891 resultados para Hands-on experiments


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Natural convection heat transfer from a heat generating horizontal cylinder enclosed in a square cavity, where a temperature difference exists across its vertical walls has been experimentally investigated for the range 2×104

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Transport of fast electrons driven by an ultraintense laser through a tracer layer buried in solid targets is studied by particle-in-cell simulations. It is found that intense resistive magnetic fields, having a magnitude of several thousand Tesla, are generated at the interfaces of the materials due to the steep resistivity gradient between the target and tracer layer. Such magnetic fields can significantly inhibit the fast electron propagation. The electrons that can penetrate the first interface are mostly confined in the buried layer by the magnetic fields and cause heating of the tracer layer. The lateral extent of the heated region can be significantly larger than that of the relativistic electron beam. This finding suggests that the relativistic electron divergence inferred from Ká x-ray emission in experiments might be overestimated.

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In discrete choice experiments respondents are generally assumed to consider all of the attributes across each of the alternatives, and to choose their most preferred. However, results in this paper indicate that many respondents employ simplified lexicographic decision-making rules, whereby they have a ranking of the attributes, but their choice of an alternative is based solely on the level of their most important attribute(s). Not accounting for these simple decision-making heuristics introduces systemic errors and leads to biased point estimates, as they are a violation of the continuity axiom and a departure from the use of compensatory decision-making. In this paper the implications of lexicographic preferences are examined. In particular, using a mixed logit specification this paper investigates the sensitivity of individual-specific willingness to pay (WTP) estimates conditional on whether lexicographic decision-making rules are accounted for in the modelling of discrete choice responses. Empirical results are obtained from a discrete choice experiment that was carried out to address the value of a number of rural landscape attributes in Ireland

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Glass fibre-reinforced plastics (GFRP) have been considered inherently difficult to recycle due to both: cross-linked nature of thermoset resins, which cannot be remolded, and complex composition of the composite itself. Presently, most of the GFRP waste is landfilled leading to negative environmental impacts and supplementary added costs. With an increasing awareness of environmental matters and the subsequent desire to save resources, recycling would convert an expensive waste disposal into a profitable reusable material. In this study, efforts were made in order to recycle grinded GFRP waste, proceeding from pultrusion production scrap, into new and sustainable composite materials. For this purpose, GFRP waste recyclates, were incorporated into polyester based mortars as fine aggregate and filler replacements at different load contents and particle size distributions. Potential recycling solution was assessed by mechanical behaviour of resultant GFRP waste modified polymer mortars. Results revealed that GFRP waste filled polymer mortars present improved flexural and compressive behaviour over unmodified polyester based mortars, thus indicating the feasibility of the waste reuse in polymer mortars and concrete. © 2011, Advanced Engineering Solutions.

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Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal

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Rapport de stage présenté à l'école de Criminologie de la Faculté des arts et sciences en vue de l'obtention du grade de Maître ès sciences (M.Sc.) en criminologie option analyse criminologique

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Con diferentes tipos de texto y letra se presenta la información sobre el cuerpo humano y los experimentos que deben realizarse para comprobar, entre otras cosas, la talla, relación entre el olfato y el gusto, cómo se mueven los músculos. Adecuado para la lectura compartida o independiente, puede utilizarse de manera multidisciplinar.

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El libro trata sobre veinte proyectos y experimentos sobre hermanas, hermanos, padres, mascotas, y el resto de la banda. Puedes explorar como los proyectos de ciencia familiar pueden ser realizados. La gente estudia muchos aspectos diferentes de relaciones familiares para aprender que diferencia implica compartir genes, padres, habitaciones, comida y muchas otras cosas. Ellos han aprendido que estas relaciones están unidas a lo que nosotros hacemos, como nosotros crecemos, y como nosotros nos relacionamos con el resto del mundo.