Using the diffusion model associated by the author with the wave equations, a part of current quantum radiation theory is reformulated so that the characteristic divergences in the associated calculations no longer arise. The reformulation does this by stipulating, on purely physical grounds, that a transition involving a “virtual” quantum must include a high frequency “cutoff” factor in its interaction Hamiltonian. For a transition involving a “real” quantum, the stipulation is that the “cutoff” factor is not to be included.

The development of children must be an integral part of their educational environment, focusing on strengthening their learning and social skills. The research is framed in the design of didactic material, under the perspective of product design. As a discipline of study, it focuses on the needs andparticularities of the rural educational environment and attempts to support the integral development that Ecuadorian education has been pursued. In this context, with a qualitative approach, the characteristics of the environment are collected, as (...) well as the perspectives of basic general education teachers, inrelation to the integral education and the existing materials in formal education. In a comparative analysis, we analyzed data obtained with similar training projects, which show the importance of working on social skills in children. The results determine parameters and requirements to develop didactic products that complement education, based on concepts of design, pedagogy, and didactics as knowledge-building tools. Keywords: Product Design, Teaching Material, Comprehensive Training, Social Skills. (shrink)

La correspondance entre Descartes et Huygens, quoique maintenant absorbée dans le corpus général des lettres de Descartes, garde son intérêt et son importance propre. A part son caractère unique, comme série complète de lettres échangées entre deux hommes d’une distinction si différente, elle nous montre avec quelle précaution il nous faut accepter le texte des lettres de Clerselier et le récit de Baillet sur la vie de Descartes en Hollande. Et comme toutes les vies de Descartes reposent finalement sur Clerselier (...) et Baillet, notre Correspondance nous montre qu’il est nécessaire d’examiner à nouveau tout le problème. (shrink)

[ES] En este trabajo [1] se especifican los aspectos centrales de la estructura y contenido de la monumental obra de Nicolai Hartmann, recientemente traducida al castellano, Ética, y [2] en correspondencia con lo anterior, se indica sumariamente el propósito de su planteamiento ético. [EN] In this work (1) it is specified the central aspects of the structure and content of Nicolai Hartmann´s monumental oeuvre, recently translated into Spanish, Ethics, and (2) in correspondence with the above, it is summarily indicated the (...) purpose of his ethical approach. (shrink)