TABUNOV, V. P.; TAMBIEV, IU. A.; IAKUBOVICH, S. D. (Vsesoiuznyi Nauchno- Issledovatel'skii Institut Optiko-Fizicheskikh Izmerenii, Moscow USSR) (Kvantovaia Elektronika/Moscow/, vol. 10, Mar. 1983, p. 598-602), Soviet Journal of Quantum Electronics (ISSN 0049-1748), vol. 13, March 1983, p.354-357. Translation. 13 Refs. Language: English Country of Origin: USSR. Country of Publication: United States Document Type: JOURNAL ARTICLE; TRANSLATION Most documents available from AI A A Technical Library Journal Announcement: IAA8405 The experimental data reported are obtained in GaAlAs double heterostructures with an amplifying layer about 9.2 microns thick that is doped with germanium to concentrations of about 10 to the 18th per cu cm; the aluminum content in this layer is approximately 10 percent, corresponding to a band gap of 1.51 eV at room temperature. Carriers are injected into a linear array of narrow regions under contact strips 15 microns wide and 250 microns long; these are separated by insulating gaps 30 microns wide and are characterized by a decoupling resistance between the strips amounting to about 25 ohms. Changing the number of switched-on strips makes it possible to vary the total length of the amplification channel. A satisfactory generalization of the gain profile is obtained in the form of expressions analogous to those that follow from the usual model of heavily doped gallium arsenide in which transitions occur between the density-of-states tail at the bottom of the conduction band and a local level, violating the selection rules on the quasi-momentum. (C.R.) Source of Abstract (Subfile): AIAA/TIS Descriptors: ‘ALUMINUM ARSENIDES; ‘ENERGY CONVERSION EFFICIENCY; ‘GALLIUM ARSENIDE LASERS; ‘HETEROJUNCTIONS; ‘INJECTION LASERS; ‘LASER OUTPUTS; EMISSION SPECTRA; LASING Subject Classification: 7536 Lasers & Masers (1975- ) Experimental performance characterization of line-focus collectors LUKENS, L. L. (Sandia National Laboratory, Albuquerque, NM) ASME, Transactions, Journal of Solar Energy Engineering (ISSN 0199-6231), vol. 105, Nov. 1983, p. 408-412. Research supported by the US Department of Energy. Language: English Country of Origin: United States. Country of Publication: United States Document Type: JOURNAL ARTICLE Most documents available from AI A A Technical Library Journal Announcement: IAA8404 To be able to predict accurately the performance of a specific solar collector in a given environment, its performance must first be characterized over the range of conditions under which the collector is expected to operate. In the present paper, collector performance models are developed for parabolic-trough and compound- parabolic-type concentrating collectors. Experimental collector-performance data from Sandia National Laboratories (Albuquerque, New Mexico) and Wyle Laboratories (Huntsville, Alabama) are used in a multiple-linear regression analysis to identify significant independent variables and refine the collector-performance models. The refined collector-performance models are used to characterize performance of three different parabolic-trough collectors and two different compound-parabolic collectors, with good correlations between modeled and experimental performance. (Author).
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