Nonlinear Optical Waveguides in LiNbO3 and Periodically Poled LiNbO3

Tesis Doctoral inédita de la Universidad Autónoma de Madrid. Facultad de Ciencias, Departamento de Física de Materiales. Fecha de lectura: 19-06-200

Proyecto de construcción de la variante de Torrecera en la CA-3110, Jerez de la Frontera (Cádiz)

Con este nuevo vial se pretende mejorar la seguridad vial y la calidad de vida de los vecinos de Torrecera, al disminuir el nivel de ruido, humos y sentimiento de peligrosidad en el casco urbano

Environmentally Friendly Thermoelectric Materials: High Performance from Inorganic Components with Low Toxicity and Abundance in the Earth

This review article gives an overview of the recent research directions in eco-friendly, non-toxic, and earth-abundant thermoelectric materials. It covers materials such as sulfides, tetrahedrites, earth-abundant oxides, silicides, copper iodine, Half-Heusler intermetallic compounds, nitrides, and other environmentally friendly thermoelectrics. In all cases, their history, structure, general characteristics, thermoelectric properties, synthesis methods, and related thermoelectric applications are compiled. It is also shown that they are starting to be an excellent alternative for producing cost-effective, sustainable, and non-toxic thermoelectric generators. This review does not try to include all possible materials, but to show that there are high zT thermoelectric materials that are starting to be an excellent alternative for producing cost-effective, sustainable, and non-toxic thermoelectric generators.O.C.-C. and M.M.-G. would like to acknowledge financial support from MAT2017-86450-C4-3-R and the 2D_MESES project from CSIC, and J.R.A., from RTI2018-099794-B-I100

Propuesta de contenidos para la enseñanza de la gestión de calidad de la información

La creciente necesidad de profesionales cualificados que acometan tareas relacionadas con el aseguramiento y gestión de la calidad de los datos y de la información, hacen conveniente complementar el perfil de Sistemas de Información de los estudios de Ingeniería en Informática con la introducción de nuevas asignaturas que traten este tema. Este artículo trata sobre una propuesta de posibles contenidos para una asignatura optativa específica de Gestión de Calidad de Datos y de Información, así como una estructuración para su impartición, adaptada a las directrices del Espacio Europeo de Educación Superior (EEES) con planificación docente ECTS. Este tipo de docencia reglada ya se imparte en países como Estados Unidos o Alemania, donde la sociedad y las organizaciones están concienciadas de los problemas ocasionados por niveles inadecuados de calidad de datos.Peer Reviewe

Silicon‐Germanium (SiGe) Nanostructures for Thermoelectric Devices: Recent Advances and New Approaches to High Thermoelectric Efficiency

Silicon and germanium present distinct and interesting transport properties. However, composites made of silicon‐germanium (SiGe) have resulted in a breakthrough in terms of their transport properties. Currently, these alloys are used in different applications, such as microelectronic devices and integrated circuits, photovoltaic cells, and thermoelectric applications. With respect to thermoelectricity, in the last decades, Si0.8Ge0.2 has attracted significant attention as an energy harvesting material, for powering space applications and other industrial applications. This chapter focuses on the recent advances and new approaches in silicon‐germanium (Si1−xGex) nanostructures for thermoelectric devices with high thermoelectric efficiency obtained through magnetron sputtering

Ordered three-dimensional interconnected nanoarchitectures in anodic porous ​alumina

Three-dimensional (3D) nanostructures combine properties of nanoscale materials with the advantages of being macro-sized pieces when the time comes to manipulate, measure their properties or make a device. However, the amount of compounds with the ability to self-organize in ordered 3D nanostructures is limited. Therefore, template-based fabrication strategies become the key approach towards 3D nanostructures. Here we report the simple fabrication of a template based on anodic ¿aluminium oxide, having a well-defined, ordered, tunable, homogeneous 3D nanotubular network in the sub 100-nm range. The 3D templates are then employed to achieve 3D, ordered nanowire networks in ¿Bi2Te3 and polystyrene. Finally, we demonstrate the photonic crystal behaviour of both the template and the polystyrene 3D nanostructure. Our approach may establish the foundations for future high-throughput, cheap, photonic materials and devices made of simple commodity plastics, metals and semiconductors.We would like to acknowledge financial support from ERC 2008 Starting Grant ‘Nano-TEC’ number 240497.Peer Reviewe

Propuesta de contenidos para la enseñanza de la Gestión de Calidad de la Información

La creciente necesidad de profesionales cualificados que acometan tareas relacionadas con el aseguramiento y gestión de la calidad de los datos y de la información, hacen conveniente complementar el perfil de Sistemas de Información de los estudios de Ingeniería en Informática con la introducción de nuevas asignaturas que traten este tema. Este artículo trata sobre una propuesta de posibles contenidos para una asignatura optativa específica de Gestión de Calidad de Datos y de Información, así como una estructuración para su impartición, adaptada a las directrices del Espacio Europeo de Educación Superior (EEES) con planificación docente ECTS. Este tipo de docencia reglada ya se imparte en países como Estados Unidos o Alemania, donde la sociedad y las organizaciones están concienciadas de los problemas ocasionados por niveles inadecuados de calidad de datos

Advances in Scanning Thermal Microscopy Measurements for Thin Films

One of the main challenges nowadays concerning nanostructured materials is the understanding of the heat transfer mechanisms, which are of the utmost relevance for many specific applications. There are different methods to characterize thermal conductivity at the nanoscale and in films, but in most cases, metrology, good resolution, fast time acquisition, and sample preparation are the issues. In this chapter, we will discuss one of the most fascinating techniques used for thermal characterization, the scanning thermal microscopy (SThM), which can provide simultaneously topographic and thermal information of the samples under study with nanometer resolution and with virtually no sample preparation needed. This method is based on using a nanothermometer, which can also be used as heater element, integrated into an atomic force microscope (AFM) cantilever. The chapter will start with a historical introduction of the technique, followed by the different kinds of probes and operation modes that can be used. Then, some of the equations and heating models used to extract the thermal conductivity from these measurements will be briefly discussed. Finally, different examples of actual measurements performed on films will be shown. Most of these results deal with thermoelectric thin films, where the thermal conductivity characterization is one of the most important parameters to optimize their performance for real applications

Cylindrical Three-Dimensional Porous Anodic Alumina Networks

The synthesis of a conformal three-dimensional nanostructure based on porous anodic alumina with transversal nanopores on wires is herein presented. The resulting three-dimensional network exhibits the same nanostructure as that obtained on planar geometries, but with a macroscopic cylindrical geometry. The morphological analysis of the nanostructure revealed the effects of the initial defects on the aluminum surface and the mechanical strains on the integrity of the three-dimensional network. The results evidence the feasibility of obtaining 3D porous anodic alumina on non-planar aluminum substrates.The European Research Council and the EU-H2020 program are gratefully acknowledged for co-funding this work through the projects Tonality (ERC-2014-PoC) and Marie Skłodowska-Curie Fellow (706094–TONSOPS). We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI)