El Portafoli de l'alumne com instrument d'autoaprenentatge

Presentem el Projecte d'Innovació Docent que es porta a terme des de la Unitat d'Infermeria de Salut Mental de l'Escola d'Infermeria de la Universitat de Barcelona dins de la formació especialitzada d'Infermeria de Salut Mental. Aquesta especialitat es desenvolupa en règim de residència clínica on el EIR (Enfermero Interno Residente) rep formació des de l'àmbit assistencial i docent. El portafoli de l'alumne es planteja com un instrument d'autoaprenentatge reflexiu que ha de contribuir a facilitar l'adaptació de la formació global del EIR als criteris del Espai Europeu de Formació Superior on el treball de l'alumne (concretat en el crèdit ECTS) és l'eix central de les metodologies docents.

Particle shape and orientation in laser diffraction and static image analysis size distribution analysis of micrometer sized rectangular particles

Laser diffraction (LD) and static image analysis (SIA) of rectangular particles [United States Pharmacopeia, USP30-NF25, General Chapter <776>, Optical Miroscopy.] have been systematically studied. To rule out sample dispersion and particle orientation as the root cause of differences in size distribution profiles, we immobilize powder samples on a glass plate by means of a dry disperser. For a defined region of the glass plate, we measure the diffraction pattern as induced by the dispersed particles, and the 2D dimensions of the individual particles using LD and optical microscopy, respectively. We demonstrate a correlation between LD and SIA, with the scattering intensity of the individual particles as the dominant factor. In theory, the scattering intensity is related to the square of the projected area of both spherical and rectangular particles. In traditional LD the size distribution profile is dominated by the maximum projected area of the particles (A). The diffraction diameters of a rectangular particle with length L and breadth B as measured by the LD instrument approximately correspond to spheres of diameter ØL and ØB respectively. Differences in the scattering intensity between spherical and rectangular particles suggest that the contribution made to the overall LD volume probability distribution by each rectangular particle is proportional to A2/L and A2/B. Accordingly, for rectangular particles the scattering intensity weighted diffraction diameter (SIWDD) explains an overestimation of their shortest dimension and an underestimation of their longest dimension. This study analyzes various samples of particles whose length ranges from approximately 10 to 1000 μm. The correlation we demonstrate between LD and SIA can be used to improve validation of LD methods based on SIA data for a variety of pharmaceutical powders all with a different rectangular particle size and shape.

Trust region versus line search for computing the optical flow

We consider the numerical treatment of the optical flow problem by evaluating the performance of the trust region method versus the line search method. To the best of our knowledge, the trust region method is studied here for the first time for variational optical flow computation. Four different optical flow models are used to test the performance of the proposed algorithm combining linear and nonlinear data terms with quadratic and TV regularization. We show that trust region often performs better than line search; especially in the presence of non-linearity and non-convexity in the model.

Optical spectroscopy of microquasar candidates at low Galactic latitudes

We report optical spectroscopic observations of a sample of 6 low-galactic latitude microquasar candidates selected by cross-identification of X-ray and radio point source catalogs for |b|<5 degrees. Two objects resulted to be of clear extragalactic origin, as an obvious cosmologic redshift has been measured from their emission lines. For the rest, none exhibits a clear stellar-like spectrum as would be expected for genuine Galactic microquasars. Their featureless spectra are consistent with being extragalactic in origin although two of them could be also highly reddened stars. The apparent non-confirmation of our candidates suggests that the population of persistent microquasar systems in the Galaxy is more rare than previously believed. If none of them is galactic, the upper limit to the space density of new Cygnus X-3-like microquasars within 15 kpc would be 1.1\times10^{-12} per cubic pc. A similar upper limit for new LS 5039-like systems within 4 kpc is estimated to be 5.6\times10^{-11} per cubic pc.

Structural and optical properties of high quality zinc-blende/wurtzite GaAs nanowire heterostructures

The structural and optical properties of three different kinds of GaAs nanowires with 100% zinc-blende structure and with an average of 30% and 70% wurtzite are presented. A variety of shorter and longer segments of zinc-blende or wurtzite crystal phases are observed by transmission electron microscopy in the nanowires. Sharp photoluminescence lines are observed with emission energies tuned from 1.515 eV down to 1.43 eV when the percentage of wurtzite is increased. The downward shift of the emission peaks can be understood by carrier confinement at the interfaces, in quantum wells and in random short period superlattices existent in these nanowires, assuming a staggered band offset between wurtzite and zinc-blende GaAs. The latter is confirmed also by time-resolved measurements. The extremely local nature of these optical transitions is evidenced also by cathodoluminescence measurements. Raman spectroscopy on single wires shows different strain conditions, depending on the wurtzite content which affects also the band alignments. Finally, the occurrence of the two crystallographic phases is discussed in thermodynamic terms.

Understanding Optical Trapping Phenomena: a Simulation for Undergraduates

Optical trapping is an attractive and multidisciplinary topic that has become the center of attention to a large number of researchers. Moreover, it is a suitable subject for advanced students that requires a knowledge of a wide range of topics. As a result, it has been incorporated into some syllabuses of both undergraduate and graduate programs. In this paper, basic concepts in laser trapping theory are reviewed. To provide a better understanding of the underlying concepts for students, a Java application for simulating the behavior of a dielectric particle trapped in a highly focused beam has been developed. The program illustrates a wide range of theoretical results and features, such as the calculation of the force exerted by a beam in the Mie and Rayleigh regimes or the calibration of the trap stiffness. Some examples that are ready to be used in the classroom or in the computer lab are also supplied.

Optical trapping: a review of essential concepts

Optical tweezers are an innovative technique for the non-contact, all-optical manipulation of small material samples, which has extraordinarily expanded and evolved since its inception in the mid-80s of the last century. Nowadays, the potential of optical tweezers has been clearly proven and a wide range of applications both from the physical and biological sciences have solidly emerged, turning the early ideas and techniques into a powerful paradigm for experimentation in the micro- and nanoworld. This review aims at highlighting the fundamental concepts that are essential for a thorough understanding of optical trapping, making emphasis on both its manipulation and measurement capabilities, as well as on the vast array of important biological applications appeared in the last years.

La Inclusió dels alumnes amb necessitats educatives especials. Accés al currículum ordinari a través dels Plans Individualitzats. Traducció i adaptació de l’SPOT (instrument per analitzar els PIs).

Actualment, és cada vegada més present en la nostra societat la paraula inclusió i més concretament en el nostre àmbit educatiu, el concepte d’educació inclusiva. Aquest treball pretén presentar una eina adaptada i traduïda al català anomenada Student Program Observation Tools, la qual serveix per fer un anàlisi d’una de les mesures d’atenció a la diversitat: els Plans Individualitzats, per tal de millorar-ne el contingut i ésser una ajuda per a les escoles però també perquè els alumnes amb necessitats educatives especials puguin tenir accés al currículum ordinari com la resta dels seus companys de classe.

Col.legi d' educadors socials de Catalunya: un nou i necessari instrument al servei de la professió

Sempre és difícil assignar un origen a les iniciatives socials perquè, la majoria de vegades, solen resultar conseqüència de l'esforç col.lectiu de moltes persones i institucions. De totes formes podríem dir que del Col·legi Professional se'n parla, en molts dels àmbits de l'educació social, des de mitjans dels anys vuitanta. De fet, ja en la I Trobada d'Educadors Especialitzats Faustino Guerau (Barcelona, octubre de 1988), en parlar de les formes organitzatives del col.lectiu professional, ja va fer aparició aquest objectiu. Però llavors, ni tan sols existien associacions d'educadors en tot l'Estat espanyol, ni una Federació que les coordinés. El tema es reprèn en el I Congrés d'Educadors de Pamplona (març de 1987) i en el X Col.loqui Internacional de la AIEJI(J) (Barcelona, novembre de 1989). La prioritat es fixà en la creació de la Diplomatura i en això es posaren tots els esforços fins 1991. Després va seguir un període de crisi en les Associacions d'Educadors que se supera a finals del 1993. D'aquesta crisi se'n surt col·lectivament, amb una sèrie d'objectius entre els que ocupa un espai central el Col·legi Oficial. Així doncs, en el I Congrés de l'Educador Social d'abril de 1995 a Múrcia, un dels àmbits temàtics oberts fou el del Col·legi Professional. Més en concret, l' Associació Professiona1 d'Educadors Socials de Catalunya -APESC-, escull des del 1994, aquesta com una de les seves fites fonamentals per al bienni 1994-96. I en aquesta línia inicia des del 94 diferents contactes instituciona1s, polítics, amb altres col.lectius professionals, a1umnes ...

Optical Encryption using Photon-Counting Polarimetric Imaging

We present a polarimetric-based optical encoder for image encryption and verification. A system for generating random polarized vector keys based on a Mach-Zehnder configuration combined with translucent liquid crystal displays in each path of the interferometer is developed. Polarization information of the encrypted signal is retrieved by taking advantage of the information provided by the Stokes parameters. Moreover, photon-counting model is used in the encryption process which provides data sparseness and nonlinear transformation to enhance security. An authorized user with access to the polarization keys and the optical design variables can retrieve and validate the photon-counting plain-text. Optical experimental results demonstrate the feasibility of the encryption method.

La historiografia com a instrument de propaganda política : La conquesta de Mallorca des de les cròniques medievals

Aproximació als fets de la conquesta de Mallorca per Jaume I a través de la historiografia catalana medieval i el seu ús com a instrument de propaganda política.

Lyra Viol “Instrument de música domèstica”

El propòsit d'aquest treball és donar a conèixer la lyra viol i la seva música. Entre d'altres maneres de tocar aquest instrument, mostrar com aquest servia per acompanyar la veu, així com arranjar peces polifòniques tal i com trobem en publicacions de l'època. I serà a partir d'aquests exemples, que he fet els meus propis arranjaments per a viola de gamba i que incloc en aquest treball.

Surface passivation and optical characterization of Al2O3/a-SiCx stacks on c-Si substrates

Postprint (published version)

All-Optical Unicast/Multicast Routing in WDM Networks

Optical transport networks (OTN) must be prepared in terms of better resource utilization, for accommodating unicast and multicast traffic together. Light-trees have been proposed for supporting multicast connections in OTN. Nevertheless when traffic grooming is applied in light-trees, resources can be underutilized as traffic can be routed to undesirable destinations in order to avoid optical-electrical-optical (OEO) conversions. In this paper, a novel architecture named S/G light- tree for supporting unicast/multicast connections is proposed. The architecture allows traffic dropping and aggregation in different wavelengths without performing OEO conversions. A heuristic that routes traffic demands using less wavelengths by taking advantage of the proposed architecture is designed as well. Simulation results show that the architecture can minimize the number of used wavelengths and OEO conversions when compared to light-trees