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Note on Zeno's paradox in quantum theory
A decaying quantum system, if observed very frequently in order to ascertain whether or not it is still undecayed, will not decay at all. The derivation of this effect - known, e.g., as Zeno's paradox - has been criticized recently. It has been argued that measurements performed in a very short time interval, ..delta..t, produce states with a very large energy uncertanty, ..delta..E, and that Zeno's paradox disappears if this is taken into account. By construction of an explicit counterexample it is proved, however, that there is no energy-time uncertainty relation of the required kind; therefore, the criticism mentioned is unjustified.
Date:
February 1, 1980
Creator:
Kraus, K.
Object Type:
Report
System:
The UNT Digital Library
Dynamic Theory: a new view of space, time, and matter
The theory presented represents a different approach toward unification of the various branches of physics. The foundation of the theory rests upon generalizations of the classical laws of thermodynamics, particularly Caratheodory's abstract statement of the second law. These adopted laws are shown to produce, as special cases, current theories such as Einstein's General and Special Relativity, Maxwell's electromagnetism, classical thermodynamics, and quantum principles. In addition to this unification, the theory provides predictions that may be experimentally investigated. Some of the predictions are a limiting rate of mass conversion, reduced pressures in electromagnetically contained plasmas, increased viscous effects in shocked materials, a finite self-energy for a charged particle, and the possible creation of particles with velocities greater than the speed of light. 8 figures.
Date:
December 1, 1980
Creator:
Williams, P.E.
Object Type:
Report
System:
The UNT Digital Library
The Relationship of the Oral Communication Needs of Business and Industry to the Business and Professional Communication Courses in Texas Colleges and Universities
The purposes of this study were to examine the oral communication skills considered important to specific companies, identify the objectives emphasized in the business and professional communication courses in Texas colleges and universities, ascertain how much course time is spent in various areas, and determine the communication needs of business and industry and the degree to which the communication departments of Texas colleges and universities are meeting those needs.
Date:
August 1980
Creator:
McCallum, Karin Eriksson
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Fiber optic communication links
Fiber optics is a new, emerging technology which offers relief from many of the problems which limited past communications links. Its inherent noise immunity and high bandwidth open the door for new designs with greater capabilities. Being a new technology, certain problems can be encountered in specifying and installing a fiber optic link. A general fiber optic system is discussed with emphasis on the advantages and disadvantages. It is not intended to be technical in nature, but a general discussion. Finally, a general purpose prototype Sandia communications link is presented.
Date:
January 1, 1980
Creator:
Meyer, R. H.
Object Type:
Article
System:
The UNT Digital Library
The Relationships Among Self-Esteem, Marital Communication, and Marital Adjustment
This investigation seeks to determine the correlations among the three factors of self-esteem, marital communication and marital adjustment to determine if these factors are evidenced similarly in the marital system, and to determine if their relationships are consistent among a wide range of marriages. In addition, several demographic variables are isolated in order to determine their influence on the three factors under investigation. Based on the findings of the study, it was concluded that marital adjustment is dependent on married individuals' level of self-esteem and the ability to communicate effectively. It was also concluded that when there is a high level of either self-esteem, marital communiation, or marital adjustment, the other factors will also be at a high level. In addition, the consistency of the relationships among marital adjustment, marital communication, and self-esteem apparently transcend demographic factors.
Date:
February 1980
Creator:
Carter, Warren Leslie
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Generalized perturbation theory using two-dimensional, discrete ordinates transport theory
Perturbation theory for changes in linear and bilinear functionals of the forward and adjoint fluxes in a critical reactor has been implemented using two-dimensional discrete ordinates transport theory. The computer program DOT IV was modified to calculate the generalized functions GAMMA and GAMMA*. Demonstration calculations were performed for changes in a reaction-rate ratio and a reactivity worth caused by system perturbations. The perturbation theory predictions agreed with direct calculations to within about 2%. A method has been developed for calculating higher lambda eigenvalues and eigenfunctions using techniques similar to those developed for generalized functions. Demonstration calculations have been performed to obtain these eigenfunctions.
Date:
June 1, 1980
Creator:
Childs, R. L.
Object Type:
Report
System:
The UNT Digital Library
The Impact of Hearing Impairment upon Communication Apprehension and Self-Disclosure
The present study used a variety of procedures to investigate which selected communication factors interfered in the interpersonal communication process between hearing-impaired and hearing persons. Three hypotheses were tested and all of them were confirmed. The results of the analyses of responses to the variables revealed that hearing-impaired subjects had greater communication problems when interpersonally interacting with hearing targets than with deaf targets. The hearing subjects reported a higher level of state communication anxiety and an overall lower level of self-disclosure when interacting with deaf targets than with hearing targets.
Date:
December 1980
Creator:
Gonzalez, Teresa Dennett
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Theory of contributon transport
A general discussion of the physics of contributon transport is presented. To facilitate this discussion, a Boltzmann-like transport equation for contributons is obtained, and special contributon cross sections are defined. However, the main goal of this study is to identify contributon transport equations and investigate possible deterministic solution techniques. Four approaches to the deterministic solution of the contributon transport problem are investigated. These approaches are an attempt to exploit certain attractive properties of the contributon flux, psi = phi phi/sup +/, where phi and phi/sup +/ are the solutions to the forward and adjoint Boltzmann transport equations.
Date:
October 1, 1980
Creator:
Painter, J. W.; Gerstl, S. A. W. & Pomraning, G. C.
Object Type:
Report
System:
The UNT Digital Library
Developments in sensitivity theory
A review of recent developments in sensitivity theory is presented with an emphasis on (a) extensions to new areas such as thermal hydraulics, reactor depletion, multi-constraint and extrema problems, and (b) recent mathematical refinements to and extensions of the basic theory. The diverse new areas of application are discussed from a unified theoretical viewpoint based on nonlinear functional analysis. Several new applications of sensitivity theory are presented for problems in constrained reactor physics calculations, irradiation experiment analysis, reactor burnup calculations, and transient thermal-hydraulic analysis. Future directions of the research are suggested.
Date:
January 1, 1980
Creator:
Cacuci, D. G.; Greenspan, E.; Marable, J. H. & Williams, M. L.
Object Type:
Article
System:
The UNT Digital Library
A Test of the Degree of Association Among Selected Communication Characteristics and Innate Innovativeness
The present study used regression procedures to investigate the relationships between selected communication variables and innate innovativeness. The three general types of variables examined in this study were communication anxiety, communicator style, and selfdisclosiveness. Ten hypotheses were tested together with a descriptive model which was based on the communication variables and their ability to predict innate innovativeness. Results of the tests of the model were confirmed as were the ten hypothesized relationships. The results of the regression analyses performed on the data indicated that receiver apprehension and honesty of self-disclosiveness were negatively and positively associated with innate innovativeness respectively, and were the variables which most significantly impacted the variance of innate innovativeness scores.
Date:
May 1980
Creator:
Judice, Steven C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Compact torus experiments and theory
Two types of compact toroids have been studied: spheromaks and field-reversed configurations (FRC). Spheromaks, which contain both toroidal and poloidal fields, have been formed with a magnetized coaxial injector and trapped in both prolate and oblate flux conservers. As expected from theory, the prolate configuration always tilts, but the oblate configuration can be made stable even in the presence of a guide field. Observations include 150..mu..s lifetimes, <n> approx. 10/sup 14/ cm/sup -3/, and a decrease of field fluctuations by a factor of 100 at the time of complete reconnection. Theoretical studies of the FRC (no toroidal field) have been compared with the results of two field-reversed theta-pinches, FRX-A and FRX-B.
Date:
January 1, 1980
Creator:
Armstrong, W. T.; Barnes, D. C. & Bartsch, R. R.
Object Type:
Article
System:
The UNT Digital Library
The Role of the Invariant Line in the Search for an Optimum Interphase Boundary by O-Lattice Theory
The purpose of the present communication is threefold: -to demonstrate that the interphase boundary determined by Plichta and Aaronson (PA) can be shown analytically to have the lowest energy parameter P of all possible O-lattice boundaries. -to explain the significance of the calculated 0.05{degrees} rotation around [0001] and its relationship to the more general principle of an invariant line. -to show that the optimum interphase boundaries are generally quite different for coherent and semicoherent precipitates having the same Burgers orientation relationship (OR) with the matrix.
Date:
November 1, 1980
Creator:
Dahmen, U.
Object Type:
Article
System:
The UNT Digital Library
Theory of atomic motion in resonant radiation
Atomic motion in resonant and near resonant electromagnetic radiation is investigated theoretically. The exposition begins with a study of atomic motion in a resonant standing light wave, with a view toward isotope separation by selective photodeflection, and proceeds to the investigation of more general problems of atomic motion in resonant radiation. The body of the work consists of six chapters, each of which was prepared as a manuscript for publication in the open literature.
Date:
March 1, 1980
Creator:
Cook, R. J.
Object Type:
Report
System:
The UNT Digital Library
Hamiltonian theory of guiding-center motion
A Hamiltonian treatment of the guiding center problem is given which employs noncanonical coordinates in phase space. Separation of the unperturbed system from the perturbation is achieved by using a coordinate transformation suggested by a theorem of Darboux. As a model to illustrate the method, motion in the magnetic field B=B(x,y)z is studied. Lie transforms are used to carry out the perturbation expansion.
Date:
May 1, 1980
Creator:
Littlejohn, R.G.
Object Type:
Report
System:
The UNT Digital Library
Application of Fuzzy Set Theory to Data Display
Categorization supports decision making and lets an analyst look at data from different perspectives and different levels of detail. An approach to data analysis is described in which membership in subjectively defined categories is modeled by the fuzzy nature of color categories and presented by means of computer graphics for visual inspection by the analyst. 3 figures.
Date:
December 1980
Creator:
Benson, William H.
Object Type:
Article
System:
The UNT Digital Library
Pion condensation and instabilities: current theory and experiment
Current calculations of pion condensation phenomena in symmetric nuclear matter are reviewed. The RPA and MFA methods are compared. Latest results (LBL-10572) with a relativistic MFA theory constrained by bulk nuclear properties are presented. The differences between equilibrium (condensation) and nonequilibrium (dynamic) instabilities are discussed. Finally, two-proton correlation experiments aimed at looking for critical scattering phenomena and two-pion correlation experiments aimed at looking for pion field coherence are analyzed. 10 figures, 2 tables.
Date:
May 1, 1980
Creator:
Gyulassy, M.
Object Type:
Article
System:
The UNT Digital Library
Theory of Transition Times: Catalysis at Rotating Disk Electrodes
An exact solution to the problem of convective diffusion to a rotating disk electrode with a prescribed initial profile and current step conditions at the surface is presented. Based on this solution a current density-transition time relationship is established which in the limit reduces to a previously proposed expression that accounts for experimentally observed deviations from the Sand equation. Applications of this theory in connection with the determination of rate parameters for electroactive species undergoing a catalytic reaction at the electrode surface are discussed.
Date:
March 1, 1980
Creator:
Scherson, Daniel A. & Ross, Philip N.
Object Type:
Article
System:
The UNT Digital Library
Some singular integral equations in linear transport theory
Solutions to the steady-state transport equation for one speed, isotropic scattering in a half-space can be found from singular integral equations with Cauchy principal-value integrals. Galerkin methods for these equations are studied with special emphasis on sensitivity of approximation errors to choice of basis.
Date:
July 1, 1980
Creator:
Mullikin, T. W.
Object Type:
Report
System:
The UNT Digital Library
The Effects of a Partially Structured Christian Marriage Enrichment Program Upon Marital Communication, General Marital Adjustment, and Purpose in Life
The problem of this study was the negative or positive effects of a partially structured Christian marriage enrichment weekend upon marital communication, marital adjustment, and purpose in life. The results indicated that on all four tests both groups improved significantly over a two-month period but not over a one-week period. The general conclusions to be drawn are two-fold. First, a partially structured Christian marriage enrichment weekend, namely Enjoying Marriage, will probably help a couple improve in communication, adjustment, and purpose in life. Second, only on adjustment and purpose in life can one say that such improvement is based specifically upon the content of the weekend. The reason for this is that a weekend retreat group who received no treatment on marriage also improved in communication and on one specific type of marital adjustment as measured by the Polyfactor Sentence Completion Survey.
Date:
May 1980
Creator:
Wilson, Douglas A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Pulsed-laser annealing of ion-implanted GaAs: theory and experiment
It is shown that, in the pulsed-laser irradiation of crystalline or lightly damaged GaAs, good agreement is obtained between measured and calculated thresholds for melting, for catastrophic damage due to vaporization, and for the duration of surface melting at various energy densities. Good agreement between theory and experiment is also obtained for dopant profile spreading during pulsed-laser annealing.
Date:
November 1, 1980
Creator:
Wood, R. F.; Lowndes, D. H. & Christie, W. H.
Object Type:
Article
System:
The UNT Digital Library
Renormalizing the strong-coupling expansion for quantum field theory: present status
Progress made in determining the renormalized strong coupling expansion in quantum field theory is reviewed. Consideration restricted is to lambda phi/sup 4/ field theory in d dimensions. The starting point is the lattice version of the path integral representation for the Green's functions. The unrenormalized strong coupling expansion on the lattice is determined first. This is a series in a dimensionless parameter, x. A simple set of graphical rules for determining the Green's functions of the theory in a power series in x is derived. For finite field theories (d < 2) scheme for extrapolating to zero lattice spacing (a ..-->.. 0) is presented. This scheme determines a sequence of approximants to the unrenormalized strong coupling series in the form of a series. Then the problem of renormalization is considered. For the lattice field theory this consists of eliminating x in favor of y, a renormalized x. For d < 2, M/sub R//sup 2/ = 0 occurs when M/sub 0//sup 2/ ..-->.. - infinity, where M/sub R/ is the renormalized mass and M/sub 0/ is the bare mass, and thus the path integral is dominated by instantons. The renormalized strong coupling expansion is valid for the double well where M/sub …
Date:
January 1, 1980
Creator:
Cooper, F.; Sharp, D.; Bender, C. M.; Guralnik, G. S. & Roskies, R.
Object Type:
Article
System:
The UNT Digital Library
Self-consistent theory of hadron-nucleus scattering. Application to pion physics
The requirement of using self-consistent amplitudes to evaluate microscopically the scattering of strongly interacting particles from nuclei is developed. Application of the idea to a simple model of pion-nucleus scattering is made. Numerical results indicate that the expansion of the optical potential converges when evaluated in terms of fully self-consistent quantities. A comparison of the results to a recent determination of the spreading interaction in the phenomenological isobar-hole model shows that the theory accounts for the sign and magnitude of the real and imaginary part of the spreading interaction with no adjusted parameters. The self-consistnt theory has a strong density dependence, and the consequences of this for pion-nucleus scattering are discussed. 18 figures, 1 table.
Date:
January 1, 1980
Creator:
Johnson, M.B.
Object Type:
Report
System:
The UNT Digital Library
Pion Condensation in a Field Theory Consistent with Bulk Properties of Nuclear Matter
None
Date:
May 1, 1980
Creator:
Banerjee, B.; Glendenning, N.K. & Gyulassy, M.
Object Type:
Article
System:
The UNT Digital Library
Development and applications of multi-step Hauser-Feshbach/pre-equilibrium model theory
A recently developed model that combines compound and precompound reactions with conservation of angular momentum is discussed. This model allows a consistent description of intermediate excitations from which tertiary reaction cross sections can be calculated for transitions to the continuum as well as to the discrete residual levels with known spins and parities. Predicted neutron, proton, and alpha-particle production cross sections and emission spectra from 14-MeV neutron-induced reactions are compared favorably with angle-integrated experimental data for 12 nuclides. The model is further developed to include angular distributions of outgoing particles. The random phase approximation used for the compound stage is partially removed for the precompound stages, allowing off-diagonal terms of the collision matrix to produce both odd and even terms in the Legendre polynomial expansion for the angular distribution. Calculated double differential cross sections for the 14.6-MeV /sup 23/Na(n,n'x) reaction are compared with experimental data.
Date:
January 1, 1980
Creator:
Fu, C.Y.
Object Type:
Article
System:
The UNT Digital Library