Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Subject: search.filters.subject.Transport propertiesWoS Q: search.filters.wosQuartile.Q1

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  • Article
    Citation - WoS: 21
    Citation - Scopus: 22
    First-Principle Phonon Transport Properties of Nanoscale Graphene Grain Boundaries
    (John Wiley and Sons Inc., 2018) Sandonas, Leonardo Medrano; Sevinçli, Haldun; Gutierrez, Rafael; Cuniberti, Gianaurelio
    The integrity of phonon transport properties of large graphene (linear and curved) grain boundaries (GBs) is investigated under the influence of structural and dynamical disorder. To do this, density functional tight-binding (DFTB) method is combined with atomistic Green's function technique. The results show that curved GBs have lower thermal conductance than linear GBs. Its magnitude depends on the length of the curvature and out-of-plane structural distortions at the boundary, having stronger influence the latter one. Moreover, it is found that by increasing the defects at the boundary, the transport properties can strongly be reduced in comparison to the effect produced by heating up the boundary region. This is due to the large reduction of the phonon transmission for in-plane and out-of-plane vibrational modes after increasing the structural disorder in the GBs.
  • Article
    Citation - WoS: 15
    Citation - Scopus: 16
    The Nearly-Optimal Petrov-Galerkin Method for Convection-Diffusion Problems
    (Elsevier Ltd., 2003) Neslitürk, Ali İhsan; Harari, Isaac
    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.