Achievement of the recommendations of intake of vitamin D and calcium in patients with osteoporosis

Objetivos: - Conocer los aportes diarios de vitamina D y calcio (suplementos farmacológicos y dieta) en mujeres mayores de 65 años. - Conocer si existe relación entre el consumo diario de vitamina D y las variables clínicas y sociodemográficas

Decision making and model M. Mishel. Accept or not accept replacement surgery knee prosthetic

Introducción: La artroplastia total de rodilla (PTR) es eficaz en el alivio del dolor y la función en los casos de artrosis de rodilla (AR) grave. Representa un problema de salud pública por su prevalencia. A pesar de los resultados clínicos obtenidos con la PTR, diversos estudios refieren que entre un 14-30% de pacientes se muestran insatisfechos con el resultado, al no alcanzar los beneficios esperados, lo que conlleva que otros desestimen el tratamiento quirúrgico. El modelo de cuidados de M. Mishel pertenece al paradigma de la transformación, parte de la teoría social crítica e incorpora principios de la teoría del caos para elaborar su teoría de la incertidumbre; la enfermedad crónica desencadena un desequilibrio y las personas que la experimentan pueden incorporar esta incertidumbre para adquirir un nuevo sentido de la vida

Melhoramento ótico de células solares tandem com base em silício cristalino

CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia SolarRESUMO: A estratégia mais promissora para reduzir o custo da eletricidade fotovoltaica é o aumento da eficiência dos sistemas. As células de silício cristalino estão cada vez mais próximas do seu limite teórico de eficiência, sendo por isso progressivamente mais difícil aumentar a sua de eficiência. As células solares tandem com base em silício cristalino são um dos caminhos mais promissores para atingir uma eficiência de conversão para além dos 30% com um custo competitivo. Neste artigo é apresentada uma proposta de célula tandem com base em silício cristalino de com três terminais em que as subcélulas são ligadas em paralelo, sendo também propostas algumas estratégias para melhorar as propriedades óticas deste dispositivo. São apresentados os resultados do desenvolvimento de um método de melhoramento do desempenho ótico do silício cristalino, baseado em gravação química assistida por metal, e de simulações numéricas de dispositivos.ABSTRACT: The most promising strategy to reduce the cost of photovoltaic electricity is to increase the systems’ efficiency. Crystalline silicon cells are getting closer to their theoretical efficiency limit, which is why it is progressively more difficult to increase their efficiency. Crystalline silicon-based tandem solar cells are one of the most promising ways to achieve conversion efficiency beyond 30% at a competitive cost. This article presents a proposal for a tandem cell based on crystalline silicon with three terminals in which the subcells are connected in parallel, and some strategies to improve the optical properties of this device are proposed. The results of the development of a method to improve the optical performance of crystalline silicon, based on metal-assisted chemical etching and numerical device simulations’ results are presented.info:eu-repo/semantics/publishedVersio

Emergence of human angiohematopoietic cells in normal development and from cultured embryonic stem cells

Human hematopoiesis proceeds transiently in the extraembryonic yolk sac and embryonic, then fetal liver before being stabilized in the bone marrow during the third month of gestation. In addition to this classic developmental sequence, we have previously shown that the aorta-gonad-mesonephros (AGM) embryonic territory produces stem cells for definitive hematopoiesis from 27 to 40 days of human development, through an intermediate blood-forming endothelium stage. These studies have relied on the use of traditional markers of human hematopoietic and endothelial cells. In addition, we have recently identified and characterized a novel surface molecule, BB9, which typifies the earliest founders of the human angiohematopoietic system. BB9, which was initially identified with a monoclonal antibody raised to Stro-1(+) bone marrow stromal cells, recognizes in the adult the most primitive Thy-1(+) CD133(+) Lin(−), non-obese diabetic—severe combined immunodeficiency disease (NOD–SCID) mouse engrating hematopoietic stem cells (HSCs). In the 3- to 4-week embryo,BB9expression typifies a subset of splanchnopleural mesodermal cells that migrate dorsally and colonize the ventral aspect of the aorta where they establish a population of hemogenic endothelial cells. We have indeed confirmed that hematopoietic potential in the human embryo, as assessed by long-term culture-initiating cell (LTC-IC) and SCID mouse reconstituting cell (SRC) activities, is confined to BB9-expressing cells. We have further validated these results in the model of human embryonic stem cells (hESCs) in which we have modeled, through the development of hematopoietic embryoid bodies (EBs), primitive and definitive hematopoieses. In this setting, we have documented the emergence of BB9(+) hemangioblast-like clonogenic angiohematopoietic progenitors that currently represent the earliest known founders of the human vascular and blood systems

Composants électrochimiques : Électrolyseur, pile à combustible, supercondensateur, accumulateur

National audienc

Composants électrochimiques : Électrolyseur, pile à combustible, supercondensateur, accumulateur

National audienc

Diagnosis of a commercial PEM fuel cell stack via incomplete spectra and fuzzy clustering

International audienceTo realize the commercialization of proton exchange membrane (PEM) fuel cells, durability and reliability remain big challenges. This paper aims to develop a fault detection, identification and analysis methodology based on a commercial fuel cell system. Effect of air stoichiometry is studied using electrochemical impedance spectroscopy (EIS). Relevant faults are: oxygen starvation, water flooding and drying. Based on the EIS measurements, a non-model based methodology is proposed consisting of four parts: feature extraction based on the spectra, feature selection, fuzzy clustering and fault analysis. Validity of the proposed diagnostic methodology is verified experimentally

Multiphysics simulation of a PEM electrolyser: Energetic Macroscopic Representation approach

International audienceIn this paper, a graphical model of Proton Exchange Membrane (PEM) electrolyser is presented. The modelling is performed with respect to a generic approach then it is tuned regarding the electrolyser considered for the experimental validation. The graphical modelling based on Energetic Macroscopic Representation (EMR) has advantages such as readability, modularity, structural and functional characteristics. The EMR modelling presented here allows the modelling of multi-physics components and highlights the interactions of the electrochemical, thermodynamical, thermal and fluidic phenomena that occur simultaneously in an electrolyser. Generally, in electrolyser models, the temperature is considered as a parameter with different constant values and its influence on other variables of the model is observed. In this paper, the dynamic evolution of the temperature in the stack and the supply water tank is described. The static behaviour of the electrical variables is also studied. To validate the model, a small-scale laboratory electrolyser is used as an experimental tool. The electrical parameters are identified using Matlab/Simulink curves fitting tools. Then, the whole model is simulated. The simulation results fit very well the experimental data. Furthermore, the parameters values of this model are compared to those of the literature and their relevance is pointed out. Using Energetic Macroscopic Representation, the proposed model describes accurately the experimental electrolyser; moreover it can be easily adapted to other electrolysers