排序方式: 共有29条查询结果,搜索用时 422 毫秒
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Singh Karamjeet Chebaane Saleh Ben Khalifa Sana Benabdallah Feres Ren Xiaobing Khemakhem Hamadi Grover Amit Singh Mehtab 《Wireless Networks》2022,28(3):1003-1016
Wireless Networks - Inter-satellite data transmission links are very crucial for providing global inter-connectivity. We report designing and investigations on high date rate inter-satellite... 相似文献
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F. Ammar-Khodja A. Benabdallah M. González-Burgos L. de Teresa 《Journal de Mathématiques Pures et Appliquées》2011,96(6):555-590
This paper is devoted to prove the controllability to trajectories of a system of n one-dimensional parabolic equations when the control is exerted on a part of the boundary by means of m controls. We give a general Kalman condition (necessary and sufficient) and also present a construction and sharp estimates of a biorthogonal family in L2(0,T;C) to {tje−Λkt}. 相似文献
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Farid Ammar Khodja Assia Benabdallah Manuel González-Burgos Luz de Teresa 《Comptes Rendus Mathematique》2014,352(5):391-396
We consider two parabolic equations coupled by a matrix A(x)=q(x)A0, where A0 is a Jordan block of order 1, and controlled by a single localized function, or by a single boundary control. The support of the coupling coefficient, q , and the control domain may be disjoint. We exhibit an explicit minimal time of null-controllability, T0(q)∈[0,+∞]. 相似文献
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Assia Benabdallah Yves Dermenjian Jrme Le Rousseau 《Journal of Functional Analysis》2011,260(12):357-3677
We consider anisotropic elliptic and parabolic operators in a bounded stratified media in Rn characterized by discontinuities of the coefficients in one direction. The surfaces of discontinuities cross the boundary of the domain. We prove Carleman estimates for these operators with an arbitrary observation region. 相似文献
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The Ramanujan Journal - In this paper, we establish a quicker approximation with continued fraction and some inequalities for the gamma function based on Windschitl’s formula. We also give... 相似文献
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The determination of total tin in water samples by graphite-furnace atomic absorption spectrometry is described. A matrix modifier containing 0.4% (w/v) potassium dichromate and 0.2% ammonium dihydrogenphosphate in 2% nitric acid is proposed. Interferences from major ions in natural fresh waters decreased and the sensitivity is greatly improved. The procedure is compatible with all the commercial injection devices and requires no pretreatment of the graphite furnace or use of a stabilized temperature platform. The 3σ detection limit is 0.62 ng Sn ml?1, and calibration is linear up to 30 ng ml?1 tin. 相似文献
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Sans résuméCe travail a beneficié du fond C.R.S.N.G.C. no A5591. 相似文献
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An improved, clean, simple, and efficient method for the synthesis of new series of 2-hydroxy-4-methylenenaphthalen-1(4H)-one is described. This new process involves a domino Michael addition of various methylene acid compounds with the sodium salt of 1,2-naphthoquinone-4-sulfonate either in basic (tBuOK) polyethylene glycol (PEG300) at room temperature or in a basic (NaOH) water–ethanol medium at 40 °C by a crushing in a mortar or a traditional heating. 相似文献