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  • EARTH RESOURCES AND REMOTE SENSING  (121)
  • ENERGY PRODUCTION AND CONVERSION  (113)
  • ASTROPHYSICS  (103)
  • METEOROLOGY AND CLIMATOLOGY  (49)
  • 1980-1984  (386)
  • 1980  (386)
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  • 1980-1984  (386)
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  • 1
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    Hercules X-1 hard X-ray pulsations observed from HEAO 1 (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The 1.24-sec pulsations of Her X-1 in the energy range 13-75 keV have been analyzed in data obtained from the UCSD/MIT experiment on HEAO 1 during observations of the source on three dates in February 1978 and three in August 1978. Observational results are (1) the main pulse broadens somewhat with increasing energy; (2) the pulsation light curve undergoes pronounced changes at the leading edge of the main pulse from day to day; (3) spectral hardening within the main pulse is confirmed; (4) a 40-60 keV spectral feature in the spectrum is confirmed; (5) this feature is resolved, the pulse width broadening is greater than 20%, and its centroid varies with pulsation phase; and (6) the 13-75 keV spectrum does not noticeably vary from day to day, except for an overall intensity factor. Some implications of these results for the prevailing models of Her X-1 and the HZ Her-Her X-1 system are briefly discussed.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 240
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Trophic classification of Tennessee Valley area reservoirs derived from LANDSAT multispectral scanner data (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: LANDSAT MSS data from four different dates were extracted from computer tapes using a semiautomated digital data handling and analysis system. Reservoirs were extracted from the surrounding land matrix by using a Band 7 density level slice of 3; and descriptive statistics to include mean, variance, and ratio between bands for each of the four bands were calculated. Significant correlations ( 0.80) were identified between the MSS statistics and many trophic indicators from ground truth water quality data collected at 35 reservoirs in the greater Tennessee Valley region. Regression models were developed which gave significant estimates of each reservoir's trophic state as defined by its trophic state index and explained in all four LANDSAT frames at least 85 percent of the variability in the data. To illustrate the spatial variations within reservoirs as well as the relative variations between reservoirs, a table look up elliptical classification was used in conjunction with each reservoir's trophic state index to classify each reservoir on a pixel by pixel basis and produce color coded thematic representations.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E81-10008 , NASA-CR-163528
    Format: application/pdf
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  • 3
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    Thermal mapping, geothermal source location, natural effluents and plant stress in the Mediterranean coast of Spain (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Although no significant results were achieved during the report period, research continues. A sample of imagery showing thermal inertia and temperature differences over the northeastern United States and Europe was received. The project coordinator attended a TELLUS Project meeting in Ispra, Italy at which general guidelines for the future were established and the quality of the data received was discussed.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E81-10119 , NASA-CR-164113 , PR-3
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    A Conceptual Design Study of a High Temperature Solar Thermal Receiver (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A conceptual design was made for a solar thermal receiver capable of operation in the 1095 to 1650 C (2000 to 3000 F) temperature range. This receiver is designed for use with a two-axis paraboloidal concentrator in the 25 to 150 kW sub t power range, and is intended for industrial process heat, Brayton engines, or chemical/fuels reactions. Three concepts were analyzed parametrically. One was selected for conceptual design. Its key feature is a helical coiled tube of sintered silicon nitride which serves as the heat exchanger between the incident solar radiation and the working fluid. A mechanical design of this concept was prepared, and both thermal and stress analysis performed. The analysis showed good performance, low potential cost in mass production, and adaptability to both Brayton cycle engines and chemical/fuels production.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CR-168925 , JPL-9950-483 , NAS 1.26:168925 , GEEP-66
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Applied Remote Sensing Program (ARSP) (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E80-10330 , NASA-CR-163416
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Binary model of Circinus X-1. I - Eccentricity from combined X-ray and radio observations (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: A binary star model is used to account for the 16.59-d flaring behavior of the X-ray emission from Circinus X-1. The orbital eccentricity of 0.8 + or - 0.1 is derived from the X-ray light curve by assuming that the sharp X-ray cut-off every 16.59-d is a result of bound-free absorption in the primary star's stellar wind. The shape of the light curve has changed over the last eight years, and this is interpreted as due to orbital precession of the binary system. Simultaneous radio and X-ray observations of the flare from Circinus X-1 on February 1-5, 1978 are reported. These are accounted for within the framework of the model. The radio observations at 5 GHz are used independently to derive a high value of the orbital eccentricity (e = 0.7).
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomy and Astrophysics; 86; 3, Ju; July 198
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Microwave radar and radiometric remote sensing measurements of lake ice (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: Simultaneous microwave radar and spectral radiometric data were collected over Lake Erie during March 1978. A theoretical development is presented which interprets the data collected at nadir in terms of changes in the ice thickness and the electromagnetic attenuation coefficient. The theory also addresses the failure of the spectral radiometer to determine ice thickness through observations of quarter wavelength excursions in the reflectivity. Radar data collected off-nadir showed a substantially different behavior compared to that collected near nadir. This difference is attributed to a change in propagation characteristics from quasi-specular return from the ice-water interface to scattering from the rough air-ice interface.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Geophysical Research Letters; 7; Apr. 198
    Format: text
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  • 8
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    Snowpack monitoring in North America and Eurasia using passive microwave satellite data (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Areas of the Canadian high plains, the Montana and North Dakota high plains, and the steppes of central Russia have been studied in an effort to determine the utility of spaceborne microwave radiometers for monitoring snow depths in different geographic areas. Significant regression relationships between snow depth and microwave brightness temperatures were developed for each of these homogeneous areas. In each of the study areas investigated in this paper, Nimbus-6 (0.81 cm) ESMR data produced higher correlations than Nimbus-5 (1.55 cm) ESMR data in relating microwave brightness temperature to snow depth. It is difficult to extrapolate relationships between microwave brightness temperature and snow depth from one area to another because different geographic areas are likely to have different snowpack conditions.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Remote Sensing of Environment; 10; Dec. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Interplanetary sector boundaries 1971-1973 (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: The large-scale morphology and internal structure of sector boundaries (SB) are investigated, using observations at 1 AU of interplanetary SB crossings. It was found that the durations of the SBs were either relatively short (less than about 10 min) or relatively long (longer than about 3 hours). Using the minimum variance technique, it was found that the SB surfaces were inclined appreciably with respect to the ecliptic at this epoch of the solar cycle (1971-1973). Magnetic holes were found in thick SBs at a rate about three times that elsewhere. In addition, an analysis of tangential discontinuities showed that their orientations were generally not related to the orientations of the SB surface, but their characteristics were very similar to those for discontinuities outside the SBs.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Journal of Geophysical Research; 85; May 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Measurement of Electromagnetic Properties of Lightning with 10 Nanosecond Resolution (1980)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Electromagnetic data recorded from lightning strikes are presented. The data analysis reveals general characteristics of fast electromagnetic fields measured at the ground including rise times, amplitudes, and time patterns. A look at the electromagnetic structure of lightning shows that the shortest rise times in the vicinity of 30 ns are associated with leader leader streamers. Lightning location is based on electromagnetic field characteristics and is compared to a nearby sky camera. The fields from both leaders and return strokes were measured and are discussed. The data were obtained during 1978 and 1979 from lightning strikes occuring within 5 kilometers of an underground metal instrumentation room located on South Baldy peak near Langmuir Laboratory, New Mexico. The computer controlled instrumentation consisted of sensors previously used for measuring the nuclear electromagnetic pulse (EMP) and analog-digital recorders with 10 ns sampling, 256 levels of resolution, and 2 kilobytes of internal memory.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: NASA Langley Res. Center Lightning Technol.; p 39-83
    Format: application/pdf
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