WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7150

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Publisher: search.filters.publisher.Elsevier Ltd.Subject: search.filters.subject.Transport properties

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  • Article
    Citation - WoS: 39
    Citation - Scopus: 40
    Investigation of the Variation in Weak-Link Profile of Yba 2cu3-Xagxo7 Superconductors by Ag Doping Concentration
    (Elsevier Ltd., 2004) Tepe, Mustafa; Abukay, Doğan; Koçoğlu, H.; Abukay, Doğan; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    The effect of Ag doping concentration on the microstructure, transport properties and weak-link profile of YBa2Cu3-xAg xO7-δ bulk superconducting compound was investigated through resistance-temperature (R-T), ac magnetic susceptibility (χ-T), scanning electron microscope (SEM), X-ray diffraction (XRD) and the critical current density (Jc) versus applied magnetic field (Jc-B) measurements. We used the additive method with cationic ratio of x=0.1-0.4 for the YBCO-Ag system. The change in the silver doping concentration slightly affected the transition temperatures (Tc,zero), whereas, the critical current densities (Jc) of the samples and their magnetic field (B) dependencies were noticeably affected. The improvement on the microstructural properties of YBCO bulk superconductors was observed in SEM analysis, the J c values increased and their magnetic field dependencies decreased with the increasing of Ag concentration up to x=0.2. As well as the current transport properties. Ag doping up to a certain amount produces texturing that gives rise to a modification in the weak-link profile resulting in an enhanced strength of flux pinning which causes an increase in the current carrying capacity.
  • Article
    Citation - WoS: 15
    Citation - Scopus: 16
    The Nearly-Optimal Petrov-Galerkin Method for Convection-Diffusion Problems
    (Elsevier Ltd., 2003) Neslitürk, Ali İhsan; Neslitürk, Ali İhsan; 04.02. Department of Mathematics; 04. Faculty of Science; 01. Izmir Institute of Technology
    The nearly-optimal Petrov-Galerkin (NOPG) method is employed to improve finite element computation of convection-dominated transport phenomena. The design of the NOPG method for convection-diffusion is based on consideration of the advective limit. Nonetheless, the resulting method is applicable to the entire admissible range of problem parameters. An investigation of the stability properties of this method leads to a coercivity inequality. The convergence features of the NOPG method for convection-diffusion are studied in an error analysis that is based on the stability estimates. The proposed method compares favorably to the performance of an established technique on several numerical tests.