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Articles 61 - 82 of 82
Full-Text Articles in Engineering
Evaluation Of Sweep Efficiency Of A Mature Co2 Flood In Little Creek Field, Mississippi, Didem Senocak
Evaluation Of Sweep Efficiency Of A Mature Co2 Flood In Little Creek Field, Mississippi, Didem Senocak
LSU Master's Theses
CO2 displacement is the most widely used EOR process, but poor sweep efficiency and large CO2 utilization rates are limitations to the economic and technical success of CO2 floods. Developing a methodology to maximize the sweep efficiency and minimize the CO2 utilization rate would greatly improve the economics of these fields. This thesis evaluates the sweep efficiency of a successful, late-in-life, continuous injection CO2 flood at the Little Creek Field, Mississippi. In this work, we evaluate several heterogeneity measures in terms of recovery efficiency and utilization rate. Core studies available from 41% of the wells in the field were used …
Development Of An Algorithm For Switching Compensator Control Based On The Currents' Physical Components Theory, Samuel Pearce
Development Of An Algorithm For Switching Compensator Control Based On The Currents' Physical Components Theory, Samuel Pearce
LSU Master's Theses
Development of a three-phase switching compensator algorithm, based on the Currents’ Physical Components (CPC) power theory and capable of performing in real time, is the subject of this thesis. The compensator algorithm could be implemented to control a PWM Inverter, which would perform as a shunt switching compensator of harmonic, reactive and unbalanced currents or a customizable combination of the three. The hardware used to demonstrate the ability of the algorithm to perform within the restraints or real time operation is a Motorola DSP56F807 evaluation mode DSP board and a set of voltage and current sensors. The Evaluation Board was …
Experimental Investigation Of Unsaturated Soil Stiffness, Ananth Bukkapatnam Tirumala
Experimental Investigation Of Unsaturated Soil Stiffness, Ananth Bukkapatnam Tirumala
LSU Master's Theses
Soil stiffness is a strain dependent non-linear parameter. Stiffness is the measure of soil deformation under a particular working load. It can used for predicting ground deformation in engineering earthworks such as highway embankments and foundations. Non-linear analyses for ground behavior have been widely used for developing models to predict the small –strain characteristics of the soil (Atkinson, 2000). This thesis provides a new insight into the behavior of soil stiffness. We used the wave propagation technique to determine the stiffness and term it as the small strain shear modulus (Gmax) of the soil. The objective of the thesis was …
Photocatalytic Oxidation Of Ethanol Using Macroporous Titania, Gibert Merle Magpantay
Photocatalytic Oxidation Of Ethanol Using Macroporous Titania, Gibert Merle Magpantay
LSU Master's Theses
Photocatalytic oxidation (PCO) using TiO2 is a potential means of remediating poor indoor air quality that is attributed to low levels of volatile organic compounds (VOC). In this work, ethanol is chosen as a simple compound representative of VOC’s. The aim of this research is to establish a baseline for the photocatalytic activity of TiO2 in ethanol PCO as well as the photonic efficiency of the photoreactor. The PCO conversion could then be enhanced by using photocatalyst having a macroporous structure. A flat plate photoreactor, UV light delivery and a flow system was designed in this work to accomplish ethanol …
Design, Fabrication, And Testing Of A Micro Fuel Injection Swirler For Lean Premixed Combustion In Gas Turbine Engines, Anthony Louis Giglio
Design, Fabrication, And Testing Of A Micro Fuel Injection Swirler For Lean Premixed Combustion In Gas Turbine Engines, Anthony Louis Giglio
LSU Master's Theses
Due to growing energy demands and the need for increased fuel consumption efficiency, environmental protection agencies are imposing more stringent emissions regulations on gas turbine combustion systems with emphasis on NOx emissions reduction. Emerging technological combustion schemes to reduce NOx commonly employ lean premixed combustion. Decreases in NOx are globally obtained by flame temperature decrease and locally improved by homogeneity of the reacting mixture. A new micro fuel injection swirler, capable of providing efficient and rapid mixing over a short distance, is presented in this thesis. The conception of the Micro Fuel Injection Swirler (MFIS) was motivated by the need …
Experimental Study Of A Foam Flow In Horizontal Pipes: Two Flow Regimes And Its Implications, Miodrag Bogdanovic
Experimental Study Of A Foam Flow In Horizontal Pipes: Two Flow Regimes And Its Implications, Miodrag Bogdanovic
LSU Master's Theses
Although foam has been widely used in many scientific and engineering applications, the current understanding of foam rheology in pipes is still very limited because of its complex nature. This experimental study, for the first time, investigates the flow rheology of foams in pipes by placing a special emphasis on two distinct foam flow regimes. A wide range of experimental conditions are examined in this study, which include five different surfactant formulations (Cedepal FA-406, Petrostep CG-50, Stepanform 1050, Aquet TD-600, and Ultra-Palmolive), three different surfactant concentrations (0.1, 1, and 5 wt %), two different pipe diameters (0.5 and 1 inch …
Quasi-Static And Impact Characterization Of Sandwich Structures With An Iso-Grid Stiffened Syntactic Foam Core, Venkata Sandeep Chakka
Quasi-Static And Impact Characterization Of Sandwich Structures With An Iso-Grid Stiffened Syntactic Foam Core, Venkata Sandeep Chakka
LSU Master's Theses
In this study, a novel hybrid sandwich structure with an integrated, iso-grid stiffened syntactic foam core was fabricated and evaluated by impact test and static test. Sandwich beams with different grid cell areas were prepared using a pin-guided dry weaving process. Low velocity impact test on different locations (rib, node, and bay) was conducted with varying hammer weight and impact velocities by an instrumented impact testing machine. Ultrasonic C-scan was utilized before and after impact to identify the damage induced by impact. Scanning Electron Microscopy observation was also implemented to visualize the impact damage at micro- length scale. Compressions after …
Magnetic Field Effects On Diffusion Flames, Diego F. Gonzalez
Magnetic Field Effects On Diffusion Flames, Diego F. Gonzalez
LSU Master's Theses
Magnetic field effects in combustion is an area of study that has previously been overlooked. The influence of magnetic fields on flames has only recently been explored and is of interest both from a scientific and a practical standpoint. This study provides theoretical, numerical and experimental evidence that combustion can be affected with the use of suitable magnetic fields. This thesis focuses on four different types of magnetic field: homogeneous, gradient, oscillating and pre-combustion. For the homogeneous field case, the Gibbs Free Energy method was used to determine the mole fraction of product species. It was found that homogeneous fields …
Impact Damage Between The Collision Of A Vessel And Protective Fender Systems, Paul Joseph Kocke
Impact Damage Between The Collision Of A Vessel And Protective Fender Systems, Paul Joseph Kocke
LSU Master's Theses
Vessel collision with bridge pilings can cause a catastrophic event and are occurring at an alarming rate. Such events can lead to the collapse of a bridge, causing deaths, shutting down a primary route of transportation and costing millions of dollars in repairs. Today, the AASHTO Bridge Code gives designers a methodology toward designing bridge pilings to withstand the impact of an errant vessel. However, bridges designed before this code was written require a protective system that is capable of redirecting a colliding vessel without causing severe damage to the pilings or the vessel. This research will look into three …
Modeling The Relationship Among Occupational Stress, Psychological/Physical Symptoms And Injuries In The Construction Industry, Omosefe Osarieme Abbe
Modeling The Relationship Among Occupational Stress, Psychological/Physical Symptoms And Injuries In The Construction Industry, Omosefe Osarieme Abbe
LSU Master's Theses
The construction industry has one of the highest incidents of fatal and non-fatal accidents/injuries every year. As a high risk industry, there is a need to investigate factors that affect the occurrence of these accidents to be able to protect workers. Traditional approaches to workers’ safety in the construction industry have focused on the physical and biomechanical aspects of work by improving tools, equipment and task completion methods. However, the impact of psychosocial factors, specifically stress as experienced by construction workers is an area of growing research. Research in the area of occupational stress in the Construction Industry is yielding …
Nanoclay Syntactic Foam Composites, Sameer Leo Peter
Nanoclay Syntactic Foam Composites, Sameer Leo Peter
LSU Master's Theses
Syntactic foams are composite materials in which the matrix phase is reinforced with hollow particles called microballoons. They possess low moisture absorption, low thermal conductivity and high damage tolerance because of their compositions. Traditionally, syntactic foams are used in many high strength applications such as in aerospace and marine industries, thus there is a need to achieve both high compressive strength and high fracture strain with minimal increase in density. This research studies the effect of nanoclay on the high strain rate mechanical properties of syntactic foams. Nanoclay reinforced syntactic foams are fabricated by adding 1, 2 and 5% volume …
The Design And Fabrication Of Pentacene Acoustic Charge Transfer Devices, Hua Shao
The Design And Fabrication Of Pentacene Acoustic Charge Transfer Devices, Hua Shao
LSU Master's Theses
Acoustic charge transport (ACT) devices are used to transfer electrical signals by surface acoustic waves (SAW), which are generated by interdigital transducers (IDT) on piezoelectric crystal substrates. In order to reduce fabrication cost, pentacene ACT is desired to transfer charge packages because of its reduced cost in. As some researchers reported, pentacene is a p type organic semiconductor, and can get high carrier mobility by growing in very pure crystalline structure under some specified growing conditions. In this project, charge transfer channel was made of crystal pentacene to form and carry the charge packages following SAW propagation. The pentacene ACT …
Voltage Dip Mitigation For Motor Starters Using An Adaptive High Speed Relay Protection On The High Voltage Transmission System, Cesar Alberto Rincon
Voltage Dip Mitigation For Motor Starters Using An Adaptive High Speed Relay Protection On The High Voltage Transmission System, Cesar Alberto Rincon
LSU Master's Theses
Currently, the aging state of the protection systems for industrial facilities is calling for a system-wide review of the equipment and the protection schemes used in all these places, calling for a new approach in the design and implementation of these systems. Some of these facilities house critical processes that can be seriously affected by a misoperation of equipment or a disturbance in the system, aspects ranging from safety of plant workers to millions of dollars in loss of production. In this thesis different contingency situations were explored for problems in the utility transmission system that could affect large industrial …
Modeling Of Solute Transport And Retention In Upper Amite River, Hoonshin Jung
Modeling Of Solute Transport And Retention In Upper Amite River, Hoonshin Jung
LSU Master's Theses
Streams play an important role in a solute transport through a stream network. Transient storage is one of the important processes that control mass exchange between a main stream and transient storage zones because of increase in the residence time of solute. In order to take account of the effect of transient storage on solute transport in streams, a variable residence time (VART) model was developed. The model is characterized by several features: (1) actual varying residence time was used, (2) no-user specified residence time distributions (RTD) were required, (3) less calibration parameters were involved as compared to existing models, …
An Investigation Into Fuel Cells And Flow Cytometers Optimal Design, Etim Sunday Udoetok
An Investigation Into Fuel Cells And Flow Cytometers Optimal Design, Etim Sunday Udoetok
LSU Doctoral Dissertations
The aim of the fuel cells part of this project was to investigate the performance of Proton Exchange Membrane Fuel Cells and closely related fuel cell types like the Alkaline Fuel Cells and Phosphoric Acid Fuel Cells. The investigation involved understanding the performance of fuel cells, addressing the shortcomings of currently used designs, and finding new methods for improving the performance of fuel cells. CFD was used to study flow channels and information learned from the study was used to design a new and improved flow channel. A prototype of the new design was fabricated, tested and found to perform …
Freezing Processes In Cell Suspensions Evaluated Using Cryomicroscopy, Tathagata Acharya
Freezing Processes In Cell Suspensions Evaluated Using Cryomicroscopy, Tathagata Acharya
LSU Master's Theses
This thesis aims at evaluating the freezing response of three different cell types, Pacific Oyster embryos, Jurkats and Helas, using the technique of cryomicroscopy. The choice of cells was primarily based on supporting ongoing research work at the Bioengineering Laboratory, Department of Mechanical Engineering at Louisiana State University in Baton Rouge. On a secondary basis, the cells were chosen based on their contrasting nature. While Pacific Oyster being a favorite food in USA calls for successful techniques of cryopreservation of their embryos in order to keep up with the growing demand, Jurkat and HeLa are undesired malignant human cells that …
Characterization And Development Of Axle Load Spectra To Enhance Pavement Design And Performance On The Basis Of New Mechanistic-Empirical Design Guide In Louisiana, Bharath Kumar Sridhar
Characterization And Development Of Axle Load Spectra To Enhance Pavement Design And Performance On The Basis Of New Mechanistic-Empirical Design Guide In Louisiana, Bharath Kumar Sridhar
LSU Master's Theses
For pavement design practices, several factors must be considered to ensure good performance of the pavement over the anticipated life cycle. Such factors include, but are not limited to, the type of paving materials, traffic loading characteristics, prevailing environmental conditions, and others. Traditional pavement design practices have followed the standards set by the American Society of State Highway and Transportation Officials (AASHTO) which require the use of an equivalent single axle load (ESAL - 18 kip single axle load) for design traffic input. Recently, a new mechanistic-empirical pavement design guide (MEPDG) was developed to improve pavement design practices. The guide …
Physical Layer Secrecy Channel Coding, Bandali K. Akkawi
Physical Layer Secrecy Channel Coding, Bandali K. Akkawi
LSU Master's Theses
Wireless communications is expanding and becoming an indispensable part of our daily life. However, due to its channel open nature, it is more vulnerable to attacks, such as eavesdropping and jamming which jeopardize the confidentiality of wireless data, compared to its counter-part, wireline communications. Security in wireless communication is thus a very important factor that should be perfected to accommodate the rapid growth of wireless communication today. Motivated by information theoretic secrecy definitions, we adopt a simple way to define the secrecy of a system by looking at its Bit-Error-Rate (BER) curves, the correlation of error vectors and Log Likelihood …
Airlift Assisted Wastewater Treatment, Brian Sidney Johnson
Airlift Assisted Wastewater Treatment, Brian Sidney Johnson
LSU Master's Theses
Static low density media (SLDM) filtration has been received with great admiration in the aquaculture industry and consequently spawned into the domestic wastewater setting on the pilot scale. This method of granular filtration uses plastic beads to facilitate the roles of both clarification and biofiltration into one compact unit. The fundamental operating principles utilized in this form of treatment can be greatly enhanced when they are coupled with self contained recirculation from airlift pumps. Recirculation of this type in a SLDM unit has the ability to provide multiple passes of the substrate in the wastewater through the bead bed to …
Experimental And Numerical Investigation Of Fluid Flow And Heat Transfer In Microchannels, Wynn Allen Phillips
Experimental And Numerical Investigation Of Fluid Flow And Heat Transfer In Microchannels, Wynn Allen Phillips
LSU Master's Theses
Microchannels are of current interest for use in heat exchangers where very high heat transfer performance is desired. Microchannels provide very high heat transfer coefficients because of their small hydraulic diameters. In this study, an investigation of fluid flow and heat transfer in microchannels is conducted. A review of the literature published regarding fluid flow and heat transfer in microchannels is provided in this study. A thorough background on the theory of internal convective heat transfer is provided as well. A critical analysis of some of the published heat transfer experiments on microchannels is also given. It was found that …
Cluster Kinetics Modeling Of Glassforming Materials, Lisa Ann Brenskelle
Cluster Kinetics Modeling Of Glassforming Materials, Lisa Ann Brenskelle
LSU Doctoral Dissertations
In this work, a new model relating temperature and pressure to dielectric relaxation or viscosity of a glassformer is developed. The model is based upon cluster kinetics, reaction-like mechanisms describing interactions between glassformer monomers and their clusters. Mathematical solutions of population balance equations for monomer and cluster lead to molar concentrations in terms of rate coefficients of the reaction-like mechanisms. These are then related to viscosity or dielectric relaxation time through free volume theory. The resulting equations are tested against data for a variety of pure glassformers, fragile, non-fragile, large, and small molecules over a wide range of temperatures, pressures, …
Three-Echelon Supply Chain Delivery Policy With Trade Credit Consideration, Farhana Rahman
Three-Echelon Supply Chain Delivery Policy With Trade Credit Consideration, Farhana Rahman
LSU Master's Theses
In recent years, collaboration in supply chain approach widely discussed in the literature; but most have dealt with the two-echelon systems. This study focuses on the just-in-time delivery policy of three-echelon supply chain by collaborative approach, where any of the information from the supply chain is available to all the subsystems involved; manufacturer, distribution center and retailer. In the first part of the study a simple model has been developed for a three-echelon supply system that consists of a single manufacturer, a single distribution center and a single retailer. The other part of the study extends this model by considering …