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An Investigation Of Hydrogen-Related Phenomenon And Compensation In Zinc Selenide Grown By Molecular Beam Epitaxy., Zhonghai Yu
An Investigation Of Hydrogen-Related Phenomenon And Compensation In Zinc Selenide Grown By Molecular Beam Epitaxy., Zhonghai Yu
Graduate Theses, Dissertations, and Problem Reports (ETD)
Both compensation and hydrogen-related phenomenon in ZnSe grown by MBE have been systematically investigated in this study. Atomic hydrogen is demonstrated to effectively clean GaAs substrates for subsequent growth of ZnSe by molecular beam epitaxy. Significant reduction of micro-defects in both undoped and nitrogen doped ZnSe is achieved using atomic hydrogen cleaning of GaAs substrate prior to ZnSe growth without any other treatment. The density of stacking faults in ZnSe is less than {dollar}\\rm1\imes10\\sp4\\ cm\\sp{lcub}-2{rcub}{dollar} in layers grown with atomic hydrogen cleaning, while it is greater than {dollar}\\rm1\imes10\\sp7\\ cm\\sp{lcub}-2{rcub}{dollar} in layers grown with conventional thermal cleaning. Optical microscopy is shown …
Eliciting Information About Knowledge Structures In Persons With Mild Or Moderate Mental Retardation Through The Use Of Dynamic Assessment And Prototype Theory., Mary Ellen Zeppuhar
Eliciting Information About Knowledge Structures In Persons With Mild Or Moderate Mental Retardation Through The Use Of Dynamic Assessment And Prototype Theory., Mary Ellen Zeppuhar
Graduate Theses, Dissertations, and Problem Reports (ETD)
Tests that are given to help determine the level of functioning of persons with mental retardation often rely on verbal report strategies. Because individuals with mental retardation have difficulty expressing themselves verbally, our knowledge of what they know is limited. In this study adults with mild and moderate mental retardation were administered the similarities section of the Wechsler Adult Intelligence Scale-Revised, a test of verbal responding, and then given the task of responding verbally or visually to stimulus categories, which were presented verbally or visually. All possible combinations of verbal and visual input and output were used in an assessment …
Studies On Molecular Mechanisms Of The Immunotoxic Effects Of Propanil On T Cell Development And Cytokine Production., Wei Zhao
Graduate Theses, Dissertations, and Problem Reports (ETD)
Propanil is a post-emergent herbicide which has been extensively used for control of weeds in rice and wheat field. Acute exposure to propanil central nervous system depression, loss of a righting reflex, and cyanosis. The immunotoxic effects of propanil on animals include reduction of thymus weight and cellularity with increase of spleen weight and cellularity, inhibition of humoral and cell-mediated immune response and alteration NK cell activity and macrophage cytotoxicity. The overall goal of this project is to investigate the mechanism and recovery of propanil induced thymic atrophy and the effect of propanil on T cell cytokine production. Using cell …
The Interrelation Of Gypsy Culture And School Culture: An Ethnography Study Of Interactions., Marina Izquierdo Carter
The Interrelation Of Gypsy Culture And School Culture: An Ethnography Study Of Interactions., Marina Izquierdo Carter
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purposes of this study were to gain an understanding of the Gypsy culture and to discover the relationship, within the school domain, between the Gypsy children and the non-Gypsy teachers. The study was conducted in Malaga, Spain and lasted two and a half months. The research design for this study was qualitative. Data for this ethnographic research were gathered using three strategies: (1) participant observations, (2) interviews, (3) collecting school magazines. Three models of analysis for collected data were used: Domain analysis, Cultural Themes analysis, and Code Analysis. The Gypsy participants were part of the population of the Gypsy …
Examining Template Switching During Retroviral Reverse Transcription., Ella Harvey Bowman
Examining Template Switching During Retroviral Reverse Transcription., Ella Harvey Bowman
Graduate Theses, Dissertations, and Problem Reports (ETD)
Currently, the Acquired Immune Deficiency Syndrome (AIDS) epidemic is world-wide and threatens the entire human population. The causative agent of AIDS is Human Immunodeficiency Virus (HIV), a retrovirus. The HIV viral population exhibits tremendous variation, making the development of vaccines difficult and anti-viral drug therapy ineffective due to the emergence of drug-resistant HIV strains. The main goal of this dissertation is to better understand how retroviral variation is generated to ultimately aid the development of effective anti-retroviral therapies and vaccines. The experiments described throughout this dissertation incorporate the use of simple retrovirus model systems to study template switching events during …
The Dynamic Ssi Of A Shallow Buried Plate Under Impact Loading., Shen-En Chen
The Dynamic Ssi Of A Shallow Buried Plate Under Impact Loading., Shen-En Chen
Graduate Theses, Dissertations, and Problem Reports (ETD)
Soil is a particulate material, which provides a unique behavior when interacting with its adjacent structure. The dynamic soil-structure interaction (SSI) phenomenon involving in a shallow-buried flexible plate under impact loading is studied. The objective of this study is to understand this interaction process, which has caused load-relieves on the buried plate. The investigation includes an experimental reproduction of the phenomenon and numerical simulation. Plexiglass plates were used as a buried flexible roof structure, and low-velocity impact loadings were generated into the soil. Measurements of the interaction loads between the sand and the plate, and the accelerations of the buried …
Analytical Characterization Of Semi-Volatile Organic Material In Coal And Coal-Related Products., Scott William Chervenick
Analytical Characterization Of Semi-Volatile Organic Material In Coal And Coal-Related Products., Scott William Chervenick
Graduate Theses, Dissertations, and Problem Reports (ETD)
The characterization of the semi-volatile organic content of coal and several N-methyl-2-pyrrolidinone (NMP) soluble coal extracts has been investigated using several analytical techniques, including gas chromatography mass spectrometry (GC/MS), Thermal Extraction (TE) GC/MS, Gel Permeation Chromatography (GPC), High Performance Liquid Chromatography (HPLC), Thermabeam LC/MS, Diffuse Reflectance FTIR (DRIFT), and Thermogravimetric (TGA) FTIR. Ultrasonic extraction was shown to be quicker than the traditional Soxhlet extraction technique as the first step in a solvent dissolution scheme for coal. The fractions resulting from the two techniques are similar based on characterization results obtained from HPLC, GPC, and TE-GC/MS experiments. TE-GC/MS was used to …
Energy Conservation Behavior: Description And Analysis Of The Energy Conservation Corps., Carolann Cook
Energy Conservation Behavior: Description And Analysis Of The Energy Conservation Corps., Carolann Cook
Graduate Theses, Dissertations, and Problem Reports (ETD)
The study examined behavioral, attitudinal, and demographic data from households which had participated in an on-site home energy audit service, the Energy Conservation Corps (ECC). Focusing on households which had received home energy audits from 1990 to 1992, the study was designed to develop a demographic profile of ECC audit program participants, ascertain ECC households' perceptions of the benefits of the program and of the influence of the audit on their energy-use behavior, identify factors associated with conservation behavior among ECC households, and obtain information useful in the design of energy education outreach programs. The sample consisted of 421 households …
A Study Of The Relationship Between School And District Office Linkage Patterns And The Implementation Status Of Key Middle Level Practices., Michael Lee Cunningham
A Study Of The Relationship Between School And District Office Linkage Patterns And The Implementation Status Of Key Middle Level Practices., Michael Lee Cunningham
Graduate Theses, Dissertations, and Problem Reports (ETD)
This study examined the relationship between middle school principals' perceptions of the linkage patterns of their schools with the district office and the perceived degree of key middle level practices implementation by the school. To examine this relationship, the Survey of Middle Level Education was designed using measures related to the work of Fullan (1991) and Louis and Niles (1990) regarding change implementation in schools. The basis for the survey items related to communication and control linkage patterns were Likert's (1967) studies of organizational systems. This survey, which was sent to 600 middle school principals, was also designed to indicate …
Nucleation And Growth Of Gan On Sapphire By Mbe, Steven Buczkowski
Nucleation And Growth Of Gan On Sapphire By Mbe, Steven Buczkowski
Graduate Theses, Dissertations, and Problem Reports (ETD)
GaN was grown by molecular beam epitaxy in an effort to determine nucleation and growth conditions which lead to high quality, single-crystal films. Atomic force microscopy (AFM) was used to show that growth under Ga-rich conditions promotes the nucleation of films with large nucleation domains leading to a lower density of intrinsic defects related to domain boundaries. These conditions are also shown to promote a 2-D growth mode resulting in films with a high degree of nucleation domain coalescence and surface roughnesses below 2 nm. Addition of atomic hydrogen, using a thermally-cracked source, is shown to increase the growth rate …
Families Of Premature Infants: An Analysis Of Physical Abuse Risk Factors., Kimberly J. Ujcich
Families Of Premature Infants: An Analysis Of Physical Abuse Risk Factors., Kimberly J. Ujcich
Graduate Theses, Dissertations, and Problem Reports (ETD)
Physical abuse of children is a major social issue affecting families. Children under the age of three, children with disabilities, and those born prematurely have each been shown to be high risk populations for experiencing physical abuse. This study investigated several child, family, and environmental factors associated with physical abuse within a population of children born prematurely. Forty-five mother-child dyads from each of three chronological age groups (6 months, 12 months, and 18 months) participated. Home sessions were conducted in which mothers completed questionnaires, children were assessed for developmental abilities, and mother-child dyads were observed during feeding interactions. Demographic and …
Vibration And Air-Resonance Stability Characteristics Of Helicopters Using Rotor-Body Dynamic Interaction., Senthilvel Vellaichamy
Vibration And Air-Resonance Stability Characteristics Of Helicopters Using Rotor-Body Dynamic Interaction., Senthilvel Vellaichamy
Graduate Theses, Dissertations, and Problem Reports (ETD)
Vibration and Air-Resonance stability characteristics of helicopters in forward flight are studied using rotor-body dynamic interaction. The rotor blade and fuselage are considered as flexible structures. The blade undergoes flap, lag, and axial motions and twist about the elastic axis. The air loads are based on quasi-steady aerodynamics and linear inflow model. The governing equations are generated by expanding the generalized forces in the Hamiltonian as a first-order Taylor series. The zeroeth and n/rev. vibratory loads are predicted directly in the fixed frame. This is expected to be more accurate than the force or modal summation methods. The blade controls …
Visual And Iconographic Design Principles: Implications For Computer-Assisted Instruction., Lindia Lee Gordon
Visual And Iconographic Design Principles: Implications For Computer-Assisted Instruction., Lindia Lee Gordon
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to provide educators and developers of computer-assisted instruction with a validated, concise list of visual and iconographic design principles that should be considered when designing graphical icons to stimulate learning as a part of the user interface of their courseware packages in order to create more effective learning. A panel of 12 experts in a modified Delphi study identified and validated visual and iconographic design principles necessary in the development of icons for CAI. As a result of this study, 37 visual and iconographic design principles were identified and validated. The final conclusions of …
A Cellular Model For Automatic Transport Systems., Yang Cai
A Cellular Model For Automatic Transport Systems., Yang Cai
Graduate Theses, Dissertations, and Problem Reports (ETD)
In this study, the Transit Automata (TA) model, a Cellular Automata (CA) based spatial model, has been developed. It includes a set of cells, states, rules, events, and a system clock. In contrast to CA, a TA model fragments the problem space along restricted routes. All cells on the routes are treated as equal and controlled by rules. Like CA models, an initial configuration of a TA model can be embedded and can be dynamically changed during the runtime. Furthermore, user-controlled events and stochastic events are used to trigger the discrete events of the model. A TA model is a …
Correlation Of In-Facepiece Sampling Methods Using A Simulated Health-Care Workplace Test., Christopher Charles Coffey
Correlation Of In-Facepiece Sampling Methods Using A Simulated Health-Care Workplace Test., Christopher Charles Coffey
Graduate Theses, Dissertations, and Problem Reports (ETD)
For a number of years, it was assumed that the protection measured during a laboratory fit test was indicative of the protection provided by the respirator during actual use in the workplace. Beginning in the early 1980's, workplace protection factor studies were conducted to validate this assumption. These studies indicated that quantitative fit test results did not correlate with actual workplace protection factors. A fit test that indicates the degree of exposure is especially important when Mycobacterium tuberculosis (TB) exposures are involved. This study tested the correlation of fit factors to the subject's actual exposure using biological sampling. Six quantitative …
Development Of Design Criteria For Long-Term Separation, Filtration And Drainage Behavior Of Nonwoven Geotextiles With Fly Ash., Mujahid Hussain Akram
Development Of Design Criteria For Long-Term Separation, Filtration And Drainage Behavior Of Nonwoven Geotextiles With Fly Ash., Mujahid Hussain Akram
Graduate Theses, Dissertations, and Problem Reports (ETD)
The long-term filtration behavior of six nonwoven geotextiles with fly ash from two different power plants was investigated. Five specimen preparation techniques were evaluated: Dry Method, ASTM Method (D 5101-90), Modified ASTM Method, Slurry Method, and Vibro-Prep. ASTM Procedure was modified. Vibro-Prep is a new technique to prepare specimens at higher density to simulate filtration behavior of nonwoven geotextiles in the field. In addition, a method was developed for testing of geotextiles under high hydraulic gradient (HHG). HHG method is an expedient technique to assess the long-term filtration behavior of geotextiles. The results of this investigation indicated that method of …
Nonlinear Chemical Dynamics: Competition And Convection Effects In Reaction-Diffusion Fronts And Controlling Chaos., Jonathan Masere
Nonlinear Chemical Dynamics: Competition And Convection Effects In Reaction-Diffusion Fronts And Controlling Chaos., Jonathan Masere
Graduate Theses, Dissertations, and Problem Reports (ETD)
Competition and convection effects in reaction-diffusion fronts and controlling chaos are studied. In Chapter 3 we report theoretical studies of competition in which two self-replicating organic molecules compete for a common reactant. We found that the self-replicating organic molecule can give sustained reaction-diffusion fronts. This phenomenon is investigated by numerical solutions of partial differential equations that couple local nonlinear kinetics and diffusion. Reaction-diffusion fronts involving competing species are then initiated and the concentration profiles of the autocatalysts monitored. The results show that the more reactive species totally predominates over the less reactive species as its front moves ahead into the …
Development And Assessment Of A Standard Dissolution Methodology For Protein-Based Injectable Suspensions., Sunil Prabhu
Development And Assessment Of A Standard Dissolution Methodology For Protein-Based Injectable Suspensions., Sunil Prabhu
Graduate Theses, Dissertations, and Problem Reports (ETD)
To date, no standard dissolution methodology is recognized in the official compendia for protein-based injectable suspensions. Development of a sensitive dissolution method would have utility as an in vitro quality control tool and an indicator of associated in vivo product performance. Using the spin-filter as the dissolution device of choice, the objective of these studies was to develop a standard dissolution methodology for protein-based suspensions. Secondarily, the objective was to elucidate the steps which critically influence ion-complexed protein dissolution, and assess the magnitude of their effect. In Phase I of dissolution methodology development, studies of the device hydrodynamics concluded that …
Use Of Prefabricated Vertical Drains (Pvds) For Enhanced Soil Flushing., John Dante Quaranta
Use Of Prefabricated Vertical Drains (Pvds) For Enhanced Soil Flushing., John Dante Quaranta
Graduate Theses, Dissertations, and Problem Reports (ETD)
The concept of using prefabricated vertical drains (PVDs) for remediation of contaminated sites with fine-grained soils is examined. The PVD system is used to shorten the drainage path of the groundwater flow and promote subsurface liquid movement expediting the soil flushing process. The use of PVDs in the current state of practice has been limited to soil improvement. The use of PVDs under vacuum conditions is investigated using study soils consisting of 100% sand and 80% sand/20% kaolinite mixture. PVD parameters evaluated included: Well Resistance, Zone of Influence, and Smear Effects. Applicability of the PVD soil flushing was evaluated through …
Costs Of Producing Transportation Fuel Oxygenates From Coal-Derived Alcohols., John E. Saymansky
Costs Of Producing Transportation Fuel Oxygenates From Coal-Derived Alcohols., John E. Saymansky
Graduate Theses, Dissertations, and Problem Reports (ETD)
Air pollution from automobiles is a serious problem in major metropolitan areas in the United States. It has been suggested that adding higher alcohols derived from coal to gasoline may help to reduce some of the more toxic emissions from automobiles and also extend the gasoline pool. The main objective of this study is to systematically assess the economic cost of producing coal derived alcohols for use in this capacity under conditions of uncertainty and to identify any relevant production and supply constraints. Four coal cases representing different feed-stocks and modem gasification technologies are employed in the analysis, and two …
Pearl Buck: A Cultural Bridge Across The Pacific., Kang Liao
Pearl Buck: A Cultural Bridge Across The Pacific., Kang Liao
Graduate Theses, Dissertations, and Problem Reports (ETD)
Pearl Buck was the first American woman writer who won the Nobel Prize for literature. However, she has been largely neglected by American critics since 1940. She was severely criticized in China in the 30s and 60s. Was she overestimated at first? Did she misrepresent China? What are the main values of her literary works? Are they still valuable today? This dissertation applies the reception theory to analyzing the reasons of her early and the ensuing neglect of her works by the critics, historicizes the significance of her function in changing the American image of the Chinese people, uses the …
Operating Characteristics And Stability Of Multiple-Fan Ventilation Systems., Shumin Lin
Operating Characteristics And Stability Of Multiple-Fan Ventilation Systems., Shumin Lin
Graduate Theses, Dissertations, and Problem Reports (ETD)
Augmented-system equations related to a subsystem of a multiple-fan ventilation system are established. It has been found that an augmented system has a unique solution curve and all the possible system solution points are located on the curve at the points where the augmented parameter has a zero value. The Quasi-Newton algorithm is then introduced and combined with the switching-parameter technique to form an effective and efficient numerical tool for identifying the solution curve and all the system operation points. Exemplary networks are analyzed using the new algorithm to demonstrate its superiority over all other methods available for analyzing ventilation …
The Relation Between Marital Conflict And Child Adjustment: An Examination Of Parental And Child Repertoires., Beverley Kim Beach
The Relation Between Marital Conflict And Child Adjustment: An Examination Of Parental And Child Repertoires., Beverley Kim Beach
Graduate Theses, Dissertations, and Problem Reports (ETD)
Impelled by research deficits identified by previous researchers, the relation between marital conflict and child adjustment was investigated within a repertoire-based paradigm to yield a more complete understanding of the etiology and maintenance of child adjustment problems. Specific parental and child affective, cognitive, and motoric conflict repertoires were obtained via an analogue task, and were related to 10 to 13 year olds' internalizing and externalizing problems. The correspondence between parental and child conflict repertoires was examined, as were the relations between intra-individual affective, cognitive, and motoric conflict responses. Findings further elucidated the relation between marital conflict and child psychopathology; specific …
Stress Distribution And Failure Mechanism Of Reinforced Concrete Column Subjected To Internal Explosive Charge., Yong-Suk Ro
Stress Distribution And Failure Mechanism Of Reinforced Concrete Column Subjected To Internal Explosive Charge., Yong-Suk Ro
Graduate Theses, Dissertations, and Problem Reports (ETD)
The concept of using explosives to demolish buildings and structures revolutionized the methods to eliminate the unsafe and unwanted structures efficiently and with minimum danger. The idea of demolishing buildings was introduced by CDI (Controlled Demolition Inc., Phoenix, Maryland) during the late 1960s, and the technique has become very popular ever since with numerous blasting agencies and construction companies opting to use explosives over conventional methods of demolition. Though the technique has been used for about a couple of decades, there has not been a unified theory developed to determine the quantity and type of explosive needed to demolish a …
The Effects Of Collaborative Learning On Writing Quality, Writing Apprehension, And Writing Attitude Of College Students In A Developmental English Program., Martha Boger Shrewsbury
The Effects Of Collaborative Learning On Writing Quality, Writing Apprehension, And Writing Attitude Of College Students In A Developmental English Program., Martha Boger Shrewsbury
Graduate Theses, Dissertations, and Problem Reports (ETD)
This study examined sixteen basic writers in a college developmental English program to ascertain what effect collaborative learning strategies would have on the writing apprehension, writing anxiety, and writing quality. Students operated in a collaborative environment: They followed a writing process and arrived at consensus within their group at each stage of writing. All writers still worried about their writing, but they collectively agreed that they spent more time on writing and rewriting. In short, writers had a vision of what they were expected to accomplish and demonstrated that writing was a powerful tool. This study encourages students and faculty …
Evangelism And Western Education In Western Kenya: Church Of God (Anderson, Indiana), 1905-1949., Dorothy Ann Smith-Akubue
Evangelism And Western Education In Western Kenya: Church Of God (Anderson, Indiana), 1905-1949., Dorothy Ann Smith-Akubue
Graduate Theses, Dissertations, and Problem Reports (ETD)
This is a study of the impact of the evangelistic approach to western education by the Church of God Mission of Anderson, Indiana, U.S.A. on the Luyia of Western Kenya. It describes the types of schools initiated, their strengths and weaknesses, as a result of this missionary endeavor. The focus of this study also reveals new insights as to the social, religious and political impact of mid-western evangelism and education on the Luyia. Through the use of extensive oral interviews and questionnaires from Western Kenya, this study is able to provide a unique African voice in the assessment of the …
First Year Experiences Of Female College Students: A Qualitative Investigation., James M. Sottile
First Year Experiences Of Female College Students: A Qualitative Investigation., James M. Sottile
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this research was to describe and better understand the transition experiences of first-year women (18 years old) attending a land grant university in a Mid-Atlantic state. Transition was defined as the period of time from the participant's first-semester arrival on campus to the end of that first-semester. The main research question was: What do women experience during their first year (transition period) of college? From this main research question stemmed three sub-questions: (1) What is the nature of the social transition? (2) What is the nature of the educational transition as related to student development? and (3) …
Design Criteria For Tensioned Point-Anchored Resin-Assisted Roof Bolt Systems., John Charles Stankus
Design Criteria For Tensioned Point-Anchored Resin-Assisted Roof Bolt Systems., John Charles Stankus
Graduate Theses, Dissertations, and Problem Reports (ETD)
Roof bolting is now the primary means of roof support in mines. Further, the beam building mechanism is now believed to be the primary mechanism by which roof bolts work. This statement particularly holds true for laminated roof strata. With beam building, the roof strata is reinforced by the installed tension of the roof bolt to a point where it will resist the effects of both vertical and horizontal stresses. Despite all the advances that have been made in the area of roof control, no precise criteria has been formulated to determine what combination of bolt length and tension is …
Anger Expression And Its Relation To Coronary Heart Disease., Sonia Suchday
Anger Expression And Its Relation To Coronary Heart Disease., Sonia Suchday
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to determine if subjects' preferred modes of anger expression were related to their behavioral, cognitive, affective, and physiological responses to interpersonal conflict. Subjects identified as being anger-in or anger-out based on responses to the Spielberger Anger Expression Scales were asked to participate in two conflict oriented role plays, one in which they were instructed to express their anger and and the other in which they were asked to suppress their anger. Results showed that for all subjects anger expression was associated with increased frequency of negative verbal behaviors, greater experience of affect as determined …
Fire Fighters: A Test Of Holland's Theory Of Careers., Brian M. Hershey
Fire Fighters: A Test Of Holland's Theory Of Careers., Brian M. Hershey
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to investigate career and volunteer fire fighters using the vocational concepts of John Holland. The sample consisted of 100 career fire fighters and 100 volunteer fire fighters from a four state region. The instruments that were used in this study were the Vocational Preference Inventory (VPI), the Minnesota Satisfaction Questionnaire (MSQ), and a Demographic Information Form (DIF). The VPI was used to assess the three-letter Holland codes for the subjects; the MSQ was used to assess job satisfaction; the DIF was used to obtain demographic information, self-perceived competence, occupational daydream, career satisfaction, and for …