Now showing items 1-13 of 13

    • Binary interaction parameters from reacting mixture data. Supercritical biodiesel process with CO2 as cosolvent 

      Valverde Salamanca, Abel; Osmieri, Luigi; Recasens Baxarías, Francisco Javier (2019-01-01)
      Article
      Open Access
      A method is presented for the calculation of binary interaction parameters from reacting mixture data. The process studied is the supercritical methanol transesterification of triolein with CO2 as cosolvent. The reaction ...
    • Effects of reduced discrete coupling on filament tension in excitable media 

      Alonso Muñoz, Sergio; Baer, Markus; Panfilov, Alexander V (Institute of Physics (IOP), 2011-03-29)
      Article
      Open Access
      Wave propagation in the heart has a discrete nature, because it is mediated by discrete intercellular connections via gap junctions. Although effects of discreteness on wave propagation have been studied for planar traveling ...
    • Estudi comparatiu de diverses equacions d'estat cúbiques tipus van der Waals per a determinar propietats termodinàmiques de fluids refrigerants purs 

      López Cabos, Carlos (Universitat Politècnica de Catalunya, 2015-09-10)
      Master thesis (pre-Bologna period)
      Open Access
      Des de que a l’any 1873 van der Waals va publicar la seva equació d’estat, la qual ha donat lloc a la família d’equacions cúbiques d’estat tipus van der Waals (vdW), s’han publicat nombroses modificacions de la mateixa per ...
    • Estudi d’aplicabilitat de l'equació d'estat de SOAVE-BWR per a determinar propietats termodinàmiques de fluids refrigerants purs 

      Margalef Escorcia, Alba (Universitat Politècnica de Catalunya, 2019-01-30)
      Bachelor thesis
      Open Access
      [CATALÀ] Donada la importància dels refrigerants en la indústria és essencial a l’hora de la utilització dels mateixos en qualsevol sistema o equipament, el poder disposar de mètodes de predicció del seu comportament en ...
    • External temperature effects on the hysteresis of NiTi wires in dampers for stay-cables 

      Torra Ferré, Vicenç; Carreras, Guillem; Casciati, Sara; Auguet Sangrá, Carlota E. (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2014)
      Conference report
      Open Access
      The use of NiTi wires, one of the Shape Memory Alloy (SMA) materials that permits efficient damping in stayed cables for bridges, requires an appropriate behavior when exposed to the external temperature effects. The ...
    • First-principles modeling of quantum nuclear effects and atomic interactions in solid He-4 at high pressure 

      Cazorla Silva, Claudio; Boronat Medico, Jordi (2015-01-07)
      Article
      Open Access
      We present a first-principles computational study of solid He-4 at T = 0 K and pressures up to similar to 160 GPa. Our computational strategy consists in using van der Waals density functional theory (DFT-vdW) to describe ...
    • Langevin equations with multiplicative noise: application to domain growth 

      Sancho, Jose Maria; Hernández-Machado, A.; Ramírez de la Piscina Millán, Laureano; Lacasta Palacio, Ana María (Jagiellonian University, Polish Academy of Arts and Sciences, 1993-05-01)
      Article
      Open Access
      Langevin Equations of Ginzburg--Landau form, with multiplicative noise, are proposed to study the effects of fluctuations in domain growth. These equations are derived from a coarse-grained methodology. The Cahn--Hiliard--Cook ...
    • Low-dimensional weakly interacting Bose gases: nonuniversal equations of state 

      Astrakharchik, Grigori; Boronat Medico, Jordi; Kurbakov, I L; Lozovik, Y E; Mazzanti Castrillejo, Fernando Pablo (2010-01)
      Article
      Open Access
      The zero-temperature equation of state is analyzed in low-dimensional bosonic systems. We propose to use the concept of energy-dependent s-wave scattering length for obtaining estimations of nonuniversal terms in the energy ...
    • One dimensional H-1, H-2 and H-3 

      Vidal, A.J.; Astrakharchik, Grigori; Vranješ Markic, Leandra; Boronat, J. (2016-05-26)
      Article
      Open Access
      The ground-state properties of one-dimensional electron-spin-polarized hydrogen H-1, deuterium H-2, and tritium 3 Hare obtained by means of quantum Monte Carlo methods. The equations of state of the three isotopes are ...
    • Pattern formation during mesophase growth in a homologous series 

      Tóth Katona, T.; Börzsönyi, T.; Váradi, Z.; Szabon, J.; Buka, A.; González Cinca, Ricardo; Ramírez de la Piscina Millán, Laureano; Casademunt, Jaume; Hernández-Machado, Aurora (American Physical Society, 1996-08-01)
      Article
      Restricted access - publisher's policy
      Remarkable differences in the shape of the nematic-smectic-B interface in a quasi-two-dimensional geometry have been experimentally observed in three liquid crystals of very similar molecular structure, i.e., neighboring ...
    • Stationary states and phase diagram for a model of the Gunn effect under realistic boundary conditions 

      Gomila Lluch, Gabriel; Rubí Capaceti, José Miguel; Rodríguez Cantalapiedra, Inma; Bonilla, L. L. (The American Physical Society, 1997-08-01)
      Article
      Open Access
      A general formulation of boundary conditions for semiconductor-metal contacts follows from a phenomenological procedure sketched here. The resulting boundary conditions, which incorporate only physically well-defined ...
    • Transport and diffusion on crystalline surfaces under external forces 

      Lindenberg, Katja; Lacasta Palacio, Ana María; Sancho, Jose Maria; Romero, A. H. (IOP Publishing, 2005-01-31)
      Article
      Open Access
      We present a numerical study of classical particles obeying a Langevin equation and moving on a solid crystalline surface under an external force that may either be constant or modulated by periodic oscillations. We focus ...
    • Unveiling nonlinear dynamics in resonant inductively coupled wireless power transfer 

      Bou Balust, Elisenda; El Aroudi, Abdelali; Fisher, Peter; Alarcón Cot, Eduardo José (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      Coupled magnetic resonance is considered to be a key enabling technology for mid-range wireless power transfer. Models and systems have hitherto considered linear resonators as underlying dynamics, thereby limiting practical ...