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A three-winding coupled-inductor high step-up boost converter with an active-clamp circuit
, Article 12th Power Electronics, Drive Systems, and Technologies Conference, PEDSTC 2021, 2 February 2021 through 4 February 2021 ; 2021 ; 9780738111971 (ISBN) ; Beiranvand, R ; Zolghadri, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
A new high step-up boost converter with an active clamp circuit to eliminate voltage spike caused by leakage inductor is introduced in this paper. The introduced power converter has a high voltage gain for variable input voltage from 48V to 80V. Since both main and auxiliary switches turn on with zero voltage switching (ZVS) and all the diodes turn off under zero current switching (ZCS) condition, switching losses and EMI noises are strongly degraded. Therefore, the converter's efficiency is improved significantly. Simulation results show a 96.4% peak efficiency and 95.4% average efficiency. The proposed topology is suitable for low-input-voltage and low-output power applications such as...
A new high step-up interleaved LLC converter
, Article 12th Power Electronics, Drive Systems, and Technologies Conference, PEDSTC 2021, 2 February 2021 through 4 February 2021 ; 2021 ; 9780738111971 (ISBN) ; Beiranvand, R ; Zolghadri, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
In this study, a new LLC resonant converter for high-voltage high-power applications is introduced. The introduced power converter is a two-phase interleaved full-bridge based that uses a transformer with secondary and tertiary windings to obtain higher output voltage. Zero voltage switching (ZVS) at MOSFETs turn on and zero current switching (ZCS) for all the output diodes at turn off are achieved for a wide range of input voltage (100 V-200 V) and output power (200 W-1500 W) variations. Simulation results show a 95% peak efficiency. © 2021 IEEE
A lightweight mutual authentication scheme for vanets between vehicles and RSUs
, Article ISeCure ; Volume 15, Issue 3 , 2023 , Pages 77-89 ; 20082045 (ISSN) ; Mohajeri, J ; Salmasizadeh, M ; Sharif University of Technology
Iranian Society of Cryptology
2023
Abstract
Vehicular Ad-hoc Networks (VANETs) have emerged as part of Intelligent Transportation Systems (ITS), offering the potential to enhance passenger and driver safety, as well as driving conditions. However, VANETs face significant security challenges and various attacks due to their wireless nature and operation in free space. Mutual authentication between vehicles and RSUs is one of the most, if not the most, critical security requirements in VANETs. In this process, maintaining resource authenticity, data authenticity and preserving users’ privacy, are key concerns. This paper proposes a pseudonym-based authentication scheme for VANETs, built upon existing approaches. The proposed scheme not...
Designing a sustainable reverse supply chain network for COVID-19 vaccine waste under uncertainty
, Article Computers and Industrial Engineering ; Volume 174 , 2022 ; 03608352 (ISSN) ; Fallahi, A ; Varmazyar, M ; Fathi, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
The vast nationwide COVID-19 vaccination programs are implemented in many countries worldwide. Mass vaccination is causing a rapid increase in infectious and non-infectious vaccine wastes, potentially posing a severe threat if there is no well-organized management plan. This paper develops a mixed-integer mathematical programming model to design a COVID-19 vaccine waste reverse supply chain (CVWRSC) for the first time. The presented problem is based on minimizing the system's total cost and carbon emission. The uncertainty in the tendency rate of vaccination is considered, and a robust optimization approach is used to deal with it, where an interactive fuzzy approach converts the model into...
Comparison of ultrasonic wave radiation effects on asphaltene aggregation in toluene-pentane mixture between heavy and extra heavy crude oils
, Article Journal of Energy Resources Technology, Transactions of the ASME ; Volume 134, Issue 2 , 2012 ; 01950738 (ISSN) ; Najafi, I ; Ghazanfari, M. H ; Amani, M ; Sharif University of Technology
2012
Abstract
In this study, it is aimed to compare the efficiency of ultrasonic wave technology on asphaltene flocculation inhibition of crude oils with different American Petroleum Institute (API) gravities. A set of confocal microscopy test is performed and a series of statistical analysis is done. According to the results of this study, there is an optimum radiation time for both crudes at which the viscosity and the flocculation rate of asphaltenic crude oils reduces to its minimum. This optimum appears at later times of radiation for extra heavy oil. Also, it is shown that the rate of changes in the properties measured in this study is sharper for extra heavy crude oil. It could be concluded that...
A mathematical and experimental analysis of role of ultrasonic wave radiation on relative permeabilties in gravity drain
, Article 73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 ; Volume 7 , May , 2011 , Pages 5104-5108 ; 9781617829666 (ISBN) ; Keshavarzi, B ; Ghazanfari, M ; Ghotbi, C ; Amani, M ; Sharif University of Technology
Society of Petroleum Engineers
2011
Abstract
This work concerns with experimental and analytical investigation of role of ultrasonic wave radiation in relative permeability of both wetting and non-wetting phases in a free gravity drainage process in porous media under the influence of ultrasonic wave. Glass beads ranged from 70 to 100 mesh sizes were packed and used in the tests. The working fluids consist of distilled water, kerosene and Doroud and Paidar crude oils as wetting and air as non-wetting phase. The measured oil recovery data along with Hagoort (1984) backward methodology were used to determine and to compare the relative permeability of wetting phases in presence and absence of ultrasonic radiation. In addition, the...
Effect of material and population on the delivery of nanoparticles to an atherosclerotic plaque: a patient-specific in silico study
, Article Langmuir ; Volume 37, Issue 4 , 2021 , Pages 1551-1562 ; 07437463 (ISSN) ; Shamloo, A ; Barzegar, S ; Forouzandehmehr, M ; Sharif University of Technology
American Chemical Society
2021
Abstract
Coronary artery disease (CAD) is the prevalent reason of mortality all around the world. Targeting CAD, specifically atherosclerosis, with controlled delivery of micro and nanoparticles, as drug carriers, is a very proficient approach. In this work, a patient-specific and realistic model of an atherosclerotic plaque in the left anterior descending (LAD) artery was created by image-processing of CT-scan images and implementing a finite-element mesh. Next, a fluid-solid interaction simulation considering the physiological boundary conditions was conducted. By considering the simulated force fields and particle-particle interactions, the correlation between injected particles at each cardiac...
Deep federated learning-based privacy-preserving wind power forecasting
, Article IEEE Access ; Volume 11 , 2023 , Pages 39521-39530 ; 21693536 (ISSN) ; Talaei, M ; Sadipour, M ; Moradi Amani, A ; Jalili, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2023
Abstract
Given the growing installed capacity, wind energy will exert a profound impact on the flexibility of modern energy systems. Wind power forecasting is a practical solution for dealing with the attributed variations and uncertainties, balancing supply and demand, and improving the reliability of the system. To achieve more accurate and generalizable forecast models, comprehensive data sets, supplied by multiple wind farms owing to their spatio-temporal dependencies, are required. In addition, data aggregation/collaboration across many wind farms scattered around a country is difficult, if not impossible, due to complex administrative processes, industry competition, and data privacy and...
Modeling the kinetics of asphaltene flocculation in toluene-pentane systems for the case of sonicated crude oils
, Article Scientia Iranica ; Volume 20, Issue 3 , June , 2013 , Pages 611-616 ; 10263098 (ISSN) ; Tavakolian, M ; Najafi, I ; Ghazanfari, M. H ; Taghikhania, V ; Amani, M ; Sharif University of Technology
2013
Abstract
This work is concerned with the monitoring of ultrasound effects on inhibition, as well as the reversible kinetics modeling of asphaltene flocculation in toluene-n-alkane systems, which has been rarely reported in the literature. A crude oil sample was exposed to ultrasound waves, and then the colloidal structural evolutions of flocculated asphaltene particles induced by addition of n-alkane were studied, using a confocal microscopy. Observations confirmed that radiation of ultrasound can change the irreversibility of asphaltene flocculation in crude oil. To interpret the kinetics of asphaltene flock aggregation, the Smoluchowski model was used, and the time dependent size distribution of...
Stability of Cantilevered Beams Subjected to Random Follower Forces
, M.Sc. Thesis Sharif University of Technology ; Haddadpour, Hassan (Supervisor)
Abstract
In Mechanical systems there is always possibility of statical and dynamical following force. These forces are generated due to aerodynamic pressure, temperature gradient, and jet thrusters. In unstabel systems, if the value of this force exceeds a certaim amount the system becomes unstable. This value is called as critical force. In order to analyse these systems, fisrt of all, the governing dynamic equations are obtained by using the Galerkin-Ritz method. Then, by utilising the modal analysis, these equation are uncoupled. And then, the Ito set of equations are derived. By utilising the Lyapanov method, Ito equations are transfered to another state. and using the fokker-planc equation the...
A System Dynamics Model to Find Optimal Policies for competition and Development of Online Question and Answer Knowledge Markets
, M.Sc. Thesis Sharif University of Technology ; Kianfar, Farhad (Supervisor)
Abstract
Knowledge markets where knowledge transactions take place are today see increasingly expansion by influences of the Internet and the importance of knowledge. A competitive space, thus, has been placed among different enterprises step in knowledge markets. With no exception to this general rule, one of these markets covers online question – answer knowledge market. Google Answers is a proposed website in this area which, although being of interest in recent decades, its activities ended in 2006 for several reasons. Significantly, these markets consist of many factors with interrelated effects on each other and this leads to complexity of systems. Therefore, in order to study these markets, it...
Implementation of SVM framework to estimate PVT properties of reservoir oil
, Article Fluid Phase Equilibria ; Volume 346 , May , 2013 , Pages 25-32 ; 03783812 (ISSN) ; Arabloo, M ; Chamkalani, A ; Amani, M ; Zargari, M. H ; Adelzadeh, M. R ; Sharif University of Technology
2013
Abstract
Through this work, a novel mathematical-based approach was proposed to develop reliable models for calculation of PVT properties of crude oils at various reservoir conditions. For this purpose, a new soft computing approach namely Least Square Support Vector Machine (LSSVM) modeling optimized with Coupled Simulated Annealing (CSA) optimization technique was implemented. The constructed models are evaluated by carrying out extensive experimental data reported in open literature. Results obtained by the proposed models were compared with the corresponding experimental values. Moreover, in-depth comparative studies have been carried out between these models and all other predictive models. The...
Investigation of low frequency elastic wave application for fluid flow percolation enhancement in fractured porous media
, Article Petroleum Science and Technology ; Volume 31, Issue 11 , 2013 , Pages 1159-1167 ; 10916466 (ISSN) ; Karimi, R ; Najafi, I ; Ghazanfari, M. H ; Amani, M ; Ghotbi, C ; Sharif University of Technology
2013
Abstract
In recent years, some numerical models have been proposed to investigate the effects of the elastic wave such as ultrasonic on fluid flow behavior in porous media. Nevertheless, none of these models are applicable to the fractured reservoirs, especially when the fluid is a Bingham plastic. In this work, the model proposed by P. P. Iassonov and I. A. Beresnev (2003) for flow under exposure of elastic wave in nonfractured porous media is considered and used for development of a new model of steady state flow of a Bingham plastic fluid in fractured reservoirs. The Kazemi's "block and fracture" model assuming negligible vertical permeability in blocks is considered for modeling. In addition,...
Dioxo and oxo-peroxo molybdenum(VI) complexes bearing salicylidene 2-picoloyl hydrazone: Structures and catalytic performances
, Article Polyhedron ; Volume 53 , 2013 , Pages 223-229 ; 02775387 (ISSN) ; Zare, M ; Amani, V ; Ellern, A ; Keith Woo, L ; Sharif University of Technology
2013
Abstract
Molybdenum complexes bearing a salicylidene 2-picoloyl hydrazone ligand have been synthesized and characterized. The salicylidene 2-picoloyl hydrazone ligand (H2sal-phz) was prepared by reaction of picoloyl hydrazine with salicylaldehyde. Reaction of H2sal-phz with MoO2(acac) 2 generates the dioxo molybdenum complex MoO2(sal-phz) (CH3OH). Treatment of MoO3 in the presence of H 2O2 with H2sal-phz produces the oxo-peroxo molybdenum(VI) complex MoO(O2)(sal-phz)(CH3OH). The new compounds were characterized by 1H NMR and IR spectroscopies, and elemental analysis. The complexes were also characterized by single crystal X-ray diffraction crystallography. The complexes were evaluated for epoxidation...
Investigation of the reaction of dithiocarbamic acid salts with trimethyl orthoformate and styrene epoxide
, Article Tetrahedron Letters ; Volume 56, Issue 51 , December , 2015 , Pages 7124-7127 ; 00404039 (ISSN) ; Hajilou Shayegan, M ; Poshteh, S. S ; Amani, V ; Notash, B ; Hashemi, M. M ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
The reaction of dithiocarbamic acid salts with trimethyl orthoformate in the presence of BF3·OEt2 was investigated to give 4-(N,N-dialkyldithiocarbamato)-2-dialkyliminio-1,3-dithietane tetrafluoroborates in good yields. Additionally, a one-pot procedure for the synthesis of 2-iminium-1,3-dithiolanes from the BF3·OEt2 catalyzed reaction of dithiocarbamic acid salts with styrene epoxide is described
Buckling behavior of composite triangular plates
, Article International Journal of GEOMATE ; Volume 2, Issue 2 , 2012 , Pages 253-260 ; 21862982 (ISSN) ; Heydarnia, E ; Amani, P ; Sharif University of Technology
GEOMATE International Society
2012
Abstract
This paper is to do a brief research on the buckling behavior of composite triangular plates with various edge boundary conditions and in-plane loads. It may be regarded as a right and simple numerical method for the analysis of composite triangular thin plate using the natural Area coordinates. Previous studies on the solution of triangular plates with different boundary conditions were mostly based on the Rayleigh-Ritz principle which is performed in the Cartesian coordinate. In this method, the energy functional of a general triangular plate is derived and the Rayleigh-Ritz method is utilized to derive the governing eigenvalue equation for the buckling problem. The geometry is presented...
Treatment of wastewatercontaining carbohydrates usingpichia saitoi culture
, Article International Journal of Engineering, Transactions B: Applications ; Volume 17, Issue 3 , 2004 , Pages 209-218 ; 1728-144X (ISSN) ; Yaghmaei, S ; Maghsoodi, V ; Sharif University of Technology
National Research Center of Medical Sciences
2004
Abstract
Treatment of wastewater containing carbohydrates by Pichia saitoi growing on beet molasses was investigated in a well-mixed continuous tank as an alternative to bulking control. The yeast strain that used in this work was isolated from non-alcoholic beverage industrial wastewater, with a view on TOC removal compared with other strains in previous study.In this research the isolated yeast showed high COD and TOC removal at three hydraulic retention times, HRT= 48, 24 and 18 hours.Maximum COD and TOC reductions were obtained at HRT=48 hours, which were 96% and 88%, respectively.The influent COD and TOC were 2500 and 148 mg/1, respectively.The pH maintained for synthetic wastewater was about...
Synthesis and characterization of metal dithiocarbamate derivatives of 3-((pyridin-2-yl)methylamino)propanenitrile: Crystal structure of [3-((pyridin-2-yl)methylamino)propanenitrile dithiocarbamato] nickel(II)
, Article Polyhedron ; Volume 102 , 2015 , Pages 643-648 ; 02775387 (ISSN) ; Torabi, S ; Amani, V ; Notash, B ; Saidi, M. R ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
Four metal dithiocarbamate complexes (Zn, Ni, Hg and Sn) based on an amine containing pyridyl and nitrile groups, 3-((pyridin-2-yl)methylamino)propanenitrile, were prepared and characterized by their elemental analysis, spectroscopic data (such as IR, 1H and 13C NMR), TGA analysis and X-ray crystallography of the Ni(II) complex. The presence of a band in the 1000 cm-1 region in the IR spectra, without any splitting, confirms the symmetrical bidentate bonding mode of the dithiocarbamate ligand. Also, the short thioureide C=N distance in the X-ray analysis of the Ni complex confirms the delocalization of π electrons over the S2CN moiety and strong double bond character between the carbon and...
Optimization of catalytic activity of sulfated titania for efficient synthesis of isoamyl acetate by response surface methodology
, Article Monatshefte fur Chemie ; Volume 146, Issue 12 , December , 2015 , Pages 1949-1957 ; 00269247 (ISSN) ; Sadehvand, M ; Azad, A ; Dekamin, M. G ; Jalali Heravi, M ; Mollahosseini, A ; Amani, M ; Tadjarodi, A ; Sharif University of Technology
Springer-Verlag Wien
2015
Abstract
TiO2 nanoparticles were synthesized by sol-gel method using titanium tetraisopropoxide. Sulfate ions were introduced on the titania by impregnation method using sulfuric acid as precursor of sulfate ions. Fourier transform infrared and energy-dispersive X-ray spectroscopy, X-ray fluorescence as well as X-ray diffraction, scanning electron microscopy, and BET methods were used for the characterization of the obtained nanoparticles. The esterification of isoamyl alcohol with acetic acid was investigated to prove the catalytic activity of the TiO2 nanoparticles under solvent-free conditions. Response surface methodology was applied to optimize the effect of some parameters such as the molar...
A rapid and convenient synthesis of gem-bis(dithiocarbamate) derivatives from primary aliphatic amines, carbon disulfide, and aromatic aldehydes using boron trifluoride-diethyl etherate
, Article Tetrahedron Letters ; Vol. 55, Issue. 25 , 2014 , Pages 3572-3575 ; ISSN: 00404039 ; Ghiyaei, A. G. G ; Notash, B ; Shayegan, M. H ; Amani, V ; Sharif University of Technology
2014
Abstract
An efficient route for the synthesis of gem-bis(dithiocarbamate) derivatives is developed using dithiocarbamic acid salts generated from primary aliphatic amines and CS2. The method offers high yields, employs mild reaction conditions, and demonstrates excellent functional group compatibility. The structures of the products were confirmed spectroscopically and by X-ray analysis