A geospatial approach for mapping the earthquake-induced liquefaction risk at the european scale

none6noopenBozzoni Francesca, Roberta Bonì, Daniele Conca, Claudia Meisina, Carlo G. Lai, Elisa ZuccoloBozzoni, Francesca; Boni', Roberta; Daniele, Conca; Claudia, Meisina; Lai, Carlo G.; Elisa, Zuccol

Uso de las redes sociales en los estudiantes del 1° grado, Sección “A” del Nivel Secundaria del Centro de Educación Básica Alternativa “Lord Kelvin” del distrito y provincia de Moyobamba, año 2018

La presente investigación denominada: “Uso de las redes sociales en los estudiantes del 1° grado, Sección “A” del Nivel Secundaria del Centro de Educación Básica Alternativa “Lord Kelvin” del distrito y provincia de Moyobamba, año 2018”, es de tipo de No experimental, con un enfoque cuantitativo. El objetivo de la investigación fue de describir que redes sociales utilizan más los estudiantes del 1° grado, Sección “A” del Nivel Secundaria, teniendo en cuenta que en la actualidad y tras los avances tecnológicos existe mayor acceso a las redes sociales. La metodología utilizada corresponde a una investigación de tipo descriptivo simple, en donde se utilizó la encuesta y el cuestionario para la recolección de datos aplicado a una muestra de 28 alumnos en total, de los cuales 20 estudiantes son hombres y 08 estudiantes son mujeres. Para el análisis de datos se ha utilizado las tablas de frecuencia simples y de doble entrada para relacionar la variable de estudio y para visualizar los resultados se utilizó los gráficos. En la investigación se obtuvo a los siguientes resultados y conclusiones que el 43% de estudiantes utilizan de manera excesiva las redes sociales, mientras que 25% lo utiliza de manera moderada; sin embargo, el 32% utiliza las redes sociales de manera eventual. Siendo el Facebook la red social más utilizada con un 93% de estudiantes

Quantum breaking time near classical equilibrium points

By using numerical and semiclassical methods, we evaluate the quantum breaking, or Ehrenfest time for a wave packet localized around classical equilibrium points of autonomous one-dimensional systems with polynomial potentials. We find that the Ehrenfest time diverges logarithmically with the inverse of the Planck constant whenever the equilibrium point is exponentially unstable. For stable equilibrium points, we have a power law divergence with exponent determined by the degree of the potential near the equilibrium point.Comment: 4 pages, 5 figure

Measurement of branching fraction and direct CPCP asymmetry in charmless B+→K+K−π+B^+ \to K^+K^- \pi^+ decays at Belle

We report a study of the charmless hadronic decay of the charged $B$ meson to the three-body final state $K^+ K^- \pi^+$. The results are based on a data sample that contains $772\times10^6$ $B \bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The measured inclusive branching fraction and the direct $CP$ asymmetry are $(5.38\pm0.40\pm0.35)\times 10^{-6}$ and $-0.170\pm0.073\pm0.017$, respectively, where the first uncertainties are statistical and the second are systematic. The $K^{+}K^{-}$ invariant mass distribution of the signal candidates shows an excess in the region below $1.5$ GeV/$c^2$, which is consistent with the previous studies from BaBar and LHCb. In addition, strong evidence of a large direct $CP$ asymmetry is found in the $K^{+}K^{-}$ low-invariant-mass region.Comment: 7 pages, 3 figure

Search for D0D^{0} decays to invisible final states at Belle

We report the result from the first search for $D^0$ decays to invisible final states. The analysis is performed on a data sample of 924 $\rm{fb}^{-1}$ collected at and near the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The absolute branching fraction is determined using an inclusive $D^0$ sample, obtained by fully reconstructing the rest of the particle system including the other charmed particle. No significant signal yield is observed and an upper limit of $9.4\times 10^{-5}$ is set on the branching fraction of $D^0$ to invisible final states at 90\% confidence level.Comment: 17 pages, 4 figures, submitted to PRD(RC

Angular analysis of B0→K∗(892)0ℓ+ℓ−B^0 \to K^\ast(892)^0 \ell^+ \ell^-

We present a measurement of angular observables, $P_4'$, $P_5'$, $P_6'$, $P_8'$, in the decay $B^0 \to K^\ast(892)^0 \ell^+ \ell^-$, where $\ell^+\ell^-$ is either $e^+e^-$ or $\mu^+\mu^-$. The analysis is performed on a data sample corresponding to an integrated luminosity of $711~\mathrm{fb}^{-1}$ containing $772\times 10^{6}$ $B\bar B$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the asymmetric-energy $e^+e^-$ collider KEKB. Four angular observables, $P_{4,5,6,8}'$ are extracted in five bins of the invariant mass squared of the lepton system, $q^2$. We compare our results for $P_{4,5,6,8}'$ with Standard Model predictions including the $q^2$ region in which the LHCb collaboration reported the so-called $P_5'$ anomaly.Comment: Conference paper for LHC Ski 2016. SM prediction for $P_{6}'$ corrected and reference for arXiv:1207.2753 adde