Thesis (Ph. D.)--University of Wisconsin--Madison, 1975. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 203-210).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1931. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf [39]).

Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Chicago, 1921. / "Reprinted from the Physical review, n.s., vol. XIX., no. 2, February, 1922." Also available on the Internet.

Thesis (Ph. D.)--University of Chicago, Dept. of Chemistry, March 2001. / Includes bibliographical references. Also available on the Internet.

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From Introduction: Precipitation of energetic particl es into the upper atmosphere is known to cause aurora at high latitudes. Sanae is situated in the vicinity of the South Atlantic Geomagnetic Anomaly (Gledhill and Van Rooyen (1963)) where the magnetic field intensity is very low and it is felt that this phenomenon may enhance the loss of particles from the trapping zone into the upper atmosphere. Previous work at Rhodes has shown that it is extremely likely that particle precipitation could be the cause of some ionospheric effects at Sanae. Gledhill and Torr (1966) found that a "disturbed" ionosphere at Sanae was linked with "high" fluxes of precipitated electrons in the area conjugate to Sanae. Later papers by Gledhill, Torr and Torr (1967), and Torr and Torr (1967a, 1968a) established that electrons are precipitated over a large part of the earth's surface and this phenomenon is probably responsible for an average of about 30% of F-layer disturbances. The frequency of precipitation and corresponding disturbances is most pronounced in the South Atlantic Geomagnetic Anomaly . / KMBT_363 / Adobe Acrobat 9.54 Paper Capture Plug-in

The drift velocity of electrons in n-type germanium has been measured as a function of applied electric field at lattice temperatures of 77°K and 295°K. Three directions of applied field were used, viz. (1, 0, 0), (1, 1, 0) and (1, 1, 1) crystal directions. The range of field strength was from 100 v/cm to 75 kv/cm. A longitudinal anisotropy was observed at 77°K but not at 295°K. At 77°K the drift velocity for a given field strength was greatest in the (1, 0, 0) direction and least in the (1, 1, 1) direction. All specimens showed saturation of the drift velocity at high fields. In no case did the drift velocity show a further increase with increasing electric field once it had saturated. At 77°K, all (1, 0, 0) specimens exhibited a breakdown effect, the cause of which is not known. Its characteristics could not be correlated with any properties of the specimens. The results are analysed on the basis of an extension of Stratton's theory to the case of a many-valley semiconductor. It is assumed that intervalley scattering does not affect energy relaxation, but does contribute a shift in the relative populations of the conduction band valleys. This theory is successful at low fields. It predicts an anisotropy at 77°K while predicting none at 295°K. However, it predicts too much anisotropy at low fields at 77°K. It also predicts an anisotropy at high fields at 295°K. Suggestions are made as to possible reasons for these discrepancies. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

[No abstract available] / Science, Faculty of / Physics and Astronomy, Department of / Graduate