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  • 1990-1994  (9)
  • 1991  (9)
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  • 1990-1994  (9)
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  • 1
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    Geochemistry and petrography of the MacAlpine Hills lunar meteorites (1991)
    Elsevier
    Details
    Publikationsdatum: 1991-11-01
    Print ISSN: 0016-7037
    Digitale ISSN: 1872-9533
    Thema: Chemie und Pharmazie , Geologie und Paläontologie
    Publiziert von Elsevier
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 2
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    In-Situ Resource Utilization (ISRU): Surface systems program area of the exploration technology program (1991)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-03
    Beschreibung: The topics presented are covered in viewgraph form and include the following: (1) utilization of Lunar and Mars resources; (2) oxygen - an example of cost savings; (3) In Space Resource Utilization (ISRU); (4) basic resource processing methods; (5) planetary mining; (6) raw materials preparation; (7) validation, testbeds, and flight experiments; (8) mission readiness schedule; and (9) ISRU budget guideline.
    Schlagwort(e): ADMINISTRATION AND MANAGEMENT
    Materialart: NASA, Washington, SSTAC(ARTS Review of the Draft Integrated Technology Plan (ITP). Volume 4: Materials and Structures 21 p (SEE N93-71834 13-81); NASA, Washington, SS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    On using a pyroclastic deposit as a manned lunar base site (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: Hawke et al. (1990) suggest that ilmenite found in Apollo 17-type pyroclastic glass may provide feedstock for the hydrogen reduction of ilmenite process for producing lunar oxygen. They also suggest that the ilmenite may help retain solar wind hydrogen and helium which can be extracted for use at a lunar outpost or even transported back to Earth for fusion fuel in the case of helium-3. Therefore, they suggest that ilmenite-rich material may be the best candidate. Here, researchers propose a somewhat different approach. They propose that the pyroclastic glass can be reduced directly to produce oxygen and one or more metals. Sulfur would be another important byproduct of the processing. This process would eliminate the need for having specific minerals such as ilmenite or for doing any mineral concentration. The bulk pyroclastic would provide the feedstock. Some recent experiments at the Johnson Space Center suggest that an iron-rich composition would be the most suitable for this direct feedstock reduction and that the titanium content may not be important. Also, the lunar pyroclastic deposits would be extremely useful in constructing and supporting a lunar base.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990; p 183
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    Transmission electron microscopy of an interplanetary dust particle with links to CI chondrites (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: The majority of hydrated interplanetary dust particles (IDPs) have compositions that resemble CI and CM chondrites, however, their mineralogies are most similar to the fine grained material in certain altered type-3 carbonaceous and ordinary chondrites. During the transmission electron microscope studies of hydrated IDPs, a unique particle was discovered whose mineralogy is very similar to that reported from CI chondrites. W7013F5 is the first IDP whose mineralogy and chemistry approximates that of CI chondrites. The similarity in mineralogy and mineral chemistry suggests that W7013F5 was altered under conditions similar to those that existed on the CI parent bodies.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Lunar and Planetary Inst., Abstracts for the 54th Annual Meeting of the Meteoritical Society; p 115
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 5
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    The origin of amorphous rims on lunar plagioclase grains: Solar wind damage or vapor condensates (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: A distinctive feature of micron sized plagioclase grains from mature lunar soils is a thin (20 to 100 nm) amorphous rim surrounding the grains. These rims were originally described from high voltage electron microscope observations of lunar plagioclase grains by Dran et al., who observed rims up to 100 nm thick on plagioclase grains from Apollo 11 and 12 soils. These rims are believed to be the product of solar wind damage. The amorphous rims were studied on micron sized plagioclase grains from a mature Apollo 16 soil using a JEOL 200FX transmission electron microscope equipped with an energy dispersive x ray spectrometer. It was found that the amorphous rims are compositionally distinct from the interior plagioclase and it is proposed that a major component of vapor condensates is present in the rims.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Lunar and Planetary Inst., Abstracts for the 54th Annual Meeting of the Meteoritical Society; p 114
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Experimental reduction of simulated lunar glass by carbon and hydrogen and implications for lunar base oxygen production (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: The most abundant element in lunar rocks and soils is oxygen which makes up approximately 45 percent by weight of the typical lunar samples returned during the Apollo missions. This oxygen is not present as a gas but is tightly bound to other elements in mineral or glass. When people return to the Moon to explore and live, the extraction of this oxygen at a lunar outpost may be a major goal during the early years of operation. Among the most studied processes for oxygen extraction is the reduction of ilmenite by hydrogen gas to form metallic iron, titanium oxide, and oxygen. A related process is proposed which overcomes some of the disadvantages of ilmenite reduction. It is proposed that oxygen can be extracted by direct reduction of native lunar pyroclactic glass using either carbon, carbon monoxide, or hydrogen. In order to evaluate the feasibility of this proposed process a series of experiments on synthetic lunar glass are presented. The results and a discussion of the experiments are presented.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Lunar and Planetary Inst., 22nd Lunar and Planetary Science Conference; p 49-52
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    The violent side of mare volcanism (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-01-25
    Beschreibung: In the past 15 years it has become increasingly evident that lunar pyroclastic volcanism played an important role in the formation and resurfacing of portions of the Moon. Located on mare/highland boundaries, many of these deposits formed in association with mare volcanism. Based on recently acquired geologic and remote sensing data, two generally distinct types of pyroclastic mantling deposits have been identified: regional and localized. Both the regional dark mantling deposits (RDMD) and localized dark mantling deposits (LDMD) are widely distributed across the lunar nearside. The larger RDMD are typically located in lunar highland areas adjacent to many of the major lunar maria, while the smaller LDMD are found on the floors of pre-Imbrian and Inbrian craters. Both deposits are basaltic in composition and are presumed to have originated at great depth (approx. 300 km). The composition, geometry, and vent morphology of the pyroclastic deposits have been used to infer the eruption mechanisms and emplacement styles for both types of deposits.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Lunar and Planetary Inst., Workshop on Mare Volcanism and Basalt Petrogenesis: Astounding Fundamental Concepts (AFC) Developed Over the Last Fifteen Years; p 9-10
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
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    Using space resources (1991)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The topics covered include the following: reducing the cost of space exploration; the high cost of shipping; lunar raw materials; some useful space products; energy from the moon; ceramic, glass, and concrete construction materials; mars atmosphere resources; relationship to the Space Exploration Initiative (SEI); an evolutionary approach to using space resources; technology development; and oxygen and metal coproduction.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-TM-107966 , NAS 1.15:107966
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 9
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    Geochemistry and petrography of the MacAlpine Hills lunar meteorites (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: MacAlpine Hills 88104 and 88105, anorthositic lunar meteorites recovered form the same area in Antartica, are characterized. Petrographic studies show that MAC88104/5 is a polymict breccia dominated by impact melt clasts. It is better classified as a fragmental breccia than a regolith breccia. The bulk composition is ferroan and highly aluminous (Al2O3-28 percent).
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 55; 3089-310
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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