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  • LUNAR AND PLANETARY EXPLORATION  (195)
  • Inorganic Chemistry
  • Superfluidity and superconductivity
  • 2015-2019
  • 1975-1979  (221)
  • 1950-1954
  • 1930-1934
  • 1925-1929
  • 1975  (221)
Collection
Publisher
Years
  • 2015-2019
  • 1975-1979  (221)
  • 1950-1954
  • 1930-1934
  • 1925-1929
Year
  • 1
    Publication Date: 2011-08-16
    Description: Pioneer 11 observations of the interaction of Jupiter's magnetosphere with the distant solar wind have confirmed the earlier Pioneer 10 observations of the great size and extreme variability of the outer magnetosphere. The nature of the plasma transitions across Jupiter's bow shock and magnetopause as observed on Pioneer 10 have also been confirmed on Pioneer 11. However, the northward direction of the Pioneer 11 outbound trajectory and the distance of the final magnetopause crossing (80 Jupiter radii) now suggest that Jupiter's magnetosphere is extremely broad with a half-thickness (normal to the ecliptic plane in the noon meridian) which is comparable to or greater than the sunward distance to the nose.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 188; May 2
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  • 2
    Publication Date: 2019-06-27
    Description: (For abstract see issue 03, p. 459, Accession no. A75-13187)
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 3
    Publication Date: 2019-06-27
    Description: This paper describes the digital processing performed on the images of Mercury returned to earth from Mariner 10. Each image contains considerably more information than can be displayed in a single picture. Several specialized processing techniques and procedures are utilized to display the particular information desired for specific scientific analyses: radiometric decalibration for photometric investigations, high-pass filtering to characterize morphology, modulation transfer function restoration to provide the highest possible resolution, scene-dependent filtering of the terminator images to provide maximum feature discriminability in the regions of low illumination, and rectification to cartographic projections to provide known geometric relationships between features. A principal task was the construction of full disk mosaics as an aid to the understanding of surface structure on a global scale.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 80; June 10
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  • 4
    Publication Date: 2019-06-27
    Description: A preliminary report is presented of energetic electrons and protons observed with the University of Iowa instrument on Pioneer 11. A graph shows absolute, spin-averaged unidirectional intensities of electrons and protons as a function of time during traversal of the central magnetosphere. Another graph shows the effects of the Jovian satellites Io and Amalthea on particle intensities. It is pointed out that a full analysis of satellite effects is the most promising technique for understanding the physical dynamics of the magnetosphere of Jupiter.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 188; May 2
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  • 5
    Publication Date: 2019-07-13
    Description: The paper reports a comparative study of solar-flare tracks and other microscopic features in unmetamorphosed lunar breccias, carbonaceous chondrites, and noncarbonaceous gas-rich meteoritic breccias. The data suggest that these objects originated from material once on and just below the surface of solar-system regoliths. Characteristics of these regoliths are discussed with reference to the track-rich olivines in Orgueil and the impregnated Apollo 16 deep drill core. The use of a variant of the fission-track method to determine the time of compaction of soil grains into a breccia is explained.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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  • 6
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 29Si-NMR Spectroscopy of Silicate Solutions. II. On the Dependence of the Structure of Silicate Anions in Water Solutions from the Na : Si RatioThe 29Si-FT-NMR spectra of 13 sodiumsilicate solutions with different Na:Si ratios are investigated with regard to the structure of the silicate anions in the solutions. The 5 typical building units (Monosilicate, end-, middle-, branching and crosslinking groups) show characteristic and non overlapping ranges of the 29Si chemical shift with many signals splittings caused by different neighbouring group effects. The relative intensities of the signals give informations on the concentrations and the equilibrium of condensation of the silicate anions in dependence of the Na:Si ratio. It is shown, that many types of anions with different degree of condensation coexist in an equilibrium, which is shiftet to the polymer silicate anions with high content of branching and crosslinking groups on the decrease of the Na:Si ratio.
    Notes: Die 29Si-FT-NMR-Spektren von 13 Natriumsilicatlösungen mit unterschiedlichem Na:Si-Verhältnis werden in Hinblick auf die Struktur der in den Lösungen auftretenden Silicatanionen untersucht. Für die 5 möglichen Baugruppen (Monosilicat, Endgruppen. Mittelgruppen, Verzweigungs- und Vernetzungsgruppen) lassen sich definierte Bereiche der 29Si-chemischen Verschiebung angeben, in denen durch Einfluß der weiteren strukturellen Umgebung i. a. zahlreiche Signalaufspaltungen beobachtet werden. Aus den relativen Intensitäten der Signale können Aussagen über die Konzentrationsverteilung und damit über das Kondensationsgleichgewicht der Silicatanionen in Abhängigkeit vom Na:Si-Verhältnis abgeleitet werden. Es zeigt sich, daß zahlreiche Anionentypen mit unterschiedlichem Kondensationsgrad nebeneinander in einem Gleichgewicht vorliegen, das sich mit fallendem Na:Si-Verhältnis stark auf die Seite höhermolekularer Silicatanionen mit hohem Gehalt an Verzweigungs- und Vernetzungsgruppen verschiebt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
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    In:  Other Sources
    Publication Date: 2011-08-16
    Description: The xenon anomalies trapped in meteorites and the moon may have first been trapped in circumstellar grains formed in or outside of postexplosive stars. In that case, the initial solar nebula need not have contained most of their radioactive progenitors, and this would necessitate major revision of the history of solar system formation.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 9
    Publication Date: 2011-08-16
    Description: A 640 element phase-steerable dipole array has been used to make highly sensitive observations of the planet Jupiter during the 1973 apparition. The satellite Io is found to have very little influence at the low flux levels, whereas the definition of sources A and B appears to be relatively flux independent. A two-dimensional analysis of the data in the Jupiter-Io plane has revealed considerable source B activity at low intensities which is not influenced by Io.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 25; May 1975
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  • 10
    Publication Date: 2011-08-16
    Description: Data from the Pioneer 10 radio occultation measurements are utilized to study the vertical electron number density distribution in the Jovian ionosphere. The immersion measurements were made at 26 North latitude in the late afternoon local time. The solar zenith angle in this region was 81 deg. Emersion measurements were made at 58 North latitude near the morning terminator where the solar zenith angle was 95 deg. The detectable portion of the Jovian ionosphere consists of a number of layers distributed over an altitude range of more than 3000 km. The maximum density appears to be on the order of 30,000 electrons per cu cm. Assuming that H(+) is the principal ion in the upper portion of the ionosphere yields a topside plasma temperature of 900 plus or minus 400 K.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy and Astrophysics; 39; 1, Fe; Feb. 197
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