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Alternating active-phase algorithm for multimaterial topology optimization problems: A 115-line MATLAB implementation
, Article Structural and Multidisciplinary Optimization ; Vol. 49, issue. 4 , April , 2014 , p. 621-642 ; Mohseni, S. M ; Sharif University of Technology
Abstract
A new algorithm for the solution of multimaterial topology optimization problems is introduced in the present study. The presented method is based on the splitting of a multiphase topology optimization problem into a series of binary phase topology optimization sub-problems which are solved partially, in a sequential manner, using a traditional binary phase topology optimization solver; internal solver. The coupling between these incomplete solutions is ensured using an outer iteration strategy based on the block coordinate descend method. The presented algorithm provides a general framework to extend the traditional binary phase topology optimization solvers for the solution of multiphase...
Phase morphology of polyblends of amorphous polycarbonate and semi-crystalline polyethylene terephthalate
, Article Iranian Polymer Journal (English Edition) ; Volume 11, Issue 3 , 2002 , Pages 151-157+209 ; 10261265 (ISSN) ; Mehrabzadeh, M ; Mohseni, S. S ; Sharif University of Technology
2002
Abstract
Phase morphology, state of compatibility and various properties of blends of polycarbonate (PC) with bottle-grade and fibre-grade polyethylene terephthalate (BPET and FPET, respectively) were investigated. It was found that these blends have two-phase separated morphology with partial miscibility. Scanning electron micrographs revealed separated domains of PC-rich and PET-rich zones. PC domains appear spherical increasing in size from 2 μm for PC20/FPET80 up to about 5 μm for PC60/FPET40 blend. Further increase in PC content up to 80% caused phase inversion in which FPET appears as finely dispersed domains in continuous PC matrix. Tg of PC-rich phase decreased from 153 deg;C for pure PC down...
Dynamics of magnetic nano-flake vortices in Newtonian fluids
, Article Journal of Magnetism and Magnetic Materials ; Volume 419 , 2016 , Pages 547-552 ; 03048853 (ISSN) ; Mohseni, S. M ; Khavasi, A ; Zibaii, M. I ; Movahed, S. M. S ; Jafari, G. R ; Sharif University of Technology
Elsevier
Abstract
We study the rotational motion of nano-flake ferromagnetic disks suspended in a Newtonian fluid, as a potential material owing the vortex-like magnetic configuration. Using analytical expressions for hydrodynamic, magnetic and Brownian torques, the stochastic angular momentum equation is determined in the dilute limit conditions under applied magnetic field. Results are compared against experimental ones and excellent agreement is observed. We also estimate the uncertainty in the orientation of the disks due to the Brownian torque when an external magnetic field aligns them. Interestingly, this uncertainty is roughly proportional to the ratio of thermal energy of fluid to the magnetic energy...
Tunable bandgap and spin-orbit coupling by composition control of MoS2 and MoOx (x = 2 and 3) thin film compounds
, Article Materials and Design ; Volume 122 , 2017 , Pages 220-225 ; 02641275 (ISSN) ; Mohseni, S. M ; Jamilpanah, L ; Mohammadbeigi, M ; Sangpour, P ; Hosseini, S. A ; Iraji Zad, A ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
We report on the MoS2 and MoOx (x = 2 and 3) composite thin layers, electrodeposited, onto a Florine doped Tin Oxide (FTO) substrate. Our results show a change in relative content of these compounds in different thicknesses ranging from ∼20 to 540 nm. This change in the relative content at different thicknesses leads to a change in optical and electrical properties including bandgap and the type of semiconductivity. A sharp transition from p to n-type of semiconductivity is observed by scanning tunneling spectroscopy measurements. We find that the spin-orbit interaction of Mo 3d electrons in the MoS2 and MoO3 enhances by significant reduction of the MoO3 content in thicker layers. © 2017...
A novel deep learning backstepping controller-based digital twins technology for pitch angle control of variable speed wind turbine
, Article Designs ; Volume 4, Issue 2 , 2020 , Pages 1-19 ; Abrazeh, S ; Mohseni, S. R ; Zeitouni, M. J ; Gheisarnejad, M ; Khooban, M. H ; Sharif University of Technology
MDPI AG
2020
Abstract
This paper proposes a deep deterministic policy gradient (DDPG) based nonlinear integral backstepping (NIB) in combination with model free control (MFC) for pitch angle control of variable speed wind turbine. In particular, the controller has been presented as a digital twin (DT) concept, which is an increasingly growing method in a variety of applications. In DDPG-NIB-MFC, the pitch angle is considered as the control input that depends on the optimal rotor speed, which is usually derived from effective wind speed. The system stability according to the Lyapunov theory can be achieved by the recursive nature of the backstepping theory and the integral action has been used to compensate for...
Magnetoelastic coupling enabled tunability of magnon spin current generation in two-dimensional antiferromagnets
, Article Physical Review B ; Volume 104, Issue 18 , 2021 ; 24699950 (ISSN) ; Hamdi, M ; Park, S ; Khavasi, A ; Mohseni, S. M ; Sadeghi, A ; Sharif University of Technology
American Physical Society
2021
Abstract
We theoretically investigate the magnetoelastic coupling (MEC) and its effect on magnon transport in two-dimensional antiferromagnets with a honeycomb lattice. MEC coefficients along with magnetic exchange parameters and spring constants are computed for monolayers of transition-metal trichalcogenides with Néel magnetic order (MnPS3 and VPS3) and zigzag order (CrSiTe3, NiPS3, and NiPSe3) by ab initio calculations. Using these parameters, we predict that the spin-Nernst coefficient is significantly enhanced due to magnetoelastic coupling. Our study shows that although Dzyaloshinskii-Moriya interaction can produce spin-Nernst effect in these materials, other mechanisms such as magnon-phonon...
Symmetry enhanced spin-Nernst effect in honeycomb antiferromagnetic transition metal trichalcogenide monolayers
, Article Physical Review B ; Volume 103, Issue 1 , 2021 ; 24699950 (ISSN) ; Hamdi, M ; Haddadi, F ; Khavasi, A ; Sadeghi, A ; Mohseni, S. M ; Sharif University of Technology
American Physical Society
2021
Abstract
We investigate systematically the spin-Nernst effect in Néel and zigzag ordered honeycomb antiferromagnets. Monolayers of transition-metal trichalcogenides, MnPSe3, MnPS3, and VPS3 show an antiferromagnetic Néel order while CrSiTe3, NiPS3, and NiPSe3 show an antiferromagnetic zigzag order. We extract the exchange and Dzyaloshinskii-Moriya interaction parameters from ab initio calculations. Using these parameters, we predict that the spin-Nernst coefficient is at least two orders of magnitude larger in zigzag compared to the Néel ordered antiferromagnets. We find that this enhancement relies on the large band splitting due to the symmetry of magnetic configuration in the zigzag order. Our...
Nonsingular terminal sliding mode control with ultra-local model and single input interval type-2 fuzzy logic control for pitch control of wind turbines
, Article IEEE/CAA Journal of Automatica Sinica ; Volume 8, Issue 3 , 2021 , Pages 690-700 ; 23299266 (ISSN) ; Parvaresh, A ; Mohseni, S. R ; Jahanshahi Zeitouni, M ; Gheisarnejad, M ; Khooban, M. H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
As wind energy is becoming one of the fastest-growing renewable energy resources, controlling large-scale wind turbines remains a challenging task due to its system model nonlinearities and high external uncertainties. The main goal of the current work is to propose an intelligent control of the wind turbine system without the need for model identification. For this purpose, a novel model-independent nonsingular terminal sliding-mode control (MINTSMC) using the basic principles of the ultra-local model (ULM) and combined with the single input interval type-2 fuzzy logic control (SIT2-FLC) is developed for non-linear wind turbine pitch angle control. In the suggested control framework, the...
Nonsingular terminal sliding mode control with ultra-local model and single input interval type-2 fuzzy logic control for pitch control of wind turbines
, Article IEEE/CAA Journal of Automatica Sinica ; Volume 8, Issue 3 , 2021 , Pages 690-700 ; 23299266 (ISSN) ; Parvaresh, A ; Mohseni, S. R ; Zeitouni, M. J ; Gheisarnejad, M ; Khooban, M. H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
As wind energy is becoming one of the fastest-growing renewable energy resources, controlling large-scale wind turbines remains a challenging task due to its system model nonlinearities and high external uncertainties. The main goal of the current work is to propose an intelligent control of the wind turbine system without the need for model identification. For this purpose, a novel model-independent nonsingular terminal sliding-mode control (MINTSMC) using the basic principles of the ultra-local model (ULM) and combined with the single input interval type-2 fuzzy logic control (SIT2-FLC) is developed for non-linear wind turbine pitch angle control. In the suggested control framework, the...
Firtual hardware-in-the-loop FMU CO-simulation based digital twins for heating, ventilation, and air-conditioning (HVAC) systems
, Article IEEE Transactions on Emerging Topics in Computational Intelligence ; 2022 , Pages 1-11 ; 2471285X (ISSN) ; Mohseni, S ; Zeitouni, M. J ; Parvaresh, A ; Fathollahi, A ; Gheisarnejad, M ; Khooban, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
In this paper, a novel self-adaptive control method based on a digital twin is developed and investigated for a multi-input multi-output (MIMO) nonlinear system, which is a heating, ventilation, and air-conditioning system. For this purpose, hardware-in-loop (HIL) and software-in-loop (SIL) are integrated to develop the digital twin control concept in a straightforward manner. A nonlinear integral backstepping (NIB) model-free control technique is integrated with the HIL (implemented as a physical controller) and SIL (implemented as a virtual controller) controllers to control the HVAC system without the need for dynamic feature identification. The main goal is to design the virtual...
Simple One-Step Fabrication of Semiconductive Lateral Heterostructures Using Bipolar Electrodeposition
, Article Physica Status Solidi - Rapid Research Letters ; 2018 ; 18626254 (ISSN) ; Azizmohseni, S ; Hosseini, S. A ; Hasheminejad, M ; Vesali, N ; Iraji Zad, A ; Pourfath, M ; Mohseni, S. M ; Sharif University of Technology
Wiley-VCH Verlag
2018
Abstract
Unidirectional current flow is at the heart of modern electronics, which has been conceived by making p–n junctions or Schottky barriers between different kinds of materials. Within such elements, however, synthesis of thin film lateral heterostructures has so far remained challenging. Here, a one-step simple synthesis of p-type, n-type, and metallic lateral heterostructures using bipolar electrodeposition (BPE) technique is reported. Molybdenum oxides and sulfides with gradient of oxygen and sulfur are deposited at a metallic substrate. A lateral heterostructure is achieved with electrical properties that change from p- to n-type semiconductor and then to metal by moving in the plane of the...
High-Voltage, high-current electrical switching discharge synthesis of ZnO nanorods: A new method toward rapid and highly tunable synthesis of oxide semiconductors in open air and water for optoelectronic applications
, Article ACS Applied Materials and Interfaces ; Volume 13, Issue 39 , 2021 , Pages 46951-46966 ; 19448244 (ISSN) ; Abrari, M ; Karimi, V ; Shafiee, M ; Ghollamhosseini, S ; Taheri Ghahrizjani, R ; Ahmadi, M ; Wang, D ; Sun, H ; Soltanmohammadi, M ; Imani, A ; Ghanaatshoar, M ; Mohseni, S. M ; Taghavinia, N ; Sharif University of Technology
American Chemical Society
2021
Abstract
A novel method of oxide semiconductor nanoparticle synthesis is proposed based on high-voltage, high-current electrical switching discharge (HVHC-ESD). Through a subsecond discharge in the HVHC-ESD method, we successfully synthesized zinc oxide (ZnO) nanorods. Crystallography and optical and electrical analyses approve the high crystal-quality and outstanding optoelectronic characteristics of our synthesized ZnO. The HVHC-ESD method enables the synthesis of ZnO nanorods with ultraviolet (UV) and visible emissions. To demonstrate the effectiveness of our prepared materials, we also fabricated two UV photodetectors based on the ZnO nanorods synthesized using the subsecond HVHC-ESD method. The...