A (des)construção da imagem do sujeito professor na mídia: evidências da materialização de valores sociais

The main objective of this study focuses on investigate how the style of the Conhecimento Prático Língua Portuguesa magazine, from Escala publisher, reveals a materialization, in its wordings, of social values that surround our society regarding the teaching class. Besides, we thought about the construction of an other - teacher - by means of the I speech (the enunciator). Furthermore, we reflected on how happens the genre opinion article handling and whether there is, when aimed to the teaching class. All these questions were discussed under the perspective of Bakhtin's theory, focusing our analysis in the wording notions, dialogism, style and speech genres. Our analysis indicates a materialization of social values in syntactic issues and a hybridization of genres when the addressee is a teacher

Usinagem do alumínio da classe 6005 com uso de ferramenta cerâmica

The machining process is so much important in the economic world. Many machining parameters have been studied to maximize results, in terms of cost and lifetime. (decrease of cutting tool wear, improved surface finish, among others). The objective of this study is to evaluate the wear of a ceramic tool in the machining of the aluminum alloy 6005 A. The analysis of the wear of the cutting tools is very important due to its big impact on the final finishing of the piece as a whole. The evaluation took place in two stages, first it was done a detailed study of the literature of the whole machining process, where the study of the formation and swarf classification were among the most important steps in this phase. The second step consisted in the machining of the piece of aluminum 6005 A with a ceramic cutting tool constituded of aluminum oxide and magnesium oxide with silicon carbide impregnation. The swarf generated in this process was then photographed with a Zeiss optical microscope and analyzed for its size and shape. Through this comparison it was concluded that the swarf are generated shear swarfs, shaped like a tangled, fragmented and arcs connected, thus classifying the material as medium difficulty machining. Through the image analysis tool it was concluded that the parameter of lower wear was the: Vc = 500m / min, f = 0.10mm / rev and ap = 0.5mm