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Département de Physique
47
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20
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Département d'Électrotechnique
4
Total Impact Points
19
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  • [Show abstract] [Hide abstract]
    ABSTRACT: The anatomical and histochemical study of young and adult endocarps of Argania spinosa (sampled from Tindouf; Algeria) shows a general structure that is similar to that of majority of stone fruits. These samples consist of tissues that contain lignified and cellulosic cell walls. The majority of the tissues are composed of sclerenchyma cells; with very thick lignified cell walls and conducting tissues. Coniferyl lignins are abundant in the majority of the lignified tissues. However, the coniferyl lignins appear at the primary xylem during lignification. Syringyl lignins are present in small quantities. The electron microscopy observation of the sclerenchyma cell walls of the young endocarp shows polylamellate strates and, cellular microfibrils in arced patterns. This architecture is observed in the cell walls of the adult endocarp only after the incubation of the tissue in methylamine. These configurations (arcs) are the result of a regular and complete rotation with a 180° variation in the microfibril angle; the complete and symmetrical arcs show a helicoidal mode of construction. The observation of the sclerenchyma cells revealed the capacity of helicoidal morphogenesis to adjust itself under the influence of topological constraints, such as the presence of a large number of pit canals, which maintain symplastic transport.
    Micron 12/2014; 67:100–106.
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    ABSTRACT: In this paper, the influence of polyethylene oxide (PEO) and shear rate on rheological properties of bentonite suspensions is studied. The model of Herschel–Bulkley which is used to fit the flow curves of the mixture which based on the bentonite-polyethylene oxide and the Generalized Kelvin–Voigt model has been successfully applied to fit the creep and recovery data and to analyze the viscoelastic properties of mixture. The addition of polyethylene oxide (PEO) in a concentration range between 0 and 2% in 4% of bentonite induces not only an increase of the yield stress and the consistency index of bentonite but also a decrease of the flow index of bentonite. It is also the addition of PEO between 0 and 2% to 4% that may cause an increase in the viscoelastic properties of bentonite. For constant shear rate applied on the 4% bentonite at the 20 °C in which a thixotropic behavior was observed and analyzed by using a modified model of Herschel–Bulkley a structural parameter λ is included in order to account for time dependent effect.
    Applied Clay Science 09/2014; 99:306–311.
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    ABSTRACT: The Full Potential Linear Muffin Tin Orbitals method within the density functional theory has been utilized to calculate structural and electronic properties of the CdTe compound. We have checked that the CdTe has two phase-transitions from zinc-blend to cinnabar and from cinnabar to rocksalt. We have found that the rigidity, the energy and the nature of the gap change according to the phase change, so we can predict that a CdTe detector may have different behaviors in different phase conditions. In order to investigate this behavior change, the linear and the mass attenuation coefficients of X-ray in rocksalt, zinc-blend and cinnabar structures are calculated from 10 keV to100 keV, using the XCOM data. We have found that when CdTe undergoes a phase transition from zinc-blend to cinnabar, its linear attenuation coefficient decreases down to a value of about 100 times smaller than its initial one, and when it undergoes a transition from cinnabar to rocksalt it increases up to a value about 90 times larger than its initial one.
    Journal of Alloys and Compounds 07/2014; 602:261–264.

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J. Inf. Sci. Eng. 01/2005; 21:659-668.
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3rd International Conference on Signals, Circuits & Systems (IEEE SCS’09); 01/2009
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