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Solvent-free carbon sphere nanofluids towards intelligent lubrication regulation

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Friction 2024年第1期12卷 95-109页

作者： Sheng ZHANG wen LI Xiaoliang MA xiaoqiang FAN Minhao ZHU Tribology Research Institute School of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

By simply switching the electrical circuit installed on steel/steel contact,the tribological behaviors of nanofluids(NFs)can be regulated in real time,thereby achieving the desired performance of friction reduction and wear resistance.Herein,solvent-free carbon spherical nanofluids(C-NFs)were successfully prepared for intelligent lubrication regulation.C-NFs with excellent lubrication performance can immediately reduce the coefficient of friction(COF)despite applying a weak electric potential(1.5 V).Moreover,polyethylene glycol 400(PEG400)containing 5.0 wt%C-NFs remained responsive to electrical stimulation under the intermittent voltage application with an average coefficient of friction(ACOF)reduction of 20.8%over PEG400.Such intelligent lubrication regulation of C-NFs under an external electric field(EEF)mainly depends on the orderly arranged double-electric adsorption film of ion canopy-adsorbed carbon spheres(CSs).The intermittent electrical application can continuously reinforce the adsorption film and its durability for real-time controlling the sliding interfaces.Electrical-stimulation-responsive intelligent lubricants provide a new technical support for realizing intelligent stepless control of devices.

关键词： solvent-free carbon spherical nanofluids(C-NFs) intelligent lubrication regulation lubrication performance adsorption film

教育信息化背景下课程资源体系建设的研究与探讨

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科技风 2024年第2期 44-46页

作者：文孝强孙媛媛姜文娟李元昕梁延东东北电力大学吉林吉林132012

随着“互联网+”向纵深化快速发展,当代大学实体教育体系也迎来前所未有之大变革,传统的教育教学体系与模式已经不能很好地满足受教人群日益增长的对高等教育教学资源的需求。顺应时代发展要求,适时构建和完善网络化、信息化课程资源体... 详细信息

随着“互联网+”向纵深化快速发展,当代大学实体教育体系也迎来前所未有之大变革,传统的教育教学体系与模式已经不能很好地满足受教人群日益增长的对高等教育教学资源的需求。顺应时代发展要求,适时构建和完善网络化、信息化课程资源体系很有必要。本文以高校数字信息化教学平台为主要依托,构建电力院校专业核心课程资源体系,以我校热工自动化专业为主要服务对象,组建灵活多样的网络化线上线下教学资源,实现大学生学科知识与综合能力的全面提升。

关键词：高等教育教育信息化课程资源建设

Modeling of coal consumption rate based on wavelet neural network

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第3期8卷 78-92页

作者： xiaoqiang wen Shuguang Jian Department of Automation Northeast Electric Power University Jilin P.R.China

In this paper,two wavelet neural network(WNN)frames which depend on Morlet wavelet function and Gaussian wavelet function were established.In order to improve the efficiency of model training,the momentum term was applied to modify the weights and thresholds,and the output of the network was summed up by function transformation of output layer nodes.When the Gaussian Wavelet Neural Networks(GWNN)and Morlet Wavelet Neural Networks(MWNN)were applied to coal consumption rate(CCR)estimation in a thermal power plant,the results confirmed their potency in function approximation.In addition,the influence of learning rate on the models was also discussed through the orthogonal experiment.

关键词： Wavelet neural network Morlet wavelet function Gaussian wavelet function estimation coal consumption rate

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基于Spark集群的火电机组经济性挖掘

吉林电力 2024年第3期52卷 32-35,51页

作者：文孝强武智斌李志伟刘长良归一数蔚伟丁宇鸣东北电力大学吉林吉林132012 华北电力大学河北保定071066 上海明华电力科技有限公司上海200080 华电电力科学研究院有限公司杭州310030

以电厂经济性为挖掘目标,把供电煤耗率作为机组的评价指标,通过最大信息系数法对影响机组煤耗率的运行参数进行特征选择。对基于Spark的并行Mini Batch K-means算法对外部约束条件进行工况划分以及数据离散化,采用并行FP-growth算法挖... 详细信息

以电厂经济性为挖掘目标,把供电煤耗率作为机组的评价指标,通过最大信息系数法对影响机组煤耗率的运行参数进行特征选择。对基于Spark的并行Mini Batch K-means算法对外部约束条件进行工况划分以及数据离散化,采用并行FP-growth算法挖掘出机组全工况的强关联规则,进而得到机组重要参数的运行优化指导方案。以某电厂机组为例,结果表明,该方法能够提高数据挖掘效率并完成电厂参数最优值的确定,根据挖掘结果可以更好地对机组人员进行指导。

关键词：火电大数据 Spark 关联规则数据挖掘

Agriculture green development in China: insights and advances

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Frontiers of Agricultural Science and Engineering 2024年第1期11卷 5-19,I0005页

作者： Jianbo SHEN Qichao ZHU Yong HOU wen-Feng CONG wen XU Jiuliang XU Zhichao AN xiaoqiang JIAO Kai ZHANG Tianxiang YU Lin MA Oene OENEMA William J.DAVIES Fusuo ZHANG State Key Laboratory of Nutrient Use and Management College of Resources and Environmental SciencesNational Academy of Agriculture Green DevelopmentChina Agricultural UniversityBeijing 100193China Key Laboratory of Agricultural Water Resources Center for Agricultural Resources ResearchInstitute of Genetic and Developmental BiologyChinese Academy of SciencesShijiazhuang 050021China Wageningen Environmental Research Wageningen University&ResearchWageningen6700 AAthe Netherlands Lancaster Environment Centre University of LancasterLancasterLA14YQUK

Reconciling the tasks of producing adequate amounts of nutritious food for the increasing global population while preserving the environment and natural ecosystems simultaneously is an enormous challenge. The concept of agriculture green development(AGD) and the necessary governmental policies were developed to address the aforementioned challenge in China and to help achieve the related global sustainable development goals. Agriculture green development emphasizes the synergy between green and development;current agriculture has to transform from the intensive farming with high inputs, high environmental impacts and low resource-use efficiency to a more sustainable agriculture, in order to ensure an adequate supply of nutritious food while delivering environmental integrity, improved economic profitability,and social equity. A research program on AGD was established by China Agricultural University with four research themes, namely: green crop production, green integrated crop-animal production, green food and industry,and green ecological environment and ecosystem services, to provide a scientific basis for future developments and to facilitate the implementation of AGD in practice. AGD requires a multistakeholder approach, fueled by innovative and interdisciplinary research. Joint actions have to be taken by governments, farmers, supply industries, consumers, educators, extension services and researchers to support AGD. This requires strong coordination and public awareness campaigns. This review presents the progress that has been made over the past 5 years and makes recommendations for more research and development, in order to better deliver agricultural green and sustainable development on national and international scales.

关键词： Agriculture ecosystem services environmental protection food security green development multi-sectoral cooperation sustainable development

Thermodynamic theory of flotation for a complex multiphase solid -liquid system and high-entropy flotation

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1177-1197页

作者： Shuming wen State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China

The flotation of complex solid–liquid multiphase systems involve interactions among multiple components,the core problem facing flotation theory.Meanwhile,the combined use of multicomponent flotation reagents to improve mineral flotation has become an important issue in studies on the efficient use of refractory mineral resources.However,studying the flotation of complex solid–liquid systems is extremely difficult,and no systematic theory has been developed to date.In addition,the physical mechanism associated with combining reagents to improve the flotation effect has not been unified,which limits the development of flotation theory and the progress of flotation technology.In this study,we applied theoretical thermodynamics to a solid–liquid flotation system and used changes in the entropy and Gibbs free energy of the reagents adsorbed on the mineral surface to establish thermodynamic equilibrium equations that de-scribe interactions among various material components while also introducing adsorption equilibrium constants for the flotation reagents adsorbed on the mineral surface.The homogenization effect on the mineral surface in pulp solution was determined using the chemical potentials of the material components of the various mineral surfaces required to maintain balance.The flotation effect can be improved through synergy among multicomponent flotation reagents;its physical essence is the thermodynamic law that as the number of compon-ents of flotation reagents on the mineral surface increases,the surface adsorption entropy change increases,and the Gibbs free energy change of adsorption decreases.According to the results obtained using flotation thermodynamics theory,we established high-entropy flotation theory and a technical method in which increasing the types of flotation reagents adsorbed on the mineral surface,increasing the adsorption entropy change of the flotation reagents,decreasing the Gibbs free energy change,and improving the adsorption efficiency and stability of the flotation reagents improve

关键词： multicomponent flotation reagent adsorption entropy change equations of thermodynamic equilibrium adsorption equilibri-um constant high-entropy flotation

基于EMD分解的风力机功率特性分析与预测建模

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太阳能学报 2021年第11期42卷 293-298页

作者：文孝强许洋东北电力大学自动化工程学院吉林132012 吉林省精密驱动智能控制国际联合研究中心吉林132012

以实际风力机功率数据为基础,通过经验模态分解(EMD)将风力机功率时间序列分解为多个特征模态函数。利用分形理论对风力机功率时间序列各分量的局部时频特性进行研究判断,并对新的风力机功率时间序列进行重构。然后,利用最大Lyapunov指... 详细信息

以实际风力机功率数据为基础,通过经验模态分解(EMD)将风力机功率时间序列分解为多个特征模态函数。利用分形理论对风力机功率时间序列各分量的局部时频特性进行研究判断,并对新的风力机功率时间序列进行重构。然后,利用最大Lyapunov指数等特性指标分析风力机功率时间序列的混沌特性,并分别分析3个尺度子序列的行为动力学特性。最后,建立基于蚁群优化极值学习机制,构建风力机功率时间序列预测模型。仿真结果表明,该模型比其他单一预测模型具有更高的预测精度,可用于工程实际。

关键词：风力机功率预测建模神经网络 EMD 蚁群优化

Goal-Oriented Control Systems(GOCS):From HOW to WHAT

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 816-819页

作者： wen-Hua Chen the Department of Aeronautical and Automotive Engineering Loughborough UniversityLeicestershireLE113TUU.K.

Brief:New control theory is required to underpin safe design and deployment of future highly automated systems to deal with uncertain environments and complicated tasks,enabled by AI and other advanced technologies.Goal-Oriented Control Systems offer potential to transform the control system design from currently instructing a control system how to perform a task to specifying what is to be achieved.

关键词： automated instru system

Observation of gapless corner modes of photonic crystal slabs in synthetic translation dimensions

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Photonics Research 2024年第3期12卷 444-455页

作者： wen-JIN ZHANG HAO-CHANG MO wen-JIE CHEN XIAO-DONG CHEN JIAN-wen DONG School of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China

Second-order topological photonic crystals support localized corner modes that deviate from the conventional bulk-edge correspondence.However,the frequency shift of corner modes spanning the photonic band gap has not been experimentally reported.Here,we observe the gapless corner modes of photonic crystal slabs within a parameter space by considering translation as an additional synthetic dimension.These corner modes,protected by topological pumping in synthetic translation dimensions,are found to exist independently of the specific corner configuration.The gapless corner modes are experimentally imaged via the near-field scanning measurement and validated numerically by full-wave simulations.We propose a topological rainbow with gradient translation,demonstrating the ability to extract and separate specific frequency components of light into different spatial locations.Our work contributes to the advancement of topological photonics and provides valuable insights into the exploration of gapless corner modes in synthetic dimensions.

关键词： translation dimensions corner