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Weighted Boundedness of Commutators of Generalized Calderón-Zygmund Operators

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Analysis in Theory and Applications 2018年第3期34卷 209-224页

作者： Cuilan Wu Yunjie Wang Lisheng Shu School of Mathematics and Statistics Jiangsu Normal University kewen Institute Jiangsu Normal University college of Mathematics and Computer Science Anhui Normal University

[b,T] denotes the commutator of generalized Calderon-Zygmund operators T with Lipschitz function b, where b∈Lip;（R;）,（0 <β≤1） and T is aθ（t）-type Calderón-Zygmund operator. The commutator [b,T] generated by b and T is defined by[b,T]f（x）=b（x）Tf（x）-T（bf）(x)=∫k（x,y）(b（x）-b（y）)f（y）*** this paper, the authors discuss the boundedness of the commutator [b, T] on weighted Hardy spaces and weighted Herz type Hardy spaces and prove that [b,T] is bounded from H;（ω;） to L;（ω;）, and from HK;(ω;,ω;) to K;(ω;,ω;). The results extend and generalize the well-known ones in [7].

关键词： Commutator Lipschitz function weighted hardy space Herz space

Highly Effective Detection of Amitraz in Honey by Using Surface-Enhanced Raman Scattering Spectroscopy Coupled with Chemometric Methods

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Chinese Journal of Chemical Physics 2019年第4期32卷 444-450,I0002页

作者： Xin-ming Nie Jing Wang Xun Wang Ya-ping Tian Si Chen Zhou-yang Long Cheng-hua Zong School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 China School of Chemistry and Materials Science Jiangsu Key Laboratory of Green Synthesis for Functional Materials Jiangsu Normal University Xuzhou 221116 China kewen college Jiangsu normal university Xuzhou 221116 China

As an effective and universal acaricide, amitraz is widely used on beehives against varroasis caused by the mite Varroa jacobsoni. Its residues in honey pose a great danger to human health. In this study, a sensitive, rapid, and environmentally friendly surface-enhanced Raman spectroscopy method (SERS) was developed for the determination of trace amount of amitraz in honey with the use of silver nanorod (AgNR) array substrate. The AgNR array substrate fabricated by an oblique angle deposition technique exhibited an excellent SERS activity with an enhancement factor of -10^7. Density function theory was employed to assign the characteristic peak of amitraz. The detection of amitraz was further explored and amitraz in honey at concentrations as low as 0.08 mg/kg can be identified. Specifically, partial least square regression analysis was employed to correlate the SERS spectra in full-wavelength with Camitraz to afford a multiple-quantitative amitraz predicting model. Preliminary results show that the predicted concentrations of amitraz in honey samples are in good agreement with their real concentrations. Compared with the conventional univariate quantitative model based on single peak’s intensity, the proposed multiple-quantitative predicting model integrates all the characteristic peaks of amitraz, thus offering an improved detecting accuracy and anti-interference ability.

关键词： Amitraz surface-enhanced Raman spectroscopy method Oblique angle deposition Honey Detection Sensing Ag nanorod Density function theory Partial least squares regression

Adaptive Predefined-Time Optimal Tracking Control for Underactuated Autonomous Underwater Vehicles

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IEEE/CAA Journal of Automatica Sinica 2023年第4期10卷 1083-1085页

作者： kewen Li Yongming Li college of Engineering Qufu Normal UniversityRizhao 276826China college of Science Liaoning University of TechnologyJinzhou 121000China

Dear Editor,This letter concentrated on the adaptive predefined-time optimal tracking control for underactuated autonomous underwater vehicles(AUVs).According to adaptive dynamic programming(ADP)with actor-critic neural networks(NNs),by constructing a novel barriertype cost function,an adaptive predefined-time optimal constraint control approach was developed.

关键词： networks neural optimal

Co-enhancement of thermal conduction and radiation through morphologies controlling of graphene functional layer for chip thermal management

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Nano Research 2024年第10期17卷 8885-8892页

作者： Shuting Cheng Kun Wang Shichen Xu Yi Cheng Ruojuan Liu kewen Huang Hao Yuan Wenjuan Li Yuyao Yang Fushun Liang Fan Yang Kangyi Zheng Zhiwei Liang Ce Tu Mengxiong Liu Xiaomin Yang Jingnan Wang Xuzhao Gai Yuejie Zhao Xiaobai Wang Yue Qi Zhongfan Liu State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249China Centre for Nanochemistry Beijing Science and Engineering Centre for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute(BGI) Beijing 100095China college of Energy Soochow Institute for Energy and Materials Innovations(SIEMIS)Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow UniversitySuzhou 215006China Department of Chemistry College of Chemistry and Materials EngineeringBeijing Technology and Business UniversityBeijing 100048China

With the continuous advancements in electronics towards downsizing and integration,efficient thermal dissipation from chips has emerged as a critical factor affecting their lifespan and operational *** fan-less chip cooling system has two critical interfaces for thermal transport,which are the contact interface between the base and the chip dominated by thermal conduction,and the surface of the fins dominated by thermal *** different thermal transfer modes of these two critical interfaces pose different requirements for thermal management *** the study,a novel approach was proposed by developing graphene thermal transport functional material whose morphology could be intentionally designed via reformed plasmaenhanced chemical vapor deposition(PECVD)methods to meet the diverse requirements of heat transfer ***,graphene with multilevel branching structure of vertical graphene(BVG)was fabricated through the hydrogenassisted PECVD(H_(2)-PECVD)strategy,which contributed a high emissivity of~*** was deposited on the fins’surface and functioned as the radiation enhanced layer to facilitate the rapid radiation of heat from the heat sinks into the surrounding ***,the well-oriented vertical graphene(OVG)was successfully prepared through the vertical electric field-assisted PECVD process(EF-PECVD),which showed a high directional thermal conductivity of~53.5 W·m^(-1)·K^(-1).OVG was deposited on the contact interface and functioned as the thermal conduction enhanced layer,allowing for the quick transmission of heat from the chip to the heat *** this design concept,the two critical interfaces in the chip cooling system can be jointly enhanced,resulting in a remarkable cooling efficiency enhancement of~30.7%,demonstrating that this novel material possessed enormous potential for enhancing the performance of cooling ***,this research not only provided new design concepts for the cooling system

关键词： chip thermal management thermal conduction thermal radiation graphene morphology control

Output-Feedback Based Simplified Optimized Backstepping Control for Strict-Feedback Systems with Input and State Constraints

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IEEE/CAA Journal of Automatica Sinica 2021年第6期8卷 1119-1132页

作者： Jiaxin Zhang kewen Li Yongming Li college of Science Liaoning University of TechnologyJinzhou 121001China Institute of Automation Qufu Normal UniversityQufu 273165China

In this paper,an adaptive neural-network(NN)output feedback optimal control problem is studied for a class of strict-feedback nonlinear systems with unknown internal dynamics,input saturation and state *** networks are used to approximate unknown internal dynamics and an adaptive NN state observer is developed to estimate immeasurable *** the framework of the backstepping design,by employing the actor-critic architecture and constructing the tan-type Barrier Lyapunov function(BLF),the virtual and actual optimal controllers are *** order to accomplish optimal control effectively,a simplified reinforcement learning(RL)algorithm is designed by deriving the updating laws from the negative gradient of a simple positive function,instead of employing existing optimal control *** addition,to ensure that all the signals in the closed-loop system are bounded and the output can follow the reference signal within a bounded error,all state variables are confined within their compact sets all ***,a simulation example is given to illustrate the effectiveness of the proposed control strategy.

关键词： Backstepping design immeasurable states neuralnetworks(NNs) optimal control state constraints

Software Defect Prediction Using Fuzzy Integral Fusion Based on GA-FM

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Wuhan University Journal of Natural Sciences 2014年第5期19卷 405-408页

作者： LI kewen CHEN Chenxi LIU Wenying Fang Xianghua LU Qinghua college of Computer and Communication Engineering China University of Petroleum

The fuzzy measure and fuzzy integral are applied to the classification of software defects in this paper. The fuzzy measure of software attributes and attributes＇ sets are treated by genetic algorithm, and then software attributes are fused by the Choquet fuzzy integral algorithm. Finally, the class labels of soft- ware modules can be output. Experimental results have shown that there are interactions between characteristic attributes of software modules, and also proved that the fuzzy integral fusing method using Fuzzy Measure based on Genetic Algorithm （GA-FM） can significantly improve the accuracy for software defect prediction.

关键词： defect prediction genetic algorithm fuzzy measure fuzzy integral

Vertical graphene-coated Cu wire for enhanced tolerance to high current density in power transmission

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Nano Research 2022年第11期15卷 9727-9733页

作者： Kun Wang Shuting Cheng Qingmei Hu Feng Yu Yi Cheng kewen Huang Hao Yuan Jun Jiang Wenjuan Li Junliang Li Shichen Xu Jianbo Yin Yue Qi Zhongfan Liu Center for Nanochemistry(CNC) Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute(BGI) Beijing 100095China State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249China

Cu wires(CuWs)are widely used as electric transmission ***,their limited thermal and chemical stabilities become challenges under the high-power and harsh *** is regarded as an ideal protective barrier for CuW benefiting from its impermeability to all atoms and ***,the excellent hydrophobicity of vertical graphene(VG)will strengthen its protective capability as a corrosion and oxidation ***,VG is directly synthesized on CuW by plasmaenhanced chemical vapor deposition *** hydrophobic VG coating with a high water contact angle can effectively exclude the corrosive liquid and moisture from CuW surface and prevent their further ***,the electrochemical corrosion rate of VG-CuW is reduced by~13,8,and 2 times,compared with bare CuW,VG-CuW with hydrophilic treatment,and CuW coated with thick horizontal graphene layers,*** oxidation occurs on VGCuW after the long-time exposure to humid air at~200℃ along with the largely enhanced tolerance under high-current operating *** study reveals the impressive potentials of hydrophobic VG as a robust corrosion and oxidation barrier for metal wires used in high-power cables and electronic devices in harsh environment.

关键词： vertical graphene Cu wire oxidation and corrosion plasma-enhanced chemical vapor deposition

Face Recognition Based on Convolution Neural Network 36

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Face Recognition Based on Convolution Neural Network

Kinetic study on reactive extraction for chiral separation of phenylsuccinic acid enantiomers

第36届中国控制会议

作者： kewen Yan Shaohui Huang Yaoxian Song Wei Liu Neng Fan School of Automation Hangzhou Dianzi University college of Control Science and Engineering Zhejiang University

ISBN: (纸本)9781538629185

In this paper,a face recognition method based on Convolution Neural Network（CNN） is *** network consists of three convolution layers,two pooling layers,two full-connected layers and one Softmax regression *** gradient descent algorithm is used to train the feature extractor and the classifier,which can extract the facial features and classify them *** Dropout method is used to solve the over-fitting *** Convolution Architecture For Feature Extraction framework（Caffe） is used during the training and testing *** face recognition rate of the ORL face database and AR face database based on this network is99.82%and 99.78%.

关键词： Face Recognition CNN Image Processing Caffe

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Science China Chemistry 2010年第11期53卷 2399-2406页

作者： TANG kewen MIAO JiaBing ZHOU Tao SONG LiTao Department of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang 414006China college of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

The kinetics of the extraction of phenylsuccinic acid(PSA) enantiomers by hydroxypropyl-β-cyclodextrin(HP-β-CD) in a modified Lewis cell was studied,in which HP-β-CD dissolved in 0.1 mol L-1 NaH2PO4/H3PO4 buffer solution(pH = 2.5) was selected as the chiral *** enantiomers were extracted from organic phase to aqueous phase in the extraction *** theory of extraction accompanied by a chemical reaction has been used to obtain the intrinsic kinetics of this extraction *** different parameters affecting the extraction rate such as agitation speed,interfacial area,initial concentration of PSA enantiomers in organic phase as well as HP-β-CD concentration in aqueous phase were separately *** experimental results demonstrate that the extraction reactions are *** reactions were found to be first order with respect to PSA and second order with respect to HP-β-CD with forward rate constants of 3.4 × 10-2 m6 mol-2 s-1 for R-PSA and 9.96 × 10?3 m6 mol-2 s-1 for *** data will be useful in the design of extraction processes.

关键词： kinetics reactive extraction chiral separation Lewis cell phenylsuccinic acid enantiomers