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  1. The effect of pre-straining at intermediate temperatures on the mechanical behavior of high-bainite dual phase (HBDP) steels (Property)
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      , M.Sc. Thesis Sharif University of Technology (Author) ; Sarvari, Reza (Supervisor) ; Fardmanesh, Mehdi (Supervisor)
      Abstract
      As technology scales down Integrated Circuits operates at higher frequency and lower dimensions. Interconnects inside these chips operate at gigahertz frequencies and manometer range. As mean free path of electrons become comparable with wire dimensions and skin depth, first one will result in Size Effect and second one will result in Anomalous Skin Effect. In this thesis we are trying to characterize these effects. The MFP of electron for copper at room temperature is about 38nm and therefore neither Size effect nor ASE are measurable at room temperature with our available equipment. Hence, the idea is to measure ASE for copper wires at liquid nitrogen temperature (77K). We showed that ASE... 

      Optimal Multi-Level Interconnect Architecture for GSI Using Novel Solutions Replacing Copper

      , Ph.D. Dissertation Sharif University of Technology Kishani Farahani, Esmat (Author) ; Sarvari, Reza (Supervisor)
      Abstract
      Although a lot of research has been done on Carbon-based interconnect, there are many important questions unanswered. For example, there is no compact model for the resistance of bundle of CNTs at high frequencies, at which interconnects will be operating due to the scaling. Also there are many studies comparing CNT, GNR, and Cu wires but there is no study to show how much this will impact the design of a chip at today’s Giga Scale Integration. This comprehensive study should include chip performance, power dissipation and total number of metal levels. These two big questions are investigated in this dissertation. In the first part, high frequency behavior of CNT bundles is studied. A... 

      High quality factor RF inductors using low loss conductor featured with skin effect suppression for standard CMOS/BiCMOS

      , Article Proceedings - Electronic Components and Technology Conference, 31 May 2011 through 3 June 2011 ; June , 2011 , Pages 163-168 ; 05695503 (ISSN) ; 9781612844978 (ISBN) Iramnaaz, I ; Sandoval, T ; Zhuang, Y ; Schellevis, H ; Rejaei, B ; Sharif University of Technology
      2011
      Abstract
      Integrated on-chip inductors with high quality factors are demonstrated using a low loss artificial conductor technology. This concept is based on an artificial layered meta-material comprising a bi-layered Ni 80Fe 20/Cu superlattice. By properly tailoring the thickness ratio between the non-magnetic and magnetic metallic layers, the skin effects can be effectively suppressed within a wide frequency range, and can be tuned to a minimum at the frequency of interest up to 67 GHz. The quality factor has been increased by 41% of a 2nH inductor at 14.5GHz. The bandwidth of skin effect suppression is obtained between 10-18 GHz  

      Capture zone of a partially penetrating well with skin effects in confined aquifers

      , Article Transport in Porous Media ; Volume 91, Issue 2 , January , 2012 , Pages 437-457 ; 01693913 (ISSN) Ataie Ashtiani, B ; Shafei, B ; Rashidian Dezfouli, H ; Mohamadzadeh, M ; Sharif University of Technology
      2012
      Abstract
      The analysis of the capture zone of wells is useful to design pumping systems and wellhead protection programs. In this study, an analytical solution for the head distribution of a partially penetrating well, and semi-analytical methods to determine the geometry of the capture surface are presented. The analytical solution is derived based on an infinitesimal radius under a constant pumping rate in a two-zone confined aquifer. Using the developed solution, a sensitivity analysis is performed to study the influence of skin on the drawdown, location of the stagnation point, maximum horizontal and vertical extent of the capture surface. The results show the efficiency of a partially penetrating... 

      Compact closed form model for skin and proximity effect in multiwall carbon nanotube bundles as GSI interconnects

      , Article IEEE Transactions on Electron Devices ; Vol. 61, issue. 8 , July , 2014 , p. 2899-2904 Farahani, E. K ; Sarvari, R ; Sharif University of Technology
      Abstract
      Closed form model for skin and proximity effect is necessary for GSI interconnects. In this paper, exact formulation for current distribution inside multiwall carbon nanotube (MWCNT) bundles is derived using multiconductor transmission line model. The current distribution is different from copper wires and it is geometry dependent because of kinetic inductance and quantum capacitance. This current distribution is used to compute and formulate high frequency resistance of MWCNT bundles  

      Accurate numerical model for surface scattering, grain boundary scattering, and anomalous skin effect of copper wires

      , Article Proceedings - Winter Simulation Conference ; January , 2013 , Pages 209-210 ; 08917736 (ISSN) ; 9781467348416 (ISBN) Abbaspour, E ; Sarvari, R ; Akbarzadeh, A ; Rostami, M ; Sharif University of Technology
      2013
      Abstract
      In this paper we have studied both DC size effect and anomalous skin effect caused by surface and grain boundary scattering on the resistivity of Cu thin films by a Monte Carlo method. Contribution of each scattering mechanism and the interaction between them are analyzed separately. A simple and fast numerical recursive method is also introduced to guess the structure of electric field and distribution of current inside the thin film to evaluate the surface resistance instead of complicated analytical formulas  
    Total 6 records