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  • Other Sources  (4)
  • Man/System Technology and Life Support  (4)
  • 2020-2024
  • 2015-2019  (2)
  • 2010-2014  (2)
  • 1940-1944
  • 1
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    Metal-Matrix/Hollow-Ceramic-Sphere Composites (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A family of metal/ceramic composite materials has been developed that are relatively inexpensive, lightweight alternatives to structural materials that are typified by beryllium, aluminum, and graphite/epoxy composites. These metal/ceramic composites were originally intended to replace beryllium (which is toxic and expensive) as a structural material for lightweight mirrors for aerospace applications. These materials also have potential utility in automotive and many other terrestrial applications in which there are requirements for lightweight materials that have high strengths and other tailorable properties as described below. The ceramic component of a material in this family consists of hollow ceramic spheres that have been formulated to be lightweight (0.5 g/cm3) and have high crush strength [40.80 ksi (.276.552 MPa)]. The hollow spheres are coated with a metal to enhance a specific performance . such as shielding against radiation (cosmic rays or x rays) or against electromagnetic interference at radio and lower frequencies, or a material to reduce the coefficient of thermal expansion (CTE) of the final composite material, and/or materials to mitigate any mismatch between the spheres and the matrix metal. Because of the high crush strength of the spheres, the initial composite workpiece can be forged or extruded into a high-strength part. The total time taken in processing from the raw ingredients to a finished part is typically 10 to 14 days depending on machining required.
    Keywords: Man/System Technology and Life Support
    Type: GSC-15348-1 , NASA Tech Briefs, September 2011; 15-16
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    High-Voltage Clock Driver for Photon-Counting CCD Characterization (2013)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A document discusses the CCD97 from e2v technologies as it is being evaluated at Goddard Space Flight Center's Detector Characterization Laboratory (DCL) for possible use in ultra-low background noise space astronomy applications, such as Terrestrial Planet Finder Coronagraph (TPF-C). The CCD97 includes a photoncounting mode where the equivalent output noise is less than one electron. Use of this mode requires a clock signal at a voltage level greater than the level achievable by the existing CCD (charge-coupled-device) electronics. A high-voltage waveform generator has been developed in code 660/601 to support the CCD97 evaluation. The unit generates required clock waveforms at voltage levels from -20 to +50 V. It deals with standard and arbitrary waveforms and supports pixel rates from 50 to 500 kHz. The system is designed to interface with existing Leach CCD electronics.
    Keywords: Man/System Technology and Life Support
    Type: GSC-15059-1 , NASA Tech Briefs, October 2013; 29
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Advanced Oxygen Generation Assembly for Exploration Missions (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-07
    Description: Future Exploration missions will require an Oxygen Generation Assembly (OGA) to electrolyze water to supply oxygen for crew metabolic consumption. The system design will be based on the International Space Station (ISS) OGA but with added improvements based on lessons learned during ISS operations and technological advances since the original OGA was designed and built. These improvements will reduce system weight, crew maintenance time and spares mass while increasing reliability. Currently, the design team is investigating the feasibility of the upgrades by performing ground tests and analyses. Upgrades being considered include: redesign of the electrolysis cell stack, deletion of the hydrogen dome, replacement of the hydrogen sensors, deletion of the wastewater interface, redesign of the recirculation loop deionizing bed and redesign of the cell stack Power Supply Module. The upgrades will be first demonstrated on the ISS OGA.
    Keywords: Man/System Technology and Life Support
    Type: M19-7382 , International Conference on Environmental Systems (ICES 2019); Jul 07, 2019 - Jul 11, 2019; Boston, MA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    EVA Suit Microbial Leakage Investigation Project (2016)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The objective of this project is to collect microbial samples from various EVA suits to determine how much microbial contamination is typically released during simulated planetary exploration activities. Data will be released to the planetary protection and science communities, and advanced EVA system designers. In the best case scenario, we will discover that very little microbial contamination leaks from our current or prototype suit designs, in the worst case scenario, we will identify leak paths, learn more about what affects leakage--and we'll have a new, flight-certified swab tool for our EVA toolbox.
    Keywords: Man/System Technology and Life Support
    Type: JSC-CN-35307
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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