1,888 research outputs found

    Resgate de germoplasma vegetal de espécies-alvo na área de influência do Aproveitamento Hidrelétrico Barra Grande (RS, SC).

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    Lythraceae.

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    MARHOLD, K.; FELINER, G. N. (Ed.). IOPB Column

    Efeito de diferentes substratos no desenvolvimento de aroeira-vermelha (Schinus terebinthifolius Raddi).

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    Foram testados diferentes substratos, com o objetivo de verificar os que proporcionam melhores condições para o desenvolvimento de mudas de aroeira-vermelha (Schinus terebinthifolius Raddi), O delineamento experimental utilizado foi em blocos ao acaso com cinco substratos (areia, solo, areia + solo, areia + esterco de bovino e areia + solo + esterco de bovino, sendo as combinações em proporções de 50% de cada material) em quatro repetições. O trabalho foi realizado de setembro de 2007 a dezembro de 2008, em temperatura ambiente, na Embrapa Semi-Árido, em Petrolina, PE. Foram realizadas as avaliações aos 360 dias após o plantio. Em relação ao desenvolvimento do sistema radicular das mudas de aroeira-vermelha, verificou-se que no substrato com areia + esterco e areia + solo + esterco, todas as mudas apresentaram os maiores valores em termos de comprimento. O crescimento em altura das mudas foi influenciado pelos diferentes substratos analisados. Entre os substratos, o melhor foi o com areia + esterco de bovino, que provocou maior crescimento das plantas e a maior produção de matéria seca

    COMPARATIVE ANALYSIS OF THE EFFICIENCY OF THERMAL SYSTEMS BUILT WITH REFLECTIVE INSULATORS WITH AND WITHOUT VACUUM

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    The use of reflective surfaces functioning as thermal insulators has grown significantly over the years. Reflective thermal insulators are materials that have several characteristics such as low emissivity, low absorptivity and high reflectivity in the infrared spectrum. The use of these materials has grown very much lately, since they contain several important radioactive properties that minimize the heat loss of thermal systems and cooling systems that are used to block the heat on the roof of buildings. A system made of three surfaces of 430 stainless steel mirror was built to analyze the influence of reflective surfaces as a way to reduce the heat loss and thereby conserve the energy of a thermal system. The system was analyzed both with and without the presence of vacuum, and then compared with a system that contained glass wool between the stainless steel mirror walls, since this insulator is considered resistive and also broadly used around the world in thermal systems. The reflectivity and emissivity of the surfaces used were also measured in this experiment. A type K thermocouple was fixed on the wall of the system to obtain the temperature of the stainless steel mirror surfaces and to analyze the thermal behavior of each configuration used. The results showed an efficiency of 13% when the reflective surfaces were used to minimize the heat loss of the thermal system. However, the system with vacuum had the best outcome, a 60% efficiency. Both of these were compared to the system made of glass wool as a thermal insulator
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