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  • GEOPHYSICS  (162)
  • BIOSCIENCES  (73)
  • COMMUNICATIONS  (61)
  • ASTROPHYSICS
  • LUNAR AND PLANETARY EXPLORATION
  • 1975-1979
  • 1970-1974  (297)
  • 1972  (297)
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  • 1975-1979
  • 1970-1974  (297)
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  • 1
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    Atmospheric density variations at 140 kilometers deduced from precise satellite radar tracking data. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Discussion of the technique of evaluating density values from precise radar-tracking data of satellites in the altitude region from 130 to 140 km. Inclinations of these satellites were between 106 and 112 deg. A detailed examination of all elements of the density-reduction techniques was conducted, and consideration was given to recent advances in geodesy, drag-coefficient modeling, and orbit-determination techniques. Ten days of high-resolution density data deduced from orbital decay of each of three satellites are presented. Three types of density variations at 140 km are discernible in these data: periodic daily density variations with a density amplitude of about 10%; density increases of up to 35% associated with enhanced geomagnetic activity during which the planetary geomagnetic index Kp reached a value of 8 units; and an observed semiannual variation of about 20%, which indicates a total semiannual variation of 35 to 40%.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 77; Apr. 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Arctic and subarctic environmental analyses utilizing ERTS-1 imagery (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): GEOPHYSICS
    Materialart: E73-10421 , NASA-CR-131211
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Artic and subarctic environmental analyses utilizing ERTS-1 imagery. Cold regions environmental analysis based on ERTS-1 imagery (preprint) (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: There are no author-identified significant results in this report. An overriding problem in arctic and subarctic environmental research has been the absence of long-term observational data and the sparseness of geographical coverage of existing data. A first look report is presented on the use of ERTS-1 imagery as a major tool in two large area environmental studies: (1) investigation of sedimentation and other nearshore marine processes in Cook Inlet, Alaska; and (2) a regional study of permafrost regimes in the discontinuous permafrost zone of Alaska. These studies incorporate ground truth acquisition techniques that are probably similar to most ERTS investigations. Studies of oceanographic processes in Cook Inlet will be focused on seasonal changes in nearshore bathymetry, tidal and major current circulation patterns, and coastal sedimentation processes, applicable to navigation, construction, and maintenance of harbors. Analyses will be made of the regional permafrost distribution and regimes in the Upper Koyukuk-Kobuk River area located in NW Alaska.
    Schlagwort(e): GEOPHYSICS
    Materialart: E72-10209 , NASA-CR-128480 , BMPR-2 , Intern. Symp. on Remote Sensing of Environ.; Oct 02, 1972 - Oct 06, 1972; Ann Arbor, MI; United States
    Format: application/pdf
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  • 4
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    Kansas environmental and resource study: A Great Plains model, tasks 1-6 (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-20
    Beschreibung: There are no author identified significant results in this report. Environmental and resources investigations in Kansas utilizing ERTS-1 imagery are summarized for the following areas: (1) use of feature extraction techniqued for texture context information in ERTS imagery; (2) interpretation and automatic image enhancement; (3) water use, production, and disease detection and predictions for wheat; (4) ERTS-1 agricultural statistics; (5) monitoring fresh water resources; and (6) ground pattern analysis in the Great Plains.
    Schlagwort(e): GEOPHYSICS
    Materialart: E72-10305 , NASA-CR-129554
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Lipid composition of growing and starving cells of Arthrobacter crystallopoietes. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Missing abstr.
    Schlagwort(e): BIOSCIENCES
    Materialart: Journal of Bacteriology; 111
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    The earth's atmosphere. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2016-03-07
    Beschreibung: Topics discussed include the effects of solar radiation on the heat balance of the earth and its atmosphere, the physicomathematical models of the atmosphere and the computational schemes used in numerical investigations of the general circulation of the atmosphere, the effects of atmospheric turbulence on aeronautical systems, te chemistry of different regions of the atmosphere, the use of hot-filament and cold-cathode vacuum gauges to measure upper-atmosphere densities, methods of determining the air density at heights near a satellite's perigee by analyzing changes in its orbit, and an evaluation of various atmospheric models in the 100- to 1000-km altitude range.
    Schlagwort(e): GEOPHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    The National Aeronautics and Space Administration-U.S. Public Health Service Health Evaluation and Enhancement Program - Summary of results. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: An exercise program was initiated in a federal agency to assess the feasibility of such a program, and to identify the factors that influenced joining, adherence to, and effectiveness of the program. The program was utilized by 237 of the 998 eligible federal employees; mean attendance rate was 1.3 days/week. Those who volunteered perceived a need for increased physical activity, believed they had sufficient time to participate and derived subjective as well as objective benefits. Significant improvements were found in heart rate response to the standard exercise test, body weight, skinfold measurements and triglyceride levels.
    Schlagwort(e): BIOSCIENCES
    Materialart: American Journal of Cardiology; 30; Nov. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Evidence for a metabolic limitation of survival in hypothermic hamsters. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The underlying factors limiting survival in the hypothermic state are studied. Hamsters of both sexes, clipped and unclipped, were inducted into profound hypothermia by the helium cold method until they reached a temperature between 7 and 10 C. It appears that the primary cause of death is failure of respiration due to the depletion of carbohydrate energy supplies and may explain why survival time in hypothermia is shorter than the normal hibernation time of the hamster.
    Schlagwort(e): BIOSCIENCES
    Materialart: Society for Experimental Biology and Medicine; vol. 140
    Format: text
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  • 9
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    Supersonic and subsonic measurements of mesospheric ionization. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An Arcas rocket-parachute system was used at night to compare supersonic and subsonic ionization measurements below 75 km. A hemispherical nose-tip probe was used on ascent and a parachute-borne blunt probe on descent to measure polar conductivities, which were due entirely to positive and negative ions. The velocity of the supersonic probe was Mach 2.5 at 50 km and 1.75 at 70 km; the blunt probe was subsonic below 71 km. Between 65 and 75 km the ratio of negative to positive conductivities (and thus of mobilities) determined by the blunt probe was about 1.2, and it approached 1 below this altitude range. The ratio obtained by the nose-tip probe varied from 1.5 at 75 km to .6 at 65 km, thus indicating a rapid variation of the effects of the shock wave on the sampled ions. The absolute values of positive conductivity measured subsonically and supersonically were essentially identical from 60 to 75 km, indicating that the sampled ions were unchanged by the shock. However, below 60 km the shock apparently 'broke up' the positive ions, as indicated by higher measured conductivities.
    Schlagwort(e): GEOPHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Local-time survey of plasma at low altitudes over the auroral zones. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Local-time survey of the low-energy proton and electron intensities precipitated into the earth's atmosphere over the auroral zones during periods of magnetic quiescence. This survey was constructed by selecting a typical individual satellite crossing of this region in each of eight local-time sectors from a large library of similar observations with the polar-orbiting satellite Injun 5. The trapping boundary for more-energetic electron intensities, E greater than 45 keV, was found to be a 'natural coordinate' for delineating the boundary between the two major types of lower-energy, 50 less than or equal to E less than or equal to 15,000 eV, electron precipitation commonly observed over the auroral zones at low altitudes. Poleward of this trapping boundary inverted 'V' electron precipitation bands are observed in all local-time sectors. These inverted 'V' electron bands in the evening and midnight sectors are typically more energetic and have greater latitudinal widths than their counterparts in the noon and morning sectors. In general, the main contributors to the electron energy influx into the earth's atmosphere over the auroral zones are the electron inverted 'V' precipitation poleward of the trapping boundary in late evening, the plasma-sheet electron intensities equatorward of this boundary in early morning, and both of these precipitation events near local midnight.
    Schlagwort(e): GEOPHYSICS
    Materialart: AD-749423 , Journal of Geophysical Research; 77; Aug. 1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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