Analysis of Oscillations in a Cableway: Wind Load Effects

[EN] The purpose of this paper is to develop and investigate a non-linear model for analysing the reaction of a self-detachable cabin monocable ropeway exposed to a sudden deceleration and wind forces. The First and Second Newton's Law and Differential Equations are the basic tools for building the model. Furthermore a few basic considerations have been made about the air “dragging and lifting" forces that induce oscillations and vibrations in mechanical systems alike. All the numerical data used for the simulation was taken from a ropeway in the skiing site of Ravascletto-Zoncolan in the North- East of Italy.[ES] El propósito de este trabajo de carácter didáctico es el de desarrollar e investigar un modelo no lineal para el análisis de la reacción de una cabina de auto-aesmontable teleférico monocable expuesto a una desaceleración repentina y a las fuerzas del viento. La ley y las ecuaciones diferenciales de primer y segundo lugar de Newton son las herramientas básicas para la construcción del modelo. Además algunas consideraciones básicas se han hecho sobre el aire. Todos los datos numéricos utilizados para la simulación fueron tomados desde un teleférico en la estación de esquí de Ravascletto-Zoncolan en el noreste de Italia.The author Lluís M. Garcia Raffi want to thank EICE MoMa (UPV) for the help in thedevelopment of this work under grants PIME 2011/A09 y PID-DMA 2012. The author Jan Gustincic want to thanks to prof. Giuliano Stabon (University of Trieste) for providing the knowledge of the topic and the parameters values. Thanks also to Francesca D'Urzo for editing the paper.Gustincic, J.; Garcia-Raffi, LM. (2013). Analysis of Oscillations in a Cableway: Wind Load Effects. Modelling in Science Education and Learning. 6(1):145-155. doi:10.4995/msel.2013.1847SWORD14515561Halliday, Resnick, Krane. Physics 1 (2006)

Primeros pasos con las tareas de modelización en secundaria

[EN] The growing importance of skills in our education system emphasizes the need not only of methodological changes in the teaching of mathematics in compulsory secondary education, but also to design new tools to develop the basic competences in general and mathematical competence in particular our students. The problems of modelling, in the context of realistic mathematics education, become an important tool for this purpose. In this paper we describe the design and implementation of a pilot activity modelling with students aged 15-16 as a first step in the introduction of this type tasks in the programming course.[ES] La creciente importancia de las competencias en nuestro sistema educativo pone de manifiesto la necesidad, no solo de introducir cambios metodológicos en el proceso de enseñanza de las Matemáticas en la educación secundaria obligatoria, sino también de diseñar nuevos instrumentos que permitan desarrollar las competencias basicas en general, y la competencia matemática en particular, de nuestros alumnos. Los problemas de modelización, dentro del marco de la educación matemática realista, se convierten en una herramienta importante para este fin. En esta comunicación describimos el diseño y la implementación de una actividad piloto de modelización con alumnos de 4oESO, como primer paso para la introducción de este tipo de tareas en la programación de la asignatura.Lluís Miquel Garcia Raffi es el coordinador del EICE MoMa de la UPV y quiere agradecer el apoyo de las ayudas PIME 2011/A09 y PID-DMA 2012.Gallart Palau, C.; Garcia-Raffi, LM. (2013). Primeros pasos con las tareas de modelización en secundaria. Modelling in Science Education and Learning. 6(1):49-60. doi:10.4995/msel.2013.1839SWORD496061R. Borromero, Theorical and empirical di erentiations of phases in the modeling process. Zentralblatt fur Didaktik der Mathematik, 38(2) (2006).Iversen, S. M., & Larson, C. J. (2006). Simple thinking using complex math vs. complex thinking using simple math—A study using model eliciting activities to compare students’ abilities in standardized tests to their modelling abilities. ZDM, 38(3), 281-292. doi:10.1007/bf02652811M. Sol, Projectes matemàtics a l'Educació Secundària Obligatioria. Tesis Doctoral (1998).Grup Vilatzara Experiencias sobre proyectos e investigaciones matemáticas en secundaria. Revista Números. Revista de Didáctica de las Matemáticas. Sociedad Canaria Isaac Newton de Profesores de Matemáticas 46, 29-46 (2001)

Long-term Mortality in HIV-Positive Individuals Virally Suppressed for >3 Years With Incomplete CD4 Recovery

Virally suppressed HIV-positive individuals on combination antiretroviral therapy who do not achieve a CD4 count >200 cells/µL have substantially increased long-term mortality. The increased mortality was seen across different patient groups and for all causes of deat

Analysis of Oscillations in a Cableway: Wind Load Effects

The purpose of this paper is to develop and investigate a non-linear model for analysing the reaction of a self-detachable cabin monocable ropeway exposed to a sudden deceleration and wind forces. The First and Second Newton's Law and Differential Equations are the basic tools for building the model. Furthermore a few basic considerations have been made about the air “dragging and lifting" forces that induce oscillations and vibrations in mechanical systems alike. All the numerical data used for the simulation was taken from a ropeway in the skiing site of Ravascletto-Zoncolan in the North- East of Italy

Álgebra lineal y juegos de mesa

In this paper we present three examples that can be used to motivate and introduce classical notions of a course of Linear Algebra (and its connection with other subjects such as Probability and Computing) in an Engineering degree. More specifically in this article we shown how the use of Linear algebra allows us to study odds and winning strategies by means of three board games: one of Coins, the game called Snakes and Ladders© and finally the well-known Monopoly©.</p

Long-term mortality in HIV-positive individuals virally suppressed for >3 years with incomplete CD4 recovery.

International audienceSome human immunodeficiency virus (HIV)-infected individuals initiating combination antiretroviral therapy (cART) with low CD4 counts achieve viral suppression but not CD4 cell recovery. We aimed to identify (1) risk factors for failure to achieve CD4 count >200 cells/µL after 3 years of sustained viral suppression and (2) the association of the achieved CD4 count with subsequent mortality. We included treated HIV-infected adults from 2 large international HIV cohorts, who had viral suppression (≤500 HIV type 1 RNA copies/mL) for >3 years with CD4 count ≤200 cells/µL at start of the suppressed period. Logistic regression was used to identify risk factors for incomplete CD4 recovery (≤200 cells/µL) and Cox regression to identify associations with mortality. Of 5550 eligible individuals, 835 (15%) did not reach a CD4 count >200 cells/µL after 3 years of suppression. Increasing age, lower initial CD4 count, male heterosexual and injection drug use transmission, cART initiation after 1998, and longer time from initiation of cART to start of the virally suppressed period were risk factors for not achieving a CD4 count >200 cells/µL. Individuals with CD4 ≤200 cells/µL after 3 years of viral suppression had substantially increased mortality (adjusted hazard ratio, 2.60; 95% confidence interval, 1.86-3.61) compared with those who achieved CD4 count >200 cells/µL. The increased mortality was seen across different patient groups and for all causes of death. Virally suppressed HIV-positive individuals on cART who do not achieve a CD4 count >200 cells/µL have substantially increased long-term mortality