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Fundamental Studies Of Capillary Electroosmosis And Electrokinetic Removal Of Phenol From Kaolinite., Heyi Li

LSU Historical Dissertations and Theses

Capillary electroosmosis is an important factor in capillary zone electrophoresis (CZE) and micellar electrokinetic capillary chromatography (MECC). A new application of electrokinetic phenomena in environmental science is electrokinetic soil processing, which is an emerging technique with the capability to decontaminate polluted soils. Chapter 1 discusses the fundamental theory behind electroosmosis, CZE, MECC, and electrokinetic soil processing. In chapter 2, the surface conductances of different concentrations of KCl solutions in 50 and 100 $\mu$m capillaries were measured using an AC method, to attempt to characterize capillary double layers. With increase of KCl concentration, the surface conductance increases. Chapter 3 involves fundamental …

An Adaptive Finite Element Methodology For The High-Performance Computer Simulation Of Multiphase Flow Processes., Donald J. Morton Jr

LSU Historical Dissertations and Theses

A methodology has been developed for the computer simulation of multiphase flow processes in porous media. The solutions to the nonlinear equations describing these processes are approximated by Galerkin's method on the spatial dimensions and the finite difference method on the temporal dimension. Due to the transient nature of discontinuities in the spatial domain, dynamic mesh refinement (and unrefinement) techniques, based on the maintenance of a 1-irregular mesh, are employed on a two dimensional mesh to produce fine resolution in regions of activity and coarse resolution elsewhere. Our unique approach is tested by comparing computed results with data from laboratory …

Geographical Factors Influencing The Rise And Growth Of Cotton Textile Manufacturing In The South Carolina Piedmont, 1880-1940. (Volumes I And Ii)., Gregory John Labyak

LSU Historical Dissertations and Theses

Despite the South's defeat in the Civil War and the economic hardships occasioned by the conflict and its aftermath, Southerners possessed the resources and the enthusiasm to undertake an industrial campaign that greatly altered the economic course of their region. Industrial development in the South, centered largely on cotton textiles, focused on the Piedmont. The area possessed several advantages over other Southern subregions as a center of cotton manufacturing, but it failed to supply all of the raw material, capital, and labor needed by the rapidly-growing industry. This study examines the progress of cotton textile manufacturing in the South Carolina …

A New Method For Efficient Parallel Solution Of Large Linear Systems On A Simd Processor., Okon Hanson Akpan

LSU Historical Dissertations and Theses

This dissertation proposes a new technique for efficient parallel solution of very large linear systems of equations on a SIMD processor. The model problem used to investigate both the efficiency and applicability of the technique was of a regular structure with semi-bandwidth $\beta,$ and resulted from approximation of a second order, two-dimensional elliptic equation on a regular domain under the Dirichlet and periodic boundary conditions. With only slight modifications, chiefly to properly account for the mathematical effects of varying bandwidths, the technique can be extended to encompass solution of any regular, banded systems. The computational model used was the MasPar …

Connectivity For Matroids And Graphs., Haidong Wu

LSU Historical Dissertations and Theses

This dissertation studies connectivity for matroids and graphs. The main results generalize Tutte's Wheels and Whirls Theorem and have numerous applications. In Chapter 2, we prove two structural theorems for 3-connected matroids. An element e of a 3-connected matroid M is essential if neither the deletion M$\\$e nor the contraction M/e is 3-connected. Tutte's Wheels and Whirls Theorem proves that the only 3-connected matroids in which every element is essential are the wheels and whirls. If M is not a wheel or a whirl, we prove that the essential elements of M can be partitioned into classes where two elements …

Reservoir Performance History Matching Using Type-Curves., Jeffrey Guy Callard

LSU Historical Dissertations and Theses

Recently, decline-curve analysis has expanded to permit engineers to analyze a petroleum reservoir directly in regard to its fluid-flow characteristics and its volumetric extent using rate-time type-curves of the constant terminal pressure solution of the diffusivity equation. This analysis is of enormous value to reservoir managers whose goal is to maximize oil and gas production from a petroleum reservoir. Reservoir extent, continuity, and flow capacity are paramount characteristics that are considered when developing models that predict reservoir performance while using alternative depletion strategies, such as during fluid-injection projects or enhanced recovery. Reservoir producing conditions to which this technique can be …

Traction And Agricultural Tractor Tire Selection Studies., Francois Pascal Brassart

LSU Historical Dissertations and Theses

A machine was built to study non-rolling tire stiffness and damping coefficients of agricultural tractor tires in the vertical direction. Static deflection on a rigid surface was measured as a function of vertical load. During dynamic experiments, a sinusoidal forcing function was imposed on the test tire to determine dynamic stiffness and damping coefficient from load and deflection measurements. The experimental setup and methodology are described. Ten tires were tested. Both static and dynamic stiffnesses appeared linearly related to inflation pressure. No correlation was found between dynamic properties and excitation frequency. Comparisons among stiffness and damping coefficient values were made …

Intraspecific Variation In The Response Of Baldcypress (Taxodium Distichum) Seedlings To Salinity., James Andrew Allen

LSU Historical Dissertations and Theses

This study evaluated genotypic variation in responses of baldcypress (Taxodium distichum) seedlings to combined flooding and salinity stress. Two experiments form the core of this dissertation. In the first experiment, seedlings of 15 open-pollinated families of baldcypress were exposed to combined salinity and flooding stress under greenhouse conditions. Ten of the families were from coastal locations that were slightly brackish. The other families were from freshwater locations. Five salinity levels were investigated--0, 2, 4, 6, and 8 g l$\sp{-1}$ artificial seawater--all with shallow flooding. Substantial variation was found among salinity levels and families for most of the response variables assessed. …

A Confederate Education In The New South: Southern Academia And The Idea Of Progress In The Nineteenth Century., Danny Ray Frost

LSU Historical Dissertations and Theses

The idea of progress inspired former Confederate officers who entered academia to transform Southern higher education from its antebellum classical and republican orientation to a postbellum focus on science and utility. Defeat taught these academics that Southern institutions had failed to supply graduates with the scientific skills necessary to compete economically, industrially, and militarily with the North. They concluded that the Confederacy's collapse demonstrated the necessity of abandoning the republican conception of progress, characterized by fears of cyclical decay, in favor of the modern idea of progress which emphasized inevitable and unlimited material and social improvement. Confederate-veterans-turned academics believed scientific …

Transcriptional Cis-Regulatory Elements And Trans-Factors Of A Gene For The Seed Storage Protein Beta-Phaseolin From Common Bean (Phaseolus Vulgaris)., Yasushi Kawagoe

LSU Historical Dissertations and Theses

In many dicotyledons, the nutrient reserves are stored in the cotyledons. Phaseolin, 7S globulin, is the major seed protein from common bean Phaseolus vulgaris. In vitro transcription assays and gene transfer studies indicate that phaseolin gene expression is regulated primarily at the transcriptional level. In this dissertation, I studied cis- and trans-acting factors that may play a role in the transcriptional regulation of the $\beta$-phaseolin gene. Gel mobility shift and exonuclease III protection assays identified four distinct DNA binding proteins, CAN, AG-1, CA-1, and TATA-box binding protein. Three CANNTG motifs, CACGTG ($-$248/$-$243), CACCTG ($-$163/$-$158), and CATATG ($-$100/$-$95), were found to …

Tracking Dynamic Features In Image Sequences., Sankar Krishnamurthy

LSU Historical Dissertations and Theses

This dissertation deals with detecting and tracking dynamic features in image sequences using digital image analysis algorithms. The tracking problem is complicated in oceanographic images due to the dynamic nature of the features. Specifically, the features of interest move, change size and shape. In the first part of the dissertation, the design and development of a new segmentation algorithm, Histogram-based Morphological Edge Detector (HMED), is presented. Mathematical morphology has been used in the past to develop efficient and robust edge detectors. But these morphological edge detectors do not extract weak gradient edge pixels, and they introduce spurious edge pixels. The …

The Structure Of Abstracts: Stylistic And Structural Elements In 48 Scientific And Technical Abstracts., Timothy John Keogh

LSU Historical Dissertations and Theses

The purpose of this dissertation is to identify and account for the structural and stylistic features of 48 abstracts written by scientists and engineers at the research and development division of a large company. All of the abstracts were published in industry journals and conference papers during 1990 and 1991. The features identified in the abstracts are compared to the suggestions for structure and style found in fifteen textbooks frequently used in university technical writing courses. Textbook suggestions for structural features include purpose statement, scope, methods, results, conclusions, and recommendations. Textbook suggestions for stylistic features include eliminating unnecessary words, avoiding …

Physiological Variation In Loblolly Pine (Pinus Taeda L.) As Related To Crown Position And Stand Density., Dennis Albert Gravatt

LSU Historical Dissertations and Theses

Physiological parameters were measured under natural light conditions and needle orientation from towers and walkways erected in the crowns of loblolly pine (Pinus taeda L.) trees. Photosynthetic light response curves, chlorophyll content, nutrient content and specific leaf area were determined for current-year foliage on detached branches. Two silvicultural treatments were randomly assigned to the twelve plots in the fall of 1988. Plots were thinned to a density of 731 trees per hectare or left unthinned, at a density of 2990 trees per hectare. The plots were left unfertilized or fertilized with 744 kg per hectare of diammonium triple superphosphate was …

A Step In The "Wright" Direction: Mapping The Structural Locations Of The "New Class"., David Emile Maurer

LSU Historical Dissertations and Theses

Stratification researchers have directed their efforts toward tracing the emergence of and speculating about the composition of a New Class which is forming as American capitalism expands. In their endeavors, three sets of theories occupy center stage: Expert New Class theory, Managerial New Class theory, and New Working Class theory. To empirically test each of these theories, the 1991-1992 Class and Class Consciousness data set were employed. Of the three sets of theories, Managerial New Class models offer the most promise for future research and explaining the changing nature of the American social structure. Moderate support is also provided for …

An Evaluation Of Southern Region Sustainable Agriculture Research And Education (Sare) Program Proposals For The Period 1992-1994., Ellis Mbaka Njoka

LSU Historical Dissertations and Theses

The purpose of this study was to describe and compare funded and unfunded research proposals submitted to the Southern Region Sustainable Agriculture Research and Education Council between 1992 and 1994. Coding reliability and validity were assessed through a pilot study after which the actual coding was carried out. A census of 32 funded and a simple random sample of 54 unfunded proposals were used for this study. Descriptive statistics (frequencies) were used to describe research themes, sustainable agricultural practices, research categories, funds requested for research, origin of proposals, length of research period, research cooperators, and the occupation of principal investigators. …

A Water Balance Evaluation Of The Effects Of Climate Variability And Human Modification On The Flow Regime Of The Mississippi River, 1932-1988., Judy Lee Hoff

LSU Historical Dissertations and Theses

Human activities affecting runoff and streamflow within the Mississippi River drainage basin have been and continue to be significant. Since the disastrous flood of 1927, the U.S. Army Corps of Engineers has established an extensive regulatory system for flood control purposes and navigational benefits. Along with these river system modifications, significant landscape alterations have occurred within the basin as a result of cultural and economical development. In light of the dramatic Midwest flood of 1993, it becomes increasingly necessary to understand the comprehensive relationship between streamflow, climatic variability, and human-induced change within the overall drainage basin. A water balance methodology …

Observation Of Events With A Large Rapidity Gap In Deep Inelastic Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, S. Repond, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, C. Del Papa, F. Frasconi, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, Q. Lin

Faculty Publications

In deep inelastic, neutral current scattering of electrons and protons at s=296 GeV, we observe in the ZEUS detector events with a large rapidity gap in the hadronic final state. They occur in the region of small Bjorken x and are observed up to Q2 of 100 GeV2. They account for about 5% of the events with Q2≥10 GeV2. Their general properties are inconsistent with the dominant mechanism of deep inelastic scattering, where color is transferred between the scattered quark and the proton remnant, and suggest that the underlying production mechanism is the diffractive dissociation of the virtual photon. © …

Louisiana Agriculture Magazine, Fall 1993, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Collaborative Writing In Petroleum Engineering: A Case Study Of Petroleum Engineers In An Academic Setting, Michael Anne Coffey

LSU Historical Dissertations and Theses

Interest in collaborative writing has surged in composition studies since the mid-tolate 1980s; aspects addressed include motivation, the composing process, the kinds of participants, authorship, conflict, etc. Much composition research concentrates on collaboration in the workplace to gain an understanding of collaborative writing that can be readily transferred to the classroom and that can prepare students for the social, as opposed to solitary, act of writing—to encourage collaborative thought. In this study, I attempted to find out more about what occurs in the stages (prewriting, writing, post-writing) of collaborative writing. My subjects were petroleum engineers on university campuses. Departments were …

High-Order Harmonic Generation With Short-Pulse Lasers, Kenneth J. Schafer, Jeffrey L. Krause, Kenneth C. Kulander

Faculty Publications

Recent progress in the understanding of high-order harmonic conversion from atoms and ions exposed to high-intensity, short-pulse optical lasers is reviewed. We find that ions can produce harmonics comparable in strength to those obtained from neutral atoms, and that the emission extends to much higher order. Simple scaling laws for the strength of the harmonic emission and the maximum observable harmonic are suggested. These results imply that the photoemission observed in recent experiments in helium and neon contains contributions from ions as well as neutrals.

Cone Penetration In Cemented Deposits-A Field Study, Semih Arslan

LSU Historical Dissertations and Theses

Neglecting cementation results in an underestimation of slope stability and pile capacity in design and analysis of geotechnical engineering problems related to cemented deposits. Developing methods to identify and assess the engineering characteristics of cemented deposits is an important subject in geotechnical engineering.

This study is conducted to evaluate the reliability of the prediction schemes proposed by previous investigators through a field study of cone penetration in a cemented deposit and respective laboratory triaxial study on undisturbed cemented specimens. The effect of cementation on cone penetration resistance is investigated through the field study, and the effects of cementation on drained …

Faculty Senate Resolution 92-12, Louisiana State University And Agricultural & Mechanical College

LSU Faculty Senate Publications

Faculty Senate Resolution on proposal for Council of Policy Committee, adopted on May 7, 1993.

A Construction Heuristic For One-Dimensional Machine Location Problems, P. Sobhan Babu

LSU Historical Dissertations and Theses

The focus of this research is to develop a new heuristic for solving the one-dimensional machine location problem. The major objective is to assign a set of machines to different locations available along a material handling path, so that the total material handling distance (or time) is minimized. One-dimensional machine layout problems with both symmetric and asymmetric flows are addressed in this research.

Based on the flow pattern of materials between the machines, a construction heuristic is developed here to solve the machine layout problem. The same heuristic is used to solve the problems with asymmetric and symmetric flows. The …

Initial Study Of Deep Inelastic Scattering With Zeus At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, S. Repond, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Barbagli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, C. Del Papa, F. Frasconi, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi

Faculty Publications

Results are presented on neutral current, deep inelastic scattering measured in collisions of 26.7 GeV electrons and 820 GeV protons. The events typically populate a range in Q2 from 10 to 100 GeV2. The values of x extend down to x ∼ 10-4 which is two orders of magnitude lower than previously measured at such Q2 values in fixed target experiments. The measured cross sections are in accord with the extrapolations of current parametrisations of parton distributions. © 1993.

Lumières, Spring Supplement 1993, Louisiana State University And Agricultural & Mechanical College

Friends of the LSU Libraries

The bi-annual newsletters from the Friends of the Library contain information about upcoming and recent events, descriptions of new collections, a list of members, and occasional obituaries, which inform members of the news and needs of the LSU Libraries.

Louisiana Agriculture Magazine, Spring 1993, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Carbon, Nitrogen, And Phosphorus Leaching Rates From Spartina Alterniflora Salt Marshes, R. Eugene Turner

Faculty Publications

Annual carbon, nitrogen, and phosphorus leachate rates from live Spartina alterniflora Loisel in a Louisiana (USA) salt marsh were estimated to be 200, 14, and 3 g m-2, respectively, and to peak in summer and higher salinit~es. Leachate losses of P, N and C are equivalent to a turnover of live plant tissues of 10, 17 and 49 d, respectively, when submerged, and 148, 250 and 721 d, respectively, when unsubmerged. Plant leachate losses during marsh submergence and non-submergence are nearly equal because release rates are 15x greater during submergence. Nitrogen and carbon concentrations relative to phosphorus are proportionately 4x …

Carbon, Nitrogen, And Phosphorus Leaching Rates From Spartina-Alterniflora Salt Marshes, R E. Turner

Faculty Publications

Annual carbon, nitrogen, and phosphorus leachate rates from live Spartina alterniflora Loisel in a Louisiana (USA) salt marsh were estimated to be 200, 14, and 3 g M-2, respectively, and to peak in summer and higher salinities. Leachate losses of P, N and C are equivalent to a turnover of live plant tissues of 10, 17 and 49 d, respectively, when submerged, and 148, 250 and 721 d, respectively, when unsubmerged. Plant leachate losses during marsh submergence and non-submergence are nearly equal because release rates are 15 x greater during submergence. Nitrogen and carbon concentrations relative to phosphorus are proportionately …

Lsu General Catalog 1993-1994, Louisiana State University And Agricultural And Mechanical College

LSU General Catalog

The LSU General Catalog describes all undergraduate and graduate departments and programs with degree requirements and courses offered for each one. The General Catalog includes information on registration and financial aid as well as academic services offered to all students.

Design Of A Functional Calcium Channel Protein: Inferences About An Ion Channel‐Forming Motif Derived From The Primary Structure Of Voltage‐Gated Calcium Channels, Anne Grove, John M. Tomich, Takeo Iwamoto, Mauricio Montal

Faculty Publications

To identify sequence‐specific motifs associated with the formation of an ionic pore, we systematically evaluated the channel‐forming activity of synthetic peptides with sequence of predicted transmembrane segments of the voltage‐gated calcium channel. The amino acid sequence of voltage‐gated, dihydropyridine (DHP)‐sensitive calcium channels suggests the presence in each of four homologous repeats (I–IV) of six segments (S1–S6) predicted to form membrane‐spanning, α‐helical structures. Only peptides representing amphipathic segments S2 or S3 form channels in lipid bilayers. To generate a functional calcium channel based on a four‐helix bundle motif, four‐helix bundle proteins representing IVS2 (T4CaIVS2) or IVS3 (T4CaIVS3) were synthesized. Both proteins …