Country of Origin: United States. Country of Publication: United States Document Type: CONFERENCE PAPER Most documents available from AI A A Technical Library Other Availability: NTIS HC A02/MF AOI Journal Announcement: STAR8412 A novel method called “Dynamic Velocity Taper” to linearize the Pout versus Pin transfer characteristic that does not require any extraneous circuitry or tuning, has large bandwidth capabilities (10 percent) and offers also an increase in the intrinsic traveling wave tube (TWT) efficiency by 1 to 2 dB is described. In addition, the method permits the TWT to be operated at or near the synchronous voltage (b plus or minus o) which produces a flat small and large signal and gain responses and low AM to PM conversion. The physics of the method and experimental verification are given. The implementation should have a significant impact on TWT performance and increase the channel capacity of communication satellites. (R.J.F.) Source of Abstract (Subfile): NASA STIF Descriptors: ‘LINEARIZATION; ‘PHASE VELOCITY; ‘TRANSFER FUNCTIONS; ‘TRAVELLING WAVE AMPLIFIERS; ‘TRAVELING WAVE TUBES; COMMUNICATION SATELLITES; EFFICIENCY; ELECTRONS; TAPERING; VELOCITY DISTRIBUTION Subject Classification: 7533 Electronics & Electrical Engineering (1975- ) Economics of d.c. power applications of phosphoric acid fuel cells utilizing co-product hydrogen CASSON, H. V. (Huron Chemicals, Ltd., Kingston, Ontario, Canada) International Journal of Hydrogen Energy (ISSN 0360-3199), vol. 9, no. 1-2, 1984, p. 81-94. 8 Refs. Language: English Country of Origin: Canada. Country of Publication: United Kingdom Document Type: JOURNAL ARTICLE Most documents available from AI A A Technical Library Journal Announcement: IAA8408 Source of Abstract (Subfile): AIAA/TIS Descriptors: ‘DIRECT CURRENT; ‘ECONOMIC ANALYSIS; ‘ELECTRIC POWER PLANTS; ‘ELECTROLYSIS; ‘HYDROGEN PRODUCTION; ‘PHOSPHORIC ACID FUEL CELLS; COST EFFECTIVENESS; HYDROGEN-BASED ENERGY; TECHNICOLOGICAL FORECASTING Subject Classification: 7544 Energy Production & Conversion (1975- ) Effect of finite angular width of the sun on design and concentration characteristics of a Fresnel- Winston tandem concentrator system SAWHNEY, R. L.; ARO, T. O. (Ilorin University, Ilorin, Nigeria) International Journal of Energy Research (ISSN 0363-907X), vol. 7, Oct.-Dec. 1983, p. 303-314. 6 refs. Language: English Country of Origin: Nigeria. Country of Publication: United Kingdom Document Type: JOURNAL ARTICLE Most documents available from AI A A Technical Library Journal Announcement: IAA8408
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