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Articles 7351 - 7380 of 8682
Full-Text Articles in Entire DC Network
Imbalance Response Of A Four Degree Of Freedom Rigid Rotor Supported By Hybrid Three Pad Air Foil Bearing, Prajwal Krishna Shetty
Imbalance Response Of A Four Degree Of Freedom Rigid Rotor Supported By Hybrid Three Pad Air Foil Bearing, Prajwal Krishna Shetty
Mechanical and Aerospace Engineering Theses - Archive
Air foil bearings (AFB's) are widely used in small to midsized turbomachinery. They provide safer, cleaner and cheaper bearing operation. They are simple in construction, offer very low drag friction and have very high reliability at high speed operations. A major advantage of air foil bearings compared to conventional rigid surface bearings is their superior dynamic performance in rotor bearing systems. Since there is no contact between the rotor and bearing surface, the air foil bearings have a higher service life compared to rigid surface bearings. Hybrid AFB's operate under both hydrodynamic and hydrostatic condition. The present study is a …
Evaluation Of Trenchless Renewal Methods For Potable Water Distribution Pipes, Abhay A. Jain
Evaluation Of Trenchless Renewal Methods For Potable Water Distribution Pipes, Abhay A. Jain
Civil Engineering Theses - Archive
Undoubtedly, potable water pipes, as part of an underground infrastructure system, play a key role in maintaining quality of life, health and well being of human kind. As these potable water pipes reach the end of their useful life, they create high maintenance costs, loss of flow capacity, decreased water quality, and increased dissatisfaction. Trenchless renewal methods (TRMs) are a medium to renew deteriorated potable water pipes, thus decreasing leakage loss, emergency maintenance costs and customer complaints. TRMs also maintain the quality of the water leaving the treatment plant. America's drinking water systems faces an annual shortfall of at least …
An Investigation Of Productivity Loss Due To Outdoor Noise Conditions, Shripad Dilip Maldikar
An Investigation Of Productivity Loss Due To Outdoor Noise Conditions, Shripad Dilip Maldikar
Civil Engineering Theses - Archive
Most people in day to day life at one time or other get irritated or distracted by surrounding noises. The irritation might have resulted in minor aggravation or may have been dramatic enough to hinder their work. This leads us to think whether there are any losses in the efficiency of construction workers due to surrounding varying noise conditions, or if they naturally adjust to their acoustic environment. In an effort to answer this question, this study on productivity loss due to varying sound conditions was conducted. It was found that, the efficiency of laborers was inversely proportional to the …
A Study On The Corrosion Behavior Of Nanocrystalline Nickel In Aqueous Environments, Anjana Shyam Sundar
A Study On The Corrosion Behavior Of Nanocrystalline Nickel In Aqueous Environments, Anjana Shyam Sundar
Material Science and Engineering Theses - Archive
Nanocrystalline materials possess considerably enhanced properties arising from their small grain size. Significant interest has been paid in the past to their mechanical and physical properties. Very little attention has been attracted by their electrochemical behavior, which is expected to be affected by the significant volume fraction of grain boundaries. In the present study, corrosion experiments were conducted in nanocrystalline nickel in two entirely different solutions in order to obtain a better understanding of its corrosion behavior. This is of particular interest to MEMS and NEMS devices where electroplated nanocrystalline nickel is the metal of choice. The corrosion behavior of …
Performance-Based Plastic Design Of Earthquake Resistant Steel Structures: Concentrically Braced Frames, Tall Moment Frames, Plate Shear Wall Frames, Mohammad Reza Bayat
Performance-Based Plastic Design Of Earthquake Resistant Steel Structures: Concentrically Braced Frames, Tall Moment Frames, Plate Shear Wall Frames, Mohammad Reza Bayat
Civil Engineering Dissertations - Archive
It is well known that structures designed by current codes experience large inelastic deformations during major earthquakes. However, current seismic design practice in the U.S. is based on elastic structural behavior and accounts for inelastic behavior only in an indirect manner through certain modification factors such as R, I, and Cd. Under moderate to severe earthquakes, inelastic activity, including severe yielding and buckling of structural members can be unevenly distributed in the structure which may result in global collapse or costly repair work. Recently, a new design method has been developed and referred to as Performance-Based Plastic Design (PBPD). This …
Evaluation Of Project Delivery Methods For Trenchless Construction, Sahar W. Hasan
Evaluation Of Project Delivery Methods For Trenchless Construction, Sahar W. Hasan
Civil Engineering Theses - Archive
The need of today's construction whether it be residential, commercial or infrastructure is to cut costs while maintaining schedule, scope, and delivering the expected quality. This realization has brought to light the importance of project delivery methods. Project delivery methods are no longer seen only as procedures to follow for a construction project; they have become instruments that are being used to save money, deliver projects ahead of schedule and come up with innovative design solutions by utilizing the contractor's expertise. This thesis evaluates the pros and cons of project delivery methods with respect to trenchless construction. Trenchless technology methods …
Time Depedent Queuing Models Of The National Airspace, Chatabush Roongrat
Time Depedent Queuing Models Of The National Airspace, Chatabush Roongrat
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Air transportation in the US system has dramatically changed in the past few decades. The National Airspace System (NAS) has increasingly become congested. A high volume of air traffic demand is one of the major challenges of the NAS. However, air traffic is very difficult to study due to many uncertainties involved. It is important that we be able to understand the relationship under uncertainties due to aviation operations, precision of navigation and control, and traffic flow efficiency. Many queuing models have been studied to better understand and quantify these relationships. In the past decade, most queuing network models assume …
Synthesis And Characterization Of Ferromagnetic Nanowires, Poching Tsai
Synthesis And Characterization Of Ferromagnetic Nanowires, Poching Tsai
Material Science and Engineering Theses - Archive
Ferromagnetic nanocrystals with shape anisotropy have drawn great attention in the past decades because of their unique magnetic properties and for their potential applications in ultra-high-density magnetic recording media, exchange-coupled nanocomposite magnets and related nanodevices. In this thesis, synthesis and characterixation of ferromagnetic CoNi and CoFe nanowires are reported. CoNi nanocrystals with different size, shape and composition were successfully synthesized via a catalyst chemical solution method. It was found out that the structure and morphology can be controlled by altering the NaOH concentration, and the elongation of the nanowires can be adjusted by changing surfactants ratio and catalyst amount. Unlike …
Solid-State Tunneling Spectroscopy Of Individual Quantum Dots, Ramkumar Subramanian
Solid-State Tunneling Spectroscopy Of Individual Quantum Dots, Ramkumar Subramanian
Material Science and Engineering Dissertations - Archive
Quantum dots are gaining importance for their potential applications in the fields of energy harvesting, bio-labeling and treatment, in opto-electronic devices and in photonic devices. For all these applications, it is imperative to know their electronic structure. Although currently several spectroscopic techniques exist to study the electronic structure of these quantum dots, they are accompanied by other effects and do not give purely the electronic structure of the individual quantum dot. The main goals of this research are to:o To study the energy level structure of `single' quantum dots.o Develop a new spectroscopic technique that allows the measurement of the …
Transmission Electron Microscopy Studies Of Lamno₃ And La₁₋Xsrxmno₃Thin Films Grown On Various Substrates, Yinsheng Fang
Transmission Electron Microscopy Studies Of Lamno₃ And La₁₋Xsrxmno₃Thin Films Grown On Various Substrates, Yinsheng Fang
Material Science and Engineering Theses - Archive
LaMnO₃ (LMO) and La₁₋xSrxMnO₃ (LSMO) thin films with colossal magnetoresistance have attracted considerable interest for potential applications in many technological devices, such as magnetic sensors and read-head of computer memory. In this work, polycrystalline and epitaxial LMO and LSMO thin films were deposited on various substrates including (001) Si, (001) MgO, and (001) LaAlO₃ (LAO) using RF magnetron sputtering. The microstructures of the thin films were initially studied using X-ray diffraction. Detailed microstructure information such as crystallite of the films, grain size, epitaxial quality, crystallographic structure and film/substrate interface were studied using high-resolution transmission electron microscope (HRTEM). More specifically, Effects …
Incorporation Of Vascular Endothelial Growth Factor And Pleiotrophin Into A Multiluminal Biosynthetic Nerve Implant For The Repair Of Peripheral Nerve Long Gap Defects, An Hai Nguyen
Bioengineering Theses - Archive
To repair a fully transected nerve without putting undue tension on the nerve stumps, and too circumvent many of the obvious problems of using harvested nerve grafts synthetic nerve guides have been used in the clinical setting. Thus far this strategy has met with minimal success for the repair of short defects (i.e. 1 - 2.5 cm) while any defect larger than 3 cm have failed. We hypothesize that neurotorphic support, early vascularization, and contact guidance are needed to successfully regenerate a nerve across a long-gap defect. To this end we proposed a biosynthetic nerve implant (BNI) with a multiluminal …
Synthesis And Evaluation Of Bioceramics For Orthopedics And Tissue Culture Applications, Hande Demirkiran
Synthesis And Evaluation Of Bioceramics For Orthopedics And Tissue Culture Applications, Hande Demirkiran
Material Science and Engineering Dissertations - Archive
Hydroxyapatite is the most well known phosphate in the biologically active phosphate ceramic family by virtue of its similarity to natural bone mineral. Among all bioglass compositions Bioglass®45S5 is one of the most bioactive glasses. This study initially started by adding different amounts (1, 2.5, 5, 10, and 25 wt. %) of Bioglass®45S5 to synthetic hydroxyapatite in order to improve the bioactivity of these bioceramics.The chemistries formed by sintering and their effect on different material properties including bioactivity were identified by using various techniques, such as powder and thin film x-ray diffraction, scanning electron microscopy coupled with energy dispersive X-ray …
Tribological Performance Of Ashless Antiwear Additives Under Extreme Pressure Conditions, Bohoon Kim
Tribological Performance Of Ashless Antiwear Additives Under Extreme Pressure Conditions, Bohoon Kim
Material Science and Engineering Dissertations - Archive
Zinc diakyl dithiophosphate (ZDDP) has been used in engine oil for several decades as an antiwear additive. However, ZDDP is the primary source of P, S and Zn in the exhaust, which results in frequent maintenance or replacement of exhaust gas treatment systems. The use of ashless additives is more desirable because of recent environmental regulations. The main goal of this research was to develop a fundamental understanding of how ashless compounds protect the tribological surface in comparison to ZDDP. X-ray absorption near edge structure spectroscopy (XANES) has been performed on tribo and thermal films in order to investigate the …
Self Powered Sensing By Combining Novel Sensor Architectures With Energy Harvesting, Vishwas Bedekar
Self Powered Sensing By Combining Novel Sensor Architectures With Energy Harvesting, Vishwas Bedekar
Material Science and Engineering Dissertations - Archive
Recent advancements in the field of wireless sensor networks have resulted in increasing demand for self-powering techniques that reduces the dependence on batteries. In order to address this problem, there has been significant effort on generating small electrical power locally by harvesting energy from freely available environmental sources such as mechanical vibrations, wind, and stray magnetic field. Further, there is need for inventing new sensing techniques to reduce the overall power consumption. The road for reaching the destination of self-powered sensor networks requires cooperative progress in reduction in sensor power consumption by developing new sensing mechanisms and local generation of …
Friends Of The Library Mcnair Scholarship Awards, The Mcnair Team
Friends Of The Library Mcnair Scholarship Awards, The Mcnair Team
McNair Scholars Research Journal
No abstract provided.
Solar Shroud Design In A Cfd Environment, Keduse Agonafer
Solar Shroud Design In A Cfd Environment, Keduse Agonafer
McNair Scholars Research Journal
No abstract provided.
Mentor Profile, The Mcnair Team
Mentor Profile, The Mcnair Team
McNair Scholars Research Journal
No abstract provided.
Full Issue, The Mcnair Team
Acknowledgements, The Mcnair Team
Acknowledgements, The Mcnair Team
McNair Scholars Research Journal
No abstract provided.
Synthesis, Characterization And Potential Applications Of Fept Nanoparticles, Vikas Nandwana
Synthesis, Characterization And Potential Applications Of Fept Nanoparticles, Vikas Nandwana
Material Science and Engineering Dissertations - Archive
Monodisperse FePt nanoparticles with controlled size and geometry have drawn great attention in the last decade for fundamental scientific studies and for their potential applications in advanced materials and devices such as ultra-high-density magnetic recording media, exchange-coupled nanocomposite magnets, biomedicines and nanodevices. This dissertation focuses on the synthesis and characterization of FePt nanoparticles and their use in potential applications. The FePt nanoparticles of different size (2 to 16 nm) and shape (spherical, cubic, rod) were synthesized by a chemical solution method. The size and shape of these particles were controlled by adjusting reaction parameters. The as-synthesized FePt nanoparticles have chemically …
Developing Eligibility Criteria For Daylighting Streams As Applied To Dallas' Mill Creek, Deepa Harkishore Koshaley
Developing Eligibility Criteria For Daylighting Streams As Applied To Dallas' Mill Creek, Deepa Harkishore Koshaley
Landscape Architecture Masters & Design Theses - Archive
Daylighting is a deliberate act of exposing the full or partial flow of previously buried rivers, creeks and streams into restored surface waterways. Human development has encroached upon natural streams and confined them in concrete channels and pipes, covered them partially or fully, and altered their natural courses. Eventually this has caused reductions in flow capacity, increase in flow velocity, and water pollution, leading to floods, erosion, and loss of natural resources. Stream daylighting is in a developmental phase, meaning that most of the daylighting projects have been undertaken without proper hydrological, geomorphological, and ecological assessment or knowledge of the …
Ecological Design In Resort Hotel Properties: Management Perceptions Of Ecologically Performative Landscape Practices, Kristen Leigh Mitrakis
Ecological Design In Resort Hotel Properties: Management Perceptions Of Ecologically Performative Landscape Practices, Kristen Leigh Mitrakis
Landscape Architecture Masters & Design Theses - Archive
It has been argued that in order to bring about society's acceptance of sustainable landscape practices, landscape architects must make them transparent; that is, visible, and ultimately understandable, to the observer. Only when the members of society become familiar with these techniques do they move into the realm of aesthetic acceptability (Thayer 1994; Bohdanowicz 2005). But given that ecologically performative landscapes are often perceived as "messy" (Nassauer 2002, 196), a compatibility issue arises when considering implementation of such visible technologies within landscapes that require a high level of aesthetic refinement.This research examines perceptions of ecologically performative landscape practices held by …
Innovative Storm Water Best Management Practices : Their Influence On Landscape Architecture In North Texas, Jason Christopher Voight
Innovative Storm Water Best Management Practices : Their Influence On Landscape Architecture In North Texas, Jason Christopher Voight
Landscape Architecture Masters & Design Theses - Archive
The land development process is essentially a three step progression consisting of input from developers who envision and fund a project, designers who translate the developer's vision into a buildable project, and the regulators who ensure that the project upholds, to the extent allowable by law, the health, safety, and welfare of mankind including the environment.As an outgrowth of this development model, the modern American city has evolved overtime into a sprawling metropolis, which has had a direct, deleterious impact on watersheds. To address these detrimental impacts, storm water regulations have been authored on federal, state, and local levels, which …
Bookmarks 2009, Evelyn Barker
Bookmarks 2009, Evelyn Barker
Information Literacy Resources-Archive
Bookmarks of students and faculty at UT Arlington.
Deep Economy (Reader's Guide), Chris Conway, Evelyn Barker
Deep Economy (Reader's Guide), Chris Conway, Evelyn Barker
Information Literacy Resources-Archive
No abstract provided.
Magnetically Anchored "Reduced Trocar" Laparoscopy: Evolution Of Surgical Robotics, Richard Bergs
Magnetically Anchored "Reduced Trocar" Laparoscopy: Evolution Of Surgical Robotics, Richard Bergs
Bioengineering Theses - Archive
Laparoscopic surgery has become increasingly popular over the last few years due to its benefits; lower morbidity, less perceived pain, better cosmesis results, and less hospital time. For the surgeon however, there are fundamental issues that can make a laparoscopic procedure more difficult than simple open surgery; loss of tactile feel, limited working envelope, high demand for hand-eye coordination, and one trocar-port required for each tool. A revolutionary concept of using magnetics to support tooling across the abdominal wall was conceived by Dr. Jeffrey Cadeddu and his colleagues at the University of Texas Southwestern Medical Center. Collectively referred to as …
Compass Rose Newsletter, Various Various
Compass Rose Newsletter, Various Various
UTA Libraries Staff Publications - Archive
No abstract provided.
Celebration Of Faculty Creative Works, 2007-2008, University Of Texas At Arlington Library, Ut Arlington Office Of The Provost
Celebration Of Faculty Creative Works, 2007-2008, University Of Texas At Arlington Library, Ut Arlington Office Of The Provost
Faculty Creative Works-Archive
The UT Arlington Library and the Office of the Provost are pleased to host the first exhibition of books, creative works, and patents created by UT Arlington faculty and staff in 2007-2008. We plan to make this signature event an annual celebration at UT Arlington. The idea of the exhibition started with Tommie Wingfield, assistant to the dean of the library for marketing and external relations, and the fact that the exhibit is taking place is testament to her tenacity and hard work.
The Compass Rose Vol. Xxiii, No. 1, University Of Texas At Arlington Library Special Collections & Archives
The Compass Rose Vol. Xxiii, No. 1, University Of Texas At Arlington Library Special Collections & Archives
The Compass Rose
The purpose of The Compass Rose is to raise awareness of Special Collections' resources and to foster the use of these resources. The newsletter also reports significant new programs, initiatives, and acquisitions of Special Collections. The issues included here are scans of print newsletters from the 1990s and 2000s. Current issues and posts of The Compass Rose can now be accessed on the UTA Libraries Compass Rose Blog.
Synthesis And Dip-Pen Nanolithographical Patterning Of Ferrite Nanoparticles, Jingwen He
Synthesis And Dip-Pen Nanolithographical Patterning Of Ferrite Nanoparticles, Jingwen He
Material Science and Engineering Theses - Archive
Magnetic nanoparticles are of great interest for researchers from a wide range of disciplines, including magnetic fluids, catalysis, biotechnology/biomedicine, magnetic resonance imaging, data storage, and environmental remediation. Ferrites, a class of ferrimagnetic ceramic compounds with the chemical formula of MFe₂O₄, where M represents any one of several metallic elements such as Mg, Fe, Co, Ni, Cu and so on, are commonly used magnetic materials for nanoparticles. Magnetite (Fe3O₄) is the prototype of ferrites. Magnetite nanoparticles have been prepared through the co-precipitation of Fe²⁺ and Fe³⁺ aqueous salt solutions by addition of base. They exhibit a size distribution from 4 nm …