Warm intermediate inflation in the Randall-Sundrum II model in the light of Planck 2015 and BICEP2 results: A general dissipative coefficient

A warm inflationary Universe in the Randall-Sundrum II model during intermediate inflation is studied. For this purpose, we consider a general form for the dissipative coefficient $\Gamma(T,\phi)=C_{\phi}\,\frac{T^{m}}{\phi^{m-1}}$, and also analyze this inflationary model in the weak and strong dissipative regimes. We study the evolution of the Universe under the slow-roll approximation and find solutions to the full effective Friedmann equation in the brane-world framework. In order to constrain the parameters in our model, we consider the recent data from the BICEP2-Planck 2015 data together with the necessary condition for warm inflation $T>H$, and also the condition from the weak (or strong) dissipative regime.Comment: 26 pages, 3 figures, accepted for publication in the European Physical Journal

Warm intermediate inflationary Universe model in the presence of a Generalized Chaplygin Gas

A warm intermediate inflationary model in the context of Generalized Chaplygin Gas is investigated. We study this model in the weak and strong dissipative regimes, considering a generalized form of the dissipative coefficient $\Gamma=\Gamma(T,\phi)$, and we describe the inflationary dynamics in the slow-roll approximation. We find constraints on the parameters in our model considering the Planck 2015 data, together with the condition for warm inflation $T>H$, and the conditions for the weak and strong dissipative regimes.Comment: 33 pages, 7 figues, final version accepted for publication in The European Physical Journal C. arXiv admin note: text overlap with arXiv:1504.0747

Intermediate-Generalized Chaplygin Gas inflationary universe model

An intermediate inflationary universe model in the context of a generalized Chaplygin gas is considered. For the matter we consider two different energy densities; a standard scalar field and a tachyon field, respectively. In general, we discuss the conditions of an inflationary epoch for these models. We also, use recent astronomical observations from Wilkinson Microwave Anisotropy Probe seven year data for constraining the parameters appearing in our models.Comment: 16 pages, 2 figure

Hydrogen redox reactions in 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide on platinum single crystal electrodes

Hydrogen oxidation and the subsequent proton reduction are studied on platinum single crystal electrodes in purified 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid. The hydrogen redox reaction shows some dependence of the surface orientation. The highest reversibility is observed with Pt(111) whereas the reaction in electrodes with {100} sites is less reversible and with a slow kinetics. Adsorption states are observed in the presence of hydrogen along with the main oxidation reaction. Also, it is possible to detect protons after oxidation of water and H2O2.APS is grateful to the National University of Colombia (ESP-2011-02) for the scholarship “Estudiantes sobresalientes de posgrado”, and to COLCIENCIAS (567-2012) for the national doctoral scholarship. MFS acknowledges support from the National University of Colombia (Research Project 19030). JMF acknowledges support from Generalitat Valenciana (Feder) (PROMETEO/2009/045) through project PROMETEO/2009/045

Diseño, modelamiento, simulación e implementación de un sistema de levitación magnética (Maglev) con un grado de libertad

In the present work, a magnetic levitation system (maglev) with one degree of freedom (vertical) is designed, simulated and implemented physically. A simplified linear model is first obtained which describes the system. From this model, linear controllers are designed using traditional control methods. We prove these controllers effectiveness to stabilize the system and their performance parameters by simulation. The proposed models are also validated experimentally.En el presente trabajo se diseña, simula e implementa físicamente un sistema de levitación magnética (maglev) con un grado de libertad (vertical). Se deduce teóricamente un modelo simplificado lineal que modela al sistema, a partir del cual se diseñan controladores lineales mediante métodos tradicionales de control. Se prueba la efectividad para estabilizar al sistema y los parámetros de desempeño de dichos controladores mediante simulación. Los modelos propuestos además se validan experimentalmente

System of evaluation of the teaching professional performance for the degrees of the area of biological sciences and health

Este trabajo expone cinco elementos que juzgamos constitutivos de un Sistema de evaluación del desempeño profesional docente situado en el contexto de nuestra contemporaneidad, a saber: 1) la definición de los criterios generales del modelo de gestión del conocimiento para una institución de educación superior congruente a dicho sistema, 2) establecimiento del concepto de profesionalización de la docencia, 3) determinación de las modalidades de evaluación, 4) la serie de funciones docentes que orientan la asunción del rol de mediador, así como, 5) las competencias genéricas que constituyen el perfil profesiográfico en esta área de conocimiento, y las competencias docentes específicas a seis carreras. Los dos últimos elementos, como una fase inaugural de la construcción del referido sistema de evaluación docente en una dependencia de la UNAM. Establecemos, como un marco necesario, las coordenadas socio-históricas en que se inscribe la evaluación, las condiciones y encargo social de la educación superior, así como los condicionantes de la evaluación relativos a la universidad pública. En suma, un sistema como forma de detectar necesidades y definir tendencias de formación o superación, fortalecer la identidad profesional docente, además de un marco para garantizar la calidad de la educación y fundamentar la profesionalización de la docencia.Este trabalho expõe cinco elementos que julgamos constitutivos de um Sistema de avaliação do desempenho profissional docente situado no contexto de nossa contemporaneidade, a saber: 1) a definição dos critérios gerais do modelo de gestão do conhecimento para uma instituição de educação superior congruente a dito sistema, 2) estabelecimento do conceito de profissionalização da docência, 3) determinação das modalidades de avaliação, 4) a série de funções docentes que orientam a assunção do papel de mediador, bem como, 5) as concorrências genéricas que constituem o perfil profesiográfico nesta área de conhecimento, e as concorrências docentes específicas a seis carreiras. Os dois últimos elementos, como uma fase inaugural da construção do referido sistema de avaliação docente numa dependência da UNAM. Estabelecemos, como um marco necessário, as coordenadas sócio-históricas em que se inscreve a avaliação, as condições e encomenda social da educação superior, bem como os condicionantes da avaliação relativos à universidade pública. Em soma, um sistema como forma de detectar necessidades e definir tendências de formação ou superação, fortalecer a identidade profissional docente, além de um marco para garantir a qualidade da educação e fundamentar a profissionalização da docência.This work present five elements that we judge to be unified from a System of evaluation of the professional teaching performance situated in the context of our contemporaneity, to know: 1) the definition of the general criteria of knowledge management models for an institution of higher education consistent with the system, 2) establishment of the concept of teaching professionalization , 3) define the assessment procedures, 4) the series of educational functions that guide the assumption of a mediator role, as well as, 5) the generic competences that constitute the profesiographic profile, in this area of knowledge, and the specific educational competences to six careers. The two last elements, as an opening phase of the construction of the mentioned system of teaching evaluation in a dependency of the UNAM. We establish, as a necessary framework, the associate-historic coordinates in which the evaluation is signed, the conditions and social assignment of the higher education, as well as the conditions of the assessment on the public university. In complement, a system as a way to detect needs and to define tendencies of training and overcoming, to fortify the teaching professional identity, besides a framework to guarantee the quality of the education and to support the professionalization of the teaching

Empagliflozin reduces vascular damage and cognitive impairment in a mixed murine model of Alzheimer's disease and type 2 diabetes

Background Both Alzheimer's disease (AD) and type 2 diabetes (T2D) share common pathological features including inflammation, insulin signaling alterations, or vascular damage. AD has no successful treatment, and the close relationship between both diseases supports the study of antidiabetic drugs to limit or slow down brain pathology in AD. Empagliflozin (EMP) is a sodium-glucose co-transporter 2 inhibitor, the newest class of antidiabetic agents. EMP controls hyperglycemia and reduces cardiovascular comorbidities and deaths associated to T2D. Therefore, we have analyzed the role of EMP at the central level in a complex mouse model of AD-T2D. Methods We have treated AD-T2D mice (APP/PS1xdb/db mice) with EMP 10 mg/kg for 22 weeks. Glucose, insulin, and body weight were monthly assessed. We analyzed learning and memory in the Morris water maze and the new object discrimination test. Postmortem brain assessment was conducted to measure brain atrophy, senile plaques, and amyloid-beta levels. Tau phosphorylation, hemorrhage burden, and microglia were also measured in the brain after EMP treatment. Results EMP treatment helped to maintain insulin levels in diabetic mice. At the central level, EMP limited cortical thinning and reduced neuronal loss in treated mice. Hemorrhage and microglia burdens were also reduced in EMP-treated mice. Senile plaque burden was lower, and these effects were accompanied by an amelioration of cognitive deficits in APP/PS1xdb/db mice. Conclusions Altogether, our data support a feasible role for EMP to reduce brain complications associated to AD and T2D, including classical pathological features and vascular disease, and supporting further assessment of EMP at the central level