823 resultados para work stress
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Major funding was provided by the UK Natural Environment Research Council (NERC) under grant NE/I028017/1 and partially supported by Boğaziçi University Research Fund (BAP) under grant 6922. We would like to thank all the project members from the University of Leeds, Boğaziçi University, Kandilli Observatory, Aberdeen University and Sakarya University. I would also like to thank Prof. Ali Pinar and Dr. Kıvanç Kekovalı for their valuable comments. Some of the figures were generated by GMT software (Wessel and Smith, 1995).
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Major funding was provided by the UK Natural Environment Research Council (NERC) under grant NE/I028017/1 and partially supported by Boğaziçi University Research Fund (BAP) under grant 6922. We would like to thank all the project members from the University of Leeds, Boğaziçi University, Kandilli Observatory, Aberdeen University and Sakarya University. I would also like to thank Prof. Ali Pinar and Dr. Kıvanç Kekovalı for their valuable comments. Some of the figures were generated by GMT software (Wessel and Smith, 1995).
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Acknowledgements: We would like to thank Hanna Bensch and Hannes Weise for assistance with the collection of samples in the field. This work was supported by the Biodiversity and Ecosystem Services in a Changing Climate (BECC; a joint Lund-Gothenburg University initiative), the Swedish Research Council (EIS, BH), the Crafoord Foundation (EIS, BH), the Swedish Royal Society (EIS), ‘Gyllenstiernska Krapperupstiftelsen (EIS), the Wenner-Gren Foundations (postdoctoral stipend to RYD), EU FP7 (Marie Curie International Incoming Fellowship to RYD), the Kungliga Fysiografiska Sällskapet i Lund (MW) and the Helge Ax:son Johnson Stiftelse (MW). B.H. and E.I.S. conceived of the study. L.L. developed the hypotheses to be tested. L.L. and R.D. collected the field data and samples. All six authors contributed to planning RNA-seq analyses. P.C. and L.L. analysed the data. L.L. wrote the manuscript, which all six authors edited.
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Le récepteur éboueur CD36 facilite l’internalisation des acides gras libres non estérifiés (AGNE) au niveau des tissus cardiaque et périphériques. Lors d’une ischémie-reperfusion du myocarde (MI/R), les dommages produits sont en partie liés à l’internalisation des AGNE et à la production d’espèces réactives de l’oxygène, contrairement à ce qui est observé chez des souris déficientes en CD36 (CD36-/-). Nous avons émis l’hypothèse selon laquelle le CP-3(iv), un ligand synthétique du récepteur CD36, exercerait un effet cardioprotecteur en réduisant la taille de la zone myocardique infarcie lors d’une ischémie transitoire du myocarde. Nos objectifs étaient 1) de déterminer l’effet cardioprotecteur du CP-3(iv) et 2) de définir son mécanisme. Pour cela, des études in vivo et ex vivo ont été faites. Des souris de type sauvage ont été traitées avec le CP-3(iv) (289 nmol/kg) par voie sous-cutanée pendant 14 jours avant d’être soumises à 30 minutes d’ischémie suivant la ligature de l’artère coronaire gauche descendante et de sa reperfusion pendant une période de 6 ou 48 heures. De plus, des coeurs isolés de souris ont été perfusés 30 minutes, suivi de 40 minutes à faible débit (10%) et de 30 minutes de reperfusion pendant laquelle le coeur est perfusé avec le CP-3(iv) à une concentration de 10-6 M. Nos travaux ont montré que l’effet cardioprotecteur d’un traitement préventif par le CP-3(iv) permet de diminuer la taille de l’infarctus et préserve l’hémodynamie cardiaque de façon dépendante du CD36 puisque cet effet est non visible chez les souris CD36-/-. De plus, le CP-3(iv) exerce non seulement un effet systémique, mais aussi un effet cardioprotecteur direct sur le coeur isolé.
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Background: This study examines perceived stress and its potential causal factors in nurses. Stress has been seen as a routine and accepted part of the healthcare worker’s role. The lack of research on stress in nurses in Ireland motivated this study. Aims: The aims of this study are to examine the level of stress experienced by nurses working in an Irish teaching hospital, and investigate differences in perceived stress levels by ward area and associations with work characteristics. Method: A cross-sectional study design was employed, with a two-stage cluster sampling process. A self-administered questionnaire was used to collect the data and nurses were investigated across ten different wards using the Nursing Stress Scale and the Demand Control Support Scales. Results: The response rate was 62%. Using outpatients as a reference ward, perceived stress levels were found to be significantly higher in the medical ward, accident and emergency, intensive care unit and paediatric wards (p<0.05). There was no significant difference between the wards with regard to job strain, however, differences did occur with levels of support; the day unit and paediatric ward reporting the lowest level of supervisor support (p<0.01). A significant association was seen between the wards and perceived stress even after adjustment (p<0.05). Conclusion: The findings suggest that perceived stress does vary within different work areas in the same hospital. Work factors, such as demand and support are important with regard to perceived stress. Job control was not found to play an important role.
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Critical bed shear stress for incipient motion has been determined for biogenic free-living coralline algae known as maërl. Maërl from three different sedimentary environments (beach, intertidal, and open marine) in Galway Bay, west of Ireland have been analysed in a rotating annular flume and linear flume. Velocity profile measurements of the benthic boundary layer, using an Acoustic Doppler Velocimeter, have been obtained in four different velocity experiments. The bed shear stress has been determined using three methods: Law of the Wall, Turbulent Kinetic Energy and Reynolds Stress. The critical Shields parameter has been estimated as a non-dimensional mobility number and the results have been compared with the Shields curve for natural sand. Maërl particles fall below this curve because its greater angularity allows grains to be mobilised easier than hydraulically equivalent particles. From previous work, the relationship between grain shape and the settling velocity of maërl suggests that the roughness is greatest for intertidal maërl particles. During critical shear stress determinations, beds of such rough particles exhibited the greatest critical shear stress probably because the particle thalli interlocked and resisted entrainment. The Turbulent Kinetic Energy methodology gives the most consistent results, agreeing with previous comparative studies. Rarely-documented maërl megaripples were observed in the rotating annular flume and are hypothesised to form at velocities ~10 cm s-1 higher than the critical threshold velocity, where tidal currents, oscillatory flow or combined-wave current interaction results in the preferential transport of maërl. A determination of the critical bed shear stress of maërl allows its mobility and rate of erosion and deposition to be evaluated spatially in subsequent applications to biological conservation management.
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Far-field stresses are those present in a volume of rock prior to excavations being created. Estimates of the orientation and magnitude of far-field stresses, often used in mine design, are generally obtained by single-point measurements of stress, or large-scale, regional trends. Point measurements can be a poor representation of far-field stresses as a result of excavation-induced stresses and geological structures. For these reasons, far-field stress estimates can be associated with high levels of uncertainty. The purpose of this thesis is to investigate the practical feasibility, applications, and limitations of calibrating far-field stress estimates through tunnel deformation measurements captured using LiDAR imaging. A method that estimates the orientation and magnitude of excavation-induced principal stress changes through back-analysis of deformation measurements from LiDAR imaged tunnels was developed and tested using synthetic data. If excavation-induced stress change orientations and magnitudes can be accurately estimated, they can be used in the calibration of far-field stress input to numerical models. LiDAR point clouds have been proven to have a number of underground applications, thus it is desired to explore their use in numerical model calibration. The back-analysis method is founded on the superposition of stresses and requires a two-dimensional numerical model of the deforming tunnel. Principal stress changes of known orientation and magnitude are applied to the model to create calibration curves. Estimation can then be performed by minimizing squared differences between the measured tunnel and sets of calibration curve deformations. In addition to the back-analysis estimation method, a procedure consisting of previously existing techniques to measure tunnel deformation using LiDAR imaging was documented. Under ideal conditions, the back-analysis method estimated principal stress change orientations within ±5° and magnitudes within ±2 MPa. Results were comparable for four different tunnel profile shapes. Preliminary testing using plastic deformation, a rough tunnel profile, and profile occlusions suggests that the method can work under more realistic conditions. The results from this thesis set the groundwork for the continued development of a new, inexpensive, and efficient far-field stress estimate calibration method.
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Sjuksköterskor som arbetar på akutmottagningar utsätts regelbundet för stress. Det medför psykiska och fysiska besvär för sjuksköterskor och försämrad omvårdnad för patienten. Studien avser att utifrån vetenskaplig litteratur sammanställa de faktorer som leder till stress för sjuksköterskor som arbetar på akutmottagningar och hur vården påverkas av stressade sjuksköteskor. Syfte Syftet med litteraturstudien var att beskriva vilka faktorer på akutmottagningen som upplevdes bidra till stress för sjuksköterskor som arbetar på en akutmottagning och hur stressen påverkar sjuksköterskors möjligheter att erbjuda en god vård för patienter på akutmottagningen. Metod Studien har genomförts som en litteraturstudie. I studien användes 15 artiklar som bestod av både kvalitativ och kvantitativ ansats. Materialet hämtades i databaserna CINAHL och PubMed. Resultat Resultatet visar att det finns flera olika faktorer som bidrar till stress för sjuksköterskor på akutmottagningen. Stressande faktorer visade sig utifrån studierna i resultatet vara; hög arbetsbelastning och låg bemanning, avsaknad av tid för reflektion för sjuksköterskan, att vårda barn i stressade situationer, hot och våld på akutmottagningen, kommunikation samt smärta och lidande. Hur vården påverkas av sjuksköterskors stress på akutmottagningen var utifrån studierna att patientsäkerheten blev försämrad och att vårdrelationen påverkades. Slutsats Författarna drar slutsatsen att stress påverkar sjuksköteskors arbetsuppgifter på akutmottagningen. Patienters möjlighet till patientsäker och god vård på akutmottagningen påverkas negativt av stressade sjuksköterskor. För att komma till rätta med sjuksköterskebristen på akutmottagningar så är det av betydelse för sjukhusledningen att arbeta preventivt mot stressade sjuksköterskor.
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Forskarnas genuina intresse för den psykosociala arbetsmiljön med koppling mellanchefer gav upphov till att dyka djupare inom området och belysa centrala delar i form av krav, kontroll och socialt stöd. Framåtskridandet går mot en ökad medvetenhet kring den psykosociala arbetsmiljön, då ohälsan i arbetslivet ökar och Arbetsmiljöverkets nya föreskrift om organisatorisk och social arbetsmiljö är i fokus. I linje med en ökad medvetenhet som sker kring den psykosociala arbetsmiljön vill vi rikta ett särskilt fokus till mellanchefer som bör ha en förmåga att hantera krav både uppifrån och ned. Studien har främst utgått från Robert Karaseks och Töres Theorells Krav – kontroll – stödmodellen. Syftet är att undersöka mellanchefers upplevelse med fokus på den psykosociala arbetsmiljön i ett privat företag inom distributions- och logistikverksamhet. Metoden har bestått av en kvalitativ metod i form av en fallstudie där semistrukturerade intervjuer ligger som grund med åtta respondenter ifrån distributionscentret. Resultatet uppvisar att mellancheferna har en hög grad av inflytande, upplevelsen av arbetskrav varierar men i koppling till befattningen är kraven rimliga. Det sociala stödet upplevs som bra på arbetsplatsen och anses av funktionscheferna som en viktig och central del i arbetet. Slutsatser som har uppnåtts är att funktionscheferna har rimliga krav och upplever en bra nivå av kontroll i arbetet, men att ha en alltför hög kontroll i arbetet kan leda till negativ stress. En balans i pendlingen mellan aktiva arbeten och lågstressarbeten anses vara en fördel för att bevara en god psykosocial arbetsmiljö. Detta för att motverka de negativa effekterna som kan uppstå av att befinna sig inom varje komponent för länge. I studien har det påvisats att företaget anses ha en god psykosocial arbetsmiljö och därmed kan ses som ett gott exempel i arbetslivet.
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O stress é a doença da actualidade, devido à exigência e à pressão emocional que o meio pode exercer sobre todas as pessoas, quer no seu ambiente pessoal quer no ambiente profissional. O termo stress serve cada vez mais como justificação ou forma de expressão de irritações, mal-estar físico e mental, cansaço, ansiedade e depressões. Todavia torna-se pertinente percebermos a evolução do stress enquanto conceito e enquanto doença. Neste trabalho contextualizamos o stress no âmbito da Emergência Pré – Hospitalar, explorando-o, avaliando-o e analisando-o, de modo a podermos perceber os níveis de stress e de que forma os Profissionais de Emergência a ele estão sujeitos. Considerando a base teórica deste estudo definimos, como objectivo geral do trabalho, a avaliação de níveis e factores de stress percepcionados pelos profissionais de emergência médica e como objectivos específicos do estudo a descrever e caracterizar, a nível da região centro, os indivíduos que desempenham funções na emergência préhospitalar, verificar a percepção dos mesmos no que respeita ao stress na sua vida profissional, conhecer como percepcionam os níveis de stress em situações profissionais de emergência e identificar a sua percepção no que concerne aos níveis de stress diário no seu quotidiano. Com estes objectivos, utilizamos uma amostra de 184 profissionais de Emergência Médica divididos por quatro profissões [Médicos, Enfermeiros, Técnicos de Ambulância de Emergência (TAE) e Operadores de Central de Emergência Médica(OPCEM)], com idades compreendidas entre os 20 e os 56 anos. Realizámos ainda um estudo descritivo explorando os questionários de stress no INEM (Instituto Nacional de Emergência Médica) e o Questionário de Vulnerabilidade do Stress com variáveis do estudo demográfico. Podemos concluir que o stress está presente nas actividades de emergência. A sua presença relaciona-se, por um lado, com uma maior ou menor discriminação dos factores stressantes e, por outro, numa maior ou menor centração no sujeito, nomeadamente, um maior perfeccionismo e intolerância à frustração que se apresentam como distressantes para a actividade profissional de emergência. Os aspectos estudados permitem-nos clarificar o sentido e a utilidade do conceito, a sua operacionalidade e a sua importância nos profissionais de emergência. / Stress is the disease of our time, due to the requirement and emotional pressure that the media can have on all people, both in their personal environment and in the professional environment. The word stress increasingly serves as a justification or form of expression of irritation, physical discomfort and mental fatigue, anxiety and depression. However it is pertinent to realize the evolution of stress as a concept and as a disease. In this work, we contextualize under the stress of the Pre - Hospital Emergency, exploring it, assessing it and analyzing it, so you can see the stress levels and how the Emergency Professionals are subject to it. Whereas the theoretical basis of this study as a strategic objective of the work, the assessment of levels and stress factors perceived by medical emergency professionals and specific objectives of the study description and characterization, the level of the center, individuals who perform functions in pre-hospital emergency, check their perception with regard to the stress in your life, know how they experience the stress levels of professionals in emergency situations and identify the perceptions of individuals regarding the levels of daily stress in their daily lives. For this we used a sample of 184 professionals of Medical Emergency divided by four professions [(Doctors, Nurses, Technicians Ambulance Emergency (TAE), Operators of Emergency Medical Center (OPCEM)], aged 20 to 56 years. We conducted a descriptive study also exploring the questionnaires of stress in INEM(National Institute of Medical Emergency) and Vulnerability Questionnaire Stress with variables of the study population. We can conclude that stress is present in emergency activities. Its presence is related to, first, with more or less stressful factors of discrimination and, secondly, a greater or lesser concentration on the subject, in particular, greater perfectionism and intolerance to frustration that stand as unstressed for the activity of emergency professionals. The areas studied will clarify the meaning and usefulness of the concept, its operation and its importance in day-to-day occupation of emergency.
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Le compartiment microvasculaire est une cible importante du stress oxydant qui est un facteur majeur de la dysfonction endothéliale, notamment au cours d’exposition aux rayonnements ionisants. L’altération de l’endothélium induite par le stress oxydant est impliquée dans la toxicité radio-induite des tissus sains. Limiter les dysfonctions endothéliales est donc un enjeu important des traitements radiothérapeutiques actuels. Cet objectif nécessite une meilleure caractérisation de la signalisation du stress oxydant dans les cellules endothéliales. La voie p38 MAPK est incontournable dans la réponse au stress oxydant mais reste encore insuffisamment caractérisée. Par une approche protéomique, nous avons identifié la nucléophosmine (NPM) comme nouveau partenaire de p38 dans le cytoplasme des cellules endothéliales. La phosphatase PP2a est aussi associée à ce complexe NPM/p38. Nos travaux montrent que le stress oxydant (H2O2, 500μM) régule la déphosphorylation de NPM via PP2a, entraine sa dissociation rapide du complexe et favorise sa translocation vers le noyau. De plus, nous montrons que la présence de NPM déphosphorylée au noyau altère la réponse des cellules aux dommages à l’ADN induits par le stress oxydant. Le céramide sphingolipide membranaire est également un facteur important des voies de stress, particulièrement dans les cellules endothéliales. Notre étude aborde donc l’implication de ce sphingolipide dans la régulation de la voie NPM/p38. Une meilleure caractérisation de la voie p38 et de ses acteurs permettra d’identifier de potentielles cibles afin de limiter les dysfonctions endothéliales et leurs conséquences délétères sur les tissus environnants.
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Apesar de todos nós nos esquecermos, é comum atribuir-se os lapsos de memória às pessoas com idades avançadas. A evidência científica tem, no entanto, demonstrado que o esquecimento advém de uma multiplicidade de factores, como por exemplo, o excesso de trabalho, falta de descanso, entre outros. Neste estudo pretende-se saber se existe associação entre a tríade conceptual ansiedade, stress e depressão e os lapsos de memória, numa população em idade activa e com habilitações académicas de nível superior. A amostra é constituída por 68 professores que exercem a sua actividade profissional na Escola E.B. 2,3 de Cantanhede. A recolha dos dados foi efectuada recorrendo a: um questionário elaborado por nós, constituído por questões abertas e fechadas, uma Escala de Ansiedade, Depressão e Stress (EADS-21) e um Questionário de lapsos de memória (QLM). As análises estatísticas dos questionários foram efectuadas recorrendo ao programa informático SPSS (versão 15). As análises tiveram com objectivo final a testagem das hipóteses e tomaram em consideração a natureza métrica das variáveis. / In spite of all of we forget ourselves, it is common the lapses of memory are attributed to the persons with advanced ages. The scientific evidence has, however, when that the oblivion results from a multiplicity of factors was demonstrated, I eat for example, the excess of work, rest lack, between others. In this study one intends to know if there is association between the conceptual triad anxiety, stress and depression and the lapses of memory, in a population in active age and with academic competences of superior level. The sample is constituted by 68 teachers who practice his professional activity in the School E.B. 2,3 of Cantanhede. The gathering of the data was effectuated resorting to: a questionnaire prepared by us, constituted by questions open and shut, a Scale of Anxiety, Depression and Stress (EADS-21) and a Questionnaire of lapses of memory (QLM). The statistical analyses of the questionnaires were effectuated when there is resorting to the program informatics SPSS (version 15). The analyses had with final objective the testate of the hypotheses and took in consideration the metric nature of the variables.
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As situações indutoras de stress são uma constante imutável no dia-a-dia do ser humano e quando esta perturbação não é gerida de forma adequada, acarreta graves prejuízos na saúde dos indivíduos refletindo-se em diversas áreas das suas vidas nomeadamente no trabalho. O presente estudo tem como finalidade identificar a relação entre o stress e as estratégias de coping e perceber se os indivíduos com vulnerabilidade ao stress diferem dos indivíduos sem stress no que concerne às estratégias de coping utilizadas. A vulnerabilidade ao stress foi medida pela escala 23QVS, enquanto as estratégias de coping foram avaliadas pelo Inventário de Resolução de Problemas (IRP), tendo sido, ainda, utilizado um questionário sociodemográfico. A amostra foi composta por 62 trabalhadores de uma empresa de venda a retalho com idades compreendidas entre os 20 e os 44 anos (M=32,02 DP=5,770). Os resultados obtidos revelaram que a vulnerabilidade ao stress se correlaciona de forma negativa e altamente significativa com as estratégias de coping e que indivíduos com e sem vulnerabilidade ao stress não diferem quanto ao uso destas estratégias. / The stress-induction situations are a constant unchanging in human being life, and if this disturbance is not managed adequately can be harmful to the health of individuals and reflected in many areas of their lives including their work. The present study aims to analyze the relationship between stress and coping strategies, and understand if individuals with stress vulnerability differs from individuals without stress in respect to the use of coping strategies. Stress vulnerability was measured by the 23QVS scale and coping strategies by the Inventário de Resolução de Problemas – IRP (Inventory of Problem Solving), and we also used a sociodemographic questionnaire. The sample consisted of 62 workers of a retailing company with ages between 20 and 40 years old (M = 32,02; DP = 5,770). Our research studies reveal that stress vulnerability correlates negatively and highly with coping strategies, and individuals with and without stress vulnerability not differ in the use of these strategies.
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Stainless steels were developed in the early 20th century and are used where both the mechanical properties of steels and corrosion resistance are required. There is continuous research to allow stainless steel components to be produced in a more economical way and be used in more harsh environments. A necessary component in this effort is to correlate the service performance with the production processes. The central theme of this thesis is the mechanical grinding process. This is commonly used for producing stainless steel components, and results in varied surface properties that will strongly affect their service life. The influence of grinding parameters including abrasive grit size, machine power and grinding lubricant were studied for 304L austenitic stainless steel (Paper II) and 2304 duplex stainless steel (Paper I). Surface integrity was proved to vary significantly with different grinding parameters. Abrasive grit size was found to have the largest influence. Surface defects (deep grooves, smearing, adhesive/cold welding chips and indentations), a highly deformed surface layer up to a few microns in thickness and the generation of high level tensile residual stresses in the surface layer along the grinding direction were observed as the main types of damage when grinding stainless steels. A large degree of residual stress anisotropy is interpreted as being due to mechanical effects dominating over thermal effects. The effect of grinding on stress corrosion cracking behaviour of 304L austenitic stainless steel in a chloride environment was also investigated (Paper III). Depending on the surface conditions, the actual loading by four-point bend was found to deviate from the calculated value using the formula according to ASTM G39 by different amounts. Grinding-induced surface tensile residual stress was suggested as the main factor to cause micro-cracks initiation on the ground surfaces. Grinding along the loading direction was proved to increase the susceptibility to chloride-induced SCC, while grinding perpendicular to the loading direction improved SCC resistance. The knowledge obtained from this work can provide a reference for choosing appropriate grinding parameters when fabricating stainless steel components; and can also be used to help understanding the failure mechanism of ground stainless steel components during service.
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Successful social work practice is underpinned by knowledge, theories and research findings from a range of related disciplines, key amongst which is psychology. This timely book offers a grounded and engaging guide to psychology s vital role at the heart of contemporary social work practice. The book skilfully addresses some of the central theoretical developments in psychology from an applied perspective, and explains how these make essential contributions to the methods and theory base of social work in ways that foster critical evaluation and promote best practice. Written by two authors with extensive backgrounds in psychology and social work respectively as well as a deep understanding of the intersections of the two this book delivers a unique synthesis of perspectives and approaches, focusing on their application to the lives of individuals and families. Each chapter contains reflective points and case studies based on contemporary practice realities which are related to the Professional Capabilities Framework for Social Workers and also to the Health and Care Professions Council s Standards of Proficiency. Times have never been more challenging for social work and this book will be an invaluable source of professional support within the ever-more complex psychological worlds where social work takes place. Table of Contents 1. Introduction: The place of psychological knowledge and research in social work training and practice 2. Signposts from Developmental Psychology on Human Development over the Life Course 3. Perspectives from Clinical and Counselling Psychology on Mental Health and Illness 4. Perspectives from Social and Community Psychology: Understanding values, attitudes, diversity and community change 5. Health Psychology: Understanding health, illness, stress and addiction 6. Organizational Psychology: Understanding the individual and the organization in the social work structure 7. Forensic Psychology: Understanding criminal behaviour and working with victims of crime 8. Conclusion References Index