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Poincaré Seminar All session texts, in English or French Organized by the Bourbaki Collaborators Association ALEPH SUB CERO Revista de Divulgación Department of Mathematics and Physics Universidad Nacional Experimental del Táchira_UNET APOD _Astronomy Picture of the Day Daily astronomical images provided by this NASA service Latest Updates December 21, 2013: Newtonian and Einsteinian gravitational theories in great didactic sheet, by Joaquín GONZÁLEZ ÁLVAREZ The excellent book THE NATURE OF SPACE AND TIME by Stephen Hawking and Roger Penrose edited by Princeton Science Library, presents on its cover a beautiful artistic allegory to the gravitational theories used by modern science, the classic by Isaac Newton and the relativist by Albert Einstein , an illustration that, far beyond its aesthetic value, offers teachers and students a didactic image ... December 21, 2013: String theory. The Universe of Superstrings, by Saúl RAMOS-SÁNCHEZ At the end of the 19th century, physics seemed complete. Almost all physical phenomena were described by Newtonian gravitation, electromagnetism, and thermodynamics. In the description of the universe, only a couple of "details" broke the perfection of physics: the photoelectric effect, the longevity of the sun and the elusive ether, among others. It was precisely these open questions that finally led to the violent irruption of Einstein's relativity and quantum mechanics, theories that broke with all known schemes and established the rules for a new way of seeing and understanding what surrounds us in terms of geometry and probability. December 21, 2013: Introduction to Thermodynamics, by Enrique CANTERA DEL RÍO In this documented work the author presents the first and second principles of thermodynamics, studying the virial theorem, equations of state and energy equations of gases. It shows relevant experiences with real gases applying the Van der Waals equation and analyzes the mathematical consequences of the application of the first and second principles in the development of physical processes. December 21, 2013: Continuous applications between topological spaces Este artículo es un pequeño estudio de la definición de aplicación continua entre espacios topológicos, utilizando la noción de entorno del punto de continuidad, y caracterizando la definición por condiciones relativas a los abiertos y cerrados del espacio imagen. Se estudia asimismo la continuidad en un espacio dotado de una métrica y el concepto de continuidad uniforme. 21 diciembre 2013: Sobre la irracionalidad de los números (J+J-1),de R/Q, por Niceto VALCÁRCEL YESTE El autor presenta un trabajo de demostración de la irracionalidad de ciertos números de la forma (J+J-1), de R/Q, en base a la irracionalidad comprobada de otros números relacionados. 21 diciembre 2013: Estudio astrométrico de Messier 13 (I). Estrellas de campo, por Francisco A. VIOLAT BORDONAU Hemos determinado las coordenadas ecuatoriales (J2000) de 74 estrellas del cúmulo Messier 13 midiendo imágenes CCD filtradas, capturadas desde el Observatorio Astronómico de Cáceres, en septiembre de 2013. Se han comparado las posiciones de doce estrellas de campo, no pertenecientes al cúmulo, con las del Catálogo UCAC4: en siete de ellas se han apreciado leves cambios en sus posiciones, compatibles con pequeños movimientos propios, encontrándolos en el rango 1.45 a 41.45 milisegundos de arco/año. 21 diciembre 2013: Observación astronómica en diciembre 2013, por Germán PUERTA Comet ISON had its close encounter with the Sun on Thursday, November 28. Occultation of Saturn by the Moon next day 29. An article about the star of Bethlehem is included. December 21, 2013: Bibliographic news - Math - Physical - Astronomy NOTES, MANUALS AND VIRTUAL BOOKS ON THE NET (Full text works) In this Section there are Notes, Manuals and Books that can be downloaded from the Internet, in full text, very useful for those who study degrees in Physics or Mathematics. 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