FN Thomson Reuters Web of Science™
VR 1.0
PT J
AU White, TJ
Bunning, TJ
Tabiryan, NV
AF White, Timothy J.
Bunning, Timothy J.
Tabiryan, Nelson V.
TI Photosensitive polymer/liquid crystal mixtures
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Spring Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [White, Timothy J.; Bunning, Timothy J.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
[Tabiryan, Nelson V.] Beam Engn Adv Measurements Co, Winter Pk, FL USA.
EM timothy.bunning@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 1
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 225-PMSE
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 216SF
UT WOS:000324303604165
ER
PT J
AU Young, AM
Eigenbrodt, B
Serge, C
Reitz, T
Howell, T
AF Young, Anthony M.
Eigenbrodt, Bryan
Serge, Carlo
Reitz, Thomas
Howell, Thomas
TI X-ray absorption spectroscopy investigating the redox chemistry of
Sr-2(Mg1-xNix)MoO6 solid oxide fuel cell anode materials
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Spring Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Young, Anthony M.; Eigenbrodt, Bryan; Reitz, Thomas; Howell, Thomas] Air Force Res Lab, WPAFB, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
[Eigenbrodt, Bryan] Natl Acad Sci, Res Associateship Program, Washington, DC 20001 USA.
[Serge, Carlo] IIT, Dept Phys, Chicago, IL 60616 USA.
EM anthony.young@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 848-INOR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 216SF
UT WOS:000324303601935
ER
PT J
AU Butcher, DP
Yen, CW
Durstock, M
Tabor, C
Wadams, RC
Fabris, L
AF Butcher, Dennis P.
Yen, Chun-wan
Durstock, Michael
Tabor, Christopher
Wadams, Robert C.
Fabris, Laura
TI Improved light-harvesting in organic solar cells with plasmonic
nanoparticles in the active layer
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Butcher, Dennis P.; Yen, Chun-wan; Durstock, Michael; Tabor, Christopher] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Wadams, Robert C.; Fabris, Laura] Rutgers State Univ, Piscataway, NJ 08854 USA.
EM dennis.butcher.ctr@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 495-COLL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 210RD
UT WOS:000323851303965
ER
PT J
AU Eigenbrodt, BC
Young, AM
Howell, TG
Segre, CU
Thomas, RL
AF Eigenbrodt, Bryan C.
Young, Anthony M.
Howell, Thomas G.
Segre, Carlo U.
Thomas, Reitz L.
TI High temperature, in situ X-ray absorption spectroscopy study of the
redox chemistry of Sr2MgMoO6 solid oxide fuel cell anode material
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Eigenbrodt, Bryan C.] Natl Acad Sci, Res Associateship Programs, Washington, DC 20001 USA.
[Eigenbrodt, Bryan C.; Young, Anthony M.; Howell, Thomas G.; Thomas, Reitz L.] Air Force Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
[Segre, Carlo U.] IIT, Dept Biol Chem & Phys Sci, Chicago, IL 60616 USA.
[Segre, Carlo U.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
EM beigenbr@gmail.com
RI Segre, Carlo/B-1548-2009
OI Segre, Carlo/0000-0001-7664-1574
NR 0
TC 0
Z9 0
U1 0
U2 4
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 825-ENFL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 210RD
UT WOS:000323851305221
ER
PT J
AU Liu, CH
Pandey, R
Carna, S
Hussain, S
AF Liu, Chinhui
Pandey, Ravindra
Carna, Shashi
Hussain, Saber
TI Modeling of lipid bilayers using first principles method
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Liu, Chinhui; Pandey, Ravindra] Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA.
[Carna, Shashi] US Army Res Lab, Weap & Mat Res Directorate, Aberdeen Proving Ground, MD 21005 USA.
[Hussain, Saber] US Air Force Res Lab, HEPB, Dayton, OH 45433 USA.
EM chinliu@mtu.edu
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 74-ENVR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 210RD
UT WOS:000323851305298
ER
PT J
AU Miller, HA
Levisky, JA
Jenkins, WW
Iacono, ST
Corley, CW
AF Miller, Hannah A.
Levisky, Joseph A.
Jenkins, Werner W.
Iacono, Scott T.
Corley, Cynthia W.
TI Isotopic dilutions of mulitple labeled drug analogs of methamphetamine
by time-of-flight mass spectrometry
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Miller, Hannah A.; Levisky, Joseph A.; Iacono, Scott T.; Corley, Cynthia W.] USAF Acad, Chem Res Ctr, Dept Chem, Colorado Springs, CO 80840 USA.
[Jenkins, Werner W.] El Paso Cty Coroners Off, Colorado Springs, CO 80906 USA.
EM hannah.miller.ctr@usafa.edu
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 80-ANYL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 210RD
UT WOS:000323851300594
ER
PT J
AU Patel, A
Guliants, EA
Bunker, CE
Jelliss, PA
Buckner, SW
AF Patel, Ashish
Guliants, Elena A.
Bunker, Christopher E.
Jelliss, Paul A.
Buckner, Steve W.
TI Production of air-stable aluminum nanoparticles using polyesters as
capping agents
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Patel, Ashish; Jelliss, Paul A.; Buckner, Steve W.] St Louis Univ, Dept Chem, St Louis, MO 63103 USA.
[Bunker, Christopher E.] Air Force Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
[Guliants, Elena A.] Univ Dayton, Res Inst, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
EM apatel90@slu.edu
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 536-ENFL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 210RD
UT WOS:000323851304944
ER
PT J
AU Song, CK
White, A
Zeng, L
Leever, BJ
Clark, MD
Emery, JD
Lou, SJ
Chen, LX
Bedzyk, MJ
Marks, TJ
AF Song, Charles K.
White, Alicia
Zeng, Li
Leever, Benjamin J.
Clark, Michael D.
Emery, Jonathan D.
Lou, Sylvia J.
Chen, Lin X.
Bedzyk, Michael J.
Marks, Tobin J.
TI Modulating charge transport kinetics of bulk-heterojunction organic
photovoltaics via the qddition of dipolar monolayer at the electrode
surface
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Song, Charles K.; Lou, Sylvia J.; Chen, Lin X.; Marks, Tobin J.] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA.
[White, Alicia] Northwestern Univ, Weinberg Coll Arts & Sci, Evanston, IL 60208 USA.
[Zeng, Li; Bedzyk, Michael J.] Northwestern Univ, Grad Program Appl Phys, Evanston, IL 60208 USA.
[Leever, Benjamin J.; Clark, Michael D.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Emery, Jonathan D.; Bedzyk, Michael J.; Marks, Tobin J.] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA.
EM charles.song@u.northwestern.edu
RI Bedzyk, Michael/K-6903-2013; Bedzyk, Michael/B-7503-2009
NR 0
TC 0
Z9 0
U1 0
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 3-ENFL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 210RD
UT WOS:000323851304458
ER
PT J
AU Thomas, BJ
Guliants, EA
Bunker, CE
Jelliss, PA
Buckner, SW
AF Thomas, Brandon J.
Guliants, Elena A.
Bunker, Christopher E.
Jelliss, Paul A.
Buckner, Steven W.
TI Aluminum nanoparticle stabilization: Polymerization initiation by
electron-rich metallic nanoparticles (PIERMEN)
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Thomas, Brandon J.; Jelliss, Paul A.; Buckner, Steven W.] St Louis Univ, Dept Chem, St Louis, MO 63103 USA.
[Bunker, Christopher E.] Air Force Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
[Guliants, Elena A.] Univ Dayton, Res Inst, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
EM bthoma21@slu.edu
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 320-ENFL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 210RD
UT WOS:000323851304745
ER
PT J
AU Vernon, JP
Serak, SV
Hrozhyk, UA
Tondiglia, VP
White, TJ
Tabiryan, NV
Bunning, TJ
AF Vernon, Jonathan P.
Serak, Svetlana V.
Hrozhyk, Uladzimir A.
Tondiglia, Vincent P.
White, Timothy J.
Tabiryan, Nelson V.
Bunning, Timothy J.
TI Optically reconfigurable media enabled by photosensitive surfaces
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 245th National Meeting of the American-Chemical-Society (ACS)
CY APR 07-11, 2013
CL New Orleans, LA
SP Amer Chem Soc
C1 [Vernon, Jonathan P.; Tondiglia, Vincent P.; White, Timothy J.; Bunning, Timothy J.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Vernon, Jonathan P.] Azimuth Corp, Dayton, OH 45432 USA.
[Serak, Svetlana V.; Hrozhyk, Uladzimir A.; Tabiryan, Nelson V.] Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
[Tondiglia, Vincent P.] SAIC Inc, Dayton, OH 45431 USA.
EM jonathan.vernon.ctr@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 1
U2 4
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD APR 7
PY 2013
VL 245
MA 179-COLL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 210RD
UT WOS:000323851303830
ER
PT J
AU Xue, CM
Birel, O
Xue, YH
Dai, LM
Urbas, A
Li, Q
AF Xue, Chenming
Birel, Ozgul
Xue, Yuhua
Dai, Liming
Urbas, Augustine
Li, Quan
TI pH and Temperature Modulated Aggregation of Hydrophilic Gold Nanorods
with Perylene Dyes and Carbon Nanotubes
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID NANOPARTICLES; MOLECULES; YIELD
AB Hydrophilic mercaptosuccinic acid (MSA) monolayer-protected gold nanorods (GNRs) were synthesized. The resulting GNRs encapsulated with biocompatible MSA molecules via covalent Au-S linkages were found to be able to self-aggregate through intermolecular hydrogen bonding. Interestingly, when the hybrid GNRs (MSA-GNR) were mixed with the hydrophilic fluorescent perylene diimide (PDI) molecules and carboxylic acid modified single-wall carbon nanotubes (CNT-COOH), respectively, their aggregation behaviors were pH- and temperature-dependent, which were investigated by UV-vis, fluorescence spectra, and TEM images. The aggregates of MSA-GNR with functional PDI and CNT-COOH were able to combine the properties of each component through noncovalent interactions, providing insight into developing new multifunctional metal nanocomposites with properties tailored for their practical application.
C1 [Xue, Chenming; Birel, Ozgul; Li, Quan] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA.
[Birel, Ozgul] Mugla Univ, Dept Chem, TR-48121 Mugla, Turkey.
[Xue, Yuhua; Dai, Liming] Case Western Reserve Univ, Cleveland, OH 44106 USA.
[Urbas, Augustine] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Xue, CM (reprint author), Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA.
FU Air Force Office of Scientific Research [AFOSR FA9550-09-1-0254];
AFOSR-MURI [FA9550-12-1-0037]; TUBITAK from Turkey [2219]
FX This work was supported by the Air Force Office of Scientific Research
(Grant AFOSR FA9550-09-1-0254). Support from AFOSR-MURI (Grant
FA9550-12-1-0037) and TUBITAK (Grant 2219) from Turkey is also
acknowledged. The TEM data were obtained with assistance from Min Gao at
the (cryo) TEM facility at the Liquid Crystal Institute, Kent State
University, OH, supported by the Ohio Research Scholars Program Research
Cluster on Surfaces in Advanced Materials.
NR 29
TC 5
Z9 5
U1 1
U2 52
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD APR 4
PY 2013
VL 117
IS 13
BP 6752
EP 6758
DI 10.1021/jp400788h
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 122KS
UT WOS:000317317600031
ER
PT J
AU Iurov, A
Gumbs, G
Roslyak, O
Huang, D
AF Iurov, Andrii
Gumbs, Godfrey
Roslyak, Oleksiy
Huang, Danhong
TI Photon dressed electronic states in topological insulators: tunneling
and conductance
SO JOURNAL OF PHYSICS-CONDENSED MATTER
LA English
DT Article
ID GRAPHENE
AB We have obtained analytic results for the surface states of three-dimensional topological insulators in the presence of circularly polarized light. This electron-photon interaction results in an energy gap as well as a novel energy dispersion of the dressed electron-photon states, different from both graphene and the standard two-dimensional electron gas (2DEG). Additionally, we made calculations of the ballistic conductance and Klein tunneling in both two- and three-dimensional topological insulators as well as investigating how these phenomena are affected in the presence of circularly polarized light. We have found a critical energy for an incoming particle, separating two substantially different types of tunneling.
C1 [Iurov, Andrii; Gumbs, Godfrey; Roslyak, Oleksiy] CUNY, Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA.
[Gumbs, Godfrey] Donostia Int Phys Ctr DIPC, E-20018 San Sebastian, Basque Country, Spain.
[Huang, Danhong] USAF, Res Lab ARFL RVSS, Kirtland AFB, NM 87117 USA.
RP Iurov, A (reprint author), CUNY, Hunter Coll, Dept Phys & Astron, 695 Pk Ave, New York, NY 10065 USA.
EM aiurov@hunter.cuny.edu
RI DONOSTIA INTERNATIONAL PHYSICS CTR., DIPC/C-3171-2014
FU AFRL [FA 9453-11-01-0263]; Air Force Office of Scientific Research
(AFOSR)
FX This research was supported by contract # FA 9453-11-01-0263 of AFRL. DH
would like to thank the Air Force Office of Scientific Research (AFOSR)
for its support. The authors also acknowledge considerable contribution
and helpful discussions with Liubov Zhemchuzhna.
NR 29
TC 7
Z9 7
U1 1
U2 17
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-8984
EI 1361-648X
J9 J PHYS-CONDENS MAT
JI J. Phys.-Condes. Matter
PD APR 3
PY 2013
VL 25
IS 13
AR 135502
DI 10.1088/0953-8984/25/13/135502
PG 13
WC Physics, Condensed Matter
SC Physics
GA 104KX
UT WOS:000315992900013
PM 23462425
ER
PT J
AU Patnaik, AK
Roy, S
Gord, JR
AF Patnaik, Anil K.
Roy, Sukesh
Gord, James R.
TI Saturation of vibrational coherent anti-Stokes Raman scattering mediated
by saturation of the rotational Raman transition
SO PHYSICAL REVIEW A
LA English
DT Article
ID FEMTOSECOND LASER-PULSES; POLARIZATION SPECTROSCOPY; GAS-BREAKDOWN;
LINE-SHAPES; NITROGEN; CARS; COEFFICIENTS; THERMOMETRY; INTENSITIES;
PUMP
AB Saturation of vibrational Raman coherence and coherent anti-Stokes Raman scattering (CARS) using femtosecond (fs) excitation pulses is investigated theoretically. The pump in a typical fs-CARS configuration has a bandwidth of a few hundred cm(-1) that can couple tens of rotational states of room-air nitrogen molecules simultaneously, unlike in CARS with longer pulse durations. It is demonstrated that the vibrational coherence and also the vibrational CARS with fs excitation display saturationlike behavior once the rotational coherence is saturated. The Raman saturation threshold for the fs pump is numerically estimated to be at a peak intensity of similar to 10(22) W/m(2), which is six to seven orders of magnitude higher than that in the nanosecond regime. The results are compared with the known saturation thresholds in different pulse-duration regimes and placed in perspective with other nonlinear thresholds reported in fs excitation regimes. DOI: 10.1103/PhysRevA.87.043801
C1 [Patnaik, Anil K.; Gord, James R.] USAF, Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
[Patnaik, Anil K.] Wright State Univ, Dept Phys, Dayton, OH 45435 USA.
[Roy, Sukesh] Spectral Energies LLC, Dayton, OH 45431 USA.
RP Patnaik, AK (reprint author), USAF, Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
EM anil.patnaik@wpafb.af.mil
FU US Air Force Research Laboratory [F33615-03-D-2329, FA8650-10-C-2008];
US Air Force Office of Scientific Research
FX Funding for this study was provided by the US Air Force Research
Laboratory (Contracts No. F33615-03-D-2329 and No. FA8650-10-C-2008) and
the US Air Force Office of Scientific Research. This manuscript has been
cleared for public release (No. 88ABW-2012-6541). The authors would like
to thank Dr. Alan Eckbreth for inspiring this work through stimulating
discussions.
NR 48
TC 5
Z9 5
U1 0
U2 23
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1050-2947
J9 PHYS REV A
JI Phys. Rev. A
PD APR 2
PY 2013
VL 87
IS 4
AR 043801
DI 10.1103/PhysRevA.87.043801
PG 9
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 117IL
UT WOS:000316946700003
ER
PT J
AU Murray, V
Llamocca, D
Lyke, J
Avery, K
Jiang, YB
Pattichis, M
AF Murray, Victor
Llamocca, Daniel
Lyke, James
Avery, Keith
Jiang, Yuebing
Pattichis, Marios
TI Cell-Based Architecture for Adaptive Wiring Panels: A First Prototype
SO JOURNAL OF AEROSPACE INFORMATION SYSTEMS
LA English
DT Article
AB We present a first prototype for developing the concept of a manifold of adaptive wiring cells connected as a single overall adaptive wiring panel. The main use of the adaptive wiring panel is related to affordable plug-and-play space applications. A reconfigurable switch fabric enables dynamic routing of signals and power; thus, power, digital, and analog signals can be routed for space systems. This concept can also be applied to terrestrial applications such as aircraft wiring and ground-based systems. The adaptive wiring panel is a manifold of adaptive wiring cells cast as a single overall panel. The panel is a pegboard-like structure, which does not articulate specific sockets, but rather provides a continuous grid of contact pads and mechanical mounting holes. Implementation is based on three basic elements: 1) cell units, which are minimum independent units of the adaptive wiring panel, each with interconnections and links with other cells to form the switch fabric by which we wire components to each other; 2) a cell management unit, which talks independently with all cell units and manages the wiring path and panel switch connections; and 3) modules that provide the components to be wired.
C1 [Murray, Victor; Llamocca, Daniel; Jiang, Yuebing; Pattichis, Marios] Univ New Mexico, Dept Elect & Comp Engn, Albuquerque, NM 87131 USA.
[Lyke, James; Avery, Keith] US Air Force Res Lab, Space Vehicles Directorate, Albuquerque, NM 87112 USA.
RP Murray, V (reprint author), Univ Ingn & Tecnol, Dept Elect Engn & Automat, Av Cascanueces 2281, Lima 48, Peru.
OI Llamocca, Daniel/0000-0003-1301-3655
NR 24
TC 3
Z9 3
U1 0
U2 1
PU AMER INST AERONAUTICS ASTRONAUTICS
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 1940-3151
EI 2327-3097
J9 J AEROSP INFORM SYST
JI J. Aerosp. Inf. Syst.
PD APR
PY 2013
VL 10
IS 4
BP 187
EP 208
DI 10.2514/1.I010024
PG 22
WC Engineering, Aerospace
SC Engineering
GA AB2FM
UT WOS:000331608600003
ER
PT J
AU Trocha-Van Nort, A
AF Trocha-Van Nort, Andrea
TI Want of Speech in RICHARD II
SO EXPLICATOR
LA English
DT Article
DE King Richard II; metaphor; retributive punishment; Richard II; William
Shakespeare; torture
C1 US Air Force Acad, Colorado Springs, CO 80840 USA.
RP Trocha-Van Nort, A (reprint author), US Air Force Acad, Colorado Springs, CO 80840 USA.
NR 9
TC 0
Z9 0
U1 0
U2 0
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 0014-4940
EI 1939-926X
J9 EXPLICATOR
JI Explicator
PD APR 1
PY 2013
VL 71
IS 2
BP 127
EP 130
DI 10.1080/00144940.2013.781006
PG 4
WC Literature
SC Literature
GA 159BY
UT WOS:000320020200013
ER
PT J
AU Kwon, Y
Narayanan, RM
Rangaswamy, M
AF Kwon, Yangsoo
Narayanan, Ram M.
Rangaswamy, Muralidhar
TI Target detection and reconstruction for compressive multiple-input,
multiple-output ultra-wideband noise radar imaging
SO JOURNAL OF ELECTRONIC IMAGING
LA English
DT Article
ID ATOMIC DECOMPOSITION; PRINCIPLES; DESIGN
AB We propose a sample selection method for multiple-input, multiple-output ultra-wideband noise radar imaging using compressive sensing. The proposed sample selection is based on comparing the norm values of candidates among the potential received signal and selecting the largest M samples among N per antenna to obtain selection diversity. Moreover, we propose an adaptive weighting allocation that improves reconstruction accuracy of compressive sensing by maximizing the mutual information between target echoes and transmitted signals. This weighting scheme is applicable to both sample selection schemes, a conventional random sampling and the proposed selection. Further, the weighting allocation with the knowledge of recovery error is proposed for more practical scenarios. Simulations show that the proposed selection and weighting allocation enhance multiple target detection probability and reduce normalized mean square error. (c) 2013 SPIE and IS&T
C1 [Kwon, Yangsoo; Narayanan, Ram M.] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
[Rangaswamy, Muralidhar] Air Force Res Lab, Code RYAP, Wright Patterson AFB, OH 45433 USA.
RP Kwon, Y (reprint author), Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
EM ram@engr.psu.edu
FU Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0605]
FX The research is supported by Air Force Office of Scientific Research
(AFOSR) Contract #FA9550-09-1-0605. We appreciate valuable comments
provided by Dr. Jon Sjogren of AFOSR.
NR 18
TC 0
Z9 0
U1 1
U2 7
PU IS&T & SPIE
PI BELLINGHAM
PA 1000 20TH ST, BELLINGHAM, WA 98225 USA
SN 1017-9909
J9 J ELECTRON IMAGING
JI J. Electron. Imaging
PD APR-JUN
PY 2013
VL 22
IS 2
AR 021008
DI 10.1117/1.JEI.22.2.021008
PG 16
WC Engineering, Electrical & Electronic; Optics; Imaging Science &
Photographic Technology
SC Engineering; Optics; Imaging Science & Photographic Technology
GA 190XF
UT WOS:000322376100009
ER
PT J
AU Eismann, MT
LeMaster, DA
AF Eismann, Michael T.
LeMaster, Daniel A.
TI Aerosol modulation transfer function model for passive long-range
imaging over a nonuniform atmospheric path
SO OPTICAL ENGINEERING
LA English
DT Article
DE aerosol scattering; modulation transfer function; remote sensing;
atmospheric modeling; adjacency effect
ID POINT-SPREAD FUNCTION; RESOLUTION
AB An aerosol modulation transfer function (MTF) model is developed to assess the impact of aerosol scattering on passive long-range imaging sensors. The methodology extends from previous work to explicitly address imaging scenarios with a nonuniform distribution of scattering characteristics over the propagation path and incorporates the moderate resolution transfer code database of aerosol cross-section and phase function characteristics in order to provide an empirical foundation for realistic quantitative MTF assessments. The resulting model is compared with both predictions from a Monte-Carlo scattering simulation and a scene-derived MTF estimate from an empirical image, with reasonable agreement in both cases. Application to long-range imaging situations at both visible and infrared wavelengths indicates that the magnitude and functional form of the aerosol MTF differ significantly from other contributors to the composite system MTF. Furthermore, the image-quality impact is largely radiometric in the sense that the contrast reduction is approximately independent of spatial frequency, and image blur is practically negligible. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
C1 [Eismann, Michael T.; LeMaster, Daniel A.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Eismann, MT (reprint author), USAF, Res Lab, 2241 Avion Circle, Wright Patterson AFB, OH 45433 USA.
EM michael.eismann@wpafb.af.mil
NR 31
TC 6
Z9 6
U1 0
U2 6
PU SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA
SN 0091-3286
J9 OPT ENG
JI Opt. Eng.
PD APR
PY 2013
VL 52
IS 4
AR 046201
DI 10.1117/1.OE.52.4.046201
PG 13
WC Optics
SC Optics
GA 151DB
UT WOS:000319439700051
ER
PT J
AU Nair, NV
Pray, AJ
Villa-Giron, J
Shanker, B
Wilton, DR
AF Nair, N. V.
Pray, A. J.
Villa-Giron, J.
Shanker, B.
Wilton, D. R.
TI A Singularity Cancellation Technique for Weakly Singular Integrals on
Higher Order Surface Descriptions
SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
LA English
DT Article
DE Near singularity; singular quadrature; singularity cancellation
ID NUMERICAL EVALUATION; POTENTIAL INTEGRALS; POLYHEDRAL DOMAINS; EQUATION
METHODS; QUADRATURE; KERNELS
AB Accurate integration of singular and near-singular functions is critical to the accuracy of the method of moments solution to surface integral equations. While this problem has been widely addressed for flat geometries, its extensions to higher order surface descriptions have been limited. This letter provides a systematic prescription for the application of the rules for weakly singular integrals on higher order surfaces. Here, we present implementation details and several demonstrative results that compare the accuracy and convergence of the integration rules.
C1 [Nair, N. V.; Pray, A. J.; Shanker, B.] Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA.
[Villa-Giron, J.] AFRL, Wright Patterson AFB, OH 45433 USA.
[Shanker, B.] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA.
[Wilton, D. R.] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA.
RP Nair, NV (reprint author), Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA.
EM nairn@msu.edu
FU NSF [DMS 0811197, CCF 1018516]; AFRL [FA8650-09-C-1619]; DoD SMART
Fellowship [N00244-09-1-0081]
FX This work was supported by the NSF via DMS 0811197 and CCF 1018516, and
AFRL via FA8650-09-C-1619. The work of A. J. Pray was supported by DoD
SMART Fellowship N00244-09-1-0081.
NR 25
TC 3
Z9 3
U1 0
U2 4
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-926X
J9 IEEE T ANTENN PROPAG
JI IEEE Trans. Antennas Propag.
PD APR
PY 2013
VL 61
IS 4
BP 2347
EP 2352
DI 10.1109/TAP.2013.2238880
PN 2
PG 7
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA 156OB
UT WOS:000319830800061
ER
PT J
AU Santana, JAC
Young, CM
McClory, JW
Petrosky, JC
Wang, X
Liu, P
Tang, JK
Adamiv, VT
Burak, YV
Fukutani, K
Dowben, PA
AF Santana, Juan A. Colon
Young, C. M.
McClory, J. W.
Petrosky, J. C.
Wang, X.
Liu, P.
Tang, Jinke
Adamiv, V. T.
Burak, Ya V.
Fukutani, Keisuke
Dowben, P. A.
TI Gamma and X-ray sensitivity of Gd2O3 heterojunctions
SO RADIATION MEASUREMENTS
LA English
DT Article
DE Oxide dielectric layers; Gd doping; Neutron detection
ID NEUTRON-CAPTURE; GADOLINIUM; DETECTORS; STATES
AB We find that Gd2O3 thin films strongly favor a (-402) texture growth on a variety of substrates and will form heterojunction diodes with silicon, especially when doped with oxygen vacancies. Even in the thin film limit, these heterojunction diodes appear to be sensitive to gamma radiation, likely from the X-rays created by scattering events, adding to the numerous hurdles that must be overcome if Gd based semiconductor devices are to be used for solid state neutron detection applications. (C) 2013 Elsevier Ltd. All rights reserved.
C1 [Santana, Juan A. Colon] Univ Nebraska, Coll Engn & Technol, Nebraska Ctr Mat & Nanosci, Walter Scott Engn Ctr, Lincoln, NE 68588 USA.
[Young, C. M.; McClory, J. W.; Petrosky, J. C.] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
[Wang, X.; Liu, P.; Tang, Jinke] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA.
[Adamiv, V. T.; Burak, Ya V.] Inst Phys Opt, UA-79005 Lvov, Ukraine.
[Fukutani, Keisuke; Dowben, P. A.] Univ Nebraska, Dept Phys & Astron, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA.
RP Dowben, PA (reprint author), Univ Nebraska, Dept Phys & Astron, Nebraska Ctr Mat & Nanosci, Theodore Jorgensen Hall,855 North 16th St,POB 880, Lincoln, NE 68588 USA.
EM juan.colon.santana@gmail.com; John.McClory@afit.edu;
james.petrosky@afit.edu; xianjiewanghit@yahoo.com.cn; jtang2@uwyo.edu;
adamiv@ifo.lviv.ua; burak@ifo.lviv.ua; nekocat@unl.edu; pdowben1@unl.edu
RI Liu, Pan/P-2625-2016;
OI Liu, Pan/0000-0002-4287-1395; McClory, John/0000-0002-4303-2729
FU Defense Threat Reduction Agency [HDTRA1-07-1-0008]; Department of
Homeland Security [IAA:HSHQDC-08-X-00641/P00001]
FX The authors would like acknowledge key discussions with Glenn F. Knoll,
Anthony Caruso, and Abigail A. Bickley. This work was supported by the
Defense Threat Reduction Agency (Grant No. HDTRA1-07-1-0008) and the
Department of Homeland Security (IAA:HSHQDC-08-X-00641/P00001). The
views expressed in this article are those of the authors and do not
reflect the official policy or position of the Air Force, Department of
Defense or the U.S. Government.
NR 21
TC 1
Z9 1
U1 1
U2 7
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1350-4487
J9 RADIAT MEAS
JI Radiat. Meas.
PD APR-MAY
PY 2013
VL 51-52
BP 99
EP 102
DI 10.1016/j.radmeas.2013.02.021
PG 4
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 160XB
UT WOS:000320152700015
ER
PT J
AU Cushen, SE
Turkyilmaz, I
AF Cushen, Sarra E.
Turkyilmaz, Ilser
TI IMPACT OF OPERATOR EXPERIENCE ON THE ACCURACY OF IMPLANT PLACEMENT WITH
STEREOLITHOGRAPHIC SURGICAL TEMPLATES: AN IN VITRO STUDY
SO JOURNAL OF PROSTHETIC DENTISTRY
LA English
DT Article
ID COMPUTED-TOMOGRAPHY; ORAL IMPLANTS; GUIDES; SURGERY; SURVIVAL; IMAGES
AB Statement of problem. To achieve functional and esthetic results, implants must be placed accurately. However, little information relating to the effect of operator experience on implant placement accuracy is available.
Purpose. The objective of this investigation was to measure the accuracy of dental implant placement with a bone-supported stereolithographic surgical template created from a virtual implant plan and to determine the effect of operator experience on implant placement accuracy.
Material and methods. Twenty photopolymer resin edentulous mandibles were scanned with cone beam computerized tomography (CBCT). Five implants were planned virtually for each mandible, and a stereolithographic surgical template was made. Four operators placed a total of 100 implants (25 per operator). Two of the operators were experienced in implant placement and 2 operators had limited prior implant placement experience. A CBCT scan of the postimplant placement mandibles was performed, and the images were superimposed on the preimplant placement images containing the virtual implant plans. The amount of angular, horizontal, and vertical deviation of the placed implants from the virtually planned implants at the apex and platform was calculated, and statistically significant differences were detected between the operator groups by using a multivariate analysis of variance (MANOVA) (alpha=.05).
Results. For the experienced operators, the mean error of angular deviation was 2.60 +/- 1.25 degrees, of horizontal deviation at the apex 0.34 +/- 0.15 mm, of horizontal deviation at the platform 0.63 +/- 0.28 mm, of vertical deviation at the apex 0.59 +/- 0.12 mm, and of vertical deviation at the platform 0.16 +/- 0.11 mm. For the inexperienced group, the mean error of angular deviation was 3.96 +/- 1.64 degrees, of horizontal deviation at the apex 0.42 +/- 0.19 mm, of horizontal deviation at the platform 0.77 +/- 0.33 mm, ofvertical deviation at the apex 0.62 +/- 0.13 mm, and of vertical deviation at the platform 0.15 0.11 mm. The MANOVA showed a statistically significant difference between the experienced and inexperienced groups for angular and horizontal error at the implant apex and platform (P<.05).
Conclusions. The results of this in vitro investigation revealed that the experience level of the operator placing the implants contributes to the accuracy of implant placement, with more experienced operators placing more implants accurately.
C1 [Cushen, Sarra E.] USAF, Wilford Hall Med Ctr, Lackland AFB, San Antonio, TX USA.
[Turkyilmaz, Ilser] Univ Texas Hlth Sci Ctr San Antonio, Dent Sch Implant Clin, Dept Comprehens Dent, San Antonio, TX 78229 USA.
RP Turkyilmaz, I (reprint author), Univ Texas Hlth Sci Ctr San Antonio, Dent Sch Implant Clin, Dept Comprehens Dent, 7703 Floyd Curl Dr,MSC 7914, San Antonio, TX 78229 USA.
EM turkyilmaz@uthscsa.edu
NR 44
TC 12
Z9 13
U1 2
U2 10
PU MOSBY-ELSEVIER
PI NEW YORK
PA 360 PARK AVENUE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0022-3913
EI 1097-6841
J9 J PROSTHET DENT
JI J. Prosthet. Dent.
PD APR
PY 2013
VL 109
IS 4
BP 248
EP 254
PG 7
WC Dentistry, Oral Surgery & Medicine
SC Dentistry, Oral Surgery & Medicine
GA 153WA
UT WOS:000319632000008
PM 23566606
ER
PT J
AU Thibault, L
Avitabile, P
Foley, J
Wolfson, J
AF Thibault, Louis
Avitabile, Peter
Foley, Jason
Wolfson, Janet
TI Equivalent reduced model technique development for nonlinear system
dynamic response
SO MECHANICAL SYSTEMS AND SIGNAL PROCESSING
LA English
DT Article
DE Nonlinear analysis; Forced nonlinear response; Linear components for
nonlinear analysis; Modal analysis; Reduced order modeling
ID MODAL SUPERPOSITION; REDUCTION
AB The dynamic response of structural systems commonly involves nonlinear effects. Often times, structural systems are made up of several components, whose individual behavior is essentially linear compared to the total assembled system. However, the assembly of linear components using highly nonlinear connection elements or contact regions causes the entire system to become nonlinear. Conventional transient nonlinear integration of the equations of motion can be extremely computationally intensive, especially when the finite element models describing the components are very large and detailed.
In this work, the equivalent reduced model technique (ERMT) is developed to address complicated nonlinear contact problems. ERMT utilizes a highly accurate model reduction scheme, the System equivalent reduction expansion process (SEREP). Extremely reduced order models that provide dynamic characteristics of linear components, which are interconnected with highly nonlinear connection elements, are formulated with SEREP for the dynamic response evaluation using direct integration techniques. The full-space solution will be compared to the response obtained using drastically reduced models to make evident the usefulness of the technique for a variety of analytical cases. (C) 2012 Elsevier Ltd. All rights reserved.
C1 [Thibault, Louis; Avitabile, Peter] Univ Massachusetts Lowell, Struct Dynam & Acoust Syst Lab, Lowell, MA 01854 USA.
[Foley, Jason; Wolfson, Janet] USAF, Munit Directorate, Fuzes Branch, Eglin AFB, FL 32542 USA.
RP Thibault, L (reprint author), Univ Massachusetts Lowell, Struct Dynam & Acoust Syst Lab, 1 Univ Ave, Lowell, MA 01854 USA.
EM louishthibault@gmail.com
FU Air Force Research Laboratory [FA8651-10-1-0009]
FX Some of the work presented herein was partially funded by Air Force
Research Laboratory Award No. FA8651-10-1-0009 "Development of Dynamic
Response Modeling Techniques for Linear Modal Components". Any opinions,
findings, and conclusions or recommendations expressed in this material
are those of the authors and do not necessarily reflect the views of the
particular funding agency. The authors are grateful for the support
obtained.
NR 28
TC 7
Z9 7
U1 0
U2 12
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0888-3270
J9 MECH SYST SIGNAL PR
JI Mech. Syst. Signal Proc.
PD APR
PY 2013
VL 36
IS 2
BP 422
EP 455
DI 10.1016/j.ymssp.2012.07.013
PG 34
WC Engineering, Mechanical
SC Engineering
GA 149EP
UT WOS:000319302100012
ER
PT J
AU Rao, SI
Dimiduk, DM
Parthasarathy, TA
Uchic, MD
Woodward, C
AF Rao, S. I.
Dimiduk, D. M.
Parthasarathy, T. A.
Uchic, M. D.
Woodward, C.
TI Atomistic simulations of surface cross-slip nucleation in face-centered
cubic nickel and copper
SO ACTA MATERIALIA
LA English
DT Article
DE Surface cross-slip; Atomistic simulations; Embedded atom potentials;
Nickel; Copper
ID SCREW DISLOCATION INTERSECTIONS; ELASTIC BAND METHOD; MULTIPLICATION;
DEPENDENCE; FOILS; GOLD
AB In this manuscript, embedded atom potentials are used to determine the various core structures of glide screw-character dislocations intersecting free surfaces at right and inclined angles in face-centered cubic Ni and Cu. It is shown that the negative constriction forms at free surfaces under certain conditions. The role of various factors affecting the formation of negative constriction at the free surface, negative constriction energy, ledge annihilation and screw dislocation rotation due to Lothe's forces are discussed. The activation energy for surface cross-slip nucleation when the screw dislocation intersects the free surfaces at right angles, in the absence of ledge annihilation forces, is shown to be 0.05 eV in Ni and 0.09 eV in Cu. The activation-energy values obtained via the nudged elastic band method are significantly lower than the activation energy for cross-slip at attractive forest dislocation intersections in these materials. The present results are expected to be useful in understanding the mechanical behavior of micron-sized pillars under pure tension and compression. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Rao, S. I.; Parthasarathy, T. A.] Universal Energy Syst Inc, Dayton, OH 45432 USA.
[Dimiduk, D. M.; Uchic, M. D.; Woodward, C.] USAF, Res Lab, Mat & Mfg Directorate, AFRL MLLM, Wright Patterson AFB, OH 45433 USA.
RP Rao, SI (reprint author), Universal Energy Syst Inc, 4401 Dayton Xenia Rd, Dayton, OH 45432 USA.
EM satish.rao@wpafb.af.mil
FU AFOSR
FX The authors acknowledge use of the 3-D molecular dynamics code LAMMPS,
which was developed at Sandia National Laboratory by Dr. Steve Plimpton
and co-workers. This work was supported by the AFOSR (Dr. David
Stargel), and by a grant of computer time from the DOD High Performance
Computing Modernization Program, at the Aeronautical Systems
Center/Major Shared Resource Center. The work was performed at the US
Air Force Research Laboratory, Materials and Manufacturing Directorate,
Wright-Patterson AFB.
NR 27
TC 9
Z9 9
U1 4
U2 33
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD APR
PY 2013
VL 61
IS 7
BP 2500
EP 2508
DI 10.1016/j.actamat.2013.01.026
PG 9
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 120HQ
UT WOS:000317161800020
ER
PT J
AU Wu, QY
Quach, TK
Mattamana, A
Elabd, S
Orlando, PL
Dooley, SR
McCue, JJ
Creech, GL
Khalil, W
AF Wu, Qiyang
Quach, Tony K.
Mattamana, Aji
Elabd, Salma
Orlando, Pompei L.
Dooley, Steven R.
McCue, Jamin J.
Creech, Gregory L.
Khalil, Waleed
TI Frequency Tuning Range Extension in LC-VCOs Using Negative-Capacitance
Circuits
SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
LA English
DT Article
DE LC voltage-controlled oscillators (VCOs) (LC-VCOs); millimeter-wave
integrated circuits; negative-capacitance (NC) circuits;
wide-tuning-range VCOs
ID PHASE-LOCKED LOOP; 0.13-MU-M CMOS; TECHNOLOGY; DESIGN
AB We present an experimentally validated capacitance cancellation structure to increase the tuning range (TR) of LC voltage-controlled oscillators (VCOs) with minimal phase noise or power impact. The cancellation is based on an ultrawideband differential active negative-capacitance (NC) circuit. An NC scheme suitable for bottom-biased VCOs is analyzed and combined with a CMOS VCO to cancel the fixed capacitance in the LC tank. The NC structure is further modified to be tunable, enabling additional expansion of the VCO TR. By manipulating the quality factor (Q) of the NC tuning varactor pair, a prototype VCO achieves a maximum TR of 27% in a 130-nm technology, while dissipating 13 mA from a 0.9-V supply. The TR is the highest reported at Q-band, covering from 34.5 GHz to 45.4 GHz. Compared to the reference VCO without an NC circuit, the TR is increased by 38%. The measured worst case phase noise is -95 dBc/Hz at 1-MHz offset, and the FOMT is -184.9 dBc/Hz.
C1 [Wu, Qiyang; Elabd, Salma; McCue, Jamin J.; Creech, Gregory L.; Khalil, Waleed] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
[Quach, Tony K.; Mattamana, Aji; Orlando, Pompei L.; Dooley, Steven R.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Wu, QY (reprint author), Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
EM wuq@ece.osu.edu
FU Air Force Research Laboratory
FX This work was supported by the Air Force Research Laboratory. This brief
was recommended by Associate Editor C. H. Heng.
NR 12
TC 10
Z9 10
U1 1
U2 8
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1549-7747
J9 IEEE T CIRCUITS-II
JI IEEE Trans. Circuits Syst. II-Express Briefs
PD APR
PY 2013
VL 60
IS 4
BP 182
EP 186
DI 10.1109/TCSII.2013.2251939
PG 5
WC Engineering, Electrical & Electronic
SC Engineering
GA 139IL
UT WOS:000318575700002
ER
PT J
AU Berger, M
Levine, JA
Nonato, LG
Taubin, G
Silva, CT
AF Berger, Matthew
Levine, Joshua A.
Nonato, Luis Gustavo
Taubin, Gabriel
Silva, Claudio T.
TI A Benchmark for Surface Reconstruction
SO ACM TRANSACTIONS ON GRAPHICS
LA English
DT Article
DE Algorithms; Experimentation; Performance; Computer graphics; geometry
processing; surface reconstruction; point cloud; benchmark; indicator
function; point set surface; multilevel partition of unity
ID IMPLICIT SURFACES; INTERPOLATION; ALGORITHMS; PARTITION; MESHES; SCANS
AB We present a benchmark for the evaluation and comparison of algorithms which reconstruct a surface from point cloud data. Although a substantial amount of effort has been dedicated to the problem of surface reconstruction, a comprehensive means of evaluating this class of algorithms is noticeably absent. We propose a simple pipeline for measuring surface reconstruction algorithms, consisting of three main phases: surface modeling, sampling, and evaluation. We use implicit surfaces for modeling shapes which are capable of representing details of varying size and sharp features. From these implicit surfaces, we produce point clouds by synthetically generating range scans which resemble realistic scan data produced by an optical triangulation scanner. We validate our synthetic sampling scheme by comparing against scan data produced by a commercial optical laser scanner, where we scan a 3D-printed version of the original surface. Last, we perform evaluation by comparing the output reconstructed surface to a dense uniformly distributed sampling of the implicit surface. We decompose our benchmark into two distinct sets of experiments. The first set of experiments measures reconstruction against point clouds of complex shapes sampled under a wide variety of conditions. Although these experiments are quite useful for comparison, they lack a fine-grain analysis. To complement this, the second set of experiments measures specific properties of surface reconstruction, in terms of sampling characteristics and surface features. Together, these experiments depict a detailed examination of the state of surface reconstruction algorithms.
C1 [Berger, Matthew] USAF, Res Lab, Informat Directorate, Wright Patterson AFB, OH 45433 USA.
[Levine, Joshua A.] Clemson Univ, Clemson, SC 29631 USA.
[Nonato, Luis Gustavo] Univ Sao Paulo, BR-05508 Sao Paulo, Brazil.
[Taubin, Gabriel] Brown Univ, Providence, RI 02912 USA.
[Silva, Claudio T.] NYU, Polytech Inst, New York, NY 10003 USA.
RP Berger, M (reprint author), USAF, Res Lab, Informat Directorate, Wright Patterson AFB, OH 45433 USA.
EM bergerm@cs.utah.edu
RI Nonato, Luis Gustavo/D-5782-2011;
OI Taubin, Gabriel/0000-0002-1983-7607
FU National Science Foundation; Fapesp-Brazil; CNPq-NSF
FX This work was partially funded by the National Science Foundation and
grants from Fapesp-Brazil and CNPq-NSF.
NR 51
TC 10
Z9 11
U1 1
U2 21
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA
SN 0730-0301
EI 1557-7368
J9 ACM T GRAPHIC
JI ACM Trans. Graph.
PD APR
PY 2013
VL 32
IS 2
AR 20
DI 10.1145/2451236.2451246
PG 17
WC Computer Science, Software Engineering
SC Computer Science
GA 138CE
UT WOS:000318485100010
ER
PT J
AU Martin, JS
Ghahramanlou-Holloway, M
Englert, DR
Bakalar, JL
Olsen, C
Nademin, EM
Jobes, DA
Branlund, S
AF Martin, Jeffery S.
Ghahramanlou-Holloway, Marjan
Englert, David R.
Bakalar, Jennifer L.
Olsen, Cara
Nademin, Elicia M.
Jobes, David A.
Branlund, Shannon
TI Marital Status, Life Stressor Precipitants, and Communications of
Distress and Suicide Intent in a Sample of United States Air Force
Suicide Decedents
SO ARCHIVES OF SUICIDE RESEARCH
LA English
DT Article
DE Air force; marital status; military; prevention; psychological autopsy;
suicide
ID CONTROL PSYCHOLOGICAL AUTOPSY; HEALTH-SERVICE UTILIZATION; RISK-FACTORS;
EVENTS; DEATH
AB Life stressor precipitants and communications of distress and suicide intent were examined among a sample of United States Air Force (USAF) married versus unmarried suicide decedents. A total of 100 death investigations conducted by the Office of Special Investigations on active duty USAF suicides occurring between 1996 and 2006 were retrospectively reviewed. Married decedents were twice as likely 1) to have documented interpersonal conflict 24 hours prior to suicide and 2) to have communicated suicide intent to peers or professionals. Themes of distress communication for all decedents were intrapersonal (perceived stress, depression, psychological pain) and interpersonal (thwarted belongingness, rejection, loneliness). Suicide prevention programs and policies are encouraged to adapt efforts to the unique needs of married and unmarried individuals.
C1 [Martin, Jeffery S.; Ghahramanlou-Holloway, Marjan; Bakalar, Jennifer L.; Olsen, Cara; Branlund, Shannon] Uniformed Serv Univ Hlth Sci, Dept Med & Clin Psychol, Bethesda, MD 20814 USA.
[Englert, David R.] USAF, Off Special Invest, Andrews AFB, MD USA.
[Nademin, Elicia M.] Carl T Hayden VA Med Ctr, Phoenix, AZ USA.
[Jobes, David A.] Catholic Univ, Dept Psychol, Washington, DC USA.
RP Ghahramanlou-Holloway, M (reprint author), Uniformed Serv Univ Hlth Sci, Dept Med & Clin Psychol, 4301 Jones Bridge Rd,Room B3050, Bethesda, MD 20814 USA.
EM marjan.holloway@usuhs.edu
NR 28
TC 8
Z9 8
U1 1
U2 15
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 1381-1118
J9 ARCH SUICIDE RES
JI Arch. Suicide Res.
PD APR 1
PY 2013
VL 17
IS 2
BP 148
EP 160
DI 10.1080/13811118.2013.776456
PG 13
WC Psychiatry; Psychology; Psychology, Multidisciplinary
SC Psychiatry; Psychology
GA 135LD
UT WOS:000318288700005
PM 23614487
ER
PT J
AU Domonkos, MT
Amdahl, D
Camacho, JF
Coffey, SK
Degnan, JH
Delaney, R
Frese, M
Gale, D
Grabowski, TC
Gribble, R
Intrator, TP
McCullough, J
Montano, N
Robinson, PR
Wurden, G
AF Domonkos, M. T.
Amdahl, D.
Camacho, J. F.
Coffey, S. K.
Degnan, J. H.
Delaney, R.
Frese, M.
Gale, D.
Grabowski, T. C.
Gribble, R.
Intrator, T. P.
McCullough, J.
Montano, N.
Robinson, P. R.
Wurden, G.
TI Applied magnetic field design for the field reversed configuration
compression heating experiment
SO REVIEW OF SCIENTIFIC INSTRUMENTS
LA English
DT Article
ID FRX-L; LINER; FUSION; PLASMA
AB Detailed calculations of the formation, guide, and mirror applied magnetic fields in the FRC compression-heating experiment (FRCHX) were conducted using a commercially available generalized finite element solver, COMSOL Multiphysics (R). In FRCHX, an applied magnetic field forms, translates, and finally captures the FRC in the liner region sufficiently long to enable compression. Large single turn coils generate the fast magnetic fields necessary for FRC formation. Solenoidal coils produce the magnetic field for translation and capture of the FRC prior to liner implosion. Due to the limited FRC lifetime, liner implosion is initiated before the FRC is injected, and the magnetic flux that diffuses into the liner is compressed. Two-dimensional axisymmetric magnetohydrodynamic simulations using MACH2 were used to specify optimal magnetic field characteristics, and this paper describes the simulations conducted to design magnetic field coils and compression hardware for FRCHX. This paper presents the vacuum solution for the magnetic field. (C) 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4801952]
C1 [Domonkos, M. T.; Amdahl, D.; Degnan, J. H.; Delaney, R.; Grabowski, T. C.; Robinson, P. R.] USAF, Directed Energy Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
[Camacho, J. F.; Coffey, S. K.; Frese, M.] NumerEx LLC, Albuquerque, NM 87106 USA.
[Gale, D.; McCullough, J.; Montano, N.] SAIC, Albuquerque, NM 87106 USA.
[Gribble, R.; Intrator, T. P.; Wurden, G.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Domonkos, MT (reprint author), USAF, Directed Energy Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
EM AFRL/RDHPWorkflowOrgMailbox@kirtland.af.mil
RI Wurden, Glen/A-1921-2017
OI Wurden, Glen/0000-0003-2991-1484
FU U.S. Department of Energy Office of Fusion Energy Sciences
FX This work is funded by the U.S. Department of Energy Office of Fusion
Energy Sciences.
NR 10
TC 2
Z9 2
U1 0
U2 10
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0034-6748
J9 REV SCI INSTRUM
JI Rev. Sci. Instrum.
PD APR
PY 2013
VL 84
IS 4
AR 043507
DI 10.1063/1.4801952
PG 7
WC Instruments & Instrumentation; Physics, Applied
SC Instruments & Instrumentation; Physics
GA 134UQ
UT WOS:000318240900023
PM 23635196
ER
PT J
AU Kostoff, RN
Cummings, RM
AF Kostoff, Ronald N.
Cummings, Russell M.
TI Highly cited literature of high-speed compressible flow research
SO AEROSPACE SCIENCE AND TECHNOLOGY
LA English
DT Review
DE Compressible flow; High speed; Hypersonic; Supersonic; Transonic;
Ramjet; Scramjet; Computational fluid dynamics; Citation analysis;
Literature survey; Literature review
ID TURBULENT BOUNDARY-LAYER; NAVIER-STOKES EQUATIONS; HYPERBOLIC
CONSERVATION-LAWS; SUPERSONIC MIXING LAYER; STEADY TRANSONIC SHOCKS;
HYPERSONIC VISCOUS-FLOW; FINITE-ELEMENT PANELS; AIR DIFFUSION FLAMES;
BLUNT-NOSED BODIES; FREE SHEAR LAYERS
AB High-speed flow research has been sponsored and performed at differing levels of effort since the late 1800s. For example, hypersonic research has experienced numerous cycles since the 1950s, with various periods of high research activity, followed by equally long periods of very low activity. This lack of continuity in high-speed flow research has led to a situation where researchers of one "generation" often do not know what the researchers of previous "generations" have done, mainly due to large losses of institutional knowledge in government, industry, and academic organizations. Therefore, a chronically weak area in research papers, reports, and reviews is the complete identification of critical background documents that form the building blocks and intellectual heritage for modern compressible flow research. A method for systematically determining these critical references is presented in the context of its application to high-speed flow using Citation-Assisted Background, which is based on the assumption that many critical documents tend to be highly cited within the literature, although not necessarily recently. While Citation-Assisted Background is a highly systematic approach for identifying critical references, it is not a substitute for the judgement of the researchers, but rather complements their expertise. In this critical review of high-speed compressible flow, important documents have been identified using Citation-Assisted Background, but other documents have been added by the authors to enhance the picture provided by the highly-cited documents. Published by Elsevier Masson SAS.
C1 [Kostoff, Ronald N.] Georgia Inst Technol, Gainesville, VA 20155 USA.
[Cummings, Russell M.] USAF Acad, Colorado Springs, CO 80840 USA.
NR 351
TC 5
Z9 5
U1 2
U2 55
PU ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
PI PARIS
PA 23 RUE LINOIS, 75724 PARIS, FRANCE
SN 1270-9638
EI 1626-3219
J9 AEROSP SCI TECHNOL
JI Aerosp. Sci. Technol.
PD APR-MAY
PY 2013
VL 26
IS 1
BP 216
EP 234
DI 10.1016/j.ast.2012.04.006
PG 19
WC Engineering, Aerospace
SC Engineering
GA 130CJ
UT WOS:000317890000024
ER
PT J
AU Kuridze, D
Mathioudakis, M
Kowalski, AF
Keys, PH
Jess, DB
Balasubramaniam, KS
Keenan, FP
AF Kuridze, D.
Mathioudakis, M.
Kowalski, A. F.
Keys, P. H.
Jess, D. B.
Balasubramaniam, K. S.
Keenan, F. P.
TI Failed filament eruption inside a coronal mass ejection in active region
11121
SO ASTRONOMY & ASTROPHYSICS
LA English
DT Article
DE Sun: corona; Sun: flares; Sun: magnetic topology; Sun: chromosphere;
Sun: filaments, prominences; Sun: coronal mass ejections (CMEs)
ID SOLAR-FLARES; KINK INSTABILITY; INTERNAL RECONNECTION; BREAKOUT MODEL;
FLUX ROPES; LOOPS; SIGNATURES; TOPOLOGY; EVENT
AB Aims. We study the formation and evolution of a failed filament eruption observed in NOAA active region 11121 near the southeast limb on November 6, 2010.
Methods. We used a time series of SDO/AIA 304, 171, 131, 193, 335, and 94 angstrom images, SDO/HMI magnetograms, as well as ROSA and ISOON H alpha images to study the erupting active region.
Results. We identify coronal loop arcades associated with a quadrupolar magnetic configuration, and show that the expansion and cancellation of the central loop arcade system over the filament is followed by the eruption of the filament. The erupting filament reveals a clear helical twist and develops the same sign of writhe in the form of inverse gamma-shape.
Conclusions. The observations support the "magnetic breakout" process in which the eruption is triggered by quadrupolar reconnection in the corona. We propose that the formation mechanism of the inverse gamma-shape flux rope is the magnetohydrodynamic helical kink instability. The eruption has failed because of the large-scale, closed, overlying magnetic loop arcade that encloses the active region.
C1 [Kuridze, D.; Mathioudakis, M.; Keys, P. H.; Jess, D. B.; Keenan, F. P.] Queens Univ, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland.
[Kowalski, A. F.] Univ Washington, Dept Astron, Seattle, WA 98195 USA.
[Balasubramaniam, K. S.] USAF, Res Lab, Sunspot, NM 88349 USA.
[Kuridze, D.] Ilia State Univ, Abastumani Astrophys Observ, GE-0612 Tbilisi, Rep of Georgia.
[Jess, D. B.] Katholieke Univ Leuven, Dept Math, Ctr Math Plasma Astrophys, B-3001 Heverlee, Belgium.
RP Kuridze, D (reprint author), Queens Univ, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland.
EM dkuridze01@qub.ac.uk
OI Jess, David/0000-0002-9155-8039
FU Science and Technology Facilities Council (STFC); Leverhulme Trust
[F/00203/X]; Air Force Office of Scientific Research, Air Force Material
Command, USAF [FA8655-09-13085]; FWO
FX We thank an anonymous referee for many important comments and
suggestions especially on the interpretation part of our manuscript.
Observations were obtained at the National Solar Observatory, operated
by the Association of Universities for Research in Astronomy, Inc (AURA)
under agreement with the National Science Foundation. We thank the teams
of SDO/AIA and SDO/HMI for providing valuable data. This work is
supported by the Science and Technology Facilities Council (STFC). This
work has been supported by the Leverhulme Trust grant F/00203/X. We
thank the Air Force Office of Scientific Research, Air Force Material
Command, USAF for sponsorship under grant number FA8655-09-13085. D.B.J.
is grateful to the FWO for the award of a Marie Curie Pegasus
Fellowship.
NR 41
TC 6
Z9 6
U1 0
U2 0
PU EDP SCIENCES S A
PI LES ULIS CEDEX A
PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A,
FRANCE
SN 1432-0746
J9 ASTRON ASTROPHYS
JI Astron. Astrophys.
PD APR
PY 2013
VL 552
AR A55
DI 10.1051/0004-6361/201220055
PG 7
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 130JW
UT WOS:000317912000055
ER
PT J
AU Cain, J
DeWitt, MJ
Blunck, D
Corporan, E
Striebich, R
Anneken, D
Klingshirn, C
Roquemore, WM
Vander Wal, R
AF Cain, Jeremy
DeWitt, Matthew J.
Blunck, David
Corporan, Edwin
Striebich, Richard
Anneken, David
Klingshirn, Christopher
Roquemore, W. M.
Vander Wal, Randy
TI Characterization of Gaseous and Particulate Emissions From a Turboshaft
Engine Burning Conventional, Alternative, and Surrogate Fuels
SO ENERGY & FUELS
LA English
DT Article; Proceedings Paper
CT 13th International Conference on Petroleum Phase Behavior and Fouling
CY JUN 10-14, 2012
CL St. Pete Beach, FL
ID AIRCRAFT TURBINE-ENGINES; FISCHER-TROPSCH FUELS; HYDROCARBON EMISSIONS;
CHEMICAL-COMPOSITION; RESEARCH COMBUSTOR; EXHAUST; SOOT; COMPONENTS;
FLAMES; GROWTH
AB The effect of fuel composition on the operability and gaseous and particulate matter (PM) emissions of an Allison T63-A-700 turboshaft engine operated at four power settings was investigated in this effort. Testing was performed with a specification JP-8, a synthetic paraffinic kerosene, and four two-component surrogate mixtures that comprise compound classes within current and future alternative fuels. Comparable engine operability was observed for all fuels during this study. Major gaseous emissions were only slightly effected, with trends consistent with those expected based on the overall hydrogen content of the fuels. However, minor hydrocarbon and aldehyde emissions were significantly more sensitive to the fuel chemical composition. Linear correlations between speciated hydrocarbon and aldehyde emissions were observed over the full engine operating range for the fuels tested. The corresponding slopes were dependent on the fuel composition, indicating that fuel chemistry affects the selectivity to specific decomposition pathways. Unburned fuel components were observed in the engine exhaust during operation with all fuels, demonstrating that completely unreacted fuel compounds can pass through the high temperature/pressure combustion zone. Nonvolatile PM emissions (soot) were strongly affected by the fuel chemical composition. Paraffinic fuels produced significantly lower PM number and mass emissions relative to aromatic-containing fuels, with the paraffin structure affecting sooting propensity. The observations are consistent with those expected based on simplified soot formation mechanisms, where fuels with direct precursors for polycyclic aromatic hydrocarbon formation have higher PM formation rates. The effect of a specific chemical structure on the relative PM production is important as this would not be evident when comparing sooting tendencies of fuels based on bulk fuel properties. All fuels produced similar single log-normal size distributions of soot, with higher sooting fuels producing larger mean diameter particles. It is hypothesized that the controlling growth and formation mechanisms for PM production are similar for different fuel chemistries in this regime, with composition primarily affecting soot formation rate. This hypothesis was supported by preliminary TEM analyses that showed similar soot microstructures during operation with either conventional JP-8 or alternative fuels. Overall, this study provides additional and improved insight into the effect of fuel chemical composition on complex combustion chemistry and emissions propensity in a gas turbine engine, and can assist with the successful development of predictive modeling tools.
C1 [Cain, Jeremy] CNR, Wright Patterson AFB, OH 45433 USA.
[DeWitt, Matthew J.; Striebich, Richard; Anneken, David; Klingshirn, Christopher] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Blunck, David; Corporan, Edwin; Roquemore, W. M.] USAF, Res Lab, Propuls Directorate, Wright Patterson AFB, OH 45433 USA.
[Vander Wal, Randy] Penn State Univ, University Pk, PA 16802 USA.
RP DeWitt, MJ (reprint author), Univ Dayton, Res Inst, 300 Coll Pk, Dayton, OH 45469 USA.
EM matthew.dewitt@wpafb.af.mil
FU Strategic Environmental Research and Development Program [WP2145];
National Research Council Research Associateship Award at
Wright-Patterson Air Force Base; Air Force Research Laboratory
[FA8650-10-2-2934]
FX Funding for this work through the Strategic Environmental Research and
Development Program (WP2145) is gratefully appreciated. The authors
thank Dr. Tim Edwards (AFRL) for supplying the fuels, Dean Brigalli
(AFRL) for operating the engine, and Joe Mantz (UDRI) for experimental
setup and operation. Rhonda Cook and Linda Shafer provided analytical
support and fuel property measurements, and the Air Force Petroleum
Agency is thanked for performing the ASTM specification testing. This
research was performed while Jeremy Cain held a National Research
Council Research Associateship Award at Wright-Patterson Air Force Base.
The support of Dr. Alexander Laskin (Pacific Northwest National
Laboratory) in loaning the cascade impactor is greatly appreciated. The
authors also thank the reviewers of this manuscript for useful
suggestions. The efforts of UDRI were sponsored by the Air Force
Research Laboratory under the Cooperative Research Agreement
FA8650-10-2-2934. The views and conclusions contained herein are those
of the authors and should not be interpreted as necessarily representing
the official policies or endorsements, either expressed or implied, of
Air Force Research Laboratory or the U.S. Government.
NR 47
TC 10
Z9 10
U1 2
U2 38
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0887-0624
EI 1520-5029
J9 ENERG FUEL
JI Energy Fuels
PD APR
PY 2013
VL 27
IS 4
BP 2290
EP 2302
DI 10.1021/ef400009c
PG 13
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 130WN
UT WOS:000317950900060
ER
PT J
AU Xiao, ZW
Wu, Q
Luo, SD
Zhang, C
Baur, J
Justice, R
Liu, T
AF Xiao, Zhiwei
Wu, Qiang
Luo, Sida
Zhang, Chuck
Baur, Jeffery
Justice, Ryan
Liu, Tao
TI Shape Matters: A Gold Nanoparticle Enabled Shape Memory Polymer
Triggered by Laser Irradiation
SO PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
LA English
DT Article
DE gold nanoparticles; laser activation; nanocomposites; shape-memory
polymers; structure-property relationships
ID POLYURETHANE ELASTOMERS; MAGNETIC NANOPARTICLES; HARD DOMAINS; NANORODS;
NANOSTRUCTURES; TECOFLEX(R); SCATTERING; PROGRESS; SPECTRA; STRAIN
AB With incorporation of gold nanoparticles, i.e., nanorods (AuNR) and nanospheres (AuNS), into a polyurethane-based shape-memory polymer (SMP) EG-72D matrix, SMP nanocomposite films capable of being remotely triggered by low-power laser are fabricated and characterized using UV-vis-NIR spectroscopy, X-ray scattering, and dynamic mechanical analysis (DMA). It is demonstrated that, with incorporation of very low concentration of gold nanorods (approximate to 0.1 wt%), the mechanically programmed EG-72D/AuNR nanocomposite presents rapid response to low power laser irradiation (785 nm, approximate to 10 mW). Comparative studies on the laser irradiation response of EG-72D/AuNS and EG-72D/AuNR nanocomposite films suggest that AuNRs have significantly higher photothermal conversion efficiency than AuNS and on-resonance laser irradiation, matching the wavelength of the incident laser with the longitudinal plasmon resonance of AuNR, is necessary to induce the fast response of gold nanoparticle enabled SMP nanocomposites.
C1 [Xiao, Zhiwei; Wu, Qiang; Luo, Sida; Zhang, Chuck; Liu, Tao] Florida State Univ, High Performance Mat Inst, Tallahassee, FL 32310 USA.
[Baur, Jeffery; Justice, Ryan] USAF, AFRL RXBC, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Xiao, ZW (reprint author), Florida State Univ, High Performance Mat Inst, Tallahassee, FL 32310 USA.
EM liutao@eng.fsu.edu
RI Wu, Qiang/C-2437-2011; Xiao, Zhiwei/A-7500-2015;
OI Wu, Qiang/0000-0003-2774-1506; Xiao, Zhiwei/0000-0001-7935-4845; Liu,
Tao/0000-0003-0267-4925
FU Air Force Research Laboratory (AFRL); High-Performance Materials
Institute at Florida State University
FX The authors acknowledge the financial support provided by the Air Force
Research Laboratory (AFRL) and the High-Performance Materials Institute
at Florida State University.
NR 41
TC 7
Z9 8
U1 7
U2 49
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA POSTFACH 101161, 69451 WEINHEIM, GERMANY
SN 0934-0866
EI 1521-4117
J9 PART PART SYST CHAR
JI Part. Part. Syst. Charact.
PD APR
PY 2013
VL 30
IS 4
BP 338
EP 345
DI 10.1002/ppsc.201200088
PG 8
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 132ZA
UT WOS:000318106000007
ER
PT J
AU Del Arroyo, JRG
Jackson, JA
AF Del Arroyo, Jose R. Gutierrez
Jackson, Julie Ann
TI WiMAX OFDM for Passive SAR Ground Imaging
SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
LA English
DT Article
ID AMBIGUITY FUNCTION; RADAR; SIGNAL
AB Modern communication systems provide myriad opportunities for passive radar applications. Research is introduced here on the passive use of worldwide inoperability for microwave access (WiMAX) orthogonal frequency division multiplexing (OFDM) waveforms for synthetic aperture radar (SAR) ground imaging. The anatomy of the waveform is presented followed by a brief bistatic ambiguity function analysis. The monostatic and bistatic models for OFDM range compression are derived and validated with experimental data. We conclude with SAR imaging results and a discussion on future research.
C1 [Del Arroyo, Jose R. Gutierrez; Jackson, Julie Ann] USAF, Inst Technol, Dept Elect & Comp Engn, AFIT ENG, Wright Patterson AFB, OH 45433 USA.
RP Del Arroyo, JRG (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, AFIT ENG, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM julie.jackson@afit.edu
RI Furumoto, Jun-ichi/E-8676-2013
NR 41
TC 9
Z9 9
U1 0
U2 16
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9251
EI 1557-9603
J9 IEEE T AERO ELEC SYS
JI IEEE Trans. Aerosp. Electron. Syst.
PD APR
PY 2013
VL 49
IS 2
BP 945
EP 959
PG 15
WC Engineering, Aerospace; Engineering, Electrical & Electronic;
Telecommunications
SC Engineering; Telecommunications
GA 127AY
UT WOS:000317667700018
ER
PT J
AU Kwon, Y
Narayanan, RM
Rangaswamy, M
AF Kwon, Yangsoo
Narayanan, Ram M.
Rangaswamy, Muralidhar
TI Multi-Target Detection using Total Correlation for Noise Radar Systems
SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
LA English
DT Article
ID WAVE-FORM DESIGN; DETECTION PERFORMANCE; MIMO RADAR; INFORMATION;
SAMPLES; MATRIX; OPTIMIZATION; ENTROPY
AB Target detection is one of the important functions of radar systems. In this paper, we present a detection method using total correlation (TC) based on information theory for noise radar systems which enables the detection of multiple targets at intermediate and low signal-to-noise ratio (SNR) regimes. The proposed method utilizes the largest eigenvalue of the sample covariance matrix to extract information from the transmitted signal replica, and outperforms the conventional TC detector when reflected signals have intermediate or low SNR values. Additionally, in order to avoid ambiguous target occurrence, we propose an adaptive threshold to guarantee the detection performance with the same receiving antenna elements for a given false alarm probability. The threshold is computed from the largest and smallest eigenvalue distributions based on random matrix theory. Simulations show that the proposed detection method can be used for a wide range of SNR environments, and the threshold provides definitive target detection.
C1 [Kwon, Yangsoo; Narayanan, Ram M.] Penn State Univ, University Pk, PA 16802 USA.
[Rangaswamy, Muralidhar] USAF, Res Lab, RF Exploitat Technol Branch, Sensors Directorate, Wright Pattterson AFB, OH USA.
RP Kwon, Y (reprint author), Penn State Univ, Dept Elect Engn, 202 EE East Bldg, University Pk, PA 16802 USA.
EM ram@engr.psu.edu
FU Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0605]
FX The research is supported by the Air Force Office of Scientific Research
(AFOSR) Contract FA9550-09-1-0605.
NR 28
TC 2
Z9 2
U1 2
U2 11
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9251
EI 1557-9603
J9 IEEE T AERO ELEC SYS
JI IEEE Trans. Aerosp. Electron. Syst.
PD APR
PY 2013
VL 49
IS 2
BP 1251
EP 1262
PG 12
WC Engineering, Aerospace; Engineering, Electrical & Electronic;
Telecommunications
SC Engineering; Telecommunications
GA 127AY
UT WOS:000317667700038
ER
PT J
AU Horvath, MS
Gorham, LA
Rigling, BD
AF Horvath, Matthew S.
Gorham, LeRoy A.
Rigling, Brian D.
TI Scene Size Bounds for PFA Imaging with Postfiltering
SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
LA English
DT Editorial Material
ID FRONT CURVATURE CORRECTION; BISTATIC SAR IMAGE; RANGE
AB The polar format algorithm (PFA) for synthetic aperture radar (SAR) image formation utilizes a first-order Taylor approximation of the differential range to improve computational efficiency, leading to image distortion and defocus. Limiting scene size by bounding the second-order Taylor series terms can restrict the impact of these errors, or alternatively, one may correct for these errors through spatially-variant filtering in post processing. In this letter we analyze the increase in allowable scene size that is realized through such processing.
C1 [Horvath, Matthew S.] MacAulay Brown Inc, Dayton, OH 45430 USA.
[Gorham, LeRoy A.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Rigling, Brian D.] Wright State Univ, Dept Elect Engn, Dayton, OH 45435 USA.
RP Horvath, MS (reprint author), MacAulay Brown Inc, 4021 Execut Dr, Dayton, OH 45430 USA.
EM brian.rigling@wright.edu
NR 12
TC 3
Z9 4
U1 0
U2 2
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9251
EI 1557-9603
J9 IEEE T AERO ELEC SYS
JI IEEE Trans. Aerosp. Electron. Syst.
PD APR
PY 2013
VL 49
IS 2
BP 1402
EP 1406
PG 6
WC Engineering, Aerospace; Engineering, Electrical & Electronic;
Telecommunications
SC Engineering; Telecommunications
GA 127AY
UT WOS:000317667700054
ER
PT J
AU Franzi, MA
Gilgenbach, RM
Hoff, BW
Chalenski, DA
Simon, D
Lau, YY
Luginsland, J
AF Franzi, Matthew A.
Gilgenbach, Ronald M.
Hoff, Brad W.
Chalenski, David A.
Simon, David
Lau, Y. Y.
Luginsland, John
TI Recirculating-Planar-Magnetron Simulations and Experiment
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Cavity magnetron; high power microwave; recirculating planar magnetron
(RPM); vacuum electronics
ID RELATIVISTIC MAGNETRON
AB Microwave oscillation has been measured for the first time in a 12-cavity axial-magnetic-field recirculating planar magnetron, designed to operate in pi mode at 1 GHz. The device operates with a -300-kV pulsed cathode voltage and a 0.2-T axial magnetic field, and oscillates at transverse currents exceeding 1 kA when driven by an electron beam pulselength between 0.5 and 1 mu s. Microwave pulses were measured at frequencies between 0.97-1 GHz and achieved several hundred nanoseconds in length. Mode competition was observed between the pi and 5 pi/6 modes.
C1 [Franzi, Matthew A.; Gilgenbach, Ronald M.; Chalenski, David A.; Simon, David; Lau, Y. Y.] Univ Michigan, Plasma Pulsed Power & Microwave Lab, Ann Arbor, MI 48109 USA.
[Hoff, Brad W.] USAF, Res Lab, Albuquerque, NM 87117 USA.
[Luginsland, John] USAF, Off Sci Res, Arlington, VA 22203 USA.
RP Franzi, MA (reprint author), Univ Michigan, Plasma Pulsed Power & Microwave Lab, Ann Arbor, MI 48109 USA.
RI Simon, David/L-8446-2016
OI Simon, David/0000-0001-8666-995X
FU Air Force Office of Scientific Research [FA9550-10-1-0104]; Air Force
Research Laboratory; L-3 Communications Electron Devices
FX Manuscript received October 3, 2012; revised December 17, 2012; accepted
January 4, 2013. Date of publication March 7, 2013; date of current
version April 6, 2013. This work supported in part by the Air Force
Office of Scientific Research under Grant FA9550-10-1-0104, by the Air
Force Research Laboratory, and by L-3 Communications Electron Devices.
NR 15
TC 13
Z9 13
U1 0
U2 7
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2013
VL 41
IS 4
SI SI
BP 639
EP 645
DI 10.1109/TPS.2013.2242493
PN 1
PG 7
WC Physics, Fluids & Plasmas
SC Physics
GA 130MK
UT WOS:000317921400002
ER
PT J
AU Sweeney, LM
Prues, SL
Reboulet, JE
AF Sweeney, Lisa M.
Prues, Susan L.
Reboulet, James E.
TI Subacute effects of inhaled Jet Fuel-A (Jet A) on airway and immune
function in female rats
SO INHALATION TOXICOLOGY
LA English
DT Article
DE 2 week; bronchoalveolar lavage; immunotoxicity; inhalation; Jet A; Jet
fuel; lung injury; nasal lavage; rats; vapor and aerosol
ID INHALATION EXPOSURE; DERMAL APPLICATION; JP-8; IMMUNOTOXICITY; TOXICITY;
SYSTEM; VAPOR; SUPPRESSION; AEROSOL; MODELS
AB Two studies were conducted to assess the potential airway and immune effects following subacute (14 d) exposure of female rats to 500, 1000 or 2000 mg/m(3) of Jet-A for 4 h/d. The first study used Sprague-Dawley rats; the second study included both Fischer 344 (F344) and Sprague-Dawley rats. In the first study, exposure to 2000 mg/m(3) jet fuel may have caused significant upper airway inflammation on day 7 post-exposure, as indicated by elevated protein and lactate dehydrogenase in nasal lavage fluid, but any inflammation resolved by day 14 post-exposure. No significant impact on immune cell populations in the spleens was observed. The histological examination showed no evidence of infectious or toxic effect. In the second study, body weights of the F344 rats in the 2000 mg/m(3) group were depressed, as compared to the controls, at the end of the exposure. Some lung lavage fluid markers were increased at 24 h after the final exposure, however, no test article-induced histological changes were observed in the lungs, nasal cavities, or any other tissue of any of the jet fuel exposed animals. Overall, these studies demonstrated limited evidence of effects of 14 d of exposure to Jet A on the airways, immune system, or any other organ or system of female Sprague-Dawley and F344 rats, with no remarkable differences between strains. The lack of identified significant airway or immune effects was in contrast to previous examinations of jet fuel for pulmonary toxicity in mice and rats and for immunotoxicity in mice.
C1 [Sweeney, Lisa M.] USAF, Henry M Jackson Fdn Adv Mil Med, Med Res Unit Dayton NAMRU D, Wright Patterson AFB, OH 45433 USA.
[Prues, Susan L.] NAMRU D, Wright Patterson AFB, OH USA.
[Reboulet, James E.] NAMRU D, CAMRIS, Wright Patterson AFB, OH USA.
RP Sweeney, LM (reprint author), USAF, DABT, Med Res Unit Dayton, Area B, 2729 R St,Bldg 837, Wright Patterson AFB, OH 45433 USA.
EM Lisa.sweeney.ctr@wpafb.af.mil
RI Sweeney, Lisa/K-5114-2012
OI Sweeney, Lisa/0000-0002-4672-7358
FU Defense Health Programs
FX This work was supported by Defense Health Programs and conducted under
Work Unit # 60769. The views expressed in this article are those of the
authors and do not necessarily reflect the official policy or position
of the Department of the Navy, Department of Defense, nor the U.S.
Government.
NR 37
TC 0
Z9 0
U1 0
U2 2
PU INFORMA HEALTHCARE
PI LONDON
PA TELEPHONE HOUSE, 69-77 PAUL STREET, LONDON EC2A 4LQ, ENGLAND
SN 0895-8378
J9 INHAL TOXICOL
JI Inhal. Toxicol.
PD APR
PY 2013
VL 25
IS 5
BP 257
EP 271
DI 10.3109/08958378.2013.780191
PG 15
WC Toxicology
SC Toxicology
GA 131YJ
UT WOS:000318034500003
PM 23614727
ER
PT J
AU Visbal, M
Yilmaz, TO
Rockwell, D
AF Visbal, Miguel
Yilmaz, Turgut O.
Rockwell, Donald
TI Three-dimensional vortex formation on a heaving low-aspect-ratio wing:
Computations and experiments
SO JOURNAL OF FLUIDS AND STRUCTURES
LA English
DT Article
DE Dynamic stall; Unsteady flows; Vortices; Wing aerodynamics
ID LARGE-EDDY SIMULATION; FINITE-DIFFERENCE SCHEMES; LOW REYNOLDS-NUMBERS;
DYNAMIC STALL; PITCHING AIRFOIL; PLUNGING AIRFOIL; FLAT-PLATE; FLOW;
AERODYNAMICS; PREDICTION
AB This paper addresses by means of high-resolution numerical simulations and experimental quantitative imaging the three-dimensional unsteady separation process induced by large-amplitude heaving oscillations of a low-aspect-ratio wing under low-Reynolds-number conditions. Computed results are found to be in good agreement with experimental flow visualizations and Ply measurements on selected cross-flow planes. The complex unsteady three-dimensional flow structure generated during dynamic stall of the low-aspect-ratio wing is elucidated. The process is characterized by the generation of a leading-edge vortex system which is pinned at the front corners of the plate and which exhibits intense transverse flow toward the wing centerline during its initial stages of development. This vortex detaches from the corners and evolves into an newly found arch-type structure. The legs of the arch vortex move along the surface toward the wing centerline and reconnect forming a ring-like structure which is shed as the next plunging cycle begins. Vortex breakdown, total collapse and reformation of the wing tip vortices are also observed at various stages of the heaving motion. At the relatively high value of reduced frequency considered, these basic flow elements of the complex three-dimensional dynamic stall process are found to persist over a range of Reynolds numbers. Published by Elsevier Ltd.
C1 [Visbal, Miguel] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Yilmaz, Turgut O.; Rockwell, Donald] Lehigh Univ, Dept Mech Engn & Mech, Bethlehem, PA 18015 USA.
RP Visbal, M (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM miguel.visbal@wpafb.af.mil
FU AFOSR; DOD HPC Shared Resource Center at AFRL
FX This work was supported in part by AFOSR under tasks monitored by Dr. D.
Smith, and by a grant of HPC time from the DOD HPC Shared Resource
Center at AFRL.
NR 45
TC 18
Z9 18
U1 1
U2 34
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0889-9746
J9 J FLUID STRUCT
JI J. Fluids Struct.
PD APR
PY 2013
VL 38
BP 58
EP 76
DI 10.1016/j.jfluidstructs.2012.12.005
PG 19
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA 128XM
UT WOS:000317803000005
ER
PT J
AU Stanford, B
Beran, P
Snyder, R
Patil, M
AF Stanford, Bret
Beran, Philip
Snyder, Richard
Patil, Mayuresh
TI Stability and power optimality in time-periodic flapping wing structures
SO JOURNAL OF FLUIDS AND STRUCTURES
LA English
DT Article
DE Floquet multipliers; Aeroelastic tailoring; Flexible flapping wings;
Flight dynamics
ID DESIGN; FLIGHT; OPTIMIZATION; SENSITIVITY; DYNAMICS
AB This paper investigates the nonlinear dynamics of a vehicle with two flexible flapping wings. The body dynamics and the wings' deformation are monolithically grouped into a single system of equations, with aerodynamics accounted for by a quasi-steady blade element method. A periodic shooting method is then used to locate closed orbits of this non-autonomous system, and Floquet multipliers assess the linearized stability about the nonlinear orbit. This framework is then exposed to a gradient based optimizer, in order to quantify the role of wing planform variables, wing structure variables, and kinematic actuation variables in obtaining vehicles with superior open-loop stability characteristics, and/or low-power requirements. Published by Elsevier Ltd.
C1 [Stanford, Bret; Beran, Philip; Snyder, Richard] USAF, Res Lab, Dayton, OH 45433 USA.
[Patil, Mayuresh] Virginia Polytech & State Univ, Blacksburg, VA 24061 USA.
RP Stanford, B (reprint author), USAF, Res Lab, Dayton, OH 45433 USA.
EM bretkennedystanford@gmail.com
RI Patil, Mayuresh/E-4644-2013
OI Patil, Mayuresh/0000-0001-9601-2249
FU Air Force Office of Scientific Research [09RB01COR, 03VA01COR]
FX This work is sponsored by the Air Force Office of Scientific Research
under Laboratory Tasks 09RB01COR (monitored by Dr. Doug Smith) and
03VA01COR (monitored by Dr. FaribaFahroo).
NR 22
TC 3
Z9 3
U1 1
U2 12
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0889-9746
J9 J FLUID STRUCT
JI J. Fluids Struct.
PD APR
PY 2013
VL 38
BP 238
EP 254
DI 10.1016/j.jfluidstructs.2012.12.006
PG 17
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA 128XM
UT WOS:000317803000016
ER
PT J
AU Feng, YH
Kayode, O
Harper, WF
AF Feng, Yinghua
Kayode, Olubanke
Harper, Willie F., Jr.
TI Using microbial fuel cell output metrics and nonlinear modeling
techniques for smart biosensing
SO SCIENCE OF THE TOTAL ENVIRONMENT
LA English
DT Article
DE Microbial fuel cells; Biosensing; Neural network algorithms; Water
quality; Time series analysis
ID BIOCHEMICAL OXYGEN-DEMAND; ORGANIC-MATTER; TIME-SERIES; SENSOR;
PERFORMANCE; ELECTRICITY
AB Microbial fuel cells (MFCs) are promising tools for water quality monitoring but the response peaks have not been characterized and the data processing methods require improvement. In this study MFC-based biosensing was integrated with two nonlinear programming methods, artificial neural networks (ANN) and time series analysis (TSA). During laboratory testing, the MFCs generated well-organized normally-distributed peaks when the influent chemical oxygen demand (COD) was 150 mg/L or less, and multi-peak signals when the influent COD was 200 mg/L The area under the response peak correlated well with the influent COD concentration. During field testing, we observed normally-distributed and multi-peak profiles at low COD concentrations. The ANN predicted the COD concentration without error with just one layer of hidden neurons, and the TSA model predicted the temporal trends present in properly functioning MFCs and in a device that was gradually failing. This report is the first to integrate ANN and TSA with MFC-based biosensing. Published by Elsevier B.V.
C1 [Feng, Yinghua; Kayode, Olubanke] Univ Pittsburgh, Dept Civil & Environm Engn, Swanson Sch Engn, Pittsburgh, PA 15261 USA.
[Harper, Willie F., Jr.] USAF, Inst Technol, Dept Syst & Engn Management, Wright Patterson AFB, OH 45433 USA.
RP Harper, WF (reprint author), USAF, Inst Technol, Dept Syst & Engn Management, Wright Patterson AFB, OH 45433 USA.
EM willie.harper@afit.edu
FU National Oceanic and Atmospheric Administration [NA09NOS4200029]
FX Financial support for this project was provided by the National Oceanic
and Atmospheric Administration (Grant No. NA09NOS4200029). The authors
thank Frank Lopez and Dr. David Klarer (Old Woman Creek National Estuary
Research Reserve, Huron, OH) for technical and logistical assistance. We
also thank William Barr (Ph.D. student, Arizona State University),
Wenjing (Lisa) Cheng (Ph.D. student, University of Pittsburgh), Bo Niu
(MS. student, University of Pittsburgh), and Christine Currie
(Undergraduate student, Columbia University, New York, NY) for
experimental assistance. We thank David Sanchez (Ph.D. student,
University of Pittsburgh) for help with the Keithley Meter and Dr.
Piervincenzo Rizzo (Civil and Environmental Engineering, University of
Pittsburgh) for advice related to ANNs. The authors thank the anonymous
reviewers for their suggestions. The views expressed in this article are
those of the authors and do not reflect the official policy or position
of the Air Force Institute of Technology, United States Air Force,
Department of Defense, or United States government.
NR 28
TC 6
Z9 6
U1 6
U2 42
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0048-9697
J9 SCI TOTAL ENVIRON
JI Sci. Total Environ.
PD APR 1
PY 2013
VL 449
BP 223
EP 228
DI 10.1016/j.scitotenv.2013.01.004
PG 6
WC Environmental Sciences
SC Environmental Sciences & Ecology
GA 125KH
UT WOS:000317538200025
PM 23428752
ER
PT J
AU Berrebi, C
Ostwald, J
AF Berrebi, Claude
Ostwald, Jordan
TI Exploiting the Chaos: Terrorist Target Choice Following Natural
Disasters
SO SOUTHERN ECONOMIC JOURNAL
LA English
DT Article
ID TRANSNATIONAL TERRORISM; POVERTY; MODEL; RISK
AB This article explores the differences between transnational and domestic terrorism, further differentiating by private versus' government targets, to estimate the effect of exogenous catastrophic shocks on a country's level of domestic and transnational terrorism. The empirical analysis uses detailed data on terrorism, natural disasters, and other relevant controls for 176 countries from 1970-2007 to illuminate several key disparities in a postdisaster target choice of terrorists. The results indicate that natural disasters incite both transnational and domestic terrorism; however, evidence is found for dissimilar motivations between the two. While both types of terrorism increase after disasters, transnational attacks against the government increase immediately following the disaster, suggesting an impetus to exploit weakened "hard" targets during the chaos. Conversely, domestic terrorism against the government takes longer to manifest, suggesting a period of time for which the public recovers and assesses the government's response.
C1 [Berrebi, Claude] Hebrew Univ Jerusalem, Federmann Sch Publ Policy & Govt, IL-91905 Jerusalem, Israel.
[Ostwald, Jordan] USAF, San Angelo, TX 76904 USA.
RP Berrebi, C (reprint author), Hebrew Univ Jerusalem, Federmann Sch Publ Policy & Govt, IL-91905 Jerusalem, Israel.
EM berrebi@rand.org; jostwald@gmail.com
NR 50
TC 4
Z9 4
U1 0
U2 8
PU UNIV NORTH CAROLINA
PI CHAPEL HILL
PA SOUTHERN ECONOMIC JOURNAL, CHAPEL HILL, NC 27514 USA
SN 0038-4038
J9 SOUTH ECON J
JI South. Econ. J.
PD APR
PY 2013
VL 79
IS 4
BP 793
EP 811
DI 10.4284/0038-4038-2012.268
PG 19
WC Economics
SC Business & Economics
GA 126RW
UT WOS:000317639900004
ER
PT J
AU Reeves, WK
Loftis, AD
Beck, J
AF Reeves, W. K.
Loftis, A. D.
Beck, J.
TI A New Species of Nycterophilia (Diptera: Streblidae) from the Antillean
Fruit-eating Bat, Brachyphylla cavernarum (Chiroptera: Phyllostomidae)
SO JOURNAL OF ENTOMOLOGICAL SCIENCE
LA English
DT Article
DE Streblidae; Nycterophilia; Saint Kitts; Brachyphylla cavernarum
AB A new species of streblid (Diptera: Streblidae) bat fly in the genus Nycterophilia is described from collections made from Antillean fruit-eating bats, Brachyphylla cavernarum Gray, trapped on St. Kitts in the Caribbean. We describe morphological features that separate this new species from other Nycterophiliinae including Phalconomus puliciformis Wenzel, Nycterophilia coxata Ferris, Nycterophilia fairchildi Wenzel, Nycterophilia mormoopsis Wenzel, Nycterophilia natali Wenzel, and Nycterophilia parnelli Wenzel.
C1 [Reeves, W. K.; Loftis, A. D.; Beck, J.] USAF, Sch Aerosp Med PHR, Wright Patterson AFB, OH 45433 USA.
RP Reeves, WK (reprint author), USAF, Sch Aerosp Med PHR, 2510 5th St, Wright Patterson AFB, OH 45433 USA.
EM wkreeves@gmail.com
FU Ross University
FX The authors thank the students at Ross University who assisted with the
capture of these bats: Monica DeVilbiss, Thomas Hester, Maria Racioppo,
Carolyn Scott, and Elizabeth Topliff. We also thank Robert Williams and
Helene Lucas-Williams for allowing bat netting on their property.
Funding was provided in part by an intramural research grant from Ross
University. The views expressed in this article are those of the authors
and do not reflect the official policy or position of the Department of
the Air Force, the Department of Defense, or the U.S. Government.
Distribution A: Approved for public release; distribution is unlimited.
Case Number: 88ABW-2012-3375, 13 Jun 2012.
NR 9
TC 3
Z9 3
U1 0
U2 5
PU GEORGIA ENTOMOLOGICAL SOC INC
PI TIFTON
PA PO BOX 748 DEPT ENTOMOLOGY COASTAL PLAIN EXPT STATION, TIFTON, GA
31793-0748 USA
SN 0749-8004
J9 J ENTOMOL SCI
JI J. Entomol. Sci.
PD APR
PY 2013
VL 48
IS 2
BP 114
EP 117
PG 4
WC Entomology
SC Entomology
GA 124ES
UT WOS:000317447200004
ER
PT J
AU Fino, SA
AF Fino, Steven A.
TI Breaking the Trance: The Perils of Technological Exuberance in the US
Air Force Entering Vietnam
SO JOURNAL OF MILITARY HISTORY
LA English
DT Article
AB A survey of U.S. Air Force air-to-air armament from World War II through Vietnam's Operation ROLLING THUNDER reveals the institution's focus on developing advanced technologies and tactics designed to thwart hordes of Soviet bombers. Challenged by nimble MiGs over Vietnam, the service was reluctant to investigate "low-tech" armament solutions. When the value of a gun in air combat was finally acknowledged, the Air Force elected to field it as part of an integrated weapons system on the F-4E. In the interim, pilots at DaNang air base cobbled together an inelegant but effective air-to-air external gun system. The episode reveals the significant potential, and fragility, of unit-initiated tactical innovation and the peril that can arise when an organization's technological exuberance obfuscates less technologically-appealing solutions.
C1 [Fino, Steven A.] USAF, Wright Patterson AFB, OH USA.
RP Fino, SA (reprint author), MIT, Engn Syst Div, Cambridge, MA 02139 USA.
NR 101
TC 0
Z9 0
U1 1
U2 6
PU SOC MILITARY HISTORY
PI LEXINGTON
PA C/O VIRGINIA MILITARY INST, GEORGE C MARSHALL LIBRARY, LEXINGTON, VA
24450-1600 USA
SN 0899-3718
J9 J MILITARY HIST
JI J. Mil. Hist.
PD APR
PY 2013
VL 77
IS 2
BP 625
EP 655
PG 31
WC History
SC History
GA 120GN
UT WOS:000317158900008
ER
PT J
AU Grotelueschen, ME
AF Grotelueschen, Mark E.
TI The Zimmermann Telegram: Intelligence, Diplomacy, and America's Entry
into World War I
SO JOURNAL OF MILITARY HISTORY
LA English
DT Book Review
C1 [Grotelueschen, Mark E.] USAF Acad, Colorado Springs, CO 80840 USA.
RP Grotelueschen, ME (reprint author), USAF Acad, Colorado Springs, CO 80840 USA.
NR 1
TC 0
Z9 0
U1 0
U2 1
PU SOC MILITARY HISTORY
PI LEXINGTON
PA C/O VIRGINIA MILITARY INST, GEORGE C MARSHALL LIBRARY, LEXINGTON, VA
24450-1600 USA
SN 0899-3718
J9 J MILITARY HIST
JI J. Mil. Hist.
PD APR
PY 2013
VL 77
IS 2
BP 720
EP 721
PG 2
WC History
SC History
GA 120GN
UT WOS:000317158900043
ER
PT J
AU Fleigel, JD
Sutton, AJ
AF Fleigel, Jeffrey D., III
Sutton, Alan J.
TI Reliable and Repeatable Centric Relation Adjustment of the Maxillary
Occlusal Device
SO JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY
LA English
DT Article
DE Centric relation; leaf gauge; occlusal device; occlusal device
adjustment; anterior deprogrammer; occlusal splint
AB This technique article describes a quantifiable, repeatable, and reliable method for occlusal device adjustment in centric relation using a leaf gauge. In addition, specific suggestions for occlusal device design are provided to enhance patient comfort with the prosthesis in place.
C1 [Fleigel, Jeffrey D., III] US AF Dent Corps Reserve, Sheppard Afb, TX USA.
[Sutton, Alan J.] USAF, Dept Maxillofacial Prosthodont, Lackland AFB, TX USA.
RP Fleigel, JD (reprint author), 7200 N MoPac Expy 215, Austin, TX 78731 USA.
EM jfleigelpros@gmail.com
NR 12
TC 1
Z9 2
U1 0
U2 5
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 1059-941X
J9 J PROSTHODONT
JI J. Prosthodont.
PD APR
PY 2013
VL 22
IS 3
BP 233
EP 236
DI 10.1111/j.1532-849X.2012.00926.x
PG 4
WC Dentistry, Oral Surgery & Medicine
SC Dentistry, Oral Surgery & Medicine
GA 126MC
UT WOS:000317619800014
PM 22984889
ER
PT J
AU Crownover, BK
Bepko, JL
AF Crownover, Brian K.
Bepko, Jennifer L.
TI Appropriate and Safe Use of Diagnostic Imaging
SO AMERICAN FAMILY PHYSICIAN
LA English
DT Article
ID NEPHROGENIC SYSTEMIC FIBROSIS; LOW-BACK-PAIN; COMPUTED-TOMOGRAPHY;
AMERICAN-ACADEMY; ISCHEMIC-STROKE; GUIDELINE; RADIATION; MANAGEMENT;
RADIOLOGY; EXPOSURE
AB Risks of diagnostic imaging include cancer from radiation exposure and nephrogenic systemic fibrosis. The increase in volume of imaging between 1980 and 2006 has led to a sixfold increase in annual per capita radiation exposure. It is predicted that 2 percent of future cancers will be caused by radiation from computed tomography (CT) exposure. Gadolinium contrast media should be avoided in patients with stage 4 or 5 chronic kidney disease because of the risk of nephrogenic systemic fibrosis. Appropriate use of imaging based on guidelines for specific clinical conditions can reduce these risks. Although noncontrast CT of the head is needed to rule out bleeding in patients with suspected stroke within the first three hours of symptom onset, diffusion-weighted imaging with magnetic resonance of the head and neck is superior to CT within three to 24 hours of symptom onset. Headache merits neuroimaging in special circumstances only. Sestamibi radioisotope has less radiation than thallium for myocardial perfusion imaging. Use of intravenous contrast media with abdominopelvic CT significantly increases the diagnostic accuracy for appendicitis. Cholescintigraphy has better discrimination to diagnose acute cholecystitis than CT in patients with equivocal ultrasonography results. Limited three-view intravenous urography is recommended in pregnancy to evaluate urolithiasis if initial ultrasonography findings are negative or equivocal. Given that many asymptomatic adults have abnormal findings on lumbar spine magnetic resonance imaging, this modality generally should not be performed for nonspecific chronic low back pain in the absence of red flags. Whole body scanning is not supported by current evidence. (Am Fam Physician. 2013;87(7):494-501. Copyright (c) 2013 American Academy of Family Physicians.)
C1 [Crownover, Brian K.; Bepko, Jennifer L.] AF Base Family Med Residency, Nellis Afb, NV 89191 USA.
RP Crownover, BK (reprint author), AF Base Family Med Residency, 4700 Las Vegas Blvd North, Nellis Afb, NV 89191 USA.
EM brian.crownover@us.af.mil
NR 50
TC 11
Z9 11
U1 0
U2 18
PU AMER ACAD FAMILY PHYSICIANS
PI KANSAS CITY
PA 8880 WARD PARKWAY, KANSAS CITY, MO 64114-2797 USA
SN 0002-838X
J9 AM FAM PHYSICIAN
JI Am. Fam. Physician
PD APR 1
PY 2013
VL 87
IS 7
BP 494
EP 501
PG 8
WC Primary Health Care; Medicine, General & Internal
SC General & Internal Medicine
GA 121QR
UT WOS:000317259800006
PM 23547591
ER
PT J
AU Martinez, BC
DeJong, JT
Ginn, TR
Montoya, BM
Barkouki, TH
Hunt, C
Tanyu, B
Major, D
AF Martinez, B. C.
DeJong, J. T.
Ginn, T. R.
Montoya, B. M.
Barkouki, T. H.
Hunt, C.
Tanyu, B.
Major, D.
TI Experimental Optimization of Microbial-Induced Carbonate Precipitation
for Soil Improvement
SO JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
LA English
DT Article
DE Biomediated soil improvement; Microbially induced calcite precipitation;
Ground improvement; Biosoils; Ureolytic; Ureolysis; Geophysics
ID CALCITE PRECIPITATION; UREA HYDROLYSIS; TRANSPORT; SAND
AB Implementation of laboratory-tested biomediated soil improvement techniques in the field depends on upscaling the primary processes and controlling their rates. Microbial-induced carbonate precipitation (MICP) holds the potential for increasing the shear stiffness and reducing the hydraulic conductivity by harnessing a natural microbiological process that precipitates calcium carbonate. The study presented herein focuses on controlling MICP treatment of one-dimensional flow, half-meter-scale column experiments. Treatment was optimized by varying procedural parameters in five pairs of experiments including flow rates, flow direction, and formulations of biological and chemical amendments. Monitoring of column experiments included spatial and temporal measurements of the physical, chemical, and biological properties essential to the performance of MICP, including shear wave velocity, permeability, calcium carbonate content, aqueous calcium, aqueous ammonium, aqueous urea, and bacterial density. Relatively uniform improvement of a half-meter one-dimensional flow sand column experiment resulted in a change from a shear wave velocity of 140 m/s to an average of 600 m/s. Examination of data sets provides insight into which parameters have a first-order effect of MICP treatment uniformity and efficiency and how these parameters can be monitored and controlled. DOI:10.1061/(ASCE)GT.1943-5606.0000787. (C) 2013 American Society of Civil Engineers.
C1 [Martinez, B. C.; Hunt, C.] Geosyntec Consultants Inc, Oakland, CA 94607 USA.
[DeJong, J. T.; Ginn, T. R.] Univ Calif Davis, Dept Civil & Environm Engn, Davis, CA 95616 USA.
[Montoya, B. M.] N Carolina State Univ, Dept Civil Construct & Environm Engn, Raleigh, NC 27695 USA.
[Barkouki, T. H.] USAF, Special Operat Command, Hurlburt Field, FL 32544 USA.
[Tanyu, B.] George Mason Univ, Civil Environm & Infrastruct Engn Dept, Fairfax, VA 22030 USA.
[Major, D.] Geosyntec Consultants Inc, Guelph, ON N1G 5G3, Canada.
RP DeJong, JT (reprint author), Univ Calif Davis, Dept Civil & Environm Engn, Davis, CA 95616 USA.
EM bmartinez@geosyntec.com; jdejong@ucdavis.edu; trginn@ucdavis.edu;
bmmorten@ncsu.edu; thbarkouki@gmail.com; chunt@geosyntec.com;
btanyu@gmu.edu; dmajor@geosyntec.com
FU Geosyntec Consultants Inc.; Univ. of California; National Science
Foundation [0727463, 0628782]
FX Funding for the current study was provided by Geosyntec Consultants
Inc., the Univ. of California Discovery Grant Program, and the National
Science Foundation (Grant Nos. 0727463 and 0628782). The assistance of
Dr. Nelson in developing and refining the microbiological procedures is
especially appreciated. Any opinions, findings, and conclusions or
recommendations expressed in this material are those of the writer(s)
and do not necessarily reflect the views of the National Science
Foundation.
NR 27
TC 29
Z9 35
U1 6
U2 57
PU ASCE-AMER SOC CIVIL ENGINEERS
PI RESTON
PA 1801 ALEXANDER BELL DR, RESTON, VA 20191-4400 USA
SN 1090-0241
J9 J GEOTECH GEOENVIRON
JI J. Geotech. Geoenviron. Eng.
PD APR
PY 2013
VL 139
IS 4
BP 587
EP 598
DI 10.1061/(ASCE)GT.1943-5606.0000787
PG 12
WC Engineering, Geological; Geosciences, Multidisciplinary
SC Engineering; Geology
GA 118YG
UT WOS:000317062600007
ER
PT J
AU Engelhardt, KE
Starnes, S
Hanseman, D
Guitron, J
AF Engelhardt, K. E.
Starnes, S.
Hanseman, D.
Guitron, J.
TI Epidural versus Subpleural Analgesia for Pulmonary Resections: A
Comparison of Morbidities.
SO JOURNAL OF THE AMERICAN GERIATRICS SOCIETY
LA English
DT Meeting Abstract
CT Annual Scientific Meeting of the American-Geriatrics-Society
CY MAY 03-05, 2013
CL Grapevine, TX
SP Amer Geriatr Soc
C1 [Engelhardt, K. E.; Starnes, S.; Guitron, J.] Univ Cincinnati, Coll Med, Div Thorac Surg, Cincinnati, OH USA.
[Starnes, S.; Guitron, J.] Vet Affairs Med Ctr, Cincinnati, OH 45267 USA.
[Hanseman, D.] USAF, Ctr Sustainment Trauma & Readiness Skills, Cincinnati, OH USA.
[Hanseman, D.] Univ Cincinnati, Coll Med, Div Trauma & Crit Care, Cincinnati, OH USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0002-8614
J9 J AM GERIATR SOC
JI J. Am. Geriatr. Soc.
PD APR
PY 2013
VL 61
SU 1
SI SI
BP S229
EP S230
PG 2
WC Geriatrics & Gerontology; Gerontology
SC Geriatrics & Gerontology
GA 120QW
UT WOS:000317187600661
ER
PT J
AU Mackman, TJ
Allen, CB
Ghoreyshi, M
Badcock, KJ
AF Mackman, T. J.
Allen, C. B.
Ghoreyshi, M.
Badcock, K. J.
TI Comparison of Adaptive Sampling Methods for Generation of Surrogate
Aerodynamic Models
SO AIAA JOURNAL
LA English
DT Article; Proceedings Paper
CT 49th AIAA American Aerospace Sciences Meeting / New Horizons Forum and
Aerospace Exposition
CY JAN 03-07, 2011
CL Orlando, FL
SP AIAA
ID DESIGN; INTERPOLATION; OPTIMIZATION; SURFACES
AB A surrogate modeling strategy, using effective interpolation and sampling methods, facilitates a reduction in the number of computational fluid dynamics simulations required to construct an aerodynamic model to a specified accuracy. In this paper, two adaptive sampling strategies are compared for generating surrogate models, based on Kriging and radial basis function interpolation, respectively. The relationships between the two model formulations are discussed, and three test cases are considered, including analytic functions and recovery of aerodynamic coefficients for two example applications: longitudinal flight mechanics analysis for the DLR-F12 aircraft and structural loads analysis of an RAE2822 airfoil. For the airfoil example, models of C-L, C-D, and C-M were constructed with the two sampling strategies using Euler/boundary-layer-coupled computational fluid dynamics and a three-dimensional flight envelope of incidence, Mach, and Reynolds number. The two sampling approaches direct some samples toward exploration of the domain by minimizing model uncertainty and some toward refinement of local nonlinearities, by adapting to model curvature or extrema. The results provide some evidence that, for certain functions, in certain scenarios, each update scheme could be useful. Both methods were at least better than traditional space-filling sampling for all the test cases presented.
C1 [Mackman, T. J.; Allen, C. B.] Univ Bristol, Dept Aerosp Engn, Bristol BS8 1TR, Avon, England.
[Ghoreyshi, M.] USAF Acad, Colorado Springs, CO 80840 USA.
[Badcock, K. J.] Univ Liverpool, Sch Engn, Liverpool L69 3GH, Merseyside, England.
RP Mackman, TJ (reprint author), Univ Bristol, Dept Aerosp Engn, Bristol BS8 1TR, Avon, England.
NR 48
TC 5
Z9 5
U1 2
U2 25
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0001-1452
J9 AIAA J
JI AIAA J.
PD APR
PY 2013
VL 51
IS 4
BP 797
EP 808
DI 10.2514/1.J051607
PG 12
WC Engineering, Aerospace
SC Engineering
GA 115QP
UT WOS:000316827300004
ER
PT J
AU Swindeman, MJ
Iarve, EV
Brockman, RA
Mollenhauer, DH
Hallett, SR
AF Swindeman, Michael J.
Iarve, Endel V.
Brockman, Robert A.
Mollenhauer, David H.
Hallett, Stephen R.
TI Strength Prediction in Open Hole Composite Laminates by Using Discrete
Damage Modeling
SO AIAA JOURNAL
LA English
DT Article; Proceedings Paper
CT 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and
Materials Conference / 19th AIAA/ASME/AHS Adaptive Structures Conference
CY APR 04-07, 2011
CL Denver, CO
SP AIAA, ASME, ASCE, AHS, ASC
ID FINITE-ELEMENT-METHOD; TRANSVERSE CRACKING; NOTCHED COMPOSITES;
MATRIX-CRACKING; FAILURE; DELAMINATION; MECHANISMS
AB The present paper addresses the issue of direct simulation of complex local failure patterns in laminated composites. A model capable of the discrete modeling of matrix cracking, delamination, and the interaction of these two damage modes is proposed. The analytical technique develops the regularized extended finite element method for the simulation of matrix crack initiation and propagation at initially unknown locations, as well as a cohesive interface model for delamination. The regularized extended finite element method preserves the Gaussian integration schema in each element regardless of the enrichment required to model cracking and is capable of representing the complex kinematics of crack networks in composite laminates. The technique uses independently measured standard ply-level mechanical properties of the unidirectional composite (stiffness, strength, fracture toughness). Failure simulations of composites containing open holes are presented. Although the process of crack initiation is impossible to capture precisely due to local material variations the proposed method exhibits excellent agreement with experimental data for matrix and delamination crack growth in quasi-isotropic open hole graphite-epoxy composites with thick plies, where the composite fails in the delamination failure mode.
C1 [Swindeman, Michael J.; Iarve, Endel V.; Brockman, Robert A.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Mollenhauer, David H.] USAF, Res Lab, Composites & Hybrids Branch, Wright Patterson AFB, OH 45433 USA.
[Hallett, Stephen R.] Univ Bristol, Adv Composites Ctr Innovat & Sci, Bristol BS8 1TR, Avon, England.
RP Swindeman, MJ (reprint author), Univ Dayton, Res Inst, 300 Coll Pk Ave, Dayton, OH 45469 USA.
RI Hallett, Stephen/D-2573-2011
OI Hallett, Stephen/0000-0003-0751-8323
NR 35
TC 11
Z9 11
U1 2
U2 28
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0001-1452
J9 AIAA J
JI AIAA J.
PD APR
PY 2013
VL 51
IS 4
BP 936
EP 945
DI 10.2514/1.J051773
PG 10
WC Engineering, Aerospace
SC Engineering
GA 115QP
UT WOS:000316827300015
ER
PT J
AU Miller, SC
Baktash, SH
Webb, TS
Whitehead, CR
Maynard, C
Wells, TS
Otte, CN
Gore, RK
AF Miller, Shannon C.
Baktash, Suzanne H.
Webb, Timothy S.
Whitehead, Casserly R.
Maynard, Charles
Wells, Timothy S.
Otte, Clifford N.
Gore, Russel K.
TI Risk for Addiction-Related Disorders Following Mild Traumatic Brain
Injury in a Large Cohort of Active-Duty US Airmen
SO AMERICAN JOURNAL OF PSYCHIATRY
LA English
DT Article
ID ALCOHOL-USE; SUBSTANCE-ABUSE; HEAD-INJURY; DRUG-USE; AFGHANISTAN;
DEPRESSION; IRAQ; POPULATION; PATTERNS; CARE
AB Objective: Military personnel are at increased risk for traumatic brain injury (TBI) from combat and noncombat exposures. The sequelae of moderate to severe TBI are well described, but little is known regarding long-term performance decrements associated with mild TBI. Furthermore, while alcohol and drug use are well known to increase risk for TBI, little is known regarding the reverse pattern. The authors sought to assess possible associations between mild TBI and addiction-related disorders in active-duty U.S. military personnel.
Method: A historical prospective study was conducted using electronically recorded demographic, medical, and military data for more than a half million active-duty U.S. Air Force service members. Cases were identified by ICD-9-CM codes considered by an expert panel to be indicative of mild TBI. Outcomes included ICD-9-CM diagnoses of selected addiction-related disorders. Cox proportional hazards modeling was used to calculate hazard ratios while controlling for varying lengths of follow-up and potential confounding variables.
Results: Airmen with mild TBI were at increased risk for certain addiction-related disorders compared with a similarly injured non-mild TBI comparison group. Hazards for alcohol dependence, nicotine dependence, and nondependent abuse of drugs or alcohol were significantly elevated, with a consistent decrease over time.
Conclusions: A novel finding of this study was the initial increased risk for addiction-related disorders that decreased with time, thus eroding war fighter performance in a military population. Moreover, these results suggest that mild TBI is distinguished from moderate to severe TBI in terms of timing of the risk, indicating that there is a need for screening and prevention of addiction-related disorders in mild TBI. Screening may be warranted in military troops as well as civilians at both short- and long-term milestones following mild TBI. (Am J Psychiatry 2013; 170:383-390)
C1 [Whitehead, Casserly R.] Vet Affairs Med Ctr, Cincinnati, OH 45267 USA.
Univ Cincinnati, Dept Psychiat & Behav Neurosci, Ctr Treatment Res & Educ Addict Disorders, Cincinnati, OH USA.
Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN USA.
USAF, Res Lab, Vulnerabil Anal Branch, AFMC Human Performance Wing 711, Wright Patterson AFB, OH 45433 USA.
Infoscitex Corp, Waltham, MA USA.
VA Puget Sound, Epidemiol Res & Informat Ctr, Seattle, WA USA.
Emory Univ, Sch Med, Dept Neurol, Atlanta, GA 30322 USA.
RP Whitehead, CR (reprint author), Vet Affairs Med Ctr, Cincinnati, OH 45267 USA.
EM casserly.whitehead.ctr@wpafb.af.mil
RI Maynard, Charles/N-3906-2015; Gore, Russell/N-8988-2016
OI Maynard, Charles/0000-0002-1644-7814; Gore, Russell/0000-0002-8012-1579
NR 37
TC 15
Z9 17
U1 1
U2 19
PU AMER PSYCHIATRIC PUBLISHING, INC
PI ARLINGTON
PA 1000 WILSON BOULEVARD, STE 1825, ARLINGTON, VA 22209-3901 USA
SN 0002-953X
J9 AM J PSYCHIAT
JI Am. J. Psychiat.
PD APR
PY 2013
VL 170
IS 4
BP 383
EP 390
DI 10.1176/appi.ajp.2012.12010126
PG 8
WC Psychiatry
SC Psychiatry
GA 117AW
UT WOS:000316925500008
PM 23429886
ER
PT J
AU Jenkins, JH
Fischbach, E
Javorsek, D
Lee, RH
Sturrock, PA
AF Jenkins, J. H.
Fischbach, E.
Javorsek, D., II
Lee, R. H.
Sturrock, P. A.
TI Concerning the time dependence of the decay rate of (CS)-C-137
SO APPLIED RADIATION AND ISOTOPES
LA English
DT Article
DE Radioactivity; Beta decay; Sun; Neutrinos
ID NUCLEAR-DATA SHEETS; POWER SPECTRUM ANALYSIS; NEUTRON-ACTIVATION
ANALYSIS; HALF-LIFE MEASUREMENTS; SOLAR INFLUENCE; FREQUENCY-ANALYSIS;
SPACED DATA; BETA-DECAY; PERTURBATION; COUNTER
AB The decay rates of eight nuclides (Kr-85, Sr-90, Ag-108, Ba-133, Cs-137, Eu-152, Eu-154, and Ra-226) were monitored by the standards group at the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany, over the time frame June 1999 to November 2008. We find that the PTB measurements of the decay rate of Cs-137 show no evidence of an annual oscillation, in agreement with the recent report by Bellotti et al. However, power spectrum analysis of PTB measurements of a Ba-133 standard, measured in the same detector system, does show such evidence. This result is consistent with our finding that different nuclides have different sensitivities to whatever external influences are responsible for the observed periodic variations. (c) 2012 Elsevier Ltd. All rights reserved.
C1 [Jenkins, J. H.] Purdue Univ, Sch Nucl Engn, W Lafayette, IN 47907 USA.
[Jenkins, J. H.; Fischbach, E.] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA.
[Javorsek, D., II] AF Test Ctr, Edwards AFB, CA 93524 USA.
[Lee, R. H.] USAF Acad, Dept Phys, Usafa, CO 80840 USA.
[Sturrock, P. A.] Stanford Univ, Ctr Space Sci & Astrophys, Stanford, CA 94305 USA.
RP Jenkins, JH (reprint author), Purdue Univ, Sch Nucl Engn, W Lafayette, IN 47907 USA.
EM jere@purdue.edu
OI Javorsek, Daniel/0000-0002-0329-4011
NR 49
TC 7
Z9 7
U1 2
U2 22
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0969-8043
J9 APPL RADIAT ISOTOPES
JI Appl. Radiat. Isot.
PD APR
PY 2013
VL 74
BP 50
EP 55
DI 10.1016/j.apradiso.2012.12.010
PG 6
WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology,
Nuclear Medicine & Medical Imaging
SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine &
Medical Imaging
GA 117UK
UT WOS:000316978400010
PM 23353092
ER
PT J
AU Ganguli, S
Roy, AK
Wheeler, R
Varshney, V
Du, F
Dai, LM
AF Ganguli, Sabyasachi
Roy, Ajit K.
Wheeler, Robert
Varshney, Vikas
Du, Feng
Dai, Liming
TI Superior thermal interface via vertically aligned carbon nanotubes grown
on graphite foils
SO JOURNAL OF MATERIALS RESEARCH
LA English
DT Article
ID ARCHITECTURES; ARRAYS; FILMS
AB In an attempt to study the thermal transport at the interface between nanotubes and graphene, vertically aligned multiwalled carbon nanotubes (CNTs) were grown on graphite thin film substrates. A systematic cross-sectional probing of the materials' morphology of the interface by scanning electron microscopy and high-resolution transmission electron microscopy revealed that an excellent bond existed between the nanotubes and the substrate along some fraction of interface. Imaging and electron diffraction analyses performed at the boundary reveal a polycrystalline interfacial structure. Compositional probing along the interface by energy dispersive x-ray spectroscopy revealed that there were no catalyst particles or other impurities present. The estimated interfacial thermal resistance of lower than 5-7.5 (mm(2) K)/W suggests that this type of CNT/graphite interface could open up multiple routes toward the designing and development of advanced thermal interface materials for aerospace and nano-/microelectronics applications.
C1 [Ganguli, Sabyasachi; Roy, Ajit K.; Varshney, Vikas] USAF, Res Lab, Nanoelect Mat Branch, Mat & Mfg Directorate, Dayton, OH 45433 USA.
[Ganguli, Sabyasachi] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Wheeler, Robert] Universal Energy Syst Inc, Dayton, OH 45432 USA.
[Varshney, Vikas] Univ Technol Corp, Dayton, OH 45432 USA.
[Du, Feng; Dai, Liming] Case Western Reserve Univ, Dept Chem Engn, Cleveland, OH 44106 USA.
RP Ganguli, S (reprint author), USAF, Res Lab, Nanoelect Mat Branch, Mat & Mfg Directorate, Dayton, OH 45433 USA.
EM sabyasachi.ganguli@wpafb.af.mil
FU U.S. Air Force [FA8650-05-5052]; Air Force Office of Scientific Research
[Task 2302BR7P]
FX S.G. acknowledges support through U.S. Air Force Contract No.
FA8650-05-5052. Authors also acknowledge additional support from Air
Force Office of Scientific Research (Task 2302BR7P, Program manager: Dr.
Byung-Lip Lee).
NR 16
TC 3
Z9 3
U1 1
U2 35
PU CAMBRIDGE UNIV PRESS
PI NEW YORK
PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA
SN 0884-2914
J9 J MATER RES
JI J. Mater. Res.
PD APR
PY 2013
VL 28
IS 7
BP 933
EP 939
DI 10.1557/jmr.2012.401
PG 7
WC Materials Science, Multidisciplinary
SC Materials Science
GA 116XR
UT WOS:000316917100005
ER
PT J
AU Stanford, MS
Benson, LC
Alluri, P
Martin, WD
Klotz, LE
Ogle, JH
Kaye, N
Sarasua, W
Schiff, S
AF Stanford, M. Scott
Benson, Lisa C.
Alluri, Priyanka
Martin, William D.
Klotz, Leidy E.
Ogle, Jennifer H.
Kaye, Nigel
Sarasua, Wayne
Schiff, Scott
TI Evaluating Student and Faculty Outcomes for a Real-World Capstone
Project with Sustainability Considerations
SO JOURNAL OF PROFESSIONAL ISSUES IN ENGINEERING EDUCATION AND PRACTICE
LA English
DT Article
DE Capstone; Sustainability; Real-world project; Critical thinking;
Integrative thinking; Student workload; Faculty workload; Jigsaw team;
Community-based project; Undergraduate engineering education
ID ENGINEERING-EDUCATION; DESIGN EXPERIENCE; AGREEMENT
AB The purpose of this study was to determine how a real-world, sustainability-focused engineering capstone course affected students' critical thinking skills, student knowledge of sustainability, and student and faculty workloads. The research also investigated the effectiveness of a classwide jigsaw team approach. A combination of qualitative and quantitative assessment tools, including surveys, journals, interviews, and timecards, was employed to investigate the research questions. Results revealed that a real-world project with a focus on sustainability positively impacted students' critical thinking skills and led to increased knowledge of sustainability, but it also correlated with a high workload for students and faculty. Additionally, the jigsaw organization structure proved successful and yielded a positive team-building experience for the students. These results suggest open-ended problems with real project constraints can yield a uniquely beneficial learning experience without sacrificing the quality of student design or project deliverables. DOI: 10.1061/(ASCE)EI.1943-5541.0000141. (C) 2013 American Society of Civil Engineers.
C1 [Stanford, M. Scott] USAF Acad, Dept Civil & Environm Engn, Usafa, CO 80840 USA.
[Benson, Lisa C.] Clemson Univ, Dept Engn & Sci Educ, Clemson, SC 29634 USA.
[Alluri, Priyanka] Florida Int Univ, Lehman Ctr Transportat Res, Miami, FL 33174 USA.
[Martin, William D.; Klotz, Leidy E.; Ogle, Jennifer H.; Kaye, Nigel; Sarasua, Wayne; Schiff, Scott] Clemson Univ, Glenn Dept Civil Engn, Clemson, SC 29634 USA.
RP Stanford, MS (reprint author), USAF Acad, Dept Civil & Environm Engn, 2354 Fairchild Dr,Suite 6J-159, Usafa, CO 80840 USA.
EM matthew.stanford@usafa.edu; lbenson@clemson.edu; palluri@fiu.edu;
wmartin@g.clemson.edu; leidyk@clemson.edu; ogle@clemson.edu;
nbkaye@clemson.edu; sarasua@clemson.edu; schiffs@clemson.edu
OI Kaye, Nigel/0000-0001-7190-7791
NR 48
TC 0
Z9 0
U1 0
U2 18
PU ASCE-AMER SOC CIVIL ENGINEERS
PI RESTON
PA 1801 ALEXANDER BELL DR, RESTON, VA 20191-4400 USA
SN 1052-3928
J9 J PROF ISS ENG ED PR
JI J. Prof. Issues Eng. Educ. Pract.
PD APR
PY 2013
VL 139
IS 2
BP 123
EP 133
DI 10.1061/(ASCE)EI.1943-5541.0000141
PG 11
WC Education, Scientific Disciplines; Engineering, Multidisciplinary
SC Education & Educational Research; Engineering
GA 113WN
UT WOS:000316700200006
ER
PT J
AU Inn, KGW
Johnson, CM
Oldham, W
Jerome, S
Tandon, L
Schaaff, T
Jones, R
Mackney, D
MacKill, P
Palmer, B
Smith, D
LaMont, S
Griggs, J
AF Inn, Kenneth G. W.
Johnson, C. Martin, Jr.
Oldham, Warren
Jerome, Simon
Tandon, Lav
Schaaff, Thomas
Jones, Robert
Mackney, Daniel
MacKill, Pam
Palmer, Brett
Smith, Donna
LaMont, Stephen
Griggs, John
TI The urgent requirement for new radioanalytical certified reference
materials for nuclear safeguards, forensics, and consequence management
SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
LA English
DT Article
DE Reference materials; Metrology; Nuclear; Safeguards; Post-detonation;
Detecting technologies; Consequence management
AB A multi-agency workshop was held from 25 to 27 August 2009, at the National Institute of Standards and Technology (NIST), to identify and prioritize the development of radioanalytical Certified Reference Materials (CRMs, generally provided by National Metrology Institutes; Standard Reference Materials, a CRM issued by NIST) for field and laboratory nuclear measurement methods to be used to assess the consequences of a domestic or international nuclear event. Without these CRMs, policy makers concerned with detecting proliferation and trafficking of nuclear materials, attribution and retribution following a nuclear event, and public health consequences of a nuclear event would have difficulty making decisions based on analytical data that would stand up to scientific, public, and judicial scrutiny. The workshop concentrated on three areas: post-incident Improvised Nuclear Device (IND) nuclear forensics, safeguard materials characterization, and consequence management for an IND or a Radiological Dispersion Device detonation scenario. The workshop identified specific CRM requirements to fulfill the needs for these three measurement communities. Of highest priority are: (1) isotope dilution mass spectrometry standards, specifically U-233, Np-236g, Pu-244, and Am-243, used for quantitative analysis of the respective elements that are in critically short supply and in urgent need of replenishment and certification; (2) CRMs that are urgently needed for post-detonation debris analysis of actinides and fission fragments, and (3) CRMs used for destructive and nondestructive analyses for safeguards measurements, and radioisotopes of interest in environmental matrices.
C1 [Inn, Kenneth G. W.] NIST, Gaithersburg, MD 20899 USA.
[Johnson, C. Martin, Jr.] USAF, San Antonio, TX USA.
[Oldham, Warren; Tandon, Lav; Smith, Donna; LaMont, Stephen] Los Alamos Natl Lab, Los Alamos, NM USA.
[Jerome, Simon] Natl Phys Lab, London, England.
[Schaaff, Thomas] Y12 Natl Secur Complex, Oak Ridge, TN USA.
[Jones, Robert] Ctr Dis Control & Prevent, NCEH, Atlanta, GA USA.
[Mackney, Daniel; Griggs, John] US EPA, NAREL, Montgomery, AL USA.
[MacKill, Pam] US FDA, WEAC, Winchester, MA USA.
[Palmer, Brett] Navarro Res & Engn Inc, Oak Ridge, TN USA.
RP Inn, KGW (reprint author), NIST, 100 Bur Dr,MS 8462, Gaithersburg, MD 20899 USA.
EM kenneth.inn@nist.gov
OI Oldham, Warren/0000-0002-0997-2653
NR 19
TC 11
Z9 11
U1 2
U2 32
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0236-5731
J9 J RADIOANAL NUCL CH
JI J. Radioanal. Nucl. Chem.
PD APR
PY 2013
VL 296
IS 1
BP 5
EP 22
DI 10.1007/s10967-012-1972-y
PG 18
WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science &
Technology
SC Chemistry; Nuclear Science & Technology
GA 112CM
UT WOS:000316569600003
ER
PT J
AU Perry, MB
Mercado, GR
Simpson, JR
AF Perry, Marcus B.
Mercado, Gary R.
Simpson, James R.
TI On the Analysis of Balanced Two-Level Factorial Whole-Plot Saturated
Split-Plot Designs
SO QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL
LA English
DT Article
DE design of experiments; limited resources; randomization restrictions;
split-plot design
ID RESTRICTED MAXIMUM-LIKELIHOOD; INFERENCE; VARIANCE
AB This paper considers an experimentation strategy when resource constraints permit only a single design replicate per time interval and one or more design variables are hard to change. The experimental designs considered are two-level full-factorial or fractional-factorial designs run as balanced split plots. These designs are common in practice and appropriate for fitting a main-effects-plus-interactions model, while minimizing the number of times the whole-plot treatment combination is changed. Depending on the postulated model, single replicates of these designs can result in the inability to estimate error at the whole-plot level, suggesting that formal statistical hypothesis testing on the whole-plot effects is not possible. We refer to these designs as balanced two-level whole-plot saturated split-plot designs. In this paper, we show that, for these designs, it is appropriate to use ordinary least squares to analyze the subplot factor effects at the intermittent' stage of the experiments (i.e., after a single design replicate is run); however, formal inference on the whole-plot effects may or may not be possible at this point. We exploit the sensitivity of ordinary least squares in detecting whole-plot effects in a split-plot design and propose a data-based strategy for determining whether to run an additional replicate following the intermittent analysis or whether to simply reduce the model at the whole-plot level to facilitate testing. The performance of the proposed strategy is assessed using Monte Carlo simulation. The method is then illustrated using wind tunnel test data obtained from a NASCAR Winston Cup Chevrolet Monte Carlo stock car. Copyright (c) 2012 John Wiley & Sons, Ltd.
C1 [Perry, Marcus B.; Mercado, Gary R.] Univ Alabama, Dept Informat Syst Stat & Management Sci, Tuscaloosa, AL 35487 USA.
[Simpson, James R.] USAF, Grp OA, Test Management Grp 53, Eglin AFB, FL 32542 USA.
RP Perry, MB (reprint author), Univ Alabama, Dept Informat Syst Stat & Management Sci, 300 Alston Hall,Box 870226, Tuscaloosa, AL 35487 USA.
EM mperry@cba.ua.edu
FU Summer Excellence in Research Program (SEiRP) at The University of
Alabama's Culverhouse College of Commerce and Business Administration
FX Marcus B. Perry and Gary R. Mercado acknowledge the support through the
Summer Excellence in Research Program (SEiRP) at The University of
Alabama's Culverhouse College of Commerce and Business Administration.
NR 10
TC 0
Z9 0
U1 0
U2 11
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0748-8017
J9 QUAL RELIAB ENG INT
JI Qual. Reliab. Eng. Int.
PD APR
PY 2013
VL 29
IS 3
BP 327
EP 343
DI 10.1002/qre.1384
PG 17
WC Engineering, Multidisciplinary; Engineering, Industrial; Operations
Research & Management Science
SC Engineering; Operations Research & Management Science
GA 112YX
UT WOS:000316632600004
ER
PT J
AU Mahalingam, K
Haugan, HJ
Brown, GJ
Eyink, KG
AF Mahalingam, Krishnamurthy
Haugan, Heather J.
Brown, Gail J.
Eyink, Kurt G.
TI Quantitative analysis of interfacial strain in InAs/GaSb superlattices
by aberration-corrected HRTEM and HAADF-STEM
SO ULTRAMICROSCOPY
LA English
DT Article; Proceedings Paper
CT 13th Meeting on Frontiers of Electron Microscopy in Materials Science
(FEMMS)
CY SEP 18-23, 2011
CL Rohnert Park, CA
SP Natl Nucl Secur Adm, Lawrence Livermore Natl Lab, Oak Ridge Natl Lab, Pacific NW Natl Lab, Hysitron Inc, FEI Co, Sandia Natl Lab, Los Almos Natl Lab, Gatan, JEOL
DE Strain Mapping; High-resolution transmission electron microscopy
(HRTEM); Scanning transmission electron microscopy (STEM); Interfaces;
InAs/GaSb; superlattices
ID TRANSMISSION ELECTRON-MICROSCOPY; MOLECULAR-BEAM EPITAXY; SEMICONDUCTOR
INTERFACES; QUANTUM-WELLS; IMAGES; SEGREGATION; DETECTORS; GROWTH;
LASERS; HREM
AB The strain distribution across interfaces in InAs/GaSb superlattices grown on (100)-GaSb substrates is investigated by aberration corrected transmission electron microscopy. Atomic resolution images of interfaces were obtained by conventional high resolution transmission electron microscopy (HRTEM), using the negative spherical-aberration imaging mode, and by scanning transmission electron microscopy (STEM), using the high-angle annular dark-field (HAADF) imaging mode. The local atomic displacements across interfaces were determined from these images using the peak pair algorithm, from which strain maps were calculated with respect to a reference lattice extracted from the GaSb substrate region. Both techniques yield consistent results, which reveal that the InAs-on-GaSb interface is nearly strain balanced, whereas the GaSb-on-InAs interface is in tensile strain, indicating that the prevalent bond type at this interface is Ga-As. In addition, the GaSb layers in the superlattice are compressively strained indicating the incorporation of In into these layers. Further analysis of the HAADF-STEM images indicates an estimated 4% In content in the GaSb layers and that the GaSb-on-InAs interface contributes to about 27% of the overall superlattice strain. The strain measurements in the InAs layers are in good agreement with the theoretical values determined from elastic constants. Furthermore, the overall superlattice strain determined from this analysis is also in good agreement with the measurements determined by high-resolution X-ray diffraction. (c) 2012 Elsevier B.V. All rights reserved.
C1 [Mahalingam, Krishnamurthy; Haugan, Heather J.; Brown, Gail J.; Eyink, Kurt G.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Mahalingam, K (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Krishnamurthy.Mahalingam.ctr@wpafb.af.mil
RI Foundry, Molecular/G-9968-2014
NR 32
TC 15
Z9 15
U1 0
U2 71
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0304-3991
J9 ULTRAMICROSCOPY
JI Ultramicroscopy
PD APR
PY 2013
VL 127
BP 70
EP 75
DI 10.1016/j.ultramic.2012.09.005
PG 6
WC Microscopy
SC Microscopy
GA 113IF
UT WOS:000316659100011
PM 23298538
ER
PT J
AU Kramb, RC
Ward, LT
Jensen, KE
Vaia, RA
Miracle, DB
AF Kramb, R. C.
Ward, L. T.
Jensen, K. E.
Vaia, R. A.
Miracle, D. B.
TI The structure of Cu-Zr glasses using a colloidal proxy system
SO ACTA MATERIALIA
LA English
DT Article
DE Metallic glasses; Colloidal glasses; Amorphous materials; Glass
structure
ID METALLIC GLASSES; ALLOYS
AB We present a novel experimental technique for studying the structure of metallic glasses (specifically Cu-Zr) through a proxy system of charged colloidal particles. A dense suspension of two types of colloidal particles that match the relative size ratio and approximate the attractive interaction of Cu and Zr atoms is created. Confocal microscopy images are analyzed to find the location of tens of thousands of particles at each composition studied. The particle locations are used to determine the packing fraction, partial radial distribution functions and partial coordination numbers of each component as well as the shape of clusters (central atom and first shell neighbors) that form. These results are compared to experimental and simulation literature on Cu-Zr systems, with good agreement found among all structural properties. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Kramb, R. C.; Vaia, R. A.; Miracle, D. B.] USAF, Res Lab, AFRL RX Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Kramb, R. C.] CNR, Washington, DC 20001 USA.
[Ward, L. T.] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA.
[Jensen, K. E.] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA.
RP Kramb, RC (reprint author), USAF, Res Lab, AFRL RX Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM ryan.kramb.ctr@wpafb.af.mil
OI Ward, Logan/0000-0002-1323-5939
FU Air Force Office of Scientific Research; National Research Council,
Washington, DC [F49620-02-C-0015]
FX The authors thank Tom Kodger for discussions on particle synthesis,
surface charge and solvent choice. We also thank David Weitz and Frans
Spaepen for discussion and access to their resources. Work at the Air
Force Research Laboratory was supported through the Air Force Office of
Scientific Research and under on-site Contract No. F49620-02-C-0015
conducted through the National Research Council, Washington, DC.
NR 21
TC 2
Z9 2
U1 1
U2 29
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD APR
PY 2013
VL 61
IS 6
BP 2025
EP 2032
DI 10.1016/j.actamat.2012.12.022
PG 8
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 107SP
UT WOS:000316241400019
ER
PT J
AU Patterson, RE
Pierce, BJ
Boydstun, AS
Ramsey, LM
Shannan, J
Tripp, L
Bell, H
AF Patterson, Robert Earl
Pierce, Byron J.
Boydstun, Alan S.
Ramsey, Lisa M.
Shannan, Jodi
Tripp, Lisa
Bell, Herb
TI Training Intuitive Decision Making in a Simulated Real-World Environment
SO HUMAN FACTORS
LA English
DT Article
DE intuitive decision making; pattern recognition; implicit learning;
artificial grammar learning; immersive environment
ID IMPLICIT; MEMORY; SYSTEMS; INFORMATION; FRAMEWORK; COGNITION; GRAMMARS;
ACCOUNTS; BRAIN
AB Objective: We investigated whether naturalistic, intuitive (pattern recognition-based) decision making can be developed via implicit statistical learning in a simulated real-world environment.
Background: To our knowledge, no definitive studies have actually shown that implicit learning plays a causal role in the development of intuitive decision making when the latter is defined as pattern recognition of real-world, or simulated real-world, environmental situations.
Method: The simulated environment was presented dynamically so as to induce a sense of simulated locomotion through the scene and over sequences of objects on the ground. During training, participants passively viewed the objects sequences; during test, participants made intuitive decisions about related or unrelated sequences.
Results: Intuitive decision making can be developed via implicit learning. Articulatory suppression, which affects working memory, exerted a significant inhibitory effect on the training of intuitive decision making. Intuitive decision making trained in the simulated environment fully transferred to a flat display (but not vice versa).
Conclusion: Intuitive decision making is developed by an implicit learning process that is engaged by the meaning inherent in naturalistic scenes.
Application: Implicit learning can be used for training intuitive decision making.
C1 [Patterson, Robert Earl] USAF, Res Lab, Human Analyst Augmentat Branch, Human Ctr ISR Div, Wright Patterson AFB, OH 45433 USA.
[Pierce, Byron J.] Renaissance Sci Corp, Training Syst Anal, Chandler, AZ USA.
[Boydstun, Alan S.; Ramsey, Lisa M.; Shannan, Jodi] L3 Commun, Mesa, AZ USA.
[Tripp, Lisa; Bell, Herb] USAF, Res Lab, Mesa, AZ USA.
RP Patterson, RE (reprint author), USAF, Res Lab, RHA-711 HPW, Wright Patterson AFB, OH 45433 USA.
EM Robert.Patterson@wpafb.af.mil
FU U.S. Air Force [FA8650-05-D6502]; AFOSR [11RH08COR]
FX This work was supported by U.S. Air Force Contract FA8650-05-D6502, Task
Order 0037, to Link Simulation and Training, L3 Communications. This
research was also supported by AFOSR grant # 11RH08COR. The views
expressed in this article are those of the authors and do not reflect
the official policy or position of the Department of Defense or the U.S.
government. This article has been cleared for public release.
NR 43
TC 3
Z9 3
U1 0
U2 20
PU SAGE PUBLICATIONS INC
PI THOUSAND OAKS
PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA
SN 0018-7208
J9 HUM FACTORS
JI Hum. Factors
PD APR
PY 2013
VL 55
IS 2
BP 333
EP 345
DI 10.1177/0018720812454432
PG 13
WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology,
Applied; Psychology
SC Behavioral Sciences; Engineering; Psychology
GA 112YY
UT WOS:000316632700008
PM 23691829
ER
PT J
AU De, S
Gupta, K
Stanley, RJ
Ghasr, MT
Zoughi, R
Doering, K
Van Aken, DC
Steffes, G
O'Keefe, M
Palmer, DD
AF De, Soumya
Gupta, Kapil
Stanley, R. Joe
Ghasr, Mohammad T.
Zoughi, Reza
Doering, Kenneth
Van Aken, David C.
Steffes, Gary
O'Keefe, Matt
Palmer, Donald D., Jr.
TI A Comprehensive Multi-Modal NDE Data Fusion Approach for Failure
Assessment in Aircraft Lap-Joint Mimics
SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
LA English
DT Article
DE Eddy Current (EC); ultrasound; microwave; millimeter wave (MW);
structural health monitoring; structural analysis; fatigue; image
analysis; multi-modal data fusion; non-destructive evaluation (NDE)
ID EDDY-CURRENT DATA; CORROSION; PAINT; MICROWAVE
AB Multi-modal data fusion techniques are commonly used to enhance decision-making processes. In previous research, a comprehensive structural analysis process was developed for quantizing and evaluating characteristics of defects in aircraft lap-joint mimics using eddy current (EC) nondestructive evaluation (NDE) data collected for structural health monitoring. In this research, a comprehensive multi-modal structural analysis process is presented that includes intra-and inter-modal NDE data fusion based on EC, millimeter wave (MW), and ultrasonic (UT) data obtained from five lap-joint mimic test panels. The process includes defect detection, defect characterization, and finite-element modeling-based simulated fatigue loading for structural analysis. The multi-modal structural analysis process is evaluated using four test panels with corroded patches at different layers of the lap joints and one painted pristine panel used as a reference. The test panels are subjected to two rounds of mechanical loading, preceded by multi-modal NDE data obtained before each round. Different NDE modality combinations are examined for test panel modeling, including: 1) EC, 2) UT, 3) MW, 4) EC and UT, 5) EC and MW, and 6) EC, UT, and MW. Experiments are performed to compare the simulated fatigue loading, based on models determined from the different modality combinations, and the mechanical loading results to find susceptible-to-failure areas in the test panels. Experimental results showed that the EC and UT modality combination yielded a correct vulnerable (crack) location recognition rate of 98.8%, an improvement of 14.7% over any individual modality, demonstrating the potential for multi-modal data fusion for characterizing corrosion and defects.
C1 [De, Soumya; Stanley, R. Joe; Ghasr, Mohammad T.; Zoughi, Reza] Missouri Univ Sci & Technol S&T, Dept Elect & Comp Engn, Rolla, MO 65409 USA.
[Gupta, Kapil] Coherix Inc, Ann Arbor, MI USA.
[Doering, Kenneth; Van Aken, David C.; O'Keefe, Matt] Missouri Univ Sci & Technol S&T, Dept Mat Sci & Engn, Rolla, MO 65409 USA.
[Steffes, Gary] USAF, Res Lab AFRL, Wright Patterson AFB, OH 45433 USA.
[Palmer, Donald D., Jr.] Boeing Co, Boeing Phantom Works, St Louis, MO 63166 USA.
RP De, S (reprint author), Missouri Univ Sci & Technol S&T, Dept Elect & Comp Engn, Rolla, MO 65409 USA.
FU Air Force Research Laboratory (AFRL) [FA8650-04-C-5704]; Center for
Aerospace Manufacturing Technologies
FX Manuscript received July 10, 2012; revised December 13, 2012; accepted
December 30, 2012. Date of publication February 15, 2013; date of
current version March 8, 2013. This work was supported in part by the
Air Force Research Laboratory (AFRL) under contract FA8650-04-C-5704 in
conjunction with the Center for Aerospace Manufacturing Technologies.
The Associate Editor coordinating the review process for this paper was
Robert Gao.
NR 31
TC 2
Z9 2
U1 3
U2 22
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9456
J9 IEEE T INSTRUM MEAS
JI IEEE Trans. Instrum. Meas.
PD APR
PY 2013
VL 62
IS 4
BP 814
EP 827
DI 10.1109/TIM.2013.2240931
PG 14
WC Engineering, Electrical & Electronic; Instruments & Instrumentation
SC Engineering; Instruments & Instrumentation
GA 107YF
UT WOS:000316256200014
ER
PT J
AU Stahler, AC
Monahan, JL
Dagher, JM
Baker, JD
Markopoulos, MM
Iragena, DB
NeJame, BM
Slaughter, R
Felker, D
Burggraf, LW
Isaac, LAC
Grossie, D
Gagnon, ZE
Sizemore, IEP
AF Stahler, Adam C.
Monahan, Jennifer L.
Dagher, Jessica M.
Baker, Joshua D.
Markopoulos, Marjorie M.
Iragena, Diane B.
NeJame, Britney M.
Slaughter, Robert
Felker, Daniel
Burggraf, Larry W.
Isaac, Leon A. C.
Grossie, David
Gagnon, Zofia E.
Sizemore, Ioana E. Pavel
TI Evaluating the abnormal ossification in tibiotarsi of developing chick
embryos exposed to 1.0 ppm doses of platinum group metals by
spectroscopic techniques
SO BONE
LA English
DT Article
DE Chick embryo tibiotarsi; Platinum group metals; Micro-Raman imaging;
Micro-XRF imaging; FAAS; Histology
ID MODEL SYSTEM; BONE; PALLADIUM; RHODIUM; RAMAN; SOILS; CONTAMINATION;
PHOSPHATE; ROADS; DIET
AB Platinum group metals (PGMs), i.e., palladium (Pd), platinum (Pt) and rhodium (Rh), are found at pollutant levels in the environment and are known to accumulate in plant and animal tissues. However, little is known about PGM toxicity. Our previous studies showed that chick embryos exposed to PGM concentrations of 1 mL of 5.0 ppm (LD50) and higher exhibited severe skeletal deformities. This work hypothesized that 1.0 ppm doses of PGMs will negatively impact the mineralization process in tibiotarsi. One milliliter of 1.0 ppm of Pd(II), Pt(IV), Rh(III) aqueous salt solutions and a PGM-mixture were injected into the air sac on the 7th and 14th day of incubation. Control groups with no-injection and vehicle injections were included. On the 20th day, embryos were sacrificed to analyze the PGM effects on tibiotarsi using four spectroscopic techniques. 1) Micro-Raman imaging: Hyperspectral Raman data were collected on paraffin embedded cross-sections of tibiotarsi, and processed using in-house-written MATLAB codes. Micro-Raman univariate images that were created from the v(1)(PO43-) integrated areas revealed anomalous mineral inclusions within the bone marrow for the PGM-mixture treatment. The age of the mineral crystals (v(CO32-)/v(1)(PO43-)) was statistically lower for all treatments when compared to controls (p <= 0.05). 2) FAAS: The percent calcium content of the chemically digested tibiotarsi in the Pd and Pt groups changed by -45% with respect to the no-injection control (16.1 +/- 0.2%). 3) Micro-XRF imaging: Abnormal calcium and phosphorus inclusions were found within the inner longitudinal sections of tibiotarsi for the PGM-mixture treatment. A clear increase in the mineral content was observed for the outer sections of the Pd treatment. 4) ICP-OES: PGM concentrations in tibiotarsi were undetectable (<5 ppb). The spectroscopic techniques gave corroborating results, confirmed the hypothesis, and explained the observed pathological (skeletal developmental abnormalities) and histological changes (tibiotarsus ischemia and nuclear fragmentation in chondrocytes). (C) 2013 Elsevier Inc. All rights reserved.
C1 [Stahler, Adam C.; Monahan, Jennifer L.; Dagher, Jessica M.; Baker, Joshua D.; Markopoulos, Marjorie M.; Iragena, Diane B.; Grossie, David; Sizemore, Ioana E. Pavel] Wright State Univ, Dept Chem, Dayton, OH 45435 USA.
[NeJame, Britney M.; Gagnon, Zofia E.] Marist Coll, Dept Environm Sci & Policy, Poughkeepsie, NY 12601 USA.
[Slaughter, Robert; Felker, Daniel; Burggraf, Larry W.] USAF, Inst Technol, Dayton, OH 45433 USA.
[Isaac, Leon A. C.] St Francis Hosp, Dept Pathol, Poughkeepsie, NY 12601 USA.
RP Gagnon, ZE (reprint author), Marist Coll, Dept Environm Sci & Policy, 3399 North Rd, Poughkeepsie, NY 12601 USA.
EM zofia.gagnon@marist.edu; ioana.pavel@wright.edu
OI Felker, Daniel/0000-0002-7196-3758
FU WSU; Hudson River Foundation through the Tibor T. Polgar Fellowship
FX This work was supported by WSU start-up funds and the Hudson River
Foundation through the Tibor T. Polgar Fellowship. Joseph G. Solch's and
Garrett Van Ness's assistance with the FAAS and ICP-OES measurements at
WSU is highly appreciated. Joseph Conetta, Ph.D. (New York Medical
College at Valhalla), Michael C. McGinnis, M.D. (Pathology Corporation
of America), and undergraduate students (biology seniors at Marist
College), Jason Wickman and Anne Quach Chau, are highly acknowledged for
their help with the analysis of the chondrocyte cell development.
NR 44
TC 3
Z9 3
U1 1
U2 23
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 8756-3282
J9 BONE
JI Bone
PD APR
PY 2013
VL 53
IS 2
BP 421
EP 429
DI 10.1016/j.bone.2012.12.051
PG 9
WC Endocrinology & Metabolism
SC Endocrinology & Metabolism
GA 101GR
UT WOS:000315763700013
PM 23313279
ER
PT J
AU Starman, LA
Coutu, RA
AF Starman, L. A.
Coutu, R. A., Jr.
TI Using Micro-Raman Spectroscopy to Assess MEMS Si/SiO2 Membranes
Exhibiting Negative Spring Constant Behavior
SO EXPERIMENTAL MECHANICS
LA English
DT Article
DE Negative stiffness; Micro-Raman spectroscopy; Residual stress; MEMS;
Hookean
ID POROUS SILICON; SENSITIVITY ENHANCEMENT; POLYCRYSTALLINE SILICON;
LOAD-DEFLECTION; THIN-FILMS; STRESS; SENSORS
AB We introduce a novel micro-mechanical structure that exhibits two regions of stable linear positive and negative stiffness. Springs, cantilevers, beams and any other geometry that display an increasing return force that is proportional to the displacement can be considered to have a "Hookean" positive spring constant, or stiffness. Less well known is the opposite characteristic of a reducing return force for a given deflection, or negative stiffness. Unfortunately many simple negative stiffness structures exhibit unstable buckling and require additional moving components during deflection to avoid deforming out of its useful shape. In Micro-Electro-Mechanical Systems (MEMS) devices, buckling caused by stress at the interface of silicon and thermally grown SiO2 causes tensile and compressive forces that will warp structures if the silicon layer is thin enough. The 1 mm(2) membrane structures presented here utilizes this effect but overcome this limitation and empirically demonstrates linearity in both regions. The Si/SiO2 membranes presented deflect similar to 17 mu m from their pre-released position. The load deflection curves produced exhibit positive linear stiffness with an inflection point holding nearly constant with a slight negative stiffness. Depositing a 0.05 mu m titanium and 0.3 mu m layer of gold on top of the Si/SiO2 membrane reduces the initial deflection to similar to 13.5 mu m. However, the load deflection curve produced illustrates both a linear positive and negative spring constant with a fairly sharp inflection point. These results are potentially useful to selectively tune the spring constant of mechanical structures used in MEMS. The structures presented are manufactured using typical micromachining techniques and can be fabricated in-situ with other MEMS devices.
C1 [Starman, L. A.; Coutu, R. A., Jr.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Starman, LA (reprint author), USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM Lavern.Starman@afit.edu
RI Coutu, Ronald/I-7711-2014
NR 48
TC 1
Z9 1
U1 0
U2 26
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0014-4851
EI 1741-2765
J9 EXP MECH
JI Exp. Mech.
PD APR
PY 2013
VL 53
IS 4
BP 593
EP 604
DI 10.1007/s11340-012-9656-7
PG 12
WC Materials Science, Multidisciplinary; Mechanics; Materials Science,
Characterization & Testing
SC Materials Science; Mechanics
GA 105LG
UT WOS:000316070600007
ER
PT J
AU Kichambare, P
Rodrigues, S
AF Kichambare, Padmakar
Rodrigues, Stanley
TI Mesoporous Nitrogen-Doped Carbon-LiSICON Glass Ceramics as High
Performance Cathodes in Solid-State Lithium-Oxygen Batteries
SO ENERGY TECHNOLOGY
LA English
DT Article
DE batteries; carbon; glasses; mesoporous materials; oxygen reduction
ID AIR BATTERY; LI-O-2 BATTERY; ELECTROLYTE; CHALLENGES; LI2O2
C1 [Kichambare, Padmakar; Rodrigues, Stanley] Air Force Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
RP Kichambare, P (reprint author), Air Force Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
EM Padmakar.Kichambare@wpafb.af.mil
FU Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio
FX This research was supported by the Air Force Research Laboratory,
Wright-Patterson Air Force Base, Ohio. We thank Dr. B. Kumar at the
University of Dayton Research Institute, Dayton, Ohio, for supplying the
LAGP powder for this research work.
NR 18
TC 6
Z9 6
U1 5
U2 34
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY
SN 2194-4288
EI 2194-4296
J9 ENERGY TECHNOL-GER
JI Energy Technol.
PD APR
PY 2013
VL 1
IS 4
BP 209
EP 211
DI 10.1002/ente.201200028
PG 3
WC Energy & Fuels
SC Energy & Fuels
GA AK3SF
UT WOS:000338344300001
ER
PT J
AU Hollingsworth, JJ
Hare, JP
AF Hollingsworth, Jeffrey Jacob
Hare, Jean Paul
TI Managing Acute Suicidal Ideation in a Forward Deployed Location in
Afghanistan
SO MILITARY MEDICINE
LA English
DT Editorial Material
C1 [Hollingsworth, Jeffrey Jacob] Mental Hlth Flight, Randolph Afb, TX 78150 USA.
[Hare, Jean Paul] Dept Behav Hlth, Ft Carson, CA USA.
RP Hollingsworth, JJ (reprint author), Mental Hlth Flight, 359th Med Operations Squadron, Randolph Afb, TX 78150 USA.
NR 4
TC 0
Z9 0
U1 0
U2 0
PU ASSOC MILITARY SURG US
PI BETHESDA
PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 USA
SN 0026-4075
EI 1930-613X
J9 MIL MED
JI Milit. Med.
PD APR
PY 2013
VL 178
IS 4
BP 357
EP 358
DI 10.7205/MILMED-D-12-00425
PG 2
WC Medicine, General & Internal
SC General & Internal Medicine
GA AN7TY
UT WOS:000340805100001
PM 23707815
ER
PT J
AU Timpone, V
Schneider, BE
Sherman, PM
AF Timpone, Vincent
Schneider, Brett E.
Sherman, Paul M.
TI Screening CT Angiography for Detection of Blunt Carotid and Vertebral
Artery Injury in the Setting of Combat-Related Trauma
SO MILITARY MEDICINE
LA English
DT Article
ID COMPUTED TOMOGRAPHIC ANGIOGRAPHY; CEREBROVASCULAR INJURIES; DIAGNOSIS;
THERAPY
AB Blunt carotid and vertebral artery injury (BCVI) is a relatively rare injury reported in the civilian sector and is associated with high morbidity and mortality. The purpose of our study was to use an optimized computed tomography angiography protocol in the deployed setting to determine the prevalence of BCVI in a consecutive patient population having experienced recent wartime-related traumatic injuries. From July 2008 to September 2009, a total of 307 consecutive trauma patients were included in this study. At least 233 (76%) patients were known to have experienced blast-related traumatic injuries. 135 (44%) patients had injuries to the head, face, or neck. 4 patients (1.3%) sustained BCVI. There was no statistically significant difference between the prevalence of BCVI in the deployed setting and the civilian sector. We speculate that in our study population, the relatively decreased prevalence of cervical spinal fractures (3.3%) observed may counter the theoretical increased risk of vascular injury from blast trauma, ultimately producing a similar prevalence of overall BCVI compared to civilian study populations. Based on our observations, we cannot advocate for or against more liberalized screening of BCVI in the deployed setting, and military physicians may elect to continue screening for these injuries with currently established and accepted practice guidelines developed in civilian trauma populations.
C1 [Timpone, Vincent] Massachusetts Gen Hosp, Dept Radiol, Div Neuroradiol, Boston, MA 02114 USA.
[Schneider, Brett E.] David Grant USAF Med Ctr, Dept Radiol, Div Neuroradiol, Travis Afb, CA 94535 USA.
[Sherman, Paul M.] Wilford Hall USAF Med Ctr, Dept Radiol, Div Neuroradiol, Lackland AFB, TX 78236 USA.
RP Timpone, V (reprint author), Massachusetts Gen Hosp, Dept Radiol, Div Neuroradiol, 55 Fruit St, Boston, MA 02114 USA.
NR 20
TC 1
Z9 1
U1 0
U2 1
PU ASSOC MILITARY SURG US
PI BETHESDA
PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 USA
SN 0026-4075
EI 1930-613X
J9 MIL MED
JI Milit. Med.
PD APR
PY 2013
VL 178
IS 4
BP 416
EP 420
DI 10.7205/MILMED-D-12-00108
PG 5
WC Medicine, General & Internal
SC General & Internal Medicine
GA AN7TY
UT WOS:000340805100013
PM 23707827
ER
PT J
AU O'Keefe, D
Morreale, BL
Lee, RH
Buncher, JB
Jenkins, JH
Fischbach, E
Gruenwald, T
Javorsek, D
Sturrock, PA
AF O'Keefe, D.
Morreale, B. L.
Lee, R. H.
Buncher, John B.
Jenkins, J. H.
Fischbach, Ephraim
Gruenwald, T.
Javorsek, D., II
Sturrock, P. A.
TI Spectral content of Na-22/Ti-44 decay data: implications for a solar
influence
SO ASTROPHYSICS AND SPACE SCIENCE
LA English
DT Article
DE Astroparticle physics; Neutrinos; Nuclear reactions; Sun: particle
emission
ID HALF-LIFE MEASUREMENTS; R-MODE OSCILLATIONS; SPACED DATA; RATES;
NEUTRINO; MODULATION; SPACECRAFT
AB We report a reanalysis of data on the measured decay rate ratio Na-22/Ti-44 which were originally published by Norman et al., and interpreted as supporting the conventional hypothesis that nuclear decay rates are constant and not affected by outside influences. We find upon a more detailed analysis of both the amplitude and the phase of the Norman data that they actually favor the presence of an annual variation in Na-22/Ti-44, albeit weakly. Moreover, this conclusion holds for a broad range of parameters describing the amplitude and phase of an annual sinusoidal variation in these data. The results from this and related analyses underscore the growing importance of phase considerations in understanding the possible influence of the Sun on nuclear decays. Our conclusions with respect to the phase of the Norman data are consistent with independent analyses of solar neutrino data obtained at Super-Kamiokande-I and the Sudbury Neutrino Observatory (SNO).
C1 [O'Keefe, D.; Morreale, B. L.; Lee, R. H.] USAF Acad, Dept Phys, Colorado Springs, CO 80840 USA.
[Buncher, John B.] Wittenberg Univ, Dept Phys, Springfield, OH 45501 USA.
[Jenkins, J. H.] Purdue Univ, Sch Nucl Engn, W Lafayette, IN 47907 USA.
[Jenkins, J. H.; Fischbach, Ephraim; Gruenwald, T.] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA.
[Sturrock, P. A.] Stanford Univ, Ctr Space Sci & Astrophys, Stanford, CA 94305 USA.
RP Jenkins, JH (reprint author), Purdue Univ, Sch Nucl Engn, 400 Cent Dr, W Lafayette, IN 47907 USA.
EM aastex-help@aas.org; jere@purdue.edu
OI Javorsek, Daniel/0000-0002-0329-4011
FU NSF [AST-06072572]; U.S. DOE [DE-AC02-76ER07128]
FX We are indebted to E.B. Norman and his collaborators for generously
sharing with us the data analyzed in this article. The work of P.A.S.
was supported in part by the NSF through Grant AST-06072572, and that of
E.F. was supported in part by U.S. DOE Contract No. DE-AC02-76ER07128.
The views expressed in this paper are those of the authors and do not
reflect the official policy or position of the U.S. Air Force, U.S.
Department of Defense, or the U.S. Government. The material in this
paper is Unclassified and approved for public release. Distribution is
unlimited, reference Air Force Flight Test Center Public Affairs.
NR 43
TC 6
Z9 6
U1 1
U2 20
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0004-640X
J9 ASTROPHYS SPACE SCI
JI Astrophys. Space Sci.
PD APR
PY 2013
VL 344
IS 2
BP 297
EP 303
DI 10.1007/s10509-012-1336-7
PG 7
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 098RP
UT WOS:000315566700004
ER
PT J
AU Martin, BE
Kabir, ME
Chen, W
AF Martin, B. E.
Kabir, Md. E.
Chen, W.
TI Undrained high-pressure and high strain-rate response of dry sand under
triaxial loading
SO INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
LA English
DT Article
DE Split-Hopkinson Pressure Bar; High pressure; High rate; Sand;
Confinement
ID PULSE SHAPING TECHNIQUES; SOFT SOILS; BEHAVIOR; BAR; TESTS
AB A Kolsky bar was modified to conduct triaxial compression experiments at high rates under the same stress state as in quasi-static conventional triaxial compression tests. Using this experimental technique the triaxial compression response of Quikrete (R)# 1961 sand at dry conditions was investigated at varying levels of confining pressure, strain rate, and initial density. The results show that the response of sand has negligible dependencies on strain rate and initial density, but is highly pressure dependent. The ability to impose a triaxial stress state allows the results to form a foundation for constitutive model development. Published by Elsevier Ltd.
C1 [Martin, B. E.] USAF, Res Lab, Eglin AFB, FL 32542 USA.
[Kabir, Md. E.; Chen, W.] Purdue Univ, Dept Aeronaut & Astronaut Engn, W Lafayette, IN 47907 USA.
RP Martin, BE (reprint author), USAF, Res Lab, Eglin AFB, FL 32542 USA.
EM bradley.martin@eglin.af.mil
NR 40
TC 10
Z9 10
U1 0
U2 15
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0734-743X
EI 1879-3509
J9 INT J IMPACT ENG
JI Int. J. Impact Eng.
PD APR
PY 2013
VL 54
BP 51
EP 63
DI 10.1016/j.ijimpeng.2012.10.008
PG 13
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA 099FM
UT WOS:000315606800005
ER
PT J
AU Kosai, H
Scofield, J
McNeal, S
Jordan, B
Ray, B
AF Kosai, Hiroyuki
Scofield, James
McNeal, Seana
Jordan, Brett
Ray, Biswajit
TI Design and Performance Evaluation of a 200 degrees C Interleaved Boost
Converter
SO IEEE TRANSACTIONS ON POWER ELECTRONICS
LA English
DT Article
DE Coupled inductor; dc/dc converter; high temperature; interleaved boost
converter (IBC); silicon carbide (SiC)
ID DC-DC CONVERTER; HIGH-STEP-UP
AB Recent advances in silicon carbide (SiC) power semiconductor technology and resulting availability of SiC Schottky rectifiers and controlled devices (bipolar junction transistors, JFETs, and MOSFETs) make it possible to design and implement power converters capable of operating at 200 degrees C. The design, prototype development, operation, and testing of a 74 kHz, 2 kW, 100 V/270V inversely coupled, interleaved, dc-dc boost converter over the 20-200 degrees C temperature range is presented in this paper. The advantages of coupled-inductor interleaved boost converters include increased efficiency, reduced size, reduced electromagnetic emission, faster transient response, and improved reliability. Optimization of a high temperature X-perm core-based coupled inductor architecture, in terms of ac flux balancing and dc flux cancellation is discussed. DC characterization of SiC power devices used in the design (Schottky rectifier and JFET) over the 20-200 degrees C temperature range is presented as well. The power stage of the converter, including the power semiconductor devices, coupled inductor, and X7R ceramic input and output filter capacitors, was placed inside a temperature controlled chamber for testing. JFET gate drive circuit, input power source, and output load were external to the environmental chamber. Converter testing and performance evaluation was accomplished over a 20-200 degrees C ambient temperature range. As expected, JFET conduction loss increased and converter efficiency decreased with increasing temperatures. The drop in converter efficiency was in the range of 2%-4% over the entire load (200W to 2 kW) and temperature (20-200 degrees C) ranges evaluated. At 200 degrees C, output voltage ripple increased by similar to 60% due to the rapid decline in X7R capacitance at the high-temperature extreme. The results obtained during this study suggest that the realization of 200 degrees C power converters is feasible through a judicious selection of power semiconductor devices, magnetic core materials, and capacitor dielectrics. As a result, high temperature, frequency, and power density converters are expected to be a reality in the near future.
C1 [Kosai, Hiroyuki] Universal Energy Syst Inc, Dayton, OH 45432 USA.
[Scofield, James; McNeal, Seana; Jordan, Brett] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Ray, Biswajit] Bloomsburg Univ Penn, Dept Elect Engn Technol, Bloomsburg, PA 17815 USA.
RP Kosai, H (reprint author), Universal Energy Syst Inc, Dayton, OH 45432 USA.
EM hiroyuki.kosai@wpafb.af.mil; james.scofield@wpafb.af.mil;
seana.mcneal@wpafb.af.mil; brett.jordan@wpafb.af.mil; bray@bloomu.edu
NR 25
TC 18
Z9 19
U1 0
U2 18
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0885-8993
J9 IEEE T POWER ELECTR
JI IEEE Trans. Power Electron.
PD APR
PY 2013
VL 28
IS 4
SI SI
BP 1691
EP 1699
DI 10.1109/TPEL.2012.2208124
PG 9
WC Engineering, Electrical & Electronic
SC Engineering
GA 086PO
UT WOS:000314698300018
ER
PT J
AU Starkweather, AR
Lyon, DE
Schubert, CM
AF Starkweather, Angela R.
Lyon, Debra E.
Schubert, Christine M.
TI Pain and Inflammation in Women With Early-Stage Breast Cancer Prior to
Induction of Chemotherapy
SO BIOLOGICAL RESEARCH FOR NURSING
LA English
DT Article
DE breast cancer; cancer pain; pain; pain interference; inflammation;
C-reactive protein; cytokines; symptoms
ID QUALITY-OF-LIFE; SYMPTOM CLUSTERS; CYTOKINE; FATIGUE; SURVIVORS;
BIOMARKERS; EXPRESSION; DIAGNOSIS; ARTHRITIS; SURGERY
AB Context: Pain is a commonly experienced and distressing symptom in women with breast cancer (BCA), and recent evidence suggests that immune activation may be associated with pain and other co-occurring symptoms. However, no studies to date have explored the relationships among perceived pain and biomarkers of inflammation in women with early-stage BCA during the initial course of treatment. Objectives: The purpose of this research study was to examine the relationships among pro-and anti-inflammatory biomarkers and the presence of pain and other symptoms (anxiety, depression, fatigue, and sleep disorder) prior to induction of chemotherapy. Method: This was a secondary analysis of data that measured perceived symptoms, including the presence of pain and pain interference, and plasma levels of pro-and anti-inflammatory cytokines and C-reactive protein (CRP) in women with early-stage BCA (N = 32) at 1 month postsurgery but prior to induction of chemotherapy. Results: Women experiencing pain had significantly higher levels of CRP (p < .01), interleukin (IL) 13 (p < .02), and IL-7 (p < .02) and more pain interference (p < .01), depression (p < .01), and sleep disturbance (p < .01) compared to women reporting no pain. Conclusion: The presence of pain during the initial course of treatment in women with early-stage BCA was associated with significantly higher levels of CRP, IL-7, and IL-13, suggesting a potential role of immune activation in perceived pain. Further research to examine the precise effects of these biological factors in modulating pain is needed. Perceived pain was also associated with multiple co-occurring symptoms, and this finding has important implications for symptom management.
C1 [Starkweather, Angela R.] Virginia Commonwealth Univ, Sch Nursing, Dept Adult Hlth & Nursing Syst, Richmond, VA 23298 USA.
[Lyon, Debra E.] Virginia Commonwealth Univ, Sch Nursing, Dept Family & Community Hlth Nursing, Richmond, VA 23298 USA.
[Schubert, Christine M.] USAF, Inst Technol, Dept Math & Stat, Wright Patterson AFB, OH 45433 USA.
RP Starkweather, AR (reprint author), Virginia Commonwealth Univ, Sch Nursing, Dept Adult Hlth & Nursing Syst, 1100 E Leigh St,POB 980567, Richmond, VA 23298 USA.
EM astarkweathe@vcu.edu
FU National Cancer Institute [R21 CA]
FX The authors disclosed receipt of the following financial support for the
research, authorship, and/or publication of this article: Components of
the research were supported by the National Cancer Institute through
grant #R21 CA (D. Lyon, PI).
NR 39
TC 7
Z9 8
U1 2
U2 26
PU SAGE PUBLICATIONS INC
PI THOUSAND OAKS
PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA
SN 1099-8004
J9 BIOL RES NURS
JI Biol. Res. Nurs.
PD APR
PY 2013
VL 15
IS 2
BP 234
EP 241
DI 10.1177/1099800411425857
PG 8
WC Nursing
SC Nursing
GA 082BU
UT WOS:000314367500014
PM 22084403
ER
PT J
AU Ortiz, A
Kingston, D
Langbort, C
AF Ortiz, Andres
Kingston, Derek
Langbort, Cedric
TI Multi-UAV Velocity and Trajectory Scheduling Strategies for Target
Classification by a Single Human Operator
SO JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS
LA English
DT Article
DE Unmanned aircraft; Optimization; Trajectory planning; Task scheduling;
Linear programming; Human-machine interfaces
ID VEHICLES
AB This work addresses the problem of enabling a single human operator to individually inspect targets for a fixed amount of time in a reconnaissance mission. The task of the operator is to classify the targets as friends or foes in real time, as they appear in video feeds from multiple UAVs. In order to account for cognitive limitations, the human is modeled as a single processing unit that can only execute one task at a time. A task is defined as a target inside the field of view of a given UAV, that needs to be inspected. Under the assumptions of this model, a linear program (LP) formulation is used to optimally find each task's arrival time and latency in the system such that the human operator can inspect each target individually for some time Delta t. Previous work by the authors investigated the idea of using UAV velocity modifications to meet the timing schedule specified by the LP solution. In this paper, the idea of UAV trajectory changes is introduced by modeling the UAVs as Dubins vehicles. Modifications to the bounds on the LP constraints are derived based on Dubins trajectories. The new bounds ensure that the LP solution returns a timing schedule achievable via maneuvers that combine velocity and trajectory changes to the UAVs' flight plans. An on-line algorithm is developed that constructs and commands these velocity and trajectory changes in real time when conflicts arise. Correctness properties of this algorithm are analyzed and discussed for mission scenarios where the location of the targets is unknown and targets are discovered by the UAVs in real time.
C1 [Ortiz, Andres; Langbort, Cedric] Univ Illinois, Dept Aerosp Engn, Urbana, IL 61801 USA.
[Kingston, Derek] USAF, Res Lab, Dayton, OH USA.
RP Ortiz, A (reprint author), Univ Illinois, Dept Aerosp Engn, Urbana, IL 61801 USA.
EM aortizr2@illinois.edu; Derek.Kingston@wpafb.af.mil;
langbort@illinois.edu
NR 17
TC 2
Z9 2
U1 1
U2 37
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0921-0296
EI 1573-0409
J9 J INTELL ROBOT SYST
JI J. Intell. Robot. Syst.
PD APR
PY 2013
VL 70
IS 1-4
SI SI
BP 255
EP 274
DI 10.1007/s10846-012-9701-x
PG 20
WC Computer Science, Artificial Intelligence; Robotics
SC Computer Science; Robotics
GA 058OE
UT WOS:000312642600018
ER
PT J
AU Roslyak, O
Gumbs, G
Huang, DH
AF Roslyak, O.
Gumbs, Godfrey
Huang, Danhong
TI Gap-modulated doping effects on indirect exchange interaction between
magnetic impurities in graphene
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
AB A dilute distribution of magnetic impurities is assumed to be present in doped graphene. We calculate the interaction energy between two magnetic impurities which are coupled via the indirect-exchange or Ruderman-Kittel-Kasuva-Yosida (RKKY) interaction by the doped conduction electrons. The current model is a half-filled AB-lattice structure. Our calculations are based on the retarded lattice Green's function formalism in momentum-energy space which is employed in linear response theory to determine the magnetic susceptibility in coordinate space. Analytic results are obtained for gapped graphene when the magnetic impurities are placed on the A and B sublattice sites of the structure. This interaction, which is important in determining spin ordering, has been found to be significantly different for AA and BB exchange energies in doped graphene due to the existence of an energy gap and is attributed to a consequence of the local fields not being equal on the A and B sublattices. For doped graphene, the oscillations of all three RKKY interactions from ferromagnetic to antiferromagnetic with increasing Fermi energy is significantly modified by the energy gap both in magnitude and phase. Additionally, the AB exchange energy may be modified by the presence of a gap for undoped graphene but not for doped graphene due to the dominance of doped conduction electrons. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4795624]
C1 [Roslyak, O.; Gumbs, Godfrey] CUNY Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA.
[Huang, Danhong] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Roslyak, O (reprint author), CUNY Hunter Coll, Dept Phys & Astron, 695 Pk Ave, New York, NY 10065 USA.
FU AFRL [FA9453-11-01-0263]; Air Force Office of Scientific Research
(AFOSR)
FX This research was supported by the Contract No. FA9453-11-01-0263 of
AFRL. D.H. would like to thank the Air Force Office of Scientific
Research (AFOSR) for its support.
NR 22
TC 3
Z9 3
U1 1
U2 16
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD MAR 28
PY 2013
VL 113
IS 12
AR 123702
DI 10.1063/1.4795624
PG 7
WC Physics, Applied
SC Physics
GA 117QI
UT WOS:000316967800024
ER
PT J
AU MacIntosh, VH
Tastad, KJ
Eick-Cost, AA
AF MacIntosh, Victor H.
Tastad, Katie J.
Eick-Cost, Angelia A.
TI Mid-season influenza vaccine effectiveness 2011-2012: A Department of
Defense Global, Laboratory-based, Influenza Surveillance System
case-control study estimate
SO VACCINE
LA English
DT Article
DE Vaccine effectiveness; Influenza; United States; Military
ID MILITARY BASIC TRAINEES
AB Mid-season influenza vaccine effectiveness (VE) was estimated using data from surveillance conducted by the Department of Defense Global, Laboratory-based, Influenza Surveillance Program at the United States Air Force School of Aerospace Medicine. Respiratory specimens from geographically diverse military members and dependents who sought medical care 2 October 2011-3 March 2012 were analyzed by viral culture and real-time reverse transcriptase-polymerase chain reaction; influenza viruses were typed and sequenced. Controls were influenza test-negative. Overall, vaccine type and subtype-specific VE were estimated using logistic regression. Adjusted VE (95% confidence interval) was: overall 77 (57-87)%; live attenuated vaccine (LAIV) 74 (48-87)%; trivalent inactivated vaccine (TIV) 75 (48-88)%. H3 component-specific VE was: overall 77 (52-89)%; LAIV 78 (47-91)%; TIV 74 (38-89)%; data were insufficient for separate H1 and B estimates. Both vaccine types showed moderate to high VE, indicating significant protection against circulating influenza strains. Published by Elsevier Ltd.
C1 [MacIntosh, Victor H.; Tastad, Katie J.] USAF, Sch Aerosp Med, Wright Patterson AFB, OH 45433 USA.
[Tastad, Katie J.; Eick-Cost, Angelia A.] Henry M Jackson Fdn Advancement Mil Med Inc, Bethesda, MD 20817 USA.
[Eick-Cost, Angelia A.] Armed Forces Hlth Surveillance Ctr, Silver Spring, MD 20910 USA.
RP MacIntosh, VH (reprint author), USAF, Epidemiol Consult Serv, Sch Aerosp Med, 2510 5th St, Wright Patterson AFB, OH 45433 USA.
EM Victor.MacIntosh@us.af.mil; Katie.Tastad@wpafb.af.mil
FU U.S. Air Force; Armed Forces Health Surveillance Center, Silver Spring,
Maryland
FX This work was supported by the U.S. Air Force and the Armed Forces
Health Surveillance Center, Silver Spring, Maryland. These sponsors had
no role in study design, collection, analysis or interpretation of data,
in writing the report or in the decision to submit the paper for
publication.
NR 15
TC 2
Z9 2
U1 0
U2 2
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0264-410X
J9 VACCINE
JI Vaccine
PD MAR 25
PY 2013
VL 31
IS 13
BP 1651
EP 1655
DI 10.1016/j.vaccine.2013.01.022
PG 5
WC Immunology; Medicine, Research & Experimental
SC Immunology; Research & Experimental Medicine
GA 120JQ
UT WOS:000317167000001
PM 23395733
ER
PT J
AU Hyde, MW
Basu, S
Spencer, MF
Cusumano, SJ
Fiorino, ST
AF Hyde, Milo W.
Basu, Santasri
Spencer, Mark F.
Cusumano, Salvatore J.
Fiorino, Steven T.
TI Physical optics solution for the scattering of a partially-coherent wave
from a statistically rough material surface
SO OPTICS EXPRESS
LA English
DT Article
ID STOCHASTIC ELECTROMAGNETIC BEAMS; SPATIALLY RANDOM-MEDIA; SPECKLE
PATTERNS; ATMOSPHERIC-TURBULENCE; LIGHT; POLARIZATION; ILLUMINATION;
SIMULATION; INTENSITY; FIELDS
AB The scattering of a partially-coherent wave from a statistically rough material surface is investigated via derivation of the scattered field cross-spectral density function. Two forms of the cross-spectral density are derived using the physical optics approximation. The first is applicable to smooth-to-moderately rough surfaces and is a complicated expression of source and surface parameters. Physical insight is gleaned from its analytical form and presented in this work. The second form of the cross-spectral density function is applicable to very rough surfaces and is remarkably physical. Its form is discussed at length and closed-form expressions are derived for the angular spectral degree of coherence and spectral density radii. Furthermore, it is found that, under certain circumstances, the cross-spectral density function maintains a Gaussian Schell-model form. This is consistent with published results applicable only in the paraxial regime. Lastly, the closed-form cross-spectral density functions derived here are rigorously validated with scatterometer measurements and full-wave electromagnetic and physical optics simulations. Good agreement is noted between the analytical predictions and the measured and simulated results. (C) 2013 Optical Society of America
C1 [Hyde, Milo W.; Basu, Santasri; Spencer, Mark F.; Fiorino, Steven T.] USAF, Inst Technol, Dayton, OH 45433 USA.
[Cusumano, Salvatore J.] MZA Associates Corp, Dayton, OH 45430 USA.
RP Hyde, MW (reprint author), USAF, Inst Technol, 2950 Hobson Way, Dayton, OH 45433 USA.
EM milo.hyde@afit.edu
FU Air Force Institute of Technology; U.S. Department of Energy
FX This research was supported in part by an appointment to the
Postgraduate Research Participation Program at the Air Force Institute
of Technology administered by the Oak Ridge Institute for Science and
Education through an interagency agreement between the U.S. Department
of Energy and AFIT.
NR 66
TC 8
Z9 8
U1 1
U2 17
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD MAR 25
PY 2013
VL 21
IS 6
BP 6807
EP 6825
DI 10.1364/OE.21.006807
PG 19
WC Optics
SC Optics
GA 115ES
UT WOS:000316796000018
PM 23546063
ER
PT J
AU Cornella, BM
Gimelshein, SF
Lilly, TC
Ketsdever, AD
AF Cornella, Barry M.
Gimelshein, Sergey F.
Lilly, Taylor C.
Ketsdever, Andrew D.
TI Narrowband coherent Rayleigh-Brillouin scattering from gases confined by
a high-intensity optical lattice
SO PHYSICAL REVIEW A
LA English
DT Article
ID VIBRATIONAL RELAXATION
AB Molecular nitrogen at 0.8 atm and 300 and 500 K and methane at 0.8 atm and 300 K were subjected to optical lattices formed by narrow-band 532-nm laser pulses with intensities on the optical axis near, but below, the gas ionization limit. A third pulse was introduced to experimentally probe the response, as a function of the lattice velocity, of the gas to the deep monochromatic potential wells formed by the lasers. Coherent Rayleigh-Brillouin scattering (CRBS) line shapes were recorded and compared to numerically predicted magnitudes of the density perturbations induced in the gas. Both experimental results and those from direct simulation Monte Carlo simulations show a deviation from previously published low-intensity CRBS line-shape models. The deviation indicates a trend, as a function of lattice velocity, similar to that relating to previously published energy and momentum transfer calculations for high-intensity lattices. Furthermore, the deviation indicates a maximum intensity at which current CRBS theory is valid. DOI: 10.1103/PhysRevA.87.033825
C1 [Cornella, Barry M.; Gimelshein, Sergey F.] ERC Inc, Edwards AFB, CA 93524 USA.
[Lilly, Taylor C.] Univ Colorado, Dept Mech & Aerosp Engn, Colorado Springs, CO 80918 USA.
[Ketsdever, Andrew D.] USAF, Res Lab, Edwards AFB, CA 93524 USA.
RP Cornella, BM (reprint author), ERC Inc, Edwards AFB, CA 93524 USA.
FU Air Force Office of Scientific Research (AFOSR); DOD High Performance
Computing Modernization Program at the US Army Engineer Research and
Development Center DOD Supercomputing Resource Center; National Science
Foundation [OCI-1053575]
FX The authors wish to recognize and thank Dr. Mikhail Shneider for his
patient and beneficial discussions. This work was supported by the Air
Force Office of Scientific Research (AFOSR). The authors would like to
thank Dr. Mitat Birkan (AFOSR RSA) for his support of numerical efforts
and Dr. Tatjana Curcic (AFOSR RSE) for her support of experimental
efforts. This work was also supported in part by a grant of computer
time from the DOD High Performance Computing Modernization Program at
the US Army Engineer Research and Development Center DOD Supercomputing
Resource Center. This work used in part the Extreme Science and
Engineering Discovery Environment, which is supported by National
Science Foundation Grant No. OCI-1053575.
NR 28
TC 11
Z9 11
U1 0
U2 5
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1050-2947
J9 PHYS REV A
JI Phys. Rev. A
PD MAR 22
PY 2013
VL 87
IS 3
AR 033825
DI 10.1103/PhysRevA.87.033825
PG 6
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 113IH
UT WOS:000316659400008
ER
PT J
AU Perez, JPL
McMahon, BW
Schneider, S
Boatz, JA
Hawkins, TW
McCrary, PD
Beasley, PA
Kelley, SP
Rogers, RD
Anderson, SL
AF Perez, Jesus Paulo L.
McMahon, Brandon W.
Schneider, Stefan
Boatz, Jerry A.
Hawkins, Tom W.
McCrary, Parker D.
Beasley, Preston A.
Kelley, Steven P.
Rogers, Robin D.
Anderson, Scott L.
TI Exploring the Structure of Nitrogen-Rich Ionic Liquids and Their Binding
to the Surface of Oxide-Free Boron Nanoparticles
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID ELECTRONIC POPULATION ANALYSIS; MOLECULAR WAVE FUNCTIONS; ENERGETIC
SALTS; X-RAY; HYPERGOLIC FUELS; BASIS-SET; IN-VACUO; ENERGIES;
SPECTROSCOPY; ANION
AB The structure of two different energetic ionic liquids and the nature of their binding to elemental boron surfaces were investigated by a combination of X-ray photoelectron spectroscopy, IR spectroscopy, zeta potential measurements, thermogravimetric analysis, and first-principles theory. It was found that both 1-methyl-4-amino-1,2,4-triazolium dicyanamide ([MAT][DCA]) and 1-butyl-3-methylimidazolium dicyanamide ([BMIM][DCA]) ionic liquids bind to boron well enough to resist removal by ultrasonic washing and to protect the boron surface from oxidation during air exposure of the washed powder. The data suggest that both the cation and the anion of the ionic liquids interact with the boron surface; however, for [MAT][DCA], the interaction of the cation appears to dominate, while for [BMIM][DCA] the interaction with the [DCA](-) anion dominates. The difference is attributed to the binding of boron to the amino group of [MAT](+), and the amino group also appears to help bind a thicker ionic liquid (IL) capping layer.
C1 [Perez, Jesus Paulo L.; McMahon, Brandon W.; Anderson, Scott L.] Univ Utah, Dept Chem, Salt Lake City, UT 84112 USA.
[Schneider, Stefan; Boatz, Jerry A.; Hawkins, Tom W.] USAF, Propellants Branch, Rocket Prop Div, Aerosp Syst Directorate,Res Lab,AFMC AFRL RQRP, Edwards AFB, CA 93524 USA.
[McCrary, Parker D.; Beasley, Preston A.; Kelley, Steven P.; Rogers, Robin D.] Univ Alabama, Ctr Green Mfg, Tuscaloosa, AL 35487 USA.
[McCrary, Parker D.; Beasley, Preston A.; Kelley, Steven P.; Rogers, Robin D.] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA.
RP Anderson, SL (reprint author), Univ Utah, Dept Chem, 315 South 1400 East, Salt Lake City, UT 84112 USA.
EM anderson@chem.utah.edu
OI McCrary, Parker/0000-0002-4882-0177; Rogers, Robin
D./0000-0001-9843-7494
FU Air Force Office of Scientific Research under AFOSR MURI Grant
[FA9550-08-1-0400]; University of Utah Research Foundation [51003387];
W.M. Keck Foundation; M.J. Murdock Charitable Trust; Oregon Nanoscience
and Microtechnologies Institute; Air Force Office of Scientific Research
(AFOSR) [FA9550-10-1-0521]; United States Department of Defense (DoD)
through the National Defense, Science & Engineering Graduate Fellowship
(NDSEG) Program
FX The authors acknowledge support from the Air Force Office of Scientific
Research under AFOSR MURI Grant FA9550-08-1-0400 and from the University
of Utah Research Foundation (grant 51003387). We would also like to
acknowledge the CAMCOR TEM facility which is supported by grants from
the W.M. Keck Foundation, the M.J. Murdock Charitable Trust, and the
Oregon Nanoscience and Microtechnologies Institute. The AFRL group would
like to acknowledge the Department of Defense High Performance Computing
Modernization Program at the Air Force Research Laboratory, Engineering
Research and Development Center, and Navy DoD Supercomputing Resource
Centers for the computer time granted for the theoretical work. The
University of Alabama group would like to thank the Air Force Office of
Scientific Research (AFOSR Grant # FA9550-10-1-0521), and P.D.M. thanks
the United States Department of Defense (DoD) through the National
Defense, Science & Engineering Graduate Fellowship (NDSEG) Program.
NR 90
TC 16
Z9 16
U1 3
U2 67
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD MAR 21
PY 2013
VL 117
IS 11
BP 5693
EP 5707
DI 10.1021/jp3100409
PG 15
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 114WF
UT WOS:000316773000021
ER
PT J
AU Hewitt, JD
Houlahan, TJ
Gallagher, JE
Carroll, DL
Palla, AD
Verdeyen, JT
Perram, GP
Eden, JG
AF Hewitt, J. D.
Houlahan, T. J., Jr.
Gallagher, J. E.
Carroll, D. L.
Palla, A. D.
Verdeyen, J. T.
Perram, G. P.
Eden, J. G.
TI Role of excited state photoionization in the 852.1 nm Cs laser pumped by
Cs-Ar photoassociation
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID ALKALI LASERS; IONIZATION
AB Photoionization of Cs (6p P-2(3/2)) atoms during the operation of a Cs D-2 line (852.1 nm: 6p P-2(3/2) -> 6s S-2(1/2)) laser, pumped by free -> free transitions of thermal Cs-Ar ground state pairs, has been investigated experimentally and computationally. Photoexcitation of Cs vapor/Ar mixtures through the blue satellite of the D-2 transition (peaking at 836.7 nm) selectively populates the P-2(3/2) upper laser level by the dissociation of the CsAr excited complex. Comparison of laser output energy data, for instantaneous pump powers up to 3MW, with the predictions of a numerical model sets an upper bound of 8 x 10(-26) cm(4) W-1 on the Cs (6p P-2(3/2)) two photon ionization cross-section at 836.7 nm which corresponds to a single photon cross-section of 2.4 x 10(-19) cm(2) for a peak pump intensity of 3MW cm(-2). (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4796040]
C1 [Hewitt, J. D.; Houlahan, T. J., Jr.; Eden, J. G.] Univ Illinois, Dept Elect & Comp Engn, Lab Opt Phys & Engn, Urbana, IL 61801 USA.
[Gallagher, J. E.; Perram, G. P.] USAF, Dept Engn Phys, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Carroll, D. L.; Palla, A. D.; Verdeyen, J. T.] CU Aerosp, Champaign, IL 61802 USA.
RP Hewitt, JD (reprint author), Univ Illinois, Dept Elect & Comp Engn, Lab Opt Phys & Engn, 1406 W Green St, Urbana, IL 61801 USA.
FU U.S. Air Force Office of Scientific Research (AFOSR) [FA9550-10-1-0048];
High Energy Laser Joint Technology Office (HEL-JTO) [FA9550-07-1-0575]
FX The support of this work by the U.S. Air Force Office of Scientific
Research (AFOSR) and the High Energy Laser Joint Technology Office
(HEL-JTO) under Grant Nos. FA9550-10-1-0048 and FA9550-07-1-0575,
respectively, is gratefully acknowledged.
NR 12
TC 4
Z9 4
U1 0
U2 15
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 18
PY 2013
VL 102
IS 11
AR 111104
DI 10.1063/1.4796040
PG 4
WC Physics, Applied
SC Physics
GA 111TX
UT WOS:000316544900004
ER
PT J
AU Li, YS
Vecchio, NE
Lu, WJ
AF Li, Ying-Sing
Vecchio, Nicolas E.
Lu, Weijie
TI Infrared and Raman spectra of (3,3,3-trifluoropropyl)trimethoxysilane,
its sol and xerogel
SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
LA English
DT Article
DE Raman spectra; Infrared spectra; (3,3,3-Trifluopropyl)trimethoxysilane;
Organomodifled silica sol; Xerogel
ID AB-INITIO CALCULATIONS; VIBRATIONAL ASSIGNMENT; CORROSION PROTECTION;
GEL; COPPER; CONFORMATIONS; ALUMINUM; FILMS
AB Organic modified silica sot was prepared by using (3,3,3-trifluoropropyl)trimethoxysilane (TFPTMS) as a precursor in ethanol solution under acidic condition. Infrared and Raman spectra were recorded for the silane coupling agent (SCA), TFPTMS sot and xerogel. Vibrational assignments have been suggested based on the spectral relative intensity, results from the vibrational study of trimethoxypropylsilane (TMPS), similar trifluorocompounds and group frequencies. Low temperature IR spectra revealed the presence of two conformers in TFPTMS. Only one conformer could be identified in the TFPTMS sot and xerogel. Thermal investigation of TFPTMS xerogel with infrared spectroscopic method indicated that the organic part remained essentially unchanged at or below 350 degrees C but decomposed at or around 450 degrees C, in agreement with the result from thermal gravimetric analysis (TGA). After the decomposition of the organic branch, the remaining part of the xerogel was composed of silica. (C) 2012 Elsevier B.V. All rights reserved.
C1 [Li, Ying-Sing; Vecchio, Nicolas E.] Univ Memphis, Dept Chem, Memphis, TN 38152 USA.
[Lu, Weijie] USAF, Res Lab, AFRL RXAN, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Li, YS (reprint author), Univ Memphis, Dept Chem, Memphis, TN 38152 USA.
EM yingli@memphis.edu
FU University of Memphis; US Air Force Research Office
FX This research is partially supported by the University of Memphis and by
the US Air Force Research Office.
NR 23
TC 2
Z9 2
U1 1
U2 15
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1386-1425
J9 SPECTROCHIM ACTA A
JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr.
PD MAR 15
PY 2013
VL 105
BP 213
EP 217
DI 10.1016/j.saa.2012.12.022
PG 5
WC Spectroscopy
SC Spectroscopy
GA 125NB
UT WOS:000317545400030
PM 23314214
ER
PT J
AU Hossan, MR
Dillon, R
Roy, AK
Dutta, P
AF Hossan, Mohammad Robiul
Dillon, Robert
Roy, Ajit K.
Dutta, Prashanta
TI Modeling and simulation of dielectrophoretic particle-particle
interactions and assembly
SO JOURNAL OF COLLOID AND INTERFACE SCIENCE
LA English
DT Article
DE Multiple particle interactions; Immersed boundary method; Immersed
interface method; Dielectrophoresis; Particle assembly
ID ELECTRIC-FIELDS; COLLOIDAL PARTICLES; CELLS; CHIP; DYNAMICS; MOTION;
HEART; FLOW; LIVE
AB Electric field induced particle-particle interactions and assembly are of great interest due to their useful applications in micro devices. The behavior of particles becomes more complex if multiple particles interact with each other at the same time. In this paper, we present a numerical study of two dimensional DC dielectrophoresis based particle-particle interactions and assembly for multiple particles using a hybrid immersed interface-immersed boundary method. The immersed interface method is employed to capture the physics of electrostatics in a fluid media with suspended particles. Particle interaction based dielectrophoretic forces are obtained using Maxwell's stress tensor without any boundary or volume integration. This electrostatic force distribution mimics the actual physics of the immersed particles in a fluid media. The corresponding particle response and hydrodynamic interactions are captured through the immersed boundary method by solving the transient Navier-Stokes equations. The interaction and assembly of multiple electrically similar and dissimilar particles are studied for various initial positions and orientations. Numerical results show that in a fluid media, similar particles form a chain parallel to the applied electric field, whereas dissimilar particles form a chain perpendicular to the applied electric field. Irrespective of initial position and orientation, particles first align themselves parallel or perpendicular to the electric field depending on the similarity or dissimilarity of particles. The acceleration and deceleration of particles are also observed and analyzed at different phases of the assembly process. This comprehensive study can be used to explain the multiple particle interaction and assembly phenomena observed in experiments. (C) 2012 Elsevier Inc. All rights reserved.
C1 [Hossan, Mohammad Robiul; Dutta, Prashanta] Washington State Univ, Pullman, WA 99164 USA.
[Dillon, Robert] Washington State Univ, Dept Math, Pullman, WA 99164 USA.
[Roy, Ajit K.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Dutta, P (reprint author), Washington State Univ, Pullman, WA 99164 USA.
EM prashanta@wsu.edu
RI Dutta, Prashanta/A-1437-2011
FU Air Force Office of Scientific Research; National Science Foundation
[CTS 1250107]
FX This work was partly supported by the Air Force Office of Scientific
Research and partly by the National Science Foundation under Grant No.
CTS 1250107.
NR 36
TC 30
Z9 30
U1 1
U2 53
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0021-9797
J9 J COLLOID INTERF SCI
JI J. Colloid Interface Sci.
PD MAR 15
PY 2013
VL 394
BP 619
EP 629
DI 10.1016/j.jcis.2012.12.039
PG 11
WC Chemistry, Physical
SC Chemistry
GA 095HN
UT WOS:000315325400079
PM 23348000
ER
PT J
AU Paduano, QS
Weyburne, DW
Tomich, DH
AF Paduano, Qing S.
Weyburne, David W.
Tomich, David H.
TI Growth and properties of m-plane GaN on m-plane sapphire by
metal-organic chemical vapor deposition
SO JOURNAL OF CRYSTAL GROWTH
LA English
DT Article
DE Defects; X-ray diffraction; Metalorganic chemical vapor deposition;
Nitrides
ID LIGHT-EMITTING-DIODES; STACKING-FAULTS; QUANTUM-WELLS; EPITAXY; FILMS
AB A characterization study of heteroepitaxial grown m-plane GaN on m-plane sapphire substrates by MOCVD was undertaken. Using X-ray diffraction and photoluminescence, the growth characteristics and epi-layer properties of m-GaN layers were investigated with special emphasis on the role of AIN buffer layers in preventing unintentional nitridation prior to GaN deposition. Substrate nitridation was found to lead to undesirable crystallographic orientations. In-plane lattice parameters of m-GaN obtained from X-ray reciprocal space mapping indicate anisotropic residual strain is present in these layers even under optimized growth conditions. Compressive and tensile strains were observed along either [0001] or [11 (2) over bar0] directions, depending on AIN buffer layer conditions and the presence of extended structural defects. In addition, extended structural defects commonly observed in GaN showed a significant effect on stacking fault related luminescence in m-GaN. Published by Elsevier B.V.
C1 [Paduano, Qing S.; Weyburne, David W.; Tomich, David H.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Paduano, QS (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM cpaduano@gmail.com
FU Air Force Office of Scientific Research
FX This work was funded by the Air Force Office of Scientific Research. The
authors would like to thank Wally Rice of Wyle Laboratories for help
with the luminescence measurements.
NR 23
TC 8
Z9 8
U1 6
U2 62
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0022-0248
J9 J CRYST GROWTH
JI J. Cryst. Growth
PD MAR 15
PY 2013
VL 367
BP 104
EP 109
DI 10.1016/j.jcrysgro.2012.12.028
PG 6
WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied
SC Crystallography; Materials Science; Physics
GA 093OF
UT WOS:000315200500017
ER
PT J
AU Avrutsky, I
Gibson, R
Sears, J
Khitrova, G
Gibbs, HM
Hendrickson, J
AF Avrutsky, I.
Gibson, R.
Sears, J.
Khitrova, G.
Gibbs, H. M.
Hendrickson, J.
TI Linear systems approach to describing and classifying Fano resonances
SO PHYSICAL REVIEW B
LA English
DT Article
ID WAVE-GUIDE; METAMATERIALS; GRATINGS
AB We show that a generalized asymmetric resonant line shape derived elsewhere from rigorous electromagnetic calculations [Gallinet and Martin, Phys.Rev.B 83, 235427 (2011)] and from the two-oscillators model [Joe et al., Phys.Scr. 74. 259 (2006)] can also be obtained using a very general assumption that the spectral dependence of the scattering amplitudes is given by the transfer function of a linear system. We reformulate the line shape equation and show that in the case of a first-order transfer function all possible line shapes can be presented by a weighted sum of the original Fano and Lorentzian line shapes. We propose a new two-parameter classification scheme for asymmetric resonances with one parameter delta being the asymmetry factor of the Fano component and the other parameter eta quantifying the relative weight of the Fano and Lorentzian components of the line shape. The proposed formula is used to fit experimental spectra of a silicon photonic crystal cavity nanobeam interrogated using a fiber taper probe.
C1 [Avrutsky, I.; Gibson, R.; Hendrickson, J.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Avrutsky, I.] Wayne State Univ, Dept Elect & Comp Engn, Detroit, MI 48202 USA.
[Gibson, R.; Sears, J.; Khitrova, G.; Gibbs, H. M.] Univ Arizona, Ctr Opt Sci, Tucson, AZ 85721 USA.
RP Avrutsky, I (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
FU Air Force Office of Scientific Research; CPHOM; NSF Center for Photonics
and Multiscale Nanomaterials, Material Research Science and Engineering
Center Program DMR [1120923]; Air Force Office of Scientific Research
[12RY05COR, FA9550-10-1-0003]
FX I.A. acknowledges support by the Air Force Office of Scientific Research
under the Summer Faculty Fellowship Program and by CPHOM, NSF Center for
Photonics and Multiscale Nanomaterials, Material Research Science and
Engineering Center Program DMR 1120923. J.H. would like to acknowledge
support from the Air Force Office of Scientific Research (Program
Manager Dr. Gernot Pomrenke) under Contract No. 12RY05COR. The Tucson
group acknowledges support from Air Force Office of Scientific Research
through Grant No. FA9550-10-1-0003 (Program Manager Dr. Gernot
Pomrenke).
NR 31
TC 8
Z9 8
U1 0
U2 37
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD MAR 13
PY 2013
VL 87
IS 12
AR 125118
DI 10.1103/PhysRevB.87.125118
PG 6
WC Physics, Condensed Matter
SC Physics
GA 105WW
UT WOS:000316104400004
ER
PT J
AU Liu, M
Zhou, ZY
Nan, TX
Howe, BM
Brown, GJ
Sun, NX
AF Liu, Ming
Zhou, Ziyao
Nan, Tianxiang
Howe, Brandon M.
Brown, Gail J.
Sun, Nian X.
TI Voltage Tuning of Ferromagnetic Resonance with Bistable Magnetization
Switching in Energy-Efficient Magnetoelectric Composites
SO ADVANCED MATERIALS
LA English
DT Article
DE microwave; magnetoelectric couplings; multiferroic heterostructures;
magnetoelectric composites
ID SINGLE-CRYSTALS; HETEROSTRUCTURES; MULTIFERROICS; DEVICES; FUTURE;
MEMORY; BIAS
C1 [Liu, Ming; Howe, Brandon M.; Brown, Gail J.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Zhou, Ziyao; Nan, Tianxiang; Sun, Nian X.] Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA.
RP Liu, M (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM ming.liu.ctr@wpafb.af.mil; nian@ece.neu.edu
RI Liu, Ming/B-4143-2009; Zhou, Ziyao/N-8398-2015; Nan,
Tianxiang/O-3820-2015; Nan, Tianxiang/A-8020-2016; Sun, Nian
Xiang/F-9590-2010;
OI Liu, Ming/0000-0002-6310-948X; Zhou, Ziyao/0000-0002-2389-1673; Sun,
Nian Xiang/0000-0002-3120-0094; Nan, Tianxiang/0000-0001-6804-2029
FU AFRL Materials & Manufacturing Directorate Applied Metamaterials
Program; NSF [0746810, 0824008]
FX M.L. and Z.Z. contributed equally to this work. This work was supported
by the AFRL Materials & Manufacturing Directorate Applied Metamaterials
Program and NSF under awards 0746810 and 0824008.
NR 38
TC 83
Z9 85
U1 11
U2 227
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY
SN 0935-9648
J9 ADV MATER
JI Adv. Mater.
PD MAR 13
PY 2013
VL 25
IS 10
BP 1435
EP 1439
DI 10.1002/adma.201203792
PG 5
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 104PR
UT WOS:000316007200009
PM 23303469
ER
PT J
AU Greilich, A
Badescu, SC
Kim, D
Bracker, AS
Gammon, D
AF Greilich, A.
Badescu, S. C.
Kim, D.
Bracker, A. S.
Gammon, D.
TI Optical Measurement and Modeling of Interactions between Two Hole Spins
or Two Electron Spins in Coupled InAs Quantum Dots
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
AB Two electron spins in quantum dots coupled through coherent tunneling are generally acknowledged to approximately obey Heisenberg isotropic exchange. This has not been established for two holes. Here we measure the spectra of two holes and of two electrons in two vertically stacked self-assembled InAs quantum dots using optical spectroscopy as a function of electric and magnetic fields. We find that the exchange is approximately isotropic for both systems, but that significant asymmetric contributions, arising from spin-orbit and Zeeman interactions combined with spatial asymmetries, are required to explain large anticrossings and fine-structure energy splittings in the spectra. Asymmetric contributions to the isotropic Hamiltonian for electrons are of the order of a few percent while those for holes are an order of magnitude larger. DOI: 10.1103/PhysRevLett.110.117402
C1 [Greilich, A.; Badescu, S. C.; Kim, D.; Bracker, A. S.; Gammon, D.] USN, Res Lab, Washington, DC 20375 USA.
[Greilich, A.] Tech Univ Dortmund, D-44221 Dortmund, Germany.
[Badescu, S. C.] USAF, Res Lab, Dayton, OH 45433 USA.
[Kim, D.] Harvard Univ, Cambridge, MA 02138 USA.
RP Greilich, A (reprint author), USN, Res Lab, Washington, DC 20375 USA.
RI Greilich, Alex/A-8927-2009
NR 32
TC 10
Z9 10
U1 0
U2 33
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD MAR 12
PY 2013
VL 110
IS 11
AR 117402
DI 10.1103/PhysRevLett.110.117402
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 106VJ
UT WOS:000316172500028
PM 25166576
ER
PT J
AU Oesch, DW
Sanchez, DJ
Gallegos, AL
Holzman, JM
Brennan, TJ
Smith, JC
Gibson, WJ
Farrell, TC
Kelly, PR
AF Oesch, Denis W.
Sanchez, Darryl J.
Gallegos, Anita L.
Holzman, Jason M.
Brennan, Terry J.
Smith, Julie C.
Gibson, William J.
Farrell, Tom C.
Kelly, Patrick R.
TI Creation of photonic orbital angular momentum by distributed volume
turbulence
SO OPTICS EXPRESS
LA English
DT Article
ID WAVE-FRONT SENSOR; ATMOSPHERIC-TURBULENCE; AGGREGATE BEHAVIOR;
BRANCH-POINTS; LIGHT; SYSTEM; STATES; BEAMS
AB In previous work, we presented theory of how atmospheric turbulence can impart orbital angular momentum to propagating optical waves. In this paper we provide the first experimental demonstration of the detection of orbital angular momentum from distributed volume turbulence through the identification of well-defined, turbulence-induced, optical vortex trails in Shack-Hartmann wave front sensor measurements. (C) 2013 Optical Society of America
C1 [Oesch, Denis W.; Gallegos, Anita L.] Sci Applicat Int Corp, Albuquerque, NM USA.
[Sanchez, Darryl J.; Holzman, Jason M.; Smith, Julie C.; Gibson, William J.; Farrell, Tom C.; Kelly, Patrick R.] USAF, Res Lab, Directed Energy Directorate, Kirtland AFB, NM USA.
[Brennan, Terry J.] Opt Sci Co, Anaheim, CA USA.
RP Oesch, DW (reprint author), Sci Applicat Int Corp, Albuquerque, NM USA.
EM denis.w.oesch@saic.com
FU Air Force Office of Scientific Research
FX We express our gratitude to the Air Force Office of Scientific Research
for their support in funding this research.
NR 26
TC 6
Z9 6
U1 0
U2 10
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD MAR 11
PY 2013
VL 21
IS 5
BP 5440
EP 5455
DI 10.1364/OE.21.005440
PG 16
WC Optics
SC Optics
GA 105WL
UT WOS:000316103300036
PM 23482115
ER
PT J
AU Miller, HC
AF Miller, Harold C.
TI A laser beam quality definition based on induced temperature rise (vol
20, pg 28819, 2012)
SO OPTICS EXPRESS
LA English
DT Correction
AB An erratum is presented to correct an error in an equation used to determine laser beam quality from power-in-the-bucket curves. (C) 2013 Optical Society of America
C1 USAF, Directed Energy Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
RP Miller, HC (reprint author), USAF, Directed Energy Directorate, Res Lab, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM afrl.rdla.org.mbx@kirtland.af.mil
NR 1
TC 0
Z9 0
U1 1
U2 7
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD MAR 11
PY 2013
VL 21
IS 5
BP 5635
EP 5635
DI 10.1364/OE.21.005635
PG 1
WC Optics
SC Optics
GA 105WL
UT WOS:000316103300057
ER
PT J
AU Senkov, ON
Senkova, SV
Miracle, DB
Woodward, C
AF Senkov, O. N.
Senkova, S. V.
Miracle, D. B.
Woodward, C.
TI Mechanical properties of low-density, refractory multi-principal element
alloys of the Cr-Nb-Ti-V-Zr system
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Refractory alloys; Crystal structure; Microstructure; Mechanical
properties
ID HIGH-ENTROPY ALLOYS; NBCRMO0.5TA0.5TIZR ALLOY; MICROSTRUCTURE; DESIGN
AB Room temperature and elevated temperature mechanical properties of four multi-principal element alloys, NbTiVZr, NbTiV2Zr, CrNbTiZr and CrNbTiVZr, are reported. The alloys were prepared by vacuum arc melting followed by hot isostatic pressing and homogenization. Disordered BCC solid solution phases are the major phases in these alloys. The Cr-containing alloys additionally contain an ordered FCC Laves phase. The NbTiVZr and NbTiV2Zr alloys showed good compressive ductility at all studied temperatures while the Cr-containing alloys showed brittle-to-ductile transition occurring somewhere between 298 and 873 K. Strong work hardening was observed in the NbTiVZr and NbTiV2Zr alloys during deformation at room temperature. The alloys had yield strengths of 1105 MPa and 918 MPa, respectively, and their strength continuously increased, exceeding 2000 MPa after similar to 40% compression strain. The CrNbTiZr and CrNbTiVZr alloys showed high yield strength (1260 MPa and 1298 MPa, respectively) but low ductility (6% and 3% compression strain) at room temperature. Strain softening and steady state flow were typical during compression deformation of these alloys at temperatures above 873 K. In these conditions, the alloys survived 50% compression strain without fracture and their yield strength continuously decreased with an increase in temperature. During deformation at 1273 K, the NbTiVZr, NbTiV2Zr, CrNbTIZr, and CrNbTiVZr alloys showed yield strengths of 58 MPa, 72 MPa, 115 MPa and 259 MPa, respectively. (C) 2012 Elsevier B.V. All rights reserved.
C1 [Senkov, O. N.; Senkova, S. V.; Miracle, D. B.; Woodward, C.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Senkov, ON (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM oleg.senkov@wpafb.af.mil
RI Senkov, Oleg/C-7197-2012
OI Senkov, Oleg/0000-0001-5587-415X
FU Air Force Research Laboratory Director's fund; Air Force on-site
[FA8650-10-D-5226]
FX This work was supported through the Air Force Research Laboratory
Director's fund and through the Air Force on-site contract no.
FA8650-10-D-5226 conducted by UES, Inc., Dayton, Ohio.
NR 15
TC 62
Z9 62
U1 12
U2 122
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD MAR 10
PY 2013
VL 565
BP 51
EP 62
DI 10.1016/j.msea.2012.12.018
PG 12
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 104YR
UT WOS:000316033200009
ER
PT J
AU Choi, S
Heller, E
Dorsey, D
Vetury, R
Graham, S
AF Choi, Sukwon
Heller, Eric
Dorsey, Donald
Vetury, Ramakrishna
Graham, Samuel
TI Analysis of the residual stress distribution in AlGaN/GaN high electron
mobility transistors
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID GAN THIN-FILMS; RAMAN-SPECTROSCOPY; OPTICAL-PROPERTIES; GALLIUM NITRIDE;
STRAIN; PHOTOLUMINESCENCE; SAPPHIRE; TEMPERATURE; SI(111);
HETEROSTRUCTURES
AB A comparative analysis of the residual stress distributions across the conductive channel of Ga-face AlGaN/GaN high electron mobility transistors (HEMTs) is presented. Stress was measured by means of micro-Raman spectroscopy and micro-photoluminescence (PL). Raman measurements probed the volume average of the stress through the GaN layer whereas the stress near the GaN surface (AlGaN/GaN heterointerface) was acquired via PL. By combining Raman, PL, and x-ray diffraction, a self-consistent method was developed to accurately determine the variation in magnitude of stress throughout the thickness of the GaN layer. Based on this framework, it is observed in AlGaN/GaN HEMTs that a depth variation in the GaN residual stress occurs near the gate and ohmic electrodes. At these regions, the stress near the AlGaN/GaN interface (or GaN surface) exhibits a tensile shift compared to the stress averaged through the entire thickness of GaN. Across the conductive channel (away from the metal pads), the bulk average stress and the stress near this interface remain nearly identical, showing little evidence of a vertical gradient. It is expected that the induced tensile strain at the drain side gate edge will have an impact on device reliability by contributing to the elastic energy built in the AlGaN barrier in addition to the inverse piezoelectric contribution at operating conditions, which may lead to formation of crystallographic defects. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4794009]
C1 [Choi, Sukwon; Graham, Samuel] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA.
[Heller, Eric; Dorsey, Donald] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Vetury, Ramakrishna] RFMD, Def & Power Business Unit, Charlotte, NC 28269 USA.
RP Choi, S (reprint author), Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA.
EM sgraham@gatech.edu
FU Air Force Research Laboratory High-Reliability Electronics Virtual
Center team
FX This work was supported by the Air Force Research Laboratory
High-Reliability Electronics Virtual Center team.
NR 42
TC 21
Z9 21
U1 4
U2 52
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD MAR 7
PY 2013
VL 113
IS 9
AR 093510
DI 10.1063/1.4794009
PG 8
WC Physics, Applied
SC Physics
GA 105QJ
UT WOS:000316086500020
ER
PT J
AU Sivapalan, ST
Vella, JH
Yang, TK
Dalton, MJ
Haley, JE
Cooper, TM
Urbas, AM
Tan, LS
Murphy, CJ
AF Sivapalan, Sean T.
Vella, Jarrett H.
Yang, Timothy K.
Dalton, Matthew J.
Haley, Joy E.
Cooper, Thomas M.
Urbas, Augustine M.
Tan, Loon-Seng
Murphy, Catherine J.
TI Off-Resonant Two-Photon Absorption Cross-Section Enhancement of an
Organic Chromophore on Gold Nanorods
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID SURFACE-PLASMON RESONANCE; METAL NANOPARTICLES; OPTICAL-PROPERTIES;
FLUORESCENCE
AB Surface-plasmon-initiated interference effects of polyelectrolyte-coated gold nano-rods on the two-photon absorption of an organic chromophore were investigated. With polyelectrolyte-bearing gold nanorods of two, four, six, and eight layers, the role of the plasmonic fields as function of distance on such effects was examined An unusual distance dependence was found: enhancements in the two-photon cross-section were at a minimum at an intermediate distance, then rose again at a further distance. The observed values of enhancement were compared to theoretical predictions using finite element analysis and showed good agreement due to constructive and destructive interference effects.
C1 [Sivapalan, Sean T.; Murphy, Catherine J.] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
[Yang, Timothy K.; Murphy, Catherine J.] Univ Illinois, Dept Chem, Urbana, IL 61801 USA.
[Vella, Jarrett H.; Dalton, Matthew J.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Vella, Jarrett H.; Dalton, Matthew J.] Wyle Aerosp Grp, Dayton, OH 45431 USA.
[Haley, Joy E.; Cooper, Thomas M.; Urbas, Augustine M.; Tan, Loon-Seng] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Murphy, CJ (reprint author), Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
EM murphycj@illinois.edu
RI Tan, Loon-Seng/F-6985-2012;
OI Tan, Loon-Seng/0000-0002-2134-9290; Murphy,
Catherine/0000-0001-7066-5575
FU University of Illinois at Urbana-Champaign from the NIH National Cancer
Institute Alliance for Nanotechnology in Cancer 'Midwest Cancer
Nanotechnology Training Center' Grant [R25 CA154015A]; AFOSR Grant [FA
9550-09-1-0246]
FX S.T.S. acknowledges support from the University of Illinois at
Urbana-Champaign from the NIH National Cancer Institute Alliance for
Nanotechnology in Cancer 'Midwest Cancer Nanotechnology Training Center'
Grant R25 CA154015A. This work was supported by AFOSR Grant Number FA
9550-09-1-0246.
NR 22
TC 7
Z9 7
U1 0
U2 50
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1948-7185
J9 J PHYS CHEM LETT
JI J. Phys. Chem. Lett.
PD MAR 7
PY 2013
VL 4
IS 5
BP 749
EP 752
DI 10.1021/jz4000774
PG 4
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 105CU
UT WOS:000316044000010
PM 23687561
ER
PT J
AU Yang, S
Brant, AT
Giles, NC
Halliburton, LE
AF Yang, Shan
Brant, A. T.
Giles, N. C.
Halliburton, L. E.
TI Intrinsic small polarons in rutile TiO2
SO PHYSICAL REVIEW B
LA English
DT Article
ID ANATASE; KINETICS; DEFECTS
AB Electron paramagnetic resonance (EPR) is used to identify the intrinsic electron small polaron in TiO2 crystals having the rutile structure. These self-trapped electrons are produced at very low temperature with 442 nm laser light. The defects form when a Ti4+ ion at a regular lattice site traps an electron and converts to a Ti3+ (3d(1)) ion. They become thermally unstable above similar to 15 K. An activation energy of 24 meV describes this "release" of the electrons (either by a hopping motion or directly to the conduction band). The g matrix is obtained from the angular dependence of the EPR spectrum. Principal values are 1.9807, 1.9786, and 1.9563 and principal axes are along high-symmetry directions in the crystal. The unpaired electron occupies an vertical bar x(2) - y(2)> orbital where x and y are in the equatorial plane of the TiO6 unit and y is the [001] direction. These intrinsic small polarons serve as a prototype for many of the defect-associated Ti3+ ions often observed in this material. They also can be used as a computational test case to evaluate the validity of different approximations presently being employed in density-functional-theory modeling of point defects in TiO2 and other transition-metal oxides. DOI: 10.1103/PhysRevB.87.125201
C1 [Yang, Shan; Halliburton, L. E.] W Virginia Univ, Dept Phys, Morgantown, WV 26505 USA.
[Brant, A. T.; Giles, N. C.] USAF, Dept Engn Phys, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Yang, S (reprint author), W Virginia Univ, Dept Phys, Morgantown, WV 26505 USA.
EM Larry.Halliburton@mail.wvu.edu
RI Yang, Shan /F-5020-2012
FU National Research Council
FX One of the authors (A.T.B.) acknowledges the support of the National
Research Council.
NR 34
TC 28
Z9 28
U1 5
U2 66
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD MAR 7
PY 2013
VL 87
IS 12
AR 125201
DI 10.1103/PhysRevB.87.125201
PG 6
WC Physics, Condensed Matter
SC Physics
GA 100VX
UT WOS:000315733700002
ER
PT J
AU McNamara, LF
Caton, RG
Parris, RT
Pedersen, TR
Thompson, DC
Wiens, KC
Groves, KM
AF McNamara, L. F.
Caton, R. G.
Parris, R. T.
Pedersen, T. R.
Thompson, D. C.
Wiens, K. C.
Groves, K. M.
TI Signatures of equatorial plasma bubbles in VHF satellite scintillations
and equatorial ionograms
SO RADIO SCIENCE
LA English
DT Article
DE equatorial ionosphere; equatorial plasma bubbles
ID SPREAD-F; PROPAGATION; DRIFTS; SOUTH
AB Since their discovery in the 1970s, equatorial plasma bubbles (EPBs) have been invoked to explain the propagation of VHF signals on trans-equatorial circuits at night, and blamed for highly detrimental scintillation of VHF and GHz trans-ionospheric communications signals in equatorial regions. Over the last four decades, the properties of EPBs have been deduced by multiple techniques such as incoherent scatter radar, 630nm airglow, depletions in GPS total electron content observations, VHF and GHz scintillations, and HF observations by ionosondes. The initiation and evolution of EPBs have by now been successfully modeled and a good understanding developed of the underlying physics. However, different communities tend to concentrate on a single observing technique, without regard to whether the different techniques provide a consistent physical picture. In contrast, this paper discusses two very different types of observations made on a night-by-night basis during the COPEX campaign of late 2002 in Brazil, namely, VHF scintillations and ionograms, and shows that the two methods of observation can provide a consistent interpretation of the properties of EPBs. For example, an EPB seen as an eastward drifting scintillation event can also be seen as an extra ionogram reflection trace that moves closer to and then away from the ionosonde site. The scintillations are attributed to strong gradients across the walls of an EPB, whereas the extra ionogram traces are attributed to oblique reflection of the ionosonde signals from the walls of the EPB.
C1 [McNamara, L. F.; Caton, R. G.; Parris, R. T.; Pedersen, T. R.; Thompson, D. C.; Wiens, K. C.] USAF, Res Lab, AFRL RVBXI, Albuquerque, NM 87117 USA.
[Groves, K. M.] Boston Coll, Inst Sci Res, Boston, MA USA.
RP McNamara, LF (reprint author), USAF, Res Lab, AFRL RVBXI, Albuquerque, NM 87117 USA.
EM leo.mcnamara@kirtland.af.mil
FU Air Force Office of Scientific Research
FX We thank Bodo Reinisch for helpful discussions. T.R.P. was partially
supported by the Air Force Office of Scientific Research.
NR 30
TC 4
Z9 5
U1 1
U2 7
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0048-6604
J9 RADIO SCI
JI Radio Sci.
PD MAR-APR
PY 2013
VL 48
IS 2
BP 89
EP 101
DI 10.1002/rds.20025
PG 13
WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology &
Atmospheric Sciences; Remote Sensing; Telecommunications
SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology &
Atmospheric Sciences; Remote Sensing; Telecommunications
GA 150WW
UT WOS:000319423200001
ER
PT J
AU McNamara, LF
Angling, MJ
Elvidge, S
Fridman, SV
Hausman, MA
Nickisch, LJ
McKinnell, LA
AF McNamara, Leo F.
Angling, Matthew J.
Elvidge, Sean
Fridman, Sergey V.
Hausman, Mark A.
Nickisch, L. J.
McKinnell, Lee-Anne
TI Assimilation procedures for updating ionospheric profiles below the F2
peak
SO RADIO SCIENCE
LA English
DT Article
DE ionosphere; assimilation
ID IONOGRAMS; MODELS
AB This paper describes and compares two real-time assimilative ionospheric models, with an emphasis on their ability to provide accurate profiles of the electron density below the peak of the F2 layer at a midlatitude location, given automatically processed vertical incidence ionograms at a single location. The two models are specifically oriented toward several important practical applications of high-frequency (HF) radio propagation: HF communications, single station location of HF transmitters, and coordinate registration for OTHR. Both models start with the International Reference Ionosphere (IRI) as a background ionosphere and assimilate digisonde observations (either the ionogram or the profile) and available GPS total electron content observations. The digisonde data from one site in the Republic of South Africa (RSA) provide the ionosonde assimilation data, while the other three digisondes in the RSA provide the ground-truth observations of foF2, hmF2, and the plasma frequency profile. Since the four RSA digisondes receive each other's transmissions, maximum observed frequencies have also been used as ground truth. The models tested have both been found to provide significant improvements over the IRI and to have similar accuracies for the study interval (September 2011). The errors of the models are very close to the minimum achievable errors for all the validation parameters, which seem to be set by the ubiquitous traveling ionospheric disturbances being different at the different locations. For the optimum ground-truth location similar to 685km from the digisonde providing the assimilation data, the RMS errors in foF2 were found to be 0.2MHz (night) and 0.5MHz (day).
C1 [McNamara, Leo F.] USAF, Res Lab, AFRL, RVBXI, Albuquerque, NM 87117 USA.
[Angling, Matthew J.; Elvidge, Sean] QinetiQ, Ctr RF Operat Environm, Malvern, Worcs, England.
[Elvidge, Sean] Univ Birmingham, Poynting Res Inst, Birmingham, W Midlands, England.
[Fridman, Sergey V.; Hausman, Mark A.; Nickisch, L. J.] North West Res Associates, Monterey, CA USA.
[McKinnell, Lee-Anne] South African Natl Space Agcy, Hermanus, South Africa.
RP McNamara, LF (reprint author), USAF, Res Lab, AFRL, RVBXI, Albuquerque, NM 87117 USA.
EM leo.mcnamara@kirtland.af.mil
OI Elvidge, Sean/0000-0003-2846-0730
FU AFRL [FA9453-11-C-0157]
FX EDAM was developed as part of the UK Ministry of Defence ISTAR and
Sensors Domain Research Programme. The development of GPSII is currently
funded in part by AFRL under contract FA9453-11-C-0157.
NR 25
TC 7
Z9 8
U1 0
U2 14
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0048-6604
EI 1944-799X
J9 RADIO SCI
JI Radio Sci.
PD MAR-APR
PY 2013
VL 48
IS 2
BP 143
EP 157
DI 10.1002/rds.20020
PG 15
WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology &
Atmospheric Sciences; Remote Sensing; Telecommunications
SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology &
Atmospheric Sciences; Remote Sensing; Telecommunications
GA 150WW
UT WOS:000319423200007
ER
PT J
AU Vickers, H
Kosch, MJ
Sutton, E
Ogawa, Y
La Hoz, C
AF Vickers, H.
Kosch, M. J.
Sutton, E.
Ogawa, Y.
La Hoz, C.
TI Thermospheric atomic oxygen density estimates using the EISCAT Svalbard
Radar
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID INCOHERENT SCATTER MEASUREMENTS; F-REGION STORMS; GEOMAGNETIC STORMS;
ACCELEROMETER DATA; STATISTICAL-MODEL; MAGNETIC STORMS; NEUTRAL DENSITY;
CHAMP; SOLAR; IONOSPHERE
AB Coupling between the ionized and neutral atmosphere through particle collisions allows an indirect study of the neutral atmosphere through measurements of ionospheric plasma parameters. We estimate the neutral density of the upper thermosphere above similar to 250 km with the European Incoherent Scatter Svalbard Radar (ESR) using the year-long operations of the International Polar Year from March 2007 to February 2008. The simplified momentum equation for atomic oxygen ions is used for field-aligned motion in the steady state, taking into account the opposing forces of plasma pressure gradients and gravity only. This restricts the technique to quiet geomagnetic periods, which applies to most of the International Polar Year during the recent very quiet solar minimum. The method works best in the height range similar to 300-400 km where our assumptions are satisfied. Differences between Mass Spectrometer and Incoherent Scatter and ESR estimates are found to vary with altitude, season, and magnetic disturbance, with the largest discrepancies during the winter months. A total of 9 out of 10 in situ passes by the CHAMP satellite above Svalbard at 350 km altitude agree with the ESR neutral density estimates to within the error bars of the measurements during quiet geomagnetic periods.
C1 [Vickers, H.; La Hoz, C.] Univ Tromso, Inst Phys & Technol, N-9001 Tromso, Norway.
[Kosch, M. J.] Univ Lancaster, Dept Phys, Lancaster LA1 4YW, England.
[Sutton, E.] USAF, Res Lab, Kirtland AFB, NM USA.
[Ogawa, Y.] Natl Inst Polar Res, Tokyo, Japan.
[Kosch, M. J.] Univ KwaZulu Natal, Sch Phys, ZA-4001 Durban, South Africa.
RP Vickers, H (reprint author), Univ Tromso, Inst Phys & Technol, N-9001 Tromso, Norway.
EM hannah.vickers@uit.no
RI Sutton, Eric/A-1574-2016;
OI Sutton, Eric/0000-0003-1424-7189; Kosch, Michael
Jurgen/0000-0003-2846-3915
FU China (CRIRP); Finland (SA); Germany (DFG); Japan (NIPR); Japan (STEL);
Norway (NFR); Sweden (VR); United Kingdom (NERC)
FX EISCAT is an international association supported by research
organizations in China (CRIRP), Finland (SA), Germany (DFG, until end of
2011), Japan (NIPR and STEL), Norway (NFR), Sweden (VR) and the United
Kingdom (NERC). We are grateful to Truls Hansen and Magnar Johnsen at
Tromso Geophysical Observatory for help with accessing and acquisition
of magnetometer data used in this study, and to Bill Rideout at MIT
Haystack Observatory for providing Madrigal database support.
NR 56
TC 9
Z9 9
U1 5
U2 30
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-9380
EI 2169-9402
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR
PY 2013
VL 118
IS 3
BP 1319
EP 1330
DI 10.1002/jgra.50169
PG 12
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 135FP
UT WOS:000318274000033
ER
PT J
AU Finke, C
Butts, J
Mills, R
Grimaila, M
AF Finke, Cindy
Butts, Jonathan
Mills, Robert
Grimaila, Michael
TI Enhancing the security of aircraft surveillance in the next generation
air traffic control system
SO INTERNATIONAL JOURNAL OF CRITICAL INFRASTRUCTURE PROTECTION
LA English
DT Article
DE Air traffic control; ADS-B; NextGen; Format-preserving encryption; FFX
algorithm
AB The U.S. air traffic control system is reliant on legacy systems that artificially limit air traffic capacity. With the demand for air transportation increasing each year, the U.S. Federal Aviation Administration has introduced the Next Generation (NextGen) upgrade to modernize the air traffic control system. Automatic Dependent Surveillance-Broadcast (ADS-B), a key component of the NextGen upgrade, enables an aircraft to generate and broadcast digital messages that contain the GPS coordinates of aircraft. The incorporation of ADS-B is intended to provide enhanced accuracy and efficiency of surveillance as well as aircraft safety. The open design of the system, however, introduces some security concerns. This paper evaluates the limitations of the legacy systems currently used in air traffic control and explores the feasibility of employing format-preserving encryption, specifically the FFX algorithm, in the ADS-B environment. The ability of the algorithm to confuse and diffuse predictable message input is examined using message entropy as a metric. Based on the analysis, recommendations are provided that highlight areas which should be examined for inclusion in the ADS-B upgrade plan. Published by Elsevier B.V.
C1 [Finke, Cindy; Butts, Jonathan; Mills, Robert; Grimaila, Michael] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Butts, J (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM jonathan.butts@afit.edu
NR 21
TC 6
Z9 7
U1 2
U2 14
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1874-5482
J9 INT J CRIT INFR PROT
JI Int. J. Crit. Infrastruct. Prot.
PD MAR
PY 2013
VL 6
IS 1
BP 3
EP 11
DI 10.1016/j.ijcip.2013.02.001
PG 9
WC Computer Science, Information Systems; Engineering, Multidisciplinary
SC Computer Science; Engineering
GA 141SA
UT WOS:000318745600002
ER
PT J
AU Norris, AG
Palazotto, AN
Cobb, RG
AF Norris, Aaron G.
Palazotto, Anthony N.
Cobb, Richard G.
TI Experimental Structural Dynamic Characterization of the Hawkmoth
(Manduca Sexta) Forewing
SO INTERNATIONAL JOURNAL OF MICRO AIR VEHICLES
LA English
DT Article
ID HOVERING INSECT FLIGHT; AERODYNAMICS
AB While many bio-inspired flapping wing micro air vehicle wing designs continue to be conceived and studied in earnest, a general consensus of which physical attributes of the biological entity are important for flight is still at-large. It is proposed herein that the eigenstructure of the wing should figure prominently among rigorous engineering metrics for guiding flapping wing micro air vehicle wing designs at the scales of large insects. With virtually no compelling work done in this area to date, the method and results of system identification tests for the forewings of a representative sample of hawkmoth (Manduca Sexta) are presented, revealing the underlying structural nature of this incredibly agile flyer's wings. Despite their inherent biological variability, these wings show very little variability in eigenstructure which may suggest it as a critical attribute for robust flight. Further supporting this hypothesis, the wings of four other insect species are briefly examined and show remarkable similarity with the hawkmoth wing's eigenstructure.
C1 [Norris, Aaron G.] USAF, Res Lab, Munit Directorate, Wright Patterson AFB, OH 45433 USA.
[Palazotto, Anthony N.; Cobb, Richard G.] USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH USA.
RP Norris, AG (reprint author), USAF, Res Lab, Munit Directorate, Wright Patterson AFB, OH 45433 USA.
FU Air Force Research Laboratory; Air Force Office of Scientific Research
FX The authors are thankful for the support provided by Jay Anderson, Chris
Zickefoose and Sean Miller of the Air Force Institute of Technology and
to Mark Willis and Jennifer Avondet of the Willis Laboratory at Case
Western Reserve University. Their assistance, along with the financial
support of the Air Force Research Laboratory and Air Force Office of
Scientific Research enabled this research. The views expressed in this
paper are those of the authors and do not reflect the official policy or
position of the United States Air Force, the Department of Defense, or
the United States Government.
NR 23
TC 1
Z9 1
U1 0
U2 4
PU MULTI-SCIENCE PUBL CO LTD
PI BRENTWOOD
PA 5 WATES WAY, BRENTWOOD CM15 9TB, ESSEX, ENGLAND
SN 1756-8293
J9 INT J MICRO AIR VEH
JI Int. J. Micro Air Veh.
PD MAR
PY 2013
VL 5
IS 1
BP 39
EP 54
DI 10.1260/1756-8293.5.1.39
PG 16
WC Engineering, Aerospace
SC Engineering
GA 137YX
UT WOS:000318475700003
ER
PT J
AU DeLuca, AM
Reeder, MF
Cobb, RG
AF DeLuca, Anthony M.
Reeder, Mark F.
Cobb, Richard G.
TI An Experimental Investigation into the Effect of Flap Angles for a
Piezo-Driven Wing
SO INTERNATIONAL JOURNAL OF MICRO AIR VEHICLES
LA English
DT Article
ID HOVERING INSECT FLIGHT; HAWKMOTH MANDUCA-SEXTA; MICRO-AIR VEHICLES;
FLYING INSECTS; INDUCED FLOW; AERODYNAMICS; ROTATION; MECHANISMS;
KINEMATICS; DESIGN
AB This article presents a comparison of results from six degree of freedom force and moment measurements and Particle Image Velocimetry (PIV) data taken on the Air Force Institute of Technology's (AFIT) piezoelectrically actuated, biomimetically designed Hawkmoth, Manduca Sexta, class engineered wing, at varying amplitudes and flapping frequencies, for both trimmed and asymmetric flapping conditions to assess control moment changes. To preserve test specimen integrity, the wing was driven at a voltage amplitude 50% below the maximum necessary to achieve the maximal Hawkmoth total stroke angle. 86 degrees and 65 degrees stroke angles were achieved for the trimmed and asymmetric tests respectively. Flapping tests were performed at system structural resonance, and at +/- 10% off system resonance at a single amplitude, and PZT power consumption was calculated for each test condition. Two-dimensional PIV visualization measurements were taken transverse to the wing planform, recorded at the mid-span, for a single frequency and amplitude setting, for both trimmed and asymmetric flapping to correlate with the 6-DoF balance data. Linear velocity data was extracted from the 2-D PIV imagery at +/- 1/2 and +/- 1 chord locations above and below the wing, and the mean velocities were calculated for four separate wing phases during the flap cycle. The mean forces developed during a flap cycle were approximated using a modification of the Rankine-Froude axial actuator disk model to calculate the transport of momentum flux as a measure of vertical thrust produced during a static hover flight condition. Values of vertical force calculated from the 2-D PIV measurements were within 20% of the 6-DOF force balance experiments. Power calculations confirmed flapping at system resonance required less power than at off resonance frequencies, which is a critical finding necessary for future vehicle design considerations.
C1 [DeLuca, Anthony M.; Reeder, Mark F.; Cobb, Richard G.] USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
RP DeLuca, AM (reprint author), USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
EM anthony.deluca@afit.edu; mark.reeder@afit.edu; richard.cobb@afit.edu
FU Air Force Research Lab (AFRL/RQ)
FX The authors want to acknowledge Dr. Greg Parker from the Air Force
Research Lab (AFRL/RQ) for supporting the AFIT FWMAV research project.
DISCLAIMER: The views expressed in this paper are the those of the
authors and do not reflect the official policy or position of the United
States Air Force, Department of Defense, or the Government of the United
States.
NR 55
TC 2
Z9 2
U1 0
U2 13
PU MULTI-SCIENCE PUBL CO LTD
PI BRENTWOOD
PA 5 WATES WAY, BRENTWOOD CM15 9TB, ESSEX, ENGLAND
SN 1756-8293
J9 INT J MICRO AIR VEH
JI Int. J. Micro Air Veh.
PD MAR
PY 2013
VL 5
IS 1
BP 55
EP 92
DI 10.1260/1756-8293.5.1.55
PG 38
WC Engineering, Aerospace
SC Engineering
GA 137YX
UT WOS:000318475700004
ER
PT J
AU Flory, J
Kanel, SR
Racz, L
Impellitteri, CA
Silva, RG
Goltz, MN
AF Flory, Jason
Kanel, Sushil R.
Racz, LeeAnn
Impellitteri, Christopher A.
Silva, Rendahandi G.
Goltz, Mark N.
TI Influence of pH on the transport of silver nanoparticles in saturated
porous media: laboratory experiments and modeling
SO JOURNAL OF NANOPARTICLE RESEARCH
LA English
DT Article
DE Silver nanoparticles; Environmental fate and transport;
Advection-dispersion model; Irreversible and reversible attachment;
Groundwater contamination
ID ZERO-VALENT IRON; RISK-ASSESSMENT; SURFACE-CHARGE; AGGREGATION;
DEPOSITION; NANOMATERIALS; ATTACHMENT; NANOSILVER; TOXICITY; EXPOSURE
AB Given the ubiquity of silver nanoparticles (AgNPs) and their potential for toxic effects on both humans and the environment, it is important to understand their environmental fate and transport. The purpose of this study is to gain information on the transport properties of commercial AgNP suspensions in a glass bead-packed column under saturated flow conditions at different solution pH levels. Commercial AgNPs were characterized using high-resolution transmission electron microscopy, dynamic light scattering, X-ray photoelectron spectroscopy, ultraviolet visible spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray diffraction. Transport data were collected at different pH levels (4, 6.5, 9, and 11) at fixed ionic strength. Capture of AgNPs increased as the pH of the solution increased from 4 to 6.5. Further increase in pH to 9 and 11 decreased the attachment of AgNPs to the glass beads. AgNP concentration versus time breakthrough data were simulated using an advection-dispersion model incorporating both irreversible and reversible attachment. In particular, a reversible attachment model is required to simulate breakthrough curve tailing at near neutral pH, when attachment is most significant. The laboratory and modeling study reveals that for natural groundwaters, AgNP transport in porous media may be retarded due to capture; but ultimately, most of the mass may be slowly released over time.
C1 [Flory, Jason; Kanel, Sushil R.; Racz, LeeAnn; Goltz, Mark N.] USAF, Dept Syst & Engn Management, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Impellitteri, Christopher A.] US EPA, Cincinnati, OH 45268 USA.
[Silva, Rendahandi G.] US EPA, Shaw Environm & Infrastruct, US EPA Test & Evaluat Facil, Natl Risk Management Res Lab, Cincinnati, OH 45204 USA.
RP Kanel, SR (reprint author), USAF, Dept Syst & Engn Management, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM sushil.kanel.ctr@afit.edu; mark.goltz@afit.edu
OI Kanel, Sushil/0000-0002-6805-4326; Goltz, Mark/0000-0003-3601-6453
FU Air Force Medical Support Agency's Research and Development Division
(AFMSA/SGRS), Department of Defense [F1ATD41003G004]
FX This research was supported by Air Force Medical Support Agency's
Research and Development Division (AFMSA/SGRS), Department of Defense
Funding Document No. F1ATD41003G004. Authors acknowledge Dr. Daniel
Felker for training student in ICP analysis and gratefully acknowledge
the technical assistance efforts of undergraduate students Nicole
Jacques and Chelsea Riegel. The authors thank Barb Miller (University of
Dayton Research Institute, Dayton, OH) and the NEST Laboratory,
(University of Dayton, Dayton, OH) for assisting with the HRTEM
analysis. This work was performed while Dr. Sushil R. Kanel was in the
National Research Council Fellowship Program at the Air Force Institute
of Technology, Wright Patterson Air Force Base, OH. Any opinions
expressed in this paper are those of the author(s) and do not,
necessarily, reflect the official positions and policies of the USEPA,
the United States Air Force, Department of Defense, or the U.S.
Government. Any mention of products or trade names does not constitute
recommendation for use by the USEPA.
NR 34
TC 8
Z9 8
U1 0
U2 50
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1388-0764
J9 J NANOPART RES
JI J. Nanopart. Res.
PD MAR
PY 2013
VL 15
IS 3
AR 1484
DI 10.1007/s11051-013-1484-x
PG 11
WC Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials
Science, Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 138ZP
UT WOS:000318551300029
ER
PT J
AU Garmann, DJ
Visbal, MR
Orkwis, PD
AF Garmann, Daniel J.
Visbal, Miguel R.
Orkwis, Paul D.
TI Three-dimensional flow structure and aerodynamic loading on a revolving
wing
SO PHYSICS OF FLUIDS
LA English
DT Article
DE aerodynamics; aerospace components; computational fluid dynamics;
external flows; flow simulation; numerical analysis; vortices
ID FINITE-DIFFERENCE SCHEMES; LARGE-EDDY SIMULATION; LOW REYNOLDS-NUMBERS;
INSECT FLIGHT; VORTEX; BUMBLEBEES; MECHANICS; EQUATIONS; ROTATION; GRIDS
AB A numerical study is conducted to examine the vortex structure and aerodynamic loading on a revolving wing in quiescent flow. A high-fidelity, implicit large eddy simulation technique is employed to simulate a revolving wing configuration consisting of a single, aspect-ratio-one rectangular plate extended out a distance of half a chord from the rotational axis at a fixed angle relative to the axis. Shortly after the onset of the motion, the rotating wing generates a coherent vortex system along the leading-edge. This vortex system remains attached throughout the motion for the range of Reynolds numbers explored, despite the unsteadiness and vortex breakdown observed at higher Reynolds numbers. The average and instantaneous wing loading also increases with Reynolds number. At a fixed Reynolds number, the attachment of the leading-edge vortex is also shown to be insensitive to the geometric angle of the wing. Additionally, the flow structure and forcing generated by a purely translating wing is investigated and compared with that of the revolving wing. Similar features are present at the inception of the motion, however, the two flows evolve very differently for the remainder of the maneuver. Comparisons of the revolving wing simulations with recent experimental particle image velocimetry (PIV) measurements using a new PIV-like data reduction technique applied to the computational solution show very favorable agreement. The success of the data reduction technique demonstrates the need to compare computations and experiments of differing resolutions using similar data-analysis techniques. [http://dx.doi.org/10.1063/1.4794753]
C1 [Garmann, Daniel J.; Visbal, Miguel R.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Orkwis, Paul D.] Univ Cincinnati, Cincinnati, OH 45221 USA.
RP Garmann, DJ (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Daniel.Garmann@wpafb.af.mil
FU AFOSR
FX This work is supported in part by AFOSR under a task monitored by Dr. D.
Smith and also by a grant of HPC time from the DoD HPC Shared Resource
Centers at AFRL and ERDC. The authors would like to thank Dr. C. Ozen
and Professor D. Rockwell of Lehigh University for providing their
experimental results and details of the measurements.
NR 55
TC 28
Z9 29
U1 0
U2 20
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 1070-6631
J9 PHYS FLUIDS
JI Phys. Fluids
PD MAR
PY 2013
VL 25
IS 3
AR 034101
DI 10.1063/1.4794753
PG 27
WC Mechanics; Physics, Fluids & Plasmas
SC Mechanics; Physics
GA 117KK
UT WOS:000316951900024
ER
PT J
AU Franzi, M
Gilgenbach, R
Lau, YY
Hoff, B
Greening, G
Zhang, P
AF Franzi, Matthew
Gilgenbach, Ronald
Lau, Y. Y.
Hoff, Brad
Greening, Geoff
Zhang, Peng
TI Passive mode control in the recirculating planar magnetron
SO PHYSICS OF PLASMAS
LA English
DT Article
AB Preliminary experiments of the recirculating planar magnetron microwave source have demonstrated that the device oscillates but is susceptible to intense mode competition due, in part, to poor coupling of RF fields between the two planar oscillators. A novel method of improving the cross-oscillator coupling has been simulated in the periodically slotted mode control cathode (MCC). The MCC, as opposed to a solid conductor, is designed to electromagnetically couple both planar oscillators by allowing for the propagation of RF fields and electrons through resonantly tuned gaps in the cathode. Using the MCC, a 12-cavity anode block with a simulated 1 GHz and 0.26 c phase velocity (where c is the speed of light) was able to achieve in-phase oscillations between the two sides of the device in as little as 30 ns. An analytic study of the modified resonant structure predicts the MCC's ability to direct the RF fields to provide tunable mode separation in the recirculating planar magnetron. The self-consistent solution is presented for both the degenerate even (in phase) and odd (180 degrees out of phase) modes that exist due to the twofold symmetry of the planar magnetrons. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4794967]
C1 [Franzi, Matthew; Gilgenbach, Ronald; Lau, Y. Y.; Greening, Geoff; Zhang, Peng] Univ Michigan, Plasma Pulsed Power & Microwave Lab, Nucl Engn & Radiol Sci Dept, Ann Arbor, MI 48109 USA.
[Hoff, Brad] USAF, Res Lab, Kirtland AFB, NM 87117 USA.
RP Franzi, M (reprint author), Univ Michigan, Plasma Pulsed Power & Microwave Lab, Nucl Engn & Radiol Sci Dept, Ann Arbor, MI 48109 USA.
RI Zhang, Peng/C-8257-2011
OI Zhang, Peng/0000-0003-0606-6855
FU Air Force Office of Scientific Research [FA9550-10-1-0104]; Air Force
Research Laboratory; L-3 Communications Electron Devices
FX This work was supported by the Air Force Office of Scientific Research
under Grant No. FA9550-10-1-0104, the Air Force Research Laboratory, and
L-3 Communications Electron Devices.
NR 22
TC 8
Z9 8
U1 0
U2 5
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 1070-664X
J9 PHYS PLASMAS
JI Phys. Plasmas
PD MAR
PY 2013
VL 20
IS 3
AR 033108
DI 10.1063/1.4794967
PG 8
WC Physics, Fluids & Plasmas
SC Physics
GA 122DA
UT WOS:000317295200060
ER
PT J
AU Basu, S
Hyde, MW
Cusumano, SJ
Marciniak, MA
Fiorino, ST
AF Basu, Santasri
Hyde, Milo W.
Cusumano, Salvatore J.
Marciniak, Michael A.
Fiorino, Steven T.
TI Examining the validity of using a Gaussian Schell-model source to model
the scattering of a fully coherent Gaussian beam from a rough impedance
surface
SO OPTICAL ENGINEERING
LA English
DT Article
DE Gaussian Schell-model; rough surface scattering; impedance surface;
method of moments
ID ATMOSPHERIC-TURBULENCE; SIMULATION; PROPAGATION; FIELDS
AB Military applications that use adaptive optics (AO) often require a point source beacon at the target to measure and correct for wavefront aberrations introduced by atmospheric turbulence. However, turbulence prevents the formation of such a point beacon. The extended beacons that are created instead have finite spatial extents and exhibit varying degrees of spatial coherence. Modeling these extended beacons using a Gaussian Schell-model (GSM) form for the autocorrelation function would be a convenient approach due to the analytical tractability of Gaussian functions. We examine the validity of using such a model by evaluating the field scattered from a rough impedance surface using a full-wave computational technique called the method of moments (MoM). The MoM improves the fidelity of the analysis since it captures all the physics of the laser-target interaction, such as masking, shadowing, multiple reflections, etc. Two rough-surface targets with different roughness statistics are analyzed. The simulation results are verified with experimental bidirectional reflectance distribution function measurements. It is seen that for rough surfaces, in general, the scattered-field autocorrelation function is not of a GSM form. However, under certain conditions, modeling an extended beacon as a GSM source is legitimate. This analysis will aid in understanding the behavior of extended beacons and how they affect the overall performance of an AO system. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. [DOI: 10.1117/1.OE.52.3.038001]
C1 [Basu, Santasri; Fiorino, Steven T.] USAF, Inst Technol, Dept Engn Phys, Ctr Directed Energy, Wright Patterson AFB, OH 45433 USA.
[Hyde, Milo W.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
[Cusumano, Salvatore J.] MZA Associates Corp, Dayton, OH USA.
[Marciniak, Michael A.] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
RP Basu, S (reprint author), USAF, Inst Technol, Dept Engn Phys, Ctr Directed Energy, Wright Patterson AFB, OH 45433 USA.
EM santasri.basu.ctr.in@afit.edu
OI Marciniak, Michael/0000-0003-2879-5565
FU appointment to the Postgraduate Research Participation Program at AFIT
FX The authors would like to thank Dr. Brij Agrawal, director of the
Adaptive Optics Center of Excellence for National Security at Naval
Postgraduate School, Monterey for funding this research. A special
thanks to Dr. Stephen Nauyoks and the graduate students at the Optical
Scatter Lab at the Air Force Institute of Technology (AFIT) for
providing the experimental data. This research was supported in part by
an appointment to the Postgraduate Research Participation Program at
AFIT administered by the Oak Ridge Institute for Science and Education
through an interagency agreement between the U.S. Department of Energy
and AFIT.
NR 34
TC 5
Z9 7
U1 0
U2 8
PU SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA
SN 0091-3286
EI 1560-2303
J9 OPT ENG
JI Opt. Eng.
PD MAR
PY 2013
VL 52
IS 3
AR 038001
DI 10.1117/1.OE.52.3.038001
PG 9
WC Optics
SC Optics
GA 134XB
UT WOS:000318248000047
ER
PT J
AU Look, DC
Leedy, KD
Kiefer, A
Claflin, B
Itagaki, N
Matsushima, K
Surhariadi, I
AF Look, David C.
Leedy, Kevin D.
Kiefer, Arnold
Claflin, Bruce
Itagaki, Naho
Matsushima, Koichi
Surhariadi, Iping
TI Model for thickness dependence of mobility and concentration in highly
conductive zinc oxide
SO OPTICAL ENGINEERING
LA English
DT Article
DE zinc oxide; mobility; thickness dependence; Hall effect; reflectance
ID ZNO MATERIALS; FILMS; PLASMONICS; DEVICES
AB The dependences of the 294 and 10 K mobility mu and volume carrier concentration n on thickness (d = 25 to 147 nm) are examined in aluminum-doped zinc oxide (AZO). Two AZO layers are grown at each thickness, one with and one without a 20-nm-thick ZnON buffer layer. Plots of the 10 K sheet concentration n(s) versus d for buffered (B) and unbuffered (UB) samples give straight lines of similar slope, n = 8.36 x 10(20) and 8.32 x 10(20) cm(-3), but different x-axis intercepts, delta d = -4 and +13 nm, respectively. Plots of n(s) versus d at 294 K produce substantially the same results. Plots of mu versus d can be well fitted with the equation mu(d) = mu(infinity)/left perpendicular1 + d*/(d -delta d)right perpendicular, where d* is the thickness for which mu(infinity) is reduced by a factor 2. For the B and UB samples, d* = 7 and 23 nm, respectively, showing the efficacy of the ZnON buffer. Finally, from n and mu(infinity) we can use degenerate electron scattering theory to calculate bulk donor and acceptor concentrations of 1.23 x 10(21) cm(-3) and 1.95 x 10(20) cm(-3), respectively, and Drude theory to predict a plasmonic resonance at 1.34 mu m. The latter is confirmed by reflectance measurements. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. [DOI: 10.1117/1.OE.52.3.033801]
C1 [Look, David C.] Wright State Univ, Semicond Res Ctr, Dayton, OH 45435 USA.
[Look, David C.] Aerosp Div, Wyle Labs, Dayton, OH USA.
[Look, David C.; Leedy, Kevin D.; Kiefer, Arnold; Claflin, Bruce] USAF, Sensors Directorate, Res Lab, Dayton, OH USA.
[Itagaki, Naho; Matsushima, Koichi; Surhariadi, Iping] Kyushu Univ, Dept Informat Sci & Elect Engn, Fukuoka 812, Japan.
RP Look, DC (reprint author), Wright State Univ, Semicond Res Ctr, Dayton, OH 45435 USA.
EM david.look@wright.edu
FU AFOSR [FA9550-10-1-0079]; NSF [DMR0803276]; DOE [DE-FG02-11ER46820];
AFRL [HC1047-05-D-4005]
FX We wish to thank T. A. Cooper for the Hall-effect measurements and W.
Rice for the reflectance measurements. Support for DCL was provided by
AFOSR Grant FA9550-10-1-0079 (J. Hwang), NSF Grant DMR0803276 (C. Ying),
DOE Grant DE-FG02-11ER46820 (R. Kortan), and AFRL Contract
HC1047-05-D-4005 (D. Tomich).
NR 20
TC 26
Z9 26
U1 2
U2 41
PU SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA
SN 0091-3286
J9 OPT ENG
JI Opt. Eng.
PD MAR
PY 2013
VL 52
IS 3
AR 033801
DI 10.1117/1.OE.52.3.033801
PG 5
WC Optics
SC Optics
GA 134XB
UT WOS:000318248000015
ER
PT J
AU Garza, R
Hill, RR
Mattioda, DD
AF Garza, Ricardo
Hill, Raymond R.
Mattioda, Daniel D.
TI Using simulation to analyze the maintenance architecture for a USAF
weapon system
SO SIMULATION-TRANSACTIONS OF THE SOCIETY FOR MODELING AND SIMULATION
INTERNATIONAL
LA English
DT Article
DE discrete-event simulation; weapon systems analysis; maintenance
processes; simulation-based experimental design
AB The United States Air Force (USAF) is investigating the use of three levels of repair with its aircraft maintenance managerial structure. This study provides an initial look at the effect of maintenance resource collaboration among maintenance locations and the use of a centralized repair facility focusing on a critical line replacement unit for a major USAF weapon system. Maintenance data for prior year maintenance experiences are collected, fit into appropriate probability distributions and implemented in a discrete event simulation model. This model is then used within an experimental design framework to examine the potential impact of organizational changes to the USAF hierarchical maintenance structure.
C1 [Garza, Ricardo] Logist Management Agcy, Montgomery, AL USA.
[Hill, Raymond R.; Mattioda, Daniel D.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Hill, RR (reprint author), USAF, Inst Technol, 2950 Hobson Way,Bldg 641,Suite 201 WPAFB, Wright Patterson AFB, OH 45433 USA.
EM ricardo.garza@us.af.mil; raymond.hill@afit.edu; daniel.mattioda@afit.edu
NR 26
TC 0
Z9 0
U1 1
U2 5
PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 0037-5497
J9 SIMUL-T SOC MOD SIM
JI Simul.-Trans. Soc. Model. Simul. Int.
PD MAR
PY 2013
VL 89
IS 3
SI SI
BP 294
EP 305
DI 10.1177/0037549712461382
PG 12
WC Computer Science, Interdisciplinary Applications; Computer Science,
Software Engineering
SC Computer Science
GA 135HX
UT WOS:000318280300005
ER
PT J
AU Rathje, JM
Spence, LB
Cummings, ML
AF Rathje, Jason M.
Spence, Lee B.
Cummings, Mary L.
TI Human-Automation Collaboration in Occluded Trajectory Smoothing
SO IEEE TRANSACTIONS ON HUMAN-MACHINE SYSTEMS
LA English
DT Article
DE Ballistic missile defense system (BMDS); human-automation collaboration;
occluded trajectories; track association
ID INTERPOLATION; CONSISTENCY; PERFORMANCE
AB Deciding if and what objects should be engaged in a ballistic missile defense system (BMDS) scenario involves a number of complex issues. The system is large, and the timelines may be on the order of a few minutes, which drives designers to automate these systems. The critical nature of ballistic missile defense engagement decisions however, suggests exploring a human-in-the-loop approach to allow for judgment, knowledge-based decisions, and the ability to override automation decisions. This BMDS problem is reflective of the function allocation conundrum faced in many supervisory control systems, which is how to determine which functions should be mutually exclusive and which should be collaborative between humans and automation. This paper motivates and outlines two experiments that quantitatively investigated human/automation tradeoffs in the specific domain of tracking problems. Participants in both experiments were tested in their ability to smooth trajectories in different scenarios. In the first experiment, they clearly demonstrated an ability to assist an algorithm in more difficult, shorter timeline scenarios. The second experiment combined the strengths of both human and automation in order to produce a collaborative effort. Comparison of the collaborative effort to the algorithm showed that adjusting the criterion for having human participation could significantly improve solutions. Future work should focus on further examination of appropriate criteria.
C1 [Rathje, Jason M.] USAF, Eglin AFB, FL 32542 USA.
[Spence, Lee B.] MIT, Lincoln Lab, Lexington, MA 02420 USA.
[Cummings, Mary L.] MIT, Dept Aeronaut & Astronaut, Cambridge, MA 02139 USA.
[Cummings, Mary L.] MIT, Engn Syst Div, Cambridge, MA 02139 USA.
RP Rathje, JM (reprint author), USAF, Eglin AFB, FL 32542 USA.
EM jrathje@mit.edu; spence@ll.mit.edu; missyc@mit.edu
FU MIT Lincoln Laboratory
FX Manuscript received November 29, 2010; revised September 17, 2011 and
July 16, 2012; accepted October 13, 2012. Date of current version
February 12, 2013. This work was supported in part by MIT Lincoln
Laboratory. This paper was recommended by Associate Editor M. Dorneich
of the former IEEE Transactions on Systems, Man and Cybernetics, Part A:
Systems and Humans (2011 Impact Factor: 2.123).
NR 19
TC 1
Z9 1
U1 0
U2 5
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 2168-2291
J9 IEEE T HUM-MACH SYST
JI IEEE T. Hum.-Mach. Syst.
PD MAR
PY 2013
VL 43
IS 2
BP 137
EP 148
DI 10.1109/TSMCA.2012.2230439
PG 12
WC Computer Science, Artificial Intelligence; Computer Science, Cybernetics
SC Computer Science
GA 126TY
UT WOS:000317645300001
ER
PT J
AU Quarrie, LO
AF Quarrie, Lindsay O'Brien
TI The effects of atomic rubidium vapor on the performance of optical
windows in Diode Pumped Alkali Lasers (DPALs)
SO OPTICAL MATERIALS
LA English
DT Article
DE Optical materials; Optical transmission; Alkali laser; Thin film; Alkali
resistant; DPAL
AB Diode Pumped Alkali Lasers (DPALs) suffers from damage to its optical windows due to atomic alkali exposure. DPALs are of great interest since they can combine multiple lasers to achieve higher laser output power, scalable to megawatts, with very high quantum efficiency. However before scaling to higher laser output beam power, damage to the optical windows from atomic alkali exposure in the gain medium has to be addressed. A DPAL emulator chamber was constructed for the purpose of evaluating different optical windows in a representative hot alkali rich environment typical of a DPAL gain cell. Sample optical windows of fused silica, alumina, magnesium fluoride and calcium fluoride were exposed in the DPAL emulator in order to qualitatively and quantitatively demonstrate and assess the damaging effects of the atomic rubidium vapor on the optical windows. Methodologies to examine the damage were developed for comparing exposed and unexposed optical windows. We found that damage to the optical windows due to the atomic rubidium can be quantified by means of changes in laser energy transmission through the optical window after rubidium exposure. (c) 2012 Elsevier B.V. All rights reserved.
C1 [Quarrie, Lindsay O'Brien] New Mexico Inst Min & Technol, Dept Mat Engn, Socorro, NM 87801 USA.
[Quarrie, Lindsay O'Brien] USAF, Res Lab, AFRL RDLC Laser CoE, Kirtland AFB, NM 87117 USA.
RP Quarrie, LO (reprint author), New Mexico Inst Min & Technol, Dept Mat Engn, 801 LeRoy Pl, Socorro, NM 87801 USA.
EM lindsay.quarrie@l-3com.com
NR 24
TC 9
Z9 9
U1 1
U2 16
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0925-3467
J9 OPT MATER
JI Opt. Mater.
PD MAR
PY 2013
VL 35
IS 5
BP 843
EP 851
DI 10.1016/j.optmat.2012.10.040
PG 9
WC Materials Science, Multidisciplinary; Optics
SC Materials Science; Optics
GA 128WQ
UT WOS:000317800800005
ER
PT J
AU Emmons, D
Acebal, A
Pulkkinen, A
Taktakishvili, A
MacNeice, P
Odstrcil, D
AF Emmons, D.
Acebal, A.
Pulkkinen, A.
Taktakishvili, A.
MacNeice, P.
Odstrcil, D.
TI Ensemble forecasting of coronal mass ejections using the WSA-ENLIL with
CONED Model
SO SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS
LA English
DT Article
ID DISTURBANCES; SIMULATION; CMES
AB The combination of the Wang-Sheeley-Arge (WSA) coronal model, ENLIL heliospherical model version 2.7, and CONED Model version 1.3 (WSA-ENLIL with CONED Model) was employed to form ensemble forecasts for 15 halo coronal mass ejections (halo CMEs). The input parameter distributions were formed from 100 sets of CME cone parameters derived from the CONED Model. The CONED Model used image processing along with the bootstrap approach to automatically calculate cone parameter distributions from SOHO/LASCO imagery based on techniques described by Pulkkinen et al. (2010). The input parameter distributions were used as input to WSA-ENLIL to calculate the temporal evolution of the CMEs, which were analyzed to determine the propagation times to the L-1 Lagrangian point and the maximum K-p indices due to the impact of the CMEs on the Earth's magnetosphere. The Newell et al. (2007) K-p index formula was employed to calculate the maximum K-p indices based on the predicted solar wind parameters near Earth assuming two magnetic field orientations: a completely southward magnetic field and a uniformly distributed clock-angle in the Newell et al. (2007) K-p index formula. The forecasts for 5 of the 15 events had accuracy such that the actual propagation time was within the ensemble average plus or minus one standard deviation. Using the completely southward magnetic field assumption, 10 of the 15 events contained the actual maximum K-p index within the range of the ensemble forecast, compared to 9 of the 15 events when using a uniformly distributed clock angle. Citation: Emmons, D., A. Acebal, A. Pulkkinen, A. Taktakishvili, P. MacNeice, and D. Odstrcil (2013), Ensemble forecasting of coronal mass ejections using the WSA-ENLIL with CONED Model, Space Weather, 11, 95-106, doi: 10.1002/swe.20019.
C1 [Emmons, D.; Acebal, A.] USAF, Dept Engn Phys, Inst Technol, Dayton, OH USA.
[Emmons, D.] USAF, Res Lab, Space Vehicles Directorate, Albuquerque, NM 87116 USA.
[Pulkkinen, A.; Taktakishvili, A.; MacNeice, P.; Odstrcil, D.] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
[Pulkkinen, A.] Catholic Univ Amer, Washington, DC 20064 USA.
[Odstrcil, D.] George Mason Univ, Fairfax, VA 22030 USA.
RP Emmons, D (reprint author), USAF, Res Lab, Space Vehicles Directorate, Albuquerque, NM 87116 USA.
EM emmons29@yahoo.com
FU Air Force Institute of Technology; Community Coordinated Modeling Center
FX This analysis was sponsored by the Air Force Institute of Technology and
the Community Coordinated Modeling Center. D. Emmons was sponsored by
the Air Force Institute of Technology. The authors would like to thank
NOAA/SWPC's warehouse, NASA's OMNIWeb and CDAW data centers, and the
CELIAS/MTOF Proton Monitor (http://umtof.umd.edu/pm/) for the use of
their data. The views expressed in this article are those of the authors
and do not necessarily reflect the official policy or position of the
Air Force, the Department of Defense, or the U. S. government.
NR 23
TC 8
Z9 8
U1 1
U2 5
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 1542-7390
J9 SPACE WEATHER
JI Space Weather
PD MAR
PY 2013
VL 11
IS 3
BP 95
EP 106
DI 10.1002/swe.20019
PG 12
WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology &
Atmospheric Sciences
SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology &
Atmospheric Sciences
GA 129JC
UT WOS:000317834300003
ER
PT J
AU Shen, H
Tan, Y
Lu, J
Wu, Q
Qiu, QR
AF Shen, Hao
Tan, Ying
Lu, Jun
Wu, Qing
Qiu, Qinru
TI Achieving Autonomous Power Management Using Reinforcement Learning
SO ACM TRANSACTIONS ON DESIGN AUTOMATION OF ELECTRONIC SYSTEMS
LA English
DT Article
DE Design; Experimentation; Management; Performance; Power management;
thermal management; machine learning; computer
ID MULTIPROCESSOR SOCS; THERMAL MANAGEMENT; SYSTEMS; PREDICTION; MEMORY
AB System level power management must consider the uncertainty and variability that come from the environment, the application and the hardware. A robust power management technique must be able to learn the optimal decision from past events and improve itself as the environment changes. This article presents a novel on-line power management technique based on model-free constrained reinforcement learning (Q-learning). The proposed learning algorithm requires no prior information of the workload and dynamically adapts to the environment to achieve autonomous power management. We focus on the power management of the peripheral device and the microprocessor, two of the basic components of a computer. Due to their different operating behaviors and performance considerations, these two types of devices require different designs of Q-learning agent. The article discusses system modeling and cost function construction for both types of Q-learning agent. Enhancement techniques are also proposed to speed up the convergence and better maintain the required performance (or power) constraint in a dynamic system with large variations. Compared with the existing machine learning based power management techniques, the Q-learning based power management is more flexible in adapting to different workload and hardware and provides a wider range of power-performance tradeoff.
C1 [Shen, Hao; Qiu, Qinru] Syracuse Univ, Syracuse, NY 13244 USA.
[Tan, Ying; Lu, Jun] SUNY Binghamton, Binghamton, NY 13902 USA.
[Wu, Qing] USAF, Res Lab, Arlington, VA USA.
RP Shen, H (reprint author), Syracuse Univ, Syracuse, NY 13244 USA.
EM shenao.ee.seu@gmail.com
FU NSF [CNS-0845947]
FX This work is supported in part by NSF under grant CNS-0845947.
NR 45
TC 5
Z9 5
U1 0
U2 4
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA
SN 1084-4309
EI 1557-7309
J9 ACM T DES AUTOMAT EL
JI ACM Transact. Des. Automat. Electron. Syst.
PD MAR
PY 2013
VL 18
IS 2
AR 24
DI 10.1145/2442087.2442095
PG 32
WC Computer Science, Hardware & Architecture; Computer Science, Software
Engineering
SC Computer Science
GA 123YD
UT WOS:000317427700008
ER
PT J
AU Jirasek, A
Jeans, TL
Martenson, M
Cummings, RM
Bergeron, K
AF Jirasek, Adam
Jeans, Tiger L.
Martenson, Matthew
Cummings, Russell M.
Bergeron, Keith
TI Improved methodologies for the design of maneuver for stability and
control simulations
SO AEROSPACE SCIENCE AND TECHNOLOGY
LA English
DT Article
DE System identification; Reduced order modeling; Non-linear aerodynamics
ID DETACHED-EDDY SIMULATION; IDENTIFICATION; SIGNALS
AB With many modern fighter aircraft experiencing unpredicted flight dynamics during flight tests, recent research has focused on developing methodologies for incorporating computational fluid dynamics into the aircraft development process. The goal of this approach is to identify configurations susceptible to stability and control issues early in the design process. Previous research has primarily focused on full aircraft configurations, however, to increase the rate of development the current study focused on a two-dimensional NACA0012 airfoil. The two-dimensional NACA0012 airfoil has the advantage of reducing the computational cost by orders of magnitude compared to full scale aircraft simulations, while still providing complicated aerodynamics at high angles of attack. Computationally predicted lift coefficients from a number of newly developed training maneuvers were used to generate reduced order aerodynamic loads models. For evaluation, these models were compared to generated static and dynamic validation data. Methods of improving both the computational training maneuver and the reduced order modeling approach are suggested. Published by Elsevier Masson SAS.
C1 [Jirasek, Adam; Jeans, Tiger L.; Martenson, Matthew; Cummings, Russell M.; Bergeron, Keith] USAF Acad, Colorado Springs, CO 80840 USA.
RP Jirasek, A (reprint author), CNR, Dept Aeronaut, Washington, DC 20001 USA.
EM adam.jirasek@gmail.com
FU Air Force Office of Scientific Research, AFOSR; United States Air Force
Academy, USAFA; Modeling and Simulation Research Center; National
Research Council (NRC); United States Air Force SEEK Eagle Office
FX The authors would like to thank the Air Force Office of Scientific
Research, AFOSR, the United States Air Force Academy, USAFA - Modeling
and Simulation Research Center, the National Research Council (NRC) and
the United States Air Force SEEK Eagle Office for their generous
financial support throughout this project. The Arctic Region
Supercomputing Center is acknowledged for providing access to high
performance computing facilities.
NR 47
TC 0
Z9 0
U1 1
U2 3
PU ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
PI PARIS
PA 23 RUE LINOIS, 75724 PARIS, FRANCE
SN 1270-9638
J9 AEROSP SCI TECHNOL
JI Aerosp. Sci. Technol.
PD MAR
PY 2013
VL 25
IS 1
BP 203
EP 223
DI 10.1016/j.ast.2012.01.008
PG 21
WC Engineering, Aerospace
SC Engineering
GA 124CY
UT WOS:000317442600021
ER
PT J
AU Jelic, R
Sherer, S
Greendyke, R
AF Jelic, Renato
Sherer, Scott
Greendyke, Robert
TI Simulation of Various Turrets at Subsonic and Transonic Flight
Conditions Using OVERFLOW
SO JOURNAL OF AIRCRAFT
LA English
DT Article; Proceedings Paper
CT 50th AIAA Aerospace Sciences Meeting and Exhibit including the New
Horizons Forum and Aerospace Exposition
CY JAN 09-12, 2012
CL Nashville, TN
SP AIAA, US AF Off Sci Res
ID HORSESHOE VORTEX; CYLINDER
AB In this work, the flowfields associated with two canonical turret geometries, a fully exposed hemisphere on a flat plate and a 50% submerged hemisphere on a flat plate, were simulated using the OVERFLOW 2 flow solver. Both turret geometries use a flat-window aperture with an aperture ratio (ratio of the aperture diameter to the turret diameter) of 0.295 and an elevation angle of 57 deg. The forward field of regard was the particular focus in this study, and both symmetric (azimuth angle of 0 deg) and asymmetric (azimuth of 45 deg) window orientations were examined. Two flight conditions were also studied: a subsonic case with M = 0.45 and Re-D = 6.30 x 10(6) and a transonic case with M = 0.85 and Re-D = 9.53 x 10(6). The flowfield was simulated using the delayed detached-eddy simulation capability of OVERFLOW in conjunction with the spatially fifth-order weighted essentially nonoscillatory scheme to capture the off-body vortical structures. The impact of the turret aerodynamics on the performance of the turrets for directed energy applications is inferred through consideration of the flow features, density and pressure fluctuations, and forces on the turrets.
C1 [Jelic, Renato] USAF, Natl Air & Space Intelligence Ctr, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Sherer, Scott] USAF, Design & Anal Branch, Aerosp Syst Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Greendyke, Robert] USAF, Dept Aeronaut & Astronaut, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Jelic, R (reprint author), USAF, Natl Air & Space Intelligence Ctr, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 25
TC 1
Z9 1
U1 2
U2 3
PU AMER INST AERONAUTICS ASTRONAUTICS
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0021-8669
J9 J AIRCRAFT
JI J. Aircr.
PD MAR-APR
PY 2013
VL 50
IS 2
BP 398
EP 409
DI 10.2514/1.C031844
PG 12
WC Engineering, Aerospace
SC Engineering
GA 122MJ
UT WOS:000317321900008
ER
PT J
AU Ricciardi, AP
Patil, MJ
Canfield, RA
Lindsley, N
AF Ricciardi, Anthony P.
Patil, Mayuresh J.
Canfield, Robert A.
Lindsley, Ned
TI Evaluation of Quasi-Static Gust Loads Certification Methods for
High-Altitude Long-Endurance Aircraft
SO JOURNAL OF AIRCRAFT
LA English
DT Article
ID TWISTED ANISOTROPIC BEAMS; FLEXIBLE FLYING WINGS; FLIGHT DYNAMICS;
CONFIGURATION; DESIGN
AB Aeroelastic gust loads analysis can be approached using quasi-static, transient, or continuous methodologies. Pratt method is a quasi-static approach that forms the basis for Federal Aviation Regulation Part 23 gust loads certification requirements. This work evaluates the usefulness of Pratt method for unconventional high-altitude long-endurance aircraft. The derivation of Pratt method is reviewed, and all assumptions are identified. Error of a key curve fit equation is quantified directly. A state-of-the-art nonlinear aeroelastic code was upgraded and used to facilitate quantification of application-dependent errors by comparing quasi-static results to results from nonlinear transient analysis. Application-dependent errors are presented in the context of a SensorCraft-inspired joined-wing model and a Helios-aircraft-inspired flying-wing model. Recommendations are made on the usability of Pratt method for aircraft similar to the two high-altitude long-endurance models. It is concluded that Pratt method is useful for preliminary design of the joined-wing model but inadequate for the analysis of the flying-wing model. Further recommendations are made regarding the subtleties in the implementation of Pratt method for unconventional configurations.
C1 [Ricciardi, Anthony P.; Patil, Mayuresh J.; Canfield, Robert A.] Virginia Polytech Inst & State Univ, Dept Aerosp & Ocean Engn, Blacksburg, VA 24061 USA.
[Lindsley, Ned] USAF, Res Lab, AFRL MSTC, Wright Patterson AFB, OH 45433 USA.
RP Ricciardi, AP (reprint author), Virginia Polytech Inst & State Univ, Dept Aerosp & Ocean Engn, Blacksburg, VA 24061 USA.
EM pasquale@vt.edu; mpatil@vt.edu; bob.cantield@vt.edu;
ned.lindsley@wpafb.af.mil
RI Patil, Mayuresh/E-4644-2013; Canfield, Robert/C-1798-2012
OI Patil, Mayuresh/0000-0001-9601-2249; Canfield,
Robert/0000-0003-3679-2815
FU U.S. Air Force Research Laboratory [FA8650-09-2-3938]
FX This material is based on research sponsored by U.S. Air Force Research
Laboratory under agreement number FA8650-09-2-3938. The views and
conclusions contained herein are those of the authors and should not be
interpreted as necessarily representing the official policies or
endorsements, either expressed or implied, of the U.S. Air Force
Research Laboratory or the U.S. Government.
NR 34
TC 1
Z9 2
U1 0
U2 13
PU AMER INST AERONAUTICS ASTRONAUTICS
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0021-8669
J9 J AIRCRAFT
JI J. Aircr.
PD MAR-APR
PY 2013
VL 50
IS 2
BP 457
EP 468
DI 10.2514/1.C031872
PG 12
WC Engineering, Aerospace
SC Engineering
GA 122MJ
UT WOS:000317321900013
ER
PT J
AU Atkinson, M
Poggie, J
Camberos, J
AF Atkinson, Michael
Poggie, Jonathan
Camberos, Jose
TI Control of High-Angle-of-Attack Reentry Flow with Plasma Actuators
SO JOURNAL OF SPACECRAFT AND ROCKETS
LA English
DT Article
ID NAVIER-STOKES EQUATIONS; SUPERSONIC-FLOW; AERODYNAMIC CONTROL; LINE
RELAXATION; DRAG REDUCTION; BLUNT-BODY; DISCHARGES; CONE
AB A numerical investigation was conducted to explore the potential of magnetically accelerated surface discharges to control the flow over reentry vehicles at high angle of attack. The baseline geometry and test conditions were selected based on experiments: a 2 : 1 blunt-nosed elliptic cone with a half-angle along the major axis of 10 deg, a Mach number of 14.5, a Reynolds number based on a length of 36,000, and an angle of attack of 60 deg. A phenomenological model was developed, based on experiments and computations, to simulate the effects of magnetically accelerated surface discharges on the elliptic cone flow. Control was applied near the leeward-side crossflow separation line, and several actuator configurations were considered, include symmetric and asymmetric patterns and inboard and outboard forces. There were substantial changes in the leeward-side flow structure with actuation. Moments generated about the pitch, yaw, and roll axes were quantified, along with the corresponding heat transfer penalty and actuator power consumption.
C1 [Poggie, Jonathan] USAF, Res Lab, Computat Sci Ctr, High Speed Flow Res Team, Wright Patterson AFB, OH 45433 USA.
[Camberos, Jose] USAF, Res Lab, Multidisciplinary Sci & Technol Ctr, Wright Patterson AFB, OH 45433 USA.
FU Air Force Fully Reusable Access to Space Technology Program; Air Force
Office of Scientific Research
FX Partial sponsorship for M. Atkinson was provided by the Air Force Fully
Reusable Access to Space Technology Program. High-performance computer
time was provided by the Air Force Research Laboratory Department of
Defense Supercomputing Resource Center. Additional support was provided
by the Air Force Office of Scientific Research, under a grant monitored
by F. Fahroo, Air Force Office of Scientific Research. The authors are
indebted to G. Candler for permission to use his flow solver, and to R.
Gosse and I. Nompelis for lending their assistance and expertise. N.
Bisek, D. Gaitonde, J. Jaworski, and M. White provided many helpful
discussions.
NR 50
TC 1
Z9 1
U1 2
U2 14
PU AMER INST AERONAUTICS ASTRONAUTICS
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0022-4650
J9 J SPACECRAFT ROCKETS
JI J. Spacecr. Rockets
PD MAR-APR
PY 2013
VL 50
IS 2
BP 337
EP 346
DI 10.2514/1.A32360
PG 10
WC Engineering, Aerospace
SC Engineering
GA 121PY
UT WOS:000317257900009
ER
PT J
AU Molek, CD
Lindsay, CM
Fajardo, ME
AF Molek, Christopher D.
Lindsay, C. Michael
Fajardo, Mario E.
TI A combined matrix isolation spectroscopy and cryosolid positron
moderation apparatus
SO REVIEW OF SCIENTIFIC INSTRUMENTS
LA English
DT Article
ID RARE-GAS SOLIDS; INFRARED INTENSITIES; PARAHYDROGEN SOLIDS; SLOW
POSITRONS; NEON MODERATOR; KR MODERATOR; WATER DIMER; BEAM; ABSORPTION;
ARGON
AB We describe the design, construction, and operation of a novel apparatus for investigating efficiency improvements in thin-film cryogenic solid positron moderators. We report results from solid neon, argon, krypton, and xenon positron moderators which illustrate the capabilities and limitations of our apparatus. We integrate a matrix isolation spectroscopy diagnostic within a reflection-geometry positron moderation system. We report the optical thickness, impurity content, and impurity trapping site structures within our moderators determined from infrared absorption spectra. We use a retarding potential analyzer to modulate the flow of slow positrons, and report positron currents vs. retarding potential for the different moderators. We identify vacuum ultraviolet emissions from irradiated Ne moderators as the source of spurious signals in our channel electron multiplier slow positron detection channel. Our design is also unusual in that it employs a sealed radioactive Na-22 positron source which can be translated relative to, and isolated from, the cryogenic moderator deposition substrate. This allows us to separate the influences on moderator efficiency of surface contamination by residual gases from those of accumulated radiation damage. [http://dx.doi.org/10.1063/1.4795555]
C1 [Molek, Christopher D.; Lindsay, C. Michael; Fajardo, Mario E.] USAF, Res Lab, Munit Directorate, Ordnance Div,Energet Mat Branch,AFRL RWME, Eglin AFB, FL 32542 USA.
RP Fajardo, ME (reprint author), USAF, Res Lab, Munit Directorate, Ordnance Div,Energet Mat Branch,AFRL RWME, 2306 Perimeter Rd, Eglin AFB, FL 32542 USA.
EM mario.fajardo@eglin.af.mil
FU National Research Council Research Associateship Awards
FX We gratefully acknowledge the technical inspiration and hands-on
assistance of Mr. Kenneth M. Edwards at the inception of this project.
C. D. M. and C. M. L. acknowledge the National Research Council Research
Associateship Awards which supported their research on this project.
NR 61
TC 2
Z9 2
U1 2
U2 18
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0034-6748
J9 REV SCI INSTRUM
JI Rev. Sci. Instrum.
PD MAR
PY 2013
VL 84
IS 3
AR 035106
DI 10.1063/1.4795555
PG 11
WC Instruments & Instrumentation; Physics, Applied
SC Instruments & Instrumentation; Physics
GA 117PS
UT WOS:000316966200051
PM 23556851
ER
PT J
AU Oswald, BB
Schuren, JC
Pagan, DC
Miller, MP
AF Oswald, Benjamin B.
Schuren, Jay C.
Pagan, Darren C.
Miller, Matthew P.
TI An experimental system for high temperature X-ray diffraction studies
with in situ mechanical loading
SO REVIEW OF SCIENTIFIC INSTRUMENTS
LA English
DT Article
ID STRESS
AB An experimental system with in situ thermomechanical loading has been developed to enable high energy synchrotron x-ray diffraction studies of crystalline materials. The system applies and maintains loads of up to 2250 N in uniaxial tension or compression at a frequency of up to 100 Hz. The furnace heats the specimen uniformly up to a maximum temperature of 1200 degrees C in a variety of atmospheres (oxidizing, inert, reducing) that, combined with in situ mechanical loading, can be used to mimic processing and operating conditions of engineering components. The loaded specimen is reoriented with respect to the incident beam of x-rays using two rotational axes to increase the number of crystal orientations interrogated. The system was used at the Cornell High Energy Synchrotron Source to conduct experiments on single crystal silicon and polycrystalline Low Solvus High Refractory nickel-based superalloy. The data from these experiments provide new insights into how stresses evolve at the crystal scale during thermomechanical loading and complement the development of high-fidelity material models. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793230]
C1 [Oswald, Benjamin B.; Pagan, Darren C.; Miller, Matthew P.] Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14853 USA.
[Schuren, Jay C.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Oswald, BB (reprint author), Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14853 USA.
EM mpm4@cornell.edu
FU National Science Foundation (NSF) [CMMI-0928257]; National Science
Foundation; National Institutes of Health/National Institute of General
Medical Sciences under NSF [DMR-0936384]
FX The development of the experimental system presented in this paper was
supported financially by the National Science Foundation (NSF) under
Award No. CMMI-0928257, Dr. Glaucio Paulino program manager. The Low
Solvus High Refractory nickel-based superalloy material was supplied by
the Materials and Manufacturing Directorate of the Air Force Research
Laboratory. Experiments using the system were conducted at the Cornell
High Energy Synchrotron Source (CHESS) which is supported by the
National Science Foundation and the National Institutes of
Health/National Institute of General Medical Sciences under NSF Award
No. DMR-0936384. Dr. Alexander Kazimirov is gratefully acknowledged for
his support of our research program during his time as the CHESS A2
Beamline Scientist. The authors wish to thank Basil Blank and Dr.
Jun-Sang Park for their contributions during the assembly and
implementation phases of the project. The authors would also like to
acknowledge Professor Matthew Kramer, Iowa State University and
Professor Francis DiSalvo, Cornell University for their insight on the
design of the furnace.
NR 17
TC 4
Z9 4
U1 1
U2 17
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0034-6748
J9 REV SCI INSTRUM
JI Rev. Sci. Instrum.
PD MAR
PY 2013
VL 84
IS 3
AR 033902
DI 10.1063/1.4793230
PG 12
WC Instruments & Instrumentation; Physics, Applied
SC Instruments & Instrumentation; Physics
GA 117PS
UT WOS:000316966200025
PM 23556825
ER
PT J
AU Sonmez, T
Switzer, TB
AF Soenmez, Tayfun
Switzer, Tobias B.
TI Matching With (Branch-of-Choice) Contracts at the United States Military
Academy
SO ECONOMETRICA
LA English
DT Article
DE Market design; matching with contracts; stability; strategy-proofness
ID KIDNEY EXCHANGE; SCHOOL CHOICE; STABLE MATCHINGS; STABILITY;
SUBSTITUTES; ALLOCATION; MECHANISMS; NETWORKS; SALARIES
AB Branch selection is a key decision in a cadet's military career. Cadets at USMA can increase their branch priorities at a fraction of slots by extending their service agreement. This real-life matching problem fills an important gap in the market design literature, providing strong empirical legitimacy to a series of elegant theoretical works on matching with contracts. Although priorities fail a key substitutes condition, the agent-optimal stable mechanism is well defined, and in contrast to the current USMA mechanism it is fair, stable, strategy-proof, and respects improvements in cadet priorities. Adoption of this mechanism benefits cadets and the Army. This new application shows that the matching with contracts model is practically relevant beyond traditional domains that satisfy the substitutes condition.
C1 [Soenmez, Tayfun] Boston Coll, Dept Econ, Chestnut Hill, MA 02467 USA.
[Switzer, Tobias B.] USAF, Hurlburt Field, FL 32544 USA.
RP Sonmez, T (reprint author), Boston Coll, Dept Econ, Chestnut Hill, MA 02467 USA.
EM sonmezt@bc.edu; tobias.switzer@gmail.com
NR 47
TC 20
Z9 21
U1 0
U2 17
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0012-9682
J9 ECONOMETRICA
JI Econometrica
PD MAR
PY 2013
VL 81
IS 2
BP 451
EP 488
DI 10.3982/ECTA10570
PG 38
WC Economics; Mathematics, Interdisciplinary Applications; Social Sciences,
Mathematical Methods; Statistics & Probability
SC Business & Economics; Mathematics; Mathematical Methods In Social
Sciences
GA 112YO
UT WOS:000316631600001
ER
PT J
AU Doudican, BM
Zand, B
Amaya, P
Butalia, TS
Wolfe, WE
Schoeppner, GA
AF Doudican, Bradley M.
Zand, Behrad
Amaya, Peter
Butalia, Tarunjit S.
Wolfe, William E.
Schoeppner, Gregory A.
TI Strain energy based failure criterion: Comparison of numerical
predictions and experimental observations for symmetric composite
laminates subjected to triaxial loading
SO JOURNAL OF COMPOSITE MATERIALS
LA English
DT Article
DE Strain energy criterion; 3D stresses; through-thickness; failure
envelope
ID SUPERPOSED HYDROSTATIC-PRESSURE; GRAPHITE EPOXY COMPOSITES;
UNIDIRECTIONAL COMPOSITES; COMPRESSIVE FAILURE; NONLINEAR-ANALYSIS;
EXERCISE; BEHAVIOR; GLASS; STRENGTH; KINKING
AB An analytical model to predict the constitutive response, failure initiation and post-initial failure behavior of fibrous composites under triaxial loading has been developed based on a strain energy formulation. This paper highlights the means of developing several key parameters in the model and extends the model to include the effects of in-plane thermal residual stresses accumulated during the curing of composite laminates. The derivations of a set of consistent model input parameters for several composite material systems are described. A series of comparative stress-strain curves and failure envelopes are provided comparing model predictions to published experimental data. The strain energy based failure model is found to provide good agreement with the experimental observations studied in this work.
C1 [Doudican, Bradley M.; Amaya, Peter; Butalia, Tarunjit S.; Wolfe, William E.] Ohio State Univ, Dept Civil Environm & Geodet Engn, Columbus, OH 43210 USA.
[Zand, Behrad] Amer Elect Power Co, Columbus, OH USA.
[Schoeppner, Gregory A.] AFRL, Mat & Mfg Directorate, Afb, OH USA.
RP Butalia, TS (reprint author), Ohio State Univ, Dept Civil Environm & Geodet Engn, Columbus, OH 43210 USA.
EM butalia.1@osu.edu
NR 29
TC 3
Z9 3
U1 1
U2 13
PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 0021-9983
J9 J COMPOS MATER
JI J. Compos Mater.
PD MAR
PY 2013
VL 47
IS 6-7
SI SI
BP 847
EP 866
DI 10.1177/0021998312462617
PG 20
WC Materials Science, Composites
SC Materials Science
GA 116XN
UT WOS:000316916700013
ER
PT J
AU Le, AQ
Sun, LZ
Miller, TC
AF Le, Anhduong Q.
Sun, L. Z.
Miller, Timothy C.
TI Detectability of Delaminations in Solid Rocket Motors with Embedded
Stress Sensors
SO JOURNAL OF PROPULSION AND POWER
LA English
DT Article
AB A finite element model is used to investigate the effect of delaminations on the radial stress distribution along the bondline during the cooling process of a solid rocket motor composed of propellant, insulation, and casing. Under the assumption of stress sensors evenly distributed along the circumference of the interface between the propellant and insulation, a relationship is established between the debond angle, the number of sensors, and the required sensor accuracy. Two approaches are proposed to detect debonds based on the radial stress readings from these embedded sensors. In addition, a quantitative mapping is obtained between the debond size and the sensor data to inversely estimate the extent of the delamination. It is demonstrated that the proposed framework can detect delaminations in solid rocket motors.
C1 [Le, Anhduong Q.; Sun, L. Z.] Univ Calif Irvine, Dept Civil & Environm Engn, Irvine, CA 92697 USA.
[Miller, Timothy C.] USAF, Res Lab, Edwards AFB, CA 93524 USA.
RP Le, AQ (reprint author), Univ Calif Irvine, Dept Civil & Environm Engn, Irvine, CA 92697 USA.
RI Sun, Lizhi/C-5205-2008
FU U.S. Air Force Research Laboratory at Edwards Air Force Base (AFRL)
FX This work was made possible by the U.S. Air Force Research Laboratory at
Edwards Air Force Base (AFRL), which supported the Air Force Summer
Faculty Fellowship Program (SFFP) administered by the American Society
for Engineering Education (ASEE). The authors gratefully acknowledge
technical assistance from Jim Buswell and Herb Chelner of Micron
Instruments in regards to the DBST sensors, and Greg Yandek of
(AFRL/RZSM) for the data collection of EPDM insulation material.
NR 17
TC 4
Z9 4
U1 1
U2 23
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0748-4658
J9 J PROPUL POWER
JI J. Propul. Power
PD MAR-APR
PY 2013
VL 29
IS 2
BP 299
EP 304
DI 10.2514/1.B34523
PG 6
WC Engineering, Aerospace
SC Engineering
GA 110HM
UT WOS:000316433200002
ER
PT J
AU Deiner, LJ
Piotrowski, KA
Reitz, TL
AF Deiner, L. Jay
Piotrowski, Kelli A.
Reitz, Thomas L.
TI Mechanisms of Fatty Acid and Triglyceride Dispersant Bonding in
Non-Aqueous Dispersions of NiO
SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY
LA English
DT Article
ID FTIR SPECTRAL CHARACTERIZATION; THIN-FILM COATINGS; OXIDE FUEL-CELLS;
BATIO3 PARTICLES; NICKEL-HYDROXIDE; INFRARED-SPECTRA; ETHYL CELLULOSE;
OLEIC-ACID; ELECTROLYTE; ZIRCONIA
AB Infrared spectroscopy was used to identify the mechanism of fatty acid and triglyceride dispersant bonding to NiO in 2-butanol for a series of triglyceride and straight chain fatty acid dispersants with systematically varied chain lengths and degrees of unsaturation. The extent of NiO deflocculation was measured using laser diffraction particle size analysis. The relative stabilities of the fatty acid/NiO dispersions were assessed through settling tests. Diffuse reflectance infrared spectroscopy indicates that the straight chain fatty acids chemisorb to NiO as alkoxides with most of the adsorbed moieties in an 2 configuration. A small fraction of the adsorbed straight chain fatty acids are either chemisorbed through the hydroxyl oxygen in an 1 configuration or physisorbed as dimers. Glycerol trioleate and Menhaden fish oil both exhibit some chemisorption through the carbonyl oxygen. Despite similarities in adsorption mechanism, the dispersants differ in their abilities to break up NiO aggregates and to prevent re-aggregation. Dispersant characteristics favoring stability of the NiO/2-butanol dispersion are longer carbon chain length and higher degree of unsaturation. The triglyceride structure provides a weak improvement in stability. These results are discussed in the context of recent work developing non-aqueous inks for inkjet printing of solid oxide fuel cells.
C1 [Deiner, L. Jay; Piotrowski, Kelli A.] CUNY, New York City Coll Technol, Dept Chem, Brooklyn, NY 11201 USA.
[Reitz, Thomas L.] USAF, Res Labs, Wright Patterson AFB, OH 45433 USA.
RP Deiner, LJ (reprint author), CUNY, New York City Coll Technol, Dept Chem, Brooklyn, NY 11201 USA.
EM Ldeiner@citytech.cuny.edu
FU Air Force Research Labs under UES [S-932-19-MR002]; Air Force Summer
Faculty Fellowship program
FX The authors gratefully acknowledge financial support of this work by the
Air Force Research Labs under UES subcontract # S-932-19-MR002. L.J.D.
acknowledges the Air Force Summer Faculty Fellowship program for
support.
NR 49
TC 1
Z9 1
U1 2
U2 28
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0002-7820
J9 J AM CERAM SOC
JI J. Am. Ceram. Soc.
PD MAR
PY 2013
VL 96
IS 3
BP 750
EP 758
DI 10.1111/jace.12196
PG 9
WC Materials Science, Ceramics
SC Materials Science
GA 112DJ
UT WOS:000316572000013
ER
PT J
AU Parthasarathy, TA
Petry, MD
Cinibulk, MK
Mathur, T
Gruber, MR
AF Parthasarathy, Triplicane A.
Petry, Melvin D.
Cinibulk, Michael K.
Mathur, Tarun
Gruber, Mark R.
TI Thermal and Oxidation Response of UHTC Leading Edge Samples Exposed to
Simulated Hypersonic Flight Conditions
SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY
LA English
DT Article
ID HIGH-TEMPERATURE CERAMICS; DIBORIDE-SILICON-CARBIDE; DISSOCIATED AIR;
ZRB2; COMPOSITES; BEHAVIOR; HFB2
AB Sharp leading edge (LE) samples of UHTC (20vol%SiCHfB2) and SiC were exposed to simulated hypersonic flight conditions using a direct-connect scramjet rig and their thermal and oxidation responses measured. The measured back-wall temperatures and scale thicknesses were significantly smaller than might be expected from stagnation temperatures at the LE. Furthermore, the scale that formed around the LE was more uniform than expected from the steep drop in cold wall heat flux with distance from the tip. These results were interpreted and rationalized using physics-based models. An aerothermal model in combination with an oxidation model accounted for the observed scale thicknesses at the tip and their slight variation with distance. The scale thicknesses were similar to values reported for exposures in furnaces at temperatures calculated for the tip, but less than those reported in arc jet tests. The formation of hafnon (HfSiO4) and the absence of external glassy layer and of silica in the outer portions of the oxide region are unique to scramjet tested samples, presumably due to the high fluid flow (high shear and evaporation) rates.
C1 [Parthasarathy, Triplicane A.; Petry, Melvin D.; Cinibulk, Michael K.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Parthasarathy, Triplicane A.; Petry, Melvin D.] Universal Energy Syst Inc, Dayton, OH 45432 USA.
[Mathur, Tarun] ISSI, Dayton, OH USA.
[Gruber, Mark R.] USAF, Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
RP Parthasarathy, TA (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM Triplicane.Parthasar-athy@wpafb.af.mil
FU USAF [FA8650-10-D-5226]; US Air Force Office of Scientific Research
(AFOSR)
FX We acknowledge significant support from Charles Smith, Jerry Malott, Ken
Sack and Andrew Baron of ISSI, Dayton, OH and Steve Smith of AFRL/RQHF,
WPAFB, OH, all of whom operated the scramjet rig with dedication and
offered creative suggestions. This work was supported by USAF Contract #
FA8650-10-D-5226 which included funding from US Air Force Office of
Scientific Research (AFOSR), monitored by Dr. Ali Sayir.
NR 39
TC 17
Z9 18
U1 0
U2 38
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0002-7820
J9 J AM CERAM SOC
JI J. Am. Ceram. Soc.
PD MAR
PY 2013
VL 96
IS 3
BP 907
EP 915
DI 10.1111/jace.12180
PG 9
WC Materials Science, Ceramics
SC Materials Science
GA 112DJ
UT WOS:000316572000038
ER
PT J
AU Liu, L
Lo, CF
Xi, YY
Wang, YX
Ren, F
Pearton, SJ
Kim, HY
Kim, J
Fitch, RC
Walker, DE
Chabak, KD
Gillespie, JK
Tetlak, SE
Via, GD
Crespo, A
Kravchenko, II
AF Liu, Lu
Lo, Chien-Fong
Xi, Yuyin
Wang, Yuxi
Ren, Fan
Pearton, Stephen J.
Kim, Hong-Yeol
Kim, Jihyun
Fitch, Robert C.
Walker, Dennis E., Jr.
Chabak, Kelson D.
Gillespie, James K.
Tetlak, Stephen E.
Via, Glen D.
Crespo, Antonio
Kravchenko, Ivan I.
TI Dependence on proton energy of degradation of AlGaN/GaN high electron
mobility transistors
SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
LA English
DT Article
ID IRRADIATION; RADIATION; DEVICES
AB The effects of proton irradiation energy on dc, small signal, and large signal rf characteristics of AlGaN/GaN high electron mobility transistors (HEMTs) were investigated. AlGaN/GaN HEMTs were irradiated with protons at fixed fluence of 5 x 10(15)/cm(2) and energies of 5, 10, and 15 MeV. Both dc and rf characteristics revealed more degradation at lower irradiation energy, with reductions of maximum transconductance of 11%, 22%, and 38%, and decreases in drain saturation current of 10%, 24%, and 46% for HEMTs exposed to 15, 10, and 5 MeV protons, respectively. The increase in device degradation with decreasing proton energy is due to the increase in linear energy transfer and corresponding increase in nonionizing energy loss with decreasing proton energy in the active region of the HEMTs. After irradiation, both subthreshold drain leakage current and reverse gate current decreased more than 1 order of magnitude for all samples. The carrier removal rate was in the range 121-336 cm(-1) over the range of proton energies employed in this study. (C) 2013 American Vacuum Society. [http://dx.doi.org/10.1116/1.4788904]
C1 [Liu, Lu; Lo, Chien-Fong; Xi, Yuyin; Wang, Yuxi; Ren, Fan] Univ Florida, Dept Chem Engn, Gainesville, FL 32611 USA.
[Pearton, Stephen J.] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA.
[Kim, Hong-Yeol; Kim, Jihyun] Korea Univ, Dept Chem & Biol Engn, Seoul 136713, South Korea.
[Fitch, Robert C.; Walker, Dennis E., Jr.; Chabak, Kelson D.; Gillespie, James K.; Tetlak, Stephen E.; Via, Glen D.; Crespo, Antonio] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Kravchenko, Ivan I.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37830 USA.
RP Liu, L (reprint author), Univ Florida, Dept Chem Engn, Gainesville, FL 32611 USA.
EM fren@che.ufl.edu
RI LIU, LU/H-2307-2013; Kim, Jihyun/F-6940-2013; Kravchenko,
Ivan/K-3022-2015
OI LIU, LU/0000-0001-7256-3775; Kravchenko, Ivan/0000-0003-4999-5822
FU U.S. DOD HDTRA [1-11-1-0020]; Office of Basic Energy Sciences, U.S.
Department of Energy
FX The work performed at UF was supported by an U.S. DOD HDTRA Grant No.
1-11-1-0020, monitored by James Reed and an AFOSR MURI monitored by
James Huang. A portion of this research was conducted at the Center for
Nanophase Materials Sciences, which is sponsored at Oak Ridge National
Laboratory by the Office of Basic Energy Sciences, U.S. Department of
Energy.
NR 21
TC 19
Z9 19
U1 2
U2 17
PU A V S AMER INST PHYSICS
PI MELVILLE
PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
SN 1071-1023
J9 J VAC SCI TECHNOL B
JI J. Vac. Sci. Technol. B
PD MAR
PY 2013
VL 31
IS 2
AR 022201
DI 10.1116/1.4788904
PG 7
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology;
Physics, Applied
SC Engineering; Science & Technology - Other Topics; Physics
GA 117SG
UT WOS:000316972800043
ER
PT J
AU Fernandes, NJ
Koerner, H
Giannelis, EP
Vaia, RA
AF Fernandes, Nikhil J.
Koerner, Hilmar
Giannelis, Emmanuel P.
Vaia, Richard A.
TI Hairy nanoparticle assemblies as one-component functional polymer
nanocomposites: opportunities and challenges
SO MRS COMMUNICATIONS
LA English
DT Article
ID ORGANIC HYBRID MATERIALS; LIQUID-LIKE BEHAVIOR; SURFACE-INITIATED
POLYMERIZATION; NANOSCALE IONIC MATERIALS; CORE-SHELL NANOPARTICLES;
STAR-SHAPED POLYMERS; THIN-FILM COMPOSITE; ONE-POT SYNTHESIS; SILICA
NANOPARTICLES; GOLD NANOPARTICLES
AB Over the past three decades, the combination of inorganic-nanoparticles and organic-polymers has led to a wide variety of advanced materials, including polymer nanocomposites (PNCs). Recently, synthetic innovations for attaching polymers to nanoparticles to create "hairy nanoparticles" (HNPs) has expanded opportunities in this field. In addition to nanoparticle compatibilization for traditional particle-matrix blending, neat-HNPs afford one-component hybrids, both in composition and properties, which avoids issues of mixing that plague traditional PNCs. Continuous improvements in purity, scalability, and theoretical foundations of structure-performance relationships are critical to achieving design control of neat-HNPs necessary for future applications, ranging from optical, energy, and sensor devices to lubricants, green-bodies, and structures.
C1 [Fernandes, Nikhil J.] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA.
[Koerner, Hilmar; Vaia, Richard A.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Giannelis, Emmanuel P.] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA.
RP Vaia, RA (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM richard.vaia@wpafb.af.mil
OI Fernandes, Nikhil/0000-0002-0195-2885
FU King Abdullah University of Science and Technology (KAUST)
[KUS-C1-018-02]; National Science Foundation [IIP-1114275]; NYSERDA
[18507]; Materials and Manufacturing Directorate of the Air Force
Research Laboratory; Air Force Office of Scientific Research
FX This publication is based on work supported in part by Award No.
KUS-C1-018-02, made by King Abdullah University of Science and
Technology (KAUST). This material is based upon work supported by the
National Science Foundation under Grant No. IIP-1114275 and work
supported by NYSERDA under Grant No. 18507. NYSERDA has not reviewed the
information contained herein, and the opinions expressed in this report
do not necessarily reflect those of NYSERDA or the State of New York.
This work was funded in part by the Materials and Manufacturing
Directorate of the Air Force Research Laboratory and the Air Force
Office of Scientific Research.
NR 151
TC 41
Z9 42
U1 7
U2 175
PU CAMBRIDGE UNIV PRESS
PI NEW YORK
PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA
SN 2159-6859
J9 MRS COMMUN
JI MRS Commun.
PD MAR
PY 2013
VL 3
IS 1
BP 13
EP 29
DI 10.1557/mrc.2013.9
PG 17
WC Materials Science, Multidisciplinary
SC Materials Science
GA 114SA
UT WOS:000316761500002
ER
PT J
AU Hagen, J
Lyon, W
Chushak, Y
Tomczak, M
Naik, R
Stone, M
Kelley-Loughnane, N
AF Hagen, Joshua
Lyon, Wanda
Chushak, Yaroslav
Tomczak, Melanie
Naik, Rajesh
Stone, Morley
Kelley-Loughnane, Nancy
TI Detection of Orexin A Neuropeptide in Biological Fluids Using a Zinc
Oxide Field Effect Transistor
SO ACS CHEMICAL NEUROSCIENCE
LA English
DT Article
DE Orexin A; molecular recognition elements; binding peptide; field effect
transistor; rapid detection; human performance monitoring
ID PROTEIN-PROTEIN DOCKING; RECOGNITION ELEMENTS; PLASMA; PEPTIDES;
RECEPTOR; FUNCTIONALIZATION; PERFORMANCE; NARCOLEPSY; LEPTIN
AB Biomarkers which are indicative of acute physiological and emotional states are studied in a number of different areas in cognitive neuroscience. Currently, many cognitive studies are conducted based on programmed tasks followed by timed biofluid sampling, central laboratory processing, and followed by data analysis. In this work, we present a sensor platform capable of rapid biomarker detection specific for detecting neuropeptide orexin A, found in blood and saliva and known as an indicator of fatigue and cognitive performance. A peptide recognition element that selectively binds to orexin A was designed, characterized, and functionalized onto a zinc oxide field effect transistor to enable rapid detection. The detection limit using the sensor platform was sub-picomolar in water, and picomolar to nanomolar levels in saliva and serum. The transistor and recognition element sensor platform can be easily expanded, allowing for multiple biomarkers to be detected simultaneously, lending itself to complex biomarker analysis applicable to rapid feedback for neuroscience research and physiological monitoring.
C1 [Hagen, Joshua; Lyon, Wanda; Chushak, Yaroslav; Stone, Morley; Kelley-Loughnane, Nancy] USAF, Human Performance Wing 711, Human Effectiveness Directorate, Res Labs, Wright Patterson AFB, OH 45433 USA.
[Tomczak, Melanie; Naik, Rajesh] USAF, Mat & Mfg Directorate, Res Labs, Wright Patterson AFB, OH 45433 USA.
RP Hagen, J (reprint author), USAF, Human Performance Wing 711, Human Effectiveness Directorate, Res Labs, Wright Patterson AFB, OH 45433 USA.
EM joshua.hagen@wpafb.af.mil
FU Air Force Research Laboratory; Bio-X Strategic Technology Thrust; 711th
Chief Scientist Seedling Fund; Air Force Office of Scientific Research;
RX Bio program in the Materials and Manufacturing Directorate
FX This work was supported by the Air Force Research Laboratory, Bio-X
Strategic Technology Thrust, 711th Chief Scientist Seedling Fund, Air
Force Office of Scientific Research, and RX Bio program in the Materials
and Manufacturing Directorate.
NR 41
TC 4
Z9 4
U1 3
U2 31
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1948-7193
J9 ACS CHEM NEUROSCI
JI ACS Chem. Neurosci.
PD MAR
PY 2013
VL 4
IS 3
BP 444
EP 453
DI 10.1021/cn300159e
PG 10
WC Biochemistry & Molecular Biology; Chemistry, Medicinal; Neurosciences
SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Neurosciences
& Neurology
GA 112LQ
UT WOS:000316594100010
PM 23509980
ER
PT J
AU Meylemans, HA
Harvey, BG
Reams, JT
Guenthner, AJ
Cambrea, LR
Groshens, TJ
Baldwin, LC
Garrison, MD
Mabry, JM
AF Meylemans, Heather A.
Harvey, Benjamin G.
Reams, Josiah T.
Guenthner, Andrew J.
Cambrea, Lee R.
Groshens, Thomas J.
Baldwin, Lawrence C.
Garrison, Michael D.
Mabry, Joseph M.
TI Synthesis, Characterization, and Cure Chemistry of Renewable
Bis(cyanate) Esters Derived from 2-Methoxy-4-Methylphenol
SO BIOMACROMOLECULES
LA English
DT Article
ID EPOXY-RESINS; PHENOL-FORMALDEHYDE; TRICYANATE ESTER; LIGNIN; POLYMERS;
POLYURETHANES; POLYESTERS; RESOURCES; KINETICS
AB A series of renewable bis(cyanate) esters have been prepared from bisphenols synthesized by condensation of 2-methoxy-4-methylphenol (creosol) with formaldehyde, acetaldehyde, and propionaldehyde. The cyanate esters have been fully characterized by infrared spectroscopy, H-1 and C-13 NMR spectroscopy, and single crystal X-ray diffraction. These compounds melt from 88 to 143 degrees C, while cured resins have glass transition temperatures from 219 to 248 degrees C, water uptake (96 h, 85 degrees C immersion) in the range of 2.05-3.21%, and wet glass transition temperatures from 174 to 193 degrees C. These properties suggest that creosol-derived cyanate esters may be useful for a wide variety of military and commercial applications. The cure chemistry of the cyanate esters has been studied with FTIR spectroscopy and differential scanning calorimetry. The results show that cyanate esters with more sterically demanding bridging groups cure more slowly, but also more completely than those with a bridging methylene group. In addition to the structural differences, the purity of the cyanate esters has a significant effect on both the cure chemistry and final T-g of the materials. In some cases, post-cure of the resins at 350 degrees C resulted in significant decomposition and off-gassing, but cure protocols that terminated at 250-300 degrees C generated void-free resin pucks without degradation. Thermogravimetric analysis revealed that cured resins were stable up to 400 degrees C and then rapidly degraded. TGA/FTIR and mass spectrometry results showed that the resins decomposed to phenols, isocyanic acid, and secondary decomposition products, including CO2. Char yields of cured resins under N-2 ranged from 27 to 35%, while char yields in air ranged from 8 to 11%. These data suggest that resins of this type may potentially be recycled to parent phenols, creosol, and other alkylated creosols by pyrolysis in the presence of excess water vapor. The ability to synthesize these high temperature resins from a phenol (creosol) that can be derived from lignin, coupled with the potential to recycle the composites, provides a possible route to the production of sustainable, high-performance, thermosetting resins with reduced environmental impact.
C1 [Meylemans, Heather A.; Harvey, Benjamin G.; Cambrea, Lee R.; Groshens, Thomas J.; Baldwin, Lawrence C.; Garrison, Michael D.] USN, Res Dept, Div Chem, NAWCWD, China Lake, CA 93555 USA.
[Reams, Josiah T.; Guenthner, Andrew J.; Mabry, Joseph M.] USAF, Res Lab, Aerosp Syst Directorate, Edwards AFB, CA 93524 USA.
RP Harvey, BG (reprint author), USN, Res Dept, Div Chem, NAWCWD, China Lake, CA 93555 USA.
EM benjamin.g.harvey@navy.mil
FU Strategic Environmental Research and Development Program (SERDP)
[WP-2214]
FX The authors would like to thank Ms. Roxanne Quintana for MS analysis and
the Strategic Environmental Research and Development Program (SERDP)
Project WP-2214 for financial support of this work.
NR 43
TC 28
Z9 28
U1 4
U2 71
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1525-7797
EI 1526-4602
J9 BIOMACROMOLECULES
JI Biomacromolecules
PD MAR
PY 2013
VL 14
IS 3
BP 771
EP 780
DI 10.1021/bm3018438
PG 10
WC Biochemistry & Molecular Biology; Chemistry, Organic; Polymer Science
SC Biochemistry & Molecular Biology; Chemistry; Polymer Science
GA 105DB
UT WOS:000316044700022
PM 23323677
ER
PT J
AU Alexander, AM
AF Alexander, Antoin Marcus
TI Atrial Fibrillation in the Athlete
SO CURRENT SPORTS MEDICINE REPORTS
LA English
DT Review
ID RADIOFREQUENCY CATHETER ABLATION; FOLLOW-UP; PHYSICAL-ACTIVITY; SPORT
PRACTICE; RISK; ARRHYTHMIAS; MANAGEMENT; EFFICACY; PREVALENCE; PATIENT
AB Atrial fibrillation (AF) is the most common arrhythmia in athletes. Evidence supports that it occurs more frequently in endurance athletes than in nonathletes and that it can result in decreased performance or even ineligibility for athletes. Although there is no clear etiology of why the increase in athletes exists, three supported mechanisms include morphologic adaptation, autonomic alteration, and chronic systemic inflammation. Although treatment in athletes can be challenging, type 1C antiarrhythmics are accepted generally as a first-line therapy in addition to risk factor-based anticoagulation. Radiofrequency catheter ablation also has become a recommended treatment for symptomatic paroxysmal AF that is refractory to at least one class 1 or 3 antiarrhythmic medication and a reasonable treatment in symptomatic paroxysmal AF prior to initiation of antiarrhythmic therapy.
C1 David Grant Med Ctr, Travis AFB, CA 94534 USA.
RP Alexander, AM (reprint author), David Grant Med Ctr, 101 Bodin Circle, Travis AFB, CA 94534 USA.
EM Marcusindc10@gmail.com
NR 29
TC 4
Z9 4
U1 0
U2 7
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 1537-890X
J9 CURR SPORT MED REP
JI Curr. Sport. Med. Rep.
PD MAR-APR
PY 2013
VL 12
IS 2
BP 86
EP 92
DI 10.1249/JSR.0b013e3182874aa3
PG 7
WC Sport Sciences
SC Sport Sciences
GA 106DF
UT WOS:000316121400009
PM 23478558
ER
PT J
AU Andreev, AD
Hendricks, KJ
AF Andreev, Andrey D.
Hendricks, Kyle J.
TI Multicavity Magnetron With the "Rodded" Quasi-Metamaterial Cathode
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Cathode priming; computer simulations; metamaterial structures;
relativistic magnetron
ID IN-CELL SIMULATION; FAST OSCILLATION STARTUP; RELATIVISTIC MAGNETRON;
TRANSPARENT CATHODE; MODE; PERFORMANCE; IMPROVEMENT; EMISSION
AB We report on the use of the "rodded" or the longitudinally oriented metal-thin-wire structure as the explosive-emission cathode in high-power multicavity magnetrons. The rodded structure is transparent to the time-varying induced electric field E-1 oscillating orthogonally to the individual rods or wires of the structure. The rods (wires) are longitudinally oriented, i.e., along the magnetron axis and parallel to the external dc axial magnetic field H-0. The mode pattern established within the magnetron resonant cavity corresponds to one of the TE-like cavity modes of the magnetron operation. This allows defining the rodded structure as the quasi-metamaterial (i.e., not-entirely-metamaterial) structure. Particle-in-cell simulations of the U.S. Air Force Research Laboratory's six-cavity (AFRL-A6) L-band magnetron demonstrate that the rodded quasi-metamaterial cathode allows the magnetron to much more faster select the desired 2 pi/3 magnetron operating mode within the broader range of the input operating parameters (from 130 to 200 kV at 0.15 T), as compared with the same magnetron working with the traditional smooth cylindrical cathode (from 140 to 160 kV at 0.15 T).
C1 [Andreev, Andrey D.] Raytheon Missile Syst, Directed Energy Div, Raytheon Ktech, Adv Secur & Directed Energy Syst, Albuquerque, NM 87123 USA.
[Hendricks, Kyle J.] USAF, Res Lab, High Power Microwave Div, Directed Energy Directorate, Albuquerque, NM 87117 USA.
RP Andreev, AD (reprint author), Raytheon Missile Syst, Directed Energy Div, Raytheon Ktech, Adv Secur & Directed Energy Syst, Albuquerque, NM 87123 USA.
NR 41
TC 3
Z9 3
U1 0
U2 5
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD MAR
PY 2013
VL 41
IS 3
BP 620
EP 627
DI 10.1109/TPS.2013.2238558
PG 8
WC Physics, Fluids & Plasmas
SC Physics
GA 107HD
UT WOS:000316205200030
ER
PT J
AU Pettit, TJ
Croxton, KL
Fiksel, J
AF Pettit, Timothy J.
Croxton, Keely L.
Fiksel, Joseph
TI Ensuring Supply Chain Resilience: Development and Implementation of an
Assessment Tool
SO JOURNAL OF BUSINESS LOGISTICS
LA English
DT Article
DE resilience; disruptions; risk management; supply chain management;
vulnerabilities
ID SUSTAINABLE DEVELOPMENT; DISRUPTION RISKS; MANAGEMENT; FRAMEWORK;
MITIGATION; STRATEGIES; OPERATIONS; CAPACITY; DESIGN; RATES
AB In today's tightly connected global economy, traditional management practices that rely on steady-state conditions are challenged by chaotic external pressures and turbulent change. Just in the last few years, the world has experienced a string of catastrophic events, including a global economic meltdown, a volcanic eruption in Iceland, an oil spill in the Gulf of Mexico, a disastrous tsunami and power blackout in Japan, and political upheavals in Africa and the Middle East. Managing the risk of an uncertain future is a challenge that requires resiliencethe ability to survive, adapt, and grow in the face of turbulent change. This research develops a measurement tool titled the Supply Chain Resilience Assessment and Management (SCRAM). Data gathered from seven global manufacturing and service firms are used to validate SCRAM, using qualitative methodology with 1,369 empirical items from focus groups reviewing 14 recent disruptions. Critical linkages are uncovered between the inherent vulnerability factors and controllable capability factors. Through mixed-method triangulation, this research identified 311 specific linkages that can be used to guide a resilience improvement process. Pilot testing suggests a correlation between increased resilience and improved supply chain performance.
C1 [Pettit, Timothy J.] USAF Acad, Colorado Springs, CO 80840 USA.
[Croxton, Keely L.] Ohio State Univ, Fisher Coll Business, Columbus, OH 43210 USA.
[Fiksel, Joseph] Ohio State Univ, Ctr Resilience, Columbus, OH 43210 USA.
RP Pettit, TJ (reprint author), USAF Acad, Dept Management, Fairchild Hall, Colorado Springs, CO 80840 USA.
EM Timothy.pettit@usafa.edu
OI Croxton, Keely/0000-0003-3057-6417
NR 83
TC 34
Z9 35
U1 11
U2 89
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0735-3766
EI 2158-1592
J9 J BUS LOGIST
JI J. Bus. Logist.
PD MAR
PY 2013
VL 34
IS 1
BP 46
EP 76
DI 10.1111/jbl.12009
PG 31
WC Management
SC Business & Economics
GA 112XE
UT WOS:000316627100005
ER
PT J
AU Carlson, DW
Pearson, RD
Haggerty, PF
Strilka, RJ
Abella, BS
Gourley, PE
AF Carlson, Daniel W.
Pearson, Ryan D.
Haggerty, Paul F.
Strilka, Richard J.
Abella, Benjamin S.
Gourley, Paul E.
TI COMMOTIO CORDIS, THERAPEUTIC HYPOTHERMIA, AND EVACUATION FROM A UNITED
STATES MILITARY BASE IN IRAQ
SO JOURNAL OF EMERGENCY MEDICINE
LA English
DT Article
DE commotio cordis; cardiac arrest; therapeutic hypothermia;
cardiopulmonary resuscitation
ID CARDIAC-ARREST; TASK-FORCE; RESUSCITATION; TRAUMA; GUIDELINES;
COMMITTEE; ADULTS; DEATH
AB Background: Therapeutic hypothermia (TH) has been demonstrated to improve clinical outcomes after out-of-hospital ventricular fibrillation (VF) cardiac arrest. It remains unclear if TH can be safely and effectively used in the setting of traumatic arrest. Furthermore, the use of TH methods in the pre-hospital and transport environments remain poorly established and a domain of active investigation. Objectives: To describe a case of successful TH utilization after blunt trauma with commotio cordis and pulmonary contusion, and to describe the continuation of TH during international fixed-wing aeromedical transport. Case Report: A 33-year-old active duty soldier suffered blunt chest trauma and immediate VF arrest. He was successfully resuscitated with cardiopulmonary resuscitation and defibrillation attempts. Given his ensuing comatose post-arrest state, he was therapeutically cooled and subsequently evacuated from Iraq to Germany, with cooling maintenance established in flight without the availability of training or commercial cooling equipment. The patient exhibited an eventual excellent neurologic recovery. To utilize TH for this patient, military physicians with limited local resources employed a telemedical approach to obtain a hypothermia protocol to develop a successful treatment plan. Conclusions: The patient's successful resuscitation suggests that care should not be withheld for blunt trauma patients without vital signs in the field if VF is present, until the differential diagnosis of commotio cordis has been considered. (C) 2013 Elsevier Inc.
C1 [Carlson, Daniel W.] Walter Reed Army Med Ctr, Serv Cardiol, Washington, DC 20307 USA.
[Pearson, Ryan D.] Dept Family Med, Travis AFB, CA USA.
[Haggerty, Paul F.] Dept Internal Med, Wright Patterson AFB, OH USA.
[Strilka, Richard J.] Royal AF Lakenheath, Brandon, Suffolk, England.
[Abella, Benjamin S.] Univ Penn, Ctr Resuscitat Sci, Philadelphia, PA 19104 USA.
[Gourley, Paul E.] Langley AFB, Hampton, VA USA.
RP Abella, BS (reprint author), Univ Penn, Ctr Resuscitat Sci, 3400 Spruce St, Philadelphia, PA 19104 USA.
OI Abella, Benjamin/0000-0003-2521-0891
FU Philips Healthcare
FX Dr. Abella has received honoraria from Medivance Corporation and
unrestricted research funding from Philips Healthcare. The other authors
declare no relevant disclosures.
NR 17
TC 2
Z9 2
U1 0
U2 3
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0736-4679
J9 J EMERG MED
JI J. Emerg. Med.
PD MAR
PY 2013
VL 44
IS 3
BP 620
EP 624
DI 10.1016/j.jemermed.2012.08.014
PG 5
WC Emergency Medicine
SC Emergency Medicine
GA 103VF
UT WOS:000315946900015
PM 23079150
ER
PT J
AU VanDeMark, TF
Johnson, LB
Pitarka, A
Bennett, HH
Simms, JE
Yule, DE
AF VanDeMark, Thomas F.
Johnson, Lars B.
Pitarka, Arben
Bennett, Hollis H., Jr.
Simms, Janet E.
Yule, Don E.
TI Evaluation of Seismic-Acoustic Analysis Methods for a Real-time UXO
Monitoring System
SO JOURNAL OF ENVIRONMENTAL AND ENGINEERING GEOPHYSICS
LA English
DT Article
AB The Department of Defense (DoD) uses over two million rounds of high-explosive (HE) munitions per year (Defense Science Board Task Force, 2003). A small percentage does not explode, thus generating unexploded ordnance (UXO) in current range areas at a substantial rate. As these ranges are closed, the DoD becomes responsible for the environmental restoration of the affected properties. Current methods of UXO remediation are costly because of high false alarm rates. Our current research is to develop a complementary technology that will alleviate false alarm rate by detecting, classifying, and locating UXO in near real time (less than 1 minute) as a munition impacts the range. This technology will utilize an array of buried seismic sensors in a calibrated range area, along with a set of algorithms based on theoretical and applied seismology and statistical analysis.
Initial field tests at three sites focused on developing concepts of the seismic and acoustic location of ordnance impacts. Our research program developed from these initial field tests has four primary objectives: 1) fully implement a wired seismic-acoustic ordnance impact location system for live fire ranges; 2) develop a system capability to discriminate high-order (HE), low-order (partially exploded), and zero-order (UXO) events; 3) reduce location error to a stringent program metric of 1-2 m; and 4) investigate the feasibility of developing a wireless implementation of the technology.
This paper describes the procedures and results from follow-on tests that were conducted in two locations at the U.S. Army Aberdeen Proving Ground (APG), Maryland. These tests were used to evaluate potential seismic-acoustic methods and system configurations for a Seismic-Acoustic Impact Monitoring Assessment (SAIMA) system for mitigating UXO hazards. Significant results from this work include: 1) seismic impulses from low-order impacts were detected at distances up to 1,000 meters; 2) classification features based on measurements of the amplitude of acoustic and seismic phases produce clear discrimination between HE and UXO impacts; 3) calculated location solutions for HE and UXO impacts yield an average location error of 10-20 meters; and 4) empirical observation and waveform modeling demonstrated that surface waves dominate the signal at all distances and therefore should be the primary phase used for all components of analysis. Furthermore, these tests demonstrated the current system design, allowing further enhancements, is capable of meeting the initial research objectives (1) and (2). Future research will focus on improving system performance with refinement of the sensor-layout geometry and the detection and location algorithms through system error analyses and follow-on field testing.
C1 [VanDeMark, Thomas F.; Johnson, Lars B.; Pitarka, Arben] Quantum Technol Sci Inc, Cocoa Beach, FL 32931 USA.
[Bennett, Hollis H., Jr.; Simms, Janet E.; Yule, Don E.] USA, Engineer Res & Dev Ctr, Vicksburg, MS 39180 USA.
RP VanDeMark, TF (reprint author), USAF, Tech Applicat Ctr, 1030 S Highway A1A,Bldg 989, Patrick AFB, FL 32925 USA.
RI pitarka, arben/K-5491-2014
NR 16
TC 1
Z9 1
U1 0
U2 10
PU ENVIRONMENTAL ENGINEERING GEOPHYSICAL SOC
PI DENVER
PA 1720 SOUTH BELLAIRE, STE 110, DENVER, CO 80222-433 USA
SN 1083-1363
J9 J ENVIRON ENG GEOPH
JI J. Environ. Eng. Geophys.
PD MAR
PY 2013
VL 18
IS 1
BP 71
EP 85
DI 10.2113/JEEG18.1.71
PG 15
WC Geochemistry & Geophysics; Engineering, Geological
SC Geochemistry & Geophysics; Engineering
GA 106RZ
UT WOS:000316163700005
ER
PT J
AU Stanford, B
Beran, P
Patil, M
AF Stanford, Bret
Beran, Philip
Patil, Mayuresh
TI Optimal Flapping-Wing Vehicle Dynamics via Floquet Multiplier
Sensitivities
SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
LA English
DT Article
ID DESIGN OPTIMIZATION; FLIGHT; STABILITY; INSECT; SYSTEMS
AB This work considers the trimmed periodic orbits of flapping-wing micro air vehicles, and details the tradeoff between the stability of those orbits (via Floquet theory), their size, and the power needed to sustain them. The nonlinear equations of motion of a body with two rigid flapping wings are coupled to a blade element aerodynamic method, and the periodic shooting method is used to locate the orbit. Analytical sensitivities of the relevant flight metrics, including the Floquet multipliers, are derived with respect to kinematic variables, which enables a gradient. based optimization for maximum stability, minimum power, or minimum orbit size. This is done for hovering, climbing, and forward flight; comparisons between the required kinematics and the resulting flight behavior for each optimal case provide insight into the conflicting metrics. Notably, the optimizer is able to locate designs that are stable in an open-loop sense. However, this effort is not meant to replace the inclusion of a dedicated closed-loop controller: feedback is needed to ensure true station-keeping or trajectory control (particularly in response to large nonlinear disturbances). However, design strategies developed here may assist in the development of controls-oriented frameworks in the future to achieve an appropriate balance between strongly conflicting flight metrics.
C1 [Stanford, Bret; Beran, Philip] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Patil, Mayuresh] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA.
RP Stanford, B (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM bretkennedystanford@gmail.com
RI Patil, Mayuresh/E-4644-2013
OI Patil, Mayuresh/0000-0001-9601-2249
FU U.S. Air Force Office of Scientific Research [09RB01COR, 03VA01COR]; Air
Vehicles Directorate [FA8650-04-D-3446-0035]
FX This work is sponsored by the U.S. Air Force Office of Scientific
Research under laboratory tasks 09RB01COR (monitored by Doug Smith) and
03VA01COR (monitored by Fariba Fahroo), and by the Air Vehicles
Directorate under the Flapping Sciences Integration Program contract
FA8650-04-D-3446-0035.
NR 30
TC 5
Z9 5
U1 0
U2 13
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0731-5090
J9 J GUID CONTROL DYNAM
JI J. Guid. Control Dyn.
PD MAR-APR
PY 2013
VL 36
IS 2
BP 454
EP 466
DI 10.2514/1.57213
PG 13
WC Engineering, Aerospace; Instruments & Instrumentation
SC Engineering; Instruments & Instrumentation
GA 102GF
UT WOS:000315832200009
ER
PT J
AU Zolot, AM
Giorgetta, FR
Baumann, E
Swann, WC
Coddington, I
Newbury, NR
AF Zolot, A. M.
Giorgetta, F. R.
Baumann, E.
Swann, W. C.
Coddington, I.
Newbury, N. R.
TI Broad-band frequency references in the near-infrared: Accurate dual comb
spectroscopy of methane and acetylene
SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
LA English
DT Article
DE Spectroscopy; Methane; Acetylene; Frequency comb
ID MU-M; NOBEL LECTURE; RESOLUTION; REGION; LASERS; CM(-1); INTERFEROMETRY;
SPECTROMETER; (CH4)-C-12; PRECISION
AB The Doppler-limited spectra of methane between 176 THz and 184 THz (5870-6130 cm(-1)) and acetylene between 193 THz and 199 THz (6430-6630 cm(-1)) are acquired via comb-tooth resolved dual comb spectroscopy with frequency accuracy traceable to atomic standards. A least squares analysis of the measured absorbance and phase line shapes provides line center frequencies with absolute accuracy of 0.2 MHz, or less than one thousandth of the room temperature Doppler width.. This accuracy is verified through comparison with previous saturated absorption spectroscopy of 37 strong isolated lines of acetylene. For the methane spectrum, the center frequencies of 46 well-isolated strong lines are determined with similar high accuracy, along with the center frequencies for 1107 non-isolated lines at lower accuracy. The measured methane line-center frequencies have an uncertainty comparable to the few available laser heterodyne measurements in this region but span a much larger optical bandwidth, marking the first broad-band measurements of the methane 2 nu(3) region directly referenced to atomic frequency standards. This study demonstrates the promise of dual comb spectroscopy to obtain high resolution broadband spectra that are comparable to state-of-the-art Fourier-transform spectrometer measurements but with much improved frequency accuracy.
Work of the US government, not subject to US copyright. Published by Elsevier Ltd.
C1 [Zolot, A. M.; Giorgetta, F. R.; Baumann, E.; Swann, W. C.; Coddington, I.; Newbury, N. R.] NIST, Boulder, CO 80305 USA.
[Zolot, A. M.; Newbury, N. R.] USAF, Res Lab, Kirtland AFB, NM 87117 USA.
RP Newbury, NR (reprint author), NIST, 325 Broadway, Boulder, CO 80305 USA.
EM nathan.newbury@nist.gov
RI Giorgetta, Fabrizio/O-1730-2014; Baumann, Esther/P-1315-2015
OI Giorgetta, Fabrizio/0000-0003-2066-3912; Baumann,
Esther/0000-0002-6569-2090
NR 52
TC 23
Z9 23
U1 5
U2 74
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0022-4073
J9 J QUANT SPECTROSC RA
JI J. Quant. Spectrosc. Radiat. Transf.
PD MAR
PY 2013
VL 118
BP 26
EP 39
DI 10.1016/j.jqsrt.2012.11.024
PG 14
WC Optics; Spectroscopy
SC Optics; Spectroscopy
GA 110EG
UT WOS:000316424800004
ER
PT J
AU Senkov, ON
Senkova, SV
Woodward, C
Miracle, DB
AF Senkov, O. N.
Senkova, S. V.
Woodward, C.
Miracle, D. B.
TI Low-density, refractory multi-principal element alloys of the
Cr-Nb-Ti-V-Zr system: Microstructure and phase analysis
SO ACTA MATERIALIA
LA English
DT Article
DE Refractory alloys; Crystal structure; Microstructure; CALPHAD
ID HIGH-ENTROPY ALLOYS; NBCRMO0.5TA0.5TIZR ALLOY; DESIGN
AB The crystal structure, microstructure, density and Vickers hardness of four multi-principal element alloys, NbTiVZr, NbTiV2Zr, CrNbTiZr, and CrNbTiVZr, are reported. The characteristics of these potential new high-temperature structural alloys are explored. The alloys were prepared by vacuum arc melting followed by hot isostatic pressing (at 1200 degrees C, 207 MPa for 1 h) and homogenization annealing (at 1200 degrees C for 24 h). The alloys have densities of 6.52, 6.34, 6.67 and 6.57 g cm(-3), and Vickers microhardness values of 3.29, 2.99, 4.10 and 4.72 GPa, respectively. The NbTiVZr alloy is essentially a single-phase alloy consisting of a coarse-grained disordered body-centered cubic (bcc) phase with fine, submicron-size precipitates inside the grains. The NbTiV2Zr alloy contains three disordered bcc phases. The CrNbTiZr and CrNbTiVZr alloys contain a disordered bcc phase and an ordered Laves phase. The lattice parameters and compositions of the identified phases are reported. The experimental data are compared with the results of the thermodynamic modeling of non-equilibrium and equilibrium phases in these alloys. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Senkov, O. N.; Senkova, S. V.; Woodward, C.; Miracle, D. B.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Senkov, ON (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM oleg.senkov@wpafb.af.mil
RI Senkov, Oleg/C-7197-2012
OI Senkov, Oleg/0000-0001-5587-415X
FU Air Force Research Laboratory Director's fund; Air Force on-site
Contract [FA8650-10-D-5226]
FX This work was supported through the Air Force Research Laboratory
Director's fund and through the Air Force on-site Contract No.
FA8650-10-D-5226 conducted by UES, Inc., Dayton, Ohio.
NR 14
TC 88
Z9 88
U1 23
U2 143
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD MAR
PY 2013
VL 61
IS 5
BP 1545
EP 1557
DI 10.1016/j.actamat.2012.11.032
PG 13
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 105AA
UT WOS:000316036800013
ER
PT J
AU Anderson, JR
Stith, SM
Johnson, MD
Strachman-Miller, MM
Amanor-Boadu, Y
Linkh, DJ
AF Anderson, Jared R.
Stith, Sandra M.
Johnson, Matthew D.
Strachman-Miller, Marjorie M.
Amanor-Boadu, Yvonne
Linkh, David J.
TI Multi-Couple Group and Self-Directed PREP Formats Enhance Relationship
Satisfaction and Improve Anger Management Skills in Air Force Couples
SO AMERICAN JOURNAL OF FAMILY THERAPY
LA English
DT Article
ID RELATIONSHIP EDUCATION; MARITAL DISTRESS; PREVENTION; COMMUNICATION;
MARRIAGE; EPREP; WORK; RISK
AB This study examined the effectiveness of delivering the Prevention and Relationship Enhancement Program (PREP) to volunteer couples in the U.S. Air Force in either a six-week instructional multi-couple group condition or a self-directed book condition. A standardized pre/post protocol was employed and outcomes included relationship satisfaction and anger management skills, two known risk factors for partner maltreatment. Significant improvement was found for the group condition in both relationship satisfaction and anger management skills, but only for anger management skills in the self-directed book condition. Finally, the group condition reported greater program satisfaction. Implications are discussed.
C1 [Anderson, Jared R.; Stith, Sandra M.; Strachman-Miller, Marjorie M.; Amanor-Boadu, Yvonne] Kansas State Univ, Sch Family Studies & Human Serv, Manhattan, KS 66506 USA.
[Johnson, Matthew D.] Univ Alberta, Dept Human Ecol, Edmonton, AB, Canada.
[Linkh, David J.] USAF, Family Advocacy Program, San Antonio, TX USA.
RP Anderson, JR (reprint author), Kansas State Univ, Sch Family Studies & Human Serv, 113 Campus Creek Complex, Manhattan, KS 66506 USA.
EM jra@ksu.edu
NR 23
TC 1
Z9 1
U1 1
U2 8
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 0192-6187
J9 AM J FAM THER
JI Am. J. Fam. Ther.
PD MAR 1
PY 2013
VL 41
IS 2
BP 121
EP 133
DI 10.1080/01926187.2012.671104
PG 13
WC Psychology, Clinical; Family Studies
SC Psychology; Family Studies
GA 098YD
UT WOS:000315584100003
ER
PT J
AU Tankersley, MS
AF Tankersley, Michael S.
TI I'm not strange, I'm just like you
SO ANNALS OF ALLERGY ASTHMA & IMMUNOLOGY
LA English
DT Editorial Material
ID IMPORTED FIRE ANT; IMMUNOTHERAPY
C1 USAF, Personnel Ctr, Phys Educ Branch, Joint Base San Antonio R, TX USA.
RP Tankersley, MS (reprint author), USAF, Personnel Ctr, Phys Educ Branch, Joint Base San Antonio R, TX USA.
EM michael.tankersley@us.af.mil
NR 9
TC 0
Z9 0
U1 0
U2 0
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 1081-1206
J9 ANN ALLERG ASTHMA IM
JI Ann. Allergy Asthma Immunol.
PD MAR
PY 2013
VL 110
IS 3
BP 131
EP 132
DI 10.1016/j.anai.2013.01.010
PG 2
WC Allergy; Immunology
SC Allergy; Immunology
GA 101XM
UT WOS:000315807700001
PM 23548518
ER
PT J
AU Stokes, SC
Quinn, JM
Sacha, JJ
White, KM
AF Stokes, Shayne C.
Quinn, James M.
Sacha, Joshua J.
White, Kevin M.
TI Adherence to imported fire ant subcutaneous immunotherapy
SO ANNALS OF ALLERGY ASTHMA & IMMUNOLOGY
LA English
DT Article
ID ALLERGEN IMMUNOTHERAPY; PATIENT COMPLIANCE
AB Background: Imported fire ant (IFA) subcutaneous immunotherapy (SCIT) is safe and effective. For optimal protection, SCIT is given monthly for 3 to 5 years. Successful outcomes require patient adherence.
Objective: To evaluate SCIT adherence in IFA allergic patients in an endemic area.
Methods: Patients with systemic reactions to an IFA sting, with detectable specific IgE, who received a recommendation to start IFA SCIT were included. Initial reaction severity and demographic data were collected. Patients were contacted at 1 year regarding interval reactions to stings, SCIT adherence, and reason for nonadherence. Adherence rates were analyzed for association with age, sex, and severity of initial reaction.
Results: Seventy-six patients were enrolled, and 71% adhered to the recommendation to start IFA SCIT. Subgroup analysis did not find significant differences. At 1 year, 97% completed follow-up for analysis, and only 35% remained adherent. Subgroup analysis did not find significant differences. Inconvenience and fear were reported as reasons for not following the recommendation to start or continue with IFA SCIT.
Conclusion: IFA SCIT is a life-saving therapy that is safe and effective. Despite this, only 71% followed the recommendation to start, and at 1 year only 35% remained adherent. Adherence was not statistically related to age, sex, or severity of initial reaction. Logistical constraints and fear were significant impediments. (C) 2013 American College of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved.
C1 [Stokes, Shayne C.; Quinn, James M.; Sacha, Joshua J.; White, Kevin M.] Wilford Hall USAF Med Ctr, Div Allergy & Immunol, Dept Med, San Antonio, TX 78236 USA.
RP Stokes, SC (reprint author), Wilford Hall USAF Med Ctr, Allergy & Immunol Div, Dept Med, 2200 Bergquist Dr,Suite 1, Lackland AFB, TX 78236 USA.
EM shayne.stokes@us.af.mil
OI White, Kevin/0000-0001-7723-3257
FU US Air Force
FX This study was supported by the US Air Force.
NR 13
TC 7
Z9 7
U1 0
U2 4
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 1081-1206
J9 ANN ALLERG ASTHMA IM
JI Ann. Allergy Asthma Immunol.
PD MAR
PY 2013
VL 110
IS 3
BP 165
EP 167
DI 10.1016/j.anai.2012.11.010
PG 3
WC Allergy; Immunology
SC Allergy; Immunology
GA 101XM
UT WOS:000315807700008
PM 23548525
ER
PT J
AU Sikora, JM
Tankersley, MS
AF Sikora, Jeremy M.
Tankersley, Michael S.
CA ACAAI Immunotherapy Diagnostics Co
TI Perception and practice of sublingual immunotherapy among practicing
allergists in the United States: a follow-up survey
SO ANNALS OF ALLERGY ASTHMA & IMMUNOLOGY
LA English
DT Article
ID EFFICACY; SAFETY; TABLET; RHINOCONJUNCTIVITIS; RHINITIS
AB Background: Limited information regarding current trends of sublingual immunotherapy (SLIT) use, perception, and prescribing patterns among allergists in the United States is available.
Objective: To obtain information about current allergist perception and practice of SLIT compared with 2007.
Methods: On behalf of the American College of Allergy, Asthma and Immunology (ACAAI) Immunotherapy and Diagnostics Committee, an electronic survey was sent to all practicing allergists of the ACAAI in August 2011.
Results: Fifty-nine of 519 US respondents (11.4%) reported experience using SLIT compared with 45 of 766 (5.9%) in 2007 (P <.001). Lack of Food and Drug Administration (FDA) approval was the primary barrier in using SLIT in the United States among 469 of 520 respondents (90.2%), which was increased from 471 of 763 (61.7%) in 2007 (P <.001). Among US respondents, 344 of 516 (66.7%) believed that SLIT was safer than subcutaneous immunotherapy (SCIT) compared with 554 of 755 (73.4%) in 2007 (P <.01). In total, 22 of 51 SLIT users (43.1%) reported SLIT efficacy equal to or even greater than SCIT, which was similar to 21 of 38 (55.3%) reported in 2007 (P <.36).
Conclusion: Rates of SLIT use reported by US respondents have nearly doubled in the last 4 years, with 11.4% of US respondents reporting SLIT use. Because the greatest barrier to SLIT use in the United States is the lack of FDA approval, it is anticipated that once an FDA-approved product is available, there will be widespread use of SLIT in the United States. Practice guidelines, which include effective dosages and schedules, will be critical to the broad implementation of SLIT in the United States. (C) 2013 American College of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved.
C1 [Sikora, Jeremy M.; Tankersley, Michael S.; ACAAI Immunotherapy Diagnostics Co] Wilford Hall Ambulatory Surg Ctr, Div Allergy & Immunol, Dept Med, San Antonio, TX USA.
RP Sikora, JM (reprint author), Div Allergy & Immunol, 4881 Sugar Maple Dr, Wright Patterson AFB, OH 45433 USA.
EM jeremy.sikora@wpafb.af.mil
FU US Department of the Air Force
FX This study was funded by the US Department of the Air Force.
NR 19
TC 31
Z9 31
U1 0
U2 4
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 1081-1206
J9 ANN ALLERG ASTHMA IM
JI Ann. Allergy Asthma Immunol.
PD MAR
PY 2013
VL 110
IS 3
BP 194
EP +
DI 10.1016/j.anai.2012.12.014
PG 8
WC Allergy; Immunology
SC Allergy; Immunology
GA 101XM
UT WOS:000315807700014
PM 23548531
ER
PT J
AU Afrooz, ARMN
Sivalapalan, ST
Murphy, CJ
Hussain, SM
Schlager, JJ
Saleh, NB
AF Afrooz, A. R. M. Nabiul
Sivalapalan, Sean T.
Murphy, Catherine J.
Hussain, Saber M.
Schlager, John J.
Saleh, Navid B.
TI Spheres vs. rods: The shape of gold nanoparticles influences aggregation
and deposition behavior
SO CHEMOSPHERE
LA English
DT Article
DE Gold nanorods; Gold nanospheres; Shape; Aggregation; Deposition;
Poly(acrylic acid)
ID AQUEOUS-SOLUTION; PARTICLE-SIZE; ASPECT-RATIO; NANORODS; SURFACE;
KINETICS; SCATTERING; STABILITY; TOXICITY; CRYSTALS
AB The influence of shape on nanomaterial aggregation and deposition was systematically studied with poly-acrylic acid (PAA) coated uniform-sized gold nanospheres (AuNSs) and nanorods (AuNRs). Time resolved dynamic light scattering was employed to study their aggregation kinetics in a wide range of mono- and di-valent electrolyte conditions. Results indicated that PAA coated AuNSs have higher aggregation propensity compared to anisotropic PAA coated AuNRs, as observed through critical coagulation concentration (CCC). The CCC values were estimated as 50 mM NaCl and 1.8 mM CaCl2 for AuNS, which showed substantial increase to 250 mM NaCl and 7 mM CaCl2 for anisotropic AuNRs. Though electrokinetic behavior showed similar surface potential for the spherical and rod-shaped materials, the geometric differences between the samples have likely resulted in unique conformation of the PAA coatings, leading to different magnitudes of steric hindrances and hence yielding the observed aggregation behavior. The deposition kinetics was monitored using the quartz crystal microbalance with dissipation technique. AuNRs showed relatively slower deposition compared to AuNSs for low electrolytes concentrations. With the increase in electrolyte concentration, the differences in deposition rates between spheres and rods diminished. The results from this study showed that the shape of nanomaterials can influence interfacial properties and result in unique aggregation and deposition behavior under typical aquatic conditions. (c) 2012 Elsevier Ltd. All rights reserved.
C1 [Afrooz, A. R. M. Nabiul; Saleh, Navid B.] Univ S Carolina, Dept Civil & Environm Engn, Columbia, SC 29208 USA.
[Sivalapalan, Sean T.; Murphy, Catherine J.] Univ Illinois, Dept Chem, Urbana, IL 61801 USA.
[Hussain, Saber M.] USAF, Human Effectiveness Directorate, Res Lab, Dayton, OH 45431 USA.
[Schlager, John J.] USAF, Mol Bioeffects Branch, Res Lab, Dayton, OH 45431 USA.
RP Saleh, NB (reprint author), Univ S Carolina, Dept Civil & Environm Engn, Columbia, SC 29208 USA.
EM salehn@engr.sc.edu
OI Afrooz, ARM/0000-0002-9141-9426; Murphy, Catherine/0000-0001-7066-5575
FU US Air Force Research Lab [FA 8650-10-2-6062]
FX Funding was provided by the US Air Force Research Lab (Award# FA
8650-10-2-6062). We are grateful to Dr. Haijun Qian of Clemson
Microscopy Center for his kind assistance in TEM imaging.
NR 39
TC 15
Z9 15
U1 1
U2 107
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0045-6535
J9 CHEMOSPHERE
JI Chemosphere
PD MAR
PY 2013
VL 91
IS 1
BP 93
EP 98
DI 10.1016/j.chemosphere.2012.11.031
PG 6
WC Environmental Sciences
SC Environmental Sciences & Ecology
GA 099IW
UT WOS:000315615700015
PM 23246723
ER
PT J
AU Armani, CJ
Ruggles-Wrenn, MB
Fair, GE
Hay, RS
AF Armani, Clinton J.
Ruggles-Wrenn, Marina B.
Fair, Geoff E.
Hay, Randall S.
TI Creep of Nextel (TM) 610 Fiber at 1100 degrees C in Air and in Steam
SO INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
LA English
DT Article
ID CERAMIC-MATRIX COMPOSITES; ALUMINA-BASED FIBERS; 1200 DEGREES-C;
HIGH-TEMPERATURE; ELEVATED-TEMPERATURES; TENSILE-STRENGTH; MECHANICAL
CHARACTERISTICS; FATIGUE BEHAVIOR; SILICON-NITRIDE; STRESS RUPTURE
AB Creep of Nextel610 fibers was investigated at 1100 degrees C and 100500MPa in air and in steam. The effect of loading rate on fiber tensile strength was also explored. The presence of steam accelerated creep and reduced fiber lifetimes. Loading rate had a considerable effect on tensile strength in steam, but not in air. A linear elastic crack growth model was used to predict the creep lifetimes from the constant loading rate data. The dependence of tensile strength on loading rate and the predictability of creep lifetimes suggest that the failure mechanism in steam was environmentally assisted subcritical crack growth. The creep-rupture data were analyzed in terms of a Monkman-Grant (MG) relationship. Monkman-Grant parameters for creep-rupture data were the same in steam and air, and predicted creep-rupture at 1100 degrees C in both environments. A grain-size increase of about 25% was observed by TEM after 100h at 1100 degrees C in steam, which was about two times that observed in air.
C1 [Armani, Clinton J.; Ruggles-Wrenn, Marina B.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Fair, Geoff E.; Hay, Randall S.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Armani, CJ (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM marina.ruggles-wrenn@afit.edu
RI Ruggles-Wrenn, Marina/J-6103-2014
NR 66
TC 12
Z9 12
U1 3
U2 30
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 1546-542X
J9 INT J APPL CERAM TEC
JI Int. J. Appl. Ceram. Technol.
PD MAR-APR
PY 2013
VL 10
IS 2
BP 276
EP 284
DI 10.1111/j.1744-7402.2012.02831.x
PG 9
WC Materials Science, Ceramics
SC Materials Science
GA 102PZ
UT WOS:000315857800009
ER
PT J
AU Carney, CM
Parthasarathy, TA
Cinibulk, MK
AF Carney, Carmen M.
Parthasarathy, Triplicane A.
Cinibulk, Michael K.
TI Separating Test Artifacts from Material Behavior in the Oxidation
Studies of HfB2-SiC at 2000 degrees C and Above
SO INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
LA English
DT Article
ID HIGH TEMPERATURE CERAMICS; ZIRCONIUM DIBORIDE; HAFNIUM; CARBIDE;
COMPOSITES; RESISTANCE; SYSTEMS; DESIGN; ZRB2
AB Oxidation characteristics of HfB2-15vol% SiC prepared by field-assisted sintering was examined at 2000 degrees C by heating it in a zirconia-resistance furnace and by direct electrical resistance heating of the sample. Limitations of the material and the direct electrical resistance heating apparatus were explored by heating samples multiple times and to temperatures in excess of 2300 degrees C. Oxide scales that developed at 2000 degrees C from both methods were similar in that they consisted of a SiO2/HfO2 outer layer, a porous HfO2 layer, and a HfB2 layer depleted of SiC. But they differed in scale thicknesses, impurities present, scale morphology/complexity. Possible test artifacts are discussed.
C1 [Carney, Carmen M.; Parthasarathy, Triplicane A.] Universal Energy Syst Inc, Dayton, OH 45432 USA.
[Cinibulk, Michael K.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Carney, CM (reprint author), Universal Energy Syst Inc, Dayton, OH 45432 USA.
EM carmen.carney@wpafb.af.mil
FU United States Air Force [FA8650-10-D-5226]
FX This study was supported by the United States Air Force Contract #
FA8650-10-D-5226.
NR 24
TC 8
Z9 8
U1 1
U2 28
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 1546-542X
J9 INT J APPL CERAM TEC
JI Int. J. Appl. Ceram. Technol.
PD MAR-APR
PY 2013
VL 10
IS 2
BP 293
EP 300
DI 10.1111/j.1744-7402.2011.02730.x
PG 8
WC Materials Science, Ceramics
SC Materials Science
GA 102PZ
UT WOS:000315857800011
ER
PT J
AU Benton, SI
Bons, JP
Sondergaard, R
AF Benton, Stuart I.
Bons, Jeffrey P.
Sondergaard, Rolf
TI Secondary Flow Loss Reduction Through Blowing for a High-Lift
Front-Loaded Low Pressure Turbine Cascade
SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
LA English
DT Article
ID VORTEX-GENERATOR JETS; COMPRESSOR CASCADE; SEPARATION CONTROL; ENDWALL
AB Efforts to increase individual blade loading in the low pressure turbine have resulted in blade geometries optimized for midspan performance. Many researchers have shown that increased blade loading and a front-loaded pressure distribution each separately contribute to increased losses in the endwall region. A detailed investigation of the baseline endwall flow of the L2F profile, which is a high-lift front loaded profile, is performed. In-plane velocity vectors and total pressure loss maps are obtained in five planes oriented normal to the blade surface for three Reynolds numbers. A row of pitched and skewed jets are introduced near the endwall on the suction surface of the blade. The flow control method is evaluated for four momentum coefficients at the high Reynolds number, with a maximum reduction of 42% in the area averaged total pressure loss coefficient. The same blade is also fitted with midspan vortex-generator jets and is tested at a Reynolds number of 20,000, resulting in a 21% reduction in the area averaged total pressure loss. [DOI: 10.1115/1.4007531]
C1 [Benton, Stuart I.; Bons, Jeffrey P.] Ohio State Univ, Dept Mech & Aerosp Engn, Columbus, OH 43235 USA.
[Sondergaard, Rolf] USAF, Res Lab, Aerosp Engineer Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Benton, SI (reprint author), Ohio State Univ, Dept Mech & Aerosp Engn, 2300 West Case Rd, Columbus, OH 43235 USA.
EM benton.53@osu.edu; bons.2@osu.edu; rolf.sondergaard@wpafb.af.mil
RI Bons, Jeffrey/N-9854-2014
FU Dayton Area Graduate Studies Institute through the AFRL/DAGSI Ohio
Student-Faculty Research Fellowship
FX The authors would like to acknowledge the financial support of The
Dayton Area Graduate Studies Institute through the AFRL/DAGSI Ohio
Student-Faculty Research Fellowship.
NR 24
TC 6
Z9 6
U1 1
U2 11
PU ASME
PI NEW YORK
PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0889-504X
J9 J TURBOMACH
JI J. Turbomach.-Trans. ASME
PD MAR
PY 2013
VL 135
IS 2
AR 021020
DI 10.1115/1.4007531
PG 8
WC Engineering, Mechanical
SC Engineering
GA 094KB
UT WOS:000315260400020
ER
PT J
AU Knezevic, M
Lebensohn, RA
Cazacu, O
Revil-Baudard, B
Proust, G
Vogel, SC
Nixon, ME
AF Knezevic, Marko
Lebensohn, Ricardo A.
Cazacu, Oana
Revil-Baudard, Benoit
Proust, Gwenaelle
Vogel, Sven C.
Nixon, Michael E.
TI Modeling bending of alpha-titanium with embedded polycrystal plasticity
in implicit finite elements
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Titanium alloys; Crystal plasticity; Texture; Twinning Finite element
method; EBSD
ID CRYSTALLOGRAPHIC TEXTURE EVOLUTION; ANISOTROPIC RESPONSE; HEXAGONAL
MATERIALS; ZIRCONIUM ALLOYS; DEFORMATION; MICROSTRUCTURE; METALS;
SIMULATION; SLIP
AB An accurate description of the mechanical response of alpha-titanium requires consideration of mechanical anisotropy. In this work we adapt a polycrystal self-consistent model embedded in finite elements to simulate deformation of textured alpha-titanium under quasi-static conditions at room temperature. Monotonic tensile and compressive macroscopic stress-strain curves, electron backscattered diffraction and neutron diffraction data are used to calibrate and validate the model. We show that the model captures with great accuracy the anisotropic strain hardening and texture evolution in the material. Comparisons between predictions and experimental data allow us to elucidate the role that the different plastic deformation mechanisms play in determining microstructure and texture evolution. The polycrystal model, embedded in an implicit finite element code, is then used to simulate geometrical changes in bending experiments of alpha-titanium bars. These predictions, together with results of a macroscopic allotropic elasto-plastic model that accounts for evolving anisotropy, are compared with the experiments. Both models accurately capture the experimentally observed upward shift of the neutral axis as well as the rigidity of the material response along hard-to-deform crystallographic < c > direction. (C) 2012 Elsevier B.V. All rights reserved.
C1 [Knezevic, Marko; Lebensohn, Ricardo A.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
[Cazacu, Oana; Revil-Baudard, Benoit] Univ Florida, Dept Mech & Aerosp Engn, REEF, Shalimar, FL 32539 USA.
[Proust, Gwenaelle] Univ Sydney, Sch Civil Engn, Sydney, NSW 2006, Australia.
[Vogel, Sven C.] Los Alamos Natl Lab, Los Alamos Neutron Sci Ctr, Los Alamos, NM 87545 USA.
[Nixon, Michael E.] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
RP Knezevic, M (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
EM knezevic@lanl.gov
RI Lebensohn, Ricardo/A-2494-2008; Lujan Center, LANL/G-4896-2012; Cazacu,
Oana/L-4635-2016; Revil-Baudard, Benoit/L-5576-2016
OI Lebensohn, Ricardo/0000-0002-3152-9105; Cazacu,
Oana/0000-0002-2499-9096; Revil-Baudard, Benoit/0000-0001-8682-5035
FU Seaborg Institute; LANL/LDRD Program; U.S. Department of Energy; LANL's
Joint DOD/DOE Munitions Technology Program
FX M. Knezevic gratefully acknowledges the Seaborg Institute for the
Post-Doctoral Fellowship through the LANL/LDRD Program with the U.S.
Department of Energy. R.A. Lebensohn acknowledges support from LANL's
Joint DOD/DOE Munitions Technology Program. The authors also acknowledge
the facilities, and the scientific and technical assistance, of the
Australian Microscopy & Microanalysis Research Facility at the
Australian Centre for Microscopy and Microanalysis, The University of
Sydney, especially Dr. Pat Trimby for his help with the EBSD data
collection.
NR 34
TC 56
Z9 56
U1 1
U2 30
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD MAR 1
PY 2013
VL 564
BP 116
EP 126
DI 10.1016/j.msea.2012.11.037
PG 11
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 101AR
UT WOS:000315748100017
ER
PT J
AU Zhang, BY
Hendrickson, J
Guo, JP
AF Zhang, Boyang
Hendrickson, Joshua
Guo, Junpeng
TI Multispectral near-perfect metamaterial absorbers using spatially
multiplexed plasmon resonance metal square structures
SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
LA English
DT Article
ID VISIBLE FREQUENCIES; TERAHERTZ REGIME; TOTAL ABSORPTION; BAND; LIGHT;
MULTIBAND; BROAD; ANOMALIES; SURFACES; GRATINGS
AB Near-perfect IR light absorption at multiple wavelengths has been experimentally demonstrated by using multiplexed metal square plasmonic resonance structures. Optical power absorption over 95% has been observed in dual-band metamaterial absorbers at two separate wavelengths, and optical power absorption over 92.5% has been observed in triple-band metamaterial absorbers at three separate wavelengths. The peak absorption wavelengths are primarily determined by the sizes of the metal squares in the multiplexed structures. Electrical field distributions in the middle of the dielectric spacer layer were calculated at the peak absorption wavelengths. It is found that the strong light absorption corresponds to local quadrupole plasmon resonance modes in the metamaterial structures. (c) 2013 Optical Society of America
C1 [Zhang, Boyang; Guo, Junpeng] Univ Alabama, Dept Elect & Comp Engn, Huntsville, AL 35899 USA.
[Hendrickson, Joshua] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Guo, JP (reprint author), Univ Alabama, Dept Elect & Comp Engn, Huntsville, AL 35899 USA.
EM guoj@uah.edu
FU National Science Foundation (NSF) [NSF-0814103]; Air Force Office of
Scientific Research [12RY05COR]
FX B. Zhang and J. Guo acknowledge the support by the National Science
Foundation (NSF) through grant NSF-0814103. J. Hendrickson would like to
acknowledge support from the Air Force Office of Scientific Research
(program manager Dr. Gernot Pomrenke) under contract number 12RY05COR.
The authors would also like to thank Jodie Shoaf for AFM measurements.
NR 43
TC 40
Z9 40
U1 6
U2 70
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 0740-3224
J9 J OPT SOC AM B
JI J. Opt. Soc. Am. B-Opt. Phys.
PD MAR
PY 2013
VL 30
IS 3
BP 656
EP 662
PG 7
WC Optics
SC Optics
GA 099EO
UT WOS:000315603400026
ER
PT J
AU Mathews, K
AF Mathews, Kirk
TI Random Sampling from the Klein-Nishina Distribution: Efficiency,
Parsimony, and Speed
SO NUCLEAR SCIENCE AND ENGINEERING
LA English
DT Article
AB Many Monte Carlo photon transport codes draw samples of the scattering cosine, and corresponding energy loss, for Compton scatter from the Klein-Nishina differential scattering cross section. We present new schemes for sampling by rejection that offer advantages in run time, parsimony in use of random numbers, and/or acceptance efficiency. These are compared with Kahn's method, which was recommended by Lux and Koblinger in 1991. We conclude with recommendations for both algorithmic and table-based approaches.
C1 USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Mathews, K (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM Kirk.Mathews@afit.edu
NR 7
TC 0
Z9 0
U1 0
U2 3
PU AMER NUCLEAR SOC
PI LA GRANGE PK
PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA
SN 0029-5639
J9 NUCL SCI ENG
JI Nucl. Sci. Eng.
PD MAR
PY 2013
VL 173
IS 3
BP 207
EP 221
PG 15
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 098IG
UT WOS:000315542100001
ER
PT J
AU Sabol, C
Hill, K
Alfriend, K
Sukut, T
AF Sabol, C.
Hill, K.
Alfriend, K.
Sukut, T.
TI Nonlinear effects in the correlation of tracks and covariance
propagation
SO ACTA ASTRONAUTICA
LA English
DT Article
DE Astrodynamics; Covariance propagation
AB Even though there are methods for the nonlinear propagation of the covariance the propagation of the covariance in current operational programs is based on the state transition matrix of the 1st variational equations, thus it is a linear propagation. If the measurement errors are zero mean Gaussian, the orbit errors, statistically represented by the covariance, are Gaussian. When the orbit errors become too large they are no longer Gaussian and not represented by the covariance. One use of the covariance is the association of uncorrelated tracks (UCTs). A UCT is an object tracked by a space surveillance system that does not correlate to another object in the space object data base. For an object to be entered into the data base three or more tracks must be correlated. Associating UCTs is a major challenge for a space surveillance system since every object entered into the space object catalog begins as a UCT. It has been proved that if the orbit errors are Gaussian, the error ellipsoid represented by the covariance is the optimum association volume. When the time between tracks becomes large, hours or even days, the orbit errors can become large and are no longer Gaussian, and this has a negative effect on the association of UCfs. This paper further investigates the nonlinear effects on the accuracy of the covariance for use in correlation. The use of the best coordinate system and the unscented Kalman Filter (UKF) for providing a more accurate covariance are investigated along with assessing how these approaches would result in the ability to correlate tracks that are further separated in time. (C) 2012 IAA. Published by Elsevier Ltd. All rights reserved.
C1 [Sabol, C.] USAF, Res Lab, Wright Patterson AFB, OH USA.
[Hill, K.] Pacific Def Solut, Kihei, HI USA.
[Alfriend, K.] Texas A&M Univ, College Stn, TX 77843 USA.
[Sukut, T.] USAF, Wright Patterson AFB, OH USA.
RP Alfriend, K (reprint author), Texas A&M Univ, College Stn, TX 77843 USA.
EM keric.hill@pacificds.com; Alfriend@tamu.edu
NR 15
TC 2
Z9 2
U1 0
U2 8
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0094-5765
J9 ACTA ASTRONAUT
JI Acta Astronaut.
PD MAR-APR
PY 2013
VL 84
BP 69
EP 80
DI 10.1016/j.actaastro.2012.08.023
PG 12
WC Engineering, Aerospace
SC Engineering
GA 091VL
UT WOS:000315077800007
ER
PT J
AU Le, HP
Cambier, JL
Cole, LK
AF Le, Hai P.
Cambier, Jean-Luc
Cole, Lord K.
TI GPU-based flow simulation with detailed chemical kinetics
SO COMPUTER PHYSICS COMMUNICATIONS
LA English
DT Article
DE Computational fluid dynamics; GPU; Chemical kinetics; Finite volume;
Cellular detonation
ID ADER SCHEMES; DYNAMICS
AB The current paper reports on the implementation of a numerical solver on the Graphic Processing Units (GPUs) to model reactive gas mixtures with detailed chemical kinetics. The solver incorporates high-order finite volume methods for solving the fluid dynamical equations coupled with stiff source terms. The chemical kinetics are solved implicitly via an operator-splitting method. We explored different approaches in implementing a fast kinetics solver on the GPU. The detail of the implementation is discussed in the paper. The solver is tested with two high-order shock capturing schemes: MP5 (Suresh and Huynh, 1997) [9] and ADERWENO (Titarev and Toro, 2005)[10]. Considering only the fluid dynamics calculation, the speed-up factors obtained are 30 for the MP5 scheme and 55 for ADERWENO scheme. For the fully-coupled solver, the performance gain depended on the size of the reaction mechanism. Two different examples of chemistry were explored. The first mechanism consisted of 9 species and 38 reactions, resulting in a speed-up factor up to 35. The second, larger mechanism, consisted of 36 species and 308 reactions, resulting in a speed-up factor of up to 40. (C) 2012 Elsevier B.V. All rights reserved.
C1 [Le, Hai P.; Cole, Lord K.] Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USA.
[Cambier, Jean-Luc] USAF, Res Lab, Edwards Afb, CA 93524 USA.
RP Le, HP (reprint author), Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USA.
EM hai.le@ucla.edu
NR 22
TC 7
Z9 7
U1 0
U2 11
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0010-4655
J9 COMPUT PHYS COMMUN
JI Comput. Phys. Commun.
PD MAR
PY 2013
VL 184
IS 3
BP 596
EP 606
DI 10.1016/j.cpc.2012.10.013
PG 11
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 092MA
UT WOS:000315125500017
ER
PT J
AU Mixon, DG
Quinn, CJ
Kiyavash, N
Fickus, M
AF Mixon, Dustin G.
Quinn, Christopher J.
Kiyavash, Negar
Fickus, Matthew
TI Fingerprinting With Equiangular Tight Frames
SO IEEE TRANSACTIONS ON INFORMATION THEORY
LA English
DT Article
DE Collusion attacks; digital fingerprinting; frames
ID MULTIMEDIA; CODES; WATERMARKING; CAPACITY; ATTACKS; SCHEME; GAME
AB Digital fingerprinting is a framework for marking media files, such as images, music, or movies, with user-specific signatures to deter illegal distribution. Multiple users can collude to produce a forgery that can potentially overcome a fingerprinting system. This paper proposes an equiangular tight frame fingerprint design which is robust to such collusion attacks. We motivate this design by considering digital fingerprinting in terms of compressed sensing. The attack is modeled as linear averaging of multiple marked copies before adding a Gaussian noise vector. The content owner can then determine guilt by exploiting correlation between each user's fingerprint and the forged copy. The worst case error probability of this detection scheme is analyzed and bounded. Simulation results demonstrate that the average-case performance is similar to the performance of orthogonal and simplex fingerprint designs, while accommodating several times as many users.
C1 [Mixon, Dustin G.; Fickus, Matthew] USAF, Inst Technol, Dept Math & Stat, Wright Patterson AFB, OH 45433 USA.
[Quinn, Christopher J.] Univ Illinois, Dept Elect & Comp Engn, Urbana, IL 61801 USA.
[Kiyavash, Negar] Univ Illinois, Dept Ind & Enterprise Syst Engn, Urbana, IL 61801 USA.
RP Mixon, DG (reprint author), USAF, Inst Technol, Dept Math & Stat, Wright Patterson AFB, OH 45433 USA.
EM dustin.mixon@afit.edu; quinn7@illinois.edu; kiyavash@illi-nois.edu;
matthew.fickus@afit.edu
FU National Science Foundation [DMS 1042701]; Air Force Office of
Scientific Research [F1ATA00083G004, F1ATA00183G003, FA9550-10-1-0345];
Naval Research Laboratory [N00173-09-1-G033]; A. B. Krongard Fellowship;
Department of Energy Computational Science Graduate Fellowship
[DE-FG02-97ER25308]
FX This work was supported in part by the National Science Foundation under
Grant DMS 1042701, in part by the Air Force Office of Scientific
Research under Grants F1ATA00083G004, F1ATA00183G003, and
FA9550-10-1-0345, and in part by the Naval Research Laboratory under
Grant N00173-09-1-G033. D. G. Mixon was supported by the A. B. Krongard
Fellowship. C. J. Quinn was supported by the Department of Energy
Computational Science Graduate Fellowship under Grant DE-FG02-97ER25308.
This paper was presented in part at the 2011 IEEE International
Conference on Acoustics, Speech, and Signal Processing and in part at
the 2011 International Society for Optical Engineers Conference.
NR 49
TC 5
Z9 5
U1 1
U2 19
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9448
J9 IEEE T INFORM THEORY
JI IEEE Trans. Inf. Theory
PD MAR
PY 2013
VL 59
IS 3
BP 1855
EP 1865
DI 10.1109/TIT.2012.2229781
PG 11
WC Computer Science, Information Systems; Engineering, Electrical &
Electronic
SC Computer Science; Engineering
GA 092KQ
UT WOS:000315120400040
ER
PT J
AU Al-Zahery, N
Saunier, J
Ellingson, K
Parson, W
Parsons, TJ
Irwin, JA
AF Al-Zahery, Nadia
Saunier, Jessica
Ellingson, Katharine
Parson, Walther
Parsons, Thomas J.
Irwin, Jodi A.
TI Characterization of mitochondrial DNA control region lineages in Iraq
SO INTERNATIONAL JOURNAL OF LEGAL MEDICINE
LA English
DT Article
DE MtDNA; Variation; Arabs; Kurds; Assyrians; Mandaeans
ID Y-CHROMOSOME; MTDNA
AB To evaluate the utility of mtDNA control region data for the purposes of forensic DNA testing in Iraq, a sample of 182 subjects (128 Arab Muslims, 15 Kurd Muslims, 22 Assyrian Christians and 17 Mandaean Arabs) was tested. High numbers of singleton haplotypes were observed among Arabs, Kurds and Assyrians, but fewer were found in Mandaeans. High molecular diversity and low random match probabilities confirmed the value of control region data in the investigation of maternal genetic lineages among the Iraqi population.
C1 [Al-Zahery, Nadia] Univ Pavia, Dept Biol & Biotechnol L Spallanzani, I-27100 Pavia, Italy.
[Saunier, Jessica; Ellingson, Katharine; Irwin, Jodi A.] Amer Registry Pathol, Rockville, MD USA.
[Saunier, Jessica; Ellingson, Katharine; Parsons, Thomas J.; Irwin, Jodi A.] Dover AFB, Armed Forces DNA Identificat Lab, Dover, DE USA.
[Parson, Walther] Med Univ Innsbruck, Inst Legal Med, A-6020 Innsbruck, Austria.
[Parson, Walther] Penn State Eberly Coll Sci, University Pk, PA USA.
RP Al-Zahery, N (reprint author), Univ Pavia, Dept Biol & Biotechnol L Spallanzani, Via Ferrata 1, I-27100 Pavia, Italy.
EM nadia.alzahery@unipv.it
OI Parson, Walther/0000-0002-5692-2392
FU Institute of International Education; Fondazione Alma Mater Ticinensins;
US National Institute of Justice [2005-DN-R-086]; Austrian Science Fund
FWF [TR L397]; Institute of International Education fellowship
FX We are deeply thankful to all donors who contributed their DNA sample to
this study. We warmly thank Silvana Santachiara-Benerecetti and Ornella
Semino for the helpful discussions and critical reading of the
manuscript. We also thank Melissa Scheible, Kimberly Andreaggi, Toni
Diegoli, Bettina Zimmermann, Gabriela Huber and Alexander Rock for their
help in data generation and data handling, as well as LTC Louis Finelli,
Lanelle Chisolm, James Canik, Brion Smith and the American Registry of
Pathology for their help in making this work possible. The opinions and
assertions contained herein are solely those of the authors and are not
to be construed as official or as views of the US Department of Defense
or the US Department of the Army. This research received support from
the Institute of International Education (to N.A-Z.), Fondazione Alma
Mater Ticinensins, PRIN 2009, FIRB-Futuro in Ricerca 2008 (to O.S.) the
US National Institute of Justice (Interagency agreement 2005-DN-R-086)
and the Austrian Science Fund FWF TR L397. N.A-Z. was supported by
Institute of International Education fellowship.
NR 11
TC 4
Z9 4
U1 1
U2 4
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0937-9827
J9 INT J LEGAL MED
JI Int. J. Legal Med.
PD MAR
PY 2013
VL 127
IS 2
BP 373
EP 375
DI 10.1007/s00414-012-0757-8
PG 3
WC Medicine, Legal
SC Legal Medicine
GA 095KZ
UT WOS:000315334600013
PM 22926116
ER
PT J
AU Jackiewicz, J
Balasubramaniam, KS
AF Jackiewicz, Jason
Balasubramaniam, K. S.
TI SOLAR H alpha OSCILLATIONS FROM INTENSITY AND DOPPLER OBSERVATIONS
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE Sun: atmosphere; Sun: filaments; prominences; Sun: flares; Sun:
oscillations; techniques: image processing
ID 2006 DECEMBER 6; MORETON WAVE; FILAMENT OSCILLATIONS; FLARES; ERUPTION
AB Chromospheric wave activity around flares and filaments has been a research focus for years, and could provide indirect measurements of local conditions that are not otherwise accessible. One interesting observed phenomenon is oscillations in filaments, activated by distant flares and the large-scale waves they produce. Characteristics of these oscillations, such as periods, amplitudes, and lifetimes, can provide unique information about the filament. We measure oscillation properties in flares and filaments from Ha chromospheric data using a new method that provides important spatial and frequency content of the dynamics. We apply the method to two flare events where filaments are observed to oscillate and determine their properties. We find strong oscillatory signal in flaring active regions in the chromosphere over a range of frequencies. Two filaments are found to oscillate without any detectable chromospheric wave acting as an activation mechanism. We find that filaments oscillate with periods of tens of minutes, but variations are significant at small spatial scales along the filamentary region. The results suggest that there is a frequency dependence of the oscillation amplitude, as well as a spatial dependence along single filaments that is more difficult to quantify. It also appears that the strength of the oscillations does not necessarily depend on the strength of the trigger, although there are other possible effects that make this conclusion preliminary. Applications of this technique to other events and different data sets will provide important new insights into the local energy densities and magnetic fields associated with dynamic chromospheric structures.
C1 [Jackiewicz, Jason] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.
[Balasubramaniam, K. S.] USAF, Space Vehicles Directorate, Res Lab, Kirtland AFB, NM 87114 USA.
RP Jackiewicz, J (reprint author), New Mexico State Univ, Dept Astron, POB 30001,MSC 4500, Las Cruces, NM 88003 USA.
EM jasonj@nmsu.edu
FU NSF PAARE award [AST-0849986]
FX We acknowledge fruitful conversations with Stuart Jefferies, Michael
Kirk, Frank Hill, and R. T. James McAteer. This work was supported in
part by an NSF PAARE award AST-0849986.
NR 25
TC 9
Z9 9
U1 0
U2 4
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD MAR 1
PY 2013
VL 765
IS 1
AR 15
DI 10.1088/0004-637X/765/1/15
PG 10
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 090CZ
UT WOS:000314957900015
ER
PT J
AU Lazarus, AM
Pfennig, P
AF Lazarus, A. M.
Pfennig, P.
TI The Use of Concurrent Chart Review and Its Impact on Surgical Care
Improvement Project Core Measures on Inpatient Medical/Surgical Wards
SO CLINICAL NURSE SPECIALIST
LA English
DT Meeting Abstract
C1 [Lazarus, A. M.; Pfennig, P.] USAF, San Antonio, TX USA.
NR 0
TC 0
Z9 0
U1 0
U2 1
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0887-6274
J9 CLIN NURSE SPEC
JI Clin. Nurse Spec.
PD MAR-APR
PY 2013
VL 27
IS 2
BP E54
EP E54
PG 1
WC Nursing
SC Nursing
GA 088YK
UT WOS:000314873600138
ER
PT J
AU Perry, VL
Ellis, KW
AF Perry, V. L.
Ellis, K. W.
TI Implementing a Facility-Wide Program for Feeding Tube Placement
Reassessment
SO CLINICAL NURSE SPECIALIST
LA English
DT Meeting Abstract
C1 [Perry, V. L.; Ellis, K. W.] USAF, San Antonio, TX USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0887-6274
J9 CLIN NURSE SPEC
JI Clin. Nurse Spec.
PD MAR-APR
PY 2013
VL 27
IS 2
BP E19
EP E19
PG 1
WC Nursing
SC Nursing
GA 088YK
UT WOS:000314873600048
ER
PT J
AU Perry, VL
Franks, M
Rasool, K
AF Perry, V. L.
Franks, M.
Rasool, K.
TI A Daily Goals Tool to Facilitate Indirect Nurse-Physician Communication
During Morning Rounds on a Medical-Surgical Unit
SO CLINICAL NURSE SPECIALIST
LA English
DT Meeting Abstract
C1 [Perry, V. L.; Franks, M.; Rasool, K.] USAF, San Antonio, TX USA.
NR 0
TC 0
Z9 0
U1 1
U2 4
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0887-6274
J9 CLIN NURSE SPEC
JI Clin. Nurse Spec.
PD MAR-APR
PY 2013
VL 27
IS 2
BP E18
EP E18
PG 1
WC Nursing
SC Nursing
GA 088YK
UT WOS:000314873600045
ER
PT J
AU Tubera, D
Savell, K
AF Tubera, D.
Savell, K.
TI Burn Care Program: Building Clinical Competency for Air Force Critical
Care/Emergency Nursing Fellows
SO CLINICAL NURSE SPECIALIST
LA English
DT Meeting Abstract
C1 [Tubera, D.] USA, Inst Surg Res, San Antonio, TX USA.
[Savell, K.] USAF, Lackland AFB, TX USA.
NR 0
TC 0
Z9 0
U1 0
U2 1
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0887-6274
J9 CLIN NURSE SPEC
JI Clin. Nurse Spec.
PD MAR-APR
PY 2013
VL 27
IS 2
BP E5
EP E6
PG 2
WC Nursing
SC Nursing
GA 088YK
UT WOS:000314873600014
ER
PT J
AU Knopp, JS
Grandhi, R
Aldrin, JC
Park, I
AF Knopp, Jeremy S.
Grandhi, Ramana
Aldrin, John C.
Park, Inseok
TI Statistical Analysis of Eddy Current Data from Fastener Site Inspections
SO JOURNAL OF NONDESTRUCTIVE EVALUATION
LA English
DT Article
DE Probability of detection; Eddy current; Fastener site inspection;
Bootstrap confidence intervals; Box-Cox transformation
ID PROBABILITY
AB Recent work on reliably detecting and characterizing cracks in multi-layer airframe structures has used modeling and simulation to extract features from raw eddy current data, and to assist in the evaluation of probability of detection (POD). This paper focuses on the statistical analysis of the data from these studies. Hit/miss, linear, and physics-inspired methods are employed to evaluate POD. The Box-Cox transformation is used as a remedy for violations of the constant variance assumption. In addition, a bootstrapping method is introduced for confidence bound calculation on a 2nd order linear model. The objective of this work is to provide on insight how different models and assumptions impact POD evaluation.
C1 [Knopp, Jeremy S.] USAF, Res Lab, RXLP, Wright Patterson AFB, OH 45433 USA.
[Grandhi, Ramana; Park, Inseok] Wright State Univ, Dayton, OH 45435 USA.
[Aldrin, John C.] Computat Tools, Gurnee, IL 60031 USA.
RP Knopp, JS (reprint author), USAF, Res Lab, RXLP, Wright Patterson AFB, OH 45433 USA.
EM jeremy.knopp@wpafb.af.mil
NR 18
TC 3
Z9 3
U1 1
U2 6
PU SPRINGER/PLENUM PUBLISHERS
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0195-9298
J9 J NONDESTRUCT EVAL
JI J. Nondestruct. Eval.
PD MAR
PY 2013
VL 32
IS 1
BP 44
EP 50
DI 10.1007/s10921-012-0157-5
PG 7
WC Materials Science, Characterization & Testing
SC Materials Science
GA 091JN
UT WOS:000315045700005
ER
PT J
AU Kirk, MS
Balasubramaniam, KS
Jackiewicz, J
McNamara, BJ
McAteer, RTJ
AF Kirk, M. S.
Balasubramaniam, K. S.
Jackiewicz, J.
McNamara, B. J.
McAteer, R. T. J.
TI An Automated Algorithm to Distinguish and Characterize Solar Flares and
Associated Sequential Chromospheric Brightenings
SO SOLAR PHYSICS
LA English
DT Article
DE Chromosphere, active; Flares, dynamics
AB We present a new automated algorithm to identify, track, and characterize small-scale brightening associated with solar eruptive phenomena observed in H alpha. The temporal, spatially localized changes in chromospheric intensities can be separated into two categories: flare ribbons and sequential chromospheric brightenings (SCBs). Within each category of brightening we determine the smallest resolvable locus of pixels, a kernel, and track the temporal evolution of the position and intensity of each kernel. This tracking is accomplished by isolating the eruptive features, identifying kernels, and linking detections between frames into trajectories of kernels. We fully characterize the evolving intensity and morphology of the flare ribbons by observing the tracked flare kernels in aggregate. With the location of SCB and flare kernels identified, they can easily be overlaid on complementary data sets to extract Doppler velocities and magnetic-field intensities underlying the kernels. This algorithm is adaptable to any dataset to identify and track solar features.
C1 [Kirk, M. S.; Balasubramaniam, K. S.; Jackiewicz, J.; McNamara, B. J.; McAteer, R. T. J.] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.
[Kirk, M. S.; Balasubramaniam, K. S.] USAF, Space Vehicles Directorate, Res Lab, Sunspot, NM 88349 USA.
[Kirk, M. S.; Balasubramaniam, K. S.] Natl Solar Observ, Sunspot, NM 88349 USA.
RP Kirk, MS (reprint author), New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.
EM mskirk@nmsu.edu; jasonj@nmsu.edu; bmcnamar@nmsu.edu; mcateer@nmsu.edu
FU Air Force Office of Scientific Research; New Mexico Space Grant
Consortium
FX The authors thank: i) USAF/AFRL Space Scholar Program, ii) NSO/AURA for
the use of their Sunspot, NM facilities, iii) AFRL/RVBXS, iv) Crocker
and Weeks for making their algorithm available online, and v) NMSU. This
project was supported by grants from the Air Force Office of Scientific
Research and New Mexico Space Grant Consortium.
NR 12
TC 3
Z9 3
U1 0
U2 2
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0038-0938
J9 SOL PHYS
JI Sol. Phys.
PD MAR
PY 2013
VL 283
IS 1
BP 97
EP 111
DI 10.1007/s11207-011-9843-1
PG 15
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 090NB
UT WOS:000314984700007
ER
PT J
AU Dodson, JC
Inman, DJ
AF Dodson, J. C.
Inman, D. J.
TI Thermal sensitivity of Lamb waves for structural health monitoring
applications
SO ULTRASONICS
LA English
DT Article
DE Structural health monitoring; Guided waves; Lamb waves; Thermal
variation
ID ULTRASONIC GUIDED-WAVES; TEMPERATURE STABILITY; SYSTEMS; PROPAGATION;
SENSORS; CRACK
AB One of the drawbacks of the current Lamb wave structural health monitoring methods are the false positives due to changing environmental conditions such as temperature. To create an environmental insensitive damage detection scheme, the physics of thermal effects on Lamb waves must be understood. Dispersion and thermal sensitivity curves for an isotropic plate with thermal stress and thermally varying elastic modulus are presented. The thermal sensitivity of dispersion curves is analytically developed and validated by experimental measurements. The group velocity thermal sensitivity highlights temperature insensitive features at two critical frequencies. The thermal sensitivity gives us insight to how temperature affects Lamb wave speeds in different frequency ranges and will help those developing structural health monitoring algorithms. Published by Elsevier B.V.
C1 [Dodson, J. C.] USAF, Res Lab, Munit Directorate, Fuzes Branch, Eglin AFB, FL 32542 USA.
[Inman, D. J.] Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA.
RP Dodson, JC (reprint author), USAF, Res Lab, Munit Directorate, Fuzes Branch, 306 W Eglin Blvd,Bldg 432, Eglin AFB, FL 32542 USA.
EM jacob.dodson@eglin.af.mil
FU Department of Defense Science, Mathematics, And Research for
Transformation (SMART) Scholarship for Service program; AFOSR
[FA9550-09-1-0686]
FX J. Dodson would like the acknowledge support from the Department of
Defense Science, Mathematics, And Research for Transformation (SMART)
Scholarship for Service program. All research was conducted at the
Center for Intelligent Material Systems and Structures located at
Virginia Polytechnic Institute and State University while J. Dodson was
pursing his graduate degree. The authors also gratefully acknowledge the
support of AFOSR Grant No. FA9550-09-1-0686 under the guidance of Dr.
David Stargel.
NR 35
TC 23
Z9 24
U1 1
U2 24
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0041-624X
J9 ULTRASONICS
JI Ultrasonics
PD MAR
PY 2013
VL 53
IS 3
BP 677
EP 685
DI 10.1016/j.ultras.2012.10.007
PG 9
WC Acoustics; Radiology, Nuclear Medicine & Medical Imaging
SC Acoustics; Radiology, Nuclear Medicine & Medical Imaging
GA 088YD
UT WOS:000314872900008
PM 23200276
ER
PT J
AU Do, H
Carter, C
AF Do, Hyungrok
Carter, Campbell
TI Hydrocarbon fuel concentration measurement in reacting flows using
short-gated emission spectra of laser induced plasma
SO COMBUSTION AND FLAME
LA English
DT Article
DE Short-gated LIBS; Fuel concentration measurement; Plasma Emission;
Laser-induced breakdown; Emission Spectroscopy
ID INDUCED BREAKDOWN SPECTROSCOPY; SUPERSONIC-FLOW; COMBUSTION; FLAMES;
AIR; MOLECULES; IGNITION; METHANE; SPARK; JET
AB Laser Induced Breakdown Spectroscopy (LIBS) is used to measure hydrocarbon fuel concentration in reacting flows. Emission spectra of the plasma induced by a focused-laser beam (Nd:YAG laser at 532 nm) are correlated with hydrocarbon fuel concentration in regions upstream (reactants) and downstream (combustion products) of a flame and adjacent to the combustion reaction zone. Nitrogen (568 nm) and hydrogen (656 nm) atomic emission lines are selected to establish a correlation between the line intensities and fuel concentration. These correlations are effective in a wide range of fuel mole fraction (7-90% methane/air and 5-93% ethylene/air mixtures) and independent of flow velocity. Nevertheless, the correlation depends on gas species in the plasma. Three individual correlations for premixed methane/air, ethylene/air and combustion product gases are established. For the application of the LIBS in high-speed flows, the emission spectrum is captured employing a 10-ns time gate approximately 25 ns after initial emission of radiation (from the probe region). The 25-ns gate delay is chosen to avoid broadband thermal emission from the high-temperature plasma core and achieve high spectrum signal intensity with reasonable signal-to-noise ratio of the atomic emission lines. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
C1 [Do, Hyungrok] Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 USA.
[Carter, Campbell] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Do, H (reprint author), 109 Hessert Lab, Notre Dame, IN 46556 USA.
EM hdo3@nd.edu
FU American Society for Engineering Education; Air Force Research
Laboratory (AFRL at Wright Patterson Air Force Base); Air Force Office
of Scientific Research (AFOSR)
FX This work is supported by American Society for Engineering Education
(ASEE Summer Faculty Fellowship Program), Air Force Research Laboratory
(AFRL at Wright Patterson Air Force Base) and Air Force Office of
Scientific Research (AFOSR, Program Manager: Dr. Chiping Li).
NR 36
TC 10
Z9 10
U1 2
U2 58
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0010-2180
J9 COMBUST FLAME
JI Combust. Flame
PD MAR
PY 2013
VL 160
IS 3
BP 601
EP 609
DI 10.1016/j.combustflame.2012.12.002
PG 9
WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary;
Engineering, Chemical; Engineering, Mechanical
SC Thermodynamics; Energy & Fuels; Engineering
GA 086EO
UT WOS:000314666900011
ER
PT J
AU Pacley, S
Mitchel, WC
Murray, PT
Anderson, D
Smith, HE
Beck-Millerton, E
Voevodin, AA
AF Pacley, S.
Mitchel, W. C.
Murray, P. T.
Anderson, D.
Smith, H. E.
Beck-Millerton, E.
Voevodin, A. A.
TI The Role of the Nickel Catalyst and Its Chemical and Structural
Evolution During Carbon Nanopearl Growth
SO JOURNAL OF ELECTRONIC MATERIALS
LA English
DT Article
DE Carbon nanopearls; nickel; catalyst; chemical vapor deposition
ID NANOSPHERES; SPHERES; NANOPARTICLES
AB The role of the nickel catalyst size and its chemical and structural evolution during the early stages of carbon nanopearl nucleation and growth, by chemical vapor deposition from acetylene/argon mixture, were investigated and correlated with the resulting nanopearls' morphological and structural properties. Carbon nanopearls were grown using Ni nanoparticles that were 20 nm and 100 nm in size, at a growth temperature of 850A degrees C, for the following growth times: 10 s, 30 s, 60 s, 90 s, 120 s, and 300 s. x-Ray diffraction, x-ray photoelectron spectroscopy, Raman spectroscopy, and transmission electron microscopy were performed on the carbon nanopearl samples. The x-ray diffraction and x-ray photoelectron spectra showed that the following chemical constituents were present during the growth of carbon nanopearls: NiO, Ni2O3, Ni3C, Ni, CO, and C (both amorphous and graphite). Transmission electron microscopy showed an increase in carbon nanopearl size with larger Ni nanoparticles. Raman results concluded that the smaller catalyst resulted in a more crystalline graphitic structure. Finally, the results showed that the 20 nm Ni nanoparticles chemically reacted sooner than the 100 nm Ni nanoparticles.
C1 [Pacley, S.; Mitchel, W. C.; Beck-Millerton, E.; Voevodin, A. A.] USAF, Res Lab AFRL Wright Patterson AFB, Wright Patterson AFB, OH 45433 USA.
[Murray, P. T.; Anderson, D.; Smith, H. E.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
RP Pacley, S (reprint author), USAF, Res Lab AFRL Wright Patterson AFB, Wright Patterson AFB, OH 45433 USA.
EM Shanee.Pacley@wpafb.af.mil
RI Voevodin, Andrey/I-6684-2013
FU Materials and Manufacturing Directorate for the Air Force Research
Laboratory
FX This research was supported by the Materials and Manufacturing
Directorate for the Air Force Research Laboratory.
NR 16
TC 0
Z9 0
U1 2
U2 38
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0361-5235
J9 J ELECTRON MATER
JI J. Electron. Mater.
PD MAR
PY 2013
VL 42
IS 3
BP 417
EP 425
DI 10.1007/s11664-012-2367-0
PG 9
WC Engineering, Electrical & Electronic; Materials Science,
Multidisciplinary; Physics, Applied
SC Engineering; Materials Science; Physics
GA 084HL
UT WOS:000314529300010
ER
PT J
AU Aga, RS
Telek, BA
Lombardi, J
Heckman, EM
Bartsch, CM
AF Aga, Roberto S., Jr.
Telek, Brian A.
Lombardi, Jack P., III
Heckman, Emily M.
Bartsch, Carrie M.
TI Dielectric Tunability of DNA Biopolymer Films with Varying Amounts of
Hexadecyltrimethylammonium Chloride
SO JOURNAL OF ELECTRONIC MATERIALS
LA English
DT Article
DE DNA biopolymer; varactor; dielectric tunability; microwave
AB Deoxyribonucleic acid (DNA) biopolymer films are fabricated with varying amounts of hexadecyltrimethylammonium chloride (CTMA), which is a surfactant necessary to produce a DNA complex that is soluble in organic solvents. The dielectric constant (kappa) of these films at microwave frequencies as a function of applied static electric field (E (DC)) is investigated. Results show that the dependence of kappa on E (DC), which is referred to as the dielectric tunability, is influenced by the amount of CTMA in the complex. Dielectric tunability is suppressed when the amount of CTMA is insufficient and improved when more CTMA is added. However, excessive amounts of CTMA also result in a very rough film surface that causes shorting problems when used in a capacitive structure. A varactor employing a 1-mu m-thick DNA biopolymer film as the dielectric is demonstrated. Under 5 V DC bias, which generates E (DC) = 5 V/mu m, its capacitance at 15 GHz changes by 0.04 pF. This change corresponds to a relative dielectric tunability of 6.6%. A simple application of this varactor for modulation of the power transmitted through a microwave transmission line is also demonstrated.
C1 [Aga, Roberto S., Jr.] Gen Dynam Informat Technol, Dayton, OH 45431 USA.
[Aga, Roberto S., Jr.; Lombardi, Jack P., III; Heckman, Emily M.; Bartsch, Carrie M.] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Telek, Brian A.] Univ Dayton, Dept Chem, Dayton, OH 45469 USA.
RP Aga, RS (reprint author), Gen Dynam Informat Technol, Dayton, OH 45431 USA.
EM Roberto.Aga.ctr@wpafb.af.mil
NR 17
TC 0
Z9 0
U1 1
U2 8
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0361-5235
EI 1543-186X
J9 J ELECTRON MATER
JI J. Electron. Mater.
PD MAR
PY 2013
VL 42
IS 3
BP 463
EP 469
DI 10.1007/s11664-012-2347-4
PG 7
WC Engineering, Electrical & Electronic; Materials Science,
Multidisciplinary; Physics, Applied
SC Engineering; Materials Science; Physics
GA 084HL
UT WOS:000314529300016
ER
PT J
AU Sabat, JW
Palazotto, AN
AF Sabat, Joseph W.
Palazotto, Anthony N.
TI Structural performance of composite material for a slotted waveguide
antenna stiffened structure under compression
SO COMPOSITE STRUCTURES
LA English
DT Article
DE Instability; Nonlinear; Wave guide
AB The Slotted Waveguide Antenna Stiffened Structure (SWASS) is an aircraft system that can provide the capabilities of a stiffened panel skin structure and a slotted waveguide radar antenna simultaneously. The system is designed for integration into the fuselage or wing sections of intelligence, surveillance, and reconnaissance (ISR) aircraft and would increase the system performance through the availability of increased area and decreased system weight. Elemental parts of the SWASS structure were tested in compression after preliminary testing was completed for material characterization. Testing included finite element stress and strain field characterization of seven single slot configurations, and results showed the longitudinal 90 degrees slot was the best structural slot by about 30% in terms of maximum von Mises stress. Single waveguides were tested in the non-slotted configuration and a configuration including a five longitudinal slot array in one waveguide wall. The slot array, compared with the unslotted configuration, was determined to have a decrease in nonlinear limit load of 8% using the finite element simulations and 14% using the experimental results and showed good comparisons overall. All waveguides showed the characteristics of local wall buckling with no overall beam buckling. Published by Elsevier Ltd.
C1 [Palazotto, Anthony N.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Palazotto, AN (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM anthony.palazotto@afit.edu
FU Advanced Structures Division of the Air Vehicles Directorate of the Air
Force Research Labs
FX The authors would like to acknowledge the Advanced Structures Division
of the Air Vehicles Directorate of the Air Force Research Labs for their
support and guidance in this project. Jim Tuss, Bill Baron, and many
others provided financial support, concept guidance, and endless help
during the project. Their efforts were crucial to the completion of the
research.
NR 10
TC 3
Z9 3
U1 1
U2 13
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0263-8223
J9 COMPOS STRUCT
JI Compos. Struct.
PD MAR
PY 2013
VL 97
BP 202
EP 210
DI 10.1016/j.compstruct.2012.09.057
PG 9
WC Materials Science, Composites
SC Materials Science
GA 077BM
UT WOS:000314002900019
ER
PT J
AU Ryan, ET
Jacques, DR
Colombi, JM
AF Ryan, Erin T.
Jacques, David R.
Colombi, John M.
TI An ontological framework for clarifying flexibility-related terminology
via literature survey
SO SYSTEMS ENGINEERING
LA English
DT Article
DE flexibility; adaptability; robustness; agility; versatility; ontology;
definitions
ID PRODUCT DEVELOPMENT; SYSTEM-DESIGN; ADAPTABILITY; ROBUSTNESS
AB Despite its ubiquity in the systems engineering literature, flexibility remains an ambiguous concept. There exist a multitude of definitions, which vary not only by domain, but within domains as well. Furthermore, these definitions often conflict with one another, making it difficult to discern the intended meaning in a given study or to form generalizations across studies. Complicating matters, there is a plethora of related terminology that is often used carelessly and/or inter-changeably with flexibility. In this paper, we employ a novel ontological framework for clarifying salient aspects of extant flexibility-related terminology. While it was not possible to distill consensus definitions from the literature, we did identify certain dominant characteristics that enabled us to formulate a set of democratic definitions for flexibility, adaptability, and robustness, as well as recommended definitions for agility and versatility. We believe that the proposed definitions of these key system design principles may provide a baseline for improving analysis and communication among systems engineering practitioners and academics. (C) 2012 Wiley Periodicals, Inc. Syst Eng 16:
C1 [Ryan, Erin T.; Jacques, David R.; Colombi, John M.] USAF, Dept Syst Engn & Management, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Ryan, ET (reprint author), USAF, Dept Syst Engn & Management, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM erin.ryan@afit.edu; david.jacques@afit.edu; john.colombi@afit.edu
NR 43
TC 11
Z9 11
U1 0
U2 6
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 1098-1241
EI 1520-6858
J9 SYSTEMS ENG
JI Syst. Eng.
PD SPR
PY 2013
VL 16
IS 1
BP 99
EP 110
DI 10.1002/sys.21222
PG 12
WC Engineering, Industrial; Operations Research & Management Science
SC Engineering; Operations Research & Management Science
GA 076VT
UT WOS:000313987700007
ER
PT J
AU Mckinley, RA
Tripp, LD
Fullerton, KL
Goodyear, C
AF Mckinley, R. Andrew
Tripp, Lloyd D., Jr.
Fullerton, Kathy L.
Goodyear, Chuck
TI Sustained Acceleration on Perception of Relative Position and Motion
SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE
LA English
DT Article
DE acceleration; high G; relative motion; cognitive performance
ID VISUAL AREA; PATHWAYS; SEPARATE; DIRECTION; NEURONS
AB Introduction: Air-to-air refueling, formation flying, and projectile countermeasures all rely on a pilot's ability to be aware of his position and motion relative to another object. Methods: Eight subjects participated in the study, all members of the sustained acceleration stress panel at Wright-Patterson AFB, OH. The task consisted of the subject performing a two-dimensional join up task between a KC-135 tanker and an F-16. The objective was to guide the nose of the F-16 to the posterior end of the boom extended from the tanker, and hold this position for 2 s. If the F-16 went past the tanker, or misaligned with the tanker, it would be recorded as an error. These tasks were performed during four G, acceleration profiles starting from a baseline acceleration of 1.5 G(z). The plateaus were 3, 5, and 7 G. The final acceleration exposure was a simulated aerial combat maneuver (SACM). Results: One subject was an outlier and therefore omitted from analysis. The mean capture time and percent error data were recorded and compared separately. There was a significant difference in error percentage change from baseline among the Gz profiles, but not capture time. Mean errors were approximately 15% higher in the 7 G profile and 10% higher during the SACM. Discussion: This experiment suggests that the ability to accurately perceive the motion of objects relative to other objects is impeded at acceleration levels of 7 G, or higher.
C1 [Mckinley, R. Andrew; Tripp, Lloyd D., Jr.; Fullerton, Kathy L.; Goodyear, Chuck] Air Force Res Lab, Appl Neurosci Branch, Wright Patterson AFB, OH USA.
RP Mckinley, RA (reprint author), 2510 Fifth St,Bldg 840, Wright Patterson AFB, OH 45433 USA.
EM mckkinley@wpafb.af.mil
NR 13
TC 0
Z9 0
U1 0
U2 4
PU AEROSPACE MEDICAL ASSOC
PI ALEXANDRIA
PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 USA
SN 0095-6562
EI 1943-4448
J9 AVIAT SPACE ENVIR MD
JI Aviat. Space Environ. Med.
PD MAR
PY 2013
VL 84
IS 3
BP 184
EP 189
DI 10.3357/ASEM.3369.2013
PG 6
WC Public, Environmental & Occupational Health; Medicine, General &
Internal; Sport Sciences
SC Public, Environmental & Occupational Health; General & Internal
Medicine; Sport Sciences
GA AD1LP
UT WOS:000332995800002
PM 23513278
ER
PT J
AU Vernon, JP
Serak, SV
Hakobyan, RS
Tondiglia, VP
White, TJ
Tabiryan, NV
Bunning, TJ
AF Vernon, Jonathan P.
Serak, Svetlana V.
Hakobyan, Rafael S.
Tondiglia, Vincent P.
White, Timothy J.
Tabiryan, Nelson V.
Bunning, Timothy J.
TI Generation of Light Scattering States in Cholesteric Liquid Crystals by
Optically Controlled Boundary Conditions
SO CRYSTALS
LA English
DT Article
DE photoisomerization; azobenzene; liquid crystal; patterning; texture;
stimuli-responsive materials; photoalignment; switchable photonic
bandgaps; displays
AB Circularly polarized light was previously employed to stimulate the reversible and reconfigurable writing of scattering states in cholesteric liquid crystal (CLC) cells constructed with a photosensitive layer. Such dynamic photodriven responses have utility in remotely triggering changes in optical constructs responsive to optical stimulus and applications where complex spatial patterning is required. Writing of scattering regions required the handedness of incoming radiation to match the handedness of the CLC and the reflection bandwidth of the CLC to envelop the wavelength of the incoming radiation. In this paper, the mechanism of transforming the CLC into a light scattering state via the influence of light on the photosensitive alignment layer is detailed. Specifically, the effects of: (i) the polarization state of light on the photosensitive alignment layer; (ii) the exposure time; and (iii) the incidence angle of radiation on domain formation are reported. The photogenerated light-scattering domains are shown to be similar in appearance between crossed polarizers to a defect structure that occurs at a CLC/air interface (i.e., a free CLC surface). This observation provides strong indication that exposure of the photosensitive alignment layer to the circularly polarized light of appropriate wavelength and handedness generates an out-of-plane orientation leading to a periodic distortion of the original planar structure.
C1 [Vernon, Jonathan P.; Tondiglia, Vincent P.; White, Timothy J.; Bunning, Timothy J.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Serak, Svetlana V.; Hakobyan, Rafael S.; Tabiryan, Nelson V.] Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
[Tondiglia, Vincent P.] SAIC Inc, Dayton, OH 45431 USA.
RP Bunning, TJ (reprint author), Air Force Res Lab, 3005 Hobson Way,Suite 1, Wright Patterson AFB, OH 45433 USA.
EM jonathan.vernon@wpafb.af.mil; svetlana@beamco.com; rhakob@beamco.com;
vincent.tondiglia.ctr@wpafb.af.mil; timothy.white2@wpafb.af.mil;
nelson@beamco.com; timothy.bunning@wpafb.af.mil
FU Air Force Office of Scientific Research; Materials and Manufacturing
Directorate of the Air Force Research Laboratory
FX This work was funded by the Air Force Office of Scientific Research and
the Materials and Manufacturing Directorate of the Air Force Research
Laboratory. The authors are thankful to Deng-Ke Yang and Michael E.
McConney for helpful discussions.
NR 37
TC 2
Z9 2
U1 1
U2 10
PU MDPI AG
PI BASEL
PA POSTFACH, CH-4005 BASEL, SWITZERLAND
SN 2073-4352
J9 CRYSTALS
JI Crystals
PD MAR
PY 2013
VL 3
IS 1
BP 234
EP 247
DI 10.3390/cryst3010234
PG 14
WC Crystallography; Materials Science, Multidisciplinary
SC Crystallography; Materials Science
GA V38KF
UT WOS:000209341600013
ER
PT J
AU Hardman, N
Jacques, D
Colombi, J
Hill, RR
Miller, J
AF Hardman, Nicholas
Jacques, David
Colombi, John
Hill, Raymond R.
Miller, Janet
TI Requirements Elicitation Through Legacy Mishap Analysis
SO JOURNAL OF AEROSPACE INFORMATION SYSTEMS
LA English
DT Article
ID COMMERCIAL AVIATION ACCIDENTS; HUMAN ERROR; CLASSIFICATION-SYSTEM; PILOT
ERROR; HFACS
AB The archives of mishap-investigation reports provide a large database of documented system failures. A method is presented that studies human error in these mishaps and quantitatively predicts focus areas for new system development. Even very novel systems have similarities, either in structure or operation, to legacy systems. Knowing what design-induced errors have plagued past human-machine interactions can guide new system requirements generation. This method is demonstrated through its application for a next-generation military unmanned aerial system. For this, the last five years of U.S. Air Force aircraft mishaps are studied using the human factors analysis and classification system and mapped to the domains of human systems integration.
C1 [Hardman, Nicholas] US Air Force Acad, Div Engn, Syst Engn Program, Colorado Springs, CO 80840 USA.
[Jacques, David; Colombi, John; Hill, Raymond R.] US Air Force Inst Technol, Grad Sch Engn & Management, Dayton, OH 45433 USA.
[Jacques, David; Colombi, John] US Air Force Acad, Colorado Springs, CO 80840 USA.
[Miller, Janet] Human Effectiveness Div, Wright Patterson AFB, OH 45433 USA.
RP Hardman, N (reprint author), US Air Force Acad, Div Engn, Syst Engn Program, Colorado Springs, CO 80840 USA.
EM nicholas.hardman@usafa.edu
FU 711th Human Performance Wing, U.S. Air Force
FX This work was supported in part by the 711th Human Performance Wing,
U.S. Air Force. The views expressed in this paper are those of the
authors and do not reflect the official policy or position of the U.S.
Air Force
NR 32
TC 0
Z9 0
U1 1
U2 6
PU AMER INST AERONAUTICS ASTRONAUTICS
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 1940-3151
EI 2327-3097
J9 J AEROSP INFORM SYST
JI J. Aerosp. Inf. Syst.
PD MAR
PY 2013
VL 10
IS 3
BP 105
EP 113
DI 10.2514/1.47879
PG 9
WC Engineering, Aerospace
SC Engineering
GA AB2FK
UT WOS:000331608400001
ER
PT J
AU Vera, GA
Ardalan, S
Yao, XY
Avery, K
AF Vera, G. Alonzo
Ardalan, Sasan
Yao, Xiaoyin
Avery, Keith
TI Fast Local Scrubbing for Field-Programmable Gate Array's Configuration
Memory
SO JOURNAL OF AEROSPACE INFORMATION SYSTEMS
LA English
DT Article
AB Memory scrubbing is used to mitigate single event upsets on susceptible devices. In the case of field-programmable gate arrays, configuration memory scrubbing is generally used in conjunction with triple modular redundancy to increase reliability in spaceborne applications. Current solutions require a subsystem able to read and write from the configuration memory and retrieve a safely stored golden bitstream for scrubbing whenever an error is detected. An alternative to this solution is to implement error detection and correction codes. These codes usually require redundant information to be embedded within the data that are being protected. This is particularly difficult in the case of a configuration bitstream, which is automatically created by CAD tools. In this paper, we present an alternative error correction and detection solution that overcomes such difficulties and allows fast, local scrubbing without the need to store a golden bitstream somewhere safe. This solution is a processing peripheral tied to a scrubber, labeled Femto, currently implemented in a radiation-hardened by design structured application-specific integrated circuit.
C1 [Vera, G. Alonzo] Univ New Mexico, Albuquerque, NM 87106 USA.
[Ardalan, Sasan; Yao, Xiaoyin] Microelect Res & Dev Corp, Albuquerque, NM 87112 USA.
[Avery, Keith] US Air Force Res Lab, Space Vehicles Directorate, Albuquerque, NM 87117 USA.
RP Vera, GA (reprint author), Univ New Mexico, Albuquerque, NM 87106 USA.
FU U.S. Air Force Research Laboratory [FA9453-09-C-0172]
FX The project described in this paper has been funded by the U.S. Air
Force Research Laboratory under grant FA9453-09-C-0172.
NR 21
TC 1
Z9 1
U1 0
U2 0
PU AMER INST AERONAUTICS ASTRONAUTICS
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 1940-3151
EI 2327-3097
J9 J AEROSP INFORM SYST
JI J. Aerosp. Inf. Syst.
PD MAR
PY 2013
VL 10
IS 3
BP 144
EP 153
DI 10.2514/1.54972
PG 10
WC Engineering, Aerospace
SC Engineering
GA AB2FK
UT WOS:000331608400004
ER
PT J
AU Pruett, BD
AF Pruett, Billy D.
TI Dichlorodiphenyltrichloroethane (DDT): A Weapon Missing From the US
Department of Defense's Vector Control Arsenal
SO MILITARY MEDICINE
LA English
DT Article
C1 US Air Force, Sch Aerosp Med, Aerosp Med Dept FEEG, Wright Patterson AFB, OH 45433 USA.
RP Pruett, BD (reprint author), US Air Force, Sch Aerosp Med, Aerosp Med Dept FEEG, 2510 Fifth St, Wright Patterson AFB, OH 45433 USA.
NR 8
TC 0
Z9 0
U1 1
U2 4
PU ASSOC MILITARY SURG US
PI BETHESDA
PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 USA
SN 0026-4075
EI 1930-613X
J9 MIL MED
JI Milit. Med.
PD MAR
PY 2013
VL 178
IS 3
BP 243
EP 245
DI 10.7205/MILMED-D-12-00305
PG 3
WC Medicine, General & Internal
SC General & Internal Medicine
GA AN7TX
UT WOS:000340805000002
PM 23707108
ER
PT J
AU Aaron, CL
Fotinos, MJ
West, KB
Goodwin, DJ
Mancuso, JD
AF Aaron, Christopher L.
Fotinos, Meletios J.
West, Kevin B.
Goodwin, Donald J.
Mancuso, James D.
TI Tuberculosis Among Nonimmigrant Visitors to US Military Installations
SO MILITARY MEDICINE
LA English
DT Article
ID FOREIGN-BORN PERSONS; UNITED-STATES
AB Background: Nonimmigrant visitors are not required to be evaluated for tuberculosis (TB) before entering the country. Little literature exists describing the challenges of TB control among this demographic. This report reviews the challenges in managing TB in this population on U.S. military installations. Methods: Six cases were identified from reportable medical event reports. Information was obtained from public health personnel via phone interviews. Verified cases from 2004 to 2011 were included. Results: Challenges were congruent among locations including: lack of procedures to screen for infection and disease among individuals at time of entry allowing one case to be admitted with acquired immunodeficiency syndrome and another concurrently on treatment for active TB; delays in the diagnosis of active TB as median time from entry to diagnosis was 62 days; and the need to conduct an effective contact investigation as the mean contact index was 77 including 1 secondary case of active TB. Conclusions: These cases emphasize the, need for screening for TB in visitors from high-risk countries at time of entry, prompt diagnosis and treatment if found, procedures for evaluation of contacts, and interjurisdictional cooperation in large contact investigations. These challenges are common to nonimmigrants in both military and civilian settings.
C1 [Aaron, Christopher L.] Walter Reed Army Inst Res, Prevent Med Branch, Silver Spring, MD 20910 USA.
[Fotinos, Meletios J.] Global Hlth Engagement Branch AFMSA SGXI, Lackland AFB, TX 78236 USA.
[West, Kevin B.] Wilford Hall USAF Med Ctr, Reid Clin, Lackland AFB, TX 78236 USA.
[Goodwin, Donald J.] USAF Sch Aerosp Med, Wright Patterson AFB, OH 45433 USA.
[Mancuso, James D.] Walter Reed Army Inst Res, Prevent Med Branch, Silver Spring, MD 20910 USA.
RP Aaron, CL (reprint author), Walter Reed Army Inst Res, Prevent Med Branch, 2460 Linden Lane,Bldg 509,Off 110, Silver Spring, MD 20910 USA.
FU Preventive Medicine Residency [11]; Walter Reed Army Institute of
Research, Silver Spring, Maryland
FX This study was funded by Preventive Medicine Residency, Program 11,
Walter Reed Army Institute of Research, Silver Spring, Maryland.
NR 13
TC 2
Z9 2
U1 0
U2 1
PU ASSOC MILITARY SURG US
PI BETHESDA
PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 USA
SN 0026-4075
EI 1930-613X
J9 MIL MED
JI Milit. Med.
PD MAR
PY 2013
VL 178
IS 3
BP 346
EP 352
DI 10.7205/MILMED-D-12-00297
PG 7
WC Medicine, General & Internal
SC General & Internal Medicine
GA AN7TX
UT WOS:000340805000018
PM 23707124
ER
PT J
AU Pilchak, AL
AF Pilchak, Adam L.
TI Fatigue crack growth rates in alpha titanium: Faceted vs. striation
growth
SO SCRIPTA MATERIALIA
LA English
DT Article
DE Titanium; Fatigue; Fractography; Crack growth; Dwell
ID LOADING WAVE-FORM; ALLOY; MICROSTRUCTURE; FRACTURE; CRYSTALLOGRAPHY;
FRACTOGRAPHY; PROPAGATION; TEXTURE; TIME
AB Cyclic and dwell fatigue crack growth (FCG) rates were measured in single-phase Ti-7Al (wt.%) directly from fractured samples. A quantitative method using stereo pairs was used to eliminate the uncertainty associated with these measurements on two-dimensional projections of the three-dimensional fracture features. The results show that FCG rates increased by up to two orders of magnitude under dwell fatigue loading conditions when propagating by the faceted mechanism compared to the classical striation growth mechanism. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
C1 USAF, Res Lab, Mat & Mfg Directorate, AFRL,RXCM, Wright Patterson AFB, OH 45433 USA.
RP Pilchak, AL (reprint author), USAF, Res Lab, Mat & Mfg Directorate, AFRL,RXCM, Wright Patterson AFB, OH 45433 USA.
EM adam.pilchak@wpafb.af.mil
FU Air Force Office of Scientific Research
FX This work was performed as part of the inhouse research activities of
the Air Force Research Laboratory's Materials and Manufacturing
Directorate and was supported by the Air Force Office of Scientific
Research. The support and encouragement of the program manager, Dr. Ali
Sayir, and the AFRL management are gratefully acknowledged. The author
is also grateful to Dr. M.C. Brandes for providing the fractured samples
used in this work and to J.C. Mossing for assistance with fractography.
Prof. J.C. Williams is acknowledged for many insightful discussions on
fatigue of titanium alloys.
NR 32
TC 16
Z9 17
U1 3
U2 46
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6462
J9 SCRIPTA MATER
JI Scr. Mater.
PD MAR
PY 2013
VL 68
IS 5
BP 277
EP 280
DI 10.1016/j.scriptamat.2012.10.041
PG 4
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 077EZ
UT WOS:000314012000014
ER
PT J
AU Chiappe, D
Conger, M
Liao, J
Caldwell, JL
Vu, KPL
AF Chiappe, Dan
Conger, Mark
Liao, Janet
Caldwell, J. Lynn
Vu, Kim-Phuong L.
TI Improving multi-tasking ability through action videogames
SO APPLIED ERGONOMICS
LA English
DT Article
DE Multi-tasking; Videogame training; Attention
ID SITUATION AWARENESS; SPATIAL COGNITION; TASK; ATTENTION; MEMORY; SYSTEM;
IMPACT; SKILL; GAMES
AB The present study examined whether action videogames can improve multi-tasking in high workload environments. Two groups with no action videogame experience were pre-tested using the Multi-Attribute Task Battery (MATB). It consists of two primary tasks; tracking and fuel management, and two secondary tasks; systems monitoring and communication. One group served as a control group, while a second played action videogames a minimum of 5 h a week for 10 weeks. Both groups returned for a post-assessment on the MATS. We found the videogame treatment enhanced performance on secondary tasks, without interfering with the primary tasks. Our results demonstrate action videogames can increase people's ability to take on additional tasks by increasing attentional capacity. (C) 2012 Elsevier Ltd and The Ergonomics Society. All rights reserved.
C1 [Chiappe, Dan; Liao, Janet; Vu, Kim-Phuong L.] Calif State Univ Long Beach, Dept Psychol, Long Beach, CA 90840 USA.
[Conger, Mark] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Caldwell, J. Lynn] Northrop Grumman Corp, Adv Programs & Technol, El Segundo, CA 90245 USA.
RP Chiappe, D (reprint author), Calif State Univ Long Beach, Dept Psychol, 1250 N Bellflower Blvd, Long Beach, CA 90840 USA.
EM dan.chiappe@csulb.edu
FU Northrop Grumman Corporation
FX This research was funded by Northrop Grumman Corporation.
NR 37
TC 21
Z9 21
U1 2
U2 61
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0003-6870
J9 APPL ERGON
JI Appl. Ergon.
PD MAR
PY 2013
VL 44
IS 2
BP 278
EP 284
DI 10.1016/j.apergo.2012.08.002
PG 7
WC Engineering, Industrial; Ergonomics; Psychology, Applied
SC Engineering; Psychology
GA 038MP
UT WOS:000311179100014
PM 22981314
ER
PT J
AU Park, K
Drummy, LF
Wadams, RC
Koerner, H
Nepal, D
Fabris, L
Vaia, RA
AF Park, Kyoungweon
Drummy, Lawrence F.
Wadams, Robert C.
Koerner, Hilmar
Nepal, Dhriti
Fabris, Laura
Vaia, Richard A.
TI Growth Mechanism of Gold Nanorods
SO CHEMISTRY OF MATERIALS
LA English
DT Article
DE gold nanorods; growth mechanism; seed-mediated growth; surface
reconstruction
ID SURFACE; ADSORPTION; RECONSTRUCTION; NANOPARTICLES; INTERFACE;
RESONANCE; KINETICS; PLASMONS; CLUSTERS; FACETS
AB Gold nanorods (Au NRs) are the archetype of a nanoantenna, enabling the directional capture, routing, and concentration of electromagnetic fields at the nanoscale. Solution-based synthesis methods afford advantages relative to top-down fabrication but are challenged by insufficient precision of structure, presence of byproducts, limited tunability of architecture, and device integration. This is due in part to an inadequate understanding of the early stages of Au NR growth. Here, using phase transfer via ligand exchange with monothiolated polystyrene, we experimentally demonstrate the complete evolution of seed-mediated Au NR growth in hexadecyltrimethylammonium bromide (CTAB) solution. Au NR size and shape progress from slender spherocylinders at short reaction times to rods with a dumbbell profile, flattened end facets, and octagonal prismatic structures at later stages. These evolve from a single mechanism and reflect the majority of reported Au NR morphologies, albeit reflecting different stages. Additionally, the fraction of nonrod impurities in a reaction is related to the initial distribution of the structure of the seed particles. Overall, the observations of early and intermediate stage growth are consistent with the formation of a surfactant bilayer on different crystal facets at different growth stages due to a fine balance between kinetic and thermodynamic factors.
C1 [Park, Kyoungweon; Drummy, Lawrence F.; Koerner, Hilmar; Nepal, Dhriti; Vaia, Richard A.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Park, Kyoungweon; Koerner, Hilmar] UES Inc, Dayton, OH 45432 USA.
[Wadams, Robert C.; Fabris, Laura] Rutgers State Univ, Dept Mat Sci & Engn, Piscataway, NJ 08854 USA.
RP Vaia, RA (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM richard.vaia@wpafb.af.mil
FU Materials and Manufacturing Directorate; Air Force Office of Scientific
Research; Office of Science, Office of Basic Energy Sciences, of the
U.S. Department of Energy [DE-AC02-05CH11231]
FX This work was completed at Air Force Research Laboratory (AFRL) at
Wright Patterson Air Force Base with funding from Materials and
Manufacturing Directorate, as well as Air Force Office of Scientific
Research. We would like to thank Dr. Alexander Hexemer and Dr. Eric
Schaible for guidance, setup and data collection at beamline 7.3.3 at
Advanced Light Source/Lawrence Berkley National Laboratory. The Advanced
Light Source is supported by the Director, Office of Science, Office of
Basic Energy Sciences, of the U.S. Department of Energy under Contract
No. DE-AC02-05CH11231.
NR 46
TC 60
Z9 61
U1 13
U2 228
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0897-4756
J9 CHEM MATER
JI Chem. Mat.
PD FEB 26
PY 2013
VL 25
IS 4
BP 555
EP 563
DI 10.1021/cm303659q
PG 9
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 099JY
UT WOS:000315618500007
ER
PT J
AU Ku, Z
Jang, WY
Zhou, JF
Kim, JO
Barve, AV
Silva, S
Krishna, S
Brueck, SRJ
Nelson, R
Urbas, A
Kang, S
Lee, SJ
AF Ku, Zahyun
Jang, Woo-Yong
Zhou, Jiangfeng
Kim, Jun Oh
Barve, Ajit V.
Silva, Sinhara
Krishna, Sanjay
Brueck, S. R. J.
Nelson, Robert
Urbas, Augustine
Kang, Sangwoo
Lee, Sang Jun
TI Analysis of subwavelength metal hole array structure for the enhancement
of back-illuminated quantum dot infrared photodetectors
SO OPTICS EXPRESS
LA English
DT Article
ID FOCAL-PLANE ARRAYS; WELL
AB This paper is focused on analyzing the impact of a two-dimensional metal hole array structure integrated to the back-illuminated quantum dots-in-a-well (DWELL) infrared photodetectors. The metal hole array consisting of subwavelength-circular holes penetrating gold layer (2D-Au-CHA) provides the enhanced responsivity of DWELL infrared photodetector at certain wavelengths. The performance of 2D-Au-CHA is investigated by calculating the absorption of active layer in the DWELL structure using a finite integration technique. Simulation results show that the performance of the DWELL focal plane array (FPA) is improved by enhancing the coupling to active layer via local field engineering resulting from a surface plasmon polariton mode and a guided Fabry-Perot mode. Simulation method accomplished in this paper provides a generalized approach to optimize the design of any type of couplers integrated to infrared photodetectors. Experimental results demonstrate the enhanced signal-to-noise ratio by the 2D-Au-CHA integrated FPA as compared to the DWELL FPA. A comparison between the experiment and the simulation shows a good agreement. (C) 2013 Optical Society of America
C1 [Ku, Zahyun; Nelson, Robert; Urbas, Augustine] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Jang, Woo-Yong; Kim, Jun Oh; Barve, Ajit V.; Krishna, Sanjay; Brueck, S. R. J.] Univ New Mexico, Dept Elect & Comp Engn, Ctr High Technol Mat, Albuquerque, NM 87106 USA.
[Zhou, Jiangfeng; Silva, Sinhara] Univ S Florida, Dept Phys, Tampa, FL 33620 USA.
[Kang, Sangwoo] Korea Res Inst Stand & Sci, Div Ind Metrol, Taejon 305340, South Korea.
RP Ku, Z (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM sjlee@kriss.re.kr
RI Zhou, Jiangfeng/D-4292-2009
OI Zhou, Jiangfeng/0000-0002-6958-3342
FU Korea Research Institute of Standards and Science [JP2012-0001]; AFRL
[FA9453-12-1-0131]
FX This work was supported by the Korea Research Institute of Standards and
Science under the project "Study of infrared surface plasmon resonance
for optical enhancement and wavelength tuning", grant JP2012-0001. We
also acknowledge AFRL contract FA9453-12-1-0131.
NR 23
TC 9
Z9 9
U1 2
U2 54
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD FEB 25
PY 2013
VL 21
IS 4
BP 4709
EP 4716
DI 10.1364/OE.21.004709
PG 8
WC Optics
SC Optics
GA 104KU
UT WOS:000315992600076
PM 23482003
ER
PT J
AU dos Reis, R
Ophus, C
Jimenez, J
Snure, M
Gerard, B
Liliental-Weber, Z
AF dos Reis, R.
Ophus, C.
Jimenez, J.
Snure, M.
Gerard, B.
Liliental-Weber, Z.
TI Direct atomic imaging of antiphase boundaries and orthotwins in
orientation-patterned GaAs
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID BEAM ELECTRON-DIFFRACTION; CRYSTAL POLARITY; FILMS; MICROSCOPE;
CONVERSION; EPITAXY
AB We use transmission electron microscopy to study orientation-patterned GaAs layers very attractive for applications in terahertz and infrared frequency conversion devices. We observe regularly distributed inversion domains separated by inversion boundaries, together with undesirable microtwin defects originating at these boundaries. Atomic resolution aberration-corrected scanning transmission electron microscopy allowed us to resolve the GaAs dumbbells leading to a direct determination of the growth polarity of particular domains and determination of the alternating Ga-Ga and As-As bonds at the {110}-type antiphase boundary planes. We also determined observed microtwins as rotation twins called orthotwins, the defect that can cause optical losses. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793651]
C1 [dos Reis, R.; Liliental-Weber, Z.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA.
[Ophus, C.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
[Jimenez, J.] Univ Valladolid, Valladolid, Spain.
[Snure, M.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Gerard, B.] III V Lab 1, F-91767 Palaiseau, France.
RP dos Reis, R (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RI Ophus, Colin/H-2350-2013; dos Reis, Roberto/E-9486-2012; Foundry,
Molecular/G-9968-2014;
OI dos Reis, Roberto/0000-0002-6011-6078; Ophus, Colin/0000-0003-2348-8558
FU Office of Science, Office of Basic Energy Sciences, Division of
Materials Sciences and Engineering of the U.S. Department of Energy
[DE-AC02-05CH11231]
FX This work was supported by the Director, Office of Science, Office of
Basic Energy Sciences, Division of Materials Sciences and Engineering of
the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The
authors appreciate the use of the TEM facility at the National Center
for Electron Microscopy at the Lawrence Berkeley National Laboratory.
NR 26
TC 2
Z9 2
U1 0
U2 28
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD FEB 25
PY 2013
VL 102
IS 8
AR 081905
DI 10.1063/1.4793651
PG 4
WC Physics, Applied
SC Physics
GA 099CN
UT WOS:000315597000037
ER
PT J
AU Muratore, C
Varshney, V
Gengler, JJ
Hu, JJ
Bultman, JE
Smith, TM
Shamberger, PJ
Qiu, B
Ruan, X
Roy, AK
Voevodin, AA
AF Muratore, C.
Varshney, V.
Gengler, J. J.
Hu, J. J.
Bultman, J. E.
Smith, T. M.
Shamberger, P. J.
Qiu, B.
Ruan, X.
Roy, A. K.
Voevodin, A. A.
TI Cross-plane thermal properties of transition metal dichalcogenides
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID THIN-FILMS; PYROLYTIC GRAPHITE; MOS2; CONDUCTIVITY; CRYSTALS; SPECTRA;
GROWTH
AB In this work, we explore the thermal properties of hexagonal transition metal dichalcogenide compounds with different average atomic masses but equivalent microstructures. Thermal conductivity values of sputtered thin films were compared to bulk crystals. The comparison revealed a > 10 fold reduction in thin film thermal conductivity. Structural analysis of the films revealed a turbostratic structure with domain sizes on the order of 5-10 nm. Estimates of phonon scattering lengths at domain boundaries based on computationally derived group velocities were consistent with the observed film microstructure, and accounted for the reduction in thermal conductivity compared to values for bulk crystals. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793203]
C1 [Muratore, C.] Univ Dayton, Dept Chem & Mat Engn, Dayton, OH 45469 USA.
[Muratore, C.; Varshney, V.; Gengler, J. J.; Hu, J. J.; Bultman, J. E.; Shamberger, P. J.; Roy, A. K.; Voevodin, A. A.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Varshney, V.] Universal Technol Corp, Dayton, OH 45432 USA.
[Gengler, J. J.] Spectral Energies LLC, Dayton, OH 45431 USA.
[Hu, J. J.; Bultman, J. E.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Smith, T. M.] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA.
[Qiu, B.; Ruan, X.] Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
[Qiu, B.; Ruan, X.] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
RP Muratore, C (reprint author), Univ Dayton, Dept Chem & Mat Engn, Dayton, OH 45469 USA.
EM christophermuratore@hotmail.com
RI Voevodin, Andrey/I-6684-2013; Ruan, Xiulin/C-6166-2009; Shamberger,
Patrick/C-4795-2014
OI Ruan, Xiulin/0000-0001-7611-7449; Shamberger,
Patrick/0000-0002-8737-6064
FU Air Force Office of Scientific Research; Air Force Research Laboratory
FX The authors are grateful for funding from the Thermal Sciences Program
of the Air Force Office of Scientific Research for financial support of
this work. X.R. was sponsored by an Air Force Research Laboratory Summer
Faculty Fellowship. C.M. would like to thank Professor Tim Fisher at
Purdue and Professor David Cahill at UIUC for insightful discussions and
guidance.
NR 30
TC 31
Z9 31
U1 4
U2 83
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0003-6951
EI 1077-3118
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD FEB 25
PY 2013
VL 102
IS 8
AR 081604
DI 10.1063/1.4793203
PG 4
WC Physics, Applied
SC Physics
GA 099CN
UT WOS:000315597000029
ER
PT J
AU Stone, DS
Harbin, S
Mohseni, H
Mogonye, JE
Scharf, TW
Muratore, C
Voevodin, AA
Martini, A
Aouadi, SM
AF Stone, D. S.
Harbin, S.
Mohseni, H.
Mogonye, J. -E.
Scharf, T. W.
Muratore, C.
Voevodin, A. A.
Martini, A.
Aouadi, S. M.
TI Lubricious silver tantalate films for extreme temperature applications
SO SURFACE & COATINGS TECHNOLOGY
LA English
DT Article
DE Tribology; Friction; Chameleon coating; Tantalum nitride; Silver
tantalate
ID THIN-FILMS; NANOCOMPOSITE COATINGS; TRIBOLOGICAL PROPERTIES; OXIDE;
TRANSPORT; LUBRICANT; SULFUR; AGTAO3
AB Silver tantalate was investigated as a potential lubricious material for moving assemblies in high temperature tribological applications. Three different approaches were explored for the creation of such materials on Inconel substrates: (1) powders produced using a solid state which were burnished on the surface; (2) monolithic silver tantalate thin films deposited by magnetron sputtering; and, (3) an adaptive tantalum nitride/silver nanocomposite sputter-deposited coating that forms a lubricious silver tantalate oxide on its surface when operated at elevated temperatures. Dry sliding wear tests of the coatings against Si3N4 counterfaces revealed friction coefficients in the 0.06-0.15 range at T similar to 750 degrees C. Reduced friction coefficients were found in nanocomposite materials that contained primarily a AgTaO3 phase with a small amount of segregated Ag phase, as suggested by structural characterization using X-ray diffraction. Furthermore, cross-sectional transmission electron microscopy techniques determined that the reduced coefficient of friction at T similar to 750 degrees C was primarily the result of the formation of a lubricious AgTaO3 phase that reconstructs during the wear process into a mechanically mixed layer of AgTaO3, Ta2O5, and Ag nanoparticles. (c) 2012 Elsevier B.V. All rights reserved.
C1 [Stone, D. S.; Harbin, S.; Aouadi, S. M.] So Illinois Univ, Dept Phys, Carbondale, IL 62901 USA.
[Mohseni, H.; Mogonye, J. -E.; Scharf, T. W.] Univ N Texas, Dept Mat Sci & Engn, Denton, TX 76207 USA.
[Muratore, C.; Voevodin, A. A.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Martini, A.] Univ Calif Merced, Sch Engn, Merced, CA 95343 USA.
RP Aouadi, SM (reprint author), So Illinois Univ, Dept Phys, Carbondale, IL 62901 USA.
EM saouadi@physics.siu.edu
RI Mohseni, Hamidreza/D-9218-2013; Voevodin, Andrey/I-6684-2013
OI Mohseni, Hamidreza/0000-0002-6067-9428;
FU Air Force Office of Scientific Research [W911NF-08-1-0460]; National
Science Foundation [0653986, 0959568]
FX This research is also supported by the Air Force Office of Scientific
Research (award no. W911NF-08-1-0460) and by the National Science
Foundation (award nos. 0653986 and 0959568).
NR 24
TC 13
Z9 15
U1 5
U2 56
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0257-8972
J9 SURF COAT TECH
JI Surf. Coat. Technol.
PD FEB 25
PY 2013
VL 217
BP 140
EP 146
DI 10.1016/j.surfcoat.2012.12.004
PG 7
WC Materials Science, Coatings & Films; Physics, Applied
SC Materials Science; Physics
GA 104EU
UT WOS:000315975400020
ER
PT J
AU Herweg, J
Kerekes, J
Eismann, M
AF Herweg, Jared
Kerekes, John
Eismann, Michael
TI Separability between pedestrians in hyperspectral imagery
SO APPLIED OPTICS
LA English
DT Article
AB The popularity of hyperspectral imaging (HSI) in remote sensing continues to lead to it being adapted in novel ways to overcome challenging imaging problems. This paper reports on research efforts exploring the phenomenology of using HSI as an aid in detecting and tracking human pedestrians. An assessment of the likelihood of distinguishing between pedestrians based on the measured spectral reflectance of observable materials and the presence of noise is presented. The assessments included looking at the spectral separation between pedestrian material subregions using different spectral-reflectance regions within the full range (450-2500 nm), as well as when the spectral content of the pedestrian subregions are combined. In addition to the pedestrian spectral-reflectance data analysis, the separability of pedestrian subregions in remotely sensed hyperspectral images was assessed using a unique data set garnered as part of this work. Results indicated that skin was the least distinguishable material between pedestrians using the spectral Euclidean distance metric. The clothing, especially the shirt, offered the most salient feature for distinguishing the pedestrian. Additionally, significant spectral separability performance is realized when combining the reflectance information of two or more subregions. (C) 2013 Optical Society of America
C1 [Herweg, Jared] USAF, Inst Technol, Dayton, OH 45433 USA.
[Herweg, Jared; Kerekes, John] Rochester Inst Technol, Rochester, NY 14623 USA.
[Eismann, Michael] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Herweg, J (reprint author), USAF, Inst Technol, Dayton, OH 45433 USA.
EM jxh6389@cis.rit.edu
NR 16
TC 1
Z9 1
U1 0
U2 9
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1559-128X
EI 2155-3165
J9 APPL OPTICS
JI Appl. Optics
PD FEB 20
PY 2013
VL 52
IS 6
BP 1330
EP 1338
DI 10.1364/AO.52.001330
PG 9
WC Optics
SC Optics
GA 094TM
UT WOS:000315286700029
PM 23435007
ER
PT J
AU Afrooz, ARMN
Khan, IA
Hussain, SM
Saleh, NB
AF Afrooz, A. R. M. Nabiul
Khan, Iftheker A.
Hussain, Saber M.
Saleh, Navid B.
TI Mechanistic Heteroaggregation of Gold Nanoparticles in a Wide Range of
Solution Chemistry
SO ENVIRONMENTAL SCIENCE & TECHNOLOGY
LA English
DT Article
ID MULTIWALLED CARBON NANOTUBES; POLY(ACRYLIC ACID) BRUSHES; DYNAMIC
LIGHT-SCATTERING; COLLOIDAL PARTICLES; AGGREGATION KINETICS; POLYSTYRENE
LATEX; RATE CONSTANTS; HUMIC-ACID; DISPERSIONS; BEHAVIOR
AB Heteroaggregation behavior of gold nanospheres (AuNS) in presence of pluronic acid (PA) modified single-walled carbon nanotubes (PA-SWNTs) was systematically studied for a wide range of mono- and divalent (NaCl and CaCl2) electrolyte conditions. Homoaggregation rates of AuNS were also determined to delineate heteroaggregation mechanisms. Time resolved dynamic light scattering (DLS) was employed to monitor aggregation. The homoaggregation of AuNS showed classical Derjaguin-Landau-Verwey-Overbeek (DLVO) type behavior with defined reaction limited (RLCA) and diffusion limited (DLCA) aggregation regimes. PA-SWNTs homoaggregation on the one hand showed no response with electrolyte increase. AuNS heteroaggregation rates on the other hand, showed regime dependent response. At low electrolyte or RLCA regime, AuNS heteroaggregation showed significantly slower rates, compared to its homoaggregation behavior; whereas enhanced heteroaggregation was observed for DLCA regime. The key mechanisms of heteroaggregation of AuNS are identified as obstruction to collision at RLCA regime and facilitating enhanced attachment at DLCA regime manifested by the presence of PA-SWNTs. Presence of Suwannee River humic acid (SRHA) showed aggregation enhancement for both homo- and hetero-systems, in presence of divalent Ca2+ ions. Bridging between SRHA molecules is identified as the key mechanism for increased aggregation rate. The findings of this study are relevant particularly to coexistence of engineered nanomaterials. The strategy of using nonaggregating PA-SWNTs is a novel experimental strategy that can be adopted elsewhere to further the heteroaggregation studies for a wider set of particles and surface coatings.
C1 [Afrooz, A. R. M. Nabiul; Khan, Iftheker A.; Saleh, Navid B.] Univ S Carolina, Dept Civil & Environm Engn, Columbia, SC 29208 USA.
[Hussain, Saber M.] USAF, Human Effectiveness Directorate, Res Lab, Dayton, OH 45431 USA.
RP Saleh, NB (reprint author), Univ S Carolina, Dept Civil & Environm Engn, Columbia, SC 29208 USA.
EM salehn@engr.sc.edu
OI Khan, Iftheker/0000-0001-7771-5635
FU US Air Force Research Lab [FA 8650-10-2-6062]
FX Funding was provided by the US Air Force Research Lab (Award# FA
8650-10-2-6062). We are grateful to Dr. Haijun Qian of Clemson
Microscopy Center for his kind assistance in TEM imaging.
NR 56
TC 32
Z9 32
U1 7
U2 111
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0013-936X
J9 ENVIRON SCI TECHNOL
JI Environ. Sci. Technol.
PD FEB 19
PY 2013
VL 47
IS 4
BP 1853
EP 1860
DI 10.1021/es3032709
PG 8
WC Engineering, Environmental; Environmental Sciences
SC Engineering; Environmental Sciences & Ecology
GA 095IA
UT WOS:000315326700010
PM 23360522
ER
PT J
AU Mao, XY
Sun, H
Wang, W
Chen, XB
Lu, YL
AF Mao, Xiangyu
Sun, Hui
Wang, Wei
Chen, Xiaobing
Lu, Yalin
TI Ferromagnetic, ferroelectric properties, and magneto-dielectric effect
of Bi4.25La0.75Fe0.5Co0.5Ti3O15 ceramics
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID BISMUTH TITANATE; SINGLE-CRYSTAL; THIN-FILMS; BI4TI3O12; BI5FETI3O15;
BIFEO3
AB Multiferroic properties of four-layered Bi4.25La0.75Fe0.5Co0.5Ti3O15 ceramics were carefully investigated. X-ray diffraction and high resolution transmission electron microscopy analyses indicate that the as-prepared sample is almost free from secondary phases, and magnetization measurements confirm a ferromagnetic transition similar to 483 K. At room temperature (RT), the sample shows a typical ferromagnetism with a remnant magnetization (2M(r)) of similar to 51.2 m emu/g, and a good ferroelectric hysteresis with a remnant polarization (2P(r)) of similar to 15.4 mu C/cm(2). More importantly, an obvious magneto-dielectric (MD) effect has been found under a low magnetic field of 1 T at RT with a maximum of magneto-dielectric constant of similar to 10.5%. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793305]
C1 [Mao, Xiangyu; Sun, Hui; Wang, Wei; Chen, Xiaobing] Yangzhou Univ, Coll Phys Sci & Technol, Yangzhou 225002, Peoples R China.
[Sun, Hui] Nanjing Univ, Nanjing Natl Lab Microstruct, Nanjing 210093, Jiangsu, Peoples R China.
[Lu, Yalin] Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.
[Lu, Yalin] Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China.
[Lu, Yalin] USAF Acad, Laser Opt Res Ctr, Colorado Springs, CO 80840 USA.
RP Lu, YL (reprint author), Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.
EM xbchen@yzu.edu.cn
RI Sun, Hui/L-2826-2015
FU Chinese National Science Foundation [51072177]; National Basic Research
Program of China [2012CB22001]
FX This work was supported by the Chinese National Science Foundation
(Grant No. 51072177) and partial appreciation will be given to by the
National Basic Research Program of China (2012CB22001).
NR 34
TC 34
Z9 34
U1 6
U2 105
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD FEB 18
PY 2013
VL 102
IS 7
AR 072904
DI 10.1063/1.4793305
PG 5
WC Physics, Applied
SC Physics
GA 099CK
UT WOS:000315596700052
ER
PT J
AU Ullrich, B
Wang, JS
AF Ullrich, B.
Wang, J. S.
TI All-optical tuning of the Stokes shift in PbS quantum dots
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID NANOCRYSTALS; STATE
AB The Stokes shift of colloidal 4.7 nm PbS quantum dots was measured between 5 and 300 K at incrementally increasing continuous laser intensities. The results demonstrate Stokes shift tuning by optical means only at stable given temperatures due to optically enforced electronic state alteration in the quantum dots. The tuning phenomenon is perfectly fit by a semi-empirical model, which provides a design tool for the chromaticity of quantum dots at different optical pump intensities. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793413]
C1 [Ullrich, B.] Univ Nacl Autonoma Mexico, Inst Ciencias Fis, Cuernavaca 62210, Morelos, Mexico.
[Wang, J. S.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Ullrich, B (reprint author), Univ Nacl Autonoma Mexico, Inst Ciencias Fis, Cuernavaca 62210, Morelos, Mexico.
EM bruno@fis.unam.mx
NR 16
TC 9
Z9 9
U1 1
U2 46
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD FEB 18
PY 2013
VL 102
IS 7
AR 071905
DI 10.1063/1.4793413
PG 3
WC Physics, Applied
SC Physics
GA 099CK
UT WOS:000315596700017
ER
PT J
AU Zherebtsov, SV
Murzinova, MA
Klimova, MV
Salishchev, GA
Popov, AA
Semiatin, SL
AF Zherebtsov, S. V.
Murzinova, M. A.
Klimova, M. V.
Salishchev, G. A.
Popov, A. A.
Semiatin, S. L.
TI Microstructure evolution during warm working of Ti-5Al-5Mo-5V-1Cr-1Fe at
600 and 800 degrees C
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Titanium alloys; Thermomechanical processing; Microstructure refinement;
Speroidization; Precipitation
ID TITANIUM-ALLOYS; COARSENING BEHAVIOR; TRANSITION CLASS; HEAT-TREATMENT;
HOT-WORKING; TI-6AL-4V; DEFORMATION; GLOBULARIZATION; FLOW
AB Microstructure evolution during compression to the true height strain 0.29, 0.69, or 1.2 at 600 and 800 C of the beta-rich titanium alloy Ti-5Al-5Mo-5V-1Cr-1Fe (VT22) with an initial lamellar microstructure was established using scanning and transmission electron microscopy. It was found that microstructure evolution at both temperatures was controlled primarily by substructure evolution within the beta phase. At 800 degrees C, extensive recovery within the beta phase resulted in the formation of a stable structure comprising subgrains similar to 1.5 mu m in diameter. During deformation at this temperature, lamellae of the alpha phase fragmented via a boundary-grooving mechanism. Due to the sluggish diffusion kinetics, however, spheroidization at 800 degrees C was incomplete. At the lower processing temperature, recovery processes within the beta phase were much slower, leading to greater refinement of the beta matrix. The decomposition of the metastable beta phase during warm working, gave rise to very fine alpha-lath precipitates, which resulted in the formation of an ultrafine microstructure with a grain size of 0.5 mu m. (c) 2012 Elsevier B.V. All rights reserved.
C1 [Zherebtsov, S. V.; Klimova, M. V.; Salishchev, G. A.] Belgorod State Univ, Lab Bulk Nanostruct Mat, Belgorod 308015, Russia.
[Murzinova, M. A.] Inst Met Superplast Problems, Ufa 450001, Russia.
[Popov, A. A.] Ural Fed Univ, Ekaterinburg 620002, Russia.
[Semiatin, S. L.] USAF, Res Lab, Mat & Mfg Directorate, AFRL RXLM, Wright Patterson AFB, OH 45433 USA.
RP Zherebtsov, SV (reprint author), Belgorod State Univ, Lab Bulk Nanostruct Mat, Pobeda 85, Belgorod 308015, Russia.
EM ser_z@mail.ru
RI Zherebtsov, Sergey/G-7435-2011; Popov, Artemiy/G-3947-2016; Salishchev,
Gennady/G-4767-2016; SEMIATIN, SHELDON/E-7264-2017
OI Zherebtsov, Sergey/0000-0002-1663-429X; Popov,
Artemiy/0000-0001-6171-1701; Salishchev, Gennady/0000-0002-0815-3525;
FU Federal Agency for Education, Russia [14.A18.21.1637]
FX This work was supported by the Federal Agency for Education, Russia;
Grant #14.A18.21.1637.
NR 29
TC 15
Z9 17
U1 2
U2 27
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD FEB 15
PY 2013
VL 563
BP 168
EP 176
DI 10.1016/j.msea.2012.11.042
PG 9
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 091PT
UT WOS:000315063000024
ER
PT J
AU Sukeshini, AM
Meisenkothen, F
Gardner, P
Reitz, TL
AF Sukeshini, Mary A.
Meisenkothen, Frederick
Gardner, Paul
Reitz, Thomas L.
TI Aerosol Jet (R) Printing of functionally graded SOFC anode interlayer
and microstructural investigation by low voltage scanning electron
microscopy
SO JOURNAL OF POWER SOURCES
LA English
DT Article
DE Solid oxide fuel cell; Functionally graded anode interlayer; Aerosol jet
printing; Low voltage scanning electron microscopy; Microstructure
ID OXIDE FUEL-CELLS; THIN-FILM; LAYERS; TECHNOLOGY; CATHODE; DEPOSITION;
SUBSTRATE; CERMETS; DEVICE
AB Yttria-stabilized zirconia (YSZ) electrolyte and functionally graded anode interlayers with compositional variation were deposited by Aerosol Jet (R) Printing (AJP) using ink suspensions of NiO and YSZ. The AJP system's dual atomizer configuration that allows on-demand material mixing was used to deposit the graded composite anode interlayer. These layers together with an LSM (strontium doped lanthanum manganite) based pasted cathode layer were integrated in an anode supported SOFC button cell. Cells with graded anode interlayers performed better than cells with a non-graded anode interlayer. The enhancement in electrochemical performance can be attributed to the compositional gradation. The current printing method of fabricating SOFC layers shows clear advantages of high reproducibility. In routine SEM (scanning electron microscopy) evaluation of microstructures, acceleration voltages typically used are 10-20 kV. Due to the similar backscattering coefficients of YSZ and Ni, it is difficult to clearly distinguish between the two phases in the image. In this work, low accelerating voltages (<5 kV) were used to introduce a divergence of the YSZ and Ni backscatter coefficients to investigate the composite layers printed. The backscattering mechanism for image contrast was confirmed and clarified by specially designed SEM experiments that isolated BSE (back scattered electrons) from SE (secondary electrons). (C) 2012 Elsevier B.V. All rights reserved.
C1 [Sukeshini, Mary A.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Meisenkothen, Frederick] UES Corp, Dayton, OH 45432 USA.
[Sukeshini, Mary A.; Gardner, Paul; Reitz, Thomas L.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Sukeshini, AM (reprint author), Univ Dayton, Res Inst, Dayton, OH 45469 USA.
EM mary.ayyadurai.ctr@wpafb.af.mil
FU Optomec Inc.; Air Force Research Laboratory
FX The authors are greatly appreciative for the assistance of Dr. David Joy
of the University of Tennessee at Knoxville and Oak Ridge National
Laboratory for his helpful discussions in regards to understanding
low-voltage contrast mechanisms and image interpretation. Credit is also
due to the staff of the Air Force research laboratory Materials
Characterization Facility for making the specimen preparations for
imaging described in this work. Mr. Thomas Jenkins' assistance with cell
testing is acknowledged. The author, MSA acknowledges Optomec Inc., and
the Air Force Research Laboratory for the funding, and Dr. Ryan Miller,
AFRL for the facilities and related help.
NR 35
TC 7
Z9 7
U1 3
U2 65
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0378-7753
J9 J POWER SOURCES
JI J. Power Sources
PD FEB 15
PY 2013
VL 224
BP 295
EP 303
DI 10.1016/j.jpowsour.2012.09.094
PG 9
WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials
Science, Multidisciplinary
SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science
GA 068TZ
UT WOS:000313390400040
ER
PT J
AU Fitzgerald, LA
Petersen, ER
Leary, DH
Nadeau, LJ
Soto, CM
Ray, RI
Little, BJ
Ringeisen, BR
Johnson, GR
Vora, GJ
Biffinger, JC
AF Fitzgerald, Lisa A.
Petersen, Emily R.
Leary, Dagmar H.
Nadeau, Lloyd J.
Soto, Carissa M.
Ray, Richard I.
Little, Brenda J.
Ringeisen, Bradley R.
Johnson, Glenn R.
Vora, Gary J.
Biffinger, Justin C.
TI Shewanella frigidimarina microbial fuel cells and the influence of
divalent cations on current output
SO BIOSENSORS & BIOELECTRONICS
LA English
DT Article; Proceedings Paper
CT 22nd Anniversary World Congress on Biosensors / Summer School on Printed
Biosensors and Electronics
CY MAY 15-18, 2012
CL Cancun, MEXICO
SP Elsevier, Linkoping Univ, Erkon
DE Shewanella frigidimarina; Shewanella oneidensis MR-1; Microbial fuel
cell; Extracellular electron transfer
ID EXTRACELLULAR ELECTRON-TRANSFER; OUTER-MEMBRANE CYTOCHROMES; ONEIDENSIS
MR-1; SOLUBLE CYTOCHROMES; STATISTICAL-MODEL; REDUCTION; IDENTIFICATION;
ELECTRICITY; GEOBACTER; MTRC
AB The genes involved in the proposed pathway for Shewanella extracellular electron transfer (EET) are highly conserved. While extensive studies involving EET from a fresh water Shewanella microbe (S. oneidensis MR-1) to soluble and insoluble electron acceptors have been published, only a few reports have examined EET from marine strains of Shewanella. Thus, Shewanella frigidimarina (an isolate from Antarctic Sea ice) was used within miniature microbial fuel cells (mini-MFC) to evaluate potential power output. During the course of this study several distinct differences were observed between S. oneidensis MR-1 and S. frigidimarina under comparable conditions. The maximum power density with S. frigidimarina was observed when the anolyte was half-strength marine broth (1/2 MB) (0.28 mu W/cm(2)) compared to Luria-Bertani (LB) (0.07 mu W/cm(2)) or a defined growth minimal medium (MM) (0.02 mu W/cm(2)). The systematic modification of S. frigidimarina cultured in 1/2 MB and LB with divalent cations shows that a maximum current output can be generated independent of internal ionic ohmic losses and the presence of external mediators. Published by Elsevier B.V.
C1 [Fitzgerald, Lisa A.; Ringeisen, Bradley R.; Biffinger, Justin C.] USN, Div Chem, Res Lab, Washington, DC 20375 USA.
[Petersen, Emily R.] Nova Res Inc, Alexandria, VA 22308 USA.
[Leary, Dagmar H.] NRL, Natl Res Council, Washington, DC 20375 USA.
[Nadeau, Lloyd J.; Johnson, Glenn R.] USAF, Res Lab, Tyndall Afb, FL 32403 USA.
[Soto, Carissa M.; Vora, Gary J.] USN, Ctr Bio Mol Sci & Engn, Res Lab, Washington, DC 20375 USA.
[Ray, Richard I.; Little, Brenda J.] USN, Res Lab, Div Oceanog, John C Stennis Space Ctr, MS 39529 USA.
RP Biffinger, JC (reprint author), USN, Div Chem, Res Lab, 4555 Overlook Ave SW, Washington, DC 20375 USA.
EM justin.biffinger@nrl.navy.mil
OI Vora, Gary/0000-0002-0657-8597
NR 37
TC 8
Z9 10
U1 1
U2 62
PU ELSEVIER ADVANCED TECHNOLOGY
PI OXFORD
PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON,
OXFORD OX5 1GB, OXON, ENGLAND
SN 0956-5663
EI 1873-4235
J9 BIOSENS BIOELECTRON
JI Biosens. Bioelectron.
PD FEB 15
PY 2013
VL 40
IS 1
SI SI
BP 102
EP 109
DI 10.1016/j.bios.2012.06.039
PG 8
WC Biophysics; Biotechnology & Applied Microbiology; Chemistry, Analytical;
Electrochemistry; Nanoscience & Nanotechnology
SC Biophysics; Biotechnology & Applied Microbiology; Chemistry;
Electrochemistry; Science & Technology - Other Topics
GA 061CX
UT WOS:000312825800017
PM 22796023
ER
PT J
AU Qin, GK
Dennis, PB
Zhang, YJ
Hu, X
Bressner, JE
Sun, ZY
Crookes-Goodson, WJ
Naik, RR
Omenetto, FG
Kaplan, DL
AF Qin, Guokui
Dennis, Patrick B.
Zhang, Yuji
Hu, Xiao
Bressner, Jason E.
Sun, Zhongyuan
Crookes-Goodson, Wendy J.
Naik, Rajesh R.
Omenetto, Fiorenzo G.
Kaplan, David L.
TI Recombinant reflectin-based optical materials
SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
LA English
DT Article
DE optics; reflectin; self-assembly; structural coloration; thin films
ID PROTEIN SECONDARY STRUCTURE; STRUCTURAL COLORATION; SQUID; SPECTROSCOPY;
IRIDESCENCE; IRIDOPHORES; CEPHALOPODS; MECHANISMS; FILMS; SKIN
AB Reflectins are a unique group of structural proteins involved in dynamic optical systems in cephalopods that modulate incident light or bioluminescence. We describe cloning, structural characterization, and optical properties of a reflectin-based domain, refCBA, from reflectin 1a of Hawaiian bobtail squid, Euprymna scolopes. Thin films created from the recombinant protein refCBA display interesting optical features when the recombinant protein is appropriately organized. RefCBA was cloned and expressed as a soluble protein enabling purification, with little structural organization found using Fourier transform infrared spectroscopy and circular dichroism. Single-layer and multi-layer thin films of refCBA were then produced by flow coating and spin coating, and displayed colors due to thin film interference. Diffraction experiments showed the assemblies were ordered enough to work as diffraction gratings to generate diffraction patterns. Nano-spheres and lamellar microstructures of refCBA samples were observed by scanning electron microscopy and atomic force microscopy. Despite the reduced complexity of the refCBA protein compared to natural reflectins, unique biomaterials with similar properties to reflectins were generated by self-assembled reflectin-based refCBA molecules. (C) 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013
C1 [Qin, Guokui; Hu, Xiao; Bressner, Jason E.; Sun, Zhongyuan; Omenetto, Fiorenzo G.; Kaplan, David L.] Tufts Univ, Dept Biomed Engn, Medford, MA 02155 USA.
[Dennis, Patrick B.; Crookes-Goodson, Wendy J.; Naik, Rajesh R.] USAF, Res Lab, Mat & Mfg Directorate Biotechnol Grp, Dayton, OH 45433 USA.
[Zhang, Yuji; Omenetto, Fiorenzo G.] Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA.
RP Kaplan, DL (reprint author), Tufts Univ, Dept Biomed Engn, 4 Colby St, Medford, MA 02155 USA.
EM David.Kaplan@tufts.edu
RI Qin, Guokui/B-1520-2012; Hu, Xiao/F-2403-2012
OI Qin, Guokui/0000-0002-2212-1597; Hu, Xiao/0000-0002-2579-2820
FU AFOSR; NIH (NIBIB) [P41 EB002520]; DARPA
FX Support from the AFOSR and the NIH (NIBIB, P41 EB002520) is gratefully
acknowledged, as is support from DARPA.
NR 37
TC 9
Z9 9
U1 5
U2 66
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0887-6266
J9 J POLYM SCI POL PHYS
JI J. Polym. Sci. Pt. B-Polym. Phys.
PD FEB 15
PY 2013
VL 51
IS 4
BP 254
EP 264
DI 10.1002/polb.23204
PG 11
WC Polymer Science
SC Polymer Science
GA 064ZP
UT WOS:000313115500002
ER
PT J
AU Shuman, NS
Miller, TM
Friedman, JF
Viggiano, AA
AF Shuman, Nicholas S.
Miller, Thomas M.
Friedman, Jeffrey F.
Viggiano, Albert A.
TI Electron Attachment to Fe(CO)(n) (n=0-5)
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID ION PHOTOELECTRON-SPECTROSCOPY; LANGMUIR PROBE TECHNIQUE; MUTUAL
NEUTRALIZATION; FLOWING AFTERGLOW; BOND STRENGTHS; NEGATIVE-IONS;
ENERGIES; SPECTROMETRY; COLLISIONS; CARBONYLS
AB The rate constants of thermal electron attachment at 300 and 400 K to Fe(CO)(n) (n = 0-5) have been measured using a flowing afterglow Langmuir probe apparatus. The stable species Fe(CO)(5) was studied using the traditional method of monitoring electron depletion as a function of reaction time, and the remaining short-lived species were studied using the variable electron and neutral density attachment mass spectrometry (VENDAMS) technique. Attachment to Fe(CO)(5) is purely dissociative and about 20% efficient with a rate constant of (7.9 +/- 1.4) x 10(-8) cm(3) at s(-1) 300 K and (8.8 +/- 2) x 10(-8) cm(3) s(-1) at 400 K. The attachment rate constants decrease significantly as each CO ligand is removed, with Fe(CO)(n) (n = 4 to 1) attaching with efficiencies on the order of 10%, 1%, 0.1%, and 0.01% respectively. Under the conditions here, attachment to Fe(CO)(4) and Fe(CO)(3) are likely entirely dissociative, whereas attachment to Fe(CO)(2) and Fe(CO) are almost entirely associative. A statistical kinetic modeling approach is used to explain the strong dependence of the attachment rate constant on the number of ligands present in the neutral species through a combination of increasing autodetachment rates and decreasing exothermicities to dissociative attachment. The VENDAMS data also define the 300 K mutual neutralization rate constant of Fe(CO)(4)(-) + Ar+ to be (5.0 +/- 0.8) x 10(-8) cm(3) s(-1) with an upper to branching fraction of 0.5 to yield Fe(CO)(4), indicating that significant fragmentation to smaller Fe(CO)(n) occurs.
C1 [Shuman, Nicholas S.; Miller, Thomas M.; Friedman, Jeffrey F.; Viggiano, Albert A.] USAF, Space Vehicles Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
RP Viggiano, AA (reprint author), USAF, Space Vehicles Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
NR 50
TC 2
Z9 2
U1 0
U2 22
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1089-5639
J9 J PHYS CHEM A
JI J. Phys. Chem. A
PD FEB 14
PY 2013
VL 117
IS 6
BP 1102
EP 1109
DI 10.1021/jp304480x
PG 8
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 093HG
UT WOS:000315181700015
PM 22974241
ER
PT J
AU Taylor, DE
Runge, K
Cory, MG
Burns, DS
Vasey, JL
Hearn, JD
Griffith, K
Henley, MV
AF Taylor, DeCarlos E.
Runge, Keith
Cory, Marshall G.
Burns, Douglas S.
Vasey, Joseph L.
Hearn, John D.
Griffith, Kara
Henley, Michael V.
TI Surface Binding of Organophosphates on Silica: Comparing Experiment and
Theory
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID DIMETHYL METHYLPHOSPHONATE; ADSORBED ORGANOPHOSPHONATES;
MOLECULAR-DYNAMICS; AMORPHOUS SILICA; AB-INITIO; ADSORPTION; SENSORS;
SIO2; ENERGIES; VAPOR
AB A consistent embedding hierarchy is applied to the calculation of binding enthalpies for organophosphate molecules to a silica surface and compared to experiment. The interaction of four probe molecules, dimethyl methylphosphonate (DMMP), diisopropyl methylphosphonate (DIMP), diisopropyl fluorophosphate (DFP), and sarin, with the silica surface is examined. Quantum chemical methods are employed to compute binding enthalpies and vibrational spectra for all interactions between probe molecules and silanol sites on the silica surface. Comparison with experimentally measured infrared shifts indicates that the theoretically modeled adsorption sites are similar to those found in experiment. The calculated binding enthalpies agree well with experiment for sarin, Delta H-ads,H-443K = -22.0 kcal/mol (calculated) vs -18.8 +/- 5,5 kcal/mol (measured, 433 K < T-expt < 453 K), and DIMP, Delta H-ads,H-463K = -26.9 kcal/mol (calculated) vs -29.3 +/- 0.9 kcal/mol (measured, 453 K < T-expt < 473 K). Agreement with experiment is less good for DMMP, Delta H-ads,H-463K = -19.7 kcal/mol (calculated) vs -26.1 +/- 1.5 kcal/mol (measured, 453 K < T-expt < 473 K), and DFP, Delta H-ads,H-423K = -20.4 kcal/mol (calculated) vs -27.5 +/- 3.1, kcal/mol (measured, 413 K < T-expt < 433 K).
C1 [Taylor, DeCarlos E.] USA, Res Lab, Weap & Mat Res Directorate, RDRL WML B, Aberdeen Proving Ground, MD 21005 USA.
[Runge, Keith] BWD Associates LLC, Gainesville, FL 32653 USA.
[Cory, Marshall G.; Burns, Douglas S.; Vasey, Joseph L.] ENSCO Inc, Melbourne, FL 32940 USA.
[Hearn, John D.; Henley, Michael V.] US AFRL RXQL, Tyndall AFB, FL 32403 USA.
[Griffith, Kara] UTC Inc, Tyndall AFB, FL 32403 USA.
RP Runge, K (reprint author), BWD Associates LLC, 2901 Northwest 54th Ave, Gainesville, FL 32653 USA.
EM krunge@bellsouth.net
FU Defense Threat Reduction Agency (DTRA) [HDTRA1-10-C-0015]
FX This work was supported by the Defense Threat Reduction Agency (DTRA)
(Contract #: HDTRA1-10-C-0015). While this research has been funded by
the agency, the results and content of this publication do not
necessarily reflect the views and opinions of the funding agency.
NR 27
TC 7
Z9 7
U1 0
U2 52
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD FEB 14
PY 2013
VL 117
IS 6
BP 2699
EP 2708
DI 10.1021/jp306713d
PG 10
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 093HH
UT WOS:000315181800038
ER
PT J
AU Barua, A
Kim, S
Horie, Y
Zhou, M
AF Barua, A.
Kim, S.
Horie, Y.
Zhou, M.
TI Ignition criterion for heterogeneous energetic materials based on
hotspot size-temperature threshold
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID HOT-SPOT IGNITION; THERMAL EXPLOSIONS; SHOCK INITIATION; REACTANT
CONSUMPTION; SOLID EXPLOSIVES; HMX; MODEL; IMPACT; SIMULATIONS;
COMBUSTION
AB A criterion for the ignition of granular explosives (GXs) and polymer-bonded explosives (PBXs) under shock and non-shock loading is developed. The formulation is based on integration of a quantification of the distributions of the sizes and locations of hotspots in loading events using a cohesive finite element method (CFEM) developed recently and the characterization by Tarver et al. [C. M. Tarver et al., "Critical conditions for impact-and shock-induced hot spots in solid explosives," J. Phys. Chem. 100, 5794-5799 (1996)] of the critical size-temperature threshold of hotspots required for chemical ignition of solid explosives. The criterion, along with the CFEM capability to quantify the thermal-mechanical behavior of GXs and PBXs, allows the critical impact velocity for ignition, time to ignition, and critical input energy at ignition to be determined as functions of material composition, microstructure, and loading conditions. The applicability of the relation between the critical input energy (E) and impact velocity of James [H. R. James, "An extension to the critical energy criterion used to predict shock initiation thresholds," Propellants, Explos., Pyrotech. 21, 8-13 (1996)] for shock loading is examined, leading to a modified interpretation, which is sensitive to microstructure and loading condition. As an application, numerical studies are undertaken to evaluate the ignition threshold of granular high melting point eXplosive, octahydro-1,3,5,7-tetranitro-1,2,3,5-tetrazocine (HMX) and HMX/Estane PBX under loading with impact velocities up to 350 ms(-1) and strain rates up to 10(5) s(-1). Results show that, for the GX, the time to criticality (t(c)) is strongly influenced by initial porosity, but is insensitive to grain size. Analyses also lead to a quantification of the differences between the responses of the GXs and PBXs in terms of critical impact velocity for ignition, time to ignition, and critical input energy at ignition. Since the framework permits explicit tracking of the influences of microstructure, loading, and mechanical constraints, the calculations also show the effects of stress wave reflection and confinement condition on the ignition behaviors of GXs and PBXs. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4792001]
C1 [Barua, A.; Kim, S.; Zhou, M.] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.
[Horie, Y.] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
RP Barua, A (reprint author), Georgia Inst Technol, George W Woodruff Sch Mech Engn, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.
EM min.zhou@gatech.edu
FU Air Force Research Laboratory (AFRL) at the Eglin AFB in Florida;
Defense Threat Reduction Agency (DTRA)
FX The authors gratefully acknowledge support from the Air Force Research
Laboratory (AFRL) at the Eglin AFB in Florida and the Defense Threat
Reduction Agency (DTRA) (scientific officer: Dr. Suhithi Peiris).
Calculations are carried out on parallel computers at NAVO and the DPRL
at Georgia Tech.
NR 56
TC 13
Z9 14
U1 7
U2 66
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD FEB 14
PY 2013
VL 113
IS 6
AR 064906
DI 10.1063/1.4792001
PG 22
WC Physics, Applied
SC Physics
GA 091MO
UT WOS:000315054000096
ER
PT J
AU Guss, P
Guise, R
Yuan, D
Mukhopadhyay, S
O'Brien, R
Lowe, D
Kang, ZT
Menkara, H
Nagarkar, VV
AF Guss, Paul
Guise, Ronald
Yuan, Ding
Mukhopadhyay, Sanjoy
O'Brien, Robert
Lowe, Daniel
Kang, Zhitao
Menkara, Hisham
Nagarkar, Vivek V.
TI Lanthanum halide nanoparticle scintillators for nuclear radiation
detection
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID SPECTROSCOPY
AB Nanoparticles with sizes < 10nm were fabricated and characterized for their nanocomposite radiation detector properties. This work investigated the properties of several nanostructured radiation scintillators, in order to determine the viability of using scintillators employing nanostructured lanthanum trifluoride. Preliminary results of this investigation are consistent with the idea that these materials have an intrinsic response to nuclear radiation that may be correlated to the energy of the incident radiation. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4790867]
C1 [Guss, Paul; Guise, Ronald] Remote Sensing Lab, Las Vegas, NV 89193 USA.
[Yuan, Ding] Natl Secur Technol LLC, Los Alamos Operat, Los Alamos, NM 87544 USA.
[Mukhopadhyay, Sanjoy] Remote Sensing Lab Andrews, Andrews Afb, MD 20762 USA.
[O'Brien, Robert; Lowe, Daniel] Univ Nevada, Las Vegas, NV 89154 USA.
[Kang, Zhitao; Menkara, Hisham] Georgia Tech Res Inst, Atlanta, GA 30332 USA.
[Nagarkar, Vivek V.] RMD Inc, Watertown, MA 02472 USA.
RP Guss, P (reprint author), Remote Sensing Lab, POB 98521,M-S RSL 48, Las Vegas, NV 89193 USA.
EM gusspp@nv.doe.gov
OI Mukhopadhyay, Sanjoy/0000-0002-0319-5005
FU National Security Technologies, LLC [DE-AC52-06NA25946]; U.S. Department
of Energy; Site-Directed Research and Development Program; Nevada
National Security Site SDRD program
FX This manuscript has been authored by National Security Technologies,
LLC, under Contract No. DE-AC52-06NA25946 with the U.S. Department of
Energy and supported by the Site-Directed Research and Development
Program. The United States Government retains and the publisher, by
accepting the article for publication, acknowledges that the United
States Government retains a nonexclusive, paid-up, irrevocable,
world-wide license to publish or reproduce the published form of this
manuscript, or allow others to do so, for United States Government
purposes.; The authors acknowledge Vivek Nagarkar of RMD of Watertown,
Massachusetts, for the production of the nano-composite detectors, for
providing these detectors on loan to the Remote Sensing Laboratory, and
for his support and advice. The authors also acknowledge Denis Beller
and Anthony Santo Domingo of the University of Nevada, Las Vegas, for
their measurement of CeBr3 properties. This is a joint
research investigation between RSL and UNLV. The Nevada National
Security Site SDRD program provided support for this research.
NR 15
TC 7
Z9 7
U1 4
U2 30
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD FEB 14
PY 2013
VL 113
IS 6
AR 064303
DI 10.1063/1.4790867
PG 6
WC Physics, Applied
SC Physics
GA 091MO
UT WOS:000315054000065
ER
PT J
AU Vallabhaneni, AK
Qiu, B
Hu, JN
Chen, YP
Roy, AK
Ruan, XL
AF Vallabhaneni, Ajit K.
Qiu, Bo
Hu, Jiuning
Chen, Yong P.
Roy, Ajit K.
Ruan, Xiulin
TI Interfacial thermal conductance limit and thermal rectification across
vertical carbon nanotube/graphene nanoribbon-silicon interfaces
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID MOLECULAR-DYNAMICS; NANOTUBE ARRAYS; CONDUCTIVITY; GRAPHENE; STATE
AB Various models were previously used to predict interfacial thermal conductance of vertical carbon nanotube (CNT)-silicon interfaces, but the predicted values were several orders of magnitude off the experimental data. In this work, we show that the CNT filling fraction (the ratio of contact area to the surface area of the substrate) is the key to remedy this discrepancy. Using molecular dynamics, we have identified an upper limit of thermal interface conductance for C-Si interface which is around 1.25GW/m(2)K, corresponding to a 100% filling fraction of carbon nanotube or graphene nanoribbon on substrate. By extrapolating to low filling fraction (similar to 1%) that was measured in experiments, our predicted interfacial thermal conductance agrees with experimental data for vertical CNT arrays grown on silicon substrate (similar to 3MW/m(2) K). Meanwhile, thermal rectification of more than 20% has been found at these C-Si interfaces. We observed that this is strongly dependent on the interfacial temperature drop than the filling fraction. This new effect needs to be considered in future thermal interface materials design. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4790367]
C1 [Vallabhaneni, Ajit K.; Qiu, Bo; Ruan, Xiulin] Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
[Hu, Jiuning; Chen, Yong P.] Purdue Univ, Sch Elect Comp Engn, W Lafayette, IN 47907 USA.
[Hu, Jiuning; Chen, Yong P.; Ruan, Xiulin] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
[Chen, Yong P.] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA.
[Roy, Ajit K.; Ruan, Xiulin] USAF, Mat & Mfg Directorate, Res Lab, Dayton, OH 45433 USA.
RP Vallabhaneni, AK (reprint author), Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
EM ruan@purdue.edu
RI Ruan, Xiulin/C-6166-2009; Chen, Yong/K-7017-2012
OI Ruan, Xiulin/0000-0001-7611-7449; Chen, Yong/0000-0002-7356-4179
FU United States Air Force Office of Scientific Research
[FA9550-11-1-0057]; Cooling Technology Research Center (CTRC); Air Force
Summer Faculty Fellowship
FX This work was partially supported by the United States Air Force Office
of Scientific Research (Grant No.r FA9550-11-1-0057, Program manager Dr.
Kumar Jata) and the Cooling Technology Research Center (CTRC). X. L.
Ruan also acknowledges the support of Air Force Summer Faculty
Fellowship.
NR 34
TC 18
Z9 18
U1 2
U2 83
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD FEB 14
PY 2013
VL 113
IS 6
AR 064311
DI 10.1063/1.4790367
PG 6
WC Physics, Applied
SC Physics
GA 091MO
UT WOS:000315054000073
ER
PT J
AU Wang, C
Grillot, F
Kovanis, V
Even, J
AF Wang, Cheng
Grillot, Frederic
Kovanis, Vassilios
Even, Jacky
TI Rate equation analysis of injection-locked quantum cascade lasers
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID INTERSUBBAND SEMICONDUCTOR-LASERS; OPTICAL-INJECTION; LIGHT INJECTION;
RECENT PROGRESS; MODULATION; ENHANCEMENT; RESONANCE; SUBJECT
AB The modulation properties of optical injection-locked quantum cascade lasers (QCLs) are investigated theoretically via a simple low dimensional rate equation model. It is found that both strong injection level and positive optical frequency detuning increase the modulation bandwidth, while a large linewidth enhancement factor (LEF) contributes to the enhancement of the peak magnitude in the intensity modulation (IM) response. As opposed to conventional injection-locked interband lasers, it is demonstrated that no dip occurs in the QCL's IM response, which is beneficial for a series of broadband microwave photonic applications. Computations also show that the value of the LEF can critically modify both the locking and stability regions on the optical frequency detuning injection level map. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4790883]
C1 [Wang, Cheng; Even, Jacky] Univ Europeenne Bretagne, INSA, CNRS, FOTON, F-35708 Rennes, France.
[Grillot, Frederic] Ecole Natl Super Telecommun Bretagne, Telecom Paristech, CNRS, LTCI, F-75013 Paris, France.
[Kovanis, Vassilios] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Kovanis, Vassilios] Ohio State Univ, Electrosci Lab, Columbus, OH 43212 USA.
RP Wang, C (reprint author), Univ Europeenne Bretagne, INSA, CNRS, FOTON, 20 Ave Buttes Coesmes, F-35708 Rennes, France.
EM cheng.wang@insa-rennes.fr
RI even, jacky/C-6212-2008; Grillot, Frederic/N-5613-2014;
OI even, jacky/0000-0002-4607-3390; Kovanis, Vassilios/0000-0003-0697-8379
FU Electromagnetics portfolio of Dr. Arje Nachman of AFOSR; European Office
of Aeorospace Research and Development (EOARD) [FA8655-12-1-2093]; China
Scholarship Council
FX The authors would like to thank Professor Carlo Sirtori and Dr. S.
Barbieri of Universite Paris Diderot-Paris 7, France as well as
Professor Thomas Erneux from Brussels University Belgium for helpful
discussions. Dr. Vassilios Kovanis's work has been supported via the
Electromagnetics portfolio of Dr. Arje Nachman of AFOSR. Dr. Frederic
Grillot's work was supported in part by the European Office of
Aeorospace Research and Development (EOARD) under Grant No.
FA8655-12-1-2093. Cheng Wang's work was supported by China Scholarship
Council.
NR 29
TC 6
Z9 6
U1 1
U2 24
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD FEB 14
PY 2013
VL 113
IS 6
AR 063104
DI 10.1063/1.4790883
PG 6
WC Physics, Applied
SC Physics
GA 091MO
UT WOS:000315054000004
ER
PT J
AU Zhang, BG
Li, YJ
Liu, R
Pritchett, TM
Haley, JE
Sun, WF
AF Zhang, Bingguang
Li, Yunjing
Liu, Rui
Pritchett, Timothy M.
Haley, Joy E.
Sun, Wenfang
TI Extending the Bandwidth of Reverse Saturable Absorption in Platinum
Complexes Using Two-Photon-Initiated Excited-State Absorption
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE platinum(II) terpyridine complex; photophysics; excited-state
absorption; two-photon absorption; reverse saturable absorption;
nonlinear absorbing materials
ID PT-ETHYNYL COMPOUND; 2-PHOTON ABSORPTION; CROSS-SECTION; OPTICAL
NONLINEARITIES; ORGANIC-MOLECULES; PORPHYRIN DIMERS; PHOTOPHYSICS;
DERIVATIVES; DYES; PHTHALOCYANINES
AB Pt(II) complexes bearing 4-(7-(benzothiazol-2'-yl)-9,9-diethylfluoren-2-yl)-2,2':6',2 ''-terpyridine or 4-(7-(benzothiazol-2'-yl)-9,9-diethylfluoren-2-yl)ethynyl-2,2':6',2 ''-terpyridine ligand exhibit strong reverse saturable absorption in the visible spectral region and large two-photon initiated excited-state absorption in the near-IR region. They are promising broadband nonlinear absorbing materials from the visible to the near-IR region. The extended pi-conjugation in complex 2 that has a C C linker between the terpyridine ligand and the 4-(7-(benzothiazol-2'-yl)-9,9-diethylfluoren-2-yl) substituent significantly increases the two-photon absorption cross sections (sigma(2)), making it among the strongest of two-photon absorbing Pt(II) complexes.
C1 [Zhang, Bingguang; Li, Yunjing; Liu, Rui; Sun, Wenfang] N Dakota State Univ, Dept Chem & Biochem, Fargo, ND 58108 USA.
[Pritchett, Timothy M.] USA, Res Lab, AMSRD SEE M, Adelphi, MD 20783 USA.
[Haley, Joy E.] USAF, Mat & Mfg Directorate, Res Lab, Dayton, OH 45433 USA.
RP Sun, WF (reprint author), N Dakota State Univ, Dept Chem & Biochem, Fargo, ND 58108 USA.
EM Wenfang.Sun@ndsu.edu
RI Liu, Rui/G-3772-2014
FU Army Research Laboratory [W911NF-06-2-0032, W911NF-10-2-0055]; National
Science Foundation [CHE-0449598]
FX This work is partially supported by the Army Research Laboratory (Grants
W911NF-06-2-0032 and W911NF-10-2-0055). We also acknowledge the support
from the National Science Foundation (Grant CAREER CHE-0449598) for
partial support.
NR 43
TC 17
Z9 17
U1 4
U2 41
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD FEB 13
PY 2013
VL 5
IS 3
BP 565
EP 572
DI 10.1021/am3018724
PG 8
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 091WE
UT WOS:000315079700015
PM 23273050
ER
PT J
AU Ehlert, GJ
Galan, U
Sodano, HA
AF Ehlert, Gregory J.
Galan, Ulises
Sodano, Henry A.
TI Role of Surface Chemistry in Adhesion between ZnO Nanowires and Carbon
Fibers in Hybrid Composites
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE ZnO nanowires; fiber reinforced composite; functionalization; interface
ID HIGH-TEMPERATURE THERMOPLASTICS; NITRIC-ACID; INTERFACIAL INTERACTIONS;
HIERARCHICAL COMPOSITES; CHEMICAL-MODIFICATION; MOLECULAR-DYNAMICS;
NANOTUBES; PAN; REINFORCEMENT; INTERPHASE
AB Low interface strength is a persistent problem in composite materials and cascades to limit a variety of bulk material properties such as lamina shear strength. Whiskerization has long been pursued as a method to reinforce the interphase and improve both the single fiber interface strength as well as the bulk properties. Recent developments have shown that ZnO nanowire whiskerization can effectively improve the properties of a bulk composite without requiring the high temperatures that previous deposition processes needed. Although the efficacy of a ZnO nanowire interphase has been established, the mechanism for adhesion of the interphase to the fiber has not been identified. Specifically, the addition of the ZnO nanowires to the surface of the fibers requires that the ZnO nanowires have strong chemical adhesion to the fiber surface. This work will create a variety of chemical environments on the surface of the fibers through new and common chemical functionalization procedures and quantify the surface chemistry through X-ray photoelectron spectroscopy. The effect of fiber surface chemistry on the adhesion of the ZnO is assessed through single fiber fragmentation testing. The interface strength is found to strongly correlate with the concentration of ketone groups on the surface of the fibers. Following the experimental observations, liftoff of a ZnO crystal from a graphene surface was simulated with a variety of surface functionalizations. The computational models confirm the preference for ketone groups in promoting adhesion between ZnO and graphite.
C1 [Ehlert, Gregory J.; Galan, Ulises; Sodano, Henry A.] Univ Florida, Gainesville, FL 32611 USA.
[Galan, Ulises] Arizona State Univ, Sch Matter Transport & Energy, Tempe, AZ 85287 USA.
RP Ehlert, GJ (reprint author), USAF, Nonmetall Mat Div, Mat & Mfg Directorate, Res Lab, 2941 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM Gregory.ehlert.ctr@wpafb.af.mil
FU U.S. Army Research Office [W911NF0810382]; US Air Force Office of
Scientific Research [FA9550-09-1-0356]
FX The authors acknowledge funding U.S. Army Research Office (Award #
W911NF0810382) and the US Air Force Office of Scientific Research (Award
# FA9550-09-1-0356). The authors also acknowledge the use of the Arizona
State University Center for Solid State Science and University of
Florida Major Analytical Instrumentation Center.
NR 51
TC 23
Z9 23
U1 3
U2 79
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD FEB 13
PY 2013
VL 5
IS 3
BP 635
EP 645
DI 10.1021/am302060v
PG 11
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 091WE
UT WOS:000315079700024
PM 23281964
ER
PT J
AU Ford, C
Sladky, J
Sherman, P
Kochunov, P
McGuire, S
AF Ford, Caelan
Sladky, John
Sherman, Paul
Kochunov, Peter
McGuire, Stephen
TI Prevalence of Hyperintense White Matter Lesions in Very-Low-Pressure
Hypobaric Physiology Technicians
SO NEUROLOGY
LA English
DT Meeting Abstract
CT 65th Annual Meeting of the American-Academy-of-Neurology (AAN)
CY MAR 16-23, 2013
CL San Diego, CA
SP Amer Acad Neurol
C1 [Ford, Caelan; Sladky, John] San Antonio Mil Med Ctr, Ft Sam Houston, TX USA.
[Sherman, Paul] 59th Med Wing, Lackland AFB, TX USA.
[Kochunov, Peter] Univ Maryland, Sch Med, Baltimore, MD 21201 USA.
[McGuire, Stephen] Aerosp Med Consultat Div, Wright Patterson AFB, OH USA.
[McGuire, Stephen] Univ Texas Hlth Sci Ctr San Antonio, Dept Neurol, San Antonio, TX 78229 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0028-3878
EI 1526-632X
J9 NEUROLOGY
JI Neurology
PD FEB 12
PY 2013
VL 80
SU S
MA P06203
PG 1
WC Clinical Neurology
SC Neurosciences & Neurology
GA AB8VR
UT WOS:000332068604271
ER
PT J
AU Hsu, PS
Roy, S
Jiang, NB
Gord, JR
AF Hsu, Paul S.
Roy, Sukesh
Jiang, Naibo
Gord, James R.
TI Large-aperture, tapered fiber-coupled, 10-kHz particle-image velocimetry
SO OPTICS EXPRESS
LA English
DT Article
ID LASER-INDUCED-FLUORESCENCE; DELIVERY-SYSTEM; OPTICAL-FIBERS;
ILLUMINATION; PULSES; MODE; SPECTROSCOPY; INSTABILITY; SILICA; FLAMES
AB We demonstrate the design and implementation of a fiber-optic beam-delivery system using a large-aperture, tapered step-index fiber for high-speed particle-image velocimetry (PIV) in turbulent combustion flows. The tapered fiber in conjunction with a diffractive-optical-element (DOE) fiber-optic coupler significantly increases the damage threshold of the fiber, enabling fiber-optic beam delivery of sufficient nanosecond, 532-nm, laser pulse energy for high-speed PIV measurements. The fiber successfully transmits 1-kHz and 10-kHz laser pulses with energies of 5.3 mJ and 2 mJ, respectively, for more than 25 min without any indication of damage. It is experimentally demonstrated that the tapered fiber possesses the high coupling efficiency (similar to 80%) and moderate beam quality for PIV. Additionally, the nearly uniform output-beam profile exiting the fiber is ideal for PIV applications. Comparative PIV measurements are made using a conventionally (bulk-optic) delivered light sheet, and a similar order of measurement accuracy is obtained with and without fiber coupling. Effective use of fiber-coupled, 10-kHz PIV is demonstrated for instantaneous 2D velocity-field measurements in turbulent reacting flows. Proof-of-concept measurements show significant promise for the performance of fiber-coupled, high-speed PIV using a tapered optical fiber in harsh laser-diagnostic environments such as those encountered in gas-turbine test beds and the cylinder of a combustion engine. (C) 2013 Optical Society of America
C1 [Hsu, Paul S.; Roy, Sukesh; Jiang, Naibo] Spectral Energies LLC, Dayton, OH 45431 USA.
[Gord, James R.] USAF, Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
RP Hsu, PS (reprint author), Spectral Energies LLC, 5100 Springfield St,Suite 301, Dayton, OH 45431 USA.
EM sroy@woh.rr.com
FU Air Force Research Laboratory [FA8650-12-C-2200]; Air Force Office of
Scientific Research
FX The authors gratefully acknowledge useful discussions with Mr. Jacob
Schmidt of Spectral Energies, LLC. Funding for this research was
provided by the Air Force Research Laboratory under Contract No.
FA8650-12-C-2200 and by the Air Force Office of Scientific Research (Dr.
Chiping Li, Program Manager).
NR 27
TC 3
Z9 3
U1 3
U2 19
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD FEB 11
PY 2013
VL 21
IS 3
BP 3617
EP 3626
DI 10.1364/OE.21.003617
PG 10
WC Optics
SC Optics
GA 104KJ
UT WOS:000315991400108
PM 23481818
ER
PT J
AU Husaini, S
Shima, D
Ahirwar, P
Rotter, TJ
Hains, CP
Dang, T
Bedford, RG
Balakrishnan, G
AF Husaini, S.
Shima, D.
Ahirwar, P.
Rotter, T. J.
Hains, C. P.
Dang, T.
Bedford, R. G.
Balakrishnan, G.
TI Effect of antimony nano-scale surface-structures on a GaSb/AlAsSb
distributed Bragg reflector
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID THIN-FILMS; CRYSTALLIZATION
AB Effects of antimony crystallization on the surface of GaSb during low temperature molecular beam epitaxy growth are investigated. The geometry of these structures is studied via transmission electron and atomic force microscopies, which show the surface metal forms triangular-shaped, elongated nano-wires with a structured orientation composed entirely of crystalline antimony. By depositing antimony on a GaSb/AlAsSb distributed Bragg reflector, the field is localized within the antimony layer. Polarization dependent transmission measurements are carried out on these nano-structures deposited on a GaSb/AlAsSb distributed Bragg reflector. It is shown that the antimony-based structures at the surface favor transmission of light polarized perpendicular to the wires. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4792320]
C1 [Husaini, S.; Shima, D.; Ahirwar, P.; Rotter, T. J.; Hains, C. P.; Dang, T.; Bedford, R. G.; Balakrishnan, G.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Husaini, S (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM saima.husaini.ctr@wpafb.af.mil
RI Ahirwar, Pankaj/O-9413-2014
OI Ahirwar, Pankaj/0000-0002-1223-1848
FU AFOSR [LRIR 08RY08COR]; Air force Summer Faculty Fellowship Program
(SFFP) at the Electro-optic components branch (AFOSR) [FA9550-09-C-0114]
FX S.H., T.D., and R.B. acknowledge AFOSR, who has funded this research
through LRIR 08RY08COR. G.B. was supported by the Air force Summer
Faculty Fellowship Program (SFFP) at the Electro-optic components branch
(AFOSR Grant No. FA9550-09-C-0114).
NR 17
TC 0
Z9 0
U1 2
U2 14
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD FEB 11
PY 2013
VL 102
IS 6
AR 063108
DI 10.1063/1.4792320
PG 3
WC Physics, Applied
SC Physics
GA 091MH
UT WOS:000315053300079
ER
PT J
AU Brant, AT
Giles, NC
Halliburton, LE
AF Brant, A. T.
Giles, N. C.
Halliburton, L. E.
TI Insertion of lithium ions into TiO2 (rutile) crystals: An electron
paramagnetic resonance study of the Li-associated Ti3+ small polaron
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID HYPERFINE INTERACTIONS
AB Electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) are used to identify a Ti3+-Li+ complex in TiO2 crystals having the rutile structure. This defect consists of an interstitial Li+ ion adjacent to a substitutional Ti3+ ion (the unpaired electron on the Ti3+ ion provides charge compensation for the Li+ ion). The neutral Ti3+-Li+ complex is best described as a donor-bound small polaron and is similar in structure to the recently reported neutral fluorine and hydrogen donors in TiO2 (rutile). Lithium ions are diffused into the crystals at temperatures near 450 degrees C. Following the diffusion, an EPR spectrum containing groups of four closely spaced lines is observed at 36K without laser illumination. ENDOR data verify that the four lines within each group are due to a weak hyperfine interaction with one lithium nucleus. Spin-Hamiltonian parameters are obtained from the angular dependence of the EPR spectra. Principal values are 1.9688, 1.9204, and 1.9323 for the g matrix and -2.14, -2.20, and +3.44MHz for the Li-7 hyperfine matrix. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4790366]
C1 [Brant, A. T.; Giles, N. C.] USAF, Dept Engn Phys, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Halliburton, L. E.] W Virginia Univ, Dept Phys, Morgantown, WV 26505 USA.
RP Brant, AT (reprint author), USAF, Dept Engn Phys, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM Adam.Brant.ctr@afit.edu
FU National Research Council at the Air Force Institute of Technology;
National Science Foundation [DMR-0804352]
FX The authors wish to acknowledge helpful discussions with Shan Yang
during the initial phase of this project. One of the authors (A.T.B.)
thanks the National Research Council for the award of a Postdoctoral
Fellowship at the Air Force Institute of Technology. The research at
West Virginia University was supported by Grant No. DMR-0804352 from the
National Science Foundation.
NR 30
TC 9
Z9 9
U1 3
U2 57
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD FEB 7
PY 2013
VL 113
IS 5
AR 053712
DI 10.1063/1.4790366
PG 6
WC Physics, Applied
SC Physics
GA 087FH
UT WOS:000314746200041
ER
PT J
AU Emery, SB
Rider, KB
Little, BK
Lindsay, CM
AF Emery, Samuel B.
Rider, Keith B.
Little, Brian K.
Lindsay, C. Michael
TI Helium Droplet Assembled Nanocluster Films: Cluster Formation and
Deposition Rates
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID LIQUID-HELIUM; MAGNESIUM CLUSTERS; HE-4 CLUSTERS; SIZE; MOLECULES;
ATOMS; SPECTROSCOPY; GROWTH; DISTRIBUTIONS; EXPANSIONS
AB This article examines the formation of nanoclusters by superfluid helium droplet assembly and the rates at which they can be deposited. A model of this process is presented that takes into account the hydrodynamic properties of droplet nozzle, the helium droplet size distribution, the dopant incorporation and condensation process, and the transport and collision of the doped droplet beam with a substrate. The results of this model are validated against measured magnesium cluster deposition rates produced in a droplet beam over a range of nozzle pressures and temperatures. This effort illuminates the connection between cluster deposition and the hydrodynamic state of a helium droplet beam, as well as, demonstrates the feasibility and level of control that can exist in creating cluster-based films by helium droplet assisted cluster assembly.
C1 [Emery, Samuel B.; Rider, Keith B.; Little, Brian K.; Lindsay, C. Michael] USAF, Energet Mat Branch, Res Lab, Eglin AFB, FL 32542 USA.
RP Emery, SB (reprint author), USAF, Energet Mat Branch, Res Lab, 2306 Perimeter Rd, Eglin AFB, FL 32542 USA.
EM samuel.emery.ctr@eglin.af.mil; c.lindsay@us.af.mil
FU Air Force Office of Scientific Research [3002NW]; Air Force Research
Laboratories Nano Science and Technology STT Nanoenergetics Initiative
FX We would like to acknowledge the contributions of former team members
Rebecca Cleaver, Ethan Holt, and Justin Samuel for their efforts in
designing, constructing, and performing preliminary experiments on the
helium droplet instrument employed in these measurements. We would also
like to thank Jerry Boatz, Gary Douberly, Robert J. Hinde, and William
Lewis for their helpful discussions and input. This research was
performed while S.B.E, B.K.L, and K.B.R. held National Research Council
Postdoctoral and Senior Research Associateships at the Air Force
Research Laboratory. This work was supported by research grant 3002NW
from the Air Force Office of Scientific Research, Michael Berman Program
Manager. and also by the Air Force Research Laboratories Nano Science
and Technology STT Nanoenergetics Initiative.
NR 54
TC 9
Z9 9
U1 0
U2 28
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD FEB 7
PY 2013
VL 117
IS 5
BP 2358
EP 2368
DI 10.1021/jp310295h
PG 11
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 089JV
UT WOS:000314907700044
ER
PT J
AU Zhang, Z
Look, DC
Schifano, R
Johansen, KM
Svensson, BG
Brillson, LJ
AF Zhang, Z.
Look, D. C.
Schifano, R.
Johansen, K. M.
Svensson, B. G.
Brillson, L. J.
TI Process dependence of H passivation and doping in H-implanted ZnO
SO JOURNAL OF PHYSICS D-APPLIED PHYSICS
LA English
DT Article
ID ZINC-OXIDE; SHALLOW DONOR; BULK ZNO; HYDROGEN
AB We used depth-resolved cathodoluminescence spectroscopy (DRCLS), photoluminescence (PL) spectroscopy and temperature-dependent Hall-effect (TDHE) measurements to describe the strong dependence of H passivation and doping in H-implanted ZnO on thermal treatment. Increasing H implantation dose increases passivation of Zn and oxygen vacancy-related defects, while reducing deep level emissions. Over annealing temperatures of 100-400 degrees C at different times, 1 h annealing at 200 degrees C yielded the lowest DRCLS deep level emissions, highest TDHE carrier mobility, and highest near band-edge PL emission. These results describe the systematics of dopant implantation and thermal activation on H incorporation in ZnO and their effects on its electrical properties.
C1 [Zhang, Z.; Brillson, L. J.] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
[Look, D. C.] Wright State Univ, Semicond Res Ctr, Dayton, OH 45432 USA.
[Look, D. C.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Schifano, R.; Johansen, K. M.; Svensson, B. G.] Univ Oslo, Dept Phys, N-0316 Oslo, Norway.
[Brillson, L. J.] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA.
[Brillson, L. J.] Ohio State Univ, Ctr Mat Res, Columbus, OH 43210 USA.
RP Zhang, Z (reprint author), Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
EM zhang.720@osu.edu
RI Schifano, Ramon/S-3385-2016
OI Schifano, Ramon/0000-0002-6465-8851
FU National Science Foundation [DMR-0803276]; Norwegian Research Centre for
Solar Cell Technology, a Centre for Environment-friendly Energy Research
[193829]; Norwegian Research Council; AFOSR [FA9550-10-1-0079]; AFRL
[HC1047-05-D-4005]; Norwegian Research Council through the NANOMAT;
Norwegian Research Council through FRINATEK program
FX The authors gratefully acknowledge support from the National Science
Foundation Grant No DMR-0803276 (Charles Ying) and the Norwegian
Research Council through the NANOMAT and FRINATEK program. The work was
partly performed within The Norwegian Research Centre for Solar Cell
Technology (project number 193829), a Centre for Environment-friendly
Energy Research co-sponsored by the Norwegian Research Council and
research and industry partners in Norway. The work of DCL was performed
at Wright-Patterson Air Force Base partially under AFOSR Grant
FA9550-10-1-0079 (J Hwang) and AFRL Contract HC1047-05-D-4005 (D
Tomich). The authors wish to thank T A Cooper for the Hall-effect
measurements.
NR 46
TC 8
Z9 8
U1 2
U2 81
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0022-3727
J9 J PHYS D APPL PHYS
JI J. Phys. D-Appl. Phys.
PD FEB 6
PY 2013
VL 46
IS 5
AR 055107
DI 10.1088/0022-3727/46/5/055107
PG 7
WC Physics, Applied
SC Physics
GA 073OO
UT WOS:000313752600010
ER
PT J
AU Sergeev, E
Grach, S
Shindin, A
Mishin, E
Bernhardt, P
Briczinski, S
Isham, B
Broughton, M
LaBelle, J
Watkins, B
AF Sergeev, E.
Grach, S.
Shindin, A.
Mishin, E.
Bernhardt, P.
Briczinski, S.
Isham, B.
Broughton, M.
LaBelle, J.
Watkins, B.
TI Artificial Ionospheric Layers during Pump Frequency Stepping Near the
4th Gyroharmonic at HAARP
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID STIMULATED ELECTROMAGNETIC EMISSIONS; SPECTRA; PLASMA
AB We report on artificial descending plasma layers created in the ionosphere F region by high-power high-frequency (HF) radio waves from High-frequency Active Auroral Research Program at frequencies f(0) near the fourth electron gyroharmonic 4f(ce). The data come from concurrent measurements of the secondary escaping radiation from the HF-pumped ionosphere, also known as stimulated electromagnetic emission, reflected probing signals at f(0), and plasma line radar echoes. The artificial layers appeared only for injections along the magnetic field and f(0) > 4f(ce) at the nominal HF interaction altitude in the background ionosphere. Their average downward speed similar to 0.5 km/s holds until the terminal altitude where the local fourth gyroharmonic matches f(0). The total descent increases with the nominal offset f(0) - 4f(ce). DOI: 10.1103/PhysRevLett.110.065002
C1 [Sergeev, E.; Grach, S.; Shindin, A.] Radiophys Res Inst, Nizhnii Novgorod 603950, Russia.
[Sergeev, E.; Grach, S.; Shindin, A.] Lobachevsky State Univ Nizhny Novgorod, Nizhnii Novgorod 603950, Russia.
[Mishin, E.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Bernhardt, P.; Briczinski, S.] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA.
[Isham, B.] Interamer Univ, Dept Elect & Comp Engn, Bayamon, PR 00957 USA.
[Broughton, M.; LaBelle, J.] Dartmouth Coll, Dept Phys, Hanover, NH 03755 USA.
[Watkins, B.] Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA.
RP Sergeev, E (reprint author), Radiophys Res Inst, 25A-12 Bolshaya Pecherskaya St, Nizhnii Novgorod 603950, Russia.
RI Shindin, Alexey/R-8728-2016;
OI Shindin, Alexey/0000-0003-1242-5666; Grach, Savely/0000-0003-1726-4793
FU EOARD/AFOSR; RFBR [11-02-00125-a, 12-02-00513-a]; Ministry of Education
and Science of the Russian Federation [14.132.21.1434]; AFOSR
[W911NF-11-1-0217]; ONR [W911NF-11-1-0217]; ARO [W911NF-11-1-0217]
FX HAARP is a DoD program operated jointly by the U.S. Air Force and U.S.
Navy. E.S., S.G., and A.S. were supported by EOARD/AFOSR and RFBR Grants
No. 11-02-00125-a and No. 12-02-00513-a and the Ministry of Education
and Science of the Russian Federation, Project No. 14.132.21.1434. E.M.,
P.B. and S.B., and B.I. were supported by AFOSR, ONR, and ARO Grant No.
W911NF-11-1-0217, respectively.
NR 25
TC 13
Z9 15
U1 0
U2 11
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD FEB 5
PY 2013
VL 110
IS 6
AR 065002
DI 10.1103/PhysRevLett.110.065002
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 086MD
UT WOS:000314687300020
PM 23432261
ER
PT J
AU Clark, CD
Marshall, WJ
Thomas, RJ
AF Clark, C. D., III
Marshall, W. J.
Thomas, R. J.
TI Theoretical analysis of multiple-pulse thermal damage thresholds of the
retina
SO JOURNAL OF LASER APPLICATIONS
LA English
DT Article
DE thermal damage model; multiple-pulse; Arrhenius integral
ID LASER IRRADIATION; CELL-DAMAGE; TEMPERATURE; ABSORPTION; INJURY
AB In this paper, we present a theoretical analysis of multiple-pulse thermal damage thresholds based on the Arrhenius integral damage model. We consider the dependence of thresholds on both the number of pulses and the pulse spacing and show that the trends can be understood by considering the thermal relaxation time. The biological data that exists in the multiple-pulse thermal damage regime fits in with the model's predictions but does not validate them. We propose a simple experiment for validation and present a hypothetical scheme for adjusting the maximum permissible exposure limit for multiple pulses in the thermal damage regime. (C) 2013 Laser Institute of America.
C1 [Clark, C. D., III] TASC Inc, Ft Sam Houston, TX 78234 USA.
[Marshall, W. J.] Laser Safety Specialties, Wilmington, DE 19810 USA.
[Thomas, R. J.] USAF, Res Lab, Ft Sam Houston, TX 78234 USA.
RP Clark, CD (reprint author), TASC Inc, 4141 Petr Rd,Suite 4007, Ft Sam Houston, TX 78234 USA.
NR 32
TC 4
Z9 4
U1 0
U2 5
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 1042-346X
J9 J LASER APPL
JI J. Laser Appl.
PD FEB
PY 2013
VL 25
IS 1
AR UNSP 012005
DI 10.2351/1.4788755
PG 13
WC Materials Science, Multidisciplinary; Optics; Physics, Applied
SC Materials Science; Optics; Physics
GA 161JR
UT WOS:000320189600005
ER
PT J
AU Olson, DA
Katz, AW
Naguib, AM
Koochesfahani, MM
Rizzetta, DP
Visbal, MR
AF Olson, David A.
Katz, Alan W.
Naguib, Ahmed M.
Koochesfahani, Manoochehr M.
Rizzetta, Donald P.
Visbal, Miguel R.
TI On the challenges in experimental characterization of flow separation
over airfoils at low Reynolds number
SO EXPERIMENTS IN FLUIDS
LA English
DT Article
ID SCHEMES
AB Measurements and computations of the separation and reattachment locations are reported for the steady flow over a SD7003 airfoil at different angles of attack and chord Reynolds number in the range 2 x 10(4) - 4 x 10(4). The experiments are based on multi-line molecular tagging velocimetry, and the computations employ an implicit large eddy simulation approach. Comparisons of experimental results with current computations and previous experiments point to challenges involved in the experimental determination of the separation bubble characteristics. The results also underline the importance of the facility-dependent freestream turbulence level on the experimental data. The collective effect of experimental uncertainty and facility-dependent issues, examined systematically herein, appear to clarify the discrepancy among the various experimental and computational results. The findings also suggest that accurate characterization of the separation bubble over airfoils at low Reynolds number is more difficult than generally recognized and presents a challenge in comparing results between different experiments, and between experiments and computations. Moreover, this complicates the validation of computational data against experiments within this flow regime.
C1 [Olson, David A.; Katz, Alan W.; Naguib, Ahmed M.; Koochesfahani, Manoochehr M.] Michigan State Univ, E Lansing, MI 48824 USA.
[Rizzetta, Donald P.; Visbal, Miguel R.] USAF, Res Lab, Wright Patterson AFB, Dayton, OH 45433 USA.
RP Naguib, AM (reprint author), Michigan State Univ, E Lansing, MI 48824 USA.
EM naguib@egr.msu.edu
FU Air Force Research Laboratory (AFRL) through the Michigan/AFRL
Collaborative Center for Aeronautical Sciences; Air Force Office of
Scientific Research [FA9550-10-1-0342]
FX This work was supported by the Air Force Research Laboratory (AFRL)
through the Michigan/AFRL Collaborative Center for Aeronautical Sciences
and, in part, by the Air Force Office of Scientific Research grant
number FA9550-10-1-0342. We also thank Dr. Michael Ol of the AFRL at
Wright-Patterson Air Force Base for loaning us the SD7003 airfoil used
in these experiments.
NR 18
TC 6
Z9 6
U1 0
U2 14
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0723-4864
J9 EXP FLUIDS
JI Exp. Fluids
PD FEB
PY 2013
VL 54
IS 2
AR 1470
DI 10.1007/s00348-013-1470-1
PG 11
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA 133RE
UT WOS:000318156200025
ER
PT J
AU Selesnick, RS
Albert, JM
Starks, MJ
AF Selesnick, R. S.
Albert, J. M.
Starks, M. J.
TI Influence of a ground-based VLF radio transmitter on the inner electron
radiation belt
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID ZONE ELECTRONS; PRECIPITATION; FIELD
AB Observed signatures of electron precipitation from the inner radiation belt are shown to be consistent with the theory of resonant scattering by whistler-mode plasma waves, assuming the waves originate in VLF radio transmissions from the ground station NWC. The conclusion is based on a stochastic model of electron transport that includes pitch angle diffusion, radial diffusion, energy loss, and azimuthal drift. The wave scattering causes an increase in quasi-trapped electron intensity, forming the "wisp" signature, and a corresponding decrease in stably trapped intensity at low altitude. A smaller decrease at high altitude is expected to be obscured by inward radial diffusion. If NWC were shut down, the resulting increase in stably trapped electron intensity would be minimal. Citation: Selesnick, R. S., J. M. Albert, and M. J. Starks (2013), Influence of a ground-based VLF radio transmitter on the inner electron radiation belt, J. Geophys. Res. Space Physics, 118, 628-635, doi:10.1002/jgra.50095.
C1 [Selesnick, R. S.; Albert, J. M.; Starks, M. J.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM USA.
RP Selesnick, RS (reprint author), USAF, Res Lab, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM richard.selesnick@kirtland.af.mil
OI Albert, Jay/0000-0001-9494-7630
NR 18
TC 12
Z9 12
U1 0
U2 3
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD FEB
PY 2013
VL 118
IS 2
BP 628
EP 635
DI 10.1002/jgra.50095
PG 8
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 129RQ
UT WOS:000317860000005
ER
PT J
AU Hassan, E
Boles, J
Aono, H
Davis, D
Shyy, W
AF Hassan, Ez
Boles, John
Aono, Hikaru
Davis, Douglas
Shyy, Wei
TI Supersonic jet and crossflow interaction: Computational modeling
SO PROGRESS IN AEROSPACE SCIENCES
LA English
DT Review
DE Jet and crossflow interactions; Supersonic flows; Computational modeling
ID LARGE-EDDY SIMULATION; TRANSVERSE INJECTION FLOWFIELDS; IMPINGEMENT
HEAT-TRANSFER; SHOCK-CAPTURING SCHEMES; FILM-COOLING PHYSICS; ROUND JET;
VELOCITY-MEASUREMENTS; CYLINDRICAL HOLES; DETAILED ANALYSIS; TURBULENT
JET
AB The supersonic jet-in-crossflow problem which involves shocks, turbulent mixing, and large-scale vortical structures, requires special treatment for turbulence to obtain accurate solutions. Different turbulence modeling techniques are reviewed and compared in terms of their performance in predicting results consistent with the experimental data. Reynolds-averaged Navier Stokes (RANS) models are limited in prediction of fuel structure due to their inability to accurately capture unsteadiness In the flow. Large eddy simulation (LES) is not yet practical due to prohibitively large grid requirement near the wall. Hybrid RANS/LES can offer reasonable compromise between accuracy and efficiency. The hybrid models are based on various approaches such as explicit blending of RANS and LES, detached eddy simulation (DES), and filter-based multi-scale models. In particular, they can be used to evaluate the turbulent Schmidt number modeling techniques used in jet-in-crossflow simulations. Specifically, an adaptive approach can be devised by utilizing the information obtained from the resolved field to help assign the value of turbulent Schmidt number in the sub-filter field. The adaptive approach combined with the multi-scale model improves the results especially when highly refined grids are needed to resolve small structures involved in the mixing process. (C) 2012 Elsevier Ltd. All rights reserved.
C1 [Hassan, Ez; Shyy, Wei] Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA.
[Boles, John] Taitech Inc, Beavercreek, OH USA.
[Aono, Hikaru] Japan Aerosp Explorat Agcy JAXA, Sagamihara, Kanagawa, Japan.
[Hassan, Ez; Davis, Douglas] USAF, Res Lab, Fairborn, OH USA.
[Shyy, Wei] Hong Kong Univ Sci & Technol, Kowloon, Hong Kong, Peoples R China.
RP Shyy, W (reprint author), Hong Kong Univ Sci & Technol, Kowloon, Hong Kong, Peoples R China.
EM weishyy@ust.hk
OI Shyy, Wei/0000-0001-6670-5394
NR 109
TC 18
Z9 19
U1 4
U2 59
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0376-0421
J9 PROG AEROSP SCI
JI Prog. Aeosp. Sci.
PD FEB
PY 2013
VL 57
BP 1
EP 24
DI 10.1016/j.paerosci.2012.06.002
PG 24
WC Engineering, Aerospace
SC Engineering
GA 121OQ
UT WOS:000317254500001
ER
PT J
AU Sakaki, T
Schulte, PE
Cihan, A
Christ, JA
Illangasekare, TH
AF Sakaki, Toshihiro
Schulte, Paul E.
Cihan, Abdullah
Christ, John A.
Illangasekare, Tissa H.
TI Airflow Pathway Development as Affected by Soil Moisture Variability in
Heterogeneous Soils
SO VADOSE ZONE JOURNAL
LA English
DT Article
ID 3-DIMENSIONAL NUMERICAL-MODEL; VAPOR INTRUSION MODEL; HYDRAULIC
CONDUCTIVITY; RADON ENTRY; TRANSPORT; PRESSURE; BEHAVIOR; HOUSES;
SATURATION; SIMULATION
AB Understanding how lateral airflow pathways develop in the unsaturated zone is important to address problems dealing with intrusion of contaminants in the form of vapor into buildings and subsurface structures. One of the key factors that contribute to the formation of these vapor pathways is the spatial and temporal variation of soil moisture saturation. The soil moisture in the unsaturated zone is expected to be affected by the mass and temperature boundary conditions at the land surface. We performed highly controlled laboratory experiments in an intermediate-scale test tank to improve the basic understanding of the factors that contribute to development of such pathways. The tank was packed with different test sands in a layered configuration and the precipitation and thermal boundary conditions were controlled at the soil surface. A numerical model based on the COMSOL Multiphysics software was validated using the experimental data. This model was used to obtain insights into how the degree of subsurface heterogeneity affects air pathway development. The results showed that (i) soil moisture variations created by precipitation could significantly affect the development of dynamic airflow pathways, (ii) thermal flux at the soil surface does not significantly affect soil moisture deep in the formation and hence has a negligible effect on airflow pathways, and (iii) the capping effect created by water accumulating at soil layer interfaces results in more air of subsurface origin entering the building. Further study is needed, however, to examine the validity of these findings under more realistic soil and climate conditions.
C1 [Sakaki, Toshihiro; Schulte, Paul E.; Cihan, Abdullah; Illangasekare, Tissa H.] Colorado Sch Mines, Ctr Expt Study Subsurface Environm Proc, Golden, CO 80401 USA.
[Christ, John A.] USAF Acad, Dep Civil & Environm Engn, Colorado Springs, CO 80840 USA.
RP Sakaki, T (reprint author), NAGRA, Int Serv & Projects Div, Wettingen, Switzerland.
EM tsakaki@mines.edu
RI Cihan, Abdullah/D-3704-2015
FU Strategic Environmental Research and Development Program (SERDP)
[ER-1687]; U.S. Army RDECOM ARL Army Research Office [W911NF-04-1-0169]
FX This research was partly funded by Strategic Environmental Research and
Development Program (SERDP) ER-1687 and the U.S. Army RDECOM ARL Army
Research Office under Grant W911NF-04-1-0169. We also acknowledge the
associate editor, Insa Neuweiler of Leibniz Universitat, Hannover,
Germany; and three anonymous reviewers for their comments, which
significantly improved the paper.
NR 40
TC 1
Z9 1
U1 3
U2 32
PU SOIL SCI SOC AMER
PI MADISON
PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA
SN 1539-1663
J9 VADOSE ZONE J
JI Vadose Zone J.
PD FEB
PY 2013
VL 12
IS 1
DI 10.2136/vzj2011.0118
PG 14
WC Environmental Sciences; Soil Science; Water Resources
SC Environmental Sciences & Ecology; Agriculture; Water Resources
GA 127QK
UT WOS:000317713300002
ER
PT J
AU Aarons, LR
Balachandar, S
Horie, Y
AF Aarons, Lee R.
Balachandar, S.
Horie, Yasuyuki
TI The mixing of cohesive granular materials featuring a large size range
in the absence of gravity
SO POWDER TECHNOLOGY
LA English
DT Article
DE Mixing; Cohesion; Shear flow of powders; Discrete element simulation
ID RANDOM CLOSE PACKING; SHEAR FLOWS; ASSEMBLIES; SEGREGATION; STRESS;
MODEL; COMPUTER; SPHERES
AB We have studied the shear mixing of bidisperse collections of cohesive particles in an effort to develop models that would allow one to predict and control the homogeneity of particle composites. Our focus has been on the effects of interparticle cohesion and shear rate on the microstructure of particle composites. Furthermore, we have focused on particles that have a "large size range," specifically a 7:1 diameter ratio, such that homogeneous mixtures would include the small particles filling in the gaps formed between big particles, resulting in a correlation between the packing fraction and mixing quality. As a model problem, the cohesion resulting from the van der Waals force acting between particles was considered. Simulations were performed in which initially segregated bidisperse collections of particles were subjected to plane shear under constant applied stress as a method of mixing. Gravity was ignored in these simulations so that the different particles were not driven to different sides of the mixtures and the only hindrance to homogeneous mixing was cohesion. Simulations were performed with a variety of shear rates and particle cohesion strengths for both the large and small particles, and the homogeneity of the resultant mixtures was quantified using two distinct statistics: the estimated mean size of small-particle clusters and the spatial variance in the relative concentrations of the small and large particles. Microstructure images of the mixtures were used to provide additional qualitative measure of homogeneity as well as a measure of the relevance of the order statistics. These data suggested that the cohesiveness (Hamaker constant) of the small particles had the strongest influence on the mixture's homogeneity. When the small particles were not sufficiently cohesive, they did not significantly agglomerate, and so the resulting mixtures were relatively homogeneous over the range of shear rates and Hamaker constants of the big particles explored here. When the small particles were more cohesive, the small particles formed strong agglomerates and the mixtures become significantly inhomogeneous at lower shear rates. Somewhat surprisingly in these cases, better mixing was not achieved by simply making the large particles less cohesive. Rather, reducing the cohesiveness of the large particles far enough caused the large particles to pack more tightly, making the small-particle agglomerates unable to fit in between them, ultimately resulting in worse mixing. As such, the best mixing in these cases was achieved when the big particles were moderately cohesive. A correlation between solid volume fraction and homogeneity was not observed when particle cohesion was varied, as making either the small or large particles more cohesive led to a decrease in solid volume fraction, regardless of the effect on homogeneity. On the other hand, when homogeneity was found to increase with shear rate, so did the solid volume fraction. (C) 2012 Elsevier B.V. All rights reserved.
C1 [Aarons, Lee R.; Balachandar, S.] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA.
[Horie, Yasuyuki] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
RP Aarons, LR (reprint author), Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA.
EM aarons2@llnl.gov
FU U.S. Air Force Research Laboratory under Florida Institute for Research
in Energetics (FIRE) [FA8651-08-D-0108]
FX This work was funded by the U.S. Air Force Research Laboratory under
contract number FA8651-08-D-0108, as part of the Florida Institute for
Research in Energetics (FIRE). Some computational resources and work
space were provided by the Eglin Air Force Base.
NR 28
TC 3
Z9 3
U1 0
U2 18
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0032-5910
J9 POWDER TECHNOL
JI Powder Technol.
PD FEB
PY 2013
VL 235
BP 18
EP 26
DI 10.1016/j.powtec.2012.09.044
PG 9
WC Engineering, Chemical
SC Engineering
GA 105BA
UT WOS:000316039400003
ER
PT J
AU Li, X
Hong, S
Chakravarthy, VD
Temple, M
Wu, ZQ
AF Li, Xue
Hong, Steven
Chakravarthy, Vasu D.
Temple, Michael
Wu, Zhiqiang
TI Intercarrier Interference Immune Single Carrier OFDM via Magnitude-Keyed
Modulation for High Speed Aerial Vehicle Communication
SO IEEE TRANSACTIONS ON COMMUNICATIONS
LA English
DT Article
DE Intercarrier interference; single carrier OFDM; magnitude keyed
modulation
ID FREQUENCY OFFSET ESTIMATION; SELF-CANCELLATION SCHEME; DOMAIN
EQUALIZATION; SYSTEMS; ESTIMATOR; ICI
AB Orthogonal Frequency Division Multiplexing (OFDM) has been considered as a strong candidate for next generation wireless communication systems. Compared to traditional OFDM, Single Carrier OFDM (SC-OFDM) has demonstrated excellent bit error rate (BER) performance, as well as low peak to average power ratio (PAPR). Similar to other multi-carrier transmission technologies, SC-OFDM suffers significant performance degradation resulting from intercarrier interference (ICI) in high mobility environments. Existing techniques for OFDM can be directly adopted in SC-OFDM to improve performance, however, this improved performance comes at costs such as decreased throughput. In this paper, we analyze the effect of ICI on an SC-OFDM system and propose a novel modulation scheme. The proposed Magnitude-Keyed Modulation (MKM) modulation provides SC-OFDM system immunity to ICI and with an easy implementation it significantly outperforms OFDM, SC-OFDM and MC-CDMA systems with Phase Shift Keying (PSK) modulation and Quadrature Amplitude Modulation (QAM) in severe ICI environment. Analysis also illustrates the proposed SC-OFDM system with MKM modulation maintains low PAPR compared to traditional OFDM and SC-OFDM systems with PSK and QAM modulations. Simulation results for different modulation schemes in various ICI environments confirm the effectiveness of the proposed system.
C1 [Li, Xue; Wu, Zhiqiang] Wright State Univ, Dept Elect Engn, Dayton, OH 45435 USA.
[Hong, Steven] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA.
[Chakravarthy, Vasu D.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Temple, Michael] USAF, Dept Elect & Comp Engn, Inst Technol, Dayton, OH USA.
RP Li, X (reprint author), Wright State Univ, Dept Elect Engn, Dayton, OH 45435 USA.
EM li.68@wright.edu; hsiying@stanford.edu; vasu.chakravarthy@wpafb.af.mil;
michael.temple@afit.edu; zhiqiang.wu@wright.edu
FU National Science Foundation [0708469, 0737297, 0837677]; Wright Center
for Sensor System Engineering; Air Force Research Laboratory
FX This work is supported in part by National Science Foundation under
Grants No. 0708469, No. 0737297, No. 0837677, the Wright Center for
Sensor System Engineering, and the Air Force Research Laboratory.
NR 36
TC 10
Z9 10
U1 0
U2 7
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0090-6778
J9 IEEE T COMMUN
JI IEEE Trans. Commun.
PD FEB
PY 2013
VL 61
IS 2
BP 658
EP 668
DI 10.1109/TCOMM.2012.122112.110214
PG 11
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA 107GX
UT WOS:000316204300022
ER
PT J
AU Arehart, AR
Sasikumar, A
Rajan, S
Via, GD
Poling, B
Winningham, B
Heller, ER
Brown, D
Pei, Y
Recht, F
Mishra, UK
Ringel, SA
AF Arehart, A. R.
Sasikumar, A.
Rajan, S.
Via, G. D.
Poling, B.
Winningham, B.
Heller, E. R.
Brown, D.
Pei, Y.
Recht, F.
Mishra, U. K.
Ringel, S. A.
TI Direct observation of 0.57 eV trap-related RF output power reduction in
AlGaN/GaN high electron mobility transistors
SO SOLID-STATE ELECTRONICS
LA English
DT Article
DE GaN; Defect spectroscopy; Deep level transient spectroscopy (DLTS); Deep
level optical spectroscopy (DLOS); High electron mobility transistors
(HEMTs)
AB This paper reports direct evidence for trap-related RF output power loss in GaN high electron mobility transistors (HEMTs) grown by metal organic chemical vapor deposition (MOCVD) through increased concentration of a specific electron trap at E-C-0.57 eV that is located in the drain access region, as a function of accelerated life testing (ALT). The trap is detected by constant drain current deep level transient spectroscopy (CID-DLTS) and the CID-DLTS thermal emission time constant precisely matches the measured drain lag. Both drain lag and CID-DLTS measurements show this state to already exist in pre-stressed devices, which coupled with its strong increase in concentration as a function of stress in the absence of significant increases in concentrations of other detected traps, imply its role in causing degradation, in particular knee walkout. This study reveals E-C-0.57 eV trap concentration tracks degradation induced by ALT for MOCVD-grown HEMTs supplied by several commercial and university sources. The results suggest this defect has a common source and may be a key degradation pathway in AlGaN/GaN HEMTs and/or an indicator to predict device lifetime. (C) 2012 Elsevier Ltd. All rights reserved.
C1 [Arehart, A. R.; Sasikumar, A.; Rajan, S.; Ringel, S. A.] Ohio State Univ, Columbus, OH 43210 USA.
[Via, G. D.; Heller, E. R.] USAF, Sensors Directorate, Res Labs, Wright Patterson AFB, OH 45433 USA.
[Via, G. D.; Heller, E. R.] USAF, Mat Directorate, Res Labs, Wright Patterson AFB, OH 45433 USA.
[Poling, B.; Winningham, B.] Wyle Labs, Dayton, OH 45431 USA.
[Brown, D.; Pei, Y.; Recht, F.; Mishra, U. K.] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA.
RP Arehart, AR (reprint author), Ohio State Univ, Columbus, OH 43210 USA.
EM arehart.5@osu.edu
RI Rajan, Siddharth/B-9042-2008; Rajan, Siddharth/L-2028-2013
FU Office of Naval Research (ONR) [N00014-09-1-0242]; ONR DRIFT MURI
FX This work was supported by the Office of Naval Research (ONR) project
number N00014-09-1-0242 and the ONR DRIFT MURI.
NR 11
TC 37
Z9 37
U1 4
U2 48
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0038-1101
J9 SOLID STATE ELECTRON
JI Solid-State Electron.
PD FEB
PY 2013
VL 80
BP 19
EP 22
DI 10.1016/j.sse.2012.09.010
PG 4
WC Engineering, Electrical & Electronic; Physics, Applied; Physics,
Condensed Matter
SC Engineering; Physics
GA 102IJ
UT WOS:000315838000005
ER
PT J
AU Rao, R
Pierce, N
Liptak, D
Hooper, D
Sargent, G
Semiatin, SL
Curtarolo, S
Harutyunyan, AR
Maruyama, B
AF Rao, Rahul
Pierce, Neal
Liptak, David
Hooper, Daylond
Sargent, Gordon
Semiatin, S. Lee
Curtarolo, Stefano
Harutyunyan, Avetik R.
Maruyama, Benji
TI Revealing the Impact of Catalyst Phase Transition on Carbon Nanotube
Growth by in Situ Raman Spectroscopy
SO ACS NANO
LA English
DT Article
DE carbon nanotubes; CVD growth; phase transition; Raman spectroscopy; in
situ
ID CHEMICAL-VAPOR-DEPOSITION; NANOPARTICLES; IRON; SCATTERING; EVOLUTION;
DIFFUSION; GRAPHENE; SILICON; LIQUID; WATER
AB The physical state of the catalyst and its impact on the growth of single-walled carbon nanotubes (SWNTs) is the subject of a long-standing debate. We addressed it here using in situ Raman spectroscopy to measure Fe and Ni catalyst lifetimes during the growth of individual SWNTs across a wide range of temperatures (500-1400 degrees C). The temperature dependence of the Fe catalyst lifetimes underwent a sharp increase around 1100 C due to a solid-to-liquid phase transition. By comparing experimental results with the metal carbon phase diagrams, we prove that SWNTs can grow from solid and liquid phase-catalysts, depending on the temperature.
C1 [Rao, Rahul; Pierce, Neal; Liptak, David; Hooper, Daylond; Sargent, Gordon; Semiatin, S. Lee; Maruyama, Benji] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Rao, Rahul] CNR, Washington, DC 20001 USA.
[Pierce, Neal] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Liptak, David; Hooper, Daylond; Sargent, Gordon] UES Inc, Dayton, OH 45433 USA.
[Curtarolo, Stefano] Duke Univ, Durham, NC 27708 USA.
[Harutyunyan, Avetik R.] Honda Res Inst, Columbus, OH 43212 USA.
RP Rao, R (reprint author), Honda Res Inst, Columbus, OH 43212 USA.
EM rrao@honda-ri.com; benji.maruyama@wpafb.af.mil
RI SEMIATIN, SHELDON/E-7264-2017;
OI Rao, Rahul/0000-0002-6415-0185
FU Air Force Office of Scientific Research (AFOSR); National Research
Council
FX The authors gratefully acknowledge funding from the Air Force Office of
Scientific Research (AFOSR) and the National Research Council. We also
express our gratitude to Jun Lou for producing the pillar substrates and
thank Ohad Levy for useful discussions.
NR 38
TC 23
Z9 23
U1 5
U2 88
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1936-0851
J9 ACS NANO
JI ACS Nano
PD FEB
PY 2013
VL 7
IS 2
BP 1100
EP 1107
DI 10.1021/nn304064u
PG 8
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 099KA
UT WOS:000315618700026
PM 23343776
ER
PT J
AU Wilson, GR
Edwards, T
Corporan, E
Freerks, RL
AF Wilson, George R., III
Edwards, Tim
Corporan, Edwin
Freerks, Robert L.
TI Certification of Alternative Aviation Fuels and Blend Components
SO ENERGY & FUELS
LA English
DT Article
AB Aviation turbine engine fuel specifications are governed by ASTM International, formerly known as the American Society for Testing and Materials (ASTM) International, and the British Ministry of Defence (MOD). ASTM D1655 Standard Specification for Aviation Turbine Fuels and MOD Defence Standard 91-91 are the guiding specifications for this fuel throughout most of the world. Both of these documents rely heavily on the vast amount of experience in production and use of turbine engine fuels from conventional sources, such as crude oil, natural gas condensates, heavy oil, shale oil, and oil sands. Turbine engine fuel derived from these resources and meeting the above specifications has properties that are generally considered acceptable for fuels to be used in turbine engines. Alternative and synthetic fuel components are approved for use to blend with conventional turbine engine fuels after considerable testing. ASTM has established a specification for fuels containing synthesized hydrocarbons under D7566, and the MOD has included additional requirements for fuels containing synthetic components under Annex D of DS91-91. New turbine engine fuel additives and blend components need to be evaluated using ASTM D4054, Standard Practice for Qualification and Approval of New Aviation Turbine Fuels and Fuel Additives. This paper discusses these specifications and testing requirements in light of recent literature claiming that some biomass-derived blend components, which have been used to blend in conventional aviation fuel, meet the requirements for aviation turbine fuels as specified by ASTM and the MOD. The "Table 1" requirements listed in both D1655 and DS91-91 are predicated on the assumption that the feedstocks used to make fuels meeting these requirements are from approved sources. Recent papers have implied that commercial jet fuel can be blended with renewable components that are not hydrocarbons (such as fatty acid methyl esters). These are not allowed blend components for turbine engine fuels as discussed in this paper.
C1 [Wilson, George R., III] SW Res Inst, San Antonio, TX 78238 USA.
[Edwards, Tim; Corporan, Edwin] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Freerks, Robert L.] Rentech Inc, Denver, CO 80202 USA.
RP Freerks, RL (reprint author), Rentech Inc, 1331 17th St, Denver, CO 80202 USA.
EM rfreerks@rentk.com
NR 19
TC 13
Z9 15
U1 0
U2 35
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0887-0624
J9 ENERG FUEL
JI Energy Fuels
PD FEB
PY 2013
VL 27
IS 2
BP 962
EP 966
DI 10.1021/ef301888b
PG 5
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 096VD
UT WOS:000315431900041
ER
PT J
AU Abdel-Motaleb, I
Akula, B
Leedy, K
Cortez, R
AF Abdel-Motaleb, Ibrahim
Akula, Bhavya
Leedy, Kevin
Cortez, Rebecca
TI Oxygen effects on barium strontium titanate morphology and MOS device
performance
SO MATERIALS LETTERS
LA English
DT Article
DE Atomic force microscopy; Physical vapor deposition; Electrical
properties
ID THIN-FILMS; ELECTRICAL-PROPERTIES; DIELECTRIC-CONSTANT; PRESSURE; RF;
CAPACITORS; DEPOSITION; PLD
AB We report on oxygen's impact on the morphology of pulsed laser deposited barium strontium titanate (BST) thin films, and the influence of microstructure on fabricated BST capacitor's electrical properties. Variations in the O-2 chamber environment yielded distinct microstructures and dielectric constant values. The BST film deposited in a lower O-2 pressure environment was found to be polycrystalline with sharp grain boundaries, while a higher O-2 pressure environment film exhibited enhanced lateral growth and diffuse grain boundaries. The sample deposited in a higher O-2 pressure environment was found to exhibit low frequency characteristics in capacitance-voltage measurements even at 1 MHz. The sample deposited in a lower O-2 pressure environment was found to exhibit high frequency capacitance-voltage characteristics even at 1 kHz. The 1 mTorr O-2 environment devices yielded a dielectric constant of 432 compared with 32 for the 10 mTorr environment film. (C) 2012 Elsevier B.V. All rights reserved.
C1 [Abdel-Motaleb, Ibrahim; Akula, Bhavya] No Illinois Univ, Dept Elect Engn, De Kalb, IL 60115 USA.
[Leedy, Kevin] USAF, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Cortez, Rebecca] Union Coll, Dept Mech Engn, Schenectady, NY 12308 USA.
RP Cortez, R (reprint author), Union Coll, Dept Mech Engn, Schenectady, NY 12308 USA.
EM cortezr@union.edu
FU Northern Illinois University's Electrical Engineering Department; Union
College's Faculty Research Fund
FX Electron microscopy efforts were supported by Union College's Faculty
Research Fund. The authors thank Dr. Arnold Kiefer for XRD analysis.
This work was partially funded by Northern Illinois University's
Electrical Engineering Department.
NR 29
TC 3
Z9 3
U1 2
U2 30
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0167-577X
J9 MATER LETT
JI Mater. Lett.
PD FEB 1
PY 2013
VL 92
BP 389
EP 392
DI 10.1016/j.matlet.2012.11.003
PG 4
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 104YU
UT WOS:000316033500106
ER
PT J
AU Chattanathan, SA
Clement, TP
Kanel, SR
Barnett, MO
Chatakondi, N
AF Chattanathan, S. A.
Clement, T. P.
Kanel, S. R.
Barnett, M. O.
Chatakondi, N.
TI Remediation of Uranium-contaminated Groundwater by Sorption onto
Hydroxyapatite Derived from Catfish Bones
SO WATER AIR AND SOIL POLLUTION
LA English
DT Article
DE U(VI); Hydroxyapatite; Permeable reactive barrier; Groundwater
remediation
ID REMOVAL; ADSORPTION; APATITE; STABILITY; METALS; WASTE; OXIDE; PH
AB Hydroxyapatite (HA) was prepared from catfish bones, identified as catfish HA (CFHA), using mechanical and chemical treatment methods. CFHA was characterized by x-ray diffraction (XRD) and scanning electron microscope (SEM) techniques to confirm the presence of HA. The ability of CFHA to remove uranium (U(VI)) from aqueous phase was investigated using both batch and column experiments. Adsorption experiments in batch experiments were carried by varying pH, preparation temperature, and particle size. The data shows that the maximum adsorption occurred between pH5.5 and 7. The adsorption of U(VI) on CFHA was greater at 300 degrees C than at 100 degrees C. Batch data shows that the smallest particles, with maximum surface area, exhibited significant U (VI) removal efficiency. Column experiments were conducted using the smallest CFHA particles at different flow rates and breakthrough profiles were obtained. The scalability of the U(VI) removal process was tested by comparing the performances of columns packed with different CFHA. The results indicated that the reaction scales to the mass concentration of the reactants (CFHA and U(VI)). We also found that at pH7, the CFHA packed in the column has the potential to remove about 3.9 mg of U(VI) per gram. Our study shows that CFHA may be used in permeable reactive barriers for remediating U(VI)-contaminated groundwater plumes.
C1 [Chattanathan, S. A.; Clement, T. P.; Kanel, S. R.; Barnett, M. O.] Auburn Univ, Dept Civil & Environm Engn, Auburn, AL 36849 USA.
[Kanel, S. R.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Chatakondi, N.] Mississippi State Univ, USDA ARS, Catfish Genet Res Unit, Mississippi State, MS 39762 USA.
RP Kanel, SR (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM sushil.kanel.ctr@afit.edu
FU US Department of Energy at Auburn University [DE-FG02-06ER64213]
FX This work was supported by the US Department of Energy Grant No.
DE-FG02-06ER64213 at Auburn University.
NR 28
TC 5
Z9 5
U1 2
U2 44
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0049-6979
J9 WATER AIR SOIL POLL
JI Water Air Soil Pollut.
PD FEB
PY 2013
VL 224
IS 2
AR 1429
DI 10.1007/s11270-012-1429-5
PG 9
WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water
Resources
SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences;
Water Resources
GA 094RK
UT WOS:000315281300033
ER
PT J
AU Zherebtsov, SV
Dyakonov, GS
Salem, AA
Sokolenko, VI
Salishchev, GA
Semiatin, SL
AF Zherebtsov, S. V.
Dyakonov, G. S.
Salem, A. A.
Sokolenko, V. I.
Salishchev, G. A.
Semiatin, S. L.
TI Formation of nanostructures in commercial-purity titanium via
cryorolling
SO ACTA MATERIALIA
LA English
DT Article
DE Titanium; Cryorolling; Twinning; Microstructure formation; Nanostructure
ID HIGH-PRESSURE TORSION; MECHANICAL-PROPERTIES; GRAIN-BOUNDARIES;
ALPHA-TITANIUM; DEFORMATION; MICROSTRUCTURE; METALS; SIZE; REFINEMENT;
EVOLUTION
AB Microstructure evolution in commercial-purity titanium during plane-strain multipass rolling to a true thickness strain of 2.66 at 77 and 293 K was quantified. Deformation at both temperatures was accompanied by twinning. At 77 K, twinning was more extensive in terms of the fraction of twinned grains and the duration of the twinning stage. Rolling to a true thickness strain of 2.66 resulted in the formation of a microstructure with a grain/subgrain size of similar to 80 nm at 77 K or similar to 200 nm at 293 K. The contribution of various mechanisms to the strength of titanium following rolling at 77 and 293 K was analyzed quantitatively. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Zherebtsov, S. V.; Dyakonov, G. S.; Salishchev, G. A.] Belgorod State Univ, Lab Bulk Nanostruct Mat, Belgorod 308015, Russia.
[Salem, A. A.; Semiatin, S. L.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Salem, A. A.] Universal Technol Corp, Dayton, OH 45432 USA.
[Sokolenko, V. I.] Kharkov Inst Phys & Technol, Natl Sci Ctr, UA-61108 Kharkov, Ukraine.
RP Zherebtsov, SV (reprint author), Belgorod State Univ, Lab Bulk Nanostruct Mat, Pobeda 85, Belgorod 308015, Russia.
EM zherebtsov@bsu.edu.ru
RI Zherebtsov, Sergey/G-7435-2011; Salishchev, Gennady/G-4767-2016;
SEMIATIN, SHELDON/E-7264-2017;
OI Zherebtsov, Sergey/0000-0002-1663-429X; Salishchev,
Gennady/0000-0002-0815-3525; Dyakonov, Grigory/0000-0001-5389-5547;
Salem, Ayman/0000-0003-0907-1502
FU Federal Agency for Education, Russia [14.A18.21.0439]
FX This work was supported by the Federal Agency for Education, Russia;
Grant #14.A18.21.0439.
NR 38
TC 47
Z9 47
U1 1
U2 39
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD FEB
PY 2013
VL 61
IS 4
BP 1167
EP 1178
DI 10.1016/j.actamat.2012.10.026
PG 12
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 096UZ
UT WOS:000315431500014
ER
PT J
AU Sturrock, PA
Bertello, L
Fischbach, E
Javorsek, D
Jenkins, JH
Kosovichev, A
Parkhomov, AG
AF Sturrock, P. A.
Bertello, L.
Fischbach, E.
Javorsek, D., II
Jenkins, J. H.
Kosovichev, A.
Parkhomov, A. G.
TI An analysis of apparent r-mode oscillations in solar activity, the solar
diameter, the solar neutrino flux, and nuclear decay rates, with
implications concerning the Sun's internal structure and rotation, and
neutrino processes
SO ASTROPARTICLE PHYSICS
LA English
DT Article
DE Sun; Solar activity; Solar oscillations; Nuclear decays
ID POWER SPECTRUM ANALYSIS; HALF-LIFE MEASUREMENTS; SPACED DATA;
PERIODICITIES; SPACECRAFT; TACHOCLINE; MATTER
AB This article presents a comparative analysis of solar activity data, Mt Wilson diameter data, Super-Kamiokande solar neutrino data, and nuclear decay data acquired at the Lomonosov Moscow State University (LMSU). We propose that salient periodicities in all of these datasets may be attributed to r-mode oscillations. Periodicities in the solar activity data and in Super-Kamiokande solar neutrino data may be attributed to r-mode oscillations in the known tachocline, with normalized radius in the range 0.66-0.74, where the sidereal rotation rate is in the range 13.7-14.6 year(-1). We propose that periodicities in the Mt Wilson and LMSU data may be attributed to similar r-mode oscillations where the sidereal rotation rate is approximately 12.0 year(-1), which we attribute to a hypothetical "inner" tachocline separating a slowly rotating core from the radiative zone. We also discuss the possible role of the Resonant Spin Flavor Precession (RSFP) process, which leads to estimates of the neutrino magnetic moment and of the magnetic field strength in or near the solar core. (C) 2012 Elsevier B.V. All rights reserved.
C1 [Sturrock, P. A.] Stanford Univ, Ctr Space Sci & Astrophys, Stanford, CA 94305 USA.
[Bertello, L.] Natl Solar Observ, Tucson, AZ 85719 USA.
[Fischbach, E.; Jenkins, J. H.] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA.
[Javorsek, D., II] 411th Flight Test Squadron, Edwards AFB, CA 93524 USA.
[Jenkins, J. H.] Purdue Univ, Sch Nucl Engn, W Lafayette, IN 47907 USA.
[Kosovichev, A.] Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA.
[Parkhomov, A. G.] Moscow MV Lomonosov State Univ, Inst Time Nat Explorat, Moscow, Russia.
RP Sturrock, PA (reprint author), Stanford Univ, Ctr Space Sci & Astrophys, Stanford, CA 94305 USA.
EM sturrock@stanford.edu
OI Javorsek, Daniel/0000-0002-0329-4011
FU U.S. DOE [DE-AC02-76ER071428]
FX The work of EF was supported in part by U.S. DOE contract No.
DE-AC02-76ER071428. We are indebted to Taeil Bai and Joao Pulido for
helpful discussions concerning this project.
NR 47
TC 11
Z9 12
U1 0
U2 5
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0927-6505
J9 ASTROPART PHYS
JI Astropart Phys.
PD FEB
PY 2013
VL 42
BP 62
EP 69
DI 10.1016/j.astropartphys.2012.11.011
PG 8
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 095YW
UT WOS:000315371900007
ER
PT J
AU Shamberger, PJ
Reid, T
AF Shamberger, Patrick J.
Reid, Timothy
TI Thermophysical Properties of Potassium Fluoride Tetrahydrate from (243
to 348) K
SO JOURNAL OF CHEMICAL AND ENGINEERING DATA
LA English
DT Article
ID FUSION; HEAT
AB Potassium fluoride tetrahydrate is of interest as a thermal energy storage material, due to its large specific and volumetric enthalpy of fusion and its low melting temperature. Here, we report the thermophysical properties of solid and liquid potassium fluoride tetrahydrate at temperatures from (243 to 348) K and compare this compound to water and octadecane, two other potential thermal energy storage materials with similar melting temperatures. Furthermore, we present a modified potassium fluoride-water phase diagram and accurately determine the enthalpies of fusion and melting temperatures for potassium fluoride tetrahydrate, Delta H-fus = (246 +/- 2) J.g(-1) and T-fus = 291.6 K, and the potassium fluoride tetrahydrate-potassium fluoride dehydrate eutectic, Delta H-fus = (203 +/- 2) J.g(-1) and T-fus = 282.2 K.
C1 [Shamberger, Patrick J.; Reid, Timothy] USAF, Thermal Sci & Mat Branch, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Reid, Timothy] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
RP Shamberger, PJ (reprint author), USAF, Thermal Sci & Mat Branch, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM patrick.shamberger@wpafb.af.mil
RI Shamberger, Patrick/C-4795-2014
OI Shamberger, Patrick/0000-0002-8737-6064
FU Air Force Research Laboratory, Materials and Manufacturing Directorate
FX The authors thank the Air Force Research Laboratory, Materials and
Manufacturing Directorate for providing necessary financial support to
carry out the present work.
NR 26
TC 2
Z9 2
U1 3
U2 8
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0021-9568
J9 J CHEM ENG DATA
JI J. Chem. Eng. Data
PD FEB
PY 2013
VL 58
IS 2
BP 294
EP 300
DI 10.1021/je300854w
PG 7
WC Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical
SC Thermodynamics; Chemistry; Engineering
GA 093HL
UT WOS:000315182200014
ER
PT J
AU Agarwal, R
Anderson, C
Zarate, J
Ward, C
AF Agarwal, Ritu
Anderson, Catherine
Zarate, Jesus
Ward, Claudine
TI If We Offer it, Will They Accept? Factors Affecting Patient Use
Intentions of Personal Health Records and Secure Messaging
SO JOURNAL OF MEDICAL INTERNET RESEARCH
LA English
DT Article
DE personal health record; technology acceptance; secure messaging;
patient-centered care; employer sponsored PHR
ID SOCIAL COGNITIVE THEORY; PROVIDER RELATIONSHIP; INFORMATION-TECHNOLOGY;
ACTIVATION MEASURE; COMPUTER SKILLS; MEDICAL-RECORD; ADHERENCE;
INTERNET; CARE; COMMUNICATION
AB Background: Personal health records (PHRs) are an important tool for empowering patients and stimulating health action. To date, the volitional adoption of publicly available PHRs by consumers has been low. This may be partly due to patient concerns about issues such as data security, accuracy of the clinical information stored in the PHR, and challenges with keeping the information updated. One potential solution to mitigate concerns about security, accuracy, and updating of information that may accelerate technology adoption is the provision of PHRs by employers where the PHR is pre-populated with patients' health data. Increasingly, employers and payers are offering this technology to employees as a mechanism for greater patient engagement in health and well-being.
Objective: Little is known about the antecedents of PHR acceptance in the context of an employer sponsored PHR system. Using social cognitive theory as a lens, we theorized and empirically tested how individual factors (patient activation and provider satisfaction) and two environment factors (technology and organization) influence patient intentions to use a PHR among early adopters of the technology. In technology factors, we studied tool empowerment potential and value of tool functionality. In organization factors, we focused on communication tactics deployed by the organization during PHR rollout.
Methods: We conducted cross-sectional analysis of field data collected during the first 3 months post go-live of the deployment of a PHR with secure messaging implemented by the Air Force Medical Service at Elmendorf Air Force Base in Alaska in December 2010. A questionnaire with validated measures was designed and completed by 283 participants. The research model was estimated using moderated multiple regression.
Results: Provider satisfaction, interactions between environmental factors (communication tactics and value of the tool functionality), and interactions between patient activation and tool empowerment potential were significantly (P<.05) associated with behavioral intentions to use the PHR tool. The independent variables collectively explained 42% of the variance in behavioral intentions.
Conclusions: The study demonstrated that individual and environmental factors influence intentions to use the PHR. Patients who were more satisfied with their provider had higher use intentions. For patients who perceived the health care process management support features of the tool to be of significant value, communication tactics served to increase their use intentions. Finally, patients who believed the tool to be empowering demonstrated higher intentions to use, which were further enhanced for highly activated patients. The findings highlight the importance of communication tactics and technology characteristics and have implications for the management of PHR implementations. (J Med Internet Res 2013;15(2):e43) doi:10.2196/jmir.2243
C1 [Agarwal, Ritu] Univ Maryland, Robert H Smith Sch Business, Ctr Hlth Informat & Decis Syst, College Pk, MD 20817 USA.
[Anderson, Catherine] Univ Virginia, Sch Profess Educ, Fairfax, VA USA.
[Zarate, Jesus] Practice Leader Healthcare Solut, IMS Govt Solut, Falls Church, VA USA.
[Ward, Claudine] USAF, Hlth Promot AFMOA SGHC, Lackland AFB, TX USA.
RP Agarwal, R (reprint author), Univ Maryland, Robert H Smith Sch Business, Ctr Hlth Informat & Decis Syst, Van Munching Hall, College Pk, MD 20817 USA.
EM ragarwal@rhsmith.umd.edu
NR 55
TC 25
Z9 25
U1 5
U2 56
PU JMIR PUBLICATIONS, INC
PI TORONTO
PA 59 WINNERS CIRCLE, TORONTO, ON M4L 3Y7, CANADA
SN 1438-8871
J9 J MED INTERNET RES
JI J. Med. Internet Res.
PD FEB
PY 2013
VL 15
IS 2
AR e43
DI 10.2196/jmir.2243
PG 14
WC Health Care Sciences & Services; Medical Informatics
SC Health Care Sciences & Services; Medical Informatics
GA 098PY
UT WOS:000315562400015
PM 23470453
ER
PT J
AU Connor, MP
Barrera, JE
Eller, R
McCusker, S
O'Connor, P
AF Connor, Matthew P.
Barrera, Jose E.
Eller, Robert
McCusker, Scott
O'Connor, Peter
TI Total airway reconstruction
SO LARYNGOSCOPE
LA English
DT Article
DE Airway and voice modeling; surgical treatment of obstructive sleep
apnea; obstructive sleep apnea; rhinoplasty
ID OBSTRUCTIVE SLEEP-APNEA; LARYNGOMALACIA; SUPRAGLOTTOPLASTY; SURGERY;
RADIOFREQUENCY; PATIENT
AB We present a case of obstructive sleep apnea (OSA) that required multilevel surgical correction of the airway and literature review and discuss the role supraglottic laryngeal collapse can have in OSA. A 34-year-old man presented to a tertiary otolaryngology clinic for treatment of OSA. He previously had nasal and palate surgeries and a Repose tongue suspension. His residual apnea hypopnea index (AHI) was 67. He had a dysphonia associated with a true vocal cord paralysis following resection of a benign neck mass in childhood. He also complained of inspiratory stridor with exercise and intolerance to continuous positive airway pressure. Physical examination revealed craniofacial hypoplasia, full base of tongue, and residual nasal airway obstruction. On laryngoscopy, the paretic aryepiglottic fold arytenoid complex prolapsed into the laryngeal inlet with each breath. This was more pronounced with greater respiratory effort. Surgical correction required a series of operations including awake tracheostomy, supraglottoplasty, midline glossectomy, genial tubercle advancement, maxillomandibular advancement, and reconstructive rhinoplasty. His final AHI was 1.9. Our patient's supraglottic laryngeal collapse constituted an area of obstruction not typically evaluated in OSA surgery. In conjunction with treating nasal, palatal, and hypopharyngeal subsites, our patient's supraglottoplasty represented a key component of his success. This case illustrates the need to evaluate the entire upper airway in a complicated case of OSA. Laryngoscope, 2012
C1 [Connor, Matthew P.; Barrera, Jose E.; O'Connor, Peter] Wilford Hall USAF Med Ctr, Dept Otolaryngol Head & Neck Surg, Lackland AFB, TX USA.
RP Connor, MP (reprint author), 100 Lorenz Rd,Unit 1110, San Antonio, TX 78209 USA.
EM matthew.connor@amedd.army.mil
NR 18
TC 1
Z9 1
U1 2
U2 4
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0023-852X
J9 LARYNGOSCOPE
JI Laryngoscope
PD FEB
PY 2013
VL 123
IS 2
BP 537
EP 540
DI 10.1002/lary.23591
PG 4
WC Medicine, Research & Experimental; Otorhinolaryngology
SC Research & Experimental Medicine; Otorhinolaryngology
GA 090NH
UT WOS:000314985400054
PM 22965285
ER
PT J
AU Lee, T
Kim, JH
Semiatin, SL
Lee, CS
AF Lee, Taekyung
Kim, Jae Hyung
Semiatin, S. L.
Lee, Chong Soo
TI Internal-variable analysis of high-temperature deformation behavior of
Ti-6Al-4V: A comparative study of the strain-rate-jump and
load-relaxation tests
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Titanium alloys; Superplasticity; Mechanical characterization;
High-temperature deformation; Constitutive modeling; Grain boundary
sliding
ID SUPERPLASTIC DEFORMATION; HOT-WORKING; CONSTITUTIVE ANALYSIS;
MECHANICAL-BEHAVIOR; PLASTIC-FLOW; TRANSFORMED MICROSTRUCTURE;
QUANTITATIVE-ANALYSIS; COARSENING BEHAVIOR; ACCOMMODATION MODE;
STRESS-RELAXATION
AB The high-temperature deformation mechanisms of Ti-6Al-4V with either a fine or coarse alpha particle size were quantified using an internal-variable theory. For this purpose, strain rate jump tests (SRJT) and load relaxation tests (LRT) were conducted at 700, 800, and 900 degrees C to determine the strain rate sensitivity and to establish constitutive behavior. Stress-strain rate plots obtained by both SRJT and LRT were in good agreement with the theoretical predictions based on the activation of grain-matrix deformation and particle/grain-boundary sliding (P/GBS). The relative contribution of the two mechanisms varied with the microstructure, temperature, and strain rate, which affected the flow stress and strain rate sensitivity of the alloys. A clear difference in the strain rate sensitivity was observed depending on the experimental method. In all cases, the SRJT values were higher than those from the LRT. The discrepancy in strain rate sensitivity could be attributed to a variation in prestrain between the two methods. This variation resulted in microstructural differences, such as the fraction of alpha/beta interfaces and the misorientation of alpha grain boundaries, and hence affected the contribution of P/GBS to the overall deformation. (C) 2012 Elsevier B.V. All rights reserved.
C1 [Lee, Taekyung; Lee, Chong Soo] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 790784, South Korea.
[Kim, Jae Hyung; Lee, Chong Soo] Pohang Univ Sci & Technol POSTECH, Grad Inst Ferrous Technol, Pohang 790784, South Korea.
[Semiatin, S. L.] USAF, Res Lab, AFRL RXCM, Wright Patterson AFB, OH 45433 USA.
RP Lee, CS (reprint author), Pohang Univ Sci & Technol POSTECH, Grad Inst Ferrous Technol, Pohang 790784, South Korea.
EM cslee@postech.ac.kr
RI Lee, Chong Soo/F-5814-2013; SEMIATIN, SHELDON/E-7264-2017;
OI Lee, Taekyung/0000-0002-1589-3900
FU Air Force Office of Scientific Research and its Asian Office of
Aerospace Research and Development
FX The authors gratefully acknowledge the support of the Air Force Office
of Scientific Research and its Asian Office of Aerospace Research and
Development.
NR 36
TC 7
Z9 7
U1 3
U2 45
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD FEB 1
PY 2013
VL 562
BP 180
EP 189
DI 10.1016/j.msea.2012.11.023
PG 10
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 091UQ
UT WOS:000315075700024
ER
PT J
AU Gan, XT
Shiue, RJ
Gao, YD
Mak, KF
Yao, XW
Li, LZ
Szep, A
Walker, D
Hone, J
Heinz, TF
Englund, D
AF Gan, Xuetao
Shiue, Ren-Jye
Gao, Yuanda
Mak, Kin Fai
Yao, Xinwen
Li, Luozhou
Szep, Attila
Walker, Dennis, Jr.
Hone, James
Heinz, Tony F.
Englund, Dirk
TI High-Contrast Electrooptic Modulation of a Photonic Crystal Nanocavity
by Electrical Gating of Graphene
SO NANO LETTERS
LA English
DT Article
DE Graphene; optoelectronics; electro-optic modulation; photonic crystal
cavity
ID LIGHT-MATTER INTERACTION; OPTICAL MODULATOR; QUANTUM-DOT; PHOTODETECTOR;
ENHANCEMENT; TRANSISTOR; PLASMONICS
AB We demonstrate high-contrast electro-optic modulation of a photonic crystal nanocavity integrated with an electrically gated monolayer graphene. A silicon air-slot nanocavity provides strong overlap between the resonant optical field and graphene. Tuning the Fermi energy of the graphene layer to 0.85 eV enables strong control of its optical conductivity at telecom wavelengths, which allows modulation of cavity reflection in excess of 10 dB for a swing voltage of only 1.5 V. The cavity resonance at 1570 nm is found to undergo a shift in wavelength of nearly 2 nm, together with a 3-fold increase in quality factor. These observations enable a cavity-enhanced determination of graphene's complex optical sheet conductivity at different doping levels. Our simple device demonstrates the feasibility of high-contrast, low-power, and frequency-selective electro-optic modulators in graphene-integrated silicon photonic integrated circuits.
C1 [Gan, Xuetao; Shiue, Ren-Jye; Yao, Xinwen; Li, Luozhou; Heinz, Tony F.; Englund, Dirk] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA.
[Gao, Yuanda; Hone, James] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA.
[Mak, Kin Fai; Heinz, Tony F.] Columbia Univ, Dept Phys, New York, NY 10027 USA.
[Szep, Attila; Walker, Dennis, Jr.] USAF, Res Lab, Sensors Directorate, Dayton, OH 45433 USA.
[Englund, Dirk] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
RP Englund, D (reprint author), Columbia Univ, Dept Elect Engn, New York, NY 10027 USA.
EM englund@columbia.edu
RI Gan, Xuetao/L-4029-2013; Heinz, Tony/K-7797-2015
OI Heinz, Tony/0000-0003-1365-9464
FU Air Force Office of Scientific Research PECASE; National Science
Foundation [DMR-1106225]; U.S. Department of Energy, Office of Basic
Energy Sciences [DE-AC02-98CH10886]; Center for Re-Defining Photovoltaic
Efficiency Through Molecule Scale Control, an Energy Frontier Research
Center; U.S. Department of Energy, Office of Science, Office of Basic
Energy Sciences [DE-SC0001085]
FX Financial support was provided by the Air Force Office of Scientific
Research PECASE, supervised by Dr. Gernot Pomrenke. Additional support
was provided by the National Science Foundation through Grant
DMR-1106225. Fabrication of the PPC was carried out at the Center for
Functional Nanomaterials, Brookhaven National Laboratory, which is
supported by the U.S. Department of Energy, Office of Basic Energy
Sciences, under Contract No. DE-AC02-98CH10886. Device assembly,
including graphene transfer, and characterization was supported by the
Center for Re-Defining Photovoltaic Efficiency Through Molecule Scale
Control, an Energy Frontier Research Center funded by the U.S.
Department of Energy, Office of Science, Office of Basic Energy Sciences
under Award Number DE-SC0001085.
NR 37
TC 69
Z9 70
U1 12
U2 157
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
EI 1530-6992
J9 NANO LETT
JI Nano Lett.
PD FEB
PY 2013
VL 13
IS 2
BP 691
EP 696
DI 10.1021/nl304357u
PG 6
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 091WC
UT WOS:000315079500061
PM 23327445
ER
PT J
AU Zhdanov, BV
Knize, RJ
AF Zhdanov, Boris V.
Knize, Randy J.
TI Review of alkali laser research and development
SO OPTICAL ENGINEERING
LA English
DT Article
DE alkali lasers; optically pumped lasers; diode laser pump; diode pumped
alkali laser
ID CESIUM VAPOR LASER; COLLISION-INDUCED PROCESSES; INDUCED AMPLIFIED
EMISSION; PUMPED CS LASER; SODIUM VAPOR; DIODE ARRAY; POTASSIUM LASER;
RUBIDIUM LASER; METAL VAPOR; POWER
AB In this review we present an analysis of optically pumped alkali laser research and development from the first proposal in 1958 by Schawlow and Townes to the current state. In spite of the long history, real interest in alkali vapor lasers has appeared in the past decade, after the demonstration of really efficient lasing in Rb and Cs vapors in 2003 and the first successful power scaling experiments. This interest was stimulated by the possibility of using efficient diode lasers for optical pumping of the alkali lasers and by the fact that these lasers can produce a high quality and high power output beam from a single aperture. We present a review of the most important achievements in high power alkali laser research and development, discuss some problems existing in this field, and provide future perspectives in diode pumped alkali laser development. (c) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.52.2.021010]
C1 [Zhdanov, Boris V.; Knize, Randy J.] USAF Acad, Laser & Opt Res Ctr, Colorado Springs, CO 80840 USA.
RP Zhdanov, BV (reprint author), USAF Acad, Laser & Opt Res Ctr, 2354 Fairchild Dr,Suite 2A31, Colorado Springs, CO 80840 USA.
EM boris.zhdanov.ctr@usafa.edu
FU High Energy Laser Joint Technology Office (JTO); Air Force Office of
Scientific Research (AFOSR); Air Force Research Laboratory (AFRL)
FX The research projects performed by U.S. Air Force Academy and described
in this review were supported by the High Energy Laser Joint Technology
Office (JTO), Air Force Office of Scientific Research (AFOSR), and the
Air Force Research Laboratory (AFRL).
NR 70
TC 46
Z9 47
U1 3
U2 37
PU SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA
SN 0091-3286
EI 1560-2303
J9 OPT ENG
JI Opt. Eng.
PD FEB
PY 2013
VL 52
IS 2
AR 021010
DI 10.1117/1.OE.52.2.021010
PG 8
WC Optics
SC Optics
GA 092WX
UT WOS:000315154800014
ER
PT J
AU Crownover, BK
Covey, CJ
AF Crownover, Brian K.
Covey, Carlton J.
TI Hereditary Hemochromatosis
SO AMERICAN FAMILY PHYSICIAN
LA English
DT Article
ID LONG-TERM SURVIVAL; IRON-OVERLOAD; GENETIC HEMOCHROMATOSIS; NONINVASIVE
PREDICTION; MAMMARY CARCINOGENESIS; ASYMPTOMATIC SUBJECTS;
HEPATIC-FIBROSIS; LIVER-DISEASES; DIETARY IRON; METABOLISM
AB Hereditary hemochromatosis is an autosomal recessive disorder that disrupts the body's regulation of iron. It is the most common genetic disease in whites. Men have a 24-fold increased rate of iron-overload disease compared with women. Persons who are homozygous for the HFE gene mutation C282Y comprise 85 to 90 percent of phenotypically affected persons. End-organ damage or clinical manifestations of hereditary hemochromatosis occur in approximately 10 percent of persons homozygous for C282Y. Symptoms of hereditary hemochromatosis are nonspecific and typically absent in the early stages. If present; symptoms may include weakness, lethargy, arthralgias, and impotence. Later manifestations include arthralgias, osteoporosis, cirrhosis, hepatocellular cancer, cardiomyopathy, dysrhythmia, diabetes mellitus, and hypogonadism. Diagnosis requires confirmation of increased serum ferritin levels and transferrin saturation, with or without symptoms. Subtyping is based on genotypic expression. Serum ferritin measurement is the most useful prognostic indicator of disease severity. Liver biopsy is performed to stage the degree of fibrosis with severe ferritin elevation or transaminitis, or to diagnose nonclassical hereditary hemochromatosis in patients with other genetic defects. Treatment of hereditary hemochromatosis requires phlebotomy, and the frequency is guided by serial measurements of serum ferritin levels and transferrin saturation. Iron avidity can result from overtreatment. If iron avidity is not suspected, it may mimic undertreatment with persistently elevated transferrin saturation. Dietary modification is generally unnecessary. Universal screening for hereditary hemochromatosis is not recommended, but testing should be performed in first-degree relatives of patients with classical HFE-related hemochromatosis, those with evidence of active liver disease, and patients with abnormal iron study results. Screening for hepatocellular carcinoma is reserved for those with hereditary hemochromatosis and cirrhosis. (Am Earn Physician. 2013; 87(3) :183-190. Copyright (C) 2013 American Academy of Family Physicians.)
C1 [Crownover, Brian K.] Nellis Family Med Residency, Med Grp 99, Nellis AFB, NV USA.
[Covey, Carlton J.] Nellis Family Med Residency, Nellis AFB, NV USA.
RP Crownover, BK (reprint author), Nellis Family Med Residency Program, 4700 Las Vegas Blvd N, Nellis AFB, NV 89191 USA.
NR 46
TC 17
Z9 23
U1 1
U2 16
PU AMER ACAD FAMILY PHYSICIANS
PI KANSAS CITY
PA 8880 WARD PARKWAY, KANSAS CITY, MO 64114-2797 USA
SN 0002-838X
J9 AM FAM PHYSICIAN
JI Am. Fam. Physician
PD FEB 1
PY 2013
VL 87
IS 3
BP 183
EP 190
PG 8
WC Primary Health Care; Medicine, General & Internal
SC General & Internal Medicine
GA 086GA
UT WOS:000314670900008
PM 23418762
ER
PT J
AU Huang, DH
Gumbs, G
Roslyak, O
AF Huang, Danhong
Gumbs, Godfrey
Roslyak, Oleksiy
TI Effects of nonlocal plasmons in gapped graphene micro-ribbon array and
two-dimensional electron gas on near-field electromagnetic response in
the deep subwavelength regime
SO APPLIED OPTICS
LA English
DT Article
ID SPECTROSCOPY; TRANSPORT; TRANSITIONS; POLARITONS; DYNAMICS
AB A self-consistent theory involving Maxwell's equations and a density-matrix linear-response theory is solved for an electromagnetically coupled doped graphene micro-ribbon array (GMRA) and a quantum well (QW) electron gas sitting at an interface between a half-space of air and another half-space of a doped semiconductor substrate, which supports a surface-plasmon mode in our system. The coupling between a spatially modulated total electromagnetic (EM) field and the electron dynamics in a Dirac-cone of a graphene ribbon, as well as the coupling of the far-field specular and near-field higher-order diffraction modes, are included in the derived electron optical-response function. Full analytical expressions are obtained with nonlocality for the optical-response functions of a two-dimensional electron gas and a graphene layer with an induced bandgap, and are employed in our numerical calculations beyond the long-wavelength limit (Drude model). Both the near-field transmissivity and reflectivity spectra, as well as their dependence on different configurations of our system and on the array period, ribbon width, graphene chemical potential of QW electron gas and bandgap in graphene, are studied. Moreover, the transmitted E-field intensity distribution is calculated to demonstrate its connection to the mixing of specular and diffraction modes of the total EM field. An externally tunable EM coupling among the surface, conventional electron-gas and massless graphene intraband plasmon excitations is discovered and explained. Furthermore, a comparison is made between the dependence of the graphene-plasmon energy on the ribbon's width and chemical potential in this paper and the recent experimental observation given by [Nat. Nanotechnol. 6, 630 - 634 (2011)] for a GMRA in the terahertz-frequency range. (C) 2013 Optical Society of America
C1 [Huang, Danhong] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Gumbs, Godfrey; Roslyak, Oleksiy] CUNY Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA.
RP Huang, DH (reprint author), USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
EM danhong.huang@kirtland.af.mil
FU Air Force Office of Scientific Research (AFOSR)
FX This research was supported by the Air Force Office of Scientific
Research (AFOSR).
NR 51
TC 1
Z9 1
U1 2
U2 32
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1559-128X
EI 2155-3165
J9 APPL OPTICS
JI Appl. Optics
PD FEB 1
PY 2013
VL 52
IS 4
BP 755
EP 769
DI 10.1364/AO.52.000755
PG 15
WC Optics
SC Optics
GA 086LH
UT WOS:000314684600041
PM 23385917
ER
PT J
AU Symons, WA
Flynt, FL
Mendiola, C
Ortega, V
Higgins, RA
Velagaleti, GVN
AF Symons, Wendy A.
Flynt, Frederick L.
Mendiola, Christina
Ortega, Veronica
Higgins, Russell A.
Velagaleti, Gopalrao V. N.
TI Cytogenetic abnormalities precede morphological abnormalities in
developing malignant conditions: Report of 2 cases
SO EXPERIMENTAL AND MOLECULAR PATHOLOGY
LA English
DT Article
DE Follicular lymphoma; del(9)(q13q32); Diffuse large B-cell lymphoma;
BCL6; TCRAD; FISH; Morphology
ID REACTIVE LYMPHOID HYPERPLASIA; CHROMOSOMAL-ABNORMALITIES;
MYELODYSPLASIA; SUBTYPES
AB We previously hypothesized that cytogenetic abnormalities precede morphological abnormalities in developing malignant conditions. In this context we evaluated additional cases to further confirm that hypothesis. We report on 2 additional cases in which clonal cytogenetic abnormalities were observed in otherwise morphologically normal samples. Case 1 is a bone marrow from a 73 year old male with transformed follicular lymphoma (FL), while case 2 is a lymph node from a 53-year-old with lymphadenopathy, both referred to the cytogenetics laboratory for evaluation. A 73-year-old male presented with an enlarging left inguinal mass surrounding and obliterating the left iliac vein. A tissue core biopsy of the mass revealed recurrent high grade FL with diffuse large B-cell lymphoma (DLBCL). Examination of a random bone marrow biopsy of the adjacent left posterior iliac crest showed only mild hypercellularity (50%) and no evidence of malignancy, and the results were confirmed by flow cytometiy. Cytogenetic evaluation revealed an interstitial deletion, del (9)(q13q32). In case 2, morphologically the lymph node showed extensive paracortical hyperplasia with numerous eosinophils and no clear indication of a neoplastic process with no abnormal lymphoid population observed by flow. PCR studies for TCR gamma and IgH gene rearrangements were negative for clonality. Chromosome analysis demonstrated 47, XY,+add(1)(p22),t(3;14)(q27;q11.2)[13]/46,XY[7]. FISH studies showed a BCL6 gene rearrangement but no TCRAD rearrangement A subsequent inguinal lymph node biopsy showed DLBCL. These cases along with the other cases in the literature provide further evidence of genetic abnormalities preceding morphological abnormalities in developing malignant conditions. (C) 2012 Elsevier Inc. All rights reserved.
C1 [Symons, Wendy A.; Mendiola, Christina; Ortega, Veronica; Higgins, Russell A.; Velagaleti, Gopalrao V. N.] Univ Texas Hlth Sci Ctr San Antonio, Dept Pathol, San Antonio, TX 78229 USA.
[Flynt, Frederick L.] Wilford Hall USAF Med Ctr, San Antonio, TX USA.
RP Velagaleti, GVN (reprint author), Univ Texas Hlth Sci Ctr San Antonio, Dept Pathol, Mail Code 7750,7703 Floyd Curl Dr, San Antonio, TX 78229 USA.
EM velagaleti@uthscsa.edu
NR 16
TC 1
Z9 1
U1 0
U2 5
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0014-4800
J9 EXP MOL PATHOL
JI Exp. Mol. Pathol.
PD FEB
PY 2013
VL 94
IS 1
BP 98
EP 102
DI 10.1016/j.yexmp.2012.10.003
PG 5
WC Pathology
SC Pathology
GA 090UW
UT WOS:000315006500015
PM 23064050
ER
PT J
AU Andreev, AD
Hendricks, KJ
AF Andreev, Andrey D.
Hendricks, Kyle J.
TI Multicavity Magnetron With the "Rodded" Quasi-Metamaterial Cathode
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Cathode priming; computer simulations; metamaterial structures;
relativistic magnetron
ID IN-CELL SIMULATION; FAST OSCILLATION STARTUP; RELATIVISTIC MAGNETRON;
TRANSPARENT CATHODE; MODE; PERFORMANCE; IMPROVEMENT; EMISSION
AB We report on the use of the "rodded" or the longitudinally oriented metal-thin-wire structure as the explosive-emission cathode in high-power multicavity magnetrons. The rodded structure is transparent to the time-varying induced electric field E-1 oscillating orthogonally to the individual rods or wires of the structure. The rods (wires) are longitudinally oriented, i.e., along the magnetron axis and parallel to the external dc axial magnetic field H-0. The mode pattern established within the magnetron resonant cavity corresponds to one of the TE-like cavity modes of the magnetron operation. This allows defining the rodded structure as the quasi-metamaterial (i.e., not-entirely-metamaterial) structure. Particle-in-cell simulations of the U. S. Air Force Research Laboratory's six-cavity (AFRL-A6) L-band magnetron demonstrate that the rodded quasi-metamaterial cathode allows the magnetron to much more faster select the desired 2 pi/3 magnetron operating mode within the broader range of the input operating parameters (from 130 to 200 kV at 0.15 T), as compared with the same magnetron working with the traditional smooth cylindrical cathode (from 140 to 160 kV at 0.15 T).
C1 [Andreev, Andrey D.] Raytheon Missile Syst, Raytheon Ktech, Adv Secur & Directed Energy Syst, Directed Energy Div, Albuquerque, NM 87123 USA.
[Hendricks, Kyle J.] USAF, High Power Microwave Div, Directed Energy Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
RP Andreev, AD (reprint author), Raytheon Missile Syst, Raytheon Ktech, Adv Secur & Directed Energy Syst, Directed Energy Div, Albuquerque, NM 87123 USA.
NR 40
TC 1
Z9 1
U1 1
U2 5
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD FEB
PY 2013
VL 41
IS 2
BP 400
EP 407
DI 10.1109/TPS.2013.2238558
PG 8
WC Physics, Fluids & Plasmas
SC Physics
GA 090JG
UT WOS:000314974700020
ER
PT J
AU Pohlman, MR
Greendyke, RB
AF Pohlman, Mitchell R.
Greendyke, Robert B.
TI Parametric Analysis of Pylon-Aided Fuel Injection in Scramjet Engines
SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE
ASME
LA English
DT Article
AB The current study investigates means to increase the efficiency of fuel-air mixing into supersonic flow upstream of a flame holding cavity. Previous work has shown much promise in increasing the penetration and mixing of a fuel-air mixture into the freestream by injecting fuel behind small triangular pylons. The current paper examines 21 triangular pylons of varying widths, heights, and lengths with a computational fluid dynamics (CFD) performance analysis. Increasing the height of the pylons increased the penetration, flammable fuel plume area, and floor gap. Variations in pylon length had no discernible impact on the fuel-air mixing metrics. Aerodynamic loses were minimal for all pylon configurations and did not correlate to the absolute size of the pylons tested. [DOI: 10.1115/1.4007735]
C1 [Pohlman, Mitchell R.] USAF, Flutter Flight Test Team Lead, SEEK EAGLE Off, Carriage Mech Div, Eglin AFB, FL 32542 USA.
[Greendyke, Robert B.] USAF, Dept Aeronaut & Astronaut, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Pohlman, MR (reprint author), USAF, Flutter Flight Test Team Lead, SEEK EAGLE Off, Carriage Mech Div, 205 W D Ave, Eglin AFB, FL 32542 USA.
NR 12
TC 3
Z9 3
U1 1
U2 13
PU ASME
PI NEW YORK
PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0742-4795
J9 J ENG GAS TURB POWER
JI J. Eng. Gas. Turbines Power-Trans. ASME
PD FEB
PY 2013
VL 135
IS 2
AR 024501
DI 10.1115/1.4007735
PG 5
WC Engineering, Mechanical
SC Engineering
GA 087FQ
UT WOS:000314747100016
ER
PT J
AU Parco, JE
Levy, DA
AF Parco, James E.
Levy, David A.
TI Policy and Paradox: Grounded Theory at the Moment of DADT Repeal
SO JOURNAL OF HOMOSEXUALITY
LA English
DT Article
DE Don't Ask Don't Tell; DADT; oral history; interviews; military culture;
LBGT; service members; contradiction; gay policy; grounded theory
ID GAY BAN UNDERMINE; ORAL-HISTORY; US MILITARY; DONT TELL; HOMOSEXUALS;
ASK
AB Through a mixed-methods approach of oral history and grounded theory, we report on a study investigating the effects of the U.S. military's Don't Ask, Don't Tell policy on active-duty service members at the moment of transition to open service. A stratified, snowball sample of lesbian, gay, bisexual, and queer (LGBQ) service members (n = 17) from across all branches of the armed services were interviewed within two weeks of repeal (September 20, 2011). We find evidence that DADT was implicated in the structuring of military culture in terms of five irreconcilable contradictions: values, heroism, wartime, control, and silence. Military culture had moved in the direction of acceptance of LGBQ service members long before repeal, without the recognition of many leaders who had entered military service decades earlier.
C1 [Parco, James E.] Colorado Coll, Dept Econ & Business, Colorado Springs, CO 80903 USA.
[Levy, David A.] USAF Acad, Dept Management, Colorado Springs, CO 80840 USA.
RP Parco, JE (reprint author), 14 E Cache La Poudre St, Colorado Springs, CO 80903 USA.
EM jim.parco@coloradocollege.edu
NR 45
TC 2
Z9 2
U1 0
U2 1
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 0091-8369
J9 J HOMOSEXUAL
JI J. Homosex.
PD FEB 1
PY 2013
VL 60
IS 2-3
SI SI
BP 356
EP 380
DI 10.1080/00918369.2013.744925
PG 25
WC Psychology, Multidisciplinary; Social Sciences, Interdisciplinary
SC Psychology; Social Sciences - Other Topics
GA 089NL
UT WOS:000314917200012
PM 23414277
ER
PT J
AU Packard, GA
AF Packard, Gary A., Jr.
TI Unfriendly Fire: How the Gay Ban Undermines the Military and Weakens
America
SO JOURNAL OF HOMOSEXUALITY
LA English
DT Book Review
C1 [Packard, Gary A., Jr.] USAF Acad, Dept Behav Sci & Leadership, Colorado Springs, CO 80840 USA.
RP Packard, GA (reprint author), USAF Acad, Dept Behav Sci & Leadership, Colorado Springs, CO 80840 USA.
EM gary.packard@usafa.edu
NR 1
TC 0
Z9 0
U1 0
U2 1
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 0091-8369
J9 J HOMOSEXUAL
JI J. Homosex.
PD FEB 1
PY 2013
VL 60
IS 2-3
SI SI
BP 458
EP 461
DI 10.1080/00918369.2013.744934
PG 4
WC Psychology, Multidisciplinary; Social Sciences, Interdisciplinary
SC Psychology; Social Sciences - Other Topics
GA 089NL
UT WOS:000314917200017
ER
PT J
AU Mortensen, DR
AF Mortensen, Daniel R.
TI Attitudes Aren't Free: Thinking Deeply About Diversity in the US Armed
Forces
SO JOURNAL OF HOMOSEXUALITY
LA English
DT Book Review
C1 [Mortensen, Daniel R.] USAF, Res Inst, Maxwell AFB, AL USA.
RP Mortensen, DR (reprint author), USAF, Res Inst, Maxwell AFB, AL USA.
EM Daniel.mortensen@maxwell.af.mil
NR 1
TC 0
Z9 0
U1 0
U2 1
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 0091-8369
J9 J HOMOSEXUAL
JI J. Homosex.
PD FEB 1
PY 2013
VL 60
IS 2-3
SI SI
BP 462
EP 464
DI 10.1080/00918369.2013.744935
PG 3
WC Psychology, Multidisciplinary; Social Sciences, Interdisciplinary
SC Psychology; Social Sciences - Other Topics
GA 089NL
UT WOS:000314917200018
ER
PT J
AU Samuels, SM
AF Samuels, Steven M.
TI How We Won: Progressive Lessons from the Repeal of "Don't Ask, Don't
Tell"
SO JOURNAL OF HOMOSEXUALITY
LA English
DT Book Review
C1 [Samuels, Steven M.] USAF Acad, Dept Behav Sci & Leadership, Colorado Springs, CO 80840 USA.
RP Samuels, SM (reprint author), USAF Acad, Dept Behav Sci & Leadership, Colorado Springs, CO 80840 USA.
EM Steven.Samuels@usafa.edu
NR 1
TC 0
Z9 0
U1 0
U2 0
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 0091-8369
J9 J HOMOSEXUAL
JI J. Homosex.
PD FEB 1
PY 2013
VL 60
IS 2-3
SI SI
BP 474
EP 477
DI 10.1080/00918369.2013.744939
PG 4
WC Psychology, Multidisciplinary; Social Sciences, Interdisciplinary
SC Psychology; Social Sciences - Other Topics
GA 089NL
UT WOS:000314917200021
PM 23414286
ER
PT J
AU McClung, AJW
Tandon, GP
Baur, JW
AF McClung, Amber J. W.
Tandon, Gyaneshwar P.
Baur, Jeffery W.
TI Deformation rate-, hold time-, and cycle-dependent shape-memory
performance of Veriflex-E resin
SO MECHANICS OF TIME-DEPENDENT MATERIALS
LA English
DT Article
DE Shape memory polymer; Shape memory cycle; Deformation rate dependence;
Stress relaxation
ID POLYURETHANE SERIES; POLYMERS; BEHAVIOR; COMPOSITES; TEMPERATURE; FILM
AB Shape-memory polymers have attracted great interest in recent years for application in reconfigurable structures (for instance morphing aircraft, micro air vehicles, and deployable space structures). However, before such applications can be attempted, the mechanical behavior of the shape-memory polymers must be thoroughly understood. The present study represents an assessment of viscous effects during multiple shape-memory cycles of Veriflex-E, an epoxy-based, thermally triggered shape-memory polymer resin. The experimental program is designed to explore the influence of multiple thermomechanical cycles on the shape-memory performance of Veriflex-E. The effects of the deformation rate and hold times at elevated temperature on the shape-memory behavior are also investigated.
C1 [McClung, Amber J. W.; Tandon, Gyaneshwar P.; Baur, Jeffery W.] USAF, Res Lab, Mat & Mfg Directorate, Dayton, OH 45433 USA.
[McClung, Amber J. W.] CNR, Washington, DC 20418 USA.
[Tandon, Gyaneshwar P.] Univ Dayton Res Ins, Dayton, OH 45469 USA.
RP McClung, AJW (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Dayton, OH 45433 USA.
EM McClungA2@asme.org
NR 17
TC 18
Z9 18
U1 3
U2 29
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1385-2000
EI 1573-2738
J9 MECH TIME-DEPEND MAT
JI Mech. Time-Depend. Mater.
PD FEB
PY 2013
VL 17
IS 1
BP 39
EP 52
DI 10.1007/s11043-011-9157-6
PG 14
WC Mechanics; Materials Science, Characterization & Testing
SC Mechanics; Materials Science
GA 089GZ
UT WOS:000314900300004
ER
PT J
AU Poggie, J
Adamovich, I
Bisek, N
Nishihara, M
AF Poggie, J.
Adamovich, I.
Bisek, N.
Nishihara, M.
TI Numerical simulation of nanosecond-pulse electrical discharges
SO PLASMA SOURCES SCIENCE & TECHNOLOGY
LA English
DT Article
ID SEPARATION CONTROL; CROSS-SECTIONS; FLOW-CONTROL; AIR; NITROGEN;
MIXTURES; OXYGEN; FLUID; IONIZATION; GENERATION
AB Recent experiments with a nanosecond-pulse, dielectric barrier discharge at the stagnation point of a Mach 5 cylinder flow have demonstrated the formation of weak shock waves near the electrode edge, which propagate upstream and perturb the bow shock. This is a promising means of flow control, and understanding the detailed physics of the conversion of electrical energy into gas motion will aid in the design of efficient actuators based on the concept. In this work, a simplified configuration with planar symmetry was chosen as a vehicle to develop a physics-based model of nanosecond-pulse discharges, including realistic air kinetics, electron energy transport, and compressible bulk gas flow. A reduced plasma kinetic model (23 species and 50 processes) was developed to capture the dominant species and reactions for energy storage and thermalization in the discharge. The kinetic model included electronically and vibrationally excited species, and several species of ions and ground state neutrals. The governing equations included the Poisson equation for the electric potential, diffusion equations for each neutral species, conservation equations for each charged species, and mass-averaged conservation equations for the bulk gas flow. The results of calculations with this model highlighted the path of energy transfer in the discharge. At breakdown, the input electrical energy was transformed over a time scale on the order of 1 ns into chemical energy of ions, dissociation products, and vibrationally and electronically excited particles. About 30% of this energy was subsequently thermalized over a time scale of 10 mu s. Since the thermalization time scale was faster than the acoustic time scale, the heat release led to the formation of weak shock waves originating near the sheath edge, consistent with experimental observations. The computed translational temperature rise (40 K) and nitrogen vibrational temperature rise (370 K) were of the same order of magnitude as experimental measurements (50 K and 500 K, respectively), and the approach appears promising for future multi-dimensional calculations. The effectiveness of flow control actuators based on nanosecond-pulse, dielectric barrier discharges is seen to depend crucially on the rapid thermalization of input energy, in particular the rate of quenching of excited electronic states and the rate of electron-ion recombination.
C1 [Poggie, J.; Bisek, N.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Adamovich, I.; Nishihara, M.] Ohio State Univ, Dept Mech Engn, Columbus, OH 43210 USA.
RP Poggie, J (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RI Adamovich, Igor/E-6172-2014
OI Adamovich, Igor/0000-0001-6311-3940
FU Air Force Office of Scientific Research; Chief Scientist Innovative
Research Fund (CSIRF) of the Air Force Research Laboratory Air Vehicles
Directorate (AFRL/RB)
FX This project was sponsored in part by the Air Force Office of Scientific
Research (monitored by F Fahroo, AFOSR/RSL), and by a grant of High
Performance Computing time from the Air Force Research Laboratory Major
Shared Resource Center. Work at The Ohio State University was funded in
part by the Chief Scientist Innovative Research Fund (CSIRF) of the Air
Force Research Laboratory Air Vehicles Directorate (AFRL/RB). The
authors would like to thank M N Shneider for helpful discussions.
NR 66
TC 23
Z9 26
U1 6
U2 75
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0963-0252
EI 1361-6595
J9 PLASMA SOURCES SCI T
JI Plasma Sources Sci. Technol.
PD FEB
PY 2013
VL 22
IS 1
AR 015001
DI 10.1088/0963-0252/22/1/015001
PG 17
WC Physics, Fluids & Plasmas
SC Physics
GA 090GD
UT WOS:000314966300006
ER
PT J
AU Buszek, RJ
Lindsay, CM
Boatz, JA
AF Buszek, Robert J.
Lindsay, C. Michael
Boatz, Jerry A.
TI Tetrakis(nitratoxycarbon)methane (Nee CLL-1) as a Potential Explosive
Ingredient: a Theoretical Study
SO PROPELLANTS EXPLOSIVES PYROTECHNICS
LA English
DT Article
DE Ab initio calculations; Enthalpy of formation; Detonation velocity;
Detonation pressure; Explosives; CLL-1; Tetrakis(nitratoxycarbon)methane
ID PLESSET PERTURBATION TREATMENT; DECOMPOSITION; SYSTEMS
AB Ab initio electronic structure calculations at the MP2/cc-pVTZ level predict the vibrational stability of the theoretical molecule tetrakis(nitratoxycarbon)methane, designated CLL-1. The gas phase enthalpy of formation, predicted to be +1029.3kJmol1 using the G3(MP2) method, and the estimated density of 1.87gcm3 are used to predict the explosive performance properties using the equilibrium thermochemical code CHEETAH. The predicted detonation velocity (8.61kms1) and pressure (33.1GPa) are similar to those of RDX, but with a significantly higher detonation temperature (6740K). Finally, the stability of this theoretical molecule is investigated by calculating the lowest energy unimolecular decomposition pathways of the HCO3N model compound as well as barriers to rearrangement upon interaction of two HCO3N molecules.
C1 [Buszek, Robert J.; Boatz, Jerry A.] USAF, Res Lab, Propellants Branch, Edwards AFB, CA 93524 USA.
[Lindsay, C. Michael] USAF, Res Lab, Energet Mat Branch, Eglin AFB, FL 32578 USA.
RP Buszek, RJ (reprint author), USAF, Res Lab, Propellants Branch, Edwards AFB, CA 93524 USA.
EM c.lindsay@us.af.mil; Jerry.Boatz@edwards.af.mil
FU National Research Council at the Air Force Research Laboratory; Air
Force Office of Scientific Research [3002NZ, 3002NW]
FX The authors gratefully acknowledge the assistance of Jeffrey D. Mills,
who performed the CHEETAH calculations. This research was performed
while R. J. B. held a National Research Council Research Associateship
Award at the Air Force Research Laboratory. This work is supported by
research grants 3002NZ and 3002NW from the Air Force Office of
Scientific Research, Michael Berman Program Manager. A grant of computer
time at the Navy Department of Defense Supercomputing Resource Center,
Stennis Space Center, MS, is gratefully acknowledged.
NR 34
TC 1
Z9 1
U1 1
U2 6
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY
SN 0721-3115
J9 PROPELL EXPLOS PYROT
JI Propellants Explos. Pyrotech.
PD FEB
PY 2013
VL 38
IS 1
BP 9
EP 13
DI 10.1002/prep.201200156
PG 5
WC Chemistry, Applied; Engineering, Chemical
SC Chemistry; Engineering
GA 090QO
UT WOS:000314994200002
ER
PT J
AU Greener, T
Petersen, D
Pinske, K
Petersen, A
AF Greener, Trent
Petersen, Drew
Pinske, Kim
Petersen, Andrew
TI Traits of Successful Strength and Conditioning Coaches
SO STRENGTH AND CONDITIONING JOURNAL
LA English
DT Editorial Material
AB Working as a strength and conditioning coach is a challenging occupation by nature. Being an effective leader, and providing effective training programs and quality coaching, is a requirement in the profession. Because of this, we asked our panel of strength and conditioning coaches what traits (i.e., qualities individuals possess that are stableover time) and characteristics (i.e., learned or desirable skills) they believe are important in successful strength and conditioning coaches.
C1 [Greener, Trent] Univ Wyoming, Athlet Dept, Laramie, WY 82071 USA.
[Petersen, Drew] Humboldt State Univ, Athlet Dept, Arcata, CA 95521 USA.
[Pinske, Kim] USAF, Athlet Dept, Colorado Springs, CO USA.
[Petersen, Andrew] Humboldt State Univ, Arcata, CA USA.
RP Greener, T (reprint author), Univ Wyoming, Athlet Dept, Laramie, WY 82071 USA.
NR 0
TC 0
Z9 0
U1 1
U2 2
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 1524-1602
J9 STRENGTH COND J
JI Strength Cond. J.
PD FEB
PY 2013
VL 35
IS 1
BP 90
EP 93
DI 10.1519/SSC.0b013e3182822597
PG 4
WC Sport Sciences
SC Sport Sciences
GA 088EK
UT WOS:000314816400015
ER
PT J
AU Akers, B
Nicholls, DP
AF Akers, B.
Nicholls, D. P.
TI Spectral Stability of Deep Two-Dimensional Gravity-Capillary Water Waves
SO STUDIES IN APPLIED MATHEMATICS
LA English
DT Article
ID FINITE-AMPLITUDE; INSTABILITIES; EXPANSION
AB In this contribution we study the spectral stability problem for periodic traveling gravity-capillary waves on a two-dimensional fluid of infinite depth. We use a perturbative approach that computes the spectrum of the linearized water wave operator as an analytic function of the wave amplitude/slope. We extend the highly accurate method of Transformed Field Expansions to address surface tension in the presence of both simple and repeated eigenvalues, then numerically simulate the evolution of the spectrum as the wave amplitude is increased. We also calculate explicitly the first nonzero correction to the flat-water spectrum, which we observe to accurately predict the stability (or instability) for all amplitudes within the disk of analyticity of the spectrum. With this observation in mind, the disk of analyticity of the flat state spectrum is numerically estimated as a function of the Bond number and the Bloch parameter, and compared to the value of the wave slope at the first finite amplitude eigenvalue collision.
C1 [Akers, B.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
Univ Illinois, Chicago, IL 60680 USA.
RP Akers, B (reprint author), USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM benjamin.akers@afit.edu
NR 43
TC 4
Z9 4
U1 1
U2 5
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0022-2526
J9 STUD APPL MATH
JI Stud. Appl. Math.
PD FEB
PY 2013
VL 130
IS 2
BP 81
EP 107
DI 10.1111/j.1467-9590.2012.00574.x
PG 27
WC Mathematics, Applied
SC Mathematics
GA 090KR
UT WOS:000314978500001
ER
PT J
AU Santhosh, U
Ahmad, J
John, R
Ojard, G
Miller, R
Gowayed, Y
AF Santhosh, Unni
Ahmad, Jalees
John, Reji
Ojard, Greg
Miller, Robert
Gowayed, Yasser
TI Modeling of stress concentration in ceramic matrix composites
SO COMPOSITES PART B-ENGINEERING
LA English
DT Article
DE Ceramic-matrix composites (CMCs); Stress concentrations; Damage
mechanics; Finite element analysis (FEA); Mechanical testing
ID CRACKING
AB This paper describes a mechanistic modeling approach that attempts to capture the dominant micromechanical deformation and damage mechanisms in woven composites over the temperature and stress ranges relevant to gas turbine engine components. The model is incorporated into a finite-element framework and applied to analyze stress concentration at holes. The materials considered in this study are two-dimensional woven SiC/SiC and SiC/MAS composites. The results include the strain field near circular holes and global load-displacement behavior of the structure. In each case, the model predictions are compared with experimental measurements. Based on these comparisons, conclusions are drawn regarding the efficacy of the modeling approach and needs for further investigations are identified. (c) 2012 Elsevier Ltd. All rights reserved.
C1 [Santhosh, Unni; Ahmad, Jalees] Res Applicat Inc, San Diego, CA 92121 USA.
[John, Reji] AFRL RXLM, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Ojard, Greg; Miller, Robert] Pratt & Whitney, E Hartford, CT 06108 USA.
[Gowayed, Yasser] Auburn Univ, Dept Polymer & Fiber Engn, Auburn, AL 36849 USA.
RP Santhosh, U (reprint author), Struct Analyt Inc, POB 131447, Carlsbad, CA 92013 USA.
EM usanthosh@structuralanalyticsinc.com
FU Air Force Research Laboratory, Materials and Manufacturing Directorate
(AFRL/RX), WPAFB, Ohio, USA [FA8650-03-C-5228, F33615-01-C-5234]
FX The experiments on notched MI Sylramic-iBN/SiC composite with strain
gages were conducted at the Air Force Research Laboratory, Materials and
Manufacturing Directorate, AFRL/RXL, Wright-Patterson AFB (WPAFB), OH.
The authors appreciate the assistance of Dan Knapke of University of
Dayton Research Institute in conducting these experiments. The Air Force
Research Laboratory, Materials and Manufacturing Directorate (AFRL/RX),
WPAFB, Ohio, USA, sponsored this work under contracts FA8650-03-C-5228
and F33615-01-C-5234.
NR 8
TC 10
Z9 10
U1 3
U2 17
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 1359-8368
J9 COMPOS PART B-ENG
JI Compos. Pt. B-Eng.
PD FEB
PY 2013
VL 45
IS 1
BP 1156
EP 1163
DI 10.1016/j.compositesb.2012.07.034
PG 8
WC Engineering, Multidisciplinary; Materials Science, Composites
SC Engineering; Materials Science
GA 079ST
UT WOS:000314193200123
ER
PT J
AU Courtney, A
Berg, A
Michalke, G
Courtney, M
AF Courtney, A.
Berg, A.
Michalke, G.
Courtney, M.
TI A History of Blast Exposure May Affect the Transmission Properties of
Cranial Bone
SO EXPERIMENTAL MECHANICS
LA English
DT Article
DE Traumatic brain injury; TBI; Blast injury; Cranial bone; Shock tube
ID TRAUMATIC BRAIN-INJURY; HUMAN CORTICAL BONE; WAVE; DAMAGE; MODEL; RAT
AB An individual who has sustained mild traumatic brain injury (mTBI) due to impact is more susceptible to a second concussion for a time, presumably due to the vulnerability of the injured brain tissue. This knowledge informed military guidelines regarding return to duty following blast-related TBI (bTBI). However, bone mechanics studies have shown that bone experiences hysteresis above certain strains as a result of microdamage, which suggests that blast exposure may also reduce the ability of the cranium itself to protect the brain from another blast. In the present study, the response of deer skull bone to blast wave exposure was measured. Oxy-acetylene driven laboratory scale shock tubes were used to produce realistic blast loading profiles. When a skull was exposed to peak blast pressures of about 600 kPa (measured with the sensor facing the direction of propagation of the blast wave) from a 41 mm diameter shock tube, the peak transmitted pressure gradually increased from 13.1 % to 40.2 % over five trials. This hysteresis was persistent and repeatable but was not observed with more localized loading. Future work could more specifically quantify blast thresholds at which persistent changes could be expected. Results from such work would further inform clinical decisions regarding return to activity following bTBI. The present results show that blast loading history of cranial bone should be understood and controlled in the design of related experiments. The results also underscore the need for accurate material properties and experimental validation of numerical models of the interaction of blast waves with the cranium.
C1 [Courtney, A.] Force Protect Ind Inc, R&D, Ladson, SC 29456 USA.
[Berg, A.; Michalke, G.; Courtney, M.] USAF Acad, Colorado Springs, CO 80840 USA.
RP Courtney, A (reprint author), Force Protect Ind Inc, R&D, 9801 Highway 78, Ladson, SC 29456 USA.
EM amy_courtney@post.harvard.edu
FU BTG Research, Colorado Springs, Colorado
FX This work was supported in part by BTG Research, Colorado Springs,
Colorado.
NR 34
TC 1
Z9 1
U1 0
U2 9
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0014-4851
J9 EXP MECH
JI Exp. Mech.
PD FEB
PY 2013
VL 53
IS 2
BP 319
EP 325
DI 10.1007/s11340-012-9643-z
PG 7
WC Materials Science, Multidisciplinary; Mechanics; Materials Science,
Characterization & Testing
SC Materials Science; Mechanics
GA 081CO
UT WOS:000314294000016
ER
PT J
AU Li, YR
Shen, LX
Suter, BW
AF Li, Yan-Ran
Shen, Lixin
Suter, Bruce W.
TI Adaptive Inpainting Algorithm Based on DCT Induced Wavelet
Regularization
SO IEEE TRANSACTIONS ON IMAGE PROCESSING
LA English
DT Article
DE l(1) minimization; discrete cosine transform; framelet; inpainting;
Moreau envelope
ID SIMULTANEOUS CARTOON; IMAGE; RECOVERY; RECONSTRUCTION; MINIMIZATION;
COMPLETION; VIDEO
AB In this paper, we propose an image inpainting optimization model whose objective function is a smoothed l(1) norm of the weighted nondecimated discrete cosine transform (DCT) coefficients of the underlying image. By identifying the objective function of the proposed model as a sum of a differentiable term and a nondifferentiable term, we present a basic algorithm inspired by Beck and Teboulle's recent work on the model. Based on this basic algorithm, we propose an automatic way to determine the weights involved in the model and update them in each iteration. The DCT as an orthogonal transform is used in various applications. We view the rows of a DCT matrix as the filters associated with a multiresolution analysis. Nondecimated wavelet transforms with these filters are explored in order to analyze the images to be inpainted. Our numerical experiments verify that under the proposed framework, the filters from a DCT matrix demonstrate promise for the task of image inpainting.
C1 [Li, Yan-Ran] Shenzhen Univ, Coll Comp Sci & Software Engn, Shenzhen 518060, Peoples R China.
[Shen, Lixin] Syracuse Univ, Dept Math, Syracuse, NY 13244 USA.
[Shen, Lixin] Sun Yat Sen Univ, Sch Math & Computat Sci, Guangzhou 510275, Guangdong, Peoples R China.
[Suter, Bruce W.] USAF, Res Lab, AFRL RITB, Rome, NY 13441 USA.
RP Li, YR (reprint author), Shenzhen Univ, Coll Comp Sci & Software Engn, Shenzhen 518060, Peoples R China.
EM lyran@szu.edu.cn; lshen03@syr.edu; bruce.suter@rl.af.mil
FU Shenzhen Fundamental Research Program [JC201105130443A]; Guangdong
Natural Science Foundation [S2012040006740]; U.S. National Science
Foundation [DMS-0712827, DMS-1115523]; Air Force Summer Faculty
Fellowship Program; Guangdong Provincial Government of China through the
"Computational Science Innovative Research Team" Program
FX The work of Y.-R. Li was supported in part by the Shenzhen Fundamental
Research Program under Grant JC201105130443A and the Guangdong Natural
Science Foundation under Grant S2012040006740. The work of L. Shen was
supported in part by the U.S. National Science Foundation under Grant
DMS-0712827 and Grant DMS-1115523, the 2011 Air Force Summer Faculty
Fellowship Program, and the Guangdong Provincial Government of China
through the "Computational Science Innovative Research Team" Program.
The associate editor coordinating the review of this manuscript and
approving it for publication was Prof. Ton Kalker.
NR 41
TC 15
Z9 15
U1 2
U2 25
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1057-7149
J9 IEEE T IMAGE PROCESS
JI IEEE Trans. Image Process.
PD FEB
PY 2013
VL 22
IS 2
BP 752
EP 763
DI 10.1109/TIP.2012.2222896
PG 12
WC Computer Science, Artificial Intelligence; Engineering, Electrical &
Electronic
SC Computer Science; Engineering
GA 086VW
UT WOS:000314717800028
PM 23060331
ER
PT J
AU Alarcon, GM
Edwards, JM
AF Alarcon, Gene M.
Edwards, Jean M.
TI Ability and Motivation: Assessing Individual Factors That Contribute to
University Retention
SO JOURNAL OF EDUCATIONAL PSYCHOLOGY
LA English
DT Article
DE retention; personality; affectivity; motivation; ability
ID DISCRETE-TIME SURVIVAL; ACADEMIC-PERFORMANCE; NEGATIVE AFFECTIVITY;
COLLEGE PERFORMANCE; JOB-PERFORMANCE; CAUSAL MODEL; PERSONALITY;
STUDENTS; ABSENTEEISM; STRESSORS
AB The current study explored individual differences in ability and motivation factors of retention in first-year college students. We used discrete-time survival mixture analysis to model university retention. Parents' education, gender, American College Test (ACT) scores, conscientiousness, and trait affectivity were explored as predictors of retention. Results indicate gender, ACT scores, and conscientiousness are significant predictors of retention, but parents' education level was not a significant predictor. Positive affectivity and negative affectivity also were significant predictors of university retention when added to the model. Interestingly, once affectivity was added to the model, conscientiousness was no longer a significant predictor, indicating conscientiousness may be an amalgamation of motivation and ability. Implications for research and theory are discussed.
C1 [Alarcon, Gene M.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Edwards, Jean M.] Wright State Univ, Dept Psychol, Dayton, OH 45435 USA.
RP Alarcon, GM (reprint author), USAF, Res Lab, 2215 1st St,Bldg 33, Wright Patterson AFB, OH 45433 USA.
EM gene.alarcon@wpafb.af.mil
NR 55
TC 4
Z9 5
U1 4
U2 38
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0022-0663
J9 J EDUC PSYCHOL
JI J. Educ. Psychol.
PD FEB
PY 2013
VL 105
IS 1
BP 129
EP 137
DI 10.1037/a0028496
PG 9
WC Psychology, Educational
SC Psychology
GA 087DI
UT WOS:000314741100008
ER
PT J
AU Gee, KL
Neilsen, TB
Downing, JM
James, MM
McKinley, RL
McKinley, RC
Wall, AT
AF Gee, Kent L.
Neilsen, Tracianne B.
Downing, J. Micah
James, Michael M.
McKinley, Richard L.
McKinley, Robert C.
Wall, Alan T.
TI Near-field shock formation in noise propagation from a high-power jet
aircraft
SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
LA English
DT Article
ID CRACKLE
AB Noise measurements near the F-35A Joint Strike Fighter at military power are analyzed via spatial maps of overall and band pressure levels and skewness. Relative constancy of the pressure waveform skewness reveals that waveform asymmetry, characteristic of supersonic jets, is a source phenomenon originating farther upstream than the maximum overall level. Conversely, growth of the skewness of the time derivative with distance indicates that acoustic shocks largely form through the course of near-field propagation and are not generated explicitly by a source mechanism. These results potentially counter previous arguments that jet "crackle" is a source phenomenon. (C) 2013 Acoustical Society of America
C1 [Gee, Kent L.; Neilsen, Tracianne B.; Wall, Alan T.] Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA.
[Downing, J. Micah; James, Michael M.] Blue Ridge Res & Consulting LLC, Asheville, NC 28801 USA.
[McKinley, Richard L.; McKinley, Robert C.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Gee, KL (reprint author), Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA.
EM kentgee@byu.edu; tbn@byu.edu; micah.downing@blueridgeresearch.com;
michael.james@blueridgeresearch.com; richard.mckinley@wpafb.af.mil;
robert.mckinley@wpafb.af.mil; alantwall@gmail.com
FU F-35 Joint Strike Fighter Program Office; Air Force Research Laboratory
through the SBIR program; Blue Ridge Research and Consulting, Brigham
Young University; U.S. Air Force
FX The support of the F-35 Joint Strike Fighter Program Office is
acknowledged. (Distribution A - Approved for Public Release;
Distribution is Unlimited JSF12-991.) The authors gratefully acknowledge
funding from the Air Force Research Laboratory through the SBIR program
and support through a Cooperative Research and Development Agreement
(CRADA) between Blue Ridge Research and Consulting, Brigham Young
University, and the U.S. Air Force.
NR 24
TC 9
Z9 9
U1 2
U2 9
PU ACOUSTICAL SOC AMER AMER INST PHYSICS
PI MELVILLE
PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
SN 0001-4966
J9 J ACOUST SOC AM
JI J. Acoust. Soc. Am.
PD FEB
PY 2013
VL 133
IS 2
BP EL88
EP EL93
DI 10.1121/1.4773225
PG 6
WC Acoustics; Audiology & Speech-Language Pathology
SC Acoustics; Audiology & Speech-Language Pathology
GA 080TW
UT WOS:000314267200004
PM 23363199
ER
PT J
AU Gonzalez, LP
Upchurch, DC
Schunemann, PG
Mohnkern, L
Guha, S
AF Gonzalez, Leonel P.
Upchurch, Derek C.
Schunemann, Peter G.
Mohnkern, Lee
Guha, Shekhar
TI Second-harmonic generation of a tunable continuous-wave CO2 laser in
orientation-patterned GaAs
SO OPTICS LETTERS
LA English
DT Article
ID DIFFERENCE-FREQUENCY-GENERATION; GROWTH; THICK; FILMS
AB Tunable, mid-infrared radiation was obtained by frequency doubling of a continuous-wave CO2 laser in orientation-patterned GaAs crystal. Active cooling of the crystal minimized pump-induced thermal effects, allowing generation of output powers exceeding 300 mW across the wavelength range of 4.63-4.78 mu m. (C) 2013 Optical Society of America
C1 [Gonzalez, Leonel P.; Upchurch, Derek C.; Guha, Shekhar] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Upchurch, Derek C.] UES Inc, Dayton, OH 45432 USA.
[Schunemann, Peter G.; Mohnkern, Lee] BAE Syst Inc, Nashua, NH 03061 USA.
RP Gonzalez, LP (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM Leonel.Gonzalez@wpafb.af.mil
NR 13
TC 7
Z9 9
U1 0
U2 5
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 0146-9592
J9 OPT LETT
JI Opt. Lett.
PD FEB 1
PY 2013
VL 38
IS 3
BP 320
EP 322
PG 3
WC Optics
SC Optics
GA 085QP
UT WOS:000314629600028
PM 23381424
ER
PT J
AU Murray, DH
Pilmanis, AA
Blue, RS
Pattarini, JM
Law, J
Bayne, CG
Turney, MW
Clark, JB
AF Murray, Daniel H.
Pilmanis, Andrew A.
Blue, Rebecca S.
Pattarini, James M.
Law, Jennifer
Bayne, C. Gresham
Turney, Matthew W.
Clark, Jonathan B.
TI Pathophysiology, Prevention, and Treatment of Ebullism
SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE
LA English
DT Review
DE explosive decompression; vacuum; high altitude; medical protocol
ID VENOUS AIR-EMBOLISM; VACUUM; DOGS; DECOMPRESSION; PRESSURES; PATIENT
AB MURRAY DH, PILMANIS AA, BLUE RS, PATTARINI JM, LAW J, BAYNE CG, TURNEY MW, CLARK JB. Pathophysiology, prevention, and treatment of ebullism. Aviat Space Environ Med 2013; 84:89-96. Introduction: Ebullism is the spontaneous evolution of liquid water in tissues to water vapor at body temperature when the ambient pressure is 47 mmHg or less. While injuries secondary to ebullism are generally considered fatal, some reports have described recovery after exposure to near vacuum for several minutes. The objectives of this article are to review the current literature on ebullism and to present prevention and treatment recommendations that can be used to enhance the safety of high altitude activities and space operations. Methods: A systematic review was conducted on currently available information and published literature of human and animal studies involving rapid decompression to vacuum and ebullism, with subsequent development of an applicable treatment protocol. Results: Available research on ebullism in human and animal subjects is extremely limited. Literature available identified key pathophysiologic processes and mitigation strategies that were used for treatment protocol design and outlining appropriate interventions using current best medical practices and technologies. Discussion: Available literature suggests that the pathophysiology of ebullism leads to predictable and often treatable injuries, and that many exposures may be survivable. With the growing number of high altitude and space-related activities, more individuals will be at risk for ebullism. An integrated medical protocol can provide guidance for the prevention and treatment of ebullism and help to mitigate this risk in the future.
C1 [Murray, Daniel H.] Aerosp Med, Vandenberg AFB, CA USA.
[Pilmanis, Andrew A.; Pattarini, James M.] USAF, Res Lab, Brooks City Base, TX USA.
[Blue, Rebecca S.; Pattarini, James M.; Law, Jennifer] Univ Texas Med Branch, Galveston, TX 77555 USA.
[Bayne, C. Gresham] Janus Hlth, San Diego, CA USA.
[Turney, Matthew W.] Tillamook Emergency Serv Inc, Tillamook, OR USA.
[Clark, Jonathan B.] Baylor Coll Med, Ctr Space Med, Houston, TX 77030 USA.
RP Clark, JB (reprint author), Baylor Coll Med, Ctr Space Med, 6500 Main St,Suite 910, Houston, TX 77030 USA.
EM jclark1@bcm.edu
OI Clark, Jonathan/0000-0002-1162-1238
FU Red Bull Stratos high-altitude balloon program; University of Texas
Medical Branch; Baylor College of Medicine; National Space Biomedical
Research Institute
FX This research was supported by the scientific and medical endeavors of
the Red Bull Stratos high-altitude balloon program, and the work
presented here would not have been possible without the dedication and
support of the Stratos team, particularly Colonel Joe Kittinger, USAF
(Ret.), Art Thompson, and Dr. Jim Bagian. Further, we acknowledge the
support of the Percussionaire (R) Corporation for their dedication and
interest in this work. Finally, the authors are indebted to the
University of Texas Medical Branch, Baylor College of Medicine, and the
National Space Biomedical Research Institute for their support of this
research.
NR 35
TC 6
Z9 6
U1 1
U2 11
PU AEROSPACE MEDICAL ASSOC
PI ALEXANDRIA
PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 USA
SN 0095-6562
J9 AVIAT SPACE ENVIR MD
JI Aviat. Space Environ. Med.
PD FEB
PY 2013
VL 84
IS 2
BP 89
EP 96
DI 10.3357/ASEM.3468.2013
PG 8
WC Public, Environmental & Occupational Health; Medicine, General &
Internal; Sport Sciences
SC Public, Environmental & Occupational Health; General & Internal
Medicine; Sport Sciences
GA 079VO
UT WOS:000314200500001
PM 23447845
ER
PT J
AU Misak, HE
Asmatulu, R
Sabelkin, V
Mall, S
Kladitis, PE
AF Misak, H. E.
Asmatulu, R.
Sabelkin, V.
Mall, S.
Kladitis, P. E.
TI Tension-tension fatigue behavior of carbon nanotube wires
SO CARBON
LA English
DT Article
ID MECHANICAL-PROPERTIES; SHEETS; YARNS
AB The tension-tension fatigue behavior of three types of as-received carbon nanotube (CNT) wires, comprising of 30-, 60-, and 100-yam, was investigated. Fatigue tests were conducted at 35%, 50%, 60%, 75% and 80% of their ultimate tensile strengths which provided the fatigue life data (S-N curves). Their electrical conductivities were measured as a function of the number of cycles. Fatigue strength of the CNT wires at a given number of cycles decreased with an increase in the number of yams. Their electrical conductivity increased with increase of applied fatigue load and number of fatigue cycles. Damage and failure mechanisms involved relative sliding of yarns in CNT wires leading to the formation of kink bands, followed by plastic deformation and then breakage of yarns. Microtomography density measurements provided the evidence that the increase in conductivity was due to the reduction of micro/nano voids between and inside the yarns, which decreased with increasing fatigue load and number of fatigue cycles. Published by Elsevier Ltd.
C1 [Misak, H. E.; Sabelkin, V.; Mall, S.; Kladitis, P. E.] USAF, Inst Technol, Dept Aerosp Engn, Wright Patterson AFB, OH 45433 USA.
[Asmatulu, R.] Wichita State Univ, Dept Mech Engn, Wichita, KS 67260 USA.
RP Mall, S (reprint author), USAF, Inst Technol, Dept Aerosp Engn, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM shankar.mall@afit.edu
FU U.S. Air Force; American Society for Engineering Education; Air Force
Institute of Technology
FX The authors gratefully acknowledge the U.S. Air Force, American Society
for Engineering Education, and Air Force Institute of Technology for the
support of this work.
NR 15
TC 8
Z9 9
U1 3
U2 45
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0008-6223
J9 CARBON
JI Carbon
PD FEB
PY 2013
VL 52
BP 225
EP 231
DI 10.1016/j.carbon.2012.09.024
PG 7
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 079SO
UT WOS:000314192700026
ER
PT J
AU Guglielmotti, V
Tamburri, E
Orlanducci, S
Terranova, ML
Rossi, M
Notarianni, M
Fairchild, SB
Maruyama, B
Behabtu, N
Young, CC
Pasquali, M
AF Guglielmotti, V.
Tamburri, E.
Orlanducci, S.
Terranova, M. L.
Rossi, M.
Notarianni, M.
Fairchild, S. B.
Maruyama, B.
Behabtu, N.
Young, C. C.
Pasquali, M.
TI Macroscopic self-standing SWCNT fibres as efficient electron emitters
with very high emission current for robust cold cathodes
SO CARBON
LA English
DT Article
ID WALLED CARBON NANOTUBES; FIELD-EMISSION; LARGE-AREA; SIDE WALL; TIP;
YARNS; FILMS; NEAT
AB A novel of self-standing nanotube-based cold cathode is described. The electron emitter is a single macroscopic fibre spun from neat single wall carbon nanotubes and consists of an ensemble of nanotube bundles held together by van der Waals forces. Field emission measurements carried out using two different types of apparatus demonstrated the long working life of the realised cathode. The system is able to emit at very high current densities, up to 13 A/cm(2), and shows very low values of both turn on and threshold field, 0.12 V/mu m and 0.21 V/mu m, respectively. Such easy to handle self-standing electron sources assure good performances and represent an enabling technology for a scalable production of cold cathodes. (C) 2012 Elsevier Ltd. All rights reserved.
C1 [Guglielmotti, V.; Tamburri, E.; Orlanducci, S.; Terranova, M. L.] Univ Roma Tor Vergata, Dipto Sci & Tecnol Chim, I-00133 Rome, Italy.
[Rossi, M.; Notarianni, M.] Univ Roma La Sapienza, Dipto Sci Base & Applicate Ingn, I-00161 Rome, Italy.
[Fairchild, S. B.; Maruyama, B.] USAF, Mat & Mfg Directorate, Res Lab, Dayton, OH USA.
[Behabtu, N.; Young, C. C.; Pasquali, M.] Rice Univ, Dept Chem & Biomol Engn & Chem, Houston, TX USA.
[Pasquali, M.] Rice Univ, Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA.
RP Rossi, M (reprint author), Univ Roma La Sapienza, Dipto Sci Base & Applicate Ingn, Via A Scarpa, I-00161 Rome, Italy.
EM marcorossi@uniroma1.it
RI Pasquali, Matteo/A-2489-2008; TAMBURRI, EMANUELA/M-7740-2015; Rossi,
Marco/G-1689-2012
OI Pasquali, Matteo/0000-0001-5951-395X; TAMBURRI,
EMANUELA/0000-0003-2643-8249; Rossi, Marco/0000-0001-7603-1805
FU AFOSR [FA9550-06-1-0207, FA9550-09-1-0590]; AFRL [FA8650-07-2-5061,
07-S568-0042-01-C1]; Welch Foundation [C-1668]
FX This work was supported by AFOSR (FA9550-06-1-0207 & FA9550-09-1-0590),
AFRL (FA8650-07-2-5061 & 07-S568-0042-01-C1), and the Welch Foundation
(C-1668).
NR 54
TC 17
Z9 17
U1 3
U2 58
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0008-6223
EI 1873-3891
J9 CARBON
JI Carbon
PD FEB
PY 2013
VL 52
BP 356
EP 362
DI 10.1016/j.carbon.2012.09.037
PG 7
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 079SO
UT WOS:000314192700039
ER
PT J
AU Rankin, BA
Blunck, DL
Gore, JP
AF Rankin, Brent A.
Blunck, David L.
Gore, Jay P.
TI Infrared Imaging and Spatiotemporal Radiation Properties of a Turbulent
Nonpremixed Jet Flame and Plume
SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
LA English
DT Article
DE flame radiation; turbulent flames; nonintrusive measurement; stochastic
analysis; infrared imaging
ID LASER-INDUCED FLUORESCENCE; SPECTRAL RADIATION; STOCHASTIC TIME;
DIFFUSION FLAME; SIMULATION; FIRES; SOOT
AB Radiation transfer from turbulent nonpremixed jet flames and plumes is important in many applications such as energy-efficient combustion systems, temperature sensitive pollutant control, and detection, control, and suppression of accidental fires. Combined spatial and temporal correlations of scalar values such as temperature and species concentrations affect the emitted radiation intensity. Spatiotemporal correlations and radiation intensity measurements downstream of the reacting parts of flames (plumes) have received limited attention. Motivated by this, planar time-dependent narrowband radiation intensity measurements are acquired of a turbulent nonpremixed flame and its plume using an infrared camera. Temporally and spatially correlated instantaneous realizations of local scalars and path integrated intensity values are calculated using a stochastic time and space series analysis, a narrowband radiation model, and the radiative transfer equation. The time-dependent infrared images reveal intermittent, low intensity regions in the plume characteristic of buoyancy-dominated transport. High radiation intensity structures are observed in the flame characteristic of momentum dominated flow and vorticity driven mixing. Normalized intensity fluctuations are nearly constant in the flame region, but increase by up to a factor of three in the plume. Normalized temporal correlations, power spectral density functions, and spatial correlations of the intensity are independent of the spatial location throughout both the flame and the plume. Spatial correlations of the radiation intensity exhibit approximately linear decay to half an integral length scale followed by an exponential decrement. The radiation intensity fluctuations remain spatially correlated up to separation distances two times larger than the integral length scale. Space-time cross correlations of the intensity fluctuations are measured for the first time and are shown to be more isotropic in comparison to the product of the spatial and temporal correlations. This suggests that a correction factor should be applied to the space-time correlation model in future stochastic calculations to account for the anisotropy. The infrared imaging technique, illustrated in this paper, is promising to be a useful qualitative and quantitative nonintrusive technique for studying both reacting and nonreacting flows. [DOI: 10.1115/1.4007609]
C1 [Rankin, Brent A.; Gore, Jay P.] Purdue Univ, Maurice J Zucrow Labs, Sch Mech Engn, W Lafayette, IN 47907 USA.
[Blunck, David L.] USAF, Combust Branch, Prop Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Rankin, BA (reprint author), Purdue Univ, Maurice J Zucrow Labs, Sch Mech Engn, 500 Allison Rd, W Lafayette, IN 47907 USA.
EM brankin@purdue.edu; david.blunck@wpafb.af.mil; gore@purdue.edu
RI Rankin, Brent/A-1598-2017
OI Rankin, Brent/0000-0002-5967-9527
NR 41
TC 3
Z9 3
U1 2
U2 28
PU ASME
PI NEW YORK
PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0022-1481
EI 1528-8943
J9 J HEAT TRANS-T ASME
JI J. Heat Transf.-Trans. ASME
PD FEB
PY 2013
VL 135
IS 2
AR 021201
DI 10.1115/1.4007609
PG 11
WC Thermodynamics; Engineering, Mechanical
SC Thermodynamics; Engineering
GA 077OJ
UT WOS:000314036700001
ER
PT J
AU Pusateri, AE
Weiskopf, RB
Bebarta, V
Butler, F
Cestero, RF
Chaudry, IH
Deal, V
Dorlac, WC
Gerhardt, RT
Given, MB
Hansen, DR
Hoots, WK
Klein, HG
Macdonald, VW
Mattox, KL
Michael, RA
Mogford, J
Montcalm-Smith, EA
Niemeyer, DM
Prusaczyk, WK
Rappold, JF
Rassmussen, T
Rentas, F
Ross, J
Thompson, C
Tucker, LD
AF Pusateri, Anthony E.
Weiskopf, Richard B.
Bebarta, Vikhyat
Butler, Frank
Cestero, Ramon F.
Chaudry, Irshad H.
Deal, Virgil
Dorlac, Warren C.
Gerhardt, Robert T.
Given, Michael B.
Hansen, Dan R.
Hoots, W. Keith
Klein, Harvey G.
Macdonald, Victor W.
Mattox, Kenneth L.
Michael, Rodney A.
Mogford, Jon
Montcalm-Smith, Elizabeth A.
Niemeyer, Debra M.
Prusaczyk, W. Keith
Rappold, Joseph F.
Rassmussen, Todd
Rentas, Francisco
Ross, James
Thompson, Christopher
Tucker, Leo D.
CA US DoD Hemorrhage Resuscitation Re
TI TRANEXAMIC ACID AND TRAUMA: CURRENT STATUS AND KNOWLEDGE GAPS WITH
RECOMMENDED RESEARCH PRIORITIES
SO SHOCK
LA English
DT Review
DE Tranexamic acid; trauma; efficacy; safety; research requirements
ID PLACEBO-CONTROLLED TRIAL; CARDIAC-SURGERY; CARDIOPULMONARY BYPASS;
SEIZURES; APROTININ; HEMORRHAGE; TRANSFUSION; CRASH-2; SAFETY
AB A recent large civilian randomized controlled trial on the use of tranexamic acid (TXA) for trauma reported important survival benefits. Subsequently, successful use of TXA for combat casualties in Afghanistan was also reported. As a result of these promising studies, there has been growing interest in the use of TXA for trauma. Potential adverse effects of TXA have also been reported. A US Department of Defense committee conducted a review and assessment of knowledge gaps and research requirements regarding the use of TXA for the treatment of casualties that have experienced traumatic hemorrhage. We present identified knowledge gaps and associated research priorities. We believe that important knowledge gaps exist and that a targeted, prioritized research effort will contribute to the refinement of practice guidelines over time.
C1 [Pusateri, Anthony E.] USA, Med Res & Mat Command, Ft Detrick, MD 21702 USA.
[Weiskopf, Richard B.] Univ Calif San Francisco, San Francisco, CA 94143 USA.
[Butler, Frank] Def Hlth Board, Comm Tact Combat Casualty Care, Pensacola, FL USA.
[Cestero, Ramon F.; Ross, James] USN, Med Res Unit, Ft Sam Houston, TX USA.
[Chaudry, Irshad H.] Univ Alabama Birmingham, Birmingham, AL USA.
[Deal, Virgil] US Special Operat Command, Macdill AFB, FL USA.
[Dorlac, Warren C.] Univ Cincinnati, Ctr Sustainment Trauma & Readiness Skills, Cincinnati, OH USA.
[Gerhardt, Robert T.; Rassmussen, Todd] USA, Inst Surg Res, Ft Sam Houston, TX 78234 USA.
[Given, Michael B.] Off Naval Res, Arlington, VA 22217 USA.
[Hoots, W. Keith] NHLBI, Bethesda, MD 20892 USA.
[Klein, Harvey G.] NIH, Ctr Clin, Bethesda, MD 20892 USA.
[Macdonald, Victor W.; Michael, Rodney A.] US Army Med Mat Dev Act, Ft Detrick, MD USA.
[Mattox, Kenneth L.] Baylor Coll Med, Houston, TX 77030 USA.
[Mogford, Jon] Def Adv Res Projects Agcy, Arlington, VA USA.
[Montcalm-Smith, Elizabeth A.] USN, Med Res Ctr, Silver Spring, MD USA.
[Prusaczyk, W. Keith] USN, Med Res & Dev Ctr, Frederick, MD USA.
[Rappold, Joseph F.] USN, Med Ctr, San Diego, CA 92152 USA.
[Rentas, Francisco] US Armed Serv Blood Program Off, Falls Church, VA USA.
[Thompson, Christopher] USN, Undersea Med Inst, Groton, CT USA.
[Tucker, Leo D.] USA, Med Ctr & Sch, Ft Sam Houston, TX USA.
RP Pusateri, AE (reprint author), USA, DoD Hemorrhage & Resuscitat Res & Dev Program, Combat Casualty Care Res Program, Med Res & Mat Command, Bldg 722, Ft Detrick, MD 21702 USA.
EM anthony.pusateri@amedd.army.mil
RI bebarta, vikhyat/K-3476-2015
NR 34
TC 39
Z9 39
U1 0
U2 11
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 1073-2322
J9 SHOCK
JI Shock
PD FEB
PY 2013
VL 39
IS 2
BP 121
EP 126
DI 10.1097/SHK.0b013e318280409a
PG 6
WC Critical Care Medicine; Hematology; Surgery; Peripheral Vascular Disease
SC General & Internal Medicine; Hematology; Surgery; Cardiovascular System
& Cardiology
GA 080ZF
UT WOS:000314282900002
PM 23222525
ER
PT J
AU Cohen, SP
Galvagno, SM
Plunkett, A
Harris, D
Kurihara, C
Turabi, A
Rehrig, S
Buckenmaier, CC
Chelly, JE
AF Cohen, Steven P.
Galvagno, Samuel M.
Plunkett, Anthony
Harris, Diamond
Kurihara, Connie
Turabi, Ali
Rehrig, Scott
Buckenmaier, Chester C., III
Chelly, Jacques E.
TI A Multicenter, Randomized, Controlled Study Evaluating Preventive
Etanercept on Postoperative Pain After Inguinal Hernia Repair
SO ANESTHESIA AND ANALGESIA
LA English
DT Article
ID TUMOR-NECROSIS-FACTOR; CHRONIC CONSTRICTION INJURY; FACTOR-ALPHA;
RISK-FACTORS; GROIN HERNIA; THORACIC-SURGERY; NEUROPATHIC PAIN; LIMB
AMPUTATION; PHANTOM LIMB; NERVE
AB BACKGROUND: Chronic postsurgical pain (CPSP) affects between 5% and 70% of surgical patients, depending on the surgery. There is no reliable treatment for CPSP which has led to an increased emphasis on prevention. In this study, we sought to determine whether preventive etanercept can decrease the magnitude of postoperative pain and reduce the incidence of CPSP
METHODS: We performed a multicenter, randomized study in 7:7 patients comparing subcutaneous etanercept 50 mg administered 90 minutes before inguinal hernia surgery with saline. Patients, surgeons, anesthesiologists, the injecting physician, nursing staff, and evaluators were blinded. The primary outcome measure was a 24-hour numerical rating scale pain score. Secondary outcome measures were postanesthesia care unit pain scores, 24-hour opioid requirements, time to first analgesic, and pain scores recorded at 1 month, 3 months, 6 months, and 12 months.
RESULTS: Mean 24-hour pain scores were 3.3 (95% confidence interval [CI], 3.2-4.6) in the etanercept and 3.9 (95% Cl, 2.6-4.0) in the control group (P = 0.22). The mean number of analgesic pills used in the first 24 hours was 4.0 (SD, 2.8) in the treatment versus 5.8 (SD, 4.2) in the control group (P = 0.03). At 1 month, 10 patients (29%) in the treatment group reported pain versus 21 (49%) control patients (P = 0,08). The presence of pain at 1 month was significantly associated with pain at 3 months (hazard ratio, 0.74; 99% CI, 0.52-0.97; P = 0.03).
CONCLUSION: Although preventive etanercept was superior to saline in reducing postoperative pain on some measures, the effect sizes were small, transient, and not statistically significant. Different dosing regimens in a larger population should be explored in future studies. (Anesth Analg 2013;116:455-62)
C1 [Cohen, Steven P.; Kurihara, Connie; Turabi, Ali; Buckenmaier, Chester C., III] Walter Reed Natl Mil Med Ctr, Dept Anesthesiol, Baltimore, MD 21205 USA.
[Rehrig, Scott] Walter Reed Natl Mil Med Ctr, Dept Surg, Baltimore, MD 21205 USA.
[Cohen, Steven P.] Johns Hopkins Sch Med, Dept Anesthesiol & Crit Care Med, Baltimore, MD USA.
[Galvagno, Samuel M.] Univ Maryland, Med Ctr, Dept Anesthesiol, Baltimore, MD 21201 USA.
Joint Base Andrews, Andrews AFB, MD USA.
[Plunkett, Anthony] Womack Army Med Ctr, Dept Anesthesiol, Ft Bragg, NC USA.
[Harris, Diamond; Chelly, Jacques E.] Univ Pittsburgh, Sch Med, Dept Anesthesiol, Pittsburgh, PA 15261 USA.
[Buckenmaier, Chester C., III] Def & Vet Ctr Integrat Pain Management, Rockville, MD USA.
RP Cohen, SP (reprint author), Walter Reed Natl Mil Med Ctr, Dept Anesthesiol, 550 N Broadway,Suite 301, Baltimore, MD 21205 USA.
EM scohen40@jhmi.edu
OI rehrig, scott/0000-0002-1287-9708
FU Defense and Veterans Center for Integrative Pain Management, Rockville,
MD
FX Supported in part by a Congressional Grant from the Defense and Veterans
Center for Integrative Pain Management, Rockville, MD.
NR 42
TC 13
Z9 14
U1 1
U2 6
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0003-2999
J9 ANESTH ANALG
JI Anesth. Analg.
PD FEB
PY 2013
VL 116
IS 2
BP 455
EP 462
DI 10.1213/ANE.0b013e318273f71c
PG 8
WC Anesthesiology
SC Anesthesiology
GA 078DJ
UT WOS:000314078300030
PM 23302973
ER
PT J
AU Crisp, HC
Johnson, KS
AF Crisp, Howard C.
Johnson, Kimberly S.
TI Mosquito allergy
SO ANNALS OF ALLERGY ASTHMA & IMMUNOLOGY
LA English
DT Review
ID SALIVARY-GLAND EXTRACTS; WHOLE-BODY EXTRACTS; AEDES-AEGYPTI; BITE
REACTIONS; CLINICAL-RELEVANCE; IGG ANTIBODIES; CHILDREN;
HYPERSENSITIVITY; IMMUNOTHERAPY; CETIRIZINE
C1 [Crisp, Howard C.; Johnson, Kimberly S.] Wilford Hall Ambulatory Surg Ctr, Dept Med, Div Allergy Immunol, San Antonio, TX USA.
RP Crisp, HC (reprint author), 2200 Bergquist Dr,Ste 1, Lackland AFB, TX 78236 USA.
EM howard.crisp@us.af.mil
NR 53
TC 3
Z9 3
U1 0
U2 8
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 1081-1206
J9 ANN ALLERG ASTHMA IM
JI Ann. Allergy Asthma Immunol.
PD FEB
PY 2013
VL 110
IS 2
BP 65
EP 69
DI 10.1016/j.anai.2012.07.023
PG 5
WC Allergy; Immunology
SC Allergy; Immunology
GA 078PK
UT WOS:000314111400002
PM 23352522
ER
PT J
AU Allen, C
Valco, D
Toulson, E
Edwards, T
Lee, T
AF Allen, Casey
Valco, Daniel
Toulson, Elisa
Edwards, Tim
Lee, Tonghun
TI Ignition behavior and surrogate modeling of JP-8 and of camelina and
tallow hydrotreated renewable jet fuels at low temperatures
SO COMBUSTION AND FLAME
LA English
DT Article
DE Autoignition; Rapid compression machine; Hydrotreated renewable jet
fuels; JP-8
ID RAPID COMPRESSION MACHINE; COMBUSTION; MIXTURES
AB The autoignition characteristics of the conventional jet fuel, JP-8, and the alternative jet fuels, camelina and tallow hydrotreated renewable jet (HRJ) fuels, are investigated using a rapid compression machine and the direct test chamber charge preparation approach. Ignition delay measurements are made at low compressed temperatures (625 K <= T-c <= 730 K), compressed pressures of p(c) = 5, 10, and 20 bar, and equivalence ratios of phi = 0.25, 0.5 and 1.0 in air. The HRJ fuels ignite more readily than JP-8 for all tested conditions, consistent with derived cetane number data in the literature. The camelina and tallow HRJ fuels exhibit similar autoignition characteristics, but the two fuels can be distinguished under stoichiometric conditions. Kinetic modeling is conducted with a 2-component surrogate (10% n-dodecane/90% 2-methylundecane) and a single component surrogate (2-methylnonane) to evaluate the potential to predict ignition behavior of the HRJ fuels. Modeling results indicate that the surrogate fuels can only provide useful predictions at a limited set of conditions (p(c) = 5 bar and phi = 1.0), and that the agreement of the model and experimental data improves with decreasing compressed pressure. Under most conditions, the 2-component surrogate provides better prediction of ignition behavior, but the single component surrogate is superior at low pressures near the negative temperature coefficient region. (c) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
C1 [Allen, Casey; Valco, Daniel; Toulson, Elisa; Lee, Tonghun] Michigan State Univ, Dept Mech Engn, E Lansing, MI 48824 USA.
[Edwards, Tim] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Lee, T (reprint author), Michigan State Univ, Dept Mech Engn, 2555 Engn Bldg, E Lansing, MI 48824 USA.
EM tonghun@msu.edu
RI Lee, Tonghun/A-5263-2014
FU Defense Logistics Agency (DLA) [SP4701-11-C-0011]
FX The authors gratefully acknowledge the support of the Defense Logistics
Agency (DLA) under Contract SP4701-11-C-0011. Additionally, the authors
acknowledge Michigan State University - RTSF - Mass Spectrometry Core
for graciously providing access to the GC/MS instrumentation.
NR 26
TC 27
Z9 27
U1 2
U2 21
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0010-2180
J9 COMBUST FLAME
JI Combust. Flame
PD FEB
PY 2013
VL 160
IS 2
BP 232
EP 239
DI 10.1016/j.combustflame.2012.10.008
PG 8
WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary;
Engineering, Chemical; Engineering, Mechanical
SC Thermodynamics; Energy & Fuels; Engineering
GA 068ZU
UT WOS:000313405500002
ER
PT J
AU Schmidt, J
Kostka, S
Roy, S
Gord, J
Ganguly, B
AF Schmidt, Jacob
Kostka, Stanislav
Roy, Sukesh
Gord, James
Ganguly, Biswa
TI kHz-rate particle-image velocimetry of induced instability in premixed
propane/air flame by millisecond pulsed current-voltage
SO COMBUSTION AND FLAME
LA English
DT Article
DE Laminar combustion; Pulsed electric field; Particle image velocimetry
ID ELECTRIC-FIELD; HEAT RELEASE; PRESSURE; ADEQUACY; SPEED
AB Particle-image velocimetry (PIV) measurements were performed at 6 kHz repetition rate in a premixed propane/air flame to examine the effects caused by applied millisecond-wide pulsed voltage-current below self-sustained breakdown. We have demonstrated significant structural changes to a burner-stabilized downward-propagating atmospheric pressure propane/air flame with overall flow speeds near 2 m/s with +3 kV pulsed applied voltages over 30 mm gaps. Phase-locked, 2 kHz broadband emission measurements of flame structure were also collected to support the PIV velocity data. The combined high-speed Ply and flame emission measurements were both capable of capturing changes from a single applied voltage pulse rather than using a phase matching approach requiring a highly repeatable disturbance as done previously [1]. The measured reductions in flame height, increases in local flow speeds, generation of large velocity gradients, and rapid oscillations in flame front are suggestive of an induced turbulence in an otherwise laminar flame. Taylor microscale lengths were calculated from the kHz PIV data and structures comparable to the reaction zone thickness were shown to increase during the applied voltage pulse. The timescale under which the flame flow changes combined with the accompanying flame emission measurements suggest that flame fluidics are modified by ion drift current induced net body force in or near the cathode fall at the base of the flame. The reduction in overall flame height and increase in speed near the base of the flame is suggestive of a 'virtual' bluff-body present in the flow. These fluidic changes force the flame to transition from a laminar to a highly unstable, transitioning to turbulence regime. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
C1 [Schmidt, Jacob; Kostka, Stanislav; Roy, Sukesh] Spectral Energies LLC, Dayton, OH 45431 USA.
[Gord, James; Ganguly, Biswa] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Schmidt, J (reprint author), Spectral Energies LLC, 5100 Springfield St, Dayton, OH 45431 USA.
EM JSchmidt@SpectralEnergies.com
OI Schmidt, Jacob/0000-0002-9855-6319
FU AFOSR; Air Force Research Laboratory [FA8650-10-C-2008]
FX Funding for this research was provided by AFOSR and the Air Force
Research Laboratory under Contract No: FA8650-10-C-2008.
NR 32
TC 5
Z9 5
U1 0
U2 24
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0010-2180
J9 COMBUST FLAME
JI Combust. Flame
PD FEB
PY 2013
VL 160
IS 2
BP 276
EP 284
DI 10.1016/j.combustflame.2012.10.013
PG 9
WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary;
Engineering, Chemical; Engineering, Mechanical
SC Thermodynamics; Energy & Fuels; Engineering
GA 068ZU
UT WOS:000313405500006
ER
PT J
AU Ruggles-Wrenn, MB
Jones, TP
AF Ruggles-Wrenn, M. B.
Jones, T. P.
TI Tension-compression fatigue of a SiC/SiC ceramic matrix composite at
1200 degrees C in air and in steam
SO INTERNATIONAL JOURNAL OF FATIGUE
LA English
DT Article
DE Ceramic matrix composites (CMCs); Fatigue; High-temperature properties;
Mechanical properties; Fractography
ID CREEP-BEHAVIOR; HIGH-TEMPERATURE; OXIDATION; MECHANISMS; STABILITY;
FAILURE; DAMAGE; SIBC; CMCS
AB Tension-compression fatigue behavior of a non-oxide ceramic composite with a multilayered matrix was investigated at 1200 degrees C in laboratory air and in steam. The composite was produced via chemical vapor infiltration (CVO. The composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide and was reinforced with laminated woven Hi-Nicalon (TM) fibers. Fiber preforms had pyrolytic carbon fiber coating with boron carbide overlay applied. Tension-compression fatigue behavior was studied for fatigue stresses ranging from 80 to 200 MPa at a frequency of 1.0 Hz. Presence of steam significantly degraded the fatigue performance. Specimens that achieved fatigue run-out were subjected to tensile tests to failure to characterize the retained tensile properties. The material retained 100% of its tensile strength. Composite microstructure, as well as damage and failure mechanisms were investigated. Published by Elsevier Ltd.
C1 [Ruggles-Wrenn, M. B.; Jones, T. P.] USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
RP Ruggles-Wrenn, MB (reprint author), USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
EM marina.ruggles-wrenn@afit.edu
RI Ruggles-Wrenn, Marina/J-6103-2014
NR 29
TC 12
Z9 14
U1 2
U2 52
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0142-1123
J9 INT J FATIGUE
JI Int. J. Fatigue
PD FEB
PY 2013
VL 47
BP 154
EP 160
DI 10.1016/j.ijfatigue.2012.08.006
PG 7
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA 069WH
UT WOS:000313467300016
ER
PT J
AU Branch, NA
Arakere, NK
Forster, N
Svendsen, V
AF Branch, Nathan A.
Arakere, Nagaraj K.
Forster, Nelson
Svendsen, Vaughn
TI Critical stresses and strains at the spall edge of a case hardened
bearing due to ball impact
SO INTERNATIONAL JOURNAL OF FATIGUE
LA English
DT Article
DE Rolling contact fatigue; Spall propagation; Ball bearings; Case hardened
steels; Finite elements
ID ROLLING-CONTACT FATIGUE; SILICON-NITRIDE; AISI 52100; PROPAGATION;
FAILURE; LIFE; M50; TECHNOLOGY; PREDICTION; HARDNESS
AB Short spall propagation times of failing main shaft ball bearings of aircraft engines are a serious safety concern for single engine aircraft. Bearing designers would like to understand the impact of four variables namely (i) ball material density, (ii) subsurface residual stress, (iii) gradient in yield strength with depth (case hardening), and (iv) raceway surface hardness/yield strength that are thought to affect spall propagation. Extensive spall propagation experiments have been conducted at AFRL, Ohio in the past few years to address this issue. However, a detailed mechanistic analysis of these experiments has not been performed. This work presents an elastic plastic finite element (FE) model that simulates a ball impacting a spall edge to determine the relative contributions of the four material variables on spall propagation. The magnitude and extent of damage of the spall edge material is determined based on critical stresses and plastic strains induced by the ball impact. The results indicate that the influence of ball density is greatest on inducing damage at the impacted spall edge when compared to the other three properties, which also agrees with the hybrid bearing spall propagation tests conducted at AFRL (C) 2012 Elsevier Ltd. All rights reserved.
C1 [Branch, Nathan A.; Forster, Nelson; Svendsen, Vaughn] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
[Arakere, Nagaraj K.] Univ Florida, Gainesville, FL 32611 USA.
RP Arakere, NK (reprint author), Univ Florida, Gainesville, FL 32611 USA.
EM Nagaraj@ufl.edu
NR 31
TC 4
Z9 5
U1 2
U2 23
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0142-1123
J9 INT J FATIGUE
JI Int. J. Fatigue
PD FEB
PY 2013
VL 47
BP 268
EP 278
DI 10.1016/j.ijfatigue.2012.09.008
PG 11
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA 069WH
UT WOS:000313467300028
ER
PT J
AU Hanchak, MS
Briones, AM
Ervin, JS
Byrd, LW
AF Hanchak, Michael S.
Briones, Alejandro M.
Ervin, Jamie S.
Byrd, Larry W.
TI One-dimensional models of nanoliter droplet evaporation from a hot
surface in the transition regime
SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
LA English
DT Article
DE Droplet evaporation; Transition regime; One-dimensional model; Kinetic
mass flux; Accommodation coefficient
ID COOLING HEAT-TRANSFER; CONDENSATION COEFFICIENT; MOLECULAR-DYNAMICS;
WATER; VAPORIZATION; VAPOR
AB A novel one-dimensional model of the evaporation of liquid water droplets from a hot surface is presented. The one-dimensional finite-difference model solves the governing equations of continuity, momentum, species and energy within the gaseous phase in spherical coordinates. The model includes the Hertz-Knudsen kinetic evaporative mass flux with a correction for the transitional regime that exists between continuum and molecular length-scales. The accommodation coefficient of the kinetic mass flux is constant and set to unity while the droplet thermal conductance is a multiple of the thermal conductivity of water. The model employs a uniform discretization of the spherical vapor region surrounding the droplet and a one-dimensional conduction model of the droplet itself. The model can also emulate pinned and de-pinned contact lines based on a geometric expression. Several theories of evaporative mass flux in the transition regime are compared. Droplet evaporation data is acquired with a standard dispensing/imaging system and high-speed photography. The calculated, transient droplet volumes are compared to experimental evaporation data of sessile droplets ranging from 30 to 80 mu m initial radius (0.06-1.4 nanoliters). Simplification of the one-dimensional equations leads to a semi-analytical model. Good agreement is achieved between both models and the experimental data. Results indicate that the evaporation process is a greater resistance to overall heat transfer than conduction through the droplet itself, which is consistent with the previous results of axisymmetric volume-of-fluid (VOF) models. (C) 2012 Elsevier Ltd. All rights reserved.
C1 [Hanchak, Michael S.; Briones, Alejandro M.; Ervin, Jamie S.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Byrd, Larry W.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Hanchak, MS (reprint author), Univ Dayton, Res Inst, 300 Coll Pk, Dayton, OH 45469 USA.
EM Michael.Hanchak.ctr@wpafb.af.mil
FU US Air Force Office of Scientific Research [2303BR5P]
FX This material is based on research sponsored by US Air Force Office of
Scientific Research under Grant No. 2303BR5P. The views and conclusions
contained herein are those of the authors and should not be interpreted
as necessarily representing the official policies or endorsements,
either expressed or implied, of the US Air Force Office of Scientific
Research or the US Government.
NR 36
TC 2
Z9 2
U1 2
U2 28
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0017-9310
J9 INT J HEAT MASS TRAN
JI Int. J. Heat Mass Transf.
PD FEB
PY 2013
VL 57
IS 2
BP 473
EP 483
DI 10.1016/j.ijheatmasstransfer.2012.10.008
PG 11
WC Thermodynamics; Engineering, Mechanical; Mechanics
SC Thermodynamics; Engineering; Mechanics
GA 074YD
UT WOS:000313850100005
ER
PT J
AU Rosa, W
Packard, T
Krupanand, A
Bilbro, JW
Hodal, MM
AF Rosa, Wilson
Packard, Travis
Krupanand, Abishek
Bilbro, James W.
Hodal, Max M.
TI COTS integration and estimation for ERP
SO JOURNAL OF SYSTEMS AND SOFTWARE
LA English
DT Article
DE Enterprise Resource Planning; Effort estimation; Cost model; Schedule
estimation; Software engineering
ID PROJECTS
AB This paper presents a comprehensive set of effort and schedule estimating models for predicting Enterprise Resource Planning (ERP) implementations, available in the open literature. The first set of models uses product size to predict ERP software engineering effort as well as total integration effort. Product size is measured in terms of the number of report, interface, conversion, and extension (RICE) objects configured and customized within the commercial ERP tool. Total integration effort captures software engineering plus systems engineering, program management, change management, development test & evaluation, and training development. The second set of models predicts the duration of ERP implementation stages in terms of RICE objects, staffing, and the number of test cases. The statistical models are based on data collected from 20 programs implemented within the federal government over the course of nine years beginning in 2000. The data was collected during the time period from 2006 to 2010. The models focus on the vendor's implementation team, and therefore should be applicable to commercial ERP implementations. Finally, ERP adopters/customers can use these models to validate Vendor's Implementation Team cost proposals or estimates. (c) 2012 Elsevier Inc. All rights reserved.
C1 [Rosa, Wilson; Packard, Travis; Krupanand, Abishek] USAF, Cost Anal Agcy, Washington, MD 20762 USA.
RP Rosa, W (reprint author), USAF, Cost Anal Agcy, 1500 W Perimeter Rd,Suite 3500, Washington, MD 20762 USA.
EM wilson.rosa@pentagon.af.mil; travis.packard@pentagon.af.mil;
abishek.krupanand@pentagon.af.mil; jbci@knology.net; Max.Hodal@wyle.com
NR 28
TC 6
Z9 6
U1 0
U2 34
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0164-1212
J9 J SYST SOFTWARE
JI J. Syst. Softw.
PD FEB
PY 2013
VL 86
IS 2
BP 538
EP 550
DI 10.1016/j.jss.2012.09.030
PG 13
WC Computer Science, Software Engineering; Computer Science, Theory &
Methods
SC Computer Science
GA 071NI
UT WOS:000313600700020
ER
PT J
AU Tsang, L
Ding, KH
Huang, SW
Xu, XL
AF Tsang, Leung
Ding, Kung-Hau
Huang, Shaowu
Xu, Xiaolan
TI Electromagnetic Computation in Scattering of Electromagnetic Waves by
Random Rough Surface and Dense Media in Microwave Remote Sensing of Land
Surfaces
SO PROCEEDINGS OF THE IEEE
LA English
DT Review
DE Active remote sensing; computational electromagnetics; dense medium;
electromagnetic wave scattering; random medium; rough surface; snow;
soil
ID MONTE-CARLO SIMULATIONS; CANONICAL-GRID METHOD; QUASI-CRYSTALLINE
APPROXIMATION; DISCRETE-DIPOLE APPROXIMATION; SMALL-SLOPE APPROXIMATION;
BACKSCATTERING ENHANCEMENT; NUMERICAL SIMULATIONS; MAXWELLS EQUATIONS;
DRY SNOW; MODEL
AB Active and passive microwave remote sensing has been used for monitoring the soil moisture and snow water equivalent. In the interactions of microwaves with bare soil, the effects are determined by scattering of electromagnetic waves by random rough surfaces. In the interactions of microwaves with terrestrial snow, the effects are determined by volume scattering of dense media characterized by densely packed particles. In this paper, we review the electromagnetic full-wave simulations that we have conducted for such problems. In volume scattering problems, one needs many densely packed scatterers in a random medium sample to simulate the physical solutions. In random rough surface scattering problems, one needs many valleys and peaks in the sample surface. In random media and rough surface problems, the geometric characterizations of the media and computer generations of statistical samples of the media are also challenges besides electromagnetic computations. In the scattering of waves by soil surfaces, we consider the soil to be a lossy dielectric medium. The random rough surface is characterized by Gaussian random processes with exponential correlation functions. Surfaces of exponential correlation functions have fine-scale structures that cause significant radar backscattering in active microwave remote sensing. Fine-scale features also cause increase in emission in passive microwave remote sensing. We apply Monte Carlo simulations of solving full 3-D Maxwell's equations for such a problem. A hybrid UV/PBTG/SMCG method is developed to accelerate method of moment solutions. The results are illustrated for coherent waves and incoherent waves. We also illustrate bistatic scattering, backscattering, and emissivity which are signatures measured in microwave remote sensing. For the case of scattering by terrestrial snow, snow is a dense medium with densely packed ice grains. We have used two models: densely packed particles and bicontinuous media. For the case of densely packed particles, we used the Metropolis shuffling method to simulate the positions of particles. The particles are also allowed to have adhesive properties. The Foldy-Lax equations of multiple scattering are used to study scattering from the densely packed spherical particles. The results are illustrated for the coherent waves and incoherent waves. For the case of bicontinuous media, the method developed by Cahn is applied to construct the interfaces from a large number of stochastic sinusoidal waves with random phases and directions. The volume scattering problem is then solved by using CGS-FFT. We illustrate the results of frequency and polarization dependence of such dense media scattering.
C1 [Tsang, Leung; Huang, Shaowu; Xu, Xiaolan] Univ Washington, Dept Elect Engn, Seattle, WA 98195 USA.
[Ding, Kung-Hau] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Tsang, L (reprint author), Univ Washington, Dept Elect Engn, Seattle, WA 98195 USA.
EM tsang@ee.washington.edu
FU National Aeronautics and Space Administration (NASA); National Science
Foundation (NSF); Air Force Office of Scientific Research (AFOSR)
FX Manuscript received September 19, 2011; revised July 7, 2012; accepted
July 19, 2012. Date of publication September 27, 2012; date of current
version January 16, 2013. This work was supported by the National
Aeronautics and Space Administration (NASA) and the National Science
Foundation (NSF). The work of K.-H. Ding was supported in part by the
Air Force Office of Scientific Research (AFOSR).
NR 53
TC 19
Z9 21
U1 1
U2 40
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9219
J9 P IEEE
JI Proc. IEEE
PD FEB
PY 2013
VL 101
IS 2
SI SI
BP 255
EP 279
DI 10.1109/JPROC.2012.2214011
PG 25
WC Engineering, Electrical & Electronic
SC Engineering
GA 073DT
UT WOS:000313724400005
ER
PT J
AU Cooke, DT
David, EA
AF Cooke, David T.
David, Elizabeth A.
TI Large-Bore and Small-Bore Chest Tubes: Types, Function, and Placement
SO THORACIC SURGERY CLINICS
LA English
DT Article
DE Chest tubes; Small bore; Large bore; Effusions; French
ID MALIGNANT PLEURAL EFFUSIONS; PIGTAIL CATHETERS; DRAINAGE; COMPLICATIONS;
PNEUMOTHORAX; PERFORMANCE; MANAGEMENT; EFFICACY; SIZE
AB Large-Bore and Small-Bore Chest Tubes: Types, Function, and Placement David T. Cooke and Elizabeth A. David Chest tubes are placed in the pleural space, either surgically or percutaneously to evacuate abnormal fluid and air. Indications for chest tubes include therapeutic drainage of pleural conditions such as pneumothorax, hemothorax, empyema, chylothorax, and malignant effusions, as well as prophylaxis drainage of air, blood, and other fluids after chest surgery. This article characterizes the types of chest tubes, reviews the basic techniques for insertion, and describes the comparative effectiveness between large-bore and small-bore chest tubes.
C1 [Cooke, David T.] Univ Calif Davis, Med Ctr, Div Cardiothorac Surg, Gen Thorac Surg Program, Sacramento, CA 95817 USA.
[David, Elizabeth A.] Univ Calif Davis, Med Ctr, USAF, David Grant Med Ctr, Sacramento, CA 95817 USA.
RP Cooke, DT (reprint author), Univ Calif Davis, Med Ctr, Div Cardiothorac Surg, Gen Thorac Surg Program, 2221 Stockton Blvd,Suite 2117, Sacramento, CA 95817 USA.
EM david.cooke@ucdavis.ucdmc.edu
NR 21
TC 3
Z9 3
U1 1
U2 10
PU W B SAUNDERS CO-ELSEVIER INC
PI PHILADELPHIA
PA 1600 JOHN F KENNEDY BOULEVARD, STE 1800, PHILADELPHIA, PA 19103-2899 USA
SN 1547-4127
J9 THORAC SURG CLIN
JI Thorac. Surg. Clin.
PD FEB
PY 2013
VL 23
IS 1
BP 17
EP +
DI 10.1016/j.thorsurg.2012.10.006
PG 9
WC Respiratory System; Surgery
SC Respiratory System; Surgery
GA 075DJ
UT WOS:000313863700004
PM 23206714
ER
PT J
AU Cao, YC
Yu, WW
Ren, W
Chen, GR
AF Cao, Yongcan
Yu, Wenwu
Ren, Wei
Chen, Guanrong
TI An Overview of Recent Progress in the Study of Distributed Multi-Agent
Coordination
SO IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
LA English
DT Article
DE Distributed coordination; formation control; multi-agent system; sensor
network
ID MULTIVEHICLE COOPERATIVE CONTROL; PLANAR COLLECTIVE MOTION; MOBILE
SENSOR NETWORKS; CONSENSUS ALGORITHMS; SWITCHING-NETWORKS; VEHICLE
FORMATIONS; GOSSIP ALGORITHMS; TRACKING CONTROL; TIME-DELAYS; SYSTEMS
AB This paper reviews some main results and progress in distributed multi-agent coordination, focusing on papers published in major control systems and robotics journals since 2006. Distributed coordination of multiple vehicles, including unmanned aerial vehicles, unmanned ground vehicles, and unmanned underwater vehicles, has been a very active research subject studied extensively by the systems and control community. The recent results in this area are categorized into several directions, such as consensus, formation control, optimization, and estimation. After the review, a short discussion section is included to summarize the existing research and to propose several promising research directions along with some open problems that are deemed important for further investigations.
C1 [Cao, Yongcan] USAF, Control Sci Ctr Excellence, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Yu, Wenwu] Southeast Univ, Dept Math, Nanjing 210096, Jiangsu, Peoples R China.
[Yu, Wenwu] RMIT Univ, Sch Elect & Comp Engn, Melbourne, Vic 3001, Australia.
[Ren, Wei] Univ Calif Riverside, Dept Elect Engn, Riverside, CA 92521 USA.
[Chen, Guanrong] City Univ Hong Kong, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China.
RP Cao, YC (reprint author), USAF, Control Sci Ctr Excellence, Res Lab, Wright Patterson AFB, OH 45433 USA.
RI Ren, Wei/G-7369-2011; Yu, Wenwu/G-5496-2012;
OI Ren, Wei/0000-0002-2818-9752; Yu, Wenwu/0000-0003-3755-179X; Cao,
Yongcan/0000-0003-3383-0185; Chen, Guanrong/0000-0003-1381-7418
FU National Science Foundation [ECCS-1213291]; National Natural Science
Foundation of China [61104145, 61120106010]; Natural Science Foundation
of Jiangsu Province of China [BK2011581]; Research Fund for the Doctoral
Program of Higher Education of China [20110092120024]; Fundamental
Research Funds for the Central Universities of China; Hong Kong RGC
under GRF [CityU1114/11E]; National Research Council Research
Associateship Award at AFRL
FX This work was supported in part by the National Science Foundation under
CAREER Award ECCS-1213291, the National Natural Science Foundation of
China under Grant 61104145 and Grant 61120106010, the Natural Science
Foundation of Jiangsu Province of China under Grant BK2011581, the
Research Fund for the Doctoral Program of Higher Education of China
under Grant 20110092120024, the Fundamental Research Funds for the
Central Universities of China, and the Hong Kong RGC under GRF Grant
CityU1114/11E. The work of Y. Cao was supported by a National Research
Council Research Associateship Award at AFRL. Paper no. TII-11-375.
NR 130
TC 387
Z9 403
U1 45
U2 291
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1551-3203
EI 1941-0050
J9 IEEE T IND INFORM
JI IEEE Trans. Ind. Inform.
PD FEB
PY 2013
VL 9
IS 1
BP 427
EP 438
DI 10.1109/TII.2012.2219061
PG 12
WC Automation & Control Systems; Computer Science, Interdisciplinary
Applications; Engineering, Industrial
SC Automation & Control Systems; Computer Science; Engineering
GA 061HR
UT WOS:000312839600045
ER
PT J
AU Varshney, V
Roy, AK
Michalak, TJ
Lee, J
Farmer, BL
AF Varshney, Vikas
Roy, Ajit K.
Michalak, Tyler J.
Lee, Jonghoon
Farmer, Barry L.
TI Effect of Curing and Functionalization on the Interface Thermal
Conductance in Carbon Nanotube-Epoxy Composites
SO JOM
LA English
DT Article
ID MOLECULAR-DYNAMICS; HEAT-FLOW; CONDUCTIVITY; RESISTANCE; ENHANCEMENT;
SUSPENSIONS; TRANSPORT
AB This study investigates the interface thermal conductance in a functionalized carbon nanotube (CNT)-epoxy composite system and how it is modified when the surrounding matrix is cured. We have used nonequilibrium molecular dynamics simulations to study the interface thermal conductance in both cured and uncured matrices, based on diglycidyl ether of bisphenol F (EPON-862) and diethylenetoluenediamine. The functionalization is modeled using a dynamic crosslinking algorithm and represents a realistic model of the matrix-filler interface. The thermal interface conductance increases linearly with the degree of functionalization up to the studied 2.5% due to stronger thermal coupling between functionalized CNT and the matrix. In addition, it was observed that curing of the matrix increases the interface conductance by 20% relative to the uncured matrix. This increase is attributed to an increase in thermal conductivity of cured epoxy resulting from relative enhancement in nonbonded interactions (originating from volume reduction) and structural rigidity during curing. Our results suggest that the interface conductance can be strongly influenced by the thermal properties of the bulk matrix as well as the interface chemistry of the additives such as CNTs.
C1 [Varshney, Vikas; Roy, Ajit K.; Lee, Jonghoon; Farmer, Barry L.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Varshney, Vikas; Lee, Jonghoon] Univ Technol Corp, Dayton, OH 45432 USA.
[Michalak, Tyler J.] SUNY Albany, Coll Nanoscale Sci & Engn, Albany, NY 12203 USA.
RP Varshney, V (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM vikas.varshney@wpafb.af.mil; ajit.roy@wpafb.af.mil
FU Air Force Office of Scientific Research Lab [2302BR7P]; Minority Leaders
Program
FX The authors thank Dr. Byung-Lip (Les) Lee (Air Force Office of
Scientific Research Lab Task# 2302BR7P) and Minority Leaders Program for
the financial support for this work. The authors also gratefully
acknowledge the Air Force Research Laboratory Department of Defense
Supercomputing Resource Center (AFRL-DSRC) High Performance Computing
for the computational resources to carry out reported simulations.
NR 27
TC 5
Z9 5
U1 3
U2 67
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD FEB
PY 2013
VL 65
IS 2
BP 140
EP 146
DI 10.1007/s11837-012-0505-z
PG 7
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 064HM
UT WOS:000313064800005
ER
PT J
AU Moller, JC
Barr, SA
Schultz, EJ
Breitzman, TD
Berry, RJ
AF Moller, J. C.
Barr, S. A.
Schultz, E. J.
Breitzman, T. D.
Berry, R. J.
TI Simulation of Fracture Nucleation in Cross-Linked Polymer Networks
SO JOM
LA English
DT Article
ID MOLECULAR-DYNAMICS SIMULATIONS; MODEL EPOXY THERMOSETS;
POSITRON-ANNIHILATION; VOLUMETRIC PROPERTIES; STRESSED POLYMERS;
YIELDING BEHAVIOR; DEFORMATION; MECHANISM; SPECTROSCOPY; DIFFUSION
AB A novel atomistic simulation method is developed whereby polymer systems can undergo strain-rate-controlled deformation while bond scission is enabled. The aim is to provide insight into the nanoscale origins of fracture. Various highly cross-linked epoxy systems including various resin chain lengths and levels of nonreactive dilution were examined. Consistent with the results of physical experiments, cured resin strength increased and ductility decreased with increasing cross-link density. An analysis of dihedral angle activity shows the locations in the molecular network that are most absorptive of mechanical energy. Bond scission occurred principally at cross-link sites as well as between phenyl rings in the bisphenol moiety. Scissions typically occurred well after yield and were accompanied by steady increases in void size and dihedral angle motion between bisphenol moieties and at cross-link sites. The methods developed here could be more broadly applied to explore and compare the atomistic nature of deformation for various polymers such that mechanical and fracture properties could be tuned in a rational way. This method and its results could become part of a solution system that spans multiple length and time scales and that could more completely represent such mechanical events as fracture.
C1 [Moller, J. C.; Barr, S. A.; Schultz, E. J.; Breitzman, T. D.] USAF, Res Lab, Composites Branch, Wright Patterson AFB, OH 45433 USA.
[Moller, J. C.] Miami Univ, Dept Mech & Mfg Engn, Oxford, OH 45056 USA.
[Barr, S. A.] Univ Technol Corp, Dayton, OH 45432 USA.
[Schultz, E. J.] Chenega Fed Syst LLC, Lorton, VA 22079 USA.
[Berry, R. J.] USAF, Res Lab, Soft Matter Branch, Wright Patterson AFB, OH 45433 USA.
RP Moller, JC (reprint author), USAF, Res Lab, Composites Branch, 2941 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM mollerjc@muohio.edu
FU Low Density Materials program of the U.S. Air Force Office of Scientific
Research [11RX06COR]; Air Force Materials and Manufacturing Directorate
[FA8650-07-D-5800]
FX This work is supported by the Low Density Materials program of the U.S.
Air Force Office of Scientific Research task number 11RX06COR and Air
Force Materials and Manufacturing Directorate contract number
FA8650-07-D-5800. The facilities of the U.S. Air Force Research
Laboratory-Department of Defense Supercomputing Resource Center were
also utilized.
NR 48
TC 12
Z9 12
U1 0
U2 40
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD FEB
PY 2013
VL 65
IS 2
BP 147
EP 167
DI 10.1007/s11837-012-0511-1
PG 21
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 064HM
UT WOS:000313064800006
ER
PT J
AU Sinha, V
Spowart, JE
AF Sinha, V.
Spowart, J. E.
TI Influence of interfacial carbide layer characteristics on thermal
properties of copper-diamond composites
SO JOURNAL OF MATERIALS SCIENCE
LA English
DT Article
ID METAL-MATRIX COMPOSITES; HEAT SINK APPLICATIONS; NONCONDUCTING
INCLUSIONS; ELECTRICAL-CONDUCTIVITY; CU/DIAMOND COMPOSITES;
POWDER-METALLURGY; EXPANSION; FABRICATION; RESISTANCE; CR
AB Copper-diamond composites are increasingly being considered for thermal management applications because of their attractive combination of properties, such as high thermal conductivity (lambda) and low coefficient of thermal expansion (CTE). In this research, thermal properties of Cu-diamond composites with two different types of interfacial carbides (Cr3C2 and SiC) were studied. The interface thermal conductance (h(c)) was calculated with Maxwell mean-field and differential effective medium schemes, wherein experimentally measured lambda was entered as an input parameter. The lambda and h(c) of both the Cu-Cr3C2-diamond and Cu-SiC-diamond composites are higher than those reported in previous studies for Cu-diamond composites with no interfacial carbides. The value of h(c) is intimately related to the morphology and thickness of the interface carbide layer, with the highest h(c) being associated with a thin and continuous interface carbide layer. A lower h(c) resulting from a thicker Cr3C2 layer can provide an alternate explanation for a previously reported trend in lambda of Cu-Cr3C2-diamond composites with different Cr-contents. The experimentally measured CTE was compared with the Turner and Kerner model predictions. The CTE of both the Cu-Cr3C2-diamond and Cu-SiC-diamond composites is lower and better matches the model predictions than the previously reported CTE of Cu-diamond composite with no interfacial carbides. The CTE of Cu-Cr3C2-diamond composites agrees better with the Kerner model than the Turner model, which suggests that deformation during temperature excursions involves shear.
C1 [Sinha, V.; Spowart, J. E.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Sinha, V.] UES Inc, Dayton, OH 45432 USA.
RP Sinha, V (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM vikas.sinha@wpafb.af.mil
FU Air Force Office of Scientific Research [11RX02COR];
[F33615-04-D-5235]; [FA8650-10-D-5226]
FX This research was supported by Air Force Office of Scientific Research
under Thermal Sciences Portfolio (Program Manager: Dr. Joan Fuller, LRIR
# 11RX02COR) and performed at Air Force Research Laboratory, Materials
and Manufacturing Directorate (Contract # F33615-04-D-5235 and
FA8650-10-D-5226). The authors thank Dr. S. Ganguli (UDRI) and Dr. A.
Roy (AFRL) for help in initiating thermal property measurements. Dr. F.
Meisenkothen (UES, Inc.) and Mr. Jared Shank (UES, Inc.) helped with the
carbide layer thickness measurements via EPMA-GMRFILM Model. Drs. C.
Muratore and B.M. Howe (both at AFRL) helped with the Profilometry and
Rutherford Backscattering Spectrometry experiments to determine the
thickness of metal thin films. We acknowledge the assistance of Mr. Bob
Lewis (UES, Inc.) with acid dissolution experiments and with specimen
preparation for microstructural examination. Thanks to Mr. Henry "Mic"
Meeks of AM2T, LLC (formerly Ceracon, Inc.) for providing
consolidated Cu-SiC-diamond composite, and to Dr. Thomas Schubert (IFAM,
Dresden, Germany) for providing virgin diamond particles for nitrogen
analysis.
NR 36
TC 11
Z9 11
U1 8
U2 63
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0022-2461
J9 J MATER SCI
JI J. Mater. Sci.
PD FEB
PY 2013
VL 48
IS 3
BP 1330
EP 1341
DI 10.1007/s10853-012-6878-0
PG 12
WC Materials Science, Multidisciplinary
SC Materials Science
GA 062FO
UT WOS:000312904900043
ER
PT J
AU El-Awady, JA
Uchic, MD
Shade, PA
Kim, SL
Rao, SI
Dimiduk, DM
Woodward, C
AF El-Awady, Jaafar A.
Uchic, Michael D.
Shade, Paul A.
Kim, Sang-Lan
Rao, Satish I.
Dimiduk, Dennis M.
Woodward, Christopher
TI Pre-straining effects on the power-law scaling of size-dependent
strengthening in Ni single crystals
SO SCRIPTA MATERIALIA
LA English
DT Article
DE Dislocation density; Size effects; Pre-straining; Nickel microcrystals;
Discrete dislocation dynamics
ID DISLOCATION; COMPRESSION; PLASTICITY; PILLARS; FLOW
AB We report experimental and three-dimensional discrete dislocation dynamics measurements to characterize the effect of high starting dislocation density on size-affected flow. Microcrystals were focused ion beam milled into a pre-strained bulk Ni single crystal to obtain a dense heterogeneous dislocation cell structure. The strength-scaling exponent is shown to decreases considerably with increasing dislocation density. Cutting the pre-existing forest during microcrystal fabrication can lead to alternate pathways for the advancing slipped areas to defeat the forest, resulting in a lower strength than the pre-strained bulk crystal. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [El-Awady, Jaafar A.] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA.
[Uchic, Michael D.; Shade, Paul A.; Dimiduk, Dennis M.; Woodward, Christopher] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Kim, Sang-Lan; Rao, Satish I.] UES Inc, Dayton, OH USA.
RP El-Awady, JA (reprint author), Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA.
EM jelawady@jhu.edu
RI Shade, Paul/H-6459-2011; El-Awady, Jaafar/E-8551-2010
OI El-Awady, Jaafar/0000-0002-5715-2481
FU U.S. Air Force Research Laboratory (AFRL), Materials and Manufacturing
Directorate; DoD High-Performance Computing Modernization Program at the
AFRL-DoD Supercomputing Research Center (AFRL-DSRC)
FX Support from the U.S. Air Force Research Laboratory (AFRL), Materials
and Manufacturing Directorate, and by computer resources grant from the
DoD High-Performance Computing Modernization Program at the AFRL-DoD
Supercomputing Research Center (AFRL-DSRC).
NR 23
TC 26
Z9 26
U1 1
U2 56
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6462
J9 SCRIPTA MATER
JI Scr. Mater.
PD FEB
PY 2013
VL 68
IS 3-4
BP 207
EP 210
DI 10.1016/j.scriptamat.2012.10.035
PG 4
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 055NE
UT WOS:000312422800011
ER
PT J
AU Anderson, BE
Blocher, JD
Bretthauer, KM
Venkataramanan, MA
AF Anderson, Bradley E.
Blocher, James D.
Bretthauer, Kurt M.
Venkataramanan, Munirpallam A.
TI An efficient network-based formulation for sequence dependent setup
scheduling on parallel identical machines
SO MATHEMATICAL AND COMPUTER MODELLING
LA English
DT Article
DE Sequence-dependent setups; Scheduling; Mixed integer programming;
Earliness; Tardiness
ID MULTIPLE TIME WINDOWS; TARDINESS PENALTIES; EARLINESS
AB This paper compares the efficacy of a newly developed network-based mixed-integer programming (MIP) formulation with three existing formulations for the sequence dependent setup scheduling problem with earliness/tardiness penalties. This research shows that the new model is more efficient in terms of computation time for larger multi-machine problems than the existing formulations of these problems. The mixed-integer nature of the formulation allows companies to solve this class of problems with any one of many commonly available integer programming software packages. The presented MIP formulation provides a unique and useful method of conceptualizing and modeling a practical, yet difficult, problem within industry. Published by Elsevier Ltd
C1 [Anderson, Bradley E.] USAF, Dept Operat Sci, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Blocher, James D.; Bretthauer, Kurt M.; Venkataramanan, Munirpallam A.] Indiana Univ, Dept Operat & Decis Technol, Kelley Sch Business, Bloomington, IN 47405 USA.
RP Anderson, BE (reprint author), USAF, Dept Operat Sci, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM bradley_anderson@sbcglobal.net
NR 10
TC 2
Z9 2
U1 0
U2 13
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0895-7177
J9 MATH COMPUT MODEL
JI Math. Comput. Model.
PD FEB
PY 2013
VL 57
IS 3-4
BP 483
EP 493
DI 10.1016/j.mcm.2012.06.029
PG 11
WC Computer Science, Interdisciplinary Applications; Computer Science,
Software Engineering; Mathematics, Applied
SC Computer Science; Mathematics
GA 048LA
UT WOS:000311911700016
ER
PT J
AU Vernon, JP
Zhao, AD
Vergara, R
Song, H
Tondiglia, VP
White, TJ
Tabiryan, NV
Bunning, TJ
AF Vernon, Jonathan P.
Zhao, Aaron D.
Vergara, Rafael
Song, Hyunmin
Tondiglia, Vincent P.
White, Timothy J.
Tabiryan, Nelson V.
Bunning, Timothy J.
TI Photostimulated control of laser transmission through photoresponsive
cholesteric liquid crystals
SO OPTICS EXPRESS
LA English
DT Article
ID CHIRAL DOPANTS; PITCH; HOST
AB Cholesteric liquid crystals (CLCs) are selectively reflective optical materials, the color of which can be tuned via electrical, thermal, mechanical, or optical stimuli. In this work, we show that self-regulation of the transmission of a circularly polarized incident beam can occur upon phototuning of the selective reflection peak of a photosensitive CLC mixture towards the pump wavelength. The autonomous behavior occurs as the red-shifting selective reflection peak approaches the wavelength of the incident laser light. Once the red-edge of the CLC bandgap and incident laser wavelength overlap, the rate of tuning dramatically slows. The dwell time (i.e., duration of the overlap of stimulus wavelength with CLC bandgap) is shown to depend on the radiation wavelength, polarization, and intensity. Necessary conditions for substantial dwell time of the CLC reflection peak at the pump beam wavelength include irradiation with low intensity light (similar to 1mW/cm(2)) and the utilization of circularly polarized light of the same handedness as the helical structure within the CLC. Monitoring the optical properties in both reflection and transmission geometries elucidates differences associated with attenuation of the light through the thickness of the CLC film. (C)2013 Optical Society of America
C1 [Vernon, Jonathan P.; Zhao, Aaron D.; Tondiglia, Vincent P.; White, Timothy J.; Bunning, Timothy J.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Vernon, Jonathan P.; Zhao, Aaron D.] Azimuth Corp, Dayton, OH 45432 USA.
[Vergara, Rafael; Tabiryan, Nelson V.] Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
[Song, Hyunmin] ExxonMobil Chem Co, Baytown, TX 77521 USA.
[Tondiglia, Vincent P.] SAIC Inc, Dayton, OH 45431 USA.
RP Vernon, JP (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM timothy.bunning@wpafb.af.mil
RI White, Timothy/D-4392-2012
FU Air Force Office of Scientific Research; Materials and Manufacturing
Directorate of the Air Force Research Laboratory; DoD SBIR program
FX This work was funded by the Air Force Office of Scientific Research, the
Materials and Manufacturing Directorate of the Air Force Research
Laboratory, and the DoD SBIR program.
NR 31
TC 5
Z9 5
U1 0
U2 36
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD JAN 28
PY 2013
VL 21
IS 2
BP 1645
EP 1655
DI 10.1364/OE.21.001645
PG 11
WC Optics
SC Optics
GA 104JT
UT WOS:000315989500033
PM 23389150
ER
PT J
AU Huang, SY
Wu, BL
Foong, SH
AF Huang, Shao Ying
Wu, Bae-lan
Foong, Shaohui
TI Surface-enhanced Raman scattering enhancement factor distribution for
nanoparticles of arbitrary shapes using surface integral equation method
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID DISCRETE-DIPOLE APPROXIMATION; ELECTROMAGNETIC-FIELDS; SERS; OPTICS
AB Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) surface integral equation method is applied for the first time to accurately estimate the surface-enhanced Raman scattering (SERS) enhancement factor distribution for arbitrary nanoparticles and nano-aggregates. It is the first time in literature that the distributions of SERS enhancement factors of nanoparticles of a large variety are reported. It is shown that not every SERS substrate exhibits a long-tail distribution as a dimer consisting of two spheres in close proximity. Generic methods are proposed to evaluate the performance of nanoparticles on SERS substrates. A cumulative distribution is proposed to examine the contributions of hot and warm spots around the nanoparticles. It is used to identify the importance of warm spots on a SERS substrate. A parameter q is proposed to describe the likelihood of a randomly positioned molecule that can be activated. This study provides guidance and insights for the optimization of SERS substrate fabrication techniques. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4789022]
C1 [Huang, Shao Ying] MIT, Elect Res Lab, Cambridge, MA 02139 USA.
[Huang, Shao Ying; Foong, Shaohui] Singapore Univ Technol & Design, Singapore 138682, Singapore.
[Wu, Bae-lan] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Huang, SY (reprint author), MIT, Elect Res Lab, Cambridge, MA 02139 USA.
EM shaoying@mit.edu
NR 22
TC 2
Z9 2
U1 3
U2 21
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD JAN 28
PY 2013
VL 113
IS 4
AR 044304
DI 10.1063/1.4789022
PG 7
WC Physics, Applied
SC Physics
GA 086XZ
UT WOS:000314724500106
ER
PT J
AU Lewis, WK
Rumchik, CG
Smith, MJ
Fernando, KAS
Crouse, CA
Spowart, JE
Guliants, EA
Bunker, CE
AF Lewis, W. K.
Rumchik, C. G.
Smith, M. J.
Fernando, K. A. S.
Crouse, C. A.
Spowart, J. E.
Guliants, E. A.
Bunker, C. E.
TI Comparison of post-detonation combustion in explosives incorporating
aluminum nanoparticles: Influence of the passivation layer
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID EMISSION-SPECTROSCOPY; FLAME; CHEMILUMINESCENCE; REACTIVITY; TRANSITION;
AIR
AB Aluminum nanoparticles and explosive formulations that incorporate them have been a subject of ongoing interest due to the potential of aluminum particles to dramatically increase energy content relative to conventional organic explosives. We have used time-resolved atomic and molecular emission spectroscopy to monitor the combustion of aluminum nanoparticles within the overall chemical dynamics of post-detonation fireballs. We have studied the energy release dynamics of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) charges incorporating three types of aluminum nanoparticles: commercial oxide-passivated nanoparticles, oleic acid-capped aluminum nanoparticles (AlOA), and nanoparticles in which the oxide shell of the particle has been functionalized with an acrylic monomer and copolymerized into a fluorinated acrylic matrix (AlFA). The results indicate that the commercial nanoparticles and the AlFA nanoparticles are oxidized at a similar rate, while the AlOA nanoparticles combust more quickly. This is most likely due to the fact that the commercial nano-Al and the AlFA particles are both oxide-passivated, while the AlOA particles are protected by an organic shell that is more easily compromised than an oxide layer. The peak fireball temperatures for RDX charges containing 20 wt. % of commercial nano-Al, AlFA, or AlOA were similar to 3900 K, similar to 3400 K, and similar to 4500 K, respectively. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4790159]
C1 [Lewis, W. K.; Fernando, K. A. S.; Guliants, E. A.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Rumchik, C. G.] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
[Smith, M. J.; Bunker, C. E.] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
[Crouse, C. A.; Spowart, J. E.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Crouse, C. A.] UES Inc, Dayton, OH 45432 USA.
RP Lewis, WK (reprint author), Univ Dayton, Res Inst, Dayton, OH 45469 USA.
EM wlewis2@udayton.edu
FU Air Force Research Laboratory under NanoEnergetics Program; Air Force
Office of Scientific Research (AFOSR); Defense Threat Reduction Agency
(DTRA) [HDTRA-07-1-0026]
FX The authors gratefully acknowledge funding and facilities provided for
this work by the Air Force Research Laboratory under the NanoEnergetics
Program, funding from the Air Force Office of Scientific Research
(AFOSR) through the support of Dr. Michael Berman, and the financial
support of the Defense Threat Reduction Agency (DTRA, Grant No.
HDTRA-07-1-0026) for development of the AlOA particles. We would also
like to thank Mr. Rick Beesley and Mr. Mark Grimmonpre for their
assistance in conducting these experiments.
NR 29
TC 4
Z9 5
U1 4
U2 31
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD JAN 28
PY 2013
VL 113
IS 4
AR 044907
DI 10.1063/1.4790159
PG 5
WC Physics, Applied
SC Physics
GA 086XZ
UT WOS:000314724500148
ER
PT J
AU Lorenz, A
Zimmermann, N
Kumar, S
Evans, DR
Cook, G
Martinez, MF
Kitzerow, HS
AF Lorenz, Alexander
Zimmermann, Natalie
Kumar, Satyendra
Evans, Dean R.
Cook, Gary
Martinez, Manuel Fernandez
Kitzerow, Heinz-S
TI Doping a Mixture of Two Smectogenic Liquid Crystals with Barium Titanate
Nanoparticles
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID X-RAY-SCATTERING; SMECTIC-A-PHASE; ORDER-PARAMETER; BINARY-MIXTURES;
TRANSITION; PARTICLES; DYNAMICS; DISORDER
AB A mixture of two smectic liquid crystals was doped with harvested ferroelectric barium titanate nanoparticles and investigated with wide- and small-angle X-ray scattering during cooling from the isotropic phase. A decrease in the isotropic to nematic and in the nematic to partially bilayer smectic-A(d) (SmA(d)) phase transition temperatures was observed accompanied by an increase of the layer spacing in the SmA(d) phase.
C1 [Lorenz, Alexander; Zimmermann, Natalie; Kitzerow, Heinz-S] Univ Paderborn, Dept Chem, D-33098 Paderborn, Germany.
[Kumar, Satyendra] Kent State Univ, Dept Phys, Kent, OH 44242 USA.
[Evans, Dean R.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Cook, Gary] Azimuth Corp, Dayton, OH 45432 USA.
[Martinez, Manuel Fernandez] European Synchrotron Radiat Facil, F-38043 Grenoble, France.
RP Kitzerow, HS (reprint author), Univ Paderborn, Dept Chem, Warburger Str 100, D-33098 Paderborn, Germany.
EM heinz.kitzerow@uni-paderborn.de
FU German Research Foundation [KI 411/14, GRK 1464]; European Science
Foundation (EUROCORES, SONS II); European Synchrotron Radiation Facility
(ESRF); US Department of Energy, Office of Science, Basic Energy
Sciences [DE-SC0001412]
FX The authors would like to express their gratitude to Theyencheri
Narayanan (ESRF) for his excellent support and valuable discussions.
Financial support by the German Research Foundation (KI 411/14 and GRK
1464), the European Science Foundation (EUROCORES, SONS II,
"Self-organized nanostructures"), the European Synchrotron Radiation
Facility (ESRF), and (S.K.) the US Department of Energy, Office of
Science, Basic Energy Sciences grant DE-SC0001412 is gratefully
acknowledged.
NR 35
TC 8
Z9 8
U1 1
U2 38
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1520-6106
J9 J PHYS CHEM B
JI J. Phys. Chem. B
PD JAN 24
PY 2013
VL 117
IS 3
BP 937
EP 941
DI 10.1021/jp310624c
PG 5
WC Chemistry, Physical
SC Chemistry
GA 079XJ
UT WOS:000314205200022
PM 23244774
ER
PT J
AU Roslyak, O
Gumbs, G
Huang, DH
AF Roslyak, O.
Gumbs, Godfrey
Huang, Danhong
TI Plasmons in single- and double-component helical liquids: Application to
two-dimensional topological insulators
SO PHYSICAL REVIEW B
LA English
DT Article
ID PHASE-TRANSITION; SUPERCONDUCTORS; EXCITATIONS
AB The plasmon excitations in proposed single- and double-component helical liquid (HL) models are investigated within the random-phase approximation by calculating the density-density, spin-density, and spin-spin waves. The effect due to broken time-reversal symmetry on intraband-plasmon dispersion relation in the single-component HL system is analyzed and compared to those of well-known cases, such as conventional quasi-one-dimensional electron gases and armchair graphene nanoribbons. In the long-wavelength limit, the dispersion of the collective excitations provided by the density-density response of the single-component HL matches that of spin-density response of the two-component HL. DOI: 10.1103/PhysRevB.87.045121
C1 [Roslyak, O.] Los Alamos Natl Lab, Los Alamos, NM 87544 USA.
[Roslyak, O.; Gumbs, Godfrey] CUNY Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA.
[Huang, Danhong] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Roslyak, O (reprint author), Los Alamos Natl Lab, 4200 W Jemez Rd 300, Los Alamos, NM 87544 USA.
EM avroslyak@gmail.com
FU AFRL [FA9453-11-01-0263]; Air Force Office of Scientific Research
(AFOSR)
FX This research was supported by the Contract No. FA9453-11-01-0263 of
AFRL. D.H. would like to thank the Air Force Office of Scientific
Research (AFOSR) for its support.
NR 17
TC 4
Z9 4
U1 0
U2 19
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD JAN 22
PY 2013
VL 87
IS 4
AR 045121
DI 10.1103/PhysRevB.87.045121
PG 7
WC Physics, Condensed Matter
SC Physics
GA 076FF
UT WOS:000313941200007
ER
PT J
AU Chen, B
Bastian, TS
White, SM
Gary, DE
Perley, R
Rupen, M
Carlson, B
AF Chen, Bin
Bastian, T. S.
White, S. M.
Gary, D. E.
Perley, R.
Rupen, M.
Carlson, B.
TI TRACING ELECTRON BEAMS IN THE SUN'S CORONA WITH RADIO DYNAMIC IMAGING
SPECTROSCOPY
SO ASTROPHYSICAL JOURNAL LETTERS
LA English
DT Article
DE Sun: corona; Sun: flares; Sun: magnetic topology; Sun: radio radiation
ID MAGNETIC RECONNECTION; SOLAR-FLARE; X-RAYS; BURSTS; EMISSION; SPIKES;
PLASMA; YOHKOH; JETS
AB We report observations of type III radio bursts at decimeter wavelengths (type IIIdm bursts)-signatures of suprathermal electron beams propagating in the low corona-using the new technique of radio dynamic imaging spectroscopy provided by the recently upgraded Karl G. Jansky Very Large Array. For the first time, type IIIdm bursts were imaged with high time and frequency resolution over a broad frequency band, allowing electron beam trajectories in the corona to be deduced. Together with simultaneous hard X-ray and extreme ultraviolet observations, we show that these beams emanate from an energy release site located in the low corona at a height below similar to 15 Mm, and propagate along a bundle of discrete magnetic loops upward into the corona. Our observations enable direct measurements of the plasma density along the magnetic loops, and allow us to constrain the diameter of these loops to be less than 100 km. These overdense and ultra-thin loops reveal the fundamentally fibrous structure of the Sun's corona. The impulsive nature of the electron beams, their accessibility to different magnetic field lines, and the detailed structure of the magnetic release site revealed by the radio observations indicate that the localized energy release is highly fragmentary in time and space, supporting a bursty reconnection model that involves secondary magnetic structures for magnetic energy release and particle acceleration.
C1 [Chen, Bin] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
[Bastian, T. S.] Natl Radio Astron Observ, Charlottesville, VA 22903 USA.
[White, S. M.] USAF, Res Lab, Kirtland AFB, NM USA.
[Gary, D. E.] New Jersey Inst Technol, Ctr Solar Terr Res, Newark, NJ 07102 USA.
[Perley, R.; Rupen, M.] Natl Radio Astron Observ, Socorro, NM 87801 USA.
[Carlson, B.] Natl Res Council Canada, Penticton, BC V2A 6J9, Canada.
RP Chen, B (reprint author), Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
OI Gary, Dale/0000-0003-2520-8396
FU NSF [AGS-1010652]; NRAO through the Resident Shared Risk Observing
program
FX The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc. The authors thank the teams of SDO/AIA, SDO/HMI,
STEREO/EUVI, STEREO/WAVES and RHESSI for providing the relevant data. B.
C. acknowledges support by NSF grant AGS-1010652 to the University of
Virginia and support from the NRAO through the Resident Shared Risk
Observing program.
NR 37
TC 13
Z9 13
U1 0
U2 7
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 2041-8205
EI 2041-8213
J9 ASTROPHYS J LETT
JI Astrophys. J. Lett.
PD JAN 20
PY 2013
VL 763
IS 1
AR L21
DI 10.1088/2041-8205/763/1/L21
PG 6
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 071CY
UT WOS:000313564500021
ER
PT J
AU Shellhamer, DF
Bunting, SA
Hickle, KR
Horn, PC
Milligan, JC
Shipowick, DE
Smith, LB
Vandenbroek, DJ
Perry, MC
Boatz, JA
AF Shellhamer, Dale F.
Bunting, Summer A.
Hickle, Kelli R.
Horn, Parker C.
Milligan, Jacob C.
Shipowick, Danielle E.
Smith, Lincoln B.
Vandenbroek, David J.
Perry, Marc C.
Boatz, Jerry A.
TI Kinetic Studies on the Reaction of Chlorosulfonyl Isocyanate with
Monofluoroalkenes: Experimental Evidence for Both Stepwise and Concerted
Mechanisms and a Pre-equilibrium Complex on the Reaction Pathway
SO JOURNAL OF ORGANIC CHEMISTRY
LA English
DT Article
ID OPEN-SHELL; OLEFINS; CYCLOADDITION; DENSITY; SYSTEMS
AB Chlorosulfonyl isocyanate (CSI) is reported to react with hydrocarbon alkenes by a stepwise dipolar pathway to give N-chlorosulfonyl-beta-lactams that are readily reduced to beta-lactams. Substitution of a vinyl hydrogen for a vinyl fluorine changes the dynamics for reaction with CSI so that a concerted pathway is favored. Rate constants were measured for reactions of CSI with monofluoroalkenes and some hydrocarbon alkenes. Activation parameters for two hydrocarbon alkenes and two monofluoroalkenes support this change in mechanism. A plot generated from the natural log of rate constants vs ionization potentials (IP) indicates that fluoroalkenes with IP values >8.9 eV react by a concerted process. Electron-rich monofluoroalkenes with IP values <8.5 eV were found to react by a single-electron transfer (SET) pathway. Hydrocarbon alkenes were also found to react by this dipolar stepwise SET intermediate rather than the previously accepted stepwise dipolar pathway. Data support a pre-equilibrium complex on the reaction pathway just before the rate-determining step of the concerted pathway and a SET intermediate for the stepwise reactions. When the reactions are carried out at lower temperatures, the equilibrium shifts toward the complex or SET intermediate enhancing the synthetic utility of these reactions. Kinetic data also support formation of a planar transition state rather than the orthogonal geometry as reported for ketene [2 + 2] cycloadditions.
C1 [Shellhamer, Dale F.; Bunting, Summer A.; Hickle, Kelli R.; Horn, Parker C.; Milligan, Jacob C.; Shipowick, Danielle E.; Smith, Lincoln B.; Vandenbroek, David J.; Perry, Marc C.] Point Loma Nazarene Univ, Dept Chem, San Diego, CA 92106 USA.
[Boatz, Jerry A.] USAF, Res Lab, Edwards AFB, CA 93524 USA.
RP Shellhamer, DF (reprint author), Point Loma Nazarene Univ, Dept Chem, San Diego, CA 92106 USA.
EM dshellha@pointloma.edu
FU National Science Foundation (NSF-RUI) [CHE-0640547]; Research Associates
of Point Loma University (PLNU); National Science Foundation (NSF MRI)
[CHE-0417731]
FX Support for this work was provided by the National Science Foundation
(NSF-RUI Grant No. CHE-0640547) and Research Associates of Point Loma
University (PLNU), our science alumni support group. We also acknowledge
our use of the 400 MHz NMR at the University of San Diego obtained by
support from the National Science Foundation (NSF MRI Grant No.
CHE-0417731).
NR 35
TC 1
Z9 1
U1 3
U2 20
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0022-3263
J9 J ORG CHEM
JI J. Org. Chem.
PD JAN 18
PY 2013
VL 78
IS 2
BP 246
EP 252
DI 10.1021/jo3016488
PG 7
WC Chemistry, Organic
SC Chemistry
GA 077DS
UT WOS:000314008700005
PM 23237081
ER
PT J
AU Pan, SJ
Kota, AK
Mabry, JM
Tuteja, A
AF Pan, Shuaijun
Kota, Arun K.
Mabry, Joseph M.
Tuteja, Anish
TI Superomniphobic Surfaces for Effective Chemical Shielding
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID CONTACT-ANGLE HYSTERESIS; OIL-REPELLENT SURFACES; SUPERHYDROPHOBIC
SURFACES; SUPEROLEOPHOBIC SURFACES; DROP IMPACT; ALUMINUM; FILMS;
OLEOPHOBICITY; WETTABILITY; INTERFACES
AB Superomniphobic surfaces display contact angles >150 degrees and low contact angle hysteresis with essentially all contacting liquids. In this work, we report surfaces that display superomniphobicity with a range of different non-Newtonian liquids, in addition to superomniphobicity with a wide range of Newtonian liquids. Our surfaces possess hierarchical scales of re-entrant texture that significantly reduce the solid-liquid contact area. Virtually all liquids including concentrated organic and inorganic acids, bases, and solvents, as well as viscoelastic polymer solutions, can easily roll off and bounce on our surfaces. Consequently, they serve as effective chemical shields against virtually all liquids-organic or inorganic, polar or nonpolar, Newtonian or non-Newtonian.
C1 [Pan, Shuaijun; Kota, Arun K.; Tuteja, Anish] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA.
[Mabry, Joseph M.] USAF, Rocket Prop Div, Res Lab, Edwards AFB, CA 93524 USA.
RP Tuteja, A (reprint author), Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA.
EM atuteja@umich.edu
FU Air Force Office of Scientific Research (AFOSR) [FA9550-11-1-0017,
LRIR-12RZ03COR]; Hunan University; China Scholarship Council
FX We thank Dr. Charles Y.-C. Lee and the Air Force Office of Scientific
Research (AFOSR) for financial support under grants FA9550-11-1-0017 and
LRIR-12RZ03COR. We also thank the donors of the American Chemical
Society Petroleum Research Fund. S.P. thanks Dr. Weijian Xu, Hunan
University, and the China Scholarship Council for financial support.
NR 47
TC 127
Z9 133
U1 19
U2 293
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0002-7863
J9 J AM CHEM SOC
JI J. Am. Chem. Soc.
PD JAN 16
PY 2013
VL 135
IS 2
BP 578
EP 581
DI 10.1021/ja310517s
PG 4
WC Chemistry, Multidisciplinary
SC Chemistry
GA 075XP
UT WOS:000313920800013
PM 23265660
ER
PT J
AU Sandhu, SS
Fellner, JP
AF Sandhu, Sarwan S.
Fellner, Joseph P.
TI Model formulation and simulation of a solid-state lithium-based cell
SO ELECTROCHIMICA ACTA
LA English
DT Article
DE Lithium; Solid-state; Modeling; Diffusion; Transient; Thermodynamics
ID CATHODE MATERIALS
AB The analytical formulation presented here is for the prediction of the performance of a solid-state lithium anode/lithium-insertion cathode cell that is limited by solid-state diffusion in the cathode active material. Transient, dimensionless solid-state lithium-ion concentration-incorporating group profiles have been computed for a cell whose performance is controlled by lithium-ion diffusion in the cathode active material. The analytical equation for the voltage loss associated with solid-state lithium-ion diffusion and the resultant solid-state lithium-ion concentration profile in the cathode active material has been developed. To provide examples of the application of the developed formulation, generated numerical data are shown in the form of plots. Preliminary determination of the lithium ion diffusion coefficient in a dilithium phthalocyanine cathode active material from cell discharge data, and the determination of the activity coefficient and reversible cell voltage of an aerogel-based LiV2O5 cathode active material as a function of lithium intercalation have been performed. (C) 2012 Elsevier Ltd. All rights reserved.
C1 [Sandhu, Sarwan S.] Univ Dayton, Dept Chem & Mat Engn, Dayton, OH 45469 USA.
[Fellner, Joseph P.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Sandhu, SS (reprint author), Univ Dayton, Dept Chem & Mat Engn, Dayton, OH 45469 USA.
EM ssandhu1@udayton.edu
NR 13
TC 0
Z9 0
U1 1
U2 14
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0013-4686
J9 ELECTROCHIM ACTA
JI Electrochim. Acta
PD JAN 15
PY 2013
VL 88
BP 495
EP 506
DI 10.1016/j.electacta.2012.10.110
PG 12
WC Electrochemistry
SC Electrochemistry
GA 091UW
UT WOS:000315076300066
ER
PT J
AU Paul, R
Voevodin, AA
Hu, JJ
Amama, PB
Ganguli, S
Roy, AK
Zemlyanov, D
Fisher, TS
AF Paul, R.
Voevodin, A. A.
Hu, J. J.
Amama, P. B.
Ganguli, S.
Roy, A. K.
Zemlyanov, D.
Fisher, T. S.
TI Boron-carbon-nitrogen foam surfaces for thermal physisorption
applications
SO THIN SOLID FILMS
LA English
DT Article
DE Porous carbon; Boron nitrogen doping; Desorption; Enthalpy; Thermal
conductivity
ID X-RAY ELECTRON; ADSORPTION; CONDUCTIVITY; SPECTROSCOPY; BCN
AB A surface chemical treatment of highly porous carbon foams was adopted to synthesize boron-carbon-nitrogen (B-C-N) foams for thermal energy storage and release using an adsorption/desorption cycle with lightweight hydrocarbons. Microwave treatment in boric acid and urea was used to modify carbon foams with a B-C-N surface. Depending on the initial carbon foam state, B-C-N surface layers were produced with both amorphous and crystalline structures. The resultant B-C-N foams were characterized by TEM, XPS, XRD, FESEM and Raman measurements to quantify their stoichiometry, structure, and morphology. Adsorption enthalpy with methanol and thermal stability of foams was analyzed with DSC and TGA respectively. Thermal conductivity was measured by a transient laser flash technique. Results indicate that the crystalline graphitic carbon foam produces superior B-C-N surfaces compared to amorphous carbon foam. The crystalline B-C-N foams are found to provide the highest adsorption capacity, better thermal and oxidation stability. (c) 2012 Elsevier B.V. All rights reserved.
C1 [Paul, R.; Voevodin, A. A.; Zemlyanov, D.; Fisher, T. S.] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
[Voevodin, A. A.; Hu, J. J.; Amama, P. B.; Ganguli, S.; Roy, A. K.; Fisher, T. S.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Amama, P. B.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
RP Paul, R (reprint author), Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
EM paul24@purdue.edu; tsfisher@purdue.edu
RI Voevodin, Andrey/I-6684-2013; Fisher, Timothy/D-8517-2011
OI Fisher, Timothy/0000-0002-8909-313X
FU U.S. Air Force Research Laboratory (AFRL); Office of Scientific Research
(AFOSR) under the MURI program on Nanofabrication of Tunable 3D Nanotube
Architectures [FA9550-12-1-0037]
FX The authors are thankful to the U.S. Air Force Research Laboratory
(AFRL), and its Office of Scientific Research (AFOSR, FA9550-12-1-0037)
under the MURI program on Nanofabrication of Tunable 3D Nanotube
Architectures (PM: Dr. Joycelyn Harrison), for financial support of this
work. Thanks are due to Prof. Pipes and C. R. Misiego of Chemical
Engineering, Purdue University, for their help in the DSC and TGA study.
We are thankful to Purdue's Birck Nanotechnology Center staff for their
assistance and cooperation.
NR 37
TC 5
Z9 5
U1 4
U2 58
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0040-6090
J9 THIN SOLID FILMS
JI Thin Solid Films
PD JAN 15
PY 2013
VL 528
BP 187
EP 193
DI 10.1016/j.tsf.2012.08.059
PG 7
WC Materials Science, Multidisciplinary; Materials Science, Coatings &
Films; Physics, Applied; Physics, Condensed Matter
SC Materials Science; Physics
GA 078RB
UT WOS:000314115800032
ER
PT J
AU Kumar, A
Voevodin, AA
Paul, R
Altfeder, I
Zemlyanov, D
Zakharov, DN
Fisher, TS
AF Kumar, A.
Voevodin, A. A.
Paul, R.
Altfeder, I.
Zemlyanov, D.
Zakharov, D. N.
Fisher, T. S.
TI Nitrogen-doped graphene by microwave plasma chemical vapor deposition
SO THIN SOLID FILMS
LA English
DT Article
DE Graphene; Rapid synthesis; Nitrogen doping
ID FEW-LAYER GRAPHENE; CNX THIN-FILMS; CARBON; GROWTH; MOLECULES; GRAPHITE;
CELLS
AB Rapid synthesis of nitrogen-doped, few-layer graphene films on Cu foil is achieved by microwave plasma chemical vapor deposition. The films are doped during synthesis by introduction of nitrogen gas in the reactor. Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and scanning tunneling microscopy reveal crystal structure and chemical characteristics. Nitrogen concentrations up to 2 at.% are observed, and the limit is linked to the rigidity of graphene films on copper surfaces that impedes further nitrogen substitutions of carbon atoms. The entire growth process requires only a few minutes without supplemental substrate heating and offers a promising path toward large-scale synthesis of nitrogen-doped graphene films. (c) 2012 Elsevier B.V. All rights reserved.
C1 [Kumar, A.; Voevodin, A. A.; Paul, R.; Zemlyanov, D.; Zakharov, D. N.; Fisher, T. S.] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
[Voevodin, A. A.; Altfeder, I.; Fisher, T. S.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Fisher, TS (reprint author), Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
EM kumar50@purdue.edu; tsfisher@purdue.edu
RI Voevodin, Andrey/I-6684-2013; Zakharov, Dmitri/F-4493-2014; Fisher,
Timothy/D-8517-2011
OI Fisher, Timothy/0000-0002-8909-313X
FU U.S. Air Force Research Laboratory (AFRL); Office of Scientific Research
(AFOSR) under the MURI program on Nanofabrication of Tunable 3D Nanotube
Architectures [FA9550-12-1-0037]
FX The authors are thankful to the U.S. Air Force Research Laboratory
(AFRL), and its Office of Scientific Research (AFOSR, FA9550-12-1-0037)
under the MURI program on Nanofabrication of Tunable 3D Nanotube
Architectures (PM: Dr. Joycelyn Harrison), for financial support of this
work.
NR 41
TC 12
Z9 12
U1 3
U2 103
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0040-6090
J9 THIN SOLID FILMS
JI Thin Solid Films
PD JAN 15
PY 2013
VL 528
BP 269
EP 273
DI 10.1016/j.tsf.2012.07.142
PG 5
WC Materials Science, Multidisciplinary; Materials Science, Coatings &
Films; Physics, Applied; Physics, Condensed Matter
SC Materials Science; Physics
GA 078RB
UT WOS:000314115800045
ER
PT J
AU Hsu, PS
Jiang, NB
Gord, JR
Roy, S
AF Hsu, Paul S.
Jiang, Naibo
Gord, James R.
Roy, Sukesh
TI Fiber-coupled, 10 kHz simultaneous OH planar laser-induced
fluorescence/particle-image velocimetry
SO OPTICS LETTERS
LA English
DT Article
ID OPTICAL-FIBERS; SPECTROSCOPY; FLOWS
AB Planar laser-induced fluorescence (PLIF) and particle-image velocimetry (PIV) techniques that employ free-standing optics face severe challenges when implemented in harsh environments associated with practical combustion facilities because of limited optical access and restrictions on operation of sensitive laser systems. To circumvent this problem, we have developed and implemented a fiber-coupled, high-speed ultraviolet (UV) PLIF/PIV system for measuring hydroxyl radical (OH) concentration and velocity in a realistic 4 MW combustion rig. This system permits delivery of high-power, 10 kHz, nanosecond-duration OH-PLIF excitation pulses (283 nm) and PIV pulses (532 nm) through a common 6 m long, 600 mu m core, deep-UV-enhanced multimode fiber. Simultaneous OH-PLIF and PIV imaging at a data-acquisition rate of 10 kHz is demonstrated in turbulent premixed flames behind a bluff body. The effects of delivering high-repetition-rate, intense UV and visible beams through a long optical fiber are investigated, and potential system improvements are discussed. (C) 2013 Optical Society of America
C1 [Hsu, Paul S.; Jiang, Naibo; Roy, Sukesh] Spectral Energies LLC, Dayton, OH 45431 USA.
[Gord, James R.] USAF, Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
RP Roy, S (reprint author), Spectral Energies LLC, 5100 Springfield St,Suite 301, Dayton, OH 45431 USA.
EM sroy@woh.rr.com
FU AFOSR; AFRL [FA8650-12-C-2200]
FX Funding for this research was provided by the AFOSR (C. Li, Program
Manager) and by the AFRL under Contract No. FA8650-12-C-2200.
NR 13
TC 5
Z9 5
U1 0
U2 20
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 0146-9592
J9 OPT LETT
JI Opt. Lett.
PD JAN 15
PY 2013
VL 38
IS 2
BP 130
EP 132
PG 3
WC Optics
SC Optics
GA 071ZF
UT WOS:000313636600017
PM 23454938
ER
PT J
AU Kolsti, KF
Kunz, DL
AF Kolsti, Kyle F.
Kunz, Donald L.
TI A point collocation method for geometrically nonlinear membranes
SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
LA English
DT Article
DE Membrane; Nonlinear; Collocation; Validation
ID FINITE-ELEMENT-METHOD; PSEUDOTRANSIENT CONTINUATION; CONVERGENCE
AB This paper describes the development of a numerical model for geometrically nonlinear membranes and evaluates its performance for membranes at static equilibrium. The scheme has several features not commonly seen in structural finite element analysis: the point collocation method, group formulation, and a staggered mesh. In the point collocation finite element method, the partial differential equations are solved at each node instead of by integrating over elements. The group formulation simplifies the handling of nonlinearities by interpolating the nonlinear products of variables, as opposed to seeking the product of independently interpolated variables. The domain is discretized with a staggered mesh of linear triangles and associated polygons. Two sequential gradient recovery operations are performed: first the gradients of the linear triangles are calculated and converted to stresses; then, polygon derivative shape functions derived in this paper are used to determine the internal forces from the stress gradients. The resulting system of nonlinear equations is solved with a Jacobian-free Newton-Krylov solver. The code is first verified using the patch test and the method of manufactured solutions. Then the results are validated using experimental data and benchmark code results in the literature for the Hencky problem (a circular membrane with a fixed perimeter and uniform inflation pressure). The observed rates of convergence for both displacement and radial strain were two. For the configurations and grids used in this investigation, the scheme was suitable for accurately predicting sub-hyperelastic deformations. Published by Elsevier Ltd.
C1 [Kolsti, Kyle F.; Kunz, Donald L.] USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
RP Kolsti, KF (reprint author), USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
EM kyle.kolsti@wpafb.af.mil
FU Air Force Office of Scientific Research [F1ATA01103J001]
FX This research was funded by the Air Force Office of Scientific Research
Grant No. F1ATA01103J001.
NR 54
TC 1
Z9 1
U1 0
U2 7
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0020-7683
EI 1879-2146
J9 INT J SOLIDS STRUCT
JI Int. J. Solids Struct.
PD JAN 15
PY 2013
VL 50
IS 2
BP 288
EP 296
DI 10.1016/j.ijsolstr.2012.08.025
PG 9
WC Mechanics
SC Mechanics
GA 056WE
UT WOS:000312521300002
ER
PT J
AU Slipchenko, MN
Miller, JD
Roy, S
Gord, JR
Meyer, TR
AF Slipchenko, Mikhail N.
Miller, Joseph D.
Roy, Sukesh
Gord, James R.
Meyer, Terrence R.
TI All-diode-pumped quasi-continuous burst-mode laser for extended
high-speed planar imaging
SO OPTICS EXPRESS
LA English
DT Article
ID OPTICAL PARAMETRIC OSCILLATOR; NON-PREMIXED FLAMES; INDUCED
FLUORESCENCE; TURBULENT FLAMES; RAYLEIGH-SCATTERING; KHZ; SYSTEM; OH;
DIAGNOSTICS; GENERATION
AB An all-diode-pumped, multistage Nd:YAG amplifier is investigated as a means of extending the duration of high-power, burst-mode laser pulse sequences to an unprecedented 30 ms or more. The laser generates 120 mJ per pulse at 1064.3 nm with a repetition rate of 10 kHz, which is sufficient for a wide range of planar laser diagnostics based on fluorescence, Raman scattering, and Rayleigh scattering, among others. The utility of the technique is evaluated for image sequences of formaldehyde fluorescence in a lifted methane-air diffusion flame. The advantages and limitations of diode pumping are discussed, along with long-pulse diode-bar performance characteristics to guide future designs. (C) 2013 Optical Society of America
C1 [Slipchenko, Mikhail N.; Miller, Joseph D.; Roy, Sukesh] Spectral Energies LLC, Dayton, OH 45431 USA.
[Miller, Joseph D.; Meyer, Terrence R.] Iowa State Univ, Dept Mech Engn, Ames, IA 50011 USA.
[Gord, James R.] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Slipchenko, MN (reprint author), Spectral Energies LLC, Dayton, OH 45431 USA.
EM trm@iastate.edu
FU Air Force Office of Scientific Research; AFRL [FA8650-12-C-2200]
FX The authors are grateful to C. Dedic of Iowa State University for
technical assistance. This work was funded by the Air Force Office of
Scientific Research (Dr. Chiping Li, Program Manager) and the AFRL under
contract No. FA8650-12-C-2200.
NR 31
TC 12
Z9 12
U1 4
U2 20
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD JAN 14
PY 2013
VL 21
IS 1
BP 681
EP 689
DI 10.1364/OE.21.000681
PG 9
WC Optics
SC Optics
GA 104JF
UT WOS:000315988100092
PM 23388961
ER
PT J
AU Ma, L
Li, XS
Sanders, ST
Caswell, AW
Roy, S
Plemmons, DH
Gord, JR
AF Ma, Lin
Li, Xuesong
Sanders, Scott T.
Caswell, Andrew W.
Roy, Sukesh
Plemmons, David H.
Gord, James R.
TI 50-kHz-rate 2D imaging of temperature and H2O concentration at the
exhaust plane of a J85 engine using hyperspectral tomography
SO OPTICS EXPRESS
LA English
DT Article
ID LASER-ABSORPTION-SPECTROSCOPY; TURBULENT FLAMES; DIAGNOSTICS;
THERMOMETRY; COMBUSTION; SYSTEMS; ENERGY; KHZ
AB This paper describes a novel laser diagnostic and its demonstration in a practical aero-propulsion engine (General Electric J85). The diagnostic technique, named hyperspectral tomography (HT), enables simultaneous 2-dimensional (2D) imaging of temperature and water-vapor concentration at 225 spatial grid points with a temporal response up to 50 kHz. To our knowledge, this is the first time that such sensing capabilities have been reported. This paper introduces the principles of the HT techniques, reports its operation and application in a J85 engine, and discusses its perspective for the study of high-speed reactive flows. (C) 2013 Optical Society of America
C1 [Ma, Lin; Li, Xuesong] Virginia Tech, Dept Aerosp & Ocean Engn, Blacksburg, VA 24060 USA.
[Sanders, Scott T.] Univ Wisconsin, Dept Mech Engn, Madison, WI 53706 USA.
[Caswell, Andrew W.; Roy, Sukesh] Spectral Energies LLC, Dayton, OH 45431 USA.
[Plemmons, David H.] Aerosp Testing Alliance, Arnold AFB, TN 37839 USA.
[Gord, James R.] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Ma, L (reprint author), Virginia Tech, Dept Aerosp & Ocean Engn, Blacksburg, VA 24060 USA.
EM LinMa@vt.edu
RI Ma, Lin/A-9441-2012; Li, Xuesong/C-4844-2014; Li, Xuesong/I-5723-2016
OI Li, Xuesong/0000-0003-3835-8000;
FU Air Force Research Laboratory under Phase II SBIR [FA8650-09-C-2946];
Air Force Office of Scientific Research; Photonics Technology Access
Program (PTAP) program
FX Funding for this research was provided by the Air Force Research
Laboratory under Phase II SBIR Contract No. FA8650-09-C-2946. The
authors also acknowledge support from the Air Force Office of Scientific
Research (Dr. Chiping Li, Program Manager). Some components used in the
construction of the fiber Fabry-Perot tunable filter laser (FFP-TFL)
were provided by the NSF/DARPA-sponsored Photonics Technology Access
Program (PTAP) program, monitored by Marko Slusarczuk.
NR 30
TC 55
Z9 56
U1 4
U2 35
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD JAN 14
PY 2013
VL 21
IS 1
BP 1152
EP 1162
DI 10.1364/OE.21.001152
PG 11
WC Optics
SC Optics
GA 104JF
UT WOS:000315988100139
PM 23389008
ER
PT J
AU Abboud, JE
Chong, XY
Zhang, MJ
Zhang, ZL
Jiang, NB
Roy, S
Gord, JR
AF Abboud, Jacques E.
Chong, Xinyuan
Zhang, Mingjun
Zhang, Zhili
Jiang, Naibo
Roy, Sukesh
Gord, James R.
TI Photothermally activated motion and ignition using aluminum
nanoparticles
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID COMBUSTION; SPECTROSCOPY; NANOTUBES; SOLAR; CELLS; SIZE
AB The aluminum nanoparticles (Al NPs) are demonstrated to serve as active photothermal media, to enhance and control local photothermal energy deposition via the photothermal effect activated by localized surface plasmon resonance (LSPR) and amplified by Al NPs oxidation. The activation source is a 2-AA-battery-powered xenon flash lamp. The extent of the photothermally activated movement of Al NPs can be similar to 6 mm. Ignition delay can be similar to 0.1 ms. Both scanning electron microscopy and energy-dispersive X-ray spectroscopy measurements of motion-only and afterignition products confirm significant Al oxidation occurs through sintering and bursting after the flash exposure. Simulations suggest local heat generation is enhanced by LSPR. The positive-feedback effects from the local heat generation amplified by Al oxidation produce a large increase in local temperature and pressure, which enhances movement and accelerates ignition. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4776660]
C1 [Abboud, Jacques E.; Chong, Xinyuan; Zhang, Mingjun; Zhang, Zhili] Univ Tennessee, Mech Aerosp & Biomed Engn Dept, Knoxville, TN 37996 USA.
[Jiang, Naibo; Roy, Sukesh] Spectral Energies LLC, Dayton, OH 45431 USA.
[Gord, James R.] USAF, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Abboud, JE (reprint author), Univ Tennessee, Mech Aerosp & Biomed Engn Dept, Knoxville, TN 37996 USA.
EM zzhang24@utk.edu
RI Zhang, Zhili/F-1305-2010
OI Zhang, Zhili/0000-0002-0831-0471
FU NSF [CBET-1032523]; ARO [W911NF-10-10114]; Air Force Research Laboratory
[FA8650-10-C- 2008]
FX We acknowledge the encouragement and support from AFOSR program manager
Dr. Chiping Li for this work. The work at the University of Tennessee
Knoxville was supported by NSF CBET-1032523 and ARO W911NF-10-10114.
Funding for Spectral Energies is provided by the Air Force Research
Laboratory under Contract No. FA8650-10-C- 2008.
NR 37
TC 7
Z9 7
U1 2
U2 60
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD JAN 14
PY 2013
VL 102
IS 2
AR 023905
DI 10.1063/1.4776660
PG 5
WC Physics, Applied
SC Physics
GA 072KQ
UT WOS:000313670200114
ER
PT J
AU Lewis, WK
Rumchik, CG
Smith, MJ
AF Lewis, W. K.
Rumchik, C. G.
Smith, M. J.
TI Emission spectroscopy of the interior of optically dense post-detonation
fireballs
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID BOMB DETONATIONS; ALUMINUM; CHEMILUMINESCENCE; COMBUSTION; TRANSITION;
FLAME
AB In recent years, emission spectroscopy has been applied to the study of post-detonation combustion in explosives, often yielding valuable information on temperatures and chemical dynamics. The post-detonation fireballs that form as under-oxidized detonation products burn in the surrounding air are optically dense and the corresponding emission spectra sample only the material at or near the surface of the fireball. In the present study, we exploit the large optical density in order to probe the dynamics occurring in the interior of the fireball. Emission spectra are collected following detonation of 20 g aluminized Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) charges using fiber optics located behind the flame front and then compared with the corresponding spectra of the surface layer collected from outside the fireball. We find that in the early evolution of the fireball (t <= 60 mu s and r <= 10 cm in the current study), combustion and light emission are predominantly confined to the surface, while the interior is dark. Later, after the fireball expands and mixes with the surrounding air (t >= 120 mu s or r >= 30 cm), combustion and emission occur throughout, and we find no significant differences between the spectra collected from the interior of the fireball versus those from its surface. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4774029]
C1 [Lewis, W. K.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Rumchik, C. G.] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
[Smith, M. J.] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Lewis, WK (reprint author), Univ Dayton, Res Inst, Dayton, OH 45469 USA.
EM wlewis2@udayton.edu
FU Air Force Research Laboratory
FX The authors gratefully acknowledge funding and facilities provided for
this work by the Air Force Research Laboratory under the NanoEnergetics
Program. We would like to thank Mr. Rick Beesley and Mr. Mark Grimmonpre
for their assistance in conducting these experiments.
NR 28
TC 5
Z9 5
U1 0
U2 14
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD JAN 14
PY 2013
VL 113
IS 2
AR 024903
DI 10.1063/1.4774029
PG 4
WC Physics, Applied
SC Physics
GA 072BY
UT WOS:000313644500105
ER
PT J
AU Roy, S
Hsu, PS
Jiang, NB
Gord, JR
Kulatilaka, WD
Stauffer, HU
Gord, JR
AF Roy, Sukesh
Hsu, Paul S.
Jiang, Naibo
Gord, Joseph R.
Kulatilaka, Waruna D.
Stauffer, Hans U.
Gord, James R.
TI Direct measurements of collisionally broadened Raman linewidths of CO2
S-branch transitions
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
ID DIODE-LASER MEASUREMENTS; ROTATIONAL RAMAN; TEMPERATURE-RANGE; IR LINES;
HIGH-RESOLUTION; CARBON-DIOXIDE; SPECTROSCOPY; BAND; SCATTERING; WIDTHS
AB We report direct measurements of S-branch Raman-coherence lifetimes of CO2 resulting from CO2-CO2 and CO2-N-2 collisions by employing time-resolved picosecond coherent anti-Stokes Raman scattering spectroscopy. The S-branch (Delta J = +2) transitions of CO2 with rotational quantum number J = 0-52 were simultaneously excited using a broadband (similar to 5 nm) laser pulse with a full-width-at-half-maximum duration of similar to 115 ps. The coherence lifetimes of CO2 for a pressure range of 0.05-1 atm were measured directly by probing the rotational coherence with a nearly transform-limited, 90-ps-long laser pulse. These directly measured Raman-coherence lifetimes, when converted to collisional linewidth broadening coefficients, differ from the previously reported broadening coefficients extracted from frequency-domain rotational Raman and infrared-absorption spectra and from theoretical calculations by 7%-25%. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4774093]
C1 [Roy, Sukesh; Hsu, Paul S.; Jiang, Naibo; Kulatilaka, Waruna D.; Stauffer, Hans U.] Spectral Energies LLC, Dayton, OH 45431 USA.
[Gord, Joseph R.] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA.
[Gord, James R.] USAF, Res Lab, Aerosp Syst Directorate, Wright Patterson AFB, OH 45433 USA.
RP Roy, S (reprint author), Spectral Energies LLC, 5100 Springfield St,Suite 301, Dayton, OH 45431 USA.
EM sroy@woh.rr.com
FU Air Force Research Laboratory [FA8650-12-C-2200]; (U.S.) Air Force
Office of Scientific Research (US-AFOSR)
FX Funding for this research was provided by the Air Force Research
Laboratory under Contract No. FA8650-12-C-2200 and by the (U.S.) Air
Force Office of Scientific Research (US-AFOSR) (Dr. Enrique Parra,
Program Manager).
NR 43
TC 10
Z9 10
U1 0
U2 21
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD JAN 14
PY 2013
VL 138
IS 2
AR 024201
DI 10.1063/1.4774093
PG 6
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 072BF
UT WOS:000313642500020
PM 23320675
ER
PT J
AU Behabtu, N
Young, CC
Tsentalovich, DE
Kleinerman, O
Wang, X
Ma, AWK
Bengio, EA
ter Waarbeek, RF
de Jong, JJ
Hoogerwerf, RE
Fairchild, SB
Ferguson, JB
Maruyama, B
Kono, J
Talmon, Y
Cohen, Y
Otto, MJ
Pasquali, M
AF Behabtu, Natnael
Young, Colin C.
Tsentalovich, Dmitri E.
Kleinerman, Olga
Wang, Xuan
Ma, Anson W. K.
Bengio, E. Amram
ter Waarbeek, Ron F.
de Jong, Jorrit J.
Hoogerwerf, Ron E.
Fairchild, Steven B.
Ferguson, John B.
Maruyama, Benji
Kono, Junichiro
Talmon, Yeshayahu
Cohen, Yachin
Otto, Marcin J.
Pasquali, Matteo
TI Strong, Light, Multifunctional Fibers of Carbon Nanotubes with Ultrahigh
Conductivity
SO SCIENCE
LA English
DT Article
ID THERMAL TRANSPORT; ELECTRICAL-CONDUCTIVITY; CRYSTALLINE ROPES;
FIELD-EMISSION; YARNS; PERFORMANCE; FILMS; NEAT
AB Broader applications of carbon nanotubes to real-world problems have largely gone unfulfilled because of difficult material synthesis and laborious processing. We report high-performance multifunctional carbon nanotube (CNT) fibers that combine the specific strength, stiffness, and thermal conductivity of carbon fibers with the specific electrical conductivity of metals. These fibers consist of bulk-grown CNTs and are produced by high-throughput wet spinning, the same process used to produce high-performance industrial fibers. These scalable CNT fibers are positioned for high-value applications, such as aerospace electronics and field emission, and can evolve into engineered materials with broad long-term impact, from consumer electronics to long-range power transmission.
C1 [Behabtu, Natnael; Young, Colin C.; Tsentalovich, Dmitri E.; Wang, Xuan; Ma, Anson W. K.; Bengio, E. Amram; Kono, Junichiro; Pasquali, Matteo] Rice Univ, Smalley Inst Nanoscale Sci & Technol, Dept Chem & Biomol Engn,Dept Phys & Astron, Dept Chem,Dept Elect & Comp Engn,Appl Phys Progra, Houston, TX 77005 USA.
[Kleinerman, Olga; Bengio, E. Amram; Talmon, Yeshayahu; Cohen, Yachin] Technion Israel Inst Technol, Dept Chem Engn, IL-32000 Haifa, Israel.
[Kleinerman, Olga; Bengio, E. Amram; Talmon, Yeshayahu; Cohen, Yachin] Russell Berrie Nanotechnol Inst RBNI, IL-32000 Haifa, Israel.
[ter Waarbeek, Ron F.; de Jong, Jorrit J.; Hoogerwerf, Ron E.; Otto, Marcin J.] Teijin Aramid, Arnhem, Netherlands.
[Fairchild, Steven B.; Ferguson, John B.; Maruyama, Benji] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Pasquali, M (reprint author), Rice Univ, Smalley Inst Nanoscale Sci & Technol, Dept Chem & Biomol Engn,Dept Phys & Astron, Dept Chem,Dept Elect & Comp Engn,Appl Phys Progra, Houston, TX 77005 USA.
EM mp@rice.edu
RI Pasquali, Matteo/A-2489-2008; Ma, Anson/A-6005-2011
OI Pasquali, Matteo/0000-0001-5951-395X; Ma, Anson/0000-0002-2865-5776
FU Teijin Aramid BV; Teijin Techno Products Ltd.; Air Force Office of
Scientific Research [FA9550-09-1-0590]; Russell Berrie Nanotechnology
Institute; Air Force Research Laboratory [FA8650-07-2-5061]; U.S.
Department of Defense National Defense Science and Engineering Graduate
fellowship; Welch Foundation [C-1668]
FX We thank F. Mirri for the CNT film; T. Back, D. Ramsamoedj, E. Klop, E.
Steyn, T. Cohen-Hymas, P. M. Ajayan, B. Carey, F. Matteini, A. Mizes, V.
Parolkar, A. Choi, and S. Odumabo for help with fiber characterization;
and K. McElrath, E. Vega, X. Hu, W. Adams, R. Hauge, and E. Thomas for
useful discussions. This work was supported by Teijin Aramid BV, Teijin
Techno Products Ltd., Air Force Office of Scientific Research
FA9550-09-1-0590, Russell Berrie Nanotechnology Institute, Air Force
Research Laboratory FA8650-07-2-5061, the U.S. Department of Defense
National Defense Science and Engineering Graduate fellowship, and the
Welch Foundation (C-1668 and Evans Attwell fellowship). European
provisional patent application EP12177741 was filed 25 July 2012.
NR 39
TC 284
Z9 294
U1 73
U2 735
PU AMER ASSOC ADVANCEMENT SCIENCE
PI WASHINGTON
PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA
SN 0036-8075
EI 1095-9203
J9 SCIENCE
JI Science
PD JAN 11
PY 2013
VL 339
IS 6116
BP 182
EP 186
DI 10.1126/science.1228061
PG 5
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 067XI
UT WOS:000313328200038
PM 23307737
ER
PT J
AU Wang, J
Lee, YJ
Chadha, AS
Yi, J
Jespersen, ML
Kelley, JJ
Nguyen, HM
Nimmo, M
Malko, AV
Vaia, RA
Zhou, WD
Hsu, JWP
AF Wang, Jian
Lee, Yun-Ju
Chadha, Arvinder S.
Yi, Juan
Jespersen, Michael L.
Kelley, John J.
Nguyen, Hue M.
Nimmo, Michael
Malko, Anton V.
Vaia, Richard A.
Zhou, Weidong
Hsu, Julia W. P.
TI Effect of Plasmonic Au Nanoparticles on Inverted Organic Solar Cell
Performance
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID PHOTOVOLTAIC DEVICES; SILVER NANOPARTICLES; ENHANCEMENT; DISTANCE;
SURFACE
AB We studied the competition between energy loss due to quenching and enhanced absorption arising from the near-field plasmonic effect of Au nanoparticles (NPs) on the performance of organic solar cells (OSCs), by fabricating inverted architecture OSCs with electron transport layers consisting of an Au NPs monolayer covered by a ZnO overlayer. The distance between Au NPs and a poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) active layer was controlled by systematically varying the ZnO overlayer thickness, and its effect on the absorption spectra, photoluminescence (PL) dynamics, and OSC performance of these films is examined. We found that when P3HT:PCBM is in direct contact with the Au NPs, PL intensity was reduced and the OSC device was shunted with lower values in photocurrent, open circuit voltage, and fill factor. With a thin (8 nm) ZnO overlayer, higher absorption and PL signal were observed, and some OSC device parameters improved, but the short circuit current density remained low. ZnO overlayer thickness greater than 30 nm negated any impact of the AuNPs on the absorption of the active layer. A small (similar to 5%) efficiency enhancement was achieved in the 16 nm ZnO overlayer devices; however, this improvement resulted from increased fill factor rather than photocurrent. Optical field simulation using the finite-difference time-domain (FDTD) method showed that redistribution of the optical field by Au NPs resulted in a 0.6% absorption reduction over the entire P3HT:PCBM active layer.
C1 [Wang, Jian; Lee, Yun-Ju; Hsu, Julia W. P.] Univ Texas Dallas, Dept Mat Sci & Engn, Richardson, TX 75080 USA.
[Chadha, Arvinder S.; Zhou, Weidong] Univ Texas Arlington, Dept Elect Engn, Arlington, TX 76019 USA.
[Yi, Juan; Nguyen, Hue M.; Nimmo, Michael; Malko, Anton V.] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA.
[Jespersen, Michael L.; Kelley, John J.; Vaia, Richard A.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Hsu, JWP (reprint author), Univ Texas Dallas, Dept Mat Sci & Engn, Richardson, TX 75080 USA.
EM jwhsu@utdallas.edu
RI Wang, Jian/G-7488-2011
OI Wang, Jian/0000-0002-4515-9782
FU Consortium for Nanomaterials for Aerospace Commerce and Technology
(CONTACT); University of Texas at Dallas; Air Force Research Laboratory;
Texas Instruments Distinguished Chair in Nanoelectronics
FX This project was supported by Consortium for Nanomaterials for Aerospace
Commerce and Technology (CONTACT), University of Texas at Dallas, and
Air Force Research Laboratory. J.W.P.H. acknowledges the support from
Texas Instruments Distinguished Chair in Nanoelectronics.
NR 35
TC 28
Z9 28
U1 1
U2 126
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD JAN 10
PY 2013
VL 117
IS 1
BP 85
EP 91
DI 10.1021/jp309415u
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 066KW
UT WOS:000313220700012
ER
PT J
AU Altfeder, I
Yi, W
Narayanamurti, V
AF Altfeder, Igor
Yi, Wei
Narayanamurti, V.
TI Spin-polarized scanning tunneling microscopy of the room-temperature
antiferromagnet c-FeSi
SO PHYSICAL REVIEW B
LA English
DT Article
ID BAND-STRUCTURE; IRON SILICIDE; SI(111); SUPERLATTICES; SPECTROSCOPY;
LAYERS; FILMS
AB Antiferromagnetic spin ordering has been revealed by room-temperature spin-polarized scanning tunneling microscopy (SP-STM) in thin epitaxial films of c-FeSi on Si(111). Spin polarization of tunneling current for unoccupied states is found to be unusually large I-up arrow up arrow/I-down arrow up arrow = 3.8. Atomically sharp spin-frustration domain walls, developing on the surfaces of nanoscale islands, have been observed on SP-STM images. Our results suggest that antiferromagnetism in c-FeSi is driven by Mott-Hubbard transition, and the atomically narrow domain walls are caused by local insulator-to-metal breakdown.
C1 [Altfeder, Igor] USAF, Nanoelect Mat Branch, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Yi, Wei] Hewlett Packard Labs, Palo Alto, CA 94304 USA.
[Yi, Wei; Narayanamurti, V.] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA.
RP Altfeder, I (reprint author), USAF, Nanoelect Mat Branch, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM igor.altfeder.ctr@wpafb.af.mil
RI Yi, Wei/C-1186-2008
OI Yi, Wei/0000-0002-4841-3600
FU AFOSR MURI; Harvard NSF NSEC
FX We thank P. Nikolaev, N. Zhitenev, O. Pietzsch, I. Appelbaum, S. Patton,
A. Bratkovski, D. M. Chen, and A. A. Voevodin for interesting
discussions. The research was supported by AFOSR MURI and Harvard NSF
NSEC.
NR 33
TC 2
Z9 2
U1 3
U2 43
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD JAN 10
PY 2013
VL 87
IS 2
AR 020403
DI 10.1103/PhysRevB.87.020403
PG 4
WC Physics, Condensed Matter
SC Physics
GA 069GO
UT WOS:000313423500001
ER
PT J
AU Munoz, JA
Lucas, MS
Mauger, L
Halevy, I
Horwath, J
Semiatin, SL
Xiao, YM
Chow, P
Stone, MB
Abernathy, DL
Fultz, B
AF Munoz, J. A.
Lucas, M. S.
Mauger, L.
Halevy, I.
Horwath, J.
Semiatin, S. L.
Xiao, Yuming
Chow, Paul
Stone, M. B.
Abernathy, D. L.
Fultz, B.
TI Electronic structure and vibrational entropies of fcc Au-Fe alloys
SO PHYSICAL REVIEW B
LA English
DT Article
ID NUCLEAR RESONANT SCATTERING; TOTAL-ENERGY CALCULATIONS; FORCE-CONSTANT
CHANGES; DENSITY-OF-STATES; GOLD-IRON ALLOYS; X-RAY-SCATTERING; WAVE
BASIS-SET; LATTICE-DYNAMICS; NANOPARTICLES; METALS
AB Phonon density of states (DOS) curves were measured on alloys of face-centered-cubic (fcc) Au-Fe using nuclear resonant inelastic x-ray scattering (NRIXS) and inelastic neutron scattering (INS). The NRIXS and INS results were combined to obtain the total phonon DOS and the partial phonon DOS curves of Au and Fe atoms from which vibrational entropies were calculated. The main effect on the vibrational entropy of alloying comes from a stiffening of the Au partial phonon DOS with Fe concentration. Force constants were calculated from first principles for several compositions and show a local stiffening of Au-Au bonds close to Fe atoms. The calculated phonon DOS curves reproduce the experimental trend. The stiffening is attributed to two main effects comparable in magnitude: (i) an increase in electron density in the free-electron-like states and (ii) stronger sd hybridization. DOI: 10.1103/PhysRevB.87.014301
C1 [Munoz, J. A.; Mauger, L.; Halevy, I.; Fultz, B.] CALTECH, WM Keck Lab 138 78, Pasadena, CA 91125 USA.
[Lucas, M. S.; Horwath, J.; Semiatin, S. L.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Lucas, M. S.] UTC Inc, Dayton, OH 45432 USA.
[Xiao, Yuming; Chow, Paul] Carnegie Inst Sci, Geophys Lab, HPCAT, Argonne, IL 60439 USA.
[Stone, M. B.; Abernathy, D. L.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Munoz, JA (reprint author), CALTECH, WM Keck Lab 138 78, Pasadena, CA 91125 USA.
RI Stone, Matthew/G-3275-2011; Munoz, Jorge/C-8427-2011; Abernathy,
Douglas/A-3038-2012; BL18, ARCS/A-3000-2012; SEMIATIN,
SHELDON/E-7264-2017
OI Stone, Matthew/0000-0001-7884-9715; Abernathy,
Douglas/0000-0002-3533-003X;
FU CIW; CDAC; UNLV; LLNL; DOE-NNSA; DOE-BES; NSF; DOE-BES
[DE-AC02-06CH11357]; Scientific User Facilities Division, Office of
Basic Energy Sciences, US Department of Energy; NSF [DMR-0520547]; DOE
BES [DE-FG02-03ER46055]
FX Portions of this work were performed at HPCAT (Sector 16), Advanced
Photon Source (APS), Argonne National Laboratory. HPCAT is supported by
CIW, CDAC, UNLV, and LLNL through funding from DOE-NNSA, DOE-BES, and
NSF. Use of the APS was supported by DOE-BES, under Contract No.
DE-AC02-06CH11357. A portion of this research at Oak Ridge National
Laboratory's Spallation Neutron Source was sponsored by the Scientific
User Facilities Division, Office of Basic Energy Sciences, US Department
of Energy. This work benefited from DANSE software developed under NSF
Grant No. DMR-0520547. This work was supported by DOE BES under contract
DE-FG02-03ER46055.
NR 64
TC 11
Z9 11
U1 3
U2 54
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD JAN 10
PY 2013
VL 87
IS 1
AR 014301
DI 10.1103/PhysRevB.87.014301
PG 7
WC Physics, Condensed Matter
SC Physics
GA 069GJ
UT WOS:000313423000003
ER
PT J
AU Koerner, H
Strong, RJ
Smith, ML
Wang, DH
Tan, LS
Lee, KM
White, TJ
Vaia, RA
AF Koerner, Hilmar
Strong, Robert J.
Smith, Matthew L.
Wang, David H.
Tan, Loon-Seng
Lee, Kyung Min
White, Timothy J.
Vaia, Richard A.
TI Polymer design for high temperature shape memory: Low crosslink density
polyimides
SO POLYMER
LA English
DT Article
DE Shape memory; Polyimide; Nanocomposite
ID THERMOMECHANICAL BEHAVIOR; GLASS-TRANSITION; POLYURETHANE SERIES;
CONSTITUTIVE THEORY; NETWORKS; NANOCOMPOSITES; MODEL; COMPOSITES;
DEFORMATIONS; ELASTOMERS
AB Shape memory in polymers is a process whereby mechanical energy is microscopically stored, and reversibly recovered within the polymer. Consideration of the viscoelastic and glassy dynamics necessary for each step of the process reveals key molecular characteristics that may improve performance, including a rigid polymer backbone with narrow molecular weight distribution between a low fraction of crosslinks. With this insight to guide high temperature polymer design, aromatic CP2 polyimide and associated single wall carbon nanotube (SWNTs) nanocomposites are shown to have excellent shape memory performance at 220 degrees C with rapid recovery (<10 s), excellent fixity (>98%), good cyclability and outstanding creep resistance. A narrow glass transition temperature regime (<10 degrees C) and high fragility (m similar to 117) affords a narrow triggering window and the ability to spatially localize recovery with a temperature gradient. The addition of up to 3 vol% of dispersed SWNTs improves the rubbery modulus and blocking force without substantially impacting these crucial characteristics. The structure-performance relationships in this material system reinforce the key molecular characteristics for the design of polymers for shape memory. Published by Elsevier Ltd.
C1 [Koerner, Hilmar; Strong, Robert J.; Smith, Matthew L.; Wang, David H.; Tan, Loon-Seng; Lee, Kyung Min; White, Timothy J.; Vaia, Richard A.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Vaia, RA (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM richard.vaia@wpafb.af.mil
RI White, Timothy/D-4392-2012; Tan, Loon-Seng/F-6985-2012
OI Tan, Loon-Seng/0000-0002-2134-9290
FU Air Force Office for Scientific Research; National Research Council
FX We thank Tao Xie (GM) for helpful discussions. We thank Marlene Houtz
for additional DMA and TGA measurements. Funding for this project was
available from the Air Force Office for Scientific Research. M.L.S.
contributed to this article while holding a National Research Council
Research Associateship Award.
NR 95
TC 29
Z9 29
U1 12
U2 102
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0032-3861
EI 1873-2291
J9 POLYMER
JI Polymer
PD JAN 8
PY 2013
VL 54
IS 1
BP 391
EP 402
DI 10.1016/j.polymer.2012.11.007
PG 12
WC Polymer Science
SC Polymer Science
GA 190QT
UT WOS:000322356000045
ER
PT J
AU Kim, JO
Sengupta, S
Barve, AV
Sharma, YD
Adhikary, S
Lee, SJ
Noh, SK
Allen, MS
Allen, JW
Chakrabarti, S
Krishna, S
AF Kim, J. O.
Sengupta, S.
Barve, A. V.
Sharma, Y. D.
Adhikary, S.
Lee, S. J.
Noh, S. K.
Allen, M. S.
Allen, J. W.
Chakrabarti, S.
Krishna, S.
TI Multi-stack InAs/InGaAs sub-monolayer quantum dots infrared
photodetectors
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID EPITAXY
AB We report on the design and performance of multi-stack InAs/InGaAs sub-monolayer (SML) quantum dots (QD) based infrared photodetectors (SML-QDIP). SML-QDIPs are grown with the number of stacks varied from 2 to 6. From detailed radiometric characterization, it is determined that the sample with 4 SML stacks has the best performance. The s-to-p (s/p) polarized spectral response ratio of this device is measured to be 21.7%, which is significantly higher than conventional Stranski-Krastanov quantum dots (similar to 13%) and quantum wells (similar to 2.8%). This result makes the SML-QDIP an attractive candidate in applications that require normal incidence. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4774383]
C1 [Kim, J. O.; Barve, A. V.; Sharma, Y. D.; Krishna, S.] Univ New Mexico, Ctr High Technol Mat, Dept Elect & Comp Engn, Albuquerque, NM 87106 USA.
[Sengupta, S.; Adhikary, S.; Chakrabarti, S.] Indian Inst Technol, Dept Elect Engn, Ctr Nanoelect, Bombay 400076, Maharashtra, India.
[Lee, S. J.; Noh, S. K.] Korean Res Inst Stand & Sci, Taejon 305340, South Korea.
[Allen, M. S.; Allen, J. W.] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Noh, SK (reprint author), Korean Res Inst Stand & Sci, Taejon 305340, South Korea.
EM sknoh@kriss.re.kr; skrishna@chtm.unm.edu
FU KRISS-UNM Global Research Laboratory program of the National Research
Foundation (NRF) of Korea [2007-00011]; AFRL [FA8718-09-C-0038];
Department of Science and Technology, India
FX This work was supported by KRISS-UNM Global Research Laboratory program
(No. 2007-00011) of the National Research Foundation (NRF) of Korea and
AFRL FA8718-09-C-0038. Partial funding from Department of Science and
Technology, India is acknowledged. We are grateful to Jannell Vander
Grift for proof-reading the manuscript.
NR 22
TC 29
Z9 29
U1 0
U2 42
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0003-6951
EI 1077-3118
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD JAN 7
PY 2013
VL 102
IS 1
AR 011131
DI 10.1063/1.4774383
PG 4
WC Physics, Applied
SC Physics
GA 072CQ
UT WOS:000313646500031
ER
PT J
AU Szmulowicz, F
Brown, GJ
AF Szmulowicz, F.
Brown, G. J.
TI Calculation of interface roughness scattering-limited vertical and
horizontal mobilities in InAs/GaSb superlattices as a function of
temperature
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID 2-DIMENSIONAL ELECTRON-GAS; HGTE-CDTE SUPERLATTICES; SEMICONDUCTOR
SUPERLATTICES; GAAS/GAALAS SUPERLATTICE; PHOTODIODES; WAVELENGTH;
TRANSPORT; MAGNETOTRANSPORT; POLARIZABILITY; PASSIVATION
AB Superlattice transport has acquired new relevance owing to the current interest in InAs/GaSb and other superlattices (SL) for third-generation infrared detector focal plane arrays. Interface-roughness scattering (IRS) is known to limit carrier mobilities at low temperatures. Whereas horizontal (in-plane) transport measurements are standard, perpendicular transport measurements (across SL layers)-the ones relevant to the operation of infrared sensors-are non-routine and seldom performed; vertical SL transport is also less well studied theoretically. Therefore, we extend our previous work on low-temperature SL transport by studying horizontal and vertical IRS-limited transport in InAs/GaSb SLs as a function of temperature, SL parameters, and the degree of roughness. Electron mobilities are calculated by solving the Boltzmann equation with temperature-dependent bands and carrier screening, and the results are discussed by analyzing the behavior of the relaxation rates and spectral mobilities, defined as mobilities as a function of carrier energy. New computational tools are devised to handle the implicit integral equation for the horizontal relaxation rates. We find that the behavior of the relaxation rates and spectral mobilities undergoes a change for energies below and above the conduction band bandwidth, which dictates the ultimate behavior of mobilities as a function of temperature. The calculated mobilities are found to display a rich variety of behaviors as a function of temperature, either increasing, decreasing, or remaining relatively constant, depending on the correlation length of interface roughness, K, and the conduction band bandwidth. Since the horizontal mobility is a double-valued function of K, the temperature dependence of mobilities can be used to eliminate this indeterminacy in order to assess the degree of interface roughness. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772724]
C1 [Szmulowicz, F.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Brown, G. J.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Szmulowicz, F (reprint author), Univ Dayton, Res Inst, 300 Coll Pk Ave, Dayton, OH 45469 USA.
EM Frank.Szmulowicz.ctr@wpafb.af.mil
FU Materials & Manufacturing Directorate, AFRL/RXPS [FA8650-11-D-5401]
FX The work of FS was supported by the AF Contract No. FA8650-11-D-5401 at
the Materials & Manufacturing Directorate, AFRL/RXPS. We would like to
thank Dr. S. Elhamri for the Hall measurements in Table I and Dr. H.
Haugan for growing the samples.
NR 41
TC 5
Z9 5
U1 2
U2 33
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD JAN 7
PY 2013
VL 113
IS 1
AR 014302
DI 10.1063/1.4772724
PG 14
WC Physics, Applied
SC Physics
GA 067XQ
UT WOS:000313329000067
ER
PT J
AU Kreit, E
Mathger, LM
Hanlon, RT
Dennis, PB
Naik, RR
Forsythe, E
Heikenfeld, J
AF Kreit, Eric
Maethger, Lydia M.
Hanlon, Roger T.
Dennis, Patrick B.
Naik, Rajesh R.
Forsythe, Eric
Heikenfeld, Jason
TI Biological versus electronic adaptive coloration: how can one inform the
other?
SO JOURNAL OF THE ROYAL SOCIETY INTERFACE
LA English
DT Review
DE adaptive coloration; reflective coloration; cephalopod; reflective
displays
ID AVIAN FEATHER BARBS; SQUID IRIDOPHORES; RECEPTOR NOISE; DISPLAYS;
CAMOUFLAGE; CHROMATOPHORES; REFLECTANCE; MODEL; NANOSTRUCTURES;
CEPHALOPODS
AB Adaptive reflective surfaces have been a challenge for both electronic paper (e-paper) and biological organisms. Multiple colours, contrast, polarization, reflectance, diffusivity and texture must all be controlled simultaneously without optical losses in order to fully replicate the appearance of natural surfaces and vividly communicate information. This review merges the frontiers of knowledge for both biological adaptive coloration, with a focus on cephalopods, and synthetic reflective e-paper within a consistent framework of scientific metrics. Currently, the highest performance approach for both nature and technology uses colourant transposition. Three outcomes are envisioned from this review: reflective display engineers may gain new insights from millions of years of natural selection and evolution; biologists will benefit from understanding the types of mechanisms, characterization and metrics used in synthetic reflective e-paper; all scientists will gain a clearer picture of the long-term prospects for capabilities such as adaptive concealment and signalling.
C1 [Kreit, Eric; Heikenfeld, Jason] Univ Cincinnati, Sch Elect & Comp Syst, Novel Devices Lab, Cincinnati, OH 45221 USA.
[Maethger, Lydia M.; Hanlon, Roger T.] Marine Biol Lab, Woods Hole, MA 02543 USA.
[Dennis, Patrick B.; Naik, Rajesh R.] USAF, Mat & Mfg Directorate, Res Lab, Dayton, OH 45433 USA.
[Forsythe, Eric] USA, Sensors & Electron Devices Directorate, Res Lab, Adelphi, MD 20783 USA.
RP Heikenfeld, J (reprint author), Univ Cincinnati, Sch Elect & Comp Syst, Novel Devices Lab, Cincinnati, OH 45221 USA.
EM heikenjc@ucmail.uc.edu
RI Hanlon, Roger/Q-8687-2016
OI Hanlon, Roger/0000-0003-0004-5674
FU AFRL [5408-25-SC-0003]; NSF [0640964]; NSF IHCS [1001141]; ARL
[W9111NF-09-2-0034, W911NF-09-2-0043]; AFOSR [FA9550-09-0346]; DARPA
(DSO) [W911NF-10-1-0113]; ONR [N00014-10-1-0989]
FX E.K., J.H. and E. F. created content on technological (synthetic)
aspects of adaptive coloration while L. M. M., R. T. H., P. B. D. and
R.R.N. focused on the biological content. E. K. organized and compiled
the sections into the main paper, and worked with J.H. on the
comparisons section at the end. All authors discussed the information
presented in the paper at all stages, with the exception of E. F. who
made significant contributions at later stages. The University of
Cincinnati authors gratefully acknowledge partial support from AFRL
(contract no. 5408-25-SC-0003) NSF Career award (no. 0640964; University
of Cincinnati), NSF IHCS award (no. 1001141) and ARL (grant no.
W9111NF-09-2-0034). MBL authors acknowledge support from AFOSR grant no.
FA9550-09-0346, ARL grant no. W911NF-09-2-0043, DARPA (DSO) grant no.
W911NF-10-1-0113 and ONR grant no. N00014-10-1-0989. R.R.N. acknowledges
support from AFOSR.
NR 74
TC 18
Z9 18
U1 4
U2 83
PU ROYAL SOC
PI LONDON
PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND
SN 1742-5689
EI 1742-5662
J9 J R SOC INTERFACE
JI J. R. Soc. Interface
PD JAN 6
PY 2013
VL 10
IS 78
AR 20120601
DI 10.1098/rsif.2012.0601
PG 13
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 048UT
UT WOS:000311939400013
PM 23015522
ER
PT J
AU Cook, JL
AF Cook, James L.
BE Decker, KS
TI Ender's Beginning and the Just War
SO ENDER'S GAME AND PHILOSOPHY: THE LOGIC GATE IS DOWN
SE Blackwell Philosophy and Pop Culture Series
LA English
DT Article; Book Chapter
C1 [Cook, James L.] US Air Force Acad, Dept Philosophy, Colorado Springs, CO 80840 USA.
[Cook, James L.] NATO, Brussels, Belgium.
[Cook, James L.] Natl Mil Acad Afghanistan, Kabul, Afghanistan.
RP Cook, JL (reprint author), US Air Force Acad, Dept Philosophy, Colorado Springs, CO 80840 USA.
NR 13
TC 0
Z9 0
U1 0
U2 0
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN STREET, MALDEN 02148, MA USA
BN 978-1-118-38657-6
J9 BLACKWELL PHILOS POP
PY 2013
BP 151
EP 162
D2 10.1002/9781118572672
PG 12
WC Literary Theory & Criticism; Literature
SC Literature
GA BB2OH
UT WOS:000341972300014
ER
PT S
AU Zhou, H
Huie, L
Lai, LF
AF Zhou, Heng
Huie, Lauren
Lai, Lifeng
BE Matthews, MB
TI Key Generation Through Two-Way Relay Channels under Active Attacks
SO 2013 ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS
SE Conference Record of the Asilomar Conference on Signals Systems and
Computers
LA English
DT Proceedings Paper
CT 47th Asilomar Conference on Signals, Systems, and Computers
CY NOV 03-06, 2013
CL Pacific Grove, CA
SP IEEE Signal Proc Soc
DE Active attack; Information-theoretic security; Key generation; Two-way
relay channel
AB Most of the existing work on key generation from wireless fading channels requires a direct wireless link between legitimate users so that they can obtain correlated observations from the common wireless link. Furthermore, most of the existing work assumes that the attacker is passive. This paper studies the key generation problem in the two-way relay channel, in which there is no direct channel between the key generating terminals, under active attacks. We propose an effective key generation scheme. We also investigate the effects of the active attacker on the proposed key generation protocol. We characterize the optimal attacker's strategy that minimizes the key rate of the proposed scheme. Furthermore, we establish the maximal attacker's power under which our scheme can still achieve a non-zero key rate.
C1 [Zhou, Heng; Lai, Lifeng] Worcester Polytech Inst, Dept Elect & Comp Engn, Worcester, MA 01609 USA.
[Huie, Lauren] Air Force Res Lab, Informat Directorate, Griffiss AFB, NY 13441 USA.
RP Zhou, H (reprint author), Worcester Polytech Inst, Dept Elect & Comp Engn, Worcester, MA 01609 USA.
EM hzhou3@wpi.edu; Lauren.Huie@us.af.mil; llai@wpi.edu
FU National Science Foundation CAREER [CCF-13-18980]; NSF [CNS-13-21223];
Air Force Research Lab Information Directorate; Qatar National Research
Fund [NPRP-5-559-2-227]
FX The work of H. Zhou and L. Lai was supported in part by the National
Science Foundation CAREER award CCF-13-18980, NSF under grant
CNS-13-21223, Air Force Research Lab Information Directorate, and Qatar
National Research Fund under Grant NPRP-5-559-2-227.
NR 7
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1058-6393
BN 978-1-4799-2390-8
J9 CONF REC ASILOMAR C
PY 2013
BP 56
EP 60
PG 5
WC Computer Science, Information Systems; Engineering, Electrical &
Electronic; Telecommunications
SC Computer Science; Engineering; Telecommunications
GA BB2HD
UT WOS:000341772900010
ER
PT S
AU Hack, DE
Patton, LK
Himed, B
AF Hack, Daniel E.
Patton, Lee K.
Himed, Braham
BE Matthews, MB
TI A Unified Detection Framework for Distributed Active and Passive RF
Sensing
SO 2013 ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS
SE Conference Record of the Asilomar Conference on Signals Systems and
Computers
LA English
DT Proceedings Paper
CT 47th Asilomar Conference on Signals, Systems, and Computers
CY NOV 03-06, 2013
CL Pacific Grove, CA
SP IEEE Signal Proc Soc
ID PERFORMANCE; SYSTEMS
AB This work considers centralized detection in distributed RF sensor networks. We present a comparative analysis of GLRT detection in active and passive networks including active multiple-input multiple-output (MIMO) radar (AMR), passive MIMO radar (PMR), and passive source localization (PSL). Our results demonstrate that PMR generalizes AMR and PSL in that PMR detection sensitivity may approximate that of AMR or PSL depending on the average direct-path-to-noise ratio (DNR). At high DNR, PMR sensitivity equals AMR sensitivity. At low DNR, PMR sensitivity approximates PSL sensitivity. At intermediate DNRs, PMR sensitivity transitions from PSL to AMR sensitivity with increasing DNR. Thus, PMR may be regarded as the link between AMR and PSL sensor networks that unifies them within a common theoretical framework.
C1 [Hack, Daniel E.; Patton, Lee K.] Matrix Res Inc, Beavercreek, OH 45432 USA.
[Himed, Braham] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Hack, DE (reprint author), Matrix Res Inc, Beavercreek, OH 45432 USA.
EM dan.hack@matrixresearch.com; lee.patton@matrixresearch.com;
braham.himed@wpafb.af.mil
NR 8
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1058-6393
BN 978-1-4799-2390-8
J9 CONF REC ASILOMAR C
PY 2013
BP 449
EP 453
PG 5
WC Computer Science, Information Systems; Engineering, Electrical &
Electronic; Telecommunications
SC Computer Science; Engineering; Telecommunications
GA BB2HD
UT WOS:000341772900082
ER
PT S
AU Kang, BS
Monga, V
Rangaswamy, M
AF Kang, Bosung
Monga, Vishal
Rangaswamy, Muralidhar
BE Matthews, MB
TI Efficient Approximation of Structured Covariance under Joint Toeplitz
and Rank Constraints
SO 2013 ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS
SE Conference Record of the Asilomar Conference on Signals Systems and
Computers
LA English
DT Proceedings Paper
CT 47th Asilomar Conference on Signals, Systems, and Computers
CY NOV 03-06, 2013
CL Pacific Grove, CA
SP IEEE Signal Proc Soc
ID MAXIMUM-LIKELIHOOD-ESTIMATION; COMPOUND-GAUSSIAN CLUTTER; MATRICES
AB The disturbance (clutter plus noise and jamming) covariance matrix which plays a central role in radar space time adaptive processing (STAP) should be estimated from sample training observations in practice. Traditional maximum likelihood (ML) estimators lead to degraded false alarm and detection performance in the realistic regime of limited training. Therefore constrained ML estimation has received much attention which exploits structure and other properties that a disturbance covariance matrix exhibits. In this paper(1), we derive a new covariance estimator for STAP that jointly considers a Toeplitz structure and a rank constraint on the clutter component. Past work has shown that in the regime of low training, even handling each constraint individually is hard and techniques often resort to slow numerically based solutions. Our proposed solution leverages a recent advance called rank constrained ML estimator (RCML) of structured covariances to build a computationally friendly approximation that involves a cascade of two closed form solutions. Experimental investigation shows that the proposed estimator outperforms state of the art alternatives in the sense of: 1.) normalized signal to interference and noise ratio (SINR), and 2.) probability of detection versus signal to noise ratio (SNR).
C1 [Kang, Bosung; Monga, Vishal] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
[Rangaswamy, Muralidhar] Wright Patterson Air Force Base, Air Force Res Lab, Dayton, OH USA.
RP Kang, BS (reprint author), Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
EM bkang@psu.edu; vmonga@engr.psu.edu
FU AFOSR [FA9550-12-1-0333]
FX 1Research was supported by AFOSR grant number FA9550-12-1-0333.
NR 21
TC 1
Z9 1
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1058-6393
BN 978-1-4799-2390-8
J9 CONF REC ASILOMAR C
PY 2013
BP 692
EP 696
PG 5
WC Computer Science, Information Systems; Engineering, Electrical &
Electronic; Telecommunications
SC Computer Science; Engineering; Telecommunications
GA BB2HD
UT WOS:000341772900127
ER
PT S
AU Hersey, R
Bowden, D
Bruening, D
Westbrook, L
AF Hersey, Ryan
Bowden, David
Bruening, Dustin
Westbrook, Lamar
BE Matthews, MB
TI Radar Modeling and Validation of Human Gaits using Simultaneous
Collections of Motion Capture and Radar Data
SO 2013 ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS
SE Conference Record of the Asilomar Conference on Signals Systems and
Computers
LA English
DT Proceedings Paper
CT 47th Asilomar Conference on Signals, Systems, and Computers
CY NOV 03-06, 2013
CL Pacific Grove, CA
SP IEEE Signal Proc Soc
AB Previous research in radar modeling of the human gait has implemented motion defined by a kinematic walking model. While this model captures the fundamental walking characteristics, it is limited in practical application due to the generality of its definition. To increase the fidelity and realism of human gait modeling, we utilize motion capture and radar data measurements that are simultaneously collected. We utilize the motion capture data collections to provide accurate body segment locations over time. We incorporate this information into a radar model that calculates the coherent radar return from each segment at the time of each radar pulse. We validate this model using Ku-band radar measurements that were simultaneously collected with the motion capture data. We present and analyze results for walking, jogging, and throwing motions. Comparisons of the simulated and measured results show radar modeling with motion capture data accurately depicts the radar response in both range and Doppler.
C1 [Hersey, Ryan] Georgia Tech Res Inst, Atlanta, GA 30332 USA.
[Bowden, David; Bruening, Dustin; Westbrook, Lamar] US Air Force Res Lab, Wright Patterson AFB, OH USA.
RP Hersey, R (reprint author), Georgia Tech Res Inst, Atlanta, GA 30332 USA.
NR 4
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1058-6393
BN 978-1-4799-2390-8
J9 CONF REC ASILOMAR C
PY 2013
BP 931
EP 935
PG 5
WC Computer Science, Information Systems; Engineering, Electrical &
Electronic; Telecommunications
SC Computer Science; Engineering; Telecommunications
GA BB2HD
UT WOS:000341772900170
ER
PT S
AU Reale, JF
Huie, LM
Fowler, ML
AF Reale, Jack F.
Huie, Lauren M.
Fowler, Mark L.
BE Matthews, MB
TI Locating Closely Spaced Coherent Emitters Using TDOA Techniques
SO 2013 ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS
SE Conference Record of the Asilomar Conference on Signals Systems and
Computers
LA English
DT Proceedings Paper
CT 47th Asilomar Conference on Signals, Systems, and Computers
CY NOV 03-06, 2013
CL Pacific Grove, CA
SP IEEE Signal Proc Soc
ID SOURCE LOCALIZATION; MULTIPLE SOURCES; SIGNALS; GEOLOCATION; ALGORITHM;
ARRAYS; DELAY; FORM
AB This paper considers the problem of locating closely-spaced coherent emitters. Classical TDOA-based emitter location methods assume only a single emitter is being estimated. As a result, when multiple emitters that cannot be resolved during detection exist, the MSE performance is significantly degraded. These errors are due to the fact that the TDOA observation model does not account for multiple transmissions. We propose a new TDOA observation model that can resolve multiple emitted signals. We show a significant improvement in MSE when locating multiple emitters using our new model as compared with the classical one-emitter assumption TDOA model.
C1 [Reale, Jack F.; Huie, Lauren M.] Air Force Res Lab, Informat Directorate, Griffiss AFB, NY 13441 USA.
[Reale, Jack F.; Fowler, Mark L.] SUNY Binghamton, Dept Elect & Comp Engn, Binghamton, NY 13902 USA.
RP Reale, JF (reprint author), Air Force Res Lab, Informat Directorate, Griffiss AFB, NY 13441 USA.
EM jack.reale@rl.af.mil; lauren.huie@rl.af.mil; mfowler@binghamton.edu
NR 16
TC 0
Z9 0
U1 1
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1058-6393
BN 978-1-4799-2390-8
J9 CONF REC ASILOMAR C
PY 2013
BP 2160
EP 2164
PG 5
WC Computer Science, Information Systems; Engineering, Electrical &
Electronic; Telecommunications
SC Computer Science; Engineering; Telecommunications
GA BB2HD
UT WOS:000341772900390
ER
PT J
AU Subedi, S
Zhang, YMD
Amin, MG
Himed, B
AF Subedi, Saurav
Zhang, Yimin D.
Amin, Moeness G.
Himed, Braham
GP IEEE
TI ROBUST MOTION PARAMETER ESTIMATION IN MULTISTATIC PASSIVE RADAR
SO 2013 PROCEEDINGS OF THE 21ST EUROPEAN SIGNAL PROCESSING CONFERENCE
(EUSIPCO)
LA English
DT Proceedings Paper
CT 21st European Signal Processing Conference (EUSIPCO)
CY SEP 09-13, 2013
CL Marrakesh, MOROCCO
DE multistatic passive radar; target tracking; motion parameter estimation;
compressive sensing
AB In this paper, we develop a new algorithm for motion parameter estimation of moving targets in a multistatic passive radar. Existing methods for motion parameter estimation rely on the estimated Doppler signatures of the observed signals corresponding to each transmitter. These techniques may fail for weak signals where the individual Doppler signature cannot be properly estimated. The focus of this paper is on motion parameter estimation from weak signals observed using multiple illuminators. Utilizing the sparsity of the motion parameters, the proposed technique obtains robust motion parameter estimates through the fusion of the data corresponding to all available illuminators, achieving signal enhancement and multistatic diversity. To reduce the computational cost, the acceleration and velocity parameters are decoupled and sequentially estimated.
C1 [Subedi, Saurav; Zhang, Yimin D.; Amin, Moeness G.] Villanova Univ, Ctr Adv Commun, Villanova, PA 19085 USA.
[Himed, Braham] ARFK RTND, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Subedi, S (reprint author), Villanova Univ, Ctr Adv Commun, Villanova, PA 19085 USA.
FU Air Force Research Laboratory (AFRL) [FA8650-08-D-1303]
FX The work of S. Subedi, Y. D. Zhang, and M. G. Amin is supported in part
by a subcontract with Dynetics, Inc. for research sponsored by the Air
Force Research Laboratory (AFRL) under Contract FA8650-08-D-1303.
NR 13
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
PY 2013
PG 5
WC Engineering, Electrical & Electronic
SC Engineering
GA BB2GC
UT WOS:000341754500246
ER
PT J
AU Liang, PP
Ling, HB
Blasch, E
Seetharaman, G
Shen, D
Chen, GS
AF Liang, Pengpeng
Ling, Haibin
Blasch, Erik
Seetharaman, Guna
Shen, Dan
Chen, Genshe
GP IEEE
TI Vehicle Detection in Wide Area Aerial Surveillance using Temporal
Context
SO 2013 16TH INTERNATIONAL CONFERENCE ON INFORMATION FUSION (FUSION)
LA English
DT Proceedings Paper
CT 16th International Conference on Information Fusion (FUSION)
CY JUL 09-12, 2013
CL Istanbul, TURKEY
SP HAVELSAN, METEKSAN SAVUNMA, TUBITAK, METRON Sci Solut, Off Naval Res Global Sci & Technol, Ankara Univ, Sabanci Univ, STM, TAI, ASELSAN, Koc Bilgi Savunma Teknolojileri A S, Kale Havacilik, Int Soc Infromat Fus, IEEE, AESS
AB Moving vehicle detection from wide area aerial surveillance is an important and challenging task, which can be aided by context information. In this paper, we present a Temporal Context(TC) which can capture the road information. In contrast with previous methods to exploit road information, TC does not need to get the location of the road first or to use the Geographical Information System's (GIS) information. We first use background subtraction to generate the candidates, then build TC based on the candidates that have been classified as positive by Histograms of Oriented Gradient(HOG) with Multiple Kernel Learning(MKL). For each positive candidate, a region around the candidate is divided into several subregions based on the direction of the candidate, then each subregion is divided into 12 bins with a fixed length; and finally the TC, a histogram, is built according to the positions of the positive candidates in 8 consecutive frames. In order to benefit from both the appearance and context information, we use MKL to combine TC and HOG. To evaluate the effect of TC, we use the publicly available CLIF 2006 dataset, and label the vehicles in 102 frames which are 2672 x 1200 subregions that contain expressway of the original 2672 x 4008 images. The experiments demonstrate that the proposed TC is useful to remove the false positives that are away from the road, and the combination of TC and HOG with MKL outperforms the use of TC or HOG only.
C1 [Liang, Pengpeng; Ling, Haibin] Temple Univ, Comp & Informat Sci Dept, Philadelphia, PA 19122 USA.
[Blasch, Erik; Seetharaman, Guna] US Air Force, Res Lab, Philadelphia, PA 19122 USA.
[Shen, Dan; Chen, Genshe] Intelligent Fus Technol Inc, Germantown, MD USA.
RP Liang, PP (reprint author), Temple Univ, Comp & Informat Sci Dept, Philadelphia, PA 19122 USA.
EM pliang@temple.edu; hbling@temple.edu; erik.blasch@rl.af.mil;
Gunasekaran.Seetharaman@rl.af.mil; gchen@intfusiontech.com
NR 34
TC 2
Z9 2
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-605-86311-1-3
PY 2013
BP 181
EP 188
PG 8
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BB1UM
UT WOS:000341370000025
ER
PT J
AU Wetterer, CJ
Chow, CC
Crassidis, JL
Linares, R
Jah, MK
AF Wetterer, Charles J.
Chow, C. Channing
Crassidis, John L.
Linares, Richard
Jah, Moriba K.
GP IEEE
TI Simultaneous Position, Velocity, Attitude, Angular Rates, and Surface
Parameter Estimation Using Astrometric and Photometric Observations
SO 2013 16TH INTERNATIONAL CONFERENCE ON INFORMATION FUSION (FUSION)
LA English
DT Proceedings Paper
CT 16th International Conference on Information Fusion (FUSION)
CY JUL 09-12, 2013
CL Istanbul, TURKEY
SP HAVELSAN, METEKSAN SAVUNMA, TUBITAK, METRON Sci Solut, Off Naval Res Global Sci & Technol, Ankara Univ, Sabanci Univ, STM, TAI, ASELSAN, Koc Bilgi Savunma Teknolojileri A S, Kale Havacilik, Int Soc Infromat Fus, IEEE, AESS
DE estimation; data fusion; BRDF
AB Astrometric and photometric data fusion for the purposes of simultaneous position, velocity, attitude, and angular rate estimation has been demonstrated in the past. This state estimation is extended to include the various surface parameters associated with the bidirectional reflectance distribution function (BRDF). Additionally, a physically consistent BRDF and radiation pressure model is utilized thus enabling an accurate physical link between the observed photometric brightness and the attitudinal dynamics and ultimately the orbital dynamics. An example scenario is then presented where the model is an uncontrolled High Area to Mass Ratio (HAMR) object in geosynchronous Earth orbit and the position, velocity, attitude, angular rates, and surface parameters are estimated simultaneously
C1 [Wetterer, Charles J.; Chow, C. Channing] Pacific Def Solut LLC, Kihei, HI 96753 USA.
[Crassidis, John L.; Linares, Richard] Univ Buffalo, Dept Mech & Aerosp Engn, Amherst, NY USA.
[Jah, Moriba K.] US Air Force, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM USA.
RP Wetterer, CJ (reprint author), Pacific Def Solut LLC, Kihei, HI 96753 USA.
EM jack.wetterer@pacificds.com; johnc@buffalo.edu;
moribajah@kirtland.af.mil
FU Small Business Innovative Research (SBIR) [FA9453-11-C-0154]; Air Force
Research Laboratory (AFRL) at Kirtland Air Force Base; SBIR Phase I
[FA945 1-12-M-03 1 1]; AFRL
FX This work is sponsored by a Small Business Innovative Research (SBIR)
contract FA9453-11-C-0154 by the Air Force Research Laboratory (AFRL) at
Kirtland Air Force Base. Some of the code was also produced under the
SBIR Phase I contract FA945 1-12-M-03 1 1, also sponsored by AFRL. The
authors also wish to acknowledge useful discussions and technical
contributions made by other members of the SBIR team: Paul Cefola of
University at Buffalo, and Keric Hill of Pacific Defense Solutions, LLC.
NR 8
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-605-86311-1-3
PY 2013
BP 997
EP 1004
PG 8
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BB1UM
UT WOS:000341370000133
ER
PT J
AU Tian, X
Chen, GS
Blasch, E
Pham, K
Bar-Shalom, Y
AF Tian, Xin
Chen, Genshe
Blasch, Erik
Pham, Khanh
Bar-Shalom, Yaakov
GP IEEE
TI Comparison of three Approximate kinematic Models for Space Object
Tracking
SO 2013 16TH INTERNATIONAL CONFERENCE ON INFORMATION FUSION (FUSION)
LA English
DT Proceedings Paper
CT 16th International Conference on Information Fusion (FUSION)
CY JUL 09-12, 2013
CL Istanbul, TURKEY
SP HAVELSAN, METEKSAN SAVUNMA, TUBITAK, METRON Sci Solut, Off Naval Res Global Sci & Technol, Ankara Univ, Sabanci Univ, STM, TAI, ASELSAN, Koc Bilgi Savunma Teknolojileri A S, Kale Havacilik, Int Soc Infromat Fus, IEEE, AESS
DE tracking; space situation awareness; kinematic model; filter design,
Keplerian state model
AB In this paper we compare the performance of three kinematic state models, i.e., the White Noise Acceleration (WNA), the Wiener process acceleration (WPA), and the Keplerian State (KPS) model, for the tracking of earth orbiting space objects (SOs). The three models considered are all simplified approximate models for the motion of Earth orbiting SOs and are not suitable for the prediction of target tracks for long time periods. However, for track updates with new measurements coming at a high rate, such simplified motion models can be effectively used with small or no loss in estimation accuracy. For the KPS model, we use a novel mixed-coordinate SO tacking (McSOT) filter, where the target state space is defined in the Cartesian, i.e., Earth-Central Inertial (ECI), coordinates for track representation and updates, while the track propagation is done in the Keplerian Coordinates. It is shown that when the measurement accuracy is high, the McSOT filter with the KPS model, which has the highest complexity among the three, is able to achieve significantly better estimation accuracy than the filters with the WNA and WPA models. The WPA model is able to achieve better tracking accuracy than the WNA model at the cost of moderate increase of algorithm complexity. On the other hand, when the measurement accuracy is low, the filters with the WNA and WPA models which operate solely in the Cartesian coordinates, i.e., the Earth-Central Inertial (ECI) coordinates, is more robust than the McSOT filter with the KPS model.
C1 [Tian, Xin; Chen, Genshe] Intelligent Fus Technol Inc, 20271 Goldenrod Lane,Suite 2066, Germantown, MD 20876 USA.
[Blasch, Erik] US Air Force, Res Lab, Informat Directorate, Rome, NY USA.
[Pham, Khanh] US Air Force, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM USA.
[Bar-Shalom, Yaakov] Univ Connecticut, Dept ECE, Storrs, CT 06269 USA.
RP Tian, X (reprint author), Intelligent Fus Technol Inc, 20271 Goldenrod Lane,Suite 2066, Germantown, MD 20876 USA.
EM xtian@intfusiontech.com; gchen@intfusiontech.com; erik.blasch@rl.af.mil;
khanh.pham@kirtland.af.mil; ybs@ee.uconn.edu
FU United State Air Force [FA9453-12-M-0022, FA9453-12-M-0084]
FX This work is sponsored by United State Air Force Under contract
FA9453-12-M-0022 and FA9453-12-M-0084.
NR 21
TC 2
Z9 2
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-605-86311-1-3
PY 2013
BP 1005
EP 1012
PG 8
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BB1UM
UT WOS:000341370000134
ER
PT S
AU Wrosch, M
Walmsley, N
Stern, T
Hausgen, P
Wilt, D
Jenkins, P
AF Wrosch, Matthew
Walmsley, Nicholas
Stern, Theodore
Hausgen, Paul
Wilt, David
Jenkins, Phillip
GP IEEE
TI Laminated Solar Panels for Space Using Multi-Cell Transparent Covers
SO 2013 IEEE 39TH PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
SE IEEE Photovoltaic Specialists Conference
LA English
DT Proceedings Paper
CT 39th IEEE Photovoltaic Specialists Conference (PVSC)
CY JUN 16-21, 2013
CL Tampa, FL
SP Inst Elect & Elect Engineers, Inst Elect & Elect Engineers Electron Devices Soc, Inst Elect & Elect Engineers Photon Soc, Inst Elect & Elect Engineers Power & Energy Soc, US Photovolta Mfg Consort, AZoCleantech Com, Latin Amer Renovable, Photovolta Int, PVTech, Solar Novus Today & Photon, Photon
DE solar cell assembly; encapsulated solar panels; inverted metamorphic
cells; space environmental durability
AB An approach to laying down, interconnecting, and encapsulating a space solar panel module is described that uses large-area multi-cell transparent covers. Coverglass replacement materials were evaluated and tested in a variety of environments, including a flight test on MISSE-7, and found to be durable in the LEO environment, with approaches to extending durability to GEO and other high radiation environments. The multi-cell cover approach enables assembling advanced cells, such as IMM, into a thin array using a laminating approach that implements co-planar front contact cells with thermosonic wire bonding interconnection. Coupons of the encapsulated panels were fabricated and found to have good durability in thermal cycling.
C1 [Wrosch, Matthew; Walmsley, Nicholas; Stern, Theodore] Vanguard Space Technol Inc, San Diego, CA 92126 USA.
[Hausgen, Paul; Wilt, David] US Air Force, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Jenkins, Phillip] US Navy, Res Lab, Washington, DC 20002 USA.
RP Wrosch, M (reprint author), Vanguard Space Technol Inc, San Diego, CA 92126 USA.
FU Air Force Research Laboratory Space Vehicles Directorate; Naval Research
Laboratory
FX This work was supported by the Air Force Research Laboratory Space
Vehicles Directorate and the Naval Research Laboratory
NR 1
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0160-8371
BN 978-1-4799-3299-3
J9 IEEE PHOT SPEC CONF
PY 2013
BP 2809
EP 2811
PG 3
WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied
SC Energy & Fuels; Materials Science; Physics
GA BB0AV
UT WOS:000340054100640
ER
PT J
AU True, MW
Cranston, MM
Hatzfeld, MJJ
AF True, Mark W.
Cranston, Marcus M.
Hatzfeld, Ma Jennifer J.
TI The U.S. Air Force Diabetes and Obesity Research Working Group: A Model
for Building Military-Specific Clinical Research Infrastructure
SO MILITARY MEDICINE
LA English
DT Editorial Material
C1 [True, Mark W.] Endocrinol Flight, Lackland AFB, TX USA.
[Cranston, Marcus M.] Med Educ, Med Grp 99, Nellis AFB, NV USA.
[Hatzfeld, Ma Jennifer J.] Clin Invest Facil, Travis AFB, CA USA.
RP True, MW (reprint author), Endocrinol Flight, 59 Med Operat Squadron, Lackland AFB, TX USA.
NR 2
TC 2
Z9 2
U1 0
U2 0
PU ASSOC MILITARY SURG US
PI BETHESDA
PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 USA
SN 0026-4075
EI 1930-613X
J9 MIL MED
JI Milit. Med.
PD JAN
PY 2013
VL 178
IS 1
BP 1
EP 2
DI 10.7205/MILMED-D-12-00401
PG 2
WC Medicine, General & Internal
SC General & Internal Medicine
GA AN7TV
UT WOS:000340804800004
PM 23356109
ER
PT J
AU Dukes, SF
Bridges, E
Johantgen, M
AF Dukes, Susan F.
Bridges, Elizabeth
Johantgen, Meg
TI Occurrence of Secondary Insults of Traumatic Brain Injury in Patients
Transported by Critical Care Air Transport Teams From Iraq/Afghanistan:
2003-2006
SO MILITARY MEDICINE
LA English
DT Article
ID SEVERE HEAD-INJURY; INTENSIVE-CARE; INTRACRANIAL-PRESSURE; IRAQI
FREEDOM; IMPACT; HYPERGLYCEMIA; TEMPERATURE; HYPOTHERMIA; MORTALITY;
WARTIME
AB Traumatic brain injury patients are susceptible to secondary insults to the injured brain. A retrospective cohort study was conducted to describe the occurrence of secondary insults in 63 combat casualties with severe isolated traumatic brain injury who were transported by the U.S. Air Force Critical Care Air Transport Teams (CCATT) from 2003 through 2006. Data were obtained from the Wartime Critical Care Air Transport Database, which describes the patient's physiological state and care as they are transported across the continuum of care from the area of responsibility (Iraq/Afghanistan) to Germany and the United States. Fifty-three percent of the patients had at least one documented episode of a secondary insult. Hyperthermia was the most common secondary insult and was associated with severity of injury. The hyperthermia rate increased across the continuum, which has implications for en route targeted temperature management. Hypoxia occurred most frequently within the area of responsibility, but was rare during CCATT flights, suggesting that concerns for altitude-induced hypoxia may not be a major factor in the decision when to move a patient. Similar research is needed for polytrauma casualties and analysis of the association between physiological status and care across the continuum and long-term outcomes.
C1 [Dukes, Susan F.] US Air Force, Sch Aerosp Med, Wright Patterson AFB, OH 45433 USA.
[Bridges, Elizabeth] Univ Washington, Seattle, WA 98195 USA.
[Johantgen, Meg] Univ Maryland, Sch Nursing, Baltimore, MD 21201 USA.
RP Dukes, SF (reprint author), US Air Force, Sch Aerosp Med, 2510 5th St, Wright Patterson AFB, OH 45433 USA.
NR 40
TC 6
Z9 6
U1 0
U2 3
PU ASSOC MILITARY SURG US
PI BETHESDA
PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 USA
SN 0026-4075
EI 1930-613X
J9 MIL MED
JI Milit. Med.
PD JAN
PY 2013
VL 178
IS 1
BP 11
EP 17
DI 10.7205/MILMED-D-12-00177
PG 7
WC Medicine, General & Internal
SC General & Internal Medicine
GA AN7TV
UT WOS:000340804800007
PM 23356112
ER
PT J
AU Holycross, CM
Srinivasan, R
George, TJ
Tamirisakandala, S
Russ, SM
AF Holycross, Casey M.
Srinivasan, Raghavan
George, Tommy J.
Tamirisakandala, Seshacharyulu
Russ, Stephan M.
BE Srivatsan, TS
Imam, MA
Srinivasan, R
TI HIGH FREQUENCY VIBRATION BASED FATIGUE TESTING OF DEVELOPMENTAL ALLOYS
SO FATIGUE OF MATERIALS II: ADVANCES AND EMERGENCES IN UNDERSTANDING
LA English
DT Proceedings Paper
CT 2nd International Symposium on Fatigue of Materials - Advanced and
Emergences in Understanding held during the Materials Science and
Technology (MS and T) Meeting
CY OCT 07-11, 2012
CL Pittsburgh, PA
SP Minerals, Met & Mat Soc, Mech Behav Mat Comm, ASM Int
DE Fatigue; Titanium; Vibration; Powder-metallurgy
AB Many fatigue test methods have been previously developed to rapidly evaluate fatigue behavior. This increased test speed can come at some expense; since these methods may require non-standard specimen geometry or increased facility and equipment capability. One such method, developed by George et al, involves a base-excited plate specimen driven into a high frequency bending resonant mode. This resonant mode is of sufficient frequency (typically 1200 to 1700 Hertz) to accumulate 107 cycles in a few hours. One of the main limitations of this test method is that fatigue cracking is almost certainly guaranteed to be surface initiated at regions of high stress. This brings into question the validity of the fatigue test results, as compared to more traditional uniaxial, smooth-bar testing, since high stresses are subjecting only a small volume to fatigue damage. This limitation also brings into question the suitability of this method to screen developmental alloys, should their initiation life be governed by subsurface flaws. However, if applicable, the rapid generation of fatigue data using this method would facilitate faster design iterations, identifying more quickly, material and manufacturing process deficiencies. The developmental alloy used in this study was a powder metallurgy boron-modified Ti-6Al-4V, a new alloy currently being considered for gas turbine engine fan blades. Plate specimens were subjected to fully reversed bending fatigue. Results are compared with existing data from commercially available Ti-6Al-4V using both vibration based and more traditional fatigue test methods.
C1 [Holycross, Casey M.; George, Tommy J.] Air Force Res Lab, Prop Directorate, Bldg 18D,1950 Fifth St, Wright Patterson AFB, OH 45433 USA.
[Holycross, Casey M.; Srinivasan, Raghavan] Wright State Univ, Dept Mech & Mat Engn, Dayton, OH 45435 USA.
[Tamirisakandala, Seshacharyulu] RTI Int Met Inc, Niles, OH 44446 USA.
[Russ, Stephan M.] US Air Force, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Holycross, CM (reprint author), Air Force Res Lab, Prop Directorate, Bldg 18D,1950 Fifth St, Wright Patterson AFB, OH 45433 USA.
FU AFRL
FX The authors would like to thank the Propulsion and the Materials and
Manufacturing Directorates of AFRL for financial, facility, and
equipment support.
NR 16
TC 0
Z9 0
U1 0
U2 3
PU JOHN WILEY & SONS
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND
BN 978-1-11852-093-2
PY 2013
BP 39
EP 46
PG 8
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA BA9BJ
UT WOS:000339099500004
ER
PT S
AU Hong, GY
Pachter, R
AF Hong, Gongyi
Pachter, Ruth
BE Fenton, JM
Kulesza, PJ
Weidner, J
TI Biodegradation of Lignin by Laccase for Conversion of Biomass to Fuel:
Analysis of Substrate Binding
SO SOLAR FUELS 2
SE ECS Transactions
LA English
DT Proceedings Paper
CT Symposium on Solar Fuels 2 held during the 223rd Meeting of the
Electrochemical-Society (ECS)
CY MAY 12-16, 2013
CL Toronto, CANADA
SP Electrochem Soc, Energy Technol Div, Ind Electrochemistry & Electrochem Engn Div, Phys & Analyt Electrochemistry Div
ID FUNGUS TRAMETES-VERSICOLOR; CRYSTAL-STRUCTURE; MELANOCARPUS-ALBOMYCES;
MULTICOPPER OXIDASES; ANGSTROM RESOLUTION; PHENOLIC-COMPOUNDS; FULL
COMPLEMENT; FORCE-FIELD; OXIDATION; PARAMETERS
AB Laccases play an important role in biodegradation of lignin, particularly by mediation with easily oxidizable phenolic compounds through a radical-catalyzed reaction. Such processes may potentially be considered for turning lignocellulosic biomass into fuel. In this work, in order to better understand effects of the phenolic compound bulkiness, binding propensity of six substrates that vary in steric hindrance was considered. Changes in binding affinity, also upon mutation, were analyzed for a range of laccases. The results reveal the potential for improved binding of various laccases and their mutations, to be considered in future work.
C1 [Hong, Gongyi; Pachter, Ruth] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Hong, GY (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
NR 39
TC 0
Z9 0
U1 0
U2 2
PU ELECTROCHEMICAL SOC INC
PI PENNINGTON
PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA
SN 1938-5862
BN 978-1-62332-121-5; 978-1-60768-476-3
J9 ECS TRANSACTIONS
PY 2013
VL 53
IS 24
BP 1
EP 10
DI 10.1149/05324.0001ecst
PG 10
WC Electrochemistry; Energy & Fuels
SC Electrochemistry; Energy & Fuels
GA BA9EF
UT WOS:000339300800001
ER
PT S
AU Su, YJ
Retterer, JM
Caton, RG
Stoneback, RA
Pfaff, RF
Roddy, PA
Groves, KM
AF Su, Yi-Jiun
Retterer, John M.
Caton, Ronald G.
Stoneback, Russell A.
Pfaff, Robert F.
Roddy, Patrick A.
Groves, Keith M.
BE Huba, J
Schunk, R
Khazanov, G
TI Air Force Low-Latitude Ionosphe
SO MODELING THE IONOSPHERE-THERMOSPHERE SYSTEM
SE Geophysical Monograph Book Series
LA English
DT Proceedings Paper
CT AGU Chapman Conference on Modeling the Ionosphere/Thermosphere System
CY MAY 06-12, 2011
CL Charleston, SC
SP AGU
ID EQUATORIAL SPREAD F; SCINTILLATION; JICAMARCA; DRIFTS
AB In this article, we describe and demonstrate the capabilities of the low-latitude physics-based ionospheric model (PBMOD) developed at the Air Force Research Laboratory to specify radio scintillations using data collected during an April 2009 campaign dedicated to measurements with the Communication/Navigation Outage Forecasting System (C/NOFS). The electric fields/plasma drifts are believed to be the primary driver of the dynamics in the low-latitude ionosphere. With electric field measurements ingested into PBMOD, estimated scintillation strengths (S4) were comparable with ground measurements at 250 MHz recorded at Anocn, Peru; Christmas Island; and Kwajalein Atoll. These scintillations were associated with upward plasma drifts, although in some places, actual conditions were not precisely determined due to data gaps caused by spurious fields. We also present simulation results obtained from PBMOD driven by four different empirical drift models to specify global ionospheric densities. Discrete longitudinal structures are evident in both averaged density and drift observations. Density outputs from C/NOFS-driven simulations present similar wave 3 or wave 4 structures in geographical longitudes. In contrast, such density structures, likely associated with atmospheric tides, are absent when driving PBMOD with Scherliess-Fejer drifts. Model results have been quantitatively compared with in situ density measurements obtained from C/NOFS, Defense Meteorological Satellite Program, and CHAMP at altitudes ranging from similar to 350 to 850 km. We found that, on average, the smallest error in modeled densities came from simulations driven by the Ion Velocity Drift Meter drifts. We expect to increase the accuracy of forecasted low-latitude ionospheric densities with more accurate and continuous plasma drift measurements.
C1 [Su, Yi-Jiun; Caton, Ronald G.; Roddy, Patrick A.] Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Retterer, John M.; Groves, Keith M.] Boston Coll, Inst Sci Res, Chestnut Hill, MA USA.
[Stoneback, Russell A.] Univ Texas Dallas, Dept Phys, Dallas, TX USA.
[Stoneback, Russell A.] Univ Texas Dallas, Ctr Space Sci, Dallas, TX USA.
[Pfaff, Robert F.] Natl Aeronaut & Space Adm, Goddard Space Flight Ctr, Greenbelt, MD USA.
RP Su, YJ (reprint author), Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
EM Yi-Jiun.Su@kirtland.af.mil
FU AFRL; Department of Defense Space Test Program; National Aeronautics and
Space Administration; Naval ResearchLaboratory; Aerospace Corporation;
NASA [NNH09AK051]; AFOSR [11RV04COR, 12RV10COR]
FX The C/NOFS mission is supported by the AFRL, the Department of Defense
Space Test Program, the National Aeronautics and Space Administration,
the Naval ResearchLaboratory, and the Aerospace Corporation. The first
author thanks the IVM principle investigator, R. A. Heelis, for
supporting the usage of drift data. This research task was supported, in
part, by the NASA grant NNH09AK051, the AFOSR grants 11RV04COR and
12RV10COR to AFRL, and the Ionospheric Impacts on RF Systems 6.2 program
at AFRL.
NR 37
TC 0
Z9 0
U1 0
U2 1
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0065-8448
BN 978-1-118-70441-7; 978-0-87590-490-0
J9 GEOPHYS MONOGR SER
PY 2013
VL 201
BP 107
EP 117
DI 10.1029/2012GM001268
PG 11
WC Geochemistry & Geophysics; Mathematics, Interdisciplinary Applications;
Meteorology & Atmospheric Sciences
SC Geochemistry & Geophysics; Mathematics; Meteorology & Atmospheric
Sciences
GA BA8FV
UT WOS:000338043600011
ER
PT B
AU Adkins, F
Carlisle, M
Jones, L
Upchurch, J
AF Adkins, Francis
Carlisle, Martin
Jones, Luke
Upchurch, Jason
GP IEEE
TI Heuristic Malware Detection via Basic Block Comparison
SO PROCEEDINGS OF THE 2013 8TH INTERNATIONAL CONFERENCE ON MALICIOUS AND
UNWANTED SOFTWARE: THE AMERICAS (MALWARE)
LA English
DT Proceedings Paper
CT 8th International Conference on Malicious and Unwanted Software - The
Americas (MALWARE)
CY OCT 22-24, 2013
CL Fajardo, PR
SP IEEE Comp Soc, Wireless Syst Secur Res Lab, Trend Micro
DE Distribution A; Approved for public release; distribution unlimited
AB Each day, malware analysts are tasked with more samples than they have the ability to analyze by hand. To produce this trend, malware authors often reuse a significant portion of their code. In this paper, we introduce a technique to statically decompose malicious software to identify shared code. This technique variably applies a sliding-window methodology to either full files or individual basic blocks to produce representative similarity ratios either between two binaries or between two functionalities within binaries, respectively. This grants the ability to apply heuristic detection via threshold similarity matching as well as full-inclusivity matching for malicious functionality. Additionally, we apply generalization techniques to minimize local assembly variants while still maintaining consistent structural matching. We also identify improvements that this technique provides over previous technologies and demonstrate its success in practical sample detection. Finally, we suggest further applications of this technique and highlight possible contributions to modern malware detection.
C1 [Adkins, Francis; Carlisle, Martin; Jones, Luke] US Air Force Acad, Dept Comp Sci, Colorado Springs, CO 80840 USA.
[Upchurch, Jason] US Air Force Acad, Ctr Innovat, Colorado Springs, CO 80840 USA.
RP Adkins, F (reprint author), US Air Force Acad, Dept Comp Sci, Colorado Springs, CO 80840 USA.
EM Francis.Adkins.1@us.af.mil; Martin.Carlisle@usafa.edu;
Luke.Jones.2@us.af.mil; Jason.Upchurch.ctr@usafa.edu
FU United States Air Force Academy [FA700011-20001]
FX This work was created in the performance of a Cooperative Research and
Development Agreement with the Department of the Air Force. The
Government of the United States has certain rights to use this work. The
Department of Homeland Security (DHS) sponsors the Center of Innovation
at the United States Air Force Academy, which conducts research for
educational purposes. The United States Air Force Academy and DHS
sponsored the production of this material under United States Air Force
Academy agreement number FA700011-20001. The U.S. Government is
authorized to reproduce and distribute reprints for Governmental
purposes notwithstanding any copyright notation thereon. The views and
conclusions contained herein are those of the authors and should not be
interpreted as necessarily representing the official policies or
endorsements, either expressed or implied, of The United States Air
Force Academy, the Department of Defense, or the U.S. Government.
NR 19
TC 3
Z9 3
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4799-2535-3; 978-1-4799-2534-6
PY 2013
BP 11
EP 18
PG 8
WC Computer Science, Information Systems; Computer Science, Software
Engineering
SC Computer Science
GA BA8LD
UT WOS:000338255400002
ER
PT B
AU Upchurch, J
Zhou, XB
AF Upchurch, Jason
Zhou, Xiaobo
GP IEEE
TI First Byte: Force-Based Clustering of Filtered Block N-Grams to Detect
Code Reuse in Malicious Software
SO PROCEEDINGS OF THE 2013 8TH INTERNATIONAL CONFERENCE ON MALICIOUS AND
UNWANTED SOFTWARE: THE AMERICAS (MALWARE)
LA English
DT Proceedings Paper
CT 8th International Conference on Malicious and Unwanted Software - The
Americas (MALWARE)
CY OCT 22-24, 2013
CL Fajardo, PR
SP IEEE Comp Soc, Wireless Syst Secur Res Lab, Trend Micro
AB Detecting code reuse in malicious software is complicated by the lack of source code. The same circumstance that makes code reuse detection in malicious software desirable, that is, the limited availability of original source code, also contributes to the difficulty of detecting code reuse. In this paper, we propose a method for detecting code reuse in software, specifically malicious software, that moves beyond the limitations of targeting variant detection (categorization of families). This method expands n-gram analysis to target basic blocks extracted from compiled code vice entire text sections. It also targets individual relationships between basic blocks found in localized code reuse, while preserving the ability to detect variants and families of variants found with generalized code reuse. We demonstrate the limitations of similarity calculated without first disassembling the instructions and show that our First Byte normalization gives dramatic improvements in detection of code reuse. To visualize results, our method proposes force-based clustering as a solution to rapidly detect relationships between compiled binaries and detect relationships without complex analysis. Our methods retain the previously demonstrated ability of n-gram analysis to detect variants, while adding the ability to detect code reuse in non-variant malware. We show that our proposed filtering method reduces the number of similarity calculations and highlights only meaningful relationships in our malware set.
C1 [Upchurch, Jason] US Air Force Acad, Ctr Innovat, Colorado Springs, CO 80840 USA.
[Upchurch, Jason] Intel Corp, Intel Labs, Hillsboro, OR USA.
[Upchurch, Jason; Zhou, Xiaobo] Univ Colorado, Dept Comp Sci, Boulder, CO 80309 USA.
RP Upchurch, J (reprint author), US Air Force Acad, Ctr Innovat, Colorado Springs, CO 80840 USA.
EM jason.upchurch.ctr@usafa.edu; xzhou@uccs.edu
FU United States Air Force Academy; DHS under United States Air Force
Academy [FA700011-20001]
FX The United States Air Force Academy and DHS sponsored the production of
portions of this material under United States Air Force Academy
agreement number FA700011-20001
NR 24
TC 1
Z9 1
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4799-2535-3; 978-1-4799-2534-6
PY 2013
BP 68
EP 76
PG 9
WC Computer Science, Information Systems; Computer Science, Software
Engineering
SC Computer Science
GA BA8LD
UT WOS:000338255400009
ER
PT S
AU Fallahi, M
Bedford, R
AF Fallahi, M.
Bedford, R.
BE Baranov, A
Tournie, E
TI High-power semiconductor lasers
SO SEMICONDUCTOR LASERS: FUNDAMENTALS AND APPLICATIONS
SE Woodhead Publishing Series in Electronic and Optical Materials
LA English
DT Article; Book Chapter
DE semiconductor lasers; high power; brightness; figures-of-merits;
catastrophic optical mirror damage; passivation; broad-area lasers;
tapered cavity; distributed feedback (DFB); distributed Bragg reflector
(DBR); vertical-external-cavity suface-emitting laser (VECSEL); long
wavelength; laser array
ID QUANTUM-CASCADE LASERS; SURFACE-EMITTING LASERS; CONTINUOUS-WAVE
OPERATION; AVERAGE OUTPUT POWER; CIRCULAR TEM00 BEAMS; ROOM-TEMPERATURE;
MU-M; DIODE-LASER; SINGLE-FREQUENCY; DAMAGE LEVEL
AB Over the last decades, high-power and high-brightness semiconductor lasers have transformed the solid-state laser, telecommunication, medical and military markets. This chapter covers concepts, characteristics and challenges of high-power semiconductor lasers. We begin by describing general considerations including epitaxial design, laser cavity designs and packaging specific to high-power lasers. We introduce several common high-power and high-brightness semiconductor lasers such as Fabry-P rot lasers, grating-based lasers, large mode-area lasers, and optically pumped lasers, as well as concepts for long-wavelength operation. Arrays of devices for ultra-high-power are introduced, and device reliability challenges are addressed.
C1 [Fallahi, M.] Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA.
[Bedford, R.] Air Force Res Lab, Albuquerque, NM USA.
RP Fallahi, M (reprint author), Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA.
EM fallahi@optics.arizona.edu; Robert.bedford@wpafb.af.mil
NR 112
TC 0
Z9 0
U1 2
U2 9
PU WOODHEAD PUBL LTD
PI CAMBRIDGE
PA ABINGTON HALL ABINGTON, CAMBRIDGE CB1 6AH, CAMBS, ENGLAND
SN 2050-1501
BN 978-0-85709-640-1; 978-0-85709-121-5
J9 WOODH PUB SER ELECT
PY 2013
IS 33
BP 81
EP 120
DI 10.1533/9780857096401.1.81
D2 10.1533/9780857096401
PG 40
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BA4QJ
UT WOS:000336137100004
ER
PT J
AU Yue, HL
Brown, D
Subramanyam, G
Leedy, K
Cerny, C
AF Yue, Hailing
Brown, Dustin
Subramanyam, Guru
Leedy, Kevin
Cerny, Charles
GP IEEE
TI Thin Film Barium-Strontium-Titanate Parallel-plate Varactors Integrated
on Low-Resistivity Silicon and Saphhire Substrate
SO 2013 IEEE INTERNATIONAL SYMPOSIUM ON THE APPLICATIONS OF FERROELECTRIC
AND WORKSHOP ON THE PIEZORESPONSE FORCE MICROSCOPY (ISAF/PFM)
LA English
DT Proceedings Paper
CT IEEE International Symposium on the Applications of Ferroelectric /
Workshop on the Piezoresponse Force Microscopy (ISAF/PFM)
CY JUL 21-25, 2013
CL Prague, CZECH REPUBLIC
SP IEEE
DE coplanar waveguide; ferroelectric devices; low-resistivity silicon;
varactors
AB Barium-Strontium-Titanate (BST) thin film based ferroelectric varactors are designed at specific capacitances under 0V dc bias on CMOS compatible low-resistivity silicon substrate. The BST varactor device operation is based on the nonlinear dielectric tunability of BST thin film sandwiched between two metal plates in a revised conductor-backed coplanar waveguide (CBCPW) transmission line configuration. The varactor capacitance at 0V dc bias is determined by the overlap area between the CPW signal line in the top metal electrode and a tapered shunt line in the bottom electrode. Therefore a series of devices with unbiased capacitances ranging from 0.8pF to 4.8pF were designed and fabricated based on changing their corresponding overlap areas according to the generic parallel plate capacitance equation. A schematic model was also utilized to extract the designed and measured capacitances. The relationships between the sizes of overlap areas and the extracted capacitances from the electromagnetic and schematic models are demonstrated by a reasonable agreement with the experimental measurements from fabricated devices. Devices were also designed and fabricated on sapphire substrate with three layout variations aiming to modify the parasitic resistance.
C1 [Yue, Hailing; Brown, Dustin; Subramanyam, Guru] Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
[Leedy, Kevin; Cerny, Charles] US Air Force, Wright Patterson Res Lab, Sendors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Yue, HL (reprint author), Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
EM yueh01@udayton.edu
NR 9
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
PY 2013
BP 291
EP 294
PG 4
WC Engineering, Electrical & Electronic; Physics, Condensed Matter
SC Engineering; Physics
GA BA5MX
UT WOS:000336807100075
ER
PT S
AU LeMaster, DA
Mahamat, AH
Ratliff, BM
Alenin, AS
Tyo, JS
Koch, BM
AF LeMaster, Daniel A.
Mahamat, Adoum H.
Ratliff, Bradley M.
Alenin, Andrey S.
Tyo, J. Scott
Koch, Bradley M.
BE Shaw, JA
LeMaster, DA
TI SWIR active polarization imaging for material identification
SO POLARIZATION SCIENCE AND REMOTE SENSING VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Polarization Science and Remote Sensing VI
CY AUG 26-29, 2013
CL San Diego, CA
SP SPIE
DE Mueller matrix imaging; imaging polarimetry; material identification
ID TARGET CLASSIFICATION; OPTIMIZATION
AB Nighttime active SWIR imaging has resolution, size, weight, and power consumption advantages over passive MWIR and LWIR imagers for applications involving target identification. We propose that the target discrimination capability of active SWIR systems can be extended further by exerting polarization control over the illumination source and imager, i.e. through active polarization imaging. In this work, we construct a partial Mueller matrix imager and use laboratory derived signatures to uniquely identify target materials in outdoor scenes. This paper includes a description of the camera and laser systems as well as discussion of the reduction and analysis techniques used for material identification.
C1 [LeMaster, Daniel A.; Koch, Bradley M.] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Mahamat, Adoum H.; Alenin, Andrey S.; Tyo, J. Scott] Univ Arizona, Coll Opt Sci, Tucson, AZ USA.
[Ratliff, Bradley M.] Space Comp Corp, Beavercreek, OH USA.
RP LeMaster, DA (reprint author), US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM daniel.lemaster@us.af.mil
FU AFRL/RY Entrepreneurial Research Fund (ERF) program
FX This project was partially funded by the AFRL/RY Entrepreneurial
Research Fund (ERF) program.
NR 16
TC 1
Z9 1
U1 0
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9723-9
J9 PROC SPIE
PY 2013
VL 8873
AR UNSP 88730O
DI 10.1117/12.2023351
PG 8
WC Remote Sensing; Optics
SC Remote Sensing; Optics
GA BA5MT
UT WOS:000336801500020
ER
PT S
AU Wang, DH
Fillery, SP
Durstock, MF
Dai, LM
Vaia, RA
Tan, LS
AF Wang, David H.
Fillery, Scott P.
Durstock, Michael F.
Dai, Liming
Vaia, Richard A.
Tan, Loon-Seng
BE Yu, L
Guo, WP
Sun, M
He, J
TI Nanodiamond/Polyimide High Temperature Dielectric Films for Energy
Storage Applications
SO CURRENT TRENDS IN THE DEVELOPMENT OF INDUSTRY, PTS 1 AND 2
SE Advanced Materials Research
LA English
DT Proceedings Paper
CT 3rd International Conference on Chemical Engineering and Advanced
Materials (CEAM 2013)
CY JUL 06-07, 2013
CL Guangzhou, PEOPLES R CHINA
SP Guangdong Univ Technol, Guangdong Petrochem Res Inst, Guangzhou Univ
DE Polyimides; Nanodiamond; Energy Storage
AB CP2 polyimide (prepd. from 6FDA and 1,3-bis(3-aminophenoxy)benzene) was blended with (1-50 wt.%) detonation nanodiamonds (DND, pristine, acetone-washed, and 4-(2,4,6-trimethylphenoxy)benzoic acid-functionalized), and the blends were evaluated as thin films for its potential utility in high-energy-density capacitors that would have stable dielectric properties over a wide temperature range (-55 to 300 degrees C) and at frequencies up to or greater than 100 kHz. Both the dielectric storage and loss increased substantially with DND content. Surface functionalization (with the above benzoic acid derivative) significantly reduced the dielectric loss, while the use of acetone-washed DNDs had no effect on the dielectric loss. DND was also blended with CP2 via in-situ polymerization and found to have little effect on the dielectric properties.
C1 [Wang, David H.; Fillery, Scott P.; Durstock, Michael F.; Vaia, Richard A.; Tan, Loon-Seng] US Air Force, Res Lab, Mat & Mfg Directorate, Soft Matter Mat Branch AFRL RXAS, Wright Patterson AFB, OH 45433 USA.
RP Wang, DH (reprint author), US Air Force, Res Lab, Mat & Mfg Directorate, Soft Matter Mat Branch AFRL RXAS, Wright Patterson AFB, OH 45433 USA.
EM loon-seng.tan@wpafb.af.mil
RI Tan, Loon-Seng/F-6985-2012
OI Tan, Loon-Seng/0000-0002-2134-9290
NR 11
TC 1
Z9 1
U1 1
U2 4
PU TRANS TECH PUBLICATIONS LTD
PI STAFA-ZURICH
PA LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND
SN 1022-6680
BN 978-3-03785-814-1
J9 ADV MATER RES-SWITZ
PY 2013
VL 785-786
BP 410
EP 416
DI 10.4028/www.scientific.net/AMR.785-786.410
PG 7
WC Engineering, Industrial; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA BA4MV
UT WOS:000336005700077
ER
PT J
AU Prabhakaran, VS
Sanyal, AK
Leve, F
McClamroch, NH
AF Prabhakaran, V. Sasi
Sanyal, Amit K.
Leve, Frederick
McClamroch, N. Harris
GP ASME
TI GEOMETRIC MECHANICS BASED MODELING OF THE ATTITUDE DYNAMICS AND CONTROL
OF SPACECRAFT WITH VARIABLE SPEED CONTROL MOMENT GYROSCOPES
SO PROCEEDINGS OF THE ASME 2013 DYNAMIC SYSTEMS AND CONTROL CONFERENCE
(DSCC2013), VOL. 1
LA English
DT Proceedings Paper
CT ASME Dynamic Systems and Control Conference (DSCC)
CY OCT 21-23, 2013
CL Palo Alto, CA
SP ASME, Dynam Syst & Control Div
ID RIGID-BODY; STABILIZATION; SYSTEMS
AB The attitude dynamics of a spacecraft with a variable speed control moment gyroscope (VSCMG), in the presence of external torques and internal inputs, is derived using variational principles. A complete dynamics model, that relaxes some of the assumptions made in prior literature on control moment gyroscopes, is obtained. A non-standard VSCMG model, that has an offset between the center of the gimbal axis and the center of the rotor (flywheel) is considered. The dynamics equations show the complex nonlinear coupling between the internal degrees of freedom associated with the VSCMG and the spacecraft base body's attitude degrees of freedom. Some of this coupling is induced by the non-zero offset between the gimbal axis and the rotor center. This dynamics model is then generalized to include the effects of multiple control moment gyroscopes placed in the base body with non-parallel gimbal axes. It is shown that the dynamical coupling can improve the control authority on the angular momentum of the base body of the spacecraft using changes in the momentum variables of the VSCMG. Numerical simulations confirm the use of these VSCMGs for attitude control for a given de-tumbling maneuver.
C1 [Prabhakaran, V. Sasi; Sanyal, Amit K.] New Mexico State Univ, Mech & Aerosp Engn, Las Cruces, NM 88001 USA.
[Leve, Frederick] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
[McClamroch, N. Harris] Univ Michigan, Aerosp Engn, Ann Arbor, MI 48109 USA.
RP Sanyal, AK (reprint author), New Mexico State Univ, Mech & Aerosp Engn, Las Cruces, NM 88001 USA.
EM sashi@nmsu.edu; asanyal@nmsu.edu; afrl.rvsv@kirtland.af.mil;
nhm@engin.umich.edu
NR 32
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5612-3
PY 2013
PG 10
WC Automation & Control Systems; Engineering, Mechanical
SC Automation & Control Systems; Engineering
GA BA4CY
UT WOS:000335377800010
ER
PT S
AU Rohrbaugh, JP
AF Rohrbaugh, John P.
GP IEEE
TI Shield Transfer Impedance Model of a Multi-Branched Braid Shielded Cable
Harness
SO 2013 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)
SE IEEE International Symposium on Electromagnetic Compatibility
LA English
DT Proceedings Paper
CT IEEE International Symposium on Electromagnetic Compatibility (EMC)
CY AUG 05-09, 2013
CL Denver, CO
SP IEEE, Adv Test Equipment Rentals, ANDRO, ETS LINDGREN, FEKO, Gauss Instruments, Infield Sci Inc, Retlif Testing Labs, CCPIT Gen Ind Sub Council, ECN, EMV Europe, ENR, Evaluat Engn, In Compliance, ITEM Media, Microwave Journal, Safety & EMC China, Webcom Commun, Wireless Design & Dev
AB This paper presents a method of modeling shield transfer impedance (STI) of a multi-branched shielded cable harness. The model is based on information found in Vance [1]. The modeling method can be used to assess the impacts of defects, such as holes in the cable over-braid shield, and to evaluate the ability to locate defects by varying shield current drive conditions in a realistic manner. The model is implemented using MATLAB [2] and Micro-Cap [3] SPICE simulation codes.
C1 Northrop Grumman Tech Serv, Hill AFB, UT 84056 USA.
RP Rohrbaugh, JP (reprint author), Northrop Grumman Tech Serv, 6006 Wardleigh Rd, Hill AFB, UT 84056 USA.
EM john.rohrbaugh@ngc.com
NR 7
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2158-110X
BN 978-1-4799-0409-9; 978-1-4799-0408-2
J9 IEEE INT SYMP ELEC
PY 2013
BP 271
EP 276
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BA3WJ
UT WOS:000334998800052
ER
PT B
AU Flores, A
Pulford, B
Robin, C
Lu, CA
Shay, TM
AF Flores, Angel
Pulford, Benjamin
Robin, Craig
Lu, Chunte A.
Shay, Thomas M.
BE Brignon, A
TI Coherent Beam Combining of Fiber Amplifiers via LOCSET
SO COHERENT LASER BEAM COMBINING
LA English
DT Article; Book Chapter
ID BRILLOUIN-SCATTERING; SINGLE-MODE; PHASE; LASERS; ARRAY; COMBINATION;
KW; PROPAGATION; WAVE
C1 [Flores, Angel; Pulford, Benjamin; Robin, Craig; Lu, Chunte A.; Shay, Thomas M.] Air Force Res Lab, Directed Energy Directorate, Albuquerque, NM 87117 USA.
RP Flores, A (reprint author), Air Force Res Lab, Directed Energy Directorate, Albuquerque, NM 87117 USA.
NR 47
TC 1
Z9 1
U1 0
U2 1
PU BLACKWELL SCIENCE PUBL
PI OXFORD
PA OSNEY MEAD, OXFORD OX2 0EL, ENGLAND
BN 978-3-527-65280-8; 978-3-527-41150-4
PY 2013
BP 45
EP 73
D2 10.1002/9783527652778
PG 29
WC Physics, Applied
SC Physics
GA BA1JQ
UT WOS:000332649500003
ER
PT J
AU Meghanathan, N
Mumford, PD
AF Meghanathan, Natarajan
Mumford, Philip D.
BE Latifi, S
TI A Benchmarking Algorithm to Determine Maximum Stability Data Gathering
Trees for Wireless Mobile Sensor Networks
SO PROCEEDINGS OF THE 2013 10TH INTERNATIONAL CONFERENCE ON INFORMATION
TECHNOLOGY: NEW GENERATIONS
LA English
DT Proceedings Paper
CT 10th International Conference on Information Technology - New
Generations (ITNG)
CY APR 15-17, 2013
CL Las Vegas, NV
SP Premier Hall Sci & Engn
DE Maximum Stability; Data Gathering Trees; Mobile Sensor Networks; Tree
Lifetime; Algorithms; Simulations
AB The high-level contribution of this paper is the design of a benchmarking algorithm to determine a sequence of the longest-living stable data gathering trees for wireless mobile sensor networks (MSNs) such that the number of tree discoveries is the theoretical global minimum. Referred to as the Max. Stability-DG algorithm, the algorithm assumes the availability of the complete knowledge of future topology changes, and operates according to a greedy strategy: Whenever a new data gathering tree is needed at time instant t, determine a spanning tree that will exist for the longest time since t and derive a data gathering tree by conducting a Breadth First Search on the spanning tree. We prove the correctness of the Max.Stability-DG algorithm that it indeed determines the sequence of longest-living stable data gathering trees. Since the Max. Stability-DG trees are based on spanning trees covering the entire network of live sensor nodes, the average lifetime and the number of tree discoveries incurred for the Max. Stability-DG trees will serve respectively as the upper bound and lower bound for any network-wide communication topology determined using any other algorithm for mobile sensor networks.
C1 [Meghanathan, Natarajan] Jackson State Univ, Dept Comp Sci, Jackson, MS 39217 USA.
[Mumford, Philip D.] US Air Force, Res Lab, RYWC, Wright Patterson AFB, OH USA.
RP Meghanathan, N (reprint author), Jackson State Univ, Dept Comp Sci, Jackson, MS 39217 USA.
EM natarajan.meghanathan@jsums.edu; Philip.Mumford@wpafb.af.mil
FU U. S. Air Force Office of Scientific Research (AFOSR) through the Summer
Faculty Fellowship Program for the lead author (Natarajan Meghanathan)
FX This research was sponsored by the U. S. Air Force Office of Scientific
Research (AFOSR) through the Summer Faculty Fellowship Program for the
lead author (Natarajan Meghanathan) in June-July 2012. The research was
conducted under the supervision of the co-author (Philip D. Mumford) at
the U. S. Air Force Research Lab (AFRL), Wright-Patterson Air Force Base
(WPAFB) Dayton, OH. The AFRL public release number for this article is
PA Approval Number: 88ABW-2012-4781. The views and conclusions in this
document are those of the authors and should not be interpreted as
representing the official policies, either expressed or implied, of the
Air Force Research Laboratory or the U.S. Government. The U. S.
Government is authorized to reproduce and distribute reprints for
Government purposes notwithstanding any copyright notation herein
NR 14
TC 0
Z9 0
U1 0
U2 0
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
BN 978-0-7695-4967-5
PY 2013
BP 492
EP 497
DI 10.1109/ITNG.2013.83
PG 6
WC Computer Science, Information Systems
SC Computer Science
GA BA3VI
UT WOS:000334926900076
ER
PT S
AU Beran, P
Stanford, B
AF Beran, Philip
Stanford, Bret
BE Bijl, H
Lucor, D
Mishra, S
Schwab, C
TI Uncertainty Quantification in Aeroelasticity
SO UNCERTAINTY QUANTIFICATION IN COMPUTATIONAL FLUID DYNAMICS
SE Lecture Notes in Computational Science and Engineering
LA English
DT Article; Book Chapter
ID AIRFOIL FLUTTER; OPTIMIZATION; OSCILLATIONS; BOUNDARIES; PLATE
AB It is important to account for uncertainties in aeroelastic response when designing and certifying aircraft. However, aeroelastic uncertainties are particularly challenging to quantify, since dynamic stability is a binary property (stable or unstable) that may be sensitive to small variations in system parameters. To correctly discern stability, the interactions between fluid and structure must be accurately captured. Such interactions involve an energy flow through the interface, which if unbalanced, can destablize the structure. With conventional computational techniques, the consequences of imbalance may require large simulation times to discern, and evaluating the dependence of stability on numerous system parameters can become intractable. In this chapter, the challenges in quantifying aeroelastic uncertainties will be explored and numerical methods will be described to decrease the difficulty of quantifying aeroelastic uncertainties and increase the reliability of aircraft structures subjected to airloads. A series of aeroelastic analyses and reliability studies will be carried out to illustrate key concepts.
C1 [Beran, Philip] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Stanford, Bret] Universal Technol Corp, Wright Patterson AFB, OH 45433 USA.
RP Beran, P (reprint author), Air Force Res Lab, 2210 Eighth St, Wright Patterson AFB, OH 45433 USA.
EM philip.beran@wpafb.af.mil; bretkennedystanford@gmail.com
NR 44
TC 1
Z9 1
U1 2
U2 5
PU SPRINGER-VERLAG BERLIN
PI BERLIN
PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY
SN 1439-7358
BN 978-3-319-00885-1; 978-3-319-00884-4
J9 LECT NOTES COMP SCI
PY 2013
VL 92
BP 59
EP 103
DI 10.1007/978-3-319-00885-1_2
D2 10.1007/978-3-319-00885-1
PG 45
WC Mechanics; Physics, Fluids & Plasmas
SC Mechanics; Physics
GA BA1II
UT WOS:000332623300003
ER
PT J
AU Atahary, T
Taha, TM
Douglass, S
AF Atahary, Tanvir
Taha, Tarek M.
Douglass, Scott
BE Takahashi, S
Leo, R
TI Hardware Accelerated Cognitively Enhanced Complex Event Processing
Architecture
SO 2013 14TH ACIS INTERNATIONAL CONFERENCE ON SOFTWARE ENGINEERING,
ARTIFICIAL INTELLIGENCE, NETWORKING AND PARALLEL/DISTRIBUTED COMPUTING
(SNPD 2013)
LA English
DT Proceedings Paper
CT 14th ACIS International Conference on Software Engineering, Artificial
Intelligence, Networking and Parallel/Distributed Computing (SNPD)
CY JUL 01-03, 2013
CL Honolulu, HI
SP IEEE, IEEE Comp Soc, Int Assoc Comp & Informat Sci, Cent Michigan Univ, Software Engn & Informat Technol Inst
DE Agent based decision aides; knowledge mining; parallelization;
multicore; GPGPU
AB Agent-based decision aids can improve their performance by mining domain knowledge captured in cognitive domain ontologies (CDOs). This paper introduces a cognitively enhanced complex event processing (CECEP) architecture to enable enhanced agent-based decision making. Additionally the paper examines the parallelization and acceleration of a key knowledge mining process within the architecture on high performance computing platforms. Speedups of almost a 1000 times were seen using 8 NVIDIA Tesla C2070 GPGPUs over 1 Xeon X5650 processor core. Speedups of this level will allow more complex knowledge domains to be searched in real time on reactive agents and thus enable systems with enhanced intelligence to be designed.
C1 [Atahary, Tanvir; Taha, Tarek M.] Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
[Douglass, Scott] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Atahary, T (reprint author), Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
EM ataharyt1@udayton.edu; tarek.taha@udayton.edu;
scott.douglass@wpafb.af.mil
FU US Air Force Research Laboratory; Air Force Office of Scientific
Research
FX This work was sponsored by the US Air Force Research Laboratory and the
Air Force Office of Scientific Research.
NR 33
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-0-7695-5005-3
PY 2013
BP 283
EP 288
DI 10.1109/SNPD.2013.57
PG 6
WC Computer Science, Artificial Intelligence; Computer Science, Software
Engineering; Computer Science, Theory & Methods; Engineering, Electrical
& Electronic
SC Computer Science; Engineering
GA BA2TK
UT WOS:000333893400042
ER
PT S
AU Tomasic, B
Champion, M
AF Tomasic, Boris
Champion, Michelle
GP IEEE Antennas & Propagat Soc
TI Analysis of Sparse Trifilar Array Antenna
SO 2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT International Symposium of the IEEE-Antennas-and-Propagation-Society
CY JUL 07-13, 2013
CL Orlando, FL
SP Inst Elect & Elect Engineers, IEEE Antennas & Propagat Soc, APS
AB A sparse trifilar antenna can support two independent beams while, to reduce the interference between the beams, each array element supports only one beam. To minimize the grating lobe effects each beam is formed by three spiral arms resulting in a sparse random array arrangement. In this paper we investigate the impedance and radiation characteristics of such an array. We have shown that the active reflection coefficients are somewhat degraded in comparison to a fully populated array, however the directivity remains approximately the same, making the trifilar array a viable solution for multi-frequency, multi-beam communication applications.
C1 [Tomasic, Boris; Champion, Michelle] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Tomasic, B (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM boris.tomasic@wpafb.af.mil; michelle.champion@wpafb.af.mil
NR 2
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-5317-5
J9 IEEE ANTENNAS PROP
PY 2013
BP 99
EP 100
PG 2
WC Telecommunications
SC Telecommunications
GA BA1OQ
UT WOS:000332766800050
ER
PT S
AU Herscovici, N
Champion, M
Borrisenko, A
AF Herscovici, Naftali
Champion, Michelle
Borrisenko, Anatoliy
GP IEEE Antennas & Propagat Soc
TI A New Omnidirectional Shaped Beam Antenna
SO 2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT International Symposium of the IEEE-Antennas-and-Propagation-Society
CY JUL 07-13, 2013
CL Orlando, FL
SP Inst Elect & Elect Engineers, IEEE Antennas & Propagat Soc, APS
AB A new type of antenna, the omnidirectional polyrod shaped beam antenna with a shaped-beam radiation pattern in elevation is presented. It is based on the typical polyrod antenna, which can have a shaped beam realized by the appropriate physical shaping of the radiating polyrod. The antenna can be used as an airborne omnidirectional radiator with a requested sectoral coverage.
C1 [Herscovici, Naftali; Champion, Michelle] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Herscovici, N (reprint author), US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM naftali.herscovici@wpafb.af.mil; michelle.champion@wpafb.af.mil;
anatoliy@ae-partnership.com
NR 6
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-5317-5
J9 IEEE ANTENNAS PROP
PY 2013
BP 244
EP 245
PG 2
WC Telecommunications
SC Telecommunications
GA BA1OQ
UT WOS:000332766800120
ER
PT S
AU Adomanis, BM
Burckel, DB
Marciniak, MA
AF Adomanis, Bryan M.
Burckel, D. Bruce
Marciniak, Michael A.
BE Boardman, AD
Engheta, N
Noginov, MA
Zheludev, NI
TI A characterization study of highly-tailorable 3-D metamaterials in the
thermal infrared for selective emission behaviors
SO METAMATERIALS: FUNDAMENTALS AND APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Metamaterials - Fundamentals and Applications VI
CY AUG 25-29, 2013
CL San Diego, CA
SP SPIE
DE Infrared; Metamaterials; Selective Emission; Characterization; Membrane
Projection Lithography
ID MEMBRANE PROJECTION LITHOGRAPHY; RADIATION
AB The spectral behaviors of an externally-illuminated thermal infrared metamaterial were characterized through simulation and experimental measurement of the power transmittance and reflectance within the 6 - 20 mu m range. Finite-difference time domain (FDTD) simulations in both 2-D and 3-D environments were swept over a multitude of bent dipole inclusion configurations at normal incidence angles to produce a model which exhibited a dominant electrical resonance in the long-wave infrared (IR) and increased in magnitude, bandwidth and wavelength as a function of the dipole length. Despite the appearance of fabrication defects in the measured samples, it was found the experimental data was in good agreement with the 3-D FDTD simulations, though not at all with the 2-D simulations. These introductory results indicate the dipole inclusion may behave in many ways similar to an antenna in the IR, enabling spectrally- and spatially-selective control of the emission pattern.
C1 [Adomanis, Bryan M.; Marciniak, Michael A.] Air Force Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Adomanis, Bryan M.] US Air Force, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Burckel, D. Bruce] Sandia Natl Labs, Mexico City, DF 81785, Mexico.
RP Adomanis, BM (reprint author), Air Force Inst Technol, Wright Patterson AFB, OH 45433 USA.
OI Marciniak, Michael/0000-0003-2879-5565
NR 26
TC 0
Z9 0
U1 0
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9656-0
J9 PROC SPIE
PY 2013
VL 8806
AR UNSP 880610
DI 10.1117/12.2024551
PG 13
WC Materials Science, Multidisciplinary; Optics; Physics, Applied
SC Materials Science; Optics; Physics
GA BA2UY
UT WOS:000333925200006
ER
PT S
AU Allen, KW
Kosolapov, AF
Kolyadin, AN
Pryamikov, AD
Mojaverian, N
Limberopoulos, NI
Astratov, VN
AF Allen, Kenneth W.
Kosolapov, Alexey F.
Kolyadin, Anton N.
Pryamikov, Andrey D.
Mojaverian, Neda
Limberopoulos, Nicholaos I.
Astratov, Vasily N.
GP IEEE
TI Photonic Jets Produced by Microspheres Integrated with Hollow-Core
Fibers for Ultraprecise Laser Surgery
SO 2013 15TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS
(ICTON 2013)
SE International Conference on Transparent Optical Networks-ICTON
LA English
DT Proceedings Paper
CT 15th International Conference on Transparent Optical Networks (ICTON)
CY JUN 23-27, 2013
CL Cartagena, SPAIN
SP Univ Politecnica Cartagena, IEEE, IEEE Photon Soc, Natl Inst Telecommunicat, Inst Lacznosci, Escuela Tecnica Super Ingn Telecomunicac
DE laser tissue surgery; Er:YAG laser; hollow-core fibers; microsphere;
light focusing; photonic nanojet
ID CRYSTAL FIBER; NANOJETS
AB Recently it was proposed to use sharply focused optical beams produced by dielectric microspheres, also termed "photonic nanojets", in contact laser surgery applications. The proposed designs were based on using multimodal beams and suffered from limited efficiency. In this work we developed single-mode designs of such devices providing higher efficiency and significantly smaller focal spot sizes compared to multimodal systems. The proposed single-mode systems include: i) diode-pumped Er:YAG laser source operating at the wavelength corresponding to the maximal water absorption peak in the tissue (lambda = 2.94 mu m), ii) low-loss hollow-core microstructured fiber delivery, and iii) high-index (n similar to 1.8) focusing barium-titanate glass microsphere integrated with the fiber. By testing the system in air we demonstrated the focal spot diameters to be less than 4 lambda. Our numerical modeling shows a principal possibility to achieve diffraction-limited spot sizes on the order of lambda/2. Due to the fact that the location of the photonic jet at the sphere surface is not strongly affected by the presence of fluid such systems can find applications in ultraprecise contact intraocular, brain or cellular microsurgeries.
C1 [Allen, Kenneth W.; Astratov, Vasily N.] Univ N Carolina, Dept Phys & Opt Sci, Ctr Optoelect & Opt Commun, 9201 Univ City Blvd, Charlotte, NC 28223 USA.
[Kosolapov, Alexey F.; Kolyadin, Anton N.; Pryamikov, Andrey D.] Russian Acad Sci, Fiber Opt Res Ctr, Moscow 119333, Russia.
[Mojaverian, Neda; Limberopoulos, Nicholaos I.; Astratov, Vasily N.] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Allen, KW (reprint author), Univ N Carolina, Dept Phys & Opt Sci, Ctr Optoelect & Opt Commun, 9201 Univ City Blvd, Charlotte, NC 28223 USA.
EM kallen62@uncc.edu; astratov@uncc.edu
FU U.S. Army Research Office (ARO) [W911NF-09-1-0450]; National Science
Foundation (NSF) [ECCS-0824067]; Air Force Research Laboratory
(AFRL/RYD) through the AMMTIAC; Alion Science and Technology
FX The authors thank A. Urbas, I. Vitebskiy, T. Nelson, and M. Schmitt for
stimulating discussions. This work was supported by the U.S. Army
Research Office (ARO) through Dr. J. T. Prater under Contract No.
W911NF-09-1-0450 and from the National Science Foundation (NSF) under
grant ECCS-0824067. Also, this work was sponsored by the Air Force
Research Laboratory (AFRL/RYD) through the AMMTIAC contract with Alion
Science and Technology.
NR 18
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2162-7339
BN 978-1-4799-0683-3
J9 INT C TRANS OPT NETW
PY 2013
PG 4
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BA1YR
UT WOS:000333178300235
ER
PT S
AU Darafsheh, A
Limberopoulos, NI
Derov, JS
Walker, DE
Astratov, VN
AF Darafsheh, Arash
Limberopoulos, Nicholaos I.
Derov, John S.
Walker, Dennis E., Jr.
Astratov, Vasily N.
GP IEEE
TI Comparison between Microsphere-Assisted and Confocal Microscopies
SO 2013 15TH INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS
(ICTON 2013)
SE International Conference on Transparent Optical Networks-ICTON
LA English
DT Proceedings Paper
CT 15th International Conference on Transparent Optical Networks (ICTON)
CY JUN 23-27, 2013
CL Cartagena, SPAIN
SP Univ Politecnica Cartagena, IEEE, IEEE Photon Soc, Natl Inst Telecommunicat, Inst Lacznosci, Escuela Tecnica Super Ingn Telecomunicac
DE Super-resolution; subdiffraction resolution; imaging; microscopy;
confocal; photonic nanojet
ID PHOTONIC NANOJETS; BACKSCATTERING; NANOPARTICLES; FUNDAMENTALS; LIGHT;
LENS
AB We show that microsphere-assisted microscopy, where liquid-immersed barium titanate glass (n similar to 1.9) beads with diameters of several microns are employed, has superior optical resolution compared to the confocal microscopy. The resolution advantage of microsphere-assisted microscopy stems from an ability of high-index microspheres to pick spatial distribution of optical near-fields produced by the plasmonic nanostructure used in our experiments. It is shown that an additional advantage of imaging through liquid-immersed microspheres is the ability to achieve high resolution imaging using microscope objectives with moderate numerical apertures. This means that microsphere-assisted microscopy can be performed with longer working distances compared to conventional or confocal microscopy. Super-resolution microscopy by using liquid-immersed microspheres can be potentially used in biomedical microscopy, microfluidics, and nanophotonics applications.
C1 [Darafsheh, Arash; Astratov, Vasily N.] Univ N Carolina, Dept Phys & Opt Sci, Ctr Optoelect & Opt Commun, 9201 Univ City Blvd, Charlotte, NC 28223 USA.
[Limberopoulos, Nicholaos I.; Derov, John S.; Walker, Dennis E., Jr.; Astratov, Vasily N.] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Darafsheh, A (reprint author), Univ N Carolina, Dept Phys & Opt Sci, Ctr Optoelect & Opt Commun, 9201 Univ City Blvd, Charlotte, NC 28223 USA.
EM adarafs1@uncc.edu; astratov@uncc.edu
FU U.S. Army Research Office (ARO) [W911NF-09-1-0450]; National Science
Foundation (NSF) [ECCS-0824067]; Air Force Research Laboratory
(AFRL/RYD) through AMMTIAC; Alion Science and Technology
FX The authors thank A. Urbas, I. Vitebskiy, T. Nelson, and M. Schmitt for
stimulating discussions. This work was supported by the U.S. Army
Research Office (ARO) through Dr. J. T. Prater under Contract No.
W911NF-09-1-0450 and from the National Science Foundation (NSF) under
grant ECCS-0824067. Also, this work was sponsored by the Air Force
Research Laboratory (AFRL/RYD) through the AMMTIAC contract with Alion
Science and Technology.
NR 20
TC 0
Z9 0
U1 2
U2 9
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2162-7339
BN 978-1-4799-0683-3
J9 INT C TRANS OPT NETW
PY 2013
PG 4
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BA1YR
UT WOS:000333178300236
ER
PT S
AU Garcia, E
Antsaklis, PJ
AF Garcia, Eloy
Antsaklis, Panos J.
BE Antsaklis, P
Valavanis, K
Tsourveloudis, N
Zingaretti, P
Moreno, L
TI Model-Based Control of Continuous-Time Systems with Limited Intermittent
Feedback.
SO 2013 21ST MEDITERRANEAN CONFERENCE ON CONTROL AND AUTOMATION (MED)
SE Mediterranean Conference on Control and Automation
LA English
DT Proceedings Paper
CT 21st Mediterranean Conference on Control and Automation (MED)
CY JUN 25-28, 2013
CL Platanias, GREECE
SP Mediterranean Control Assoc, IEEE Control Syst Soc, IEEE Robot & Automat Soc, Tech Univ Crete, Univ Denver, IEEE
ID NETWORKED CONTROL-SYSTEMS; LINEAR-SYSTEMS; STABILIZATION; STATE
AB This paper presents a practical alternative for the implementation of Model-Based Networked Control Systems (MB-NCS) with intermittent feedback. Our approach does not require continuous communication over a limited bandwidth channel during the closed-loop time intervals; instead, we propose a communication format that implements a fast rate for updating the state of the model. During the closed-loop interval the sensor transmits measurements at a fast rate but without assuming continuous communication. We consider uncertain continuous-time systems and study the state feedback and output feedback cases. For both cases, we provide necessary and sufficient conditions for stability as a function of the update periods.
C1 [Garcia, Eloy] Air Force Res Lab, Control Sci Ctr Excellence, Wright Patterson AFB, OH 45433 USA.
[Antsaklis, Panos J.] Univ Notre Dame, Dept Elect Engn, Notre Dame, IN 46556 USA.
RP Garcia, E (reprint author), Air Force Res Lab, Control Sci Ctr Excellence, Wright Patterson AFB, OH 45433 USA.
EM elgarcia@infoscitex.com
NR 18
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2325-369X
BN 978-1-4799-0995-7; 978-1-4799-0997-1
J9 MED C CONTR AUTOMAT
PY 2013
BP 452
EP 457
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BA2BG
UT WOS:000333245100073
ER
PT S
AU Yoder, SM
Balasubramanian, S
Khalil, W
Patel, VJ
AF Yoder, Samantha M.
Balasubramanian, Sidharth
Khalil, Waleed
Patel, Vipul J.
BE Carletta, J
Geiger, RL
TI Accuracy and Speed Limitations in DACs across CMOS process Technologies
SO 2013 IEEE 56TH INTERNATIONAL MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS
(MWSCAS)
SE Midwest Symposium on Circuits and Systems Conference Proceedings
LA English
DT Proceedings Paper
CT IEEE 56th International Midwest Symposium on Circuits and Systems
(MWSCAS)
CY AUG 04-07, 2013
CL Ohio State Univ, Ohio Union, Columbus, OH
SP IEEE, IEEE Circuits & Syst Soc, Univ Cincinnati, Khalifa Univ
HO Ohio State Univ, Ohio Union
AB We present a study of accuracy and timing limitations in current-steering digital-to-analog converters (DACs). Effects of limited output impedance and device mismatches on the DAC performance are discussed and observed for a 10-bit DAC operating at GS/s. These limitations are also studied across 180, 90, and 65 nm CMOS process technologies.
C1 [Yoder, Samantha M.; Balasubramanian, Sidharth; Khalil, Waleed] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
[Patel, Vipul J.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Yoder, SM (reprint author), Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
NR 9
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1548-3746
BN 978-1-4799-0066-4
J9 MIDWEST SYMP CIRCUIT
PY 2013
BP 868
EP 871
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BA1YQ
UT WOS:000333176800218
ER
PT B
AU Kolonay, RM
AF Kolonay, Raymond M.
BE Bil, C
Mo, J
Stjepandic, J
TI Physics-Based Distributed Collaborative Design for Aerospace Vehicle
Development and Technology Assessment
SO 20TH ISPE INTERNATIONAL CONFERENCE ON CONCURRENT ENGINEERING
LA English
DT Proceedings Paper
CT 20th ISPE International Conference on Concurrent Engineering
CY SEP 02-06, 2013
CL Melbourne, AUSTRALIA
SP Int Soc Prod Enhancement
DE multidisciplinary design optimization; collaborative design; network
computing; physics-based design; Service ORiented Computing EnviRonment
(SORCER)
AB One of the missions of the United States Air Force Research Lab (AFRL) is to develop and assess technologies for next generation aerospace systems. Currently, the assessment is achieved using empirical relationships and historical data associated with systems developed previously. The assessment is done in this fashion due to resource constraints on time, personnel, and funding. Performing technology assessment in such a fashion, although timely, is not necessarily accurate. This is due to the fact that many of the technologies and system configurations being evaluated have no historical or empirical information associated with them. Hence, traditional assessment techniques produce misleading results and subsequently ill-informed decisions by Air Force leadership associated with technology investment and potential future system capabilities. To address this issue the Multidisciplinary Science and Technology Center within AFRL's Aerospace Systems Directorate is developing physics-based design exploration and technology assessment methods and processes. The new methods and processes utilize physics-based analyses and a distributed collaborative computational environment to predict vehicle performance which in turn is used in mission level simulations to assess the impact of a given configuration or technology on the combat effectiveness of a system. The new methods and processes will be executable within the same time and resource constraints of the traditional process. This enables AFRL technology developers to have a quantifiable and traceable trail of the impact of their technologies on system performance parameters such as weight, lift, and drag into terms that Air Force leadership measures system effectiveness - lethality, survivability, sustainability, and affordability. This leads to well informed decisions concerning technology investment and achievable capabilities.
C1 US AF Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Kolonay, RM (reprint author), US AF Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 24
TC 0
Z9 0
U1 1
U2 5
PU IOS PRESS
PI AMSTERDAM
PA NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS
BN 978-1-61499-302-5; 978-1-61499-301-8
PY 2013
BP 198
EP 215
DI 10.3233/978-1-61499-302-5-198
PG 18
WC Engineering, Manufacturing; Operations Research & Management Science
SC Engineering; Operations Research & Management Science
GA BA2CB
UT WOS:000333272000022
ER
PT B
AU Sobolewski, M
Burton, S
Kolonay, R
AF Sobolewski, Michael
Burton, Scott
Kolonay, Raymond
BE Bil, C
Mo, J
Stjepandic, J
TI Parametric Mogramming with Var- oriented Modeling and Exertion-Oriented
Programming Languages
SO 20TH ISPE INTERNATIONAL CONFERENCE ON CONCURRENT ENGINEERING
LA English
DT Proceedings Paper
CT 20th ISPE International Conference on Concurrent Engineering
CY SEP 02-06, 2013
CL Melbourne, AUSTRALIA
SP Int Soc Prod Enhancement
DE transdisciplinary concurrent engineering; service-oriented mogramming;
var-oriented modeling; exertion-oriented programming; SOA; SORCER
AB The Service ORiented Computing EnviRonment (SORCER) targets service abstractions for transdisciplinary concurrent engineering with support for true service-oriented (SO) computing. SORCER's models are expressed in a top-down Var-oriented Modeling Language (VML) unified with programs in a bottom-up Exertion-Oriented Language (EOL). In this paper the basic concepts of mogramming are presented. On the one hand, modeling with service variables allows for computational fidelity within multiple types of evaluations. On the other hand, any combination of local and remote services can be described in EOL as a collaborative federation of engineering applications, tools, and utilities. An example of aircraft conceptual design application is given to illustrate how parametric models can participate in service-oriented engineering analyses.
C1 [Sobolewski, Michael; Burton, Scott; Kolonay, Raymond] AF Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Sobolewski, M (reprint author), AF Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 11
TC 1
Z9 1
U1 1
U2 4
PU IOS PRESS
PI AMSTERDAM
PA NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS
BN 978-1-61499-302-5; 978-1-61499-301-8
PY 2013
BP 381
EP 390
DI 10.3233/978-1-61499-302-5-381
PG 10
WC Engineering, Manufacturing; Operations Research & Management Science
SC Engineering; Operations Research & Management Science
GA BA2CB
UT WOS:000333272000040
ER
PT J
AU Welker, TC
Pachter, M
Huffman, RE
AF Welker, Troy C.
Pachter, Meir
Huffman, Richard E., Jr.
GP IEEE
TI Gravity Gradiometer Integrated Inertial Navigation
SO 2013 EUROPEAN CONTROL CONFERENCE (ECC)
LA English
DT Proceedings Paper
CT European Control Conference (ECC)
CY JUL 17-19, 2013
CL ETH Zurich, Zurich, SWITZERLAND
SP European Control Assoc, IFAC, IEEE, CSS
HO ETH Zurich
AB In high precision inertial navigation, gravity field modeling error becomes a limiting factor. Granted that high precision accelerometers are used, airborne gravity gradiometry can be employed in a self-contained way to accurately estimate the gravity field on the fly and eliminate the gravity field modeling error. The local acceleration of gravity will be estimated using the onboard accelerometer measurements, provided that the acceleration measurements are very accurate, as is the case in high precision INS using cold atom interferometry-based accelerometers. An autonomous free-inertial gravity gradiometer integrated aircraft navigation system is promulgated.. e accurate mapping of the gravity field along the aircraft's flight path is an added benefit.
C1 [Welker, Troy C.; Huffman, Richard E., Jr.] US Air Force, Washington, DC USA.
RP Welker, TC (reprint author), US Air Force, Washington, DC USA.
EM meir.pachter@afit.edu
NR 17
TC 2
Z9 6
U1 1
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-3-033-03962-9
PY 2013
BP 846
EP 851
PG 6
WC Automation & Control Systems
SC Automation & Control Systems
GA BA1GM
UT WOS:000332509701039
ER
PT J
AU Pham, KD
Gubar, A
AF Pham, Khanh D.
Gubar, Alena
GP IEEE
TI A Class of Mean-Risk Decisions for Noncooperative Games and Distributed
Controls
SO 2013 EUROPEAN CONTROL CONFERENCE (ECC)
LA English
DT Proceedings Paper
CT European Control Conference (ECC)
CY JUL 17-19, 2013
CL ETH Zurich, Zurich, SWITZERLAND
SP European Control Assoc, IFAC, IEEE, CSS
HO ETH Zurich
ID DIFFERENTIAL-GAMES
AB The paper gives a comprehensive presentation of the broad and still developing area of risk-averse decision making in the stochastic linear-quadratic class of multiperson noncooperative differential games and/or distributed controls. The fundamental set of design principles is developed for self-directed decision makers, who are imitatively cautious and privately capable of incorporating summary performance-measure statistics into their distributed output-feedback Nash decision policies for competitive interactions and engagements.
C1 [Pham, Khanh D.] Space Vehicles Directorate, Air Force Res Lab, 3550 Aberdeen Ave,SE, Kirtland AFB, NM 87117 USA.
[Gubar, Alena] St Petersburg State Univ, Fac Math & Control Proc, St Petersburg 198504, Russia.
RP Pham, KD (reprint author), Space Vehicles Directorate, Air Force Res Lab, 3550 Aberdeen Ave,SE, Kirtland AFB, NM 87117 USA.
EM AFRL.RVSV@kirtland.af.mil; alyona.gubar@gmail.com
RI Gubar, Elena/J-3085-2013
OI Gubar, Elena/0000-0002-8970-1617
NR 11
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-3-033-03962-9
PY 2013
BP 4365
EP 4370
PG 6
WC Automation & Control Systems
SC Automation & Control Systems
GA BA1GM
UT WOS:000332509704128
ER
PT J
AU Epstein, RI
Sheik-Bahae, M
Melgaard, SD
Seletskiy, DV
Albrecht, AR
Ghasemkhani, M
AF Epstein, R. I.
Sheik-Bahae, M.
Melgaard, S. D.
Seletskiy, D. V.
Albrecht, A. R.
Ghasemkhani, M.
GP IEEE
TI Optical Cryocoolers
SO 2013 IEEE 14TH INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE
(ISEC)
LA English
DT Proceedings Paper
CT IEEE 14th International Superconductive Electronics Conference (ISEC)
CY JUL 07-11, 2013
CL Cambridge, MA
SP IEEE, IEEE Council Superconduct, Out Fog Res, Russian Quantum Ctr, ONR, Dept Navy
DE cryocooling; solid-state; anti-Stokes fluorescence; laser cooling
AB Optical refrigeration is a solid-state cooling technology that has already achieved working temperatures of 114 K and is expected to cool below 80 K in the near future. This approach to cooling generates no vibrations and is immune to magnetic or electromagnetic interference. Furthermore, the coolers can be much lighter and more compact than mechanical coolers. At the minimum temperatures, the heat lift is about 1% of the input power.
C1 [Epstein, R. I.] ThermoDynam Films LLC, Santa Fe, NM 87505 USA.
[Epstein, R. I.; Sheik-Bahae, M.; Melgaard, S. D.; Albrecht, A. R.; Ghasemkhani, M.] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA.
[Melgaard, S. D.] US Air Force, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Seletskiy, D. V.] Univ Konstanz, D-78457 Constance, Germany.
RP Epstein, RI (reprint author), ThermoDynam Films LLC, Santa Fe, NM 87505 USA.
NR 6
TC 0
Z9 0
U1 0
U2 3
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-6371-6
PY 2013
PG 3
WC Engineering, Electrical & Electronic
SC Engineering
GA BA2CG
UT WOS:000333277300010
ER
PT J
AU Morrow, CE
Bryan, CJ
Stephenson, JA
Bryan, AO
Haskell, J
Staal, M
AF Morrow, Chad E.
Bryan, Craig J.
Stephenson, James A.
Bryan, AnnaBelle O.
Haskell, Jeremy
Staal, Mark
TI Posttraumatic Stress, Depression, and Insomnia Among US Air Force
Pararescuemen
SO MILITARY PSYCHOLOGY
LA English
DT Article
DE military; PSTD; depression; insomnia; special forces
ID MENTAL-HEALTH PROBLEMS; ACTIVE-DUTY; GENDER-DIFFERENCES;
RESERVE-COMPONENT; SEVERITY INDEX; IRAQ WAR; MILITARY; COMBAT; SOLDIERS;
SYMPTOMS
AB Few studies have examined rates of mental health problems among special duty military personnel, who often have frequent deployments and high exposure to operational stressors and trauma. The current study examined the severity and rates of positive screening for posttraumatic stress, depression, and insomnia among 194 U. S. Air Force pararescuemen (PJs) in the active duty (AD) and National Guard/Reserve (NG/R) components. Overall estimated rates were 11.6% for probable posttraumatic stress disorder (PTSD), 1.6% for probable depression, and 16.1% for clinical insomnia. PJs in the NG/R reported significantly more severe posttraumatic stress symptoms (F(1, 162) = 10.031, p = .002, partial eta(2) = .058) and were approximately twice as likely to screen positive for probable PTSD (8.5% vs. 19.1%; chi(2)[1] = 3.679, p = .055). No differences in the rate or severity of depression or insomnia symptoms were found. Rates of positive screens are comparable to or lower than previously published rates among military personnel.
C1 [Morrow, Chad E.] Hurlburt Field, Mary Esther, FL USA.
[Bryan, Craig J.; Bryan, AnnaBelle O.] Natl Ctr Vet Studies, Salt Lake City, UT USA.
[Bryan, Craig J.] Univ Utah, Dept Psychol, Salt Lake City, UT 84105 USA.
[Stephenson, James A.] Maxwell AFB, Montgomery, AL USA.
[Bryan, AnnaBelle O.] Univ Utah, Dept Social & Behav Sci, Salt Lake City, UT 84105 USA.
[Haskell, Jeremy] Nellis AFB, Las Vegas, NV USA.
[Staal, Mark] Pope Army Air Field, Fayetteville, NC USA.
RP Bryan, CJ (reprint author), Univ Utah, Natl Ctr Vet Studies, 260 South Cent Campus Dr,Room 205, Salt Lake City, UT 84105 USA.
EM craig.bryan@utah.edu
OI Bryan, Craig/0000-0002-9714-0733
NR 36
TC 4
Z9 4
U1 1
U2 6
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0899-5605
EI 1532-7876
J9 MIL PSYCHOL
JI Milit. Psychol.
PY 2013
VL 25
IS 6
BP 568
EP 576
DI 10.1037/mil0000021
PG 9
WC Psychology, Multidisciplinary
SC Psychology
GA AD9MT
UT WOS:000333589900004
ER
PT J
AU Douglass, SA
AF Douglass, Scott A.
BE Rozenblit, JW
TI Autonomous Agents in Complex Event-Driven Software Systems
SO 2013 20TH ANNUAL IEEE INTERNATIONAL CONFERENCE AND WORKSHOPS ON THE
ENGINEERING OF COMPUTER BASED SYSTEMS (ECBS 2013)
LA English
DT Proceedings Paper
CT 20th Annual IEEE International Conference and Workshops on the
Engineering of Computer Based Systems (ECBS)
CY APR 22-24, 2013
CL Phoenix, AZ
SP IEEE, IEEE Comp Soc, Arizona State Univ, Ira A Fulton Sch Engn, Univ Arizona, Coll Engn, ECE, IEEE Tech Comm Engn Comp Based Syst
DE autonomous agents; meta-modeling; complex event processing; event-driven
software systems
AB AFRL cognitive scientists are struggling to develop cognitive process models that behave more like autonomous goal-pursuing agents than programs. Autonomous agents are difficult to develop because the broader system in which contingencies and effective actions mesh must be represented and processed by the agent. In complex and dynamic environments, it is virtually impossible to author a set of pre-defined rules capturing all the relationships between contingencies, constraints, and effective actions. For the last three years, an AFRL Large-Scale Cognitive Modeling (LSCM) research initiative has worked to develop new agent specification formalisms that decrease the importance of pre-defined rules. The initiative has also developed execution frameworks for these formalisms that reduce the difficulty of integrating autonomous agents into training and operational environments built upon complex event-driven software systems. During this address, I will describe how the LSCM initiative has used meta-modeling in the Generic Modeling Environment and agent execution in a "cognitively enhanced" complex event processing architecture to fundamentally change the way cognitive models and agents are conceived of, specified, and executed. The address will demonstrate how these changes help AFRL cognitive scientists specify autonomous agents and integrate them into complex event-driven software systems.
C1 Air Force Res Lab, Wright Patterson AFB, OH USA.
RP Douglass, SA (reprint author), Air Force Res Lab, 711 Human Performance Wing, Wright Patterson AFB, OH USA.
EM scott.douglass@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-0-7695-4991-0
PY 2013
BP 1
EP 1
DI 10.1109/ECBS.2013.35
PG 1
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BA1RQ
UT WOS:000332978600001
ER
PT J
AU Peng, W
Li, F
Han, KJ
Zou, XK
Wu, J
AF Peng, Wei
Li, Feng
Han, Keesook J.
Zou, Xukai
Wu, Jie
GP IEEE
TI T-dominance: Prioritized Defense Deployment for BYOD Security
SO 2013 IEEE CONFERENCE ON COMMUNICATIONS AND NETWORK SECURITY (CNS)
LA English
DT Proceedings Paper
CT 1st IEEE International Conference on Communications and Network Security
(CNS)
CY OCT 14-16, 2013
CL Washington, DC
SP IEEE, VeriSign Corp, Virginia Techs Hume Ctr
DE BYOD; prioritized defense deployment; security representativeness;
temporal-spatial pattern
ID NETWORKS; MOBILE
AB Bring Your Own Device (BYOD) is an enterprise information technology (IT) policy that encourages employees to use their own devices to access sensitive corporate data at work through the enterprise IT infrastructure. Many current BYOD security practices are costly to implement and intrusive to employees, which, to some degree, negate BYOD's perceived benefits. To address such tension, we propose prioritized defense deployment: Instead of employing the same costly and intrusive security measures on each BYOD smartphone, more stringent threat detection/mitigation mechanisms are deployed on those representative smartphones, each of which represents, security-wise, a group of smartphones in the whole BYOD device pool. To this end, we propose a concept and a distributed algorithm, both named T-dominance, to capture the temporal-spatial pattern in an enterprise environment. We identify a few desirable properties of prioritized defense deployment, and analytically show that T-dominance satisfies such properties. We complement our analysis with simulations on real Wi-Fi association traces.
C1 [Peng, Wei; Zou, Xukai] Indiana Univ Purdue Univ, Dept Comp & Informat Sci, Indianapolis, IN 46202 USA.
[Li, Feng] Indiana Univ Purdue Univ, Dept Comp Informat & Leadersh Technol, Indianapolis, IN 46202 USA.
[Han, Keesook J.] Air Force Res Lab, Rome, NY USA.
[Wu, Jie] Temple Univ, Dept Comp & Informat Sci, Philadelphia, PA USA.
RP Peng, W (reprint author), Indiana Univ Purdue Univ, Dept Comp & Informat Sci, Indianapolis, IN 46202 USA.
NR 27
TC 2
Z9 2
U1 2
U2 3
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4799-0895-0
PY 2013
BP 37
EP 45
PG 9
WC Computer Science, Hardware & Architecture; Computer Science, Theory &
Methods; Telecommunications
SC Computer Science; Telecommunications
GA BA1QL
UT WOS:000332881600005
ER
PT J
AU Atighetchi, M
Soule, N
Pal, P
Loyall, J
Sinclair, A
Grant, R
AF Atighetchi, Michael
Soule, Nathaniel
Pal, Partha
Loyall, Joseph
Sinclair, Asher
Grant, Robert
GP IEEE
TI Safe Configuration of TLS Connections Beyond Default Settings
SO 2013 IEEE CONFERENCE ON COMMUNICATIONS AND NETWORK SECURITY (CNS)
LA English
DT Proceedings Paper
CT 1st IEEE International Conference on Communications and Network Security
(CNS)
CY OCT 14-16, 2013
CL Washington, DC
SP IEEE, VeriSign Corp, Virginia Techs Hume Ctr
DE Transport Layer Security (TLS); Secure Socket Layer (SSL);
configuration; secure flow modeling
AB Transport Layer Security (TLS) and its precursor Secure Sockets Layer (SSL) are the most widely deployed protocol to establish secure communication over insecure Internet Protocol (IP) networks. Providing a secure session layer on top of TCP, TLS is frequently the first defense layer encountered by adversaries who try to cause loss of confidentiality by sniffing live traffic or loss of integrity using man-in-the-middle attacks. Despite its wide deployment and evolution over the last 18 years, TLS remains vulnerable to a number of threats at the protocol layer and therefore does not provide strong security out-of-the-box, requiring tweaks to its configuration in order to provide the expected security benefits. This paper provides a summary of the current TLS threat surface together with a validated approach for minimizing the risk of TLS-compromise. The main contributions of this paper include 1) identification of configuration options that together maximize security guarantees in the context of recent TLS exploits and 2) specification of expected flows and automated comparison with observed flows to flag inconsistencies.
C1 [Atighetchi, Michael; Soule, Nathaniel; Pal, Partha; Loyall, Joseph] Raytheon BBN Technol, 10 Moulton St, Cambridge, MA 02138 USA.
[Sinclair, Asher; Grant, Robert] US Air Force, Res Lab, Griffiss AFB, NY 13441 USA.
RP Atighetchi, M (reprint author), Raytheon BBN Technol, 10 Moulton St, Cambridge, MA 02138 USA.
EM matighet@bbn.com; nsoule@bbn.com; ppal@bbn.com; jloyall@bbn.com;
asher.sinclair@af.rl.mil; robert.grant@af.rl.mil
NR 32
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4799-0895-0
PY 2013
BP 415
EP 422
PG 8
WC Computer Science, Hardware & Architecture; Computer Science, Theory &
Methods; Telecommunications
SC Computer Science; Telecommunications
GA BA1QL
UT WOS:000332881600069
ER
PT S
AU Bai, LD
Roy, S
Rangaswamy, M
AF Bai, Linda
Roy, Sumit
Rangaswamy, Muralidhar
GP IEEE
TI Compressive Radar Clutter Subspace Estimation Using Dictionary Learning
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
DE Compressive Sensing; Dictionary Learning; Space-Time Adaptive Processing
AB Space-Time Adaptive Processing (STAP) based on matched filter processing in the presence of additive clutter (modeled as colored noise) requires knowledge of the clutter covariance matrix. In practice, this is estimated via the sample covariance matrix using samples from the neighboring range bins around the reference bin. By applying compressive sensing, the number of training samples needed to estimate the covariance matrix can be significantly reduced, provided that the basis mismatch problem, inherent to compressive sensing can be mitigated. This paper presents an adaptive approach to choosing the best sparsifying basis, using dictionary learning to estimate the radar clutter subspace. Numerical results show that the proposed algorithm achieves the desired reduction in training samples, and is more accurate than previous reduced-rank algorithm baseline.
C1 [Bai, Linda; Roy, Sumit] Univ Washington, Dept Elect Engn, Seattle, WA 98195 USA.
[Rangaswamy, Muralidhar] Wright Patterson Air Force Base, AFRL RYAP, Dayton, OH USA.
RP Bai, LD (reprint author), Univ Washington, Dept Elect Engn, Seattle, WA 98195 USA.
FU National Science Foundation Graduate Research Fellowship [DGE-0718124]
FX This work was supported in part by the National Science Foundation
Graduate Research Fellowship to the 1st author under Grant No.
DGE-0718124.
NR 15
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800197
ER
PT S
AU Barott, WC
Himed, B
AF Barott, William C.
Himed, Braham
GP IEEE
TI Simulation Model for Wide-Area Multi-Service Passive Radar Coverage
Predictions
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
AB This paper describes the simulation approach and model for a software tool used to analyze passive radar scenarios. A database of known transmitters includes more than 250,000 sources from FM radio, digital television, cellular, and aeronautical radio-navigation aids. Terrain is considered using digital elevation maps and the Irregular Terrain Model. The tool calculates the expected detection and localization performance for PBR receivers, and can be used to guide receiver design.
C1 [Barott, William C.] Embry Riddle Aeronaut Univ, Elect Comp Software & Syst Engn, Daytona Beach, FL 32114 USA.
[Himed, Braham] US Air Force, Res Labs, Wright Patterson AFB, OH USA.
RP Barott, WC (reprint author), Embry Riddle Aeronaut Univ, Elect Comp Software & Syst Engn, Daytona Beach, FL 32114 USA.
FU American Society for Engineering Education (ASEE) [FA9550-09-C-0114]
FX This work was supported by the Air Force Summer Faculty Fellowship
Program through the American Society for Engineering Education (ASEE)
under contract FA9550-09-C-0114.
NR 16
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 4
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800168
ER
PT S
AU Bell, KL
Johnson, JT
Baker, CJ
Smith, GE
Rangaswamy, M
AF Bell, Kristine L.
Johnson, Joel T.
Baker, Christopher J.
Smith, Graeme E.
Rangaswamy, Muralidhar
GP IEEE
TI Modeling and Simulation for Multistatic Coherent MIMO Radar
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
ID TIME; CLUTTER
AB Multiple input multiple output (MIMO) radar systems employ multiple transmit and receive elements with transmit elements that have the ability to transmit arbitrary waveforms simultaneously and receive elements that have the ability to process all of the transmitted signals jointly. For ground moving target indication (GMTI) systems, MIMO offers the potential to improve angular resolution and illumination time of the radar and therefore lower the minimum detectable velocity of moving targets. In this paper, we consider GMTI systems consisting of airborne platforms in configurations which include collocated transmit and receive elements on a single platform, distributed transmit/receive elements using multiple platforms, and hybrid arrangements. A multistatic coherent MIMO GMTI model is formulated that consists of multiple spatially distributed, moving, multi-element transmit and receive platforms that form multiple bistatic coherent MIMO pairs. Optimum and adaptive detectors are developed and performance is evaluated via simulation for the multistatic coherent MIMO system as well as each bistatic coherent MIMO pair. A clutter simulation methodology is presented that combines a realistic physics-based bistatic scattering model with a spherically invariant random vector (SIRV) random sample generator.
C1 [Bell, Kristine L.] Metron Inc, 1818 Lib St,Suite 600, Reston, VA 20190 USA.
[Johnson, Joel T.; Baker, Christopher J.; Smith, Graeme E.] Ohio State Univ, Dept Elect & Comp Engn, Elect Sci Lab, Columbus, OH 43210 USA.
[Rangaswamy, Muralidhar] US Air Force Res Lab, Sensors Direct, Radar Signal Proc Branch, Wright Patterson AFB, OH USA.
RP Bell, KL (reprint author), Metron Inc, 1818 Lib St,Suite 600, Reston, VA 20190 USA.
FU U.S. Air Force Research Laboratory [FA8650-12-M-1384]
FX This work was supported by the U.S. Air Force Research Laboratory under
contract FA8650-12-M-1384.
NR 23
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800131
ER
PT S
AU Chen, Z
Li, HB
Rangaswamy, M
AF Chen, Zhu
Li, Hongbin
Rangaswamy, Muralidhar
GP IEEE
TI Asymptotic Performance Analysis of the Conjugate Gradient Reduced-Rank
Adaptive Detector
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
ID RADAR
AB We consider an adaptive reduced-rank CG-AMF detector, obtained by using the conjugate gradient (CG) algorithm to solve for the weight vector of the adaptive matched filter (AMF). We examine the output signal-to-interference-and-noise ratio (SINR) of the CG-AMF detector in the presence of strong clutter/interference. An asymtotic expression of the probability density function of the output SINR is obtained. Numerical results show that for a fixed training size, the CG-AMF detector often reaches its peak output SINR with a lower rank compared with the other reduced-rank detectors, which implies that the CG-AMF detector has lower computational complexity and less training requirement
C1 [Chen, Zhu; Li, Hongbin] Stevens Inst Technol, ECE Dept, Hoboken, NJ 07030 USA.
[Rangaswamy, Muralidhar] AFRL, RYAP, Wright Patterson AFB, OH 45433 USA.
RP Chen, Z (reprint author), Stevens Inst Technol, ECE Dept, Hoboken, NJ 07030 USA.
EM Hongbin.Li@stevens.edu; Muralidhar.Rangaswamy@wpafb.af.mil
NR 20
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800040
ER
PT S
AU del Arroyo, JRG
Jackson, JA
AF del Arroyo, Jose R. Gutierrez
Jackson, Julie Ann
GP IEEE
TI Collecting and Processing WiMAX Ground Returns for SAR Imaging
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
ID RADAR
AB Employing signals of opportunity for synthetic aperture radar (SAR) imaging is the subject of recent research. This paper presents concepts on the collection and processing of WiMAX OFDM waveforms to produce SAR ground images. A radar collection model is presented followed by the signal processing approach based on previously derived OFDM phase history models. Two multi-symbol match filter designs are described. Experimental SAR images using WiMAX waveforms are shown to validate the overarching signal processing approach.
C1 [del Arroyo, Jose R. Gutierrez; Jackson, Julie Ann] US Air Force, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
RP Jackson, JA (reprint author), US Air Force, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
EM julie.jackson@afit.edu
NR 15
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800194
ER
PT S
AU Gogineni, S
Rangaswamy, M
Nehorai, A
AF Gogineni, Sandeep
Rangaswamy, Muralidhar
Nehorai, Arye
GP IEEE
TI Multi-modal OFDM Waveform Design
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
DE OFDM radar; channel capacity; detection; Mahalanobis distance
ID RADAR
AB Due to limitations in the bandwidth resources, sharing the spectrum across several modalities has become increasingly important. In this paper, we will consider OFDM spectral sharing between radar and wireless communication systems. We will define and compute the importance of each sub-carrier to both the modalities by considering the radar detection performance and channel capacity. We will design the OFDM waveforms for communications and radar by appropriately allocating the sub-carriers using these importance functions. Using numerical simulations, we will demonstrate the performance of our proposed design mechanism.
C1 [Gogineni, Sandeep] Wright State Res Inst, Beavercreek Twp, OH USA.
[Rangaswamy, Muralidhar] Air Force Res Lab, Wright Patterson AFB, OH USA.
[Nehorai, Arye] Washington Univ, Dept Elect & Syst Engn, St Louis, MO USA.
RP Gogineni, S (reprint author), Wright State Res Inst, Beavercreek Twp, OH USA.
EM sandeep.gogineni@wright.edu; muralidhar.rangaswamy@wpafb.af.mil;
nehorai@ese.wustl.edu
FU NSF [CCF-1014908]; AFOSR [FA9550-11-1-0210]
FX This work was supported by NSF Grant CCF-1014908 and AFOSR Grant
FA9550-11-1-0210.
NR 11
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800134
ER
PT S
AU Hersey, RK
Showman, GA
Culpepper, E
AF Hersey, Ryan K.
Showman, Gregory A.
Culpepper, Edwin
GP IEEE
TI Clutter-Based Array Calibration for Enhanced Geolocation Accuracy
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
ID RADAR
AB Accurate target geolocation is critical to ground moving target indication (GMTI) performance. Large geolocation errors can make interpreting GMTI detection results difficult, particularly in dense target environments. Geolocation errors can result from a combination of antenna channel errors and platform inertial navigation system (INS) biases. In this paper we develop clutter-based array calibration techniques that remove unknown, channel-to-channel, phase and amplitude errors. These clutter-based techniques utilize distributed clutter for calibration and require no a priori knowledge of the scene or calibration targets. We also apply these techniques to estimate the platform orientation, which significantly improves cross-range geolocation accuracy as compared to platform INS orientation estimates. We present results on measured X-band data.
C1 [Hersey, Ryan K.; Showman, Gregory A.] Georgia Tech Res Inst, Sensors & Electromagnet Applicat Lab, Atlanta, GA 30332 USA.
[Culpepper, Edwin] US Air Force Res Lab, Wright Patterson AFB, OH USA.
RP Hersey, RK (reprint author), Georgia Tech Res Inst, Sensors & Electromagnet Applicat Lab, Atlanta, GA 30332 USA.
NR 7
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800122
ER
PT S
AU Jameson, B
Garmatyuk, D
Morton, YTJ
Ewing, R
AF Jameson, Brian
Garmatyuk, Dmitriy
Morton, Y. T. Jade
Ewing, Robert
GP IEEE
TI Short-Range Rotational SAR Imaging of Indoor Environments Using UWB OFDM
Sensor
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
ID RADAR
AB In this paper we discuss the SAR processing algorithm and results associated with the ultra-wideband (UWB) orthogonal frequency division multiplexing (OFDM) system. An efficient method of OFDM SAR imaging for strip-map configuration has been proposed before; in this work we expand upon it and add a new configuration - rotational SAR. We derive the relevant parameters of the rotational SAR system; explore challenges associated with extremely short-range UWB rotational SAR imaging; and present simulation results of imaging point-like targets in presence of noise.
C1 [Jameson, Brian; Garmatyuk, Dmitriy; Morton, Y. T. Jade] Miami Univ, Dept ECE, Oxford, OH 45056 USA.
[Ewing, Robert] RYMDB, AFRL, Wright Patterson AFB, Dayton, OH 45433 USA.
RP Jameson, B (reprint author), Miami Univ, Dept ECE, Oxford, OH 45056 USA.
EM jamesobd@muohio.edu; garmatd@muohio.edu; mortonyt@muohio.edu;
Robert.Ewing@wpafb.af.mil
FU Dayton Area Graduate Studies Institute (DAGSI) [RY17-MU-11-1]
FX This work was partially supported by the Dayton Area Graduate Studies
Institute (DAGSI) Grant RY17-MU-11-1.
NR 13
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800058
ER
PT S
AU Jameson, B
Garmatyuk, D
Morton, YTJ
Kauffman, K
Ewing, R
AF Jameson, Brian
Garmatyuk, Dmitriy
Morton, Y. T. Jade
Kauffman, Kyle
Ewing, Robert
GP IEEE
TI Reconnaissance Using Adaptive Multi-Carrier Radar
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
ID SYSTEM
AB This paper discusses the implementation and verification of original methods for performing short-range navigation and detection in common indoor environments. These methods utilize a software-defined ultra-wideband (UWB) orthogonal frequency division multiplexing (OFDM) radar system. Specifically, the system is used to identify the presence of targets while being subjected to realistic noise and clutter by using disturbance models created using experimentally-collected training data. Additionally, the same sensor is utilized to detect and the location and dimensions of doorways using the generalized likelihood ratio test (GLRT) and frequency profile matching (FPM), thus allowing for a localized navigation solution should the system need to move into adjoining rooms. These developments provide functionality that will assist a robotic platform that operates autonomously in unknown indoor environments.
C1 [Jameson, Brian; Garmatyuk, Dmitriy; Morton, Y. T. Jade] Miami Univ, Dept Elect & Comp Engn, Oxford, OH 45056 USA.
[Kauffman, Kyle] Air Force Inst Technol, Dept Elect & Comp Engn, Dayton, OH 45433 USA.
[Ewing, Robert] RYMD, AFRL, Wright Patterson AFB, Dayton, OH 45433 USA.
RP Jameson, B (reprint author), Miami Univ, Dept Elect & Comp Engn, Oxford, OH 45056 USA.
EM jamesobd@muohio.edu; garmatd@muohio.edu; mortonyt@muohio.edu;
kyle.j.kauffman@gmail.com; Robert.Ewing@wpafb.mil
FU Dayton Area Graduate Studies Institute (DAGSI) [RY17-MU-11-1]
FX This work was partially supported by the Dayton Area Graduate Studies
Institute (DAGSI) Grant RY17-MU-11-1.
NR 9
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800057
ER
PT S
AU Kang, B
Monga, V
Rangaswamy, M
AF Kang, Bosung
Monga, Vishal
Rangaswamy, Muralidhar
GP IEEE
TI On the Practical Merits of Rank Constrained ML Estimator of Structured
Covariance Matrices
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
ID ADAPTIVE RADAR; ALGORITHM; DETECTOR
AB Estimation of the disturbance or interference covariance matrix plays a central role on radar target detection in the presence of clutter, noise and jammer. The disturbance covariance matrix should be inferred from training sample observations in practice. Traditional maximum likelihood (ML) estimators lead degraded false alarm and detection performance in the realistic regime of limited training. For this reason, informed estimators have been actively researched. Recently, a new estimator [1] that explicitly incorporates rank information of the clutter subspace was proposed. This paper reports significant new analytical and experimental investigations on the rank-constrained maximum likelihood (RCML) estimator. First, we show that the RCML estimation problem formulated in [1] has a closed form. Next, we perform new and rigorous experimental evaluation in the form of reporting: 1.) probability of detection versus signal to noise ratio (SNR), and 2.) SINR performance under heterogeneous (target corrupted) training data. In each case, we compare against widely used existing estimators and show that exploiting the rank information has significant practical merits in robust estimation.
C1 [Kang, Bosung; Monga, Vishal] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
[Rangaswamy, Muralidhar] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Kang, B (reprint author), Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
EM bkang@psu.edu; vmonga@engr.psu.edu; Muralidhar.Rangaswamy@wpafb.af.mil
NR 19
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800052
ER
PT S
AU Setlur, P
Devroye, N
Rangaswamy, M
AF Setlur, Pawan
Devroye, Natasha
Rangaswamy, Muralidhar
GP IEEE
TI Waveform Design and Scheduling in Space-Time Adaptive Radar
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
AB Waveform design and waveform scheduling are addressed in the context of space time adaptive processing (STAP) for radar. An air-borne radar with an array of sensors is assumed, which interrogates ground based targets. The designed waveform is assumed to be transmitted over one coherent processing interval (CPI). The waveform design and waveform scheduling problems are formulated with a cost function similar to the Minimum Variance Distortionless Response (MVDR) cost function as in classical radar STAP. Least-squared solutions for the designed waveform are obtained. It is shown that both the designed waveform and the scheduled waveforms will depend on the spatial and Doppler responses of the desired target; in particular, its spatial and temporal steering vectors. The focus of this paper will be the performance of the designed and scheduled waveforms for unknown correlation matrices but estimated from the training data, and will be addressed via simulations.
C1 [Setlur, Pawan; Devroye, Natasha] Univ Illinois, Chicago, IL 60607 USA.
[Rangaswamy, Muralidhar] US Air Force Res Lab, RYAP, Wright Patterson AFB, OH 45433 USA.
RP Setlur, P (reprint author), Univ Illinois, Chicago, IL 60607 USA.
FU US AFOSR [FA 9550-10-1-0239]
FX This work was sponsored by US AFOSR under award FA 9550-10-1-0239; no
official endorsement must be inferred.
NR 10
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800146
ER
PT S
AU Wang, P
Li, HB
Himed, B
AF Wang, Pu
Li, Hongbin
Himed, Braham
GP IEEE
TI MOVING TARGET DETECTION FOR DISTRIBUTED MIMO RADAR WITH IMPERFECT
WAVEFORM SEPARATION
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
DE Distributed MIMO radar; moving target detection; generalized likelihood
ratio test; hypothesis testing
AB In this paper, we consider the problem of detecting a moving target with a distributed multiple-input multiple-output (MIMO) radar when perfect waveform separations at the local receivers are no longer valid. By formulating a composite hypothesis testing problem with a subspace modeling of the target residual, the generalized likelihood ratio test (GLRT) is developed by deriving the maximum likelihood (ML) estimates of the unknown parameters. Simulation results are provided to compare the proposed GLRT solution with existing MIMO detectors that do not account for target residuals.
C1 [Wang, Pu; Li, Hongbin] Stevens Inst Technol, ECE Dept, Hoboken, NJ 07030 USA.
[Himed, Braham] AFRL, RYMD, Wright Patterson AFB, OH 45433 USA.
RP Wang, P (reprint author), Stevens Inst Technol, ECE Dept, Hoboken, NJ 07030 USA.
FU Dynetics, Inc; Air Force Research Laboratory (AFRL) [FA8650-08-D-1303]
FX This work was supported in part by a subcontract with Dynetics, Inc. for
research sponsored by the Air Force Research Laboratory (AFRL) under
Contract FA8650-08-D-1303.
NR 8
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800041
ER
PT S
AU Zelnio, AM
Moore, LJ
Roush, CR
Rigling, BD
AF Zelnio, Anne M.
Moore, Linda J.
Roush, Craig R.
Rigling, Brian D.
GP IEEE
TI Cramer-Rao Lower Bound on Time of Arrival Estimates for an
Envelope-Detected Pulse
SO 2013 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY APR 29-MAY 03, 2013
CL Ottawa, CANADA
SP IEEE, IEEE Ottawa Sect, AESS
AB The pulse time of arrival is an important parameter estimated in an electronic warfare receiver. The Cramer-Rao bound provides a lower bound on the variance of unbiased parameter estimates. In the past, time of arrival performance has been compared to a bound derived under Gaussian assumptions. However, these estimates are frequently computed from the pulse envelope, which exhibits Rician statistics that are approximately Gaussian only at high signal-to-noise ratios. This correspondence derives the Rician Cramer-Rao bound on time of arrival estimation accuracy.
C1 [Zelnio, Anne M.; Moore, Linda J.] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Roush, Craig R.] N Ask, Aurora, CO 80016 USA.
[Rigling, Brian D.] Wright State Univ, Dept Elect Engn, Dayton, OH 45435 USA.
RP Zelnio, AM (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
NR 7
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-5794-4; 978-1-4673-5792-0
J9 IEEE RAD CONF
PY 2013
PG 4
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BA1GF
UT WOS:000332480800201
ER
PT J
AU Balfour, RE
Donnelly, BP
AF Balfour, Robert E.
Donnelly, Brian P.
GP IEEE
TI The What, Why and How of Achieving Urban Telepresence
SO 2013 NINTH ANNUAL CONFERENCE ON LONG ISLAND SYSTEMS, APPLICATIONS AND
TECHNOLOGY (LISAT 2013)
LA English
DT Proceedings Paper
CT 9th Annual Conference on IEEE Long Island Systems, Applications and
Technology (LISAT)
CY MAY 03, 2013
CL Farmingdale State Coll, Farmingdale, NY
SP IEEE, IEEE Long Isl Sect, Farmingdale State Coll, Inst Res & Technol Transfer
HO Farmingdale State Coll
DE urban telepresence; overwatch; augmented virtual reality; situational
awareness; fourDscape
AB 21st century advancements in information technology are enabling a powerful emerging capability known as Urban Telepresence (UT). This capability allows users to experience an operational environment (e. g. an urban cityscape) via an immersive, remote browser interface. UT operators can interact in real-time with personnel and sensor assets in that environment, and can derive comprehensive shared situational awareness (SA) from a mixed reality (i.e. live-over-virtual-overtime) augmentation of the environment with supporting intelligence, including past/present/forecast information. The deployment of UT capability becomes a force multiplier for military operations as well as civilian safety, security and emergency response. By providing on-scene sensor data registered into the virtual scene of the real environment, UT facilitates effective supervisory control of the sensors to follow situation dynamics, and creates powerful enhanced "overwatch" abilities. With super-human ability to change perspective and evaluate the scene both spatially and temporally, the "virtual operator" becomes a valued team member to personnel in the environment in real-time. In the future, UT will play a substantial role for missions in both non-cooperative (e.g. military) and cooperative (e. g. natural disaster response) environments.
fourDscape (R) four-dimensional (4D) browser/server technology is already deployed and providing enhanced situational awareness in homeland security applications, and is currently being leveraged by the U. S. Air Force Research Laboratory (AFRL) as a baseline technology for developing and evaluating a comprehensive Urban Telepresence integrated system and human-machine interface (HMI). Some of the important technical components of this UT capability include: an immersive, augmented virtual reality (AVR) environment providing an untethered perspective into the real-world operational environment; a naturalistic user interface for temporal-spatial navigation and information management; an effective HMI to perform supervisory control of manned/unmanned on-scene assets and sharing of vital information; and disparate multi-systems integration to develop a complete temporal-spatial 4D context for comprehensive shared situational awareness. In addition, a Testing/Training Methodology and simulation environment is being developed, combining both performance-based and knowledge-based measures of effectiveness (MoEs) techniques, which will evaluate the value UT adds to SA in an overwatch capacity.
C1 [Balfour, Robert E.] Balfour Technol LLC, Bethpage, NY 11714 USA.
[Donnelly, Brian P.] US Air Force Res Lab, Wright Patterson AFB, OH USA.
RP Balfour, RE (reprint author), Balfour Technol LLC, Bethpage, NY 11714 USA.
EM bob@BAL4.com; brian.donnelly@wpafb.af.mil
FU U.S. Department of the Air Force, Air Force Research Laboratory, under
an SBIR Phase III RDTE
FX This work is sponsored in part by the U.S. Department of the Air Force,
Air Force Research Laboratory, under an SBIR Phase III RDT&E contract,
leveraging previous DHS HSARPA SBIR Phase I/II efforts in Automated
Situational Awareness. This information does not necessarily reflect the
policy of the U.S. Government, and no official endorsement should be
inferred. The contents of this paper have been Cleared and Approved for
public release (Distribution A) by the USAF AFRL: 88ABW Cleared
3/13/2013; 88ABW-2013-1201.
NR 5
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-6244-3
PY 2013
PG 6
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BA1QQ
UT WOS:000332900200022
ER
PT S
AU Clark, MR
Hopkinson, KM
AF Clark, Michael R.
Hopkinson, Kenneth M.
GP IEEE
TI Towards an Understanding of the Tradeoffs in Adversary Models of Smart
Grid Privacy Protocols
SO 2013 IEEE POWER AND ENERGY SOCIETY GENERAL MEETING (PES)
SE IEEE Power and Energy Society General Meeting PESGM
LA English
DT Proceedings Paper
CT General Meeting of the IEEE-Power-and-Energy-Society (PES)
CY JUL 21-25, 2013
CL Vancouver, CANADA
SP IEEE Power & Energy Soc
DE Cryptography; Smart grids; Adversary models; Homomorphic encryption
AB Maintaining privacy while still providing the advanced functionality of the smart grid is a very important topic in the power and energy communities. Recently proposed protocols attempt to solve the associated problems in such a way that privacy is maintained. These protocols are typically proven secure under one of two adversary models: the honest-but-curious model or the malicious model. The honest-but-curious model is the weaker of the two in that adversaries are assumed to be honest in carrying out the protocol without deviation but use any information gathered during the process to violate another party's privacy. This model is often justified in the literature by assuming that devices are tamper resistant. It turns out that each of these models has its benefits and disadvantages. Add in the assumption of anti-tamper protections, and the story becomes even more complicated. In this work, we initiate a look at the tradeoffs of the two models (along with the anti-tamper assumption) by comparing one privacy preserving data-aggregation protocol from each model found in the published literature. We examine the computation and communication complexities of each protocol and study how these affect the scalability of the protocols. We also comment on anti-tamper protections and their associated computational costs.
C1 [Clark, Michael R.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Hopkinson, Kenneth M.] Air Force Inst Technol, Wright Patterson AFB, OH USA.
RP Clark, MR (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
EM michael.clark2@wpafb.af.mil; kenneth.hopkinson@afit.edu
NR 10
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1944-9925
BN 978-1-4799-1303-9
J9 IEEE POW ENER SOC GE
PY 2013
PG 5
WC Energy & Fuels; Engineering, Electrical & Electronic
SC Energy & Fuels; Engineering
GA BA0LX
UT WOS:000331874300238
ER
PT S
AU Baek, SS
Kwon, H
Yoder, JA
Pack, D
AF Baek, Stanley S.
Kwon, Hyukseong
Yoder, Josiah A.
Pack, Daniel
BE Amato, N
TI Optimal Path Planning of a Target-Following Fixed-Wing UAV Using
Sequential Decision Processes
SO 2013 IEEE/RSJ INTERNATIONAL CONFERENCE ON INTELLIGENT ROBOTS AND SYSTEMS
(IROS)
SE IEEE International Conference on Intelligent Robots and Systems
LA English
DT Proceedings Paper
CT IEEE/RSJ International Conference on Intelligent Robots and Systems
(IROS)
CY NOV 03-08, 2013
CL Tokyo, JAPAN
SP IEEE, IEEE Robot & Automat Soc, IEEE Ind Elect Soc, Robot Soc Japan, New Technol Fdn, Soc Instrument & Control Engineers, Kawada Robot, Reflexxes GmbH, Telecommunicat Advancement Fdn, Tateisi Sci & Technol Fdn
ID TRACKING; VEHICLES; SEARCH
AB In this work, we consider the optimal path of a fixed-wing unmanned aerial vehicle (UAV) tracking a mobile surface target. One of the limitations of fixed-wing UAVs in tracking mobile targets is the lack of hovering capability when the target moves much slower than the minimum UAV speed, requiring the UAV maintain an orbit about the target. In this paper, we propose a method to find the optimal policy for fixed-wing UAVs to minimize the location uncertainty of a mobile target. Using a grid-based Markov Decision Process (MDP), we use an off-line policy iteration algorithm to find an optimal UAV path in a coarse discretized state space, followed by an on-line policy iteration algorithm that applies a finer grid MDP to the region of interest to find the final optimal UAV trajectory. We validate the proposed algorithm using computer simulations. Comparing the simulation results with other methods, we show that the proposed method has up to 13% decrease in error uncertainty than ones resulted using conventional methods.
C1 [Baek, Stanley S.; Kwon, Hyukseong; Yoder, Josiah A.] US Air Force Acad, Dept Elect & Comp Engn, Acad Ctr UAS Res, Colorado Springs, CO 80840 USA.
[Pack, Daniel] Univ Texas San Antonio, Dept Elect & Comp Engn, San Antonio, TX 78249 USA.
RP Baek, SS (reprint author), US Air Force Acad, Dept Elect & Comp Engn, Acad Ctr UAS Res, Colorado Springs, CO 80840 USA.
NR 13
TC 3
Z9 3
U1 1
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-0858
BN 978-1-4673-6358-7
J9 IEEE INT C INT ROBOT
PY 2013
BP 2955
EP 2962
PG 8
WC Computer Science, Artificial Intelligence; Computer Science,
Cybernetics; Robotics
SC Computer Science; Robotics
GA BA0HU
UT WOS:000331367403005
ER
PT S
AU Benson, TM
Hersey, RK
Culpepper, E
AF Benson, Thomas M.
Hersey, Ryan K.
Culpepper, Edwin
GP IEEE
TI GPU-Based Space-Time Adaptive Processing (STAP) for Radar
SO 2013 IEEE CONFERENCE ON HIGH PERFORMANCE EXTREME COMPUTING (HPEC)
SE IEEE High Performance Extreme Computing Conference
LA English
DT Proceedings Paper
CT IEEE Conference on High Performance Extreme Computing (HPEC)
CY SEP 10-12, 2013
CL Waltham, MA
SP IEEE
AB Space-time adaptive processing (STAP) utilizes a two-dimensional adaptive filter to detect targets within a radar data set with speeds similar to the background clutter. While adaptively optimal solutions exist, they are prohibitively computationally intensive. Thus, researchers have developed alternative algorithms with nearly optimal filtering performance and greatly reduced computational intensity. While such alternatives reduce the computational requirements, the computational burden remains significant and efficient implementations of such algorithms remains an area of active research. This paper focuses on an efficient graphics processor unit (GPU) based implementation of the extended factored algorithm (EFA) using the compute unified device architecture (CUDA) framework provided by NVIDIA.
C1 [Benson, Thomas M.; Hersey, Ryan K.] Georgia Tech Res Inst, Sensors & Electromagnet Applicat Lab, Atlanta, GA 30332 USA.
[Culpepper, Edwin] Air Force Res Lab, Wright Patterson AFB, OH USA.
RP Benson, TM (reprint author), Georgia Tech Res Inst, Sensors & Electromagnet Applicat Lab, Atlanta, GA 30332 USA.
NR 11
TC 0
Z9 0
U1 0
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2377-6943
BN 978-1-4799-1365-7; 978-1-4799-1364-0
J9 IEEE HIGH PERF EXTR
PY 2013
PG 6
WC Computer Science, Hardware & Architecture; Computer Science, Theory &
Methods
SC Computer Science
GA BA0SQ
UT WOS:000332186600026
ER
PT B
AU Rhodes, M
AF Rhodes, Matthew
BE Blair, D
TI Democracy and Armed Forces in Europe and Eurasia
SO MILITARY ENGAGEMENT: INFLUENCING ARMED FORCES WORLDWIDE TO SUPPORT
DEMOCRATIC TRANSITIONS, VOL 2: REGIONAL AND COUNTRY STUDIES
LA English
DT Article; Book Chapter
C1 [Rhodes, Matthew] George C Marshall European Ctr Secur Studies, Program Cent Europe, Garmisch Partenkirchen, Germany.
[Rhodes, Matthew] George C Marshall European Ctr Secur Studies, Program Southeast Europe, Garmisch Partenkirchen, Germany.
[Rhodes, Matthew] Palacky Univ, Olomouc, Czech Republic.
[Rhodes, Matthew] Cent Coll, Danville, KY USA.
[Rhodes, Matthew] US Air War Coll, Montgomery, AL USA.
RP Rhodes, M (reprint author), George C Marshall European Ctr Secur Studies, Program Cent Europe, Garmisch Partenkirchen, Germany.
NR 43
TC 0
Z9 0
U1 0
U2 0
PU BROOKINGS INST
PI WASHINGTON
PA 1775 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
BN 978-0-8157-2478-0; 978-0-8157-2480-3
PY 2013
BP 274
EP 299
PG 26
WC Political Science
SC Government & Law
GA BA0FG
UT WOS:000331133100014
ER
PT S
AU Leslie, CJ
Boakye, EE
Keller, KA
Cinibulk, MK
AF Leslie, Clifford J.
Boakye, Emmanuel E.
Keller, Kristin A.
Cinibulk, Michael K.
BE Bansal, NP
Singh, JP
Ko, SW
Castro, RHR
Pickrell, G
Manjooran, NJ
Nair, KM
Singh, G
TI DEVELOPMENT OF CONTINUOUS SiC FIBER REINFORCED HfB2-SiC COMPOSITES FOR
AEROSPACE APPLICATIONS
SO PROCESSING AND PROPERTIES OF ADVANCED CERAMICS AND COMPOSITES V
SE Ceramic Transactions
LA English
DT Proceedings Paper
CT Materials Science and Technology Conference (MS and T)
CY OCT 07-12, 2012
CL Pittsburgh, PA
ID OXIDATION RESISTANCE; SILICON-CARBIDE; HAFNIUM
AB The fabrication of SiC/HfB2-SiC continuous fiber reinforced composites by polymer impregnation and slurry infiltration of partially densified SiC-SiC laminates was investigated. A polymer-based HfB2 precursor was synthesized and used to impregnate the preform panels via vacuum infiltration. Subsequent heat treatment at 1600 degrees C in argon carbothermally reduced the polymer to HfB2 and residual carbon. Slurry infiltration was performed via vacuum infiltration, pressure infiltration, vibration infiltration, vibration-assisted vacuum infiltration and vibration-assisted pressure infiltration using 5 vol % HfB2 slurries in ethanol. An additional pressure infiltration experiment was performed using a 15 vol % slurry. Subsequent heat treatment at 1600 degrees C was sufficient to initiate sintering of HfB2 particles, but not densification. Polymer impregnation resulted in poor infiltration due to the low ceramic yield of the polymer and poor adhesion to the preform. SEM analysis, Archimedes density measurements and computational image analysis showed some success for the slurry infiltration techniques, with the best results observed for pressure infiltration using the 5 vol % slurry.
C1 [Leslie, Clifford J.; Boakye, Emmanuel E.; Keller, Kristin A.; Cinibulk, Michael K.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Leslie, CJ (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 15
TC 2
Z9 2
U1 0
U2 2
PU JOHN WILEY & SONS
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND
SN 1042-1122
BN 978-1-118-74409-3
J9 CERAM TRANS
PY 2013
VL 240
BP 3
EP 12
PG 10
WC Materials Science, Ceramics; Materials Science, Composites
SC Materials Science
GA BA0HO
UT WOS:000331272400001
ER
PT S
AU Lawal, O
Kettwich, SC
Iacono, ST
AF Lawal, Olawale
Kettwich, Sharon C.
Iacono, Scott T.
BE Clarson, SJ
Owen, MJ
Smith, SD
Van Dyke, M
Brook, M
Mabry, J
TI Synthesis, Characterization, and Properties of New Fluorosilicone Block
Copolymers A Study of the Synthesis and Properties of Perfluorcyclobutyl
(PFCB) Aryl Ether Modified Siloxane Block Polymers
SO PROGRESS IN SILICONES AND SILICONE-MODIFIED MATERIALS
SE ACS Symposium Series
LA English
DT Proceedings Paper
CT Silicones and Silicone-Modified Materials Symposium / 243rd National
Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem
ID CONTAINING FLUOROPOLYMERS; PHOTOLUMINESCENCE
AB In this work, perfluorocyclobutyl (PFCB) aryl ether block dimethylsilioxane polymers were prepared via the step-growth addition polymerization of discreetly sized PFCB prepolymers and carbinol (hydroxyl) terminated silicones. These hybrid fluorosilicone polymer systems displayed high thermal stability, are entirely amorphous, and solution processable producing transparent films with high optical clarity. The synthesis, characterization, thermal analyses, and current scope of hybrid PFCB aryl ether polymer systems are discussed.
C1 [Lawal, Olawale] US Air Force Acad, Dept Chem, Colorado Springs, CO 80840 USA.
RP Lawal, O (reprint author), US Air Force Acad, Dept Chem, 2355 Fairchild Dr,Suite 2N225, Colorado Springs, CO 80840 USA.
EM scott.iacono@usafa.edu
NR 17
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 USA
SN 0097-6156
BN 978-0-8412-2964-8
J9 ACS SYM SER
JI ACS Symp. Ser.
PY 2013
VL 1154
BP 79
EP 86
PG 8
WC Materials Science, Multidisciplinary; Polymer Science
SC Materials Science; Polymer Science
GA BA0KG
UT WOS:000331591200006
ER
PT J
AU Cao, SY
Zheng, YF
Ewing, RL
AF Cao, Siyang
Zheng, Yuan F.
Ewing, Robert L.
GP IEEE
TI Wavelet-based radar waveform adaptable for different operation
conditions
SO 2013 10TH EUROPEAN RADAR CONFERENCE (EURAD)
SE European Radar Conference EuRAD
LA English
DT Proceedings Paper
CT 10th European Radar Conference (EuRAD)
CY OCT 09-11, 2013
CL Nuremberg, GERMANY
SP APS, AESS
DE Wavelets; Wavelet Packet; Cognitive Radar; Bats Waveforms
ID DESIGN
AB We propose using sets of waveforms for different radar operation conditions based on wavelets. The new waveforms can adjust the bandwidth and transmission power adapting to the target and environmental conditions. Each scaling function or wavelet packet can form a narrow-bandwidth pulse with certain transmission power. Narrow bandwidth and large transmission power waveforms are effective for accurate speed detection of long-range targets. A new approach of pulse integration can summarize the detection results of multiple narrow bandwidth pulses producing a high range resolution result of an equivalently wide bandwidth pulse. For close-range tracking task, a set of wide bandwidth pulse waveforms (even a single waveform) with low transmission power can quickly update the range information, and reduce background interferences. The adaption approach is verified by experiments which also demonstrate the purposed waveforms suppressing range sidelobes more effectively than traditional linear frequency modulated (LFM) waveforms.
C1 [Cao, Siyang; Zheng, Yuan F.] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
[Ewing, Robert L.] US Air Force, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Cao, SY (reprint author), Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
NR 11
TC 1
Z9 1
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-2-87487-033-0
J9 EUROP RADAR CONF
PY 2013
BP 149
EP 152
PG 4
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BA0AG
UT WOS:000330790600038
ER
PT B
AU Reyes, JA
Shelley, TJ
Sandstrom, MM
Brown, GW
Phillips, JJ
Warner, KF
Remmers, DL
Hsu, PC
Reynolds, JG
AF Reyes, Jose A.
Shelley, Timothy J.
Sandstrom, Mary M.
Brown, Geoffrey W.
Phillips, Jason J.
Warner, Kirstin F.
Remmers, Daniel L.
Hsu, Peter C.
Reynolds, John G.
GP IEEE
TI Challenges of Small-Scale Safety and Thermal Testing of Improvised
Explosives: Results from the Integrated Data Collection Analysis (IDCA)
Program Proficiency Test
SO 2013 IEEE INTERNATIONAL CONFERENCE ON TECHNOLOGIES FOR HOMELAND SECURITY
(HST)
LA English
DT Proceedings Paper
CT 13th IEEE International Conference on Technologies for Homeland Security
(HST)
CY NOV 12-14, 2013
CL Waltham, MA
SP IEEE, IEEE USA, IEEE Biometr Council, Massport, Govt Technol and Serv Coalit, Boston Prod Management Assoc, Massachusetts High Technol Council, Market Res Media, IEEE Women Engn, Domest Preparedness Com, DPJ Weekly Brief, DomPrep Journal, IEEE Boston Sect
DE Small-scall safety testing; thermal testing; proficiency test;
round-robin test; safety testing protocols; HME
AB The IDCA Program has been conducting a Proficiency (Round Robin) Test on the application of Small-Scale Safety and Thermal (SSST) testing to Home Made or Improvised Explosives (HMEs). This Proficiency test has been designed to test the accuracy and relevancy of SSST testing among explosives testing laboratories (3 DOE and 2 DoD), where the testing is performed on the same batches of materials (17 HMEs and 2 Standards), prepared the same way. The results so far have indicated that standard testing methods are not adequate for HMEs, as many conflicting and inconclusive results have been documented:
Impact sensitivity non-predictively affected by testing conditions;
Detection of positive reaction (go/no-go) has too much variability;
Thermal testing has sampling issues
As the IDCA continues to compare and evaluate results from the Proficiency Test, many issues are beginning to coalesce about the application of traditional SSST Testing methods to HMEs. Many of the issues show that traditional methods used for military explosives MUST be modified before meaningful results can be obtained for HMEs. The IDCA is finding if traditional methods are not revised, testing can give misleading results that could lead to developing handling practices that are not adequate for working safely.
C1 [Reyes, Jose A.] Appl Res Associates Inc, Tyndall AFB, FL 32403 USA.
[Shelley, Timothy J.] Bur Alcoho Tobacco & Firearm, Redstone Arsenal, AL USA.
[Sandstrom, Mary M.; Brown, Geoffrey W.] LANL, Los Alamos Natl Lab, Los Alamos, NM USA.
[Phillips, Jason J.] SNL, Sandia Natl Labs, Albuquerque, NM USA.
[Warner, Kirstin F.; Remmers, Daniel L.] Naval Surface Warfare Ctr, NSWC IHD, Bethesda, MD USA.
[Hsu, Peter C.; Reynolds, John G.] LLNL, Lawrence Livermore Natl Lab, Livermore, CA USA.
RP Reyes, JA (reprint author), Appl Res Associates Inc, Tyndall AFB, FL 32403 USA.
NR 19
TC 2
Z9 2
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4799-1535-4; 978-1-4799-3963-3
PY 2013
BP 784
EP 789
PG 6
WC Computer Science, Interdisciplinary Applications; Engineering,
Electrical & Electronic; Operations Research & Management Science
SC Computer Science; Engineering; Operations Research & Management Science
GA BA0AD
UT WOS:000330768500131
ER
PT S
AU Kanaev, AV
Miller, CW
Seanor, CJ
Murray-Krezan, J
AF Kanaev, Andrey V.
Miller, Christopher W.
Seanor, Collin J.
Murray-Krezan, Jeremy
BE Henry, DJ
Lange, DA
VonBerg, DL
Rajan, SD
Walls, TJ
Young, DL
TI Situational awareness investigation using tracking and enhancement of
imagery with highly dynamic lighting conditions
SO AIRBORNE INTELLIGENCE, SURVEILLANCE, RECONNAISSANCE (ISR) SYSTEMS AND
APPLICATIONS X
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Airborne Intelligence, Surveillance, Reconnaissance (ISR)
Systems and Applications X
CY MAY 01-02, 2013
CL Baltimore, MD
SP SPIE
DE Optical Flow; Super-Resolution; image enhancement; computational imaging
ID OPTIC FLOW METHODS
AB We report on the application of Optical Flow (OF) and state-of-the art multi-frame Super-Resolution (SR) algorithms to imagery that models space objects (SOs). Specifically, we demonstrate the ability to track SOs through sequences consisting of tens of images using different OF algorithms and show dependence of the tracking accuracy on illumination condition changes and on the values of pixel displacements between neighboring images. Additionally, we demonstrate spatial acuity enhancement of the pixel limited resolution of SO motion imagery by applying a novel SR algorithm accounting for OF errors.
C1 [Kanaev, Andrey V.; Miller, Christopher W.] US Naval Res Lab, 4550 Overlook Ave, Washington, DC 20032 USA.
[Seanor, Collin J.; Murray-Krezan, Jeremy] Air Force Res Lab, Kirtland AFB, NM 87117 USA.
RP Kanaev, AV (reprint author), US Naval Res Lab, 4550 Overlook Ave, Washington, DC 20032 USA.
NR 13
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9504-4
J9 PROC SPIE
PY 2013
VL 8713
AR UNSP 87130S
DI 10.1117/12.2016393
PG 22
WC Engineering, Electrical & Electronic; Optics; Telecommunications
SC Engineering; Optics; Telecommunications
GA BJQ20
UT WOS:000329624400023
ER
PT S
AU Bembry, W
Basgall, LE
Fenton, DL
AF Bembry, Walter
Basgall, Lance E.
Fenton, Donald L.
GP ASHRAE
TI Thermal Energy Storage for Emergency Cooling-Part 1 (RP-1387)
SO ASHRAE TRANSACTIONS 2013, VOL 119, PT 2
SE ASHRAE Transactions
LA English
DT Proceedings Paper
CT ASHRAE Annual Conference
CY JUN 22-26, 2013
CL Denver, CO
SP ASHRAE
AB A disruption of electrical power causing the lack of cooling to temperature sensitive equipment (for example, internet data centers) can cause failure in a matter of several minutes or less. The availability of appropriately designed and built emergency cooling systems would prevent data loss and failure of the equipment. The objective of this research is to develop useful and practical design methodologies for the design of emergency cooling systems. To accomplish this, ten candidate facility types were examined concerning their cooling load profile and design variables. Three of these - data center, manufacturing clean room, and specialized laboratory -were examined in greater detail in conjunction with five conceptual chilled water emergency cooling designs including chilled water and ice-storage systems. The software Transient System Simulation (TRNSYS) was used to develop and examine the transient behavior of all the chilled water and ice systems when applied to the three emergency cooling applications. From these designs and their associated cost analyses, a design methodology consisting of a general approach to cooling system type selection, component sizing, economic analysis, and design criteria was developed.
C1 [Bembry, Walter] Ceram Environm, Overland Pk, KS 66013 USA.
[Basgall, Lance E.] US Air Force, Vandenberg, CA USA.
[Fenton, Donald L.] Kansas State Univ, Mech & Nucl Engn Dept, Manhattan, KS 66506 USA.
RP Bembry, W (reprint author), Ceram Environm, Overland Pk, KS 66013 USA.
NR 17
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC HEATING, REFRIGERATING AND AIR-CONDITIONING ENGS
PI ATLANTA
PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 USA
SN 0001-2505
BN 978-1-936504-54-1
J9 ASHRAE TRAN
PY 2013
VL 119
BP 63
EP 75
PN 2
PG 13
WC Thermodynamics; Construction & Building Technology
SC Thermodynamics; Construction & Building Technology
GA BJM27
UT WOS:000329089700006
ER
PT S
AU Basgall, LE
Bembry, W
Fenton, DL
AF Basgall, Lance E.
Bembry, Walter
Fenton, Donald L.
GP ASHRAE
TI Thermal Energy Storage for Emergency Cooling-Part 2 (RP-1387)
SO ASHRAE TRANSACTIONS 2013, VOL 119, PT 2
SE ASHRAE Transactions
LA English
DT Proceedings Paper
CT ASHRAE Annual Conference
CY JUN 22-26, 2013
CL Denver, CO
SP ASHRAE
AB A disruption of electrical power causing the lack of cooling to temperature sensitive equipment (for example, internet data centers) can cause failure in a matter of several minutes or less. The availability of appropriately designed and built emergency cooling systems would prevent data loss and failure of the equipment. The objective of this research is to develop useful and practical design methodologies for the design of emergency cooling systems. To accomplish this, ten candidate facility types were examined concerning their cooling load profile and design variables. Three of these - data center, manufacturing clean room, and specialized laboratory -were examined in greater detail in conjunction with five conceptual chilled water emergency cooling designs, including chilled water and ice-storage systems. The software Transient System Simulation (TRNSYS) was used to develop and examine the transient behavior of all the chilled water systems when applied to the three emergency cooling applications. From these designs and their associated cost analyses, a design methodology consisting of a general approach to cooling system type selection, component sizing, economic analysis, and design criteria was developed.
C1 [Basgall, Lance E.] US Air Force, Vandenberg AFB, CA USA.
[Bembry, Walter] Ceram Environm, Overland Pk, KS USA.
[Fenton, Donald L.] Kansas State Univ, Mech & Nucl Engn Dept, Manhattan, KS 66506 USA.
RP Basgall, LE (reprint author), US Air Force, Vandenberg AFB, CA USA.
NR 5
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC HEATING, REFRIGERATING AND AIR-CONDITIONING ENGS
PI ATLANTA
PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 USA
SN 0001-2505
BN 978-1-936504-54-1
J9 ASHRAE TRAN
PY 2013
VL 119
BP 76
EP 88
PN 2
PG 13
WC Thermodynamics; Construction & Building Technology
SC Thermodynamics; Construction & Building Technology
GA BJM27
UT WOS:000329089700007
ER
PT J
AU Emerson, R
Lawrence, B
Montgomery, A
Safriet, S
AF Emerson, R.
Lawrence, B.
Montgomery, A.
Safriet, S.
BE Bakis, CE
TI Improvements to the Processing and Characterization of Needled Composite
Laminates
SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES
LA English
DT Proceedings Paper
CT 28th Technical Conference of the American-Society-for-Composites
CY SEP 09-11, 2013
CL Penn State Univ, Dept Engn Sci & Mech, State College, PA
SP Amer Soc Composites
HO Penn State Univ, Dept Engn Sci & Mech
ID MECHANICAL-PROPERTIES; PRECURSOR; PROPERTY
AB In the present investigation novel needle-processed S2-glass laminates are fabricated and several key failure modes are characterized. Double cantilever beam testing shows that mode I fracture toughness improves up to 270% compared to non-needled baseline material. In-plane compressive strength of needled material improves by up to 475%. In plane tensile strength shows mixed results, improving by 6% for moderate volume fractions of through-thickness reinforcement (TTR) and decreasing by 6% at larger volume fractions. Double lap shear tests show that interlaminar shear strength improves as much as 17% for TTR inserted at +/- 45 degrees relative to the laminate plane.
X-ray micro-computed tomography (micro-CT) is used to investigate the unique 3D microstructure resulting from the needling process for 90 degrees TTR samples. The micro-CT reconstructions show that the dimensions of the disturbances of the in-plane fabric are significantly smaller than those imparted by the conventional tufting or stitching processes at each penetration site. Micro-CT reveals that some penetration sites are aggregates of closely spaced neighbors, resulting from the lack of precise spatial control with the needling process used in the present research. At these aggregate locations the in-plane disturbances are roughly equal in size to those from tufting/stitching.
Modifications to the automated processing equipment are shown and discussed. The modifications allow better spatial control at the penetration sites and the ability to insert TTR at +/- 45 degrees relative to the laminate plane.
C1 [Emerson, R.] US Army Res Lab, RDRL WMM A, Aberdeen Proving Ground, MD 21005 USA.
[Lawrence, B.] Bowhead Sci & Technol, Belcamp, MD 21017 USA.
[Montgomery, A.] Sci & Math Acad, Aberdeen Proving Ground, MD 21005 USA.
[Safriet, S.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Emerson, R (reprint author), US Army Res Lab, RDRL WMM A, Aberdeen Proving Ground, MD 21005 USA.
NR 11
TC 0
Z9 0
U1 0
U2 6
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-107-2
PY 2013
PG 12
WC Materials Science, Composites
SC Materials Science
GA BJN63
UT WOS:000329309500065
ER
PT J
AU Iarve, E
Mollenhauer, D
Breitzman, T
Hoos, K
Swindeman, M
AF Iarve, E.
Mollenhauer, D.
Breitzman, T.
Hoos, K.
Swindeman, M.
BE Bakis, CE
TI Statistical Aspects of Progressive Fiber Failure Simulation in Composite
Laminates
SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES
LA English
DT Proceedings Paper
CT 28th Technical Conference of the American-Society-for-Composites
CY SEP 09-11, 2013
CL Penn State Univ, Dept Engn Sci & Mech, State College, PA
SP Amer Soc Composites
HO Penn State Univ, Dept Engn Sci & Mech
ID STRENGTH PREDICTION; DELAMINATION; DAMAGE; WEIBULL
AB Statistics of the open hole tensile strength for two quasi-isotropic IM7/5250-4 laminates [45/0/-45/90](s) ("A" laminate) and [0/45/90/-45](s) ("B" laminate) was simulated by using discrete damage modeling (DDM) methodology and compared to experimental data. Regularized Extended Finite Element Method (Rx-FEM) was used for matrix cracking simulation along with cohesive zone models for delamination simulation. Critical failure volume (CFV) method [1,2] was used for fiber failure simulation. Baseline strength prediction with uniform stiffness and strength ply properties was performed and showed good agreement with experimental data both in terms of ultimate strength values as well as damage patterns compared to X-ray images. Statistical variation of ply properties was then introduced by randomly varying spatial distribution of matrix tensile and shear strength in each ply thus affecting the matrix crack locations and in-particular the locations of the splits in the 00 plies. The average values of predicted variation of the open hole tensile strength was in agreement with the average values measured experimentally for laminate "B" and higher than experimental for laminate "A" by 9%. Studies of the effects of additional parameters on the scatter of strength observed in the simulations are underway.
C1 [Iarve, E.; Hoos, K.; Swindeman, M.] Univ Dayton, Res Inst, 300 Coll Pk, Dayton, OH 45469 USA.
[Mollenhauer, D.; Breitzman, T.] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Iarve, E (reprint author), Univ Dayton, Res Inst, 300 Coll Pk, Dayton, OH 45469 USA.
FU University of Dayton Research Institute, Dayton OH AF
[FA8650-10-D-5011]; Air Force Research Laboratory, Composites Branch
FX The work was performed under the University of Dayton Research
Institute, Dayton OH AF Contract FA8650-10-D-5011 with the Air Force
Research Laboratory, Composites Branch.
NR 12
TC 0
Z9 0
U1 0
U2 6
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-107-2
PY 2013
PG 13
WC Materials Science, Composites
SC Materials Science
GA BJN63
UT WOS:000329309500050
ER
PT J
AU Lu, YC
Wheeler, R
Tandon, GP
Schoeppner, GA
AF Lu, Y. C.
Wheeler, R.
Tandon, G. P.
Schoeppner, G. A.
BE Bakis, CE
TI In-Situ Micro-Compression Testing for Characterizing Failure of
Unidirectional Fiber Composites
SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES
LA English
DT Proceedings Paper
CT 28th Technical Conference of the American-Society-for-Composites
CY SEP 09-11, 2013
CL Penn State Univ, Dept Engn Sci & Mech, State College, PA
SP Amer Soc Composites
HO Penn State Univ, Dept Engn Sci & Mech
ID PLASTICITY
AB A novel in-situ compression test has been developed to characterize the failure behavior of a fiber reinforced composite at the micro-scale. The material used was carbon fiber reinforced bismaleimide matrix unidirectional composite with a fiber volume fraction of 60%. Micron-size specimens were prepared from the bulk composite through a two-step micro-fabrication process. First, a pre-patterned stencil mask was placed on the surface of the composite and co-sputtered using a broad ion beam milling system which produced an array of small pillars. Secondly, these pillars were transferred into a scanning electron microscope (SEM) and serially milled using the focused ion beam (FIB) into various micron-size specimens. In-situ compression tests were conducted using a custom micromechanical testing device placed inside the SEM chamber. The micron-size specimens were compressed by a conical indenter with a flat end surface. During compression, high resolution SEM images were acquired continuously between displacement intervals to analyze the deformation phenomena. The images were further analyzed in conjunction with digital image correlation (DIC) technique to compute quantitative strain values. Results show that, under compression, high shear strains developed in polymer matrix between the fibers. The high shear strains caused micro-cracking of the matrix. Once the matrix failed, the fibers were seen to bend in shear mode, which ultimately led to the failure of the composite.
C1 [Lu, Y. C.] Univ Kentucky, Dept Mech Engn, Lexington, KY 40506 USA.
[Wheeler, R.] Micro Testing Solut LLC, Hilliard, OH 43026 USA.
[Tandon, G. P.; Schoeppner, G. A.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Tandon, G. P.] Univ Dayton, Res Inc, Dayton, OH 45469 USA.
RP Lu, YC (reprint author), Univ Kentucky, Dept Mech Engn, Lexington, KY 40506 USA.
NR 10
TC 0
Z9 0
U1 1
U2 4
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-107-2
PY 2013
PG 9
WC Materials Science, Composites
SC Materials Science
GA BJN63
UT WOS:000329309500066
ER
PT J
AU Mollenhauer, D
Breitzman, T
Iarve, E
Hoos, K
Swindeman, M
Zhou, E
AF Mollenhauer, D.
Breitzman, T.
Iarve, E.
Hoos, K.
Swindeman, M.
Zhou, E.
BE Bakis, CE
TI Micro-Level Simulation of Mode I Fracture in Polymer Matrix Composites
SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES
LA English
DT Proceedings Paper
CT 28th Technical Conference of the American-Society-for-Composites
CY SEP 09-11, 2013
CL Penn State Univ, Dept Engn Sci & Mech, State College, PA
SP Amer Soc Composites
HO Penn State Univ, Dept Engn Sci & Mech
ID REPRESENTATIVE VOLUME ELEMENTS; DAMAGE; MICROSTRUCTURES; DELAMINATION;
CRACKING
AB Recently, simulation of damage evolution in laminated composites has been approached by representing matrix damage in a discrete manner. That is, matrix cracks are modeled explicitly in a mesh-independent manner and are allowed to interact with each other and with delaminations between plies. Typically, the crack and delamination growth in these models is governed by a mixed-mode cohesive traction-separation relationship, populated by empirically obtained mode I and mode II fracture toughness and transverse tension, compression, and shear strengths. Empirical testing to obtain these parameters can be expensive and restricts the ability to evaluate many combinations of resin and fiber in the design process. A multi-scale simulation approach to offset some empirical testing is desired. The primary approach for multi-scale failure prediction in composite materials is the continuum damage mechanics method (CDM) where the effect of damage at each length scale is manifest by local stiffness degradation at a coarser length scale. CDM is an attractive technique due to its intuitiveness and the ease of implementation. One drawback of this method is its inability to accurately describe the local effects of interaction of various damage modes and local effects of stress redistribution in the damaged area. Alternatively, multi-scale composite damage simulation may be approached by explicitly modeling matrix damage at the microscale and extracting lamina-level fracture properties for use in discrete damage simulations at the lamina/laminate-levels. The aim of this research is to use a computational framework at the micro-scale using discrete, arbitrary cracks in resin zones between fibers and cohesive zone disbonding between fibers and resin. The short-term goal of the present research is to evaluate the simulation of mode I damage evolution using discrete crack representations and/or CDM damage representations. In the longer-term, the approach(es) deemed best will be applied to mode II/III loading cases as well as the mode I.
C1 [Mollenhauer, D.] Air Force Res Lab, 2941 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Breitzman, T.; Iarve, E.; Hoos, K.; Swindeman, M.; Zhou, E.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
RP Mollenhauer, D (reprint author), Air Force Res Lab, 2941 Hobson Way, Wright Patterson AFB, OH 45433 USA.
FU AFOSR
FX This work was funded by an AFOSR grant, program manager Dr. David
Stargel
NR 15
TC 0
Z9 0
U1 0
U2 4
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-107-2
PY 2013
PG 14
WC Materials Science, Composites
SC Materials Science
GA BJN63
UT WOS:000329309500014
ER
PT J
AU Ranatunga, V
Clay, S
AF Ranatunga, V.
Clay, S.
BE Bakis, CE
TI Estimation of the Remaining Strength of a Z-Pinned Composite Laminate
with a Fully-Developed Crack through the Z-Pin Field
SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES
LA English
DT Proceedings Paper
CT 28th Technical Conference of the American-Society-for-Composites
CY SEP 09-11, 2013
CL Penn State Univ, Dept Engn Sci & Mech, State College, PA
SP Amer Soc Composites
HO Penn State Univ, Dept Engn Sci & Mech
ID II DELAMINATION TOUGHNESS; MODE; TESTS
AB Z-pins are small diameter carbon rods inserted through the thickness of composites to improve the out-of-plane properties of laminates and joints. Z-pinning technology has successfully transitioned to a few applications through extensive experimental certification programs. In order to gain a better understanding of the load-carrying capacity of a damaged composite with z-pinning, a delamination crack was grown through the entire z-pin field using the three-point bend setup, forcing the initially bonded sub-laminates held only by the z-pins. Experimental investigations revealed that the fracture toughness under Mode-II loading has been increased by 45% with the introduction of z-pins. Additionally, even with a complete delamination, the load-carrying capacity under Mode-I loading was not affected due to the presence of z-pins.
C1 [Ranatunga, V.] Miami Univ, 4200 E Univ Blvd, Middletown, OH 45042 USA.
[Clay, S.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Ranatunga, V (reprint author), Miami Univ, 4200 E Univ Blvd, Middletown, OH 45042 USA.
NR 18
TC 0
Z9 0
U1 0
U2 1
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-107-2
PY 2013
PG 12
WC Materials Science, Composites
SC Materials Science
GA BJN63
UT WOS:000329309500021
ER
PT J
AU Schutte, JF
Meeker, JC
Adams, DO
Bullegas, G
Clay, SB
AF Schutte, J. F.
Meeker, J. C.
Adams, D. O.
Bullegas, G.
Clay, S. B.
BE Bakis, CE
TI Numerical Correlation and Strength Prediction of a Hat Stiffened Panel
Compression Test
SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES
LA English
DT Proceedings Paper
CT 28th Technical Conference of the American-Society-for-Composites
CY SEP 09-11, 2013
CL Penn State Univ, Dept Engn Sci & Mech, State College, PA
SP Amer Soc Composites
HO Penn State Univ, Dept Engn Sci & Mech
AB Aerospace industry primes have indicated that improvements to current methods for characterizing damage tolerance of full-scale composite structures are needed. To address this need, a methodology is being developed that utilizes experimental results correlated with analysis models to enable a reduction in time and funding resources required to demonstrate that damage tolerance requirements of a composite structure have been met. The subject of the work outlined in this document was a scale-up effort, extending the scope of traditional coupon level experimental and analysis approaches to include larger representative structural elements. This effort is intended to lay the foundation for designing a modified damage tolerance test procedure that more closely replicates loads and failure modes observed in composite airframe and nacelle structures. Once validated, this combined experimental/analysis approach should significantly reduce the number of tests required for airframe designers to demonstrate damage tolerance of composite structures. This paper outlines part of the validation effort undertaken to correlate a finite element (FE) nonlinear buckling analyses (in ABAQUS) incorporating a user defined nonlinear material subroutine (UMAT). This numerical modeling framework was applied to capture the post-buckling response and final collapse of a hat stiffened panel with machined damage subjected to an in-plane compression load.
C1 [Schutte, J. F.; Meeker, J. C.] Mat Sci Corp, Horsham, PA 19044 USA.
[Adams, D. O.] Univ Utah, Salt Lake City, UT 84112 USA.
[Bullegas, G.] San Diego State Univ, San Diego, CA 92182 USA.
[Clay, S. B.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Schutte, JF (reprint author), Mat Sci Corp, Horsham, PA 19044 USA.
NR 7
TC 0
Z9 0
U1 1
U2 1
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-107-2
PY 2013
PG 14
WC Materials Science, Composites
SC Materials Science
GA BJN63
UT WOS:000329309500105
ER
PT J
AU Derriso, MM
Desimio, MP
Mccurry, CD
Kabban, CMS
Olson, SE
AF Derriso, M. M.
Desimio, M. P.
Mccurry, C. D.
Kabban, C. M. S.
Olson, S. E.
BE Chang, FK
TI Industrial Age NDE to Information Age SHM
SO STRUCTURAL HEALTH MONITORING 2013, VOLS 1 AND 2
LA English
DT Proceedings Paper
CT 9th International Workshop on Structural Health Monitoring (IWSHM)
CY SEP 10-12, 2013
CL Stanford Univ, Stanford, CA
SP AF Off Sci Res, Army Res Lab, Off Naval Res, Boeing, Airbus, Embraer
HO Stanford Univ
AB The United States Air Force (USAF) is transforming its maintenance practices from the Industrial Age to the Information Age by exploiting opportunities and benefits offered by Information Age technology and techniques. The USAF currently manages its aircraft using a schedule-based maintenance philosophy. This schedule-based approach works well for ensuring aircraft integrity; however, it is very costly, labor-intensive, and reduces aircraft availability. Structural Health Monitoring (SHM) systems have the potential to analyze near-real-time and historical weapon systems data to provide a predictive maintenance capability. However, most research in SHM is focused on in-situ structural inspection techniques instead of structural monitoring. Structural inspections typically entail examining key locations of the airframe for material degradation or flaws. These examinations usually occur at predefined intervals between extended periods of time with each inspection considered an independent evaluation. Conversely, structural monitoring involves continuous condition surveillance of an airframe over an extended period of time. It uses past conditions and expected future conditions for producing a comprehensive understanding of the current health state. In this paper, the full potential impact SHM could have on airframe management is examined. As demonstrated in a laboratory experiment, SHM has the potential to improve effectiveness and efficiency metrics compared to the current USAF maintenance procedures.
C1 [Derriso, M. M.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Derriso, MM (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 8
TC 0
Z9 0
U1 1
U2 2
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-115-7
PY 2013
BP 15
EP 26
PG 12
WC Engineering, Civil; Engineering, Mechanical
SC Engineering
GA BJN59
UT WOS:000329292700002
ER
PT J
AU Kabban, CMS
King, AS
Derriso, MM
AF Kabban, C. M. Schubert
King, A. S.
Derriso, M. M.
BE Chang, FK
TI A Notional Framework and Model to Improve Monitoring of Structural
Health Systems
SO STRUCTURAL HEALTH MONITORING 2013, VOLS 1 AND 2
LA English
DT Proceedings Paper
CT 9th International Workshop on Structural Health Monitoring (IWSHM)
CY SEP 10-12, 2013
CL Stanford Univ, Stanford, CA
SP AF Off Sci Res, Army Res Lab, Off Naval Res, Boeing, Airbus, Embraer
HO Stanford Univ
AB Structural health monitoring (SHM) systems have rapidly advanced, embracing both technological advances and real-time, in situ monitoring. Such advances are paramount to maintaining structural integrity. Capitalizing on continual data collection, however, SHM systems can reach beyond detection of structural damage to include the development and prediction of time to critical failure. Due to this increased capability, it is inherent that SHM systems capture information differently than current inspection methods. We advocate the increased capability of the SHM system as a difference between assessing a structure and monitoring a structure.
This work introduces a framework with which the data captured in the monitoring of structural health is leveraged in order to improve not only the prediction of the state of the structure (presence of damage and extent of damage), but also the estimated time to failure. A statistical model is presented to represent the generalized framework. This model estimates the time to critical crack length in a hierarchal model such that the time until critical crack length occurs is modeled as a function of current crack status, that is, crack length and location. Crack length and location are themselves a joint response modeled from available sensor output and potentially other various environmental or sensor-related measurements. The necessary joint modeling of length (horizontal and vertical) and location allows us to incorporate the inherent correlation between these as part of the estimation process. These estimates are then used to predict the time until failure (critical crack length is achieved). By modeling in this hierarchal fashion, the current and past state of the structure, as well as changes in the structure during the course of monitoring, may be used to more precisely estimate the remaining life, that is, the time until structural failure may occur. Simulated and preliminary data from current specimens will be used to demonstrate these methods.
C1 [Kabban, C. M. Schubert; King, A. S.] US Air Force, Dept Math & Stat, AFIT ENC, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Kabban, CMS (reprint author), US Air Force, Dept Math & Stat, AFIT ENC, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
NR 19
TC 0
Z9 0
U1 1
U2 2
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-115-7
PY 2013
BP 1337
EP 1344
PG 8
WC Engineering, Civil; Engineering, Mechanical
SC Engineering
GA BJN59
UT WOS:000329292700163
ER
PT B
AU Naik, RR
Jones, EW
AF Naik, Rajesh R.
Jones, Elizabeth W.
BE Rawlings, ND
Salvesen, GS
TI Cerevisin
SO HANDBOOK OF PROTEOLYTIC ENZYMES, VOLS 1 AND 2, 3RD EDITION
LA English
DT Article; Book Chapter
ID YEAST SACCHAROMYCES-CEREVISIAE; PROTEINASE-DEFICIENT MUTANTS; PROTEASE
MAJOR ALLERGEN; IMMUNOLOGICAL CHARACTERIZATION; CHITIN SYNTHETASE;
ACTIVATING FACTOR; STRUCTURAL GENE; B PRECURSOR; PURIFICATION;
IDENTIFICATION
C1 [Naik, Rajesh R.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Jones, Elizabeth W.] Carnegie Mellon Univ, Dept Biol Sci, Mellon Inst, Pittsburgh, PA 15213 USA.
RP Naik, RR (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM ej09@andrew.cmu.edu
NR 44
TC 0
Z9 0
U1 0
U2 0
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
BN 978-0-12-382220-8; 978-0-12-382219-2
PY 2013
BP 3233
EP 3236
DI 10.1016/B978-0-12-382219-2.00712-2
PG 4
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA BJJ95
UT WOS:000328545105017
ER
PT S
AU Bochove, EJ
Nair, N
Aceves, AB
Zunoubi, MR
AF Bochove, Erik J.
Nair, Niketh
Aceves, Alejandro B.
Zunoubi, Mohammad R.
BE Exarhos, GJ
Gruzdev, VE
Menapace, JA
Ristau, D
Soileau, MJ
TI New Tools for the Dynamical Description of Laser Arrays and Other
Complex Systems
SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2013
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT 45th Annual Laser Damage Symposium on Laser-Induced Damage in Optical
Materials
CY SEP 22-25, 2013
CL Boulder, CO
SP SPIE, Lawrence Livermore Natl Lab, Spica Technologies Inc
DE Phased Laser Arrays; Laser Beam Quality; Neural Nets; Dynamical Systems
ID COHERENCE
AB We propose a systematic approach that may apply to many complex interactive networks, such as biological or electronic neural assemblies, which was partly inspired by mathematical features of phased laser arrays. Using an appropriate quasi-logarithmic transformation, a Fox-Li integral equation of linearly coupled phased laser arrays is mapped to a semi-equivalent coupled oscillator description, of which the interaction term is decomposed into orthogonal projections. Based on traditional ideas of symmetry, orthogonality, completeness, and the physical concept of criticality, techniques are proposed for the description of the dynamics and organization of massively nonlinearly interconnected networks, which may serve as memories, or perform computational operations in biological neuron assemblies, or models of evolution, pathology, ecological and social networks, individual and collective behavior, etc.
C1 [Bochove, Erik J.] Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
[Nair, Niketh] Univ Tennessee, Dept Mech Engn, Knoxville, TN 37996 USA.
[Nair, Niketh] Oak Ridge Natl Lab, Div Comp Sci & Math, Oak Ridge, TN 37831 USA.
[Aceves, Alejandro B.] So Methodist Univ, Dept Math, Dallas, TX 75275 USA.
[Zunoubi, Mohammad R.] SUNY Coll New Paltz, Dept Elect & Comp Engn, New Paltz, NY 12561 USA.
RP Bochove, EJ (reprint author), Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
FU AFOSR
FX This project was funded by the AFOSR (program of A. Nachman).
NR 16
TC 0
Z9 0
U1 0
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9753-6
J9 PROC SPIE
PY 2013
VL 8885
AR UNSP 88851H
DI 10.1117/12.2031604
PG 8
WC Optics; Physics, Applied
SC Optics; Physics
GA BJM57
UT WOS:000329160900029
ER
PT S
AU Bochove, EJ
Zunoubi, MR
Corcoran, CJ
AF Bochove, Erik J.
Zunoubi, Mohammad R.
Corcoran, Christopher J.
BE Exarhos, GJ
Gruzdev, VE
Menapace, JA
Ristau, D
Soileau, MJ
TI Theory of Phase-Locking of Multi-Stable Fiber Amplifier Arrays
SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2013
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT 45th Annual Laser Damage Symposium on Laser-Induced Damage in Optical
Materials
CY SEP 22-25, 2013
CL Boulder, CO
SP SPIE, Lawrence Livermore Natl Lab, Spica Technologies Inc
DE fiber lasers and amplifiers; beam combining
ID LASER ARRAYS; HIGH-POWER
AB We solve the time-independent (o.d.e.) propagation equations for the c.w. operation of an array of externally coupled fiber amplifiers with internal reflection, in which Kerr and resonant nonlinearities play a part. A transcendental equation for each amplifier is obtained, collectively yielding multiple distinct array solutions, which are characterized in terms of their mutual phase coherence. We find that the two types of nonlinearity (Kerr and resonant) affect the solutions in distinct parameter regimes. The relation of Strehl ratio to output power at fixed wavelength and feedback level reveals that phase-locking may occur due to nonlinearity as opposed to mode selection, in accordance with recent experiments (H-S Chiang, J.R. Leger, J. Nilsson and J. Sahu, Optics Letters (2013)). The individual lasing instability ("rogue" lasing) anticipated by A. E. Siegman in 2004 we observed only at low feedback levels in a small number of cases.
C1 [Bochove, Erik J.] Air Force Res Lab, Directed Energy Directorate, Albuquerque, NM 87117 USA.
[Zunoubi, Mohammad R.] SUNY Coll New Paltz, Dept Elect & Comp Engn, New Paltz, NY 12561 USA.
[Corcoran, Christopher J.] Corcoran Engn Inc, Waltham, MA 02453 USA.
RP Bochove, EJ (reprint author), Air Force Res Lab, Directed Energy Directorate, Albuquerque, NM 87117 USA.
FU JTO; AFOSR
FX The authors appreciate financial support from the JTO and the AFOSR (A.
Nachman).
NR 17
TC 0
Z9 0
U1 1
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9753-6
J9 PROC SPIE
PY 2013
VL 8885
AR UNSP 888515
DI 10.1117/12.2031605
PG 7
WC Optics; Physics, Applied
SC Optics; Physics
GA BJM57
UT WOS:000329160900022
ER
PT J
AU Derriso, MM
Little, JE
Vehorn, KA
Davies, MJ
Desimio, MP
AF Derriso, M. M.
Little, J. E., II
Vehorn, K. A.
Davies, M. J.
Desimio, M. P.
BE Chang, FK
TI Crack Detection Using Combinations of Acoustic Emission and Guided Wave
Signals from Bonded Piezoelectric Transducers
SO STRUCTURAL HEALTH MONITORING 2011: CONDITION-BASED MAINTENANCE AND
INTELLIGENT STRUCTURES, VOL 2
SE Structural Health Monitoring
LA English
DT Proceedings Paper
CT 8th International Workshop on Structural Health Monitoring
CY SEP 13-15, 2011
CL Stanford Univ, Stanford, CA
SP AF Off Sci Res, Army Res Off, Natl Sci Fdn, Off Naval Res
HO Stanford Univ
AB Piezoelectric transducers are broadband devices and can operate over a large frequency range. In structural health monitoring (SHM) applications, piezoelectric transducers are commonly operated at ultrasonic frequencies to excite and sense guided waves, detect acoustic emission (AE) events, and record electro-mechanical impedance (EMI). The transducers can also measure lower frequency information, such as strains resulting from operational loads or vibrations due to environmental factors. This paper presents a crack detection experiment using piezoelectric transducers to provide signals measuring guided waves, AE events, EMI, and strain. The experimental test articles are aluminum dogbone coupons. Each coupon has a small hole drilled in the gage section to serve as a crack initiation point. Each coupon is instrumented with two transducers, both on the same face of the coupon and on either side of the gage section. Each coupon undergoes cyclic tensile loading to initiate and grow fatigue cracks. At various intervals, the fatigue cycling is paused and the coupon is visually inspected for crack initiation and growth. While the cycling is paused, guided waves are generated and sensed by the pair of transducers; each being used in turn as a transmitter or receiver. In addition, EMI measurements at each transducer are made with the cycling paused. Ideally, AE and strain measurements would be made continuously during the cycling. However, for these studies the available hardware did not allow continuous collection of data. As a result, the AE and strain measurements also are taken over limited time segments while the primary fatigue cycling is paused. Collection of data for the various sensing modes continues as the crack grows to the point of coupon fracture. Baseline crack detection performance is established using statistical pattern recognition methods applied to the guided wave data. Additional crack detection algorithms are designed and evaluated to demonstrate the potential benefits of using decision fusion methods applied to combinations of guided wave and AE data. Artificial AE data has been utilized since the current testing hardware did not allow for the collection of useful AE data. Future studies will address the collection of AE data and consider data fusion incorporating EMI and/or strain data.
C1 [Derriso, M. M.; Little, J. E., II; Vehorn, K. A.] Air Vehicles Directorate, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Derriso, MM (reprint author), Air Vehicles Directorate, Air Force Res Lab, 2790 D St, Wright Patterson AFB, OH 45433 USA.
NR 14
TC 0
Z9 0
U1 0
U2 4
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-053-2
J9 STRUCT HLTH MONIT
PY 2013
BP 1986
EP 1993
PG 8
WC Engineering, Multidisciplinary
SC Engineering
GA BJH31
UT WOS:000328194500078
ER
PT J
AU Lindgren, EA
Buynak, CF
AF Lindgren, E. A.
Buynak, C. F.
BE Chang, FK
TI The Need and Requirements for Validating Damage Detection Capability
SO STRUCTURAL HEALTH MONITORING 2011: CONDITION-BASED MAINTENANCE AND
INTELLIGENT STRUCTURES, VOL 2
SE Structural Health Monitoring
LA English
DT Proceedings Paper
CT 8th International Workshop on Structural Health Monitoring
CY SEP 13-15, 2011
CL Stanford Univ, Stanford, CA
SP AF Off Sci Res, Army Res Off, Natl Sci Fdn, Off Naval Res
HO Stanford Univ
AB Structural Health Monitoring (SHIM) has been proposed to benefit the maintenance cost and reliability of aircraft structures through the early detection of damage during service and in support of condition-based maintenance. At the same time, if the integrity of an aircraft component is dependent upon the performance of an SHIM system to detect damage, which has recently been referred to as an in-situ NDE system by two airframe OEMs [1,2], the reliability of the validated capability of the SHM system must also be ensured over the service life of the aircraft. To enable the calculation of risk, which is the metric used by the US Air Force (USAF) to manage the integrity of structures, the capability of any inspection process must be assessed and integrated into the risk calculation. Thus, a qualification plan is required for both the validated capability, i.e. POD and false-positive rate, and the durability of the sensing technique. These requirements were established by the Aircraft Structural Integrity Program (ASIP) Senior Leader for the USAF, Mr. Charles Babish [3]. Empirical assessment of the performance of an SHM system in such an environment is not a trivial manner and could readily be cost prohibitive. A protocol has been developed at the request of the AFRL Team Leader for Integrated System Health Assessment initiative that leverages current research and development efforts to minimize the amount of empirical data required for assessing the Probability of Detection (POD) of a damage detection system [4]. The on-going effort uses models and transfer functions to minimize the need for empirical data and is called Model-assisted Probability of Detection, or MAPOD [5,6]. The details defining these requirements and structure for the protocol to satisfy these requirements are presented.
C1 [Lindgren, E. A.; Buynak, C. F.] US Air Force, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Lindgren, EA (reprint author), US Air Force, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 17
TC 0
Z9 0
U1 0
U2 1
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-053-2
J9 STRUCT HLTH MONIT
PY 2013
BP 2444
EP 2451
PG 8
WC Engineering, Multidisciplinary
SC Engineering
GA BJH31
UT WOS:000328194500133
ER
PT J
AU Medina, EA
Aldrin, JC
Santiago, J
Lindgren, EA
Buynak, CF
Knopp, JS
AF Medina, E. A.
Aldrin, J. C.
Santiago, J.
Lindgren, E. A.
Buynak, C. F.
Knopp, J. S.
BE Chang, FK
TI Demonstration of Model Assisted Reliability Assessment Protocol on a
Proposed Low Frequency Vibration Based Damage Sensing Case
SO STRUCTURAL HEALTH MONITORING 2011: CONDITION-BASED MAINTENANCE AND
INTELLIGENT STRUCTURES, VOL 2
SE Structural Health Monitoring
LA English
DT Proceedings Paper
CT 8th International Workshop on Structural Health Monitoring
CY SEP 13-15, 2011
CL Stanford Univ, Stanford, CA
SP AF Off Sci Res, Army Res Off, Natl Sci Fdn, Off Naval Res
HO Stanford Univ
AB This paper describes the progress on demonstrating a methodology for reliability assessment for structural damage sensing (SDS) systems. In particular, it presents the initial results obtained from the application of a protocol designed for utilizing empirical data, models, simulations, and uncertainty analyses for statistically characterizing SDS reliability for a damage detection case. The manufactured test article representing an aircraft structure of medium complexity consists of three plates connected by two lap joints with fasteners. Fatigue crack damage around the fastener holes was simulated by manually created thin cuts at selected locations. The test fixture design provides the capability to vary critical parameters of the system with a focus on force loading boundary conditions, joint fastener torque conditions, and temperature. The initial demonstration on this test article and fixture uses a low frequency vibration based damage detection method. Frequency domain metrics were utilized for studying changes in structural dynamics due to mechanical loading, thermal loading, and actual damage. For the demonstration, key factors that affect the capability to sense the effects of damage were assessed through controlled studies of (a) loading and unloading, (b) fastener torque, (c) boundary condition variation, (d) temperature variation and temperature gradients, (e) sensor bond quality and operation performance, (f) ambient noise, and (g) sensitivity to flaw growth. The design of the full validation study and the current results of the implementation are presented, highlighting general protocol feasibility while identifying remaining challenges for full demonstration and broad use of the methodology and protocol.
C1 [Medina, E. A.; Lindgren, E. A.; Buynak, C. F.; Knopp, J. S.] Air Force Res Lab, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Medina, EA (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 7
TC 0
Z9 0
U1 0
U2 3
PU DESTECH PUBLICATIONS, INC
PI LANCASTER
PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA
BN 978-1-60595-053-2
J9 STRUCT HLTH MONIT
PY 2013
BP 2460
EP 2467
PG 8
WC Engineering, Multidisciplinary
SC Engineering
GA BJH31
UT WOS:000328194500135
ER
PT J
AU Huscroft, JR
Hazen, BT
Hall, DJ
Skipper, JB
Hanna, JB
AF Huscroft, Joseph R.
Hazen, Benjamin T.
Hall, Dianne J.
Skipper, Joseph B.
Hanna, Joe B.
TI Reverse logistics: past research, current management issues, and future
directions
SO INTERNATIONAL JOURNAL OF LOGISTICS MANAGEMENT
LA English
DT Article
DE Content analysis; Reverse logistics; Delphi method
ID SUPPLY CHAIN; DELPHI TECHNIQUE; PRODUCT RETURNS; INFORMATION-TECHNOLOGY;
COMPETITIVE ADVANTAGE; INVENTORY CONTROL; DESIGN; FRAMEWORK;
PERFORMANCE; OPERATIONS
AB Purpose - The purpose of this paper is to identify the key issues faced by today's supply chain professionals when managing reverse logistics (RL) processes and compare these issues with the topics examined in extant research. By making such a comparison, the paper identifies areas of practical relevance that are being adequately addressed in the literature, as well as areas that may need further attention.
Design/methodology/approach - The paper employed a Delphi method in order to uncover the most salient RL issues faced in industry, as viewed by practitioners. The paper then completed a systematic analysis of the RL literature in order to examine the degree to which topics addressed in the extant literature correspond with the framework proposed by Carter and Ellram (1998). Finally, the paper compared and contrasted the findings of the content analysis and Delphi study, which highlights areas for future investigation that may help to better align research with practice.
Findings - In the Delphi study, the paper uncovered and ranked seven key issues for RL managers. These are: customer support, top-management support, communication, costs, formalization, timing of operations, and environmental issues. When compared to Carter and Ellram's (1998) framework, three of the seven factors coincide with factors described in the framework and two factors indirectly relate to the framework. The two factors not specifically represented are costs and formalization.
Practical implications - The findings provide practitioners with an understanding of what factors are most important to consider when managing RL programs. The discussion of the comparison between the Delphi results and extant literature provides guidance as to how to address the RL issues uncovered in this study.
Originality/value - This research effort suggests directions for future research that will better align academic topics with current managerial issues. Although the paper offers many suggestions for future i-esearch, the paper proposes that investigating ways to increase formalization of RL programs and establish RL as a profit center within organizations may be the areas in greatest need for additional scholarly research.
C1 [Huscroft, Joseph R.] Operat Sci Air Force Inst Technol, Dayton, OH USA.
[Hazen, Benjamin T.] US Air Force, Goldsboro, NC USA.
[Hall, Dianne J.] Auburn Univ, Coll Business, Auburn, AL 36849 USA.
[Skipper, Joseph B.] US Air Force Langley AFB, Hampton, VA USA.
[Hanna, Joe B.] Auburn Univ, Aviat & Supply Chain Management Dept, Auburn, AL 36849 USA.
RP Hanna, JB (reprint author), Auburn Univ, Aviat & Supply Chain Management Dept, Auburn, AL 36849 USA.
EM hannajb@auburn.edu
OI Huscroft, Joseph/0000-0001-9585-011X
NR 101
TC 17
Z9 17
U1 9
U2 31
PU EMERALD GROUP PUBLISHING LIMITED
PI BINGLEY
PA HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND
SN 0957-4093
EI 1758-6550
J9 INT J LOGIST MANAG
JI Int. J. Logist. Manag.
PY 2013
VL 24
IS 3
BP 304
EP 327
DI 10.1108/IJLM-04-2012-0024
PG 24
WC Management
SC Business & Economics
GA 273FF
UT WOS:000328519900001
ER
PT S
AU Joyce, DM
Venkat, N
Ouchen, F
Singh, KM
Smith, SR
Grote, JG
AF Joyce, Donna M.
Venkat, Narayanan
Ouchen, Fahima
Singh, Kristi M.
Smith, Steven R.
Grote, James G.
BE Kobayashi, N
Ouchen, F
Rau, I
TI DNA hybrid dielectric film devices for energy storage and bioelectronics
applications
SO NANOBIOSYSTEMS: PROCESSING, CHARACTERIZATION, AND APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanobiosystems - Processing, Characterization, and
Applications VI
CY AUG 25-28, 2013
CL San Diego, CA
SP SPIE
DE DNA; biopolymer; bio-dielectrics; dielectric constant; sol-gel; DNA-CTMA
ID COMPOSITE
AB DNA biopolymer hybrids have been investigated for energy storage applications and also as potential high k gate dielectrics in bioelectronics applications such as BioFETs. DNA-based hybrid films incorporating sol-gel-derived ceramics have shown strong promise as insulating dielectrics for high voltage capacitor applications. Our studies of DNA-CTMA complex/sol-gel hybrid thin film devices have demonstrated reproducibility and stability in temperature-and frequency-dependent dielectric properties as well as reliability in DC voltage breakdown measurements, attaining values consistently in the 300 - 350 V/um range. We have also investigated DNA-inorganic hybrids by ex situ blending of aqueous solutions of DNA with high k ceramics such as BaTiO3 and TiO2. These systems are currently being investigated as potential gate dielectrics for BioFETs by virtue of their relatively high dielectric constant, high DC electrical resistivity, and lower leakage currents than pristine DNA. Functionally layered devices have also been designed, fabricated and characterized to determine any added benefit in dielectric applications. The electrical/dielectric characteristics of DNA and DNA-CTMA with sol-gel-derived ceramics, high k ceramic fillers, and in layered devices were examined to determine their effect on vital dielectric parameters for energy storage and bioelectronics applications.
C1 [Joyce, Donna M.; Venkat, Narayanan; Ouchen, Fahima; Singh, Kristi M.; Smith, Steven R.; Grote, James G.] AF Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Joyce, DM (reprint author), AF Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 12
TC 2
Z9 2
U1 2
U2 12
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9667-6
J9 PROC SPIE
PY 2013
VL 8817
AR UNSP 881708
DI 10.1117/12.2027714
PG 8
WC Nanoscience & Nanotechnology; Materials Science, Characterization &
Testing; Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BJI62
UT WOS:000328343900005
ER
PT S
AU Williams, A
Campbell, A
Ouchen, F
Lu, WJ
Grant, J
Grote, J
AF Williams, Adrienne
Campbell, Angela
Ouchen, Fahima
Lu, Weijie
Grant, John
Grote, James
BE Kobayashi, N
Ouchen, F
Rau, I
TI Investigation of maple-deposited DNA films for graphene-based device
applications
SO NANOBIOSYSTEMS: PROCESSING, CHARACTERIZATION, AND APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanobiosystems - Processing, Characterization, and
Applications VI
CY AUG 25-28, 2013
CL San Diego, CA
SP SPIE
AB In this study, we investigate a new technique to fabricate DNA-CTMA films with tunable properties. MAPLE is, for the first time, explored to deposit DNA-CTMA dielectric films on top of epitaxially grown graphene on silicon carbide (SiC) substrate. Silicon dioxide (SiO2) is commonly used as a gate insulator in graphene based field effect transistors (GFETs) in a top gate configuration. The high temperature deposition of SiO2 on graphene is known to cause damage to the surface of the graphene leading to poor device operation. We propose an alternative gate insulator based on a bio-organic (DNA-CTMA) material processed and deposited at room temperature (RT) using MAPLE. Hall measurements run before and after DNA-CTMA deposition showed no change in the type of conductivity as well as charge carrier mobility.
C1 [Williams, Adrienne; Campbell, Angela; Ouchen, Fahima; Lu, Weijie; Grant, John; Grote, James] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Williams, A (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 3
TC 0
Z9 0
U1 0
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9667-6
J9 PROC SPIE
PY 2013
VL 8817
AR UNSP 88170L
DI 10.1117/12.2027218
PG 5
WC Nanoscience & Nanotechnology; Materials Science, Characterization &
Testing; Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BJI62
UT WOS:000328343900013
ER
PT S
AU Mattioli, V
Marzano, FS
Pierdicca, N
Basili, P
Brost, G
Ciotti, P
AF Mattioli, V.
Marzano, F. S.
Pierdicca, N.
Basili, P.
Brost, G.
Ciotti, P.
GP IEEE
TI Modeling Radio Propagation Effects At V- and W-Band Using
Physical-Statistical Approaches and Ground-Based Data
SO 2013 7TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
SE Proceedings of the European Conference on Antennas and Propagation
LA English
DT Proceedings Paper
CT 7th European Conference on Antennas and Propagation (EuCAP)
CY APR 08-12, 2013
CL Gothenburg, SWEDEN
DE radio propagation; attenuation; cloud; rain; W-band
ID MILLIMETER-WAVE FREQUENCIES; ANTENNA NOISE TEMPERATURE; WATER-VAPOR
PROFILES; MICROWAVE RADIOMETER; RAIN CLOUDS; ATTENUATION; LINE
AB Radiosoundings data and numerical outputs from a cloud-resolving model in conjunction with a Monte Carlo statistical scheme and a radiative transfer algorithm (SNEM) are used to characterize propagation parameters at V-and W-band in Rome, NY, for any meteorological scenario including clear-air, cloudy coverage, stratiform rain and convective precipitation. The goal aimed at exploiting these databases for the design of simpler estimators of propagation parameters, as well as assessing current ITU models up to W-band in comparison with calculations from physical models.
C1 [Mattioli, V.; Marzano, F. S.; Pierdicca, N.] Univ Roma La Sapienza, Dept Informat Eng, Via Eudossiana 18, I-00184 Rome, Italy.
[Basili, P.] Univ Perugia, Elect & Informat Engn Dept, I-06125 Perugia, Italy.
[Brost, G.] US Air Force, Res Lab, Griffiss AFB, NY 13441 USA.
[Ciotti, P.] Univ LAquila, Elect & Informat Engn Dept, I-67100 Laquila, Italy.
RP Mattioli, V (reprint author), Univ Roma La Sapienza, Dept Informat Eng, Via Eudossiana 18, I-00184 Rome, Italy.
NR 28
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2164-3342
BN 978-88-907018-3-2; 978-1-4673-2187-7
J9 PROC EUR CONF ANTENN
PY 2013
BP 2287
EP +
PG 5
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BIA05
UT WOS:000327126002022
ER
PT S
AU Liebig, CM
Basun, S
Buller, SS
Evans, DR
Banerjee, PP
Blanche, PA
Christensen, CW
Peyghambarian, N
Thomas, J
AF Liebig, C. M.
Basun, S.
Buller, S. S.
Evans, D. R.
Banerjee, P. P.
Blanche, P. A.
Christensen, C. W.
Peyghambarian, N.
Thomas, J.
BE Yin, S
Guo, R
TI Enhanced gain dynamics in photorefractive polymers
SO PHOTONIC FIBER AND CRYSTAL DEVICES: ADVANCES IN MATERIALS AND
INNOVATIONS IN DEVICE APPLICATIONS VII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Photonic Fiber and Crystal Devices - Advances in Materials
and Innovations in Device Applications VII
CY AUG 25-26, 2013
CL San Diego, CA
SP SPIE
DE Photorefractives; Polymers; Two-beam coupling
AB The complexity of photorefractive polymers arises from multiple contributions to the photo-induced index grating. Analysis of the time dynamics of the two-beam coupling signal is used to extract information about the charge species responsible for the grating formation. It has been shown in a commonly used photorefractive polymer at moderate applied electric fields, the primary charge carriers (holes) establish an initial grating which, however, are followed by a subsequent competing grating (electrons) that decreases the two-beam coupling efficiency. We show by upon using higher applied bias fields, gain enhancement can be achieved by eliminating the electron grating contribution and returning to hole gratings only.
C1 [Liebig, C. M.; Basun, S.; Buller, S. S.; Evans, D. R.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Liebig, CM (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
NR 10
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9697-3
J9 PROC SPIE
PY 2013
VL 8847
AR 88470A
DI 10.1117/12.2023404
PG 6
WC Crystallography; Optics
SC Crystallography; Optics
GA BHV63
UT WOS:000326750500008
ER
PT S
AU Cao, YC
Ren, W
Casbeer, DW
Schumacher, C
AF Cao, Yongcan
Ren, Wei
Casbeer, David W.
Schumacher, Corey
GP IEEE
TI Finite-time Consensus of Networked Lipschitz Nonlinear Agents Under
Communication Constraints
SO 2013 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 17-19, 2013
CL Washington, DC
SP Boeing, Eaton, Halliburton, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, United Technologies Res Ctr, Xerox, dSpace, Journal Franklin Inst, GE Global Res, Quanser, SIAM, Springer, Taylor & Francis Grp CRC Press, Wiley
DE Consensus; Cooperative Control; Finite-time Convergence; Lipschitz
Nonlinear Dynamics; Limited Sensing Range; Nonsmooth Analysis
ID MULTIAGENT SYSTEMS; COOPERATIVE CONTROL; CONNECTEDNESS; MANIPULATORS;
COORDINATION; ALGORITHMS
AB In this paper, we study the finite-time consensus problem for a team of networked Lipschitz nonlinear agents under communication constraints, where each agent has a limited sensing range. Because the induced interaction graph is typically state-dependent and dynamic, we propose a distributed nonlinear control algorithm that is capable of preserving the initial interaction patterns. By using tools from nonsmooth analysis, we present conditions on the initial interaction graph and the control gain such that finite-time consensus can be reached. More specifically, an upper bound of the convergence time is derived via a two-step analysis.
C1 [Cao, Yongcan; Casbeer, David W.; Schumacher, Corey] Air Force Res Lab, Control Sci Ctr Excellence, Wright Patterson AFB, OH 45433 USA.
RP Cao, YC (reprint author), Air Force Res Lab, Control Sci Ctr Excellence, Wright Patterson AFB, OH 45433 USA.
OI Cao, Yongcan/0000-0003-3383-0185
NR 29
TC 2
Z9 2
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0743-1619
BN 978-1-4799-0178-4
J9 P AMER CONTR CONF
PY 2013
BP 1326
EP 1331
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BIB32
UT WOS:000327210201082
ER
PT S
AU Welker, TC
Huffman, RE
Pachter, M
AF Welker, Troy C.
Huffman, Richard E., Jr.
Pachter, Meir
GP IEEE
TI Modeling Earth's Gravitational Gradients for GPS-Free Navigation
SO 2013 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 17-19, 2013
CL Washington, DC
SP Boeing, Eaton, Halliburton, Honeywell, MathWorks, Mitsubishi Elect Res Labs, Natl Instruments, United Technologies Res Ctr, Xerox, dSpace, Journal Franklin Inst, GE Global Res, Quanser, SIAM, Springer, Taylor & Francis Grp, CRC Press, Wiley
DE INS; gravity gradiometry; accelerometer; cold atom interferometry
AB A method is developed to estimate an aircraft's navigation state using gravitational gradients calculated from a spherical harmonic model of the Earth, in concert with terrain elevation data, without using surveyed gravity information.
C1 [Welker, Troy C.] USAF, Aeronaut Syst Ctr, Wright Patterson AFB, OH USA.
RP Welker, TC (reprint author), USAF, Aeronaut Syst Ctr, Wright Patterson AFB, OH USA.
EM meir.pachter@afit.edu
NR 22
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0743-1619
BN 978-1-4799-0178-4
J9 P AMER CONTR CONF
PY 2013
BP 1602
EP 1607
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BIB32
UT WOS:000327210201126
ER
PT S
AU Pham, KD
Xu, YJ
AF Pham, Khanh D.
Xu, Yunjun
GP IEEE
TI Understanding Disturbance Attenuation Problems with Unknown Input
Time-Delays: A Game-Theoretic Approach with Performance Risk Aversion
SO 2013 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 17-19, 2013
CL Washington, DC
SP Boeing, Eaton, Halliburton, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, United Technologies Res Ctr, Xerox, dSpace, Journal Franklin Inst, GE Global Res, Quanser, SIAM, Springer, Taylor & Francis Grp CRC Press, Wiley
AB The main contribution is the application of a zero-sum game-theoretic framework and performance-measure statistics that can help robust control design to obtain a certain level of performance robustness in presence of adversarial process and measurement disturbances starting from the assumptions of linear stochastic dynamics, unknown input time-delays, a finite-horizon integral-quadratic cost and noisy output observations. A disturbance attenuation problem is based on a saddle-point equilibrium associated with the controller with performance risk aversion in competing with persistent process and measurement disturbances. The resulting saddle-point strategies are in turn supported by: i) a Kalman-like estimator for both unknown time-delays and noisy states and ii) a custom dynamical set of mathematical statistics associated with the underlying random cost of the chi-squared type.
C1 [Pham, Khanh D.] Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Pham, KD (reprint author), Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
NR 7
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0743-1619
BN 978-1-4799-0178-4
J9 P AMER CONTR CONF
PY 2013
BP 5092
EP 5097
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BIB32
UT WOS:000327210205048
ER
PT S
AU Cao, YC
Casbeer, DW
Schumacher, C
AF Cao, Yongcan
Casbeer, David W.
Schumacher, Corey
GP IEEE
TI Reaching Consensus in the Sense of Probability
SO 2013 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 17-19, 2013
CL Washington, DC
SP Boeing, Eaton, Halliburton, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, United Technologies Res Ctr, Xerox, dSpace, Journal Franklin Inst, GE Global Res, Quanser, SIAM, Springer, Taylor & Francis Grp CRC Press, Wiley
ID MOBILE AUTONOMOUS AGENTS; MULTIAGENT SYSTEMS; RANDOM NETWORKS;
AGREEMENT; SEEKING; GRAPHS
AB This paper studies consensus for a team of networked agents with stochastic interactions. Specifically, consensus in the sense of probability is investigated for both fixed and switching interaction graphs that are chosen randomly from some given set. In the static case, a lower bound for the probability of consensus is calculated when each interaction graph is equally likely to be selected among set containing all possible undirected graphs. It is then shown that the (exact) probability of consensus for n agents is strictly increasing with respect to n, whenever n >= 3. For the case of a randomly switching directed interaction graph, the probability of consensus is equal to the probability of an event that is critical for reaching consensus under a deterministic setting. In addition, the equivalence of consensus 1) with probability 1, 2) in probability, and 3) in the r-th mean is demonstrated without requiring an i.i.d. process and linear system dynamics.
C1 [Cao, Yongcan; Casbeer, David W.; Schumacher, Corey] Air Force Res Lab, Control Sci Ctr Excellence, Wright Patterson AFB, OH 45433 USA.
RP Cao, YC (reprint author), Air Force Res Lab, Control Sci Ctr Excellence, Wright Patterson AFB, OH 45433 USA.
OI Cao, Yongcan/0000-0003-3383-0185
NR 17
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0743-1619
BN 978-1-4799-0178-4
J9 P AMER CONTR CONF
PY 2013
BP 5415
EP 5420
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BIB32
UT WOS:000327210205103
ER
PT S
AU Baldwin, M
Kolmanovsky, I
AF Baldwin, Morgan
Kolmanovsky, Ilya
GP IEEE
TI Hypersonic Glider Guidance Using Model Predictive Control
SO 2013 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 17-19, 2013
CL Washington, DC
SP Boeing, Eaton, Halliburton, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, United Technologies Res Ctr, Xerox, dSpace, Journal Franklin Inst, GE Global Res, Quanser, SIAM, Springer, Taylor & Francis Grp CRC Press, Wiley
ID VEHICLE
AB A Model Predictive Control (MPC) approach to hypersonic glider flight management is proposed. Given the capability of MPC to handle constraints, it is promising for application to a hypersonic glider with path constraints. With this approach, the glider navigates through defined way points while avoiding exclusion zones. The minimum-time formulation of MPC is employed. The glider's capability to perform the maneuvers is demonstrated using simulations.
C1 [Baldwin, Morgan] Air Force Res Lab, Space Vehicles Directorate, Albuquerque, NM 87116 USA.
RP Baldwin, M (reprint author), Air Force Res Lab, Space Vehicles Directorate, Albuquerque, NM 87116 USA.
EM afrl.rvsv@kirtland.af.mil; ilya@umich.edu
NR 16
TC 0
Z9 0
U1 1
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0743-1619
BN 978-1-4799-0178-4
J9 P AMER CONTR CONF
PY 2013
BP 5550
EP 5555
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BIB32
UT WOS:000327210205125
ER
PT S
AU Baldwin, M
Kolmanovsky, I
AF Baldwin, Morgan
Kolmanovsky, Ilya
GP IEEE
TI Constrained Inner-Loop Control of a Hypersonic Glider Using Extended
Command Governor
SO 2013 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 17-19, 2013
CL Washington, DC
SP Boeing, Eaton, Halliburton, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, United Technologies Res Ctr, Xerox, dSpace, Journal Franklin Inst, GE Global Res, Quanser, SIAM, Springer, Taylor & Francis Grp CRC Press, Wiley
AB The paper considers inner-loop control of a hypersonic glider. To maintain vehicle flight, pointwise-in-time constraints on vehicle state and control variables need to be enforced. To enforce constraints, an Extended Command Governor (ECG) is augmented to the nominal LQ-PI controller. Simulation results demonstrate the capability of the ECG to enforce the constraints while minimizing the degradation in the vehicle responsiveness.
C1 [Baldwin, Morgan] Air Force Res Lab, Space Vehicles Directorate, Albuquerque, NM 87116 USA.
RP Baldwin, M (reprint author), Air Force Res Lab, Space Vehicles Directorate, Albuquerque, NM 87116 USA.
EM afrl.rvsv@kirtland.af.mil; ilya@umich.edu
NR 19
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0743-1619
BN 978-1-4799-0178-4
J9 P AMER CONTR CONF
PY 2013
BP 5556
EP 5561
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BIB32
UT WOS:000327210205126
ER
PT B
AU Franzi, M
Gilgenbach, R
Hoff, B
Lau, YY
Simon, D
French, D
Jordan, NM
Luginsland, JW
AF Franzi, Matthew
Gilgenbach, Ronald
Hoff, Brad
Lau, Y. Y.
Simon, David
French, David
Jordan, N. M.
Luginsland, John W.
GP IEEE
TI y Microwave Oscillations in the Recirculating Planar Magnetron
SO 2013 IEEE 14TH INTERNATIONAL VACUUM ELECTRONICS CONFERENCE (IVEC)
LA English
DT Proceedings Paper
CT 14th IEEE International Vacuum Electronics Conference (IVEC)
CY MAY 21-23, 2013
CL Paris, FRANCE
SP IEEE, ESA, EDS, THALES, CBL Ceram Ltd, CST
DE High power Microwaves (HPM); magnetron; electron beams; coherent
radiation
AB The Recirculating Planar Magnetron (RPM) is a crossed-field device which presents numerous potential advantages in generating High Power Microwaves (HPM). A 12-cavity, conventional-polarity, 1-GHz RPM model has been experimentally designed and tested at a -300 kV, 0.3-0.5 microsecond pulselengths and a 0.2 T axial magnetic field. The experimental results and future concepts are under investigation.
C1 [Franzi, Matthew; Gilgenbach, Ronald; Lau, Y. Y.; Simon, David; Jordan, N. M.] Univ Michigan, Plasma Pulsed Power & Microwave Lab, Nucl Engn & Radiol Sci Dept, Ann Arbor, MI 48109 USA.
[Hoff, Brad; Simon, David] US Air Force, Res Lab, Kirtland AFB, NM USA.
[Luginsland, John W.] Air Force Off Sci Res, Arlington, VA USA.
RP Franzi, M (reprint author), Univ Michigan, Plasma Pulsed Power & Microwave Lab, Nucl Engn & Radiol Sci Dept, Ann Arbor, MI 48109 USA.
NR 7
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-5977-1; 978-1-4673-5976-4
PY 2013
PG 2
WC Engineering, Electrical & Electronic
SC Engineering
GA BHY61
UT WOS:000327022700224
ER
PT B
AU Baker, NA
Barr, JL
Bonheyo, GT
Joslyn, CA
Krishnaswami, K
Oxley, ME
Quadrel, R
Sego, LH
Tardiff, MF
Wynne, AS
AF Baker, Nathan A.
Barr, Jonathan L.
Bonheyo, George T.
Joslyn, Cliff A.
Krishnaswami, Kannan
Oxley, Mark E.
Quadrel, Rich
Sego, Landon H.
Tardiff, Mark F.
Wynne, Adam S.
BE Glass, K
Colbaugh, R
Sanfillippo, A
Kao, A
Gabbay, M
Corley, C
Li, J
Khan, L
Wynne, A
Coote, L
Mao, W
Zeng, D
Yaghoobi, A
TI Research towards a systematic signature discovery process
SO 2013 IEEE INTERNATIONAL CONFERENCE ON INTELLIGENCE AND SECURITY
INFORMATICS: BIG DATA, EMERGENT THREATS, AND DECISION-MAKING IN SECURITY
INFORMATICS
LA English
DT Proceedings Paper
CT 11th IEEE International Conference on Intelligence and Security
Informatics (IEEE ISI)
CY JUN 04-07, 2013
CL Pacific NW Natl Lab, Seattle, WA
SP IEEE, IEEE Intelligent Transportat Syst Soc, Intelligence Adv Res Projects Act
HO Pacific NW Natl Lab
ID IDEA; PRODUCTIVITY; PERFORMANCE; CREATIVITY; GENERATION; ALIGNMENT;
QUALITY; CANCER
AB In its most general form, a signature is a unique or distinguishing measurement, pattern, or collection of data that identifies a phenomenon (object, action, or behavior) of interest. The discovery of signatures is an important aspect of a wide range of disciplines from basic science to national security for the rapid and efficient detection and/or prediction of phenomena. Current practice in signature discovery is typically accomplished by asking domain experts to characterize and/or model individual phenomena to identify what might compose a useful signature. What is lacking is an approach that can be applied across a broad spectrum of domains and information sources to efficiently and robustly construct candidate signatures, validate their reliability, measure their quality, and overcome the challenge of detection - all in the face of dynamic conditions, measurement obfuscation, and noisy data environments. Our research has focused on the identification of common elements of signature discovery across application domains and the synthesis of those elements into a systematic process for more robust and efficient signature development. In this way, a systematic signature discovery process lays the groundwork for leveraging knowledge obtained from signatures to a particular domain or problem area, and, more generally, to problems outside that domain. This paper presents the initial results of this research by discussing a mathematical framework for representing signatures and placing that framework in the context of a systematic signature discovery process. Additionally, the basic steps of this process are described with details about the methods available to support the different stages of signature discovery, development, and deployment.
C1 [Baker, Nathan A.; Barr, Jonathan L.; Joslyn, Cliff A.; Krishnaswami, Kannan; Quadrel, Rich; Sego, Landon H.; Tardiff, Mark F.; Wynne, Adam S.] Pacific NW Natl Lab, Natl Secur Directorate, Richland, WA 99352 USA.
[Baker, Nathan A.; Barr, Jonathan L.; Joslyn, Cliff A.; Krishnaswami, Kannan; Quadrel, Rich; Tardiff, Mark F.; Wynne, Adam S.] Pacific NW Natl Lab, Natl Secur Directorate, Richland, WA 99352 USA.
[Bonheyo, George T.] Pacific North West Natl Lab, Energy & Enviornm Directorate, Sequim, WA 98382 USA.
[Oxley, Mark E.] Wright Patterson Air Force Base, Dept Math & Stat, Wright Patterson AFB, OH 45433 USA.
RP Baker, NA (reprint author), Pacific NW Natl Lab, Natl Secur Directorate, Richland, WA 99352 USA.
EM nathan.baker@pnnl.gov; jonathan.barr@pnnl.gov; george.bonheyo@pnnl.gov;
cliff.joslyn@pnnl.gov; kannan.krishnaswami@pnnl.gov;
mark.oxley@afit.edu; rich.quadrel@pnnl.gov; landon.sego@pnnl.gov;
mark.tardiff@pnnl.gov; adam.wynne@pnnl.gov
RI Baker, Nathan/A-8605-2010
OI Baker, Nathan/0000-0002-5892-6506
NR 64
TC 2
Z9 2
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-6213-9; 978-1-4673-6214-6
PY 2013
BP 301
EP 308
PG 8
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BHY71
UT WOS:000327025200075
ER
PT S
AU Doyle, DD
Jennings, AL
Black, JT
AF Doyle, Daniel D.
Jennings, Alan L.
Black, Jonathan T.
BE Ferrero, A
TI Optical Flow Background Subtraction for Real-Time PTZ Camera Object
Tracking
SO 2013 IEEE INTERNATIONAL INSTRUMENTATION AND MEASUREMENT TECHNOLOGY
CONFERENCE (I2MTC)
SE IEEE Instrumentation and Measurement Technology Conference
LA English
DT Proceedings Paper
CT IEEE International Instrumentation and Measurement Technology Conference
(I2MTC)
CY MAY 06-09, 2013
CL Minneapolis, MN
SP IEEE, IEEE Instrumentat & Measurement Soc, Boston Sci, Natl Instruments, Medtronic, Natl Appl Res Lab, Instrument Technol Res Ctr
DE PTZ camera; optical flow; background subtraction; object tracking
ID FEATURES
AB The use of pan/tilt/zoom (PTZ) camera systems with Computer Vision (CV) techniques is a burgeoning field. Utility is most commonly seen with security systems, robotics, navigation and for capturing sports events. This paper seeks to expand the use of PTZ's in the area of measurement; specifically, the real-time tracking and measurement of Nano/Micro Unmanned Aircraft Systems (UAS). Empirical methods for developing various Nano/Micro UASs, typically ornithopter-related, show possibilities, but require theoretical development for continued understanding and advancements. The study of Nano/Micro UAS state characteristics would enable empirical development by providing supplementary model information for use in finite element and computational fluid dynamics analyses. One such advancement is to develop a metrology system using CV tracking coupled with videogrammetry techniques. The focus of this work is to provide a unique method for obtaining high-resolution, high frame-rate images of a UAS. A novel approach using a Graphics Processing Unit (GPU)-based pyramidal implementation of the Lucas-Kanade feature tracker (i.e. optical flow) to subtract PTZ movement is used to obtain motion measurements for directing the PTZ cameras.
C1 [Doyle, Daniel D.; Jennings, Alan L.; Black, Jonathan T.] US Air Force, Inst Technol, Dept Aeronaut & Astronaut Engn, Wright Patterson AFB, OH 45433 USA.
RP Doyle, DD (reprint author), US Air Force, Inst Technol, Dept Aeronaut & Astronaut Engn, Wright Patterson AFB, OH 45433 USA.
EM daniel.doyle@afit.edu; alan.jennings@afit.edu; jonathan.black@afit.edu
RI Black, Jonathan/R-4875-2016
OI Black, Jonathan/0000-0001-9315-3994
NR 21
TC 7
Z9 7
U1 0
U2 3
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1091-5281
BN 978-1-4673-4621-4
J9 IEEE IMTC P
PY 2013
BP 866
EP 871
PG 6
WC Instruments & Instrumentation
SC Instruments & Instrumentation
GA BHX22
UT WOS:000326900400162
ER
PT S
AU Kwon, H
Yoder, J
Baek, S
Gruber, S
Pack, D
AF Kwon, Hyukseong
Yoder, Josiah
Baek, Stanley
Gruber, Scott
Pack, Daniel
GP IEEE
TI Maximizing Target Detection under Sunlight Reflection on Water Surfaces
with an Autonomous Unmanned Aerial Vehicle
SO 2013 INTERNATIONAL CONFERENCE ON UNMANNED AIRCRAFT SYSTEMS (ICUAS)
SE International Conference on Unmanned Aircraft Systems
LA English
DT Proceedings Paper
CT International Conference on Unmanned Aircraft Systems (ICUAS)
CY MAY 28-31, 2013
CL Atlanta, GA
SP IEEE, ICUAS Assoc Inc, CSS, Mediterranean Control Assoc, Univ Denver, Springer, KS&P Technologies LLC
AB Reflected sunlight can significantly impact vision-based object detection and tracking algorithms, especially ones based on an aerial platform operating over a marine environment. Unmanned aerial systems above a water surface may be unable to detect objects on the water surface due to sunlight glitter. Although the area affected by sunlight reflection may be limited, rapid course corrections of unmanned aerial vehicles (UAVs) - especially fixed-wing UAVs - is also limited by aerodynamics, making it challenging to determine a reasonable path that avoids sunlight reflection while maximizing chances to capture a target. In this paper, we propose an approach for autonomous UAV path planning that maximizes the accuracy of the estimated target location by minimizing the sunlight reflection influences.
C1 [Kwon, Hyukseong; Yoder, Josiah; Baek, Stanley; Gruber, Scott] US Air Force Acad, Dept Elect & Comp Engn, Acad Ctr UAS Res, Colorado Springs, CO 80840 USA.
RP Kwon, H (reprint author), US Air Force Acad, Dept Elect & Comp Engn, Acad Ctr UAS Res, Colorado Springs, CO 80840 USA.
EM hyukseong.kwon@usafa.edu
NR 15
TC 1
Z9 1
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2373-6720
BN 978-1-4799-0817-2; 978-1-4799-0815-8
J9 INT CONF UNMAN AIRCR
PY 2013
BP 17
EP 24
PG 8
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BHW29
UT WOS:000326842400003
ER
PT J
AU Farjami, E
Rottmayer, MA
Deiner, LJ
AF Farjami, Elaheh
Rottmayer, Michael A.
Deiner, L. Jay
TI Evidence for oxygen reduction reaction activity of a Ni(OH)(2)/graphene
oxide catalyst
SO JOURNAL OF MATERIALS CHEMISTRY A
LA English
DT Article
ID SCANNING ELECTROCHEMICAL MICROSCOPY; REDUCED GRAPHENE OXIDE;
ALPHA-NICKEL HYDROXIDE; ELECTROCATALYTIC ACTIVITY; MANGANESE OXIDE;
GRAPHITE OXIDE; FUEL-CELLS; THERMAL-DECOMPOSITION; ALKALINE-SOLUTION;
HYBRID MATERIALS
AB Oxygen reduction reaction catalysis on a microwave synthesized Ni(OH) 2/graphene oxide material was investigated via cyclic voltammetry, rotating disk electrode measurements, chronoamperometry, and electrochemical impedance spectroscopy. Cyclic voltammetry in an 0.5 M alkaline solution indicated that the Ni(OH)(2)/graphene oxide material possesses significant oxygen reduction reaction activity as evidenced by a peak potential of -310 mV vs. Ag/AgCl. This value was a shift of + 110 mV as compared to the unsupported Ni(OH)(2) nanoparticles and + 90 mV as compared to the graphene oxide support alone. Rotating disk electrode studies show that the limiting current density of the Ni(OH)(2)/GO catalyst is 1.3 mA cm(-2) and the electron transfer number is 3.5. Chronoamperometry demonstrates that the current density attributable to the oxygen reduction reaction on the Ni(OH)(2)/graphene oxide material sustained a steady state value of 60% of its initial value. Electrochemical Impedance spectroscopy showed that the charge transfer resistance of the Ni(OH)(2)/graphene oxide catalyst was significantly lower than either the Ni(OH)(2) nanoparticles or the graphene oxide support. The electrocatalytic properties of the Ni(OH)(2)/graphene oxide material are discussed in the context of specific chemical interaction between the Ni(OH)(2) nanoparticles and the graphene oxide support.
C1 [Farjami, Elaheh; Deiner, L. Jay] CUNY, New York City Coll Technol, Dept Chem, Brooklyn, NY 11210 USA.
[Rottmayer, Michael A.] Air Force Res Lab, Wright Patterson Afb, OH 45433 USA.
RP Farjami, E (reprint author), CUNY, New York City Coll Technol, Dept Chem, 300 Jay St, Brooklyn, NY 11210 USA.
EM efarjami@citytech.cuny.edu
FU Air Force Research Labs [S-953-19-MR001]; state of New York through the
Graduate Research and Teaching Initiative (GRTI) program; Advanced
Imaging Facility of the College of Staten Island (CUNY)
FX The authors gratefully acknowledge financial support of this work by the
Air Force Research Labs under UES subcontract S-953-19-MR001, and
support for equipment purchases from the state of New York through the
Graduate Research and Teaching Initiative (GRTI) program. The authors
thank the Advanced Imaging Facility of the College of Staten Island
(CUNY) for use of the SEM, and Prof. William L'Amoreaux and Dr. Mike
Bucaro for their help with SEM equipment. The authors also thank Dr.
Alexey Bykov and the City College (CUNY) XRD user facility, and Prof.
Ratislov Levicky and Sade Ruffin of the Polytechnic Institute of New
York University.
NR 65
TC 17
Z9 17
U1 7
U2 69
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 2050-7488
EI 2050-7496
J9 J MATER CHEM A
JI J. Mater. Chem. A
PY 2013
VL 1
IS 48
BP 15501
EP 15508
DI 10.1039/c3ta13351f
PG 8
WC Chemistry, Physical; Energy & Fuels; Materials Science,
Multidisciplinary
SC Chemistry; Energy & Fuels; Materials Science
GA 258GI
UT WOS:000327446900043
ER
PT J
AU Roy, JN
Garcia, KE
Luckarift, HR
Falase, A
Cornejo, J
Babanova, S
Schuler, AJ
Johnson, GR
Atanassov, PB
AF Roy, Jared N.
Garcia, Kristen E.
Luckarift, Heather R.
Falase, Akinbayowa
Cornejo, Jose
Babanova, Sofia
Schuler, Andrew J.
Johnson, Glenn R.
Atanassov, Plamen B.
TI Applied Electrode Potential Leads to Shewanella oneidensis MR-1 Biofilms
Engaged in Direct Electron Transfer
SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY
LA English
DT Article
ID MICROBIAL FUEL-CELLS; OUTER-MEMBRANE CYTOCHROMES;
GEOBACTER-SULFURREDUCENS; BACTERIAL NANOWIRES; SIGNAL TRANSDUCER;
ESCHERICHIA-COLI; SHUTTLES; DETACHMENT; AEROTAXIS; TRANSPORT
AB Energy harvesting by microorganisms is typically associated with the formation of biofilms, but the precise physiological conditions for these processes is not fully elucidated, particularly for the facultative anaerobe Shewanella oneidensis MR-1 when cultured under anaerobic conditions. In this study, electrodes were incubated with anaerobic cultures of S. oneidensis MR-1 while being exposed to applied potential. Cell-to-cell signaling may be utilized by Shewanella to form biofilms, triggered by the release of specific metabolites, such as riboflavin, under changes in environmental conditions. Riboflavin may be retained at the electrode surface and thereby create aredox gradients that directs cell attachment to insoluble electron acceptors. A prolific biofilm developed on the electrode when it was a subjected to an applied potential of -0.3 V vs Ag/AgCl; corresponding to the redox potential for surface-bound oxidized riboflavin. These biofilms display a non-reversible oxidation at 0.2 V determined to be the terminal heme-protein complex in the Mtr pathway by using a double deletion mutant, Delta MtrC/OmcA, (C) 2013 The Electrochemical Society. All rights reserved.
C1 [Roy, Jared N.; Garcia, Kristen E.; Falase, Akinbayowa; Cornejo, Jose; Babanova, Sofia; Atanassov, Plamen B.] Univ New Mexico, Dept Chem & Nucl Engn, Ctr Emerging Energy Technol, Albuquerque, NM 87131 USA.
[Luckarift, Heather R.] Universal Technol Corp, Dayton, OH 45432 USA.
[Luckarift, Heather R.; Johnson, Glenn R.] Air Force Res Lab, Airbase Sci Branch, Tyndall AFB, FL 32403 USA.
[Schuler, Andrew J.] Univ New Mexico, Dept Civil Engn, Albuquerque, NM 87131 USA.
RP Roy, JN (reprint author), Univ New Mexico, Dept Chem & Nucl Engn, Ctr Emerging Energy Technol, Albuquerque, NM 87131 USA.
EM plamen@unm.edu
FU US Air Force Office of Scientific Research MURI: Fundamentals and
Bioengineering of Enzymatic Fuel Cells [FA9550-06-01-0264]; Oak Ridge
Associated Universities
FX This work was supported by a US Air Force Office of Scientific Research
MURI: Fundamentals and Bioengineering of Enzymatic Fuel Cells (contract
FA9550-06-01-0264 to the University of New Mexico) Jared Roy was
supported by a pre-doctoral fellowship provided by Oak Ridge Associated
Universities.
NR 34
TC 5
Z9 5
U1 1
U2 30
PU ELECTROCHEMICAL SOC INC
PI PENNINGTON
PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA
SN 0013-4651
EI 1945-7111
J9 J ELECTROCHEM SOC
JI J. Electrochem. Soc.
PY 2013
VL 160
IS 11
BP H866
EP H871
DI 10.1149/2.001401jes
PG 6
WC Electrochemistry; Materials Science, Coatings & Films
SC Electrochemistry; Materials Science
GA 251CI
UT WOS:000326905000110
ER
PT J
AU Bennett, W
Schreiber, B
Portrey, AM
Bell, HH
AF Bennett, Winston, Jr.
Schreiber, Brian
Portrey, Antoinette M.
Bell, Herbert H.
TI Challenges in Transforming Military Training: Research and Application
of Advanced Simulation and Training Technologies and Methods
SO MILITARY PSYCHOLOGY
LA English
DT Editorial Material
C1 [Bennett, Winston, Jr.; Schreiber, Brian; Portrey, Antoinette M.; Bell, Herbert H.] Air Force Res Lab, Human Effectiveness Directorate, Warfighter Readiness Res Div, Wright Patterson AFB, OH USA.
RP Bennett, W (reprint author), 711 HPW RHAS,2620 Q St,Bldg 20852, Wright Patterson AFB, OH 45433 USA.
EM winston.bennett@wpafb.af.mil
NR 0
TC 1
Z9 1
U1 2
U2 5
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0899-5605
EI 1532-7876
J9 MIL PSYCHOL
JI Milit. Psychol.
PY 2013
VL 25
IS 3
SI SI
BP 173
EP 176
DI 10.1037/mil0000002
PG 4
WC Psychology, Multidisciplinary
SC Psychology
GA 253BY
UT WOS:000327058000001
ER
PT J
AU Alliger, GM
Beard, R
Bennett, W
Symons, S
Colegrove, C
AF Alliger, George M.
Beard, Rebecca
Bennett, Winston, Jr.
Symons, Steven
Colegrove, Charles
TI A Psychometric Examination of Mission Essential Competency (MEC)
Measures Used in Air Force Distributed Mission Operations Training Needs
Analysis
SO MILITARY PSYCHOLOGY
LA English
DT Article
DE competency-based assessment; competency-based training;
proficiency-based training; mission essential competencies; competency
assessment
AB The Mission Essential Competency (MEC) approach to work and training needs analysis has been the focus of a multiyear research project of the United States Air Force. This article was written with the specific goal of reviewing the psychometric characteristics of the various measures that are used in this process. Using extensive survey data from different target populations, we show that the MEC measures are reliable and perform in a way that valid measures would be expected to perform, such as demonstrating appropriate expert/novice differences, expected relationships between general competencies and MECs, and reasonable relationships between job tenure and knowledge/skill.
C1 [Alliger, George M.; Beard, Rebecca] Grp Org Effectiveness Inc, Albany, NY 12203 USA.
[Bennett, Winston, Jr.; Symons, Steven] US Air Force Res Lab, Human Effectiveness Directorate, Warfighter Readiness Res Div, Dayton, OH USA.
[Colegrove, Charles] Air Combat Command, Flight Operat & Training Branch, Langley Afb, VA USA.
RP Alliger, GM (reprint author), Grp Org Effectiveness Inc, 727 Waldens Pond Rd, Albany, NY 12203 USA.
EM george.alliger@groupoe.com
NR 17
TC 3
Z9 3
U1 2
U2 4
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0899-5605
EI 1532-7876
J9 MIL PSYCHOL
JI Milit. Psychol.
PY 2013
VL 25
IS 3
SI SI
BP 218
EP 233
DI 10.1037/h0094964
PG 16
WC Psychology, Multidisciplinary
SC Psychology
GA 253BY
UT WOS:000327058000005
ER
PT J
AU MacMillan, J
Entin, EB
Morley, R
Bennett, W
AF MacMillan, Jean
Entin, Eileen B.
Morley, Rebecca
Bennett, Winston, Jr.
TI Measuring Team Performance in Complex and Dynamic Military Environments:
The SPOTLITE Method
SO MILITARY PSYCHOLOGY
LA English
DT Article
DE performance measurement; performance assessment; simulation-based
training; team training; training feedback
AB The Scenario-based Performance Observation Tool for Learning In Team Environments (SPOTLITE) provides a systematic method for developing team performance measurement instruments comprised of behaviorally anchored rating scales that are tied to observable behaviors that tap critical knowledge and skills and can be assessed at specific intervals during a training scenario. We developed a measurement instrument for four-person teams of F-16 pilots training for air-to-air combat in a high-fidelity simulation environment and implemented it in a handheld computer to support fast and accurate data entry as a team executes a scenario. An experiment demonstrated the sensitivity, reliability, and validity of the instrument.
C1 [MacMillan, Jean; Entin, Eileen B.; Morley, Rebecca] Aptima Inc, Woburn, MA 01801 USA.
[Bennett, Winston, Jr.] US Air Force Res Lab, Human Effectiveness Directorate, Warfighter Readiness Res Div, Dayton, OH USA.
RP MacMillan, J (reprint author), Aptima Inc, 12 Gill St,Suite 1400, Woburn, MA 01801 USA.
EM macmillj@aptima.com
NR 16
TC 2
Z9 3
U1 2
U2 9
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0899-5605
EI 1532-7876
J9 MIL PSYCHOL
JI Milit. Psychol.
PY 2013
VL 25
IS 3
SI SI
BP 266
EP 279
DI 10.1037/h0094968
PG 14
WC Psychology, Multidisciplinary
SC Psychology
GA 253BY
UT WOS:000327058000009
ER
PT J
AU Marietta, DA
Fisher, KA
Taylor, CN
AF Marietta, Daniel A.
Fisher, Kenneth A.
Taylor, Clark N.
GP ION
TI Monte Carlo Error Characterization of EKF-Based Image Aided Navigation
SO PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE
OF NAVIGATION
LA English
DT Proceedings Paper
CT International Technical Meeting of the Institute-of-Navigation
CY JAN 27-29, 2013
CL San Diego, CA
SP Inst Nav
AB Image Aided Navigation (IAN) is a self-contained navigation scheme that utilizes information contained in images taken of the scene surrounding the navigation vehicle to provide measurements that complement inertial data, reducing navigation errors. This paper presents the results of an effort to characterize the errors committed by a specific IAN algorithm. Such a characterization supports the further development of the algorithm by providing a baseline measure of expected filter performance against which future versions may be compared. To accomplish this task, a 100 run collection of inertial and imaging data was performed using a ground vehicle navigating a rectangular indoor path within a controlled environment. This data was processed offline through the prototype IAN algorithm proposed in [14], and a Monte Carlo error analysis performed of the position errors committed by the filter. Such an analysis of an IAN filter based upon areal world data collection of this size does not yet exist in the literature. Examples of filter divergence were seen within the analysis results, and these divergent runs were then examined separately, with an exploration of possible divergence indicators (filter computed covariance and measurement residuals) and suspected causes of the divergent behavior. The results of this work provide a full characterization of the filter committed errors.
C1 [Marietta, Daniel A.; Fisher, Kenneth A.] Air Force Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Taylor, Clark N.] Air Force Res Lab, Elect Engn, Wright Patterson AFB, OH USA.
RP Marietta, DA (reprint author), Air Force Inst Technol, Wright Patterson AFB, OH 45433 USA.
NR 14
TC 0
Z9 0
U1 0
U2 0
PU INST NAVIGATION
PI WASHINGTON
PA 815 15TH ST NW, STE 832, WASHINGTON, DC 20005 USA
PY 2013
BP 675
EP 686
PG 12
WC Remote Sensing
SC Remote Sensing
GA BHZ13
UT WOS:000327063800066
ER
PT J
AU Zhu, Z
Boroson, E
Berardi, S
Park, H
Venable, D
AF Zhu, Zhen
Boroson, Elizabeth
Berardi, Steve
Park, Han
Venable, Don
GP ION
TI Architecture for Asymmetric Collaborative Navigation - Considerations
for Real Time Implementation of the Collaborative Robust Integrated
Sensor Positioning (CRISP) System
SO PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE
OF NAVIGATION
LA English
DT Proceedings Paper
CT International Technical Meeting of the Institute-of-Navigation
CY JAN 27-29, 2013
CL San Diego, CA
SP Inst Nav
DE layered sensing; vision-aided; real time; collaborative navigation
ID FEATURES
AB Under the Air Force Research Laboratory (AFRL) Collaborative Robust Integrated Sensor Positioning (CRISP) program, Northrop Grumman Corporation (NGC) is designing and building a collaborative navigation solution between multiple airborne platforms. The CRISP architecture takes advantage of AFRL's Layered Sensing construct, which enables platforms to share navigation information, including geo-registered imagery. The system makes use of the higher performing sensors on the high-flyer (HF) platform, which are less susceptible to jamming, and cameras that generate larger sensor footprint and higher resolution images of the terrain. The low-flyers (LFs) have lower-quality navigation sensors, are more likely to be jammed, and have a more limited view of the terrain. Under this scenario, the HF may assist one or more LFs such that they, too, can have similar accuracy as the HF in a GPS-denied environment. This paper presents the progress on the development of the CRISP system, based on the algorithms that have been verified using Government Furnished datasets. Some of the considerations included in the design process of the real time system are also discussed.
C1 [Zhu, Zhen; Boroson, Elizabeth; Berardi, Steve; Park, Han] Northrop Grumman Corp, Woodland Hills, CA 91367 USA.
[Venable, Don] WPAFB, AF Res Lab, Wright Patterson AFB, OH USA.
RP Zhu, Z (reprint author), Northrop Grumman Corp, Woodland Hills, CA 91367 USA.
FU PA [RY-13-0050]
FX This document is approved for public release; distribution is unlimited,
PA Case # RY-13-0050
NR 15
TC 0
Z9 0
U1 0
U2 5
PU INST NAVIGATION
PI WASHINGTON
PA 815 15TH ST NW, STE 832, WASHINGTON, DC 20005 USA
PY 2013
BP 709
EP 716
PG 8
WC Remote Sensing
SC Remote Sensing
GA BHZ13
UT WOS:000327063800069
ER
PT J
AU Guan, K
Peterson, GL
Kresge, JT
Campbell, JL
AF Guan, Kwee
Peterson, Gilbert L.
Kresge, Jared T.
Campbell, Jacob L.
GP ION
TI Intelligent Behavioral Action Aiding For Improved Image Navigation
SO PROCEEDINGS OF THE 2013 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE
OF NAVIGATION
LA English
DT Proceedings Paper
CT International Technical Meeting of the Institute-of-Navigation
CY JAN 27-29, 2013
CL San Diego, CA
SP Inst Nav
AB In egomotion image navigation, errors are common especially when traversing areas with few landmarks. Since image navigation is often used as a passive navigation technique in GNSS (Global Navigation Satellite Systems) denied environments, egomotion accuracy is important for precise navigation in these challenging environments. One of the causes of egomotion errors is inaccurate landmark distance measurement (e. g. sensor noise). This research develops a landmark location egomotion error model that quantifies the effects of landmark locations on egomotion value uncertainty and errors. The error model accounts for increases in landmark uncertainty due to landmark distance and image centrality. A robot then uses the error model to execute actions that position landmarks in image positions that give the least egomotion calculation uncertainty. Three action-aiding solutions are proposed: (1) qualitative non-evaluative aiding action, (2) quantitative evaluative aiding action with physical scans, and (3) quantitative evaluative aiding action with landmark tracking. Simulation results show that both action-aiding techniques reduce the position uncertainty compared to no action aiding. Physical testing results substantiate simulation results. Compared to no action aiding, non-evaluative action aiding reduced egomotion position errors by an average 31.5%, while evaluative action aiding reduced egomotion position errors by an average 72.5%. Physical testing also showed that evaluative action aiding enables egomotion to work reliably in areas with few features, achieving 76% error reduction in egomotion position compared to no aiding.
C1 [Guan, Kwee; Peterson, Gilbert L.; Kresge, Jared T.] AFIT, Wright Patterson AFB, OH 45433 USA.
[Campbell, Jacob L.] AFRL, Wright Patterson AFB, OH 45433 USA.
RP Guan, K (reprint author), AFIT, Wright Patterson AFB, OH 45433 USA.
NR 16
TC 0
Z9 0
U1 0
U2 0
PU INST NAVIGATION
PI WASHINGTON
PA 815 15TH ST NW, STE 832, WASHINGTON, DC 20005 USA
PY 2013
BP 771
EP 779
PG 9
WC Remote Sensing
SC Remote Sensing
GA BHZ13
UT WOS:000327063800076
ER
PT S
AU Zhdanov, BV
Knize, RJ
AF Zhdanov, B. V.
Knize, R. J.
BE Titterton, DH
Richardson, MA
Grasso, RJ
Ackermann, H
Bohn, WL
TI DPAL: historical perspective and summary of achievements
SO TECHNOLOGIES FOR OPTICAL COUNTERMEASURES X; AND HIGH-POWER LASERS 2013:
TECHNOLOGY AND SYSTEMS
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Technologies for Optical Countermeasures X; and High-Power
Lasers - Technology and Systems
CY SEP 23-26, 2013
CL Dresden, GERMANY
SP SPIE
DE DPAL; alkali lasers; high power gas lasers
ID CESIUM-VAPOR LASER; PUMPED ALKALI LASERS; COLLISION-INDUCED PROCESSES;
INDUCED AMPLIFIED EMISSION; SODIUM VAPOR; POTASSIUM LASER; DIODE ARRAY;
CS LASER; INELASTIC-COLLISIONS; BUFFER GAS
AB Alkali vapor lasers are under extensive research and development during the past decade because of their potential for scaling to high powers while maintaining a good beam quality. Also, a possibility of using efficient diode lasers for pumping alkali vapor promises high total wall plug efficiency for a Diode Pumped Alkali Laser (DPAL). Since the first DPAL demonstration with output power of 130 mW in 2005(1), a significant progress in this field was achieved. The output power of about 1 kW in continuous wave (CW) operation with optical efficiency close to 50% was recently demonstrated for a Cs DPAL(2). Also, the DPALs based on other alkali metals (Rubidium and Potassium) were demonstrated(3,4). In spite of these significant achievements, there are still several problems in DPAL power scaling exist that must be addressed. Among them are the thermal(5) and photoionization(6) issues that become important even at power level about several tens of watts. In this paper we present a historical review of the alkali laser research and development, discuss the most important achievements and future perspectives in this field of research.
C1 [Zhdanov, B. V.; Knize, R. J.] US Air Force Acad, Laser & Opt Res Ctr, Colorado Springs, CO 80840 USA.
RP Zhdanov, BV (reprint author), US Air Force Acad, Laser & Opt Res Ctr, 2354 Fairchild Dr,Ste 2A31, Colorado Springs, CO 80840 USA.
EM boris.zhdanov.ctr@usafa.edu
NR 96
TC 2
Z9 2
U1 1
U2 8
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9767-3
J9 PROC SPIE
PY 2013
VL 8898
AR 88980V
DI 10.1117/12.2033923
PG 17
WC Optics; Physics, Applied
SC Optics; Physics
GA BIA30
UT WOS:000327137200024
ER
PT S
AU Braydich-Stolle, LK
Schaeublin, NM
Hussain, SM
AF Braydich-Stolle, Laura K.
Schaeublin, Nicole M.
Hussain, Saber M.
BE Leszczynski, J
Puzyn, T
TI In Vitro Toxicity Assessment of Metallic Nanomaterials
SO TOWARDS EFFICIENT DESIGNING OF SAFE NANOMATERIALS: INNOVATIVE MERGE OF
COMPUTATIONAL APPROACHES AND EXPERIMENTAL TECHNIQUES
SE RSC Nanoscience and Nanotechnology
LA English
DT Article; Book Chapter
ID IRON-OXIDE NANOPARTICLES; INDUCE OXIDATIVE DAMAGE; GOLD NANOPARTICLES;
TITANIUM-DIOXIDE; SILVER NANOPARTICLES; EPITHELIAL-CELLS; CELLULAR
UPTAKE; SUPERPARAMAGNETIC NANOPARTICLES; BIOMEDICAL APPLICATIONS;
INTRACELLULAR UPTAKE
C1 [Braydich-Stolle, Laura K.; Schaeublin, Nicole M.; Hussain, Saber M.] Air Force Res Lab, Appl Biotechnol Branch, Human Effectiveness Directorate, Wright Patterson AFB, OH 45433 USA.
RP Braydich-Stolle, LK (reprint author), Air Force Res Lab, Appl Biotechnol Branch, Human Effectiveness Directorate, Wright Patterson AFB, OH 45433 USA.
EM saber.hussain@wpafb.af.mil
NR 78
TC 0
Z9 0
U1 0
U2 0
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, CAMBRIDGE CB4 4WF, CAMBS, ENGLAND
SN 1757-7136
BN 978-1-84973-547-6; 978-1-84973-453-0
J9 RSC NANOSCI NANOTECH
PY 2013
VL 25
BP 27
EP 42
DI 10.1039/9781849735476-00027
D2 10.1039/9781849735476
PG 16
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA BHW55
UT WOS:000326863100003
ER
PT J
AU Do, JJ
Samuels, SM
Adkins, DJ
Clinard, ME
Koveleskie, AJ
AF Do, James J.
Samuels, Steven M.
Adkins, Donald J.
Clinard, Matthew E.
Koveleskie, Aaron J.
TI Gender Bias and Pluralistic Ignorance in Perceptions of Fitness
Assessments
SO MILITARY PSYCHOLOGY
LA English
DT Article
DE gender bias; pluralistic ignorance; USAFA; sexism; fitness test
ID MILITARY ACADEMIES; WOMEN; ATTITUDES; SEXISM; FAIRNESS
AB Two studies examined the relationship between cadets' views toward women, specifically, attitudes about fitness testing at the United States Air Force Academy (USAFA). Cadets completed measures of views toward women in society, in the military, at USAFA, and fitness testing. Results revealed that many male cadets held sexist attitudes of women in all categories. Cadets who held egalitarian views of women in society and in the military were more likely to support equitable fitness standards. Furthermore, cadets' personal viewpoints differed from their perception of the entire cadet population viewpoint, creating an environment of pluralistic ignorance. That is, cadets believed the collective was more sexist than themselves, suggesting that a vocal minority who perpetuate sexist attitudes may hinder changes in culture.
C1 [Do, James J.; Samuels, Steven M.; Adkins, Donald J.; Clinard, Matthew E.; Koveleskie, Aaron J.] US Air Force Acad, Dept Behav Sci & Leadership, Colorado Springs, CO 80840 USA.
RP Samuels, SM (reprint author), USAF Acad, HQ USAFA DFBL, 2354 Fairchild Dr,Suite 6L-101B, Colorado Springs, CO 80840 USA.
EM steven.samuels@usafa.edu
NR 43
TC 1
Z9 1
U1 2
U2 9
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0899-5605
EI 1532-7876
J9 MIL PSYCHOL
JI Milit. Psychol.
PY 2013
VL 25
IS 1
BP 23
EP 35
DI 10.1037/h0094754
PG 13
WC Psychology, Multidisciplinary
SC Psychology
GA 252RK
UT WOS:000327027000004
ER
PT J
AU Staal, MA
Stephenson, JA
AF Staal, Mark A.
Stephenson, James A.
TI Operational Psychology Post-9/11: A Decade of Evolution
SO MILITARY PSYCHOLOGY
LA English
DT Article
DE operational; national security; military; 9/11; national defense
ID MILITARY PSYCHOLOGY; DEFENSE; DOCTORS; MODEL; WAR
AB decade, it has emerged from relative obscurity and developed into an exciting, and somewhat controversial, professional subdiscipline within psychology. As the community of operational psychologists has increased and matured, it has reached a tipping point, creating the need for practice guidelines, training programs, and a greater emphasis on operationally relevant empirical research. The starting point for these developments is an integrative definition of operational psychology. In this article, we revisit previous definitions, relevant research literature, and recent developments in this specialty. We propose a definition that emphasizes consultation to an operational decision maker concerning issues of national security and defense.
C1 [Staal, Mark A.] US Special Operat Command, USAF, Pope Aaf, NC USA.
[Stephenson, James A.] Univ Air, Spaatz Ctr, USAF, Montgomery, AL USA.
RP Staal, MA (reprint author), Bldg 1947,Malvesti Rd, Pope Aaf, NC 28307 USA.
EM staalm@jdi.socom.mil
NR 49
TC 0
Z9 0
U1 3
U2 3
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0899-5605
EI 1532-7876
J9 MIL PSYCHOL
JI Milit. Psychol.
PY 2013
VL 25
IS 2
BP 93
EP 104
DI 10.1037/h0094951
PG 12
WC Psychology, Multidisciplinary
SC Psychology
GA 253BT
UT WOS:000327057500001
ER
PT J
AU Rose, MR
Arnold, RD
Howse, WR
AF Rose, Mark R.
Arnold, Richard D.
Howse, William R.
TI Unmanned Aircraft Systems Selection Practices: Current Research and
Future Directions
SO MILITARY PSYCHOLOGY
LA English
DT Article
DE unmanned aircraft system; remotely piloted aircraft; unmanned aerial
system; unmanned aerial vehicle; pilot selection
AB This review examines evolving personnel selection practices for unmanned aircraft systems/remotely piloted aircraft (UAS/RPA) across the U.S. Air Force, U.S. Naval Services, and U.S. Army. Findings across services revealed several themes, including strengths (e.g., strong predictive validities, consistency in operator profiles), weaknesses (e.g., small number of predictive validation studies, small sample sizes), and gaps (e.g., need for further investigation of noncognitive predictors). Ongoing and proposed research, including development and implementation of new instruments and methodologies, are discussed, followed by suggestions to facilitate enhanced UAS/RPA selection practices across the services.
C1 [Rose, Mark R.] AF Personnel Ctr AFPC DSYX, Randolph AFB, TX 78150 USA.
[Arnold, Richard D.] Naval Med Res Unit Dayton, Wright Patterson AFB, OH USA.
[Howse, William R.] Damos Aviat Serv, Gurnee, IL USA.
RP Rose, MR (reprint author), HQ AF Personnel Ctr AFPC DSYX, 550 C St W,Ste 45, Randolph AFB, TX 78150 USA.
EM mark.rose.7@us.af.mil
NR 49
TC 1
Z9 1
U1 1
U2 4
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0899-5605
EI 1532-7876
J9 MIL PSYCHOL
JI Milit. Psychol.
PY 2013
VL 25
IS 5
BP 413
EP 427
DI 10.1037/mil0000008
PG 15
WC Psychology, Multidisciplinary
SC Psychology
GA 253CJ
UT WOS:000327059100001
ER
PT J
AU Wolfe, AL
Arrow, H
AF Wolfe, Andrea L.
Arrow, Holly
TI Military Influence Tactics: Lessons Learned in Iraq and Afghanistan
SO MILITARY PSYCHOLOGY
LA English
DT Article
DE cross-cultural influence; Military Information Support Operations
(MISO); influence techniques
ID PLANNED BEHAVIOR
AB When deployed U. S. soldiers attempt to influence the attitudes, beliefs, or behaviors of civilians, success can save lives and failure can be deadly. Survey data from 228 military personnel with deployment experience to Iraq and Afghanistan revealed that in a challenging wartime environment, empathy, respect, prior relationships, and familiarity with influence targets predicted success in cross-cultural influence attempts. Influence techniques involving resources and positive feelings were used more commonly in relatively successful influence attempts; negative tactics were used more commonly in unsuccessful attempts.
C1 [Wolfe, Andrea L.; Arrow, Holly] Univ Oregon, Dept Psychol, Eugene, OR 97403 USA.
RP Wolfe, AL (reprint author), USAF Acad, US Air Force Acad, Dept Behav Sci & Leadership, Colorado Springs, CO 80840 USA.
EM andrea.wolfe@usafa.edu
NR 21
TC 0
Z9 0
U1 2
U2 4
PU AMER PSYCHOLOGICAL ASSOC
PI WASHINGTON
PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 USA
SN 0899-5605
EI 1532-7876
J9 MIL PSYCHOL
JI Milit. Psychol.
PY 2013
VL 25
IS 5
BP 428
EP 437
DI 10.1037/mil0000009
PG 10
WC Psychology, Multidisciplinary
SC Psychology
GA 253CJ
UT WOS:000327059100002
ER
PT S
AU Mukhopadhyay, S
AF Mukhopadhyay, Sanjoy
BE Fiederle, M
Burger, A
Franks, L
James, RB
TI Direction-Sensitive Hand-Held Gamma-Ray Spectrometer
SO HARD X-RAY, GAMMA-RAY, AND NEUTRON DETECTOR PHYSICS XV
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT SPIE Conference on Hard X-Ray, Gamma-Ray, and Neutron Detector Physics
XV
CY AUG 26-28, 2013
CL San Diego, CA
SP SPIE
AB A novel, light-weight, hand-held gamma-ray detector with directional sensitivity is being designed. The detector uses a set of multiple rings around two cylindrical surfaces, which provides precise location of two interaction points on two concentric cylindrical planes, wherefrom the source location can be traced back by back projection and/or Compton imaging technique. The detectors are 2.0 x 2.0 mm europium-doped strontium iodide (SrI2:Eu2+) crystals, whose light output has been measured to exceed 120,000 photons/MeV, making it one of the brightest scintillators in existence. The crystal's energy resolution, less than 3% at 662 keV, is also excellent, and the response is highly linear over a wide range of gamma-ray energies.
The emission of SrI2:Eu2+ is well matched to both photo-multiplier tubes and blue-enhanced silicon photodiodes. The solid-state photomultipliers used in this design (each 2.0 x 2.0 mm) are arrays of active pixel sensors (avalanche photodiodes driven beyond their breakdown voltage in reverse bias); each pixel acts as a binary photon detector, and their summed output is an analog representation of the total photon energy, while the individual pixel accurately defines the point of interaction.
A simple back-projection algorithm involving cone-surface mapping is being modeled. The back projection for an event cone is a conical surface defining the possible location of the source. The cone axis is the straight line passing through the first and second interaction points.
C1 Natl Secur Technol LLC, Remote Sensing Lab, Andrews AFB, MD USA.
RP Mukhopadhyay, S (reprint author), Natl Secur Technol LLC, Remote Sensing Lab, Andrews AFB, MD USA.
NR 4
TC 0
Z9 0
U1 1
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9702-4
J9 PROC SPIE
PY 2013
VL 8852
AR 885218
DI 10.1117/12.2018350
PG 7
WC Optics; Physics, Applied; Physics, Particles & Fields
SC Optics; Physics
GA BHT73
UT WOS:000326643800020
ER
PT S
AU Mukhopadhyay, S
Maurer, R
Wolff, R
Mitchell, S
Guss, P
Trainham, C
AF Mukhopadhyay, Sanjoy
Maurer, Richard
Wolff, Ronald
Mitchell, Stephen
Guss, Paul
Trainham, Clifford
BE Fiederle, M
Burger, A
Franks, L
James, RB
TI Exploitation of geometric occlusion and covariance spectroscopy in a
gamma sensor array
SO HARD X-RAY, GAMMA-RAY, AND NEUTRON DETECTOR PHYSICS XV
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT SPIE Conference on Hard X-Ray, Gamma-Ray, and Neutron Detector Physics
XV
CY AUG 26-28, 2013
CL San Diego, CA
SP SPIE
DE occlusion; covariance spectroscopy; correlations; fluctuations; Compton
scattering
AB The National Security Technologies, LLC, Remote Sensing Laboratory has recently used an array of six small-footprint (1-inch diameter by 3-inch long) cylindrical crystals of thallium-doped sodium iodide scintillators to obtain angular information from discrete gamma ray-emitting point sources. Obtaining angular information in a near-field measurement for a field-deployed gamma sensor is a requirement for radiological emergency work. Three of the sensors sit at the vertices of a 2-inch isosceles triangle, while the other three sit on the circumference of a 3-inch-radius circle centered in this triangle. This configuration exploits occlusion of sensors, correlation from Compton scattering within a detector array, and covariance spectroscopy, a spectral coincidence technique.
Careful placement and orientation of individual detectors with reference to other detectors in an array can provide improved angular resolution for determining the source position by occlusion mechanism. By evaluating the values of, and the uncertainties in, the photopeak areas, efficiencies, branching ratio, peak area correction factors, and the correlations between these quantities, one can determine the precise activity of a particular radioisotope from a mixture of radioisotopes that have overlapping photopeaks that are ordinarily hard to deconvolve. The spectral coincidence technique, often known as covariance spectroscopy, examines the correlations and fluctuations in data that contain valuable information about radiation sources, transport media, and detection systems. Covariance spectroscopy enhances radionuclide identification techniques, provides directional information, and makes weaker gamma-ray emission-normally undetectable by common spectroscopic analysis-detectable. A series of experimental results using the concept of covariance spectroscopy are presented.
C1 [Mukhopadhyay, Sanjoy; Maurer, Richard; Wolff, Ronald] Remote Sensing Lab Andrews Operat, Andrews AFB, MD 20762 USA.
RP Mukhopadhyay, S (reprint author), Remote Sensing Lab Andrews Operat, 1783 Arnold Ave, Andrews AFB, MD 20762 USA.
EM mukhops@nv.doe.gov
NR 3
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9702-4
J9 PROC SPIE
PY 2013
VL 8852
AR 88520H
DI 10.1117/12.2019482
PG 10
WC Optics; Physics, Applied; Physics, Particles & Fields
SC Optics; Physics
GA BHT73
UT WOS:000326643800009
ER
PT J
AU Hehlen, MP
Sheik-Bahae, M
Epstein, RI
Melgaard, SD
Seletskiy, DV
AF Hehlen, Markus P.
Sheik-Bahae, Mansoor
Epstein, Richard I.
Melgaard, Seth D.
Seletskiy, Denis V.
TI Materials for Optical Cryocoolers
SO JOURNAL OF MATERIALS CHEMISTRY C
LA English
DT Article
ID BAY2F8 SINGLE-CRYSTAL; THULIUM-DOPED GLASS; ROOM-TEMPERATURE; LASER;
REFRIGERATION; LUMINESCENCE; SEMICONDUCTOR; MICROPHONICS; SOLIDS; ORIGIN
AB Vibration-free cooling of detectors to cryogenic temperatures is critical for many terrestrial, airborne, and space-based instruments. Cooling of solids by anti-Stokes fluorescence is an emerging refrigeration technology that is inherently vibration-free and compact, and enables cooling of small loads to cryogenic temperatures. In this Highlight, advances in laser-cooling of solids are discussed with a particular focus on the recent breakthrough laser cooling of Yb3+-doped YLiF4 crystals to 114 K. The importance of the material structure, composition, and purity of laser-cooling materials and their influence on the optical refrigerator device performance is emphasized.
C1 [Hehlen, Markus P.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
[Sheik-Bahae, Mansoor; Epstein, Richard I.; Melgaard, Seth D.] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA.
[Melgaard, Seth D.] Air Force Res Lab, Kirtland AFB, NM 87117 USA.
[Seletskiy, Denis V.] Univ Konstanz, Dept Phys, D-78457 Constance, Germany.
[Seletskiy, Denis V.] Univ Konstanz, Ctr Appl Photon, D-78457 Constance, Germany.
[Epstein, Richard I.] ThermoDynam Films LLC, Santa Fe, NM 87505 USA.
RP Hehlen, MP (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, Mailstop E549, Los Alamos, NM 87545 USA.
EM hehlen@lanl.gov
RI Seletskiy, Denis/C-1372-2011
OI Seletskiy, Denis/0000-0003-3480-4595
NR 61
TC 12
Z9 12
U1 0
U2 22
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 2050-7526
EI 2050-7534
J9 J MATER CHEM C
JI J. Mater. Chem. C
PY 2013
VL 1
IS 45
BP 7471
EP 7478
DI 10.1039/c3tc31681e
PG 8
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 247UP
UT WOS:000326648100001
ER
PT J
AU De Sio, L
Klein, G
Serak, S
Tabiryan, N
Cunningham, A
Tone, CM
Ciuchi, F
Burgi, T
Umeton, C
Bunning, T
AF De Sio, Luciano
Klein, Gerard
Serak, Svetlana
Tabiryan, Nelson
Cunningham, Alastair
Tone, Caterina Maria
Ciuchi, Federica
Buergi, Thomas
Umeton, Cesare
Bunning, Timothy
TI All-optical control of localized plasmonic resonance realized by
photoalignment of liquid crystals
SO JOURNAL OF MATERIALS CHEMISTRY C
LA English
DT Article
ID GOLD NANORODS; NANOPARTICLES; PARTICLES; ARRAY; SHAPE
AB Large shifts in the plasmonic resonances of a thin film of gold nanorods (GNRs) are induced through the modulation of the local refractive index of the neighboring dielectric medium. This change is enabled through light-induced surface reorientation of a nematic liquid crystal in contact with a nanometer-thin photoalignment layer coating the GNR film. The presence of isolated and well distributed GNRs, both before and after the photoalignment layer deposition, is shown through atomic force and scanning electron microscopy. Exposure of the photoalignment layer to polarized light is shown to reorient aligned nematic liquid crystal molecules to an orthogonal direction, thereby changing the local refractive index of the medium in close proximity to the GNR film. This large change in the local dielectric strength is shown to cause a broad red shift of the localized plasmonic longitudinal resonance and almost no shift in the local transverse resonance. The ability to remotely and quickly change the plasmonic properties of this GNR system marks a breakthrough towards the realization of all-optical plasmonic and photonic devices such as plasmonic colour filters.
C1 [De Sio, Luciano; Serak, Svetlana; Tabiryan, Nelson] Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
[De Sio, Luciano; Tone, Caterina Maria; Umeton, Cesare] Univ Calabria, Dept Phys, I-87036 Arcavacata Di Rende, Italy.
[De Sio, Luciano; Tone, Caterina Maria; Umeton, Cesare] Univ Calabria, Ctr Excellence Study Innovat Funct Mat, I-87036 Arcavacata Di Rende, Italy.
[Klein, Gerard; Cunningham, Alastair; Buergi, Thomas] Univ Geneva, Dept Chim Phys, CH-1211 Geneva, Switzerland.
[Tone, Caterina Maria; Ciuchi, Federica; Umeton, Cesare] CNR IPCF UOS, I-87036 Cosenza, Arcavacata Di R, Italy.
[Bunning, Timothy] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP De Sio, L (reprint author), Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
EM luciano.desio@fis.unical.it
RI mazzulla, alfredo/D-9841-2013; Ciuchi, Federica/F-2164-2013; Burgi,
Thomas/N-4907-2016;
OI mazzulla, alfredo/0000-0002-1938-3959; Burgi,
Thomas/0000-0003-0906-082X; CIUCHI, Federica/0000-0001-6898-7567
FU U.S. Air Force Office of Scientific Research (USAFOSR), Air Force
Material Command (AFMC), U.S. Air Force [FA8655-12-1-003]
FX Authors are grateful to Giovanni Desiderio for his help in the SEM
analysis and to Giovanna Palermo for helping in the data analysis. This
research has been supported by the U.S. Air Force Office of Scientific
Research (USAFOSR), Air Force Material Command (AFMC), U.S. Air Force,
under grant FA8655-12-1-003 (P.I. L. De Sio).
NR 18
TC 16
Z9 16
U1 2
U2 22
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 2050-7526
EI 2050-7534
J9 J MATER CHEM C
JI J. Mater. Chem. C
PY 2013
VL 1
IS 45
BP 7483
EP 7487
DI 10.1039/c3tc31733a
PG 5
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 247UP
UT WOS:000326648100003
ER
PT S
AU Rumi, M
Tondiglia, VP
Natarajan, LV
White, TJ
Bunning, TJ
AF Rumi, Mariacristina
Tondiglia, Vincent P.
Natarajan, Lalgudi V.
White, Timothy J.
Bunning, Timothy J.
BE Khoo, IC
TI Effects of in-plane electric fields on the optical properties of
cholesteric liquid crystals
SO LIQUID CRYSTALS XVII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Liquid Crystals XVII
CY AUG 25-28, 2013
CL San Diego, CA
SP SPIE, EMD Millipore Corp (d b a EMD Chem)
DE Cholesteric liquid crystals; in-plane switching; interdigitated
electrodes; microspectrometer
ID COLOR
AB A considerable body of knowledge has been developed on the general behavior of cholesteric liquid crystal (CLC) materials in electric fields. One approach that has been reported to achieve tunability in optical filters based on CLCs with a positive dielectric anisotropy and in the planar homogeneous state involves the application of electric fields perpendicular to the axis of the CLC helix. The field leads to a progressive unwinding of the helix and a corresponding red-shift in the position of the reflection band of the CLC. In this work, a microspectrophotometer was employed to probe the spatial heterogeneity of the optical spectra of the CLC in cells with interdigitated electrodes. We will show that a complex behavior of the Bragg reflection band is obtained in the gap between electrodes for certain parameters of cells with interdigitated electrodes as a function of the applied field. This is ascribed to variations in the field magnitude and direction in the cell, which lead to a spatial variation of helix unwinding.
C1 [Rumi, Mariacristina; Tondiglia, Vincent P.; Natarajan, Lalgudi V.; White, Timothy J.; Bunning, Timothy J.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Rumi, M (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RI Rumi, Mariacristina/C-9474-2009; White, Timothy/D-4392-2012
OI Rumi, Mariacristina/0000-0002-4597-9617;
NR 16
TC 4
Z9 4
U1 0
U2 6
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9678-2
J9 PROC SPIE
PY 2013
VL 8828
AR 882817
DI 10.1117/12.2023282
PG 12
WC Crystallography; Optics
SC Crystallography; Optics
GA BHU76
UT WOS:000326702100022
ER
PT S
AU Mukhopadhyay, S
Maurer, R
Wolff, R
Mitchell, S
Guss, P
AF Mukhopadhyay, Sanjoy
Maurer, Richard
Wolff, Ronald
Mitchell, Stephen
Guss, Paul
BE Grim, GP
Barber, HB
TI Real-time active cosmic neutron background reduction methods
SO PENETRATING RADIATION SYSTEMS AND APPLICATIONS XIV
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Penetrating Radiation Systems and Applications XIV
CY AUG 28, 2013
CL San Diego, CA
SP SPIE
DE Neutron counting; cosmic background; ship effect; spallation neutrons;
Feynman variance Y2F; neutron shielding; electronic veto; time
correlation
AB Neutron counting using large arrays of pressurized He-3 proportional counters from an aerial system or in a maritime environment suffers from the background counts from the primary cosmic neutrons and secondary neutrons caused by cosmic ray. induced mechanisms like spallation and charge-exchange reaction. This paper reports the work performed at the Remote Sensing Laboratory-Andrews (RSL-A) and results obtained when using two different methods to reduce the cosmic neutron background in real time. Both methods used shielding materials with a high concentration (up to 30% by weight) of neutron-absorbing materials, such as natural boron, to remove the low-energy neutron flux from the cosmic background as the first step of the background reduction process. Our first method was to design, prototype, and test an up-looking plastic scintillator (BC-400, manufactured by Saint Gobain Corporation) to tag the cosmic neutrons and then create a logic pulse of a fixed time duration (similar to 120 mu s) to block the data taken by the neutron counter (pressurized He-3 tubes running in a proportional counter mode). The second method examined the time correlation between the arrival of two successive neutron signals to the counting array and calculated the excess of variance (Feynman variance Y2F)(1) in the neutron count distribution from Poisson distribution. The dilution of this variance from cosmic background values ideally would signal the presence of man-made neutrons.(2) The first method has been technically successful in tagging the neutrons in the cosmic-ray flux and preventing them from being counted in the He-3 tube array by electronic veto-field measurement work shows the efficiency of the electronic veto counter to be about 87%. The second method has successfully derived an empirical relationship between the percentile non-cosmic component in a neutron flux and the Y2F of the measured neutron count distribution. By using shielding materials alone, approximately 55% of the neutron flux from man-made sources like Cf-252 or Am-Be was removed.
C1 [Mukhopadhyay, Sanjoy; Maurer, Richard; Wolff, Ronald] Remote Sensing Lab Andrews Operat, Andrews AFB, MD 20762 USA.
RP Mukhopadhyay, S (reprint author), Remote Sensing Lab Andrews Operat, 1783 Arnold Ave, Andrews AFB, MD 20762 USA.
NR 7
TC 0
Z9 0
U1 1
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9704-8
J9 PROC SPIE
PY 2013
VL 8854
AR 885408
DI 10.1117/12.2020895
PG 11
WC Optics; Physics, Applied
SC Optics; Physics
GA BHV31
UT WOS:000326732100004
ER
PT S
AU Cowan, VM
Treider, LA
Morath, CP
Tian, ZB
Nutan
Gautum
Krishna, S
AF Cowan, Vincent M.
Treider, Laura A.
Morath, Christian P.
Tian, Zhaobing
Nutan
Gautum
Krishna, Sanjay
BE Taylor, EW
Cardimona, DA
TI Radiation tolerance of type-II strained layer superlattice-based
interband cascade infrared photodetectors (ICIP)
SO NANOPHOTONICS AND MACROPHOTONICS FOR SPACE ENVIRONMENTS VII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanophotonics and Macrophotonics for Space Environments
VII
CY AUG 25-27, 2013
CL San Diego, CA
SP SPIE
DE interband cascade infrared photodetector (ICIP); InAs/GaSb; IR;
superlattice; infrared
AB For space-based imaging systems radiation tolerance to both displacement damage and total ionizing dose (TID) radiation effects continues to be a major performance concern. Here, the TID and proton irradiance tolerance of mid wave infrared interband cascade infrared photodetectors (ICIPs) based on InAs/GaSb type II strained-layer superlattice (T2SLS) absorbers is presented. Protons of energy of 63 MeV were used to irradiate the unbiased ICIP detectors at room temperature to a proton fluence of 7.5 x 10(11) protons/cm(2), corresponding to a TID of 100 kRads(Si). A comparison of the detector performance of a variety of ICIPs with different numbers of electron barrier sizes cascade stages is presented. Performance of detectors of varying size was characterized by dark current and quantum efficiency measurements at different temperatures. Results show changes, increase in dark current and a reduction in the quantum efficiency, consistent with an increase in the trap density.
C1 [Cowan, Vincent M.; Treider, Laura A.; Morath, Christian P.] Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Cowan, VM (reprint author), Air Force Res Lab, Space Vehicles Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM vincent.cowan@us.af.mil
NR 4
TC 0
Z9 0
U1 0
U2 8
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9726-0
J9 PROC SPIE
PY 2013
VL 8876
DI 10.1117/12.2022529
PG 8
WC Optics; Physics, Applied
SC Optics; Physics
GA BHN56
UT WOS:000325977900007
ER
PT S
AU Hopkins, FK
Walsh, KM
Benken, A
Jones, J
Averett, K
Diggs, DE
Tan, LS
Mou, S
Grote, JG
AF Hopkins, F. Kenneth
Walsh, Kevin M.
Benken, Alexander
Jones, John
Averett, Kent
Diggs, Darnell E.
Tan, Loon-Seng
Mou, Shin
Grote, James G.
BE Taylor, EW
Cardimona, DA
TI Germanium on Silicon to Enable Integrated Photonic Circuits
SO NANOPHOTONICS AND MACROPHOTONICS FOR SPACE ENVIRONMENTS VII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanophotonics and Macrophotonics for Space Environments
VII
CY AUG 25-27, 2013
CL San Diego, CA
SP SPIE
DE integrated photonics; germanium; photodetector
ID SI
AB Electronic circuits alone cannot fully meet future requirements for speed, size, and weight of many sensor systems, such as digital radar technology and as a result, interest in integrated photonic circuits (IPCs) and the hybridization of electronics with photonics is growing. However, many IPC components such as photodetectors are not presently ideal, but germanium has many advantages to enable higher performance designs that can be better incorporated into an IPC. For example, Ge photodetectors offer an enormous responsivity to laser wavelengths near 1.55 mu m at high frequencies to 40GHz, and they can be easily fabricated as part of a planar silicon processing schedule. At the same time, germanium has enormous potential for enabling 1.55 micron lasers on silicon and for enhancing the performance of silicon modulators. Our new effort has begun by studying the deposition of germanium on silicon and beginning to develop methods for processing these films. In initial experiments comparing several common chemical solutions for selective etching under patterned positive photoresist, it was found that hydrogen peroxide (H2O2) at or below room temperature (20 C) produced the sharpest patterns in the Ge films; H2O2 at a higher temperature (50 C) resulted in the greatest lateral etching.
C1 [Hopkins, F. Kenneth; Walsh, Kevin M.; Benken, Alexander; Jones, John; Averett, Kent; Diggs, Darnell E.; Tan, Loon-Seng; Mou, Shin; Grote, James G.] AF Res Lab, Mat & Mfg Directorate, Wright Patterson Afb, OH 45433 USA.
RP Hopkins, FK (reprint author), AF Res Lab, Mat & Mfg Directorate, Wright Patterson Afb, OH 45433 USA.
RI Tan, Loon-Seng/F-6985-2012
OI Tan, Loon-Seng/0000-0002-2134-9290
NR 11
TC 0
Z9 0
U1 0
U2 7
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9726-0
J9 PROC SPIE
PY 2013
VL 8876
DI 10.1117/12.2025186
PG 5
WC Optics; Physics, Applied
SC Optics; Physics
GA BHN56
UT WOS:000325977900025
ER
PT S
AU Treider, LA
Cowan, VM
Morath, CP
Tian, ZB
Krishna, S
AF Treider, Laura A.
Cowan, Vincent M.
Morath, Christian P.
Tian, Zhaobing
Krishna, Sanjay
BE Taylor, EW
Cardimona, DA
TI Noise spectrum measurements of a midwave, interband cascade infrared
photodetector with 33 nm wide electron barrier
SO NANOPHOTONICS AND MACROPHOTONICS FOR SPACE ENVIRONMENTS VII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanophotonics and Macrophotonics for Space Environments
VII
CY AUG 25-27, 2013
CL San Diego, CA
SP SPIE
DE interband cascade infrared photodetector (ICIP); InAs/GaSb; noise;
infrared detector
AB Interband cascade infrared photodetectors (ICIPs) potentially offer mid-wave infrared detection at very high operating temperatures due to their nearly ideal photovoltaic operation. An ICIP typically makes use of several cascade stages grown in series, each of which consists of an active absorption region with a mid-wave cutoff wavelength, an intra-band relaxation region for electron transport and an inter-band tunneling region to enable electron transport to the next stage. The latter two also effectively act as a hole-barrier (hB) and an electron-barrier (eB), respectively, forming a preferential path for each carrier. Here, an ICIP with a relatively large eB was investigated. One of the key parameters to measure for detector performance is the noise spectrum, particularly to observe the behavior at low frequencies where the noise is often much larger than estimates based on the ideal shot noise expression would predict. This paper presents the results of noise spectrum measurements of differently sized ICIP devices, taken using an external trans-impedance amplifier with a cooled, internal impedance converter and a cooled feedback resistor. Measurements were taken at different operating temperatures and voltage biases in order to determine the noise-dependence on each.
C1 [Treider, Laura A.; Cowan, Vincent M.; Morath, Christian P.] Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Treider, LA (reprint author), Air Force Res Lab, Space Vehicles Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM laura.treider@us.af.mil
NR 9
TC 0
Z9 0
U1 0
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9726-0
J9 PROC SPIE
PY 2013
VL 8876
DI 10.1117/12.2026817
PG 10
WC Optics; Physics, Applied
SC Optics; Physics
GA BHN56
UT WOS:000325977900008
ER
PT S
AU Kim, RS
Szep, A
Usechak, NG
You, Y
AF Kim, Richard S.
Szep, Attila
Usechak, Nicholas G.
You, YoungHwan
BE Eich, M
Nunzi, JM
Jakubiak, R
TI Design Considerations for Monolithic Beam Formers Based on Electro-Optic
Polymer Phase Modulators and Strain-Induced Optical Waveguides
SO OPTICAL PROCESSES IN ORGANIC MATERIALS AND NANOSTRUCTURES II
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Optical Processes in Organic Materials and Nanostructures
II
CY AUG 25-28, 2013
CL San Diego, CA
SP SPIE, EMD Millipore Corp (d b a EMD Chem)
DE Electro-optic polymers; Waveguide modulators; Polymer waveguides;
Integrated optics devices; Phased-array imaging systems
AB The fabrication and characterization of a 1x4-element integrated beam former based on electro-optic (EO) polymer phase modulators (PM) is summarized including findings related to waveguide loss, near-, and far-field diffraction patterns. Based on this device, two alternate designs are proposed to improve performance: an unequally spaced 1x4-element and an equally spaced 1x8-element beam former both based on EO polymer PMs. Models of these alternative designs indicate that waveguide propagation loss and strong grating lobes, both of which degraded the performance of the initial device, can be substantially improved. The proposed approach explored by the 8-element beam former introduces novel components including strain-induced optical waveguides, hybrid integration of active and passive polymers, modified waveguide diffraction aperture, and directional coupler thermo-optic (TO) switches.
C1 [Kim, Richard S.; Szep, Attila; Usechak, Nicholas G.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Kim, RS (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 6
TC 0
Z9 0
U1 1
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9677-5
J9 PROC SPIE
PY 2013
VL 8827
AR UNSP 88270M
DI 10.1117/12.2022639
PG 4
WC Nanoscience & Nanotechnology; Optics; Physics, Applied
SC Science & Technology - Other Topics; Optics; Physics
GA BHM62
UT WOS:000325928800012
ER
PT J
AU Tseng, CC
Parthasarathy, TA
Sikorski, RL
Viskanta, R
Chen, MY
AF Tseng, Charles C.
Parthasarathy, Triplicane A.
Sikorski, Ruth L.
Viskanta, Raymond
Chen, Ming Y.
TI Effect of thermal radiation on the effective thermal conductivity of
open-cell SiC foams
SO HIGH TEMPERATURES-HIGH PRESSURES
LA English
DT Article
DE Open-cell foams; silicon carbide; high temperature; effective thermal
conductivity; thermal radiation; thermal protection
ID SILICON-CARBIDE; HEAT-TRANSFER; METAL FOAMS
AB To use open-cell foam materials for high temperature applications, thermal radiation may be important or dominate heat transfer in foams; however, the effective thermal conductivity which is one of the most important thermal characteristics of foams is difficult to estimate due to the fact that studies based on detailed thermal radiation analysis are limited. In this paper foams are considered to be semitransparent, because radiation can penetrate through the pore (or void) space and/or foam skeleton (ligament), depending on the materials from which the foams are made. Of particular interest in this study is to create a model that includes the effect of the foam physical properties (such as its density, mean cell size, etc.) on the conductive and the radiative transfer through silicon carbide (SiC) foams for predicting the temperature dependent effective thermal conductivity. In the paper, the dimensionless strut diameter is considered to be an important physical parameter of foams. The attenuation/extinction behavior of SiC foams is considered to be a function of the dimensionless strut diameter of the foam. The results reveal that the foam physical properties can significantly reduce the effective thermal conductivity of the foam used for the thermal protection.
C1 [Tseng, Charles C.; Parthasarathy, Triplicane A.; Sikorski, Ruth L.; Chen, Ming Y.] AF Res Lab, Wright Patterson Afb, OH 45433 USA.
[Viskanta, Raymond] Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
[Tseng, Charles C.; Parthasarathy, Triplicane A.] UES, Dayton, OH 45432 USA.
RP Chen, MY (reprint author), AF Res Lab, Wright Patterson Afb, OH 45433 USA.
EM ming-yung.chen@wpafb.af.mil
FU Air Force Research Laboratory at Wright-Patterson AFB
[FA8650-07-D-5800]; computer time from the DOD High Performance
Computing Modernization; Air Force Research Laboratory at the
Wright-Patterson AFB
FX This study was supported by the Air Force Research Laboratory at
Wright-Patterson AFB under the contract number of FA8650-07-D-5800. This
work was supported in part by a grant of computer time from the DOD High
Performance Computing Modernization Program of the Air Force Research
Laboratory at the Wright-Patterson AFB.
NR 24
TC 1
Z9 1
U1 1
U2 9
PU OLD CITY PUBLISHING INC
PI PHILADELPHIA
PA 628 NORTH 2ND ST, PHILADELPHIA, PA 19123 USA
SN 0018-1544
EI 1472-3441
J9 HIGH TEMP-HIGH PRESS
JI High Temp.-High Press.
PY 2013
VL 42
IS 5
BP 387
EP 403
PG 17
WC Thermodynamics; Mechanics; Materials Science, Characterization & Testing
SC Thermodynamics; Mechanics; Materials Science
GA 242PJ
UT WOS:000326254200001
ER
PT S
AU De Sio, L
Tabiryan, N
Bunning, T
Kimball, BR
Umeton, C
AF De Sio, Luciano
Tabiryan, Nelson
Bunning, Timothy
Kimball, Brian R.
Umeton, Cesare
BE Wolf, E
TI Dynamic Photonic Materials Based on Liquid Crystals
SO PROGRESS IN OPTICS, VOL 58
SE Progress in Optics
LA English
DT Review; Book Chapter
ID HOLOGRAPHIC GRATINGS; GOLD NANOPARTICLES; ELECTROOPTICAL PROPERTIES;
SWITCHING PROPERTIES; PLASMONIC RESONANCE; COMPOSITE-MATERIALS;
SWITCHABLE MIRRORS; PHASE-SEPARATION; BRAGG GRATINGS; DIFFRACTION
C1 [De Sio, Luciano; Umeton, Cesare] Univ Calabria, Inst Chem Phys Proc IPCF CNR, UOS Cosenza, Dept Phys, I-87036 Arcavacata Di Rende, Italy.
[De Sio, Luciano; Umeton, Cesare] Univ Calabria, Inst Chem Phys Proc IPCF CNR, UOS Cosenza, Ctr Excellence Study Innovat Funct Mat CEMIF CAL, I-87036 Arcavacata Di Rende, Italy.
[Tabiryan, Nelson] Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
[Bunning, Timothy] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Kimball, Brian R.] US Army Natick Soldier Res Dev & Engn Ctr, Natick, MA 01760 USA.
RP De Sio, L (reprint author), Univ Calabria, Inst Chem Phys Proc IPCF CNR, UOS Cosenza, Dept Phys, I-87036 Arcavacata Di Rende, Italy.
NR 103
TC 6
Z9 6
U1 7
U2 29
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0079-6638
BN 978-0-444-62654-7; 978-0-444-62644-8
J9 PROG OPTICS
JI Prog. Opt.
PY 2013
VL 58
BP 1
EP 64
DI 10.1016/B978-0-444-62644-8.00001-7
PG 64
WC Optics
SC Optics
GA BHP28
UT WOS:000326234900002
ER
PT J
AU Kumar, S
Selvaraj, C
Munichandraiah, N
Scanlon, LG
AF Kumar, Surender
Selvaraj, C.
Munichandraiah, N.
Scanlon, L. G.
TI Gold nanoparticles anchored reduced graphene oxide as catalyst for
oxygen electrode of rechargeable Li-O-2 cells
SO RSC ADVANCES
LA English
DT Article
ID LITHIUM-AIR BATTERIES; CARBON-DIOXIDE; REDUCTION; CAPACITY;
SPECTROSCOPY; PERFORMANCE; SUPEROXIDE; COMPOSITE
AB Gold nanoparticles decorated reduced graphene oxide (Au-RGO) catalyst for O-2 electrode is prepared by in situ reduction of Au3+ ions and graphene oxide dispersed in water. The Au nanoparticles are uniformly distributed on the two-dimensional RGO layers. Li-O-2 cells assembled in a non-aqueous electrolyte using Au-RGO catalyst exhibit an initial discharge capacity as high as 5.89 mA h cm-(2) (5230 mA h g(-1))at a current density of 0.1 mA cm(-2). The voltage gap between the charge and discharge curves is less for Li-O-2(Au-RGO) cell in comparison with Li-O-2(RGO) cell. The Li-O-2(Au-RGO) cells are cycled over about 120 charge-discharge cycles. The results suggest that Au-RGO is a promising catalyst for rechargeable Li-O-2 cells.
C1 [Kumar, Surender; Selvaraj, C.; Munichandraiah, N.] Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India.
[Scanlon, L. G.] Air Force Res Lab, Elect Syst Branch, Wright Patterson AFB, OH 45433 USA.
RP Munichandraiah, N (reprint author), Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India.
EM muni@ipc.iisc.ernet.in
FU Asian Office of Aerospace Research and Development (AOARD) of the U.S.
Air Force [FA2386-13-1-4006]
FX The authors thank the Asian Office of Aerospace Research and Development
(AOARD) of the U.S. Air Force for their financial support (award no.
FA2386-13-1-4006) and Dr T. Low and Dr R. Pon of AOARD for their keen
interest in this work. Dr Stanley Rodrigues and Dr Padmakar Kichambare
of AFRL are thanked for useful discussions.
NR 48
TC 16
Z9 16
U1 3
U2 59
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 2046-2069
J9 RSC ADV
JI RSC Adv.
PY 2013
VL 3
IS 44
BP 21706
EP 21714
DI 10.1039/c3ra42617c
PG 9
WC Chemistry, Multidisciplinary
SC Chemistry
GA 239WM
UT WOS:000326056600087
ER
PT B
AU Cross, S
Vukadinovic, R
AF Cross, Sharyl
Vukadinovic, Radovan
BE Cross, S
Kentera, S
Nation, RC
Vukadinovic, R
TI Shaping the Twenty-First Century International Security Community in
South East Europe and Beyond: An Introduction
SO SHAPING SOUTH EAST EUROPE'S SECURITY COMMUNITY FOR THE TWENTY-FIRST
CENTURY: TRUST, PARTNERSHIP, INTEGRATION
SE New Security Challenges
LA English
DT Article; Book Chapter
C1 [Cross, Sharyl] US Air Force Acad, George C Marshall European Ctr Secur Studies, Coll Int & Secur Studies, Colorado Springs, CO 80840 USA.
[Cross, Sharyl] US Air Force Acad, Colorado Springs, CO 80840 USA.
[Vukadinovic, Radovan] Univ Zagreb, Fac Polit Sci, Zagreb 41000, Croatia.
RP Cross, S (reprint author), US Air Force Acad, George C Marshall European Ctr Secur Studies, Coll Int & Secur Studies, Colorado Springs, CO 80840 USA.
OI Crosson, Sean/0000-0002-3026-0968
NR 30
TC 1
Z9 1
U1 0
U2 0
PU PALGRAVE
PI BASINGSTOKE
PA HOUNDMILLS, BASINGSTOKE RG21 6XS, ENGLAND
BN 978-1-137-01020-9; 978-1-137-01019-3
J9 NEW SECUR CHALL
PY 2013
BP 1
EP 27
D2 10.1057/9781137010209
PG 27
WC International Relations; Political Science
SC International Relations; Government & Law
GA BHO97
UT WOS:000326192700002
ER
PT B
AU Krasteva, A
Cervone, A
Pilch, FT
AF Krasteva, Anna
Cervone, Alberto
Pilch, Frances T.
BE Cross, S
Kentera, S
Nation, RC
Vukadinovic, R
TI Transnational Migration and Demographic Security Challenges
SO SHAPING SOUTH EAST EUROPE'S SECURITY COMMUNITY FOR THE TWENTY-FIRST
CENTURY: TRUST, PARTNERSHIP, INTEGRATION
SE New Security Challenges
LA English
DT Article; Book Chapter
C1 [Krasteva, Anna] New Bulgarian Univ, Ctr Refugees Migrat & Ethn Studies CERMES, Sofia, Bulgaria.
[Pilch, Frances T.] US Air Force Acad, Dept Polit Sci, Div Int Relat & Natl Secur, Colorado Springs, CO 80840 USA.
RP Krasteva, A (reprint author), New Bulgarian Univ, Ctr Refugees Migrat & Ethn Studies CERMES, Sofia, Bulgaria.
NR 45
TC 0
Z9 0
U1 0
U2 2
PU PALGRAVE
PI BASINGSTOKE
PA HOUNDMILLS, BASINGSTOKE RG21 6XS, ENGLAND
BN 978-1-137-01020-9; 978-1-137-01019-3
J9 NEW SECUR CHALL
PY 2013
BP 166
EP 196
D2 10.1057/9781137010209
PG 31
WC International Relations; Political Science
SC International Relations; Government & Law
GA BHO97
UT WOS:000326192700010
ER
PT J
AU Perlovsky, L
AF Perlovsky, Leonid
BE Pereira, A
Lehmann, D
TI A cognitive model of language and conscious processes
SO UNITY OF MIND, BRAIN AND WORLD: CURRENT PERSPECTIVES ON A SCIENCE OF
CONSCIOUSNESS
LA English
DT Article; Book Chapter
ID BASIC EMOTIONS; NEURAL-NETWORK; RECOGNITION; HEURISTICS
C1 [Perlovsky, Leonid] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Perlovsky, L (reprint author), Harvard Univ, Athinoula A Martinos Ctr Biomed Imaging, Cambridge, MA 02138 USA.
NR 85
TC 2
Z9 2
U1 0
U2 0
PU CAMBRIDGE UNIV PRESS
PI CAMBRIDGE
PA THE PITT BUILDING, TRUMPINGTON ST, CAMBRIDGE CB2 1RP, CAMBS, ENGLAND
BN 978-1-107-02629-2
PY 2013
BP 265
EP 298
PG 34
WC Psychology, Clinical
SC Psychology
GA BHO37
UT WOS:000326088200010
ER
PT S
AU Bayya, SS
Villalobos, GR
Hunt, MP
Sanghera, JS
Sadowski, BM
Aggarwal, ID
Cinibulk, M
Carney, C
Keller, K
AF Bayya, Shyam S.
Villalobos, Guillermo R.
Hunt, Michael P.
Sanghera, Jasbinder S.
Sadowski, Bryan M.
Aggarwal, Ishwar D.
Cinibulk, Michael
Carney, Carmen
Keller, Kristin
BE Robichaud, JL
Krodel, M
Goodman, WA
TI Development of Transparent Polycrystalline Beta-Silicon Carbide
SO MATERIAL TECHNOLOGIES AND APPLICATIONS TO OPTICS, STRUCTURES,
COMPONENTS, AND SUB-SYSTEMS
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Material Technologies and Applications to Optics,
Structures, Components, and Sub-Systems
CY AUG 26-28, 2013
CL San Diego, CA
SP SPIE
DE silicon carbide; transparent; ceramic; sol-gel; Field Assisted Sintering
Technology (FAST)
ID REDUCTION
AB Transparent beta-SiC is of great interest because its high strength, low coefficient of thermal expansion, very high thermal conductivity, and cubic crystal structure give it a very high thermal shock resistance. A transparent, polycrystalline beta- SiC window will find applications in armor, hypersonic missiles, and thermal control for thin disc lasers. SiC is currently available as either small transparent vapor grown disks or larger opaque shapes. Neither of which are useful in window applications. We are developing sintering technology to enable transparent SiC ceramics. This involves developing procedures to make high purity powders and studying their densification behavior. We have been successful in demonstrating transparency in thin sections using Field Assisted Sintering Technology (FAST). This paper will discuss the reaction mechanisms in the formation of beta-SiC powder and its sintering behavior in producing transparent ceramics.
C1 [Bayya, Shyam S.; Villalobos, Guillermo R.; Sanghera, Jasbinder S.] Naval Res Lab, Code 5622,4555 Overlook Ave SW, Washington, DC 20375 USA.
[Hunt, Michael P.] Univ Res Fdn, Greenbelt, MD 20770 USA.
[Sadowski, Bryan M.] Air Force Def Solut, Herndon, VA 20171 USA.
[Cinibulk, Michael] US Air Force, Res Lab, Wright Patterson AFB, OH USA.
[Carney, Carmen; Keller, Kristin] UES Inc, Dayton, OH USA.
RP Bayya, SS (reprint author), Naval Res Lab, Code 5622,4555 Overlook Ave SW, Washington, DC 20375 USA.
NR 12
TC 2
Z9 2
U1 1
U2 11
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9687-4
J9 PROC SPIE
PY 2013
VL 8837
AR UNSP 88370S
DI 10.1117/12.2023954
PG 7
WC Materials Science, Multidisciplinary; Optics
SC Materials Science; Optics
GA BHN37
UT WOS:000325971100024
ER
PT S
AU Giannandrea, A
Raqueno, N
Messinger, DW
Faulring, J
Kerekes, JP
van Aardt, J
Canham, K
Hagstrom, S
Ontiveros, E
Gerace, A
Kaufman, J
Vongsy, KM
Griffith, H
Bartlett, BD
Ientilucci, E
Meola, J
Scarff, L
Daniel, B
AF Giannandrea, AnneMarie
Raqueno, Nina
Messinger, David W.
Faulring, Jason
Kerekes, John P.
van Aardt, Jan
Canham, Kelly
Hagstrom, Shea
Ontiveros, Erin
Gerace, Aaron
Kaufman, Jason
Vongsy, Karmon M.
Griffith, Heather
Bartlett, Brent D.
Ientilucci, Emmett
Meola, Joesph
Scarff, Lauwrence
Daniel, Brian
BE Shen, SS
Lewis, PE
TI The SHARE 2012 Data Campaign
SO ALGORITHMS AND TECHNOLOGIES FOR MULTISPECTRAL, HYPERSPECTRAL, AND
ULTRASPECTRAL IMAGERY XIX
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Algorithms and Technologies for Multispectral,
Hyperspectral, and Ultraspectral Imagery XIX
CY APR 29-MAY 02, 2013
CL Baltimore, MD
SP SPIE
DE Data Collection; Hyperspectral; Ground Truth; HSI Dataset; HSI
Signatures; LiDAR; Target Detection
ID HYPERSPECTRAL COLLECTION EXPERIMENT; MEGACOLLECT 2004; ROCHESTER
AB A multi-modal (hyperspectral, multispectral, and LIDAR) imaging data collection campaign was conducted just south of Rochester New York in Avon, NY on September 20, 2012 by the Rochester Institute of Technology (RIT) in conjunction with SpecTIR, LLC, the Air Force Research Lab (AFRL), the Naval Research Lab (NRL), United Technologies Aerospace Systems (UTAS) and MITRE. The campaign was a follow on from the SpecTIR Hyperspectral Airborne Rochester Experiment (SHARE) from 2010. Data was collected in support of the eleven simultaneous experiments described here. The airborne imagery was collected over four different sites with hyperspectral, multispectral, and LIDAR sensors. The sites for data collection included Avon, NY, Conesus Lake, Hemlock Lake and forest, and a nearby quarry. Experiments included topics such as target unmixing, subpixel detection, material identification, impacts of illumination on materials, forest health, and in-water target detection. An extensive ground truthing effort was conducted in addition to collection of the airborne imagery. The ultimate goal of the data collection campaign is to provide the remote sensing community with a shareable resource to support future research. This paper details the experiments conducted and the data that was collected during this campaign.
C1 [Giannandrea, AnneMarie; Raqueno, Nina; Messinger, David W.; Faulring, Jason; Kerekes, John P.; van Aardt, Jan; Canham, Kelly; Hagstrom, Shea; Ontiveros, Erin; Gerace, Aaron; Ientilucci, Emmett] Rochester Inst Technol, 1 Lomb Mem Dr, Rochester, NY 14623 USA.
[Kaufman, Jason; Vongsy, Karmon M.; Meola, Joesph] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Griffith, Heather] United Technol Aerosp Syst, Westford, MA 01886 USA.
[Bartlett, Brent D.] Mitre Corp, 7525 Colshire Dr, Mclean, VA 22102 USA.
[Daniel, Brian] US Naval Acad, Res Lab, Washington, DC 20375 USA.
RP Giannandrea, A (reprint author), Rochester Inst Technol, 1 Lomb Mem Dr, Rochester, NY 14623 USA.
EM amg4587@rit.edu; nina@cis.rit.edu
FU Digital Imaging and Remote Sensing Laboratory (DIRS), Exelis; United
Technologies Aerospace Systems (UTAS); NRL; UTAS; AFRL; MITRE; RITRE;
SUNY
FX Funding for this project was provided by the Digital Imaging and Remote
Sensing Laboratory (DIRS), Exelis, and United Technologies Aerospace
Systems (UTAS). The authors would like to thank Exelis, NRL, UTAS, AFRL,
MITRE, and RITRE for their involvement in this project. They would also
like to thank SUNY Brockport for the use of their meteorological
equipment.
NR 14
TC 8
Z9 8
U1 0
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9534-1
J9 PROC SPIE
PY 2013
VL 8743
AR UNSP 87430F
DI 10.1117/12.2015935
PG 15
WC Optics; Spectroscopy
SC Optics; Spectroscopy
GA BHH00
UT WOS:000325394800011
ER
PT S
AU Givens, RN
Walli, KC
Eismann, MT
AF Givens, Ryan N.
Walli, Karl C.
Eismann, Michael T.
BE Shen, SS
Lewis, PE
TI A method to generate sub-pixel classification maps for use in DIRSIG
three-dimensional models
SO ALGORITHMS AND TECHNOLOGIES FOR MULTISPECTRAL, HYPERSPECTRAL, AND
ULTRASPECTRAL IMAGERY XIX
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Algorithms and Technologies for Multispectral,
Hyperspectral, and Ultraspectral Imagery XIX
CY APR 29-MAY 02, 2013
CL Baltimore, MD
SP SPIE
DE Registration; fusion; synthetic imagery; DIRSIG; hyperspectral imagery;
classification
AB Developing new remote sensing instruments is a costly and time consuming process. The Digital Imaging and Remote Sensing Image Generation (DIRSIG) model gives users the ability to create synthetic images for a proposed sensor before building it. However, to produce synthetic images, DIRSIG requires facetized, three-dimensional models attributed with spectral and texture information which can themselves be costly and time consuming to produce. Recent work has been successful in generating these scenes using an automated method when coincident Hyper Spectral Imagery (HSI), LIght Detection and Ranging (LIDAR), and high-resolution imagery of a site are available. An important step in this process is attributing the three-dimensional information gained from the LIDAR with spectral information gained from the HSI. Previous work was able to do this attribution at the resolution of the HSI, but the HSI is generally at the lowest resolution of the three modalities. Due to the highly accurate method used to register the HSI, LIDAR, and high-resolution imagery, the potential for bringing additional information into the classification process exists. This paper will present a method to generate classification maps at or near the resolution of the high-resolution imagery component of the fused imagery. Initial results using this new method are provided and are promising in terms of their ability to ultimately help produce higher fidelity DIRSIG models.
C1 [Givens, Ryan N.; Walli, Karl C.] US Air Force, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Eismann, Michael T.] US Air Force, Wright Patterson AFB, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Givens, RN (reprint author), US Air Force, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
NR 8
TC 1
Z9 1
U1 0
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9534-1
J9 PROC SPIE
PY 2013
VL 8743
AR 87430Q
DI 10.1117/12.2015397
PG 9
WC Optics; Spectroscopy
SC Optics; Spectroscopy
GA BHH00
UT WOS:000325394800022
ER
PT S
AU Meola, J
Absi, A
Leonard, JD
Ifarraguerri, AI
Islam, MN
Alexander, VV
Zadnik, J
AF Meola, Joseph
Absi, Anthony
Leonard, James D.
Ifarraguerri, Agustin I.
Islam, Mohammed N.
Alexander, Vinay V.
Zadnik, Jerome
BE Shen, SS
Lewis, PE
TI Modeling, development, and testing of a shortwave infrared
supercontinuum laser source for use in active hyperspectral imaging
SO ALGORITHMS AND TECHNOLOGIES FOR MULTISPECTRAL, HYPERSPECTRAL, AND
ULTRASPECTRAL IMAGERY XIX
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Algorithms and Technologies for Multispectral,
Hyperspectral, and Ultraspectral Imagery XIX
CY APR 29-MAY 02, 2013
CL Baltimore, MD
SP SPIE
DE hyperspectral; supercontinuum; active; shortwave infrared
AB A fundamental limitation of current visible through shortwave infrared hyperspectral imaging systems is the dependence on solar illumination. This reliance limits the operability of such systems to small windows during which the sun provides enough solar radiation to achieve adequate signal levels. Similarly, nighttime collection is infeasible. This work discusses the development and testing of a high-powered super-continuum laser for potential use as an on-board illumination source coupled with a hyperspectral receiver to allow for day/night operability. A 5-watt shortwave infrared supercontinuum laser was developed, characterized in the lab, and tower-tested along a 1.6km slant path to demonstrate propagation capability as a spectral light source.
C1 [Meola, Joseph; Absi, Anthony; Leonard, James D.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Meola, J (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 13
TC 0
Z9 0
U1 1
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9534-1
J9 PROC SPIE
PY 2013
VL 8743
AR 87431D
DI 10.1117/12.2015940
PG 12
WC Optics; Spectroscopy
SC Optics; Spectroscopy
GA BHH00
UT WOS:000325394800043
ER
PT S
AU Lu, CA
Flores, A
Bochove, E
Roach, WP
Smirnov, V
Glebov, LB
AF Lu, Chunte A.
Flores, Angel
Bochove, Erik
Roach, William P.
Smirnov, Vadim
Glebov, Leonid B.
BE Hendow, ST
TI Active Coherent Superposition of Five Fiber Amplifiers at 670W using
Multiplexed Volume Bragg Gratings
SO FIBER LASERS X: TECHNOLOGY, SYSTEMS, AND APPLICATIONS
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Fiber Lasers X - Technology, Systems, and Applications
CY FEB 04-07, 2013
CL San Francisco, CA
SP SPIE, NKT Photon A/S, Fianium Ltd, PolarOnyx Inc
DE Fiber laser; Volume gratings; Laser beam combination
AB We present an experimental study on active coherent combining of five Yb (Ytterbium)-doped fiber laser amplifiers that employs multiplexed volume Bragg gratings (MVBGs), reporting a combining efficiency of 82% and near-diffraction limited beam quality at a combined input power of 380 W, and 70% combining efficiency with equal beam quality at 670 W input power.
C1 [Lu, Chunte A.; Flores, Angel; Bochove, Erik; Roach, William P.] Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
RP Lu, CA (reprint author), Air Force Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
NR 13
TC 1
Z9 1
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9370-5
J9 PROC SPIE
PY 2013
VL 8601
AR 86011A
DI 10.1117/12.2001854
PG 6
WC Optics; Physics, Applied
SC Optics; Physics
GA BHE44
UT WOS:000325162800029
ER
PT S
AU Naderi, S
Dajani, I
Madden, T
Ward, B
Robin, C
Grosek, J
AF Naderi, Shadi
Dajani, Iyad
Madden, Timothy
Ward, Benjamin
Robin, Craig
Grosek, Jake
BE Hendow, ST
TI Numerical studies of modal instabilities in high-power fiber amplifiers
SO FIBER LASERS X: TECHNOLOGY, SYSTEMS, AND APPLICATIONS
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Fiber Lasers X - Technology, Systems, and Applications
CY FEB 04-07, 2013
CL San Francisco, CA
SP SPIE, NKT Photon A/S, Fianium Ltd, PolarOnyx Inc
DE Modal instabilities; Yb-doped fiber amplifiers; Gain-tailored fiber;
Photonic crystal fiber; High power fiber amplifiers
ID LASERS
AB We present a detailed time-dependent numerical model of the modal instability phenomenon observed in Yb-doped fiber amplifiers. The thermal effects are captured by solving the heat equation in polar coordinate using a 2D, second-order, time-dependent, alternating direction implicit (ADI) method. The model captures the three power-dependent regions that are characteristic of the transfer of energy between the fundamental mode and the higher-order mode as a function of time. It is also shown that for the fiber configuration investigated, the modal instability threshold scales linearly over a wide range with the seed power. Furthermore, we present numerical results indicating that gain tailoring can increase the threshold. Two different gain-tailored fiber designs are simulated and compared.
C1 [Naderi, Shadi; Dajani, Iyad; Madden, Timothy; Robin, Craig; Grosek, Jake] Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
RP Naderi, S (reprint author), Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
NR 10
TC 1
Z9 1
U1 0
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9370-5
J9 PROC SPIE
PY 2013
VL 8601
AR 86013F
DI 10.1117/12.2006571
PG 7
WC Optics; Physics, Applied
SC Optics; Physics
GA BHE44
UT WOS:000325162800088
ER
PT S
AU Robin, C
Dajani, I
Zernigue, C
Flores, A
Pulford, B
Lanari, A
Naderi, S
AF Robin, Craig
Dajani, Iyad
Zernigue, Clint
Flores, Angel
Pulford, Ben
Lanari, Ann
Naderi, Shadi
BE Hendow, ST
TI Pseudo-random binary sequence phase modulation in high power Yb-doped
fiber amplifiers
SO FIBER LASERS X: TECHNOLOGY, SYSTEMS, AND APPLICATIONS
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Fiber Lasers X - Technology, Systems, and Applications
CY FEB 04-07, 2013
CL San Francisco, CA
SP SPIE, NKT Photon A/S, Fianium Ltd, PolarOnyx Inc
DE PRBS; stimulated Brillouin scattering; fiber amplifier; narrow
linewidth; phase modulation
ID STIMULATED BRILLOUIN-SCATTERING; NOISE
AB We present experimental and theoretical studies on the stimulated Brillouin scattering (SBS) threshold in fiber amplifiers seeded with a spectrally broadened single-frequency laser source. An electro-optic phase modulator is driven with various pseudo-random binary sequence (PRBS) patterns to highlight the unique characteristics of this linewidth broadening technique and its facility in SBS mitigation. Theoretical predictions show a variation in SBS suppression based on PRBS pattern and modulation frequency. These predictions are experimentally investigated in a kilowatt level monolithic fiber amplifier operating with near diffraction-limited beam quality. We also show Rayleigh scattering and other sources of back reflected light in phase modulated signals can seed the SBS process and significantly reduce the nonlinear threshold.
C1 [Robin, Craig; Dajani, Iyad; Flores, Angel; Pulford, Ben; Lanari, Ann; Naderi, Shadi] Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
RP Robin, C (reprint author), Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
NR 12
TC 3
Z9 3
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9370-5
J9 PROC SPIE
PY 2013
VL 8601
AR 86010Z
DI 10.1117/12.2004486
PG 9
WC Optics; Physics, Applied
SC Optics; Physics
GA BHE44
UT WOS:000325162800023
ER
PT S
AU Wang, M
Canteenwala, T
Nalla, V
Tan, LS
Ji, W
Chiang, LY
AF Wang, Min
Canteenwala, Taizoon
Nalla, Venkatram
Tan, Loon-Seng
Ji, Wei
Chiang, Long Y.
BE Guldi, DM
Fenton, JM
Simonian, A
TI Synthesis of C-60-Antenna Nanostructure-Based Fullerosome Vesicles for
Ultrafast Nonlinear Photonic Applications
SO FULLERENES, NANOTUBES, AND CARBON NANOSTRUCTURES - 221ST ECS MEETING
SE ECS Transactions
LA English
DT Proceedings Paper
CT 221st Meeting of the Electrochemical-Society (ECS)
CY MAY 06-10, 2012
CL Seattle, WA
SP Electrochem Soc, Fullerenes, Nanotubes, & Carbon Nanostructures, Energy Technol, Sensor
ID C-60-DIPHENYLAMINOFLUORENE DYAD; PHOTOPHYSICAL PROPERTIES; 2-PHOTON
ABSORPTION; ENERGY-TRANSFER; CROSS-SECTION; C-60; DIPHENYLAMINOFLUORENE;
MOLECULES
AB We designed and synthesized amphiphilic oligo(ethylene glycolated) C-60-(light-harvesting fluorene antenna) nanostructures C-60(>DPAF-EG(12)C(1)) by incorporating a donor-acceptor antenna component of C-60-DPAF with highly hydrophilic oligo(ethylene glycol) (EGn) side-chains to increase the amphiphilicity of the molecule. The chain length of EGn arms was selected to match with the overall molecular radius and to achieve a balance between the hydrophobicity and hydrophilicity of resulting molecules Molecular self-assembly of C-60(>DPAF-EG(12)C(1)) forming bilayered fullerosome nanovesicles led to the observation of ultrafast femtosecond nonlinear optical (NLO) absorption characteristics. Two-photon absorption phenomena were found to be the dominating photophysical events showing a large molar concentration-insensitive 2PA cross-section value equivalent to 8500 GM in a form of vesicles, on average, at the estimated effective nanovesicle concentration as low as 5.5 x 10 (8) MV (molecular molar concentration of 5.0 x 10(-4) M) in H2O.
C1 [Wang, Min; Canteenwala, Taizoon; Chiang, Long Y.] Univ Massachusetts, Dept Chem, Lowell, MA 01854 USA.
[Nalla, Venkatram; Ji, Wei] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore.
[Tan, Loon-Seng] US Air Force, Res Lab, AFRL RXBN, Wright Patterson AFB, OH 45433 USA.
RP Wang, M (reprint author), Univ Massachusetts, Dept Chem, Lowell, MA 01854 USA.
RI Nalla, Venkatram/A-2139-2009; Tan, Loon-Seng/F-6985-2012
OI Nalla, Venkatram/0000-0003-4535-290X; Tan, Loon-Seng/0000-0002-2134-9290
FU Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0380,
FA9550-09-1-0183]; National University of Singapore [R-144-000-213-112]
FX The authors at UML thank the financial support of Air Force Office of
Scientific Research (AFOSR) under the grant number FA9550-09-1-0380 and
FA9550-09-1-0183. The authors are also grateful to the financial support
from the National University of Singapore under the research Grant
number R-144-000-213-112.
NR 20
TC 0
Z9 0
U1 0
U2 8
PU ELECTROCHEMICAL SOC INC
PI PENNINGTON
PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA
SN 1938-5862
BN 978-1-60768-388-9; 978-1-62332-036-2
J9 ECS TRANSACTIONS
PY 2013
VL 45
IS 20
BP 3
EP 14
DI 10.1149/04520.0003ecst
PG 12
WC Electrochemistry; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Electrochemistry; Science & Technology - Other Topics; Materials Science
GA BHH04
UT WOS:000325396600001
ER
PT S
AU Borton, PT
Check, MH
Turner, DB
Dudis, DS
AF Borton, P. T.
Check, M. H.
Turner, D. B.
Dudis, D. S.
BE Guldi, DM
Fenton, JM
Simonian, A
TI Preparation and Characterization of New Fulleride Materials for
Thermoelectric Applications
SO FULLERENES, NANOTUBES, AND CARBON NANOSTRUCTURES - 221ST ECS MEETING
SE ECS Transactions
LA English
DT Proceedings Paper
CT 221st Meeting of the Electrochemical-Society (ECS)
CY MAY 06-10, 2012
CL Seattle, WA
SP Electrochem Soc, Fullerenes, Nanotubes, & Carbon Nanostructures, Energy Technol, Sensor
ID C-60; SCATTERING; FILMS
AB A wide variety of fullerene based materials has shown great promise for energy conversion applications such as thermoelectric and photovoltaic devices. With their intrinsically low thermal conductivities, fullerene based materials may offer several advantages for thermoelectric applications over traditional inorganic based thermoelectric materials. Fulleride materials have already shown electrical properties spanning from the insulative to superconductive regimes. In order to rapidly advance the development of new transition metal fullerides, a thin film approach, novel wet chemical method, and chemical vapor deposition method were explored. Materials formed from these synthesis routes have been found to retain their low thermal conductivities. A present focus is on Raman spectral analysis for preliminary determination of the materials' stoichiometries.
C1 [Borton, P. T.; Check, M. H.; Turner, D. B.; Dudis, D. S.] AF Res Lab, Thermal Sci & Mat Branch, Mat & Mfg Directorate, Wright Patterson Afb, OH 45433 USA.
RP Dudis, DS (reprint author), AF Res Lab, Thermal Sci & Mat Branch, Mat & Mfg Directorate, Wright Patterson Afb, OH 45433 USA.
NR 16
TC 0
Z9 0
U1 2
U2 8
PU ELECTROCHEMICAL SOC INC
PI PENNINGTON
PA 65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA
SN 1938-5862
BN 978-1-60768-388-9; 978-1-62332-036-2
J9 ECS TRANSACTIONS
PY 2013
VL 45
IS 20
BP 15
EP 21
DI 10.1149/04520.0015ecst
PG 7
WC Electrochemistry; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Electrochemistry; Science & Technology - Other Topics; Materials Science
GA BHH04
UT WOS:000325396600002
ER
PT S
AU Grabinski, C
Schlager, J
Hussain, S
AF Grabinski, Christin
Schlager, John
Hussain, Saber
BE Bergese, P
HamadSchifferli, K
TI Hyperspectral Microscopy for Characterization of Gold Nanoparticles in
Biological Media and Cells for Toxicity Assessment
SO NANOMATERIAL INTERFACES IN BIOLOGY: METHODS AND PROTOCOLS
SE Methods in Molecular Biology
LA English
DT Article; Book Chapter
DE Hyperspectral microscopy; Hyperspectral imaging; Light scattering;
Plasmonic nanoparticles; Agglomeration; Cellular interaction
ID SILVER NANOPARTICLES; IN-VITRO; SURFACE-CHEMISTRY; SINGLE GOLD; LIVE
CELLS; SCATTERING; SIZE; MICROSPECTROSCOPY; NANOMATERIALS; SENSITIVITY
AB Nanoparticles (NPs) are being implemented in a wide range of applications, and it is critical to proactively investigate their toxicity. Due to the extensive range of NPs being produced, in vitro studies are a valuable approach for toxicity screening. Key information required to support in vitro toxicity assessments include NP stability in biologically relevant media and fate once exposed to cells. Hyperspectral microscopy is a sensitive, real-time technique that combines the use of microscopy and spectroscopy for the measurement of the reflectance spectrum at individual pixels in a micrograph. This method has been used extensively for molecular imaging with plasmonic NPs as contrast agents (Aaron et al., Opt Express 16: 2153-2167, 2008; Kumar et al., Nano Lett 7: 1338-1343, 2007; Wax and Sokolov, Laser Photon Rev 3: 146-158, 2009; Curry et al., Opt Express 14: 6535-6542, 2006; Curry et al., J Biomed Opt 13: 014022, 2008; Cognet et al., Proc Natl Acad Sci U S A 100: 11350-11355, 2003; Sokolov et al., Cancer Res 63: 19992004, 2003; Snnichsen et al., Nat Biotechnol 23: 741-745, 2005; Nusz et al., Anal Chem 80: 984-989, 2008) and/or sensors (Nusz et al., Anal Chem 80: 984-989, 2008; Ungureanu et al., Sens Actuators B 150: 529-536, 2010; McFarland and Van Duyne, Nano Lett 3: 1057-1062, 2003; Galush et al., Nano Lett 9: 2077-2082, 2009; El-Sayed et al., Nano Lett 5: 829-834, 2005). Here we describe an approach for using hyperspectral microscopy to characterize the agglomeration and stability of plasmonic NPs in biological media and their interactions with cells.
C1 [Grabinski, Christin; Schlager, John; Hussain, Saber] Air Force Res Lab, Wright Patterson Air Force Base, Dayton, OH USA.
RP Grabinski, C (reprint author), Air Force Res Lab, Wright Patterson Air Force Base, Dayton, OH USA.
NR 41
TC 3
Z9 3
U1 0
U2 9
PU HUMANA PRESS INC
PI TOTOWA
PA 999 RIVERVIEW DR, STE 208, TOTOWA, NJ 07512-1165 USA
SN 1064-3745
BN 978-1-62703-462-3; 978-1-62703-461-6
J9 METHODS MOL BIOL
JI Methods Mol. Biol.
PY 2013
VL 1025
BP 167
EP 178
DI 10.1007/978-1-62703-462-3_13
D2 10.1007/978-1-62703-462-3
PG 12
WC Biotechnology & Applied Microbiology; Nanoscience & Nanotechnology
SC Biotechnology & Applied Microbiology; Science & Technology - Other
Topics
GA BHH99
UT WOS:000325474000014
PM 23918337
ER
PT S
AU Allen, MS
Allen, JW
Wenner, BR
Look, DC
Leedy, KD
AF Allen, M. S.
Allen, J. W.
Wenner, B. R.
Look, D. C.
Leedy, K. D.
BE Teherani, FH
Look, DC
Rogers, DJ
TI Application of highly conductive ZnO to plasmonics
SO OXIDE-BASED MATERIALS AND DEVICES IV
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Oxide-Based Materials and Devices IV
CY FEB 03-06, 2013
CL San Francisco, CA
SP SPIE
DE conducting oxide; transparent; plasmon; subwavelength; waveguide
ID OPTICS; AL
AB Plasmonics combines attractive features of nanoelectronics and optics enabling highly integrated, dense subwavelength optical components and electronic circuits which will help alleviate the speed-bottleneck in important technologies such as information processing and computing. The wide application of plasmonic devices hinges on practical demonstrations with low losses at standard optical wavelengths such as near infrared, visible, telecom, etc. Conventional plasmonic devices, based on noble metals, suffer from large losses in these frequency regimes and are difficult to compensate completely by simply adding gain material. Transparent conducting oxides (TCOs) such as ZnO are good alternatives to metals for plasmonic applications in the optical regime since they exhibit high conductivity and relatively small negative real permittivity values necessary for practical plasmonic devices. Ga-doped ZnO layers were grown on Al2O3 at 200 degrees C by pulsed laser deposition in Ar ambient. The electrical properties, determined by the Hall effect, were: rho = 2.95x 10(-4) Omega-cm; mu = 25.3 cm(2)/V-s; and n = 8.36 x 10(20) cm(-3). These values of mu and n were used to predict optical properties through the Drude dielectric function. Reflection measurements confirmed the Hall-effect predictions. The optical and electrical properties of the material were used to design insulator-metal-insulator (in our case, Quartz-ZnO-polymer) waveguides for long range plasmons using full-wave electromagnetic models built with finite element method simulations. The models were used to predict the behavior of ZnO as well as examine the effect of device geometry on propagation length and losses of the plasmon mode.
C1 [Allen, M. S.; Allen, J. W.; Wenner, B. R.; Leedy, K. D.] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Look, D. C.] Wright State Univ, Semicond Res Ctr, Dayton, OH 45435 USA.
[Look, D. C.] Wyle Lab Inc, Dayton, OH 45431 USA.
RP Allen, MS (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM Monica.Allen@wpafb.af.mil
FU Air Force Research Laboratory (AFRL) Sensors Directorate 2012
Entrepreneurial Research Fund Program
FX The authors are thankful for the funding support through the Air Force
Research Laboratory (AFRL) Sensors Directorate 2012 Entrepreneurial
Research Fund Program.
NR 17
TC 2
Z9 2
U1 1
U2 23
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9395-8
J9 PROC SPIE
PY 2013
VL 8626
AR 862605
DI 10.1117/12.2001613
PG 7
WC Materials Science, Multidisciplinary; Optics
SC Materials Science; Optics
GA BHG44
UT WOS:000325342500005
ER
PT J
AU Zhao, Y
Hu, X
Chen, GX
Zhang, XR
Tan, ZQ
Chen, JH
Ruoff, RS
Zhu, YW
Lu, YL
AF Zhao, Yuan
Hu, Xiang
Chen, Guanxiong
Zhang, Xuanru
Tan, Ziqi
Chen, Junhua
Ruoff, Rodney S.
Zhu, Yanwu
Lu, Yalin
TI Infrared biosensors based on graphene plasmonics: modeling
SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS
LA English
DT Article
ID GOLD NANOPARTICLES; WAVE-GUIDES; RESONANCE; SPECTROSCOPY; FILMS; OPTICS;
TRANSISTORS; NANOTUBES; PLATFORM; SENSORS
AB We propose a biosensor by exploiting localized plasmons in graphene and biomolecule adsorption on it. Numerical simulations demonstrate that the sensitivity of such a device can achieve a high value of up to 1697 nm/RIU (refractive index unit) when the wavelength shift at the plasmon resonance is detected. The transparent substrate supporting graphene can be chosen potentially from a wide range of materials including insulators, semiconductors, polymers, and gels. The plasmon resonance wavelength can be tuned with electrostatic doping and/or structure modulation of graphene. Furthermore, the device works in a wide angle range of incident light since the transverse magnetic (TM) polarization is independent of incident angles.
C1 [Zhao, Yuan; Chen, Guanxiong; Tan, Ziqi; Chen, Junhua; Zhu, Yanwu; Lu, Yalin] Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China.
[Zhao, Yuan; Chen, Guanxiong; Tan, Ziqi; Chen, Junhua; Zhu, Yanwu; Lu, Yalin] Univ Sci & Technol China, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China.
[Hu, Xiang; Zhang, Xuanru; Lu, Yalin] Univ Sci & Technol China, Adv Appl Res Ctr, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.
[Ruoff, Rodney S.] Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA.
[Ruoff, Rodney S.] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA.
[Lu, Yalin] US Air Force Acad, Laser Opt Res Ctr, Dept Phys, Colorado Springs, CO 80840 USA.
RP Zhu, YW (reprint author), Univ Sci & Technol China, Dept Mat Sci & Engn, 96 Jin Zhai Rd, Hefei 230026, Peoples R China.
EM zhuyanwu@ustc.edu.cn; yllu@ustc.edu.cn
RI Zhu, Yanwu/C-8979-2012; Ruoff, Rodney/K-3879-2015
FU National Basic Research Program of China [2012CB922001]; China
Government 1000 Plan Talent Program; China MOE NCET Program; USTC
Startup; US Air Force Office of Scientific Research (AFOSR); DTRA [HDTRA
12221]
FX The authors appreciate the financial support from the National Basic
Research Program of China (2012CB922001). Y. Zhu thanks support from
China Government 1000 Plan Talent Program, China MOE NCET Program and
USTC Startup. Y. Lu thanks support from the US Air Force Office of
Scientific Research (AFOSR) and DTRA (HDTRA 12221).
NR 73
TC 16
Z9 17
U1 9
U2 72
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1463-9076
EI 1463-9084
J9 PHYS CHEM CHEM PHYS
JI Phys. Chem. Chem. Phys.
PY 2013
VL 15
IS 40
BP 17118
EP 17125
DI 10.1039/c3cp51952j
PG 8
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 231EX
UT WOS:000325398500013
PM 24005890
ER
PT S
AU Lester, LF
Grillot, F
Naderi, NA
Kovanis, V
AF Lester, L. F.
Grillot, F.
Naderi, N. A.
Kovanis, V.
BE Witzigmann, B
Osinski, M
Henneberger, F
Arakawa, Y
TI Differential Gain Enhancement in a Quantum Dash Laser Using Strong
Optical Injection
SO PHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES XXI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Physics and Simulation of Optoelectronic Devices XXI
CY FEB 04-07, 2013
CL San Francisco, CA
SP SPIE
DE Semiconductor lasers; quantum dots; optical injection; differential
gain; linewidth enhancement factor
ID DOT LASERS; SEMICONDUCTOR-LASERS; MODULATION BANDWIDTH; WELL LASERS;
LINEWIDTH; RELAXATION; PERFORMANCE; THRESHOLD; STATES
AB Increased differential gain is typically realized through strain, quantum confinement, or p-type doping in the active region. These methods have been applied to quantum dots or dashes to raise the differential gain with limited success because the optical gain of these low dimensional systems saturates at modest values. Instead larger differential gain can be accessed at wavelengths blue-shifted from the gain peak and close to optical transparency using the threshold shift induced by optical injection. Using these approaches, greater than 50X improvement in the differential gain has been achieved in an injection-locked QDash FP laser compared to its free-running value.
C1 [Lester, L. F.; Naderi, N. A.] Univ New Mexico, Ctr High Technol Mat, 1313 Goddard SE, Albuquerque, NM 87106 USA.
[Grillot, F.] CNRS LTCL, Ecole Natl Superieure Telecommun, F-75634 Paris, France.
[Kovanis, V.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Lester, LF (reprint author), Univ New Mexico, Ctr High Technol Mat, 1313 Goddard SE, Albuquerque, NM 87106 USA.
EM lflester@unm.edu
RI Grillot, Frederic/N-5613-2014
FU United States Air Force Research Laboratory [FA8750-06-1-0085,
FA9550-10-1-0276]; Air Force Office of Scientific Research (AFOSR)
Laboratory Research Initiation Request (LRIR) [09RY04COR]
FX This work was supported by United States Air Force Research Laboratory
under grant numbers FA8750-06-1-0085 and FA9550-10-1-0276. V. Kovanis
work was supported via the Air Force Office of Scientific Research
(AFOSR) Laboratory Research Initiation Request LRIR 09RY04COR.
NR 27
TC 1
Z9 1
U1 0
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9388-0
J9 PROC SPIE
PY 2013
VL 8619
AR 861907
DI 10.1117/12.2004365
PG 8
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BHH49
UT WOS:000325433900004
ER
PT S
AU Raghunathan, R
Mee, JK
Crowley, MT
Grillot, F
Kovanis, V
Lester, LF
AF Raghunathan, R.
Mee, J. K.
Crowley, M. T.
Grillot, F.
Kovanis, V.
Lester, L. F.
BE Witzigmann, B
Osinski, M
Henneberger, F
Arakawa, Y
TI Modeling and Characterization of Pulse Shape and Pulse Train Dynamics in
Two-Section Passively Mode-Locked Quantum Dot Lasers
SO PHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES XXI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Physics and Simulation of Optoelectronic Devices XXI
CY FEB 04-07, 2013
CL San Francisco, CA
SP SPIE
DE Quantum dot lasers; nonlinear dynamics; delay differential equation
model; passive mode-locking; harmonic mode-locking; pulse
characteristics
ID SEGMENTED CONTACT METHOD; GAIN
AB A nonlinear delay differential equation model for passive mode-locking in semiconductor lasers, seeded with parameters extracted from the gain and loss spectra of a quantum dot laser, is employed to simulate and study the dynamical regimes of mode-locked operation of the device. The model parameter ranges corresponding to these regimes are then mapped to externally-controllable parameters such as gain current and absorber bias voltage. Using this approach, a map indicating the approximate regions corresponding to fundamental and harmonically mode locked operation is constructed as a function of gain current and absorber bias voltage. This is shown to be a highly useful method of getting a sense of the highest repetition rates achievable in principle with a simple, two-section device, and provides a guideline toward achieving higher repetition rates by simply adjusting external biasing conditions instantaneously while the device is in operation, as opposed to re-engineering the device with additional passive or saturable absorber sections. The general approach could potentially aid the development of numerical modeling techniques aimed at providing a systematic guideline geared toward developing microwave and RF photonic sources for THz applications.
C1 [Raghunathan, R.; Mee, J. K.; Lester, L. F.] Univ New Mexico, Ctr High Technol Mat, 1313 Goddard SE, Albuquerque, NM 87106 USA.
[Mee, J. K.] US Air Force, Res Lab, Kirtland AFB, NM 87120 USA.
[Crowley, M. T.] BinOpt Corp, Ithaca, NY 14850 USA.
[Grillot, F.] CNRS LTCI, Ecole Natl Superieure Telecommun, Telecom Paristech, F-75634 Paris, France.
[Kovanis, V.] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Raghunathan, R (reprint author), Univ New Mexico, Ctr High Technol Mat, 1313 Goddard SE, Albuquerque, NM 87106 USA.
EM raghunat@unm.edu
RI Grillot, Frederic/N-5613-2014
FU Air Force Office of Scientific Research [FA9550-10-1-0276,
FA9550-10-1-0463]; National Science Foundation [ECCS-0903448]; Silicon
Research Corporation [SRC-2009-HJ-2000]
FX This work was supported in part by the Air Force Office of Scientific
Research under grants FA9550-10-1-0276 and FA9550-10-1-0463, the
National Science Foundation under grant ECCS-0903448 and by the Silicon
Research Corporation under contract SRC-2009-HJ-2000.
NR 16
TC 1
Z9 1
U1 0
U2 7
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9388-0
J9 PROC SPIE
PY 2013
VL 8619
AR 86190C
DI 10.1117/12.2005434
PG 11
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BHH49
UT WOS:000325433900009
ER
PT S
AU Biswas, S
Duan, JS
Mahalingam, K
Nepal, D
Pachter, R
Drummy, L
Brown, D
Vaia, RA
AF Biswas, Sushmita
Duan, Jinsong
Mahalingam, Krishnamurthy
Nepal, Dhriti
Pachter, Ruth
Drummy, Larry
Brown, Dean
Vaia, Richard A.
BE Stockman, MI
TI Coherent plasmonic engineering in self-assembled reduced symmetry
nanostructures
SO PLASMONICS: METALLIC NANOSTRUCTURES AND THEIR OPTICAL PROPERTIES XI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Plasmonics - Metallic Nanostructures and Their Optical
Properties XI
CY AUG 25-29, 2013
CL San Diego, CA
SP SPIE
DE Fano resonances; dark plasmon modes; gold nanorods; Dolmens;
self-assembly; plasmon induced transparency; metamaterials
ID FANO RESONANCES; GOLD NANORODS; TRANSFORMATION-OPTICS; LIGHT;
NANOPLASMONICS; METAMATERIALS; NANOCAVITIES; MONOLAYERS; DIMERS; MODES
AB Multiple coherent effects including Fano resonances are observed in self-assembled reduced symmetry gold nanorod systems, in particular Dolmen configurations. The bottom-up chemical method provides high quality units and assemblies (single crystal with low surface roughness and sub 5 nm gaps) that reduce radiative losses from the plasmonic structures. Multiple dark and bright plasmonic resonances are observed in optical dark-field scattering measurements and electron energy loss spectroscopy. These high fidelity structures and narrow resonances are promising for future design of high figure of merit sensors, ultrafast switches and slow light devices for optical information processing.
C1 [Biswas, Sushmita; Duan, Jinsong; Mahalingam, Krishnamurthy; Nepal, Dhriti; Pachter, Ruth; Drummy, Larry; Brown, Dean; Vaia, Richard A.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Biswas, S (reprint author), Air Force Res Lab, 2941 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM Sushmita.Biswas.ctr@wpafb.af.mil
NR 33
TC 0
Z9 0
U1 1
U2 6
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9659-1
J9 PROC SPIE
PY 2013
VL 8809
DI 10.1117/12.2024038
PG 6
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BHH43
UT WOS:000325429400026
ER
PT S
AU Cleary, JW
Esfahani, NN
Vangala, S
Guo, JP
Hendrickson, JR
Leedy, KD
Thomson, D
Look, DC
AF Cleary, Justin W.
Esfahani, Nima Nader
Vangala, Shivashankar
Guo, Junpeng
Hendrickson, Joshua R.
Leedy, Kevin D.
Thomson, Darren
Look, David C.
BE Stockman, MI
TI Long-wavelength infrared surface plasmons on Ga-doped ZnO films excited
via 2D hole arrays for extraordinary optical transmission
SO PLASMONICS: METALLIC NANOSTRUCTURES AND THEIR OPTICAL PROPERTIES XI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Plasmonics - Metallic Nanostructures and Their Optical
Properties XI
CY AUG 25-29, 2013
CL San Diego, CA
SP SPIE
DE plasmonics; infrared; EOT; doped zinc oxides
ID RESONANCE BIOSENSORS; SILICON; SILICIDES
AB Extraordinary optical transmission (EOT) through highly conductive ZnO films with sub-wavelength hole arrays is investigated in the long-wavelength infrared regime. EOT is facilitated by the excitation of surface plasmon polaritons (SPPs) and can be tuned utilizing the physical structure size such as period. Pulse laser deposited Ga-doped ZnO has been shown to have fluctuations in optical and electrical parameters based on fabrication techniques, providing a complimentary tuning means. The sub-wavelength 2D hole arrays are fabricated in the Ga-doped ZnO films via standard lithography and etching processes. Optical reflection measurements completed with a microscope coupled FTIR system contain absorption resonances that are in agreement with analytical theories for excitation of SPPs on 2D structures. EOT through Ga-doped ZnO is numerically demonstrated at wavelengths where SPPs are excited. This highly conductive ZnO EOT structure may prove useful in novel integrated components such as tunable biosensors or surface plasmon coupling mechanisms.
C1 [Cleary, Justin W.; Esfahani, Nima Nader; Vangala, Shivashankar; Guo, Junpeng; Hendrickson, Joshua R.; Leedy, Kevin D.; Thomson, Darren; Look, David C.] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Cleary, JW (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM Justin.Cleary@wpafb.af.mil
NR 30
TC 2
Z9 2
U1 0
U2 14
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9659-1
J9 PROC SPIE
PY 2013
VL 8809
AR 88090L
DI 10.1117/12.2022278
PG 8
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BHH43
UT WOS:000325429400004
ER
PT S
AU Pustovit, VN
Urbas, AM
Shahbazyan, TV
AF Pustovit, Vitaliy N.
Urbas, Augustine M.
Shahbazyan, Tigran V.
BE Stockman, MI
TI Cooperative resonance energy transfer in plasmonic systems
SO PLASMONICS: METALLIC NANOSTRUCTURES AND THEIR OPTICAL PROPERTIES XI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Plasmonics - Metallic Nanostructures and Their Optical
Properties XI
CY AUG 25-29, 2013
CL San Diego, CA
SP SPIE
DE energy transfer; FRET; surface plasmon; superradiance
ID SINGLE METAL-PARTICLE; QUANTUM DOTS; DIELECTRIC PARTICLES; TRANSFER
FRET; FLUORESCENCE; SURFACE; MOLECULES; NANOPARTICLES; ENHANCEMENT;
MICROCAVITY
AB We study cooperative effects in energy transfer from an ensemble of donors to an acceptor near a plasmonic nanostructure. We demonstrate that plasmonic coupling between donors changes the energy content of the system and hence dramatically affects transfer of its energy to an outside acceptor. When donors are situated in a close proximity to the metal surface, the transfer is strongly reduced relative to one from independent donors due to additional dissipation caused by plasmon exchange between individual donors. With increasing donors' separation from the metal, dissipation becomes less prevalent and the system transitions to cooperative regime described by plasmonic superradiant and subradiant eigenstates. We find that energy transfer from either one is significantly (similar to 10) more efficient than from independent donors due to much stronger coupling of superradiant states to the acceptor and much weaker damping of subradiant states. We develop a theory for cooperative plasmon-enhanced energy transfer and present numerical results demonstrating the amplification effect for a layer of donors and an acceptor on spherical plasmonic nanoparticle.
C1 [Pustovit, Vitaliy N.; Urbas, Augustine M.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Pustovit, VN (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
NR 49
TC 0
Z9 0
U1 1
U2 9
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9659-1
J9 PROC SPIE
PY 2013
VL 8809
AR 880911
DI 10.1117/12.2024163
PG 9
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BHH43
UT WOS:000325429400010
ER
PT S
AU Lowry, H
Bynum, K
Steely, S
Nicholson, R
Horne, H
AF Lowry, H.
Bynum, K.
Steely, S.
Nicholson, R.
Horne, H.
BE Buford, JA
Murrer, RL
Ballard, GH
TI Development of Tools, Technologies, and Methodologies for Imaging Sensor
Testing
SO TECHNOLOGIES FOR SYNTHETIC ENVIRONMENTS: HARDWARE-IN-THE-LOOP XVIII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Technologies for Synthetic Environments -
Hardware-in-the-Loop XVIII
CY MAY 02, 2013
CL Baltimore, MD
SP SPIE
DE HWIL; cryovacuum testing; imaging sensors; infrared; scene projection;
radiometric sources; mission simulation; scene generation; calibration
AB Ground testing of space- and air-borne imaging sensor systems is supported by Vis-to-LWIR imaging sensor calibration and characterization, as well as hardware-in-the-loop (HWIL) simulation with high-fidelity complex scene projection to validate sensor mission performance. To accomplish this successfully, there must be the development of tools, technologies, and methodologies that are used in space simulation chambers for such testing. This paper provides an overview of such efforts being investigated and implemented at Arnold Engineering Development Complex (AEDC).
C1 [Lowry, H.; Bynum, K.; Steely, S.; Nicholson, R.; Horne, H.] Aerosp Testing Alliance, Arnold AFB, TN USA.
RP Lowry, H (reprint author), Aerosp Testing Alliance, Arnold Engn Dev Complex, Arnold AFB, TN USA.
EM heard.lowry@arnold.af.mil
NR 7
TC 0
Z9 0
U1 1
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9498-6
J9 PROC SPIE
PY 2013
VL 8707
AR 87070B
DI 10.1117/12.2012856
PG 15
WC Optics; Imaging Science & Photographic Technology
SC Optics; Imaging Science & Photographic Technology
GA BHG97
UT WOS:000325393300007
ER
PT S
AU Maize, K
Heller, E
Dorsey, D
Shakouri, A
AF Maize, Kerry
Heller, Eric
Dorsey, Donald
Shakouri, Ali
GP IEEE
TI Fast Transient Thermoreflectance CCD Imaging of Pulsed Self Heating in
AlGaN/GaN Power Transistors
SO 2013 IEEE INTERNATIONAL RELIABILITY PHYSICS SYMPOSIUM (IRPS)
SE International Reliability Physics Symposium
LA English
DT Proceedings Paper
CT IEEE International Reliability Physics Symposium (IRPS)
CY APR 14-18, 2013
CL Anaheim, CA
SP IEEE, Texas Instruments, Cisco Syst, Cadence, Hitachi, IBM, Intel, Mentor Graph, Samsung
AB Pulsed thermoreflectance CCD imaging with submicron spatial resolution and 50 millikelvin temperature resolution is used to study fast transient heating in gallium nitride high electron mobility power transistors (GaN HEMTs) on silicon carbide substrate. Transient surface temperature distribution is measured between 50 ns and 100 mu s for pulsed power to 19 W/mm. Time evolution of surface temperature for different HEMT regions is analyzed. Significant variation is observed between the thermal rise times for the gate metal, GaN channel, and drain metal. Steady state temperature rise of 68 degrees C on the drain contact metal is reached at 100 mu s at 19 W/mm. Observation of time varying thermal gradients in critical HEMT features under fast pulsed operation may help understanding of reliability and failure mechanisms in GaN power transistors.
C1 [Maize, Kerry] Univ Calif Santa Cruz, Dept Elect Engn, Santa Cruz, CA 95064 USA.
[Heller, Eric; Dorsey, Donald] Air Force Res Lab, Mat & Mfg, Wright Patterson AFB, OH 45433 USA.
[Shakouri, Ali] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
RP Maize, K (reprint author), Univ Calif Santa Cruz, Dept Elect Engn, Santa Cruz, CA 95064 USA.
EM kerry@soe.ucsc.edu; shakouri@purdue.edu
FU Air Force Research Laboratory
FX This work was supported in part by a grant from the Air Force Research
Laboratory.
NR 6
TC 0
Z9 0
U1 0
U2 3
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1541-7026
BN 978-1-4799-0113-5; 978-1-4799-0112-8
J9 INT RELIAB PHY SYM
PY 2013
PG 3
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BHD78
UT WOS:000325097500119
ER
PT S
AU Haugan, HJ
Brown, GJ
Kim, M
Mahalingam, K
Elhamri, S
Mitchel, WC
Grazulis, L
AF Haugan, H. J.
Brown, G. J.
Kim, M.
Mahalingam, K.
Elhamri, S.
Mitchel, W. C.
Grazulis, L.
BE Andresen, BF
Fulop, GF
Hanson, CM
Norton, PR
TI Exploring optimum growth window for high quality InAs/InGaSb
superlattice materials
SO INFRARED TECHNOLOGY AND APPLICATIONS XXXIX
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Infrared Technology and Applications XXXIX
CY APR 29-MAY 03, 2013
CL Baltimore, MD
SP SPIE
ID INAS/GASB SUPERLATTICES; PHOTOVOLTAIC DETECTORS; INFRARED DETECTORS;
MU-M; HETEROSTRUCTURES; PHOTODIODES; CUTOFF
AB We report ternary growth studies to develop a largely strained InAs/InGaSb superlattice (SL) material for very long wavelength infrared (VLWIR) detection. We select a SL structure of 47.0 angstrom InAs/21.5 angstrom In0.25Ga0.75Sb that theoretically designed for the greatest possible detectivity, and tune growth conditions for the best possible material quality. Since material quality of grown SLs is largely influenced by extrinsic defects such as nonradiative recombination centers and residual background dopings in the grown layers, we investigate the effect of growth temperature (T-g) on the spectral responses and charge carrier transports using photoconductivity and temperature-dependent Hall effect measurements. Results indicate that molecular beam epitaxy (MBE) growth process we developed produces a consistent gap near 50 meV within a range of few meV, but SL spectral sensing determined by photoresponse (PR) intensity is very sensitive to the minor changes in T-g. For the SLs grown from 390 to 470 degrees C, a PR signal gradually increases as T-g increases from 400 to 440 degrees C by reaching a maximum at 440 degrees C. Outside this growth window, the SL quality deteriorates very rapidly. All SLs grown for this study were n-type, but the mobility varied in a variety of range between 11,300 and 21 cm(2)/Vs. The mobility of the SL grown at 440 degrees C was approximately 10,000 V/cm(2) with a sheet carrier concentration of 5 x 10(11) cm(-2), but the mobility precipitously dropped to 21 cm(2)/Vs at higher temperatures. Using the knowledge we learned from this growth set, other growth parameters for the MBE ternary SL growth should be further adjusted in order to achieve high performance of InAs/InGaSb materials suitable for VLWIR detection.
C1 [Haugan, H. J.; Brown, G. J.; Kim, M.; Mahalingam, K.; Mitchel, W. C.; Grazulis, L.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Haugan, HJ (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 24
TC 1
Z9 1
U1 1
U2 10
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9495-5
J9 PROC SPIE
PY 2013
VL 8704
AR 870413
DI 10.1117/12.2015314
PG 9
WC Optics; Physics, Applied
SC Optics; Physics
GA BHF60
UT WOS:000325262800035
ER
PT S
AU Darafsheh, A
Limberopoulos, NI
Lupu, A
Astratov, VN
AF Darafsheh, Arash
Limberopoulos, Nicholaos I.
Lupu, Anatole
Astratov, Vasily N.
BE Broquin, JE
Conti, GN
TI Filtering of radially polarized beams by microsphere-chain waveguides
SO INTEGRATED OPTICS: DEVICES, MATERIALS, AND TECHNOLOGIES XVII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT 17th Photonics West Conference on Integrated Optics - Devices,
Materials, and Technologies
CY FEB 05-07, 2013
CL San Francisco, CA
SP SPIE
DE Microoptics; microspheres; periodically focused mode; radial
polarization; geometrical optics design
ID TRANSPORT PHENOMENA; PHOTONIC NANOJETS; LIGHT; MODES
AB It is shown that microsphere-chain waveguides have strong polarization-dependent attenuation properties that can be used for developing passive filters of radially polarized beams. By using numerical modeling, it is demonstrated that the principle of operation of such devices is based on filtering periodically focused modes in chains of dielectric spheres occurring for a narrow range of indices of refraction 1.7 crystallographic directions. All six orientations were obtained simultaneously when growing NWs on the (0001) substrate surface, while only one or two NW orientations were observed when growing NWs on any particular crystallographic plane parallel to the c-axis of the substrate. Growth on {101-0} surfaces resulted in only one NW orientation, thereby producing well-aligned NW arrays. Preliminary measurements of the NW electrical conductivity are reported utilizing two-terminal device geometry.
C1 [Koshka, Yaroslav; Thirumalai, Rooban Venkatesh K. G.; Krishnan, Bharat K.] Mississippi State Univ, Emerging Mat Res Lab, Mississippi State, MS 39762 USA.
[Levin, Igor; Davydov, Albert V.] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA.
[Merrett, J. Neil] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Koshka, Y (reprint author), Mississippi State Univ, Emerging Mat Res Lab, Mississippi State, MS 39762 USA.
EM yKoshka@ece.msstate.edu
RI Davydov, Albert/F-7773-2010
OI Davydov, Albert/0000-0003-4512-2311
NR 32
TC 0
Z9 0
U1 0
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9670-6
J9 PROC SPIE
PY 2013
VL 8820
AR 88200M
DI 10.1117/12.2026938
PG 9
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology;
Optics; Physics, Applied
SC Engineering; Science & Technology - Other Topics; Optics; Physics
GA BHH36
UT WOS:000325420200006
ER
PT J
AU Sun, SJ
Ling, YH
Peng, RR
Liu, M
Mao, XY
Chen, XB
Knize, RJ
Lu, YL
AF Sun, Shujie
Ling, Yihan
Peng, Ranran
Liu, Min
Mao, Xiangyu
Chen, Xiaobing
Knize, Randy J.
Lu, Yalin
TI Synthesis of Ni-substituted Bi7Fe3Ti3O21 ceramics and their superior
room temperature multiferroic properties
SO RSC ADVANCES
LA English
DT Article
ID AURIVILLIUS PHASES; WEAK FERROMAGNETISM; CO; FERROELECTRICS;
BI5FETI3O15; BI4TI3O12; CRYSTAL; SYSTEM
AB Layer- structured bismuth complex oxides Bi7Fe3-xNixTi3O21 (0 <= x <= 2) (BFNT) were synthesized using a low- temperature combustion synthesis method. X- ray diffraction patterns and high- resolution transmission electron microscopy analysis indicated that the samples presented a six- layer Aurivillius structure. Substituting Fe sites by Ni ions inside the lattice was found to be effective in enhancing the multiferroic properties at or above the room- temperature. The sample with a composition of x = 1 exhibited a large remnant magnetization (2M(r) = 1.32 emu g(-1)) that is about five hundred times higher than that in unsubstituted Bi7Fe3Ti3O21 ceramics. The work is an important step in the effort to find a single phase and a fully functioning multiferroic material.
C1 [Sun, Shujie; Ling, Yihan; Peng, Ranran; Liu, Min; Lu, Yalin] Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China.
[Lu, Yalin] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.
[Mao, Xiangyu; Chen, Xiaobing] Yangzhou Univ, Coll Phys Sci & Technol, Yangzhou 225009, Peoples R China.
[Knize, Randy J.; Lu, Yalin] US Air Force Acad, Laser Opt Res Ctr, Colorado Springs, CO 80840 USA.
RP Peng, RR (reprint author), Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China.
EM pengrr@ustc.edu.cn; yllu@ustc.edu.cn
RI Peng, Ranran/F-5934-2010; Sun, Shujie/N-1421-2016
OI Sun, Shujie/0000-0001-7079-8378
FU National Basic Research Program of China [2012CB922001]; Natural Science
Foundation of China [51072193]; US Air Force Office of Scientific
Research
FX This work was financially supported by the National Basic Research
Program of China (2012CB922001) and the Natural Science Foundation of
China (51072193). Y. Lu and R. J. Knize also appreciate the support from
the US Air Force Office of Scientific Research.
NR 36
TC 18
Z9 18
U1 4
U2 37
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 2046-2069
J9 RSC ADV
JI RSC Adv.
PY 2013
VL 3
IS 40
BP 18567
EP 18572
DI 10.1039/c3ra42589d
PG 6
WC Chemistry, Multidisciplinary
SC Chemistry
GA 226AM
UT WOS:000325006600048
ER
PT S
AU Allen, JW
Wu, BI
AF Allen, J. W.
Wu, B-I.
BE Sadwick, LP
OSullivan, CM
TI Design and fabrication of an RF GRIN lens using 3D printing technology
SO TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND
APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Terahertz, RF, Millimeter, and Submillimeter-Wave
Technology and Applications VI
CY FEB 05-07, 2013
CL San Francisco, CA
SP SPIE
DE gradient lens; RF; metamaterial; electromagnetic; 3D printing
ID METAMATERIALS
AB Electromagnetic media and metamaterials have been explored in frequency regimes ranging from the acoustic to the visible domain over the past decade. A large part of the design, fabrication and prototyping of such materials has focused on planar structures and devices have been demonstrated primarily for certain propagation directions and/or defined polarization. Here, we present the design of a focusing GRadient INdex (GRIN) lens that operates at RF frequencies and is not polarization constrained. We compare the theoretical and experimental results from this lens designed to operate at X-band and fabricated using 3D printing technology to implement the effective medium. The lens with radially varying refractive index gradient was designed, optimized and analyzed by conducting full-wave simulations finite-element method based software. The permittivity was estimated by effective medium theory and calculated using HFSS (R). The optimized design was used to fabricate the GRIN lens with isotropic, inhomogenous dielectric material. The refractive index was designed to match the theoretical results using mixing ratio of air/voids and a polymer. Further, we used the refractive index profile to predict the rays' trajectories and focus length to compare them to those predicted by the FEM simulations. The field distributions were also analyzed to compare performance of the theoretical design to the fabricated lens and were found to be in good agreement with each other.
C1 [Allen, J. W.; Wu, B-I.] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Allen, JW (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM Allen@wpafb.af.mil
NR 19
TC 1
Z9 1
U1 2
U2 28
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9393-4
J9 PROC SPIE
PY 2013
VL 8624
AR 86240V
DI 10.1117/12.2000708
PG 7
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BHE01
UT WOS:000325112300022
ER
PT S
AU Esfahani, NN
Peale, RE
Buchwald, WR
Hendrickson, JR
Cleary, JW
AF Esfahani, Nima Nader
Peale, Robert E.
Buchwald, Walter R.
Hendrickson, Joshua R.
Cleary, Justin W.
BE Sadwick, LP
OSullivan, CM
TI Millimeter and terahertz detectors based on plasmon excitation in
InGaAs/InP HEMT devices
SO TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND
APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Terahertz, RF, Millimeter, and Submillimeter-Wave
Technology and Applications VI
CY FEB 05-07, 2013
CL San Francisco, CA
SP SPIE
DE HEMT; Plasmon; terahertz; Graphene; 2DEG; detector
ID FIELD-EFFECT TRANSISTORS
AB Recent progress in the investigation of millimeter-wave and THz detectors based on plasmon excitation in the two-dimensional electron gas (2DEG) of a high electron mobility transistor (HEMT) is reported. A tunable resonant polarized photoresponse to mm-wave radiation in the frequency range of 40 to 110 GHz is demonstrated for a grating-gated InGaAs/InP based device. The gate consisted of a metal grating with period of 9 mu m specifically designed for excitation of sub-THz plasmons. The resonant excitation of plasmons, which shifts with gate-bias, changes the channel conductance. This resonant change in channel conductance enables potential applications in chip-scale frequency-agile detectors, which can be scaled to mid-THz frequencies.
C1 [Esfahani, Nima Nader; Peale, Robert E.] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA.
[Esfahani, Nima Nader; Buchwald, Walter R.] Solid State Scientif Corp, Nashua 03060, NEW HAMPSHIRE.
[Buchwald, Walter R.] Univ Massachusetts, Dept Phys, Boston, MA 02125 USA.
[Hendrickson, Joshua R.; Cleary, Justin W.] AF Res Lab, Sensor Directorate, Wright Patterson AFB, OH 45433 USA.
RP Esfahani, NN (reprint author), Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA.
FU Air Force Office of Scientific Research under LRIR [12RY10COR]; Air
Force office of Scientific Research [FA95501010030]
FX NNE and JWC would like to acknowledge support from the Air Force Office
of Scientific Research (Program Manager Dr. Gernot Pomrenke) under LRIR
number 12RY10COR. REP acknowledges support by the Air Force office of
Scientific Research (Program Manager Dr. Gernot Pomrenke) under grant
number FA95501010030. JRH would also like to acknowledge support from
the Air Force Office of Scientific Research (Program Manager Dr. Gernot
Pomrenke) under LRIR number 12RY05COR.
NR 13
TC 1
Z9 1
U1 2
U2 11
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9393-4
J9 PROC SPIE
PY 2013
VL 8624
AR 86240Q
DI 10.1117/12.2006137
PG 8
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BHE01
UT WOS:000325112300019
ER
PT B
AU Carrano, CS
Basu, S
Basu, S
MacKenzie, E
Groves, KM
Pedersen, TR
Holmes, JM
AF Carrano, Charles S.
Basu, Santimay
Basu, Sunanda
MacKenzie, Eileen
Groves, Keith M.
Pedersen, Todd R.
Holmes, Jeffrey M.
GP IEEE
TI Structure of Polar Cap Patches and Fast Shear Flows Following the CME
Impact on 22 January 2012 Inferred from GPS Scintillation Spectra
SO 2013 US NATIONAL COMMITTEE OF URSI NATIONAL RADIO SCIENCE MEETING
(USNC-URSI NRSM)
LA English
DT Proceedings Paper
CT US-National-Committee-of-URSI National Radio Science Meeting
CY JAN 09-12, 2013
CL Boulder, CO
SP URSI, US Natl Comm
C1 [Carrano, Charles S.; Basu, Santimay; Basu, Sunanda; MacKenzie, Eileen; Groves, Keith M.] Boston Coll, Inst Sci Res, Chestnut Hill, MA 02167 USA.
[Pedersen, Todd R.; Holmes, Jeffrey M.] US Air Force, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM USA.
RP Carrano, CS (reprint author), Boston Coll, Inst Sci Res, Chestnut Hill, MA 02167 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-4778-5; 978-1-4673-4776-1
PY 2013
PG 1
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BGZ24
UT WOS:000324678400016
ER
PT J
AU Mudaliar, S
AF Mudaliar, Saba
GP IEEE
TI Wave Propagation in a Random Medium Layer with Rough Boundaries
SO 2013 US NATIONAL COMMITTEE OF URSI NATIONAL RADIO SCIENCE MEETING
(USNC-URSI NRSM)
LA English
DT Proceedings Paper
CT US-National-Committee-of-URSI National Radio Science Meeting
CY JAN 09-12, 2013
CL Boulder, CO
SP URSI, US Natl Comm
C1 Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Mudaliar, S (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM saba.mudaliar@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-4778-5
PY 2013
PG 1
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BGZ24
UT WOS:000324678400155
ER
PT J
AU Huscroft, JR
Hazen, BT
Hall, DJ
Hanna, JB
AF Huscroft, Joseph R.
Hazen, Benjamin T.
Hall, Dianne J.
Hanna, Joe B.
TI Task-technology fit for reverse logistics performance
SO INTERNATIONAL JOURNAL OF LOGISTICS MANAGEMENT
LA English
DT Article
DE Reverse logistics; Information systems; Task-technology fit;
Innovativeness; Information; Innovation
ID SUPPLY CHAIN INTEGRATION; SUSTAINED COMPETITIVE ADVANTAGE;
INFORMATION-SYSTEMS RESEARCH; GROUP SUPPORT-SYSTEMS; ORGANIZATIONAL
PERFORMANCE; STRUCTURATION THEORY; FIRM PERFORMANCE; ACCEPTANCE MODEL;
USER ACCEPTANCE; IMPACT
AB Purpose - Information technology is a key enabler of logistics performance. Unfortunately, most logistics information systems are implemented with forward logistics processes in mind, with little, if any, consideration for the reverse channel. Informed by task-technology fit theory, the authors aim to explore how use of complementary information technologies to support reverse logistics processes can lead to enhanced process performance.
Design/methodology/approach - The authors use a survey method to gather data from logistics professionals who are positioned within various reverse logistics functions. Using reverse logistics processing effectiveness and reverse logistics cost effectiveness as dependent variables, the authors use multiple regression to examine the relationships between indicators of task-technology fit and reverse logistics performance.
Findings - The authors' models explain 49 percent and 30 percent of the variance in reverse logistics cost effectiveness and processing effectiveness, respectively. Information technology use and reverse logistics technology innovativeness are shown to enhance levels of reverse logistics cost effectiveness; information system compatibility and reverse logistics technology innovativeness are shown to enhance levels of reverse logistics processing effectiveness.
Research limitations/implications - Although limited by the sample frame, the authors' findings remain consistent with task-technology fit theory and suggest that employing information technologies that are designed to complement reverse logistics processes can lead to increased reverse logistics process performance.
Practical implications - This study supports the notion that more attention should be given to reverse logistics processes. In order to achieve maximum return on investment, managers should consider allocating resources toward information technologies and systems that directly support reverse logistics.
Originality/value - This research employs a theory that has seen little attention in the logistics literature to provide insight into how use of complementary information technology can enhance reverse logistics processes.
C1 [Huscroft, Joseph R.] United States Air Force, Kadena Air Base, Kadena, Japan.
[Hazen, Benjamin T.; Hall, Dianne J.; Hanna, Joe B.] Auburn Univ, Dept Aviat & Supply Chain Management, Auburn, AL 36849 USA.
RP Hazen, BT (reprint author), Auburn Univ, Dept Aviat & Supply Chain Management, Auburn, AL 36849 USA.
EM benjamin.hazen@auburn.edu
RI Hu, Albert/E-1722-2016;
OI Huscroft, Joseph/0000-0001-9585-011X
NR 87
TC 3
Z9 3
U1 4
U2 43
PU EMERALD GROUP PUBLISHING LTD
PI BINGLEY
PA HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND
SN 0957-4093
EI 1758-6550
J9 INT J LOGIST MANAG
JI Int. J. Logist. Manag.
PY 2013
VL 24
IS 2
BP 230
EP 246
DI 10.1108/IJLM-02-2012-0011
PG 17
WC Management
SC Business & Economics
GA 220ST
UT WOS:000324607900005
ER
PT J
AU Kyle, BG
AF Kyle, Brent G.
TI How Are Thick Terms Evaluative?
SO PHILOSOPHERS IMPRINT
LA English
DT Article
C1 US Air Force Acad, Colorado Springs, CO USA.
RP Kyle, BG (reprint author), US Air Force Acad, Colorado Springs, CO USA.
NR 44
TC 2
Z9 2
U1 0
U2 0
PU UNIV MICHIGAN LIBRARY, MPUBLISHING
PI ANN ARBOR
PA 818 HATCHER GRADUATE LIBRARY SOUTH, 913 S UNIVERSITY AVE, ANN ARBOR, MI
48109-1190 USA
SN 1533-628X
J9 PHILOS IMPRINT
JI Philos. Impr.
PD JAN
PY 2013
VL 13
IS 1
BP 1
EP 20
PG 20
WC Philosophy
SC Philosophy
GA 224EI
UT WOS:000324864900001
ER
PT B
AU Siegel, SG
Fagley, C
Romer, M
McLaughlin, T
AF Siegel, Stefan G.
Fagley, Casey
Roemer, Marcus
McLaughlin, Thomas
GP ASME
TI EXPERIMENTAL INVESTIGATION OF IRREGULAR WAVE CANCELLATION USING A
CYCLOIDAL WAVE ENERGY CONVERTER
SO PROCEEDINGS OF THE ASME 31ST INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE
AND ARTIC ENGINEERING, VOL 7
LA English
DT Proceedings Paper
CT 31st ASME International Conference on Ocean, Offshore and Arctic
Engineering
CY JUL 01-06, 2012
CL Rio de Janeiro, BRAZIL
SP Petrobras, ASME, Ocean Offshore & Arct Engn Div
AB The ability of a Cycloidal Wave Energy Converter (CycWEC) to cancel irregular deep ocean waves is investigated in a 1:300 scale wave tunnel experiment. A CycWEC consists of one or more hydrofoils attached equidistant to a shaft that is aligned parallel to the incoming waves. The entire device is fully submerged in operation. Wave cancellation requires synchronization of the rotation of the CycWEC with the incoming waves, as well as adjustment of the pitch angle of the blades in proportion to the wave height. The performance of a state estimator and controller that achieve this objective were investigated, using the signal from a resistive wave gage located up wave of the CycWEC as input. The CycWEC model used for the present investigations features two blades that are adjustable in pitch in real time. The performance of the CycWEC for both a superposition of two harmonic waves, as well as irregular waves following a Bretschneider spectrum is shown. Wave cancellation e cien-cies as determined by wave measurements of about 80% for the majority of the cases are achieved, with wave periods varying from 0.4s to 0.75s and significant wave heights of H-s approximate to 20mm. This demonstrates that the CycWEC can efficiently interact with irregular waves, which is in good agreement with earlier results obtained from numerical simulations.
C1 [Siegel, Stefan G.; Fagley, Casey; Roemer, Marcus; McLaughlin, Thomas] USAF Acad, Air Force Acad, Dept Aeronaut, Colorado Springs, CO 80840 USA.
RP Siegel, SG (reprint author), USAF Acad, Air Force Acad, Dept Aeronaut, Colorado Springs, CO 80840 USA.
EM stefan@siegels.us
NR 18
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4494-6
PY 2013
BP 309
EP 320
PG 12
WC Energy & Fuels; Engineering, Ocean; Engineering, Mechanical
SC Energy & Fuels; Engineering
GA BGX50
UT WOS:000324507000038
ER
PT J
AU Wie, JJ
Lee, KM
Smith, ML
Vaia, RA
White, TJ
AF Wie, Jeong Jae
Lee, Kyung Min
Smith, Matthew L.
Vaia, Richard A.
White, Timothy J.
TI Torsional mechanical responses in azobenzene functionalized liquid
crystalline polymer networks
SO SOFT MATTER
LA English
DT Article
ID ACTUATORS; LIGHT; PHOTODRIVEN; LOCOMOTION; SELECTION; FILM
AB Soft materials capable of both planar and flexural-torsional responses could enable the development of soft robotic elements that emulate the dexterity and functionality of a multitude of creatures in the animal kingdom. Here, we examine the response of azobenzene-functionalized liquid crystal polymer networks (azo-LCNs) specifically focusing on realizing large magnitude flexural-torsional responses observed as out-of-plane twisting or coiling. Towards this end, azo-LCNs were prepared in either the twisted nematic (TN) or hybrid orientations. The characterization of the flexural-torsional photomechanical responses is complimented with examination of thermomechanical properties. The diverse range of tailorable photomechanical responses is shown to be strongly dependent on the alignment of the nematic director to the film geometry and the actinic light intensity.
C1 [Wie, Jeong Jae; Lee, Kyung Min; Smith, Matthew L.; Vaia, Richard A.; White, Timothy J.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
[Wie, Jeong Jae; Lee, Kyung Min] Azimuth Corp, Dayton, OH 45432 USA.
RP White, TJ (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
EM Timothy.White.24@us.af.mil
RI White, Timothy/D-4392-2012
FU Air Force Office of Scientific Research; Materials and Manufacturing
Directorate of the Air Force Research Laboratory
FX The authors gratefully acknowledge the Materials and Manufacturing
Directorate of the Air Force Research Laboratory and the Air Force
Office of Scientific Research for financial support. M.L.S. contributed
to this work while he held a National Research Council Research
Associateship at the Air Force Research Laboratory.
NR 36
TC 29
Z9 30
U1 2
U2 34
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1744-683X
J9 SOFT MATTER
JI Soft Matter
PY 2013
VL 9
IS 39
BP 9303
EP 9310
DI 10.1039/c3sm51574e
PG 8
WC Chemistry, Physical; Materials Science, Multidisciplinary; Physics,
Multidisciplinary; Polymer Science
SC Chemistry; Materials Science; Physics; Polymer Science
GA 222TT
UT WOS:000324755200006
ER
PT S
AU Goodin, C
Durst, PJ
Prevost, ZT
Compton, PJ
AF Goodin, Christopher
Durst, Phillip J.
Prevost, Zachary T.
Compton, Patrick J.
BE Gilbreath, GC
Hawley, CT
TI A probabilistic model for simulating the effect of airborne dust on
ground-based LIDAR
SO ACTIVE AND PASSIVE SIGNATURES IV
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Active and Passive Signatures IV
CY MAY 01-02, 2013
CL Baltimore, MD
SP SPIE
DE LIDAR; Dust; Optical Depth
AB Field and laboratory measurements of Light Detection and Ranging (LIDAR) sensor interactions with dust have been performed for two types of common ground-based LIDAR sensors. A strong correlation (R-2 > 0.95) between the probability for a return from the dust and the optical depth of the dust was found in the analysis. Based on the experimental correlation, a probabilistic model for LIDAR interactions with dust was developed and verified in field experiments. Finally, the model was integrated into a high-fidelity ray-tracing simulation of LIDAR systems
C1 [Goodin, Christopher; Durst, Phillip J.] US Army Engineer Res & Dev Ctr, 3909 Halls Ferry Rd, Vicksburg, MS 39180 USA.
[Prevost, Zachary T.] Univ Mississippi, Mississippi State, MS USA.
[Compton, Patrick J.] US Air Force Acad, Colorado Springs, CO USA.
RP Goodin, C (reprint author), US Army Engineer Res & Dev Ctr, 3909 Halls Ferry Rd, Vicksburg, MS 39180 USA.
EM christopher.t.goodin@erdc.dren.mil
NR 4
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9525-9
J9 PROC SPIE
PY 2013
VL 8734
AR UNSP 87340D
DI 10.1117/12.2016434
PG 8
WC Optics; Telecommunications
SC Optics; Telecommunications
GA BGK58
UT WOS:000323335100010
ER
PT S
AU Mehmood, A
Clark, J
Sakla, W
AF Mehmood, Asif
Clark, Jeffrey
Sakla, Wesam
BE Gilbreath, GC
Hawley, CT
TI Unmixing Hyperspectral Skin Data using Non-Negative Matrix Factorization
SO ACTIVE AND PASSIVE SIGNATURES IV
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Active and Passive Signatures IV
CY MAY 01-02, 2013
CL Baltimore, MD
SP SPIE
DE Hyperspectral unmixing; non-negative matrix factorization (NMF);
sourcese paration; endmembers; abundance; skin; dismount
ID SEPARATION; ALGORITHM
AB The ability to accurately detect a target of interest in a hyperspectral imagery (HSI) is largely dependent on the spatial and spectral resolution. While hyperspectral imaging provides high spectral resolution, the spatial resolution is mostly dependent on the optics and distance from the target. Many times the target of interest does not occupy a full pixel and thus is concealed within a pixel, i.e. the target signature is mixed with other constituent material signatures within the field of view of that pixel. Extraction of spectral signatures of constituent materials from a mixed pixel can assist in the detection of the target of interest. Hyperspectral unmixing is a process to identify the constituent materials and estimate the corresponding abundances from the mixture. In this paper, a framework based on non-negative matrix factorization (NMF) is presented, which is utilized to extract the spectral signature and fractional abundance of human skin in a scene. The NMF technique is employed in a supervised manner such that the spectral bases of each constituent are computed first, and then these bases are applied to the mixed pixel. Experiments using synthetic and real data demonstrate that the proposed algorithm provides an effective supervised technique for hyperspectral unmixing of skin signatures.
C1 [Mehmood, Asif; Clark, Jeffrey] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Sakla, Wesam] US Air Force, Res Labs, Wright Patterson AFB, OH 45433 USA.
RP Mehmood, A (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM asif.mehmood.ctr@afit.edu
NR 31
TC 0
Z9 0
U1 1
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9525-9
J9 PROC SPIE
PY 2013
VL 8734
AR UNSP 87340O
DI 10.1117/12.2016053
PG 9
WC Optics; Telecommunications
SC Optics; Telecommunications
GA BGK58
UT WOS:000323335100018
ER
PT S
AU Potyrailo, R
Naik, RR
AF Potyrailo, Radislav
Naik, Rajesh R.
BE Clarke, DR
TI Bionanomaterials and Bioinspired Nanostructures for Selective Vapor
Sensing
SO ANNUAL REVIEW OF MATERIALS RESEARCH, VOL 43
SE Annual Review of Materials Research
LA English
DT Review; Book Chapter
DE vapor sensors; bionanomaterials; bioinspired nanostructures;
multivariable individual sensors; wireless sensing; battery-independent
sensor operation; distributed sensor networks; unobtrusive sensors
ID IDENTIFICATION RFID SENSORS; COLLOIDAL PHOTONIC CRYSTALS; BUTTERFLY WING
SCALES; PLASMA POLYMER-FILMS; MOLECULAR RECOGNITION; CARBON NANOTUBES;
CHEMICAL SENSORS; ACOUSTIC-WAVE; BIOELECTRONIC NOSE; STRUCTURAL COLOR
AB At present, monitoring of air at the workplace, in urban environments, and on battlefields; exhaled air from medical patients; air in packaged food containers; and so forth can be accomplished with different types of analytical instruments. Vapor sensors have their niche in these measurements when an unobtrusive, low-power, and cost-sensitive technical solution is required. Unfortunately, existing vapor sensors often degrade their vapor-quantitation accuracy in the presence of high levels of interferences and cannot quantitate several components in complex gas mixtures. Thus, new sensing approaches with improved sensor selectivity are required. This technological task can be accomplished by the careful design of sensing materials with new performance properties and by coupling these materials with the suitable physical transducers. This review is focused on the assessment of the capabilities of bionanomaterials and bioinspired nanostructures for selective vapor sensing. We demonstrate that these sensing materials can operate with diverse transducers based on electrical, mechanical, and optical readout principles and can provide vapor-response selectivity previously unattainable by using other sensing materials. This ability for selective vapor sensing provides opportunities to significantly impact the major directions in development and application scenarios of vapor sensors.
C1 [Potyrailo, Radislav] Gen Elect Global Res Ctr, Niskayuna, NY 12309 USA.
[Naik, Rajesh R.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Potyrailo, R (reprint author), Gen Elect Global Res Ctr, Niskayuna, NY 12309 USA.
EM potyrailo@crd.ge.com
NR 159
TC 12
Z9 12
U1 13
U2 98
PU ANNUAL REVIEWS
PI PALO ALTO
PA 4139 EL CAMINO WAY, PO BOX 10139, PALO ALTO, CA 94303-0897 USA
SN 1531-7331
BN 978-0-8243-1743-0
J9 ANNU REV MATER RES
JI Ann. Rev. Mater. Res.
PY 2013
VL 43
BP 307
EP 334
DI 10.1146/annurev-matsci-071312-121710
PG 28
WC Materials Science, Multidisciplinary
SC Materials Science
GA BGR44
UT WOS:000323892700013
ER
PT S
AU Vehorn, KA
DeSimio, MP
Olson, SE
Brown, KS
Leonard, MS
AF Vehorn, Keith A.
DeSimio, Martin P.
Olson, Steven E.
Brown, Kevin S.
Leonard, Matthew S.
BE Kundu, T
TI Stability of Guided Wave Signals from Bonded Piezoelectric Sensors
SO HEALTH MONITORING OF STRUCTURAL AND BIOLOGICAL SYSTEMS 2013
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Health Monitoring of Structural and Biological Systems
CY MAR 11-14, 2013
CL San Diego, CA
SP SPIE, Amer Soc Mech Engineers
DE structural health monitoring; piezoelectric sensors; actuation cycling;
thermal exposure; correlation coefficient; jitter correction
ID DAMAGE IDENTIFICATION
AB This study investigates the stability of guided wave signals generated and recorded from bonded piezoelectric sensor packages proposed for use in structural health monitoring systems. The study considers the effects of both actuation cycling and thermal exposure on the piezoelectric sensors. The tests are performed using polyimide film encapsulated piezoelectric sensors bonded to aluminum plates and a titanium wing attachment lug, with the testing specifically designed to avoid causing any damage to the host structure. Stability is quantified by computing a correlation coefficient between a reference signal and each test signal. The reference signal is recorded under the initial healthy condition, so any potential changes in the correlation coefficient value are attributed to aging effects. The effects of possible timing differences causing decreases in the correlation coefficient values are reduced by a jitter correction algorithm. The first set of experiments uses four aluminum plates held at constant temperature; four piezoelectric actuators on each plate transmit to a centrally located piezoelectric sensor. To investigate the effect of accumulated actuation cycles on the transducers, different numbers of actuation signals are applied to each set of four actuators. Each test is conducted for 150 blocks, with each of the four actuators producing either 1000, 500, 250, or 100 signals per block. Results from the testing are mixed, with some excitation/sensing paths remaining stable over the duration of all blocks while other paths show substantial changes, including clear trends of decreasing correlation coefficient values. In a second experiment, sensors on a titanium wing attachment lug are exposed to relatively benign levels of thermal exposure. Each test starts with the temperature at a selected baseline value of 120 degrees F. A series of ten elevated temperature exposures are applied with the exposure temperature increasing in 10 degrees F increments to 220 degrees F. The reference and test signals are collected after returning to the baseline temperature. As in the first set of experiments, results from the testing are mixed. Some excitation/sensing paths remain stable over the duration of the test, while others are substantially degraded. For both tests, the exact mechanism causing the instabilities remains unknown. However, the mixed outcomes suggest that the signal changes observed over the course of the collections may be due to flaws within the piezoelectric or electrode material of a specific sensor, or involve the adhesive bond between a particular sensor and the structure.
C1 [Vehorn, Keith A.; DeSimio, Martin P.; Olson, Steven E.] Univ Dayton, Res Inst, 300 Coll Pk Dr, Dayton, OH 45469 USA.
[Brown, Kevin S.; Leonard, Matthew S.] US Air Force, Wright Patterson AFB, OH 45433 USA.
RP Vehorn, KA (reprint author), Univ Dayton, Res Inst, 300 Coll Pk Dr, Dayton, OH 45469 USA.
EM keith.vehorn@udri.udayton.edu
FU U.S. Air Force Research Laboratory [FA8650-11-D-3134]
FX The authors gratefully acknowledge the support of Todd Bussey for his
expertise in LabVIEW programming. The efforts of K. Vehorn, M. DeSimio,
and S. Olson were funded by the U.S. Air Force Research Laboratory under
Contract Number FA8650-11-D-3134.
NR 16
TC 0
Z9 0
U1 2
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9478-8
J9 PROC SPIE
PY 2013
VL 8695
AR UNSP 86952V
DI 10.1117/12.2009733
PG 10
WC Engineering, Biomedical; Engineering, Civil; Optics
SC Engineering; Optics
GA BGI16
UT WOS:000323074200072
ER
PT J
AU Wang, T
Van, KC
Gavitt, BJ
Grayson, JK
Lu, YC
Lyeth, BG
Pichakron, KO
AF Wang, Tao
Van, Ken C.
Gavitt, Brian J.
Grayson, J. Kevin
Lu, Yi-Cheng
Lyeth, Bruce G.
Pichakron, Kullada O.
TI Effect of fish oil supplementation in a rat model of multiple mild
traumatic brain injuries
SO RESTORATIVE NEUROLOGY AND NEUROSCIENCE
LA English
DT Article
DE Mild traumatic brain injury; omega-3 fatty acids; dietary
supplementation; hippocampus; morris water maze
ID POLYUNSATURATED FATTY-ACIDS; FLUID-PERCUSSION MODEL; DIETARY
SUPPLEMENTATION; DOCOSAHEXAENOIC ACID; HEAD TRAUMA; US SOLDIERS;
HIPPOCAMPUS; IMPAIRMENT; CONCUSSION; COGNITION
AB Purpose: Repetitive mild traumatic brain injury (TBI) is a major military and sports health concern. The purpose of this study was to determine if a diet rich in omega-3 fatty acids would reduce cognitive deficits and neuronal cell death in a novel fluid percussion rat model of repetitive mild TBIs.
Methods: Thirty-two Sprague-Dawley rats were assigned to either an experimental rat chow enhanced with 6% fish oil (source of omega-3 fatty acids) or a control rat chow. Both rat chows contained equivalent quantities of calories, oil, and nutrients. After four weeks, both groups received mild repetitive bilateral fluid percussion TBIs on two sequential days. Pre-injury diets were resumed, and the animals were monitored for two weeks. On post-injury days 10-14, Morris Water Maze testing was performed to assess spatial learning and cognitive function. Animals were euthanized at 14 days post-injury to obtain specimens for neurohistopathology.
Results: There was no difference in pre-injury weight gain between groups. Post-injury, animals on the fish oil diet lost less weight and recovered their weight significantly faster. By 14 days, the fish oil diet group performed significantly better in the Morris Water Maze. Neurohistopathology identified a non-significant trend toward a higher density of hippocampal neurons in the fish oil diet group.
Conclusions: Pre-injury dietary supplementation with fish oil improves recovery of body weight and provides a small improvement in cognitive performance in a rat model of multiple mild TBIs.
C1 [Wang, Tao] 306th Hosp PLA, Dept Neurosurg, Beijing, Peoples R China.
[Wang, Tao; Van, Ken C.; Lyeth, Bruce G.] Univ Calif Davis, Dept Neurol Surg, Davis, CA 95616 USA.
[Gavitt, Brian J.; Pichakron, Kullada O.] David Grant Med Ctr, Dept Surg, Travis AFB, CA USA.
[Gavitt, Brian J.; Pichakron, Kullada O.] Univ Calif Davis, Dept Surg, Sacramento, CA 95817 USA.
[Gavitt, Brian J.; Grayson, J. Kevin; Pichakron, Kullada O.] David Grant Med Ctr, Clin Invest Facil, Travis AFB, CA USA.
[Lu, Yi-Cheng] Second Mil Med Univ, Changzheng Hosp, Dept Neurosurg, Shanghai, Peoples R China.
RP Pichakron, KO (reprint author), USAF, MC, Dept Surg, David Grant USAF Med Ctr,Lieutenant Colonel, 60 MSGS SGCQ,101 Bodin Circle, Travis Air Force Base, CA 94535 USA.
EM kullada.pichakron@us.af.mil
FU Henry M. Jackson Foundation [050611]
FX This research was supported by a grant from the Henry M. Jackson
Foundation (050611).
NR 42
TC 8
Z9 8
U1 7
U2 11
PU IOS PRESS
PI AMSTERDAM
PA NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS
SN 0922-6028
J9 RESTOR NEUROL NEUROS
JI Restor. Neurol. Neurosci.
PY 2013
VL 31
IS 5
BP 647
EP 659
DI 10.3233/RNN-130316
PG 13
WC Neurosciences
SC Neurosciences & Neurology
GA 216DQ
UT WOS:000324262100010
PM 23835930
ER
PT S
AU Asmolova, O
Andersen, G
Dearborn, ME
McHarg, MG
Quiller, T
Murphey, T
AF Asmolova, Olha
Andersen, Geoff
Dearborn, Michael E.
McHarg, Matthew G.
Quiller, Trey
Murphey, Thomas
BE Pham, KD
Cox, JL
Howard, RT
Chen, G
TI Optical analysis of a membrane photon sieve space telescope
SO SENSORS AND SYSTEMS FOR SPACE APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Sensors and Systems for Space Applications VI
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE Space telescopes; lightweight optics; diffractive optics
AB This paper focuses on recent progress in designing FallconSAT-7, a 3U CubeSat solar telescope designed to image the Sun from low Earth orbit. The telescope system includes a deployable structure that supports a membrane photon sieve under tension as well as secondary optics. To satisfy mission requirements to demonstrate diffraction limited imaging capability of this collapsible, f/2 diffractive primary we have completed studying a number off effects on membrane material that can affect system imaging quality.
C1 [Asmolova, Olha; Andersen, Geoff; Dearborn, Michael E.; McHarg, Matthew G.; Quiller, Trey] USAF Acad, HQ USAFA DFP, 2354 Fairchild Dr,Ste 2A31, Colorado Springs, CO 80840 USA.
[Murphey, Thomas] RVSV, Air Force Res Lab, Kirtland AFB, NM 87117 USA.
RP Asmolova, O (reprint author), USAF Acad, HQ USAFA DFP, 2354 Fairchild Dr,Ste 2A31, Colorado Springs, CO 80840 USA.
FU Air Force Office of Scientific Research (AFOSR)
FX We wish to acknowledge support for this project from the Air Force
Office of Scientific Research (AFOSR). The construction of this
satellite is a collaborative effort that includes participation from HUA
Inc., MMA Design Inc., NASA, AFIT and AFRL.
NR 9
TC 0
Z9 1
U1 0
U2 9
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9530-3
J9 PROC SPIE
PY 2013
VL 8739
AR UNSP 87390C
DI 10.1117/12.2015416
PG 7
WC Engineering, Aerospace; Remote Sensing; Optics
SC Engineering; Remote Sensing; Optics
GA BGN20
UT WOS:000323553200011
ER
PT S
AU Gao, JJ
Blasch, E
Pham, K
Chen, GS
Shen, D
Wang, ZH
AF Gao, Jianjun
Blasch, Erik
Pham, Khanh
Chen, Genshe
Shen, Dan
Wang, Zhonghai
BE Pham, KD
Cox, JL
Howard, RT
Chen, G
TI Automatic Vehicle License Plate Recognition with Color Component Texture
Detection and Template Matching
SO SENSORS AND SYSTEMS FOR SPACE APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Sensors and Systems for Space Applications VI
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE Automatic Vehicle License Plate Recognition; Color Component Texture;
Template Matching
AB Automatic vehicle license plate recognition (LPR) is important for intelligent traffic surveillance systems. This paper suggests a vehicle license plate algorithm, color component texture detection and template matching (CCTD-TM). CCTD-TM has advantages of ease of implementation and highly efficient in calculation. We suggest a novel algorithm of color component texture for license plate localization. This algorithm takes advantage of the feature of fixed color texture of plate base and character. The image preprocessing and character recognition by template matching parts are included in the LPR algorithm. The preliminary results demonstrate an average detection rate over 96.5% and an average recognition rate over 89.9% on hundreds of vehicle images tested in the experiments.
C1 [Gao, Jianjun; Chen, Genshe; Shen, Dan; Wang, Zhonghai] Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
[Blasch, Erik] Air Force Res Lab, Griffiss AFB, NY 13441 USA.
[Pham, Khanh] Air Force Res Lab, Kirtland AFB, NM 87117 USA.
RP Gao, JJ (reprint author), Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
NR 23
TC 1
Z9 1
U1 0
U2 7
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9530-3
J9 PROC SPIE
PY 2013
VL 8739
AR UNSP 87390Z
DI 10.1117/12.2014595
PG 6
WC Engineering, Aerospace; Remote Sensing; Optics
SC Engineering; Remote Sensing; Optics
GA BGN20
UT WOS:000323553200031
ER
PT S
AU Bine, J
Xin, M
Pham, K
Blasch, E
Chen, GS
AF Jia, Bin
Xin, Ming
Pham, Khanh
Blasch, Erik
Chen, Genshe
BE Pham, KD
Cox, JL
Howard, RT
Chen, G
TI Multiple Sensor Estimation Using a High-Degree Cubature Information
Filter
SO SENSORS AND SYSTEMS FOR SPACE APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Sensors and Systems for Space Applications VI
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE Information Filter; Cubature Rule; Target Tracking; Bayesian Estimation
ID MULTISENSOR DATA FUSION; KALMAN-FILTER; TARGET TRACKING; FUZZY-LOGIC;
ARCHITECTURE; ALGORITHMS
AB In this paper, a high-degree cubature information filter (CIF) is proposed for multiple sensor estimation. Astatistical linear error propagation method incorporates the high-degree cubature integration rule into the extended information filtering (EIF) framework such that more accurate estimation can be achieved than the extended information filter as well as the unscented information filter (UIF). In addition, the high-degree CIF maintains close performance to the Gauss-Hermite Quadrature information filter (GHQIF) but uses significantly fewer quadrature points. As a result, the curse of dimensionality problem existing in the tensor product based GHQIF can be greatly alleviated. Besides the improved estimation accuracy and computational efficiency, the high-degree CIF also exhibits the desirable robustness under unknown noise statistics. The proposed CIF is compared with other information filters (e.g., EIF, UIF, GHQIF) via a target tracking problem and demonstrates the best performance.
C1 [Jia, Bin; Chen, Genshe] Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
[Xin, Ming] Mississippi State Univ, Dept Aerosp Engn, Mississippi State, MS 39762 USA.
[Pham, Khanh] Air Force Res Lab, Kirtland AFB, NM 87117 USA.
[Blasch, Erik] Air Force Res Lab, Griffiss AFB, NY 13441 USA.
RP Chen, GS (reprint author), Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
EM gchen@intfusiontech.com
FU US National Science Foundation CAREER [ECCS-0846877]
FX This work was supported by the US National Science Foundation CAREER
Award (grant number ECCS-0846877)
NR 31
TC 0
Z9 0
U1 0
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9530-3
J9 PROC SPIE
PY 2013
VL 8739
AR UNSP 87390T
DI 10.1117/12.2015546
PG 13
WC Engineering, Aerospace; Remote Sensing; Optics
SC Engineering; Remote Sensing; Optics
GA BGN20
UT WOS:000323553200026
ER
PT S
AU Sease, B
Koglin, R
Flewelling, B
AF Sease, Brad
Koglin, Ryan
Flewelling, Brien
BE Pham, KD
Cox, JL
Howard, RT
Chen, G
TI Long Integration Star Tracker Image Processing for Combined Attitude -
Attitude Rate Estimation
SO SENSORS AND SYSTEMS FOR SPACE APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Sensors and Systems for Space Applications VI
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE Attitude Determination; Image Processing; Star Trackers
AB A method is proposed for extracting attitude data from streaked star images using traditional image processing methods. The process enables collection of both attitude and angular velocity estimates from streaking star images, where traditional star identification methods would produce poor results. Star streak endpoints are localized as "corner-like" portions of a streak. A vector cross-product based method is developed to produce a proper grouping in time for endpoints. Star identification and single point attitude determination methods can be applied to each set of endpoints, retrieving two sets of data from a single image. Monte Carlo results are presented, and the implications of the results are discussed. Multiple corner detection methods are considered and compared. Future work needed to mature the process is discussed. Results indicate an endpoint detection accuracy of less than a tenth of a pixel for a camera angle to the rotation axis of greater than 20 degrees and streak lengths up to 40% of the field of view.
C1 [Sease, Brad] Univ Cent Florida, 4000 Cent Florida Blvd, Orlando, FL 32816 USA.
[Koglin, Ryan] Univ Akron, Akron, OH 44325 USA.
[Flewelling, Brien] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
RP Sease, B (reprint author), Univ Cent Florida, 4000 Cent Florida Blvd, Orlando, FL 32816 USA.
NR 15
TC 1
Z9 1
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9530-3
J9 PROC SPIE
PY 2013
VL 8739
AR UNSP 87390Y
DI 10.1117/12.2020004
PG 12
WC Engineering, Aerospace; Remote Sensing; Optics
SC Engineering; Remote Sensing; Optics
GA BGN20
UT WOS:000323553200030
ER
PT S
AU Tian, X
Tian, Z
Pham, K
Blasch, E
Chen, GS
AF Tian, Xin
Tian, Zhi
Khanh Pham
Blasch, Erik
Chen, Genshe
BE Pham, KD
Cox, JL
Howard, RT
Chen, G
TI QoS-aware Dynamic Spectrum Access for Cognitive Radio Networks
SO SENSORS AND SYSTEMS FOR SPACE APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Sensors and Systems for Space Applications VI
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE Cognitive Radio; Dynamic Spectrum Access; Quality of Service (QoS);
communications
ID WIRELESS NETWORKS
AB Ubiquitous wireless networking requires efficient dynamic spectrum access (DSA) among heterogeneous users with diverse transmission types and bandwidth demands. To meet user-specific quality-of-service (QoS) requirements, the power and spectrum allocated to each user should lie inside a power/spectral-shape bounded region in order to be meaningful for the intended application. Most existing DSA methods aim at enhancing the total system utility. As such, spectrum wastage may arise when the system-wide optimal allocation falls outside individual users' desired regions for QoS provisioning. In this work, novel QoS-aware DSA algorithms are developed for both non-cooperative power allocation (QoSNCPA) and cooperative (QoSCPA) users in cognitive radio (CR) networks. The algorithms maximize the "useful utilities" to the users, and minimize the power consumption and mutual interference within the CR network. Simulations results of the QoSNCPA and QoSCPA for single and multiple channel cases demonstrate the effectiveness of the algorithms for DSA.
C1 [Tian, Xin; Chen, Genshe] Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
[Tian, Zhi] Michigan Tech Univ, Dept Elect & Comp Engn, Houghton, MI 49931 USA.
[Khanh Pham] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
[Blasch, Erik] US Air Force, Res Lab, Griffiss AFB, NY 13441 USA.
RP Tian, X (reprint author), Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
FU Air Force Research Laboratory - Space Vehicles [FA9453-12-M-0022]
FX This research was supported in part by the Air Force Research Laboratory
- Space Vehicles Directorate under contract number FA9453-12-M-0022. The
views and conclusions contained herein are those of the authors and
should not be interpreted as necessarily representing the official
policies or endorsements, either expressed or implied, of the Air Force.
NR 22
TC 1
Z9 1
U1 0
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9530-3
J9 PROC SPIE
PY 2013
VL 8739
AR UNSP 87390P
DI 10.1117/12.2015205
PG 12
WC Engineering, Aerospace; Remote Sensing; Optics
SC Engineering; Remote Sensing; Optics
GA BGN20
UT WOS:000323553200022
ER
PT S
AU Tian, X
Pham, K
Blasch, E
Tian, Z
Shen, D
Chen, GS
AF Tian, Xin
Khanh Pham
Blasch, Erik
Tian, Zhi
Shen, Dan
Chen, Genshe
BE Pham, KD
Cox, JL
Howard, RT
Chen, G
TI An Efficient QoS-aware Routing Algorithm for LEO Polar Constellations
SO SENSORS AND SYSTEMS FOR SPACE APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Sensors and Systems for Space Applications VI
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
ID GENERATION SATELLITE NETWORKS; PERFORMANCE
AB In this work, a Quality of Service (QoS)-aware routing (QAR) algorithm is developed for Low-Earth Orbit (LEO) polar constellations. LEO polar orbits are the only type of satellite constellations where inter-plane inter-satellite links (ISLs) are implemented in real world. The QAR algorithm exploits features of the topology of the LEO satellite constellation, which makes it more efficient than general shortest path routing algorithms such as Dijkstra's or extended Bellman-Ford algorithms. Traffic density, priority, and error QoS requirements on communication delays can be easily incorporated into the QAR algorithm through satellite distances. The QAR algorithm also supports efficient load balancing in the satellite network by utilizing the multiple paths from the source satellite to the destination satellite, and effectively lowers the rate of network congestion. The QAR algorithm supports a novel robust routing scheme in LEO polar constellation, which is able to significantly reduce the impact of inter-satellite link (ISL) congestions on QoS in terms of communication delay and jitter.
C1 [Tian, Xin; Shen, Dan; Chen, Genshe] Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
[Khanh Pham] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
[Blasch, Erik] US Air Force, Res Lab, Griffiss AFB, NY 13441 USA.
[Tian, Zhi] Michigan Tech Univ, Dept Elect & Comp Engn, Houghton, MI 49931 USA.
RP Tian, X (reprint author), Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
FU Air Force Research Laboratory - Space Vehicles Directorate
[FA9453-12-M-0022]
FX This research was supported in part by the Air Force Research Laboratory
- Space Vehicles Directorate under contract number FA9453-12-M-0022. The
views and conclusions contained herein are those of the authors and
should not be interpreted as necessarily representing the official
policies or endorsements, either expressed or implied, of the Air Force.
NR 15
TC 0
Z9 0
U1 0
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9530-3
J9 PROC SPIE
PY 2013
VL 8739
AR UNSP 87390O
DI 10.1117/12.2015203
PG 10
WC Engineering, Aerospace; Remote Sensing; Optics
SC Engineering; Remote Sensing; Optics
GA BGN20
UT WOS:000323553200021
ER
PT S
AU Yu, W
Wei, SX
Shen, D
Blowers, M
Blasch, EP
Pham, KD
Chen, GS
Zhang, HL
Lu, C
AF Yu, Wei
Wei, Sixiao
Shen, Dan
Blowers, Misty
Blasch, Erik P.
Pham, Khanh D.
Chen, Genshe
Zhang, Hanlin
Lu, Chao
BE Pham, KD
Cox, JL
Howard, RT
Chen, G
TI On Detection and Visualization Techniques for Cyber Security Situation
Awareness
SO SENSORS AND SYSTEMS FOR SPACE APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Sensors and Systems for Space Applications VI
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
ID INTRUSION DETECTION
AB Networking technologies are exponentially increasing to meet worldwide communication requirements. The rapid growth of network technologies and perversity of communications pose serious security issues. In this paper, we aim to developing an integrated network defense system with situation awareness capabilities to present the useful information for human analysts. In particular, we implement a prototypical system that includes both the distributed passive and active network sensors and traffic visualization features, such as 1D, 2D and 3D based network traffic displays. To effectively detect attacks, we also implement algorithms to transform real-world data of IP addresses into images and study the pattern of attacks and use both the discrete wavelet transform (DWT) based scheme and the statistical based scheme to detect attacks. Through an extensive simulation study, our data validate the effectiveness of our implemented defense system.
C1 [Yu, Wei; Wei, Sixiao; Zhang, Hanlin; Lu, Chao] Towson Univ, Comp & Informat Sci Dept, Towson, MD 21252 USA.
[Shen, Dan; Chen, Genshe] Intelligent Fus TechnolInc, Germantown, MD 20876 USA.
[Blowers, Misty; Blasch, Erik P.] US Air Force, Res Lab, Griffiss AFB, NY 13441 USA.
[Pham, Khanh D.] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
RP Yu, W (reprint author), Towson Univ, Comp & Informat Sci Dept, Towson, MD 21252 USA.
EM wyu@towson.edu; gchen@intfusiontech.com
OI Zhang, Hanlin/0000-0001-8869-6863
NR 29
TC 0
Z9 0
U1 1
U2 11
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9530-3
J9 PROC SPIE
PY 2013
VL 8739
AR UNSP 87390R
DI 10.1117/12.2015887
PG 9
WC Engineering, Aerospace; Remote Sensing; Optics
SC Engineering; Remote Sensing; Optics
GA BGN20
UT WOS:000323553200024
ER
PT S
AU Yu, W
Wei, SX
Xu, GB
Chen, GS
Pham, K
Blasch, EP
Lu, C
AF Yu, Wei
Wei, Sixiao
Xu, Guobin
Chen, Genshe
Khanh Pham
Blasch, Erik P.
Lu, Chao
BE Pham, KD
Cox, JL
Howard, RT
Chen, G
TI On Effectiveness of Routing Algorithms for Satellite Communication
Networks
SO SENSORS AND SYSTEMS FOR SPACE APPLICATIONS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Sensors and Systems for Space Applications VI
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE Satellite Communication Networks; Weighted-based Route Selection;
Bandwidth Utilization; End-to-end Delay
AB For worldwide, a satellite communication network is an integral component of the global networking infrastructure. In this paper, we focus on developing effective routing techniques that consider both user preferences and network dynamic conditions. In particular, we develop a weighted-based route selection scheme for the core satellite communication network. Unlike the shortest path routing scheme, our scheme chooses the route from multiple matched entries based on the assigned weights that reflect the dynamic condition of networks. We also discuss how to derive the optimal weights for route assignment. To further meet user's preference, we implement the multiple path routing scheme to achieve the high rate of data transmission and the preemption based routing scheme to guarantee the data transmission for high priority users. Through extensive simulation studies, our data validates the effectiveness of our proposed routing schemes.
C1 [Yu, Wei; Wei, Sixiao; Xu, Guobin; Lu, Chao] Towson Univ, Comp & Informat Sci Dept, Towson, MD 21252 USA.
[Chen, Genshe] Intelligent Fus Technol Inc, Kirtland AFB, NM 20876 USA.
[Khanh Pham] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
[Blasch, Erik P.] US Air Force, Res Lab, Griffiss AFB, NY 13441 USA.
RP Yu, W (reprint author), Towson Univ, Comp & Informat Sci Dept, Towson, MD 21252 USA.
EM wyu@towson.edu; gchen@intfusiontech.com
NR 21
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9530-3
J9 PROC SPIE
PY 2013
VL 8739
AR UNSP 87390Q
DI 10.1117/12.2015536
PG 8
WC Engineering, Aerospace; Remote Sensing; Optics
SC Engineering; Remote Sensing; Optics
GA BGN20
UT WOS:000323553200023
ER
PT S
AU Blasch, E
Salerno, J
Kadar, I
Yang, SJ
Fenstermacher, L
Endsley, M
Grewe, L
AF Blasch, Erik
Salerno, John
Kadar, Ivan
Yang, Shanchieh Jay
Fenstermacher, Laurie
Endsley, Mica
Grewe, Lynne
BE Kadar, I
TI Summary of Human Social, Cultural, Behavioral (HSCB) Modeling for
Information Fusion Panel Discussion
SO SIGNAL PROCESSING, SENSOR FUSION, AND TARGET RECOGNITION XXII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Signal Processing, Sensor Fusion, and Target Recognition
XXII
CY APR 29-MAY 02, 2013
CL Baltimore, MD
SP SPIE
DE Human; Social; Cultural; Behavioral Modeling; Situation Awareness;
Information Fusion; Sense-making
ID DECISION; PATTERNS
AB During the SPIE 2012 conference, panelists convened to discuss "Real world issues and challenges in Human Social/Cultural/Behavioral modeling with Applications to Information Fusion." Each panelist presented their current trends and issues. The panel had agreement on advanced situation modeling, working with users for situation awareness and sense-making, and HSCB context modeling in focusing research activities. Each panelist added different perspectives based on the domain of interest such as physical, cyber, and social attacks from which estimates and projections can be forecasted. Also, additional techniques were addressed such as interest graphs, network modeling, and variable length Markov Models. This paper summarizes the panelists discussions to highlight the common themes and the related contrasting approaches to the domains in which HSCB applies to information fusion applications.
C1 [Blasch, Erik; Salerno, John] Air Force Res Lab, Informat Directorate, Rome, NY 13441 USA.
[Kadar, Ivan] Interlink Syst Sci, Lake Success, NY 11042 USA.
[Yang, Shanchieh Jay] Rochester Inst Technol, Rochester, NY 14623 USA.
[Fenstermacher, Laurie] US Air Force, Res Lab, Human Effectiveness Directorate, Wright Patterson AFB, OH 45433 USA.
[Endsley, Mica] SA Technologies, Marietta, GA 30066 USA.
[Grewe, Lynne] Calif State Univ Hayward, Hayward, CA 90802 USA.
RP Blasch, E (reprint author), Air Force Res Lab, Informat Directorate, Rome, NY 13441 USA.
NR 89
TC 0
Z9 0
U1 0
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9536-5
J9 PROC SPIE
PY 2013
VL 8745
AR UNSP 87451I
DI 10.1117/12.2016305
PG 18
WC Engineering, Electrical & Electronic; Optics; Telecommunications
SC Engineering; Optics; Telecommunications
GA BGN53
UT WOS:000323570300057
ER
PT S
AU Cheng, ZQ
Mosher, S
Cheng, HN
Webb, T
AF Cheng, Zhiqing
Mosher, Stephen
Cheng, Huaining
Webb, Timothy
BE Kadar, I
TI Human Activity Recognition Based on Human Shape Dynamics
SO SIGNAL PROCESSING, SENSOR FUSION, AND TARGET RECOGNITION XXII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Signal Processing, Sensor Fusion, and Target Recognition
XXII
CY APR 29-MAY 02, 2013
CL Baltimore, MD
SP SPIE
DE Dynamic Shape; Shape Descriptor; Principal Component Analysis; Activity
Recognition; Data Mining; Classification
AB Human activity recognition based on human shape dynamics was investigated in this paper. The shape dynamics describe the spatial-temporal shape deformation of a human body during its movement and thus provide important information about the identity of a human subject and the motions performed by the subject. The dynamic shapes of four subjects in five activities (digging, jogging, limping, throwing, and walking) were created via 3-D motion replication. The Paquet Shape Descriptor (PSD) was used to describe subject shapes in each frame. The principal component analysis was performed on the calculated PSDs and principal components (PCs) were used to characterize PSDs. The PSD calculation was then reasonably approximated by its significant projections in the eigen-space formed by PCs and represented by the corresponding projection coefficients. As such, the dynamic human shapes for each activity were described by these projection coefficients, which in turn, along with their derivatives were used to form the feature vectors (attribute sets) for activity classification. Data mining technology was employed with six classification methods used. Seven attribute sets were evaluated with high classification accuracy attained for most of them. The results from this investigation illustrate the great potential of human shape dynamics for activity recognition.
C1 [Cheng, Zhiqing; Mosher, Stephen] Infoscitex Corp, 4027 Colonel Glenn Highway, Dayton, OH 45431 USA.
[Cheng, Huaining; Webb, Timothy] US Air Force, Res Lab, Dayton, OH 45433 USA.
RP Cheng, ZQ (reprint author), Infoscitex Corp, 4027 Colonel Glenn Highway, Dayton, OH 45431 USA.
EM zhiqing.cheng.ctr@wpafb.af.mil
NR 14
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9536-5
J9 PROC SPIE
PY 2013
VL 8745
AR UNSP 874517
DI 10.1117/12.2015487
PG 10
WC Engineering, Electrical & Electronic; Optics; Telecommunications
SC Engineering; Optics; Telecommunications
GA BGN53
UT WOS:000323570300047
ER
PT S
AU Gao, JJ
Ling, HB
Blasch, E
Pham, K
Wang, ZH
Chen, GS
AF Gao, Jianjun
Ling, Haibin
Blasch, Erik
Khanh Pham
Wang, Zhonghai
Chen, Genshe
BE Kadar, I
TI Pattern of Life from WAMI Objects Tracking based on Context-Aware
Tracking and Information Network Models
SO SIGNAL PROCESSING, SENSOR FUSION, AND TARGET RECOGNITION XXII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Signal Processing, Sensor Fusion, and Target Recognition
XXII
CY APR 29-MAY 02, 2013
CL Baltimore, MD
SP SPIE
DE Pattern of life; WAMI; multi-target tracking; entity networks; pattern
extraction
AB With the emergence of long lasting surveillance systems, e. g., full motion video (FMV) networks and wide area motion imagery (WAMI) sensors, extracting targets' long term pattern of life over a day becomes possible. In this paper, we present a framework for extracting the pattern of life (POL) of targets from WAMI video. We first apply a context-aware multi-target tracker (CAMT) to track multiple targets in the WAMI video and obtain the targets' tracklets, traces, and the locations, from surveillance information extracted from the targets' long-term trajectories. Then, entity networks propagate over time are constructed with targets' tracklets, traces, and the interested locations. Finally, the entity network is analyzed using network retrieving technique to extract the POL of interested targets.
C1 [Gao, Jianjun; Wang, Zhonghai; Chen, Genshe] Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
[Ling, Haibin] Temple Univ, Philadelphia, PA 19122 USA.
[Blasch, Erik] US Air Force, Res Lab, Rome, NY 13441 USA.
[Khanh Pham] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
RP Gao, JJ (reprint author), Intelligent Fus Technol Inc, Germantown, MD 20876 USA.
NR 23
TC 1
Z9 1
U1 0
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9536-5
J9 PROC SPIE
PY 2013
VL 8745
AR UNSP 87451K
DI 10.1117/12.2015612
PG 9
WC Engineering, Electrical & Electronic; Optics; Telecommunications
SC Engineering; Optics; Telecommunications
GA BGN53
UT WOS:000323570300058
ER
PT S
AU LaRue, JP
Luzanov, Y
AF LaRue, James P.
Luzanov, Yuriy
BE Kadar, I
TI Stabilizing Bidirectional Associative Memory with Principles in
Independent Component Analysis and Nullspace (PICANS)
SO SIGNAL PROCESSING, SENSOR FUSION, AND TARGET RECOGNITION XXII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Signal Processing, Sensor Fusion, and Target Recognition
XXII
CY APR 29-MAY 02, 2013
CL Baltimore, MD
SP SPIE
ID NEURAL NETWORKS; RECOGNITION
AB A new extension to the way in which the Bidirectional Associative Memory (BAM) algorithms are implemented is presented here. We will show that by utilizing the singular value decomposition (SVD) and integrating principles of independent component analysis (ICA) into the nullspace (NS) we have created a novel approach to mitigating spurious attractors. We demonstrate this with two applications. The first application utilizes a one-layer association while the second application is modeled after the several hierarchal associations of ventral pathways. The first application will detail the way in which we manage the associations in terms of matrices. The second application will take what we have learned from the first example and apply it to a cascade of a convolutional neural network (CNN) and perceptron this being our signal processing model of the ventral pathways, i.e., visual systems.
C1 [LaRue, James P.] JADCO Signals, Hanahan, SC USA.
[Luzanov, Yuriy] US Air Force, Wright Patterson AFB, OH USA.
RP LaRue, JP (reprint author), JADCO Signals, Hanahan, SC USA.
EM jadcosignals@earthlink.net; Yuriy.luzanov@rl.af.mil
NR 8
TC 0
Z9 0
U1 0
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9536-5
J9 PROC SPIE
PY 2013
VL 8745
AR UNSP 87451Z
DI 10.1117/12.2017742
PG 19
WC Engineering, Electrical & Electronic; Optics; Telecommunications
SC Engineering; Optics; Telecommunications
GA BGN53
UT WOS:000323570300069
ER
PT S
AU Pinkus, AR
Dommett, DW
Task, HL
AF Pinkus, Alan R.
Dommett, David W.
Task, H. Lee
BE Kadar, I
TI A comparison of sensor resolution assessment by human vision versus
custom software for Landolt C and triangle resolution targets
SO SIGNAL PROCESSING, SENSOR FUSION, AND TARGET RECOGNITION XXII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Signal Processing, Sensor Fusion, and Target Recognition
XXII
CY APR 29-MAY 02, 2013
CL Baltimore, MD
SP SPIE
DE multi-spectral sensor resolution; image fusion; Landolt C; Triangle
Orientation Detection
AB This paper is the fifth in a series exploring the possibility of using a synthetic observer to assess the resolution of both real and synthetic (fused) sensors. The previous paper introduced an Automatic Triangle Orientation Detection Algorithm (ATODA) that was capable of recognizing the orientation of an equilateral triangle used as a resolution target, which complemented the Automatic Landolt C Orientation Recognition (ALCOR) software developed earlier. Three different spectral band sensors (infrared, near infrared and visible) were used to collect images that included both resolution targets and militarily relevant targets at multiple distances. The resolution targets were evaluated using the two software algorithms described above. For the current study, subjects viewed the same set of images previously used in order to obtain human-based assessments of the resolutions of these three sensors for comparison with the automated approaches. In addition, the same set of images contained hand-held target objects so that human performance in recognizing the targets could be compared to both the automated and human-based assessment of resolution for each sensor.
C1 [Pinkus, Alan R.; Dommett, David W.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Pinkus, AR (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
EM alan.pinkus@wpafb.af.mil
NR 9
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9536-5
J9 PROC SPIE
PY 2013
VL 8745
AR UNSP 87450Z
DI 10.1117/12.2017643
PG 12
WC Engineering, Electrical & Electronic; Optics; Telecommunications
SC Engineering; Optics; Telecommunications
GA BGN53
UT WOS:000323570300040
ER
PT S
AU Dajani, I
Vergien, C
Ward, B
Robin, C
Naderi, S
Flores, A
Diels, JC
AF Dajani, Iyad
Vergien, Christopher
Ward, Benjamin
Robin, Craig
Naderi, Shadi
Flores, Angel
Diels, Jean-Claude
BE Vodopyanov, KL
TI Experimental and theoretical investigations of single-frequency Raman
fiber amplifiers operating at 1178 nm
SO NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS, DEVICES, AND
APPLICATIONS XII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nonlinear Frequency Generation and Conversion - Materials,
Devices, and Applications XII
CY FEB 05-07, 2013
CL San Francisco, CA
SP SPIE
DE Raman fiber amplifier; stimulated Brillouin scattering; stimulated Raman
scattering
ID STIMULATED-BRILLOUIN-SCATTERING; LASER GUIDE STAR
AB We present a detailed study of power scaling in polarization-maintaining Raman fiber amplifiers operating at 1178 nm since this wavelength can be frequency doubled into 589 nm for sodium guide star applications. We confirm experimentally that the optimized output signal at SBS threshold scales linearly with the pump power. We also present results from numerical and experimental studies investigating the scalability of Raman fiber amplifiers with seed power. Both co-pumped and counter pumped two-stage amplifiers utilizing acoustically tailored fiber for SBS suppression were constructed and studied. For the former configuration spectral broadening was observed, while the latter configuration provided 22 W of single-frequency output. Finally, we show results of a phase-modulated amplifier generating multiple spectral lines separated by 886 MHz, which corresponds to the spectral separation of the sodium D2a, and D-2b lines after frequency doubling in a nonlinear cavity.
C1 [Dajani, Iyad; Vergien, Christopher; Robin, Craig; Naderi, Shadi; Flores, Angel] Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
[Ward, Benjamin] US Air Force Acad, Dept Phys, Colorado Springs, CO 80840 USA.
[Diels, Jean-Claude] Univ New Mexico, Dept Phys, Albuquerque, NM 87131 USA.
RP Dajani, I (reprint author), Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
NR 12
TC 1
Z9 1
U1 1
U2 6
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9373-6
J9 PROC SPIE
PY 2013
VL 8604
AR UNSP 86040N
DI 10.1117/12.2006946
PG 7
WC Optics; Physics, Applied
SC Optics; Physics
GA BGE28
UT WOS:000322536300017
ER
PT S
AU Tassev, V
Snure, M
Peterson, R
Schepler, KL
Bedford, R
Mann, M
Vangala, S
Goodhue, W
Lin, A
Harris, J
Fejer, M
Schunemann, P
AF Tassev, V.
Snure, M.
Peterson, R.
Schepler, K. L.
Bedford, R.
Mann, M.
Vangala, S.
Goodhue, W.
Lin, A.
Harris, J.
Fejer, M.
Schunemann, Peter
BE Vodopyanov, KL
TI Progress in orientation-patterned GaP for next-generation nonlinear
optical devices
SO NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS, DEVICES, AND
APPLICATIONS XII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nonlinear Frequency Generation and Conversion - Materials,
Devices, and Applications XII
CY FEB 05-07, 2013
CL San Francisco, CA
SP SPIE
DE hydride vapor phase epitaxy; nonlinear optical materials; quasi-phase
matching; orientation patterned templates; frequency conversion devices;
laser sources in the mid IR and THz region
ID GROWTH MORPHOLOGIES; GAAS; ABSORPTION; THICK; HVPE; TEMPLATES; FILMS
AB Orientation-patterned GaP is a promising nonlinear material for frequency conversion in the mid and longwave IR (2-5 mu m and 8-12 mu m) by quasi-phase matching. As an alternative to OPGaAs, OPGaP has the advantage of having lower two-photon absorption in the convenient pumping range 1 - 1.7 mu m. We report recent results on development of thick QPM GaP for high power tunable laser sources radiating in the mid IR. Two are the major challenges to producing OPGaP: development of simple techniques for preparation of patterned templates and a technology for fast epitaxial growth of thick, high quality GaP on these templates. The focus was to adapt/simplify the wafer fusion process for OPGaP template preparation. Then increase the growth rate and layer thickness of regrown material, while maintaining vertical domain propagation. The growth experiments were conducted in a horizontal quartz reactor, using a standard hydride vapor phase epitaxial process. The growth was performed on: (i) plain (100) GaP; (ii) half-patterned (HP) and (iii) orientation-patterned (OP) templates, fabricated on (100) GaP. Up to 370 mu m thick layers with high crystal and optical quality were reproducibly grown on plain material. Growth on HP templates resulted in up to 470 mu m thick layers with rectangular mesa's shape. These results were used to determine the optimal substrate and pattern orientations. HVPE growth on OP templates achieved stable growth rates of 50-70 mu m/h with domain walls propagating vertically, following the periodicity of the initial pattern, and resulted in the first 350 mu m thick device quality OPGaP.
C1 [Tassev, V.; Snure, M.; Peterson, R.; Schepler, K. L.; Bedford, R.; Mann, M.] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Vangala, S.] Solid State Sci Corp, Hollins, NH 03049 USA.
[Lin, A.; Harris, J.; Fejer, M.] Stanford Univ, Stanford, CA 94305 USA.
[Goodhue, W.] Univ Massachusetts, Photon Ctr, Lowell, MA 01854 USA.
[Schunemann, Peter] BAE Syst Inc, Nashua, NH 03061 USA.
RP Tassev, V (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM vladimir.tassev@wpafb.af.mil
OI Schepler, Kenneth/0000-0001-9658-2305
FU Air Force Office for Scientific Research [10RY06COR, FA8650-09-C-1653,
0052-4916HE04-20110615]
FX This research was supported by the Air Force Office for Scientific
Research under contracts 10RY06COR, FA8650-09-C-1653 and
0052-4916HE04-20110615.
NR 27
TC 3
Z9 3
U1 0
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9373-6
J9 PROC SPIE
PY 2013
VL 8604
AR UNSP 86040V
DI 10.1117/12.2008057
PG 9
WC Optics; Physics, Applied
SC Optics; Physics
GA BGE28
UT WOS:000322536300022
ER
PT S
AU Chalise, BK
Zhang, YMD
Amin, MG
Himed, B
AF Chalise, Batu K.
Zhang, Yimin D.
Amin, Moeness G.
Himed, Braham
BE Dianat, SA
Zoltowski, MD
TI Target Position Localization in a Passive Radar System Through Convex
Optimization
SO WIRELESS SENSING, LOCALIZATION, AND PROCESSING VIII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Wireless Sensing, Localization, and Processing VIII
CY MAY 01-02, 2013
CL Baltimore, MD
SP SPIE
ID SEMIDEFINITE RELAXATION
AB This paper proposes efficient target localization methods for a passive radar system using bistatic time-of-arrival (TOA) information measured at multiple synthetic array locations, where the position of these synthetic array locations is subject to random errors. Since maximum likelihood (ML) formulation of this target localization problem is a non-convex optimization problem, semi-definite relaxation (SDR)-based optimization methods in general do not provide satisfactory performance. As a result, approximated ML optimization problems are proposed and solved with SDR plus bisection methods. For the case without position errors, it is shown that the relaxation guarantees a rank-one solution. The optimization problem for the case with position errors involves only a relaxation of a scalar quadratic term. Simulation results show that the proposed algorithms outperform existing methods and provide mean square position error performance very close to the Cramer-Rao lower bound even for larger values of noise and position estimation errors.
C1 [Chalise, Batu K.; Zhang, Yimin D.; Amin, Moeness G.] Villanova Univ, Ctr Adv Commun, Villanova, PA 19085 USA.
[Himed, Braham] US Air Force, Res Lab, RYMD, Wright Patterson AFB, OH 45433 USA.
RP Chalise, BK (reprint author), Villanova Univ, Ctr Adv Commun, Villanova, PA 19085 USA.
EM batu.chalise@villanova.edu
NR 19
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9544-0
J9 PROC SPIE
PY 2013
VL 8753
AR UNSP 87530I
DI 10.1117/12.2018148
PG 10
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BGM98
UT WOS:000323541400014
ER
PT S
AU Sundaram, R
Martin, R
Anderson, C
AF Sundaram, Ramakrishnan
Martin, Richard
Anderson, Christopher
BE Dianat, SA
Zoltowski, MD
TI Regularization in Radio Tomographic Imaging
SO WIRELESS SENSING, LOCALIZATION, AND PROCESSING VIII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Wireless Sensing, Localization, and Processing VIII
CY MAY 01-02, 2013
CL Baltimore, MD
SP SPIE
DE Linear least-squares model; scalar and vector regularization
ID ARCHITECTURES; RESTORATION
AB This paper demonstrates methods to select and apply regularization to the linear least-squares model formulation of the radio tomographic imaging (RTI) problem. Typically, the RTI inverse problem of image reconstruction is ill-conditioned due to the extremely small singular values of the weight matrix which relates the link signal strengths to the voxel locations of the obstruction. Regularization is included to offset the non-invertible nature of the weight matrix by adding a regularization term such as the matrix approximation of derivatives in each dimension based on the difference operator. This operation yields a smooth least-squares solution for the measured data by suppressing the high energy or noise terms in the derivative of the image. Traditionally, a scalar weighting factor of the regularization matrix is identified by trial and error (adhoc) to yield the best fit of the solution to the data without either excessive smoothing or ringing oscillations at the boundaries of the obstruction. This paper proposes new scalar and vector regularization methods that are automatically computed based on the weight matrix. Evidence of the effectiveness of these methods compared to the preset scalar regularization method is presented for stationary and moving obstructions in an RTI wireless sensor network. The variation of the mean square reconstruction error as a function of the scalar regularization is calculated for known obstructions in the network. The vector regularization procedure based on selective updates to the singular values of the weight matrix attains the lowest mean square error.
C1 [Sundaram, Ramakrishnan] Gannon Univ, Erie, PA 16541 USA.
[Martin, Richard] US Air Force, Inst Technol, Dayton, OH 45433 USA.
[Anderson, Christopher] US Naval Acad, Annapolis, MD 21402 USA.
RP Sundaram, R (reprint author), Gannon Univ, Erie, PA 16541 USA.
NR 7
TC 1
Z9 1
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9544-0
J9 PROC SPIE
PY 2013
VL 8753
AR UNSP 87530O
DI 10.1117/12.2012167
PG 9
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BGM98
UT WOS:000323541400020
ER
PT S
AU Graham, J
Ternovskiy, IV
AF Graham, James
Ternovskiy, Igor V.
BE Ternovskiy, IV
Chin, P
TI Complex scenes and situations visualization in hierarchical learning
algorithm with dynamic 3D NeoAxis engine
SO CYBER SENSING 2013
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Cyber Sensing
CY APR 30-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE unsupervised learning; hierarchical learning; visualization; Dynamic
Logic
AB We applied a two stage unsupervised hierarchical learning system to model complex dynamic surveillance and cyber space monitoring systems using a non-commercial version of the NeoAxis visualization software. The hierarchical scene learning and recognition approach is based on hierarchical expectation maximization, and was linked to a 3D graphics engine for validation of learning and classification results and understanding the human - autonomous system relationship. Scene recognition is performed by taking synthetically generated data and feeding it to a dynamic logic algorithm. The algorithm performs hierarchical recognition of the scene by first examining the features of the objects to determine which objects are present, and then determines the scene based on the objects present. This paper presents a framework within which low level data linked to higher-level visualization can provide support to a human operator and be evaluated in a detailed and systematic way.
C1 [Graham, James; Ternovskiy, Igor V.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Graham, J (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 16
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9548-8
J9 PROC SPIE
PY 2013
VL 8757
AR UNSP 87570J
DI 10.1117/12.2018833
PG 10
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BGN55
UT WOS:000323571700013
ER
PT S
AU Graham, J
O'Connor, A
Ternovskiy, IV
Ilin, R
AF Graham, James
O'Connor, Alan
Ternovskiy, Igor V.
Ilin, Roman
BE Ternovskiy, IV
Chin, P
TI The two stage hierarchical unsupervised learning system for complex
dynamic scene recognition
SO CYBER SENSING 2013
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Cyber Sensing
CY APR 30-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE hierarchical learning; dynamic logic; neural modeling fields;
unsupervised learning
AB The two stage hierarchical unsupervised learning system has been proposed for modeling complex dynamic surveillance and cyberspace systems. Using a modification of the expectation maximization learning approach, we introduced a three layer approach to learning concepts from input data: features, objects, and situations. Using the Bernoulli model, this approach models each situation as a collection of objects, and each object as a collection of features. Further complexity is added with the addition of clutter features and clutter objects. During the learning process, at the lowest level, only binary feature information (presence or absence) is provided. The system attempts to simultaneously determine the probabilities of the situation and presence of corresponding objects from the detected features. The proposed approach demonstrated robust performance after a short training period. This paper discusses this hierarchical learning system in a broader context of different feedback mechanisms between layers and highlights challenges on the road to practical applications.
C1 [Graham, James; O'Connor, Alan; Ternovskiy, Igor V.; Ilin, Roman] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Graham, J (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 7
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9548-8
J9 PROC SPIE
PY 2013
VL 8757
AR UNSP 87570E
DI 10.1117/12.2018754
PG 11
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BGN55
UT WOS:000323571700009
ER
PT S
AU Lee, MG
AF Lee, Michael G.
BE Self, D
TI Geospatial Intelligence (GEOINT) and Intelligence Surveillance and
Reconnaissance (ISR) Convergence
SO MOTION IMAGERY TECHNOLOGIES, BEST PRACTICES, AND WORKFLOWS FOR
INTELLIGENCE, SURVEILLANCE, AND RECONNAISSANCE (ISR), AND SITUATIONAL
AWARENESS
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Motion Imagery Technologies, Best Practices, and Workflows
for Intelligence, Surveillance, and Reconnaissance (ISR), and
Situational Awareness
CY APR 30, 2013
CL Baltimore, MD
SP SPIE
DE GEOINT; geospatial; intelligence; surveillance; reconnaissance; ISR; FMV
AB An examination of the potentialities, benefits and challenges of the confluence, integration and operation of Geospatial Intelligence (GEOINT) capabilities, products and techniques within the larger context of the Intelligence, Surveillance and Reconnaissance (ISR) arena, particularly in regards to persistent surveillance and Full Motion Video (FMV)
C1 USAF, Reston, VA 20190 USA.
RP Lee, MG (reprint author), USAF, 11091 Sunset Hills Rd,Suite 777, Reston, VA 20190 USA.
NR 0
TC 0
Z9 0
U1 1
U2 6
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9531-0
J9 PROC SPIE
PY 2013
VL 8740
AR UNSP 874003
DI 10.1117/12.2019032
PG 8
WC Optics; Imaging Science & Photographic Technology
SC Optics; Imaging Science & Photographic Technology
GA BGL43
UT WOS:000323412900002
ER
PT S
AU Kirk, JC
Lin, K
Gray, A
Hseih, C
Darden, S
Kwong, W
Majumder, U
Scarborough, S
AF Kirk, John C., Jr.
Lin, Kai
Gray, Andrew
Hseih, Chung
Darden, Scott
Kwong, Winston
Majumder, Uttam
Scarborough, Steven
BE Ranney, KI
Doerry, A
TI Lightweight SAR GMTI Radar Technology Development
SO RADAR SENSOR TECHNOLOGY XVII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Radar Sensor Technology XVII
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
AB A small and lightweight dual-channel radar has been developed for SAR data collections. Using standard Displaced Phase Center Antenna (DPCA) radar digital signal processing, SAR GMTI images have been obtained. The prototype radar weighs 5-lbs and has demonstrated the extraction of ground moving targets (GMTs) embedded in high-resolution SAR imagery data. Heretofore this type of capability has been reserved for much larger systems such as the JSTARS. Previously, small lightweight SARs featured only a single channel and only displayed SAR imagery. Now, with the advent of this new capability, SAR GMTI performance is now possible for small UAV class radars.
C1 [Kirk, John C., Jr.; Lin, Kai; Gray, Andrew; Hseih, Chung; Darden, Scott; Kwong, Winston] Goleta Star LLC, Torrance, CA 90501 USA.
[Majumder, Uttam; Scarborough, Steven] WPAFB, RYAP, AFRL, Wright Patterson AFB, OH USA.
RP Kirk, JC (reprint author), Goleta Star LLC, Torrance, CA 90501 USA.
NR 23
TC 0
Z9 0
U1 1
U2 7
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9505-1
J9 PROC SPIE
PY 2013
VL 8714
AR UNSP 87140T
DI 10.1117/12.2015085
PG 10
WC Optics; Telecommunications
SC Optics; Telecommunications
GA BGN39
UT WOS:000323559400025
ER
PT S
AU Shin, HJ
Narayanan, RM
Rangaswamy, M
AF Shin, Hee Jung
Narayanan, Ram M.
Rangaswamy, Muralidhar
BE Ranney, KI
Doerry, A
TI Tomographic imaging with ultra-wideband noise radar using time-domain
data
SO RADAR SENSOR TECHNOLOGY XVII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Radar Sensor Technology XVII
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE Tomographic imaging; back projection imaging; ultra-wideband; noise
radar system
AB This paper investigates the feasibility of using a noise waveform in an ultra-wideband (UWB) radar system for two-dimensional tomographic imaging of a stationary object with a multistatic tomographic geometry. Multiple UWB transmitters and receivers are positioned along each side of the imaging area. We perform several numerical simulations in time-domain, and the successful imaging of the target is achieved by visual inspection of the formed images.
C1 [Shin, Hee Jung; Narayanan, Ram M.] Penn State Univ, University Pk, PA 16802 USA.
[Rangaswamy, Muralidhar] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Shin, HJ (reprint author), Penn State Univ, University Pk, PA 16802 USA.
FU Air Force Office of Scientific Research (AFOSR) [FA9550-12-1-0164]
FX This work was supported by the Air Force Office of Scientific Research
(AFOSR) Contract # FA9550-12-1-0164. We appreciate useful comments
received from Dr. Tristan Nguyen of AFOSR.
NR 8
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9505-1
J9 PROC SPIE
PY 2013
VL 8714
AR UNSP 87140R
DI 10.1117/12.2016898
PG 9
WC Optics; Telecommunications
SC Optics; Telecommunications
GA BGN39
UT WOS:000323559400023
ER
PT S
AU Vela, R
Bracken, LJE
AF Vela, Russell
Bracken, L. Justing E.
BE Ranney, KI
Doerry, A
TI Radar Tomography Assisted Three-Dimensional Localization via the Noisy
Stepped Frequency Waveform
SO RADAR SENSOR TECHNOLOGY XVII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Radar Sensor Technology XVII
CY APR 29-MAY 01, 2013
CL Baltimore, MD
SP SPIE
DE Radar; Noise Band Radar; Signal Processing; NSF; Noisy LSF; Tomography;
Waveform Diversity; Three Dimensional Localization
ID MOVING TARGETS TMT
AB Radar tomography has been an active area of investigation at the Air Force Research Laboratory (AFRL) for many years. Building upon this knowledge base, recent efforts have begun to focus on developing synergistic combinations between noise based waveforms and radar tomographic imaging techniques.(1) More specifically, an emphasis has been placed on extending the traditional dimensionality from two to three, while condensing the familiar overall required instantaneous bandwidth for noise based radar systems. Through the inclusion of a Direction of Arrival (DOA) capability into the radar RF architecture, and through back projection processing, a target is capable of being located both in its azimuthal and elevation position between multiple towers. The previously developed Noisy Stepped Frequency (NSF) waveform is utilized as the excitation source from each radar towers thereby reducing the necessary instantaneous bandwidth.(2) The thumb-tack-like response of the NSF waveform provides a "sharpened" image of the target and better assists in the localization of the target in its appropriate elevation. The DOA is implemented through the Generalized Cross Correlation (GCC) method. Through the processing combination of back projection and DOA, imaging and localization of both single, and multiple targets is realizable for a three dimensional geometry. Simulated and experimental validations shall be provided and compared.
C1 [Vela, Russell; Bracken, L. Justing E.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Vela, R (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Russell.Vela@ieee.org
NR 15
TC 0
Z9 0
U1 0
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9505-1
J9 PROC SPIE
PY 2013
VL 8714
AR UNSP 87140G
DI 10.1117/12.2020599
PG 14
WC Optics; Telecommunications
SC Optics; Telecommunications
GA BGN39
UT WOS:000323559400012
ER
PT S
AU Sotirelis, P
Parker, J
Hu, XY
Cheney, M
Ferrara, M
AF Sotirelis, Paul
Parker, Jason
Hu, Xueya
Cheney, Margaret
Ferrara, Matthew
BE Zelnio, E
Garber, FD
TI Frequency-dependent reflectivity image reconstruction
SO ALGORITHMS FOR SYNTHETIC APERTURE RADAR IMAGERY XX
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Algorithms for Synthetic Aperture Radar Imagery XX
CY MAY 01-02, 2013
CL Baltimore, MD
SP SPIE
DE synthetic aperture radar; frequency-dependent imaging
AB We evaluate a recently reported algorithm for computing frequency-dependent radar imagery in scenarios relevant for performing spectral feature identification. For each image pixel in the spatial domain a computed frequency-dependent reflectivity is used to produce a corresponding spectral feature identification. We show that this novel image reconstruction technique is capable of considerable flexibility for achieving fine spectral resolution in comparison with previous techniques based on conventional synthetic aperture radar (SAR), yet new challenges are introduced with regard to achieving fine range resolution.
C1 [Sotirelis, Paul; Parker, Jason; Hu, Xueya] AF Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Sotirelis, P (reprint author), AF Res Lab, Sensors Directorate, 2241 Avion Circle, Wright Patterson AFB, OH 45433 USA.
NR 4
TC 1
Z9 1
U1 1
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9537-2
J9 PROC SPIE
PY 2013
VL 8746
AR UNSP 874602
DI 10.1117/12.2020647
PG 8
WC Optics; Telecommunications
SC Optics; Telecommunications
GA BGK66
UT WOS:000323341800001
ER
PT J
AU Basnight, Z
Butts, J
Lopez, J
Dube, T
AF Basnight, Zachry
Butts, Jonathan
Lopez, Juan
Dube, Thomas
BE Hart, D
TI Analysis of Programmable Logic Controller Firmware for Threat Assessment
and Forensic Investigation
SO PROCEEDINGS OF THE 8TH INTERNATIONAL CONFERENCE ON INFORMATION WARFARE
AND SECURITY (ICIW-2013)
LA English
DT Proceedings Paper
CT 8th International Conference on Information Warfare and Security (ICIW)
CY MAR 25-26, 2013
CL Regis Univ, Denver, CO
HO Regis Univ
DE industrial control system; programmable logic controller; firmware;
embedded device; forensics; threat assessment
AB Modern industrial control systems (ICSs) regulate operations over a variety of different applications. Of most interest to national security is the role ICSs play in the management of critical infrastructure (CI) such as the national power grid, water treatment, and chemical industry. The control systems used in such sectors are developing into highly networked collections of distributed devices. Unfortunately, security has only recently become a topic of major concern for these devices. This leaves many implementations without secure configurations due to their long lifespan compared to the rate of advancing threats. In the paradigm of ICSs, programmable logic controllers (PLCs) represent the front line between the cyber world and physical systems. Attacks like Stuxnet have already proven the effectiveness of cyber-physical attacks by altering and disguising PLC programming, but the next generation of threats will likely focus on PLC firmware. Just as traditional computer malware evolved to hide itself using operating system-level rootkits, so will ICS attacks evolve to embed themselves in the PLC equivalent: the firmware. Since little research has been done in the area of PLC firmware security, this paper begins by addressing the related security concerns. One such concern is the application of digital forensics to a potential incident of ICS attack. Forensic investigations of digital devices have traditionally been limited to the analysis of typical computer systems like desktops or laptops. As forensic capabilities begin to expand into the scope of embedded devices like smartphones, parallels can be drawn to PLCs that will enable the development of more advanced forensic tools and processes. By performing a firmware analysis through reverse engineering, a PLC can be exploited for both malicious and forensic purposes. This paper discusses the techniques and procedures required to access, inspect, and manipulate firmware for an Allen-Bradley PLC to suit the purposes of the examiner. From this analysis, lessons can be learned not only about the capabilities and methods required by a potential attacker, but also about the accessibility and effectiveness of recovering PLC firmware for forensic investigation of a potential attack.
C1 [Basnight, Zachry; Butts, Jonathan; Lopez, Juan; Dube, Thomas] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Basnight, Z (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM zachry.basnight@afit.edu; jonathan.butts@afit.edu; juan.lopez@afit.edu;
thomas.dube@afit.edu
RI Emchi, Karma/Q-1952-2016
NR 22
TC 1
Z9 1
U1 1
U2 5
PU ACAD CONFERENCES LTD
PI NR READING
PA CURTIS FARM, KIDMORE END, NR READING, RG4 9AY, ENGLAND
BN 978-1-909507-11-1
PY 2013
BP 9
EP 15
PG 7
WC Computer Science, Information Systems; Computer Science, Theory &
Methods
SC Computer Science
GA BFY83
UT WOS:000321919600002
ER
PT S
AU Wang, JS
Steenbergen, EH
Smith, HE
Grazulis, L
Massengale, JA
Ullrich, B
Brown, GJ
AF Wang, Joanna S.
Steenbergen, Elizabeth H.
Smith, Howard E.
Grazulis, Lawrence
Massengale, Jeremy A.
Ullrich, Bruno
Brown, Gail J.
BE Eyink, KG
Huffaker, DL
Szmulowicz, F
TI Stability Studies of Lead Sulfide Colloidal Quantum Dot Films on Glass
and GaAs Substrates
SO QUANTUM DOTS AND NANOSTRUCTURES: SYNTHESIS, CHARACTERIZATION, AND
MODELING X
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Quantum Dots and Nanostructures - Synthesis,
Characterization, and Modeling X
CY FEB 04-06, 2013
CL San Francisco, CA
SP SPIE
DE Pbs quantum dots; photoluminescence; deposition; supercritical CO2;
UV-Vis-NIR spectrophotometry; X-ray photoelectron spectroscopy; X-ray
diffraction; atomic force microscopy
ID BINARY NANOPARTICLE SUPERLATTICES; ORDERED ARRAYS; NANOCRYSTAL SOLIDS;
PARTICLE-SIZE; DEPOSITION; PBSE; PHOTODETECTORS; MONOLAYERS; GOLD
AB The stability of colloidal PbS quantum dot (QD) films deposited on various substrates including glass and GaAs was studied. Over a period of months, the QD film sample was re-tested after being left unprotected in air under ambient conditions. Despite exposure to 532 nm laser excitation and cooling to cryogenic temperatures, the initial photoluminescence (PL) remained stable between tests. We also retested a set of samples that had remained under ambient conditions for over 2 years. To track potential changes to the QDs over time, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), optical microscopy, UV-Vis-NIR spectrophotometry and atomic force microscopy (AFM) were employed. Evidence points towards oxidation enforced shrinking of the active QD volume causing a blue shift of the absorption and photoluminescence. The presented studies are important for reliability expectations of light emitters based on PbS QDs.
C1 [Wang, Joanna S.; Steenbergen, Elizabeth H.; Smith, Howard E.; Grazulis, Lawrence; Massengale, Jeremy A.; Ullrich, Bruno; Brown, Gail J.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Wang, JS (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
NR 33
TC 2
Z9 2
U1 1
U2 17
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9403-0
J9 PROC SPIE
PY 2013
VL 8634
AR 86340T
DI 10.1117/12.2002499
PG 10
WC Nanoscience & Nanotechnology; Optics
SC Science & Technology - Other Topics; Optics
GA BGH37
UT WOS:000322967200010
ER
PT S
AU Evans, JW
Berry, PA
Schepler, KL
AF Evans, Jonathan W.
Berry, Patrick A.
Schepler, Kenneth L.
BE Clarkson, WA
Shori, RK
TI A broadly tunable continuous-wave Fe:ZnSe laser
SO SOLID STATE LASERS XXII: TECHNOLOGY AND DEVICES
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Solid State Lasers XXII - Technology and Devices
CY FEB 03-05, 2013
CL San Francisco, CA
SP SPIE
DE solid-state lasers; mid-IR lasers; transition-metal lasers
ID CRYSTALS; ZNSE
AB We have achieved similar to 840 m W continuous-wave (CW) output power from iron-doped zinc selenide (Fe:ZnSe).(1) The beam quality was measured to be M-2 <= 1.2. The laser exhibited a slope efficiency of 47% with no thermal roll-off at maximum output power. Various dichroic mirrors and other spectral filters were inserted into the cavity to discretely tune the output of the laser from 3843 nm to 4337 nm. Demonstration of arbitrary discrete tuning shows that, in principle, Fe: ZnSe is capable of efficient continuously-tunable CW lasing over nearly 500 nm of bandwidth.
C1 [Evans, Jonathan W.; Berry, Patrick A.; Schepler, Kenneth L.] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Evans, JW (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM jonathan.evans@wpafb.af.mil
OI Berry, Patrick/0000-0003-1294-6509; Schepler,
Kenneth/0000-0001-9658-2305
NR 10
TC 0
Z9 0
U1 1
U2 11
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9368-2
J9 PROC SPIE
PY 2013
VL 8599
AR 85990C
DI 10.1117/12.2002442
PG 8
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BFY46
UT WOS:000321895100010
ER
PT S
AU Haynes, ND
Zelmon, DE
AF Haynes, Nicholas D.
Zelmon, David E.
BE Clarkson, WA
Shori, RK
TI Optical and Spectroscopic properties of Ytterbium-doped YAG
SO SOLID STATE LASERS XXII: TECHNOLOGY AND DEVICES
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Solid State Lasers XXII - Technology and Devices
CY FEB 03-05, 2013
CL San Francisco, CA
SP SPIE
ID RARE-EARTH IONS; ABSORPTION INTENSITIES; LASER; CRYSTAL; ER3+; ND3+
AB The refractive indices of Yb:YAG crystals for 0, 1, 3, 5, 7, and 10 at. % Yb were measured from 0.4-5.2 microns. The coefficients for the Sellmeier fit are reported. The absorption at room temperature was measured from .185-3.3 microns. Using the index and spectroscopic data, the oscillator strengths for the samples were calculated, and their dependence on dopant concentration examined.
C1 [Haynes, Nicholas D.; Zelmon, David E.] USAF, Res Lab, Mat & Mfg Directorate, AFRL RXAP, Wright Patterson AFB, OH 45433 USA.
RP Haynes, ND (reprint author), USAF, Res Lab, Mat & Mfg Directorate, AFRL RXAP, Wright Patterson AFB, OH 45433 USA.
NR 22
TC 0
Z9 0
U1 1
U2 6
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9368-2
J9 PROC SPIE
PY 2013
VL 8599
AR 859910
DI 10.1117/12.2000069
PG 10
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BFY46
UT WOS:000321895100032
ER
PT S
AU McDaniel, SA
Berry, PA
Schepler, KL
AF McDaniel, Sean A.
Berry, Patrick A.
Schepler, Kenneth L.
BE Clarkson, WA
Shori, RK
TI Gain-switched single-pass Cr:ZnSe amplifier
SO SOLID STATE LASERS XXII: TECHNOLOGY AND DEVICES
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Solid State Lasers XXII - Technology and Devices
CY FEB 03-05, 2013
CL San Francisco, CA
SP SPIE
DE Solid-state lasers; transition-metal lasers; mid-IR lasers; amplifier;
chromium
ID LASER
AB In this paper, we report on building and testing a Cr:ZnSe gain-switched amplifier pumped by a Q-switched Ho:YAG laser and seeded by a continuous wave (CW) tunable Cr: ZnSe laser. A 0.5%-doped, Brewster-cut Ho: YAG rod in an actively Q-switched, folded cavity produced 250 mu J pump pulses at 2.09 mu m with pulse widths on the order of 400 ns. The seeded single-pass Cr: ZnSe amplifier exhibited output pulse energy as high as 3.8 mu J at 2.45 mu m while pumped at a 10 kHz repetition rate. The gain-switched process showed a peak gain of 380 and an extraction efficiency of 1.5%. The system was tunable from 2160 nm to 2560 nm and had gain of 200 over a 400 nm range.
C1 [McDaniel, Sean A.] Sci Applicat Int Corp, 3745 Pentagon Blvd, Beavercreek, OH 45431 USA.
[Berry, Patrick A.; Schepler, Kenneth L.] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP McDaniel, SA (reprint author), Sci Applicat Int Corp, 3745 Pentagon Blvd, Beavercreek, OH 45431 USA.
EM sean.mcdaniel.ctr@wpafb.af.mil
OI Berry, Patrick/0000-0003-1294-6509; Schepler,
Kenneth/0000-0001-9658-2305
NR 9
TC 0
Z9 0
U1 0
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9368-2
J9 PROC SPIE
PY 2013
VL 8599
AR 85990D
DI 10.1117/12.2004753
PG 8
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BFY46
UT WOS:000321895100011
ER
PT J
AU Hagen, JT
Mullins, BE
AF Hagen, John T.
Mullins, Barry E.
GP IEEE
TI TCP veto: A novel network attack and its application to SCADA protocols
SO 2013 IEEE PES INNOVATIVE SMART GRID TECHNOLOGIES (ISGT)
LA English
DT Proceedings Paper
CT Conference of the IEEE PES on Innovative Smart Grid Technologies (ISGT)
CY FEB 24-27, 2013
CL Washington, DC
SP IEEE PES
DE Cyberspace; Intrusion detection; IP networks; Message authentication;
Network security; SCADA systems; TCPIP
AB TCP veto is a detection-resistant variation of the TCP connection hijacking attack. While not limited to SCADA protocols, Modbus TCP, the Ethernet Industrial Protocol (EtherNet/IP), and the Distributed Network Protocol (DNP3) each meet the necessary assumptions of the attack. Experimental results reveal that the integrity of messages transmitted using each of the three SCADA protocols are vulnerable to TCP veto. Additionally, TCP veto produces up to 600 times less network traffic during its attack than connection hijacking. This work underscores the vulnerability of current SCADA protocols that communicate over TCP/IP to network attack. A method to definitively identify TCP veto requires a detection system to perform deep packet inspection on every TCP packet of a monitored connection. Methods for mitigating the attack through message authentication include implementing DNP3 with Secure Authentication, tcpcrypt, or Internet Protocol Security (IPsec).
C1 [Hagen, John T.; Mullins, Barry E.] USAF, Elect & Comp Engn Dept, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Hagen, JT (reprint author), USAF, Elect & Comp Engn Dept, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM johnthagen@ieee.org; barry.mullins@afit.edu
NR 15
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-4896-6
PY 2013
PG 6
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BFM26
UT WOS:000320500800002
ER
PT J
AU Strack, G
Babanova, S
Farrington, KE
Luckarift, HR
Atanassov, P
Johnson, GR
AF Strack, Guinevere
Babanova, Sofia
Farrington, Karen E.
Luckarift, Heather R.
Atanassov, Plamen
Johnson, Glenn R.
TI Enzyme-Modified Buckypaper for Bioelectrocatalysis
SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY
LA English
DT Article
ID DIRECT ELECTRON-TRANSFER; GLUCOSE-DEHYDROGENASE; CARBON ELECTRODES;
CELL; BIOSENSORS
AB Direct bioelectrocatalysis was demonstrated-with pyrroloquinoline quinone-dependent glucose dehydrogenase (PQQ-GDH) tethered to a range of carbon nanotube (CNT) materials, as evidenced by the generation of anodic current in the presence of glucose. Physical and electrochemical characterization of CNT paper (buckypaper) reveals marked differences attributed to changes in CNT dimensions, including conductivity, packing density, and electrochemically accessible surface area. By using single-walled CNTs as the electrode material, higher current densities per geometric area and lower electron transfer resistances were achieved. In comparison, electrodes made of oxidized CNTs enhanced in the physical adsorption of PQQ, but displayed voltage drops associated with activation losses. In addition, electrode longevity tests revealed that electrochemical activity was retained for two days but decreased by 50% on the third day. PQQ-GDH enzymatic electrodes show potential application as biological fuel cell anodes and will oxidize a range of mono- and disaccharide substrates. (C) 2013 The Electrochemical Society.
C1 [Strack, Guinevere; Farrington, Karen E.; Luckarift, Heather R.; Johnson, Glenn R.] Air Force Res Lab, Airbase Technol Div, Tyndall AFB, FL 32403 USA.
[Strack, Guinevere] Oak Ridge Inst Sci & Engn, Oak Ridge, TN 37831 USA.
[Babanova, Sofia; Atanassov, Plamen] Univ New Mexico, Ctr Emerging Energy Technol, Albuquerque, NM 87131 USA.
[Farrington, Karen E.; Luckarift, Heather R.] Univ Technol Corp, Dayton, OH 45432 USA.
RP Strack, G (reprint author), Air Force Res Lab, Airbase Technol Div, Tyndall AFB, FL 32403 USA.
EM glenn.johnson@i3-corps.com
FU U.S. Department of Energy; Air Force Research Laboratory, Materials and
Manufacturing Directorate, Airbase Technologies Division (AFRL/RXQ);
NSF-CRET
FX The authors acknowledge Buckeye Composites for manufacturing
made-to-order BP and providing detailed characterization of the
material. This research was supported in part by an appointment to the
Postgraduate Research Participation Program at the Air Force Research
Laboratory administered by the Oak Ridge Institute for Science and
Education (ORISE) through an interagency agreement between the U.S.
Department of Energy and the Air Force Research Laboratory, Materials
and Manufacturing Directorate, Airbase Technologies Division (AFRL/RXQ).
University of New Mexico work was supported by funding from the NSF-CRET
Biosensing Program: Collaborative Research: Supramolecular
Bio-Nano-Architectures as Biosensing Platforms.
NR 25
TC 17
Z9 17
U1 3
U2 29
PU ELECTROCHEMICAL SOC INC
PI PENNINGTON
PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA
SN 0013-4651
EI 1945-7111
J9 J ELECTROCHEM SOC
JI J. Electrochem. Soc.
PY 2013
VL 160
IS 7
BP G3178
EP G3182
DI 10.1149/2.028307jes
PG 5
WC Electrochemistry; Materials Science, Coatings & Films
SC Electrochemistry; Materials Science
GA 183DQ
UT WOS:000321794600029
ER
PT S
AU Barnaby, H
Edwards, A
Oleksy, D
Kozicki, M
AF Barnaby, Hugh
Edwards, Arthur
Oleksy, David
Kozicki, Michael
GP IEEE
TI Finite Element Modeling of Ag Transport and Reactions in Chalcogenide
Glass Resistive Memory
SO 2013 IEEE AEROSPACE CONFERENCE
SE IEEE Aerospace Conference Proceedings
LA English
DT Proceedings Paper
CT IEEE Aerospace Conference
CY MAR 02-09, 2013
CL Big Sky, MT
SP IEEE
ID METALLIZATION CELL DEVICES; DENSITY-FUNCTIONAL THEORY; GE-SE GLASSES;
DIFFUSION; FILMS; GAP
AB Silver-based electrochemical memories show enormous potential for non-volatile memory applications. While several groups have made significant strides in device development and process integration, challenges remain to improve function and reliability. The central problem is the large variability of operational parameters and programmed resistance. To understand these variabilities, we need to understand the physics of conducting filament formation and dissolution. Recently, Monte Carlo simulation techniques have been developed to capture the kinetics of Ag transport and metallic filament formation in resistive memory engineered with chalcogenide glass (ChG) films. In this paper the mechanisms of Ag transport and reactions are modeled using a finite element device simulator. The ChG film is modeled as a wide-bandgap semiconductor with material constants (e. g., bandgap, permittivity, electron affinity) extracted from data reported in literature and the results of first principles density functional theory calculations. Active and inert electrodes are modeled as ideal metals with specified workfunctions. The code solves standard carrier statistics and transport equations (continuity, drift-diffusion, and Poisson) and, simultaneously, performs ion transport and reaction calculations. The essential chemistry captured by the simulator are the reduction/oxidation (RedOx) reactions, incorporated as generation (G) and recombination (R) terms in the continuity equations for both ionic and neutral Ag species in the ChG film. The simulation results show how neutral Ag builds up in the film under applied bias. The simulations also reveal that the neutral Ag density is left unchanged once the bias is removed, which enables memristive action. The results provide strong qualitative evidence that finite element codes can simulate ionic transport and metallic growth in ChG-based resistive memory. Quantitative comparisons to experimental data will be provided in the final paper.
C1 [Barnaby, Hugh; Oleksy, David; Kozicki, Michael] Arizona State Univ, 650 E Tyler Mall, Tempe, AZ 85287 USA.
[Edwards, Arthur] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
RP Barnaby, H (reprint author), Arizona State Univ, 650 E Tyler Mall, Tempe, AZ 85287 USA.
EM hbarnaby@asu.edu; Arthur.Edwards@kirtland.af.mil; David.Oleksy@asu.edu;
michael.kozicki@asu.edu
NR 29
TC 0
Z9 0
U1 0
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1095-323X
BN 978-1-4673-1811-2
J9 AEROSP CONF PROC
PY 2013
PG 9
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BFJ62
UT WOS:000320123903055
ER
PT S
AU Martin, M
Lyke, J
AF Martin, Maurice
Lyke, James
GP IEEE
TI Modular Open Network ARCHitecture (MONARCH): Transitioning Plug-and-Play
to Aerospace
SO 2013 IEEE AEROSPACE CONFERENCE
SE IEEE Aerospace Conference Proceedings
LA English
DT Proceedings Paper
CT IEEE Aerospace Conference
CY MAR 02-09, 2013
CL Big Sky, MT
SP IEEE
DE Plug-and-play; satellite; avionics; modular; reconfigurable; USB;
(IC)-C-2; SpaceWire; SPA; PnPSat; SAE; TacSat-3; APT
AB The Air Force Research Laboratory (AFRL) developed an initial plug-and-play (PnP) capability for spacecraft, similar to USB on personal computers, which better defines hardware and software interfaces and incorporates self-discovery and auto-configuration in order to simplify spacecraft development and reduce cost and schedule. PnP technology was matured through a suborbital PnP flight experiment in September 2007 and a secondary Spacecraft Avionics Experiment (SAE) payload on the TacSat-3 satellite, which launched in May 2009. AFRL developed and submitted a complete set of PnP standards through the American Institute of Aeronautics and Astronautics (AIAA) in 2011. Space electronics to adapt existing satellite components and implement full PnP on satellites in accordance with these AFRL standards was independently developed in alternate hardware implementations by Goodrich Corp under AFRL and by Northrop Grumman under Operationally Responsive Space (ORS). In 2011, AFRL conducted a cost-benefit analysis of PnP and assembled a collaborative review board (CRB) in Sept 2011 to evaluate PnP. This CRB was comprised of representatives from Space and Missiles Center (SMC), National Reconnaissance Organization (NRO), Naval Research Laboratory (NRL), John Hopkins University (JHU) Applied Physics Laboratory (APL), The Aerospace Corporation, and several large commercial and DOD satellite developers. This CRB laid out a transition path to develop and implement PnP standards for implementation in large (> 1000 kg) DOD and commercial satellites. Transition of PnP technology into operational systems continues in PnP architecture studies for SMC, PnP products from multiple space industry vendors, commercial implementations of PnP, and the Northrop Grumman ORS-2 spacecraft currently project to fly in 2014-2015. This paper provides details related to development of PnP technology, AFRL's cost-benefit analysis of PnP, recommendations of the PnP CRB, and on-going efforts to mature and fly PnP technology.
C1 [Martin, Maurice; Lyke, James] USAF, Res Lab, Kirtland AFB, NM 87117 USA.
RP Martin, M (reprint author), USAF, Res Lab, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM maurice.martin@kirtland.af.mil; james.lyke@kirtland.af.mil
NR 4
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1095-323X
BN 978-1-4673-1811-2
J9 AEROSP CONF PROC
PY 2013
PG 10
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BFJ62
UT WOS:000320123901074
ER
PT S
AU McLean, RK
Flatley, BN
Silvius, MD
Hopkinson, KM
AF McLean, Ryan K.
Flatley, Bridget N.
Silvius, Mark D.
Hopkinson, Kenneth M.
GP IEEE
TI FPGA-Based RF Spectrum Merging and Adaptive Hopset Selection
SO 2013 IEEE AEROSPACE CONFERENCE
SE IEEE Aerospace Conference Proceedings
LA English
DT Proceedings Paper
CT IEEE Aerospace Conference
CY MAR 02-09, 2013
CL Big Sky, MT
SP IEEE
AB The radio frequency (RF) spectrum is a limited resource. Spectrum allotment disputes stem from this scarcity as many radio devices are confined to a fixed frequency or frequency sequence. One alternative is to incorporate cognition within a reconfigurable radio platform, therefore enabling the radio to adapt to dynamic RF spectrum environments. In this way, the radio is able to actively sense the RF spectrum, decide, and act accordingly, thereby sharing the spectrum and operating in more flexible manner. In this paper, we present a novel solution for merging many distributed RF spectrum maps into one map and for subsequently creating an adaptive hopset. We also provide an example of our system in operation, the result of which is a pseudorandom adaptive hopset. The paper then presents a novel hardware design for the frequency merger and adaptive hopset selector, both of which are written in VHDL and implemented as a custom IP core on an FPGA-based embedded system using the Xilinx Embedded Development Kit (EDK) software tool. The design of the custom IP core is optimized for area, and it can process a high-volume digital input via a low-latency circuit architecture. The complete embedded system includes the Xilinx PowerPC microprocessor, UART serial connection, and compact flash memory card IP cores, and our custom map merging/hopset selection IP core, all of which are targeted to the Virtex IV FPGA. This system is then incorporated into a cognitive radio prototype on a Rice University Wireless Open Access Research Platform (WARP) reconfigurable radio.
C1 [McLean, Ryan K.; Flatley, Bridget N.; Silvius, Mark D.; Hopkinson, Kenneth M.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 43433 USA.
RP McLean, RK (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, 2950 Hobson Way, Wright Patterson AFB, OH 43433 USA.
EM ryan.mclean@afit.edu; bridget.flatley@afit.edu; mark.silvius@afit.edu;
kenneth.hopkinson@afit.edu
NR 7
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1095-323X
BN 978-1-4673-1811-2
J9 AEROSP CONF PROC
PY 2013
PG 8
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BFJ62
UT WOS:000320123902005
ER
PT S
AU Ratkevich, B
Brierley, S
Lupia, D
Leiker, CT
AF Ratkevich, Brian
Brierley, Scott
Lupia, David
Leiker, Capt Troy
GP IEEE
TI Space Launch Flight Termination System Initial Development
SO 2013 IEEE AEROSPACE CONFERENCE
SE IEEE Aerospace Conference Proceedings
LA English
DT Proceedings Paper
CT IEEE Aerospace Conference
CY MAR 02-09, 2013
CL Big Sky, MT
SP IEEE
DE SLFTS; EELV; EFTS; CRD; Flight Termination System; High-Alphabet
AB This paper describes the studies, capabilities and challenges in initial development of a new digital encrypted termination system for space launch vehicles. This system is called the Space Launch Flight Termination System (SLFTS). Development of SLFTS is required to address an obsolescence issue and to improve the security of flight termination systems presently in use on the nation's space launch vehicles. SLFTS development was implemented in a four phase approach with the goal of producing a high secure, cost effective flight termination system for United Launch Alliance (ULA) and the United States Air Force (USAF) Evolved Expendable Launch Vehicle (EELV). These detailed study phases developed the requirements, design and implementation approach for a new high secure flight termination system. Studies led to a cost effective approach to replace the High Alphabet Command Receiver Decoders (HA-CRD) presently used on the EELV (Delta-IV & Atlas-V), with a common SLFTS unit. SLFTS is the next generation flight termination system for space launch vehicles, providing an assured high secure command destruct system for launch vehicles in flight. The unique capabilities and challenges to develop this technology for space launch use will be addressed in this paper in detail.
This paper summarizes the current development status, design and capabilities of SLFTS for EELV.
C1 [Ratkevich, Brian; Brierley, Scott] United Launch Alliance, 7630 S Chester St, Centennial, CO 80112 USA.
[Lupia, David] Cincinnati Elect, L3 Comm, Mason, OH 45040 USA.
[Leiker, Capt Troy] US Air Force, Los Angeles, CA 90245 USA.
RP Ratkevich, B (reprint author), United Launch Alliance, 7630 S Chester St, Centennial, CO 80112 USA.
EM brian.a.ratkevich@ulalaunch.com; scott.r.brierley@ulalaunch.com;
david.lupia@L-3com.com; troy.leiker@us.af.mil
NR 4
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1095-323X
BN 978-1-4673-1811-2
J9 AEROSP CONF PROC
PY 2013
PG 9
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BFJ62
UT WOS:000320123901094
ER
PT S
AU Pavlidis, S
Morcillo, CAD
Song, P
Khan, WT
Fitch, R
Gillespie, J
Febo, R
Quach, T
Papapolymerou, J
AF Pavlidis, Spyridon
Morcillo, Carlos A. Donado
Song, Peter
Khan, Wasif T.
Fitch, Robert
Gillespie, James
Febo, Rey
Quach, Tony
Papapolymerou, John
GP IEEE
TI A Hybrid GaN/Organic X-Band Transmitter Module
SO 2013 IEEE RADIO AND WIRELESS SYMPOSIUM (RWS)
SE IEEE Radio and Wireless Symposium
LA English
DT Proceedings Paper
CT IEEE Radio and Wireless Symposium (RWS)
CY JAN 20-23, 2013
CL Austin, TX
SP IEEE, IEEE Microwave Theory & Tech Soc (MTT-S), IEEE Antennas & Propagat Soc, IEEE Commun Soc (ComSoc), IEEE Engn Med & Biol Soc (EMBS)
DE Gallium nitride; organic materials; x-band; power amplifier; antenna
arrays
AB The design and implementation of a compact, flexible and lightweight X-band transmitter (Tx) module based on high-power gallium nitride (GaN) transistor technology and a low-cost organic package made from liquid crystal polymer (LCP) is presented. In-package measurements of the power amplifier (PA) at 8 GHz show a P.A.E.(max) of >31%, P-1dB of 20 dBm and gain of 11.42 dB. A 4x1 patch antenna array was also fabricated on the same platform. Though no thermal management was used, an effective isotropically radiated power (EIRP) in excess of 20 dBm at 10 GHz was measured for the transmitter module, consisting of only a single-stage PA and antenna array, thus demonstrating that even greater performance can be achieved in the future.
C1 [Pavlidis, Spyridon; Morcillo, Carlos A. Donado; Song, Peter; Khan, Wasif T.; Papapolymerou, John] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA.
[Fitch, Robert; Gillespie, James; Febo, Rey; Quach, Tony] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Pavlidis, S (reprint author), Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA.
EM spavlidis@gatech.edu
NR 10
TC 1
Z9 1
U1 2
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2164-2958
BN 978-1-4673-2932-3; 978-1-4673-2929-3
J9 IEEE RADIO WIRELESS
PY 2013
BP 241
EP 243
PG 3
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BFO61
UT WOS:000320762900078
ER
PT S
AU Duan, XF
Pachter, R
Brewer, KJ
Farmer, BL
AF Duan, Xiaofeng
Pachter, Ruth
Brewer, Karen J.
Farmer, Barry L.
BE Alexandrov, V
Lees, M
Krzhizhanovskaya, V
Dongarra, J
Sloot, PMA
TI A density functional theory investigation on the properties of
supramolecular catalysts for photoinitiated electron collection
SO 2013 INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE
SE Procedia Computer Science
LA English
DT Proceedings Paper
CT 13th Annual International Conference on Computational Science (ICCS)
CY JUN 05-07, 2013
CL Barcelona, SPAIN
SP Univ Amsterdam, Univ Tennessee, Nanyang Technol Univ, Barcelona Super Comp Ctr
DE Mixed-metal supramolecular complex; density functional theory; time
dependent density functional theory; electronic spectrum; electron
transfer
ID PHOTOCATALYTIC HYDROGEN-PRODUCTION; LIGHT INDUCED PHOTOCLEAVAGE; TD-DFT;
COMPLEXES; DNA; BPY=2,2-BIPYRIDINE; RHODIUM(III); ABSORPTION; CHARGE
AB In this work we investigated by density functional theory (DFT)/time-dependent DFT (TDDFT) supramolecular complexes for photoinitiated electron collection, in particular [{(bpy)(2)Ru(dpp)}(2)RhCl2](5+) and related catalysts derived by variation of the ligand/metal. The electron collection in this class of catalysts enables hydrogen production or DNA cleavage, among other applications. Changes in excitation energies upon variation of the ligand/metal were mostly consistent with experiment, and within the expected TDDFT accuracy, thus enabling their use as the basis for further analysis. Indeed, the consistency observed between the predicted excitation energy and the bridging ligand's reduction potential can assist in catalyst design for electron collection. Calculated fragment orbital energies could explain, in part, changes in the propensity towards photocleavage of DNA.
C1 [Duan, Xiaofeng; Pachter, Ruth; Farmer, Barry L.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Duan, Xiaofeng] Air Force Res Lab, DoD Supercomp Resource Ctr, Wright Patterson AFB, OH 45433 USA.
[Brewer, Karen J.] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA.
RP Pachter, R (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM Ruth.Pachter@wpafb.af.mil
RI Dongarra, Jack/E-3987-2014
NR 22
TC 0
Z9 0
U1 0
U2 3
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1877-0509
J9 PROCEDIA COMPUT SCI
PY 2013
VL 18
BP 779
EP 786
DI 10.1016/j.procs.2013.05.242
PG 8
WC Computer Science, Theory & Methods
SC Computer Science
GA BFR52
UT WOS:000321051200079
ER
PT J
AU Coletta, D
Garcia, D
AF Coletta, D.
Garcia, D.
BE Matlary, JH
Petersson, M
TI Willing and Able? Spanish Statecraft as Brokerage
SO NATO'S EUROPEAN ALLIES: MILITARY CAPABILITY AND POLITICAL WILL
LA English
DT Article; Book Chapter
ID COLD-WAR; STRATEGIC CULTURE; EUROPE; SPAIN
C1 [Coletta, D.] US Air Force Acad, Colorado Springs, CO USA.
[Garcia, D.] Univ Complutense Madrid, Dept Int Studies, E-28040 Madrid, Spain.
RP Coletta, D (reprint author), US Air Force Acad, Colorado Springs, CO USA.
NR 97
TC 1
Z9 1
U1 0
U2 0
PU PALGRAVE
PI BASINGSTOKE
PA HOUNDMILLS, BASINGSTOKE RG21 6XS, ENGLAND
BN 978-1-137-03500-4
PY 2013
BP 178
EP 204
D2 10.1057/9781137035004
PG 27
WC History; International Relations
SC History; International Relations
GA BFI09
UT WOS:000319964800010
ER
PT J
AU Nergiz, SZ
Slocik, JM
Naik, RR
Singamaneni, S
AF Nergiz, Saide Z.
Slocik, Joseph M.
Naik, Rajesh R.
Singamaneni, Srikanth
TI Surface defect sites facilitate fibrillation: an insight into adsorption
of gold-binding peptides on Au(111)
SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS
LA English
DT Article
ID SELF-ASSEMBLING PEPTIDES; ATOMIC-FORCE MICROSCOPY; MOLECULAR
BIOMIMETICS; AQUEOUS-SOLUTION; NANOPARTICLES; INTERFACE; METAL;
PALLADIUM; DIFFUSION; PROTEINS
AB We report new evidence on the surface defect dependent fibrillation of cysteine-free gold-binding peptides (identified from a phage-display peptide library) upon adsorption onto the Au(111) surface revealed using atomic force microscopy (AFM). Dramatic changes in the persistence length and binding conformation of the peptide fibrils on Au(111) have been demonstrated to occur via surface reorganization of the peptide. Moreover, surface defect sites played a governing role in initiating fibrillation. These observations could provide new insight into engineering bio-nano interfaces for self-assembly, biotemplating and biotic-abiotic hybrid material systems and device platforms.
C1 [Nergiz, Saide Z.; Singamaneni, Srikanth] Washington Univ, Dept Mech Engn & Mat Sci, St Louis, MO 63110 USA.
[Slocik, Joseph M.; Naik, Rajesh R.] Wright Patterson Air Force Base, Mat & Mfg Directorate, Soft Matter Mat Branch, Dayton, OH USA.
RP Singamaneni, S (reprint author), Washington Univ, Dept Mech Engn & Mat Sci, 1 Brooking Dr, St Louis, MO 63110 USA.
EM singamaneni@seas.wustl.edu
FU AFRL/RX; AFOSR
FX We would like thank AFRL/RX and AFOSR for financial support.
NR 39
TC 5
Z9 5
U1 10
U2 54
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1463-9076
J9 PHYS CHEM CHEM PHYS
JI Phys. Chem. Chem. Phys.
PY 2013
VL 15
IS 28
BP 11629
EP 11633
DI 10.1039/c3cp50972a
PG 5
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 175AN
UT WOS:000321201500005
PM 23775036
ER
PT S
AU Blackshire, JL
AF Blackshire, James L.
BE Thompson, DO
Chimenti, DE
TI FORWARD AND BACKSCATTER ENERGY FIELD PATTERNS FROM LOCALIZED DAMAGE
SITES
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Ultrasonic Testing; Diffraction; Wavefronts
ID DIFFRACTION; ULTRASOUND; INSPECTION; CRACKS
AB The scattering of ultrasound energy from localized damage sites has been studied extensively by numerous researchers and is of significant interest for quantitative NDE. Damage detection and basic sizing information have, for example, been provided using scattered energy reflection and transmission levels, time-of-flight signal analysis, crack-tip diffraction, and many other methods. In the present effort, finite element models and experimental measurements are used to understand edge diffraction effects, which can impact both the detection and accurate sizing of damage features. The results suggest that edge diffraction can generate localized energy fields in the forward and backscatter directions, causing signal content to vary. A simple analytic explanation of the observed effects is provided along with potential implications for damage characterization - both positive and negative.
C1 USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Blackshire, JL (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM James.Blackshire@wpafb.af.mil
NR 13
TC 0
Z9 0
U1 1
U2 1
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 91
EP 98
DI 10.1063/1.4789035
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600009
ER
PT S
AU Nalladega, V
Sathish, S
Blodgett, M
AF Nalladega, V.
Sathish, S.
Blodgett, M.
BE Thompson, DO
Chimenti, DE
TI INVESTIGATION OF ACOUSTIC FIELDS GENERATED BY EDDY CURRENTS USING AN
ATOMIC FORCE MICROSCOPE
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantitative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Acoustic Fields; Eddy Currents; Atomic Force Microscopy
ID TRANSDUCERS; DESIGN; WAVE
AB This paper reports the experimental measurement and imaging of the acoustic fields generated by low-frequency eddy currents in metals in the absence of an external static magnetic field using a modified atomic force microscope. Acoustic displacements in a typical metal placed in eddy current field without static magnetic field were theoretically computed and found to be in the range of few hundred picometers. A modified atomic force microscope was used to detect and measure the acoustic displacements in a single crystal copper. The setup was also used to image acoustic fields in a titanium alloy sample. Details of the modified AFM to measure and image acoustic displacements are presented. The role of electrical and elastic properties on the contrast in acoustic images of Ti-6Al-4V sample is discussed.
C1 [Nalladega, V.; Sathish, S.] Univ Dayton, Res Inst, Struct Integr Div, 300 Coll Pk, Dayton, OH 45469 USA.
[Blodgett, M.] Air Force Res Lab, Met Ceram & NDE Div, Wright Patterson AFB, OH 45433 USA.
RP Nalladega, V (reprint author), Univ Dayton, Res Inst, Struct Integr Div, 300 Coll Pk, Dayton, OH 45469 USA.
EM Nalladegav1@udayton.edu; shamachary.sathish.ctr@wpafb.af.mil
FU Dayton Area Graduate Studies Institute (DAGSI); AFRL, Wright-Patterson
Air Force Base [FA8650-09-D5224, F33615-03-3-9001, F33615-03-C-5219]
FX V. Nalladega acknowledges the financial support of the Dayton Area
Graduate Studies Institute (DAGSI). The authors acknowledge the
financial support from AFRL, Wright-Patterson Air Force Base, for this
study under contract # FA8650-09-D5224, F33615-03-3-9001 and
F33615-03-C-5219.
NR 15
TC 0
Z9 0
U1 0
U2 2
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 449
EP 455
DI 10.1063/1.14789082
PG 7
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600056
ER
PT S
AU Cherry, A
Knopp, J
Aldrin, JC
Sabbagh, HA
Boehnlein, T
Mooers, R
AF Cherry, Aaron
Knopp, Jeremy
Aldrin, John C.
Sabbagh, Harold A.
Boehnlein, Thomas
Mooers, Ryan
BE Thompson, DO
Chimenti, DE
TI ROLE OF VARYING INTERFACE CONDITIONS ON THE EDDY CURRENT RESPONSE FROM
CRACKS IN MULTILAYER STRUCTURES
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantitative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Eddy Current; Contact Conditions; Gaps; Models; Multilayer Structures
ID CURRENT INSPECTION; SITES
AB There is a need to improve the understanding of the role of interface conditions on eddy current inspections for cracks in multilayer aircraft structures. This paper presents initial experimental and simulated results studying the influence of gaps and contact conditions between two plates with a notch in the second layer. Simulations show an amplification of the eddy current signal for a subsurface notch adjacent to an air gap as opposed to a submerged notch in a solid plate.
C1 [Cherry, Aaron] Southwestern Ohio Council Higher Educ, Dayton, OH 45420 USA.
[Knopp, Jeremy] Struct Mat Div, AFRL, Wright Patterson AFB, OH 45433 USA.
Comp Tools, Chicago, IL 60031 USA.
[Sabbagh, Harold A.] LLC, Victor Technol, Bloomington, IN 47401 USA.
[Boehnlein, Thomas; Mooers, Ryan] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
RP Cherry, A (reprint author), Southwestern Ohio Council Higher Educ, Dayton, OH 45420 USA.
EM aaron.cherry.ctr@wpafb.af.mil; aldrin@computationaltools.com;
has@sabbagh.com; rymooers32@gmail.com
FU Air Force Office of Scientific Research (AFOSR) [11RX15COR]
FX The authors wish to thank the Air Force Office of Scientific Research
(AFOSR) and Dr. David Stargel in particular for supporting this research
under task number 11RX15COR.
NR 11
TC 0
Z9 0
U1 0
U2 2
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 456
EP 463
DI 10.1063/1.14789083
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600057
ER
PT S
AU Aldrin, JC
Motes, D
Forsyth, DS
Steffes, G
AF Aldrin, John C.
Motes, Doyle
Forsyth, David S.
Steffes, Gary
BE Thompson, DO
Chimenti, DE
TI ENHANCED IMAGE PROCESSING METHODS FOR GMR ARRAY INSPECTIONS OF
MULTILAYER METALLIC STRUCTURES
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantitative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Arrays; Cracks; Eddy Current; Giant Magnetoresistive Sensors; Image
Processing
ID SENSOR
AB The objective of this paper is to present a comprehensive approach to image processing for Giant Magnetoresistive (GMR) array sensors with sheet current sources for the inspection of fatigue cracks in complex metallic structures. The approach incorporates optimal phase angle adjustment, array sensitivity compensation, fastener site identification, an adaptive edge evaluation and removal algorithm and a classification metric. Processing examples are presented that highlight the benefits of these algorithms for improving crack detection for challenging edge and fastener spacing conditions.
C1 [Aldrin, John C.] Computat Tools, 4275 Chatham Ave, Gurnee, IL 60031 USA.
[Steffes, Gary] Wright Patterson AFB, AFRL, RXLP, Wright Patterson AFB, OH 45433 USA.
[Motes, Doyle; Forsyth, David S.] TRI Austin, Austin, TX 78746 USA.
RP Aldrin, JC (reprint author), Computat Tools, 4275 Chatham Ave, Gurnee, IL 60031 USA.
EM aldrin@computationaltools.com
FU UTC [10-S7104-01-C1]; AFRL [FA8650-10-D-5210]; Mark Keiser of
TRI/Austin; Charles Buynak; Eric Lindgren; Steve Russ of AFRL; Nancy
Wood; David Fortner; Don Palmer of Boeing
FX Work on this program is performed under: UTC Subcontract #
10-S7104-01-C1 and AFRL Prime Contract # FA8650-10-D-5210. The authors
would like to thank Mark Keiser of TRI/Austin, Charles Buynak, Eric
Lindgren, and Steve Russ of AFRL, and Nancy Wood, David Fortner, and Don
Palmer of Boeing for support for this work.
NR 9
TC 0
Z9 0
U1 0
U2 2
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 699
EP 706
DI 10.1063/1.4789114
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600088
ER
PT S
AU Dierken, J
Aldrin, JC
Holec, R
LaCivita, M
Shearer, J
Lindgren, E
AF Dierken, Josiah
Aldrin, John C.
Holec, Robert
LaCivita, Michael
Shearer, Joshua
Lindgren, Eric
BE Thompson, DO
Chimenti, DE
TI PROGRESS IN DEFECT QUANTIFICATION IN MULTI-LAYERED STRUCTURES USING
ULTRASONIC INSPECTION
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantitative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Fastener Sites; Image Processing; Multilayer Structures; Ultrasonic NDE
AB This study investigates the ability to resolve flaws in aluminum panel stack-ups representative of aircraft structural components. Using immersion ultrasound techniques, the specimens were examined for known fatigue cracks and electric discharge machined (EDM) notches at various fastener sites. Initial assessments suggested a possible trend between measured ultrasound parameters of flaw intensity and size, and known physical defect length. To improve analytical reliability and efficiency, development of automated data analysis (ADA) algorithms has been initiated.
C1 [Dierken, Josiah] Southwestern Ohio Council Higher Educ, Dayton, OH 45420 USA.
[LaCivita, Michael; Shearer, Joshua; Lindgren, Eric] Air Force Base Wright Patterson, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Aldrin, John C.] Computat Tools, Gurnee 60031, IL USA.
[Holec, Robert] Iowa State Univ, Ames, IA 50011 USA.
RP Dierken, J (reprint author), Southwestern Ohio Council Higher Educ, Dayton, OH 45420 USA.
EM josiah.dierken.ctr@wpafb.af.mil; aldrin@computationaltools.com;
eric.lindgren@wpafb.af.mil
NR 6
TC 1
Z9 1
U1 1
U2 4
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 769
EP 776
DI 10.1063/1.4789123
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600097
ER
PT S
AU Chen, MY
Ko, RT
Hoppe, WC
Blackshire, JL
AF Chen, M. Y.
Ko, R. T.
Hoppe, W. C.
Blackshire, J. L.
BE Thompson, DO
Chimenti, DE
TI ULTRASONIC ASSESSMENT OF BONDING INTEGRITY IN FOAM-BASED HYBRID
COMPOSITE MATERIALS
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantitative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Ultrasound; Bonding Integrity; Foam-Based; Hybrid Composite Materials
AB Ultrasonic assessment of the bonding integrity between a composite layer and a foam substrate in foam-based hybrid composite materials was explored. The challenges of this task are: (1) the foam has air-like acoustic impedance and (2) contact surface wave generation on polymer matrix composites (PMC) is not conventional. To meet these challenges, a novel wedge made of a low velocity material was developed. The results showed that the bonding condition in these composites can be identified by monitoring the amplitude of the ultrasonic signals received.
C1 [Chen, M. Y.; Blackshire, J. L.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Ko, R. T.; Hoppe, W. C.] Univ Dayton, Res Inst, College Pk, MD 45469 USA.
RP Chen, MY (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Ray.Ko@udri.udayton.edu; wally.hoppe@udri.udayton.edu;
James.Blackshire@wpafb.af.mil
FU Air Force [FA8650-05-D-5052]
FX This work was performed under Air Force contract #FA8650-05-D-5052.
NR 4
TC 1
Z9 1
U1 0
U2 3
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 995
EP 1002
DI 10.1063/1.4789152
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600126
ER
PT S
AU Flattum, RY
Cooney, AT
AF Flattum, Richard Y.
Cooney, Adam T.
BE Thompson, DO
Chimenti, DE
TI NON-DESTRUCTIVE EVALUATION OF DEGRADATION IN EB-PVD THERMAL BARRIER
COATINGS BY INFRARED REFLECTANCE SPECTROSCOPY
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Infrared; Spectroscopy; Thermal Barrier Coating
ID CREEP-BEHAVIOR; ZIRCONIA; SYSTEMS
AB At room temperature and atmospheric conditions infrared reflectance spectroscopy and X-ray diffraction were employed for the detection of the phase transformation and residual stress within thermal barrier coatings (TBC). The TBC's samples initially consisted of the porous ceramic topcoat deposited by electron beam plasma vapor deposition, a bond coat and a superalloy substrate. Reflectance spectroscopy scans were performed from 7497 cm(-1) to 68 cm-1 to analysis the fingerprint region as well as the chemical bonding region. These regions should indicate if a detectable change within the TBC response is a result of thermal degradation of the microstructure and the changes in yttrium dispersion throughout the yttrium stabilized zirconium. The thermal degradation was induced by thermal cycling the samples to 1100 C and then cooling them in an atmospheric environment. X-ray diffraction was also used to detect the phase composition within the TBC samples and see if either would clearly identify failure prior to actual spallation. The eventual measurability and quantify-ability of the phase changes within the TBC's may be used as an effective non-destructive evaluation (NDE) technique that would allow personnel in the field to know when servicing of the turbine blade was necessary.
C1 [Flattum, Richard Y.; Cooney, Adam T.] USAF, Res Lab, Mat & Mfg Directorate, NonDestruct Evaluat Branch, Wright Patterson AFB, OH 45433 USA.
RP Flattum, RY (reprint author), USAF, Res Lab, Mat & Mfg Directorate, NonDestruct Evaluat Branch, Wright Patterson AFB, OH 45433 USA.
EM richard.flattum-riemers@wpafb.af.mil
NR 21
TC 1
Z9 1
U1 1
U2 10
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 1125
EP 1132
DI 10.1063/1.4789169
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600143
ER
PT S
AU Martin, RW
Mooers, RD
Hutson, AL
Sathish, S
Blodgett, MP
AF Martin, R. W.
Mooers, R. D.
Hutson, A. L.
Sathish, S.
Blodgett, M. P.
BE Thompson, DO
Chimenti, DE
TI NONLINEAR ACOUSTIC MEASUREMENTS AHEAD OF A NOTCH DURING FATIGUE
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Nonlinear Acoustics; Fatigue; beta Parameter; Stress Raiser
ID HARMONIC-GENERATION; DAMAGE
AB This paper presents measurements of relative nonlinear acoustic parameter (beta(rel)), ahead of a notch in Al 7075-T651 dog bone samples, subjected to fatigue. It is compared with crack growth measurements on the same samples. Measurements performed on two samples subjected to identical fatigue conditions that failed at vastly different number of fatigue cycles are described. The beta(rel) measurement for both samples as a function of fatigue cycles was fit a Boltzmann curve. The role of changing beta(rel) ahead of a notch is explored as a possible approach for remain life evaluation.
C1 [Martin, R. W.; Blodgett, M. P.] USAF, Res Lab, RXCA, Wright Patterson AFB, OH 45433 USA.
RP Martin, RW (reprint author), USAF, Res Lab, RXCA, Wright Patterson AFB, OH 45433 USA.
EM rymooers32@gmail.com; shamachary.sathish.ctr@wpafb.af.mil
NR 16
TC 0
Z9 0
U1 0
U2 5
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 1234
EP 1241
DI 10.1063/1.4789184
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600158
ER
PT S
AU Aldrin, JC
Knopp, JS
Sabbagh, HA
AF Aldrin, John C.
Knopp, Jeremy S.
Sabbagh, Harold A.
BE Thompson, DO
Chimenti, DE
TI BAYESIAN METHODS IN PROBABILITY OF DETECTION ESTIMATION AND
MODEL-ASSISTED PROBABILITY OF DETECTION EVALUATION
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantitative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Bayesian Methods; Eddy Current; Model-Assisted POD; POD Evaluation
AB In this paper, the application of Bayesian methods for probability of detection (POD) estimation and the model-assisted probability of detection methodology is explored. A demonstration of Bayesian estimation for an eddy current POD evaluation case study is presented and compared with conventional approaches. Hierarchical Bayes models are introduced for estimating parameters including random variables in physics-based models. Results are presented that demonstrate the feasibility of simultaneously estimating model calibration parameters, model random variables and measurement error.
C1 [Aldrin, John C.] Computat Tools, 4275 Chatham Ave, Gurnee, IL 60031 USA.
[Knopp, Jeremy S.] Wright Patterson AFB, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Sabbagh, Harold A.] Victor Technol LLC, Bloomington, IN 47401 USA.
RP Aldrin, JC (reprint author), Computat Tools, 4275 Chatham Ave, Gurnee, IL 60031 USA.
EM aldrin@computationaltools.com; has@sabbagh.com
FU Air Force Office of Scientific Research (AFOSR) [11RX15COR]
FX The authors wish to thank the Air Force Office of Scientific Research
(AFOSR) and Dr. David Stargel in particular for supporting this research
under task number 11RX15COR. The authors thank Chuck Annis (Statistical
Engineering), David Forsyth (TRI/Austin) and Eric Lindgren (AFRL) for
useful discussions on the subject. The authors also thank Chuck Annis
for his work on the mh1823 software in R and David Forsyth and Chris
Coughlin of TRI/Austin for work on the POD Toolkit. For more information
on using Bayesian tools for POD evaluation, see
www.computationaltools.com/Bayes.
NR 19
TC 1
Z9 1
U1 0
U2 1
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 1733
EP 1740
DI 10.1063/1.4789250
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600224
ER
PT S
AU Sabbagh, EH
Murphy, RK
Sabbagh, HA
Aldrin, JC
Knopp, J
Blodgett, MP
AF Sabbagh, Elias H.
Murphy, R. Kim
Sabbagh, Harold A.
Aldrin, John C.
Knopp, Jeremy
Blodgett, Mark P.
BE Thompson, DO
Chimenti, DE
TI STOCHASTIC-INTEGRAL MODELS FOR PROPAGATION-OF-UNCERTAINTY PROBLEMS IN
NONDESTRUCTIVE EVALUATION
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantitative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Volume-Integral Equations; Electromagnetic Nondestructive Evaluation;
Generalized Polynomial Chaos; Probabilistic Collocation Method
AB Generalized polynomical chaos (gPC), the probabilistic collocation method (PCM), and analysis of variance (ANOVA) are finding considerable application to problems of interest to engineers in which random parameters are an essential feature of the mathematical model. So far the applications have been mainly to stochastic partial differential equations, but we extend the method to volume-integral equations, which have met great success in electromagnetic nondestructive evaluation (NDE), especially with eddy-currents. The problems of main interest to the NDE community in this connection are concerned with the issue of 'propagation of uncertainty' when the relevant parameters are not well characterized, or are known simply as random variables. We demonstrate the ideas by considering a metallic surface that has undergone a shot-peening treatment to reduce residual stresses, and has, therefore, become a random conductivity field. In particular, we show how ANOVA becomes a very promising method for high-dimensional model representation (HDMR) when there are a large number of random variables present in the problem.
C1 [Sabbagh, Elias H.; Murphy, R. Kim; Sabbagh, Harold A.] Victor Technol LLC, POB 7706, Bloomington, IN 47407 USA.
[Aldrin, John C.] Computat Tools, Gurnee, IL 60031 USA.
[Knopp, Jeremy; Blodgett, Mark P.] Wright Patterson AFB, Air Force Res Lab AFRL RXLP, Wright Patterson AFB, OH 45433 USA.
RP Sabbagh, EH (reprint author), Victor Technol LLC, POB 7706, Bloomington, IN 47407 USA.
EM has@sabbagh.com; aldrin@computationaltools.com
NR 11
TC 1
Z9 1
U1 0
U2 2
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 1765
EP 1772
DI 10.1063/1.4789254
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600228
ER
PT S
AU Lindgren, EA
Stargel, D
AF Lindgren, E. A.
Stargel, D.
BE Thompson, DO
Chimenti, DE
TI USAF PERSPECTIVE ON FOUNDATIONAL CHALLENGES FOR ENHANCED DAMAGE SENSING
SO REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 32A
AND 32B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 39th Annual Review of Progress in Quantitative Nondestructive Evaluation
(QNDE)
CY JUL 15-20, 2012
CL Denver, CO
SP QNDE Programs, AF Res Lab, Army Res Lab, Amer Soc Nondestruct Testing (ASNT), Dept Energy, AMES Lab, Fed Aviat Adm (FAA), Natl Aeronaut & Space Adm (NASA), Natl Sci Fdn (NSF), Ind/Univ Cooperat Res Ctr, Iowa State Univ, Ctr Nondestruct Evaluat
DE Damage Sensing; Challenges; Complexity; Variability; Boundary Conditions
AB Structural integrity programs of the United States Air Force (USAF) include periodic inspection to detect damage before it grows to a critical size that can impact the safety of USAF systems. Current inspection methods have been used successfully to ensure the required risk metrics for these systems are being met as mandated by the relevant USAF Standards. However, there is a continual desire to improve the capability of inspection methods while increasing the efficiency and reliability of these methods. As new approaches are being explored for the enhancement of damage sensing, a number of foundational issues that represent hurdles for the application of these enhancements have been identified. This paper provides background of how damage sensing is used by the USAF and expands on identified foundational challenges that represent technical barriers to the implementation of new damage sensing methods. As the desired capability of the damage sensing methods expand from detection of damage to the characterization of damage, the degree of complexity grows and additional challenges emerge. Representative case studies are used to illustrate challenges for detection, localization and characterization of damage.
C1 [Lindgren, E. A.] US AF Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Stargel, D.] Air Force Off Sci Res, US Air Force Res Lab, Arlington, VA 22203 USA.
RP Lindgren, EA (reprint author), US AF Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM eric.lindgren@wpafb.af.mil
NR 11
TC 1
Z9 1
U1 0
U2 1
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1129-6
J9 AIP CONF PROC
PY 2013
VL 1511
BP 1839
EP 1845
DI 10.1063/1.4789264
PG 7
WC Materials Science, Characterization & Testing
SC Materials Science
GA BFM02
UT WOS:000320452600238
ER
PT J
AU Nagraj, N
Slocik, JM
Phillips, DM
Kelley-Loughnane, N
Naik, RR
Potyrailo, RA
AF Nagraj, Nandini
Slocik, Joseph M.
Phillips, David M.
Kelley-Loughnane, Nancy
Naik, Rajesh R.
Potyrailo, Radislav A.
TI Selective sensing of vapors of similar dielectric constants using
peptide-capped gold nanoparticles on individual multivariable
transducers
SO ANALYST
LA English
DT Article
ID CHEMIRESISTOR SENSOR; FILMS; ARRAYS; IDENTIFICATION; HUMIDITY; COATINGS
AB Peptide-capped AYSSGAPPMPPF gold nanoparticles were demonstrated for highly selective chemical vapor sensing using individual multivariable inductor-capacitor-resistor (LCR) resonators. Their multivariable response was achieved by measuring their resonance impedance spectra followed by multivariate spectral analysis. Detection of model toxic vapors and chemical agent simulants, such as acetonitrile, dichloromethane and methyl salicylate, was performed. Dichloromethane (dielectric constant epsilon(r) = 9.1) and methyl salicylate (epsilon(r) - 9.0) were discriminated using a single sensor. These sensing materials coupled to multivariable transducers can provide numerous opportunities for tailoring the vapor response selectivity based on the diversity of the amino acid composition of the peptides, and by the modulation of the nature of peptide-nanoparticle interactions through designed combinations of hydrophobic and hydrophilic amino acids.
C1 [Nagraj, Nandini; Potyrailo, Radislav A.] Gen Elect Global Res Ctr, Chem & Chem Engn Global Technol Domain, Niskayuna, NY USA.
[Slocik, Joseph M.; Phillips, David M.; Naik, Rajesh R.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
[Kelley-Loughnane, Nancy] Air Force Res Lab, Human Effectiveness Directorate, Wright Patterson AFB, OH USA.
RP Potyrailo, RA (reprint author), Gen Elect Global Res Ctr, Chem & Chem Engn Global Technol Domain, Niskayuna, NY USA.
EM Potyrailo@crd.ge.com
FU Air Force Research Laboratory [FA8650-08-C-6869]; GE Corporate
fundamental research funds; AFOSR
FX The authors acknowledge Mallikarjun Karadge for technical assistance,
Ihor Tokarev for the photo shown in Fig. 1B, and James Grande for TEM
image analysis. This work has been supported in part by the Air Force
Research Laboratory (Contract FA8650-08-C-6869), GE Corporate
fundamental research funds, and AFOSR (R.R.N.).
NR 45
TC 6
Z9 6
U1 6
U2 46
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 0003-2654
J9 ANALYST
JI Analyst
PY 2013
VL 138
IS 15
BP 4334
EP 4339
DI 10.1039/c3an00088e
PG 6
WC Chemistry, Analytical
SC Chemistry
GA 174JU
UT WOS:000321152300016
PM 23666395
ER
PT B
AU Pavlidis, S
Morcillo, CAD
Song, P
Khan, WT
Fitch, R
Gillespie, J
Febo, R
Quach, T
Papapolymerou, J
AF Pavlidis, Spyridon
Morcillo, Carlos A. Donado
Song, Peter
Khan, Wasif T.
Fitch, Robert
Gillespie, James
Febo, Rey
Quach, Tony
Papapolymerou, John
GP IEEE
TI A Hybrid GaN/Organic X-Band Transmitter Module
SO 2013 IEEE 13TH TOPICAL MEETING ON SILICON MONOLITHIC INTEGRATED CIRCUITS
IN RF SYSTEMS (SIRF)
LA English
DT Proceedings Paper
CT IEEE 13th Topical Meeting on Silicon Monolithic Integrated Circuits in
RF Systems (SiRF)
CY JAN 21-23, 2013
CL Austin, TX
SP IEEE, MTT S, APS, IEEE Commun Soc, EMB
DE Gallium nitride; organic materials; x-band; power amplifier; antenna
arrays
AB The design and implementation of a compact, flexible and lightweight X-band transmitter (Tx) module based on high-power gallium nitride (GaN) transistor technology and a low-cost organic package made from liquid crystal polymer (LCP) is presented. In-package measurements of the power amplifier (PA) at 8 GHz show a P. A. E. max of >31%, P1dB of 20 dBm and gain of 11.42 dB. A 4x1 patch antenna array was also fabricated on the same platform. Though no thermal management was used, an effective isotropically radiated power (EIRP) in excess of 20 dBm at 10 GHz was measured for the transmitter module, consisting of only a single-stage PA and antenna array, thus demonstrating that even greater performance can be achieved in the future.
C1 [Pavlidis, Spyridon; Morcillo, Carlos A. Donado; Song, Peter; Khan, Wasif T.; Papapolymerou, John] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA.
[Fitch, Robert; Gillespie, James; Febo, Rey; Quach, Tony] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Pavlidis, S (reprint author), Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA.
EM spavlidis@gatech.edu
NR 10
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-1553-1; 978-1-4673-1552-4
PY 2013
BP 141
EP 143
PG 3
WC Engineering, Electrical & Electronic
SC Engineering
GA BFO21
UT WOS:000320727000048
ER
PT J
AU Melko, JJ
Ard, SG
Fournier, JA
Li, J
Shuman, NS
Guo, H
Troe, J
Viggiano, AA
AF Melko, Joshua J.
Ard, Shaun G.
Fournier, Joseph A.
Li, Jun
Shuman, Nicholas S.
Guo, Hua
Troe, Juergen
Viggiano, Albert A.
TI Iron cation catalyzed reduction of N2O by CO: gas-phase temperature
dependent kinetics
SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS
LA English
DT Article
ID STATE-SPECIFIC REACTIONS; FORMING BIMOLECULAR REACTIONS;
TRANSITION-METAL CATIONS; ADIABATIC CHANNEL MODEL; TRANSLATIONAL ENERGY;
2-STATE REACTIVITY; BOND ACTIVATION; CROSS-SECTIONS; DIPOLE CAPTURE;
ATOMIC CATIONS
AB The ion-molecule reactions F-e+ + N2O -> FeO+ + N-2 and FeO+ + CO -> Fe+ + CO2, which catalyze the reaction CO + N2O -> CO2 + N-2, have been studied over the temperature range 120-700 K using a variable temperature selected ion flow tube apparatus. Values of the rate constants for the former two reactions were experimentally derived as k(2) (10(-11) cm(3) s(-1)) = 2.0(+/- 0.3) (T/300)(-1.5(+/- 0.2)) + 6.3(+/- 0.9) exp(-515(+/- 77)/T) and k(3) (10(-10) cm(3) s(-1)) = 3.1(+/- 0.1) (T/300)(-0.9(+/- 0.1)). Characterizing the energy parameters of the reactions by density functional theory at the B3LYP/TZVP level, the rate constants are modeled, accounting for the intermediate formation of complexes. The reactions are characterized by nonstatistical intrinsic dynamics and rotation-dependent competition between forward and backward fluxes. For Fe+ + N2O, sextet-quartet switching of the potential energy surfaces is quantified. The rate constant for the clustering reaction FeO+ + N2O + He -> FeO(N2O)(+) + He was also measured, being k(4) (10(-27) cm(6) s(-1)) = 1.1(+/- 0.1) (T/300)(-2.5(+/- 0.1)) in the low pressure limit, and analyzed in terms of unimolecular rate theory.
C1 [Melko, Joshua J.; Ard, Shaun G.; Shuman, Nicholas S.; Viggiano, Albert A.] Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Fournier, Joseph A.] Yale Univ, Sterling Chem Lab, New Haven, CT 06520 USA.
[Li, Jun; Guo, Hua] Univ New Mexico, Dept Chem & Chem Biol, Albuquerque, NM 87131 USA.
[Troe, Juergen] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany.
[Troe, Juergen] Max Planck Inst Biophys Chem, D-37077 Gottingen, Germany.
RP Viggiano, AA (reprint author), Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
EM Albert.Viggiano@kirtland.af.mil
RI Li, Jun/H-4980-2013; Guo, Hua/J-2685-2014
OI Li, Jun/0000-0003-2392-8322; Guo, Hua/0000-0001-9901-053X
FU Air Force Office of Scientific Research [AFOSR-2303EP]; National
Research Council; Air Force Research Laboratory through the Space
Scholars Program; Department of Defense through a National Defense
Science and Engineering Graduate Fellowship; EOARD [FA8655-11-1-3077];
Department of Energy [DE-FG02-05ER15694]
FX N.S.S. and A. A. V. are grateful for the support of the Air Force Office
of Scientific Research for this work under Project AFOSR-2303EP. J.J.M.
and S. G. A. acknowledge the support of the National Research Council.
J.A.F. acknowledges the support of the Air Force Research Laboratory
through the Space Scholars Program, as well as the Department of Defense
for support through a National Defense Science and Engineering Graduate
Fellowship. J.T. acknowledges support from the EOARD Grant Award
FA8655-11-1-3077. J.L. and H. G. acknowledge support from the Department
of Energy (DE-FG02-05ER15694).
NR 59
TC 8
Z9 8
U1 1
U2 41
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1463-9076
J9 PHYS CHEM CHEM PHYS
JI Phys. Chem. Chem. Phys.
PY 2013
VL 15
IS 27
BP 11257
EP 11267
DI 10.1039/c3cp50335f
PG 11
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 166MB
UT WOS:000320557600010
PM 23722386
ER
PT J
AU Vernon, JP
Hrozhyk, UA
Serak, SV
Tondiglia, VP
White, TJ
Tabiryan, NV
Bunning, TJ
AF Vernon, Jonathan P.
Hrozhyk, Uladzimir A.
Serak, Svetlana V.
Tondiglia, Vincent P.
White, Timothy J.
Tabiryan, Nelson V.
Bunning, Timothy J.
TI Optically Reconfigurable Reflective/Scattering States Enabled with
Photosensitive Cholesteric Liquid Crystal Cells
SO ADVANCED OPTICAL MATERIALS
LA English
DT Article
ID COMMAND SURFACES; ALIGNMENT; PHOTOALIGNMENT; POLYIMIDE; LIGHT;
ORIENTATION; POLYMER; BLENDS
AB Circularly polarized light is employed to write information into cholesteric liquid crystal (CLC) cells that initially exhibit homogeneous planar alignment and are fabricated with a photoaligning boundary layer. Overlap of the writing beam with light reflected from the CLC phase disrupts the reflective Grand-jean texture, resulting in a localized region that strongly scatters light. These scattering areas can be geometrically patterned using circularly polarized light and a mask, erased and brought back to the original reflective condition by exposure to linearly polarized light, and then repatterned with a different mask using circularly polarized light. The light-induced scattering is localized to the side of the cell being exposed. Within the scattering region a microscopic texture is formed, which exhibits an average feature, or "domain", size related to cell thickness and helical pitch. The behavior occurs only when the CLC and incoming writing radiation exhibit the same handedness and when the reflection bandwidth of the CLC is commensurate with the wavelength of the incoming radiation. This new phenomena provides the ability to reconfigure reflectivity from a CLC cell and is expected to be useful for systems where all optical control of dynamic information is needed.
C1 [Vernon, Jonathan P.; Tondiglia, Vincent P.; White, Timothy J.; Bunning, Timothy J.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Vernon, Jonathan P.] Azimuth Corp, Dayton, OH 45432 USA.
[Hrozhyk, Uladzimir A.; Serak, Svetlana V.; Tabiryan, Nelson V.] Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
[Tondiglia, Vincent P.] SAIC Inc, Dayton, OH 45431 USA.
RP Bunning, TJ (reprint author), Air Force Res Lab, 3005 Hobson Way,Suite 1, Wright Patterson AFB, OH 45433 USA.
EM timothy.bunning@wpafb.af.mil
RI White, Timothy/D-4392-2012
FU Air Force Office of Scientific Research; Materials and Manufacturing
Directorate of the Air Force Research Laboratory; DoD SBIR program
FX This work was funded by the Air Force Office of Scientific Research, the
Materials and Manufacturing Directorate of the Air Force Research
Laboratory, and the DoD SBIR program. CLC schematic adapted from work
provided by Michael E. McConney.
NR 28
TC 4
Z9 4
U1 1
U2 34
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY
SN 2195-1071
J9 ADV OPT MATER
JI Adv. Opt. Mater.
PD JAN
PY 2013
VL 1
IS 1
BP 84
EP 91
DI 10.1002/adom.201200014
PG 8
WC Materials Science, Multidisciplinary; Optics
SC Materials Science; Optics
GA 172IZ
UT WOS:000320997600010
ER
PT S
AU Boakye, EE
Keller, KA
Mogilevsky, PS
Parthasarathy, TA
Ahrens, MA
Hay, RS
Cinibulk, MK
AF Boakye, Emmanuel E.
Keller, Kristin A.
Mogilevsky, Pavel S.
Parthasarathy, Triplicane A.
Ahrens, Mark A.
Hay, Randall S.
Cinibulk, Michael K.
BE Singh, D
Salem, J
Halbig, M
Mathur, S
TI PROCESSING AND TESTING RE2SI2O7 MATRIX COMPOSITES
SO MECHANICAL PROPERTIES AND PERFORMANCE OF ENGINEERING CERAMICS AND
COMPOSITES VII
SE Ceramic Engineering and Science Proceedings
LA English
DT Proceedings Paper
CT Mechanical Behavior and Performance of Ceramics and Composites Symposium
CY JAN 22-27, 2012
CL Daytona Beach, FL
SP Amer Ceram Soc (ACerS), Amer Ceram Soc (ACerS), Engn Ceram Div (ECD)
ID LOW-TEMPERATURE SYNTHESIS; YTTRIUM DISILICATE; MONAZITE COATINGS;
MECHANICAL-PROPERTIES; CERAMIC COMPOSITES; GAMMA-Y2SI2O7; STABILITY;
POLYMORPHISM; STRENGTH; Y2SI2O7
AB In prior work, the synthesis of alpha, beta and gamma-Re2Si2O7 powders (Re = Y and Ho) at temperatures from 1000 degrees to 1400 degrees C in air was reported, along with the Vickers hardness of dense gamma-Y2Si2O7 and gamma-Ho2Si2O7 polymorphs. Dense gamma-Y2Si2O7 and gamma-Ho2Si2O7 pellets were made by a pressureless sintering technique at 1400 degrees C / 8 h. Using the pressureless sintering technique, densification of alpha-and beta-Y2Si2O7 powder compacts at their phase formation temperature (1000 degrees -1200 degrees C) was not successful and prevented the determination of their hardness. In this work, the field assisted sintering technique (FAST) was used to form dense alpha-, beta- and gamma-Y2Si2O7 pellets at a pressure of 20 kN and temperatures of 1050 degrees -1200 degrees C. Subsequently, their Vickers hardness was measured. SCS-0 fibers were also incorporated into alpha- , beta-and gamma-Y2Si2O7 matrixes and densified at 1050 degrees C -1200 degrees C / 1 h using the FAST approach. Fiber push-out experiments were conducted, and the average sliding stress values were determined.
C1 [Boakye, Emmanuel E.; Keller, Kristin A.; Mogilevsky, Pavel S.; Parthasarathy, Triplicane A.; Ahrens, Mark A.; Hay, Randall S.; Cinibulk, Michael K.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
RP Boakye, EE (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
NR 29
TC 1
Z9 1
U1 2
U2 5
PU AMER CERAMIC SOC
PI WESTERVILLE
PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA
SN 0196-6219
BN 978-1-118-21746-7; 978-1-118-20588-4
J9 CERAM ENG SCI PROC
PY 2013
BP 233
EP 242
PG 10
WC Materials Science, Ceramics
SC Materials Science
GA BFH88
UT WOS:000319911600023
ER
PT S
AU Hay, RS
Fair, GE
Hart, A
Potticary, S
Bouffioux, R
AF Hay, R. S.
Fair, G. E.
Hart, A.
Potticary, S.
Bouffioux, R.
BE Singh, D
Salem, J
Halbig, M
Mathur, S
TI KINETICS OF PASSIVE OXIDATION OF HI-NICALON-S SiC FIBERS IN WET AIR:
RELATIONSHIPS BETWEEN SiO2 SCALE THICKNESS, CRYSTALLIZATION, AND FIBER
STRENGTH
SO MECHANICAL PROPERTIES AND PERFORMANCE OF ENGINEERING CERAMICS AND
COMPOSITES VII
SE Ceramic Engineering and Science Proceedings
LA English
DT Proceedings Paper
CT Mechanical Behavior and Performance of Ceramics and Composites Symposium
CY JAN 22-27, 2012
CL Daytona Beach, FL
SP Amer Ceram Soc (ACerS), Amer Ceram Soc (ACerS), Engn Ceram Div (ECD)
ID SILICON-CARBIDE FIBERS; LOW-OXYGEN CONTENT; THERMAL-OXIDATION;
WATER-VAPOR; TENSILE-STRENGTH; BEHAVIOR; STRESS; TRANSFORMATION;
COMPOSITES; ATMOSPHERE
AB The strengths of Hi-Nicalon(TM)-S SiC fibers were measured after oxidation in wet air between 700 and 1300 C. The oxidation and scale crystallization kinetics were also measured. Thicknesses of amorphous and crystalline scale were measured by TEM. Oxidation initially produces an amorphous scale that starts to crystallize to cristobalite and tridymite in 100 hours at 1000 C or in one hour at 1300 C. Crystallization kinetics for oxidation in wet air were slightly slower than those for dry air. The activation energy of 249kJ/mol for parabolic oxidation to uncrystallized SiO2 scale in wet air was indistinguishable from that for dry air oxidation, but the pre-exponential factor was similar to 2x higher. SiC fiber strength changes with oxidation in dry and wet air were very similar. The fiber strength increased by approximately 10% for SiO2 scale thickness up to similar to 100 nm, and decreased for thicker scales. No significant strength degradation was observed for amorphous scales. All fibers with significantly degraded strength had crystallized or partially crystallized scales.
C1 [Hay, R. S.; Fair, G. E.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
[Hart, A.; Potticary, S.] Univ Cincinnati, Cincinnati, OH USA.
[Bouffioux, R.] New Mexico Tech Univ, Socorro, NM USA.
RP Hay, RS (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
NR 53
TC 1
Z9 1
U1 1
U2 11
PU AMER CERAMIC SOC
PI WESTERVILLE
PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA
SN 0196-6219
BN 978-1-118-21746-7; 978-1-118-20588-4
J9 CERAM ENG SCI PROC
PY 2013
BP 253
EP 260
PG 8
WC Materials Science, Ceramics
SC Materials Science
GA BFH88
UT WOS:000319911600025
ER
PT J
AU Corner, B
Reed, M
Hudson, J
Zehner, G
AF Corner, Brian
Reed, Matt
Hudson, Jeff
Zehner, Greg
TI Use of geometric data in human factors and ergonomic applications.
SO AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY
LA English
DT Meeting Abstract
CT 82nd Annual Meeting of the
American-Association-of-Physical-Anthropologists
CY APR 09-13, 2013
CL Knoxville, TN
SP Amer Assoc Phys Anthropologists
C1 [Corner, Brian] USA, Natick Soldier RDEC, Washington, DC USA.
[Reed, Matt] Univ Michigan, Transportat Res Inst, Ann Arbor, MI 48109 USA.
[Zehner, Greg] USAF, Res Lab, Wright Patterson AFB, OH USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0002-9483
J9 AM J PHYS ANTHROPOL
JI Am. J. Phys. Anthropol.
PY 2013
VL 150
SU 56
SI SI
BP 103
EP 103
PG 1
WC Anthropology; Evolutionary Biology
SC Anthropology; Evolutionary Biology
GA 132BR
UT WOS:000318043201169
ER
PT B
AU Levicoff, E
Porat, M
Klatt, BA
AF Levicoff, Eric
Porat, Manny
Klatt, Brian A.
BA Parvizi, J
Klatt, BA
BF Parvizi, J
Klatt, BA
TI OPERATING ROOM SETUP
SO ESSENTIALS IN TOTAL HIP ARTHROPLASTY
LA English
DT Article; Book Chapter
ID TOTAL HIP-ARTHROPLASTY; SURGICAL-SITE INFECTIONS; TOTAL JOINT
ARTHROPLASTY; QUALITY-OF-LIFE; POSTOPERATIVE INFECTION;
ORTHOPEDIC-SURGERY; KNEE ARTHROPLASTY; SKIN PREPARATION; CONTAMINATION;
REPLACEMENT
C1 [Levicoff, Eric] Univ Pittsburgh, Med Ctr, Dept Orthoped Surg, Pittsburgh, PA 15260 USA.
[Porat, Manny] Thomas Jefferson Univ, Dept Orthoped Surg, Philadelphia, PA 19107 USA.
[Klatt, Brian A.] USAF, Wright Patterson AFB, OH USA.
RP Levicoff, E (reprint author), Univ Pittsburgh, Med Ctr, Dept Orthoped Surg, Pittsburgh, PA 15260 USA.
NR 36
TC 0
Z9 0
U1 0
U2 0
PU SLACK INC
PI THOROFARE
PA 6900 GROVE ROAD, THOROFARE, NJ 08086-9447 USA
BN 978-1-55642-870-8
PY 2013
BP 133
EP 138
PG 6
WC Orthopedics
SC Orthopedics
GA BFF94
UT WOS:000319708000016
ER
PT B
AU Ghanem, E
Parvizi, J
Klatt, BA
AF Ghanem, Elie
Parvizi, Javad
Klatt, Brian A.
BA Parvizi, J
Klatt, BA
BF Parvizi, J
Klatt, BA
TI IMPLANTS
SO ESSENTIALS IN TOTAL HIP ARTHROPLASTY
LA English
DT Article; Book Chapter
ID TOTAL HIP-ARTHROPLASTY; METAL-ON-METAL; 5-YEAR FOLLOW-UP; ACETABULAR
COMPONENTS; FEMORAL COMPONENT; CEMENTLESS; POLYETHYLENE; REPLACEMENT;
FIXATION; 10-YEAR
C1 [Ghanem, Elie] New England Baptist Hosp, Dept Orthoped, Boston, MA USA.
[Parvizi, Javad] Rothman Inst, Philadelphia, PA USA.
[Parvizi, Javad] Thomas Jefferson Univ, Philadelphia, PA USA.
[Klatt, Brian A.] USAF, Wright Patterson AFB, OH USA.
[Klatt, Brian A.] Wilford Hall USAF Med Ctr, Residency Program, Lackland AFB, TX USA.
RP Ghanem, E (reprint author), New England Baptist Hosp, Dept Orthoped, Boston, MA USA.
NR 38
TC 0
Z9 0
U1 0
U2 0
PU SLACK INC
PI THOROFARE
PA 6900 GROVE ROAD, THOROFARE, NJ 08086-9447 USA
BN 978-1-55642-870-8
PY 2013
BP 139
EP 146
PG 8
WC Orthopedics
SC Orthopedics
GA BFF94
UT WOS:000319708000017
ER
EF