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experimental-verification
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Entanglement swapping with local certification: Application to remote micromechanical resonators
, Article 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC ; 2013 ; 978-1-4799-0593-5 (ISBN) ; Pirandola, S ; Tombesi, P ; Vitali, D ; Sharif University of Technology
Abstract
Entanglement swapping allows to entangle two distant systems which never interacted. The standard protocol considers two distant users, Alice and Bob, each possessing a bipartite entangled system, R1B1 for Alice and R2B2 for Bob. The users send their systems B1 and B2 to an intermediate station (Charlie). Here an appropriate Bell measurement is made over the B systems and the outcome communicated back to Alice and Bob. As a result, the two remote systems R 1 and R2 become entangled. A delicate point is the experimental verification of the generated entanglement, which generally involves direct measurements on the two remote systems, R1 and R 2, followed by classical communications. A simple...
Experimental Verification of Nonlinear Analysis of Planar Truss under Static Loading by Neuro-modelers
, M.Sc. Thesis Sharif University of Technology ; Joghataie, Abdolreza (Supervisor)
Abstract
In the recent years, neural networks have been used to solve many problems in different fields, specifically in engineering problems. Neural networks have different applications in material science and structures including modeling stress-strain relationship of composite materials and static and dynamic analysis of structures. Recently, a new method called neuro-finite element has been developed for nonlinear static analysis of structures manufactured by one-dimensional elements. In this method, by investigating the load-deflection diagram of each element, it is possible to analyze and produce a load-deflection diagram for the whole structure using neural networks. This experimental study...
Pipe damper, Part II: Application to bridges
, Article Journal of Constructional Steel Research ; Volume 66, Issue 8-9 , 2010 , Pages 1096-1106 ; 0143974X (ISSN) ; Bagheri, S ; Sharif University of Technology
2010
Abstract
Theoretical and experimental verification of the pipe damper was investigated in Part I of the two companion papers. In this paper, the application of the pipe damper to structures is examined. In particular, single span slab-girder bridges are considered for analytical investigations. A practical detail for the installation of the pipe damper is introduced. Nonlinear dynamic time history analyses are conducted on bridges equipped with the pipe damper and the results are compared with ordinary bridges. Bridge span, ground motion and the pipe length are varied in the analyses. Results show that the pipe damper is a reliable and economical metallic-yielding device that can easily be installed...
On time-constant robust tuning of fractional order U+005B proportional derivative U+005D controllers
, Article IEEE/CAA Journal of Automatica Sinica ; 2017 ; 23299266 (ISSN) ; Tavazoei, M. S ; Sharif University of Technology
Abstract
This paper deals with analyzing a newly introduced method for tuning of fractional order U+005B proportional derivative U+005D U+0028 FO U+005B PD U+005D U+0029 controllers to be used in motion control. By using this tuning method, not only the phase margin and gain crossover frequency are adjustable, but also robustness to variations in the plant time-constant is guaranteed. Conditions on the values of control specifications U+0028 desired phase margin and gain crossover frequency U+0029 for solution existence in this tuning method are found. Also, the number of solutions is analytically determined in this study. Moreover, experimental verifications are presented to indicate the...
Effect of initial surface treatment on shot peening residual stress field: analytical approach with experimental verification
, Article International Journal of Mechanical Sciences ; Volume 137 , 2018 , Pages 171-181 ; 00207403 (ISSN) ; Farrahi, G. H ; Mahmoudi, A. H ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
Shot peening is the most common surface treatment employed to enhance the fatigue performance of structural metallic materials and often carried out after other surface treatments. This paper mainly focuses on the effects of initial conditions of surface such as initial stress filed and hardness profile on shot peening residual stress field. The residual stress distribution induced by shot peening is obtained using Hertzian contact theory and elastic–plastic evaluation after yielding occurred during impingement and rebound of shots. Elastic plastic calculations are performed using different hardening models considering Bauschinger effect. The present model is able to predict redistribution...
Cellular model of electroporated tissue for ultrasound RF data analysis
, Article 2009 International Conference on Advances in Computational Tools for Engineering Applications, ACTEA 2009, Beirut, 15 July 2009 through 17 July 2009 ; 2009 , Pages 652-655 ; 9781424438341 (ISBN) ; Zahedi, E ; National Instruments; MSC Software; Pro Mech ; Sharif University of Technology
2009
Abstract
Electroporation is permeabilization of the cell membrane, caused by an external electric field. Because of minimal thermal effects and minimal disturbance caused to tissue vasculature electroporation is becoming one of the methods of choice in tumor therapy. There has been no report indicating that reversible electroporation can be detected by ultrasound. In this work a cellular model for monitoring the electroporation process b; ultrasound RF signals is proposed. The density of aqueous pores with different sizes was found by applying the asymptotic model of electroporation and Smoluchowski equation. The cellular model was send to an ultrasound simulation program where pores were modeled by...
On time-constant robust tuning of fractional order proportional derivative controllers
, Article IEEE/CAA Journal of Automatica Sinica ; Volume 6, Issue 5 , 2019 , Pages 1179-1186 ; 23299266 (ISSN) ; Tavazoei, M. S ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
This paper deals with analyzing a newly introduced method for tuning of fractional order [proportional derivative] (FO[PD]) controllers to be used in motion control. By using this tuning method, not only the phase margin and gain crossover frequency are adjustable, but also robustness to variations in the plant time-constant is guaranteed. Conditions on the values of control specifications (desired phase margin and gain crossover frequency) for solution existence in this tuning method are found. Also, the number of solutions is analytically determined in this study. Moreover, experimental verifications are presented to indicate the applicability of the obtained results. © 2014 Chinese...
FPGA-based reconfigurable control for fault-tolerant back-to-back converter without redundancy
, Article IEEE Transactions on Industrial Electronics ; Volume 60, Issue 8 , May , 2013 , Pages 3360-3371 ; 02780046 (ISSN) ; Poure, P ; Saadate, S ; Zolghadri, M. R ; Sharif University of Technology
2013
Abstract
In this paper, an FPGA-based fault-tolerant back-to-back converter without redundancy is studied. Before fault occurrence, the fault-tolerant converter operates like a conventional back-to-back six-leg converter, and after the fault, it becomes a five-leg converter. Design, implementation, and experimental verification of an FPGA-based reconfigurable control strategy for this converter are discussed. This reconfigurable control strategy allows the continuous operation of the converter with minimum affection from a fault in one of the semiconductor switches. A very fast detection scheme is used to detect and locate the fault. Implementation of the fault detection and of the fully digital...
The effect of MPL permeability on water fluxes in PEM fuel cells: Experimental verification
, Article ECS Transactions, 9 October 2011 through 14 October 2011 ; Volume 41, Issue 1 , 2011 , Pages 521-538 ; 19385862 (ISSN) ; 9781607682547 (ISBN) ; Sharif University of Technology
2011
Abstract
The distribution of water fluxes is strongly influenced by the properties of the media adjacent to the cathode catalyst layer (CCL), viz. polymer electrolyte membrane (PEM) and gas diffusion media (GDM). We propose a model that is applied under varying humidification of the cathode feed gas, with water removal in liquid and vapor form. The model warrants the definition of a critical current density up to which water removal out of the CCL could proceed completely via vapor diffusion to the cathode side. Above the critical current density, excessive water generation leads to the build-up of an excess liquid pressure in the CCL, which drives hydraulic fluxes to PEM and GDM sides. Experimental...
Fatigue life estimation of spot welds using a crack propagation-based method with consideration of residual stresses effect
, Article Materials Science and Engineering A ; Volume 527, Issue 23 , 2010 , Pages 6359-6363 ; 09215093 (ISSN) ; Kokabi, A. H ; Sharif University of Technology
2010
Abstract
In the present paper, a crack propagation-based fatigue life estimation approach has been proposed for resistance spot welds. The presented approach also takes into account the effect of welding residual stresses. It can provide an accurate and systematic prediction of the life of spot weld joints with various dimensions and shapes. Experimental verification tests confirmed the validity of the calculations and good agreement was found between the theoretical predictions and experimental data
A nonlinear theoretical model for prediction of mechanical behavior of particulate composites and experimental verification of the model predictions
, Article Polymer Composites ; Volume 31, Issue 7 , August , 2010 , Pages 1150-1155 ; 02728397 (ISSN) ; Najafi, N. C ; Sharif University of Technology
2010
Abstract
A model for prediction the stress-strain behavior of particulate composite over wide ranges of filler concentration and composite deformation has been developed through combination of Anderson's and Yilmizer's model. The constitutive equations are extracted from first law of thermodynamic and nonlinear dilatational effects which are produced by filler-matrix debonding process. In addition to nonlinear behavior that has been resulted by filler-matrix debonding and was presented by Yilmizer, the formation and growing of void or cavitations has been also introduced in this model, whereas Anderson's model, most important reason for deviation of linear behavior is filler-matrix debonding and has...
Open-circuit switch fault tolerant wind energy conversion system based on six/five-leg reconfigurable converter
, Article Electric Power Systems Research ; Volume 137 , 2016 , Pages 104-112 ; 03787796 (ISSN) ; Saadate, S ; Poure, P ; Zolghadri, M ; Sharif University of Technology
Elsevier Ltd
2016
Abstract
In this paper, an FPGA-controlled fault tolerant back-to-back converter for DFIG-based wind energy conversion application is studied. Before an open-circuit failure in one of the semiconductors, the fault tolerant converter operates as a conventional back-to-back six-leg one. After the fault occurrence in one of the switches, the converter will continue its operation with the remaining five healthy legs. Design, implementation, simulation and experimental verification of a reconfigurable control strategy for the fault tolerant six/five leg converter used in wind energy conversion are discussed. The proposed reconfigurable control strategy allows the uninterrupted operation of the converter...
Comprehensive analytics for reliability evaluation of conventional isolated multiswitch PWM DC-DC converters
, Article IEEE Transactions on Power Electronics ; Volume 35, Issue 5 , 2020 , Pages 5254-5266 ; Panahandeh Esmaeelnia, F ; Fotuhi Firuzabad, M ; Tahami, F ; Tohidi, S ; Dehghanian, P ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
This article offers a holistic model and approach on reliability assessment of conventional isolated multiswitch pulsewidth modulation dc-dc (IMSDC-DC) power electronic converters with conventional half-bridge, full-bridge, and push-pull dc-dc topologies. The proposed reliability assessment analytics encapsulate correlated effects of several conditions (e.g., open- and short-circuit faults) and prevailing parameters (e.g., duty cycle, input voltage, output power, transformer turns ratio, voltage gain, switching frequency, operation time duration, and components characteristics) on the overall reliability performance of IMSDC-DC converters. Such insights are then harnessed within a Markov...
Drug release from ion-exchange microspheres: Mathematical modeling and experimental verification
, Article Biomaterials ; Volume 29, Issue 11 , 2008 , Pages 1654-1663 ; 01429612 (ISSN) ; Wu, X. Y ; Sharif University of Technology
2008
Abstract
This paper presents for the first time a mathematical model for a mechanism of controlled drug release involving both ion exchange and transient counter diffusion of a drug and counterions. Numerical analysis was conducted to study the effect of different factors on drug release kinetics including environmental condition, material properties, and design parameters. The concentration profiles of counterions and drug species, the moving front of ion exchange, and three distinct regions inside a microsphere, namely unextracted region, ion-exchange region and drug diffusion region, were revealed by model prediction. The numerical results indicated that the rate of drug release increased with an...
Drug loading onto ion-exchange microspheres: Modeling study and experimental verification
, Article Biomaterials ; Volume 27, Issue 19 , 2006 , Pages 3652-3662 ; 01429612 (ISSN) ; Wu, X. Y ; Sharif University of Technology
2006
Abstract
A new mathematical model was developed and an exact analytical solution without approximations of previous work was derived for the description of the kinetics and equilibrium characteristics of drug loading from a finite external solution onto ion-exchange microspheres. The influence of important parameters pertinent to material properties and loading conditions on the kinetics, efficiency, and equilibrium of drug loading was analyzed using the developed model and equations. The numerical results showed that the rate of drug loading increased with increasing initial drug concentration in the solution or with the relative volume of the external solution and the microsphere. The maximum...
Thermodynamic model for prediction of performance and emission characteristics of SI engine fuelled by gasoline and natural gas with experimental verification
, Article Journal of Mechanical Science and Technology ; Volume 26, Issue 7 , July , 2012 , Pages 2213-2225 ; 1738494X (ISSN) ; Asghar, H. A ; Asghar, M. A ; Sharif University of Technology
2012
Abstract
In this study, a thermodynamic cycle simulation of a conventional four-stroke SI engine has been carried out to predict the engine performance and emissions. The first law of thermodynamics has been applied to determine in-cylinder temperature and pressure as a function of crank angle. The Newton-Raphson method was used for the numerical solution of the equations. The non-differential form of equations resulted in the simplicity and ease of the solution to predict the engine performance. Two-zone model for the combustion process simulation has been used and the mass burning rate was predicted by simulating spherical propagation of the flame front. Also, temperature dependence of specific...