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1998

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Reverse Engineering Biological Control Systems For Applications In Process Control., Richard Brian Mclain Jan 1998

Reverse Engineering Biological Control Systems For Applications In Process Control., Richard Brian Mclain

LSU Historical Dissertations and Theses

The main emphasis of this dissertation is the development of nonlinear control strategies based on biological control systems. Commonly utilized biological control schemes have been studied in order to "reverse engineer" the important concepts for applications in process control. This approach has led to the development of a nonlinear habituating control strategy and nonlinear model reference adaptive control schemes. Habituating control is a controller design strategy for nonlinear systems with more manipulated inputs than controlled outputs. Nonlinear control laws that provide input-output linearization while simultaneously minimizing the cost of affecting control are derived. Local stability analysis shows the controller can …

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Access To Child Care In North Carolina: The Interaction Of Gender Relations, Class, And Government Policy Across Places And Scales., Bonnie Morris Henderson Jan 1998

Access To Child Care In North Carolina: The Interaction Of Gender Relations, Class, And Government Policy Across Places And Scales., Bonnie Morris Henderson

LSU Historical Dissertations and Theses

Access to child care is becoming an increasingly critical economic and social issue for American families as more and more women work outside the home. In addition to being an important economic and social issue, access to child care is also a significant geographical issue, in two senses. First, place is an important component of child care access; substantial spatial variations exist in child care services in the United States. Secondly, attention to issues of scale is important when examining child care issues since access to child care is shaped by both local and non-local forces. I use both horizontal …

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Hierarchical Estimation Of Oceanic Surface Velocity Fields From Satellite Imagery., Thomas Dean Leming Jan 1998

Hierarchical Estimation Of Oceanic Surface Velocity Fields From Satellite Imagery., Thomas Dean Leming

LSU Historical Dissertations and Theses

Oceanic surface velocity fields are objectively estimated from time-sequential satellite images of sea-surface temperature from the Advanced Very High Resolution Radiometey on board the National Oceanic and Atmospheric Administration's polar orbiters. The hierarchical technique uses the concept of image pyramids and multi-resolution grids for increased computational efficiency. Images are Gaussian filtered and sub-sampled from fine to coarse grid scales. The number of pyramid levels is selected such that the maximum expected velocity in the image results in a displacement of less than one pixel at the coarsest spatial scale. Maximum Cross-Correlation at the sub-pixel level with orthogonal polynomial approximation is …

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Cerebral Hemoglobin Oxygen Saturation In Patients With Restless Legs Syndrome And Periodic Limb Movements In Sleep., Mark Jude Hurry Jan 1998

Cerebral Hemoglobin Oxygen Saturation In Patients With Restless Legs Syndrome And Periodic Limb Movements In Sleep., Mark Jude Hurry

LSU Historical Dissertations and Theses

Pathogenic theories of Restless Legs Syndrome (RLS) and Periodic Limb Movements in Sleep (PLMS) were reviewed and critiqued, and a new theory for the pathogenesis of RLS and PLMS was presented. It was proposed that both disorders are caused by sleep-related hypoperfusion in the area of the cerebral cortex that mediates sensation and movement in the legs. The hypoperfusion was proposed to be caused by high amplitude oscillations in total cerebral blood flow known as B-waves and by flow-reducing turbulence at several of the bifurcations in the anterior cerebral artery. This theory was tested by using near infrared spectroscopy (NIRS) …

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Biological And Molecular Properties Of Potyviruses Isolated From Sweet Potato., Eliezer Rodrigues De Souto Jan 1998

Biological And Molecular Properties Of Potyviruses Isolated From Sweet Potato., Eliezer Rodrigues De Souto

LSU Historical Dissertations and Theses

Ten potyvirus isolates from sweet potato (Ipomoea batatas) cv. Beauregard showing russet crack symptoms and three other isolates associated with internal cork and feathery mottle symptoms were obtained from commercial fields in the United States. The biological properties of these isolates and those of a mechanically transmitted virus obtained from I. purpurea were compared with a previously characterized sweet potato feathery mottle virus strain (SPFMV-C) from North Carolina. The symptoms induced in a range of hosts indicated that two of the isolates were associated with russet crack symptoms in the cultivar Jersey; however, none of them could be associated with …

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Comparison Of Students Enrolled In An Alternative Academic Program With Regularly Enrolled Students In A Research I University., Margo Myers Abadie Jan 1998

Comparison Of Students Enrolled In An Alternative Academic Program With Regularly Enrolled Students In A Research I University., Margo Myers Abadie

LSU Historical Dissertations and Theses

The purpose of this study was to describe an academic program, ACCESS, initiated to support entering freshmen students who did not meet the required admission standards for Louisiana State University in Baton Rouge. The ACCESS Program offered support in the areas of tutoring and special classes for the first 24 credit hours of study. The second part of the study was to compare academic and personal characteristics of ACCESS Students to a sample of Regularly Enrolled Freshmen Students to determine if differences existed between the two groups. Participants in the study were 244 ACCESS Students and 244 Regularly Enrolled Freshmen …

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The Relationship Of Social Skills To Psychopathology For Individuals With Mild And Moderate Mental Retardation., Stephen Joseph Anderson Jan 1998

The Relationship Of Social Skills To Psychopathology For Individuals With Mild And Moderate Mental Retardation., Stephen Joseph Anderson

LSU Historical Dissertations and Theses

Recent advances in the field of mental retardation have included the development of instruments for assessment of both psychopathology and social skills in individuals with mental retardation. Researchers have subsequently begun investigating relationships between psychopathology and social skills in individuals with mental retardation. Initial studies have focused on persons with severe and profound mental retardation. The present study examined the relationship between psychopathology and social skills in individuals with mild and moderate mental retardation. This investigation used the Assessment for Dual Diagnosis (ADD) to measure psychopathology and the Social Performance Survey Schedule (SPSS) to evaluate social skills. Significant differences were …

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Granular Activated Carbon From Agricultural By-Products: Carbon Properties And Their Relationship To Sugar Decolorization Potential., Mohamed Ahmedna Jan 1998

Granular Activated Carbon From Agricultural By-Products: Carbon Properties And Their Relationship To Sugar Decolorization Potential., Mohamed Ahmedna

LSU Historical Dissertations and Theses

Representative samples of soft, low density, group 1 (rice straw, rice hulls, sugarcane bagasse) and hard, high density, group 2 agricultural by-products (pecan shells) were converted into granular activated carbons (GACs). Prior to pyrolysis, group 1 by-products were mixed with four binders, sugarcane molasses, sugar beet molasses, corn syrup and coal tar. GACs were produced from group 1 and 2 materials by physical activation (carbon dioxide, steam) or from group 2 materials by chemical activation (phosphoric acid). Carbons were evaluated for their physical (hardness, bulk density), chemical (ash, pH), surface (total surface area, pore size distribution, surface oxides) and adsorption …

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Psychological Adjustment In Children Of Mothers With Eating Disorders., Jane Marie Barbin Jan 1998

Psychological Adjustment In Children Of Mothers With Eating Disorders., Jane Marie Barbin

LSU Historical Dissertations and Theses

In recent years, there have been a few reports of the relationship between eating disorders in mothers and the psychological adjustment of their children. Most of these reports have been based upon anecdotal case studies, however a wide range of prenatal, perinatal, and postnatal complications, including behavioral and feeding difficulties in children of these mothers has been described. This study advanced research in this area by incorporating both normal and depression comparison groups. The relationship between group membership of 65 mothers and responses on several child and parent dependent variables was evaluated by having mothers complete self-report measures. Overall it …

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Quantifying Sustainability In Aquaculture Production., Rex Hall Caffey Jan 1998

Quantifying Sustainability In Aquaculture Production., Rex Hall Caffey

LSU Historical Dissertations and Theses

Despite increasing institutional focus in aquaculture, sustainability remains an amorphous and much debated concept. Little consensus has been identified on the issue beyond the general recognition that the concept should contain environmental, economic, and sociological considerations. This study addressed the specific, relevant question of whether politically diverse aquacuiture interests can collectively develop and agree on production-level goals and indicators of aquaculture sustainability. The research partitioned sustainability into its three subcategories: environmental, economic and social. This division facilitated the use of existing conventions of measurement and expression in each subcategory. Employing a modified Delphi technique, over 100 aquaculture stakeholders in the …

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Public High School Restructuring/Reform Efforts In Louisiana., Martha Diane Shuckrow Cook Jan 1998

Public High School Restructuring/Reform Efforts In Louisiana., Martha Diane Shuckrow Cook

LSU Historical Dissertations and Theses

The purpose of this study was to investigate the restructuring/reform efforts in Louisiana public schools. The population for this study was defined as Louisiana public school principals who were employed for the year 1997--1998 in schools that contain at least grades 10, 11, and 12, but are not classified as alternative schools. The Louisiana High School Coaches Association Constitution and Directory (1997--98) and the Louisiana School Directory (1997--98) (Bulletin 1462) published by the Louisiana Department of Education provided the frame for the study. A simple random sample, with replacement, of principals from Louisiana public high schools participated in the study. …

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Internal Defect Detection In Hardwood Logs With Fast Magnetic Resonance Imaging., Eyler Robert Coates Jr Jan 1998

Internal Defect Detection In Hardwood Logs With Fast Magnetic Resonance Imaging., Eyler Robert Coates Jr

LSU Historical Dissertations and Theses

Identification of defects such as knots in logs before the cutting operation would allow lumber mills to maximize the value of lumber from each log. This dissertation presented images obtained from scanning an oak log with magnetic resonance imaging (MRI). The unique characteristics of MRI images of hardwood logs were noted and were used to derive a quick algorithm to isolate defects. Defect regions had some pixels that varied considerably in intensity from their neighborhood, providing a seed for initiating the defect region. There was an overlap between the pixel gray level of the defects and clear wood. Therefore, traditional …

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Dialogue Between Confucius And Socrates: Norms Of Rhetorical Constructs In Their Dialogical Form And Dialogic Imagination., Bin Xie Jan 1998

Dialogue Between Confucius And Socrates: Norms Of Rhetorical Constructs In Their Dialogical Form And Dialogic Imagination., Bin Xie

LSU Historical Dissertations and Theses

The present dissertation consists of six parts: an introduction, four chapters and a conclusion. It is intended to recapture the rhetorical norms governing the Confucian and Socratic dialogues--their voice of credibility, proto-scientific attitude, tragic consciousness, and use of irony--so as to demonstrate how rhetoric enables them to carry out their political, philosophical and epistemological pursuits; my research aims at the description of similarities and differences between Socrates's and Confucius's rhetorical methods, which are shaped by their respective historical and cultural contexts. Specifically, my major objectives are to foreground, in accordance with Mikhail Bakhtin's theory of dialogism, the significance of the …

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An Evaluation Of Student Support Services At Southeastern Louisiana University., Lavanner Showers Brown Jan 1998

An Evaluation Of Student Support Services At Southeastern Louisiana University., Lavanner Showers Brown

LSU Historical Dissertations and Theses

The purpose of this study was to evaluate the effectiveness of Student Support Services (SSS) at Southeastern Louisiana University as these services relate to grade point averages and retention rates. Four groups of 45 students were selected for the study. Forty-five SSS freshmen participants were matched on their at risk classification with 45 non-SSS participants. Forty-five SSS sophomores and 45 non-SSS contemporary sophomores were also matched according to the at risk classification. First generation and low income students who scored 18 and below on the ACT, and had earned a high school grade point average of 3.0 or less constitute …

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Apoptosis, Pcna, And P53, In Fundulus Grandis Fish Liver After In-Vivo Exposure To Mnng And 2-Af., Uriel Blas-Machado Jan 1998

Apoptosis, Pcna, And P53, In Fundulus Grandis Fish Liver After In-Vivo Exposure To Mnng And 2-Af., Uriel Blas-Machado

LSU Historical Dissertations and Theses

Dysfunction in homeostatic mechanisms of cell death and proliferation are considered to be important in carcinogenesis. The p53 gene has been implicated in the regulation of cell death and proliferation. The host response was measured through sequential immunohistochemical (IHC) detection of apoptosis, PCNA, and p53 in livers of Fundulus grandis fish exposed to MNNG or to 2-AF, two known carcinogens. Studies performed determined the stability of MNNG in saltwater, the suitability of different fixatives on IHC detection of apoptosis, PCNA-PC10, and p53 (various clones), and frequencies of expression of apoptosis, PCNA, and p53. A total of 996 fish specimens were …

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All Blues: A Study Of African-American Resistance Poetry., Anthony Jerome Bolden Jan 1998

All Blues: A Study Of African-American Resistance Poetry., Anthony Jerome Bolden

LSU Historical Dissertations and Theses

Since the beginning of the twentieth century, critics of African-American poetry have disagreed vehemently about poetic form. Some, like J. Saunders Redding, for instance, have expressed skepticism about poetry based upon oral forms. Others, like Sterling Brown, have argued that a viable poetics can be developed from black expressive forms. This dissertation analyzes the debate over black poetic form and traces the development of modernist and postmodernist poetics that have been shaped by the specific contours of African-American vernacular culture. Yet this study is not merely formalistic. Although "All Blues" describes a blues aesthetic by examining intersexual relationships between the …

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Media Priming In The 1980 Presidential Election., Gina Leigh Corell Jan 1998

Media Priming In The 1980 Presidential Election., Gina Leigh Corell

LSU Historical Dissertations and Theses

This study will focus on a specific election, the 1980 presidential race. Through an examination of the media coverage, key issues, and the candidates, this research will provide a context for the statistical analysis that follows. This research explores the impact of media and other determinants of candidate assessment and vote choice. The findings in this study not only support the argument that news affects elections but also clarify the exact nature of that influence. The research uses the theory of priming as its theoretical base. The American National Election Study Survey for the 1980 presidential election is the data …

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Molecular Systematics Of Selected Members Of The Black Basses, Genus Micropterus, With Concentration On The Spotted Bass (M. Punctulatus) Species Complex., Belinda Fuller Jan 1998

Molecular Systematics Of Selected Members Of The Black Basses, Genus Micropterus, With Concentration On The Spotted Bass (M. Punctulatus) Species Complex., Belinda Fuller

LSU Historical Dissertations and Theses

This study examined genetic relationships among selected populations of black basses. These centrarchid fishes, separated by both physical barriers (land formations) and distance, have shown varying degrees of differentiation, but retain many morphometric characters in common. Eight populations representing four taxa and geographical extremes in the genus Micropterus, with concentration on the spotted bass complex, were selected and evaluated for biochemical genetic characters. This study examined two species and two subspecies of spotted basses. The type species from Kentucky represented Micropterus punctulatus punctulatus; a population from Alabama represented M. p. henshalli. A Texas population, previously classified as conspecific with spotted …

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An Exploration Of The Relationship Between Principal Leadership Style And Student Academic Achievement In The Philippines., Mary Sylvette Tanjuan Gunigundo Jan 1998

An Exploration Of The Relationship Between Principal Leadership Style And Student Academic Achievement In The Philippines., Mary Sylvette Tanjuan Gunigundo

LSU Historical Dissertations and Theses

Principal leadership has been identified to be a crucial factor in the success of a school. One measure of school success is student academic achievement. Effective school literature suggests that there exist a relationship between principal leadership and student academic achievement. Thus, this study explored the relationship between principal leadership style (transformational, transactional, or laissez-faire) and student academic achievement in the Philippines. Three control variables were considered in examining this relationship and these were teacher educational background, student population, and student socio-economic status (SES). This study was conducted in thirty-six elementary public schools in the Philippines. The revised Multifactor Leadership …

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Processing, Microstructures, And Properties Of Cu-Fe Nanocomposites., Li He Jan 1998

Processing, Microstructures, And Properties Of Cu-Fe Nanocomposites., Li He

LSU Historical Dissertations and Theses

A new route has been developed to produce full-density, bulk, two-phase nanocomposites. Nanocrystalline, single-phase, fcc or bcc Cu$\sb{\rm 100-x}$Fe$\sb{\rm x}$ (x = 0 to 100) solid solution precursors were obtained by mechanical alloying of Cu and Fe at room temperature or liquid nitrogen temperature. These supersaturated solid solutions were decomposed on nanoscale upon hot consolidation, forming Cu-Fe two-phase nanocomposites in situ. Fully dense composite specimens have been obtained using either unconstrained or constrained sinter forging for the entire composition range (x = 0 to 100). The microstructures of the consolidated nanocomposites at representative second-phase volume fractions (x = 60, 85, …

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Multi-Institutional Collaborations In Science: Structure, Types, And Outcomes., Ivan Mihailov Chompalov Jan 1998

Multi-Institutional Collaborations In Science: Structure, Types, And Outcomes., Ivan Mihailov Chompalov

LSU Historical Dissertations and Theses

The advent of modern "big science" brings about a new kind of research formation: multi-institutional collaborations involving teams of researchers from several organizations. Despite their recent proliferation and visibility, no general classification of these "virtual organizations" exists. This study adopts a macrosociological, comparative perspective to develop a variety of classification schemes that capture the systematic variation of interorganizational collaborations in science along basic structural dimensions and to examine the relationships of these classifications with important sociological outcomes. Qualitative, historical analysis of collaborations in high-energy physics, space science, and geophysics showed that, when we set aside field-specific differences, seven general dimensions …

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Logistic Regression And Item Response Theory: Estimation Item And Ability Parameters By Using Logistic Regression In Irt., Necati Engec Jan 1998

Logistic Regression And Item Response Theory: Estimation Item And Ability Parameters By Using Logistic Regression In Irt., Necati Engec

LSU Historical Dissertations and Theses

The purpose of this study was to investigate the utility of logistic regression procedures as a means of estimating item and ability parameters in unidimensional and multidimensional item response theory models for dichotomous and polytomous data instead of IRT models. Unlike the IRT models, single logistic regression model can be easily extended from unidimensional models to multidimensional models, from dichotomous response data to polytomous response data and the assumptions such as all slopes are the same and intercept is zero are unnecessary. Based on the findings of this study, the following preliminary conclusions can be drawn: Item and ability parameters …

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A Validation Study Of The Assessment Of Dissimulation Scale Using Criminal And Civilly Committed Participants., Jill Suzanne Hayes Jan 1998

A Validation Study Of The Assessment Of Dissimulation Scale Using Criminal And Civilly Committed Participants., Jill Suzanne Hayes

LSU Historical Dissertations and Theses

Dissimulation malingering, unlike simulation malingering, refers to downplaying actual psychological difficulties in order to achieve secondary gain. Although several psychological tests have subscales designed to detect dissimulation, only the Assessment of Dissimulation Scale (ADS) has been specifically designed for this purpose. This screening instrument had limited usefulness, as it was validated only with college students. The purpose of this study was to determine whether the ADS was effective in detecting dissimulation in criminal and civilly committed populations which are likely to be the clinical targets for such a scale, and to establish a cut-off score on the ADS above which …

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Essays On Panel Unit Root Procedures: Applications To The Convergence Hypothesis, Ppp And Ucip., Kenan Lopcu Jan 1998

Essays On Panel Unit Root Procedures: Applications To The Convergence Hypothesis, Ppp And Ucip., Kenan Lopcu

LSU Historical Dissertations and Theses

The first two essays in this dissertation deal with the empirical examination of growth, specifically with the reexamination of convergence. The first essay introduces the issue and provides the preliminary results. Most of the empirical studies on the determinants of economic growth use cross-country analysis, employing long-term averages of relevant variables on each country. In these studies a negative relationship between average growth rates and initial incomes is interpreted as an indication of convergence in cross-country incomes and therefore, presented as evidence in support of neoclassical growth models. Such an analysis, however, ignores dynamic information that can explain part of …

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Evaluating The Impacts Of Farmer Participation In The Wetland Reserve Program On The Louisiana Economy Using I-O, Sam, And Cge As Alternative Modeling Techniques., Williams Olubodunde Olatubi Jan 1998

Evaluating The Impacts Of Farmer Participation In The Wetland Reserve Program On The Louisiana Economy Using I-O, Sam, And Cge As Alternative Modeling Techniques., Williams Olubodunde Olatubi

LSU Historical Dissertations and Theses

In the U.S., wetlands are one of the resources that have been adversely affected by development in agriculture. In response, and in order to protect wetlands as vital environmental resource, the federal government initiated several agriculture-related environmental protection programs, such as swamp buster, the Conservation Reserve Program (CRP), and the Wetlands Reserve Program (WRP). The WRP is an incentive-based program designed to encourage farmers to reconvert appropriate cropland to wetlands through subsidy payments. Because land is withdrawn from agricultural production, regions with relatively high participation rates, such as Louisiana, could experience adverse economic impacts from the program. As of August …

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Effects Of Anesthesia And Potential Antispastic Agents In An Experimental Model Of Spasticity., Heather Colleen Mosser Jan 1998

Effects Of Anesthesia And Potential Antispastic Agents In An Experimental Model Of Spasticity., Heather Colleen Mosser

LSU Historical Dissertations and Theses

Spasticity is a common motor disorder in spinal cord injured-patients. Therapeutic agents used to treat the motor abnormalities exist but are often unsatisfactory. Tests of potential pharmacotherapies are routinely conducted in anesthetized intact or acutely spinal animals, conditions which do not accurately simulate the human situation. The purpose of this dissertation was to develop, validate and use the chronic spinal rat as a model of spasticity that closely approximates the human spastic syndrome to evaluate antispastic agents. The main goals of this research project were to: (1) demonstrate the development of spasticity in the chronic spinal rat; (2) determine effects …

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Questions About Behavioral Function (Qabf): A Behavioral Checklist For Functional Assessment Of Aberrant Behavior., Theodosia Renata Paclawskyj Jan 1998

Questions About Behavioral Function (Qabf): A Behavioral Checklist For Functional Assessment Of Aberrant Behavior., Theodosia Renata Paclawskyj

LSU Historical Dissertations and Theses

Functional assessment is a tool in behavior therapy used to identify the functional relationships between a behavior of interest and the individual's environment. A functional assessment identifies variables that both occasion and maintain a particular behavior. Traditional functional assessment methodologies have relied on experimental techniques in which analog sessions are designed to mimic situations in the individual's environment. However, these techniques are time-consuming, require extensive training, and rely on the availability of numerous resources in the individual's setting. Development of a brief functional assessment checklist would circumvent these difficulties and make a significant contribution to applied behavioral psychology. The proposed …

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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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An Investigation Of Worry And Its Relationship To Anxiety In A Non-Clinical Sample Of Adolescents., Denise Adair Powers Jan 1998

An Investigation Of Worry And Its Relationship To Anxiety In A Non-Clinical Sample Of Adolescents., Denise Adair Powers

LSU Historical Dissertations and Theses

The overall purpose of this study was to examine the relationship between worry and anxiety in a community sample of adolescents. As no psychometrically sound instruments for measuring parameters of worry in adolescents exist, the first purpose of this study was to devise a reliable and valid measure of worry for this population. The Worry Inventory for Adolescents (WIA) was administered to 606 adolescents between the ages of 11 and 18. Based on the factor analysis, the WIA was divided into twelve factors and yielded two scores, Number of Worries and Worry Severity. The WIA demonstrated good internal consistency, moderate …

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Prevention Of Hydrolytic And Oxidative Rancidity And Nutrient Losses In Rice Bran During Storage., Fatemeh Malekian Ramezanzadeh Jan 1998

Prevention Of Hydrolytic And Oxidative Rancidity And Nutrient Losses In Rice Bran During Storage., Fatemeh Malekian Ramezanzadeh

LSU Historical Dissertations and Theses

Freshly milled raw rice bran was stabilized with microwave heat for 3 min. Half of raw and treated bran were packed in Ziplock(c) bags and the other half vacuum packed. Half of the samples were stored at 4--5°C and the other half at 25°C for 16 weeks. The free fatty acid (FFA) content increased rapidly in raw rice bran samples vacuum packed and samples packed in Ziplock(c) bags store at 25°C from an initial amount of 2.5% to 54.3% and 48.1%, respectively. FFA level increased significantly in raw samples vacuum packed and packed in Ziplock (c) bags stored 4--5°C from …

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