4,658 research outputs found

    Influência da clarificação do mosto na composição e na qualidade do vinho branco.

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    Com a finalidade de estudar o efeito de diferentes sistemas de clarificação do mosto na composição e na qualidade do vinho branco, foram realizadas vinificações experimentais com a cultivar Trebbiano. Além da avaliação sensorial dos vinhos foram efetuadas análises de densidade, álcool, acidez volátil, pH, extrato seco, extrato seco reduzido, açficares totais, relação álcool em peso/extrato seco reduzido, cinzas, índice de cor e anidrido sulfuroso total. Também foram determinados os elementos minerais K, Na, Ca, Mg, Mn, Fe, Cu, Zn, Li e P, além dos compostos voláteis, aldeído acético, acetato de etila, metanol, propanol-l, metil-2 propanol-l e metil-2 + metil-3 butanol-l. O vinho cujo mosto foi clarificado com enzima pectolítica, solução de sílica, gelatina e bentonite na fermentação, foi escolhido como o melhor na avaliação sensorial. Analiticamente, o vinho obtido de mosto não clarificado apresentou teor mais elevado de álcoois superiores. O metil-2 propanol-l foi o álcool superior que mostrou maior dependéncia em relação ao sistema de clarificação utilizado

    Suco de uva.

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    Este manual tem como objetivo fornecer orientações básicas sobre o processo de elaboração do suco de uva, representando uma alternativa para o pequeno produtor, como já vem ocorrendo em alguns municípios da Serra Gaúcha, e promovendo o Surgimento de pequenas agroindústrias. Em longo prazo, poderá contribuir para melhor distribuição de renda e para dar maior estabilidade ao setor vitivinícola.bitstream/item/11888/2/00081370.pdfProjeto Minibibliotecas

    Elaboração de vinho branco fino.

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    Fatores naturais de solo e clima da maior parte das regiões vitícolas do Sul e Sudeste brasileiros determinam a aptidão enológica para a produção de vinho branco fino e espumante. Entre os fatores que contribuem com a tipicidade desses vinhos destacam-se a adaptação das cultivares de uvas brancas e seu nível de maturação que define a composição do mosto. Entre as principais características sensoriais salientamse o excelente aspecto visual, especialmente devido a sua limpidez e coloração amarelopalha, e o aroma que, embora sutil, é extremamente fino. No gosto, predomina o caráter ácido que lhe garante o frescor, fator de qualidade. A tecnologia de vinificação utilizada é moderna e comparável à aplicada nas melhores regiões vitícolas mundiais, especialmente quanto às etapas pré-fermentativas - extração e clarificação do mosto, na utilização de leveduras selecionadas e no controle da temperatura de fermentação. A constituição química desses vinhos caracteriza-se pelo baixo teor de extrato seco e cinzas, fatores indicativos de vinhos leves. Palavras-chave: Enologia. Vinificação. Tecnologia de elaboração. Característica sensorial. Composição. Mosto. Cultivar

    Search for New Physics with Jets and Missing Transverse Momentum in pp collisions at sqrt(s) = 7 TeV

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    A search for new physics is presented based on an event signature of at least three jets accompanied by large missing transverse momentum, using a data sample corresponding to an integrated luminosity of 36 inverse picobarns collected in proton--proton collisions at sqrt(s)=7 TeV with the CMS detector at the LHC. No excess of events is observed above the expected standard model backgrounds, which are all estimated from the data. Exclusion limits are presented for the constrained minimal supersymmetric extension of the standard model. Cross section limits are also presented using simplified models with new particles decaying to an undetected particle and one or two jets

    Search for anomalous t t-bar production in the highly-boosted all-hadronic final state

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    A search is presented for a massive particle, generically referred to as a Z', decaying into a t t-bar pair. The search focuses on Z' resonances that are sufficiently massive to produce highly Lorentz-boosted top quarks, which yield collimated decay products that are partially or fully merged into single jets. The analysis uses new methods to analyze jet substructure, providing suppression of the non-top multijet backgrounds. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 5 inverse femtobarns. Upper limits in the range of 1 pb are set on the product of the production cross section and branching fraction for a topcolor Z' modeled for several widths, as well as for a Randall--Sundrum Kaluza--Klein gluon. In addition, the results constrain any enhancement in t t-bar production beyond expectations of the standard model for t t-bar invariant masses larger than 1 TeV.Comment: Submitted to the Journal of High Energy Physics; this version includes a minor typo correction that will be submitted as an erratu

    Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV

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    The t t-bar production cross section (sigma[t t-bar]) is measured in proton-proton collisions at sqrt(s) = 7 TeV in data collected by the CMS experiment, corresponding to an integrated luminosity of 2.3 inverse femtobarns. The measurement is performed in events with two leptons (electrons or muons) in the final state, at least two jets identified as jets originating from b quarks, and the presence of an imbalance in transverse momentum. The measured value of sigma[t t-bar] for a top-quark mass of 172.5 GeV is 161.9 +/- 2.5 (stat.) +5.1/-5.0 (syst.) +/- 3.6(lumi.) pb, consistent with the prediction of the standard model.Comment: Replaced with published version. Included journal reference and DO

    Measurement of the Z/gamma* + b-jet cross section in pp collisions at 7 TeV

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    The production of b jets in association with a Z/gamma* boson is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV and recorded by the CMS detector. The inclusive cross section for Z/gamma* + b-jet production is measured in a sample corresponding to an integrated luminosity of 2.2 inverse femtobarns. The Z/gamma* + b-jet cross section with Z/gamma* to ll (where ll = ee or mu mu) for events with the invariant mass 60 < M(ll) < 120 GeV, at least one b jet at the hadron level with pT > 25 GeV and abs(eta) < 2.1, and a separation between the leptons and the jets of Delta R > 0.5 is found to be 5.84 +/- 0.08 (stat.) +/- 0.72 (syst.) +(0.25)/-(0.55) (theory) pb. The kinematic properties of the events are also studied and found to be in agreement with the predictions made by the MadGraph event generator with the parton shower and the hadronisation performed by PYTHIA.Comment: Submitted to the Journal of High Energy Physic

    Search for supersymmetry in events with b-quark jets and missing transverse energy in pp collisions at 7 TeV

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    Results are presented from a search for physics beyond the standard model based on events with large missing transverse energy, at least three jets, and at least one, two, or three b-quark jets. The study is performed using a sample of proton-proton collision data collected at sqrt(s) = 7 TeV with the CMS detector at the LHC in 2011. The integrated luminosity of the sample is 4.98 inverse femtobarns. The observed number of events is found to be consistent with the standard model expectation, which is evaluated using control samples in the data. The results are used to constrain cross sections for the production of supersymmetric particles decaying to b-quark-enriched final states in the context of simplified model spectra.Comment: Submitted to Physical Review
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