By F. R. Schwartzberg, T. F. Kiefer, R. D. Keys (auth.), K. D. Timmerhaus (eds.)

Support from the nationwide technology starting place has made it attainable for the 10th annual Cryogenic Engineering convention, hosted via the college of Pennsylvania and capably directed through okay. R. Atkins and his employees, to stress the most important foreign advances in cryogenic engineering. This particular emphasis ended in a last software of over 100 papers and has made it essential to put up the lawsuits of the convention in volumes. the 1st quantity should be related in nature to past volumes during this sequence, whereas the second one quantity will characteristic the foreign point of the convention application. The latter quantity, due to this contrast, can be entitled overseas Advances in Cryogenic Engineering. As long ago, the Cryogenic Engineering convention Committee gratefully acknow­ ledges the help of all of the devoted employees within the cryogenic box who've contributed their time in reviewing the initial papers for this system and the ultimate manuscripts for this quantity. because the checklist of members during this thankless job numbers good over 100, any try and recognize their person contributions within the constrained area to be had will be virtually impossible.

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Liquid helium was used in tests to simulate the liquid-hydrogen temperature and was supplied from a 50-liter dewar through the vacuum-jacketed transfer tube when the solenoid valve was energized. A copper-constantan thermocouple which contacted the impact test specimen under spring tension just below the point of impact permitted an accuracy of the specimen temperature at impact of ± 1°C. -thick plate of 2219-T87 aluminum. The material was chemically cleaned, and the joint surfaces were hand scraped to remove excessive oxides before welding.

125 in. 125 in. , % in area, % N-Uit/Un-Ult Table V, Average Tensile Properties of Aluminum Alloys 1@ 1@ 1@ 1U,2N 1@ 1@ 1@ 1@ 1@ 2@ lU,2N 8U,5N 2U,7N 3U,7N 3U,9N 4@ 2@ lU,4N 2@ 2U,4N 2@ 2U,4N 2@ 4@ 4@ 4@ 4@ 2@ 4@ 4@ Number of tests N ... Iii Iii' f... II) I» '"n Co n ;- ~ 00 e, -3 i0' Q ~ W. Weleft', H. S. McQueen, and W. F. ". 0 - 110 100 ... tilII:: ... -II • I......... Notched~ 3. VleWStrqth 120 / 1 40 IIJ II:: ~ V/ 45 iii til 35 ... 010 STRAI N,INCHES PER INCH Fig.

Shear Moduli Determinations The experimental procedure used to determine the shear moduli of AlSI 302, 303, and 310 stainless steels is discussed by Mikesell and McClintock [3]. However, in all cases 46 47 An Anomalous Decrease of the Elastic Moduli at Very Low Temperatures Table I. 7 ASTM grain size Condition Annealed Cold-drawn 14%, 8% body-centered martensite Annealed Cold-drawn 5 % Cold-drawn 13 % Annealed Cold-drawn 11 %, no body-cen tered martensite 5 5 6 6 7 2 2 two different specimens were used, and Table I lists the chemical composition and conditions of the materials.

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