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  • Other Sources  (12)
  • 1975-1979  (12)
  • 1
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    A study of the potential impacts of space utilization (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Because the demand for comprehensive impact analysis of space technologies will increase with the use of space shuttles, the academic social sciences/humanities community was surveyed in order to determine their interests in space utilization, to develop a list of current and planned courses, and to generate a preliminary matrix of relevant social sciences. The academic scope/focus of a proposed social science space-related journal was identified including the disciplines which should be represented in the editorial board/reviewer system. The time and funding necessary to develop a self-sustaining journal were assessed. Cost income, general organizational structure, marking/distribution and funding sources were analyzed. Recommendations based on the survey are included.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-163131
    Format: application/pdf
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  • 2
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    Do surges heat the corona (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A comparison of X-ray filtergrams obtained during the Skylab mission 8 hr before and within 4 hr following 54 active region surges on the disk revealed only 6 cases of long-enduring, large-scale (exceeding 10,000 km) coronal enhancements that might have been associated with surge activity. It is concluded that there is no evidence for any substantial increase in the temperature or amount of coronal material during reported surges.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 54; Sept
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  • 3
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    Sprayable low density ablator and application process (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A sprayable, low density ablative composition is described consisting esentially of: (1) 100 parts by weight of a mixture of 25-65% by weight of phenolic microballoons, 0-20% by weight of glass microballoons, 4-10% by weight of glass fibers, 25-45% by weight of an epoxy-modified polyurethane resin, 2-4% by weight of a bentonite dispersing aid, and 1-2% by weight of an alcohol activator for the bentonite; (2) 1-10 parts by weight of an aromatic amine curing agent; and (3) 200-400 parts by weight of a solvent.
    Keywords: COMPOSITE MATERIALS
    Format: application/pdf
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  • 4
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    The NASA Standard 20 Ampere Hour Nickel-Cadmium Battery Manual (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The NASA standard 20 ampere hour spacecraft nickel-cadmium battery in described. Mechanical electrical and thermal data are supplied. Both qualification and acceptance tests are described. Information on handling and storage is given.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-166700 , MMS-408-2101-0003
    Format: application/pdf
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  • 5
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    JT8D and JT9D jet engine performance improvement program. Task 1: Feasibility analysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: JT8D and JT9D component performance improvement concepts which have a high probability of incorporation into production engines were identified and ranked. An evaluation method based on airline payback period was developed for the purpose of identifying the most promising concepts. The method used available test data and analytical models along with conceptual/preliminary designs to predict the performance improvements, weight, installation characteristics, cost for new production and retrofit, maintenance cost, and qualitative characteristics of candidate concepts. These results were used to arrive at the concept payback period, which is the time required for an airline to recover the investment cost of concept implementation.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-159449 , PWA-5518-38
    Format: application/pdf
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  • 6
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    Evidence linking coronal transients to the evolution of coronal holes (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The positions of X-ray coronal transients outside of active regions observed during Skylab were superposed on H-alpha synoptic charts and coronal hole boundaries for seven solar rotations. A detailed spatial association between the transients and neutral lines was confirmed. It was found that most of the transients were related to large-scale changes in coronal hole area and tended to occur on the borders of evolving equatorial holes.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 58; July 197
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  • 7
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    X-ray analysis of a polar plume (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Polar plumes have been detected in X-rays with the Skylab S-054 experiment. Observations of one well-observed plume are analyzed and the plasma pressure is determined. An isothermal model in hydrostatic equilibrium is found to require unacceptably low temperatures. A hydrodynamic model is proposed which is consistent with earlier white light and EUV observations. Calculations indicate that the total outward mass flux in polar plumes is comparable to that in high speed solar wind streams expected from a polar coronal hole.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 58; July 197
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  • 8
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    Coronal X-ray enhancements associated with H-alpha filament disappearances (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The X-ray telescope experiment aboard the Skylab/ATM mission provided high-resolution soft X-ray images of the lower corona away from active regions, revealing frequent large-scale transient X-ray enhancements which could often be associated with the disappearance of H-alpha filaments. The X-ray emitting structures featured peak brightnesses similar to those of nonflaring active region structures, durations from 3 to 40 hours, shapes that in general outlined the preexisting H-alpha filaments to as large as 400,000 km, apparent expansion velocities of the order of tens of km/sec, and observed peak temperatures of the order of a few million degrees. One such event is described and analyzed in detail. Two explanations of the events are discussed: (1) excess cool material is present in the filament cavity, contributing to the X-ray enhancement, and (2) the enhancement is due to the compression of preexisting material by a changing magnetic field.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 48; May 1976
    Format: text
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  • 9
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    Geomagnetic field fluctuations at synchronous orbit. II - Radial diffusion (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Power spectra of geomagnetic-field variations measured at synchronous equatorial altitude (geomagnetic shell parameter about 6.6) in the magnetosphere are used to calculate the time dependence of the radial diffusion coefficient for particles in the radiation belts. The diffusion coefficients calculated are mainly applicable for relativistic electrons. The magnitudes of the derived diffusion coefficients using data only from local day observations are consistent with those reported from analyses of most particle observations and thus are slightly larger than those derived from magnetic sudden commencements. They are consistent with the diffusion coefficients calculated from power spectra of ground-based geomagnetic data measured near L = 4.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Aug. 1
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  • 10
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    Geomagnetic field fluctuations at synchronous orbit. I - Power spectra (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: ULF power spectra of geomagnetic variations at synchronous orbit are calculated for August 1974 on the basis of data from the UCLA triaxial fluxgate magnetometer on ATS 6. Emphasis is placed on the examination of the background spectrum, and therefore the diurnal differences and all relationships in magnetic activity as reflected in the Kp index. The average power spectrum at synchronous orbit is also compared with reported observations from the interplanetary medium, the magnetosheath, the region inside the magnetosphere near the magnetopause, and the ground.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Aug. 1
    Format: text
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