The work described was directed toward the demonstration of the practical feasibility of the Floating Substrate Process for the growth of silicon sheet. Supercooling of silicon--tin alloy melts was studied. Values as high as 78/sup 0/C at 1100/sup 0/C and 39/sup 0/C at 1200/sup 0/C were observed, corresponding to supersaturation parameter values 0.025 and 0.053 at 1050/sup 0/C and 1150/sup 0/C, respectively. The interaction of tin with silane gas streams was investigated over the temperature range 1000 to 1200/sup 0/C. Single-pass conversion efficiencies exceeding 30% were obtained. The growth habit of spontaneously-nucleated surface growth was determined to be consistent with dendritic and web growth from <111> singly-twinned triangular nucleii. Surface growth of interlocking silicon crystals, thin enough to follow the surface of the liquid and with growth velocity as high as 5 mm/min, was obtained. Large area single-crystal growth along the melt surface was not achieved. Small single-crystal surface growth was obtained which did not propagate beyond a few millimeters. The probable reason for the polycrystalline growth is the poisoning of the growth interface by impurities.

In a general high-beta guiding-center MHD equilibrium of an anisotropic minimum-B mirror-trapped plasma, stability is determined by the sign of the Kruskal-Oberman energy variation. The energy variation is given for near-marginally-stable line-localized perturbations, and within a positive factor. A brief theoretical discussion of various instabilities for different conditions is given. (MOW)

This report summarizes the economic and financial conditions pertaining to geothermal electric power plant utilization of geothermal fluids produced from the Roosevelt Hot springs area of Utah. The first year of electric power generation is scheduled to be 1982. The non-resource facilities will be called ''surface facilities'' and include the gathering system, the power plant, the substation, and the injection system.

The procedures used and the results obtained during the evaluation test program on the Calmac Manufacturing Company, S.N.1, (Liquid) Solar Collector are presented. The flat-plate collector uses water as the working fluid. The absorber plate is aluminum with plastic tubes coated with Urethane black. The glazing consists of a single .040&#x27;&#x27; Fiberglas reinforced polyester (Kalwall). The collector weight is 78.5 pounds with overall external dimensions of approximately 50.3&#x27;&#x27; x 98.3&#x27;&#x27; x 3.8&#x27;&#x27;. The test program was conducted to obtain the following information: Thermal performance data under simulated conditions, structural behavior under static loading and the effects of long-term exposure to natural weathering. These tests were conducted using the MSFC Solar Simulator.