Digital Commons Network^™

Star Formation, Using Three-Dimensional Explicit Eulerian Hydrodynamics., Harold Alden Williams

LSU Historical Dissertations and Theses

Evolutions of rapidly rotating, self-gravitating objects initially in axisymmetric equilibrium have been studied using a 3-D Newtonian hydrodynamic computer code with an eye toward understanding angular momentum transport in dynamically evolving protostars. First, a number of evolutions have been modeled using an existing explicit, Eulerian, finite difference code that is accurate to first-order in its spatial differences. The bar-mode dynamic instability has been explored by considering several models with different degrees of compressibility. This instability occurs in models having $\beta > \beta\sb{d} \equiv$ 0.27, where $\beta$ is the ratio of the rotational to the gravitational potential energy. A two-armed spiral, with …

The Army Air Corps Under Franklin D. Roosevelt: The Influence Of Air Power On The Roosevelt Administration, 1933-1941., Jeffery Scott Underwood

LSU Historical Dissertations and Theses

When Franklin D. Roosevelt entered the White House in 1933, the leaders of the Army Air Corps wanted to create an independent air force. Using Billy Mitchell's tactics of public confrontation, exploitation of the Air Corps' poor condition and unproven claims about air power, these officers only antagonized the people who could grant them independence. After 1934, Oscar Westover, H. H. "Hap" Arnold, Frank Andrews, and a number of other Air Corps officers started a concerted effort to promote themselves as "team players" who had given up Mitchell's methods. With demonstrations, like long range flights to South America, they proved …

Entity Relationship Approach To Knowledge Base Systems., Sreerama Krishna Karukonda

LSU Historical Dissertations and Theses

A unified framework for knowledge base systems is proposed based on Entity-Relationship (ER) approach. Following the analysis and the specification of the real-world using Entity-Relationship approach, the knowledge base is implemented as a first-order logic system, a production system, or a frame-based system by mapping the appropriate symbolic data structures. An approach for analyzing and specifying real-world perceptions must provide appropriate semantic primitives. Therefore, a justification is provided for the semantic primitives proposed in Entity-Relationship approach by considering the fundamental issues in perception. A notation that allows Entity-Relationship approach to be used as a holistic representation is presented. Translation rules …

Enhanced Multidimensional Luminescence Measurements Through Cyclodextrin Complexation, I. M. Warner, G. Nelson, G. Patonay, L. Blyshak, S. L. Neal

Faculty Publications

The authors discuss the use of CDxs (Cyclodextrins) to enhance selective detection via EEM (Excitation Emission Matrix) measurements. Particular emphasis will be placed on the enhanced measurement of luminophors complexed with CDxs in the presence of select alcohols and quenchers. In addition, the use of solvent extraction and data analysis to reduce the dimensionality of the acquired EEM will be discussed. The use CDxs and quenchers can produce a single- or dual-component system from a more complex mixture, which can then be used as model component spectra. This type of data analysis scheme is presented and discussed. In this study, …

Lsu General Catalog 1988-1989, 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.

Modelling Of Passive Contaminant Transport In River Sediments., Susan Anne Savant-Malhiet

LSU Historical Dissertations and Theses

Contaminant transport from riverine sediments was investigated via physical and mathematical models. Due to its remote nature, there exists a lack of understanding of transport mechanisms and rates at the sediment-water interface of rivers. This dissertation is focused on evaluation of potential abiotic transport processes which affect the movement of contaminants across this sediment-water interface. Only non-dispersive transport of passive contaminants was considered allowing the research to focus on the movement of the sediment pore water which carries the contaminants. The abiotic processes studied include the advection by flow of sediment pore water and the movement and turnover of sediment …

Application Of The Correlation Method To The Tuning Of Industrial Control Schemes., Carl Jesse Thomas

LSU Historical Dissertations and Theses

The correlation method of finding a system's impulse response weights, based on the Wiener-Hopf integral, was studied for its application to the tuning of feedback, feedforward, and decoupling control elements in closed loop operation using only ordinary operating data. Also included in the work is a thorough study of actual data for eight typical stochastic disturbances taken from a refinery light ends unit. A disturbance signal typical of these actual signals was used throughout the tuning studies to make results obtained more practically meaningful. These actual signals were also used to demonstrate the desirability of differencing input and output data …

The Relation Between Major Life Events, Minor Events And Psychological Distress., James Cook Gilchrist

LSU Historical Dissertations and Theses

The relation between life events and psychological distress has been a subject of considerable interest in recent years. Most previous research has focused on major life events. The present study investigated the role of minor daily events and their relation to symptoms of depression, anxiety and global psychological distress. Two scoring approaches were used for both types of events; frequency of occurrence and the subjective weighting of each occurrence. A total of one hundred and ninety one subjects volunteered from the community. Each subject completed the daily stress scale each day for seven consecutive days. At the end of the …

Multivariable Adaptive Control Design Under Internal Model Control Structure., Ivan Patricio Solar

LSU Historical Dissertations and Theses

A new adaptive multivariate control scheme has been devised. The method combines the best characteristics of conventional adaptive systems and internal model control (IMC) structure. The control scheme builds by itself the required models and avoids the ambiguities in the definition of performance specifications. The problem of plant inversion associated with the IMC structure has been solved. The method introduced in this work is based on the properties of the Smith-McMillan form. However, the method does not require the explicit determination of the form. Furthermore, the computation of a stable plant inverse requires only matrix inversion and scalar polynomial factorization. …

A Field Method For Assessing Borehole Friction For Directional Well Casing, Eric E. Maidla, Andrew K. Wojtanowicz

Faculty Publications

A field procedure to evaluate the borehole friction factor between a pipe string and a borehole was developed. The primary concern of this research was to investigate and mathematically describe the drag associated with casing runs in directional wells through the use of the two-dimensional approach. The borehole friction factor was found, through an iterative procedure, by matching the calculated hook load to the measured one at the surface. The borehole friction factor was calculated as the unique value for the match. This study shows the necessary precision requirements for the hook load measurement instrumentation and presents three different types …

A History And Daybook Of The English Language Theatre In New Orleans During The Civil War. (Volumes I And Ii)., Paula June Thompson

LSU Historical Dissertations and Theses

This study investigates the theatrical activity in New Orleans between 1860 and 1865 and provides a daybook including all recorded performances in the city during this period. Many active theatres existed in New Orleans prior to 1860. Three theatres, the St. Charles, the Varieties, and the Academy of Music dominated professional English-language dramatic offerings. They brought in the most renowned performers of the period and presented lavish dramatic productions, minstrel shows, circuses and concerts. This study explores the impact of the war on the theatrical activity of these three theatres and attempts to chronicle the adjustments necessary to continue operation. …

Analytical-Toxicological Studies Of Environmental Importance., Hessam Ghane

LSU Historical Dissertations and Theses

Part One. Acidity and chemical composition of precipitation in Baton Rouge, Louisiana; The synergistic effects of acidity and aluminum on fish. Acid precipitation which consists of both wet precipitation and dry deposition has recently become a significant environmental problem. It has been shown that the effects of acid rain are deleterious to soil, vegetation, aquatic life and buildings. Wet-precipitation-only samplers were used to collect acid rainfalls in the vicinity of Louisiana State University, Baton Rouge and subjected to appropriate chemical analysis for the purpose of characterization of general composition and acidity. About 50% of precipitation is within pH range of …

Faculty Senate Resolution 87-05, Louisiana State University And Agricultural & Mechanical College

LSU Faculty Senate Publications

Faculty Senate Resolution regarding the permanent committee on academic computing, adopted on December 8, 1987.

Backfilling Canals To Mitigate Wetland Dredging In Louisiana Coastal Marshes, Christopher Neill, R. Eugene Turner

Faculty Publications

Returning canal spoil banks into canals, or backfilling, is used in Louisiana marshes to mitigate damage caused by dredging for oil and gas extraction. We evaluated 33 canals backfilled through July 1984 to assess the success of habitat restoration. We determined restoration success by examining canal depth, vegetation recolonization, and regraded spoil bank soils after backfilling. Restoration success depended on: marsh type, canal location, canal age, marsh soil characteristics, the presence or absence of a plug at the canal mouth, whether mitigation was on- or off-site, and dredge operator performance.

Backfilling reduced median canal depth from 2.4 to 1.1 m, …

Louisiana Agriculture Magazine, Fall 1987, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Spoil Banks: Effects On A Coastal Marsh Water-Level Regime, Erick M. Swenson, R. Eugene Turner

Faculty Publications

Above- and below-ground water-level fluctuations were measured in the marshes south of New Orleans, Louisiana, between November 1982 and December 1983. The purpose of the program was to defme the basic marsh water-level regime and to investigate how canal spoil banks may influence the water-level regime. Two study areas were used: (1) a control area, defined as a section of marsh with unrestricted hydrologic connection to an adjacent bayou; and, (2) a partially-impounded area, defined as an area with limited hydrologic connection to an adjacent bayou due to the presence of dredged canal spoil banks. Data sources included marsh water …

Lsu General Catalog 1987-1988, 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.

Conditioning Of Ryegrass For Faster Drying, M Tsang Mui Chung

LSU Agricultural Experiment Station Reports

No abstract provided.

Effects Of High-Moisture Ryegrass Hay Ammoniation On Quality Preservation, Billy D. Nelson

LSU Agricultural Experiment Station Reports

No abstract provided.

Climate At The Calhoun Research Station, 1892-1980, Robert A. Muller

LSU Agricultural Experiment Station Reports

No abstract provided.

Use Of Multiple Time Series Analysis To Forecast Maintenance Manhour Requirement For The Chemical Process Industry., Helen Bostock

LSU Historical Dissertations and Theses

It is hypothesized that chemical processing plant maintenance manhour requirement (the number of hours required to maintain a production facility at an optimal level) can be forecast. The hypothesis is supported by (1) a study of the independent variables which may impact the dependent variable, maintenance manhour requirement and (2) a comparative analysis of technological forecasting methods that suggested which methods might be most appropriate. Both econometric and statistical forecasting methods were considered. The philosophy inherent in each approach was recognized. A procedure for choosing a forecasting method to suit a given situation is outlined. Multiple time series analysis, supported …

Fail-Safe Local Area Networking Using Channel Redundancy., Ibibia Karisemie Dabipi

LSU Historical Dissertations and Theses

Local area networks represent a major development in data communications. The ring topology is the most popular of the local area networks. Its inherent problem, however, is the breakdown of the entire network in the event of a station failure resulting in total shut-down until repairs can be made. This dissertation is a study of designs for fail-safe local area networks. Two methods for maintaining the operation of a ring network are analyzed and compared. The first method uses a double-ring where the inner loop is optically coupled to the outer ring whenever a node failure occurs. The analysis performed …

The Rational Overhauser: An Interpolating Rational Cubic Curve., Jeffrey Neil Jortner

LSU Historical Dissertations and Theses

A rational interpolating cubic curve which implicitly maintains first order geometric continuity in splines has been developed. The curve is formed by blending two rational quadratic curves. Since the blending method used was originally introduced by Overhauser, this curve is referred to as the Rational Overhauser (Rover) curve. The curve formulation utilizes four shape factors to provide control of the curve. A geometrical and analytical interpretation of these shape factors and their relationship to each other is discussed. Procedures for representing conic sections using the rational Overhauser curve are presented. Also included are techniques for mapping between the Rover curve …

In Vitro Regeneration And Protein Changes Associated With Two Cultivars Of Agrostis Palustris Huds. Cultured Under High Sodium-Chloride Conditions., John Casper Hovanesian

LSU Historical Dissertations and Theses

Calli from 'Penneagle' and 'Seaside' creeping bentgrass (Agrostis palustris Huds.) were selected for enhanced ability to proliferate on media supplemented with 514 mM NaCl. Based on dry matter production and vigor, growth of plants regenerated from NaCl-adapted calli of both cultivars in saline hydroponic nutrient medium, was superior to that of plants regenerated from non-adapted calli. At 257 mM NaCl, plants from NaCl-sensitive calli died or were unable to produce measurable dry matter whereas plants from NcCl-adapted calli grew well. Growth of plants from NaCl-adapted calli was inhibited at 340 mM NaCl. At 514 mM NaCl, resistant plants no longer …

Parameters Of Peat Formation In The Mississippi Delta (Holocene)., Elisabeth Catharina Kosters

LSU Historical Dissertations and Theses

The Mississippi Delta consists of six major Holocene deltaic complexes, that each had a life-span of about 1500 years. Emphasis of this study is on autochthonous peats of Barataria Basin, a large-scale interdistributary basin, between levees of the LaFourche and St. Bernard/Plaquemine deltas. A 6 m. thick set of lithostratigraphic units constitutes the aggradational basin-fill. Organic-rich beds occur in three phases, each representing an accumulating period that was interrupted by subsidence and the influx of detrital clastics from renewed nearby fluvio-deltaic sedimentation. Peats accumulated in eutrophic, non-domed environments in fresh water swamps and (often floating) marshes and average 81.7% organic …

A Critical Examination Of The Mythological And Symbolic Elements Of Two Modern Science Fiction Series: "Star Trek" And "Doctor Who"., Gwendolyn Marie Olivier

LSU Historical Dissertations and Theses

Carl Gustav Jung and Joseph Campbell both believe that a living mythology is a necessary factor in a viable civilization. According to these two scholars it is the self-actualized individual who is the key element in a healthy society. The purpose of a mythology for Jung and Campbell is to provide the individual with a set of symbols that will assist him in the process of self-realization. Jung believed that the major source of mythology in today's world is dreams, but he acknowledged the fact that anything which provided the unconscious mind with the appropriate symbols could function on a …

An Evaluation Of The Applicability Of Nonlinear Programming Algorithms To A Typical Commercial Process Flowsheeting Simulator. (Volumes I And Ii)., Michael Joseph Richard

LSU Historical Dissertations and Theses

An efficient methodology for using commercial flowsheeting programs with advanced mathematical programming algorithms has been developed for the optimization of operating plants. The methodology was demonstrated and validated using ChemShare Corporation's DESIGN/2000 simulation of the Freeport Chemical Company's plant for sulfuric acid manufacture and three nonlinear programming techniques; successive linear programming, successive quadratic programming and the generalized reduced gradient method. The application of this methodology begins with the development of a feasible base case simulation. Partial derivatives of the economic model and constraint equations are computed using fully converged simulations. This information is used to formulate an optimization problem which …

Design And Evaluation Of Gas-Condensate Wells Using The Systems Analysis Approach., David Stephen Sutton

LSU Historical Dissertations and Theses

The use of Systems Analysis for designing and evaluating wells flowing hydrocarbon mixtures seems to create no computational problems when considering the inflow components, i.e. reservoir and perforations. However, when a gas-condensate system is considered, the outflow component calculating the total pressure losses in the tubing creates a computational problem. This computational problem involves the estimation of the phase properties of the gas-condensate fluid. Thus, the fluid system undergoes phase changes as it moves up the tubing. Attempts by other authors have been made to overcome this by either using a single-phase or two-phase flow model. The single-phase flow model …

Classical And Statistical Thermodynamics Of Gas Solubility In Polar Fluids., Christopher Paul Williams

LSU Historical Dissertations and Theses

The solubilities of argon and of three binary gas mixtures of nitrogen and methane, 25%CH$\sb 4$ - 75%N$\sb 2$, 50%CH$\sb 4$ - 50%N$\sb 2$ and 75%CH$\sb 4$ - 25%N$\sb 2$, in water have been measured at a temperature of 323K for pressures up to 124.1 MPa. The data have been correlated using the established forms of the Krichevsky-Kasarnovsky and Krichevsky-Ilinskaya equations and are in agreement with previous studies. The performance of the Krichevsky-Ilinskaya equation has been improved by using Wilson's equation in place of the two-suffix Margules equation to predict the non-ideality associated with the solute gas in the solution. …

An Experimental Investigation Into Carbon-Dioxide-Induced Organic Deposition., Josh Chia-Hsine Fu

LSU Historical Dissertations and Theses

Wettability change (or a relative permeability effect) has long been considered a mechanism for enhanced oil recovery. Reports show that adsorption of petroleum heavy ends, mainly asphaltenes and resins, onto a rock surface can alter its wettability. Reports also show that high concentrations of CO$\sb2$ will induce the formation of a solid phase in CO$\sb2$/crude mixtures. However, the propensity of a reservoir system for CO$\sb2$-induced hydrocarbon precipitation and how this deposition affects the rock wettability has not been yet investigated. Once variables such as oil composition, pressure, temperature, brine chemistry, and surface mineralogy are adequately defined it becomes possible to …