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Articles 1441 - 1450 of 1450

Full-Text Articles in Nuclear Engineering

A Theoretical Study Of The Mechanism For The Haeffner Effect, David Charles Jacobs Jan 1962

A Theoretical Study Of The Mechanism For The Haeffner Effect, David Charles Jacobs

Masters Theses

"In 1953, E. Haeffner reported that when he had passed a direct electric current through a length of capillary filled with liquid mercury, the lighter mercury isotopes were enriched at the positive terminal and the heavier mercury isotopes were enriched at the negative terminal. This phenomenon is referred to as the Haeffner Effect. Since Haeffner’s original experiment, other investigators have obtained similar results in other liquid metal systems.

When a direct electric current passes through a metallic conductor a free energy gradient is established. The direction of the negative free energy gradient is in the direction of the positive ...


The Removal Of Sub-Structure From Alpha Uranium, Albert E. Bolon Jan 1962

The Removal Of Sub-Structure From Alpha Uranium, Albert E. Bolon

Masters Theses

"The possibility of obtaining larger, perfect single crystals of alpha uranium by a modified strain-anneal method has been investigated. A -196°C tensile deformation was performed on pseudo single crystal rods which had been prepared by the phase transformation method. The specimens were subsequently annealed at 650°C.

It was found that by utilizing pseudo single crystals with a prescribed crystallographic orientation with respect to the tensile axis that recrystallized crystals of comparable size and perfection to those prepared by the grain coarsening method could be produced. Grain coarsening is the presently accepted process for preparing perfect single crystals of ...


A Systematic Study Of Experimental Parameters In A Cloud Chamber Search For Subionizers, Zin Aung Jan 1961

A Systematic Study Of Experimental Parameters In A Cloud Chamber Search For Subionizers, Zin Aung

Masters Theses

"Since there is no theoretical basis for the quantization of electric charge, it is reasonable to consider the possible existence of particles with charges much less than the electronic charge ‘e’. Such particles, if they exist, are expected to ionize more lightly than the electron. Similar remarks hold true for particles with electric dipole moments, and relativistic monopoles with strengths much less than ’e’ electrostatic units. These particles have been termed subionizers.

The selection of apparatus for a subionizer search has been discussed. The desired conditions for such a search using a low background, long sensitive time Wilson cloud chamber ...


A Study Of The Transient State Of Transpiration Cooling, William C. Wolkenhauer Jan 1961

A Study Of The Transient State Of Transpiration Cooling, William C. Wolkenhauer

Masters Theses

"This thesis is a successful attempt to show a new approach to the transpiration cooling problem. Transpiration cooling has long been known as an effective way of removing heat from porous material.

It is shown here that transpiration cooling from a porous material, assuming a temperature difference between the coolant and the porous material, is less effective than where the coolant within the pores is assumed to be at the same temperature as the material adjacent to the pore. Previous investigators made the latter assumption.

The specific problem considered here is that of a uniform, porous plate with constant physical ...


Semi-Annual Summary Research Report In Engineering For January–June 1959, Ames Laboratory Nov 1959

Semi-Annual Summary Research Report In Engineering For January–June 1959, Ames Laboratory

Ames Laboratory Technical Reports

This report is prepared from material submitted by group leaders of the Laboratory.


Linear And Vortex Flow Heat Transfer Coefficients, Edward Robert Schmidt Jr. Jan 1959

Linear And Vortex Flow Heat Transfer Coefficients, Edward Robert Schmidt Jr.

Masters Theses

"In order to make possible better, more efficient equipment, a higher and higher rate of heat transfer has been the goal of engineers for many years. The need for heat transfer rates never thought of 25 years ago has been brought about by the advent of modern high-performance devices such as nuclear reactors and rocket motors. "A heat release of about 40,000 Btu/hr.cu.ft. is considered good practice in a modern boiler, but in a rocket or a nuclear reactor it may be 1,000,000,000 Btu/hr.cu.ft." This heat must be removed by ...


A Study Of The Adsorption Of Radioactive Zirconium, Niobium, Cesium, And Barium On Alumina, Silica Gels And Clays, Dale Wesley Harris Jan 1959

A Study Of The Adsorption Of Radioactive Zirconium, Niobium, Cesium, And Barium On Alumina, Silica Gels And Clays, Dale Wesley Harris

Masters Theses

"The purpose of this investigation was: (1) search the literature and review various methods investigated for the safe storage of radioactive waste products, (2) study the possible methods for the recovery, of useful radioactive isotopes by selective adsorption, (3) perform laboratory tests to determine the capacity of various adsorbents for radioactive isotopes, (4) evaluate the data and correlate it with the findings reported in the literature, (5) make recommendations of the feasibility of using these adsorbents for removal or storage of the radioactive products, and (6) make recommendations for further investigations. The adsorption of radioactive zirconium, niobium, cesium and barium ...


A Transient Thermal Analog Of Nuclear Reactors, James R. Hume Aug 1958

A Transient Thermal Analog Of Nuclear Reactors, James R. Hume

Nuclear Engineering ETDs

The nuclear reactor is presently receiving considerable attention as a possible source of energy for stationary power plants and propulsion systems. This has stimulated interest in many engineering problems which become very significant in reactor design work. The response of the reactor core heat transfer system to changes in power generation is one of these problems.


Device For Detection And Identification Of Charged Particles From Photonuclear Reactions, Albert William Snyder, D. J. Zaffarano Dec 1953

Device For Detection And Identification Of Charged Particles From Photonuclear Reactions, Albert William Snyder, D. J. Zaffarano

Ames Laboratory ISC Technical Reports

A device is described which makes possible the determination of the energy spectrum of protons, alpha particles, or deuterons in the presence of other charged particles. Energy loss per unit path length (dE/dx) and total energy (E) are displayed in the form of voltage pulses of varying amplitudes in quadrature on an oscilloscope screen. The peaks of the pulses are intensitifed, resulting in hyperbolic loci for different types of particles. By masking the oscilloscope screen and using the moving film pulse height analysis technique developed in this laboratory, independent energy spectra may be obtained for each type of particle.


The Molten-Metal-Fuel Reactor, F. H. Spedding Jun 1953

The Molten-Metal-Fuel Reactor, F. H. Spedding

Ames Laboratory ISC Technical Reports

Scientists who were engaged in the atomic program before the end of 1943 had pretty well outlined most of the types of reactors which are being discussed today. These outlines were usually quite general and merely sketched the theoretical possibility of building a particular type of reactor. Many of these discussions were not recorded, and the records of others are hard to find today since they are buried in the Project literature and have not been properly indexed. However, a careful search of reports such as the minutes of the Project Council and the weekly and monthly reports of the ...