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  • GEOPHYSICS  (226)
  • LUNAR AND PLANETARY EXPLORATION  (104)
  • SPACE VEHICLES  (61)
  • 2020-2023
  • 2010-2014
  • 1970-1974  (391)
  • 1965-1969
  • 1974  (391)
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  • 2020-2023
  • 2010-2014
  • 1970-1974  (391)
  • 1965-1969
Year
  • 1
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    Vacuum jacketed composite propulsion feedlines for cryogenic launch and space vehicles. Volume 2: Appendixes (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For abstract, see N74-18505.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134554
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    California coastal processes study (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Preliminary findings are presented and applications derived from ERTS-1 satellite imagery of the nearshore coastal processes of the California coast. The objectives were to analyze nearshore currents, sediment transport, and estuarine and river discharges along the California coast through the use of synoptic and repetitive imagery from ERTS as well as aircraft underflights and surface data. The major conclusions are: (1) Distinct seasonal patterns for sediment transport as a function of the oceanic current systems and coastal morphology have been identified. (2) Large scale sediment plumes from intermittent streams and rivers extend offshore to previously unanticipated ranges. (3) Computer generated contouring of radiance levels from computer-compatible tapes result in charts that can be used for determination of surface and nearsurface suspended sediment distribution. (4) Flying spot scanner enhancements result in details of nearshore features. (5) Data is providing significant information for coastal planning and construction projects.
    Keywords: GEOPHYSICS
    Type: PAPER-M7 , NASA. Goddard Space Flight Center 3d ERTS-1 Symp., Vol. 1, Sect. B; p 1413-1466
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Six-color photometry of Iapetus, Titan, Rhea, Dione and Tethys (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Six-color photometric observations made during Saturn's 1972/73 opposition enable us to separate the solar phase and orbital phase contributions to the observed light variations of Iapetus, Titan, Rhea, Dione and Tethys. Titan shows no orbital variations, but has phase coefficients which range from negligible values in the infrared to 0.014 mag/deg in the ultraviolet. Rhea has a bright leading side, a light curve amplitude of about 0.2 mag, and surprisingly large phase coefficients. Combined with other available information, the observations suggest a very porous, texturally complex surface layer. Dione has a leading side which is a few tenths of a magnitude brighter than the trailing side, but the light curve amplitude has little wavelength dependence and the phase coefficients are significantly smaller than those of Rhea, suggesting a less intricate surface texture. The leading side of Tethys is probably a few tenths of a magnitude brighter than the trailing side. Our Iapetus observations generally supplement the earlier work by Millis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 23; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Periodic variations in stratospheric meridional wind from 20-65 km, at 80 deg N to 8 deg S (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The variability of stratospheric meridional winds is examined in both space and time. Height-latitude sections for January along 70 deg E and 90 deg W show a divergence zone above 50 km near 60 deg N and an intense convergence zone 40 km near 50 deg N over North America. This latter structure, with southward winds in the Arctic and northward winds at mid-latitudes over North America, persists from October through April. Tidal winds dominate all other circulation features in summer at all latitudes, and throughout the year at low latitudes. To help understand the observed patterns of variability, long-term periodic features are analyzed. The quasi-biennial oscillation, annual wave, and four-month wave have amplitudes of about 10, 20, and 10 m/sec respectively in the Arctic near 45 km. The phase of the annual wave changes by nearly 180 deg in a narrow zone near 45 deg N. The semiannual wave has an amplitude of 10 m/sec. 50 deg N above 50 km equinoctial phase dates in the region of maximum amplitude. This polar semiannual wave corresponds closely to that previously found in the zonal wind.
    Keywords: GEOPHYSICS
    Type: NASA-CR-114744 , RR-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Vacuum jacketed composite propulsion feedlines for cryogenic launch and space vehicles, volume 1 (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Thin metallic liners that provide leak-free service in cryogenic propulsion systems are overwrapped with a glass-fiber composite that provides strength and protection from handling damage. The resultant tube is lightweight, strong, and has a low thermal flux. The inside commodity flow line and the outside vacuum jacket were fabricated using this method. Several types of vacuum jackets were fabricated and tested at operating temperatures from 294 to 21 K (+70 to minus 423 F) and operating pressure up to 69 N/cm2 (100 psi). The primary objective of the program was to develop vacuum jacket concepts, using previously developed concepts for the inner line. All major program objectives were met resulting in a design concept that is adaptable to a wide range of aerospace vehicle requirements. Major items of development included convolution of thin metallic sections up to 46 cm (18 in.) in diameter, design and fabrication of an extremely lightweight tension membrane concept for the vacuum jacket, and analytical tools that predict the failure mode and levels.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134550
    Format: application/pdf
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  • 6
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    Surface electrical properties experiment, part 2 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For abstract, see N75-15570.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-141472
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Surface electrical properties experiment, part 1 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The work is reported which was performed on the Surface Electrical Properties Experiment Data Acquisition System. Areas discussed include: data handling and processing, installation and external signal application, operation of the equipment, and digital output. Detailed circuit descriptions are included.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-141471
    Format: application/pdf
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  • 8
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    Micrometeoroids and lunar rocks (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Description of present concepts of the lunar micrometeoroid flux as deduced from microcrater observations on lunar rocks and available laboratory simulations with smooth glassy surfaces. Results examined include factors governing microcrater morphology, size frequency distribution, and correlation of lunar rock surface exposure ages with absolute crater number densities.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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  • 9
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    The micrometeoroid complex and evolution of the lunar regolith (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The interaction of the micrometeoroid complex with the lunar surface is evidenced by numerous glass-lined microcraters on virtually every lunar surface exposed to space. Such craters range in size from less than .1 micron to approximately 2 sq cm diameter. Using small scale laboratory cratering experiments for calibration, the observed crater-sized frequency distributions may be converted into micrometeoroid mass distributions. These lunar mass distributions are in essential agreement with satellite data. Some physical properties of micrometeoroids may be deduced by comparing lunar crater geometries with those obtained in laboratory experiments. The proponderance of circular outlines of lunar microcraters necessitates equidimensional, if not spherical, micrometeoroids.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-X-72191 , REPT-210 , Sov.-Am. Conf. on the Cosmochem. of the Moon and Planets,; Jun 04, 1974 - Jun 08, 1974; Moscow; Soviet Union
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    California coast nearshore processes study (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10692 , NASA-CR-139225
    Format: application/pdf
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