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Articles 2551 - 2580 of 7798
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Ribosomal Rna And The Early Evolution Of Flowering Plants., Robert Keith Hamby
Ribosomal Rna And The Early Evolution Of Flowering Plants., Robert Keith Hamby
LSU Historical Dissertations and Theses
Since the end of the last century, the predominant theories of the early radiation of the angiosperms have been that the earliest flowering plants were most similar to the present-day Magnoliidae (sensu Takhtajan, 1969). This position has been adopted by many, though there are some who suggest that the base of angiosperm radiation lies within the monocots (Burger, 1981) or a combination of monocots and dicots (Burger, 1977; Donoghue and Doyle, 1989a, 1989b). Many different ancestors to the angiosperms themselves have been proposed including, at one time or another, most of the extant gymnosperms, extinct gymnosperms and the extinct seed …
Decontamination Of Soil Using Electro-Osmosis., Jihad Tawfiq Hamed
Decontamination Of Soil Using Electro-Osmosis., Jihad Tawfiq Hamed
LSU Historical Dissertations and Theses
Electrokinetic soil processing is an innovative insitu technique to remove contaminants from soils and groundwater. The process is an alternative to conventional processes, with significant economic and technical advantages. A theory is presented for pH gradient development by diffusion and convection in electrokinetic processing of soils. The premises and consequences of the theory are discussed. Based upon this theory, a mathematical model is developed to predict the pH gradient development in electro-osmosis. Electro-osmosis tests are conducted on saturated kaolinite specimens loaded with Pb(II), Cd(II), and Cr(III) to investigate the feasibility, efficiency, and energy requirements of the process in removal of …
Assessment Of Athletic Potential And Augmentation Of Performance In Thoroughbred Racehorses., John Daniel Harkins
Assessment Of Athletic Potential And Augmentation Of Performance In Thoroughbred Racehorses., John Daniel Harkins
LSU Historical Dissertations and Theses
The purposes of this dissertation were to (1) determine running abilities of horses on the racetrack, (2) design treadmill standard exercise tests (SETs) to measure exercise variables that correlate with racetrack performance, and (3) assess the influence of training, competition, and ergogenic aids on performance. Run times of 25 Thoroughbreds were determined during solo and competitive track runs of 1200, 1600, and 2000 meters. Cardiac, respiratory, and hematologic variables were later measured during treadmill SETs. Variables were correlated with average run times. Heart rate scores, V$\sb{200}$, plasma lactate values, and maximal oxygen uptake correlated best with performance. Interval and conventional …
Small Sample Properties Of Estimators And Test Statistics In Nonlinear Regression: The Box-Cox Transformation., Minbo Kim
LSU Historical Dissertations and Theses
The dissertation will address small sample properties of estimators and test statistics in a nonlinear regression model. The Box-Cox transformation is attractive to economists because a family of functional forms can be compared simultaneously within the framework of classical statistical inference. Usually, maximum likelihood (ML) methods are used to estimate the Box-Cox model. In the present study, nonlinear two stage and iterative generalized least squares (IGLS) method are considered. The accuracy of probability statements concerning nonlinear models is often questionable in small samples. Therefore, the finite sample distribution of the asymptotic t-statistic in the Box-Cox model is derived using an …
Juvenile Penaeid Shrimp Ecology In A Louisiana Coastal Marsh Management Area., Everett Eric Knudsen
Juvenile Penaeid Shrimp Ecology In A Louisiana Coastal Marsh Management Area., Everett Eric Knudsen
LSU Historical Dissertations and Theses
Juvenile penaeid shrimp were studied by a variety of methods in a southwest Louisiana, brackish marsh. Most of the work was conducted in two study ponds, one with a fixed-crest weir and the other without. In mark and recapture studies, both brown shrimp Penaeus aztecus and white shrimp P. setiferus were found to grow faster in marsh behind a fixed-crest weir. There was no apparent weir effect on mortality of either species. Brown shrimp emigrated an average of 12 d later from marsh behind the weir; white shrimp were sometimes delayed by the weir. The peak of brown shrimp emigration …
An Adaptive Control System For Biological And Robotic Simulations., Sunggyu Kwon
An Adaptive Control System For Biological And Robotic Simulations., Sunggyu Kwon
LSU Historical Dissertations and Theses
An adaptive control algorithm based on Albus' CMAC (Cerebellar Model Articulation Controller) was studied with emphasis on how to build a Multilayered CMAC Control System. This concept has been devised to circumvent the excessive memory requirements of CMAC controllers for complex control systems with many inputs. The Neighborhood Sequential Training technique was devised as a general CMAC training technique. This training technique is straightforward to implement and well matched to CMAC's memory generalization. A two-layered CMAC control module was simulated for a six dimensional CMAC problem of trajectory control for a six degree of freedom manipulator. Layering was accomplished by …
Development, Fabrication And Verification Of The Lsu In Situ Testing Calibration Chamber (Lsu/Calchas)., Dario Cardoso De Lima
Development, Fabrication And Verification Of The Lsu In Situ Testing Calibration Chamber (Lsu/Calchas)., Dario Cardoso De Lima
LSU Historical Dissertations and Theses
This dissertation introduces the Louisiana State University Calibration Chamber System (LSU/CALCHAS) for calibrating electronic cone penetrometers and other in situ testing equipment. It permits the simulation of the K$\sb{\rm o}$ consolidation and the four (4) traditional boundary conditions commonly referred in the literature. The calibration chamber system encompasses a 304 stainless steel cylindrical calibration chamber which can house a soil sample.55 m (20 21/32 in.) in diameter and.79 m (31 1/16 in.) in height. A fully computerized control panel, a data acquisition and reduction system, a large dimension automatic tamper for preparing compacted soil samples, and accessories comprise the complete …
Low-Temperature Oxidation Of Silicon Using Point-To-Plane Corona Discharge., Mohammad Reza Madani
Low-Temperature Oxidation Of Silicon Using Point-To-Plane Corona Discharge., Mohammad Reza Madani
LSU Historical Dissertations and Theses
A technique for low temperature oxidation of silicon in dry oxygen ambient at temperatures between 25$\sp\circ$C to 500$\sp\circ$C using negative point-to-plane corona discharge is developed. The oxidation rate is a strong function of temperature is found to increase significantly in comparison with the conventional thermal oxidation rate. For the thicker films, the refractive index of the grown oxide layer approaches the value obtained for high temperature thermally grown oxide. The effects of some independent process parameters such as time, temperature, and ion current on the oxidation of silicon are studied. The electrical quality of the grown oxide film is investigated. …
In Situ And Laboratory Evaluation Of Liquefaction Resistance Of A Fine Sand., Behnam Mahmoodzadegan
In Situ And Laboratory Evaluation Of Liquefaction Resistance Of A Fine Sand., Behnam Mahmoodzadegan
LSU Historical Dissertations and Theses
Liquefaction is a phenomenon during which saturated cohesionless soils lose a major portion of their shear strength, and can potentially cause catastrophic failures. This study was focused on the in-situ and laboratory evaluation of liquefaction risk. Several types of penetration tests were performed. Four procedures were selected to evaluate the liquefaction potential of a number of sandy sublayers in two sites with well-documented seismic history. A new hollow cylinder equipment, which allows performing monotonic or cyclic liquefaction tests on annular soil specimens, was designed, fabricated and calibrated. The laboratory testing program included monotonic and cyclic liquefaction tests using two different …
Speciation And Redox Chemistry Of Selenium And Arsenic In Wetland Soils And Sediments., Patrick Henri Masscheleyn
Speciation And Redox Chemistry Of Selenium And Arsenic In Wetland Soils And Sediments., Patrick Henri Masscheleyn
LSU Historical Dissertations and Theses
Studies dealing with the speciation, species transformations, and solubility of selenium and arsenic as affected by soil or sediment redox potential and pH were initiated because of a lack on information and the need for a better understanding of selenium and arsenic chemistry in wetland soils and sediments. Analytical techniques were developed that permitted the determination of selenium and arsenic species commonly encountered in soils and sediments. The speciation and redox chemistry of selenium and arsenic was studied in selected soils and sediments. Under reduced conditions ($-$200 mV), selenium solubility in sediments from Kesterson Reservoir (CA) and Hyco Reservoir (NC) …
The Uneasiest State: Art, Culture, And Society In New Deal Louisiana, 1933-1943. (Volumes I And Ii)., Richard B. Megraw
The Uneasiest State: Art, Culture, And Society In New Deal Louisiana, 1933-1943. (Volumes I And Ii)., Richard B. Megraw
LSU Historical Dissertations and Theses
During the Great Depression artists working in programs funded by the federal government roamed the nation wielding brushes, jotting notes, and pointing cameras in an attempt to define and characterize American society. Never before and not since has this country conducted so intensive a survey of itself, or one so controversial. Federal patronage of the arts occurred during an anxious period of political and cultural turmoil, a turmoil inherent in the story of the Arts Projects themselves. The very structure, organization, composition, execution, and objectives of the arts agencies mirror the tensions of the age. The artists' selection or avoidance …
Designing Efficient Algorithms For Distributed Systems., Mohan B. Sharma
Designing Efficient Algorithms For Distributed Systems., Mohan B. Sharma
LSU Historical Dissertations and Theses
Search for efficient algorithms for distributed systems has become an important area of computer science. This research is driven by the need to efficiently process and communicate information generated by the system. In distributed systems, topological information plays an important role in the design of fast algorithms for problems such as routing, broadcasting, and sorting. The central focus of this dissertation is the design and analysis of distributed algorithms for determining topological information in asynchronous communication networks. Specifically, we present distributed algorithms for two generic problems: distributed graph problems and network traversal problems. Network location and network recognition are two …
Wood Specific Gravity Gradients In Tropical Trees., Michael Carl Wiemann
Wood Specific Gravity Gradients In Tropical Trees., Michael Carl Wiemann
LSU Historical Dissertations and Theses
Pith to bark wood specific gravity (SG) trends were measured in tropical trees and compared with trends found in temperate trees. Extraordinary increases were found across the stems of some tropical wet forest colonizing species, with most tropical species showing at least moderate increases. In contrast, temperate species showed little change, and decreases were almost as common as increases. In Chapter One (published in Wood Fiber Sci. 20(3):344-349), three colonizing species in tropical wet forest were found to produce low SG wood when small and to linearly increase SG with diameter growth. Trends in small trees were similar to those …
Sugarcane Pollen Viability And Seed Setting As Affected By Daylength Decline Rates And Relative Humidity., Adel Mostafa Abou-Salama
Sugarcane Pollen Viability And Seed Setting As Affected By Daylength Decline Rates And Relative Humidity., Adel Mostafa Abou-Salama
LSU Historical Dissertations and Theses
The effects of daylength decline rates and relative humidity levels and durations on pollen viability and seed setting of sugarcane (Saccharum spp.) were investigated. Two studies were carried out at St. Gabriel Research Station of the Louisiana Agricultural Experiment Station. Daylength decline rates of one half and one minute per day were studied on 354 crosses made within three years using 54 males and 92 females. Males treated with one half minute daylength decline rate had higher pollen viability. Seed production was not affected by the treatments. Varietal differences were found responsible for most of the variation obtained. The two …
Molecular Cloning And Characterization Of The Rhodobacter Capsulatushema Gene., Maureen Smith Wright
Molecular Cloning And Characterization Of The Rhodobacter Capsulatushema Gene., Maureen Smith Wright
LSU Historical Dissertations and Theses
The first step in the common tetrapyrrole pathway in Rhodobacter capsulatus is the condensation of glycine with succinyl CoA to form 5-aminolevulinate which is then used in the synthesis of bacteriochlorophyll, heme, vitamin B-12, and siroheme. To isolate mutants unable to form 5-aminolevulinate, as a first step in studying regulation of the tetrapyrrole pathway, R. capsulatus was mated with E. coli carrying plasmid pSUP2021. pSUP2021 carries transposon Tn5 and is incapable of replicating in R. capsulatus making it an ideal vector for transposon mutagenesis. One colony was found which requires 5-aminolevulinate for growth. This mutant strain, designated AJB529, has a …
Characterization Of Solid Matrices For Solidification/Stabilization Of Hazardous Wastes Using Solid State Nuclear Magnetic Resonance Spectroscopy And Other Analytical Techniques., Humayoun Akhter
LSU Historical Dissertations and Theses
Solidification/stabilization (S/S) is a valuable technology for the treatment of certain waste streams, e.g., metal plating wastes, incinerator ashes, etc., and has great potential for use in treatment of contaminated soils. Although this technology is relatively cheap, significant questions remain about the range of its applicability. Cement chemistry is very complex and poorly understood, and the possibility that contaminants could adversely affect the durability and permeability of the matrix is very real. The broad aims of the present studies are to survey S/S binding agents and additives with respect to their abilities to immobilize As, Cr, Pb, and phenols, the …
The Effect Of Structure And Geometry On The Spectroscopy Of Beta-Diketones., Steven Eugene Arnold
The Effect Of Structure And Geometry On The Spectroscopy Of Beta-Diketones., Steven Eugene Arnold
LSU Historical Dissertations and Theses
In this work the ultraviolet (UV) absorption and the $\sp1$H and $\sp{19}$F nuclear magnetic resonance spectra of $\beta$-diketones were studied. Potential energy curves for various geometries of the compounds were calculated by means of the MNDO method. The compounds included in the work were acetylacetone, trifluoro- and hexafluoro-acetylacetone, benzoylacetone, dibenzoylmethane, benzoyltrifluoroacetone, 3-methyl-acetylacetone, 1,3-cyclopentanedione, 1,3-cyclohexanedione, 2-methyl-1,3-cyclohexanedione and 2-acetyl-cyclohexanone. The spectra of the neutral enolic, anionic and cationic species were investigated. In addition, the spectra of the reaction products of the compounds with boron trifluoride which were formed in polar and nonpolar solvents were studied. The results were interpreted in terms of …
Ecology Of Small Insectivorous Birds In A Bottomland Hardwood Forest., Wylie Clark Barrow Jr
Ecology Of Small Insectivorous Birds In A Bottomland Hardwood Forest., Wylie Clark Barrow Jr
LSU Historical Dissertations and Theses
Changes in species composition and abundance, habitat use patterns and foraging behavior of 19 bird species in a bottomland hardwood forest in Louisiana were studied during the 1984-1989 breeding seasons. Species that used only one macrohabitat included the Yellow-throated Warbler along oxbow lake margins and the American Redstart, Swainson's Warbler, and Hooded Warbler in non-flooded oak-gum-elm forest. The Northern Parula and Kentucky Warbler used 2 macrohabitats--non-flooded forest and oxbow lake margins. Thirteen species used 3 macrohabitats (non-flooded forest, seasonally flooded forest, and oxbow lake margins). I distinguished 6 groups of species that used similar microhabitat and foraging behavior. Ecological partitioning …
The Relationship Of Serum Killing, Phagocytosis And Oxidant Production By Bovine Monocyte-Derived Macrophages To Intracellular Survival Of Brucella Abortus., Denise Ida Bounous
The Relationship Of Serum Killing, Phagocytosis And Oxidant Production By Bovine Monocyte-Derived Macrophages To Intracellular Survival Of Brucella Abortus., Denise Ida Bounous
LSU Historical Dissertations and Theses
Functional activities of monocyte-derived macrophages and serum killing ability in a population of Brucella abortus-naive cows were evaluated. The ability of these macrophages to phagocytize and control intracellular survival of B.abortus and to produce oxidant was measured. Fresh normal bovine sera killed significantly more B.abortus than reactor serum or fetal bovine serum. When heated to destroy complement, none of the sera were capable of significant killing. The ability of sera from B.abortus-naive cows to kill the bacteria was normally distributed, with all animals within $\pm$ 2 sd of the mean. Phagocytosis of bacteria opsonized with autologous or reactor sera was …
Probabilistic Analysis Of Bridge Scour Using The Principle Of Maximum Entropy., Donald Edward Barbe'
Probabilistic Analysis Of Bridge Scour Using The Principle Of Maximum Entropy., Donald Edward Barbe'
LSU Historical Dissertations and Theses
The probability distribution function for floods and velocity profile in open channel flow are combined with scour theory to present a procedure for determining the risk of bridge failure due to scour. This is accomplished by deriving a probability distribution function for scour at a bridge pier. The theory of entropy and the principle of maximum entropy are used to determine the velocity profile. The constraints used in the entropy maximization are derived from the physical laws of conservation of mass, momentum, and energy. A procedure to approximate the solution to the resulting equations is shown. The vertical velocity is …
The Results Of The Edict Of Toleration In The Southern Austrian Province Of Carinthia During The Reign Of Joseph Ii., Barry Royce Barlow
The Results Of The Edict Of Toleration In The Southern Austrian Province Of Carinthia During The Reign Of Joseph Ii., Barry Royce Barlow
LSU Historical Dissertations and Theses
Historians have debated whether the radical reforms of the Habsburg Emperor Joseph II (1780-1790) were motivated by the spirit of Enlightenment or simply by Realpolitik. The purpose of this work is to go beyond the legal and philosophical discussion surrounding this debate; to examine the effects of one piece of legislation, the Edict of Toleration, as the government interpreted and applied it in the southern province of Carinthia; and in so doing, to provide a clearer picture of the person of the Emperor and his bureaucracy. While today's conception of toleration includes an equal recognition and respect for all rights, …
Assessing The Potential Impact Of Sugarcane Varieties And Predation On Diatraea Saccharalis (F.) Populations In Southern Louisiana., Ricardo Tomas Bessin
Assessing The Potential Impact Of Sugarcane Varieties And Predation On Diatraea Saccharalis (F.) Populations In Southern Louisiana., Ricardo Tomas Bessin
LSU Historical Dissertations and Theses
To facilitate a better understanding of how varietal resistance and predation affect area-wide sugarcane borer populations, several studies were undertaken before the development of a simulation model. The first study was a 3-year investigation into the compatibility and contributions of varietal resistance, arthropod predation and insecticide toward sugarcane borer control. Insecticides were shown to be the predominant management factor preventing plant injury, but varietal resistance appeared nearly as important in terms of sugarcane borer population regulation in sugarcane. The next study assessed a moth production index in addition to the percentage of bored internodes as a tool for quantifying varietal …
Influence Of Storage Temperature And Duration On Deterioration Of Film-Wrapped And Non-Wrapped Mustard, Brassica Juncea Coss., Regina Poillion Bracy
Influence Of Storage Temperature And Duration On Deterioration Of Film-Wrapped And Non-Wrapped Mustard, Brassica Juncea Coss., Regina Poillion Bracy
LSU Historical Dissertations and Theses
Mustard "greens' is a popular fresh vegetable, especially in the South. Fresh market production, however, is restricted to local sales or short-distance markets due to the relatively short shelf life of mustard. Packaging has been shown to successfully extend the shelf life of several fruits and vegetables. To determine the effect of packaging and storage temperature on the postharvest life and quality of mustard, mustard was stored at 1, 4, and 15C in perforated polyethylene bags, Cryovac D-955 60-gauge or 100-guage heat-shrinkable films or not-wrapped. A preliminary experiment was conducted with spinach to develop experiment methodology and for comparison of …
Formation And Destruction Of Nitric Oxide In Fuel-Rich Combustion: Reburning., Thomas Emmett Burch
Formation And Destruction Of Nitric Oxide In Fuel-Rich Combustion: Reburning., Thomas Emmett Burch
LSU Historical Dissertations and Theses
The effect of fuel type on reburning of a simulated flue gas containing 1000 ppm of NO is studied. Stable nitrogen species concentrations are provided for reburning experiments with five fuels in a premixed, laminar flow reactor. The reactor was operated at atmospheric pressure and gave a maximum gas temperature of approximately 1100$\sp\circ$C for a residence time near 0.2 seconds. The experimental facility used to collect this data is described including a novel coal feeding device. A new gas chromatographic method used to analyze fixed-nitrogen species is described. For each of the five fuels, the fixed-nitrogen speciation as a function …
A History Of Rudimental Drumming In America From The Revolutionary War To The Present., Eric Alan Chandler
A History Of Rudimental Drumming In America From The Revolutionary War To The Present., Eric Alan Chandler
LSU Historical Dissertations and Theses
Rudimental drumming gained significance in America during the period of the Revolution. Ever since the late eighteenth-century and through the nineteenth-century, it was used exclusively in the military. This study traces the migration of drum rudiments and their use in military settings from Great Britain to America. The contributions of the Swiss drummers and the incorporation of their drum music into American rudimental drumming are also examined. The introductory chapter covers related pertinent and prefatory topics such as a definition of rudimental drumming, the duties of the military drummer, non-rudimental types of drumming and a summary of the origin and …
The Relations Between Stress, Mood And Insomnia., Susan Rubman
The Relations Between Stress, Mood And Insomnia., Susan Rubman
LSU Historical Dissertations and Theses
Stress is hypothesized to cause increased cognitive and physiological arousal which is incompatible with sleep. Major life events have been implicated as a significant factor in the onset of chronic insomnia (Healey et al., 1981), and there is some suggestion that minor life events influence symptoms as well (Haynes et al., 1981). The present study was designed to evaluate and further clarify the role of daily minor stressors and mood variables on sleep in both normal sleepers and insomniacs. Subjects with insomnia secondary to medical or physical disorders were excluded from this study. Fifty-four adult subjects (20 mixed-complaint insomniacs, 17 …
Assessment Of Social Competence In Populations Of Learning-Disabled, Behaviorally Disordered And Normal Adolescents., Teresa Jo Scardino
Assessment Of Social Competence In Populations Of Learning-Disabled, Behaviorally Disordered And Normal Adolescents., Teresa Jo Scardino
LSU Historical Dissertations and Theses
The present investigation was designed to examine normal vs. impaired adolescents' social competence according to self, teacher, and parent report. Although the importance of social competence has been established with child and adult populations, few studies have assessed social competence of adolescents. Social competence of learning disabled (LD), behaviorally disordered (BD), and regular education (RE) adolescents was assessed. Nineteen BD, 20 LD, and 66 RE completed self-report measures of social skills and perceived communication/conflict with parents, and sociometric rankings of peers. Teachers of each participating student completed a teacher report measure of the adolescent's social skill, and parents of each …
Effects Of Artificial Mineral Licks On White-Tailed Deer., Stephen Redmore Schultz
Effects Of Artificial Mineral Licks On White-Tailed Deer., Stephen Redmore Schultz
LSU Historical Dissertations and Theses
A commercial mineral mixture for deer was used to evaluate the effects of broad-spectrum dietary mineral supplementation on white-tailed deer (Odocoileus virginianus) growth, antler development, and tissue mineral content. Forty-two artificial mineral licks for deer were established on 3 study areas in East Feliciana Parish, Louisiana. All licks were monitored monthly, recharged to original level if used, and mineral consumption recorded from May 1988 through December 1989. Consumption data were converted to estimated average per deer values based on population estimates. Effects of artificial lick mineral consumption on free-ranging deer were examined by comparing deer harvested during the 1988-89 and …
The Spectroscopy Of Vapor Phase Benzaldehyde And Distant Intercellular Interactions Of Chick Embryo Fibroblast Cell Cultures., Vestel Bryan Shirley
The Spectroscopy Of Vapor Phase Benzaldehyde And Distant Intercellular Interactions Of Chick Embryo Fibroblast Cell Cultures., Vestel Bryan Shirley
LSU Historical Dissertations and Theses
Spectra in different regions of the electromagnetic spectrum were taken at different temperatures for benzaldehyde vapor. A review of the literature revealed that the existing data could not be interpreted by this model. Possible perturbations were reviewed. Potential models based on these perturbations were proposed. Calculations were carried out to test the interpretation. No disagreement between experimental and computational findings resulted. The models proposed contradicted no existing experimental determination of the ground state of vapor phase benzaldehyde. It was determined that electron and neutron diffraction experiments were necessary to determine the ground state structure of benzaldehyde. If the results show …
Soil- And Water-Based Management Strategies For Revegetation And Productivity Improvement Of Brackish Marsh Soil., Gilbert C. Sigua
Soil- And Water-Based Management Strategies For Revegetation And Productivity Improvement Of Brackish Marsh Soil., Gilbert C. Sigua
LSU Historical Dissertations and Theses
Laboratory, greenhouse, and field experiments were conducted on brackish marsh soil of Hackberry, Louisiana (LA). This study was aimed to obtain detailed information on some soil- and water-based management factors that were applicable to the revegetation and productivity improvement of the area. This area was inundated by brackish-saline water, and is now open water, almost totally void of vegetation. The deteriorating productivity and continuous loss of vegetation in the study area can be related to the seasonal and temporal biochemical transformations. These transformations were significantly correlated to precipitation and minimum and maximum temperature in the area. Stochastic regression models were …