cluster
发表于 2025-3-25 04:41:10
Frank Pobellghts to critically discuss the role of nurses and midwives in leadership, healthcare organisations, and research as well as the provision of particular forms of care e.g. care in t978-3-030-49106-2978-3-030-49104-8
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焦虑
发表于 2025-3-25 16:24:30
Properties of Cryoliquids,ids are very important for low-temperature physics because they are the simplest means of achieving low temperatures. In particular, the properties of liquid helium are essential because all refrigeration methods to T < 10 K use liquid helium as a final or intermediate refrigeration stage. I shall n
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Solid Matter at Low Temperatures,onstruction of low-temperature apparatus and for performing experiments with such apparatus. These properties are, in particular, the specific heat, thermal expansion, and thermal conductivity; some magnetic properties of solids will be discussed in later chapters in connection with magnetic cooling
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Thermal Contact and Thermal Isolation, and, in particular, from ambient temperature. The transfer of “heat” (or better “cold”) and the thermal isolation are essential considerations when designing a low-temperature apparatus. These problems become progressively more acute at lower temperatures, and they will be discussed in this chapter
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Helium-3 Cryostats,isotope .He is used instead of the common isotope .He. The main reason is that .He has a substantially larger vapour pressure than .He at the same temperature; the ratio P./P. is 74 at 1 K but about 10. at 0.5 K (Figs. 2.6,7). A further advantage of using liquid .He instead of liquid .He at temperat
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The 3He-4He Dilution Refrigerator,. 9). This method was then replaced for the temperature range down to 0.3 K by the .He refrigerator, as discussed in the preceding chapter. But in 1962 a new proposal for continuous refrigeration with liquid helium to even lower temperatures was published by H. London, G.R. Clarke, and E. Mendoza, b
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