Optimal light harvesting structures at optical and infrared frequencies

One-dimensional light harvesting structures with a realistic geometry nano-patterned on an opaque metallic film are optimized to render high transmission efficiencies at optical and infrared frequencies. Simple design rules are developed for the particular case of a slit-groove array with a given number of grooves that are symmetrically distributed with respect to a central slit. These rules take advantage of the hybridization of Fabry-Perot modes in the slit and surface modes of the corrugated metal surface. Same design rules apply for optical and infrared frequencies. The parameter space of the groove array is also examined with a conjugate gradient optimization algorithm that used as a seed the geometries optimized following physical intuition. Both uniform and nonuniform groove arrays are considered. The largest transmission enhancement, with respect to a uniform array, is obtained for a chirped groove profile. Such enhancement is a function of the wavelength. It decreases from 39% in the optical part of the spectrum to 15% at the long wavelength infrared.Comment: 13 pages, 5 figure

A review on coisotropic reduction in Symplectic, Cosymplectic, Contact and Co-contact Hamiltonian systems

In this paper we study the coisotropic reduction in different types of dynamics according to the geometry of the corresponding phase space. The relevance of the coisotropic reduction is motivated by the fact that these dynamics can always be interpreted as Lagrangian or Legendrian submanifolds

The systematization of evaluation in a learning process based on shared work strategies

Inmersos en la demanda emanada por la incorporación de la universidad española en el proceso de convergencia europea, donde los procesos de formación se centran en el desarrollo de competencias académicas y profesionales y donde es preciso el diseño de propuestas evaluadoras de carácter innovador y comunitario, dos docentes nos propusimos, hace ya cuatro cursos académicos, relegar la formación en contenidos teóricos a favor de la aproximación a la realidad de la labor profesional de los futuros y futuras psicopedagogas. Estos párrafos relatan de un modo sistemático las diferentes herramientas de evaluación diseñadas y empleadas en una acción formativa conjunta dirigida al alumnado de la titulación de Psicopedagogía de la Universidad de Córdoba: instrumentos para el diseño y optimización de la propuesta formativa, instrumentos para la evaluación de las competencias académicas y profesionales, instrumentos para regular el trabajo en equipo e instrumentos para evaluar la propuesta de trabajo compartid

Buenas prácticas de innovación docente en la Universidad de Córdoba

La propuesta, que empezó a gestarse hace cuatro cursos académicos, se denomina Investigación en atención a la diversidad (Invadid), que supone el establecimiento de relaciones significativas entre los conocimientos conceptuales de las asignaturas Métodos de Investigación en Educación y Educación especial, que se imparten en la titulación de Psicopedagogía. El reto: la formación integral del alumnado

Alternative to oral dicoumarin anticoagulants:Considerations in dental care

Introduction: For over 50 years, vitamin K antagonists such as warfarin (Aldocumar®) and acenocoumarol (Sintrom ®) have been the gold standard for reducing the risk of cerebrovascular events. In the last 5 years alternative anticoagulants have been evaluated that act directly upon a concrete target within the coagulation cascade, thereby affording a more predictable anticoagulant effect. The present study offers an update on the new oral anticoagulants and reviews the implications referred to the dental care of patients administered these substances. Material and methods: An exhaustive PubMed-Medline and Cochrane Library search was made of the main alternatives to conventional oral anticoagulation, covering those studies published in English and Spanish over the last 10 years. Specialized textbooks and pharmaceutical catalogs were also consulted. A total of 184 articles were identified, of which 76 met the inclusion criteria. Results: The new oral anticoagulants dabigatran, rivaroxaban and apixaban are safe and effective, and offer a series of advantages, including rapid action, no need for constant monitoring, few drug and food interactions, and a broad therapeutic margin. These drugs are expensive, however, and some lack a specific antidote, while others must be administered twice a day. Regarding the dental treatment of patients receiving these drugs, suspension or modification of the background medication is not required when performing invasive dental procedures, except where indicated by the prescribing physician. Conclusions: The new oral anticoagulants do not pose significantly greater risks than conventional oral anticoagulants when providing invasive dental treatment, and their suspension is not strictly required in such situations

“PREVALENCIA DE LOS PRINCIPALES FACTORES DE RIESGO MODIFICABLES EN PACIENTES SOMETIDOS A REVASCULARIZACIÓN CORONARIA EN EL CENTRO MÉDICO ISSEMYM ”

La prevención es un punto clave en el tratamiento y manejo de la cardiopatíaisqu̩mica, el conocer la prevalencia de los principales factores de riesgo modificables en la poblacion revascularizada de Centro M̩dico ISSEMYM es una herramienta eficaz para la prevención y evitar complicaciones a largo plazo

Discrete Hamilton-Jacobi theory for systems with external forces

This paper is devoted to discrete mechanical systems subject to external forces. We introduce a discrete version of systems with Rayleigh-type forces, obtain the equations of motion and characterize the equivalence for these systems. Additionally, we obtain a Noether's theorem and other theorem characterizing the Lie subalgebra of symmetries of a forced discrete Lagrangian system. Moreover, we develop a Hamilton-Jacobi theory for forced discrete Hamiltonian systems. These results are useful for the construction of so-called variational integrators, which, as we illustrate with some examples, are remarkably superior to the usual numerical integrators such as the Runge-Kutta method.Comment: 30 pages, 3 figures; submitted to a journal, comments are welcom