http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Mohamed Labed (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Labed Nasreddine,Attoui Issam,Makhloufi Salim,Bouraiou Ahmed,Bouakkaz Mohammed Salah 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
In the recent years, the usage of fossil fuels presents the major source of air pollutants and greenhouse gases. Renewable energies essentially wind, solar, geothermal, waves, biomass, hydrogen and so on, are used as an alternative source of fossil energy to overcome these problems. Among the several renewable energy sources, the wind energy is one of the primary types of renewable energy that can be effectively connected to the grid. However, power generation management, control and condition monitoring of wind turbine systems represent major challenges to the researchers in this field. Therefore, this paper considers these issues and demonstrates effective techniques of power generation management, system control and condition monitoring. A hybrid super-capacitor-battery energy storage system is used to support the power generation of the wind turbine under wind speed variations and grid demand changes using two DC/DC converters. Fractional Order PI Controllers tuned using particle swarm optimization PSO algorithm, are proposed in order to control the proposed system. The control strategy guarantees the stability of the wind turbine system in healthy and faulty operating conditions. Based on the stator reactive power signal of the DFIG, the proposed diagnostic strategy involves a data-driven method using the FFT algorithm for extracting the frequency feature parameters. The Adaptive Neuro-Fuzzy Inference System ANFIS is used for automatically detecting and classifying the rotor and stator faults of the DFIG. Finally, simulation results validate the effectiveness and the reliability of the proposed methods.
-
Temperature Dependent Poly Crystalline Zinc Oxide Thin Film Transistor Characteristics
Naceur Soufyane,Nouredine Sengouga,Mohammed Labed,Afak Meftah 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.5
The temperature dependence of the electrical characteristics and parameters of a thin fi lm transistor based on polycrystalline zinc oxide (pc-ZnO TFT) is numerically clarifi ed. The drain current as a function the gate voltage (transfer characteristics), of the pc-ZnO TFT is simulated for temperatures ranging from 300 to 400 K. The transfer characteristics, the drain current versus gate voltage, were fi rst computed. The threshold voltage and the electric field mobility were then extracted from these transfer characteristics. The drain current shows Arrhenius-type dependence with temperature. The activation energy varies almost linearly from 0.57 eV at V GS = 2 V to 0.019 eV at V GS = 26 V then goes up to 0.071 eV at V GS = 40 V. This means that this dependence is very strong in the sub-threshold regime while it is inactivated beyond threshold voltage. The threshold voltage and the electric fi eld mobility were also found to be thermally activated. This temperature dependence may be attributed to the contribution of the density of states to the channel electrons in the sub-threshold region or to speed accumulation of electrons at the pc ZnO/SiO 2 interface. However, the contribution of this density of states beyond threshold voltage is negligible. Furthermore, the threshold voltage was found to be proportional to the electric field mobility.
-
Slimane Chala,Madani Bdirina,Mourad Elbar,Yassine Naoui,Yazid Benbouzid,Taki Eddine Taouririt,Mohamed Labed,Rami Boumaraf,Abdel Fodhil Bouhdjar,Nouredine Sengouga,Fahrettin Yakuphanoğlu,Saâd Rahmane 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.5
Zinc oxide (ZnO) thin films were deposited on glass substrates by using sol–gel spin coating technique. Zinc acetate dihydrate and 2-methoxyethanol were used as precursor with different molar concentrations, 0.2 M, 0.3 M and 0.6 M. The effect of precursor concentration on the structural and optical properties, transmission (T), refl ection (R), optical bandgap (Eg), Urbach energy (E U ), refractive index (n), extinction coefficient (k), single-oscillator energy (E 0 ), dispersion energy (E d ), moments M −1 and M −3 , dielectric constant (ε) and optical conductivity (σ), of the ZnO thin films was studied and investigated. Although, the transmittance, slightly, decreased and the reflectance increased, as the molar concentration increased, the measurements showed that all samples have high transparency and low reflectivity in the visible range which make them suitable for solar cells applications. It is also found that, as the molarity increased, the ZnO thin films exhibited lower Eg and E U and higher Ed, M −1 and M −3 .
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
