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Articles 1981 - 2010 of 3180

Full-Text Articles in Engineering

Development Of Statistical Models For Predicting Leachate Parameters From Simulated Landfills, Arpita Hetal Bhatt Jan 2013

Development Of Statistical Models For Predicting Leachate Parameters From Simulated Landfills, Arpita Hetal Bhatt

Civil Engineering Dissertations - Archive

Leachate generation and management is recognized as one of the greatest problems associated with environmentally sound operation of landfills, as leachate can cause major pollution problems to surrounding soil, ground water, and surface waters. There are many landfills, especially in developing parts of the world like India, Bangladesh, Africa, and Latin America, where open dump systems are used for final disposal of solid waste rather than engineered landfills. In the near future, regulations in developing countries will likely require installation of liner systems, leachate collection systems, and treatment operations. A major requirement for successful leachate treatment is quantifying its typical …

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Improving Analysis Of Heavy To Extreme Precipitation Using Conditional Bias-Penalized Optimal Estimation, Ridwan Siddique Jan 2013

Improving Analysis Of Heavy To Extreme Precipitation Using Conditional Bias-Penalized Optimal Estimation, Ridwan Siddique

Civil Engineering Theses - Archive

Precipitation estimation is a very important topic from the societal perspective as heavy precipitation can cause flooding from which loss of lives and damage to properties can occur. In current practice, a number of spatial interpolation techniques are used for precipitation estimation using rain gauge data. Most of them are based on minimizing error variance but none of them consider Type-II conditional bias. As such, the existing techniques work well in the mid ranges of the precipitation distribution but tend to under- and overestimate large and small precipitation amounts, respectively. Conditional bias- penalized kriging (CBPK) adds a penalty term for …

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The Pivotal Role Of Fibrocytes On Foreign Body Reactions, David William Baker Jan 2013

The Pivotal Role Of Fibrocytes On Foreign Body Reactions, David William Baker

Bioengineering Dissertations - Archive

Fibrocytes are circulating connective tissue precursor cells that were first described in 1994 by Bucala et al. as mediators of the innate immune response [1]. Recently the notion of a fibrocyte has not only gained widespread acceptance, but these cells have been identified to participate in a number of disease and pathologic states including aberrant wound repair, fibrosis of organs, cardiovascular disease, and even normal aging. Despite these advancements, little was known about the response of these dynamic cells to biomaterial implants and foreign body reactions. The main focus of my thesis work has therefore focused on investigating fibrocyte-mediate responses, …

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Staged Construction Modeling Of Large Diameter Steel Pipes Using 3-D Nonlinear Finite Element Analysis, Mojtaba Salehi Dezfooli Jan 2013

Staged Construction Modeling Of Large Diameter Steel Pipes Using 3-D Nonlinear Finite Element Analysis, Mojtaba Salehi Dezfooli

Civil Engineering Dissertations - Archive

This study investigates the performance of large diameter steel pipes during stage construction. Using this study, metal pipes are designed utilizing existing native soil for embedment around the pipe rather than imported materials. This indeed, translates into a considerable amount of cost saving and advances in designing pipeline. This model is used for peer review/ designing of a 242 km (150 miles) pipeline project, Integrated Pipeline (IPL), that transports approximately hundreds of millions of gallons from Lake Palestine, 137 km (85 miles) southeast of Dallas, to Lake Benbrook, Tarrant County, Texas. The IPL project supplies water to more than1.8 million …

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A Comparative Study Of Carbon Nanotubes And Granular Activated Carbon: Physicochemical Properties And Adsorption Capacities, Roja Haritha Gangupomu Jan 2013

A Comparative Study Of Carbon Nanotubes And Granular Activated Carbon: Physicochemical Properties And Adsorption Capacities, Roja Haritha Gangupomu

Civil Engineering Dissertations - Archive

Adsorption technologies with activated carbon have proven their prominence in wide variety of industrial applications for the removal of pollutants from gaseous streams for generations. Nanoadsorbents due to their unique structure and the presence of high-energy binding sites can enhance adsorption of pollutants, particularly for hazardous pollutants difficult to control using conventional sorbents like activated carbon and can help industries in their struggle for greener technologies. The objective of this study was to characterize raw and purified CNTs and compare their physical and chemical properties to commercially available granular activated carbon (GAC). The CNT purification process was done in two …

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Stabilization Of High Sulfate Soils, Nagasreenivasu Talluri Jan 2013

Stabilization Of High Sulfate Soils, Nagasreenivasu Talluri

Civil Engineering Dissertations - Archive

Stabilization of expansive soils using lime and cement has been a favorite technique for practitioners over the years. However, recent heaving and premature pavement failures in lime and cement treated subgrades containing sulfates led to question the validity of calcium based stabilization. When expansive soils containing sulfates are treated with calcium based stabilizers, calcium from stabilizer reacts with soil sulfate and clay alumina to form expansive mineral Ettringite. Formation and growth of the mineral Ettringite was reported as the cause of severe heaving in several pavement failures. Under favorable environmental conditions Ettringite transforms in to another expansive mineral Thaumasite. This …

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Development Of A Model For Estimation Of Buried Large Diameter Thin-Walled Steel Pipe Deflection Due To External Loads, Jwala Raj Sharma Jan 2013

Development Of A Model For Estimation Of Buried Large Diameter Thin-Walled Steel Pipe Deflection Due To External Loads, Jwala Raj Sharma

Civil Engineering Dissertations - Archive

Design of buried pipeline systems involves solution of geotechnical and structural problems in addition to the hydraulics and mechanical issues. Just like any buried structure, it is of utmost importance to understand how the pipe interacts with the soil when subjected to external and internal loads. Based on the mode of withstanding loads, pipes are classified into two major categories, which are rigid and flexible pipes. Pipe material is the major factor governing the classification of a pipe being rigid or flexible. Rigid pipe is a pipe which is designed to withstand external dead and live loads and internal pressure …

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Noninvasive Assessment Of Tumor Hypoxia Using Oxygen Sensitive Mri In Prostate Tumor Models, Rashmi Reddy Pabhathi Reddy Jan 2013

Noninvasive Assessment Of Tumor Hypoxia Using Oxygen Sensitive Mri In Prostate Tumor Models, Rashmi Reddy Pabhathi Reddy

Bioengineering Theses - Archive

A variety of solid tumors reveal oxygen deficiency as a result of rapid growth and insufficient tumor angiogenesis. Hypoxia in solid tumors appears to speed up malignant progression and metastatic potential of primary tumors thus leading to resistance against anticancer drugs and decreased response to radiotherapy.Of various in vivo non-invasive techniques to assess tumor hypoxia, oxygen-sensitive MRI (BOLD and TOLD) is an attractive and reliable option. Blood Oxygen Level Dependent (BOLD) and Tissue Oxygen Level Dependent (TOLD) MRI offer potential insight into tumor hypoxia. BOLD (Blood Oxygen Level Dependant) contrast MRI which measures R2* (1/T2*) is sensitive to endogenous paramagnetic …

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Assessment Of Stress/Volume-Controlled Soil-Water Retention Properties Of Unsaturated Sandy Soils., Hailu Ayalew Jan 2013

Assessment Of Stress/Volume-Controlled Soil-Water Retention Properties Of Unsaturated Sandy Soils., Hailu Ayalew

Civil Engineering Theses - Archive

The main objectives of this work are to determine the effect of net normal stress and volume change on the soil-water retention properties of silty sand and clayey sand soils under stressed/volume-controlled conditions; to model soil-water retention parameters under stress/volume-controlled conditions; and to model the effect of higher net normal stress state on the soil-water retention characteristics of these two test soils based on the experimental test results. In order to investigate the effect of stress/volume change on the soil-water retention characteristics of these two test soils, two test methods were followed: the stress/volume-controlled soil-water characteristic test (Tempe pressure cell …

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Development Of Non-Invasive Methods For Imaging Inflammatory Response, Yi-Ting Tsai Jan 2013

Development Of Non-Invasive Methods For Imaging Inflammatory Response, Yi-Ting Tsai

Bioengineering Dissertations - Archive

Persistent inflammatory cell reactions are responsible for the pathogenesis of a variety of inflammatory diseases. Although many non-invasive imaging methods have been used in the clinics to monitor the extent of inflammatory responses, almost all of them are based on indirect detection of inflammation-associated anatomical or structure changes of tissues and organs. To fill the gap, our laboratory has focused research efforts on detecting different processes of inflammatory responses. Our results can be summarized in the sequence of inflammatory responses - edema formation, inflammatory cell recruitment, inflammatory product release, and cell death. Shortly after medical device implantation or injury, edema …

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Kinetics Analyses Of Interactions Between Oncogenic And Tumor Suppressor Proteins By Quantitative High Resolution Microscopy Methods, Shu-Fen Tseng Jan 2013

Kinetics Analyses Of Interactions Between Oncogenic And Tumor Suppressor Proteins By Quantitative High Resolution Microscopy Methods, Shu-Fen Tseng

Bioengineering Dissertations - Archive

DAB2IP is correlated to the risk of aggressive prostate cancer and loss of DAB2IP not only leads to epithelial-to-mesenchymal transition (EMT), but also makes cells radioresistant. These observations support the notion that improved knowledge of DAB2IP involvement in cellular pathways could be of help to cancer therapy. The goal of this work was to enable the study of how DAB2IP and some of its known key molecular partners interact in the cell by a combination of molecular biology techniques and recently reported quantitative fluorescence microscopy methods. The first part of this work was dedicated on investigating the interaction of DAB2IP …

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Implementation Of Fast Residual Quadtree Coding And Fast Intra Prediction In High Efficiency Video Coding, Sapna Vasudevan Jan 2013

Implementation Of Fast Residual Quadtree Coding And Fast Intra Prediction In High Efficiency Video Coding, Sapna Vasudevan

Electrical Engineering Theses - Archive

High Efficiency Video Coding, one of the latest video compression schemes proposed by Joint Collaborative Team on Video Coding (JCT-VC) which is a partnership between International Telecommunication Union Video Coding Experts Group (ITU T-VCEG) and International Organization for Standardization Moving Picture Experts Group (ISO/IEC MPEG), has been promoted to Final Draft International Standard (FDIS) on January 25, 2013. With three profiles: main, main10 and still-frame, it achieves far better compression ratio than already existing schemes, while maintaining visual quality.However, this superior bitrate savings is achieved at the expense of huge computational complexity which in turn means higher encoding time. One …

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Investigation And Modeling Of Voltage And Current Unbalance On A Three-Phase Submersible Pump, James Andrew Reed Jan 2013

Investigation And Modeling Of Voltage And Current Unbalance On A Three-Phase Submersible Pump, James Andrew Reed

Electrical Engineering Theses - Archive

During the summer months of 2011, a North Texas subdivision experienced tripping difficulty with the submersible pump which is used to transfer water from an underground well to an above ground water storage tank. The tripping events were random in nature but occurred often. Under the suspicion that unbalanced phase voltages/currents are to blame, the local electrical cooperative sampled the line voltages/currents for several days in order to confirm the suspicions and better understand what the cause of the tripping events were. This thesis will discuss the analysis of that data and the development of a Simulink® based computer aided …

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Discriminant Processing In Multi-Class Pattern Recognition Systems, Soumitro Swapan Auddy Jan 2013

Discriminant Processing In Multi-Class Pattern Recognition Systems, Soumitro Swapan Auddy

Electrical Engineering Theses - Archive

Multi-Layer Perceptron neural network classifiers face problems when applications have numerous output classes. A major problem is the fact that the MLP discriminant values given by the MLP differ considerably from the posterior probabilities of the Bayes decision rule. A non-linear mapping technique is developed in this thesis, which warps the neural network outputs into posterior probabilities. A second problem is that when the neural network is given inputs for classes it is not trained to handle, the output discriminant values become very noisy, as compared to the values seen for correct inputs. Variance based methods are investigated for detecting …

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Implementation Of An Out-Of-The Loop Post-Processing Technique For Hevc Decoded Depth Maps, Parashar Nayana Karunakar Jan 2013

Implementation Of An Out-Of-The Loop Post-Processing Technique For Hevc Decoded Depth Maps, Parashar Nayana Karunakar

Electrical Engineering Theses - Archive

When depth-maps are compressed using the existing video codecs, the compression artifacts introduce distortions in the rendered views. To get better rendering, it is important to get rid of these compression artifacts. The thesis achieves this by using a post-processing frame-work on HEVC decoded depth maps. The proposed method is based on compression artifact analysis of depth maps. It implements a post-processing filter frame-work with an edge-adaptive joint trilateral filter [43] which can effectively minimize the effects of compression artifacts from the HEVC decoded depth-maps. The rendered views before and after applying the post-processing filter are compared with respect to …

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A Two Stage, Three Step Approach To Mobile Robot Path Planning And Control, John Robert Konderla Jan 2013

A Two Stage, Three Step Approach To Mobile Robot Path Planning And Control, John Robert Konderla

Electrical Engineering Theses - Archive

The potential field control model provides a powerful, yet mathematically simple method to motivate a mobile robot. It is a local control method based on simple physical principles. This allows the robot to proceed toward a target while avoiding obstacles following a naturally smooth path. It ensures the robot will behave according to Newtonian principles that have been studied for centuries. The potential field model has several weaknesses however. Most of the weaknesses can be lessened through careful modification of the potential field but the success of this approach is limited. For further improvements, global methods must be employed. These …

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Efficient Hevc Loss Less Coding Using Sample Based Angular Intra Prediction (Sap), Pavan Gajjala Jan 2013

Efficient Hevc Loss Less Coding Using Sample Based Angular Intra Prediction (Sap), Pavan Gajjala

Electrical Engineering Theses - Archive

High Efficiency Video Coding (HEVC) [3] is the next generation video compression standard being jointly developed by the Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T WP3/16 and ISO/IEC JTC 1/SC 29/WG 11. The loss less coding is prominent in real-time applications like automotive vision, video conferencing and in web collaboration for remote desktop sharing. HEVC with the lossless mode can help in these applications effectively by providing content with certain level of compression when compared to other lossless compression techniques. This thesis focuses on improving the compression efficiency for the lossless coding mode of HEVC by using a …

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Enhancement Of Security And Reliability With Mimo Communication For The Smart Grid, Amit Abhimanyu Deokar Jan 2013

Enhancement Of Security And Reliability With Mimo Communication For The Smart Grid, Amit Abhimanyu Deokar

Electrical Engineering Theses - Archive

In smart grid applications, developing appropriate wireless communication architecture is extremely important as wireless communication faces security and reliability challenges. To combat severe communication impairment induced by invader, it is proposed to implement space-time block coding over virtual MIMO. With an increment of diversity in virtual MIMO, BER performance has been improved by 18dB. Furthermore, with more redundant copies of transmitted signals at receiver, reliability of system has increased by 4 times in 4x1 V-MIMO and by 8 times in 8x1 V-MIMO than traditional SISO case. Security challenges from malicious additive attack and data piracy have been examined. Simulations show …

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Intra Frame Luma Mode Prediction Using Neural Networks In Hevc, Dilip Prasanna Kumar Jan 2013

Intra Frame Luma Mode Prediction Using Neural Networks In Hevc, Dilip Prasanna Kumar

Electrical Engineering Theses - Archive

High Efficiency Video Coding, the latest video coding standard proposed by the JVT-VC and three profiles- HEVC main, main 10 and main intraframe were adopted in January 2013, provides significant amount of compression compared to older standards, while retaining similar visual quality. This is achieved at the cost of a computationally expensive encoding method.Intra frame coding contributes to a large portion of the computational complexity. In this research, a way to speed up the intra frame prediction mode decision using Artificial Neural Networks is proposed. The search for the correct prediction mode is simplified by using neural networks to analyze …

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Modeling And Characterization Of The Insulated Gate Bipolar Transistor In The Near-Threshold Region, Farah P. Vandrevala Jan 2013

Modeling And Characterization Of The Insulated Gate Bipolar Transistor In The Near-Threshold Region, Farah P. Vandrevala

Electrical Engineering Theses - Archive

The Insulated Gate Bipolar Transistor (IGBT) is a power semiconductor device widely used in high-speed switching applications. Due to aging and internal heating, the device is prone to a failure mechanism known as latch-up in which, changes in the threshold voltage and the on-state voltage of the device may ultimately lead to loss of switching control.Since IGBTs are typically operated at high voltages and currents, the datasheets do not provide information on the static characteristics of the device for voltages close to the threshold, which is a useful region for understanding the underlying device physics.In this thesis a simplified IGBT …

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Complexity Reduction In Hevc Intra Coding And Comparison With H.264/Avc, Vinoothna Gajula Jan 2013

Complexity Reduction In Hevc Intra Coding And Comparison With H.264/Avc, Vinoothna Gajula

Electrical Engineering Theses - Archive

ITU-T (VCEG) and ISO/IEC (MPEG) collaborated and formed the joint collaborative team on video coding (JCT-VC) in April 2010 to develop the next-generation video coding (NGVC) standard.. HEVC standard doubles the coding efficiency and the approximately 50% less bit rate with respect to H.264/AVC, at nearly the same video quality at expense of increased complexity. In this thesis, a technique is proposed to reduce the complexity of HEVC intra coding to get better encoding time, involving two steps - first by optimizing the PU (prediction unit) size decision process using texture complexity analysis by intensity gradients and second to obtain …

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Mesenchymal Stem Cells As Targeted Cell Vehicles To Deliver Drug-Loaded Nanoparticles For Cancer Therapy, Kytai Truong Nguyen Jan 2013

Mesenchymal Stem Cells As Targeted Cell Vehicles To Deliver Drug-Loaded Nanoparticles For Cancer Therapy, Kytai Truong Nguyen

Bioengineering Faculty Publications - Archive

No abstract provided.

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Thermo-Mechanical Analysis Of Nano-Imprint Lithography, Bhavik C. Patel Jan 2013

Thermo-Mechanical Analysis Of Nano-Imprint Lithography, Bhavik C. Patel

Mechanical and Aerospace Engineering Theses - Archive

Nanoimprint Lithography is being explored by the semiconductor industries for future high volume fabrication of silicon chips, memory devices and patterned media. Nanolithography and Microlithography has played pivotal role in the field of manufacturing microchips and integrated circuits in semiconductor devices. There is an urge to investigate Nanoimprint lithography, a high-throughput, low-cost and nonconventional lithographic method. Thermal management is a critical area that is necessary to be administrated. As recent advancements are being observed in the field of electronic packaging for thermal optimization, likewise steps are also important in this fabrication process. This process involves a heat that is generated …

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Compressibility Effects On The Non-Linear Receptivity Of Boundary Layers To Dielectric Barrier Discharges, Marie F.C. Denison Jan 2013

Compressibility Effects On The Non-Linear Receptivity Of Boundary Layers To Dielectric Barrier Discharges, Marie F.C. Denison

Mechanical and Aerospace Engineering Theses - Archive

The reduction of drag and aerodynamic heating caused by boundary layer transition is of central interest for the development of hypersonic vehicles. Receptivity to flow perturbation in the form of Tollmien-Schlichting (TS) wave growth often determines the first stage of the transition process, which can be delayed by depositing specific excitations into the boundary layer. Weakly ionized Dielectric Barrier Discharge (DBD) actuators are being investigated as possible sources of such excitations, but little is known today about their interaction with high-speed flows. In this framework, the first part of the thesis is dedicated to a receptivity study of laminar compressible …

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Rotordynamic Performance Of A Rotor Supported By Three Pad Hybird Foil Bearings With Controlled Air Injection, Sandesh Gudemane Jan 2013

Rotordynamic Performance Of A Rotor Supported By Three Pad Hybird Foil Bearings With Controlled Air Injection, Sandesh Gudemane

Mechanical and Aerospace Engineering Theses - Archive

Air Foil Bearings have found their place in the commercial applications of turbo machinery. They are cleaner and more reliable at high speeds than their conventional counterparts (Rolling Element Bearings). Low drag friction and apparently no contact during the operation results in a better service life and superior rotor-dynamic performance of the air foil bearings (AFBs). With these advantages AFB has proved to be a suitable option for oil-free turbo-machinery. Further development in AFBs suggest that pressurizing these bearings externally results in remarkably better load carrying capacity, heat dissipation and a more stable rotor. These externally air pressurized bearings which …

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Evaluation Of Surface Transportation Funding Alternatives Using Criteria System Established Through A Delphi Survey Of Texas Transportation Experts, Sasanka Bhushan Pulipati Jan 2013

Evaluation Of Surface Transportation Funding Alternatives Using Criteria System Established Through A Delphi Survey Of Texas Transportation Experts, Sasanka Bhushan Pulipati

Civil Engineering Dissertations - Archive

For more than a decade, transportation officials have been concerned that, at current levels, the fuel tax, the primary funding source of surface transportation in the United States, would not provide enough revenue to satisfy the ever rising transportation needs. Recent studies have evaluated alternative funding strategies at the national and state levels. In this dissertation, the author improves this evaluation procedure by developing a multi-criteria evaluation of different funding options for implementation in Texas using a technique called PROMETHEE. This evaluation uses a new criteria system established through his Delphi survey of Texas-based experts who are experienced in transportation …

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Development Of A Model To Simulate The Single-Limb Stance Phase Of Walking To Determine The Limits Of Stability, Clifford Lee Hancock Jan 2013

Development Of A Model To Simulate The Single-Limb Stance Phase Of Walking To Determine The Limits Of Stability, Clifford Lee Hancock

Bioengineering Theses - Archive

Falls during walking are the primary cause of injuries for older persons and present a high associated cost to society due to the resulting treatment. Hence, the control of balance while moving is an essential issue especially amongst the elderly population. Better understanding of why and how these falls occur could lead to better fall prevention methods, therapies, or devices. These changes could effectively decrease overall emergency room visits, create more room in hospitals for other demands, and decrease medical costs for fall-related disabilities and deaths amongst patients overall. This study attempted to develop an inverted pendulum model of the …

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Microfluidic Device For Determining Preferential Cell Migration Toward Extracellular Matrix Proteins, Neil Hall Jan 2013

Microfluidic Device For Determining Preferential Cell Migration Toward Extracellular Matrix Proteins, Neil Hall

Bioengineering Theses - Archive

Extracellular matrix (ECM) proteins interact with cells in bodily microenvironments by influencing their essential cellular processes in growth, survival, migration and repair after injury. In this study, a novel microfluidic device was developed to study preferential interactions of cells with multiple extracellular matrix proteins simultaneously in an unbiased manner. The implementation of PDITC-treated glass and a controlled laminar flow of multiple separated, soluble proteins was used to create an unbiased microenvironment in which ECM proteins are adsorbed on the glass surface in a manner that simultaneously exposes cells to multiple proteins, and allows them to migrate or outgrow toward the …

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Recombinant Expression, Purification And Kinetic Characterization Of F₄₂₀-Cofactor Dependent Glucose-6-Phosphate Dehydrogenase From Mycobacterium Tuberculosis, Tijani Osumah Jan 2013

Recombinant Expression, Purification And Kinetic Characterization Of F₄₂₀-Cofactor Dependent Glucose-6-Phosphate Dehydrogenase From Mycobacterium Tuberculosis, Tijani Osumah

Bioengineering Theses - Archive

The FGD (F₄₂₀-dependent Glucose-6-phosphate dehydrogenase) enzyme is an F₄₂₀ Cofactor (7,8-didemethyl-8-hydroxy-5-deazariboflavin) dependent enzyme found in Mycobacterium tuberculosis, the causative agent of tuberculosis (TB). TB is still a prominent cause of illness and death worldwide. Because FGD is not found in humans, makes it a good target for drug development. By understanding the hydride transfer mechanism of the FGD in detail, we can aid in the improvement of drug targeting and development for the treatment of TB. FGD catalyzes the conversion of glucose-6-phosphate to 6-phosophogluconolactone. This project focuses on the purification and kinetic characterization of recombinant FGD using steady-state and pre-steady …

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Improving Cooling Efficiency Of Servers By Replacing Smaller Chassis Enclosed Fans With Larger Rack-Mount Fans, Bharath Nagendran Jan 2013

Improving Cooling Efficiency Of Servers By Replacing Smaller Chassis Enclosed Fans With Larger Rack-Mount Fans, Bharath Nagendran

Mechanical and Aerospace Engineering Theses - Archive

As a common practice in the data center industry, chassis fans are used to direct air flow independent from neighboring servers. However, these fans are less efficient compared to larger rack level counterparts and also operate at higher sound levels. In this study, a novel approach is proposed whereby the smaller chassis enclosed fans are replaced with an array of larger fans, installed behind the stacked servers that share air flow. As a baseline study for comparison of the current scenario, a CPU dominated 1.5U Open Compute server, with four 60mm fans installed within the server, is characterized experimentally for …

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