359 research outputs found

    AVALIAÇÃO DO PROCESSO DE PRODUÇÃO DE MICROALGAS DO SEMIÁRIDO E LITORAL ALAGOANO VISANDO À PRODUÇÃO DE BIODIESEL

    Get PDF
    Biodiesel a partir de organismos unicelulares é tecnicamente viável quando as condições de cultivo são satisfatórias favorecidas por meios sintéticos e naturais que desempenham importantes funções para o crescimento das culturas e aumento da biomassa. As variáveis abióticas, como pH e temperatura, podem implicar no crescimento das espécies cultivadas. A referida pesquisa teve como ojetivo  ampliar os conhecimentos acerca de  cultivos de microalgas em laboratório, a partir, de espécies isoladas e cultivadas em diferentes meios  de cultivo (sintéticos/naturais) bem como a obtenção de óleos e lipídeos, por processos de extração com solvente “hexano”, e caracterização do óleos obtidos via “transesterificação. As microalgas foram obtidas por meio de arrastos horizontais subsuperficiais com duração de cinco minutos, com rede de plâncton de malha de 20μm,em açudes de regiões do Semiárido e tanques de cultivo de tilapia na praia de Ipioca. O material  utilizado para identificação das microalgas, foi fixado em formol neutro a 4%. As amostras destinadas ao cultivo, foram transportadas assepticamente sob aeração.O filo Chlorophyta foi o melhor representado com 45 táxons (64%). Verificamos que as microalgas quando cultivadas em laboratório sob condições controladas e meios sintéticos em quantidades adequadas, podem  favorecer  o crescimento satisfatório das culturas, a depender da espécie cultivada. Dentre as clorofíceas, foi possível o isolamento dos gêneros Desmodesmus sp., e Westella botryoides (West) De Wildeman. Os meios utilizados influenciaram sobre as taxas de crescimento das microalgas cultivadas. Os percentuais de óleo e lípideos das amostras, foram de  2,63% e  96,68%, respectivamente

    AVALIAÇÃO DO PROCESSO DE PRODUÇÃO DE MICROALGAS DO SEMIÁRIDO E LITORAL ALAGOANO VISANDO À PRODUÇÃO DE BIODIESEL

    Get PDF
    Biodiesel a partir de organismos unicelulares é tecnicamente viável quando as condições de cultivo são satisfatórias favorecidas por meios sintéticos e naturais que desempenham importantes funções para o crescimento das culturas e aumento da biomassa. As variáveis abióticas, como pH e temperatura, podem implicar no crescimento das espécies cultivadas. A referida pesquisa teve como ojetivo  ampliar os conhecimentos acerca de  cultivos de microalgas em laboratório, a partir, de espécies isoladas e cultivadas em diferentes meios  de cultivo (sintéticos/naturais) bem como a obtenção de óleos e lipídeos, por processos de extração com solvente “hexano”, e caracterização do óleos obtidos via “transesterificação. As microalgas foram obtidas por meio de arrastos horizontais subsuperficiais com duração de cinco minutos, com rede de plâncton de malha de 20μm,em açudes de regiões do Semiárido e tanques de cultivo de tilapia na praia de Ipioca. O material  utilizado para identificação das microalgas, foi fixado em formol neutro a 4%. As amostras destinadas ao cultivo, foram transportadas assepticamente sob aeração.O filo Chlorophyta foi o melhor representado com 45 táxons (64%). Verificamos que as microalgas quando cultivadas em laboratório sob condições controladas e meios sintéticos em quantidades adequadas, podem  favorecer  o crescimento satisfatório das culturas, a depender da espécie cultivada. Dentre as clorofíceas, foi possível o isolamento dos gêneros Desmodesmus sp., e Westella botryoides (West) De Wildeman. Os meios utilizados influenciaram sobre as taxas de crescimento das microalgas cultivadas. Os percentuais de óleo e lípideos das amostras, foram de  2,63% e  96,68%, respectivamente

    Multidifferential study of identified charged hadron distributions in ZZ-tagged jets in proton-proton collisions at s=\sqrt{s}=13 TeV

    Full text link
    Jet fragmentation functions are measured for the first time in proton-proton collisions for charged pions, kaons, and protons within jets recoiling against a ZZ boson. The charged-hadron distributions are studied longitudinally and transversely to the jet direction for jets with transverse momentum 20 <pT<100< p_{\textrm{T}} < 100 GeV and in the pseudorapidity range 2.5<η<42.5 < \eta < 4. The data sample was collected with the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.64 fb1^{-1}. Triple differential distributions as a function of the hadron longitudinal momentum fraction, hadron transverse momentum, and jet transverse momentum are also measured for the first time. This helps constrain transverse-momentum-dependent fragmentation functions. Differences in the shapes and magnitudes of the measured distributions for the different hadron species provide insights into the hadronization process for jets predominantly initiated by light quarks.Comment: All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-013.html (LHCb public pages

    Study of the BΛc+ΛˉcKB^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} decay

    Full text link
    The decay BΛc+ΛˉcKB^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} is studied in proton-proton collisions at a center-of-mass energy of s=13\sqrt{s}=13 TeV using data corresponding to an integrated luminosity of 5 fb1\mathrm{fb}^{-1} collected by the LHCb experiment. In the Λc+K\Lambda_{c}^+ K^{-} system, the Ξc(2930)0\Xi_{c}(2930)^{0} state observed at the BaBar and Belle experiments is resolved into two narrower states, Ξc(2923)0\Xi_{c}(2923)^{0} and Ξc(2939)0\Xi_{c}(2939)^{0}, whose masses and widths are measured to be m(Ξc(2923)0)=2924.5±0.4±1.1MeV,m(Ξc(2939)0)=2938.5±0.9±2.3MeV,Γ(Ξc(2923)0)=0004.8±0.9±1.5MeV,Γ(Ξc(2939)0)=0011.0±1.9±7.5MeV, m(\Xi_{c}(2923)^{0}) = 2924.5 \pm 0.4 \pm 1.1 \,\mathrm{MeV}, \\ m(\Xi_{c}(2939)^{0}) = 2938.5 \pm 0.9 \pm 2.3 \,\mathrm{MeV}, \\ \Gamma(\Xi_{c}(2923)^{0}) = \phantom{000}4.8 \pm 0.9 \pm 1.5 \,\mathrm{MeV},\\ \Gamma(\Xi_{c}(2939)^{0}) = \phantom{00}11.0 \pm 1.9 \pm 7.5 \,\mathrm{MeV}, where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt Λc+K\Lambda_{c}^{+} K^{-} sample. Evidence of a new Ξc(2880)0\Xi_{c}(2880)^{0} state is found with a local significance of 3.8σ3.8\,\sigma, whose mass and width are measured to be 2881.8±3.1±8.5MeV2881.8 \pm 3.1 \pm 8.5\,\mathrm{MeV} and 12.4±5.3±5.8MeV12.4 \pm 5.3 \pm 5.8 \,\mathrm{MeV}, respectively. In addition, evidence of a new decay mode Ξc(2790)0Λc+K\Xi_{c}(2790)^{0} \to \Lambda_{c}^{+} K^{-} is found with a significance of 3.7σ3.7\,\sigma. The relative branching fraction of BΛc+ΛˉcKB^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} with respect to the BD+DKB^{-} \to D^{+} D^{-} K^{-} decay is measured to be 2.36±0.11±0.22±0.252.36 \pm 0.11 \pm 0.22 \pm 0.25, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-028.html (LHCb public pages

    Measurement of the ratios of branching fractions R(D)\mathcal{R}(D^{*}) and R(D0)\mathcal{R}(D^{0})

    Full text link
    The ratios of branching fractions R(D)B(BˉDτνˉτ)/B(BˉDμνˉμ)\mathcal{R}(D^{*})\equiv\mathcal{B}(\bar{B}\to D^{*}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(\bar{B}\to D^{*}\mu^{-}\bar{\nu}_{\mu}) and R(D0)B(BD0τνˉτ)/B(BD0μνˉμ)\mathcal{R}(D^{0})\equiv\mathcal{B}(B^{-}\to D^{0}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(B^{-}\to D^{0}\mu^{-}\bar{\nu}_{\mu}) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb1{ }^{-1} of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode τμντνˉμ\tau^{-}\to\mu^{-}\nu_{\tau}\bar{\nu}_{\mu}. The measured values are R(D)=0.281±0.018±0.024\mathcal{R}(D^{*})=0.281\pm0.018\pm0.024 and R(D0)=0.441±0.060±0.066\mathcal{R}(D^{0})=0.441\pm0.060\pm0.066, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is ρ=0.43\rho=-0.43. Results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the Standard Model.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-039.html (LHCb public pages

    First measurement of the Zμ+μZ\rightarrow \mu^+ \mu^- angular coefficients in the forward region of pppp collisions at s=13\sqrt{s}=13 TeV

    No full text
    The first study of the angular distribution of μ+μ\mu^+ \mu^- pairs produced in the forward rapidity region via the Drell-Yan reaction ppγ/Z+Xl+l+Xpp \rightarrow \gamma^{*}/Z +X \rightarrow l^+ l^- + X is presented, using data collected with the LHCb detector at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.1 fb1\rm{fb}^{-1}. The coefficients of the five leading terms in the angular distribution are determined as a function of the dimuon transverse momentum and rapidity. The results are compared to various theoretical predictions of the ZZ-boson production mechanism and can also be used to probe transverse-momentum-dependent parton distributions within the proton

    Measurement of the charm mixing parameter yCPyCPKπy_{CP} - y_{CP}^{K\pi} using two-body D0D^0 meson decays

    No full text
    A measurement of the ratios of the effective decay widths of D0ππ+D^0 \to \pi^-\pi^+ and D0KK+D^0 \to K^-K^+ decays over that of D0Kπ+D^0 \to K^-\pi^+ decays is performed with the LHCb experiment using proton-proton collisions at a centre-of-mass energy of 13TeV13 \, \mathrm{TeV}, corresponding to an integrated luminosity of 6fb16 \, \mathrm{fb^{-1}}. These observables give access to the charm mixing parameters yCPππyCPKπy_{CP}^{\pi\pi} - y_{CP}^{K\pi} and yCPKKyCPKπy_{CP}^{KK} - y_{CP}^{K\pi}, and are measured as yCPππyCPKπ=(6.57±0.53±0.16)×103y_{CP}^{\pi\pi} - y_{CP}^{K\pi} = (6.57 \pm 0.53 \pm 0.16) \times 10^{-3}, yCPKKyCPKπ=(7.08±0.30±0.14)×103y_{CP}^{KK} - y_{CP}^{K\pi} = (7.08 \pm 0.30 \pm 0.14) \times 10^{-3}, where the first uncertainties are statistical and the second systematic. The combination of the two measurements is yCPyCPKπ=(6.96±0.26±0.13)×103y_{CP} - y_{CP}^{K\pi} = (6.96 \pm 0.26 \pm 0.13) \times 10^{-3}, which is four times more precise than the previous world average

    First measurement of the Zμ+μZ\rightarrow \mu^+ \mu^- angular coefficients in the forward region of pppp collisions at s=13\sqrt{s}=13 TeV

    No full text
    The first study of the angular distribution of μ+μ\mu^+ \mu^- pairs produced in the forward rapidity region via the Drell-Yan reaction ppγ/Z+Xl+l+Xpp \rightarrow \gamma^{*}/Z +X \rightarrow l^+ l^- + X is presented, using data collected with the LHCb detector at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.1 fb1\rm{fb}^{-1}. The coefficients of the five leading terms in the angular distribution are determined as a function of the dimuon transverse momentum and rapidity. The results are compared to various theoretical predictions of the ZZ-boson production mechanism and can also be used to probe transverse-momentum-dependent parton distributions within the proton

    Observation of sizeable ω\omega contribution to χc1(3872)π+πJ/ψ\chi_{c1}(3872) \to \pi^+\pi^- J/\psi decays

    No full text
    Resonant structures in the dipion mass spectrum from χc1(3872)π+πJ/ψ\chi_{c1}(3872)\to\pi^+\pi^- J/\psi decays, produced via B+K+χc1(3872)B^+\to K^+\chi_{c1}(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb1^{-1}. A sizeable contribution from the isospin conserving χc1(3872)ωJ/ψ\chi_{c1}(3872)\to\omega J/\psi decay is established for the first time, (21.4±2.3±2.0)%(21.4\pm2.3\pm2.0)\%, with a significance of more than 7.1σ7.1\sigma. The amplitude of isospin violating decay, χc1(3872)ρ0J/ψ\chi_{c1}(3872)\to\rho^0 J/\psi, relative to isospin conserving decay, χc1(3872)ωJ/ψ\chi_{c1}(3872)\to\omega J/\psi, is properly determined, and it is a factor of six larger than expected for a pure charmonium state.Resonant structures in the dipion mass spectrum from χc1(3872)→π+π-J/ψ decays, produced via B+→K+χc1(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9  fb-1. A sizeable contribution from the isospin conserving χc1(3872)→ωJ/ψ decay is established for the first time, (21.4±2.3±2.0)%, with a significance of more than 7.1σ. The amplitude of isospin violating decay, χc1(3872)→ρ0J/ψ, relative to isospin conserving decay, χc1(3872)→ωJ/ψ, is properly determined, and it is a factor of 6 larger than expected for a pure charmonium state.Resonant structures in the dipion mass spectrum from χc1(3872)π+πJ/ψ\chi_{c1}(3872)\to\pi^+\pi^- J/\psi decays, produced via B+K+χc1(3872)B^+\to K^+\chi_{c1}(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb1fb^{-1}. A sizeable contribution from the isospin conserving χc1(3872)ωJ/ψ\chi_{c1}(3872)\to\omega J/\psi decay is established for the first time, (21.4±2.3±2.0)%(21.4\pm2.3\pm2.0)\%, with a significance of more than 7.1σ7.1\sigma. The amplitude of isospin violating decay, χc1(3872)ρ0J/ψ\chi_{c1}(3872)\to\rho^0 J/\psi, relative to isospin conserving decay, χc1(3872)ωJ/ψ\chi_{c1}(3872)\to\omega J/\psi, is properly determined, and it is a factor of six larger than expected for a pure charmonium state

    Measurement of the charm mixing parameter yCPyCPKπy_{CP} - y_{CP}^{K\pi} using two-body D0D^0 meson decays

    No full text
    International audienceA measurement of the ratios of the effective decay widths of D0→π-π+ and D0→K-K+ decays over that of D0→K-π+ decays is performed with the LHCb experiment using proton–proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6  fb-1. These observables give access to the charm mixing parameters yCPππ-yCPKπ and yCPKK-yCPKπ, and are measured as yCPππ-yCPKπ=(6.57±0.53±0.16)×10-3, yCPKK-yCPKπ=(7.08±0.30±0.14)×10-3, where the first uncertainties are statistical and the second systematic. The combination of the two measurements is yCP-yCPKπ=(6.96±0.26±0.13)×10-3, which is four times more precise than the previous world average
    corecore