The new generation of miniature 3He refrigerators, exploiting only the condensation and cryosorption cycles of 3He without moving parts and external links, represents the most common adopted solution in low temperature physics for cooling detectors such as bolometers at 0.3 K. The characteristics an
98/04144 An improved 3He refrigerator
- Book ID
- 104286592
- Publisher
- Elsevier Science
- Year
- 1998
- Weight
- 202 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0140-6701
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β¦ Synopsis
13 Space heating and cooling
98104134
Use of pitch-dolomite refractories in steelmaking ladles Chumarin, B. A. et al. Metalhug., 1997, (7) 13-16. (In Russian) Using pitch binder, lime-periclase refractories and the technology for lining ladles with the refractories were developed and implemented. The starting materials used were dolomite and coke pitch. A furnace for heat treatment of linings was developed and put into operation. The composition of the refractories fabricated was CaO 55.5-58.0%, MgO 35.0-37.0%, SiOa 2.5-3.0% and RsOs 3.0-4.0%, they had a density of 2.91-2.93 g/cm3 and a tensile strength of 40-60 MPa.
π SIMILAR VOLUMES
The characteristics and performance of an improved 3He/4He double stage refrigerator are presented. It is based on the same principle as the previous double stage refrigerator described in reference 1. A new geometry was used to overcome both the extra thermal input due to gas convection in the cond
QT n -(4) L At the low temperature end, T = 4.2 K and (5) and the parameters p, A, X, Cp are constant and over a short length near the end the temperature variation can be taken as linear, which means that d2T -0 dx 2 From (3), (4), and (5) LI2pX 1 QT-Cp QL By differentiating dQT LI2 pX 1 dQL Cp Q~
adhesion. Four electrical leads were soldered on the contact areas with the pure indium.