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Articles 2731 - 2760 of 3180

Full-Text Articles in Engineering

Analysis And Design Of A Hypersonic Scramjet Engine With A Starting Mach Number Of 4.00, Kristen Nicole Roberts Aug 2008

Analysis And Design Of A Hypersonic Scramjet Engine With A Starting Mach Number Of 4.00, Kristen Nicole Roberts

Mechanical and Aerospace Engineering Theses - Archive

When pressures and temperatures become so high in supersonic flight that it is no longer efficient to slow the oncoming flow to subsonic speeds for combustion, a scramjet (supersonic combustion ramjet) is used in place of a ramjet. Currently, the transition to supersonic combustion generally occurs at a freestream Mach number around 5.0 to 6.0. This research details analysis completed towards extending scramjet operability to lower Mach numbers, while maintaining performance at higher Mach numbers within the same flowpath as detailed in the Air Force solicitation AF073-058. The specific goal is to determine whether the scramjet starting Mach number can …

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Subsurface Investigations Using High Resolution Resistivity, Dharmateja Maganti Aug 2008

Subsurface Investigations Using High Resolution Resistivity, Dharmateja Maganti

Civil Engineering Theses - Archive

Electrical resistivity imaging has been proved to be well suited to produce images of subsurface conditionsbecause of the ability of the technique for detecting resistive features and discriminating subtle resistivity variations in the soil media. Electrical resistivity imaging survey was performed at E. Center Development in Duncanville, Texas. The survey was conducted using SuperSting R8/IP Multi-channel Resistivity Imaging System to image the subsurface structure. Both 2-D and 3-D electrical resistivity imaging tests were conducted using dipole-dipole array at 2 feet, 5 feet and 20 feet electrode spacing. Earth Imager 2D and Earth Imager 3D software's were then used to invert …

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Sealing And Lamination Of Microfluidic Devices, Christopher Ryan Oliver Aug 2008

Sealing And Lamination Of Microfluidic Devices, Christopher Ryan Oliver

Industrial, Manufacturing, and Systems Theses - Archive

A difficult problem facing microfluidic manufacturing of devices remains that often material requirements force device designers to choose materials that are difficult to bond, seal or enclose. Examples of these materials include the Polyolefin family such as HDPE (High Density Polyethylene), PP (Polypropylene) or high performance polymers such as PEEK (Polyetheretherketone), Acetal or Polyimide. The problem arises from the chemical resistance of the materials making them ideal for processing corrosive chemicals but the same property reduces the effectiveness of laminates, surface bonding, surface coatings and solvents. To address this problem a methodology for sealing devices made of these materials is …

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Design Of A Signal Generator Using Current Feedback Operational Amplifiers, Akm Sydul Haque Aug 2008

Design Of A Signal Generator Using Current Feedback Operational Amplifiers, Akm Sydul Haque

Electrical Engineering Dissertations - Archive

Sinusoidal, triangular and rectangular waveforms are generated using current feedback operational amplifiers. A signal generator using a Current Feedback Operational Amplifier (CFOA) was designed, simulated and fabricated. The simulated frequency of oscillation for the sinusoidal wave is 13.13 MHz to 23.94 MHz, for the triangular and the rectangular wave are 6.78 MHz to 59.5 MHz in simulation. The current feedback operational amplifier can achieve higher oscillation frequency than a voltage feedback operational amplifier. Two different types of current feedback operational amplifiers were designed. These are the double buffer current feedback operational amplifier and the double buffer current booster current feedback …

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Sequential Frameworks For Statistics-Based Value Function Representation In Approximate Dynamic Programming, Huiyuan Fan Aug 2008

Sequential Frameworks For Statistics-Based Value Function Representation In Approximate Dynamic Programming, Huiyuan Fan

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Dynamic programming (DP) was derived by Bellman in 1957 as a mathematical programming method to solve multistage decision problems. The DP concept has great potential, but it only can solve small problems exactly under very limiting restrictions such as linear dynamics, quadratic cost, Gaussian random variable, etc. With advances in computational power, a new family of dynamic programming known as approximate dynamic programming (ADP) has emerged. A real-world DP problem is often high-dimensional and stochastic with continuous state variables. To handle this type of problem, ADP methods discretize/sample the continuous state space and approximate the future value (or cost-to-go) function …

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Life Cycle Assessment Of Bio-Material Stabilized Expansive Soils, Ranjith Samuel Rosenberk Aug 2008

Life Cycle Assessment Of Bio-Material Stabilized Expansive Soils, Ranjith Samuel Rosenberk

Civil Engineering Dissertations - Archive

Pavement cracking is one of the major maintenance works that requires millions of dollars in repair costs annually. Pavement cracks are formed due to moisture and temperature fluctuations in the soil. Stabilization of pavement shoulder subsoil with the addition of compost material was studied for preventing pavement cracks. Eight different compost materials with three major feed stock sources such as biosolids, wood waste, and animal manure were investigated in this research. Compost treatment studies were performed at four different test sites located in various regions of the state of Texas. Laboratory experiments were conducted completed compost manufactured topsoil's (CMTs) to …

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Effects Of Calcium-Based Treatment On Organic Soil Behavior, Srujan Rao Chikyala Aug 2008

Effects Of Calcium-Based Treatment On Organic Soil Behavior, Srujan Rao Chikyala

Civil Engineering Theses - Archive

Organic soils are found in many places around the world. Organic soils undergo large secondary settlements depending on the amount of organic matter present in the soil Organic soil is a mixture of finely divided particles of organic matter, in some instances visible fragments of partly decayed vegetable matter and shells are also present in the organic matter. In order to reduce the secondary settlements caused by organic matter, soil is treated with different stabilizing agents. The difficulties associated with organic soils arise when they are treated with cement or lime stabilizers, as organic matter inhibits cementitious reactions responsible for …

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Influence Of Hypoxia, Hypercapnia And Inspiratory Efforts On Sympathoexcitation During Apnea, Vikram Rao Aug 2008

Influence Of Hypoxia, Hypercapnia And Inspiratory Efforts On Sympathoexcitation During Apnea, Vikram Rao

Bioengineering Theses - Archive

Obstructive Sleep Apnea (OSA) is characterized by frequent periods of apnea resulting in hypoxia, hypercapnia and fluctuations of intrathoracic pressure (inspiratory efforts). Hypoxia, hypercapnia and inspiratory efforts lead to stimulation of peripheral chemoreceptors, central chemoreceptors and baroreceptors, respectively, which in turn influence Muscle Sympathetic Nerve Activity (MSNA). We hypothesized that hypoxia and hypercapnia result in an elevated MSNA response, while inspiratory efforts result in a reduced MSNA response during apnea. To test the hypothesis, we determined the contributions of hypoxia (at 12% O2), hypercapnia (at 3% CO2) and inspiratory efforts (mueller maneuvers at 20 mmHg) to MSNA (using microneurographic techniques) …

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A Novel Approach For Mri Image Classification And Image Retrieval, Ankit Vinod Master Aug 2008

A Novel Approach For Mri Image Classification And Image Retrieval, Ankit Vinod Master

Bioengineering Theses - Archive

OBJECTIVE: Classification of MRI image data based on its attribute characteristics is very important for storing the image data and its efficient retrieval. This project aims to find a solution to the problem of classification of the images that are stored on a hard drive and image retrieval from the image database with optimum automation in a user friendly way. METHOD: Matlab was used to create a software tool for image classification and, Java and SQL were used to create a software tool for image retrieval. RESULTS: Image classification tool could read multiple files, extract attribute values from the files …

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Material Flow Control In A Sequence Dependent Job Shop Via Order Release And Dispatching Mechanisms, Francesco Gentile Aug 2008

Material Flow Control In A Sequence Dependent Job Shop Via Order Release And Dispatching Mechanisms, Francesco Gentile

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Material flow control on the shop floor involves the release and dispatching of orders to meet customer due dates, while minimizing operating costs. The early release of orders to the shop floor does not necessarily ensure delivery performance and often results in unnecessary shop congestion and excessive cost. Thus, determining when order release should occur and how dispatching should be accomplished is critical to the success of a manufacturing organization. Although there has been a significant amount of research in the material flow control literature regarding the job shop environment, there exists a significant void with respect to order release …

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Comparison Of Cooling Performance Of Overhead And Underfloor Supply With Rear Door Heat Exchanger In High Density Data Center Clusters, Ravi K. Udakeri Jul 2008

Comparison Of Cooling Performance Of Overhead And Underfloor Supply With Rear Door Heat Exchanger In High Density Data Center Clusters, Ravi K. Udakeri

Mechanical and Aerospace Engineering Theses - Archive

The power trend for server systems continues to grow thereby making thermal management of Data centers a very challenging task. Although various configurations exist, the raised floor plenum with Computer Room Air Conditioners (CRACs) providing cold air is a popular operating strategy. In prior work, numerous data center layouts employing raised floor plenum and the impact of design parameters such as plenum depth, ceiling height, cold isle location, tile openings and others on thermal performance of data center was presented. The air cooling of data center however, may not address the situation where more energy is expended in cooling infrastructure …

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Thermo-Mechanical Solutions In Electronic Packaging: Component To System Level, Aalok Trivedi Jul 2008

Thermo-Mechanical Solutions In Electronic Packaging: Component To System Level, Aalok Trivedi

Mechanical and Aerospace Engineering Theses - Archive

Since the advent of the transistor and integrated circuit, the performance of electronic equipment has increased significantly while footprint of systems at all levels continues to decrease. Recently, the number of transistors on a high end microprocessor has exceeded a billion. All of the above has necessitated considerable improvement in cooling technology and associated reliability. In this era of high heat fluxes, air cooling still remains the primary cooling solution mainly due to its cost and ease of installation and operation. The primary goal of a good thermal design is to ensure that the chip can function at its rated …

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Structural Optimization Using Matlab Partial Differential Equation Toolbox And Radial Basis Function Based Response Surface Model, Faisal Tanveer Mosharrof Jul 2008

Structural Optimization Using Matlab Partial Differential Equation Toolbox And Radial Basis Function Based Response Surface Model, Faisal Tanveer Mosharrof

Mechanical and Aerospace Engineering Theses - Archive

As a decision making tool, optimization has become an inseparable part of the modern design process. However, in spite of the advances in computer capacity and speed, the computational time for some complex problems is too high to use conventional solution approach. In order to reduce the computational effort and the cost associated with such type of problems, approximation methods such as response surface methodology (RSM) along with design of experiments (DOE) are used in engineering design optimization. The main idea involves replacing the expensive simulation model during the design and optimization process with a simplified mathematical approximation of the …

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Design Of Analog Correlator For 22-29ghz Uwb Vehicular Radar Systems In Ibm 90nm Cmos Process, Niranjan Karandikar Jul 2008

Design Of Analog Correlator For 22-29ghz Uwb Vehicular Radar Systems In Ibm 90nm Cmos Process, Niranjan Karandikar

Electrical Engineering Theses - Archive

In this thesis analog correlator is designed for UWB vehicular radar system. Operating frequency of the correlator is 22-29GHz. IBM 90nm CMOS process is used for the design, Simulation are done in CADENCE Spectre and SpectreRF. UWB signal of 22-29GHz is generated in ADS. Gaussian mono-pulse is shaped with band-pass filter to meet FCC mask. Simulations are done by using this signal. Typical receiver of UWB system consists of LNA, analog correlator and ADC. Analog correlator is the matched filter which is a part of receiver. It is used to detect the incoming RF signal by maximizing signal to noise …

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Simulation Of Tetrahedral Mesh Based Organ Deformation Using Parameter Optimized Spring Constants, Koyel Mukherjee Jul 2008

Simulation Of Tetrahedral Mesh Based Organ Deformation Using Parameter Optimized Spring Constants, Koyel Mukherjee

Electrical Engineering Theses - Archive

Virtual reality based surgical simulators are becoming increasingly popular for training doctors on minimally invasive surgery. For these simulators, it is necessary to generate 3D organ models and create virtual environments depicting visually realistic deformation response by tissues and organs to manipulations by surgical tools. For creating a 3D model, several different approaches have been used by the computer graphics community, among which polygonal/polyhedral meshes have gained popularity for real time virtual reality applications. This work investigates two problems in 3D organ modeling for virtual reality simulators. Firstly, we consider the use of unstructured 3D meshes for generation of organ …

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Implementation And Evaluation Of Residual Color Transform For 4:4:4 Rgb Lossless Coding, Pooja Vasant Agawane Jul 2008

Implementation And Evaluation Of Residual Color Transform For 4:4:4 Rgb Lossless Coding, Pooja Vasant Agawane

Electrical Engineering Theses - Archive

The 4:4:4 video sampling format promises an excellent quality video. It is gaining a lot of attention due to its significance in the professional applications of multimedia processing. The use of the RGB color space for video processing is attracting, both, the industry and the academia. Extensive research is being undertaken to achieve better compression efficiency and high coding gain in the RGB (red, green, blue) color space. In contrast to typical consumer applications, high quality video is demanded in areas such as professional digital video recording, video post production and digital cinema. These latter applications demand all three color …

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Diagnosis And Prognosis Of Electrical And Mechanical Faults Using Wireless Sensor Networks And A Two-Stage Neural Network Classifier, Akarsha Ramani Jul 2008

Diagnosis And Prognosis Of Electrical And Mechanical Faults Using Wireless Sensor Networks And A Two-Stage Neural Network Classifier, Akarsha Ramani

Electrical Engineering Theses - Archive

Diagnosis and isolation of electrical and mechanical problems in induction motors has always been a very challenging task. Some of the common problems in induction motors are: bearing, stator winding, and rotor bar failures. This thesis has three phases: The first one pertains to development of low-cost test-beds for simulating bearing faults and short circuit stator winding faults in a motor. Bearing fault is due to the failure of any of the components of the bearing and the stator winding fault is due to the failure of insulation between the windings. Bearing faults can be identified from the motor vibration …

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Theoretical And Experimental Study Of Wide-Band Quasi-Planar Conical Antennas, Tsungyin Wu Jul 2008

Theoretical And Experimental Study Of Wide-Band Quasi-Planar Conical Antennas, Tsungyin Wu

Electrical Engineering Theses - Archive

Conical antennas are widely used in many applications because of their broad input impedance bandwidth and omni-directional radiation pattern. However, conical antennas usually have three-dimensional structures and are, hence, relatively difficult to fabricate and integrate. In this thesis, a quasi-planar conical antenna is proposed, where the simulation and measurement results indicate that dielectric loading could mechanically stabilize the antenna while keeping the input impedance invariant within a broad band. Also, the proposed antenna keeps the original wide-band and omni-directional properties. Specifically, a few configurations of the quasi-planar conical antenna are simulated, fabricated, and tested. The simulation and measurement results show …

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Biodegradable Fluorescent Polymers, Santosh Gautam Jul 2008

Biodegradable Fluorescent Polymers, Santosh Gautam

Bioengineering Theses - Archive

Most of the works done on fluorescent polymers are focused on their potential applications in lighting industries. Much less interest has been paid for their potential application in the field of biology and biomedical engineering. Although multiple biological uses of green fluorescent proteins (GFPs) have been addressed by different groups, their potential for biomedical applications is hampered by their tendency to photobleach rapidly and their short fluorescence lifetime. Quantum dots have emerged as a potential substitute for those applications, but their cytotoxicity and lack of biodegradability restrict their use in a biological system. An ideal fluorescent material that could be …

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Decision And Control In Distributed Cooperative Systems, Prasanna Mohan Ballal Jul 2008

Decision And Control In Distributed Cooperative Systems, Prasanna Mohan Ballal

Electrical Engineering Dissertations - Archive

This dissertation presents novel matrix-based approaches for decision and control in distributed cooperative systems such as wireless sensor networks. A novel matrix-based Discrete Event Controller has been implemented for task planning and resource dispatching in a network consisting of stationary ground sensors and mobile agents also known in the literature as mobile wireless sensor networks. The use of shared resources in such systems can sometimes cause a phenomenon called system deadlock, where all the processes in the system come to a standstill. This work presents a new matrix-based algorithm that has been implemented for deadlock avoidance in a system with …

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Hardware Platform For Research In Helicopter Uav Control, Petru Emanuel Stingu Jul 2008

Hardware Platform For Research In Helicopter Uav Control, Petru Emanuel Stingu

Electrical Engineering Theses - Archive

The topic discussed in this work addresses the current research being conducted at the Automation & Robotics Research Institute in the areas of UAV helicopter instrumentation targeted towards aerobatic flight control and heterogenous multi-vehicle cooperation. A modular electronic control system is designed which includes sensors communicating over a CAN bus and an on-board computer that runs a special real-time Linux kernel. The majority the electronics is developed by the author, including the electronic schematics, PCB design, component soldering and the supporting software. Commercially available modules are used for the radio transceivers or the on-board computer. The same control system is …

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Visible Versus Near-Infrared Light Penetration Depth Analysis In An Intralipid Suspension As It Relates To Clinical Hyperspectral Images, Tinsy John Perumanoor Jul 2008

Visible Versus Near-Infrared Light Penetration Depth Analysis In An Intralipid Suspension As It Relates To Clinical Hyperspectral Images, Tinsy John Perumanoor

Bioengineering Theses - Archive

We determine the penetration depth of near-infrared and visible light in a tissue phantom model using various image processing techniques and chemometrics and use these results to demonstrate the application of a multimodal hyperspectral imaging system for monitoring blood perfusion in amputation wounds. It is capable of performing a noninvasive, in vivo, quantitative analysis of human tissue in a clinical environment, in terms of the percent saturation of oxyhemoglobin. The instrument majorly consists of near-infrared and visible charge coupled devices (CCDs), lenses, liquid crystal tunable filters (LCTFs) for both the CCDs attached to their respective lenses, and a broad band …

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Novel Algorithms For Medium/Low-Voltage Arcing Faults In Switchgear & Motor Coils: From Concept To Realization, Mandhir Singh Sahni Jul 2008

Novel Algorithms For Medium/Low-Voltage Arcing Faults In Switchgear & Motor Coils: From Concept To Realization, Mandhir Singh Sahni

Electrical Engineering Dissertations - Archive

Switchgear arcing faults have been a primary cause for concern for the manufacturing industry and safety personnel alike. The deregulation of the power industry being in full swing and ever-growing competitiveness in the distribution sector calls for the transition from preventive to predictive maintenance. Switchgear forms an integral part of the distribution system in any power system set-up. Keeping in mind the switchgear arcing faults, the transition mentioned above applies most of all to the switchgear industry. Apart from the fact that it is the primary cause of serious injuries to electrical workers worldwide, switchgear arcing faults directly affect the …

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Image Mirroring, Rotation And Interpolation In The Wavelet Domain, Theju Isabelle Jacob Jul 2008

Image Mirroring, Rotation And Interpolation In The Wavelet Domain, Theju Isabelle Jacob

Electrical Engineering Theses - Archive

JPEG2000, the international standard for still image compression, uses the wavelet transform. The filters used in JPEG2000 for transformation are the 9/7 Daubechies filters and the 5/3 Le Gall filters. At present, to achieve image mirroring or rotation for images, one has to convert them back to spatial domain and proceed. This thesis presents methods by which it can be implemented in the wavelet domain, without extra computational complexity. To do so, one manipulates the transform domain coefficients so that the condition of perfect reconstruction still holds true. The thesis also discusses a method to achieve image interpolation, which would …

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Performance Analysis And Effect Of Multi-User Interference For Ultra Wideband Communications, Mukta Athavale Jul 2008

Performance Analysis And Effect Of Multi-User Interference For Ultra Wideband Communications, Mukta Athavale

Electrical Engineering Theses - Archive

Ultra-Wideband (UWB) is an upcoming technology for short-range high data rate applications like Wireless Personal Area Networks or medium/long-range low data rate applications like sensor networks. UWB has many captivating characteristics such as very short duration pulses (order of nanoseconds), multipath channel, large instantaneous bandwidth and time hopping pulse trains resulting in coexistence with the existing narrow band users. The Ultra Wideband communication systems employ the technique of Impulse radio of transmitting short duration pulses which result in extremely wide bandwidth and many performance benefits. Since UWB systems operate in dense multipath environments, RAKE receiver is the optimum choice for …

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Magnetic Drug Targeting: Development Of A Novel Drug Delivery System For Prostate Cancer Therapy, Maham Rahimi Jun 2008

Magnetic Drug Targeting: Development Of A Novel Drug Delivery System For Prostate Cancer Therapy, Maham Rahimi

Bioengineering Dissertations - Archive

Magnetic nanoparticles (MNPs) have been attracting a great amount of attention because of their numerous applications including contrast agents in magnetic resonance imaging (MRI), magnetic targeted drug carriers, and hyperthermia treatments for cancer. However, complications, including aggregation of MNPs, have limited their use in drug delivery applications. To overcome these limitations, several methods have been developed to coat magnetic particles. One method includes coating them with polymers to produce polymer/MNPs for increasing the MNP dispersion and stability. This method also increases the efficiency of loading and releasing drugs to specific locations for the treatment of various diseases including prostate cancer. …

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Tribological And Antiwear Mechanisms Of Fluorinated Zinc Dialkyl Dithiophosphate In Comparison To Zinc Dialkyl Dithiophosphate In Engine Oils, Ramoun Mourhatch May 2008

Tribological And Antiwear Mechanisms Of Fluorinated Zinc Dialkyl Dithiophosphate In Comparison To Zinc Dialkyl Dithiophosphate In Engine Oils, Ramoun Mourhatch

Material Science and Engineering Dissertations - Archive

Tribofilms generated in wear tests using lubricants containing fluorinated ZDDP and ZDDP were studied. Fluorinated ZDDP demonstrated superior wear performance compared to ZDDP under tribological conditions even at lower phosphorus levels. Chemical properties and the molecular structure of the fluorinated ZDDP were examined and presented in a previous companion study by Parekh and Aswath [1] using techniques such as NMR and DSC while this study examines the tribological behavior of this compound and the characteristics of the tribofilms formed by it. Ball on cylinder tribological tests were conducted with lubricants containing this new fluorinated thiophosphate compound and compared to lubricants …

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A Study Of The Antiwear Behavior And Oxidation Stability Of Fluorinated Zinc Dialkyl Dithio Phosphate In The Presence Of Antioxidants, Anuradha Somayaji May 2008

A Study Of The Antiwear Behavior And Oxidation Stability Of Fluorinated Zinc Dialkyl Dithio Phosphate In The Presence Of Antioxidants, Anuradha Somayaji

Material Science and Engineering Dissertations - Archive

The antiwear additive Zinc dialkyl dithio phosphate (ZDDP) is one of the most important components of engine-oil additives and a major source of phosphorus. Phosphorus plays a crucial part in mitigating engine wear, yet has been proven harmful to modern catalytic converters. Progressive regulatory caps on phosphorus content in automotive lubricants have led to widespread efforts to reduce its levels. A new fluorinated ZDDP (F-ZDDP) complex developed at the University of Texas at Arlington has found to breakdown at lower temperatures compared to ZDDP and has showed better wear performance than ZDDP alone. This would allow the possibility of further …

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Trajectory Optimization Using Collocation And Evolutionary Programming For Constrained Nonlinear Dynamical Systems, Brandon Merle Shippey May 2008

Trajectory Optimization Using Collocation And Evolutionary Programming For Constrained Nonlinear Dynamical Systems, Brandon Merle Shippey

Mechanical and Aerospace Engineering Theses - Archive

Trajectory design and optimization has a broad variety of applications in fields such as aerospace and electrical engineering. The solution of a trajectory that minimizes a cost function subject to nonlinear differential equations of motion and various types of constraints may be obtained by the methods of optimal control theory. A framework is presented for numerical solution of the optimal control problem. The solution is converted to that of a constrained discrete parameter optimization problem. Direct collocation and nonlinear programming are used to perform a local gradient-based search for the optimal solution. A genetic algorithm combined with a shooting method …

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Regenerative Peripheral Neurointerfacing Of Upper Extremity Prostheses, Kshitija Garde May 2008

Regenerative Peripheral Neurointerfacing Of Upper Extremity Prostheses, Kshitija Garde

Bioengineering Theses - Archive

Current robotic prosthetic devices provide limited functionality to the user as they rely on gross myogenic control and lack critical sensory feedback needed for fine movement control. Interfacing the nervous system with the robotic prosthesis would facilitate amputees to control them naturally, in resemblance to the human hand. Functional neuro-electrode connections have been demonstrated in the brain and peripheral nervous system; however, gliosis, micro hemorrhages, axonopathy and excessive inflammation limit their long-term use. We evaluated the possibility of enticing peripheral nerve regeneration through a multi-electrode array with an open architecture as an alternative to enhance longevity of nerve-electrode interface. Regenerative …

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