Exploració per tema "Silica"

Ara es mostren els items 1-14 de 14

    • Análisis de materiales compuestos para la mejora de la durabilidad de neumáticos 

      Pinheiro Vidal, Arthur (Universitat Politècnica de Catalunya, 2020-10-27)
      Treball Final de Grau
      Accés obert
      Este trabajo constituye un análisis exhaustivo que tiene como objetivo principal mejorar la durabilidad de los neumáticos. En concreto, enfocándose en los materiales. Un propósito cada vez más buscado debido a los problemas ...

    • Cómo afectan la velocidad y la temperatura en el desgaste de los neumáticos y cómo preservarlos 

      García Bescansa, Pablo (Universitat Politècnica de Catalunya, 2020-02-06)
      Treball Final de Grau
      Accés obert
      [CASTELLÀ] El presente documento plasma un estudio realizado del desgaste de los neumáticos. Este supone un problema para los usuarios de vehículos automovilísticos, además de ser una de las principales causas por fallo ...

    • Designer SiO2 metasurfaces for efficient passive radiative cooling 

      Ding, Zhenmin; Li, Honglin; Li, Xin; Fan, Xueying; Jaramillo Fernández, Juliana; Pattelli, Lorenzo; Zhao, Jiupeng; Niu, Shichao; Li, Yao; Xu, Hongbo (John Wiley & sons, 2023-11-27)
      Article
      Accés obert
      In recent years, an increasing number of passive radiative cooling materials are proposed in the literature, with several examples relying on the use of silica (SiO2) due to its unique stability, non-toxicity, and availability. ...

    • Evaluación cualitativa polvo de sílice 

      Hurtado Gisbert, Albert (Universitat Politècnica de Catalunya, 2020-05-19)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      El objeto principal de este Trabajo Final de Máster es realizar un estudio cualitativo del nivel de riesgo por exposición a sílice en la empresa TERSA con el fin de determinar si es necesario llevar a cabo una evaluación ...

    • High temperature cyclic oxidation behavior of low manganese Fe12Mn9Cr5Si4Ni-NbC shape memory stainless steels 

      de Sousa Malafaia, Artur Mariano; della Rovere, Carlos Alberto; Baldan, Renato; Suárez Fernández, Lucía; Cabrera Marrero, José M.; Falcão de Oliveira, Marcelo (2021-03-15)
      Article
      Accés obert
      High amounts of Mn in Fe-Mn-Si-Cr-Ni shape memory stainless steels are detrimental for oxidation resistance at high temperatures. However, in order to maintain the shape memory effect of these alloys the content of manganese ...

    • Impact of colloidal silica treatment on an earthfill dam 

      Fraccica, Alessandro; Spagnoli, Giovanni; Romero Morales, Enrique Edgar; Arroyo Alvarez de Toledo, Marcos (American Society of Civil Engineers (ASCE), 2022)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The impact of the use of sand treated with Colloidal Silica (CS) on a model 80 m high-earthfill dam was assessed through numerical modelling. The hydro-mechanical properties of the CS-Treated soil were taken from a previous ...

    • Nonlinear effects of electrode and bragg reflector materials in BAW resonators 

      García Pastor, David; González Rodríguez, Marta; Hueltes Escobar, Alberto; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; González Arbesú, José María; Kreuzer, Susanne; Aigner, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This work presents a broadband characterization and modeling of the second harmonic nonlinear response in Bulk acoustic wave (BAW) resonators. The proposed circuit model is based on the constitutive equations describing ...

    • Partially Diffusive Helium-Silica Compound under High Pressure 

      Liu, Cong; Wang, Junjie; Deng, Xin; Wang, Xiaomeng; Pickard, Chris J.; Helled, Ravit; Wu, Zhongqing; Wang, Hui-Tian; Xing, Dingyu; Sun, Jian (Institute of Physics (IOP), 2022-06-01)
      Article
      Accés obert
      Helium is the second most abundant element in the universe, and together with silica, they are important components of giant planets. Exploring the reactivity and state of helium and silica under high pressure is crucial ...

    • Preparation of SBA-15 and Zr-SBA-15 materials by direct-synthesis and pH-adjustment methods 

      Chimentäo, Ricardo José; Peixoto, Agnes; Llorca Piqué, Jordi (2021-10-15)
      Article
      Accés obert
      SBA-15 mesoporous silica materials with zirconium atoms incorporated into its structure were prepared by two methods: direct-synthesis and pH-adjustment. Two nominal ratios of Zr/Si = 0 and 0.10 were evaluated. N2-physisorption, ...

    • Reducción de la sílice en aguas mediante la precipitación de hidróxido de magnesio 

      Inchausti Socorro, Francisco Daniel (Universitat Politècnica de Catalunya, 2020-06-19)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      El control de depósitos a base de sílice en sistemas de agua industriales, incluida la ósmosis inversa, es uno de los desafíos más difíciles en los procesos de tratamiento de agua. La reducción de la producción de permeado, ...

    • Self-assembly of ordered silica nanostructures by electrospray 

      Coll Valentí, Arnau; Bermejo Broto, Sandra; Castañer Muñoz, Luis María (2014-06-01)
      Article
      Accés restringit per política de l'editorial
      In this paper we introduce the electrospray technique as a suitable method to create SiO2 3D ordered nanostructures. We describe the experimental procedure and deposition parameters required. We have found that the use of ...

    • Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization 

      Alvarez, Mayra G; Chimentao, Ricardo J; Tichit, D.; Santos, Jeannette B O; Dafinov, Antonio; Modesto Lopez, Luis B; Rosell Llompart, Joan; Gueell, E. J.; Gispert Guirado, Francesc; Llorca Piqué, Jordi; Medina Mena, Francisco (2016-01-01)
      Article
      Accés obert
      Aluminum was incorporated into SBA-15 supports at molar ratios Si/Al = 10 and 2 by the pH-adjusting method. The calcined mesoporous Al-SBA-15 supports, as well as the Al-free SBA-15 support, were impregnated with ammonium ...

    • The dynamics of PdO-Pd phase transformation in the presence of water over Si-doped Pd/CeO 2 methane oxidation catalysts 

      Toso, Alessandra; Colussi, Sara; Llorca Piqué, Jordi; Trovarelli, Alessandro (2019-03-25)
      Article
      Accés obert
      One of the main issues for the catalytic abatement of methane from natural gas fueled vehicles over Pd-based materials is due to the large amount of water vapor in the exhausts, which can severely deactivate the catalyst. ...

    • Um modelo para detectar a geração de plasma num processo de sinterização de sílica SPS 

      Codony Domènech, Víctor (Universitat Politècnica de Catalunya / Universidade de São Paulo, 2013)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Universidade de São Paulo
      O problema inverso de identificação de fontes de calor pontuais é proposto como uma forma de detectar a geração de plasma num processo de sinterização SPS. Depois um esquema de resolução utilizando o método dos elementos ...