923 resultados para Equação diferencial


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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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This article presents some definitions about design concepts and makes a comparison of Aloísio Magalhães’performance, a brazilian designer considered for many authors one of the most influential 20th century designers. By reviewing the bibliography, it is possible to evidence and debate the engagement and the perspicuity of Aloísio Magalhães, related to his job. This article also presents a short view about life and works of this designer.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Water erosion is one of the main processes responsible for soil degradation, resulting in loss of parcels of land suitable for agriculture, to the loss of agricultural inputs and the resulting drift of pesticides and excess sediment to rivers, causing phenomena such as the siltation and eutrophication of water bodies. Such a scenario makes it necessary to perform work of a technical and scientific to provide subsidies to land-use planning, in order to protect natural resources biotic and abiotic. To develop this work is necessary to find a unit of analysis capable of integrating the different elements of the landscape, hydrosphere, atmosphere, biosphere and lithosphere. Therefore we adopt for this work the watershed as main unit studies. From this question, this project will focus on the assessment of surface water erosion through MEUPS (Equation Modified Universal Soil Loss) predictive model. With the aid of maps, remote sensing products, and the use of geotechnology, this study aims to evaluate for the for Natural Erosion Potential the basin of the Jacutinga river, located in Rio Claro - SP

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Crohn’s disease is a chronic infl ammatory bowel disease with segmental transmural infl ammation, which complicate with formation of fi stulas and abscesses. The hidradenitis suppurativa (HS) is characterized by recurrent abscesses, with a predilection for areas rich in apocrine glands such as the axillary, inguinal and perineal. The differential diagnosis between these diseases is diffi cult and may compromise treatment. Report case: C.R.M.A., 40 year-old, female, white, ileal and colonic Crohn’s disease complicated with perianal and rectovaginal fi stula for 12 years, treated with biological therapy since May 2010. In Sep/2010 presented with an abscess in the buttock D with purulent discharge refractory to the use of ciprofl oxacin and metronidazole. USG: collection of 30 cm3 in buttock D. The diagnosis was HS and the patient underwent extensive surgical removal of the affected areas (10 x 2 cm) with healing by secondary intention. Skin graft performed unsuccessfully in Dec/2010. The patient returned in jan/2011 with a new fi stula at the site of resection, consistent with Crohn’s disease. In fev/2011 underwent drainage of abscesses and placement of setons in perianal fi stulas. Currently in therapy with good biological evolution of fi stulas. The prevalence of HS varies from 0.3 to 4% of the population in general. The axilla is the region most affected and perianal lesions are associated with greater weakness. There are published reports of association between HS and Crohn’s disease sporadically and further studies are needed to assess a common pathogenesis. The differential diagnosis should be performed in all cases planning immediate treatment, avoiding complications and worsening of the patient’s quality of life.

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The Earth receives annually 1,5.1018 kWh of solar energy, which corresponds to 1000 times the world energy consumption in this period. This fact comes out that, besides being responsible for the maintenance of life on Earth, the solar radiation is in an inexhaustible energy source, with an enormous potential for use by systems capture and conversion into another form of energy. In many applications of low power systems that convert light directly into electricity, called photovoltaic advantageously replace other means of production processes, where its distribution is very significant. The determination of the power generated by such a system is of paramount importance for the design energy of its implementation and evaluation of the system itself. This study aims to determine a relationship between the maximum power generated by solar photovoltaic and characteristic parameters of the generator. This relationship allows to evaluate the performance of such a system. For simulations of the developed equations were used 3 photovoltaic modules with an output of 100 Wp each, and data collection was performed during one year by enrolling in addition to meteorological data, solar irradiance incident on the modules.

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

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Física - IFT

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Simulamos a separação dos componentes de uma mistura bifásica com a equação de Cahn-Hilliard. Esta equação contém intrincados termos não lineares e derivadas de alta ordem. Além disso, a delgada região de transição entre os componentes da mistura requer muita resolução. Assim, determinar a solução numérica da equação de Cahn-Hilliard não é uma tarefa fácil, principalmente em três dimensões. Conseguimos a resolução exigida no tempo usando uma discretização semi-implícita de segunda ordem. No espaço, obtemos a precisão requerida utilizando malhas refinadas localmente com a estratégia AMR. Essas malhas se adaptam dinamicamente para recobrir a região de transição. O sistema linear proveniente da discretização é solucionado por intermédio de técnicas multinível-multigrid.