El Sueco (reed. de 1911) : periòdic de corfa y molla y ensisam de totes herbes... per D. Chusep Bernat i Baldoví y D. Pascual Pérez Rodríguez: Número 9 - Diumenche 31 octubre de 1847

Microfilme. Valencia: BV, ca 1990

El Sueco (reed. de 1911) : periòdic de corfa y molla y ensisam de totes herbes... per D. Chusep Bernat i Baldoví y D. Pascual Pérez Rodríguez: Número 10 - Diumenche 7 de novembre 1847

Microfilme. Valencia: BV, ca 1990

El Sueco (reed. de 1911) : periòdic de corfa y molla y ensisam de totes herbes... per D. Chusep Bernat i Baldoví y D. Pascual Pérez Rodríguez: Número 11 - Diumenche 7 de novembre 1847

Microfilme. Valencia: BV, ca 1990

El Sueco (reed. de 1911) : periòdic de corfa y molla y ensisam de totes herbes... per D. Chusep Bernat i Baldoví y D. Pascual Pérez Rodríguez: Número 12 - Diumenche 21 de novembre 1847

Microfilme. Valencia: BV, ca 1990

El Sueco (reed. de 1911) : periòdic de corfa y molla y ensisam de totes herbes... per D. Chusep Bernat i Baldoví y D. Pascual Pérez Rodríguez: Número 13 - Diumenche 28 de novembre 1847

Microfilme. Valencia: BV, ca 1990

Ensenyar i aprendre literatura en contextos digitals: reptes i necessitats didàctiques

En aquest article es presenta una perspectiva del desenvolupament de la tecnologia al servei de l'ensenyament. El docent del segle XXI ha d'acomplir amb objectius cognitius, metodològics i tecnològics per a abastir el seu alumnat dins dels paràmetres de competència curricular, com també els instrumentals. La generació que està a les nostres aules són usuaris i gestors d'una societat en què estan consolidant habilitats i coneixements transversals que han de formar-se a l'escola tant com ho fan a l'àmbit domèstic.

Sobre la medalla a Godoy de la Real Sociedad Económica de Amigos del País de Valencia acuñada en 1807. Documentos inéditos

Entre los documentos del archivo de la Real Sociedad Econó-mica de Amigos del País de Valencia (RSEAPV)1, se encuentra un con-junto muy interesante concerniente a la realización de una medalla por parte de esta sociedad en honor de Manuel Godoy, Príncipe de la Paz. Es en enero de 1807 cuando la RSEAPV decide nombrarlo miembro protector de esa Real Sociedad y, en agradecimiento a su aceptación y su reciente nombramiento al Grande Almirantazgo de España e Yndias, acuña la medalla sobre la cual presento este trabajo. El estudio detallado de los citados documentos nos permitirá ir más allá de las imágenes re-presentadas en el reverso de la misma, proporcionándonos su correcta interpretación dentro del contexto histórico del momento.

Las comunidades del orden Molinietalia caeruleae en los Pirineos

Revisión y breve comentario de las diferentes asociaciones y subasociaciones del orden Molinietalia caeruleae reconocidas hasta ahora en los Pirineos catalanes. Se hace referencia a 10 asociaciones distintas, correspondientes a las alianzas Filipendulion (1 asociación), Calthion palustris (3 asociaciones), Juncion acutiflori (2) y Molinion caeruleae (4), dos de las cuales -Carici (pallescentis)-Molinietum y Epipactidi-Molinietum- se proponen aquí como nuevas. Una tabla sintética en la que figuran, para cada especie, los tantos por ciento de presencia y los coeficientes dc recubrimiento, resume la composición floristica de las d¡versas comunidades.

La vegetación de la clase Epilobietea angustifolii

Dentro de la vegetación de los claros de bosques húmedos (clase Epilobietea angustifolii) en los Pirineos catalanes distinguimos básicamente tres asociaciones: Epilobietum montani-angustifolii as. nova, ampliamente extendida por todo el territorio, aunque a menudo bastante pobre floristicamente; Atropetum belladonnae (Br.-Bl. 1930) Tx. 1950, más bien esporádica y a menudo fragmentaria, y Sambuco-Rubetum idaei O. de Bolós 1979, dentro del que se reconocen dos subasociaciones, rubetosum glandulosi (= typicum), limitada a los valles más occidentales y de carácter más o menos atlántico, y rubetosum idaei nova, de área más general y de ambientes relativamente secos.

Magnetic-field dependence of hole levels in self-assembled InGaAs quantum dots

Recent magnetotransport experiments of holes in InGaAs quantum dots [D. Reuter, P. Kailuweit, A. D. Wieck, U. Zeitler, O. Wibbelhoff, C. Meier, A. Lorke, and J. C. Maan, Phys. Rev. Lett. 94, 026808 (2005)] are interpreted by employing a multiband k¿p Hamiltonian, which considers the interaction between heavy hole and light hole subbands explicitly. No need of invoking an incomplete energy shell filling is required within this model. The crucial role we ascribe to the heavy hole-light hole interaction is further supported by one-band local-spin-density functional calculations, which show that Coulomb interactions do not induce any incomplete hole shell filling and therefore cannot account for the experimental magnetic field dispersion.

Electronic structure of few-electron concentric double quantum rings

The ground state structure of few-electron concentric double quantum rings is investigated within the local spin density approximation. Signatures of inter-ring coupling in the addition energy spectrum are identified and discussed. We show that the electronic configurations in these structures can be greatly modulated by the inter-ring distance: At short and long distances the low-lying electron states localize in the inner and outer rings, respectively, and the energy structure is essentially that of an isolated single quantum ring. However, at intermediate distances the electron states localized in the inner and the outer ring become quasidegenerate and a rather entangled, strongly-correlated system is formed.

Vertically coupled double quantum rings at zero magnetic field

Within local-spin-density functional theory, we have investigated the ¿dissociation¿ of few-electron circular vertical semiconductor double quantum ring artificial molecules at zero magnetic field as a function of interring distance. In a first step, the molecules are constituted by two identical quantum rings. When the rings are quantum mechanically strongly coupled, the electronic states are substantially delocalized, and the addition energy spectra of the artificial molecule resemble those of a single quantum ring in the few-electron limit. When the rings are quantum mechanically weakly coupled, the electronic states in the molecule are substantially localized in one ring or the other, although the rings can be electrostatically coupled. The effect of a slight mismatch introduced in the molecules from nominally identical quantum wells, or from changes in the inner radius of the constituent rings, induces localization by offsetting the energy levels in the quantum rings. This plays a crucial role in the appearance of the addition spectra as a function of coupling strength particularly in the weak coupling limit.

Role of structural saturation and geometry in the luminescence of silicon-based nanostructured materials

The structural saturation and stability, the energy gap, and the density of states of a series of small, silicon-based clusters have been studied by means of the PM3 and some ab initio (HF/6-31G* and 6-311++G**, CIS/6-31G* and MP2/6-31G*) calculations. It is shown that in order to maintain a stable nanometric and tetrahedral silicon crystallite and remove the gap states, the saturation atom or species such as H, F, Cl, OH, O, or N is necessary, and that both the cluster size and the surface species affect the energetic distribution of the density of states. This research suggests that the visible luminescence in the silicon-based nanostructured material essentially arises from the nanometric and crystalline silicon domains but is affected and protected by the surface species, and we have thus linked most of the proposed mechanisms of luminescence for the porous silicon, e.g., the quantum confinement effect due to the cluster size and the effect of Si-based surface complexes.

Magnetoresistance at artificial interfaces in the itinerant SrRuO3 ferromagnet

The magnetoresistance across interfaces in the itinerant ferromagnetic oxide SrRuO3 have been studied. To define appropriately the interfaces, epitaxial thin films have been grown on bicrystalline and laser-patterned SrTiO3 substrates. Comparison is made with results obtained on similar experiments using the double-exchange ferromagnetic oxide La2/3Sr1/3MnO3. It is found that in SrRuO3, interfaces induce a substantial negative magnetoresistance, although no traces of the low-field spin tunneling magnetoresistance are found. We discuss these results on the basis of the distinct degree of spin polarization in ruthenates and manganites and the different nature of the surface magnetic layer formed at interfaces.