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    Damage Detection in Steel Beams Subjected to Dynamic Loads Using Time Domain Response (Analytical & Experimental)

    , Ph.D. Dissertation Sharif University of Technology Fallahian, Saeed (Author) ; Joghataie, Abdolreza (Supervisor) ; Kazemi, Mohammad Taghi (Supervisor)
    Many structural systems may experience some local damage during their lifetime. If the local damage is not identified timely, it may lead to undesirable consequences. Vibration-based damage detection techniques of structures are global methods and are based on the assumption that damage alters both the physical properties, such as mass, stiffness and damping, as well as the dynamic properties of the structures. It is therefore feasible to utilize measured dynamic quantities, such as time histories, frequency response functions (FRFs) and modal parameters, from structural vibration to detect damage. Damage identification based on vibration characteristics is essentially a form of pattern... 

    Crosstalk stability analysis in multilayer graphene nanoribbon interconnects

    , Article Circuits, Systems, and Signal Processing ; Volume 32, Issue 6 , 2013 , Pages 2653-2666 ; 0278081X (ISSN) Akbari, L ; Faez, R ; Sharif University of Technology
    In this paper a time-domain response and Nyquist stability criterion to acquire dependence of degree of crosstalk relative stability based on transmission lines modeling (TLM) is investigated for coupled multilayer graphene nanoribbon (MLGNR) interconnects. This is the first instance that such an analysis has been presented for coupled MLGNR consisting of both capacitive and mutual-inductive couplings. The near-end and far-end outputs of coupled MLGNR individually are compared in two cases, with considering both couplings and without them (single MLGNR). It is observed that the near-end output of the system together with both couplings is more stable and at its far-end output, an induced... 

    Systematic computation of nonlinear bilateral dynamical systems with a novel low-power log-domain circuit

    , Article IEEE Transactions on Circuits and Systems I: Regular Papers ; Volume 64, Issue 8 , 2017 , Pages 2013-2025 ; 15498328 (ISSN) Jokar, E ; Soleimani, H ; Drakakis, E. M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2017
    Simulation of large-scale nonlinear dynamical systems on hardware with a high resemblance to their mathematical equivalents has been always a challenge in engineering. This paper presents a novel current-input current-output circuit supporting a systematic synthesis procedure of log-domain circuits capable of computing bilateral dynamical systems with considerably low power consumption and acceptable precision. Here, the application of the method is demonstrated by synthesizing four different case studies: 1) a relatively complex 2-D nonlinear neuron model; 2) a chaotic 3-D nonlinear dynamical system Lorenz attractor having arbitrary solutions for certain parameters; 3) a 2-D nonlinear Hopf... 

    FDTD analysis of distributed amplifiers based on the fully distributed model

    , Article 2007 Asia-Pacific Conference on Applied Electromagnetics, APACE2007, Melaka, 4 December 2007 through 6 December 2007 ; 2007 ; 1424414350 (ISBN); 9781424414352 (ISBN) Mirzavand, R ; Abdipour, A ; Shishegar, A. A ; Sharif University of Technology
    In this paper a wave approach has been introduced to study the performance of a distributed amplifier. The time domain response of a FET is obtained by means of the fully distributed model. By applying the procedure to a pi-gate GaAs MESFET, the S matrix is computed from time domain results over a frequency range of 2-20 GHz. Scattering parameters of gate and drain lines are extracted from three-dimensional FDTD simulation. The result obtained by this wave approach is compared with device lumped model and Quasi static approach of transmission line. © 2007 IEEE