923 research outputs found

    A new functional for improving cell area distribution

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    In this work we present a new area functional that help us improve the cell area distribution in structured grids over plane irregular regions, which avoids very small and very large cell areas as much as possible. We present some results and an implementation of this functional in a preliminary version of the latest UNAMalla system

    BIOPSIA ENDOMETRIAL AMBULATORIA: EXPERIENCIA PRELIMINAR

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    Objetivo: Presentar la experiencia inicial en el diagnóstico histológico con biopsia endometrial ambulatoria obtenida con pipelle de Cornier. Material y método: Se efectuó biopsia endometrial ambulatoria con pipelle de Cornier en 144 pacientes con sospecha clínica y/o ecográfica de patología endometrial difusa. Resultados: Se logró realizar el procedimiento a 131 pacientes (91%), obteniéndose diagnóstico histológico satisfactorio en 110 casos (76,4%). De las 110 muestras analizadas, se diagnosticó cáncer de endometrio en 3 pacientes (2,7%) e hiperplasia con atipias en 1 paciente (0,9%). Conclusiones: La biopsia endometrial ambulatoria es un procedimiento sensible, específico, eficiente, seguro y económico, que permite aumentar la cobertura del diagnóstico precoz del cáncer de endometri

    Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

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    The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum
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