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Simulation Of Optimal Drive Systems Consisting Of Gear-Cam Mechanisms With Brushless Dc Servomotors, Norbert Fritz

Dissertations and Theses @ UNI

This study presents the development of flexible tools for the numerical simulation of processing machine drives that consist of servomotors, mechanisms, and machine tools. The simulation allows predicting the motions or vibrations of linkages, forces and torques in joints, motor currents, and system response times as well as evaluating stability and characteristic frequencies of the drive system The simulation tools were implemented as macro components in macro component libraries using the EASY5* Dynamic System Modeling, Simulation, and Analysis software by the Boeing Company. Application of the developed macro components allows fast and efficient modeling of a variety of different drive …

Dimensions Of Roles, Responsibilities, Training Background And Needs, Policies, And Procedures For Paraeducators Dealing With Students With Special Needs, Beverly Anne Plagge

Dissertations and Theses @ UNI

The problem of this research study was to delineate and synthesize the roles, responsibilities, skill level, and training background and needs of paraeducators working with students with special needs from a state that requires paraeducator certification and a state that does not require paraeducator certification. The five core areas of roles and responsibilities were: (a) instructional support, (b) behavior management, (c) diagnostic support, (d) classroom organization, and (e) personal care assistance from the special education paraeducator and the special education teacher who teams with the paraeducator. Very few differences existed between what paraeducators and their teachers felt were appropriate and …

Perceptions Of Iowa High School Principals On The Relationship Of Leadership, School Size, And Socioeconomic Level To School Culture, Kevin Wayne Fiene

Dissertations and Theses @ UNI

American society is changing. Consequently, public schools are being called to change as well. Previous reform efforts have failed to bring about substantive change and improvement. Current reform efforts are calling for the changing of school culture. What factors influence school culture? What role does leadership, school size, and socioeconomic levels play in developing school culture?

The purpose of this study was to investigate the relationship of leadership, school size, and socioeconomic level to school culture utilizing the Competing Values Framework. The Competing Values Framework provided four ideal culture types and eight leadership roles. Culture types included group, developmental, rational …

Investigation Of The Glucose-Induced Inactivation Of Maltose Permease In Saccharomyces, Igor L. Medintz

Dissertations, Theses, and Capstone Projects

The addition of glucose to maltose fermenting Saccharomyces cerevisiae cells results in the rapid loss of maltose transport activity. This results both from the repression of the maltose permease gene transcription and from the post-translational inactivation of maltose permease through a process termed glucose-induced inactivation of maltose permease. The inactivation consists of two separable processes, a rapid inhibition of maltose transport activity and by a slower degradation of maltose permease protein. Degradation is dependent on endocytosis, vesicular sorting and vacuolar proteolysis, and is independent of the proteasome. Furthermore, maltose permease exists in differentially phosphorylated forms.

Ubiquitin and the ubiquitin-conjugating system …

Gender, Religion, Causal Attributions, And Correctional Orientations Among Juvenile Justice Personnel, Amy Lynn Lyons

Dissertations and Theses @ UNI

The purpose of this quantitative study is to examine the attitudes and orientations of juvenile justice personnel from four urban counties within the state of Iowa. The nonrandom sample used in the present study is secondary and originally collected for a larger study conducted by Leiber (1993). A closed-ended, self-report survey was administered to each respondent. The total sample for the present research is 263. The hypotheses guiding the present study are based on the assumption that women experience religion differently from men, and in turn, will blame society for youth crime and favor orientations supporting diversion.

Carol Gilligan (1982) …

An Evaluation Of Adhd Assessment, Intervention, And Progress Monitoring Practices In One School According To Best Practice Recommendations, Kristin M. Briggs

Dissertations and Theses @ UNI

This study investigated the quality of ADHD assessment, interventions, and progress monitoring practices in a school building. Education personnel were also surveyed (n = 8) to gain further insight into the current school policies and practices for ADHD. Barkley's 1990 model of ADHD assessment and intervention was chosen as the standard of best practice in which current practices were compared. One school was selected for participation in the study. All students on medication for ADHD in kindergarten through twelfth grades served as subjects (n = 13). Data analysis revealed that seven of these student files (54%) did not include documentation …

Psychological Maltreatment : The Case Of Verbal Abuse, Majedah Khalifah

Dissertations and Theses @ UNI

The purpose of the present study was to explore the relationship between parental verbal abuse and children's emotional development (depression, anxiety, stress, self esteem, and anger). The participants were 29 male and 89 female college students whose average age was 19. Five instruments were used to collect data: Depression, Anxiety, and Stress Scales (DASS-21), Coopersmith Self-Esteem Inventory, Verbal Abuse Measure, Child Attitude Toward Parents Measure, and State-Trait Anger Expression Inventory. For data analyses, several tests were used. The Pearson correlation was calculated to see the inter-correlations of each emotional variable. A multiple regression analysis was used to find out what …

Adolescent Depression : Further Examination Of Gender Differences, Elizabeth Marie O'Neill

Dissertations and Theses @ UNI

This study was designed to examine pertinent research questions that remain unanswered by past investigations of adolescent depression. Specifically this study investigated potential differences between high and low scoring depressed adolescents, and whether gender is an influential variable for consideration. Subjects were 175 adolescent boys and girls from a laboratory school in Midwestern Iowa. Subjects were divided into four groups based on gender and responses two questions on the BDI-A. Specifically, the four groups were: boys who scored at or above IO on the BDI-A (sub-clinical group--boys), boys who scored below 10 on the BDI-A (control group--boys), girls who scored …

Physical Activity Patterns Among Physical Education Major Students In Selected Institutions Of China And The United States, Wei Bian

Dissertations and Theses @ UNI

The benefits associated with regular physical activity have been well documented in recent years. Numerous studies have investigated physical activity patterns among children, adolescents, and adults, yet little work to date has examined the patterns of habitual physical activity participation among pre-service physical education (PE) majors. Furthermore, inasmuch as physical activity affords health benefits irrespective of one's nationality or culture, comparisons among the peoples of nations around the world becomes of greater interest.

This study was designed to examine the leisure-time physical activity patterns of physical education major students in selected institutions from the People's Republic of China (PRC) and …

Pre-Performance Routines And Rhythm: A Comparative Study, Blake Wade Miller

Dissertations and Theses @ UNI

The present study was designed to investigate the effects of pre-performance routine rhythm on novel motor task success. At the center of the study was the comparison of differing characteristics of two theories of motor control: the dynamical systems theory and the schema theory. It was hypothesized that an even pre-performance routine rhythm would be more advantageous to task success than an uneven preperformance routine rhythm, regardless of the rhythmic characteristic of the task. The results concluded the contrary to be more accurate, and indicated that task success was more likely to occur when the pre-performance routine rhythm was congruent …

The Case Of Pearl S. Buck: Neglect And Abandonment Vs. Recognition And Recovery, Linda K. Adkins

Dissertations and Theses @ UNI

Pearls. Buck was the third American to win the Nobel Prize for Literature, the first American woman to win this Prize, and only the fourth woman in the world to do so. Taking into consideration the Nobel Prize and all the additional honors and awards Buck and her writing received, it is odd that she has been abandoned by American literary critics. Therefore, it is the goal of this thesis to identify reasons why Pearl Buck and her works have been neglected, and to provide significant reasons why she and her work should be recognized and studied. The first part …

Idols Are For Suckers: An Exhibition Of Prints, Brett Anthony Fisher

Dissertations and Theses @ UNI

In this show I have included some of the prints that I have made during my time as a graduate student at the University of Northern Iowa. I believe that these prints show development and transition in style and sensibility. As I have worked, I have tried to continually develop my art. With every print there is an attempt to go beyond the barriers of the previous one. Working intuitively, I try not to have any preconceived notions of what the final piece is going to look like. Every step in the process is valuable; I don't always necessarily know …

Effects Of Parenting Styles, Self-Esteem, Self-Concept, And Attribution Styles On Children’S Popularity, Michelle Ann Jagodzinski

Dissertations and Theses @ UNI

The purpose of the present study was to examine the link between parent-child and child-peer relationships. This study tests a hypothesized model suggesting that adolescents' self-esteem, self-concept, and attribution styles mediate the association between parenting attitudes and social competence. The sample consisted of 170 students in the 6th through 9th grades (83 males, 87 females) and 113 of their parents (49 males, 64 females). Student questionnaires were administered in a school based setting and consisted of self-report and peer report measures. Students completed questionnaires regarding self-esteem, self-concept, attribution styles, and peer popularity. Parents responded to mailings and completed a self-report …

Exploration Of Namibian Adolescents’ Sexual Knowledge, Attitudes And Behavior, Shamani-Jeffrey Shikwambi

Dissertations and Theses @ UNI

The purpose of this study was to examine the relationship between sexual knowledge, sexual attitude, and sexual behavior among Namibian adolescents.

Data were collected by using a ~edified version of the Prevention Minimum Evaluation Data Set (PMEDS) instrument. The participants were 45 twelfth graders, of which 23 were females and 22 males.

Analysis of the data included an examination of intercorrelation between sexual knowledge, sexual attitude, and sexual behavior, and an investigation of gender differences among these three variables. Pearson correlations were calculated for each variable and t-tests were run to look for the gender difference. Multiple regression was also …

Degradation Of Explosives In Solution Using Bacteria, A Fungus (Phanerochaete Chrysosporium), Titanium Dioxide, Ozone, And Electrochemical Peroxidation, Stéphane Debost

Dissertations and Theses @ UNI

As a result of munitions manufacturing and decommissioning, explosive compounds have contaminated groundwater and soils at many sites throughout the U.S. and worldwide. Three of the most commonly occurring explosive contaminants are TNT, ROX, and HMX. Many processes, biological as well as physical, have been developed to remediate the contaminated material. But feasibility studies rarely take into account the three contaminants at once. We chose four of the technologies used to remediate explosives-contaminated water and studied comparatively their effectiveness and efficiency in degrading TNT, ROX, and HMX in solution at their maximal solubilities. The chosen technologies were bacterial and fungal …

The College Student Worry Questionnaire: Development And Preliminary Psychometric Properties, Gretchen M. Domek

Dissertations and Theses @ UNI

To date, there has not been a well-developed measure designed specifically to evaluate the content of worry. The purpose of this study was to examine the psychometric properties of a worry questionnaire designed to measure the worry content of college students, the College Student Worry Questionnaire (CSWQ). A total of 315 participants were recruited from several undergraduate psychology courses at a large mid-western university. Participants completed a questionnaire packet which consisted of a written informed consent form, a background questionnaire, the CSWQ, the Satisfaction With Life Scale, the Marlowe-Crowne Social Desirability Scale, the Positive and Negative Affect Schedule, the Beck …

Historical Essays On Meteorology, 1919-1995, Theodore S. Feldman

Faculty Publications

No abstract provided.