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  • Life and Medical Sciences  (565)
  • Lunar and Planetary Science and Exploration  (195)
  • Ertrag
  • 1995-1999  (761)
  • 1920-1924
  • 1998  (761)
Collection
Keywords
Publisher
Years
  • 1995-1999  (761)
  • 1920-1924
Year
  • 1
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    A model of leaf area development and senescence for winter oilseed rape (1998)
    In:  Field Crops Research 57, p.209-222
    Details
    Publication Date: 1998
    Description: Beschreibung eines Untermodels zur Simulation des Blattflächenindex von Raps KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Châlons und Grignon, Frankreich und Jyndevad, Dänemark ; 1991-1995 ; Ertrag ; Vegetationsperiode ; Wachstum ; Raps ; Modell
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    BIBLIOGRAPHY INKA BB
  • 2
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    Topography of the northern hemisphere of Mars from the Mars Orbiter Laser Altimeter (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The first 18 tracks of laser altimeter data across the northern hemisphere of Mars from the Mars Global Surveyor spacecraft show that the planet at latitudes north of 50 degrees is exceptionally flat; slopes and surface roughness increase toward the equator. The polar layered terrain appears to be a thick ice-rich formation with a non-equilibrium planform indicative of ablation near the periphery. Slope relations suggest that the northern Tharsis province was uplifted in the past. A profile across Ares Vallis channel suggests that the discharge through the channel was much greater than previously estimated. The martian atmosphere shows significant 1-micrometer atmospheric opacities, particularly in low-lying areas such as Valles Marineris.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 279; 5357; 1686-92
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Atomic force microscopy imaging of fragments from the Martian meteorite ALH84001 (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A combination of scanning electron microscopy (SEM) and environmental scanning electron microscopy (ESEM) techniques, as well as atomic force microscopy (AFM) methods has been used to study fragments of the Martian meteorite ALH84001. Images of the same areas on the meteorite were obtained prior to and following gold/palladium coating by mapping the surface of the fragment using ESEM coupled with energy-dispersive X-ray analysis. Viewing of the fragments demonstrated the presence of structures, previously described as nanofossils by McKay et al. (Search for past life on Mars--possible relic biogenic activity in martian meteorite ALH84001. Science, 1996, pp. 924-930) of NASA who used SEM imaging of gold-coated meteorite samples. Careful imaging of the fragments revealed that the observed structures were not an artefact introduced by the coating procedure.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Journal of microscopy (ISSN 0022-2720); Volume 189 Pt 1; 2-7
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    NASA TECHNICAL REPORTS
  • 4
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    Orbit selection and its impact on radiation warning architecture for a human mission to Mars (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: With the recent announcement of the discovery of the possibility of life on Mars, there is renewed interest in Mars missions, perhaps eventually in human missions. Astronauts on such missions are at risk to occasional periods of enhanced high energy particle flux from the sun known as Solar Particle Events. These events can pose a substantial risk to the health of the astronauts and to the on-board electronics. Effective forecast and warning of these events could provide time to take steps to minimize the risk (retreating to a safe haven, shutting down sensitive equipment, etc.) Providing that forecast capability, will require additional monitoring capability. The extent of this architecture is sensitive to the orbit selected for the transfer to and from Mars. This paper looks at the major classes of Mars missions (Conjunction and Opposition) and sub-categories of these classes and draws conclusions on the number of monitoring satellites needed for each, with a goal to reducing total system cost through optimum orbit selection.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Acta astronautica (ISSN 0094-5765); Volume 42; 1-8; 411-7
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    NASA TECHNICAL REPORTS
  • 5
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    A search for endogenous amino acids in martian meteorite ALH84001 (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Trace amounts of glycine, serine, and alanine were detected in the carbonate component of the martian meteorite ALH84001 by high-performance liquid chromatography. The detected amino acids were not uniformly distributed in the carbonate component and ranged in concentration from 0.1 to 7 parts per million. Although the detected alanine consists primarily of the L enantiomer, low concentrations (〈0.1 parts per million) of endogenous D-alanine may be present in the ALH84001 carbonates. The amino acids present in this sample of ALH84001 appear to be terrestrial in origin and similar to those in Allan Hills ice, although the possibility cannot be ruled out that minute amounts of some amino acids such as D-alanine are preserved in the meteorite.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 279; 5349; 362-5
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    NASA TECHNICAL REPORTS
  • 6
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    A determination of the HDO/H2O ratio in comet C/1995 O1 (Hale-Bopp) (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Deuterated water (HDO) was detected in comet C/1995 O1 (Hale-Bopp) with the use of the James Clerk Maxwell Telescope on Mauna Kea, Hawaii. The inferred D/H ratio in Hale-Bopp's water is (3.3 +/- 0.8) x 10(-4). This result is consistent with in situ measurements of comet P/Halley and the value found in C/1996 B2 (Hyakutake). This D/H ratio, higher than that in terrestrial water and more than 10 times the value for protosolar H2, implies that comets cannot be the only source for the oceans on Earth.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 279; 5352; 842-4
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    NASA TECHNICAL REPORTS
  • 7
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    Results from the Mars Global Surveyor Thermal Emission Spectrometer (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Thermal Emission Spectrometer spectra of low albedo surface materials suggests that a four to one mixture of pyroxene to plagioclase, together with about a 35 percent dust component provides the best fit to the spectrum. Qualitative upper limits can be placed on the concentration of carbonates (〈10 percent), olivine (〈10 percent), clay minerals (〈20 percent), and quartz (〈5 percent) in the limited regions observed. Limb observations in the northern hemisphere reveal low-lying dust hazes and detached water-ice clouds at altitudes up to 55 kilometers. At an aerocentric longitude of 224 degrees a major dust storm developed in the Noachis Terra region. The south polar cap retreat was similar to that observed by Viking.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 279; 5357; 1692-8
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    NASA TECHNICAL REPORTS
  • 8
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    Deuterium in comet C/1995 O1 (Hale-Bopp): detection of DCN (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Deuterated hydrogen cyanide (DCN) was detected in a comet, C/1995 O1 (Hale-Bopp), with the use of the James Clerk Maxwell Telescope on Mauna Kea, Hawaii. The inferred deuterium/hydrogen (D/H) ratio in hydrogen cyanide (HCN) is (D/H)HCN = (2.3 +/- 0.4) x 10(-3). This ratio is higher than the D/H ratio found in cometary water and supports the interstellar origin of cometary ices. The observed values of D/H in water and HCN imply a kinetic temperature 〉/=30 +/- 10 K in the fragment of interstellar cloud that formed the solar system.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 279; 5357; 1707-10
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    NASA TECHNICAL REPORTS
  • 9
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    Distribution of rock, metals, and ices in Callisto (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Radio Doppler data from a single encounter (C3) of the Galileo spacecraft with Callisto, the outermost Galilean moon of Jupiter, indicated that Callisto was probably undifferentiated. Now, similar data from a second encounter (C9) corroborate this conclusion, but more accurate data from a third encounter (C10) indicate that the rock and ice within Callisto have partially, but not completely, separated. Callisto may be differentiated into a rock-metal core less than 25 percent of Callisto's radius, an outer layer of clean ice less than 350 km thick, and a middle layer of mixed rock and ice. Models in which ice and rock are mixed all the way to the center of Callisto are also consistent with the data.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 280; 5369; 1573-6
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    NASA TECHNICAL REPORTS
  • 10
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    Detection of atomic deuterium in the upper atmosphere of Mars (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: High-resolution spectroscopy of Mars' atmosphere with the Hubble Space Telescope revealed the deuterium Lyman alpha line at an intensity of 23 +/- 6 rayleighs. This measured intensity corresponds to HD/H2 = 1.5 +/- 0.6 x 10(-4), which is smaller by a factor of 11 than HDO/H2O. This indicates that fractionation of HD/H2 relative to that of HDO/H2O is not kinetically controlled by the rates of formation and destruction of H2 and HD but is thermodynamically controlled by the isotope exchange HD + H2O left and right arrow HDO + H2. Molecular hydrogen is strongly depleted in deuterium relative to water on Mars because of the very long lifetime of H2 (1200 years). The derived isotope fractionation corresponds to an estimate of a planetwide reservoir of water ice about 5 meters thick that is exchangeable with the atmosphere.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 280; 5369; 1576-80
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    NASA TECHNICAL REPORTS
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