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Articles 1561 - 1590 of 2820
Full-Text Articles in Engineering
Investigations Of The Effects Of Flame Configuration On The Combustion Of Laminar Diffusion Flame, Li Lu
Investigations Of The Effects Of Flame Configuration On The Combustion Of Laminar Diffusion Flame, Li Lu
LSU Doctoral Dissertations
Motivation and objective to study double inverse diffusion flame is introduced, followed by the literature survey on soot formation in inverse diffusion flame (IDF), application of the unique structure of double inverse diffusion flame (DIDF), radiation effects on DIDF, factors that affect the formation of nitric oxide and effects of elevated pressure on diffusion flames. Numerical method is validated by the result of flame height for IDF, which is consistent with result from previous research. In present work, two DIDF burner configurations with different size are used to conduct the simulation. Ethylene is used as the fuel. For each of …
3d Integration Of Micro- And Nanostructures Into Bio-Analytical Devices, Bahador Farshchian
3d Integration Of Micro- And Nanostructures Into Bio-Analytical Devices, Bahador Farshchian
LSU Doctoral Dissertations
This study aims to develop a process which allows 3D integration of micro and nanostructures in microchannels. A fabrication process was established for the large area integration of hierarchical micro and nanostructures in microchannels. This novel process, which is called 3D molding, takes advantage of an intermediate thin flexible stamp such as PDMS from soft lithography and a hard mold such as brass from hot embossing process. However, the use of a thin intermediate polydimethylsiloxane (PDMS) stamp inevitably causes dimensional changes in the 3D molded channel, with respect to those in the brass mold protrusion and the intermediate PDMS stamp …
Nanotube Film-Enhanced 3-D Photoanode For Application In Microsystems Technology, Fareed Dawan
Nanotube Film-Enhanced 3-D Photoanode For Application In Microsystems Technology, Fareed Dawan
LSU Doctoral Dissertations
Surface area plays an important factor in the energy conversion performance of solar cells. It has also emerged as a critical factor in the evolution of high-performance micro-electro-mechanical systems (MEMS) and multifunctional microstructures most of which will benefit from integrated on-chip solar power. Presented here is the hierarchical fabrication and characterization of TiO2 nanotubes on non-planar 3-dimensional microstructures for enhanced performance of the photoanode in dye-sensitized solar cells (DSSCs). The objective is to increase photoanode performance within a 1 cm2 lateral footprint area by increasing the vertical surface area through the formation of TiO2 nanotubes on 3-D microstructures. In the …
Metal-Based Microchannel Heat Exchangers : Manufacturing And Heat Transfer Testing, Bin Lu
Metal-Based Microchannel Heat Exchangers : Manufacturing And Heat Transfer Testing, Bin Lu
LSU Doctoral Dissertations
This dissertation focuses on improving the functionality of metal-based microchannel heat exchangers (MHEs), as well as pushing this technology toward real-world applications. Design optimization was carried out on MHEs for performance maximization. Double-layered microchannel layout was experimentally studied, and a significant reduction on liquid flow pressure drop penalty was achieved. Other than water, another commonly-used coolant, ethylene glycol, was applied to MHEs, and flow and heat transfer characteristics were quantified. Transient Liquid Phase (TLP) bonding was used for joining Cu structures. For further understanding of the MHE heat transfer, a detailed examination was carried out on the TLP bonding interface …
Resolving Pronominal Anaphora Using Commonsense Knowledge, Seyedeh Leili Javadpour
Resolving Pronominal Anaphora Using Commonsense Knowledge, Seyedeh Leili Javadpour
LSU Doctoral Dissertations
Coreference resolution is the task of resolving all expressions in a text that refer to the same entity. Such expressions are often used in writing and speech as shortcuts to avoid repetition. The most frequent form of coreference is the anaphor. To resolve anaphora not only grammatical and syntactical strategies are required, but also semantic approaches should be taken into consideration. This dissertation presents a framework for automatically resolving pronominal anaphora by integrating recent findings from the field of linguistics with new semantic features. Commonsense knowledge is the routine knowledge people have of the everyday world. Because such knowledge is …
Discrete Time Modeling And Control Of Dc/Dc Switching Converter For Solar Energy Systems, Shaghayegh Kazemlou
Discrete Time Modeling And Control Of Dc/Dc Switching Converter For Solar Energy Systems, Shaghayegh Kazemlou
LSU Master's Theses
Distributed generation networks including micro grids benefit from solar cells that are controlled by dc-dc converters. In this research a nonlinear discrete-time model for a buck converter tied to a solar system is derived with unknown internal dynamics. Then, adaptive neural network (NN) controller is employed to enhance stability of dc-dc converter connected to grid-tie inverter (GTI) in the presence of power system disturbances. The NN weights are tuned online by using a novel update law. By using Lyapunov techniques, all signals can be shown to be uniformly ultimately bounded (UUB). In addition, the interaction of the converter with the …
Electrophoretic Deposition Of Carbon Nanotubes On Silicon Substrates, Anirban Sarkar
Electrophoretic Deposition Of Carbon Nanotubes On Silicon Substrates, Anirban Sarkar
LSU Doctoral Dissertations
This dissertation research describes the feasibility study and investigation of Electrophoretic Deposition (EPD) of carbon nanotubes (CNTs) for applications in semiconductor research. In recent years, the EPD technique has been considered as an economical, room temperature, solution based wet coating technique for thin and thick CNT films on arbitrary substrates. In this study, fabrication of uniform coatings of acid-treated CNTs has been pursued on bare silicon substrates by EPD from aqueous and organic suspensions. Research endeavors are extended to examine EPD of CNTs on silicon substrates with various surface coatings such as metal (aluminum), insulator layers (silicon dioxide and silicon …
Achievable Secrecy Enchancement Through Joint Encryption And Privacy Amplification, Yahya Sowti Khiabani
Achievable Secrecy Enchancement Through Joint Encryption And Privacy Amplification, Yahya Sowti Khiabani
LSU Doctoral Dissertations
In this dissertation we try to achieve secrecy enhancement in communications by resorting to both cryptographic and information theoretic secrecy tools and metrics. Our objective is to unify tools and measures from cryptography community with techniques and metrics from information theory community that are utilized to provide privacy and confidentiality in communication systems. For this purpose we adopt encryption techniques accompanied with privacy amplification tools in order to achieve secrecy goals that are determined based on information theoretic and cryptographic metrics. Every secrecy scheme relies on a certain advantage for legitimate users over adversaries viewed as an asymmetry in the …
Fabrication And Characterization Of A Polymeric Nanofluidic Device For Dna Analysis, Jiahao Wu
Fabrication And Characterization Of A Polymeric Nanofluidic Device For Dna Analysis, Jiahao Wu
LSU Doctoral Dissertations
The growing needs for cheaper and faster sequencing of long biopolymers such as DNA and RNA have prompted the development of new technologies. Among the novel techniques for analyzing these biopolymers, an approach using nanochannel based fluidic devices is attractive because it is a label-free, amplification-free, single-molecule method that can be scaled for high-throughput analysis. Despite recent demonstrations of nanochannel based fluidic devices for analyzing physical properties of such biopolymers, most of the devices have been fabricated in inorganic materials such as silicon, silicon nitride and glass using expensive high end nanofabrication techniques such as focused ion beam and electron …
Feedback Control Of Sector-Bound Nonlinear Systems With Applications To Aeroengine Control, Luis Donaldo Alvergue
Feedback Control Of Sector-Bound Nonlinear Systems With Applications To Aeroengine Control, Luis Donaldo Alvergue
LSU Doctoral Dissertations
This dissertation is divided into two parts. In the first part we consider the problem of feedback stabilization of nonlinear systems described by state-space models. This approach is inherited from the methodology of sector bounded or passive nonlinearities, and influenced by the concept of absolute and quadratic stability. It aims not only to regionally stabilize the nonlinear dynamics asymptotically but also to maximize the estimated region of quadratic attraction and to ensure nominal performance at each equilibrium. In close connection to gain scheduling and switching control, a path of equilibria is programmed based on the assumption of centered-epsilon-cover which leads …
Fe(Iii)2o3 Nanoparticle Mediated Molecular Growth And Soot Particle Inception From The Oxidative Pyrolysis Of 1-Methylnaphthalene, Michael Paul Herring
Fe(Iii)2o3 Nanoparticle Mediated Molecular Growth And Soot Particle Inception From The Oxidative Pyrolysis Of 1-Methylnaphthalene, Michael Paul Herring
LSU Doctoral Dissertations
The potential for Fe(III)2O3 nanoparticles to participate in the molecular growth and particle inception of soot from 1-methylnapthalene (1-MN) was studied in a dual-zone, high-temperature flow reactor. An iron substituted, dendrimer template was oxidized in the Zone 1 reactor to generate ~5nm Fe(III)2O3 nanoparticles, that were continually seeded to a high sooting 1-MN fuel under oxidative pyrolysis conditions. The Fe(III)2O3 nanoparticles could then influence the otherwise gas-phase reactions of 1-MN. Increased PAH formation, soot number density, soot mass yield, and soot radical intensity were observed as a result of Fe(III)2O3 nanoparticle introduction prior to soot inception. Low Temperature Matrix Isolation-Electron …
Characterization And Uncertainty Analysis Of Siliciclastic Aquifer-Fault System, Ahmed Saad Elshall
Characterization And Uncertainty Analysis Of Siliciclastic Aquifer-Fault System, Ahmed Saad Elshall
LSU Doctoral Dissertations
The complex siliciclastic aquifer system underneath the Baton Rouge area, Louisiana, USA, is fluvial in origin. The east-west trending Baton Rouge fault and Denham Springs-Scotlandville fault cut across East Baton Rouge Parish and play an important role in groundwater flow and aquifer salinization. To better understand the salinization underneath Baton Rouge, it is imperative to study the hydrofacies architecture and the groundwater flow field of the Baton Rogue aquifer-fault system. This is done through developing multiple detailed hydrofacies architecture models and multiple groundwater flow models of the aquifer-fault system, representing various uncertain model propositions. The hydrofacies architecture models focus on …
Fast And Reliable Detection Of Incumbent Users In Cognitive Radios, Mahdi Orooji
Fast And Reliable Detection Of Incumbent Users In Cognitive Radios, Mahdi Orooji
LSU Doctoral Dissertations
Fast and reliable Spectrum Sensing (SS) plays a crucial role in the cognitive radio (CR) technology in order to prevent unwanted interference to the primary users (PU) and to reliably and quickly detect the white spaces in the spectrum for opportunistic access by the secondary users (SU). Spectrum Sensing must often be performed in the absence of information such as PU signaling scheme, noise level and channel fading coefficients. While these parameters can be estimated in the SU, estimation errors significantly deteriorates the performance of SS techniques. In this thesis, we introduce and evaluate the performance of two novel blind …
Modeling, Numerical Analysis, And Predictions For The Detonation Of Multi-Component Energetic Solids, Michael Wayne Crochet
Modeling, Numerical Analysis, And Predictions For The Detonation Of Multi-Component Energetic Solids, Michael Wayne Crochet
LSU Doctoral Dissertations
Metal powders are often used as an additive to conventional high explosives to enhance the post-detonation blast wave. Piston-impact simulations are commonly utilized to predict performance metrics such as detonation speed and strength, as well as assessing the impact and shock sensitivity of these materials. The system response is strongly influenced by the initial particle size distribution and material composition. Multiphase continuum models have been routinely applied at the macroscale to characterize the detonation of solid high explosives over engineering length scales. Current models lack a description of the physically permissible constitutive relations for mass transfer due to general chemical …
Wind Loading On Trees Integrated With A Building Envelope, Aly Mousaad Aly, Alberto Zasso, Girma Bitsuamlak, Alberto Nicola Longarini, Arindam Gam Chowdhury
Wind Loading On Trees Integrated With A Building Envelope, Aly Mousaad Aly, Alberto Zasso, Girma Bitsuamlak, Alberto Nicola Longarini, Arindam Gam Chowdhury
Faculty Publications
With the sustainability movement, vegetated building envelopes are gaining more popularity. This requires special wind effect investigations, both from sustainability and resiliency perspectives. The current paper focuses on wind load estimation on small- and full-scale trees used as part of green roofs and balconies. Small-scale wind load assessment was carried out using wind tunnel testing in a global-effect study to understand the interference effects from surrounding structures. Full-scale trees were investigated at a large open-jet facility in a local-effect study to investigate the wind-tree interaction. The effect of Reynolds number combined with shape change on the overall loads measured at …
Modeling Of Shear Strengthening Of Reinforced Concrete Beams Retrofitted With Externally Bonded Fiber Reinforced Polymers, Srinivasa Anusha Bellamkonda
Modeling Of Shear Strengthening Of Reinforced Concrete Beams Retrofitted With Externally Bonded Fiber Reinforced Polymers, Srinivasa Anusha Bellamkonda
LSU Master's Theses
This thesis presents a study on the shear retrofit of reinforced concrete (RC) beams with externally bonded fiber reinforced polymers (FRP), since it is very important for RC beam to have a shear strength that is higher than the flexural strength in order to ensure ductile flexural failure mode. The study proposes a new model to predict the FRP shear strength contribution for different modes of failure, i.e., bending, shear with FRP rupture, shear with FRP debonding, and mixed shear-flexure and various retrofit techniques, i.e., side-bonding, U-jacketing, and full wrapping. The proposed model is compared to other existing models for …
Design Flood Elevations Beyond Code Requirements And Current Best Practices, Frank H. Bohn
Design Flood Elevations Beyond Code Requirements And Current Best Practices, Frank H. Bohn
LSU Master's Theses
In the United States, nearly 9 million people, 3.0% of the population, live in areas subject to the 1% annual chance (100-yr) coastal flood hazard. New construction and substantial improvements in coastal high hazard areas require structures to be elevated above the design flood elevation (DFE), without the use of fill (Bellomo et al. 1999). Building code requirements for flood elevation are linked to the National Flood Insurance Program (NFIP) insurance policies, and represent the minimum requirement for building elevation. Current elevation procedures are limited to the 100-year base flood elevation with minimal guidance beyond the 100-year elevation in many …
Deflection Based Condition Assessment For Rolling Wheel Deflectometer At Network Level, Karthik Venkatesh Dasari
Deflection Based Condition Assessment For Rolling Wheel Deflectometer At Network Level, Karthik Venkatesh Dasari
LSU Master's Theses
The Rolling Wheel Deflectometer (RWD) is capable of measuring pavement deflection at high speeds without traffic interruption or compromising safety along tested road segments. To optimize the use of RWD at the network level, an assessment tool is needed to incorporate RWD data into current Pavement Management System (PMS) and to identify pavements in need of maintenance or rehabilitation. The objective of this study is to present the development of a screening tool, referred to as the pavement assessment triangular model, to predict pavement overall conditions based on RWD deflection, roughness measurements, and surface conditions as described by the Pavement …
Thermal, Compositional, And Salinity Effects On Wettability And Oil Recovery In A Dolomite Reservoir, Azadeh Kafili Kasmaei
Thermal, Compositional, And Salinity Effects On Wettability And Oil Recovery In A Dolomite Reservoir, Azadeh Kafili Kasmaei
LSU Master's Theses
Low salinity and composition effects in improving oil recovery in sandstone reservoirs are known. However, these effects have not been thoroughly studied for the carbonate reservoirs. Because of the lack of the clay minerals in the carbonate rocks, the mechanisms for the improved oil recovery with low salinity, brine composition, and temperature may not be the same as those for sandstones. This experimental study attempts to investigate the effects of low salinity, brine composition, and temperature on wettability and oil recovery in a dolomite reservoir. Also, it is attempted to confirm that wettability alteration is the main mechanism for improvement …
Instability Analysis And Suppression Of Instability In Low-Density Gas Jets, Sukanta Bhattacharjee
Instability Analysis And Suppression Of Instability In Low-Density Gas Jets, Sukanta Bhattacharjee
LSU Master's Theses
A numerical study is conducted to understand the global instability of very low-density jets (as encountered in thermal plasmas). The simulations have been carried out for different parameters of density ratios, S = ƒÏj /ƒÏ‡ ranging from 0.5 to 0.03, different Reynolds numbers ranging from 500 to 4000 and different momentum thickness obtained by different extension tube length ranging from 3 to 6 diameter long. The flow parameters and vortex structures has been visualized to understand the details of the evolution of the flow field. The axisymmetric shear layer rolls up in the near field of the jet forming vortex …
Erosional Resistance Of Cohesive Sediments In Coastal Saltmarshes, Hem Raj Pant
Erosional Resistance Of Cohesive Sediments In Coastal Saltmarshes, Hem Raj Pant
LSU Master's Theses
Louisiana’s saltmarshes, one of the most productive wetlands in the nation, are undergoing severe erosion due to hydrodynamic forces (storm surge) and sea level rise. The erosional behavior of coastal saltmarshes, which possess cohesive sediments as their integral components, are very difficult to analyze and understand. The erosional resistance of cohesive sediments determines the stability and sustainability of coastal wetlands. This erosional resistance is expressed as an erosion threshold or critical shear stress, which depends on various soil properties (e.g. water content, root content, organic matter content, and pore water salinity) affecting saltmarsh erodibility integratively. A cohesive strength meter was …
Reaction Of Green Leaf Volatiles As A Source Of Secondary Organic Aerosols In Fog Droplets, Amie Kathryn Hansel
Reaction Of Green Leaf Volatiles As A Source Of Secondary Organic Aerosols In Fog Droplets, Amie Kathryn Hansel
LSU Master's Theses
Green leaf volatiles (GLVs) are a group of biogenic volatile organic compounds (BVOCs) released into the atmosphere by vegetation when plants undergo stress or mechanical damage. BVOCs produce secondary organic aerosol (SOA) in the gas phase; however, their oxidation as a source of SOA in the liquid phase has not been investigated. Once released into the atmosphere, water-soluble GLVs partition into atmospheric water phases such as fog, mist, dew or rain, where they are oxidized by hydroxyl radicals (ÿOH). Photochemical oxidation yields products that are higher in molecular weight, more polar, more oxygenated, and lower in vapor pressure. When the …
Fault Observability In Distributed Power System, Hamidreza Nazaripouya
Fault Observability In Distributed Power System, Hamidreza Nazaripouya
LSU Master's Theses
Fault observability as well as fault location algorithms in distributed power system are studied in this thesis. The importance of finding the fault location in a distribution system with the purpose of increasing reliability and decreasing the maintenance time and cost is discussed. Then, different existing fault location algorithms and approaches in the literature are introduced and compared. Subsequently, a new strategy to achieve fault observability of power systems while aiming minimum required number of Phasor Measurement Units (PMUs) in the network is proposed. The method exploits the nodal voltage and mesh current analyses where the impedance and admittance matrices …
The Diagnosis Of Well Control Complications During Managed Pressure Drilling, Brian Piccolo
The Diagnosis Of Well Control Complications During Managed Pressure Drilling, Brian Piccolo
LSU Master's Theses
The constant bottom-hole pressure method of managed pressure drilling is generally expected to reduce well control risks and apply well understood concepts when a kick is taken. Nevertheless, complications, such as operator error, leaks, plugging, equipment failures, and exceeding kick tolerance, can occur during kick circulation. By not properly interpreting the symptoms of a complication, a driller risks the consequences of additional influx, lost circulation or the simultaneous occurrence of both. To address the challenge of diagnosing complications, the implied pit gain (IPG) method is being evaluated as an enhancement to established industry practices. Traditional diagnostic methods attempt to match …
Degradation And Inhibition Of Chlorinated Ethanes And Ethenes In A Two Bed, Sequential Bioremediation System, Alex Boudreau
Degradation And Inhibition Of Chlorinated Ethanes And Ethenes In A Two Bed, Sequential Bioremediation System, Alex Boudreau
LSU Master's Theses
A continuous-flow system composed of two anaerobic bioreactor (ABR) columns (based on engineered wetland systems) connected in series was tested to observe the ability of such a system to treat multiple volatile organic compounds (VOCs) possessing suspected inhibitory effects on the dechlorination of other compounds with cis-1,2-dichloroethylene (cDCE) and 1,1-dichloroethane (1,1-DCA) as the main test chemicals. Following the establishment of cDCE and 1,1-DCA dechlorinating ability at baseline conditions, system perturbations of breakthrough and starvation were conducted to measure the response and recovery of the system dechlorination. In all column experiments, it was observed cDCE dechlorination inhibited the dechlorination of 1,1-DCA …
Development Of Watershed-Based Modeling Approach To Pollution Source Identification, Yangbin Tong
Development Of Watershed-Based Modeling Approach To Pollution Source Identification, Yangbin Tong
LSU Master's Theses
Identification of unknown pollution sources is essential to environmental protection and emergency response. A review of recent publications in source identification revealed that there are very limited numbers of research in modeling methods for rivers. What’s more, the majority of these attempts were to find the source strength and release time, while only a few of them discussed how to identify source locations. Comparisons of these works indicated that a combination of biological, mathematical and geographical method could effectively identify unknown source area(s), which was a more practical trial in a watershed. This thesis presents a watershed-based modeling approach to …
Study On Effects Of Supply Voltage Asymmetry And Distortion On Induction Machine, Prashanna Dev Bhattarai
Study On Effects Of Supply Voltage Asymmetry And Distortion On Induction Machine, Prashanna Dev Bhattarai
LSU Master's Theses
Performance of induction motor supplied with asymmetrical and nonsinusoidal supply voltages is studied in this thesis. Theory of induction motor is first presented for sinusoidal symmetrical supply voltages. Equations for the torque, losses, currents and efficiency are derived. Appropriate changes are made to apply this theory to induction motors operating at nonsinusoidal and asymmetrical supply voltages. Single phase equivalent circuit of the induction motor is presented for both asymmetrical and nonsinusoidal supply voltages. The equations governing operating characteristics are presented. Machine torque, losses, current and efficiency for asymmetrical and nonsinusoidal supply voltages are compared with the same for sinusoidal symmetrical …
Comprehensive Study Of The Dye Sensitized Solar Cell, Gregory Lewis Vick
Comprehensive Study Of The Dye Sensitized Solar Cell, Gregory Lewis Vick
LSU Master's Theses
A complete electrical model of the dye-sensitized solar cell has been presented. This model relates the material parameters of the cell to the cell’s performance. The full model is reduced to an Idealized form and simulated to find an idealistic power curve or current (I) – voltage (V) curve. The operating parameters of reflectivity, temperature, reverse saturation current and ideality factor are investigated. A sensitivity analysis is completed to determine what parameters have a dominating influence on the overall cell performance. It was found, for the ideal case of the dye sensitized solar cell, that the factors of absorptivity, temperature, …
Automated Sensor Platform For Distribution Pattern Characterization Of Agricultural Equipment, Maziar Amirani
Automated Sensor Platform For Distribution Pattern Characterization Of Agricultural Equipment, Maziar Amirani
LSU Master's Theses
Design and calibration of spreading equipment for agricultural materials are critically important but is facing some limitations in time and costs. Lack of personnel and environmental constraints, as well as equipment features present challenges in the calibration process and results. The major objective of this project was to introduce and investigate the feasibility of integration of automated electrical equipment into this calibration process in order to optimize the overall procedure in terms of cost, time and precision as an ultimate goal. Specific objectives focused on optical techniques as well as novel accelerometer technology. A photo based method in detection of …
Design And Implementation Of A Very Short Retention Time Filtrate Clarifier, Santiago Alfredo Grimaldo
Design And Implementation Of A Very Short Retention Time Filtrate Clarifier, Santiago Alfredo Grimaldo
LSU Master's Theses
Filtrate, which accounts for almost 15 to 20% of the mixed juice produced in a raw sugar factory, is usually recirculated, which is detrimental to the process. This can lead to: increased sugar inversion and reduction in both sugar quality and clarifier performance. Previous attempts on filtrate clarification have shown limitations for its implementation due to the long residence times of the clarifiers, complex operations and low quality of clarified filtrate. A filtrate clarification pilot plant using a very short residence time clarifier (10 minutes) was designed and tested during the 2012 Louisiana sugarcane harvesting season. Louisiana Low Turbulence technology …