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Microstructure Evolution And Its Influence On Thermal Expansion And Tensile Properties Of The Superalloy In738lc At High Temperatures., Ercan Balikci Jan 1998

Microstructure Evolution And Its Influence On Thermal Expansion And Tensile Properties Of The Superalloy In738lc At High Temperatures., Ercan Balikci

LSU Historical Dissertations and Theses

Three major aspects of the superalloy IN738LC are studied in this dissertation: (i) precipitate microstructure evolution, (ii) tensile mechanical properties, and (iii) thermal expansion characteristics. IN738LC is a Ni-base, $\gamma\sp\prime$ Ni$\sb3$Al(Ti) precipitate-strengthened alloy. This alloy includes $\sim$20-43 volume % $\gamma\sp\prime$ and also some (Ta,Ti)C at the grain boundaries and in the matrix. Different heat treatments were carried out to study the precipitate evolution mechanisms and kinetics in this superalloy. It was found that the proper solution treatment producing the single-phase supersaturated solid solution condition is 1235$\sp\circ$C/4h/WQ. Solution treatment at 1200$\sp\circ$C/4h/WQ, however, produces a refined precipitate microstructure. Aging treatments after both …

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Locus Of Reform: From Reflection To Effectiveness Through The Voices Of Novice Teachers., Patricia Babin Caillouet Jan 1998

Locus Of Reform: From Reflection To Effectiveness Through The Voices Of Novice Teachers., Patricia Babin Caillouet

LSU Historical Dissertations and Theses

This descriptive multiple-case qualitative study focused on the professional and personal experiences of five novice teachers--three preservice student teachers and two first-year teachers. Research conducted in two exemplary elementary schools examined the following questions: (a) How do preservice and first-year teachers use reflective practice and self-assessment to develop effective teaching practices? (b) How do the preservice and first-year teachers' approaches to effective literacy instruction compare? (c) Why does reflection not translate into effectiveness? and (d) How is effectiveness perceived in the professional, social school environment of novice teachers? Results of the case studies determined that teacher education programs must go …

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An Investigation Of The Relationship Between Teachers' Orientations In Reading Process And Instruction: Four Case Studies., Carrice Lou Cummins Jan 1998

An Investigation Of The Relationship Between Teachers' Orientations In Reading Process And Instruction: Four Case Studies., Carrice Lou Cummins

LSU Historical Dissertations and Theses

The beliefs that teachers hold about how children learn are often reflected in the instructional practices they use to help children become readers. The purpose of this study was threefold: (a) to identify teachers' beliefs regarding how reading takes place and how reading develops, (b) to examine the instructional reading practices implemented in teachers' classrooms, and (c) to explore the relationships between teachers' theoretical beliefs and their instructional practices in providing appropriate reading instruction. Qualitative methods informed this study by providing case studies of four primary grade teachers, giving detailed accounts of their theoretical beliefs--process and instruction. Two of the …

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Supplemental Organic Chromium For Dairy Calves., Christopher L. Depew Jan 1998

Supplemental Organic Chromium For Dairy Calves., Christopher L. Depew

LSU Historical Dissertations and Theses

In Exp. 1, 42 calves were fed milk replacer and then starter either with or without 1 ppm supplemental chromium (Cr) as Cr-picolinate. Neither Cr nor sex affected growth performance. With the exception of plasma nonesterified fatty acid concentrations (NEFA), weekly plasma metabolites were not affected by Cr or sex. Pre- and postfeeding plasma NEFA concentrations were lower in Cr-fed calves, but were not affected by sex. AU calves seemed to become less insulin sensitive with age, as plasma glucose became lower and insulin higher as calves became older. During i.v. glucose tolerance tests (IVGTT), calves cleared glucose faster at …

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A Rhetoric Of Religious Order: The Case Of The Promise Keepers., Michael Ellsworth Eidenmuller Jan 1998

A Rhetoric Of Religious Order: The Case Of The Promise Keepers., Michael Ellsworth Eidenmuller

LSU Historical Dissertations and Theses

This study employs a Burkeian critical perspective to explain the growth and impact of the evangelical movement-organization known as Promise Keepers. Specific attention is given to the strategies of identification by which Promise Keepers manages the exigencies of identity, recruitment, and opposition. In addition, this study introduces the concept of the scriptural implant, a strategy of identification by which Promise Keepers attempts to secure the truth and authority of its discourse. Data for this study were selected from a range of sources, including published literature, audio and video tapes, and Internet materials produced by Promise Keepers. Interviews with Promise Keepers' …

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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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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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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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A Cross-Site Inquiry Into Reading Instruction In Differentially Successful Title I Schools., Gypsye Dugas Bryan Jan 1998

A Cross-Site Inquiry Into Reading Instruction In Differentially Successful Title I Schools., Gypsye Dugas Bryan

LSU Historical Dissertations and Theses

By design, elementary schools are places where students perform specified tasks and become literate. In practice, elementary schools enroll students who engage in instructional activity, yet many of these students fail to reach minimum literacy standards. This multiple-case qualitative inquiry focused on the inner workings of schools where students placed at risk learned to read and examined schools where similar students did not learn to read. Research conducted in four elementary schools addressed the following questions: (a) What resources, time factors, and management systems do elementary teachers use to create an effective reading environment? (b) How do reading assessment measures …

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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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Advances In The Chemistry Of Fullerene Fragments., Mark D. Clayton Jan 1998

Advances In The Chemistry Of Fullerene Fragments., Mark D. Clayton

LSU Historical Dissertations and Theses

This dissertation deals with the synthesis and characterization of novel intermediate target molecules that when placed under pyrolytic conditions, yield polynuclear aromatic hydrocarbons that can be identified on the surface of buckminsterfullerene. It also presents some direct applications that have developed from some significant synthetic improvements of key intermediates required for production of novel fullerene fragments. Chapter one presents the synthetic routes used to prepare C32H 12 and attempts toward synthesizing C40H14 and C46H20. The novel C32H12 is only the second known fullerene fragment that contains more than thirty carbon atoms. It is successfully produced by flash vacuum pyrolysis by …

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A Roll Call Analysis Of Family Policy Legislation In The United States House Of Representatives: 1979-1994., Elizabeth Stewart Atkinson Jan 1998

A Roll Call Analysis Of Family Policy Legislation In The United States House Of Representatives: 1979-1994., Elizabeth Stewart Atkinson

LSU Historical Dissertations and Theses

This study is an examination of the roll call voting behaviors of members of the House of Representatives toward family policy legislation during the years 1979 to 1994. The two objectives of this study are (a) to determine whether a family policy domain exists among the legislation considered by the House during each of the sessions examined in this study, and (b) to explain and predict the voting behavior of House members toward family policy legislation. After a review of the theories of legislative voting behavior, the literature on legislative voting behavior, and the relevant family science literature, an empirical …

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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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Indigenous Rights Movements, Land Conflicts, And Cultural Politics In Taiwan: A Case Study Of Li-Shan., Yi-Fong Chen Jan 1998

Indigenous Rights Movements, Land Conflicts, And Cultural Politics In Taiwan: A Case Study Of Li-Shan., Yi-Fong Chen

LSU Historical Dissertations and Theses

Land rights claims remain the major focus of world indigenous movements. Lands relate to the formation of indigenous identity, religious practices, and the material base for indigenous cultural survival. From a spatial/geographical perspective, this dissertation explores the influences of Taiwan's state policies on indigenous peoples, their cultures, identities, and human-land relationship. The Li-shan area, in central Taiwan, is the focus of the research due to the fact that the most severe land disputes are in this area, as well as longest history of economic interactions among indigenous peoples, the dominant Han people, and the State, in the postwar Taiwan. The …

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Spatial Variability Of Coastal Organic Soil Characteristics., L. Cecil Dharmasri Jan 1998

Spatial Variability Of Coastal Organic Soil Characteristics., L. Cecil Dharmasri

LSU Historical Dissertations and Theses

This dissertation is a part of the Louisiana NASA/EPSCoR (Experimental Program to Stimulate Competitive Research) global change research, which studied the fate of carbon and sediments within the Barataria Bay Basin, Louisiana. It studied water composition to assess seawater influence within the marsh. Ion exchange resin strips were used to study the effect of salinity and Chloride (Cl) on sulfate (SO4) reduction and their potential for water and soil analysis. Chloride dominated the water system and the Cl/SO 4 ratio can be used to assess the seawater influence. Resin extractable sulfur (S) predicted non-pyritic S fraction for the marsh soils. …

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Evangelical Communication: Reference Group Membership Influence On Message Interpretation And Public Opinion., Mary Diane Hollems Jan 1998

Evangelical Communication: Reference Group Membership Influence On Message Interpretation And Public Opinion., Mary Diane Hollems

LSU Historical Dissertations and Theses

The purpose of the present dissertation was to examine the influence of reference group membership on message interpretation and whether one's interpretation then influences one's agreement with the message source and subsequent willingness to speak with the message source about the topic. In particular, this study looked at conservative Christian reference group membership and message interpretations about the topic of abortion. The independent variables of level of Christian fundamentalism, involvement in a Christian reference group, and socio-political conservatism were averaged to create a conservative fundamentalist composite score which was then used to split the sample at the median. Findings indicated …

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Characterization And Analysis Of The Superabrasive Diamond Blade Sawing Process., Harlan Dwayne Jerro Jan 1998

Characterization And Analysis Of The Superabrasive Diamond Blade Sawing Process., Harlan Dwayne Jerro

LSU Historical Dissertations and Theses

Diamond-impregnated segmented circular blade sawing is one of the most effective, versatile, and extensively used methods of processing rock and other hard materials, such as granite, marble, concrete and asphalt. For many years, it has been known that chip thickness is one of the most significant parameters in the understanding of the sawing process, and other variables such as force and power have been correlated with it. In this work, the material chipping geometries have been mathematically defined and derived through kinematics analysis. From these chipping geometries, chip area and thickness relations have been obtained. A relation for the mean …

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Influence Of Diet And Genetic Strain On Desirable Flavors In Farm-Raised Catfish., Carol Ann Kelly Jan 1998

Influence Of Diet And Genetic Strain On Desirable Flavors In Farm-Raised Catfish., Carol Ann Kelly

LSU Historical Dissertations and Theses

This farm-raised catfish quality study measured desirable flavor attributes, Chickeny, Nutty, Fat Complex, Corn, Sweet, with the objective to determine effects of feed ingredients, time-on-diet and genetic strain. Overall flavor impact differences were tested by triangle tests. The diets were Casein-base reference feed by itself or partially substituted with: 10% catfish meal, 10% meat and bone meal, 10% rice bran, or 3% menhaden oil and commercial feed formulation. Fish were grown indoors to minimize environmental flavors for 70, 160, 210 and 318 days. The genetic strains evaluated were channel, albino channel, blue, hybrid channel x blue, and black bullhead catfish. …

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Moth Diversity In Louisiana Longleaf Pine Savannas And Mixed Mesophytic Hardwood Forests: Species Composition And Management Effects., Deborah Landau Jan 1998

Moth Diversity In Louisiana Longleaf Pine Savannas And Mixed Mesophytic Hardwood Forests: Species Composition And Management Effects., Deborah Landau

LSU Historical Dissertations and Theses

Two habitats, a mixed hardwood forest and a longleaf pine savanna, were selected for analysis of moth composition. Three studies assessed differences between moth diversity, efficiency of sampling intensities, and effects of management practices in these habitats. The first study compared diversity and community composition between the two habitats based on 4,337 moths representing 394 species. The mixed hardwood habitat contained 314 species and the longleaf pine 208. Species overlap between two longleaf pine sites was as low as overlap between longleaf pine and mixed hardwood habitats (38%). Differences in moth richness between habitats may be a reflection of differences …

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Perception-Action Coupling During Goal-Directed Locomotion Without Vision., Robert D. Clark Jan 1998

Perception-Action Coupling During Goal-Directed Locomotion Without Vision., Robert D. Clark

LSU Historical Dissertations and Theses

The ability to walk to distant targets accurately without the use of vision has been demonstrated in a number of studies (e.g., Elliott, 1987; 1990; Loomis, Da Silva, Philbeck, & Fukusima, 1996; Rieser, Ashmead, Talor, & Youngquist, 1990; Steenhuis & Goodale 1988; Thomson, 1983). Processes underlying the mechanisms involved in this ability however, are not completely understood. One possible mechanism examined involves non-visual sensory flows during locomotion. In Experiment 1, manipulations to normal walking led to significant increases in error relative to the control group. Error expressed as a percentage of target distance revealed that target distance did not affect …

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Airbirds: Adaptative Strategies To The Aerial Lifestyle From A Life History Perspective., Manuel Marin-Aspillaga Jan 1998

Airbirds: Adaptative Strategies To The Aerial Lifestyle From A Life History Perspective., Manuel Marin-Aspillaga

LSU Historical Dissertations and Theses

"Airbirds" are defined as those birds that are adapted to almost constant life on the wing and do not perch, except for breeding and roosting. They use the air as the only medium in which to find and gather food. One taxon meets that definition: the swifts (Apodidae). Foraging zones of airbirds can be segregated in terms of clutch size, commuting foraging distance, nestling period, and nestling feeding rate. This study looked at foraging behavior and nestling diet, incubation patterns and mode of development in cypseloidine swifts, that as a group has extreme life history patterns. In a temperate one-egg …

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Redefining Babes, Booze And Brawls: Men Against Violence. Towards A New Masculinity., Luoluo Hong Jan 1998

Redefining Babes, Booze And Brawls: Men Against Violence. Towards A New Masculinity., Luoluo Hong

LSU Historical Dissertations and Theses

Despite evidence that 90% of violent crimes are committed by men, higher education professionals and researchers still understand relatively little about the process by which mate students acquire the attitudes, knowledge, values and skills which serve as deterrents to perpetrating violence against women and against other men. Men Against Violence is a peer advocacy organization at a large, public Research I institution in the South which focuses on the special and unique responsibility men have to end violence. Through participation in a wide array of service learning, community action and leadership opportunities, MAV members challenge cultural norms which link masculinity …

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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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Beta-Carotene And Exercise Performance: Effects On Race Performance, Oxidative Stress, And Maximal Oxygen Consumption., Kim Edward Leblanc Jan 1998

Beta-Carotene And Exercise Performance: Effects On Race Performance, Oxidative Stress, And Maximal Oxygen Consumption., Kim Edward Leblanc

LSU Historical Dissertations and Theses

There is evidence in the literature that suggests a possible worthwhile role of antioxidants during athletic endeavors and exercise performance. Several studies have evaluated the antioxidant ability of beta-carotene and demonstrated a beneficial influence. However, these studies have investigated beta-carotene's effects within an antioxidant mixture which included other antioxidant vitamins. Consequently, this study attempted to isolate the antioxidant role of beta-carotene during exercise. Three parameters of beta-carotene influence were measured using eleven well-trained runners: serum malondialdehyde (MDA) concentration (a marker of free radical generation), 5000 meter race performance, and maximum oxygen consumption (VO2max). Subjects were tested using a double-blinded cross-over …

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Factors Determining University Enrollment Status: The Case Of High School Students Recruited To Attend Louisiana State University College Of Agriculture., Fredrick Muyia Nafukho Jan 1998

Factors Determining University Enrollment Status: The Case Of High School Students Recruited To Attend Louisiana State University College Of Agriculture., Fredrick Muyia Nafukho

LSU Historical Dissertations and Theses

The purpose of this study was to determine whether a model existed that significantly increased the researcher's ability to accurately explain whether or not a recruited student in the College of Agriculture at LSU will enroll based upon the current recruitment strategies. The target population for this study consisted of 1,130 prospective freshmen recruited to attend the College of Agriculture in the fall 1997. A comparison of students who resided on the College of Agriculture's 1997 prospective freshmen data base, with the university undergraduate data base gave an accessible population of 226 students. The actual sample size was determined using …

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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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Deviating Angular Feature For Image Recognition System Using The Improved Neural Network Classifier., Adisak Srinakarin Jan 1998

Deviating Angular Feature For Image Recognition System Using The Improved Neural Network Classifier., Adisak Srinakarin

LSU Historical Dissertations and Theses

The ability to recognize images makes it possible to abstractly conceptualize the world. Many in the field of machine learning have attempted to invent an image recognition system with the recognition capabilities of a human. This dissertation presents a method of modifications to existent image recognition systems, which greatly improves the efficiency of existing data imaging methods. This modification, the Deviating Angular Feature (DAF), has two obvious applications: (1) the recognition of handwritten numerals; and (2) the automatic identification of aircraft. Modifications of feature extraction and classification processes of current image recognition systems can leads to the systemic enhancement of …

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Measurement Of The Cross Section For Elastic Scattering Of Electron Neutrinos On Electrons., Neville Dinyar Wadia Jan 1998

Measurement Of The Cross Section For Elastic Scattering Of Electron Neutrinos On Electrons., Neville Dinyar Wadia

LSU Historical Dissertations and Theses

In this dissertation, we measure the cross section for the elastic scattering of electron neutrinos on electrons. We use data from the LSND experiment which is located at the Los Alamos Neutron Scattering Center at Los Alamos National Laboratory, New Mexico. The neutrino beam is produced when an 800 MeV proton beam from a linear accelerator is incident on a target located 29.8 m from the detector. The LSND veto system allows us to reject charged cosmic-ray particles entering the detector with high efficiency. The detector consists of 180 tons of mineral oil, to which a small quantity of scintillator …

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Components That Should Be Included In An Ethics Enhancement Program For State Legislatures., Kenneth Ward Jan 1998

Components That Should Be Included In An Ethics Enhancement Program For State Legislatures., Kenneth Ward

LSU Historical Dissertations and Theses

The purpose of the study was to identify the components and sub-components that should be included in an ethics enhancement program for a state legislature, as perceived by a national panel of experts in the areas of legislative ethics. A Delphi panel comprised of state legislators and state ethics officers was established and comprised of persons representing each of the four regions of the United States. In Round One of the study, the panel identified 12 primary components and 124 related sub-components for an ethics enhancement program in a state legislature. Each of the suggested items were unique and nearly …

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The Nature Of Undergraduates' Conceptual Understanding Of Oxygen Transport And Utilization In Humans: Can Cardiopulmonary Simulation Software Enhance Learning Of Propositional Knowledge And/Or Diagnose Alternative Conceptions In Novices And Intermediates?, Dennis Robert Wissing Jan 1998

The Nature Of Undergraduates' Conceptual Understanding Of Oxygen Transport And Utilization In Humans: Can Cardiopulmonary Simulation Software Enhance Learning Of Propositional Knowledge And/Or Diagnose Alternative Conceptions In Novices And Intermediates?, Dennis Robert Wissing

LSU Historical Dissertations and Theses

The purpose of the this research was to explore undergraduates' conceptual development for oxygen transport and utilization, as a component of a cardiopulmonary physiology and advanced respiratory care course in the allied health program. This exploration focused on the student's development of knowledge and the presence of alternative conceptions, prior to, during, and after completing cardiopulmonary physiology and advanced respiratory care courses. Using the simulation program, SimBioSysTM (Samsel, 1994), student-participants completed a series of laboratory exercises focusing on cardiopulmonary disease states. This study examined data gathered from: (1) a novice group receiving the simulation program prior to instruction, (2) a …

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