Results 251 to 260 of about 77,987 (293)

On the conductivity of the air in thunderstorms

Journal of Geophysical Research, 1964
Recently Freier [1962] attempted to use measurements of the recovery of the electric field after lightning flashes to deduce the conductivity within the cloud. He concluded that the value is of the order of 20 times that in clear air at the same level. Freier did not, however, take account of point-discharge currents below the cloud.
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Conductivity of the air in thunderstorms

Journal of Geophysical Research, 1962
Some further measurements have been made on relaxation times of air in thunderstorms. The results indicate that the conductivity in active regions of precipitation is 20 times greater than the value used in most calculations. The theory of the problem is considered in detail in order to point out how the increased conductivity of the air in ...
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Conductivity of Highly Dosed Air

IEEE Transactions on Nuclear Science, 1980
This paper reports on the measurement of the electrical conductivity of air after the air has absorbed a dose on the order of 2×106 rad. The experiment, employing the HERMES II facility of Sandia Laboratories and a Febetron x-ray source, showed no difference in the value of ?/?
J. G. Chervenak, V. A. J. van Lint
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Electrical conductivity of air in the troposphere

Journal of Geophysical Research, 1951
Extensive aircraft measurements of the electrical conductivity of the atmosphere in fair weather were carried out over widely separated areas in the United States between February and November, 1950. Instrumentation of the plane is briefly discussed. The positive and negative conductivities were found to be equal throughout the altitude range of 35,000
Rita C. Callahan, S. C. Coroniti, A. J. Parziale, R. Patten   +3 more
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A theoretical study of the conductivity of air in thunderstorms

Journal of Geophysical Research, 1963
By considering the boundary conditions at the surface of a thunderstorm cloud, it can be shown that most descriptions of the charge configuration found in these storms are compatible with relatively high electrical conductivity within the cell. The problem is formulated by having a vertical column of current carry positive charge upward and deposit ...
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Thermal Conductivity of Humid Air

International Journal of Thermophysics, 2012
In this article, measurements of the thermal conductivity of humid air as a function of pressure, temperature, and mole fraction of water, for pressures up to 5 MPa and temperatures up to 430 K, for different water contents (up to 10 % vapor mole fraction) are reported.
S.G.S. Beirão, A.P.C. Ribeiro, M.J.V. Lourenço, F.J.V. Santos, C.A. Nieto de Castro   +4 more
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The Thermal Conductivity of Fluid Air

Journal of Physical and Chemical Reference Data, 1985
Based on available experimental data, the thermal conductivity of fluid air has been critically evaluated. A new set of recommended values is presented covering a pressure range from 1 to 1000 bar and a temperature range from 70 to 1000 K. Using the concept of residual thermal conductivity the recommended values are described by a 13-parameter equation
K. Stephan, A. Laesecke
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Role of air in polyethylene conduction

Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1975, 1975
Conduction processes in polyethylene under high field depend upon the electrode-polymer interface and the ambient atmosphere. It was reported last year1 that the conduction of low density and high density polyethylene is sensitive to Shottky type emission from the cathode in air as well as in vacuum except in the presence of air between electrodes and ...
I.B. Jordan, T. Mizutani
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The output conductance in GaAs air-gap MESFETs

IEEE Transactions on Electron Devices, 1992
Summary form only given. Theoretical studies have led to the conclusion that substrate injection into the epilayer underneath the channel plays a major role in the output conductance of the GaAs MESFET. The authors believe that vacuum (or an air gap) itself would be the best layer to have underneath the channel.
N. Nguen, K. Kiziloglu, J. Ibbetson, L.W. Yin, M. Hashemi, U. Mishra   +5 more
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Cutile Air and Bone Conduction Thresholds of the Deaf

Exceptional Children, 1970
This article reports an exploration of whether low frequency air and bone thresholds elicited at high intensity levels from deaf children reflect valid auditory sensitivity or are mediated through cutaneous-tactile receptors. Twenty-one subjects comprised of 5 “priority deaf” subjects (totally deaf), 6 “control deaf” subjects (residual hearing) and 10 “
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