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  • General Chemistry  (12.593)
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  • GEOPHYSICS  (5.929)
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  • 1
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    Organic geochemistry of Early Precambrian sediments (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-12-21
    Schlagwort(e): GEOPHYSICS
    Materialart: Life Sci. Publ., Vol. 2; 11 p
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  • 2
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    Preliminary examination of lunar samples (1970)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-12-21
    Beschreibung: Geochemical and minerological analyses of Apollo 12 soil and rock samples
    Schlagwort(e): GEOPHYSICS
    Materialart: APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 189-216
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  • 3
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    Preliminary geologic investigation of the Apollo 12 landing site. Part B - Photometric and polarimetric properties of the lunar regolith (1970)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-06
    Beschreibung: Photometric and polarimetric properties of Apollo 12 and Surveyor 3 landing sites
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. MANNED SPACECRAFT CENTER APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 157-161
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  • 4
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    Preliminary geologic investigation of the Apollo 12 landing site. Part C - Mechanical properties of the lunar regolith (1970)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-06
    Beschreibung: Soil mechanics of regolith around Apollo 12 landing site
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA MANNED SPACECRAFT CENTER APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 161-182
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  • 5
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    Preliminary geologic investigation of the Apollo 12 landing site. Part A - Geology of the Apollo 12 landing site (1970)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-06
    Beschreibung: Apollo 12 landing site geology and topography
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. MANNED SPACECRAFT CENTER APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 113-156
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  • 6
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    Passive seismic experiment (1970)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-06
    Beschreibung: Apollo 12 passive seismometer design and signal interpretation
    Schlagwort(e): GEOPHYSICS
    Materialart: APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 39-53
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  • 7
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    Lunar surface magnetometer experiment (1970)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-06
    Beschreibung: Apollo 12 magnetometer data and selenomagnetic field determinations
    Schlagwort(e): GEOPHYSICS
    Materialart: APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 55-73
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  • 8
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    Preliminary results from Surveyor 3 analysis (1970)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-01
    Beschreibung: Engineering and scientific analysis of Surveyor 3 dust, TV camera, and structural components
    Schlagwort(e): GEOPHYSICS
    Materialart: APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 217-223
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  • 9
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    Chemistry of the upper atmosphere and the role of transport processes (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The important chemical reaction affecting the neutral composition of the upper stratosphere, mesosphere, and lower thermosphere is discussed. The role of atmospheric transport processes is emphasized and the problem of taking these into account is elucidated.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Phys. of the Space Environment; p 147-155
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  • 10
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    Transient heating in the upper atmosphere (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The time-dependent response of the upper atmosphere to transient heat sources is considered. The basic problem is that of heating a compressible, heat-conducting fluid, which is described in the one-dimensional case by an analytic solution. Comparisons with satellite drag data of such first-order solutions are shown to be useful in determining energy requirements and in determining some constraints on the spatial distribution of the heating. Recent OGO-6 mass spectrometer and interferometric temperature measurements show that atmospheric disturbances during geomagnetic storms are much more prominent in the auroral zones. These results suggest that joule dissipation of auroral currents are important contributors to orbital perturbations of satellites.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Phys. of the Space Environment; p 3-23
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  • 11
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    Dissipation of electric fields in the ionosphere (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The heating and movement of the upper atmosphere at ionospheric levels in response to electric currents are discussed. Joule dissipation, generation of winds, and pressure gradients are significant factors in the energetics of the ionospheric electric currents flowing during magnetic storms and also of the Sq current system.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Phys. of the Space Environment; p 25-40
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  • 12
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    Antenna drive system for the Nimbus satellite (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: A two-axis drive system is described for pointing a high gain antenna. Motion about each axis is provided by identical drive mechanisms. Only three gear passes are required to obtain the necessary 900:1 gear reduction. The drive system is a primary element of an experiment that will provide a real time data link between Nimbus and ground stations. Data are transmitted from Nimbus to the applications technology satellite, which relays the data to ground stations.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 117-120
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  • 13
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    The Intelsat 4 antenna positioner (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The Intelsat 4 communications satellite has two spot beam antennas which are pointed to selected land masses by gimbaled positioners. The positioners employ drive motors with electromagnetic brakes and jackscrews that are self-caging during the launch. The positioner uses dry lubricants for ball bearings, spur gears, screw and nut, and various journal bearings. A coefficient of friction of approximately 0.05 was demonstrated in vacuum operation. Success of the positioner was demonstrated on the first Intelsat 4 placed in orbit in January 1971. The developmental problems that were encountered and their solutions are discussed.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 109-116
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  • 14
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    Nimbus observation of oceanic upwelling (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: Observing the development of upwelling on the northeast coast of Africa by measuring ocean surface emission with infrared radiometers on Nimbus satellites is reported. Using the temperature of the ocean as telemetered by the satellite, the biological potential of an area is estimated, and consequently the highest potential for fisheries.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 14-17
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  • 15
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    Locations of solar radio bursts (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: Measurements of the positions of the sources of solar radio bursts at decameter wavelengths, 20- to 60-MHz range, provide information about physical conditions in a region of the corona extending from about one-half to several solar radii from the surface of the sun. Position measurements in the 20- to 60-MHz range were made with the Clark Lake sweep-frequency grating interferometer. Although the resolution of the instrument is sufficient to measure source position accurately, the highly variable effect of refraction in the earth's ionosphere severely limits the observations, distorting position determinations to such an extent as to make much of the position data useless unless ionospheric refraction can be taken into account. A method was developed for the removal of the refractive effect from the data to permit determination of true source position. With this technique it is considered possible to measure spatial extent of radio sources that will provide information about emission processes and physical parameters in the corona.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Significant Accomplishments in Sci., 1970; p 149-153
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  • 16
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    Microwave emission of Arctic Sea ice (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The feasibility of carrying microwave radiometers on Nimbus E and F missions for sea ice surveys was studied in the arctic using aircraft. It was found that passive microwave signatures of Arctic Sea ice relate specifically to the structure and type of ice. It is concluded that a new tool for conducting ice surveys from aircraft and satellites with remote sensors was discovered.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 18-21
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  • 17
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    Electron impact ionization of H (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The results of theoretical calculations for the reactions between electrons and negative hydrogen atoms are discussed for an electron colliding with a negative hydrogen ion and neutralizing the hydrogen ion by stripping the loosely bound electron from it, and the two free electrons moving away. A semi-quantum description of the process is presented in which the target is described in terms of quantum mechanics, and the projectile electron is described in a classical fashion.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 58-62
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  • 18
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    Geological features in Wyoming from Nimbus 1 (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The identification of ground features in Nimbus photography by comparisons with geology, soils, and vegetation maps is discussed for the Wyoming-Colorado area. It is concluded that in a semiarid region, high topographic relief shows good coassociation with exposed geology and with vegetation and, to a lesser degree, with soils types. In lower, flatter basins, most tonal patterns are related to subtle variations in soil color and vegetation cover. It is thought that maps based on spectral parameters as the proper descriptor of surface features may be required.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 2-7
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  • 19
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    Reduction of near-in sidelobes using phase reversal aperture rings (1972)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: A technique is described for reducing near-in sidelobes in spacecraft antennas by cancellation. This technique takes a small portion of the radiation from the antenna aperture and generates the near-in lobes, which are then fed out of phase relative to the main signal. Results of sample cases indicate that the first three lobes can be nearly eliminated at a 40% reduction in aperture efficiency.
    Schlagwort(e): COMMUNICATIONS
    Materialart: JPL Quart. Tech. Rev., Vol. 1, No. 4; p 34-42
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  • 20
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    Electromagnetic compatibility fundamentals applied to spacecraft radio communication systems (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: A design guide for minimizing electromagnetic interference in aerospace communication equipment for ground stations is presented. Specifically treated are the mechanisms of generating unwanted radio emissions that may affect station operations as well as other communications services, the mechanisms by which sensitive receivers become susceptible to interference, means for reducing interference, standard methods of measurement, and the problems of site selection. The sources of interference are viewed primarily as originating from communications transmitters aboard spacecraft and aircraft, ground transmitters within and outside the ground stations, and other electrical sources on the ground that are not intended to radiate.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. Goddard Space Flight Center Radio Freq. Interference Handbook; p 1-106
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  • 21
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    Experiment T001: Entry communication on the Gemini 3 mission (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: Water addition to the Gemini 3 exhaust plasma was studied to determine its effectiveness in the establishment of communication links during the entry portion of the flight. Attenuation levels were measured with and without water injection at uhf frequencies of 230.4 and 296.8 megahertz and at the C-band frequency of 5690 megahertz. Ultrahigh frequency signals that had been blacked out were restored to significant levels, during early portions of the water-injection sequence, by the high flow rate injection. The C-band signal was enhanced by medium and high flow rate injections during the latter portion of the injection period. The uhf signal recovered during water injection resulted in an antenna pattern that was beamed in the radial direction of injection from the spacecraft. Postflight analysis showed that the uhf recovery data were consistent with injection-penetration theory.
    Schlagwort(e): COMMUNICATIONS
    Materialart: The Gemini Porgram: Phys. Sci. Expt. Sum.; p 471-485
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  • 22
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    On the heterodyne method of detecting gravitational waves (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: A mathematical model on the heterodyne method of detecting gravitational waves is presented, using a dumbbell consisting of two masses situated in a plane and a plane-fronted gravitational wave traveling perpendicular to the plane. It is concluded that the detector sensitivity is not likely to be improved without employing very complicated and expensive super low temperature techniques.
    Schlagwort(e): GEOPHYSICS
    Materialart: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 45-46
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  • 23
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    Ground truth versus no ground truth (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The area of study was the southeastern Arizona test site and three areas within the site were studied in detail: Safford, Point of Pines, and Fort Apache-White River. These areas have terrain contrast ranging from flat arid regions to high alpine mountains. Data were obtained from the Apollo 9 photographic missions, high altitude aerial photography, and simulated ERTS-A data from high altitude aircraft. Various monoscopic and steroscopic devices were used to analyze the features, and film density variations were studied. No ground-based data were permitted. Thematic maps were prepared for geology, geomorphology, vegetation, hydrology, and soils. Interpreted boundaries were delineated, with no collaborative data used in the interpretation. Ground-based data were gathered during the overflight of high altitude aerial photography. A further study was made using the ground truth, and the data gathered on the ground were compared with original mapping. 80% to 85% of the interpretations in the areas checked were correct. It was proved that it is possible to monitor gross features of the vigor of crop lands and vegetative cover, to type soils and classify geologic features, and to determine hydrologic conditions.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 3 p
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  • 24
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    Preprocessing of multispectral data and simulation of ERTS data channels to make computer terrain maps of a Yellowstone National Park test site (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The possibility of improving the accuracy of terrain classification by preprocessing spectral data was investigated. Terrain maps were made using the following techniques: 1) preprocessing by scan angle function transformation, using the computer-selected best set of three channels; and 2) preprocessing by ratio transformation, using the specified ERTS data channels, simulated by fitting the spectral response of each of the 12 data channels to the ERTS channels by a set of weighting coefficients. By using a simple technique during printout, the maps were produced in color. The normalized scan angle function transformation resulted in the most accurate classification. The best ratio transformation for the Yellowstone Park data was the ratio of each channel to the sum of all channels. A supervised training program involving maximum likelihood decision for selecting the best spectrometer channels and similar techniques for digitizing the data of the analog magnetic tapes were used. Cloud shadows were recognized in addition to eight classes of terrain. Preprocessing of data resulted in more accurate maps, required fewer training areas (hence less preparation and computer time), and enabled much of the area formerly classified as shadow to be reclassified according to actual terrain type.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1.; 25 p
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  • 25
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    Regional land use studies (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: Remote sensing technology and data from instrumented satellites and high altitude aircraft are proposed for mapping land use on a current national basis, for monitoring changes and trends, and for creating statistical models which can be manipulated to demonstrate the probable effects of proposed land use and of environmental changes over large areas. Both Apollo spacecraft and aircraft photography were used; the spacecraft pictures delineated the cropland and urban boundaries more clearly. A computer model is also proposed for statistical analysis and for printing out updated maps automatically; this model will include a data bank which can be updated rapidly with changes detected by the computer.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 9 p
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  • 26
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    Investigations on a cylindrical antenna as a diagnostic probe for isotropic and magnetized plasmas (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Impedance behavior of short cylindrical antenna used as diagnostic probe in isotropic and magnetized plasmas
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 47-56
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  • 27
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    Communications control group assembly - Teletype line switching equipment (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Communications control group teletype line switching equipment for space stations
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 113-116
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  • 28
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    Antenna rigging angle optimization within structural member size design optimization (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Antenna rigging angle optimization within structural member design for improved antenna performance
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 81-87
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  • 29
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    Antenna structures - Evaluation of reflector surface distortions (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Reflector surface distortions of 210 ft antenna and their effects on radio frequency performance
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 76-80
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  • 30
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    Tracking and data acquisition elements research - Polarization diverse S band feed cone (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Polarization diverse S band feed cone for DSIF reflector antennas
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 66-72
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  • 31
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    A second/third order hybrid phase locked receiver for tracking Doppler rates (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Second/third order hybrid phase locked receiver for tracking frequency ramp signals
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 42-45
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  • 32
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    Refractivity influence on DSS Doppler data (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Examination of deep space Doppler data for terrestrial media contamination
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 31-41
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  • 33
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    A cursory examination of the sensitivity of the tropospheric range and Doppler effects to the shape of the refractivity profile (1971)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Ray tracing techniques for examination of refractivity profile sensitivity in tropospheric range and Doppler effects on profile shape
    Schlagwort(e): GEOPHYSICS
    Materialart: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 22-30
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  • 34
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    The effects of spatial nonuniformities on high temperature microwave breakdown (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Effects on high temperature microwave antenna breakdown of ionization frequency, collision frequency, diffusion coefficient, and breakdown parameters
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 489-508
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  • 35
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    An automatic antenna impedance matcher for reentry vehicle applications (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Impedance matcher for automatically maximizing power radiated from X band antenna on reentry vehicle by eliminating power dissipated as heat
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 449-463
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  • 36
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    Electromagnetic wave propagation in a lossy plasma slab with a gradient transverse to the incident wave (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-27
    Beschreibung: Computer solution of plane electromagnetic wave interaction with bounded inhomogeneous plasma slab with electron density gradient transverse to wave
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 427-448
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  • 37
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    Radiation from circumferential slots on plasma-clad cones (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Slot antenna radiation pattern distortion produced by boundary layer plasma sheath around conical reentry vehicles
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 411-425
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  • 38
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    Antenna performance in the presence of a turbulent plasma (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Antenna radiation patterns and electron density profiles in turbulent plasma flow
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 379-410
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  • 39
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    Effects of reentry plasma on RAM C-1 VHF telemetry antennas (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Reentry plasma effects on RAM C-1 VHF telemetry antenna radiation patterns
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 183-201
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  • 40
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    Shock tube measurement of admittance of RAM C and RAM C-C diagnostic antennas (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Shock tube measurements of admittance of RAM C-2 and RAM C-3 diagnostic antenna admittance to analyze accuracy of calculated electron density
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 157-182
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  • 41
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    RAM C-3 S-band diagnostic experiment (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: RAM C-3 S band diagnostic antenna systems and calculations of electron density profiles
    Schlagwort(e): COMMUNICATIONS
    Materialart: THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 137-155
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  • 42
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    Communications system research (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-27
    Beschreibung: Coding, synchronization, combinatorial, multiple access, propagation, and permutation studies for telecommunications systems
    Schlagwort(e): COMMUNICATIONS
    Materialart: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 25-89
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  • 43
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    Television experiment (1973)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The fixed and variable Martian features investigated by the TV experiment on Mariner 9 are described. Articles are presented concerning the dust storm of October to November over the Southern Hemisphere; global surface geodesy and cartography; geology; and the satellite astronomy.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Mariner Mars 1971 Proj., Vol. 5; p 63-70
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  • 44
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    Bearing strength of the lunar soil (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: A discussion is presented on the bearing strength and bearing load-penetration relations in lunar soil. These were measured in air as a function of bulk density. It was found that the relation between bulk density and the logarithm of the bearing capacity is about linear. Shapes of the load vs penetration curves were observed to be similar to those obtained with particulate material of terrestrial origin.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Analysis of Surveyor 3 Mater. and Phot. Returned by Apollo 12; p 227-232
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  • 45
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    The Goddard helical tape recorder (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: A spacecraft recorder was developed with the objective of functioning continuously for 5 years. The resulting design employed a metallic tape wound in a 200-turn helix. A direct drive, brushless dc torquer and servo speed control drove the recorder at 3 rpm for recording and 54 rpm for playback.
    Schlagwort(e): COMMUNICATIONS
    Materialart: 6th Aerospace Mech. Symp.; p 89-93
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  • 46
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    Comparison of probe and radar ionosphere temperatures (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The discrepancy in temperature measurements of ionospheric electrons by Langmuir electrostatic probes, and radar backscatter are discussed. The discrepancy occurs at altitudes from 350 to 800km, and the probe temperatures are consistantly higher than the radar temperatures. It is concluded that the non-Maxwellian energy distribution provides an explanation for the altitude and the lower radar temperatures.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 43-45
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  • 47
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    Microwave measurements of sea state (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Passive microwave measurements were studied for determining sea state. It was found that the brightness temperature increases due to the foam produced by winds, and that the surface wind can be determined by the brightness temperature.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 22-27
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  • 48
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    Bias and spread in extreme value theory measurements of probability of error (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Extreme value theory is examined to explain the cause of the bias and spread in performance of communications systems characterized by low bit rates and high data reliability requirements, for cases in which underlying noise is Gaussian or perturbed Gaussian. Experimental verification is presented and procedures that minimize these effects are suggested. Even under these conditions, however, extreme value theory test results are not particularly more significant than bit error rate tests.
    Schlagwort(e): COMMUNICATIONS
    Materialart: JPL Quart. Tech. Rev., Vol. 1, No. 4; p 58-68
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  • 49
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    An Eotvos experiment in earth orbit (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The gravitational interactions of mass energy stored in the weak interaction are being investigated. The magnitude of possible Eotvos anomalies, such as weak interaction, gravitational self-energy, spin-orbit interactions, and electromagnetic radiation reaction, are considered. A sensitive experiment was designed to determine whether weak interaction energy violates the equivalence principle. Factors to be considered in spacecraft design for the experiment are presented.
    Schlagwort(e): GEOPHYSICS
    Materialart: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 228-235
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  • 50
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    The use of the Earth-Moon system as a radio tracking facility (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The use of the earth-moon system for radio tracking has several potentially useful aspects, from a scientific standpoint: extension of the baseline by two orders of magnitude, absence of lunar atmosphere, higher-velocity parallax with a longer period, and the moon's more modellable rotation. The facility would be a convenient base station for other research, not directly involving the tracking capability, but utilizing its orbiting data link features.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 249-251
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  • 51
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    Observations of earth eigen vibrations possibly excited by low frequency gravity waves (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: A cryogenic gravity meter made of two parts, a magnetic suspension unit and a detection module, was used to monitor earth eigen vibrations. The magnetic field and field gradient are generated by energizing a set of superconducting coils made of niobium-zirconium alloy wire. The detection module is a double Josephson junction magnetometer. The output is printed on a chart recorder and later digitized using a computer; a Fourier transformation is performed on the accumulated data. The measurements of eigen vibrations are summarized in tabular and graphical representations.
    Schlagwort(e): GEOPHYSICS
    Materialart: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 47-53
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  • 52
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    Experiment M405: Tri-axis flux gate magnetometer (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: A tri-axis flux-gate magnetometer was used on four Gemini spacecraft for determination of the magnitude and direction of the local geomagnetic field with respect to the spacecraft. Conclusions derived from the data are not only important to the proton-electron spectrometer experiment, but also are of significance to any directional charged particle experiments that may be conducted. Even though the Gemini spacecraft was not clean magnetically, the data could be reduced to a form that supplied directional information on the magnetic field in relation to the spacecraft. Stray fields were the result of spacecraft structure, not the result of current flows that were produced within the spacecraft electrical systems. Efforts were made to reduce spacecraft stray fields and to facilitate the acquisition of more accurate data.
    Schlagwort(e): GEOPHYSICS
    Materialart: The Gemini Program: Phys. Sci. Expt. Sum.; p 153-168
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  • 53
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    ESRO study program for a space experiment on gravitation theories (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: ESRO is considering a space experiment which is the definition phase. A more complete utilization of space techniques, leading to highly accurate acceleration measurements in a heliocentric spacecraft, together with an improved laser signal propagation method (using a space-borne atomic clock), could substantially increase the validity of the gravitational time delay test during solar conjunction. Preliminary investigations of the primary required techniques were carried out. These studies included an orbit analysis, investigation of drag-free techniques, and studies of the time measuring instrument. These studies were used to define the framework of a space experiment on gravitation theories. A preliminary feasibility study of the mission is being undertaken.
    Schlagwort(e): GEOPHYSICS
    Materialart: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 236-241
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  • 54
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    Radio tracking with the Deep Space Network (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Range and Doppler measurements for the Mariner 6 and 7 spacecraft are described. The Doppler tracking system and the two systems of spacecraft ranging apparatus being used in the Deep Space Network are illustrated. Charged particle calibration is considered. Equipment characteristics are presented for the ranging apparatus.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 158-165
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  • 55
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    Testing general relativity: Progress, problems, and prospects (1971)
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    Publikationsdatum: 2005-11-30
    Beschreibung: The results from ground-based experimental testing are presented. Prospects for improving these experiments are discussed. Radar echo time delays, perihelion advance and solar oblateness, time variation of the gravitational constant, and radio wave deflection are considered. Ground-based and spacecraft techniques are compared on an accuracy vs. cost basis.
    Schlagwort(e): GEOPHYSICS
    Materialart: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 136-147
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  • 56
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    Experiment Do14: Ultrahigh and very high frequency polarization (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The measurement of inhomogeneities in the electron content along the orbital paths of Gemini 8 and Gemini 9 missions was not accomplished because the tracking information was not available. The use of ultrahigh frequency radio transmission was the primary factor in the successful removal of a very high frequency Faraday rotation ambiguity; but, as was expected, this was not very useful for fine-scale polarization studies. Ionosonde data were useful in the computation of the slab thickness at the closest point of approach of the spacecraft.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. Manned Spacecraft Center The Gemini Program: Phys. Sci. Expt. Sum.; p 487-507
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  • 57
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    Spacecraft telecommunications systems - A digital command system development (1970)
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    Publikationsdatum: 2005-11-27
    Beschreibung: All digital, single channel command subsystem for spacecraft communication
    Schlagwort(e): COMMUNICATIONS
    Materialart: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 126-129
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  • 58
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    Applied mechanics (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-27
    Beschreibung: Spacecraft antenna optimization, receptance coupling program, deformation modes and dynamic response of structures, and holographic measurements
    Schlagwort(e): COMMUNICATIONS
    Materialart: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 171-190
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  • 59
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    Calibration of radar data from Apollo 16 results, part X (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Predictions of surface and near surface blockiness using earth based radar measurements were made. Two polarizations of the radar echoes were measured - polarized and depolarized. Particular attention was given to the depolarized echoes. North Ray and South Ray Craters and a 512-m diameter lunar crater in the Flamsteed Ring were used for the study.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. Lyndon B. Johnson Space Center Apollo 16 Prelim. Sci. Rept.; 3 p
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  • 60
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    Bistatic-radar investigation (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The purpose of the reported experiment was to determine the principal electromagnetic and structural properties of the lunar surface from the observation of command and service module (CSM) radio transmissions that were reflected from the lunar surface and received on earth. These transmissions emanate from the CSM communication systems at wavelengths of 13 cm (S-band) and 116 cm (very high frequency (VHF)). Lunar crustal properties such as dielectric constant, average slope and slope probability, density, small-scale surface roughness, and embedded rocks to a depth of 20 m may be determined. The results are proving to be most useful in understanding the processes that have produced and modified the crust and in distingushing between adjacent and subjacent geological units. The experimental observations are also of intrinsic interest in the study of electromagnetic scattering.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. Lyndon B. Johnson Space Center Apollo 16 Prelim. Sci. Rept.; 13 p
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  • 61
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    The energy balance of wind waves and the remote sensing problem (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Measurements of wave growth indicate an energy balance of the wave spectrum governed primarily by input from the atmosphere, nonlinear transfer to shorter and longer waves, and advection. The pronounced spectral peak and sharp low frequency cut-off characteristic of fetch-limited spectra are explained as a self-stabilizing feature of the nonlinear wave-wave interactions. The momentum transferred from the atmosphere to the wind waves accounts for a large part of the wind drag. These findings are relevant for remote microwave sensing of the sea surface by backscatter and passive radiometry methods.
    Schlagwort(e): GEOPHYSICS
    Materialart: NOAA Sea Surface Topography from Space, Vol. 2; 55 p
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  • 62
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    Comments on ocean circulation with regard to satellite altimetry (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Basic features of sea surface topography are reviewed, to show those oceanographic results which may be of value to a geodetic satellite program: (1) the shape and magnitude of the large scale features of the mean sea surface, relative to a level surface; (2) the position and magnitude of the slopes across the western boundary currents, from a variety of data; (3) an estimate of the position of the geoid, tied into the U.S. leveling network; and (4) a documented change of 60 to 70 cm in mean sea level, with respect to the geoid, between the U.S. east and west coasts.
    Schlagwort(e): GEOPHYSICS
    Materialart: NOAA Sea Surface Topography from Space, Vol. 2; 17 p
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  • 63
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    The stable auroral red arc of October 31 - November 1, 1968 and its interaction with the neutral atmosphere (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Satellite observations of electron temperature and the topside electron density structure are used to calculate the red arc according to the thermal conduction model. In this model, energy from the magnetosphere flows in the electron gas along geomagnetic field lines into the ionosphere. This energy heats the ambient F-region electrons sufficiently to excite the oxygen atoms to the O I(1D) level by collisional impact giving rise to the 6300 A emission characteristic of the arc. For the 31 October/1 November 1968 red arc, the calculated emission rate, geographical position, and horizontal extent of the red arc are in agreement with the photometric data obtained by airglow observatories. Almost all of the energy conducted into the red arc is ultimately transferred to the neutral gas through elastic and inelastic collisions. This energy drives a large thermal cell and the circulation extends the influence of the arc thousands of kilometers beyond the region of direct heat input. The calculated neutral gas temperature response to electron heating within the arc is small.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Phys. of the Space Environment; p 45-69
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    The composition of the upper atmosphere (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Miniature mass spectrometers were developed and were carried on sounding rockets to determine the composition of the upper atmosphere. Techniques have been developed that accurately correct for the velocity and spin of the moving vehicle. Above 120 km N2, O2, and Ar appear to be in diffusive equilibrium. Most He concentration measurements show a more rapid decline with altitude than predicted by diffusive equilibrium. Because of the highly reactive nature of atomic oxygen, measurements of this species by mass spectrometry are low by an unknown factor.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Phys. of the Space Environment; p 129-145
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  • 65
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    Hydrology of the Niger River from Nimbus HRIR (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The seasonal changes in aspect of the Niger River in the Republic of Mali, West Africa, as seen in daytime imagery obtained by the high-resolution infrared radiometer on Nimbus 3 are described. The identification of different plants by their reflectance is shown to provide an ecological map that changes with time. It is concluded that Nimbus imagery provides an integrated view of the entire watershed on a daily basis.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 8-13
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  • 66
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    Air-sea interaction in the Pacific Ocean (1972)
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    Publikationsdatum: 2005-11-30
    Beschreibung: Daily Tiros and ESSA satellite television nephanalysis over the Pacific Ocean were collected, and monthly cloud charts drawn to study the interaction of tropical oceans with the atmosphere. The data were correlated with climatological data for rainfall and surface temperatures.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 28-31
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    Reginal Geology of Hadley Rille, part F (1972)
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    Publikationsdatum: 2005-11-30
    Beschreibung: Local geology of Hadley Rille near the landing site of Apollo 15 is described. Orbital photography from the Hasselblad, metric, and panoramic cameras is used to study regional relationships of the rille. The shape of the rille due to various natural causes is examined, along with stratigraphic measurements of mare materials.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center Apollo 15 Prelim. Sci. Rept.; 5 p
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    Surface disturbances at the Apollo 15 landing site, part E (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: High resolution panoramic photographs taken from 110 km orbits of the command service module show the lunar module structure on the moon as evidenced by reflected light and by the shadow. Before and after photographs of the landing site are presented; the increased brightness or halo is attributed to mare surface materials.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center Apollo 15 Prelim. Sci. Rept.; 3 p
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    Linear geologic structure and magic rock discrimination as determined from infrared data (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Color infrared photographs of the Beartooth Mountains, Montana show the distribution of mafic dikes and amphibolite bodies. Lineaments that cross grassy plateaus can be identified as dikes by the marked constrast between the dark rocks and the red vegetation. Some amphibolite bodies in granitic terrain can also be detected by infrared photography and their contacts can be accurately drawn due to enchanced contrast of the two types of rock in the near infrared. Reflectance measurements made in the field for amphibolite and granite show that the granite is 25% to 50% more reflective in the near infrared than in the visible region. Further enhancement is due to less atmospheric scattering than in the visible region. Thermal infrared images of the Mill Creek, Oklahoma test site provided information on geologic faults and fracture systems not obtainable from photographs. Subtle stripes that cross outcrop and intervening soil areas and which probably record water distribution are also shown on infrared photographs.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 12 p
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    Experimental applications of multispectral data to natural resource inventory and survey (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The feasibility of using multispectral, color, color infrared, thermal infrared imagery and related ground data to recognize, identify, determine and monitor the status of mineral ore and metals stockpiles is studied. An attempt was made to identify valid, unique spectral signatures of such materials for possible use under a wide variety of environmental circumstances. Research emphasis was upon the analysis of the multiband imagery from the various film-filter combinations, using density analysis techniques.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 33 p
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  • 71
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    Introductory comments on the USGS geographic applications program (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The third phase of remote sensing technologies and potentials applied to the operations of the U.S. Geological Survey is introduced. Remote sensing data with multidisciplinary spatial data from traditional sources is combined with geographic theory and techniques of environmental modeling. These combined imputs are subject to four sequential activities that involve: (1) thermatic mapping of land use and environmental factors; (2) the dynamics of change detection; (3) environmental surveillance to identify sudden changes and general trends; and (4) preparation of statistical model and analytical reports. Geography program functions, products, clients, and goals are presented in graphical form, along with aircraft photo missions, geography test sites, and FY-70.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 5 p
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  • 72
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    Tests of the equivalence principle and gravitation theory using solar system bodies (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The M sub g/M sub i ratio (ratio of body acceleration to gravitation field) of celestial bodies was measured. Deep probes of the post-Newtonian structure of gravitational theories are indicated. Kepler's third law is considered for the Sun-Jupiter system.
    Schlagwort(e): GEOPHYSICS
    Materialart: JPL Proc. of the Conf. on Exptl. Tests of Gravitation Theories; p 32-37
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    A review of application studies on Indian lands using NASA aerospace imagery (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Three remote sensing projects are being conducted on three different Indian reservations in eastern Arizona. On the Fort Apache Reservation, a multiband thermal and false color sensing of an Englemann spruce beetle infestation is being investigated on Mount Baldy, adjacent to a U.S. Forest Service proposed wilderness area. On the San Carlos Reservation, there is a joint USGS, EROS, and San Carlos tribe project to examine intensively a circular topographic feature noted on the Apollo 9 imagery. On the Papago Reservation, an EROS-funded contract will provide the Papago tribe with a report showing potential mineral areas, by comparing and correlating space imagery with high resolution imagery and aeromagnetic data.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 6 p
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  • 74
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    Geologic interpretation of Apollo 6 stereophotography from Baja California to west Texas (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Excellent space photography of parts of the southwestern United States and northwestern Mexico was obtained during the unmanned Apollo 6 spaceflight. Two features of this photography made it useful for geologic interpretations: its vertical stereocoverage and its exposure under a relatively low angle of solar illumination through an unusually cloud-free and clear atmosphere. The structural patterns, which were topographically enhanced by the longer shadows, were annotated on the photographs, in order to analyze their trends with respect to the continental tectonic framework, and to attempt to correlate the pattern with known copper or other base metal deposits. The annotated fracture patterns showed the regional trends and their distribution. The area studied was a 100- to 105-mile swath of terrain covering a total land area of approximately 60,000 square statute miles. The coverage began from a point centered on Punta Colnett on the Pacific coast of Baja California and extended to the Sacramento Mountains of New Mexico and west Texas.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 25 p
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  • 75
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    A study of passive microwave techniques applied to geologic problems (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Passive microwave techniques were applied to geologic problems, in order to establish the microwave properties of representative rocks and minerals, and to examine the feasibility of using microwave radiometry for geologic mapping problems. A review of microwave pertaining to geology was conducted, coupled with laboratory and field investigations of the microwave emission characteristics of various geologic features. The laboratory studies consisted of dielectric constant measurements of rocks and minerals. A majority of field investigations conducted in the western United States, involved the microwave emission charateristics of rock types, and a portion of the study was concerned with microwave properties of mineralized areas. Experiments were also conducted in the vicinity of a coal seam fire in Colorado and across the San Andreas Fault Zone near the Salton Sea, in Southern California.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 12 p
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  • 76
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    Geography program, design, structure and operational strategy (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The geography program is designed to move systematically toward a capability to increase remote sensing data into operational systems for monitoring land use and related environmental change. The problems of environmental imbalance arising from rapid urbanization and other dramatic changes in land use are considered. These overall problems translate into working level problems of establishing the validity of various sensor-data combinations that will best obtain the regional land use and environmental information. The goal, to better understand, predict, and assist policy makers to regulate urban and regional land use changes resulting from population growth and technological advancement, is put forth.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spececraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 9 p
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  • 77
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    Environmental application of remote sensing methods to coastal zone land use and marine resources management (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-30
    Beschreibung: The interrelationships of biophysical environmental systems are investigated. Social decision-making affecting the environments of a coastal megapolis are examined. Remote sensing from high altitude aircraft and satellites afforded a powerful and indepensible tool for inventory and planning for urban development. Repetitive low to medium altitude photography is also used for studying environmental dynamics, and to document the cultural impact of man on his environment.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 9 p
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  • 78
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    Electromagnetic compatibility design guideline for STADAN (1971)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Procedures for achieving electromagnetic compatibility in electronic and electrical equipment for aerospace ground stations are investigated. The application of shielding theory to good design is treated and standards of good practice are outlined for bonding, grounding, wiring, and cabling. Some aspects of filter design are explained, and suggestions are given for the application of filters to electronic and electrical equipment.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA Goddard Space Flight Center Radio Freq. Interference Handbook; p 107-198
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  • 79
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    Overview of the AF Avionics Laboratory reentry electromagnetics program (1970)
    In:  CASI
    Details
    Publikationsdatum: 2005-11-27
    Beschreibung: Radio wave propagation through plasmas studied for communication with hypersonic vehicles during reentry
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. LANGLEY RES. CENTER THE ENTRY PLASMA SHEATH AND ITS EFFECTS ON SPACE VEHICLE ELECTROMAGNETIC SYSTEMS, VOL. 1 1970; P 3-17
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  • 80
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    Communications elements research (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-27
    Beschreibung: Components and techniques for radio and optical space communication
    Schlagwort(e): COMMUNICATIONS
    Materialart: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 90-120
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  • 81
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    Spacecraft radio - TOPS radio frequency subsystem (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-27
    Beschreibung: Radio frequency subsystem requirements and estimated reliability data for Thermoelectric Outer Planet Spacecraft
    Schlagwort(e): COMMUNICATIONS
    Materialart: SPACE PROGRAMS SUM. NO. 37-61, VOL. 3 28 FEB. 1970; P 121-125
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  • 82
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    Evolution of a spacecraft antenna system (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-27
    Beschreibung: Mechanically despun antenna system design for spin stabilized spacecraft used in ATS and Intelsat systems
    Schlagwort(e): COMMUNICATIONS
    Materialart: JPL PROC. OF THE 4TH AEROSPACE MECH. SYMP. 15 JAN. 1970; P 13-18
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  • 83
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    Tides and tsunamis (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Although tides and tsunamis are both shallow water waves, it does not follow that they are equally amenable to an observational program using an orbiting altimeter on a satellite. A numerical feasibility investigation using a hypothetical satellite orbit, real tide observations, and sequentially increased levels of white noise has been conducted to study the degradation of the tidal harmonic constants caused by adding noise to the tide data. Tsunami waves, possibly a foot high and one hundred miles long, must be measured in individual orbits, thus requiring high relative resolution.
    Schlagwort(e): GEOPHYSICS
    Materialart: Sea Surface Topography from Space, Vol. 2; 30 p
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  • 84
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    Radar augmentation device (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The radar augmentation device (RAD) serves to increase the radar response of a target body and thus expedite radar acquisition. The design and development of the RAD are discussed with particular emphasis on technical problems that were encountered and solved. Discussions of the mode of operation of the RAD and the ground test history are also included.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA. Ames Res. Center 6th Aerospace Mech. Symp.; p 65-72
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  • 85
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    Cracking of the lunar soil (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Rather than a pattern of cracks in an apparently flat surface, the Apollo 12 photographs suggest an irregular surface that consists of clods or fragments. The impression of flat tiles and crusting, obtained by monoscopic viewing, is an illusion. Instead, the lunar soil deforms and cracks in the same manner as homogeneous isotropic terrestrial soils of moderate bulk density, having a small amount of cohesion.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Analysis of Surveyor 3 Mater. and Phot. Returned by Apollo 12; p 233-235
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  • 86
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    Magnetospheric radio noise (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Observations, made by the RAE satellite, of earth magnetospheric noise are reported. The observations show radio noise exists at 700 kHz and below. The results are included in graphs.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Significant Accomplishments in Sci., 1970; p 75-80
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  • 87
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    Preliminary geologic map of the region around the candidate Proclus Apollo landing site, part J (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The Proclus Crater region was mapped to test the value, for photogeologic mapping purposes, of Apollo 15 metric photographs and to estimate the scientific value of the area as a potential landing site. Adjacent frames of the metric photography were overlapped with the base frame to provide stereographic images. Because of the high quality of the photographs, it was found that the geologic units could be more definitely interpreted and dated than those of earlier maps. The photographs tend to confirm the earlier interpretation of the rugged area as composed of bedrock uplifted when the Crisium basin formed. They also suggest that an earlier predominantly volcanic interpretation of the terra in this area might be replaced by an interpretation in which mass wasting and fracturing play the major roles in producing different terrain types. It was concluded that because of apparent lithologic homogeneity, the terra of the Proclus region is an undesirable objective for an extensive manned lunar landing mission.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center Apollo 15 Prelim. Sci. Rept.; 4 p
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  • 88
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    Magnetospheric boundaries (1972)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The location of the outer boundary of the geomagnetic field, or magnetopause, and the location of the earth's bow shock have been compiled based on data from the first six IMP satellites.
    Schlagwort(e): GEOPHYSICS
    Materialart: Significant Accomplishments in Sci., 1970; p 81-85
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  • 89
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    Relationship between vegetation reflectance spectra and soil geochemistry: New data from Catheart Mountain, Maine (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Spectral reflectance curves for red spruce and balsam fir in the 350- to 1100-nanometer region showed differences between specimens growing over and away from a concealed copper deposit at Catheart Mountain, Maine. A sample group of 15 anomalous spruce, 9 background spruce, 10 anomalous fir, and 10 background fir was studied. Measurements of copper and molybdenum contents in the supporting soil were used to categorize the trees as anomalous or background. Analyses using parametric and nonparametric statistical tests were performed to establish whether significant differences existed between the anomalous and background groups. At the 95% confidence level, significant differences were found to exist for both species, generally in the chlorophyll band centered at about 550 nanometers and in the region from 700 to 900 nanometers.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 9 p
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  • 90
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    Remote sensing in marine geology: Arctic to Caribbean (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The applications of remote sensing to coastal dynamics of both nearshore and offshore waters are discussed. Results of aerial photographic analysis of four areas are presented. The study areas include the Arctic (Beaufort Sea), the Pacific Northwest, San Francisco Bay, and St. John, Virgin Islands (Project Tektite).
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 17 p
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  • 91
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    Multispectral analysis of limestone, dolomite, and granite, Mill Creek, Oklahoma (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Spectral reflectance and thermal emission data were collected at the Mill Creek, Oklahoma test site during NASA missions 132 and 133 in June 1970. The data were collected by three aircraft flown several times during the diurnal cycle at altitudes of 150 to 17,000 m above mean terrain. Reflectance of the main rock types (limestone, dolomite, and granite) was determined from the data collected using a 12-channel multispectral scanner during mission 133 and from thermal infrared images recorded during mission 132 on an RS-7 scanner from 17,000 m above terrain. A preliminary rock recognition map was generated automatically using data collected from 900 m above terrain. The discrimination provided by the map is reasonably accurate. Misidentification occurred in areas of unusually high dolomite reflectivity. High altitude thermal infrared (10 to 12 micrometers) images show regional folds and faults distinguished by the presence of thermally contrasting materials. Linear and curvilinear structural features two to three times smaller than the nominal 17 m resolution could be detected.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 114 p
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  • 92
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    Special projects of the geographic applications program (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: Alternative uses were investigated for the Mississippi Test Facility since the phaseout of Saturn 5 engine testing. Using the facility for collecting remotely sensed data is suggested for regional studies. The capabilities of various remote sensing devices to detect, identify, monitor, or determine effects of environmental pollution are summarized. Which pollutants could be monitored from spacecraft, high and low altitude aircraft, and ground based platforms are determined. Examples of special processing and enhancement and analysis techniques used in connection with remote sensing data are provided.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 7 p
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  • 93
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    Climatology of urban regional systems (1970)
    In:  CASI
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    Publikationsdatum: 2005-11-30
    Beschreibung: The combining of remote sensing technologies to urban-regional energy climatology is studied. It was found to be three dimensional with a mosaic urban surface, each smaller surface with its own radiant and thermal properties. Urban patterns of radiant exchange were found to be constantly changing during diurnal and annual cycles. Results were derived from Barbados data using remote methods for monitoring and mapping radiation. Isoline maps of terrestrial radiation patterns were made generalizing the minute patterns of the scan image.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 11 p
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  • 94
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    Geologic terrain mapping from earth-satellite and ultra-high aerial photographs (1970)
    In:  CASI
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    Publikationsdatum: 2005-01-18
    Beschreibung: A proposal is made for mapping from aerial photographs from the EROS program. Three kinds of maps (geomorphic or landform, soil, and surficial deposit) are being prepared at 1:250,000 scale for an 8000-square-mile area between Tucson and Ajo, Arizona. Nine cameras used on NASA mission 101 provided color, color infrared, and multispectral air photos from about 60,000 feet above the terrain and with photo scales ranging from 1:60,000 to 1:240,000. This area was selected because it provides a good sample of desert terrain and is suited for improving and testing the photointerpretive techniques for mapping geologic terrain features with small-scale photos.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., vol. 1; 5 p
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  • 95
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    Infrared scanning radiometer (1973)
    In:  CASI
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    Publikationsdatum: 2006-01-11
    Beschreibung: The Apollo 17 infrared scanning radiometer (ISR) experiment for mapping lunar surface thermal emission is reported. The instrument, lunar surface coverage, and the data obtained are discussed.
    Schlagwort(e): GEOPHYSICS
    Materialart: Apollo 17 Prelim. Sci. Rept.; 6 p
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  • 96
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    Lunar atmospheric composition experiment (1973)
    In:  CASI
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    Publikationsdatum: 2006-01-11
    Beschreibung: On the Apollo 17 mission, a miniature mass spectrometer, called the lunar atmospheric composition experiment (LACE), was carried to the moon as part of the Apollo lunar surface experiments package (ALSEP) to study the composition of and variation in the lunar atmosphere. The instrument was successfully deployed in the Taurus-Littrow valley with its entrance aperture oriented upward to intercept and measure the downward flux of gases at the lunar surface. Initial activation of the LACE instrument occurred on December 27, 1972, approximately 50 hr after sunset, and operation continued throughout the first lunar night. Sunrise brought a high background gas level and necessitated discontinuing operation during lunar daytime except for a brief check near noon. Near sunset, operation was resumed and continued throughout the night. This sequence was repeated for the second and third lunations.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Johnson Space Center Apollo 17 Prelim. Sci. Rept.; 9 p
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  • 97
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    Structure of proton centers and associated nonthermal bursts at microwave frequencies (1973)
    In:  CASI
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    Publikationsdatum: 2006-04-05
    Beschreibung: A very broad band of electromagnetic radiation is emitted during solar flares, especially at the explosive phase. The existence of a large variety of plasmas with various densities and a wide range of temperatures or energies is proposed as the initiating agent. The manner in which the plasmas are heated and accelerated to subrelativistic and relativistic energies is discussed. Observational evidence on the characteristics of active regions which produced proton flares and on the structure of the associated nonthermal microwave bursts of the sun is presented. The behavior of subrelativistic electrons on the sun is described.
    Schlagwort(e): COMMUNICATIONS
    Materialart: NASA, Washington High Energy Phenomena on the Sun; p 78-86
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  • 98
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    Atmospheric electricity (1973)
    In:  CASI
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    Publikationsdatum: 2006-04-02
    Beschreibung: Atmospheric electricity must be considered in the design, transportation, and operation of aerospace vehicles. The effect of the atmosphere as an insulator and conductor of high voltage electricity, at various atmospheric pressures, must also be considered. The vehicle can be protected as follows: (1) By insuring that all metallic sections are connected by electrical bonding so that the current flow from a lightning stroke is conducted over the skin without any gaps where sparking would occur or current would be carried inside; (2) by protecting buildings and other structures on the ground with a system of lightning rods and wires over the outside to carry the lightning stroke into the ground; (3) by providing a zone of protection for launch complexes; (4) by providing protection devices in critical circuits; (5) by using systems which have no single failure mode; and (6) by appropriate shielding of units sensitive to electromagnetic radiation.
    Schlagwort(e): GEOPHYSICS
    Materialart: Terrest. Environ. (Climatic) Criteria Guidelines for Use in Aerospace Vehicle Develop., 1973 Rev.; 28 p
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    Vibration resistance of the wire-feed mechanism of a magnetic recording apparatus (1973)
    In:  CASI
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    Publikationsdatum: 2006-03-28
    Beschreibung: The effects of external mechanical and climatic actions on the efficient operation of magnetic tape recording equipment are analyzed. The efficiency and reliability of the recording system are determined by the structural parameters and the characteristics of the individual elements of the transport mechanism circuit. The resistance of tape recording equipment to the effects of vibration is considered essential for reliable operations. Methods for insuring reliable tape transport and recording action are discussed.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 271-274
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    Measurement of irregularities in angular velocities of rotating assemblies in memory devices on magnetic carriers (1973)
    In:  CASI
    Details
    Publikationsdatum: 2006-03-28
    Beschreibung: Problems in measurement of irregularities in angular velocity of rotating assemblies in memory devices with rigid and flexible magnetic data carriers are discussed. A device and method for determination of change in angular velocities in various frequency and rotation rate ranges are examined. A schematic diagram of a photoelectric sensor for recording the signal pulses is provided. Mathematical models are developed to show the amount of error which can result from misalignment of the test equipment.
    Schlagwort(e): COMMUNICATIONS
    Materialart: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 279-282
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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