Publications Internationales

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    Using Machine Learning Algorithms for the Analysis and Modeling of the Rheological Properties of Algerian Crude Oils
    (Taylor and Francis Ltd., 2024) Souas, Farid; Oulebsir, Rafik
    Our research described in this report investigated the rheological behavior of crude oils from the Tin Fouye Tabankort oil field in Southern Algeria, focusing on their viscosity under varying temperatures (10 °C–50 °C). The results show that the oils exhibited non-Newtonian shear-thinning behavior at low shear rates, with the viscosity decreasing as the temperature was increased. At higher shear rates, the Herschel–Bulkley model accurately described the oils’ transition to Newtonian behavior. Machine learning models, including CatBoost, LightGBM, and XGBoost, were trained on the experimental data to predict the viscosity, with CatBoost and XGBoost showing superior performance. We suggest these findings are valuable for improving the efficiency of oil transportation and processing.
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    Effect of temperature on the performance of CGS/CIGS tandem solar cell
    (2023) Elbar, Mourad; Tobbeche, Souad; Chala, Slimane; Saidani, Okba; Kateb, Mohamed Nadjib; Serdouk, Mohamed Redha
    The CGS and CIGS being promising materials for large scale photovoltaic applications, the effect of temperature on the electrical parameters of a CGS/CIGS tandem solar cell has been investigated in this work. The copper gallium diselenide (CGS) and copper indium gallium diselenide (CIGS) structures as topcell and bottom-cell respectively, were numerically simulated under AM1.5G spectral illumination using the two-dimensional device simulator Silvaco-Atlas. The temperature dependency of the solar cell’s characteristics was investigated in the temperature range from 300 to 400 K at intervals of 20 K. The simulation results show the density current (Jsc) slightly increases whereas the open-circuit voltage (Voc) and fill factor (FF), conversion efficiency () decreases with the increase in temperature. The tandem cell operating temperature efficiency was found to be (– 0.34 %/K), which is slightly higher than that of CGS solar cell (– 0.29 %/K), but markedly better than that of CIGS solar cell (– 0.41 %/K)
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    Effect of temperature and initiator on glass fibre/unsaturated polyester composite : cross-linking, mechanical properties
    (Springer, 2009) Belloul, Nabila; Ahmed-Benyahia, Ali; Serier, Aicha; Ouali, Nourdine
    The influence of temperature (20–60°C) and initiator ratio (1–3%) on the cross- linking and mechanical properties of the matrix resin and of gla ss fibre/unsaturated polyester composite; prepared by hand lay-up process and us ed in marine structures, is studied. Reactivity tests have shown that the effect of temperature in crease is similar to that of initiator ratio. They increase reaction rate and reduce the gelation tim e and exothermic peak. Conversely, the Fourier transform infrared spectroscopy analyses have sh own that the final conversions of styrene and polyester vinyl groups are almost co mplete, and that whatever the chosen operating conditions. Tensile and bending tests have shown that the m echanical properties (Elastic modulus, tensile strength...) are optimal for the samples operated at 40°C with 1% of initiator and those operated at 20°C with 2% of initiator