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Foundations of S-matrix theory. Appendix A. The pragmatic interpretation of quantum theory
None
Date:
June 10, 1974
Creator:
Stapp, Henry P.
Object Type:
Report
System:
The UNT Digital Library
Phenomenological Theory of the Photoevaporation Front Instability
The dynamics of photoevaporated molecular clouds is determined by the ablative pressure acting on the ionization front. An important step in the understanding of the ensuing motion is to develop the linear stability theory for the initially flat front. Despite the simplifications introduced by the linearization, the problem remains quite complex and still draws a lot of attention. The complexity is related to the large number of effects that have to be included in the analysis: acceleration of the front, possible temporal variation of the intensity of the ionizing radiation, the tilt of the radiation flux with respect to the normal to the surface, and partial absorption of the incident radiation in the ablated material. In this paper, we describe a model where all these effects can be taken into account simultaneously, and a relatively simple and universal dispersion relation can be obtained. The proposed phenomenological model may prove to be a helpful tool in assessing the feasibility of the laboratory experiments directed towards scaled modeling of astrophysical phenomena.
Date:
April 10, 2006
Creator:
Ryutov, D. D.; Kane, J. O.; Mizuta, A.; Pound, M. W. & Remington, B. A.
Object Type:
Article
System:
The UNT Digital Library
TORUS: Theory of Reactions for Unstable ISotopes
None
Date:
September 10, 2012
Creator:
Thompson, I J
Object Type:
Report
System:
The UNT Digital Library
The Role of Dynamic Systems Theory in Motor Development Research: How Does Theory Inform Practice and What Are the Potential Implications for Autism Spectrum Disorder?
This article reviews 18 instances in the literature where dynamic systems theory (DST) has been used to analyze, test, or manipulate motor patterns and movement.
Date:
August 10, 2016
Creator:
Colombo-Dougovito, Andrew M.
Object Type:
Article
System:
The UNT Digital Library
Scharz Preconditioners for Krylov Methods: Theory and Practice
Several numerical methods were produced and analyzed. The main thrust of the work relates to inexact Krylov subspace methods for the solution of linear systems of equations arising from the discretization of partial di#11;erential equa- tions. These are iterative methods, i.e., where an approximation is obtained and at each step. Usually, a matrix-vector product is needed at each iteration. In the inexact methods, this product (or the application of a preconditioner) can be done inexactly. Schwarz methods, based on domain decompositions, are excellent preconditioners for thise systems. We contributed towards their under- standing from an algebraic point of view, developed new ones, and studied their performance in the inexact setting. We also worked on combinatorial problems to help de#12;ne the algebraic partition of the domains, with the needed overlap, as well as PDE-constraint optimization using the above-mentioned inexact Krylov subspace methods.
Date:
May 10, 2013
Creator:
Szyld, Daniel B.
Object Type:
Report
System:
The UNT Digital Library
A Comprehensive Theory of Yielding and Failure for Isotropic Materials
A theory of yielding and failure for homogeneous and isotropic materials is given. The theory is calibrated by two independent, measurable properties and from those it predicts possible failure for any given state of stress. It also differentiates between ductile yielding and brittle failure. The explicit ductile-brittle criterion depends not only upon the material specification through the two properties, but also and equally importantly depends upon the type of imposed stress state. The Mises criterion is a special (limiting) case of the present theory. A close examination of this case shows that the Mises material idealization does not necessarily imply ductile behavior under all conditions, only under most conditions. When the first invariant of the yield/failure stress state is sufficiently large relative to the distortional part, brittle failure will be expected to occur. For general material types, it is shown that it is possible to have a state of spreading plastic flow, but as the elastic-plastic boundary advances, the conditions for yielding on it can change over to conditions for brittle failure because of the evolving stress state. The general theory is of a three dimensional form and it applies to full density materials for which the yield/failure strength in …
Date:
August 10, 2006
Creator:
Christensen, R M
Object Type:
Article
System:
The UNT Digital Library
Neutron Physics Division Annual Progress Report for Period Ending August 1, 1963
Separate abstracts were prepared for forty of the sixtytwo sections in the report. Three papers included were previously abstracted for NSA. (D.C.W.)
Date:
December 10, 1963
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The “Malevolent” Benevolence: what happens to perceived immigrant threat when value priorities collide?
This article examines how self-transcending human values affect perceptions of immigrant threat. Results show that benevolence and universalism tend to affect perceived immigrant threat in opposite directions. A part of individuals’ anti-immigrant bias does not stem from strictly self-interested motivations, as often proposed, but by a sense of loyalty to the interests of our immediate contacts.
Date:
February 10, 2021
Creator:
Grigoropoulou, Nikolitsa
Object Type:
Article
System:
The UNT Digital Library
Bottom-up assembly of metallic germanium
This article demonstrates that free electrons from distinct 2D dopant layers coalesce into a homogeneous 3D conductor using anisotropic quantum interference measurements, atom probe tomography, and density functional theory.
Date:
August 10, 2015
Creator:
Scappucci, Giordano; Klesse, Wolfgang M.; Yeoh, LaReine A.; Carter, Damien J.; Warschkow, Oliver; Marks, Nigel A. et al.
Object Type:
Article
System:
The UNT Digital Library
Designing stable finite state machine behaviors using phase plane analysis and variable structure control
This paper discusses how phase plane analysis can be used to describe the overall behavior of single and multiple autonomous robotic vehicles with finite state machine rules. The importance of this result is that one can begin to design provably asymptotically stable group behaviors from a set of simple control laws and appropriate switching points with decentralized variable structure control. The ability to prove asymptotically stable group behavior is especially important for applications such as locating military targets or land mines.
Date:
March 10, 1998
Creator:
Feddema, J. T.; Robinett, R. D. & Driessen, B. J.
Object Type:
Article
System:
The UNT Digital Library
Prediction of the Thermal Conductivity of Fused Salts
A method for predicting thermal conductivities of fused salts and salt mixtures at their melting points was developed. It allows for the atomic or lattice portion arising from the short-range order present in liquids, and the ionic portion arising from a drift of ions and subsequent energy transfer between the atoms. (J.R.D.)
Date:
August 10, 1956
Creator:
Gambill, W. R.
Object Type:
Report
System:
The UNT Digital Library
Providing access: The difference between sharing and just reporting geographical information systems and engineering information/information technology organizational data
The concept for Corporate computer-aided design (CAD)/computer-aided engineering (CAE)/geographical information systems (GIS) and engineering information (EI)/ information technology (IT), and the sharing of this information is becoming popular as organizations flatten (or perhaps become more hollow) and as their functions merge into processes. However, not much is known about information sharing: why sharing happens, whit it does not, how much sharing is desirable, and how to manage it. This paper takes a look at these important issues.
Date:
June 10, 1996
Creator:
Norton, F.J.
Object Type:
Article
System:
The UNT Digital Library
Testing of ENDF/B-IV-P evaluations with SDT-10 benchmark pulsed spheres
None
Date:
May 10, 1974
Creator:
Howerton, Robert J.
Object Type:
Report
System:
The UNT Digital Library
MAGNETIC PROPERTIES OF INSULATORS. Quarterly Report, May 16-August 15, 1965
None
Date:
December 10, 1965
Creator:
Noble, G.
Object Type:
Report
System:
The UNT Digital Library
Guidelines - A Primer for Communicating Effectively with NABIR Stakeholders
This version of the communication primer comprises two interlocking parts: Pat 1, a practical section, intended to prepare you for public interactions, and Part 2, a theoretical section that provides social and technical bases for the practices recommended in Part 1. The mutual support of practice and theory is very familiar in science and clearly requires a willingness to observe and revise our prior assumptions--in this document, we invoke both. We hope that is offering will represent a step both towards improving practice and maturing the theory of practical science communication.
Date:
February 10, 2004
Creator:
Weber, James R.; Schell, Charlotte J.; Marino, T & Bilyard, Gordon R.
Object Type:
Report
System:
The UNT Digital Library
Compendium of computer codes for the researcher in magnetic fusion energy
This is a compendium of computer codes, which are available to the fusion researcher. It is intended to be a document that permits a quick evaluation of the tools available to the experimenter who wants to both analyze his data, and compare the results of his analysis with the predictions of available theories. This document will be updated frequently to maintain its usefulness. I would appreciate receiving further information about codes not included here from anyone who has used them. The information required includes a brief description of the code (including any special features), a bibliography of the documentation available for the code and/or the underlying physics, a list of people to contact for help in running the code, instructions on how to access the code, and a description of the output from the code. Wherever possible, the code contacts should include people from each of the fusion facilities so that the novice can talk to someone ''down the hall'' when he first tries to use a code. I would also appreciate any comments about possible additions and improvements in the index. I encourage any additional criticism of this document. 137 refs.
Date:
March 10, 1989
Creator:
Porter, G.D. (ed.)
Object Type:
Report
System:
The UNT Digital Library
Recent results from hadron colliders
This is a summary of some of the many recent results from the CERN and Fermilab colliders, presented for an audience of nuclear, medium-energy, and elementary particle physicists. The topics are jets and QCD at very high energies, precision measurements of electroweak parameters, the remarkably heavy top quark, and new results on the detection of the large flux of B mesons produced at these machines. A summary and some comments on the bright prospects for the future of hadron colliders conclude the talk. 39 refs., 44 figs., 3 tabs.
Date:
December 10, 1990
Creator:
Frisch, H.J. (Chicago Univ., IL (USA))
Object Type:
Article
System:
The UNT Digital Library
Neutron scattering on nuclei near A = 60 and A = 90
Over a wide range of incident energies, the total cross section and angular distributions for elastic scattering of neutrons from nuclei in these mass regions are analyzed using the spherical-optical-statistical model. The effect of a real-surface-peaked potential, predicted by dispersion relations, is considered. It is found that when the data on a given nucleus between say, 4.5 and 10 MeV, are analyzed simultaneously one obtains a smooth energy variation of the optical model parameters. Moreover, this parameterization may be used to predict, quite accurately, at least the total cross sections up to 20 MeV. The parameters characterizing the model are quite different in the two mass regions. However, a comparison of the optical model results for (/sup 89/Y and /sup 93/Nb indicates that near A = 90 the real well parameters are nearly the same for the two nuclei and that the volume integrals of the imaginary potentials are similar. 16 refs., 9 figs., 2 tabs.
Date:
October 10, 1986
Creator:
Lawson, R. D. & Smith, A. B.
Object Type:
Article
System:
The UNT Digital Library
The Panola Watchman (Carthage, Tex.), Vol. 128, No. 82, Ed. 1 Wednesday, October 10, 2001
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
October 10, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Improving Human Reliability through Better Nuclear Power Plant System Design: Program for Advanced Nuclear Power Studies. Progress Report
The project on ``Development of a Theory of the Dependence of Human Reliability upon System Designs as a Means of Improving Nuclear Power Plant Performance`` was been undertaken in order to address the problem of human error in advanced nuclear power plant designs. Lack of a mature theory has retarded progress in reducing likely frequencies of human errors. Work being pursued in this project is to perform a set of experiments involving human subjects who are required to operate, diagnose and respond to changes in computer-simulated systems, relevant to those encountered in nuclear power plants, which are made to differ in complexity in a systematic manner. The computer program used to present the problems to be solved also records the response of the operator as it unfolds.
Date:
October 10, 1993
Creator:
Golay, M. W.
Object Type:
Report
System:
The UNT Digital Library
Collider Phenomenology of Extra Dimensions
In recent years there has been much interest in the possibility that there exist more spacetime dimensions than the usual four. Models of particle physics beyond the Standard Model that incorporate these extra dimensions can solve the gauge hierarchy problem and explain why the fermion masses a spread over many orders of magnitude. In this thesis we explore several possibilities for models with extra dimensions. First we examine constraints on the proposal of Arkani-Hamed and Schmaltz that the Standard Model fermions are localized to different positions in an extra dimension, thereby generating the hierarchy in fermion masses. We find strong constraints on the compactification scale of such models arising from flavor-changing neutral currents. Next we investigate the phenomenology of the Randall-Sundrum model, where the hierarchy between the electroweak and Planck scales is generated by the warping in a five-dimensional anti-de Sitter space. In particular, we investigate the ''Higgsless'' model of electroweak symmetry breaking due to Csaki et. al., where the Higgs has been decoupled from the spectrum by taking its vacuum expectation value to infinity. We find that this model produces many distinctive features at the LHC. However, we also find that it is strongly constrained by precision electroweak observables …
Date:
March 10, 2006
Creator:
Lillie, Benjamin Huntington
Object Type:
Report
System:
The UNT Digital Library
Improving human reliability through better nuclear power plant system design. Progress report
The project on {open_quotes}Development of a Theory of the Dependence of Human Reliability upon System Designs as a Means of Improving Nuclear Power Plant Performance{close_quotes} has been undertaken in order to address the important problem of human error in advanced nuclear power plant designs. Most of the creativity in formulating such concepts has focused upon improving the mechanical reliability of safety related plant systems. However, the lack of a mature theory has retarded similar progress in reducing the likely frequencies of human errors. The main design mechanism used to address this class of concerns has been to reduce or eliminate the human role in plant operations and accident response. The plan of work being pursued in this project is to perform a set of experiments involving human subject who are required to operate, diagnose and respond to changes in computer-simulated systems, relevant to those encountered in nuclear power plants. In the tests the systems are made to differ in complexity in a systematic manner. The computer program used to present the problems to be solved also records the response of the operator as it unfolds. Ultimately this computer is also to be used in compiling the results of the project. …
Date:
January 10, 1995
Creator:
Golay, M. W.
Object Type:
Report
System:
The UNT Digital Library
High Rate Physics at Neutrino Factories
None
Date:
June 10, 1999
Creator:
King, B. J.
Object Type:
Article
System:
The UNT Digital Library
DISCUSSION OF AN ACTIVATION METHOD FOR MEASURING THE RATIO OF U$sup 238$ ABSORPTION TO U$sup 235$ FISSION IN A REACTOR
The theory is presented in detail of an activation method for measuring the ratio of U/sup 238/ absorptions to U/sup 235/ fissions in a nuclear reactor. The origin of the activities is discussed, the equations are given for interpretation of the measurements, and the expected counting rates are computed for a typical experiment in the EGCR. (auth)
Date:
August 10, 1962
Creator:
Preskitt, C.A.
Object Type:
Report
System:
The UNT Digital Library