Gd2O3: Eu3+/PPO/POPOP/PS composites for digital imaging radiation detectors

Polymer based scintillator composites have been produced by combining polystyrene (PS) and Gd2O3:Eu3+ scintillator nanoparticles. Polystyrene has been used since it is a flexible and stable binder matrix, resistant to thermal and light deterioration and with suitable optical properties. Gd2O3:Eu3+ has been selected as scintillator material due to its wide band gap, high density and visible light yield. The optical, thermal and electrical characteristics of the composites were studied as a function of filler content, together with their performance as scintillator material. Additionally 1wt.% of 2,5 dipheniloxazol (PPO) and 0.01wt.% of (1,4-bis(2-(5-phenioxazolil))-benzol (POPOP) were introduced in the polymer matrix in order to strongly improve light yield, i.e. the measured intensity of the output visible radiation, under X-ray irradiation. Whereas increasing scintillator filler concentration (from 0.25wt.% to 7.5wt.%) increases scintillator light yield, decreases the optical transparency of the composite. The addition of PPO and POPOP, strongly increased the overall 2 transduction performance of the composite due to specific absorption and re-emission processes. It is thus shown that Gd2O3:Eu3+/PPO/POPOP/PS composites in 0.25 wt.% of scintillator content with fluorescence molecules is suitable for the development of innovate large area X-ray radiation detectors with huge demand from the industries.

Combined Measurement of the Higgs Boson Mass in pp Collisions at root s=7 and 8 TeV with the ATLAS and CMS Experiments

A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H→γγ and H→ZZ→4ℓ decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is mH=125.09±0.21(stat.)±0.11(syst.) GeV.

Creació d'un CMS

Aquesta memòria tracta sobre el desenvolupament d'un gestor de continguts o CMS per tal de gestionar pàgines web de centres educatius d'una manera fàcil, ràpida i econòmica. Al llarg de la memòria s'explica l'estructura que segueixen tots els elements de la pàgina (base de dades, disseny web i scripts) així com els requeriments necessaris per dur a terme i gestionar el projecte correctament.

Development of advanced silicon radiation detectors for high energy physics and medical imaging

The 1st chapter of this work presents the different experiments and collaborations in which I am involved during my PhD studies of Physics. Following those descriptions, the 2nd chapter is dedicated to how the radiation affects the silicon sensors, as well as some experimental measurements carried out at CERN (Geneve, Schwitzerland) and IFIC (Valencia, Spain) laboratories. Besides the previous investigation results, this chapter includes the most recent scientific papers appeared in the latest RD50 (Research & Development #50) Status Report, published in January 2007, as well as some others published this year. The 3rd and 4th are dedicated to the simulation of the electrical behavior of solid state detectors. In chapter 3 are reported the results obtained for the illumination of edgeless detectors irradiated at different fluences, in the framework of the TOSTER Collaboration. The 4th chapter reports about simulation design, simulation and fabrication of a novel 3D detector developed at CNM for ions detection in the future ITER fusion reactor. This chapter will be extended with irradiation simulations and experimental measurements in my PhD Thesis.

E-learning : implementació d'un CMS per a la gestió d'un Campus Virtual

L'objectiu d'aquest treball consisteix a elegir una eina de gestió de continguts per a l'aplicació en la gestió d'un campus virtual. L'estudi de les característiques de diversos dels CMS més emprats ens permetrà, a més, acostar-nos-hi d'una manera pràctica, atès que una part del treball inclou, després de la tria del CMS, la seva instal·lació en un servidor a Internet i la configuració pertinent per a adequar-lo als rols d'administradors, professors, estudiants, etc.

Desarrollo de un portal web con el CMS DotNetNuke

Memoria, presentación en vídeo y producto desarrollado del trabajo/proyecto fin de Carrera de la titulación de Ingeniería en Informática, consistente en la realización de un portal web para una pyme ficticia de nombre VendetArte dedicada a la representación de artesanos. El portal web ha sido desarrollado con el gestor de contenidos (CMS) DotNetNuke que trabaja bajo plataforma .NET

Standardisation of 18F by a coincidence method using full solid angle detectors.

A solution of (18)F was standardised with a 4pibeta-4pigamma coincidence counting system in which the beta detector is a one-inch diameter cylindrical UPS89 plastic scintillator, positioned at the bottom of a well-type 5''x5'' NaI(Tl) gamma-ray detector. Almost full detection efficiency-which was varied downwards electronically-was achieved in the beta-channel. Aliquots of this (18)F solution were also measured using 4pigamma NaI(Tl) integral counting and Monte Carlo calculated efficiencies as well as the CIEMAT-NIST method. Secondary measurements of the same solution were also performed with an IG11 ionisation chamber whose equivalent activity is traceable to the Système International de Référence through the contribution IRA-METAS made to it in 2001; IRA's degree of equivalence was found to be close to the key comparison reference value (KCRV). The (18)F activity predicted by this coincidence system agrees closely with the ionisation chamber measurement and is compatible within one standard deviation of the other primary measurements. This work demonstrates that our new coincidence system can standardise short-lived radionuclides used in nuclear medicine.

Intercomparison of the response of different photon and neutron detectors around a spent fuel cask

An intercomparison of the response of different photon and neutron detectors was performed in several measurement positions around a spent fuel cask (type TN 12/2B) filled with 4 MOX and 8 UO2 15 x 15 PWR fuel assemblies at the nuclear power plant Gosgen (KKG) in Switzerland. The instruments used in the study were both active and passive, photon and neutron detectors calibrated either for ambient or personal dose equivalent. The aim of the measurement campaign was to compare the responses of the radiation instruments to routinely used detectors. It has been shown that especially the indications of the neutron detectors are strongly dependent on the neutron spectra around the cask due to their different energy responses. However, routinely used active photon and neutron detectors were shown to be reliable instruments. (C) 2012 Elsevier Ltd. All rights reserved.

Alarma d'incendis amb detectors sense fils

L'objectiu d'aquest treball de final de carrera és desenvolupar un sistema d'alarma contra incendis basat en tecnologia WSN (xarxa de sensors sense fils).

Anàlisi d'accessibilitat en entorns cms

El treball consisteix en l'avaluació d'accessibilitat de dos cms i la configuració dels mateixos perquè arribin a una versió el més accessible possible.

Web Mining Mineração de dados na Web utilizando CMS

Este trabalho foi realizado no âmbito do regulamento dos cursos de graduação da Universidade Jean Piaget de Cabo Verde, procura realçar a importância da recolha de dados na Web nos dias de hoje. Também apresenta um CMS (Sistema de Gestão de Conteúdo) utilizado no desenvolvimento de Websites, mostrando que é possível obter dados que podem ser considerados úteis acerca do acesso e utilização dos mesmos, dotando-os de componentes desenvolvidos para estes sistemas.

Parametrización de CMS para análisis sanguíneos

El proyecto ha consistido en la implantación de una web para DBSS, con doble finalidad: una pública de información general sobre la misma y otra privada para la automatización de la entrada de datos de análisis de sangre y su posterior consulta por parte del paciente. Se han seleccionado las tecnologías adecuadas tanto para el diseño de la web como de las bases de datos asociadas. Se han programado la web y las bases de datos con éxito y se ha realizado la implementación del sistema, realizándose pruebas de funcionamiento internas y externas con éxito, comprobándose la bondad de la aplicación.

Low noise pixel detectors based on gated geiger mode avalanche photodiodes

The gated operation is proposed as an effective method to reduce the noise in pixel detectors based on Geiger mode avalanche photodiodes. A prototype with the sensor and the front-end electronics monolithically integrated has been fabricated with a conventional HV-CMOS process. Experimental results demonstrate the increase of the dynamic range of the sensor by applying this technique.

Impedance field and transition from thermal to shot noise in Cd1-xZnxTe semi-insulating Ohmic detectors

Within a drift-diffusion model we investigate the role of the self-consistent electric field in determining the impedance field of a macroscopic Ohmic (linear) resistor made by a compensated semi-insulating semiconductor at arbitrary values of the applied voltage. The presence of long-range Coulomb correlations is found to be responsible for a reshaping of the spatial profile of the impedance field. This reshaping gives a null contribution to the macroscopic impedance but modifies essentially the transition from thermal to shot noise of a macroscopic linear resistor. Theoretical calculations explain a set of noise experiments carried out in semi-insulating CdZnTe detectors.

Thermal and back-action noises in dual-sphere gravitational-wave detectors

We study the sensitivity limits of a broadband gravitational-wave detector based on dual resonators such as nested spheres. We determine both the thermal and back-action noises when the resonators displacements are read out with an optomechanical sensor. We analyze the contributions of all mechanical modes, using a new method to deal with the force-displacement transfer functions in the intermediate frequency domain between the two gravitational-wave sensitive modes associated with each resonator. This method gives an accurate estimate of the mechanical response, together with an evaluation of the estimate error. We show that very high sensitivities can be reached on a wide frequency band for realistic parameters in the case of a dual-sphere detector.