Thermodynamics of the BPS Skyrme model

One problem in the application of the Skyrme model to nuclear physics is that it predicts too large a value for the compression modulus of nuclear matter. Here we investigate the thermodynamics of the BPS Skyrme model at zero temperature and calculate its equation of state. Among other results, we find that classically (i.e. without taking into account quantum corrections) the compressibility of BPS skyrmions is, in fact, infinite, corresponding to a zero compression modulus. This suggests that the inclusion of the BPS submodel into the Skyrme model lagrangian may significantly reduce this too large value, providing further evidence for the claim that the BPS Skyrme model may play an important role in the description of nuclei and nuclear matter.Comment: Latex, 26 pages, 1 figure; v2: some typos corrected, version accepted for publication in Phys. Rev.

Las escuelas de los Hermanos de La Salle en Gipuzkoa. Evolución y tendencias en el alumnado y profesorado (1904-2006)

En esta colaboración presentamos un análisis de la presencia de los Hermanos de las Escuelas Cristianas en Gipuzkoa desde 1904 a 2006. Se trata de un estudio de tipo cuantitativo en el que se presenta una división en cuatro etapas: 1904-1937; 1938-1968; 1969-1981 y 1982-2006, con una evolución diferente en lo relativo al alumnado y profesorado en los diferentes centros.Lan honetan Kristau Eskoletako Anaiek Gipuzkoan 1904tik 2006ra bitartean izandako presentzia aztertzen da. Azterlan kuantitatiboa da, lau alditan banatua: 1904-1937; 1938-1968; 1969-1981 eta 1982-2006, eta ikastetxeen arabera ikasleeen eta irakasleen bilakabide desberdina azaltzen duena.Nous présentons ici une analyse de la présence des Frères des Écoles Chrétiennes au Gipuzkoa, de 1904 a 2006. Il s'agit d'une étude quantitative divisée en quatre étapes : 1904-1937 ; 1938-1968 ; 1969-1981 et 1982-2006, avec un évolution différente pour ce qui est des élèves et des enseignants, dans les différents établissements scolaires.In this collaboration we present an analysis of the presence of the Brothersof the Christian Schools in Gipuzkoa between 1904 and 2006. This is a quantitativetype of study divided into four periods: 1904-1937; 1938-1968; 1969-1981 and1982-2006, with different kinds of evolution with respect to pupils and teachers in the different schools

TGRS Observations of Positron Annihilation in Classical Novae

The TGRS experiment on board the Wind spacecraft has many advantages as a sky monitor --- broad field of view (~2 pi) centered on the south ecliptic pole), long life (1994-present), and stable low background and continuous coverage due to Wind's high altitude high eccentricity orbit. The Ge detector has sufficient energy resolution (3-4 keV at 511 keV) to resolve a cosmic positron annihilation line from the strong background annihilation line from beta-decays induced by cosmic ray impacts on the instrument, if the cosmic line is Doppler-shifted by this amount. Such lines (blueshifted) are predicted from nucleosynthesis in classical novae. We have searched the entire TGRS database for 1995-1997 for this line, with negative results. In principle such a search could yield an unbiased upper limit on the highly-uncertain Galactic nova rate. We carefully examined the times around the known nova events during this period, also with negative results. The upper limit on the nova line flux in a 6-hr interval is typically <3.8 E-3 photon/(cm2 s) at 4.6 sigma. We performed the same analysis for times around the outburst of Nova Vel 1999, obtaining a worse limit due to recent degradation of the detector response caused by cosmic ray induced damage.Comment: 5 pp. inc. 3 figs. Proc. 5th Compton Symposium (AIP Conf. Series), ed. M. McConnell, in pres

Implementing a Web Application for W3C WebAuthn Protocol Testing

[Abstract] During the last few years, the FIDO Alliance and the W3C have been working on a new standard called WebAuthn that aims to substitute the obsolete password as an authentication method by using physical security keys instead. Due to its recent design, the standard is still changing and so are the needs for protocol testing. This research has driven the development of a web application that supports the standard and gives extensive information to the user. This tool can be used by WebAuthn developers and researchers, helping them to debug concrete use cases with no need for an ad hoc implementation.Xunta de Galicia; ED431C 2018/4

Developing a Simulation Model for Autonomous Driving Education in the Robobo SmartCity Framework

Abstract: This paper focuses on long-term education in Artificial Intelligence (AI) applied to robotics. Specifically, it presents the Robobo SmartCity educational framework. It is based on two main elements: the smartphone-based robot Robobo and a real model of a smart city. We describe the development of a simulation model of Robobo SmartCity in the CoppeliaSim 3D simulator, implementing both the real mock-up and the model of Robobo. In addition, a set of Python libraries that allow teachers and students to use state-of-the-art algorithms in their education projects is described too.Ministerio de Ciencia, Innovación y Universidades of Spain/FEDER; t RTI2018-101114-B-I00 Erasmus+ Programme of the European Union; 2019-1-ES01-KA201-065742, Centro de Investigación de Galicia “CITIC”; ED431G 2019/01

La lista Edu-Comp, una herramienta para el desarrollo de la Educación Comparada

In this article several academic networks which have been created concerning the compared education are presented and lists of distribution are emphasized, especially the specific ones of the Compared Education (Compared, AFEC-Info and Edu-Comp). The Edu-Comp list, from its creation in 1999, has meant a source of fundamental information for the professionals of the Compared Education (professors, researchers and technical personnel of international organizations. Undoubtedly, the virtual space is a useful tool for the researchers in Compared Education, since we cannot forget that the access to the sources to primary information is a key element for the production of all kind of researches and, specifically, compared ones.  En este artículo se presentan las diferentes redes académicas que se han creado en torno a la educación comparada y se hace hincapié en las listas de distribución, especialmente en las específicas de la Educación Comparada (Compared, AFEC-Info y Edu-Comp). La lista Edu-Comp, desde su creación en 1999 ha supuesto una fuente de información fundamental para los profesionales de la Educación Comparada (docentes, investigadores y técnicos de organismos internacionales). Sin duda, el espacio virtual es una herramienta útil para los investigadores en Educación Comparada, pues no podemos olvidar que el acceso a fuentes de información primaria es un elemento clave para la elaboración de todo tipo de investigaciones y, especialmente, comparadas.In this article several academic networks which have been created concerning the compared education are presented and lists of distribution are emphasized, especially the specific ones of the Compared Education (Compared, AFEC-Info and Edu-Comp). The Edu-Comp list, from its creation in 1999, has meant a source of fundamental information for the professionals of the Compared Education (professors, researchers and technical personnel of international organizations. Undoubtedly, the virtual space is a useful tool for the researchers in Compared Education, since we cannot forget that the access to the sources to primary information is a key element for the production of all kind of researches and, specifically, compared ones