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Journal of Systems Science & Complexity 2006年第4期19卷 449-460页

作者： Cuimei ZHANG wencheng chen Yu YANG College of Information Science and Engineering Shandong University of Science and Technology Taian 271019 Department of Mathematics and Physics Anhui University of Science and Tehnology Huainan 232001 China. College of Information Science and Engineering Shandong Agricultural University Taian 271018 China. College of Information Science and Engineering Shandong University of Science and Technology Taian 271019 China.

In this paper, we study the existence and global asymptotic stability of positive periodic solutions of a delayed periodic predator-prey system with Hoffing Ⅱ type functional response. By use of the continuation theo... 详细信息

关键词： Coincidence degree discrete predator-prey system global asymptotic stability positive periodic solutions.

Data Secure Storage Mechanism of Sensor Networks Based on Blockchain

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Computers, Materials & Continua 2020年第12期65卷 2365-2384页

作者： Jin Wang wencheng chen Lei Wang R.Simon Sherratt Osama Alfarraj Amr Tolba School of Information Science and Engineering Fujian University of TechnologyFuzhou350118China School of Computer&Communication Engineering Changsha University of Science&TechnologyChangsha410004China School of Civil Engineering Changsha University of Science&TechnologyChangsha410000China Department Biomedical Engineering University of ReadingReadingRG66AYUK Computer Science Department Community CollegeKing Saud UniversityRiyadh11437Saudi Arabia Mathematics and Computer Science Department Faculty of ScienceMenoufia UniversityShebin-El-Kom32511Egypt

As the number of sensor network application scenarios continues to grow,the security problems inherent in this approach have become obstacles that hinder its wide ***,it has attracted increasing attention from industry and *** blockchain is based on a distributed network and has the characteristics of non-tampering and traceability of block *** is thus naturally able to solve the security problems of the sensor ***,this paper first analyzes the security risks associated with data storage in the sensor networks,then proposes using blockchain technology to ensure that data storage in the sensor networks is *** the traditional blockchain,the data layer uses a Merkle hash tree to store data;however,the Merkle hash tree cannot provide non-member proof,which makes it unable to resist the attacks of malicious nodes in *** solve this problem,this paper utilizes a cryptographic accumulator rather than a Merkle hash tree to provide both member proof and non-member ***,the number of elements in the existing accumulator is limited and unable to meet the blockchain’s expansion *** paper therefore proposes a new type of unbounded accumulator and provides its definition and security ***,this paper constructs an unbounded accumulator scheme using bilinear pairs and analyzes its performance.

关键词： Sensor networks blockchain unbounded accumulator storage mechanism

Suppressing the Undesirable Energy Loss in Solution-Processed Hyperfluorescent OLEDs Employing BODIPY-Based Hybridized Local and Charge-Transfer Emitter

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Energy & Environmental Materials 2024年第2期7卷 372-380页

作者： Xuewei Nie Zafar Mahmood Denghui Liu Mengke Li Dehua Hu wencheng chen Longjiang Xing Shijian Su Yanping Huo Shaomin Ji School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of TechnologyGuangzhou 510640China

Hyperfluorescent organic light-emitting diodes(HF-OLEDs)approach has made it possible to achieve excellent device performance and color purity with low roll-off using noble-metal-free pure organic *** significant progress,the performance of HF-OLEDs is still unsatisfactory due to the existence of a competitive dexter energy transfer(DET)*** this contribution,two boron dipyrromethene(BODIPY)-based donor-acceptor emitters(BDP-C-Cz and BDP-N-Cz)with hybridized local and charge transfer characteristics(HLCT)are introduced in the HF-OLED to suppress the exciton loss by dexter mechanism,and a breakthrough performance with low-efficiency roll-off(0.3%)even at high brightness(1000 cd m^(-2))is *** is demonstrated that the energy loss via the DET channel can be suppressed in HF-OLEDs utilizing the HLCT emitter,as the excitons from the dark triplet state of such emitters are funneled to its emissive singlet state following the hot-exciton *** developed HF-OLED device has realized a good maximum external quantum efficiency(EQE)of 19.25%at brightness of 1000 cd m^(-2)and maximum luminance over 60000 cd m^(-2),with an emission peak at 602 nm and Commission International de L'Eclairage(CIE)coordinates(0.57,0.41),which is among the best-achieved results in solution-processed *** work presents a viable methodology to suppress energy loss and achieve high performance in the HF-OLEDs.

关键词： BODIPY hyperfluorescence organic light-emitting diodes solution-process

Application of Improved Matter-element Extension Method in Comprehensive Assessment of Shallow Groundwater

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Journal of Landscape Research 2016年第4期8卷 16-20,26页

作者： HUANG Yaoyi SU Jianyun chen wencheng College of Resources and Environment Science Quanzhou Normal University

Taking shallow groundwater in Jinjiang City,Fujian Province for example,it was found that the classical element-matter analysis shows deficiency in calculation of correlation function,so the improved matter-element method was applied for the comprehensive assessment of shallow groundwater in Jinjiang City,and the spatial distribution was shown in *** assessment results demonstrated that ground water quality of most regions in the study area belonged to Grade I and II,thus the overall quality of shallow groundwater was *** groundwater of Grade IV and V(relatively poor and extremely poor) was mainly distributed in Dongshi Town,chendi Town,Zimao Town,and Shenhu Town,major exceeding-standard factors that influence shallow groundwater quality in the local area included TDS,Mn^(2+),NO_3,NO_2,NH_4^+ and Cl^-,which mainly owed to invasion of seawater,original geological conditions,industrial and agricultural discharge,and human life.

关键词： Improved matter-element analysis Correlation degree Shallow groundwater Comprehensive assessment

金融控股公司与附属金融机构交叉持股问题研究

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上海金融 2010年第4期 57-60页

作者：陈文成武汉大学法学院

我国《公司法》对公司交叉持股没有明确的规定。现实中,金融控股公司与附属金融机构之间存在复杂的交叉持股关系,利弊皆有。本文对金融控股公司中母子公司之间、子公司之间和非母子公司之间交叉持股进行分析,并提出相应的立法规制建议。

关键词：金融控股公司母公司子公司交叉持股

金融控股公司对附属金融机构责任加重制度研究

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上海金融 2009年第8期 24-26页

作者：陈文成中国人民银行上海总部

金融控股公司对附属金融机构加重责任制度是指金融控股公司的金融子公司未达到金融监管机构规定的资本充足率、财务状况恶化或破产倒闭时,控股公司必须实施金融援助,协助其恢复正常营运。本文从我国金融控股公司的发展情况和监管现状出... 详细信息

金融控股公司对附属金融机构加重责任制度是指金融控股公司的金融子公司未达到金融监管机构规定的资本充足率、财务状况恶化或破产倒闭时,控股公司必须实施金融援助,协助其恢复正常营运。本文从我国金融控股公司的发展情况和监管现状出发,借鉴国际立法经验,探讨加重责任制度对我国相关立法的启示。

关键词：金融控股公司责任加重

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流的Ω-极限集

数学学报（中文版） 1999年第3期42卷 559-562页

作者：陈文成山东矿业学院应用数学与软件工程系

本文讨论流的Ω－极限集的性质，推广了ＣｏｎｌｅｙＣ。在文［１］中的一些结果。

关键词：流延伸极限集 ω-极限集 Ω-极限集吸引区域

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带炉水循环泵直流炉启动阶段给水流量控制

热力发电 2014年第2期43卷 100-103页

作者：陈文成江苏阚山发电有限公司江苏徐州221134

介绍了江苏阚山发电有限公司超超临界2×600MW机组带炉水循环泵直流锅炉启动系统的组成、机组启动期间的给水流量控制,及启动期间由湿态向干态转换过程的特点和注意事项。该机组对启动初期和转直流运行阶段的给水流量进行严格控制,在启... 详细信息

介绍了江苏阚山发电有限公司超超临界2×600MW机组带炉水循环泵直流锅炉启动系统的组成、机组启动期间的给水流量控制,及启动期间由湿态向干态转换过程的特点和注意事项。该机组对启动初期和转直流运行阶段的给水流量进行严格控制,在启动过程中即回收了工质,又回收了热量,同时还降低了给水泵的运行功率,为同类机组安全运行提供了参考。

关键词：超超临界 600 MW机组直流炉炉水循环泵启动系统循环水流量控制

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两个Abel积分的比值单调性的判别条件

系统科学与数学 2007年第4期27卷 608-614页

作者：鞠晶陈文成鲁东大学数学与信息学院烟台264025 山东农业大学数学与信息学院泰安271018

用直接计算的方法对文献中给出的第三类函数的一种特殊形式给出其积分比值单调性的判别条件.

关键词：积分比值单调性.

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基于空间句法的泉州城区道路网形态研究

热带地理 2011年第6期31卷 604-608,615页

作者：陈垚森陈文成中山大学地理科学与规划学院广州510275 泉州师范学院资源与环境科学学院福建泉州362000

根据空间句法理论对泉州城区道路网进行量化描述,并利用量化后的泉州城区道路网的形态变量对其空间特征形态进行研究分析。结果表明,泉州中心城区总体呈格网状特征,空间智能性较高,道路网形态较合理,同时也存在智能值与集成度均与交通... 详细信息

根据空间句法理论对泉州城区道路网进行量化描述,并利用量化后的泉州城区道路网的形态变量对其空间特征形态进行研究分析。结果表明,泉州中心城区总体呈格网状特征,空间智能性较高,道路网形态较合理,同时也存在智能值与集成度均与交通实际不符的道路空间。最后在此形态基础上提出泉州道路网的优化建议,为城市的空间扩展、规划建设提供参考依据。

关键词：空间句法泉州城区道路网形态研究