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Liu Cungen Gao Chuang Liu Xiaoping Wang Huanqing Zhou Yucheng 《Nonlinear dynamics》2021,104(4):3655-3670
Nonlinear Dynamics - This paper is devoted to the adaptive finite-time prescribed performance control (FTPPC) for stochastic nonlinear systems with unknown virtual control coefficients (UVCCs),... 相似文献
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Huanqing Chen Jiazeng Fan Xiaoshi Hu Junwei Ma Shilu Wang Jian Li Yihua Yu Xueshun Jia Chunju Li 《Chemical science》2015,6(1):197-202
To design and exploit novel macrocyclic synthetic receptors is a permanent and challenging topic in supramolecular chemistry. Here we describe the one-pot synthesis, unique geometries and intriguing host–guest properties of a new class of supramolecular macrocycles – biphen[n]arenes (n = 3, 4), which are made up of 4,4′-biphenol or 4,4′-biphenol ether units linked by methylene bridges at the 3- and 3′- positions. The biphenarene macrocycles are conveniently accessible/modifiable and extremely guest-friendly. Particularly, biphen[4]arene is capable of forming inclusion complexes with not only organic cationic guests but also neutral π-electron deficient molecules. Compared with calixarenes, resorcinarenes, cyclotriveratrylenes and pillararenes with substituted mono-benzene units, the biphen[n]arenes reported here possess significantly different characteristics in both their topologic structures and their recognition properties, and thus can find broad applications in supramolecular chemistry and other areas. 相似文献
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Suxiang Ma Huanqing Chen Prof. Dr. Jian Li Prof. Dr. Xueshun Jia Prof. Dr. Chunju Li 《化学:亚洲杂志》2016,11(23):3449-3453
Biphen[n]arenes (n=3, 4) are a new family of macrocyclic hosts. Here, we describe the molecular recognition behavior of hydroxylated biphen[4]arene (OHBP4) for the first time. A series of cationic guests with different sizes and shapes, including quaternary ammonium salts ( 1? PF6 and 2? PF6), pyridinium‐based guests ( 3? 2 PF6– 6? 2 PF6), and cobaltocenium hexafluorophosphate ( 7? PF6), were chosen as model guest molecules. OHBP4 exhibits good selectivity towards the 2,7‐dibutyldiazapyrenium bis(hexafluorophosphate) ( 4? 2 PF6) axle to form a [2]pseudorotaxane‐type complex. In contrast, hydroxylated biphen[3]arene (OHBP3) cannot bind with this big guest. In addition, OHBP4 strongly interacts with adamantane derivative 2? PF6 and cobaltocenium 7? PF6, which have tridimensional shape and relatively large size. The association constant of the 7 +?OHBP4 complex in 1:1 (v/v) [D6]acetone/CD2Cl2 solution is up to 3100±300 m ?1. 相似文献
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The energy spectra of heavy quark bound states are analyzed using the error-function-type potential and the one-gluon-exchange Coulomb-type force. The Debye screening mass at finite temperature and density is studied in the thermofield dynamics approach. The critical temperature and cridcal energy density for J/ψ dissociation in hot and dense matter are obtained. 相似文献
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用程函近似分析在高能核碰撞中次级作用对K+/π+比的影响.计算表明,在K+/π+比中次级碰撞效应是重要的. 相似文献
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Initial State Interactions and J/ψ Production-Rate Suppression in High Energy P-A Collisions 下载免费PDF全文
The influence of the initial state intcractions on the J/ψ production-rate supression in p-A collisions is studied. The incident proton energies decrease due to the inelastic interactions with the target nucleus. Considering energy loss of the incident proton,the data are well reproduced by using the final state interaction cross section σfabs=2.1mb. 相似文献
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Nonlinear Dynamics - The positional synchronization control problem is addressed for bilateral teleoperation systems subjected to system uncertainties, exogenous forces, unknown disturbances and... 相似文献