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You searched for subject:(Heat Stress Characteristics). Showing records 1 – 3 of 3 total matches.

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University of Georgia

1. Cooper, Earl Robert. Monitoring environmental conditions at five southeastern universities.

Degree: 2014, University of Georgia

Athletic trainers must consider environmental conditions when making decisions concerning football practices. Those working in southern settings are faced with stressful environmental conditions often associated with the late summer and early fall. Strategies to minimize heat stress include proper acclimatization, hydration, conditioning, heat illness recognition, and weather monitoring. The purpose of this study was to evaluate the rate of exertional heat illness (EHI) in athletes during a three month period (August-October) at five southeastern universities. The Heat Stroke Checker (KEM Kyoto Electronics Manufacturing Ltd; Japan) was used to measure environmental conditions three times a day at each location. The American College of Sports Medicine (ACSM) and Department of Defense (DOD) Wet Bulb Globe Temperature (WBGT) Heat Stress Index Charts were used to identify the levels of heat illness risk. Heat cramps, heat syncope, heat exhaustion, heat stroke, and hyponatremia were evaluated based on the NATA Exertional Heat Illness position statement. A reportable injury was any athlete who incurred a heat related illness evaluated by the medical staff. A total of 139 heat-illnesses were reported with an EHI rate of 4.19/1000 athlete-exposures (AE) during the three-month period. No cases of heat stroke or hyponatremia were reported. Evaluating each month individually, the greatest number of EHI’s occurred during August (88%) with an EHI rate of 8.95/1000 AE. During August, the EHI rate was 6.31/1000 AE for heat cramps, 2.06/1000 AE for heat exhaustion and 0.58/1000 AE for heat syncope. Pearson correlations between the ACSM and DOD Heat Stress Index Charts and specific heat illnesses were not statistically significant relationships (p>.05). In our study we found a higher heat exhaustion injury rate compared to the NCAA surveillance data possibly due to differences in EHI definitions and reporting mechanisms. The incidence of heat illness in the months of September and October decreased dramatically, suggesting football athletes are at greatest risk of heat illness during August. Our data suggests that during the late summer, previously reported guidelines may overstate the risk of heat illness in highly trained football athletes practicing with the southeastern United States. The development of regionally specific heat index guidelines is recommended.

Subjects/Keywords: Environmental Exposure; Environmental Heat Stress; Exertional Heat Illness; Heat Injuries; Heat Stress; Heat Stress Characteristics; Heat Stress Index; WBGT; WBGT Risk Index

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cooper, E. R. (2014). Monitoring environmental conditions at five southeastern universities. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/21792

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Cooper, Earl Robert. “Monitoring environmental conditions at five southeastern universities.” 2014. Thesis, University of Georgia. Accessed April 10, 2021. http://hdl.handle.net/10724/21792.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Cooper, Earl Robert. “Monitoring environmental conditions at five southeastern universities.” 2014. Web. 10 Apr 2021.

Vancouver:

Cooper ER. Monitoring environmental conditions at five southeastern universities. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/10724/21792.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cooper ER. Monitoring environmental conditions at five southeastern universities. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/21792

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Bellagi, Rahma. Etude de l'adaptation de la race Tarentaise aux conditions du stress thermique en Tunisie : Study of the adaptation of Tarentaise breed to heat stress, in particular during summer climatic conditions of Tunisia.

Degree: Docteur es, Nutrition et Sciences des Aliments, 2017, Université Clermont Auvergne‎ (2017-2020); Université de Carthage (Tunisie)

La race bovine Tarentaise, originaire des Alpes françaises, est une race mixte rustique de nouveau présente en Tunisie depuis les années 1990. Cette thèse avait pour objectif d’étudier l’adaptation de cette race au stress thermique, dans les conditions climatiques estivales du pays.Un premier dispositif devait permettre de quantifier l’effet du stress thermique sur les performances de production laitière (PL) de la race, en comparaison avec la race Holstein (à partir d’une base de données de 16 400 contrôles laitiers individuels issus de 21 exploitations du nord de la Tunisie) et de définir des relations entre la baisse de la PL estivale et certaines caractéristiques des bâtiments d’élevage (à partir d’une enquête menée dans 19 des 21 exploitations). Lorsque l’index température-humidité (THI) est passé d’une valeur moyenne de 53,7 l’hiver à 75,4 l’été, la PL des vaches Holstein et Tarentaise ont baissé respectivement de 0,93 et 0,15 kg/j. Les taux butyreux, protéique et d’urée dans le lait ont chuté de manière identique pour les deux races, alors que le comptage des cellules somatiques a augmenté pour les vaches Holstein (+352 000 /mL) et légèrement baissé pour les Tarentaise (-160 000 /mL). L’enquête a montré que les bâtiments fermés et les toitures métalliques amplifient l’impact du stress thermique et induisent une baisse de PL plus prononcée que les bâtiments ouverts (-1,13 vs -0,27 kg/j) et les autres types de toitures (-1,04 vs -0,15 kg/j).Un second dispositif expérimental, mis en place en ferme, devait permettre de quantifier les effets du stress thermique estival sur certains paramètres physiologiques des vaches Tarentaise, ainsi que la variation de PL quand ce stress est associé à une amélioration nutritionnelle de la ration estivale. Lorsque le THI est passé de 52,9 l’hiver à 77,4 l’été, comme attendu, les fréquences respiratoire et cardiaque, la température rectale et la teneur en cortisol du lait des vaches ont été plus élevées, mais avec une amplitude moins forte que lors d’essais réalisés avec des vaches Holstein. Par contre, la formule sanguine leucocytaire n’a pas été modifiée. Parallèlement, la distribution d’une ration estivale plus concentrée en énergie et protéines a permis de maintenir le niveau d’ingestion des vaches, un bilan énergétique toujours positif et même d’augmenter leur PL de 7,1 kg/j par rapport à la période hivernale.Les résultats obtenus dans cette thèse montrent que la race Tarentaise s’avère être bien adaptée aux conditions climatiques estivales de la Tunisie. De plus, il est possible de pallier les effets négatifs du stress thermique sur les performances de production laitière par une ration estivale mieux équilibrée et par une meilleure conception des bâtiments d’élevage.

In Tunisia, the Tarentaise cow, a dual-purpose rustic breed was imported from the northern region of the French Alps. The aim of this PhD work was to study the adaptation of Tarentaise breed to heat stress, in particular during summer climatic conditions of Tunisia.To achieve our goals, two different studies…

Advisors/Committee Members: Martin, Bruno Jean-Claude (thesis director), Najar, Taha (thesis director).

Subjects/Keywords: Vache laitière; Race Tarentaise; Stress thermique; Adaptabilité; Bâtiments d’élevage; Dairy cow; Tarentaise breed; Heat stress; Adaptability; Barn characteristics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bellagi, R. (2017). Etude de l'adaptation de la race Tarentaise aux conditions du stress thermique en Tunisie : Study of the adaptation of Tarentaise breed to heat stress, in particular during summer climatic conditions of Tunisia. (Doctoral Dissertation). Université Clermont Auvergne‎ (2017-2020); Université de Carthage (Tunisie). Retrieved from http://www.theses.fr/2017CLFAC026

Chicago Manual of Style (16th Edition):

Bellagi, Rahma. “Etude de l'adaptation de la race Tarentaise aux conditions du stress thermique en Tunisie : Study of the adaptation of Tarentaise breed to heat stress, in particular during summer climatic conditions of Tunisia.” 2017. Doctoral Dissertation, Université Clermont Auvergne‎ (2017-2020); Université de Carthage (Tunisie). Accessed April 10, 2021. http://www.theses.fr/2017CLFAC026.

MLA Handbook (7th Edition):

Bellagi, Rahma. “Etude de l'adaptation de la race Tarentaise aux conditions du stress thermique en Tunisie : Study of the adaptation of Tarentaise breed to heat stress, in particular during summer climatic conditions of Tunisia.” 2017. Web. 10 Apr 2021.

Vancouver:

Bellagi R. Etude de l'adaptation de la race Tarentaise aux conditions du stress thermique en Tunisie : Study of the adaptation of Tarentaise breed to heat stress, in particular during summer climatic conditions of Tunisia. [Internet] [Doctoral dissertation]. Université Clermont Auvergne‎ (2017-2020); Université de Carthage (Tunisie); 2017. [cited 2021 Apr 10]. Available from: http://www.theses.fr/2017CLFAC026.

Council of Science Editors:

Bellagi R. Etude de l'adaptation de la race Tarentaise aux conditions du stress thermique en Tunisie : Study of the adaptation of Tarentaise breed to heat stress, in particular during summer climatic conditions of Tunisia. [Doctoral Dissertation]. Université Clermont Auvergne‎ (2017-2020); Université de Carthage (Tunisie); 2017. Available from: http://www.theses.fr/2017CLFAC026

3. Amodeo, Catherine M. Mechanical Behavior of Gas Metal Arc Welds and Lithium-Ion Battery Modules.

Degree: PhD, Mechanical Engineering, 2015, University of Michigan

The first part of the dissertation is related to a study of the failure mechanisms of gas metal arc welds. Cost savings can be gained by minimizing the weld length. However, improperly sized welds can result in the loss of structural integrity of the welded components. The necking/shear failure modes for the mid-sections of gas metal arc welds in lap-shear specimens of HSLA steel are investigated. Three-dimensional finite element models were developed with the geometric characteristics of the heat affected zones (HAZ) designed to match the micrographs of the cross sections for the welds. The distributions of the void volume fraction near the welds shown from the finite element analyses are consistent with the failure modes observed in the experiments. Further finite element analyses showed that the geometric characteristics of the HAZ are key factors for the resulting failure location. The mode I and mode II stress intensity factor (SIF) solutions for gas metal arc welds in lap-shear specimens are investigated by the analytical solutions and by finite element analyses. The computational results indicate that the SIF solutions for realistic welds are lower than the analytical solutions for idealized weld geometry. Further finite element analyses were carried out in order to obtain the computational SIF solutions for the realistic weld geometries with dissimilar sheet thicknesses. Finally, three-dimensional computational results indicate that the distributions of the SIF solutions for discontinuous welds are different from those for continuous welds. In the second part, a computational model is developed for simulations of representative volume element specimens of lithium-ion battery modules under in-plane constrained compression tests. The model allows for computational efficiency while simulating the overall mechanical response of battery modules and the deformation patterns of the heat dissipater. The model is based on the properties of the heat dissipater, the foam, and the macro behavior of the cell components. The computational results compare fairly well with the experimental results. Further finite element analyses showed the increase in the initial nominal buckling stress under dynamic loading conditions. Advisors/Committee Members: Pan, Jwo (committee member), McCormick, Jason Paul (committee member), Lu, Wei (committee member), Kannatey-Asibu Jr., Elijah (committee member).

Subjects/Keywords: Failure modes of gas metal arc welds in single lap-shear specimens; Effect of the geometric characteristics of the heat affected zone; Stress intensity factor solutions for gas metal arc welds in single lap-shear specimens; Stress intensity factor distribution for gas metal arc welds in single lap-shear specimens; Computational models of lithium-ion battery modules under in-plane constrained compression; Mechanical Engineering; Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Amodeo, C. M. (2015). Mechanical Behavior of Gas Metal Arc Welds and Lithium-Ion Battery Modules. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/111520

Chicago Manual of Style (16th Edition):

Amodeo, Catherine M. “Mechanical Behavior of Gas Metal Arc Welds and Lithium-Ion Battery Modules.” 2015. Doctoral Dissertation, University of Michigan. Accessed April 10, 2021. http://hdl.handle.net/2027.42/111520.

MLA Handbook (7th Edition):

Amodeo, Catherine M. “Mechanical Behavior of Gas Metal Arc Welds and Lithium-Ion Battery Modules.” 2015. Web. 10 Apr 2021.

Vancouver:

Amodeo CM. Mechanical Behavior of Gas Metal Arc Welds and Lithium-Ion Battery Modules. [Internet] [Doctoral dissertation]. University of Michigan; 2015. [cited 2021 Apr 10]. Available from: http://hdl.handle.net/2027.42/111520.

Council of Science Editors:

Amodeo CM. Mechanical Behavior of Gas Metal Arc Welds and Lithium-Ion Battery Modules. [Doctoral Dissertation]. University of Michigan; 2015. Available from: http://hdl.handle.net/2027.42/111520

.