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    Analytical and semi-analytical kinetics models for design and optimization of double-resistance resin in pulp and carbon in pulp processes with both reversible and irreversible nature

    , Article Canadian Journal of Chemical Engineering ; Volume 96, Issue 11 , 2018 , Pages 2461-2474 ; 00084034 (ISSN) Naderi, A ; Outokesh, M ; Ahmadian Koudakan, P ; Ghoddocynejad, D ; Saberyan, K ; Sharif University of Technology
    Wiley-Liss Inc  2018
    Abstract
    The current study was aimed at developing a package of “model + algorithm” for the design of resin in pulp (RIP) and carbon in pulp (CIP) processes of gold, uranium, and base metals. For this purpose, we first formulated a double-resistance model for irreversible adsorption (accompanied by chemical reaction) in CSTRs, and modified the McKay et al. semi-analytical model for reversible uptake in a similar system. We then devised two algorithms for the design and optimization of reversible and irreversible RIP and CIP cascades. The developed algorithms were applied on the extraction of copper, uranium, and gold. The packages are able to specify the optimum number of stages, reactor volume (V),... 

    Subdomain model for predicting the performance of linear resolver considering end effect and slotting effect

    , Article IEEE Sensors Journal ; Volume 20, Issue 24 , 2020 , Pages 14747-14755 Paymozd, A ; Saneie, H ; Nasiri Gheidari, Z ; Tootoonchian, F ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    Abstract
    Linear position sensors are essential parts of linear motion control systems. Among different linear sensors, linear resolvers are an appropriate choice for harsh environments. Design optimization of linear resolvers needs an accurate, but computationally fast model for their performance prediction. Slotting effect of the cores and end effect are two important phenomena that must be accurately involved in the model to ensure its reliable results. Therefore, in this paper a semi-analytical model based on subdomain modeling technique is proposed for linear resolvers. Then, according to the developed model, the induced voltages in the signal windings of the resolver are calculated and... 

    Fast spectral solutions of the double-gyre problem in a turbulent flow regime

    , Article Applied Mathematical Modelling ; Volume 66 , 2019 , Pages 745-767 ; 0307904X (ISSN) Naghibi, S. E ; Karabasov, S. A ; Jalali, M. A ; Sadati, S. M. H ; Sharif University of Technology
    Elsevier Inc  2019
    Abstract
    Several semi-analytical models are considered for a double-gyre problem in a turbulent flow regime for which a reference fully numerical eddy-resolving solution is obtained. The semi-analytical models correspond to solving the depth-averaged Navier–Stokes equations using the spectral Galerkin approach. The robustness of the linear and Smagorinsky eddy-viscosity models for turbulent diffusion approximation is investigated. To capture essential properties of the double-gyre configuration, such as the integral kinetic energy, the integral angular momentum, and the jet mean-flow distribution, an improved semi-analytical model is suggested that is inspired by the idea of scale decomposition... 

    A new semi-analytical modeling of steam-assisted gravity drainage in heavy oil reservoirs

    , Article Journal of Petroleum Science and Engineering ; Volume 69, Issue 3-4 , 2009 , Pages 261-270 ; 09204105 (ISSN) Alali, N ; Pishvaie, M. R ; Jabbari, H ; Sharif University of Technology
    Abstract
    Thermal recovery by steam injection has proven to be an effective means of recovering heavy oil. Forecasts of reservoir response to the application of steam are necessary before starting a steam drive project. Thermal numerical models are available to provide forecasts. However, these models are expensive and consume a great deal of computer time. An alternative to numerical modeling is to use a semi-analytical model. The objective of the current study was to investigate thermal applications of horizontal wells for displacement and gravity drainage processes using analytical modeling as well as reservoir simulation. The main novelties presented in the paper are: a) the transient temperature... 

    Dynamic behavior of electric field in the microrings in the presence of Kerr and two-photon absorption

    , Article Proceedings of SPIE - The International Society for Optical Engineering, 7 April 2008 through 10 April 2008, Strasbourg ; Volume 6996 , 2008 ; 0277786X (ISSN) ; 9780819471949 (ISBN) Keyvaninia, S ; Karvar, M ; Bahrampour, A ; Sharif University of Technology
    2008
    Abstract
    This paper a simple semi-analytical model for calculation of the time evolution and spatial variation of the electric field in microring resonators in the presence of The Kerr effect and two-photon absorption (TPA) is presented. The theoretical analysis is based on the delayed feedback model, which is well known in microring theory. The model is applied to the Chalcogenide glass and AlGaAs microrings to study the Kerr and TPA effects on the spatial and temporal variation of electric field respectively across the microring. The effects of microring parameters and input signal shapes on the transient behavior are taken into consideration. It is shown that, the results are in good agreement...