Comment on "Theory of tailoring sonic devices: Diffraction dominates over refraction"

Recently N. Garcia et al. (Phys. Rev. E 67, 046606 (2003)) theoretically studied several acoustic devices with dimensions on de order of several wavelenghts. The authors discussed on experimental results previously reported by several of us (F. Cervera et al., Phys. Rev. Lett. 88, 023902 (2002)). They concluded that diffraction and not refraction is the ominating mechanism that explain the focusing effects observed in those experiments. In this Comment we reexamined their calculations and discussed why some of their interpretations of our results are misleading.Comment: 2 pages, 2 figures, a comment on an articl

Numerical modeling of the electron beam welding and its experimental validation

Electron Beam Welding (EBW) is a highly efficient and precise welding method increasingly used within the manufacturing chain and of growing importance in different industrial environments such as the aeronautical and aerospace sectors. This is because, compared to other welding processes, EBW induces lower distortions and residual stresses due to the lower and more focused heat input along the welding line. This work describes the formulation adopted for the numerical simulation of the EBW process as well as the experimental work carried out to calibrate and validate it. The numerical simulation of EBW involves the interaction of thermal, mechanical and metallurgical phenomena. For this reason, in this work the numerical framework couples the heat transfer process to the stress analysis to maximize accuracy. An in-house multi-physics FE software is used to deal with the numerical simulation. The definition of an ad hoc moving heat source is proposed to simulate the EB power surface distribution and the corresponding absorption within the work-piece thickness. Both heat conduction and heat radiation models are considered to dissipate the heat through the boundaries of the component. The material behavior is characterized by an apropos thermo-elasto-viscoplastic constitutive model. Titanium-alloy Ti6A14V is the target material of this work. From the experimental side, the EB welding machine, the vacuum chamber characteristics and the corresponding operative setting are detailed. Finally, the available facilities to record the temperature evolution at different thermo-couple locations as well as to measure both distortions and residual stresses are described. Numerical results are compared with the experimental evidence.Peer ReviewedPostprint (author's final draft

Procedimiento para la purificación de Triglicéridos que contienen ácido Gamma-Linolenico en posición SN-2

Número de publicación: ES2345529 A1 (24.09.2010) También publicado como: ES2345529 B2 (21.07.2011) Número de Solicitud: Consulta de Expedientes OEPM (C.E.O.) P200900892(13.03.2009)Procedimiento para la purificación de triglicéridos que contienen ácido gamma-linolénico en posición sn-2. Con la finalidad de purificar triglicéridos que contienen ácido gamma-linolénico a partir de fuentes naturales, se utiliza una columna cromatográfica gravimétrica en fase normal, trabajando en gradiente de polaridad con solventes biocompatibles. Así se consigue la purificación de triglicéridos que cuentan en su estructura con una o más moléculas de ácido gamma-linolénico, pudiendo ser utilizados con diversos fines. Con esta metodología es posible trabajar a escala industrial, pues es fácilmente escalable, a diferencia de otras técnicas que son aplicables a escala analítica pero presentan serios inconvenientes en cuanto a coste y adiestramiento del personal a la hora de utilizarlas con fines industriales, como por ejemplo la cromatografía líquida de alta resolución (HPLC).Universidad de Almerí

Toward CP-even Neutrino Beam

The best method of measuring CP violating effect in neutrino oscillation experiments is to construct and use a neutrino beam made of an ideal mixture of $\bar{\nu}_e$ and $\nu_e$ of monochromatic lines. The conceptual design of such a beam is described, together with how to measure the CP-odd quantity. We propose to exploit an accelerated unstable hydrogen-like heavy ion in a storage ring, whose decay has both electron capture and bound beta decay with a comparable fraction.Comment: 6 pages, 2 figures, Published versio

Procedimiento para la purificación de Triglicéridos que contienen ácido Estearidónico en posición SN-2

Número de publicación: ES2363518 A1 (08.08.2011)También publicado como: ES2363518 A8 (10.04.2012), ES2363518 B1 (13.06.2012)Número de Solicitud: Consulta de Expedientes OEPM (C.E.O.) P201000070(23.01.2010)Procedimiento para la purificación de triglicéridos que contiene ácido estearidónico en posición sn-2. La invención se refiere a un procedimiento para la purificación de TGs ricos en SDA en posición sn-2 mediante cromatografía en columna gravimétrica, a un extracto de TGs ricos en SDA en posición sn-2 obtenido mediante dicho procedimiento y su uso en la industria.Univerisda de Almerí

Amorphous CNx layers from neon electron cyclotron resonance plasmas with N2 and CH4 as precursors

© The Electrochemical Society, Inc. 2000. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of The Electrochemical Society. Barbadillo, L., Hernández, M. J., Cervera, M. and J. Piqueras. Amorphous CNx layers from neon electron cyclotron resonance plasmas with N2 and CH4 as precursors. Journal of The Electrochemical Society 147.10 (2000): 3864-386

El coordinador tic en los centros educativos: funciones para la dinamización e incorporación didáctica de las tic en las actividades de aprendizaje

La presente investigación analiza la figura del coordinador en Tecnologías de la Información y Comunicación en los centros educativos. Particularmente en las escuelas públicas de infantil y primaria de la comarca del Baix Ebre (Tarragona). Tras realizar el estudio de los datos, se aportan unas sugerencias sobre las características que debería tener un/a CTIC, y un conjunto de orientaciones que pueden servir de base para concretar cuáles son las funciones que debería asumir para poder realizar una mejor función de orientación e impulso, en su proceso de dinamización, con el fin de alcanzar la inclusión de lasmTIC.This research analyzes the coordinator of the Information and Communication Technologies in public primary schools in the region of Baix Ebre, (Tarragona).The implementation level of the Information Technology and Communication (ICT) in schools has been analyzed. In conclusion, after the data analysis, this research provides a set of guidelines that can be useful as a basis to specify what functions it should be assumed by the ICT coordinator in order to improve the revitalization process of the Learning Technologies and Knowledge (TAC) in their schools, and to help the school team to include the ICT Keywords: information and Communication Technologies (ICT), Coordinator ICT, educational centers, Teacher Resource Centers, innovation