Latest content added for UNT Digital Library Collection: UNT Theses and Dissertationshttp://digital.library.unt.edu/explore/collections/UNTETD/browse/?fq=untl_institution:UNT&fq=str_degree_department:Department+of+Physics&fq=untl_decade:1950-19592013-06-04T22:29:06-05:00UNT LibrariesThis is a custom feed for browsing UNT Digital Library Collection: UNT Theses and DissertationsDesign and Testing of a Positive Ion Accelerator and Necessary Vacuum System2013-06-04T22:29:06-05:00http://digital.library.unt.edu/ark:/67531/metadc163830/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc163830/"><img alt="Design and Testing of a Positive Ion Accelerator and Necessary Vacuum System" title="Design and Testing of a Positive Ion Accelerator and Necessary Vacuum System" src="http://digital.library.unt.edu/ark:/67531/metadc163830/small/"/></a></p><p>This thesis is a study of the design and testing of a positive ion accelerator and necessary vacuum system.</p>A Determination of the Bothe Depression Factor for Discs in Water2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130255/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc130255/"><img alt="A Determination of the Bothe Depression Factor for Discs in Water" title="A Determination of the Bothe Depression Factor for Discs in Water" src="http://digital.library.unt.edu/ark:/67531/metadc130255/small/"/></a></p><p>The purpose of this work is to determine experimentally the depression of the neutron density by a detecting foil. The depression factor is known as the "self-shading" of the foil.</p>Analyzing Magnet System for the Electrostatic Accelerator2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130409/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc130409/"><img alt="Analyzing Magnet System for the Electrostatic Accelerator" title="Analyzing Magnet System for the Electrostatic Accelerator" src="http://digital.library.unt.edu/ark:/67531/metadc130409/small/"/></a></p><p>This thesis describes the design and construction of a linear accelerator, specifically, a positive-ion source, a high voltage supply, an accelerating column, and the necessary associated vacuum system.</p>Foil Depression Factors for Disc-shaped Detectors2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130367/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc130367/"><img alt="Foil Depression Factors for Disc-shaped Detectors" title="Foil Depression Factors for Disc-shaped Detectors" src="http://digital.library.unt.edu/ark:/67531/metadc130367/small/"/></a></p><p>The generalized data which are presented in this thesis are the culmination of the determination of the foil depression factor using oblate spheroidal coordinates.</p>Neutron Density Depression Due to an Oblate Spheroidal Detector2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130362/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc130362/"><img alt="Neutron Density Depression Due to an Oblate Spheroidal Detector" title="Neutron Density Depression Due to an Oblate Spheroidal Detector" src="http://digital.library.unt.edu/ark:/67531/metadc130362/small/"/></a></p><p>In this paper, two projects have been undertaken. First, Workman's calculations have been checked to a higher degree of approximation to determine the accuracy of his method. Second, a new set of boundary conditions has been developed for obtaining solutions of the neutron diffusion equation which do not depend on the solution of the equation inside the detector.</p>Operation and Control of a Radiofrequency Ion Source2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130340/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc130340/"><img alt="Operation and Control of a Radiofrequency Ion Source" title="Operation and Control of a Radiofrequency Ion Source" src="http://digital.library.unt.edu/ark:/67531/metadc130340/small/"/></a></p><p>This thesis examines the operation and control of a radiofrequency ion source.</p>A Method for Calculating Foil Depression Factors2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130315/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc130315/"><img alt="A Method for Calculating Foil Depression Factors" title="A Method for Calculating Foil Depression Factors" src="http://digital.library.unt.edu/ark:/67531/metadc130315/small/"/></a></p><p>As disc-shaped detectors are one of the primary means of measuring the neutron density, a better solution is desirable if the error due to the depression factor is to be made negligible. In this paper, an attempt is made to solve this problem in the oblate spheroidal co-ordinate system which most nearly describes the disc-shaped detector, so that solutions may be obtained that describe depression factors for detectors of varying thicknesses and radii.</p>Variational Wave Function for Sodium2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130344/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc130344/"><img alt="Variational Wave Function for Sodium" title="Variational Wave Function for Sodium" src="http://digital.library.unt.edu/ark:/67531/metadc130344/small/"/></a></p><p>The practical method of applying the variation principle to the calculation of the energy of an atom demands a trial function which contains variable parameters. The previous work done using this approach was based on the use of some combination of hydrogenic wave functions containing parameters inserted in appropriate places. The present calculation of the energy of the eleven-electron atom has been brought about using this method.</p>Quaternion Representation of Crystal Point Groups2012-10-12T10:26:10-05:00http://digital.library.unt.edu/ark:/67531/metadc108066/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc108066/"><img alt="Quaternion Representation of Crystal Point Groups" title="Quaternion Representation of Crystal Point Groups" src="http://digital.library.unt.edu/ark:/67531/metadc108066/small/"/></a></p><p>The physical behavior of crystalline solids is very closely related to the internal symmetry of the crystal structure. For this reason it is desirable to represent mathematically this symmetry in such a way that the actual physical problems can be handled as they arise. In the case of this thesis the research has been guided by a list of desired properties for such a representation. No claim is made that the list is complete.</p>Potential Distribution of an Electrical Source-Sink Combination Along the Axis of an Infinite Cylinder2012-10-12T10:26:10-05:00http://digital.library.unt.edu/ark:/67531/metadc107854/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc107854/"><img alt="Potential Distribution of an Electrical Source-Sink Combination Along the Axis of an Infinite Cylinder" title="Potential Distribution of an Electrical Source-Sink Combination Along the Axis of an Infinite Cylinder" src="http://digital.library.unt.edu/ark:/67531/metadc107854/small/"/></a></p><p>In the present paper, an attempt is made to obtain the potential distribution in the case of two such charges, a source-sink combination, located on the axis of a bore hole drilled through an infinite, homogeneous medium.</p>