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Articles 391 - 420 of 1307
Full-Text Articles in Engineering
Application Of Computational Fluid Dynamics To Near-Wellbore Modeling Of A Gas Well, Oscar Mauricio Molina
Application Of Computational Fluid Dynamics To Near-Wellbore Modeling Of A Gas Well, Oscar Mauricio Molina
LSU Master's Theses
Well completion plays a key role in the economically viable production of hydrocarbons from a reservoir. Therefore, it is of high importance for the production engineer to have as many tools available that aid in the successful design of a proper completion scheme, depending on the type of formation rock, reservoir fluid properties and forecasting of production rates. Because well completion jobs are expensive, most of the completed wells are usually expected to produce as much hydrocarbon and as fast as possible, in order to shorten the time of return of the investment. This research study focused on the evaluation …
Micro-Encapsulation Of Asphalt Rejuvenators Using Melamine-Formaldehyde, Max Abelardo Aguirre Deras
Micro-Encapsulation Of Asphalt Rejuvenators Using Melamine-Formaldehyde, Max Abelardo Aguirre Deras
LSU Master's Theses
Self-healing microencapsulation in asphalt concrete is an emerging technology that would allow this particular material to resist cracking damage caused by vehicular and environmental loading. The objectives of this study were to evaluate the effect of an asphalt rejuvenator on asphalt binder in reversing the aging process and to develop a synthesis procedure for the production of microencapsulation of asphalt rejuvenators. Production parameters such as agitation rate, heating temperature and EMA concentration were varied to determine the effect on microcapsules properties such as size, shell thickness and morphology. Based on the results of the experimental program, it was concluded that …
Near Total Resonant Light Absorption In A Graphene Monolayer At Multiple Tunable Wavelengths With Multilayer Structures, Iman Zand
LSU Master's Theses
Graphene could be potentially important for a broad range of photonic and optoelectronic applications. For such graphene-based applications it is critical to enhance the absorption of light in graphene monolayers in order to achieve near total absorption. Several structures have been proposed to enhance light absorption in graphene at visible and infrared wavelengths such as one-dimensional Fabry-Perot cavity structures, and photonic crystal slabs. Fabry-Perot cavity structures, which employ periodic Bragg mirrors, can lead to near total light absorption on resonance. However, such structures cannot achieve near complete absorption in graphene at multiple closely-spaced tunable wavelengths, which is potentially important for …
Stochastic Modeling Of Semantic Structures Of Online Movie Reviews, Limeng Pu
Stochastic Modeling Of Semantic Structures Of Online Movie Reviews, Limeng Pu
LSU Master's Theses
Facing the enormous volumes of data available nowadays, we try to extract useful information from the data by properly modeling and characterizing the data. In this thesis, we focus on one particular type of semantic data --- online movie reviews, which can be found on all major movie websites. Our objective is mining movie review data to seek quantifiable patterns between reviews on the same movie, or reviews from the same reviewer. A novel approach is presented in this thesis to achieve this goal. The key idea is converting a movie review text into a list of tuples, where each …
Driver Response And Safety Effect Of Three-Foot Bicycle Passing Laws, Nelida Andreina Herrera
Driver Response And Safety Effect Of Three-Foot Bicycle Passing Laws, Nelida Andreina Herrera
LSU Master's Theses
The long and tragic history of vehicle-bicycle crashes in the United States has increasingly led to calls for legislative action to provide greater protections for bicyclists on the nation’s roadways. Among the most common of these actions are the three-foot passing laws. Recent history suggests that these laws may contribute to reducing the number of vehicular/bicycle-related collisions as well as their accompanying deaths and injuries, but few, if any, studies have shown how they substantively affect driver behavior. This thesis builds upon the results of recent research quantifying the effects of the three-foot passing laws by comparing key behavioral aspects …
An Exploration Of Plasmonics For Nanoparticle-Based Gene Delivery, Corey Raymond Landry
An Exploration Of Plasmonics For Nanoparticle-Based Gene Delivery, Corey Raymond Landry
LSU Master's Theses
The spatiotemporal control of biological processes, especially cell growth and differentiation, remains one of the most compelling challenges in basic and clinical biomedical research. Fields as diverse as cancer therapy and regenerative medicine rely on spatial and temporal control of biochemical cues to achieve desired biological objectives. MicroRNA are attractive for highly-localized delivery applications because their instability in the cell restricts their biological effect to a small target area. These short, non-coding strands can be easily synthesized and modified for attachment and release from nanoparticle delivery vehicles. The research interest around microRNA therapies has produced a wide array of pathways …
Biofuel Production From Chinese Tallow Tree Seeds Using Microwave Technology, Mohamad Barekati Goudarzi
Biofuel Production From Chinese Tallow Tree Seeds Using Microwave Technology, Mohamad Barekati Goudarzi
LSU Master's Theses
In-situ transesterification (simultaneous extraction and transesterification) of Chinese tallow tree seeds into methyl esters using two microwave systems were investigated in this study. In the first part, utilizing a batch system, parameters tested were catalyst concentration (1-4 wt.%), solvent ratio (2-6 v/w), reaction time (15-60 min) and temperature (50-70°C). A high degree of oil extraction and efficient conversion of oil to biodiesel were found in the proposed range. The process was further optimized in terms of product yields and conversion rates using Dohlert optimization methodology. Based on the experimental results and statistical analysis, the optimal production yield conditions for this …
A Distributed Diffusion-Driven Algorithm For Load Balancing In An Electrical Power Grid, Isaac Abhilash Ayyala
A Distributed Diffusion-Driven Algorithm For Load Balancing In An Electrical Power Grid, Isaac Abhilash Ayyala
LSU Master's Theses
In this thesis we propose a distributed algorithm, based on diffusion, to balance loads on an electrical power grid, while maintaining stable operation (system’s ability to maintain bus voltages within preset bounds). This algorithm, called the Diffusion-driven Distributed Load Balancing (DDLB) algorithm, is implemented on the OMNET++ Discrete Event Simulator and the response of the physical grid is simulated on a load flow program, which together simulate a deployment of the DDLB algorithm on the grid. The electrical grid is represented as a graph whose nodes are buses and whose edges are power lines connecting buses. Each node (except the …
Multiscale Modeling Of Particle Transport In Petroleum Reservoirs, Layne Bryan French
Multiscale Modeling Of Particle Transport In Petroleum Reservoirs, Layne Bryan French
LSU Master's Theses
Modeling subsurface particle transport and retention is important for many processes, including sand production, fines migration, and nanoparticle injection. In this study, a pore-scale particle plugging simulator is concurrently coupled with a streamline reservoir simulator to predict the behavior of particles in the subsurface. The coupled simulators march forward in time together. The automated communication between the two models enables the prediction of spatially and time dependent parameters that control the particle transport process. At each time step, the reservoir simulator provides the inlet velocity and particle concentration of the fluid suspension to the pore-scale model which outputs the permeability, …
Effect Of Appointment Schedules On The Operational Performance Of A University Medical Clinic, Arunn Pisharody Vijayan
Effect Of Appointment Schedules On The Operational Performance Of A University Medical Clinic, Arunn Pisharody Vijayan
LSU Master's Theses
Healthcare costs in the United States are one of the highest in the world. The healthcare expenditure alone accounted for 17.9% of the Gross Domestic Product of US in 2011. The National Healthcare Expenditure (NHE) is expected to increase at an annual rate of 6.6% from $ 2.6 Trillion in 2010 to $ 4.5 Trillion in 2019. The per capita expenditure for hospital outpatients and physicians has been the highest among other hospital expenses. This escalation in expenses created a need for productivity improvements in the healthcare industry to control costs. Some of the common problems encountered in outpatient clinics …
Impact Of Algae On Sugar Mill Effluents: Water Treatment And Added Value Assessment, Jacob Stephen Foy
Impact Of Algae On Sugar Mill Effluents: Water Treatment And Added Value Assessment, Jacob Stephen Foy
LSU Master's Theses
Installations similar to Louisiana sugar mills have been proposed as potential biorefineries for sugarcane, energy cane, and sweet sorghum. The nutrient-rich wastewater generated from the milling process can be used as an algal growth medium. Simultaneously, algae can serve as a water treatment strategy to deplete these effluents of excess nitrogen, phosphorus, and organic carbon. In this research the effluents of a sugar mill were characterized for water quality and nutrient characteristics; the effluents were determined to be suitable for growth of a native Louisiana co-culture of microalgae and cyanobacteria (Chlorella vulgaris/Leptolyngbya sp.); growth rate, biomass productivity and nutrient uptake …
Exploration Of Segmented Flow In Microchannels Using The Volume Of Fluid Method In Ansys Fluent, Jace Michael Boudreaux
Exploration Of Segmented Flow In Microchannels Using The Volume Of Fluid Method In Ansys Fluent, Jace Michael Boudreaux
LSU Master's Theses
Segmented flow can be utilized in lab-on-a-chip technologies to speed up chemical and biological analysis. Segmented flow (also known as Taylor flow or the Bretherton problem) has often been explored in circular channels, but rectangular channels are more common for microfluidics applications. To this end, pressure-driven droplet flow in a square microchannel is studied using the volume of fluid method in ANSYS Fluent, a computational fluid dynamics program. It was found that for low Reynolds number (Ret = 0.01) and droplet sizes larger than the channel diameter, the flow is mostly influenced by capillary number and viscosity ratio. The …
Experimental Study Of A Cascade Of Low Pressure Turbine Blades With Upstream Periodic Stator Wakes, Carlos Rene Gonzalez Rodriguez
Experimental Study Of A Cascade Of Low Pressure Turbine Blades With Upstream Periodic Stator Wakes, Carlos Rene Gonzalez Rodriguez
LSU Master's Theses
The objective of this study is to experimentally study film cooling flows. A closed-loop wind tunnel with a four passage linear cascade of US Air Force Research Laboratory (AFRL) ultra-high-lift L1A low pressure turbine (LPT) blades and upstream wake generator is used in conjunction with Particle Image Velocimetry (PIV) flow visualization technique to study turbulent film cooling flows due to the interaction between vanes and blades. Further post-processing in the form of Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) modal analyses is performed to determine the relevant modes that characterize the coherent structures in the flow. An image …
Design And Implementation Of A Passive Neurostimulator With Wireless Resonance-Coupled Power Delivery And Demonstration On Frog Sciatic Nerve And Gastrocnemius Muscle, Jose Aquiles Parodi Amaya
Design And Implementation Of A Passive Neurostimulator With Wireless Resonance-Coupled Power Delivery And Demonstration On Frog Sciatic Nerve And Gastrocnemius Muscle, Jose Aquiles Parodi Amaya
LSU Master's Theses
The thesis presented has four goals: to perform a comprehensive literature review on current neurostimulator technology; to outline the current issues with the state-of-the-art; to provide a neurostimulator design that solves these issues, and to characterize the design and demonstrate its neurostimulation features. The literature review describes the physiology of a neuron, and then proceeds to outline neural interfaces and neurostimulators. The neurostimulator design process is then outlined and current requirements in the field are described. The novel neurostimulator circuit that implements a solution that has wireless capability, passive control, and small size is outlined and characterized. The circuit is …
Vibration Control In High-Rise Buildings For Multi-Hazard, Srinivasa Adithya Sailesh Abburu
Vibration Control In High-Rise Buildings For Multi-Hazard, Srinivasa Adithya Sailesh Abburu
LSU Master's Theses
Increasing population and migration of people to cities has led to the construction of high-rise buildings. High-rise buildings have received a renewed interest in many city business locations, where land is scarce, as per their economic, sustainability and other benefits. Taller and taller towers are being built everywhere in the world. However, the increased frequency of multi-hazard disasters makes it challenging to balance between a resilient and sustainable construction. As a saying, ‘with new inventions come new problems’. High-rise buildings usually have issues with increased wind loads brought by, for instance, hurricanes, which can decrease their serviceability and cause failure …
Recent Advances And Additives Of Bone Cement And Bone Augments For Arthroplastic Surgeries, Nicholas Patrick Totaro
Recent Advances And Additives Of Bone Cement And Bone Augments For Arthroplastic Surgeries, Nicholas Patrick Totaro
LSU Master's Theses
ABSTRACT As life expectancies rise and the average age of our population increases, there has emerged a growing need for joint repair and replacement surgeries due to worn out, torn, or damaged cartilage and bone tissue. This has resulted in an escalating demand for further development of the materials used in joint replacement surgeries and advances in joint repair technology. Researchers in the tissue engineering and regenerative medicine fields have furthered the development of advanced materials for musculoskeletal repair by utilizing growth factors, nanomaterials, and antibiotics within the repair material. The first aim of this thesis was to provide a …
Antioxidant Activity Of Lutein Entrapped In Poly (Dl-Lactide Co-Glycolide) Acid And Plga/Chitosan Nanoparticles, Toni Borel Lousteau
Antioxidant Activity Of Lutein Entrapped In Poly (Dl-Lactide Co-Glycolide) Acid And Plga/Chitosan Nanoparticles, Toni Borel Lousteau
LSU Master's Theses
Polymeric nanocarriers improve cellular uptake, stability, solubility, and functionality of entrapped drugs and nutraceuticals. The hypothesis of this study was that entrapping lutein, a hydrophobic antioxidant, in different polymeric nanoparticles (NPs) will improve its stability and antioxidant activity. The following objectives were proposed: 1. Synthesize and characterize polymeric nanoparticles of poly lactic co-glycolic acid (PLGA) and PLGA NPs covered with a layer of chitosan (PLGA/Chi) from a physicochemical perspective, and 2. Assess functionality of the entrapped lutein as a function of type of polymer in which entrapped. Nanoparticles were synthesized by emulsion evaporation method. Characterization included size, zeta potential, and …
Modelling Of Channelization In Unconsolidated Formations Due To Liquid Injection, Juan Felipe Bautista Barake
Modelling Of Channelization In Unconsolidated Formations Due To Liquid Injection, Juan Felipe Bautista Barake
LSU Master's Theses
Fluid injection has been increasingly implemented in oil and gas producing fields to optimize hydrocarbon production in both young and mature oil fields across the globe. This situation arises from the realization that early planning of second and tertiary recovery methods may improve project economics significantly. Injectors are then intended to perform at high injection rates with low bottomhole flowing pressures for as long as possible. In the case of injectors drilled in unconsolidated formations, deficient performance often times seems to be the norm. With a majority of these fields being offshore developments in which capital expenditures are high, a …
Radiation Heat Transfer In A Particulate Medium Using A Ray Tracing Method, Manish B. Patil
Radiation Heat Transfer In A Particulate Medium Using A Ray Tracing Method, Manish B. Patil
LSU Master's Theses
In the present work, a complete 3D simulation of ray tracing model is developed for studying the radiation heat transfer, associated with laser based additive manufacturing, in both thick and thin particulate beds by using the Monte Carlo method. Additional program is developed for creating different types of packing structures such as simple cubic, rhombohydral and random packing. The scattering mechanisms in the particulate beds for large opaque spheres are evaluated using the specular and diffuse reflection methods. Further, a novel approach has been added to the model to include isotropic, forward and backward scattering mechanisms for a medium which …
Life Cycle Analysis Of An Airlifted Recirculation Aqualculture Facility, Marlon Alberetos Greensword
Life Cycle Analysis Of An Airlifted Recirculation Aqualculture Facility, Marlon Alberetos Greensword
LSU Master's Theses
Airlift-equipped recirculating aquaculture systems (RAS) provide water-circulation, aeration, and degassing efficiently and reliably. This project investigated the need for biofilters in a fish hatchery environment to address biofouling of tank water from hatching eggs. Eggs of various fish species were selected and Biological Oxygen Demand (BOD), total Kjeldahl nitrogen (TKN), and protein loading and content were measured and compared. Means for all samples were: 0.67±0.05g BOD₅/g, 10.89 nitrogen±0.84% and the mean protein content 69.22±3.82%. A statistical analysis indicates that Rachycentron canadum (cobia) and Ictalurus punctatus (channel catfish) is the most representative of the multi-species lot when compared to Balantiocheilus melanopterus …
Development Of A Three-Dimensional Bioprinter With Inline Light Activation For Bone Tissue Engineering, Colton Alexander Mcelheny
Development Of A Three-Dimensional Bioprinter With Inline Light Activation For Bone Tissue Engineering, Colton Alexander Mcelheny
LSU Master's Theses
Bioprinting offers exciting possibilities for tissue engineering related to tissue and organ failure due to trauma, disease, or aging. This is of substantial societal value as the world populace mean age rises. Current needs for tissue and organ repair far exceed availability. A strategy being explored to counter this imbalance is the single step fabrication of cellular constructs. This paper explores various bioprinting techniques and suggests a custom design for a cost-effective, low-maintenance bioprinting platform for academic research. The platform functionality was validated via two-dimensional image transfer and simple three-dimensional geometries.
A Comparative Analysis Of Roundabouts And Traffic Signals Through A Corridor, Melissa Arrigo Lebas
A Comparative Analysis Of Roundabouts And Traffic Signals Through A Corridor, Melissa Arrigo Lebas
LSU Master's Theses
This thesis presents a case study on an urban arterial corridor consisting of four intersections located in Baton Rouge, Louisiana. The research evaluates alternative roundabout designs in order to improve traffic flow through a currently congested corridor. The objectives of the research were to evaluate the effect of roundabouts in an urban arterial corridor, select the best alternative for the given corridor characteristics, and test the capacity of the alternative roundabout corridors. The three alternatives that were considered as part of this study were the existing signalized corridor, a partial two-lane roundabout corridor, and a partial three-lane roundabout corridor. Field …
Composite 1-Dimensional Modeling Of The Expanded Small Scale Mississippi River Model, Benjamin Joseph Hartman
Composite 1-Dimensional Modeling Of The Expanded Small Scale Mississippi River Model, Benjamin Joseph Hartman
LSU Master's Theses
Stream wise 1-dimensional numerical modelling couples well with long term, large domain physical modelling because of its ability to perform simulations quickly. The downsides are limitations in replicating some complex hydrodynamics and sediment transport behavior. In this study, a 1-dimensional model of a section of the Expanded Small Scale Physical Model (ESSPM) is developed using the USACE HEC-RAS software with a goal of investigating the ability of a 1-dimensional model to accurately replicate hydraulics at ESSPM time scales. Additional simulations are conducted to examine the impact of varying distortion scales, non-frictional energy losses and synthetic sediment on hydraulic behavior. The …
Automated Conversion Of Text Instructions To Human Motion Animation, Ravikumar Vishwanath Chimmalgi
Automated Conversion Of Text Instructions To Human Motion Animation, Ravikumar Vishwanath Chimmalgi
LSU Master's Theses
Text to animation is the conversion of textual instructions to animations following and depicting those instructions. Text to animation is important to fields such as crime scene investigation, military special operations and storytelling where text is utilized. It is also useful for physical therapy where a doctor can factor in disability parameters in the 3D models and determine the safest therapy exercises for patients. It can be used in robotics, where robot assistants can be instructed to perform tasks through text instructions. In this research, a system was created to generate 3D animation of workouts from their textual instructions. An …
Computer Simulation Of Modern Recirculation Systems And Their Production Strategies, Daniel Alt
Computer Simulation Of Modern Recirculation Systems And Their Production Strategies, Daniel Alt
LSU Master's Theses
Aquaculture has grown to meet the gap created by a growing demand from population growth and a stagnating wild catch. Recirculating aquaculture system (RAS) is a facet of aquaculture developed to allow the culture of fish in closed systems. The fish are able to survive as the various water parameters are kept within safe ranges by engineered systems and rules of operation. Engineers and operators have attempted to improve the efficiencies of these systems to increase their production. These improvements must guarantee the stability of the system for the entire culture cycle of the fish being raised in an RAS. …
A Comparative Assessment Of Ergonomic Risk Factors In University Personnel Using Rula And Reba Aiming To Study The Cause And Effect Relationship, Nabila Chowdhury
A Comparative Assessment Of Ergonomic Risk Factors In University Personnel Using Rula And Reba Aiming To Study The Cause And Effect Relationship, Nabila Chowdhury
LSU Master's Theses
The aim of this research was to conduct an ergonomic assessment of working postures and the design of computer workstations of the employees in Louisiana State University. The purpose of the study was threefold- (1) to determine the major ergonomic issues in university employees while working on computer workstations, (2) to compare the two ergonomic assessment tools (RULA and REBA) to see how similarly or differently they assess the risks present in the same working condition and (3) to develop a model that correlates between working condition, work posture and computer workstation design with their effects on musculoskeletal system. This …
Exploration Of The Shrp 2 Naturalistic Driving Study: Development Of A Distracted Driving Prediction Model, Syndney Jenkins
Exploration Of The Shrp 2 Naturalistic Driving Study: Development Of A Distracted Driving Prediction Model, Syndney Jenkins
LSU Master's Theses
The SHRP 2 NDS project was the largest naturalistic driving study ever conducted. The data obtained from the study was released to the researching public in 2014 through the project’s InSight webpage. The objectives of this research were to first explore the massive dataset and determine if it was possible to develop prediction models based on several performance measures that could be used to study driver distraction. Time series data on driver GPS speed, lateral and longitudinal acceleration, throttle position and yaw rate were discovered as five appropriate performance measures available from the NDS that could be used for the …
Sinking Of Crude Oil Amended-Model Oil Mixtures Due To Evaporative Or Dissolution Weathering On The Surface And Submerged In Water, Cameron Joseph Loebig
Sinking Of Crude Oil Amended-Model Oil Mixtures Due To Evaporative Or Dissolution Weathering On The Surface And Submerged In Water, Cameron Joseph Loebig
LSU Master's Theses
Despite the popular belief that crude oil is a mixture of hydrocarbons that floats on the surface of water, tar balls continue to wash up on beaches from the sea floor years after the Deep Water Horizon oil spill. This is because of the rarely studied weathering effects that occur during deep sea spills. While the evaporative weathering process of oil at the water’s surface has been studied, no currently implemented models assess the weathering effects of dissolution within the water column. The evaporative effects at the sea surface and the dissolution of soluble components within droplets located in the …
Saccharomyces Cerevisiae Tel1 & Tel2 Role In Dna Double-Strand Break Repairs, Tommy Nhan Trieu
Saccharomyces Cerevisiae Tel1 & Tel2 Role In Dna Double-Strand Break Repairs, Tommy Nhan Trieu
LSU Master's Theses
Genomic DNA is constantly in danger of being damaged by endogenous cellular processes and exogenous agents. Eukaryotes have mechanisms, collectively termed the DNA damage response, that detect and repair DNA damage. After a double-stranded break occurs, protein complexes are recruited to the break site to promote resection. Two main protein kinases involved in DNA repair are the Tel1 and Mec1 proteins. Recent studies have found that the Tel2 protein binds to both the Tel1 and Mec1 proteins and a point mutation of TEL2 on the 129th amino acid disrupts this interaction. Since both of the Tel1 and Mec1 proteins are …
A Model-Based Framework To Control The Crystal Size Distribution, Navid Ghadipasha
A Model-Based Framework To Control The Crystal Size Distribution, Navid Ghadipasha
LSU Master's Theses
Crystallization is an old unit operation in the industry which is widely used as a separation process due to its ability to produce highly valued chemical with high purity. Despite the long history of batch crystallization, industry still relies on rule of- thumb techniques for their crystallization processes. Thus, any method to improve the products characteristics such as size and morphology will be highly valued. Advances in robustness and accuracy of automated in situ sensors give the possibility to move towards an engineering based approach by implementing the real-time monitoring and control of the process. The research undertaken here investigates …