Search results for " norma"
showing 10 items of 623 documents
Demo 20. Plano inclinado
2013
Objetivo: Demostrar que el coeficiente de rozamiento sólo depende de la naturaleza de las superficies en contacto. Poner de manifiesto la diferencia entre rozamiento estático y dinámico.
PISA y TALIS ¿congruencia o discrepancia?
2016
Las evaluaciones educativas internacionales a gran escala ofrecen información de interés para la comunidad educativa, científica y política. Son muchos los estudios derivados de ellas, tanto a nivel nacional como internacional. Por otra parte, es bien conocida, desde el origen de estas macroevaluaciones, la diversidad de valoraciones que han generado. En este contexto, el objetivo del trabajo que aquí se presenta es estudiar las relaciones entre los resultados de PISA 2012 y los relativos a práctica docente de secundaria de TALIS 2013, tratando de analizar las congruencias o discrepancias entre los resultados de ambas. Se tomaron los datos del estudio TALIS-PISA link. Los análisis realizado…
Interpretaciones no intencionadas e intencionadas y usos de los resultados de PISA: Una perspectiva de validez consecuencial
2016
Este artículo explora la relevancia de considerar las consecuencias de las pruebas como parte de las discusiones acerca de la validez, la investigación sobre validación, en el contexto del Programa Internacional para la Evaluación de Estudiantes de la OCDE, PISA. Lo primero que describe la concepción moderna de validez como un aspecto fundamental de la calidad de los ensayos y sistemas de pruebas, es que evoluciona en torno a las interpretaciones propuestas y usos de las puntuaciones de las pruebas: "La validez se refiere al grado en el cual la evidencia y la teoría apoyan las interpretaciones de las puntuaciones de las pruebas sobre las propuestas de su uso en los test. La validez es, por …
Evaluation of MRI and cannabinoid type 1 receptor PET templates constructed using DARTEL for spatial normalization of rat brains
2015
Purpose: Image registration is one prerequisite for the analysis of brain regions in magnetic-resonance-imaging (MRI) or positron-emission-tomography (PET) studies. Diffeomorphic anatomical registration through exponentiated Lie algebra (DARTEL) is a nonlinear, diffeomorphic algorithm for image registration and construction of image templates. The goal of this small animal study was (1) the evaluation of a MRI and calculation of several cannabinoid type 1 (CB1) receptor PET templates constructed using DARTEL and (2) the analysis of the image registration accuracy of MR and PET images to their DARTEL templates with reference to analytical and iterative PET reconstruction algorithms. Methods:…
Potential drug-drug interaction between duloxetine and acenocoumarol in a patient with Alzheimer's disease
2007
Abstract Background : Recent evidence suggests that duloxetine may increase the effect of warfarin, thereby increasing the possibility of bleeding. However, a MEDLINE search for articles published between 1980 and May 2007 (terms: duloxetine , anticoagulants , acenocoumarol , and interaction ; no language restriction) did not yield any reports of an interaction between concomitant use of duloxetine and acenocoumarol. Objective : The aim of this study was to describe a potential drug-drug interaction between duloxetine and acenocoumarol in a patient with Alzheimer's disease. The possible mechanism of this potential interaction is examined. Case summary : This report presents the case of a 63…
EEG Effective Source Projections Are More Bilaterally Symmetric in Infants Than in Adults
2020
Although anatomical brain hemispheric asymmetries have been clearly documented in the infant brain, findings concerning functional hemispheric specialization have been inconsistent. The present report aims to assess whether bilaterally symmetric synchronous activity between the two hemispheres is a characteristic of the infant brain. To asses cortical bilateral synchronicity, we used decomposition by independent component analysis (ICA) of high-density electroencephalographic (EEG) data collected in an auditory passive oddball paradigm. Decompositions of concatenated 64-channel EEG data epochs from each of 34 typically developing 6-month-old infants and from 18 healthy young adults particip…
The Impact of School Closure on Adolescents’ Wellbeing, and Steps toward to a New Normal : The Need for an Assessment Tool Update?
2021
International audience; Close to 200 countries have implemented school closures to decrease the spread of the COVID-19 coronavirus. Though the closures have seemed necessary, their effects on the wellbeing of children and adolescents have raised serious concerns. To truly understand the impact of such disruption on young people’s wellbeing, and their views on how to move towards a new normal, we must adopt different approaches to gather the data to secure children’s and adolescents’ rights to be heard in the issues that concern their lives. Current ways to examine the impacts of school closure have been dominated by gathering information concerning the children and adolescents, using mainly…
Analysis of cardiac and pulmonary complication probabilities after radiation therapy for patients with early-stage breast cancer
2009
Objective. The purpose of this study was to evaluate the radiobiological implications of clinical use of respiratory-gated techniques for postoperative radiation therapy of early-stage left-sided breast cancer after breast-conserving surgery. Material and methods. Radiation therapy treatment plans of 80 patients with early-stage breast cancer (stage I–II), receiving whole breast irradiation after breast-conserving therapy, were analyzed. The control group consisting of 47 patients received standard radiation therapy, and the respiratory-gated group consisting of 33 patients received deep inspiration-gated radiation therapy. Normal tissue complication probabilities (NTCP) for cardiac mortali…
A score model for the continuous grading of early allograft dysfunction severity
2014
Early allograft dysfunction (EAD) dramatically influences graft and patient outcomes. A lack of consensus on an EAD definition hinders comparisons of liver transplant outcomes and management of recipients among and within centers. We sought to develop a model for the quantitative assessment of early allograft function [Model for Early Allograft Function Scoring (MEAF)] after transplantation. A retrospective study including 1026 consecutive liver transplants was performed for MEAF score development. Multivariate data analysis was used to select a small number of postoperative variables that adequately describe EAD. Then, the distribution of these variables was mathematically modeled to assig…