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10 microsecond time resolution studies of Cygnus X-1
Time variability analyses have been applied to data composed of event times of X-rays emitted from the binary system Cygnus X-1 to search for unique black hole signatures. The X-ray data analyzed was collected at ten microsecond time resolution or better from two instruments, the High Energy Astrophysical Observatory (HEAO) A-1 detector and the Rossi X-ray Timing Explorer (XTE) Proportional Counter Array (PCA). HEAO A-1 and RXTE/PCA collected data from 1977--79 and from 1996 on with energy sensitivity from 1--25 keV and 2--60 keV, respectively. Variability characteristics predicted by various models of an accretion disk around a black hole have been searched for in the data. Drop-offs or quasi-periodic oscillations (QPOs) in the Fourier power spectra are expected from some of these models. The Fourier spectral technique was applied to the HEAO A-1 and RXTE/PCA data with careful consideration given for correcting the Poisson noise floor for instrumental effects. Evidence for a drop-off may be interpreted from the faster fall off in variability at frequencies greater than the observed breaks. Both breaks occur within the range of Keplerian frequencies associated with the inner edge radii of advection-dominated accretion disks predicted for Cyg X-1. The break between 10--20 Hz is also …
Date:
June 1, 1997
Creator:
Wen, H.C.
System:
The UNT Digital Library
An Adaptive Finite Difference Method for Hyperbolic Systems in OneSpace Dimension
Many problems of physical interest have solutions which are generally quite smooth in a large portion of the region of interest, but have local phenomena such as shocks, discontinuities or large gradients which require much more accurate approximations or finer grids for reasonable accuracy. Examples are atmospheric fronts, ocean currents, and geological discontinuities. In this thesis we develop and partially analyze an adaptive finite difference mesh refinement algorithm for the initial boundary value problem for hyperbolic systems in one space dimension. The method uses clusters of uniform grids which can ''move'' along with pulses or steep gradients appearing in the calculation, and which are superimposed over a uniform coarse grid. Such refinements are created, destroyed, merged, separated, recursively nested or moved based on estimates of the local truncation error. We use a four-way linked tree and sequentially allocated deques (double-ended queues) to perform these operations efficiently. The local truncation error in the interior of the region is estimated using a three-step Richardson extrapolation procedure, which can also be considered a deferred correction method. At the boundaries we employ differences to estimate the error. Our algorithm was implemented using a portable, extensible Fortran preprocessor, to which we added records and pointers. …
Date:
June 1, 1982
Creator:
Bolstad, John H.
System:
The UNT Digital Library
Additive Functions
The purpose of this paper is the analysis of functions of real numbers which have a special additive property, namely, f(x+y) = f(x)+f(y).
Date:
June 1963
Creator:
McNeir, Ridge W.
System:
The UNT Digital Library
Adequacy of Training of Junior High School Teachers of Industrial Arts in Texas
"The problem of this study is to determine to what extent the junior high school teachers of industrial arts in Texas are being trained to meet the apparent needs and trends in the field. Do the teachers colleges of Texas have the facilities --curricula--to adequately train industrial arts teacher for the courses that are actually being taught in the junior high schools of Texas? The study is limited to certain aspects of industrial arts in the junior high schools and the State Teachers colleges of Texas. The offerings and trends in offerings of the junior high schools, the organization and trends in the organization, the adequacy of training of industrial arts teachers in the junior schools, and offerings and trends in the industrial arts departments of the Texas State Teachers Colleges are of major importance in this study. " --p. 1
Date:
June 1938
Creator:
Karnes, Ray
System:
The UNT Digital Library
Adjusting the Commercial Curriculum of Denton Senior High School, Denton, Texas, to the Needs of the Community
This study was made: first, to determine the vocational opportunities for commercial graduates of Denton Senior High School as a basis for more effective guidance; second, to determine whether the commercial training program in the local high school is providing adequate vocational preparation for the principal commercial positions in Denton, Texas, third, to discover the chief commercial weaknesses of the present employees in Denton, Texas; fourth, to secure information necessary for appropriate commercial curriculum for the local high school. It is the further aim of this investigation to determine the social as well as the personal business needs of the average individuals." --leaf 1
Date:
June 1939
Creator:
Hodge, James
System:
The UNT Digital Library
Advances and applications of dynamic-angle spinning nuclear magnetic resonance
This dissertation describes nuclear magnetic resonance experiments and theory which have been developed to study quadrupolar nuclei (those nuclei with spin greater than one-half) in the solid state. Primarily, the technique of dynamic-angle spinning (DAS) is extensively reviewed and expanded upon in this thesis. Specifically, the improvement in both the resolution (two-dimensional pure-absorptive phase methods and DAS angle choice) and sensitivity (pulse-sequence development), along with effective spinning speed enhancement (again through choice of DAS conditions or alternative multiple pulse schemes) of dynamic-angle spinning experiment was realized with both theory and experimental examples. The application of DAS to new types of nuclei (specifically the {sup 87}Rb and {sup 85}Rb nuclear spins) and materials (specifically amorphous solids) has also greatly expanded the possibilities of the use of DAS to study a larger range of materials. This dissertation is meant to demonstrate both recent advances and applications of the DAS technique, and by no means represents a comprehensive study of any particular chemical problem.
Date:
June 1, 1993
Creator:
Baltisberger, J. H.
System:
The UNT Digital Library
Americium and plutonium in water, biota, and sediment from the central Oregon coast
Plutonium-239, 240 and americium-241 were measured in the mussel Mytilus californianus from the region of Coos Bay, OR. The flesh of this species has a plutonium concentration of about 90 fCi/kg, and an Am-241/Pu-239, 240 ratio that is high relative to mixed fallout, ranging between two and three. Transuranic concentrations in sediment, unfiltered water, and filterable particulates were also measured; none of these materials has an Am/Pu ratio as greatly elevated as the mussels, and there is no apparent difference in the Am/Pu ratio of terrestrial runoff and coastal water. Sediment core profiles do not allow accumulation rates or depositional histories to be identified, but it does not appear that material characterized by a high Am/Pu ratio has ever been introduced to this estuary. Other bivalves (Tresus capax and Macoma nasuta) and a polychaete (Abarenicola sp.) do not have an elevated Am/Pu ratio, although the absolute activity of plutonium in the infaunal bivalves is roughly four times that in the mussels.
Date:
June 1, 1982
Creator:
Nielsen, R. D.
System:
The UNT Digital Library
Analysis and Computer Programming of Duncan's New Multiple Range Test
The primary purpose of this paper is to analyze and evaluate a relatively recently proposed statistic, "Duncan's New Multiple Range Test," for use when the researcher's plans call for a test of significance between three or more group means.
Date:
June 1965
Creator:
Wheeler, Walter
System:
The UNT Digital Library
Analysis and Evaluation of the Role of Elementary School Supervisors in Selected Texas Public Schools
In the analysis and evaluation of the role of the elementary school supervisor, the purpose was (1) to investigate relationships which might exist between certain personal and professional background characteristics of elementary school supervisors and the activities in which they engaged, (2) to determine the activities in which elementary school supervisors engaged, (3) to determine emphasis placed upon those activities in which elementary school supervisors engaged, and (4) to evaluate those activities in which elementary school supervisors engaged.
Date:
June 1963
Creator:
Todd, Cyrus Edwin, 1911-
System:
The UNT Digital Library
An Analysis of a Sample of County Welfare Families with a Record of Pregnancy Causing Increases in Welfare Expenditures
This is a study of families that had pregnancies while they were recipients or potential recipients of public assistance.
Date:
June 1966
Creator:
Hollingsworth, Bruce Richard
System:
The UNT Digital Library
An Analysis of Certain Factors Associated with Financing Capital Outlay for Texas Public Schools
The problem of this study is to determine the desirable characteristics of a sound program for financing Texas public school buildings--commensurate with need and with an equitable relation between state and local effort.
Date:
June 1956
Creator:
Herndon, Allen James
System:
The UNT Digital Library
An Analysis of Criteria for Orientation in Public Junior Colleges as Perceived by Three Groups
The problem of this study was to analyze the perceptions held by the following three groups concerning orientation criteria for public junior colleges: (1) a random sample of authorities in the field of orientation, (2) a random sample of public junior college presidents, and (3) a random sample of orientation directors of public junior colleges.
Date:
June 1970
Creator:
Kerbel, Larry Dean
System:
The UNT Digital Library
Analysis of Gd5(Si2Ge2) Microstructure and Phase Transition
With the recent discovery of the giant magnetocaloric effect and the beginning of extensive research on the properties of Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, a necessity has developed for a better understanding of the microstructure and crystal structure of this family of rare earth compounds with startling phenomenological properties. The aim of this research is to characterize the microstructure of the Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, with X {approx_equal} 2 and its phase change by using both transmission and electron microscopes. A brief history of past work on Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} is necessary to understand this research in its proper context.
Date:
June 27, 2002
Creator:
Meyers, John Scott
System:
The UNT Digital Library
An Analysis of Johann Nepomuk Hummel's Concerto for Trumpet
During the first half of the twentieth century the trumpet has gained its position as a solo instrument, even surpassing its esteemed position in the High Baroque Era. With the combined efforts of performers like Herbert L. Clark, Ernest S. Williams, and Joseph Arban, and the efforts of the French school of trumpet playing, notably those of Raymond Sabarich, the trumpet has risen from a mere accompanying instrument of the Classical Period and early Romantic Era to its present place as an expressive solo instrument. In this relatively new position the trumpeter is faced with one serious problem: that is one of limited literature. The trumpeter of today is almost compelled to perform either works of the Baroque Era or solos written within the last thirty years.
Date:
June 1970
Creator:
Hopper, Barry R. (Barry Robert)
System:
The UNT Digital Library
An Analysis of Junior Executive Training Programs in Department Stores in Texas
The problem was to determine the significance of various relationships between job-performance ratings and selected factors associated with the college curricula of junior executive trainees. Job-performance ratings were made by personnel directors and immediate supervisors of college graduates enrolled as participants in junior executive training programs in department stores in Texas.
Date:
June 1960
Creator:
Ermert, Gene Oliver
System:
The UNT Digital Library
An Analysis of Selected Characteristics of Persons Twenty-Five and Older Seeking Teacher Certification
The purposes of this study were (1) to describe the persons twenty-five and older entering the teacher education program and seeking certification, and (2) to compare the persons twenty-five and older with a "typical" group of persons under twenty-five with respect to (a) ability, as measured by the Cooperative School and College Ability Test, (b) factors for entering teaching, as measured by "Factors Influencing the Decision to Become a Teacher," (c) attitudes held toward teaching, as measured by the Kerlinger Education Attitude Scale, (d) professional aspirations, and (e) role expectations, as measured by the Teacher Practices. Questionnaire.
Date:
June 1970
Creator:
Brooks, Robert Lee
System:
The UNT Digital Library
An Analysis of Senior High School Government Courses in the Public Schools of Texas
To provide a better understanding of civil government as taught in the public senior high schools of Texas, this study investigates the scope of subject matter now included in the course, the method of presentation of the students, and suggests possible improvement toward solution.
Date:
June 1962
Creator:
Holman, Dorothy Jane Riggs
System:
The UNT Digital Library
An Analysis of the Adequacy of the Health Program in Certain Texas High Schools
This thesis examines the state of Texas high school health programs using federal standards first established seven years previously.
Date:
June 1939
Creator:
Heizer, Richmond P.
System:
The UNT Digital Library
An Analysis of the Advertising Art in Eight Retail Stores of Fort Worth Texas
It is the purpose of this thesis to acquaint the reader with the various systems, materials, and people who produce the art , in order to evaluate it and to pass on the results of its research to others who may find it useful in acquainting themselves with the advertising field.
Date:
June 1951
Creator:
Bradford, Johnny Paul
System:
The UNT Digital Library
An Analysis of the Correspondence-improvement Program at Great American Reserve Insurance Company Dallas, Texas
A preliminary purpose of this study in the area of business communications was that of determining the status of correspondence improvement in stock life insurance companies in Dallas. However, the major purpose, which stemmed from the preliminary one, was to study intensively the approach used in Great American.
Date:
June 1954
Creator:
Brock, Luther A.
System:
The UNT Digital Library
An Analysis of the Course of Study for Instrumental Music Courses in the High Schools of Texas
The purpose of this survey was to analyze the course of study in instrumental music prescribed by the Texas State Department for the high schools of the state and to determine whether or not a coordinated and well-rounded program of education in instrumental music is being offered in the schools of Texas. It was hoped, furthermore, that, by comparing this program with others elsewhere, this analysis might show whether or not Texas is following any general trend in instrumental music education.
Date:
June 1941
Creator:
Howard, William Harmon
System:
The UNT Digital Library
An Analysis of the Industrial Arts Program of the Fort Worth Public Schools, Fort Worth, Texas
This study is an analysis of the industrial arts program of the Fort Worth Public Schools, Fort Worth, Texas.
Date:
June 1955
Creator:
Pickett, A. D.
System:
The UNT Digital Library
An Analysis of the Problem of the Insecurity of Children
This study is an attempt to find causes and indications of insecurity in elementary school children. Possible solutions and ways to increase security are also explored.
Date:
June 1939
Creator:
Little, Edith
System:
The UNT Digital Library
An Analysis of Thirty Border Standard Metropolitan Statistical Areas in Relation to E. W. Burgess' Concentric Zone Hypothesis
This study is made to evaluate some of these forces for the thirty titled Standard Metropolitan Statistical Areas of the United States which are located on and overlap borders of two or more states. The attempt is made to determine if border SMSAs conform to the Burgess model despite state lines and other barriers imposed between SMSA parts, or whether such barriers restrict functional growth to the state side containing the central city.
Date:
June 1970
Creator:
Bonner, Austin
System:
The UNT Digital Library