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Articles 1291 - 1320 of 2820
Full-Text Articles in Engineering
A Framework To Incorporate A Structural Capacity Indicator Into The State Of Louisiana Pavement Management System, Omar Salaheldin Elbagalati
A Framework To Incorporate A Structural Capacity Indicator Into The State Of Louisiana Pavement Management System, Omar Salaheldin Elbagalati
LSU Doctoral Dissertations
Non-structural factors such as surface distresses and ride quality have been commonly used as the main indicators of in-service pavement conditions. In the last decade, the concept of implementing a structural condition index in Pavement Management System (PMS) to complement functional condition indices has become an important goal for many highway agencies. The Rolling Wheel Deflectometer (RWD) provides the ability to measure pavement deflection while operating at the posted speed limits causing no user delays. The objective of this study was two-fold. First, this study developed a model to predict pavement structural capacity at a length interval of 0.16 km …
On The Degradation Of Lubricating Grease, Asghar Rezasoltani
On The Degradation Of Lubricating Grease, Asghar Rezasoltani
LSU Doctoral Dissertations
A comprehensive literature review on physical and chemical degradation monitoring and life estimation models for lubricating greases is presented in chapter one. Degradation mechanisms for lubricating grease are categorized and described, and an extensive survey of the available empirical and analytical grease life estimation models including degradation monitoring standards and methods are presented. In chapter two, irreversible thermodynamic theory is employed to study the mechanical degradation of lubricating grease. A correlation between the mechanical degradation and entropy generation is established and the results are verified experimentally using a rheometer, a journal bearing test rig, and a modified grease worker machine. …
Physical Modeling Of Graphene Nanoribbon Field Effect Transistor Using Non-Equilibrium Green Function Approach For Integrated Circuit Design, Yaser Mohammadi Banadaki
Physical Modeling Of Graphene Nanoribbon Field Effect Transistor Using Non-Equilibrium Green Function Approach For Integrated Circuit Design, Yaser Mohammadi Banadaki
LSU Doctoral Dissertations
The driving engine for the exponential growth of digital information processing systems is scaling down the transistor dimensions. For decades, this has enhanced the device performance and density. However, the International Technology Roadmap for Semiconductors (ITRS) states the end of Moore’s law in the next decade due to the scaling challenges of silicon-based CMOS electronics, e.g. extremely high power density. The forward-looking solutions are the utilization of emerging materials and devices for integrated circuits. The Ph.D. dissertation focuses on graphene, one atomic layer of carbon sheet, experimentally discovered in 2004. Since fabrication technology of emerging materials is still in early …
Design And Analysis Of Geothermal Wellbore Energy Conversion System Working On Zero Mass Withdrawal Principle, Ildar Akhmadullin
Design And Analysis Of Geothermal Wellbore Energy Conversion System Working On Zero Mass Withdrawal Principle, Ildar Akhmadullin
LSU Doctoral Dissertations
This project is sponsored by the Department of Energy of the United States and dedicated to development of electricity production from the low-enthalpy geothermal reservoirs. The prime interest are reservoirs that are characterized by low temperature of heat source located in deep saline aquifers with high permeable rock. Usually energy production from these resources are not economical by using a conventional binary power plant approach. The presented PhD work is a study of a new system that utilizes a single-well technology and working on supercritical power cycle (PC). The wellbore energy conversion system is operating with Zero Mass Withdrawal (ZMW) …
Characterization Of Thermoplastic Fusion Bonding Of Microchannels Using Pressure Assisted Boiling Point Control System, Kavya Dathathreya
Characterization Of Thermoplastic Fusion Bonding Of Microchannels Using Pressure Assisted Boiling Point Control System, Kavya Dathathreya
LSU Master's Theses
An innovative method of thermoplastic fusion bonding using a pressure assisted boiling point control (PABP) system was characterized to determine the optimum parameters for bonding polymethyl methacrylate (PMMA) components containing microchannels and thin, 250 µm cover sheets. The PABP system enables precise control of the temperature boundary condition and the applied pressure by immersing the components being bonded in boiling water and varying the vapor pressure. Test structure geometries containing microchannels of two depths and four different aspect ratios were designed: 1:10 (Depth: 10µm, Width: 100 µm and Depth: 5µm, Width: 50 µm), 1:50 (Depth: 10µm, Width: 500µm and Depth: …
Evaluation Of Self-Healing Of Asphalt Concrete Through Induction Heating And Metallic Fibers, Yashwanth Pamulapati
Evaluation Of Self-Healing Of Asphalt Concrete Through Induction Heating And Metallic Fibers, Yashwanth Pamulapati
LSU Master's Theses
Healing by means of induction heating is promising, however the effectiveness of this technology is yet to be demonstrated due to limited studies on cracking damage and fracture resistance property recoveries after healing. The objective of this study was to test the hypothesis that a new generation of asphaltic materials could be artificially healed while in-service by embedding metallic fibers in the mix and by applying a magnetic field at the surface. To achieve this objective, an open-graded friction course (OGFC) was successfully designed and prepared to incorporate up to 5% steel and aluminum fibers by weight of the mix. …
A Model Compound Study In Syngas Tar Reforming, Jaren Lee
A Model Compound Study In Syngas Tar Reforming, Jaren Lee
LSU Master's Theses
Biomass or coal gasification are promising processes for renewable energy. However, a major operating problem in gasification is what to do with syngas byproducts such as H2S and tars (heavy hydrocarbons) that cause catalyst deactivation downstream. Studies have shown that rare earth oxides (REOs) doped with transition metals are promising catalysts for tar reforming in the presence of sulfur.(R. Li, Roy, Bridges, & Dooley, 2014) In Chapter 1, propane is studied as a model compound for tar reforming with transition metal-doped (e.g., Mn, Fe) REOs. These are compared to a typical commercial Ni/Al2O3 catalyst. The results showed that REO/TM catalysts …
Extracting Physically Realistic Pore Network Features From Xct Data And Investigating The Impact Of Pore Topology On Flow In Porous Media, Godfrey Mills
LSU Doctoral Dissertations
Synchrotron XCT imaging approaches applied in this study provides crucial information on the impact of image voxel resolution on image based simulation results and the characteristic length scales that can be extracted from XCT image data sets. The methods and results in this work provides a holistic approach in generating reliable and representative porous media flow and transport properties via image processing and pore scale simulations through XCT image data sets of porous media. This study also shows how XCT imaging, coupled with pore topological and morphological measures can be utilized in quantifying the differences, and/or similarities between a 2.5D …
Performance Evaluation Of Instrumented Geosynthetics Reinforced Paved Test Sections Built Over Weak Subgrade Using Accelerated Load Testing, Shadi Hanandeh
Performance Evaluation Of Instrumented Geosynthetics Reinforced Paved Test Sections Built Over Weak Subgrade Using Accelerated Load Testing, Shadi Hanandeh
LSU Doctoral Dissertations
Weak soil is a common problem in road construction. Whether it is a temporary access road or a permanent road built over a weak subgrade, a large deformation of the subgrade can lead to deterioration of the paved or unpaved surface. Geosynthetics offer a potentially economical solution for stabilizing roads built over weak soil. Three sets of testing programs were be conducted in this study.The first testing program includes conducting accelerated load testing of full-scale geosynthetic reinforced test lanes using rolling wheel load facility; the second program included conducting laboratory cyclic plate loading test on geosynthetic reinforced test sections constructed …
Process Monitoring And Data Mining With Chemical Process Historical Databases, Michael Carl Thomas
Process Monitoring And Data Mining With Chemical Process Historical Databases, Michael Carl Thomas
LSU Doctoral Dissertations
Modern chemical plants have distributed control systems (DCS) that handle normal operations and quality control. However, the DCS cannot compensate for fault events such as fouling or equipment failures. When faults occur, human operators must rapidly assess the situation, determine causes, and take corrective action, a challenging task further complicated by the sheer number of sensors. This information overload as well as measurement noise can hide information critical to diagnosing and fixing faults. Process monitoring algorithms can highlight key trends in data and detect faults faster, reducing or even preventing the damage that faults can cause. This research improves tools …
Production Of Fermentable Sugars From Energy Cane Bagasse, Saeed Oladi
Production Of Fermentable Sugars From Energy Cane Bagasse, Saeed Oladi
LSU Doctoral Dissertations
Lignocellulosic biomass contains cellulose and hemicellulose which are composed of hexose and pentose sugars. These sugars can be used in the sustainable production of fuels and chemicals. However, the recalcitrant nature of lignocellulosic biomass makes this conversion a challenging process. An effective pretreatment can remove lignin, solubilize the hemicellulose, decrease cellulose crystallinity, and prepare the biomass for enzymatic hydrolysis and conversion into green renewable chemicals. The research study presented in this dissertation addressed some of the challenges associated with the conversion of lignocellulosic biomass into green fuels and chemicals. This study was divided into three main goals. The first goal …
Development Of Single-Well Gas Assisted Gravity Drainage Process For Enhanced Oil Recovery, Bikash Deep Saikia
Development Of Single-Well Gas Assisted Gravity Drainage Process For Enhanced Oil Recovery, Bikash Deep Saikia
LSU Doctoral Dissertations
EOR application in prolific deepwater Gulf of Mexico (DGOM) reservoirs has remained a challenge. Exorbitant well cost (>200M$) precludes having extensive injection patterns and very characteristics of the reservoirs themselves are partly to blame for negligible EOR activity in DGOM. We have been able to develop and demonstrate a novel design in the form of Single Well – Gas Assisted Gravity Drainage (SW-GAGD) process, which is potentially cost effective, at the same time ensuring very high oil recoveries. In this design, a single well acts as an injector as well as a producer, thereby minimizing well cost. The efficacy …
Fabrication And Characterization Of Thiol-Acrylate Based Polymer For Bone Tissue Engineering Application, Anoosha Forghani
Fabrication And Characterization Of Thiol-Acrylate Based Polymer For Bone Tissue Engineering Application, Anoosha Forghani
LSU Master's Theses
Thiol-acrylate materials have been demonstrated to have therapeutic potential as biocompatible scaffolds for bone tissue regeneration due to their osteoconductivity, biodegradability, and well-suited mechanical properties. This study connects the mechanical properties and stability of thiol-acrylate polymer with cell adhesion and proliferation of human adipose derived stromal cells. The polymer presented in this study, trimethylolpropane ethoxylate triacrylate-co-trimethylolpropane tris (3-mercaptopropionate) (TMPeTA-co-TMPTMP), was synthesized by an amine-catalyzed Michael addition reaction. Physical, mechanical, and chemical characterizations were performed on the polymeric scaffold, followed by preliminary in vitro cytocompatibility tests. Live/dead staining assays showed significant differences in cell adhesion for TMPeTA (692 and 912 MW). …
Mathematical Scaling And Statistical Modeling Of Geopressured Geothermal Reservoirs, Esmail Ansari
Mathematical Scaling And Statistical Modeling Of Geopressured Geothermal Reservoirs, Esmail Ansari
LSU Doctoral Dissertations
The interest for developing geopressured-geothermal reservoirs along the US Gulf Coast is increasing for securing energy needs and reducing global warming. Identifying the most attractive candidate reservoirs for geothermal energy production requires quick and simple models. Analytical models are not always available and simulating each case individually is expensive. The use of scaling and statistical modeling is one approach to translate the output of a simulator into quick models with general applicability at all scales. The developed models can quickly estimate temperature and thermal energy recovery from the geopressured-geothermal reservoirs. These models can screen large databases of reservoirs to select …
Automated Generation And Visualization Of Initial Construction Schedules From Building Information Models, Yibrah Weldemihret Weldu
Automated Generation And Visualization Of Initial Construction Schedules From Building Information Models, Yibrah Weldemihret Weldu
LSU Doctoral Dissertations
Recent advances in digital technology have had a significant influence on the quality and speed of sharing and communicating project information in the architecture, engineering, and construction (AEC) industry. The process of acquiring the design intent in order to develop and communicate project schedules, as critical components of project delivery, have similarly been benefitting from such progress. With the relatively recent techniques of Building Information Modeling (BIM) and its capability to integrate the facility design with its construction schedule, meaningul strides have been made in improving the information flow and eventually visualizing the final schedule in 4D. However, the need …
Analysis And Management Of The Price Volatility In The Construction Industry, Alireza Joukar
Analysis And Management Of The Price Volatility In The Construction Industry, Alireza Joukar
LSU Doctoral Dissertations
The problem of price volatility as it pertains to material and labor is a major source of risk and financial distress for all the participants in the construction industry. The overarching goal of this dissertation is to address this problem from both viewpoints of risk analysis and risk management. This dissertation offers three independent papers addressing this goal. In the first paper using the Engineering News Record Construction Cost Index (ENR CCI), a predictive model is developed. The model uses General Autoregressive Conditional Heteroscedastic (GARCH) approach which facilitates both forecasting of the future values of the CCI, and capturing and …
Modelling Hydraulic Fracturing Propagation In Heterogeneous Reservoirs Using Cohesive Zone Methods, Miguel Alejandro Gonzalez-Chavez
Modelling Hydraulic Fracturing Propagation In Heterogeneous Reservoirs Using Cohesive Zone Methods, Miguel Alejandro Gonzalez-Chavez
LSU Doctoral Dissertations
The recent success in exploiting low permeability shale reservoirs has heavily relied on hydraulic fracturing to produce hydrocarbons economically in disadvantaged reservoir conditions. Although horizontal drilling significantly increases the contact area between the wellbore and the reservoir, the objective of hydraulic fracturing is set on creating further expanded conductive flow paths into the reservoir. This research uses cohesive zone method to numerically simulate hydraulic fracture propagation in the presence of natural fractures in two- and three-dimensional model. The Cohesive element approach limits fracture propagation to some predefined paths. However, in highly fractured formations since hydraulic fractures are growing through a …
Optimal Configuration Of Inspection And Rework Stations In A Multistage Flexible Flowline, Md. Shahriar Jahan Hossain
Optimal Configuration Of Inspection And Rework Stations In A Multistage Flexible Flowline, Md. Shahriar Jahan Hossain
LSU Master's Theses
Inspection and rework are two important issues of quality control. In this research, an N-stage flowline is considered to make decisions on these two issues. When defective items are detected at the inspection station the items are either scrapped or reworked. A reworkable item may be repaired at the regular defect-creating workstation or at a dedicated off-line rework station. Two problems (end-of-line and multistage inspections) are considered here to deal with this situation. The end-of-line inspection (ELI) problem considers an inspection station located at the end of the line while the multistage inspection (MSI) problem deals with multiple in-line inspection …
A Study Of Fpga Resource Utilization For Pipelined Windowed Image Computations, Aswin Vijaya Varma
A Study Of Fpga Resource Utilization For Pipelined Windowed Image Computations, Aswin Vijaya Varma
LSU Master's Theses
In image processing operations, each pixel is often treated independently and operated upon by using values of other pixels in the neighborhood. These operations are often called windowed image computations (or neighborhood operations). In this thesis, we examine the implementation of a windowed computation pipeline in an FPGA-based environment. Typically, the image is generated outside the FPGA environment (such as through a camera) and the result of the windowed computation is consumed outside the FPGA environment (for example, in a screen for display or an engine for higher level analysis). The image is typically large (over a million pixels 1000×1000 …
The Effects Of Carbon Nanotubes On Cells In A Synthetic Oxygen Carrier Enriched Alginate Scaffold, Joshua Paul Tate
The Effects Of Carbon Nanotubes On Cells In A Synthetic Oxygen Carrier Enriched Alginate Scaffold, Joshua Paul Tate
LSU Master's Theses
Abstract Huge progress has been made in the development of three dimensionally printed tissue structures. With the use of cells, three dimensional printers, and CAD drawing software, donor identical structures can be fabricated. However, cell scaffolds currently lack significant mechanical integrity which can result in reduced cellular survival, attachment, and nutrient delivery. For this reason, multiple strategies have been developed to increase and improve mechanical stability within engineered constructs without having to sacrifice cell viability. The hypothesis of this paper was that incorporating Perfluorotributylamine (PFTBA), a greenhouse gas, with single walled carbon nanotubes (SWCNT), a allotrope of carbon with a …
Rapid Cooling Of Eastern Oysters (Crassostrea Virginica) Using An On-Board Icing Unit To Slow The Growth Of Vibrio Vulnificus And Vibrio Parahaemolyticus, Melody Amber Thomas
Rapid Cooling Of Eastern Oysters (Crassostrea Virginica) Using An On-Board Icing Unit To Slow The Growth Of Vibrio Vulnificus And Vibrio Parahaemolyticus, Melody Amber Thomas
LSU Master's Theses
Oyster harvesting is a major industry along the Eastern and Gulf coasts of the United States. Eastern oysters (Crassostrea virginica) spawn when the waters start to warm between May and October in the Gulf of Mexico. The warmer temperature creates a problem with an increase of bacteria. The two major bacteria affecting the oyster industry are Vibrio vulnificus and Vibrio parahaemolyticus. These bacteria are the leading causes of seafood-borne illnesses in the United States. This increase of V. vulnificus and V. parahaemolyticus has led to stricter time/temperature requirements for harvesting oysters. The regulations are not plausible for smaller vessels too …
Modeling Churn And Annular Flow Regimes In Vertical And Near-Vertical Pipes With Small And Large Diameters, Erika Viana Pagan
Modeling Churn And Annular Flow Regimes In Vertical And Near-Vertical Pipes With Small And Large Diameters, Erika Viana Pagan
LSU Master's Theses
This thesis presents an improved model for gas-liquid two-phase flow in churn and annular flow regimes for small- and large-diameter in vertical and near-vertical pipes. This new model assumes that a net liquid film moves upward along the pipe wall and gas phase moves upward, occupying the majority of the central part of the pipes, and forming a gas core, in both flow regimes. The model is validated using field and laboratory experimental data from several different studies from the literature, in terms of pressure along the wellbore or bottomhole pressure for field conditions (for high-pressure flows in long pipes, …
Synthesis, Functionalization, And Characterization Of Metallic And Organic Nanoparticles For Biomedical Applications, Christopher Brian Sylvester
Synthesis, Functionalization, And Characterization Of Metallic And Organic Nanoparticles For Biomedical Applications, Christopher Brian Sylvester
Honors Capstones
No abstract provided.
Circuit Design For The Development Of A Non-Contact Ecg System, Nathan Blanchard
Circuit Design For The Development Of A Non-Contact Ecg System, Nathan Blanchard
Honors Capstones
No abstract provided.
Optimization Of Operational Costs In Data Centers, Shaoming Chen
Optimization Of Operational Costs In Data Centers, Shaoming Chen
LSU Master's Theses
The electricity cost of cloud computing data centers dominated by server power and cooling power is growing rapidly. To tackle this problem, inlet air with moderate temperature and server consolidation are widely adopted. However, the benefit of these two methods is limited due to conventional air cooling systems ineffectiveness caused by re-circulation and low heat capacity. To address this problem, hybrid air and liquid cooling, as a practical and inexpensive approach, has been introduced. In this work, we quantitatively analyze the impact of server consolidation and temperature of cooling water on the total electricity and server maintenance costs in hybrid …
Distributed Augmented Reality Communications And Interactions, Mitchell Mason
Distributed Augmented Reality Communications And Interactions, Mitchell Mason
Honors Capstones
No abstract provided.
Design And Optimization Of Nanoplasmonic Waveguide Devices, Pouya Dastmalchi
Design And Optimization Of Nanoplasmonic Waveguide Devices, Pouya Dastmalchi
LSU Doctoral Dissertations
In this dissertation, we introduce compact absorption switches consisting of plasmonic metal-dielectric-metal (MDM) waveguides coupled to multisection cavities. The optimized multisection cavity switches lead to greatly enhanced modulation depth compared to optimized conventional Fabry-Perot cavity switches. We find that the modulation depth of the optimized multisection cavity switches is greatly enhanced compared to the optimized conventional Fabry-Perot cavity switches due to the great enhancement of the total electromagnetic field energy in the cavity region. We then investigate how to improve the computational efficiency of the design of nanoplasmonic devices. More specifically, we show that the space mapping algorithm, originally developed …
Connected Vehicle Technology: User And System Performance Characteristics, Osama Abdulmonaem Thabet Osman
Connected Vehicle Technology: User And System Performance Characteristics, Osama Abdulmonaem Thabet Osman
LSU Doctoral Dissertations
The emerging connected vehicle (CV) technology plays a promising role in providing more operable and safer transportation environments. Yet, many questions remain unanswered as to how various user and system characteristics of CV-enabled networks can shape the successful implementation of the technology to maximize the return on investment. This research attempts to capture the effect of multiple factors such as traffic density, market penetration, and transmission range on the communication stability and overall network performance by developing a new CONnectivity ROBustness (CONROB) model. The model was tested with data collected from microscopic simulation of a 195 sq-mile traffic network and …
Evaluation Of Volumetric And Mechanistic Properties Of Asphaltic Mixtures: Design, Production And Construction, Samuel Booth Cooper Iii
Evaluation Of Volumetric And Mechanistic Properties Of Asphaltic Mixtures: Design, Production And Construction, Samuel Booth Cooper Iii
LSU Doctoral Dissertations
There has long been an understanding that differences exist between the asphalt mixture designed in the laboratory and the asphalt mixture produced in the asphalt plant. Additionally, variations between the mixtures compacted in the laboratory and mixtures extracted from the roadway have been observed. There is concern that asphalt mixtures produced through the plant and further compacted on the roadway are not representative of asphalt mixtures designed in the laboratory. This is especially a concern when field specimens (i.e. roadway cores) are used to evaluate the quality of the asphalt mixture. For the first time, a national effort has been …
Thiol-Ene Scaffolds As Synthetic Augments And Silicate Ceramics As Osteogenic Components For Bone Tissue Engineering Applications, Cong Chen
LSU Doctoral Dissertations
Bone tissue engineering approaches using polymer/ceramic composites show promise as effective biocompatible, absorbable, and osteoinductive materials. A novel class of in situ polymerizing thiol-acrylate based copolymers synthesized via an amine-catalyzed Michael addition was studied for its potential to be used in bone defect repair. Both pentaerythritol triacrylate-co-trimethylolpropane tris(3-mercaptopropionate) (PETA-co-TMPTMP) and PETA-co-TMPTMP with hydroxyapatite composites were fabricated in solid cast and foamed forms. These materials were characterized chemically and mechanically followed by an in vitro evaluation of the biocompatibility and chemical stability in conjunction with human adipose-derived mesenchymal pluripotent stem cells (hASC). The solid PETA-co-TMPTMP with and without hydroxyapatite (HA) exhibited …