Digital Commons Network^™

A Complete Model Characterization Of Brushless Dc Motors, N. Hemati, Ming-Chuan Leu

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The modeling problem associated with brushless DC motors (BLDCMs) with nonuniform air gaps which operate in a range where magnetic saturation may exist is addressed. The mathematical model, includes the effects of reluctance variations and magnetic saturation to guarantee proper modeling of the system. An experimental procedure is developed and implemented in a laboratory environment to identify the electromagnetic characteristics of a BLDCM in the presence of magnetic saturation. It is demonstrated that the modeling problem associated with this class of BLDCM can be formulated in terms of mathematically modeling a set of multidimensional surfaces corresponding to the electromagnetic torque …

Enhanced Polarization Of Electron Spins In He4 By Simultaneous Optical Pumping With Circularly And Linearly Polarized Resonance Radiation, Laird D. Schearer, Padetha Tin

Physics Faculty Research & Creative Works

The polarization of helium (2³S₁) metastable atoms saturates at 50% when the ensemble is optically pumped with the D0 (2³S₁-2³P₀) transition. We have obtained polarizations approaching 100% with a simple, straightforward modification to the conventional experimental arrangement. The addition of a small amount of -polarized D₀ light incident on the cell perpendicular to the defining field direction doubles the polarization produced by circularly polarized + light along the field direction. A simple rate-equation model illustrates the enhancement. © 1990 The American Physical Society.

Rotational Effects In The Continuous Vacuum-Ultraviolet Fluorescence Spectrum Of H2 Associated With Spontaneous Dissociation, H. Schmoranzer, T. Noll, E. Roueff, H. Abgrall, Ronald James Bieniek

Physics Faculty Research & Creative Works

The effects of rotational-vibrational interaction, and of rotational coupling between the B 2p u+1 and C 2p u1 electronic states, on the B X fluorescence continuum of H2 associated with spontaneous dissociation were investigated spectroscopically using monochromatized synchrotron radiation for selective excitation of rovibronic states. The rotational shifts and perturbations in the modulated continua intensities observed agree well with close-coupling and Jeffreys-Wentzel-Kromers-Brillouin (JWKB) calculations also performed and are explained in terms of nonadiabatic coupling effects and rainbow-interference structures. A straightforward experimental technique is described to detect mixed electronic states. © 1990 The American Physical Society.

A Process Writing Curriculum For Kindergarten Through Third Grade, Patricia P. Dukes

UNF Graduate Theses and Dissertations

The curriculum that has been developed for this project is designed to promote the implementation of process writing in kindergarten through third grade classrooms. Writing activities are planned within the content areas and present writing as a natural way to communicate throughout daily activities.

The review of research reflects over fifteen years of work that has predominantly been carried out in classroom settings with elementary school students and teachers. Patterns of writing development have been identified that indicate a positive correlation between the students skills attainment and purposeful reading and writing experiences.

The plan incorporates individualized instructional strategies that have …

A Manual For Child-Created Video Production For Use By Classroom Teachers, Jean M. Hogan

UNF Graduate Theses and Dissertations

We are living in an information based society that has resulted in the availability of new technology for use by students and teachers. The video camera is an ideal tool for disseminating information and teaching skills; it is easy to use, produces immediate results and feedback, and catches the students' attention in an instant. Yet, many teachers shy away from incorporating the video camera as a part of their classroom curriculum. Some are wary of the camera itself. Others fail to see its potential as a part of their classroom curriculum since there are already many skills to be taught …

A Comparison Study Of Kindergarten Retention Rate And Implementation Of Developmental Kindergarten, Toni Lane Dorsett Tennent

UNF Graduate Theses and Dissertations

In an attempt to help developmentally young children experience success, many schools have established developmental kindergarten programs. An ex post facto study of a developmental kindergarten program in a Florida elementary school examined 598 student records covering five school years. Overall kindergarten retention rates before and after the implementation of the developmental kindergarten program were compared. Entry age, gender, and class size as factors in retention were also analyzed. A comparison of the entry age, gender, and kindergarten retentions before and after implementation of developmental kindergarten was also undertaken. Results of chi-square analyses showed no significant effects upon kindergarten retentions …

Adaptive Histogram Equalization, A Parallel Implementation, Charles W. Kurak Jr.

UNF Graduate Theses and Dissertations

Adaptive Histogram Equalization (AHE) has been recognized as a valid method of contrast enhancement. The main advantage of AHE is that it can provide better contrast in local areas than that achievable utilizing traditional histogram equalization methods. Whereas traditional methods consider the entire image, AHE utilizes a local contextual region.

However, AHE is computationally expensive, and therefore time-consuming. In this work two areas of computer science, image processing and parallel processing, are combined to produce an efficient algorithm. In particular, the AHE algorithm is implemented with a Multiple-Instruction-Multiple-Data (MIMD) parallel architecture. It is proposed that, as MIMD machines become more …

Monitored Residential Space Cooling Electricity Consumption In A Hot-Humid Climate: Magnitude, Variation And Reductionfrom Retrofits, Florida Solar Energy Center, Danny Parker

FSEC Energy Research Center®

There are few end-use studies that report monitored space cooling energy consumption for residential buildings in hot-humid climates. This paper reports data from 25 occupied single-family houses in Palm Beach County, Florida (Messenger et.al. 1982). The houses were first monitored for one year in 1981 to establish their space cooling consumption. After the first year of monitoring they received a battery of retrofits predicted to reduce household energy use. Incorporated measures included conversion to high-efficiency air conditioners or heat pumps, added ceiling insulation, window films, awnings, zoned conditioning systems and ceiling fans. The houses were then monitored for an additional …

A Survey Of Diplomatic And Commercial Relations Between The United States And Oman In Zanzibar, 1828-1856, Mohammed Al-Mukadam

Dissertations and Theses

Informal relations between American merchant traders and the Sultanate of Oman in the port of Zanzibar began with the landing of the first American merchants about 1828. At the same approximate time, Sultan Said bin Sultan moved his official residence from Muscat, Oman, to Zanzibar, underlining the importance of Zanzibar to the administration of his territories on the East African coast. Relations were formalized by the Treaty of 1833 between the United States and Oman, and the U.S. established a consular mission in Zanzibar in 1837 and in Muscat in 1838.

The growth of the Omani Empire under Sultan Said …

On A Women's Language, Tamara Brown

Dissertations and Theses

Assessing the feminist belief that women have a perspective dramatically differing from the patriarchal perspective, and that this viewpoint is, or could be, couched in a language differing from the norm, this researcher addressed the following three questions: (1) is there a definition of a women's language? (2) does a women's language exist? and (3) if a women's language does exist, in what form does it exist? These questions engendered feminist rhetorical criticism on the work of two radical feminists well known for their interest in, and attention to, the issue of a women's language.

Analysis And Numerical Simulation Of The Ground Water System At The Bonneville Navigation Lock Site, Oregon, Dirk Baron

Dissertations and Theses

As part of the new navigation lock for Bonneville Dam a new water source for the Bonneville Fish Hatchery must be supplied. The hatchery is located on the Oregon side of the Columbia River downstream of the dam. It requires large quantities of water free from chemical and biological contamination. In addition, the water has to be in a narrow temperature range. Currently the fish hatchery receives its water from a well field that is located on the alluvial terrace downstream of Bonneville Dam. The well field lies in the proposed approach channel for the new lock and has to …

Study Of Referential And Display Questions And Their Responses In Adult Esl Reading Classes, Susan Lindenmeyer

Dissertations and Theses

The technique of asking questions in the classroom has prevailed in first language classes for many years. This teaching technique has also been widely used in ESL reading classes. Though there has been extensive research about teachers' questions and students' responses in first language classrooms, there is a paucity of studies in second language classrooms.

This is a descriptive study of six experienced college level English as a Second Language (ESL) teachers and their discussions of the same reading selection with ninety-eight non-native speakers in each of their classes. Teacher-led discussions were audiotaped and twenty minutes of each class were …

Prediction Of Posttreatment Level Of Functioning From Performance In A Leveled Token Economy For Emotionally Disturbed Adolescents, Peter Arden Scott Grover

Dissertations and Theses

This study examined the relationship between performance in a leveled token economy for emotionally disturbed adolescents and posttreatment level of functioning six months after discharge from the target program. The target program for the study is an acute care psychiatric hospital which specialized in the treatment of adolescents with both emotional and substance abuse problems. Previous literature on the outcome of token economy treatment programs however for they adolescents have generally been favorable have typically not examined level of functioning as an outcome criteria.

Speechreading Ability In Elementary School-Age Children With And Without Functional Articulation Disorders, Barbara L. Habermann

Dissertations and Theses

The purpose of this study was to compare the speechreading abilities of elementary school-age children with mild to severe articulation disorders with those of children with normal articulation. Speechreading ability, as determined by a speechreading test, indicates how well a person recognizes the visual cues of speech. Speech sounds that have similar visual characteristics have been defined as visemes by Jackson in 1988 and can be categorized into distinct groups based on their place of articulation. A relationship between recognition of these visemes and correct articulation was first proposed by Woodward and Barber in 1960. Dodd, in 1983, noted that …

The Creation Of A Core Vacabulary For Initial Lexicon Selection For Nonspeaking Preschool Children, Lillian May More

Dissertations and Theses

The selection of the initial lexicon is one of the most important decisions made in the implementation of augmentative communication systems with preliterate, nonspeaking preschool children. If a communication aid is to be adopted by a child, the words available on the device must be interesting to the child and encourage communication. The vocabulary must allow for cognitive growth and foster language development. Ideally, a lexicon would be customized for each nonspeaking child's particular interests, vocabulary needs and developmental level. The reality is that vocabulary selection is a difficult and time consuming process. Parents and clinicians do not always have …

Spatial Manipulation As A Covariant Of Mental Practice, Vincent James Wolff

Dissertations and Theses

This experiment examined the relationship between a subject's ability to manipulate spatial relationships and utilize mental practice in the mirror drawing ability of 45 naive volunteer college students, using a six-pointed star track. The spatial manipulation abilities of all subjects were assessed with the Minnesota Paper Form Board Test, after which the subjects were divided into three treatment groups (no practice, mental practice, and physical practice) of 15 subjects using a blocked random design based upon their MPFBT scores. All three groups were trained in the mirror drawing task and given three physical practice pre-trials for familiarization. The physical practice …

The Unified Speech Period Of A Bilingual Child, Gary Frank Wood

Dissertations and Theses

Previous studies of bilingual infants learning their languages simultaneously have suggested that such children go through what is known as a unified speech period in which they make no differentation between the languages in question and in which they frequently use mixed utterances (Arnberg, 1987; Grosjen, 1982; Leopold, 1939; & Skutnabb-Kangas, 1981). To test the validity of the claim that there is such a period, an English-Japanese bilingual child from one year and six months of age (1;6) through two years and six months of age (2;6) was observed and his speech recorded.

A Theoretical And Experimental Study Of The Three-Ring Electrostatic Electron Lens, Thomas Anthony Sommer

Dissertations and Theses

A theoretical and experimental study of the three-ring electrostatic lens is presented. The lens consists of three isolated ring-shaped conductors, equally spaced along a common axis of symmetry. When appropriate potentials are applied to the conductors an electric field is produced near the axis which is capable of focusing a collimated beam of electrons. In the theoretical study the charge density method is used to find a closed-form solution for the field. This method approximates the field by replacing each ring with an infinitely thin hoop of uniform charge. The radial and axial equations of motion are then solved numerically, …

Phrasal Verbs In Academic Lectures, Robert D. Pierce

Dissertations and Theses

Phrasal verbs are a pervasive and distinctly Germanic part of the spoken English language that has been alive for centuries. They have preceded American history, and yet considered to be "the most active and creative pattern and word formation in the American language" (Meyer, 1975). Distinctly colloquial, idiomatic and varying in shades of literalness and figurativity, phrasal verbs are largely dominant in casual usage, such as conversation, while the Latinate verbs of English are dominant in formal usage, such as in making reports (McArthur 1989). While foreign educators and their students, such as from Chinese countries, are found to emphasize …

Exurban Commuting Patterns: A Case Study Of The Portland Oregon Region, Judy Seppanen Davis

Dissertations and Theses

Many North Americans have been moving to exurbia --low density, rural housing within the commuting range of urban areas. It has been assumed that employment is a major link. of exurban households with urban areas. It has been assumed that employment is a major link. of exurban households with urban areas. This analysis of exurban commuting patterns is based on a mail survey of 1408 households who bought homes in 1987 near Portland, Oregon. The bid-rent model of urban form predicts that exurbanites will trade-off long commutes for lower housing prices. But previous research suggests that exurban living may not …

The Overage Student: Candidate For School Failure, Virginia Homeier Anderson

Dissertations and Theses

This study, conducted in a suburban school district, examined academic achievement and demographic considerations for a group of students overage for their respective grades. Records of 127 subjects were examined and data collected with respect to student performance on academic indicators of at risk behavior. Indicators were scores on criterion referenced tests in reading and mathematics as well as school absence figures for all subjects. These data were subjected to ANOVA and Chi Square Tests of significance to ascertain if there were differences between the students who were overage due to in-grade retention and those overage for other reasons. Research …

Chemistry Of Pentafluorothio (Sf5) Alkyl Derivatives, Rolf Walter Winter

Dissertations and Theses

Part I describes the preparation of a number of useful intermediates from the sultone F₅SCHCF₂OSO₂ (1). These intermediates include the following: the ketene F₅SC(SO₂)=C=O (21), the unique sultone F₄S=CCF₂OSO₂ (23), and various ionic intermediates of the form Y⁺ [F₅SC(SO₂F) COX]^-. These intermediates play an important role in providing new pathways for preparing fluorosulfonic acid precursors. Fluorosulfonic acids are excellent candidates to improve the efficiency of environmentally safe fuel cells. It was possible to obtain new derivatives of 1 by …

Citizenship, Alienage, And Ethnic Origin Discrimination In Employment Under The Law Of The United States, Mack Player

Faculty Publications

INTRODUCTION

This paper will survey the federal law of discrimination in employment based on ethnic origin, alienage, and citizenship. There are a number of sources of this law, many of them overlapping. The federal constitution provides some protections, but only to governmental employees or applicants. The traditional centerpiece of employment discrimination law is Title VII of the Civil Rights Act of 1964. The 1866 Civil Rights Act also provides protection which overlaps with that provided by Title VII. Finally, the recently enacted Immigration Reform and Control Act of 1986 regulates both national origin discrimination, thus duplicating the protections of Title …

Christ-Centered Discipleship: A Biblical Concept Of Religious Education, Myung Soo Cho

Dissertations

Concomitant with increased concern for church growth in the 1950s was a new awareness of the importance of discipleship. From the days of Jesus to the present, the concept of discipleship has changed greatly. The problem of this investigation was to identify a Biblical concept of discipleship.

It was hypothesized that the relationship of Jesus with His Heavenly Father was the model for Jesus' discipleship with the Twelve apostles and other disciples. The primary objective was to identify principles form this Christ-centered discipleship that could provide a theoretical framework for Christian religious education.

The historical development of the Rabbinic schools …

Enlightened Social Insurance In A World Made Safer, Stephanie M. Wildman

Faculty Publications

No abstract provided.

Exorcising The Bugaboo Of "Comparable Worth": Disparate Treatment Analysis Of Compensation Differences Under Title Vii, Mack Player

Faculty Publications

No abstract provided.

Time To Abolish Implied Assumption Of A Reasonable Risk In California, Stephanie M. Wildman, John C. Barker

Faculty Publications

No abstract provided.

Transparency, Opacity, And Openness In Narrative, H. Jefferson Powell

Faculty Scholarship

No abstract provided.

Goldstein On Copyright Law: A Realist’S Approach To A Technological Age, Jerome H. Reichman

Faculty Scholarship

No abstract provided.

Jurisdictional And Transfer Proposals For Complex Litigation, Thomas D. Rowe Jr.

Faculty Scholarship

No abstract provided.