Thesis--Catholic University of America. / Bibliography: p. 33.

Thesis (Ph. D.)--University of Illinois, 1913. / Biographical. "Published as two separate papers in the J. Am. Chem. Soc., 35, 737 and 750 (1913)": pt. I. A precision viscosimeter for the measurement of relative viscosity, and the relative viscosities of water at 0⁰, 18⁰, 25⁰ and 50⁰.--pt. II. The viscosities and conductivities of aqueous solutions of raffinose.

Thesis (Ph. D.)--University of California, 1914. / Cover title. "Reprinted from the Journal of the American chemical society, vol. XXXVI, no. 7, July, 1914." Thesis t.p. mounted on cover of the reprint. Caption title: The color and ionization of crystal-violet, by Elliot Q. Adams and Ludwig Rosenstein.

Thesis (Ph. D.)--Columbia University, 1923. / Vita.

Thesis (Ph. D.)--University of Chicago, 1917. / "Work in collaboration with Professor R.A. Millikan and Mr. M.J. Kelly." "Private edition, distributed by the University of Chicago libraries, Chicago, Illinois." "Reprinted from Physical review, n.s., volume xv, no. 3, March, 1920."

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

This thesis describes a study of gas discharges employing analogue computing techniques. Two discharges are examined: The extensively documented Townsend discharge and the recently investigated linear z-pinch discharge of plasma physics. The Townsend discharge theory is presented, with theoretical and experimental results given for the gas ionization coefficients ∝, ɤ and the attachment coefficient ƞ. Simulation of the general Townsend equation including ∝, ɤ and ƞ is described and an error analysis is given. Computer ionization curves are generated from experimental values of ∝, ɤ and ƞ in three common gases and compared with corresponding experimental ionization curves. Townsend’s empirical equation for ∝is used to extend ionization curves to relatively large values of E/p. Theoretical formulae are presented for the primary ionization coefficient in neon-argon gas mixtures. The z-pinch discharge in the case of infinite plasma conductivity is discussed and the snowplow equation for the time variation of the plasma tube radius is derived. An analogue simulator for the snowplow equation is presented and an error analysis given. Analogue computer radial collapse curves are generated for argon and nitrogen and comparisons are made between analogue, digital computer and experimental collapse curves. It is concluded that the analogue computer is well suited to the solution of problems involving the Townsend and z-pinch discharges. The possibility of treating magnetohydrodynamic power generation by analogue methods is mentioned. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

A low pressure coaxial flash tube of simple design has been constructed which does not suffer from deposition on the exit window. Some of the electrical and spectroscopic characteristics of the tube have been measured. A method of measuring the brightness temperature over the visible range was used by comparing photoelectrically the intensity of the tube with that of a black body. The temperature was found to be lower than expected. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Employing variational procedures on the transport equation we calculate, in this thesis, three relaxation times of a typical shock tube plasma. They are the electron-electron, ion-ion, and electron-ion relaxational times. The results are compared to those obtained by other authors, and are essentially an improvement on the work done by Phillips. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

In radiotherapy, half value layer has been accepted as a practical specification of the quality of primary x-rays. For the degraded radiation in a scattering medium, however, it is neither an applicable nor an adequate specification of the quality. This thesis describes a practical method of investigating the radiation quality in an irradiated medium. The method is based essentially on differences in emission and on differences in absorption of different materials. Two ratios were measured: (a) the ratio of the ionization current in a copper-lined ionization chamber to the ionization current in a lucite-wall chamber, (b) the ratio of the ionization current in the copper-lined chamber to the ionization current in the same lucite-wall chamber with the latter shielded by a copper absorber. These ratios, which depend on the spectrum of the x-radiation to which the chambers are exposed, change differently with change in spectrum and, therefore, give two indices of quality. For calibration purposes, the above ratios were measured for primary x-rays generated at different kilovoltages and with different filters. To investigate the quality of radiation in a scattering medium, the same ratios were measured and were compared with the results obtained for primary spectra. Radiation quality at different depths in water exposed to different qualities of primary x-rays was investigated. The results are in qualitative agreement with those obtained by previous workers. / Science, Faculty of / Physics and Astronomy, Department of / Graduate