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  • 1
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    Concepts of flywheels for energy storage using autostable high-T(sub c) superconducting magnetic bearings (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A flywheel for energy storage using autostable high-T(sub c) superconducting magnetic bearings has been built. The rotating disk has a total weight of 2.8 kg. The maximum speed is 9240 rpm. A process that allows accelerated, reliable and reproducible production of melt-textured superconducting material used for the bearings has been developed. In order to define optimum configurations for radial and axial bearings, interaction forces in three dimensions and vertical and horizontal stiffness have been measured between superconductors and permanent magnets in different geometries and various shapes. Static as well as dynamic measurements have been performed. Results are being reported and compared to theoretical models.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Langley Research Center, Second International Symposium on Magnetic Suspension Technology, Part 2; p 529-542
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Conceptual design of a self-deployable, high performance parabolic concentrator for advanced solar-dynamic power systems (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: NASA has initiated technology development programs to develop advanced solar dynamic power systems and components for space applications beyond 2000. Conceptual design work that was performed is described. The main efforts were the: (1) conceptual design of self-deploying, high-performance parabolic concentrator; and (2) materials selection for a lightweight, shape-stable concentrator. The deployment concept utilizes rigid gore-shaped reflective panels. The assembled concentrator takes an annular shape with a void in the center. This deployable concentrator concept is applicable to a range of solar dynamic power systems of 25 kW sub e to in excess of 75 kW sub e. The concept allows for a family of power system sizes all using the same packaging and deployment technique. The primary structural material selected for the concentrator is a polyethyl ethylketone/carbon fiber composite also referred to as APC-2 or Vitrex. This composite has a nearly neutral coefficient of thermal expansion which leads to shape stable characteristics under thermal gradient conditions. Substantial efforts were undertaken to produce a highly specular surface on the composite. The overall coefficient of thermal expansion of the composite laminate is near zero, but thermally induced stresses due to micro-movement of the fibers and matrix in relation to each other cause the surface to become nonspecular.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-187061 , NAS 1.26:187061
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Evaluation of the minority carrier diffusion length and surface-recombination velocity in GaAs p/n solar cells (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The minority carrier diffusion length (Lp) and the surface recombination velocity (Vs) were measured as a function of distance (x) from the p-n junction in GaAs p/n concentrator solar cells. The measured Vs values were used in a theoretical expression for the normalized electron-beam-induced current. A fitting procedure was then used to fit this expression with experimental values to obtain Lp. The results show that both Vs and Lp vary with x. Lp measured in irradiated cells showed a marked reduction. These values were compared to those measured previously which did not account for Vs.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Photovoltaic Specialists Conference; Oct 07, 1991 - Oct 11, 1991; Las Vegas, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
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