Literatura académica sobre el tema "Stress fisici"
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Artículos de revistas sobre el tema "Stress fisici"
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Miragoli, Sarah, Elisa Stagni Brenca y Paola Di Blasio. "Stress e alleanza genitoriale, rischio di maltrattamento fisico e problemi comportamentali in bambini di etŕ prescolare". MALTRATTAMENTO E ABUSO ALL'INFANZIA, n.º 1 (abril de 2011): 65–85. http://dx.doi.org/10.3280/mal2011-001004.
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Obiettivo di questo studio č analizzare il ruolo di stress e alleanza genitoriale sulla propensione al maltrattamento fisico in 298 nuclei familiari aventi un figlio di etŕ compresa tra 14 e 72 mesi. Alle madri e ai padri sono stati somministrati i seguenti questionari: un questionario per la raccolta dei dati demografici, il Child Abuse Potential Inventory VI (Milner, 1986), il Parenting Stress Index-SF (Abidin, 1995), il Parenting Alliance Measure (Abidin & Konold, 1999), il Child Behaviour CheckList Ages 1˝-5 (Achenbach & Rescorla, 2000). Sono state prese in considerazione eventuali differenze di genere tra i genitori. I risultati mostrano come lo stress e l'alleanza genitoriale siano associate diversamente con la propensione al maltrattamento fisico, e come lo stress genitoriale risulti un predittore significativo della propensione al maltrattamento nelle madri e nei padri. Inoltre, la propensione al maltrattamento fisico e lo stress genitoriale risultano predittori significativi dello sviluppo di problemi di internalizzazione e di esternalizzazione nel bambino.
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Cigala, Ada y Elena Venturelli. ""Cosa sono le emozioni?". Conoscenza emotiva in bambini maltrattati e non maltrattati". MALTRATTAMENTO E ABUSO ALL'INFANZIA, n.º 1 (mayo de 2012): 39–56. http://dx.doi.org/10.3280/mal2012-001004.
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Questo studio confronta alcune caratteristiche psicologiche (la presenza di distress personale e di stress genitoriale, la qualità dell'alleanza genitoriale e la percezione dell'adattamento del bambino) in padri e madri di bambini di età prescolare a basso/alto rischio di maltrattamento fisico (misurato attraverso il punteggio ottenuto alla scala Maltrattamento del Child Abuse Potential Inventory Form VI - CAPI). I partecipanti alla ricerca sono 59 genitori ad alto rischio di maltrattamento fisico (punteggio ≥ 166; gruppo sperimentale) versus 59 genitori a basso rischio (punteggio < 166; gruppo di controllo) pareggiati per età, status civile, livello di istruzione, età e sesso del bambino. I risultati mostrano come sussistano differenze significative tra i due gruppi in tutte le variabili indagate: nello specifico, i genitori ad alto rischio di maltrattamento fisico presentano livelli maggiori di distress personale e di stress genitoriale, una minor percezione di alleanza genitoriale e valutano il comportamento del bambino come più problematico del gruppo dei genitori a basso rischio di maltrattamento fisico.
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Syahitdah, Rohmah y Choirun Nissa. "Aktivitas fisik, stress, dan asupan makanan terhadap tekanan darah pada wanita prediabetes". Jurnal Gizi Indonesia (The Indonesian Journal of Nutrition) 7, n.º 1 (30 de diciembre de 2018): 54–62. http://dx.doi.org/10.14710/jgi.7.1.54-62.
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Backgrounds: Prediabetes and hypertension was being a health issue in the world. Prediabetes and hypertension that occur together will increase the risk of developing Type 2 Diabetes Mellitus (T2DM) and cardiovascular disease. Risk factor of prediabetes and hypertension who can changed is phyisical activity, stress, and nutrition intake.Objectives: This study aims to determine the association between physical activity and stress with blood pressure in prediabetes woman.Methods: The study was done at Semarang in April-June 2016. The cross-sectional study design with the 28 subjects predibetes woman aged 35-50 years selected by consecutive-sampling method. The data taken were blood presure, fat, fiber, sodium, pottasium, calsium, magneisum intake, physical activity score, and stress score. Spearman test were used to determine the association between physical activity and stress with blood pressure. Linear regression were used to multivariate analysisResults: Seventy five percent of subjects was hypertensive with mean of blood pressure was 89,25 ± 14,64 mmHg. The result showed that most subject (64,3%) were minimally active with mean 2.258,4±1.228,8 MET-minutes/week. Majority, subjects were moderate stress (56,3%). There were an association between physical activity with diastolic pressure, but not in systolic pressure. There were no association between stress with blood pressure.Conclusion: Physical activity was only associated with diastolic pressure and stress was not associated with blood pressure.
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Hashimoto, Hisashi, Yoshiyuki Matsuo, Yoshihiro Yokoyama, Haruhiko Toyohara y Morihiko Sakaguchi. "Induction of Apoptosis in Fish Cells by Hypertonic Stress". Fisheries science 64, n.º 5 (1998): 820–25. http://dx.doi.org/10.2331/fishsci.64.820.
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Tanaka, Ryusuke, Yoshikazu Higo, Hisashi Murata y Takashi Nakamura. "Accumulation of Hydroxy Lipids in Live Fish with Oxidative Stress". Fisheries science 65, n.º 5 (1999): 796–97. http://dx.doi.org/10.2331/fishsci.65.796.
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Stagni Brenca, Elisa. "Fattori che incidono sul rischio potenziale di maltrattamento fisico". MALTRATTAMENTO E ABUSO ALL'INFANZIA, n.º 1 (abril de 2011): 47–63. http://dx.doi.org/10.3280/mal2011-001003.
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Il presente lavoro esamina i contributi di ricerca che hanno impiegato il(CAPI; Milner, 1986), allo scopo di sostenerne la validitŕ nel predire la propensione dei genitori al maltrattamento fisico. Tali studi, infatti, hanno evidenziato come i punteggi alladel CAPI siano significativamente correlati ai fattori che la letteratura descrive come tipici dei genitori maltrattanti e predittivi dell'abuso fisico: storia pregressa di maltrattamenti subiti durante l'infanzia; bassa autostima;esterno; stress genitoriale; ansia; rabbia e frustrazione; depressione; caratteristiche dell'ambiente familiare (conflittualitŕ, giovane etŕ e basso livello d'istruzione della madre, abuso di sostanze). Un quadro cosě delineato induce a concludere che i genitori con alti punteggi allasiano effettivamente predisposti ad applicare metodi di disciplina rigidi e coercitivi, che possono sfociare in veri e propri episodi di maltrattamento fisco.
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Ardizzone, Francesca. "Misurare lo stress psico-fisico del caregiver di pazienti cronici: risultati di uno studio". Dissertation Nursing 1, n.º 1 (29 de julio de 2022): 49–63. http://dx.doi.org/10.54103/dn/17647.
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INTRODUZIONE: Il carico dei caregiver è associato a un peggioramento della loro qualità di vita: aumentato rischio d'insorgenza di malattie cardiovascolari, ipertensione arteriosa, depressione e disturbi d'ansia vengono riportati in letteratura. Ad un aumento del carico assistenziale del caregiver è associata anche una precoce istituzionalizzazione del familiare. OBIETTIVI: Misurare i livelli di burden in un campione dei caregiver informali di pazienti cronici attraverso la creazione e validazione di una versione italiana modificata del Caregiver Strain Index. METODI: Lo studio ha previsto la traduzione e modifica del Caregiver Strain Index, in seguito somministrato ad un campione di convenienza di caregivers informali di pazienti cronici arruolato nei poliambulatori di un singolo centro ospedaliero. RISULTATI La scala ha un’ottima validità di contenuto (CVI-S=0.95) e di facciata e una buona consistenza interna (α di Cronbach=0.78). Il 75% del campione presenta una situazione di burden eccessivo (Me =8, IQR = [7; 9] cutoff 8). Valori più alti sono riportati nelle donne, nei soggetti con licenza media-inferiore e laurea, nei caregiver conviventi, in quelli che assistono più persone e in quelli i cui assistiti sono affetti da Parkinson (p<0.05 per tutte le variabili). Conclusioni: La versione italiana modificata del Caregiver Strain Index è uno strumento valido, affidabile, veloce e di semplice utilizzo capace di valutare i livelli di burden nei caregivers che assistono i pazienti cronici. Gli alti livelli di burden riferiti rivelano la necessità della figura dell’infermiere case manager per la continuità assistenziale al domicilio.
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TAKEUCHI, KAZUHARU, HARUHIKO TOYOHARA, MASATO KINOSHITA y MORIHIKO SAKAGUCHI. "Role of taurine in hyperosmotic stress response of fish cells". Fisheries science 68, sup2 (2002): 1177–80. http://dx.doi.org/10.2331/fishsci.68.sup2_1177.
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Napitupulu, Rosintan. "HUBUNGAN ANTARA AKTIFITAS FISIK DAN MANAJEMEN STRES PADA MAHASISWA FISIOTERAPI". Jurnal Fisioterapi dan Rehabilitasi 5, n.º 1 (11 de enero de 2021): 76–95. http://dx.doi.org/10.33660/jfrwhs.v4i2.112.
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Improving the level of public health is the noble ideal of the country in every development plan both for the long and short term. Doing physical activity that is right and according to age will have an impact on physical, mental and social health. Good stress management on a person will have a positive impact, both for physical and social health in the community. This study aims to determine the relationship and the level of relationship between physical activity variables and stress management in physiotherapy students. This study uses a descriptive correlative research design, with a sample of 108 students covering semesters one, three and six who attended and filled out the questionnaire at a predetermined time (accidental sampling). Data on healthy behavior of students was taken using the HPLP-II questionnaire. Data analysis using the SPSS program by finding the average value of the variable physical activity and stress management which then performed a statistical correlation test of two variables. Results: the average physical activity value was 1,960 and stress management was 2,486. Correlation test is worth 0.994 which means that the two variables have a high relationship. The conclusion of this study is that the lower the physical activity a person does, the lower the stress management. Relationship between physical activity and stress management of students Physiotherapy has a high relationship (perfect association).
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Chien, Liang-Tan, Deng-Fwu Hwang y Sen-Shyong Jeng. "Effect of Thermal Stress on Dietary Requirement of Vitamin C in Thornfish Terapon jarbua". Fisheries science 65, n.º 5 (1999): 731–35. http://dx.doi.org/10.2331/fishsci.65.731.
Texto completoTesis sobre el tema "Stress fisici"
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Silvestri, Sonia. "Meccanismi molecolari coinvolti nella sarcopenia dell’anziano: ruolo dell’esercizio fisico sullo stress ossidativo e la funzionalità mitocondriale". Doctoral thesis, Università Politecnica delle Marche, 2016. http://hdl.handle.net/11566/243161.
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La Sarcopenia è una condizione non patologica legata all’invecchiamento, relativa alla perdita sia di massa muscolare che della forza e in quanto tale, determina il rallentamento nello svolgimento delle più semplici attività quotidiane incrementando il rischio di cadute, di fratture ed un conseguente abbassamento della qualità della vita. Il significativo costo socio-economico dei disordini muscolo scheletrici generati dalla sarcopenia nella popolazione anziana richiede interventi preventivi e terapeutici. Al momento non è stato approvato l’utilizzo di nessun farmaco per il trattamento dei disturbi legati alla sarcopenia.
I fattori che contribuiscono all’insorgenza della sarcopenia sono di tipo nutrizionale, ormonale, metabolico e legato ad alterazioni immunologiche, che nell’insieme determinano delle modificazioni a carico del sistema neuromuscolare le quali causano a loro volta il malfunzionamento dei motoneuroni e atrofia a livello delle miofibre. Ci sono numerose evidenze che supportano il declino delle funzioni mitocondriali e il conseguente incremento nelle Specie Reattive dell’Ossigeno (ROS) che contribuiscono all’invecchiamento del muscolo e quindi all’insorgenza della sarcopenia. Nei soggetti anziani inoltre, si verifica uno sbilanciamento dell’equilibrio cellulare a favore della produzione di ROS che potrebbe compromettere la risposta adattativa dell’esercizio fisico. Il signaling radicalico, alla base della risposta antiossidante all’interno della cellula, rappresenta il fattore chiave nel mantenimento sia della forza muscolare che delle performance fisiche.
In questo senso, il presente studio ha focalizzato l’attenzione sull’impatto della supplementazione con antiossidanti (ubichinolo) in combinazione con l’esercizio fisico regolare per contrastare la sarcopenia. L’ubichinolo è un cofattore lipofilico endogeno con entrambe le funzioni, antiossidante e bioenergetica e i cui livelli di sintesi tendono a diminuire con l’avanzare dell’età.
Gli aspetti poc’anzi citati sono stati valutati su modelli murini di invecchiamento sottoposti ad attività fisica regolare e a supplementazione con ubichinolo usando un disegno fattoriale. Inoltre, colture cellulari di miociti, giovani e anziani, sono state esposte in vitro a concentrazioni crescenti di statina, un farmaco comunemente impiegato nella prevenzione degli effetti ipercolesterolemici ma in grado di ridurre la sintesi endogena di Coenzima Q.
I dati mostrano un effetto sinergico dell’ubichinolo e l’attività fisica regolare nella promozione della biogenesi mitocondriale e nel contemporaneo abbassamento dello stress ossidativo a livello del muscolo scheletrico. Questi effetti sono evidenti nella popolazione anziana e meno negli organismi senescenti che risultano essere molto più compromessi a livello cellulare. I risultati suggeriscono un’interessante prospettiva legata all’utilizzo dell’ubichinolo nel trattamento preventivo dell’insorgenza della sarcopenia in associazione all’esercizio fisico, in condizioni subliminali di deficit di sintesi di Coenzima Q, durante l’invecchiamento e il trattamento farmacologico con statine.Sarcopenia is a condition of age-related loss of muscle mass and strength which affects balance, gait and overall ability to perform tasks of daily living, with increased risk of falls and fractures and low quality of life. The significant socio-economic costs of musculoskeletal disorders in the expanding elderly human population urges for prevention and therapeutic interventions. There are currently no approved drug treatments for sarcopenia. Factors contributing to sarcopenia have been related to nutritional, hormonal, metabolic, and immunologic alterations that affect the neuromuscular system and lead to loss of motor neurons and myofiber atrophy. There is some evidence to support that the decline in mitochondrial function and the consequent increase in Reactive Oxygen Species (ROS) production contribute to muscle ageing and sarcopenia. Furthermore, age-related ROS imbalance may underpin the blunted adaptive response to physical exercise highlighted in elderly people. Thus, the interplay between ROS and protective antioxidant response in the cell is regarded as a key factor in maintaining muscle strength and physical performance. In this view, the present project focuses on the impact of antioxidant (e.g. ubiquinol) supplementation in combination with exercise training to counteract sarcopenia. Ubiquinol is a lypophilic endogenous cofactor with both antioxidant and bioenergetics function whose levels are known to decrease with age. In the project these issues have been studied in murine models of ageing subjected to physical exercise and supplemented with ubiquinol using a factorial design. Moreover cultured myocytes have been exposed in vitro to statin, common HMG-CoA inhibitor drugs with hypocholesterolemic effect, that are able to affect CoQ synthesis. Presented Data shows a synergistic effect of Ubiquinol and physical exercise in promoting mitochondrial biogenesis and lowering oxidative stress at muscular level. These effects are prominent in the ageing population but result less effective in senescent organisms that are more compromised. The data suggest an interesting prospective for ubiquinol treatment in association with physical exercise in prevention of sarcopenia in condition of subliminal deficit of CoQ synthesis including ageing and statin treatment.
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Abruzzo, Provvidenza Maria <1981>. "Stress ossidativo ed adattamenti morfo-funzionali e biomolecolari in due condizioni opposte: denervazione ed esercizio fisico". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/3008/1/Abruzzo_Provvidenza_Maria_tesi.pdf.
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Abruzzo, Provvidenza Maria <1981>. "Stress ossidativo ed adattamenti morfo-funzionali e biomolecolari in due condizioni opposte: denervazione ed esercizio fisico". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/3008/.
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Longhinotti, Maira. "Ambiente fisico e linguaggio ambientale nel processo di rigenerazione affettiva dallo stress in camere di degenza pediatrica". Doctoral thesis, Università degli studi di Ferrara, 2015. http://hdl.handle.net/11392/2389070.
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Environmental messages communicated by the physical environment are considered a source of stress in hospitals when represented by negative meanings or meanings which do not match patient’s environmental expectations. In the present study, it is assumed that the hospital physical environment, through its meaning, allows or even promotes affective stress restoration when raises positive cognitions and affects. In this way, it was proposed to identify visual physical attributes of pediatric inpatient rooms that communicate environmental messages related to affective stress restoration. The study adopted a mixed method design, by associating direct and indirect observation; a qualitative and quantitative research strategy; and a descriptive profile. In total, 124 pediatric patients from the age of 8 and 66 parents participated in the study. The investigation was conducted in pediatric inpatient rooms of four hospitals in north-central Italy: one pediatric hospital and three general hospitals. Data collection took place in two phases, comprising: (a) direct observation of the physical built environment (inpatient rooms), observation of traces, administration of questionnaires to patients and parents, as well as consultation to medical records and architectural plans (Phase 1); (b) semi-structured interviews with patients from photographs of inpatient rooms (Phase 2). Data analysis involved descriptive and relational statistical analysis and thematic-categorical content analysis. It was possible to empirically establish a relation between environmental meaning and affective stress restoration. A better environmental evaluation was associated with a greater restoration. In addition, restoration was greater the more patients considered the hospital room as reassuring, orderly, cheerful, relaxing, comfortable, with fresh air, spacious, pleasant and lively. It was found that the following physical attributes of inpatient rooms play a role in the construction of these meanings: residential appearance, fresh air, visual and physical access to natural outdoors, moderate amplitude, opportunities for privacy, opportunities for social interaction, access to technologies, paintings and illustrations on the wall, support for parents’ needs, presence of toys and play areas, conservation and order of the healthcare facility. The results were discussed from multimethodological convergence and with the support of the literature regarding Restorative Environments, Environmental Perception and Cognition, and Evidence-based Design. The study of restorative environments and process from the affective stress condition by analyzing environmental meanings proved relevant, highlighting some of the issues that may promote pediatric patient’s welfare. This volume includes an English version of the thesis and, in the Appendix, the research report related to a complementary study conducted at the HELIX Centre, London.
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Oliva, Aravena Cesar Jaime. "Efeitos do estresse fisico no processamento das informações visuais perifericas em motoristas do transporte coletivo urbano". [s.n.], 1998. http://repositorio.unicamp.br/jspui/handle/REPOSIP/274880.
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Orientador: Jorge Sergio Perez GallardoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Educação Fisica
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Resumo: O presente estudo teve como objetivo investigar os efeitos do estresse físico no processamento das informações visuais periféricas em motoristas do transporte coletivo urbano, os quais foram classificados de acordo com seu tempo de experiência como motoristas profissionais: -5 anos, 5-10 anos e +1Oanos de experiência. Participaram da pesquisa 30 motoristas das cidades de Concepción e Talcahuano, Chile, selecionados de forma aleatória, os quais foram divididos sem três grupos de 10 indivíduos segundo seus tempos de experiência. O campo visual do motorista foi medido em um laboratório com uma luminosidade de 1.500 luxo. A situação experimental consistiu na formação de um campímetro de 1900no eixo horizontal. A tarefa dos motoristas foi pedalar numa bicicleta ergométrica, na qual foram aplicadas três cargas crescentes (leve, submáxima, máxima) de 3 minutos cada uma. Os motoristas foram orientados para detectar e reconhecer os estímulos luminosos (lâmpadas coloridas de 12v, 4w) que apareciam no campo visual periférico, mediante sua visão binocular, sem movimento de olhos e/ou cabeça. Para determinara homogeneidade da amostragem fizeram se uma anamnese geral, um exame oftalmológico e um exame de campimetria dinâmica, pois os indivíduos que participaram do estudo deviam ter visão normal sem correções. Para determinar as cargas de trabalho, realizaram-se, primeiramente,um teste de telemetria para conhecer a resposta cardíaca destes no lugar de trabalho e, num segundo momento, foi realizado um teste de esforço. Para a coleta de dados foi construído um sistema eletromecânico, complementado por um microcontrolador Little Star, que permitiu comandar os estímulos luminosos periféricos de forma que os motoristas pudessem responder de acordo com a sua sensibilidade de percepção visual, enquanto pedalavam na bicicleta ergométrica Com base na análise de variância com medidas repetidas os dados permitem afirmar que existem diferenças estatísticas (p < 0,05) em relação ao tempo de experiência dos grupos e da carga, na decisão perceptiva da detecção. Quanto ao reconhecimento, também revelou diferenças estatísticas em relação à carga (p < 0,05) e interação grupo-carga (p < 0,01). O estudo mostrou, por meio da análise estatística do teste qui-quadrado (X2), que não existe diferença estatística (p > 0,05) no número de erros de detecção e reconhecimento, dependendo do tempo de experiência. Também se verificou, por meio da análise estatística de Friedman (X2p), que as cargas crescentes de trabalho têm influência significativa (p < 0,01) nas decisões perceptuais de detecção e reconhecimento dos indivíduos categorizados como motoristas
Abstract: The present study had as its objective to investigate the effects of physical stress in the peripheric visual information processing in drivers from urban collective transportation, which were classified according to their time of experience as professional drivers: -5 years, 5-10 years and +10years experience. Thirty drivers from the cities of Concepción and Talcahuano, Chile, participated of the research, being selected at random. They were divided in three groups of ten individuals each, according to their time of experience. The drivers' field of view was measured in a laboratory with a luminosity of 1.500 lux. The experimental situation consisted in the formation of a perimeter of 1900on the horizontal axle. The drivers' task was pedaling an ergonometer bicycle where three increasing loads were applied to (Iight, sub-maximum and maximum) of 3 minutes each. The driver ware oriented to detect and recognize the luminous stimulus (color lamps: 12v, 4w) which appeared in the peripheral field of view through his binocular vision, with no movement Itom the eyes and / or the head. To determine the homogencity of the sample, it were applied a general valuation, an ophthalmologic examination and a dinamic campimeter examination, because the individual who participed of the study should have normal vision without corrections. To determine the work loads, it ware first applied a telemeter test to know his cardiac answer in the place of work and, in a second moment, an effort test was aceomplished. For the data colleetion, an electromechanical system was built, complemented by a Little Star miero eontroler wich allowed to command the peripheral lurninous stimulus in sueh a . way that the drivers could answer,aceordingto their visualcperceptioncsensibility while pedaling an ergonometer bicycle. With base in analysis of variation with repeated measures the data allow to affirro that there are statistieal differences (p < 0,05) respeeting the time of experience of the group and the load in the perceptible decision of the detection. The recognition also revealed statistieal differenees respeeting the loads (p < 0,05) and group-Ioad interaction (p < 0,01). The study showed through the statistical analysis of the Chi Squared test (X2) the there is not a statistieal differenee (p > 0,05), in the number of deteetion and recognition mistakes depending on the time experienee. It was also eheeked through the statistieal analysis of Friedman (X2p) that the inereasing loads of work have significant influence (p < 0,01) in the perceptible decision of detection and recognition of the individuals categorized as drivers
Doutorado
Doutor em Educação Física
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Linardi, Marcio. "Estudo da sensibilidade aos efeitos cronotropico e inotropico das catecolaminas em atrios isolados de ratos submetidosa treinamento fisico". [s.n.], 1992. http://repositorio.unicamp.br/jspui/handle/REPOSIP/314613.
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Orientador : Regina Celia SpadariDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: O ¿stress¿ se reflete em estímulo nervoso e humoral, através da ativação do sistema nervoso simpático e do eixo hipotálamo-adrenal, que resulta em aumento dos níveis plasmáticos de catecolamina e de glicocorticóides. O exercício físico, por constituir um trabalho biológico, encontra-se intimamente relacionado ao fenômeno de ¿stress¿, determinando alterações anatômicas e fisiológicas na maioria dos sistemas do organismo. Entre estas, destacam-se a hipertrofia cardíaca, a bradicardia de repouso e as diminuições de sensibilidade aos efeitos cronotrópico e inotrópico as catecolaminas. Neste trabalho nós analisamos as variações de freqüência de batimentos espontâneos dos átrios direitos , a tensão desenvolvida pelos átrios esquerdos , as respostas cronotrópica e inotrópica ao ISSO e à NA de átrios direitos e esquerdos e a capacidade de reação ao ¿stress¿ do tecido cardíaco isolado de ratos submetidos a treinamento físico por natação. Os animais foram sacrificados após 10, 20, 30, 34, 35 , 40 ou 70 sessões diárias de natação, cinco dias por semana, num total de 14 semanas. Os ratos treinados apresentaram aumento da razão entre o peso do coração e o peso corporal, da ordem de 18,1 +/- 2% em relação aos grupos controles. O fenômeno da bradicardia de repouso não foi observado em nossos experimentos
Abstract: Not informed.
Mestrado
Fisiologia
Mestre em Ciências Biológicas
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Zaetta, Cristina. "Disastro del Vajont: conseguenze a lungo termine sulla salute psichica e fisica dei sopravvissuti". Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425042.
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BACKGROUND AND AIMS
The negative impact of traumatic events on psychological functioning has been well-established (Wagner, 2000). Recent research suggests that trauma may have deleterious effects on physical functioning (Schnurr, 1996).
Some research (Lauterbach, 2005) indicates that the relationship between traumatic experiences and health problems could be mediated by post-traumatic stress disorder (PTSD) or depression (MDD). Experts (Ford et al., 2004) suggest that only long term studies may allow to understand the trauma exposure consequences on physical health from a statistical-epidemiological point of view. Two studies on Vajont survivors were conducted by our research group.
The aim of the first study was to assess the psychiatric consequences of the Vajont disaster more than 36 years after the event, with a particular attention to the presence of post-traumatic stress disorder (PTSD) and major depressive disorder (MDD) and to the relationship between the degree of traumatic exposure and its consequences on psychological functioning.
The second study aimed to investigate the relationship between physical health and trauma severiy, post-traumatic stress disorder (PTSD), and major depressive disorder (MDD) in a group of Vajont survivors and in a control group, 44 years after trauma.
METHODS
In the first study, 90 survivors were assessed by means of a semistructured interview to investigate the extent of the traumatic experience and a structured diagnostic interview for the diagnosis of PTSD and MDD.
In the second study, 60 survivors were assessed by means of a semistructured interview to investigate health status, and the extent of the traumatic experience, and a structured diagnostic interview for the diagnosis of PTSD and MDD. The health status was also assessed by the survivor's general practitioner. Some self-reported questionnaires were administred to measure quality of life, social support, temperament and the presence of type D personality. A control group of 48 subjects was assessed, too.
RESULTS
Our first study shows that large scale disasters such as the Vajont one affect the psychological health of survivors for decades. Moreover our research confirms the role of risk factors such as the degree of trauma exposure and female gender in the development of psychiatric consequences after a disaster.
The second study confirms the deleterious effects on physical health of extreme traumatic experiences. This effects do not seem to be related to direct effects of trauma or to the degree of exposure. The study shows the role of PTSD or symptoms of PTSD and social support as mediators between trauma exposure and health status. The trauma consequences, in particular on psychological health, have an influence on the Vajont survivors's quality of life.
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Antunes, Neto Joaquim Maria Ferreira. "Estudo da relação entre estresse oxidativo e sintese de proteinas de estresse "HSP70" no sangue de animais submetidos a diferentes niveis de exercicio fisico". [s.n.], 2003. http://repositorio.unicamp.br/jspui/handle/REPOSIP/314442.
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Orientador: Lucia Pereira da SilvaTese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-03T17:19:16Z (GMT). No. of bitstreams: 1 AntunesNeto_JoaquimMariaFerreira_D.pdf: 2559542 bytes, checksum: ee9c788878e16ce3ef15478cc15b41ef (MD5) Previous issue date: 2003
Resumo: Nosso estudo investigou em amostras de sangue de ratos do tipo ¿Wistar¿ a correlação entre estresse oxidativo (plasma), modulação do estado antioxidante/oxidante (hemácea) e níveis de proteínas de estresse ¿HSP70¿ (leucócito total) em diferentes sobrecargas de corrida em esteira rolante: exercício exaustivo agudo e treinamentos contínuo e intermitente crônico e severo. Os resultados mostraram que o exercício agudo em animais sedentários induziu um aumento nos níveis dos marcadores oxidativos em plasma (proteínas carboniladas e TBARS) juntamente com uma elevação da atividade das enzimas antioxidantes (catalase e gluationa redutase) e da expressão de ¿HSP70¿ em leucócitos. Os protocolos de treinamento crônico mostraram um mesmo padrão adaptativo: o aumento da sobrecarga de exercícios induziu elevação nos níveis de lesões oxidativas e alterações musculares. Porém, obtivemos nesta situação um aumento de atividade das enzimas antioxidantes e níveis de ¿HSP70¿, o que poderia ser considerado uma resposta adaptativa ao estímulo de treinamento. A estabilização da sobrecarga providenciou um decréscimo nos níveis de estresse oxidativo e expressão de ¿HSP70¿ em ambos os protocolos. Porém, os protocolos de treinamento severo, tanto contínuo quanto intermitente, induziram uma acentuada situação de estresse oxidativo e expressão de ¿HSP70¿. A redução no tempo de recuperação entre as sessões de treinamento e a elevação da sobrecarga de corrida foram fatores agravantes para o aumento da severidade do estresse. Concluindo, os marcadores de estresse oxidativo estudados neste trabalho mostraram uma relação direta entre intesidade do exercício e níveis de lesões oxidativas e alterações musculares. A detecção de ¿HSP70¿ foi um importante índice para monitorar a severidade do estresse. Assim, análises de marcadores de estresse oxidativo em conjunto com a detecção de ¿HSP70¿ poderiam ser uma potente ferramenta para controlar a sobrecarga dos exercícios de treinamento, prevenindo a instalação de situações fisiopatológicas graves
Abstract: The present study was designed to investigate in blood samples of rats if there are a correlationship among oxidative stress, modulation of antioxidant/oxidant status and stress protein levels in differents running overloads: acute exhaustive exercise, and chronic and severe (continuous and intermittent protocols) trainings. Our results showed that the acute exhaustive exercise induced in sedentary rats an increase in plasma oxidative markers (carbonyl derivatives and TBARS) together to an upregulation in the erithrocyte antioxidant enzymes (catalase and glutathione reductase) and elevation in HSP70 in leukocytes. The chronic training protocols showed a same pattern of adaptation: the increase in overload of exercise induced an elevation in the oxidative damage and muscle alterations levels. But we had in this situation an increase in antioxidant enzymes activity and HSP70 expression, what would be an adaptative response to the training stimulus. The overload stabilization provided a decrease in the oxidative stress markers levels and HSP70 expression to both protocols. However, the severe training protocols induced a markedly oxidative stress situation and an increase of HSP70 levels. The reduction in the recovery time between the training sessions together an elevation in overload of exercises were an aggravating factor to the increase in the stress severity. In conclusion, the oxidative stress markers studied here showed a close correlation between exercise intensity and oxidative damage and muscle alterations. The HSP70 detection was an important index to monitore the stress severity. Oxidative stress markers analyses and HSP70 detection could be a useful tool to control the overload of training exercises preventing the installation of pathophysiological situations
Doutorado
Bioquimica
Doutor em Biologia Funcional e Molecular
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Pacheco, Carrillo Jaime Humberto. "Stress no trabalho em professores de educação fisica do sistema municipal de educação, na comunidade de Concepcion, oitava região, Chile". [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/274909.
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Orientador: Pedro Jose WintersteinDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Educação Fisica
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Resumo: O objetivo fundamental desta investigação é conhecer a situação particular dos profissionais da educação física, com relação ao fenômeno do stress. Este propósito não é nada fácil se é considerado que o stress é uma reação do sistema geral de adaptação para os diferentes incentivos da vida do homem, na qual o trabalho compõe uma das dimensões que geram stress; e embora esta situação é comum a todas as pessoas que são parte do mundo do trabalho, estudos prévios (Cifuentes1995), demonstram que são os professores, o segmento operário que apresenta o stress mais alto e então, talvez de um modo lógico, surge o interesse para conhecer as realidades particulares de cada uma das áreas da educação, dentro das quais se acha a educação física. É aplicado o auto reporte de sintomas ansiosos, depressivos e somatomorfos para a medição de stress e embora este estudo seja descritivo e não correlacional, é possível coletar informação de outros fatores que normalmente também são potenciais agentes estressores, embora de modo referencial. Os resultados obtidos neste estudo, nos indica que o 85% dos professores de educação física têm níveis de stress altos
Abstract: The fundamental aim (lens) of this investigation (research) is to know the particular situation of the professionals of the physical education, in relation with the phenomenon of the stress. This intention is not easy at all if it thinks that the stress is a reaction of the general system of adjustment to the different stimuli of the life of the man, in which the work composes one of the dimensions that generates stress; and though this situation is common to all the persons who form a part of the world of the work, previous studies (Cifuentes1995), they demonstrate that they are the teachers the labour segment that presents the highest levels of stress and therefore, probably in a logical way, there arises the interest to know the particular realities of each one of the areas of the education, inside which one finds the physical education. The car was applied bring (report) of anxious, depressive symptoms and somatomorfos for the measurement of stress and though this study is descriptive and not correlacional, it was achieved to gather information of other factors that normally are also powerful agents estressores, though in a referential way. The results obtained in this study, indicate us that 85 % of the teachers of physical education has high levels of stress
Mestrado
Ciencia do Desporto
Mestre em Educação Física
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Monti, Mirko. "Black hole evaporation and stress tensor correlations". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7042/.
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General Relativity is one of the greatest scientific achievementes of the 20th century
along with quantum theory.
These two theories are extremely beautiful and they are well verified by experiments, but
they are apparently incompatible.
Hints towards understanding these problems can be derived studying Black Holes, some the
most puzzling solutions of General Relativity.
The main topic of this Master Thesis is the study of Black Holes, in particular the Physics
of Hawking Radiation.
After a short review of General Relativity, I study in detail the Schwarzschild solution with
particular emphasis on the coordinates systems used and the mathematical proof of the
classical laws of Black Hole "Thermodynamics".
Then I introduce the theory of Quantum Fields in Curved Spacetime, from Bogolubov transformations
to the Schwinger-De Witt expansion, useful for the renormalization of the stress
energy tensor.
After that I introduce a 2D model of gravitational collapse to study the Hawking radiation phenomenon.
Particular emphasis is given to the analysis of the quantum states, from correlations to the
physical implication of this quantum effect (e.g. Information Paradox, Black Hole Thermodynamics).
Then I introduce the renormalized stress energy tensor.
Using the Schwinger-De Witt expansion I renormalize this object and I compute it analytically
in the various quantum states of interest.
Moreover, I study the correlations between these objects. They are interesting because they
are linked to the Hawking radiation experimental search in acoustic Black Hole models. In
particular I find that there is a characteristic peak in correlations between points inside and
outside the Black Hole region, which correpsonds to entangled excitations inside and outside
the Black Hole.
These peaks hopefully will be measurable soon in supersonic BEC.
Libros sobre el tema "Stress fisici"
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I fisici per le strade di Roma: La toponomastica di Roma a ricordo di fisici noti e meno noti. Roma: Robin edizioni, 2012.
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Morelli, Edoardo. Nervo Vago: La Guida Definitiva Alla Stimolazione Del Nervo Vago. Esercizi Di Autoaiuto per Ridurre Ansia, Stress e Prevenire e Curare le Infiammazioni. Guarendo Dai Traumi Psico-Fisici. Independently Published, 2021.
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Fisica. Le Scienze, 2016.
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Curi, Francesca. Profili penali dello stress lavoro-correlato. Bononia University Press, 2021. http://dx.doi.org/10.30682/sg270.
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La storia del lavoro è sin dalle sue origini intrecciata con la storia della sua liberazione dalla fatica. Il modello tayloristico dell’operaio come “gorilla ammaestrato” ha ceduto il posto, a seguito di un lento processo evolutivo, a un’organizzazione produttiva nella quale, oltre alla salute, viene assicurato anche il “benessere” psico-fisico del lavoratore. In base al d.lgs. n. 81/2008, tra gli obblighi non delegabili del datore di lavoro, rientra la previsione del rischio stress lavoro-correlato. Dilatare la posizione di garanzia fino a farvi rientrare forme di “malessere” che non assurgono al rango di malattia, arrestandosi al livello di un più generico disagio, può alterare la proporzione tra offesa al bene giuridico e mezzi di difesa, con conseguente violazione di alcuni fondamentali principi di ordine costituzionale. A ciò va aggiunto il costo di una intrinseca inefficacia della formulazione punitiva applicata. In una prospettiva necessariamente de iure condendo si può quindi pensare di valorizzare la “novità” del sistema introdotta dal d.lgs. n. 231/2001. Dotata di un più penetrante effetto dissuasivo, la previsione di una responsabilità diretta della societas – secondo quanto già sperimentato nei paesi di common law – potrebbe favorire la realizzazione dei necessari adeguamenti organizzativi, volti a garantire un livello quantomeno standardizzato di benessere, salute e sicurezza sul posto di lavoro
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Fernando, Rosa Adrian. Claves Para Superar El Estres Y Dormir Bien/ Key to Overcome Strees and Well Sleep: Relajacion Fisica Y Mental. Andromeda Publications, 2006.
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Canditi, Isabella. 8 TECNICHE DI RILASSAMENTO MENTALE e FISICO con ASMR: Guida Passo-Passo per Imparare a Rilassarti, Dormire Meglio e Ridurre lo Stress. Independently Published, 2020.
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Big Bisous Big Bisous DE. Meerestiere : Erwachsenen-Malbuch Anti-Stress Meerestiere Für Kinder und Entdecke Realistische Illustrationen: Fisch Wal Delphin Hai Meeresboden. Independently Published, 2022.
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Metodo Mindfulness: Come Risvegliare la Tua Consapevolezza per Gestire Al Meglio Ansia, Stress, Dolore e Tristezza Migliorando il Tuo Benessere Fisico e Mentale. Independently Published, 2021.
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Parise, Crystal. Metodo Mindfulness: Come Risvegliare la Tua Consapevolezza per Gestire Al Meglio Ansia, Stress, Dolore e Tristezza Migliorando il Tuo Benessere Fisico e Mentale. Independently Published, 2021.
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press, bubbly Co y Penny Craig. Digiuno Intermittente per Donne: Evita gli Spuntini Notturni, Riduci lo Stress e la Pancia, Resetta il Metabolismo con l'aiuto Del D. I. Ritarda l'invecchiamento e Ritrova la Forma Fisica. Independently Published, 2022.
Buscar texto completoCapítulos de libros sobre el tema "Stress fisici"
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Paderno, Diego, Ileana Bodini, Aldo Zenoni, Antonietta Donzella, Lisa Centofante y Valerio Villa. "Proof of Concept Experience in the SPES Experiment: First Solutions for Potentiometers Replacement in System Maintenance". En Lecture Notes in Mechanical Engineering, 301–6. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_48.
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AbstractSPES (Selective Production of Exotic Species) is a large facility, currently under advanced construction at the INFN-LNL (Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro) for the production of Radioactive Ion Beams (RIBs). Coordinated efforts are being dedicated to the development and upgrading of both the accelerator complex and the up-to-date experimental set-ups. This paper describes a work of upgrading as far as the inspection and maintenance of the system is concerned, and it deals with human-centered design methods to reduce the time spent in the radioactive environment of the facility during ordinary maintenance operations and to simplify them, also considering stress conditions of the operator and the mandatory wearable radiation protection devices (such as tracksuit, gloves, oxygen tank mask) which make simple operations difficult.
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Compare, Angelo, Cristina Zarbo, Elena Baldassari y Alberto Bonardi. "Dalla salute mentale a quella fisica: medicina psicosomatica, stress e personalità". En Cultura e salute, 129–59. Milano: Springer Milan, 2013. http://dx.doi.org/10.1007/978-88-470-2781-7_10.
Texto completoActas de conferencias sobre el tema "Stress fisici"
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Setiadi, Tio Azhar Prakoso, Yusuf Hadi Perdana y Supriyanto Rohadi. "ANALISIS COULOMB STRESS GEMPA BUMI DELI SERDANG 16 JANUARI 2017". En SEMINAR NASIONAL FISIKA 2017 UNJ. Pendidikan Fisika dan Fisika FMIPA UNJ, 2017. http://dx.doi.org/10.21009/03.snf2017.02.epa.09.
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Vilsan, Alexandru, Alexandra Raluca Moisescu y Gabriel Anghelache. "Study on the automated control of a motor vehicle in a test cycle on the chassis dynamometer". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-acm-007.
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The automatic operation of the pedals of a motor vehicle represents a first stage of the transition from driving without assistance to rolling in completely autonomous mode. This paper presents the construction of an autonomous control system that actuates the acceleration and braking pedals for a passenger car equipped with an automatic transmission. The system allows the completely autonomous rolling of the vehicle on the chassis dynamometer. This type of control has many advantages such as ensuring a good repeatability of the tests performed or improving the safety in the workplace by reducing human involvement. For this type of automation, a PID controller is used, with the input data being the speed required by the WLTC test cycle. The output data is represented by the position of the actuating elements and the feedback of the system is provided by the actual speed of the motor vehicle. In order to determine the actual speed of the motor vehicle, an incremental optical encoder is mounted to the wheel of the vehicle. The position of the acceleration and braking pedals is determined by the position transducers of the actuating elements. The development of the hardware continues with the design of the assembly that supports the two actuators as well as the parts that allow the connection between the pedals and the execution elements. The actual mechanical stress of the hardware is determined using a finite elements analysis, which requires a 3D model of the automated system components. The stability analysis is performed by checking the tilt of the device and the relative slip between the device and the vehicle floor. For control software design, the Arduino programming environment was chosen, being able to perform the automated control between the input and the output data of the drive system with good accuracy and calculation speed.
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Meinert, Tobias, Mauricio Chaves-Vargas, David Bierbüsse, Eduard Heidebrecht, Renato Negra Renato Negra y Kai-Uwe Schröder. "upBUS – Electrical, autonomous driving, transmodular bus for public transport systems". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-dgt-012.
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Worldwide, regions are on the verge of collapse due to the ongoing urbanization and an increasing number of cars. In order to relieve overcrowded streets, the airspace above the ground must be opened for urban mobility. Aircraft taxis are the logical option to develop urban airspace for private transport. However from a long-term perspective, these won't be the solution to the aforementioned traffic congestion problems. In addition to the high energy consumption, aircraft taxis would rather shift individual traffic from the ground level to the airspace. Therefore, only a further development of public transport will be able to solve current and future problems. upBUS offers the solution by combining the development of two different transport systems, urban ropeways and autonomous electric busses. Ropeway systems are an ideal solution to use the airspace above the street level. They are known for their low investment and operating costs, their short construction times without traffic obstruction, minimal space and energy requirements, as well as enormous routing flexibility. On the other hand, ropeways are characterized by the problem of network integration, as the stations cannot be positioned in any necessary place. There are also areas, such as historic towns, which cannot be crossed by ropeways. The upBUS approach is to merge urban ropeways and autonomous mini buses into a modular system. On the ground level the vehicles act as autonomous electric buses. In a ropeway station they transform into a ropeway cabin. This transformation process works fully automatically during operation and passengers do not have to switch between different transportation systems. The upBUS vehicle consists of three parts. The electric drive technology and all sensors for autonomous driving are integrated into a skateboard which acts as the driving unit. The ropeway provides a suspension with a connector plate. The third part, the passenger cabin, can either connect to the driving unit or to the connector plate of the ropeway suspension. Thereby, upBUS benefits from the flexibility of buses in combination with the high passenger throughput of urban ropeways. With the upBUS concept, urban ropeways are not a stand-alone solution any longer and can be easily integrated into the public transportation system. The key technology of this transformation concept can be separated into three parts. First, a specific kind of coupling radar is developed, which provides precise positioning data in order to align the bus with the ropeway suspension. If the parts are aligned within the range of a few centimeters a lifting mechanism in the driving unit hoists the cabin into the suspension. Guiding elements align the two parts within a few millimeters. At this point coupling-interfaces on the roof of the cabin couple with counterparts on the suspension while coupling-interfaces between driving unit and cabin decouple. The cabin leaves the station as a ropeway. The transformation process works vice versa. This paper explains in detail the advantages of this new mobility system and describes the technical parts of the transformation process by designing a first prototype which demonstrates the key-technology in November 2020.
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Kumar, Swapnil y Sundar V. Atre. "Design and optimization of brake disc using Multi-Objective genetic algorithm". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-adm-071.
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Analysis of brake disc is carried out to depict the nature of Braking behavior with respect to bump, Analysis of brake disc is carried out to depict the behavior of the braking system with respect to bump, droop in endurance, maneuverability, hill Climb & acceleration. Design calculation and analysis have been carried out for the brake disc and subsequently, design calculations have also been carried out for the brake caliper. Structural, thermal, vibrational, computational fluid dynamics and fatigue analysis has been carried out to optimize and validate the performance of disc brakes. The design of experiments has been carried out for the brake disc in order to optimize the performance of the braking system. Ventilated disc brake with an outer diameter of 175 mm has been used and 83 % performance efficiency is achieved after all the proper validations and analysis. Very fine Meshing has been considered for analyzing the disc brake to obtain maximum efficient results. Stainless Steel (SS-410) Material configuration has been considered for disc brake and performance enhancement of ventilated disc brake is carried out using Matlab, Ansys, and Solidworks. The brake disc is going to be deployed as a common brake disc in the rear part of the ATV responsible for providing effective rear wheel locking. Piaggio double piston fixed calipers have satisfied the piston diameter for wheel locking conditions at rear wheels with DOT-4 Brake fluid in the master cylinder to provide effective braking. The rear disc brake was fixed on the gearbox output shaft and a caliper mount is welded on a rear member of the roll cage. A mathematical model has been generated for carrying out Multi-objective genetic algorithm optimization. The newly designed brake disc is optimum in terms of weight, a factor of safety, thermal dissipation, equivalent stress, vibration with enhanced airflow behavior. Converged residual plots have been obtained in computational fluid dynamics simulation by using 2nd-degree order. In order to meet the frequency of rear disc brake to firing frequency of engine, brake disc has been optimized in terms of vibration considering all the parameters.
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Raste, Thomas, Andree Hohm y Alfred Eckert. "Holistic Motion Control for Personalized and Efficient Vehicle Dynamics". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-vdc-076.
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"This paper describes a new holistic motion control approach for personalized and efficient vehicle dynamics. The control system is part of Continental’s Holistic Driverless Technologies and contributes to the Program Autonomous Driving making cars intelligent and driving safer than ever before. The goals and use-case scenarios of the key functionalities, the logical architecture and the common interface structure leading to best reusability of existing system elements will be presented in the paper. An object oriented design pattern maps the overall system into parent and child systems along different chain of effects. The chains are either build for specific purposes or represent emergent properties like waste heat. Examples of parent/child system pairs are vehicle/chassis, chassis/corner or corner/actuator. Each system distinguishes internally between information providers (observer functions) and managers. Observer functions provide information for the own and the parent level and coordinate limits received from the child level. Manager functions determine requests to control the respective child system. The application of holistic motion control is demonstrated using the example of an electric vehicle with wheel individual electric motors at the front axle and friction brakes at each corner. Vehicle level longitudinal and lateral requests are determined by a dynamic feedforward control with personalizable vehicle responsiveness and damping characteristics. The central element on chassis level is a Model Predictive Controller (MPC) requesting corner module forces while accounting for limits of stability and energy. A twin track model is used to describe the dynamics of the chassis. Time variant system matrices are generated by linearization and discretization at every sampling instant. Tire-road friction circles constraining the admissible forces at the wheels are approximated by polygons. The purpose of these measures is to ensure the applicability of convex quadratic programming suitable for real time embedded optimization. Corner modules process the incoming stream of chassis requests and generate a stream of requests to the actuators. A corner module MPC framework at the front axle is able to optimally split the wheel braking torque among the redundant actuators, while providing anti-lock braking features by wheel slip regulation. This approach offers fast transient response, without compromising the energy recuperation efficiency of the electric motors taking different dynamic authorities of friction brake and electric motor into account. Continental is aware of its responsibilities in the transformation of mobility and energy efficiency and has actively taken up the challenges. In doing so, we are paving the way to deliver intelligent and sustainable mobility far into the future, while at the same time making a significant contribution to maintaining the attractiveness of personal mobility."
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Liu, Cong y Hui Liu. "Coordinated Control of AFS and DYC for 4WID-EVS Handling and Stability Based on Driving State Prediction". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-vdc-042.
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Considering that the driver's response was not timely under extreme conditions, and there was a time delay between the driver's behavior and the actuator, which would destabilize the vehicle. A coordinated control strategy based on driving state prediction was designed for improving 4WID-EVS lateral stability and handling performance through direct yaw moment control system (DYC) and active front steering (AFS). Firstly, the coordinated control strategy of AFS and DYC was designed, which consisted of two parts: (1) A stability judgeing method based on sideslip angle and sideslip angular velocity phase plane was proposed. The phase plane stability boundary coefficient was adjusted by the road adhesion coefficient, which divided the coordination control region reasonably, so as to judge whether the vehicle was unstable and switched the appropriate subsystem. (2) A driving state prediction algorithm based on data stream mining technology and Markov theory was proposed. The fuzzy control theory which had good robustness was applied, the driving state in the future were made as the inputs, which could determine the weight coefficients of AFS and DYC in advance and effectively avoid the potential danger of entering the unstable state. Secondly, the nonlinear 3-dof vehicle model was used as the reference model, and AFS control strategy was designed based on model predictive control (MPC) theory. At the same time, in order to avoid no solution in the calculation process and improve the convergence speed of the solution process, the relaxation factor was introduced. The quadratic programming algorithm was adopted to find the optimal solution, so as to adjust the front wheel angle in real time to follow the desired path. In order to make up for the deficiency of AFS control strategy, the feedforward - feedback DYC control strategy was designed. A variable weight coefficient LQR feedback control strategy was proposed, and the matrix weight coefficient could be adjusted in real time according to the vehicle steering state in the future and the road adhesion coefficient at the present. Finally, the accuracy and real-time of the prediction algorithm were verified according to different and actual driving cycle data. The simulation experiments of typical working conditions were carried out based on commercial dynamics simulation software to verify the effectiveness of the coordinated control strategy. The simulation results showed that the coordinated control method of AFS and DYC proposed had better effect of driving stability control, which provided a new method for the design of vehicle active safety. KEY WORDS: distributed drive, coordination control, data stream mining, Markov, MPC
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Bolehovsky, Ondrej, Radek Tichanek, Michal Takats y Zbynek Syrovatka. "Development of Advanced Engine Brake for Heavy-Duty Vehicles". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-adm-063.
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In the world of heavy-duty vehicles, the retarding capability is of high interest, as the natural retarding power and braking force per vehicle weight is only about one-tenth and a half of the passenger vehicles respectively. This is why such vehicles use an auxiliary braking device, either a drivetrain retarder or an engine brake. It brings not only the safety benefit, but also the economic one, as it prolongs service intervals of friction brakes and the vehicle can go downhill at higher speed with sufficient safety reserve. As the operational vehicle fuel economy improves, the natural vehicle retarding power decreases. For this reason, the performance and torque characteristic of the auxiliary braking systems need to be improved as well. The work focuses on the development of an advanced engine brake system, which works in two-stroke cycle. The development process utilized both the simulation and experimental techniques. A project partner simultaneously proposed a new valve train design, but this development is beyond the scope of this paper. The simulation phase started with a 1-D model of a serial production heavy-duty Diesel engine, at which both the experiment and new valve train design proposal aimed. The model underwent partial calibration, mainly in terms of discharge coefficient and engine and manifold geometry, as combustion is not of interest in the engine brake mode. Parameterized advanced valve actuation in the model enabled the optimizing tool to arbitrarily modify the valve lift profiles without colliding issues. The optimizer used several constraining parameters that are given either by requirements of the valve train mechanism or have an impact on stress and durability of engine components. Resulting valve lift profiles fulfilling the constraints showed braking performance which exceeds the nominal positive power output of the engine and outdoes the contemporary 4-stroke engine brake, particularly at low engine speed. The final valve lift profiles were then inputted into the mechanical model of the proposed valve train mechanism and checked for dynamics behavior. After that, the model kinematics produced final cam profiles and technical documentation was prepared for camshafts manufacturing. The camshafts were then mounted in the engine together with the newly designed valve train mechanism designed by a project partner. Due to cost and dynamometer possibilities, the experiment had to be performed only on selected cylinders. For this reason, a numerical torsional model of the engine crank-train coupled to the dynamometer helped determine proper engine layout and safety operating points of the engine. The engine was then equipped with fast and slow sensors and data acquisition system. The subsequent experiment yielded data for further re-calibration and validation of the 1-D model. The experiment confirmed correctly proposed valve lift profiles and performance prediction and also revealed unexpected phenomena during the gas exchange process.
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Zhang, Lijun, Jie Xu y Dejian Meng. "Research on Electromagnetic Vibration and Noise Characteristics of Double-rotor Permanent Magnet Synchronous In-wheel Motor". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-adm-030.
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This paper presents a method based on the finite element simulation, the electromagnetic field, electromagnetic force, electromagnetic vibration and electromagnetic noise characteristics of a double-rotor permanent magnet synchronous in-wheel motor under multiple operating conditions are systematically studied. On the integration of previous methods, a program of multi-physics modeling and analysis of electromagnetic vibration and noise of motor is set up. Firstly, a new electromagnetic structure design of double-rotor permanent magnet synchronous in-wheel motor is proposed. Based on Maxwell stress equation, the analytical model of the radial electromagnetic force of the motor is established. The spatial domain, time domain and frequency domain analysis of the internal and external electromagnetic force and torque ripple of the double-rotor permanent magnet synchronous in-wheel motor are carried out by means of finite element simulation. Analysis shows that the radial electromagnetic force before the 5th order is mainly influential, tangential electromagnetic force before the 4th order is mainly influential. With the increasing of order, the amplitude is gradually reduced. The amplitude of the first order is the highest. According to the different modeling methods of stator windings, four finite element models in 3D structural field are designed for the double-rotor permanent magnet synchronous in-wheel motor. Then, the effects of quality and stiffness of the effective length and end of stator windings on the stator modal frequency are summarized and compared. The results show that the effect of winding mass and stiffness on the overall modal frequency of the stator is nearly canceled. After that, the 3D structural field model of the double-rotor permanent magnet synchronous in-wheel motor is used to simulate the transient dynamics under radial concentrated force loading. Based on the simulation results, the inner and outer lateral deformation of stator is analyzed in time domain and frequency domain. Finally, the harmonic response analysis of 3D structural field model of the double-rotor permanent magnet synchronous in-wheel motor is proposed, and the 3D sound field boundary element model of electromagnetic noise is established. The acoustic boundary element analysis under multiple operating conditions is carried out, including sound pressure analysis of stator surface, sound pressure analysis of field point and analysis of sound pressure frequency response characteristics at different field points. The results show that the electromagnetic noise of motor is more sensitive to the high frequency excitation, and the sensitivity of the electromagnetic noise in the radial position is significantly larger than that of the axial position. The analysis process proposed in this paper can provide support for the prediction, optimization and analysis of influencing factors of electromagnetic vibration and noise during the period of motor design.
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Horenin, Jindrich, Antonin Mikulec, Jan Macek, Jan Banecek y Josef Morkus. "Semi-automatic Design Assistance System for Vehicle Future Powertrains". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-dgt-018.
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"The current situation in accelerated research and development of environmentally friendly powertrains for future mobility needs calls for compromising mix of well-proven best practices of prime movers, based on renewable energy resources, and implementation of electric components, realizing energy recuperation and harvesting and increasing vehicle flexibility. In-time decision for best concept of a vehicle has to be based on societal needs, regulation requirements and customer acceptance combined with technologically realizable concepts. While the technology options are investigated during well known V-shape process, the other factors create a “roof“ above it, adding A-shape process over V-one. The A-shape process features the upper root with general society demands, followed by more specific constraints for future concepts of vehicles on left-hand branch, addressing environmental impacts, safety&security, total cost of ownership, etc. On the right-hand side, it adds the market and public reactions to a new product. The initial decision on vehicle concept has to be done at early stage of development, which is possible if model-based process is front-loaded at both levels of V and A. The paper describes the principles and practical elaboration of the DASY – Design Assistance System, consisting of two combined aids: OntoDASY offering qualitative hints in Wiki-like information system and DASY, focused on linking currently available software sources and in-house generated database of/for design solutions. The parametric model of a vehicle powertrain consists of different types of engines, gearboxes and electric machines including paradigms for design solution examples. E.g., the current databases contain more than 300 engines with all main components of different concepts in parametrized form. The databases are automatically extended if new design output is finished. The data from engine and component dimension databases are used to fix the overall powertrain concept, its layout and to elaborate it into the component designs, already with specific dimensional parameters. The 3D models of the vehicle powertrain concepts are created in the 3D CAD program using parametric designing, which yields flexibility for further iterative changes. The components are assembled to the models of powertrain mechanisms including tools to determine loads of all components combining 1D thermo/aerodynamics with 3D FEM stress and temperature simulations. Each component of the 3D powertrain model contains material properties, boundary conditions for loads, and finite element mesh to quickly check safety factors in operation and to optimize component shapes by iterative process. The choice of the best concept for detailed elaboration is based on the comparison of previously optimized cases, which enhances the probability of correct decision. The system avoids “invention of invented” losses, conserves the experience collected in the past (important due to design and research staff fluctuation) and supports holistic view on all product development stages. It accelerates the pre-design phase of new powertrains significantly. "
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de Borba, Thiago, Ondrej Vaculin Ondrej Vaculin y Parth Patel Parth Patel. "Concept of a Vehicle Platform for Development and Testing of Low-Speed Automated Driving Functions". En FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2021-acm-118.
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"The development of automated driving functions belongs among the most complex tasks, which have been focused on by academia and industry in the recent decade. The advantages of automated driving are enabled by achievements in many levels, such as the development of sensors, object tracking algorithms, car2x communication, planning and decision, and many others. Automated driving should contribute to a higher level of safety by reducing human driving errors, reduced congestion, CO2 emissions by optimizing the traffic flow, and finally lower stress and higher comfort for the vehicle occupants. It will also bring a new business model in the area of mobility. These benefits are possible due to the wide development of new technologies and the posterior tests required for validation on the system and sub-system levels. This paper presents an open vehicle platform for the development and testing of automated driving functions and their applications. They range from driving functions for SAE level 2, in which the driver is present and must monitor the environment to higher levels such as automated valet parking. Another application field is connected with the teleoperated driving based on efficient c2i communication. The platform is based on a production vehicle Renault Twizy extended with a drive-by-wire system for actuation and control of longitudinal and lateral dynamics connected through the low-level drive-by-wire controller by CAN bus to the control devices. The open vehicle interface enables to approach of the actuators from different HW and AW configurations. The universal sensor mounts on the modified car body enable flexible modification of sensor configuration. The vehicle can be equipped with a LIDAR and up to 8 cameras and can also be extended with radars, GNSS, and ultrasonic sensors. It also contains an in-vehicle computer, which processes, in real-time, all the detection data of the environment and outputs the desired commands to the drive by wire control unit. The open software interface, in this case, an open-source autonomous driving stack, provides predefined modules for perception, decision, and planning. Additionally, it allows users to implement their own modules. In the perception module, the LIDAR is responsible for localization, through prerecorded point cloud maps, detection, and tracking of objects in the surrounding. For instance, it is also possible to perform sensor fusion with camera data for object recognition. With this data, the system provides the best trajectory and can avoid unexpected obstacles. After all, the software outputs a set of velocity, angular velocity, wheel angle, and curvature, which is transferred by CAN bus to the drive-by-wire low-level controller. Then, the low-level controller sends the commands to the actuators."