Saïd Zouhdi

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An efficient technique is proposed for analyzing two- and three-dimensional lossy periodic composite materials, combining an asymptotic multiscale method with the unfolding method. The computed effective conductivities for square cylinders and cubes suspended in a host isotropic medium are compared to the Maxwell-Garnett mixing formula predictions. The(More)
A novel homogenization technique, combining an asymptotic multiscale method with wave-field conception, is proposed for computing the quasi-static effective parameters of three-dimensional lattices of general bianisotropic composite materials. This technique is based on the decomposition of the fields into an averaged nonoscillating part and a corrected(More)
Vector potential formulation and parametric studies of electromagnetic scattering problems of a sphere characterized by the rotationally symmetric anisotropy are studied. Both epsilon and mu tensors are considered herein, and four elementary parameters are utilized to specify the material properties in the structure. The field representations can be(More)
In this paper, a multilayered cylinder filled with metamaterials is studied. General formulas of electromagnetic fields in each region are derived using the eigenfunction expansion method. For an infinite line source, the image property is observed when the radius of this cylinder is much larger than the wavelength. The distributions of electromagnetic(More)
Based on the concept of the cloak generating function, we propose an implicit transformation-independent method for the required parameters of spherical cloaks without knowing the needed coordinate transformation beforehand. A non-ideal discrete model is used to calculate and optimize the total scattering cross-sections of different profiles of the(More)
When the Fast Hankel Transform filter technique is used to calculate the dyadic multilayered Green's functions, it can be difficult to obtain accurate numerical results because of the branch-cut singularity and the surface wave poles singularity. The Modified Fast Hankel Transform filter algorithm is proposed to overcome this problem by expressing the(More)
A fast solution for rigorously deriving and calculating spatial-domain dyadic Green's functions for the planar multilayers of uniaxial media has been established based on the modified fast Hankel transform (MFHT) method. The kDB coordinate system is exploited and integrated with the wave iterative technique to obtain the spectral-domain Green's function.(More)
Risk of infection by hepatitis B (HBV) and C (HCV) viruses remains a permanent problem, not only for health care workers but also for patients. It is often a major public health concern in low incomes countries. The aims of this study were to determine seroprevalence of viral hepatitis B (HBV) and C (HCV), frequency occurrence of blood exposure accidents(More)
When the fast Hankel transform (FHT) filter technique is used to calculate the spatial-domain Green's functions for planar multilayered media, it can be difficult to obtain accurate numerical results because of branch-cut singularities and the surface-wave pole singularities. Although the singularities can be efficiently avoided through deforming the(More)
Based on Mie scattering theory and the assumption that the particle is electrically small in size (k(t)a≪1,k(m)a≪1), an analytic relationship between radial and tangential permittivity parameters has been established for achieving minimal scattering from an arbitrary rotationally uniaxial anisotropic spherical object incident by a plane wave. Analysis of(More)