Angel Gutiérrez Departamento de Didáctica de la T his paper presents some hypotheses about the use of the Van Hiele Model of thinking as a framework for understanding the processes of learning in 3-dimenMatemática Universidad de Valencia Apartado 22045 sional Geometry. 46071 Valencia, Spain In this area it is specially important to differentiate the processes concerning spatial visualization fr...

carbon nanotube is investigated based on an elastic multi-layer shell model with van der Waals interaction taken into consideration. The multi-walled carbon nanotube is described as an individual elastic shell and the interlayer friction is negligible between the inner and outer tubes in the proposed model. And the Donnell equations of cylindrical shells are employed to describe the nonlinear b...

In this article, curvature effects on elastic thermal buckling of double-walled carbon nanotubes under axially compressed force are investigated using cylindrical shell model. Also, the small scale effect is taken into account in the formulation. The dependence of the interlayer van der Waals (vdW) pressure on the change of the curvatures of the inner and outer tubes at that point is considered...

1 Dornan T. Experienced Based Learning. Learning Clinical Medicine in Workplaces. PhD Thesis. Maastricht: Maastricht University, 2006. 2 Smith ES, Tallentire VR, Cameron HS,Wood SM. The effect of contributing to patient care on medical students’ workplace learning.Med Educ 2013;47:1184–96. 3 Hattie J, Timperley H. The power of feedback. Rev Educ Res 2007;77 (1):81–112. 4 Ashford SJ, Blatt R, Va...

Analysis of the approximations used in the van Hove-BCS theory. Abstract An analysis of the different approaches used within the van Hove BCS model for the high temperature superconductors has been done. How far the employment of an asymptotic expression for the density of states underestimates the thermodynamic parameters, as for example, the critical temperature, the gap at zero temperature, ...

The arguments of Van Niekerk and Van Zyl that, on the grounds that it involves an inappropriate commodification and alienation of women's labour, commercial surrogate motherhood (CSM) is morally suspect are discussed and considered to be defective. In addition, doubt is cast on the notion that CSM should be illegal.

The goal of the present research is to understand individual differences and growth of children's and adolescents' performance on two spatial tasks through a formal model framework. In Study 1, 579 subjects aged 7-16 years old drew lines to represent their water-level task predictions for eight tilted rectangular vessels. In the verticality task, called the "van task," subjects drew lines repre...