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Articles 841 - 870 of 1307
Full-Text Articles in Engineering
In-Situ And Nondestructive Test Methods Applied To The Design And Construction Of Pile Foundation Projects In Coastal Louisiana, Jesse Gerard Rauser
In-Situ And Nondestructive Test Methods Applied To The Design And Construction Of Pile Foundation Projects In Coastal Louisiana, Jesse Gerard Rauser
LSU Master's Theses
Construction projects in coastal Louisiana often require pile foundations as a result of the soft soils present, which complicate cast‐in‐place foundation construction and provide minimal support to shallow foundations. During a driven pile project, the engineering phase will require soil characterization and pile capacity determination, while construction will require quality assurance. These three elements, soil characterization, capacity determination, and quality assurance, are commonly accomplished using in‐situ and nondestructive testing. In this thesis, the application of some of these in‐situ and nondestructive methodologies to a project in Coastal Louisiana are examined. The Louisiana Transportation Research Center (LTRC) has released computer software …
Impact Damage Between The Collision Of A Vessel And Protective Fender Systems, Paul Joseph Kocke
Impact Damage Between The Collision Of A Vessel And Protective Fender Systems, Paul Joseph Kocke
LSU Master's Theses
Vessel collision with bridge pilings can cause a catastrophic event and are occurring at an alarming rate. Such events can lead to the collapse of a bridge, causing deaths, shutting down a primary route of transportation and costing millions of dollars in repairs. Today, the AASHTO Bridge Code gives designers a methodology toward designing bridge pilings to withstand the impact of an errant vessel. However, bridges designed before this code was written require a protective system that is capable of redirecting a colliding vessel without causing severe damage to the pilings or the vessel. This research will look into three …
Modeling The Relationship Among Occupational Stress, Psychological/Physical Symptoms And Injuries In The Construction Industry, Omosefe Osarieme Abbe
Modeling The Relationship Among Occupational Stress, Psychological/Physical Symptoms And Injuries In The Construction Industry, Omosefe Osarieme Abbe
LSU Master's Theses
The construction industry has one of the highest incidents of fatal and non-fatal accidents/injuries every year. As a high risk industry, there is a need to investigate factors that affect the occurrence of these accidents to be able to protect workers. Traditional approaches to workers’ safety in the construction industry have focused on the physical and biomechanical aspects of work by improving tools, equipment and task completion methods. However, the impact of psychosocial factors, specifically stress as experienced by construction workers is an area of growing research. Research in the area of occupational stress in the Construction Industry is yielding …
Nanoclay Syntactic Foam Composites, Sameer Leo Peter
Nanoclay Syntactic Foam Composites, Sameer Leo Peter
LSU Master's Theses
Syntactic foams are composite materials in which the matrix phase is reinforced with hollow particles called microballoons. They possess low moisture absorption, low thermal conductivity and high damage tolerance because of their compositions. Traditionally, syntactic foams are used in many high strength applications such as in aerospace and marine industries, thus there is a need to achieve both high compressive strength and high fracture strain with minimal increase in density. This research studies the effect of nanoclay on the high strain rate mechanical properties of syntactic foams. Nanoclay reinforced syntactic foams are fabricated by adding 1, 2 and 5% volume …
Design, Fabrication, And Testing Of A Micro Fuel Injection Swirler For Lean Premixed Combustion In Gas Turbine Engines, Anthony Louis Giglio
Design, Fabrication, And Testing Of A Micro Fuel Injection Swirler For Lean Premixed Combustion In Gas Turbine Engines, Anthony Louis Giglio
LSU Master's Theses
Due to growing energy demands and the need for increased fuel consumption efficiency, environmental protection agencies are imposing more stringent emissions regulations on gas turbine combustion systems with emphasis on NOx emissions reduction. Emerging technological combustion schemes to reduce NOx commonly employ lean premixed combustion. Decreases in NOx are globally obtained by flame temperature decrease and locally improved by homogeneity of the reacting mixture. A new micro fuel injection swirler, capable of providing efficient and rapid mixing over a short distance, is presented in this thesis. The conception of the Micro Fuel Injection Swirler (MFIS) was motivated by the need …
Freezing Processes In Cell Suspensions Evaluated Using Cryomicroscopy, Tathagata Acharya
Freezing Processes In Cell Suspensions Evaluated Using Cryomicroscopy, Tathagata Acharya
LSU Master's Theses
This thesis aims at evaluating the freezing response of three different cell types, Pacific Oyster embryos, Jurkats and Helas, using the technique of cryomicroscopy. The choice of cells was primarily based on supporting ongoing research work at the Bioengineering Laboratory, Department of Mechanical Engineering at Louisiana State University in Baton Rouge. On a secondary basis, the cells were chosen based on their contrasting nature. While Pacific Oyster being a favorite food in USA calls for successful techniques of cryopreservation of their embryos in order to keep up with the growing demand, Jurkat and HeLa are undesired malignant human cells that …
Model-Based Framework For Alloy Electrodeposition Processes, Miguel Eduardo Estrada
Model-Based Framework For Alloy Electrodeposition Processes, Miguel Eduardo Estrada
LSU Master's Theses
The electrodeposition of iron-group alloys has been widely studied due to their interest as materials used for their magnetic and thermo-physical properties. Models such as ternary NiCoFe and quaternary NiCoFeCu multilayer alloys have been previously developed to simulate mass transfer and reaction kinetics. The reactions involved in the models contain kinetic parameters such as rate constants and inverse Tafel slopes which are estimated using trial and error techniques. The previous models are limited to a set of kinetic parameters for each change in concentrations of the electrolyte. Although deposition behaviors such as anomalous codeposition are captured, functionalities to use the …
Evaluation Of Sweep Efficiency Of A Mature Co2 Flood In Little Creek Field, Mississippi, Didem Senocak
Evaluation Of Sweep Efficiency Of A Mature Co2 Flood In Little Creek Field, Mississippi, Didem Senocak
LSU Master's Theses
CO2 displacement is the most widely used EOR process, but poor sweep efficiency and large CO2 utilization rates are limitations to the economic and technical success of CO2 floods. Developing a methodology to maximize the sweep efficiency and minimize the CO2 utilization rate would greatly improve the economics of these fields. This thesis evaluates the sweep efficiency of a successful, late-in-life, continuous injection CO2 flood at the Little Creek Field, Mississippi. In this work, we evaluate several heterogeneity measures in terms of recovery efficiency and utilization rate. Core studies available from 41% of the wells in the field were used …
Experimental Study Of A Foam Flow In Horizontal Pipes: Two Flow Regimes And Its Implications, Miodrag Bogdanovic
Experimental Study Of A Foam Flow In Horizontal Pipes: Two Flow Regimes And Its Implications, Miodrag Bogdanovic
LSU Master's Theses
Although foam has been widely used in many scientific and engineering applications, the current understanding of foam rheology in pipes is still very limited because of its complex nature. This experimental study, for the first time, investigates the flow rheology of foams in pipes by placing a special emphasis on two distinct foam flow regimes. A wide range of experimental conditions are examined in this study, which include five different surfactant formulations (Cedepal FA-406, Petrostep CG-50, Stepanform 1050, Aquet TD-600, and Ultra-Palmolive), three different surfactant concentrations (0.1, 1, and 5 wt %), two different pipe diameters (0.5 and 1 inch …
Characterization And Development Of Axle Load Spectra To Enhance Pavement Design And Performance On The Basis Of New Mechanistic-Empirical Design Guide In Louisiana, Bharath Kumar Sridhar
Characterization And Development Of Axle Load Spectra To Enhance Pavement Design And Performance On The Basis Of New Mechanistic-Empirical Design Guide In Louisiana, Bharath Kumar Sridhar
LSU Master's Theses
For pavement design practices, several factors must be considered to ensure good performance of the pavement over the anticipated life cycle. Such factors include, but are not limited to, the type of paving materials, traffic loading characteristics, prevailing environmental conditions, and others. Traditional pavement design practices have followed the standards set by the American Society of State Highway and Transportation Officials (AASHTO) which require the use of an equivalent single axle load (ESAL - 18 kip single axle load) for design traffic input. Recently, a new mechanistic-empirical pavement design guide (MEPDG) was developed to improve pavement design practices. The guide …
Sulphur Removal Using Regenerable Sorbents Of Rare Earth/Transition Metal Oxides, Vikram Reddy Kalakota
Sulphur Removal Using Regenerable Sorbents Of Rare Earth/Transition Metal Oxides, Vikram Reddy Kalakota
LSU Master's Theses
Hot gas desulfurization of gases from primary gasifier can be accomplished using sorbents composed Zn, calcium and transition metal oxide sorbents. The problem with metal oxide sorbents alone is that they are easily reduced at high temperature above 873 K to metallic state under reducing atmosphere decreasing their desulfurization capacity. Sorbents studied for hot gas desulfurization were based on Ce/La/M (M = transition metal) oxides and Ce/La/RE (RE = a rare earth) oxide. Sorbents were prepared using sol-gel method and the rare earth oxides were doped with transition metals using incipient wetness impregnation. Sulfidation experiments were carried out at 873 …
Quasi-Static And Impact Characterization Of Sandwich Structures With An Iso-Grid Stiffened Syntactic Foam Core, Venkata Sandeep Chakka
Quasi-Static And Impact Characterization Of Sandwich Structures With An Iso-Grid Stiffened Syntactic Foam Core, Venkata Sandeep Chakka
LSU Master's Theses
In this study, a novel hybrid sandwich structure with an integrated, iso-grid stiffened syntactic foam core was fabricated and evaluated by impact test and static test. Sandwich beams with different grid cell areas were prepared using a pin-guided dry weaving process. Low velocity impact test on different locations (rib, node, and bay) was conducted with varying hammer weight and impact velocities by an instrumented impact testing machine. Ultrasonic C-scan was utilized before and after impact to identify the damage induced by impact. Scanning Electron Microscopy observation was also implemented to visualize the impact damage at micro- length scale. Compressions after …
Fog-Smog Reactor And Photooxidation Of Naphthalene Within The Fog Condensate In A Uv Light Setup, Neha Shrikant Damle
Fog-Smog Reactor And Photooxidation Of Naphthalene Within The Fog Condensate In A Uv Light Setup, Neha Shrikant Damle
LSU Master's Theses
Polycyclic aromatic hydrocarbons (PAHs) form a major class of air pollutants. Naphthalene is a commonly found PAH in the atmosphere. Atmospheric fog water contains naphthalene absorbed from surrounding air. The partition coefficient of naphthalene is defined as the ratio of total naphthalene concentration in fog water to total naphthalene concentration in air. The purpose of this research was to determine the partition coefficients of naphthalene for varying reactor temperature. Fog was artificially formed in a predesigned reactor. NaCl aerosols were used as condensation nuclei for fog formation. Fog droplets were exposed to naphthalene vapors in the reactor. The reactor provided …
Modeling Of Solute Transport And Retention In Upper Amite River, Hoonshin Jung
Modeling Of Solute Transport And Retention In Upper Amite River, Hoonshin Jung
LSU Master's Theses
Streams play an important role in a solute transport through a stream network. Transient storage is one of the important processes that control mass exchange between a main stream and transient storage zones because of increase in the residence time of solute. In order to take account of the effect of transient storage on solute transport in streams, a variable residence time (VART) model was developed. The model is characterized by several features: (1) actual varying residence time was used, (2) no-user specified residence time distributions (RTD) were required, (3) less calibration parameters were involved as compared to existing models, …
Exploring Stochastic Characteristics Of Freeway Traffic Breakdown And Recovery Conditions, Chaitanya Mamidala
Exploring Stochastic Characteristics Of Freeway Traffic Breakdown And Recovery Conditions, Chaitanya Mamidala
LSU Master's Theses
In recent times, the term ‘congestion’ has gained a lot of attention due to its negative impact on the mobility and efficiency of transportation network. Congestion control and mitigation of its effects has become a prime concern to many transportation agencies. With breakthroughs in transportation technologies, effective management and utilization of existing infrastructure capacities has been possible. One of the key functions of technological advancements is the ability to understand the different characteristics of traffic that prevail on major freeways and arterials, and to model short-term predictions of traffic conditions with reasonable accuracy. Providing accurate, real-time information makes travelers aware …
Parametric Study Of A Pulsed Vertical Jet In Cross-Flow, Guillaume Francois Bidan
Parametric Study Of A Pulsed Vertical Jet In Cross-Flow, Guillaume Francois Bidan
LSU Master's Theses
The potential of pulsed vertical jet in cross-flow for film cooling purposes was experimentally studied and is discussed in this Thesis. A single vertical jet placed in laminar cross-flow conditions was first characterized in steady state at relatively low blowing ratios ranging from 0.150 to 0.600, using Mie scattering visualization methods and hot-wire measurements. Wavelet spectral analysis and image quantification algorithms were applied to the velocity records and averaged visualizations to obtain quantitative data on the jet characteristic frequencies, penetration and coverage. Two different regimes characterized by different structures are identified and adapted scaling variables are provided. Trends in the …
Fabrication Of Micro Bumps For Micro Scale Thermal Management, Ajay Ashok Kardak
Fabrication Of Micro Bumps For Micro Scale Thermal Management, Ajay Ashok Kardak
LSU Master's Theses
Cryopreservation is storage of biological systems at ultra low temperatures for a prolonged duration; such that they can be thawed and restored to the same living state. It is important to understand the behavior of cells when they are subjected to subzero temperatures. Research in this area has shown the occurrence of two main biophysical events; cellular dehydration and intracellular ice formation. Current techniques for characterizing the dehydration in cells as part of a tissue are not adequate for studying intracellular ice formation in tissues. An integrated device consisting of an array of thermal sensors (microthermocouples) and actuators (microthermoelectric coolers) …
Effect Of Hydrated Lime On The Laboratory Performance Of Superpave Mixtures, Md Sharear Kabir
Effect Of Hydrated Lime On The Laboratory Performance Of Superpave Mixtures, Md Sharear Kabir
LSU Master's Theses
Permanent deformation and moisture damage are the most common distresses found in asphalt pavements today. Extensive experimental studies have revealed that the use of hydrated lime in Hot-Mix Asphalt (HMA) mixtures can reduce permanent deformation, long-term aging, and moisture susceptibility of mixtures. In addition, it increases the stiffness and fatigue resistance of mixtures. The objectives of this study were to evaluate (1) the fundamental engineering properties of HMA mixtures containing hydrated lime compared to conventional mixtures designed to meet the current Louisiana Superpave specifications and (2) the influence of the method of addition of hydrated lime on the mechanical properties …
Physical Layer Secrecy Channel Coding, Bandali K. Akkawi
Physical Layer Secrecy Channel Coding, Bandali K. Akkawi
LSU Master's Theses
Wireless communications is expanding and becoming an indispensable part of our daily life. However, due to its channel open nature, it is more vulnerable to attacks, such as eavesdropping and jamming which jeopardize the confidentiality of wireless data, compared to its counter-part, wireline communications. Security in wireless communication is thus a very important factor that should be perfected to accommodate the rapid growth of wireless communication today. Motivated by information theoretic secrecy definitions, we adopt a simple way to define the secrecy of a system by looking at its Bit-Error-Rate (BER) curves, the correlation of error vectors and Log Likelihood …
Development Of An Algorithm For Switching Compensator Control Based On The Currents' Physical Components Theory, Samuel Pearce
Development Of An Algorithm For Switching Compensator Control Based On The Currents' Physical Components Theory, Samuel Pearce
LSU Master's Theses
Development of a three-phase switching compensator algorithm, based on the Currents’ Physical Components (CPC) power theory and capable of performing in real time, is the subject of this thesis. The compensator algorithm could be implemented to control a PWM Inverter, which would perform as a shunt switching compensator of harmonic, reactive and unbalanced currents or a customizable combination of the three. The hardware used to demonstrate the ability of the algorithm to perform within the restraints or real time operation is a Motorola DSP56F807 evaluation mode DSP board and a set of voltage and current sensors. The Evaluation Board was …
Experimental Investigation Of Unsaturated Soil Stiffness, Ananth Bukkapatnam Tirumala
Experimental Investigation Of Unsaturated Soil Stiffness, Ananth Bukkapatnam Tirumala
LSU Master's Theses
Soil stiffness is a strain dependent non-linear parameter. Stiffness is the measure of soil deformation under a particular working load. It can used for predicting ground deformation in engineering earthworks such as highway embankments and foundations. Non-linear analyses for ground behavior have been widely used for developing models to predict the small –strain characteristics of the soil (Atkinson, 2000). This thesis provides a new insight into the behavior of soil stiffness. We used the wave propagation technique to determine the stiffness and term it as the small strain shear modulus (Gmax) of the soil. The objective of the thesis was …
Nonlocal Gradient-Dependent Modeling Of Plasticity With Anisotropic Hardening, Gerald Pekmezi
Nonlocal Gradient-Dependent Modeling Of Plasticity With Anisotropic Hardening, Gerald Pekmezi
LSU Master's Theses
This work is concerned with the formulation of the thermodynamics of nonlocal plasticity using the gradient theory. The formulation is based on the nonlocality energy residual introduced by Eringen and Edelen (1972). Gradients are introduced for those variables associated with isotropic and kinematic hardening. The formulation applies to small strain gradient plasticity and makes use of the evanescent memory model for kinematic hardening. This is accomplished using the kinematic flux evolution as developed by Zbib and Aifantis (1987). Therefore, the present theory is a four nonlocal parameter-based theory that accounts for the influence of large variations in the plastic strain, …
Voltage Dip Mitigation For Motor Starters Using An Adaptive High Speed Relay Protection On The High Voltage Transmission System, Cesar Alberto Rincon
Voltage Dip Mitigation For Motor Starters Using An Adaptive High Speed Relay Protection On The High Voltage Transmission System, Cesar Alberto Rincon
LSU Master's Theses
Currently, the aging state of the protection systems for industrial facilities is calling for a system-wide review of the equipment and the protection schemes used in all these places, calling for a new approach in the design and implementation of these systems. Some of these facilities house critical processes that can be seriously affected by a misoperation of equipment or a disturbance in the system, aspects ranging from safety of plant workers to millions of dollars in loss of production. In this thesis different contingency situations were explored for problems in the utility transmission system that could affect large industrial …
Photocatalytic Oxidation Of Ethanol Using Macroporous Titania, Gibert Merle Magpantay
Photocatalytic Oxidation Of Ethanol Using Macroporous Titania, Gibert Merle Magpantay
LSU Master's Theses
Photocatalytic oxidation (PCO) using TiO2 is a potential means of remediating poor indoor air quality that is attributed to low levels of volatile organic compounds (VOC). In this work, ethanol is chosen as a simple compound representative of VOC’s. The aim of this research is to establish a baseline for the photocatalytic activity of TiO2 in ethanol PCO as well as the photonic efficiency of the photoreactor. The PCO conversion could then be enhanced by using photocatalyst having a macroporous structure. A flat plate photoreactor, UV light delivery and a flow system was designed in this work to accomplish ethanol …
Application Of The Hyman Model To Evaluate The Water And Salt Budgets In Three Mangrove Sites Along Shark River, Everglades, Cheng-Feng Tsai
Application Of The Hyman Model To Evaluate The Water And Salt Budgets In Three Mangrove Sites Along Shark River, Everglades, Cheng-Feng Tsai
LSU Master's Theses
Mangrove trees play an important role in the maintenance and sustainability of coastal wetlands due to their ability to adapt and survive in a wide range of saline and tidal conditions. Hydrologic processes (e.g., inundation frequency) and salinity are important regulators controlling the growth and productivity of mangrove forests. To quantify how changes in landscape-level hydrology will influence these regulators in mangrove forests, the hydrology model (HYMAN) was applied to three sites with distinct tidal forcings along the Shark River estuary in the Everglades National Park. HYMAN model uses mass balance equation to determine daily water and salt budgets as …
Magnetic Field Effects On Diffusion Flames, Diego F. Gonzalez
Magnetic Field Effects On Diffusion Flames, Diego F. Gonzalez
LSU Master's Theses
Magnetic field effects in combustion is an area of study that has previously been overlooked. The influence of magnetic fields on flames has only recently been explored and is of interest both from a scientific and a practical standpoint. This study provides theoretical, numerical and experimental evidence that combustion can be affected with the use of suitable magnetic fields. This thesis focuses on four different types of magnetic field: homogeneous, gradient, oscillating and pre-combustion. For the homogeneous field case, the Gibbs Free Energy method was used to determine the mole fraction of product species. It was found that homogeneous fields …
Composite Sandwich Structure With Grid Stiffened Core, Venkata Dinesh Muthyala
Composite Sandwich Structure With Grid Stiffened Core, Venkata Dinesh Muthyala
LSU Master's Theses
Composite sandwich structures have been widely used in aerospace structures, ship building, infrastructure, etc. due to their light weight and high strength to weight ratio. Traditionally, light-weight core materials such as foam core, truss core, honeycomb core have been used in fabricating sandwich structures with limited success. In this study, a new composite sandwich structure with a hybrid core was proposed, fabricated, tested, and modeled. The hybrid core consists of a fiber reinforced polymer grid skeleton that is filled in by extremely light-weight syntactic foam in the bay areas. The new sandwich structure was manufactured using a new manufacturing process. …
Performance Analysis Of Intel Core 2 Duo Processor, Tribuvan Kumar Prakash
Performance Analysis Of Intel Core 2 Duo Processor, Tribuvan Kumar Prakash
LSU Master's Theses
With the emergence of thread level parallelism as a more efficient method of improving processor performance, Chip Multiprocessor (CMP) technology is being more widely used in developing processor architectures. Also, the widening gap between CPU and memory speed has evoked the interest of researchers to understand performance of memory hierarchical architectures. As part of this research, performance characteristic studies were carried out on the Intel Core 2 Duo, a dual core power efficient processor, using a variety of new generation benchmarks. This study provides a detailed analysis of the memory hierarchy performance and the performance scalability between single and dual …
Influence Of Temperature On The Performance Of Wetlands Treating Chlorinated Volatile Organic Compounds, Maria G. Murillo
Influence Of Temperature On The Performance Of Wetlands Treating Chlorinated Volatile Organic Compounds, Maria G. Murillo
LSU Master's Theses
Various studies have presented models to predict the performance of constructed wetlands at different temperatures focused on the removal of conventional pollutants, and common configuration of constructed wetlands. Investigations on the effect of temperature on the performance of constructed wetlands treating chlorinated volatile organic compounds are limited to microcosm studies. This study is meant to come up with kinetic and energy balance input data for mathematical models that can be used to predict the performance of upflow constructed treatment wetlands treating chlorinated ethenes and ethanes at different ambient temperatures. Bench scale continuous upflow columns will be conducted to investigate the …
Hydrodynamic Modeling Of A Hypothetical River Diversion Near Empire, Louisiana, Nathan Lamont Dill
Hydrodynamic Modeling Of A Hypothetical River Diversion Near Empire, Louisiana, Nathan Lamont Dill
LSU Master's Theses
Hydrodynamic models of a hypothetical Mississippi river diversion near Empire, LA are constructed using two popular finite element codes RMA2 and ADCIRC. In a series of simulations eddy viscosity parameters and bottom friction parameters are varied. Constant boundary conditions, discharge inflow and elevation outflow, are applied and water surface elevation and velocity solutions at fully developed flow are taken as steady-state results. A particle tracking code is developed and applied to the velocity solutions to aid in flow field comparisons. The results elucidate the model sensitivities to the varied parameters, and also provide for a comparison of the two different …