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  • 1
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    Lunar hand tools (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Tools useful for operations and maintenance tasks on the lunar surface were determined and designed. Primary constraints are the lunar environment, the astronaut's space suit and the strength limits of the astronaut on the moon. A multipurpose rotary motion tool and a collapsible tool carrier were designed. For the rotary tool, a brushless motor and controls were specified, a material for the housing was chosen, bearings and lubrication were recommended and a planetary reduction gear attachment was designed. The tool carrier was designed primarily for ease of access to the tools and fasteners. A material was selected and structural analysis was performed on the carrier. Recommendations were made about the limitations of human performance and about possible attachments to the torque driver.
    Keywords: ENGINEERING (GENERAL)
    Type: NASA-CR-184924 , NAS 1.26:184924 , ME-4182
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A users evaluation of SAMIS (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: SAMIS, the Solar Array Manufacturing Industry Simulation computer program was developed by Jet Propulsion Laboratories (JPL) to provide a method whereby manufacturers or potential manufacturers of photovoltaics could simulate a solar industry using their own particular approach. This paper analyzes the usefulness of SAMIS to a growing photovoltaic industry and clearly illustrates its limitations as viewed by an industrial user.
    Keywords: ENGINEERING (GENERAL)
    Type: Photovoltaic Specialists Conference; May 12, 1981 - May 15, 1981; Kissimmee, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A base-metal conductor system for silicon solar cells (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Solder, copper, and silver are evaluated as conductor layer metals for silicon solar cell metallization on the basis of metal price stability and reliability under operating conditions. Due to its properties and cost, copper becomes an attractive candidate for the conductor layer. It is shown that nickel operates as an excellent diffusion barrier between copper and silicon while simultaneously serving as an electrical contact and mechanical contact to silicon. The nickel-copper system may be applied to the silicon by plating techniques utilizing a variety of plating bath compositions. Solar cells having excellent current-voltage characteristics are fabricated to demonstrate the nickel-copper metallization system.
    Keywords: ENGINEERING (GENERAL)
    Type: Photovoltaic Specialists Conference; Jan 07, 1980 - Jan 10, 1980; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Ignition of PTFE-lined flexible hoses by rapid pressurization with oxygen (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A high-volume pneumatic-impact system has been used to test PTFE-lined stainless steel braided hoses, in order to characterize the roles played in the mechanism of oxygen-induced ignition by impact pressure, pressurization rate, and upstream and downstream volumes of the hose. Ignitions are noted to have occurred at impact pressures well below the working pressure of the hoses, as well as at pressurization rates easily obtainable through manual operation of valves. The use of stainless steel hardlines downstream of the hose prevented ignitions at all pressures and pressurization rates; internal observations have shown evidence of shock ionization in the oxygen prior to ignition.
    Keywords: ENGINEERING (GENERAL)
    Type: International Symposium on Flammability and sensitivity of materials in oxygen-enriched atmospheres; Apr 11, 1989 - Apr 13, 1989; Las Cruces, NM; United States
    Format: text
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    NASA TECHNICAL REPORTS
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