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  1. Solar heating and cooling technical data and systems analysis : special progress report on non-residential solar energy survey and analysis demonstration program, July 1976-June 1977

    Christensen, David L.
    Washington : Dept. of Energy ; Springfield, Va. : for sale by the National Technical Information Service, 1977.

  2. Micro but mighty [electronic resource] : microrobots working in a macro world

    Christensen, David L.
    2016.

    The vision of microrobots working together to move human scale objects has long been in the imaginations of science fiction writers, but in practical terms this vision has been hard to achieve. Friction scales unfavorably with size reduction, so the ability to provide shear ground reaction forces is severely limited at small scales. This thesis examines the use of small robots that employ controllable adhesives, i.e., adhesives for which the magnitude of the adhesive pressure can be modulated by varying a quantity such as the applied shear force. The applications include robots for horizontal and vertical surfaces. The thesis also addresses the implications for actuation that accompany a desire to use controllable adhesion in small robots. Finally, the thesis examines the characteristics of small robots, and their mode of locomotion, that make them more or less suited for working in teams to produce much larger forces than each robot can produce individually.

  3. Booster main engine selection criteria for the liquid fly-back booster [microform]

    Ryan, Richard M.
    [Washington, D.C. : National Aeronautics and Space Administration ; Springfield, Va. : National Technical Information Service, distributor, 1998]

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