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  • 1
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    AMTEC vapor-vapor series connected cells (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An alkali metal thermoelectric converter (AMTEC) having a plurality of cells structurally connected in series to form a septum dividing a plenum into two chambers, and electrically connected in series, is provided with porous metal anodes and porous metal cathodes in the cells. The cells may be planar or annular, and in either case a metal alkali vapor at a high temperature is provided to the plenum through one chamber on one side of the wall and returned to a vapor boiler after condensation at a chamber on the other side of the wall in the plenum. If the cells are annular, a heating core may be placed along the axis of the stacked cells. This arrangement of series-connected cells allows efficient generation of power at high voltage and low current.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Organic cathode for a secondary battery (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A liquid catholyte for a battery based on liquid metal such as sodium anode and a solid, ceramic separator such as beta alumina (BASE) comprises a mixture of a Group I-III metal salt such as sodium tetrachloroaluminate and a minor amount of an organic carbonitrile depolarizer having at least one adjacent ethylenic band such as 1 to 40 percent by weight of tetracyanoethylene. The tetracyanoethylene forms an adduct with the molten metal salt.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
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    NASA TECHNICAL REPORTS
  • 3
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    High power density electrodes for AMTEC (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Trilayer tungsten/platinum electrodes have provided dramatic improvements in stable power densities in alkali metal thermoelectric converters (AMTEC) experimental cells. The specific power density required to achieve a system conversion efficiency of approximately 15 percent or more with temperatures appropriate to space nuclear power sources is examined. Thus, if the observed power densities are sustained for thousands of hours, prototype AMTEC space nuclear power systems can be designed and tested.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: New Mexico Univ., Transactions of the Fifth Symposium on Space Nuclear Power Systems; p 621-623
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Non-volatile, solid state bistable electrical switch (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A bistable switching element is made of a material whose electrical resistance reversibly decreases in response to intercalation by positive ions. Flow of positive ions between the bistable switching element and a positive ion source is controlled by means of an electrical potential applied across a thermal switching element. The material of the thermal switching element generates heat in response to electrical current flow therethrough, which in turn causes the material to undergo a thermal phase transition from a high electrical resistance state to a low electrical resistance state as the temperature increases above a predetermined value. Application of the electrical potential in one direction renders the thermal switching element conductive to pass electron current out of the ion source. This causes positive ions to flow from the source into the bistable switching element and intercalate the same to produce a non-volatile, low resistance logic state. Application of the electrical potential in the opposite direction causes reverse current flow which de-intercalates the bistable logic switching element and produces a high resistance logic state.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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