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柔性环连网多重非线性DEM分析法

计算力学学报 2025年第01期42卷 122-129页

作者：余志祥刘键田永丁西南交通大学土木工程学院中铁二院工程集团有限责任公司

针对防落石柔性网系统的多体动力学计算难题，提出了一种用于环连网多重非线性分析的离散元分析方法。开展了12组单环准静态拉伸试验，获得了网环拉伸受力全过程的力-位移曲线，明确了多种钢丝缠绕圈数条件下钢丝环的拉弯临界荷载、破... 详细信息

针对防落石柔性网系统的多体动力学计算难题，提出了一种用于环连网多重非线性分析的离散元分析方法。开展了12组单环准静态拉伸试验，获得了网环拉伸受力全过程的力-位移曲线，明确了多种钢丝缠绕圈数条件下钢丝环的拉弯临界荷载、破断力、破断变形及破断能量。据此，确定了离散元模型的等效物理参数，并考虑了钢丝环套接区域的压扁软化和拉弯复合受力特性，标定了网环单元离散元模型的Bond键拉弯刚度控制参数，解决了环网单元的弯-拉协调等效难题。建立了密集套结的环连网离散元模型，并开展了环连网顶破全过程的数值模拟，结合环连网部件试验结果进行了比较分析。研究表明，环连网离散元分析方法准确模拟了钢丝环单元的弯-拉大变形受力特征及接触区域拉、弯、压复合受力破断模式；同时再现了环连网部件顶破全过程的接触滑动、塑性变形及冲切破坏等关键物理现象；离散元模型的破断力峰值、破断变形、拉伸刚度、弯曲刚度等关键结果均与试验吻合，验证了方法的合理性与可靠性。研究成果为柔性防护工程多重非线性精确量化分析提供了新途径。

关键词：防护工程环连网离散元方法拉伸试验数值模拟

A Dairy Industry Information Cooperative Service System Based on a Production Process Ontology

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Journal of Integrative Agriculture 2012年第5期11卷 839-848页

作者： XU Yong niu Fang-qu Luke Bergmann WANG zhi-qiang WANG jian Key Laboratory of Regional Sustainable Development Modeling Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 P.R.China Department of Geography University of Minnesota Minneapolis MN 55455 United States of America Institute of Agricultural Information Chinese Academy of Agricultural Sciences Beijing 100081 P.R. China

Agricultural information cooperative services （AICS） are now becoming an important aspect of agriculture informatization. This study offers an ontological conception of the agricultural production process, establishing operational divisions corresponding to both the stages and the fundamental information requirements of the dairy industry production process in China, yielding a process ontology for the dairy industry as well as a business chain model. A framework for a dairy industry information cooperative service system was established, with service functions realized in a prototype system. The resulting agricultural process ontology built on the basis of biological characteristics has advantages as a classification standard for agricultural information; whereas the business chain model based on this agricultural process ontology allows for an effective distribution of agricultural information cooperative services. This study outlines a concept and demonstrates a prototype of a cooperative service capable of integrating diverse online agricultural information relevant to the dairy industry in China.

关键词： agricultural information ontology dairy industry cooperative service agricultural informatization

Molecular simulation study of the microstructures and properties of pyridinium ionic liquid[HPy][BF_(4)]mixed with acetonitrile

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原子与分子物理学报 2025年第4期42卷 27-32页

作者： XU jian-Qiang MA Zhao-Peng CHENG Si LIU zhi-Cong ZHU Guang-Lai Department of Physics School of Physics and Electronic InformationAnhui Normal UniversityWuhu 241002China

The microstructures and thermodynamic properties of mixed systems comprising pyridinium ionic liquid[HPy][BF_(4)]and acetonitrile at different mole fractions were studied using molecular dynamics simulation in this *** following properties were determined:density,self-diffusion coefficient,excess molar volume,and radial distribution *** results show that with an increase in the mole fraction of[HPy][BF_(4)],the self-diffusion coefficient ***,the excess molar volume initially decreases,reaches a minimum,and then *** rules of radial distribution functions(RDFs)of characteristic atoms are *** increasing the mole fraction of[HPy][BF_(4)],the first peak of the RDFs of HA1-F decreases,while that of CT6-CT6 rises at first and then *** indicates that the solvent molecules affect the polar and non-polar regions of[HPy][BF_(4)]differently.

关键词： Pyridinium ionic liquids Thermodynamic properties Molecular dynamics simulation Radial distribution functions

Models to predict sunlight-induced photodegradation rates of contaminants in wastewater stabilisation ponds and clarifiers

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Water Science and Engineering 2019年第4期12卷 293-297页

作者： Xi-zhi niu Department of Chemical and Environmental Engineering and Arizona Laboratory for Emerging Contaminants University of Arizona

Two kinetic models were established for conservative estimates of photodegradation rates of contaminants under sunlight irradiation,in particular for wastewater stabilisation ponds and clarifiers in conventional wastewater treatment *** two models were designated for(1)contaminants with high photolytic rates or high photolytic quantum yields,whose photodegradation is unlikely to be enhanced by aquatic photosensitisers;and(2)contaminants withstanding direct photolysis in sunlit waters but subjected to indirect *** effortlessly intelligible prediction procedure involves sampling and analysis of real water samples,simulated solar experiments in the laboratory,and transfer of the laboratory results to realise water treatment using the prediction *** similar models have been widely used for laboratory studies,this paper provides a preliminary example of translating laboratory results to the photochemical fate of contaminants in real waters.

关键词： Sunlight irradiation Photodegradation Contaminants Stabilisation ponds Solar water treatment

Green synthesis of luminescent La-MOF nanoparticle from waste poly(ethylene terephthalate) for high-performance in Fe(Ⅲ) detection

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Rare Metals 2024年第8期43卷 3833-3843页

作者： zhi Gong zhi-Kui Dai zhi-Yue Dong Qiu-Xuan Liu Valentin A.Milichko Hua-jian Liu Jie Liu Ran niu jiang Gong Key Laboratory of Material Chemistry for Energy Conversion and Storage Hubei Key Laboratory of Material Chemistry and Service FailureHubei Engineering Research Center for Biomaterials and Medical Protective MaterialsSemiconductor Chemistry CenterSchool of Chemistry and Chemical EngineeringMinistry of EducationHuazhong University of Science and TechnologyWuhan 430074China School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430073China Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules and College of Chemistry and Chemical EngineeringHubei UniversityWuhan 430062China School of Physics and Engineering ITMO UniversitySt.Petersburg197101Russia School of Materials Science and Engineering Hubei UniversityWuhan430062China Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing School of Mechanical and Automotive EngineeringKey Laboratory of Polymer Processing EngineeringMinistry of EducationSouth China University of TechnologyGuangzhou 510641China

Developing luminescent metal-organic frameworks(MOFs) capable of high-efficiency Fe^(3+)sensing has aroused great attraction in the fields of biology,chemistry,***,previous solvothermal methods are limited by organic solvent usage,time consuming,high pressure,and high-energy ***,we propose the waste-toMOF strategy towards the scale-up production of La-MOF nanoparticles through the ball milling of recycled poly(-ethylene terephthalate)(PET) bottles and La(NO_(3))_(3)·_(6)H_(2)*** goes on alkaline hydrolysis to form 1,4-benzenedicarboxylic acid sodium salt(Na_(2)BDC) and ethylene glycol by ball ***,BDC reacts with La^(3+)to form *** as-prepared La-MOF crystal nanoparticles possess a rod-like morphology with the size of few hundred ***,La-MOF nanoparticles display high selectivity and sensitivity for Fe^(3+)*** quenching constant and limit of detection are 5.29×10^(3)(mol·L^(-1))^(-1) and 0.147 μmol·L^(-1),respectively,thus surpassing many advanced Fe^(3+) *** to the result of density functional theory,the high Fe^(3+) detection performance of La-MOF is related to the complexing of Fe^(3+)with La-MOF,which leads to the gradual dissociation of the coordination bond between terephthalic acid and La^(3+).It is anticipated that the mechanochemistry milling-based wasteto-MOF strategy provides a new platform for the massive production of functional MOFs in a green manner.

关键词： Metal-organic framework Waste polyester Mechanochemistry milling Fluorescence sensor

2016~2021年秋冬季邯郸市PM_(2.5)污染特征与来源对比

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环境科学 2025年第1期46卷 591-602页

作者：马心怡纪晓腾马博健田宇婷朱浩牛红亚河北工程大学地球科学与工程学院邯郸056038 河北先进环保产业创新中心有限公司石家庄050000

2018年国务院发布《打赢蓝天保卫战三年行动计划》(蓝天保卫战),为研究邯郸市秋冬季在蓝天保卫战前期(第一阶段)、中期(第二阶段)和后期(第三阶段)PM_(2.5)污染特征与来源,于2016~2021年秋冬季采集PM_(2.5)样品,基于8种水溶性离子、EC... 详细信息

2018年国务院发布《打赢蓝天保卫战三年行动计划》(蓝天保卫战),为研究邯郸市秋冬季在蓝天保卫战前期(第一阶段)、中期(第二阶段)和后期(第三阶段)PM_(2.5)污染特征与来源,于2016~2021年秋冬季采集PM_(2.5)样品,基于8种水溶性离子、EC和OC浓度数据,通过正定矩阵因子分解模型(PMF)、后向轨迹和潜在源贡献因子(PSCF)分析法对其进行来源解析.结果表明,近几年PM_(2.5)年度和秋冬季浓度均值整体呈降低趋势,采样期间3个阶段中水溶性离子(WSIIs)和总碳(TC)浓度也均逐阶段下降,第三阶段(52.70μg·m^(-3)和17.17μg·m^(-3))相较第一阶段(80.23μg·m^(-3)和46.89μg·m^(-3))浓度分别下降了34.31%和63.38%,但其中二次组分占比的变化规律不同.3个阶段中SNA浓度分别占PM_(2.5)总浓度的46.79%、48.86%和43.22%;SOC在PM_(2.5)中的占比为12.43%、14.05%和6.81%,占比均先上升后下降. 3个阶段中SOR均值分别为0.34、0.37和0.36,NOR为0.23、0.28和0.28,说明蓝天保卫战期间二次转化程度最高.从污染物来源看,邯郸市PM_(2.5)主要来源为二次源、燃烧源、工业源、交通源和扬尘源,蓝天保卫战期间一次排放有所下降(主要是燃烧源与工业源),结束后一次排放上升,其中工业源贡献率从12.17%上升到20.20%,且经后向轨迹聚类分析可知第二阶段二次源贡献率明显高于其他阶段,尤其是来自山东和陕西的气流.潜在源分析表明3个阶段WPSCF高值区域均主要集中在河北南部和河南北部,不同的是第三阶段相比第一阶段的潜在源区由山西中部向南部转移.这项工作证实了蓝天保卫战的环境效益明显,随着蓝天保卫战的开展,二次组分贡献突出;蓝天保卫战结束之后,二次组分占比下降,一次组分的影响增大,应加强对直接排放的管控.

关键词： PM_(2.5) 蓝天保卫战水溶性离子碳质气溶胶来源解析

Model predictive control with an on-line identification model of a supply chain unit

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第5期11卷 394-400页

作者： jian niu Zu-hua XU Jun ZHAO zhi-jiang SHAO Ji-xin QIAN State Key Lab of Industrial Control Technology Zhejiang University Hangzhou 310027 China

A model predictive controller was designed in this study for a single supply chain unit.A demand model was described using an autoregressive integrated moving average(ARIMA) model,one that is identified on-line to forecast the future *** was used to modify the demand prediction,and profit was chosen as the control *** imitate reality,the purchase price was assumed to be a piecewise linear form,whereby the control objective became a nonlinear *** addition,a genetic algorithm was introduced to solve the *** were put on the predictive inventory to control the inventory fluctuation,that is,the bullwhip effect was *** model predictive control(MPC) method was compared with the order-up-to-level(OUL) method in *** results revealed that using the MPC method can result in more profit and make the bullwhip effect controllable.

关键词： Supply chain Model predictive control On-line identification Optimization with constraint Piecewise linear price

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与动物共舞:汉画舞蹈中的活道具舞一瞥

贵州大学学报(艺术版) 2025年第1期39卷 26-36页

作者：刘建牛锡桐北京舞蹈学院舞蹈学系北京100081 中国科学院大学人居科学学院北京101408

按照物理构形,汉画舞蹈在大类中划分出了徒手舞和道具舞,后者力压前者;在后者中,又分出一体性道具舞和分离性道具舞,后者比前者复杂;而在后者的后者中还应该分出无生命体的“死道具”和有生命体“活道具”——动物。这些动物与汉画舞蹈... 详细信息

按照物理构形,汉画舞蹈在大类中划分出了徒手舞和道具舞,后者力压前者;在后者中,又分出一体性道具舞和分离性道具舞,后者比前者复杂;而在后者的后者中还应该分出无生命体的“死道具”和有生命体“活道具”——动物。这些动物与汉画舞蹈息息相关,在人之借体共生为假形舞的同时,还与人分体共舞——包括“小物”的小动物和“大物”的大动物,且不同于现代马戏。在对人与动物的描述中,由二者借体共生进入到分体共舞;继而由分体共舞中分出活道具的“小物”与“大物”;最后在古今马戏之不同中说明汉画舞蹈中人与动物共舞的价值。

关键词：汉画活道具舞 “小物”与“大物” 价值取向

基于状态反馈和输出反馈的离散线性多智能体系统的二分一致性研究

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控制与决策 2025年第02期40卷 537-545页

作者：姚瑶张捷王健安李晓磊李志强太原科技大学电子信息工程学院先进控制与装备智能化山西省重点实验室燕山大学电气工程学院中国电子科技集团公司第三十二研究所

基于状态反馈和输出反馈控制方法,解决离散线性领导-跟随多智能体系统的二分状态一致性跟踪控制问题,领导者具有离散自治动态并能够产生理想参考轨迹信号.首先,基于盖尔圆盘定理和离散代数黎卡提方程提出一种新型分布式状态反馈控制协议... 详细信息

基于状态反馈和输出反馈控制方法,解决离散线性领导-跟随多智能体系统的二分状态一致性跟踪控制问题,领导者具有离散自治动态并能够产生理想参考轨迹信号.首先,基于盖尔圆盘定理和离散代数黎卡提方程提出一种新型分布式状态反馈控制协议,基于系统拓扑矩阵设计的控制耦合增益能够使得全局跟踪误差系统包含在单位圆的稳定域内.在结构平衡条件下,通过Lyapunov稳定性理论和分离原理可证明符号有向图下两个对立子组的智能体可实现二分状态一致.然后,基于邻居合作-竞争交互信息引入新型分布式状态观测器以实现跟随者状态的跟踪,进而提出一类基于观测器的输出反馈二分控制协议,在状态不可获知情况下可实现理想的领导-跟随二分状态跟踪,也可应用于更一般的传统一致性控制场景.最后,给出两个仿真算例验证所提出算法的可行性和有效性.

关键词：离散动态多智能体系统稳定域二分状态一致代数黎卡提方程