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Wyszukujesz frazę "Farahani, H. S." wg kryterium: Autor

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    Wyświetlanie 1-2 z 2
    Tytuł:
    An adaptive control scheme for hyperbolic partial differential equation system (drilling system) with unknown coefficient
    Autorzy:
    Farahani, H. S.
    Telabi, H. A.
    Baghermenhaj, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/229317.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    drilling systems
    adaptive control
    hyperbolic partial differential equations
    wave equation
    boundary control
    Opis:
    The adaptive boundary stabilization is investigated for a class of systems described by second-order hyperbolic PDEs with unknown coefficient. The proposed control scheme only utilizes measurement on top boundary and assume anti-damping dynamics on the opposite boundary which is the main feature of our work. To cope with the lack of full state measurements, we introduce Riemann variables which allow us reformulate the second-order in time hyperbolic PDE as a system with linear input-delay dynamics. Then, the infinite-dimensional time-delay tools are employed to design the controller. Simulation results which applied on mathematical model of drilling system are given to demonstrate the effectiveness of the proposed control approach.
    Źródło:
    Archives of Control Sciences; 2017, 27, 1; 63-76
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation and determination of heavy metals pollution in edible vegetables, water and soil in the south of Tehran province by GIS
    Autorzy:
    Shirkhanloo, H.
    Mirzahosseini, S. A. H.
    Shirkhanloo, N.
    Moussavi-Najarkola, S. A.
    Farahani, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/204640.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heavy metals
    environmental pollution
    vegetables
    agricultural soil
    agricultural water
    geographic information systems
    GIS
    Atomic Absorption Spectrometry
    AAS
    Opis:
    In this study, heavy metals pollutions in waters, soils and vegetables were investigated from farms, near oil refinery in south of Tehran city, Iran (Shahre Ray). The most important heavy metals in Iranian oil are vanadium, cobalt, nickel, arsenic and mercury (V, Co, Ni, As, Hg). In this region, the concentration of heavy metals in soils, well waters and leafy edible vegetables were evaluated in ten different points of farms. Geographic information systems (GIS) were used to estimate the levels of heavy metals concentration at unmeasured locations. After sample preparation, concentrations of heavy metals in vegetables, soils and waters were determined by atomic absorption spectrometry (AAS). Five different leafy edible vegetables from farms, i.e., Persian leek, dill, parsley, spinach and radish were sampled in spring, summer and autumn 2012. In vegetables and well water samples, the concentrations of V, Ni and Co were above the permissible limit of heavy metals as compared to WHO guidelines and the concentrations of these metals in agricultural soils were found to be lower in accordance to soil references. The industrial waste waters had high concentration of heavy metals in this area. In consequence, the results of this study indicate that industrial waste water can cause pollution in well waters and edible vegetables. So, this region is not suitable for cultivation and growing vegetables.
    Źródło:
    Archives of Environmental Protection; 2015, 41, 2; 64-74
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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