المجــــــــلات

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Browsing المجــــــــلات by Author "Abdou, Saliha"

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    Study Of Thermal And Mechanical Performance Of Cement Matrix Materials Reinforced By Nanofibers Cellulosic Of Date Palm Waste
    (Oum-El-Bouaghi University, 2020) Belili, Houcine; Abdou, Saliha
    Recently, the importance of environmental issues has made scholars to focus on the implementation of bio-degradable resources in different applications. This project aims to determine the technical feasibility of introducing raw palm waste into cement to develop a lightweight construction nanocomposite material and efficient thermal insulation. Furthermore, the characterization of extracted nanofibers cellulose was carried out through Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis of the date palm waste were investigated to characterize the microstructure and the chemical composition of the samples. Moreover, the characterization carried out by X-ray diffraction (XRD) analysis, confirmed the control of the micro and nanoscale dimensions of the fibrils. On the other hand, in nanocomposites, the results experimentally revealed a significant decrease in the coefficient of average thermal conductivity (λ) in the range of 0.0732 and 0.168 W.m-1.K -1; with the increase in the mass fraction of nanofibers induces a gradual in the cement matrix (3%, 5%, 10% and 15%). In addition, the nanocomposite demonstrated a good adhesion state of the nanofiber/matrix interface and acceptable mechanical properties with a maximum compressive and flexural strength of 4.54 MPa and 2.62 MPa respectively, which correspond to material standards range used in non-load-bearing masonry defined by (ASTM C109 / C 109-95). These thermal and mechanical performances are competitive with those of other insulating bio-based materials available on the market.
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    Vegetation Effects On Urban Street Microclimate And Thermal Comfort During Overheated Period Under Hot And Dry Climatic Conditions
    (Oum-El-Bouaghi University, 2016) Louafi Bellara, Samira; Abdou, Saliha
    Urban Planning has a great impact on local microclimate which in turn affects the comfort and the space quality within a city. This directly influences the absorption and emission of incoming solar and outgoing long wave radiation, which has a significant impact on temperature variations within the street as well as the surrounding environment (Urban Heat Island). Green areas play the most significant role in the city; they provide shade that helps to lower surface temperatures. They also help to reduce air temperatures through the process of evapotranspiration, dissipating ambient heat. The method is experimental, in which empirical measurements are carried out in different stations in a street of the city center of Constantine (Algeria) during overheated period. Moreover series of field simulation are done using a software tool: "TownScope3.2". The results confirm the importance of shade by the vegetation on microclimate and human comfort, and show a positive correlation between the air temperature, Tmrt, and PET in hot seasons. Vegetated urban space influences the quality of perception, the creation of urban ambience and improves pedestrian's thermal comfort. That increases the frequency of use of outdoor spaces for such climate.