Center Regional Des Metiers Of Leducation Et Of La Formation

Oujda, Morocco

Center Regional Des Metiers Of Leducation Et Of La Formation

Oujda, Morocco
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Ahl Laamara R.,Mohammed V University | Ahl Laamara R.,Center Regional Des Metiers Of Leducation Et Of La Formation | Loualidi M.A.,Mohammed V University | Miskaoui M.,Mohammed V University | Saidi E.H.,Mohammed V University
Nuclear Physics B | Year: 2017

We propose a supersymmetric SU(5)×Gf GUT model with flavor symmetry Gf=D4×U(1) providing a good description of fermion masses and mixing. The model has twenty eight free parameters, eighteen are fixed to produce approximative experimental values of the physical parameters in the quark and charged lepton sectors. In the neutrino sector, the TBM matrix is generated at leading order through type I seesaw mechanism, and the deviation from TBM studied to reconcile with the phenomenological values of the mixing angles. Other features in the charged sector such as Georgi–Jarlskog relations and CKM mixing matrix are also studied. © 2017 The Author(s)


Lambarki F.,Université Ibn Tofail | Ouasri A.,Université Ibn Tofail | Ouasri A.,Center Regional Des Metiers Of Leducation Et Of La Formation | Zouihri H.,Moulay Ismaï University | Rhandour A.,Université Ibn Tofail
Journal of Molecular Structure | Year: 2017

The crystal structure of [n-C3H7NH3]2BiCl5 compound is determined at 298 K in the orthorhombic system [Pbca; Z = 4; a = 12.6440(4) Å, b = 11.9209(3) Å, c = 21.9634(6) Å and V = 3310.50 (16) Å3]. The anionic sublattice of the crystal is made up of isolated Bi2Cl10 4− dimers composed of two equivalent slightly distorted BiCl6 3- octahedra sharing one edge. The organic part consists of two disordered propylammonium C3H7NH3 + cations which orient their amine groups to the neighboring anions. The infrared and Raman spectra were recorded at room temperature in 50–3500 and 450–4000 cm−1 frequency regions, respectively. The vibrational study confirms the presence of organic cations C3H7NH3 + and Bi2Cl10 4− dimers that are connected to each other by N[sbnd]H⋯Cl hydrogen bonding. The significant intermolecular interactions in the crystal structure are identified and analyzed using the Hirshfeld surface and fingerprint plots computational methods. © 2017 Elsevier B.V.


Ahl Laamara R.,Mohammed V University | Ahl Laamara R.,Center Regional Des Metiers Of Leducation Et Of La Formation | Mellal O.,Mohammed V University | Saidi E.H.,Mohammed V University
Nuclear Physics B | Year: 2017

In BPS quiver theory of N=2 supersymmetric pure gauge models with gauge invariance G, primitive BPS quivers Q0 G are of two types: Q0 ADE and Q0 BCFG. In this study, we first show that Q0 ADE have outer-automorphism symmetries inherited from the outer-automorphisms of the Dynkin diagrams of ADE Lie algebras. Then, we extend the usual folding operation of Dynkin diagrams ADE→BCFG to obtain the two following things: (i) relate Q0 BCFG quivers and their mutations to the Q0 ADE ones and their mutations; and (ii) link the BPS chambers of the N=2 ADE theories with the corresponding BCFG ones. As an illustration of this construction, we derive the BPS and anti-BPS states of the strong chambers Qstg G2 and Qstg F4 of the 4d N=2 pure G2 and F4 gauge models. © 2017 The Author(s)


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.


Ouasri A.,Center Regional Des Metiers Of Leducation Et Of La Formation | Ouasri A.,Université Ibn Tofail | Rhandour A.,Université Ibn Tofail | Saadi M.,Mohammed V University | El Ammari L.,Mohammed V University
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

The title organic-inorganic hybrid compound, {(C7H20N2)[BiCl5]} n , consists of distorted corner-joined [BiCl6] octahedra forming zigzag polymeric anionic chains parallel to [001], separated by columns of heptylenediammonium cations. The asymmetric unit contains two crystallographically independent bismuth metal atoms, one of which lies on an inversion centre and the other on a twofold axis. In the crystal, the polymeric chains and cations are linked by N - H⋯Cl hydrogen bonds, forming undulating layers parallel to (110).


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.


Ouasri A.,Center Regional Des Metiers Of Leducation Et Of La Formation
Chemistry | Year: 2016

This article aims to study the difficulties of the Moroccan high school pupils in teaching of the acid-base topic. Based on others similar context, particularly the Tunisian one, we have firstly carried out a classification of the knowledge objects relating to acid-base titrations in the empirical register and in the register of models. The analysis of the written productions of the pupils in situation of solving problem showed that the Moroccan pupils in classes of second Baccalaureate encountered difficulties to appropriate the knowledge objects relating to weak acide-strong base titrations and to adapt these knowledge as well as with the empirical register and with the register of models.


Ouasri A.,Center Regional Des Metiers Of Leducation Et Of La Formation | Ouasri A.,Université Ibn Tofail | Rhandour A.,Université 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.


Ouasri A.,Université Ibn Tofail | Ouasri A.,Center Regional Des Metiers Of Leducation Et Of La Formation | Jeghnou H.,Université Ibn Tofail | Rhandour A.,Université Ibn Tofail | Roussel P.,CNRS Laboratory of Catalysis and Solid State Chemistry
Journal of Solid State Chemistry | Year: 2013

The crystal structure of [NH3(CH2)6NH 3]BiCl5 was determined at: 223 K [P212 121 (Z=4), a=7.788(1), b=13.886(2), c=13.972(2) Å], 308 K [P21/n (Z=8), a=19.972(3), b=7.772(2), c=20.166(3) Å, β=92.32(1)°] and 378 K [Pnma (Z=4), a=13911(2), b=7.834(7), c=14.457(2) Å]. It was consisted of isolated (BiCl52-) n anionic chains composed by distorted octahedra BiCl 63- sharing two corners and +NH 3(CH2)6NH3+ cations placed in the free cavities between anionic chains. In the β phase, there are two crystallographically inequivalent cations and two one-dimensional anionic chains (BiCl52-)n in which BiCl 63- octahedra was doubly tilted and simply tilted. Two structural phase transitions at low and high temperatures α (P2 12121, 223 K)↔β (P21/n, 308 K)↔γ (Pnma, 373 K) are observed and discussed. It was crystallographically showed that both anionic and cationic entities contribute to phase transitions mechanisms. The BiCl63- octahedra were found to posses significant distortions on decreasing temperature and became more distorted in α (223 K) phase. It is argued that these deformations are caused by weak to moderate NH···Cl hydrogen bonding. © 2013 Elsevier Inc.


El Moussaouy A.,University Mohammed Premier | El Moussaouy A.,Center Regional Des Metiers Of Leducation Et Of La Formation | Ouchani N.,Center Regional Des Metiers Of Leducation Et Of La Formation
Physica B: Condensed Matter | Year: 2014

We studied theoretically the effects of hydrostatic pressure and temperature on the binding energy of shallow hydrogenic impurity in a cylindrical quantum dot (QD) using a variational approach within the effective mass approximation. The hydrostatic stress was applied along the QD growth axis. The interactions between the charge carriers and confined longitudinal optical (LO) phonon modes are taken into account. The numerical computation for GaAs/Ga1-x AlxAs QD has shown that the binding energy with and without the polaronic correction depends on the location of the impurity and the pressure effect and it is more pronounced for impurities in the QD center. Both the binding energy and the polaronic contribution increase linearly with increasing stress. For each pressure value, these energies are also found to decrease as the temperature increases. The results obtained show that in experimental studies of optical and electronic properties of QDs, the effects of pressure, temperature and polaronic correction on donor impurity binding energy should be taken into consideration. © 2013 Elsevier B.V.

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