Stern-Gerlach Entanglement in Spinor Bose-Einstein Condensates

Entanglement of spin and position variables produced by spatially inhomogeneous magnetic fields of Stern-Gerlach type acting on spinor Bose-Einstein condensates may lead to interference effects at the level of one-boson densities. A model is worked out for these effects which is amenable to analytical calculation for gaussian shaped condensates. The resulting interference effects are sensitive to the spin polarization properties of the condensate.Comment: 9 pages, 2 figure

Structural effects of steel reinforcement corrosion on statically indeterminate reinforced concrete members

The final publication is available at Springer via http://dx.doi.org/10.1617/s11527-016-0836-2Steel corrosion in reinforced concrete structures produces loss of reinforcement area and damage in the surrounding concrete. As a consequence, increases in deflections, crack widths and stresses may take place, as well as a reduction of the bearing capacity, which depends on the structural scheme and redundancy. In this paper an experimental study of twelve statically indeterminate beams subjected to different levels of forced reinforcement corrosion is presented. Different sustained loads were applied during the corrosion phase to assess their influence on the effects of corrosion. An important increase in deflections was registered in all corroded beams, especially in those subject to higher load levels. It was also found that the rate of corrosion was affected by the load level. Internal forces redistributions due to induced damage were measured. Finally, the experimental results were compared with those predicted by a non-linear time-dependent segmental analysis model developed by the authors, obtaining in general good agreement.Peer ReviewedPostprint (author's final draft

Investigacion y/o innovación. Un proyecto en y para el centro educativo

Algunos de los cambios acaecidos en el campo de la epistemología de la investigación, nos obliga a revisar con un sentido más crítico mucho de lo que normalmente se investiga en la educación. La existencia de tener presente estos cambios nace de la comprobación de nuevos paradigmas en la educación; de los que la investigación tiene que ser más seriamente consciente.Una de las variables que puede incidir de forma más o menos directa es el grado de autonomía y desarrollo profesional de los profesores investigadores. Una investigación centrada en el puesto de trabajo ( Centro docente), centrada en un Proyecto, centrada en la práctica, centrada en los problemas prácticos de su clase y realizada en un concepto específico, como miembro de un colectivo (Departamento o Claustro) y que una vez planteadas las necesidades específicas de la investigación, para que el profesorado participe en el diseño, en la realización y en la evaluación de la misma.Con este documento pretendemos exponer los momentos, las finalidades y las orientaciones llevadas a cabo en un proyecto de trabajo desde la investigación-acción

A critical fractional equation with concave-convex power nonlinearities

none4sìIn this work we study a fractional critical problem with concave-convex nonlinearities. Our main results show the existence and multiplicity of solutions to this problem for different values of the real parameter appearing in the equation. The dependency on this parameter changes according to whether we consider the concave power case or the convex power case. These two cases will be treated separatelyopenBarrios B; Colorado E; Servadei R; Soria FBarrios, B; Colorado, E; Servadei, Raffaella; Soria, F

The fiscal and equity impact of tax expenditures in the European Union

Tax expenditures are preferential tax treatments granted to specific individuals or categories of households which aim at achieving social and economic goals \u2013 poverty and inequality reduction, and employment promotion, among others. Tax expenditures are widely used by EU Member States. However, their fiscal and equity impacts are not always clear and their effectiveness and efficiency as a policy instrument needs to be carefully evaluated, especially in the present context of constrained public finances. Tax expenditures might in some cases distort economic incentives be it towards consumption or investment, in some case by favouring rent seeking behaviour and making tax systems less transparent and/or regressive from a social viewpoint. While policy recommendations often call for streamlining tax expenditures, in practice policy measures are often difficult to design in particular given the difficulty in measuring the fiscal and equity impact of tax expenditures. This paper quantifies the fiscal and equity effects of tax expenditures in 27 European countries making use of EUROMOD, the EU-wide microsimulation model. We focus on four specific categories of preferential tax treatments affecting personal income taxation related to housing, pension, education and health expenditures. One key feature of the microsimulation model EUROMOD is that it embeds the interaction between different tax instruments and benefits entitlement which, in EU tax systems, proves essentially to fully gauge the fiscal and equity impact of tax expenditures. In order to quantify the impact of tax expenditure on governments' tax revenues and on households' disposable income a benchmark tax system scenario is created where tax expenditures \u2013 in the form of allowances, deductions, exemptions, reliefs and credits \u2013 are explicitly considered. We find a variety of effects, in terms of sign and magnitude, across Member States, and within these, among types of households and across generations. Overall our findings suggest that the impact of tax expenditure on tax revenues and on income inequalities can be sizeable. The redistributive impact of removing tax expenditures can go both directions, either on the progressive or regressive side, depending on the country and the tax expenditure considered. This result points out to the importance of a careful country specific scrutiny, for each type of tax expenditures

Reflexiones sobre el aprendizaje de la guitarra en la Educación Musical española. Propuesta de actuación

Esta comunicación trata de la problemática que se plantea ante la diversidad de roles de los alumnos de guitarra según los distintos centros y niveles, como pueden ser: el alumno-guitarrista de acompañamiento, el guitarrista por cifra o exagrama, el guitarrista de conservatorio, el guitarrista de flamenco y el alumno guitarrista de nuevas músicas (Jazz, Blues, Rock, etc.)Tras este primer análisis plantea distintas propuestas de actuación para la enseñanza-aprendizaje de la guitarra en la formación musical del individuo en los distintos niveles educativos, basándonos en los siguientes puntos:- Es un instrumento polifónico ideal para el acompañamiento de la voz, así como de otros instrumentos melódicos (flauta dulce, melódica, armónica…)- El comienzo de ese aprendizaje se puede dar a la temprana edad de cuatro o cinco años- Fomenta la participación de la música mediante la creación de agrupaciones como las rondallas, tunas, etc…Planteamiento para abordar la problemática de la diversidad- Acercar al alumno profesional a la música popular- Dar un carácter más científico al aprendizaje de la guitarra de acompañamiento- Unificar en cierta forma todos los perfiles mencionado

Arthrodiastasis for stiff hips in young patients

Joint distraction (arthrodiastasis) with a unilateral fixator was used to treat 9 patients with stiffness of the hip which had followed Perthes' disease (3), epiphysiolysis (2), congenital dysplasia (2), tuberculosis (1) and idiopathic chondrolysis (1). Their average age was 14 years, and they all had pain, limp and shortening of the leg. Distraction of 0.5 to 1 cm was maintained for an average of 94 days. The average range of movement subsequently was 65 degrees compared with 20 degrees before. The articular space was widened by an average of 2.8 mm, and only 3 patients had pain on follow up