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A Neural Network Truth Maintenance System., Suresh Guddanti Jan 1991

A Neural Network Truth Maintenance System., Suresh Guddanti

LSU Historical Dissertations and Theses

A novel approach using Neural Networks has been developed to generate consistent labelling of facts in relation to a given set of rules. In the proposed system, facts are represented by neurons and their interconnections form the knowledge base. The Neural Network Truth Maintenance System(TMS) arrives at a valid solution provided the solution exists. A valid solution is a consistent labelling of facts. If a valid solution does not exist the network does not converge. An experimental setup was built and tested using conventional integrated circuits. The hardware design is suitable for VLSI implementation for large, real-time problems. The TMS …

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The College Participation Of The 1982 Undergraduate Cohort In Louisiana Public Higher Education: A Longitudinal Analysis., Margaret Blanchard Hargroder Jan 1991

The College Participation Of The 1982 Undergraduate Cohort In Louisiana Public Higher Education: A Longitudinal Analysis., Margaret Blanchard Hargroder

LSU Historical Dissertations and Theses

This study examined the six-year college participation of students entering Louisiana public undergraduate higher education in Fall 1982. Motivation for the study stemmed from several educational conditions in Louisiana: a lower graduation rate than that of the nation, disparities in the graduation rates of Black students and White students, and administrative considerations for the restructuring of public higher education. The purposes of the study were: (1) to describe the population by selected characteristics and (2) to identify participation differences in enrollment, persistence, and achievement among sub-groups classified by: (a) race and gender, (b) developmental program participation, and (c) institutional types …

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Effective School Status: A Methodological Study Of Classification Consistency., Michael Hansen Lang Jan 1991

Effective School Status: A Methodological Study Of Classification Consistency., Michael Hansen Lang

LSU Historical Dissertations and Theses

This study investigated both the effect of alternating criterion-referenced tests (CRT) with norm-referenced tests (NRT) in evaluating schools and whether mean scores were masking poor delivery of educational services to low achievers in such evaluations. The sample included 242 Louisiana public elementary schools (18,000 third graders tested in 1989). The study employed ten separate multiple regression models, each producing studentized residuals used as school effectiveness indicators (SEIs). The independent variables for all models were student's free lunch status, mother's educational level, and father's employment level. The dependent variables were school mean and lower quartile scores for CRT language arts and …

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On The Construction And Application Of Certain Special Polarizations In Nilpotent Lie Algebras., James Donald Moss Jr Jan 1991

On The Construction And Application Of Certain Special Polarizations In Nilpotent Lie Algebras., James Donald Moss Jr

LSU Historical Dissertations and Theses

This dissertation arose from efforts to prove the following conjecture, which generalizes to nilpotent Lie groups a weak form of the classical Paley-Wiener theorem for $\IR\sp{n}$: Let N be any connected, simply connected nilpotent Lie group with unitary dual N, and let $\varphi\in L\sbsp{c}{\infty}(N)$. Suppose that there exists a subset E $\subset$ N of positive Plancherel measure such that $\\varphi(\pi)$ = 0 for all $\pi\in$ E, where $\\varphi(\pi)$ is the operator-valued Fourier transform of $\varphi$. Then $\varphi$ = 0 almost everywhere on N. The writer has been able to prove a slightly weakened form of the conjecture for a large …

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Family Support For Persisters And Non-Persisters In Louisiana's Adult Basic Education Programs., Geraldine Hargrove Holmes Jan 1991

Family Support For Persisters And Non-Persisters In Louisiana's Adult Basic Education Programs., Geraldine Hargrove Holmes

LSU Historical Dissertations and Theses

The role that family involvement and the effects of home efforts have on improved student achievement for children is well documented in the literature. The purpose of this study was to determine whether family support should be considered when planning adult basic education (ABE) programs. The objectives addressed were: demographic characteristics, level of family support, and relationship of family support among selected variables. A statewide random sample of 197 adult basic education students was surveyed (82.7% response rate). Persisters (students who either completed the ABE program or were continuing their instruction when the study was conducted) and non-persisters (students who …

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An Analysis Of Syntactic Skills Used In Translating Natural Language Sentences Into Algebraic Equations., Elizabeth Devalcourt Gray Jan 1991

An Analysis Of Syntactic Skills Used In Translating Natural Language Sentences Into Algebraic Equations., Elizabeth Devalcourt Gray

LSU Historical Dissertations and Theses

The purpose of this study is to determine how a competent person translates a natural language sentence into an algebraic equation. A current theory of how translation occurs is espoused by a group of cognitive scientists who propose that the competent translator uses only conceptual strategies in the translation process. I propose and investigate an alternate theory that the translation skills of a competent student are based on a syntactic analysis and syntactic manipulation of the sentence. In most cases such direct, syntactic translation processes will suffice, but for a small minority of sentence types a decision must be made …

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Specific Cell Adhesion And Its Application In Mixed Culture Fermentations., Yeou-Fu Hwang Jan 1991

Specific Cell Adhesion And Its Application In Mixed Culture Fermentations., Yeou-Fu Hwang

LSU Historical Dissertations and Theses

Cell adhesion mediated by bonds between receptors in the cell membrane and ligands on a solid support is referred to as specific cell adhesion. This work focused on the application of specific cell adhesion in control of mixed culture fermentations and on the development of solution methods of mathematical models for cell adhesion. Through various experimental techniques, a model two-strain mixed culture system was obtained. This system was used to explore the possibility of mixed culture control through selective adhesion of particular subpopulations. It was found that through a proper reactor design and operating procedure, the coexistence of the mixed …

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Genotype X Environment Interaction For Growth And Reproductive Traits In Beef Cattle., Louis Munyakazi Jan 1991

Genotype X Environment Interaction For Growth And Reproductive Traits In Beef Cattle., Louis Munyakazi

LSU Historical Dissertations and Theses

Data on eight different two breed combinations of calves produced in two locations (Louisiana and Nebraska) were analyzed to determine the magnitude of genotype x location interactions for gestation length (GESTLEN), birth weight (BWT), pre-weaning average daily gain (ADG) and weaning weight (WWT). Sire breed (SB), sire/SB and cow breed (CB) interactions with location (LOC) were the primary sources of variation of interest in the analysis of variance. The SB x LOC interaction was significant for all traits whereas the CB x LOC interaction was important only for ADG. The sire/SB x LOC interaction accounted for a significant amount of …

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Biological Treatment Of Hazardous Waste Sludges In Suspended Growth Systems For Removal Of Benzo(A)Pyrene And Other Polynuclear Aromatics., Robert E. Marks Jan 1991

Biological Treatment Of Hazardous Waste Sludges In Suspended Growth Systems For Removal Of Benzo(A)Pyrene And Other Polynuclear Aromatics., Robert E. Marks

LSU Historical Dissertations and Theses

The scope of this research project was to develop a bioremediation process for accelerated oxidation of bioresistant hazardous waste sludges in continuous flow sludge reactors. Benzo(a)pyrene (BaP) was selected as the target compound due its strong bioresistance, highly carcinogenic nature, extremely low aqueous solubility, and extremely low allowable release limits for land disposal. BaP is often a major hazardous organic component in many hazardous waste impoundments when source wastes have originated from either petroleum refining or associated petrochemical facilities. There is evidence that the biodegradation rate of high molecular weight polynuclear aromatic hydrocarbons (PNA's) is the rate limiting step in …

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Modeling The Effect Of Shale Heterogeneities On Hazardous Waste Transport In Deep Well Disposal Systems., Seung-Whee Rhee Jan 1991

Modeling The Effect Of Shale Heterogeneities On Hazardous Waste Transport In Deep Well Disposal Systems., Seung-Whee Rhee

LSU Historical Dissertations and Theses

The transport of hazardous wastes in heterogeneous confining layers was evaluated using numerical simulations. The expected configuration of the confining layers was defined by Monte Carlo techniques assuming a binary random structure composed of pure sand and pure shale zones. Flow and solute transport in the generated configuration was determined via a finite element model. The effective permeability under saturated steady-state flow was dominated by shale permeability for higher shale fractions ($>$0.65) and by sand permeability for lower shale fraction ($<$0.4). The results agreed well with the numerical result of Desbarats (1987) and the analytical results of Dagan (1979). The effective vertical permeabilities were found to be dependent on shale size and anisotropy. Application of the techniques to a well in Jefferson Parish, Louisiana suggested that a mean advective penetration into confining layer using the injection pressure as an upper bound to the driving pressure was only 3m over 10,000 years. Transport calculations assuming a constant pressure driving force over 10,000 years suggested solute transport was controlled by hydrodynamic dispersion (dispersion + diffusion) rather than advection for higher shale fractions. Transport calculations assuming active injection for only the first 100 years suggested solute transport was controlled by diffusion for higher shale fraction. Buoyancy effects associated with salinity and temperature variations were negligible for solute transport through confining layers with a shale permeability less than 0.01 md. The results of solute transport of hazardous wastes in heterogeneous confining layers suggested that confining layers greater than 300 ft in thickness with shale fractions of greater than 0.65 and shale permeabilities of less than 0.01 md would be expected to contain injected wastes for 10,000 years.

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Radial Flow Chromatography In Compressed Pancake-Shaped Beds., Brian Keith Heft Jan 1991

Radial Flow Chromatography In Compressed Pancake-Shaped Beds., Brian Keith Heft

LSU Historical Dissertations and Theses

The separation of a methane/n-butane mixture was demonstrated using radial flow through compressed, pancake-shaped beds of fine alumina powder. The compacted stationary phase improved performance relative to an uncompressed sorbent by assuring flow uniformity through the bed, reducing band-broadening and tailing (by decreasing interstitial hold-up) and decreasing effective plate height (through an increase in the capacity ratio of the chromatograph). Dispersion was identified as the key dissipative effect in the prototype radial flow adsorber. An exact analytical solution derived for the transport equations describing such a device compared favorably with experimental data. The dispersion coefficients were found to be strong …

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Feedback Linearization Of Nonlinear Systems: Robustness And Adaptive Control., Weon Ho Kim Jan 1991

Feedback Linearization Of Nonlinear Systems: Robustness And Adaptive Control., Weon Ho Kim

LSU Historical Dissertations and Theses

Feedback linearization provides an effective means of designing nonlinear control systems. This method permits one to have an exactly equivalent linear system by using a coordinate transformation and state feedback. Once the nonlinear system is transformed to a linear system, one can proceed with well developed control technologies for linear systems. Feedback linearization is based on a model of the real system. If there is mismatch between the model and the real plant, feedback linearization does not yield an exactly linear system. The question of robustness then arises: will a controller based on the model be stable when applied to …

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A New Condition For Arithmetic Equivalence., Donna Joy Stuart Jan 1991

A New Condition For Arithmetic Equivalence., Donna Joy Stuart

LSU Historical Dissertations and Theses

Two algebraic number fields K, K$\sp\prime$ are said to be arithmetically equivalent if every prime number p has the same splitting type in K as in K$\sp\prime$. Many equivalent formulations of arithmetic equivalence are known. The best-known of these is: K and K$\sp\prime$ are arithmetically equivalent if and only if their Dedekind zeta functions coincide. This dissertation provides a surprising new formulation: K and K$\sp\prime$ are arithmetically equivalent if and only if for all prime numbers p, outside a given set of density zero, the number $g\sb K (p)$ of prime factors of p in K is equal to the …

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A New Construction Of Subgroups Inducing Isomorphic Representations., Patricia Wright Beaulieu Jan 1991

A New Construction Of Subgroups Inducing Isomorphic Representations., Patricia Wright Beaulieu

LSU Historical Dissertations and Theses

This dissertation provides a method to construct infinite families of triples ($H\sb{i},H\sbsp{i}{\prime},G\sb{i}$) consisting of two non-conjugate subgroups $H\sb{i}$ and $H\sbsp{i}{\prime}$ of a finite group $G\sb{i}$ whose trivial representations induce isomorphic representations of $G\sb{i}$. Such triples are important in number theory, differential geometry, and group theory.

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Mechanism And Enhancement Of Phase Segregation In Drilling Fluids., John Marvin Griffin Jan 1991

Mechanism And Enhancement Of Phase Segregation In Drilling Fluids., John Marvin Griffin

LSU Historical Dissertations and Theses

Dewaterability of a compressible suspension can be characterized by two fundamental properties of viscoelastic networks: permeability and bulk modulus of elasticity. Time required for dewatering can be obtained from the former, while the latter can furnish the data required for predicting ultimate compaction. A method has been derived and an apparatus constructed for measurement of these two properties in a centrifugal field. The method was applied to a variety of drilling fluids and mineral suspensions. A floor-mounted laboratory centrifuge was used in this investigation. The methods developed have merit for evaluating pre-treatments prior to centrifugal dewatering. A method for quantifying …

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A Study Of Metacognitive Skill As Influenced By Expressive Writing In College Introductory Algebra Classes., Naomi Barbara R Allen Jan 1991

A Study Of Metacognitive Skill As Influenced By Expressive Writing In College Introductory Algebra Classes., Naomi Barbara R Allen

LSU Historical Dissertations and Theses

The quality of mathematics education has become a major concern to mathematics educators. As a result, increased attention is being given to identifying the abilities that underlie competent performance. An outcome of this effort is an increasing belief that the development of metacognitive skills is an essential component of proficient mathematics performance. Writing, because it promotes reflective thinking, is believed to be the vehicle for this development. Writing in the mathematics classroom has previously received anecdotal support for its benefits to the learner and to the instructor, and limited quantitative benefits in problem-solving ability toward mathematics. This study examined the …

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Acquiring Vocabulary In A Foreign Language: Some Effects Of The Nature Of Instruction On The Knowledge And Use Of Words., Louise Stowell-Ruzicka Jan 1991

Acquiring Vocabulary In A Foreign Language: Some Effects Of The Nature Of Instruction On The Knowledge And Use Of Words., Louise Stowell-Ruzicka

LSU Historical Dissertations and Theses

The purpose of this study was to examine the effect that the nature of instruction of French vocabulary words has on student knowledge and use of the words on five different measures: a definition recognition test, a cloze plus word bank test, a comprehension of a text containing the words, a writing assignment designed to elicit free use of these words and a test of overall reading proficiency. Eighty-one high school students in the second year course of French constituted three treatment groups: (1) traditional instruction where students were required to learn a list of 12 words paired with their …

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An Adaptive Differencing Scheme For Elliptic Flows., Therese Estelle Rhodes Jan 1991

An Adaptive Differencing Scheme For Elliptic Flows., Therese Estelle Rhodes

LSU Historical Dissertations and Theses

This thesis deals with the formulation of a computationally efficient multiple-grid adaptive differencing (MAD) scheme for two-dimensional elliptic flow and heat transfer problems. This algorithm equidistributes a measure of the error by using higher order differencing schemes locally in adaptively determined high error-estimate regions. The third-order accurate QUICK scheme is used in regions of high error estimate which are dynamically flagged on the basis of a preliminary first order upwind solution. Boundary conditions for the flagged regions are taken from the preliminary upwind solution. Multigrid type calculations are performed. Three multiple-grid schemes are developed. In the first scheme, MAD1-WFDS, the …

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Statistical Sophistication Of Research In Vocational Education., Chi Zhang Jan 1991

Statistical Sophistication Of Research In Vocational Education., Chi Zhang

LSU Historical Dissertations and Theses

The purpose of this study was to determine the status of, and changes in, the statistical sophistication of research in vocational education in the 1980s. The study also explored relationships among statistical sophistication, problem area studied, and methodological strategy used in vocational education research. Data collected were obtained from 118 quantitative research reports randomly selected from the Journal of Vocational Education Research, the Journal of Agricultural Education, the Journal of Industrial Teacher Education, and the Journal of Vocational Home Economics Education published in the early (1980-1983) and the late 1980s (1986-89). The researcher developed instrument used in this study consisted …

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Three Essays In The Economics Of The Physician Firm, William David Bradford, Iii Dec 1990

Three Essays In The Economics Of The Physician Firm, William David Bradford, Iii

LSU Historical Dissertations and Theses

This dissertation explores three aspects of the physician firm. As such, the current work is concerned with the contribution that quality considerations can make toward our understanding of the medical market. The first of three essays introduces quality into the literature aimed at estimating the supply function of physician firms. This study finds that explicit modeling of quality, both theoretically and empirically, produces results superior to past work in this field and indicates that physicians behave as if they are competitive economic agents. The second essay considers the effect of Medicaid on the behavior of physicians, especially their allocation of …

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Epicomplete Archimedean L-Groups Via A Localic Yosida Theorem, James Madden, J. Vermeer Nov 1990

Epicomplete Archimedean L-Groups Via A Localic Yosida Theorem, James Madden, J. Vermeer

Faculty Publications

No abstract provided.

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On An Excluded-Minor Class Of Matroids, James G. Oxley May 1990

On An Excluded-Minor Class Of Matroids, James G. Oxley

Faculty Publications

A result of Walton and the author establishes that every 3-connected matroid of rank and corank at least three has one of five 6-element rank-3 self-dual matroids as a minor. One of these matroids is the rank-3 whirl W3. Another is the rank-3 matroid P6 that consists of a single 3-point line together with three points off the line. This paper determines the structure of the class of matroids that is obtained by excluding as minors both W3 and P6. As a consequence of this result, we deduce a characterization of the class of GF(4)-representable matroids with no W3-minor. © …

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Faculty Senate Resolution 89-15, Louisiana State University And Agricultural & Mechanical College Apr 1990

Faculty Senate Resolution 89-15, Louisiana State University And Agricultural & Mechanical College

LSU Faculty Senate Publications

Faculty Senate Resolution regarding no credit grades, adopted on April 19, 1990.

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Geology, Volcanology, And Petrology Of Cerro Bravo, A Young, Dactic, Stratovolcano In West-Central Colombia, David Tondl Lescinsky Apr 1990

Geology, Volcanology, And Petrology Of Cerro Bravo, A Young, Dactic, Stratovolcano In West-Central Colombia, David Tondl Lescinsky

LSU Historical Dissertations and Theses

The northernmost active Andean volcano, Cerro Bravo is a small, young, and very explosive stratovolcano. Cerro Bravo has produced voluminous tephra deposits, that are found> 30 km away, as well as, pumice flow deposits, block and ash flow deposits, and high-aspect lava flows, which are found proximally to the volcano. There have been eight episodes of activity during the past 6250±110 years (Herd, 1982), with the most recent <200 years ago and the present being a period of quiescence with no visible activity or thermal manifestations. Stratigraphic relationships suggest the occurrence of an initial explosive phase and a concluding effusive phase of activity during individual episodes. The products of volcanic activity at Cerro Bravo are a chemically and mineralogically monotonous suite of medium-K dacite and high-silica andesite (59.2- 67.5% SiO2 pumices and lavas. The dominant phenocrysts present are plagioclase and hornblende (oxyhomblende in lavas) with lesser quantities of orthopyroxene, titanomagnetite, and rare augite and biotite also present. Petrology and eruption dynamics …

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Utilizing A Network Program Representation To Support Production System Program Development And Execution., Sally Jo Cunningham Jan 1990

Utilizing A Network Program Representation To Support Production System Program Development And Execution., Sally Jo Cunningham

LSU Historical Dissertations and Theses

This dissertation discusses modifications of the internal architecture of production systems that could significantly increase the execution performance of production system programs. This increased efficiency is achieved in part by modifications to the matching step of the execution cycle. Rather than checking all possible instantiations, we propose to consider only a small subset of the potential instantiations which are the "best candidates" for firing (according to the conflict resolution scheme). The increased execution efficiency provided by this matching strategy is compounded by modifying the OPS5 conflict resolution strategies. We propose a goal-directed (look-ahead) conflict resolution strategy which will still retain …

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The Transport And Fate Of Chromium(Vi) In Deep Well Disposal Zone., Jaehyuk Hyun Jan 1990

The Transport And Fate Of Chromium(Vi) In Deep Well Disposal Zone., Jaehyuk Hyun

LSU Historical Dissertations and Theses

Several parameters affecting the behavior of Chromium(+VI) in deep well injection zones were studied. Temperature, pH, concentration of inorganic salt in wastewater, and organic chemicals co-injected with wastewater were considered as they affect the adsorption and reduction rates of Cr(VI). Water content, bulk density of shale and sand, and temperature were examined for their effect on the diffusion rate of Cr(VI) in porous media. Adsorption and reduction of Cr(VI) were investigated using three clays, Na-Montmorillonite, Illite, and Kaolinite, and sand from an injection well formation in southern Louisiana, and a confining layer shale obtained from a second Louisiana injection well. …

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Open And Closed Systems In Data Analysis Entropy., Hamid Reza Jafari Jan 1990

Open And Closed Systems In Data Analysis Entropy., Hamid Reza Jafari

LSU Historical Dissertations and Theses

This dissertation presents an efficient and integrated approach to data analysis. Entropy data analysis is an evolution of reconstructability analysis, which investigates the relationships between parts and wholes. The central theme of the dissertation is the development of a system to condense the information in a data set into a small number of parameters. The new system is called a k-system. k-system analysis goes beyond traditional data analysis in that it has the potentiality for changes to be made to a system; and the impact of these changes can be evaluated. k-system can be useful in designing and evaluating open …

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Diffusivity Estimation For Counterdiffusing Reactants In Catalytic Solids., Chauchyun Chang Jan 1990

Diffusivity Estimation For Counterdiffusing Reactants In Catalytic Solids., Chauchyun Chang

LSU Historical Dissertations and Theses

The diffusivities of molecules whose sizes approach the intracrystalline pore sizes of zeolites have been studied at and near conditions prevailing during catalysis, by both desorption and kinetics techniques. For the desorption approach, a series of unary isothermal desorption experiments (following an almost instantaneous initial temperature rise) were conducted for toluene or benzene with five different zeolites. Diffusion and readsorption are shown to control the process. The intracrystalline diffusivities (D$\sb{\rm e}$) were derived by fitting the desorption curves with four models of varying complexity; only models which take into account readsorption (either at equilibrium or not) can both fit the …

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Predicting Potassium Uptake By White Clover With A Mathematical Model And Assessment Of White Clover Phosphorus And Potassium Status With The Dris., Hubert Joseph Savoy Jr Jan 1990

Predicting Potassium Uptake By White Clover With A Mathematical Model And Assessment Of White Clover Phosphorus And Potassium Status With The Dris., Hubert Joseph Savoy Jr

LSU Historical Dissertations and Theses

Environmental concerns emphasize the requirement for diagnostic tools compatible with more intensively managed agricultural systems. Two recent approaches, the Barber-Cushman mechanistic model and the Diagnosis and Recommendation Integrated System (DRIS), appear to offer more accurate predictions of soil nutrient supply and more flexible means of assessing plant nutrient status, respectively, than conventional methods. The objectives of this research were to verify the aforementioned models for predicting K uptake and assessing P and K status of LA S-1 white clover. In growth chamber experiments, the Barber-Cushman model correctly predicted K uptake by plants for up to 21 days from Rita muck, …

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Continuous Functions In Pi-Primary Summands Of L(2) Of Some Compact Solvmanifolds., Carolyn Beth Pfeffer Jan 1990

Continuous Functions In Pi-Primary Summands Of L(2) Of Some Compact Solvmanifolds., Carolyn Beth Pfeffer

LSU Historical Dissertations and Theses

The compact quotients of three-dimensional solvable non-nilpotent Lie groups by discrete subgroups fall into two categories; those which are quotients of $S\sb{R}$ (semidirect product, R acts on R$\sp2$ by rotation), and those which are quotients of $S\sb{H}$ = $R\ \propto\ R\sp2$ (semidirect product, $R$ acts on $R\sp2$ via translation along a hyperbolic orbit). Continuous functions in the primary summands of $L\sp2$ of each type of solvmanifold are examined. It is shown that there exists a Fejer theorem on solvmanifolds $M\sb{R}$ which are quotients of $S\sb{R}$; if $P\sb{i}$: $L\sp2(M\sb{R})\mapsto$ $L\sp2(M\sb{R})$ is orthogonal projection onto the ith primary summand of such a …

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