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  • 1
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    Polarizabilities of highly ionized atoms (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An extrapolation method based on a screening approximation, applied to available initial values of polarizability for low stages of ionization, is used to obtain dipole and quadrupole polarizabilities for more highly ionized members of many isoelectronic sequences. It is suggested that the derived screening constants x sub L and limiting ratios F sub L may have significant physical meaning, especially the latter which may have an interpretation in terms of hydrogenic polarizabilities.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Optical Society of America; vol. 69
    Format: text
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  • 2
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    Research and development of low cost processes for integrated solar arrays (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Si reduction, purification and sheet generation work has been concentrated on gaining information about a reduction process combined with purification (higher purity arc furnace with gas blowing and gradient freezing), transport process with purification and polycrystal sheet growth potential (SiF2), plastic deformation for sheet generation, and float zone sheet recrystallization.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 1st ERDA Semiann. Solar Photovoltaic Conversion Program Conf.; p 172-193
    Format: application/pdf
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  • 3
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    Calibration and performance of the Viking lander cameras (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper discusses Viking lander cameras which have an angular resolution of 0.12 deg, and (for broadband imaging) a resolution of 0.04 deg, used for the acquisition of data in six spectral bands for color and near-infrared imaging. Attention is given to photogrammetric calibration techniques used in the determination of spatial and spectral brightness variations from image data. The effects of sampling on the achievable photogrammetric precision are described along with techniques for preflight spectral calibrations and the corrections required for degradation in the infrared response of the detectors. The effects of the known internal reflections on the qualitative images (such as the appearance of artifact clouds) are presented, noting their effects on skyline radiometry. The qualitative and quantitative effects of the signal quantization are briefly reviewed.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Journal of Geophysical Research; 82; Sept. 30
    Format: text
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  • 4
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    Viking lander camera radiometry calibration report, volume 1 (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The test methods and data reduction techniques used to determine and remove instrumental signatures from Viking Lander camera radiometry data are described. Gain, offset, and calibration constants are presented in tables.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-155537 , JPL-PUB-77-62-VOL-1
    Format: application/pdf
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  • 5
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    Properties of aerosols in the Martian atmosphere, as inferred from Viking Lander imaging data (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Three types of aerosol were detected from observations of the Martian sky, Phobos, and the sun with the Viking imaging cameras. Atmospheric optical depths were derived from observations of the objects' brightness. Data on the absorption coefficient, mean size, and shape of aerosols were obtained from studies of the sky brightness, using a multiple-scattering computer code. The aerosol types were water ice ground fog, a higher-level ice cloud (polar hood), and soil particles suspended at heights up to 30 km. The properties of each type of aerosol are discussed. The data are subjected to thorough analysis, and the results are summarized.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 82; Sept. 30
    Format: text
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  • 6
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    Viking lander camera radiometry calibration report, volume 2 (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The requirements the performance validation, and interfaces for the RADCAM program, to convert Viking lander camera image data to radiometric units were established. A proposed algorithm is described, and an appendix summarizing the planned reduction of camera test data was included.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: JPL-PUB-77-62-VOL-2
    Format: application/pdf
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  • 7
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    Analysis and evaluation in the production process and equipment area of the low-cost solar array project (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The energy consumed in manufacturing silicon solar cell modules was calculated for the current process, as well as for 1982 and 1986 projected processes. In addition, energy payback times for the above three sequences are shown. The module manufacturing energy was partitioned two ways. In one way, the silicon reduction, silicon purification, sheet formation, cell fabrication, and encapsulation energies were found. In addition, the facility, equipment, processing material and direct material lost-in-process energies were appropriated in junction formation processes and full module manufacturing sequences. A brief methodology accounting for the energy of silicon wafers lost-in-processing during cell manufacturing is described.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-162904 , DOE/JPL-954796-79/7
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  • 8
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    Experiments to evaluate high-temperature rolling as a low-cost process for silicon solar cells (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mechanical rolling (a process used in industry for producing large quantities of metallic sheet and strip) has been suggested for the rapid low-cost manufacture of silicon sheet to be used for photovoltaic power generation equipment, such as solar arrays. The advantages of rolling include: high rates of production, wide sheets as products, good control of dimension, and (in the case of solar grade silicon) minimal development of impurities. Experiments have been performed using high-temperature, high-speed compression of polycrystalline silicon cylinders. Metallography and X-ray diffraction techniques have been used to examine the samples both before and after compression, and a model process has been designed to evaluate the technical practicality and economic feasibility of the method.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; Nov 15, 1976 - Nov 18, 1976; Baton Rouge, LA
    Format: text
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  • 9
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    Analysis and evaluation of processes and equipment in tasks 2 and 4 of the low-cost solar array project (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Several experimental and projected Czochralski crystal growing process methods were studied and compared to available operations and cost-data of recent production Cz-pulling, in order to elucidate the role of the dominant cost contributing factors. From this analysis, it becomes apparent that the specific add-on costs of the Cz-process can be expected to be reduced by about a factor of three by 1982, and about a factor of five by 1986. A format to guide in the accumulation of the data needed for thorough techno-economic analysis of solar cell production processes was developed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158681 , DOE/JPL-954796-77/1 , JPL-9950-61
    Format: application/pdf
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  • 10
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    Lessons Learned from Flight Observations of the GOES-R Magnetometer (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Geostationary Operational Environmental Satellite (GOES)-16 observatory was launched on 19 November 2016. During daily on-orbit operations, shadowing of the inboard magnetometer sensor unit occurs due to spacecraft geometry and solar angle. Throughout the shadowing periods of the inboard magnetometer, anomalous excursions of 20 nanotesla (nT) are observed. In addition to the excursions during shadow events, the measurement difference between the inboard and outboard magnetometer varies over the day, indicating erroneous measurements by one or both magnetometers. In addition, based on the deployment rotations, the zero offsets of the X and Y axes were found to be significantly different, ~30nT, from ground calibration data. Because of these observations, an extensive root cause investigation was undertaken to correct the magnetometer system for the next spacecraft in the GOES-R series. This paper documents the efforts of that activity and the lessons learned as a result of the investigation.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN68765 , 2019 ESA Workshop on Aerospace EMC; May 20, 2019 - May 22, 2019; Budapest; Hungary
    Format: application/pdf
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