Time filter

Source Type

Ahl Laamara R.,Mohammed V University | Ahl Laamara R.,Center Regional Des Metiers Of Leducation Et Of La Formation | Douhou K.,Mohammed V University | Ennadifi S.-E.,Mohammed V University
Astroparticle Physics | Year: 2015

It is shown that heavy sterile neutrinos can be a consequence of a new broken U(1)X symmetry. This sterile symmetry is further speculated to be related to the conservation of the dark number associated with Dark Matter particles, corresponding to a dark neutrino mass mND≥1keV with a high scale ≥∼102GeV dark symmetry U(1)D breaking. © 2014 Elsevier B.V. All rights reserved. Source

We used an exact analytical approach to investigate the propagation of the electromagnetic wave through a photonic band gaps material with sinusoidal periodicity of a dielectric permittivity. Mathieu's functions are used to obtain the solution of Maxwell equations in the structure for the nonzero angle of incidence wave. The analytical expression of the transmittance and the distribution of the electric field inside the structure are given. © 2015 Elsevier GmbH. Source

Chabli A.,Center Regional Des Metiers Of Leducation Et Of La Formation | Chalouan A.,Mohammed V University | Akil M.,Mohammed V University | Galindo-Zaldivar J.,Instituto Andaluz Of Ciencias Of La Tierra | And 7 more authors.
Journal of Geodynamics | Year: 2014

The Atlantic Moroccan Meseta margin is affected by far field recent tectonic stresses. The basement belongs to the variscan orogen and was deformed by hercynian folding and metamorphism followed by a post-Permian erosional stage, producing the flat paleorelief of the region. Tabular Mesozoic and Mio-Plio-Quaternary deposits locally cover the Meseta, which has undergone recent uplift, while north of Rabat the subsidence continues in the Gharb basin, constituting the foreland basin of the Rif Cordillera. The Plio-Quaternary sedimentary cover of the Moroccan Meseta, mainly formed by aeolian and marine terraces deposits, is affected by brittle deformations (joints and small-scale faults) that evidence that this region - considered up to date as stable - is affected by the far field stresses. Striated faults are recognized in the oldest Plio-Quaternary deposits and show strike-slip and normal kinematics, while joints affect up to the most recent sediments. Paleostress may be sorted into extensional, only affecting Rabat sector, and three main compressive groups deforming whole the region: (1) ENE-WSW to ESE-WNW compression; (2) NNW-SSE to NE-SW compression and (3) NNE-SSW compression. These stresses can be attributed mainly to the NW-SE oriented Eurasian-African plate convergence in the western Mediterranean and the escape toward the SW of the Rif Cordillera. Local paleostress deviations may be related to basement fault reactivation. These new results reveal the tectonic instability during Plio-Quaternary of the Moroccan Meseta margin in contrast to the standard passive margins, generally considered stable. © 2014 Elsevier Ltd. Source

Terhzaz J.,Center Regional Des Metiers Of Leducation Et Of La Formation | Terhzaz J.,Mohammed V University | Elmajid H.,Mohammed V University | Ammor H.,Mohammed V University
MATEC Web of Conferences | Year: 2014

This W presents a new technique of Dielectric Characterization of composites building materials. This technique is based on the modeling of an open coaxial cell with a mathematical formulation that links the admittances of the filled and empty cell to the complex permittivity ε* of materials characterization. We applied this technique to the dielectric characterization of some building materials powder in the frequency band (100MHz-4GHz). We also characterize some composite materials (sand- brick, cement- sand, and cement-brick) depending on the volume fraction for Mobile Phone Frequencies. We made a comparison with the laws of mixtures to identify the most appropriate law to render the dielectric behavior of these materials. © Owned by the authors, published by EDP Sciences, 2014. Source

Ouasri A.,Center Regional Des Metiers Of Leducation Et Of La Formation | Ouasri A.,Universite Ibn Tofail | Rhandour A.,Universite Ibn Tofail | Saadi M.,Mohammed V University | El Ammari L.,Mohammed V University
Acta Crystallographica Section E: Structure Reports Online | Year: 2014

The asymmetric unit of the title organic-inorganic molecular salt, C6H18N2 2+·SiF6 2-, consists of one anion and one cation together with half of each of two cations and two anions located on inversion centres. The SiF6 2- octahedral anions are arranged to form sheets parallel to (011), which are linked into a three-dimensional network by the organic cations through N-H.F hydrogen bonds. Source

Discover hidden collaborations