Modulational instability windows in the nonlinear Schrödinger equation involving higher-order Kerr responses

We introduce a complete analytical and numerical study of the modulational instability process in a system governed by a canonical nonlinear Schrödinger equation involving local, arbitrary nonlinear responses to the applied field. In particular, our theory accounts for the recently proposed higher-order Kerr nonlinearities, providing very simple analytical criteria for the identification of multiple regimes of stability and instability of plane-wave solutions in such systems. Moreover, we discuss a new parametric regime in the higher-order Kerr response, which allows for the observation of several, alternating stability-instability windows defining a yet unexplored instability landscape.Xunta de Galicia | Ref. EM2013/00

Contribución al estudio de la ecología de las cigüeñas (Fam. Ciconiidae) en los llanos de Venezuela

Tesis Universidad Complutense de Madrid, Facultad de Ciencias Biológicas, Departamento de Biología Animal I (Zoología), leída el 08-03-1993Depto. de Biodiversidad, Ecología y EvoluciónFac. de Ciencias BiológicasTRUEpu

Modificaciones en los últimos escenarios sexuales, en los chicos

In the last decades, sexuality is one of the facets that raises more interest among evolutionary researchers. In this research the change occurred in the noncoital behavior that are analyzed in males, for a period of 10 years.  It took a very lengthy study, diachronic o transversal, with a trend over a sample of 2245 young university students (course 97-98) and 856 (course 07-08), in they were in their first and last year of their university course, in the University of Vigo. It was applied a structured survey, anonymous and voluntary, in which was the ages and variables were gathered, contemplating their noncoital behavior. The average age of university male, course 97-98, was of the ages 20-85 years old and the course 07-08, was of the ages 21-42 years old. The data was anaylzed using the statistical program SPSS 21.0.Analizamos  los cambios ocurridos en las últimas conductas coitales, en los hombres, durante un intervalo de 10 año, mediante un estudio longitudinal, diacrónico o transversal y de tendencia con una muestra de 2245 universitarios (curso 97-98) y 856 (07-08), que realizaban primero y último en la Universidad de Vigo. Se les aplicó una encuesta estructurada, anónima y voluntaria en la que se recogía la edad y variables sexuales, referidas a las últimas conductas coitales.  Los datos se analizan mediante el SPSS 21.0.  La edad media de las hombres universitarios, del curso 97-98, es de 20.85 años y la del curso 07-08, de 21.42 años. Las diferencias son significativa (p<.05) en cuanto a quienes iniciaron los coitos y edad, tiempo transcurrido desde el último coito, tipo de pareja sexual, satisfacción, por amor y deseo, el lugar donde aconteció, frecuencia coital, consumo etílico, uso de anticoncepción y elección de la misma

Variations of noncoital behavior of males

En esta investigación se analizan los cambios ocurridos en las últimas conductas no coitales, en los hombres, durante un intervalo de 10 años. Para ello se llevo a cabo un estudio longitudinal, diacrónico o transversal y de tendencia sobre una muestra de 2245 chicos universitarios (curso 97-98) y 856 (07-08), que realizaban el primer y último curso en la Universidad de Vigo. Se les aplicó una encuesta estructurada, anónima y voluntaria en la que se recogía la edad y variables sexuales, referidas a las conductas no coitales. La edad media de las hombres universitarios, del curso 97-98, es de 20.85 años y la del curso 07-08, de 21.42 años. Los datos se  analizaron mediante el programa estadístico SPSS 21.0.  Hay diferencias significativas (p<.05) entre ambos grupos en:  porcentaje de autoestimulación, frecuencia y edad de inicio, existencia de actividad sexual con otra persona, frecuencia de diferentes conductas sexuales no coitales y coitales y su edad de inicio.In the last decades, sexuality is one of the facets that raises more interest among evolutionary researchers. In this research the change occurred in the noncoital behavior that are analyzed in males, for a period of 10 years.  It took a very lengthy study, diachronic o transversal, with a trend over a sample of 2245 young university students (course 97-98) and 856 (course 07-08), in they were in their first and last year of their university course, in the University of Vigo. It was applied a structured survey, anonymous and voluntary, in which was the ages and variables were gathered, contemplating their noncoital behavior. The average age of university male, course 97-98, was of the ages 20-85 years old and the course 07-08, was of the ages 21-42 years old. The data was anaylzed using the statistical program SPSS 21.0

Corrosion resistance of a water-borne resin doped with graphene derivatives applied on galvanized steel

Financiado para publicación en acceso aberto: Universidade de Vigo/CISUGThe present work reports the effect of adding Graphene Oxide (GO) and reduced Graphene Oxide (rGO) in the corrosion protection provided by a water-borne resin applied on a galvanized steel substrate. Three concentrations, 0.05, 0.1 and 0.15 (all wt%) were tested. The results were markedly affected not only by the concentration of particles but also by their nature. Although the zeta potential values suggested good dispersibility of the particles in the resin, certain aggregation was observed, mainly in rGO 0.1 wt% and rGO 0.15 wt% formulations. The electrochemical impedance spectroscopy (EIS) technique characterised the free films' transport properties. The results suggested that the aggregation strongly influenced the film morphology. The rGO 0.1 wt% and rGO 0.15 wt% formulations exhibited percolating pores that facilitated the electrolyte uptake through the films. The EIS technique was also used to study the protective performance of the films when applied to the metallic substrate. The results confirmed the harmful effect of the particle's aggregation. The results were interesting for the rGO 0.05 wt% system, which displayed long-lasting protection properties. This performance was explained considering its good barrier properties and the zinc surface passivation by the generation of zincite, ZnO

Marginal changes at bone-level implants supporting fixed screw-retained partial implant prostheses with or without intermediate standardised abutments: 1-year results of a randomised controlled clinical trial

Objective: To compare marginal changes at bone- level implants restored with screw- retained implant prosthesis with or without intermediate standardised abutments, after 1 year of follow-up.Materials and Methods: Thirty- six partially edentulous patients received 72 implants. Each patient received 2 implants and a 2- to 4- unit screw- retained implant- prosthesis. The test group received implants consisting of a screw- retained prosthesis connected directly to the implant shoulder, while the prostheses in the control group were con-nected through a 3- mm standardised intermediate abutment. Clinical and radiological data were recorded at baseline and at 3, 6 and 12 months in follow-up visits.Results: At 12 months, the marginal bone loss was 0.17 ± 0.24 mm for the test group (19 patients) and 0.09 ± 0.15 mm for the control group (17 patients), with no statistically significant differences (p> .05). The mean probing pocket depth was 2.96 mm ± 0.46 for the test group and 2.86 ± 0.62 mm for the control group. The test and control groups showed bleeding on probing levels of 18.86 ± 14.12% and 13.73 ± 17.66%, re-spectively. All patients scored below 25% on the plaque index levels.Conclusions: Restoration of bone- level implants with fixed screw- retained partial prostheses with or without intermediate abutments presented similar radiographic and clinical outcomes after 1 yearS