Os conteúdos escolares das disciplinas de história e ciências e suas relações com a organização curricular da Educação Física na escola
The purpose of this study was to investigate the relations between the contents of History and Science and Physical Education (PE) at school. Therefore, an effort was made to set principles to establish the sequence of contents for the 6t h to 9t h grades, and at the same time assuring the integration of PE to the school's political pedagogical proposal. The results demonstrate that those documents present a set of knowledge that offers possibilities to systematize the PE contents at school and show that the participation of PE teachers and their knowledge about books adopted is essential to build the political pedagogical proposal. Moreover, teachers from other disciplines should be aware of Physical Education specific knowledge and its value to school projects. This approach could lead to reflections on how to organize the contents while taking advantage of this work.
ESPORTE NA ESCOLA: MAS É SÓ ISSO, PROFESSOR?
Sport became. in the last decades. an hegemonic content of Physical Education classes. However. only a few of sport modalities are choosen by Physical Education teaches. This article discusses why other modalities and nonsportive contents are less utilized and it proposes some possibilities for the use of these contents.
EFFECT OF SAMPLE PREPARATION ON WATER TREE RESISTANCE OF XLPE/SEBS BLENDS
The effects of an aromatic polymer, such as poly[styrene-b-(ethylene-co-butylene)b-styrene] (SEBS), and its preparation processes on water tree resistance, morphology, crystallinity, dielectric constant and dielectric loss tangent of crosslinked polyethylene (XLPE)/SEBS and XLPE/SEBS/ethylene vinyl acetate (EVA) blends were investigated. The XLPE/SEBS samples were characterized by means of differential scanning calorimetry, scanning electron microscopy, dielectric spectral analysis and the accelerated water treeing experiment. The results clearly showed that although SEBS was partially compatible with LDPE and it was dispersed evenly in XLPE matrix, the blends demonstrated excellent dielectric performances, such as dielectric constant and dissipation factor. The crystallinity of XLPE/SEBS blends was decreased with increase in SEBS content and it was further decreased with the addition of EVA. SEBS could effectively improve the water-tree resistance of XLPE and both SEBS and EVA were found to improve the water tree resistance of XLPE synergistically as expected. The differences in sample preparation processes could change the phase morphology and dielectric performance of the blends, and could also influence the dispersion of SEBS in XLPE matrix as well as the crystallinity of the blends. Different preparation processes led to different water tree resistance behaviours of the samples. The improvement of SEBS dispersion in XLPE matrix helped to improve the water tree resistance of XLPE.