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Thermal Enhancement Of Stacked Dies Using Thermal Vias, Baekyoung Sung Nov 2006

Thermal Enhancement Of Stacked Dies Using Thermal Vias, Baekyoung Sung

Mechanical and Aerospace Engineering Theses - Archive

Following Moore's law, the number of transistors on a die continues to rise and has recently exceeded a billion on high end processors. In light of the convergence of technology, power requirements is becoming a serious concern even on low density interconnect systems such as cellular phones and personal digital assistants. Also, in order to minimize foot prints, the recent trend in packaging is stacking. The stacking, however, creates challenges in cooling and especially if one is to include logic in the stack. The primary heat flow path for stacking is through the substrate and as the number of stacks …

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Phase Locked Loop For Radiation Hardened Environment, Jer-Fu Dennis Wu Nov 2006

Phase Locked Loop For Radiation Hardened Environment, Jer-Fu Dennis Wu

Electrical Engineering Theses - Archive

This thesis describes a Phase Locked Loop (PLL) design for operation within a radiation environment. Specific design architecture and techniques were implemented to help mitigate radiation effects that degrade PLL performance. This thesis presents several elements of a rad-hard PLL that were developed to solve this challenge, such as a very wideband coupling coefficient LC VCO that has a much higher frequency tuning range than conventional varactor based LC VCOs. The PLL consists a Phase and Frequency Detector (PFD), a rail to rail charge pump, a loop filter, the quadrature LC tank Voltage Controlled Oscillator (VCO), a Current Mode Logic …

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Inductive Theoretical Integration: Approaching A General Theory Of Crime, Mark Christopher Saber Nov 2006

Inductive Theoretical Integration: Approaching A General Theory Of Crime, Mark Christopher Saber

Criminology & Criminal Justice Theses - Archive

The purpose of this study is to discuss and use theoretical integration in an attempt to better explain criminal behavior. Data for this study was obtained through a random power sample of undergraduate college students enrolled in criminology and criminal justice classes. Respondents chose a criminal behavior from a typology of drug, property, or violent criminal acts, and then chose theories which could aid in the explanation of that criminal behavior. The respondents were also asked the same concerning self-reported criminal activity. Analysis of the data showed that theoretical integration was used, by the respondents, to explain drug-related crimes committed …

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Law Enforcement Grants, A Comparison Of Funded Grant Awards, Kenneth Myers Nov 2006

Law Enforcement Grants, A Comparison Of Funded Grant Awards, Kenneth Myers

Criminology & Criminal Justice Theses - Archive

The research focuses on 48 federally funded / awarded grants from the United States Department of Justice, Community Oriented Police Services Office and the Department of Homeland Security. A measurement instrument was developed to extract data from the grants for the purpose of determining if similarities existed among the awarded grants. The grants chosen came from jurisdictions of all types, sizes and demographics and represent a cross-section of American law enforcement. Once the data was collected, it was analyzed and examined for similarities. The data is presented in a manner that allows the reader determine if the information presented can …

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Connections: Library News For Library Staff Vol. 3, Issue 11, University Of Texas At Arlington Library Nov 2006

Connections: Library News For Library Staff Vol. 3, Issue 11, University Of Texas At Arlington Library

Connections: Library News for Library Staff

The purpose of Connections was to build community within UTA Library staff by reminding people of upcoming events and dates, introducing new staff members, celebrating a department's achievements, and writing about other items of interest.

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Models And Algorithms To Determine Cerebral Activation Using Near Infrared Spectroscopy, Monica Suresh Allen Nov 2006

Models And Algorithms To Determine Cerebral Activation Using Near Infrared Spectroscopy, Monica Suresh Allen

Electrical Engineering Dissertations - Archive

The specific aims of this dissertation were to develop: (1) Correlations between experimental protocols and oxygenated, deoxygenated, and total hemoglobin concentrations in the brain (2) Mathematical models to associate blood flow and oxygen consumption rate of the activated brain regions with measured hemodynamic changes (3) A phantom that models brain vasculature compliance to validate developed mathematical models in a controlled setup. The primary imaging modality used in the experimentation phase of this research was near infrared spectroscopy. Previously published multimodality measurements were also used to validate the mathematical models. The single compartment Windkessel model was extended to describe flow-volume dynamics …

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Expressions For Bond Stress Of A Tension Splice In Steel Reinforced Concrete, Jkumar Gopalarathnam Oct 2006

Expressions For Bond Stress Of A Tension Splice In Steel Reinforced Concrete, Jkumar Gopalarathnam

Civil Engineering Theses - Archive

The aim of the research is to develop expressions for the bond stress at a tension splice in reinforced concrete. Many experiments have been conducted inorder to ascertain the relationship between appropriate variables and develop an expression to evaluate the bond stress. The scope of this research is to use existing experimental data to establish a relation and develop an expression. Before the preprocessing begins, the data are organized into different categories such as bottom, top and side bars, and bars with transverse reinforcement. The existing experimental data is evaluated for statistical validation. It is then subjected to individual and …

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The Acute Effects Of Active Warm-Up And Passive Warm-Up On Passive Tension, Troyce Solley Oct 2006

The Acute Effects Of Active Warm-Up And Passive Warm-Up On Passive Tension, Troyce Solley

Kinesiology Theses - Archive

The purpose of this study was to investigate the effects of active warm-up (stationary cycling) and passive warm-up (heat pack) on the mechanical properties of the hamstring musculature in vivo. Passive tension measurements were recorded during the passive knee extensions of ten men before and after an active warm-up, passive warm-up, and control treatments. The results of the present investigation revealed no effect of active warm-up or passive warm-up on the passive tension variables of energy absorbed, energy returned, peak torque, average stiffness, or peak stiffness of the hamstring musculature. These findings suggest that the mechanical properties of the connective …

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The Compass Rose Vol. Xx, No. 2, University Of Texas At Arlington Library Special Collections & Archives Oct 2006

The Compass Rose Vol. Xx, No. 2, 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.

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Connections: Library News For Library Staff Vol. 3, Issue 10, University Of Texas At Arlington Library Oct 2006

Connections: Library News For Library Staff Vol. 3, Issue 10, University Of Texas At Arlington Library

Connections: Library News for Library Staff

The purpose of Connections was to build community within UTA Library staff by reminding people of upcoming events and dates, introducing new staff members, celebrating a department's achievements, and writing about other items of interest.

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Enterprise Resource Planning Productivity Function:The Impact Of Ceo Holdings And Horizon And Implementation Characteristics, Husain Yousef Alyousef Sep 2006

Enterprise Resource Planning Productivity Function:The Impact Of Ceo Holdings And Horizon And Implementation Characteristics, Husain Yousef Alyousef

Accounting Dissertations - Archive

The productivity of Enterprise Resource Planning (ERP) systems has been discussed in several other studies in the past decade. Those studies utilized several research methodologies, including case studies, surveys and archival data. The results were largely consistent with the theoretical predictions that ERP implementation enhances firm productivity. The only exceptions were the results of studies that were conducted using financial archival data as a measure of productivity. This study predicts that the exceptional findings of the previous studies in the ERP-productivity relationship are due to the failure to consider several important factors: CEO equity holdings and horizon, timing of the …

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Monitoring And Fault Diagnosis Of Multiconverter Power Electronic Systems, Ranjit Jayabalan Sep 2006

Monitoring And Fault Diagnosis Of Multiconverter Power Electronic Systems, Ranjit Jayabalan

Electrical Engineering Dissertations - Archive

Over the recent years the electric loads in automobiles have increased considerably due to advancements in high-power semiconductor based converters. However, with increasing electrical and electrically driven loads, there have been increasing concerns on system reliability. Faults occurring in such application specific solid state converters can lead to fatal consequences as compared to their mechanical counter parts. Thus, it is vital to identify faults in such systems to develop necessary safety techniques and methodologies. Detailed analysis of faults processes has indicated the need to act quickly following a device failure to prevent propagation of faults that may lead to catastrophic …

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Connections: Library News For Library Staff Vol. 3, Issue 9, University Of Texas At Arlington Library Sep 2006

Connections: Library News For Library Staff Vol. 3, Issue 9, University Of Texas At Arlington Library

Connections: Library News for Library Staff

The purpose of Connections was to build community within UTA Library staff by reminding people of upcoming events and dates, introducing new staff members, celebrating a department's achievements, and writing about other items of interest.

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American Literary Scholarship: An Annual 2004, David J. Nordloh, David M. Robinson, Thomas R. Mitchell, Dennis Berthold, M. Jimmie Killingsworth, Alan Gribben, Sarah Daugherty, Carol J. Singley, Ann Moseley, Alec Marsh, Jayme Stayer, Joseph R. Urgo, Hilary K. Justice, Robert W. Trogdon, William J. Scheick, Ed Piacentino, Nicolas S. Witschi, Donna M. Campbell, Catherine Calloway, Jerome Klinkowitz, Camille Norton, Frank Kearful, James J. Martine, Theodore O. Mason Jr., Maria Anita Stefanelli, Keiko Beppu, Bo G. Ekelund, Lene Johannessen, Henrik Lassen, Elżbieta H. Oleksy, Zoltán Abádi-Nagy Sep 2006

American Literary Scholarship: An Annual 2004, David J. Nordloh, David M. Robinson, Thomas R. Mitchell, Dennis Berthold, M. Jimmie Killingsworth, Alan Gribben, Sarah Daugherty, Carol J. Singley, Ann Moseley, Alec Marsh, Jayme Stayer, Joseph R. Urgo, Hilary K. Justice, Robert W. Trogdon, William J. Scheick, Ed Piacentino, Nicolas S. Witschi, Donna M. Campbell, Catherine Calloway, Jerome Klinkowitz, Camille Norton, Frank Kearful, James J. Martine, Theodore O. Mason Jr., Maria Anita Stefanelli, Keiko Beppu, Bo G. Ekelund, Lene Johannessen, Henrik Lassen, Elżbieta H. Oleksy, Zoltán Abádi-Nagy

Covers, Titles, and Tables: The Formations of American Literary Canons in Anthologies - Archive

Contains Title Page, Table of Contents

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Kite Runner Bookmarks, Evelyn Barker Sep 2006

Kite Runner Bookmarks, Evelyn Barker

Information Literacy Resources-Archive

Bookmarks for the fall and spring semesters relating to the 2006-2007 OneBook, The Kite Runner.

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Self-Assembly Of Nanoparticles In Photonic Crystal Cavities For Optoelectronic Devices, Geetha Thiruvengadam Aug 2006

Self-Assembly Of Nanoparticles In Photonic Crystal Cavities For Optoelectronic Devices, Geetha Thiruvengadam

Material Science and Engineering Theses - Archive

Photonic crystals (PhC) offer many advantages in optoelectronics field. The focus of this thesis is to investigate a self assembly process for the formation of thin film based one-dimensional PhC and the integration of nanoparticles with two-dimensional PhC. Nanoparticles like SiO2, TiO2, PolyStyrene, and PbSe (with different surface properties) were subjected to different experiments. Various techniques, such as spin coating, immersion technique, evaporation induced assembly technique, have been carried out by varying parameters like time, temperature, position of the substrate, etc.,. An optimized method for the fabrication of 1D PhC was found to be evaporation induced Self-Assembly method by varying …

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Uncertainty Characterization Of Orbital Debris, Jolanta Matusewicz Aug 2006

Uncertainty Characterization Of Orbital Debris, Jolanta Matusewicz

Mechanical and Aerospace Engineering Theses - Archive

The increase of orbital debris in the low Earth orbit is a concern for the space industry. Spacecraft and satellites are at risk of collision with orbital debris. Collisions can damage sensitive components or result in catastrophic failure. Organizations such as the United States Space Command are responsible for tracking orbital debris using ground based sensor sites located around the world. Orbit determination techniques are used to estimate the position and velocity of the orbit using range, azimuth, and elevation measurements obtained from the sensors. Nine sensors from the Space Surveillance Network are simulated to track a debris object in …

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Analysis And Design Of A Piezoelectric Micro-Actuator, Po-Shiun Chen Aug 2006

Analysis And Design Of A Piezoelectric Micro-Actuator, Po-Shiun Chen

Mechanical and Aerospace Engineering Theses - Archive

Micro-grippers are usually fabricated of silicon using traditional semiconductor manufacturing processes and actuated based on thermal energy input causing their temperature to substantially increase and render unsuitable for certain applications such as biological tissue handling. In this research work, the design of a micro-gripper using piezoelectric ceramics (PZT) is presented as an alternative to silicon based micro gripper. The design procedure utilized ANSYS, a Finite Element Method based software tool to verify simple PZT models and subsequently evaluate the stroke for a family of configurations. The configurations were further explored and optimized considering that the fabrication would be performed using …

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Mems Packaging: Fluxless Soldering And Reliability Assessment, Amit L. Patil Aug 2006

Mems Packaging: Fluxless Soldering And Reliability Assessment, Amit L. Patil

Mechanical and Aerospace Engineering Theses - Archive

This thesis presents process development and reliability assessment of the fluxless packaging of the MEMS devices. This packaging consists of metallized Kovar package with side wall of same material and circular holes for the optical fiber interconnect between the microstructures on the chip and the macro-environment. The back of the MEMS chip and the soldering part of the optical fiber is metallized. A thin solder perform is placed between the chip and the metallized package to attach the chip and a circular solder perform is used to attach the fiber to the metal substrate. The soldering process is fluxless hence …

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Spacecraft Formation Flight: Analysis Of The Perturbed J2-Modified Hill-Clohessy-Wiltshire Equations, Jeffery Scott Ginn Aug 2006

Spacecraft Formation Flight: Analysis Of The Perturbed J2-Modified Hill-Clohessy-Wiltshire Equations, Jeffery Scott Ginn

Mechanical and Aerospace Engineering Theses - Archive

With the recent technological gains made in satellite design and manufacturing, there has been great interest in utilizing a cluster of satellites to perform the same tasks performed by larger satellites. Historically, this has been done utilizing the Clohessy-Wiltshire equations, or the Hill's equations, as a benchmark for understanding the physics of the relative motion between two spacecraft. A variety of different models have been derived and implemented to study the relative motion dynamics since the Hill-Clohessy-Wiltshire (HCW) equations. Some of these models, like the HCW equations, are linearized and have analytical solutions. These models make the underlying physics due …

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Effect Of Crac Location On A Fixed Rack Layout Of A Data Center, Vishwas Bedekar Aug 2006

Effect Of Crac Location On A Fixed Rack Layout Of A Data Center, Vishwas Bedekar

Mechanical and Aerospace Engineering Theses - Archive

Microprocessor driven escalation of thermal management needs has resulted in significant cooling challenges at the data center facility level, which can house thousands and tens of thousands of heat producing processors. Raised floor air ducting is the most common configuration, where chilled air from the air conditioning units is forced into the room via a under floor plenum and through perforated tiles on the floor. The hot air from the racks finds its way to the top of the air conditioning units and is then cooled and blown into the under floor plenum. The temperature at inlet of the racks …

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Preparation And Characterization Of Doped Zinc Oxide, Yogeeswaran Ganesan Aug 2006

Preparation And Characterization Of Doped Zinc Oxide, Yogeeswaran Ganesan

Material Science and Engineering Theses - Archive

Cathodic electrodeposition was used to prepare thin films of ZnO doped with Cd, from oxygenated KCl electrolyte containing ZnCl2 and CdCl2 in various molar ratios ranging from 0 mM to 5.0 mM each. Evidence for doping was obtained from X-ray powder diffraction, diffuse reflectance, chronopotentiometry, and X-ray photoelectron spectroscopy data. The Cd-doped ZnO samples showed a superior photoresponse relative to undoped ZnO. Cadmium- and indium-doped ZnO were prepared by combustion synthesis using CdCl2 and InCl3 as dopant precursors along with zinc nitrate and urea as the combustion mixture. The doped samples were compared and contrasted with undoped ZnO using scanning …

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Graduate Business Education And Perceptions Of Employment Opportunities, Frederick Robert Buchanan Aug 2006

Graduate Business Education And Perceptions Of Employment Opportunities, Frederick Robert Buchanan

Business Administration Dissertations - Archive

The value of master's level business education has been previously studied primarily through cost/benefit analysis, generally confirming that MBAs make more money. This study addresses the large question of the value of business master's education by carving out a small area of interest. It looks at the relationship of individual differences to perceptions of organizational mobility, which is a precursor to voluntary turnover. Three research questions are investigated. The first question is the relationship of cognitive ability to perceived organizational mobility. Cognitive ability was not seen by itself to be significantly related to perceived organizational mobility. In conjunction with high …

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Defined Benefit Pensions: Funding And Asset Allocation Choices, Melissa Susan Lind Aug 2006

Defined Benefit Pensions: Funding And Asset Allocation Choices, Melissa Susan Lind

Business Administration Dissertations - Archive

Because of their large size, defined benefit pension plans are an important component of U.S. corporate finances and capital markets. The value of pension plans comprises a sizable portion of the sponsoring firm's assets and impacts the sponsoring firm's profitability and risk. Plan funding status has a direct impact on firm earnings. Corporate sponsors of overfunded plans may reduce or eliminate cash contributions to the plan, improving earnings. In contrast, underfunded plans require large expedited contributions that lower earnings. Plan investment choices may magnify the effect of funding on earnings when markets are volatile and managers invest a greater portion …

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Information Technology Sophistication And Outcomes Of Acute Care Hospitals In Texas, Valeria Hart Aug 2006

Information Technology Sophistication And Outcomes Of Acute Care Hospitals In Texas, Valeria Hart

Public Affairs Dissertations - Archive

This exploratory study tested relationships between information technology sophistication and clinical and financial outcomes of acute care hospitals. The hospital sample was Texas hospitals (N =175) with available data for a profile of their information technology infrastructure, combined with demographic and operations data from public use files for the annual 2002 reporting period. Three measures of information technology sophistication were used: functional, technical, and integration of information, with an additional composite index measure. Clinical outcomes were measured using selected Agency of Healthcare Research and Quality (AHRQ) Patient Safety Indicators and in-hospital mortality. Patient revenues by number of days and admissions …

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Characterization Of Cemented And Fiber-Reinforced Rap Aggregate Materials For Base/ Sub-Base Applications, Carlos A. Ordonez Aug 2006

Characterization Of Cemented And Fiber-Reinforced Rap Aggregate Materials For Base/ Sub-Base Applications, Carlos A. Ordonez

Civil Engineering Theses - Archive

The engineering product known as RAP is a bonded base and sub-base material produced by the process of blending crushed recycled construction and demolition waste and debris to specified gradation requirements, and by bonding these with a fine silica Portland cement matrix at optimum moisture for compaction density. RAP has a great potential as an economically, environmentally, and structurally sound alternative to non-bonded materials conventionally used for base/sub-base applications in pavement engineering. The present work is aimed at thoroughly testing the engineering properties of RAP product in order to assess its suitability as a structurally sound and environmentally safe material, …

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Flow Rate Measurement Of In Situ Perfusion Through The Aqueous Humor Outflow Network, Noel Ortiz Lawrence Aug 2006

Flow Rate Measurement Of In Situ Perfusion Through The Aqueous Humor Outflow Network, Noel Ortiz Lawrence

Bioengineering Theses - Archive

A system was developed to measure the instantaneous perfusate flow rate through the aqueous humor outflow network of a human eye, while under constant pressure. The system monitors real-time weight changes of a perfusate reservoir associated with perfusate flow through the aqueous humor outflow network. The recorded weight changes of the reservoir are used as an indicator of flow rates. Methods to determine time and flow rate resolution and to control for evaporation were also developed. The system is capable of measuring flow on a uL/min scale; determined by the following model, which also includes a range of uncertainty (implies …

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Detection Of Sleep Disordered Breathing Using Electroencephalography, Priya Xavier Aug 2006

Detection Of Sleep Disordered Breathing Using Electroencephalography, Priya Xavier

Bioengineering Theses - Archive

This study investigates the application of Electroencephalography (EEG) to detect Sleep disordered breathing (SDB) using power spectral analysis. A preliminary study was performed on 13 subjects (ages: 49.08 ± 8.82) previously diagnosed with OSA. Power spectral analysis was performed and centered on apnea/hypopnea event terminations. The normalized power changes between the frequency bands delta, theta, alpha and sigma were calculated using the Welch Averaging Periodogram method between 10 s of EEG data before the event termination and 10 s of EEG data after event termination. A significant decrease in normalized delta power and a significant increase in normalized theta, alpha …

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Characterization And Feasibility Study Of A Near Infrared Ccd Imager For Monitoring Tumor Hemodynamics, Manan Goel Aug 2006

Characterization And Feasibility Study Of A Near Infrared Ccd Imager For Monitoring Tumor Hemodynamics, Manan Goel

Bioengineering Theses - Archive

Prostate cancer is one of the most common types of cancers diagnosed among North American men. Chemotherapy is generally used to target advanced metastatic prostate cancer. Near infrared spectroscopy (NIRS) has been previously investigated to monitor the hemodynamic changes in rat prostate tumors; however, the previous study with NIRS is limited by its spatial resolution. The goal of this study is to characterize an NIR, CCD imager and to explore the feasibility of using the CCD imager to non-invasively monitor hemodynamic changes in rat prostate tumors during gas intervention. Firstly, studies were conducted to characterize the CCD imager and understand …

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Impact Of A Pre-Combustion Retrofit Device On Vehicular Emissions: A Case Study, Sri Harsha Kanukolanu Aug 2006

Impact Of A Pre-Combustion Retrofit Device On Vehicular Emissions: A Case Study, Sri Harsha Kanukolanu

Civil Engineering Theses - Archive

Vehicular emissions are a major cause of air pollution in the cities worldwide. Increased numbers of vehicles and the vehicle miles traveled by them every year means that the emissions are going to have a detrimental effect on the life and environment of this planet. Various control strategies are employed by the transportation and air quality managers at the state and regional levels to improve the ambient air quality. This research was conducted as part of the North Central Texas Council of Governments' Aftermarket Technology and Fuel Additive Research Program, its effort to make the DFW region's air cleaner. The …

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