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  • Other Sources  (10)
  • 2010-2014
  • 1970-1974  (10)
  • 1950-1954
  • 1973  (10)
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  • 2010-2014
  • 1970-1974  (10)
  • 1950-1954
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  • 1
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    A short-lived chromospheric flare-point with a lifetime of 20 seconds and rise and fall times of 5 seconds (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: We have observed a chromospheric brightening in the H alpha and Ca II K lines with a diameter of about 1 arc second. The time structure of this event, obtained with a relative resolution of 1 second, shows the rise time to be 4 seconds, the lifetime (FWHM) to be 20 seconds, and the decay time to be 5 seconds. This imposes new constraints on flare-point models. These restrictions can be accommodated easily by either an infall-impact flare model or a model invoking the precipitation of high-energy particles from the corona.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 185; Nov. 1
    Format: text
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  • 2
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    Role of mineralocorticoids in the natriuresis of water immersion in man. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In an attempt to assess the quantitative contribution of aldosterone suppression to the natriuresis of water immersion, renal sodium handling in normal male subjects undergoing water immersion was examined before and after administration of exogenous mineralocorticoid. The study demonstrated that the administration of a potent mineralocorticoid in pharmacological doses failed to abolish the natriuresis of water immersion.
    Keywords: BIOSCIENCES
    Type: Circulation Research; 32; Feb. 197
    Format: text
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  • 3
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    Synchrotron sources. II - Pulsars and compact extragalactic objects. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Discussion of some limitations on synchrotron models for optical pulsars and compact extragalactic objects. Using the results of a previous paper, it is shown that several existing models for the pulsar NP 0532 are inconsistent with the measured time variations and polarization of the optical emission. The possibility that the low-frequency falloffs in some extragalactic objects (PKS 2134 + 004, OQ 208, and NGC 1068) could be due to emission from particles with small pitch angles, absorption by a thermal plasma, or synchrotron self-absorption is also considered. It is found that radiation by particles with small pitch angles could explain the radio emission from PKS 2134 + 004 and OQ 208, but this process is inconsistent with the observations of NGC 1068. The absorption interpretations cannot account for the turnover in the spectrum of PKS 2134 + 004.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 183; July 15
    Format: text
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  • 4
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    Synchrotron sources. I - Extension of theory for small pitch angles. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Some of the features of synchrotron radiation are examined which occur when relativistic particles move at small pitch angles in a magnetic field. The emission from individual particles is computed. The general properties of the emission from distributions of particles with small pitch angles is discussed, and the emissivities and degrees of polarization for several specific source models are presented. For sources which mainly contain particles with small pitch angles, the degree of circular polarization will normally be high, whereas, if the magnetic field is somewhat irregular, the degree of linear polarization will be small. If the particle distribution also has a low-energy cutoff, the emissivity will vary linearly with frequency at low frequencies.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 183; July 15
    Format: text
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  • 5
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    Gauge invariance, current conservation, and GIAO's. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The well-known relationship between gauge invariance and current conservation is exhibited within the usual quantum mechanical formalism. It is then shown that the use of Gauge Invariant Atomic Orbitals does not necessarily lead to the expected current conservation. The reason is found to lie in the constrained nature of the gauge invariance which is provided by the use of GIAO's. It is concluded that this invariance is, of itself, no argument in favor of their use.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 58; Feb. 15
    Format: text
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  • 6
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    Some aspects of cosmic synchrotron sources (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Synchrotron emission is considered from individual particles which have small pitch angles and the general properties of synchrotron sources which mainly contain such particles, as well as the emissivities and degrees of circular polarization for specific source distributions. The limitation of synchrotron source models for optical pulsars and compact extragalactic objects are discussed, and it is shown that several existing models for the pulsar NP 0532 are inconsistent with the measured time variations and polarizations of the optical emission. Discussion is made also of whether the low frequency falloffs in the extragalactic objects PKS 2134 + 004, OQ 208, and NGC 1068 is due to emission from particles with small pitch angles or absorption by a thermal plasma or synchrotron self-absorption. It is concluded that the absorption interpretations cannot account for the turnover in the spectrum of PKS 2134 + 004. Measurements of polarization, angular structure, and X-ray flux are also described.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-131526 , SUIPR-435
    Format: application/pdf
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  • 7
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    Drying apparatus for photographic sheet material (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An elongated drying chamber is provided with transport means for carrying photographic sheet material edgewise with the sheets in end-to-end relationship past a plurality of tubes that issue drying air streams. The tubes are slotted a distance equal to substantially the full width of the sheet material for complete, gentle drying by sheets of air. A common plenum supplies the tubes with heated air; the air is directed from the tube slots at a pronounced angle to the sheet surface to provide for arraying the tubes close to the surface for maximum drying effect while minimizing the danger of mechanical interference between the edges of the sheets and the slots in the tubes. The driver for the transport is housed in an enclosure between the plenum and the drying chamber; an air return duct is provided along another side to complete insulation of the drying chamber from ambient conditions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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  • 8
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    Oxygen and silicon isotope ratios of the Luna 20 soil. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Format: text
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  • 9
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    O-18/O-16 and Si-30/Si-28 studies of some Apollo 15, 16, and 17 samples (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study of lunar rock samples from eight sites on the near side of the moon showed oxygen isotope abundance variations much smaller than those in meteorites and earth material. The grain-surface coatings of the lunar fines were found to be generally depleted in oxygen relative to silicon. The lunar soils, on the other hand, were somewhat richer in both O18 and Si30 than the lunar crystalline rock.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
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  • 10
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    The isotopic composition and concentration of water, hydrogen, and carbon in some Apollo 15 and 16 soils and in the Apollo 17 orange soil (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
    Format: text
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