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  • SPACE SCIENCES  (16)
  • Lunar and Planetary Science and Exploration  (8)
  • 1
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    Lunar fines and terrestrial rock powders - Relative surface areas and heats of adsorption (1971)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Apollo 11 lunar fines and ground terrestrial mafic rock powders effective surface areas and heats of adsorption, using Brunauer-Emmett-Teller Kr adsorption method
    Schlagwort(e): SPACE SCIENCES
    Materialart: ; TROPHYSICAL JOURNAL
    Format: text
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  • 2
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    Adsorption on the Martian regolith (1971)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Mars regolith carbon dioxide, water and Kr adsorption, explaining diurnal brightness phenomena
    Schlagwort(e): SPACE SCIENCES
    Materialart: ; UG-REVUE(
    Format: text
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  • 3
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    Origin of planetary primordial rare gas - The possible role of adsorption. (1972)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: The degree of physical adsorption of Ne, Ar, Kr, and Xe on pulverized samples of the Allende meteorite at 113 K has been measured. The observed pattern of equilibrium enrichment of heavy rare gases over light on the pulverized meteorite surfaces relative to the gas phase is similar to the enrichment pattern exhibited by planetary primordial rare gas when compared with the composition of solar rare gas. Results indicate that, at 113 K, a total nebular pressure of from .01 to .001 atm would be required to explain the Ar, Kr, and Xe abundances in carbonaceous chondrites with an adsorption mechanism. This pressure estimate is compatible with the range of possible nebular pressures suggested by astrophysical arguments. However, the subsequent mechanism by which initially adsorbed gas might have been transferred into the interiors of grains cannot be identified at present.
    Schlagwort(e): SPACE SCIENCES
    Materialart: Geochimica et Cosmochimica Acta; 36; Mar. 197
    Format: text
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  • 4
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    Field Simulation of a Drilling Mission to Mars to Search for Subsurface Life (2005)
    In:  CASI
    Details
    Publikationsdatum: 2017-10-02
    Beschreibung: The discovery of near surface ground ice by the Mars Odyssey mission and the abundant evidence for recent Gulley features observed by the Mars Global Surveyor mission support longstanding theoretical arguments for subsurface liquid water on Mars. Thus, implementing the Mars program goal to search for life points to drilling on Mars to reach liquid water, collecting samples and analyzing them with instrumentation to detect in situ organisms and biomarker compounds. Searching for life in the subsurface of Mars will require drilling, sample extraction and handling, and new technologies to find and identify biomarker compounds and search for living organisms. In spite of its obvious advantages, robotic drilling for Mars exploration is in its technological infancy and has yet to be demonstrated in even a terrestrial field environment.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Lunar and Planetary Science XXXVI, Part 18; LPI-Contrib-1234-Pt-18
    Format: application/pdf
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  • 5
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    Basic studies in space vehicle attitude control Ninth semiannual status report (1965)
    In:  CASI
    Details
    Publikationsdatum: 2019-05-29
    Beschreibung: Space vehicle attitude control systems - manned space station, satellite in elliptic orbit, and solar perturbation of Mars Orbiter
    Schlagwort(e): SPACE SCIENCES
    Materialart: NASA-CR-69657
    Format: application/pdf
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  • 6
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    Mars Analog Rio Tinto Experiment (MARTE): 2003 Drilling Campaign to Search for a Subsurface Biosphere at Rio Tinto Spain (2004)
    In:  CASI
    Details
    Publikationsdatum: 2018-06-11
    Beschreibung: The MARTE (Mars Astrobiology Research and Technology Experiment) project, an ASTEP field experiment, is exploring for a hypothesized subsurface anaerobic chemoautotrophic biosphere in the region of the Tinto River- or Rio Tinto- in southwestern Spain. It is also demonstrating technology needed to search for a subsurface biosphere on Mars. The project has three primary objectives: (1) search for and characterize subsurface life at Rio Tinto along with the physical and chemical properties and sustaining energy sources of its environment, (2) perform a high fidelity simulation of a robotic Mars drilling mission to search for life, and (3) demonstrate the drilling, sample handling, and instrument technologies relevant to searching for life on Mars. The simulation of the robotic drilling mission is guided by the results of the aseptic drilling campaign to search for life at Rio Tinto. This paper describes results of the first phase of the aseptic drilling campaign.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Lunar and Planetary Science XXXV: Astrobiology: Analogs and Applications to the Search for Life; LPI-Contrib-1197
    Format: text
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  • 7
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    The small-scale structure of radio galaxies and quasi-stellar sources at 3.8 centimeters. (1971)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Observation of fringes from 31 compact radio sources, including eight known or suspected galaxies and 20 known or suspected QSSs, by using the Goldstack interferometer at lambda = 3.8 cm (d/lambda = 10 to the 8th power). Fringe visibility curves were obtained for nine sources showing structure on a scale of .001 sec of arc, and simple models are fitted to the data. Results for 3C 273 and 3C 279 are compared with data taken by Knight et al. (1971) at an earlier epoch. The apparent changes in brightness distribution of 3C 273 and 3C 279 are difficult to explain.
    Schlagwort(e): SPACE SCIENCES
    Materialart: Astrophysical Journal; 170; Dec. 1
    Format: text
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  • 8
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    Fixation of virgin lunar surface soil (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Two systems are shown to be suitable for fixing loose particulate soils with a polymer film, without visually detectable disturbance of the soil particle spatial relationships. A two-component system is described, which uses a gas monomer condensible at the soil temperature and a gas phase catalyst acting to polymerize the monomer. A one-component system using a monomer which polymerizes spontaneously on and within the top few millimeters of the soil is also considered. The two-component system employs a simpler apparatus, but it operates over a narrower temperature range (approximately -40 to -10 C). Other two-component systems were identified which may operate at soil temperatures as high as +100 C, at relatively narrow temperature ranges of approximately 30 C. The one-component system was demonstrated to operate successfully with initial soil temperatures from -70 C or lower to +150 C.
    Schlagwort(e): SPACE SCIENCES
    Materialart: NASA-CR-125680 , JPL-TM-33-521
    Format: application/pdf
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  • 9
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    The structure of a sunspot. III. (1968)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: Sunspot structure model explaining features of Wilson effect, using intensity profiles from microphotometer tracings across photographs during passage across disk
    Schlagwort(e): SPACE SCIENCES
    Materialart: ; URNAL OF PHYSICS, PA
    Format: text
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  • 10
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    Exchange of adsorbed H2O and CO2 between the regolith and atmosphere of Mars caused by changes in surface insolation (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Estimates have been made of the capacity of the Martian regolith to exchange adsorbed H2O and CO2 with the atmosphere-plus-cap system (APCS). These estimates are based upon measured isotherms for H2O and CO2 adsorption on pulverized basalt at low temperatures and on theoretical considerations. A unit column (1 sq cm) of regolith with a deep subsurface temperature of -77 C, considered average for the disk, will contain about 0.4 g of adsorbed CO2 and about 1 g of adsorbed H2O per meter of depth. Under favorable circumstances the top 3 cm can exchange much more H2O with the lower atmosphere each day than is necessary to produce the diurnal brightening. The process appears to be seasonally reversible. The total regolith may contain, in the adsorbed phase alone, as much as 1% of the H2O and 5% of the CO2 surface inventories expected for a hypothetical Mars that has experienced degassing as intensive as that of earth.
    Schlagwort(e): SPACE SCIENCES
    Materialart: Journal of Geophysical Research; 79; Aug. 20
    Format: text
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