Thiessen, Kerwin Dale.
Project Thesis (D. Min.)--Denver Conservative Baptist Seminary, 1987. / This is an electronic reproduction of TREN, #090-0159. Includes bibliographical references (leaves 239-248).
Somatic and cognitive stress management techniques their effect on measures of stress and competency in managers : a thesis submitted to Auckland University of Technology in fulfilment of the requirements for the degree of Doctor of Philosophy (PhD), 2007 / Mark Le Fevre.Le Fevre, Mark January 2007 (has links)
Thesis (PhD) -- AUT University, 2007. / Includes bibliographical references. Also held in print (xiv, 276 leaves ; 30 cm.) in Akoranga Campus Theses Collection (T 158.72 LEF)
The impact of stress on productivity of employees at the Education Training and Development practices Sector Education and Training Authority /Menze, Menyezwa Nozizwe Mandu. January 2006 (has links)
Thesis (MA(Social Work Management))--University of Pretoria, 2006. / Includes bibliographical references. Mode of access :World Wide Web.
Vogel, Fergus Ruric.
Thesis (Ph.D.(Psychology))-University of Pretoria, 2006. / Abstract in English and Afrikaans. Includes bibliographical references. Available on the internet via the World Wide Web.
Archer, Gregory Scott
01 November 2005
Feeding the extract of the seaweed Ascophyllum nodosum (ANOD) has been shown to mediate the response of livestock to certain environmental stressors. To determine if feeding ANOD is useful in alleviating handling and transport stress, two trials were conducted. The dose response trial was conducted to determine at which rate ANOD should be fed to obtain beneficial results. Forty-four lambs received ANOD at either 0 (control), 0.5, 1, or 2% of dry matter intake per day (approximately 0, 0.25, 0.5, and 1 g/kg of body wt per day). Sheep were administered ANOD twice daily for 14d. After 14d of supplementation, IgG and IgM antibody response to ovalbumin was reduced by ANOD. The sheep fed at the 2% rate had a narrower range of body temperature during transport than controls. The 2% rate also had lower body temperatures than the controls during times when the thermal heat index was above 80. The sheep fed the 2% rate had lower cortisol and aldosterone concentrations during walking and transport compared to the controls. Post transport, sheep supplemented at the 1 or 2% rates were less dehydrated as indicated by plasma chemistry profiles andelectrolyte concentrations. In a subsequent trial, the major components of the ANOD (fucoidan, salt, and betaine) were fed to determine which, if any, were responsible for the treatment effects in the dose response trial. After 14d supplementation, the salt and ANOD sheep had a depressed IgG and IgM antibody response to ovalbumin and an increase in white blood cell counts and lymphocyte numbers compared to controls. The ANOD sheep were generally lower in body temperature than the other treatments during transport. The ANOD and salt sheep had lower cortisol concentrations compared to controls. At the end of transport, sheep supplemented with ANOD or salt had lower electrolyte concentrations than control sheep. Supplementation with ANOD was associated with lowered body temperature; however, it also suppressed antibody titer which could leave animals susceptible to bacterial infection. The lowered antibody production is of concern and needs further study before ANOD can be recommended as a useful stress management tool.
Stress response effects on growth, carcass characteristics, and tenderness in Bonsmara-influenced steersFalkenberg, Shollie Marie 16 August 2006 (has links)
Half-blood Bonsmara steers were evaluated for temperament during stressful situations to discover the relationships between behavioral stress responses, growth, carcass characteristics and tenderness. Two experiments were conducted to evaluate behavioral stress responses at different stages in the U.S. beef production system with growth, carcass characteristics and tenderness. The first experiment evaluated stress responses at both time of weaning and at the beginning of the feedlot period on half-blood Bonsmara X Beefmaster steers. Steers (n=156) were weaned and paired to destinations of either Uvalde or Overton for winter grazing. At weaning cattle were weighed, and temperament measurements were recorded. After grazing winter pastures, cattle entered the feedlot and were measured for temperament, weight, and condition and frame scores. Cattle were harvested in two groups; each group was selected for harvest when they reached a backfat of approximately 7 mm. Backfat endpoints were determined by visual assessment and ultrasound. Carcass data were recorded approximately 36 hrs post-mortem, and 2.5cm steaks were removed from the 13th rib for Warner-Bratzler shear force determination. The second experiment involved Bonsmara X Angus (n=207) steers grazed on wheat pasture and fed at Cattletown feedlot near Hereford, TX. The steers were evaluated near the beginning and end of the finishing phase for performance and temperament. They were harvested in two groups; each group was selected for harvest when they reached approximately 7 mm of backfat as determined by visual assessment and ultrasound. In experiments 1 and 2, behavioral or temperament measures and hormonal responses were related to each other. It appeared as cattle become acclimated to the production system, temperament measures lose their predictive ability. In Experiment 1, weaning exit velocity appeared to be more related to economically important traits such as ADG (r = -0.26), ribeye area (r = -0.37), and Warner Bratzler shear force (r = 0.27), although beginning feedlot exit velocity was associated with feedlot weights (r = -0.30). In Experiment 2, end feedlot measurements tended to be more associated with feedlot weight (r = -0.20), but there did not seem to be any high relationships with carcass characteristics and tenderness.
Evaluation of adrenal function, growth, carcass characteristics, blood metabolites, hematological and immune parameters in Angus, Brahman, Bonsmara X Angus and Bonsmara beef steersJacobs Hollenbeck, Regina 30 October 2006 (has links)
Adrenal function, blood metabolites, hematological parameters, growth, and carcass characteristics were compared in tropically-adapted (Brahman,) intermediate (Bonsmara and Bonsmara X Angus crossbred,) and temperate (Angus; n=10 each) beef steers. An adrenal gland challenge was conducted, entailing serial blood collection at 15-min intervals for a 12.5-h period, with administration of exogenous ACTH (0.1 IU/kg BW) 2.5-h into the experiment. Steers were maintained on Coastal bermudagrass pastures overseeded with ryegrass for five month; body weights and blood samples were obtained every 21 days. An anterior pituitary/adrenal gland challenge was conducted, entailing serial blood collection at 120, 90, 60 and 30 min prior to, and 10, 20, 30, 60 and 120 min following administration of exogenous CRH (0.1 ug/kg BW). Physical and physiological signs of heat stress were assessed, and blood samples were obtained for analysis. Exit velocity was measured. Carcass characteristics were determined post-slaughter. Statistical analysis was conducted using ANOVA for repeated measures, using least square means and PearsonÃ¢ÂÂs and SpearmanÃ¢ÂÂs correlation analyses. Bonsmara and Bonsmara X Angus had lower basal cortisol (CS) than Angus and Brahman steers. Angus steers had greater adrenal responsiveness to ACTH, and responded faster to CRH than the other breedtypes. Bonsmara steers were slower in responding to CRH, and returning to basal CS following ACTH or CRH administration. Angus and Bonsmara X Angus grew faster during the finishing phase than Brahman or Bonsmara steers. Angus had higher quality grades than other breedtypes; rib-eye area and hot carcass weight were greater in Angus than Brahman steers, but similar among Angus, Bonsmara X Angus and Bonsmara steers. Angus and Brahman were less docile than Bonsmara and Bonsmara X Angus steers. Angus steers had higher respiration rates and serum concentrations of sodium, lower aldosterone during moderate heat exposure, and lesser serum concentrations of glucose, urea and cholesterol than tropically-influenced breedtypes. Angus had rectal and surface temperatures similar to those of Brahman, but greater than those of Bonsmara X Angus or Bonsmara steers. Intermediate breedtypes like the Bonsmara provide a compromise to producers, allowing them to address the demands of consumers while raising cattle better suited to survival in tropical climates.
19 June 2002
Currently, laser module package is a popular product in optical fiber communication. In the laser module package process smallness is the key point, so dimensions control to influence the oscillation, ageing of material of the laser module operation. This study aim to simulate the laser module weld part's von Mises stress and the laser module weld part's von Mises strain (by using a commercial FEM package, ANSYS) in different temperature cyclic, From the finding of the study, different material property and geometry contour affect the laser module¡¦s ability and cyclic lifespan. For instance Thermal shock will influence the von Mises stress, and thermal cyclic influences viscoplastic strain range and use life. In addation, creep, ageing and stress relaxation happen easily in the high temperature. When the temperature fixes at cyclic period, changing dwell time affects more than changing ramp time. Furthermore, the effects of the study of solder¡¦s geometry contour and the solder¡¦s material property, the behavior of thermal, their advantage and their disadvantageously are also compared in this report. The future, the results obtained by the analytical model will refer to interrelated research.
12 February 2009
A finite element is formulated to analyze the deflection and stresses of circular and annular piezoelectric plates underloading of applied electrical potential. The element is based on linear piezoelasticity with displacement field and electrical potential properly assumed. To obtain more accurate nodal stresses , stress recovery is applied which derive nodal stresses from the theoretically accurate stresses at Gaussin points by the least square method. Typical example in the literature are solved by the present method , comparisons are made with those by other methods and experiments to test the validity and accuracy of the present method.
Lee, Lisa, 1977-
25 October 2007
Research has consistently shown an association between the personality trait of perfectionism and a variety of emotional, psychological, and interpersonal difficulties. Using a longitudinal design, the present investigation aimed to examine the validity of a diathesis-stress model linking perfectionism to specific psychopathological symptoms in a large sample of university students. The specific stress processes of stress enhancement and stress generation were examined as potential mechanisms linking perfectionism with emotional maladjustment (see Hewitt & Flett, 2002). In addition, two different frameworks for conceptualizing perfectionism were tested: (1) a multidimensional framework by Hewitt and Flett (1991) which posits that perfectionistic tendencies and behaviours are influenced both by intrapersonal and interpersonal factors, and (2) a adaptive-maladaptive perfectionism typology (Frost et al., 1993) which posits the existence of both a positive and a negative form of perfectionism. Results of this investigation indicated that particular dimensions of perfectionism were directly predictive of stress enhancement. In addition, particular dimensions of perfectionism were also predictive of stress generation, albeit indirectly via the experience of general negative affect. Finally, perfectionism was indeed predictive of increases in emotional maladjustment over time. More specifically, particular perfectionism dimensions were directly predictive of psychopathological symptoms, while other dimensions were only predictive of symptoms via their interactions with relevant measures of life stress (i.e., via a diathesis-stress interaction). The results of the present investigation do not support the adaptive-maladaptive perfectionism typology in that the measure of adaptive perfectionism used was predictive of both stress and psychopathological symptoms. The results of this study are more consistent with the perfectionism framework highlighting intrapersonal-interpersonal dimensions. Overall, the results of this study suggest that a diathesis-stress model provides a fruitful framework from which to investigate perfectionism and its relation to psychopathology. / Thesis (Ph.D, Psychology) -- Queen's University, 2007-10-10 20:09:19.604
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