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Статті в журналах з теми "Stress intense":
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Taylor, Marcus K., Heidemarie K. Laurent, Gerald E. Larson, Mitchell J. Rauh, Melissa D. Hiller Lauby, and Douglas A. Granger. "Neurotrophic Response to Intense Military Stress." Medicine & Science in Sports & Exercise 46 (May 2014): 705. http://dx.doi.org/10.1249/01.mss.0000495592.23886.2a.
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Buskila, Yaffa, and Tamar Chen-Levi. "Intense Teaching Schedule in Israeli Teachers." ATHENS JOURNAL OF EDUCATION 8, no. 3 (February 5, 2021): 329–48. http://dx.doi.org/10.30958/aje.8-3-5.
Анотація:
The teaching profession is highly stressful. Stress is a negative phenomenon that develops under conditions of uncontrollable, prolonged and increased pressure. In this study, our goal is (a) to investigate teachers' perception of the sources of stress in school in light of the neoliberal reforms and (b) to compare these sources of stress in primary school, middle school and high school teachers. We hypothesize that the demands and the workload to improve scores in standardized tests, increase the need of teachers to take work home. Therefore, home demands may conflict with school demands. Furthermore, the greatest pressure is on elementary and middle school teachers: Early efforts to improve student achievements in the lower grades would result in better-prepared students in high schools. Data about the sources of stress is based on a previous study of Buskila, Buskila, Giris and Ablin (2019) that investigated the connection between the effects of stress on teachers on somatic syndromes. Three hundred and twenty-one public school teachers working in the Ministry of Education (MOE) in Israel participated in the study. Findings of the mean of the entire samples revealed that the highest level of stress was caused by intense teaching schedule with insufficient breaks. The second cause was related to the composition of the students in the class, and the third was home demands conflicting with school demands. In the middle schools, the highest levels of stress are caused by school principals (M=5.98, SD=3.09) and second is in high school (M=5.00, SD=3.33). The highest level of stress caused by the superintendent is on primary school teachers (M=3.97, SD=3.33) and the second are the middle school teachers (M=3.79, SD = 2.95). The lowest stress level was in high school (M=2.68, SD=2.83). Three significance differences of stress were found among primary, middle, and high schools: The school principal is the highest source of pressure in the middle schools (P=.034), and the superintendent causes the highest level of stress in primary schools (P=.006). The third cause was in high school, related to physical school conditions (p=.002). These results are relevant to teachers, educators, and policy makers involved in planning and managing educational strategies and teachers’ schedules. Identifying and preventing the sources of stress can facilitate better teaching conditions, and a more effective and efficient atmosphere in school. Keywords: Stress at school, teachers' stress, causes of stress in school
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Atzori, Marco, Ricardo Vinuesa, Adrián Lozano-Durán, and Philipp Schlatter. "Intense Reynolds-stress events in turbulent ducts." International Journal of Heat and Fluid Flow 89 (June 2021): 108802. http://dx.doi.org/10.1016/j.ijheatfluidflow.2021.108802.
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Gong, Min, Dongzhu Jiang, Ran Liu, Shuming Tian, Haitao Xing, Zhiduan Chen, Rujie Shi, and Hong-Lei Li. "Influence of High-Temperature and Intense Light on the Enzymatic Antioxidant System in Ginger (Zingiber officinale Roscoe) Plantlets." Metabolites 13, no. 9 (September 4, 2023): 992. http://dx.doi.org/10.3390/metabo13090992.
Анотація:
Environmental stressors such as high temperature and intense light have been shown to have negative effects on plant growth and productivity. To survive in such conditions, plants activate several stress response mechanisms. The synergistic effect of high-temperature and intense light stress has a significant impact on ginger, leading to reduced ginger production. Nevertheless, how ginger responds to this type of stress is not yet fully understood. In this study, we examined the phenotypic changes, malonaldehyde (MDA) content, and the response of four vital enzymes (superoxide dismutase (SOD), catalase (CAT), lipoxygenase (LOX), and nitrate reductase (NR)) in ginger plants subjected to high-temperature and intense light stress. The findings of this study indicate that ginger is vulnerable to high temperature and intense light stress. This is evident from the noticeable curling, yellowing, and wilting of ginger leaves, as well as a decrease in chlorophyll index and an increase in MDA content. Our investigation confirms that ginger plants activate multiple stress response pathways, including the SOD and CAT antioxidant defenses, and adjust their response over time by switching to different pathways. Additionally, we observe that the expression levels of genes involved in different stress response pathways, such as SOD, CAT, LOX, and NR, are differently regulated under stress conditions. These findings offer avenues to explore the stress mechanisms of ginger in response to high temperature and intense light. They also provide interesting information for the choice of genetic material to use in breeding programs for obtaining ginger genotypes capable of withstanding high temperatures and intense light stress.
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Louvart, Hélène, Stefania Maccari, and Muriel Darnaudéry. "Prenatal stress affects behavioral reactivity to an intense stress in adult female rats." Brain Research 1031, no. 1 (January 2005): 67–73. http://dx.doi.org/10.1016/j.brainres.2004.10.025.
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Akiyama, Morito, Chao-Nan Xu, and Kazuhiro Nonaka. "Intense visible light emission from stress-activated ZrO2:Ti." Applied Physics Letters 81, no. 3 (July 15, 2002): 457–59. http://dx.doi.org/10.1063/1.1494463.
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Akiyama, Morito, Keiko Nishikubo, and Kazuhiro Nonaka. "Intense visible light emission from stress-activated SrMgAl6O11:Eu." Applied Physics Letters 83, no. 4 (July 28, 2003): 650–52. http://dx.doi.org/10.1063/1.1594828.
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Zhao, Cang, and Yu Qiao. "Fast-condensing nanofoams: Suppressing localization of intense stress waves." Materials Science and Engineering: A 676 (October 2016): 450–62. http://dx.doi.org/10.1016/j.msea.2016.09.021.
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Tondato Arantes, Leticia, Bruno Henrique Tondato Arantes, Pedro Rogerio Giongo, Guilherme Zavatti Ceccato, Victor Hugo Moraes, Youlia Kamei Saito, Luiz Fernando Gomes, and Alan Carlos de Oliveira Castro. "COMPORTAMENTO ESPECTRAL E DETECÇÃO DE LARANJEIRAS (Citrus sinensis L. Osbeck) COM ESTRESSE HÍDRICO, POR MEIO DE DRONE." Revista Brasileira de Geografia Física 13, no. 07 (February 1, 2021): 3625. http://dx.doi.org/10.26848/rbgf.v13.07.p3625-3635.
Анотація:
O Brasil é um dos maiores produtores mundiais de laranja e o maior exportador de suco da fruta, o que destaca a importância do estudo e da melhoria do pomar de citrus. Entretanto, em decorrência dos períodos de seca, ocorre déficit hídrico, consequentemente resultando em perdas de produtividade. Desse modo, surgem novas tecnologias e ferramentas que viabilizam o monitoramento e gerenciamento desse tipo de cultura, de forma rápida e menos onerosa. Nesse sentido, esse trabalho objetivou identificar a melhor banda para a detecção de plantas sem estresse hídrico e com estresse hídrico intenso, bem como o melhor índice de vegetação para o mapeamento dessas áreas, incluindo também a possiblidade de mapear estresse hídrico moderado, por meio de imagens de alta resolução espacial obtidas através de um sensor que opera na faixa do visível, embarcado em um veículo aéreo não tripulado. Foram avaliados diferentes índices de vegetação para a identificação e o mapeamento das regiões e/ou plantas de citrus com estresse hídrico, bem como o comportamento espectral destas plantas que apresentaram estresse hídrico intenso e as que não apresentaram, utilizando as bandas RGB do Phantom 4 Advanced. Das bandas RGB, a resposta espectral da banda do azul apresentou-se como a melhor na identificação de plantas sem e com estresse hídrico intenso. O uso de índices de vegetação melhorou as análises das imagens de alta resolução espacial, principalmente, no que diz respeito a identificação de regiões do pomar que possuem déficit hídrico. Os índices de vegetação mais eficientes na identificação de plantas com estresse hídrico intenso, moderado e sem estresse hídrico foi o IAF, seguido pelos COM, ExR, ExGR, CIVE e TGI. Spectral behavior and detection of orange (Citrus sinensis L. Osbeck) with water stress, through drone use A B S T R A C TBrazil is one of the world's largest orange producers and the largest exporter of fruit juice, which highlights the importance of the study and the improvement of the citrus orchard. However, due to drought periods, there is a water deficit, consequently resulting in losses in productivity. In this way, new technologies and tools emerge that enable the monitoring and management of this type of culture, in a quick and less costly way. In this sense, this work aimed to identify the best band for the detection of plants without water stress and with intense water stress, as well as the best vegetation index for the mapping of these areas, including also the possibility of mapping moderate water stress, through high spatial resolution images obtained through a sensor that operates in the visible range, embedded in an unmanned aerial vehicle. Different vegetation indexes were evaluated for the identification and mapping of regions and / or citrus plants with water stress, as well as the spectral behavior of these plants that presented intense water stress and those that did not, using the RGB bands Phantom 4 Advanced. Of the RGB bands, the spectral response of the blue band was the best in identifying plants without and with intense water stress. The use of vegetation indices improved the analysis of high spatial resolution images, mainly with regard to the identification of regions in the orchard that have water deficit. The most efficient vegetation indexes in the identification of plants with intense, moderate water stress and without water stress was the IAF, followed by COM, ExR, ExGR, CIVE and TGI.Keywords: Precision agriculture, UAV, Remote sensing, Vegetation index.
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Hallam, Justus, Cole Sanderson, Young Je Sim, David Senchina, Ishrat Sultana, and Marian Kohut. "Toll-like receptor expression is altered by stress of intense physical conditioning (135.28)." Journal of Immunology 182, no. 1_Supplement (April 1, 2009): 135.28. http://dx.doi.org/10.4049/jimmunol.182.supp.135.28.
Анотація:
Abstract Periods of intense physical training are associated with an increased incidence of infection. We hypothesize that the TLR pathways involved in the initial response to multiple pathogens are compromised during intense physical exercise stress. In order to test this hypothesis, eight male collegiate wrestlers participated in one month of intense physical conditioning stress. Blood was collected at rest both before and after a 1 month period of intense exercise, and after completing a single 90 minute session of exhaustive exercise. TLR receptor pathway expression was assessed by microarray. The results showed that 1 month of intense exercise conditioning decreased expression of genes that may be important in antiviral defense (IFN-alpha, TLR3, PKRKA, SARM1), and inflammatory response (TNFSRF, PTGS2, REL). Ninety minutes of intense exercise decreased IFN-gamma and IRF1, but expression of TLR pathways associated with anti-bacterial defense increased (TLR5, TIRAP, PGLYRP2, LY86). These findings are consistent with epidemiological data suggesting an increased incidence of respiratory viral infections during periods of intense physical exercise stress. The results also implicate several genes important in inflammation, and further research is needed to determine whether these genes play a significant role in the recently reported anti-inflammatory effects of repeated exercise.
Дисертації з теми "Stress intense":
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Crotogino, Jennifer. "Visual stress in migraine : subjective and psychophysiological responses to intense visual stimulation." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38475.
Анотація:
This dissertation assesses whether intense visual stimulation can act as a stressor to migraine sufferers between attacks, and whether subjective and psychophysiological reactions to these stimuli can clarify how migraine attacks may be triggered.The first study assessed thresholds of light-induced discomfort and pain in migraine sufferers and non-migrainous controls during a non-headache period. Two instruction sets were compared to assess whether information presented to participants would affect thresholds. The results showed that migraineurs had significantly lower thresholds for light-induced pain. However, this effect was most apparent in those who had heard the negatively biased instructions reinforcing the need to control contextual factors when assessing subjective phenomena such as visual discomfort.
The second study assessed subjective and psychophysiological responses of female migraine sufferers and female controls during exposure to visual stimuli incorporating spatial and temporal characteristics that are most likely to be bothersome to migraineurs. Two control stimuli were included to assess responses during similar, but theoretically less aversive conditions. Migraine sufferers had higher heart rate and more frequent electrodermal responses than controls at all points of the study, including baseline and recovery. However, while migraineurs reported higher anxiety during the intense conditions, and reported more visual and somatic complaints than controls during various viewing conditions, they did not show heart rate, heart rate variability or electrodermal changes that would suggest clear changes in autonomic function in response to aversive visual stimulation.
The third study assessed ambulatory electrocardiograms to investigate whether autonomic changes would be evident in the period leading up to, during or following a migraine. Three individuals were assessed on a day when they experienced a naturally occurring headache, and on a day when they were not. No obvious pattern of autonomic change was detected before or after headache, although there was some evidence that a pattern of increased heart rate and decreased vagal tone may accompany headache.
In summary, the results confirm that migraine sufferers are more sensitive to intense visual stimulation than controls, but do not support the contention that exposure results in widespread autonomic changes. Since interictal visual discomfort is a common in migraine, further research is needed to clarify how it can be incorporated into models of migraine pathophysiology.
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Salter, William Thomas. "Growing in Australia – plant strategies to survive intense solar radiation and soils lacking in phosphorus." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15479.
Анотація:
Sunlight is essential to plants as the main energy source for photosynthesis, yet excess light that cannot be processed in photosynthesis can be damaging. Australian plants are regularly exposed to very intense light, enriched in ultraviolet (UV) radiation, placing them at direct risk of photodamage. Low inorganic phosphate (Pi) availability, characteristic of Australian soils, can reduce the energy threshold of photosynthesis and exacerbate photodamage. Whilst intense light and low Pi are common in Australian ecosystems, relatively little is known about the strategies generalist plant species use to overcome these stressful conditions. This thesis addresses this gap in scientific knowledge, increases general understanding of plant stress responses and identifies traits associated with stress tolerance that could be exploited in future crops. This thesis investigates the individual and combined impacts of solar UV, light intensity and Pi availability on plant physiology, development and biochemistry in native and domesticated Australian plants. Spectral screens allowed assessment of plant responses to solar UV components; short-term responses to changes in Pi availability were investigated by adding exogenous P, and biochemical strategies to tolerate long-term Pi limitation were ascertained by using paired sub-alpine ecosystems with naturally contrasting availability of Pi. Throughout the studies reported in this thesis, it was clear that both native and agricultural plants have evolved strategies to cope with intense light and soils lacking in phosphorus. The biggest distinction was that these adaptive responses were adequate to alleviate potential reductions in photosynthetic rate for crop species, yet in native plants these responses reduced rates of photosynthesis. From an agricultural perspective, this suggests that genetically inherited traits from native plants could increase tolerance to environmental stress in crop species but at a cost to plant productivity.
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Bartlett, Michelle. "Intense training in sport monitoring the effects on immune function and mood state /." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4902.
Анотація:
Thesis (M.S.)--West Virginia University, 2006.Title from document title page. Document formatted into pages; contains viii, 96 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
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Sellami, Maha. "Etudes de l'avance en âge (deux décennies) et de l'entrainement anaérobie(sprint et musculation) sur les réponses métaboliques et hormonales à l'exercice supramaximal." Phd thesis, Université Rennes 2, 2014. http://tel.archives-ouvertes.fr/tel-01037945.
Анотація:
L'objectif de ce travail de thèse est d'étudier les effets de l'avance en âge (seulement deux décennies, 20-40 ans) et d'un programme d'entraînement combiné (Sprint et Musculation) sur les performances et les réponses métaboliques et hormonales à l'exercice supramaximal (Wingate-test). Quatre groupes de sujets ont participé à ce travail. Ils ont été répartis selon l'âge en 2 groupes expérimentaux (âgés de 20 et 40 ans) et en groupes contrôles (âgés de 20 et 40 ans). Les résultats montrent que l'entraînement anaérobie de type sprint et musculation s'accompagne d'une augmentation significative du volume plasmatique chez le sujet entrainé (jeune et âgé). Ces changements du volume plasmatique ont été accompagnés par une augmentation des performances physiques et de la lactatémie pic mesurée à la fin de l'exercice Wingate chez les groupes entrainés. Des adaptations endocriniennes sont probablement à l'origine de ces modifications liées à l'entrainement intense. En effet, après entrainement, nous avons observé une augmentation significative des catécholamines (au repos et à l'exercice) chez les sujets âgés entrainés par rapport aux plus jeunes entrainés. La différence liée à l'âge entre jeune et âgée disparait après entrainement seulement entre les groupes entrainés. Le même constat a été observé concernant les concentrations plasmatiques de glucose et d'insuline chez les groupes entrainés après entrainement. Ces changements du métabolisme de glucose sont accompagnés d'une augmentation de la production du cortisol, de la testostérone et de son hormone porteuse chez le groupe âgé entrainé en particulier. La sécrétion de l'hormone de croissance (GH) a augmenté également en dépit de la différence d'âge après entrainement accompagnée de l'augmentation des taux d'IGF1 et d'IGFB3 chez le groupe âgé entrainé en particulier. En conclusion de ce travail de thèse, il semble qu'un entraînement adéquat de sprint et de musculation serait un bon moyen pour réduire et atténuer les effets délétères de l'avance en âge sur la performance anaérobie, les réponses métaboliques et les sécrétions hormonales.
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Driss, Sana. "Effet d'un apport exogéne en resvératrol sur le stress oxydatif induits par un exercice physique intense chez des cyclistes." Thèse, Université du Québec à Trois-Rivières, 2010. http://depot-e.uqtr.ca/1330/1/030168167.pdf.
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Venturi, Linda. "Etude des propriétés de photoluminescence de nano-matériaux sous champ électrique intense." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR118.
Анотація:
Dans cette thèse, la tomographie à sonde atomique assistée par laser est couplée in situ à un banc de photoluminescence (PL), où le rayonnement laser pulsé est utilize pour déclencher l’évaporation ionique des échantillons et, simultanément, pour activer l’émission à partir des centres optiquement actifs présents dans le matériau. Pour ce travail, deux matériaux différents ont été sélectionnés : des nano-aiguilles de diamant avec des défauts optiquement actifs intégrés (centres de couleur) et une hétérostructure multi-quantique (MQW) ZnO / (Mg, Zn)O, qui contient des émetteurs quantiques d’épaisseurs différentes. Grâce à cette configuration originale de photoluminescence, l’influence du champ électrique sur la structure fine de certains centres de couleur, noyés dans les nano-aiguilles de diamant, a été observée. La première étude s’est concentrée sur le centre neutre de vacance d’azote (NV0), qui est l’un des centres de couleur les plus étudiés dans la littérature. L’évolution de la signature optique NV0, en fonction du biais appliqué, a permis d’évaluer la contrainte mécanique (> 1 GPa) et le champ électrique agissant sur les pointes de diamant. Ces résultats démontrent une nouvelle méthode originale pour effectuer la piezo-spectroscopie sans contact des systems nanométriques sous une contrainte de traction uniaxiale, générée par le champ électrique. Cette méthode a également été appliquée à un autre centre de couleur, dont la nature n’est toujours pas claire dans la littérature, émettant à 2,65 eV, et plus sensible que les centres de couleur NV0 au champ de contrainte / déformation. Des nouveaux résultats sur ses propriétés opto-mécaniques ont été obtenus, mais son identité reste à comprendre. Le champ d’évaporation du diamant étant très élevé, les nano-aiguilles de diamant n’ont pas été analysées à l’aide de La-APT. Par conséquent, la technique couplée in situ a été appliquée afin d’étudier l’hétérostructure ZnO / (Mg, Zn) O MQW, en accédant à la structure, à la composition et à la signature optique de l’échantillon sondé dans une seule expérience. Les spectres de photoluminescence acquis par le spécimen au cours de son évaporation en cours représentent une source unique d’informations pour la compréhension du mécanisme de l’interaction lumière-matière et la physique de la photoémission sous champ électrique élevé. La corrélation des informations structurelles et optiques, liées à cette hétérostructure MQW, démontre que la technique couplée in situ peut chevaucher la limite de diffraction du laser PL et que, comme pour les nano-aiguilles de diamant, il est possible d’estimer le stress de traction induit. Les résultats obtenus par couplage in situ de la technique La-APT avec la spectroscopie PL montrent qu’un tel instrument est une technique innovante et puissante pour effectuer des recherches à l’échelle nanométrique. Pour cette raison, ce travail peut ouvrir de nouvelles perspectives pour une compréhension approfondie de la physique liée aux systèmes étudiés en parallèle avec l’amélioration continue de la configuration expérimentaleIn this thesis, the Laser-assisted Atom Probe Tomography is coupled in-situ with a photoluminescence (PL) bench, where the pulsed laser radiation is used to trigger the ion evaporation from the specimens and, simultaneously, to activate the emission from optically active centers present into the material. For this work, two different materials were selected: diamond nano-needles with embed- ded optically active defects (color centers) and a ZnO/(Mg,Zn)O multi-quantum-well (MQW) heterostructure, which contains quantum emitters of different thicknesses. Thanks to this original photoluminescence setup, the influence of the electric field on the fine structure of some color centers, embedded into the diamond nanoneedles, was observed. The first study focused on the neutral nitrogen-vacancy center (NV0), which is one among the most studied color centers in literature. The evolution of the NV0 optical signature, as a function of the applied bias, allowed to evaluate the mechanical stress (> 1 GPa) and the electric-field acting on diamond tips. These results demon- strate an original new method to perform contactless piezo-spectroscopy of nanoscale systems under uniaxial tensile stress, generated by the electric field. This method was applied also on another color center, which nature is still not clear in literature, emitting at 2.65 eV, and more sensitive than the NV0 color centers to the stress/strain field. New results on its opto-mechanical properties were obtained, but its identity still needs to be understood. Since the evaporation field of diamond is really high, the diamond nanoneedles were not analyzed using La-APT. Therefore the coupled in-situ technique was applied in order to study the ZnO/(Mg,Zn)O MQW heterostructure, accessing to the structure, composition and optical signature of the probed specimen in only one experiment. The photoluminescence spectra acquired by the specimen during its ongoing evaporation represents a unique source of information for the understanding of the mechanism of light-matter interaction and the physics of photoemission under high electric field. The correlation of the structural and optical information, related to this MQW heterostructure, demonstrates that the coupled in-situ technique can overlap the diffraction limit of the PL laser and that, as done for the diamond nanoneedles, is pos- sible to estimate the induced-tensile-stress. The results achieved by the in-situ coupling of the La-APT technique with the PL spec- troscopy show that such instrument is an innovative and powerful technique to perform research at the nanometric scale. For this reason, this work can open new perspectives for a deeply understanding of the physicics related to the studied systems in parallel with the continuous enhancement of the experimental setup
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Tocchetto, Guilherme Lopes. "ADAPTAÇÕES FUNCIONAIS E BIOQUÍMICAS DE JOGADORES DE FUTSAL DE ALTO NÍVEL EM DIFERENTES PERÍODOS DA TEMPORADA." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/6736.
Анотація:
The high-level sport requires a routine of intense training, high-levels players are exposed to various situations that may cause decline in their performance over a season. Therefore, the aim of this study was to verify functional and biochemical markers on elite level futsal players throughout a competition season. Eight players were analyzed statistically after being submitted to three maximal tests during the year: preseason (T1), competitive period (T2), and at the end of the season (T3). Functional parameters were assessed and blood sampling for cell count, lipid profile, inflammation, injury-related, and oxidative stress markers were performed before and after an maximum VO₂ test each time point. No differences were found for functional and lipid profile measurements. However, differences for total number of neutrophlis, monocytes, hemoglobin, creatine kinase, C-reactive protein, ischemia modified albumin, and advanced oxidation protein products between time points throughout the season were found. Blood lactate and lactate dehydrogenase levels showed differences within pre x post tests. Lower levels of inflammation, oxidative stress, and injury-related markers were found on T2 compared to T1 and T3, indicating that players were adapted to the training load. Although complementary studies are needed, it seems that routine-based biochemical markers may be used as training control means in this population.O esporte de alto nível exige uma rotina de treinamento intenso, jogadores de futsal de alto nível são expostos a diversas situações que podem provocar declínio na sua performance ao longo de uma temporada. Portanto, o objetivo desse estudo foi verificar marcadores funcionais e bioquímicos ao longo de uma temporada de competição. Foram estudados oito jogadores de futsal submetidos a três testes de esforço máximo durante o ano competitivo: Pré temporada (T1), Período Competitivo (T2) e Final de Período Competitivo (T3). Foram mensurados parâmetros funcionais e, também, amostras de sangue para contagem de células, perfil lipídico, marcadores de inflamação, dano muscular e estresse oxidativo realizados antes e depois um teste máximo de VO₂ em cada período. Não foram encontradas diferenças significativas nos parâmetros funcionais, nem no perfil lipídico. No entanto, foram encontradas diferenças relativas ao número de neutrófilos, monócitos, hemoglobina, creatina quinase, proteína c-reativa, albumina modificada por isquemia e produto proteico de oxidação avançada nos diferentes períodos da temporada. Lactato sanguíneo e lactato desidrogenase mostraram diferenças dentro dos testes pré x pós. Os menores níveis de inflamação, estresse oxidativo e marcadores de dano muscular foram encontrados no T2 em relação ao T1 e T3, indicando que os jogadores se adaptaram as cargas de treinamento. Embora sejam necessários estudos complementares, parece que uma rotina de análises de marcadores bioquímicos pode ser utilizada para um controle dessa população.
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Heyrendt, Laurent. "Études des actions des forces magnétiques volumiques créées par un champ magnétique intense sur des fluides à seuil - possibilités de transition solide-gel." Phd thesis, Université de Lorraine, 2012. http://tel.archives-ouvertes.fr/tel-00799586.
Анотація:
Les fluides à seuil ont des propriétés mécaniques étonnantes : en dessous d'une certaine contrainte, appelée contrainte seuil, le fluide se comporte comme un solide. Au-delà de la contrainte seuil, ils s'écoulent comme un gel. Ce mémoire porte sur l'étude des actions des forces magnétiques volumiques sur ces fluides. Nous étudions la possibilité de réaliser la transition solide--gel à partir des forces magnétiques volumiques créées par différents dispositifs magnétiques. Ces fluides n'ont pas de propriétés magnétiques particulières. Il est donc nécessaire de créer des champs magnétiques intenses pour agir sans contact sur ces fluides. Nous étudions différentes configurations magnétiques capables de dépasser la contrainte seuil au sein du fluide. L'influence des différents paramètres des configurations magnétiques est explorée, notamment à l'aide d'études paramétriques. Notre travail mêle des équations de magnétostatique et de mécanique des fluides non-newtoniens. Les calculs de magnétostatique sont menés de façon analytique alors que la partie mécanique et le couplage magnéto-mécanique sont traités par un logiciel de simulation numérique par la méthode des éléments finis. Les conditions magnétiques et mécaniques nécessaires à la transition solide--gel et à la modification d'écoulements de fluides à seuil sont discutées, notamment à l'aide de simulations numériques et de nombres adimensionnels.
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Delamare, Jeremy. "Analyses de deux stratégies d’acclimatation à un stress thermique intense reposant sur une thermo-sensibilisation ou une sensibilisation médiée par des bactéries PGPR chez le colza et la caméline." Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMC243.
Анотація:
Le changement climatique auquel nous sommes confrontés est caractérisé notamment par une modification des profils thermiques en termes d’intensité, de durée et de répétition des vagues de chaleur. Ces vagues de chaleur surviennent lors des stades reproducteurs des plantes qui sont également les plus critiques pour l’élaboration des composantes de rendement et des critères de qualité grainière des grandes cultures. Les oléagineux tels que le colza et la caméline sont des espèces particulièrement impactées par le stress thermique, causant de fortes pertes de rendement et une diminution de la qualité grainière. Ainsi, il est nécessaire d’identifier de nouveaux leviers d’acclimatation, telles que des stratégies reposant sur l’acclimatation des plantes. Le thermopriming consistant à préparer les plantes à répondre de façon plus rapide, efficace, intense et/ou sensible à un stress thermique par une exposition préalable à un stress de même nature pourrait permettre d’acclimater les plantes qui mettraient en place des mécanismes de réponses adaptés. L’inoculation des plantes avec des PGPR est un levier d’acclimatation de plus en plus étudié, qui permet de limiter les impacts du stress thermique. Cependant, bien que ces deux types de stratégies d’acclimatation soient principalement étudiés pour limiter l’impact des stress sur le développement des parties aériennes et sur le rendement, peu d’études se sont intéressées à leurs effets sur la morphologie et les fonctions racinaires comme l’exsudation racinaire. Dans le cadre de cette thèse, nous avons analysé chez le colza et la caméline (i) d’une part les effets d’une augmentation graduelle de température précédant un stress thermique, sur le rendement et la qualité grainière et sur la morphologie et l’exsudation racinaire et (ii) d’autre part les effets de l’inoculation de deux Pseudomonas présentant des activités PGPR afin de limiter les impacts du stress thermique sur le rendement et la qualité grainière. De plus, afin de connaitre l’impact du stress thermique et de l’inoculation de PGPR (combinés ou non) sur la plante et la rhizosphère associée, les effets de ces traitements ont été étudiés sur l’exsudation racinaire, l’allocation de carbone (C) dans le système sol-plante, les traits morphologiques racinaires et les communautés microbiennes du sol. Nos résultats ont montré que le colza et la caméline présentent des stratégies contrastées quant à leur réponse au stress thermique. En effet, la caméline semble réagir au stress en augmentant son investissement dans les parties racinaires, en améliorant qualitativement son exsudation et en stimulant l’activité des communautés microbiennes à l’inverse du colza qui semble plutôt endurer le stress. De plus, ces deux espèces ont réagi différemment aux deux stratégies d’acclimatation appliquées. En effet, chez le colza, le thermopriming a permis de diminuer l’exsudation en C et de maintenir son rendement et sa qualité grainière alors qu’il a eu un impact plus négatif sur l’exsudation et la morphologie racinaire chez la caméline. L’inoculation des PGPR est une stratégie d’acclimatation qui tend à limiter les effets du stress thermique sur le rendement et la qualité grainière chez le colza. Cependant, les PGPR agissent comme un puits supplémentaire chez le colza impactant son développement, son exsudation ainsi que l’activité et la composition des communautés microbienne. A l’inverse, la caméline est peu impactée par l’apport de PGPR et semble par conséquent piloter les interactions plante/bactéries plutôt que les subir. En résumé, ces leviers d’acclimatation semblent démontrer des effets bénéfiques pour les plantes. De plus, il pourrait être intéressant d’intégrer les effets de la sélection variétale sur les stratégies de réponses des plantes face au stress et notamment la variabilité des fonctions racinaires et des interactions avec la rhizosphère, à la lumière de la sélection variétale différentiellement subie par le colza et la camélineThe on-going climate changes that we are facing are characterized in particular by modifications of temperature profiles in terms of intensity, duration and repetition of heat waves. These heat waves occur during the reproductive stages of the crops, which are also the most critical for seed yield elaboration and grain quality in crops. Oleaginous species such as rapeseed and camelina, are species particularly impacted by heat stress that cause yield penalties and a lower seed quality. Therefore, to cope with heat stress, it has become necessary to identify new acclimation levers that differ avec genetic and agronomic levers, such as strategies based on plants acclimation. Thermopriming which consist in priming the plants in a way to help them respond more rapidly, effectively, intensively and/or sensitively to heat by a prior exposure of a stress of the same nature could allow the plants to acclimate and develop appropriate response mechanisms. The plant inoculation with Plant Growth Promoting Rhizobacteria (PGPR)-type bacteria is also an acclimation lever increasingly studied, that limit the impacts of abiotic stress such as heat stress. However, although these two types of acclimation levers are mainly studied to limit stress impact on aboveground development and yield, few studies have observed their effects on root morphology and functions such as root exudation. In this thesis we analysed in rapeseed and camelina (i) the effects of a gradual increase in temperature prior a heat stress on yield and grain quality and on root morphology and exudation and (ii) the effects of inoculating two Pseudomonas with PGPR activities in order to limit the impact of heat stress on yield and grain quality. Moreover, in order to understand the impact of heat stress and PGPR inoculation (combined or not) on the plant and associated rhizosphere, the effects of these treatments were studied on root exudation, carbon (C) allocation in the soil-plant system, root morphological traits and soil microbial communities. Our results showed that rapeseed and camelina have contrasting strategies in terms of response to heat stress. Indeed, camelina seems to respond to the stress by increasing its investment to the roots thus improving the quality of exudation and stimulating the activity of microbial communities, unlike rapeseed, which seems to undergo heat stress. In addition, these two species respond differently to the two acclimation strategies applied. In rapeseed, thermopriming reduced C exudation and maintained yield and grain quality, whereas it had a more negative impact on exudation and root morphology in camelina. PGPR inoculation is an acclimation strategy that tends to limit the effects of heat stress on yield and grain quality in rapeseed. However, PGPRs act as an additional sink in rapeseed, impacting its development, exudation and the activity and composition of microbial communities in the rhizosphere. By contrast, camelina is slightly affected by the addition of PGPRs and seems to control the plant/bacteria interactions rather than be affected by them. In short, beneficial effects on plants of these acclimation levers have been evidenced. In addition, it could be interesting to integrate the effects of varietal selection on plant response strategies to stress, and in particular the variability of root functions and interactions with the rhizosphere, in the light of the varietal selection differentially undergone by rapeseed and camelina
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Lardant, Emma. "Hétérogénéité de la réponse à un stress de forte intensité : Évidences comportementale, neurobiologique et hypnique chez la souris." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASL003.
Анотація:
Le trouble de stress post- traumatique (TSPT) est un trouble mental qui affecte certaines personnes exposées à un stress de forte intensité. L’hétérogénéité d’expression des différents symptômes pourraient expliquer l’absence de traitement efficace et/ou la rechute des patients. Ces sous-types de symptômes sont associés à des activités cérébrales spécifiques, leur meilleure compréhension semble alors cruciale pour la recherche de traitement plus personnalisé et donc plus efficace. Dans ce contexte, le comportement de souris non consanguines a été évalué par plusieurs tests pendant 28 jours après avoir reçu deux chocs électriques de forte intensité. Une analyse des profils comportementaux en deux étapes a permis de révéler trois phénotypes chez les animaux exposés au stress de forte intensité. La première étape, basée sur un score composite des comportements de type anxiété généralisée, a permis de dissocier les animaux résilients et susceptibles et d’établir un score de sévérité des altérations comportementales. La seconde étape, axée sur les comportements de défense persistants lors de différentes réexpositions à des stimuli associés aux chocs électriques, a permis d’identifier deux phénotypes comportementaux chez les animaux susceptibles : Les immobiles et les fuyants. L’analyse de l’expression cellulaire de la protéine Fos a mis en évidence des activations cellulaires distinctes au niveau de l’amygdale (AMG) et de la substance grise périaqueducale (PAG). Plus précisément, la sévérité des altérations comportementales de type TSPT est corrélée positivement à l‘activation de l’AMG droite et les phénotypes susceptibles sont associés à des activations différentes le long de l’axe antéropostérieur de la PAG. Les analyses de sommeil mettent également en évidence des différences entre les trois phénotypes d’animaux. En particulier, le sommeil paradoxal semble être un marqueur de résilience post- exposition mais également un indicateur de susceptibilité au développement de la pathologie avant exposition. En conclusion, en montrant des activations cérébrales distinctes et des effets différentiels sur le sommeil dans les trois phénotypes d’animaux, cette étude montre l’importance d’analyser les profils comportementaux chez la souris. Le raffinement des méthodes d’analyses de ce type devrait renforcer la validité translationnelle du modèle de TSPT, ouvrant ainsi de nouvelles perspectives pour des traitements plus personnalisésPost-Traumatic Stress Disorder (PTSD) is a mental disorder that affects some individuals exposed to high-intensity stress. The heterogeneity in the expression of various symptoms could explain the lack of effective treatment and/or patient relapse. These subtypes of symptoms are associated with specific brain activities; their better understanding appears crucial for the pursuit of more personalized and thus more effective treatment. In this context, the behavior of outbred mice was evaluated through various tests for 28 days after receiving two high- intensity electric shocks. An analysis of behavioral profiles in two steps revealed three phenotypes in animals exposed to high-intensity stress. The first step, based on a composite score of generalized anxiety-like behaviors, allowed for the differentiation of resilient and susceptible animals and the establishment of a severity score for behavioral alterations. The second step, focused on persistent defensive behaviors during different re-exposures to stimuli associated with electric shocks, identified two behavioral phenotypes in susceptible animals: immobile and fleeing. Analysis of the cellular expression of the Fos protein highlighted distinct cellular activations in the amygdala (AMG) and the periaqueductal gray matter (PAG). Specifically, the severity of PTSD- like behavioral alterations is positively correlated with right AMG activation, and susceptible phenotypes are associated with different activations along the anteroposterior axis of the PAG. Sleep analysis also revealed differences among the three animal phenotypes. In particular, rapid eye movement (REM) sleep appears to be a marker of post-exposure resilience but also an indicator of susceptibility to pathology development before exposure. In conclusion, by demonstrating distinct brain activations and differential effects on sleep in the three animal phenotypes, this study highlights the importance of analyzing behavioral profiles in mice. Refinement of analysis methods of this kind should enhance the translational validity of the PTSD model, thus opening new perspectives for more personalized treatments
Книги з теми "Stress intense":
1
Ellerby, Jonathan H. Trouble déficitaire de l'inspiration: Une prescription sans pilule pour mettre fin au stress intense, au manque d'énergie et aux mauvaises habitudes. Varennes, Québec: AdA éditions, 2011.
2
Dyzenhaus, David. Proportionality under stress: Intensive course. 2nd ed. [Toronto]: University of Toronto, Faculty of Law, 2009.
3
LeClaire, Sophie E. Intensive care units: Stress, procedures and mortality rates. Hauppauge, N.Y: Nova Science Publisher's, 2011.
4
Wyly, M. Virginai. Stress and coping in the neonatal intensive care unit. Tucson, Arizona: Communication Skill Builders, 1990.
5
Marion, Robert. Rotations: The twelve months of intern life. New York: HarperCollins, 1997.
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Saxon, Ridley, and Intensive Care Society (Great Britain), eds. The psychological challenges of intensive care. Malden, Mass: Blackwell Pub., 2005.
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Volovik, Mihail, I. Dolgov, and Dmitriy Hripkovskiy. Stress tests for medical thermography. ru: INFRA-M Academic Publishing LLC., 2023. http://dx.doi.org/10.12737/monography_646341497049a9.30616752.
Анотація:
In this "how-to-use" manual the authors presetnted the theory and practice of stress tests application in medical thermography
Stress test classification along with theoretical principles of sampling selection and results interpretations are described.
The publication is intended for doctors of any specialty, using medical thermography in their clinical routine
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Howard, Ruth A. Stress and the coping process: A survey of intensive care unit nurses. Birmingham: University of Birmingham, 1993.
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Satō, Shūhō. Burakku Jakku ni yoroshiku: Seishinka hen 3. Tōkyō: Kōdansha, 2005.
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Satō, Shūhō. Burakku Jakku ni yoroshiku: Seishinka hen 4. Tōkyō: Kōdansha, 2005.
Частини книг з теми "Stress intense":
1
Rowe, Leanne, Vihangi Abeygunawardana, and Michael Kidd. "Staying mentally strong through intense stress." In Every Doctor, 19–27. 2nd ed. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003296829-4.
2
Krafft, Andreas M., JohnBosco Chika Chukwuorji, Rajneesh Choubisa, Stella Comte, Fabien Fenouillet, Valle Flores-Lucas, Tharina Guse, et al. "Mastering the COVID-19 Pandemic Crisis: From Anxiety to Hope." In Hope across cultures, 327–405. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-24412-4_9.
Анотація:
AbstractThis chapter presents selected results of the Hope Barometer survey during the pandemic years of 2020 and 2021. Against the background of the intense feelings of stress and anxiety in these times of crisis, we first review current theories on psychological stress and coping, present results of our empirical studies during the pandemic and then focus on the role and importance of hope in relation to positive coping styles, well-being, and stress-related personal growth. A central aim of our research is to investigate the role of culture in the perception of stress and hope (as the counterpart of anxiety) and in the choice of different coping strategies, as evident in their relationship to experiences of well-being and personal growth. We compared the results of 11 countries with cross-sectional data collected in November 2019 (N = 9092), November 2020 (N = 9536) and November 2021 (N = 9093). After reporting general findings, we engage in an analysis of the most striking differences between the countries. Our results revealed that a majority of the participants experienced moderate stress levels, but with significant differences between the samples and notable changes between 2020 and 2021. Most people, especially in more collectivistic countries such as Nigeria, South Africa, India, and Portugal, remained hopeful, applied positive coping strategies, and enjoyed moderate to high levels of well-being and personal growth. Our findings highlight the importance of emotion-focused, social, and religious coping sources, besides problem-focused coping, for mastering the crisis, which are predominant in collectivistic societies.
3
Yu, Jian-qiang, Qi Li, Yong-lu Wang, and Shuai Tao. "Numerical Simulation of Rockburst Characteristics of Tunnel Surrounding Rock Under Dilatancy Effect." In Advances in Frontier Research on Engineering Structures, 163–73. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_15.
Анотація:
AbstractRockburst is one of the most intense reactions in various instability phenomena of underground cavern surrounding rock, which seriously threatens the safety of underground engineering construction personnel and equipment. Based on Mohr–Coulomb strain softening model, the non-associated flow rule is adopted for plastic flow after material yield. By implanting Gu Ming-cheng and Tao Zhen-yu rockburst criterion in the software, the effects of different dilatancy angles on rockburst grade and circumferential stress distribution of surrounding rock of circular tunnel are simulated. The calculation results show that the larger the dilatancy angle is, the more difficult the rock burst pit is to form. The elements of serious rockburst are mainly concentrated in the wall of the tunnel, and the shear bands formed in the high value area of shear strain increment are short. When the dilatancy angle is small, the circumferential stress reaches the maximum at the interface of elastic-plastic zone. With the increase of dilatancy angle, the number of elements entering the plastic state and occurring medium and severe rockburst increases first and then decreases, while the number of elements occurring slight rockburst decreases monotonously. Different dilatancy angles have significant effects on the number of elements occurring rockburst at all levels.
4
Petrucci, Anna Laura. "Environmental Retrofitting, Fighting Urban Heat Island Toward NEZ Sustainable Smart Cities." In Smart Cities, 111–20. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-35664-3_8.
Анотація:
AbstractThe discovery of the physical phenomenon of heat island dates back to 1833 when Luke Howard undertakes on the air temperature in London and its surroundings. His research showed how, already at that time, winds get stopped and pulled up by the intensive urbanization, reducing the quality of the outdoor environment while turning cold into warmer areas within the urban settlements (Mills 2008). The last centuries confirmed how intense urbanization can make the temperature rise to several degrees, activating a vicious circle where car and energy use become more necessary, and co-cause for further temperature arise. No doubt, cities are—literally—heat islands if compared to their surroundings. The crescent environmental stress is the main challenge while targeting quality of life in today’s urbanization, in order to enable the public space to welcome citizens and encourage their outdoor activities. It requires a consistent commitment to the built environment and the awareness of the main role of public space as an interactive platform for a sustainable and human-centered smart city. As matter of fact, it is the public space where social life shapes and grows. The public space was often defined as the smart city's interface. So, smart cities need to generate and maintain a welcoming, healthy, livable, vibrant public space to have a reason to be. The scope of smart cities is to create a space first, the infrastructure to strengthen the connections among people and between people to the place. (Petrucci 2022) Cities worldwide must respond to a growing and diverse population, ever-shifting economic conditions, new technologies, and a changing climate. The task becomes especially challenging in extreme climate environments, such as in the Far East, in the African continent, or in the GCCs, which are also the countries where the most extensive urbanizations are taking place. Both intense urbanization growth and extreme weather conditions make here mandatory, more than everywhere else, an integrated strategy to achieve livable and sustainable cities through the fight against the urban heat island.
5
Konagai, Kazuo. "Coseismic Stress Changes, Landslides in the 2004 Mid-Niigata Prefecture Earthquake, and Their Impact on Post-quake Rehabilitations." In Progress in Landslide Research and Technology, Volume 1 Issue 2, 2022, 235–46. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18471-0_19.
Анотація:
AbstractThe impact of a large inland earthquake is profound because of its intense shakes and the associated landslides and debris flows. The quake-induced landslides and debris flow are often the most devastating secondary effect of an earthquake in terms of all kinds of losses, causing long-lasting problems in post-quake rehabilitation activities. An earthquake-induced landslide is just one scene of ever-evolving mountain topography. Therefore, studying terrain dynamics is vital to comprehend the possibility of hazards and propose and apply rational rehabilitation tactics. Though serious, the damage caused by the Mid-Niigata Prefecture Earthquake of October 23, 2004, has given us a rare opportunity to study the landform changes caused by an earthquake that hit an active-folding mountainous terrain. To deal with rehabilitation problems in a scientific manner, a research program, “Earthquake damage in active-folding areas: the creation of a comprehensive data archive and suggestions for its application to remedial measures for civil-infrastructure systems,” was set up getting the Special Coordination Funds for Promoting Science and Technology, Ministry of Education, Culture, Sports, Science and Technology (MEXT). This article reviews some significant findings obtained through this project and even beyond it. The results show that essential aspects of quake-caused problems were linked to deep-seated tectonic displacements, namely the internal driving stress field associated with earthquakes to evolve the active-folding terrain.
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Kashani, John, Richard D. Shih, Thomas H. Cogbill, David H. Jang, Lewis S. Nelson, Mitchell M. Levy, Margaret M. Parker, et al. "Stress Proteins." In Encyclopedia of Intensive Care Medicine, 2151. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_2238.
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Harrois, A., E. Vicaut, and J. Duranteau. "The Microcirculation and Oxidative Stress." In Intensive Care Medicine, 3–15. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-5562-3_1.
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Carcillo, J. A. "Critical Illness Stress-induced Immune Suppression." In Intensive Care Medicine, 217–28. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-49518-7_20.
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Karyampudi, S., and M. Singer. "Glycolysis in Sepsis and other Stress Conditions." In Intensive Care Medicine, 881–90. New York, NY: Springer New York, 2003. http://dx.doi.org/10.1007/978-1-4757-5548-0_81.
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Huet, O., A. Harrois, and J. Duranteau. "Oxidative Stress and Endothelial Dysfunction during Sepsis." In Intensive Care Medicine, 59–64. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-92278-2_6.
Тези доповідей конференцій з теми "Stress intense":
1
Ito, Yoshiro, Junichi Tadano, and Masanao Matsukura. "Transient stress field in a sample induced by intense laser pulses." In SPIE Proceedings, edited by Isamu Miyamoto, Henry Helvajian, Kazuyoshi Itoh, Kojiro F. Kobayashi, Andreas Ostendorf, and Koji Sugioka. SPIE, 2004. http://dx.doi.org/10.1117/12.596413.
2
Wang, Xinbing, Junke Jiao, and Xiaohua Wang. "Distributions of temperature and thermal stress in soda-lime glass irradiated by CO." In High Energy/Average Power Lasers and Intense Beam Applications. SPIE, 2007. http://dx.doi.org/10.1117/12.699288.
3
Boote, Dario, and Francesco Cecchini. "Stress Analysis of Bulk Carrier Hatch Corners." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-58047.
Анотація:
Owing to the hull structure complexity and severe load conditions, bulk carrier ships are the subject of an intense research activity by Classification Societies and research centres. Many problems affecting this kind of vessel derive from loading and unloading operations, corrosion and fatigue phenomena and, sometimes, the age of the ship. For what the structural strength is concerned, one of the typical failure causes for bulk carriers is represented by high stress concentrations occurring in deck plating close to hatch corners in way of coaming stay. The aim of this work, performed in cooperation by the Registro Italiano Navale (RINA) and the Department of Naval Architecture and Ship Construction of the University of Genova, is to investigate the stress distribution close to hatch corners in a systematic way, in order to determine and quantify the influence of the selected parameters on this phenomenon.
4
Sekimoto, Atsushi, Vassili Kitsios, Callum Atkinson, Javier Jimenez, and Julio Soria. "INTENSE FOCAL AND REYNOLDS STRESS STRUCTURES OF A SELF-SIMILAR ADVERSE PRESSURE GRADIENT TURBULENT BOUNDARY LAYER." In Tenth International Symposium on Turbulence and Shear Flow Phenomena. Connecticut: Begellhouse, 2017. http://dx.doi.org/10.1615/tsfp10.130.
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VLAS, Irina. "The study of stress at young people." In Ştiință și educație: noi abordări și perspective. "Ion Creanga" State Pedagogical University, 2023. http://dx.doi.org/10.46727/c.v1.24-25-03-2023.p43-46.
Анотація:
Stress and stressful events are part of our life. Until recently, it was considered that stress is not characteristic for young people, they have a normal life without special pressures. Nowadays, the conditions of modern life, the speed with which events are happening, consumer society, problems at work, in love relationship, failures and unsuccess determine the manifestation of stress among young people. We are witnessing an increase number of young people experiencing an intense level of stress. Stress is the response to certain external and / or internal factors that may have a physical, biological or psychological nature. Stress can have negative consequences on physical and mental health. A high level of stress changes the body’s function and influence on immune system, nervous system, cardiac system and endocrine system, etc. On psychological level stress causes changes in thinking, emotions and behaviour and can produce psychological discomfort, emotional instability, neuroticism. When stress becomes chronic it affects important aspects of young people life: work, rest time and social relationships.
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LOSÎI, Elena. "Experiencing occupational stress in employment in the educational system." In Învățământul superior: tradiţii, valori, perspective. "Ion Creanga" State Pedagogical University, 2023. http://dx.doi.org/10.46727/c.29-30-09-2023.p173-184.
Анотація:
Stress has become an indispensable part of our lives. Environmental demands are constantly rising and are affecting all spheres, including work. The activity of employees in the education system is far from easy. Not everyone manages to adapt to new changes, to the challenges of reality and hence the stress that affects their quality of life and professional performance. This article reflects the results of an experimental study undertaken on 90 employees in the education system, aged between 20 – 72 years, from early education institutions, theoretical gymnasiums and high schools in urban and rural areas. According to this research, 42.2% of education system employees have a high level of stress, while 3.3% experience an intense level. Teachers from preschool and high school institutions are the ones most affected by stress, while employees in middle institutions show a lower level of occupational stress.
7
Lan, Zhang, Fan Jianchun, Zhang Laibin, and Jia Yunhang. "Wavelet energy entropy based multi-sensor data fusion for residual stress measurement using innovative intense magnetic memory method." In Instruments (ICEMI). IEEE, 2009. http://dx.doi.org/10.1109/icemi.2009.5274623.
8
Metzger, Don R., Xinjian Duan, and Mukesh Jain. "Numerical Simulation of Sample Scale Intense Shear Bands in Uniaxial Tension Test of Aluminum Alloys." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71383.
Анотація:
The present work focuses on the study of the development of shear localization through the use of the conventional finite element method which does not involve the non-associative flow rule, yield surface vertex or void growth model. The various aspects, i.e. geometry idealization, element type, solution procedure, convergence, and particularly the representation of true-stress and plastic strain relationship, are emphasized. The predicted profile of the deformed specimen, shear band angle and strain distribution show an excellent agreement with experimental observations.
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Jan, James, and Madhusudhan Nannapuraju. "CFD Investigation of Quench Media and Orientation Effects on Structural Stress Induced in the Intense Quenching Processes for Aluminum Cylinder Heads." In HT 2017. ASM International, 2017. http://dx.doi.org/10.31399/asm.cp.ht2017p0411.
Анотація:
Abstract Heat treatment is a common manufacturing process in automotive industry to produce high performance components such as cylinder heads and cylinder blocks. Although heat treatment incorporating a quenching process, either by high velocity air flow or water, can produce parts with durable mechanical properties, an unwanted effect of intense quenching processes is that they also induce thermal residual stress, which often is a leading cause for quality issues associated with high cycle fatigues. During product development cycle, it is not uncommon to switch between air and water quench media and change quench orientation in order to minimize residual stress. However, the choice of quench media and quench orientation is often determined by intuitive engineering judgement at best and trial-and-error iterative method at worst. With the advancement of CFD technologies, the temperature profile and history of quenching processes now can be accurately calculated. Since thermal residual stress is directly linked to non-uniform temperature distribution in the metal, spatial temperature gradient of each quenching process is evaluated to study and compare the performance of different quench media and configuration. The conclusion of this study can be used to establish engineering guidelines for future product development.
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Gielo Perczak, Krystyna, Riley Mcnaboe, and Hugo Posada-quintero. "Evaluation of Patient Stress During Mammograms through Surface Electromyography Analysis." In 15th International Conference on Applied Human Factors and Ergonomics (AHFE 2024). AHFE International, 2024. http://dx.doi.org/10.54941/ahfe1004842.
Анотація:
Regular mammograms are recommended for women to allow for early detection of breast cancer and in turn, proper treatment and improved prognosis of patients. However, the stress and discomfort associated with the procedure deter many women from routine screening. Most previous work attempting to characterize this pain utilizes subjective, questionnaire-based methods. The variability in methodology and subjectivity of these approaches requires a more objective strategy to fully understand mammogram related stress. Bio signals such as surface electromyography (sEMG) have been increasing in popularity as a means of quantifying various physiological states including stress and pain. This research presents the use of sEMG as a means of measuring the stress and discomfort experienced by biological females during a mammogram. N=25 healthy subjects were recruited to participate in a simulated procedure consisting of two different variations in machine design (compression paddle shape). Wearable sEMG sensors were placed on 14 different muscles and a multi-metric analysis was conducted to observe muscle activation and estimated stress between a relaxed state and the compressions of the procedure. Significantly activated muscles during the painful mammogram include the deltoid, infraspinatus, teres major, and trapezius upper fibers shown by the most responsive metrics derived. The illustration of intense activation of these muscles during the procedure along with the proposed bio signal analysis methodology can aid in advancing ongoing research and clinical efforts to make mammograms more comfortable and less stressful for patients by providing a more comprehensive understanding of the stress experienced.
Звіти організацій з теми "Stress intense":
1
Molotylnikova, Vira. MODERN TYPES OF BODY RELAXATION METHODS AFTER INTENSE PHYSICAL EXERTION. Intellectual Archive, November 2022. http://dx.doi.org/10.32370/iaj.2748.
Анотація:
The article presents varieties and variants of relaxation techniques advisable to use after intense physical exertion. The concept of "relaxation" and understanding of its role in physical education to maintain health and harmonious development of youth are considered. Considering the fact that one of the main trends in sports remains the increase in the intensity of training and the need to improve the results of competitions, the problem of restoring the athlete's performance capacity after physical exertion is extremely relevant today. Understanding the causes of fatigue and the physiological mechanisms of recovery, control over the relevant processes, the rational use of modern methods of body relaxation and means of recovery are important for assessing the impact of physical stress on the body, the effectiveness of training programs, identifying overtraining, determining the optimal rest time after physical exercises, and therefore, are necessary to improve the athlete's training and achieving high results.
2
Whelan, Sally, Gabriella Ledis, Alayna Menecola, Madie Schulte, Giavanna Semiao, Arlene Mannion, and Geraldine Leader. Exploring the resilience of adults with autism spectrum disorder: A Scoping Review protocol. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, April 2022. http://dx.doi.org/10.37766/inplasy2022.4.0049.
Анотація:
Review question / Objective: This review aims to explore resilience in the context of autistic adults. To fulfil this aim, the review has the following objectives: • To explore how adults with autism experience and perceive their resilience. • To identify how empirical research has defined and measured resilience in populations of adults with autism. • To identify how resilience in autistic adults can be understood in terms of the resilience process. • To identify factors that can support the resilience of adults with autism. Condition being studied: Autism is a lifelong neurodevelopmental condition that has core features of intense interests, affective and social interaction difficulties, and a preference for repetitive behaviours (American Psychiatric Association, 2013). Resilience has been defined as an outcome, and/or a process through which people use resources to adapt positively to adversity, stress, or trauma (Windle, 2011).
3
Wyndham, Amber, Emile Elias, Joel R. Brown, Michael A. Wilson, and Albert Rango. Drought Vulnerability Assessment to Inform Grazing Practices on Rangelands in Southeast Arizona and Southwest New Mexico’s Major Land Resource Area 41. United States. Department of Agriculture. Southwest Climate Hub, August 2018. http://dx.doi.org/10.32747/2018.6818230.ch.
Анотація:
Increased climate variability, including more frequent and intense drought, is projected for the southwestern region of the United States. Increased temperatures and reduced precipitation lower soil water availability, resulting in decreased plant productivity and altered species composition, which may affect forage quality and quantity. Reduced forage quality and increased heat stress attributable to warmer temperatures could lead to decreased livestock performance in this system, which is extensively used for livestock grazing. Mitigating the effects of increasing drought is critical to social and ecological stability in the region. Reduced stocking rates and/or a change in livestock breeds and/or grazing practices are general recommendations that could be implemented to cope with increased climatic stress. Ecological Sites (ESs) and their associated state-and-transition models (STMs) are tools to help land managers implement and evaluate responses to disturbances. The projected change in climate will vary depending upon geographic location. Vulnerability assessments and adaptation strategies are necessary at the local level to inform local management decisions and help to ameliorate the effects of climate change on rangelands. The USDA Southwest Climate Hub and the Natural Resources Conservation Service (NRCS) worked together to produce this drought vulnerability assessment at the Major Land Resource Area (MLRA) level: it is based on ESs/STMs that will help landowners and government agencies to identify and develop adaptation options for drought on rangelands. The assessment illustrates how site-specific information can be used to help minimize the effects of drought on rangelands and to support informed decision-making for selecting management adaptations within MLRA 41.
4
Wyndham, Amber, Emile Elias, Joel R. Brown, Michael A. Wilson, and Albert Rango. Drought Vulnerability Assessment to Inform Grazing Practices on Rangelands of Southeastern Colorado’s Major Land Resource Area 69. United States. Department of Agriculture. Southwest Climate Hub, January 2018. http://dx.doi.org/10.32747/2018.6876399.ch.
Анотація:
Increased climate variability, including more frequent and intense drought, is projected for the southwestern region of the United States. Increased temperatures and reduced precipitation lower soil water availability resulting in decreased plant productivity and altering species composition which may affect forage quality and quantity. Reduced forage quality and increased heat stress attributable to warmer temperatures could lead to decreased livestock performance in this system, which is extensively used for livestock grazing. Mitigating the effects of increasing drought is critical to social and ecological stability in the region. Reduced stocking rates, change in livestock breeds and/or grazing practices are general recommendations that could be implemented to cope with increased climatic stress. Ecological Sites (ESs) and their associated state and transition models (STMs) are tools to help land managers implement and evaluate responses to disturbances. The projected change in climate will vary depending on geographic location. Vulnerability assessments and adaptation strategies are needed at the local level to inform local management decisions and help ameliorate the effects of climate change on rangelands. The USDA Southwest Climate Hub and Natural Resources Conservation Service (NRCS) worked together to produce this drought vulnerability assessment at the Major Land Resource Area (MLRA) level based on ESs/STMs that will help landowners and government agencies identify and develop adaptation options for drought on rangelands. The assessment illustrates how site-specific information can be used to help minimize the effects of drought on rangelands and support informed decision-making for selecting management adaptations within MLRA 69.
5
Wyndham, Amber, Emile Elias, Joel Brown, Michael Wilson, and Albert Rango Rango. Drought Vulnerability Assessment to Inform Grazing Practices on Rangelands in Southeast Arizona and Southwest New Mexico’s Major Land Resource Area 41. USDA Southwest Climate Hub, August 2018. http://dx.doi.org/10.32747/2018.6947060.ch.
Анотація:
Increased climate variability, including more frequent and intense drought, is projected for the southwestern region of the United States. Increased temperatures and reduced precipitation lower soil water availability, resulting in decreased plant productivity and altered species composition, which may affect forage quality and quantity. Reduced forage quality and increased heat stress attributable to warmer temperatures could lead to decreased livestock performance in this system, which is extensively used for livestock grazing. Mitigating the effects of increasing drought is critical to social and ecological stability in the region. Reduced stocking rates and/or a change in livestock breeds and/or grazing
practices are general recommendations that could be implemented to cope with increased climatic stress. Ecological Sites (ESs) and their associated state-and-transition models (STMs) are tools to help land managers implement and evaluate responses to disturbances. The projected change in climate will vary depending upon geographic location. Vulnerability assessments and adaptation strategies are necessary at the local level to inform local management decisions and help to ameliorate the effects of climate change on rangelands. The USDA Southwest Climate Hub and the Natural Resources Conservation Service (NRCS) worked together to produce this drought vulnerability assessment at the
Major Land Resource Area (MLRA) level: it is based on ESs/STMs that will help landowners and government agencies to identify and develop adaptation options for drought on rangelands. The assessment illustrates how site-specific information can be used to help minimize the effects of drought on rangelands and to support informed decision-making for selecting management adaptations within MLRA 41.
6
Wyndham, Amber, Emile Elias, Joel Brown, Michael Wilson, and Albert Rango. Drought Vulnerability Assessment to Inform Grazing Practices on Rangelands of Southeastern Colorado’s Major Land Resource Area 69. USDA Southwest Climate Hub, July 2018. http://dx.doi.org/10.32747/2018.6947062.ch.
Анотація:
Increased climate variability, including more frequent and intense drought, is projected for the southwestern region of the United States. Increased temperatures and reduced precipitation lower soil water availability, resulting in decreased plant productivity and altering species composition, which may affect forage quality and quantity. Reduced forage quality and increased heat stress attributable to warmer temperatures could lead to decreased livestock performance in this system, which is extensively used for livestock grazing. Mitigating the effects of increasing drought is critical to social and ecological stability in the region. Reduced stocking rates, change in livestock breeds and/or grazing practices
are general recommendations that could be implemented to cope with increased climatic stress. Ecological Sites and their associated state–and-transition models (STMs) are tools to help land managers implement and evaluate responses to disturbances. The projected change in climate will vary depending upon geographic location. Vulnerability assessments and adaptation strategies are needed at the local level to inform local management decisions and help ameliorate the effects of climate change on rangelands. The United States Department of Agriculture (USDA) Southwest Climate Hub and Natural Resources Conservation Service (NRCS) worked together to produce this drought vulnerability
assessment at the Major Land Resource Area (MLRA) level, based on ecological sites and state-and-transition models that will help landowners and government agencies to identify and develop adaptation options for drought on rangelands. The assessment illustrates how site-specific information can be used to help minimize the effects of drought on rangelands and support informed decision-making for the selection of management adaptations within MLRA 69.
7
Wyndham, Amber, Emile Elias, Joel Brown, Michael Wilson, and Albert Rango. Drought Vulnerability Assessment to Inform Grazing Practices on Rangelands of Southeastern Colorado’s Major Land Resource Area 69. USDA Southwest Climate Hub, March 2018. http://dx.doi.org/10.32747/2018.6965584.ch.
Анотація:
Increased climate variability, including more frequent and intense drought, is projected for the southwestern region of the United States. Increased temperatures and reduced precipitation lower soil water availability resulting in decreased plant productivity and altering species composition which may affect forage quality and quantity. Reduced forage quality and increased heat stress attributable to warmer temperatures could lead to decreased livestock performance in this system, which is extensively used for livestock grazing. Mitigating the effects of increasing drought is critical to social and ecological stability in the region. Reduced stocking rates, change in livestock breeds and/or grazing practices are general recommendations that could be implemented to cope with increased climatic stress. Ecological Sites (ESs) and their associated state and transition models (STMs) are tools to help land managers implement and evaluate responses to disturbances. The projected change in climate will vary depending on geographic location. Vulnerability assessments and adaptation strategies are needed at the local level to inform local management decisions and help ameliorate the effects of climate change on rangelands. The USDA Southwest Climate Hub and Natural Resources Conservation Service (NRCS) worked together to produce this drought vulnerability assessment at the Major Land Resource Area (MLRA) level based on ESs/STMs that will help landowners and government agencies identify and develop adaptation options for drought on rangelands. The assessment illustrates how site-specific information can be used to help minimize the effects of drought on rangelands and support informed decision-making for selecting management adaptations within MLRA 69.
8
Leonid E. Zakharov. Magnetic Propulsion of Intense Lithium Streams in a Tokamak Magnetic Field. Office of Scientific and Technical Information (OSTI), March 2002. http://dx.doi.org/10.2172/796206.
9
Ronald C. Davidson, Igor Kaganovich, and Edward A. Startsev. Weibel and Two-Stream Instabilities for Intense Charged Particle Beam Propagation through Neutralizing Background Plasma. Office of Scientific and Technical Information (OSTI), April 2004. http://dx.doi.org/10.2172/827830.
10
Douglas, Gordon, and David Moore. Analyzing the Use and Impacts of Oakland Slow Streets and Potential Scalability Beyond Covid-19. Mineta Transportation Institute, July 2022. http://dx.doi.org/10.31979/mti.2021.2152.
Анотація:
This report presents the results of a mixed-methods study of the 2020-2022 Oakland Slow Streets program. An official response to the Covid-19 pandemic, the program used signs and temporary barricades to limit thru-traffic on 21 miles of city streets to create more and safer space for walking, cycling, and outdoor recreation. Researchers collected data throughout the summer of 2021 on seven designated slow streets plus one cross street and one control street for each – a total of 21 street segments representing conditions in seven different neighborhoods across Oakland. Data collection comprised in-person passerby counts, observations and photographs of local conditions, and logged traffic speed data. Findings vary widely across study sites. In certain cases, observed slow streets saw less car traffic or more bicycle/pedestrian use than one or both of their comparison streets, and in at least one case the slow street was clearly embraced by the local community and used as planners intended; in others the slow street was no different than neighboring streets. The study draws on these findings to identify local conditions that seem likely to make slow treet treatments more or less successful. However, acknowledging that all neighborhoods deserve safer streets and greater outdoor recreational opportunities, the authors argue that better community outreach must be implemented to ensure areas not predisposed to make full use of slow streets can have the opportunity to do so. The study also makes suggestions regarding the potential for rapid, low-cost bike and pedestrian street safety improvements going forward.