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Constantine, Algeria

Hebbachi R.,University of Mentouri Constantine | Mousser H.,Faculte des science de lIngenieur | Mousser A.,University of Mentouri Constantine
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

The title Schiff base compound, C25H19NO 2S, crystallizes in a statistically disordered structure comprising keto and enol tautomeric forms. In the enol form, the benzenoid arrangment is promoted by a strong intramolecular O - H⋯N hydrogen bond and adopts an E conformation about the imine bond. In the keto form there is an intramolecular N - H⋯O hydrogen bond. In the crystal, an extended network of C - H⋯O hydrogen bonds stabilizes columns parallel to the c axis, forming large voids (there are four cavities of 108 Å3 per unit cell) with highly disordered residual electron density. The SQUEEZE procedure in PLATON [Spek (2009). Acta Cryst. D65, 148-155] was used to eliminate the contribution of this electron density from the intensity data, and the solvent-free model was employed for the final refinement. The contribution of this undetermined solvent was ignored in the calculation of the unit-cell characteristics. Source

Ouali S.,Faculte des science de lIngenieur | Bentebbiche A.,University of Science and Technology Houari Boumediene | Belmrabet T.,Polytechnic School of Algiers
Journal of the Brazilian Society of Mechanical Sciences and Engineering | Year: 2015

A numerical simulation devoted to premixed methane-air low swirl stabilized flames obtained from a low swirl burner configuration is presented in this paper. A relatively wide range of methane-air equivalence ratios varying from 0.6 to 1.4 is considered. Several parameters identified as governing the flame structure, namely; velocity and temperature fields, methane (CH4) distribution and (thermal) nitric oxide (NO) formation are analyzed and compared to experimental available results. Turbulence is taken into account using RANS (Reynolds Average Navier–Stokes) standard k-ε model coupled to partially premixed model dedicated to combustion. Comparisons with literature results show satisfactory agreement for all studied flame parameters. It is particularly established that a compromise between maximum temperature and minimum (thermal) NO emissions can be ensured for low swirl burners with the flame maintained stable. Furthermore, several low swirl burners’ characteristics are recovered. © 2014, The Brazilian Society of Mechanical Sciences and Engineering. Source

Mousser H.,Faculte des science de lIngenieur | Amri R.,Faculte des science de lIngenieur | Madani A.,Faculte des science de lIngenieur | Darchen A.,CNRS Chemistry Institute of Rennes | Mousser A.,University of Mentouri Constantine
Applied Surface Science | Year: 2011

This work is a contribution to the microchemical surface analysis of two Numidian coins. Numidia was an ancient kingdom of northern Algeria during 2nd and 1st century BC. Investigations were performed with scanning electron microscopy (SEM) coupled with energy dispersive spectrometry (EDS), energy dispersive X-ray fluorescence spectrometry (EDXRF) and X-ray diffraction (XRD). The identification of the coins was done thanks to the name initials and effigy of King Massinissa. SEM observations of coins showed heterogeneous surfaces. SEM and EDXRF analyses showed an alloy structure with copper (65%), antimony (19%) and lead (16%). The XRD identified a metal structure and corrosion products which were on the coin surfaces: Litharge (PbO), Hydrocerussite (Pb 3(CO3)2(OH)2), Bindheimite (Pb 2Sb2O7) and Bystromite (MgSb2O 6). © 2011 Elsevier B.V. All rights reserved. Source

Merniz S.,University of Mentouri Constantine | Mokhtari M.,University of Oum El Bouaghi | Mousser H.,Faculte des science de lIngenieur | Ouahab L.,French National Center for Scientific Research | Mousser A.,University of Mentouri Constantine
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the title complex, [W(C3H6N2S)(CO) 5], the W atom displays an octa-hedral coordination with five CO mol-ecules and an imidazolidine-2-thione mol-ecule. The W(CO)5 unit is coordinated by the cyclic thione ligand through a W - S dative bond. The W - S and C - S bond lengths are 2.599 (2) and 1.711 (9) Å, respectively. This last distance is significantly longer than that of free cyclic thio-ureas. The geometry of the title compound suggests sp 3-hybridization of the S atom caused by the greatly polarized linkage W - S - C bond angle, which is close to tetra-hedral [109.50 (3)°]. In the crystal packing, N - H⋯O and N - H⋯S hydrogen-bonding inter-actions stabilize the structure and build up chains parallel to [101]. Source

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