Results on proximal and generalized weak proximal contractions including the case of iteration-dependent range sets

This paper presents some further results on proximal and asymptotic proximal contractions and on a class of generalized weak proximal contractions in metric spaces. The generalizations are stated for non-self-mappings of the forms for and , or , subject to and , such that converges uniformly to T, and the distances are iteration-dependent, where , , and are non-empty subsets of X, for , where is a metric space, provided that the set-theoretic limit of the sequences of closed sets and exist as and that the countable infinite unions of the closed sets are closed. The convergence of the sequences in the domain and the image sets of the non-self-mapping, as well as the existence and uniqueness of the best proximity points, are also investigated if the metric space is complete. Two application examples are also given, being concerned, respectively, with the solutions through pseudo-inverses of both compatible and incompatible linear algebraic systems and with the parametrical

Relativistic force between fast electrons and planar targets

The full retarded electromagnetic force experienced by swift electrons moving parallel to planar boundaries is revisited, for both metallic and dielectric targets, with special emphasis on the consequences in electron microscopy experiments. The focus is placed on the sign of the transverse force experienced by the electron beam as a function of the impact parameter. For point probes, the force is found to be always attractive. The contribution of the induced magnetic field and the causality requirements of the target dielectric response, given by the Kramers-Kronig (K-K) relations, prove to be crucial issues at small impact parameters. For spatially extended probes, repulsive forces are predicted for close trajectories, in agreement with previous works. The force experienced by the target is also explored, with the finding that in insulators, the momentum associated to Cherenkov radiation (CR) is relevant at large impact parameters.

Time transcendence, metadata and future utilization in 3D models of point clouds for heritage elements

Contributed to: Virtual Retrospect 2007 (Pessac, France, Nov 14-16, 2007)

3D line drawing from point clouds using chromatic stereo and shading

1 PDF document (8 pp., English).-- Contributed to: VSMM'08: 14th International Conference on Virtual Systems and Multimedia (Limassol, Cyprus, Oct 20-25, 2008)

Avances de la legislación sobre Responsabilidad Social Empresaria en Argentina

[ES] El objetivo del presente trabajo es reflejar las acciones legislativas que se han emprendido desde el estado argentino en sus diferentes jurisdicciones en materia de responsabilidad social empresaria. A partir del mismo se pretende fijar posición desde la perspectiva de los autores sobre su escenario futuro.

A semantic middleware to enhance current multimedia retrieval systems with content-based functionalities

210 p. : graf.

A comprehensive method for the elastic calculation of the two-point wheel-rail contact

This work shows the method developed to solve the wheel-rail contact problem via a look-up table with a three-dimensional elastic model. This method enables introduction of the two contact point effect on vehicle movement using three-dimensional analysis of surfaces including the influence of the angle of attack. This work presents several dynamic simulations and studies the impact that the introduction of the two contact points on three dimensions has on wear indexes and derailment risk against traditional bidimensional analysis. Furthermore, it studies advantages and disadvantages of using a look-up table against an on-line resolution of the problem.

Reflejos de la Comedia Ática en la Declamación XXVI de Libanio

[ES] El objetivo que se propone el presente trabajo es poner de manifiesto la influencia de la Comedia Atica en la Declamación XXVI de Libanio, una de las llamadas "declamaciones etopoéticas", que se centran en la descripción de caracteres. Estos se construyen a partir de los tipos fijados por la comedia, en el caso de la obra estudiada un δύσκολος y una mujer charlatana, personajes con una amplia tradición detrás de ellos. Por otra parte, se aborda desde un punto de vista "cómico" el tema del matrimonio, sobre el que tratan también, en un sentido muy diferente, los moralistas y los autores de epitalamios. Aflora además la influencia de la comedia ática en el uso de diversos elementos para la caracterización de los personajes (hipérboles, riqueza en imágenes y comparaciones), así como de ciertos recursos propios del género, principalmente el πνῖγος.