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Communications in Theoretical Physics 2022年第8期74卷 56-68页

作者： Jin-Jin Mao Shou-fu tian tian-Zhou Xu Lin-Fei Shi School of Mathematics and Statistics Beijing Institute of TechnologyBeijing 100081China School of Mathematics China University of Mining and TechnologyXuzhou 221116China

The present work studies the inverse scattering transforms(IST)of the inhomogeneous fifth-order nonlinear Schrodinger(NLS)equation with zero boundary conditions(ZBCs)and nonzero boundary conditions(NZBCs).Firstly,the bound-state solitons of the inhomogeneous fifth-order NLS equation with ZBCs are derived by the residue theorem and the Laurent's series for the first ***,by combining with the robust IST,the Riemann-Hilbert(RH)problem of the inhomogeneous fifth-order NLS equation with NZBCs is ***,based on the resulting RH problem,some new rogue wave solutions of the inhomogeneous fifth-order NLS equation are found by the Darboux ***,some corresponding graphs are given by selecting appropriate parameters to further analyze the unreported dynamic characteristics of the corresponding solutions.

关键词： the inhomogeneous fifth-order nonlinear Schrodinger equation inverse scattering transforms Darboux transformation bound-state soliton rogue wave zero/nonzero boundary conditions

High-resolution Load Profile Clustering Approach Based on Dynamic Largest Triangle Three Buckets and Multiscale Dynamic Warping Path Under Limited Warping Path Length

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Journal of Modern Power Systems and Clean Energy 2023年第5期11卷 1576-1584页

作者： Mi Wen yue Ma Weina Zhang Yingjie tian Yanfei Wang College of Computer Science and Technology Shanghai University of Electric PowerShanghaiChina Shanghai Electric Power Research Institute ShanghaiChina

With the popularity of smart meters and the growing availability of high-resolution load data, the research on the dynamics of electricity consumption at finely resolved timescales has become increasingly popular. Many existing algorithms underperform when clustering load profiles contain a large number of feature points. In addition, it is difficult to accurately describe the similarity of profile shapes when load sequences have large fluctuations, leading to inaccurate clustering results. To this end, this paper proposes a high-resolution load profile clustering approach based on dynamic largest triangle three buckets(LTTBs) and multiscale dynamic time warping under limited warping path length(LDTW). Dynamic LTTB is a novel dimensionality reduction algorithm based on LTTB. New sequences are constructed by dynamically dividing the intervals of significant feature points. The extraction of fluctuation characteristics is optimized. New curves with more concentrated features will be applied to the subsequent clustering. The proposed multiscale LDTW is used to generate a similarity matrix for spectral clustering, providing a more comprehensive and flexible matching method to characterize the similarity of load profiles. Thus, the clustering effect of a high-resolution load profile is improved. The proposed approach has been applied to multiple datasets. Experiment results demonstrate that the proposed approach significantly improves the Davies-Bouldin indicator(DBI) and validity index(VI). Therefore, better similarity and accuracy can be achieved using high-resolution load profile clustering.

关键词： Load profile clustering largest triangle three buckets(LTTB) dynamic time warping(DTW) spectral clustering

Spatial Pattern of Female Non-agricultural Employment and Its Driving Forces in Guangdong Province,China:A Perspective of Individual and Family-level

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Chinese Geographical Science 2020年第4期30卷 725-735页

作者： fu Zhanhui MEI Lin LIU Yanjun tian Junfeng ZHENG Rumin tian Jing School of Geography Science Northeast Normal UniversityChangchun 130024China School of Earth Science Jilin UniversityChangchun 130061China School of Tourism Management Zhengzhou UniversityZhengzhou 450001

Promoting women’s employment is not only the need of social and economic development,but also the historical mission of liberating *** paper uses data from the 1%Population Sample Survey,taken in Guangdong Province in 2015,to explore how women’s marital status,education,and family environment affect the female non-agricultural employment rate(FNAER)on a county scale using a spatial-lag *** results show that:1)The female non-agricultural employment rate in counties of Guangdong Province is low,with more than three-quarters of counties having female non-agricultural employment rate less than 50%.Moreover,the spatial distribution of FNAER is uneven,with the high-value areas concentrated in the southeast and the low-value areas mainly distributed in the central and western parts of Guangdong Province.2)From the perspective of industry,there are significant spatial differences among *** the southeast,women are mainly engaged in the secondary industry,while in the central and western regions,women are mainly engaged in the tertiary industry.3)Women having better skills and more effective support from the elderly can improve the *** having lower skills,smaller-scale families,a higher fertility rate,and households with two or more elderly members have a negative effect on the FNAER.4)Public policies suggest that improving women’s education and their family environment,building social welfare facilities,and repairing the family environment will increase the FNAER.

关键词： female non-agricultural employment(FNAER) spatial distribution driving factors family environment individual characteristics Guangdong Province China

Time-series analysis of the characteristic pressure fluctuations in a conical fluidized bed with negative pressure

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Chinese Journal of Chemical Engineering 2021年第4期34卷 87-99页

作者： Sheng Fang Yanding Wei Lei fu Geng tian Haibin Qu The State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China

The negative pressure conical fluidized bed is widely used in the pharmaceutical *** this study,experiments based on the negative pressure conical fluidized bed are carried out by changing the material mass and particle *** pressure fluctuation signals are analyzed by the time and the frequency domain methods.A method for absolutely characterizing the degree of the energy concentration at the main frequency is proposed,where the calculation is to divide the original power spectrum by the average signal power.A phenomenon where the gas velocity curve temporarily stops growing is observed when the material mass is light,and the particle size is *** standard deviation and kurtosis both rapidly change at the minimum fluidization velocity and thus can be used to determine the flow regime,and the variation rule of the kurtosis is independent of both the material mass and particle *** the initial fluidization stage,the dominant pressure signal comes from the material movement;with the increase in the gas velocity,the power of a 2.5 Hz signal continues to increase.A method of dividing the main frequency by the average cycle frequency can conveniently determine the fluidized state,and a novel concept called stable fluidized zone proposed in this paper can be *** the gas velocity within the stable fluidized zone ensures that the fluidized bed consistently remains in a stable fluidized state.

关键词： Conical fluidized bed Negative pressure Pressure fluctuation Time-series analysis Characteristic value Fluidized state

A novel structure of quasi-monolayered NiCo-bimetal-phosphide for superior electrochemical performance

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Journal of Energy Chemistry 2022年第11期31卷 203-211,I0007页

作者： Long Zhao Ming Wen Yakun tian Qingsheng Wu Yongqing fu School of Chemical Science and Engineering Shanghai Key Laboratory of Chemical Assessment and SustainabilityState Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Faculty of Engineering and Environment Northumbria UniversityNewcastle upon TyneNE18STUnited Kingdom

Bimetallic transition metal phosphides(TMPs)as potential candidates for superior electrochemical performance are still facing great challenges in the controllable preparation of two-dimensional(2 D)structures with high aspect ***,a novel structure of quasi-monolayered NiCo-bimetal-phosphide(NiCoP)has been designed and successfully synthesized by the newly developed process combined with ultrasonic-cavitation and *** is the first time to break through the controllable preparation of 2 D bimetal-phosphides with a thickness of 0.98 nm in *** on the advantages of 2 D quasi-monolayer structure with dense crystalline-amorphous interface and the reconfigured electronic structure between Ni^(δ+)/Co^(δ+)and P^(δ-),the optimized Ni_(5%)CoP exhibits an outstanding bifunctional performance for electrocatalyzing both hydrogen evolution reaction and oxygen evolution reaction in an alkaline ***_(5%)CoP presents lower overpotentials and voltage of 84 mV&259 mV and1.48 V at the current density of 10 mA cm^(-2)for HER&DER and overall water splitting,respectively,which are superior to most other reported 2 D *** work provides a new strategy to optimize the performance of electrolytic water for bimetal-phosphates and it may be of significant value in extending the design of other ultrathin 2 D structured catalysts.

关键词： 2D quasi-monolayer Hydrogen evolution reaction Bimetal phosphide Oxygen evolution reaction Ultrasonic-cavitation

Controllable Preparation of Branched Polyolefins with Various Microstructural Units via Chain-walking Ethylene and Pentene Polymerizations

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Chinese Journal of Polymer Science 2023年第6期41卷 905-914,I0008页

作者： Hong-Ju Liu Wan-Lu tian Xiao-yue Wang Tong Lei Pei Li Guo-Yong Xu Chao Li Shao-Jie Zhang fu-Zhou Wang Institutes of Physical Science and Information Technology School of Computer Science and TechnologyAnhui UniversityHefei 230601China

Branched polyolefins with controllable topology structures were generated from the chain-walking(co)polymerizations of ethylene,1-pentene(1P)and 2-pentene(2P)using Brookhart-typeα-diimine Ni(II)-based catalysts possessing different para-substituted groups,{[(4-R-2-Et-6-Me-C6H2N=C)2Nap]NiBr2,Nap:1,8-naphthdiyl;R=CHMePh,Ni1;R=Ph,Ni2;R=H,Ni3}.The X-ray diffraction analysis demonstrated that the crystalline structure of Ni1′is in centrosymmetric dimer structure mode with the bimetallic Ni center connected by two bromide *** para-sec-phenethyl moiety in the catalyst Ni1 obviously improved its catalytic performance and thermal stability in the ethylene *** Ni1/Et2AlCl system showed great catalytic activities(up to 7.73×106 g·mol-1·h-1)and achieved polyethylene(PE)with alkyl chains,including Me,Et,n-Pr,n-Bu,sec-Bu branches and longer chains(Lg).Compared with the 1-pentene polymerization,this catalyst system successfully mediated the polymerization of 2P to give highly branched polymers with approximately 195 branches/1000C possessing Me,Et,and n-Pr branches and a long methylene sequence due to the monomer *** Et branches derived from 2,3-insertion is slightly less than the sum of Me and n-Pr branches derived from 3,2-insertion,indicating that the 3,2-insertion mode is a slightly favorable pathway in the polymerization of 2P.

关键词： polymerization insertion chains

CaCO_(3)-MnSiO_(x)hybrid particles to enable CO_(2)-mediated combinational tumor therapy

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Nano Research 2022年第9期15卷 8281-8290页

作者： Congkun Xie tian Zhang Yike fu Gaorong Han Xiang Li State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhouZhejiang 310027China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311200China

Nanocatalysts mediated reactive oxygen species(ROS)based therapy has been exploited as an alternative therapeutic modality of tumor with high specificity and minimal side ***,the treatment outcome is limited by the efficiency of local catalytic ***,we report a novel type of core–shell hybrid nanoparticles(CaCO_(3)@MS),consisting of CaCO_(3)and MnSiO_(x),for synergistic tumor inhibition combining enhanced catalytic effect and calcium *** this system,MnSiO_(x)serves as catalysts with glutathione(GSH)responsive Mn^(2+)ions release ***_(3)nanoparticles play three important roles,including carbon dioxide(CO_(2))donor,pH modulator,and Ca^(2+)overload *** is found that the CaCO_(3)nanoparticles can induce CO_(2)production and pH increase in acidic tumor environment,both of which promote Mn^(2+)mediated ROS *** simultaneous release of Ca^(2+)ions from CaCO_(3)triggers calcium overload in tumor,which functions collaboratively with excessive ROS to induce cancer cell *** results demonstrate that after treatment with CaCO_(3)@MS,a remarkable tumor inhibition was achieved both in vitro and in vivo,while no clear toxic effect was *** study has therefore provided a feasible effective approach to improve catalytic therapeutic efficacy by an“exogenous CO_(2)delivery”strategy for combinational tumor therapy.

关键词： nanocatalytic therapy manganese silicate carbon dioxide(CO_(2)) Ca^(2+)overload pH modulation

Single-wavelength Excited Ratiometric Fluorescence pH Probe to Image Intracellular Trafficking of Tobacco Mosaic Virus

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Chinese Journal of Polymer Science 2020年第6期38卷 587-592页

作者： Si-Jia Gao Zhuang Li Zhi-Cheng Sun Jin-yue Wen fu-Rong Li Xiao-Yang Du Yan Liu Ye tian Zhong-Wei Niu Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Engineering Research Centerof Printed Electronics Beijing Institute of Graphic CommunicationBeijing 102600China School of future Technology University of Chinese Academy of SciencesBeijing 100049China

As a typical plant virus which has biocompatibility and high transfection efficiency,tobacco mosaic virus(TMV)has shown broad application potential in drug or gene delivery *** its intracellular trafficking is of great importance in investigation of its cytotoxicity,targeting site,and delivery efficiency,and is advantageous to designing new TMV-based drug delivery systems with different *** taking advantage of the regulated pH value of different organelles in a mammalian cell,we exploit a pH detection strategy to investigate the intracellular trafficking pathway of ***,we report a single-wavelength excited ratiometric fluorescent pH *** probe is constructed by simultaneously coupling pH-sensitive fluorescein isothiocyanate(FITC)and pH-insensitive rhodamine B isothiocyanate(RBIRC)onto the inner surface of *** fluorescence intensity ratio of FITC to RBITC excited at 488 nm responds specifically towards pH value over other interferential *** taking use of this single-wavelength excited ratiometric pH probe and confocal laser scanning microscopy,it is shown that the endocytosed TMV is located in a pH decreasing microenvironment and eventually enters *** work may provide important guidance on construction of TMV-based nano carriers.

关键词： Tobacco mosaic virus Ratiometric fluorescence pH probe Intracellular trafficking

Point Cloud Classification Using Content-Based Transformer via Clustering in Feature Space

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 231-239页

作者： Yahui Liu Bin tian Yisheng Lv Lingxi Li Fei-yue Wang the State Key Laboratory for Management and Control of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190 the School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100190 IEEE the Transportation and Autonomous Systems Institute(TASI)and the Department of Electrical and Computer Engineering Purdue School of Engineering and TechnologyIndiana University-Purdue University Indianapolis(IUPUI)Indianapolis 46202 USA

Recently, there have been some attempts of Transformer in 3D point cloud classification. In order to reduce computations, most existing methods focus on local spatial attention,but ignore their content and fail to establish relationships between distant but relevant points. To overcome the limitation of local spatial attention, we propose a point content-based Transformer architecture, called PointConT for short. It exploits the locality of points in the feature space(content-based), which clusters the sampled points with similar features into the same class and computes the self-attention within each class, thus enabling an effective trade-off between capturing long-range dependencies and computational complexity. We further introduce an inception feature aggregator for point cloud classification, which uses parallel structures to aggregate high-frequency and low-frequency information in each branch separately. Extensive experiments show that our PointConT model achieves a remarkable performance on point cloud shape classification. Especially, our method exhibits 90.3% Top-1 accuracy on the hardest setting of ScanObjectN N. Source code of this paper is available at https://***/yahuiliu99/PointC onT.

关键词： Content-based Transformer deep learning feature aggregator local attention point cloud classification

Recent progress on multifunctional electromagnetic interference shielding polymer composites

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Journal of Materials Science & Technology 2023年第3期134卷 106-131页

作者： Ke tian Danrong Hu Quan Wei Qiang fu Hua Deng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Rehabilitation Medicine Center and Institute of Rehabilitation Medicine Key Laboratory of Rehabilitation Medicine in Sichuan ProvinceWest China HospitalSichuan UniversityChengdu 610041China

The explosive development of electronic devices and wireless communication technology gives rise to the issue of electromagnetic pollution,known as electromagnetic interference(EMI).The accumulation of undesirable electromagnetic radiation in space disturbs the normal function of unshielded electronic appliances and poses seriously threat to human ***,the development of EMI shielding materials have emerged to solve the grim *** the complex application contexts,EMI shielding materials have evolved from traditional single-function to multi-functions to meet the ever-increasing application requirements in recent few *** paper provides detailed insight into the current re-search status and future challenges in the advancement of polymer-based EMI shielding materials with various ***,the basic theory of EMI shielding,factors influencing results and the dominating characterization technologies for EMI shielding properties are ***,the comprehensive descriptions of the seven types of multifunctional EMI shields are provided with respect to their structures,fabrication methods and specific ***,the corresponding critical scientific and technical issues are *** on our comprehensive analysis,the main challenges in the development of multifunctional EMI shielding materials are *** review aims to provide some guidance and inspire more efforts toward functional EMI shielding material research to satisfy the growing requirements for next-generation electronic systems.

关键词： Polymer-based composites Electromagnetic interference shielding Multiple losses Multifunctionality