328 research outputs found

    Retrospective and comparative study of forty-three eyes with acute hydrops among five-hundred-sixty-seven keratoconus cases

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    PURPOSE: To compare clinical characteristics and surgical out comes between keratoconus cases with and without acute hydrops (AH). METHODS: All keratoconus cases followed up at the Hospital Universitário Antônio Pedro - UFF and at Clinica Oftamológica Souza Pena between 1982 and 2000 were reviewed. Main analyzed outcome parameters were: visual acuity, follow-up time since diagnosis, type of visual correction, morphological and keratometric classification, and surgical results. RESULTS: The overall acute hydrops incidence was 5.8%. Gender, keratoconus family history, atopy did not differ significantly between the two groups. Among acute hydrops cases, 72.7% were classified as peripheral cones, against 21.4% of the control cases (p < 0.05). Overall, 19% of the patients needed penetrating keratoplasty (PK). Out of 1062 eyes that did not develop acute hydrops, 8.4% underwent PK, compared to 88.4 % of the acute hydrops eyes (p < 0.05). Surgical outcomes showed no significant difference between the two groups. CONCLUSION: Peripheral cones were more frequently related to acute hydrops, and consequently, to PK. Keratoconus surgical treatment results were similar in cases with and without acute hydrops.OBJETIVO: Comparar as características clínicas e os resultados do tratamento cirúrgico entre casos com e sem hidropisia aguda, do total de 567 pacientes com ceratocone. MÉTODOS: Foram revistos os prontuários de todos os casos de ceratocone acompanhados entre 1982 e 2000 no Hospital Universitário Antônio Pedro - UFF e na Clínica Oftalmológica Souza Pena, em Niterói. Acuidade visual, tempo de evolução, tipo de correção ótica, morfologia do ceratocone, classificação ceratométrica e resultados cirúrgicos foram as principais variáveis comparadas entre os dois grupos. RESULTADOS: A incidência de hidropisia aguda foi 5,8%. Não houve diferença estatisticamente significativa entre os grupos quanto ao sexo, história familiar e atopia. No grupo da hidropisia aguda, 72,7% dos casos foram classificados como periféricos, contrastando com 21,4% do grupo controle (p < 0,05). Dezenove por cento dos pacientes foram submetidos à ceratoplastia penetrante. Dentre os 1062 olhos que não desenvolveram hidropisia aguda, 8,4% foram operados, ao passo que 88,4% dos olhos com hidropisia submeteram-se ao transplante de córnea (p < 0,05). O resultado pós-operatório não diferiu entre os dois grupos. CONCLUSÃO: O ceratocone periférico esteve mais associado à hidropisia aguda e, conseqüentemente, à indicação de ceratoplastia penetrante. O prognóstico do tratamento cirúrgico não diferiu entre os grupos desta amostra.Universidade Federal de São Paulo (UNIFESP) Escola Paulista de MedicinaUniversidade Federal Fluminense Serviço de OftalmologiaHospital da PiedadeUNIFESP, EPMSciEL

    Search for new physics with dijet angular distributions in proton-proton collisions at root S = 13 TeV

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    Search for light bosons in decays of the 125 GeV Higgs boson in proton-proton collisions at root s=8 TeV

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    Search for supersymmetry in proton-proton collisions at 13 TeV using identified top quarks

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    A search for supersymmetry is presented based on proton-proton collision events containing identified hadronically decaying top quarks, no leptons, and an imbalance p(T)(miss) in transverse momentum. The data were collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb(-1). Search regions are defined in terms of the multiplicity of bottom quark jet and top quark candidates, the p(T)(miss) , the scalar sum of jet transverse momenta, and themT2 mass variable. No statistically significant excess of events is observed relative to the expectation from the standard model. Lower limits on the masses of supersymmetric particles are determined at 95% confidence level in the context of simplified models with top quark production. For a model with direct top squark pair production followed by the decay of each top squark to a top quark and a neutralino, top squark masses up to 1020 GeVand neutralino masses up to 430 GeVare excluded. For amodel with pair production of gluinos followed by the decay of each gluino to a top quark-antiquark pair and a neutralino, gluino masses up to 2040 GeVand neutralino masses up to 1150 GeVare excluded. These limits extend previous results.Peer reviewe

    Measurement of the top quark mass using single top quark events in proton-proton collisions at root s=8 TeV

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    Optimasi Portofolio Resiko Menggunakan Model Markowitz MVO Dikaitkan dengan Keterbatasan Manusia dalam Memprediksi Masa Depan dalam Perspektif Al-Qur`an

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    Risk portfolio on modern finance has become increasingly technical, requiring the use of sophisticated mathematical tools in both research and practice. Since companies cannot insure themselves completely against risk, as human incompetence in predicting the future precisely that written in Al-Quran surah Luqman verse 34, they have to manage it to yield an optimal portfolio. The objective here is to minimize the variance among all portfolios, or alternatively, to maximize expected return among all portfolios that has at least a certain expected return. Furthermore, this study focuses on optimizing risk portfolio so called Markowitz MVO (Mean-Variance Optimization). Some theoretical frameworks for analysis are arithmetic mean, geometric mean, variance, covariance, linear programming, and quadratic programming. Moreover, finding a minimum variance portfolio produces a convex quadratic programming, that is minimizing the objective function ðð¥with constraintsð ð 𥠥 ðandð´ð¥ = ð. The outcome of this research is the solution of optimal risk portofolio in some investments that could be finished smoothly using MATLAB R2007b software together with its graphic analysis

    Search for single production of vector-like quarks decaying into a b quark and a W boson in proton-proton collisions at root s=13 TeV

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    Cross section measurement of t-channel single top quark production in pp collisions at root s=13 TeV

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    Pseudorapidity distributions of charged hadrons in proton-lead collisions at root s(NN)=5:02 and 8.16 TeV

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    The pseudorapidity distributions of charged hadrons in proton-lead collisions at nucleon-nucleon center-of-mass energies root s(NN) = 5.02 and 8.16 TeV are presented. The measurements are based on data samples collected by the CMS experiment at the LHC. The number of primary charged hadrons produced in non-single-diffractive proton-lead collisions is determined in the pseudorapidity range vertical bar eta(lab)vertical bar vertical bar(vertical bar eta cm vertical bar) <0.5 are 17.1 +/- 0.01 (stat) +/- 0.59 (syst) and 20.10 +/- 0.01 (stat) +/- 0.5(syst) at root s(NN) = 5.02 and 8.16 TeV, respectively. The particle densities per participant nucleon are compared to similar measurements in proton-proton, proton-nucleus, and nucleus-nucleus collisions.Peer reviewe
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