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Dynamic Behavior Of Co₂ Lasers, Li Zhang

Dissertations and Theses

Spontaneous pulsations have been observed in the output of a CO₂ laser. The temporal waveforms, transverse mode patterns, and laser lines are simultaneously measured under various operation conditions. The experimental data show that these pulsations have a direct connection with the transverse modes. We interpret the oscillations as being caused by mode beating, and the frequency shift of the oscillation as resulting from mode pulling. The theoretical explanations for these effects are in good agreement with the experimental results.

Endless State-Of-Polarization Control For Coherent Optical Communication Systems Using Nematic Liquid Crystal, Scott H. Rumbaugh

Dissertations and Theses

One of the obstacles to coherent fiber-optic communications is the unpredictable polarization drift which necessitates the use of an active polarization controlling system to match the polarizations of the signal and local oscillator. The polarization match must be maintained during the reset of any of the finite range components to prevent loss of data. We present a novel and practical system which uses three liquid crystal devices for the polarization matching process. Also, the required reset control algorithm and its derivation are described in detail.

An Approach To Pattern Recognition Of Multifont Printed Alphabet Using Conceptual Graph Theory And Neural Networks, Ihab A. Harb

Dissertations and Theses

This thesis describes an approach for accomplishing a pattern recognition task using conceptual graph theory and neural networks (NNs). The set of patterns to be recognized are the capital letters of six different fonts of the English alphabet, plus two shifted and six rotated versions of each. The letters are represented to the neural network on a 16x16 input grid (256 "sensor lines"). A standard classification encoding for such patterns is to use a 26-bit vector (26 lines at the NN's output), one bit corresponding to each letter. Experiments with such an encoding yielded results with poor generalization capability. A …

Intercultural Adjustment Problems Of Costa Rican Students In The United States, Patricia Gonzalez

Dissertations and Theses

The purpose of this study is to determine the adjustment problems Costa Ricans face while living and studying in the United States. The main concern of this thesis is to identify the intercultural communication problems that arise fundamentally from differences in value systems.

Cultural Value Differences In Arguments Between Presidents Ronald Reagan And Oscar Arias, Juan Carlos Flores

Dissertations and Theses

Costa Rica embodies many of the characteristics which the United States would like to foster in Central America and elsewhere. In recent years, however, misunderstandings have often been present in the development of relations between both nations, and leaders. These differences have been particularly visible between Presidents Reagan and Arias when carrying out their foreign policies towards Central America.

Recent developments in warfare, social and political unrest and economic crises in the region added to the emergence of a Central American political leadership--independent of U.S. decision making-have increased international misunderstandings between both political speakers. These misunderstandings are shown by Reagan …

Every Man Crying Out: Elizabethan Anti-Catholic Pamphlets And The Birth Of English Anti-Papism, Carol Ellen Wheeler

Dissertations and Theses

To the Englishmen of the sixteenth century the structure of the universe seemed clear and logical. God had created and ordered it in such a way that everyone and everything had a specific, permanent place which carried with it appropriate duties and responsibilities. Primary among these requirements was obedience to one's betters, up the Chain of Being, to God. Unity demanded uniformity; obedience held the universe together. Within this context, the excommunication of Elizabeth Tudor in 1570 both redefined and intensified the strain between the crown and the various religious groups in the realm. Catholics had become traitors, or at …

Energy Cost Of Resistive Exercise, Jan A. Polychronis

Dissertations and Theses

The energy cost of performing 1 and 3 sets of strength-type (6-8 RM) and endurance-type (30-35 RM) bench press exercise was estimated by indirect calorimetry in 10 male college students.

The total net energy cost of performing 3 sets of endurance-type resistive exercise (20.57 ± 1.86 kcal) was significantly (p <.05) greater than strength-type resistive exercise (15.24 ± 1.51 kcal) (mean ± SEM). Results were similar when energy cost was expressed relative to lean body mass. However, when expressed relative to the amount of work performed (kcal•kgm^-1) the strength-type exercise (2.35 ± 0.19) resulted in a significantly (p <.05) greater expenditure of energy than did endurance-type exercise (1.64 ± 0.30). The energy cost relative to work performed was found to be significantly greater for 1 set of strength-type exercise than for any other condition (p <.05). The relationship between the energy cost of 1 set, multiplied by 3, and 3 sets was r=0.64 for endurance-type exercise and r=0.27 for strength-type exercise.

It was concluded that compared to strength-type resistive exercise, endurance-type resistive exercise requires a greater net energy expenditure. The results suggest that endurance-type exercise be performed by individuals who wish to expend the greatest amount of energy …

The Effect Of Media On The Listening Comprehension Scores Of Intermediate Esl Students, Marian Tyson

Dissertations and Theses

The use of videotapes has become widespread in ESL classes in recent years. The decline in cost of tapes and VCR equipment has assisted in the spread of this technology. These tapes are often used in listening comprehension classes and may replace or supplement the use of audiotapes. However, research has not established that the addition of the visual element, especially in the movie or TV type context of many videos, is an advantage to the language learner.

A total of seventy-six students participated in a listening comprehension recall exercise. Thirty-nine students viewed a videotape segment, and the remaining thirty-seven …

An Analysis Of Us/Soviet Arms Control: Adding A Subsystem Perspective, Peter Millard Olson

Dissertations and Theses

Analyses of US/Soviet arms control have usually focused on domestic variables to explain US/Soviet arms control behavior. Partly because the number of negotiating parties is only two, there is a propensity to focus on the bilateral relationship of the United States and the Soviet Union and their respective domestic political situations. Only superficial attention has usually been given to international systems variables that may well influence the domestic political situation and arms control policy.

This thesis broadens the explanatory scope of US/Soviet arms control by showing how the political environment of a trilateral relationship (a subsystem that includes the West …

Hourly Fluctuation Of Middle Ear Pressure As A Function Of Age In School-Age Children, Susan Hogue Henry

Dissertations and Theses

Tympanometry is a useful means of evaluating the status of the middle ear. For the pediatric population, tympanometry is particularly valuable for determining the presence of middle ear effusion. The test has been incorporated in many school hearing conservation programs because of its ease of administration, objectivity, and diagnostic value.

In a study by deJonge and Cummings (1985), the hourly fluctuation of middle ear pressure was reported in a group of kindergarten-age children. The variability of middle ear pressure for that group of children averaged 150 daPa. In the present study, a maturational effect of this hourly fluctuation was observed …

A Comparative Study Of The Performance Of Various Image Analysis Methods For Dimensional Inspection With Vision Systems, Ralf Heinrich Koeppe

Dissertations and Theses

Dimensional inspection with Vision Systems requires a careful selection of image analysis methods in order to obtain accurate information about the geometry of the parts to be measured.

The purpose of this project is to study, implement and compare different image evaluation methods and to show their strengths and weaknesses with respect to dimensional inspection. Emphasis is made on the inspection of circular features. The criteria of comparison for these methods are discussed. Using synthetically generated images, various analysis methods are compared and conclusions for their use are drawn. Results of the comparison show that the selection of a method …

A Correlational Study Of Cognitive Style Measured By The Myers-Briggs Type Indicator And The Witkin Group Embedded Figure, Leith Wood Muessle

Dissertations and Theses

A review of the literature suggests a coincidence of personality characteristics among the cognitive styles defined by Field Dependence-Independence and the Myers-Briggs type preferences. This thesis proposed these independent measures of cognitive style tap common cognitive processes and hypothesized the Myers-Briggs dimensions of Extraversion-Introversion (EI), Sensing-Intuition (SN), and Judgement-Perception (JP) would correlate positively and Thinking-Feeling (TF) would correlate negatively with the dimension Field Dependence-Independence (FD-FI) as measured by the Group Embedded Figures Test (GEFT). The relationships of gender, age, and intelligence to the prediction of field-dependence-independence were also tested.

Blockmodeling Network Data From Six Small Towns: An Assessment Of Organizational Typologies, Peter J. Collier

Dissertations and Theses

A major question in the study of complex organizations is whether it is possible to develop a useful taxonomy which identifies the crucial aspects of organizations and classifies them in a significant manner. One group of typologies of complex organizations focuses on the relationship between the organization and its environment. The purpose of this thesis is to test the validity of three existing typologies of complex organizations, each of which focuses on one aspect of the relationship between organizations and their environment. The major innovation in this research is the use of block modeling, a form of network methodology, to …

The Congress Of Berlin Of 1878: Its Origins And Consequences, Kenneth Allen Shafer

Dissertations and Theses

Historians have expressed a variety of opinions concerning the true significance of the Congress of Berlin. While the 1878 meeting did not have to deal with questions as comprehensive as those discussed in Vienna in 1814-1815 or at Paris in 1856, the Congress of Berlin had great impact in its own right. While the Berlin meeting made decisions in order to reorganize the Balkans after years of instability and war, it also created a split in relations between the German Empire and Imperial Russia which would eventually drive the two powers towards conflict in "The Great War" in 1914.

Communication And Socialization Skills Of Three Year Olds With A History Of Language Delay, Pamela Susan Dahm

Dissertations and Theses

The purpose of this study was to compare receptive language, expressive language, and socialization skills of preschool children who have a history of expressive language delay (ELD) with age mates who have a history of normal language development.

The Degree Of Assimilation Of The Second And Third Generation Of Japanese Americans In The Portland Area, Hisako Matsuo

Dissertations and Theses

Japanese Americans have been identified as one of the most successful minority groups in the United States of America because of their achievement of high socioeconomic status. This study focuses on the degree and process of assimilation of Japanese Americans in this country in order to reconsider multiple assimilation theories of minority groups. Three questions were raised: 1) the extent to which both the second and third generation of Japanese Americans are assimilated into American society; 2) how far the third generation is assimilated compared to the second generation; and 3) what the identity of the second and third generation …

A Comparison Of The Maladaptive Behaviors Of Normal, Language Delayed, And Late Talking Toddlers, Denise Elaine James

Dissertations and Theses

People use language to communicate their needs and intentions, to express emotions, and to form relationships. It seems likely that a disruption in children's language development would have a negative impact on their social development. There is extensive research that shows that school age children with delayed language are "at risk" for increased maladaptive behaviors (Cantwell and Baker, 1977). Whether this is also true for children in the earliest stages of language development is not yet known.

The questions this study sought to answer were: 1) Is there a significant difference in the severity and frequency of maladaptive behaviors seen …

Enhanced Realism In The Development Of My Painting, Zifen Qian

Dissertations and Theses

It is a basic truth that the artist must have independent experience and personality in order to create art from life. Combining a traditional realistic style with some elements of abstract composition fits my personality. My paintings represent a pursuit of this idea that is the enhanced realism in the development of my painting.

The Effect Of A Video Presentation And Reference Guide Manual Of Helicopter Safety Instruction On The Knowledge Base Of Medical Transport Nurses, K. Linda Stickney

Dissertations and Theses

The purpose of this study was to evaluate the results of trained transport nurses being oriented to a new helicopter by a video presentation and reference guide manual educational program when compared with trained transport nurses being trained by actual hands-on demonstration. Using a posttest-only design and the t test for independent samples, it was found that the two groups of nurses did not differ statistically (t (9) = 0.318, p < .051).

A Comparative Analysis Of The Expressive Acquisition Of Locative And Directional Prepositions Between Severely-To-Profoundly Hearing Impaired Children Utilizing Total Communication And The Oral/Aural Approach, Cathleen Pew Edwards

Dissertations and Theses

Prepositions are not only important in functional syntax; they also relate meanings associated with the concepts of place and time. Furthermore, prepositions are critical in such everyday activities as producing and comprehending directions, using maps and diagrams, and in the fields of mathematics and music. Inefficient use or misuse of prepositional spatial terms may hinder a child's progress in many areas. Expressive acquisition of function words, which include prepositions, has been described as significantly delayed in the hearing impaired populations.

The purpose of this study was to conduct a comparative preposition analysis between hearing impaired children using two different modes …

A Comparison Of The Time Taken To Administer And Analyze Phonologic And Phonetic Tests, Beverly Alexander

Dissertations and Theses

The purpose of this study was to determine if the time it takes to complete a phonological test was significantly different than the time it takes to complete a phonetic test. It was hoped this study would identify an instrument that the public school speech-language pathologist could use more effectively and efficiently to analyze phonologically-impaired children.

Dudelsacks: Sculptural Extensions In Blown Glass, Cristine C. Corcoran

Dissertations and Theses

This thesis project consists of 19 sculptures. The medium is hot blown glass. The work interprets and extends the visual and metaphorical qualities of bagpipes. The utilization of the German dudelsack references the playful improvisational nature of these international and culturally diverse forms.

Chinese Voices: Towards An Ethnography Of English As A Second Language, Diane Niblack Fox

Dissertations and Theses

This study draws on ethnographic methods to provide background information for the English as a Second Language teacher who looks out at the classroom and asks, "Who are these Chinese students?" The goal is to let Chinese students describe for themselves their experiences learning English, both in China and in the United States.

The Application Of The Ordered List Method And The Dynamic Programming To The Unit Commitment, Hoang Uong

Dissertations and Theses

The thesis presents a method of committing generating units in a hydro-thermal power system within practical computer resources such as computer time and data storage.

Awareness Of Biculturalism In Families Of Intercultural Marriage, Eleesabeth Carol-Therese Vieira

Dissertations and Theses

The overall purpose of this preliminary study is to generate more information in the area of intercultural marriage. The specific objectives of the study are to explore the extent to which families of intercultural marriage are aware of the issues of biculturalism that are discussed as significant in the literature; the extent to which partners of intercultural marriage discuss these issues with one another or with their children; the extent to which the family members' subjective reports of "awareness" are consistent.

An Estimation Of Relatedness Within Two Oregon Populations Using Isonymy Analysis, Maria Michalczyk

Dissertations and Theses

The study of human relatedness has long interested the population geneticist. One technique for the estimation of population relatedness is the use of isonymy analysis. The isonymy inbreeding coefficient is analogous to Wright's inbreeding coefficient F. Isonomy analysis can yield comparable results to population studies done by other means such as pedigree analysis, serological studies, and anthropometric analysis.

The data used for this study was obtained from marriage records and telephone directories. Same last name marriages were observed for legitimacy and recorded when verified. A pool of last names were drawn from the marriage records. This list was used to …

Designing An Instructor's Manual For Introducing Cultural Concepts In The Medical School Curriculum, Barbara C. Nicodemus

Dissertations and Theses

Medical educators recognize the need for including cultural insights into the training of future physicians. This instructor's manual suggests selected journal articles and guidelines for their use in each of the clinical courses to illustrate the relevance of culture, inter- and intraethnic differences, an attitude of cultural relativity, and the importance of language use and communications skills for medical practice. The articles are found in journals typically available to medical students. This manual provides a baseline integrative approach applicable to other specialized training programs. A recommendation is made for evaluation and revision of history-taking interview forms to elicit additional culture-specific …

The European Neutrals In World War Ii, Jerrold Michael Packard

Dissertations and Theses

The thesis begins with a short section on the nature of neutrality in Europe in the 1930s, and briefly introduces the political circumstances of the six nations that remained neutral throughout the war. The primary subject of the paper deals with the relationship between the belligerents and the neutral states, especially the extent to which military strength and preparedness was responsible for the latter maintaining their neutrality.

Analysis Of Mitochondrial Dna Restriction Fragment Patterns In Killer Whales, Orcinus Orca, Tracy Alison Stevens

Dissertations and Theses

The mitochondrial DNA restriction fragment patterns of killer whales (Orcinus orca) were investigated in order to determine the level of genetic differentiation that exists between killer whales from various geographic locations. Twenty one killer whales were examined, seventeen of which were captive killer whales that originated from the North Atlantic and Northeast Pacific Oceans. Two were captive-born animals and two were killer whales that stranded along the Northeast Pacific coast.

DNA was extracted from blood and/or tissue samples, cleaved with a variety of restriction endonucleases and the DNA fragments were separated by horizontal agarose gel electrophoresis. The DNA …

Disfluencies In Normal Four-Year-Old Alaska Native And Caucasian Children, Annette Cameron O'Connell

Dissertations and Theses

The purpose of this study was to compare the frequency of occurrence of specific speech disfluencies in 4-year-old Alaska Native children to those of 4-year-old Caucasian children. Specifically, eight disfluency types were investigated: part-word repetition, word repetition, phrase repetition, interjection, revision-incomplete phrase, disrhythmic phonation, tense pause, and intrusive schwa. The questions addressed in the study were:

1. Do 4-year-old Alaska Native children exhibit a higher frequency of disfluencies than 4-year-old Caucasian children?
2. Do 4-year-old Alaska Native children exhibit a greater frequency of specific disfluencies, in terms of part-word repetition, word repetition, phrase repetition, interjection, revision-incomplete phrase, disrhythmic phonation, tense pause, or …