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Articles 1 - 30 of 133
Full-Text Articles in Engineering
Fixed Platform Crane For Equipment Access, Carlos Gonzalez, Steven Hollander, Yue Zhao, Jared Pellegrin, Travis Odom
Fixed Platform Crane For Equipment Access, Carlos Gonzalez, Steven Hollander, Yue Zhao, Jared Pellegrin, Travis Odom
Honors Theses
No abstract provided.
Characterization Of Mc252 Subtidal And Intertidal Oil Mats On A Coastal Headland Beach, Allyson C. Lutz
Characterization Of Mc252 Subtidal And Intertidal Oil Mats On A Coastal Headland Beach, Allyson C. Lutz
Honors Theses
No abstract provided.
Mobile Marksman Iv, Nicolas Moreau
Experimental Investigation Of Injectivity In Unconsolidated Formations, Callie Pritchett
Experimental Investigation Of Injectivity In Unconsolidated Formations, Callie Pritchett
Honors Theses
No abstract provided.
In Vivo Evaluation Of An Automated Pressure Sore Reducer, Linda J. Cross
In Vivo Evaluation Of An Automated Pressure Sore Reducer, Linda J. Cross
Honors Theses
No abstract provided.
Design Of Low Power Alternative Energy Systems With Applications To Experimental Education, Xingjian ‘Harry’ Gao
Design Of Low Power Alternative Energy Systems With Applications To Experimental Education, Xingjian ‘Harry’ Gao
Honors Theses
No abstract provided.
Cryoprotectant Loading In A Microchannel, Shelby Pursley
Cryoprotectant Loading In A Microchannel, Shelby Pursley
Honors Theses
No abstract provided.
Computational Modeling Of Drug Release From Bone Scaffolds, Corey Landry
Computational Modeling Of Drug Release From Bone Scaffolds, Corey Landry
Honors Theses
No abstract provided.
Engineering Behavior And Characterization Of Biomass Ashes Using Geotechnical Measurement Techniques, Francisco Javier Grau Sacoto
Engineering Behavior And Characterization Of Biomass Ashes Using Geotechnical Measurement Techniques, Francisco Javier Grau Sacoto
LSU Master's Theses
Biomass, the organic material derived from plants or animals in a biological process, has rapidly become a topic of worldwide interest. The need to find new types of renewable energy sources has led to the use of natural materials as an economic, sustainable and environmental alternative. Biomass can be used to produce biofuel after a conversion process. The combustion of biomass matter –which is mainly produced in industrial plants- becomes biomass ash, which contains macronutrients and micronutrients. Currently, the recycling potential is wasted and most of the biomass ash is dumped without control or just disposed in landfills. The main …
Physical Stability Of Poly (Lactic-Co-Glycolic Acid) And Plga/Chitosan Nanoparticles And Chemical Stability Of Entrapped Alpha-Tocopherol And Lutein, Meocha Whaley
LSU Master's Theses
The published benefits of polymeric nanoparticles as a system for antioxidant delivery have encompassed topics of improved oral delivery, bioavailability, and modified release to name a few. Generally accepted as safe polymers Poly(lactic-coglycolic acid) and the mucoadhesive chitosan were selected to entrap alpha-tocopherol and lutein. This study proposed to assess the physical stability of PLGA and Chi/PLGA nanoparticles with entrapped bioactives in varying biological suspension medias ( water, pbs, hbss and cell media). Also, to assess the chemical stability of the entrapped antioxidants lutein and alpha-tocopherol within the same media as deemed relevant for in-vitro and and in-vivo studies. Of …
Spectrum Sensing, Spectrum Monitoring, And Security In Cognitive Radios, Erfan Soltanmohammadi
Spectrum Sensing, Spectrum Monitoring, And Security In Cognitive Radios, Erfan Soltanmohammadi
LSU Doctoral Dissertations
Spectrum sensing is a key function of cognitive radios and is used to determine whether a primary user is present in the channel or not. In this dissertation, we formulate and solve the generalized likelihood ratio test (GLRT) for spectrum sensing when both primary user transmitter and the secondary user receiver are equipped with multiple antennas. We do not assume any prior information about the channel statistics or the primary user’s signal structure. Two cases are considered when the secondary user is aware of the energy of the noise and when it is not. The final test statistics derived from …
Meso-Scale Analysis Of Deformation Induced Heating In Granular Metalized Explosives By Piston Supported Waves, Sunada Srinath Nagamani Chakravarthy
Meso-Scale Analysis Of Deformation Induced Heating In Granular Metalized Explosives By Piston Supported Waves, Sunada Srinath Nagamani Chakravarthy
LSU Doctoral Dissertations
Shock sensitivity of heterogeneous explosive composites is dependent on the formation of hot-spots which are small regions of elevated temperatures within the material. Changes in the initial meso-structure (i.e. packing density, composition, particle size and shapes) of the explosives can significantly alter the hot-spot fields in the material and thereby affect its shock sensitivity. In this study, an explicit, 2D, Lagrangian finite and discrete element technique is used to numerically simulate the deformation induced heating of granular mixtures of explosive (HMX), and metal (Al) particles due to piston supported uniaxial deformation waves (400 ≤ Up ≤ 800 m/s). A number …
Synthesis And Characterization Of Novel Polyester Scaffolds From Sugarcane Industry By-Products For Use In Skin And Bone Tissue Engineering, Akanksha Kanitkar
Synthesis And Characterization Of Novel Polyester Scaffolds From Sugarcane Industry By-Products For Use In Skin And Bone Tissue Engineering, Akanksha Kanitkar
LSU Doctoral Dissertations
The aim of this work was to synthesize non-toxic, biodegradable polyesters of aconitic acid, cinnamic acid and glycerol from by-products of the sugarcane industry as scaffolds for skin and bone tissue engineering. Utilizing the by-products, molasses and sugarcane bagasse, not only add value to the cane industry, but also paves path for synthesizing novel bio-based materials from the isolated specialty chemicals. Molasses contain an economically recoverable quantity of aconitic acid and its extraction was studied in detail as a part of this work. The yields of recovered aconitic acid varied from 25–69% depending on the extraction conditions. Under all the …
Graphical Models In Characterizing The Dependency Relationship In Wireless Networks And Social Networks, Phuoc Doan Huu Vu
Graphical Models In Characterizing The Dependency Relationship In Wireless Networks And Social Networks, Phuoc Doan Huu Vu
LSU Master's Theses
Semi-Markov processes have become increasingly important in probability and statistical modeling, which have found applications in traffic analysis, reliability and maintenance, survival analysis, performance evaluation, biology, DNA analysis, risk processes, insurance and finance, earthquake modeling, etc. In the first part of this thesis, our focus is on applying semi-Markov processes to modeling the on-off duty cycles of different nodes in wireless networks. More specifically, we are interested in restoration of statistics of individual occupancy patterns of specific users based on wireless RF observation traces. In particular, we present a novel approach to finding the statistics of several operations, namely down-sampling, …
Evaluation Of Different Harvesting And Storage Practices: Sweet Sorghum And Energycane, Ana Lucia Amaya Arroyave
Evaluation Of Different Harvesting And Storage Practices: Sweet Sorghum And Energycane, Ana Lucia Amaya Arroyave
LSU Master's Theses
Two attractive potential feed stocks for biofuel production are energycane and sweet sorghum due to the environmental adaptability, sugars concentration and yield. Evaluation and development of harvesting, transportation and storage practices is critical for bringing the production of these crops to industrial levels. This research aims to analyze the supply system of energy crops and evaluate the effect of different harvesting and storage in the yields of the feedstock and the efficiencies of the processes. Harvesting trials were conducted at St. Gabriel, LA for evaluating the feasibility of using energy crops as inputs for ethanol production. The parameters that were …
Biogeochemical Controls On Fate Of Subsurface Oiled Sands On A Coastal Headland Beach, Autumn Anastasia Westrick
Biogeochemical Controls On Fate Of Subsurface Oiled Sands On A Coastal Headland Beach, Autumn Anastasia Westrick
LSU Master's Theses
The fate of subsurface oiled sands collected from Fourchon Beach in Louisiana were determined while modifying biogeochemical controls on the degradation of PAHs. Groundwater on the beach has intrinsically low dissolved oxygen concentrations, which may limit natural biodegradation of the crude oil components. The intent of this research was to characterize the biogeochemical properties and degradability of oiled sands (with >10% of pore filled with MC252 oil) using a combination of laboratory flow-through reactor studies, field measurements and time-series microelectrode profiles of down-flow and cross flow geometries. Reactor experiments indicate that optimal conditions for substantial oil degradation are aerobic under …
Localization And Security Algorithms For Wireless Sensor Networks And The Usage Of Signals Of Opportunity, Gustavo Andres Chacon Rojas
Localization And Security Algorithms For Wireless Sensor Networks And The Usage Of Signals Of Opportunity, Gustavo Andres Chacon Rojas
LSU Doctoral Dissertations
In this dissertation we consider the problem of localization of wireless devices in environments and applications where GPS (Global Positioning System) is not a viable option. The _x000C_rst part of the dissertation studies a novel positioning system based on narrowband radio frequency (RF) signals of opportunity, and develops near optimum estimation algorithms for localization of a mobile receiver. It is assumed that a reference receiver (RR) with known position is available to aid with the positioning of the mobile receiver (MR). The new positioning system is reminiscent of GPS and involves two similar estimation problems. The _x000C_rst is localization using …
Biogeochemical Controls On Biodegradation Of Mc252 Crude Oil In Coastal Wetland Systems, Matthew Paul Rodrigue
Biogeochemical Controls On Biodegradation Of Mc252 Crude Oil In Coastal Wetland Systems, Matthew Paul Rodrigue
LSU Master's Theses
Weathering of MC252 oil from the Deepwater Horizon oil spill is taking place in coastal Louisiana marsh and mangrove wetland systems. Alkylated phenanthrenes and dibenzothiophenes, which are the most prominent PAHs found at MC252 contaminated sites, are weathering at rates up to 5% per year relative to alkylated chrysenes 3 years after initial oiling. Flux chambers at marsh locations trapped CO2 that exhibited δ13C signatures lower than indigenous organic matter signifying hydrocarbon mineralization to CO2. Weathering rates at each of these locations are heavily influenced by the biogeochemistry of the surrounding environment. High-resolution nutrient profiles were obtained at different locations …
Fabrication And Enhancement Of Aluminum-Based Microchannel Devices, Paul Joseph Hymel
Fabrication And Enhancement Of Aluminum-Based Microchannel Devices, Paul Joseph Hymel
LSU Master's Theses
Microscale molding replication and transient liquid phase (TLP) bonding were used to fabricate Al-based microchannel heat exchangers (MHEs) and micro gas chromatograph (mGC) columns. Metal-based microchannel heat exchangers often experience corrosion as a result of their operating conditions. To address this problem, an internal anodization method was developed in Al microtubes by pulsing the flow of electrolyte through a microtube when the current dropped below a set value. The anodic aluminum oxide (AAO) films were characterized by scanning electron microscopy (SEM), focused ion beam (FIB) cross sections, and X-ray energy dispersive spectroscopy (EDS) to determine their growth rate and morphology. …
The Effects Of Concurrent Driving And In-Vehicle Tasks: A Multivariate Statistical Analysis Of Driver Distraction In A High-Fidelity Driving Simulator, Julius A. Codjoe
The Effects Of Concurrent Driving And In-Vehicle Tasks: A Multivariate Statistical Analysis Of Driver Distraction In A High-Fidelity Driving Simulator, Julius A. Codjoe
LSU Doctoral Dissertations
Distracted driving continues to remain a cause of concern for a number of bodies, including government agencies, traffic safety advocacy groups and law enforcement agencies, because of its traffic safety risks. The driving simulator continues to be popular with researchers in collecting data on performance variables that provide scientific knowledge of the effects of distracted driving. Several of these performance variables can be used to quantify a single distracting effect, resulting in a multivariate dataset. A literature review of related studies revealed that researchers overwhelmingly use univariate (single and multiple) tests to analyze the resulting dataset. Performing multiple univariate tests …
Electrochemical Reduction Of Co2 On Supported Cu2o Catalysts, Joel Niño Galvez Bugayong
Electrochemical Reduction Of Co2 On Supported Cu2o Catalysts, Joel Niño Galvez Bugayong
LSU Doctoral Dissertations
We have examined Cu-based catalyst materials that enable the conversion of CO2 to useful products such as fuels and chemical feedstocks by electrochemical reduction. In particular, we compared the electrocatalytic activity of supported Cu2O particles prepared using electrodeposition and wet chemical methods. The particles had cubic structure, ranging in size from 40 nm to 900 nm and consisting of low index planes. We observed significantly different product distribution on these catalysts compared to polycrystalline Cu, specifically for methane and ethylene formation. While Cu particles showed higher faradaic efficiency for methane formation compared to ethylene formation, we observed that Cu2O particles …
Rare Earth/Transition Metal Oxides For Syngas Cleanup, Rui Li
Rare Earth/Transition Metal Oxides For Syngas Cleanup, Rui Li
LSU Doctoral Dissertations
Syngas from gasification of biomass or biomass and coal is a potential source of renewable energy. However, byproducts such as H2S and tars must be removed before further utilization or processing of syngas. Rare earth oxides (REOs, e.g., Ce/LaOx (1.7< x <2)) mixed with transition metals (e.g., Mn, Fe) were synthesized by various methods, and in some cases supported on a thermally stable alumina. Both desulfurization and tar reforming experiments were conducted at high temperatures under similar conditions with synthetic effluents in order to achieve better heat integration and higher yield to desired products CO and H2. The sulfur capacities at temperatures from 900-1025 K with air regeneration were measured for repeat cycles until a stable, reversible capacity was obtained. The oxidized and sulfided (reduced) sorbents were characterized by XRD, XANES, XAFS, TPR and BET. Density functional theory calculations were used to aid in interpreting characterization data and in explaining the enhanced S adsorption capacities. The results showed that mixed REOs, such as Ce/Tb, and Ce/La synthesized by a templated sol-gel approach do not have high sulfur capacities. The presence of either CO2 or H2O inhibits the adsorption of H2S. However, addition of Mn to REOs effectively increased the sulfur capacity, and Mn-REO sorbents are regenerable even in the presence of air, although there is some sulfate formation. The formation of elemental sulfur during regeneration could be related to the oxygen vacancies promoted by doping Mn into the ceria lattice. DFT calculations suggested doping Mn into CeO2 decreased the vacancy formation energies and lowered the H2S adsorption energy. In contrast, for MnO-doped REOs supported on ã-Al2O3, although their surface areas remained high after multi-cycle usage, the probable formation of MnAl2O4 as observed by XANES reduces the sulfur capacities. Reforming experiments were carried out using synthetic syngas mixtures with C10H8 as a tar model compound, both with and without H2S. The results showed that CO2 and H2O inhibit the reforming activities to some extent. Fe- or Mn-doped supported REOs are promising tar cleanup catalysts. They exhibited higher sulfur tolerance, less coking, and less methanation than typical Ni-based high temperature reforming catalysts. This behavior is in part attributed to enhanced generation of oxygen vacancies in the doped REOs.
Modeling The Effect Of Gusty Hurricane Wind Force On Vehicles Using The Lsu Driving Simulator, Jose Manuel Rodriguez
Modeling The Effect Of Gusty Hurricane Wind Force On Vehicles Using The Lsu Driving Simulator, Jose Manuel Rodriguez
LSU Master's Theses
While traffic planning is important for developing a hurricane evacuation plan, vehicle performance on the roads during extreme weather conditions is critical to the success of the planning process. This study was designed to lay a foundation for modeling driving behavior and vehicle performance as an assessment tool in the decision making process for planning evacuation routes during hurricane and tropical storms. The study explores how the parameters of a driving simulator could be modified to reproduce wind loadings experienced by three vehicle types (a passenger car, an ambulance, and a bus) during gusty hurricane winds, through manipulation of appropriate …
Physico-Chemical Properties Of Green Leaf Volatiles, Harsha Satyanarayana Vempati
Physico-Chemical Properties Of Green Leaf Volatiles, Harsha Satyanarayana Vempati
LSU Master's Theses
Green Leaf Volatiles (GLVs) is a class of vegetation emissions whose release is greatly enhanced in the event of thermal or mechanical stress. These oxygenated hydrocarbons that have been identified as a potential source of Secondary Organic Aerosols (SOA) via aqueous oxidation. The physico-chemical properties of GLVs are vital to understanding their fate and transport in the atmosphere, but few experimental data are available. We studied the aqueous solubility, 1-Octanol/Water Partition Coefficient, and Henry’s Constant (KH) of five GLVs at 25&176;C: methyl jasmonate, methyl salicylate, 2-methyl-3-buten-2-ol, cis-3-hexen-1-ol, and cis-3-hexenyl acetate. Henry’s constant was additionally measured at 30&176;C & 35&176;C, and …
Damage Prediction Of Low-Rise Buildings Under Hurricane Winds, Fang Pan
Damage Prediction Of Low-Rise Buildings Under Hurricane Winds, Fang Pan
LSU Doctoral Dissertations
Low-rise buildings are defined as the buildings with a mean roof height less than the least horizontal dimension and less than 18.3 m in ASCE 7-10. They represent the majority of commercial, residential, and industrial buildings. Approximate 90% of the existing low-rise residential buildings are constructed as wood light-frame buildings that are not fully engineered and thus more vulnerable to extreme wind pressures, wind borne debris and rain water intrusion. The resulting hurricane-induced economic loss is primarily attributed to the insufficient performance of building envelope instead of the catastrophic failure of their main structural system for Category 1 to 4 …
Numerical Investigation Of Cryopreserved Zebrafish Sperm Cell Activation In Microchannels, Thomas Foster Scherr
Numerical Investigation Of Cryopreserved Zebrafish Sperm Cell Activation In Microchannels, Thomas Foster Scherr
LSU Doctoral Dissertations
This aim of this research project is to probe the activation process of zebrafish spermatozoa. Zebrafish are a model species for biological engineering applications, and the cryopreservation of their reproductive cells allows for inexpensive cataloging and maintenance of valuable biological material. Evaluation of cryopreservation protocols for aquatic sperm cells is typically accomplished by motility analysis after subjecting cells to a cryopreservation treatment. In zebrafish sperm cells, motility is initiated when cells come into contact with a hypo-osmotic environment. Subsequent activation analysis is currently done manually and brings with it an inherent difficulty and error. This process is slow and not …
Poroelastic Inhomogeneities: Applications In Reservoir Geomechanics, Houman Bedayat
Poroelastic Inhomogeneities: Applications In Reservoir Geomechanics, Houman Bedayat
LSU Doctoral Dissertations
The scarce amount of conventional hydrocarbon reservoirs and increase of fuel consumption in the world have made production from unconventional hydrocarbon resources inevitable. Because of the low permeability of unconventional formations, fractures are the main paths for the fluid to flow. Therefore, detailed knowledge of the size, orientation, and permeability of the fracture systems are essential for reservoir engineers. Permeability of the fractures is function of their volume and opening, and stress and fluid pore pressure distribution in the formation. Since reservoir pressure may change over the production life of the reservoir, studying stress redistribution and mechanical behavior of the …
Evaluation Of Triploid Oysters As A Tool To Assess Short- And Long-Term Seafood Contamination Of Oil Spill-Impacted Areas, Martin Scott Miles
Evaluation Of Triploid Oysters As A Tool To Assess Short- And Long-Term Seafood Contamination Of Oil Spill-Impacted Areas, Martin Scott Miles
LSU Doctoral Dissertations
Many of the organic components of oil have the capacity to persist in the environment, bioaccumulate in tissues, and are toxic to surrounding organisms. Since the early 1970s, environmental assessment programs have utilized bivalves as monitoring tools of chemical contaminants in the marine environment. Because of their sedentary and filter-feeding habit (bioaccumulation), mussels and oysters been employed as sentinel organisms in environmental quality monitoring studies in coastal ecosystems. The use of indigenous (diploid) bivalves for biomonitoring water quality is limited during the summer months due to high stress and changes in biochemical composition induced by reproductive development. In this work …
Mechanical And Thermal Properties Of Fly Ash-Based Geopolymer Cement, Fenghong Fan
Mechanical And Thermal Properties Of Fly Ash-Based Geopolymer Cement, Fenghong Fan
LSU Master's Theses
The geopolymer concrete is a more durable and green material with less CO2 emission and less energy consuming as compared with the widely used Portland cement (PC) concrete. In this thesis, an experimental study of the thermo-mechanical properties of a cement prepared using a class F fly ash and three different alkali-activators (NaOH activator, NaOH and Na2SiO3 mixture activator, and KOH and Na2SiO3 mixture activator) is presented. The mechanical properties, including the compressive strength, shrinkage, weight loss, and chemical composition, are investigated utilizing several key tools, such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy …
Biodegradation Of Mc252 Crude Oil After Mobilization By Washover Events On Coastal Headland Beaches, David Nelson Curtis
Biodegradation Of Mc252 Crude Oil After Mobilization By Washover Events On Coastal Headland Beaches, David Nelson Curtis
LSU Master's Theses
Washover events on coastal headland beaches occur when storm surge from cold fronts, high tides, tropical storms, and hurricanes move across the beach, reworking and depositing sand in the back marshes and shallow mudflat areas. On Fourchon Beach, Louisiana, a 9-mile coastal headland beach impacted by the Deep Water Horizon oil spill, these washover events have intermittently moved oil from the subtidal and intertidal portion of the beach to the supratidal mudflats and marsh areas. In order to determine the impacts of washover events on oil fate, 3 complementary studies were undertaken. First, washover areas (N=59) have been mapped and …