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Wyszukujesz frazę "Rezvani, A." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Numerical Simulation of Current Dependence on Well Widths in AlGaAs/GaAs/AlGaAs Double Barrier Diode Structures
    Autorzy:
    Rezvani, A. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035656.pdf
    Data publikacji:
    2003-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Hs
    71.15.Mb
    71.10.Ca
    Opis:
    A numerical procedure based on the time-dependent Kohn-Sham equation with an improved boundary condition for the modeling double barrier resonant tunneling diode is presented. The dependence of current components on well widths in AlGaAs/GaAs/AlGaAs structure is studied. An oscillatory behavior was observed as the width of the well is changed. Our evaluation shows that this oscillation cannot attribute to the well-known oscillation at resonance state.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 1; 47-56
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic response improvement of hybrid system by implementing ANN-GA for fast variation of photovoltaic irradiation and FLC for wind turbine
    Autorzy:
    Izadbakhsh, M.
    Rezvani, A.
    Gandomkar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141412.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid system
    photovoltaic
    FLC
    permanent magnet synchronous generator (PMSG)
    ANN-GA
    Opis:
    In this paper, dynamic response improvement of the grid connected hybrid system comprising of the wind power generation system (WPGS) and the photovoltaic (PV) are investigated under some critical circumstances. In order to maximize the output of solar arrays, a maximum power point tracking (MPPT) technique is presented. In this paper, an intelligent control technique using the artificial neural network (ANN) and the genetic algorithm (GA) are proposed to control the MPPT for a PV system under varying irradiation and temperature conditions. The ANN-GA control method is compared with the perturb and observe (P&O), the incremental conductance (IC) and the fuzzy logic methods. In other words, the data is optimized by GA and then, these optimum values are used in ANN. The results are indicated the ANN-GA is better and more reliable method in comparison with the conventional algorithms. The allocation of a pitch angle strategy based on the fuzzy logic controller (FLC) and comparison with conventional PI controller in high rated wind speed areas are carried out. Moreover, the pitch angle based on FLC with the wind speed and active power as the inputs can have faster response that lead to smoother power curves, improving the dynamic performance of the wind turbine and prevent the mechanical fatigues of the generator.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 2; 291-314
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of microgrid dynamic performance under fault circumstances using ANFIS for fast varying solar radiation and fuzzy logic controller for wind system
    Autorzy:
    Izadbakhsh, M.
    Rezvani, A.
    Gandomkar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141548.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic performance
    photovoltaic
    PMSG
    ANFIS
    droop control
    Opis:
    The microgrid (MG) technology integrates distributed generations, energy storage elements and loads. In this paper, dynamic performance enhancement of an MG consisting of wind turbine was investigated using permanent magnet synchronous generation (PMSG), photovoltaic (PV), microturbine generation (MTG) systems and flywheel under different circumstances. In order to maximize the output of solar arrays, maximum power point tracking (MPPT) technique was used by an adaptive neuro-fuzzy inference system (ANFIS); also, control of turbine output power in high speed winds was achieved using pitch angle control technic by fuzzy logic. For tracking the maximum point, the proposed ANFIS was trained by the optimum values. The simulation results showed that the ANFIS controller of grid-connected mode could easily meet the load demand with less fluctuation around the maximum power point. Moreover, pitch angle controller, which was based on fuzzy logic with wind speed and active power as the inputs, could have faster responses, thereby leading to flatter power curves, enhancement of the dynamic performance of wind turbine and prevention of both frazzle and mechanical damages to PMSG. The thorough wind power generation system, PV system, MTG, flywheel and power electronic converter interface were proposed by Rusing Mat-lab/Simulink.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 4; 551-578
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Next Nearest Neighbors Effects on Berry Curvature of Graphene
    Autorzy:
    Farajollahpour, T.
    Rezvani, A.
    Khodarahmi, M.
    Arasteh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419852.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.Pr
    81.05.ue
    Opis:
    In this paper energy bands and Berry curvature of graphene was studied. Desired Hamiltonian regarding the next-nearest neighbors was obtained by tight-binding model. By using the second quantization approach, the transformation matrix is calculated and the Hamiltonian of system is diagonalized. With this Hamiltonian, the band structure and wave function can be calculated. By using calculated wave function the Berry connection and Berry curvature of our system are calculated. Our results are exactly consistent with previous methods and also the Berry curvature throughout the Brillouin zone get zero.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 180-183
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An innovative method for stress analysis of Y25 bogie under oscillating loads due to tank wagon fluid sloshing
    Autorzy:
    Rezvani, M. A.
    Feizi, M. M.
    Shadfar, M
    Powiązania:
    https://bibliotekanauki.pl/articles/949304.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Y25 bogie
    dynamic modeling
    FEM
    stress analysis
    longitudinal sloshing
    Opis:
    Freight wagons carry higher axle loads and may travel along tracks of lower quality. This can be interpreted as higher dynamic loading of freight bogies especially for tanker cars that are subjected to sloshing loading. Rail irregularities, particularly during braking and running on curved tracks initiate the fluid sloshing. This article is about introducing an innovative method for analyzing bogie stresses of tanker cars while in travel and under critical circumstances. The effect of the vehicle speed of travel, its liquid filling ratio, track quality and fluid density are also investigated in terms of stress results of bogies.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 745-755
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of sulfur and phosphorous from iron ore concentrate by leaching
    Autorzy:
    Rezvani Pour, H.
    Mostafavi, A.
    Shams Pur, T.
    Ebadi Pour, G.
    Haji Zadeh Omran, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110072.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sulfur removal
    chemical leaching
    iron ore concentrate
    Opis:
    Iron ore having high-sulfur content causes problems in the concentrate production, pelletizing, and steel-making processes and environmental issues such as sulfur dioxide emission during the concentrate pelletizing process, and effect on steel quality. The current study was focused on the removal of sulfur from iron ore concentrate using chemical leaching technique. Magnetite iron ore concentrate was chosen for this purpose. The results obtained from the study showed that more than 90% of the total sulfur content was removed from the iron ore concentrate by the chemical leaching. Effects of several parameters, including temperature, stirring speed, particle size, and use of organic solvent on the sulfur removal was investigated by a series of experimental conditions. After optimizing the experimental conditions, it was demonstrated that in addition to sulfur, more than 80% of phosphorus, another important impurity, was also removed from the iron ore concentrate. In addition, one of the major advantages of our proposed method was the transformation of mineral pyrites to useful byproducts such as elemental sulfur.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 845-854
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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