1000 resultados para Espalhamento (Fisica)


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Universidade Estadual de Campinas. Faculdade de Educação Física

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Universidade Estadual de Campinas. Faculdade de Educação Física

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Universidade Estadual de Campinas. Faculdade de Educação Fisica

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Universidade Estadual de Campinas. Faculdade de Educação Fisica

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Este trabalho expõe uma dedução da intensidade da luz espalhada por pequenas partículas na atmosfera, o que explica o porquê do azul do céu e o vermelho do pôr-do-sol. Mostramos, também, uma experiência bem simples, sobre os temas abordados, que foi elaborada com o intuito de aplicar a alunos do Ensino Médio

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We report here on some aspects of the acetylation in LiCl/N,N-dimethylacetamide, DMAc, of untreated and mercerized sisal cellulose, hereafter designated as sisal and M-sisal, respectively. Fiber mercerization by NaOH solution has resulted in the following changes: 29.9% decrease in the index of crystallinity; 16.2% decrease in the degree of polymerization and 9.3% increase in α-cellulose content. A light scattering study of solutions of sisal, M-sisal, microcrystalline and cotton celluloses in LiCl/DMAc has shown that they are present as aggregates, with (an apparent) average aggregation numbers of 5.2, 3.2, 9.8, and 35.3, respectively. The presence of these aggregates affects the accessibility of cellulose during its functionalization. A study of the evolution of the degree of substitution, DS, of cellulose acetate as a function of reaction time showed an increase up to 5 h, followed by a decrease at 7 h. Possible reasons for this decrease are discussed. As expected, M-sisal gave a higher DS that its untreated counterpart.

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In this study the role of different metal centers (magnesium, zinc and copper) on the enhancement of the hydrophilic character of metallochlorophylls, was evaluated. The solvatochromism as well as the aggregation process for these compounds in water/ethanol mixtures at different volume ratios were evaluated using Fluorescence, and Resonant Light Scattering (RLS) measurements, aiming to characterize the behavior of these compounds. Independently on the studied metallochlorophyll, the presence of at least 60% of water results in a considerable increase in the fluorescence emission, probably a direct consequence of a lower aggregation of these compounds, which is confirmed by the results from RLS measurements. Additionally, the results suggest that magnesium and zinc chlorophyll should be promising phototherapeutic agents for Photodynamic Therapy.

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In the southern region of Mato Grosso do Sul state, Brazil, a foot-and-mouth disease (FMD) epidemic started in September 2005. A total of 33 outbreaks were detected and 33,741 FMD-susceptible animals were slaughtered and destroyed. There were no reports of FMD cases in other species than bovines. Based on the data of this epidemic, it was carried out an analysis using the K-function and it was observed spatial clustering of outbreaks within a range of 25km. This observation may be related to the dynamics of foot-and-mouth disease spread and to the measures undertaken to control the disease dissemination. The control measures were effective once the disease did not spread to farms more than 47 km apart from the initial outbreaks.

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The purpose of this study was to verify regular schooling teacher's attitudes toward inclusion children with disabilities in the classes. For that, 90 physical education teachers, from private and public schools, answered to a scale with 18 affirmations. It was observed by results that general tendency of teachers was negative toward inclusion. This pessimism wasn't related to teachers sex and time experience. Stronger teachers pessimism was about their lack of preparing to work with handicapped students. Teachers with less experience time showed more optimism about the benefits of all students in inclusion settings.

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This text argues some questions controversies on the regulation of the profession. Our interest is to give a theoretical basement of a side, and to hear the citizens directly related on these controversies of another one. For this we first decide to clarify the initial aspects of the regulation of the professions, stops later making an analysis of the law and resolutions of the Advice presenting: (a) the meaning; (b) attributions and abilities; (c) the limit for the fiscalization and of the power of polices and (d) to point the typical activities of the professional. Concluded this part we will raise an controversial subject that appeared in these last five years: the subordination of the dance, yoga, martial arts to the Federal Advice of Physical Education.

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The paper studies the archeology of editorial practices of the journal Movimento regarding the processes of editing, diffusion, circulation and adaptation to the index agencies. It reveals the phases of the printed material emphasizing the choices of the editors with reference to the graphical project of the periodic that puts in circulation different devices of regulation of the appropriations, at the same time when it aims at creating an identity that qualifies the periodic as an authorized gadget able to show the readers what Physical Education is in Brazil.

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The purpose of this paper is to present results of research conducted with artisan fishermen and surfers in order to analyze the meaning of interactions between each one of these groups with Nature. Academic and field researches (direct observation and free interviews) were used to investigate nine fishermen (eight male, one female; 28-71 years; 10 years practice minimum) and six surfers (male; 23-41 years age, 1-29 years practice) in Sao Paulo's North Coast. The body and the way as it interacts with Nature, in the daily life of these groups, points out to subjects with little exposure in the Physical Education field.

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The investigation of the nature of motor difficulties children experiment resulted in the identification of a Developmental Coordination Disorder (DCD). The lack of consensus on the nature and the mechanisms of DCD might not be due to an apparent resilience of the disorder to the scientific enterprise. On the contrary, the present paper has a goal of presenting a thesis according to which the problem resides on the definition of DCD and on the selection of samples in studies that do not distinguish between clinical and research criteria. In conclusion, three steps for characterizing DCD are presented.