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  • 1
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    Fractionation effect in annealing of radiation damaged silicon (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Electron radiation damaged Si, investigating p type defect concentration effect on isochronal temperature in annealing by fractionation experiment
    Keywords: PHYSICS, SOLID-STATE
    Type: ; RNIER-POST (
    Format: text
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  • 2
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    Evidence that cosmic gamma-ray bursts are galactic (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Balloon observations registering scatter angles in a liquid scintillator have revealed gamma-ray bursts having energies as low as 10 to the -7th ergs per square cm. The burst distribution is graphed according to energy and frequency. The hypothesis that the bursts are galactic in origin is in good agreement with their small recorded energies and their predicted distribution on the graph.
    Keywords: ASTROPHYSICS
    Type: Nature; 271; Feb. 16
    Format: text
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  • 3
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    Search for broad gamma ray lines with the UCR double Compton scatter telescope (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The operation of a double scatter telescope and the evaluation of data obtained during a 24 hour balloon flight are discussed. An increase in gamma rays was observed as the galactic anti-center crossed the aperature of the telescope. Searches for lines from p(n,gamma)d at 2.2 MeV, C-12* at 4.4 MeV and on -16* at 6.1 MeV and for other lines broadened or redshifted are being conducted to identify the processes responsible for the production of celestial gamma rays. Two upper limits for lines in the angalactic anti-center direction at 4.4 MeV and 6.1 MeV are 6 and 4 x 10 to the minus 4 power gamma/sq cm-s.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.; p 217-222
    Format: text
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  • 4
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    Applications of Gas Imaging Micro-Well Detectors to an Advanced Compton Telescope (2003)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: We present a concept for an Advanced Compton Telescope (ACT) based on the use of pixelized gas micro-well detectors to form a three-dimensional electron track imager. A micro-well detector consists of an array of individual micro-patterned proportional counters opposite a planar drift electrode. When combined with thin film transistor array readouts, large gas volumes may be imaged with very good spatial and energy resolution at reasonable cost. The third dimension is determined by timing the drift of the ionization electrons. The primary advantage of this approach is the excellent tracking of the Compton recoil electron that is possible in a gas volume. Such good electron tracking allows us to reduce the point spread function of a single incident photon dramatically, greatly improving the imaging capability and sensitivity. The polarization sensitivity, which relies on events with large Compton scattering angles, is particularly enhanced. We describe a possible ACT implementation of this technique, in which the gas tracking volume is surrounded by a CsI calorimeter, and present our plans to build and test a small prototype over the next three years.
    Keywords: Instrumentation and Photography
    Format: application/pdf
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  • 5
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    Results of Mariner Mars tracking calibration experiment (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Ground station network S-band tracking in three-way Doppler modes of Mariner 9 in deep space provided geodetic parameters with an accuracy of 15 meters for use in Apollo 16 and Apollo 17 programs. It was concluded that unified S-band Doppler data provide geodetic results with accuracies comparable to laser ranging data.
    Keywords: SPACE VEHICLES
    Type: Significant Accomplishments in Technol., 1972; p 121-124
    Format: application/pdf
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  • 6
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    Oceanic and Atmospheric Anomalies Related to Tropical Instability Waves (2000)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Geophysics
    Type: Geophysical Research Letters
    Format: text
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  • 7
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    Meteorology experiments - The Viking Mars Lander. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The purposes, procedures, and nature of the planned meteorology experiment of Viking, 1976 are described. The elements to be measured are pressure, temperature, wind speed, wind direction, and water vapor content of the atmosphere. The interactions with other Viking experiments are outlined and candidate sensors are described.
    Keywords: SPACE SCIENCES
    Type: Icarus; 16; Feb. 197
    Format: text
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  • 8
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    Microphysical, microchemical and adhesive properties of lunar material. 3: Gas interaction with lunar material (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Knowledge of the reactivity of lunar material surfaces is important for understanding the effects of the lunar or space environment upon this material, particularly its nature, behavior and exposure history in comparison to terrestrial materials. Adsorptive properties are one of the important techniques for such studies. Gas adsorption measurements were made on an Apollo 12 ultrahigh vacuum-stored sample and Apollo 14 and 15 N2-stored samples. Surface area measurements were made on the latter two. Adsorbate gases used were N2, A, O2 and H2O. Krypton was used for the surface area determinations. Runs were made at room and liquid nitrogen temperature in volumetric and gravimetric systems. It was found that the adsorptive/desorptive behavior was in general significantly different from that of terrestrial materials of similar type and form. Specifically (1) the UHV-stored sample exhibited very high initial adsorption indicative of high surface reactivity, and (2) the N2-stored samples at room and liquid nitrogen temperatures showed that more gas was desorbed than introduced during adsorption, indicative of gas release from the samples. The high reactivity is a scribed cosmic ray track and solar wind damage.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-115707
    Format: application/pdf
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  • 9
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    Circuit performance of a parasitic-loading digital speed controller for a 400-hertz turbine-driven alternator (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Parasitic speed controllers are used in space power electrical generating systems to maintain the speed of the turbine-driven alternators within specified limits. Selected subcircuits for a solid state parasitic-loading speed controller were assembled and tested. The test results as obtained to date consist of the performance evaluation of the frequency reference and the period counter subcircuits. These circuits performed as expected.
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-TM-X-68034
    Format: application/pdf
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  • 10
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    A flight investigation with a STOL airplane flying curved, descending instrument approach paths (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A flight investigation using a De Havilland Twin Otter airplane was conducted to determine the configurations of curved, 6 deg descending approach paths which would provide minimum airspace usage within the requirements for acceptable commercial STOL airplane operations. Path configurations with turns of 90 deg, 135 deg, and 180 deg were studied; the approach airspeed was 75 knots. The length of the segment prior to turn, the turn radius, and the length of the final approach segment were varied. The relationship of the acceptable path configurations to the proposed microwave landing system azimuth coverage requirements was examined.
    Keywords: AIRCRAFT
    Type: NASA-TN-D-7669 , L-9549
    Format: application/pdf
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