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2003

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Cracking Of Zirconium Alloys At Constant Load With And Without Applied Potentials, Heidi T Aquino Jan 2003

Cracking Of Zirconium Alloys At Constant Load With And Without Applied Potentials, Heidi T Aquino

UNLV Retrospective Theses & Dissertations

Cladding materials, namely Zircaloy-2 (Zr-2) and Zircaloy-4 (Zr-4), were tested for evaluation of their resistance to stress corrosion cracking (SCC), delayed hydride cracking (DHC), and localized corrosion (pitting and crevice) in neutral and acidic environments at ambient temperature and 90°C. For SCC testing, constant load and slow-strain-rate techniques were used. Some SCC testing were also performed under controlled electrochemical potentials (Econt). The localized corrosion behavior was studied by cyclic potentiodynamic polarization technique. Metallurgical microstructures and fractography were analyzed by optical microscopy and scanning electron microscopy (SEM), respectively. The results obtained from this study indicate that no failures were observed under …

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Vocabulary Acquisition And The Generation Effect, Barbara Anne Badgett Jan 2003

Vocabulary Acquisition And The Generation Effect, Barbara Anne Badgett

UNLV Retrospective Theses & Dissertations

This study investigated two methods of inducing the Generation Effect and how its principles might be incorporated in vocabulary acquisition. Subjects attempted to learn 22 unfamiliar vocabulary words under one of three conditions. (1) definition-only control subjects repeatedly wrote each word and definition; (2) sentence generation subjects wrote each word and definition and then wrote a meaningful sentence using that word; and (3) definition generation subjects read the words embedded in context sentences and extrapolated and wrote the word meanings. Subjects were tested following a distracter task, 48-hours later, and again 21-days later. Significant main effects were found for encoding …

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The Design, Implementation, And Effectiveness Of A Farsi Word Stemmer, Russell Beckley Jan 2003

The Design, Implementation, And Effectiveness Of A Farsi Word Stemmer, Russell Beckley

UNLV Retrospective Theses & Dissertations

A stemmer for the Farsi language has been designed, implemented, and evaluated. The stemmer uses Farsi morphology to remove affixes, producing effective stems. The implementation is written in C, using strings of unicode-encoded characters to represent Farsi words. It is meant to enhance the Farsi information retrieval system currently being developed at the Information Science Research Institute at the University of Nevada at Las Vegas. The effectiveness of the Farsi stemmer and stopword list on recall/precision was tested.

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Adaptive, Suboptimal And Nonlinear Control Of An Aeroelastic System, Nilesh G Bhoir Jan 2003

Adaptive, Suboptimal And Nonlinear Control Of An Aeroelastic System, Nilesh G Bhoir

UNLV Retrospective Theses & Dissertations

In this thesis, control systems are designed for the flutter control of a nonlinear aeroelastic system. The aeroelastic model describes the plunge and pitch motion of a wing. The model includes plunge and pitch nonlinearties, and has a single control surface for the purpose of control. First an output feedback modular adaptive control system is derived. Quasi-steady aerodynamic model is used for the output feedback modular adaptive control system. For the synthesis of the adaptive controller, it is assumed that only pitch angle and plunge displacement are measured. The control system consists of an input-to-state stabilizing controller and a passive …

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An Exploration Of Attributional Style Using The Descriptive Experience Sampling Method, Nicole A Cavenagh Jan 2003

An Exploration Of Attributional Style Using The Descriptive Experience Sampling Method, Nicole A Cavenagh

UNLV Retrospective Theses & Dissertations

This study explored the association between cognitive style and depression. Phase I: 195 participants completed questionnaires that assessed cognitive style and psychological distress. Among these participants the expected relationships were found between depression, anxiety, interpersonal sensitivity, attributional style, and rumination; Phase II: Six participants selected based on their attributional style engaged in Descriptive Experience Sampling, which entails wearing a small device that will beep at random intervals, recording their awareness at the sound of the beep, and being interviewed within twenty-four hours of doing so. The inner experiences revealed by DES did not generally show the patterns suggested by current …

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Qualitative Scoring Procedures For The Detection Of Malingering Using The Wechsler Memory Scale - Third Edition, Joshua E Caron Jan 2003

Qualitative Scoring Procedures For The Detection Of Malingering Using The Wechsler Memory Scale - Third Edition, Joshua E Caron

UNLV Retrospective Theses & Dissertations

Individuals undergoing neuropsychological evaluation are often involved in litigation for compensation. Consequently, much incentive to perform poorly on neuropsychological assessments exists. Thus, sophisticated detection methods are desirable. One promising approach may be to utilize qualitative scoring that provides information regarding the test taking strategy. Many current methods use a single quantitative score to discriminate people who malinger cognitive deficits, which may overlook sensitive information and be less accurate. This study developed and applied qualitative scoring procedures for the WMS-III and evaluated them using four experimental groups: sophisticated malingerer, naive malingerer, normal control, and brain damage. Results were mixed. When added …

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Poly(Pyridinium Salt)S Exhibiting Liquid-Crystalline And Light-Emitting Properties, James Joseph Cebe Jan 2003

Poly(Pyridinium Salt)S Exhibiting Liquid-Crystalline And Light-Emitting Properties, James Joseph Cebe

UNLV Retrospective Theses & Dissertations

The research presented in this thesis is based on the synthesis and characterization of poly(pyridinium salt)s containing tosylate and triflimide counterions that possess both liquid-crystalline properties as well as light emitting properties. Both the solution-state and solid-state emission behavior of these synthesized materials were investigated. They possessed several emission peaks in their spectra ranging from 280 nm to about 550 nm. Some of these polymers were found to form liquid-crystalline properties in common organic solvents such as methanol and dimethylsulfoxide (DMSO), while others were found to exhibit a liquid-crystalline phase upon melting, and are so-called thermotropic liquid crystals. The polymers …

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Form Processing With The Hough Transform, De Chen Jan 2003

Form Processing With The Hough Transform, De Chen

UNLV Retrospective Theses & Dissertations

A form document processing system based on the Hough transform (HT) is developed. It performs form identification and form registration. For form identification, HT is applied off-line to master forms to calculate form features and build-up the feature database, and it is performed on-line for the input (scanned) forms to extract features to identify the form type based on feature matching. The derived features are rotation, translation and scale invariant. The proposed form description is compact, thereby allows for fast identification. The registration is feature/knowledge based. Two methods for control points detection are discussed; one implements template matching for finding …

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Determinants Of Ceo Compensation In The Hospitality Industry, Yoonhwa Choi Jan 2003

Determinants Of Ceo Compensation In The Hospitality Industry, Yoonhwa Choi

UNLV Retrospective Theses & Dissertations

This study empirically investigated whether CEO pay is linked to company performance within the hospitality industry, and attempted to further identify determinants of executive compensation among selected variables used in this study for the hotel, casino, and restaurant sectors. Thus, the present study adds to the body of knowledge on executive compensation for the hospitality industry by newly identifying sector-specific variables; The data was gathered for the years 1995--2000 for 22 hotels (SIC 7011), 25 casinos (SIC 7990), and 61 restaurants (SIC 5812) respectively. The final samples of the restaurant, hotel and casino sectors consisted of 53, 77, and 188 …

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Efficient Design And Implementation Of Image Processing Algorithms On Reconfigurable Hardware Using Handel-C, Venkateshwar Rao Daggu Jan 2003

Efficient Design And Implementation Of Image Processing Algorithms On Reconfigurable Hardware Using Handel-C, Venkateshwar Rao Daggu

UNLV Retrospective Theses & Dissertations

Computer manipulation of images is generally defined as Digital Image Processing (DIP). DIP is used in variety of applications, including video surveillance, target recognition, and image enhancement. These applications are usually implemented in software but may use special purpose hardware for speed. With advances in the VLSI technology hardware implementation has become an attractive alternative. Assigning complex computation tasks to hardware and exploiting the parallelism and pipelining in algorithms yield significant speedup in running times. In this thesis the image processing algorithms like median filter, basic morphological operators, convolution and edge detection algorithms are implemented on FPGA. A pipelined architecture …

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I-Magic Labelings Of Cubic Trees And N-Caterpillars, John Thomas Ethier Jan 2003

I-Magic Labelings Of Cubic Trees And N-Caterpillars, John Thomas Ethier

UNLV Retrospective Theses & Dissertations

Let G be a graph with q edges, then an edge labeling L: E → {1, 2,.., q} is a bijection from the set of edges E to the set of natural numbers less than or equal to q. A graph is said to be I-magic if there exists an edge labeling such that the sum of all edge labels incident to each internal vertex has the same value, and this value is called the magic index t, while the labeling is called an I-magic labeling. It has been conjectured that all cubic trees are I-magic. In this paper, we …

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The Age, Stratigraphy, And Tectonic Provenance Of Clastic Deposits In The Western Bikou Terrane, Southwestern Qinling Mountains, China, Peter Alexander Druschke Jan 2003

The Age, Stratigraphy, And Tectonic Provenance Of Clastic Deposits In The Western Bikou Terrane, Southwestern Qinling Mountains, China, Peter Alexander Druschke

UNLV Retrospective Theses & Dissertations

The Qinling Mountains of central China are the product of Late Paleozoic to Triassic collision between the North China Plate and the South China Plate. Located within the southwestern Qinling Mountains is the Bikou terrane, a low grade metamorphic assemblage of igneous and clastic sedimentary rocks located adjacent to the northern margin of the South China Plate. The age and tectonic setting of clastic deposits within the Bikou terrane have long been controversial, with age estimates ranging from Lower Proterozoic to Late Paleozoic, and tectonic provenance theories ranging from subduction arc to continental rift; The southeastern portion of the Bikou …

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Converging Behaviorist And Constructivist Theories In Classroom Settings, Lisa M Freitas Jan 2003

Converging Behaviorist And Constructivist Theories In Classroom Settings, Lisa M Freitas

UNLV Retrospective Theses & Dissertations

Educators attempts to meet the needs of all students become more difficult as school districts are forced to reduce spending which may result in increased class sizes, elimination of second language and enrichment programs, and a reduction in school personnel at school sites. With these budget cuts the demands placed on educators will be even greater. Teachers will be forced to implement new strategies to ensure that no child is left behind. The purpose of this study is to assess the effectiveness of converging behaviorist and constructvist theories into classroom management and instructional practices. Three groups of students were randomly …

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What's Swimming In My Glass? The Debate Over The Southern Nevada Water Authority's Use Of The Return Flow Credit Policy, Patrick L Ferguson Jan 2003

What's Swimming In My Glass? The Debate Over The Southern Nevada Water Authority's Use Of The Return Flow Credit Policy, Patrick L Ferguson

UNLV Retrospective Theses & Dissertations

Currently the Southern Nevada Water Authority uses an existing federal policy of return flow credits to divert water from Lake Mead above the annual allocation authorized by the Colorado River System Water Use Agreement. Credits obtained by the return of treated effluent allow water officials to divert as much Colorado River water as is needed to sustain current growth and development here in southern Nevada. Some in the community believe that this is a prudent use of a valuable resource; others that it is a means to justify the over-consumption of water and is altering the watershed in potentially harmful …

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A Comparison Of Thermal Storage Models With A Solar Electric Generation System Using Trnsys, Jade Gaal Jan 2003

A Comparison Of Thermal Storage Models With A Solar Electric Generation System Using Trnsys, Jade Gaal

UNLV Retrospective Theses & Dissertations

Two new component types were developed for the transient simulation program TRNSYS with IISiBat that models three different types of sensible thermal storages for analysis with use in a solar electric generating system (SEGS) simulation. One component containing a fully mixed, stratified and a plug flow tank model has been developed such that the inputs and parameter specifications are similar so that all three models could be easily placed into one component type. A single, cylindrical direct storage tank with one inlet and one outlet that evaluates fluid properties as a function of temperature is representative for all three models. …

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Predictive Modeling Of Soluble Sulfate Ion Concentration In The Las Vegas Valley, Werner K Hellmer Jan 2003

Predictive Modeling Of Soluble Sulfate Ion Concentration In The Las Vegas Valley, Werner K Hellmer

UNLV Retrospective Theses & Dissertations

This study investigates the process of identifying soluble sulfate ion concentrations in the Las Vegas Valley. Data utilized in this study were obtained from Clark County Department of Development Services records. Once collected, the data were reviewed and analyzed with traditional non-spatial statistics and spatial-based geostatistical modeling. This study was undertaken in an effort to identify factors that may correlate with soluble sulfate ion concentrations and to determine the feasibility of producing a predictive model capable of estimating soluble sulfate ion concentrations within the Las Vegas Valley; The study showed that relief, spatial location, soil grain size classification and Clark …

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The Design And Performance Of An X-Ray Emission Spectrometer Using The Polarized Kalpha Spectra Of Chlorine And Potassium, Amanda C Hudson Jan 2003

The Design And Performance Of An X-Ray Emission Spectrometer Using The Polarized Kalpha Spectra Of Chlorine And Potassium, Amanda C Hudson

UNLV Retrospective Theses & Dissertations

The x-ray emission spectrometer was designed to observe the polarization of x-ray fluorescence resulting from the excitation of a sample by synchrotron radiation. The incident photons are intense, monoenergetic and linearly polarized along the plane of the storage-ring orbit. The emission spectrometer records the entire K-alpha spectrum by dispersing the emitted radiation with a curved Si (111) crystal and detecting the resulting radiation with a resistive anode position sensitive detector; both of which are situated on a Rowland circle. A sample is fixed in position and located in the middle of the Rowland circle. The spectrometer can be positioned to …

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Synthesis And Characterization Of Novel Polyaniline/Metal Composites, John Macharia Kinyanjui Jan 2003

Synthesis And Characterization Of Novel Polyaniline/Metal Composites, John Macharia Kinyanjui

UNLV Retrospective Theses & Dissertations

The chemical synthesis of polyaniline (PANI) is explored using tetrachloroaurate, AuCl4- and hexachloroplatinate, PtCl 62-. These studies provide a simple method for the direct oxidation of aniline by these metal species and simultaneous formation of bulk quantities of PANI/Au and PANI/Pt composites, respectively. Studies of the PANI/Au composite indicate that the properties of the polymer are consistent with more traditional methods of preparation. The incorporation of metal into the polymer matrix shows an increase in conductance for the doped PANI/Au composite relative to PANI/HBF4 without Au particles. In the case of the PANI/Pt composite, the polymer is found to exist …

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Crit, Andrew Kiraly Jan 2003

Crit, Andrew Kiraly

UNLV Retrospective Theses & Dissertations

This creative thesis, a long work of fiction, is about a rock critic, Gabe Sack, who writes for a Los Angeles-based music magazine. He is tired of his job and decides to quit. However, his boss gives him one final assignment: he must track down an obscure lounge singer and write a profile of him. With his friends Staley and Darcy in tow, Gabe drives to Las Vegas. During the trip, he reflects on his life, his attitude, and his relationships with others. He senses that his job, which requires him to criticize the work of others, has had negative …

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A Controlled Evaluation Of A Comprehensive Mental Skills Program For Ncaa And Youth Club Swimmers, Kevin Matthew Lancer Jan 2003

A Controlled Evaluation Of A Comprehensive Mental Skills Program For Ncaa And Youth Club Swimmers, Kevin Matthew Lancer

UNLV Retrospective Theses & Dissertations

Previous studies have established that mental skills training is an effective intervention for improving performance in athletes. Relaxation, imagery, and mental preparation interventions have demonstrated efficacy in the improvement of athletic performance. However, relaxation combined with imagery is more effective than either one alone. Similarly, past studies have indicated mental preparation interventions may be more effective in the improvement of athletic performance when combined with other interventions. In team sports such as swimming, optimum performance has been found to improve cohesion. However, whether cohesion leads to improvements in sports performance is undetermined. In this study, a multiple baseline across team …

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Recognition And Identification Of Form Document Layouts, Kai Luo Jan 2003

Recognition And Identification Of Form Document Layouts, Kai Luo

UNLV Retrospective Theses & Dissertations

In this thesis, a hierarchical tree representation is introduced to represent the logical structure of a form document. But different forms might have the same logical structure, so the representation will be ambiguous. In this thesis, an improvement is proposed to solve the ambiguity problem by using the physical information of the blocks. To fulfill the application of hierarchical tree representation and extract the physical information of blocks, a pixel tracing approach is used to extract form layout structures from form documents. Compared with Hough transform, the pixel tracing algorithm requires less computation. This algorithm has been tested on 50 …

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"In That New World Which Is The Old": New World/Old World Inversion In Aldous Huxley's "Brave New World", Oliver Quimby Melton Jan 2003

"In That New World Which Is The Old": New World/Old World Inversion In Aldous Huxley's "Brave New World", Oliver Quimby Melton

UNLV Retrospective Theses & Dissertations

"'In That New World Which Is The Old': New World/Old World Inversion In Aldous Huxley's Brave New World" examines the inversion of the concepts Old World, specifically associated with England, and New World, specifically associated with America, in the novel Brave New World. After examining and denotatively defining the terms Old World and New World, this thesis argues that the New World/Old World inversion in Huxley's dystopian novel exists because of Anglo-American cultural and political events of the 1920s and early 1930s, namely, the United States' rise as a military, political, and cultural superpower following World War I and Great …

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Study Of Subthreshold Behavior Of Finfet, Balasubramanian Murugan Jan 2003

Study Of Subthreshold Behavior Of Finfet, Balasubramanian Murugan

UNLV Retrospective Theses & Dissertations

The study of subthreshold behavior of Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is critically important in the case of submicron devices for the successful design and implementation of digital circuits. Fin Field Effect Transistor (FinFET) is considered to be an alternate MOSFET structure in the deep sub-micron regime. A 3D Poisson equation solver is employed to study the subthreshold behavior of FinFET. Based on potential distribution inside the fin, the appropriate band bending and the subthreshold value called the S-factor is calculated. It is observed that the S-factor of the device increases as the channel width, Tfin increases. This …

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The Creation Of A National Information Policy Combating Cyber Terrorism, Daniel A Nick Jan 2003

The Creation Of A National Information Policy Combating Cyber Terrorism, Daniel A Nick

UNLV Retrospective Theses & Dissertations

The infrastructures of the United States are dependent upon computers. This creates a new threat to the national security of the United States in the form of cyber terrorism; Cyber terrorism is the new type of warfare. It can take a cyber terrorist seconds to break into a computer network, download information, and leave without a trace. There needs to be a comprehensive policy to combat the cyber terrorism threat; The National Information Policy is a set of ideas brought together to combat the threat of a cyber terrorist attack against the infrastructures of the United States. These ideas include: …

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The Relationship Of Cell Morphology, Density, And Mechanical Properties In A Rigid Polyurethane Foam, Michelle Cameron Nelson Jan 2003

The Relationship Of Cell Morphology, Density, And Mechanical Properties In A Rigid Polyurethane Foam, Michelle Cameron Nelson

UNLV Retrospective Theses & Dissertations

Polyurethane foam, used as a supporting or insulating material, is sometimes formed in complex molds with significant variations in geometry and size. This work investigates the relationships between cell morphology, density, and mechanical properties in a molded polyurethane material using relatively small cylindrical molds. Understanding these relationships will help mechanical designers analyze and predict the responses of foam components accurately; Three mold sizes are used to study changes in cell morphology (cell area, cell diameter, aspect ratio, cell angle, cell edge length, cell face thickness, and cell edge thickness), density, and mechanical properties (Young's modulus, peak yield, and collapse stress) …

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A Graphical Approach For Goodness-Of-Fit Of Poisson Model, Davin P Padilla Jan 2003

A Graphical Approach For Goodness-Of-Fit Of Poisson Model, Davin P Padilla

UNLV Retrospective Theses & Dissertations

Extensive work has been done on goodness-of-fit (GOF) tests for data assumed to have come from univariate continuous distributions; however, literature on GOF procedures for univariate discrete distributions is rather sparse in compariSon The Poisson distribution in particular has received much attention in the study of GOF tests due to its numerous applications as a model for observable phenomena. Hence, we survey existing GOF tests for Poissonity and present a useful guide to the most commonly used distribution-free GOF tests in practice. We then propose and investigate a graphical test of fit for the Poisson model that is based on …

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The Relationship Between Internal Service Components And Organizational Commitment In Fine-Dining Restaurants, Taryn M Perry Jan 2003

The Relationship Between Internal Service Components And Organizational Commitment In Fine-Dining Restaurants, Taryn M Perry

UNLV Retrospective Theses & Dissertations

Due to increased competition in the restaurant industry, employers need to offer more than monetary compensation to attract quality employees. Offering these non-economic benefits, or internal services, can aid in keeping employees satisfied and committed to their organizations. The purpose of this study was to examine the relationship between internal service components and organizational commitment. Data was collected from three fine-dining restaurants in Las Vegas, Nevada. The original hypotheses were not supported by the research results. Yet, the study did yield evidence indicating that satisfaction with some aspects of internal services was influential in predicting organization commitment. Implications for management …

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A Benefit-Cost Analysis Of An Interstate Seawater Desalination Plant Shared Between California And Nevada, Mcclain L Peterson Jan 2003

A Benefit-Cost Analysis Of An Interstate Seawater Desalination Plant Shared Between California And Nevada, Mcclain L Peterson

UNLV Retrospective Theses & Dissertations

According to the Southern Nevada Water Authority (2002), increasing demands for water in southern Nevada will require the importation of additional water resources. The purpose of this thesis was to examine one possible imported resource: an interstate seawater desalination cooperative between entities in California and Nevada. This cooperative would provide a permanent transfer of Colorado River water from California to southern Nevada, in trade for a capital contribution toward California coastal seawater desalination. This study uses a benefit-cost approach as outlined in Dively and Zerbe (1994). Costs of both entities in Nevada and California were calculated and technical feasibility detailed. …

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Evaluation Of Cracking And Localized Corrosion Behavior Of Cladding Materials, Subhas Pothana Jan 2003

Evaluation Of Cracking And Localized Corrosion Behavior Of Cladding Materials, Subhas Pothana

UNLV Retrospective Theses & Dissertations

This investigation is focused on the evaluation of stress corrosion cracking (SCC), hydrogen embrittlement (HE) and localized corrosion (pitting and crevice) susceptibility of zircaloy-2 and zircaloy-4 in neutral and acidic solutions at 30, 60, 90°C. Constant-load and slow-strain-rate (SSR) testing methods were used to evaluate the SCC and HE behavior of both alloys by use of smooth and notched tensile specimens. Controlled cathodic potentials were applied to evaluate the hydrogen effect on the cracking behavior. Cyclic potentiodynamic polarization technique was used to determine the localized corrosion susceptibility. The metallography and morphology of failure were analyzed by optical microscopy and scanning …

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Identification Of Headers And Footers In Noisy Documents, Qin Liu Jan 2003

Identification Of Headers And Footers In Noisy Documents, Qin Liu

UNLV Retrospective Theses & Dissertations

Optical Recognition Technology is typically used to convert hard copy printed material into its electronic form. Many presentational artifacts such as end-of-line hyphenations, running headers and footers are literally converted. These artifacts can possibly hinder proximity and exact match searching; This thesis develops an algorithm to extract running headers and footers from electronic documents generated by OCR. This method associates each page of the document with its neighboring pages and detects the headers and footers by comparing the page with its neighboring pages. Experiments are also taken to test the effectiveness of these algorithms.

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