5,256 research outputs found

    HERA-B Framework for Online Calibration and Alignment

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    This paper describes the architecture and implementation of the HERA-B framework for online calibration and alignment. At HERA-B the performance of all trigger levels, including the online reconstruction, strongly depends on using the appropriate calibration and alignment constants, which might change during data taking. A system to monitor, recompute and distribute those constants to online processes has been integrated in the data acquisition and trigger systems.Comment: Submitted to NIM A. 4 figures, 15 page

    The Hamiltonian BRST quantization of a noncommutative nonabelian gauge theory and its Seiberg-Witten map

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    We consider the Hamiltonian BRST quantization of a noncommutative non abelian gauge theory. The Seiberg-Witten map of all phase-space variables, including multipliers, ghosts and their momenta, is given in first order in the noncommutative parameter θ\theta. We show that there exists a complete consistence between the gauge structures of the original and of the mapped theories, derived in a canonical way, once we appropriately choose the map solutions.Comment: 10 pages, Latex. Address adde

    Resultados preliminares do projeto zoneamento do déficit hídrico do TSA utilizando técnicas de teledetecção espacial.

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    Definição do problema; Apresentação do organograma de trabalho a ser realizado; Dados tratados; Constituição do arquivo bruto.bitstream/item/143278/1/ID-31857.pdfNão publicado

    Hamiltonian Embedding of SU(2) Higgs Model in the Unitary Gauge

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    Following systematically the generalized Hamiltonian approach of Batalin, Fradkin and Tyutin (BFT), we embed the second-class non-abelian SU(2) Higgs model in the unitary gauge into a gauge invariant theory. The strongly involutive Hamiltonian and constraints are obtained as an infinite power series in the auxiliary fields. Furthermore, comparing these results with those obtained from the gauged second class Lagrangian, we arrive at a simple interpretation for the first class Hamiltonian, constraints and observables.Comment: 13 pages, Latex, no figure

    Fusarium wilt of banana in Brazil: current state and research advances at Embrapa towards sustainable disease management.

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    Fusarium wilt (FW) impairs banana production in large areas of Brazil, affecting mainly the most profitable cultivars: \'Maçã\' (Silk, AAB) and ‘Prata’ (Pomme, AAB). Plant nutrition is frequently associated with disease severity, but little is known about the banana-FW pathosystem in Brazil. In this work we samples 18 farms in four different production systems in SP. In each farm areas with low (FOC-) and high (FOC+) incidence of FW were selected for plant analysis. Lamina of the third leaf were sampled and analyzed for nutrient content. The main differences between FOC- and FOC+ areas were related to N, K and Ca contents. The most outstanding effect of FW on plant nutrition was the reduction of K and Ca. This might be explained by the fact K and Ca are highly linked to water transport and FW causes severe damages in the vascular system. Interestingly, a relative increase of N content was also observed in some FOC+ plants. This may be due to a concentration effect as a result of growth reduction caused by FW. Our data suggest FW triggers a feedback mechanism towards destabilization in banana. The significant reduction of Ca and K detected on infected plants and the documented role of these nutrients on plant resistance, open opportunities to better understand soil-based management strategies of FW in banana

    Utilizacao de materiais flutuantes no controle da evaporacao no Tropico Semi-Arido (TSA).

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    Materiais flutuantes foram testados em tanques tipo Classe A, com o objetivo de reduzir as perdas por evaporacao das superficies livres d'agua. As coberturas consistiram de discos impoermaveis compostos de vermiculita, parafina e cera de carnauba (Copernicia cerifera Mart.); esferas de barro vitrificadas; esferas de barro nao vitrificadas; e discos de isopor impreganados de uma mistura de cera de carnauba mais parafina derretida. Cada tratamento cobriu 80% da superficie exposta do tanque, apresentando os seguintes resultados no controle das perdas: 54%, 60%, 50% e 61% respectivamente. A eficiencia apresentada indicou que as coberturas empregadas poderao ser viaveis

    Correlação fenotípica em acessos diploides (AA) melhorados de bananeira.

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    A bananicultura destaca-se como uma atividade de grande importância econômica e social. No Brasil, verifica-se o cultivo da bananeira em todas as regiões geográficas, da faixa litorânea aos planaltos do interior. Os problemas enfrentados pela cultura são vários, abrangendo desde produtividade e qualidade dos frutos inadequadas, a questões mais específicas, como resistência a pragas (SILVA et al., 2005; CORDEIRO et al., 2005)
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