Self-dual Chern-Simons solitons in noncommutative space

We construct exact soliton solutions to the Chern-Simons-Higgs system in noncommutative space, for non-relativistic and relativistic models. In both cases we find regular vortex-like solutions to the BPS equations which approach the ordinary selfdual non-topological and topological solitons when the noncommutative parameter $\theta$ goes to zero.Comment: 15 pages, 4 figure

Particle-vortex dynamics in noncommutative space

We study the problem of a charged particle in the presence of a uniform magnetic field plus a vortex in noncommutative planar space considering the two possible non-commutative extensions of the corresponding Hamiltonian, namely the ``fundamental'' and the ``antifundamental'' representations. Using a Fock space formalism we construct eigenfunctions and eigenvalues finding in each case half of the states existing in the ordinary space case. In the limit of $\theta \to 0$ we recover the two classes of states found in ordinary space, relevant for the study of anyon physics.Comment: 13 pages, no figures, plain LaTeX. References adde

Numerical integration of the stochastic Landau-Lifshitz-Gilbert equation in generic time-discretisation schemes

We introduce a numerical method to integrate the stochastic Landau-Lifshitz-Gilbert equation in spherical coordinates for generic discretization schemes. This method conserves the magnetization modulus and ensures the approach to equilibrium under the expected conditions. We test the algorithm on a benchmark problem: the dynamics of a uniformly magnetized ellipsoid. We investigate the influence of various parameters, and in particular, we analyze the efficiency of the numerical integration, in terms of the number of steps needed to reach a chosen long time with a given accuracy.Comment: 9 pages and 7 figure

Estrategias de marca en los vinos de calidad : referencia al caso español

[Resumen]: El sector vitivinícola es maduro y competitivo, lo que obliga a las empresas a buscar soluciones basadas en la diferenciación de la oferta. Una estrategia utilizada para conseguir ventajas competitivas y lograr dicha diferenciación es la creación de marcas fuertes. En el sector vitivinícola español conviven numerosas marcas, pero existe el fenómeno de carencia de marcas sólidas. Además, hay muchas empresas con un volumen de producción pequeño que no disponen de recursos financieros suficientes para realizar políticas de marca. Este trabajo de investigación analiza, bajo el enfoque teórico del valor de marca, la importancia que la denominación de origen y las marcas juegan dentro del sector vitivinícola. El objetivo que pretendemos probar es si la denominación de origen se presenta como una marca colectiva que tendrá tanto más importancia cuanto más pequeño sea el volumen de producción de la empresa y que la creación de marcas fuertes mejora la posición competitiva de la empresa. Para comprobar si se cumple este objetivo hemos realizado una encuesta dirigida a los empresarios de las bodegas de vinos de calidad de las denominaciones de origen más importantes del sector vitivinícola.[Abstract]: The wine sector is mature and competitive, what forces to the companies to look for solutions based on the differentiation strategy. A strategy used to get competitive advantages and to achieve this differentiation is the creation of strong brands. A great number of brands coexist in the Spanish wine sector, but there aren´t strong brands. Furthermore, there are many companies with a small production volume without financial resources to carry out brand management. This investigation work analyzes, under the theoretical focus of the brand equity, the importance that the country of origin and the brands plays inside the wine sector. The objective that we seek to prove is if the country of origin is presented like an collective branding that will have more importance the more small it is the volume of production of the company and that the creation of strong brands improvement the competitive position of the company. To prove this objective we have carried out a survey directed to the managers of the cellars of quality wines of the most important appellations of origin in the wine secto