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1997

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The Migration Of Arsenic And Lead In Surface Sediments At Three Kids Mine, Henderson, Nevada, Douglas Brian Sims Jan 1997

The Migration Of Arsenic And Lead In Surface Sediments At Three Kids Mine, Henderson, Nevada, Douglas Brian Sims

UNLV Retrospective Theses & Dissertations

This study focused on the distribution of arsenic and lead in surface sediments at Three Kids Mine in Henderson, Nevada. The mine site encompasses approximately 470 acres of desert and is situated above two developing communities (Lake Las Vegas and Calico Ridge) and the Las Vegas Valley's water source (Lake Mead); Transport of arsenic and lead appears to have occurred within a limited range in both the eastern and western washes on the eastern and western sides of Three Kids Mine. Concentrations of arsenic range between 20 mg/kg (ppm) and 1130 mg/kg and between 20 mg/kg and 8400 mg/kg for …

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Low Harmonic Distortion Flash A/D Converters Incorporating Dynamic Element Matching Techniques, Bret David Steadman Jan 1997

Low Harmonic Distortion Flash A/D Converters Incorporating Dynamic Element Matching Techniques, Bret David Steadman

UNLV Retrospective Theses & Dissertations

New dynamic element matching techniques are shown to reduce the harmonic distortion and improve the spurious-free dynamic range of flash ADCs. Resistor chain mismatch errors are negated by randomly rearranging the resistors each sample by utilizing 5(2{dollar}\sp{b}{dollar}-1) digital switches and b + 1 random control signals for a b-bit flash ADC. The integral and differential nonlinearity of a non-ideal flash ADC are derived for three common resistor chain mismatch errors; namely, geometric mismatches, linear gradient mismatches, and dynamic mismatches. The transfer function of a non-ideal flash ADC is also derived and the converter output is shown to consist of a …

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Automatic Clustering And Feedback In Information Retrieval, Girish Venkatachaliah Jan 1997

Automatic Clustering And Feedback In Information Retrieval, Girish Venkatachaliah

UNLV Retrospective Theses & Dissertations

Clustering and feedback have been used in information retrieval to improve the effectiveness of retrieving relevant documents. In this thesis, we investigate the retrieval effectiveness from various document collections in presence of both clustering and feedback. More precisely, we apply a clustering algorithm to an initial run of our queries to choose appropriate clusters for feedback. The clustering and feedback are done automatically.

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The Credibility Of News Photography In The Digital Age, Mara Evonne Vernon Jan 1997

The Credibility Of News Photography In The Digital Age, Mara Evonne Vernon

UNLV Retrospective Theses & Dissertations

Photographers have been manipulating photographs since photography's invention, but digital imaging technology presents photographers with unlimited possibilities. Digital imaging technology allows both simple and complex manipulations to be completed easily and quickly, unlike traditional techniques that are both difficult and time consuming. Additionally, detecting digital manipulation is virtually impossible, jeopardizing photography's referent to the original scene captured through the lens of a photographer's camera; A review of the literature demonstrated a need for research in relation to the media consumer because prior research focused on media practitioners and their tolerance or intolerance for digital manipulation practices. This thesis explores the …

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On The Design Of A Secure Data Warehouse, Rihui Wang Jan 1997

On The Design Of A Secure Data Warehouse, Rihui Wang

UNLV Retrospective Theses & Dissertations

The data warehouse is the combination of subject-oriented, authoritative, integrated databases designed to support the DSS (decision support). Data mining means to extract useful information which is previously unknown from information sources. The topic of data warehousing and data mining encompasses architectures, algorithms and tools for collecting selected data from multiple databases or other information sources into a single repository known as a data warehouse which is structured to facilitate query or analysis in supporting decision making; In this thesis, we will discuss the principles, architecture, and implementation of data warehouses. We will also discuss construction of data mining and …

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Use Of Neural Networks To Predict Ocr Accuracy, Ying Wang Jan 1997

Use Of Neural Networks To Predict Ocr Accuracy, Ying Wang

UNLV Retrospective Theses & Dissertations

Use of Neural Networks to Predict OCR Accuracy investigates issues in developing an artificial neural network (ANN) based system for prediction of OCR accuracy from the image of a page. This work extends the work of Blando and Gonzalez in the following ways: enlarging training data, proposing new features, comparing different ANN architectures, and introducing a cross-validation learning algorithm; The following experiments were performed: comparison of 14 dimension feature metrics and 7 dimension feature metrics, comparison of an ANN trained with and without cross-validation, comparison of different neural network architectures, comparison of prediction capability of neural network and linear regression, …

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Examining Student Perceptions Of The Transitional Services School Counselors Provide To College-Bound Individuals With And Without Learning Disabilities In The Areas Of Self-Awareness, Self-Advocacy, And The Law, Gillian Elisa Wells Jan 1997

Examining Student Perceptions Of The Transitional Services School Counselors Provide To College-Bound Individuals With And Without Learning Disabilities In The Areas Of Self-Awareness, Self-Advocacy, And The Law, Gillian Elisa Wells

UNLV Retrospective Theses & Dissertations

College-bound students with and without learning disabilities were surveyed, to examine their perceptions of the transitional services provided by school counselors in the areas of self-awareness, self-advocacy, and the law. It appears that both groups are receiving some transitional services. Self-Awareness, self-advocacy, and the law are three components that are not covered by school counselors who work with students. In a majority of cases students cite family and other professionals as the only assistance they receive in these areas.

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Robust Dynamic Feedback And Variable Structure Adaptive Control Of Rigid And Flexible Spacecraft, Yueming Zeng Jan 1997

Robust Dynamic Feedback And Variable Structure Adaptive Control Of Rigid And Flexible Spacecraft, Yueming Zeng

UNLV Retrospective Theses & Dissertations

This thesis presents control systems design for control of rigid and flexible spacecraft in the presence of parameter uncertainty and disturbance inputs. Two kinds of control systems are designed for the control of rigid spacecraft. For the design of the first controller, Rodrigues parameters and modified Rodrigues parameters are used to describe the orientation of spacecraft. A dynamic decoupling attitude control law is derived for the tracking of reference attitude trajectories. The singular perturbation theory is used for the stability analysis of the closed-loop system. For the synthesis of the control law, only the attitude error is required. The second …

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The Effect Of A Second Stimulus On The First Reaction Time Within The Psychological Refractory Period Paradigm, Huiwen Zhang Jan 1997

The Effect Of A Second Stimulus On The First Reaction Time Within The Psychological Refractory Period Paradigm, Huiwen Zhang

UNLV Retrospective Theses & Dissertations

This study was to examine the effects of the second stimulus and response on the first response by investigating RT1 under controlled conditions with different S2-R2. 24 subjects participated in this study. Results of the repeated measure ANOVA revealed that the effect of the second stimulus and response on the first response in PRP paradigm was significant. The findings of this study suggest that PRP exist not only in the processing of the second stimulus but also in the processing of the first stimulus and response. The result from this study failed to support either traditional bottleneck models or parallel …

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A Critical Analysis Of Barriers That Inhibit Latino Parent Involvement As Students Make The Transition From Esl To Mainstream Classrooms, Linda R Skroback-Heisler Jan 1997

A Critical Analysis Of Barriers That Inhibit Latino Parent Involvement As Students Make The Transition From Esl To Mainstream Classrooms, Linda R Skroback-Heisler

UNLV Retrospective Theses & Dissertations

The purpose of this study was to explore the perspectives of Latino families concerning parent involvement roles while their children made the transition from ESL to mainstream classrooms. Three families were interviewed individually at eight week intervals for ten months. Using critical theory as a framework, data sources established three themes of status quo describing parents' knowledge and beliefs during prior experiences, ESL class, and during the year their fourth grade children were mainstreamed. Initially coded by constant comparative methods, a second and critical analysis of data uncovered the fourth theme: barriers encountered by Latino parents during the mainstream year. …

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A Cause-And-Effect Relationship Between Leadership And Corporate Culture: An Educational Perspective, Shane C Blum Jan 1997

A Cause-And-Effect Relationship Between Leadership And Corporate Culture: An Educational Perspective, Shane C Blum

UNLV Retrospective Theses & Dissertations

The purpose of this exploratory research was to examine the relationship between the corporate culture of four-year hospitality management programs and the leadership styles of individuals responsible for leading these programs. Separate instruments were used to survey faculty and program heads of four-year hospitality management programs in an attempt to explore numerous research questions. Certain questions focused on the leadership styles of individuals in positions of authority within the program's administration. Other questions were geared toward evaluating the strength of the program's culture measured along a number of criteria. By examining these questions a theoretical relationship between leadership and culture …

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Mass Spectroscopy Of Molecules Following Deep-Core-Shell Photoexcitation, David Linnemann Hansen Jan 1997

Mass Spectroscopy Of Molecules Following Deep-Core-Shell Photoexcitation, David Linnemann Hansen

UNLV Retrospective Theses & Dissertations

The relaxation dynamics of HCl, DCl, H{dollar}\sb2{dollar}S, and D{dollar}\sb2{dollar}S following photoexcitation in the vicinity of the Cl, and S K-shell thresholds ({dollar}\sim{dollar}2.8 keV for Cl, {dollar}\sim{dollar}2.5 keV for S) were studied by means of ion time-of-flight mass spectroscopy using monochromatic synchrotron radiation. In all cases, the onset of pre-edge core-shell photoionization precedes the formation on resonance of a significant amount of neutral hydrogen as well as post-collision-interaction effects above threshold. At the lowest resonant excitation to the 6{dollar}\sigma\sp{\*}{dollar} antibonding orbital in HCl, almost half of the excited molecules decay by emission of a neutral H atom, mostly in coincidence with …

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An Ethnography Of Homeless Men In Las Vegas, Kurt B Borchard Jan 1997

An Ethnography Of Homeless Men In Las Vegas, Kurt B Borchard

UNLV Retrospective Theses & Dissertations

Most recent research on homeless men (1) uses quantitative methods, (2) frequently blames homeless men for being homeless, and (3) does not consider the different meanings different groups assign to homelessness. These studies cannot address (1) the usefulness of other methods in studying homelessness, (2) what other factors beyond personal problems may contribute to homelessness, and (3) how different groups in different locales view the condition; In this dissertation I use qualitative methods first to think about the popular meanings of male homelessness in Las Vegas, Nevada, in the late 1990s, and second, to consider the meanings that local homeless …

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Canons By Consensus: Critical Trends And American Literature Anthologies, Joseph Thomas Csicsila Jan 1997

Canons By Consensus: Critical Trends And American Literature Anthologies, Joseph Thomas Csicsila

UNLV Retrospective Theses & Dissertations

Scholarly researchers have seldom recognized the college classroom textbook as a valid document of literary history, presumably because it is such an ordinary, taken-for-granted fixture in the academic environment. Canons by Consensus: Critical Trends and American Literature Anthologies, however, examines in detail the evolving critical reputations of thirty American authors in the twentieth century as reflected in these assigned anthologies. A study of nearly eighty college-level collections of American literature marketed between 1919 and 1998 shows that scholarly trends have significantly shaped their editors' perceptions of American writers over the last eighty years, indeed that the shifting paradigms within the …

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Visual Surveillance: Contemporary Sociological Issues, Christopher Taylor Jan 1997

Visual Surveillance: Contemporary Sociological Issues, Christopher Taylor

UNLV Retrospective Theses & Dissertations

The topic of this dissertation is visual surveillance. The research addresses two aspects of surveillance in the social world. First, how surveillance cameras oversee people and activities in social space, and second, how the individuals and technology of surveillance are organized. The introduction describes the recent proliferation of surveillance. The literature review describes what I call the six sociological tenets of visual surveillance. The methodology describes the qualitative techniques used in this research, including the issues and problems encountered in studying secret organizations. The results of interviews and interactions are presented as an ethnographic narrative that describes: a history of …

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Sivilizing' The Washoe Zephyr: Mark Twain's Writing For The "Buffalo Express", 1869-1871, Janice E Mcintire Jan 1997

Sivilizing' The Washoe Zephyr: Mark Twain's Writing For The "Buffalo Express", 1869-1871, Janice E Mcintire

UNLV Retrospective Theses & Dissertations

Mark Twain reprinted fifteen sketches from the Buffalo Express in his 1875 subscription volume entitled Sketches, New and Old, and eighteen were printed in the Galaxy around the time of their appearance in the Express. Since that time, "Journalism in Tennessee," "Capitoline Venus," "A Ghost Story," "A Curious Dream," and a few others have been anthologized, most recently in Louis J. Budd's Mark Twain: Collected Tales, Sketches, Speeches, & Essays (2 vols., 1991). However, except for their original newspaper printing, the signed sketches have yet to be published in their entirety as a volume. This study is a critical edition …

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Technology Use By A College Of Education Faculty And Factors Influencing Integration Of Technology In An Undergraduate Teacher Preparation Program, Christy J Falba Jan 1997

Technology Use By A College Of Education Faculty And Factors Influencing Integration Of Technology In An Undergraduate Teacher Preparation Program, Christy J Falba

UNLV Retrospective Theses & Dissertations

This study describes current levels of technology use by a College of Education (COE) faculty and use of technology in teaching classes. In addition, the formation of a systematic plan for integrating technology throughout the teacher preparation programs was explored. Both quantitative and qualitative methods were used in this two-phase study; Phase I survey results suggested that although 93% of faculty believed technology in teacher education was very important or somewhat important, use of technology in teaching was limited. Consistent with previous findings on university faculty use of technology, COE faculty rated themselves as having high levels of knowledge and …

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Modeling Temporal Variations In Travel Demand For Intelligent Transportation Systems, Srinivas Subrahmanyam Pulugurtha Jan 1997

Modeling Temporal Variations In Travel Demand For Intelligent Transportation Systems, Srinivas Subrahmanyam Pulugurtha

UNLV Retrospective Theses & Dissertations

The imbalance between demand and supply on transportation networks, especially during peak periods, leads to significant level of congestion. Potential solutions to alleviate congestion problems include enhancing system capacity and effective utilization of available capacity--i.e., traffic demand management. Intelligent transportation system (ITS) initiatives such as travel demand management systems (TDMS) and traveler information systems (TIS) refer to demand management as an objective. The success of these initiatives rely heavily on an ability to accurately estimate the temporal variations in travel demand in near real-time. The focus of this dissertation is on developing a methodology for estimating temporal variations in travel …

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Faculty Attitudes Toward Distance Education In Utah Public Colleges And Universities, Arthur Thomas Challis Jan 1997

Faculty Attitudes Toward Distance Education In Utah Public Colleges And Universities, Arthur Thomas Challis

UNLV Retrospective Theses & Dissertations

The purpose of this study was to obtain faculty attitude information toward distance education at the Utah public colleges and universities. Faculty attitudes were deemed important with more and more money being allocated in Utah to the development of distance education; A survey of Utah public higher education faculty was conducted in the fall of 1997. The survey achieved a 66% return rate, a total of 421 faculty members; The survey found that 95% of the Utah faculty was familiar with distance education and that a high number would be willing to teach distance courses, even if they hadn't already …

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Habitat Patch Dynamics Of Desert Bighorn Sheep Ovis Canadensis Nelsoni In The Eastern Mojave Desert, Darren Del Divine Jan 1997

Habitat Patch Dynamics Of Desert Bighorn Sheep Ovis Canadensis Nelsoni In The Eastern Mojave Desert, Darren Del Divine

UNLV Retrospective Theses & Dissertations

The individual chapters of this Dissertation were designed to examine desert bighorn habitat, and the disjunct nature of that habitat. The findings of the first chapter illustrated that although 30 m elevation data yielded a more accurate depiction of the landscape, 100 m data was still adequate for determining habitat quality. The second chapter illustrated that the traditional bighorn habitat model was inadequate when applied to four Eastern Mojave Desert mountain ranges because of its unrealistic distance to permanent water requirement. It was also determined that a single habitat definition could not be formulated that worked equally well on all …

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A History Of Changes In The Policies And Practices Of Second Language Programs In The Public Schools Of Clark County, Las Vegas, Nevada, Mark Jose Dominguez Jan 1997

A History Of Changes In The Policies And Practices Of Second Language Programs In The Public Schools Of Clark County, Las Vegas, Nevada, Mark Jose Dominguez

UNLV Retrospective Theses & Dissertations

A History of Changes in the Policies and Practices of Second Language Programs in the Public Schools of Clark County, Las Vegas, Nevada is an historical study that traced the development of Second Language Programs in the Clark County School District, Las Vegas, Nevada. The research study examined national and federal actions which served as the bases for the initial implementation of Second Language Programs (1880-1998), historical sequential activities in Nevada that contributed to the implementation of Second Language Programs in the state, and the sequential activities that specifically dealt with the development of Second Language Programs in the Clark …

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A Study To Determine The Impact Of Summer Teacher Externships On Curriculum And Teaching Methods, Andrea C Anderson Jan 1997

A Study To Determine The Impact Of Summer Teacher Externships On Curriculum And Teaching Methods, Andrea C Anderson

UNLV Retrospective Theses & Dissertations

The purpose of this dissertation was to examine the effectiveness of summer teacher externships on affecting change in a teacher's curriculum or method of instruction so that students are better prepared to meet the employment needs of business and industry upon graduation; The federal School to Work Opportunities Act of 1994 was designed to create the mechanism to promote a partnership between education and business. The goal of this partnership is to involve business in education, and educators in business, in order to give America's students the high skills needed to compete in today's global economy; One of the programs …

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Exercising Authority: A Critical History Of Exercise Messages In Popular Magazines, 1925-1968, Dahn Edward Shaulis Jan 1997

Exercising Authority: A Critical History Of Exercise Messages In Popular Magazines, 1925-1968, Dahn Edward Shaulis

UNLV Retrospective Theses & Dissertations

The purpose of this study was to analyze exercise messages in American popular magazines. A critical perspective and historical sociological methods were used to examine more than 500 magazine articles published from 1925 to 1968. A common factor in many articles was the use of ideology mixes. Magazines used biomedicalization, materialism, nationalism, and patriarchy in several combinations to authorize restrictive exercise norms. Exercise norms were stratified by age, class, gender, and race, but changing ideology mixes and exercise norms often reflected changes in society. Biomedicalization authorized doctors as gatekeepers. It prescribed moderate activity for affluent men, but discouraged vigorous exercise …

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The Institutional Control Of Ncaa Division One Collegiate Athletics, Burton Larry Easley Jan 1997

The Institutional Control Of Ncaa Division One Collegiate Athletics, Burton Larry Easley

UNLV Retrospective Theses & Dissertations

The control of collegiate athletics has been a matter of concern since the earliest days of college sports competition. In 1952, the National Collegiate Athletic Association instituted policies that included the ability to impose sanctions on colleges that violated recruiting guidelines, eligibility requirements, and other rules. Its lack of investigative and policing resources, however, left the NCAA with limited ability to enforce these policies. As a result, the organization placed the responsibility for control of institutional athletics on the school itself and its chief executive officer based on the reasoning that many problems involving violations of regulations would be solved …

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The Racing Of American Society: Race Functioning As A Verb Before Signifying As A Noun, John A. Powell Jan 1997

The Racing Of American Society: Race Functioning As A Verb Before Signifying As A Noun, John A. Powell

Minnesota Journal of Law & Inequality

Symposium: Our Private Obsession, Our Public Sin

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The Effects Of Early Intervention On Young Handicapped Children Who Are Nonverbal Or Have Limited Expressive Language Skills, Joyce Mott Anderson Jan 1997

The Effects Of Early Intervention On Young Handicapped Children Who Are Nonverbal Or Have Limited Expressive Language Skills, Joyce Mott Anderson

UNLV Retrospective Theses & Dissertations

The purpose of this study was to investigate the impact of early intervention services on sixteen young handicapped children who were nonverbal or exhibited limited expressive verbal skills. It was proposed that these children would make gains in all areas of development including cognitive, receptive language, expressive language, fine motor, gross motor, self-help, and social/emotional as a result of carefully and systematically planned intervention. The subjects in this study had expressive language delays ranging from eight to thirty-three months. All children participated in an early intervention learning center that provided services noncategorically using a wholistic and transdisciplinary approach; The findings …

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Heat Shock Proteins As Indicators Of Environmental Stress, Arthur Louis Castle Jan 1997

Heat Shock Proteins As Indicators Of Environmental Stress, Arthur Louis Castle

UNLV Retrospective Theses & Dissertations

In order to determine whether heat shock proteins (HSP) can be used as indicators of environmental stress in the mammalian organism Peromyscus leucopus, three doses of each of two chemical stresses, cadmium chloride and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), were given intraperitoneally for 14 days. Proteins extracted from liver samples were compared by one-dimensional gel electrophoresis to liver protein samples from heat shocked and control animals. HSPs of 105,78, and 43 kDa were cadmium inducible. Non-heat shocked cadmium inducible proteins of 118, 55, and 47 kDa were seen. 2,4,5-T induced an increase in a 91 kDa protein. Low level cadmium induction of …

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A Matter Of Faith: A Study Of The Muddy Mission, Monique Elaine Kimball Jan 1997

A Matter Of Faith: A Study Of The Muddy Mission, Monique Elaine Kimball

UNLV Retrospective Theses & Dissertations

Leonard J. Arrington wrote about the Mormon development of the Great Basin from 1847 to 1900 in Great Basin Kingdom (1966). He summarized Mormon economic ideals in seven principles which served as the basis of his argument about their success in the Great Basin; The Muddy Mission, established on the Muddy River (Nevada) in 1865, served three purposes, foremost was cotton production. Church leaders believed that the successes experienced in Utah would be repeated in the southern regions. Unfortunately, by 1871 politics and economics ended any successes the Muddy Mission had; Arrington's principles represent a Mormon's ethnographic statement about the …

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Attorney Advertising: The Effect On Juror Perceptions And Verdicts, Stephanie Moore Myers Jan 1997

Attorney Advertising: The Effect On Juror Perceptions And Verdicts, Stephanie Moore Myers

UNLV Retrospective Theses & Dissertations

This study examined the effect of attorney television advertising on jurors. Southern Nevada jurors who had served on personal injury and malpractice trials were sent survey questionnaires designed to elicit juror attitudes about attorneys and attorney advertising. The response rate was 53.3%; The major finding was that although respondents generally do not like lawyer television advertising, it does not affect their trial verdicts unless jurors are actually confronted with a plaintiff's lawyer who advertises on television; then, jurors tend to vote for the defense. There is strong sentiment that the law should be changed to limit jury awards. Advertising lawyers …

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Factors That Contribute To The Progress Of High School Students In A College Distance Education Course, Joni M. Flowers Jan 1997

Factors That Contribute To The Progress Of High School Students In A College Distance Education Course, Joni M. Flowers

UNLV Retrospective Theses & Dissertations

This dissertation examined the factors that contributed to the high school students' progress in a college-level, distance education course. Four high school students, two seniors and two juniors, were selected to participate in the study. They were simultaneously enrolled in high school and the college distance education course. The researcher in the study was also the instructor. Her lectures were presented to the students via prerecorded videotapes. The college course involved the use of three distance education technologies: video-based instruction, email, and the World Wide Web; A qualitative methodology using a multiple case study design was used in this study. …

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