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  • Other Sources  (173)
  • ENERGY PRODUCTION AND CONVERSION  (133)
  • INSTRUMENTATION AND PHOTOGRAPHY  (40)
  • Analytical Chemistry and Spectroscopy
  • 1980-1984  (173)
  • 1981  (173)
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  • 1980-1984  (173)
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  • 11
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    Echelle spectroscopy with a charge-coupled device /CCD/ (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The recent availability of large format CCD's with high quantum efficiency makes it possible to achieve significant advances in high dispersion astronomical spectroscopy. An echelle CCD combination excels or equals other techniques presently available, and offers the advantage of complete spectral coverage of several thousand Angstroms in a single exposure. Attention is given to experiments which were conducted with a CCD camera head and an echelle spectrograph on a 4-meter telescope. It was found possible to achieve a signal-to-noise ratio of 150/1 on a 13th magnitude star at 6000 A in a two-hour exposure at 0.16 A/pixel, limited primarily by photon statistics. For fainter objects, readout noise is the limiting factor in precision. For 20 electron rms readout noise, an S/N = 15/1 at 18th magnitude is expected, all other things being equal.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Solid state imagers for astronomy; June 10, 11, 1981; Cambridge, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Silicon-on ceramic process: Silicon sheet growth and device development for the large-area silicon sheet task of the low-cost solar array project (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The technical feasibility of producing solar-cell-quality sheet silicon to meet the Department of Energy (DOE) 1986 overall price goal of $0.70/watt was investigated. With the silicon-on-ceramic (SOC) approach, a low-cost ceramic substrate is coated with large-grain polycrystalline silicon by unidirectional solidification of molten silicon. This effort was divided into several areas of investigation in order to most efficiently meet the goals of the program. These areas include: (1) dip-coating; (2) continuous coating designated SCIM-coating, and acronym for Silicon Coating by an Inverted Meniscus (SCIM); (3) material characterization; (4) cell fabrication and evaluation; and (5) theoretical analysis. Both coating approaches were successful in producing thin layers of large grain, solar-cell-quality silicon. The dip-coating approach was initially investigated and considerable effort was given to this technique. The SCIM technique was adopted because of its scale-up potential and its capability to produce more conventiently large areas of SOC.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-163476 , DOE/JPL-954356-80/15 , JPL-9950-617
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    Large-area silicon-on-ceramic substrates for low-cost solar cells (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The SCIM (Silicon-Coating-By-Inverted Meniscus) process to produce SOC (silicon-on-ceramic) substrates has been investigated for various growth conditions and substrate velocities (4-30 cm/min). Slotted mullite-based substrates (10-cm-wide by 100-cm-long) have been coated with smooth, continuous silicon layers, with thicknesses in the range from 100 to 300 microns. Thermal stress (which can be a problem at low velocities) is prevented by proper thermal design. The highest SCIM-coated SOC cell efficiencies to date are 7.5% (AM1, AR) as compared to 10.5% (AM1, AR) for dip-coated SOC cells. Substantial improvements in cell efficiency are expected when high purity parts are installed in the SCIM-coater.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; May 12, 1981 - May 15, 1981; Kissimmee, FL
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    NASA TECHNICAL REPORTS
  • 14
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    Silicon-on-ceramic process: Silicon sheet growth and device development for the large-area silicon sheet task of the low-cost solar array project (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The technical feasibility of producing solar cell quality sheet silicon to meet the DOE 1986 cost goal of 70 cents/watt was investigated. The silicon on ceramic approach is to coat a low cost ceramic substrate with large grain polycrystalline silicon by unidirectional solidification of molten silicon. Results and accomplishments are summarized.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-164134 , DOE/JPL-954356-80/14 , JPL-9950-495 , AR-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 15
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    Electromagnetic studies of redox systems for energy storage (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Both chromium and iron couples were studied on various electrode surfaces in acidic perchlorate solution by using rotating ring-disk techniques. It was found that chloride which forms inner sphere coordination complexes with the redox species enhances the electrode kinetics dramatically. The effects of lead underpotential deposition and surface alloy formation on the kinetics of the chromium couple on gold were studied using both linear sweep voltammetry and potential step techniques. The lad underpotential deposition was found to slow down the kinetics of the reduction of the Cr species on gold surfaces although increase the hydrogen overvoltage. The effect on the chromium kinetics can be explained in terms of principally a double layer effect. The underpotential deposition lead species with its positive charge results in a decrease in the concentration of the Cr species at the electrode surface. Similar phenomena were also observed with bismuth underpotential deposition on gold for the iron couple.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-169593 , NAS 1.26:169593 , REPT-2
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    NASA TECHNICAL REPORTS
  • 16
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    Gas-turbine critical research and advanced technology support project (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A technology data base for utility gas turbine systems capable of burning coal derived fuels was developed. The following areas are investigated: combustion; materials; and system studies. A two stage test rig is designed to study the conversion of fuel bound nitrogen to NOx. The feasibility of using heavy fuels in catalytic combustors is evaluated. A statistically designed series of hot corrosion burner rig tests was conducted to measure the corrosion rates of typical gas turbine alloys with several fuel contaminants. Fuel additives and several advanced thermal barrier coatings are tested. Thermal barrier coatings used in conjunction with low critical alloys and those used in a combined cycle system in which the stack temperature was maintained above the acid corrosion temperature are also studied.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-81708 , DOE/NASA/2593-24 , E-737
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 17
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    Ion implantation of solar cell junctions without mass analysis (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper is a summary of an investigation to determine the feasibility of producing solar cells by means of ion implantation without the use of mass analysis. Ion implants were performed using molecular and atomic phosphorus produced by the vaporization of solid red phosphorus and ionized in an electron bombardment source. Solar cell junctions were ion implanted by mass analysis of individual molecular species and by direct unanalyzed implants from the ion source. The implant dose ranged from 10 to the 14th to 10 to the 16th atoms/sq cm and the energy per implanted atom ranged from 5 KeV to 40 KeV in this study.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Symposium on Materials and New Processing Technologies for Photovoltaics; Oct 01, 1980; Hollywood, FL
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    NASA TECHNICAL REPORTS
  • 18
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    Comparison of upwind and downwind rotor operations of the DOE/NASA 100-kW Mod-O wind turbine (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Three aspects of the test results are compared: rotor blade bending loads, rotor teeter response, and nacelle yaw moments. As a result of the tests, it is shown that while mean flatwise bending moments were unaffected by the placement of the rotor, cyclic flatwise bending tended to increase with wind speed for the downwind rotor while remaining somewhat uniform with wind speed for the upwind rotor, reflecting the effects of increased flow disturbance for a downwind rotor. Rotor teeter response was not significantly affected by the rotor location relative to the tower, but appears to reflect reduced teeter stability near rated wind speed for both configurations. Teeter stability appears to return above wind speed, however. Nacelle yaw moments are higher for the upwind rotor but do not indicate significant design problems for either configuration.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-81744 , E-798 , DOE/NASA/1028-31 , DOE/NASA Wind Turbine Dyn. Workshop,; Feb 24, 1981 - Feb 26, 1981; Cleveland, OH; United States
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    NASA TECHNICAL REPORTS
  • 19
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    Application of a laser interferometer skin-friction meter in complex flows (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The application of a nonintrusive laser-interferometer skin-friction meter, which measures skin friction with a remotely located laser interferometer that monitors the thickness change of a thin oil film, is extended both experimentally and theoretically to several complex wind-tunnel flows. These include two-dimensional seperated and reattached subsonic flows with large pressure and shear gradients, and two and three-dimensional supersonic flows at high Reynolds number, which include variable wall temperatures and cross-flows. In addition, it is found that the instrument can provide an accurate location of the mean reattachment length for separated flows. Results show that levels up to 120 N/sq m, or 40 times higher than previous tests, can be obtained, despite encountering some limits to the method for very high skin-friction levels. It is concluded that these results establish the utility of this instrument for measuring skin friction in a wide variety of flows of interest in aerodynamic testing.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ICIASF ''81; International Congress on Instrumentation in Aerospace Simulation Facilities; Sep 30, 1981; Dayton, OH
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    NASA TECHNICAL REPORTS
  • 20
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    Contribution to CCN Workshop report from University of Wyoming group (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The group's CCN counter is described. It is a static, horizontal, parallel plate thermal gradient diffusion chamber. Examples of the application of the CCN are presented and include the CCN spectra measured during the winter of 1978-79 near Elk Mountain, Wyoming. Comparisons of droplet concentrations derived from upwind CCN spectra are covered.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Desert Research Inst. The Third Intern. Cloud Condensation Nuclei Workshop; p 11-13
    Format: text
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    NASA TECHNICAL REPORTS
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