Browsing by Author "Chibani, A."

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    Petroleum-hydrocarbons Biodegradation By Pseudomonas Strains Isolated From Hydrocarbon-contaminated Soil
    (University of Eloued جامعة الوادي, 2017-05-01) Benchouk, A.; Chibani, A.
    Many indigenous microorganisms in water and soil are capable of degrading hydrocarbon contaminants. In this study, two bacterial strains were isolated from a contaminated soil of a refinery of Arzew (Oran). The isolated strains were identified as Pseudomonas aeruginosa (P3) and Pseudomonas fluoresens (P4). The capability of these isolates to degrade petroleum was performed by measuring the optical density, colony forming unit counts (CFU/ml) and concentration of total petroleum hydrocarbons (TPH). Degradation of Isomerate by these isolates was analyzed by gas chromatography with flame ionization detector (FID). Results indicated that the isolates can use petroleum as carbon source. Isolates P3 has the highest capability of hydrocarbons degradation.
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    STRUCTURAL, OPTICAL AND ELECTRICAL PROPERTIES OF BULK CuIn0.7Ga0.3Se2 SEMICONDUCTOR COMPOUND
    (University of Eloued جامعة الوادي, 2018-02-05) Gagui, S.; Hadjoudja, B.; Chouial, B.; Zaidi, B.; Chibani, A.
    In this work, we report on the study of structural, electrical and optical properties of the CuIn0.7Ga0.3Se2 compound. Analysis by X-ray diffraction showed that the prepared ingots are polycrystalline and of chalcopyrite structure. The preferential orientation in the plane (112) which is very suitable for the photovoltaic conversion was obtained. On the other hand, the lattice parameters a and c were calculated from the X-ray spectra, the c/a ratio was found to be equal to 2. Measurements of the electrical properties permitted us to get 7,645 Ω cm for the resistivity and 4,761.1016 cm-3 for the carrier concentration. Characterization by energy dispersive spectrometer (EDS) of the prepared ingots, allowed us to infer that their chemical composition is quasi-stoichiometric. Absorption measurements were performed using a UVVIS- NIR spectrophotometer and a value of 1.13 eV for the band gap width was obtained