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  • Weitere Quellen  (8)
  • Life Sciences (General)  (4)
  • PROPELLANTS AND FUELS  (3)
  • Ground Support Systems and Facilities (Space)  (1)
  • 1
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    A compilation of lunar and Mars exploration strategies utilizing indigenous propellants (1992)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The use of propellants manufactured from indigenous space materials has the potential to significantly reduce the amount of mass required to be launched from the Earth's surface. The extent of the leverage, however, along with the cost for developing the infrastructure necessary to support such a process, is unclear. Many mission analyses have been performed that have attempted to quantify the potential benefits of in situ propellant utilization. Because the planning of future space missions includes many unknowns, the presentation of any single study on the use of in situ propellants is often met with critics' claims of the inaccuracy of assumptions or omission of infrastructure requirements. The results of many such mission analyses are presented in one format. Each summarized mission analysis used different assumptions and baseline mission scenarios. The conclusion from the studies is that the use of in situ produced propellants will provide significant reductions in Earth launch requirements. This result is consistent among all of the analyses regardless of the assumptions used to obtain the quantitative results. The determination of the best propellant combination and the amount of savings will become clearer and more apparent as the technology work progresses.
    Schlagwort(e): PROPELLANTS AND FUELS
    Materialart: NASA-TM-105262 , E-6790 , NAS 1.15:105262
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Technical prospects for utilizing extraterrestrial propellants for space exploration (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: NASA's LeRC has supported several efforts to understand how lunar and Martian produced propellants can be used to their best advantage for space exploration propulsion. A discussion of these efforts and their results is presented. A Manned Mars Mission Analysis Study identified that a more thorough technology base for propellant production is required before the net economic benefits of in situ propellants can be determined. Evaluation of the materials available on the moon indicated metal/oxygen combinations are the most promising lunar propellants. A hazard analysis determined that several lunar metal/LOX monopropellants could be safely worked with in small quantities, and a characterization study was initiated to determine the physical and chemical properties of potential lunar monopropellant formulations. A bipropellant metal/oxygen subscale test engine which utilizes pneumatic injection of powdered metal is being pursued as an alternative to the monopropellant systems. The technology for utilizing carbon monoxide/oxygen, a potential Martian propellant, was studied in subscale ignition and rocket performance experiments.
    Schlagwort(e): PROPELLANTS AND FUELS
    Materialart: IAF PAPER 91-669
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 3
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    Fatal Saccharomyces Cerevisiae Aortic Graft Infection (2002)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Saccharomyces cerevisiae is a yeast commonly used in baking and a frequent colonizer of human mucosal surfaces. It is considered relatively nonpathogenic in immunocompetent adults. We present a case of S. cerevisiae fungemia and aortic graft infection in an immunocompetent adult. This is the first reported case of S. cerevisiue fungemia where the identity of the pathogen was confirmed by rRNA sequencing.
    Schlagwort(e): Life Sciences (General)
    Materialart: Journal of Clinical Microbiology (ISSN 0095-1137); 40; 7; 2691-2692
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    A Heated Tube Facility for Rocket Coolant Channel Research (1995)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The capabilities of a heated tube facility used for testing rocket engine coolant channels at the NASA Lewis Research Center are presented. The facility uses high current, low voltage power supplies to resistively heat a test section to outer wall temperatures as high as 730 C (1350 F). Liquid or gaseous nitrogen, gaseous helium, or combustible liquids can be used as the test section coolant. The test section is enclosed in a vacuum chamber to minimize heat loss to the surrounding system. Test section geometry, size, and material; coolant properties; and heating levels can be varied to generate heat transfer and coolant performance data bases.
    Schlagwort(e): Ground Support Systems and Facilities (Space)
    Materialart: NASA-TM-106968 , E-9725 , NAS 1.15:106968 , AIAA Paper 95-2936 , 31st Joint Propulsion Conference and Exhibit; Jul 10, 1995 - Jul 12, 1995; San Diego, CA; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 5
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    The Grand Assault (2003)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-10
    Beschreibung: Plasmodium falciparum, the protozoan parasite responsible for most human malaria, is among the most studied pathogens of all time, probably only exceeded by the human immunodeficiency virus HTV and the bacterium Mycobacterium tuberculosis. The extent of human suffering and the devastating costs of malaria have long been recognized by world bodies, and numerous initiatives have been taken over the years in an effort to defeat this insidious microbe. Beginning in 1996, an international consortium of scientists from more than a dozen institutions set about to determine the sequence of the organism's 23-megabase genome. Their massive effort-which ended up going well beyond simple sequencing is reported in this special issue of Nature. The avowed goal of the project was to search for chinks in the parasite's armor so that new and effective drugs and vaccines might be developed.
    Schlagwort(e): Life Sciences (General)
    Materialart: Nature News and Views: Special Malaria Issue
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Process and apparatus for analyzing specimens for the presence of microorganisms therein (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-15
    Beschreibung: Microorganisms in a specimen are detected, identified, and enumerated by introducing the specimen into a sampling cartridge and diluting the specimen with a known volume of water within the cartridge. The cartridge has a manifold and several cassettes attached to the manifold. Each cassette contains a serpentine flow channel having a series of filters therein and a detection cell located downstream from each filter. The flow channel in each cassette also contains a culture medium which is freeze dried and is highly selective in the sense that it promotes the growth of one type of microorganism, but not others. The mixture of the specimen and water flows from the manifold into the flow channel of each cassette where it rehydrates the culture medium therein and further flows through the filters. Each filter removes a known proportion of the microorganisms from the mixture of specimen, water and medium, thereby effecting a serial dilution. After the cassettes are heated to incubate the microoganisms, the detection cells are observed for growth of the microorganisms therein which is manifested in a change in the light transmitting characteristics of the mixtures within the cells.
    Schlagwort(e): Life Sciences (General)
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 7
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    Emergence of RNA and Early Life; Experimental Modeling and Geochemical Constraints (2002)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Support from this grant continues to fund our research on two related problems. One involves attempts to model the abiotic formation of simple source compounds for functional biomolecules, their concentration from dilute state in the hydrosphere and in several cases surface induced reactions to form precursor monomers for bioactive end products. The second area is a search for the earliest traces of life on Earth and the early environments on Earth and Mars. For this purpose we have analyzed the isotopic compositions of carbon and nitrogen in graphitic residues that have been thought to represent the remains of microorganisms. The results of these studies have been presented in a number of publication, listed as references.
    Schlagwort(e): Life Sciences (General)
    Materialart: Rept-99-1436R1
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 8
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    Technical prospects for utilizing extraterrestrial propellants for space exploration (1991)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: NASA's LeRC has supported several efforts to understand how lunar and Martian produced propellants can be used to their best advantage for space exploration propulsion. A discussion of these efforts and their results is presented. A Manned Mars Mission Analysis Study identified that a more thorough technology base for propellant production is required before the the net economic benefits of in situ propellants can be determined. Evaluation of the materials available on the moon indicated metal/oxygen combinations are the most promising lunar propellants. A hazard analysis determined that several lunar metal/LOX monopropellants could be safely worked with in small quantities, and a characterization study was initiated to determine the physical and chemical properties of potential lunar monopropellant formulations. A bipropellant metal/oxygen subscale test engine which utilizes pneumatic injection of powdered metal is being pursued as an alternative to the monopropellant systems. The technology for utilizing carbon monoxide/oxygen, a potential Martian propellant, was studied in subscale ignition and rocket performance experiments.
    Schlagwort(e): PROPELLANTS AND FUELS
    Materialart: NASA-TM-105263 , E-6594 , NAS 1.15:105263 , International Astronautical Congress; Oct 05, 1991 - Oct 11, 1991; Montreal, Quebec; Canada
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
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