摘要 :
Certain UHF television channel combinations and transmitter minimum mileage separations are known as UHF taboos. These taboos are intended to protect receivers from interference and are based on UHF receiver performance when subje...
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Certain UHF television channel combinations and transmitter minimum mileage separations are known as UHF taboos. These taboos are intended to protect receivers from interference and are based on UHF receiver performance when subjected to signals on UHF taboo channels. The paper gives data for sixteen television receivers subjected to UHF taboo channel combinations. It also compares the UHF performance to VHF performance data obtained for a combination of VHF channels. The paper suggests that a VHF reference performance can be used as one indication of the need for UHF taboo mileage separations. The particular VHF reference channel combination chosen is desired channel n with undesired channels n+2 and n+4. Such assignments are made at VHF without mileage separation requirements. The paper suggests that, using the VHF service as a model, similar assignments could be made for UHF taboo channels if the UHF performance was better than or equal to the VHF reference. Comparisons are given of UHF performance with the VHF reference.
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摘要 :
Progress in the worldwide capability of predicting the convective energy loss from solar central receivers is reviewed. The significant advances in the past three years have been in experimental areas. Baseline measurements of the...
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Progress in the worldwide capability of predicting the convective energy loss from solar central receivers is reviewed. The significant advances in the past three years have been in experimental areas. Baseline measurements of the convective heat transfer from large high-temperature surfaces, e.g., a flat plate and a cubical cavity, have been completed and empirical correlations have been obtained. Theoretical modeling activities have not kept pace with the experimental advances, however. Currently, the primary theoretical emphasis is the development and testing of turbulence models suitable for buoyant flows. Three major needs have been identified: the measurement of convective energy losses from operating solar central receivers; the continued development of theoretical models in spite of the relatively slow progress to date; and the quantification of the effects of atmospheric turbulence. (ERA citation 08:038768)
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摘要 :
The prime contractors and subcontractors of the Central Receiver Solar Thermal Power System, Phase I contract teams are tabulated and the schedules are graphed for the 10 MW/sub e/ Pilot Plant Project and for the Central Receiver ...
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The prime contractors and subcontractors of the Central Receiver Solar Thermal Power System, Phase I contract teams are tabulated and the schedules are graphed for the 10 MW/sub e/ Pilot Plant Project and for the Central Receiver and Test Facilities Program. Preliminary characteristics are listed for preliminary designs of the 10 MW/sub e/ pilot plant under study by the four contractor teams, and the heliostat field layouts, heliostats, receivers, and power systems proposed by each team are diagrammed. A series of action items and statements by the contractors and Sandia is attached.
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