Showing papers in "Cryogenics in 1972"

TL;DR: In this paper, it was shown that the breakdown strength of gaseous helium is determined mainly by the gas density of the gas, and that the formation of gas bubbles produced by moving ions in the liquid leads to electrical breakdown.

TL;DR: In this article, three major areas of application of the Josephson effect are recognized; absolute standards, millimetre and sub-millimetre wave sensing, and dc and low-frequency current, voltage, and magnetic field sensing.

TL;DR: The elastic and plastic deformation behavior of high-purity aluminum and of dilute aluminum alloys is reviewed in this paper, including elastic moduli, elastic coefficients, tensile, creep, fatigue, hardness, and impact.

TL;DR: In this article, the structure of the intermediate state in superconducting lead films has been investigated as a function of magnetic field and film thickness, and the periodicity length of intermediate state structure was in reasonable agreement with the non-branching model of Landau.

TL;DR: In this paper, a conduction electron temperature of 0.37 mK, significantly lower than before, was achieved, and the nuclear stage could be kept below 2 mK for 12 hours.

TL;DR: A survey of the most recent developments in superconducting magnet materials is presented, and complete data on the upper critical field and transition temperature for the NbTi alloy system are given as mentioned in this paper.

TL;DR: In this article, the authors describe their experiments to reproduce terminal characteristics of a small piece of the conductor, placed in isothermal conditions and, in particular, to observe otherwise unstable portions of characteristics with the negative slope.

TL;DR: In this article, the authors proposed a dilution refrigerator based on the absorption of heat on dissolving He 3 in t te 4 in order to achieve temperature reduction to ~ 1 0 -1 to 10 -2 K.

TL;DR: In this article, a new method of establishing equations of state for pure fluid substances is demonstrated using nitrogen as an example, and with the aid of these equations exact phase equilibrium data can be calculated.

TL;DR: In this article, it was surmised that anomalous thermal conductances of Apiezon N and T grease are related to glass transition temperatures (T g (N) = 273 K and T g (T ) = 210 K ) of the greases.

TL;DR: In this article, a cryogenic MOSFET LC oscillator suitable for measurements of very small changes of the capacitance or inductance of the resonant circuit is described, with reference to measurements of oscillatory magnetostriction and NMR.

TL;DR: In this article, a pulsed nuclear magnetic resonance thermometer, constructed for temperature measurements below 0.5 K, is described and the nuclear free precession signal of copper nuclei is recorded with a gated low noise amplifier and with a phase sensitive detector gated to integrate the signal over an adjustable number of periods.

TL;DR: In this paper, the velocity of longitudinally and transversely polarized 10 MHz sound waves has been measured in four technical polymers (nylon, Teflon, and two epoxy resins) between 4 and 100K.

TL;DR: In this article, three different laboratory scale superconducting magnets wound from NbTi superconductors were made to investigate the enhancement of quench fields on cooling below 4.2 K. The enhancement was up to 25% at 2 K.

TL;DR: In this paper, Belker, E. G., De BOER, J. DUSHMAN, S. D., and MISENTA, R. P. have discussed the importance of the first-order logic in the analysis of the second-order graph.

TL;DR: In this paper, the authors used regression analysis techniques to fit the capacitance-temperature data for an 1100-type thermometer from 1.7 to 50 K (46 points) and for a 1200-type temperatureometer from 0.1 to 9 K (56 points).

TL;DR: In this paper, the eddy current decay method is used to measure the residual resistivity ratio in high purity metals. But the method is not suitable for large or irregular specimens or with increasing purity and decreasing temperature.

TL;DR: In this article, the influence of a magnetic field on the Seebeck effect for a copper-constantan thermocouple was studied and the magnetic field dependence of Seebeck voltage was found to be large.

TL;DR: In this article, the emergence of apparent resistance is discussed for different cases of inductive as well as of non-inductive coils wound with non-ideal type II superconductors and placed into an external magnetic field oscillating with some low frequency.

TL;DR: In this article, the critical current density of co-processed copper-clad Nb-25%Zr wire has been studied as a function of annealing time and temperature with reference to the use of this alloy in superconducting power transmission cable.

TL;DR: In this article, the accuracy of simple interpolation routines applied to cryogenic resistance thermometer calibrations is evaluated and it is shown that when only a small number of calibration points is available the simple methods give far greater accuracy than is possible using polynomial regression.

TL;DR: In this article, it was shown that flux lattice dislocations (FLDs) may be investigated by observing the alternating voltage accompanying an alternating current, which has the advantage that the FLDs are trapped within the sample and the observed ac voltages are constant.

TL;DR: In this article, a model of magnet needles floating vertically in cupric sulphate solution serve as a model for flux tubes, and a Lorentz force is exerted on the needles by passing a current through the solution.