Handbook of instrumental techniques for materials, chemical and biosciences research

This Handbook contains a collection of articles describing instrumental techniques used for Materials, Chemical and Biosciences research that are available at the Scientific and Technological Centers of theUniversity of Barcelona (CCiTUB). The CCiTUB are a group of facilities of the UB that provide both the research community and industry with ready access to a wide range of major instrumentation.Together with the latest equipment and technology, the CCiTUB provide expertise in addressing the methodological research needs of the user community and they also collaborate in R+D+i Projectswith industry. CCiTUB specialists include technical and Ph.D.-level professional staff members who are actively engaged in methodological research. Detailed information on the centers’ resources andactivities can be found at the CCiTUB website www.ccit.ub.edu ...

The ViRVIG Institute

In this paper we present the ViRVIG Institute, a recently created institution that joins two well-known research groups: MOVING in Barcelona, and GGG in Girona. Our main research topics are Virtual Reality devices and interaction techniques, complex data models, realistic materials and lighting, geometry processing, and medical image visualization. We briefly introduce the history of both research groups and present some representative projects. Finally, we sketch our lines for future research

Materials ecobioconstructius sostenibles

Sobre materials ecobioconstructius sostenibles

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.

Educació virtual : Els dispositius mòbils com a eina d'ensenyament-aprenentatge

Aquest treball pretén aprofundir en com es poden aprofitar les noves eines tecnològiques per millorar l'entorn educatiu. Analitzarem de quina manera els dispositius mòbils poden ajudar a incrementar la motivació, la curiositat i la cooperació dels alumnes i, en definitiva, l'aprentatge.

Materials and supplementary materials used to teach vocabulary in the English class

This study is based on the analysis of the use of supplementary materials to teach vocabulary by second language teachers in Primary Education. The study consists of two analyses: the first one is a quantitative analysis based on 33 questionnaires answered by different second language teachers of Primary Education. The other, is a qualitative analysis in which the teacher’s subjective opinion on vocabulary learning techniques is presented. The study covers these main aspects: material use, effectiveness, children’s motivation, main criteria to teach vocabulary and the children’s role in their vocabulary learning.

La gestión de los libros electrónicos en la Biblioteca Virtual de la UOC

El texto que se presenta muestra cómo se lleva a cabo la gestión de los libros electrónicos en la Biblioteca Virtual (en adelante BV) de la Universitat Oberta de Catalunya (en adelante UOC). La BV pone especial énfasis en la adquisición de libros digitales para mejorar el acceso de los usuarios a los recursos y a lascolecciones de una universidad caracterizada por su virtualidad. El documento presenta, en primer lugar, el entorno en el que se adquieren y se utilizan los libros electrónicos: se describen los distintos escenarios de adquisición en los que se puede encontrar la BV y se definen los circuitos internos que permiten su gestión, así como los procesos técnicos de los documentos. A continuación, se muestran las distintas opciones de acceso y consulta de libros electrónicos que actualmente se ofrecen desde la BV y se exponenlos análisis de uso de dichos documentos. Por último, se presentan las conclusiones a las que llega la BV sobre el nuevo contexto de libros electrónicos.

Els nous materials s'inspiren en taurons i flors

Els nous materials sintètics, els més revolucionaris, s"inspiraran en la natura, capaç de crear per ella mateixa estructures amb propietats úniques

Programari de consulta offline al campus virtual de la UOC

L'objectiu del projecte és el desenvolupament d'una aplicació d'escriptori que permeti a l'estudiant la consulta offline de les darreres novetats disponibles a les aules del campus UOC. Es tracta d'automatitzar el procés de consulta i descàrrega local de dades per tal de poder consultar-les posteriorment fora de línia.

Projecte de botiga virtual de XsysPC

El projecte es basa en el desenvolupament d'una aplicació web per a la companyia fictícia XsysPC que ha decidit oferir la venta per Internet dels productes que tenen en les seves botigues, tals com ordinadors, components informàtics, perifèrics i altres.

Selective ablation of photovoltaic materials with UV laser sources for monolithic interconnection of devices based on a-Si:H

Lasers are essential tools for cell isolation and monolithic interconnection in thin-film-silicon photovoltaic technologies. Laser ablation of transparent conductive oxides (TCOs), amorphous silicon structures and back contact removal are standard processes in industry for monolithic device interconnection. However, material ablation with minimum debris and small heat affected zone is one of the main difficulty is to achieve, to reduce costs and to improve device efficiency. In this paper we present recent results in laser ablation of photovoltaic materials using excimer and UV wavelengths of diode-pumped solid-state (DPSS) laser sources. We discuss results concerning UV ablation of different TCO and thin-film silicon (a-Si:H and nc-Si:H), focussing our study on ablation threshold measurements and process-quality assessment using advanced optical microscopy techniques. In that way we show the advantages of using UV wavelengths for minimizing the characteristic material thermal affection of laser irradiation in the ns regime at higher wavelengths. Additionally we include preliminary results of selective ablation of film on film structures irradiating from the film side (direct writing configuration) including the problem of selective ablation of ZnO films on a-Si:H layers. In that way we demonstrate the potential use of UV wavelengths of fully commercial laser sources as an alternative to standard backscribing process in device fabrication.

Projecte de botiga virtual de XsysPC

El projecte es basa en el desenvolupament d'una aplicació web per a la companyia fictícia XsysPC que ha decidit oferir la venta per Internet dels productes que tenen en les seves botigues, tals com ordinadors, components informàtics, perifèrics i altres.