Rozprawy doktorskie na temat „Effect of stress”
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Eakes, Donald Joseph. "Moisture stress conditioning, potassium nutrition, and tolerance of Salvia splendens 'Bonfire' to moisture stress". Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54350.
Pełny tekst źródłaPh. D.
Cesaretti, Juan Manuel. "Mechanical stress and stress compensation in Hall sensors". Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28202.
Pełny tekst źródłaDölle, Michael. "Field effect transistor based CMOS stress sensors /". Tönning ; Lübeck Marburg : Der Andere Verlag, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016086105&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Pełny tekst źródłaMaliphant, Paula. "The effect of pesticide stress on diatoms". Thesis, University of Hertfordshire, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309720.
Pełny tekst źródłaChung, Samwon. "The effect of internal stress on diffusion". Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1058210791.
Pełny tekst źródłaMACHADO, VERONICA MIQUELIN. "EFFECT OF ELASTIC-PLASTIC STRESS IN THE DEFECT TOLERANCE UNDER STRESS CORROSION CRACKING". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33679@1.
Pełny tekst źródłaCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Corrosão sob tensão (SCC), que consiste na iniciação e propagação de trincas devido ao efeito combinado de tensões mecânicas e o ambiente corrosivo, é um dano potencial para estruturas e componentes. Além do mais, SCC pode ser explicado por diferentes mecanismos dependendo do par material ambiente corrosivo considerado, o que dificulta o uso de um modelo geral para predizer o comportamento de trincas em SCC. Sendo assim, projetos frequentemente utilizam um critério conservativo que desqualifica materiais susceptíveis à SCC sem analisar de maneira apropriada a influência dos campos de tensão que a induzem. O objetivo deste trabalho é avaliar o efeito de tensões elastoplásticas na corrosão sob tensão. Esta abordagem mecânica considera que todos os efeitos corrosivos envolvidos na corrosão sob tensão podem ser apropriadamente quantificados pelas tradicionais resistências do material à iniciação e propagação de trincas para um ambiente corrosivo específico. Corpos de prova de flexão em Alumínio fragilizados por Gálio líquido serão utilizados para prever o efeito de tensões residuais induzidas por deformações plásticas na iniciação de trincas por corrosão sob tensão. Além disso, uma análise quantitativa baseada no comportamento de trincas não propagantes a partir de entalhes será usada para estimar a tensão necessária para iniciar e propagar trincas em corpos de prova entalhados em aço AISI 4140 sujeitos à corrosão por sulfeto de hidrogênio em ambiente aquoso. O comportamento de trincas curtas e a carga máxima suportada pelos corpos de prova entalhados são analisadas considerando campos de tensões lineares elástico e elastoplásticos através do modelo proposto que será validado através de dados experimentais.
Stress Corrosion Cracking (SCC), which consist in the initiation and propagation of cracks due to the combined attack of mechanical stresses and a corrosive environment is a potential danger for structures and components. Moreover, SCC can be explained by different mechanisms depending on the metal environmental pair, what makes difficult to create a generalized analytical approach to predict the crack behavior in SCC. Therefore, projects often use an over-conservative design criteria that disqualify a material susceptible to SCC without properly evaluate the influence of the stress fields that drive them. The aim of this work is to evaluate the effect of elastic-plastic stress in SCC. This mechanical approach assumes that all chemical effects involved in SCC problems can be appositely described and quantified by traditional material resistances to crack initiation and propagation at under specific environment. Aluminum bending specimens in Gallium environment are used to predict the effect of the residual stress induced by plastic deformation in the crack initiation under SCC conditions. Furthermore, a quantitative analysis based on the non-propagating crack behavior departing from notch tips are used to calculate the necessary stress to initiate and propagate SCC in AISI 4140 steel notched specimens under aqueous hydrogen sulfide environment. The non-propagating crack behavior and the maximum load supported by notched specimens are analyzed under linear elastic and elastic-plastic stress field through the proposed model that will be validated by experimental data.
Iyer, Venkatramani S. "Effect of residual stress gradients in austenitic stainless steels on stress corrosion cracking". Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/42119.
Pełny tekst źródłaThe effect of the residual stresses developed during simulated weld heat affected zone in
austenitic stainless steel specimen on the stress corrosion cracking susceptibility was studied.
Residual stresses was measured using X-ray diffraction technique. Boiling Magnesium
Chloride was used as corrosive environment. Compressive stresses developed in the HAZ of
the specimen and in regions away from the HAZ stress free values were obtained. The magnitude
of the stress gradient decreased as the peak temperature attained during simulated
welding decreased. Transgranular cracks were observed in the compressive stress gradient
region and time to cracking decreased with increasing stress gradient. Higher nickel content
alloys took longer to crack as opposed to lower nickel content alloys at approximately the
same stress gradient.
Master of Science
Sorooshzadeh, Ali. "Environmental stress and calcium nutrition during the seed-filling stage of soybean". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0015/NQ44594.pdf.
Pełny tekst źródłaMartin, David E. "The effect of heat stress on excess post exercise oxygen consumption". Virtual Press, 1992. http://liblink.bsu.edu/uhtbin/catkey/834623.
Pełny tekst źródłaSchool of Physical Education
Poirier, Patrick. "Effect of chronic stress on prefrontal cortical function". Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86861.
Pełny tekst źródłaFirst, contrary to previous evidences, chronic stress induces working memory performance alterations differentially in two populations of rats. One group displayed a decrease of performance only at 30 second delay, while the other had a decrease and increase at 0 and 30 seconds respectively.
Then, the effect of chronic stress on synaptic plasticity induction in the hippocampus-PFC network was investigated. High-frequency tetanic stimulation (HFS) of the dorsal hippocampus that induced long-term potentiation (LTP) in the prelimbic and infralimbic cortex in normal conditions was unable to induce LTP after chronic stress in the infralimbic cortex, whereas long-term depression (LTD) instead of LTP was induced in the prelimbic cortex.
Given that synaptic plasticity has been shown to depend on NMDA receptors in the PFC, NMDA subunit expressions before and after chronic stress was examined. There was a decrease of NR1 subunits expression in the prelimbic, but not infralimbic cortex. In contrast, the NR2A/NR2B ratio was increased in the infralimbic, but not prelimbic cortex. These results suggest that chronic stress disrupts PFC functions through dynamic modulation of distinct neural networks within the PFC.
Le cortex préfrontal (PFC) est une région du cerveau qui contrôle les fonctions cognitives comme la mémoire de travail. Dans cette thèse, l'effet du stress chronique sur des fonctions du PFC a été analysé chez des rats adultes.
Premièrement, les performances de la mémoire de travail ont été mesurées avant et après exposition au stress chronique. Nous avons constaté que le stress chronique induit des changements de performances de la mémoire de travail différemment selon deux populations de rats. Une des populations a démontré une diminution de performance seulement à 30 secondes de délai. Au contraire, l'autre a démontré une diminution de performance à 0 seconde et une amélioration de performance à 30 secondes.
En plus, nous avons évalué l'effet du stress chronique sur l'induction de la plasticité synaptique dans le réseau reliant l'hippocampe au PFC. Dans les conditions initiales, une stimulation tétanique à haute fréquence (HFS) dans l'hippocampe dorsal provoquait une potentialisation à long terme (LTP) dans le cortex prélimbique et infralimbique Or après exposition au stress chronique, une stimulation tétanique à haute fréquence n'a pas entraîné de potentialisation à long terme dans le cortex infralimbique. De plus, une exposition au stress chronique a provoqué l'apparition dans le cortex prélimbique d'une dépression à long terme (LTD) plutôt qu'une potentialisation à long terme.
Étant donné que la plasticité synaptique dépend des récepteurs de NMDA dans le PFC, nous avons examiné l'expression de sous-unité de NMDA avant et après exposition au stress chronique. En accord avec les changements synaptiques distincts de plasticité entre le cortex prélimbique et infralimbique après exposition au stress chronique, nous avons observé que l'expression de la sous-unité NR1 a diminué dans le prélimbique, mais non dans l'infralimbique. En revanche, le ratio de NR2A/NR2B a augmenté dans le cortex infralimbique, mais non dans le prélimbique. Ces résultats suggèrent que le stress chronique perturbe les fonctions du PFC par la modulation dynamique des réseaux distincts neurologiques dans le PFC.
Barsoum, Imad. "The effect of stress state in ductile failure". Doctoral thesis, Stockholm : Hållfasthetslära, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4667.
Pełny tekst źródłaBogart, Robert William. "The effect of stress on global cerebral ischemia". Connect to resource, 2008. http://hdl.handle.net/1811/32235.
Pełny tekst źródłaYeh, Lestter. "The Effect of Stress Coping Techniques in Sports". Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/cmc_theses/1240.
Pełny tekst źródłaPicton, S. "The effect of heat-stress on tomato ripening". Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233614.
Pełny tekst źródłaMathers, John F. "The effect of stress on golf putting performance". Thesis, University of Strathclyde, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431793.
Pełny tekst źródłaKumsta, Caroline. "The effect of oxidative stress on C. elegans". kostenfrei, 2008. http://mediatum2.ub.tum.de/doc/678556/678556.pdf.
Pełny tekst źródłaHoskin, Robert. "The effect of psychological stress on auditory perception". Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/6193/.
Pełny tekst źródłaLe, Fevre Ruth Elizabeth. "Phytate and plant stress responses". Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708218.
Pełny tekst źródłaBrattos, Alexandra. "The Effect of Stress Presentation Mode on Stress Acquisition Among Advanced Learners of Russian". BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3140.
Pełny tekst źródłaFollowell, Timothy B. "Effect of Dental Treatment on Parental Stress as Measured by the Parenting Stress Index". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276567183.
Pełny tekst źródłaAlm, David Michael. "Comparison and interaction of heat and salt stress in cultured tobacco cells". Virtual Press, 1986. http://liblink.bsu.edu/uhtbin/catkey/445616.
Pełny tekst źródłaCummins, Robert A. "The effect of organizational structure and demographics on administrative stress". Theological Research Exchange Network (TREN), 1987. http://www.tren.com.
Pełny tekst źródłaKalifa, Ali. "Salt stress, and phosphorus absorption by potato plants cv. 'Russet Burbank'". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29727.pdf.
Pełny tekst źródłaSu, Dan. "Microcrack damage and its effect on stress wave propagation". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 114 p, 2009. http://proquest.umi.com/pqdweb?did=1654487641&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Pełny tekst źródłaHibbert, George. "Hyperventilation in panic : cause or effect?" Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235982.
Pełny tekst źródłaFrance, Christopher R. (Christopher Robert). "Cardiovascular responses to psychological stress and caffeine". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74649.
Pełny tekst źródłaHicks, Trevor. "Standardised stress management training : does it have an effect?" Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/standardised-stress-management-training-does-it-have-an-effect(cddc9014-2eca-4a21-9ac7-d0d44f4ea86f).html.
Pełny tekst źródłaSun, Hong. "The effect of hydrodynamic stress on plant embryo development". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33945.
Pełny tekst źródłaKeeley, Maureen Patricia 1961. "THE EFFECT OF STRESS ON THE DECODER'S COMMUNICATION CHANNELS". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276499.
Pełny tekst źródłaCrowe, P. J. "The effect of diet and stress on substrate metabolism". Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379881.
Pełny tekst źródłaChan, Wan-Kan. "A study of the thermoelastic effect for stress analysis". Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383253.
Pełny tekst źródłaDenison, Tracy Adam. "The effect of fluid shear stress on growth plate". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29603.
Pełny tekst źródłaCommittee Chair: Boyan, Barbara; Committee Co-Chair: Schwartz, Zvi; Committee Member: Bonewald, Lynda; Committee Member: Jo, Hanjoong; Committee Member: Sambanis, Athanassios. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Johnson, Bobbie. "Effect of stress and diapause in two Calliphoridae species". Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4200/.
Pełny tekst źródłaPalanki, Zoltan. "Effect of the applied stress on shape memory alloys". Besançon, 2009. http://www.theses.fr/2009BESA2002.
Pełny tekst źródłaIn this thesis two models will be concerned. The one developed earlier in Debrecen enabled to calculate the non-chemical energy terms at the start and at the end of martensitic transformation. Nevertheless not only theses points are relevant but the knowledge of the dependence of the dissipative and elastic terms on the transformed martensitic fraction in the whole transformation range is important too. Consequently an extension of the model was needed. This new model was used to evaluate the data measured on polycrystalline an single crystalline CuAINi shape memory alloys. The results of the measurements on single crystalline samples could be explained only if two types of martensitic phases were taken into account. Indeed the Besançon model developed for simulation of the martensitic transformation counts with two different martensitic phases too, namely temperature and stress induced ones. After finding the connection between these two models and took them also into account in the Debrecen-model the determination of the input parameters for the simulations became possible and comparison between the measured and calculated hysteresis loops had been made
Hollie, Alfred Henry. "Effect of Hot Spot Policing on Reducing Officer Stress". ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/7390.
Pełny tekst źródłaCrisp, William A. "Combat Posttraumatic Stress Disorder: Effect of Intelligence on Symptomatology". Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4527/.
Pełny tekst źródłaDidriksen, Nancy A. (Nancy Andrews). "The Effect of Examination Stress on Phagocytic Immune Functioning". Thesis, North Texas State University, 1985. https://digital.library.unt.edu/ark:/67531/metadc500983/.
Pełny tekst źródłaKissane, Abby. "The Effect of Oxidative Stress on Myometrial miRNA Expression". Scholarship @ Claremont, 2017. http://scholarship.claremont.edu/scripps_theses/1072.
Pełny tekst źródłaMarckwordt, Michelle. "Effect of Early Traumatic Experience on Current Stress Levels". Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10690957.
Pełny tekst źródłaPast findings regarding the effects of early trauma exposure have been contradictory, showing it to produce both resilience and vulnerability to future stressors. This may be explained by restricted samples, the use of inadequate measures of stress, and/or a failure to consider the possibility of curvilinear relationships. The present study sought to improve on past methodologies, sampling from a community population, utilizing a theory-consistent and well-validated measure of stress, and conducting quadratic regression analyses. Adult participants (N = 255) were recruited from community sites, where they completed the Lifetime Trauma Checklist, the Stress Overload Scale, and a demographic questionnaire. Analyses confirmed a curvilinear relationship between early trauma and stress overload, but not in the expected direction. Both zero- and low-exposure groups had lower levels of current stress overload than the moderate- and high-exposure group, but stress overload scores began to show a decline among the highest in the high-exposure group. The same relationship was found for one of the components of stress overload, personal vulnerability, but not the other, event load. The implications of this differential, possible explanations for the curvilinear result, and the import of these findings for both theory and practice are discussed.
MacCombe, Diane Martha Elizabeth. "The effect of mild acid stress on environmental microorganisms". Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491881.
Pełny tekst źródłaQuinn, Amie L., i University of Lethbridge Faculty of Arts and Science. "The impacts of agricultural chemicals and temperature on the physiological stress response in fish". Thesis, Lethbridge, Alta. : University of Lethbirdge, Faculty of Arts and Science, 2007, 2007. http://hdl.handle.net/10133/676.
Pełny tekst źródłaix, 137 leaves : ill. ; 29 cm.
McDonald-Morken, Colleen Ann. "Hawk and Dove Stress Response Profiles in Humans". Thesis, North Dakota State University, 2011. https://hdl.handle.net/10365/29861.
Pełny tekst źródłaYang, Di. "Cyclic stress effect on stress corrosion cracking of duplex stainless steel in chloride and caustic solutions". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42811.
Pełny tekst źródłaChoudhury, Feroza Kaneez. "Rapid Metabolic Response of Plants Exposed to Light Stress". Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1157543/.
Pełny tekst źródłaMiller, Lana L., i University of Lethbridge Faculty of Arts and Science. "The effects of selenium on the physiological stress response in fish". Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2006, 2006. http://hdl.handle.net/10133/397.
Pełny tekst źródłaxiii, 150 leaves ; 29 cm.
Zhou, Maoqian 1961. "Nitrogen fixation by alfalfa as affected by salt stress and nitrogen levels". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277231.
Pełny tekst źródłaJohnsen, Suzanne Louise 1960. "Early embryos of dams of heat stress". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277034.
Pełny tekst źródłaLeblanc, Rosanne. "Protein synthesis and drought stress in two rapeseed cultivars". Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60487.
Pełny tekst źródłaMa, Wai-lung, i 馬惠龍. "The role of stress tolerance on marine invasive mussels". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/196040.
Pełny tekst źródłapublished_or_final_version
Biological Sciences
Master
Master of Philosophy
Olechowski, Alicia. "THE TIME-DEPENDENT EFFECT OF ACUTE STRESS ON LONG-TERM MEMORY". OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2410.
Pełny tekst źródła