998 resultados para Erros de refração


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The use of analogies in high school is often useful for chemistry teaching, either on textbooks or by teachers in the classroom.This use is justified by the large number of abstract concepts that rules this course. Analogies are conceptualized by several authors, which converge on the idea that these are tools that seek a way to elucidate an unknown concept by comparing it to a familiar one, relating their similar and dissimilar features. An analysis on a survey of analogies found in high school chemistry textbooks and chemical equilibrium studies is performed in order to verify whether they are leading to misconceptions for their use by students and/or for their use by teachers in the classroom, or whether they promote a learning facilitation

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OBJETIVO: caracterizar o desempenho de escolares da 1ª série na bateria de identificação de erros de reversão e inversão na escrita. MÉTODOS: participaram deste estudo 30 escolares de 1ª série de ensino público do município da cidade de Marília-SP, de ambos os gêneros, na faixa etária de 7 anos a 7 anos e 11 meses de idade. Como procedimento foi realizada a adaptação brasileira da bateria de identificação dos erros de reversão e inversão na escrita. Esta bateria é composta por 3 testes: teste de desempenho contínuo, teste de memória de curto prazo e teste de controle de escrita. Cada teste é composto por subtestes que visam identificar a capacidade dos escolares em identificar as inversões e reversões de letras e números isolados e letras e números em sequências. RESULTADOS: os resultados revelaram que os escolares da 1ª série apresentaram desempenho superior para identificação de reversão e inversão de letras dentro de palavras do que isoladamente, identificação da reversão para letras e números com desempenho superior se comparado a inversão de letras na palavra. Além disso, os escolares deste estudo apresentaram menor tempo para identificação de reversão e inversão de letras e números isolados do que em sequência. CONCLUSÃO: a Bateria adaptada para este estudo permitiu conhecer o perfil dos escolares de 1ª série quanto a identificação dos erros de inversão e reversão, entretanto, é necessário novas aplicações para verificar a ocorrência de identificação destes erros em populações de diferentes fase de alfabetização.

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

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The monitoring of Earth dam makes use of visual inspection and instrumentation to identify and characterize the deterioration that compromises the security of earth dams and associated structures. The visual inspection is subjective and can lead to misinterpretation or omission of important information and, some problems are detected too late. The instrumentation are efficient but certain technical or operational issues can cause restrictions. Thereby, visual inspections and instrumentation can lead to a lack of information. Geophysics offers consolidated, low-cost methods that are non-invasive, non-destructive and low cost. They have a strong potential and can be used assisting instrumentation. In the case that a visual inspection and strumentation does not provide all the necessary information, geophysical methods would provide more complete and relevant information. In order to test these theories, geophysical acquisitions were performed using Georadar (GPR), Electric resistivity, Seismic refraction, and Refraction Microtremor (ReMi) on the dike of the dam in Sant Llorenç de Montgai, located in the province of Lleida, 145 km from Barcelona, Catalonia. The results confirmed that the geophysical methods used each responded satisfactorily to the conditions of the earth dike, the anomalies present and the geological features found, such as alluvium and carbonate and evaporite rocks. It has also been confirmed that these methods, when used in an integrated manner, are able to reduce the ambiguities in individual interpretations. They facilitate improved imaging of the interior dikes and of major geological features, thus inspecting the massif and its foundation. Consequently, the results obtained in this study demonstrated that these geophysical methods are sufficiently effective for inspecting earth dams and they are an important tool in the instrumentation and visual inspection of the security of the dams

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OBJETIVOS: Estabelecer a freqüência de erros inatos do metabolismo (EIMs) em uma amostra de pacientes com hipótese diagnóstica de EIM proveniente do Hospital das Clínicas da Faculdade de Medicina de Botucatu da Universidade Estadual Paulista (UNESP) e analisar a metodologia empregada nessa investigação. AMOSTRA E MÉTODOS: Foram triadas para EIM, por testes químicos e técnicas cromatográficas, 1.233 amostras de urina de 905 pacientes. RESULTADOS: O diagnóstico de EIM foi estabelecido em 18 (1,98%) pacientes; 12 deles apresentaram triagem (testes químicos e cromatografias) alterada para EIM. Todos os pacientes foram diagnosticados por análises enzimáticas. CONCLUSÃO: A freqüência de EIMs diagnosticados neste estudo (1,98%), quando comparada com a literatura, foi satisfatória, uma vez que este grupo de pacientes foi proveniente de um único hospital. A metodologia provou ser eficaz, indicando 12 casos de EIM entre os 18 diagnosticados. O estudo mostra a importância de laboratórios especializados na detecção deste tipo de patologia.

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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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In recent work (Kroll, 1990) on dairy cattle growth using its monthly weights, a Gompertz function, first considering the autocorrelated error structure, and second, the independent error structure, was fitted. The last explained 25% more of the total variance than the former. In this work, a Gompertz function was fitted with autocorrelated error structure adding seasonality to the model. This was suggested taking into account the time series autocorrelation function. In order to estimate the six parameters, an iterative procedure was used, employing a matrix X = [G\S], where G is the usual matrix for fitting the Gompertz function, and S is a 0s, 1s, -1s matrix necessary to take into account seasonality. With this model, the adjustment was better in terms of the coefficient determination.

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This article has the purpose to review the main codes used to detect and correct errors in data communication specifically in the computer's network. The Hamming's code and the Ciclic Redundancy Code (CRC) are presented as the focus of this article as well as CRC hardware implementation. Each code is reviewed in details in order to fill the gaps in the literature and to make it accessible to the computer science and engineering students as well as to anyone who may be interested in learning the technique to treat error in data communication.

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This article reviews the metabolism of fructose and sorbitol, their main clinical indications and the consequences of inadequate use. Fructose, an important carbohydrate in the diet, is present mostly in fruits and vegetables; it can also be synthesized from glucose in the organism, through the sorbitol. Fructose is known for its metabolism's inherent errors, whose clinical manifestations are potentially serious, as well as for its use as a glucose substitute in the diabetic patients' diet, due to its metabolism not being dependent from insulin. In the last years, especially in developed countries, the consumption of fructose has increased considerably, due to its use as a sweetener in industrialized foods. However, adverse side-effects may occur with the excessive ingestion of fructose, such as the increase in blood's triglycerides and cholesterol. Therefore, to know which are the patients' normal blood levels is quite important for establishing the safe amount of fructose to be prescribed, as well as for allowing the screening of metabolism diseases associated with fructose.

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Purpose: To show the importance of the cicloplegic method in the refraction evaluation comparing the automated refraction (subjective and objective) and the subjective static refraction. Method: One-hundred patients (200 eyes) between 5 and 40 years were prospectivelly evaluated according the static and dynamic automated refraction and the subjective static refraction, using an automated refractor Nidek ARK - 900. The data were submitted to statical evaluation. Results: The concordance indices were better after cycloplegia mainly in relation of the spheric degree and cílindric axes. Conclusion: Cycloplegia is very important to have accurace in the automated refraction in patients before 40 year-old.

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This study was done to determine compactness of soil strata in the urban area of Bauru, central São Paulo State using standard penetration test (SPT) and seismic refraction methods. Frequency distribution within boreholes was measured every meter to a depth of 30 meters. The geometric mean of standard penetration test values was computed every meter. A biplot graph showing the relationship of SPT with depth indicates soil stratification. In addition, five sections of seismic refraction values, which also indicate the compactness of soil strata, were obtained. A comparison of the two methods shows significant correlation between the results obtained from each.

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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)