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Articles 2101 - 2130 of 2820
Full-Text Articles in Engineering
Bayesian Model Averaging On Hydraulic Conductivity Estimation And Groundwater Head Prediction, Xiaobao Li
Bayesian Model Averaging On Hydraulic Conductivity Estimation And Groundwater Head Prediction, Xiaobao Li
LSU Doctoral Dissertations
Characterization of aquifer heterogeneity is inherently difficult because of the insufficiency of data, the inflexibility of parameterization methods, and non-uniqueness of parameterization methods. Groundwater predictions are greatly affected by multiple interpretations of aquifer properties and the uncertainties of model parameters. This study introduces a Bayesian model averaging (BMA) method along with multiple generalized parameterization (GP) methods to identify hydraulic conductivity and along with multiple simulation models to predict groundwater head and quantify the prediction uncertainty. Two major issues about BMA are discussed. The first problem is with using Occam’s window in usual BMA applications. Occam’s window only accepts models in …
Replication Of Metal-Based Microscale Structures By Compression Molding: A Combined Experimental And Finite Element Analysis Study, Jing Jiang
LSU Doctoral Dissertations
Fabrication of microscale Ta mold inserts by micro-electrical-discharge-machining (ìEDM) is reported. Morphology, chemistry, and structure of the near-surface region of as-machined Ta blanks have been characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. A TaC surface layer forms on as-machined Ta surfaces. This altered surface layer was removed by electro-chemical-polishing. Further modification of Ta insert surfaces was accomplished by deposition of a conformal Ti-containing hydrogenated carbon coating. We demonstrate successful replication of high-aspect-ratio microscale structures (HARMS) in Al and Cu by compression molding with such surface-engineered Ta mold inserts. In addition, a hybrid microfabrication technique, combining …
Heterogeneous Catalyzed Macromolecular Hydrogenations In Oscillating Systems, Alan Bussard
Heterogeneous Catalyzed Macromolecular Hydrogenations In Oscillating Systems, Alan Bussard
LSU Doctoral Dissertations
An examination of novel oscillatory (alternating gas and liquid phase) reactors and heterogeneous catalysts for multi-phase macromolecular reactions was carried out. A monolith-containing square die with Pd/Al2O3 catalysts was used to successfully hydrogenate poly(styrene) (PS). The inherent pulse behavior of the extruder was found to be sufficient to approach intrinsic kinetics at low polymer concentrations. At higher (10 wt% PS) concentrations, forced pulsing was shown to have a greater impact on observed reaction rates. Selectivity with this extruder-fed reactor was better than with a stirred tank in all cases, due to a more plug-flow-like residence time distribution. While accurate control …
Cryopreservation Of Adipose Derived Adult Stem Cells And Multidimensional Cell Sheets, Sreedhar Thirumala
Cryopreservation Of Adipose Derived Adult Stem Cells And Multidimensional Cell Sheets, Sreedhar Thirumala
LSU Doctoral Dissertations
Human adipose tissue provides a uniquely abundant and accessible source of adult stem cells. In response to chemical, hormonal or structural stimuli, these human adipose-derived adult stem (ASCs) cells can differentiate along multiple lineage pathways, including adipocytes, chondrocytes, myocytes, neurons and osteoblasts. Successful cryopreservation of scientifically and commercially important ASCs would revolutionize the tissue engineering and regenerative medicine industry. In this research, we have investigated the water transport phenomenon during freezing of several passages of adipose derived adult stem cells and generated the membrane permeability parameters in the presence and absence of cryoprotective agents. These measured permeability parameters were then …
Catalytic Synthesis Of Ethanol From Biomass-Derived Syngas, Adefemi Adelanwa Egbebi
Catalytic Synthesis Of Ethanol From Biomass-Derived Syngas, Adefemi Adelanwa Egbebi
LSU Doctoral Dissertations
Syngas produced by gasification of biomass or coal can be converted directly to ethanol and higher alcohols by processes based on heterogeneous catalysts. Ethanol can be used as a neat fuel or fuel additive or as a hydrogen carrier. Rhodium-based catalysts have been found to be most selective for the formation of C2 oxygenates from the hydrogenation of CO when suitably promoted. Here, we explore the effects of Mn, Fe, and Li promoters on Rh/TiO2. Rh-TiO2, Rh-Li/TiO2, Rh-Mn/TiO2, Rh-Mn-Li/TiO2 and Rh-Mn-Li-Fe/TiO2 catalysts were tested for the hydrogenation of CO …
A Capacity-Approaching Coded Modulation Scheme For Non-Coherent Fading Channels, Youngjeon Cho
A Capacity-Approaching Coded Modulation Scheme For Non-Coherent Fading Channels, Youngjeon Cho
LSU Master's Theses
Approaching the Shannon limit of the communication channels has been studied by many researchers to efficiently and reliably transmit data through the channels. To solve this problem, various methods and schemes have been proposed for approaching the theoretical limit for Shannon’s channel capacity. Among them, both low-density parity check (LDPC) codes and Turbo codes have been proposed to minimize the bit error rate (BER). Therefore, understanding of LDPC codes and Turbo codes is useful for their applications in modern communication systems. The study about non-coherent channels, which do not require explicit knowledge or estimation of the channel state information, has …
Analysis Of Gas Dynamic Waves In Explosively Actuated Valves, Blaise H. Paul
Analysis Of Gas Dynamic Waves In Explosively Actuated Valves, Blaise H. Paul
LSU Master's Theses
A mathematical model is formulated for assessing quasi-one-dimensional gas dynamics occurring within axis-symmetric explosively actuated valves. The model describes complete valve operation and accounts for pressure-dependent explosive combustion within an actuator, compressible product gas flow within the actuator, through a small port, and into and within a gas expansion chamber. The gas dynamic waves induce piston motion at the terminal end of the expansion chamber which is needed for valve operation. The model is mathematically posed as an initial-boundary-value problem in terms of generalized coordinates to facilitate numerical computations on a domain that volumetrically expands due to combustion and piston …
Optimization Of Treatment Of Chlorinated Volatile Organic Compound Mixtures In Constructed Wetlands: Vegetation And Substrate Effects, Stephen Emmanuel Mbuligwe
Optimization Of Treatment Of Chlorinated Volatile Organic Compound Mixtures In Constructed Wetlands: Vegetation And Substrate Effects, Stephen Emmanuel Mbuligwe
LSU Doctoral Dissertations
Microcosm and mesocosm scale experiments were carried out to investigate the effects of vegetation and substrates on the performance of engineered wetland systems (EWSs) meant to treat mixtures of volatile organic compounds (cVOCs). The experiments were conducted with a view to optimizing contributions of these wetland components. Phragmites communis and Typha latifolia, the commonest wetland plant species, were compared in mesocosm scale EWSs. Eight common wetland plant species were compared using microcosm experiments based on the potential of their rootmatter to enhance treatment of cVOC mixtures. Twelve common wetland plants were similarly compared but on the basis of their aboveground …
Fate And Transport Of Microorganisms In Coastal Subsurface-Experiment And Modeling, Haibo Cao
Fate And Transport Of Microorganisms In Coastal Subsurface-Experiment And Modeling, Haibo Cao
LSU Doctoral Dissertations
The objective of this dissertation was to investigate the fate and transport of microorganisms in coastal subsurface. Two topics were studied: (1) evaluation of the performance of the Marshland Upwelling System (MUS) in removing fecal bacteria and the background recovery after it is shut down; (2) Investigation of the effects of salinity and soluble organic matter (SOM) on sorption of MS-2 and development of a model to describe the sorption and transport process. The MUS showed effective performance in removing fecal bacteria during its 32 month operation period at Bayou Segnette Site. The removal efficiency was increased with its operation …
Stochastic Demand Forecast And Inventory Management Of A Seasonal Product A Supply Chain System, Mohammad Anwar Ashek Rahman
Stochastic Demand Forecast And Inventory Management Of A Seasonal Product A Supply Chain System, Mohammad Anwar Ashek Rahman
LSU Doctoral Dissertations
Estimation of seasonal demand prior to an active demand season is essential in supply chain management. The business cycle of the seasonal demand is divided into two stages: stage-1, the slow-demand period, and stage-2, the peak-demand period. The focus here is to determine an appropriate demand forecast for the peak-demand period. In the first set of forecasting model, a standard gamma and an inverse gamma prior distribution are used to forecast demand. The parameters of the prior model are estimated and updated based on current observation using Bayesian technique. The forecasts are derived for both complete and incomplete datasets. The …
Development Of An Ultrasonic Nde&T Tool For Yield Detection In Steel Structures, Yilmaz Bingol
Development Of An Ultrasonic Nde&T Tool For Yield Detection In Steel Structures, Yilmaz Bingol
LSU Doctoral Dissertations
Nondestructive Evaluation and Testing (NDE&T) is a commonly used and rapidly growing field that offers successful solutions for health assessment of structures. NDE&T methods have gained increasing attention in the last few decades especially with the contribution of the advancements in computer and instrumentation technologies. The applications of numerous NDE&T methods in civil engineering mostly focus on material characterization and defect detection. Techniques for nondestructively identifying the stress state in materials, on the other hand, mostly rely on the Theory of Acoustoelasticity. However, the sensitivity and the accuracy of acoustoelasticity are affected by several factors such as the microstructure of …
An Experimental Study On The Formation Of Polycyclic Aromatic Hydrocarbons During The Pyrolysis And Oxidation Of Catechol[Ortho-Dihydroxybenzene]-A Model Compound Representative Of Structural Units In Coal, Wood, And Biomass, Shiju Thomas
LSU Doctoral Dissertations
Polycyclic aromatic hydrocarbons (PAH) formed during the pyrolysis and combustion of solid fuels like coal, wood, and biomass are widespread environmental pollutants. Since some PAH are known to exhibit carcinogenic and mutagenic activity, understanding the chemical reactions responsible for PAH formation is of utmost importance. To better understand the reactions leading to the formation of PAH from complex solid fuels, pyrolysis and oxidation experiments have been performed in an isothermal laminar-flow reactor, using the model fuel catechol (ortho-dihydroxybenzene), a phenol-type compound representative of structural entities in coal, wood, and biomass. Catechol pyrolysis experiments have also been performed in the presence …
Current Transport Modeling Of Carbon Nanotube Field Effect Transistors For Analysis And Design Of Integrated Circuits, Jose Mauricio Marulanda Prado
Current Transport Modeling Of Carbon Nanotube Field Effect Transistors For Analysis And Design Of Integrated Circuits, Jose Mauricio Marulanda Prado
LSU Doctoral Dissertations
The purpose of this study was to develop a complete current transport model for carbon nanotube field effect transistors (CNT-FETs) applicable in the analysis and design of integrated circuits. The model was derived by investigating the electronic structure of carbon nanotubes and using basic laws of electrostatics describing a field effect transistor. We first derived analytical expressions for the carrier concentration in carbon nanotubes for different chiral vectors (n,m) by studying and characterizing their electronic structure. Results showed a strong relation to the diameter and wrapping angle of carbon nanotubes. The charge distribution in a CNT-FET is characterized from the …
Optimal Robust Fault Detection, Nike Liu
Optimal Robust Fault Detection, Nike Liu
LSU Doctoral Dissertations
This dissertation gives complete, analytic, and optimal solutions to several robust fault detection problems for both continuous and discrete linear systems that have been considered in the research community in the last twenty years. It is shown that several well-recognized robust fault detection problems, such as H_minus\H_2, H_2\ H_infinity and H_infinity\H_infinity problems, have a very simple optimal solution in an observer form by solving a standard algebraic Riccati equation. The optimal solutions to some other robust fault detection problems, such as H_minus\H_2 and H_2\H_2 problems are also given. In addition, it is shown that some well-studied and seeming sensible optimization …
Enhancing Security In Quantum Cryptography, Partha Basuchowdhuri
Enhancing Security In Quantum Cryptography, Partha Basuchowdhuri
LSU Master's Theses
Quantum Key Distribution was named as one of the top ten emerging technologies by Technology Review Journal in 2003 in their annual edition. The growth in quantum cryptography since the beginning of the millennium has been expedited by new theories and ideas. The introduction of practical quantum cryptosystems offered by USA based company MagiQTech and its European rival idQuantique has changed the face of cryptography. With active experimental research in USA, Europe, Japan and Singapore, the scope of quantum cryptography seems to be growing daily. When Bennett and Brassard proposed their BB84 protocol in Bangalore in 1984, no one would …
Factors Affecting Young Driver Safety In The State Of Louisiana, Cherian Cherian-Korah
Factors Affecting Young Driver Safety In The State Of Louisiana, Cherian Cherian-Korah
LSU Master's Theses
Though teenage drivers constitute only 6.4 percent of the total drivers in United States, they are responsible for 14 percent of the fatal crashes and are involved in 18 percent of all police-reported crashes in the country. One of the main causes of teenage crashes was found to be the presence of passengers in the vehicle. This study is focused on the effect of passengers on young drivers in the state of Louisiana. There have been efforts from traffic safety departments to contain crashes involving this age group of drivers and, particularly the Graduated Driver's License Law, which imposes restrictions …
Quantification Of Tars And Particulates From A Pilot Scale, Downdraft Biomass Gasifier, Christopher Osita Akudo
Quantification Of Tars And Particulates From A Pilot Scale, Downdraft Biomass Gasifier, Christopher Osita Akudo
LSU Master's Theses
Alternative energy production through biomass gasification produces combustible gases, such as carbon monoxide, hydrogen, and methane. These gases can be used for generation of direct heat, electricity, or liquid fuels through the Fischer Tropsch process. However, a major limitation of the overall process is the purity of the generated synthesis gas. The tars and particulates generated in the gasification process constitute a major impediment to the commercial use of this technology because they may condense on valves, fittings, and therefore, hinder the smooth running of an engine. This research was aimed at developing a gas characterization and testing protocol, and …
Assessing A Hydrothermal Liquefaction Process Using Biomass Feedstocks, Jason S. Midgett
Assessing A Hydrothermal Liquefaction Process Using Biomass Feedstocks, Jason S. Midgett
LSU Master's Theses
The need to reduce the United States dependence on foreign oil has never been greater. In the past decade emphasis has been placed on developing new and/or improved means to procure clean renewable energy. Liquefaction, which was developed for coal conversion over a century ago is one of these areas. Liquefaction used for biomass conversions to bio-oils is grouped under the thermochemical conversion (TCC) area of energy conversion methods along with gasification and pyrolysis. This thesis discusses liquefaction experiments conducted using varieties of Louisiana biomass feedstocks. Dairy manure collected from the Louisiana State University Dairy Farm in Baton Rouge, was …
Characterization Of Hma Mixtures Containing High Recycled Asphalt Pavement Content With Crumb Rubber Additives, Samuel B. Cooper, Jr.
Characterization Of Hma Mixtures Containing High Recycled Asphalt Pavement Content With Crumb Rubber Additives, Samuel B. Cooper, Jr.
LSU Master's Theses
As the price of petroleum and material costs escalate and pressures of maintaining the sustainability of our environment, owners must continually find methods to decrease material costs and maximize their benefits. One such method is to increase and/or begin using readily available recycled materials like reclaimed asphalt pavements (RAP) and crumb rubber (CR). The objective of this study was to fundamentally characterize the laboratory performance of conventional HMA mixtures and mixtures containing high RAP content and waste tire crumb rubber/additives through their fundamental engineering properties. A Superpave l9-mm nominal maximum aggregate size (NMAS) Level 2 HMA mixture meeting LADOTD specification …
The Effectiveness Of The Introduction And Amendment Of Traffic Laws On Louisiana Road Crashes, Vamshi Krishna Mudumba
The Effectiveness Of The Introduction And Amendment Of Traffic Laws On Louisiana Road Crashes, Vamshi Krishna Mudumba
LSU Master's Theses
Evaluating the safety benefit of a treatment provides information to the future safety projects of our transportation system. Various transportation laws have been amended in the state of Louisiana, aiming to reduce the roadway crash rates. The major traffic laws introduced or amended in the state in the past decade were the Graduated Driver Licensing (GDL) Program in 1998, repealing the mandatory motorcycle helmet law in 1999 and reenacting it in 2004, introducing the open alcohol container laws in 2000, and lowering the per se Blood Alcohol Content (BAC) from 0.10 to 0.08 percent in 2003. A before-and-after analysis was …
Nanoclay Reinforced Polymer Composite And Its Application To Hybrid Composite Structures, Gefu Ji
Nanoclay Reinforced Polymer Composite And Its Application To Hybrid Composite Structures, Gefu Ji
LSU Master's Theses
The purpose of this study was to find the optimum mixing technique that leads to maximum gain in mechanical, thermal, and fire-retardant properties of vinyl ester based nanocomposites. Specifically, five combinations of incremental mixing intensity were applied to five groups of samples that were made of vinyl ester resin reinforced by 1 wt. % of montmorillonite (MMT). Changes in mechanical properties associated with each mixing combination were examined through a variety of tests, which were low velocity impact test, bending test, compression test, and dynamic mechanical analysis (DMA). Additionally, changes in thermal properties (e.g., thermal diffusivity, glass transition temperature) and …
The Design And Fabrication Of Pentacene Acoustic Charge Transfer Devices, Hua Shao
The Design And Fabrication Of Pentacene Acoustic Charge Transfer Devices, Hua Shao
LSU Master's Theses
Acoustic charge transport (ACT) devices are used to transfer electrical signals by surface acoustic waves (SAW), which are generated by interdigital transducers (IDT) on piezoelectric crystal substrates. In order to reduce fabrication cost, pentacene ACT is desired to transfer charge packages because of its reduced cost in. As some researchers reported, pentacene is a p type organic semiconductor, and can get high carrier mobility by growing in very pure crystalline structure under some specified growing conditions. In this project, charge transfer channel was made of crystal pentacene to form and carry the charge packages following SAW propagation. The pentacene ACT …
Design And Testing Of An Infrared Temperature System To Test The Effects Of Chemical Stimulation On Heat Production In Cell Cultures, Nicholas Gerbo
Design And Testing Of An Infrared Temperature System To Test The Effects Of Chemical Stimulation On Heat Production In Cell Cultures, Nicholas Gerbo
LSU Master's Theses
Temperature is an important physiological parameter of cell biology. The thermal energy output of cells in vitro can offer insight into cellular processes. Standard methodology of measuring cellular thermal output has been through microcalorimetry. In this work, infrared thermography is presented as an alternative to microcalorimetry and other measurement techniques. An enclosure that controls the temperature of cells and allows for injection of temperature control of chemical agents and subsequent measurement of cell temperature using an infrared camera has been designed and tested. The enclosure was tested with 3T3-L1 adipocytes treated with the β3 adrenergic agonist CL 316-243 for up …
Design And Realization Of An Electrophoretron Cycler, Celine Raymonde Ramet
Design And Realization Of An Electrophoretron Cycler, Celine Raymonde Ramet
LSU Master's Theses
Polymerase Chain Reaction (PCR) is a powerful enzymatic reaction commonly used to amplify specific sequences of Deoxyribo Nucleic Acid (DNA). Since the introduction of the lab on a chip concept, numerous Continuous Flow PCR cyclers were realized with success at the micro scale. As reducing the reactor size and improving thermal management led to reduced sample volumes, results could be achieved much faster with these CF-PCR cyclers than with common commercial cycler. Furthermore, most of these demonstrated CF-PCRs are nowadays evolving towards high-throughput systems. However, most CF-PCR cyclers require complex manipulations and are not flexible (e.g. fixed number of cycles, …
Physical Modeling Of Flow And Sediment Transport Using Distorted Scale Modeling, Ryan L. Waldron
Physical Modeling Of Flow And Sediment Transport Using Distorted Scale Modeling, Ryan L. Waldron
LSU Master's Theses
As coastal Louisiana's land loss problem continues to grow unabated, many different solutions have been proposed. One such solution is the concept of diverting fresh water and sediment from the river into the coastal wetlands. Louisiana State University has a Small Scale Physical Model (SSPM) for the study of the potential of such diversions; it is deisgned to study the bulk movement of sediment in the river and diversions. The model is a distorted scale model with a horizontal scale of 1:12,000 and a vertical scale of 1:500; this extreme distortion has brought into question the applicability of the model. …
Airlift Assisted Wastewater Treatment, Brian Sidney Johnson
Airlift Assisted Wastewater Treatment, Brian Sidney Johnson
LSU Master's Theses
Static low density media (SLDM) filtration has been received with great admiration in the aquaculture industry and consequently spawned into the domestic wastewater setting on the pilot scale. This method of granular filtration uses plastic beads to facilitate the roles of both clarification and biofiltration into one compact unit. The fundamental operating principles utilized in this form of treatment can be greatly enhanced when they are coupled with self contained recirculation from airlift pumps. Recirculation of this type in a SLDM unit has the ability to provide multiple passes of the substrate in the wastewater through the bead bed to …
High Strain Rate Characteristics Of Rubber Modified Syntactic Foams, Paul Wehmer
High Strain Rate Characteristics Of Rubber Modified Syntactic Foams, Paul Wehmer
LSU Master's Theses
This thesis deals with the characterization of hybrid syntactic foams under high strain rates (HSR) ranging from 450/s to 1000/s. The foams studied are comprised of epoxy resin matrix filled with 63% volume fraction glass microspheres and 2% volume fraction of ground rubber fragments. The focus of this study is to compare the strength, ultimate strain, and modulus of these composite materials at high strain rates and quasi-static conditions and to find out the effects of HSR on the failure mode and fracture behavior of these materials. Split Hopkinson Pressure Bar (SHPB) apparatus is used for the HSR testing. Foams …
Pilot-Scale Study On Anaerobic Digestion Applied To A Saline Industrial Waste Activated Sludge, Changjiang Shen
Pilot-Scale Study On Anaerobic Digestion Applied To A Saline Industrial Waste Activated Sludge, Changjiang Shen
LSU Master's Theses
In the field of municipal wastewater treatment, anaerobic digestion is a well-established, effective process for stabilization of organic sludge with the attractive features of low operating costs and production of methane as a useful by-product. Application of anaerobic digestion for the treatment of saline industrial wastewater sludge, however, has not been well established. The studies described in this thesis were conducted with the overall goal of assessing the feasibility of mesophilic anaerobic digestion processes for treatment of waste activated sludge (WAS) containing moderate salinity (approximately 3% m/v). Experiments employed two 30-gallon conical-bottom HDPE reactors. In the first phase of testing, …
Experimental And Numerical Investigation Of Fluid Flow And Heat Transfer In Microchannels, Wynn Allen Phillips
Experimental And Numerical Investigation Of Fluid Flow And Heat Transfer In Microchannels, Wynn Allen Phillips
LSU Master's Theses
Microchannels are of current interest for use in heat exchangers where very high heat transfer performance is desired. Microchannels provide very high heat transfer coefficients because of their small hydraulic diameters. In this study, an investigation of fluid flow and heat transfer in microchannels is conducted. A review of the literature published regarding fluid flow and heat transfer in microchannels is provided in this study. A thorough background on the theory of internal convective heat transfer is provided as well. A critical analysis of some of the published heat transfer experiments on microchannels is also given. It was found that …
Three-Echelon Supply Chain Delivery Policy With Trade Credit Consideration, Farhana Rahman
Three-Echelon Supply Chain Delivery Policy With Trade Credit Consideration, Farhana Rahman
LSU Master's Theses
In recent years, collaboration in supply chain approach widely discussed in the literature; but most have dealt with the two-echelon systems. This study focuses on the just-in-time delivery policy of three-echelon supply chain by collaborative approach, where any of the information from the supply chain is available to all the subsystems involved; manufacturer, distribution center and retailer. In the first part of the study a simple model has been developed for a three-echelon supply system that consists of a single manufacturer, a single distribution center and a single retailer. The other part of the study extends this model by considering …