Browsing by Author "Benotmane, Benamar"

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    Caractérisation des états de surface de bois d’eucalyptus et de pin d’Alep provenant de Zemmouri (Algérie)
    (2022) Tazrout, Mansour; Zerizer, Abdellatif; Benotmane, Benamar
    Le présent travail porte sur la valorisation de deux espèces de bois algériens, l’Eucalyptus camaldulensis Dehnh. et le pin d’Alep (Pinus halepensis Mild.) par l’étude de leur aptitude à être usinés et à produire des états de surfaces satisfaisants. L’état de surface, caractérisé par la rugosité moyenne Ra d’une part, et l’épaisseur moyenne du copeau Em, calculée par la formule de Schlesinger d’autre part, ont été étudiés en fonction des paramètres d’usinage que sont la fréquence de rotation N, la profondeur de passe H et la vitesse d’avance Vf. L’analyse des résultats a montré que pour les deux espèces de bois, Ra dépend de H et Vf, et atteint une valeur minimale pour H = 3 mm et Vf = 10 m/min. Dans ce cas, Ra du bois d’eucalyptus est inférieur à celui du bois de pin d’Alep. En revanche, Em dépend de H et Vf pour le bois de pin d’Alep et de N et Vf pour le bois d’eucalyptus. En outre, une corrélation significative a été trouvée entre Ra et Em pour le bois des deux espèces, ce qui laisse dire que Em est un critère d’estimation de l’état de surface usinée. Les résultats obtenus sont encourageants et peuvent servir à l’industrie du bois dans le choix des conditions de coupe pour la transformation de ces espèces.
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    Chemical characterization of sapwood and heartwood of Fraxinus angustifolia growing in Algeria
    (Taylor & Francis, 2021) Mazri, Sandra; Benotmane, Benamar; Hachemi, Messaoud; Pranovich, Andrey; Willför, Stefan; Smeds, Annika
    The result of this study is the chemical characterization of sapwood (SW) and heartwood (HW) of Fraxinus angustifolia native to Algeria. Lipophilic and hydrophilic extractives were isolated by means of an accelerated solvent extractor (ASE) using hexane and the acetone/water mixture respectively. The acid hydrolysis and methanolysis methods were used to determine cellulose and hemicelluloses contents. The Tappi Standards T 222 and UM 250 allowed Klason and acid-soluble lignin quantification respectively. Alkaline hydrolysis of wood samples followed by HPLC analysis was performed to determine the acetyl groups. The method detailed in TAPPI T 211 (2002) for determining the ash content was used. It was found that the SW and HW of Fraxinus A. had almost similar amounts of the main components, averaging 40.00 wt% cellulose, 28.00 wt% hemicelluloses within 18.00 wt% of xylan, 22.00 wt% lignin, 3% extractives and 0.83 wt% ash. However, the HW contained more triglycerides (0.08 wt%) than the SW (0.02 wt%). On the other hand, mannitol was the most predominant hydrophilic extractive in SW (1.60 wt%) than in HW (1.02 wt%). These findings are useful for practitioners in the paper, biofuel, cosmetics, food, pharmaceutical and chemical industries for the assessment of Fraxinus A. wood chemical treatment parameters
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    Experimental study of the effect of soaking temperature on the peeling parameters of two oak species (Quercus canariensis Willd. and Quercus afares Pomel)
    (Taylor et francis, 2020) Benbrahim, Zouheyr; Benotmane, Benamar; Zerizer, Aellatif; Denaud, Louis; Marchal, Remy
    Veneer checking is a common enough occurrence in woodworking. It appears as cracks in the veneer and generally following the grain. Their appearance and the variation of their depth and frequencies have tremendous impact on their utilization. Finding a means of identifying and characterizing the veneer checks is an important ongoing challenge. An automated device, named SMOF, was developed in LABOMAP (Arts et Metiers – France) and achieves this task. By using the SMOF device, the lathe checks occurred in veneers of two species: zeen oak (Quercus canariensis Willd.) and afares oak (Quercus afares Pomel) were detected, automatically imaged and then, the depth and intervals of checks measured. The results were described by statistical distributions that exhibited abnormalities, such as skewness and kurtosis, which were assessed by mode analysis. It has been established that hot soaking temperature (from 60°C to 90°C) reduce slightly the cutting forces for both species, no produce significant heart checks within the loose side of veneers. However, low soaking temperature (from 50°C to 65°C) allow avoiding deeper lathe checking, producing shallower ones acceptable for veneer production.
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    The impact of Covid-19 on energy consumption in Algeria- study and outlook
    (Web of Science, 2021) Zighed, Mohammed; Benotmane, Benamar
    Energy consumption is a major concern in the world, and even in Algeria, because of its eco- nomic and social impact on people’s way of life. All aspects and activities of life, including energy consumption, have been influenced by the deep sanitary crisis related to the Covid-19 pandemic, which has affected the world from 2020 until today. This study examines the energy consumption in Algeria for 2020 during the coronavirus pandemic. It was reported that a huge decline of 13% was recorded in the national consumption of energy in 2020 (petroleum products and natural gas) compared to 2019, falling from 67 MTOE to 59 MTEO. Electricity consumption has also dropped at a rate of 4%. This trend was due to the lockdown and containment policies implying a set of mea- sures serving as a non-clinical approach to mitigate the spread of the virus and better managing this sanitary crisis. Some of these measures could benefit the national energy-saving strategy out- side of the Covid-19 crisis. However, more technical and behavioral measures are highly required to ensure more effective saving and rationalize the use of energy, the main drive of the economy.
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    Performance of high-density polyethylene–starch–linen fiber biocomposite
    (2022) Zighed, Mohammed; Benotmane, Benamar
    This study was carried out on the physicochemical and mechanical characterization of a biocomposite consisting of high-density polyethylene (HDPE)/starch matrix reinforced with linen fiber which is renewable, inexpensive and biodegradable material. The linen fibers were modified through the alkaline treatment, and the polymers HDPE and starch were blended without compatibilizers. The composites were fabricated using a two-stage process: mixing and thermocompression. Characterizations were analyzed using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), Izod impact, and tensile strength tests. The FTIR spectra and SEM analysis showed weak compatibility between HDPE and starch. Compared to HDPE, the crystallinity of the HDPE/starch blend was enhanced and the thermal stability was reduced as revealed by ATG and DSC analyses. The mechanical Izod impact and tensile tests revealed improved stiffness and Young’s modulus with decreased impact strength, tensile stress and elongation-at-break. Alternatively, the HDPE/starch/linen fiber biocomposite exhibited better improved mechanical proprieties while maintaining good crystallinity and thermal stability, on account of the high fracture resistance and reinforcement of the linen. The biocomposite with 60% HDPE, 20% starch, and 20% linen fiber can be considered for use in industrial applications such as manufacturing and packaging, in accordance with economic and environmental requirements
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    Removal of methyl orange from aqueous solution using zeolitic imidazolate framework-11 : adsorption isotherms, kinetics and error analysis
    (Iranian Institute of Research and Development in Chemical Industries, 2023) Lamari, Rachid; Benotmane, Benamar; Mostefa, Farida
    Dyes, which are increasingly harmful to human health and ecology, are an environmental concern and their removal from wastewater is extremely required. It is also important for researchers to find relevant techniques to process these types of pollutants. This study examines the use of the synthesized imidazolate zeolite frameworks-11 (ZIF-11) by stirring method for the Methyl Orange (MO) dye removal from an aqueous solution. Scanning electron microscopy, thermogravimetry, X-ray diffraction, and Fourier transform infrared spectroscopy, were used for the analysis of ZIF-11 particles, which exhibited highly porous, irregular, and heterogeneous shapes and variable sizes. The MO removal was assessed by batch adsorption with ZIF-11 particles as adsorbent, whose efficiency was achieved at pH=8, stirring speed of 600 rpm, for a contact time of 40min, and a dosage of 800mg/L of MO solution. The thermodynamic and kinetic analysis of the MO adsorption process was achieved successfully with the pseudo-second-order kinetic model as well as Langmuir and Temkin isotherms, indicating the feasibility and spontaneity of the uniform distribution of MO molecules on the active sites of ZIF-11 particles. The calculated maximum adsorption capacity of MO on ZIF-11 particles was 178.57 mg/g, which is indicative of the potential adsorptive properties of the synthesized ZIF-11 for MO dyes