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Articles 2071 - 2100 of 2904

Full-Text Articles in Engineering

Three-Dimensional Multimedium Computational Model For Drug Delivery Using Finite Element Analysis, Eduardo Martinez Jan 2011

Three-Dimensional Multimedium Computational Model For Drug Delivery Using Finite Element Analysis, Eduardo Martinez

Bioengineering Theses - Archive

Approximately 2.8% of trauma patients present peripheral nerve injury, which can result in loss of motor function. Current strategies for peripheral nerve repair had focused on the development of synthetic nerve conduits that provide physical guidance. One advantage of the synthetic nerve conduits is that the conduit can be utilize as a delivery system and gain the ability to deliver neurotrophic factors, which have an effect on controlling the survival, migration, proliferation, and differentiation of different neural cell types. Currently there is no method to quantify the concentration of growth factors in the nerve conduit during the implantation time. In …

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The Equivalence And Generalization Of Optimization Criteria, Surachai Charoensri Jan 2011

The Equivalence And Generalization Of Optimization Criteria, Surachai Charoensri

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

In this dissertation we first show that existing optimization criteria are equivalent to the maximization of a real-valued function in a one-dimensional Euclidean space. The criteria are said to be scalar equivalent. All solutions and only solutions to an optimization problem involving the original criterion can be obtained by scalarization without the typical convexity or concavity assumptions on the original objective functions and feasible region. Examples include Pareto (including the scalar case), satisficing, maximin, and cone-ordered optimization, as well as the more general notion of set-valued optimization in abstract spaces. Moreover, equivalences between various different optimization criteria are also established …

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Models For Evaluation Of Supply Chain Risk With Application To Healthcare Management, Ford Guangfu Zeng Jan 2011

Models For Evaluation Of Supply Chain Risk With Application To Healthcare Management, Ford Guangfu Zeng

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Over the past two decades, supply chain management has come to be a key component of organization competitiveness and effectiveness. In the same period, most organizations have put a great deal of effort into improving their own and their supplier's supply chain performance. To a large extent, much of this effort has been aimed at improving the efficiency of supply chain operations. However, organizations have ignored or played down the risks from supply chain disruptions when developing supply strategies, which focus on cost reduction. It is proposed, therefore, that one such standard measure should measure the risk involved with organizations …

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Mathematical Optimization Techniques For Managing Selective Catalytic Reduction For Coal-Fired Power Plants, Passakorn Phananiramai Jan 2011

Mathematical Optimization Techniques For Managing Selective Catalytic Reduction For Coal-Fired Power Plants, Passakorn Phananiramai

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Coal is one of the most important energy sources in the U.S. However, it is also one of the biggest air polluters where the major emissions generated from coal combustion are oxides of nitrogen (NOx). NOx leads to ozone formation and make people more susceptible to respiratory illness. The US Environmental Protection Agency (EPA) has steadily tightened the regulation for NOx emissions that can be discharged into the atmosphere. Many techniques and technologies can all assist with NOx removal. However, to meet upcoming EPA mandates, more aggressive technique such as Selective Catalytic Reduction (SCR) is highly recommended. SCR is an …

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Estimation Of Dariy Particulate Matter Emission Rates By Lidar And Inverse Modeling, C. C. Marchant, Kori D. Moore, Michael D. Wojcik, Randy S. Martin, R L. Pfeiffer, K H. Prueger, J L. Hatfield Jan 2011

Estimation Of Dariy Particulate Matter Emission Rates By Lidar And Inverse Modeling, C. C. Marchant, Kori D. Moore, Michael D. Wojcik, Randy S. Martin, R L. Pfeiffer, K H. Prueger, J L. Hatfield

Civil and Environmental Engineering Faculty Publications

Particulate matter (PM) emissions from agricultural operations are an important issue for air quality and human health and a topic of interest to government regulators. PM emission rates from a dairy in the San Joaquin Valley of California were investigated during June 2008. The facility had 1,885 total animals, including 950 milking cows housed in free-stall pens with an open-lot exercise area, and 935 dry cows, steers, bulls, and heifers housed in open lots. Point sensors, including filter-based aerodynamic mass samplers and optical particle counters (OPC), were deployed at select points around the facility to measure optical and aerodynamic particulate …

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Bayesian Method For Groundwater Quality Monitoring Network Analysis, K. Ammar, Mac Mckee, Jagath J. Kaluarachchi, H. Moe, M. Almasri, A. Khalil Jan 2011

Bayesian Method For Groundwater Quality Monitoring Network Analysis, K. Ammar, Mac Mckee, Jagath J. Kaluarachchi, H. Moe, M. Almasri, A. Khalil

Civil and Environmental Engineering Faculty Publications

: A new methodology is developed to analyze existing monitoring networks. This methodology incorporates different aspects of monitoring, including vulnerability/probability assessment, environmental health risk, the value of information, and redundancy reduction. A conceptual framework for groundwater quality monitoring is formulated to represent the methodology‚Äôs context. Relevance vector machine RVM plays a basic role in this conceptual framework, and is employed to reduce redundancy and to create probability map of contaminant distribution, and accordingly to estimate the expected value of sample information. Disability adjusted life years approach of the global burden of disease is used for quantifying the health risk consequences. …

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Two-Zone Transient Storage Modeling Using Temperature And Solute Data With Multiobjective Calibration: 1. Temperature, Bethany T. Neilson, S. C. Chapra, David King Stevens, Christina J. Bandaragoda Dec 2010

Two-Zone Transient Storage Modeling Using Temperature And Solute Data With Multiobjective Calibration: 1. Temperature, Bethany T. Neilson, S. C. Chapra, David King Stevens, Christina J. Bandaragoda

Civil and Environmental Engineering Faculty Publications

This paper presents the formulation and calibration of the temperature portion of a two-zone temperature and solute (TZTS) model which separates transient storage into surface (STS) and subsurface transient storage (HTS) zones. The inclusion of temperature required the TZTS model formulation to differ somewhat from past transient storage models in order to accommodate terms associated with heat transfer. These include surface heat fluxes in the main channel (MC) and STS, heat and mass exchange between the STS and MC, heat and mass exchange between the HTS and MC, and heat exchange due to bed and deeper ground conduction. To estimate …

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Two-Zone Transient Storage Modeling Using Temperature And Solute Data With Multi-Objective Calibration: 2. Temperature And Solute, Bethany T. Neilson, David King Stevens, S. C. Chapra, Christina J. Bandaragoda Dec 2010

Two-Zone Transient Storage Modeling Using Temperature And Solute Data With Multi-Objective Calibration: 2. Temperature And Solute, Bethany T. Neilson, David King Stevens, S. C. Chapra, Christina J. Bandaragoda

Civil and Environmental Engineering Faculty Publications

This paper presents the multiobjective calibration results for temperature and solutefrom a two‐zone temperature and solute (TZTS) model which separates transient storageinto surface (STS) and subsurface (HTS) transient storage components. This modelcontains terms associated with surface heat fluxes in the main channel (MC) and STS, heatand mass exchange between the STS and MC, heat and mass exchange between the HTSand MC, and heat exchange due to bed and deeper ground conduction. To estimate theadditional parameters associated with a multiple‐zone model, a data collection effort wasconducted to provide temperature time series and solute tracer curves representingthe movement of heat and/or solute …

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Microstructural Evolution Of Surface Layers During Electrolytic Plasma Processing, Cristian Cionea Dec 2010

Microstructural Evolution Of Surface Layers During Electrolytic Plasma Processing, Cristian Cionea

Material Science and Engineering Dissertations - Archive

Electrolytic Plasma Processing is an emerging technology for surface modification. The EPP process is based on electrolysis of an aqueous electrolyte by application of an electrical potential between the workpiece and counter-electrode, and the production of plasma (micro-arc discharges on the workpiece surface). The plasma micro-arcs provide a heat source for surface modification via localized surface melting and rapid cooling (cleaning process) and, if desirable, enhance ion deposition on a given substrate (coating). Three substrates (low carbon steel, pure Al and pure Ti) were "cleaned" by EPP and their near surface layer microstructure was studied. It was found that the …

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Bubble Template Synthesis Of Hollow Gold Nanoparticles And Their Applications As Theranostic Agents, Chienwen Huang Dec 2010

Bubble Template Synthesis Of Hollow Gold Nanoparticles And Their Applications As Theranostic Agents, Chienwen Huang

Material Science and Engineering Dissertations - Archive

Hollow gold nanoparticle with a sub-30nm polycrystalline shell and a 50 nm hollow core has been successfully synthesized through the reduction of sodium gold sulfite by electrochemically evolved hydrogen. Such hollow gold nanoparticles exhibit unique plasmonic properties. They strongly scatter and absorb near infrared light. In this thesis we seek to understand the formation mechanism of hollow gold nanoparticles in this new synthesis process and their plasmonic properties. Also, we explore their biomedical applications as theranostic agents (therapeutic and diagnostic imaging). A lithographically patterned electrode consisting of Ag stripes on a glass substrate was used to investigate the formation process …

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Study On The Leakage Current Behavior And Conduction Mechanism Of Porous Low-K In Cu/Porous Low-K Interconnects: The Influence Of Extrinsic Factors, Liangshan Chen Dec 2010

Study On The Leakage Current Behavior And Conduction Mechanism Of Porous Low-K In Cu/Porous Low-K Interconnects: The Influence Of Extrinsic Factors, Liangshan Chen

Material Science and Engineering Dissertations - Archive

This study investigates the influence of extrinsic factors including moisture and impurities trapped in porous low-k (PLK) and defective diffusion barrier on the leakage current behavior and the associated conduction mechanism of PLK in advanced Cu/PLK interconnects. For this purpose, a voltammetry technique that was previously developed for diffusion barrier characterization was extended to detect the trapped impurities in PLK. With this technique in hand, the influence of extrinsic factors was then studied. Cu was found to diffuse out into PLK through barrier defects in the presence of electric stress. Its out-diffusion and subsequent migration in PLK manifested as a …

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Nanocrystalline Piezoresistive Polysilicon Film Obtained By Aluminum Induced Crystallization For Pressure Sensing Applications, Suraj Kumar Patil Dec 2010

Nanocrystalline Piezoresistive Polysilicon Film Obtained By Aluminum Induced Crystallization For Pressure Sensing Applications, Suraj Kumar Patil

Material Science and Engineering Dissertations - Archive

The overall objective of our research was to integrate various sensors on to a single flexible substrate for multi-sensory information gathering. Additional capabilities could be incorporated towards the realization of 'smart skin' for simultaneous and real time sensing of various mechanical, biological and chemical stimuli. Recent research venues are dictated by the trend of shifting from conventional silicon (Si) substrates to lower weight, low profile, structurally robust and lower cost flexible substrates. These flexible substrates easily conform to non-planar objects, could be batch fabricated at lower cost and enable multilayer construction. This would eventually evolve into seamless assimilation of sensors …

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Quantification Of Functional Near Infrared Spectroscopy To Assess Cortical Reorganization In Children With Cerebral Palsy, Fenghua Tian, Mauricio R. Delgado, Bilal Khan, Sameer C. Dhamne, George Alexandrakis, Mario I. Romero, Linsley Smith, Dahlia Reid, Hanli Liu, Nancy J. Clegg Nov 2010

Quantification Of Functional Near Infrared Spectroscopy To Assess Cortical Reorganization In Children With Cerebral Palsy, Fenghua Tian, Mauricio R. Delgado, Bilal Khan, Sameer C. Dhamne, George Alexandrakis, Mario I. Romero, Linsley Smith, Dahlia Reid, Hanli Liu, Nancy J. Clegg

Bioengineering Faculty Publications - Archive

No abstract provided.

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Po2 Dependant Resistance Switch Effect In Highly Epitaxial (Laba)Co2o5+[Delta] Thin Films, Jian Liu, Gregory Collins, Ming Liu, C L. Chen, Jiechao Jiang, Efsftathios Meletis, Qingyu Zhang, Chuang Dong Sep 2010

Po2 Dependant Resistance Switch Effect In Highly Epitaxial (Laba)Co2o5+[Delta] Thin Films, Jian Liu, Gregory Collins, Ming Liu, C L. Chen, Jiechao Jiang, Efsftathios Meletis, Qingyu Zhang, Chuang Dong

Material Science and Engineering Faculty Publications - Archive

Giant resistance switching behavior in mixed conductive LaBaCo2O5+ epitaxial thin film were discovered in high temperature and reducing environments during the reduction and reoxidation process. A reproducible resistance response of over 99% was achieved in the films during a change of 4% H2 /96% N2 to oxygen at temperature range of 400– 780 °C. The results indicate that at, low oxygen partial pressure, the extension of oxygen deficiency is an essential factor to the high temperature physical properties of LaBaCo2O5+ and demonstrates its potential application as a chemical sensor device for reducing environments at high temperature. © 2010 American Institute …

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Groundwater Stress And Vulnerability In Rural Coastal Aquifers Of The Kalpitiya Peninsula, Sri Lanka, D. Jayasekera, Jagath J. Kaluarachchi, K. Villholth Jun 2010

Groundwater Stress And Vulnerability In Rural Coastal Aquifers Of The Kalpitiya Peninsula, Sri Lanka, D. Jayasekera, Jagath J. Kaluarachchi, K. Villholth

Civil and Environmental Engineering Faculty Publications

Rural coastal aquifers are undergoing rapid changes due to increasing population, high water demand with expanding agricultural and domestic uses, and seawater intrusion due to unmanaged water pumping. The combined impact of these activities is the deterioration of groundwater quality, public health concerns, and unsustainable water demands. The Kalpitiya peninsula located northwest of Sri Lanka is one area undergoing such changes. This land area is limited and surrounded almost completely by sea and lagoon. This study consists of groundwater sampling and analysis, and vulnerability assessment using the DRASTIC method. The results reveal that the peninsula is experiencing multiple threats due …

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Forecast For The Future: Emerging Legal Technologies, Carol A. Watson Mar 2010

Forecast For The Future: Emerging Legal Technologies, Carol A. Watson

Continuing Legal Education Presentations

Begins by discussing technologies that are currently available on the web that can reduce office overhead. Also highlights current general technology trends and still-developing technologies. Concludes with a list of frivolous gadgets to provide food for thought about the coming prospects of technology.

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Bdf-Like Methods For Nonlinear Dynamic Analysis, S. Dong Jan 2010

Bdf-Like Methods For Nonlinear Dynamic Analysis, S. Dong

PRISM: NNSA Center for Prediction of Reliability, Integrity and Survivability of Microsystems

We present several time integration algorithms of second-order accuracy that are numerically simple and effective for nonlinear elastodynamic problems. These algorithms are based on a general four-step scheme that has a resemblance to the backward differentiation formulas. We also present an extension to the composite strategy of the Bathe method. Appropriate values for the algorithmic parameters are determined based on considerations of stability and dissipativity, and less dissipative members of each algorithm have been identified. We demonstrate the convergence characteristics of the proposed algorithms with a nonlinear dynamic problem having analytic solutions, and test these algorithms with several three-dimensional nonlinear …

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A Study Of Diamond Nanoparticles, Rajarshi Chakraborty Jan 2010

A Study Of Diamond Nanoparticles, Rajarshi Chakraborty

Material Science and Engineering Theses - Archive

Diamond nanoparticles grown previously by Hot Filament Assisted Chemical Vapor Deposition have been characterized by utilizing Atomic Force Microscopy, Scanning Electron Microscopy, Raman Spectroscopy and X Ray Diffraction. AFM and SEM data shows increase in nanoparticle size with growth period ranging from about 20 nm for 15 minutes to 200 nm for 105 minutes growth. Raman spectra have been analyzed by using optical phonon confinement in nanometer size crystals. Based on the SEM, Raman spectroscopy and XRD data, we present clear evidence for nanometer size (10-200 nm) diamond particles in CVD-grown diamond thin films.

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Aircraft Conceptual Design - An Adaptable Parametric Sizing Methodology, Gary John Coleman Jan 2010

Aircraft Conceptual Design - An Adaptable Parametric Sizing Methodology, Gary John Coleman

Mechanical and Aerospace Engineering Dissertations - Archive

Aerospace is a maturing industry with successful and refined baselines which work well for traditional baseline missions, markets and technologies. However, when new markets (space tourism) or new constrains (environmental) or new technologies (composite, natural laminar flow) emerge, the conventional solution is not necessarily best for the new situation. Which begs the question "how does a design team quickly screen and compare novel solutions to conventional solutions for new aerospace challenges?" The answer is rapid and flexible conceptual design Parametric Sizing. In the product design life-cycle, parametric sizing is the first step in screening the total vehicle in terms of …

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Constrained Dynamics Approach For Motion Synchronization And Consensus, Divya Bhatia Jan 2010

Constrained Dynamics Approach For Motion Synchronization And Consensus, Divya Bhatia

Mechanical and Aerospace Engineering Theses - Archive

In this research we propose to develop constrained dynamical systems based stable attitude synchronization, consensus and tracking (SCT) control laws for the formation of rigid bodies. The generalized constrained dynamics Equations of Motion (EOM) are developed utilizing constraint potential energy functions that enforce communication constraints. Euler-Lagrange equations are employed to develop the non-linear constrained dynamics of multiple vehicle systems. The constraint potential energy is synthesized based on a graph theoretic formulation of the vehicle-vehicle communication. Constraint stabilization is achieved via Baumgarte's method. The performance of these constrained dynamics based formations is evaluated for bounded control authority.The above method has been …

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Ideal Cycle Analysis Of A Regenerative Pulse Detonation Engine For Power Production, Rafaela Bellini Jan 2010

Ideal Cycle Analysis Of A Regenerative Pulse Detonation Engine For Power Production, Rafaela Bellini

Mechanical and Aerospace Engineering Dissertations - Archive

Over the last few decades, considerable research has been focused on pulse detonation engines (PDEs) as a promising replacement for existing propulsion systems with potential applications in aircraft ranging from the subsonic to the lower hypersonic regimes. On the other hand, very little attention has been given to applying detonation for electric power production. One method for assessing the performance of a PDE is through thermodynamic cycle analysis. Earlier works have adopted a thermodynamic cycle for the PDE that was based on the assumption that the detonation process could be approximated by a constant volume process, called the Humphrey cycle. …

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Stress Analysis Of Laminated Composite Beam With I-Section, Jitesh Cherukkadu Parambil Jan 2010

Stress Analysis Of Laminated Composite Beam With I-Section, Jitesh Cherukkadu Parambil

Mechanical and Aerospace Engineering Theses - Archive

The advantage of material properties and flexibility of choosing material have made composite materials a primary preference for structural application. Unlike isotropic materials, the parametric study of composite beams for optimized design is complicated due to high number of parameters involved in designing like lay-up sequence, and layer configuration. Moreover, the limitations of FEA techniques in designing have created a need for an analytical closed-form solution for stress analysis of laminated composite beams. The objective of this study focuses on the development of an analytical method for stress analysis of composite I-beam. This method includes the structural response due to …

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Development Of Amphiphilic Biodegradable Photoluminescent Polymers, Shengyuan Zhou Jan 2010

Development Of Amphiphilic Biodegradable Photoluminescent Polymers, Shengyuan Zhou

Material Science and Engineering Theses - Archive

The development of amphiphilc block copolymers have been attracted much attention due to their potential use in drug delivery and targeting. Less research work focused on their prospective application as fluorescent imaging probes. Although some research reported fluorescent materials encapsulated in amphiphilc micelles has provided significant opportunities for biological labeling and imaging in biomedical fields, these fluorescent materials, such as organic dyes and quantum dots, suffer from photobleaching, cytotoxicity and lack of biodegradability. A novel and ideal amphiphilic biodegradable photoluminescent polymeric micelle was developed, which will open new avenues for biomedical filed. The objective of this reseach was to develop …

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Synthesis And Characterization Of Platinum And Carbon Nanoparticle In Benzene By Electric Plasma Discharge In Ultrasonic Cavitation, Rakesh Pratapbhai Chaudhary Jan 2010

Synthesis And Characterization Of Platinum And Carbon Nanoparticle In Benzene By Electric Plasma Discharge In Ultrasonic Cavitation, Rakesh Pratapbhai Chaudhary

Material Science and Engineering Theses - Archive

Nanoparticles are of interest due to the high number of atoms located on the surface. This high surface area is conductive to higher catalytic efficiency than normal seen in bulk metals. Of numerous Nanoparticles catalysts studied, Platinum (Pt) nanoparticles have attracted particular interest due to their superior catalysis for many chemical reactions, especially for fuel cell reactions including hydrogen oxidation and oxygen reduction. Carbon supported Pt nanoparticles are active anode catalysts for fuel cells. In this thesis nano-sized Pt particles have been synthesized by an advanced and cost effective method. Pt nanoparticles embedded in carbon matrix were synthesized by an …

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Solution To Multi Term Boltzmann Equation For Plasma Assisted Combustion, Antriksh Luthra Jan 2010

Solution To Multi Term Boltzmann Equation For Plasma Assisted Combustion, Antriksh Luthra

Mechanical and Aerospace Engineering Theses - Archive

Plasma assisted ignition and combustion (PAIC) is a technology where plasma is generated by high voltage, nano second pulse duration and high repetitive rate pulses. The high reduced electric field during the pulse allows efficient electronic excitation and molecular dissociation, thereby generating a pool of chemically active radical species. This speeds up the reaction process needed to generate a high speed flame a very high energy is liberated though the mode of excited electrons to the neutral molecules of the fuel in such a way that the energy sent should not go in momentum transfer but it should be so …

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Nanoparticle Bridge Dna Biosensor, Hong-Wen Huang Jan 2010

Nanoparticle Bridge Dna Biosensor, Hong-Wen Huang

Material Science and Engineering Dissertations - Archive

A new DNA sensing method is demonstrated in which DNA hybridization events lead to the formation of nanoparticle satellites that bridge two electrodes and are detected electrically. The hybridization events are exclusively carried out only on specific locations, the surfaces of C-ssDNA modified 50 nm GNPs. The uniqueness of this work is that only a small number of T-ccDNA molecules (<10) is required to form the nanoparticle satellites, allowing ultra-sensitive DNA sensing. The principle of this new DNA sensing technique has been demonstrated using target DNA and three-base-pair-mismatched DNA in 20nM concentrations. Three single-stranded DNA (ssDNA) system is used in our experiment which includes Capture-ssDNA (C-ssDNA), Target-ssDNA (T-ssDNA) and Probe-ssDNA (P-ssDNA). Both C-ssDNA and P-ssDNA are modified by a thiol group and can hybridize with different portions of T-ssDNA. T-ssDNA requires no modification in three ssDNA system, which is beneficial in many applications. C-ssDNA modified 50nm gold nanoparticle (C-50au) and P-ssDNA modified 30nm gold nanoparticle (P-30au) are prepared through the reaction of thiol-gold chemical bonding between thiolated ssDNA and gold nanoparticle (GNP) (C-ssDNA with 50nm GNP, P-ssDNA with 30nm GNP). We controllably place the C-50au only on the SiO2 band surface (~ 90nm width) between two gold electrodes (source and drain electrodes) by forming positively- and negatively-charged self-assembled monolayers (SAMs) on SiO2 and gold surface, respectively. DNA modified GNP is negatively charged due to ionization of phosphate group on DNA back bone. C-50au therefore is negatively charged and can only be attracted toward SiO2 area (repelled by negatively charged gold electrode surface). The amine group of positively-charged SAMs on SiO2 surface is then passivated by converting to non-polar methyl functional group after C-50au placement. P-30au is first hybridized with T-ssDNA in the solution phase (T-P-30au formed) and is introduced into DNA detection device in which C-50au are immobilized on ~90nm width SiO2 band (between two gold electrodes). The passivation step ensures every T-P-30au are attached only to C-50au through hybridization (T-P-30au will not be attracted toward SiO2 surface or gold electrodes). GNP bridges are formed across the electrodes and provide an electrical path between two gold electrodes.We ensure that every T-P-30au only hybridizes on the surface of C-50au by (1) accurately controlling C-50au placement between two gold electrodes, (2) passivating positively-charged SAMs on SiO2 surface after C-50au immobilization. When T-P-30au hybridize with C-50au on ~90nm wide SiO2 surface, GNP bridges form and provide an electrical path between two gold electrodes even with only a few hybridization events. Experimental results show that even a few GNP bridges formed on SiO2 band can provide a significant conductance change from an open circuit to a conductive circuit (current = 0.5 uA at voltage = 0.1 V with four GNP bridge). We also used 3-base-pair-mismatched ssDNA (3mm-ssDNA) as a control experiment, which always resulted in an open circuit (no GNP bridge formed). Our detection device is compatible with current CMOS fabrication technology and can be manufactured on a wafer scale. The direct electrical output of this DNA detection technique provides a promising basis for high-throughput screening (can be fabricated on a wafer scale) with no expensive equipment required.

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Measurement Of The Spectral Distribution Of Low Energy Electrons Emitted As A Result Of Nvv Auger Transitions In Ag (100), Sushant Kalaskar Jan 2010

Measurement Of The Spectral Distribution Of Low Energy Electrons Emitted As A Result Of Nvv Auger Transitions In Ag (100), Sushant Kalaskar

Material Science and Engineering Theses - Archive

Auger Photoelectron Coincidence Spectroscopy (APECS) was used to investigate the physics of the Low Energy Tail (LET) of the Auger spectrum of Ag (100) at the National Synchrotron Light Source, Brookhaven National Lab, New York. The incident photon energy was set at 180eV. The spectrum shows a peak due to the NVV Auger transition accompanied by a substantial low energy region. The APECS spectrum contains the contributions from electrons excited by the NVV Auger transition plus a background due to true coincidences between photoemitted valence band electrons that undergo inelastic scattering and transfer part of their energy with other valence …

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Kinematic Analysis Of A Quadruped Robot Capable Of Working As A Machining Tool, Raghu Mandayam Anand Jan 2010

Kinematic Analysis Of A Quadruped Robot Capable Of Working As A Machining Tool, Raghu Mandayam Anand

Mechanical and Aerospace Engineering Theses - Archive

Parallel robots have been proposed for some time now due to their potential advantages over serial robots in high load bearing, acceleration, stiffness and with lower moving mass. Mobile parallel configurations, i.e. multi-legged walking vehicles have been and are the focus of a great deal of current research. This thesis attempts to provide insights into the kinematic analysis of a quadruped robot capable of both walking and more importantly functioning as a machining tool. The gait analysis of quadruped robots has been extensively investigated and is not the focus of this research; however the gait ability is considered in the …

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Effects Of Freezing On The Mechanical Properties Of Engineered Tissues, Lacey Mlcak Jan 2010

Effects Of Freezing On The Mechanical Properties Of Engineered Tissues, Lacey Mlcak

Mechanical and Aerospace Engineering Theses - Archive

Cryopreservation is used to preserve cells and tissues at low temperatures for short and long term uses. Some examples of where cryopreservation is used include the storage of organs, blood, embryos, and artificial tissues. A current challenge of cryopreservation is being able to understand and quantify the effects of freezing/thawing on the functional properties of tissues such as mechanical properties. This study investigated the changes in viscoelastic parameters of engineered tissues before and after freezing by performing creep-relaxation tests using a dynamic mechanical analyzer. Three types of engineered tissues were studied with varying cell and collagen concentrations for two different …

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Experimental Study Of The Effects Of Thermally Conductive Microporous Coatings On Low Heat Flux Pool And Flow Boiling, Matthew Mlcak Jan 2010

Experimental Study Of The Effects Of Thermally Conductive Microporous Coatings On Low Heat Flux Pool And Flow Boiling, Matthew Mlcak

Mechanical and Aerospace Engineering Theses - Archive

This study examines the effect of the Thermally Conductive Micro-porous Coating (TCMC) developed at the University of Texas at Arlington, on an extended length heater in flow boiling. The study was performed with application to heat transfer in a tankless hot water heater in mind. The coating is composed of copper particles of micron size soldered to each other and to the substrate. The optimal TCMC (75µm particles with a thickness of 425µm±25µm) was first determined from pool boiling tests. The coating was then tested in flow boiling utilizing tap water as the working fluid at two different levels of …

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