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  • Zeitschriften
  • Weitere Quellen  (1.018)
  • ASTRONAUTICS (GENERAL)  (1.012)
  • Meteorology and Climatology
  • 1985-1989  (1.018)
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  • 1
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    Seafloor hydrothermal activity and spreading rates: the Eocene carbon dioxide greenhouse revisted (1985)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: A suggestion has been made that enhanced rates of hydrothermal activity during the Eocene could have caused a global warming by adding calcium to the ocean and pumping CO2 into the atmosphere (Owen and Rea, 1984). This phenomenon was purported to be consistent with the predictions of the CO2 geochemical cycle model of Berner, Lasaga and Garrels (1983) (henceforth BLAG). In fact, however, the BLAG model predicts only a weak connection between hydrothermal activity and atmospheric CO2 levels. By contrast, it predicts a strong correlation between seafloor spreading rates and pCO2, since the release rate of CO2 from carbonate metamorphism is assumed to be proportional to the mean spreading rate. The Ecocene warming can be conveniently explained if the BLAG model is extended by assuming that the rate of carbonate metamorphism is also proportional to the total length of the midocean ridges from which the spreading originates.
    Schlagwort(e): Meteorology and Climatology
    Materialart: Geochimica et cosmochimica acta (ISSN 0016-7037); Volume 49; 2541-4
    Format: text
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  • 2
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    Wisconsin's study of manned Mars missions (1987)
    In:  CASI
    Details
    Publikationsdatum: 2004-12-04
    Beschreibung: The design group focused on three topics: (1) Extravehicular Activities, (2) Sample Return Missions, and (3) Structural and Construction Considerations of a Manned Mars Habitat. Extravehicular Activities permit a Mars based astronaut to exit the habitat and perform mission activities in the harsh Mars environment. Today's spacesuit gloves are bulky, hard to manipulate and fatiguing. A mechanical assistance mechanism has been developed for the glove that will reduce user fatigue and increase the duration of EVA's. Oxygen supply systems are also being developed for the EVA astronaut. A scuba type system of tanked breathing air proves to be the most efficient system for short duration EVA's. A system that extracts the oxygen from atmospheric carbon dioxide can provide oxygen for long duration FVA's. Sample Return Missions require that samples be taken from several sites. Transportation considerations are addressed and two transportation schemes are proposed. The first scheme involves a lighter than air balloon. This system provides excellent range. The second design is a rover that uses tracks rather than wheels. Track rovers perform well in soft, sandy conditions. Engineering aspects of a habitat and domed greenhouse were investigated and plans for the habitat have been made. A configuration has been established and construction details have been made.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: USRA, Agenda of the Third Annual Summer Conference, NASA(USRA University Advanced Design Program; p 39
    Format: text
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  • 3
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    The development of a cislunar space infrastructure (1988)
    In:  CASI
    Details
    Publikationsdatum: 2005-07-19
    Beschreibung: The primary objective of the University of Colorado Advanced Mission Design Program is to define the characteristics and evolution of a near-Earth space infrastructure. The envisioned foundation includes a permanently manned, self-sustaining base on the lunar surface, an L1 space station, and a transportation system that anchors these elements to a low Earth orbit (LEO) station. The motivation of this project was based on the idea that a near-Earth space infrastructure is not an end but an important step in a larger plan to expand man's capabilities in space science and technology. The presence of a cislunar space infrastructure would greatly facilitate the staging of future planetary missions, as well as facilitating the full exploration of the potential for science and industry on the lunar surface. This paper will provide a sound rationale and a detailed scenario in support of the cislunar infrastructure design.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: USRA, NASA(USRA University Advanced Design Program Fourth Annual Summer Conference; p 75-83
    Format: text
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  • 4
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    Lessons learnt from 11 GAS payloads flown on 5 shuttle missions (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-12
    Beschreibung: Selected hints derived from 5 years experience in experiment hardware design, hardware qualification, safety provisions, experiment testing, payload integration, flight preparation, battery transport, and postmission checkout are presented.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 255-265
    Format: text
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  • 5
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    Response of GAS payload (G345 and G347) temperatures to various orbiter flight attitudes (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-12
    Beschreibung: At the beginning of the Get-Away Special (GAS) flight program, the GAS Project flew a Flight Verification Payload on STS-3 to make measurements of the vibrations, acoustic and magnetic environments of the canister, and to obtain thermal profiles of internal and external components of the GAS system. Two types of GAS canister end caps (insulated end cap and silverized teflon covered end cap) were used on the two flights (STS-7 and STS-8) so that a direct comparison of the thermal performance was obtained. These observations were compared with a simple thermal model of the instrument in the GAS canister in order to assess whether such simple models can be useful to experimenters in predicting the thermal response of their payloads.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: The 1985 Get Away Special Experimenter's Symposium; p 151-164
    Format: text
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  • 6
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    Material sciences experiments under microgravity conditions with MAUS (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-12
    Beschreibung: Project MAUS is a part of the German material sciences program and provides autonomous payloads for the Space Shuttle. These payloads are housed in canisters which are identical with those of NASA's Get Away Special program. The main components of the hardware are: a standard system consisting of power supply, experiment control, data acquisition and the experiment modules containing experiment specific hardware. So far, three MAUS modules with experiments from the area of material sciences have been flown as GAS payloads. They deal with the effects of reduced sedimentation, convection phenomena caused by temperature gradients and the behavior of dispersed particles ahead of a solid/liquid interface.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 101-108
    Format: text
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  • 7
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    G-38, G-39 and G-40: Art in space, a divergent exploration (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-12
    Beschreibung: The results of the Get Away Special (GAS) Arts-Science payload G-38, processed in orbit on board the Space Shuttle Challenger during mission 41-G STS 17, October 5 to 13, l984 are explained. The payload G-38 was created as a unified Arts-Science payload that simultaneously explored the process of vapor deposition in the vacuum and weightlessness of the shuttle environment and created a series of space sculptures utilizing this process. The purpose of the experiment was to test the sputter deposition process in space and to create five subtle spherical sculptures with metallic coatings of gold, silver, platinum and chrome.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 267-273
    Format: text
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  • 8
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    Growth of zeolite crystals in the microgravity environment of space (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-12
    Beschreibung: Zeolites are hydrated, crystalline aluminosilicates with alkali and alkaling earth metals substituted into cation vacancies. Typically zeolite crystals are 3 to 8 microns. Larger cyrstals are desirable. Large zeolite crystals were produced (100 to 200 microns); however, they have taken restrictively long times to grow. It was proposed if the rate of nucleation or in some other way the number of nuclei can be lowered, fewer, larger crystals will be formed. The microgravity environment of space may provide an ideal condition to achieve rapid growth of large zeolite crystals. The objective of the project is to establish if large zeolite crystals can be formed rapidly in space.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 133-140
    Format: text
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  • 9
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    United States Air Force Academy's micro-gravity research using G-0307 (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-12
    Beschreibung: The current materials research being done in microgravity solidification and the future experimentation planned onboard a space shuttle mission is reported. The Department of Engineering Mechanics at the USAF Academy is developing a microgravity furnace to be used on board the space shuttle. The microgravity furnace will be used to conduct materials research dealing with such topics as immiscible alloy solidification. The purpose behind this research project is three-fold: to develop a simple, inexpensive, and easy to use furnace to conduct space materials research, to conduct a solidification experiment on a lead-zinc alloy in space that macrosegregates due to gravity, and to provide a research mechanism for students to get involved with space materials research.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 85-86
    Format: text
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  • 10
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    Design and development of a window assembly for a GAS payload (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-12
    Beschreibung: A sealed window assembly for the Get Away Special (GAS) payloads was developed from a synthetic fused silica. The details of the design and development of this window assembley are given.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 275-284
    Format: text
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