186 resultados para Polimeros : Tecnologia


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Pós-graduação em Ciência da Informação - FFC

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Pós-graduação em Desenvolvimento Humano e Tecnologias - IBRC

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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The interest in the use of vegetable fibers (e.g. jute, sisal and curaua) for more noble applications, such as reinforcement in polymeric composite materials, has increased over the years due to a variety of aspects, especially those related to environmental legislation and community awareness regarding the life cycle of products. In this context, the aim of this work is to develop hybrid interlaminate curaua/glass/insaturated polyester composites by hot compression molding and to analyze their mechanical properties as a function of the thickness of the laminate. The short beam strength of the thickest sample decreased due to its higher void content. Furthermore, the thinnest sample showed lower hardness, and lower impact, tensile and Iosipescu shear strength, partly attributed to its lower fiber volumetric fraction. Thus, in general, the most adequate laminate was the one comprising eight layers, four of which were of glass fiber and four of curaua fiber, but only if flexural loading is not critical.

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Lithium ion conducting polymer electrolytes based on polyvinyl Alcohol (PVA-OH) complexed with salt Li2SO4 and different weight percent ratios of PEG(400) plasticizer have been prepared by solution cast technique using deionized water as solvent. The thermogravimetric analysis (TGA) showed that the thermal stability of the materials depended on the plasticizer content. The FTIR study confirmed the polymer salt complex formation. The modulus spectra indicated the non-Debye nature of the material; a dominant relaxation process is visible being associated with the dynamic glass transition, relaxation-a. The maximum of each peak is shifted to higher frequencies as the plasticizer increases due to an enhancement of dipolar mobility in the origin of cooperative motions. A power law frequency dependence of the real part of the electrical conductivity is observed, which is characteristic of the effects of ion-ion and/or ion-chain correlations in ion motion. This variation is well fitted to a Jonscher's expression.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Due to the process of educational inclusion, it is necessary for the teacher who works with disabled students to acknowledge and master the resources of assistive technology equipment available in Brazil. The objective was to identify the presence of these resources at school and evaluate, having the teacher as the evaluator, the conditions of dealing with the Assistive Technology resources and equipment. The sample consisted of 14 teachers who work in the Resources Multifunction Classroom and 18 regular classroom teachers who have disabled students enrolled in their classrooms. Data collection was performed through the TAE Questionnaire - Assistive Technology for Education. The data collection was performance in groups during the training course sponsored by the Education Department of Rondonópolis as part of the Program of Continuing Education Training for Managers and Educators - Inclusive Education: The Right to Diversity. The questionnaire data indicated differences between the two groups mentioned. The teachers of the Resource Classes indicated that Assistive Technology resources are now being introducing at schools and that over 50% of this group understand the resources presented on the questionnaire. Most of the regular classroom teachers is still unaware of the Assistive Technology resources and equipment. Regarding the dealing of these resources the group of teachers from the multifunctional classroom is better prepared to use this technology. The data suggest the need for investment in acquisition and training of teachers in relation to Assistive Technology resources.

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In the paper analyzes the process of knowledge construction in the news regarding the emergence of massive information and communication technologies. In this context, through a qualitative approach, first we examine the potential of production, dissemination, access and use information in a technocratic perspective, and secondly, the negative impacts stemming from the computed mediation, mainly linked to the complexity of policies of democratization of access to information and loss of criticality of science. The focus of this review focuses on the current model of information search and knowledge construction through the Web, outlining aspects inherent to the process in general. Similarly, envision different contributions of information science for the systematization of human knowledge, guided through the social actions of professionals working in various fields, with emphasis on the information representation and retrieval. It is hoped that work can contribute to the current thematic reflection on the production, dissemination and use of information as well as on digital inclusion policies.

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In 2008 two laws that changed the didactic- pedagogic and administrative organization of vocational schools were enacted: the Law 11.741/2008, which incorporated the Technical Professional Education for the Middle Level to Basic Education; and Law 11.892/2008,which has transformed Agrotechnical Schools, the CEFET 's and some technical schools linked to universities into Colleges of Education, Science and Technology (IFs). These institutions have been operating at all levels and types of education provided in the Law of Directives and Bases of National Education number 9394/1996, with the exception of Early Childhood Education. Vocational and training schools, which gave origin to the IFs,have historically restricted youth education to teaching professional techniques, but due to the reformist laws, they were led to revise their conceptions of work and education. Thus, the goal of this article is to analyze the concepts of Basic Education and work that permeate these laws and the organization of educational work at IFCE. Have these laws been promoting a rupture with the history of vocational education in the country? Have the IFs been accomplishing a teaching job in addition to technical training? The choice for these questions was motivated by two main reasons: a) Vocational Education in the aforementioned institutions have traditionally been restricted to the qualication of the labor force for learning a technical profession, without relating it to issues that concern basic education; b) The Reform of Basic Education, from 1990 to 2013, was conducted in the context of capital's structural crisis and aimed to adapt the educational system to the demands of productive sectors. Thus, the main objective of this paper is to explain the contradictions that exist in project of formation of the working class, in the context of a conictual society divided into classes, a situation that alienates the youth to live this time forever.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Since the 1990s, higher education technology courses in Brazil have greatly expanded the offer of courses and places. However, the high dropout rates presented in these courses led to a research in order to uncover the factors that lead students to dropout. Through literature review and desk research, this study makes a historical analysis of how professional education is conducted in Brazil. This paper seeks to demonstrate that the implementation of public policies for professional education exacerbates the school’s duality. However, such duality generates contradictions between subjective and objective issues produced by the ideology disseminated by public policies and government actions in relation to vocational education. These contradictions end up unveiling the social inferiority of vocational education and discourage students from remaining in the courses. The legal equality between educational levels seeks to mediate the emergence of these contradictions. However, despite legal equality, social equality is not achieved in the implementation of public policies, leading to a high dropout rate.