Exploració per tema "Spectroscopy"

Ara es mostren els items 1-20 de 43

    • A robust comparison of dynamical scenarios in a glass-forming liquid 

      Vispa, Alessandro; Busch, Sebastian; Tamarit Mur, José Luis; Unruh, Tobias; Fernandez-Alonso, Felix; Pardo Soto, Luis Carlos (2016-02-07)
      Article
      Accés obert
      We use Bayesian inference methods to provide fresh insights into the sub-nanosecond dynamics of glycerol, a prototypical glass-forming liquid. To this end, quasielastic neutron scattering data as a function of temperature ...

    • Bio-nanohybrid catalysts based on L-leucine immobilized in hydrotalcite and their activity in aldol reaction 

      Crivoi, Dana-Georgiana; Miranda, Ronald Alexander; Finocchio, Elisabetta; Llorca Piqué, Jordi; Ramis, Gianguido; Sueiras, Jesus Eduardo; Segarra González, Anna Maria; Medina Mena, Francisco (2016-06-05)
      Article
      Accés obert
      Nanohybrid materials based on L-leucine (L-Leu) and hydrotalcites (HT) were prepared by the ion exchange and reconstruction method, under mild synthesis conditions. The location, amount and the form of the immobilized L-Leu ...

    • Caractérisation des signaux radio avec des outils de traitement d’images 

      Morral Adell, Gemma (Universitat Politècnica de Catalunya, 2011-05-09)
      Projecte/Treball Final de Carrera
      Accés obert
      Realitzat a/amb:   École nationale supérieure des télécommunications
      Català: Ens basem en una representació 2D en temps-freqüència dels senyals rebuts després d'una detecció no-coherent ("square law detector" és a dir, es prèn el módul al quadrat de les NFFT dels senyals rebuts dins una ...

    • Chitosan microcapsules: methods of the production and use in textile finishing 

      Borges Valle, Jorge Alexandre; Sisqueira Curto Valle, Rita de Cassia; Krause Bierhalz, Andrea Cristiane; Maesta Bezerra, Fabricio; López Hernández, Arianne; Lis Arias, Manuel José (Wiley, 2021-01-13)
      Article
      Accés obert
      Biopolymeric chitosan is considered a promising encapsulating agent for tex-tile applications due to its biocompatibility, lack of toxicity, antibacterial activ-ity, high availability, and low cost. After cellulose, it is ...

    • Compact, multi-exposure speckle contrast optical spectroscopy (SCOS) device for measuring deep tissue blood flow 

      Dragojević, Tanja; Hollmann, Joseph L.; Tamborini, Davide; Portaluppi, Davide; Buttafava, Mauro; Culver, Joseph P.; Villa, Federica; Durduran, Turgut (OSA, 2017-12-20)
      Article
      Accés obert
      Speckle contrast optical spectroscopy (SCOS) measures absolute blood flow in deep tissue, by taking advantage of multi-distance (previously reported in the literature) or multi-exposure (reported here) approach. This method ...

    • Detection of adulterations in fruit juices using machine learning methods over FT-IR spectroscopic data 

      Pérez Calle, José Luis; Ferreiro González, Marta; Ruiz-Rodríguez, Ana; Fernández Martínez, Daniel; Palma, Miguel (Multidisciplinary Digital Publishing Institute (MDPI), 2022-03)
      Article
      Accés obert
      Fruit juices are one of the most adulterated beverages, usually because of the addition of water, sugars, or less expensive fruit juices. This study presents a method based on Fourier transform infrared spectroscopy (FT-IR), ...

    • Effect of inclusion of pitch-angle dependence on a simplified model of RF deposition in tokamak plasma 

      Taylor, David; Mantsinen, Mervi J.; Gallart Escolà, Dani; Manyer Fuertes, Jordi; Sirén, P.; JET Contributors (IOP Publishing, 2022-04)
      Article
      Accés obert
      Using the PION ICRH modelling code and comparisons against JET tokamak experiments, the effect of including pitch angle dependence within the RF diffusion operator on the fast ion particle distribution functions is quantified. ...

    • Effects of photon reabsorption phenomena in confocal micro-photoluminescence measurements in crystalline silicon 

      Roige, Abel; Alvarez, J.; Jaffre, A.; Desrues, T.; Martín García, Isidro; Alcubilla González, Ramón; Kleider, J.P. (American Institute of Physics (AIP), 2017-02-14)
      Article
      Accés obert
      Confocal micro-photoluminescence (PL) spectroscopy has become a powerful characterization technique for studying novel photovoltaic (PV) materials and structures at the micrometer level. In this work, we present a comprehensive ...

    • El servicio de espectroscopía de la Universidad de Barcelona 

      Vallmitjana Rico, Santiago; Marzoa Domínguez, Antonio (Sociedad Española de Óptica (SEDOPTICA), 2021)
      Comunicació de congrés
      Accés obert
      La colección de instrumentos científicos de la Facultad de Física de la Universidad de Barcelona incluye varios espectroscopios de distintos tipos. A partir del estudio de dichos espectroscopios, se presenta una aproximación ...

    • Enhanced gamma-ray emission from neutron unbound states populated in beta decay 

      Taín Enríquez, José Luis; Valencia, E.; Algora, A.; Rubio, B.; Maurice, S.; Gelletly, W.; Fallot, M.; Rissanen, J.; Eronen, T.; Äystö, J.; Batist, L.; Bowry, M.; Caballero Folch, Roger; Gómez Hornillos, María Belén; Gorlychev, V.; Mendoza, E.; Moore, I.; Penttila, H.; Reponen, M.; Sonnenschein, V. (2015-08-06)
      Article
      Accés obert

    • Enhanced sensitivity and contrast with bimodal atomic force microscopy with small and ultra-small amplitudes in ambient conditions 

      Santos Hernández, Sergio (2013-12-02)
      Article
      Accés obert
      Here, we introduce bimodal atomic force microscopy operated with sub-nm and ultra-small, i.e., sub-angstrom, first and second mode amplitudes in ambient conditions. We show how the tip can be made to oscillate in the ...

    • Estudio de las propiedades fisicas en regiones chocadas en nebulosas planetarias 

      Castrillón Camacho, Arjuna (Universitat Politècnica de Catalunya, 2021-05-12)
      Tesi
      Accés obert
      Planetary nebulae play a very important role in the chemical evolution of galaxies since they are responsible for returning nuclear-processed material to the interstellar medium. Observations of planetary nebulae are used ...

    • Frequency-correlation requirements on the biphoton wave function in an induced-coherence experiment between separate sources 

      Rojas Santana, Arturo; Jiménez Machado, Gerard; López Mago, Dorilian; Pérez Torres, Juan (American Physical Society, 2020-11-11)
      Article
      Accés obert
      There is renewed interest in using the coherence between beams generated in separate down- converter sources for new applications in imaging, spectroscopy, microscopy and optical coherence tomography (OCT). These schemes ...

    • Hardware simulator for optical correlation spectroscopy with Gaussian statistics and arbitrary correlation functions 

      Molteni, Matteo; Weigel, Udo M.; Remiro, Francisco; Durduran, Turgut; Ferri, Fabio (OSA, 2014-11-04)
      Article
      Accés obert
      We present a new hardware simulator (HS) for characterization, testing and benchmarking of digital correlators used in various optical correlation spectroscopy experiments where the photon statistics is Gaussian and the ...

    • Human blue cone opsin regeneration involves secondary retinal binding with analog specificity 

      Srinivasan, Sundaramoorthy; Fernández Sampedro, Miguel Ángel; Morillo Cazorla, Margarita; Ramon Portés, Eva; Jiménez Rosés, Mireia; Cordomi, Arnau; Garriga Solé, Pere (2018-03-27)
      Article
      Accés obert
      Human color vision is mediated by the red, green, and blue cone visual pigments. Cone opsins are G-protein-coupled receptors consisting of an opsin apoprotein covalently linked to the 11-cis-retinal chromophore. All visual ...

    • In situ chemical modification of C–S–H induced by CO2 laser irradiation 

      Martínez Ramírez, Sagrario; Díaz Sol, Luis M.; Martín Garrido, Moisés; Fernández Carrasco, Lucía; Torrens Martín, David (2018-02)
      Article
      Accés obert
      Fire-induced compositional changes lead to strength loss and even failure in cement and concrete. Calcium silicate hydrate (C–S–H) gel, the main product of cement hydration, dehydrates at 25–200 °C, while temperatures of ...

    • Linear identification and model adjustment of a PEM fuel cell stack 

      Husar, Attila Peter; Kunusch, Cristian; Puleston, Paul; Mayosky, Miguel Á.; Moré, J.J. (Elsevier, 2008)
      Article
      Accés obert
      In the context of fuel cell stack control a mayor challenge is modeling the interdependence of various complex subsystem dynamics. In many cases, the states interaction is usually modeled through several look-up tables, ...

    • Liquid phantoms for near-infrared and diffuse correlation spectroscopies with tunable optical and dynamic properties 

      Cortese, Lorenzo; Presti, Giuseppe Lo; Pagliazzi, Marco; Contini, Davide; Mora, Alberto Dalla; Pifferi, Antonio; Venkata Sekar, Sanathana Konugolu; Spinelli, Lorenzo; Taroni, Paola; Zanoletti, Marta; Weigel, Udo M.; Fraguier, Sixte de; Nguyen-Dihn, An; Rosinski, Bogdan; Durduran, Durduran (OSA, 2018-04-04)
      Article
      Accés obert
      We present the recipe and characterization for preparing liquid phantoms that are suitable for both near-infrared spectroscopy and diffuse correlation spectroscopy. The phantoms have well-defined and tunable optical and ...

    • Macroporous silicon for spectroscopic CO2 detection 

      Vega, Didac; Marti Alcaire, Ferran; Rodríguez Martínez, Ángel; Todorov Trifonov, Trifon (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A carbon dioxide sensor based on a photonic crystal of macroporous silicon and measurements of its response are presented in this paper. Photonic crystals have opened new ways for the miniaturization of optical detector ...

    • Multicolour single molecule emission and excitation spectroscopy reveals extensive spectral shifts 

      Piatkowski, Lukasz; Gellings, Esther; Hulst, Niek F. van (The Royal Society of Chemistry, 2015-07-16)
      Article
      Accés obert
      We explore the distribution and shape of single molecule spectra at room temperature, when embedded in a polymer host. Multicolour excitation and emission spectroscopy is implemented to capture the full inhomogeneous ...