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Modeling And Optimal Design Of Spiral-Wound Membrane Systems For Gas Separations., Runhong Qi Jan 1998

Modeling And Optimal Design Of Spiral-Wound Membrane Systems For Gas Separations., Runhong Qi

LSU Historical Dissertations and Theses

Membrane system economics can be significantly affected by process modeling and design. Available spiral-wound permeator models are difficult to use for process design because of their mathematical complexity and high computational demands. Existing sequential design methods yield suboptimal flowsheets when multiple permeation stages are required. In this dissertation, more effective modeling and design techniques for spiral-wound systems separating binary and multicomponent gas mixtures are developed. An approximate modeling approach based on the assumption that the residue flow rate is constant in the direction of bulk permeate flow is proposed. This assumption allows a significant simplification of basic transport models which …

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Facilitating Knowledge Integration And Flexibility: The Effects Of Reflection And Exposure To Alternative Models., Lewis Garnet Roussel Jr Jan 1998

Facilitating Knowledge Integration And Flexibility: The Effects Of Reflection And Exposure To Alternative Models., Lewis Garnet Roussel Jr

LSU Historical Dissertations and Theses

Three experiments investigated the effect of various kinds of reflection (within-task and post-task reflection) on learning a process control task. Also, two ways of providing learners with alternative ideas about task behavior, exposure to other's ideas and providing hints for task solution, were examined. The task involved a simulated "sugar production factory" in which the learners sought to control sugar production by manipulating workforce size. It was predicted that combining within-task reflection with exposure to alternative task ideas would lead to superior task performance through integration of experiential and reflective knowledge. Contrary to the prediction, within-task reflection consistently interfered with …

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Bioremediation Of Petroleum Hydrocarbons In Louisiana's Saltwater Marshes: Sediment Oxygen Demand Model., Won Sik Shin Jan 1998

Bioremediation Of Petroleum Hydrocarbons In Louisiana's Saltwater Marshes: Sediment Oxygen Demand Model., Won Sik Shin

LSU Historical Dissertations and Theses

Laboratory core studies were conducted to determine sediment oxygen demand (SOD) in petroleum hydrocarbon contaminated salt marshes. Natural degradation processes in salt marshes such as aerobic respiration, nitrification and sulfate reduction were investigated to quantify SOD. Oxygen demand in oiled/fertilized cores was greater than control and fertilized cores due to increased oxygen consumption by oil degradation and oxidation of reduced chemicals; sulfide and ammonium. SOD under non-flooded condition was greater than flooded condition due to an increased area of oxic-anoxic interface during air exposure. This may indicate that significant biodegradation of crude oil only occurs when the surface of the …

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Maximal Circuits In Matroids., Pou-Lin Wu Jan 1998

Maximal Circuits In Matroids., Pou-Lin Wu

LSU Historical Dissertations and Theses

Lovasz, Schrijver, and Seymour have shown that if a connected matroid M has a largest circuit of size c and a largest cocircuit of size c*, then M has at most 2c+c*-1 elements. A question of Oxley that has attracted considerable recent attention is whether there is an upper bound on the size of M that is polynomial in terms of c and c*. In particular, Bonin, McNulty, and Reid conjectured that 12cc* is such a bound. In Chapter 1, we prove this conjecture for an connected graphic and cographic matroids. In Chapter 2, we give a constructive description of …

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Teacher Selection Practices In Effective Elementary Schools Which Differ By Community Type And Socioeconomic Status Context., Amy Barham Westbrook Jan 1998

Teacher Selection Practices In Effective Elementary Schools Which Differ By Community Type And Socioeconomic Status Context., Amy Barham Westbrook

LSU Historical Dissertations and Theses

The current study investigated teacher selection in elementary schools which differ by school type, community type, and socioeconomic status (SES). The qualities sought, procedures utilized, and problems encountered by principals during teacher selection were examined. Statistical analyses were used to determine whether school types differ significantly on variables regarding teacher selection. The present study involved collecting both qualitative and quantitative data, and was conducted in four phases. In Phase I, all elementary schools in the state were classified by community type, student body SES, and "effective" and "typical" status. Phase II consisted of 12 site visits to "effective" schools which …

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Association Of Environmental And Climatic Factors In The Epidemiology Of American Visceral Leishmaniasis In Northeast Brazil Using Remote Sensing And Geographical Information System Methods., Roland Alexander Thompson Jan 1998

Association Of Environmental And Climatic Factors In The Epidemiology Of American Visceral Leishmaniasis In Northeast Brazil Using Remote Sensing And Geographical Information System Methods., Roland Alexander Thompson

LSU Historical Dissertations and Theses

This study associated climatic and environmental factors with the incidence of visceral leishmaniasis (calazar) in Northeast Brazil. Remote sensing (RS) techniques permitted evaluation of spatial and temporal landscape features to stratify the region and define the target population for this vector-borne disease. The Municipality of Caninde, Ceara, Brazil was divided into 873-- 2 x 2 km2 squares centered on coordinates from a Universal Transverse Mercator projection (scale 1:100,000, 1994) and geo-referenced with 2 Landsat T.M. (TM) scenes (September 26, 1976 and July 2, 1996). The assignment of squares into foothills, plains or city strata was based on vegetative categories determined …

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An Estimation Of Rough Rice Basis In Southwest Louisiana, G Grant Giesler Jan 1998

An Estimation Of Rough Rice Basis In Southwest Louisiana, G Grant Giesler

LSU Agricultural Experiment Station Reports

No abstract provided.

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Daniel Pratt Of Prattville: A Northern Industrialist And A Southern Town., Curt John Evans Jan 1998

Daniel Pratt Of Prattville: A Northern Industrialist And A Southern Town., Curt John Evans

LSU Historical Dissertations and Theses

This dissertation explores the life of Daniel Pratt, one of the South's most important industrialists. Daniel Pratt was born in Temple, New Hampshire on July 20, 1799. In 1821, he migrated to Jones County, Georgia, where he worked as a carpenter-architect for ten years. He married Esther Ticknor of Connecticut in 1827 Samuel Griswold hired Pratt in 1831 to superintend his cotton gin factory in Jones County. Two years later, Pratt migrated to Autauga County in central Alabama, where he started his own gin shop. In 1839, Pratt founded Prattville, located fourteen miles from Alabama's capital, Montgomery. The next year, …

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Parallelization And Implementation Of Approximate Root Isolation For Nonlinear System By Monte Carlo., Ebrahim Khosravi Jan 1998

Parallelization And Implementation Of Approximate Root Isolation For Nonlinear System By Monte Carlo., Ebrahim Khosravi

LSU Historical Dissertations and Theses

This dissertation solves a fundamental problem of isolating the real roots of nonlinear systems of equations by Monte-Carlo that were published by Bush Jones. This algorithm requires only function values and can be applied readily to complicated systems of transcendental functions. The implementation of this sequential algorithm provides scientists with the means to utilize function analysis in mathematics or other fields of science. The algorithm, however, is so computationally intensive that the system is limited to a very small set of variables, and this will make it unfeasible for large systems of equations. Also a computational technique was needed for …

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Synthesis And Physical Characterization Of Solid-State Materials., Patrick Allen Kolniak Jan 1998

Synthesis And Physical Characterization Of Solid-State Materials., Patrick Allen Kolniak

LSU Historical Dissertations and Theses

Two quantitative X-ray powder diffraction methods were used to analyze Phosphogypsum, a currently underutilized solid by-product of phosphoric acid production. Three kinds of synthetic mixtures were prepared to reflect the variable composition of phosphogypsum: AG (anhydrite and gypsum), QCD (quartz, calcite, and dolomite), and AGQCD. Compositions derived from the Whole Pattern fitting method for the binary and ternary mixtures agreed reasonably well with known values, with residuals $\rm\langle R\sp2\rangle = 0.10$ for eleven AG samples, and $\rm\langle R\sp2\rangle = 0.018$ for thirteen QCD samples. However, in the five-component mixtures, overlap of anhydrite, dolomite and gypsum peaks prevented quantitation. Compositions derived …

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A Universal Parametrization In B-Spline Curve And Surface Interpolation And Its Performance Evaluation., Choong-Gyoo Lim Jan 1998

A Universal Parametrization In B-Spline Curve And Surface Interpolation And Its Performance Evaluation., Choong-Gyoo Lim

LSU Historical Dissertations and Theses

The choice of a proper parametrization method is critical in curve and surface fitting using parametric B-splines. Conventional parametrization methods do not work well partly because they are based only on the geometric properties of given data points such as the distances between consecutive data points and the angles between consecutive line segments. The resulting interpolation curves don't look natural and they are often not affine invariant. The conventional parametrization methods don't work well for odd orders k. If a data point is altered, the effect is not limited locally at all with these methods. The localness property with respect …

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Experimental And Theoretical Study Of Dynamic Water Control In Oil Wells., Ephim I. Shirman Jan 1998

Experimental And Theoretical Study Of Dynamic Water Control In Oil Wells., Ephim I. Shirman

LSU Historical Dissertations and Theses

A dynamic water control, dubbed Downhole Water Sink (DWS) technology, is a well completion technique for production of hydrocarbons from reservoirs with bottom aquifer causing water coning. Typically, a DWS well is dually completed with top completion designated mostly for hydrocarbon production and bottom completion used for water drainage and coning control. Positions and flow rates of the completions are the DWS performance parameters to be determined by a process designer. This dissertation presents a theoretical and experimental study of DWS performance for various reservoir conditions and production schedules. A new mathematical model, developed in this work calculates steady state …

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The Selective Digital Integrator: A New Device For Modulated Polarization Spectroscopy., Aljosa Vrancic Jan 1998

The Selective Digital Integrator: A New Device For Modulated Polarization Spectroscopy., Aljosa Vrancic

LSU Historical Dissertations and Theses

A new device, a selective digital integrator (SDI), for the acquisition of modulated polarization spectroscopy (MPS) signals is described. Special attention is given to the accurate measurement of very small (AC component of interest $<$10$\sp{-3}$ x DC component), rapidly modulated ($\sim$50 kHz) signals at or below noise levels. Various data acquisition methods and problems associated with the collection of modulated signals are discussed. The SDI solves most of these problems and has the following advantages: it provides the average-time resolved profile of a modulated signal; it eliminates errors if the modulation is not sinusoidal; it enables separate measurements of the various phases of the signal modulation cycle; it permits simultaneous measurement of absorption, circular dichroism (CD) and linear dichroism (LD) spectra; it facilitates 3-D absorbance measurements; it has a wide gain-switching-free dynamic range (10 orders of magnitude or more); it offers a constant S/N ratio mode of operation; it eliminates the need for photomultiplier voltage feedback, and it has faster scanning speeds. The time-resolution, selectivity, wide dynamic range, and low-overhead on-the-fly data processing are useful for other modulated spectroscopy (MS) and non-MS experiments such as pulse height distribution and time-resolved pulse counting measurements. The advantages of the MPS-SDI method are tested on the first Rydberg electronic transitions of (+)-3-methylcyclopentanone. The experimental results validate the predicted SDI capabilities. However, they also point to two difficulties that had not been noted previously: the presence of LD in a gaseous sample and a pressure-dependence of the relative peak heights of the CD spectrum. Models for these anomalies are proposed. The presence of the oscillatory LD (but not an LD background) is explained with a sample cell model based on the observed polarization-dependent time-resolved profiles of transmitted light intensity. To obtain expressions for these intensities, a theoretical background, which provides a new approach to the treatment of light/matter interaction, is included as an Appendix. To explain the second anomaly, present only at high optical densities, a model based on the presence of scattered light is introduced and verified. The mode of correction for the scattering problem is outlined.

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Creativity And The Cathartic Moment: Chaos Theory And The Art Of Theatre., Robert E. Brooks Jan 1998

Creativity And The Cathartic Moment: Chaos Theory And The Art Of Theatre., Robert E. Brooks

LSU Historical Dissertations and Theses

This dissertation investigates the potential applications of the scientific paradigm known as "chaos theory" in the examination of dramatic theory. By illuminating the limitations of traditional Newtonian physics and Euclidean geometry, chaos theory conveys philosophical implications that transcend the scientific and provide suitable tools for describing cultural and artistic phenomena. These implications include emphasis on unpredictability, interaction and feedback, qualitative rather that quantitative analyses, and a nonlinear, continuous, even holistic perspective of systems traditionally viewed as dischotomous (such as order and disorder or part and whole). This study examines several standard works of dramatic theory, concentrating on the relationship of …

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Multiobjective Optimal Filtering And Control., Xiang Chen Jan 1998

Multiobjective Optimal Filtering And Control., Xiang Chen

LSU Historical Dissertations and Theses

A fundamental question in feedback control design is how to achieve desired performance under system uncertainties and external disturbances. The well-known LQG and ${\cal H}\sb2$ control design techniques are well suited for achieving some well-defined optimal transient performance under certain classes of stochastic external disturbances such as white noise. However, these optimal control design techniques are highly model dependent and may be very sensitive to parameter variations and system uncertainties. The ${\cal H}\sb{\infty}$ control theory, on the other hand, was developed precisely because of the desire to overcome these deficiencies. One potential shortfall of the existing ${\cal H}\sb{\infty}$ control design …

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Reference Price Effects: The Role Of Multiple Internal Reference Prices And Semantic Cues., Balaji Chandrasekaran Krishnan Jan 1998

Reference Price Effects: The Role Of Multiple Internal Reference Prices And Semantic Cues., Balaji Chandrasekaran Krishnan

LSU Historical Dissertations and Theses

The purpose of this dissertation is two fold. The first objective is to assess the effect of price promotion on consumers' evaluation of the value of the deal independent of the specific IRP used by consumers. Towards this end, a subjective measure called "perceived fairness of the offer price" is introduced in a model hypothesizing relations among transaction utility, acquisition utility, and perceived value of the deal. The proposed model was compared to an existing model designed to predict and explain perceived value of the deal using a survey-based methodology, in the first study. Results indicate that the proposed model …

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Wavelet-Based Registration Of Medical Images., Raj Sharman Jan 1998

Wavelet-Based Registration Of Medical Images., Raj Sharman

LSU Historical Dissertations and Theses

Registration is the process of spatially aligning two objects and is normally a preprocessing step in most object recognition algorithms. Registration of images and recognition of signatures of objects in images is important for clinical and diagnostic purposes in medicine. Recognizing structure, potential targets for defense purposes and changes in the terrain, from aerial surveillance images and SAR images is the focus of extensive research and development today. Automatic Target Recognition is becoming increasingly important as the defense systems and armament technology move to use smarter munitions. Registration of images is a preprocessing step in any kind of machine vision …

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Stress And Strength Of Laminated Composite Containing A Circular Hole., Yi Zhao Jan 1998

Stress And Strength Of Laminated Composite Containing A Circular Hole., Yi Zhao

LSU Historical Dissertations and Theses

This dissertation is to study the stress and strength of a finite laminated plate containing a circular hole subjected to tension. Efforts were made in three aspects: theoretical modeling, computer simulation using finite element method, and experimental evaluation using unidirectional and crossply Scotchply laminates. The stress concentration factor, normal stress distribution and tensile strength of laminates with various hole sizes and gage lengths were investigated. Theoretically, two models were proposed to describe the normal stress distribution of a laminate with finite width and finite length. By defining a width correction function and a size correction function, the normal stress in …

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Literacy Stories: Attitudes Toward Literacy And Motivation To Read Among African-American Males In An Urban Community., Donna Parham Washington Jan 1998

Literacy Stories: Attitudes Toward Literacy And Motivation To Read Among African-American Males In An Urban Community., Donna Parham Washington

LSU Historical Dissertations and Theses

Through methods of ethnographic research this study explores the attitudes toward literacy and the motivation to read of African American male secondary school students in an urban community. This study includes historical inquiry obtained through the gathering of oral histories from men who experienced their youth and adolescence in the same geographic area as the secondary school students. Over the past fifty years the neighborhood focused on in this study has undergone tremendous change, both societal and structural. Information obtained through the interviews of the older men and the younger men will be compared to determine changes in literacy attitudes, …

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An Analysis Of Factors Influencing The Teaching Of Biological Evolution In Louisiana Public Secondary Schools., Donald Wayne Aguillard Jan 1998

An Analysis Of Factors Influencing The Teaching Of Biological Evolution In Louisiana Public Secondary Schools., Donald Wayne Aguillard

LSU Historical Dissertations and Theses

Louisiana public school biology teachers were surveyed to investigate their attitudes toward biological evolution. A mixed method investigation was employed using a questionnaire and open-ended interviews. Results obtained from 64 percent of the sample receiving the questionnaire indicate that although teachers endorse the study of evolution as important, instructional time allocated to evolution is disproportionate with its status as a unifying concept of science. Two variables, number of college courses specifically devoted to evolution and number of semester credit hours in biology, produced a significant correlation with emphasis placed on evolution. The data suggest that teachers' knowledge base emerged as …

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Development Of A New Methodology For Particle Transport Calculations Utilizing Pointwise-Continuous Nuclear Data., Mehdi Asgari Jan 1998

Development Of A New Methodology For Particle Transport Calculations Utilizing Pointwise-Continuous Nuclear Data., Mehdi Asgari

LSU Historical Dissertations and Theses

The purpose of this study is to develop a new method to compute a continuous-energy representation of the neutron flux spectrum using the one-dimensional discrete ordinates method. The technique provides a rigorous calculational tool for applications that require a detailed description of the fine-structure variation in the space-dependent neutron energy spectrum over some energy ranges. This technique uses the combination of multigroup (MG) and rigorous pointwise (PW) solutions to the steady state Boltzmann transport equation in the calculations. Also utilized in this methodology are two new methods called "sub-moment" expansion and "cumulative integral" operator to accurately evaluate the Legendre moments …

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Techniques For Resolving Incomplete Systems In K-Systems Analysis., Gary J. Asmus Jan 1998

Techniques For Resolving Incomplete Systems In K-Systems Analysis., Gary J. Asmus

LSU Historical Dissertations and Theses

K-systems analysis is a generalization of reconstructability analysis (RA), where any general, complete multivariate system (g-system) can be transformed into an isomorphic, dimensionless system (a K-system) that has sufficient properties to be analyzed using probabilistic RA algorithms. In particular, a g-system consists of a set of states formed from a complete combination of the variables assigned specific values from a finite set of possible values and an associated system function value. The g-system must be complete in that all possible states must have an associated system function value. K-systems analysis has been applied to a variety of systems, but many …

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M1 Strength Distributions In Deformed Nuclei., Thomas Georg Beuschel Jan 1998

M1 Strength Distributions In Deformed Nuclei., Thomas Georg Beuschel

LSU Historical Dissertations and Theses

The Elliott SU(3) Model, extended via pseudo-spin for heavy nuclei, is used to study low-lying magnetic dipole excitations in deformed nuclei which axe known as "scissors" modes. Proton and neutron degrees of freedom are handled explicitly and a system Hamiltonian that preserves SU(3) symmetry and one that includes single particle energies as well as quadrupole-quadrupole and pairing two-body interactions are considered. Starting from a basic nuclear Hamiltonian that preserves SU(3) symmetry, a microscopic interpretation of the "scissors" mode of the Two Rotor Model is realized through a linear mapping between invariants of the rotor group and SU(3). The model allows …

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Chiral Recognition With Polymerized Dipeptide Surfactants In Capillary Electrophoresis., Eugene Joseph Billiot Jan 1998

Chiral Recognition With Polymerized Dipeptide Surfactants In Capillary Electrophoresis., Eugene Joseph Billiot

LSU Historical Dissertations and Theses

The research presented in this dissertation involves the use and characterization of polymerized amino acid based surfactants for the enantiomeric separation of chiral compounds using capillary electrophoresis. The first section, Chapter 1, is an introduction to three topics which are relevant to the work presented in this manuscript. The topics include a brief discussion about chirality and chiral recognition, followed by a description of surfactants and micellar systems. The last part of the introduction pertains to capillary electrophoresis and the use of micellar electrokinetic chromatography for enantiomeric separation of chiral compounds. In Chapter 2, the effect of amino acid order …

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Pressure-Induced Changes In Structural And Mechanical Properties Of Gallium Arsenide And Nanophase Silicon Carbide Using Parallel Molecular Dynamics Simulations., Alok Chatterjee Jan 1998

Pressure-Induced Changes In Structural And Mechanical Properties Of Gallium Arsenide And Nanophase Silicon Carbide Using Parallel Molecular Dynamics Simulations., Alok Chatterjee

LSU Historical Dissertations and Theses

Large-scale parallel molecular-dynamics (MD) simulations are performed to investigate properties and processes in nanophase silicon carbide (n-SiC) and gallium arsenide (GaAs) under pressure. These simulations involve 10 6 atoms interacting via realistic interatomic potentials. Structure and sintering of crystalline n-SiC are also investigated with neutron scattering experiments performed at the Intense Pulsed Neutron Source Division (IPNS), Argonne National Laboratory. Both MD simulations and neutron scattering experiments indicate the onset of sintering around 1500K. During sintering, the pores shrink in size while maintaining their morphology: Their fractal dimension remains ∼2.4 and their surface roughness exponent is ∼0.45. The pair distribution functions …

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The Effects Of Autocorrelation In The Estimation Of Process Capability Indices., Lawrence Lee Magee Jan 1998

The Effects Of Autocorrelation In The Estimation Of Process Capability Indices., Lawrence Lee Magee

LSU Historical Dissertations and Theses

The current popularity of the process capability index, a measure of a supplier's ability to meet the product specifications demanded by a customer, has become a matter of some controversy. While admitting the validity of much existing criticism, this research demonstrates that sample estimation of the triple index (Cpl, Cp, Cpu), a variant of the widely used index pair (Cp, Cpk), is equivalent to estimation of the natural parameters (mu, sigma) whenever the measured process characteristic X has an unconditional (marginal) normal probability density function. This includes processes which obey the strictly stationary, normal ARMA( p, q) model. By this …

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Thermomechanical Characterization Of Heat-Activated Coupling For Advanced Composite Piping Systems., Patrick Fitzgerald Mensah Jan 1998

Thermomechanical Characterization Of Heat-Activated Coupling For Advanced Composite Piping Systems., Patrick Fitzgerald Mensah

LSU Historical Dissertations and Theses

A new technology for joining advanced composite piping systems, based on heat-activated coupling (HAC) of a thermosetting pre-impregnated (prepreg) fiber reinforced material has been advanced. The successful design of a heat-activated coupled joint depends on achieving the following requirements: (1) uniformly cured prepreg bonded to the surfaces of coupled pipe; and (2) minimal residual thermal stress as a result of the curing process. In order to address the above concerns, thermal characterization of the uncured and cured prepreg used was undertaken in order to establish prerequisite chemical kinetics parameters and material property data required for the curing process models and …

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Rhetoric And Social Struggle: In Search Of The Topoi Of Violence., Edward Christopher Reilly Jan 1998

Rhetoric And Social Struggle: In Search Of The Topoi Of Violence., Edward Christopher Reilly

LSU Historical Dissertations and Theses

The rhetorical study of violence tends to examine violence within larger generic boundaries such as social movements studies or war rhetoric. In order to work toward a generalizable rhetorical theory of violence and discourse, this study examines texts which justify violence across generic boundaries. Accordingly, four case studies individually examine texts which justify political violence. This study compares and contrasts the rhetorical strategies of George Bush, the Unabomber, Earth First! and Abbie Hoffman. This study concludes that there are no universal strategies among the four case studies in the justification of violence. However, there appears to be a continuum of …

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A Palynological Study Of Two Upland Bogs In The Gulf Coastal Plain, Alabama And Mississippi, Linda C. Pace Dec 1997

A Palynological Study Of Two Upland Bogs In The Gulf Coastal Plain, Alabama And Mississippi, Linda C. Pace

LSU Historical Dissertations and Theses

Fewer Quaternary palynological studies have been conducted in the Gulf Coastal Plain of the southeastern United States than In the northern United States and Canada, resulting in major gaps in the pollen record of this region. The existing studies display discrepancies in the chronology of the pine rise, appearance of the modem climatic regime and vegetation, and timing of the Hypsithermal. In order to fill a gap in the paleoecological data network of the Gulf Coastal Plain, pollen analysis, charcoal analysis, and sediment stratigraphic techniques were used to reconstruct the last 6500 years of Sweetbay Bog, Mississippi, and Minamac Bog, …

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A New Young Diagrammatic Method For Kronecker Products Of O(N) And Sp(2m), Pan Feng, Shihai Dong, J. P. Draayer Dec 1997

A New Young Diagrammatic Method For Kronecker Products Of O(N) And Sp(2m), Pan Feng, Shihai Dong, J. P. Draayer

Faculty Publications

A new simple Young diagrammatic method for Kronecker products of O(n) and Sp(2m) is proposed based on the representation theory of Brauer algebras. A general procedure for the decomposition of the tensor products of representations for O(n) and Sp(2m) is outlined, which is similar to that for U(n) known as the Littlewood rules, together with trace contractions from a Brauer algebra and some modification rules given by King.

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