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Science China Chemistry 2018年第6期61卷 635-636页

作者： Anjun qin Center for Aggregation-Induced Emission State Key Laboratory of Luminescent Materials and Devices South China University of Technology

Luminescent materials with room-temperature phosphorescence(RTP)have drawn tremendous attention due to their remarkable advantages,such as long emission wavelength and lifetime,large Stokes shift,and high signal-noise ***,most RTP materials are inorganics or organometallic complexes containing expensive and toxic noble *** promote the development of the field of RTP,it is necessary and important to design and prepare metal-free RTP materials because of their potential applications in molecular switches,anti-counterfeiting,chemical sensors and biological imaging,etc.[1].

关键词：有机金属房间温度磷光小分子非结晶 RTP 光材料建筑群

A CONSTITUTIVE EQUATION SATISFYING THE NULL CONDITION FOR NONLINEAR COMPRESSIBLE ELASTICITY

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Chinese Annals of Mathematics,Series B 2002年第4期23卷 435-438页

作者： qin TIEHU Department of Mathematics Fudan University Shanghai 200433 China

This paper constructs a polyconvex stored energy function, satisfying the null condition, for isotropic compressible elastic materials with given Lame constants. The difference between this stored energy function and ... 详细信息

关键词： Compressible elasticity Stored energy function Null condition

Accelerate Bose–Einstein condensate by interaction

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Chinese Physics B 2019年第12期28卷 286-291页

作者： Jie-Li qin School of Physics and Electronic Engineering Guangzhou UniversityGuangzhou 510006China

In recent years,accelerating waves have attracted great research interests both due to their unique properties and tempting *** we investigate the effect of the inter-particle interaction on accelerating of Bose–Einstein condensate(BEC).We show that spatially homogeneous interactions will have no accelerating effect on BEC regardless of the interaction form(contact,dipole–dipole,or any others).But spatially inhomogeneous interactions may lead to an accelerating motion of the *** an example,the accelerating dynamic of BEC under a spatially linear modulated contact interaction is studied in *** is found that such an interaction will accelerate the condensate with a time varying ***,an interaction engineering scheme to achieve constantly accelerating BEC is proposed and studied *** results suggest that this engineering scheme can also suppress profile changing of the condensate during its evolution,thus realize an accelerating profile-keeping matter wave *** analysis also applies to optical waves with Kerr nonlinearity.

关键词： Bose–Einstein condensate interaction acceleration

From the Photochromic Metallacycles to the "Turn-On" Photo-Switchable Fluorescent Metallacycles

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Chinese Journal of Chemistry 2019年第5期37卷 531-532页

作者： Yi qin Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University 3663 North Zhongshan Road Shanghai 200062 China

Stimuli-responsive supramolecular self-assemblies have gained in creasing interests on acco unt of their exte nsive applicati ons in mimicking natural systems and materials science.[1-2] Our group has been interested in constructing diverse stimuli-responsive supramolecular assemblies and investigating their applications in sensing, catalysis and functional materials. As for the cleanest energy, light has always been chosen for the development of stimuli-responsive supramolecular self-assemblies.

关键词： materials group light

Simultaneous Determination of Two Types of Active Components with Different Physicochemical Properties in Kushen by HPLC-UV

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Chemical Research in Chinese Universities 2011年第3期27卷 375-379页

作者： ZHANG Yu-feng ZHAO qin-qin SHAO qin FAN Xiao-hui Department of Chinese Medicine Science&Engineering Zhejiang UniversityHangzhou 310058P.R.China

A simple, reliable and accurate high performance liquid chromatography(HPLC) coupled with a UV detector at varied wavelength was developed for the quantitation of two types of anti-carcinogenic compounds, namely, Kushen alkaloids(KS-As) and Kushen flavonoids(KS-Fs), in Kushen. Their remarkable difference in physicochemical properties was circumvented by integrated optimization of column and mobile phase. The separation was achieved on an alkaline-resisting C18 column via gradient elution with acetonitrile(ACN) and 0.025%(volume ratio) diethylamine(DEA) in water as mobile phase. The flow rate was 0.7 mL/min, and the column temperature was maintained at 35 °C. UV detection wavelength was set at 225 nm to monitor KS-As, and then changed to 335 nm for KS-Fs at 26th min, which was kept for 30 min before returning to the original wavelength. All the calibration curves show good linearity(r20.999) within test ranges. The intra- and inter-day precision values of these components were less than 3.82%, and the average recovery rates obtained were in a range of 97.24%―102.64% for all the samples with RSD below 3.94%. This assay was successfully applied to determining the major active components in commercial herbal samples of Kushen. Moreover, the possible relationship between sample and the geographical region was visualized based on the contents of the 6 compounds in the light of principal component analysis(PCA). The results suggest that the proposed method facilitates the quality control of Kushen.

关键词： Column liquid chromatography Sophora flavescen Kushen alkaloid Kushen flavonoid

Modeling of Strip Temperature in Rapid Cooling Section of Vertical Continuous Annealing Furnace

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Journal of Iron and Steel Research International 2012年第11期19卷 27-32页

作者： WAN Fei WANG Yong-qin qin Shu-ren State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China Baosteel Engineering and Technologies Group Co Ltd Shanghai 201900China

The strip temperature is affected by many factors in rapid cooling section （RCS） of the vertical continuous annealing furnace （VCAF）. They can he divided into four types： the physical properties of cooling gas, the geometry characteristics of configuration of cooling equipment, the heat transfer between the strip and the cooling gas, and the conductivity of the strip. It aims to model the strip temperature in the cooling section based on the fundamental heat transfer theory and the four aspects factors. The model for transient Nusselt number is obtained by considering Reynolds number, Prandtl number and geometry characteristics of RCS. Then cooling model of the strip transient temperature is built by Nusselt number, heat transfer coefficient and heat conductivity of the strip. The results are compared with the data from production line. The comparisons indicate that the model can well predict cooling temperature of the strip. It is hoped that the proposed model can be used for design and control of the vertical continuous annealing furnace.

关键词： rapid cooling jet impinging convection heat transfer coefficient

The Time-Dependent Von Kármán Shell Equation as a Limit of Three-Dimensional Nonlinear Elasticity

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Journal of Systems Science & Complexity 2021年第2期34卷 465-482页

作者： qin Yizhao YAO Peng-Fei Department of Mathematical Science Tsinghua UniversityBeijing 100084China Key Laboratory of Systems and Control Institute of Systems ScienceAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

The asymptotic behaviour of solutions of three-dimensional nonlinear elastodynamics in a thin shell is considered,as the thickness h of the shell tends to *** the appropriate scalings of the applied force and of the initial data in terms of h,it’s verified that three-dimesional solutions of the nonlinear elastodynamic equations converge to solutions of the time-dependent von Kármán equations or dynamic linear equations for shell of arbitrary geometry.

关键词： Nonlinear elasticity thin shell time-dependent von Kármán equations

Generous or Selfish? Weighing Transaction Forwarding Against Malicious Attacks in Payment Channel Networks

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Journal of Computer Science & Technology 2022年第4期37卷 888-905页

作者： Yi qin qin Hu Dong-Xiao Yu Xiu-Zhen Cheng School of Computer Science and Technology Shandong UniversityQingdao 266237China Department of Computer and Information Science Indiana University-Purdue University IndianapolisIndianapolis 46202U.S.A.

Scalability has long been a major challenge of cryptocurrency systems,which is mainly caused by the delay in reaching consensus when processing transactions *** an effective mitigation approach,the payment channel networks(PCNs)enable private channels among blockchain nodes to process transactions off-chain,relieving long-time waiting for the online transaction *** state-of-the-art studies of PCN focus on improving the efficiency and availability via optimizing routing,scheduling,and initial deposits,as well as preventing the system from security and privacy ***,the behavioral decision dynamics of blockchain nodes under potential malicious attacks is largely *** fill this gap,we employ the game theory to study the characteristics of channel interactions from both the micro and macro perspectives under the situation of channel depletion *** study is progressive,as we conduct the game-theoretic analysis of node behavioral characteristics from individuals to the whole population of *** analysis is complementary,since we utilize not only the classic game theory with the complete rationality assumption,but also the evolutionary game theory considering the limited rationality of players to portray the evolution of *** results of numerous simulation experiments verify the effectiveness of our analysis.

关键词： blockchain payment channel network game theory

Fully Actuated System Approach for 6DOF Spacecraft Control Based on Extended State Observer

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Journal of Systems Science & Complexity 2022年第2期35卷 604-622页

作者： ZHAO qin DUAN Guang-Ren Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China Center for Control Theory and Guidance Technology Harbin Institute of TechnologyHarbin 150001China

This paper deals with the problem of position and attitude tracking control for a rigid spacecraft.A fully actuated system(FAS)model for the six degree-of-freedom(6DOF)spacecraft motion is derived first from the state-space model by variable *** the uncertainties from external disturbance,unknown motion information,and uncertain inertia properties,an extended state observer(ESO)is designed to estimate the total ***,a tracking controller based on FAS approach is designed,and this makes the closed-loop system a constant linear one with an arbitrarily assignable *** solution to the parameter matrices of the observer and controller is given *** is proved via the Lyapunov stability theory that the observer errors and tracking errors both converge into the neighborhood of the ***,numerical simulation demonstrates the effectiveness of the proposed controller.

关键词： Constant linear closed-loop system extended state observer fully actuated system approach relative position and attitude control

Cyclicity of Degenerate Polycycles Through a Saddle-Node and Two Hyperbolic Saddles

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Acta Mathematica Sinica,English Series 2005年第3期21卷 507-516页

作者： Li qin ZHAO Department of Mathematics Beijing Normal UniversityBeijing 100875P.R.China

This paper deals with the cyclicity of a kind of degenerate planar polycycles through a saddle-node and two hyperbolic saddles, where the hyperbolicity ratio of the saddle （which connects the saddle-node with hp-connection） is equal to 1 and that of the other saddle is irrational. It is obtained that the cyclicity of this kind of polycycle is no more than 5 if the hp-connection keeps unbroken under the C^∞ perturbations.

关键词： Degenerate polycycle Cyclicity Finitely-smooth normal form Transition map