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1997

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Waterborne Materials Exchange Between Marshes And Open Water Of The Barataria Bay Estuary Of Louisiana, United States Of America., Ronald John Rovansek Jan 1997

Waterborne Materials Exchange Between Marshes And Open Water Of The Barataria Bay Estuary Of Louisiana, United States Of America., Ronald John Rovansek

LSU Historical Dissertations and Theses

The exchange of carbon, sediment, and water between brackish marshes and a shallow, fine-grained bay of the Barataria Bay Estuary were examined in order to quantify the production, transport, and storage of carbon in the Barataria Basin. Factors controlling these exchanges were identified and measured. Flux of suspended sediments through a tidal bayou connecting marshes and open waters were measured throughout the year and during a variety of weather events. Discharge of porewater from the marsh substrate to surrounding waters via subsurface flows and surficial drainage channels were measured. Constituent concentrations in the marsh runoff were monitored and used to …

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The Evolution Of Landscapes And Lineages In Pitcher Plants And Their Moths., Margaret Ellen Oard Jan 1997

The Evolution Of Landscapes And Lineages In Pitcher Plants And Their Moths., Margaret Ellen Oard

LSU Historical Dissertations and Theses

Pitcher plants and pitcher plant moths exhibit two prominent themes in the long evolutionary history between plants and insects. These themes are carnivory and herbivory. In pitcher plants, the leaf has been modified into an elegant pitfall trap enabling these plants to subsist at both the producer and consumer trophic levels. Of the numerous insect species intimately associated with pitcher plants, pitcher plant moths are the only inquilines which have evolved the capacity to disrupt both the carnivore and photosynthetic functions of the host plant. The carnivorous habit, considered an adaptation for nutrient deficient environments, has contributed to species radiations …

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Chemical Vapor Deposition Of Copper Films., Narendra Shamkant Borgharkar Jan 1997

Chemical Vapor Deposition Of Copper Films., Narendra Shamkant Borgharkar

LSU Historical Dissertations and Theses

We have studied the kinetics of copper chemical vapor deposition (CVD) for interconnect metallization using hydrogen (H$\sb2$) reduction of the Cu(hfac)$\sb2$ (copper(II) hexafluoroacetylacetonate) precursor. Steady-state deposition rates were measured using a hot-wall microbalance reactor. For base case conditions of 2 Torr Cu(hfac)$\sb2$, 40 Torr H$\sb2$, and 300$\sp\circ$C, a growth rate of 0.5 mg cm$\sp{-2}$ hr$\sp{-1}$ (ca. 10 nm min$\sp{-1}$) is observed. Reaction order experiments suggest that the deposition rate passes through a maximum at partial pressure of 2 Torr of Cu(hfac)$\sb2$. The deposition rate has an overall half-order dependence on H$\sb2$ partial pressure. A Langmuir-Hinshelwood rate expression is used to …

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A Computer Automated, Hydraulically Integrated Serial Turbidostat Algal Reactor (Histar): Mathematical Modeling And Experimental Analysis., Chandra Sekhar Theegala Jan 1997

A Computer Automated, Hydraulically Integrated Serial Turbidostat Algal Reactor (Histar): Mathematical Modeling And Experimental Analysis., Chandra Sekhar Theegala

LSU Historical Dissertations and Theses

Conceptually, the Hydraulically Integrated Serial Turbidostat Algal Reactor (HISTAR) has two components: (1) sealed turbidostats for producing a high quality algal inoculum, and (2) a series of unprotected inter-connected continuous flow stirred tank reactors (CFSTRs) for mass producing algae under approximated plug flow conditions. The hydraulic retention time of each individual CFSTR ($\theta\sb{\rm n})$ is set low enough (dilution is set high) that any suspended organisms (both contaminants and desired algae) entering the CFSTR would be washed to the next CFSTR well within their doubling time. However, as the turbidostats are employed to inoculate the first CFSTR on an almost …

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A Study Of The Effect Of Energetic Flux Bombardment On Intensified Plasma-Assisted Processing., Albert Amatey Adjaottor Jan 1997

A Study Of The Effect Of Energetic Flux Bombardment On Intensified Plasma-Assisted Processing., Albert Amatey Adjaottor

LSU Historical Dissertations and Theses

An investigation of the plasma nitriding mechanism under intensified conditions (average particle energy up to 1200 eV) was carried out using a triode configuration. The significance of the different physical processes taking place during intensified plasma nitriding, such as sputtering, implantation, defect generation, redeposition and diffusion were investigated experimentally, while theoretical predictions were obtained by using the TRIM (transport of ions in matter) code. A titanium-base alloy was selected as the substrate material. Sputtering yield in an inert atmosphere was found to exhibit three regimes as a function of incoming particle energy. The low energy and high energy regimes were …

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The Impact Of Technological Change On The Economic Viability Of Individual Production Centers: The Case Of The 1840-1880 British Ocean-Going Iron And Steam Shipbuilding Industry., Daniel Stephen Allen Jan 1997

The Impact Of Technological Change On The Economic Viability Of Individual Production Centers: The Case Of The 1840-1880 British Ocean-Going Iron And Steam Shipbuilding Industry., Daniel Stephen Allen

LSU Historical Dissertations and Theses

This dissertation examines the relationship between technological change and spatial industrial restructuring through a case study of the 1840-1880 British ocean-going iron and steam shipbuilding industry. The study tests the hypothesis that a shipbuilding center's share of the national British shipbuilding market was associated with its ability to generate or rapidly adopt technological change. The study begins by establishing iron steamship technological changes introduced by British shipbuilders and the industry's attendant spatial restructuring It then develops two site-specific variables: industrial viability and innovative ability. Data for both variables are obtained from the Lloyds Register of British and Foreign Shipping. The …

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The Effects Of The Louisiana Systemic Initiative Project On Two Rural School Districts In Louisiana., Tanya Maria Jones Jan 1997

The Effects Of The Louisiana Systemic Initiative Project On Two Rural School Districts In Louisiana., Tanya Maria Jones

LSU Historical Dissertations and Theses

This study provides a description and analysis of the effects of a mathematics reform initiative on classrooms in two rural communities. It describes the sites, details interactions that take place in the classroom, and enumerates teachers' perceptions of the change. A mixed methodology was used to support the findings. Qualitative data were collected through classroom observations and interviews and quantitative data were gathered through questionnaires. Quantitative results indicated that teachers who participate in the training have the opportunity to learn more about new teaching strategies in mathematics and are likely to change their teaching practices in mathematics. Findings reflected that …

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Teacher Conceptions And The Curriculum: A Longitudinal, Multicase Study Of College Chemistry Teaching., Charles J. Killebrew Jan 1997

Teacher Conceptions And The Curriculum: A Longitudinal, Multicase Study Of College Chemistry Teaching., Charles J. Killebrew

LSU Historical Dissertations and Theses

Strategic innovations and interventions to reform college science teaching will be required to promote the retention and achievement of those students who might otherwise elect to defect at the entry-level courses. The extent to which this can be achieved will depend upon educational research into ways that the science curriculum can be restructured to accomplish the dual function of enhancing science literacy while promoting recruitment to scientific careers. To explore these issues, four introductory college chemistry classes were observed over a period of two years. The classes were designated either as traditional or conceptual. Selection into these categories was based …

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Feedback Linearizing Control Strategies For Chemical Engineering Applications., Michael James Kurtz Jan 1997

Feedback Linearizing Control Strategies For Chemical Engineering Applications., Michael James Kurtz

LSU Historical Dissertations and Theses

Two widely studied control techniques which compensate for process nonlinearities are feedback linearization (FBL) and nonlinear model predictive control (NMPC). Feedback linearization has a low computational requirement but provides no means to explicitly handle constraints which are important in the chemical process industry. Nonlinear model predictive control provides explicit constraint compensation but only at the expense of high computational requirements. Both techniques suffer from the need for full-state feedback and may have high sensitivities to disturbances. The main work of this dissertation is to eliminate some of the disadvantages associated with FBL techniques. The computation time associated with solving a …

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Design And Analysis Of Optical Interconnection Networks For Parallel Computation., Yueming Li Jan 1997

Design And Analysis Of Optical Interconnection Networks For Parallel Computation., Yueming Li

LSU Historical Dissertations and Theses

In this doctoral research, we propose several novel protocols and topologies for the interconnection of massively parallel processors. These new technologies achieve considerable improvements in system performance and structure simplicity. Currently, synchronous protocols are used in optical TDM buses. The major disadvantage of a synchronous protocol is the waste of packet slots. To offset this inherent drawback of synchronous TDM, a pipelined asynchronous TDM optical bus is proposed. The simulation results show that the performance of the proposed bus is significantly better than that of known pipelined synchronous TDM optical buses. Practically, the computation power of the plain TDM protocol …

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Tribological Behavior Of Duplex Nitrogen Diffusion/Dlc Coating Treatments., Yan Liu Jan 1997

Tribological Behavior Of Duplex Nitrogen Diffusion/Dlc Coating Treatments., Yan Liu

LSU Historical Dissertations and Theses

Diamond-like carbon (DLC) coatings have high potential for developing advanced tribological systems and the overall objective of the present research is to provide a framework to theoretically design and experimentally develop and study such systems of interest. The present research concentrates on the following specific aspects: the fundamental wear mechanism of DLC coatings; finite element (FE) modeling to understand the stress distribution in coating/substrate system under indentation and friction; and the influence of graded interface on the tribological behavior of DLC coatings. The experimental results showed that DLC films possess low friction coefficient ($f\sb{init}$: 0.12-0.20, $f\sb{fin}$: 0.06-0.08) and low wear …

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Numerical Simulation Of Geosynthetic Reinforced Earth Structures Using Finite Element Method., Surajit Pal Jan 1997

Numerical Simulation Of Geosynthetic Reinforced Earth Structures Using Finite Element Method., Surajit Pal

LSU Historical Dissertations and Theses

Geosynthetics are widely used as reinforcements in various earth structures. Current design methods are based on some simplified assumptions and are primarily modified versions of limit equilibrium methods used in design of the unreinforced earth structures. All of these design methods are conservative and result in uneconomical design. The best method for verifying the design assumptions and studying the stress-deformation behavior of geosynthetic reinforced earth structures is by constructing a series of large scale test walls with adequate instrumentation and collecting data from them. But the cost involved in such a scheme precludes undertaking this kind of study. Thus Numerical …

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Nursing Fathers: American Colonists' Conception Of English Protestant Kingship., Benjamin Lewis Price Jan 1997

Nursing Fathers: American Colonists' Conception Of English Protestant Kingship., Benjamin Lewis Price

LSU Historical Dissertations and Theses

This dissertation traces the development of the concept of English Protestant kingship within the political culture of colonial America from the Glorious Revolution of 1688 to the beginning of the American Revolution. It is meant to illustrate the place of British kings within the structure and ideology of American colonial politics and society during that period. It illustrates Americans' understanding of the protection-allegiance relationship between English Protestant kings, especially the first two Hanoverian monarchs, and their subjects in the provinces of North America. This study also explores the language of Whig political discourse with its two primary "dialects" of Court …

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Vegetation, Soils, And Hydrology Of Central Louisiana Bottomland Hardwood Forest Types., William Brown Patterson Jan 1997

Vegetation, Soils, And Hydrology Of Central Louisiana Bottomland Hardwood Forest Types., William Brown Patterson

LSU Historical Dissertations and Theses

Wetland delineation in bottomland hardwood forests is controversial due to uncertainty of the duration of inundation and soil saturation on seasonally dry sites. Wetland delineation requires an assessment of hydrophytic vegetation, hydric soils, and wetland hydrology. The objectives were to: (i) classify forest types in five Wildlife Management Areas in central Louisiana within Sharkey clay and Fausse clay soil mapping units, (ii) compare site and soil variables between the forest types, (iii) evaluate relationships between tree species distributions and soil/site factors, (iv) characterize soils in the study area, (v) evaluate differences in forest types for durations of inundation, soil saturation, …

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Determination Of Hydrocarbon Type From The Dual-Spaced Neutron Tool Responses., Luis Fernando Quintero Jan 1997

Determination Of Hydrocarbon Type From The Dual-Spaced Neutron Tool Responses., Luis Fernando Quintero

LSU Historical Dissertations and Theses

A new interpretation method that allows for the determination of the fluid type present in a formation of interest was developed. The new method is referred to as the "Three Neutron Porosity Log". The method is based on an algorithm that determines three apparent neutron porosities. These porosities, derived from the raw counts of the dual-spaced neutron tool, have three different radii of investigation. All three neutron porosities, near, far, and ratio, when properly calibrated read the true porosity in water-bearing zones. In oil or gas-bearing zones the mud filtrate invasion profile will cause the three apparent neutron porosities to …

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Evaluation Of Alternative Gases For Immiscible Cyclic Injection., Sara Shayegi Jan 1997

Evaluation Of Alternative Gases For Immiscible Cyclic Injection., Sara Shayegi

LSU Historical Dissertations and Theses

Cyclic gas injection processes have been primarily restricted to the use of pure CO$\sb2$ or CO$\sb2$ that has been slightly contaminated with reservoir gases. However, it is difficult to employ CO$\sb2$ in certain circumstances due to transport, economic, or corrosion problems. This study presents the results of laboratory investigations of the cyclic gas injection process using methane, nitrogen and combinations of these gases with CO$\sb2$. Cyclic gas injections were performed at immiscible conditions in consolidated sandstone cores that contained waterflood residual oil under analogous conditions to previous cyclic CO$\sb2$ injections for comparative purposes. Pure methane recovered approximately the same amount …

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Injection Of Species Under Electrical Field To Enhance Bioremediation., Fazle Rabbi Jan 1997

Injection Of Species Under Electrical Field To Enhance Bioremediation., Fazle Rabbi

LSU Historical Dissertations and Theses

Electrokinetics is one of the most viable alternatives for injecting/extracting water, organic and ionic species in low permeability soils as well as heterogeneous media because the transport processes are independent of the pore sizes. A better understanding of the principles offers the opportunity to employ multi-component species transport under electrical fields to inject electron acceptors, nutrients and other process additives for enhancement of in-situ bioremediation in low permeability and heterogeneous media. This study assesses the potential to employ and exploit the principles of multi-component species transport under electrical fields as mean to supplement, enhance and engineer in-situ bioremediation. It was …

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Orientation Effects On African-American Engineering Students: The Lsu Case., Forest Dent Smith Jan 1997

Orientation Effects On African-American Engineering Students: The Lsu Case., Forest Dent Smith

LSU Historical Dissertations and Theses

Extended orientation courses continue to be introduced as curriculum offerings that assist students to persist in post-secondary institutions. Research on the outcomes of such courses in terms of student retention and achievement is, with regard to race, however, not proceeding at the same pace as orientation course research in general. The purpose of this study was to apply the attrition models of Tinto (1987) and Pascarella, Terenzini, and Wolfe (1986) and examine extended orientation as a contributing factor to the retention and achievement of African-American engineering students. The sample of the study consisted of 354 African-American students who were members …

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Traffic Management And Congestion Control In The Atm Network Model., Sundararajan Vedantham Jan 1997

Traffic Management And Congestion Control In The Atm Network Model., Sundararajan Vedantham

LSU Historical Dissertations and Theses

Asynchronous Transfer Mode (ATM) networking technology has been chosen by the International Telegraph and Telephony Consultative Committee (CCITT) for use on future local as well as wide area networks to handle traffic types of a wide range. It is a cell based network architecture that resembles circuit switched networks, providing Quality of Service (QoS) guarantees not normally found on data networks. Although the specifications for the architecture have been continuously evolving, traffic congestion management techniques for ATM networks have not been very well defined yet. This thesis studies the traffic management problem in detail, provides some theoretical understanding and presents …

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Coastal Restoration Using Pipeline-Conveyed Sediments., Catherine Faith Voisin Jan 1997

Coastal Restoration Using Pipeline-Conveyed Sediments., Catherine Faith Voisin

LSU Historical Dissertations and Theses

A spreadsheet program was successfully developed which determines the engineering requirements for pipeline transport of sediments from dredge sites to wetland restorations sites. The program called SLURRY.XLS involves several new correlations. A new correlation for determining the critical velocity of particle transport is presented. New correlations were statistically developed for determining the drag coefficient of particles. The spreadsheet also successfully determines settling velocities of the individual particle sizes in any settling regime. A second spreadsheet program entitled "CONSOL.XLS" uses geotechnical principles of consolidation for determining marsh surface elevation with and without hydraulic fill versus time. The CONSOL.XLS program permits the …

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Feature-Based Models For Three-Dimensional Data Fitting., Gregory Todd Dobson Jan 1997

Feature-Based Models For Three-Dimensional Data Fitting., Gregory Todd Dobson

LSU Historical Dissertations and Theses

There are numerous techniques available for fitting a surface to any supplied data set. The feature-based modeling technique takes advantage of the known, geometric shape of the data by deforming a model having this generic shape to approximate the data. The model is constructed as a rational B-spline surface with characteristic features superimposed on its definition. The first step in the fitting process is to align the model with a data set using the center of mass, principal axes and/or landmarks. Using this initial orientation, the position, rotation and scale parameters are optimized using a Newton-type optimization of a least …

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A Case-Ready Modified-Atmosphere Packaging System For Beef., Brian Scott Smith Jan 1997

A Case-Ready Modified-Atmosphere Packaging System For Beef., Brian Scott Smith

LSU Historical Dissertations and Theses

Beef tenderness and color stability were evaluated in conventional and modified atmosphere packaging (MAP) systems. Equal portions of inside rounds removed immediately (PM0) or at 48 h postmortem (PM48) were vacuum packaged (VP) whole or cut into steaks and packaged in 80%N$\sb2$:20%CO$\sb2$ MAP. On day 12, MAP environments were exchanged for 80%O$\sb2$:20%CO$\sb2$. Calpastatin activity was lower at 2 d postmortem for PM48 steaks than PM0 steaks. Electrophoresis indicated more degradation of 50 and $>$250 kDA compounds at 2 d postmortem for PM48 than PM0 steaks. Steaks from PM48 required less shear force than PM0 steaks. HunterLab 'L', 'a' and …

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The Production Of Glucooligosaccharides By Leuconostoc Mesenteroides Atcc 13146 And Lipomyces Starkeyi Atcc 74054., Sun Kyun Yoo Jan 1997

The Production Of Glucooligosaccharides By Leuconostoc Mesenteroides Atcc 13146 And Lipomyces Starkeyi Atcc 74054., Sun Kyun Yoo

LSU Historical Dissertations and Theses

Glucooligosaccharides of less than DP 10 were produced either by mixed cultures of Leuconostoc mesenteroides ATCC 13146 and L. starkeyi ATCC 74054, or by an acceptor reaction produced by Leuconostoc mesenteroides ATCC 13146. The yields of glucooligosaccharides produced by mixed culture and acceptor reaction reached up to 49 and 90% of theoretical yield. The composition of carbohydrates at the end of fermentation by mixed culture was 31.4% oligosaccharides, 17.6% dextran, 31.4% mannitol, 2.1% fructose, and 2.4% of sucrose. The composition of carbohydrates at the end of fermentation by acceptor reaction was 32.7% pannose, 30.4% branched isomaltotetraose (DP 4), 21.7% branched …

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Coastal Management Regarding Beach And Dune Protection: An Exploratory Analysis., Melissa Lee Gordon Jan 1997

Coastal Management Regarding Beach And Dune Protection: An Exploratory Analysis., Melissa Lee Gordon

LSU Historical Dissertations and Theses

The Congressional declaration of national coastal policy in Section 303 of the Federal Coastal Zone Management Act (CZMA) of 1972 charges the coastal states to meet the objective of coastal resource protection. At this time, when the appropriate mix of authority between federal and state governments concerning environmental regulations is in debate; it is important to determine whether the inter-governmental partnership created by CZMA is effective in protecting coastal resources. This research is an exploratory analysis of coastal management regarding beach and dune protection within the twenty-four coastal states. The dissertation objectives are as follows: (1) determine the level of …

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An Identification Of Primary Evaluands As Perceived By Undergraduate Students And Faculty In A College Of Agriculture., Karen Renee Juneau Jan 1997

An Identification Of Primary Evaluands As Perceived By Undergraduate Students And Faculty In A College Of Agriculture., Karen Renee Juneau

LSU Historical Dissertations and Theses

This study determined appropriate evaluands for a College of Agriculture based on the perceptions of two shareholder groups of the college, the faculty and undergraduate students. Student opinions about their college experiences appeared related to the goals and influences that prompted them to attend college. These goals and influences determined what they expected from their college experience. There were three parts to the study; a pilot study, an undergraduate student study and a faculty study. Undergraduate students were classified based on two break points, gender and nontraditional/traditional student status. There were four focus groups conducted for the study and fourteen …

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Linear Matrix Inequality Approach To Robust Emergency Lateral Control Of A Highway Vehicle With Time-Varying Uncertainties., Robert Edward Benton Jr Jan 1997

Linear Matrix Inequality Approach To Robust Emergency Lateral Control Of A Highway Vehicle With Time-Varying Uncertainties., Robert Edward Benton Jr

LSU Historical Dissertations and Theses

New linear-matrix-inequality (LMI) based methods are developed for the static-output-feedback stabilization and reduced-gain static-output-feedback stabilization of time-invariant systems. Unlike previous methods, the static-output-feedback method is non-iterative in LMI solutions. The methods are extended to design robust static-output-feedback controllers for time-varying systems using a polytopic-systems approach. Examples are given which demonstrate the use of each of the new methods. The specific problem of emergency lateral control of a highway vehicle is then addressed using the new robust static-output-feedback method. A controller is designed which robustly stabilizes the vehicle over the range of highway speeds (15 to 30 m/s) and a range …

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Development Of Thin Gold Film Thermal Sensors For Synchrotron X-Ray Exposure Diagnostics., Harish M. Manohara Jan 1997

Development Of Thin Gold Film Thermal Sensors For Synchrotron X-Ray Exposure Diagnostics., Harish M. Manohara

LSU Historical Dissertations and Theses

High aspect ratio lithography utilizes high intensity exposure sources, such as synchrotron storage rings, to deposit sufficient dose in the resist to produce a successful pattern transfer. Such highly powerful sources are known to cause undesirable thermal effects in the mask-resist-substrate system. Hence, the measurement of temperature of a mask-resist-substrate system during irradiation is an important exposure diagnostic feature. Deposition of a reasonably accurate dose in the resist is controlled by knowledge of the exposure source intensity. Periodic monitoring of the synchrotron radiation beam power and its spatial distribution at the exposure plane is necessary. In this research, diagnostic techniques …

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A Comparison Of Leonard Bernstein's Incidental Music For The Film "On The Waterfront" And The Subsequent "Symphonic Suite" For The Film, And An Original Composition: Symphony No. 1: "Music For Theater"., Stephen John Lias Jan 1997

A Comparison Of Leonard Bernstein's Incidental Music For The Film "On The Waterfront" And The Subsequent "Symphonic Suite" For The Film, And An Original Composition: Symphony No. 1: "Music For Theater"., Stephen John Lias

LSU Historical Dissertations and Theses

The first portion of this dissertation compares Leonard Bernstein's incidental music to the film On the Waterfront with the subsequent concert suite that was derived from this score. By exploring the content of the film score, as well as the manner in which this music was adapted for the suite, some excellent insight can be gained into Bernstein's approach to both works, as well as the many requirements that the cinematic idiom places on the composer. Special attention is paid to the degree to which the dramatic content of the film influenced the construction of the incidental music. In the …

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Acid Solubilization Of Fish Protein For Production Of Protein Hydrolysate., Ercument Ozer Jan 1997

Acid Solubilization Of Fish Protein For Production Of Protein Hydrolysate., Ercument Ozer

LSU Historical Dissertations and Theses

The mechanism of fish protein solubilization by acid hydrolysis at elevated temperatures was investigated. Rate expressions for the solubilization were determined using pilot scale data with two different rate determination methods. A postulated mechanism was verified and estimated rates were evaluated on five independent verification experiments. A functional relationship between nonprotein byproduct concentration and whiteness of fish protein hydrolysate (FPH) was developed. Initial and set-point operating variables were calculated to produce FPH with acceptable color characteristics for food use. A batch reactor was used for duplicate hydrolysis trials conducted at three acid and three temperature levels for four hours. Samples …

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Wood Fiber Reinforced Polypropylene Composites., Minqiu Lu Jan 1997

Wood Fiber Reinforced Polypropylene Composites., Minqiu Lu

LSU Historical Dissertations and Theses

Mechanical properties of polypropylene (PP)/wood fiber composites depend not only on the properties of each primary component but also on a complex interaction of several factors such as fiber loading and size, characteristics of fiber-polymer matrix interface, and the processing conditions. Both sequential and simultaneous composites are formulated in this research. First, sequential composites are made by compounding wood fibers with PP in the presence of maleated polypropylene (MPP) as a coupling agent in a twin-screw extruder. A small amount of MPP (1 wt%) present in these sequential composites can increase the tensile strength of the composites significantly. The tensile …

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