Semiautomatic bridge for high‐precision dc resistance measurements on pure metals at low temperatures

1979 ◽  
Vol 50 (2) ◽  
pp. 161-164 ◽  
Author(s):  
H. van Kempen ◽  
H. W. Neyenhuisen ◽  
J. H. J. M. Ribot
Keyword(s):  
High Precision ◽  
Low Temperatures ◽  
Pure Metals ◽  
Dc Resistance

LORENZ NUMBERS OF PURE ALUMINUM, SILVER, AND GOLD AT LOW TEMPERATURES

1963 ◽  
Vol 41 (12) ◽  
pp. 2026-2033 ◽  
Author(s):  
E. W. Fenton ◽  
J. S. Rogers ◽  
S. B. Woods
Keyword(s):  
Low Temperatures ◽  
Experimental Error ◽  
Pure Aluminum ◽  
Electron Interaction ◽  
Lorenz Number ◽  
Electrical Conductivities ◽  
Lattice Waves ◽  
Pure Metals

Measurements have been made of the thermal and electrical conductivities at low temperatures on specimens of pure aluminum, silver, and gold. The resistivities caused by scattering of the electrons by lattice waves and by impurities have been separated and the Lorenz number has been deduced for these specimens. The Lorenz number calculated from the impurity resistivities for these pure metals agrees with the theoretical Sommerfeld value within an experimental error of about [Formula: see text]. The possible influence of an electron–electron interaction on these results is discussed.

scholarly journals Borehole multi-functional logger for geophysical high-precision monitoring in Antarctic and Greenland ice sheets and glaciers

2021 ◽  
pp. 1-11
Author(s):  
Aleksey Markov ◽  
Pavel Talalay ◽  
Mikhail Sysoev ◽  
Andrey Miller ◽  
Alexander Cherepakhin
Keyword(s):  
High Precision ◽  
Cross Sections ◽  
Low Temperatures ◽  
High Pressures ◽  
Ice Sheets ◽  
Dome A ◽  
Lake Vostok ◽  
Pressure Axis ◽  
Vostok Station ◽  
Kunlun Station

Abstract This article presents the main aspects of the design solutions (based on the application of sensors MEMS and cantilevers), testing and applying of the multi-functional borehole logger ANTTIC (Antarctic Thermo-barometer, Inclinometer, Caliper) for geophysical high-precision monitoring (when simultaneous registering of temperature, pressure, axis inclination angle and radii of borehole cross-sections at 12 points), which is designed specifically for ultra-low temperatures and ultra-high pressures, and to determine an elliptical borehole shape and registration anisotropy factor in deep ice boreholes in the central region of Eastern Antarctica, in the areas of dome A at the Kunlun station (China) and/or of lake Vostok at the Vostok station (Russia).

scholarly journals The flow in metals under large constant stresses

1914 ◽  
Vol 90 (619) ◽  
pp. 329-342 ◽  
Keyword(s):  
High Temperature ◽  
Viscous Flow ◽  
Low Temperatures ◽  
Effect Of Temperature ◽  
Initial Part ◽  
Time Curve ◽  
Permanent Set ◽  
Pure Metals ◽  
Metallic Wires

§1. The object of this research was to examine the general laws of flow in metallic wires when extended in the region of large permanent set by stresses kept constant throughout the flow. Previously I have investigated in detail the flow for one metal, lead, and put forward some empirical laws; it was desired to see if these laws could be extended to other metals, and especially to investigate the effect of temperature on the nature of the flow. For lead, rise of temperature causes a very rapid increase in the rate of the viscous part of the flow ( loc. cit. ); hence it seemed likely that at very low temperatures the viscous part of the flow would case altogether, although large permanent extensions might be obtainable, and thus lead might behave in this respect as iron behaves at atmospheric temperatures. Similarly iron at a high temperature might behave like lead at atmospheric temperatures. It was also desired to see if very pure metals behaved in the same way as commercial metals, for it has been supposed that the nonviscous character of the initial part of the extension-time curve is due to impurities. Further, the properties of the viscous flow itself were to be investigated in greater detail. Investigation on these points are described in this paper; a summary of the results will be found in §10. Incidentally, in the case of alloys, a type of flow not hitherto observed has been found.

Thermal Conductivities of Pure Metals at Low Temperatures: Mercury

1957 ◽  
Vol 106 (5) ◽  
pp. 927-933 ◽  
Author(s):  
R. T. Webber ◽  
D. A. Spohr
Keyword(s):  
Low Temperatures ◽  
Pure Metals ◽  
Thermal Conductivities

Resistivity of pure metals at low temperatures. I. The alkali metals

1950 ◽  
Vol 202 (1068) ◽  
pp. 103-126 ◽  
Keyword(s):  
Temperature Interval ◽  
Temperature Region ◽  
Low Temperatures ◽  
Alkali Metals ◽  
The Other ◽  
Residual Resistance ◽  
Conduction Electrons ◽  
Pure Metals

A technique is described for measuring resistance in the temperature interval between 1.5 and 20° K continuously. The resistivity of the alkali metals has been determined in this temperature region, and the results have been discussed in comparison with theory. The resistivity of sodium has been found to agree closely with theory, while in the case of the other metals the hypothesis of quasi-free conduction electrons does not seem to be fully justified. Certain observations suggest that small impurities may give rise to anomalies other than the phenomenon of ‘residual’ resistance.

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