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  • ASTROPHYSICS  (6)
  • SOLID-STATE PHYSICS  (3)
  • 2020-2022
  • 2005-2009
  • 1990-1994  (9)
  • 1990  (9)
  • 1
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Data base on physical observations of near-Earth asteroids and establishment of a network to coordinate observations of newly discovered near-Earth asteroids (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This program consists of two tasks: (1) development of a data base of physical observations of near-earth asteroids and establishment of a network to coordinate observations of newly discovered earth-approaching asteroids; and (2) a simulation of the surface of low-activity comets. Significant progress was made on task one and, and task two was completed during the period covered by this progress report.
    Keywords: ASTROPHYSICS
    Type: NASA Space Engineering Research Center for Utilization of Local Planetary Resources; 2 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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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
  • 4
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    Silicon carbide semiconductor device fabrication and characterization (1990)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A number of basic building blocks i.e., rectifying and ohmic contacts, implanted junctions, MOS capacitors, pnpn diodes and devices, such as, MESFETs on both alpha and beta SiC films were fabricated and characterized. Gold forms a rectifying contact on beta SiC. Since Au contacts degrade at high temperatures, these are not considered to be suitable for high temperature device applications. However, it was possible to utilize Au contact diodes for electrically characterizing SiC films. Preliminary work indicates that sputtered Pt or Pt/Si contacts on beta SiC films are someways superior to Au contacts. Sputtered Pt layers on alpha SiC films form excellent rectifying contacts, whereas Ni layers following anneal at approximately 1050 C provide an ohmic contact. It has demonstrated that ion implantation of Al in substrates held at 550 C can be successfully employed for the fabrication of rectifying junction diodes. Feasibility of fabricating pnpn diodes and platinum gated MESFETs on alpha SiC films was also demonstrated.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-CR-186354 , NAS 1.26:186354 , AD-A231299
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A redshift survey of IRAS galaxies. I - Sample selection (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A complete all-sky sample of objects, flux-limited at 60 microns, has been extracted from the data base of the IRAS. The sample consists of 5014 objects, of which 2649 are galaxies and 13 are not yet identified. In order to study large-scale structure with this sample, it must be free of systematic biases. Corrections are applied for a major systematic effect in the flux densities listed in the IRAS Point Source Catalog: sources resolved by the IRAS beam have flux densities systematically underestimated. In addition, accurate flux densities are obtained for sources flagged as variable, or of moderate flux quality at 60 microns. The IRAS detectors suffered radiation-induced responsivity enhancement (hysteresis) due to crossings of the satellite scans across the Galactic plane; this effect is measured and is shown to be negligible.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 361; 49-62
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    NASA TECHNICAL REPORTS
  • 6
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    Dynamic spectra of radio bursts from flare stars (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Arecibo 305 m telescope has been used to observe radio bursts from flare stars at 430 and 1415 MHz. Dynamic spectra of the emission with bandwidths of 10 MHz in the former case and 40 MHz in the latter are recorded. For AD Leo, the microwave burst emission was 100 percent right circularly polarized, achieved brightness temperatures near 10 to the 16th K, was generally broadband in character, but was superposed with finite structures in both frequency and time. Quasi-periodic pulsations were clearly present as well as a sudden reduction feature. For YZ CMi, the emission was 100 percent left circularly polarized and was relatively broadband with fine structures. Instabilities driven by anisotropies in the electron distribution, particularly the loss-cone distribution, are considered to account for the coherent radiation.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 353; 265-273
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    NASA TECHNICAL REPORTS
  • 7
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    Ultraviolet spectra of field horizontal-branch A-type stars. II (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The spectra of six additional A-type stars have been obtained at low resolution between 1200 and 1900 A with the IUE. The energy distributions of four of the stars match that of the field horizontal branch (FHB) distribution in Huenemoerder et al. (1984) while those of the other two do not. Three of the FHB stars fall above a line in the C(19 - V)0 vs. (b-y)0 diagram; however, HD 60825 is anomalously blue for its C(19 - V) color.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 102; 649-651
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Multizone accretional evolution of planetesimal swarms (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The general features of a new numerical simulation of planetesimal accretion which models multiple heliocentric distance zones, together with a detailed model for the planetesimal size and orbital distribution in each zone, are described. A restricted version of this model which allows only a single heliocentric distance zone has been used to test the validity of the code by comparing with results from earlier authors when the same physical phenomena are included. Generally, very good agreement is found.
    Keywords: ASTROPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 10; 4-Mar
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    NASA TECHNICAL REPORTS
  • 9
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    Elemental abundances of the mercury-manganese stars HR 4817 and Chi Lupi (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Fine analyses of limited spectral regions of the mercury-manganese stars HR 4817 and Chi Lup confirm that these stars have abundances of typical class members. The best determined values of HR 4817 are similar to those of 53 Tau which is an anomalous class member.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 238; 2-Jan
    Format: text
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