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Articles 1231 - 1260 of 2820
Full-Text Articles in Engineering
Bridge Rating Based On In-Situ Weigh-In-Motion And Health Monitoring Data, Dana Feng
Bridge Rating Based On In-Situ Weigh-In-Motion And Health Monitoring Data, Dana Feng
LSU Doctoral Dissertations
Parallel to the bridge design methodology changes from the Allowable Stress Design to the Load Factor Design, and then to the reliability based Load and Resistance Factor Design (LRFD), bridge load rating method has also been evolving. Applying the reliability theory to the bridge load rating is more complex than applying to the LRFD since any conservatism can have a significant effect on the assessment of bridge capacity, particularly in load posting and bridge replacement. Although the current Load and Resistant Factor Rating (LRFR) method applying the concept of reliability analyses, it uses very limited site-specific data due to practical …
Molecular Simulation Studies Of Hydrophobins Near Gas, Oil And Water Interfaces, Yuwu Chen
Molecular Simulation Studies Of Hydrophobins Near Gas, Oil And Water Interfaces, Yuwu Chen
LSU Doctoral Dissertations
This dissertation contains fundamental, classical molecular simulation studies of the properties of hydrophobins (a unique family of surface-active proteins produced by filamentous fungi in soil) near interfaces involving gas, oil, water, organic solvents and polymers. These studies are relevant to possibly using hydrophobins as natural oil dispersants and in processing of polymers. Preliminary studies by the Russo group suggest that these small surface-active proteins can encapsulate oil, gases and polymers in cylindrical structures. We have performed classic molecular dynamics (MD) simulation and potential of mean force (PMF) calculations of a class I hydrophobin EAS using both all-atom and coarse-grained representations. …
Simulation Studies For Relative Importance Of Unconventional Reservoir Subgrid Scale Physics Parameters, Yaakoub Youssef El Khamra
Simulation Studies For Relative Importance Of Unconventional Reservoir Subgrid Scale Physics Parameters, Yaakoub Youssef El Khamra
LSU Doctoral Dissertations
In this endeavor we attempt to better understand gas transport in shale gas reservoirs, specifically the impact and effects of different physical phenomena. We start by documenting the nature of the reservoirs and the need for accurate modeling of various physical phenomena in multiple interconnected continua. The physical phenomena of interest include non-linear Forchheimer flow, Knudsen diffusion in the form of slip "Klinkenberg" flow and adsorption/desorption. The numerical methods used in the reservoir simulator are also introduced, along with a derivation of the main equations used. Various verification and validation results are compared against manufactured and analytical solutions and finally …
Development Of A Biosensor System To Detect Bacteria In Food Systems, Luis Alonso Alfaro Sanabria
Development Of A Biosensor System To Detect Bacteria In Food Systems, Luis Alonso Alfaro Sanabria
LSU Doctoral Dissertations
The development of biosensors may assist for the on-site detection of foodborne pathogens. The overall goal of this study was to develop a biosensor system for detecting Listeria innocua (non-pathogenic surrogate bacteria used as a model for pathogenic Listeria monocytogenes) in food systems. The study was divided into three main parts: (1) development of a sample collection and interface system for Listeria innocua from food samples, (2) development of a sample concentration system for the collected bacteria prior detection, and (3) development of a detection system based on a carbon nanotube potentiometric biosensor for a quantitative detection of Listeria innocua. …
Growth Of Polycyclic Aromatic Hydrocarbons During The Supercritical Pyrolysis Of N-Decane, Subramanian Venkateswaran Kalpathy
Growth Of Polycyclic Aromatic Hydrocarbons During The Supercritical Pyrolysis Of N-Decane, Subramanian Venkateswaran Kalpathy
LSU Doctoral Dissertations
In order to serve a dual role as a propellant and as a coolant, fuels in the pre-combustion environment of future high-speed aircraft will be exposed to temperatures and pressures of up to 700 °C and 130 atm—conditions that are supercritical for jet fuels. Under such conditions, fuel can undergo pyrolytic reactions leading to the formation of polycyclic aromatic hydrocarbons (PAH), which are precursors to fuel-line solid deposits that can hinder safe operation of the aircraft. Therefore, to prevent solid deposit formation, it is extremely important to understand the PAH formation pathways in the supercritical fuel pyrolysis environment. To better …
Conjunctive Management Of Water Resources Under Climate Change Projection Uncertainty, Amir Mani
Conjunctive Management Of Water Resources Under Climate Change Projection Uncertainty, Amir Mani
LSU Doctoral Dissertations
Goal of this study is to investigate the impacts of climate change projection uncertainty on conjunctive use of water resources. To pursue this goal first, a conjunctive-use model is developed for management of groundwater and surface water resources via mixed integer linear fractional programming (MILFP). The conjunctive management model maximizes the ratio of groundwater usage to reservoir water usage. A conditional head constraint is imposed to maintain groundwater sustainability. A transformation approach is introduced to transform the conditional head constraint into a set of mixed integer linear constraints in terms of groundwater head. A supply network is proposed to apply …
Statistical Reservoir Characterization, Simulation, And Optimization Of Field Scale-Gas Assisted Gravity Drainage (Gagd) Process With Uncertainty Assessments, Watheq Jasim Mohammed Al-Mudhafar
Statistical Reservoir Characterization, Simulation, And Optimization Of Field Scale-Gas Assisted Gravity Drainage (Gagd) Process With Uncertainty Assessments, Watheq Jasim Mohammed Al-Mudhafar
LSU Doctoral Dissertations
Unlike the Continuous Gas Injection (CGI) and Water-Alternative Gas (WAG), the Gas Assisted Gravity Drainage (GAGD) process takes advantage of the natural segregation of reservoir fluids to provide gravity-stable oil displacement. The gas is injected through existing vertical wells to formulate a gas cap to allow oil and water drain down to the horizontal producer (s). Therefore, the GAGD process was implemented through immiscible and miscible injection modes to improve oil recovery in a sector of the main pay/upper sandstone member in the South Rumaila oil field, located in Iraq. A high-resolution geostatistical reservoir characterization model was constructed to model …
Increasing Off-Chip Bandwidth And Mitigating Dark Silicon Via Switchable Pins, Shaoming Chen
Increasing Off-Chip Bandwidth And Mitigating Dark Silicon Via Switchable Pins, Shaoming Chen
LSU Doctoral Dissertations
Off-chip memory bandwidth has been considered as one of the major limiting factors to processor performance, especially for multi-cores and many-cores. Conventional processor design allocates a large portion of off-chip pins to deliver power, leaving a small number of pins for processor signal communication. We observed that the processor requires much less power than that can be supplied during memory intensive stages in some cases. In this work, we propose a dynamic pin switch technique to alleviate the bandwidth limitation issue. The technique is introduced to dynamically exploit the surplus pins for power delivery in the memory intensive phases and …
Effective 3d Geometric Matching For Data Restoration And Its Forensic Application, Kang Zhang
Effective 3d Geometric Matching For Data Restoration And Its Forensic Application, Kang Zhang
LSU Doctoral Dissertations
3D geometric matching is the technique to detect the similar patterns among multiple objects. It is an important and fundamental problem and can facilitate many tasks in computer graphics and vision, including shape comparison and retrieval, data fusion, scene understanding and object recognition, and data restoration. For example, 3D scans of an object from different angles are matched and stitched together to form the complete geometry. In medical image analysis, the motion of deforming organs is modeled and predicted by matching a series of CT images. This problem is challenging and remains unsolved, especially when the similar patterns are 1) …
Analysis Of Disruptions In The Gulf Of Mexico Oil And Gas Industry Supply Chain And Related Economic Impacts, Negar Dahitaleghani
Analysis Of Disruptions In The Gulf Of Mexico Oil And Gas Industry Supply Chain And Related Economic Impacts, Negar Dahitaleghani
LSU Doctoral Dissertations
Catastrophic events are human and economic tragedies in collaboration. Oil spills have enormous impacts on the local economy of the area and for the local labor markets. The Deepwater Horizon oil spill was caused by an explosion on semisubmersible drilling rig (Macondo) on April 20, 2010. Another regional disaster, Hurricane Katrina as it ripped over the core of the Gulf of Mexico producing zone, one of the most important oil and gas production region. With Geological complexities, continued of drilling and production in GoM increases the risk of having leak/spill. Therefore, the Econometrics methods, and Modeling to forecast impacts of …
Scheduling And Tuning Kernels For High-Performance On Heterogeneous Processor Systems, Ye Fang
Scheduling And Tuning Kernels For High-Performance On Heterogeneous Processor Systems, Ye Fang
LSU Doctoral Dissertations
Accelerated parallel computing techniques using devices such as GPUs and Xeon Phis (along with CPUs) have proposed promising solutions of extending the cutting edge of high-performance computer systems. A significant performance improvement can be achieved when suitable workloads are handled by the accelerator. Traditional CPUs can handle those workloads not well suited for accelerators. Combination of multiple types of processors in a single computer system is referred to as a heterogeneous system. This dissertation addresses tuning and scheduling issues in heterogeneous systems. The first section presents work on tuning scientific workloads on three different types of processors: multi-core CPU, Xeon …
A Frequency Hopping Method To Detect Replay Attacks, Guofu Tang
A Frequency Hopping Method To Detect Replay Attacks, Guofu Tang
LSU Master's Theses
The application of information technology in network control systems introduces the potential threats to the future industrial control system. The malicious attacks undermine the security of network control system, which could cause a huge economic loss. This thesis studies a particular cyber attack called the replay attack, which is motivated by the Stuxnet worm allegedly used against the nuclear facilities in Iran. For replay attack, this thesis injects the narrow-band signal into control signal and adopts the spectrum estimation approach to test the estimation residue. In order to protect the information of the injected signal from knowing by attackers, the …
Expandable Proppants For Hydraulic Fracturing, Livio Yang Santos
Expandable Proppants For Hydraulic Fracturing, Livio Yang Santos
LSU Master's Theses
Hydraulic fracturing is recognized as the primary technique to achieve economic oil and gas production from low permeability reservoirs like shale and tight-sand formations. One of the main challenges facing the oil and gas industry is maintaining the proppant functionality in the subsurface where replacement of proppant is only possible by expensive refracturing operations. Proppant crushing and proppant embedment have posed challenges for sustainable production from stimulated wells especially in soft and deep formations like Haynesville Shales. Experimental measurements show the strong impact of proppant stress and proppant embedment on reducing fracture conductivity. In this work, we introduce a new …
Enhancing Program Soft Error Resilience Through Algorithmic Approaches, Sui Chen
Enhancing Program Soft Error Resilience Through Algorithmic Approaches, Sui Chen
LSU Master's Theses
The rising count and shrinking feature size of transistors within modern computers is making them increasingly vulnerable to various types of soft faults. This problem is especially acute in high-performance computing (HPC) systems used for scientific computing, because these systems include many thousands of compute cores and nodes, all of which may be utilized in a single large-scale run. The increasing vulnerability of HPC applications to errors induced by soft faults is motivating extensive work on techniques to make these applications more resilient to such faults, ranging from generic techniques such as replication or checkpoint/restart to algorithm-specific error detection and …
Real And Reactive Power Control Of Induction Motor Drives, Juan Rafael Nunez
Real And Reactive Power Control Of Induction Motor Drives, Juan Rafael Nunez
LSU Master's Theses
Induction motors are considered the workhorse in the majority of industrial applications. Their rugged, low-maintenance, and efficient designs keep finding new forms of use nowadays. In this work, power control strategies of induction motor drives based on principles of Direct Torque Control and Model Predictive Control are investigated. The proposed methods control the real and reactive power flow into/out of the machine by selecting and applying proper voltage space phasors to the stator. First, the impact of voltage space phasors on real and reactive power variations is explored. Based on these observations, two methods to choose the appropriate voltage space …
Effects Of Temperature Segregation On The Denisity And Mechanical Properties Of Asphalt Mixtures, Pranjal Pravin Phaltane
Effects Of Temperature Segregation On The Denisity And Mechanical Properties Of Asphalt Mixtures, Pranjal Pravin Phaltane
LSU Master's Theses
Temperature differentials (TD) between the target laydown and actual laydown temperatures of asphalt paving mixtures have been noticed and measured since the late 1990s. Since then, numerous research studies conducted on the phenomena found inconclusive conclusions regarding the effects of TD on the initial pavement quality and the long-term performance. The objective of this study was to evaluate the effects of different levels of TD on the initial quality and the long-term performance of asphalt pavements by evaluating the core density and laboratory measured performance characteristics, respectively. Through the evaluation, it was also aimed to ascertain and establish allowable TD …
Hydrodynamic Modeling Of Newly Emergent Coastal Deltaic Floodplains, Alexandra Christensen
Hydrodynamic Modeling Of Newly Emergent Coastal Deltaic Floodplains, Alexandra Christensen
LSU Master's Theses
Coastal deltaic floodplains provide an important ecosystem service by removing or retaining nitrate from enriched riverine water. Wetland plants, soils, and microbes within these floodplains use nitrate through uptake, burial, and denitrification, thereby reducing the impact of nitrate on algal blooms and hypoxia in the Gulf of Mexico. However, these processes depend on the physical, biological, and chemical conditions within the floodplain. Understanding and characterizing the hydrodynamics of these systems and the relative impact of river, tide, and wind forcings are the first steps in understanding the biogeochemical processes controlling nitrate removal. Motivated by the desire to identify biogeochemical hotspots …
Development Of Microfluidic Devices To Study Algal Chemotaxis And Long-Term Growth Dynamics, Benjamin Seth Roberts
Development Of Microfluidic Devices To Study Algal Chemotaxis And Long-Term Growth Dynamics, Benjamin Seth Roberts
LSU Master's Theses
Harmful algal blooms pose a threat to human health and the environment. Many complex factors influence their formation and development, and much is still unknown. One major influencing factor that is well-known yet poorly studied is algal chemotaxis. Many studies have examined chemotaxis in other organisms, but very little about chemotaxis in algae has been studied, largely because existing technology and assay techniques are inadequate. Microfluidics offers many possibilities for cell biology, and has been applied to the study of chemotaxis in other organisms already. These techniques can be applied to the study of algal chemotaxis as well. We present …
A Mixed Consensus And Fuzzy Approach To Position Control Of Four-Wheeled Vehicles, Bita Hasheminezhad
A Mixed Consensus And Fuzzy Approach To Position Control Of Four-Wheeled Vehicles, Bita Hasheminezhad
LSU Master's Theses
Autonomous driving is a growing domain of intelligent transportation systems that utilizes communications to autonomously control cooperative vehicles. This thesis presents a multi-agent solution to the platoon control problem. First, an adaptive controller on linearized longitudinal dynamics of a vehicle is applied to assure vehicles are able to track their reference velocities. Then, an agent-based consensus approach is studied which enables multiple vehicles driving together where each vehicle can follow its predecessor at a close distance, safely. To deal with unexpected events, a fuzzy controller is added to the reference signal of the consensus controller. Simulation results are provided to …
Hydrodynamic Simulations Of The Prototype Mississippi River And Expanded Small-Scale Physical Model To Investigate Impact Of Sea Level Rise, Linsey Brooke Olivier
Hydrodynamic Simulations Of The Prototype Mississippi River And Expanded Small-Scale Physical Model To Investigate Impact Of Sea Level Rise, Linsey Brooke Olivier
LSU Master's Theses
The Expanded Small-Scale Physical Model (ESSPM) is a distorted-scale, moveable bed model that will complement numerical and field studies studying management strategies in the lower ~140 miles of the Mississippi River and their effect on flooding, navigation and coastal restoration. It is recognized that relative sea level rise (RSLR), the combination of eustatic sea level rise (ESLR) and subsidence, will have an impact on the hydraulics and sediment transport in the lower River. However, it is physically impossible to replicate subsidence in the ESSPM; thus, future RSLR conditions will be experimentally simulated by raising Gulf of Mexico (GoM) levels commensurate …
New Archiving, Fingering, And Assessing Techniques For Sheet Music Using Advanced Signal Processing Approaches, Ting-Chen Hsu
New Archiving, Fingering, And Assessing Techniques For Sheet Music Using Advanced Signal Processing Approaches, Ting-Chen Hsu
LSU Master's Theses
In this thesis, advanced signal processing techniques are proposed to archive the musical scores, guide the novice pianists to play piano with appropriate fingerings, and assess the harmonization for musical composition. The mathematical frameworks for these three applications are established and the corresponding optimization problems are formulated. The optimal solutions are also provided. First, the hard- and soft-archiving approaches for storing and distributing musical scores are investigated. By use of the popular musical scripting language, LilyPond, as the intermediate data format, we propose to encode the LilyPond script, which is converted from the original musical score, to the two-dimensional quick-response …
3-D Printed Conveyor For Continuous-Mode Cryopreservation Of Individual Samples, Melissa Kaye Eskridge
3-D Printed Conveyor For Continuous-Mode Cryopreservation Of Individual Samples, Melissa Kaye Eskridge
LSU Master's Theses
Lack of standardization of terminology and protocols, combined with limited access to freezing equipment due to cost constraints and lack of portability, has created a need for inexpensive cryopreservation devices. Distribution of standardized methods of freezing cells would enable the development and adoption of standards on materials and protocols. Some cryopreservation methods are limited by the amount of cells available and the toxicity of certain cryopreservation agents. These studies would benefit from the ability to cool individual samples. All commercially available and proposed cooling devices operate by cooling batches of samples at the same time. The cryopreservation conveyor was designed …
Spatial Biodegradation Of Mc252 Crude Oil On A Coastal Headland Beach, Zachary Joseph Romaine
Spatial Biodegradation Of Mc252 Crude Oil On A Coastal Headland Beach, Zachary Joseph Romaine
LSU Master's Theses
Following the Deepwater Horizon oil spill in April, 2010, hard structures were constructed to deter oil migration into sensitive marsh areas behind Fourchon Beach, LA These hard structures created conditions for accumulation and burial of oil across an 8 foot deep beach vertical profile. Buried oil persists in these areas due to anaerobic conditions of beach groundwater. The objectives of this thesis are to compare the rate and extent of biodegradation of 3-ring PAHs in crude oil deposits from the surface and subsurface, and to investigate effects on beach groundwater after introduction of O2. Field samples were removed from 2011-2016 …
Weld Quality Classification From Sensory Signatures In Friction-Stir-Welding (Fsw) Using Discrete Wavelet Transform And Advanced Metaheuristic Techniques, James Devecmon Roberts
Weld Quality Classification From Sensory Signatures In Friction-Stir-Welding (Fsw) Using Discrete Wavelet Transform And Advanced Metaheuristic Techniques, James Devecmon Roberts
LSU Master's Theses
Controlling the quality of welds is an essential part of high quality fabrications and ensuring structural integrity of welded joints and welded structures. Industry is in an endless pursuit to find more cost effective methods of testing welds for defects and eliminating them entirely. This Study contributes to this goal by investigating a new system with the ability to monitor welding conditions during the forging process. Monitoring the condition of the weld, while the metals are joined together is faster and more cost- effective than conventional methods of post-weld defect detection. In this study, the feedback signals are first collected …
A Comparison Between Functional And Traditional Interface Displays In Support Of Console Operator Performance And Workload, Sophie Lynn Schwartz
A Comparison Between Functional And Traditional Interface Displays In Support Of Console Operator Performance And Workload, Sophie Lynn Schwartz
LSU Master's Theses
In the petrochemical industry, schematic interfaces have been traditionally used as the main interface for console operators to monitor activities. There is limited research in this industry investigating alternative interface types to better support console operator’s decisions during alarm management. Furthermore, even less of that research includes eye-tracking as a measure for console operator situation awareness (SA). This research aimed to investigate an alternative interface, called a functional interface, in its level of support of console operator situation awareness, accuracy, subjective workload, and average response time. Additionally, eye-tracking was incorporated to explore its value as measure for situation awareness on …
Driver Engagement In Secondary Tasks: Behavioral Analysis And Crash Risk Assessment, Mengqiu Ye
Driver Engagement In Secondary Tasks: Behavioral Analysis And Crash Risk Assessment, Mengqiu Ye
LSU Master's Theses
Distracted driving has long been acknowledged as one of the leading causes of death or injury in roadway crashes. The focus of past research has been mainly on the change in driving performance due to distracted driving. However, only a few studies attempted to predict the type of distraction based on driving performance measures. In addition, past studies have proven that driving performance is influenced by the drivers’ socioeconomic characteristics, while not many studies have attempted to quantify that influence. In essence, this study utilizes the rich SHRP 2 Naturalistic Driving Study (NDS) database to (a) develop a model for …
The Influence Of Soil Properties On Marsh Edge Erosion, Cody Lee Johnson
The Influence Of Soil Properties On Marsh Edge Erosion, Cody Lee Johnson
LSU Master's Theses
Coastal Louisiana exhibits some of the highest rates of land conversion to open water in the world. This is most apparent in Terrebonne Bay, Barataria Bay, and Breton Sound (Couvillion et. al, 2011). The hypothesis is made that locally generated wind waves are responsible for the observed land loss. Recent research has attempted to relate the marsh edge erosion rate to wave energy flux density. Under the appropriate assumptions, this relationship is modeled reasonably well by a linear relationship between erosion rate and wave energy flux. Such a model is a valuable tool for coastal resource management. A deficiency of …
Biodegradation Of Buried Mc252 Oil In Coastal Beach Sands By Pah Degraders In Response To Oxygen Biostimulation, Leeann Renee Fitch
Biodegradation Of Buried Mc252 Oil In Coastal Beach Sands By Pah Degraders In Response To Oxygen Biostimulation, Leeann Renee Fitch
LSU Master's Theses
Six years following the Deepwater Horizon oil spill, buried MC252 oil persists on a beach segment in Fourchon, LA due to the natural anaerobic conditions of tidal groundwater. A field trial of in situ aerobic bioremediation of buried oil began on July 2015. Oxygen was added to the subsurface using Waterloo emitters which deliver O2 through diffusion via pressurized tubing in fixed groundwater wells. The multi-well injection system provided sufficient oxygen concentration in the groundwater in the immediate area of the emitters, resulting in a shift in the composition of the diverse, halophilic, hydrocarbon-degrading microbial population. Stable isotopic and radiocarbon …
Evaluation And Validation Of A Model To Predict The Effect Of Asphalt Mixtures And Vehicle Speed On Fuel Consumption Excess, Nirmal Dhakal
Evaluation And Validation Of A Model To Predict The Effect Of Asphalt Mixtures And Vehicle Speed On Fuel Consumption Excess, Nirmal Dhakal
LSU Master's Theses
The primary objective of this study is to evaluate the effects of asphalt concrete (AC) properties and vehicle speed on fuel consumption excess using a Three-Dimensional (3D) Finite Element (FE) approach. Secondarily, the effect of pavement design characteristics on energy dissipation was studied. Finite element modeling was used to simulate three flexible pavements typically used for low traffic volume, medium traffic volume, and high traffic volume. The effect of asphalt concrete mixes with different binders and varying percentages of Reclaimed Asphalt Pavement (RAP) on fuel consumption excess was studied. The FE models were validated based on field stress and strain …
Single-Family Housing Construction Cost In The Greater Baton Rouge Area, Justin Pierce Estes
Single-Family Housing Construction Cost In The Greater Baton Rouge Area, Justin Pierce Estes
LSU Master's Theses
Most research focused on housing costs has noted a paucity of empirical cost data for residential construction, and researchers have suggested that collecting these data for individual metropolitan areas is ideal. The goal of this study is to obtain these data and compare them to national average sources to determine how well national data represent local costs. Data collection included obtaining prices from big box stores and through a survey of local Baton Rouge residential contractors for material, square foot and assembly costs for the major components of a house (i.e. foundation, wall, roof). From the material cost data evaluated, …