84 research outputs found

    Sphagnum auriculatum Schimp. in Portugal with late Quaternary occurrences

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    Sphagnum auriculatum Schimp. occurs in Portugal mainly in the northem and central parts of the country where the precipitation rates vary between 800-2800 mm/yr. It occupies the atlantic and pre-atlantic temtories though two of the collections were made south of Lisbon, in the mediterranean tenitory. Holocene records exist 50 km south of these locations suggesting a wider distribution of this species towards the south in the Quaternary. Climate changes together with habitat disturbances may be responsable for its disappearance from these areas.S. auriculatum Schimp es troba a Portugal, principalment, al nord i centre del país, on hi ha una precipitació anual de 800 a 2800 mm. Ocupa els territoris atlàntics i subatlàntics tret de dues localitats al sud de Lisboa, de tipus mediterrani. S'han trobat registres holocènics a 50 km al sud d'aquestes localitats i això fa pensar que aquesta espècie presentava, al Quaternari, una àrea de distribució més àmplia. Canvis climàtics juntament amb alteracions del medi poden ser la causa de la desaparició de l'espècie en aquestes àrees

    Estabelecimento de acessos de Passiflora cincinnata Mast. por organogênese direta in vivo de segmentos radiculares.

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    O maracujá-do-mato (Passiflora cincinnata Mast.) é uma das espécies nativas de potencial econômico do gênero Passiflora, sendo u ma importante alternativa em programas de melhoramento genético, principalmente para obtenção de variedades tolerantes e/ou resistentes a algumas doenças da principal espécie plantada comercialmente

    3-3-1 exotic quark search at CERN LEPII-LHC

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    The 3-3-1 electroweak model is the simplest chiral extension of the standard model which predicts single and double charged bileptons and exotic quarks carrying -4/3 and 5/3 units of the positron charge. In this paper we study the possibilities of the production and decay of one of these exotic quarks at CERN LEPII-LHC collider. For typical vector bilepton, exotic quark masses and mixing angles we obtained between 20 and 750 events per year. Angular distributions are also presented.Comment: 5 pages, RevTex 3.1, 9 eps figures, to appear in Phys. Rev.

    Avaliação de emergência de acessos de Passiflora cincinnata Mast, do banco de germoplasma de maracujá (BAG) da Embrapa Semi-Árido.

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    O objetivo deste trabalho foi avaliar a emergência de 32 acessos de P. cincinnata do BAG de maracujá da Embrapa Semi-Árido que se encontram armazenadas a 10º C e 40% de UR

    Estudio técnico del uso de energía solar y biogás en vehículos eléctricos en Ilhabela-Brasil

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    energía se han mostrado como una excelente oportunidad para la generación de electricidad. En este trabajo se presenta el estudio de uno de estos sistemas considerando dos fuentes de energía disponibles (solar – biogás) en la isla Ilhabela en el estado de San Pablo – Brasil, con miras a dotar de energía a vehículos eléctricos. Este estudio se basa primeramente en el cálculo de la demanda de energía de los vehículos eléctricos en esta isla. Luego se determina la capacidad de producción de biogás en Ilhabela. Posteriormente se efectúa un análisis energético de la planta con una microturbina a biogás para conocer la energía producida y la demanda de biogás. Como último paso, se calcula la cantidad de energía necesaria a ser generada con la planta fotovoltaica. Los resultados muestran que, considerando un índice de inserción de mercado del 4 % de los vehículos eléctricos, la demanda energética media es de 46 327 kWh/mes. Por otro lado, la capacidad de producción de biogás en la isla es dos veces mayor a la necesaria para generar 16 200 kWh/mes. Finalmente, la planta fotovoltaica producirá 30 127 kWh/mes.// Currently, Hybrid Power Systems (HPS) have been shown as an excellent opportunity for generation of electricity. This paper presents the study of a hybrid system considering two energy sources (solar - biogas) available in the city Ilhabela island in the state of São Paulo – Brazil. This system will supply electricity to electric vehicles. The study is based on the calculation of the energy demand of the electric vehicles on the island. Then the capacity of biogas production in Ilhabela is determined. Subsequently, in order to know the energy produced and the amount of biogas needed by the microturbine, an energy analysis of this plant is carried out. Last, the energy needed to be generated with the photovoltaic plant is calculated. The results show that, considering a market insertion index of 4% of electric vehicles, the average energy demand is 46.327 kWh/month. On the other hand, the amount of biogas produced on the island is twice that needed to generate 16.200 kWh/month. Finally, the solar plant will produce 30.127 kWh/month
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