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China Communications 2024年第10期21卷 181-199页

作者： Zhang qiuyang Wang Ying Wang xue School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Networking and Switching Technology(Beijing University of Posts and Telecommunications) Beijing 100876China

With the proportion of intelligent services in the industrial internet of things(IIoT)rising rapidly,its data dependency and decomposability increase the difficulty of scheduling computing *** this paper,we propose an intelligent service computing *** the framework,we take the long-term rewards of its important participants,edge service providers,as the optimization goal,which is related to service delay and computing *** the different update frequencies of data deployment and service offloading,double-timescale reinforcement learning is utilized in the *** the small-scale strategy,the frequent concurrency of services and the difference in service time lead to the fuzzy relationship between reward and *** solve the fuzzy reward problem,a reward mapping-based reinforcement learning(RMRL)algorithm is proposed,which enables the agent to learn the relationship between reward and action more *** large time scale strategy adopts the improved Monte Carlo tree search(MCTS)algorithm to improve the learning *** simulation results show that the strategy is superior to popular reinforcement learning algorithms such as double q-learning(DDqN)and dueling q-learning(dueling-DqN)in learning speed,and the reward is also increased by 14%.

关键词： computing service edge intelligence industrial internet of things(IIoT) reinforcement learning(RL)

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低频低压切负荷的控制负效应及其机理

电力系统自动化 2009年第10期33卷 1-5,53页

作者：任先成薛禹胜 q.H. WU 丁明东南大学电气工程学院江苏省南京市210096 国网电力科学研究院/南京南瑞集团公司江苏省南京市210003 The University of Liverpool Liverpool L69 3GJ UK 合肥工业大学光伏系统教育部工程研究中心安徽省合肥市230009

在有关文献研究功角稳定控制负效应的基础上,分别发现切负荷对暂态频率及电压安全的控制负效应现象。利用扩展等面积准则及暂态频率和电压安全量化理论揭示其机理,探索电力系统稳定问题的复杂性,提高了切负荷控制优化的强壮性。给出一... 详细信息

在有关文献研究功角稳定控制负效应的基础上,分别发现切负荷对暂态频率及电压安全的控制负效应现象。利用扩展等面积准则及暂态频率和电压安全量化理论揭示其机理,探索电力系统稳定问题的复杂性,提高了切负荷控制优化的强壮性。给出一个简单的3机9节点算例可用于重现该现象,并通过大系统中的仿真实例说明问题的现实性。

关键词：低频切负荷低压切负荷控制的负效应校正控制

On Counting Certain Abelian Varieties Over Finite Fields

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Acta Mathematica Sinica,English Series 2021年第1期37卷 205-228页

作者： Jiang Wei xue Chia Fu YU Collaborative Innovation Center of Mathematics School of Mathematics and StatisticsWuhan UniversityWuhan 430072P.R.China Institute of Mathematics Academia Sinica and NCTS6th FloorAstronomy Mathematics BuildingNo.1Roosevelt Rd.Sec.4Taipei 10617TaiwanChina

This paper contains two parts toward studying abelian varieties from the classification point of *** a series of papers[***.,21,1607–1643(2016)],[Taiwan Residents ***.,20(4),723–741(2016)],etc.,the current authors and *** obtain explicit formulas for the numbers of superspecial abelian surfaces over finite *** this paper,we give an explicit formula for the size of the isogeny class of simple abelian surfaces with real Weil number q1/*** establishes a key step that extends our previous explicit calculation of superspecial abelian surfaces to those of supersingular abelian *** second part is to introduce the notion of genera and idealcomplexes of abelian varieties with additional structures in a general *** purpose is to generalize the previous work by the second named author[Forum Math.,22(3),565–582(2010)]on abelian varieties with additional structures to similitude classes,which establishes more results on the connection between geometrically defined and arithmetically defined masses for further investigations.

关键词： Mass formula abelian varieties over finite fields

Effect of tempering on bonding characteristics of cross wedge rolling 42CrMo/q235 laminated shafts

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Journal of Iron and Steel Research International 2020年第10期27卷 1170-1178页

作者： Shuai Zhu Wen-fei Peng xue-dao Shu Zhejiang Provincial Key Laboratory of Part Rolling Technology Ningbo UniversityNingbo 315211ZhejiangChina

To further improve the comprehensive properties of 42CrMo/q235 laminated shafts produced by cross wedge *** treatment of the shafts was *** and bending tests were carried out to compare the changes in mechanicalproperties before and after heat *** results showed that the interfacial bonding strength increased most aftertempering at 350℃for 45 *** microstructure of the interface was observed using a digital *** resultsshowed that the dispersed oxides on the interface were basically eliminated by using the scheme of tempering at 350 cand holding for 45 *** reasons for the change in mechanical properties were explained from the point of theinterfacial *** electron microscopy was used to analyze the micro-morphology of the tensile *** was observed that after tempering at 350℃and holding for 45 min,the dimple holes became larger and deeper,and thestructure of fracture became more uniform and *** the point of the tensile fracture *** reasons for thechange in mcchanical propcrties wcrc explained as well.

关键词： Heat treatment Cross wedge rolling Interface Microstructure Fracture morphology

Class numbers of cyclic 2-extensions and gross conjecture over q

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Science China Mathematics 2010年第9期53卷 2447-2462页

作者： Ouyang Yi xue Hang Univ Sci & Technol China Dept Math Hefei 230026 Peoples R China

The gross conjecture over q was first claimed by Aoki in ***,the original proof contains too many mistakes and false claims to be considered as a serious *** paper is an attempt to find a sound proof of the gross conjecture under the outline of *** reduce the conjecture to an elementary conjecture concerning the class numbers of cyclic 2-extensions of q.

关键词： gross conjecture class number cyclic 2-extension

N,S-codoped porous carbon nanosheets decorated with Fe_(3)C nanoparticles as high-performance anode materials for lithium ion hybrid supercapacitors

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Rare Metals 2022年第7期41卷 2517-2526页

作者： Lin gao Lu-Lu Zhang xue-Lin Yang College of Electrical Engineering&New Energy Hubei Collaborative Innovation Center for Microgrid of New EnergyThree Gorges UniversityYichang 443002China

The practical applications of carbon anode for lithium-ion batteries(LIBs)are largely obstructed by their moderate rate capability and cyclic ***,we report a N,S-codoped porous carbon nanosheet(NSC)decorated with Fe_(3)C nanoparticles(Fe_(3)C/NSC)by a one-pot pyrolysis *** high surface area and abundant defects of NSC can not only promote electrons and ions transfer,but also induce high pseudocapacitive *** importantly,the synergistic catalysis effect of Fe-Nx and Fe_(3)C can catalyze the reversible conversion of some solid electrolyte interface(SEI)components to offer excess capacity during *** expected,the Fe_(3)C-NSC anode delivers a discharge capacity of750 mAh·g^(-1)under a current density of 0.5 A·g^(-1)through 500 cycles and retains a dis-charge capacity of 366 mAh·g^(-1)at 4 A·g^(-1)after 1600 cycles,*** importantly,the lithium-ion capacitors based on Fe_(3)C/NSC anode demonstrate a high energy density of 249.5 Wh·kg^(-1)at 560 W·kg^(-1).

关键词： Fe_(3)C/NSC Lithium-ion batteries Pseudocapacitive behavior Lithium-ion capacitors

Approximating Nash Equilibrium in Day-ahead Electricity Market Bidding with Multi-agent Deep Reinforcement Learning

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 534-544页

作者： Yan Du Fangxing Li Helia Zandi Yaosuo xue University of Tennessee KnoxvilleUSA Oak Ridge National Laboratory Oak RidgeUSA

In this paper,a day-ahead electricity market bidding problem with multiple strategic generation company(gEN-CO)bidders is *** problem is formulated as a Markov game model,where gENCO bidders interact with each other to develop their optimal day-ahead bidding *** unobservable information in the problem,a model-free and data-driven approach,known as multi-agent deep deterministic policy gradient(MADDPg),is applied for approximating the Nash equilibrium(NE)in the above Markov *** MAD-DPg algorithm has the advantage of generalization due to the automatic feature extraction ability of the deep neural *** algorithm is tested on an IEEE 30-bus system with three competitive gENCO bidders in both an uncongested case and a congested *** with a truthful bidding strategy and state-of-the-art deep reinforcement learning methods including deep q network and deep deterministic policy gradient(DDPg)demonstrate that the applied MADDPg algorithm can find a superior bidding strategy for all the market participants with increased profit *** addition,the comparison with a conventional-model-based method shows that the MADDPg algorithm has higher computational efficiency,which is feasible for real-world applications.

关键词： Bidding strategy day-ahead electricity market deep reinforcement learning Markov game multi-agent deterministic policy gradient(MADDPg) Nash equilibrium(NE)

Implementing 1 → M Economical Phase-Covariant Telecloning in Cavity qED

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Communications in Theoretical Physics 2011年第3期55卷 441-444页

作者： xue Li JIANg Nian-quan College of Physics and Electric Information Wenzhou University Wenzhou 325035 China

We propose an experimentally feasible scheme to implement the economical 1 → M phase-covariant telecloning based on cavity qED. By the resonant interaction of the atoms with cavity field of a high-q cavity and the different coupling strength between atoms and cavity field, the scheme can generate quantum entanglement channel in one step. What is more, the operation time and steps do not increase with the increase of atoms.

关键词： cavity qED phase-covariant telecloning

Variation characteristics of atmospheric methane and carbon dioxide in summertime at a coastal site in the South China Sea

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Frontiers of Environmental Science & Engineering 2022年第11期16卷 165-175页

作者： Yangyan Cheng Ye Shan Yuhuan xue Yujiao Zhu Xinfeng Wang Likun xue Yanguang Liu Fangli qiao Min Zhang Key Laboratory of Marine Sciences and Numerical Modeling First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Environment Research Institute Shandong UniversityQingdao 266237China Key Laboratory of Marine geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Shandong Key Laboratory of Marine Sciences and Numerical Modeling Qingdao 266061China

Methane(CH_(4))and carbon dioxide(CO_(2))are the two most important greenhouse gases(gHgs).To examine the variation characteristics of CH_(4)and CO_(2)in the coastal South China Sea,atmospheric CH_(4)and CO_(2)measurements were performed in Bohe(BH),guangdong,China,in summer *** using an adaptive data analysis method,the diurnal patterns of CH_(4)and CO_(2)were clearly extracted and analysed in relation to the sea breeze(SB)and land breeze(LB),*** average concentrations of CH_(4)and CO_(2)were 1876.91±31.13 ppb and 407.99±4.24 ppm during SB,and 1988.12±109.92 ppb and 421.54±14.89 ppm during LB,*** values of CH_(4)and CO_(2)during SB basically coincided with the values and trends of marine background sites,showing that the BH station could serve as an ideal site for background gHg monitoring and dynamic *** extracted diurnal variations in CH_(4)and CO_(2)showed sunrise high and sunset low patterns(with peaks at 5:00–7:00)during LB but mid-morning high and evening low patterns(with peaks at 9:00)during *** diurnal amplitude changes in both CH_(4)and CO_(2)during LB were almost two to three times those during *** direction significantly modulated the diurnal variations in CH_(4)and CO_(2).The results in this study provide a new way to examine the variations in gHgs on different timescales and can also help us gain a better understanding of gHg sources and distributions in the South China Sea.

关键词： Methane Carbon dioxide Diurnal pattern Ensemble empirical mode decomposition South China Sea Sea breeze

Affine-periodic solutions by averaging methods

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Science China Mathematics 2018年第3期61卷 439-452页

作者： Jiamin Xing xue Yang Yong Li College of Mathematics Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University School of Mathematics and Statistics Northeast Normal University Center for Mathematics and Interdisciplinary Sciences Northeast Normal University

This paper concerns the existence of affine-periodic solutions for perturbed affine-periodic *** kind of affine-periodic solutions has the form of x(t+T)≡qx(t) with some nonsingular matrix q,which may be quasi-periodic when q is an orthogonal matrix. It can be even unbounded but x(t)/|x(t)| is quasi-periodic,like a helical line. for example x(t)=e^(at)(cos ωt, sin ωt), when q is not an orthogonal matrix. The averaging method of higher order for finding affine-periodic solutions is given by topological degree.

关键词： affine-periodic solutions averaging method topological degree