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  • 1
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    Concentrations and isotope ratios of carbon, nitrogen and sulfur in ocean-floor basalts (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Ocean floor basalts studied from the Galapagos Ridge, FAMOUS area, Cayman Trough and Kilauea east rift contain 20-200 ppm carbon and 0.3-2.8 ppn nitrogen as sums of the vesicle-filling gases CO2 and N2 and dissolved species. The wide range of carbon contents found is due partly to the different extent of outgassing of vesicle-filling gases and partly to depth dependency of dissolved CO2 in the basalts. Sulfate commonly exists with sulfide in these basalts, and the sulfate/sulfide ratio increases with increasing water content, perhaps reflecting the higher oxidation potential in basalt melt of the higher water content.
    Keywords: GEOPHYSICS
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 48; 2433-244
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  • 2
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    Data Transmission Signal Design and Analysis (1972)
    In:  CASI
    Details
    Publication Date: 2014-09-09
    Description: The error performances of several digital signaling methods are determined as a function of a specified signal-to-noise ratio. Results are obtained for Gaussian noise and impulse noise. Performance of a receiver for differentially encoded biphase signaling is obtained by extending the results of differential phase shift keying. The analysis presented obtains a closed-form answer through the use of some simplifying assumptions. The results give an insight into the analysis problem, however, the actual error performance may show a degradation because of the assumptions made in the analysis. Bipolar signaling decision-threshold selection is investigated. The optimum threshold depends on the signal-to-noise ratio and requires the use of an adaptive receiver.
    Keywords: COMMUNICATIONS
    Type: Auburn Univ. The NASA-ASEE Summer Fac. Fellowship Program; p 399-437
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  • 3
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    Carbon and its isotopes in mid-oceanic basaltic glasses (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Sample surface carbon, mantle carbon dioxide in vesicles, and mantle carbon dissolved in glasses, are the three carbon components evident in the 11 mid-oceanic basalts presently analyzed. The total carbon content may be controlled by the depth of the shallowest ridge magma chamber, and carbon isotopic fractionation accompanies magma degassing. Using He-3 and carbon data for submarine hydrothermal fluids, the present day midoceanic ridge carbon flux is approximately estimated to be 1.0 x 10 to the 13th g C/yr, requiring 8 Gyr to accumulate the earth's present crustal carbon inventory.
    Keywords: GEOPHYSICS
    Type: Earth and Planetary Science Letters (ISSN 0012-821X); 69; 1, Ju; 43-57
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  • 4
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    Unified S-band 30-foot Antenna Side Lobe Radiation (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Unified S-band thirty-foot antenna side lobe radiation
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-55436 , X-513-65-43
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  • 5
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    Apollo entry radar acquistion study (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Apollo entry radar acquisition of command module for tracking during ionization blackout
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-55303 , X-513-65-225
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  • 6
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    F layer ionization patches in the polar cap (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ground-based optical and digital ionosonde measurements were conducted at Thule, Greenland to measure ionospheric structure and dynamics in the nighttime polar cap F layer. These observations showed the existence of large-scale (800-1000 km) plasma patches drifting in the antisunward direction during a moderately disturbed (Kp greater than or equal to 4) period. Simultaneous Dynamics Explorer (DE-B) low-altitude plasma instrument (LAPI) measurements show that these patches with peak densities of about 10 to the 6th el per cu cm are not locally produced by structured particle precipitation. The LAPI measurements show a uniform precipitation of polar rain electrons over the polar cap. The combined measurements provide a comprehensive description of patch structure and dynamics. They are produced near or equatorward of the dayside auroral zone and convect across the polar cap in the antisunward direction. Gradients within the large scale, drifting patches are subject to structuring by convective instabilities. UHF scintillation and spaced receiver measurements are used to map the resulting irregularity distribution within the patches.
    Keywords: GEOPHYSICS
    Type: AD-A140133 , AFGL-TR-84-0113 , Journal of Geophysical Research (ISSN 0148-0227); 89; 1683-169
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  • 7
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    Polarimetry of the daytime sky during solar eclipses. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurement of the degree of linear polarization of the residual illumination in the umbral region in different colors at intermediate levels in the atmosphere (10 to 12 km) during the total solar eclipses of May 30, 1965, and Nov. 12, 1966. The objective was to examine the polarization characteristics of light that had been scattered more than once. It is found that, in the middle of the visible region of the electromagnetic spectrum (0.4 to 0.6 micron), multiply scattered light is partially linearly polarized (about 20%) at the altitudes where the measurements have been made. Results of similar ground-based measurements performed during the annular eclipse of Sept. 11, 1969, are also briefly discussed.
    Keywords: GEOPHYSICS
    Type: AD-752766 , AFCRL-72-0702 , Journal of Atmospheric and Terrestrial Physics; 34; Apr. 197
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  • 8
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    Characterization of impulse noise and analysis of its effect upon correlation receivers (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A noise model is formulated to describe the impulse noise in many digital systems. A simplified model, which assumes that each noise burst contains a randomly weighted version of the same basic waveform, is used to derive the performance equations for a correlation receiver. The expected number of bit errors per noise burst is expressed as a function of the average signal energy, signal-set correlation coefficient, bit time, noise-weighting-factor variance and probability density function, and a time range function which depends on the crosscorrelation of the signal-set basis functions and the noise waveform. A procedure is established for extending the results for the simplified noise model to the general model. Unlike the performance results for Gaussian noise, it is shown that for impulse noise the error performance is affected by the choice of signal-set basis functions and that Orthogonal signaling is not equivalent to On-Off signaling with the same average energy.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-123611 , TR-135-102
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  • 9
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    Rocket measurement of the secondary electron spectrum in an aurora (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Differential secondary electron flux measurement in aurora with Aerobee rocket spectrometer
    Keywords: GEOPHYSICS
    Type: ; BROTECHNIKA, NO. 1(
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  • 10
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    Rocket measurement of the secondary electron spectrum in an aurora (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Secondary electron emission measurement in aurora using Aerobee rocket vehicle
    Keywords: GEOPHYSICS
    Type: NASA-CR-116858 , TR-26
    Format: application/pdf
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