3,679 research outputs found

    Toplogical derivative for nonlinear magnetostatic problem

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    The topological derivative represents the sensitivity of a domain-dependent functional with respect to a local perturbation of the domain and is a valuable tool in topology optimization. Motivated by an application from electrical engineering, we derive the topological derivative for an optimization problem which is constrained by the quasilinear equation of two-dimensional magnetostatics. Here, the main ingredient is to establish a sufficiently fast decay of the variation of the direct state at scale 1 as x|x|\rightarrow \infty. In order to apply the method in a bi-directional topology optimization algorithm, we derive both the sensitivity for introducing air inside ferromagnetic material and the sensitivity for introducing material inside an air region. We explicitly compute the arising polarization matrices and introduce a way to efficiently evaluate the obtained formulas. Finally, we employ the derived formulas in a level-set based topology optimization algorithm and apply it to the design optimization of an electric motor.Comment: 54 pages, 9 figure

    Career Readiness: A Study of Vietnamese University Students\u27 Views on Post-Graduation Prospects

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    This study examines Vietnamese university students\u27 perceptions and attitudes towards post-graduation job prospects, which could serve as an economic indicator. Utilizing survey data from over 200 students across institutions and disciplines, the research investigates how factors such as confidence in educational preparation, chosen field of study, and perceived job readiness relate to demographic characteristics and intentions to pursue the same academic path. The most significant findings of the study reveal that English language confidence and major fields of study were influential factors in shaping students\u27 perceptions and attitudes. Students with higher English confidence had statistically significantly higher levels of job market confidence, and significant differences in confidence levels were found across major groups, with students in the Social Sciences exhibiting lower confidence compared to those in Business/Economics, Linguistics, and Other majors. A linear regression analysis confirmed the positive relationship between English language confidence and job market confidence. The study highlights influential factors shaping students\u27 confidence levels and attitudes, offering insights for supporting education-to-workforce transitions. As students\u27 confidence in future employment opportunities could bode well for economic growth, the research contributes to understanding Vietnamese students\u27 career aspirations and perceived job readiness. The findings provide actionable insights for policymakers, educators, and career counselors to develop targeted interventions and support programs that address the specific needs of different student groups, ultimately benefiting the nation\u27s economic development

    From Deterrence to Defense: The Inside Story of Strategic Policy

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    U.S. Farm Policy and International Agricultural Markets

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    Calf Diseases

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    If a dairy calf reaches one month of age in a strong, vigorous condition, the dairyman has won a major portion of the battle to place the animal in the milking line. Of course, many factors can interfere at a later date, but the calf will be much better able to combat disease, parasites and injuries if it has a reserve of strength to carry it through whatever may affect it. You have all had to give an unfavorable prognosis because the animal in question was in poor general health before the immediate condition developed

    U.S. Farm Policy and International Agricultural Markets

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    Devoirs à domicile différenciés :: comment les instaurer et quelle en est la perception d’enseignants jurassiens ?

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    Ce travail de mémoire est basé sur la thématique des devoirs à domicile. En effet, il s’agit d’un thème très important, qui fait débat depuis plusieurs années maintenant, car beaucoup de personnes s’interrogent sur leur finalité. À cet effet, je me suis intéressée à une pratique très peu connue, qui est celle des devoirs à domicile différenciés. En effet, même si la différenciation est une pratique très actuelle dans les écoles jurassiennes, elle n’est pas présente lors de la distribution des devoirs à domicile. Afin de répondre aux diverses interrogations ayant trait à cette thématique, j’ai introduit cette pratique dans une classe de 4ème année, afin d’en observer les effets. Par conséquent, il a fallu réfléchir à toutes les modalités à mettre en place pour que cette manière de fonctionner puisse être avantageuse pour les élèves. Au terme de cette expérimentation, j’ai comparé mes résultats avec les avis de deux enseignantes, travaillant dans le même degré
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