Thesis (Ph. D.)--University of California, 1911. / "Reprinted from the Physical review, vol. XXXIII, no. 3, September, 1911."

Thesis (Ph. D.)--University of Wisconsin--Madison, 1957. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 139).

Applying purely thermodynamic arguments it has been shown that temperature fluctuations in a sample can be represented by introducing appropriate 'series temperature generator’ or 'shunt heat current generator'. The temperature fluctuations lead to resistance fluctuations in the sample. These resistance fluctuations due to temperature fluctuations can be detected as voltage-fluctuations (temperature noise) by using a sensing direct current through the sample. Statistical-mechanical arguments are used to obtain theoretical expressions for spectral density of heat current fluctuations in a metallic conductor in terms of the macroscopic properties of the conductor. Since the electrons are carriers of heat and electric currents in a metal, heat and electric current fluctuations are correlated. Spectral density of cross-correlation between electric and heat current is derived. Statistical considerations are extended to the calculation of the steady state spectral density of heat current fluctuations between two black bodies in radiative contact. Temperature noise in a system in which there is only a partial correlation between temperatures at different points along the length at any time (isothermal System) is compared with a system in which there is a complete correlation between temperatures at all points along the length at any time (Single Temperature System). Experimental results indicate that for the metal filament used Nyquist theorem can be applied at the operating temperature. For frequencies close to the characteristic frequency of the system it is observed that there is an increase in noise temperature of the filament due to temperature noise. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

This thesis discusses the minimization of the electric field intensity on electric power transmission line conductors. Two separate cases are considered. One, transmission lines with one conductor per phase, and two, transmission lines with several conductors per phase. Non-circular conductors are considered for the case when only one conductor is used for each phase. Some contours subject to conformal mapping are investigated to determine if conductors of such shapes provide less variation in electric surface charge density than circular conductors. Also a perturbation method is developed which essentially consists in perturbing the boundary of a circular cylinder in such a manner that the electric surface charge density on the cylinder is uniform when it is placed parallel to line charges. Using this method it is found that a solution exists only in one particular case. In considering, several conductors per phase, that is, bundled conductors, the bundle configuration is changed from the symmetrical form normally used until the same maximum electric field intensity exists on all conductors of the same phase. Transmission lines with three and four conductor bundles are treated. The optimum configuration was determined by aid of the Alwac III-E digital computer and the results obtained are indicated. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

This thesis describes work carried out in an attempt to relate the physical properties, in particular, the restivity of certain electrical conductors to the secondary field generated by them in the presence of an alternating primary electromagnetic field. It also discusses, the feasability of determining these properties by the normal methods of electromagnetic prospecting, and relating them to the mineralogical properties of geological conductors. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

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Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1902. / G. E. Lyman determined to be George E. Lyman and E. J. Morris determined to be Edward J. Morris from "1874-1999 MSM-UMR Alumni Directory". The entire thesis text is included in file. Typescript. Illustrated by authors. Title from title screen of thesis/dissertation PDF file (viewed October 30, 2008)