494 research outputs found

    Design of a high-torque machine with two integrated motors axes reducing the electric vehicle consumption

    Get PDF
    The motorization of electric vehicle needs to work at a constant power on a wide range of speed. In order to be able to satisfy these requirements, we describe in this paper a solution, which consists in modifying of a simple structure of a permanent magnet motor by a double rotor structure integrating two motor axes into the same machine. This article describes, then, a design methodology of a permanent magnet motor with double rotor, radial flux, and strong starting torque for electric vehicles. This work consists on the analytical dimensioning of the motor by taking into account several operation constraints followed by a modelling by the finite elements method. This study is followed by the comparison between this motor and a motor with one rotor. A global model of the motor- converter is developed for the purpose to answer several optimisation problem

    The associations between mental well-being and adherence to physical activity guidelines in patients with cardiovascular disease: Results from the scottish health survey

    Get PDF
    The association between physical activity (PA) and mental well-being in individuals with a cardiovascular disease (CVD) is poorly studied. The objective of this study was to assess the association between mental well-being and adherence to the recommended guidelines for PA in a Scottish adult population with CVD. The study used data from 3128 adults who had CVD conditions (1547 men and 1581 women; mean age 63.29 years) who participated in the Scottish Health Survey between 2014 and 2017. The Warwick–Edinburgh Mental Well-Being Scale (WEMWBS) was used as a surrogate measure of mental health. PA was classified as “met” or “unmet” on the basis of the recommended PA guidelines (150 min of moderate activity or 75 min of vigorous activity per week). The relationship between PA guidelines being met and the WEMWBS score was explored using hierarchical linear regression accounting for a set of health and sociodemographic characteristics. Of the participants, ~41.8% met the recommended PA levels. Among those with CVD, the mean (SD) WEMWBS scores of individuals who did not have a long-standing illness (51.14 ± 7.65 vs 47.07 ± 9.54; p < 0.05), diabetes (48.44 ± 9.05 vs 46.04 ± 10.25; p < 0.05), or high blood pressure (48.63 ± 9.08 vs 47.52 ± 9.47; p < 0.05) were significantly higher than those of individuals with such conditions. Meeting PA recommendations was significantly associated with a higher mean WEMWBS score (50.64 ± 7.97 vs 46.06 ± 9.75; p < 0.05). Multiple regression analysis of health-related behaviors improved the prediction of mental well-being over and above meeting the recommended PA levels. Mental well-being was strongly correlated with PA adherence in CVD patients. It seems that for patients with CVD, PA should be tailored to meet patients’ health conditions in order to promote mental well-being and improve overall healthFunding: This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. The Scottish Health Survey is funded by the Scottish Executive. The funders had no role in the present study

    Effect of verbal instruction on motor learning ability of anaerobic and explosive exercises in physical education university students

    Get PDF
    This study investigated the effect of motor learning with informational feedback into response to anaerobic exercises with and without motor learning tasks in handball physical education university students. Participants were randomly divided into two groups: experimental group (EG, n = 10) and control group (CG, n = 10). Measurements of T-half test, 15-m and 30-m sprints, and ZIG-ZAG test were assessed in both groups before (T1), between (T2) a 4-week intervention program, and after (T3) an 8-week intervention program, which included agility and speed teaching with (EG) or without (CG) informational feedback (i.e., verbal instruction). The test-retest reliability for all tests was excellent, and the ICC ranged from 0.76 (ZIG-ZAG test) to 0.99 (Agility T test). The interday measurement error was clearly below 1% in all tests (CV range: 0.2–0.8). Time effects for the Agility T test (p = 0.012, η2p = 0.245) and the 15-m sprint (p = 0.035, η2p = 0.190) were found. For the Agility T test, a total interaction effect (p = 0.001, η2p = 0.380) and a partial interaction effect were calculated between T2 and T3 (p < 0.001, η2p = 0.603). A large effect size (d = 0.87) was observed in the EG from T2 to T3. The second relevant (d ≄ 0.5) effect size was calculated for the parameter sprint 30 m. The CG showed a significant sprint performance reduction from T2 to T3 (d = −0.60; parameter: sprint 30 m). All other effect sizes were less than 0.44. The ZIG-ZAG test revealed the largest main and partial effect sizes for all parameters. The EG showed the largest improvement (d = 2.00) between T2 and T3. The results demonstrate that motor learning with informational feedback improves performances of Agility T test, sprint, and ZIG-ZAG performance. It appears that a well-formulated verbal instruction may induce performance enhancement in young trainees in educational environment.The publication of this article was funded by the Qatar National Library. We thank Professor Mohamed Souhaiel Chelly [Research Unit (UR17JS01) “Sport Performance, Health & Society,” Higher Institute of Sport and Physical Education of Ksar Said, University of “La Manouba,” Tunisia] for his valuable experimental help

    Visualization of Distributed Algorithms Based on Graph Relabelling Systems1 1This work has been supported by the European TMR research network GETGRATS, and by the “Conseil RĂ©gional d' Aquitane”.

    Get PDF
    AbstractIn this paper, we present a uniform approach to simulate and visualize distributed algorithms encoded by graph relabelling systems. In particular, we use the distributed applications of local relabelling rules to automatically display the execution of the whole distributed algorithm. We have developed a Java prototype tool for implementing and visualizing distributed algorithms. We illustrate the different aspects of our framework using various distributed algorithms including election and spanning trees

    Complications orbitaires de la polypose nasosinusienne de l’enfant

    Get PDF
    La polypose nasosinusienne (PNS) est une pathologie rare chez l’enfant. La symptomatologie clinique est habituellement celle de l’adulte. Exceptionnellement, une complication locorĂ©gionale lui est rĂ©vĂ©latrice. A travers deux observations de PNS diagnostiquĂ©es suite Ă  une complication orbitaire, on discute les particularitĂ©s cliniques de cette entitĂ© ainsi que ses implications thĂ©rapeutiques. Il s’agissait de deux enfants ĂągĂ©s de 13 ans ayant Ă©tĂ© hospitalisĂ©s pour une exophtalmie unilatĂ©rale d’apparition aiguĂ«. L’examen clinique a dĂ©couvert une PNS surinfectĂ©e Ă©voquant alors le diagnostic de complication orbitaire d’origine infectieuse, confirmĂ© par l’imagerie. Le traitement a associĂ© un drainage chirurgical d’urgence de l’abcĂšs orbitaire par voie externe paracanthale interne, suivi par une corticothĂ©rapie locale. L’ethmoĂŻdectomie a Ă©tĂ© nĂ©cessaire dans un cas. L’évolution Ă©tait favorable dans les deux cas avec une stabilisation de la PNS et une absence de signes de rĂ©cidive de l’infection orbitaire

    Atrésie choanale : A propos de 29 cas

    Get PDF
    Introduction : L’atrĂ©sie choanale est une malformation congĂ©nitale rare, dont la frĂ©quence est estimĂ©e Ă  1 cas pour 5000 Ă  8000 naissances. plusieurs hypothĂšses embryologiques ont Ă©tĂ© proposĂ©es pour expliquer son origine. Le diagnostic de cette malformation est avant tout clinique.Objectifs : analyser les caractĂ©ristiques Ă©pidĂ©mio-cliniques et  paracliniques des atrĂ©sies choanales et discuter les modalitĂ©s thĂ©rapeutiques de cette malformation.MatĂ©riel et mĂ©thodes : il s'agit d'une Ă©tude rĂ©trospective Ă  propos de 29 cas d'atrĂ©sie choanale suivis au service d'Otorhinolaryngologie de l'hĂŽpital la Rabta sur une pĂ©riode de 20 ans (1990-2009).RĂ©sultats : L'Ăąge moyen de dĂ©couverte Ă©tait de 10,6 ans (1 jour - 35 ans). Une prĂ©dominance fĂ©minine a Ă©tĂ© notĂ©e. L'atrĂ©sie Ă©tait bilatĂ©rale dans 8 cas et unilatĂ©rale dans 21 cas. Un scanner du massif facial a Ă©tĂ© rĂ©alisĂ© dans 23 cas. L'atrĂ©sie Ă©tait osseuse dans 30,4 % des cas, membraneuse dans 13 % et mixte dans 56,6 %. Concernant le  traitement, on a eu recours Ă  la divulsion dans un cas, la voie  transpalatine dans 15 cas (dont 2 aprĂ©s echec divulsion premiĂšre) etla voie endonasale dans 13 cas.  Le taux de succĂšs obtenu par la voie endoscopique endonasale est Ă©valuĂ© Ă  72,72% et par la voie transpalatine Ă  71,42%. Le taux de succĂšs passe Ă  100% aprĂšs reprise chirurgicale.Conclusion : L’atrĂ©sie choanale est une pathologie qui doit ĂȘtre dĂ©pistĂ©e Ă  la pĂ©riode nĂ©onatale. L’endoscopie nasale et le scanner ont complĂštement rĂ©volutionnĂ© les approches diagnostiques et thĂ©rapeutiques de cette pathologie. La chirurgie endonasale sous guidage endoscopique est actuellement la technique de choix.Mots clĂ©s : atrĂ©sie ; choane ; chirurgie endoscopiqu

    Le cholestĂ©atome de l’oreille moyenne

    Get PDF
    Le cholestĂ©atome se prĂ©sente comme une pseudotumeur inflammatoire de type Ă©pidermique envahissant les cavitĂ©s de l’oreille moyenne et prĂ©sentant un double potentiel de desquamation en surface et de lyse osseuse en profondeur. C’est une forme particuliĂšrement agressive d’otite moyenne chronique dont le traitement est exclusivement chirurgical. Le but de cet article est de prĂ©senter une mise au point sur la prise en charge de cette pathologie en intĂ©grant les principales avancĂ©es rĂ©centes qui sont reprĂ©sentĂ©es par les progrĂšs de l’imagerie moderne qui permet de mieux cerner les extensions du cholestĂ©atome en prĂ©opĂ©ratoire et qui permet Ă©galement un suivi moins invasif en postopĂ©ratoire, l’utilisation plus rĂ©glĂ©e et mieux codifiĂ©e du cartilage et l’introduction de l’otoendoscopie.Cholesteatoma appears as an inflammatory pseudo-tumor of epidermic type invading the cavities of the middle ear and presenting a double potential of desquamation and of osteolysis. It is a particularly aggressive type of chronic otitis and surgery is its exclusive treatment. The aim of this article is to present the state of the art of disease management by integrating the main recent advances concern the progress of the modern imaging allowing more acute preoperative determination of extension of the cholesteatoma and a less invasive postoperative follow-up, the more adjusted and better codified use of the cartilage and the introduction of the otoendoscopy

    Myasthenie - spondylarthropathies: association fortuite ? A propos d’un cas et revue de la littĂ©rature

    Get PDF
    Propos Nous rapportons le cas d’un patient atteint d’une myasthĂ©nie associĂ©e Ă  une spondylarthropathie. Cette observation est originale de part sa raretĂ©, six cas seulement on Ă©tĂ© rapportĂ©s dans la littĂ©rature et le problĂšme que pose cette association : est ce qu’elle est fortuite ou impliquerait-elle d’autres facteurs gĂ©nĂ©tiques qui restent Ă  prouver ?Observation Monsieur J.H. ĂągĂ© de 32 ans, aux antĂ©cĂ©dents de myasthĂ©nie depuis 2002, Ă©tait hospitalisĂ© en avril 2004 pour polyarthrite chronique bilatĂ©rale et asymĂ©trique Ă©voluant depuis un an, touchant le poignet gauche, les inter phalangiennes proximales des 3Ăšme et 5Ăšme doigts droits et le genou droit associĂ©es Ă  des talalgiesbilatĂ©rales et une douleur des articulations sacro-iliaques. La biologie montrait un syndrome inflammatoire modĂ©rĂ©, des facteurs rhumatoĂŻdes faiblement positifs et un typage HLA B7 et B17. Le bilan radiologiquemontrait une arthrite des mains, une enthĂ©site calcanĂ©enne et permettait de suspecter une sacro-iliite bilatĂ©rale qui Ă©tait confirmĂ©e par un scanner. L’évolution Ă©tait bonne sous anti- inflammatoires nonstĂ©roĂŻdiens pendant 6 mois. Il consulte en janvier 2006 pour le mĂȘme tableau associĂ© Ă  une sĂšcheresse buccale et oculaire. Le bilan trouvait une VS Ă  20, des facteurs rhumatoĂŻdes faiblement positifs mais desAAN positifs Ă  un taux 1/160 homogĂšnes avec des anti SSA. Les radiographies standard montraient une carpite stade II gauche. L’examen ophtalmologique a confirmĂ© le syndrome sec oculaire. La biopsie des glandes salivaires accessoires a montrĂ© un syndrome de Gougerot Sjögren grade 2 de Shisholm
    • 

    corecore