977 resultados para P. m acrospicula L. B. Cai


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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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The production cross section for a Wboson and two b jets is measured using proton-proton collisions at v root s = 7 TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 5.0 fb(-1). The W + bbevents are selected in the W..decay mode by requiring a muon with transverse momentum pT> 25GeVand pseudorapidity |eta| < 2.1, and exactly two b-tagged jets with pT> 25GeVand |eta| < 2.4. The measured W + bbproduction cross section in the fiducial region, calculated at the level of final-state particles, is s(pp. W + bb) xB(W..) = 0.53 +/- 0.05 (stat.) +/- 0.09 (syst.) +/- 0.06 (theo.) 0.01 (lum.) pb, in agreement with the standard model prediction. In addition, kinematic distributions of the W + bbsystem are in agreement with the predictions of a simulation usingMadGraphandpythia. (C) 2014 The Authors. Published by Elsevier B. V.

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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A Scientific Committee on Problems of the Environment Rapid Assessment (SCOPE-RAP) workshop was held on 18-22 March 2013. This workshop was hosted by the European Commission, JRC Centre at Ispra, Italy, and brought together 40 leading experts from Africa, Asia, Europe and North and South America to create four synthesis chapters aimed at identifying knowledge gaps, research requirements, and policy innovations. Given the forthcoming publication by CABI of a book volume of the outcomes of the SCOPE-RAP in 2014, this workshop report provides an update on the global societal challenge of soil carbon management and some of the main issues and solutions that were identified in the four working sessions.

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The first search at the LHC for the extinction of QCD jet production is presented, using data collected with the CMS detector corresponding to an integrated luminosity of 10.7 fb-1 of proton-proton collisions at a center-of-mass energy of 8 TeV. The extinction model studied in this analysis is motivated by the search for signatures of strong gravity at the TeV scale (terascale gravity) and assumes the existence of string couplings in the strong-coupling limit. In this limit, the string model predicts the suppression of all high-transverse-momentum standard model processes, including jet production, beyond a certain energy scale. To test this prediction, the measured transverse-momentum spectrum is compared to the theoretical prediction of the standard model. No significant deficit of events is found at high transverse momentum. A 95% confidence level lower limit of 3.3 TeV is set on the extinction mass scale.

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecno³gico (CNPq)