Publications Internationales
Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13
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Item An estimate of a frequency characterizing the electrochemical stability of a gold electrode modified by MHDA thiol in different ways(Croatian Chemical Society, 2021) Chaibi, Sarah; Zabat, Mokhtar; Hadjersi, Toufik; Abaidia, Seddik-El-Hak; Zine, Nadia; Yaakoubi, Nourdin; Errachid, AbelhamidA theoretical investigation aimed at estimating a characteristic frequency in the medium-low frequency domain in which the impedance response of a given interface measured by electrochemical impedance spectroscopy (EIS) is almost constant, constitutes the basic idea of this work. A theoretical model was subsequently applied to the data resulting from EIS measurements performed on gold electrodes modified by various ways of 16-mercaptohexadecanoic acid (MHDA) thiol functionalization. Analysis of these data revealed a direct relationship between the way the substrate was modified and this characteristic frequencyItem Hydrodynamic instabilities in swirling flow under axial magnetic field(ELSEVIER, 2021) Laouari, A.; Mahfoud, B.; Bessaïh, R.; Hadjadj, A.The present paper investigates numerically the hydrodynamic instabilities occurring in a cylindrical container filled with a conducting viscous fluid and submitted to an axial magnetic field. The axisymmetric swirling flow produced by rotation of the bottom disk, in which a vortex breakdown bubble occurred on the axis of symmetry. This flow structure represents one of the most important instabilities. The governing Navier–Stokes and potential equations are solved by using the finite-volume method. For both steady-state and oscillatory regimes, various combinations of the top, bottom, and side walls conductivity are considered. The effects of the magnetic field and wall electrical conductivities on the position of vortex breakdown and his disappearance is developed. The results obtained showed that the vortex breakdown is suppressed beyond the magnitude of the magnetic field exceeds a critical value. The stability diagram (Ha–Re) corresponding to the vortex breakdown disappearance for electrically conducting and insulating walls is obtained.Item Synthesis and characterization of HY Zeolite-doped poly(aniline) by chemical oxidation method(2016) Ghebache, Zohra; Djelali, Nacer-Eddine; Zitouni, Safidine; Hamidouche, FahimItem Thermoelectrical characterization of new material based on PANI/zeolite HY composite, used for the detection of carbon dioxide(Nature Publishing Group, 2013) Safidine, Zitouni; Ghebache, Zahra; Lamouri, SaadItem Cationic Polymerization of 1,3-dioxolane Using Sacrificial Anodes(2006) Djelali, Nacer-Eddine; Aliouche, D.; Daddi Oubeka, L.; Pierre, G.The electroinitiated polymerization of 1,3-dioxolane is carried out with metallic cationic initiators generated electrochemically V, Hg, Cr, Al