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Chinese Journal of Chemistry 2022年第13期40卷 1578-1584,I0002页

作者： Yueying Han Cheng Liu Huaping Xu yi cao Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructureKey Laboratory of Intelligent Optical Sensing and ManipulationMinistry of EducationDepartment of PhysicsNanjing UniversityNanjingJiangsu 210093China Jinan Microecological Biomedicine Shandong Laboratory JinanShandong 250021China Key Lab of Organic Optoelectronics and Molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084China

Hydrogels crosslinked by dynamic covalent bonds can effectively mimic the viscoelastic properties of native extracellular matrix and have been widely explored for 3D cell *** is one of the most common dynamic bonds in biological systems whose formation and cleavage are catalyzed by a set of dedicated ***,in vitro formation of disulfide bonds is a slow process and requires harsh ***,it is difficult to use disulfide crosslinked hydrogels for cell culture.n this work,we show that disulfide bonds can be formed by thiol-diselenide(Dise)exchange under blue light *** reaction is fast,reversible,and ***,residual diselenide in the hydrogel network can also accelerate thiol-disulfide exchange reactions leading to faster cell release from the hydrogels upon the addition of thiol-containing *** anticipate that disulfide crosslinked hydrogels catalyzed by diselenide can find broad biomedical applications,such as cell culture,celldelivery,and drug-controlled release.

关键词： Disulfide bonds Diselenide bonds Photocatalysis Gels Cellencapsulation

High-order breather,M-kink lump and semi-rational solutions of potential Kadomtsev-Petviashvili equation

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Communications in Theoretical Physics 2021年第3期73卷 28-35页

作者： Yulei cao yi Cheng Jingsong He yiren Chen School of Mathematical Sciences University of Science and Technology of ChinaHefeiAnhui 230026China Institute for Advanced Study Shenzhen UniversityShenzhenGuangdong 518060China College of Mathematics and Statistics Shenzhen UniversityShenzhenGuangdong 518060China

N-kink soliton and high-order synchronized breather solutions for potential Kadomtsev-Petviashvili equation are derived by means of the Hirota bilinear method,and the limit process of high-order synchronized breathers are ***,M-lump solutions are also presented by taking the long wave ***,a family of semi-rational solutions with elastic collision are generated by taking a long-wave limit of only a part of exponential functions,their interaction behaviors are shown by three-dimensional plots and contour plots.

关键词： PKP equation bilinear method breather Af-kink lump semi-rational solution

Machine-Learning-Assisted Optimization and Its Application to Antenna Designs: Opportunities and Challenges

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China Communications 2020年第4期17卷 152-164页

作者： Qi Wu yi cao Haiming Wang Wei Hong State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 211111China Purple Mountain Laboratories Nanjing 211111China

With the rapid development of modern wireless communications and radar, antennas and arrays are becoming more complex, therein having, e.g., more degrees of design freedom, integration and fabrication constraints and design objectives. While fullwave electromagnetic simulation can be very accurate and therefore essential to the design process, it is also very time consuming, which leads to many challenges for antenna design, optimization and sensitivity analysis(SA). Recently, machine-learning-assisted optimization(MLAO) has been widely introduced to accelerate the design process of antennas and arrays. Machine learning(ML) methods, including Gaussian process regression, support vector machine(SVM) and artificial neural networks(ANNs), have been applied to build surrogate models of antennas to achieve fast response prediction. With the help of these ML methods, various MLAO algorithms have been proposed for different applications. A comprehensive survey of recent advances in ML methods for antenna modeling is first presented. Then, algorithms for ML-assisted antenna design, including optimization and SA, are reviewed. Finally, some challenges facing future MLAO for antenna design are discussed.

关键词： Antenna designs machine learning optimization sensitivity analysis surrogate models

Weighted Composition Operators between Bergman Spaces with Exponential Weights

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Acta Mathematica Sinica,English Series 2022年第12期38卷 2231-2252页

作者： Guang Fu cao Li HE yi Yuan ZHANG School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006P.R.China

In this paper,we study some properties of weighted composition operators on a class of weighted Bergman spaces Ap with O 详细信息

In this paper,we study some properties of weighted composition operators on a class of weighted Bergman spaces Ap with O

关键词： Weighted composition operator boundedness compactness Schatten class Bergman spaces

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WAMS-based monitoring and control of Hopf bifurcations in multi-machine power systems

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第6期9卷 840-848页

作者： Shao-bu WANG Quan-yuan JIANG yi-jia cao School of Electrical Engineering Zhejiang University Hangzhou 310027 China

A method is proposed to monitor and control Hopf bifurcations in multi-machine power systems using the information from wide area measurement systems (WAMSs). The power method (PM) is adopted to compute the pair of conjugate eigenvalues with the algebraically largest real part and the corresponding eigenvectors of the Jacobian matrix of a power system. The distance between the current equilibrium point and the Hopf bifurcation set can be monitored dynamically by computing the pair of con- jugate eigenvalues. When the current equilibrium point is close to the Hopf bifurcation set, the approximate normal vector to the Hopf bifurcation set is computed and used as a direction to regulate control parameters to avoid a Hopf bifurcation in the power system described by differential algebraic equations (DAEs). The validity of the proposed method is demonstrated by regulating the reactive power loads in a 14-bus power system.

关键词： Wide area measurement system (WAMS) Hopf bifurcations Monitoring of bifurcations Control of bifurcations

LS-SVM model based nonlinear predictive control for MCFC system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 748-754页

作者： CHEN Yue-hua cao Guang-yi ZHU Xin-jian Institute of Fuel Cell Department of Automation Shanghai Jiao Tong University Shanghai 200030 China

This paper describes a nonlinear model predictive controller for regulating a molten carbonate fuel cell (MCFC). In order to improve MCFC’s generating performance, prolong its life and guarantee safety, it must be controlled efficiently. First, the output voltage of an MCFC stack is identified by a least squares support vector machine (LS-SVM) method with radial basis function (RBF) kernel so as to implement nonlinear predictive control. And then, the optimal control sequences are obtained by applying genetic algorithm (GA). The model and controller have been realized in the MATLAB environment. Simulation results indicated that the proposed controller exhibits satisfying control effect.

关键词： Molten carbonate fuel cell (MCFC) Least squares support vector machine (LS-SVM) Genetic algorithm (GA) Nonlinear predictive controller

Hybrid intelligent PID control design for PEMFC anode system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 552-557页

作者： Rui-min WANG ying-ying ZHANG Guang-yi cao Fuel Cell Institute Department of Automation Shanghai Jiao Tong University Shanghai 200030 China Institute of Oceanographic Instrument Shandong Academy of Science Qingdao 266001 China

Control design is important for proton exchange membrane fuel cell (PEMFC) generator. This work researched the anode system of a 60-kW PEMFC generator. Both anode pressure and humidity must be maintained at ideal levels during steady operation. In view of characteristics and requirements of the system, a hybrid intelligent PID controller is designed specifically based on dynamic simulation. A single neuron PI controller is used for anode humidity by adjusting the water injection to the hydrogen cell. Another incremental PID controller, based on the diagonal recurrent neural network (DRNN) dynamic identification, is used to control anode pressure to be more stable and exact by adjusting the hydrogen flow rate. This control strategy can avoid the coupling problem of the PEMFC and achieve a more adaptive ability. Simulation results showed that the control strategy can maintain both anode humidity and pressure at ideal levels regardless of variable load, nonlinear dynamic and coupling characteristics of the system. This work will give some guides for further control design and applications of the total PEMFC generator.

关键词： Proton exchange membrane fuel cell (PEMFC) Anode system Single neuron Diagonal recurrent neural network (DRNN) PID controller

A NEW CHROME GLYCOSIDE FROM SMILAX GLABRA ROXB

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Chinese Chemical Letters 1995年第7期6卷 587-588页

作者： cao, ZZ yi, YJ cao, Y Leng, ZK Nanjing Inst Mat Med Nanjing 210009 Peoples R China

A new chrome glycoside, 5,7-dihydroxychromone-3-O-L-rhamnopyranoside, named smiglanin, was isolated from the root of Smilax glabra collected in Lanxi, Zhejiang province. Its structure was elucidated by special data an...

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Correlation-aware probabilistic data summarization for large-scale multi-block scientific data visualization

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Computational Visual Media 2023年第3期9卷 513-529页

作者： Yang Yang Kecheng Lu Yu Wu Yunhai Wang yi cao Institute of Applied Physics and Computational Mathematics Beijing 100094China School of Computer Science and Technology Shandong UniversityQingdao 266237China

In this paper,we propose a correlationaware probabilistic data summarization technique to efficiently analyze and visualize large-scale multi-block volume data generated by massively parallel scientific *** core of our technique is correlation modeling of distribution representations of adjacent data blocks using copula functions and accurate data value estimation by combining numerical information,spatial location,and correlation distribution using Bayes’*** effectively preserves statistical properties without merging data blocks in different parallel computing nodes and repartitioning them,thus significantly reducing the computational ***,this enables reconstruction of the original data more accurately than existing *** demonstrate the effectiveness of our technique using six datasets,with the largest having one billion grid *** experimental results show that our approach reduces the data storage cost by approximately one order of magnitude compared to state-of-the-art methods while providing a higher reconstruction accuracy at a lower computational cost.

关键词： correlation-awareness large-scale data multi-block methods probabilistic data summarization

Synthesis of porous iron hydroxy phosphate from phosphate residue and its application as a Fenton-like catalyst for dye degradation

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Journal of Environmental Sciences 2022年第2期34卷 307-319页

作者： Weilin Guo yin cao yi Zhang Lijun Wang Lingxue Kong School of Environmental and Materials Engineering Shanghai Polytechnic UniversityShanghai 200240China Deakin University GeelongInstitutefor Frontier MaterialsVictoria 3216Australia Shanghai Innovation Institutefor Materials Shanghai 200444China

Phosphate residue is a kind of hazardous solid waste and if not properly disposed of, could cause serious environmental contaminations. The abundant iron salt available in phosphate residue can be used to prepare photo-Fenton catalytic reagent for wastewater treatment. In this study, the phosphate residue was effectively purified by a hydrothermal recrystallization method, reaching an iron phosphate purity of 94.2%. The particles of iron phosphate were further processed with ball milling with their average size reduced from 19.4 to 1.6 μm. By hydrothermal crystallization of iron phosphate and thermal decomposition of oxalate precursor, porous iron hydroxy phosphate was prepared. The modified porous iron hydroxy phosphate(m-PIHP) of higher surface area with iron oxalate on its surface can degrade 98.87% of Rhodamine B in 15 min. Cyclic experiment showed that the catalyst still had a good catalytic activity after six cycles( > 40%). The X-ray photoelectron spectroscopy results showed that the iron oxalate complex on the catalyst surface decomposed to produce ferrous ions and accelerated the rate of · OH production. The current work demonstrated that the m-PIHP synthesized from phosphate residue and modified with iron oxalate can be used as an effective dye wastewater treatment agent.

关键词： Phosphate residue Porous iron hydroxy phosphate Fenton-like ·OH