Source of Abstract (Subfile): AIAA/TIS Descriptors: *ENERGY CONVERSION EFFICIENCY; *PERFORMANCE PREDICTION; *SOLAR COLLECTORS; CONCENTRATORS; PARABOLIC REFLECTORS; POWER EFFICIENCY; REGRESSION ANALYSIS; TROUGHS Subject Classification: 7544 Energy Production & Conversion (1975- ) Amorphous silicon solar cells with graded boron-doped active layers SICHANUGRIST, P.; KUMADA, M.; KONAGAI, M.; TAKAHASHI, K. (Tokyo Institute of Technology, Tokyo, Japan); KOMRI, K. (Tokyo Institute of Technology; Showa Oil Co., Tokyo, Japan) Journal of Applied Physics (ISSN 0021-8979), vol. 54, Nov. 1983, p. 6705-6707. 9 Refs. Language: English Country of Origin: Japan. Country of Publication: United States Document Type: JOURNAL ARTICLE Most documents available from AI A A Technical Library Journal Announcement: IAA8403 The effect of graded boron doping in the actives (i layers) of hydrogenated amorphous silicon p-i-n solar cells was investigated. It was found that the cell characteristics strongly depend on the doping profile. A high conversion efficiency of 9.45 percent was obtained by gradually doping the i layer with boron in order to achieve a linear profile from the p/i to i/n interface. The best fill factor observed was 0.72. (Author) Source of Abstract (Subfile): AIAA/TIS Descriptors: *AMORPHOUS SEMICONDUCTORS; *BORON HYDRIDES; *DOPED CRYSTALS; *ENERGY CONVERSION EFFICIENCY; *SOLAR CELLS; P-I-N JUNCTIONS; PLASMA SPRAYING; VOLT-AMPERE CHARACTERISTICS Subject Classification: 7544 Energy Production & Conversion (1975- ) An LQ-solution to a control problem associated with a solar thermal central receiver SWORDER, D. D. (California, University, La Jolla, CA); ROGERS, R. O. (Aerospace Corp., El Segundo, CA) IEEE Transactions on Automatic Control (ISSN 0018-9286), vol. AC-28, Oct. 1983, p. 971-978. 11 Refs. Contract No.: DE-AC03-78ET-20517; NSF ECS-80-03547 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: IAA8403 The linearized process dynamics of the steam boiler in a solar-powered central receiver change abruptly when clouds interfere with sun's rays. The steam temperature regulator used to maintain proper exit steam conditions must control a system with variable structure and discontinuous state trajectories. This paper investigates the quadratic-optimal control of such a system, and gives the design equations for the optimal regulator. (Author) Source of Abstract (Subfile): AIAA/TIS
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