A nonlinear transformation approach based on a cubication method is developed to obtain the equivalent representation form of conservative two-degree-of-freedom nonlinear oscillators. It is shown that this procedure leads to equivalent nonlinear equations that describe well the numerical integration solutions of the original equations of motion.

This article presents a project that includes APP mutidisciplinardisciplines are as diverse as IT, Engineering, Physics and the public and allows to acquire specific skills of each subject, and develop common generic skills such as teamwork, creative design proposals or communicate orally and in writing. The project has the originality of mixing in the same segments workvarious university students who otherwise would work hardconnected, thereby fostering creativity in a scientific environment. The project's goal is to transform a television program Arguiñano Karlos on a radio program. To do this students must identify, analyze and transform the various scientific, technical and communication are seen on the television program so that it canturn into radio. The choice of this axis of APP is the fruit of long reflection to find a real project that could be put into practice, bringing together aspects of the six subjects

In this work we consider the nonlinear equivalent representation form of oscillators that exhibit nonlinearities in both the elastic and the damping terms. The nonlinear damping effects are considered to be described by fractional power velocity terms which provide better predictions of the dissipative effects observed in some physical systems. It is shown that their effects on the system dynamics response are equivalent to a shift in the coefficient of the linear damping term of a Duffing oscillator. Then, its numerical integration predictions, based on its equivalent representation form given by the well-known forced, damped Duffing equation, are compared to the numerical integration values of its original equations of motion. The applicability of the proposed procedure is evaluated by studying the dynamics response of four nonlinear oscillators that arise in some engineering applications such as nanoresonators, microresonators, human wrist movements, structural engineering design, and chain dynamics of polymeric materials at high extensibility, among others.

ResumenEn el presente trabajo se presenta un método para facilitar la adquisición conjunta de las competencias transversales trabajar en equipo, diseñar propuestas creativas, seleccionar información y comunicarse oralmente y por escrito a estudiantes universitarios de distintos ámbitos de conocimiento. Para conseguirlo, en primer lugar, se diseñó un proyecto siguiendo la metodología del Aprendizaje por Proyectos (APP) y, posteriormente, se contrastó su viabilidad mediante dos planes pilotos que A model for designing learning through multidisciplinary projects Sílvia Espinosa-Mirabet Marianna Soler i Ortega Maria Lluïsa Escoda Jaume Puig-Bargués Inés Ferrer RealUniversitat de Girona (España) AbstractA method used to allow the joint acquisition of generic skills such as teamwork, design creative proposals, select information, oral and written communication to University students from different study programs is presented in this paper. To achieve this goal, first, a project using the methodology of Project Based Learning (PBL) was designed and, second, it was tested carrying out two pilot plans which involved different numbers of students

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