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Finiteness Theorems For Forms Over Number Fields., Jenna Price Carpenter Jan 1989

Finiteness Theorems For Forms Over Number Fields., Jenna Price Carpenter

LSU Historical Dissertations and Theses

In 1932, E. Witt showed how the collection of bilinear forms over a field $E$ can be made into a ring called the Witt ring, $W(E)$, of $E$. Properties of bilinear forms over a field often are reflected in the algebraic properties of its Witt ring. Perlis, Szymiczek, and Conner give criteria for global fields to be Witt equivalent; that is, to have isomorphic Witt rings. We refine these criteria to obtain finite, necessary and sufficient conditions to insure Witt equivalence of number fields. These conditions yield several finiteness statements for forms over number fields. Among them, for a fixed …

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Reality And Knowledge In Voegelin's Political Philosophy. (Volumes I & Ii)., Seung-Hyun Baek Jan 1989

Reality And Knowledge In Voegelin's Political Philosophy. (Volumes I & Ii)., Seung-Hyun Baek

LSU Historical Dissertations and Theses

It is the primary aim of this dissertation to draw attention to Voegelin's political philosophy and to place it at the center of the conduct of political inquiry, by criticizing positivistic political epistemology. Though scientism had become a dominant commitment, it does not provide an appropriate approach to political knowledge. Making reality dependent on methodology, it neglects important political existence, and fails to ask deeper questions about the truth-content political reality. However, there is an extra-spatio-temporal reality, that we can know, albeit imperfectly, and not discovered by the modern scientific methods. By means of the restoration and "retheoretization" of the …

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Interacting Rydberg Channels In Diatomic Molecules., Ning Yi Du Jan 1989

Interacting Rydberg Channels In Diatomic Molecules., Ning Yi Du

LSU Historical Dissertations and Theses

A new model for a class of heteronuclear diatomic molecules is presented. This model readily combines multichannel quantum defect theory (MQDT) with a nonperturbative Fermi-type analysis. Applications to a series of alkali-He dimers, such as CsHe, have shown that this very simple model can give results (e.g. Born-Oppenheimer potential curves) very close to those from more elaborated methods (e.g. $\ell$-dependent pseudopotential method). Applications to heteronuclear rare gas dimers, such as ArXe, give the first detailed interpretation and classification of some of the observed spectra, which are too complicated to be studied by conventional molecular methods. Another MQDT application is also …

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Evaluation And Improvement Of Maintenance Scheduling Techniques., Nat Khemakavat Jan 1989

Evaluation And Improvement Of Maintenance Scheduling Techniques., Nat Khemakavat

LSU Historical Dissertations and Theses

The objective of this research is to evaluate present maintenance scheduling systems and to suggest improvements or alternatives. The widely used priority-based maintenance scheduling system is shown to be inappropriate in a variety of scheduling circumstances. The major reason is the omission of any type of cost consideration. To overcome this shortcoming, a new maintenance scheduling model is proposed. Instead of using work-order priority as the primary scheduling criteria, the new system uses cost as the key scheduling component. That is, maintenance jobs are scheduled with the objective of minimizing total maintenance cost. Maintenance scheduling strategies based on the cost …

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The Treatment Of Thomas Hobbes In Twentieth Century Political Thought., David Randolph Cole Jan 1989

The Treatment Of Thomas Hobbes In Twentieth Century Political Thought., David Randolph Cole

LSU Historical Dissertations and Theses

In the wake of the political upheavals of the twentieth century, political theorists have rediscovered the unsentimental teachings of Thomas Hobbes. Hobbes was a philosopher of order during a period of disorder--the English Civil War. He taught that sovereignty ought to be absolute and unchallengeable, so that order might be preserved. In particular, the sovereign ought to have the power to approve or disapprove political and religious teachings--in effect, to establish an unchallengeable "civil theology." Hobbesian sovereignty might preserve order, but it would also cut off political discussion and debate in summary fashion. In the twentieth century, political theorists have …

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An Empirical Analysis Of The Effects Of Quality Factors On The Price Of Rough Rice In Louisiana., John Frederick Denison Jan 1989

An Empirical Analysis Of The Effects Of Quality Factors On The Price Of Rough Rice In Louisiana., John Frederick Denison

LSU Historical Dissertations and Theses

This dissertation analyzes the effects of quality factors on prices paid producers for long and medium grain rough rice in Louisiana. Rough rice prices, and other information surrounding quality, were collected for the study for the 1986/87 and 1987/88 marketing years from the Louisiana Farm Bureau Marketing Association in Crowley, Louisiana. The relationship between the price of rough rice, and its quality attributes or characteristics, was analyzed in a hedonic price framework. A conceptual model for the Louisiana rough rice market was constructed, and estimated premiums and discounts reported for a set of quality factors believed to influence producer prices. …

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Modeling, Simulation, And Automatic Control For Optimum Drying And Storage Of Rough Rice In A Bin System., Jong Hoon Chung Jan 1989

Modeling, Simulation, And Automatic Control For Optimum Drying And Storage Of Rough Rice In A Bin System., Jong Hoon Chung

LSU Historical Dissertations and Theses

A study on modeling, simulation, and automatic control for optimum drying and storage of rough rice in a farm-bin system was conducted to address some aspects of rice post-harvest technology. Resistance-type moisture sensors and temperature and humidity sensors were evaluated for continuously monitoring the conditions of air and grain. Models to predict rice moisture models during drying and storage were developed. Based on accuracy and predictability, the use of the capacitance-type humidity sensor is recommended over the resistance-type moisture sensor. A pressure drop model of airflow through rough rice was developed to aid in determining the optimum size and type …

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Density Theorems For Reciprocity Equivalences., Thomas Carrere Palfrey Jan 1989

Density Theorems For Reciprocity Equivalences., Thomas Carrere Palfrey

LSU Historical Dissertations and Theses

The author studies reciprocity equivalence and the wild set of a reciprocity equivalence. He proves that if two algebraic number fields K and L are reciprocity equivalent then there exists a reciprocity equivalence between them with an infinite wild set. In particular, there always exists a self-equivalence with an infinite wild set on any algebraic number field. Even though a wild set of an equivalence can be infinite, he proves that its Dirichlet density is always zero. The structure of a reciprocity equivalence is examined. He proves that the bijection on primes determines the group isomorphism on global square classes …

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Dangerousness: Risk Assessment For Violent Behavior., Charles Edward Shaffer Jr Jan 1989

Dangerousness: Risk Assessment For Violent Behavior., Charles Edward Shaffer Jr

LSU Historical Dissertations and Theses

Federal court decisions and state and federal legislation have made the legal concept of dangerousness the predominant criterion in involuntary mental health hospital commitments and in determining the least restrictive custody level in prison inmate custody assignments. However, no adequate consensual definition with empirical methods of measurement exists. Megargee's (1976) definition of dangerousness as the probability of violent behavior was used as the basis for an empirical approach to measuring dangerousness in this study. Recent studies in the literature (Monohan, 1984; Klassen & O'Conner, 1988) suggested that discriminant analysis might be an appropriate methodology for model development. Review of the …

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Cognitive And Affective Outcomes Of Varying Levels Of Structured Collaboration In A Computer-Based Learning Environment., Judith Lavine Repman Jan 1989

Cognitive And Affective Outcomes Of Varying Levels Of Structured Collaboration In A Computer-Based Learning Environment., Judith Lavine Repman

LSU Historical Dissertations and Theses

This study investigated cognitive and affective outcomes resulting from the use of varying levels of structured peer collaboration (unstructured, structured, and structured with training) in a computer-based learning environment. The study was designed to apply research findings showing a positive relationship between giving explanations and achievement into classroom practice. The sample consisted of 190 students enrolled in nine sections of seventh grade social studies at two middle schools in East Baton Rouge Parish, LA. The schools were selected because they contained large percentages of students at-risk of school failure. Intact classes were randomly assigned to receive one of the three …

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An Inservice Training Program In Mathematics For Thai Elementary School Teachers: A Proposed Model., Chiraporn Sirithavee Jan 1989

An Inservice Training Program In Mathematics For Thai Elementary School Teachers: A Proposed Model., Chiraporn Sirithavee

LSU Historical Dissertations and Theses

The purpose of this study was twofold. First, to survey the existing needs of mathematics inservice education for primary school teachers in Thailand. Second, to develop a model for a systematic inservice mathematics education program for primary school teachers in Thailand. The procedure used in gathering data for this study included the review of literature on inservice mathematics education and other related theories, documentary analysis, questionnaire, governmental publications and documents, official correspondence, and input from a Thai Committee of Experts in elementary and mathematics education. The culmination of these data gave direction for the development of a systematic inservice model …

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Factors Associated With The Production Of Export Quality Fruit By Small Banana Farmers Of The Rio Grande Valley, Portland, Jamaica., Terrence W. Thomas Jan 1989

Factors Associated With The Production Of Export Quality Fruit By Small Banana Farmers Of The Rio Grande Valley, Portland, Jamaica., Terrence W. Thomas

LSU Historical Dissertations and Theses

The study was aimed at determining the relationship between two production variables--technology use, and production of export quality fruit--of small banana farmers in the Rio Grande Valley, Jamaica and selected socioeconomic, personal characteristic and opinion variables, assessing the amount of variance in production explained by the latter, and identifying variables that moderate or mediate the relationship between production variables. The target population was 120 farmers selling bananas to a public boxing plant. A random sample of non-banana farmers was used as a cross-validation check to make inferences to all farmers. Farmers were personally interviewed using a pretested schedule. Stepwise multiple …

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The Impact Of Vertebrate Herbivores On Primary Production Of Sagittaria Marshes In The Wax Lake Delta, Atchafalaya Bay, Louisiana., Jenneke Maria Visser Jan 1989

The Impact Of Vertebrate Herbivores On Primary Production Of Sagittaria Marshes In The Wax Lake Delta, Atchafalaya Bay, Louisiana., Jenneke Maria Visser

LSU Historical Dissertations and Theses

Aboveground production of tidal freshwater marshes dominated by Sagittaria latifolia or Sagittaria platyphylla is best estimated with nondestructive techniques. A nondestructive method for estimation of Sagittaria aboveground biomass and production was developed using multiple regression. This technique yielded estimates of aboveground biomass of Sagittaria ranging from 0 to 1875 g/m$\sp2$; harvested aboveground biomass of Sagittaria ranged from 85 to 1356 g/m$\sp2$. Aboveground production was estimated nondestructively on the basis of permanent plots (465-3809 g/m$\sp2$/yr) and destructively on the basis of end-of-season biomass (775-4056 g/m$\sp2$/yr). Destructively estimated belowground production ranged from 233 to 1199 g/m$\sp2$/yr. Aboveground production was positively correlated with …

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Dynamic Models Of The High-Temperature Desulfurization Process In A Fixed-Bed Reactor., Ching-Pin Wang Jan 1989

Dynamic Models Of The High-Temperature Desulfurization Process In A Fixed-Bed Reactor., Ching-Pin Wang

LSU Historical Dissertations and Theses

The widespread adoption of coal-fueled advanced electric power generation systems depends upon the ability to remove H$\sb2$S from the gasifier product. While H$\sb2$S can be removed by traditional wet scrubbing methods, sensible heat is lost, thereby reducing the overall system efficiency. High temperature desulfurization is now possible using newly developed metal oxide sorbents which are capable of reducing the H$\sb2$S concentration to less than 10 ppmv from a laboratory scale fixed-bed reactor using a simulated coal gas. In this study, reactor simulation models capable of describing the high temperature sulfidation and regeneration reactions of metal oxide sorbents in a fixed-bed …

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Land Subsidence And Saltwater Intrusion In Coastal Areas., Song-Kai Yan Jan 1989

Land Subsidence And Saltwater Intrusion In Coastal Areas., Song-Kai Yan

LSU Historical Dissertations and Theses

Land subsidence and saltwater intrusion problems are encountered concurrently or individually in many coastal areas, especially where heavy pumping is exerted. In order to evaluate the extent and progress of these two phenomena in quantity and quality, a two-dimensional model, the STRALAN (Solute $\underline{\rm Tra}$nsport and $\underline{\rm Lan}$d Subsidence) model, is developed to simulate fluid movement, solute transport and land subsidence in a non-homogeneous, anisotropic, compressible and sloping aquifer system. The governing equations of the model, i.e., the fluid mass balance equation, solute mass balance equation and land subsidence equation for confined or unconfined as well as for sloping aquifers …

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Kinetics Of Chromate And Phosphate Sorption By Oxide Minerals And Soils., David S. Burden Jan 1989

Kinetics Of Chromate And Phosphate Sorption By Oxide Minerals And Soils., David S. Burden

LSU Historical Dissertations and Theses

A nonlinear multireaction model was used to describe kinetic retention data sets for chromate, phosphate, arsenate, borate, fluoride, molybdate, selenite, and silicate by goethite, an iron oxide mineral, and selected soils. These data sets were obtained from laboratory batch experiments with time up to 24 h. Either a three-parameter version of the model consisting of one nonlinear reversible and one first order irreversible reaction, or a five-parameter version consisting of two nonlinear reversible and one first order irreversible reactions was capable of predicting anion sorption by goethite. A mechanistic model consistent with the nonlinear multireaction approach was also proposed in …

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An Anisotropic Finite Plasticity Model For Continuum Damage Mechanics., Peter Issa Kattan Jan 1989

An Anisotropic Finite Plasticity Model For Continuum Damage Mechanics., Peter Issa Kattan

LSU Historical Dissertations and Theses

A constitutive model is formulated for anisotropic continuum damage mechanics using first elasticity and then finite strain plasticity. The formulation is given in spatial coordinates (Eulerian reference frame) and incorporates both isotropic and kinematic hardening. The von Mises yield criterion is modified to include the effects of damage through the use of the hypothesis of elastic energy equivalence. A modified elasto-plastic stiffness tensor that includes the effects of damage is derived within the framework of the proposed model. The damage variable used represents average material degradation which reflects the various types of damage at the microscale level like nucleation and …

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A Total Lagrangian Finite Element Analysis For Metal Forming With Application To Metal Extrusion., Mehrdad Foroozesh Jan 1989

A Total Lagrangian Finite Element Analysis For Metal Forming With Application To Metal Extrusion., Mehrdad Foroozesh

LSU Historical Dissertations and Theses

A detailed formulation for finite element analysis of metal forming problems is carried out in this work. It incorporates every aspect of the analysis, including the iterative solution procedures for geometric and material non-linearities, implementation of the material model, and formulation of curved contact boundaries. The finite element formulation is based on a Total Lagrangian approach which by-passes the use of the Jaumann stress rate tensor commonly used in the Updated Lagrangian formulation. The yield model used is of the von Mises type with both kinematic and isotropic hardening and is formulated in the Eulerian space. This model is then …

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Geometric Modeling And Recognition Of Elongated Regions In Images., Charles Anthony Lipari Ii Jan 1989

Geometric Modeling And Recognition Of Elongated Regions In Images., Charles Anthony Lipari Ii

LSU Historical Dissertations and Theses

The goal of this research is the recovery of elongated shapes from patterns of local features extracted from images. A generic geometric model-based approach is developed based on general concepts of 2-d form and structure. This is an intermediate-level analysis that is computed from groupings and decompositions of related low-level features. Axial representations are used to describe the shapes of image objects having the property of elongatedness. Curve-fitting is shown to compute axial sequences of the points in an elongated cluster. Script-clustering is performed about a parametric smooth curve to extract elongated partitions of the data incorporating constraints of point …

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Fine Scale Velocity Measurements In A Turbulent Jet In A Confined Crossflow., Julie Ann Mathis Jan 1989

Fine Scale Velocity Measurements In A Turbulent Jet In A Confined Crossflow., Julie Ann Mathis

LSU Historical Dissertations and Theses

Measurements of the fine scale velocity field are made for a turbulent jet in a confined crossflow. With a crossflow velocity of 10.0 m/sec, jet-to-crossflow velocity ratios of 1, 2 and 4 are examined. Velocity measurements are obtained by laser velocimetry. The velocimetry system consists of a 15mW laser with a fringe mode optics setup, operated in the backscatter mode. Signal processing is accomplished with a tracker processer. At each measuring location, 28,400 velocity readings are obtained at a sampling frequency of 38,460 sec$\sp{-1}$. Calculations include construction of autocorrelation functions, Kolmogorov-normalized energy spectra and their moments, skewness and flatness of …

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L(P) Regularity And Extrapolation., Michael Helmuth Ruge Jan 1989

L(P) Regularity And Extrapolation., Michael Helmuth Ruge

LSU Historical Dissertations and Theses

The goal of this thesis was to isolate classes of bounded linear operators in $L\sb{p}(I)$ which on the one hand still have some of the well-known and useful properties of positive operators, but which on the other hand are large enough to include some important classes of operators (e.g. the Hilbert transform and the singular operators derived from it) that cannot be dominated by positive operators. In Chapter I, we study as a first class of this kind the $L\sb{p}$ regular operators. By definition such operators map equiintegrable sets in $L\sb{p}(I)$ into equiintegrable sets in $L\sb{p}(I)$ and sets compact in …

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Spectroscopic Studies Of Biological And Synthetic Tetranuclear Iron-Sulfur Clusters., Yvonne Amalia Onate Jan 1989

Spectroscopic Studies Of Biological And Synthetic Tetranuclear Iron-Sulfur Clusters., Yvonne Amalia Onate

LSU Historical Dissertations and Theses

Room-temperature UV-visible adsorption, low-temperature magnetic circular dichroism (MCD), electron paramagnetic resonance (EPR), and resonance Raman (RR) spectroscopies have been used to characterize the electronic, magnetic and structural properties of the (4Fe-4S) centers in Azotobacter vinelandii Fe proteins from Mo- and V-nitrogenases (Av2 and Av2$\sp\prime$, respectively), and Bacillus subtilis glutamine phosphoribosylpyrophosphate amidotransferase. These studies have characterized the S = 1/2 and S = 3/2 forms of the (4Fe-4S) $\sp{1+}$ cluster in native Av2 and Av2$\sp\prime$ in the presence and absence of the protein unfold agent urea, glassing solvents, such as ethylene glycol and glycerol, and nucleotides, such as ATP. The results …

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Natural Convection Above Heated Inclined Surfaces., John Anthony King Jan 1989

Natural Convection Above Heated Inclined Surfaces., John Anthony King

LSU Historical Dissertations and Theses

Motivated by a need to assess pollutant transport by upslope flows, an investigation has been conducted into the fundamentals of natural convection flow over inclined surfaces. Particular attention was focused on the influence of ambient fluid stability. Field studies were performed using tracer gas releases into the upslope flow over a Southern California mountain range. The field studies served to reveal the presence of a split slope flow recirculation and demonstrated the impact of this recirculation on the transport of pollutants from a valley. In order to pursue a controlled investigation of the phenomena found in the field work, a …

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The Effect Of Teaching Upon The Biology Content Cognitive Structure Of Teachers., Patricia Lynn Hauslein Jan 1989

The Effect Of Teaching Upon The Biology Content Cognitive Structure Of Teachers., Patricia Lynn Hauslein

LSU Historical Dissertations and Theses

The Instrument for Free Sorting of Biology Concepts was used to assess understanding of the relationships among 37 biology concepts by five groups: (1) Preservice secondary science teachers (PSR) (2) Inservice biology teachers with 1-3 years of teaching experience (NOV). (3) Inservice biology teachers with 5 or more years of experience (EXP). (4) Scientists in any biological science field (e.g., microbiology, botany) (SCI). (5) College seniors majoring in biology (MAJ). Data collected from the F-Sort of Biology concepts were analyzed using Latent Partition Analysis and Alpha Factor Analysis with additional interpretation from multidimensional scaling. The subjects were asked to think …

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A Dynamic Model Of Diverter Operations For Handling Shallow Gas Hazards In Oil And Gas Exploratory Drilling., Otto Luiz Alcantara Santos Jan 1989

A Dynamic Model Of Diverter Operations For Handling Shallow Gas Hazards In Oil And Gas Exploratory Drilling., Otto Luiz Alcantara Santos

LSU Historical Dissertations and Theses

This dissertation presents an experimentally verified numerical simulator to predict dynamic loads imposed on diverter systems during the well unloading following a shallow gas blowout event. Chapter I presents an overview of important aspects of well control and diverter systems. Also in this chapter, the objective of this research is precisely defined. The following chapter reports the latest efforts of the oil industry to provide diverter systems with more reliable designs and operational procedures. In Chapter III, the apparatus and procedures for the experimental work are discussed. Nine experimental runs have been conducted and the results are reported in a …

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Leader Behavior, Organizational Effectiveness And Job Satisfaction Of Vocational Teachers In Malaysia., Ahmad Mohammad Sharif Jan 1989

Leader Behavior, Organizational Effectiveness And Job Satisfaction Of Vocational Teachers In Malaysia., Ahmad Mohammad Sharif

LSU Historical Dissertations and Theses

The purposes of this study were to identify the relationships of the perceptions of both leader behavior and organizational effectiveness to the job satisfaction of vocational teachers in vocational schools in Malaysia. Nine social and demographic characteristics of respondents were also investigated. The study was also aimed at determining the relative influence of the selected factors on the job satisfaction of respondents. A simple random sample of 250 teachers was selected, of whom 225 responded. The Minnesota Satisfaction Questionnaire (MSQ) - long form was used to measure job satisfaction, while the Leader Behavior Description Questionnaire and the Index of Perceived …

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A Comprehensive Methodology For Algorithm Characterization, Regularization And Mapping Into Optimal Vlsi Arrays., Hassan Reda Barada Jan 1989

A Comprehensive Methodology For Algorithm Characterization, Regularization And Mapping Into Optimal Vlsi Arrays., Hassan Reda Barada

LSU Historical Dissertations and Theses

This dissertation provides a fairly comprehensive treatment of a broad class of algorithms as it pertains to systolic implementation. We describe some formal algorithmic transformations that can be utilized to map regular and some irregular compute-bound algorithms into the best fit time-optimal systolic architectures. The resulted architectures can be one-dimensional, two-dimensional, three-dimensional or nonplanar. The methodology detailed in the dissertation employs, like other methods, the concept of dependence vector to order, in space and time, the index points representing the algorithm. However, by differentiating between two types of dependence vectors, the ordering procedure is allowed to be flexible and time …

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An Experimental And Computational Investigation Of Turbulent Jet Impingement In A Confined Crossflow., Keun Sun Chang Jan 1989

An Experimental And Computational Investigation Of Turbulent Jet Impingement In A Confined Crossflow., Keun Sun Chang

LSU Historical Dissertations and Theses

An experimental and computational investigation is made for the turbulent flow field generated by a jet discharging transversely into a confined moving stream. For jet to cross flow mean velocity ratios (R) equal to 2 and 4, measurements are made using a laser-Doppler velocimeter (LDV) in conjunction with a tracker processor. Quantities measured include mean velocities, turbulence intensities, turbulent shear stress, and dissipation rates of the turbulent kinetic energy. The jet flow Reynolds numbers investigated are 1.5 $\times$ 10$\sp4$ for R = 2 and 3.0 $\times$ 10$\sp4$ for R = 4. The structured nature of the turbulent flow field is …

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Genotype-By-Environment Interactions, Stability Across Environments, And Tolerance To Low Soil Fertility Of Wheat In Louisiana., Jalaluddin Jan 1989

Genotype-By-Environment Interactions, Stability Across Environments, And Tolerance To Low Soil Fertility Of Wheat In Louisiana., Jalaluddin

LSU Historical Dissertations and Theses

Genotypic stability of performance across environments in general, or across levels of a specific environmental factor in particular, is an important concern of plant breeders. The objectives of this research were to examine the relationships and repeatability of the commonly used stability statistics, the relative merits of these statistics in the stability analyses of wheat (Triticum aestivum L.) yield and test weight, and the relationship of genotypic tolerance to low soil-fertility with yield stability. Yield and test weight data of the Louisiana Agricultural Experiment Station (LAES) winter wheat performance trials from 37 year-location combinations were used in the stability analyses. …

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New Learning And Control Algorithms For Neural Networks., Chung Hwa Youn Jan 1989

New Learning And Control Algorithms For Neural Networks., Chung Hwa Youn

LSU Historical Dissertations and Theses

Neural networks offer distributed processing power, error correcting capability and structural simplicity of the basic computing element. Neural networks have been found to be attractive for applications such as associative memory, robotics, image processing, speech understanding and optimization. Neural networks are self-adaptive systems that try to configure themselves to store new information. This dissertation investigates two approaches to improve performance: better learning and supervisory control. A new learning algorithm called the Correlation Continuous Unlearning (CCU) algorithm is presented. It is based on the idea of removing undesirable information that is encountered during the learning period. The control methods proposed in …

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