A evolução histórica do lançamento do dardo: base para o ensino do atletismo em aulas de Educação física

Ainda que pouco conhecida, a história do lançamento do dardo revela ser esta uma prova muito antiga, existente desde os Jogos Olímpicos da Grécia Antiga. Com base nisso, o objetivo desta pesquisa consistiu em resgatar a história dessa prova do atletismo, observando seu desenvolvimento ao longo dos anos, sobretudo no que diz respeito às alterações em suas regras, em seus implementos, em seus resultados, entre outras coisas. Com base em livros, documentos, registros de competições e fotografias de diferentes épocas, essa pesquisa histórico-bibliográfica procurou coletar o maior número de dados que nos permitem compreender e analisar o desenvolvimento da prova do lançamento do dardo até os dias atuais. Entre outras coisas, os resultados evidenciam o surgimento do lançamento do dardo a partir da necessidade de sobrevivência do homem, sendo utilizado, sobretudo, em suas atividades de caça e guerra, no período da Pré-História. No período da Antiguidade Clássica, há registros que comprovam a utilização do dardo por infantarias e cavalarias, na Grécia Antiga, no Império Romano e pelos Lusitanos. Entretanto, além das guerras, o dardo era também utilizado nesse período em atividades esportivas. O lançamento do dardo era praticado de duas diferentes formas nessa época: o lançamento do dardo em um alvo prédeterminado (traçava-se um círculo com a distância desejada e o atleta deveria fazer o dardo cair dentro dele). Esse tipo de lançamento ocorria a partir de um ponto fixo que, muito provavelmente, era a linha de partida do estádio (stádion), chamada de “balbís” - e o lançamento do dardo em um alvo predeterminado (que acontecia geralmente em cima do cavalo, e o cavaleiro deveria... (Resumo completo, clicar acesso eletrônico abaixo)

Avaliação da tenacidade à fratura em juntas soldadas circunferenciais de tubulações de processo

This work aims to analyze the toughness of a welded joint in the presence of a crack through the analysis of maximum tension the material can withstand the presence of this type of defect, since a discontinuity is likely to occur in this type of joint and its detection and its design is simple, using non-destructive testing techniques. The study will be conducted through the CTOD test - Crack-Tip Opening Displacement, with type specimens SE (B) - Single Edge Bend taken from a weld in the L-C position in relation to the length (longitudinal axis) of a test tube. The main idea is to simulate the welding conditions for the manufacture of industrial pipes, made in boiler shops (pipe-shop) within petrochemical plants. These pipes are often subject to operation with flammable and toxic subjected to high pressures and temperatures, where one can break the line can cause irreparable damage to the plant, the environment and the health of surrounding communities. With this study we evaluate whether the weld metal has the same properties as fracture toughness of the base material. This study shows the importance of using a qualified welding procedure for performing quality welds while maintaining the properties of the fracture toughness of the base metal. It was found from the results of tests using a welding procedure described for carrying out welding ensures mechanical properties very close to the base metal, which in terms of design is great, since one can ensure that the weld will the same characteristics of the base metal specified for the assembly of the pipe

Investigação orientada e formação inicial de professores de química: um estudo com base em uma proposta de elaboração de mini-cursos temáticos

The educational institutions need to rethink issues related to teacher training in order to seek personal construction of teaching. Oriented research has been identified as useful in the process of teacher training. Through research builds knowledge about the problems faced in teaching, producing the most effective methods. The aim of this paper is to verify the validity of the application of research activities in the form of short courses and themed play during the formation of licensees and the use and construction of knowledge of high school students who attended these short courses. This work is linked to training of undergraduates and implementation of different activities of teaching and learning for high school students. The oriented investigation was the methodology chosen for the development of activities in which, through the construction and implementation of the mini-courses Students are encouraged to participate in the construction of knowledge itself in activities that suggest the development and testing of hypotheses. The mini-courses are designed and implemented by teachers of the ninth and tenth terms of the degree in chemistry. Students of public schools were the privileged. Data were collected through observation and interview. In applying these mini-courses, associated with the daily, prospective teachers connected theory to practice, arousing the curiosity of students and leading them to raise issues related to the content of chemistry. Students showed interest in the construction of the content addressed. The student teachers sought to study different concepts and how to make them more attractive, causing the chemistry was associated with the phenomena of everyday life, including the problems faced when teaching and trying different possible solutions. Thus, there was an increase in interest in teaching and learning

Análise do desempenho físico-mecânico de painéis compensados de Pinus sp. produzidos com adesivos aquosos a base de poliacetato de vinila e de homopolímero vinílico

This study aimed to evaluate the physico-mechanical performance of three PVA adhesive formulations according to the Brazilian standards for plywood testing and to evaluate the results with those presented in the technical literature and specified in normative documents. The study presents the production process of the panels, the obtaining of samples and, finally, the implementation of physico-mechanical characterization tests based on plywood Brazilian standards. For the panels production it was used a gramature of 120 g / m² and applied a pressure of 15 bars and two temperature combinations and pressing time for each adhesive. The commercial adhesives used were PVA 1810, PVA 1060 and Vinyltec 239. The physical tests conducted were thickness swelling, density, moisture content and water absorption. The mechanical tests were static flexion, for the determination of elasticity modulus (MOE) and rupture modulus (MOR), and shear in the glue line. Among the three formulations studied none showed good performance in the presence of water. However, other trials in the adhesive showed better results and closer to the commercially equivalent used, in the case the urea-formaldehyde, was the PVA 1810, that can be applied in non-structural uses and in environments without the presence of moisture

Estudos de pré-formulação e desenvolvimento de cosméticos - linha health and beauty

O constante crescimento na quantidade de produtos cosméticos e o interesse e a necessidade da população por uma pele mais jovem e bonita, requer buscas continuas de inovação para o desenvolvimento de novos produtos baseados em pesquisas realizadas por grandes, medias e pequenas empresas. Para o desenvolvimento de novas formulações é necessário possuir um conhecimento especifico e estar em constante atualização sobre novas matérias primas, processos de produção, legislação vigente e outros. Sobretudo é extremamente importante avaliar o publico alvo, o que esses esperam e desejam do mercado de cosmético, antes mesmo de dar inicio ao processo de desenvolvimento. Neste trabalho o publico alvo são as mulheres, porém não existe qualquer restrição para que os homens não os utilize. Desta forma, o presente trabalho propôs-se a desenvolver uma linha de preparações antienvelhecimento que tem como objetivo cuidar da saúde amenizando os sinais e danos causados pelo envelhecimento, realçando e despertando a beleza escondida em cada individuo. A base para o desenvolvimento das formulações foi elaborada por meio de uma pesquisa de cunho bibliográfico constituída essencialmente pela leitura de obras especializadas em cosméticos, cosmecêuticos e ativos dermatológicos. Do ponto de vista prático foram elaboradas diversas formulas que complementaram o desenvolvimento teórico realizado.

Cálculo em elementos finitos das frequências naturais dos modos de flexão de uma linha de eixo de unidade geradora hidráulica em escala

Pós-graduação em Engenharia Mecânica - FEG

Comprimento radicular e nutrição de cultivares de painço em resposta à calagem

Information on improved cultivars of fall panicum and cultural practices concerning its cultivation is scarce in Brazil. So, the objectives of this research work were to evaluate root length and the mineral nutrition of fall panicum plants as influenced by liming in an acidic soil. The experiment was conducted in vases containing 13 dm3 of soil under greenhouse conditions up to 44 days after seedling emergence. The experimental units were distributed inside the green house according to a completely random design in a 2 X 4 factorial scheme, that is, two fall panicum cultivars (‘AL Mogi’ and ‘AL Tibagi’) and four doses (0.0, 1.67, 2.91, and 4.15 t ha-1 ). The experimental units were replicated 4 times. ‘AL Tibagi’ plants root system showed more tolerance to soil conditions of low base saturation. That cultivar also absorbed more efficiently P, N, Ca, Mg, and K from the acidic soil. Liming brought about increments of P, N, Ca, Mg, and S absorption by the fall panicum cultivars.

Estudo das propriedades ópticas de pós cerâmicos à base de Zn3Ga2Ge2O10: X% Cr3+ (X = 0 ; 0,5 ; 0,75 ; 1,0)

Ceramic powders based on Zn3Ga2Ge2O10: Cr3+ X% (X = 0.0; 0.5; 0.75; 1.0) were synthesized by solid-state reaction method. The gallium-zinc germanate doped with chromium presents an interesting property of phosphorescence, that means, it is capable of emitting light when excited by a source of radiation, and such emission remains for some time after stopping the source. For this reason, these materials can be widely applied in night-vision surveillance, (through the use of solar energy, for example), electronic devices screen, emergency routes signals, control panels indicators in dark environments, etc. In this job were considered different amounts of dopant in order to perform a comparison of structural and photoluminescent properties. For that, some analyses were performed on samples, such as XRD, FT-Raman, SEM, UV-vis and photoluminescence measurements (PL). Such analysis allowed to infer that the presence of chromium results in no phase transformation, so that the four compositions have the same set of phases: cubic, rhombohedral and hexagonal. Although the structure was not changed, chromium influences other properties / characteristics of these materials. Examples are: increase of band-gap, decrease of average particle size, small changes in binding energy checked by Raman and especially the increase of photoluminescent property. The chromium ions have great ease in replacing gallium ions in octahedral sites, resulting in emission of light with a wavelength of about 700 nm (infrared region), which is justified by the spin-forbidden 2E 4A2 transition. In other words, chromium is a favorable luminescent center, acting as a trap in the crystal structure, since it imprisons the excitation energy easily and releases it gradually, allowing the phosphorescence. It was observed that the composition ... (Complete abastract click electronic access below)

Influência do comprimento do pino de fibra de vidro na resistência à fratura de raízes fragilizadas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)