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The North Texan, Volume 33, Number 2, Spring 1983
The North Texan includes articles and notes about North Texas State University students, faculty, and alumni activities.
Date:
Spring 1983
Creator:
North Texas State University
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Prohibition in Symbol Communication
Literature in semiotics lacks consideration of the elements in symbols that communicate specific concepts. Prohibition was the concept chosen for study. Potential prohibitors were represented by line configurations superimposed on background symbols. Seven prohibitors coupled with symbol backgrounds to form 49 experimental symbols were studied through a symbol inventory. Prohibitors constituted the independent variable, while dependent variables were verbal responses by 105 college students to the experimental symbols. Two hypotheses were tested: a) Prohibitors differ in effectiveness in communicating prohibition and b) Prohibitors differ in frequency of distortion of symbol meaning. Chi square analyses and comparisons of proportions showed diagonal lines most frequently elicited prohibition responses. A chi square analysis displayed no significant relationship between prohibitors in distortion of symbol meaning.
Date:
May 1983
Creator:
Kunsak, Nancy Elizabeth
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Double Binding Communication: Emotionally Disruptive Effects on College Students
This study investigated the emotionally disruptive effects of double binding communication, as compared with overtly punitive, and warm, accepting interactions. Forty-two college undergraduates scoring above the mean on the Neuroticism Subscale of Eysenck's Personality Questionaire were each directed to play the part of a small child in a spontaneous role-played family interaction. A pre-post mood test (Multiple Adjective Affect Check List), sensitive to changes in depression, hostility, and anxiety was administered. It was found that subjects in the double-bind and punitive conditions evidenced significant mood disturbance while subjects in the control group did not (all ps < .05). Implications for Double Bind Theory were discussed.
Date:
May 1983
Creator:
Loos, Victor Eugene
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Proton decay theory
Topics include minimal SU(5) predictions, gauge boson mediated proton decay, uncertainties in tau/sub p/, Higgs scalar effects, proton decay via Higgs scalars, supersymmetric SU(5), dimension 5 operators and proton decay, and Higgs scalars and proton decay. (WHK)
Date:
January 1, 1983
Creator:
Marciano, William J.
Object Type:
Article
System:
The UNT Digital Library
Theory of bulk gettering
A general theory describing bulk getter operation is presented. The theory includes the effects of getter surface reactions and getter bulk diffusion. Exact numerical solutions are presented for the particular cases of pumping and desorption. In addition, approximate analytical solutions are derived and used to illustrate the characteristics of the particular operational regimes. The theory is applied to the analysis of the pumping and desorption behavior of the Zr-Al alloy bulk getter. The predictions of the theory are in excellent agreement with the experimentally measured Zr-Al performance.
Date:
January 1, 1983
Creator:
Knize, R. J. & Cecchi, J. L.
Object Type:
Report
System:
The UNT Digital Library
Generalized pseudopotential theory of d-band metals
The generalized pseudopotential theory (GPT) of metals is reviewed with emphasis on recent developments. This theory, which attempts to rigorously extend to d-band metals the spirit of conventional simple-metal pseudopotential perturbation theory, has now been optimized and fully integrated with the Kohn-Sham local-density-functional formalism, allowing for systematic first-principles calculations. Recent work on the problems of cohesion, lattice dynamics, structural phase stability, pressure- and temperature-induced phase transitions, and melting is discussed.
Date:
January 1, 1983
Creator:
Moriarty, J.A.
Object Type:
Article
System:
The UNT Digital Library
Spin-polarised band theory at finite temperatures
Starting from a Spin-Density functional description of electrons in a potentially ferromagnetic metal and the notion of temporarily broken ergodicity, a method is derived for performing finite temperature spin-polarized band theory with random local moment orientations. Formally, it is based on the KKR-CPA theory for randomly distributed spin-polarized scattering centers on a regular lattice. It is shown how the theory can lead to finite moments above the transition temperature, T/sub c/, and a Curie-Weiss law. We discuss the results of self-consistent spin-polarized KKR-CPA calculations in the disordered local moment (DLM) state for Fe, Co, Ni, and Cr.
Date:
January 1, 1983
Creator:
Gyorffy, B. L.; Kollar, J.; Pindor, A. J.; Staunton, J.; Stocks, G. M. & Winter, H.
Object Type:
Article
System:
The UNT Digital Library
Does hydraulic-fracturing theory work in jointed rock masses
The hypocenter locations of micro-earthquakes (acoustic emissions) generated during fracturing typically are distributed three-dimensionally suggesting that fracturing stimulates a volumetric region, rather than the planar fracture theoretically expected. The hypocenter maps generated at six operating, or potential, HDR reservoirs in the US, Europe and Japan are examined in detail and the fracture dimensions are correlated with fracture injection volumes and formation permeability. Depsite the volumetric appearance of the maps we infer that the induced fractures are mainly planar and may propagate aseismically. The induced seismicity stems from nearby joints, which are not opened significantly by fracturing, but are caused to shear-slip because of local pore pressure.
Date:
January 1, 1983
Creator:
Murphy, H.D.; Keppler, H. & Dash, Z.V.
Object Type:
Article
System:
The UNT Digital Library
Predictive models based on sensitivity theory and their application to practical shielding problems
Two new calculational models based on the use of cross-section sensitivity coefficients have been devised for calculating radiation transport in relatively simple shields. The two models, one an exponential model and the other a power model, have been applied, together with the traditional linear model, to 1- and 2-m-thick concrete-slab problems in which the water content, reinforcing-steel content, or composition of the concrete was varied. Comparing the results obtained with the three models with those obtained from exact one-dimensional discrete-ordinates transport calculations indicates that the exponential model, named the BEST model (for basic exponential shielding trend), is a particularly promising predictive tool for shielding problems dominated by exponential attenuation. When applied to a deep-penetration sodium problem, the BEST model also yields better results than do calculations based on second-order sensitivity theory.
Date:
January 1, 1983
Creator:
Bhuiyan, S. I.; Roussin, R. W.; Lucius, J. L. & Bartine, D. E.
Object Type:
Article
System:
The UNT Digital Library
Theory and application of a three-dimensional code SHAPS to complex piping systems. [LMFBR]
This paper describes the theory and application of a three-dimensional computer code SHAPS to the complex piping systems. The code utilizes a two-dimensional implicit Eulerian method for the hydrodynamic analysis together with a three-dimensional elastic-plastic finite-element program for the structural calculation. A three-dimensional pipe element with eight degrees of freedom is employed to account for the hoop, flexural, axial, and the torsional mode of the piping system. In the SHAPS analysis the hydrodynamic equations are modified to include the global piping motion. Coupling between fluid and structure is achieved by enforcing the free-slip boundary conditions. Also, the response of the piping network generated by the seismic excitation can be included. A thermal transient capability is also provided in SHAPS. To illustrate the methodology, many sample problems dealing with the hydrodynamic, structural, and thermal analyses of reactor-piping systems are given. Validation of the SHAPS code with experimental data is also presented.
Date:
January 1, 1983
Creator:
Wang, C. Y.
Object Type:
Article
System:
The UNT Digital Library
Decentralized control of large transient in power systems: theory and application. Final report, January 1981-August 1983
Chapter 1 describes a continuation algorithm to construct decentralized state feedback gains which place the natural frequencies (natural modes of vibration or eigenvalues) of a linearized power system at desired locations. Chapter 2 and 3 address the problem of designing a decentralized dither control for linearly interconnected synchronous machines, each of which is nonlinear. In Chapter 2, the theory finds application to the nonlinear third order model of a single machine infinite bus system where the primary control is via an ac-dc converter. Similarly Chapter 3 considers a two machine system with individual machine converters acting as the primary control. Computer simulations of the control action given various system perturbations are found in both Chapters 2 and 3.
Date:
August 1, 1983
Creator:
DeCarlo, R.; Hawley, P. & Sebok, D.
Object Type:
Report
System:
The UNT Digital Library
A Gauge-Invariant Energy Variational Principle Application to Anisotropic Excitons in High Magnetic Fields
A new method is developed for treating atoms and molecules in a magnetic field in a gauge-invariant way using the Rayleigh-Ritz energy variational principle. The energy operator depends on the vector potential which must be chosen in some gauge. In order to adapt the trial wave function to the gauge of the vector potential, the trial wave function can be multiplied by a phase factor which depends on the spatial coordinates. When the energy expectation value is minimized with respect to the phase function, the equation for charge conservation for stationary states is obtained. This equation can be solved for the phase function, and the solution used in the energy expectation value to obtain a gauge-invariant energy. The method is applicable to all quantum mechanical systems for which the variational principle can be applied. It ensures satisfaction of the charge conservation condition, a gauge-invariant energy, and the best upper bound to the ground-state energy which can be obtained for the form of trial wave function chosen.
Date:
December 1983
Creator:
Kennedy, Paul K. (Paul Kevin)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
DIF3D nodal neutronics option for two- and three-dimensional diffusion theory calculations in hexagonal geometry. [LMFBR]
A nodal method is developed for the solution of the neutron-diffusion equation in two- and three-dimensional hexagonal geometries. The nodal scheme has been incorporated as an option in the finite-difference diffusion-theory code DIF3D, and is intended for use in the analysis of current LMFBR designs. The nodal equations are derived using higher-order polynomial approximations to the spatial dependence of the flux within the hexagonal-z node. The final equations, which are cast in the form of inhomogeneous response-matrix equations for each energy group, involved spatial moments of the node-interior flux distribution plus surface-averaged partial currents across the faces of the node. These equations are solved using a conventional fission-source iteration accelerated by coarse-mesh rebalance and asymptotic source extrapolation. This report describes the mathematical development and numerical solution of the nodal equations, as well as the use of the nodal option and details concerning its programming structure. This latter information is intended to supplement the information provided in the separate documentation of the DIF3D code.
Date:
March 1, 1983
Creator:
Lawrence, R. D.
Object Type:
Report
System:
The UNT Digital Library
Full- and Half-Range Theory of Indefinite Sturm-Liouville Problems
This report is concerned with eigenvalue problems of the form Au = lambda Tu, where A is a selfadjoint positive differential operator and T a selfadjoint indefinite multiplicative operator on a Hilbert space H. Three particular cases are discussed in detail. In the first case, A is positive definite and T is unitary; in the second case, A is positive definite and T is bounded, but T⁻¹ is unbounded; in the third case, A is positive, dim ker(A) = 1, and T is bounded, but T⁻¹is unbounded. Emphasis is on the full-range and half-range expansion properties of the eigenfunctions.
Date:
September 1983
Creator:
Kaper, Hans G.; Kwong, Man Kam; Lekkerkerker, C. G. & Zettl, A.
Object Type:
Report
System:
The UNT Digital Library
Nodal method for three-dimensional fast-reactor calculations in hexagonal geometry. [LMFBR]
A nodal method is developed for the solution of the multigroup neutron-diffusion equation in three-dimensional hexagonal-z geometry. The method employs an extension to hexagonal geometry of the transverse-integration procedure used extensively in the development of nodal schemes in Cartesian geometry. The partially-integrated fluxes in the three hex-plane directions are approximated by a polynomial tailored to the unique properties of the transverse-integrated equations in hexagonal geometry. The final equations, which are cast in the form of local inhomogeneous response matrix equations for each energy group, involve spatial moments of the node-interior flux distribution plus surface-averaged partial currents across the faces of the node.
Date:
January 1, 1983
Creator:
Lawrence, R. D.
Object Type:
Article
System:
The UNT Digital Library
Effective Lagrangian for supersymmetric QCD
I present a Lagrangian which describes the spontaneous breaking of chiral symmetries in strongly interacting supersymmetric Yang-Mills theory with matter fields. This Lagrangian predicts that supersymmetry is spontaneously broken if the matter fields have precisely zero mass.
Date:
February 1, 1983
Creator:
Peskin, M.E.
Object Type:
Article
System:
The UNT Digital Library
A Brief Reevaluation of the History of the Idea of Progress in Regard to Social Philosophy and Sociology
The thesis offers an exposition and tentative solution of two problems: a definition of the Idea of Progress, and classification of social philosophers and sociologists according to this definition. Twelve propositions, or assumptions, are used to define the Idea, and works of selected philosophers from Hesiod to Parsons are examined in the light of this definition. Historical examination reveals that the Idea's acceptance reaches a zenith in the early nineteenth century, after which it lost credibility, becoming virtually discarded by mid-twentieth century.
Date:
December 1983
Creator:
Kurtz, Steven J. (Steven John)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Toward a constructive physics
We argue that the discretization of physics which has occurred thanks to the advent of quantum mechanics has replaced the continuum standards of time, length and mass which brought physics to maturity by counting. The (arbitrary in the sense of conventional dimensional analysis) standards have been replaced by three dimensional constants: the limiting velocity c, the unit of action h, and either a reference mass (eg m/sub p/) or a coupling constant (eg G related to the mass scale by hc/(2..pi..Gm/sub p//sup 2/) approx. = 1.7 x 10/sup 38/). Once these physical and experimental reference standards are accepted, the conventional approach is to connect physics to mathematics by means of dimensionless ratios. But these standards now rest on counting rather than ratios, and allow us to think of a fourth dimensionless mathematical concept, which is counting integers. According to constructive mathematics, counting has to be understood before engaging in the practice of mathematics in order to avoid redundancy. In its strict form constructive mathematics allows no completed infinities, and must provide finite algorithms for the computation of any acceptable concept. This finite requirement in constructive mathematics is in keeping with the practice of physics when that practice is restricted to …
Date:
June 1, 1983
Creator:
Noyes, H. P.; Gefwert, C. & Manthey, M. J.
Object Type:
Article
System:
The UNT Digital Library
Problems at the interface between perturbative and nonperturbative quantum chromodynamics
Predictions based on perturbative QCD rest on three premises: (1) that hadronic interactions become weak in strength at small invariant separation; (2) that the perturbative expansion in ..cap alpha../sub s/(Q) is well-defined; and (3) factorization: all effects of collinear singularities, confinement, nonperturbative interactions, and bound state dynamics can be isolated at large momentum transfer in terms of structure functions, fragmentation functions, or in the case of exclusive processes, distribution amplitudes. The assumption that the perturbative expansion for hard scattering amplitudes converges has certainly not been demonstrated; in addition, there are serious ambiguities concerning the choice of renormalization scheme and scale choice Q/sup 2/ for the expansion in ..cap alpha../sub s/(Q/sup 2/). We will discuss a new procedure to at least partly rectify the latter problem. In the case of exclusive processes, the factorization of hadronic amplitudes at large momentum transfer in the form of distribution amplitudes convoluted with hard scattering quark-gluon subprocess amplitudes can be demonstrated systematically to all orders in ..cap alpha../sub s/(Q/sup 2/). In the case of inclusive reactions, factorization remains an ansatz; general all-orders proofs do not exist because of the complications of soft initial state interactions for hadron-induced processes; thus far factorization has only been verified …
Date:
June 1, 1983
Creator:
Brodsky, S. J.; Bodwin, G. T. & Lepage, G. P.
Object Type:
Article
System:
The UNT Digital Library
The DIF3D Nodal Neutronics Option for Two- and Three-dimensional Diffusion Theory Calculations in Hexagonal Geometry
A nodal method is developed for the solution of the neutron-diffusion equation in two- and three-dimensional hexagonal geometries. The nodal scheme has been incorporated as an option in the finite-difference diffusion-theory code DIF3D, and is intended for use in the analysis of current LMFBR designs. The nodal equations are derived using higher-order polynomial approximations to the spatial dependence of the flux within the hexagonal-z node. The final equations, which are cast in the form of inhomogeneous response-matrix equations for each energy group, involved spatial moments of the node-interior flux distribution plus surface-averaged partial currents across the faces of the node. These equations are solved using a conventional fission-source iteration accelerated by coarse-mesh rebalance and asymptotic source extrapolation. This report describes the mathematical development and numerical solution of the nodal equations, as well as the use of the nodal option and details concerning its programming structure. This latter information is intended to supplement the information provided in the separate documentation of the DIF3D code.
Date:
March 1983
Creator:
Lawrence, R. D.
Object Type:
Report
System:
The UNT Digital Library
Imagery of physics in psychology: a physicist's reactions
None
Date:
November 1, 1983
Creator:
Sanders, Gary H.
Object Type:
Article
System:
The UNT Digital Library
Grand unified theories
Topics discussed include coupling constants; minimal SU(5) predictions (sin/sup 2/theta/sub W/, m/sub W/ and m/sub Z/, proton decay, and magnetic monopoles); Higgs scalar effects including proton decay and flavor changing and oscillation phenomena; and supersymmetry. 31 references.
Date:
September 11, 1983
Creator:
Marciano, W. J.
Object Type:
Article
System:
The UNT Digital Library
Relationships of Sex-Role Identification, Self-Esteem and Attitudes Toward Women to Responses on a Scale of Sexist Humor
Theories and research in the field of disparaging humor were reviewed, and sexist humor was studied as representative of this field. The relationships of sex-role identification, self-esteem, and attitudes toward women to the judgement of humor in sexist material were investigated. The Scale of Sexist Humor, developed for this investigation, utilized a set of 50 cartoons and jokes devised to approximate overlapping standard curves on the dimensions of sexist content and humor. Subjects were 57 males and 70 female undergraduate students. Each subject performed a forced Q^-sort of the cartoons and jokes, thereby rating them on a five-point scale of funniness, then completed instruments designed to evaluate sex-role identification (the Personal Attributes Questionnaire), self-esteem (The Texas Social Behavior Inventory), and attitudes toward women (the Attitudes Toward Women Scale), A demographic information sheet was also obtained from each subject to utilize in ancillary analysis.
Date:
August 1983
Creator:
Gravley, Norma J. (Norma Jean)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Mathematical model of a utility firm. Final technical report, Part III
This project is aimed at understanding the economic and behavioral processes that take place within a utility firm, and without it. This volume covers dynamics of economic systems (Phase II of the project): economic equilibrium theory, discrete economics, exchange economics, production economics, approach to equilibrium.
Date:
August 21, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library