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Electromagnetic Wave Scattering From Vegetation, Xiaoyan Huang Aug 2006

Electromagnetic Wave Scattering From Vegetation, Xiaoyan Huang

Electrical Engineering Dissertations - Archive

This dissertation contains the theoretical study of microwave scattering from vegetated media and the development of microwave scattering models with applications to these media. A vegetation canopy may consist of deciduous or coniferous leaves, branches, and trunks with certain size and orientation distributions. The formulation of the scattering model for each element of the canopy is carried out and its scatter patterns versus its size and orientation for like and cross polarizations are computed and presented. In particular, an extension is made where vegetation with a compound-leaf pattern is considered. For this type of vegetation, several leaves that form a …

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Evaluating Indexing And Routing Schemes For Spatial Queries In Sensor Networks, Raja Rajeshwari Anugula Aug 2006

Evaluating Indexing And Routing Schemes For Spatial Queries In Sensor Networks, Raja Rajeshwari Anugula

Computer Science and Engineering Theses - Archive

Recent advances in low-power sensing devices coupled with widespread availability of wireless ad-hoc networks, has fueled the development of sensor networks. These senor networks have various applications such as to monitor conditions at different locations (temperature, pressure, rainfall, vibrations etc.,), tracking of objects and so on. Each device is equipped with an energy source (usually with a battery), memory, CPU and communication bandwidth, which is severely constrained. Hence each sensor network is comprised of hardware for sensing, software for communication and computational algorithms. Spatial queries are commonly applied to sensor network, for example: "Find the highest temperature sensed in a …

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Device Level Vacuum Packaged Microbolometers On Flexible Substrates, Aamer Mahmood Aug 2006

Device Level Vacuum Packaged Microbolometers On Flexible Substrates, Aamer Mahmood

Electrical Engineering Dissertations - Archive

Micromachined microbolometers on flexible substrate have been fabricated and characterized. Liquid polyimide PI5878G made by HD Microsystems has been used to form the flexible substrate. Semiconducting Yttrium-Barium-Copper-Oxide (commonly referred to as YBCO) is the temperature sensitive material. These detectors are supported by thin micromachined layers of silicon nitride on flexible polyimide PI5878G. The devices were characterized for temperature dependent resistance (R(T)), the temperature coefficient of resistance (TCR, ), responsivity , detectivity (D*) and thermal conductance (Gth). A typical device had a resistance of 3.76 MI and a TCR of -2.63 %/K at 301 K. The measured thermal conductance was W/K. …

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An Application Of Parallel And Distributed Computing Methods To Approximate Pattern Matching Of Genetic Regulatory Motifs, Tushar Kumar Jayantilal Aug 2006

An Application Of Parallel And Distributed Computing Methods To Approximate Pattern Matching Of Genetic Regulatory Motifs, Tushar Kumar Jayantilal

Computer Science and Engineering Theses - Archive

Bioinformatics is a relatively new scientific field concerned with providing computational means and support to research in molecular biology and genetics. It draws from many different areas of computer science, including database theory, algorithm design and analysis, and artificial intelligence, to name just a few. In many applications, such as one described in this thesis, a biologist is interested in locating a particular pattern, or sequence motif, in a given string or set of strings over the four-letter DNA alphabet. In this thesis we present an efficient approach to locating promoter and other regulatory sequences in entire genomes or in …

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Nonlinear Control Of Microelectromechanical Systems (Mems) Devices, Kwadwo Osei Owusu Aug 2006

Nonlinear Control Of Microelectromechanical Systems (Mems) Devices, Kwadwo Osei Owusu

Electrical Engineering Theses - Archive

Different actuation principles have been developed for MEMS but electrostatic actuators are the most common. A significant drawback in the use of electrostatic actuators for some applications is their nonlinear voltage to position characteristics. Analog operation of these devices requires the use of feedback to stabilize and linearize them. Controlling and optimizing the operation of electrostatic controllers using feedback requires the establishment of the complete and accurate dynamical model of the device. In this thesis, we show how an optical switch driven by a MEMS electrostatic comb drive is controlled to guarantee its performance, stability and reliability for use in …

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3d Interconnects For Die And Wafer Stacks, Rachita Dewan Aug 2006

3d Interconnects For Die And Wafer Stacks, Rachita Dewan

Electrical Engineering Theses - Archive

3D integration results from the ever demanding trend towards smaller and lower-profile, lighter and lower cost packaged devices requires further package miniaturization. With the present System-on-chip (SOC) technology reaching its limitation in terms of functionality and cost, effort are being concentrated on exploring the third dimension, i.e. 3D integration. It provides a volumetric packaging solution for higher integration and performance and results in size and weight reduction. Approaches to achieve 3D integration are die and wafer stacking. A key technology to realize the potential of stacking is implementation of vertical electrical interconnects between die and wafer stacks. This thesis discusses …

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The Design And Analysis Of Optical Scanners For Optical Coherence Tomography, Naresh Dhaubanjar Aug 2006

The Design And Analysis Of Optical Scanners For Optical Coherence Tomography, Naresh Dhaubanjar

Electrical Engineering Theses - Archive

A miniature fiber optic scanner capable of two-dimensional scanning for medical imaging is designed and developed. The scanner is actuated externally using an electromagnet. Nickel gel, a soft ferromagnetic material, is coated on the optical fiber. The performance of the scanner is characterized. Finite element analysis is performed to validate the theoretical and experimental results. A design and analysis of a cantilever type electrostatic zipping actuator and a bidirectional vertical thermal actuator are presented. The actuation principle, lumped modeling analysis, experimental results, and finite element analysis of both actuators are presented. The actuators are characterized statically and dynamically using the …

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Modeling And Performance Evaluation Of A Power Electronic-Based Controlled Fuel Cell System, Yashar Ehsan Kenarangui Aug 2006

Modeling And Performance Evaluation Of A Power Electronic-Based Controlled Fuel Cell System, Yashar Ehsan Kenarangui

Electrical Engineering Theses - Archive

In fuel cell applications, design of an appropriate controller and selection of an Ultra-Capacitor require a suitable model of fuel-cell-systems that can adequately represent the significant characteristics of the system. Such a model, using lumped circuit elements, was developed in this thesis via a simple method without requiring fuel cell design parameters. To validate the model, simulation results from the model were compared against the results from experimental setups and satisfactory results were obtained. Later, this model was used in order to design a controller that meets the control objectives, namely, regulation of output voltage and attenuation of load current …

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Population Genetics Of Phanaeus Vindex And P. Difformis And Congruence With Morphology Across A Geographic Zone Of Species Overlap, Aaron Michael Dickey Aug 2006

Population Genetics Of Phanaeus Vindex And P. Difformis And Congruence With Morphology Across A Geographic Zone Of Species Overlap, Aaron Michael Dickey

Biology Theses - Archive

Amplified Fragment Length Polymorphisms (AFLPs) reveal that the rainbow scarabs Phanaeus vindex (MacLeay) and Phanaeus difformis (LeConte) are distinct evolutionary units which occur in sympatry at the Fort Worth Nature Center. The genetic structure at this location is distinctly bimodal with strong segregation of taxa based on soil type. In addition, certain allele frequencies within P. vindex locations exhibited a significant correlation with a precipitation gradient and other allele frequencies within P. vindex locations were significantly different on loam soil than on both sand and clay soils. Phanaeus vindex and P. difformis exhibit continuous morphological character states between two extremes, …

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Intersections Of Special Education Law And Juvenile Justice Policy And Practice, Katie Cadigan Aug 2006

Intersections Of Special Education Law And Juvenile Justice Policy And Practice, Katie Cadigan

Sociology & Anthropology Theses - Archive

The purpose of this research is threefold: to summarize law as it relates to youth with disabilities in juvenile justice facilities; to synthesize existing literature hypothesizing explanations for the disproportionate numbers of youth with disabilities involved with the juvenile justice system and proposing effective educational programs to serve those youth; and to discover the ways in which the educational programs and policy and procedures of two juvenile justice facilities both correspond with and contradict literature recommendations and special education law. Special education legislative documents, policy and procedure manuals for two juvenile justice facilities and personal reflections of my employment experiences …

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Experimental Investigations On Small-Strain Stiffness Properties Of Partially Saturated Soils Via Resonant Column And Bender Element Testing, Phayak Takkabutr Aug 2006

Experimental Investigations On Small-Strain Stiffness Properties Of Partially Saturated Soils Via Resonant Column And Bender Element Testing, Phayak Takkabutr

Civil Engineering Dissertations - Archive

A comprehensive series of resonant column (ASTM D 2325-68), bender element (ASTM C 778), pressure plate (ASTM D 4015-92), and filter paper (ASTM D 5298) tests were conducted on compacted specimens of poorly graded sand (SP) and high plasticity clay (CH) in order to assess the influence of key environmental factors, namely compaction-induced matric suction and Ko stress state, on small-strain stiffness properties of partially saturated soils. Compaction-induced matric suction in all test specimens was estimated via soil-water characteristic curves (SWCC) for each type of soil. The research work was accomplished in six broad stages. During Stage I, a modified …

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Mode Choice Models For Long Distance Travel In Usa, Isaradatta Rasmidatta Aug 2006

Mode Choice Models For Long Distance Travel In Usa, Isaradatta Rasmidatta

Civil Engineering Dissertations - Archive

The influences of technology and economic development on human activity are increasingly taking place on larger spatial scales. As a consequence, complementary interactions between urban regions are getting stronger, which causes urban regions to change. In order to stimulate the integration between regions and states level, policy makers need increased knowledge of the factors that influence long distance travel. From an environmental perspective, long distance trips can be very important because most of the trips are made in personal vehicles or airplanes that affect emissions and fuel consumption. Mode choice alternatives for long distance travel include: personal vehicle, air, and …

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Determinants Of Adverse Usage Of Information Systems Assets: A Study Of Antecedents Of Is Exploit In Organizations, Aakash Taneja Aug 2006

Determinants Of Adverse Usage Of Information Systems Assets: A Study Of Antecedents Of Is Exploit In Organizations, Aakash Taneja

Business Administration Dissertations - Archive

Information systems assets are vital to the functioning and survival of organizations. Therefore, organizations expend many resources in protecting these assets. Organizations spent resources on technologies, policies, procedures, guidelines, user awareness, education, training and other protection mechanisms. Advancing technology and complexity of organizations make the protection of these assets a continuing challenge. Studies show that in spite of these efforts, the main reason for security failures in organizations is due to human behavior (Stanton et al. 2004). This study speaks for an enhanced behavioral model for the adverse usage of IS assets and addresses the factors that influence these behaviors. …

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Statistical Modeling Approach To Airline Revenue Management With Overbooking, Sheela Siddappa Aug 2006

Statistical Modeling Approach To Airline Revenue Management With Overbooking, Sheela Siddappa

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

A Revenue Management (RM) method in the airline industry plays a very important role in maximizing revenue under various uncertainty issues, like customer demand, the number of seats to be maintained in inventory, the number of seats to be overbooked, etc. In this dissertation, a Markov decision process (MDP) based approach using statistical modeling is presented. Prior versions of this statistical modeling approach have employed remaining seat capacity ranges from zero to the capacity of the aircraft. In reality, actual remaining capacities are near capacity when the booking process begins and near zero when the flights depart. Thus, our modified …

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The Kite Runner: A Background Resource For Readers, Laurin Porter, Evelyn Barker, C. D. Walter Aug 2006

The Kite Runner: A Background Resource For Readers, Laurin Porter, Evelyn Barker, C. D. Walter

Information Literacy Resources-Archive

No abstract provided.

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The Value Of Customer Co-Production In Developing New Products, Samar Mohammad Baqer Aug 2006

The Value Of Customer Co-Production In Developing New Products, Samar Mohammad Baqer

Marketing Dissertations - Archive

The concept of customer co-production has been mentioned in the marketing literature on several occasions. The lack of a clear definition and the poor operationalization in previous literature stimulated the interest to investigate it as a growing marketing concept. This dissertation investigated the perceived value of co-production in developing new products and found that it has an influence on customers' symbolic and functional reasons for purchase. In addition, the moderating effects of business communications and customers being classified classification as early adopters of innovation were found to be significant.

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Use Of Temperature Sensitive Mutants To Map Reovirus Induced Oncolysis, Ka Ian Tam Aug 2006

Use Of Temperature Sensitive Mutants To Map Reovirus Induced Oncolysis, Ka Ian Tam

Biology Theses - Archive

Reovirus is known to establish persistent infections in normal cells while selectively destroying transformed cells. Individual viruses from each of the ten groups of Reovirus is known to establish persistent infections in normal cells while selectively destroying transformed cells. Individual viruses from each of the ten groups of Reovirus temperature sensitive mutants were used to examine the gene or genes involved in the differential lysis activity. Temperature sensitive mutants were generated by chemical mutagenesis and have one of the ten genes impaired when growing at the non-permissive temperature, while they behave like wild type when growing at the permissive temperature. …

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Parameters Affecting Critical Heat Flux Of Nanofluids: Heater Size, Pressure Orientation And Anti-Freeze Addition, Madhav Rao Kashinath Aug 2006

Parameters Affecting Critical Heat Flux Of Nanofluids: Heater Size, Pressure Orientation And Anti-Freeze Addition, Madhav Rao Kashinath

Mechanical and Aerospace Engineering Theses - Archive

This research aims at investigating the effect, heater size, pressure, heater orientation and effect of anti-freeze addition on critical heat flux of nanofluids which have shown large potentials as coolants for high power generating uses. Nanofluids have shown about ~180 - 200% enhancement in the critical heat flux values. The effect of heater size employing three different sized heaters yielded about ~180% enhancement over pure water. The effect of pressure on critical heat flux investigated by testing nanofluids at three pressures showed ~240% increase in critical heat flux. Surface orientation effect on critical heat flux carried out for a 2 …

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"Invasion" Of The Poor: Beliefs And Attitudes Of The Receiving Community, Joanna Duke Aug 2006

"Invasion" Of The Poor: Beliefs And Attitudes Of The Receiving Community, Joanna Duke

Public Affairs Dissertations - Archive

Housing policy as one of the tools for eradicating poverty remains a critical arena for debate, especially in light of the dire situation of impoverished inner cities and growing inequalities between communities in the U.S. Policies aimed towards ameliorating the negative effects of these inequalities on impecunious residents include deconcentrating poverty through the dispersion of public housing residents into more affluent neighborhoods. The logic behind this approach is the assumption that removing barriers and obstacles from low income families by integrating them into middle class neighborhoods will increase the life chances of the low income families. These policies are often …

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"Invasion" Of The Poor: Beliefs And Attitudes Of The Receiving Community, Joanna Duke Aug 2006

"Invasion" Of The Poor: Beliefs And Attitudes Of The Receiving Community, Joanna Duke

Public Affairs Dissertations - Archive

Housing policy as one of the tools for eradicating poverty remains a critical arena for debate, especially in light of the dire situation of impoverished inner cities and growing inequalities between communities in the U.S. Policies aimed towards ameliorating the negative effects of these inequalities on impecunious residents include deconcentrating poverty through the dispersion of public housing residents into more affluent neighborhoods. The logic behind this approach is the assumption that removing barriers and obstacles from low income families by integrating them into middle class neighborhoods will increase the life chances of the low income families. These policies are often …

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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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Are Socially Dominant Men More Facially Dominant And More Prone To Sexual Jealousy?, Chawki Ahmed Belhadi Aug 2006

Are Socially Dominant Men More Facially Dominant And More Prone To Sexual Jealousy?, Chawki Ahmed Belhadi

Psychology Theses - Archive

Previous studies show that men with masculine facial characteristics are perceived as more dominant than men with less masculine facial characteristics. This study investigated whether facially dominant men behaved more dominantly and were more prone to sexual jealousy. Participants were 115 males enrolled in UTA introductory psychology classes. Dominant behavior constituted the number of times participants stuck to their position in a series of cooperative decision making trials; sexual jealousy was measured using a modification of Buss et al's. (1992) jealousy scenario, and facial dominance was measured using subjective ratings. Results indicated a significant positive correlation between facial dominance and …

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Constitutionalism, Social Democracy, And Nationalism, And The First Communist Movement In Iran, 1905-1921, Bradley Jahan Borougerdi Aug 2006

Constitutionalism, Social Democracy, And Nationalism, And The First Communist Movement In Iran, 1905-1921, Bradley Jahan Borougerdi

History Theses - Archive

Western expansion into Iran during the latter half of the nineteenth century had a significant impact on the country's social, economic, and political development. By the turn of the century, Western ideas of constitutionalism and social democracy had infiltrated Persian society, which set the foundation for modern revolutionary movements to emerge and challenge the traditional social and political order of Persian society. This thesis analyzes the revolutionary movements in Iran during the first two decades of the twentieth century and argues that the failure of these movements can be attributed to internal factionalism in Persian politics and foreign involvement on …

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Development Of Three Block Thermal Compact Model And Verification Of Modified Linear Superposition Technique For Stacked Die, Suresh G. Nikalaje Aug 2006

Development Of Three Block Thermal Compact Model And Verification Of Modified Linear Superposition Technique For Stacked Die, Suresh G. Nikalaje

Mechanical and Aerospace Engineering Theses - Archive

Over the last few years an impressive amount of progress has been achieved in the field of compact modeling of chip packages. But available compact modeling methods could not address the issue of limitation on the mesh statistics which is major concern while modeling in FEM softwares with limited number of nodes and elements. It is not possible to attain convergence of solution for thermal simulation of detailed model with the constraint on the number of nodes and elements. In this thesis, a simple and straight forward three block (3B) compact modeling method is developed. 3B compact modeling method has …

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Investigation Of Bamboo As Reinforcement In Concrete, Youngsi Jung Aug 2006

Investigation Of Bamboo As Reinforcement In Concrete, Youngsi Jung

Civil Engineering Theses - Archive

This study investigated the feasibility of using bamboo as a reinforcement alternative to steel in concrete structural members. The specifications studied were the bamboo's tensile strength and its pullout characteristics in concrete. Two types of bamboo, Solid and Moso, were used for tensile testing. The tensile test specimens were prepared with different lengths, 6 in (152 mm) and 12 in (304 mm), and different physical characteristics (with and without nodes). Tensile test specimens were tested to failure and their load deformation characteristics are reported. The failures of the test specimens were identified as: (1) node failure; (2) splitting failure; and …

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Novel Preparation Of Polymeric Scaffolds For Tissue Engineering Using Phase Separation With Protein Microbubble Incorporation, Ashwin Nair Aug 2006

Novel Preparation Of Polymeric Scaffolds For Tissue Engineering Using Phase Separation With Protein Microbubble Incorporation, Ashwin Nair

Bioengineering Theses - Archive

Poly (lactic-co-glycolic acid) (PLGA) has been extensively used as a biodegradable and porous tissue scaffold due to their biocompatibility and degradability. Several techniques have been developed for the fabrication of polymeric scaffolds but they all have some limitation or the other which has in turn hampered the growth of cells seeded on them. Salt leached scaffolds have good porosity and large pores but poor mechanical strength and the problem of residual salt even after leaching. Similarly gas foaming scaffolds have shown large pores but poor interconnection with residual ammonium salts. Other methods like thermally induced phase separation and fiber bonding …

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Use Of Near Infrared And Visible Spectroscopies To Determine Optical Properties Of Rat Nervous System, Harsha Radhakrishnan Aug 2006

Use Of Near Infrared And Visible Spectroscopies To Determine Optical Properties Of Rat Nervous System, Harsha Radhakrishnan

Bioengineering Theses - Archive

Changes to the anatomical or physiological structure of the neuronal circuitry are known to produce a change in the optical properties of the tissue under investigation. The goal of this thesis is to determine changes in the light scattering and hemoglobin oxygen saturation in three cases: (i) a normal spinal cord, (ii) demyelinated sciatic nerve, and (iii) spinal cord under neuronal activity induced by peripheral electrical stimulation. We hypothesize that (i) nerve demyelination or degeneration would result in a decrease in light scattering and hemoglobin oxygen saturation and (ii) peripheral electrical stimulation would show an increase in light scattering and …

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Friends Of The Ut Arlington Library - Highlights 2006-2007, Margaret Dwyer Aug 2006

Friends Of The Ut Arlington Library - Highlights 2006-2007, Margaret Dwyer

UTA Libraries Staff Publications - Archive

Those who are looking for an opportunity to exercise their brains and socialize need look no further than joining Arlington's Smart Set: the Friends of the UT Arlington Library. Chartered in 1987, the Friends is an organization committed to enhancing the resources of the Library system at UT Arlington. The Academic Calendar dictates our scheduled events. Running from September to May, we hold at least six meetings a year. Members attend talks, usually by regional authors, that further their awareness and appreciation of the Library while contributing to the enrichment of its collections and services as members of this unique …

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News You Can Use, University Of Texas At Arlington Library Aug 2006

News You Can Use, University Of Texas At Arlington Library

News You Can Use

No abstract provided.

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A Relational Database Approach For Frequent Subgraph Mining, Subhesh Kumar Pradhan Jul 2006

A Relational Database Approach For Frequent Subgraph Mining, Subhesh Kumar Pradhan

Computer Science and Engineering Theses - Archive

Data mining aims at discovering interesting and previously unknown patterns from data sets. Further more, graph-based data mining represents a collection of techniques for mining the relational aspects of data represented as a graph. Complex relationships in data can be represented using graphs and hence graph mining is appropriate for analyzing data that is rich in structural relationships. Database mining of graphs, on the other hand, aims at directly mining graphs stored in a database using SQL queries. Several SQL-based mining algorithms have been developed successfully and their efficiency and scalability have been established. One of them is HDB-Subdue which …

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