Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

University of Texas at Arlington

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 14221 - 14250 of 15842

Full-Text Articles in Entire DC Network

Quasi-Solutions, Vector Lyapunov Functions And Monotone Method, S. Leela, V. Lakshmikantham, M. N. Oguztoreli Feb 1980

Quasi-Solutions, Vector Lyapunov Functions And Monotone Method, S. Leela, V. Lakshmikantham, M. N. Oguztoreli

Mathematics Technical Papers - Archive

It is now well known that the method of vector Lyapunov functions provides an effective tool to investigate the properties of large scale interconnected dynamical and control systems. [3,4,5,11-15]. Several Lyapunov functions result in a natural way in the study of such systems by the decomposition and aggregation method [1-4,12-14]. However an unpleasant fact in this approach is the requirement of quasi-monotone property on the comparison system since comparison systems with a desired property like stability exist without satisfying quasi-monotone property. Also in the study of comparison theorems and extremal solutions for differential systems one usually imposes this quasi-monotone property. …


Quasi-Solutions And Monotone Method For Systems Of Nonlinear Boundary Value Problems, A. S. Vatsala, V. Lakshmikantham Feb 1980

Quasi-Solutions And Monotone Method For Systems Of Nonlinear Boundary Value Problems, A. S. Vatsala, V. Lakshmikantham

Mathematics Technical Papers - Archive

In the study of comparison theorems, existence of extremal solutions and monotone iterative techniques for initial and boundary value problems of ordinary differential systems, it becomes necessary to impose a condition generally known as quasi-monotone property [1,3,5]. In systems which represent physical situations such as a model governing the combustion of a material, quasi-monotonicity is not satisfied, see [4]. However a kind of mixed monotone property holds. To deal with such situations the notion of quasi-solutions was systematically developed in [4]. In this paper, we investigate monotone iterative method for systems of nonlinear boundary value problems when the system possesses …


Some Theorems On Fixed Points In Lipschitz And Kannan Type Mappings, B. B. Williams, A. A. Gillespie Jan 1980

Some Theorems On Fixed Points In Lipschitz And Kannan Type Mappings, B. B. Williams, A. A. Gillespie

Mathematics Technical Papers - Archive

No abstract provided.


Reveille 1980 (Uta Yearbook 1980), The University Of Texas At Arlington Jan 1980

Reveille 1980 (Uta Yearbook 1980), The University Of Texas At Arlington

UTA Yearbooks

Archived yearbook of the University of Texas at Arlington or a preceding institution, digitized and preserved by UTA Libraries Special Collection in 2023


Saed News V1, N2, Spring 1980, School Of Architecture And Environmental Design Jan 1980

Saed News V1, N2, Spring 1980, School Of Architecture And Environmental Design

School of Architecture and Environmental Design Publications - Archive

The School of Architecture and Environmental Design publication, Spring 1980.


A Comprehensive View Of Brazil, Texas Education Agency. Division Of Curriculum Development. Social Studies Section Jan 1980

A Comprehensive View Of Brazil, Texas Education Agency. Division Of Curriculum Development. Social Studies Section

Documents from the State of Texas-Archive

Until recent years, Brazil's image was associated with the exotic Amazon forest, Rio's carnival, soccer, and coffee exportation. However, these simplified generalizations lend themselves to misunderstandings about Brazil, its people, and their culture. This publication is designed to give up-to-date information on modern Brazil. It was written by Albenides Ramos of Rio de Janeiro who, during the 1978-79 school year, served as a foreign curriculum consultant for the Texas Education Agency under Public Law 87-256, the Mutual Educational and Cultural Exchange Act of 1961. One of Mr. Ramos' duties while at the Texas Education Agency was to develop A Comprehensive …


Premature Mortality, Texas, 1978, Texas Bureau Of State Health Planning & Resource Development. Division Of Data Collection And Analysis Jan 1980

Premature Mortality, Texas, 1978, Texas Bureau Of State Health Planning & Resource Development. Division Of Data Collection And Analysis

Documents from the State of Texas-Archive

Overall statistics on causes of death are dominated by the fact that most deaths occur in the older population, typically over the age of 65. In 1978, for example, over 60 percent of all deaths in Texas occurred in this age group. As a result, the impact of the major causes of death is greatly influenced by mortality late in life. Evaluating mortality in this manner assumes that in terms of societal costs, each instance of death is equal. From this perspective, the death of an individual at age 25 is viewed no differently from that of an individual at …


1980 Texas Outdoor Recreation Plan : 1981-1983 Action Program, Texas Parks And Wildlife Department Comprehensive Planning Branch Jan 1980

1980 Texas Outdoor Recreation Plan : 1981-1983 Action Program, Texas Parks And Wildlife Department Comprehensive Planning Branch

Documents from the State of Texas-Archive

"The Parks and Wildlife Department has prepared this 1980 Texas Outdoor Recreation Plan as part of its responsibility to strive for the provision of adequate recreational land, water, and associated facilities in every region of the State. As a five-year document, this Plan should serve as a flexible guide for action in providing recreational opportunities throughout the State in the coming years. It provides an inventory and analysis of our existing recreational resources and facilities as provided by private and public sources, including all sectors of government. Further, it includes data and recommendations for use in planning and decision-making relative …


The University Of Texas At Arlington Graduate Catalog 1980-1981, The University Of Texas At Arlington Jan 1980

The University Of Texas At Arlington Graduate Catalog 1980-1981, The University Of Texas At Arlington

UTA Graduate Catalogs

No abstract provided.


American Literary Scholarship: An Annual 1978, J. Albert Robbins, Wendell Glick, J. Donald Crowley, Donald B. Stauffer, Hershel Parker, Willis J. Buckingham, Louis J. Budd, Robert L. Gale, George Bornstein, Stuart Y. Mcdougal, Panthea Reid Broughton, Jackson R. Bryer, William J. Scheick, Thomas Wortham, David Stouck, Jack Salzman, James H. Justus, Richard Crowder, James E. Breslin, Winifred Frazer, Darwin T. Turner, Michael J. Hoffman, Maurice Couturier, Hans Galinsky, Rolando Anzilotti, Keiko Beppu, Rolf Lunden Jan 1980

American Literary Scholarship: An Annual 1978, J. Albert Robbins, Wendell Glick, J. Donald Crowley, Donald B. Stauffer, Hershel Parker, Willis J. Buckingham, Louis J. Budd, Robert L. Gale, George Bornstein, Stuart Y. Mcdougal, Panthea Reid Broughton, Jackson R. Bryer, William J. Scheick, Thomas Wortham, David Stouck, Jack Salzman, James H. Justus, Richard Crowder, James E. Breslin, Winifred Frazer, Darwin T. Turner, Michael J. Hoffman, Maurice Couturier, Hans Galinsky, Rolando Anzilotti, Keiko Beppu, Rolf Lunden

Covers, Titles, and Tables: The Formations of American Literary Canons in Anthologies - Archive

Contains Title Page, Copyright Page, and Table of Contents


Two Sites In Uvalde County: The Elm Creek Site (41 Uv 67), Wayne C. Young Dec 1979

Two Sites In Uvalde County: The Elm Creek Site (41 Uv 67), Wayne C. Young

Documents from the Texas State Department of Highways-Archive

Site 41 UV 67 represented a shallow and mixed multicomponent prehistoric campsite on an intermittent drainage in eastern Uvalde County, Texas. A possible living floor was located during testing of the site. This floor contained two hearths and four possible postholes in a mixed context with prehistoric artifacts of differing temporal periods and modern historic trash. Due to the badly mixed nature of the deposits and the lack of cultural integrity, the excavation was discontinued.


Two Sites In Uvalde County: The Cooks Slough Site, Uvalde County, Texas, Clive J. Luke Dec 1979

Two Sites In Uvalde County: The Cooks Slough Site, Uvalde County, Texas, Clive J. Luke

Documents from the Texas State Department of Highways-Archive

During the month of October 1975, a small prehistoric site, 41 UV 68, was subjected to an archaeological test. No archaeological features were located but a zone containing artifactual material of mixed temporal context was explored. The site appears to be a minor manifestation of prehistoric occupations in the Uvalde area.


A Monte Carlo Power Study Of K-Sample Tests For Exponentiality, Mickie Sue Harbin, Danny D. Dyer Dec 1979

A Monte Carlo Power Study Of K-Sample Tests For Exponentiality, Mickie Sue Harbin, Danny D. Dyer

Mathematics Technical Papers - Archive

Suppose one has a collection of k independent samples where the ith sample size is [see pdf for notation]. Let [see pdf for notation] denote the ordered observations in the ith sample. A number of test procedures are available to jointly test for exponentiality of the collection of independent samples, that is [see pdf for notation] is the probability density function (pdf) of the ith population. These include the k-sample Durbin (1975) test, the k-sample Shapiro-Wilk (1972) W-exponential test, the k-sample Tiku (1974) test, and a test procedure derived by Dyer (1979) which is based on a characterization of the …


On The Existence Of Positive Solutions For Non-Linear Elliptic Equations, Giovanni Vidossich Nov 1979

On The Existence Of Positive Solutions For Non-Linear Elliptic Equations, Giovanni Vidossich

Mathematics Technical Papers - Archive

No abstract provided.


Generalized Hopf Bifurcation And H-Asymptotic Stability, L. Salvadori, Stephen R. Bernfeld Nov 1979

Generalized Hopf Bifurcation And H-Asymptotic Stability, L. Salvadori, Stephen R. Bernfeld

Mathematics Technical Papers - Archive

The prevalent approach to the Hopf bifurcation problem is to prove directly the existence of the bifurcating periodic orbits by using such standard procedures as the implicit function theorem, the LiapunovSchmidt method and its known variants, and topological degree arguments (see [7]). The phenomenon of Hopf bifurcation often occurs because of exchange of stability properties of the equilibrium under perturbations (see for instance, Chafee in [7] p. 85-88,Andronov et. al. [1], Marchetti et. al. [6] and Negrini and Salvadori [8]). This connection between the exchange of stability of the equilibrium and the appearance of bifurcating periodic orbits can be carefully …


Practical Stability And Lyapunov Functions, V. Lakshmikantham, Stephen R. Bernfeld Oct 1979

Practical Stability And Lyapunov Functions, V. Lakshmikantham, Stephen R. Bernfeld

Mathematics Technical Papers - Archive

The notion of "practical stability" was discussed in the monograph by LaSalle and Lefschetz [6] in which they point out that stability investigations may not assure "practical stability" and vice versa. For example an aircraft may oscillate around a mathematically unstable path, yet its performance may be acceptable. Motivated by this, Weiss and Infante introduced the concept of finite time stability [7]. They were interested in the behavior of systems contained within specified bounds during a fixed time interval. Many problems fall into this category including the travel of a space vehicle between two points and the problem, in a …


On The Existence And Uniqueness Of Periodic Solutions Of Second Order Ordinary Differential Equations, Giovanni Vidossich Oct 1979

On The Existence And Uniqueness Of Periodic Solutions Of Second Order Ordinary Differential Equations, Giovanni Vidossich

Mathematics Technical Papers - Archive

No abstract provided.


Generalized Hopf Bifurcation In Rn And H-Asymptotic Stability, L. Salvadori, Stephen R. Bernfeld Oct 1979

Generalized Hopf Bifurcation In Rn And H-Asymptotic Stability, L. Salvadori, Stephen R. Bernfeld

Mathematics Technical Papers - Archive

No abstract provided.


A New Computer Approach To Atomic Electron Configuartions With Application To The Elements From Helium Through Oxygen, Donald Greenspan Oct 1979

A New Computer Approach To Atomic Electron Configuartions With Application To The Elements From Helium Through Oxygen, Donald Greenspan

Mathematics Technical Papers - Archive

In this paper a new, computer approach is developed for atomic and molecular dynamics. Though classical in nature, it includes all electron-electron interactions. Experimental ionization energies are used to determine average radial distances and velocities for atoms. Computer examples for symmetric and nonsymmetric electron motions are described and discussed. Auto-ionization results fix the nonadmissibility of a significant class of electron configurations.


Comparison, Existence, Uniqueness And Successive Approximations For The Dirichlet Problem Of Elliptic Equations, Giovanni Vidossich Oct 1979

Comparison, Existence, Uniqueness And Successive Approximations For The Dirichlet Problem Of Elliptic Equations, Giovanni Vidossich

Mathematics Technical Papers - Archive

No abstract provided.


Existence Of Extremal Solutions And Comparison Results For Delay Differential Equations In Abstract Cones, R. L. Laughn, A. S. Vatsala Oct 1979

Existence Of Extremal Solutions And Comparison Results For Delay Differential Equations In Abstract Cones, R. L. Laughn, A. S. Vatsala

Mathematics Technical Papers - Archive

The study of Cauchy problem for ordinary differential equations in a Banach space has been extensive [2,4,10]. It is of interest to look at the corresponding problem for delay differential equations since such equations occur in many physical problems. Existence of solutions of such equations are considered in [6,8,9] using monotonicity conditions and dissipative conditions.In this paper our objective is to prove the existence of extremal solutions for the delay differential equation [see pdf for notation] (1.1) relative to a cone k of the Banach space E. For this purpose, we begin by proving an existence result under a simple …


Quasi-Solutions And Their Role In The Qualitative Theory Of Differential Equations, V. Lakshmikantham, K. Deimling Aug 1979

Quasi-Solutions And Their Role In The Qualitative Theory Of Differential Equations, V. Lakshmikantham, K. Deimling

Mathematics Technical Papers - Archive

In the study of comparison theorems and extremal solutions for systems of ordinary differential equations [5], one usually imposes a condition on the right hand side known as quasi-monotone nondecreasing property. This property. is also needed in proving comparison theorems for second order, boundary value problems [9] as well as for the initial boundary value problem for parabolic systems [5, 6]. Also, it is well known that in the .method of vector Lyapunov functions which provides an effective tool to investigate the stability of Large Scale Systems [1-4], an unpleasant drawback is the requirement of the quasi-monotone property for the …


Equations With Unbounded Delay: A Survey, V. Lakshmikantham, C. Corduneanu Aug 1979

Equations With Unbounded Delay: A Survey, V. Lakshmikantham, C. Corduneanu

Mathematics Technical Papers - Archive

The theory of equations with delay has been considerably developed during the past 30 years. The first book dedicated to this subject has been published by A. D. Myshkis [180], in 1951, and has been subsequently translated into German (1955) and English (1966). A second Russian edition, that came out in 1972, contains a good deal of references and points out interesting features of the theory of linear equations with delayed argument, including also examples of equations with unbounded delay.


A Survey Of Certain K-Sample Test Procedures With Applications To Lpr-5 Data, Danny D. Dyer Jul 1979

A Survey Of Certain K-Sample Test Procedures With Applications To Lpr-5 Data, Danny D. Dyer

Mathematics Technical Papers - Archive

When dealing with k independent samples, it is frequently of interest to jointly assess the underlying population distributions. Usually such an assessment is carried out by performing k independent tests; that is, we test the null hypothesis [see pdf for notation] that the population from which the [see pdf for notaion] sample was drawn has some specified distribution. Combining the results of such independent tests may then be carried out by Fisher's method (1950, pp. 99-101). Specifically, let Ti be the test statistic associated with the [see pdf for notaion] sample. Suppose large values of Ti are considered critical for …


Stochastic Parameters In Compartmental Systems And Structural Identification, Jerome Eisenfeld Jul 1979

Stochastic Parameters In Compartmental Systems And Structural Identification, Jerome Eisenfeld

Mathematics Technical Papers - Archive

Let [see pdf for notation] denote the mean time a particle resides in i having started in j and let [see pdf for notation] denote the probability that a particle reaches i from j. These parameters, expressed in terms of the fractional transfer coefficients, provide an interpretation and a representation of the transfer function which are useful for determining the identifiable parameters in an input-output experiment. In particular the transfer function is expressed in terms of other transfer functions which represent smaller subsystems along the flow.


On The Determination Of Critical Values For Bartlett's Test, Jerome P. Keating, Danny D. Dyer Jun 1979

On The Determination Of Critical Values For Bartlett's Test, Jerome P. Keating, Danny D. Dyer

Mathematics Technical Papers - Archive

The exact critical values for Bartlett's test for homogeneity of variances based on equal sample sizes from several normal populations are tabulated. It is also shown how these values may be used to obtain highly accurate approximations to the critical values for unequal sample sizes.


A New Approach To Computer Oriented, Quasi-Quantum Mechanical Dynamics, Donald Greenspan Jun 1979

A New Approach To Computer Oriented, Quasi-Quantum Mechanical Dynamics, Donald Greenspan

Mathematics Technical Papers - Archive

A new approach to atomic and molecular dynamics is developed which combines both quantum and classical concepts. Applications are made to the hydrogen atom, the hydrogen ion, and the hydrogen molecule. An accurate computer technique for the approximation of bond lengths is developed and illustrative examples of electron motions are described and discussed. Uncertainty results naturally from a mathematical statement of total system energy, which is always quantized. Angular momentum can be zero and need not be quantized, thereby avoiding inconsistencies of Bohr-Sommerfeld type models.


Comparison Results For Reaction-Diffusion Equations In A Banach Space, V. Lakshmikantham Jun 1979

Comparison Results For Reaction-Diffusion Equations In A Banach Space, V. Lakshmikantham

Mathematics Technical Papers - Archive

Let T be the temperature and n the concentration of a combustible substance. A simple model governing the combustion of the material is given by [see pdf for notations] (1.1) where the constant Q is the heat of reaction; the constants Kl , K2 are thermal, material diffusion coefficients; the term exp(-E/RT) is the Arrenhius rate factor; E is the activation energy; and R is the univeral gas constant. Equations (1.1) are considered on a bounded domain ^ with the boundary conditions [see pdf for notations] (1.2) together with initial conditions [see pdf for notations] (1.3) under the assumption T0(x) …


Selected Issues Pertaining To Service Fees Of Texas Counties, Texas Advisory Commission On Intergovernmental Relations May 1979

Selected Issues Pertaining To Service Fees Of Texas Counties, Texas Advisory Commission On Intergovernmental Relations

Documents from the State of Texas-Archive

This report highlights several county service fee issues and also discusses the need for a comprehensive study of "fees of office," the major source of county fee revenue. The report was authorized by the Commission for the purpose of contributing to the improved use of service fees by county governments in the state. The Commission approved the report at its meeting on May 11, 1979 for publication as an informational report incorporating final action by the 66th Legislature on legislation discussed in it.


On Mean Residence Times In Compartments, Jerome Eisenfeld May 1979

On Mean Residence Times In Compartments, Jerome Eisenfeld

Mathematics Technical Papers - Archive

This paper is concerned with a set of parameters which measure the mean time a random particle resides in individual compartments in response to a given load distribution. These parameters are related to other time parameters and to each other.