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Wyszukujesz frazę "Shaban, M." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Efficiency control of inverter fed induction motor drives
    Autorzy:
    Shaban, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/376136.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    induction motor
    torque-speed characteristic
    inverter
    Opis:
    Induction motor losses at partial loads can be significantly reduced by operating an adjustable frequency drive at the optimum slip which yields maximum efficiency. The present investigation quantifies the potential improvement in induction motor efficiency for both standard and energy efficient motors operating on a six-step voltage-source inverter supply. The analysis employs a comprehensive model of the induction motor which incorporates the frequency - dependent nature of the motor parameters and effects of stray load loss. Efficiency contours are plotted on a torque- speed plane for constant volts/hertz operation and for optimum slip frequency control plotted as a contour map.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 291-295
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An optimization model for reactive power control of super high voltage grid systems
    Autorzy:
    Shaban, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/377699.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    MVAR
    super high voltage grid systems
    power control
    voltage control
    reactive power
    Opis:
    This paper develops an optimization model to control the excessive (MVAR) generation by super high voltage gird systems for maintaining the nodal voltages within the required acceptable margin. The model enhances an approximate solution on the condition of balanced real power. The pseudo-inverse method of optimization is implemented as an optimal optimization is implemented as an optimal means of solving non-square systems of equations based on LaGrange's theory of optimization. It recommends the locations and ratings of the minimum required reactors from the preinstalled ones that to be in service for optimum nodal reactive power and voltage controls.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 89-93
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An algorithm of velocity field evaluation via temperature field measurement on the basic of streamline-defined coordinates
    Autorzy:
    Leble, S.
    Shaban, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1940181.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska
    Tematy:
    free convective heat transfer
    isothermal surface
    numerical analysis
    natural convection
    streamline coordinate system
    ciepło konwekcyjne
    przepływ ciepła
    powierzchnia izotermiczna
    analiza numeryczna
    konwekcja naturalna
    transformacja współrzędnych
    Opis:
    A new algorithm is presented for evaluating the velocity field of the heat convection flow from a vertical solid flat plate using the temperature field. Using the coordinate transformation of Cartesian coordinates, to coordinates defined via streamlines, and visible in such coordinate approximations, it is possible to express the basic flow fields in terms of the temperature gradients only. After discretization we formulate approximated sufficient finite-difference formulas to evaluate the velocity field using the experimental data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 3; 247-259
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of electro-thermal stress of IGBT devices
    Autorzy:
    Shaban, M. A.
    Ettomi, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/377956.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    electro-thermal stress
    IGBT
    Insulated Gate Bipolar Transistor
    Opis:
    The aim of this paper is to present a new approach which consists to correlate or coupled the functional and electrical stress with temperature. This approach can be extremely useful in the predicting the stressing effect and the impact of IXGH-IGBT I-V characteristics on circuit degradation. Moreover, this new approach significantly improves such parameters likes (threshold voltage Vth, collector saturation current, the stress and enhanced collector leakage current) and provides new capability for use this power device IXGH-IGBT in an actual circuit environment and modules. We also explain the physical reasons behind the improvement obtained using functional electrical stress on the IGBTs for IXYS constructor with temperature. Moreover, the forward blocking capability of IXGH-IGBT under a coupled Functional - Electro stress at high temperature was analyzed using simulation. This paper gives a straight comparison in term of the stress for improving the switching speed of IGBT device. This study is essential to ensure product reliability and to the evaluation of hot carrier reliability in the early stages. Furthermore, our reliability study permits us to improve the implantation of the device in a circuit, as well as its use in industrial operating conditions. The need for good simulator (Spice, Spice) to carry out a reliability study is pointed out in this paper.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 76; 275-284
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous Adsorption of Ternary Antibiotics (Levofloxacin, Meropenem, and Tetracycline) by SunFlower Husk Coated with Copper Oxide Nanoparticles
    Autorzy:
    Ibrahim, Mohammed A.
    Shaban, Mohammed Ali A.
    Hasan, Yaseen Rashid
    M-Ridha, Mohanad J.
    Hussein, Haitham A.
    Abed, Khalid M.
    Mohammed, Sabah J.
    Muhamad, Mohd Hafizuddin
    Hasan, Hassimi Abu
    Powiązania:
    https://bibliotekanauki.pl/articles/2105287.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    adsorption
    antibiotics
    neural network
    wastewater
    sustainable process
    Opis:
    In this study, a new adsorbent derived from sunflower husk powder and coated in CuO nanoparticles (CSFH) was investigated to evaluate the simultaneous adsorption of Levofloxacin (LEV), Meropenem (MER), and Tetracycline (TEC) from an aqueous solution. Significant improvements in the adsorption capacity of the sunflower husk were identified after the powder particles had been coated in CuO nanoparticles. Kinetic data were correlated using a pseudo-second-order model, and was successful for the three antibiotics. Moreover, high compatibility was identified between the LEV, MER, and TEC, isotherm data, and the Langmuir model, which produced a better fit to suit the isotherm curves. In addition, the spontaneous and exothermic nature of the adsorption process was crucial for transforming the three antibiotics into CSFH. The greatest CSFH adsorption capacity was in MER (131.83 mg/g), followed by TEC (96.95 mg/g), and LEV (62.24 mg/g). These findings thus indicate that CSFH is one of the most effective and efficient adsorbents to use for eliminating wastewater contaminated with antibiotic residue.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 6; 30--42
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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