Browsing by Subject "Dielectrics"

Now showing items 21-40 of 51

    • Efecto de la reducción simétrica del plano de tierra en líneas microstrip 

      Bará Temes, Francisco Javier (1981)
      Conference report
      Open Access
      The variations of the characteristic impedance and wavelength of a symmetrical biplate line with the width of the upper plate held constant are studied, for several widely used dielectrics, by the method of moments with a ...

    • Efficient analysis of homogeneous dielectric and plasmonic media with integral equation MEI (IE-MEI) 

      Rius Casals, Juan Manuel; Planes Conangla, Gerard; Úbeda Farré, Eduard; Heldring, Alexander (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference lecture
      Restricted access - publisher's policy
      This paper revisits the IE-MEI method and proposes a new formulation for high-loss dielectric piecewise-homogeneous media. The aim of this work is to assess if the fast attenuation of fields in highly lossy media helps in ...

    • Enhanced dielectric performance of a block copolymer-polythiophene nanocomposite 

      Pérez Madrigal, Mª del Mar; Ochoa Guerrero, Diego A.; García García, José Eduardo; Armelín Diggroc, Elaine Aparecida; Alemán Llansó, Carlos (2016-09-15)
      Article
      Open Access
      Dielectric elastomer actuators (DEAs) transform electrical energy into mechanical work. However, despite displaying exceptional features, the low permittivity of elastomers restricts their application. Hence, to overcome ...

    • Evaluation of the LIPP method for determining the space charge profile in poled dielectrics 

      Parsa, Seyedeh Elaheh (Universitat Politècnica de Catalunya, 2013-12-11)
      Master thesis
      Open Access
      [ANGLÈS] The determination of the charge profile in corona-poled or electrode-poled samples is a key step in many dielectric studies. The purpose of this work is to evaluate the feasibility of developing a laser induced ...

    • EWOD using nonaqueous liquids 

      Ahmadi, Maziar; Bermejo Broto, Sandra; Castañer Muñoz, Luis María (2015-04-18)
      Article
      Open Access
      Electrowetting on Dielectric (EWOD) has been studied for more than a decade and used for different applications but still there are few works on non-aqueous liquids such as mixtures of polyols. We have found that significant ...

    • Flexoelectric effect in non-homogenous dielectrics 

      Serrahima i Serra, Sergi (Universitat Politècnica de Catalunya, 2022-06)
      Master thesis
      Open Access
      Flexoelectricity is a different electromechanical coupling without this material symmetry limitations, hence universal for all dielectrics. Flexoelectricity relies on symmetry breaking beyond the material chemistry by ...

    • Grid-robust discretization of integral equations in the electromagnetic scattering analysis of homogeneous targets with geometric singularities 

      Úbeda Farré, Eduard; Sekulic, Ivan; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Restricted access - publisher's policy
      The conventional method-of-moment schemes of discretization for the scattering analysis of homogeneous targets, perfectly conducting or dielectric, rely on edge-based basis functions. This restricts the modelling of the ...

    • Influence of hydrogen bonds and temperature on dielectric properties 

      Ortiz de Urbina Viade, Jordi; Sesé Castel, Gemma (2016-07-06)
      Article
      Open Access
      Dielectric properties are evaluated by means of molecular dynamics simulations on two model systems made up of dipolar molecules. One of them mimics methanol, whereas the other differs from the former only in the ability ...

    • Influence of internal flexibility on the double glass transition in a series of odd non-symmetric liquid crystal dimers characterised by dielectric measurements 

      Diego Vives, José Antonio; Sellarès González, Jordi; Díez Berart, Sergio; Salud Puig, Josep; Cañadas Lorenzo, Juan Carlos; Mudarra López, Miguel; López Pérez, David Orencio; de la Fuente Lavin, Maria Rosario; Ros, M Blanca (2017-04-11)
      Article
      Open Access
      Dielectric measurements (thermally stimulated depolarisation currents and broadband dielectric spectroscopy) have been performed near the glass transition to study the glass transition on the odd non-symmetric liquid crystal ...

    • Influence of Mn-doping on phase transition characteristics and relaxor behaviour of lead lanthanum zirconate titanate ceramics 

      Pérez Delfín, Enrique; García García, José Eduardo; Vega García, A.; Guerrero, Fidel; Eiras, Jose A. (Elsevier, 2012-07)
      Article
      Restricted access - publisher's policy
      Changes in dielectric response features of lead lanthanum zirconate titanate (PLZT) ceramics by manganese addition are reported in the present work. Both the PLZT relaxor behaviour and the frequency dependence of the room ...

    • Influence of the type of rare-earth cation on electrical properties of Ba(Zr,Ti)O3 ceramics 

      Delgado del Toro, Ariel; Guerrero Peña, E; Leyet Ruiz, Yuri; Guerrero Zayas, Fidel; Mestres, Lourdes; Ochoa Guerrero, Diego A.; García García, José Eduardo (2011-02)
      Article
      Open Access
      En este artículo es investigado el efecto del radio iónico de diferentes cationes de tierras raras sobre las propiedades eléctricas del compuesto Ba(Zr,Ti)O3. La cerámica BaZr0.09Ti0.9O3 fue dopada con iones de Gd3+, Pr3+ ...

    • Medida de atenuación en guias dieléctricas mediante análisis de imágenes digitales 

      Nemiña, Juan; Canal Bienzobas, Fernando; Hernández Marco, Jordi; Moreno, Mauricio (1990)
      Conference report
      Open Access

    • Medida de la difracción de cilindros dieléctricos 

      Ferrando Bataller, Miquel (1987)
      Conference report
      Open Access
      In this paper we present a new experimental procedure for measuring scattered fields accurately. The transmitting and receiving probes are kept stationary and the object is scanned and rotated, or only scanned if it is ...

    • Metal-insulator-metal capacitor using electrosprayed nanoparticles 

      Véliz Noboa, Bremnen Marino; Bermejo Broto, Sandra; Coll Valentí, Arnau; Castañer Muñoz, Luis María (2014-07-07)
      Article
      Restricted access - publisher's policy
      An electrospray technique has been used to deposit SiO2 nanoparticles as insulator layer of a metal-insulator-metal device. Impedance spectroscopy measurements show that a 4.4 factor increase in capacitance is achieved ...

    • Microstructural features and functional properties of bilayered BaTiO3/BaTi1-xZrxO3 ceramics 

      Martins Amaral, Thiago; Antonelli, Eduardo; Ochoa Guerrero, Diego A.; García García, José Eduardo; Hernandes, Antonio Carlos (2015-04-01)
      Article
      Open Access
      Validity of mixture rule for dielectrics in series configuration and the correlation between microstructure and electrical properties in bilayered BaTiO3/BaTi1-xZrxO3 ceramics were studied. Samples were obtained from ...

    • Microstructure effects on BaTiO3/BaTi0.8Zr0.2O3 composites properties 

      Martins Amaral, Thiago; Antonelli, Eduardo; Ochoa Guerrero, Diego A.; García García, José Eduardo; Hernandes, Antonio Carlos (2016-05-15)
      Article
      Open Access
      The dielectric, pyroelectric and ferroelectric properties of bilayered BaTiO3/BaTi0.8Zr0.2O3 ceramics are described and correlated with their microstructure. Different sintering times are employed to change the microstructure ...

    • Nonlinear dielectric response of BaBi4Ti4O15 ceramics 

      Kumar, Sunil; Ochoa Guerrero, Diego A.; García García, José Eduardo; Varma, K.B.R (2013-02-05)
      Article
      Restricted access - publisher's policy
      Nonlinear dielectric response of BaBi 4 Ti 4 O 15 ceramics synthesized via the conventional solid-state reaction route has been monitored over a wide range of electric field strengths (E 0 = 0.5-5 kV/cm). Dielectric ...

    • Nonlinear dielectric response of BaBi4Ti4O15 ceramics 

      Kumar, Sunil; Ochoa Guerrero, Diego A.; García García, José Eduardo; Varma, K.B.R (American Institute of Physics (AIP), 2012)
      Conference lecture
      Restricted access - publisher's policy
      Nonlinear dielectric response of BaBi4Ti4O15 ceramics synthesized via the conventional solid-state reaction route has been monitored over a wide range of electric field strengths (E0 = 0.5-5 kV/cm). Dielectric permittivity ...

    • Phase transition characteristics and dielectric properties of rare-earth (La, Pr, Nd, Gd) doped Ba(Zr0.09Ti0.91)O-3 ceramics 

      Diez Betriu, Xavier; García García, José Eduardo; Ostos, Carlos; Boya Pimentel, Aurelio Urbano; Ochoa Guerrero, Diego A.; Mestres, Lourdes; Pérez Pérez, Rafael (2010-02-15)
      Article
      Restricted access - publisher's policy
      A-site deficient rare-earth doped barium zirconate titanate (BZT) ceramics (Ba1−yLn2y/3)Zr0.09Ti0.91O3 (Ln = La, Pr, Nd, Gd) are obtained by a modified solid-state reaction method. Perovskite-like single-phase compounds ...

    • Preisach modeling of temperature-dependent ferroelectric response of piezoceramics at sub-switching regime 

      Ochoa Guerrero, Diego A.; García García, José Eduardo (2016-04)
      Article
      Open Access
      The Preisach model is a classical method for describing nonlinear behavior in hysteretic systems. According to this model, a hysteretic system contains a collection of simple bistable units which are characterized by an ...