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Numerical computation of central crack growth in an active particle of electrodes influenced by multiple factors 被引量:4
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作者 Yuwei Zhang Zhansheng Guo 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2018年第4期706-715,共10页
Mechanical degradation, especially fractures in active particles in an electrode, is a major reason why the capacity of lithiumion batteries fades. This paper proposes a model that couples Li-ion diffusion, stress evo... Mechanical degradation, especially fractures in active particles in an electrode, is a major reason why the capacity of lithiumion batteries fades. This paper proposes a model that couples Li-ion diffusion, stress evolution, and damage mechanics to simulate the growth of central cracks in cathode particles(Li Mn_2 O_4) by an extended finite element method by considering the influence of multiple factors. The simulation shows that particles are likely to crack at a high discharge rate, when the particle radius is large, or when the initial central crack is longer. It also shows that the maximum principal tensile stress decreases and cracking becomes more difficult when the influence of crack surface diffusion is considered. The fracturing process occurs according to the following stages: no crack growth, stable crack growth, and unstable crack growth. Changing the charge/discharge strategy before unstable crack growth sets in is beneficial to prevent further capacity fading during electrochemical cycling. 展开更多
关键词 Li-ion battery active particle of electrodes Central crack and growth Extended finite element method Crack surface diffusion
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Emergent Swarming States in Active Particles System with Opposite Anisotropic Interactions 被引量:1
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作者 Yong-liang Gou Hui-jun Jiang Zhong-huai Hou 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第6期717-726,I0002,共11页
From the organization of animal flocks to the emergence of swarming behaviors in bacterial suspension,populations of motile organisms at all scales display coherent collective motion.Recent studies showed that the ani... From the organization of animal flocks to the emergence of swarming behaviors in bacterial suspension,populations of motile organisms at all scales display coherent collective motion.Recent studies showed that the anisotropic interaction between active particles plays a key role in the phase behaviors.Here we investigate the collective behaviors of based-active Janus particles that experience an anisotropic interaction of which the orientation is opposite to the direction of active force by using Langevin dynamics simulations in two dimensional space.Interestingly,the system shows emergence of collective swarming states upon increasing the total area fraction of particles,which is not observed in systems without anisotropic interaction or activity.The threshold for emergence of swarming states decreases as particle activity or interaction strength increases.We have also performed basic kinetic analysis to reproduce the essential features of the simulation results.Our results demonstrate that anisotropic interactions at the individual level are sufficient to set homogeneous active particles into stable directed motion. 展开更多
关键词 active particle Anisotropic interaction SWARMING
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Effective transport of passive particles induced by chiral-active particles in microchannel
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作者 华昀峰 何林李 章林溪 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第8期108-113,共6页
Transport of passive particles induced by chiral-active particles in microchannel is investigated by using the overdamped Langevin dynamics simulation in a two-dimensional model system. Due to the chirality of active ... Transport of passive particles induced by chiral-active particles in microchannel is investigated by using the overdamped Langevin dynamics simulation in a two-dimensional model system. Due to the chirality of active particles and special structure of microchannel, effective ratchet transport of passive particles is achieved. Effective transport of passive particles depends on the width of microchannel(d), the density(ρ), and the angular velocity(ω) of chiral-active particles.There exist optimal parameters for d and ω at which the transport efficiency for passive particles takes its maximal value.This investigation can help us understand the necessity of active motion for living systems to maintain a number of vital processes such as materials transport inside cells and the foraging dynamics of mobile organisms. 展开更多
关键词 TRANSPORT active particle passive particle overdamped Langevin dynamics simulation MICROCHANNEL
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Unidirectional rotation of circles driven by chiral active particles
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作者 Jiamin Chen Xiaolin Zhou Linxi Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第11期634-640,共7页
The dynamics of two-dimensional rigid circles filled with chiral active particles are investigated by employing the overdamped Langevin dynamics simulations. Unidirectional rotation of rigid circles is observed, and t... The dynamics of two-dimensional rigid circles filled with chiral active particles are investigated by employing the overdamped Langevin dynamics simulations. Unidirectional rotation of rigid circles is observed, and the rotational angular velocity(ω) relies mainly on the length(l), the number(nB), and tilt angle(γ) of boards, and the angular velocity(ω)and area fraction(ρ) of chiral active particles. There are optimum values for these parameters at which the average angular velocity of circle reaches its maximum. The center-of-mass mean square displacement for circles drops by about two orders of magnitude for large angular velocity ω of chiral active particles with oscillations in the short-time regime. Our work demonstrates that nanofabricated objects with suitable designs immersed in a bath of chiral active particles can extract and rectify energy in a unidirectional motion. 展开更多
关键词 unidirectional rotation dynamics chiral active particle nanofabricated object
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Collective motion of polar active particles on a sphere
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作者 Yi Chen Jun Huang +2 位作者 Fan-Hua Meng Teng-Chao Li Bao-Quan Ai 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期239-244,共6页
Collective motion of active particles with polar alignment is investigated on a sphere.We discussed the factors that affect particle swarm motion and define an order parameter that can show the degree of particle swar... Collective motion of active particles with polar alignment is investigated on a sphere.We discussed the factors that affect particle swarm motion and define an order parameter that can show the degree of particle swarm motion.In the model,we added a polar alignment strength,along with Gaussian curvature,affecting particles swarm motion.We find that when the force exceeds a certain limit,the order parameter will decrease with the increase of the force.Combined with our definition of order parameter and observation of the model,the reason is that particles begin to move side by side under the influence of polar forces.In addition,the effects of velocity,rotational diffusion coefficient,and packing fraction on particle swarm motion are discussed.It is found that the rotational diffusion coefficient and the packing fraction have a great influence on the clustering motion of particles,while the velocity has little influence on the clustering motion of particles. 展开更多
关键词 clustering motion of Brownian particles polar active particles SPHERE
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Superfast and solvent-free core-shell assembly of sulfur/carbon active particles by hail-inspired nanostorm technology for high-energy-density Li-S batteries
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作者 Lanxiang Feng Zhiwei Zhu +6 位作者 Yan He Yuan Ji Xuewe He Lei Jing Mingbo Yang Wei Yang Yu Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第2期565-573,共9页
The demand on low-carbon emission fabrication technologies for energy storage materials is increasing dramatically with the global interest on carbon neutrality.As a promising active material for metal-sulfur batterie... The demand on low-carbon emission fabrication technologies for energy storage materials is increasing dramatically with the global interest on carbon neutrality.As a promising active material for metal-sulfur batteries,sulfur is of great interest due to its high-energy-density and abundance.However,there is a lack of industry-friendly and low-carbon fabrication strategies for high-performance sulfur-based active particles,which,however,is in critical need by their practical success.Herein,based on a hail-inspired sulfur nano-storm(HSN)technology developed in our lab,we report an energy-saving,solvent-free strategy for producing core-shell sulfur/carbon electrode particles(CNT@AC-S)in minutes.The fabrication of the CNT@AC-S electrode particles only involves low-cost sulfur blocks,commercial carbon nanotubes(CNT)and activated carbon(AC)micro-particles with high specific surface area.Based on the above core-shell CNT@AC-S particles,sulfur cathode with a high sulfur-loading of 9.2 mg cm^(-2) delivers a stable area capacity of 6.6 mAh cm^(-2) over 100 cycles.Furthermore,even for sulfur cathode with a super-high sulfur content(72 wt%over the whole electrode),it still delivers a high area capacity of 9 mAh cm^(-2) over50 cycles in a quasi-lean electrolyte condition.In a nutshell,this study brings a green and industryfriendly fabrication strategy for cost-effective production of rationally designed S-rich electrode particles. 展开更多
关键词 Core-shell assembly Sulfur/carbon secondary active particles High energy density lithium sulfur batteries Thick sulfur electrode Hail-inspired sulfur nanostorm technology
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Screening on the Pharmacodynemic Active Parts of Protecting Liver of Peristrope japonica (thunb.)Bremek
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作者 杨希雄 皮慧芳 +2 位作者 张国欣 庞雪冰 吴继洲 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2004年第5期525-527,共3页
The pharmacodynamic active parts of protecting liver of Peristrope japonica (thunb.)Bremek were identified. Rat acute liver injury model was induced by D-galactosamine (D-GlaN). The active parts were identified on the... The pharmacodynamic active parts of protecting liver of Peristrope japonica (thunb.)Bremek were identified. Rat acute liver injury model was induced by D-galactosamine (D-GlaN). The active parts were identified on the whole extraction and 4 fractions. The results showed that the pharmacodynamic active parts of Peristrope japonica were the n-BuOH fraction. 展开更多
关键词 Peristrope japonica (thunb.)Bremek protecting liver active parts
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OBSERVING THE ENTIRE GLOBE FOR THE GOOD OF THE MANKIND——China takes an Active Part in Activities of the“International Space Year”
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作者 Chen Shupeng 《遥感信息》 CSCD 1990年第A02期2-2,共1页
The experience of the mankind in studying the planet of our own, is long and the progress is accelerated. From the numerous geographic adventures organized in the past thousand years came only the brief knowledge of t... The experience of the mankind in studying the planet of our own, is long and the progress is accelerated. From the numerous geographic adventures organized in the past thousand years came only the brief knowledge of the outline of the land and ocean; with the scientific explorations and topographic mapping activities done in the 300-plus years that followed, only about 30% of the land got mapped. But things have been changed greatly since the beginning of the century, when the air planes were put into use for mapping: up to 1950’s, the mapped areas had gone up to 70%; From 1957, a series of resource and environment satellites have been launched one after another,observing the globe, giving coverage of it and providing endlessly varieties of information about the seas and the lands day and night. 展开更多
关键词 China takes an active part in Activities of the International Space Year OBSERVING THE ENTIRE GLOBE FOR THE GOOD OF THE MANKIND
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The Active Participation of ASIAA in the SMA Project
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作者 Chi Yuan Institute of Astronomy and Astrophysics, Academia Sinica P.O. Box 1-87, Nankang, Taipei, Taiwan, China 《天文研究与技术》 CSCD 1999年第S1期11-17,共7页
This is a progress report of a major project that Institute of Astronomy & Astrophysics is actively engaged. The two 6m sub millimeter telescopes are being built in Taiwan. The construction of the antennas, which ... This is a progress report of a major project that Institute of Astronomy & Astrophysics is actively engaged. The two 6m sub millimeter telescopes are being built in Taiwan. The construction of the antennas, which has been contracted to Aeronautic Research Laboratory, has made good progress lately. The first reflector is completed. The mounts are also nearly finished. The antennas are expected to be completed and tested in late 1999. Our receiver lab has been built up from scratch. It is finishing the assembly of the first SMA receiver. It is also fabricating its first Nb AlO x Nb junction of 230 GHz. Our two telescopes are scheduled to join the two SAO telescopes presently at Mauna Kea in the spring of year 2000. 展开更多
关键词 The active participation of ASIAA in the SMA Project SMA
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Anomalous boundary deformation induced by enclosed active particles
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作者 田文得 顾燕 +1 位作者 郭永坤 陈康 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第10期82-88,共7页
We simulate a two-dimensional model of a round soft boundary enclosed with self-propelled particles. Persistent motion drives these particles to accumulate near the boundary, thereby dramatically deforming the boundar... We simulate a two-dimensional model of a round soft boundary enclosed with self-propelled particles. Persistent motion drives these particles to accumulate near the boundary, thereby dramatically deforming the boundary shape through collisions. Quantitative analyses of the boundary shape and the particle distribution show that there are two typical regimes in the variation of the morphology with the increase of self-propulsion of particles. One is under small forces, characterized by the radially inhomogeneous distribution of particles and the suppression of local fluctuations of the almost round boundary, and the other is under large forces, featured by the angularly inhomogeneous distribution of particles and the global shape deformation of the boundary. These two features are strongly cooperative. We also find different mechanisms in the particle relocation at low and high particle concentrations. 展开更多
关键词 self-propelled particles BOUNDARY active matter CONFINEMENT
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Distributed Active Partial Label Learning
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作者 Zhen Xu Weibin Chen 《Intelligent Automation & Soft Computing》 SCIE 2023年第9期2627-2650,共24页
Active learning(AL)trains a high-precision predictor model from small numbers of labeled data by iteratively annotating the most valuable data sample from an unlabeled data pool with a class label throughout the learn... Active learning(AL)trains a high-precision predictor model from small numbers of labeled data by iteratively annotating the most valuable data sample from an unlabeled data pool with a class label throughout the learning process.However,most current AL methods start with the premise that the labels queried at AL rounds must be free of ambiguity,which may be unrealistic in some real-world applications where only a set of candidate labels can be obtained for selected data.Besides,most of the existing AL algorithms only consider the case of centralized processing,which necessitates gathering together all the unlabeled data in one fusion center for selection.Considering that data are collected/stored at different nodes over a network in many real-world scenarios,distributed processing is chosen here.In this paper,the issue of distributed classification of partially labeled(PL)data obtained by a fully decentralized AL method is focused on,and a distributed active partial label learning(dAPLL)algorithm is proposed.Our proposed algorithm is composed of a fully decentralized sample selection strategy and a distributed partial label learning(PLL)algorithm.During the sample selection process,both the uncertainty and representativeness of the data are measured based on the global cluster centers obtained by a distributed clustering method,and the valuable samples are chosen in turn.Meanwhile,using the disambiguation-free strategy,a series of binary classification problems can be constructed,and the corresponding cost-sensitive classifiers can be cooperatively trained in a distributed manner.The experiment results conducted on several datasets demonstrate that the performance of the dAPLL algorithm is comparable to that of the corresponding centralized method and is superior to the existing active PLL(APLL)method in different parameter configurations.Besides,our proposed algorithm outperforms several current PLL methods using the random selection strategy,especially when only small amounts of data are selected to be assigned with the candidate labels. 展开更多
关键词 active learning partial label learning distributed processing disambiguation-free strategy
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Collective motion of active particles in environmental noise
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作者 陈秋实 季铭 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第9期565-570,共6页
We study the collective motion of active particles in environmental noise, where the environmental noise is caused by noise particles randomly diffusing in two-dimensional space. We show that active particles in a noi... We study the collective motion of active particles in environmental noise, where the environmental noise is caused by noise particles randomly diffusing in two-dimensional space. We show that active particles in a noisy environment can self organize into three typical phases: polar liquid, band, and disordered gas states. In our model, the transition between band and disordered gas states is discontinuous. Giant number fluctuation is observed in the polar liquid phase. We also compare our results with the Vicsek model and show that the interaction with noise particles can stabilize the band state to very low noise condition. This band structure could recruit most of the active particles in the system, which greatly enhances the coherence of the system. Our findings of complex collective behaviors in environmental noise help us to understand how individuals modify their self-organization by environmental factors, which may further contribute to improving the design of collective migration and navigation strategies. 展开更多
关键词 active matter soft matter self-organization
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An Empirical Study on Promoting Students’ Active Participation under“Task-based Teaching”in Adult ESL Classrooms
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作者 俞舒萌 《海外英语》 2019年第9期232-234,共3页
This paper focuses on a beginner adult ESL classroom aiming to enhance their participation under the guidance of“taskbased teaching”method. By incorporating three strategies of priming students to elicit their prior... This paper focuses on a beginner adult ESL classroom aiming to enhance their participation under the guidance of“taskbased teaching”method. By incorporating three strategies of priming students to elicit their prior knowledge on certain topic, designing a sequence of tasks to scaffold students for the final produce and modelling with lower level students to ensure their under? standing of task instructions, the activeness could see a significant increase. 展开更多
关键词 active participation student-center classroom PRIMING TASK-BASED TEACHING ESL TEACHING strategies
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Spontaneous unidirectional rotation of a symmetric gear driven by spherical active particles 被引量:1
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作者 Chao Wang Wenchao Lian +2 位作者 Huishu Li Wende Tian Kang Chen 《National Science Open》 2024年第4期41-53,共13页
Time reversal asymmetry and spatial anisotropy are considered two prerequisites for Brownian ratchet.An intriguing realization can be achieved by placing an asymmetric gear in the suspension of motile rod-like bacteri... Time reversal asymmetry and spatial anisotropy are considered two prerequisites for Brownian ratchet.An intriguing realization can be achieved by placing an asymmetric gear in the suspension of motile rod-like bacteria.Usually,alignment interactions caused by anisotropic collisions or hydrodynamics would boost the ratchet effect.Here,we are concerned with a perfectly isotropic system,i.e.,symmetric gear immersed in a bath of spherical active Brownian particles.We find that,under certain conditions,kinetic symmetry-breaking arises spontaneously,i.e.,the symmetric gear keeps rotating in one direction.Unexpectedly,such ratchet phenomenon does not rely on the direct many-particle interactions and moreover the introduction of alignment interaction would counterintuitively prevent it from happening!Further investigation reveals that such spontaneous symmetry-breaking phenomenon shares similarities with the equilibrium phase transition of the Ising model.Our results provide new insights and enhance our understanding of the fundamental aspects of active ratchet phenomena. 展开更多
关键词 ratchet effect spontaneous symmetry breaking active brownian particles ising model HYSTERESIS
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A Two-Layer Active Power Optimization and Coordinated Control for Regional Power Grid Partitioning to Promote Distributed Renewable Energy Consumption
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作者 Wentao Li Jiantao Liu +3 位作者 Yudun Li GuoxinMing Kaifeng Zhang Kun Yuan 《Energy Engineering》 EI 2024年第9期2479-2503,共25页
With the large-scale development and utilization of renewable energy,industrial flexible loads,as a kind of loadside resource with strong regulation ability,provide new opportunities for the research on renewable ener... With the large-scale development and utilization of renewable energy,industrial flexible loads,as a kind of loadside resource with strong regulation ability,provide new opportunities for the research on renewable energy consumption problem in power systems.This paper proposes a two-layer active power optimization model based on industrial flexible loads for power grid partitioning,aiming at improving the line over-limit problem caused by renewable energy consumption in power grids with high proportion of renewable energy,and achieving the safe,stable and economical operation of power grids.Firstly,according to the evaluation index of renewable energy consumption characteristics of line active power,the power grid is divided into several partitions,and the interzone tie lines are taken as the optimization objects.Then,on the basis of partitioning,a two-layer active power optimization model considering the power constraints of industrial flexible loads is established.The upper-layer model optimizes the planned power of the inter-zone tie lines under the constraint of the minimum peak-valley difference within a day;the lower-layer model optimizes the regional source-load dispatching plan of each resource in each partition under the constraint of theminimumoperation cost of the partition,so as to reduce the line overlimit phenomenon caused by renewable energy consumption and save the electricity cost of industrial flexible loads.Finally,through simulation experiments,it is verified that the proposed model can effectively mobilize industrial flexible loads to participate in power grid operation and improve the economic stability of power grid. 展开更多
关键词 Renewable energy consumption active power optimization power grid partitioning industrial flexible loads line over-limit
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Phase separation and super diffusion of binary mixtures of active and passive particles 被引量:1
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作者 Yan Wang Zhuanglin Shen +2 位作者 Yiqi Xia Guoqiang Feng Wende Tian 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第5期26-31,共6页
Computer simulations were performed to study the dense mixtures of passive particles and active particles in two dimensions.Two systems with different kinds of passive particles(e.g.,spherical particles and rod-like p... Computer simulations were performed to study the dense mixtures of passive particles and active particles in two dimensions.Two systems with different kinds of passive particles(e.g.,spherical particles and rod-like particles)were considered.At small active forces,the high-density and low-density regions emerge in both systems,indicating a phase separation.At higher active forces,the systems return to a homogeneous state with large fluctuation of particle area in contrast with the thermo-equilibrium state.Structurally,the rod-like particles accumulate loosely due to the shape anisotropy compared with the spherical particles at the high-density region.Moreover,there exists a positive correlation between Voronoi area and velocity of the particles.Additionally,a small number of active particles capably give rise to super-diffusion of passive particles in both systems when the self-propelled force is turned on. 展开更多
关键词 phase separation super diffusion active particles binary mixtures
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Nonequilibrium Dynamics of Chemically Active Particles
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作者 Huijun Jiang Zhonghuai Hou 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2022年第3期419-429,共11页
Chemically active motion is ubiquitous in many nature and artificial systems where each unit can move directionally by converting chemical energy into kinetic energy.Since the systems are driven by activity far from e... Chemically active motion is ubiquitous in many nature and artificial systems where each unit can move directionally by converting chemical energy into kinetic energy.Since the systems are driven by activity far from equilibrium,many dynamical behaviors forbidden in equilibrium systems may be induced.Nonequilibrium dynamics of such systems is then a hot multidisciplinary topic with great challenges.Here,we review our recent theoretical advances in some fundamental problems at the single active particle level,the collective behavior level,as well as in systems where active particles act as baths. 展开更多
关键词 Statistical mechanics Nonequilibrium processes KINETICS Chemically active particle Multiscale modeling
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Women and the Environment: Declaration Encourages Active Participation
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作者 JANE SHAW 《Women of China》 1994年第11期32-34,共3页
JUNE 5, 1994 has been mandated World Environment Day. On this day the first meeting on Women and the Environment in China was held in Beijing and the Declaration of Chinese Women on Environment was established. Accord... JUNE 5, 1994 has been mandated World Environment Day. On this day the first meeting on Women and the Environment in China was held in Beijing and the Declaration of Chinese Women on Environment was established. According to the declaration, environmental pollution and the destruction of the ecology have posed a serious threat to the survival of the human race. It has become a great issue of common concern. The functions of women in procreation and social development are directly affected by the deterioration of the environment. It is the common interest of the populations of the world to protect the environment. The declaration notes that Chinese women are greatly concerned about the environmental conditions of 展开更多
关键词 Declaration Encourages active participation Women and the Environment
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MOTIVATING STUDENTS TO BE ACTIVE PARTICIPANTS IN CLASS
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作者 Jiang Xianju Chongqing Teacher’s College, Sichuan 《Chinese Journal of Applied Linguistics》 1994年第0期143-144,共2页
Introduction In China, it is not uncommon for students to be treated as passive recipients in class. They are trained in this way from primary school. So by the time they enter college, not only are they accustomed to... Introduction In China, it is not uncommon for students to be treated as passive recipients in class. They are trained in this way from primary school. So by the time they enter college, not only are they accustomed to the role of submissive student following the lead of a dominant teacher, but they also quite welcome it, for they don’t have to take any initiative in class, they just wait to be filled with knowledge. Students’ hesitancy to participate actively in class comes not just from students themselves but also from some teachers, who stick to the force-feeding method because it is an easy way for them to conduct a class. So I started to try and change this situation. I designed a teaching plan in which I used different techniques to provide the students with lots of opportunities to be active participants in class. Some of the techniques used are described below. 展开更多
关键词 BE MOTIVATING STUDENTS TO BE active partICIPANTS IN CLASS
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“ACTIVE”英语学科育人模式构建与应用
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作者 庞晖 杨璐 《现代教育》 2024年第12期22-27,共6页
本研究以“立德树人”为核心理念,构建“ACTIVE”英语学科育人模式。该模式通过六个关键维度--学科育人(AIM)、文化浸润(Culture)、思维可见(Thinking)、技术融合(Integration)、美德根植(Virtue)和情感共鸣(Empathy)--全面激发学生英... 本研究以“立德树人”为核心理念,构建“ACTIVE”英语学科育人模式。该模式通过六个关键维度--学科育人(AIM)、文化浸润(Culture)、思维可见(Thinking)、技术融合(Integration)、美德根植(Virtue)和情感共鸣(Empathy)--全面激发学生英语学习的热情,培养他们的语言能力,同时注重道德品质的熏陶和文化素养的提升,促进英语学科素养落地。本研究不仅为英语教学实践提供了新的视角,也为其他学科育人模式的构建提供了有益的参考和借鉴。 展开更多
关键词 英语教学 学科育人 active 育人模式
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