1000 resultados para balanço térmico


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Neste artigo, pretendemos mostrar como a transição para a democracia na Argentina, apesar dos sinais de maior estabilidade institucional, convive com a consolidação de um econômico-social cujos sinais de crise tendem a acentuar cada vez mais o seu caráter excludente.

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Este trabalho tem como objetivo avaliar o complexo processo de constituição de oito experências de assentamentos rurais, no tocante ao seu desenvolvimento econômico e político-organizacional, localizados em regiões distintas do Estado de São Paulo. Trajetórias diferenciadas entre si marcam essas experiências, os aspectos organizacionais incidem de forma diferenciada sobre a evolução econômica, não havendo uma relação de causalidade entre desempenho econômico, existência de dissensões e alternativas de organização. Pulverização e competição são fatores presentes na tentativa de construção de um novo modo de vida. Constata-se significativa pressão para que esses novos agricultores se mtegrem ao complexo agroindustnal e ao processo de globalização econômica hoje em curso.

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Pós-graduação em Ciências Biológicas (Farmacologia) - IBB

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Poultry facilities must provide an environment that ensures thermal comfort allowing the animal to express its genetic potential for production; and new tools are being applied to measure the thermal comfort, especially thermal cameras. The objective of this study was to evaluate the association of the surface temperature of the birds with those from the facilities, and estimate the sensible heat transfer. For this, the thermal conditions of rearing in two aviaries with different ventilation systems, during the period of March to April 2011 were recorded. The aviaries were divided into six quadrants for the registration of surface temperatures obtained using an infrared thermal camera. In each quadrant the ambient temperature, relative humidity and wind velocity during the obtention of images were also recorded. It was observed that the surface temperatures of birds are associated with the surface temperature of the rearing facilities (side curtains, roof and litter). In aviary with negative pressure higher wind speeds compared to the conventional one were recorded and; therefore, allowed a higher sensible heat transfer by birds, suggesting that this provided better conditions for thermal comfort.

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Pós-graduação em Agronomia (Agricultura) - FCA

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Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

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Pós-graduação em Relações Internacionais (UNESP - UNICAMP - PUC-SP) - FFC

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

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This text presents the first results of including research, in process, that it intends to investigate - in the period from 1950 to 1964 - the picture of the progressive political parties, the unions of the city and of the field, and the social movements marked by the national statement and for the anti-imperialism, especially those linked to the world labor perspective, discussing their proposals, differences, performances and commitments due to the political-cultural effervescence of this historical moment.

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The aim of this study was to evaluate the effect of different carbohydrate sources associated with sunflower oil on intake, digestibility of nutrients and nitrogen balance in diets of lambs. Twenty lambs were used, assigned in a completely randomized design with a 2 x 2 factorial arrangement of treatments with two sources of neutral detergent soluble carbohydrate, starch and neutral detergent soluble fiber, with and without the inclusion of 4.2% sunflower oil. The dry matter intake was not affected by carbohydrate sources and the inclusion of oil. Diets with a high percentage of starch provided higher digestibility of dry matter, starch and ether extract. The different sources of carbohydrates had no interference on digestibility of organic matter, crude protein, neutral detergent soluble fiber, nonfiber carbohydrates, neutral detergent fiber, hemicellulose and acid detergent fiber. The addition of oil in the diets increased the digestibility of ether extract. The combination of 4.2% oil in the diet high in soluble neutral detergent fiber had no influence on the nutrient digestibility, otherwise, the addition of oil at high starch diet caused a significant reduction in the digestibility of organic matter, neutral detergent fiber, hemicellulose and nonfiber carbohydrates. The quantities of nitrogen intake, absorbed and retained, did not differ as sources of carbohydrates and oil inclusion in the diet. The association of 4.2 % sunflower oil to the different sources of carbohydrates in the diet does not affect consumption and nitrogen metabolism in lambs. The addition of 4.2 % oil in the diet with high starch (28% of DM diet) promotes reduction in digestibility of organic matter, of fibrous and nonfibrous carbohydrate in the diet.

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This study consists in the observation and evaluation of the thermal behavior and distribution of wood composite walls, MDF – Medium Density Fiberboard, HDF – High Density Fiberboard, OSB – Oriented Strand Board and EGP – Edge Glued Panel. This study had the objective to present the experimental thermal behavior and to verify which one fit the thermal comfort standards for human labor For this work, was developed a thermal chamber, with one interchangeable side, so the wall prototypes would fit for each experiment. We studied walls made of MDF, HDF, OSB and EGP, which one had its own distinct behavior due to the panel construction. The EGP wall had shown the most reliable material for this usage at high temperatures. With this work, it was demonstrated the importance of choice for the right material and construction method for wooden composite walls, because if they were scaled poorly, the people exposed to them would be uncomfortable by the proportionate environment, and the costs for a resizing would be too high