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Small activation entropy bestows high-stability of nanoconfined D-mannitol

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Chinese Physics B 2021年第7期30卷 376-381页

作者： Lin cao Li-Jian Song Ya-Ru cao Wei Xu Jun-Tao Huo Yun-Zhuo Lv Jun-Qiang Wang School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of Sciences(CAS)Ningbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

It has been a long-standing puzzling problem that some glasses exhibit higher glass transition temperatures(denoting high stability)but lower activation energy for relaxations(denoting low stability).In this paper,the relaxation kinetics of the nanoconfined D-mannitol(DM)glass was studied systematically using a high-precision and high-rate *** nanoconfined DM exhibits enhanced thermal stability compared to the free *** example,the critical cooling rate for glass formation decreases from 200 K/s to below 1 K/s;the Tg increases by about 20 K–50 *** relaxation kinetics is analyzed based on the absolute reaction rate *** is found that,even though the activation energy E^(*)decreases,the activation entropy S^(*)decreases much more for the nanoconfined glass that yields a large activation free energy G^(*)and higher thermal *** results suggest that the activation entropy may provide new insights in understanding the abnormal kinetics of nanoconfined glassy systems.

关键词： D-mannitol glass confinement relaxation activation entropy

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水环境恢复原理及我国的工程实践

北京工业大学学报 2006年第2期32卷 161-166页

作者：张杰曹相生孟雪征北京工业大学建筑工程学院水质科学与水环境恢复工程北京市重点实验室北京100022

水资源短缺和水体污染是水环境问题的2个主要方面．目前这2个问题在我国都没有解决,而且还有加重趋势．分析认为过度的水的社会循环是造成我国水环境劣化的直接原因,建立健康的社会水循环才能恢复良好水环境,从根本上解决水问题．水环... 详细信息

水资源短缺和水体污染是水环境问题的2个主要方面．目前这2个问题在我国都没有解决,而且还有加重趋势．分析认为过度的水的社会循环是造成我国水环境劣化的直接原因,建立健康的社会水循环才能恢复良好水环境,从根本上解决水问题．水环境恢复的方略包括节制用水、污水深度处理和有效利用、污水厂污泥回归农田、恢复城市雨水循环途径、面源污染控制以及水资源统筹管理等,其中,城市范畴上的污水深度处理与利用和再生水供应系统是关健,是我国水环境恢复的切入点．介绍了国内外在水环境恢复方面的研究进展情况并介绍了我国在编制国家中长期科技发展规划(2006-2020)以及深圳、大连和北京等地的工程实践．最后指出今后我国水环境恢复方面的紧迫任务,包括建立相关法律法规、开展相关教育、制定规划、相关技术研究和建立示范工程等．

关键词：水环境水污染控制水资源健康社会水循环

Porous FeAl alloys via powder sintering:Phase transformation,microstructure and aqueous corrosion behavior

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Journal of Materials Science & Technology 2021年第27期86卷 64-69页

作者： Gang Chen Klaus-Dieter Liss Chao Chen Yuehui He Xuanhui Qu Peng cao Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083PR China Materials and Engineering Science Program Guangdong Technion-Israel Institute of TechnologyShantouGuangdong515063PR China Technion-Israel Institute of Technology Haifa32000Israel School of Mechanical MaterialsMechatronic and Biomedical EngineeringFaculty of Engineering&Information SciencesUniversity of WollongongWollongongNSW2522Australia State Key Laboratory for Powder Metallurgy Central South UniversityChangsha410083PR China Department of Chemical and Materials Engineering The University of AucklandPrivate Bag 92019Auckland1142New Zealand MacDiarmid Institute of Advanced Materials and Nanotechnology Victoria University of WellingtonPO Box 600Wellington6140New Zealand

This study investigates the phase transformation and microstructure of porous Fe Al parts sintered from elemental powder mixtures using in-situ neutron diffraction and in-situ thermal dilatometry.A single B2 structured Fe Al phase was determined in the sintered Fe Al *** combined effects of the Kirkendall porosity,transient liquid phase,and phase transformations associated with powder sintering all contribute to the swelling phenomenon of the final sintered *** aqueous corrosion test indicates that the corrosion products include iron oxides in the porous Fe Al *** accumulation of corrosion products blocks the pore channel and decreases pore size and permeability over the soaking time.

关键词： Powder sintering Intermetallic Porous Corrosion Neutron diffraction

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产业结构升级对共同富裕的影响及机制研究

经济问题探索 2023年第6期 140-156页

作者：张凯曹斌李容深圳大学深圳南特金融科技学院广东深圳518060 深圳大学微众银行金融科技学院广东深圳518060 深圳大学中国经济特区研究中心广东深圳518060

本文用富裕度和共同度两个维度构建了测度共同富裕水平的指标体系,检验了产业结构升级水平对共同富裕的影响效应,并进行了机制研究。结果表明:产业结构升级水平显著的提高了共同富裕水平,在进行了工具变量法和变量替代法等稳健性检验后... 详细信息

本文用富裕度和共同度两个维度构建了测度共同富裕水平的指标体系,检验了产业结构升级水平对共同富裕的影响效应,并进行了机制研究。结果表明:产业结构升级水平显著的提高了共同富裕水平,在进行了工具变量法和变量替代法等稳健性检验后结果仍然成立。在此基础上验证了区域间产业结构升级耦合协调度的正向调节作用及经济发展水平、劳动生产率、新型城镇化水平的中介作用。在进一步的研究中,采用门槛效应和空间效应模型,发现产业结构升级对共同富裕水平的影响存在“边际”先递增后递减效应及正向空间溢出效应。

关键词：产业结构升级共同富裕耦合协调度中介效应调节效应

Gouge stability controlled by temperature elevation and obsidian addition in basaltic faults and implications for moonquakes

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International Journal of Mining Science and Technology 2024年第9期34卷 1273-1282页

作者： Shutian cao Fengshou Zhang Mengke An Derek Elsworth Manchao He Hai Liu Luanxiao Zhao Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterThe Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Geosciences The Pennsylvania State UniversityUniversity ParkPA 16802USA State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Civil Engineering Guangzhou UniversityGuangzhou 510006China School of Ocean and Earth Sciences Tongji UniversityShanghai 200092China

Basalt is a major component of the earth and moon *** composition and temperature influence frictional instability and thus the potential for seismicity on basaltic *** performed velocitystepping shear experiments on basalt gouges at a confining pressure of 100 MPa,temperatures in the range of 100-400℃ and with varied obsidian mass fractions of 0-100%under wet/dry conditions to investigate the frictional strength and stability of basaltic *** observe a transition from velocity-neutral to velocity-weakening behaviors with increasing obsidian *** frictional stability response of the mixed obsidian/basalt gouges is characterized by a transition from velocitystrengthening to velocity-weakening at 200℃ and another transition to velocity-strengthening at temperatures>300℃.Conversely,frictional strengths of the obsidian-bearing gouges are insensitive to temperature and wet/dry *** results suggest that obsidian content dominates the potential seismic response of basaltic faults with the effect of temperature controlling the range of seismogenic ***,shallow moonquakes tend to occur in the lower lunar crust due to the corresponding anticipated higher glass content and a projected temperature range conducive to velocity-weakening *** observations contribute to a better understanding of the nucleation mechanism of shallow seismicity in basaltic faults.

关键词： Fault stability Basaltic fault Temperature elevation Obsidian content Shallow moonquakes

Research on simulation of gun muzzle flow field empowered by artificial intelligence

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Defence Technology（防务技术） 2024年第2期32卷 196-208页

作者： Mengdi Zhou Linfang Qian Congyong cao Guangsong Chen Jin Kong Ming-hao Tong School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Northwest Institute of Mechanical and Electrical Engineering Xianyang712099ShaanxiChina School of Automation Nanjing University of Science and TechnologyNanjing210094China

Artificial intelligence technology is introduced into the simulation of muzzle flow field to improve its simulation efficiency in this paper.A data-physical fusion driven framework is ***,the known flow field data is used to initialize the model parameters,so that the parameters to be trained are close to the optimal *** physical prior knowledge is introduced into the training process so that the prediction results not only meet the known flow field information but also meet the physical conservation *** two examples,it is proved that the model under the fusion driven framework can solve the strongly nonlinear flow field problems,and has stronger generalization and *** proposed model is used to solve a muzzle flow field,and the safety clearance behind the barrel side is *** is pointed out that the shape of the safety clearance under different launch speeds is roughly the same,and the pressure disturbance in the area within 9.2 m behind the muzzle section exceeds the safety threshold,which is a dangerous *** with the CFD results shows that the calculation efficiency of the proposed model is greatly improved under the condition of the same calculation *** proposed model can quickly and accurately simulate the muzzle flow field under various launch conditions.

关键词： Muzzle flow field Artificial intelligence Deep learning Data-physical fusion driven Shock wave

Multidiscipline Applications of Triboelectric Nanogenerators for the Intelligent Era of Internet of Things

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Nano-Micro Letters 2023年第1期15卷 252-292页

作者： Xiaole cao Yao Xiong Jia Sun Xiaoyin Xie Qijun Sun Zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400People’s Republic of China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Physics and Electronics Central South UniversityChangsha 410083People’s Republic of China School of Chemistry and Chemical Engineering Hubei Polytechnic UniversityHuangshi 435003People’s Republic of China Shandong Zhongke Naneng Energy Technology Co. Ltd.Dongying 7061People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

In the era of 5G and the Internet of things(IoTs),vari-ous human-computer interaction systems based on the integration of triboelectric nanogenerators(TENGs)and IoTs technologies dem-onstrate the feasibility of sustainable and self-powered functional *** rapid development of intelligent applications of IoTs based on TENGs mainly relies on supplying the harvested mechanical energy from surroundings and implementing active sensing,which have greatly changed the way of human production and daily *** review mainly introduced the TENG applications in multidisci-pline scenarios of IoTs,including smart agriculture,smart industry,smart city,emergency monitoring,and machine learning-assisted artificial intelligence *** challenges and future research directions of TENG toward IoTs have also been *** exten-sive developments and applications of TENG will push forward the IoTs into an energy autonomy fashion.

关键词： Triboelectric nanogenerator Self-powered sensor Internet of things Artificial intelligence Machine learning

On Split δ-Jordan Lie Triple Systems

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Journal of Mathematical Research with Applications 2020年第2期40卷 127-139页

作者： Yan cao Liangyun CHEN Department of Mathematics Harbin University of Science and Technology School of Mathematics and Statistics Northeast Normal University

The aim of this article is to study the structures of arbitrary split δ-Jordan Lie triple systems, which are a generalization of split Lie triple systems. By developing techniques of connections of roots for this kind of triple systems, we show that any of such δ-Jordan Lie triple systems T with a symmetric root system is of the form ■with U a subspace of T0 and any I[α] a well described ideal of T, satisfying■ .

关键词： split δ-Jordan Lie triple system Lie triple system root system

BAS-ADAM:An ADAM Based Approach to Improve the Performance of Beetle Antennae Search Optimizer

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IEEE/CAA Journal of Automatica Sinica 2020年第2期7卷 461-471页

作者： Ameer Hamza Khan Xinwei cao Shuai Li Vasilios N.Katsikis Liefa Liao Department of Computing Hong Kong Polytechnic UniversityHong KongChina School of Management Shanghai UniversityShanghai 201900China Department of Electronics and Electrical Engineering Swansea UniversitySwansea SA18ENUK Department of Economics Division of Mathematics and InformaticsNational and Kapodistrian University of AthensAthens 10679Greece School of Information Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

In this paper,we propose enhancements to Beetle Antennae search(BAS)algorithm,called BAS-ADAIVL to smoothen the convergence behavior and avoid trapping in localminima for a highly noin-convex objective *** achieve this by adaptively adjusting the step-size in each iteration using the adaptive moment estimation(ADAM)update *** proposed algorithm also increases the convergence rate in a narrow valley.A key feature of the ADAM update rule is the ability to adjust the step-size for each dimension separately instead of using the same *** ADAM is traditionally used with gradient-based optimization algorithms,therefore we first propose a gradient estimation model without the need to differentiate the objective ***,it demonstrates excellent performance and fast convergence rate in searching for the optimum of noin-convex *** efficiency of the proposed algorithm was tested on three different benchmark problems,including the training of a high-dimensional neural *** performance is compared with particle swarm optimizer(PSO)and the original BAS algorithm.

关键词： Adaptive moment estimation(ADAM) Beetle antennae search(BAM) gradient estimation metaheuristic optimization nature-inspired algorithms neural network