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Numerical solution of the Navier--Stokes equations at high Reynolds numbers

Description: A numerical method is presented which is designed to solve the Navier- Stokes equations for two-dimensional, incompressible flow. The method is intended for use on problems with high Reynolds numbers for which calculations via finite difference methods have been unattainable or unreliable. The proposed scheme is a hybrid utilizing a time-splitting finite difference method in areas away from the boundaries. In areas neighboring the boundaries, the equations of motion are solved by the newly proposed vortex method by Chorin. The major accomplishment of the new scheme is that it contains a simple way for merging the two methods at the interface of the two subdomains. The proposed algorithm is designed for use on the time-dependent equations but can be used on steady state problems as well. The method is tested on the popular, time-independent, square cavity problem, an example of a separated flow with closed streamlines. Numerical results are presented for a Reynolds number of 10$sup 3$. (auth)
Date: January 1, 1974
Creator: Shestakov, A.I.
Partner: UNT Libraries Government Documents Department

Community participation patterns of the residents of Krum, Texas and Denton, Texas

Description: Patterns of participation in formal organizations by residents of a rural non-farm community are compared with those of residents in an urban community. Multi-stage random sampling is utilized in Denton to select those interviewed. In Krum, each residence was numbered and a table of random numbers was used to select households.
Date: December 1974
Creator: Blue, Dorothy A.
Partner: UNT Libraries

Effects of nutrient media on growth and morphology of Azotobacter vinelandii

Description: The work described in this thesis was undertaken to study the reasons why Azotobacter vinelandii ATCC 12837 after incubation in Burk's nitrogen-free liquid will not form as many colonies when plated on Difco Tryptic Soy Agar as when planted on Burk's nitrogen-free agar.
Date: August 1974
Creator: Butsch, Robert W.
Partner: UNT Libraries

The internship function of equity stock theaters

Description: this investigation dealt with the problem student actors confront in making a transition from educational to professional theater due to inadequate or insufficient training. A mail survey was conducted with 110 Equity stock theaters to determine whether or not those theaters serve an internship function to offer additional training and assist the beginning actor in his transition period.
Date: August 1974
Creator: Jones, Jerry A.
Partner: UNT Libraries

Testing the significance in predictability between multiple sets of variables differing in number on job facet satisfactions and performance rating of supervisors and technicians in a large public utility company

Description: This study tests whether criteria variance in five job-facet satisfactions and performance rating explained by selected demographic and personality variables is significantly greater than by the selected demographic variables.
Date: May 1974
Creator: Milbourn, Eugene Frederick
Partner: UNT Libraries

A study of food product recalls and the development of guidelines for the construction of recall programs for small food processors

Description: This study was concerned with the capability of food processors to conduct a product recall, when necessary, with the least time and cost expenditures. An evaluation was made of the effectiveness of the procedures, policies, and organization by which food processors have conducted or would conduct a product recall. Based upon this assessment, a model product recall program was designed to enhance the ability of food processors to conduct product recalls more efficiently.
Date: August 1974
Creator: Harrison, Mary Carolyn
Partner: UNT Libraries

A competency-based program for preparing the future elementary teacher in health

Description: The problem under consideration in this study is a description of teacher preparation for elementary school health instruction. The dissertation is organized into six chapters, which are as follows: Introduction, Review of Related Literature, Procedures for Collection and Treatment of Data, Input from Texas Teachers, Competency-Based Health Education, and Summary and Recommendations.
Date: December 1974
Creator: Wilson, Betty Ann Gunstream
Partner: UNT Libraries

A prototypical pattern in Dreiser's fiction

Description: As both a guide to personal therapy and a key to the work with which Dreiser established his artistic identity, the recurring narrative pattern is important. Its examination (1) illuminates an obscure period in Dreiser's life, (2) reveals his personality priorities as he turns the kaleidoscope of introspection to observe the Cudlipp crisis from various angles, and (3) offers to the discerning reader a reliable clue to the developing system of aesthetics of one of America's greatest artists.
Date: December 1974
Creator: Wood, Bobbye Nelson
Partner: UNT Libraries

Intrinsic fluctuation effects and certain other aspects of superconducting weak links

Description: Thesis. Recent theoretical developments have led to evermore refined theories for the Josephson effects in a variety of superconducting weak link'' structures. One of the major refinements has been the inclusion of the effects of intrinsic thermal fluctuations upon Josephson-like behavior. Some other developments include the investigation of mechanisms for the origin of the Josephson effects in non-tunneling structures, and equivalent circuit representations. Experimental investigations were made which encompass both of these areas; with special emphaais placed upon fluctuation effects; in pariicular, the effect of fluctuations upon the driven dc Josephson effect has been studied in considerable detail. The weak links studied included niobium point contacts, tin whisker'' crystals, and tin thin film bridges, the latter fabricated via an optical photoresist technique. The experiments were conducted in a temperature regime which extended to within a few mK of T/sub c/, the regime in which fluctuation effects are enhanced (and thus tnore experimentally accessible). The data consisted of relatively high resolution (ln V) low noise 1- -V characteristics obtained with an apparatus which incorporated ( plus or minus 10 mu K) temperature control with wide-band rf transmission, in a highly shielded environment. Experiniental rf-induced step pi-ofiles (the driven ac Josephsorin effect) and zero voltage step profiles (the dc Josephson effect) were compared in detail with the relevant intrinsic fluctuation theories (due to Ambegaokar, Halperin, and Stephen) via a one parameter fit, using the respective no-fluctuation step amplitude as she (natural) fitting parameter. We were able to distinguish between external noise effects and intrinsic effects and effectively excluded external noise; thus we maintain a high degree of confidence that the effects reported are indeed intrinsic to the weak links themselves. The agreement between thcory arind experinient was found to be very good in both the driven and the dc effects over a ...
Date: January 1, 1974
Creator: Henkels, W.H.
Partner: UNT Libraries Government Documents Department