排序方式: 共有14条查询结果,搜索用时 453 毫秒
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Sopian Kamaruzzaman Alwaeli Ali H. A. Al-Shamani Ali Najah Elbreki A. M. 《Journal of Thermal Analysis and Calorimetry》2019,136(1):147-157
Journal of Thermal Analysis and Calorimetry - The temperature rise in photovoltaic cells causing drop in their open-circuit voltage is a serious issue to be dealt with. A wide range of cooling... 相似文献
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Hyperbranched calix[4] (4) and calix[4]-dendrimer (5) as a second generation (G2) of calixdendrimers have been synthesized by divergent and convergent synthesis via amidation reactions. 相似文献
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Harry Adams Simon Jones Anthony J.H.M. Meijer Zaid Najah Isaac Ojea-Jiménez Andrew T. Reeder 《Tetrahedron: Asymmetry》2011,22(16-17):1620-1625
Excellent regio- and diastereoselectivity were achieved in the microwave assisted Diels–Alder reaction between (S)-9-(1-methoxyethyl) anthracene and 2-cyclopenten-1-one. The addition of Grignard reagents to the ketone cycloadduct gave poor levels of diastereoselectivity, however, the reduction was significantly more stereoselective. Flash vacuum pyrolysis of the reduced material furnished the corresponding allylic alcohol in good yield and ee. 相似文献
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Najah Yousfi Pierre Melchior Patrick Lanusse Nabil Derbel Alain Oustaloup 《Nonlinear dynamics》2014,76(1):447-457
In this paper, motion control and robust path tracking were extended to nonsquare MIMO (Multi-Input Multi-Output) systems having more outputs than inputs. A path-tracking design based on fractional prefilter approach has been developed and extended to control nonsquare MIMO systems. The nonsquare relative gain array (NRG) is used to assess the performance of nonsquare control systems based on steady-state information. The CRONE control approach developed for multivariable plants based on third-generation SISO CRONE methodology is combined with MIMO-QFT (Quantitative Feedback Theory) robust design methodology, taking into account the plant uncertainties. After the determination of CRONE controller, the parameter of prefilter has been optimized considering physical constraints of actuators and the tracking performance specifications. The proposed design is applied to an example. 相似文献
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Lassaad Baklouti Najah Cheriaa Mouna Mahouachi Rym Abidi Jong Seung Kim Yang Kim Jacques Vicens 《Journal of inclusion phenomena and macrocyclic chemistry》2006,54(1-2):1-7
This timely review focuses on the synthesis of dendrimers from calix[4]arenes and thiacalix[4]arenes. Some interesting features
of these calix-dendrimers are given. 相似文献
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Najah Cheriaa Mouna Mahouachi Amel Ben Othman Lassaad Baklouti Yang Kim Rym Abidi 《Supramolecular chemistry》2013,25(3):265-271
A new family of hyperbranched molecules and dendrimers has been constructed from a diamide–dicalix derivative prepared from monocarbomethoxymethyl p-tert-butyl calix[4]arene and tris(2-aminoethyl)amine (‘tren’) via amide-formation reactions. The selective 1,3-di-O-functionalization of p-tert-butyl calix[4]arene moieties allows the synthesis of first- (G1) and second-generation (G2) calix-dendrimers. Replacement of the quadridentate amine by a trithia-ether-triamine-mono-ol, ’hyten’, again results in acylation of the amino groups, but with the generation of a central cavity with different complexing properties. A new family of hyperbranched molecules and dendrimers has been constructed from a diamide–dicalix derivative prepared from monocarbomethoxymethyl p-tert-butyl calix[4]arene and tris(2-aminoethyl)amine (‘tren’) via amide-formation reactions. The selective 1,3-di-O-functionalization of p-tert-butyl calix[4]arene moieties allows the synthesis of first- (G1) and second-generation (G2) calix-dendrimers 相似文献
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Najah Yousfi Pierre Melchior Chokri Rekik Nabil Derbel Alain Oustaloup 《Nonlinear dynamics》2013,71(4):701-712
To perfectly govern MIMO (Multi-Input Multi-Output) processes, a fully populated matrix controller has been developed due to its flexibility. Taking into account the plant uncertainties, the CRONE (Commande Robuste d’Ordre Non Entier) control approach is used with the non-diagonal quantitative feedback theory (QFT) procedure. The MIMO-QFT robust synthesis methodology has been used in order to generate the appropriate equivalent MISO (Multi-Input Single-Output) system structure from the MIMO plant. For each MISO structure, the CRONE control approach based on third-generation CRONE methodology is used to find the diagonal elements of the controller of the plant while considering the plant uncertainties. The non-diagonal part of the controller is determined to reach the aim of minimizing the coupling effects. After that, a fractional prefilter synthesis approach is developed to find the non-integer prefilter expression satisfying the tracking specifications. A SCARA robot manipulator has been used to verify the designed controller performances. 相似文献
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Najah Cheriaa Rym Abidi Jacques Vicens 《Journal of inclusion phenomena and macrocyclic chemistry》2008,60(3-4):303-312
Four imidazolyl acetamido p-tert-butylcalix[4]arenes 5–8 have been prepared by reacting the corresponding methyl esters derivatives 1–4 with histamine in 1:1 mixture of methanol:toluene. The yields ranged from 56 to 68%. 5–8 have been shown to be in cone conformation. The complexation behaviour of 5–8 towards monovalent metal picrates M+Pic− with M+ = Li+, Na+, K+, Rb+ and Cs+ and divalent metal picrates M2+(Pic−)2 with M2+ = Mg2+, Ca2+, Sr2+, Ba2+, Pb2+, Cd2+, Zn2+ and Co2+ are given. Tentative localisation of the metal cations in the receptors is given. The binding properties towards these cations
have been determined along with stoichiometries of the complexes. 相似文献
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Najah Cheriaa Rym Abidi Jacques Vicens 《Journal of inclusion phenomena and macrocyclic chemistry》2008,62(3-4):223-229
The synthesis of a new di-imidazolyl-di-methoxy acetamido p-tert-butylcalix[4]arene 4 is reported. 4 has been prepared by reacting the corresponding di-methyl ester di-methoxy derivative with histamine in 1:1 mixture of methanol: toluene. The binding properties of 4 towards alkali, alkaline earth, transition (Zn2+, Co2+) and heavy (Pb2+, Cd2+) metals have been investigated along with the complexes stoichiometries. The 1H-NMR spectra of complexes show the location of cations in receptor 4. Partial cone conformation is observed only with strontium and calcium whereas the cone conformation is detected with most of the cations. Comparison of the complexation results with those obtained for di-imidazolyl acetamido p-tert-butylcalix[4]arene 3 missing the methyl groups is also reported. 相似文献