The study of the cure reaction of a diglycidyl ether of bisphenol A epoxy network with isophorone diamine is interesting for evaluating the industrial behavior of this material. The total enthalpy of reaction, the glass-transition temperature, and the partial enthalpies at different curing temperatures have been determined with differential scanning calorimetry in dynamic and isothermal modes. With these experimental data, the degree of conversion and the reaction rate have been obtained. A kinetic model introduces the mechanisms occurring during an epoxy chemical cure reaction. A modification of the kinetic model accounting for the influence of the diffusion of the reactive groups at high conversions is used. A thermodynamic study has allowed the calculation of the enthalpy, entropy, and Gibbs free energy.

In this paper, a case study in 2 nd of BUP (10 th grade) is discussed. Students are asked to solve an open-ended practical activity in Physics which involves the planning of an experimental design and taking a number of decisions in the process. The analysis of transcriptions in two small groups shows some of the difficulties which they experience, as well as their understanding of the roles assigned in the classroom.

Resumen. En este trabajo se analiza, con alumnos de 4º de ESO, la infl uencia de la redacción de un informe de investigación en su aprendizaje conceptual y en su transferencia de conocimiento científi co a la interpretación de una situación hipotética nueva, hallándose una mejoría signifi cativa en la interpretación de la nueva situación. Mediante una metodología cualitativa se profundiza en el análisis del proceso de redacción de informes de investigación, hallándose evidencias que muestran que proporcionó a los estudiantes del estudio un contexto que favoreció el desarrollo de la capacidad de interpretar situaciones reales y que proporcionó diversos tipos de apoyo para el aprendizaje de los estudiantes.Palabras clave. Escritura, informes de investigación, aprendizaje conceptual, transferencia de conocimiento, laboratorio de química. Infl uence of an educative intervention based on writing research reports upon the conceptual learning and the transference of knowledge to the interpretation of situationsSummary. The effect in 10th grade students of writing a research report in their conceptual learning and in their transference of scientifi c knowledge to the interpretation of a hypothetic new situation is analyzed in this work, fi nding a signifi cant improvement in the interpretation of the new situation. By means of a qualitative methodology, the analysis of writing research reports is deepened, fi nding evidences which show that it gave to the students of the study a context that favoured the development of their ability to interpret real situations and that provided several kinds of supports for their learning.

Kerry Dixon is a specialist in interdisciplinary education, with particular focus on integrating visual art into science, technology, engineering and math. Formerly a member of the curatorial staff at the San Francisco Museum of Modern Art, Kerry has also directed two education nonprofit organizations. As director of those organizations, she partnered with The Ohio State University on the creation of a national model for preparing future secondary teachers with a specialization in urban education. In that role, she lead an Innovative Curriculum Design Team and directed OSU faculty and students in the research component of the project. On the smART project, Kerry serves as the arts partner and K-12 education specialist. Her research focuses on making engineering accessible to all students, including students with visual impairments, through the use of art-infused curriculum and models. Prior to becoming focused on student success and retention, her research interests included regulation of intracranial pressure and transport across the blood-brain barrier in addition to various ocular-cellular responses to fluid forces and the resulting implications in ocular pathologies.

En este trabajo se analiza la evolución de las relaciones semánticas entre conceptos desarrolladas por un grupo de estudiantes de secundaria cuando se enfrentan en el laboratorio de Física a tareas prácticas concebidas como problemas. Los resultados indican que el proceso de desarrollar las relaciones semánticas para resolver las tareas fue un proceso laborioso en el que dichas relaciones van atravesando fases de distinta funcionalidad hasta llegar a ser herramientas útiles para la planificación de acciones, aunque en las tareas analizadas no se sigue siempre el mismo camino. Además, a la hora de que los estudiantes sean capaces de resolver una tarea, hemos visto que se superponen otros aspectos, como la presencia de eventuales dificultades epistemológicas y procedimentales.