Now showing items 1-17 of 17

    • A poro-thermoelastic problem with dissipative heat conduction 

      Bazarra, Noelia; Fernández, Jose R.; Magaña Nieto, Antonio; Quintanilla de Latorre, Ramón (2020-07-18)
      Article
      Open Access
      In this work, we study from the mathematical and numerical points of view a poro-thermoelastic problem. A long-term memory is assumed on the heat equation. Under some assumptions on the constitutive tensors, the resulting ...
    • An a priori error analysis of a porous strain gradient model 

      Baldonedo, Jacobo; Fernández, José Ramón; Magaña Nieto, Antonio; Quintanilla de Latorre, Ramón (Wiley-VCH, 2022-01)
      Article
      Open Access
      In this work, we consider, from the numerical point of view, a boundary-initial value problem for non-simple porous elastic materials. The mechanical problem is written as a coupled hyperbolic linear system in terms of ...
    • Decay of waves in strain gradient porous elasticity with Moore-Gibson-Thompson dissipation 

      Fernández García, José Ramon; Magaña Nieto, Antonio; Quintanilla de Latorre, Ramón (2022-09-05)
      Article
      Open Access
      We study a one-dimensional problem arising in strain gradient porous-elasticity. Three different Moore–Gibson–Thompson dissipation mechanisms are considered: viscosity and hyperviscosity on the displacements, and weak ...
    • Dynamics of fast pattern formation in porous silicon by laser interference 

      Pelaez de Fuentes, Ramon Javier; Khun, Timo; Vega Lerín, Fidel; Afonso Rodriguez, Carmen Nieves (2014-10-24)
      Article
      Open Access
      Patterns are fabricated on 290 nm thick nanostructured porous silicon layers by phase-mask laser interference using single pulses of an excimer laser (193 nm, 20 ns pulse duration). The dynamics of pattern formation is ...
    • Estudi de la macro i micro porositat en peces d'alumini moldejades 

      Albareda Lax, Daniel (Universitat Politècnica de Catalunya, 2018-06-21)
      Bachelor thesis
      Open Access
      La porositat és un defecte que presenten tots els aliatges d’alumini. Ja que l’ús d’alumini està experimentant un gran creixement a nivell mundial,és important conèixer els efectes d’aquests defectes a les propietats del ...
    • Estudio del efecto de la modificación con estroncio en la microestructura y las propiedades mecánicas de aleaciones Al-Si-Mg 

      Moreno Fina, Albert (Universitat Politècnica de Catalunya, 2020-07-14)
      Master thesis
      Open Access
      Un dels principals defectes que apareixen en els aliatges d'alumini obtinguts per fosa són els causats per la porositat. En aquest treball s’ha analitzat un aliatge Al-Si-Mg utilitzat per la fabricació de connectors d'alta ...
    • Estudio experimental del proceso de calentamiento de medios porosos saturados hasta ebullición-"Dryout" de su fase líquida 

      Carbonell Ventura, Montserrat (Universitat Politècnica de Catalunya, 2000-02-04)
      Doctoral thesis
      Open Access
      La experimentación y posterior modelización de los procesos de transporte y transferencia de calor y de masa en medios poroso saturados encuentra un gran número de dificultades que se derivan fundamentalmente de la ...
    • Fluid flow simulation and permeability computation in deformed porous carbonate grainstones 

      Zambrano, Miller; Tondi, Emanuele; Mancini, Lucia; Lanzafame, Gabriele; Trias Miquel, Francesc Xavier; Arzilli, Fabio; Materazzi, Fabio; Torrieri, Stefano (Elsevier, 2018-05-01)
      Article
      Open Access
      In deformed porous carbonates, the architecture of the pore network may be modified by deformation or diagenetic processes altering the permeability with respect to the pristine rock. The effects of the pore texture and ...
    • Gradient based porosity calculation in casting simulation 

      Díez Rodríguez, Daniel (Universitat Politècnica de Catalunya, 2017-06-15)
      Master thesis
      Open Access
      Porosity is one of the most common defects in casting production. When some parts of the casting begin to solidify they contract due to the difference of densities between the liquid and solid phases. The areas that are ...
    • Improving selective thermal emission properties of three-dimensional macroporous silicon through porosity tuning 

      Garin Escriva, Moises; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón; Marquier, F.; Arnold, C.; Greffet, J.-J. (American Institute of Physics, 2008-08-27)
      Article
      Restricted access - publisher's policy
      We present a theoretical and experimental study on the effect of progressive porosity increase, through multiple oxidation/oxide removal steps, upon the optical characteristics in threedimensional macroporous silicon. ...
    • Influencia del tipo de fibra y la porosidad de los tejidos en el factor de protección a la radiación ultravioleta proporcionado por tejidos de verano 

      Algaba Joaquín, Inés María; Riva Juan, Ascensión; Crews, P. C. (Instituto de Investigación Textil y Cooperación Industrial, 2004-07)
      Article
      Open Access
      El efecto de la radiación ultravioleta sobre la piel humana es un tema de interés creciente, debido principalmente al incremento de la incidencia del cáncer de piel en algunos países. Las prendas proporcionan alguna ...
    • Magnesium phosphate cement formulated with low grade magnesium oxide with controlled porosity and low thermal conductivity as a function of admixture 

      Niubó Eslava, Maria; Formosa Mitjans, Joan; Maldonado Alameda, Alex; del Valle Zermeño, Ricardo; Chimenos Ribera, Josep Maria (2016-10)
      Article
      Open Access
      Magnesium phosphate cement (MPC) formulated with low-grade magnesium oxide (LG-MgO) can be better considered as sustainable MPC (sust-MPC). Among other properties, sust-MPC could be used as building material for constructive ...
    • On the time decay for the MGT-type porosity problems 

      Baldonedo, Jacobo; Fernández, Jose R.; Quintanilla de Latorre, Ramón (American Institute of Mathematical Sciences, 2022-08)
      Article
      Open Access
      In this work we study three different dissipation mechanisms arising in the so-called Moore-Gibson-Thompson porosity. The three cases correspond to the MGT-porous hyperviscosity (fourth-order term), the MGT-porous viscosity ...
    • SEM image analysis in permeable recycled concretes with silica fume. A quantitative comparison of porosity and the ITZ 

      Chinchillas Chinchillas, Manuel de Jesús; Rosas Casarez,, Carlos Antonio; Arredondo Rea, Susana Paola; Gómez Soberón, José Manuel Vicente; Corral Higuera, Ramón (Multidisciplinary Digital Publishing Institute (MDPI), 2019-07-01)
      Article
      Open Access
      Recycled aggregates (RA) from construction and demolition can be used in permeable concretes (PC), improving the environment. PCs have a significant porous network, their cement paste and the interaction between the paste ...
    • Time decay for porosity problems 

      Baldonedo, Jacobo; Fernández, Jose R.; Quintanilla de Latorre, Ramón (2022-05-30)
      Article
      Open Access
      In this paper, we numerically study porosity problems with three different dissipa- tion mechanisms. The root behavior is analyzed for each case. Then, by using the finite element method and the Newmark- scheme, fully ...
    • Two different strategies to enhance osseointegration in porous titanium: Inorganic thermo-chemical treatment versus organic coating by peptide adsorption 

      Ortiz Hernández, Mónica; Rappe, K.; Molmeneu Trias, Meritxell; Mas Moruno, Carlos; Guillem Martí, Jordi; Punset Fuste, Miquel; Caparrós, Cristina; Calero Martínez, José Antonio; Franch, Jordi; Fernández Fairén, Mariano; Gil, Javier (2018-08-30)
      Article
      Open Access
      In this study, highly-interconnected porous titanium implants were produced by powder sintering with different porous diameters and open interconnectivity. The actual foams were produced using high cost technologies: ...
    • Void content minimization in vacuum infusion (VI) via effective degassing 

      Juan Muñoz, Jaime; Silva, Arlindo; Tornero García, José Antonio; Gamez Pérez, José; Salán Ballesteros, Maria Núria (Multidisciplinary Digital Publishing Institute (MDPI), 2021-08-27)
      Article
      Open Access
      This paper addresses the major concern which component porosity represents in Vacuum Infusion (VI) manufacturing due to resin gelation at pressures close to absolute vacuum. Degassing is a fundamental step to minimize or ...