K→πK \to \pi semileptonic form factors with Nf=2+1+1N_f=2+1+1 Twisted Mass fermions

We present a lattice QCD determination of the vector and scalar form factors of the semileptonic $K \to \pi \ell \nu$ decay which are relevant for the extraction of the CKM matrix element $|V_{us}|$ from experimental data. Our results are based on the gauge configurations produced by the European Twisted Mass Collaboration with $N_f = 2+1+1$ dynamical fermions, which include in the sea, besides two light mass degenerate quarks, also the strange and the charm quarks. We use data simulated at three different values of the lattice spacing and with pion masses as small as $210$ MeV. Our final result for the vector form factor at zero momentum transfer is $f_+(0) = 0.9709 (46)$, where the uncertainty is both statistical and systematic combined in quadrature. Using the latest experimental value of $f_+(0) |V_{us}|$ from $K_{\ell 3}$ decays, we obtain $|V_{us}| = 0.2230 (11)$, which allows to test the unitarity constraint of the Standard Model below the permille level once the determination of $|V_{ud}|$ from superallowed nuclear $\beta$ decays is adopted. A slight tension with unitarity at the level of $\sim 2$ standard deviations is observed. Moreover we present our results for the semileptonic scalar $f_0(q^2)$ and vector $f_+(q^2)$ form factors in the whole range of values of the squared four-momentum transfer $q^2$ measured in $K_{\ell 3}$ decays, obtaining a very good agreement with the momentum dependence of the experimental data. We provide a set of synthetic data points representing our results for the vector and scalar form factors at the physical point for several selected values of $q^2$.Comment: 37 pages, 5 tables, 9 figures; version to appear in PR

Mixed-mode impedance and reflection coefficient of two-port devices

From the point of view of mixed-mode scattering parameters, Smm, a two-port device can be excited using different driving conditions. Each condition leads to a particular set of input reflection and input impedance coefficient definitions that should be carefully applied depending on the type of excitation and symmetry of the two-port device. Therefore, the aim of this paper is to explain the general analytic procedure for the evaluation of such reflection and impedance coefficients in terms of mixed-mode scattering parameters. Moreover, the driving of a two-port device as a one-port device is explained as a particular case of a two-port mixed-mode excitation using a given set of mixed-mode loads. The theory is applied to the evaluation of the quality factor, Q, of symmetrical and non- symmetrical inductors.Ministerio de Innovación y Ciencia TEC2010-14825/MIC, TEC2010-21484Junta de Andalucía TIC-253

Monoartritis gotosa de muñeca asociada a necrosis del semilunar: a propósito de un caso clínico

Se presenta un caso de monoartritis de muñeca asociada a imágenes radiológicas de necrosis avascular del semilunar que, tras biopsia de la sinovial, se diagnostica de artritis gotosa. Esta asociación es rara. La alteración metabólica que se produce en la gota da lugar a una sinovitis, que provoca un aumento de presión intraarticular. Esta hiperpresión en el carpo podría determinar una necrosis isquémica del semilunar, pero con una evolución diferente a la enfermedad de Kienböck. Es por ello que una artropatía metabólica, debe considerarse como diagnóstico diferencial con la enfermedad de Kiemböck cuando se asocian imágenes geódicas en el carpo y radio.We report a case of monoarthritis of the wrist associated with radiological signs of avascular necrosis of lunate. The synovial biopsy confirmed the diagnosis of gout. This is a very rare association. Differential diagnosis should be make with a metabolic arthritis when bone necrosis is associated with osseous lesions in carpal bones and radius

\Delta S=2 and \Delta C=2 bag parameters in the SM and beyond from Nf=2+1+1 twisted-mass LQCD

We present unquenched lattice QCD results for the matrix elements of four-fermion operators relevant to the description of the neutral K and D mixing in the Standard Model and its extensions. We have employed simulations with Nf = 2 + 1 + 1 dynamical sea quarks at three values of the lattice spacings in the interval 0.06 - 0.09 fm and pseudoscalar meson masses in the range 210 - 450 MeV. Our results are extrapolated to the continuum limit and to the physical pion mass. Renormalization constants have been determined non-perturbatively in the RI-MOM scheme. In particular, for the Kaon bag-parameter, which is relevant for the \overline{K}^0-K^0 mixing in the Standard Model, we obtain B_K^{RGI} = 0.717(24).Comment: Added comments to error budget discussion; fig.19 corrected. Version to appear in PR

V-Shape Liquid Crystal-Based Retromodulator Air to Ground Optical Communications

This paper describes the use of a 2D liquid crystal retro-modulator as a free space, wireless, optical link. The retro-modulator is made up of a retro-reflecting cornercube onto which 2 cascaded V-shape smectics liquid crystal modulators are mounted. The communication link differs with respect to more conventional optical links in not using amplitude (nor frequency) modulation, but instead state-of-polarisation (SOP) modulation known as Polarisation Shift Keying (PolSK). PolSK has the advantage over amplitude modulation, that it is less sensitive to changes in the visibility of the atmosphere, and increases inherently the bandwidth of the link. The implementation of PolSK both in liquid crystal based and in retro-modulated communication are novelties

A case report: Giant early gastric cancer

Indexación: Scopus; Scielo.Introducción: El cáncer gástrico es la primera causa de muerte por cáncer, en hombres, en Chile, siendo el adenocarcinoma la variante más frecuente. Caso clínico: Reportamos el caso de un cáncer gástrico incipiente gigante de 7,2 cm en un hombre de 74 años tratado en la Clínica INDISA en Santiago de Chile. El paciente fue sometido exitosamente a una gastrectomía total con linfoadenectomía D2 y esófago-yeyuno anastomosis en Y de Roux. La histología evidenció un adenocarcinoma bien diferenciado, polipoide, invasivo hasta la submucosa, sin compromiso ganglionar. A los 5 años de su cirugía, el paciente se encuentra asintomático y sin recidiva tumoral.https://www.sciencedirect.com/science/article/pii/S0379389316301600?via%3Dihu