5,472 research outputs found
The challenge of umbelief and religious indifference
La fe cristiana, en general, en personas antes tradicionalmente católicas, se ha difuminado o se ha olvidado la práctica y la vida cristianas. Naciones enteras, antes de fuerte raigambre cristiana, necesitan ser recristianizadas. Intranquiliza el secularismo imperante; la confusión doctrinal en temas religiosos; las informaciones malsanas o las defromaciones dañinas en cuestiones sobre la moral y las buenas costumbres cristianas; la reticencia en negar, en la vida y en los hechos, cualquier referencia a la verdad relacionada con las cuestiones más fundamentales de la persona humana: Dios-hombre, cosmos; considerar el hombre como centro y fin, árbitro y juez al margen de la ley natural y de la ley divina positiva; creer y presuponer que sólo la ciencia y la técnica son los únicos medios eficaces para el bienestar del hombre. ¿Que causas y factores han conseguido crear este estado delicuescente de pensar que se puede vivir sin la inquebrantable creencias en Dios y hacer caso omiso, enfáticamente, de uss promesasde salvación?, ¿Cómo se ha llegado a tales actitudes de increencia e indiferencia?
Unusual magneto-transport of YBa2Cu3O7-d films due to the interplay of anisotropy, random disorder and nanoscale periodic pinning
We study the general problem of a manifold of interacting elastic lines whose
spatial correlations are strongly affected by the competition between random
and ordered pinning. This is done through magneto-transport experiments with
YBa2Cu3O7-d thin films that contain a periodic vortex pinning array created via
masked ion irradiation, in addition to the native random pinning. The strong
field-matching effects we observe suggest the prevalence of periodic pinning,
and indicate that at the matching field each vortex line is bound to an
artificial pinning site. However, the vortex-glass transition dimensionality,
quasi-2D instead of the usual 3D, evidences reduced vortex-glass correlations
along the vortex line. This is also supported by an unusual angular dependence
of the magneto-resistance, which greatly differs from that of Bose-glass
systems. A quantitative analysis of the angular magnetoresistance allows us to
link this behaviour to the enhancement of the system anisotropy, a collateral
effect of the ion irradiation
Immigració estrangera a Catalunya des d'una perspectiva local: Reus, segles XVI-XX
Anàlisi de la presència d'estrangers europeus a la ciutat de Reus, centre econòmic del
sud de Catalunya i proper a la costa del Mediterrani, a través de llibres parroquials i padrons
municipals.
En el segle XVI destaca l'allau d'occitans (França) i en el segle XVIII la diversitat és més gran
a causa de l'increment dels intercanvis comercials amb el nord d'Europa (venda d'aiguardent
i fruita seca i compra de pesca salada i fusta per a bótes). Altres moments d'elevada mobilitat
són les diferents guerres, en especial les internacionals.Analysis of the presence of European foreigners in the city of Reus (economic center of
the south of Catalonia near to the Mediterranean coast) through parish books and municipal
censuses. It is remarkable the avalanche of Occitan people (from France) during the 16th century.
During the 18th century there is more variety, because of the increase in the commercial
exchanges with the north of Europe (liquor and dried fruit sales, and purchases of salty fish
and wood to make barrels). Other periods with high mobility are the different wars, specially
the international ones
Confinement and Quantization Effects in Mesoscopic Superconducting Structures
We have studied quantization and confinement effects in nanostructured
superconductors. Three different types of nanostructured samples were
investigated: individual structures (line, loop, dot), 1-dimensional (1D)
clusters of loops and 2D clusters of antidots, and finally large lattices of
antidots. Hereby, a crossover from individual elementary "plaquettes", via
clusters, to huge arrays of these elements, is realized. The main idea of our
study was to vary the boundary conditions for confinement of the
superconducting condensate by taking samples of different topology and, through
that, modifying the lowest Landau level E_LLL(H). Since the critical
temperature versus applied magnetic field T_c(H) is, in fact, E_LLL(H) measured
in temperature units, it is varied as well when the sample topology is changed
through nanostructuring. We demonstrate that in all studied nanostructured
superconductors the shape of the T_c(H) phase boundary is determined by the
confinement topology in a unique way.Comment: 28 pages, 19 EPS figures, uses LaTeX's aipproc.sty, contribution to
Euroschool on "Superconductivity in Networks and Mesoscopic Systems", held in
Siena, Italy (8-20 september 1997
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