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Recyclable polymer functionalization via end-group modification and block/random copolymerization

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Green Energy & Environment 2021年第4期6卷 578-584页

作者： Yihuan liu Jiaqi Wu Huan Liang Zhao Jin Lianzhu Sheng Xin Hu Ning Zhu kai guo College of Biotechnology and Pharmaceutical Engineering Nanjing Tech UniversityNanjingJiangsu 211800China College of Materials Science and Engineering Nanjing Tech UniversityNanjingJiangsu 211800China State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjingJiangsu 211800China

Recyclable polymers offer a great opportunity to address the environmental issues of ***,functionalization of recyclable polymers,poly((R)-3,4-trans six-membered ring-fused GBL)(P((R)-M)),were reported via end-group modifications and block/random ***-n-butylmagnesium was selected to catalyze ring-opening polymerization(ROP)of(R)-M in the presence of a series of functional alcohols as the ***/random copolymerizations of(R)-M andε-caprolactone(ε-CL),L-lactide(L-LA)and trimethylene carbonate(TMC)were performed to control the onset decomposition temperature(T_(d)),melting temperature(T_(m))and glass transition temperature(T_(g)).These functionalized recyclable polymers would find broad applications as the sustainable plastics.

关键词： Recyclable polymers End-group modification Copolymerization Ring-opening polymerization

Predictive Control of High-Order Fully Actuated Nonlinear Systems with Time-Varying Delays

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Journal of Systems Science & Complexity 2022年第2期35卷 457-470页

作者： liu guo-Ping Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China

This paper investigates the control problem of high-order fully actuated nonlinear systems with time-varying delays in the discrete-time *** make the compensation for time-varying delays concise,active and universal,a novel nonlinear predictive control method is *** designed nonlinear predictive controller can achieve the same expected control performance as the nonlinear systems without *** the same time,the necessary and sufficient conditions for the stability of the closed-loop nonlinear predictive control systems are *** examples show that the proposed nonlinear predictive controller design method can completely compensate for the time-varying delays of nonlinear systems.

关键词： High-order fully actuated control systems nonlinear systems predictive control timevarying delays

Fluid inclusions in whiteschist in the ultrahigh-pressure metamorphic belt of Dabie Shan,China

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Chinese Science Bulletin 2002年第12期47卷 1028-1032页

作者： Hongrui Fan Jingbo liu Jinghui guo kai Ye Bolin Cong Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China

Hualiangting whiteschist in the Dabie Shan ultrahigh-pressure eclogite complex is a specific Mg-Al-rich metamorphic rock. Its protolith was a felsic dyke, which suffered replacement by high-pressure fluids during ec-logite-facies metamorphism. Based on fluid inclusion results in whiteschist, primary high-pressure fluids are CO2-bearing aqueous solutions. Those prove that there exists CO2-H2O fluid during the ultrahigh-pressure metamorphism. Pseu-dosecondary H2O inclusions were trapped during ultra-high-pressure exhumation, whereas secondary H2O inclusions were related to the latest evolutionary stage of the ultrahigh-pressure exhumation.

关键词： fluid inclusion whiteschist ultrahigh-pressure Dabie Shan.

Networked Learning Predictive Control of Nonlinear Cyber-Physical Systems

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Journal of Systems Science & Complexity 2020年第6期33卷 1719-1732页

作者： liu guo-Ping Department of Artificial Intelligence and Automation Wuhan UniversityWuhan 430072China

Cyber-physical systems integrate computing,network and physical environments to make the systems more efficient and cooperative,and have important and extensive application prospects,such as the Internet of *** paper studies the control problem of nonlinear cyber-physical systems with unknown dynamics and communication delays.A networked learning predictive control scheme is proposed for unknown nonlinear cyber-physical *** scheme recursively learns unknown system dynamics,actively compensates for communication delays and accurately tracks a desired *** multi-step predictors are presented to predict various step ahead outputs of the unknown nonlinear cyber-physical *** optimal design of controllers minimises a performance cost function which measures the tracking error predictions and control input increment *** system analysis leads to the stability criteria of closed-loop nonlinear cyber-physical systems employing the networked learning predictive control *** example illustrates the outcomes of the proposed scheme.

关键词： Cyber-physical systems learning control networked predictive control nonlinear systems

New Subsidiary Interaction Mode of Counteranions with the Periphery Cavity of Calix[4]pyrroles Binding with the Anion Subunits

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Chinese Chemical Letters 2006年第3期17卷 387-390页

作者： kai liu Yong guo Jian XU Shi Jun SHAO Sheng Xiang JIANG Key Laboratory for Natural Medicine of Gansu Province Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 Graduate School of the Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100039

The solution binding properties of calix[4]pyrroles with anion （as tetraalkylammonium salts） were investigated using UV-Vis spectroscopic techniques. The obvious red-shift of absorption maximum band of calix[4]pyrrole in EtOH in the presence of the tetramethylammonium （TMA^＋） salts or tetraethylammonium （TEA^＋） salts were observed, due to the charge-transfer interactions between the electron-rich pyrrole rings of calix[4]pyrroles and TMA^＋ or TEA^＋ cation subunit. The results indicated that calix[4]pyrrole receptors, which link the anionic species through multiple hydrogen bonding interactions, can use the periphery cavity for selectively binding cation subunits by cation-π charge-transfer interaction. The subsidiary interaction mode helps to further stabilize the calix[4]pyrrole-anion complex.

关键词： Anion recognition calixpyrrole charge-transfer interactions tetraalkylammonium salts.

Robust visual tracking via randomly projected instance learning

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International Journal of Intelligent Computing and Cybernetics 2017年第3期10卷 258-271页

作者： Fei Cheng kai liu Mao-guo Gong kaiyuan Fu Jiangbo Xi School of Computer Science and Technology Xidian UniversityXi’anChina School of Electronic Engineering Xidian UniversityXi’anChina School of Electrical and Computer Engineering Purdue UniversityWest LafayetteIndianaUSA

Purpose–The purpose of this paper is to design a robust tracking algorithm which is suitable for the real-time requirement and solves the mistake labeling issue in the appearance model of trackers with the spare ***/methodology/approach–This paper proposes a tracker to select the most discriminative randomly projected ferns and integrates a coarse-to-fine search strategy in this ***,the authors exploit multiple instance boosting learning to maximize the bag likelihood and select randomly projected fern from feature pool to degrade the effect of mistake ***,a coarse-to-fine search approach is first integrated into the framework of multiple instance learning(MIL)for less ***–The quantitative and qualitative experiments demonstrate that the tracker has shown favorable performance in efficiency and effective among the competitors of tracking ***/value–The proposed method selects the feature from the compressive domain by MIL AnyBoost and integrates the coarse-to-fine search strategy first to reduce the burden of *** paper designs a tracker with high speed and favorable results which is more suitable for real-time scene.

关键词： Multiple instance learning Randomly projected fern Search strategy

Tracking Control of Multi-Agent Systems Using a Networked Predictive PID Tracking Scheme

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IEEE/CAA Journal of Automatica Sinica 2023年第1期10卷 216-225页

作者： guo-Ping liu IEEE the Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

With the rapid development of network technology and control technology,a networked multi-agent control system is a key direction of modern industrial control systems,such as industrial Internet *** paper studies the tracking control problem of networked multi-agent systems with communication constraints,where each agent has no information on the dynamics of other agents except their outputs.A networked predictive proportional integral derivative(PPID)tracking scheme is proposed to achieve the desired tracking performance,compensate actively for communication delays,and simplify implementation in a distributed *** scheme combines the past,present and predictive information of neighbour agents to form a tracking error signal for each agent,and applies the proportional,integral,and derivative of the agent tracking error signal to control each individual *** criteria of the stability and output tracking consensus of multi-agent systems with the networked PPID tracking scheme are derived through detailed analysis on the closed-loop *** effectiveness of the networked PPID tracking scheme is illustrated via an example.

关键词： Coordinative tracking control networked multiagent systems PID control predictive control

The Static Stability Region of an Integrated Electricity-Gas System Considering Voltage and Gas Pressure

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Engineering 2024年第5期36卷 132-145页

作者： Yunfei Mu Zhibin liu Xiangwei guo Hongjie Jia kai Hou Xiaodan Yu Bofeng Luo Hairun Li Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China State Grid Tianjin Electric Power Company Tianjin 300201China China Southern Power Grid Digital Grid Research Institute Co. Ltd.Guangzhou 510700China

In an integrated electricity-gas system(IEGS),load fluctuations affect not only the voltage in the power system but also the gas pressure in the natural gas *** static voltage stability region(SVSR)method is a tool for analyzing the overall static voltage stability in a power ***,in an IEGS,the SVSR boundary may be overly optimistic because the gas pressure may collapse before the voltage ***,the SVSR method cannot be directly applied to an *** this paper,the concept of the SVSR is extended to the IEGS-static stability region(SSR)while considering voltage and gas ***,criteria for static gas pressure stability in a natural gas system are proposed,based on the static voltage stability criteria in a power ***,the IEGS-SSR is defined as a set of active power injections that satisfies multi-energy flow(MEF)equations and static voltage and gas pressure stability constraints in the active power injection space of natural gas-fired generator units(NGUs).To determine the IEGSSSR,a continuation MEF(CMEF)method is employed to trace the boundary point in one specific NGU scheduling direction.A multidimensional hyperplane sampling method is also proposed to sample the NGU scheduling directions *** obtained boundary points are further used to form the IEGSSSR in three-dimensional(3D)space via a Delaunay triangulation hypersurface fitting ***,the numerical results of typical case studies are presented to demonstrate that the proposed method can effectively form the IEGS-SSR,providing a tool for IEGS online monitoring and dispatching.

关键词： Integrated electricity-gas system Static stability region Continuation multi-energy flow Multidimensional hyperplane sampling

A Methodology for Comprehensive Quality Evaluation of Underground Space

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Acta Geologica Sinica(English Edition) 2024年第6期98卷 1637-1648页

作者： guo Junhan liu kai MA Yan Chinese Academy of Geological Sciences Beijing 100037China

Underground space resources are important for the purposes of urban sustainable development and are a significant means by which to realize three-dimensional urban development.A reasonable and scientific evaluation of underground space resources is the foundation for the rational use of land resources and urban *** the basis of the geological conditions used by preceding researchers,this study adds the analysis of two influencing factors of social and economic value,alongside existing facilities and protection *** evaluation index is quantified and the comprehensive quality evaluation system of underground space resources is ***,taking the Nanshan District of Shenzhen as an example,the evaluation of underground space resources is carried *** results show that for shallow underground space,the comprehensive quality of underground space resources development in Nanshan District is generally ***,Nanshan and Yuehai streets are recommended as areas to actively develop underground space,whereas the Qianhai and Houhai areas are recommended to be used with caution in the development and construction of their underground *** addition,this study also provides a reference for the purposes of underground space planning in the Nanshan district of Shenzhen.

关键词： underground space resources comprehensive quality evaluation geological suitability entropy weight optimization method