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2015

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Articles 6181 - 6210 of 7524

Full-Text Articles in Engineering

A Distributed Diffusion-Driven Algorithm For Load Balancing In An Electrical Power Grid, Isaac Abhilash Ayyala Jan 2015

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 …

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Multiscale Modeling Of Particle Transport In Petroleum Reservoirs, Layne Bryan French Jan 2015

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, …

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Impact Of Algae On Sugar Mill Effluents: Water Treatment And Added Value Assessment, Jacob Stephen Foy Jan 2015

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 …

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Experimental Study Of A Cascade Of Low Pressure Turbine Blades With Upstream Periodic Stator Wakes, Carlos Rene Gonzalez Rodriguez Jan 2015

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 …

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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 Jan 2015

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 …

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Vibration Control In High-Rise Buildings For Multi-Hazard, Srinivasa Adithya Sailesh Abburu Jan 2015

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 …

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Recent Advances And Additives Of Bone Cement And Bone Augments For Arthroplastic Surgeries, Nicholas Patrick Totaro Jan 2015

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 …

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Antioxidant Activity Of Lutein Entrapped In Poly (Dl-Lactide Co-Glycolide) Acid And Plga/Chitosan Nanoparticles, Toni Borel Lousteau Jan 2015

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 …

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Modelling Of Channelization In Unconsolidated Formations Due To Liquid Injection, Juan Felipe Bautista Barake Jan 2015

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 …

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Radiation Heat Transfer In A Particulate Medium Using A Ray Tracing Method, Manish B. Patil Jan 2015

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 …

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Life Cycle Analysis Of An Airlifted Recirculation Aqualculture Facility, Marlon Alberetos Greensword Jan 2015

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 …

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Development Of A Three-Dimensional Bioprinter With Inline Light Activation For Bone Tissue Engineering, Colton Alexander Mcelheny Jan 2015

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.

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A Comparative Analysis Of Roundabouts And Traffic Signals Through A Corridor, Melissa Arrigo Lebas Jan 2015

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 …

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Composite 1-Dimensional Modeling Of The Expanded Small Scale Mississippi River Model, Benjamin Joseph Hartman Jan 2015

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 …

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Automated Conversion Of Text Instructions To Human Motion Animation, Ravikumar Vishwanath Chimmalgi Jan 2015

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 …

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Computer Simulation Of Modern Recirculation Systems And Their Production Strategies, Daniel Alt Jan 2015

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. …

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A Comparative Assessment Of Ergonomic Risk Factors In University Personnel Using Rula And Reba Aiming To Study The Cause And Effect Relationship, Nabila Chowdhury Jan 2015

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 …

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Exploration Of The Shrp 2 Naturalistic Driving Study: Development Of A Distracted Driving Prediction Model, Syndney Jenkins Jan 2015

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 …

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Sinking Of Crude Oil Amended-Model Oil Mixtures Due To Evaporative Or Dissolution Weathering On The Surface And Submerged In Water, Cameron Joseph Loebig Jan 2015

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 …

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Saccharomyces Cerevisiae Tel1 & Tel2 Role In Dna Double-Strand Break Repairs, Tommy Nhan Trieu Jan 2015

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 …

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A Model-Based Framework To Control The Crystal Size Distribution, Navid Ghadipasha Jan 2015

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 …

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Natural Fiber Derived Activated Carbons For Industrial Emission Minimization And Capture, Melike Dizbay Onat Jan 2015

Natural Fiber Derived Activated Carbons For Industrial Emission Minimization And Capture, Melike Dizbay Onat

All ETDs from UAB

Natural fibers including hemp, sisal, flax and industrial natural fiber waste that are con-sidered as "green" alternative sources to prepare low cost, high quality activated carbon comprise this study. Natural fibers were carbonized and subjected to chemical activation to convert them to activated carbon materials. Adsorption isotherm plots, pore size char-acteristics and the Brunauer, Emmet and Teller (BET) surface areas of natural fiber de-rived activated carbons were determined to understand the physical adsorption proper-ties. Chemical structures were determined by ultimate and proximate analyses. Porosity was visualized through SEM images. FTIR analysis was used to indicate the main func-tional groups of …

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Morphology Of Brain Sulci Trabeculae And Its Effect On Brain During Impacts, Sharlin Anwar Jan 2015

Morphology Of Brain Sulci Trabeculae And Its Effect On Brain During Impacts, Sharlin Anwar

Dissertations and Theses

Traumatic brain injury (TBI) is an intracranial injury caused by direct contact or non-contact head impacts to the brain. TBI is a major problem that accounts for high incidents of hospitalizations each year. Thus, it is important to understand and predict the occurrence of TBI in an impact. It has been shown that the subarachnoid space (SAS) trabeculae play an important role in damping the effect of an impact, thus reducing the injuries. However, the influence of sulci parameters and the sulci trabeculae in TBI due to impact is unexplored. Studies have shown that inclusion of sulci in brain models …

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Laboratory Experimental Demonstration Of The Effect Of Oceanic Whitecaps In The Transport Of Oil And Dispersant Components To The Atmosphere, Paria Avij Jan 2015

Laboratory Experimental Demonstration Of The Effect Of Oceanic Whitecaps In The Transport Of Oil And Dispersant Components To The Atmosphere, Paria Avij

LSU Doctoral Dissertations

During the DWH oil spill, vast quantities of crude oil were released into the sea-surface environment of the Gulf of Mexico. There has been ample research focused on the transport of oil into the different environmental sections. Evaporation has been considered to be the only transport pathway of oil spill matter into the atmosphere. However, the aerosolization of oil and dispersant via bursting bubbles as they occur in whitecaps and breaking waves has not been considered in the oil and dispersant budget calculation. This transport vector is significant as it is the dominant source of particulate matter production in the …

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On The Role Of Surface Roughness In Elastohydrodynamic Lubrication Of Tribological Components, Mohammad Masjedi Jan 2015

On The Role Of Surface Roughness In Elastohydrodynamic Lubrication Of Tribological Components, Mohammad Masjedi

LSU Doctoral Dissertations

The present dissertation investigates the effect of surface roughness in the elastohydrodynamic lubrication (EHL). Since many essential components of the machinery such as gears, rolling element bearings, cam-followers, and heavily loaded journal bearings operate under the mixed EHL condition, and given the fact that nearly all engineering surfaces are rough to some extent, there is a need for an extensive research which can realistically quantify the effect of the surface roughness in such applications. We thus seek to develop an applied engineering approach for the treatment of the mixed EHL for prediction of the performance of machinery. Both line-contact and …

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Nusat I Participant Photographs, Robert J. Twiggs Jan 2015

Nusat I Participant Photographs, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs of the participants involved with the NUSat I program from January 3, 2013.

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Transcranial Near Infrared Spectroscopy And Stimulation Of Prefrontal Cognitive Functions In Young Adults, Snehal Niwrutti Hase Jan 2015

Transcranial Near Infrared Spectroscopy And Stimulation Of Prefrontal Cognitive Functions In Young Adults, Snehal Niwrutti Hase

Bioengineering Theses - Archive

Transcranial near infrared stimulation or Low Level Laser Therapy (LLLT) is an innovative technique shown to control neuronal function in cell cultures, animal models and clinical conditions. The aim of this study was to use near infrared spectroscopy (NIRS) to evaluate the physiological and functional effects of LLLT on prefrontal cognitive functions in young healthy adults. This study was divided into two parts: the first part investigated the physiological effects of LLLT and the second investigated the functional effects.The aim of the first part of this study was to explore how a single session of LLLT altered the hemodynamic status …

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Measurement Of Cerebral Blood Flow Using Arterial Spin Labeling Method Across Lifespan, Ciwen Wang Jan 2015

Measurement Of Cerebral Blood Flow Using Arterial Spin Labeling Method Across Lifespan, Ciwen Wang

Bioengineering Theses - Archive

Arterial Spin Labeling (ASL) is one family of perfusion-weighted contrast imaging techniques of Magnetic Resonance Imaging (MRI) that measures cerebral blood flow by labeling spins in arterial blood with inversion and then waiting for a certain period of time for the labeled arterial blood to enter the imaging plane, and then acquiring MR image at the image plane. In compare with PET, ASL is a noninvasive new technology. But as a new technology, it is not very commonly used because of the relatively low signal to noise ratio, less robust mechanism, and more important, there is no standard for clinical …

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Cubesat Remote Data & Comms Transponders 145.825 Mhz, Bob Bruninga, Mirek Kasal, Mike Ruprecht Jan 2015

Cubesat Remote Data & Comms Transponders 145.825 Mhz, Bob Bruninga, Mirek Kasal, Mike Ruprecht

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Bob Bruninga, Mirek Kasal, and Mike Ruprecht titled "Cubesat Remote Data & Comms Transponders 145.825 MHz" from October 16, 2015.

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Test 2130: John Deere 8345r, Nebraska Tractor Test Lab Jan 2015

Test 2130: John Deere 8345r, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

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