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Träfflista för sökning "WFRF:(Benyoussef A) "

Search: WFRF:(Benyoussef A)

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  • Houmad, M., et al. (author)
  • Improving the electrical conductivity of Siligraphene SiC7 by strain
  • 2019
  • In: Optik (Stuttgart). - : Elsevier BV. - 0030-4026 .- 1618-1336. ; 177, s. 118-122
  • Journal article (peer-reviewed)abstract
    • Using the 1st principle calculations founded on Density Functional Theory (DFT), we examined the strain effect of band gap (BG) and electrical property (EP) of Siligraphene (g-SiC7) under biaxial strains (Compressive and tensile) using Generalized Gradient Approximation (GGA). We found that the BG of g-SiC7 was decreasing as function of the strain and we remarked that the electrical conductivity of g-SiC7 under biaxial strains become important of 6% for tension effect. For the compressive, we obtained an increase for all compressive applying, but we remarked the higher and lower values are successively -2% and -6%. Last not least, we deduced that it's possible to increase the electrical conductivity of g-SiC7. Also, this material can be used in solar cell applications and for photo-voltaic (PV) applications as a light donor material.
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3.
  • Zidane, Mustapha, et al. (author)
  • Thermophysical properties of helium and hydrogen mixtures under high pressure predicted by ab-initio calculations : Implications for Saturn and Jupiter planets
  • 2022
  • In: Chemical Physics. - : Elsevier BV. - 0301-0104 .- 1873-4421. ; 555, s. 111430-
  • Journal article (peer-reviewed)abstract
    • The thermodynamic and physical properties of Helium (He) and Hydrogen (H) mixtures are crucial form an astrophysical perspective. Nowadays, it is well known that these two elements constitute roughly 95% of the matter in the solar system. The high-pressure equation of He state doped with H is calculated in the framework of density functional theory (DFT) for three crystallographic structures. Namely, the Body Centered Cubic (BCC), Face Centered Cubic (FCC), and hexagonal close packed (HCP) structures have been studied. The equations of state (EOS) are provided for the He0.90H0.10 and He0.70H0.30 mixtures and the energy of the same mixtures are calculated with the earlier structures. The band structure for pressures of 0, 75 and 150 GPa were estimated by our calculations for the presumed crystal structures in the case of pure He and He0.70H0.30 mixture for comparison. The k(x) - k(y) cuts of the Bloch Spectral Functions (BSF) are presented for the pure He and He0.70H0.30 mixture for the three structures to explore the impact of doping on electronic properties. In addition, electrical resistivity calculations of the mentioned structures were carried out for mixtures with 10, 15, 20 and 30% of H. At final stage, the enthalpy (Delta H) of these latest mixtures have been deduced for the three crystal structures.
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