Encomium
发表于 2025-3-21 17:53:20
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MIME
发表于 2025-3-21 20:51:07
Book 1989nd cryogenics begins has ne ver been weB defined. Most workers in the field have chosen to restrict cryogenics to a tem perature range below -150°C (123 K). This is a reasonable dividing line since the normal boiling points of the more permanent gases, such as helium, hydrogen, neon, nitrogen, oxyg
watertight,
发表于 2025-3-22 04:08:04
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繁忙
发表于 2025-3-22 07:15:24
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micturition
发表于 2025-3-22 11:03:43
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使出神
发表于 2025-3-22 15:08:41
Properties of Cryogenic Fluids,f the “oxygen range” or the “hydrogen range.” Table 2.1 gives the normal (0.101 MPa or 1 atm) boiling temperature, the normal melting temperature, the critical temperature and pressure, and the normal latent heat of vaporization for these five cryogenic fluids and several other common cyrogens. Some
使出神
发表于 2025-3-22 19:52:02
Properties of Solids,f materials for the construction of cryogenic equipment will be dictated by consideration of mechanical and physical properties such as thermal conductivity (heat transfer along a structural member), thermal expansivity (expansion and contraction during cycling between ambient and low temperatures),
恃强凌弱
发表于 2025-3-22 21:37:11
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臭了生气
发表于 2025-3-23 05:19:24
Equipment Associated with Low-Temperature Systems,ring the influence of heat exchanger effectiveness on the liquid yield for a simple Joule-Thomson liquefaction process. For example, if the working fluid is nitrogen and the lower and upper pressure limits are 0.101 and 20.2 MPa, respectively, the liquid yield under these conditions will be zero for
澄清
发表于 2025-3-23 07:49:58
Separation and Purification Systems,the major source of commercial oxygen, nitrogen, neon, argon, krytpon, anxenon. The bulk of the commercial helium is currently obtained from helium-bearing natural gas where the separation is effected by a low-temperature process. The low-boiling components of natural gas, such as methane, ethane, a