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Co/Co_(7)Fe_(3)heterostructures with controllable alloying degree on carbon spheres as bifunctional electrocatalyst forrechargeable zinc-air batteries

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 476-487页

作者： Junkang chen Yongyue Zhuang Yanxin Qiao Yu Zhang Aihua Yuan Hu Zhou School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Exploring efficient and nonprecious metal electrocatalysts of oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is crucial for developing rechargeable zinc-air batteries(ZABs).Herein,an alloying-degree control strategy was employed to fabricate nitrogen-doped carbon sphere(NCS)decorated with dual-phase Co/Co_(7)Fe_(3)heterojunctions(CoFe@NCS).The phase composition of materials has been adjusted by controlling the alloying *** optimal CoFe_(0.08)@NCS electrocatalyst displays a half-wave potential of 0.80 V for ORR and an overpotential of 283 mV at 10 mA·cm^(-2)for OER in an alkaline *** intriguing bifunctional electrocatalytic activity and durability is attributed to the hierarchically porous structure and interfacial electron coupling of highly-active Co_(7)Fe_(3)alloy and metallic Co *** the CoFe_(0.08)@NCS material is used as air-cathode catalyst of rechargeable liquid-state zinc-air battery(ZAB),the device shows a high peak power-density(157 mW·cm^(-2))and maintains a stable voltage gap over 150 h,outperforming those of the benchmark(Pt/C+RuO_(2))-based *** particular,the as-fabricated solid-state flexible ZAB delivers a reliable compatibility under different bending *** work provides a promising strategy to develop metal/alloy-based electrocatalysts for the application in renewable energy conversion technologies.

关键词： bifunctional electrocatalysts oxygen reduction reaction oxygen evolution reaction zinc-air battery metal/alloy carbon sphere

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Multi-path routing based on load-balance for cognitive packet networks

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 71-75页

作者： chen liang JI hong LI Yi LI Xi College of Information and Commumieation Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

Quality of service （QoS） routing algorithms have been hardly discussed in the scientific community, most previous work on QoS routing concentrates on the performance of the single route. Cognitive packet network （CPN） has been designed for providing QoS routing. In this paper, to balance the loads among networks, we present a multi-path routing algorithm based on load-balance （MPRLB）, which is carried out in two steps. The algorithm with low computational complexity is firstly applied to establish multi path routing for each source and destination node pairs （SD-pair） nodes in the network. Then, we propose the hopfield neural network algorithm, which is applied to improve the efficiency of the flow deviation method for fast flow allocation among the links of the network based on load balance. Extensive simulation results demonstrate that the proposed scheme significantly improves the performance compared with the existing scheme that ignores load balancing.

关键词： hopfield neural network CPN multi-path routing

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Binary Population Synthesis

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Research in Astronomy and Astrophysics 2020年第10期20卷 207-220页

作者： Zhan-Wen Han hong-Wei Ge Xue-Fei chen Hai-liang chen Yunnan Observatories Chinese Academy of SciencesKunming 650216China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China University of the Chinese Academy of Sciences Beijing 100049China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100101China

Binary interactions lead to the formation of intriguing objects,such as compact binaries,supernovae,gamma ray bursts,X-ray binaries,pulsars,novae,cataclysmic variables,hot subdwarf stars,barium stars and blue *** study the evolution of binary populations and the consequent formation of these objects,many methods have been developed over the years,for which a robust approach named binary population synthesis(BPS)warrants special *** approach has seen widespread application in many areas of astrophysics,including but not limited to analyses of the stellar content of galaxies,research on galactic chemical evolution and studies concerning star formation and cosmic *** this review,we discuss the role of BPS,its general picture and the various components that comprise *** pay special attention to the stability criteria for mass transfer in binaries,as this stability largely determines the fate of binary *** conclude with our perspectives regarding the future of this field.

关键词： stars evolution-star binaries(including multiple) close-stars statistics-supernovae general-galaxies stellar content-methods numerical

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Efficient and Recyclable Cobalt(Ⅱ)/Ionic Liquid Catalytic System for CO2 Conversion to Prepare 2-Oxazolinones at Atmospheric Pressure

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Chinese Journal of Chemistry 2019年第12期37卷 1223-1228页

作者： Zhi-Hua Zhou Kai-hong chen liang-Nian He State Key Laboratory and Institute of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071China

Summary of main observation and conclusion Converting CO2 into value-added chemicals represents a promising way to alleviate the CO2 derived environmental issues,for which the development of catalysts with high efficiency and recyclability is very ***,the catalytic system by combining cobalt source and ionic liquid(IL)has been developed as the efficacious and recyclable catalyst for the carboxylative cyclization of propargylic amine and CO2 to prepare *** this protocol,various propargylic amines were successfully transformed into the corresponding 2-oxazolinones with CoBr2 and diethylimidazolium acetate([EEIM][OAc])as the catalyst under atmospheric CO2 *** is worth noting that the turnover number(TON)of this transformation can be up to 1740,presumably being attributed to the cooperative effect of the cobalt and ***,the existence of IL enables the catalytic system to be easily recycled to 10 times without losing its activity.

关键词： cobalt catalyst Catalytic

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Enhancing cut selection through reinforcement learning

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Science China Mathematics 2024年第6期67卷 1377-1394页

作者： Shengchao Wang liang chen Lingfeng Niu Yu-hong Dai Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing100190China Research Center on Fictitious Economy and Data Science Chinese Academy of SciencesBeijing100190China

With the rapid development of artificial intelligence in recent years,applying various learning techniques to solve mixed-integer linear programming(MILP)problems has emerged as a burgeoning research *** from constructing end-to-end models directly,integrating learning approaches with some modules in the traditional methods for solving MILPs is also a promising *** cutting plane method is one of the fundamental algorithms used in modern MILP solvers,and the selection of appropriate cuts from the candidate cuts subset is crucial for enhancing *** to the reliance on expert knowledge and problem-specific heuristics,classical cut selection methods are not always transferable and often limit the scalability and generalizability of the cutting plane *** provide a more efficient and generalizable strategy,we propose a reinforcement learning(RL)framework to enhance cut selection in the solving process of ***,we design feature vectors to incorporate the inherent properties of MILP and computational information from the solver and represent MILP instances as bipartite ***,we choose the weighted metrics to approximate the proximity of feasible solutions to the convex hull and utilize the learning method to determine the weights assigned to each ***,a graph convolutional neural network is adopted with a self-attention mechanism to predict the value of weighting ***,we transform the cut selection process into a Markov decision process and utilize RL method to train the *** experiments are conducted based on a leading open-source MILP solver *** on both general and specific datasets validate the effectiveness and efficiency of our proposed approach.

关键词： reinforcement learning mixed-integer linear programming cutting plane method cut selection

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肺癌患者化疗前后血小板参数动态变化及黄芪注射液的影响

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实用中西医结合临床 2007年第3期7卷 3-4页

作者：李宏良杨恒陈海生田华琴广州中医药大学附属佛山中医院广东佛山528000 佛山科学技术学院医学院广东佛山528000

目的:探讨血小板参数在肺癌患者化疗前后的变化及黄芪注射液对血小板参数的影响。方法:回顾性分析55例分别采用单纯化疗和化疗加黄芪注射液治疗的肺癌患者,2组患者均采用日本Sysmex XT-1800i型全自动血液分析仪检测化疗前后血小板(PLT)... 详细信息

目的:探讨血小板参数在肺癌患者化疗前后的变化及黄芪注射液对血小板参数的影响。方法:回顾性分析55例分别采用单纯化疗和化疗加黄芪注射液治疗的肺癌患者,2组患者均采用日本Sysmex XT-1800i型全自动血液分析仪检测化疗前后血小板(PLT)、血小板压积(PCT)、平均血小板体积(MPV)、血小板分布宽度(PDW)等血小板参数,观察并比较血小板参数在肺癌患者化疗前后的变化及单纯化疗组与化疗加黄芪注射液组间的差异。以30例健康体检者作对照。结果:肺癌患者PLT、MPV、PCT较正常人高(P0.05)。单纯化疗后肺癌患者PLT、MPV、PCT明显下降,其最低值与化疗前比较有显著差异(P0.05);化疗第21天,PLT、MPV、PCT、PDW值升高,与化疗最低值比较有显著性差异(P0.05)。结论:检测血小板参数对于了解肺癌化疗患者骨髓造血情况有一定意义。应用黄芪注射液能保护骨髓造血功能,防止严重血小板减少症的发生。

关键词：肺癌血小板参数化疗黄芪注射液

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Two-stage evolutionary algorithm for dynamic multicast routing in mesh network

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第6期9卷 791-798页

作者： Li ZHU Zhi-shu LI liang-yin chen Yan-hong chenG School of Computer Science Siehuan University Chengdu 610065 China Network Center Chengdu Sport University Chengdu 610041 China

In order to share multimedia transmissions in mesh networks and optimize the utilization of network resources, this paper presents a Two-stage Evolutionary Algorithm (TEA), i.e., unicast routing evolution and multicast path composition, for dynamic multicast routing. The TEA uses a novel link-duplicate-degree encoding, which can encode a multicast path in the link-duplicate-degree and decode the path as a link vector easily. A dynamic algorithm for adding nodes to or removing nodes from a multicast group and a repairing algorithm are also covered in this paper. As the TEA is based on global evaluation, the quality of the multicast path remains stabilized without degradation when multicast members change over time. Therefore, it is not necessary to rearrange the multicast path during the life cycle of the multicast sessions. Simulation results show that the TEA is efficient and convergent.

关键词： Dynamic multicast Routing Encoding Quality of Service (QoS) Evolution Genetic algorithm (GA)

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Molten salt electrochemical modulation of Ni/Co nanoparticles onto N-doped carbon for oxygen reduction

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Journal of Energy Chemistry 2022年第11期31卷 212-217,I0007页

作者： Xinxin liang Jialin chen Biao hong Tingting Wan Wei Weng Wei Xiao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072HubeiChina Zijin School of Geology and Mining Fujian Key Laboratory of Green Extraction and High-value Utilization of Energy MetalsFuzhou UniversityFuzhou 350108FujianChina Queen Marry University of London Engineering School Northwestern Polytechnical UniversityXi’an 710129ShaanxiChina

Activation of oxygen over non-precious materials has been an imperative task to develop efficient electrochemical energy storage and conversion such as fuel cells and metal-air ***,a molten salt electrochemical modulation of metal-nitrogen-carbon based compounds(M–N–C)is *** electrochemical treatment of polydopamine-coated NiCo_(2)O_(4)(NiCo_(2)O_(4)@PDA)in molten Li_(2)CO_(3)-Na_(2)CO_(3)-K_(2)CO_(3)at 500℃,Ni/Co bimetal-nitrogen-carbon catalyst(denoted as Ni/Co@NC)consisting of Ni-Co nanoparticles anchoring on porous nitrogen-doped carbon is constructed and evaluated as electrocatalysts towards the oxygen reduction reaction(ORR).Experimental and calculation results confirm that alloying of Ni-Co and nitrogen doping to carbon enhances the rate-determining transformation of*OH intermediate during *** Ni/Co@NC hence shows an ORR activity comparable with the commercial Pt/C.

关键词： Oxygen reduction Metal-nitrogen-carbon Electrochemistry Molten salt Bimetal modulation

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Efficient protocols for heavy hitter identification with local differential privacy

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Frontiers of Computer Science 2022年第5期16卷 193-203页

作者： Dan ZHAO Suyun ZHAO hong chen Ruixuan LIU Cuiping LI Wenjuan liang Key Laboratory of Data Engineering and Knowledge Engineering of Ministry of Education Renmin University of ChinaBeijing 100872China School of Information Renmin University of ChinaBeijing 100872China

Local differential privacy(LDP),which is a technique that employs unbiased statistical estimations instead of real data,is usually adopted in data collection,as it can protect every user’s privacy and prevent the leakage of sensitive *** segment pairs method(SPM),multiple-channel method(MCM)and prefix extending method(PEM)are three known LDP protocols for heavy hitter identification as well as the frequency oracle(FO)problem with large ***,the low scalability of these three LDP algorithms often limits their ***,communication and computation strongly affect their ***,excessive grouping or sharing of privacy budgets makes the results *** address the abovementioned problems,this study proposes independent channel(IC)and mixed independent channel(MIC),which are efficient LDP protocols for FO with a large *** design a flexible method for splitting a large domain to reduce the number of ***,we employ the false positive rate with interaction to obtain an accurate *** experiments demonstrate that IC outperforms all the existing solutions under the same privacy guarantee while MIC performs well under a small privacy budget with the lowest communication cost.

关键词： local differential privacy frequency oracle heavy hitter

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Boosted photoreduction of diluted CO_(2) through oxygen vacancy engineering in NiO nanoplatelets

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Nano Research 2021年第3期14卷 730-737页

作者： Weiyi chen Xueming Liu Bin Han Shujie liang hong Deng Zhang Lin School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource RecyclingSouth China University of TechnologyGuangzhou510006China Guangdong Engineering and Technology Research Center for Environmental Nanomaterials Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education)South China University of TechnologyGuangzhou510006China

Converting carbon dioxide(CO_(2))to diverse value-added products through photocatalysis can validly alleviate the critical issues of greenhouse effect and energy shortages *** particular,based on practical considerations,exploring novel catalysts to achieve efficient photoreduction of diluted CO_(2) is necessary and ***,this process is extremely challenging owing to the disturbance of competitive adsorption at low CO_(2) ***,we delicately synthesize oxygen vacancy-laden NiO nanoplatelets(r-NiO)via calcination under Ar protection to reduce diluted CO_(2) through visible light irradiation(>400 nm)assisted by a Ru-based *** from the strongly CO_(2) adsorption energy of oxygen vacancies,which was confirmed by density functional calculations,the r-NiO catalysts exhibit higher activity and selectivity(6.28×10^(3)µmol·h^(−1)·g^(−1);82.11%)for diluted CO_(2)-to-CO conversion than that of the normal NiO(3.94×10^(3)µmol·h^(−1)·g^(−1);65.26%).Besides,the presence of oxygen vacancies can also promote the separation of electron-hole *** research demonstrates that oxygen vacancies could act as promising candidates for photocatalytic CO_(2) reduction,offering fundamental guidance for the actual photoreduction of diluted CO_(2) in the future.

关键词： diluted CO_(2) photocatalytic reduction oxygen vacancies NiO nanoplatelets adsorption

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