506 research outputs found
Design of a high-torque machine with two integrated motors axes reducing the electric vehicle consumption
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
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 WarwickâEdinburgh Mental Well-Being Scale (WEMWBS) was used as a surrogate measure of mental health. PA was classified as âmetâ or âunmetâ 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 patientsâ 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
Electrochemical behavior of Auramine O dye in aqueous solutions at lead dioxide electrode
Electrochemical behavior of Auramine O (AO) was studied by galvanostatic electrolysis at lead dioxide (Ta/PbO2) anodes. The influence of operating parameters, such as current density, initial concentration of AO, temperature and initial pH value was investigated. The oxidation kinetics of the AO was followed by HPLC, UV / visible spectrophotometry and the measurement of chemical oxygen demand (COD). The experimental results showed that the electrochemical process was suitable for almost completely removing COD, due to the production of the hydroxyl radicals at the anode surface. The oxidation of AO is dependent on its initial concentration, current density, temperature and pH. COD decay follows a pseudo first-order kinetic and the process was under mass transport control. The HPLC analysis showed that the main AO oxidation products formed during electrolysis are the hydroquinone (HQ) representing the reduced form of benzoquinone (BQ) and carboxylic acids (CA). The proposed AO anodic oxidation into (BQ) is mainly based on an alternance of indirect monoelectronic discharge by the mediation of hydroxyl radicals and hydrolysis steps. The electrochemical oxidation of AO can be used as an economically adequate way for a pre-treatment of waters containing this dye followed by biological treatment
Effect of verbal instruction on motor learning ability of anaerobic and explosive exercises in physical education university students
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: 0.2â0.8). 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 â„ 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 = â0.60; 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) âSport Performance, Health & Society,â Higher Institute of Sport and Physical Education of Ksar Said, University of âLa Manouba,â Tunisia] for his valuable experimental help
Bacillus thuringiensis:un biopesticide environnemental (SynthĂšse Bibliographique)
La bactĂ©rie entomopathogĂšne Bacillus thuringiensis(Bt) a Ă©tĂ© le premier micro-organisme homologuĂ© dans le monde comme biopesticide Ă cause de son action spĂ©cifique et son innocuitĂ© pour lâhomme et les animaux. LâactivitĂ© entomopathogĂšne de Bt est principalement due Ă la synthĂšse des protĂ©ines Cry pendant la phase de sporulationqui forment des inclusions cristallines et qui peuvent ĂȘtre accompagnĂ©es par des protĂ©ines cytolytiques Cyt. Elle peut produire Ă©galement les bioinsecticides Vip secrĂ©tĂ©s (Vip : VegetativeInsecticidalProteins) durant la phase vĂ©gĂ©tative, ainsi quediffĂ©rents autres facteurs de virulence. Toutes ces toxines synthĂ©tisĂ©es sont trĂšs actives contre une large gamme dâinsectes parmi lesquels les lĂ©pidoptĂšres, les diptĂšres et les colĂ©optĂšres.Si actuellement, Btest le microorganisme le plus utilisĂ© dans le marchĂ© des biopesticides, c'est parce que cette bactĂ©rie se multiplie facilement en fermenteurs et ses produits formulĂ©s se conservent pour de longues durĂ©es. En plus, les biopesticides Ă base de Bt sont trĂšs sĂ©lectifs et prĂ©sententdes prix de revient compĂ©titifs
Complications orbitaires de la polypose nasosinusienne de lâenfant
La polypose nasosinusienne (PNS) est une pathologie rare chez lâenfant. La symptomatologie clinique est habituellement celle de lâadulte. 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 sâagissait de deux enfants ĂągĂ©s de 13 ans ayant Ă©tĂ© hospitalisĂ©s pour une exophtalmie unilatĂ©rale dâapparition aiguĂ«. Lâexamen clinique a dĂ©couvert une PNS surinfectĂ©e Ă©voquant alors le diagnostic de complication orbitaire dâorigine infectieuse, confirmĂ© par lâimagerie. Le traitement a associĂ© un drainage chirurgical dâurgence de lâabcĂšs orbitaire par voie externe paracanthale interne, suivi par une corticothĂ©rapie locale. LâethmoĂŻdectomie a Ă©tĂ© nĂ©cessaire dans un cas. LâĂ©volution Ă©tait favorable dans les deux cas avec une stabilisation de la PNS et une absence de signes de rĂ©cidive de lâinfection orbitaire
Visualization of Distributed Algorithms Based on Graph Relabelling Systems1 1This work has been supported by the European TMR research network GETGRATS, and by the âConseil RĂ©gional d' Aquitaneâ.
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
Atrésie choanale : A propos de 29 cas
Introduction : LâatrĂ©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 : LâatrĂ©sie choanale est une pathologie qui doit ĂȘtre dĂ©pistĂ©e Ă la pĂ©riode nĂ©onatale. Lâendoscopie 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 lâoreille moyenne
Le cholestĂ©atome se prĂ©sente comme une pseudotumeur inflammatoire de type Ă©pidermique envahissant les cavitĂ©s de lâoreille moyenne et prĂ©sentant un double potentiel de desquamation en surface et de lyse osseuse en profondeur. Câest une forme particuliĂšrement agressive dâotite 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 lâimagerie 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, lâutilisation plus rĂ©glĂ©e et mieux codifiĂ©e du cartilage et lâintroduction de lâotoendoscopie.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 dâun cas et revue de la littĂ©rature
Propos Nous rapportons le cas dâun patient atteint dâune 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 quâelle est fortuite ou impliquerait-elle dâautres 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. LâĂ©volution 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. Lâexamen ophtalmologique a confirmĂ© le syndrome sec oculaire. La biopsie des glandes salivaires accessoires a montrĂ© un syndrome de Gougerot Sjögren grade 2 de Shisholm
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