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51.
Kamel Hachama Mohamed Khodja Saad Moulay Hocine Boutoumi Lothar Hennig Dieter Sicker 《Journal of heterocyclic chemistry》2013,50(2):413-416
Five novel 3‐(2‐oxo‐2H‐benzo[b][1,4]oxazin‐3‐yl)propanoates were synthesized under mild conditions from 2‐aminophenols and dimethyl‐2‐oxoglutarate. Biological assays of these 1,4‐benzoxazinones were conducted with three bacterial strains and one yeast. All compounds were active against a Candida albicans ATCC 10231, whereas only methyl 3‐(6‐methyl‐2‐oxo‐2H‐benzo[b][1,4]oxazin‐3‐yl)propanoate showed a general moderate activity against the bacterial strains tested. 相似文献
52.
Houssem Boulebd Sana Zama Abdelmalek Bouraiou Sofiane Bouacida Hocine Merazig Ali Belfaitah 《Tetrahedron letters》2014
This study describes the reactivity of 2-halogeno-N-phenacylimidazolium salts towards active methylene species, arylamines and thiocyanate ions. The 2-chloro-N-phenacylimidazolium salt undergoes unexpected reactions in the presence of active methylene species and a tertiary amine as the base. The reaction of 2-bromo-N-phenacylimidazolium salts with arylamines led to a mixture of the corresponding 2-(arylamino)-N-phenacylimidazolium salts and imidazolone. The reaction of 2-bromo-N-phenacylimidazolium bromide with KSCN led to the corresponding imidazole-2-thione. The crystal structures of five compounds are reported. 相似文献
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This paper, motivated by transport theory, deals with spectral properties of operators G on a complex Hilbert space H such that SG is self-adjoint where S is a nonnegative operator: We give several lower bounds of the spectral radius of G and determine the latter in some cases. We derive the whole spectrum for power compact G by means of Lagrange multiplier theory. We find out spectral connections between G and SG. We give a (spectral) stability estimate for symmetrizable operators in terms of the spectral radius of the perturbation. 相似文献
55.
Hocine Guediri 《Mathematical Methods in the Applied Sciences》2002,25(2):93-114
A scalar contact problem with friction governed by the Yukawa equation is reduced to a boundary variational inequality. The presence of the non‐differentiable friction functional causes some difficulties when approximated. We present two methods to overcome this difficulty. The first one is a regularization leading to a non‐linear boundary variational equation, for which we propose an iterative procedure, whereas the second method is based on the boundary mixed variational formulation involving Lagrange multipliers. We propose Uzawa's algorithm to compute the saddle point of the corresponding boundary Lagrangian and investigate the discretization of various formulations by the boundary element Galerkin method. Convergence of the boundary element solution is proved and a convergence order is obtained. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
56.
Sihem Boufas Hocine Merazig Lamia Bendjeddou Georges Dns Adel Beghidja Anna Grazia Moliterni 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(1):i7-i9
Mg2Ru2Cl10O·16H2O {dimagnesium μ‐oxo‐bis[pentachlororuthenate(IV)] hexadecahydrate} crystallizes in the monoclinic system (space group P21/c). The structure consists of layers of [Ru2Cl10O]4− anions, [Mg(H2O)6]2+ cations and water molecules stacked along the a axis. Only the O atom bonded to Ru occupies the 2a site with symmetry. All the other atoms occupy general 4e sites. The crystal structure is stabilized by O—H⋯O and O—H⋯Cl interactions. 相似文献
57.
The phase diagrams of binary mixtures formed by 1-ethyl-3-methylimidazolium hexafluorophosphate ([emim][PF6]) and 2-phenylimidazole or 4,5-diphenylimidazole or 2,4,5-triphenylimidazole has been established using differential scanning calorimetry. Solutions containing 2,4,5-triphenylimidazole display phase splitting at high temperature range. 相似文献
58.
A. Hamdi M. Naït Abdelaziz N. Aït Hocine P. Heuillet N. Benseddiq 《Polymer Testing》2006,25(8):994-1005
In this work, we attempt to derive a fracture criterion for filled and unfilled elastomer vulcanizates and thermoplastics from a set of experimental data. Firstly, fracture criteria reported in the literature have been applied to experimental data obtained from tests including various loading modes (simple tension, equal biaxial tension and biaxial tension) and performed on four materials: a natural rubber (NR), a styrene butadiene rubber (SBR), a polyurethane (PU) and a thermoplastic elastomer (TPE).
Then, a new failure criterion based on an equivalent elongation concept is proposed. This equivalent elongation seems to be linearly dependent on a given biaxiality ratio n=(ln(λ2b)/ln(λ1b)), which leads to expressing the principal elongations at break as functions of both the biaxiality n and two experimental parameters. Quite good agreement is highlighted when comparing the failure experimental data with the proposed criterion for the tested elastomers. 相似文献
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