36,120 research outputs found
On-site manufacture of propellant oxygen from lunar resources
The Aerojet Carbothermal Process for the manufacture of oxygen from lunar resources has three essential steps: the reduction of silicate with methane to form carbon monoxide and hydrogen; the reduction of carbon monoxide with hydrogen to form methane and water; and the electrolysis of water to form oxygen and hydrogen. This cyclic process does not depend upon the presence of water or water precursors in the lunar materials; it will produce oxygen from silicates regardless of their precise composition and fine structure. Research on the first step of the process was initiated by determining some of the operating conditions required to reduce igneous rock with carbon and silicon carbide. The initial phase of research on the second step is completed; quantitative conversion of carbon monoxide and hydrogen to methane and water was achieved with a nickel-on-kieselguhr catalyst. The equipment used in and the results obtained from these process studies are reported in detail
THE RESTRUCTURING OF SOUTHERN AGRICULTURE: DATA NEEDS FOR ECONOMIC AND POLICY RESEARCH: DISCUSSION
Agricultural and Food Policy,
A Primer to Relativistic MOND Theory
We first review the nonrelativistic lagrangian theory as a framework for the
MOND equation. Obstructions to a relativistic version of it are discussed
leading up to TeVeS, a relativistic tensor-vector-scalar field theory which
displays both MOND and Newtonian limits. The whys for its particular structure
are discussed and its achievements so far are summarized.Comment: 6 pages, LaTeX, 1 figure, to appear in proceedings of IAP05 in Paris:
Mass Profiles and Shapes of Cosmological Structures, G. Mamon, F. Combes, C.
Deffayet and B. Fort (eds), (EDP-Sciences 2005
Water impact loads
Computer program to generate time history of load factor and pressure on conical body of revolution during impact with water is discussed. Program calculates depth of penetration, velocity, force, load factor, maximum pressure at water line, and average pressure. Program is written in FORTRAN 4 Level H for IBM 360/85/195 Release 20.1 computer
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