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Effectiveness Of Signal Coordination As An Emission Reduction Measure For Vehicles, Rajashi I. Parikh Aug 2006

Effectiveness Of Signal Coordination As An Emission Reduction Measure For Vehicles, Rajashi I. Parikh

Civil Engineering Theses - Archive

Air Pollution is a significant health and environmental concern. Vehicular emissions are major contributors to many air pollution problems. There is growing interest in reducing carbon dioxide emission because of the alarming increase in the pollution caused by petroleum resulting global warming issue. Various studies have found that U.S vehicles emit half of the CO2 emitted from vehicle all over the world. Dallas Fort Worth is a non-attainment area for ozone and it is required to achieve NAAQS standards by 2010. NOx and VOCs from the automobile are a major precursor of ozone formation in the atmosphere. Traffic signal retiming …

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Assessment Of Soil-Water Retention Properties Of Lime And Cement Treated Clays, Harshavardhan Reddy Thudi Aug 2006

Assessment Of Soil-Water Retention Properties Of Lime And Cement Treated Clays, Harshavardhan Reddy Thudi

Civil Engineering Theses - Archive

The soil-water characteristic curve (SWCC) of unsaturated soils has considerable importance in the analysis of geotechnical engineering problems involving soils that remain under partially saturated conditions throughout any given year. The SWCC reflects the behavior of unsaturated soils with regard to its hydraulic conductivity, shear strength, and volume change behavior. Numerous investigations have been undertaken in recent decades to extend the unsaturated soil mechanics principles into conventional engineering practice. The soil-water characteristic curve (SWCC) has become a widely used experimental means for assessing fundamental properties of unsaturated soils for a wide range of suction values. However, a limited number of …

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Optimization Of Hydrogen Filling Station, Vishal Bhan Aug 2006

Optimization Of Hydrogen Filling Station, Vishal Bhan

Electrical Engineering Theses - Archive

After experiencing the price hikes in the fuel and electricity, renewable energy is considered as one of the most attractive alternatives for future utility industry. Also, Hydrogen via renewable energy is of interest due to the environmental concern when compared with traditional fossil fuels. The Energy Bill of 2005 has included an authorization of $3.7 billion for hydrogen and fuel cell research and development. Further, hydrogen fuel cell vehicles (FCVs) are currently in the pre-production stage of development and the infrastructure needs to support them. Hence to overcome issues like price hike, exhaustion of crude oil and to gain appreciation …

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Emulation Of Asic Based Network Processor On A Fpga Platform, Sharada Vajja Aug 2006

Emulation Of Asic Based Network Processor On A Fpga Platform, Sharada Vajja

Electrical Engineering Theses - Archive

ABSTRACT Exponential increase of device sizes and complexity of ASICs mandate the need for design verification to meet timing specifications and functionality requirements. Verification techniques are broadly implemented in three categories viz., simulation, verification using commercial emulators and FPGA based prototyping. An Intel architecture based network processor, to be taped out in the near future, is being emulated on FPGA based platform. The basic blocks of the Network Processor, for instance, the Memory Controller Hub and I/O controller Hub were synthesized to be configured on FPGAs. The work involved synthesizing the design, partitioning it on multiple FPGAs and pin multiplexing …

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Mitigation Of Window Effects In Inverse Synthetic Aperture Radar (Isar) Imagery Using Multi-Resolution Technique, Suman Kumar Gunnala Aug 2006

Mitigation Of Window Effects In Inverse Synthetic Aperture Radar (Isar) Imagery Using Multi-Resolution Technique, Suman Kumar Gunnala

Electrical Engineering Theses - Archive

A method using Multi-Resolution technique for window effect mitigation in ISAR imagery, which occurs due to finite extent data, is presented in this work. Proposed method is supported with quantitative measure using both Structural Similarity (SSIM) and Mean Square Error (MSE). In addition, above index measures were used to determine the best choice of wavelet basis for window effect mitigation. Complete angular window and partial angular window are used as two cases to demonstrate the validation of above contributions. Scattering measurements of different test sets were done to validate the approach. Results which include reconstructed images and quantitative index measures …

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Investigation Of The Suitability Of The Biscatecholborate Anion As A Reductive Quencher For Photoexcited Ruthenium Polyphyridyl Complexes, Alper Yarasik Aug 2006

Investigation Of The Suitability Of The Biscatecholborate Anion As A Reductive Quencher For Photoexcited Ruthenium Polyphyridyl Complexes, Alper Yarasik

Chemistry & Biochemistry Theses - Archive

Ruthenium polypyridyl complexes [Ru(L-L)3]2+, (L-L = 1,10 - phenanthroline or 2,2'- bipyridine) which covalently linked to electron donor or acceptor units are frequently used in artificial photosystems because of their high emission quantum yields, long excited-state lifetimes, favorable redox properties and excellent chemical stability. The ruthenium dimer P, [(phen)2Ru(tatpp)Ru(phen)2][PF6]4, undergoes multiple photoreductions in the presence of donors such as triethylamine (TEA); however, large amount of donors (0.3 M) are required for efficient reductions. This explores the use of a anionic donor such as [B(cat)2]- with the hypothesis that ion-pairing will result in lower required concentration of the donor. Electrochemical data …

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Generalization And Enforcement Of Role-Based Access Control Using A Novel Event-Based Approach, Raman Adaikkalavan Aug 2006

Generalization And Enforcement Of Role-Based Access Control Using A Novel Event-Based Approach, Raman Adaikkalavan

Computer Science and Engineering Dissertations - Archive

Protecting information against unauthorized access is a key issue in information system security. Advanced access control models and mechanisms have now become necessary for applications and systems due to emerging acts, such as the Health Insurance Portability and Accountability Act (HIPAA) and the Sarbanes-Oxley Act. Role-Based Access Control (RBAC) is a viable alternative to traditional discretionary and mandatory access control. RBAC has been shown to be cost effective and is being employed in various application domains on account of its characteristics: rich specification, policy neutrality, separation of duty relations, principle of least privilege, and ease of management. Existing RBAC approaches …

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Learning State And Action Space Hierarchies For Reinforcement Learning Using Action-Dependent Partitioning, Mehran Asadi Aug 2006

Learning State And Action Space Hierarchies For Reinforcement Learning Using Action-Dependent Partitioning, Mehran Asadi

Computer Science and Engineering Dissertations - Archive

Autonomous systems are often dicult to program. Reinforcement learning (RL) is an attractive alternative, as it allows the agent to learn behavior on the basis of sparse, delayed reward signals provided only when the agent reaches desired goals. Recent attempts to address the dimensionality of RL have turned to principled ways of exploiting temporal abstraction, where decisions are not required at each step, but rather invoke the execution of temporally-extended activities which follow their own policies un- til termination. This leads naturally to hierarchical control architectures and associated learning algorithms. This dissertation reviews several approaches to temporal abstraction and hierarchical …

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Evidence For A Simpatico Self-Schema In Studies Comparing Hispanics And Whites, Renee Holloway Aug 2006

Evidence For A Simpatico Self-Schema In Studies Comparing Hispanics And Whites, Renee Holloway

Psychology Dissertations - Archive

Considerable evidence exists that many Latin American cultures emphasize concept of simpatia or simpatico (Triandis, Martin, Lisansky, & Betancourt, 1984). The purpose of this research project was to test for evidence that Mexican-Americans use a simpatico self-schema more than White Americans do. Study 1 assessed the participants' reported self-schemas using the "Who am I?" paradigm (Gordon, 1968). As predicted, the Hispanic participants reported significantly more simpatico-related terms in their self-descriptions than the White participants. Study 2 also assessed the self-schema of the participants, using a traditional cognitive paradigm (Markus, 1977). However, none of the predicted hypotheses for that study were …

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Analysis And Optimal Design Of Beams Using Radial Basis Function, Yung-Kang Sun Aug 2006

Analysis And Optimal Design Of Beams Using Radial Basis Function, Yung-Kang Sun

Mechanical and Aerospace Engineering Dissertations - Archive

The application of Multiquadric Radial Basis Function (MQ RBF) in the analysis and optimal design of beams are addressed in this dissertation. For static analysis, a new Least Square Collocation (LSC) method is introduced. For buckling and vibration analysis, Rayleigh-Ritz analysis procedures are presented using MQ RBF basis function. Numerical results show that LSC can provide better results than the classical collocation method when the same number of collocation points are used. In vibration analysis, MQ RBF-based Rayleigh-Ritz can be used to calculate natural frequency accurately for several hundred modes. The important question of choosing shift parameters is discussed and …

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Enhancement Of Cryoinjury By Use Of Eutectic Crystallization Of An Amino Acid Adjuvant, Chuo-Li Wang Aug 2006

Enhancement Of Cryoinjury By Use Of Eutectic Crystallization Of An Amino Acid Adjuvant, Chuo-Li Wang

Mechanical and Aerospace Engineering Theses - Archive

Enhancement of cryoinjury by use of eutectic formation was investigated to improve the efficacy of cryosurgery. Although the enhancement of cryoinjury associated with eutectic crystallization of sodium chloride (NaCl) has been demonstrated, its advantage can be maximized with adjuvants which are biocompatible and have higher eutectic temperature than NaCl. In this study, the feasibility of glycine, which is less toxic and have higher eutectic temperature than NaCl, was tested. Two groups of MCF-7 human breast cancer cell were suspended in isotonic saline with glycine, then were frozen and thawed on a directional solidification stage in the same protocol except that …

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Novel Approaches To Photoassisted Deposition Of Semiconductors And Nanocomposite Materials, Sashikala Somasundaram Aug 2006

Novel Approaches To Photoassisted Deposition Of Semiconductors And Nanocomposite Materials, Sashikala Somasundaram

Chemistry & Biochemistry Dissertations - Archive

This dissertation research begins with the use of TiO2-based photocatalysis for the reduction of metal ions with very negative reduction potentials. The indirect photocatalytic reduction of four metal ions: Cd2+, Zn2+, Mn2+, and Tl+ using formate radical anions generated in UV-irradiated aqueous TiO2 suspensions, is described. Using Tl+ as a model metal ion, a simple kinetics scheme was developed for the indirect reduction route, and the predictions from this model were shown to be in excellent agreement with experimental data. Titania-based photocatalysis was then used for the preparation of MSe/TiO2 "coupled" semiconductors. Heterogeneous photocatalysis using photoexcited TiO2 substrates was shown …

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Hourly Weather Forecast Analysis, Sothaya Rasmidatta Aug 2006

Hourly Weather Forecast Analysis, Sothaya Rasmidatta

Electrical Engineering Theses - Archive

Today, internet becomes one of the most important resources for useful information. However, since the authentic of the information is difficult to verify, one also has to take precaution when getting information from the internet. Utility companies need to forecast their load for unit commitment scheduling and system planning. The traditional approach for neural network forecasting relies on the temperature forecasting information from a single source. The customer loads are closely correlated with the temperature. Therefore, the accuracy of the load forecasting is affected by the temperature forecasting errors. The objective of this thesis is to reduce the temperature forecasting …

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Novel Techniques Of Fabricating Porous, Biodegradable Polymer Scaffolds For Sustained Drug Release, Mayur B. Uttarwar Aug 2006

Novel Techniques Of Fabricating Porous, Biodegradable Polymer Scaffolds For Sustained Drug Release, Mayur B. Uttarwar

Bioengineering Theses - Archive

Two types of porous scaffolds were made from biodegradable polymers and their drug release trends and rates were studied. In first method, the emulsion of PLLA in chloroform solution and PVA and acetaminophen in de-ionized water solution was made. The emulsion was blended with PLLA solution. The resultant emulsion was freeze vacuum dried. The drug release study was conducted in-vitro. In the second method, scaffolds had three layers. The top and bottom layers were made by blending PLLA solution with PVA solution. The middle layer was made by blending PLLA solution with a mixture of PVA and Acetaminophen in de-ionized …

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Drug Loaded Polymeric Blends For Developing Vascular Stents, Anup C. Dasnurkar Aug 2006

Drug Loaded Polymeric Blends For Developing Vascular Stents, Anup C. Dasnurkar

Bioengineering Theses - Archive

In-stent restenosis and neo-intimal hyperplasia are long-term limitations of metallic stents. Local delivery of medications to transluminal angioplasty sites to prevent restenosis is receiving worldwide attention. Development of localized application of antiproliferative agents, and gene therapy via bio-degradable coatings on metallic substrates proved to be successful in reducing restenosis but was limited by the problems of limited drug load, etc. The presence of a foreign object for a long period of time may lead to the further narrowing of the treated lesion. The rationale for usage of bioresorbable drug eluting stents is the ability to store large quantities of drug …

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Development Of An In-Vitro Assay For Neurotrophin-Induced Segregation Of Nociceptive And Proprioceptive Sensory Axons, Ebrahim Shabbir Bengali Aug 2006

Development Of An In-Vitro Assay For Neurotrophin-Induced Segregation Of Nociceptive And Proprioceptive Sensory Axons, Ebrahim Shabbir Bengali

Bioengineering Theses - Archive

Peripheral nerves have the capacity for regeneration and if properly repaired, axon extensions can regenerate even across gaps caused by peripheral nerve loss. Complete functional recovery after gap injury repair remains suboptimal due to the erroneous pathways taken by the regenerating axons leading to aberrant target innervation. A segregation of axonal types can facilitate efficient target direction and innervation leading to improved functional recovery. Novel two-dimensional and three-dimensional Y-shaped assays were developed to test whether the nociceptive and proprioceptive sensory axons from the dorsal root ganglia could be segregated through specific neurotrophin inducement; namely NGF and NT-3 respectively. A large …

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Development Of Targeting Nanoparticles Mimicking The Adhesive Properties Of Platelets, Arthur Lin Aug 2006

Development Of Targeting Nanoparticles Mimicking The Adhesive Properties Of Platelets, Arthur Lin

Bioengineering Theses - Archive

The development of biodegradable nanoparticles as drug delivery vehicles presents an improved avenue for intracellular targeted drug delivery. Biodegradable nanoparticles have demonstrated an ability to provide controllable, sustained drug release in vitro. However, in vivo studies have shown that nanoparticles are not effective at adhering to vascular walls under shear stress. The purpose of this study was to investigate methods to improve cellular uptake and targeting of nanoparticles in activated or inflamed endothelial cells (ECs) under fluid shear stress and to determine whether the material properties of a biodegradable polymer, poly (lactic-co-glycolic) acid (PLGA), affected cellular uptake. The hypothesis for …

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Anti-Viral Activity Of Quillaja Saponaria Molina Extracts Against Hiv-1 And Hiv-2, Jennifer Lee Sprayberry Aug 2006

Anti-Viral Activity Of Quillaja Saponaria Molina Extracts Against Hiv-1 And Hiv-2, Jennifer Lee Sprayberry

Biology Theses - Archive

It has been well established that extracts from the bark of the South American tree Quillaja saponaria Molina have the capacity to stimulate strong immune responses against exogenous antigen when used as an adjuvant. However, the anti-viral capacity of Q. saponins has not been well established. We document the anti-viral capacity of Quillaja saponaria extracts against HIV-1 and HIV-2. The extract appeared to interact with the gp120 subunit of HIV-1 and HIV-2 to produce a low anti-viral effect by blocking viral attachment. The extract was also observed to coat cells in a time dependent manner and block attachment to CD4 …

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General Response Of Kneading-Compacted Unsaturated Silty Sand Under Drained And Undrained True Triaxial Testing, Sangchul Pyo Aug 2006

General Response Of Kneading-Compacted Unsaturated Silty Sand Under Drained And Undrained True Triaxial Testing, Sangchul Pyo

Civil Engineering Theses - Archive

A comprehensive series of 36 drained and 36 undrained true triaxial tests was accomplished to investigate the stress-strain-strength behaviour of kneading-compacted unsaturated silty sand (SP-SM) under multi-axial stress states. Test specimens were prepared at three different initial moist contents (6, 8, 10%) to achieve different compaction-induced suction conditions prior to testing. All samples were then subjected to either a drained or undrained multi-axial stress paths, including conventional triaxial compression (CTC), triaxial compression (TC), triaxial extension (TE), or simple shear (SS) stress path. Initial compaction-induced matric suction was assessed via the SWCC of test soil. The experimental program focuses on soil …

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Photocatalytic Degradation Of Vocs, Toxics And Odors From Air Emissions Of Wastewater Treatment Plants And Municipal Solid Waste Landfills, Mita Suresh Upadhyay Aug 2006

Photocatalytic Degradation Of Vocs, Toxics And Odors From Air Emissions Of Wastewater Treatment Plants And Municipal Solid Waste Landfills, Mita Suresh Upadhyay

Civil Engineering Theses - Archive

The 1990 Clean Air Act Amendments (CAAA) require more stringent controls of sources of volatile organic compounds (VOCs) and hazardous air pollutants (HAPs). Air quality managers at the state level are responsible for developing State Implementation Plans (SIPs) to improve regional air quality. Both wastewater treatment and landfills facilities are sources of VOCs, HAPs and odors. This research examines the effectiveness of photocatalytic oxidation (PCO) in treating emissions from wastewater and landfill facilities. PCO rate constants of compounds such as methane, o-xylene, m-xylene, p-xylene and carbonyl sulfide are determined over titanium dioxide (TiO2) catalyst in a continuous mixed-batch reactor. The …

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Evaluation Of Resilient Modulus Of Cement And Cement-Fiber Treated Reclaimed Asphalt Pavement (Rap) Aggregates, Ajay Potturi Aug 2006

Evaluation Of Resilient Modulus Of Cement And Cement-Fiber Treated Reclaimed Asphalt Pavement (Rap) Aggregates, Ajay Potturi

Civil Engineering Theses - Archive

Natural aggregates derived from a variety of source rocks have been used as a road base material. But the extraction of natural aggregates resources is increasingly being constrained by urbanization, increased costs and environmental concerns. Thus, increased amounts of reclaimed materials are being used to supplement natural aggregates in road construction. The 1993 EPA report mentioned that approximately 73 million tons of asphalt pavement material was recycled annually, which amounts to about 80% of the asphalt removed from pavements each year. The use of Reclaimed Asphalt Pavement (RAP) materials in road construction reduces both the amount of construction debris disposed …

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Connections: Library News For Library Staff Vol. 3, Issue 8, University Of Texas At Arlington Library Aug 2006

Connections: Library News For Library Staff Vol. 3, Issue 8, 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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The Role Of Cingulate Cortex In Spatial Learning And Pain Processing, Rebecca Weaver Aug 2006

The Role Of Cingulate Cortex In Spatial Learning And Pain Processing, Rebecca Weaver

Psychology Theses - Archive

Research implicates the Anterior Cingulate Cortex (ACC) mediates the affective component of pain processing but not spatial learning. The Posterior Cingulate Cortex (PCC) mediates spatial learning but not pain processes. This study investigated the roles of each cortex in spatial learning and pain processing. Lesions were made using standard stereotaxic procedures on 96 animals. Inflammatory condition was induced via carageenan. Animals were randomly assigned between both MPWT and PEAP followed by Morris Swim Test or vice versa in order to prevent an order effect. As hypothesized, ACC lesioned animals resulted in no spatial learning decrement, but showed no avoidance behavior …

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Recirculating Loop Testbed For All Optical 2r Regeneration, Pallavi Govind Patki Aug 2006

Recirculating Loop Testbed For All Optical 2r Regeneration, Pallavi Govind Patki

Electrical Engineering Theses - Archive

This Master's thesis deals with building a recirculating loop testbed intended for proof-of-principle demonstration of multichannel all-optical 2R regenerator proposed in [1]. The proposed multichannel 2R regeneration scheme uses multiple highly-nonlinear-fiber (HNLF) sections separated by dispersion-compensating periodic-group-delay devices (PGDDs). The high cost and limited availability of these devices restrict us to working with just one PGDD, instead of 16 required by the scheme. Thus, for the proof-of-principle demonstration of the regenerator we have to put a single PGDD and a piece of HNLF into a recirculating loop through which light will circulate for required number of times. In this thesis, …

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Evolution Of Gender Differences In Adult Crying, Carrie Lane Aug 2006

Evolution Of Gender Differences In Adult Crying, Carrie Lane

Psychology Dissertations - Archive

The evolutionary function of gender differences in adult crying was investigated, specifically whether females were selected to cry more than males ostensibly to aid in their survival. Both studies were based on the idea that crying is a signal to others that attention is needed. Study 1 examined how female crying acts as a signal to alert males during a conflict that they have overstepped boundaries, and thus, crying prevents conflict escalation. Study 2 investigated female crying as a signal that requests help and acts as a catalyst in bonding between females, thus strengthening their social networks and increasing their …

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Social Familiarity As A Predictor Of Observational Learning In The Domestic Dog (Canis Familiaris), Lana Gent Aug 2006

Social Familiarity As A Predictor Of Observational Learning In The Domestic Dog (Canis Familiaris), Lana Gent

Psychology Dissertations - Archive

Experiments utilizing observational learning in dogs are becoming more frequent, but few investigate the familiarity relationship between model and observer. Two experiments were designed to explore the familiarity relationship between conspecifics and heterospecifics. The first experiment utilized a heterospecific-conspecific training dynamic and the conditions of the experiment varied how familiar (familiar or unfamiliar) observing dogs were to the heterospecific and conspecific models. Forty-eight dogs were assigned to four conditions varying in familiarity of the human demonstrator and model dog. A separate control condition (n=12) were trained with operant techniques and did not receive demonstration or familiarity variables. Analysis of data …

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Human Trafficking: A Comparative Analysis Of The Perceptions Of College Students And Police Officers, Maria Balderas Aug 2006

Human Trafficking: A Comparative Analysis Of The Perceptions Of College Students And Police Officers, Maria Balderas

Criminology & Criminal Justice Theses - Archive

The purpose of this study is to examine the perception and knowledge of human trafficking in the United States. Specifically, the perception of college students at the University of Texas at Arlington and officers at the Arlington Police Department will be examined by survey. The scope of human trafficking varies depending on the degree of influence it has to a specific situation at a particular time (Seligson, 2005, p.59). Research addressing the deterrence of human trafficking and the response from various agencies will be reviewed (“UN Face Sheet”, 2006). Human trafficking will be reviewed from an international perspective to the …

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Optimization Models For Leishmaniasis Control: A Case For Bihar, India, Kaushik Gorahava Aug 2006

Optimization Models For Leishmaniasis Control: A Case For Bihar, India, Kaushik Gorahava

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Leishmaniasis, is a family of infectious diseases, which mostly affects poor and developing countries. The highest prevalence and mortality rate of Visceral Leishmaniasis (VL) the world over occurs in Bihar state of India. Many disease control methods are available; however, procedures aimed at reducing sandfly population by spraying insecticide have been the most effective for controlling VL in Bihar. In this dissertation, optimization models for the control of Leishmaniasis are developed and analyzed. Novel optimization models are built and analyzed to identify the optimal amount of insecticide allocated for controlling the spread of VL in Bihar. Since the vector (disease …

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Context Aware Energy Conservation In Pervasive Computing Environments, Prathiba Joseph Aug 2006

Context Aware Energy Conservation In Pervasive Computing Environments, Prathiba Joseph

Computer Science and Engineering Theses - Archive

Extending battery lifetime is one of the most critical and challenging problems in mobile systems. When the mobile device sounds a low battery alarm, the user is given an ultimatum to quickly find a power source or suspend work. The greatest utility of mobile devices is their ability to be used anywhere, and at anytime. But power limitations of these devices seem to hinder this goal. The ever-growing needs of mobile users for increased lifetime of wireless devices imply that emerging wireless systems must be more energy-efficient than ever before. Cyber foraging or remote resource exploitation may be an efficient …

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Rf Mems And Integrated Manufacturing For Miniaturized Millimeter-Wave Systems, Ying Cai Aug 2006

Rf Mems And Integrated Manufacturing For Miniaturized Millimeter-Wave Systems, Ying Cai

Electrical Engineering Dissertations - Archive

Recently millimeter-wave systems have attracted more attentions in applications owing to their short wavelengths, high resolutions, broad bandwidths and high environmental tolerance. However, the great challenges of high fabrication and assembly costs, bulky volume, and heavy weight of millimeter-wave systems call for new integrated manufacturing techniques and novel architectures. The micro hot embossing technique integrated with other microfabrication techniques could address these challenges. In this dissertation, the micro plastic hot embossing technique was presented for the fabrication of miniaturized millimeter-wave systems. The micro hot embossing on plastic materials demonstrated its advantages on significant costs, volume, and weight reduction, while maintaining …

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