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University of Texas at Arlington

Theses/Dissertations

2011

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An Innovative Epitaxial Growth Method For Minimizing Dislocations In Thin-Film Quantum-Dot Optoelectronic And Photovoltaic Device Applications, Jateen Gandhi Dec 2011

An Innovative Epitaxial Growth Method For Minimizing Dislocations In Thin-Film Quantum-Dot Optoelectronic And Photovoltaic Device Applications, Jateen Gandhi

Material Science and Engineering Dissertations

A new buffer layer method for epitaxial growth of lattice-mismatched semiconductor quantum-dots based p-i-n structures is presented. To our knowledge this is the first instance of a dislocation-reduction approach that has shown reduced dark current behavior in a quantumdot device compared to its counterpart homojunction p-n device consisted of the barrier material. The present work compared a lattice misfit strain build-up behavior between an In0.15Ga0.85As (p) / InAs (i) / In0.15Ga0.85As (n) (QD) device to an In0.15Ga0.85As (p) / In0.15Ga0.85As (n) (HOM) device, as both were grown on an un-doped gallium arsenide (GaAs) (100) substrate. The intrinsic region of QD …

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Fundamental Understanding Of Soot Induced Wear Mechanism Of Diesel Engines, Mihir Patel Dec 2011

Fundamental Understanding Of Soot Induced Wear Mechanism Of Diesel Engines, Mihir Patel

Material Science and Engineering Dissertations

Emission of Oxides of nitrogen and particulates matters from diesel engines have been reduced by implementing exhaust gas recirculation (EGR) protocols but at the expense of increased wear of engine components. This problem is aggravated by Environment Protection Agency (EPA) regulation such as API CJ 4 and SAPS where chemical limits have been places on the amount of phosphorous, sulfur and sulfated ash in lubrication oil. Several studies have examined the role played by diesel soot on enhanced wear but none have provided comprehensive mechanism. This would allow the possibility to comprehend fundamental understanding of soot induced wear mechanism of …

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Templated Synthesis And Characterizations Of High Moment Magnetic Nanoparticles For Bioapplications, Punnapob Punnakitikashem Dec 2011

Templated Synthesis And Characterizations Of High Moment Magnetic Nanoparticles For Bioapplications, Punnapob Punnakitikashem

Material Science and Engineering Dissertations

Magnetic nanoparticles have been widely used for biomedical applications such as drug and gene delivery, hyperthermia treatment of cancer, MRI contrast enhancement, cell labeling and magnetic separation. We present two new types of magnetic nanoparticles for bioapplications; granular superparamagnetic gold nanoparticles and multilayered nanodisks. Granular superparamagnetic gold nanoparticles consist of superparamagnetic islands embedded in a gold matrix. Multilayered nanodisks consist of two magnetic layers separated by a non-magnetic layer with two capping layers. Capping layers such as gold provide functionalization sites for biomolecule attachment. These nanoparticles possess two key magnetic requirements for bioapplications, a high saturation magnetic moment and a …

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Electrochemical N-Type Doping In Metal Oxides And Its Application In Photovoltaics, Xiaofei Han Dec 2011

Electrochemical N-Type Doping In Metal Oxides And Its Application In Photovoltaics, Xiaofei Han

Material Science and Engineering Dissertations

Electrodeposition has the advantages of low-cost, high-throughput and large-area processing which is particularly suitable for solar cells fabrication. Two common metal oxides prepared by electrodeposition are discussed here, ZnO and Cu2O. ZnO is largely used in the solar cells as the window and transparent contact material. Cu2O is potential absorption material for next generation solar cell. n-type doping of these metal oxides was revealed during electrochemical deposition. For naturally n-type ZnO, n-type doping is achieved by substituting the cation (Zn) with a group III element (Al, Ga and Y) and for naturally p-type Cu2O, n-type doping is realized by substituting …

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Building A Foundation For Knowledge Management Research: Developing, Validating, And Applying The Knowledge Internalization Construct, Kamphol Wipawayangkool Oct 2011

Building A Foundation For Knowledge Management Research: Developing, Validating, And Applying The Knowledge Internalization Construct, Kamphol Wipawayangkool

Information Systems & Operations Management Dissertations

The notion of knowledge internalization (KI), albeit a critical link in Nonaka's (1994) organizational knowledge creation theory, has not been rigorously conceptualized and defined, let alone operationalized. To strengthen the foundation for knowledge management (KM) research, we attempt to fulfill the following research objectives in the three essays of this dissertation. In the first essay, by drawing from Anderson (1983)'s ACT (adaptive control of thought) theory and Glaser et al. (1985)'s framework on the dimensions of cognitive skills, we develop the construct of KI and demonstrate its nomological validity by examining its role in knowledge sharing phenomenon through its relationships …

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Protocols For Use Of The Cela Academic Information System, Alexandra Mariaaguiar Leister Jul 2011

Protocols For Use Of The Cela Academic Information System, Alexandra Mariaaguiar Leister

Landscape Architecture Masters & Design Theses

The Academic Information System (AIS) is a digital database used by academic administrators in landscape architecture programs to store and analyze information about the operations of their academic units. It is an information access tool that allows administrators to compare information about their academic units with information from clusters of other academic units also involved in the education of landscape architects. The reasons for CELA to create the AIS were "to eliminate the making of critical decisions about landscape architecture education based on intuition-driven information reinforcing the idea that there are priorities for releasing the data" (Taylor, Ellis, Ozdil 2010). …

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An Exploration Of The Attributes Of Sense Of Place In A Culturally-Diverse Dallas District: Learning From Cedar Springs Case Study, Susan Alford Jul 2011

An Exploration Of The Attributes Of Sense Of Place In A Culturally-Diverse Dallas District: Learning From Cedar Springs Case Study, Susan Alford

Landscape Architecture Masters & Design Theses

Neighborhood centers rich in cultural diversity and history are desirable and special places for communities. Cedar Springs "The Strip" is a dynamic gay commercial neighborhood center serving Cedar Springs district's and is specified as unique although experiencing socio-spatial changes in character as expressed by its community (Vanderslice, 2008; Zillow, 2010). Even though research in literature reveals various definitions of sense of place, it is not clear what attributes make a particular place special and desirable such as Cedar Springs district which in turn can inform design and plans to respond to the community's sense of place. This research identifies and …

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Race And Cricket: The West Indies And England At Lord's, 1963, Harold Richard Herbert Harris May 2011

Race And Cricket: The West Indies And England At Lord's, 1963, Harold Richard Herbert Harris

History Dissertations

Cricket became a sport in which there was a clear separation based on race and class; and these distinctions initially determined function within the sport. In England, where the distinction was based mostly on class, the aristocracy, who initially enjoyed watching their workers at play, became involved in playing the game, and determined roles aligned to class. In the West Indies, the distinction was determined by race. However, racial mixing blurred these demarcations and soon the underclass began to encroach onto a space that the sport had created for them. In due course, function within the sport faded into insignificance …

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A Search For Design Appropriateness Using Qualitative Techniques To Contrast The Mountain Resort Community Cores Of Vail Village And Beaver Creek Village, Jared Sylor Mar 2011

A Search For Design Appropriateness Using Qualitative Techniques To Contrast The Mountain Resort Community Cores Of Vail Village And Beaver Creek Village, Jared Sylor

Landscape Architecture Masters & Design Theses

This study uses in-depth interviews to compare the mountain resort village cores of Vail Village and Beaver Creek Village to determine levels of design appropriateness in each. Design appropriateness for a village core is defined as an outdoor, multi-chambered, visually stimulating environment that encourages and invites human activity and repeat visits to the village core and ski resort (Dorward 1990.) An appropriately designed village core "encourages visitors to wander, explore the special places and unique features of the village, people-watch, and interact amiably with strangers in a diverse mix of gathering places and open-air seating" (Dorward 2006, p.273.) Design appropriateness …

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Toward An Ontology Of Design Philosophy In Landscape Architecture: Developing A Personal Design Philosophy, Rhonda Erin Fields Mar 2011

Toward An Ontology Of Design Philosophy In Landscape Architecture: Developing A Personal Design Philosophy, Rhonda Erin Fields

Landscape Architecture Masters & Design Theses

This thesis uses qualitative inquiry to examine the process for developing a personal design philosophy. The larger goal of the study seeks to understand the universal and particulars of design as philosophy with the intent to develop an ontology for design philosophy in landscape architecture. "Design is a crucial factor in the relation between beings and worlds as they shape each other, yet as a philosophy, design itself hardly exists" (Willis, 2009). Willis and others in the field of design philosophy suggest that design as a philosophy has only recently begun to be studied. Further, to begin an understanding of …

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Compatibility Of Urban Edible Landscaping To The Sustainable Sites Initiative's Goals And Design Criteria., Cheryl Beesley Mar 2011

Compatibility Of Urban Edible Landscaping To The Sustainable Sites Initiative's Goals And Design Criteria., Cheryl Beesley

Landscape Architecture Masters & Design Theses

This research addresses edible landscapes through the lens of The Sustainable Sites Initiative (SITES). The Sustainable Sites Initiative is a collaboration of the American Society of Landscape Architects (ASLA), The Ladybird Johnson Wildlife Center and the United States Botanic Garden. The team of professionals working on SITES has developed a manual for sustainable site development and landscaping practice that include guidelines regarding site development, installation, and maintenance practices. Various levels of certification can be obtained by accumulating points in categories that relate to new site construction or site renovation. It is the purpose of this thesis to research how urban …

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A Search For Design Appropriateness Using Qualitative Techniques To Contrast The Mountain Resort Community Cores Of Vail Village And Beaver Creek Village, Jared Sylor Mar 2011

A Search For Design Appropriateness Using Qualitative Techniques To Contrast The Mountain Resort Community Cores Of Vail Village And Beaver Creek Village, Jared Sylor

Landscape Architecture Masters & Design Theses

This study uses in-depth interviews to compare the mountain resort village cores of Vail Village and Beaver Creek Village to determine levels of design appropriateness in each. Design appropriateness for a village core is defined as an outdoor, multi-chambered, visually stimulating environment that encourages and invites human activity and repeat visits to the village core and ski resort (Dorward 1990.) An appropriately designed village core "encourages visitors to wander, explore the special places and unique features of the village, people-watch, and interact amiably with strangers in a diverse mix of gathering places and open-air seating" (Dorward 2006, p.273.) Design appropriateness …

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Toward An Ontology Of Design Philosophy In Landscape Architecture: Developing A Personal Design Philosophy, Rhonda Erin Fields Mar 2011

Toward An Ontology Of Design Philosophy In Landscape Architecture: Developing A Personal Design Philosophy, Rhonda Erin Fields

Landscape Architecture Masters & Design Theses

This thesis uses qualitative inquiry to examine the process for developing a personal design philosophy. The larger goal of the study seeks to understand the universal and particulars of design as philosophy with the intent to develop an ontology for design philosophy in landscape architecture. "Design is a crucial factor in the relation between beings and worlds as they shape each other, yet as a philosophy, design itself hardly exists" (Willis, 2009). Willis and others in the field of design philosophy suggest that design as a philosophy has only recently begun to be studied. Further, to begin an understanding of …

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Elementary Schoolyard Landscapes As Outdoor Learning Environments: North Texas Stakeholders' Perceptions Of The No Child Left Inside Act, Shawn Marie Bookout Mar 2011

Elementary Schoolyard Landscapes As Outdoor Learning Environments: North Texas Stakeholders' Perceptions Of The No Child Left Inside Act, Shawn Marie Bookout

Landscape Architecture Masters & Design Theses

So that children can be exposed to a more stimulating outdoor educational experience, the United States public education system developed and implemented strategies to accomplish an integrative approach between indoor and outdoor learning (Gardner 1991; Wells and Evans 2003; Titman 1994; Moore 1986). One of these strategies is to allow for an enhanced connection between children and the outdoor environment through the betterment of school landscapes. As described by Wohlwill (1983), the outdoor environment is - that vast domain of organic and inorganic matter that is not a product of human activity or intervention. The purpose of this study is …

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Elementary Schoolyard Landscapes As Outdoor Learning Environments: North Texas Stakeholders' Perceptions Of The No Child Left Inside Act, Shawn Marie Bookout Mar 2011

Elementary Schoolyard Landscapes As Outdoor Learning Environments: North Texas Stakeholders' Perceptions Of The No Child Left Inside Act, Shawn Marie Bookout

Landscape Architecture Masters & Design Theses

So that children can be exposed to a more stimulating outdoor educational experience, the United States public education system developed and implemented strategies to accomplish an integrative approach between indoor and outdoor learning (Gardner 1991; Wells and Evans 2003; Titman 1994; Moore 1986). One of these strategies is to allow for an enhanced connection between children and the outdoor environment through the betterment of school landscapes. As described by Wohlwill (1983), the outdoor environment is - that vast domain of organic and inorganic matter that is not a product of human activity or intervention. The purpose of this study is …

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Impact Of Suburbs: Assessing Tree Coverage Using Geo-Spatial Tools In The City Of Fort Worth, James Colton Yorek Mar 2011

Impact Of Suburbs: Assessing Tree Coverage Using Geo-Spatial Tools In The City Of Fort Worth, James Colton Yorek

Landscape Architecture Masters & Design Theses

Throughout the last century, developers kept pace with the growing housing demand, and in doing so, former rural landscape continued to become part of the urban fabric (Corrigan et al, 2004; Secker 2007). This newly acquired land is primarily being shaped by development typically in the form of single-family residential subdivisions (Berger, 2006). With the increasing consumption of land for development there are increasing concerns from the public surrounding issues of land use changes, natural resources, and the protection of land through conservation efforts (Johnston et al, 2006). One of these issues is the acceptance of the urban forest as …

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Nano-Modified Cement Composites And Its Applicability As Concrete Repair Material, Tanvir Manzur Jan 2011

Nano-Modified Cement Composites And Its Applicability As Concrete Repair Material, Tanvir Manzur

Civil Engineering Dissertations

Nanotechnology or Nano-science, considered the forth industrial revolution, has received considerable attention in the past decade. The physical properties of a nano-scaled material are entirely different than that of bulk materials. With the emerging nanotechnology, one can build material block atom by atom. Therefore, through nanotechnology it is possible to enhance and control the physical properties of materials to a great extent. Composites such as concrete materials have very high strength and Young's modulus but relatively low toughness and ductility due to their covalent bonding between atoms and lacking of slip systems in the crystal structures. However, the strength and …

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Adaptive High Level Context Reasoning In Pervasive Environments, Bridget B. Beamon Jan 2011

Adaptive High Level Context Reasoning In Pervasive Environments, Bridget B. Beamon

Computer Science and Engineering Dissertations

It is hard to believe that the Internet is now in its adolescent stage. This information age is replete with communication capable, intelligent, sensor equipped devices. Social networks, web services, and global information repositories make a wealth of information available instantly. There exist endless possibilities for creating useable knowledge. Much of what is considered useable knowledge is not directly observable from low level sensory devices. Abstract situations, relationships and activities must be inferred using a variety of techniques that fuse information from multivariate data sources. We refer to this useable knowledge as high level context. Social, physiological, environmental, computational, activity, …

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Effect Of Pavement Type On Fuel Consumption In City Driving, Palinee Sumitsawan Jan 2011

Effect Of Pavement Type On Fuel Consumption In City Driving, Palinee Sumitsawan

Civil Engineering Dissertations

Vehicular fuel consumption and emissions are two increasingly important measures of effectiveness of sustainable transportation systems, particularly considering that mobile sources in the U.S. account for the largest consumption of energy and generation of air pollution. Improving the energy efficiency of the transportation sector including improving vehicle shape, weight, engine size, and tire quality could play a vital role in reducing fuel consumption and exhaust gas emissions. Pavement surface type and other surface characteristics such as skid resistance and roughness affect vehicular fuel consumption. The main objective of this study has been to investigate any differences that might exist in …

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Development Of A Model Of Productivity For Horizontal Directional Drilling (Hdd), Mohmd Sarireh Jan 2011

Development Of A Model Of Productivity For Horizontal Directional Drilling (Hdd), Mohmd Sarireh

Civil Engineering Dissertations

Horizontal Directional Drilling (HDD) is a growing method for installation of pipes in urban areas and where ever trenching is impossible or undesirable; such as in crossing rivers, lakes, and railways, and special areas such as airports. This technique utilizes downhole cutting heads to create a pilot borehole before it is enlarged with back reamers to allow pulling back of a product pipe. The utilization of HDD for the installation of underground infrastructure (i.e., water, oil and gas pipes, telecommunication, power conduits, in some cases gravity pipes, and so on), has shown a rapid growth compared to other trenchless technologies. …

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Detect Program Vulnerabilities Using Trace-Based Security Testing, Dazhi Zhang Jan 2011

Detect Program Vulnerabilities Using Trace-Based Security Testing, Dazhi Zhang

Computer Science and Engineering Dissertations

Software vulnerabilities are program flaws that can be exploited by attackers to compromise the security of a software system. Although many approaches have been proposed to detect or prevent software attacks, software security incidents continue to occur every year. Security testing aims at detecting program vulnerabilities through a set of test cases and has shown to be effective to detect program vulnerabilities. The primary challenge is how to efficiently produce test cases that are highly effective in detecting vulnerabilities. This dissertation proposes trace-based security testing approaches towards addressing some fundamental challenges in security testing.The first study is to use trace-based …

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Concurrent Polyglot: An Extensible Compiler Framework, Saurabh Satish Kothari Jan 2011

Concurrent Polyglot: An Extensible Compiler Framework, Saurabh Satish Kothari

Computer Science and Engineering Theses

We have today crossed the threshold of increasing clock frequencies as the dominant solution to faster computing, and it is imperative for software developers to be able to think in the concurrent and parallel paradigm. Important still is to equip programmers with the right tools to develop concurrent and parallel software. Software concurrency is a widely researched area, and many of today's compilers concentrate on compiling for parallelism. However, although concurrent compilers have been explored since the 1970s, very few of them exist today that justify multicore environments. For instance, gmake [1] supports coarse grained parallelism through the -j option …

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Micromotion And Scarring Do Not Contribute To Failure Of Regenerative Peripheral Neural Interfacing, Nivedita Khobragade Jan 2011

Micromotion And Scarring Do Not Contribute To Failure Of Regenerative Peripheral Neural Interfacing, Nivedita Khobragade

Bioengineering Theses

Neuroprosthetics facilitate amputees with motor function restoration by interfacing nervous system with artificial limb and enabling control of the prosthetic device by volitional thought. Though such neurointerfacing provides dexterity nearly mimicking natural limb agility, the clinical viability of such prosthetics is limited by the lack of long-term reliability. In central nervous system, these implants fail due to foreign body reaction and glial scar formation around the implant. The cause of decrease in active sites of interfacing in peripheral nervous system, which is less invasive than central nervous system implantation, has not been established. Recently an open architecture, regenerative peripheral neural …

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Implementation Of A Pain Generator Controlled By Pressure And Feasability In Its Applications For Functional Near-Infrared Spectroscopy, Pamela Agwa Tebebi Jan 2011

Implementation Of A Pain Generator Controlled By Pressure And Feasability In Its Applications For Functional Near-Infrared Spectroscopy, Pamela Agwa Tebebi

Bioengineering Theses

Pain is a sensory and emotional experience as a result of possible or definite tissue damage. The level of pain is subjective to the individual's consciousness of sensory stimuli. Pain stimuli can be noxious (i.e., potentially damaging) or innocuous (i.e., normally not painful). Therefore, pain perception can be based on the degree of the stimuli. Studies have been done using brain imaging modalities to assess pain. Functional Near-infrared spectroscopy (fNIRS) is a noninvasive imaging tool and has been used to study the hemodynamic variations in the brain induced by a variety of activations. This research was a feasibility study to …

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Diagnosis Of Breast Cancer Using Auto-Flourescence Lifetime And Light Reflectance Spectroscopy: A Potential Tool For Positive Margin Assessment, Shivaranjani Shivalingaiah Jan 2011

Diagnosis Of Breast Cancer Using Auto-Flourescence Lifetime And Light Reflectance Spectroscopy: A Potential Tool For Positive Margin Assessment, Shivaranjani Shivalingaiah

Bioengineering Theses

Malignant Breast Neoplasm (MBN) or breast cancer is a heterogeneous cancer type originating in the breast tissue. Surgery is considered the primary treatment for breast cancer, with many early stage patients being cured without recurrence. The goals of the surgery include complete resection of the primary tumor, with negative margins to reduce the risk of local recurrences. Further, pathological staging of the tumor and axillary lymph nodes are carried out to extract necessary prognostic information. Surgery works well in case of complete Mastectomies. However, the biggest challenge for this technique is determining adequate margins on the partial mastectomy (lumpectomy) specimen. …

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Carbon Footprint Analysis Of A Large Diameter Water Transmission Pipeline Installation, Lalit Chilana Jan 2011

Carbon Footprint Analysis Of A Large Diameter Water Transmission Pipeline Installation, Lalit Chilana

Civil Engineering Theses

The term pipeline refers to a long line of connected segments of pipe, with pumps, valves, control devices, and other equipment or facilities needed for operating the system. Water transmission pipelines are generally large diameter (more than 12 in.) pipes which transport the water from one place to another. Installation of these pipes is a complex process due to variability of ground conditions over long distance installations. Sometimes, it is difficult to relate pipelines to the environment because of the out of sight nature. But it follows a close relationship with our environment due to various energy consuming activities involved …

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On The Effects Of The Circular Bolt Pattern On The Behavior Of The Extended End-Plate Connection, Roozbeh Kiamanesh Jan 2011

On The Effects Of The Circular Bolt Pattern On The Behavior Of The Extended End-Plate Connection, Roozbeh Kiamanesh

Civil Engineering Dissertations

This study is pioneer in introducing the circular bolt pattern configuration in extended end-plate steel connections. Discovering the static and cyclic behavior of such connections is at the forefront of this research study. To accomplish this goal, full-scale experimental testing complemented with three dimensional non-linear finite element analysis were conducted. Due to the similarity between the behavior of T-Stubs under tension, and tension flange of the extended end-plate connection, experimental study was conducted on several T-Stub connections to study the effect of the bolt pattern configuration on the ductility, bolt force distribution, flange deformation, and overall performance of the connection. …

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Evaluating Beat Structure And Truck Allocation For The Tarrant County Courtesy Patrol, Farzad Daneshgar Jan 2011

Evaluating Beat Structure And Truck Allocation For The Tarrant County Courtesy Patrol, Farzad Daneshgar

Civil Engineering Theses

Non-recurring congestion poses a significant concern to urban freeway drivers. Effective incident management relies on many tools to lessen the overall impact of crashes, road debris, and stalled/disabled vehicles. While many of the tools are based in a region's traffic management center, many urban areas have adopted freeway service patrol (FSP) programs that patrol the freeway network searching for incidents, providing aid to motorists, and assisting with incident management and clearance. While FSP operations can be assessed in terms of response and clearance times, FSP management must consider the beat structure and fleet allocation. This investigation considers response time and …

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A Computational Framework For Human-Centered Multimodal Data Analysis, Vangelis Metsis Jan 2011

A Computational Framework For Human-Centered Multimodal Data Analysis, Vangelis Metsis

Computer Science and Engineering Dissertations

Human-Centered computing defines a field of study in which computational processes affect the human being, either through ubiquitous and pervasive use of devices or any effect that improves the human condition. Human-Centered Computing applications face serious challenges in the handling of data collection, modeling, and analysis. Traditionally, the analysis of different aspects of human well-being derives from a variety of non-interrelated methods which has made it difficult to correlate and compare the different experimental findings for an accurate assessment of the contributing factors.This dissertation describes new algorithms that enable more accurate and efficient multimodal data analysis of Human-Centered computing applications …

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Investigation Of Neural Correlates Between Perception Of Pain And Hemodynamic Response Measured In The Pre-Frontal Cortex Using Functional Near Infra-Red Spectroscopy, Venkatagiri Krishnamurthy Jan 2011

Investigation Of Neural Correlates Between Perception Of Pain And Hemodynamic Response Measured In The Pre-Frontal Cortex Using Functional Near Infra-Red Spectroscopy, Venkatagiri Krishnamurthy

Bioengineering Dissertations

Perception of pain is multi-dimensional, comprising three major psychological dimensions: sensory-discriminative, motivational-affective and cognitive-evaluative. This dissertation study investigates the cognitive evaluation of pain, by acquiring functional Near Infra-Red Spectroscopic (fNIRS) measurements from the prefrontal cortex (PFC) areas, during mechanical and thermal pain stimulation induced on the subject's volar forearm. Clustered-wise analysis on the oxy-hemoglobin (HbO) response from specific PFC areas was followed by categorizing the resulting HbO response into early (0.1-12sec) and late (12.1-25sec) phases. For each respective phase, regression analysis was carried between the HbO-derived parameters and behaviorally measured pain rating. The major findings of this study include: (1) …

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