Alcoholic and Nonalcoholic Liver Disease: Diagnostic Assessment and Therapeutic Perspectives

Abstract non disponibil

Una introducción a la dinámica no lineal en enseñanza Secundaria

An interesting study on an approach to Physics teaching of an introduction to non-linear dynamics, at a basic level, is presented here. This study, framed on the constructivist theory of learning has led to the actual possibility of explaining in secondary clasrooms the elementary foundations of this outstanding area in modern physics. An initial exploration of the prior beliefs of pupils about mechanics and predictibility constituted the base of this attempt

Una nueva propuesta didáctica para la enseñanza de la relatividad en el Bachillerato

The great importance that has been given to teaching the theory of Relativity in intermediate levels by the new plans of secondary education, is often discouraged by the erroneous treatment of all these topics in the usual didactic formulations. So, in this work we dare to suggest a new point of view which is more accurately attached to the real and original spirit of the genuine Relativity. Our proposal lies on recovering in teaching the ideas of space-time and geometric representations introduced by Minkowski

Enseñanza por cambio conceptual : de la física clásica a la relatividad

In this article the possibility of learning through conceptual change and the best way to achieve this aim, are discussed. This teaching needs to have certain specific features and ensure that the debate in the classroom is focused on the explicit ideas of the students, whose conceptual difficulties must be taken into account with considerable care. To obtain those results, we are to give critical importance to the explanation and justification of ideas, debates must be metacognitive and professors should share discussion in an active and diversified role. One example of this way of teaching is introduced in this article concerning the conceptual change required to pass from classical to relativistic physics

Análisis de resultados métricos de una nube de puntos y una medición directa en el patrimonio edificado. El Santuario de La Montaña en Cáceres

This article makes a comparative study of two types of methods used in building construction. On one hand, the creation of drawings uses direct method, basically by measuring and sketching without instruments and, on the other hand, the creation of these plans by modern laser scanning. The aim is to analyze the accuracy of final results and to consider the technical and other resources needed to carry out each method. Two different works, concerning the same building are compared. More specifically works consist of plan views and section views from a project executed and a scanning with laser technology performed of some parts of the same building. From there we will take out the appropriate cross-section slices to get the information needed to make plan and section views. The outcome will be to get information on the level of accuracy and to assess the technical effort required in each case.El objetivo del presente artículo consiste en realizar un estudio comparativo entre dos procedimientos utilizados en el levantamiento de un edificio: método directo sin instrumentación y escaneado láser que proporciona nubes de puntos de gran densidad. Se pretende analizar el grado de exactitud de los resultados y los recursos y medios técnicos precisos para llevar a cabo cada una de las tecnologías. La metodología consistirá en comparar dos trabajos relativos al mismo edificio. Por un lado, se cuenta con unos planos de planta y sección de un proyecto orientado a la rehabilitación del edificio. Por otra parte, se utiliza un escaneado con tecnología láser, del que se tomará una selección de puntos precisa para obtener la información necesaria para poder realizar los planos de planta y sección, equivalentes a los anteriores. El resultado consistirá en tener una información del grado de exactitud de cada método, valorando el esfuerzo técnico que requiere cada uno de ellos

Kinetics of the Catalytic Thermal Degradation of Sugarcane Residual Biomass Over Rh-Pt/CeO2-SiO2 for Syngas Production

Thermochemical processes for biomass conversion are promising to produce renewable hydrogen-rich syngas. In the present study, model fitting methods were used to propose thermal degradation kinetics during catalytic and non-catalytic pyrolysis (in N2) and combustion (in synthetic air) of sugarcane residual biomass. Catalytic processes were performed over a Rh-Pt/CeO2-SiO2 catalyst and the models were proposed based on the Thermogravimetric (TG) analysis, TG coupled to Fourier Transformed Infrared Spectrometry (TG-FTIR) and TG coupled to mass spectrometry (TG-MS). Results showed three different degradation stages and a catalyst effect on product distribution. In pyrolysis, Rh-Pt/CeO2-SiO2 catalyst promoted reforming reactions which increased the presence of H2. Meanwhile, during catalytic combustion, oxidation of the carbon and hydrogen present in biomass favored the release of H2O, CO and CO2. Furthermore, the catalyst decreased the overall activation energies of pyrolysis and combustion from 120.9 and 154.9 kJ mol−1 to 107.0 and 138.0 kJ mol−1, respectively. Considering the positive effect of the Rh-Pt/CeO2-SiO2 catalyst during pyrolysis of sugarcane residual biomass, it could be considered as a potential catalyst to improve the thermal degradation of biomass for syngas production. Moreover, the proposed kinetic parameters are useful to design an appropriate thermochemical unit for H2-rich syngas production as a non-conventional energy technology.This research was funded by Colciencias (Francisco Jose de Caldas Fund) and Universidad de La Sabana through the Project ING-221 (Colciencias contract 548–2019) and The International Relations Department of University of Alicante for the financial support through the program named “University Development Cooperation 2018”