High cycle fatigue of ARMCO iron severely deformed by ECAP

The high-cycle fatigue behavior of ARMCO iron severely deformed by Equal Channel Angular Pressing (ECAP) at room temperature through route Bc until 8 passes, with an average grain size of ~365 nm, was studied and compared with the same material in the annealed state with an average grain size of ~72 µm. The fatigue limit of the 8 passes ECAPed sample increased with respect to the annealed material by more than 250% rising from 274 MPa to 717 MPa. Striations and dimpled relief were observed on the fracture surfaces of the fatigued ultrafine and coarse grain fatigue samples. The microstructure was characterized by Electron Backscattered Diffraction (EBSD) before and after the fatigue tests and it was observed in both samples an increment in the fraction of Low Angle Grain Boundaries (LAGB) at high number of cycles to failure. A texture analysis for the materials after the fatigue failure was done. This study shown a preferential orientation towards the ¿ fiber for both conditions.Peer ReviewedPostprint (author's final draft

Detecting Hands in Egocentric Videos: Towards Action Recognition

Recently, there has been a growing interest in analyzing human daily activities from data collected by wearable cameras. Since the hands are involved in a vast set of daily tasks, detecting hands in egocentric images is an important step towards the recognition of a variety of egocentric actions. However, besides extreme illumination changes in egocentric images, hand detection is not a trivial task because of the intrinsic large variability of hand appearance. We propose a hand detector that exploits skin modeling for fast hand proposal generation and Convolutional Neural Networks for hand recognition. We tested our method on UNIGE-HANDS dataset and we showed that the proposed approach achieves competitive hand detection results

Los pliegues cutáneos como predictores del porcentaje graso en futbolistas profesionales

El objetivo del presente estudio fue determinar los pliegues cutáneos que mejor predicen el porcentaje de grasa de futbolistas profesionales Peruanos a partir de tres ecuaciones. Para lo cual, se estudiaron 136 futbolistas profesionales evaluándose el peso corporal (kg), la estatura (m) y los pliegues cutáneos (mm) tricipital, subescapular, suprailiaco, abdominal, muslo y pantorrilla. Los resultados fueron analizados a través de la estadística descriptiva de la media aritmética (X) y desviación estándar (DE) y la estadística inferencial de regresión múltiple StepWise (p<0,001). Los resultados señalan que el % de grasa corporal hallado por las tres ecuaciones sugieren que los pliegues cutáneos tricipital, subescapular, suprailiaco y abdominal, explican mejor el % de grasa en relación a los pliegues del muslo y la pantorrilla media.The aim of this study was to determine the best predictors skinfold fat percentage Peruvian professional footballers from three equations. To this end, we studied 136 professional football players evaluated body weight (kg), height (m) and skinfold (mm) triceps, subscapular, suprailiac, abdominal, thigh and calf. The results were analyzed through descriptive statistics of the arithmetic mean (X) and standard deviation (SD) and inferential statistics multiple stepwise regression (p <0.001). The results indicate that the% body fat found by the three equations suggest that the triceps skinfold, subscapular, suprailiac and abdominal best explain the% fat in relation to the folds of the thigh and calf average.Peer Reviewe

Assessment of the importance of the current-wave coupling in the shelf ocean forecasts

International audienceThe effects of wave-current interactions on shelf ocean forecasts is investigated in the framework of the MFSTEP (Mediterranean Forecasting System Project Towards Enviromental Predictions) project. A one way sequential coupling approach is adopted to link the wave model (WAM) to the circulation model (SYMPHONIE). The coupling of waves and currents has been done considering four main processes: wave refraction due to currents, surface wind drag and bottom drag modifications due to waves, and the wave induced mass flux. The coupled modelling system is implemented in the southern Catalan shelf (NW Mediterranean), a region with characteristics similar to most of the Mediterranean shelves. The sensitivity experiments are run in a typical operational configuration. The wave refraction by currents seems to be not very relevant in a microtidal context such as the western Mediterranean. The main effect of waves on current forecasts is through the modification of the wind drag. The Stokes drift also plays a significant role due to its spatial and temporal characteristics. Finally, the enhanced bottom friction is just noticeable in the inner shelf

Neutrino charge radius and electromagnetic dipole moments via scalar and vector leptoquarks

The one-loop contribution of scalar and vector leptoquarks (LQs) to the electromagnetic properties (NEPs) of massive Dirac neutrinos is presented via an effective Lagrangian approach, with emphasis on the effective neutrino charge radius (NCR), which has never been calculated and is obtained by the background field formalism in a Yang-Mills-like scenario for gauge LQs. Analytical results for nonzero neutrino mass are presented in terms of both Feynman-parameter integrals and Passarino-Veltman scalar functions, which can be useful to obtain the NEPs of heavy neutrinos, out of which approximate expressions are obtained for light neutrinos. For the numerical analysis we concentrate on the only renormalizable scalar and vector LQ representations that do not need extra symmetries to forbid tree-level proton decay. Constraints on the parameter space consistent with current experimental data are then discussed and it is found that the LQ representations $\widetilde{R}_2$ and $U_1$ could yield the largest contributions to the NEPs provided that they have couplings to both left- and right-handed neutrinos of the order of $O(1)$. For a LQ mass of $1.5$ TeV, the magnetic dipole moment (MDM) of the tau neutrino can be of the order of $10^{-9}$ $\mu_B$, whereas its neutrino electric dipole moment (EDM) can reach values as high as $10^{-20}$-$10^{-19}$ ecm. On the other hand, the NCR can reach values up to $10^{-35}$ cm$^2$ regardless of the neutrino flavor and even in the absence of right-handed neutrinos. In the latter scenario, the EDM vanishes and the contribution to neutrino MDM would be negligible, of the order of $10^{-14}$ $\mu_B$ for the tau neutrino, whereas those for the muon and electron neutrinos would be about two and seven orders of magnitude smaller, respectively. Our estimates could be severely suppressed due to a possible suppression of the LQ coupling constants.Comment: 31 pages, 11 figure

Correlation between explosive strength and speed in young players

El objetivo del presente estudio fue determinar las relaciones entre la fuerza explosiva y la velocidad V(20m) en futbolistas cadetes y juveniles. Para el estudio fueron evaluados 18 jugadores de la categoría infantil y 18 de la categoría juvenil, siendo un total de 36 futbolistas. Se evaluó el peso corporal (kg), estatura (cm) y el % de grasa corporal. Así como también los test de squat Jump SJ(cm), CounterMovement Jump CMJ(cm) y saltos verticales contínuos en 5 segundos CJ5s(cm). Los resultados muestran altas correlaciones entre SJ y CMJ (0,80), SJ y V(20m) ( 0,71) y CMJ y V(20m) (-0,61) en cadetes, así como en juveniles SJ y CMJ (0,89) y SJ y V(20m) (-0,62), respectivamente. Por lo tanto, se concluye que la fuerza explosiva se encuentra en estrecha relación con la velocidad (20m), tanto en jugadores de la categoría cadetes y juvenil.The aim of this study was to determine the relationship between the explosive power and speed V(20m) in children and youth players. For the study were evaluated 18 players in the cadet’s category and 18 in the youth category, for a total of 36 players. We assessed body weight (kg), height (cm) and% body fat, as well as the squat jump test, SJ (cm), countermovement jump CMJ (cm) and continuous vertical jumps in 5 seconds CJ5s (cm). The results show high correlations between SJ and CMJ (0.80), SJ and V(20m) ( 0.71) and CMJ and V (20m) (-0.61) in cadet’s and youth in SJ and CMJ (0.89) and SJ and V(20m) (-0.62), respectively. Therefore, we conclude that the explosive force is closely related to the speed (20m), both players of the cadets and youth category.Peer Reviewe

Effects of supplementation of L-carnitine on the body composition of trained and sedentary rats

El objetivo del presente estudio es determinar el efecto de la suplementación de L-carnitina sobre la composición corporal de ratas entrenadas y sedentarias. Fueron seleccionadas de forma aleatoria 30 ratas machos Wistar, de 12 semanas de vida, cuyo peso osciló entre 350 a 380 gramos, constituyéndose cuatro grupos de animales: sedentario no suplementado (SNS), sedentario suplementado (SS), entrenado no suplementado (ENS) y entrenado suplementado (ES). El entrenamiento fue realizado con sesiones de carrera en la estera rodante, con duración de una hora y con suplementación oral crónica de L-Carnitina. Ambos protocolos con una duración de 4 semanas. La composición corporal fue evaluada a través de ecuaciones de predicción para determinar la masa libre de grasa (MLG) y masa de grasa (MG). Los resultados muestran que el entrenamiento físico disminuye los valores de la MLG y MG en el grupo ENS, y que la administración de la L-carnitina en forma conjunta con el entrenamiento físico revierte parcialmente la reducción de la MLG en el grupo ES. Finalmente se concluye que el ejercicio físico debe ser realizado juntamente con la suplementación de L-carnitina, permitiendo una disminución de la MG y mantener los niveles de MLG en ratas en proceso de crecimiento.The aim of this study is to determine the effect of L-carnitine supplementation on body composition of trained and sedentary rats. Were randomly selected 30 male Wistar rats of 12 weeks of age, whose weight ranged between 350 to 380 grams, four groups of animals: sedentary non-supplemented (SNS), sedentary supplemented (SS), trained not supplemented (ENS) trained and supplemented (ES). The training was done with sessions running on a treadmill, lasting an hour and chronic oral supplementation of L-carnitine. Both protocols with a duration of 4 weeks. Body composition was assessed by prediction equations to determine fat-free (FFM) and fat mass (FM). The results show that physical training decreases the values of FFM and FM in the ENS group, and that the administration of L-carnitine together with physical training partially reverses the reduction of MLG in ES. Finally concluded that physical exercise should be conducted jointly with the supplementation of L-carnitine, allowing a reduction in the MG and maintain levels in rats MLG growth process.Peer Reviewe

Design and Synthesis of CNS-targeted Flavones and Analogues with Neuroprotective Potential Against H2O2- and Aβ1-42-Induced Toxicity in SH-SY5Y Human Neuroblastoma Cells

With the lack of available drugs able to prevent the progression of Alzheimer’s disease (AD), the discovery of new neuroprotective treatments able to rescue neurons from cell injury is presently a matter of extreme importance and urgency. Here, we were inspired by the widely reported potential of natural flavonoids to build a library of novel flavones, chromen-4-ones and their C-glucosyl derivatives, and to explore their ability as neuroprotective agents with suitable pharmacokinetic profiles. All compounds were firstly evaluated in a parallel artificial membrane permeability assay (PAMPA) to assess their effective permeability across biological membranes, namely the blood-brain barrier (BBB). With this test, we aimed not only at assessing if our candidates would be well-distributed, but also at rationalizing the influence of the sugar moiety on the physicochemical properties. To complement our analysis, logD7.4 was determined. From all screened compounds, the p-morpholinyl flavones stood out for their ability to fully rescue SH-SY5Y human neuroblastoma cells against both H2O2- and Aβ1-42-induced cell death. Cholinesterase inhibition was also evaluated, and modest inhibitory activities were found. This work highlights the potential of C-glucosylflavones as neuroprotective agents, and presents the p-morpholinyl C-glucosylflavone 37, which did not show any cytotoxicity towards HepG2 and Caco-2 cells at 100 μM, as a new lead structure for further development against AD.Fundação para a Ciência e a Tecnologia-UID/Multi/0612/2019Unión Europea-D3i4AD), FP7-PEOPLE-2013-IAPP, GA 61234