This paper addresses the existence of Hopf bifurcations in a directed acyclic network of neurons, each of them being modeled by a Hindmarsh–Rose neuronal model. The bifurcation parameter is the small parameter corresponding to the ratio of time scales between the fast and the slow dynamics. We first prove that, under certain hypotheses, the single uncoupled neuron can undergo a Hopf bifurcation. Hopf bifurcation occurrences in a directed acyclic network of HR neurons are then discussed. Numerical simulations are carried out (...) to observe these bifurcations and to illustrate the theoretical results. (shrink)

N Blake, P Standish; Preface, Journal of Philosophy of Education, Volume 34, Issue 1, 16 December 2002, Pages 197–198, https://doi.org/10.1111/1467-9752.00168.

CONTENIDO: Pensar temáticamente la filosofía - Nosotros y la filosofía - El método en la construcción del discurso filosófico - El mundo circundante: estudio sobre la conciencia, la toma de conciencia y la realización de la conciencia - El puesto de la estética en la filosofía - Sobre el concepto de naturaleza en empédocles - La pregunta por la técnica en serenidad de M. Heidegger - Cuatro paradojas en el proyecto de la filosofía latinoamericana - La secularización de la cultura: (...) una exigencia para la modernidad - El concepto de imagen y de política en paradiso de José Lezama Lima. (shrink)

Tres filósofos catalanes: Joaquín Xirau. Eduardo Nicol. José Ferrater Mora.--La herencia de Ortega y Gasset: José Gaos. Luis Recaséns Siches. Manuel Granell. Francisco Ayala. María Zambrano.--Dos filósofos independientes: Juan D. García Bacca. Eugenio Imaz.--Panorama general de la filosofía española en América.

The aim of this paper is to give a characterisation of religion and the Religious Spirit, basing itself on the Platonic assumption that there are Forms, salient jewels of simplicity and affinity, to be dug out from the soil of vague experience and cut clear from the confusedly shifting patterns of usage, which will give us conceptual mastery over the changeable detail in a given sector. It will further be Platonic in that it will not seek to discount the deep (...) gulfs between the species into which religion qua genus divides itself, i.e. its theistic, polytheistic and atheistic subvarieties, taking it to be of the essence of a true genus to extend itself over mutually exclusive species, only being what it is by including in its sense the alternatives which are thus mutually exclusive. And my treatment will be Platonic, thirdly, in that it will endeavour to delimit the Religious Spirit by, on the one hand, setting it over against what it excludes, all purely this-world talk and life which is quite irreligious, and by, on the other hand, opposing it to forms of talk and life which fall short of it in various ways or which deviate from it variously, thereby likewise contributing to our understanding of what it is. The practice of Plato, which could study the deviations from his ideal city in order to confirm his notion of its structure and excellence, and which also paired every ideal pattern with its opposite— piety with impiety, justice with self-interested tyranny, etc.—is plainly one to be followed: Plato, as we know from a citation from his contemporary Hermodorus in one of the Aristotelian commentators, always set beside the ‘in itself’ of the pure Form the deviant and the wholly negative which were nonetheless part of its sense. Religion will therefore stand before us as a target that it is possible to fall short of or miss altogether as well as to hit squarely, and we shall try by a series of glancing darts to end by hitting it squarely. (shrink)

Articles on fundamentals of Hinduism, philosophy, and culture.

Das Vorhandensein bilateraler Asymmetrie bei Organismen ist an und für sich biophysikalisch verständlich. Schwierigkeiten entstehen jedoch beim Versuch die auffallende Ungleichheit in den Häufigkeiten des Vorkommens von Rechts- und Linksasymmetrie biophysikalisch zu deuten. Es werden zwei Möglichkeiten für solch'eine Deutung besprochen. Die eine stützt sich auf die fundamentale Asymmetrie des elektromagnetischen Feldes, und wird als biologisch weniger geeignet angesehen. Die andere, welche dem Verfasser als wahrscheinlicher erscheint, beruht auf der Asymmetrie der organischen Moleküle.L'existence d'une asymétrie bilaterale en général chez des (...) organismes divers n'offre pas de difficulté particulière du point de vue biophysique. Mais les difficultés surgissent quand on tâche de comprendre l'inégalité très prononcée des cas d'asymétrie droite et gauche. Deux possibilités sont discutées dans ce mémoire. L'une repose sur l'asymétrie fondamentale du champs électromagnétique. Cette explication est considérée comme moins probable. Une autre explication qui nous apparaît plus probable, est fondée sur l'asymétrie moléculaire. (shrink)