Uma Ferramenta Visual para Análise de Produções Textuais dos Estudantes

Tradicionalmente a leitura e interpretação de textos é umahabilidade que humanos realizam de forma muito superior às máquinas.Entretanto, quando se trata de buscar padrões e associações em textos, oscomputadores podem realizar a parte mais exaustiva e longa desta tarefa.Técnicas de aprendizado de máquina podem auxiliar professores naavaliação de produções textuais, destacando pontos fortes e identificandodificuldades. Desta forma os professores podem oferecer um feedback maisapropriado aos estudantes por meio de reflexões pertinentes às suasaprendizagens. Este artigo descreve a implementação e os resultadosobtidos com o desenvolvimento de um software de apoio a análise textual.Para validar o software foram utilizadas produções textuais de estudantesda disciplina de Química Orgânica de uma Universidade (nome omitido)

Playing the Geneticist: Discovering DNA and Unveiling what is Behind the Human Karyotype

The study of our genetic material (DNA) is something fascinating and still mysterious to everyone. Aiming to bring their hidden knowledge to a most dynamic and simple language, and in attempt to bring it to the reality of all, genetics has been seeking alternative methodologies so that a larger number of people can understand it and realize that its theme, the DNA, influences and is part of our daily lives. This calls for a need to expand on experimental activities that makes students build their knowledge collectively, dynamic and fun, making significant, interesting and lifelong learning, aimed on understanding and identifying our genetic material, its importance and hidden mysteries, in their teachings. The experimental practices are introduced as a support to the full comprehension of the subject. These workshops function as a constructive way of building knowledge through action and reflection, applied to teachers of the city of Caxias do Sul. The subject studied in the workshop involves topics directly related with the genome, while the experimental practices consist into DNA extractions, karyotype analysis and ideogram construction. These educational activities should be worked in classroom as a support tool in building of knowledge and must be approached continuously and interdisciplinary to provide a meaningful learning. The workshop was well received within the community, giving a solid foundation for the pedagogical teaching of Biology

Response to fire, thermal insulation and acoustic performance of rigid polyurethane agglomerates with addition of natural fiber

This paper aims to reuse rigid polyurethane waste in the preparation of composites with the addition of banana fibers and cellulose in order to qualify the acoustic performance, thermal insulation and reaction to fire the material with the addition of 7% of polysulfone. Agglomerated with 100% of polyurethane and either with 20% of banana fiber or 20% of cellulose were characterized in the sound transmission loss, thermal conductivity and reaction to fire, take into account variations in the granulometry of the solid polyurethane and type of pressing. Natural fiber composites had lower thermal conductivity, higher acoustic insulation in medium frequencies and the addition of polysulfone delayed the total time of firing the material

Sound insulation of floors : a new composite with a resilient layer of recycled polymer

PU (polyurethane) integral skin and PVC (polyvinyl chloride) are polymeric materials which have favorable physical characteristics to reduce the impact noise when applied to floor systems. In civil construction, floating floors systems are composed of two layers above the slab: a resilient layer and, above this, a rigid layer of cement matrix that works as a subfloor. This research aims to evaluate the incorporation of PVC and PU skin waste in the resilient layer of the floating floor, for impact noise insulation. It was conducted physical, mechanical and morphological tests in the composite, as SEM (scanning electron microscopy), determination of compressive creep, and impact noise test to evaluate the absorption capacity of the floor system over time. Furthermore, experimental results were compared with theoretical studies. These correlations may assist in understanding the behavior of impact noise damping and its relation to the size of the samples

Degradation study of polypropylene (PP) and bioriented polypropylene (BOPP) in the environment

Polymers are vastly employed for numerous purposes in different industrial segments and generate soaring quantities of discarding in the environment. This research analyzed the degradability/biodegradability of polypropylene films (PP) and Bioriented polypropylene (BOPP) polymers after 11 months interred in the São Giácomo landfill in Caxias do Sul. Comparing the buried PP film to a sample of virgin PP, two peaks of degrading activity appeared at the TG curve as well as structure modification typified by occurrence of new absorption bands at FTIR, which can be credited to changes in crystallinity. Thermal analysis carried out on the buried PP and BOPP showed decreases in the percentage of crystallinity due to chain scission. The major reduction was observed in the PP, since its crystallinity is a consequence of polymerization instead of chain orientation processes, as in BOPP. Cracks and erosion of the polymer surface were detected in both PP and BOPP, indicating degrading processes by microorganisms

Sound insulation of floors : a new composite with a resilient layer of recycled polymer

PU (polyurethane) integral skin and PVC (polyvinyl chloride) are polymeric materials which have favorable physical characteristics to reduce the impact noise when applied to floor systems. In civil construction, floating floors systems are composed of two layers above the slab: a resilient layer and, above this, a rigid layer of cement matrix that works as a subfloor. This research aims to evaluate the incorporation of PVC and PU skin waste in the resilient layer of the floating floor, for impact noise insulation. It was conducted physical, mechanical and morphological tests in the composite, as SEM (scanning electron microscopy), determination of compressive creep, and impact noise test to evaluate the absorption capacity of the floor system over time. Furthermore, experimental results were compared with theoretical studies. These correlations may assist in understanding the behavior of impact noise damping and its relation to the size of the samples