8,418 research outputs found
Students' voice on literature teacher excellence:Towards a teacher-organized model of continuing professional development
This study contributes to the development of empirically based, domain-specific teaching standards in upper secondary education. It is part of a Dutch project to develop ecologically valid teaching standards and to find a teacher-organized model for continuing professional development. A previous study about teachers' perceptions of what constitutes an excellent teacher of literature resulted in a set of six domain-specific teaching standards. In this study, an exploratory factor analysis was performed to find out which dimensions or characteristics of an excellent teacher of literature could be gleaned from the students' perspective. We found four similar and two complementary dimensions
Gel transitions in colloidal suspensions
The idealized mode coupling theory (MCT) is applied to colloidal systems
interacting via short-range attractive interactions of Yukawa form. At low
temperatures MCT predicts a slowing down of the local dynamics and ergodicity
breaking transitions. The nonergodicity transitions share many features with
the colloidal gel transition, and are proposed to be the source of gelation in
colloidal systems. Previous calculations of the phase diagram are complemented
with additional data for shorter ranges of the attractive interaction, showing
that the path of the nonergodicity transition line is then unimpeded by the
gas-liquid critical curve at low temperatures. Particular attention is given to
the critical nonergodicity parameters, motivated by recent experimental
measurements. An asymptotic model is developed, valid for dilute systems of
spheres interacting via strong short-range attractions, and is shown to capture
all aspects of the low temperature MCT nonergodicity transitions.Comment: 12 pages, LaTeX, 5 eps figures, uses ioplppt.sty, to appear in J.
Phys.: Condens. Matte
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