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Phase Space Structures In Chaotic Quantum Dynamics., Barbara Smetana Helmkamp Jan 1995

Phase Space Structures In Chaotic Quantum Dynamics., Barbara Smetana Helmkamp

LSU Historical Dissertations and Theses

I compare the quantum and classical dynamics of a particle moving in a cosine potential while subject to a time-dependent force. I concentrate here on the behavior of an initially well-localized wave packet at times before the classically chaotic motion is fully developed. I find that the quantum and classical dynamics are indistinguishable well beyond the Ehrenfest time where the wave packet delocalizes. The quantum and classical descriptions first differ precisely when the classical probability density is folded in the vicinity of a hyperbolic fixed point. At this point, the wave function acquires a nodal structure which I show to …

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Parallel Algorithms For Constructing Convex Hulls., Jigang Liu Jan 1995

Parallel Algorithms For Constructing Convex Hulls., Jigang Liu

LSU Historical Dissertations and Theses

For a given set of planar points S, the convex hull of S, CH(S), is defined to be a list of ordered points which represents the smallest convex polygon that contains all of the points. The convex hull problem, one of the most important problems in computational geometry, has many applications in areas such as computer graphics, simulation and pattern recognition. There are two strategies used in designing parallel convex hull algorithms. One strategy is the divide-and-conquer paradigm. The disadvantage to this strategy is that the recursive merge step is complicated and difficult to implement on current parallel machines. The …

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The Association Between Anticyclonic Weather Changes Over The Central Gulf Coast And Large-Scale Circulation Changes., Robert V. Rohli Jan 1995

The Association Between Anticyclonic Weather Changes Over The Central Gulf Coast And Large-Scale Circulation Changes., Robert V. Rohli

LSU Historical Dissertations and Theses

Trends in winter extratropical anticyclonic weather type frequencies (1961-1989) were examined for New Orleans, Louisiana, in order to identify the effects of global climatic change on regional-scale circulation changes over the central Gulf Coast. The number of days dominated by surface continental anticyclones (CH days) was found to have decreased significantly over time, while Pacific anticyclone (PH) frequency showed significant temporal increase. Therefore, 50 kPa geopotential height variability, 50 kPa geostrophic flow, and surface atmospheric variables were examined to determine whether changes in these features have accompanied the frequency changes in weather types. Prior to PH days, areas of greatest …

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An Insider's View: The Teacher As Impetus In Literacy Acquisition., Kerry Pierce Laster Jan 1995

An Insider's View: The Teacher As Impetus In Literacy Acquisition., Kerry Pierce Laster

LSU Historical Dissertations and Theses

The purpose of this study was to derive a deeper understanding of one successful kindergarten teacher, her behaviors, and her effect on students as they develop early literacy skills. This study examined the following aspects of teacher behavior as they related to early literacy development: (a) the interactions of the teacher with regular education and special education inclusion students in an inclusive kindergarten classroom with holistic, language-based curricula, (b) the behaviors of the teacher while engaging students in the literacy processes of reading and writing, (c) the behaviors of the teacher as she encouraged students to react to books using …

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Follicular Development Patterns Of Pregnant Mares During The First Half Of Gestation., Marius Meintjes Jan 1995

Follicular Development Patterns Of Pregnant Mares During The First Half Of Gestation., Marius Meintjes

LSU Historical Dissertations and Theses

Information gained by studying follicular wave and endocrinological patterns of pregnant mares, may be useful in understanding reproductive wastage, infertility, control of the estrous cycle and physiological function of equine chorionic gonadotropin (eCG). Furthermore, supplementary follicular development, characteristic of the early equine pregnancy, may be used to harvest oocytes for gamete intrafallopian tube transfer and in vitro fertilization (IVF) procedures. The objectives of this study were to: characterize follicular wave patterns during the first half of the equine pregnancy; relate follicular development patterns to serum levels of estradiol-17$\beta$, progesterone, FSH and eCG; evaluate the effect of fetal genotype on follicular …

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Lsu General Catalog 1995-1996, Louisiana State University And Agricultural And Mechanical College Jan 1995

Lsu General Catalog 1995-1996, Louisiana State University And Agricultural And Mechanical College

LSU General Catalog

The LSU General Catalog describes all undergraduate and graduate departments and programs with degree requirements and courses offered for each one. The General Catalog includes information on registration and financial aid as well as academic services offered to all students.

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Dirichlet Convolution Inverses And Solution Of Integral Equations, Ricardo Estrada Jan 1995

Dirichlet Convolution Inverses And Solution Of Integral Equations, Ricardo Estrada

Faculty Publications

A method for the solution of integral equations based on the concepts of Dirichlet convolutions and convolution inverses is presented. This method generalizes the procedures of Chen. © 1995, Rocky Mountain Mathematics Consortium. All Rights Reserved.

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Regularization And Asymptotic Expansion Of Certain Distributions Defined By Divergent Series, Ricardo Estrada Jan 1995

Regularization And Asymptotic Expansion Of Certain Distributions Defined By Divergent Series, Ricardo Estrada

Faculty Publications

The regularration of tliedistribution [formula omitted]. whichgives a regularized value to the divergent series [formula omitted] is obtained in several spaces of test functions. The asymptotic expansion as ε →0+ of series of the type [formula omitted] is also obtained. © 1995, Hindawi Publishing Corporation. All rights reserved.

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Head-On Collision Of Two Black Holes: Comparison Of Different Approaches, Peter Anninos, Richard H. Price, Jorge Pullin, Edward Seidel, Wai Mo Suen Jan 1995

Head-On Collision Of Two Black Holes: Comparison Of Different Approaches, Peter Anninos, Richard H. Price, Jorge Pullin, Edward Seidel, Wai Mo Suen

Faculty Publications

A benchmark problem for numerical relativity has been the head-on collision of two black holes starting from the ''Misner initial data,'' a closed form momentarily stationary solution to the constraint equations with an adjustable closeness parameter μ0. We show here how an electric mixture of approximation methods can provide both an efficient means of determining the time development of the initial data and a good understanding of the physics of the problem. When the Misner data are chosen to correspond to holes initially very close together, a common horizon surrounds both holes and the geometry exterior to the horizon can …

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Knot Polynomial States Of Quantum Gravity In Terms Of Loops And Extended Loops: Some Remarks, Cayetano Di Bartolo, Rodolfo Gambini, Jorge Griego, Jorge Pullin Jan 1995

Knot Polynomial States Of Quantum Gravity In Terms Of Loops And Extended Loops: Some Remarks, Cayetano Di Bartolo, Rodolfo Gambini, Jorge Griego, Jorge Pullin

Faculty Publications

In this paper we review the status of several solutions to all the constraints of quantum gravity that have been proposed in terms of loops and extended loops, based on knot polynomials. We discuss pitfalls of several of the results, and in particular the issues of covariance and regularization of the constraints in terms of extended loops. We also propose a formalism for "thickened out loops," which does not face the covariance problems of extended loops and may allow to regularize expressions in a consistent manner. © 1995 American Institute of Physics.

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Modules Associated To Disconnected Surfaces By Quantization Functors., Basinyi Chimitza Jan 1995

Modules Associated To Disconnected Surfaces By Quantization Functors., Basinyi Chimitza

LSU Historical Dissertations and Theses

Blanchet, Habegger, Masbaum and Vogel defined a quantization functor on a category whose objects are oriented closed surfaces together with a collection of colored banded points and $p\sb1$-structure. The functor assigns a module $V\sb{p}(\Sigma)$ to each surface $\Sigma$. This assignment satisfies certain axioms. For p even, it satisfies the tensor product axiom, which gives the modules associated to a disconnected surface as the tensor-product of the modules associated to its components. In this dissertation we show that the p odd case satisfies a generalized tensor product formula. The notion of a generalized tensor product formula is due to Blanchet, and …

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Differential Item Functioning In Performance Assessments: A Comparison Of Three Procedures., Hae-Seong Park Jan 1995

Differential Item Functioning In Performance Assessments: A Comparison Of Three Procedures., Hae-Seong Park

LSU Historical Dissertations and Theses

As performance assessments grow in popularity, it becomes increasingly important to investigate the effect of such assessments on various population subgroups. The purpose of this study was to investigate the relative empirical power of three popular statistical procedures (an extension of the generalized Mantel-Haenszel procedure, Logistic Discriminant Function Analysis, and a combined t-test procedure) in identifying polytomously scored items that function differentially for two subgroups of examinees. In the Monte Carlo study computer simulations were conducted to study the behavior of these procedures for identifying items exhibiting varying degrees of differential-item functioning (DIF). Each statistic was converted to a probability …

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Remediation Of Contaminated Soils Using A Plant Based Surfactant., Raghava Rao Kommalapati Jan 1995

Remediation Of Contaminated Soils Using A Plant Based Surfactant., Raghava Rao Kommalapati

LSU Historical Dissertations and Theses

A plant based surfactant extracted from fruit pericarps of Sapindus mukurossi (Ritha) is employed for the first time to investigate remediation of contaminated soils. A method for preparing natural surfactant solutions was developed and the solutions were characterized followed by generation and characterization of colloidal gas aphron (CGA) suspensions produced with these solutions. The variation of hexachlorobenzene (HCB) solubility with natural surfactant solutions was estimated and desorption of HCB from soils was investigated with batch and on-dimensional column experiments. Bioenhancement of soil microorganisms in natural surfactant solutions was studied under both aerobic and anaerobic conditions. The empirical formula for natural …

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Mathematical Problems In Elasticity And Quantum Mechanics., Genbao Shi Jan 1995

Mathematical Problems In Elasticity And Quantum Mechanics., Genbao Shi

LSU Historical Dissertations and Theses

This thesis is concerned with new mathematical contributions to this area of mathematical physics. It consists of two parts. The first part discusses Pauli uniqueness problem in the content of locally compact abelian groups. We get improved results for $R\sp{n}$, new results for $T\sp{n}$ and $Z\sb{n}$. In the second part which is the main part of the thesis, we develop a new approach to the scattering for Nth order factored equations based on an abstract version of d'Alembert's formula. We show that the asymptotic equivalence (or scattering theory) of the pair of higher order factored equations reduces to the asymptotic …

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Study Of Two Instrumental Variable Methods For Closed-Loop Multivariable System Identification., Jeannette Santos-Cordero Jan 1995

Study Of Two Instrumental Variable Methods For Closed-Loop Multivariable System Identification., Jeannette Santos-Cordero

LSU Historical Dissertations and Theses

New control strategies are based on the model of the process and it is thus necessary to identify the systems to be controlled. It is also often necessary to identify them during closed-loop operation in order to maintain efficient operation and product quality. Some results of multivariable closed-loop identification carried out on a simulated 2 x 2 linear time-invariant system, using two new versions of instrumental variable methods called IV4D and IV4UP as the identification methods, are presented. In each case pseudorandom binary signals (PRBS), or dithers, are applied to the outputs of the feedback controllers. Algorithms IV4D and IV4UP …

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Development Of An Optimal Systems Criteria In The Performance Evaluation Of A Crawfish Sorting Machine., Rommel Gaac Tangonan Jan 1995

Development Of An Optimal Systems Criteria In The Performance Evaluation Of A Crawfish Sorting Machine., Rommel Gaac Tangonan

LSU Historical Dissertations and Theses

This study aimed to: (1) establish a set of optimally configured guidelines for performance testing of crawfish sorting machines; (2) examine biophysical characteristics of crawfish and machine-related design parameters; and, (3) write computer programs covering the essential aspects of the crawfish sorting process. Three crawfish sorting machines were tested in the Spring of 1994 and 1995: (1) cylindrical roller sorter machine, (2) diverging vane belt sorter machine, and (3) grid shaker sorter machine. Both the cylindrical roller sorter and the diverging vane belt sorter separated crawfish into four groups: peeler, medium, large and jumbo; the grid shaker sorter, however, separated …

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The Effects Of Shear Stress On The Crystallization Kinetics Of Syndiotactic Polystyrene., Douglas Henry Krzystowczyk Jan 1995

The Effects Of Shear Stress On The Crystallization Kinetics Of Syndiotactic Polystyrene., Douglas Henry Krzystowczyk

LSU Historical Dissertations and Theses

Industrial polymer processes involve the application of heat and stress, often resulting in deformations at high shear rates and molecular orientation. This affects both the crystallization rates and the melting temperature of semi-crystalline polymers. Knowledge of the variance of these properties are vital commercially due to their effect on processing techniques, production rates and mechanical properties. An experimental apparatus was designed and constructed that allowed the study of the effects of shear on syndiotactic polystyrene melt samples. This apparatus consisted of a parallel plate rheometer that used changes in shear stress, as well as infrared detection equipment that utilized changes …

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Factors Influencing The Intention To Choose A Physical Or An Applied Science Track In College: A Ghanaian District-Level Study., James Adu Opare Jan 1995

Factors Influencing The Intention To Choose A Physical Or An Applied Science Track In College: A Ghanaian District-Level Study., James Adu Opare

LSU Historical Dissertations and Theses

The purpose of the study was to identify the determinants of Ghanaian senior secondary school students' intentions to choose their college majors from the physical and applied sciences. The specific objectives were, first, to find out if males and females are equally likely to major in the physical and applied sciences, and second, to find out if the sex composition of the school a student attends can have an influence on his or her inclination toward the subjects in question. Through paper-and-pencil questionnaires, data for the study were collected in summer 1994, from a sample of 624 12th graders drawn …

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Link Theory: Applications To Real Algebraic Curves., Stephen Patrick Paris Jan 1995

Link Theory: Applications To Real Algebraic Curves., Stephen Patrick Paris

LSU Historical Dissertations and Theses

Hilbert in his sixteenth problem asks us to study the topology of real algebraic varieties. There are many equalities, inequalities, and congruences associated to a real algebraic curve. Extremal properties have been derived for many of the inequalities. In 1980, V. A. Rokhlin derived two inequalities associated to a real algebraic curve. In this dissertation we use methods developed by P. Gilmer to rederive Rokhlin's inequalities. Using these methods we then derive an extremal property for one of the inequalities. Although this extremal property was not studied by Rokhlin, we also show that Rokhlin's ideas can be utilized to prove …

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Factors Influencing The Selection Of Business Majors As Perceived By Transfer And Non-Transfer Business Students., Norma Jeanne Jenkins Soileau Jan 1995

Factors Influencing The Selection Of Business Majors As Perceived By Transfer And Non-Transfer Business Students., Norma Jeanne Jenkins Soileau

LSU Historical Dissertations and Theses

The objectives of this study were to: (1) describe the students enrolled in the two-year business programs offered by state colleges and universities in Louisiana on selected demographic characteristics, (2) compare the students declaring transfer and non transfer majors in two-year business programs on selected demographic characteristics, (3) determine the influence of selected factors on the selection of a two-year business major, (4) determine the desirability of two-year business majors as perceived by students enrolled in Louisiana colleges and universities, which offer two-year business programs, and (5) determine the perceptions of students enrolled in Louisiana colleges and universities on selected …

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On Some Problems In The Algebraic Theory Of Quadratic Forms., Hamza Y. Ahmad Jan 1995

On Some Problems In The Algebraic Theory Of Quadratic Forms., Hamza Y. Ahmad

LSU Historical Dissertations and Theses

This work consists of results on three questions in the algebraic theory of forms. The first question deals with characterizing the Witt kernel (i.e. the anisotropic non-singular quadratic forms over that become hyperbolic) over a given field extension. For separable quadratic and bi-quadratic extension this is well known (for example see (B1, 4.2 and 4.3), (B2, p. 121), (L, p. 200), (ELW, 2.12)). In chapter 2, we provide answers to this question for inseparable quadratic and bi-quadratic extensions. We provide theorem 2.1.5, which in particular answers question 4.4 in (B2). From this result we prove the excellence property for inseparable …

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Counting On You: The Rhetoric Of The National Council Of Teachers Of Mathematics "Standards"., Michael R. Dreher Jan 1995

Counting On You: The Rhetoric Of The National Council Of Teachers Of Mathematics "Standards"., Michael R. Dreher

LSU Historical Dissertations and Theses

This study sought to initiate the process of identifying the rhetoric of mathematics as a distinct field of research, while acknowledging its basis in the rhetoric of science and other literatures. Accordingly, the study started by examining the external basis of the rhetoric of mathematics; in other words, how discourse affects the way in which the culture views mathematics. The primary text for this study was the National Council of Teachers of Mathematics' three-volume Standards for School Mathematics. This document, designed to reform mathematics education from kindergarten through twelfth grade, was shown not to be completely successful in its goal …

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Arsenic Characterization In Soil And Arsenic Effects On Canola Growth., Michael Scott Cox Jan 1995

Arsenic Characterization In Soil And Arsenic Effects On Canola Growth., Michael Scott Cox

LSU Historical Dissertations and Theses

Reactions of soil arsenic with arsenic addition and the effects of soil arsenic on canola were studied because of a lack of information on this subject. The reactions of different pools of soil arsenic to arsenic addition were studied. The effects of soil arsenic and arsenic form and concentration in solution on canola growth and nutrient uptake were also investigated and an attempt to model arsenic uptake with a mechanistic computer model was made. In a solution study, rate of inorganic arsenic did not appear to effect arsenic accumulation in roots and shoots of canola. However, shoot and root arsenic …

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The Determination Of A Matroid's Structure From Properties Of Certain Large Minors., Allan Donald Mills Jan 1995

The Determination Of A Matroid's Structure From Properties Of Certain Large Minors., Allan Donald Mills

LSU Historical Dissertations and Theses

This dissertation solves some problems related to the structure of matroids. In Chapter 2, we prove that if M and N are distinct connected matroids on a common ground set E, where $\vert E\vert \ge 2,$ and, for every e in $E,\ M\\ e = N\\ e$ or M/e = N/e, then one of M and N is a relaxation of the other. In addition, we determine the matroids M and N on a common ground set E such that, for every pair of elements $\{ e,f\}$ of E, at least two of the four corresponding minors of M and …

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Multiplicities And Transforms Of Ideals., Juan Antonio Nido Valencia Jan 1995

Multiplicities And Transforms Of Ideals., Juan Antonio Nido Valencia

LSU Historical Dissertations and Theses

Let (R, M$\sb{\rm R})$ be a regular local ring of dimension 3 of the form k (x,y,z) $\sb{\rm (x,y,z)},$ where k is an algebraically closed field and let I be an M$\sb{\rm R}$-primary ideal that admits generators. We prove that if I$\sb1$ is the proper transform of I to a quadratic transform (A, M$\sb{\rm A})$ of(R, M$\sb{\rm R})$ such that the analytic spread of I$\sb1$ is 3 and the generators of I$\sb1$ induced by those of I satisfy certain divisibility conditions, then the inequality of multiplicities$$\rm e\sb{A}(M(I\sb1)) < e\sb{R}(I)$$is valid, where M $\rm(I\sb1) \supseteq I\sb1$ is an M$\sb{\rm A}$-primary ideal associated to I$\sb1$ (the ideal I$\sb1$ may not be M$\sb{\rm A}$-primary if dim (R) = 3) through an operation M that we define for ideals in a regular local ring.

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Changes Of Antioxidants And Fatty Acid Composition In Stabilized Rice Bran During Storage., Taisun Shin Jan 1995

Changes Of Antioxidants And Fatty Acid Composition In Stabilized Rice Bran During Storage., Taisun Shin

LSU Historical Dissertations and Theses

The effects of extrusion temperature and post extrusion holding time, microwave heating, and gamma irradiation on antioxidants and lipid composition in rice bran were studied. Post extrusion holding time had no apparent effect on rice bran stability. Increased holding times reduced (p $<$ 0.05) total vitamin E. Oryzanol concentration was lower (p $<$ 0.05) only with 6 min holding time. Inactivation of lipolytic enzymes was obtained by extrusion temperatures of 120, 130, and 140$\sp\circ$C. Increased extrusion temperatures reduced the retention of vitamin E and oryzanol during storage. An extrusion temperature of 110$\sp\circ$C provided the highest retention of vitamin E and oryzanol during storage although FFA level was higher (p $<$ 0.05) than that of the other extrusion temperatures from 105 to 375 days. There were no significant (p $>$ 0.05) decreases in individual vitamin E vitamers until 4 min microwave heating. After 8 min heating, individual E vitamers decreased significantly (p $$ 0.05) in FFA level by 24 weeks of storage with microwave heating for 12 min. Microwave heating for 4, 8, and 12 min did not provided adequate inactivation of lipolytic enzymes. Total vitamin …

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A Study Of The Relationship Among Teacher, Process, And Outcome Variables Within School-Based Consultation., Katherine Frances Wickstrom Jan 1995

A Study Of The Relationship Among Teacher, Process, And Outcome Variables Within School-Based Consultation., Katherine Frances Wickstrom

LSU Historical Dissertations and Theses

This study investigated the relationship among several teacher, process, and outcome variables within school-based consultation. A total of 32 consultant-consultee dyads participated in the study until completion of a problem identification interview, a problem analysis interview, and a follow-up session. Four types of data were collected. First, sessions were tape recorded and coded to examine the effect of an "expert" versus a "collaborative" interaction style. Second, teachers completed paper and pencil measures pertaining to (a) attributions of child behavior, (b) preferred service delivery, (c) severity of behavior problem, (d) consultant verbal interactions, (e) treatment acceptability, and (f) teacher satisfaction. Third, …

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Locally Generated Semigroups., Genaro Segundo Gonzalez Jan 1995

Locally Generated Semigroups., Genaro Segundo Gonzalez

LSU Historical Dissertations and Theses

For a topological semigroup S, Lawson constructed a semigroup $\Gamma(S)$ with the property that any local homomorphism defined in a neighborhood of the identity of S to a topological semigroup T extends uniquely to a global homomorphism defined on $\Gamma(S).$ In this work we obtain conditions on S to topologize the semigroup $\Gamma(S)$ via an uniformity such that the extended homomorphism is continuous and such that $\Gamma(S)$ is a topological semigroup. We also investigate a different approach of the problem via the relatively free semigroup RF(U) where U is a suitable neighborhood of the identity of S and show that …

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Using Drawing Tasks To Communicate Ideas About Photosynthesis: A Conceptual Change Strategy For Use In The Elementary School Classroom., Byron Levy Launey Jan 1995

Using Drawing Tasks To Communicate Ideas About Photosynthesis: A Conceptual Change Strategy For Use In The Elementary School Classroom., Byron Levy Launey

LSU Historical Dissertations and Theses

It is difficult for a teacher to determine if a learner has acquired an accurate concept of the topic being taught. Most of the children in this study had sufficient language skills to communicate successfully with their teachers even though they held inappropriate concepts of photosynthesis. This study examined the use of drawing tasks to assess children's ideas related to photosynthesis in an elementary-grade classroom. Two research questions guided the study to determine if this strategy was a valid improvement over traditional methods of classroom instruction. The first question asked if elementary-grade students receiving instruction about photosynthesis would acquire and …

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A Two Dimensional Vertically Integrated Moving Boundary Hydrodynamic Model In Curvilinear Coordinates., Vibhas Aravamuthan Jan 1995

A Two Dimensional Vertically Integrated Moving Boundary Hydrodynamic Model In Curvilinear Coordinates., Vibhas Aravamuthan

LSU Historical Dissertations and Theses

A two dimensional, vertically averaged, hydrodynamic mathematical model on an adaptive boundary fitted grid is developed. This model addresses numerous drawbacks in the traditional finite difference models and incorporates such features as moving boundaries due to tidal incursion, and the ability to resolve irregular coastline geometries. A semi-implicit finite difference scheme is developed in order to overcome time step restrictions due to the gravity wave stability criterion. An eulerian-lagrangian formulation is used to solve the hydrodynamic equations on unsteady grid systems. The model is applied to study circulation features in Lake Pontchartrain (a medium sized physical system) and to the …

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