Motion of carbon nanotubes in a rotating drum: The dynamic angle of repose and a bed behavior diagram

in Chemical Engineering Journal (2009), 146(1), 143-147

The granular flow behavior of carbon nanotubes produced by the CCVD method in a laboratory continuous inclined rotary reactor and of a catalyst was experimentally studied using a rotating drum. The ... [more ▼]

The granular flow behavior of carbon nanotubes produced by the CCVD method in a laboratory continuous inclined rotary reactor and of a catalyst was experimentally studied using a rotating drum. The dynamic angle of repose of the bulk solid and the standard variation of the solid bed surface were determined as a function of rotational speed of the rotating drum and for several filling percentages of the drum. Whatever the carbon nanotube production conditions, the dynamic angle of repose and the standard variation of the solid bed depended only on the filling percentage of the drum. Results were very interesting for practical application to carbon nanotube production in an industrial continuous inclined rotary reactor, because the granular flow behavior was the same during the reaction throughout the length of the reactor and depended only on the reactor filling. A bed behavior diagram based on the drum rotational speed and on the drum filling percentage was also constructed experimentally. The flow behavior of the solid during carbon nanotube production was on the boundary between the slumping and the rolling modes, leading to a good mixing of gas and solid during the reaction and to an improvement of the mass and heat transfer in the bed. (c) 2008 Elsevier B.V. All rights reserved. [less ▲]

Motional heterogeneity of intercalated species in modified clays and poly(ε-caprolactone)/clay nanocomposites

Conference (2006, November 17)

La motivación de los términos en terminología jurídica. Cómo la terminología jurídica asume los riesgos de su evolución

in Revista Llengua i Dret (de la ‘Escola d'Administració Pública de Catalunya’) (2009)

En la Terminología wüsteriana ‘clásica’ el “término ideal” es monosémico, o monorreferencial, biunívoco, exento de connotaciones, normalizado, prescriptivo en su empleo, productivo y motivado. Hemos ... [more ▼]

En la Terminología wüsteriana ‘clásica’ el “término ideal” es monosémico, o monorreferencial, biunívoco, exento de connotaciones, normalizado, prescriptivo en su empleo, productivo y motivado. Hemos aplicado al corpus jurídico objeto de nuestro estudio – la Responsabilidad civil extracontractual - el filtro de lectura de la terminología clásica. El resultado observado es que, a cada una de estas características corresponden ejemplos observados en la nomenclatura estudiada que desmienten la adecuación a dicha nomenclatura al ideal terminológico. En efecto : - Al ideal de monosemia o monorreferencialidad, que requiere una determinación inequívoca de las nociones, una definición estricta de los términos y que cada uno de éstos designe una noción única y sin connotaciones, se oponen los siguientes rasgos observados : la existencia de nociones de imposible definición o de definiciones de contenido variable; la incertidumbre de la propiedad técnica de la definición de los términos; la alta proporción de términos que son homónimos de palabras de la lengua común; la presencia de connotaciones indeseadas; las frecuentes polisemia y homonimia que ostentan no pocos términos; - Al ideal de biunivocidad se opone un fenómeno de sinonimia abundante; - Al ideal de normalización de los términos de las Lsp, lo mismo que al carácter ideal de ser prescriptivos en su empleo, se opone, no sólo la existencia de lexicalización incompleta, sino también la de nociones sin denominaciones. También se verifica ausencia de unanimidad entre autores sobre el uso de los términos (definiciones y denominaciones). - El ser productivos los términos plantea el problema de derivaciones de coherencia perdida. - Hasta aquí, pues, el análisis no señala más que ‘defectos’ que ostenta la nomenclatura terminológica estudiada. Sin embargo, al abordar el último tema de la motivación de los términos, la investigación, de pronto, debe desistir de toda idea de 'defecto' y reconocer más bien a los juristas una singular y constante preocupación por la justeza y afinamiento de las denominaciones. Lo cual no sólo es en sí un esfuerzo poco común entre los usuarios de la lengua, inclusive de especialidad, sino que, incluso justifica los supuestos ‘defectos’ anteriormente observados, en realidad suscitados por el esfuerzo mismo de perfeccionamiento de las denominaciones. Ante semejante análisis, nuestra conclusión ya no puede someterse al ideal wüsteriano, pronto a imponer una ‘normalización’ de los defectos observados, los cuales, correctamente analizados, no son sino las consecuencias provisionalmente negativas de un ideal superior. Antes bien, nos parece más atinado distanciarnos de Wüster, poniendo en tela de juicio los requisitos mismos del “termino ideal” de su doctrina terminológica. En conclusión, corregimos el idealismo wüsteriano, asignando su justo lugar y papel a sendos rasgos nocionales y lenguajeros de las LFE. [less ▲]

Motivation and satisfaction of participants and spectators attending mass sport events

in Proceedings of the 8th European Association for Sport Management Congress (2000)

Considering their sociocultural and economic impact, sport events represent a pertinent centre of interest for sport management research. Considering their frequent occurrence and importance to the ... [more ▼]

Considering their sociocultural and economic impact, sport events represent a pertinent centre of interest for sport management research. Considering their frequent occurrence and importance to the survival of many associations such as sport clubs, schools, youth or neighbourhood committees, mass sport events could receive more attention than they actually do. In this paper attention was focused on participants and spectators attending the following five mass sport events organised in Wallonia, the French speaking part of Belgium. [less ▲]

La motivation des arrêts de la cour d'assises et son contrôle

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2010)

La motivation du licenciement en droit belge

in Revue de la Faculté de Droit de l'Université de Liège (2011)

La motivation en contexte scolaire : Points de vue de parents et d'élèves

in Puzzle (1997), 3

Motivation et volition: une distinction incontournable

in Education-Formation (2006), 284(December), 62-71

Firstly, in this paper the historical analysis of volition as a specific construct in front of motivation and conation is developed. From the middle of the eighties volition is focused in empirical ... [more ▼]

Firstly, in this paper the historical analysis of volition as a specific construct in front of motivation and conation is developed. From the middle of the eighties volition is focused in empirical literature as a central concept in goal-directed learning behaviours, especially when goals are difficult to reach. Secondly, limits of motivation (values, expectations) to explain reaching complex learning goals which imply overcoming internal or external obstacles are heightened and volition (action control strategies and implementation intentions) is proved to basically contribute to initiate goal-directed actions and bring them to a successful conclusion. [less ▲]

Motivation in the Gym: A Qualitative Approach

in Chin, M. K.; Hensley, L. D.; Cote, P. (Eds.) et al Global Perspectives in the Integration of Physical Activity, Sports, Dance, and Exercise Science in Physical Education: From Theory to Practice (2004)

Students’ motivation is a major concern of physical education teachers as well as it interest the others educators. Understanding of that complex variable increased during the last two decades. In the ... [more ▼]

Students’ motivation is a major concern of physical education teachers as well as it interest the others educators. Understanding of that complex variable increased during the last two decades. In the physical education domain, many studies were focused on isolated variables related to motivation and on their relationship with pupils’ behaviours. More recently, qualitative researches were conducted to enter in the class specificity and to integrate the complexity and diversity of the variables that influence students’ motivations. Combining questionnaires interviews and observation, some researchers have confirmed that student’s motivation depends on a package of dispositional as well as individual and collective situational factors. They pointed out also the determining role of the teacher in the development of a motivated class climate. This paper will describe a couple of qualitative studies designed to analyse students’ motivation and will underline their contribution in the understanding of the phenomena related to the development of motivation by students. Moreover, as teachers need research directly focused to their concerns, we must now provide them more support helping them to apply research data. The action research design is proposed as an appropriate approach in that way. The description of a pilot action research focused on the improvement of the students’ motivation in a secondary school level girls class will also proposed. The main results should provide the starting point of a reflective process about the strategies that teachers could plan on the gym. As it has been underlined above, the goal of the paper was to share useful information with practitioners and researchers and to encourage them to involve themselves in personal research on students’ motivation. [less ▲]

Motivation of schoolchildren for physical education. Comparison of high and low achievers

in Chin, K. N.; Jwo, H. (Eds.) AIESEP Taiwan 2001 International Conference Proceedings: The Exchange and Development of Sport Culture in East and West (2001)

There is no doubt that motivaton of schoolchildren is a concern for physical education teachers. Research data shows that usually physical education is pretty well considered by students. An European ... [more ▼]

There is no doubt that motivaton of schoolchildren is a concern for physical education teachers. Research data shows that usually physical education is pretty well considered by students. An European study of youth lifestyle showed that in many countries, 12 and 15 year old students like physical education (Piéron et al., 1996). Percentage over 70% of these youth answered that they liked physical education lessons ... [less ▲]