Ultra-high, broadband gain in a lattice-engineered, Yb-doped double tungstate channel waveguide

150 dB/cm gain over 55 nm wavelength range between 977-1032 nm is obtained in a 47.5% Yb-doped potassium double tungstate waveguide amplifier. The dependence of luminescence lifetime and gain on Yb concentration is investigated

Integración de las construcciones rurales en el paisaje: encuestas y conclusiones

Design and integration of rural buildings in landscape: surveys and conclusions. The visual and aesthetic aspect of any object is defined by its characteristics of colour, form, line and texture. Any elements of compositive reference such as its scale and spatial character could also be added. This research applies a new method for predicting the value of the integration of buildings into the landscape, based on psychological aspects and the capacities of modern computers that are able to analyse easily these attributes. The designer can analyse the visual elements, all of them divided and studied in the properties that define them

Buildings environmental impact assessment: simulation of textures

To study the construction as modifying of the environment and by so much as aesthetic attribute of the scene should know in what aspect influences. The physical resources of the landscape will be very seemed before and after the incorporation of a project (quality of content). Therefore they will be mainly the new composition of the elements (communicative quality) and the aesthetic resources (quality aesthetics) on those which will influence the constructions. The different points of view election will remain settled with the simulation by infographic photocomposition. The visual and aesthetic aspect of any object is defined by their characteristic of color, form, line and texture. It could be also added any elements of compositive reference as are its scale and being tried to stages, as is the case of the landscape, its spatial character. In this article we will center ourselves in one of these attributes: the texture. The different textures vision is crucial in the communication. The simulation of the landscapte has suffered a great impulse with the treatment of the photograph. This method admits various alternatives. It can be analyzed the taken image of the reality such which, or deducting some of its parts, adding some other element originating from the same or of other scene, or including constructions designed in CAD. The great advance, for the investigation of the visual perception, is procured in the composition using the landscape as fund and a construcion created through a design program attended by ordering. This step supposes great alternatives variability and a rapid generation of the same. Settled the great problem to obtain to compatibilize the points of view of the panorama and of the superposed performance and climinated by photographic treatment the properties of the surfaces that tent to be smooth and metalized brilliants. The reflections and conclusions of the texture emerge with speed. They are analyzed in the study the different simulations with different textures

Spontaneous light emission in complex nanostructures

The spontaneous emission of an excited atom surrounded by different materials is studied in the framework of a semiclassical approach, where the transition dipole moment acts as the source of the emission field. The emission in the presence of semiinfinite media, metallic nanorings, spheres, gratings, and other complex geometries is investigated. Strong emission enhancement effects are obtained in some of these geometries associated to the excitation of plasmons (e.g., in nanorings or spheres). Furthermore, the emission is shown to take place only along narrow angular distributions when the atom is located inside a low-index dielectric and near its planar surface, or when metallic nanogratings are employed at certain resonant wave lengths. In particular, axially symmetric gratings made of real silver metal are considered, and both emission rate enhancement and focused far-field emission are achieved simultaneously when the grating is decorated with further nanostructures.This work has been supported in part by the Basque Departamento de Educacion, Universidades e Investigacion, the University of the Basque Country UPV/EHU (Contract No. 00206.215-13639/2001) and the Spanish Ministerio de Ciencia y Tecnologia (Contract No. MAT2001-0946).Peer reviewe

Experimental and theoretical cross sections for positron scattering from the pentane isomers

10 págs.; 8 figs.; 3 tabs.Isomerism is ubiquitous in chemistry, physics, and biology. In atomic and molecular physics, in particular, isomer effects are well known in electron-impact phenomena; however, very little is known for positron collisions. Here we report on a set of experimental and theoretical cross sections for low-energy positron scattering from the three structural isomers of pentane: normal-pentane, isopentane, and neopentane. Total cross sections for positron scattering from normal-pentane and isopentane were measured at the University of Trento at incident energies between 0.1 and 50 eV. Calculations of the total cross sections, integral cross sections for elastic scattering, positronium formation, and electronic excitations plus direct ionization, as well as elastic differential cross sections were computed for all three isomers between 1 and 1000 eV using the independent atom model with screening corrected additivity rule. No definitive evidence of a significant isomer effect in positron scattering from the pentane isomers appears to be present. ©2016 AIP Publishing LLCG.G. and F.B. would like to acknowledge the Spanish Ministerio de Economía y Productividad (Project No. FIS2012-31230) and the European Science Foundation (COST Action Grants Nos. MP1002–Nano-IBCT and MC1301-CELINA) for financial support. Finally, L.C. thanks the Japan Society for the Promotion of Science for his fellowship.Peer Reviewe

Las nuevas construcciones ante la conservación del paisaje tradicional: un acercamiento a su estudio en el Páramo Leonés

Los paisajes se encuentran salpicados de numerosas edificaciones que influyen en la visualización que se tiene de ellos. Las construcciones rurales son un tipo de edificio que, por sus dimensiones y localización, influyen notablemente en la apreciación estética de la escena. Es notoria la importancia creciente en nuestro país del paisaje como recurso natural y, por tanto, de las construcciones como factor que afecta a la belleza paisajística. La sociedad en general, y los técnicos y proyectistas en particular, deberían tener en cuenta que la elección de los materiales de construcción, el emplazamiento y las relaciones de texturas y colores son consideraciones primordiales para el diseño de edificios rurales. Son elementos que intervienen en la conservación de los ecosistemas y en la potenciación del turismo rural, una de las principales vías económicas para muchas regiones españolas

Las nuevas construcciones antes la conservación del paisaje: un acercamiento a su estudio. Caso particular del páramo leonés

El paisaje es un recurso natural que cada vez aparece considerado con mayor profusión en la redacción de proyectos, y que debe ser protegido y conservado ante la construcción de Intervenciones antrópicas. Por tanto, el impacto visual ha de ser estudiado como una parte primordial en los estudios generales de impacto ambiental. Las nuevas tecnologías deben contribuir a ello proporcionando herramientas informáticas que realicen simulaciones y reproducciones de la realidad con alto grado de fidelidad

Las nuevas construcciones antes la conservación del paisaje: un acercamiento a su estudio. Caso particular del páramo leonés

El paisaje es un recurso natural que cada vez aparece considerado con mayor profusión en la redacción de proyectos, y que debe ser protegido y conservado ante la construcción de Intervenciones antrópicas. Por tanto, el impacto visual ha de ser estudiado como una parte primordial en los estudios generales de impacto ambiental. Las nuevas tecnologías deben contribuir a ello proporcionando herramientas informáticas que realicen simulaciones y reproducciones de la realidad con alto grado de fidelidad

Rights of pasture: A strategy to conservare the extensive capríne breeds

Se plantea la utilización de los derechos de pastoreo como una estrategia de conservación de parques naturales, de la biodiversidad, así como de las economías y poblaciones asociadas. La creación de un "mercado de derechos" y la posterior asignación en base a los "derechos históricos" transforma a los ganaderos en gestores del medio ambiente, a la vez que posibilita la conservación de las razas autóctonas caprinas en peligro de extinción.It is proposed the use of the Rights of pasture like a strategy to conservate natural parks, biodiversity, as soon as connected economies and populations. The creation of a “Rights market” and the subsequent allotment on a basis of the “historical rights” transformes the cattles in environmental managers, while makes posible to conservate native carprine breds in extiction danger