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Articles 1 - 30 of 44
Full-Text Articles in Physical Sciences and Mathematics
Pet/Ct Detectability And Classification Of Simulated Pulmonary Nodules Using An Suv Correction Scheme, Andrew Nicholas Morrow
Pet/Ct Detectability And Classification Of Simulated Pulmonary Nodules Using An Suv Correction Scheme, Andrew Nicholas Morrow
LSU Master's Theses
Positron emission tomography (PET) and computed tomography (CT) together are a powerful diagnostic tool, but imperfect image quality contributes to false positive and false negative diagnoses by an observer despite experience and training. This work investigated a PET standard uptake value (SUV) correction scheme, based on partial volume effect (PVE), on the classification of lesions as benign or malignant in PET/CT images. The correction scheme comprised several steps. The observer drew a region of interest (ROI) around the lesion using the CT dataset. The ROI was blurred with the assumed point spread function (PSF) of the PET scanner then re-sampled …
Design Of A Fully Autonomous Mobile Pipeline Exploration Robot (Famper), Jong-Hoon Kim
Design Of A Fully Autonomous Mobile Pipeline Exploration Robot (Famper), Jong-Hoon Kim
LSU Master's Theses
Pipelines have been an integral part of our constructions for many centuries. However, need to be maintained, and the cost of maintenance continues to increase. Robots have been considered as an attractive alternative, and many different types of pipeline robots have been proposed in the past. Unfortunately many of them work under only very restricted environments such as customized pipelines, often have no vertical mobility, or can traverse through only a simple pipeline structure due to wired control. This thesis presents the design and implementation of a robot based on novel idea we call “caterpillar navigational mechanism”. A Fully Autonomous …
Influence Of Row Spacing And Debris Distribution On Vegetation And Small Mammals In Louisiana Pine Plantations, Anne M. Bechard
Influence Of Row Spacing And Debris Distribution On Vegetation And Small Mammals In Louisiana Pine Plantations, Anne M. Bechard
LSU Master's Theses
Site preparation after clearcuts directly affects surrounding small mammal populations. Differences in bed row spacing and arrangement of debris can impact structure and composition of vegetation communities, which influence small mammal habitat. We surveyed vegetation and small mammals in 2 different row spacings (14 ft and 20 ft) and 2 different debris distributions (piled and scattered) in 4 clearcuts owned by Weyerhaeuser in Louisiana during 2006-2007. Our objectives were to examine effects of row spacing and debris distribution on vegetation, to look at responses of small mammal densities to row spacing and debris distribution, and to see how small mammals …
Characterization Of The Lucinid Bivalve-Bacteria Symbiotic System: The Significance Of The Geochemical Habitat On Bacterial Symbiont Diversity And Phylogeny, Angela Marissa Green-Garcia
Characterization Of The Lucinid Bivalve-Bacteria Symbiotic System: The Significance Of The Geochemical Habitat On Bacterial Symbiont Diversity And Phylogeny, Angela Marissa Green-Garcia
LSU Master's Theses
Extensive characterization of a single lucinid bivalve habitat was conducted to characterize the relationship between host bivalve and thiotrophic bacterial endosymbionts. For lucinids, the ecological and evolutionary relationships between hosts and endosymbionts are poorly understood. Reconstructing the evolutionary history of lucinid endosymbiosis, and the geologic significance of the association, has been hampered by insufficient knowledge of endosymbiont ecology and taxonomic diversity. Host organisms (Lucinisca nassula and Phacoides pectinatus) were collected from Cedar Keys, Florida, within the top 15-20 cm of the sediment in sea grass beds. PCR amplification and sequencing of bacterial 16S rRNA genes from lucinid gills and sediment …
Strategic Analysis Of Ghana's Wood Export Sector, Odoom Domson
Strategic Analysis Of Ghana's Wood Export Sector, Odoom Domson
LSU Master's Theses
Export-led strategies are very crucial to achieving growth and goals of developing and transition economies such as Ghana. As a result, export strategies are being adopted in many developing countries. Although such export strategies might be in place, the deployment of resources and tax payers’ money involved often calls for the investigation of programs and initiatives that exist and perceptions by industry if they are working. Furthermore, Ghana wood exports to the US, a historically major market, have been declining over the past six years. Therefore, there is the need to determine if export constraints to the US market exist. …
Deciphering Controls On Polyphase Intraplate Deformation In The Ertomiao Region, Lang Shan, North-Central China, Michael Blevins
Deciphering Controls On Polyphase Intraplate Deformation In The Ertomiao Region, Lang Shan, North-Central China, Michael Blevins
LSU Master's Theses
The Ertomiao region of the Lang Shan, China, is located approximately 700 km west of Beijing, in the north-central portion of the North China block. This area is characterized by multiple periods of deformation, including periods of extension and contraction, spanning from Permian through Cenozoic time. This setting provides the structural relationships necessary to decipher the controls of polyphase crustal deformation. During fieldwork key structural observations and crosscutting relationships were established. Beginning with a period of contraction, northeast striking post Jurassic, pre Early Cretaceous (123 ma) thrust faults place Precambrian gneiss (unit PCB) onto Jurassic/Cretaceous sandstone and conglomerate (unit Jr/K). …
Measurement Of Nutrient Availability In Feedstuffs For Florida Pompano And Development Of Formulated Diets For Pompano Aquaculture, Craig Gothreaux
Measurement Of Nutrient Availability In Feedstuffs For Florida Pompano And Development Of Formulated Diets For Pompano Aquaculture, Craig Gothreaux
LSU Master's Theses
Consistently high market demand combined with low commercial catches have made Florida pompano, Trachinotus carolinus, one of the highest valued finfish from the Gulf of Mexico. Economic incentive has spurred interest in pompano culture since the 1950s, yet the body of nutritional research on pompano is still sparse. This study was conducted to measure the apparent digestibility of nutrients among a selection of common feed ingredients, and determine the optimum dietary protein level for juvenile Florida pompano at a fixed protein-to-energy ratio, in order to formulate nutritionally complete, cost-effective diets. The four ingredients tested in the digestibility trial were soybean …
Coarse Woody Debris Characteristics Of Managed And Unmanaged Bottomland Hardwood Forests, John Wesley Cochran
Coarse Woody Debris Characteristics Of Managed And Unmanaged Bottomland Hardwood Forests, John Wesley Cochran
LSU Master's Theses
Increasingly, attention is being paid to the role coarse woody debris (CWD) plays in forest ecosystems. CWD has been shown to provide valuable wildlife habitat, support food webs and contribute to nutrient storage and cycling, and mediate hydrological and geomorphic process. Timber management may be altering CWD dynamics by replacing aging stands with younger, more vigorous ones. The specific objectives of this study were 1) to quantify differences in coarse woody debris characteristics among bottomland hardwood forest stands with different management histories, and 2) to determine how differences in tree species composition and forest structure in bottomland hardwood forests influence …
Synthesis Of Disubstituted Amino Acids And Peptide Inhibitors Of Amyloid Beta Aggregation, Gregory Todd Mccandless
Synthesis Of Disubstituted Amino Acids And Peptide Inhibitors Of Amyloid Beta Aggregation, Gregory Todd Mccandless
LSU Master's Theses
The aggregation process of amyloid beta from monomeric peptide to oligomers and fibrils is believed to be connected with the neurological disorder Alzheimer’s disease. The focus of this research is the synthesis of alpha, alpha-disubstituted amino acids and peptide inhibitors of amyloid beta aggregation. The inhibitors are designed to interrupt (or alter) this process by binding to amyloid beta’s central hydrophobic core region (residues 17-20, Leucine-Valine- Phenylalanine-Phenylalanine). Target specificity is achieved via self recognition by basing the inhibitors on the sequence in this region. The inclusion of disubstituted amino acids in the sequence of the inhibitors will provide a blocking …
The Impact Of The Caernarvon Diversion On Above- And Belowground Marsh Biomass In The Breton Sound Estuary After Hurricane Katrina, Matthew Korbel Moerschbaecher
The Impact Of The Caernarvon Diversion On Above- And Belowground Marsh Biomass In The Breton Sound Estuary After Hurricane Katrina, Matthew Korbel Moerschbaecher
LSU Master's Theses
The purpose of this project was to monitor the recovery of marsh vegetation following Hurricane Katrina in the Breton Sound estuary, which is directly influenced by the Caernarvon freshwater diversion. From March 2006 until October 2007, we measured above- and belowground biomass, soil porewater nutrients (NOx, NH4, and PO4), porewater salinity, porewater sulfide concentrations, and soil redox potential bimonthly at duplicate Near (N), Intermediate (M), and Far (F) sites (with respect to the diversion), as well as at a Reference (C) site. End of season live (EOSL) below and above ground biomass was measured at 26 separate stations where vegetation …
Ethanol Production Using Continuous Multi-Staged Microbe Bioreactors: A Laboratory Study, William Bruce King
Ethanol Production Using Continuous Multi-Staged Microbe Bioreactors: A Laboratory Study, William Bruce King
LSU Master's Theses
Alternative fuels are important for the United States to reduce their dependence on fossil fuels. Currently, ethanol is the only renewable fuel that is produced in commercial quantity. The demand for ethanol is increasing throughout the world. The production of ethanol is limited by the available feedstocks and processing technology. Corn is the primary feedstock for ethanol in the United States. It is processed in either the wet milling or dry milling process. Both processes use either the batch or continuous fermentors. Both batch and continuous systems have operational restrictions with maintaining a good growth of yeast and preventing contamination …
A Multi-Scale Assessment Of Den Selection Of Louisiana Black Bears (Ursus Americanus Luteolus) In Northern And Central Louisiana, Annelie Crook Crook
A Multi-Scale Assessment Of Den Selection Of Louisiana Black Bears (Ursus Americanus Luteolus) In Northern And Central Louisiana, Annelie Crook Crook
LSU Master's Theses
Understanding den selection for the Louisiana black bear (Ursus americanus luteolus) may provide insight into habitat requirements of the subspecies and assist in conservation and management efforts. With that goal, I assessed den selection of female Louisiana black bears at multiple spatial scales in northern and central Louisiana. I used 230 den-years to examine den type (tree or ground), microhabitat characteristics at dens, and effects of landscape characteristics on den selection. We also evaluated tree availability and reuse. Solitary and parturient females selected tree dens more frequently (65%) than ground dens. However, tree dens were not required for successful denning …
Komatiitic Flows Of The Pioneer Ultramafic Complex Of The 3.3ga Weltevreden Formation, Barberton Greenstone Belt, South Africa: Stratigraphy, Petrology, And Geochemistry, Marc Romain Cooper
Komatiitic Flows Of The Pioneer Ultramafic Complex Of The 3.3ga Weltevreden Formation, Barberton Greenstone Belt, South Africa: Stratigraphy, Petrology, And Geochemistry, Marc Romain Cooper
LSU Master's Theses
The 3.29 Ga Pioneer Ultramafic Complex (WPC) is a 1 km thick east-northeast trending tilted (90° dip) section of layered ultramafic rock in the Weltevreden Formation in the west-northwest region of the Barberton Greenstone Belt (BGB). It was originally interpreted as an intrusive complex with slaty zones that have a linear horizontal fabric produced by shear. However, a recent study identifies these slaty zones as komatiitic tuffs and attributes their horizontal fabric to plane and cross bedding. The present study suggests the non-slaty zones are extrusive komatiitic flows with abundant pyroxene spinifex tops, normal volcanic textures and crystal sizes, and …
Two Post-Harvest Treatments For The Reduction Of Vibrio Vulnificus And Vibrio Parahaemolyticus In Eastern Oysters (Crassostrea Virginica), Kevin Patrick Melody
Two Post-Harvest Treatments For The Reduction Of Vibrio Vulnificus And Vibrio Parahaemolyticus In Eastern Oysters (Crassostrea Virginica), Kevin Patrick Melody
LSU Master's Theses
Vibrio vulnificus and V. parahaemolyticus are naturally occurring estuarine bacteria and the leading causes of seafood-borne illness in the United States. Multiple outbreaks due to raw oyster consumption in the last decade has lead to much research to remediate these bacteria from oysters destined for the half-shell market. The focus of this research was to investigate the efficacy of icing and high salinity exposure as two post-harvest treatments for the reduction in numbers of V. vulnificus and V. parahaemolyticus in commercial quantities of shellstock oysters. The icing experiment was conducted in the summer of 2006, and the high salinity trials …
Computed Tomography Imaging To Quantify Iodine Distribution In Iododeoxyuridine-Labeled Dna, Christopher Erik Welch
Computed Tomography Imaging To Quantify Iodine Distribution In Iododeoxyuridine-Labeled Dna, Christopher Erik Welch
LSU Master's Theses
Purpose: Treatment planning for x-ray activated Auger electron radiotherapy requires knowledge of the spatial distribution of Auger electron-producing target atoms in DNA; iodine is a candidate atom. Because planning uses computed tomography (CT) data to show anatomy, obtaining the target atoms' distribution with CT methods is an attractive goal. This study evaluates the ability of two available CT systems to measure the target atoms' spatial distribution. Method and Materials: A polychromatic desktop CT scanner and a synchrotron monochromatic CT system acquired images of iodine concentrations in water, ranging from 0.03-10 mg/ml. The polychromatic scanner was operated at 40 kVp while …
Dosimetry Intercomparison Using A 35-Kev X-Ray Synchrotron Beam, Scott Oves
Dosimetry Intercomparison Using A 35-Kev X-Ray Synchrotron Beam, Scott Oves
LSU Master's Theses
Significance: Photon activated Auger electron therapy utilizes a keV-ranged, monoenergetic x-ray beam, and radiobiological and animal experiments studying this therapy require accurate dosimetry techniques. However, there exist few dosimetry protocols for low-energy x-ray beams. This research intended to use the CAMD synchrotron as a source of monochromatic, 35-keV x-rays and test dosimetry techniques of film and ion chamber. The hypothesis of my research was that depth-dose measured in a PMMA phantom using an air-equivalent ionization chamber and radiochromic film dosimeters in a PMMA phantom irradiated by a 35-keV, monochromatic x-ray beam will agree to within 5% of each other and …
Non-Industrial Private Forest Landowners And Us Home Center Retailers' Attitudes And Perceptions Of Forest Certification, Polwattage Kushil Perera
Non-Industrial Private Forest Landowners And Us Home Center Retailers' Attitudes And Perceptions Of Forest Certification, Polwattage Kushil Perera
LSU Master's Theses
The concept of forest certification, a relatively recent development in forestry, is based on the use of market-based incentives to encourage sustainable forest management practices. Since the majority of forests in US South are privately owned, certifying forests owned by non-industrial private forest (NIPF) landowners is an important issue. From the demand perspective of certification, pressure from non-governmental environmental organizations and consumer awareness has prompted major wood products retailers to state preferences for certified wood products. In the US, wood product demand in the retail home centers sector is second only to the home building industry. In addition, home center …
Wetland Mitigation Banks And The No-Net-Loss Requirement: An Evaluation Of The Section 404 Permit Program In Southeast Louisiana, Abbey Anne Tyrna
Wetland Mitigation Banks And The No-Net-Loss Requirement: An Evaluation Of The Section 404 Permit Program In Southeast Louisiana, Abbey Anne Tyrna
LSU Master's Theses
Section 404 of the Clean Water Act provides regulatory oversight for wetland conservation. One goal of the Section 404 program is to achieve a no-net-loss of the remaining wetland acres and functions. Wetland mitigation banks have been incorporated into wetland policy because of their potential advantage in achieving the no-net-loss requirements. This study analyzed four wetland mitigation banks with credits sold between 1991 and 2007 in southeastern Louisiana to determine if they were contributing to the goal of no-net-loss. The goal of no-net-loss is reached when there is complete compensation of wetland structure and function. The study area for this …
An Analysis Of The Benefits And Patterns Of Public Support For Urban Forestry Programs, Barbi Marisa Landano
An Analysis Of The Benefits And Patterns Of Public Support For Urban Forestry Programs, Barbi Marisa Landano
LSU Master's Theses
Trees are an essential element in a healthy urban community. They provide many benefits if they are properly managed and maintained throughout their lives. In order to accomplish this, urban forestry programs need to be established and there needs to be a good support system within the city. The objectives of this study are to identify key factors that may influence public support for urban forestry programs and to examine the role of nonprofit organizations in building support for and implementing urban forest programs. Surveys of Baton Rouge, Louisiana residents were conducted to identify the variables that are associated with …
Influences On Effective Local Wildfire Mitigation Programs, Kimberly Ann Geaghan
Influences On Effective Local Wildfire Mitigation Programs, Kimberly Ann Geaghan
LSU Master's Theses
The purpose of this research is to identify key components of community wildfire risk reduction programs and potential influences on the adoption of these program elements. Community wildfire programs have been developed to educate and encourage property owners to adopt “vegetation management” practices such as creating defensible space around structures, landscaping with fire-resistant plants, and removing potential wildfire fuels such as trees and shrubs. The analyses are based on a survey conducted by investigators from Louisiana State University in conjunction with the U.S. Forest Service. This survey was distributed to wildfire mitigation program managers listed on the National Wildfire Programs …
Modeling And Design Of Low Cost Customizable Household Robot, Bharat Narahari
Modeling And Design Of Low Cost Customizable Household Robot, Bharat Narahari
LSU Master's Theses
Just as the growth of Personal computer, Mobile phones and Automobiles took place in last 3 decades, the personal robotics industry still in its nascent stage, is heading in the same direction. This thesis explores the concept of customizable household robots (CHR) in the robotics community. An attempt has been made to design a customizable robot by extending the 2 wheel differential drive kinematic model to 4 wheel independent differential drive kinematic model. A framework for CHR is developed which will be able to do various household repetitive tasks. Just as we can assemble a PC by buying its individual …
Evaluating The Economic And Environmental Impacts Of Water Subsidies In Kuwait, Mohammad Alshawaf
Evaluating The Economic And Environmental Impacts Of Water Subsidies In Kuwait, Mohammad Alshawaf
LSU Master's Theses
Kuwait and the other Gulf Cooperation Council (GCC) states have experienced rapid growth in population coupled with a rise in the standards of living and acceleration in social, agricultural, and industrial growths, which greatly increased the demand for water supplies. Due to the scarcity of water resources in the region, non-conventional water supplies such as seawater desalination are and have been the main water resource. Kuwait has so far been able to meet demand by using its access to both the sea and abundant oil needed in the desalination plants. The quantity of water consumed per capita in Kuwait is …
An Evaluation Of The Perceived Obstacles For Policy Officials Regulating The Post Harvest Treatment Of Raw Oysters To Control The Human Health Vibrio Vulnificus Problem, Amy Leah Oestringer
An Evaluation Of The Perceived Obstacles For Policy Officials Regulating The Post Harvest Treatment Of Raw Oysters To Control The Human Health Vibrio Vulnificus Problem, Amy Leah Oestringer
LSU Master's Theses
Vibrio vulnificus is the leading pathogen linked to seafood-associated deaths. This naturally occurring marine bacterium presents a human health risk when it is consumed in raw oysters. Hospitalization is necessary in 90 % Vibrio vulnificus illnesses and 40% end in death. (CDC) Several guidelines and regulations have been enacted to combat this human health issue, but have failed to reduce the steadily rising illness rate. Post-harvest processing requirements for raw oysters could be used to reduce illness rates. A survey was conducted to measure the perceived obstacles that regulators and industry representatives of the raw oyster industry face in policymaking …
Opportunities And Challenges Associated With Development Of Wood Biomass Energy Production In Louisiana, Anil Raj Kizhakkepurakkal
Opportunities And Challenges Associated With Development Of Wood Biomass Energy Production In Louisiana, Anil Raj Kizhakkepurakkal
LSU Master's Theses
Wood residue produced by forest products industry has been recognized as a potential fuel that can generate energy to run the industry. A survey was done among forest products industry to get a general idea about energy produced from woody biomass created from forest industry in Louisiana, USA. The industry was classified into primary and secondary forest products industry. The study provided information regarding utilization and wastage of wood residue. Survey response rate was 25 percent. It addressed problems faced by wood residue energy development and came up with solution to solve them. When survey results were compared to previous …
Dynamic Workflow Management For Large Scale Scientific Applications, Emir Mahmut Bahsi
Dynamic Workflow Management For Large Scale Scientific Applications, Emir Mahmut Bahsi
LSU Master's Theses
The increasing computational and data requirements of scientific applications have made the usage of large clustered systems as well as distributed resources inevitable. Although executing large applications in these environments brings increased performance, the automation of the process becomes more and more challenging. The use of complex workflow management systems has been a viable solution for this automation process. In this thesis, we study a broad range of workflow management tools and compare their capabilities especially in terms of dynamic and conditional structures they support, which are crucial for the automation of complex applications. We then apply some of these …
The Impacts Of River Impoundment: A Case Study Of H. Neely Henry Lake In Northeast Alabama, Willis Scott Estis
The Impacts Of River Impoundment: A Case Study Of H. Neely Henry Lake In Northeast Alabama, Willis Scott Estis
LSU Master's Theses
Dam building is one of the methods that modern civilization uses in an attempt to harness the power of nature. These dams and the impoundments associated with them can contribute numerous positive impacts to the surrounding human population. Unfortunately, there are negative impacts as well. This research focuses on one impoundment in particular, H. Neely Henry Lake in northeast Alabama (an impoundment of the Coosa River). Site-specific information regarding the H. Neely Henry development is explored including area geography, history, and the formation of the Alabama Power Company – the agency responsible for H. Neely Henry and other Coosa River …
Feasibility Testing For Salsa Neutrino Astrophysics Project, Jarrod Christopher Marsh
Feasibility Testing For Salsa Neutrino Astrophysics Project, Jarrod Christopher Marsh
LSU Master's Theses
Research is presented that was performed to determine possible locations for a full scale Salt Dome Shower Array (SalSA) neutrino telescope sensitive to energies from TeV ($10^{12}$ eV), PeV ($10^{15}$ eV), and EeV ($10^{18}$ eV) neutrinos. A detector to test possible site locations was designed around a half-Watt Ham radio to transmit short pulses of 145.500 MHz radiation. The research began by designing the system. Several phases of design took place as the system was refined and calibrated. Once finished, it was taken into a field and tested. The objective was to determine how the signals depended on distance. In …
Evaluating Ecological Equivalence In Created Marshes, Christopher Bromley Llewellyn
Evaluating Ecological Equivalence In Created Marshes, Christopher Bromley Llewellyn
LSU Master's Theses
The overall goal of coastal wetland restoration is to achieve ecological equivalence through the reproduction of structural and functional characteristics. This study sought to examine ecological equivalence using a chronosequence of temporal replicates of created marshes using traditional structural measures of equivalence and tested the use of stable isotopes as a measure of functional equivalence. The objectives of this study were to: (1) compare measures of structural equivalence at created and reference marshes; (2) use stable isotope analysis of blue crab muscle and hepatopancreas tissues to compare functional equivalence at created and reference marshes; and (3) determine if there is …
Pileated Woodpeckers (Dryocopus Pileatus) And Saproxylic Beetles In Partial Cut And Uncut Bottomland Hardwood Forests, Patricia Jean Newell
Pileated Woodpeckers (Dryocopus Pileatus) And Saproxylic Beetles In Partial Cut And Uncut Bottomland Hardwood Forests, Patricia Jean Newell
LSU Master's Theses
Relative abundance and species richness of saproxylic beetles and nesting, roosting, and foraging ecology of pileated woodpeckers were studied in recent partial cuts and uncut forest during the summers of 2006 and 2007. Relative abundance of saproxylic beetles was greater in one-year old cuts than uncut forest during 2006 but was not consistent during 2007. The number of dead trees, period of capture, and trapping year also influenced beetle abundance. Species richness was similar in partial cuts and uncut forest. Characteristics of habitat used by pileated woodpeckers for nesting and roosting in one-year-old and two-year-old partial cuts and uncut forest …
Model-Driven Search-Based Loop Fusion Optimization For Handwritten Code, Pamela Bhattacharya
Model-Driven Search-Based Loop Fusion Optimization For Handwritten Code, Pamela Bhattacharya
LSU Master's Theses
The Tensor Contraction Engine (TCE) is a compiler that translates high-level, mathematical tensor contraction expressions into efficient, parallel Fortran code. A pair of optimizations in the TCE, the fusion and tiling optimizations, have proven successful for minimizing disk-to-memory traffic for dense tensor computations. While other optimizations are specific to tensor contraction expressions, these two model-driven search-based optimization algorithms could also be useful for optimizing handwritten dense array computations to minimize disk to memory traffic. In this thesis, we show how to apply the loop fusion algorithm to handwritten code in a procedural language. While in the TCE the loop fusion …