Digital Commons Network^™

A Study Of The Perceptions Of New And Veteran Elementary School Teachers Regarding Stress Factors That Impact Their Careers., Kristi Lynn Christopher

Electronic Theses and Dissertations

The goal of this study was to identify some of the key stressors novice and veteran teachers face and to determine if there are any particular steps that administrators of the school systems can take to ensure the success of all teachers. The qualitative research method was used in this study. An interview guide was developed and used during the interview process. Eighteen teachers, nine new teachers and nine veteran teachers all with general education classroom experience participated in the research. The interviews were taped and transcribed verbatim, and then analyzed to develop themes.

Themes emerged regarding issues that teachers …

The Relationship Of Stress Levels To Wellness Practices Among Community College Presidents., Eva Charlotte Ratliff Dawson

Electronic Theses and Dissertations

The purpose of this study was to investigate the variety and level of wellness practices of community college presidents and the relationship of these practices to the stress levels of this group. Additionally, relaxation activities and the feelings, characteristics, and symptoms associated with stress were considered. Items measuring each of these variables, isolated from the literature and tested in a pilot sample, were combined into an electronic instrument, Stress Levels and Wellness Practices Measurement for Community College Presidents.

The design of the study was ex post facto/correlational. The population of the study was American community college presidents. A stratified …

Metallurgical Characterization And Residual Stress Measurements Of Target Structural Materials, Vikram Marthandam

UNLV Retrospective Theses & Dissertations

This investigation is focused on the evaluation of residual stresses in target structural materials due to plastic deformation and welding by using both destructive ring-core (RC) method and nondestructive techniques including positron annihilation spectroscopy (PAS), neutron diffraction (ND) and x-ray diffraction (XRD) methods. Materials tested were austenitic Type 304L SS and martensitic Alloys EP-823 and HT-9. Types of specimen tested include cold-worked (CW), three-point-bent and welded specimens consisting of similar and dissimilar materials. The CW specimens showed increased residual stresses with an increase in cold reduction level. Measurements made on the welded specimens revealed higher residual stresses close to the …

Residual Stress Measurements And Analysis By Destructive And Non-Destructive Techniques, Satish Babu Dronavalli

UNLV Retrospective Theses & Dissertations

This investigation is focused on the evaluation of residual stresses resulting from cold deformation and welding in candidate target structural materials such as martensitic Alloys EP-823 and HT-9, and austenitic Type 304L stainless steel (SS). Measurements of residual stresses were performed by both destructive and nondestructive techniques including ring-core (RC), neutron diffraction (ND) and positron annihilation spectroscopy (PAS). The results obtained by the PAS method indicate that the residual stresses in the cold-worked specimens were significantly enhanced with increased level of cold reduction. Residual stress measurements by the RC method on welded specimens consisting of similar materials revealed tensile stresses …

Lower Limb Bone Shape And Structure Among Populations Of Differing Lifestyles: Effects Of Biomechanical Stress And Inferences Of Activity, Michele Marcela Bleuze

UNLV Retrospective Theses & Dissertations

It is known that activity-related stresses and mechanical loadings affect adult bone morphology. The purpose of this study is to examine how well presumed subsistence-related activities correlate with bone morphology; In addition, this study will investigate the degree to which sex differences can be explained by differences in mechanical loaDing If such differences in expression are apparent between males and females within a population, then it can be speculated that the sexes were participating in different activities---or at least in activities that yielded different mechanical loadings; Although there have been several biomechanical studies that have looked at the relationship between …

Stress Corrosion Cracking And Hydrogen Embrittlement Of Martensitic Alloy Ep -823, Mohammad Kamal Hossain

UNLV Retrospective Theses & Dissertations

This investigation is focused on the evaluation of stress corrosion cracking (SCC), localized corrosion, and hydrogen embrittlement (HE) susceptibility of martensitic Alloy EP-823 in neutral and acidic solutions at ambient and elevated temperatures. While no failures were observed in smooth specimens in the neutral solution, failures were noticed in the 90°C acidic solution at constant-load (CL) leading to a threshold stress (sigmath) of 102 ksi. The presence of a notch reduced the sigmath value to 91 ksi in a similar environment. The ductility (%El and %RA), time-to-failure (TTF), and true failure stress (sigmaf) were gradually reduced in both environments with …

Analysis Of Demographic Variables And Levels Of Stress In Law Enforcement Officers, Kathleen M. Jansen

PCOM Psychology Dissertations

Employment in a law enforcement profession exposes an individual to potential stressors not experienced in most other professions. Sporadic efforts have been made to design stress management programs to assist officers in coping with the demands of their jobs. Much of the previous research on law enforcement stress has focused on examining the effectiveness of various coping skills; however, the training has focused on teaching a healthy lifestyle. This study seeks to add to the existing research by examining what elements of the job are perceived as the most stressful and what demographic variables, if any, may influence an individual's …

Effects Of Voluntary Control On Performance Response Under Stress., Christina Shawn Morris

Electronic Theses and Dissertations

Recent stressful environments within military and non-military domains are producing a new challenge for the lab-based study of stress on task performance, one that requires knowledge of underlying cognitive-motivational and goal orientation factors. Results of recent stress on task performance research traditionally employ metaphorical explanations (i.e., resource theory) in order to rapidly apply stimulus-response outcomes to the real world counterparts. This dissertation provides an alternative perspective about these metaphorical, or black box, interpretations and reveals how they may be confounded with respect to the intended real world counterpart. To examine how voluntary human control can influence traditional stress/no-stress research findings, …

Stress In The American Workplace, Stacey H. Mckenzie

Seton Hall University Dissertations and Theses (ETDs)

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Finite Element Analysis Of A Test Specimen For Strength Of A Co-Polymer Layer At A Bone-Implant Interface, Nitin Chhabra

Electronic Theses and Dissertations

The aim of this work is to evaluate the mechanical strength of a co-polymer of 2-hydroxyethylmethacrylate (HEMA) and methylmethacrylate (MMA), so that it can be applied as an interfacial layer between bone cement and steel implants to improve their performance and life. Finite element (FE) analysis techniques are used to assess the behavior of the interface layer under static and dynamic loading conditions. The material property of the co-polymer is a function of its composition and water saturation. The factors affecting the strength of the bone-implant interface are many. Implant interfacial fracture can lead to decreased stability. Fatigue life is …

Gender And Ethnic Differences In Perceived Stress As A Predictor Of Smoking Behaviors In Rural Adolescents, Lashanda R. Jones

Theses and Dissertations

Cross-sectional and longitudinal analyses were conducted to examine the impact of perceived stress on current and future smoking behaviors of rural Virginia middle school students. Data were analyzed for 685 sixth grade students and 554 seventh grade students. Sixth grade students were 52% male, 53% Caucasian American (CA), and 47% African American (AA). For 7th graders, the sample was 53% female and 56% CA (44% AA). Of the 685 sixth grade students, 7% reported that they had smoked cigarettes at least once during the past 30 days (n=46,63% male and 67% CA). By the 7th grade, the percentage of smokers …

School Schedules And How They Impact Student Perceptions Of Stress, David C. Flocco

Seton Hall University Dissertations and Theses (ETDs)

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Psychological And Neuropsychological Correlates Of Postconcussional Disorder, Joy Helena Wymer

LSU Doctoral Dissertations

Chronic symptoms of Postconcussional Disorder (PCD) occur in a significant minority of mild brain injury patients. The latest research suggests an interactionistic perspective as the most logical and empirically supported pathogenesis for the development and maintenance of PCD. The interactionistic perspective implicates organic factors in the development of acute symptoms of PCD, and psychological factors in the maintenance of chronic symptoms. Possible psychological factors relevant in the maintenance of PCD symptoms include a grief response, a coping hypothesis, and the development of dysfunctional coping loops. Providing support for a psychological etiology of symptom maintenance is research indicating reduction of chronic …

The Effects Of Auditory Distraction On Attention Performance In Asymptomatic College Students With A History Of Mild Head Injury, John H.,Ii Denning

LSU Doctoral Dissertations

Introduction: The majority of individuals experiencing a mild head injury (MHI) recover fully experiencing few residual symptoms. Some individuals who fully recover have shown evidence of residual, albeit subtle, brain functioning disturbances on tasks requiring high levels of cognitive effort. Also, memory complaints in MHI patients may be related to these subtle difficulties when cognitive resources are overwhelmed. This study assessed a group of asymptomatic college students with a history of MHI to determine if there were any residual attention difficulties as well as increased memory complaints. Method: One-hundred twelve college students with and without a history of MHI were …