Search for: structural-topologies
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    Hybrid topological magnon-phonon modes in ferromagnetic honeycomb and kagome lattices

    , Article Physical Review B ; Volume 104, Issue 4 , 2021 ; 24699950 (ISSN) Sheikhi, B ; Kargarian, M ; Langari, A ; Sharif University of Technology
    American Physical Society  2021
    Magnons and phonons are two fundamental neutral excitations of magnetically ordered materials which can significantly dominate the low-energy thermal properties. In this work we study the interplay of magnons and phonons in honeycomb and kagome lattices. When the mirror reflection with respect to the magnetic ordering direction is broken, the symmetry-allowed in-plane Dzyaloshinskii-Moriya (DM) interaction will couple the magnons to the phonons and the magnon-polaron states are formed. Besides, both lattice structures also allow for an out-of-plane DM interaction rendering the uncoupled magnons to be topological. Our aim is to study the interplay of such topological magnons with phonons. We... 

    Some properties of WK-recursive and swapped networks

    , Article 5th International Symposium on Parallel and Distributed Processing and Applications, ISPA 2007, Niagara Falls, 29 August 2007 through 31 August 2007 ; Volume 4742 LNCS , 2007 , Pages 856-867 ; 03029743 (ISSN); 3540747419 (ISBN); 9783540747413 (ISBN) Imani, N ; Sarbazi Azad, H ; Zomaya, A. Y ; Sharif University of Technology
    Springer Verlag  2007
    The surface area which is defined as the number of vertices at a given distance from a base vertex of a graph is considered to be as one of the most useful yet abstract combinatorial properties of a graph. The applicability of surface area spans many problem spaces such as those in parallel and distributed computing. These problems normally involve combinatorial analysis of underlying graph structures (e.g., spanning tree construction, minimum broadcast algorithms, efficient VLSI layout, performance modeling). In this paper, we focus on the problem of finding the surface area of a class of popular graphs, namely the family of WK-recursive and swapped networks. These are attractive networks... 

    Prediction of shape and internal structure of the proximal femur using a modified level set method for structural topology optimisation

    , Article Computer Methods in Biomechanics and Biomedical Engineering ; Volume 15, Issue 8 , 2012 , Pages 835-844 ; 10255842 (ISSN) Bahari, M. K ; Farahmand, F ; Rouhi, G ; Movahhedy, M. R ; Sharif University of Technology
    A computational framework was developed to simulate the bone remodelling process as a structural topology optimisation problem. The mathematical formulation of the Level Set technique was extended and then implemented into a coronal plane model of the proximal femur to simulate the remodelling of internal structure and external geometry of bone into the optimal state. Results indicated that the proposed approach could reasonably mimic the major geometrical and material features of the natural bone. Simulation of the internal bone remodelling on the typical gross shape of the proximal femur, resulted in a density distribution pattern with good consistency with that of the natural bone. When...