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China CDC weekly 2023年第46期5卷 1029-1037,I0005-I0007页

作者： kaiqiang yu Bixi Zhao yuxi Yan Qing Yang Liming Chen yu Xia School of Environmental Science and Engineering College of EngineeringSouthern University of Science and TechnologyShenzhen CityGuangdong ProvinceChina School of Resource Environment and Life ScienceNingxia Normal UniversityGuyuan CityGansu ProvinceChina State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen CityGuangdong ProvinceChina Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen CityGuangdong ProvinceChina

ABSTRACT Introduction:The use of reclaimed water(RW)for irrigation in agricultural practices raises concerns regarding the dissemination of antibiotic resistance genes(ARGs)from soils to edible *** effectiveness of na... 详细信息

关键词： Antibiotic Guangdong claimed

A partition approach for robust gait recognition based on gait template fusion

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Frontiers of Information Technology & Electronic Engineering 2021年第5期22卷 709-719页

作者： Kejun WANG Liangliang LIU Xinnan DING kaiqiang yu Gang HU College of Intelligent Systems Science and Engineering Harbin Engineering UniversityHarbin 150001China

Gait recognition has significant potential for remote human identification,hut it is easily influenced by identity-unrelated factors such as clothing,carrying conditions,and view *** gait templates have been presented that can effectively represent gait *** gait template has its advantages and can represent different prominent *** this paper,gait template fusion is proposed to improve the classical representative gait template(such as a gait energy image)which represents incomplete information that is sensitive to changes in *** also present a partition method to reflect the different gait habits of different body parts of each *** fused template is cropped into three parts(head,trunk,and leg regions)depending on the human body,and the three parts are then sent into the convolutional neural network to learn merged *** present an extensive empirical evaluation of the CASIA-B dataset and compare the proposed method with existing *** results show good accuracy and robustness of the proposed method for gait recognition.

关键词： Gait recognition Partition algorithms Gait templates Gait analysis Gait energy image Deep convolutional neural networks Biometrics recognition Pattern recognition

催化氧化法处理VOC废气在乙二醇装置中的应用

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山东化工 2020年第10期49卷 247-249,252页

作者：喻凯强中国石化镇海炼化分公司浙江宁波315207

本文主要阐述了催化氧化法处理VOC废气在镇海炼化乙二醇装置的应用结果。装置新增一套催化氧化系统处理解析气中的VOC,该催化氧化系统已运行了一年,VOC排放由600mg/m^3降低至12mg/m^3,实现了达标排放。

关键词： VOC排放催化氧化乙二醇装置

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金属切削刀具结构优化与仿真分析

工具技术 2017年第6期51卷 69-72页

作者：于凯强郭文亮贾涛太原理工大学

本文研究了优化设计的刀具结构对刀具切削性能的影响。优化后的刀具结构使切削液从刀具内部通过,在刀具内部形成强制对流。COMSOL Multiphysics软件仿真结果显示,优化后的刀具结构不仅满足应力强度要求,而且使刀具的工作温度大幅度降低... 详细信息

本文研究了优化设计的刀具结构对刀具切削性能的影响。优化后的刀具结构使切削液从刀具内部通过,在刀具内部形成强制对流。COMSOL Multiphysics软件仿真结果显示,优化后的刀具结构不仅满足应力强度要求,而且使刀具的工作温度大幅度降低。切削过程中,刀具温度的降低,可降低由切削热引起的热应力和热变形。因此,优化后的刀具结构可极大地降低刀具磨损、增加刀具使用寿命,使零件的加工精度和表面质量得以大幅度提升。

关键词：刀具结构 COMSOL Multiphysics 应力温度

Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

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Journal of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： WANG yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimality method, the Pareto game is equivalently converted to an optimal control problem. In the first place,the feedback form of Pareto optimal strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential equation(MF-FSDE),and a mean-field backward stochastic differential equation(MF-BSDE). In addition, the corresponding Pareto optimal solution is further obtained. Finally, the author solves a problem in mathematical finance to illustrate the application of the theoretical results.

关键词： Backward stochastic differential equation linear-quadratic control mean-field Pareto optimality

基于ANSYS Workbench完井管柱流固耦合振动固有频率分析

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油气井测试 2018年第1期27卷 1-7页

作者：曹银萍黄宇曦于凯强窦益华西安石油大学机械工程学院陕西西安710065 中航富士达科技股份有限公司陕西西安71000

试油完井工况下,处于高温高压环境中的管柱易受到压力、轴向力、温度以及流固耦合作用的影响而引发振动。以完井管柱为研究对象,在ANSYS Workbench中建立完井管柱的有限元模型,用六面体八节点单元进行了网格划分,并对流体和固体设置流... 详细信息

试油完井工况下,处于高温高压环境中的管柱易受到压力、轴向力、温度以及流固耦合作用的影响而引发振动。以完井管柱为研究对象,在ANSYS Workbench中建立完井管柱的有限元模型,用六面体八节点单元进行了网格划分,并对流体和固体设置流固耦合交界面,分析了内压、轴向力以及流固耦合作用对完井管柱固有频率的影响。研究结果表明,完井管柱的固有频率随着管柱内压的增加而减小;完井管柱固有频率随着轴向力的增加而增加;流固耦合作用会降低管柱的固有频率。当管柱内流体为天然气时,管柱的固有频率减小1.4%;当管柱内流体为水时,管柱的固有频率减少18%,液体与管柱流固耦合作用对管柱固有频率的影响大于气体。该分析为试油完井管柱安全性评估和结构优化提供了理论支持。

关键词：试油完井管柱固有频率流固耦合模态分析 ANSYS Workbench 有限元分析

Approximate analytical solutions for threedimensional ascent trajectory of a solid-fuel launch vehicle with time-varying mass flow rate

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Chinese Journal of Aeronautics 2024年第10期37卷 275-293页

作者： Qi yu Wanchun CHEN Wenbin yu School of Astronautics Beihang UniversityBeijing 102206China

In the scenario that a solid-fuel launch vehicle maneuvers in outer space at high angles of attack and sideslip for energy management,Approximate Analytical Solutions(AAS)for the threedimensional(3D)ascent flight states are derived,which are the only solutions capable of considering time-varying Mass Flow Rate(MFR)at *** uneven MFR makes the thrust vary nonlinearly and thus increases the difficulty of the problem *** AAS are derived based on a 3D Generalized Ascent Dynamics Model(GADM)with a normalized mass as the independent *** simplify some highly nonlinear terms in the GADM,several approximate functions are introduced carefully,while the errors of the approximations relative to the original terms are regarded as minor ***,a finite series with positive and negative exponents,called Exponent-Symmetry Series(ESS),is proposed for function approximation to decrease the highest exponent in the AAS so as to reduce computer round-off *** calculate the ESS coefficients,a method of seeking the Optimal Interpolation Points(OIP)is proposed using the leastsquares-approximation *** to the artful design of the approximations,the GADM can be decomposed into two analytically solvable subsystems by a perturbation method,and thus the AAS are obtained ***,to help implement the AAS,two indirect methods for measuring the remaining mass and predicting the burnout time in flight are put forward using information from *** results verify the superiority of the AAS under the condition of time-varying MFR.

关键词： Approximate analytical solutions 3D ascent trajectory Solid-fuel launch vehicle Uneven thrust Energy management

Low-melting mixture solvents: extension of deep eutectic solvents and ionic liquids for broadening green solvents and green chemistry

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Green Chemical Engineering 2024年第4期5卷 409-417页

作者： yu Chen Zhiwu yu MOE Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical Biology Department of ChemistryTsinghua University

Green solvents such as water and ionic liquids(ILs) are pillars of the great mansion of green chemistry and green processing. Initially proposed as a new family of ILs,deep eutectic solvents(DESs) have received fast development in the past two decades. In this contribution,DESs are reviewed critically and the concept is extended to lowmelting mixture solvents(Lo MMSs),which cover all kinds of materials including ionic compounds,molecular compounds,and metals. Six classes of Lo MMSs are proposed as the new classification system and examples are given. Finally,several thermodynamic issues concerning Lo MMSs are discussed. Two new concepts,robustness of Lo MMSs and high-entropy Lo MMSs,are proposed.

关键词： Green solvents Deep eutectic solvents Low transition temperature mixture solvents Phase diagram EGaIn

Topological Stability and Entropy for Certain Set-valued Maps

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Acta Mathematica Sinica,English Series 2024年第4期40卷 962-984页

作者： yu ZHANG yu Jun ZHU School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

In this paper,the dynamics(including shadowing property,expansiveness,topological stability and entropy)of several types of upper semi-continuous set-valued maps are mainly considered from differentiable dynamical systems points of *** is shown that(1)if f is a hyperbolic endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that the induced set-valued map F_(f,U)has theε-shadowing property,and moreover,if f is an expanding endomorphism then there exists a C^(1)-neighborhood U of f such that the induced set-valued map F_(f,U)has the Lipschitz shadowing property;(2)when a set-valued map F is generated by finite expanding endomorphisms,it has the shadowing property,and moreover,if the collection of the generators has no coincidence point then F is expansive and hence is topologically stable;(3)if f is an expanding endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that h(F_(f,U,ε))=h(f);(4)when F is generated by finite expanding endomorphisms with no coincidence point,the entropy formula of F is ***,the dynamics of the set-valued maps based on discontinuous maps on the interval are also considered.

关键词： Set-valued map orbit space hyperbolic endomorphism perturbation shadowing expansiveness topological stability entropy

A new liquid membrane diffusion model for characterizing the adsorption kinetics of europium by using a continuous measurement of adsorption platform

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Nuclear Science and Techniques 2024年第1期35卷 59-72页

作者： Hao-Qi yu Tao yu Jian-Hua Ye State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China CGN Cangnan Nuclear Power Co. Ltd.Cangnan 325800China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

To explore the kinetic adsorption under continuous and nonequilibrium states, an integration of continuous measurement and adsorption platform kinetics method was proposed, which was initially called the ICM-AP kinetics method, and a corresponding kinetic adsorption experimental method was developed. Adsorption experiments of europium(Eu) on Ca-bentonite,Na-bentonite, and the D231 cation exchange resin were performed using the ICM-AP kinetics method and continuous measurements. Because the kinetic experimental results observed in this study were different from those of traditional batch adsorption data, pseudo-first-order or pseudo-second-order kinetic models were unsuitable for fitting the experimental ***, a liquid membrane diffusion(LMD) model was developed based on the assumption of simultaneous adsorption/desorption to discuss the mechanism of kinetic adsorption. The kinetic adsorption mechanism was also studied by using *** results indicated that the proposed adsorption model can fit the experimental data more suitably, and the adsorption/desorption behaviors of Eu on bentonite and the D231 resin were simultaneously observed, suggesting that the adsorption kinetics of Eu(Ⅲ) was mainly dominated by hydrated Eu(Ⅲ) ions on the liquid membrane.

关键词： ICM-AP method LMD model Adsorption mechanism Eu(Ⅲ)