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Articles 91 - 120 of 120
Full-Text Articles in Engineering
Characterization Of Biocompatible Parylene-C Coating For Biomems Applications, Quoc Phuc Nguyen
Characterization Of Biocompatible Parylene-C Coating For Biomems Applications, Quoc Phuc Nguyen
LSU Master's Theses
This thesis characterizes parylene-C films with respect to biological micro-electro-mechanical system (BioMEMS) applications. BioMEMS devices have fueled the growth and research in the area of detecting, analyzing and identifying pathogens rapidly with precision in the bio-medical applications, thereby positively impacting millions of lives and made it extremely popular among researchers. These devices are fabricated using state-of-the-art techniques usually involving more than one material which typically has different biocompatibility and is not acceptable for various BioMEMS and biomedical applications; therefore, a special biocompatible coating is required. The parylene polymer is an example of such a coating as it is known for …
Cost And Performance Modeling Of The Mu-Decoder, Raghavendra Kongari
Cost And Performance Modeling Of The Mu-Decoder, Raghavendra Kongari
LSU Master's Theses
In this thesis we study the implementation details of the MU-Decoders, a recently proposed hardware module that has been theoretically shown to be superior to other methods for generating subsets of large sets. Our study confirms this advantage. Specifically, we compare the performance of implementations of the LUT-Decoder (the most common configurable decoder) to the MU-Decoder. We show that for while the LUT-Decoder is slightly better than the MU-Decoder for arbitrary (and artificial) inputs, for a large class of inputs called totally ordered subsets, that have practical significance, the MU-Decoder is vastly superior in area to the LUT-Decoder. In terms …
Replenishment Policies For A Tree-Type Three Echelon Supply Chain System, Ratkrit Rochanaluk
Replenishment Policies For A Tree-Type Three Echelon Supply Chain System, Ratkrit Rochanaluk
LSU Master's Theses
One of the common goals which most companies have is to maximize profits. There are two way to increase profit: increasing revenue or reducing cost. Lacking of ability to keep the cost down could potentially drive the companies out of the business. In recent years, many researchers have been paying more attention on improving supply chain system due to high potential of creating cost savings. The supply chain network considered in this research is a tree-type, three-echelon single producer, multiple distributors, and multiple retailers system. The goal of this research is to develop a replenishment policy which satisfies customers’ demand …
Simulation Study Of Sweep Improvement In Heavy Oil Co2 Floods, Venu Gopal Rao Nagineni
Simulation Study Of Sweep Improvement In Heavy Oil Co2 Floods, Venu Gopal Rao Nagineni
LSU Master's Theses
Enhanced oil recovery by CO2 injection is a common application used for light oil reservoirs since CO2 is relatively easily miscible with light oils. CO2 flooding in heavy oil reservoirs is often uneconomic due to unfavorable mobility ratios. Reservoir heterogeneity further complicates the process as CO2 channels through high permeability layers leading to premature breakthrough. However, this can be controlled by choosing a suitable modification to the CO2 injection process enabling better sweep efficiencies, and making the process economic. The current work focuses on two such methods; water-alternating-gas injection (WAG) and profile modification by blocking gas flow in the high …
Dry Reforming Of Methane On Rhodium And Nickel Substituted Pyrochlore Catalysts, Sarthak Gaur
Dry Reforming Of Methane On Rhodium And Nickel Substituted Pyrochlore Catalysts, Sarthak Gaur
LSU Master's Theses
Dry reforming of methane (DRM) has been widely investigated, with most studies showing rapid deactivation due to carbon deposition. This suggests a need to develop catalysts that limit carbon formation while avoiding structural changes at the elevated temperatures typical of this reaction. Here, we report CO2 reforming of methane on four pyrochlore catalysts. First, Rh was partially substituted for Zr in lanthanum zirconate (La2Zr2O7) to give La2Zr2-xRhxO7.5 (LRZ, x=0.112, 2 wt% Rh) pyrochlore. A second pyrochlore catalyst was synthesized in which Ca was further substituted into the La-site to give La1.95Ca0.05Zr2-xRhxO7 (LCRZ, x=0.055, 1 wt% Rh). A third catalyst was …
Interpretation Of Power Phenomena In Three Phase Systems With Neutral Using Instantaneous Reactive Power P-Q Theory, Rahul Anil Kantharia
Interpretation Of Power Phenomena In Three Phase Systems With Neutral Using Instantaneous Reactive Power P-Q Theory, Rahul Anil Kantharia
LSU Master's Theses
The Instantaneous Reactive power (IRP) p-q theory considered as a major power theory as well as a primary fundamental for switching compensator control in three-phase systems, is analyzed in order to verify its ability to describe and identify the power properties or power phenomena in a 3pN system with asymmetrical and non-sinusoidal voltages along with unbalanced loads. This analysis is an outcome of the misinterpretations of power phenomena in three-wire circuits shown by IRP p-q theory under non-sinusoidal conditions. Different load and supply conditions such as balanced, unbalanced and Harmonic generating loads along with asymmetrical and non-sinusoidal voltages are assumed …
Development And Validation Of Biomechanical Models To Quantify Horse Back Forces At The Walk In Three Horse Breeds, Laxmi Raghunandana Kaidapuram
Development And Validation Of Biomechanical Models To Quantify Horse Back Forces At The Walk In Three Horse Breeds, Laxmi Raghunandana Kaidapuram
LSU Master's Theses
Therapeutic horseback riding is a common component of physical therapy programs. Quantification of the horse back forces will provide vital information to match therapeutic riders with equine partners. To meet this medical need, a model to quantify the horse back forces from ground reaction forces was developed to test the hypothesis that the forces transferred to a static weight on the horse’s back can be predicted given horse breed and weight. Simultaneous, real time kinetic, kinematic, and back force data on a static weight were collected from 7 adult horses: 3 thoroughbreds, 3 quarter horses, and 1 paso fino. An …
An Euler Solver For Nonlinear Water Waves Using A Modified Staggered Grid And Gaussian Quadrature Approach, Qi Fan
LSU Master's Theses
A structured, finite-volume Euler solver for non-hydrostatic, free surface flows is developed to simulate coastal nonlinear dispersive water waves. A semi-implicit projection method which splits the pressure term into hydrostatic and non-hydrostatic parts is employed. A vertically shifted, staggered grid is designed to accommodate a new Gaussian discharge calculator and to facilitate the enforcement of a non-hydrostatic free-surface boundary condition. The Gaussian discharge calculator on the shifted grid increases the dispersion accuracy compared to traditional approaches that calculate discharges on a regular staggered grid. Numerical results are presented to demonstrate the improvements of these methods.
Parameter Tuning And Experimental Results Of Power System Stabilizer, Bixiang Tang
Parameter Tuning And Experimental Results Of Power System Stabilizer, Bixiang Tang
LSU Master's Theses
Power system stabilizers (PSS) have been studied for many years as a method to increase power system stability. This thesis focuses on the tuning and structure of the power system stabilizer. Different types of power system stabilizers are reviewed. The one studied in this thesis is the integral of accelerated power stabilizer. The generator control system is introduced to illustrate the working environment of the PSS. The mathematic model of the generator, automatic voltage regulator and PSS are analyzed and the system transfer function in presence of the PSS is derived. Base on the transfer function, a new tuning method …
Server Assignment In Mirrored Server Environments, Shawn Farlow
Server Assignment In Mirrored Server Environments, Shawn Farlow
LSU Master's Theses
Massively multiplayer online games (MMOGs) may use peer-to-peer, client-server, or mirrored-server environments. Since there exist multiple server options in mirrored server environments, a problem arises when deciding to which server each player should connect. We propose three distinct algorithms that assign players within Quality of Service (QoS) as each player joins and leaves, taking into consideration whether a player already in QoS can be moved to place a newly joining player in QoS without sacrificing QoS for the moved player. Our results show that for certain numbers of servers and values of QoS, our algorithms increase the total number of …
Characterization Of Novel Akermanite:Poly-E-Caprolactone Scaffolds For Bone Tissue Engineering Aapplications Combined With Human Adipose-Derived Stem Cells, Andre S. Zanetti
Characterization Of Novel Akermanite:Poly-E-Caprolactone Scaffolds For Bone Tissue Engineering Aapplications Combined With Human Adipose-Derived Stem Cells, Andre S. Zanetti
LSU Doctoral Dissertations
The development of porous materials useful as scaffolds for the sustained three-dimensional (3D) growth of human adipose-derived stem cells (hASC) is of particular interest to facilitate healing after musculoskeletal injuries. In this study, a composite porous material obtained by blending akermanite with poly-e-caprolactone (PCL) is proposed as novel alternative to bone tissue regeneration. The objectives of this study are (1) to characterize the akermanite:PCL scaffold properties; (2) to investigate the in vitro osteogenic potential of hASC loaded to optimal akermanite:PCL scaffolds; (3) to assess the metabolic activity and osteogenesis of hASC loaded to optimal akermanite:PCL scaffolds post-thawing using optimal cryopreservation …
Boron And Rare Earth Oxide Composite Nanoparticles For Enhancement Of Combustion, Jacob Hanberry
Boron And Rare Earth Oxide Composite Nanoparticles For Enhancement Of Combustion, Jacob Hanberry
LSU Master's Theses
Metallic fuels are of interest as additives in bio-fuel combustion because of their high heating values, and this thesis deals with the experimental investigation of boron nanoparticles and their effect on ethanol combustion. Two grades of boron nanoparticles were commercially purchased and modified to obtain different physical characteristics, by ball milling and sintering. Also, a mixture of rare-earth oxide (CeO2, La2O3, and Gd2O3) nanoparticles was synthesized and added to the boron nanoparticles in varying amounts to form composite mixtures. The effects of rare-earth oxides on boron combustion were investigated using these composites. Particle characterizations were carried out by X-ray diffraction, …
Power Management And Optimization, Hari Sundararajan
Power Management And Optimization, Hari Sundararajan
LSU Master's Theses
After many years of focusing on “faster” computers, people have started taking notice of the fact that the race for “speed” has had the unfortunate side effect of increasing the total power consumed, thereby increasing the total cost of ownership of these machines. The heat produced has required expensive cooling facilities. As a result, it is difficult to ignore the growing trend of “Green Computing,” which is defined by San Murugesan as “the study and practice of designing, manufacturing, using, and disposing of computers, servers, and associated subsystems – such as monitors, printers, storage devices, and networking and communication systems …
Surface-Enhanced Raman Spectroscopy Substrates Based On Nanoporous Silicon And Pattern Transfer, Pallavi Rao Malempati
Surface-Enhanced Raman Spectroscopy Substrates Based On Nanoporous Silicon And Pattern Transfer, Pallavi Rao Malempati
LSU Master's Theses
Surface-enhanced Raman scattering enhances the weak Raman scattering by using a roughened metal-coated surface as a catalyst. Roughness in the nanometer range provides the best enhancement. The nanostructures for the surface-enhanced Raman spectroscopy (SERS) substrates, in this work, are generated using an electrochemical etching process on silicon substrates. The patterns of nanoporous silicon thus generated are transferred onto transparent polydimethylsiloxane (PDMS) substrates using the “lift-off” process. An incomplex sputtering technique is employed to coat this substrate with a ~20 nm aluminum layer. Rhodamine 6G (R6G) molecules, when adsorbed to this metal surface, form the final SERS substrate that undergoes Raman …
Two-Stage Biaxial Thermomechanical Cycle Of Shape Memory Polymer Based Syntactic Foam, Abraham Michael King
Two-Stage Biaxial Thermomechanical Cycle Of Shape Memory Polymer Based Syntactic Foam, Abraham Michael King
LSU Master's Theses
A shape memory polymer (SMP) is a polymeric material that exhibits shape memory behavior. It can be “programmed” to take on a desired shape and “recovered” to revert back to its original shape. This ability to remember multiple shapes and switch between them with the application of a stimulus from an outside source is very desirable in certain applications. By dispersing glass microspheres in a SMP matrix, a syntactic foam is created that retains much of the shape memory capabilities but has higher strength and lower density than the pure SMP. These characteristics make this material a good candidate for …
Interfacial Shear Bond Strength Between Old And New Concrete, Zhifu Wan
Interfacial Shear Bond Strength Between Old And New Concrete, Zhifu Wan
LSU Master's Theses
The quality of the bonded concrete overlay depends on the bonding at the layer’s interface, which is affected by water to cement (w/c) ratio in new concrete, moisture condition of old concrete surface. The objective of this study is to quantify the interface shear bond strength affected by these variables. At the Phase I, twelve old concrete cubes with two different moisture conditions (air dry, saturated surface dry (SSD)) at the interface were chosen. Silica fume addition with two w/c ratios of 0.45 and 0.6 were used for new overlay concrete. It was found that silica fume significantly increased both …
A Study On The First-Passage Reliability Problem And Its Application In Earthquake Engineering, Sara Ghazizadeh
A Study On The First-Passage Reliability Problem And Its Application In Earthquake Engineering, Sara Ghazizadeh
LSU Master's Theses
The research presented in this thesis focuses on analytical approximations for the time-variant first-passage failure probability (FPFP) of linear elastic models of structural systems subjected to stochastic excitations. The FPFP is defined as the probability that a response quantity of an engineering system subjected to a dynamic stochastic loading outcrosses a specified threshold within a given exposure time. The FPFP is an important and useful quantity for many structural engineering applications. The classical first-passage reliability problem is studied for linear elastic single-degree-of-freedom (SDOF) and multi-degrees-of-freedom (MDOF) systems subjected to stationary and nonstationary Gaussian excitations. The absolute and relative accuracy of …
3d Quantification Of Particle Interaction Of Compacted Powders Using Synchrotron Micro Tomography (Smt), Md. Nafiul Haque
3d Quantification Of Particle Interaction Of Compacted Powders Using Synchrotron Micro Tomography (Smt), Md. Nafiul Haque
LSU Master's Theses
Synchrotron Micro Tomography (SMT) is a powerful, non-destructive scanning technique for studying the internal structure of materials. SMT was utilized for two applications in this thesis. The first application involves tracking particle rotation of aluminum powder under different compaction strains. The experiments were conducted on two geometrical configurations by applying axial load to compact the powder in the die and acquiring SMT scans at different strain levels. The SMT scans were processed using AVIZO visualization software for further analyses. The analyses included tracking the same particle at different compaction strain levels, analyzing their volume compressibility, and then quantifying their rotational …
Environmental Factors Impacting Coastal Beach Health, Kevin Michael Chenier
Environmental Factors Impacting Coastal Beach Health, Kevin Michael Chenier
LSU Master's Theses
The objectives of this research were to 1) determine the variability of fecal-indicator bacteria in Gulf of Mexico marine waters, 2) determine the effect of environmental variables on enterococci concentrations, 3) determine if beach sand at Holly Beach, LA was capable of acting as a reservoir for fecal-indicator bacteria, and 4) determine if a model could be developed to reduce the time it takes to issue a beach swim advisory. Fecal-indicator bacteria concentrations varied from year to year in historical data collected from a Gulf Coast beach. Afternoon fecal-indicator bacteria concentrations were consistently lower than morning concentrations, demonstrating daily variability. …
Implementation Of A Wireless Sensor Network With Ez430-Rf2500 Development Tools And Msp430fg4618/F2013 Experimenter Boards From Texas Instruments, Lu De Yang
LSU Master's Theses
Wireless sensor networks have found a great deal of applications in diverse areas. Recent interest has been focused on low-power feature of the sensor nodes because the power consumption is always an issue for wireless sensor nodes which are supplied from the batteries. The eZ430RF2500 Development Tool and MSP430FG4618/F2013 Experimenter Board from Texas Instruments have integrated MSP430 family of ultralow-power microcontrollers and CC2500 low-power wireless RF transceivers which are suitable for low-power, low-cost wireless applications. In this thesis, the features of these TI devices are explored and a wireless sensor network is implemented with these devices. To implement the routing …
The Effects Of Highway Environmental Conditions On Photocatalytic Pavement's Ability To Reduce Nitrogen Oxides, Heather Dylla
The Effects Of Highway Environmental Conditions On Photocatalytic Pavement's Ability To Reduce Nitrogen Oxides, Heather Dylla
LSU Master's Theses
Nitrogen oxides (NOx) emitted from vehicle exhaust are associated with negative health impacts and are a precursor to ozone. Self-cleaning, air-purifying concrete pavement is a rapidly emerging technology that can degrade pollutants such as NOx through heterogeneous photocatalysis. Although this technology has the potential to support environmentally friendly road infrastructure, a number of design and operational parameters may affect its effectiveness and thus need to be evaluated. The goal of this study was to measure the NOx reduction efficiencies from photocatalytic pavements under various environmental conditions common to highways. To achieve this goal, the objectives were to: (a) evaluate the …
The Design And Modification Of A Sputter System For Dc Reactive Sputtering Of Alumina And Zirconia Thin Films, Diane Van Ho
The Design And Modification Of A Sputter System For Dc Reactive Sputtering Of Alumina And Zirconia Thin Films, Diane Van Ho
LSU Master's Theses
Yttria-stabilized zirconia (7% YSZ) is the most used material for thermal barrier coatings (TBCs) to reduce the conductive heat transfer on turbine blades, but it is not resistant to infrared radiation. In order to reduce radiation heat transfer, alternating materials, such as alumina and zirconia, can be used to fabricate multi-layer coatings in which each layer is optimized to reflect a targeted range of wavelength. This research aims to fabricate these multi-layer coatings by reactive magnetron sputtering. Reactive magnetron sputtering is the sputtering of an elemental target in the presence of a reactive gas that will react with the target …
A Biomimic Self-Healing Shape Memory Polymer Based Syntactic Foam For Smart Structural Composites, Jones Nji
A Biomimic Self-Healing Shape Memory Polymer Based Syntactic Foam For Smart Structural Composites, Jones Nji
LSU Doctoral Dissertations
This study explored the development of a new self-healing Polystyrene Shape Memory Polymer (PSMP) based syntactic foam for service life extension in structural polymeric composites. The objective was to self-heal structural-length scale damage in an autonomous, efficient, timely and repeatable manner at the molecular-length scale. Self-healing is achieved through a novel two step close-then-heal (CTH) self-healing scheme, designed to mimic the natural biological process of wound healing in humans. A new methodology to fabricate three-dimensional (3-D) fiber reinforced shape memory polymer syntactic foam for structural applications was developed. The effect of impact energy on the ability for the 3-D fiber …
Analytical Design Method For Cold Production Of Heavy Oil With Bottom Water Using Bilateral Sink Wells, Wenting Qin
Analytical Design Method For Cold Production Of Heavy Oil With Bottom Water Using Bilateral Sink Wells, Wenting Qin
LSU Doctoral Dissertations
Few heavy oil reservoirs with strong bottom water drives have been developed successfully because of severe water coning. Water coning tends to cause low ultimate recovery, low well productivity, and high water production. Although thermal and gravity-assisted methods might improve recovery in oil reservoirs, such methods are widely perceived as either economically unfavorable or technologically infeasible. This study proposes a new, cold production technique, called Bilateral Water Sink (BWS), to meet those challenges. The BWS method suppresses water cresting by producing oil and water simultaneously from separate, horizontal wells completed in the oil and water zones; the oil and water …
Surface Functionalization Of Crystalline Silicon Substrates, Sri Sai Vegunta
Surface Functionalization Of Crystalline Silicon Substrates, Sri Sai Vegunta
LSU Doctoral Dissertations
In this work, various chemical and electrochemical methods were demonstrated to attach application-specific organic monolayers to crystalline silicon substrates. In one study, alkyl monolayers were anodically electrografted or thermally grafted onto planar (100) silicon substrates using Grignard precursors. The results show electrografted methyl monolayers provide a stable Si-C termination, resisting oxidation on (100) surfaces for approximately 55 days in air. The alkyl termination could provide a potential alternative to defective native oxides and kinetically unstable hydride surfaces. A mechanism involving two electron transfers per grafting event was established for both the thermal and electrochemical routes. In another study, unsaturated organic …
Measurement Of Spatial Variation Of Density Of Compacted Powder Using Synchrotron Microtomography, Yi Yang
Measurement Of Spatial Variation Of Density Of Compacted Powder Using Synchrotron Microtomography, Yi Yang
LSU Master's Theses
This research considers density change in powder metallurgy when compacting a powder blend in a die. In order to provide insights into particle behavior during compaction, atomized aluminum powders with an average particle size of 100 µm were used in two different compaction configurations. The compaction dies are cylindrical in shape: compaction configuration I displays an upper punch, a die, a lower punch, and a spacer. Compaction configuration II displays an upper punch, two dies, a lower punch, and a spacer with different geometry. The Synchrotron Microtomography scans were conducted on both compaction configurations. For compaction configuration I, the scan …
Analysis Of Static Lateral Load Test Of Battered Pile Group At I-10 Twin Span Bridge, Binay Pathak
Analysis Of Static Lateral Load Test Of Battered Pile Group At I-10 Twin Span Bridge, Binay Pathak
LSU Master's Theses
In offshore structures, battered piles have been used as an alternative to vertical piles because of their capability in resisting higher lateral loads. The foundations of the newly built I-10 Twin Span Bridge over Lake Pontchartrain, LA, mostly consist of battered piles group. Understanding the behavior of these batter pile group foundations under lateral loading is very important to the design of highway bridge foundations. This study focuses on the evaluation of the lateral responses of battered pile group subjected to lateral loading and assessment of the current design methodology used for the design of I-10 Twin Span Bridge over …
Supercritical Pyrolysis Of Toluene, Khue Dang Nguyen
Supercritical Pyrolysis Of Toluene, Khue Dang Nguyen
LSU Master's Theses
The development of future high-speed aircrafts will required the jet fuel to act as the primary engine coolant to absorb excess heat produced by the engine components. To aid in removing the excess heat and reducing the aircraft’s weight, future jet fuels used for high-speed aircrafts will act as both coolant and fuel; however, by exposing the fuels to temperatures and pressures above their critical point, they undergo pyrolysis to form larger and/or more abundant polycyclic aromatic hydrocarbons (PAH) and eventually carbonaceous solid deposits in the pre-combustion environment. The formation of solid deposits in the pre-combustion environment results in clogging …
Network Traffic Data Analysis, Harish Kapri
Network Traffic Data Analysis, Harish Kapri
LSU Master's Theses
The desire to conceptualize network traffic in a prevailing communication network is a facet for many types of network research studies. In this research, real traffic traces collected over trans-Pacific backbone links (the MAWI repository, providing publicly available anonymized traces) are analyzed to study the underlying traffic patterns. All data analysis and visualization is carried out using Matlab (Matlab is a trademark of The Mathworks, Inc.). At packet level, we first measure parameters such as distribution of packet lengths, distribution of protocol types, and then fit following analytical models. Next, the concept of flow is introduced and flow based analysis …
Evaluation Of Simultaneous Water And Gas Injection Using Co2, Shrinidhi Shetty
Evaluation Of Simultaneous Water And Gas Injection Using Co2, Shrinidhi Shetty
LSU Master's Theses
Miscible CO2 injection is the second largest contributor to global enhanced oil recovery, as it has successfully undergone extensive laboratory tests and field applications for recovering residual oil left behind after waterflooding. Prolific incremental recoveries have been obtained for some fields. Although miscible CO2 injections generally have excellent microscopic displacement efficiency they often result in poor sweep efficiency. In order to address sweep problems and maximize recoveries, other schemes of gas injection have been developed. Two such processes are water-alternating-gas (WAG) and simultaneous water-and-gas (SWAG) injection. WAG and SWAG have been successfully used to minimize poor sweep. Improved gas utilization …