Results 261 to 270 of about 256,088 (302)

Measurements of the natural β-activity and the atmospheric polar conductivity in the atmospheric surface layer

Atmospheric Environment (1967), 1975
Abstract Like the natural radioactivity, the polar conductivity of the air shows a pronounced diurnal variation: the records show a sharp peak in the early morning and a very flat minimum in the afternoon. The diurnal variation is most pronounced from late spring to early autumn, i.e.
S. Israelsson, E. Knudsen, E. Ungethüm
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Measurements of atmospheric electrical conductivity near the ground

Journal of Atmospheric and Terrestrial Physics, 1966
Abstract Measurements of the positive and negative ionic conductivities close to the ground show that, at Durham, both conductivities decrease with height above the ground, in contrast to results of Hogg (1939) at Kew. The ratio of positive to negative conductivity and the alterations with height all decrease with increasing wind-speed.
K.A. Higazi, J.Alan Chalmers
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Variation of Conductivity of the Upper Atmosphere

Nature, 1929
MEASUREMENTS of the height of the base of the aurora in northern Norway by C. Stormer (Geofys. Publ., I., No. 5) and by L. Vegard and O. Krogness (Geofys. Publ., I., No. 1) show that a considerable number of the bases are situated at heights of about 100 km. and about 106 km. (compare the frequency curve, Fig. 18, Geofys. Publ., I., No. 1, p. 101).
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The control of the electrical conductivity of the lower atmosphere

Archiv für Meteorologie, Geophysik und Bioklimatologie Serie A, 1950
The electrical conductivity of the atmosphere at any part of the earth's surface depends on the local concentration of small ions. This in turn depends 1. on their rate of production and 2. on their rate of removal. The removal is due principally to attachment to condensation nuclei.
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Errors in the gerdien measurement of atmospheric electric conductivity

Meteorology and Atmospheric Physics, 1991
The measurement of conductivity has been an essential part of most atmospheric electricity research programs during the past century. This measurement is known to be vulnerable to a variety of potentially significant errors which can be separated into those resulting from diffusion of ions and those produced by electrical forces.
R. V. Anderson, J. C. Bailey, H. Tammet
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The electrical conductivity of the atmosphere over the Pacific Ocean

Eos, Transactions American Geophysical Union, 1953
The electrical conductivity of the atmosphere was measured over the Pacific Ocean. The measurements were made at altitudes of 3.8, 5.2 and 6 4 km and between geomagnetic latitudes of 22 and 45°N. The value of q computed from the measured conductivity values agrees very well with those derived from cosmic‐ray data.
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THE VARIATION OF THE ELECTRICAL CONDUCTIVITY OF THE ATMOSPHERE WITH HEIGHT

Canadian Journal of Research, 1938
The conductivity of the atmosphere has been measured during flights in aeroplanes near ground level and up to about 16,000 ft. Seven flights were made during the autumn and winter of 1936–1937. The Gerdien type of conductivity apparatus was used. An attempt was also made to measure potential gradients by the radioactive collector method.
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The effect of aerosols on the electrical conductivity in the atmosphere

Geofisica pura e applicata, 1961
The value of the electrical conductivity of the free atmosphere is inversely related to the concentration of nuclei. Measurements made with an airborne conductivity meter illustrates this effect. It was found that for these particular meteorological conditions a change of 47 nuclei/cm3 could be detected. It was also found that in one case nuclei from a
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Influence of atmospheric pollutants on the conductance of phthalocyanine films

Sensors and Actuators B: Chemical, 1999
Abstract Molecular oxygen has always been considered as the main gaseous agent responsible for the doping of intrinsically insulating phthalocyanine thin films. In this paper, it is shown that oxygen has only a relatively minor effect on electrical conductance and that traces (
A. de Haan, M. Debliquy, A. Decroly
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Influence of Atmospheric Annealing on the Conductivity of Mn-Doped PZT Ceramics

Key Engineering Materials, 2010
Conductivity measurements were carried out on Mn-doped PZT ceramics in order to investigate the changes in defect chemistry with annealing, by identifying the charge carriers such as lead or oxygen vacancies. PZT compositions were prepared by sol-gel method in rhombohedral region Pb(Zr0.56 Ti0.44)O3 with Mn contents 0.4, 0.8, 1.5 and 2 wt.%. Nano-sized
Shuaib, M., Hall, D. A.
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