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Littérature scientifique sur le sujet « Process stresse »

Auteur : Grafiati

Publié le 9 mars 2023

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Articles de revues sur le sujet "Process stresse"

Ramos, Sandra, et Jorge A. Ramos. « Process of Change and Effectiveness of Family Constellations : A Mixed Methods Single Case Study on Depression ». Family Journal 27, n^o 4 (13 août 2019) : 418–28. http://dx.doi.org/10.1177/1066480719868706.

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Aims: To analyze the process of change and the effectiveness of five sessions of family constellations (FC) using mixed methods in mixed settings (videoconference and in person). To obtain variables associated with processes and results. Methods: Using an exploratory design with mixed methods, this single case study used a triangulation of data: quantitative ( Escala de Ansiedade, Depressão e Stresse-21) and qualitative (the notes from the consultations and the patient’s responses to the Psychotherapeutic Process Data Mining Questionnaire [PPDMQ]). Results: The patient’s symptoms of depression went from a level of severe to normal, and the posttest results persisted after a 3-month follow-up. The severe depression seems to have been mitigated through interventions that promoted contact with reality, self-determination, the psychoemotional establishment of systemic places, and through finding meaning in autobiographical events. Conclusions: This article may encourage further studies that use the PPDMQ to create a metasynthesis and to gauge whether the effectiveness of FC, as a systemic, intergenerational, and integrative psychotherapy, could plausibly contribute to enrich the body of scientific evidence–based psychotherapies and mitigate the global escalation of depression.

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Du, Wen Bo, Xu Dong Wang, Zhao Hui Wang et Shu Bo Li. « Nano-Crystalline Structure in Mg₂Si/Mg-2.5Er-5Zn Composite on the Route of Repeated Plastic Working Process ». Materials Science Forum 667-669 (décembre 2010) : 635–39. http://dx.doi.org/10.4028/www.scientific.net/msf.667-669.635.

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The Mg-5Zn-2.5Er matrix composite reinforced with the in-situ synthesized Mg2Si second phase particles was fabricated via repeated plastic working (RPW) process. The microstructures and the nanocrystals in the composite have been investigated using transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HREM) and energy dispersive X-ray (EDX). Great deals of nanocrystals were found in the matrix, and they were around the in-situ synthesized Mg2Si. The HREM analysis showed that the size of nanocrystals was in the range of 5-10 nm, and the difference in their crystallographic orientation was bigger than 15°. It is suggested that the formation of nanocrystals in the matrix is attributed to the RPW deformation process and to the intensive stresse fields around the in-situ synthesized Mg2Si particles, which suppress the growth of nanocrystals by forming nonequilibrium grain boundaries containing disordered dislocation networks and junction disclinations.

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Ли, Я. Ц., et Д. Х. Чжан. « Распределение локальных напряжений в волокнисто-армированных композитах с учетом термических напряжений отверждения ». Механика композитных материалов 57, n^o 5 (octobre 2021) : 959–74. http://dx.doi.org/10.22364/mkm.57.5.11.

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В силу различия коэффициентов термического расширения и эффективных модулей упругости материалов волокна и матрицы в композитах в ходе отверждения от высокой температуры изготовления до комнатной возникают концентрации локальных напряжений. Для оценки влияния остаточных термических напряжений на распределение локальных напряжений в композитах разработали высокоточную микромасштабную модель. Полученные численные результаты показали, что остаточные термические напряжения не вызывают пластические деформации в матрице.

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Hwang, Young-In, Geonwoo Kim, Yong-Il Kim, Jeong-Hak Park, Man Yong Choi et Ki-Bok Kim. « Experimental Measurement of Residual Stress Distribution in Rail Specimens Using Ultrasonic LCR Waves ». Applied Sciences 11, n^o 19 (7 octobre 2021) : 9306. http://dx.doi.org/10.3390/app11199306.

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Longitudinal critically refracted (LCR) waves are considered bulk longitudinal waves and penetrate into an effective depth beneath the surface parallel to the material surface. Such LCR waves can be employed to measure residual stresses because the acoustoelastic effect is the basis for ultrasonic residual stress measurements. This effect is described by the relationship between change of wave travel time and stress applied when such waves propagate in a stressed medium. In this paper, stresses applied in a rail were evaluated by using a developed LCR probe. With this transducer, it was verified how the difference in the arrival times of the LCR waves showed a trend as the tensile stresses increased. The acoustoelastic coefficients were calculated using the relationship between the stresses and the travel times, and the residual stresses of the used rails were measured using these coefficients. In addition, the difference in residual stress distribution according to the characteristics of the wheel-rail contact surface was analyzed from the obtained residual stress value. It was concluded that this non-destructive evaluation technique using LCR waves could be employed for accurate stress measurement of rails because differences in stress applied to the rail can be detected.

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Xie, Huibing, Bing Han, Wutong Yan et Peng Jiang. « Statistical Inversion Approach for Stress Estimation Based on Strain Monitoring in Continuously Pre-Stressed Concrete Beams ». Applied Sciences 11, n^o 21 (29 octobre 2021) : 10161. http://dx.doi.org/10.3390/app112110161.

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Stress is one of the most important physical indexes reflecting the mechanical behavior of concrete structures. In general, stress in structures cannot be directly monitored and can only be estimated through an established model of stress and strain. The accuracy of the estimated stress depends on the rationality of the established model for stress and strain. As the strain measured by sensors contains creep, shrinkage, and elastic strain, it is difficult to establish an analytical model for strain and stress. In this paper, a statistical inverse method was utilized to estimate the stress in continuously pre-stressed concrete beams based on the monitored strain. Stress in the beams and the model uncertainty factors were treated as model parameters. A linear-simplified method was adopted to determine the prior distribution of the stresses. The posterior distribution of the stresses at different locations during bridge construction can be obtained by the proposed method. A continuously pre-stressed concrete beam bridge was taken as the case study to verify the effectiveness of the proposed method. Additionally, the constitution of the total strain in the different construction stages was calculated. It was concluded that the creep strain is the dominant part of the total strain.

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LEONTYEV, V. V., et E. V. KONDRATOVA. « MODELING OF THE CONTACT LAYER IN THE STUDY OF THE STEEL WIRE DRAWING PROCESS ». Fundamental and Applied Problems of Engineering and Technology, n^o 4 (2021) : 113–17. http://dx.doi.org/10.33979/2073-7408-2021-348-4-113-117.

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Using the COMSOL MULTIPHYSICS software, the problem of the stress-strain state of a steel wire during drawing is solved by the finite element method. A special contact layer is introduced to describe the contact between the wire and the matrix. It consists of a material whose modulus of longitudinal elasticity in the direction perpendicular to the contacting parts coincides with the modulus of longitudinal elasticity of the matrix or wire, and in the other direction is small, as is the shear modulus. During the calculation, the fields of radial stresses, axial stresses and equivalent stresses are obtained. The results of solving the problem allow us to proceed to the study of residual stresses after drawing, as well as to study the influence of various drawing parameters on the stressed state of the wire.

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Grbović, Aleksandar, Aleksandar Sedmak, Abdulgasem Sghayer et Katarina Čolić. « Assessment of the integrity and life of welded panel using local stresses ». Zavarivanje i zavarene konstrukcije 67, n^o 1 (2022) : 11–19. http://dx.doi.org/10.5937/zzk2201011g.

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Relevant local characteristics of fatigue loading are the largest stress amplitudes in the related mean stress values. They should be determined for the whole components. The relevant material properties are then compared with the stresses to assess integrity and life of a panel, made of Al allow, with welded stringers. To determine the maximum stresses the Finite Element Method was used.

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Kuo, M. K., et H. T. Lee. « Inversion of Residual Stress ». Journal of Mechanics 17, n^o 2 (juin 2001) : 103–8. http://dx.doi.org/10.1017/s1727719100003178.

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ABSTRACTA technique for inverting residual stress based on a theory of acoustoelasticity is presented. A general incremental constitutive relation is first derived for a pre-stressed material subjected to an additional infinitesimal elastic deformation. The theory is then employed on using ultrasonic means to evaluate residual stresses of residually stressed materials. The residual stresses are assumed to be homogeneous in materials as usual. The only major assumption in this formulation is that the additional deformations caused by ultrasonic evaluating process are infinitesimal and elastic. No assumption on the origin of residual stresses is needed, nor the assumption on the possible existence of “natural state” of the materials. Successful inversion of residual stresses are demonstrated through a preliminary numerical experiment.

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Zhichao Jia, Zhichao Jia, Tingzhong Zhang Tingzhong Zhang, Huazhong Zhu Huazhong Zhu, Zewen Li Zewen Li, Zhonghua Shen Zhonghua Shen, Jian Lu Jian Lu et Xiaowu Ni Xiaowu Ni. « Stress damage process of silicon wafer under millisecond laser irradiation ». Chinese Optics Letters 16, n^o 1 (2018) : 011404. http://dx.doi.org/10.3788/col201816.011404.

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Stone, B. M., I. J. Jordaan, J. Xiao et S. J. Jones. « Experiments on the damage process in ice under compressive states of stress ». Journal of Glaciology 43, n^o 143 (1997) : 11–25. http://dx.doi.org/10.3189/s002214300000277x.

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AbstractDuring ice-structure interaction, ice will fail in a brittle manner dominated by two processes. The first corresponds to the formation of macrocracks and the consequent spalling-off of large ice pieces. The second includes an intense shear-damage process in zones, termed critical zones, where high pressures are transmitted to the structure. The shear-damage process results in microstructural changes including microcrack formation and recrystallization. A range of tests on laboratory-prepared granular ice have been conducted to determine the fundamental behaviour of ice under various stress states and stress history, particularly as it relates to changes in microstructure. The test series was designed to study three aspects: the intrinsic creep properties of intact, undamaged ice; the enhancement of creep and changes in microstructure due to damage; and the effects of different stress paths. Tests on intact ice with triaxial confining pressures and low deviatoric stresses, aimed at defining the intrinsic creep response in the absence of microcracking, showed that an accelerated creep rate occurred at relatively low deviatoric stresses. Hence, a minimum Creep rate occurred under these conditions. Recrystallization to a smaller grain-size and void formation were observed. Ice damaged uniaxially and triaxially prior to testing showed enhancement of creep under both uniaxial and triaxial loading conditions Creep rates in triaxially damaged ice were found to be non-linear with high deviatoric stresses, corresponding to a power-law dependence of creep rate. Uniaxially damaged specimens contained microcracks parallel to the stressed direction which tended to close under triaxial confinement. Damage under triaxial conditions at low confining pressures produced small recrystallized grains near zones of microcracking. At high confining pressures, a fine-grained recrystallized structure with no apparent cracking was observed uniformly across the specimen. The recrystallization process contributes significantly to the enhanced creep rates found in damaged specimens.

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Thèses sur le sujet "Process stresse"

Blyžienė, Alevtina. « Mokytojų stresas ir jo valdymo metodų reikšmė ugdymo procesui ». Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080904_110456-98414.

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Tyrimo aktualumas. Ne tik Lietuvoje, bet ir kitose šalyse mokytojo profesija netenka prestižo dėl didelės įpareigojančios etinės atsakomybės, informacinio ir fizinio krūvio, socialinių vaidmenų konfliktų, kurie sukelia išsekimą ir profesinį „perdegimą“. Anksčiau atliktuose tyrimuose mokytojų streso valdymo metodai nebuvo nagrinėjami. Tyrimo problema. Mokytojai dėl savo darbo specifikos nuolat patiria psichinį, fizinį, emocinį stresą, kuris daro įtaką ugdymo proceso kokybei. Tyrimo objektas. Mokytojų streso valdymo metodai. DARBO TIKSLAS. Atlikti mokytojų streso ir jo valdymo metodų analizę. UŽDAVINIAI 1. Apibūdinti streso sąvoką pedagogikoje . 2. Įvardinti mokytojų streso įtaka ugdymo procesui 3. Numatyti mokytojų streso valdymo galimybes. 4. Empiriškai ištirti mokytojų stresą ir jo valdymo metodus. Tyrimo klausimas. Ar mokytojai naudoja streso valdymo metodus savo darbe. Teorinis darbo pagrindimas. Teorinėje darbo dalyje aptariami mokytojo profesijos ypatumai, mokytojo streso įtaka ugdymo kokybei, mokyklos baimių fenomenas, streso šaltiniai mokytojo darbe, pateikiami mokslinėje literatūroje rekomenduojami mokytojų streso valdymo metodai ir pabrėžiamas mokyklos streso valdymo kompleksinio sprendimo būtinumas. Tyrimo radiniai. Empirinio kiekybinio tyrimo rezultatai parodė, kad mokytojai savo veikloje dažniausiai naudoja veiklos planavimo metodus. Tyrimo metu nustatyta streso požymių dažnumo ir streso valdymo metodų koreliacija. Kokybinio stebėjimo metodo metu gauti duomenys... [toliau žr. visą tekstą]
Topicality of the study. Not only in Lithuania, but in other countries as well, the teachers job is losing it's prestige because of extremely coercive ethical responsibility, informational and physical load, conflicts in social roles, which result in exhaustion and professional „burn out“. The control methods of the stress of the teachers have not been studied previously. The problem of the study. Because of the specifics of their job, teachers are constantly under mental, physical and emotional stress, which is affecting not only their health and social life, but also their students and the general quality of the process of education. The object of the study. Control methods of teacher's stress. PURPOSE OF THE STUDY. Make an analysis of the teachers' stress and its control methods. GOALS 1. Define “stress” in pedagogy 2. Define the effects of teachers' stress on the process of education 3. Present the options for teachers' stress control 4. Empirically study the teachers' stress and its control methods The question of the study. Are teachers using stress control methods in their work? Theoretical background. Theoretical part of this work discusses the specifics of the teacher's profession, the effects of their stress on the quality of the education process, the phenomenon of school fears, the sources of stress in teacher's job, the methods of stress control for teachers, recommended in scientific literature and emphasises the need for the complex control of stress in the... [to full text]

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BERTAGNOLI, STEFANO. « Improving robustness and metabolic profile of saccharomyces cerevisiae for industrial bioprocesses ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28926.

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The fossil energy resources decrease and climate changes, caused by carbon dioxide (CO2) emissions, have led most industrialized countries to undertake policies aimed at the development and use of renewable energy sources. Among the renewable energies, vegetal biomasses play a key role because widely available and potentially able to cover up to 200% of the global energy demand. Vegetal biomasses can be used mainly as raw materials for the production of chemicals, biofuels and energy, in the increasingly important green economy concept based on biorefineries creation. Although the vegetal biomasses result widely available, rising costs of food raw material such as wheat, corn and sugar beet have raised a serious ethical problem using these resources. To avoid the use of such raw materials, the exploitation of lignocellulosic biomasses plays a fundamental role in the industry. However, for an efficient utilization of lignocellulosic biomasses, new technologies are required in order to transform the starting biomass into simple molecules, such as pentoses and hexoses sugars, more easily to use by the microrganism, which will have the task of producing both fine chemicals and bulk chemicals in an economically and environmentally sustainable processes. In this regard, industrial biotechnologies should be able to develop new microrganisms capable to face the harsh environmental conditions that occur during an industrial production process. For many of these productions the yeast Saccharomyces cerevisiae is largely used, not only because of its naturally ability to produce large ethanol amount, but also is widely known both at genetic and metabolic level, outlining a good starting point for the development of producers strains with high tolerance against different stresses occur during an industrial process. This is the view adopted by NEMO project (Novel high performance Enzymes and Microrganisms for conversion of lignocellulosic biomass to ethanol), belonging to the European Union seventh framework program, where it become of primary importance the development of microrganisms, especially S.cerevisiae, for the second generation ethanol production. Microrganisms must be, on the one hand able to efficiently utilize all the sugars released from lignocellulosic biomass pre-treatment, on the other hand should be more tolerant against process conditons, such as inhibitory compounds and environmental stresses. A point of relevant importance is the ability to utilize pentose sugars, like D-xylose, released in large amount after lignocellulose pre-treatment. Currently, worldwide researches are focused on the development of yeast strains engineered with xylose degradation pathways involving the pentose phosphate pathway. In fact the fungal pathway exploits xylose reductase and the xylitol dehydrogenase while the bacterial pathway exploits xylose isomerase; both pathways degrade D-xylose into D-xylulose, which will enter into pentose phosphate pathway. In addition to these two pathways studied since the ‘80s of the last century, there also two other poorly known metabolisms, described for the first time in the ‘70s, which produce alpha-ketoglutarate or pyruvate and glycolaldehyde through an oxidative xylose degradation. These pathways are composed of 5 enzymatic reactions by the Weimberg’s pathway and of 4 enzymatic reactions by the Dahms’ pathway, however they share the first 3 enzymatic reactions. After bioinformatics we were identified the presence of Weimberg’s pathway into Burkholderia xenovorans, while the reaction that characterizes the Dahms’ pathway has been identified in Escherichia coli. The encoding genes for these enzymatic activities were expressed in S.cerevisiae, and the capacity to grow on D-xylose as carbon source are evaluated. The reconstruction of these two pathways showed a poorly growth capacity on xylose. Such growth limitation seems to be related to several factors: the presence of bottlenecks associated to enzymes functionality, like D-xylonate dehydratase activity; the yeast ability to internalize xylose efficiently; the involved genes optimization. Another important aspect is the yeast ability to face and overcome environmental stresses encountered during an industrial process. The cytoplasmic membrane plays a key role in cellular homeostasis, being at the interface between the cell and the external environment, and reacting at environmental changes. The plant membrane protein TIL gives particular strength to the yeast cells when these are subjected to environmental stresses of industrial relevance, such as the presence of oxidative agents or during temperature changes. However, when TIL is expressed in an industrial and/or in an engineered laboratory strains, for industrial use, the protective effect against prolonged stress exposure and process conditions disappear. Finally, a further important aspect during an industrial process is the S.cerevisiae ability to tolerate the growth inhibitory compounds presence into pre-treated lignocellulose. In fact has been largely described how chemical compounds like aldehydes, organic acids and phenolic compounds, released during lignocellulose pre-treatment process, are toxic at certain concentration, inhibiting S.cerevisiae growth or causing yeast death. The growth performance of different wild type or engineered yeast strains are evaluated on spruce and giant cane lignocellulose pre-treated: in addition the same strains were tested on minimal formulated medium according to the spruce pre-treated composition. The results showed that the combination of low pH and the presence of organic acids, especially acetic acid and formic acid, are dramatically harmful for growth of both industrial strain, naturally more tolerant, and engineered strain, for the production and recycle of L-ascorbic acid. However, the behavior of engineered strain for production and recycle of L-ascorbic acid is interesting at low pH, because showed higher tolerance than other strains in terms of growth rate and ethanol production and productivity. Despite the positive results obtained by engineering microrganisms, especially S.cerevisiae, in laboratory, their industrial uses still remain limited. Therefore, appears extremely important the construction of more robustness strains, able to withstand different environmental conditions along an entire industrial process, with consequent influence on yields, production and productivity. For these reasons, the research is aimed to combine these aspects to provide the best microrganism possible to industry productions.

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Wang, Gongbing 1944. « Size effect on damage in progressive softening process for simulated rock ». Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276886.

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In the hierarchical approach of constitutive modelling, the damage accumulation and resulting strain-softening behavior of geologic materials can be modelled by introducing a concept of damage evaluation. The damage accumulation and softening behavior are affected by the size of specimens. A series of uniaxial tests on cylindrical specimens of a simulated rock were performed. The effect of specimen size on the parameters of the damage model were investigated by using the test results. The empirical results show that the damage parameters can be related to a characteristic dimension, which was expressed in terms of length and diameter of the specimen.

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Ana, Genc. « Relacije između stres-procesa i ispitne anksioznosti – distorzije u sećanjima na emocije iz prošlih stresnih transakcija ». Phd thesis, Univerzitet u Novom Sadu, Filozofski fakultet u Novom Sadu, 2014. http://www.cris.uns.ac.rs/record.jsf?recordId=90694&source=NDLTD&language=en.

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Disertacija je usmerena na dva glavna istraživačka pitanja: na ispitivanjesloženih međuodnosa varijabli relevantnih za fenomen stres-procesa u kontekstuispitne anksioznosti i na istraživanje grešaka u sećanjima na emocije, misli iponašanja iz konkretne prošle stresne transakcije. Teorijsku bazu rada predstavlja uovoj studiji revidirana verzija modela Tejlora i Aspinvala (The Taylor and AspinwallModel, 1996), koji podrazumeva sveobuhvatan i savremen konceptualni okvir zarazumevanje komponenti generičkog pojma stresa i njihovih međusobnih relacija.Ovde validirani model obuhvata četiri grupe promenljivih: a) stresor (ispitnaanksioznost), b) suočavanje sa stresom (tri kategorije mehanizama prevladavanja:suočavanje usmereno na zadatak, suočavanje usmereno na emocije i izbegavanje), c)karakteristike ličnosti (optimizam i generalna samoefikasnost kao internalni resursi zasuočavanje sa stresom, i dve stabilne osobine ličnosti, relevantne za domenakademskog života: perfekcionizam i neuroticizam), i d) izlazne varijable stresprocesa(uspeh postignut na kolokvijumu i emocionalno stanje studenata neposrednonakon ispitne situacije).Istraživanje je sprovedeno na prigodnom uzorku od ukupno 263 studenata,koji pohađaju studije psihologije i germanistike na Filozofskom fakultetu u NovomSadu. Nacrt istraživanja koncipiran je na način, koji je omogućio prikupljanjepodataka u dva distinktivna vremena merenja: neposredno pre i odmah nakonpolaganja kolokvijuma, te mesec dana posle ove ispitne situacije. Ispitivanje prostoravarijabli stres-procesa obavljeno je primenom sledećih mernih instrumenata: upitnikza procenu ispitne anksioznosti (TAI), inventar za registrovanje načina suočavanja sakognitivnim zadacima (CITS), upitnik za merenje perfekcionizma (APS-R), skaladispozicionog optimizma (LOT-R), skala generalne samoefikasnosti (GSE), subskalaneuroticizma iz „Big Five” inventara ličnosti i upitnik za procenu pozitivnog inegativnog afektiviteta (SIAB-PANAS).Dobijeni rezultati, koji su proizišli iz razmatranja prve grupe istraživačkihpitanja, sugerišu da mehanizmi suočavanja usmereni na emocije predstavljajustatistički značajne medijatore relacija, koje postoje između visine izraženosti ispitneanksioznosti, s jedne strane, i uspeha na kolokvijumu i emocionalnog stanja ispitanikaneposredno nakon ispitne situacije, s druge strane. Nadalje, u radu su detaljnoprikazani i prodiskutovani specifični uslovi, pod kojima određeni nivo razvijenosti ispitivanih moderator varijabli (optimizam, generalna samoefikasnost, neuroticizam itri podvrste perfekcionizma) značajno menja sledeće relacije: a) ispitna anksioznost –izbor strategija za suočavanje, b) primenjeni mehanizmi prevladavanja – ishodiispitivane stresne transakcije i c) direktna veza između stresora i izlaznih varijabli.Prilikom ispitivanja memorijskih distorzija, ustanovljeno je da su studentigeneralno skloni naknadnom potcenjivanju jačine sopstvene ispitne anksioznosti, kojaje postojala u realnoj situaciji polaganja kolokvijuma, kao i precenjivanju pozitivnihishodnih emocija. Nalazi takođe sugerišu da osobina neuroticizma i uspeh postignutna testu znanja nisu u značajnoj meri delovali na greške u sećanju na osećanja izprošle stresne transakcije. Na posletku, utvrđeno je da su ispitanici relativno tačnoevocirali sećanja na primenjene strategije suočavanja, koje spadaju u kategorijeprevladavanja usmerenog na zadatak i izbegavanje, dok su potcenili jačinu i učestalostkorišćenja mehanizama suočavanja usmerenih na emocije.
The thesis is focused on two main research issues, as follows: examination ofcomplex interrelationships among variables relevant to the phenomenon of the stressprocessin the context of test anxiety and study of distortions in the memory foremotions, thoughts and behavior in a particular previous stressful transaction. Thetheoretical basis of the thesis presented in this study is a revised version of the Taylorand Aspinwall model (The Taylor and Aspinwall Model, 1996), which includes acomprehensive and contemporary conceptual framework for understanding thecomponents of a generic phenomenon of the stress concept and their mutual relations.The validated model includes four sets of variables: a) stressor (test anxiety), b)coping (three categories of coping mechanisms: task-focused coping, emotion-focusedcoping, and avoidance), c) personality traits (optimism and general self-efficacy asinternal resources for coping, and two stable personality traits relevant to the domainof academic life: perfectionism and neuroticism), and d) the output variables of thestress-process (success achieved at the colloquium and the emotional state of studentsimmediately after the test situation).The research was carried out on a sample of 263 students of Psychologystudies and German Language and Literature studies at the University of Novi Sad.The research design enabled data collection within two distinct times of measurement:immediately before and immediately after passing the colloquium (test), and a monthafter the test situation. Examination of the stress-process variable space was carriedout by application of the following measuring instruments: Test Anxiety Inventory(TAI), Coping Inventory for Task Stress (CITS), The Almost Perfect Scale-Revised(APS-R), Life Orientation Test-Revised (LOT-R), General Self-Efficacy Scale (GSE),the neuroticism subscale from the "Big Five" personality inventory, and the Serbianadaptation of the Positive and Negative Affect Schedule (SIAB-PANAS).The obtained results, which have emerged after reviewing the first set of theresearch questions, suggest that emotion-focused coping mechanisms are significantmediators of relations, which exist between the intensity of the test anxiety on onehand, and success achieved at the colloquium and the emotional state of subjectsimmediately after the test situation, on the other hand. Furthermore, the thesis presentsin details and discusses specific conditions under which a certain level of theexamined moderator variables (optimism, general self-efficacy, neuroticism, and three subtypes of perfectionism) significantly change the following relations: a) test anxiety– a choice of coping strategies, b) applied coping mechanisms - outcomes of theexamined stressful transaction and c) a direct relationship between stressors andoutput variables.When examining memory distortions, it was found that students generallytended to subsequently underestimate the strength of their own test anxiety, whichexisted in the real situation of taking the test, as well as to overestimate positiveoutcome emotions. The findings also suggested that the neuroticism trait and thesuccess achieved on the test were statistically not significant for distortions inmemory, and feelings from the previous stressful transaction. Finally, it was foundthat the subjects relatively accurately evoked memories of the applied copingstrategies, which fell into the category of the task-focused coping and avoidance, andunderestimated the strength and frequency of application of emotion-focused copingmechanisms.

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Zelenka, Stefan. « Stress-related problems in process simulation / ». Zürich, 2001. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14220.

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Hanna, Carl Robert. « Engineering Residual Stress into the Workpiece through the Design of Machining Process Parameters ». Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19813.

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The surface integrity of a machined component that meets the demands of a specific application requirement is defined by several characteristics. The residual stress profile into the component is often considered as the critical characteristics as it carries a direct effect on the fatigue life of a machined component. A significant amount of effort has been dedicated by researchers to predict post process stress in a workpiece using analytical, experimental, and numerical modeling methods. Nonetheless, no methodology is available that can express the cutting process parameters and tool geometry parameters as functions of machined residual stress profile to allow process planning in achieving desired residual stress profile. This research seeks to fill that void by developing a novel approach to enable the extraction of cutting process and tool geometry parameters from a desired or required residual stress profile. More specifically, the model consists in determining the depth of cut, the tool edge radius and the cutting forces needed to obtain a prescribed residual stress profile for an orthogonal machining operation. The model is based on the inverse solution of a physics-based modeling approach of the orthogonal machining operation and the inverse solution of the residual stress prediction from Hertzian stresses. Experimental and modeling data are used to validate the developed model. The work constitutes a novel approach in engineering residual stress in a machined component.

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Wani, Nitin Yashwant. « Simulation of thermal stresses in vacuum arc remelting process ». Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1178820121.

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Proudian, Joanne. « Simulating Residual Stress in Machining ; from Post Process Measurement to Pre-Process Predictions ». Thesis, KTH, Industriell produktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103003.

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Metal cutting is a widely used manufacturing technique in the industry and has been the focus of many research and studies in both academic and industrial fields. Prediction of induced residual stresses in a machined component is essential in a component’s fatigue life and surface integrity approximation. Furthermore, it plays a significant role in optimizing cutting process conditions as well as cutting tool geometries. Research has found that using experimental techniques in measuring residual stresses in a machined component is both time consuming and expensive as a method. In the attempt of eliminating the post process measuring drawbacks, the finite element modeling and simulation has proven its efficiency, as a tool, in predicting mechanical and thermal variables, hence, providing a pre-process prediction of variables which may prevent future component failures. This thesis uses the finite element method to study, model and simulate orthogonal metal cutting using the commercial software DEFORM. Orthogonal cutting simulations of 20NiCrMo5 steel are performed and simulation results are validated against experimental data. The influence of the feed rate, cutting speed and rake angle variations on the induced residual stress are investigated and analyzed. Simulation results offer an insight into cutting parameters and tool geometry influence on the induced residual stresses. Based on the simulation results, cutting speed and rake angle showed a trend when varying the parameters on the induced residual stress; however more investigation is needed in determining a trend for the feed rate influence.

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Donovan, Christie. « Exploring the stress process in the university context ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0006/MQ34883.pdf.

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Serido, Joyce. « Appraisal and interpersonal stressors : Untangling the stress process ». Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280448.

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To understand variations in the stress response, two separate research traditions have developed: one that focuses on appraisal and the other on stressors. Research on stressors informs our understanding of the social conditions that expose individuals to potentially stressful situations, whereas research on appraisal informs our understanding of why different people respond to stressors in different ways. The present study seeks to integrate findings from these two research traditions and extend our understanding of the stress process by investigating the possibility those variations in sources of stress trigger different appraisals. In addition, this study also attempts to untangle the separate effects of appraisal and stressor by examining each construct at a more granular level than has previously been undertaken. Finally, this study examines the relationships between stressors and appraisal to understand how they may, in combination, influence distress. The data for these analyses are merged from the National Survey of Midlife Development in the United States (MIDUS) and the National Study of Daily Experiences (NSDE). The MIDUS participants are a representative sample of 3032 adults aged 25 to 74 obtained through a random-digit dialing process. The NSDE participants are a subsample of 1031 participants from the MIDUS. The participants for the present study are the 534 men and women who participated in the NSDE who experienced at least one interpersonal tension during the 8-day telephone diary. Results from multilevel modeling analyses indicated that there was more within-person variability in appraisal of interpersonal tensions than between-person variability. Findings from this study also provide empirical support that stressors and appraisal are separate constructs with independent effects on distress. Further, there are multiple pathways through which dimensions of appraisal and attributes of the stressor in combination influence distress.

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Livres sur le sujet "Process stresse"

L, Cooper Cary, et Payne Roy, dir. Personality and stress : Individual differences in the stress process. Chichester : Wiley, 1991.

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Zelenka, Stefan. Stress-related problems in process simulation. Konstanz : Hartung-Gorre, 2001.

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Poljsak, Borut. Decreasing oxidative stress and retarding the aging process. Hauppauge, N.Y : Nova Science Publishers, 2010.

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Ribeiro, Herval Pina. O juiz sem a toga : Um estudo da percepção dos juízes sobre trabalho, saúde e democracia no judiciário. Santa Catarina : SINJUSC, Sindicato dos Servidores do Poder Judiciário do Estado de Santa Catarina, 2005.

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Conference, on Residual Stress-in Design Process and Materials Selection (1987 Cincinnati Ohio). Residual stress in design, process, and materials selection : Proceedings of ASM's Conference on Residual Stress-- in Design, Process, and Materials Selection : Cincinnati, Ohio, USA, 27-29 April 1987. [Metals Park, Ohio] : ASM International, 1987.

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Murphy, David, et Joseph Stephen. Trauma and the therapeutic relationship : Approaches to process and practice. Basingstoke, Hampshire : Palgrave Macmillan, 2013.

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Avison, William R., Carol S. Aneshensel, Scott Schieman et Blair Wheaton, dir. Advances in the Conceptualization of the Stress Process. New York, NY : Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-1021-9.

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Conscious success : The 5-step process to dissolve stress, increase productivity and find your flow at work. [Boston?] : Conscious Success, LLC, 2012.

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Adams, Gerry. Adams stresses need for "credible and viable peace process". [Belfast] : Sinn Féin, 1996.

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K, Dixon Robert, dir. Process modeling of forest growth responses to environmental stress. Portland, Or : Timber Press, 1990.

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Chapitres de livres sur le sujet "Process stresse"

Cockerham, William C. « The Stress Process ». Dans Sociological Theories of Health and Illness, 172–93. New York, NY : Routledge, 2020. : Routledge, 2020. http://dx.doi.org/10.4324/9781003046165-8.

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Peterson, Kirtland C., Maurice F. Prout et Robert A. Schwarz. « The Assessment Process ». Dans Post-Traumatic Stress Disorder, 107–39. Boston, MA : Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-0756-1_7.

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Nawab, Yasir, Khubab Shaker et Abdelghani Saouab. « Process Induced Residual Stresses ». Dans Natural Fibers to Composites, 95–107. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-20597-2_5.

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Pearlin, Leonard I. « The Stress Process Revisited ». Dans Handbooks of Sociology and Social Research, 395–415. Boston, MA : Springer US, 1999. http://dx.doi.org/10.1007/0-387-36223-1_19.

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Turner, R. Jay, et Patricia Roszell. « Psychosocial Resources and the Stress Process ». Dans Stress and Mental Health, 179–210. Boston, MA : Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1106-3_7.

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Evans, R. J., et T. S. Jones. « Minimizing Process Induced Prooxidant Stresses ». Dans Advances in Experimental Medicine and Biology, 189–99. Boston, MA : Springer US, 1998. http://dx.doi.org/10.1007/978-1-4899-1925-0_16.

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Dienstbier, Richard A. « Toughness : An Opponent Process ». Dans Building Resistance to Stress and Aging, 11–21. London : Palgrave Macmillan UK, 2015. http://dx.doi.org/10.1057/9781137454850_2.

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Dressler, William W. « Culture and the Stress Process ». Dans A Companion to Medical Anthropology, 117–34. Oxford, UK : Wiley-Blackwell, 2011. http://dx.doi.org/10.1002/9781444395303.ch6.

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Fraser, J. Scott. « Posttraumatic stress disorder. » Dans Unifying effective psychotherapies : Tracing the process of change., 169–90. Washington : American Psychological Association, 2018. http://dx.doi.org/10.1037/0000078-009.

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Balitsky, K. P., Yu P. Shmalko et V. G. Pinchuk. « Stress, Cancer : Stress Modulation of the Metastatic Process ». Dans Cancer, Stress, and Death, 113–32. Boston, MA : Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-9573-8_10.

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Actes de conférences sur le sujet "Process stresse"

« Modelling the Welding Process of an Orthotropic Steel Deck ». Dans Residual Stresses 2018. Materials Research Forum LLC, 2018. http://dx.doi.org/10.21741/9781945291890-38.

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« Quasi-static Process Modelling of Deep Cold Rolling on Ti-6Al-4V ». Dans Residual Stresses 10. Materials Research Forum LLC, 2016. http://dx.doi.org/10.21741/9781945291173-2.

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« Evaluation of Residual Stress in the Hot Forming Process Using Hole Drilling ». Dans Residual Stresses 10. Materials Research Forum LLC, 2016. http://dx.doi.org/10.21741/9781945291173-21.

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« Comparison of Submerged Arc Welding Process Modification Influence on Thermal Strain by in-situ Neutron Diffraction ». Dans Residual Stresses 10. Materials Research Forum LLC, 2016. http://dx.doi.org/10.21741/9781945291173-90.

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« In situ X-Ray Diffraction Investigation of Surface Modifications in a Deep Rolling Process under Static Condition ». Dans Residual Stresses 10. Materials Research Forum LLC, 2016. http://dx.doi.org/10.21741/9781945291173-73.

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Miyake, T., H. Petek, K. Takeda et K. Hinode. « Effects of atomic hydrogen on Cu reflow process ». Dans STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54664.

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« Evaluation of In-Process Laser Heat Treatment on the Stress Conditions in Laser Metal Deposited Stellite® 21 ». Dans Residual Stresses 2018. Materials Research Forum LLC, 2018. http://dx.doi.org/10.21741/9781945291890-42.

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Clayton, Derik, et Julie Stuckey. « HASS Rapid Change-Over Process ». Dans 2016 IEEE Accelerated Stress Testing & Reliability Conference (ASTR). IEEE, 2016. http://dx.doi.org/10.1109/astr.2016.7762268.

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Fiori, V. « Thermo-Mechanical Modeling of Process Induced Stress : Layout Effect on Stress Voiding Phenomena ». Dans STRESS-INDUCED PHENOMENA IN METALLIZATION : Eighth International Workshop on Stress-Induced Phenomena in Metallization. AIP, 2006. http://dx.doi.org/10.1063/1.2173557.

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Nakanishi, Masatake, et Eizo Kinoshita. « Inter-Viewpoint Stress Methods and Group Decision Making Stress Method ». Dans The International Symposium on the Analytic Hierarchy Process. Creative Decisions Foundation, 1999. http://dx.doi.org/10.13033/isahp.y1999.046.

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Rapports d'organisations sur le sujet "Process stresse"

Dubon, Jr., Oscar Danilo. Electronic processes in uniaxially stressed p-type germanium. Office of Scientific and Technical Information (OSTI), février 1996. http://dx.doi.org/10.2172/212680.

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Everett, Richard L. Volume IV : restoration of stressed sites and processes. Portland, OR : U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1994. http://dx.doi.org/10.2737/pnw-gtr-330.

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Pochiraju, Kishore V. Multi-Physics Modeling and Simulation of Process-Induced Stresses in Polymer-Matrix Composites. Fort Belvoir, VA : Defense Technical Information Center, juin 2002. http://dx.doi.org/10.21236/ada418111.

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Amir, Rachel, David J. Oliver, Gad Galili et Jacline V. Shanks. The Role of Cysteine Partitioning into Glutathione and Methionine Synthesis During Normal and Stress Conditions. United States Department of Agriculture, janvier 2013. http://dx.doi.org/10.32747/2013.7699850.bard.

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The objective of this research is to study the nature of the competition for cysteine (Cys), the first organic sulfur-containing compound, between its two main metabolites, glutathione (GSH) and methionine (Met). GSH plays a central role in protecting plants during various stresses, while Met, an essential amino acid, regulates essential processes and metabolites in plant cells through its metabolite S-adenosyl-Met. Our results, which are based on flux analysis and measurements of Met- metabolites, show that the flux towards Met synthesis is high during non-stress conditions, however the flux is significantly reduced under stress conditions, when there is high synthesis of GSH. Under oxidative stress the expression level of the regulatory enzyme of Met synthesis, cystathionine g-synthase (CGS) was reduced. By using three different systems, we have found that that GSH down regulates the expression level of CGS, thus reducing Met synthesis. We have found that this regulation occurs at the post-transcriptional level, and further studies have shown that it occurs at post-translationaly. To reveal how oxidative stress affects the flux towards Met and GSH, flux analysis was performed. We have found that the level of Met is significantly reduced, while the level of glutathione significantly increases during stress. Under stress conditions most of the glutathione is converted from GSH to GSSG (the oxidised form of glutathione). These results suggest that under normal growth conditions, Cys is channelled towards both pathways to support GSH accumulation and the synthesis of growth-essential Met metabolites. However, during oxidative stress, when a high level of GSH is required to protect the plants, the levels of GSH increase while those of CGS are reduced. This reduction leaves more Cys available for GSH synthesis under stress conditions. In addition we have also studied the effects of high GSH level on the transcriptome profile. The analysis revealed that GSH affects the expression level of many major genes coding to enzymes or proteins associated with photosynthesis, starch degradation, hormone metabolism (especially genes associated with jasmonate), biotic stress (especially genes associated with PR-proteins), cytochrome P450 genes, regulation of transcription and signaling (especially genes associated with receptor kinases and calcium). These results suggest that indeed GSH levels affect different pathways and metabolites in plants.

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Kistler, B. L. Finite element analyses of tool stresses in metal cutting processes. Office of Scientific and Technical Information (OSTI), janvier 1997. http://dx.doi.org/10.2172/477614.

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Beers, Jeffry. Teacher Stress and Coping : Does the Process Differ According to Years of Teaching Experience ? Portland State University Library, janvier 2000. http://dx.doi.org/10.15760/etd.809.

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Ginzberg, Idit, et Walter De Jong. Molecular genetic and anatomical characterization of potato tuber skin appearance. United States Department of Agriculture, septembre 2008. http://dx.doi.org/10.32747/2008.7587733.bard.

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Potato (Solanum tuberosum L.) skin is composed of suberized phellem cells, the outer component of the tuber periderm. The focus of the proposed research was to apply genomic approaches to identify genes that control tuber skin appearance - smooth and shiny skin is highly preferred by the customers while russeted/netted skin potatoes are rejected. The breeding program (at Cornell University) seeks to develop smooth-skin varieties but has encountered frequent difficulties as inheritance of russeting involves complementary action by independently segregating genes, where a dominant allele at each locus is required for any degree of skin russeting. On the other hand, smooth-skin varieties frequently develop unsightly russeting in response to stress conditions, mainly high soil temperatures. Breeding programs in Israel aimed towards the improvement of heat tolerant varieties include skin quality as one of the desired characteristics. At the initiation of the present project it was unclear whether heat induced russeting and genetically inherited russeting share the same genes and biosynthesis pathways. Nevertheless, it has been suggested that russeting might result from increased periderm thickness, from strong cohesion between peridermal cells that prevents the outer layers from sloughing off, or from altered suberization processes in the skin. Hence, the original objectives were to conduct anatomical study of russet skin development, to isolate skin and russeting specific genes, to map the loci that determine the russet trait, and to compare with map locations the candidate russet specific genes, as well as to identify marker alleles that associated with russet loci. Anatomical studies suggested that russet may evolve from cracking at the outer layers of the skin, probably when skin development doesn’t meet the tuber expansion rate. Twodimensional gel electrophoresis and transcript profiling (cDNA chip, potato functional genomic project) indicated that in comparison to the parenchyma tissue, the skin is enriched with proteins/genes that are involved in the plant's responses to biotic and abiotic stresses and further expand the concept of the skin as a protective tissue containing an array of plantdefense components. The proteomes of skin from heat stressed tubers and native skin didn’t differ significantly, while transcript profiling indicated heat-related increase in three major functional groups: transcription factors, stress response and protein degradation. Exceptional was ACC synthase isogene with 4.6 fold increased level in the heat stressed skin. Russeting was mapped to two loci: rusB on chromosome 4 and rusC on chromosome 11; both required for russeting. No evidence was found for a third locus rusA that was previously proposed to be required for russeting. In an effort to find a link between the russeting character and the heat-induced russeting an attempt was made to map five genes that were found in the microarray experiment to be highly induced in the skin under heat stress in the segregating russet population. Only one gene was polymorphic; however it was localized to chromosome 2, so cannot correspond to rusB or rusC. Evaluation of AFLP markers tightly linked to rusB and rusC showed that these specific alleles are not associated with russeting in unrelated germplasm, and thus are not useful for MAS per se. To develop markers useful in applied breeding, it will be necessary to screen alleles of additional tightly linked loci, as well as to identify additional russet (heat-induced and/or native) related genes.

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Riveros, Guillermo, Felipe Acosta, Reena Patel et Wayne Hodo. Computational mechanics of the paddlefish rostrum. Engineer Research and Development Center (U.S.), septembre 2021. http://dx.doi.org/10.21079/11681/41860.

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Purpose – The rostrum of a paddlefish provides hydrodynamic stability during feeding process in addition to detect the food using receptors that are randomly distributed in the rostrum. The exterior tissue of the rostrum covers the cartilage that surrounds the bones forming interlocking star shaped bones. Design/methodology/approach – The aim of this work is to assess the mechanical behavior of four finite element models varying the type of formulation as follows: linear-reduced integration, linear-full integration, quadratic-reduced integration and quadratic-full integration. Also presented is the load transfer mechanisms of the bone structure of the rostrum. Findings – Conclusions are based on comparison among the four models. There is no significant difference between integration orders for similar type of elements. Quadratic-reduced integration formulation resulted in lower structural stiffness compared with linear formulation as seen by higher displacements and stresses than using linearly formulated elements. It is concluded that second-order elements with reduced integration and can model accurately stress concentrations and distributions without over stiffening their general response. Originality/value – The use of advanced computational mechanics techniques to analyze the complex geometry and components of the paddlefish rostrum provides a viable avenue to gain fundamental understanding of the proper finite element formulation needed to successfully obtain the system behavior and hot spot locations.

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Gaugler, Randy, Itamar Glazer, Daniel Segal et Sarwar Hashmi. Molecular Approach for Improving the Stability of Insecticidal Nematodes. United States Department of Agriculture, novembre 2002. http://dx.doi.org/10.32747/2002.7580680.bard.

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Our overall goal is to improve insecticidal nematodes by genetically engineering strains capable of entering an enhanced state of dormancy that provides improved stability. Objectives: 1. Clone and sequence tps-l homologue from Steinernema carpocapsae. (Revised: A failure to isolate the tps gene group from Steinernema precipitated a redirection to identifying other genes involved in insecticidal nematode desiccation process.) 2. Incorporate cloned tps-l gene into S. carpocapsae to obtain overexpression, thereby, enhancing desiccation tolerance. (Revised: Other stress genes in addition to tps-l genes were cloned and efforts at expression in S. carpocapsae were conducted) 3. Characterize the transgenic strains. No other biological control agent offers more impressive attributes than insecticidal nematodes. However, their potential is limited by the bane of nearly all biological control agents: poor stability. This leads to inadequate shelf-life and ultimately reduced field efficacy. Nematode storage is based on desiccation, yet insecticidal species are only capable of partial desiccation termed quiescent anhydrobiosis. Overwhelming evidence has shown that when the disaccharide compound trehalose is elevated in anhydrobiotic organisms such as yeast, plants, and nematodes it enables these organisms the ability to survive environmental stresses i.e., desiccation. Armed with this information our goal was to improve insecticidal nematodes stability by engineering trehalose overexpression.

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Osadchyi, Viacheslav, Hanna Varina, Evgeniy Prokofiev, Iryna Serdiuk et Svetlana Shevchenko. Use of AR/VR Technologies in the Development of Future Specialists' Stress Resistance : Experience of STEAM-Laboratory and Laboratory of Psychophysiological Research Cooperation. [б. в.], novembre 2020. http://dx.doi.org/10.31812/123456789/4455.

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The scientific article deals with the analysis of peculiarities of the use of innovative AR/VR technologies in the process of developing future special- ists’ stress resistance. Based on the analysis of the introduction of AR/VR tech- nologies in the context of the implementation of a competency-based approach to higher education; modern studies on the impact of augmented reality on the emotional states and physiological features of a person in a stressful situation, the experience of cooperation of students and teachers at the Laboratory of Psy- chophysiological Research and STEAM-Laboratory has been described. Within the framework of the corresponding concept of cooperation, an integrative ap- proach to the process of personality’s stress resistance development has been designed and implemented. It is based on the complex combination of tradition- al psycho-diagnostic and training technologies with innovative AR/VR technol- ogies. According to the results it has been revealed that the implementation of a psycho-correction program with elements of AR technologies has promoted an increase of the level of personality’s emotional stability and stress resistance. The level of future specialists’ situational and personal anxiety has decreased; the level of insecurity, inferiority, anxiety about work, sensitivity to failures has also decreased; the level of flexibility of thinking and behavior, ability to switch from one type of activity to another one has increased; general level of person- ality’s adaptive abilities has also increased. The perspectives of further research include the analysis of the impact of AR/VR technologies on the future profes- sionals’ psychological characteristics in order to optimize the process of im- plementing a learner-centered approach into the system of higher education.

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