[en] Computations have been performed for flat plate efficiency factor, heat removal factor, heat gained by fluid for different materials used for the tubes and fins of flat plate tubular solar collectors. 3 refs, 17 figs, 4 tabs

[en] We studied the following four models of constructing solar collectors: tubes bonded above the absorber plate, tubes bonded under the absorber plate tubes in-line with the absorber plate and bondless tubes in-line with the absorber plate. 2 refs, 6 figs

[en] Positive, or at least neutral, community perceptions about, and reactions toward, geothermal development activities are desirable and necessary from exploration permit acquisition throughout the life of a project. This paper reports on developing an informal network of contacts throughout the impacted and adjacent communities with which to initiate and maintain meaningful dialogue and feedback that can be a valuable tool toward this end

[en] Nuclear, Te, Ti Project Briefs describe the status of all RandD programs submitted to the Power Information Center by the government sponsors in energy conversion from fission, fusion, and radioisotope power sources and other thermal systems that use thermionic systems. These briefs also follow related investigations of plasma dynamics. The document is not to be reproduced, in whole or in part, for dissemination outside your own organization nor may it be reproduced for advertising or sales promotion purposes

[en] Solar scientist are well aware of the low energy density of solar radiation. A fully tracking collector at the sunniest spot on this planet will receive a little excess of 3000 kWh per year per m² of solar radiation (beam plus diffused). In most places the figure is far lower. Conversion efficiencies, from solar radiation to electricity, vary from a fraction of 1% for a photo-synthesis-hybrid-thermal converter, to to a maximum well below 40% for the highest temperature thermal systems. It is this low output per unit area that presents the major problem in achieving economic viability, discontinuity in the energy supply being, by comparison, a minor inconvenience. The economics of various solar conversion systems is presented, using an unsophisticated approach in order to see more vividly the issues involved. Economic viability depends not only on cost and output but on the cost of alternatively energy supplies at site in question

[en] This work is a collection of technical terms related to nuclear and solar energies. (author)

[en] This paper describes the Solar Energy Research Institute (SERI) cost estimates for solar water detoxification systems based on the best available information as of October 1990. Comparative costs are also provided for competitive conventional technologies which are presently applied in the water detoxification market. Although costs for solar photocatalytic systems are presently higher than those of competitive technologies, cost and performance improvements should lead to cost competitiveness by 1995

[en] The continuing glut of oil and low energy prices are putting the renewable energy sources (solar, wind power, etc.) in a quandary. Although being much more expensive than the conventional energy sources, the renewable sources bear the advantage of being much more compatible with the interests of the environment and society, so that politicians increasingly call for more financial support for the development of the renewable energy sources. A closer look at the problems involved in these new energy techniques, however, describes the politicians' approach to be rather blue-eyed. (orig.)

[en] The method is based on the Bethe level density expression, where the parameters are used with constraints. It is aplied to the level density of compound resonances observed at neutron separation energy. The change in the pairing energy compared with the ground state value determined by mass differences is discussed for different mass regions. (author). 6 figs., 12 refs

[en] Today, Luz is the world's most experienced and successful producer of solar thermal power stations, with 100 Megawatts of solar power already on the power grid of the southern California Edison utility company, and another 480 Megawatts to be added by 1992. Producing a significant percentage of all the solar-generated power throughout the world, Luz has made the solar energy competitive with that of conventional fossil fuels, a welcome development for a world which must face the environmental effects of power production and the prospect of dwindling fossil fuel resources