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  • Other Sources  (51)
  • SPACE TRANSPORTATION  (31)
  • METEOROLOGY AND CLIMATOLOGY  (10)
  • SOLID-STATE PHYSICS  (10)
  • 1990-1994  (51)
  • 1
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    Ballistic-carrier spectroscopy of the CoSi2/Si interface (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Ballistic-electron-emission microscopy and related ballistic-hole and carrier-scattering spectroscopies were used to investigate carrier transport in the epitaxial CoSi2/Si system. An unexpected degree of variation in interface transmission was observed despite the high crystal quality of the epitaxial silicide layer. Furthermore, clear evidence of the CoSi2 band structure was observed, which has a dramatic effect on interface transport. The major effect of the silicide band structure is to increase the interfacial barrier to electron transmission to a value in excess of the Schottky barrier height.
    Keywords: SOLID-STATE PHYSICS
    Type: Physical Review B - Condensed Matter, 3rd Series (ISSN 0163-1829); 44; 6546-654
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  • 2
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    Direct spectroscopy of electron and hole scattering (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A new spectroscopy has been developed for the first direct probe of carrier-carrier scattering in materials. This spectroscopy provides spatial and energy resolution of the scattering process and has been used to investigate transport, scattering phenomena, and hot-carrier creation in two important metal-semiconductor systems. A theoretical treatment of this scattering spectroscopy yields excellent agreement with experimental spectra and provides direct evidence that carrier-carrier scattering is a dominant energy-loss mechanism in hot-carrier transport.
    Keywords: SOLID-STATE PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 64; 2679-268
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  • 3
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    Pulsatile instability in rapid directional solidification: Strongly-nonlinear analysis (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: In models of rapid directional solidification, non-equilibrium interfacial conditions are employed. As a result, there is an oscillatory mode of instability, as well as the steady cellular mode, found in the equilibrium model of Mullins and Sekerka. When the temperature field is decoupled from the problem, the preferred wave number for the oscillatory mode is zero, and the interface pulsates in time while remaining spatially uniform. Results from multiple scale analyses in the two limiting cases of the parameters are reported. In these limits, it is found that the instability is a bifurcation to relaxation oscillations; these nonlinear oscillations may be related to the observed microstructure that results from rapid solidification processes such as laser surface remelting.
    Keywords: SOLID-STATE PHYSICS
    Type: ESA, Proceedings of the 8th European Symposium on Materials and Fluid Sciences in Microgravity, Volume 2; p 559-562
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    NASA TECHNICAL REPORTS
  • 4
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    Debris/Ice/TPS Assessment and Photographic Analysis for Shuttle Mission STS-38 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A debris/ice/TPS assessment and photographic analysis was conducted for the Space Shuttle Mission STS-38. Debris inspection of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the external tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. The debris/ice/TPS conditions and photographic analysis of Mission STS-38, and their overall effect on the Space Shuttle Program are documented.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103815 , NAS 1.15:103815
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    NASA TECHNICAL REPORTS
  • 5
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    Debris/Ice/TPS Assessment and Photographic Analysis for Shuttle Mission STS-41 (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Debris/Ice/Thermal Protection System (TPS) assessment and photographic analysis was conducted for Space Shuttle Mission STS-41. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the External Tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. Documented here are the debris/ice/TPS conditions and photographic analysis of Mission STS-41, and their overall effect on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103814 , NAS 1.15:103814
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  • 6
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    Debris/ice/TPS assessment and integrated photographic analysis for Shuttle Mission STS-46 (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Debris/Ice/TPS assessment and integrated photographic analysis was conducted for Shuttle Mission STS-46. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the External Tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. This report documents the debris/ice/TPS conditions and integrated photographic analysis of Shuttle Mission STS-46, and the resulting effect on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-107552 , NAS 1.15:107552
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    NASA TECHNICAL REPORTS
  • 7
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    Dependence of millimeter wave surface resistance on the deposition parameters of laser ablated YBa2Cu3O(x) thin films (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Measurements of millimeter-wave surface resistance versus temperature have been performed for YBa2Cu3O(x) thin films on 100 line-type SrTiO(3) substrates using a TE(011) cylindrical copper cavity at 80 GHz. The 0.6-micron thick films were grown at several deposition temperatures in the range 690 C to 810 C by means of a pulsed excimer laser ablation technique. A surface resistance minimum (60 milliohm at 77 K) near 770 C is shown to correlate with a minimum in c-axis lattice parameter (11.72 A). The highest value of Tc also occurs near this temperature. The surface resistance of films deposited at 790 C on 110 line-type LaAlO3 subtrates is lower, reaching 8 milliohm at 98 GHz and 80 K, demonstrating the influence of substate material on film quality.
    Keywords: SOLID-STATE PHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Debris/ice/TPS assessment and integrated photographic analysis for Shuttle Mission STS-50 (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Thermal Protection System (TPS) assessment and integrated photographic analysis was conducted for Shuttle Mission STS-50. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the external tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. The debris/ice/TPS conditions and integrated photographic analysis of Shuttle Mission STS-50, and the resulting effect on the Space Shuttle Program are documented.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-107550 , NAS 1.15:107550
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  • 9
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    Debris/ice/TPS assessment and integrated photographic analysis for Shuttle Mission STS-45 (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Debris Team has developed and implemented measures to control damage from debris in the Shuttle operational environment and to make the control measures a part of routine launch flows. These measures include engineering surveillance during vehicle processing and closeout operations, facility and flight hardware inspections before and after launch, and photographic analysis of mission events. Photographic analyses of mission imagery from launch, on-orbit, and landing provide significant data in verifying proper operation of systems and evaluating anomalies. In addition to the Kennedy Space Center (KSC) Photo/Video Analysis, reports from Johnson Space Center, Marshall Space Flight Center, and Rockwell International-Downey are also included to provide an integrated assessment of each Shuttle mission.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-107545 , NAS 1.15:107545
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    NASA TECHNICAL REPORTS
  • 10
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    Debris/ice/TPS assessment and photographic analysis for shuttle mission STS-31R (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Debris/Ice/Thermal Protection System (TPS) assessment and photographic analysis was conducted for Space Shuttle Mission STS-31R. Debris inspections of the flight elements and launch pad are performed before and after launch. Ice/frost conditions on the External Tank are assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography is analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. The debris/ice/TPS conditions and photographic analysis of Mission STS-31R, is presented along with their overall effect on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-102790 , NAS 1.15:102790
    Format: application/pdf
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