25 research outputs found

    Recovery, Rehabilitation and Positive Psychology for Chronic Post-Traumatic Stress Disorder: Theoretical and Practical Aspects among French Veterans

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    Recovery, in terms of psychological health, is a complex concept that has to be distinguished from the notions of healing and remission. The latter refers to the evolutionary terms of the disease, while recovering from mental illness means to emerge from a psychiatric patient identity and regain an active and satisfying social life. It is clear from the literature that recovery is a complex and elusive concept in a global perspective. Two complementary visions coexist in literature and direct the rehabilitation interventions: a vision focused on mental illness (pathogenic approach) and a vision focused on the concept of sense of subjective well-being and positive mental health (salutogenic approach). Positive psychology studies the conditions, the processes and the actions that contribute to the flourishing or optimal functioning of individuals, groups and institutions. We present results evaluating the psychological resources which remain sustainable for these trauma-exposed soldiers according to their post-traumatic stress disorder (PTSD) symptoms and the dynamics of resource reappropriation after the military rehabilitation program, which focuses on values in action (VIA) as character strengths. They suggest that this approach might bring concepts to better conceptualize the dynamics of recovery and offer levers of action to enrich rehabilitation

    Damping coefficient estimation of a squeeze-film damper operating in a dual shaft test rig

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    Squeeze film dampers (SFD) are used to reduce dynamical loads in rotating machinery or to improve their performances in numerous industrial applications. The present paper considers the response of a dual shaft system with a SFD mounted on one of its bearings. The study is concerned with the overall system's dynamics in presence of a sealed SFD bearing with a lateral feeding groove and more specifically with the characterization of such damper in operational conditions. The design characteristics of the SFD are based on the linear approximation and the optimization w.r.t. sensitivity of appropriate eigenmodes of a numerical model of the dual shaft test rig. In order to gain more insight into the SFD operation, the experimental kinematic and pressure measurements data are processed within a numerical model of the fluid film using the short bearing approximation of the Reynolds equation and taking into account the flow into the groove. The work holds for low Reynolds number and completely sealed SFD were vapour cavitation is completely absent

    The Pseudomonas aeruginosa substrate-binding protein Ttg2D functions as a general glycerophospholipid transporter across the periplasm

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    In Pseudomonas aeruginosa, Ttg2D is the soluble periplasmic phospholipid-binding component of an ABC transport system thought to be involved in maintaining the asymmetry of the outer membrane. Here we use the crystallographic structure of Ttg2D at 2.5 Å resolution to reveal that this protein can accommodate four acyl chains. Analysis of the available structures of Ttg2D orthologs shows that they conform a new substrate-binding-protein structural cluster. Native and denaturing mass spectrometry experiments confirm that Ttg2D, produced both heterologously and homologously and isolated from the periplasm, can carry two diacyl glycerophospholipids as well as one cardiolipin. Binding is notably promiscuous, allowing the transport of various molecular species. In vitro binding assays coupled to native mass spectrometry show that binding of cardiolipin is spontaneous. Gene knockout experiments in P. aeruginosa multidrug-resistant strains reveal that the Ttg2 system is involved in low-level intrinsic resistance against certain antibiotics that use a lipid-mediated pathway to permeate through membranes

    GASCON : Gestion agro-écologique de la santé des cultures et des organismes nuisibles

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    Le croisement des sciences agronomiques, de l’écologie appliquĂ©e Ă  la gestion des agroĂ©cosystĂšmes,et des sciences humaines et sociales, qu’implique la transition agroĂ©cologique, pose de nouveaux dĂ©fis pour rĂ©pondre aux enjeux agricoles: intĂ©grer des connaissances de diffĂ©rentes disciplines et produites Ă  diffĂ©rentes Ă©chelles d’organisation pour agir en situation; dĂ©velopper des cadres d’analyse et dĂ©marches intĂ©grant la diversitĂ© de situations Ă  gĂ©rer par les acteurs et permettant de construire des rĂ©ponses adaptĂ©es Ă  chaque situation; et concevoir et mettre en Ɠuvre des pratiques d’enseignement et d’apprentissage, qui dotent les apprenants de capacitĂ©s Ă  penser leur action en contexte, en mobilisant des savoirs et savoir-faire multiples en termes de contenus disciplinaires et des savoir-ĂȘtre pour construire des solutions avec une diversitĂ© d’acteurs. Dans le champ de la formation, ces dĂ©fis nĂ©cessitent dĂšs lors de revisiter les contenus des enseignements dispensĂ©s, les modalitĂ©s pĂ©dagogiques et les dispositifs de formation existants, de maniĂšre Ă  apprĂ©hender au mieux la complexitĂ© des processus Ă  l’Ɠuvre. Pour autant, peu de travaux s’attardent sur les modalitĂ©s pratiques de ce changement et de ses implications, alors mĂȘme que de nombreuses initiatives en matiĂšre de pĂ©dagogie et d’agroĂ©cologie se dĂ©veloppent ces derniĂšres annĂ©es. L’objectif de ce sĂ©minaire est de promouvoir une information partagĂ©e et l’échange d’expĂ©riences pour rĂ©pondre aux enjeux posĂ©s par l’agroĂ©cologie dans la formation (transversalitĂ©, pluridisciplinaritĂ©, approche systĂ©mique, pĂ©dagogies actives). Ces enjeux peuvent se dĂ©cliner suivant plusieurs entrĂ©es : les thĂ©matiques enseignĂ©es (agriculture, Ă©levage, territoire, alimentation, ...); les pratiques et les dispositifs pĂ©dagogiques mis en Ɠuvre pour aborder ces questions (enseignement numĂ©rique, dispositifs expĂ©rimentaux, projets professionnels, rĂ©fĂ©rentiels, ...);les publics d’apprenants: Ă©lĂšves, Ă©tudiants, professionnels, ..

    Altimetry for the future: Building on 25 years of progress

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    In 2018 we celebrated 25 years of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and provides guidance for future mission design, research activities, and sustainable operational radar altimetry data exploitation. Recommendations provided are fundamental for optimizing further scientific and operational advances of oceanographic observations by altimetry, including requirements for spatial and temporal resolution of altimetric measurements, their accuracy and continuity. There are also new challenges and new openings mentioned in the paper that are particularly crucial for observations at higher latitudes, for coastal oceanography, for cryospheric studies and for hydrology. The paper starts with a general introduction followed by a section on Earth System Science including Ocean Dynamics, Sea Level, the Coastal Ocean, Hydrology, the Cryosphere and Polar Oceans and the ‘‘Green” Ocean, extending the frontier from biogeochemistry to marine ecology. Applications are described in a subsequent section, which covers Operational Oceanography, Weather, Hurricane Wave and Wind Forecasting, Climate projection. Instruments’ development and satellite missions’ evolutions are described in a fourth section. A fifth section covers the key observations that altimeters provide and their potential complements, from other Earth observation measurements to in situ data. Section 6 identifies the data and methods and provides some accuracy and resolution requirements for the wet tropospheric correction, the orbit and other geodetic requirements, the Mean Sea Surface, Geoid and Mean Dynamic Topography, Calibration and Validation, data accuracy, data access and handling (including the DUACS system). Section 7 brings a transversal view on scales, integration, artificial intelligence, and capacity building (education and training). Section 8 reviews the programmatic issues followed by a conclusion

    Altimetry for the future: building on 25 years of progress

    Get PDF
    In 2018 we celebrated 25 years of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and provides guidance for future mission design, research activities, and sustainable operational radar altimetry data exploitation. Recommendations provided are fundamental for optimizing further scientific and operational advances of oceanographic observations by altimetry, including requirements for spatial and temporal resolution of altimetric measurements, their accuracy and continuity. There are also new challenges and new openings mentioned in the paper that are particularly crucial for observations at higher latitudes, for coastal oceanography, for cryospheric studies and for hydrology. The paper starts with a general introduction followed by a section on Earth System Science including Ocean Dynamics, Sea Level, the Coastal Ocean, Hydrology, the Cryosphere and Polar Oceans and the “Green” Ocean, extending the frontier from biogeochemistry to marine ecology. Applications are described in a subsequent section, which covers Operational Oceanography, Weather, Hurricane Wave and Wind Forecasting, Climate projection. Instruments’ development and satellite missions’ evolutions are described in a fourth section. A fifth section covers the key observations that altimeters provide and their potential complements, from other Earth observation measurements to in situ data. Section 6 identifies the data and methods and provides some accuracy and resolution requirements for the wet tropospheric correction, the orbit and other geodetic requirements, the Mean Sea Surface, Geoid and Mean Dynamic Topography, Calibration and Validation, data accuracy, data access and handling (including the DUACS system). Section 7 brings a transversal view on scales, integration, artificial intelligence, and capacity building (education and training). Section 8 reviews the programmatic issues followed by a conclusion

    Le rÎle protecteur clé de la pleine conscience dans la prévention du trouble de stress post traumatique

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    PTSD is a common chronic and debilitating disease. Curative treatments are only partially effective and prevention programs are not very "formalized". Mindfulness brings benefits in pathologies linked to stress. Our main goal is to show the key protective role of mindfulness against PTSD. The expected clinical benefit is the integration of mindfulness into PTSD prevention programs. We ask two main questions. Question 1: Is mindfulness a key protective factor in the progression of PTSD? The theoretical framework for answering this first question is that of a prospective cohort study on 133 subjects for 54 months (BV13). We conclude that mindfulness is a strong and constant protective factor from 6 to 54 months. The adjusted odds ratios are 0.81 (six months), 0.88 (18 months), 0.82 (30 months), and 0.81 (54 months). They are all significant. Question 2: Is mindfulness a modifiable protective factor in PTSD? The theoretical framework for answering this second question is that of a randomized controlled therapeutic trial including 34 subjects during a 10-day internship in Guadeloupe. One group did a mindful diving course. The control group carried out a multisport course. We conclude that mindfulness is a modifiable protective factor in PTSD, but that it requires constant training for this improvement to be sustained over time. During our journey, within the framework of primary, secondary and tertiary prevention of PTSD we also answer the following subsidiary questions: How is the prevalence of PTSD changing? The prevalence of PTSD at 6 months rises to 74% at 6 months and then declines steadily over time, but remains at 42% at 54 months. How to characterize the progression from ASD to PTSD? ASD would be a separate entity, females would be more susceptible to it, and the free interval between ASD and PTSD could be one to six months long. What are the other risk factors for developing PTSD? Social support is a protective factor after 18 months. Severe acute stress disorder and peri-traumatic dissociation are risk factors for PTSD at six months and 18 months, respectively. Does mindfulness protect against an additional element of stress? Mindfulness is a protective factor in the face of external stressors similar to the health crisis linked to COVID-19. PTSD mediates the relationship between mindfulness disposition and the level of stress caused by the COVID-19 health crisis. How to characterize the addictive and somatic comorbidities of PTSD? PTSD is a risk factor for developing an Alcohol Use Disorder. The number of somatic pathologies perceived as a consequence of PTSD is proportional to the PCL-5 score. How to model the dynamic evolution of PTSD? The Bayesian paradigm lays the foundations for modeling PTSD including as a primary parameter the mindfulness disposition of the individual. Stochastic models could be used to model the psychiatric impact of a terrorist attack type event. They would integrate the different risk factors as parameters and in particular mindfulness. Overall, mindfulness is a strong protective factor for PTSD that may be relevant to integrate into primary, secondary and tertiary prevention programs.Le TSPT est une maladie frĂ©quente chronique et invalidante. Les traitements curatifs ne sont que partiellement efficaces et les programmes de prĂ©vention peu « protocolisĂ©s ». La pleine conscience apporte des bĂ©nĂ©fices dans les pathologies liĂ©es au stress. Notre objectif principal est de montrer le rĂŽle protecteur clĂ© de la pleine conscience contre le TSPT. Le bĂ©nĂ©fice clinique attendu est l’intĂ©gration de la pleine conscience dans des programmes de prĂ©vention du TSPT. Nous posons deux questions principales. Question 1 : La pleine conscience est-elle un facteur protecteur clĂ© de l’évolution du TSPT ? Le cadre thĂ©orique pour rĂ©pondre Ă  cette premiĂšre question est celui d’une Ă©tude de cohorte prospective sur 133 sujets pendant 54 mois (BV13). Nous concluons que la pleine conscience est un facteur protecteur fort et constant de 6 Ă  54 mois. Les odds ratios ajustĂ©s sont 0,81 (six mois), 0,88 (18 mois), 0,82 (30 mois), et 0,81 (54 mois). Ils sont tous significatifs. Question 2 : La pleine conscience est-elle un facteur protecteur modifiable du TSPT ? Le cadre thĂ©orique pour rĂ©pondre Ă  cette deuxiĂšme question est celui d’un essai thĂ©rapeutique randomisĂ© contrĂŽlĂ© incluant 34 sujets lors d’un stage de 10 jours en Guadeloupe. Un groupe a rĂ©alisĂ© un stage de plongĂ©e en pleine conscience. Le groupe contrĂŽle a rĂ©alisĂ© un stage multisports. Nous concluons que la pleine conscience est un facteur protecteur modifiable du TSPT mais que cela nĂ©cessite un entraĂźnement constant pour que cette amĂ©lioration s’inscrive dans le temps. Pendant notre cheminement, dans le cadre des prĂ©ventions primaire, secondaire et tertiaire du TSPT nous rĂ©pondons aussi aux questions subsidiaires suivantes : Quelle est l’évolution de la prĂ©valence du TSPT ? La prĂ©valence du TSPT Ă  6 mois s’élĂšve Ă  74 % Ă  six mois puis diminue rĂ©guliĂšrement avec le temps, mais reste Ă  42 % Ă  54 mois. Comment caractĂ©riser l’évolution du TSA au TSPT ? Le TSA serait une entitĂ© Ă  part, les individus de genre fĂ©minin y seraient plus sensibles et l’intervalle libre entre le TSA et le TSPT pourrait ĂȘtre long de un Ă  six mois. Quels sont les autres facteurs de risque de dĂ©velopper le TSPT ?Le soutien social est un facteur protecteur aprĂšs 18 mois. Le trouble de stress aigu sĂ©vĂšre et la dissociation pĂ©ri-traumatique sont des facteurs de risque du TSPT respectivement Ă  six mois et Ă  18 mois. La pleine conscience protĂšge-t-elle d’un Ă©lĂ©ment de stress supplĂ©mentaire ? La pleine conscience est un facteur protecteur face aux stresseurs externes similaires Ă  la crise sanitaire liĂ©e Ă  la COVID-19. Le TSPT est mĂ©diateur de la relation entre la disposition de pleine conscience et le niveau de stress engendrĂ© par la crise sanitaire de la COVID-19. Comment caractĂ©riser les comorbiditĂ©s addictives et somatiques du TSPT ? Le TSPT est un facteur de risque de dĂ©velopper un Trouble de l’Usage de l’Alcool. Le nombre de pathologies somatiques perçues comme une consĂ©quence du TSPT est proportionnel au score PCL-5. Comment modĂ©liser l’évolution dynamique du TSPT ? Le paradigme bayĂ©sien pose les bases d’une modĂ©lisation du TSPT incluant comme paramĂštre premier la disposition de pleine conscience de l‘individu. Les modĂšles stochastiques pourraient servir Ă  la modĂ©lisation de l’impact psychiatrique d’un Ă©vĂ©nement du type des attentats terroristes. Ils intĂ©greraient les diffĂ©rents facteurs de risque comme paramĂštres et en particulier la pleine conscience. Au total, la pleine conscience est un facteur protecteur solide du TSPT qu’il pourrait ĂȘtre pertinent d’intĂ©grer dans des programmes de prĂ©vention primaire, secondaire et tertiaire

    Le rÎle protecteur clé de la pleine conscience dans la prévention du trouble de stress post traumatique

    No full text
    PTSD is a common chronic and debilitating disease. Curative treatments are only partially effective and prevention programs are not very "formalized". Mindfulness brings benefits in pathologies linked to stress. Our main goal is to show the key protective role of mindfulness against PTSD. The expected clinical benefit is the integration of mindfulness into PTSD prevention programs. We ask two main questions. Question 1: Is mindfulness a key protective factor in the progression of PTSD? The theoretical framework for answering this first question is that of a prospective cohort study on 133 subjects for 54 months (BV13). We conclude that mindfulness is a strong and constant protective factor from 6 to 54 months. The adjusted odds ratios are 0.81 (six months), 0.88 (18 months), 0.82 (30 months), and 0.81 (54 months). They are all significant. Question 2: Is mindfulness a modifiable protective factor in PTSD? The theoretical framework for answering this second question is that of a randomized controlled therapeutic trial including 34 subjects during a 10-day internship in Guadeloupe. One group did a mindful diving course. The control group carried out a multisport course. We conclude that mindfulness is a modifiable protective factor in PTSD, but that it requires constant training for this improvement to be sustained over time. During our journey, within the framework of primary, secondary and tertiary prevention of PTSD we also answer the following subsidiary questions: How is the prevalence of PTSD changing? The prevalence of PTSD at 6 months rises to 74% at 6 months and then declines steadily over time, but remains at 42% at 54 months. How to characterize the progression from ASD to PTSD? ASD would be a separate entity, females would be more susceptible to it, and the free interval between ASD and PTSD could be one to six months long. What are the other risk factors for developing PTSD? Social support is a protective factor after 18 months. Severe acute stress disorder and peri-traumatic dissociation are risk factors for PTSD at six months and 18 months, respectively. Does mindfulness protect against an additional element of stress? Mindfulness is a protective factor in the face of external stressors similar to the health crisis linked to COVID-19. PTSD mediates the relationship between mindfulness disposition and the level of stress caused by the COVID-19 health crisis. How to characterize the addictive and somatic comorbidities of PTSD? PTSD is a risk factor for developing an Alcohol Use Disorder. The number of somatic pathologies perceived as a consequence of PTSD is proportional to the PCL-5 score. How to model the dynamic evolution of PTSD? The Bayesian paradigm lays the foundations for modeling PTSD including as a primary parameter the mindfulness disposition of the individual. Stochastic models could be used to model the psychiatric impact of a terrorist attack type event. They would integrate the different risk factors as parameters and in particular mindfulness. Overall, mindfulness is a strong protective factor for PTSD that may be relevant to integrate into primary, secondary and tertiary prevention programs.Le TSPT est une maladie frĂ©quente chronique et invalidante. Les traitements curatifs ne sont que partiellement efficaces et les programmes de prĂ©vention peu « protocolisĂ©s ». La pleine conscience apporte des bĂ©nĂ©fices dans les pathologies liĂ©es au stress. Notre objectif principal est de montrer le rĂŽle protecteur clĂ© de la pleine conscience contre le TSPT. Le bĂ©nĂ©fice clinique attendu est l’intĂ©gration de la pleine conscience dans des programmes de prĂ©vention du TSPT. Nous posons deux questions principales. Question 1 : La pleine conscience est-elle un facteur protecteur clĂ© de l’évolution du TSPT ? Le cadre thĂ©orique pour rĂ©pondre Ă  cette premiĂšre question est celui d’une Ă©tude de cohorte prospective sur 133 sujets pendant 54 mois (BV13). Nous concluons que la pleine conscience est un facteur protecteur fort et constant de 6 Ă  54 mois. Les odds ratios ajustĂ©s sont 0,81 (six mois), 0,88 (18 mois), 0,82 (30 mois), et 0,81 (54 mois). Ils sont tous significatifs. Question 2 : La pleine conscience est-elle un facteur protecteur modifiable du TSPT ? Le cadre thĂ©orique pour rĂ©pondre Ă  cette deuxiĂšme question est celui d’un essai thĂ©rapeutique randomisĂ© contrĂŽlĂ© incluant 34 sujets lors d’un stage de 10 jours en Guadeloupe. Un groupe a rĂ©alisĂ© un stage de plongĂ©e en pleine conscience. Le groupe contrĂŽle a rĂ©alisĂ© un stage multisports. Nous concluons que la pleine conscience est un facteur protecteur modifiable du TSPT mais que cela nĂ©cessite un entraĂźnement constant pour que cette amĂ©lioration s’inscrive dans le temps. Pendant notre cheminement, dans le cadre des prĂ©ventions primaire, secondaire et tertiaire du TSPT nous rĂ©pondons aussi aux questions subsidiaires suivantes : Quelle est l’évolution de la prĂ©valence du TSPT ? La prĂ©valence du TSPT Ă  6 mois s’élĂšve Ă  74 % Ă  six mois puis diminue rĂ©guliĂšrement avec le temps, mais reste Ă  42 % Ă  54 mois. Comment caractĂ©riser l’évolution du TSA au TSPT ? Le TSA serait une entitĂ© Ă  part, les individus de genre fĂ©minin y seraient plus sensibles et l’intervalle libre entre le TSA et le TSPT pourrait ĂȘtre long de un Ă  six mois. Quels sont les autres facteurs de risque de dĂ©velopper le TSPT ?Le soutien social est un facteur protecteur aprĂšs 18 mois. Le trouble de stress aigu sĂ©vĂšre et la dissociation pĂ©ri-traumatique sont des facteurs de risque du TSPT respectivement Ă  six mois et Ă  18 mois. La pleine conscience protĂšge-t-elle d’un Ă©lĂ©ment de stress supplĂ©mentaire ? La pleine conscience est un facteur protecteur face aux stresseurs externes similaires Ă  la crise sanitaire liĂ©e Ă  la COVID-19. Le TSPT est mĂ©diateur de la relation entre la disposition de pleine conscience et le niveau de stress engendrĂ© par la crise sanitaire de la COVID-19. Comment caractĂ©riser les comorbiditĂ©s addictives et somatiques du TSPT ? Le TSPT est un facteur de risque de dĂ©velopper un Trouble de l’Usage de l’Alcool. Le nombre de pathologies somatiques perçues comme une consĂ©quence du TSPT est proportionnel au score PCL-5. Comment modĂ©liser l’évolution dynamique du TSPT ? Le paradigme bayĂ©sien pose les bases d’une modĂ©lisation du TSPT incluant comme paramĂštre premier la disposition de pleine conscience de l‘individu. Les modĂšles stochastiques pourraient servir Ă  la modĂ©lisation de l’impact psychiatrique d’un Ă©vĂ©nement du type des attentats terroristes. Ils intĂ©greraient les diffĂ©rents facteurs de risque comme paramĂštres et en particulier la pleine conscience. Au total, la pleine conscience est un facteur protecteur solide du TSPT qu’il pourrait ĂȘtre pertinent d’intĂ©grer dans des programmes de prĂ©vention primaire, secondaire et tertiaire

    The key protective role of mindfulness in the prevention of post traumatic stress disorder

    No full text
    Le TSPT est une maladie frĂ©quente chronique et invalidante. Les traitements curatifs ne sont que partiellement efficaces et les programmes de prĂ©vention peu « protocolisĂ©s ». La pleine conscience apporte des bĂ©nĂ©fices dans les pathologies liĂ©es au stress. Notre objectif principal est de montrer le rĂŽle protecteur clĂ© de la pleine conscience contre le TSPT. Le bĂ©nĂ©fice clinique attendu est l’intĂ©gration de la pleine conscience dans des programmes de prĂ©vention du TSPT. Nous posons deux questions principales. Question 1 : La pleine conscience est-elle un facteur protecteur clĂ© de l’évolution du TSPT ? Le cadre thĂ©orique pour rĂ©pondre Ă  cette premiĂšre question est celui d’une Ă©tude de cohorte prospective sur 133 sujets pendant 54 mois (BV13). Nous concluons que la pleine conscience est un facteur protecteur fort et constant de 6 Ă  54 mois. Les odds ratios ajustĂ©s sont 0,81 (six mois), 0,88 (18 mois), 0,82 (30 mois), et 0,81 (54 mois). Ils sont tous significatifs. Question 2 : La pleine conscience est-elle un facteur protecteur modifiable du TSPT ? Le cadre thĂ©orique pour rĂ©pondre Ă  cette deuxiĂšme question est celui d’un essai thĂ©rapeutique randomisĂ© contrĂŽlĂ© incluant 34 sujets lors d’un stage de 10 jours en Guadeloupe. Un groupe a rĂ©alisĂ© un stage de plongĂ©e en pleine conscience. Le groupe contrĂŽle a rĂ©alisĂ© un stage multisports. Nous concluons que la pleine conscience est un facteur protecteur modifiable du TSPT mais que cela nĂ©cessite un entraĂźnement constant pour que cette amĂ©lioration s’inscrive dans le temps. Pendant notre cheminement, dans le cadre des prĂ©ventions primaire, secondaire et tertiaire du TSPT nous rĂ©pondons aussi aux questions subsidiaires suivantes : Quelle est l’évolution de la prĂ©valence du TSPT ? La prĂ©valence du TSPT Ă  6 mois s’élĂšve Ă  74 % Ă  six mois puis diminue rĂ©guliĂšrement avec le temps, mais reste Ă  42 % Ă  54 mois. Comment caractĂ©riser l’évolution du TSA au TSPT ? Le TSA serait une entitĂ© Ă  part, les individus de genre fĂ©minin y seraient plus sensibles et l’intervalle libre entre le TSA et le TSPT pourrait ĂȘtre long de un Ă  six mois. Quels sont les autres facteurs de risque de dĂ©velopper le TSPT ?Le soutien social est un facteur protecteur aprĂšs 18 mois. Le trouble de stress aigu sĂ©vĂšre et la dissociation pĂ©ri-traumatique sont des facteurs de risque du TSPT respectivement Ă  six mois et Ă  18 mois. La pleine conscience protĂšge-t-elle d’un Ă©lĂ©ment de stress supplĂ©mentaire ? La pleine conscience est un facteur protecteur face aux stresseurs externes similaires Ă  la crise sanitaire liĂ©e Ă  la COVID-19. Le TSPT est mĂ©diateur de la relation entre la disposition de pleine conscience et le niveau de stress engendrĂ© par la crise sanitaire de la COVID-19. Comment caractĂ©riser les comorbiditĂ©s addictives et somatiques du TSPT ? Le TSPT est un facteur de risque de dĂ©velopper un Trouble de l’Usage de l’Alcool. Le nombre de pathologies somatiques perçues comme une consĂ©quence du TSPT est proportionnel au score PCL-5. Comment modĂ©liser l’évolution dynamique du TSPT ? Le paradigme bayĂ©sien pose les bases d’une modĂ©lisation du TSPT incluant comme paramĂštre premier la disposition de pleine conscience de l‘individu. Les modĂšles stochastiques pourraient servir Ă  la modĂ©lisation de l’impact psychiatrique d’un Ă©vĂ©nement du type des attentats terroristes. Ils intĂ©greraient les diffĂ©rents facteurs de risque comme paramĂštres et en particulier la pleine conscience. Au total, la pleine conscience est un facteur protecteur solide du TSPT qu’il pourrait ĂȘtre pertinent d’intĂ©grer dans des programmes de prĂ©vention primaire, secondaire et tertiaire.PTSD is a common chronic and debilitating disease. Curative treatments are only partially effective and prevention programs are not very "formalized". Mindfulness brings benefits in pathologies linked to stress. Our main goal is to show the key protective role of mindfulness against PTSD. The expected clinical benefit is the integration of mindfulness into PTSD prevention programs. We ask two main questions. Question 1: Is mindfulness a key protective factor in the progression of PTSD? The theoretical framework for answering this first question is that of a prospective cohort study on 133 subjects for 54 months (BV13). We conclude that mindfulness is a strong and constant protective factor from 6 to 54 months. The adjusted odds ratios are 0.81 (six months), 0.88 (18 months), 0.82 (30 months), and 0.81 (54 months). They are all significant. Question 2: Is mindfulness a modifiable protective factor in PTSD? The theoretical framework for answering this second question is that of a randomized controlled therapeutic trial including 34 subjects during a 10-day internship in Guadeloupe. One group did a mindful diving course. The control group carried out a multisport course. We conclude that mindfulness is a modifiable protective factor in PTSD, but that it requires constant training for this improvement to be sustained over time. During our journey, within the framework of primary, secondary and tertiary prevention of PTSD we also answer the following subsidiary questions: How is the prevalence of PTSD changing? The prevalence of PTSD at 6 months rises to 74% at 6 months and then declines steadily over time, but remains at 42% at 54 months. How to characterize the progression from ASD to PTSD? ASD would be a separate entity, females would be more susceptible to it, and the free interval between ASD and PTSD could be one to six months long. What are the other risk factors for developing PTSD? Social support is a protective factor after 18 months. Severe acute stress disorder and peri-traumatic dissociation are risk factors for PTSD at six months and 18 months, respectively. Does mindfulness protect against an additional element of stress? Mindfulness is a protective factor in the face of external stressors similar to the health crisis linked to COVID-19. PTSD mediates the relationship between mindfulness disposition and the level of stress caused by the COVID-19 health crisis. How to characterize the addictive and somatic comorbidities of PTSD? PTSD is a risk factor for developing an Alcohol Use Disorder. The number of somatic pathologies perceived as a consequence of PTSD is proportional to the PCL-5 score. How to model the dynamic evolution of PTSD? The Bayesian paradigm lays the foundations for modeling PTSD including as a primary parameter the mindfulness disposition of the individual. Stochastic models could be used to model the psychiatric impact of a terrorist attack type event. They would integrate the different risk factors as parameters and in particular mindfulness. Overall, mindfulness is a strong protective factor for PTSD that may be relevant to integrate into primary, secondary and tertiary prevention programs

    Influence of a sealed Squeeze Film damper on rotor dynamics : experimental analysis

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    The system studied is a dual-shaft rotor on which one is mounted a Squeeze Film Damper (SqF) equipped with two piston ring seals. Feeding pressure effects on the overall dynamics are shown, especially on the response level at critical speeds, their frequency positions and corresponding deformed shapes. Physical phenomena present inside the SqF and explaining the observed effects are analyzed. The use of a suitable feeding pressure for each critical speed crossed over during the run-up is shown
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