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排序方式: 共有95条查询结果,搜索用时 109 毫秒
1.
Larbi Berrahmoune 《Mathematical Methods in the Applied Sciences》2004,27(12):1385-1398
We consider an initial and boundary value problem for a homogenous string subject to an internal pointwise control. The solution resulting from a non‐linear feedback is studied. We give various explicit decay estimates depending on the control position and the feedback non‐linearity. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
2.
3.
Oularbi Larbi Turmine Mireille El Rhazi Mama 《Journal of Solid State Electrochemistry》2017,21(11):3289-3300
Journal of Solid State Electrochemistry - In this paper, a new nanocomposite of polypyrrole (PPy) and carbon nanofibers (CNFs)-modified carbon paste electrode (CPE) has been reported for the... 相似文献
4.
The ability to graft apatite surface by specific ligand fields creates powerful new technology applications. Thus, grafted organophosphonate can provide an effective route to modify the surface properties of apatite materials. The ability to decorate the apatite surface with the desired functionality requires covalent attachment to solid interface; most commonly achieved using organophosphonate self‐assembly. The current study shows that various phosphonates can react with calcium ions and control the formation of the porous apatite with high surface areas as well as the porosity. The structural and surface properties are given some importance in this review. 相似文献
5.
In reversed phase liquid chromatography (RP-LC), the validity of a multiparametric (MP) non-linear least-squares regression iterative method has been evaluated for 14 different aqueous mobile phases modified with one, two or three organic solvents [acetonitrile (ACN), methanol (MeOH), or tetrahydrofuran (THF)] for calculating the retention time of unretained compound t M and the regression parameter (slope b), based on the use of alkan-2-ones and alkyl aryl ketones homologous series. The determination of t M and b has been studied for eight binary (ACN?CH2O or MeOH?CH2O), 3 ternary (ACN?CMeOH?CH2O) and 3 quaternary (ACN?CMeOH?CTHF?CH2O) mobile phase systems on an Omnispher C18 column. The multiparametric calculated t M and b values were compared with those obtained by Guardino??s, and Grobler??s methods. The MP retention indices (RI) of ten monosubstituted benzenes with different functionality (hydroxyl, carbonyl, nitro, etc.) based on the alkan-2-ones retention index standards have been determined and compared for the different mobile phase compositions studied. The influence of organic modifier type, the nature of mobile phase system and water content on the variation of retention parameter studied in this work were discussed. 相似文献
6.
Belmesnaoui Aqzzouz Redouane Nouira Larbi Zraoula 《Rendiconti del Circolo Matematico di Palermo》2008,57(2):287-294
We give some sufficient and necessary conditions for that a positive Dunford-Pettis operator admits a dual operator which
is also Dunford-Pettis, and conversely.
相似文献
7.
We establish some sufficient and necessary conditions which give the compactness of positive Dunford–Pettis operators on Banach lattices. To cite this article: B. Aqzzouz et al., C. R. Acad. Sci. Paris, Ser. I 340 (2005). 相似文献
8.
Grégoire Fourrié Laurent Keirsbulck Larbi Labraga Patrick Gilliéron 《Experiments in fluids》2011,50(2):385-395
A passive flow control on a generic car model was experimentally studied. This control consists of a deflector placed on the
upper edge of the model rear window. The study was carried out in a wind tunnel at Reynolds numbers based on the model height
of 3.1 × 105 and 7.7 × 105. The flow was investigated via standard and stereoscopic particle image velocimetry, Kiel pressure probes and surface flow
visualization. The aerodynamic drag was measured using an external balance and calculated using a wake survey method. Drag
reductions up to 9% were obtained depending on the deflector angle. The deflector increases the separated region on the rear
window. The results show that when this separated region is wide enough, it disrupts the development of the counter-rotating
longitudinal vortices appearing on the lateral edges of the rear window. The current study suggests that flow control on such
geometries should consider all the flow structures that contribute to the model wake flow. 相似文献
9.
Stability analysis of jointed rock slope 总被引:2,自引:0,他引:2
The stability analysis of a jointed rock slope with two sets of unfilled joints, under its own weight, is carried out directly by considering failure surfaces along some particular joints and also going through the intact rock. Simple failure mechanisms using uniform rigid rock-block motions are incorporated in the yield design kinematic approach. They yield an improvement of known results as long as the characteristics strength of the joints are weak enough. 相似文献
10.
Mohammed Larbi Labbi 《Mathematische Nachrichten》2015,288(4):402-411
The Weitzenböck curvature operators are the curvature terms of order zero that appear in the well‐known classical Weitzenböck formula. In this paper, we use the formalism of double forms to prove a simple formula for these operators and to study their geometric properties. 相似文献