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  • Other Sources  (13)
  • 1995-1999
  • 1985-1989
  • 1980-1984  (13)
  • 1965-1969
  • 1982  (13)
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  • 1995-1999
  • 1985-1989
  • 1980-1984  (13)
  • 1965-1969
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  • 1
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    A simplified solar cell array modelling program (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: As part of the energy conversion/self sufficiency efforts of DSN engineering, it was necessary to have a simplified computer model of a solar photovoltaic (PV) system. This article describes the analysis and simplifications employed in the development of a PV cell array computer model. The analysis of the incident solar radiation, steady state cell temperature and the current-voltage characteristics of a cell array are discussed. A sample cell array was modelled and the results are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: The Telecommun. and Data Acquisition Rept.; p 167-185
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Potential availability of diesel waste heat at Echo Deep Space Station (DSS 12) (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Energy consumption at the Goldstone Echo Deep Space Station (DSS 12) is predicted and quantified for a future station configuration which will involve implementation of proposed energy conservation modifications. Cogeneration by the utilization of diesel waste-heat to satisfy site heating and cooling requirements of the station is discussed. Scenarios involving expanded use of on-site diesel generators are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: The Telecommun. and Data Acquisition Progr. J.; p 166-182
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Multiple and variable speed electrical generator systems for large wind turbines (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A cost effective method to achieve increased wind turbine generator energy conversion and other operational benefits through variable speed operation is presented. Earlier studies of multiple and variable speed generators in wind turbines were extended for evaluation in the context of a specific large sized conceptual design. System design and simulation have defined the costs and performance benefits which can be expected from both two speed and variable speed configurations.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Large Horizontal-Axis Wind Turbines; p 125-136
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    NASA TECHNICAL REPORTS
  • 4
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    Standing hydromagnetic waves observed by ISEE 1 and 2 - Radial extent and harmonic (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Direct measurements of the spatial extent of the resonant hydromagnetic waves associated with Pc 4 and 5 magnetic pulsations made by the closely spaced ISEE 1 and 2 satellites are presented together with ISEE 1 determinations of the harmonic of the resonant waves. The use of two satellites in similar orbits, which makes it possible to distinguish between spatial and temporal features, has shown the resonant region widths to extend over about 0.2 to 1.6 L shells for three events detected on the dayside between L = 4 and L = 7. The two events for which plasma density data was available occurred at plasma density gradients in the vicinity of the plasmapause. The standing wave harmonic was determined by the combination of two techniques: the comparison of the observed wave period with that predicted by standing wave theory, and the comparison of the phases of the observed wave electric and magnetic field. The two events analyzed are found to be second harmonic oscillations, suggesting internal generation in the magnetosphere by a bounce resonant mechanism.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 87; May 1
    Format: text
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  • 5
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    System albedo as sensed by satellites - Its definition and variability (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: System albedo, an important climatological and environmental parameter, is considered. Some of the problems and assumptions involved in evaluating albedo from satellite data are discussed. Clear-sky and cloud albedos over the United Kingdom and parts of northwest Europe are treated. Consideration is given to the spectral, temporal, and spatial variations and the effect of averaging. The implications of these results for those using and archiving albedo values and for future monitoring of system albedo are discussed. Normalization is of especial importance since this correction alters many albedo values. The pronounced difference in spectral albedo of the two visible channels reemphasizes the problem of attempting to calculate integrated albedo values from meteorological satellite data. The assumption of isotropic reflection is seen to be invalid, hindering the computation of accurate albedo values.
    Keywords: GEOPHYSICS
    Type: International Journal of Remote Sensing; 3; Jan
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  • 6
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    Midlatitude Pi2 pulsations: AFGL and ISEE magnetometer observations correlated (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The ISEE observations of the pi2 magnetic pulsations occuring substorm onset in the inner magnetosphere are discussed. One of these events which was also detected as a pi2 event by the AFGL midlatitude magnetometers is considered. The event occurred when the foot of the ISEE field line was over North America. The ground and satellite signals are remarkably similar: they start and stop at the same time, have the same period and can be correlated cycle by cycle. The waves are detected in the electric field data from ISEE 1 and in the magnetic field data from both ISEE 1 and ISEE 2. Calculation of the Poynting vector at ISEE 1 shows that the energy flowed mainly westward, but that there was also a component towards the nearer (southern) ionospheric foot of the field line. The phases between the various field components measured by ISEE 1 and 2 indicate that this is a standing hydromagnetic oscillation.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-84763 , NAS 1.15:84763
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  • 7
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    A solar flare X-ray polarimeter for the Space Shuttle (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An instrument has recently been built and tested which is designed to measure the polarization of the hard (5-30 keV) X-ray emission from solar flares, and thereby to investigate the energy release mechanism and constrain flare models. In particular, these measurements will help to determine whether hard X-ray bursts are produced by nonthermal or by thermal electrons. The polarimeter makes use of the angular dependence of Thomson scattering from targets of metallic lithium. It has an energy resolution of a few keV, a time resolution of 5 s, and sufficient sensitivity to measure polarization levels (3 sigma) of a few percent in about 10 s for a moderate strength solar flare. The instrumental polarization has been directly measured and found to be within the design goal of approximately 1%. This polarimeter is scheduled to be flown as part of the OSS-1 pallet on an early Space Shuttle mission.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Solar Physics; 80; Oct. 198
    Format: text
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  • 8
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    SEASAT: A satellite scatterometer illumination times of selected in situ sites (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A list of times that the SEASAT A Satellite Scatterometer (SASS) illuminated from directly above or directly abeam, selected surface sites where in situ winds were measured is provided. The list is ordered by the Greenwich Mean Time (GMT) of the midpoint of the illumination period (hit time) for a given surface site. The site identification, the orbit number and the direction from the subtrack in which the truth lies are provided. The accuracy of these times depends in part upon the ascending node times, which are estimated to be within +.1 sec, and on the illumination time relative to the ascending node, which is estimated to be within +6 seconds. The uncertainties in the times provided were judged to be sufficiently small to allow efficient and accurate extraction of SASS and in situ data at the selected surface sites. The list contains approximately six thousand hit times from 61 geographically dispersed sites.
    Keywords: OCEANOGRAPHY
    Type: NASA-TM-83280 , NAS 1.15:83280
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  • 9
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    Pulsation research during the IMS (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: After describing the development status of the field of magnetic pulsations in 1975, before the initiation of the International Magnetospheric Study (IMS), attention is given to the IMS's novel observational results and an attempt is made to identify the most effective research methods employed. It is found that the most fruitful work involved small-scale collaboration between a few individuals or a few groups possessing complementary data sets. Consideration is restricted to research on the long period pulsations which can be broadly classified as field line resonances. Recommendations are made for future research efforts.
    Keywords: GEOPHYSICS
    Format: text
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  • 10
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    Order reduction for models of space structures using modal cost analysis (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Modal cost analysis furnishes a promising methodology for developing dynamical models of space structures for use in control systems analysis. Economy and accuracy can be attained by only retaining vibration modes that contribute significantly to an appropriately defined cost function. Expressions for modal costs (especially simple for 'lightly damped' structures) are derived for attitude control, vibration suppression, and shape control. These techniques are illustrated through application to a high-order finite element model of a large platform-type structure.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Format: text
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