165 resultados para 05-Yak-01
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An accurate mass formula at finite temperature has been used to obtain a more precise estimation of temperature effects on fission barriers calculated within the liquid drop model.
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The antikaon optical potential in hot and dense nuclear matter is studied within the framework of a coupled-channel self-consistent calculation taking, as bare meson-baryon interaction, the meson-exchange potential of the Jlich group. Typical conditions found in heavy-ion collisions at GSI are explored. As in the case of zero temperature, the angular momentum components larger than L=0 contribute significantly to the finite temperature antikaon optical potential at finite momentum. It is found that the particular treatment of the medium effects has a strong influence on the behavior of the antikaon potential with temperature. Our self-consistent model, in which antikaons and pions are dressed in the medium, gives a moderately temperature dependent antikaon potential which remains attractive at GSI temperatures, contrary to what one finds if only nuclear Pauli blocking effects are included.
Magnetic relaxation and quantum tunneling of vortices in polycristalline Hg0.8Tl0.2Ba2Ca2Cu3O8+sigma
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En el present treball, es descriuen tres arquetips d'inversors: l'inversor motivat per l'optimització del seu risc, l'inversor amb esperit d'empresa i l'inversor especulador i intuïtiu, també anomenat irracional. Aquestes modalitats d'inversió es troben presents en el mercat de valors i es poden analitzar i sistematitzar teòricament. El predomini d'aquestes modalitats d'inversió varia segons les èpoques. La bombolla financera és un exemple de predomini de l'inversor irracional i especulatiu. Al final de l'article es mostra com J.M.Keynes va anticipar cada una d'aquestes modalitats d'inversió.
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A new subspecies of Pedicularis pyrenaica J. Gay (Scrophulariaceae) in Central Pyrenees. We describe a new subspecies of Pedicularis pyrenaica (P. pyrenaica subsp. praetermissa) from the Central Pyrenees, which differs from the typical in the shape of the upper lip of the corolla (fusiform, attenuated in a conical beak), as for the larger size of the corolla and the whole plant. We add several comments on the morphological characterization and the habitat of the plant in relation to close taxa
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En aquest article es revisen els components de la fertilitat dels sòls mediterramis i es discuteix les seves característiques generals, així com la suposada oligotrofia que sovint se'ls ha atribuït. La tipologia d'aquests sòls i els cicles del N i P presenten alguns trets comuns que vénen determinats per trobar-se en n règim de clima mediterrani, tanmateix existeixen diferències remarcables que es relacionen, sobretot, amb el tipus de roca mare i que expliquen les diferències sovint atribuïdes als sòls de les cinc regions mediterrànies
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The diversity of lichens of Catalonia and Andorra. The state of the question and proposals to complete our knowledge. After a selection of bibliographical sources, the authors analyse the current level of the knowledge of the lichenic flora of Catalonia and Andorra. Having in mind this situation, they propose some objectives aimed to an optimum field research, as a first step towards a balanced and reasonably complete knowledge of the lichenic biodiversity of the area
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Podeu consultar l'Informe complet a: http://hdl.handle.net/2445/23662
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Podeu consultar l'Informe complet a: http://hdl.handle.net/2445/23662
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Podeu consultar l'Informe complet a: http://hdl.handle.net/2445/23662
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Podeu consultar l'Informe complet a: http://hdl.handle.net/2445/23667
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Podeu consultar l'Informe complet a: http://hdl.handle.net/2445/23667