Why neutron guides may end up breaking down? Some results on the macroscopic behaviour of alkali-borosilicate glass support plates under neutron irradiation

In this paper we report on a first part of a study on the mechanisms leading to brittle fracture in neutron guides made of glass as structural element. Such devices are widely used to deliver thermal and cold neu tron beams to experimental lines in most large neutron research facilities. We present results on macroscopic properties of samples of guide glass substrates which are subjected to neutron irradiation at relatively large fluences. The results show a striking dependence of some of the macroscopic properties such as density, shape or surface curvature upon the specific chemical composition of a given glass. The relevance of the present findings for the installation of either replacement guides at the existing facilities or for the deployment of instruments for ongoing projects such as the European Spallation Source is briefly discussed.

El baloncesto para alumnos con síndrome de Down: propuesta didáctica

Es necesario optimizar aspectos referentes a las capacidades y actitudes de los alumnos con síndrome de Down. Estos aspectos mejorables ayudarán a su desarrollo personal. Pretendemos que los alumnos con esta discapacidad, progresen y mejoren su visión personal, aumenten su autoestima y autonomía y logren desenvolverse adecuadamente en su vida cotidiana. Para ello vamos a crear y poner en práctica una unidad didáctica de Educación Física adaptada, donde el baloncesto será la herramienta fundamental. Dicha unidad didáctica pretende que el alumnado desarrolle su identidad personal al máximo. Para conseguir esto hay que conocer las necesidades individuales de cada uno y darles respuesta a través de una metodología específica y óptima. En nuestra UD, priorizaremos métodos que favorezcan la experiencia directa, la comunicación o la iniciativa; emplearemos estrategias para motivar y desarrollar el interés de los alumnos; diseñaremos diversas actividades para trabajar un mismo contenido; realizaremos ejercicios individuales o grupales y adecuaremos tiempos entre otras adaptaciones. Y todo ello con el apoyo verbal, visual o manual del docente. Con todo lo expuesto esperamos atender y satisfacer las necesidades que cada alumno plantee. ABSTRACT It is important to optimize aspects relating to the skills and attitudes of students with Down Syndrome. The areas for improvement will help with their personal development, self-esteem and increase their personal autonomy to deal with their daily lives. To do this we will create and implement an adapted educational unit using basketball as a fundamental tool. This educational unit is intended for students to develop their personal identity (individuality) to the fullest. To achieve this we must meet the individual needs of each student and apply them through specific and optimal (ideal). In our educational unit, we will prioritize methods that favour the direct experience, communication or initiative. By employing strategies that motivate and develop the student´s interests along with designing various activities that work the same content, for individual and group exercises. All exercises whether verbal, visual or manual will be done under teacher´s supervision. With all the above we hope to serve and meet the needs of each student.