Arquímedes y Hui Liu en torno a círculos y esferas

This article describes the mystery of a long lost codex of Archimedes that resurfaced briefly at the turn of the last century by Johan Ludwig Heiberg. Long enough for the Danish historian of mathematics Heiberg to identify, photograph and eventually transcribe “The Method” and several other works by Archimedes of considerable mathematical interest. In 1879 Heiberg completed his dissertation, Quaestiones Archimedeae, devoted to Archimedes’ life, works, and transmission of his texts.Este artículo describe el misterio de un códice de Arquímedes perdido hace mucho tiempo que reapareció brevemente a principios del siglo pasado de la mano de Johan Ludwig Heiberg. Tiempo suficiente para que el historiador danés de las matemáticas Heiberg pudiese identificar, fotografiar y, finalmente, transcribir “El Método” y varias otras obras de Arquímedes de interés matemático considerable. En 1879 Heiberg completó su tesis doctoral, Quaestiones Archimedeae, dedicado a la vida de Arquímedes, las obras, y la transmisión de sus textos

Archimedes and Liu Hui on Circles and Spheres

This article describes the mystery of a long lost codex of Archimedes that resurfaced briefly at the turn of the last century by Johan Ludwig Heiberg. Long enough for the Danish historian of mathematics Heiberg to identify, photograph and eventually transcribe "The Method" and several other works by Archimedes of considerable mathematical interest. In 1879 Heiberg completed his dissertation, Quaestiones Archimedeae, devoted to Archimedes' life, works, and transmission of his texts.Este artículo describe el misterio de un códice de Arquímedes perdido hace mucho tiempo que reapareció brevemente a principios del siglo pasado de la mano de Johan Ludwig Heiberg. Tiempo suficiente para que el historiador danés de las matemáticas Heiberg pudiese identificar, fotografiar y, finalmente, transcribir "El Método" y varias otras obras de Arquímedes de interés matemático considerable. En 1879 Heiberg completó su tesis doctoral, Quaestiones Archimedeae, dedicado a la vida de Arquímedes, las obras, y la transmisión de sus textos

The unreasonable effectiveness of mathematics: Cartesian linguistics, the mind-body problem and pragmatic evolution

Victor Gomez-Pin highlighted succincty one object of the second Congress on Ontology held in San Sebastián and Barcelona in March of 1996 -by raising two questions due to Husserl about Descartes, namely: is there a persistent value to Descarte's most basic ideas? And if so, can they stimulete new, powerful ideas in our era? Indeed, one of the most interesting and fundamental puzzles that Descartes was the first to face with any success is the nature of the connections between mind and body, and the relevance of mathematics to both. It was the physicist Eugene Wigner, however, who called it the "unreasonable" elfectiveness of mathematics, by which he had in mind above all the powerful applications of mathematics to physics, which have proven crucial for the advance of modem science.1 The Greeks showed and early interest in these most basic questions of ontology and eplstemology, and from the answers given by such ligures as the Pythagoreans and Plato in antiquity, it is clear that mathematics played a fundamental part in their analysis and understanding of nature

Establishment of a novel in vitro implant infection model: effects of electrical stimulation on staphylococci using alternating current

An in vitro system for electrical stimulation of cells and bacteria was developed. Stimulation of cells and bacteria can be conducted under similar conditions. Prior to experiments, numerical simulations were performed. Methods for evaluation of effects were established. Stimulation showed significant effects on bacterial growth and biofilm mass production. Following stimulation, changes in extracellular DNA amounts were detected. In co-culture, stimulation led to increased CFU/ml S. epidermidis in supernatants, on and into MG63 cells on electrode surfaces and chamber bottom