On parameter characteristics of chaotic synchronization in two nonlinear gyroscope systems

In this paper, the partial and full chaotic synchronizations of two nonlinear gyroscope systems with/without noise are investigated. From analytical conditions for synchronization and non-synchronization of two gyroscope systems, the parameter characteristic study is completed for a better understanding of the synchronization dynamics of two gyroscope dynamical systems. The boundaries of the parameter map for synchronization are determined by the onset and vanishing conditions of synchronization. The simple feedback control can make the noised gyroscope system synchronizing with chaotic behaviors of the expected gyroscope system. The methodology presented in this paper is different from other techniques for synchronization. The partial synchronization is an important phenomenon to be observed in engineering applications.     

α次积分半群的扰动

在n次积分半群及一次积分半群扰动理论的基础上,探讨了α次积分半群的扰动性,得到了α次积分半群的扰动定理.     

Coordinated motion of Lagrangian systems with auxiliary oscillators under cooperative and cooperative–competitive interactions

Nonlinear Dynamics - The present paper investigates coordinated oscillatory motion of networked Lagrangian systems under diverse interactions. Based on two new auxiliary oscillator systems, we...     

Palladium-catalyzed desulfitative addition of sodium sulfinates with α,β-unsaturated carbonyl compounds

A palladium-catalyzed desulfitative conjugate addition of sodium sulfinates with α,β-unsaturated carbonyl compounds is described. The reaction showed very good selectivity and tolerated a wide range of functionalities under an atmosphere of argon.     

Peroxide-mediated transition-metal-free direct amidation of alcohols with nitroarenes

An unusual direct amidation of alcohols with nitroarenes mediated by peroxides has been discovered. The reaction tolerated a wide range of functionalities, and various aromatic amides were obtained in moderate to good yields in the absence of transition-metal catalyst. The peroxides and solvents had a significant impact on the reaction yield.     

Ruthenium-catalyzed direct amination of alcohols with tertiary amines

A highly selective phosphine-based ruthenium catalyst system efficiently catalyzes the direct amination of alcohols with aliphatic tertiary amines, yielding unsymmetric tertiary amines in yields up to 87%. Ligand and solvent both affect the reaction yields significantly. The reaction can be performed with a wide variety of functionalities.     

Internal Oxidant‐Triggered Aerobic Oxygenation and Cyclization of Indoles under Copper Catalysis

A concise synthesis of pyrazolo[1,5‐a]indole derivatives by copper‐catalyzed aerobic oxygenation and cyclization of indoles with oxime acetates is described. This protocol represents an elegant example of N‐1, C‐2, and C‐3 tri‐functionalization of indoles in one‐pot. Mechanistic studies indicate the reaction proceeds through a radical procedure. Oximes as an internal oxidant have been demonstrated to be a driver to initiate aerobic oxidation, which provides a new oxidative pattern for C‐H functionalization even with high atom‐ and step‐economy.     

对镶在圆柱障板上单块有限复合板散射近场的研究

本文提出了预测镶在圆柱障板上一块具有三层加筋结构的复合材料有限板的振动特性和近场散射特性的理论模型。研究了在密介质中振动系统和入射声场的互作用以及不同振动之间由于辐射场引起的互耦合作用,数值计算了简支镶嵌在圆柱障板上的单块有限复合板的各种振动模式自耦合和互耦合系数,计算分析了有限复合板的振动再辐射近场特性。设计进行了测定有限复合板系统的近场实验。实验结果与理论计算结果符合较好。     

带相位飘移补偿器及防水包层的单模光纤水听器的特性

本文阐明一种能补偿相位飘移及在信号光纤上带防水包层的Mach-Zehnder型单模光纤水听器的特性。文中导出了保证阶跃型光纤的单模特性条件。由于它有聚四氟乙烯包层及单模特征,它在海中能保持良好的工作特性。对这种水听器的主要特性作了理论计算.并对相位飘移的补偿电路作了实际的分析,它开创了一种新型声呐（光声呐）.