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Articles 31 - 49 of 49
Full-Text Articles in Physical Sciences and Mathematics
Complexity And Nekton Use Of Marsh Edge Habitats In Barataria Bay, Louisiana, Timothy W. Birdsong
Complexity And Nekton Use Of Marsh Edge Habitats In Barataria Bay, Louisiana, Timothy W. Birdsong
LSU Master's Theses
This study examined the effects of intrahabitat variability on marsh edge use by fishes and decapod crustaceans. The objectives were to (1) identify quantitative measures of habitat complexity that describe the structural design of marsh edge habitats, and (2) examine differences in nekton use between cut-bank and gently sloping marsh edge habitats. The study was conducted in Barataria Bay, Louisiana at 75, 10-m marsh edge study sites. Monthly seining was conducted in fall 2003 and spring 2004 and measures of habitat complexity were recorded at each sample location. Indices of tidal inundation and site exposure to wind and wave action …
Comparison Of The Efficiency Of Utilization Of Amino Acids From Intact Protein And Amino Acids In Crystalline Form By Channel Catfish, (Ictaluras Punctatus), Amogh Arun Ambardekar
Comparison Of The Efficiency Of Utilization Of Amino Acids From Intact Protein And Amino Acids In Crystalline Form By Channel Catfish, (Ictaluras Punctatus), Amogh Arun Ambardekar
LSU Master's Theses
Two laboratory feeding trials were conducted to quantify differences in the digestibility and absorption of dietary amino acids provided in intact protein or in purified amino acid mixtures. In the first experiment, 36 channel catfish (346 ± 47 g) were force-fed one of six practical feed ingredients (blood meal, corn meal, fish meal, meat and bone meal, soybean meal or wheat middlings), or a mixture of crystalline amino acids designed to duplicate the amino acid composition of each of the practical ingredients. Apparent digestibility coefficients (ADC) were calculated for 15 amino acids in each practical ingredient and in each amino …
Parallel Molecular Dynamics Simulations Of Antimicrobial Peptides, Svetlana V. Oard
Parallel Molecular Dynamics Simulations Of Antimicrobial Peptides, Svetlana V. Oard
LSU Master's Theses
Molecular dynamics (MD) simulations of the wheat antimicrobial peptide â-purothionin were carried out in explicit water (~14,000 atoms) using an all-atom model. The structural properties of the peptide as a function of MD simulation, temperature, and presence of the mono- and divalent metal ions were investigated. The accuracy and scalability tests of the code Peach 3.8 for our system were performed on the Intel Xeon-based Linux cluster SuperHelix at Louisiana State University (LSU). The code showed the reliable accuracy and the parallel efficiency of 0.61 for ~14,000 particles on 16 processors. The microcanonical (MC) MD simulation of â-purothionin in water …
Stormwater Diversion As A Potential Coastal Wetland Restoration Method, Jennifer Howard Woods
Stormwater Diversion As A Potential Coastal Wetland Restoration Method, Jennifer Howard Woods
LSU Master's Theses
The Barataria-Terrebonne estuary has been eroding at a rate of up to 103.6 km2 yr-1 for several decades. If the current rate of loss is not reduced, an additional 2,550 km2 of coastal wetlands will be lost by the year 2050. Currently, stormwater in Terrebonne Parish is pumped into canals, ultimately discharging into the Gulf of Mexico. An opportunity exists to use this stormwater for wetland restoration; however, the ecological impacts of stormwater diversions on wetlands are unknown. The objectives of this project were to 1) to investigate the seed banks of a degraded marsh to determine if a viable …
Properties Of Borate-Treated Strandboard Bonded With Pmdi Resin, Yiqiang Zhou
Properties Of Borate-Treated Strandboard Bonded With Pmdi Resin, Yiqiang Zhou
LSU Master's Theses
Random strandboards from mixed southern wood species were manufactured using calcium borate (CB) and zinc borate (ZB) as chemical additives and polymeric methylene diphenylmethane disocyanate (pMDI) as resin. There were four target levels of borate loading and two levels of resin content. Panel properties, including modulus of elasticity (MOE), modulus of rupture (MOR), internal bond (IB) strength, linear expansion (LE), thickness swelling (TS), leachability, and swelling and strength retention properties under cyclic relative humidity, were measured. The influence of borate content, borate type, and resin content on various properties was analyzed. It was found that the addition of borate negatively …
Evaluation Of A Desktop Computed Radiography System For Imrt Dosimetry, Ines-Ana Jurkovic
Evaluation Of A Desktop Computed Radiography System For Imrt Dosimetry, Ines-Ana Jurkovic
LSU Master's Theses
Different techniques have been developed and used to evaluate dose distribution calculation accuracy and dose delivery reproducibility as a part of patient-specific IMRT QA – e.q. film dosimetry, ionization chambers, and diode arrays. To verify that the calculated dose distribution is delivered accurately during treatment, film dosimetry is usually used. The accuracy and reproducibility of film optical density as an indicator of dose is influenced by several variables, including the chemical processing and scanning conditions. This study investigates the possibility to use a desktop computed radiography (CR) system for patient-specific intensity modulated radiation therapy (IMRT) quality assurance (QA). A study …
Microsatellite Instability In Squamous Cell Carcinoma And Lichen Sclerosus Of The Vulva, Sidney Joseph Marlborough
Microsatellite Instability In Squamous Cell Carcinoma And Lichen Sclerosus Of The Vulva, Sidney Joseph Marlborough
LSU Master's Theses
The usefulness of detecting genomic instability in the form of microsatellite instability (MSI) has been examined in a number of cancers. Squamous cell carcinoma (SCC) and adjacent normal and lichen sclerosis (LS) samples were taken from patients with radical vulvectomies. Vulvar SCC samples were compared with adjacent normal samples using four oligonucleotide markers (BAT-25, BAT-26, D10S208 and D10S587) found to be informative with other carcinomas. Using polymerase chain reaction techniques, 30 vulvar SCC DNA samples were examined for MSI. BAT-26 displayed the highest level of MSI and was considered to be the most sensitive marker in studying vulvar SCC. There …
An Analysis Of Cardiovascular And Respiratory Mortality As A Function Of Ambient Ozone And Fine Particulate Matter In The Baton Rouge Air Quality Control Region, Thomas James Wiley Iv
An Analysis Of Cardiovascular And Respiratory Mortality As A Function Of Ambient Ozone And Fine Particulate Matter In The Baton Rouge Air Quality Control Region, Thomas James Wiley Iv
LSU Master's Theses
The Baton Rouge Air Quality Control Region has come under fire due to difficulties in reaching attainment of one-hour daily ozone limitations and its general perception as being a polluted place to live. Ozone is a reactive oxygen species which has been shown to result in damage to biological molecules and is detrimental to human physiology, especially in regards to cardio-respiratory structure and function. In the last decade, fine particulate matter less than 2.5 microns in mean aerodynamic diameter have been identified as a possible pollutant that is affecting public health at levels lower than the EPA’s established limits. PM2.5 …
Validation Of Pet/Ct Dataset For Radiation Treatment Planning, Rajesh Manoharan
Validation Of Pet/Ct Dataset For Radiation Treatment Planning, Rajesh Manoharan
LSU Master's Theses
PET/CT scans are frequently used for radiation treatment planning (RTP). Our work demonstrates a practical approach for validating the PET/CT dataset for RTP. We tested this QA process on a Reveal HD PET/CT scanner. The phantom used is a TGM2 ISIS QA phantom, a 14 cm acrylic cube with a central bore for object inserts. It has four different built-in inserts for electron density verification. 22Na seeds are inserted into the pinholes at the side of the cube. PET/CT images of the phantom with 22Na seeds are acquired and fused in the scanner Syngo fusion software. Registration of the PET/CT …
Quality Assurance Testing Of The Eclox-M In Detecting Terrorism Threats In Louisiana's Public Drinking Water Systems, Jessica Coleman
Quality Assurance Testing Of The Eclox-M In Detecting Terrorism Threats In Louisiana's Public Drinking Water Systems, Jessica Coleman
LSU Master's Theses
A quality assurance testing of the ECLOX-M™, a rapid water quality indicator used in potential terrorist attacks, was evaluated for its adequacy in nine regional Louisiana water systems. The ECLOX-M™ system uses enhanced chemiluminescence to measure toxicity in water by integration of a mixture of luminol (C8H7O3N3), and an oxidant in the presence of a catalyst enzyme - horseradish peroxidase (HRP). Water samples were tested for chemiluminescence, chlorine content, pH, and arsenic and/or nerve agent/pesticide contamination. In addition, three toxic industrial chemical standards were evaluated (mercury, a volatile liquid mixture, and a …
Software Architecture: Styles And Representational Schemes, Somo Subro Banerjee
Software Architecture: Styles And Representational Schemes, Somo Subro Banerjee
LSU Master's Theses
Software architecture is being widely used today to describe a very high-level design methodology of large software systems. Software architecture represents the overall structure of a system in an abstract, structured manner. A good architectural representation scheme holds the key to the effectiveness of a software architecture description and usage. In this work we look at architectural styles and architectural representation schemes. We propound the idea that the layered architectural model is a suitable candidate for a generalized architectural style and that it can cater to many different problem domains, other than the message-passing systems it has traditionally been used …
Enhanced Flushing With Cyclodextrin For The Remediation Of Creosote Contaminated Soil, Monalisa Dutta
Enhanced Flushing With Cyclodextrin For The Remediation Of Creosote Contaminated Soil, Monalisa Dutta
LSU Master's Theses
Past practices of applying creosote and coal tar preservatives to wood, such as unlined pits and trenches, have resulted in contamination of the surface and ground water at thousand of sites. The low aqueous solubility, volatility and bioavailability of many these constituents limit their degradation by natural attenuation and standard remediation techniques such as ground water flushing, soil vapor extraction, and bioremediation. While research has shown that cyclodextrin solutions have the ability to enhance the solubility of some of the components of creosote, additional work is needed to evaluate its potential as a remedial agent for these sites. Equilibrium batch …
Seismic Stratigraphic Investigation Of The Ukpokiti Field Channel Complex, Oml 108, Offshore Nigeria, Northwestern Niger Delta, Toby Latwan Stewart
Seismic Stratigraphic Investigation Of The Ukpokiti Field Channel Complex, Oml 108, Offshore Nigeria, Northwestern Niger Delta, Toby Latwan Stewart
LSU Master's Theses
Detailed seismic stratigraphic analyses and mapping show that a well defined Ukpokiti Field Channel complex (late Miocene) found on the up-thrown side of a major back-to-back fault system in the West Niger delta inner-continental shelf probably formed during a single eustatic fall. The channel (>500 msec, 10 km wide) shows several tributaries entering the trunk axis from what was probably a surface of subaerial exposure. Slumping is prominent on the north flank of the trunk channel. No channel unconformity is evident in the down-thrown block. This investigation seeks to resolve the lack of down-dip correlative seismic expression across the …
A Comparison Of A High-Resolution Survey And A Three-Dimensional Seismic Survey In A Feature-Rich Region Of The Green Canyon Area, Gulf Of Mexico, Bruce Miles Samuel
A Comparison Of A High-Resolution Survey And A Three-Dimensional Seismic Survey In A Feature-Rich Region Of The Green Canyon Area, Gulf Of Mexico, Bruce Miles Samuel
LSU Master's Theses
Recent advances in Autonomous Underwater Vehicle (AUV) technology have revolutionized the positioning and accuracy of high-resolution deep sea mapping tools. Geologic hazard and engineering surveys by AUV’s are producing high-resolution data sets of a quality that has never before been seen. Three-dimensional (3D) seismic data, though traditionally used for only deep subsurface mapping of large areas, is now being reprocessed at a higher resolution and utilized in well site investigations and geologic hazard assessments. This study makes a comparison between a 3D seismic survey and an AUV high-resolution survey in order to determine the strengths and weaknesses of both of …
An Examination Of The Relationship Between Environmental Science And Law Due To Emerging Micro-Scale Gas Chromatography Technology, Alfred Ruks Politzer
An Examination Of The Relationship Between Environmental Science And Law Due To Emerging Micro-Scale Gas Chromatography Technology, Alfred Ruks Politzer
LSU Master's Theses
The intersection of science and law is very complex. The two disciplines frequently interact due to environmental issues. Expert testimony is most often the method used to introduce scientific data into the legal system. Advances in technology have allowed scientists to increase the preciseness and reliability of data produced. The development of the gas chromatograph and the recent microFAST gas chromatograph has greatly increased the amounts of data available to the legal system. The legal system has relatively recently developed a set of guidelines with which to evaluate scientific evidence and determine whether it should be admitted into trial. Previously …
Migmatization Of Archean Aluminous Metasediments From The Eastern Beartooth Mountains, Montana, U.S.A., Andrew T. Maas
Migmatization Of Archean Aluminous Metasediments From The Eastern Beartooth Mountains, Montana, U.S.A., Andrew T. Maas
LSU Master's Theses
Geothermobarometry, mineral compositions and textures, and thermodynamic models suggest biotite dehydration melting occurred in the peraluminous rocks of the eastern Beartooth Mountains. These Archean metapelitic migmatites are metatexites and diatexites, and have typical metamorphic assemblages of Qtz + Pl + Kfs + Bt + Sil +/- Grt +/- Crd. The subsequent in situ crystallization of the magma derived from the biotite dehydration created migmatitic leucosomes in the rocks. These leucosomes are primarily composed of quartz, plagioclase and potassium feldspar. Water derived from the dehydration of biotite was dissolved in the melted phase. Crystallization of the magma reintroduced this water to …
Effects Of Redox Potential And Ph On The Fate Of Nitroglycerin In A Surface And Aquifer Soil, Sally Yost
Effects Of Redox Potential And Ph On The Fate Of Nitroglycerin In A Surface And Aquifer Soil, Sally Yost
LSU Master's Theses
Nitroglycerin, used in propellant formulations and ignition cartridges in military weapons, has been found as a surface soil contaminant on military installations. Concerns have arisen since the fate and mobility of nitroglycerin is not understood in these natural environments. The objective of this study was to determine the fate of nitroglycerin in natural field soils. Nitroglycerin degradation was examined using a surface soil and an aquifer soil under aerobic and anaerobic conditions at three pH levels. Studies were also performed to determine the influence of a supplemental carbon source on degradation. Radiolabeled 14C-nitroglycerin was used to trace the partitioning between …
Individual And Landscape-Level Effects Of Selective Herbicides, Mowing, And Prescribed Fire On Habitat Quality For Northern Bobwhite (Colinus Virginianus), Charles Lynn Kitts
Individual And Landscape-Level Effects Of Selective Herbicides, Mowing, And Prescribed Fire On Habitat Quality For Northern Bobwhite (Colinus Virginianus), Charles Lynn Kitts
LSU Master's Theses
Northern bobwhite (Colinus virginianus) populations have been declining throughout their range during the past 30 years primarily because of a result of loss of early successional habitat. Specifically, intensive silviculture practices and reduction in the use of prescribed fire has led to this loss. I studied effects of management practices (selective herbicides, mowing, and prescribed fire) on male and covey distribution, and brood-rearing habitats on Jackson-Bienville Wildlife Management Area (JBWMA). Specifically, I used calling surveys to assess landscape characteristics associated bobwhite distribution. I also measured vegetation and arthropod response, using imprinted bobwhite chicks, pitfalls, and sweep nets, to different habitat …
Lattice Boltzmann Simulation Of Flow Around Bluff-Bodies, Kevin Tubbs
Lattice Boltzmann Simulation Of Flow Around Bluff-Bodies, Kevin Tubbs
LSU Master's Theses
In this work, results from a 2-D Lattice Boltzmann (LB) solver are presented simulating flow past rectangular square cylinders at low Reynolds numbers (< 250). The LBGK equation is a hyperbolic equation that approximates the Navier Stokes equations in the nearly incompressible limit. It is a system of 9 one dimensional partial differential Hamiltonian-Jacobian equations, consisting of an advection and diffusive portion. The LB method is an alternative computational fluid dynamics (CFD) method used to numerically predict incompressible viscous flow. The current LB method uses a statistical mechanics formulation to solve the Boltzmann equation. The LB model captures the nonlinear Navier Stokes advection terms using linear streaming operators. In this thesis, the LB model is classified as an explicit, Lagrangian, finite-hyperbolicity and weakly compressible approximation of the Navier Stokes equations. The momentum flux tensor is captured locally as opposed to a pressure field eliminating the need to solve the Poisson equation. This allows the fluid structure interactions (FSI) behavior to be calculated elegantly at the interface through the mesoscopic momentum transfer between the fluid and structure. At this level, the forces are simultaneously calculated. The LB equations are discretized both in time and phase space using a standard D2Q9 lattice model. Validation tests for flow around single square cylinders at different aspect ratio at low Reynolds numbers are presented. Good agreement with other investigators is achieved. Flow past multiple bluff bodies (representing building in a city) is also presented. The vortex shedding simulations presented provide preliminary indications in terms of St that the LB method can be used to simulate high Re flow.