Jorge Jimenez

In order to understand the rise of runaway solutions in the radiation reaction problem a mechanical model is used. An alternative demonstration of Daboul’s theorem, through Hurwitz’s criterion, is given. The origin of runaway solutions in electrodynamics is discussed. They arise when the particle has a negative mechanical mass or when approximations are used in the equation of motion. In the 1-dimensional mechanical model an exact and linear equation of motion for the particle is obtained, the corresponding exact solution is again runaway when the mechanical mass is negative. The exact solution is not runaway when the mechanical mass is positive. However, the use of approximations leads to an equation of motion which has runaway solutions. It is exhibited that the use of approximations in the 3-dimensional mechanical model is completely necessary because the general equation of motion for the particle is non-linear. The analysis of this case proceeds in a very similar way to the one carried out in electrodynamics. This means that the number of dimensions also plays an important role in the analysis

This article focusses on corporate attitudes to stakeholder environmental pressures in Argentina. It uses a cross section survey of 505 CEOs of Argentinean firms to gather information on environmental attitudes and a stakeholder theory framework to design and interpret the statistical analyses. It is underpinned by theoretical and empirical findings in the literature on stakeholder management, targeting in particular studies that deal with corporate social responsibility (CSR) in Latin America. Its general aim is to gain a deeper empirical understanding of the coherence between managers' perceptions of stakeholder pressures and the importance they are given in corporate CSR strategies through an empirical investigation of environmental management (EM) decisions. In doing so, it uncovers general differences in the way firms perceive and treat groups of stakeholders. It also detects variations across firms, observing that some are typically proactive in their response to stakeholder pressures whilst others are less responsive. Profiling the various stakeholder networks and the corporate response strategies in this way encourages the development of stakeholder-focussed policies and corporate strategies that emphasise communications, awareness and a clear sense of direction. It concludes that CSR appears to be more effective in the protection of the environment than previously reported. Although this study focusses on EM in Argentina, the findings are more generally applicable

An alternative approach to analyze the nonrelativistic quantum dynamics of a rigid and extended charged particle taking into account the radiation reaction is discussed with detail. Interpretation of the field operators as annihilation and creation ones, theory of perturbations and renormalization are not used. The analysis is carried out in the Heisenberg picture with the electromagnetic field expanded in a complete orthogonal basis set of functions which allows the electromagnetic field to satisfy arbitrary boundary conditions. The corresponding coefficients are the field operators which satisfy the usual commutation relations. A nonlinear equation of motion for the charged particle is obtained. A careful consideration of the quantum effects allows the derivation of a linear equation of motion which is free of both runaway solutions and preacceleration, even for a point charge. Also, the electromagnetic mass, which is defined as the coefficient of the acceleration operator, vanishes for a point particle. However, this does not mean that the results are free of ambiguities which are exhibited and discussed.

The purpose of this study is to determine empirically the state of the art of the medical care, when healthcare personal is confronted with ethical dilemmas related with the care they give to the geriatric population. An observational, longitudinal, prospective and qualitative study was conducted by analyzing the correlation between healthcare personnel–patient relationship, and ethical judgments regarding dilemmas that arise in daily clinical practice with geriatric patients. Mexican healthcare personnel with current active practices were asked to write up an ethical dilemma that arose frequently or that had impacted their medical practice. From the narrative input, we were able to draw up a database with 421 dilemmas, and those corresponding to patients 60 years and older were selected. The axiological analysis of the narrative dilemmas of geriatric patients was made using dialectical empiricism. The axiological analysis values found most frequently were classified into three groups: the impact of healthcare, the roles of the physician, and refusal of therapy; the healthcare role of educator, caring for the patients’ life and the risk of imminent death where the values found more often. The persistence and universality of certain dilemmas in geriatrics calls for awareness and requires a good training in the ethical discernment of these dilemmas. This would help to improve substantially the care and the life quality of this population.

Este artículo tiene por objetivo el análisis de los principales aportes a una nueva vision del catolicismo y elaboración teológica de la Federazione Universitaria Cattolica Italiana entre 1933 y 1939. La FUCI, la organización oficial de Acción Católica para los estudiantes universitarios de la época, fue liderada por Giovanni Battista Montini, el futuro Papa Pablo VI, entre 1925 y 1933. Hasta el día de hoy, la organización es principalmente conocida por haber formado en sus filas a gran parte de la futura clase dirigente demócrata cristiana que gobernaría Italia durante buena parte de la segunda mitad del siglo XX. Así, otros procesos de igual valor han tendido a ser dejados de lado por la historiografía. Este artículo pretende colaborar a llenar este vacío, concentrándose en la elaboración teológica de la federación, en especial la formación de la personalidad cristiana en torno a un cristianismo 'totalitario', la eclesiología de Emilio Guano y los nuevos modelos de santidad del período, todo con el fin último de ofrecer una variante de una modernidad católica para la Iglesia del período.