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Ultra-high vacuum (often spelled ultrahigh in American English, UHV) is the vacuum regime characterised by pressures lower than about 1 × 10 −6 pascals (1.0 × 10 −8 mbar; 7.5 × 10 −9 Torr). UHV conditions are created by pumping the gas out of a UHV chamber.
Ion pumps are commonly used in ultra-high vacuum (UHV) systems, as they can attain ultimate pressures less than 10 −11 mbar. [1] In contrast to other common UHV pumps, such as turbomolecular pumps and diffusion pumps, ion pumps have no moving parts and use no oil. They are therefore clean, need little maintenance, and produce no vibrations.
UHV may refer to: Ultra-high vacuum, the vacuum regime characterised by pressures lower than about 10 −7 pascal; Ultra-high voltage, a classification of overhead power line with an operating voltage of higher than 800 kV; University of Houston–Victoria, a university in Victoria, Texas, US
In addition, in a section of the Anguttara Nikaya known as the "Snap of the Fingers Section" (AN 1.16.6, Accharāsaṇghātavaggo), the Buddha is recorded as stating that, if a monk were to enact one of the four right exertions for the snap of the fingers (or, "only for one moment") [7] then "he abides in jhana, has done his duties by the ...
[11] [7] To reduce transmission losses to a manageable level, UHV transmission is a logical choice. As the State Grid Corporation of China announced at the 2009 International Conference on UHV Power Transmission in Beijing, China will invest RMB 600 billion (approximately US$88 billion) into UHV development between now and 2020. [12]
10 7: 25.5 MV The largest man-made DC voltage – produced in a Van de Graaff generator at Oak Ridge National Laboratory [33] 10 8: 100 MV The potential difference between the ends of a typical lightning bolt [34] Peta-10 15: 7 PV Voltage around a particular energetic highly magnetized rotating neutron star [35] Ronna-10 27: 1.04 RV Planck voltage
Nevertheless, moving from a 100 kW low-VHF analog signal to a 1 MW UHF signal is still a considerable change, which some broadcasters estimated could cost up to $4 million per station (although most estimates were much lower, on the order of $400,000). For this reason, channels in the high-VHF region were kept for television use.
1 UHV manipulator. 1 comment. 2 what the hell. 2 comments. 3 Ultra high vacuum has more affect on energy geometrical engineering. 1 comment. 4 RE: Material Limitations.