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2,831 to 2,840 of 2,866 Results
Chandra X-ray observations of young clusters : II. Orion Flanking Fields Data
Aug 1, 2004
Ramírez, Solange V.; Rebull, Luisa; Stauffer, John; Strom, Stephen; Hillenbrand, Lynne; Hearty, Thomas; Kopan, Eugene L.; Pravdo, Steven; Makidon, Russell; Jones, Burton, 2004, "Chandra X-ray observations of young clusters : II. Orion Flanking Fields Data", https://hdl.handle.net/2014/40848, The Astronomical Journal 128, 787-804, August 2004, doi: 10.1086/422349, JPL Open Repository
We present results of Chandra observations of two flanking fields (FFs) in Orion, outside the Orion Nebula Cluster (ONC). The observations were taken with the ACIS-I camera with an exposure time of about 48 ks each field. We present a catalog of 417 sources, which includes X-ray...
Dynamic SDRAM SEFI detection and recovery test results.
Jul 22, 2004
Guertin, Steven M.; Patterson, Jeffrey D.; Nguyen, Duc N., 2004, "Dynamic SDRAM SEFI detection and recovery test results.", https://hdl.handle.net/2014/41278, Radiation Effects Data Workshop, 2004 IEEE, 22-22 July 2004, pg 62-67, doi: 10.1109/REDW.2004.1352906, JPL Open Repository
Single event functionality interrupt (SEFI) results are presented for Hynix SDRAMS. The SEFI response threshold is below LET 9.9 Mev-cm/sup 2//mg and the saturated cross section is 6/spl times/10/sup -5/cm/sup 2/. Dynamic SEFI identification was made, and in-situ recovery restore...
Temperature distributions in hollow cathode emitters
Jul 11, 2004
Polk, Jay; Marrese, Colleen; Thornber, Ben; Dang, Lisa; Johnson, Lee, 2004, "Temperature distributions in hollow cathode emitters", https://hdl.handle.net/2014/41813, 2004 Joint Propulsion Conference, Fort Lauderdale, FL, July 11-14,2004., JPL Open Repository
Life-limiting processes in hollow cathodes are determined largely by the temperature of the emitter. To support development of cathode life models we have developed a noncontact temperature measurement technique which employs a stepper motor-driven fiber optic probe. The probe is...
Taking evolutionary circuit design from experimentation to implementation: some useful techniques and a silicon demonstration
Jul 4, 2004
Stoica, A.; Zebulum, R. S.; Guo, X.; Keymeulen, D.; Ferguson, M. I.; Duong, V., 2004, "Taking evolutionary circuit design from experimentation to implementation: some useful techniques and a silicon demonstration", https://hdl.handle.net/2014/39285, IEE Proc.-Comput. Digit. Tech., Vol. 151, No. 4, July 2004 doi: 10.1049/ip-cdt:20040503, JPL Open Repository
Current techniques in evolutionary synthesis of analogue and digital circuits designed at transistor level have focused on achieving the desired functional response, without paying sufficient attention to issues needed for a practical implementation of the resulting solution. No...
Disordered zinc in Zn4Sb3 with phonon-glass and electron-crystal thermoelectric properties
Jul 1, 2004
Snyder, G. Jeffrey; Christensen, Mogens; Nishibori, Eiji; Caillat, Thierry; Brummerstedt Iversen, Bo, 2004, "Disordered zinc in Zn4Sb3 with phonon-glass and electron-crystal thermoelectric properties", https://hdl.handle.net/2014/40843, NATURE MATERIALS Vol. 3, Iss. 7, pp 458-463, 2004, doi.org/10.1038/nmat1154, JPL Open Repository
By converting waste heat into electricity, thermoelectric generators could be an important part of the solution to today's energy challenges. The compound Zn4Sb3 is one of the most efficient thermoelectric materials known. Its high efficiency results from an extraordinarily low t...
Mesoscale gravity wave variances from AMSU-A radiances
Jun 29, 2004
Wu, Dong L., 2004, "Mesoscale gravity wave variances from AMSU-A radiances", https://hdl.handle.net/2014/40861, Geophysical Research Letters, Vol. 31, L12114, doi:10.1029/2004GL019562, 2004, JPL Open Repository
A variance analysis technique is developed here to extract gravity wave (GW) induced temperature fluctuations from NOAA AMSU-A (Advanced Microwave Sounding Unit-A) radiance measurements. By carefully removing the instrument/measurement noise, the algorithm can produce reliable GW...
MISR Calibration and implications for low-light-level aerosol retrieval over dark water.
Jun 29, 2004
Kahn, Ralph; Ku, Wen-Hao; Martonchik, John; Bruegge, Carol J; Diner, David J.; Gaitley, Barbara J.; Abdou, Wedad; Dubovik, Oleg; Holben, Brent; Smirnov, Alexander; Jin, Zhonghai; Clark, Dennis, 2004, "MISR Calibration and implications for low-light-level aerosol retrieval over dark water.", https://hdl.handle.net/2014/39257, Journal of the Atmospheric Sciences - Special Section, Vol. 62, 1032-1052., JPL Open Repository
The authors push the limits of the vicarious calibration method’s accuracy, aiming to assess absolute, camera-to-camera, and band-toband radiometry. Patterns repeated over many well-constrained cases lend confidence to the results, at a few percent accuracy, as do additional vica...
Current state of modeling the photochemistry of Titan’s mutually dependent atmosphere and ionosphere
Jun 4, 2004
Wilson, Eric H.; Atreya, S. K., 2004, "Current state of modeling the photochemistry of Titan’s mutually dependent atmosphere and ionosphere", https://hdl.handle.net/2014/40873, Journal of Geophysical Research, Vol. 109, E06002, doi:10.1029/2003JE002181, 2004, JPL Open Repository
In the context of recent observations, microphysical models, and laboratory data, a photochemical model of Titan’s atmosphere, including updated chemistry focusing on rate coefficients and cross sections measured under appropriate conditions, has been developed to increase unders...
Evolutionary multiobjective design targeting a field programmable transistor array
Jun 1, 2004
Aguirre, Arturo Hernandez; Zebulum, Ricardo S.; Coello, Carlos Coello, 2004, "Evolutionary multiobjective design targeting a field programmable transistor array", https://hdl.handle.net/2014/40941, 2004 NASA/DoD Conference on Evolvable Hardware (EH'04), http://doi.ieeecomputersociety.org/10.1109/EH.2004.1310831, JPL Open Repository
This paper introduces the ISPAES algorithm for circuit design targeting a Field Programmable Transistor Array (FPTA). The use of evolutionary algorithms is common in circuit design problems, where a single fitness function drives the evolution process. Frequently, the design prob...
Forest attributes from radar interferometric structure and its fusion with optical remote sensing
Jun 1, 2004
Treuhaft, Robert N.; Law, Beverly E.; Asner, Gregory P., 2004, "Forest attributes from radar interferometric structure and its fusion with optical remote sensing", https://hdl.handle.net/2014/40842, BioScience, Vol. 54 No. 6, June 2004, doi: 10.1641/0006-3568(2004)054, JPL Open Repository
The possibility of global, three-dimensional remote sensing of forest structure with interferometric synthetic aperture radar (InSAR) bears on important forest ecological processes, particularly the carbon cycle. InSAR supplements two-dimensional remote sensing with information i...
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