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Articles 1831 - 1860 of 2904
Full-Text Articles in Engineering
New Detonation Concepts For Propulsion And Power Generation, Eric Braun
New Detonation Concepts For Propulsion And Power Generation, Eric Braun
Mechanical and Aerospace Engineering Dissertations - Archive
A series of related analytical and experimental studies are focused on utilizing detonations for emerging propulsion and power generation devices. An understanding of the physical and thermodynamic processes for this unsteady thermodynamic cycle has taken over 100 years to develop. An overview of the thermodynamic processes and development history is provided.Thermodynamic cycle analysis of detonation-based systems has often been studied using surrogate models. A real gas model is used for a thermal efficiency prediction of a detonation wave based on the work and heat specified by process path diagrams and a control volume analysis. A combined first and second law …
Hygrothermally Stable Laminated Composites For Optimal Extension Twist Coupling In Closed Cell Configuration, Sean Muder
Hygrothermally Stable Laminated Composites For Optimal Extension Twist Coupling In Closed Cell Configuration, Sean Muder
Mechanical and Aerospace Engineering Theses - Archive
An optimization routine utilizing the sequential quadratic programming method is used to develop laminates that are hygrothermally stable in flat-strip configuration and are optimal for extension twist coupling in closed cell configuration. The performance of the laminates obtained from the optimization in terms of the level of extension twist coupling and hygrothermal stability are evaluated and compared to laminates from a previous routine. A parametric study is conducted to illustrate the relationships between the geometric dimensions of a representative closed cell section and the level of extension twist coupling. Results from the parametric study suggested a more practical optimization approach …
Dynamic System Reduction And Fault Location Identification Using Synchrophasors, Eithar Nashawati
Dynamic System Reduction And Fault Location Identification Using Synchrophasors, Eithar Nashawati
Electrical Engineering Dissertations - Archive
The advent of the synchronized phasor measurement units' technology allow for new applications to the power systems and improvement of existing applications. This dissertation presents a new method for synchrophasor-assisted fault location. An initial screening of voltage phase angle swing determines the suspect part of the system where the disturbance occurred. The system is then reduced to a limited number of buses. A Positive-sequence voltage-only method is then used to provide a better estimation of the exact location of the fault using particle swarm optimization. This method is applied to a large power system in North Texas. Real-time synchrophasor measurement …
Multi-Directional Light Coupling Structures For Nanomembrane Photonic Integration, Tapas Kumar Saha
Multi-Directional Light Coupling Structures For Nanomembrane Photonic Integration, Tapas Kumar Saha
Electrical Engineering Dissertations - Archive
Vertical coupling of light within an in-plane nanophotonic waveguide is an essential step towards the successful future realization of CMOS compatible optical interconnects and photonic integrated circuits. This is especially important, since silicon, though being the material of choice, is an extremely poor emitter of light. Through vertical to in-plane coupling, light can be coupled through any point on the planar on chip and the position is not only confined within the edges of the silicon wafer. Compact wafer scale testing is possible with this approach, without the need for polished edge cleaving. Another important aspect of this research is …
Accelerated Simulation Of Supercapacitors Using Order Reduction Techniques And Waveform Relaxation Methods, Fatih Cingoz
Accelerated Simulation Of Supercapacitors Using Order Reduction Techniques And Waveform Relaxation Methods, Fatih Cingoz
Electrical Engineering Theses - Archive
Supercapacitors are promising energy storage devices due to their capability to deliver high peak current and to capture a huge amount of energy in a short time with very low internal power loss. They are candidate component to be used in as a secondary energy storage device in hybrid electric vehicles (HEV)). Precise model development and accelerated simulation environments are needed to minimize the design time (and subsequently the product-to-market time) and minimize the hardware redesign and retrofit. Transmission line and RC parallel-branch equivalent models show relatively higher accuracy in predicting the dynamic behavior of the device. They also have …
Characterization Of Flexible Antennas For Wirelessly Powering Medical Implants, Safwan Ahmed Muneer
Characterization Of Flexible Antennas For Wirelessly Powering Medical Implants, Safwan Ahmed Muneer
Electrical Engineering Theses - Archive
To minimize the trouble experienced by the patient in undergoing invasive surgeries to replace non rechargeable batteries that are used to power body implants inside, medical experts and engineers are emphasizing on making use of wireless power. Since body implant powering from external wireless power requires a source that can be easily worn outside the body, a special type of integrated antenna was implemented on a flexible substrate that conforms to the shape of the stomach curvature, thus adding increased patient comfort. The antenna bend is concave which adds to increased focus and increases power transfer efficiency to power the …
Complexity Reduction Of H.264 Using Parallel Programming, Sudeep Prakash Gangavati
Complexity Reduction Of H.264 Using Parallel Programming, Sudeep Prakash Gangavati
Electrical Engineering Theses - Archive
The H.264 encoder provides for adaptive directional intra-prediction, motion-compensated inter-prediction followed by transform, quantization, deblocking filtering and either variable length encoding or arithmetic coding. All these blocks of the H.264 encoder make it highly complex as compared to previous video coding standards. There is a need for measures to reduce the complexity. This thesis aims at reducing the complexity of the .H.264 encoder by reducing the encoding time of the H.264 standard while not sacrificing the video quality, compression efficiency and bitrate by parallel programming. There are several parallel programming models that can be used. The massively parallel Graphics Processing …
Design, Microfabrication And Characterization Of A Microheater Platform For Studying Dna-Surface Interactions, Annas Javed
Design, Microfabrication And Characterization Of A Microheater Platform For Studying Dna-Surface Interactions, Annas Javed
Electrical Engineering Theses - Archive
The past few decades have witnessed significant research towards developing DNA biosensors and gene chips. These devices obtain sequence-specific DNA information in a faster, simpler and cheaper manner compared to traditional hybridization assays. Miniaturization of DNA handling and processing devices has contributed significantly towards this effort. Despite the large amount of work in this research direction, much more needs to be understood about the fundamental interactions of DNA and other biological macromolecules with their microenvironment, particularly with inorganic surfaces. For example, a basic understanding of thermal interactions of DNA with surfaces may help develop novel strategies for probing, purifying and …
Design Of Embedded Nios Ii Processor Based System For Implementing Bridging Algorithm Of Profiling Application, Vinay S. Ashi
Design Of Embedded Nios Ii Processor Based System For Implementing Bridging Algorithm Of Profiling Application, Vinay S. Ashi
Electrical Engineering Theses - Archive
The Texas Department of Transportation (TxDOT) uses multiple instruments for quality assurance of new and existing pavements. These instruments measure the different characteristics of the pavement such as the longitudinal profile, transverse profile, texture, rutting, etc. to determine the smoothness and ride quality of the pavement. These instruments mainly consist of different sensors such as lasers, accelerometers, distance encoders, etc., to calculate the ride quality. Various ride statistics such as International Roughness Index (IRI), Mean Profile Depth (MPD), and Present Serviceability Index (PSI) are then calculated and used to monitor the conditions of the roads.The Roline laser system is used …
Development Of Magnetic-Based Multi-Layer Microparticles For Stem Cell Isolation, Enrichment And Detachment, Sonia Santimano
Development Of Magnetic-Based Multi-Layer Microparticles For Stem Cell Isolation, Enrichment And Detachment, Sonia Santimano
Bioengineering Theses - Archive
Stem cells have been studied and used in several cell-based therapies for regenerative medicine, 3D tissue-engineered scaffolds, and in vitro models for drug screening and testing. For instance, cell based therapy via the use of stem cells like Endothelial Progenitor Cells (EPCs) to treat patients with cardiovascular diseases, including ischemic heart disease, in-stent restenosis, and peripheral arterial occlusive disease. In addition, Circulating Cancer Cells (CSCs) have been used as an indication of cancer progression-free survival and for studying the mechanisms of tumor formation, metastasis, and anti-cancer drug screening. Due to their extensive diagnostic and therapeutic potential, various techniques have been …
Quantification And Comparisons Of Motion Metrics For Finger Tapping Performed By Children With Cerebral Palsy Before And After Therapy With Two Motion Tracking Camera Systems, Ankita H. Chainani
Quantification And Comparisons Of Motion Metrics For Finger Tapping Performed By Children With Cerebral Palsy Before And After Therapy With Two Motion Tracking Camera Systems, Ankita H. Chainani
Bioengineering Theses - Archive
The quantification of any improvements in the use of a paretic arm after children with cerebral palsy (CP) undergo rehabilitation is currently done by occupational therapists who administer a series of manual ability tests and assign a subjective score for each test task performed. In this work the hypothesis was explored of whether quantification of hand motion metrics by motion tracking while children with CP performed a hand tapping task could be used as a more quantitative surrogate for assessing how well these children control the use of their hand. To that end, two children with CP, both classified as …
Spectrophotometric Quantification Of Bilirubin In Sclera Of The Eye Using Visible Dlp® Hyperspectral Imaging, Naveen Balaji Balasubramanian
Spectrophotometric Quantification Of Bilirubin In Sclera Of The Eye Using Visible Dlp® Hyperspectral Imaging, Naveen Balaji Balasubramanian
Bioengineering Theses - Archive
In clinical settings doctors strive to give best care to the patients by looking for methods to diagnose the illness early to intervene with the necessary treatment. In the case of patients with liver problems (e.g. cirrhosis, hepatitis) an early indicator of impaired liver function is an increased concentration of bilirubin in the blood circulation. Bilirubin concentration is currently quantified by blood sampling, which is invasive, and it would be desirable to have a technology that quantifies bilirubin non-invasively. The goal of this work was to help address this clinical need and develop a methodology for determining non-invasively a measure …
Antimicrobial Properties Of Citric Acid Based Polymers, Lee-Chun Su
Antimicrobial Properties Of Citric Acid Based Polymers, Lee-Chun Su
Bioengineering Theses - Archive
A series of citric acid derived polymers synthesized in our lab were investigated and compared for their physiochemical and antimicrobial properties. We selected citric acid based polymers since citric acid is a product of natural metabolism. These polymers are not only biocompatible but also possess an antimicrobial effect. In polymer synthesis, citric acid (CA) provides profound functional groups available for binding and crosslinking to allow the controllable crosslinking degrees of polymers. A number of citric acid based polymers has been synthesized and studied for their chemical, mechanical, and biological characteristics for use in various biomedical applications. Since bacterial infections became …
Regenerative Peripheral Nerve Interfacing Of Sensory Modalities, Nilanjana T. Dutta
Regenerative Peripheral Nerve Interfacing Of Sensory Modalities, Nilanjana T. Dutta
Bioengineering Theses - Archive
Peripheral neural interfaces (PNI) has proved potential to record motor commands for the control of these prosthetic limbs, together with stimulation of specific sensory axons, so as to transmit specific sensory sub-modalities. Although PNI is hypothesized to provide adequate sensory feedback, realizing this degree of specificity is not fully established. Recently, a regenerative multi-electrode interface (REMI) was reported to be capable of recording peripheral nerve activity from a transected nerve. This study is aimed at interfacing neural activity specific to sensory sub-modalities, such as thermal pain, mechanoception and limb stretching using the REMI, in a freely moving animal. In the …
Characterization Of Immune Response And Peripheral Nerve Regeneration Of Implanted Regenerative Multi-Electrode Interface Post-Subchronic Amputation, Camilo Andres Sanchez Useche
Characterization Of Immune Response And Peripheral Nerve Regeneration Of Implanted Regenerative Multi-Electrode Interface Post-Subchronic Amputation, Camilo Andres Sanchez Useche
Bioengineering Theses - Archive
Interfacing high degree-of-freedom robotic prosthetics directly to the peripheral nervous system aims at improving the quotidian life of amputees. Despite advancements in robotics that have lead to human-like upper limb prosthetics, long-term interfacing has not been accomplished, thus voiding them from clinical use. Interfacing electrodes in the central nervous system fail due to the foreign body reaction and glial scar formation at the site of implantation. Concrete mechanisms for the failure of long-term Interfacing at the peripheral nervous level remain unclear. A regenerative multi-electrode interface (REMI) which allows for action potential recording as early as 7 days and provides support …
Using An Ahp/Anp Hybrid Methodology For Freight Transport Networks Selection Towards Sustainable Transportation, Andrea M. Graham
Using An Ahp/Anp Hybrid Methodology For Freight Transport Networks Selection Towards Sustainable Transportation, Andrea M. Graham
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
The selection of an effective transportation network for the transport of container freight is one of the most important factors in supply chain and logistics planning. The current transport networks, hub-and-spoke and point-to-point, although optimal in many aspects are still plagued with issues in route optimization, empty travel, and bad intermodal synchronization. The trucking industry, the most utilized of all modes, offers unsustainable components in its current state that continually introduce negative impacts to an ever evolving supply chain network. This research investigates a third potentially more sustainable distributed multi-segment transportation network. This network will be compared to the traditional …
Constraint Optimal Selection Techniques (Costs) For Linear Programming, Goh Saito
Constraint Optimal Selection Techniques (Costs) For Linear Programming, Goh Saito
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Simplex pivoting algorithms remain the dominant approach to solve linear programming (LP) because they have advantages over interior-point methods. However, current simplex algorithms are often inadequate for solving a large-scale LPs because of their insufficient computational speeds. This dissertation develops the significantly faster simplex-based, active-set approaches called Constraint Optimal Selection Techniques (COSTs). COSTs specify a constraint-ordering rule based on constraints' likelihood of being binding at optimality, as well as a rule for adding constraints. In particular, new techniques for adding multiple constraints in an active-set framework, and an efficient constraint-ordering rule for LP are proposed. These innovations greatly reduce computation …
Design, Calibration And Testing Of A Force Balance For A Hypersonic Shock Tunnel, Pravin Vadassery
Design, Calibration And Testing Of A Force Balance For A Hypersonic Shock Tunnel, Pravin Vadassery
Mechanical and Aerospace Engineering Theses - Archive
The forces acting on a flight vehicle are critical for determining its performance. Of particular interest is the hypersonic regime. Force measurements are much more complex in hypersonic flows, where those speeds are simulated in shock tunnels. A force balance for such facilities contains sensitive gages that measure stress waves and ultimately determine the different components of force acting on the model. An external force balance was designed and fabricated for the UTA Hypersonic shock tunnel to measure drag at Mach 10. Static and dynamic calibrations were performed to find the transfer function of the system. Forces were recovered using …
Guidance And Control Of Unmanned Airships For Waypoint Navigation In The Presence Of Wind, Ghassan M. Atmeh
Guidance And Control Of Unmanned Airships For Waypoint Navigation In The Presence Of Wind, Ghassan M. Atmeh
Mechanical and Aerospace Engineering Theses - Archive
Airships are a specific class of Lighter-Than-Air (LTA) vehicles. These vehicles achieve lift mainly through buoyancy; the usually ellipsoidal shaped hull contains a lifting gas such as helium, which produces the required lift though air displacement. Due to this method of operation an airship has the ability to conduct low-power hover, which makes it ideal for applications requiring hovering over long periods of time such as surveillance, terrain mapping, meteorology and GPS. In such applications the conventional fixed wing unmanned aircraft is less suitable. The work presented in this thesis deals with designing a controller that is capable of navigating …
Heat Transfer Enhancement In A Rectangular Channel Using Vortex Generator In A Laminar Flow, Ninad C. Maniar
Heat Transfer Enhancement In A Rectangular Channel Using Vortex Generator In A Laminar Flow, Ninad C. Maniar
Mechanical and Aerospace Engineering Theses - Archive
Enhancement of heat transfer through various means has been an intense area of research for many years. There are numerous applications where high performance heat exchange is desired. The cooling of electronics, such as microprocessors, is one example. The recent rise in the studies of heat exchange enhancement techniques has also lead to efficient and compact heat exchangers. This research involves the numerical analysis of heat exchange enhancement in a rectangular channel using different types of longitudinal vortex generators (LVG) for a laminar flow. A computational fluid dynamics software package was used to compute the 3-D steady viscous flows with …
Cfd Analysis Of Direct Evaporative Cooling Zone Of Air-Side Economizer For Containerized Data Center, Niket Shah
Cfd Analysis Of Direct Evaporative Cooling Zone Of Air-Side Economizer For Containerized Data Center, Niket Shah
Mechanical and Aerospace Engineering Theses - Archive
Conventional data centers are extremely large buildings that have complex power distribution and cooling systems. These traditional brick and mortar data centers employ relatively expensive cooling systems and are inefficient. It has in turn led to an increase in construction and operational costs. Jonathan Koomey, Ph.D. of Lawrence Berkeley National Laboratory estimated that worldwide data center power consumption was 152.5 Billion kWh in 2005. In 2007, the US EPA estimated that servers and data centers, “consumed about 61 billion kilowatt-hours (kWh) in 2006 (1.5 percent of total U.S. electricity consumption) for a total electricity cost of about $4.5 billion. These …
Performance Of Prestressed Concrete Cylinder Pipe (Pccp) In Water Applilcations, Rahul Manda
Performance Of Prestressed Concrete Cylinder Pipe (Pccp) In Water Applilcations, Rahul Manda
Civil Engineering Theses - Archive
The analysis of water pipes failure data is of great importance as it has a significant impact society and the environment. These failures also have the overall impact on the financial burden on the water industry. This thesis evaluates the failure rate of Prestressed Concrete Cylinder Pipe (PCCP), which is one of the most conventional rigid pipes and are extensively used as the water and wastewater pipeline in the US and around the world. A statistical analysis of the failure rate based on the diameter size over multiple years will help in determining the performance of PCCP pipes. Also, the …
Effects Of Fiber Reinforced Polymer (Frp) Wrap On Reducing Chloride Penetration In Concrete, Gunther G. Garcia
Effects Of Fiber Reinforced Polymer (Frp) Wrap On Reducing Chloride Penetration In Concrete, Gunther G. Garcia
Civil Engineering Theses - Archive
The objective of this study was to investigate the effects of FRP wrap on reducing chloride penetration in concrete. It has been established that FRP wrap used to retrofit concrete structures offer a high resistance to chemical solutions. The ACI 318-11 Code allows for a reduction of clear cover depth if an equivalent clear cover depth can be establish. The FRP material used herein consisted of Tyfo SCH-41 and Tyfo SEH-51A composites fabricated from carbon and glass fibers, respectively. The wrapped FRP concrete specimens and control specimens without FRP wrap were tested according to ASTM C 1543 and ASTM C …
Determining The Effectiveness Of Chlorine-Based Biofilm Control On The Friction Factors Of Large Diameter Pipelines In Raw Water, Shelly Stamler Hattan
Determining The Effectiveness Of Chlorine-Based Biofilm Control On The Friction Factors Of Large Diameter Pipelines In Raw Water, Shelly Stamler Hattan
Civil Engineering Theses - Archive
Large diameter transmission mains pumping raw water experience capacity loss during the summer months due to the growth of biofilm. The loss of capacity impacts power costs at a time when power is obtained at a premium. Biofilm growth varies with the seasons and varies along the length of the pipeline. Biofilm growth and decay directly impacts the friction factors. Future design work should consider a seasonal friction factor rather than an aged friction factor over time.The method of controlling biofilm is with the application of chloramines at the lake pump stations. This study compares the difference between little to …
Water Permeability In Fiber Reinforced Plastic (Fpr)-Wrapped Concrete, Jyoti Ojha
Water Permeability In Fiber Reinforced Plastic (Fpr)-Wrapped Concrete, Jyoti Ojha
Civil Engineering Theses - Archive
A finite element analysis is performed using ANSYS software to analyze progress of water and its circulation in FRP wrapped concrete. This paper presents the modeling of water diffusion in FRP. Finite element programs do not usually employ issue permeability or diffusion. Therefore, diffusion of water in FRP is modeled by analogy with thermal conduction. A brief description of theoretical background is presented in the paper. The recommended FE modeling procedures are listed. Diffusion coefficient of Tyfo SCH 41S-1 obtained from an inspection report is used to analyze water permeably of FRP. Tyfo SCH 41S-1 is the most popular FRP …
Resilient Moduli Properties Of Compacted Unsaturated Subgrade Materials, Pinit Ruttanaporamakul
Resilient Moduli Properties Of Compacted Unsaturated Subgrade Materials, Pinit Ruttanaporamakul
Civil Engineering Theses - Archive
According to the new Mechanistic Empirical Pavement Design Guide (MEPDG) and 1993 AASHTO flexible pavement design guide, Resilient Modulus (MR) has been used extensively as an important material property in structure design of pavement. The modulus is used as the primary input parameter to determine the stiffness parameters and constitutive behavior of pavement components. The system of pavement basically consists of the layers of surface, base, subbase (optional), and subgrade. The compacted subgrade soils supporting pavement structure are typically unsaturated with degrees of saturation varying from 75 to 90%. The effect of unsaturated soil behavior on the mechanical properties of …
Productivity Analysis Of Box Jacking, Hossein Tavakoli
Productivity Analysis Of Box Jacking, Hossein Tavakoli
Civil Engineering Theses - Archive
Trenchless Technology (TT) offers methods to install utilities through the ground without damaging the surface. Box Jacking is a trenchless method for installation of prefabricated box and drainage structures without digging a trench. The concept of box jacking is similar to pipe jacking operations by first excavating an entry shaft, building the thrust block and concrete base, and setting jacking equipment. The process starts with pushing boxes while excavating at face, however, the movement of each box is achieved each time excavation at the shield is completed. Additionally, a pilot tube might be required in advance of box jacking operations. …
Assessment And Rating Of Mechanically Stabilized Earth Walls, Noel Janacek
Assessment And Rating Of Mechanically Stabilized Earth Walls, Noel Janacek
Civil Engineering Theses - Archive
Mechanically stabilized earth (MSE) walls have been increasingly utilized in the United States since 1972 and in Texas since 1979. MSE walls provide earth retention for commercial, industrial and transportation projects throughout Texas. Within the transportation industry, the traditional design life of MSE walls is 75 years, with new projects requiring 100 year design life. The millions of square feet of existing MSE walls are generally less than half of the anticipated design life, making identifying and assessing the existing wall inventory a significant asset management component for optimizing maintenance expenditures. This thesis proposes and applies a system that assesses …
Resilient Properties Of Unsaturated Base Materials, Ranjan Kumar Rout
Resilient Properties Of Unsaturated Base Materials, Ranjan Kumar Rout
Civil Engineering Theses - Archive
A pavement system basically consists of a surface layer, a base course, a subbase (optional) and the subgrade. As per MEPDG and 1993 AASHTO flexible pavement design guide Resilient Modulus (MR) is used as the primary input parameter to determine the stiffness parameters and the constitutive behavior of pavement components, such as subgrade and unbound bases. Generally, pavements are constructed on compacted soils that are typically unsaturated with degrees of saturation varying from 75 to 90%. The main focus of this research is to determine the effect of matric suction on the resilient moduli property of the base materials. The …
Design Of Controlled Low Strength Material For Bedding And Backfilling Using High Plasticity Clay, Anil Kumar Raavi
Design Of Controlled Low Strength Material For Bedding And Backfilling Using High Plasticity Clay, Anil Kumar Raavi
Civil Engineering Theses - Archive
Flowable fill or Controlled Low Strength Material (CLSM) is a self-compacted cementitious material used in the field in the place of compacted fill. It is also known as unshrinkable fill, controlled density fill, flowable mortar, plastic-soil cement, soil-cement slurry, and others. The advantages of this material include lesser soil settlements, elimination of compaction, and lower costs when compared to chemically treated and compacted subsoils. CLSMs have a wide range of applications such as using them as a backfill, bedding material, trench filling material, void filling material, bridge abutment and embankment materials and also in pavement bases. Current research is aimed …