Diachronic analiysis of motor comunication in traditional games and sports of the canary island

Se realiza un análisis diacrónico de la comunicación motriz en tres grupos de juegos y deportes tradicionales canarios ('juegos aborígenes', 'juegos tradicionales', y 'deportes tradicionales') para deducir pautas sociales que encierran estas prácticas. Se analizan y categorizan la red de comunicación motriz y la interacción motriz siguiendo criterios de la praxiología motriz. Bajo el significado del enfrentamiento como función lúdica principal, la estructura dualista se muestra de manera hegemónica, en detrimento de otras formas de comunicación motriz. También, se desvela que la diversificación de la interacción motriz del grupo 'juegos tradicionales' no es equivalente en los otros grupos estudiados, mostrando aquel grupo significados etnomotores hetereogéneos para una misma actividad. Las prácticas motrices estudiadas dan idea de la complejidad de la construcción de la tradición lúdica canariaA diachronic analysis of motor communication in three groups of traditional Canary Island games (‘aboriginal games’, ‘traditional games’, and ‘traditional sports’) was carried out in order to detect and define their social models. Both motor communication and motor interaction were analyzed and categorized according to motor praxeology criteria. When confrontation was the main function of the game, the dual structure was dominant over other forms of motor communication. The motor interaction diversification in the ‘traditional games’ group was not comparable to the other two groups due to the various ethno-motor modes used for the same activity. The motor study allows us to form an idea of the complexity of the construct of traditional Canary game

V centers in MgAl2O4 spinels

V centers induced by ionizing irradiation at 80 or 300 K in single-crystal and polycrystalline MgAl2O4 samples have been studied by use of electron paramagnetic resonance and optical absorption. Vt- and Vo2- centers, as a result of hole trapping at tetrahedral and octahedral cation vacancies, respectively, have been found to be responsible for two EPR bands centered at g=2.011 and optical absorption bands involved in the complex absorption spectrum at about 3.4 eV. These centers anneal thermally in a very wide step from 220 to 575 K. © 1991 The American Physical SocietyPeer Reviewe

Echelons of power series and Gabrielov's counterexample to nested linear Artin Approximation

Gabrielov's famous example for the failure of analytic Artin approximation in the presence of nested subring conditions is shown to be due to a growth phenomenon in standard basis computations for echelons, a generalization of the concept of ideals in power series rings.Comment: To appear in Bulletin of the London Mathematical Societ