Browsing by Issue Date, starting with "2007-02"
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- Expressionismo e teatroPublication . Vasques, EugéniaO drama expressionista apresenta-se, formalmente, como drama lírico, descontínuo, fragmentado, recorrendo à alegorização sintética, à metonímia, à sinédoque e hipálage, traduzindo, numa espécie de mimodrama falado, a visão trágica do mundo. Mas esta dramaturgia por vezes epidíctica (isto é, que mostra), elocutória e apostrofante na sua variedade formal, veicula a ideia central do Expressionismo: um drama do grito ou Schreidrama.
- Demixing instability in coil-rod blends undergoing polycondensation reactionsPublication . Teixeira, PauloThe authors extend their earlier work on the stability of a reacting binary polymer blend with respect to demixing [D. J. Read, Macromolecules 31, 899 (1998); P. I. C. Teixeira , Macromolecules 33, 387 (2000)] to the case where one of the polymers is rod-like and may order nematically. As before, the authors combine the random phase approximation for the free energy with a Markov chain model for the chemistry to obtain the spinodal as a function of the relevant degrees of reaction. These are then calculated by assuming a simple second-order chemical kinetics. Results are presented, for linear systems, which illustrate the effects of varying the proportion of coils and rods, their relative sizes, and the strength of the nematic interaction between the rods. (c) 2007 American Institute of Physics.
- A new bridge between leptonic CP violation and leptogenesisPublication . Branco, G. C.; Felipe, Ricardo Gonzalez; Joaquim, F. R.Flavour effects due to lepton interactions in the early Universe may have played an important role in the generation of the cosmological baryon asymmetry through leptogenesis. If the only source of high-energy CP violation comes from the left-handed leptonic sector, then it is possible to establish a bridge between flavoured leptogenesis and low-energy leptonic CP violation. We explore this connection taking into account our present knowledge about low-energy neutrino parameters and the matter-antimatter asymmetry observed in the Universe. In this framework, we find that leptogenesis favours a hierarchical light neutrino mass spectrum, while for quasi-degenerate and inverted hierarchical neutrino masses there is a very narrow allowed window. The absolute neutrino mass scale turns out to be m less than or similar to 0.1 eV. (c) 2007 Elsevier B.V. All rights reserved.