排序方式: 共有34条查询结果,搜索用时 15 毫秒
31.
Denise Barbier‐Baudry Aicha Bouazza Claire Hlne Brachais Alain Dormond Marc Visseaux 《Macromolecular rapid communications》2000,21(5):213-217
Lanthanides (samarium and ytterbium) tris and monobenzimidinates are efficient for the polymerization of ε‐caprolactone, the systems remaining active after consumption of the monomer. Nevertheless it is not a living polymerization because the benzimidinates are recovered. Evidence for support of the proposed catalytic cycle was obtained by NMR studies. 相似文献
32.
S. Bouazza Y. Guern R. Abjean J. Bauche 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1987,7(1):33-36
The magnetic hyperfine structure factorA of the quasi-totality of the levels of the low 4p 3 and 4p 25s configurations of As I has been measured by Fabry-Perot interferometry in the far UV range. A good agreement is observed between experimental results and theoretical evaluations, which allows us to confirm that the 4p 25s configuration only mixes very weakly (less than 1%) with 4s4p 4. 相似文献
33.
This work reports pressure-broadening line-wing and line-core of the lithium Li (2p $leftarrow$ 2s) resonance line perturbed by ground sodium Na (3s) atoms. In far-wing regions, the calculations are performed quantum-mechanically and are intended to examine the photoabsorption coefficients at diverse temperatures. The results show the existence of three satellites, in the blue wing near the wavelengths 470 nm and in the red wing around 862 nm and 1070 nm. For the line-core region, by adopting the simplified Baranger model, the line-width and line-shift rates are determined, and their variation law with temperature is examined. No published data were found to compare these results with. 相似文献
34.
Bouazza Fahsi Kouider Halim Benrahou Baghdad Krour Abdeloauhed Tounsi Samir Benyoucef E Abbas Adda Bedia 《Acta Mechanica Solida Sinica》2011,24(6):519-526
In this paper, the effect of time-dependent deformations (such as shrinkage and creep) on the interfacial stresses between an RC beam and FRP plate is presented. For this end, a closed-form solution for such stresses in externally FRP plated RC beams including creep and shrinkage effects is presented. The developed model is formulated to predict the interfacial stresses at time ‘t’, in which the RC beams have been already subjected to creep and shrinkage effects. The adherend shear deformations have been included in the present theoretical analysis by assuming a parabolic shear stress through the thickness of the RC beam and the FRP panel. Contrary to some existing studies, the assumption that both RC beam and FRP panel have the same curvature is not used in the present investigation. This research is helpful for the understanding on mechanical behavior of the interface and design of the FRP-RC hybrid structures. 相似文献