Numerical modeling and evaluation of lab-scale CO2-injection experiments based on electrical resistivity measurements

1978 ◽

Vol 36 (1) ◽

pp. 68-69

Author(s):

W. E. King

Keyword(s):

Electrical Resistivity ◽

Electron Microscope ◽

High Voltage ◽

Resistivity Measurements ◽

Voltage Electron ◽

High Voltage Electron Microscope ◽

High Voltage Electron ◽

Wide Range ◽

Helium Gas

A side-entry type, helium-temperature specimen stage that has the capability of in-situ electrical-resistivity measurements has been designed and developed for use in the AEI-EM7 1200-kV electron microscope at Argonne National Laboratory. The electrical-resistivity measurements complement the high-voltage electron microscope (HVEM) to yield a unique opportunity to investigate defect production in metals by electron irradiation over a wide range of defect concentrations.A flow cryostat that uses helium gas as a coolant is employed to attain and maintain any specified temperature between 10 and 300 K. The helium gas coolant eliminates the vibrations that arise from boiling liquid helium and the temperature instabilities due to alternating heat-transfer mechanisms in the two-phase temperature regime (4.215 K). Figure 1 shows a schematic view of the liquid/gaseous helium transfer system. A liquid-gas mixture can be used for fast cooldown. The cold tip of the transfer tube is inserted coincident with the tilt axis of the specimen stage, and the end of the coolant flow tube is positioned without contact within the heat exchanger of the copper specimen block (Fig. 2).

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Electrical Resistivity Measurements and Soundings on Glaciers: Introductory Remarks

Journal of Glaciology ◽

10.1017/s0022143000019870 ◽

1967 ◽

Vol 6 (47) ◽

pp. 599-606 ◽

Cited By ~ 29

Author(s):

Hans Röthlisberger

Keyword(s):

Electrical Resistivity ◽

Resistivity Measurements ◽

Resistivity Method

A brief description of the resistivity method is given, stressing the points which are of particular importance when working on glaciers. The literature is briefly reviewed.

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Characterization of microstructural changes in an Al-6.8wt.% Mg alloy by electrical resistivity measurements

Materials Science and Engineering A ◽

10.1016/j.msea.2008.04.001 ◽

2008 ◽

Vol 492 (1-2) ◽

pp. 460-467 ◽

Cited By ~ 43

Author(s):

Miljana Popović ◽

Endre Romhanji

Keyword(s):

Electrical Resistivity ◽

Mg Alloy ◽

Microstructural Changes ◽

Resistivity Measurements

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STUDY OF THE DEPENDENCE OF HIGH Tc ON VARIOUS SINTERING TEMPERATURES FOR Bi-Pb-Sr-Ca-Cu-O SUPERCONDUCTORS

Modern Physics Letters B ◽

10.1142/s0217984991001969 ◽

1991 ◽

Vol 05 (24n25) ◽

pp. 1635-1638

Author(s):

S.M. M.R. NAQVI ◽

A.A. QIDWAI ◽

S.M. ZIA-UL-HAQUE ◽

FIROZ AHMAD ◽

S.D.H. RIZVI ◽

...

Keyword(s):

Electrical Resistivity ◽

Liquid Nitrogen ◽

X Ray Diffraction ◽

High Tc ◽

X Ray ◽

Resistivity Measurements ◽

Zero Resistance

Bi1.7-Pb0.3-Sr2-Ca2-Cu3-Ox superconducting samples were prepared at 855°C, 862 C, 870 C, and 882 C sintering temperatures respectively. All samples were sintered for 120 hours. The samples were then quenched in liquid nitrogen. The electrical resistivity measurements showed that the samples sintered at 870° C had the best Tc. For these samples the Tc onset was around 120 K and the zero resistance was obtained at 108 K. X-ray diffraction studies showed that the samples were multiphased.

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