Universal angular magnetoresistance and spin torque in ferromagnetic/normal metal hybrids

The electrical resistance of ferromagnetic/normal-metal (F/N) heterostructures depends on the nature of the junctions which may be tunnel barriers, point contacts, or intermetallic interfaces. For all junction types, the resistance of disordered F/N/F perpendicular spin valves as a function of the angle between magnetization vectors is shown to obey a simple universal law. The spin-current induced magnetization torque can be measured by the angular magnetoresistance of these spin valves. The results are generalized to arbitrary magnetoelectronic circuits

Effect of morphology on the large-amplitude flapping dynamics of an inverted flag in a uniform flow

The stability of a cantilevered elastic sheet in a uniform flow has been studied extensively due to its importance in engineering and its prevalence in natural structures. Varying the flow speed can give rise to a range of dynamics including limit cycle behaviour and chaotic motion of the cantilevered sheet. Recently, the "inverted flag" configuration - a cantilevered elastic sheet aligned with the flow impinging on its free edge - has been observed to produce large-amplitude flapping over a finite band of flow speeds. This flapping phenomenon has been found to be a vortex-induced vibration, and only occurs at sufficiently large Reynolds numbers. In all cases studied, the inverted flag has been formed from a cantilevered sheet of rectangular morphology, i.e. the planform of its elastic sheet is a rectangle. Here, we investigate the effect of the inverted flag's morphology on its resulting stability and dynamics. We choose a trapezoidal planform which is explored using experiment and an analytical theory for the divergence instability of an inverted flag of arbitrary morphology. Strikingly, for this planform we observe that the flow speed range over which flapping occurs scales approximately with the flow speed at which the divergence instability occurs. This provides a means by which to predict and control flapping. In a biological setting, leaves in a wind can also align themselves in an inverted flag configuration. Motivated by this natural occurrence we also study the effect of adding an artificial "petiole" (a thin elastic stalk that connects the sheet to the clamp) on the inverted flag's dynamics. We find that the petiole serves to partially decouple fluid forces from elastic forces and increases the freedom by which the flapping dynamics can be tuned. These results highlight the intricacies of the flapping instability and account for some of the varied dynamics of leaves in nature.Comment: 21 pages, 10 figures, 1 tabl

Optimising resourcing skills to develop phraseological competence in legal translation: tasks and approaches

Based on a previous case study on common translation errors made by trainee translators when dealing with phraseological units in legal translation (Huertas Barros and Buendía 2017), this paper proposes some activities and approaches to minimise these errors and hence enhance students’ phraseological competence in this field. To this end, we first provide a description of the most representative legal resources available for translators, particularly for the English-Spanish language pair. Then we review some of the existing approaches that could develop students’ legal translation competence, particularly phraseological competence. For each type of error identified in our previous case study, we propose a set of research-based activities which could avoid such errors by maximising the use of legal resources. The emphasis is put on preliminary documentary research and effective use of corpora prior to the translation task. In order to mitigate translation errors, we propose an integrated approach combining task-based approaches with approaches based on critical discourse analysis, and problem-solving and decision-making. While these tasks have been designed for a semi-specialised legal text pertaining to a subdomain of Family Law (i.e. adoption), they can be easily applied to any other areas of subdomains of legal translation

New isometry of Krall-Laguerre orthogonal polynomials in martingale spaces

In this paper we study how an inner product derived from an Uvarov transformation of the Laguerre weight function is used in the orthogonalization procedure of a sequence of martingales related to a Levy process. The orthogonalization is done by isometry. The resulting set of pairwise strongly orthogonal martingales involved are used as integrators in the so-called chaotic representation propertyEdmundo J. Huertas is supported by a grant from Ministerio de Ciencia e Innovación (MTM 2009-12740-C03-01), and by Fundação para a Ciência e Tecnologia (FCT), ref. SFRH/BPD/91841/2012, Portugal. Nuria Torrado is supported by Fundação para a Ciência e Tecnologia (FCT), ref. SFRH/BPD/91832/2012, Portugal. The research of Fabrizio Leisen has been partially supported by the Spanish Ministry of Science and Innovation through grant ECO2011-2570

Las bentonitas de la zona sur de Cabo de Gata (Almería). Geoquímica y Mineralogía

Se han estudiado las caracteristicas quimicas y mineralógicas de las bentonitas y esmectitas de esta region, asi como sus principales parametros cristalográficos y fórmulas estructurales de las esmectita

Proximity effect-assisted absorption of spin currents in superconductors

The injection of pure spin current into superconductors by the dynamics of a ferromagnetic contact is studied theoretically. Taking into account suppression of the order parameter at the interfaces (inverse proximity effect) and the energy-dependence of spin-flip scattering, we determine the temperature-dependent ferromagnetic resonance linewidth broadening. Our results agree with recent experiments in Nb|permalloy bilayers [C. Bell et al., arXiv:cond-mat/0702461].Comment: 4 page