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Compact Toeplitz Operators on the Weighted Dirichlet Space

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Acta Mathematica Sinica,English Series 2015年第1期31卷 35-43页

作者： Yu Feng LU yin yin hu Liu LIU School of Mathematical Sciences Dalian University of Technology

In this paper, we completely characterize the compactness of Toeplitz operators with con- tinuous symbol on the weighted Dirichlet space.

关键词： Toeplitz operator Dirichlet space compactness

Commuting Dual Toeplitz Operators on the Harmonic Dirichlet Space

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Acta Mathematica Sinica,English Series 2016年第9期32卷 1099-1105页

作者： Jing Yu YANG yin yin hu Yu Feng LU Tao YU School of Mathematical Statistics Chifeng University Chifeng 024000 P. R. China School of Mathematical Sciences Dalian University of Technology Dalian 116024 P. R. China

In this paper, we characterize the symbols for （semi-）commuting dual Toeplitz operators on the orthogonal complement of the harmonic Dirichlet space. We show that for φ ,ψ ∈ W1, ∞, SφSψ = SψSφ on （Dh）⊥ if and only if φ and ψ satisfy one of the following conditions：（1） Both φ and ψ are harmonic functions; （2） There exist complex constants α and β, not both O, such that φ = αφ＋β.

关键词： Dual Toeplitz operator harmonic Dirichlet space commutativity

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云南省地震高发区雷灾风险分析与区划研究

灾害学 2017年第4期32卷 67-72页

作者：殷娴胡颖周清倩李忠杨宗凯吴永斌云南省气象灾害防御技术中心云南昆明650034 云南省气象局办公室云南昆明650034

根据自然灾害风险分析理论,运用云南省历年地震数据、地闪数据、雷灾数据以及社会经济数据,从地震高发区判别、致灾因子、受灾敏感度、承灾体4个方面提取8个地震高发区雷灾风险指标,采用主成份分析和聚类分析方法,以全省124个县市为对... 详细信息

根据自然灾害风险分析理论,运用云南省历年地震数据、地闪数据、雷灾数据以及社会经济数据,从地震高发区判别、致灾因子、受灾敏感度、承灾体4个方面提取8个地震高发区雷灾风险指标,采用主成份分析和聚类分析方法,以全省124个县市为对象区域构建雷灾风险区划模型,并对区划结果进行验证,具有良好推广运用价值。分析结果表明:全省地震高发区雷灾风险等级可分为7级,极高易损区为腾冲、华坪、昆明。云南中部昆明、玉溪、楚雄一带,南部版纳、普洱一带,西部保山一带,北部丽江一带属于地震活动高发区,同时也是雷电灾害高风险区。

关键词：地震高发区雷电活动雷灾风险主成份分析风险区划

Cerium oxide nanoparticles-mediated cascade catalytic chemo-photo tumor combination therapy

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Nano Research 2022年第1期15卷 333-345页

作者： Zitao hu yin Ding State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China

ROS-based tumor therapy based on nanocatalytic medicine has recently been proposed for its ***,a safe and highly efficient strategy towards getting high enough ROS to kill the hypoxic cancer cells is still a great ***,we report a simple pH/H_()20_(2)-activatable,O_(2)-evolving,and ROS regulating doxorubicin(DOX)and indocyanine green(ICG)co-loading PEGylated polyaniline(PANI)coated CeOx@polyacrylic acid(PAA)nanoclusters for highly selective and optimized cancer combination *** can selectively and greatly enhance intracellular O_(2) and ROS levels in tumor region,which depends on two-step catalytic properties of nanoceria(Ce^(4+)/Ce^(3+)=3.46,neutral surface charge,mostly localize into the cytoplasm,pH 7.4-6.5,catalase-like catalytic agents convert to Ce^(4+)/Ce^(3+)=0.58,negative surface charge,mostly localize into the lysosomes,pH 5-4,oxidase-like catalytic agents,triggered by near infrared(NIA)laser irradiation).Furthermore,the protective effect of polyethylene glycol(PEG),PANI,and PAA ensure that the nanoceria can only play the role of catalase under the irradiation of NIR light arrived at the tumor ***,loading of nanoceria and ICG onto PANI greatly enhanced photo thermal effect of nanoparticles.(NPs),which is useful for killing cancer cells by relieving hypoxia and promoting cross-membrane drug *** further enhance photodynamic therapy and chemotherapy *** chemo-photo combination therapies fantastically inhibited tumor growth and prevented tumor recurrence in vivo,suggesting a smart nanotheranostic system to achieve more precise and effective therapies in O_(2)-deprived tumor tissue.

关键词： nanocatalytic medicine photodynamic therapy hypoxia cerium oxide@polyaniline combination therapy

Polymer-based smart fibers and textiles for wearable electronics

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Science China Technological Sciences 2025年第1期 85-120页

作者： Sanming hu Li WANG Zaixian YUAN Kun CHEN Wei PENG Hai yin Zhijun SHI Guang YANG School of Biomedical Engineering and Imaging Xianning Medical CollegeHubei University of Science and Technology College of Life Science and Technology Huazhong University of Science and Technology Wuhan Branch of the National Science Library Chinese Academy of Sciences

Smart fibers and textiles have attracted considerable interest for application in wearable devices because of their advantages of being human-friendly, lightweight, flexible, and comfortable. In addition, they are considered to have potential applications in health monitoring, energy management, and human-machine interaction systems. Polymers and polymer fibers,with excellent mechanical strength, wrinkle resistance, and heat resistance, are widely used to fabricate smart fibers and textiles. Herein, a comprehensive overview of polymer-based fibers and textiles is provided. First, we review the design principles of various polymer-based smart textiles, including textile-based sensors, energy capture and storage textiles, and computation and display textiles. Next, materials used for preparing polymer-based smart fibers, such as metals, carbon-based materials, and natural and synthetic polymers, particularly conductive polymers, are summarized. In addition, this review summarizes key technologies used for preparing smart fibers and the conventional structures of smart textiles. Furthermore, the applications of smart textiles in personal health monitoring, thermal management, energy capture and storage, and computation and displays are discussed. Finally, the current challenges, limitations, and future trends of smart fibers and textiles are discussed.

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COMPETITIVE INVESTMENT STRATEGIES IN NEW TECHNOLOGY ADOPTION WITH A FURTHER NEW TECHNOLOGY ANTICIPATED

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Journal of Systems Science & Complexity 2007年第3期20卷 444-453页

作者： Baojian yin . Shigeng hu Department of Mathematics Huazhong University of Science and Technology Wuhan 430074 China.

This paper studies a general dynamic duopoly in which two firms compete in the adoption of current technology with a further new technology anticipated. Three kinds of equilibria may occur in technology adoption, namely the preemptive, sequential, and simultaneous equilibrium, depending on the level of operating costs and the first-move advantage. It shows that the faster technological innovation encourages the leader to invest earlier, while induces the follower to invest later. Furthermore, like the investment costs, with the increase of the operating costs, the follower tends to invest later, while the leader tends to invest earlier. However, the investment thresholds are more sensitive to the change of the operating costs than that of the investment costs.

关键词： Operating costs preemption real options technological uncertainty.

Quantum Transport and Surface Scattering in Magnetic Metallic Film

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Communications in Theoretical Physics 2008年第9期50卷 771-776页

作者： hu yin DONG Zheng-Chao Department of Physics Huaiyin Teachers College Huaian 223001 China Key Laboratory for Chemistry of Low-Dimensional Materials of Jiangsu Province Huaian 223001 China

Taking into account the quantum size effect and the spin dependence of the electronic band structure,and including the spin dependence of the scattering from bulk impurities and two different sets of surface roughness,wepresent a theory on the electronic transport in magnetic film,in which the average autocorrelation function (ACF) forsurface roughness is described by a Gaussion *** result shows that the conductivity is a sensitive function ofsurface roughness and exchange *** is also found that in the thin film limit and in the lower-order approximationof the surface scattering,the total conductivity is given by a sum of conductivities of all the subbands and the two spinchannels,for each subband and each spin channel the scattering rates due to the impurities and two surfaces are additive.

关键词： magnetic metallic film surface scattering magnetic exchange splitting

Typology and working mechanism of a hybrid power router based on power-frequency transformer electromagnetic coupling with converters

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Protection and Control of Modern Power Systems 2023年第3期8卷 80-96页

作者： Jinmu Lai Xin yin Xianggen yin Jiaxuan hu Fan Xiao School of Electrical and Information Engineering Zhengzhou UniversityZhengzhou 450001Henan ProvincePeople’s Republic of China School of Automation Wuhan University of TechnologyWuhan 430070Hubei ProvincePeople’s Republic of China School of Electrical and Electronic Engineering Huazhong University of Science and Technology(HUST)Wuhan 430074Hubei ProvincePeople’s Republic of China State Grid hubei Electric Power Research Institute Wuhan 430077Hubei ProvincePeople’s Republic of China

The power router(PR)is a promising piece of equipment for realizing multi-voltage level interconnection and flex-ible power control in the future distribution power *** this paper,a hybrid PR(HPR)topology based on power-frequency transformer electromagnetic coupling with converters is proposed for the medium distribution power *** power-frequency transformer is used to undertake power transmission,voltage conversion,and other main tasks,while the power electronic converters are combined to achieve active *** magnetic and electrical circuit models are established to help discuss the operating principle of the proposed ***,the power flow and control principle of the HPR in different operating conditions are analyzed,with the control system design scheme *** theoretical analysis results are verified by MATLAB/Simulink+Plecs simulation and a controller hardware-in-the-loop study,as well as a down-scale experimental test,indicating that the proposed HPR is flexible in active voltage support and current control.

关键词： Power router Power-frequency transformer Power electronic converter Hybrid Working mechanism

Seasonal differences in sources and formation processes of PM2.5 nitrate in an urban environment of North China

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Journal of Environmental Sciences 2022年第10期34卷 94-104页

作者： Yanli Li Yaping Geng Xiaomian hu Xijie yin Institute of Resources and Environment Henan Polytechnic UniversityJiaozuo 454000China Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361000China

Nitrate(NO_(3)^(−))has been the dominant ion of secondary inorganic aerosols(SIAs)in PM_(2.5) in North *** the formation mechanisms and sources of particulate nitrate are vital to mitigate air *** this study,PM_(2.5) samples in winter(January 2020)and in summer(June 2020)were collected in Jiaozuo,China,andwater-soluble ions and(δ_(15)N,δ_(18)O)-NO_(3)^(−)were *** results showed that the increase of NO_(3)^(−)concentrations was the most remarkable with increasing PM_(2.5) pollution level.δ_(18)O-NO_(3)^(−)values for winter samples(82.7‰ to 103.9‰)were close to calculated δ_(18)O-HNO_(3)(103‰±0.8‰)values by N_(2)O_(5) pathway,while δ_(18)O-NO_(3)^(−)values(67.8‰ to 85.7‰)for summer samples were close to calculated δ_(18)O-HNO_(3) values(61‰±0.8‰)by OH oxidation pathway,suggesting that PM_(2.5) nitrate is largely from N_(2)O_(5) pathway inwinter,while is largely from OH pathway in *** fractional contributions of P_(N2O5+H2O) were 70% and 39% in winter and summer sampling periods,respectively,those of POH were 30% and 61%,*** δ_(15)N-NO_(3)−values for winter samples(3.0‰to 14.4‰)than those for summer samples(-3.7‰to 8.6‰)might be due to more contributions from coal combustion in *** combustion(31%±9%,25%±9%in winter and summer,respectively)and biomass burning(30%±12%,36%±12%in winter and summer,respectively)were the main sources using Bayesian mixing *** results provided clear evidence of particulate nitrate formation and sources under different PM_(2.5) levels,and aided in reducing atmospheric nitrate in urban environments.

关键词： PM_(2.5) Dual isotopes Nitrate formation pathways Bayesian mixing model