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Magnetoelastic instability of a long graphene nano-ribbon carrying electric current
, Article Advances in Applied Mathematics and Mechanics ; Vol. 6, issue. 3 , 2014 , pp. 299-306 ; ISSN: 20700733 ; Mohammadkhani, H ; Sharif University of Technology
Abstract
This paper aims at investigating the resonance frequencies and stability of a long Graphene Nano-Ribbon (GNR) carrying electric current. The governing equation of motion is obtained based on the Euler-Bernoulli beam model along with Hamilton's principle. The transverse force distribution on the GNR due to the interaction of the electric current with its own magnetic field is determined by the Biot-Savart and Lorentz force laws. Using Galerkin's method, the governing equation is solved and the effect of current strength and dimensions of the GNR on the stability and resonance frequencies are investigated
A low voltage, high speed current mode sample and hold for high precision applications
, Article 2005 European Conference on Circuit Theory and Design, Cork, 28 August 2005 through 2 September 2005 ; Volume 1 , 2005 , Pages 269-272 ; 0780390660 (ISBN); 9780780390669 (ISBN) ; Bakhtiar, M. S ; Sharif University of Technology
2005
Abstract
This paper presents a zero-voltage switching current mode sample and hold(S/H) circuit. The proposed S/H has 12 bit linearity at 180MHz sampling rate for 1.5v supply voltage. The S/H circuit is designed for 0.18μm CMOS technology
Heat transfer enhancement of Fe3O4 ferrofluids in the presence of magnetic field
, Article Journal of Magnetism and Magnetic Materials ; Volume 429 , 2017 , Pages 314-323 ; 03048853 (ISSN) ; Shahrokhi, M ; Molaei Dehkordi, A ; Abbasi, Z ; Sharif University of Technology
Elsevier B.V
2017
Abstract
In this article, three-dimensional (3D) forced-convection heat transfer of magnetic nanofluids in a pipe subject to constant wall heat flux in the presence of single or double permanent magnet(s) or current-carrying wire has been investigated and compared. In this regard, laminar fluid flow and equilibrium magnetization for the ferrofluid were considered. In addition, variations of magnetic field in different media were taken into account and the assumption of having a linear relationship of magnetization with applied magnetic field intensity was also relaxed. Effects of magnetic field intensity, nanoparticle volume fraction, Reynolds number value, and the type of magnetic field source...