Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

University of Texas at Arlington

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 13351 - 13380 of 16089

Full-Text Articles in Entire DC Network

Failure Analysis Of Composite Laminates With A Hole By Using Finite Element Method, Moumita Roy Dec 2005

Failure Analysis Of Composite Laminates With A Hole By Using Finite Element Method, Moumita Roy

Mechanical and Aerospace Engineering Theses - Archive

Predicting the strength of a given laminate has been extensively studied. There have been several fracture models proposed but still the immense tests of composite laminates are still needed. Different material systems or lay-ups exhibit different failure modes and failure mechanisms. This thesis focuses in investigation of the failure mechanism of the [±?/02]s and [02/±?]s laminates with a hole. ANSYS finite element models with and without a crack in vicinity of hole were developed to investigate the effect of the stress distribution due to the presence of the angle ply crack. The stress concentrations were obtained. It is found that …

Go to article

Structural Optimization Using Ansys And Regulated Multiquadric Response Surface Model, Ajaykumar Menon Dec 2005

Structural Optimization Using Ansys And Regulated Multiquadric Response Surface Model, Ajaykumar Menon

Mechanical and Aerospace Engineering Theses - Archive

The high computational expense of large non-linear and complex finite element analysis limits or often prohibits the use of conventional codes in engineering design and multidisciplinary optimization. Consequently alternate methods such as Design of experiments (DOE) and Response surface approximation are commonly used to minimize the computational cost of running such analysis and simulation. The basic approach of such methods is to construct a simplified mathematical approximation of the computationally expensive simulation and analysis code, which is then used in place of the original code to facilitate multidisciplinary optimization, design space exploration, reliability analysis etc. When such codes along with …

Go to article

Comparison Of Clinoptilolite With Gravel In A Recirculating Course Media Biofilter Treating Simulated Septic Tank Effluent, Adnan Sadikot Dec 2005

Comparison Of Clinoptilolite With Gravel In A Recirculating Course Media Biofilter Treating Simulated Septic Tank Effluent, Adnan Sadikot

Civil Engineering Theses - Archive

The main objective of the pilot scale study was to compare the performance of recirulating clinoptilolite biofilter with course gravel biofilter used to treat simulated septic tank effluent by simultaneous nitrification and denitrification. For better comparison of performance of total inorganic nitrogen removal and COD removal both the biofilter were chosen of identical size and identical operating conditions were maintained in the laboratory setup. Both the biofilters were operated at recycle ratio of 6 and surface hydraulic loading rate of 7.5 gal/ft2/day without recycle and 52.5 gal/ft2/day with recycle through out the duration of the duration of the research. Results …

Go to article

Effects Of Water-Cement Ratio On Deep Mixing Treated Expansive Clay Characteristics, Siva Prasad Pathivada Dec 2005

Effects Of Water-Cement Ratio On Deep Mixing Treated Expansive Clay Characteristics, Siva Prasad Pathivada

Civil Engineering Theses - Archive

The structures built on the unstabilized expansive soils are subjected to distress due to swell shrink behavior due to seasonal fluctuations. Medium stiff expansive clays with moderate and high PI were collected from two sites located at IH 820 N bound in Fort Worth, Texas. Deep soil mixing technique was proposed as a potential solution to counter the shrink swell movements of the expansive soil. These soils were stabilized using lime and cement as a whole and in combinations at different proportions in laboratory conditions simulating field deep soil mixing. Similar studies performed on soft soils revealed several factors mainly …

Go to article

Numerical Modeling And Analysis Of Pile Supported Embankments, Krishna Nag Rao Dec 2005

Numerical Modeling And Analysis Of Pile Supported Embankments, Krishna Nag Rao

Civil Engineering Theses - Archive

Very soft clays are often avoided in construction due to their low shear strength and high compressibility. Special construction methods are adopted when embankments are constructed on very soft clay or peat. Design of structures on soft ground, where the structure impose large loads onto the ground raises several concerns on factors like bearing capacity failure, differential settlements, lateral pressures and structural instability. Shallow and deep stabilization of soft ground are most frequently used special construction techniques adopted in geotechnical engineering. Chemical (lime and cement) stabilization has been extensively used in both shallow and deep stabilization in order to improve …

Go to article

Statistics-Based Approaches To Stochastic Optimal Control Problems, Aihong Wen Dec 2005

Statistics-Based Approaches To Stochastic Optimal Control Problems, Aihong Wen

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

This dissertation develops practical approaches to stochastic optimal control problems in the absence of linear system transition functions, quadratic cost functions, and/or Gaussian random disturbances. In such type of problems, an analytical solution is impossible and numerical synthesis techniques have to be applied. The ''classic'' algorithms existing in the literature suffer from the problem of the''curse of dimensionality,'' an exponential increase of computation time and memory requirements as the dimension of the problem grows. The statistics-based numerical approaches are presented as the main tools for mitigating the ``curse of dimensionality'' phenomenon. Two approaches are explored: (A) stochastic dynamic programming (SDP), …

Go to article

Love, Race, And The Low: A Comparative Analysis Of Interracial Relationships In The United States, 1865–1967, Nyla Davis Dec 2005

Love, Race, And The Low: A Comparative Analysis Of Interracial Relationships In The United States, 1865–1967, Nyla Davis

McNair Scholars Research Journal

No abstract provided.

Go to article

Full Issue, The Mcnair Team Dec 2005

Full Issue, The Mcnair Team

McNair Scholars Research Journal

No abstract provided.

Go to article

Homeland Insecurity: The Emotional Response That Expanded The Federal Bureaucracy And Its Efforts To Prevent Acts Of Terrorism Against The United States, Thomas Herrera Dec 2005

Homeland Insecurity: The Emotional Response That Expanded The Federal Bureaucracy And Its Efforts To Prevent Acts Of Terrorism Against The United States, Thomas Herrera

Criminology & Criminal Justice Theses - Archive

This study will examine the emotional response that led to the expansion of the federal bureaucracy of the U.S. Government in the aftermath of the September 11, 2001 terrorist attacks. The federal bureaucracy was expanded in order to prevent future acts of terrorism on the U.S. homeland and execute policies related to the War on Terror. The terrorist attacks of September 11, 2001 had an immediate and overwhelming emotional effect upon the American public and prompted countless memorials and services across the United States and around the world. Gratitude towards uniformed public-safety workers (notably firefighters and police officers) was widely …

Go to article

Gender Inequality In Law Enforcement And Males' Attitudes And Perceptions Toward Women Working In Law Enforcement, Tracee Davis Dec 2005

Gender Inequality In Law Enforcement And Males' Attitudes And Perceptions Toward Women Working In Law Enforcement, Tracee Davis

Criminology & Criminal Justice Theses - Archive

This study aims to identify and analyze the male officers' perception of female officers based on responses from a survey instrument. The data was obtained from a sample of male police officers employed by a police department located in Fort Worth, TX. The findings of the study have direct implications for criminal justice regarding the status of women in policing, future police training, and the attraction and recruitment for female officers.

Go to article

Monitoring Health By Detecting Drifts And Outliers In Patterns Of An Inhabitant In A Smart Home, Gaurav Jain Dec 2005

Monitoring Health By Detecting Drifts And Outliers In Patterns Of An Inhabitant In A Smart Home, Gaurav Jain

Computer Science and Engineering Theses - Archive

The elderly, along with people with disabilities or chronic illness, are most often dependent on some kind of formal or informal care. They are forced to move to a place where they can be cared for. Automatic health monitoring allows them to maintain their independence and continue living at home longer by continuously providing key health and activity information to caregivers. In this thesis, we present a novel technique, called the Health Monitoring System (HMS), which is a data-driven automated monitoring system for detecting changes in the patterns of activities/inactivity, health data and the living environment. HMS classifies these changes …

Go to article

Infosearch: A System For Searching And Retrieving Documents Using Complex Queries, Nikhil Deshpande Dec 2005

Infosearch: A System For Searching And Retrieving Documents Using Complex Queries, Nikhil Deshpande

Computer Science and Engineering Theses - Archive

The colossal amount of information available online has resulted in overloading users who need to navigate this information for their routine requirements. Although search engines have been effective in reducing this information overload, they support only queries involving keywords and Boolean operators. There are certain application domains where more expressive ways of searching are necessary. Consider searching a full-text patent database for documents containing more than n occurrences of a pattern, or for documents that have a particular pattern followed by another pattern within a specified interval. Such complex patterns involving pattern frequency and sequence, as well as patterns involving …

Go to article

Customization Of A Generic Search Engine By Adding User Categories, Ajay Mohandas Madkaiker Dec 2005

Customization Of A Generic Search Engine By Adding User Categories, Ajay Mohandas Madkaiker

Computer Science and Engineering Theses - Archive

The current search engines available on the Net are generic in nature. They do not consider user preferences and treat all users information needs in the same way. As a result they frequently return a large number of links, that do not meet the user's information need. This requires more searching to find what the user is looking for. For example if a user is interested in a particular game, e.g. cricket, and enters the query world cup, a generic search engine would return links of all the sports that hold a world cup. The user has to browse through …

Go to article

Estream: An Integration Of Event And Stream Processing, Vihang Garg Dec 2005

Estream: An Integration Of Event And Stream Processing, Vihang Garg

Computer Science and Engineering Theses - Archive

Event and stream data processing models have been researched extensively and are utilized in diverse application domains. Advanced applications require both event and stream processing, which is currently not supported. Although there are number of similarities and differences between them, a synergistic integration of their strengths will be better than the sum of their parts. In this thesis, we present EStream, an integrated event and stream processing system for monitoring changes on stream computations and for expressing and processing complex events on continuous queries (CQs). We introduce attribute-based constraints for reducing uninteresting events that are generated from CQs. We discuss …

Go to article

Testing Java Monitors By State Space Exploration, Monica Maria Hernandez Dec 2005

Testing Java Monitors By State Space Exploration, Monica Maria Hernandez

Computer Science and Engineering Theses - Archive

Java monitors are classes that are intended to be accessed by multiple threads at the same time. Detecting synchronization faults in Java Monitors is considerably more challenging than testing regular classes, due to the inherent non-determinism of concurrent programs. This thesis proposes a state based exploration approach to testing Java monitors. This approach consists of exploring the state space of a Java monitor in a depth-first manner, dynamically building test sequences, which are comprised by the states explored along each path. Moreover, threads are introduced on the fly during the exploration of each path, based on several rules for simulating …

Go to article

Hdb-Subdue, A Relational Database Approach To Graph Mining And Hierarchical Reduction, Srihari Padmanabhan Dec 2005

Hdb-Subdue, A Relational Database Approach To Graph Mining And Hierarchical Reduction, Srihari Padmanabhan

Computer Science and Engineering Theses - Archive

Data mining aims at discovering interesting and previously unknown patterns from data sets. Transactional mining (association rules, decision trees etc.) can be effectively used to find non-trivial patterns in categorical and unstructured data. For applications that have an inherent structure (e.g., chemical compounds, proteins) graph mining is appropriate, because mapping the structured data into other representations would lead to loss of structure. The need for mining structured data has increased in the past few years. Graph mining uses graph theory principles to perform mining. Database mining of graphs aims at mining structured graph data stored in relational database tables using …

Go to article

Graph-Based Learning Using A Naive Bayesian Classifier, Robert Hawes Dec 2005

Graph-Based Learning Using A Naive Bayesian Classifier, Robert Hawes

Computer Science and Engineering Theses - Archive

Graph-based data representation is becoming increasingly more commonplace, as graphs can represent some kinds of data more efficiently than relational tables. As such, interesting patterns in the form of subgraphs can be discovered by mining these graph-based datasets. Because the learned patterns can be used to predict future occurrences, it is necessary to learn graphical concepts that can optimally classify the data in the presence of uncertainty. This work explores the construction and learning of optimal naïve Bayesian graph classifiers to distinguish between positive and negative graphs given a set of graphs as examples. Whereas most previous work in graph-based …

Go to article

Approaches For Validating Frequent Episodes Based On Periodicity In Time-Series Data, Dhawal Y. Bhatia Dec 2005

Approaches For Validating Frequent Episodes Based On Periodicity In Time-Series Data, Dhawal Y. Bhatia

Computer Science and Engineering Theses - Archive

There is ongoing research on sequence mining of time-series data. We study Hybrid Apriori, an interval-based approach to episode discovery that deals with different periodicities in time-series data. Our study identifies the anomaly in the Hybrid Apriori by confirming the false positives in the frequent episodes discovered. The anomaly is due to the folding phase of the algorithm, which combines periods in order to compress data. We propose a main memory based solution to distinguish the false positives from the true frequent episodes. Our algorithm to validate the frequent episodes has several alternatives such as the naïve approach, the partitioned …

Go to article

Csegrid Portal: A Secure Web-Based Solution For Providing Ubiquitious Access To Grid Services (Design, Development And Implementation Of A Prototype), Srikant D. Rao Dec 2005

Csegrid Portal: A Secure Web-Based Solution For Providing Ubiquitious Access To Grid Services (Design, Development And Implementation Of A Prototype), Srikant D. Rao

Computer Science and Engineering Theses - Archive

Grid computing is emerging as a revolutionary concept for performing high performance computations on the grid. The grid infrastructure comprises of a large set of distributed computing resources that are shared across geographical and organizational boundaries. There is a need within the scientific community for friendly interfaces that can be used to obtain ubiquitous access to the grid resources. In this work, we address these needs by designing and implementing a web-based grid portal system (CSEGrid) that provides the user with transparent access to grid services like job submission, job status and resource monitoring, data transfer between grid resources, etc. …

Go to article

Solving The Rubik's Cube With Parallel Processing, Aslesha Pramod Nargolkar Dec 2005

Solving The Rubik's Cube With Parallel Processing, Aslesha Pramod Nargolkar

Computer Science and Engineering Theses - Archive

This thesis investigates parallel processing techniques for solving the 3 x 3 x 3 Rubik's Cube. We explore various state-space search based algorithmic approaches to optimally solve the Cube. The parallel processing approach is based on IDA* using a pattern database as the underlying heuristic because of its well established effectiveness. The parallel algorithm is an extension of the Michael Reid algorithm which is sequential. The parallel algorithm exhibits good speedup and scalability. Nearly 150 random as well as symmetrical cube configurations were tested for the experiments on sequential and parallel implementations. The proposed parallel algorithm using master-slave type of …

Go to article

Evolving Modular Programs By Extracting Reusable Functions Using Significance Testing, Anthony Loeppert Dec 2005

Evolving Modular Programs By Extracting Reusable Functions Using Significance Testing, Anthony Loeppert

Computer Science and Engineering Theses - Archive

Genetic programming is an automatic programming method that uses biologically inspired methods to evolve programs. Genetic programming, and evolutionary methods in general, are useful for problem domains in which a method for \emph{constructing} solutions is either not known or infeasible, but a method for \emph{rating} solutions exists. In order to address more complex problem domains, techniques exist to extract functions (modules) automatically during a GP search. This work describes a method to identify useful automatically extracted functions from a GP search to assist subsequent GP searches within the same problem domain, using significance testing. Functions classified as beneficial augment the …

Go to article

Human Performance Multimeter: Investigation Of The Fourth Generation Prototype, Rahul Mulukutla Dec 2005

Human Performance Multimeter: Investigation Of The Fourth Generation Prototype, Rahul Mulukutla

Electrical Engineering Theses - Archive

The focus of this thesis is the development and investigation related to the newest prototype version of the Human Performance MultiMeter (HPMM). Version 4 is a technologically advanced, compact, portable and self-contained unit that is the result of an on-going effort in human performance measurement covering a 25 year history at the Human Performance Institute involving the conception, development, and evaluation of over four hundred different measures. Such measurements are applicable in areas ranging from medical diagnosis and rehabilitation to ergonomics and athletic proficiency. The work included verification of the functionality of a new hardware platform, modification of previously developed …

Go to article

Wavelet Domain Diversity Method For Transmission Of Images Over Wireless Sytems Using Hybrid (Ofdm-Cdma-Sfh) Concept And Its Real Time Implementation In Tms320c6713 Dsp Development Board, Madhu Rangappagowda Dec 2005

Wavelet Domain Diversity Method For Transmission Of Images Over Wireless Sytems Using Hybrid (Ofdm-Cdma-Sfh) Concept And Its Real Time Implementation In Tms320c6713 Dsp Development Board, Madhu Rangappagowda

Electrical Engineering Theses - Archive

In this thesis a new OFDM based wavelet domain diversity combining method is proposed to combat errors during image transmission on wireless channels. A novel concept of utilizing OFDM sub-carriers to attain diversity is designed and analyzed. For images represented in the wavelet domain, diversity is used to obtain multiple data streams using OFDM symbols corresponding to the transmitted image at the receiver. These individual image data streams are combined to form a composite image with higher perceptual quality. Both uncompressed and compressed images are considered. The SPIHT algorithm is used for image compression. Diversity combining methods for both uncompressed …

Go to article

Cmos Optical Transimpedance Amplifier Design For Pam Signaling Application, Hemalatha Shanmugasundaram Dec 2005

Cmos Optical Transimpedance Amplifier Design For Pam Signaling Application, Hemalatha Shanmugasundaram

Electrical Engineering Theses - Archive

The advent of Internet telephony and the surge in data communication field necessitate the use of broadband communication systems. The Optical communication systems has been suggested as an attractive solution to cope with the high speed data rate and large throughput bottleneck of the long haul communication systems due to their cheaper deployment cost. In the world of miniaturization, CMOS circuits have been widely used to develop the opto-electronic components. However, the intricacy involved in the design of high speed optical front-end is higher due to the poor noise performance of CMOS circuits compared to their bipolar counter parts. Despite …

Go to article

Study Of The Expression Pattern Of A Possible Pseudogene And A Functional Retrogene In Drosophila, Aditi Bhardwaj Dec 2005

Study Of The Expression Pattern Of A Possible Pseudogene And A Functional Retrogene In Drosophila, Aditi Bhardwaj

Biology Theses - Archive

Gene duplication occurs when a mutation leads to the copying of a region of DNA that contains a functional gene. After duplication, there will be two copies of the gene in the genome. Gene duplication can have deleterious effects but it can also be the source of novelty. It has been acknowledged for a long time that selection may be relaxed for one copy rendering that locus free to mutate and discover new functions. Another of the fates of duplication of special notice is the formation of a pseudogene. Pseudogenes have been defined as nonfunctional sequences of genomic DNA originally …

Go to article

Oligomeric And Polymeric Bibenzimidazole Based Metal Complexes And Crosslinked Polyethylenimine Based Flame Retardants, Jun Yin Dec 2005

Oligomeric And Polymeric Bibenzimidazole Based Metal Complexes And Crosslinked Polyethylenimine Based Flame Retardants, Jun Yin

Chemistry & Biochemistry Dissertations - Archive

In Part I, a simple and mild condensation route for the synthesis of novel bibenzimidazole oligomers and polymers is described using methyl 2,2,2-trichloroacetimidate as a key starting material. The dimer, trimer, tetramer, and polymers of bibenzimidazole were synthesized as a new series of potential conjugated chelating ligands for the metallopolymer studies. The polymers show the maximum absorption at around 400 nm. The optical band gap of the polymer is estimated to be 2.68 eV. In Part II, a series of multinuclear Ru complexes containing di-, tetra-, and octa-RuII centers based on the oligomeric bibenzimidazoles were synthesized and characterized. The species …

Go to article

Laboratory And Field Investigations To Address Erosion, Volume Change And Desiccation Cracking Of Compost Amended Expansive Subsoils, Napat Intharasombat Dec 2005

Laboratory And Field Investigations To Address Erosion, Volume Change And Desiccation Cracking Of Compost Amended Expansive Subsoils, Napat Intharasombat

Civil Engineering Dissertations - Archive

Desiccations cracks are formed during drying process of fine grained cohesive soils in summer and these cracks often appear on unpaved subgrades due to direct exposure to sun. These cracks allow surface runoff infiltration into subsoils and eventually weaken adjacent base and subgrade layers. The loss of support from these underlying layers results in both longitudinal and transverse cracks in paved shoulders and pavements. Composting is a successful method of recycling organic waste material into stabilized materials that could be used for erosion control and landscaping applications. Since compost is rich in fibrous material and exhibits moisture affinity characteristics, it …

Go to article

Do Aid Donors Reward Institutional Reforms?: A Panel Study On Aid-Receiving Countries, Wairimu R. Mugo Dec 2005

Do Aid Donors Reward Institutional Reforms?: A Panel Study On Aid-Receiving Countries, Wairimu R. Mugo

Economics Theses - Archive

Foreign aid is an important component of financial flows to many developing countries. This study seeks to investigate how foreign aid flows are influenced by two factors: the gross domestic products (GDP) per capita of the recipient countries, and changes in institutional and economic factors. For example, do increases in the GDP per capita of recipient countries attract more foreign aid in support of the on going economic and institutional reforms, or does this send a signal to the donors that these countries are doing well, and do not need as much aid? The question is whether aid donors reward …

Go to article

Participation, Identity, And Social Support In A Spiritual Community, Ladorna Mcgee Dec 2005

Participation, Identity, And Social Support In A Spiritual Community, Ladorna Mcgee

Sociology & Anthropology Theses - Archive

Paganism is a loosely organized community whose religious ideology incorporates the immanence of Deity. As a religious association with an ideology different from traditional Judeo-Christian faiths, members are often labeled as deviant and subjected to various negative sanctions. By relying on survey data collected on April 9-12, 1996 and in depth personal interviews collected on October 10-13, 1996, this study presents a model that best describes and explains acceptance and participation in pagan spiritualism. This study identifies three characteristics associated with positive ratings of childhood religious affiliation (church disaffection, family closeness, and role), three characteristics associated with feelings of belonging …

Go to article

Removal Of Carbonyl Sulfide Using Compost Biofilter: Measurement Of Removal Rates And Elimination Capacity In Conjunction With Hydrogen Sulfide, Divya R. Garrepalli Dec 2005

Removal Of Carbonyl Sulfide Using Compost Biofilter: Measurement Of Removal Rates And Elimination Capacity In Conjunction With Hydrogen Sulfide, Divya R. Garrepalli

Civil Engineering Theses - Archive

A lab study using biofiltration was conducted using three PVC columns as biofilters, with hardwood chips and compost as the media. Previous research determined the removal efficiency of carbonyl sulfide alone. (Nawal, 2004) Typically, however H2S is present with COS in the air streams from wastewater treatment plant units. In the current study, different combinations of hydrogen sulfide and carbonyl sulfide gases were tested using H2S/COS ratios typical of the concentrations from wastewater treatment plants. Various runs were conducted using compost and hardwood chips individually and also with an 80:20 ratio by volume of wood chips to compost. The specific …

Go to article

First Prev Next Last