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Breakdown of Energy Equipartition in Vibro-Fluidized Granular Media in Micro-Gravity

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Chinese Physics Letters 2012年第7期29卷 160-163页

作者： CHEN Yan-Pei Pierre Evesque hou mei-ying Key Laboratory of Soft Matter Physics Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190 Lab MSSMat Ecole Centrale de ParisUMR 8579 CNRS92295 Châtenay-Malabry CedexFrance

We present a micro-gravity experimental study of intermediate number density vibro-fluidized inelastic spheres in a rectangular *** velocity distributions are investigated,and are found to deviate measurably from a symmetric distribution for the velocity component of the vibrating direction when dividing particles along the vibration direction into several *** feature does not exist in the molecular *** further study the hydrodynamic profiles of pressures p and temperatures T in positive and negative components,such as p+y and p-y and T+y and T-y,in accordance with the sign of velocity components of the vibrating *** vibration direction,granular media are found to be not only inhomogeneous and anisotropic,but also different greatly in positive and negative *** equipartition breaks down in this case.

关键词： partition vibrating dividing

Directed segregation in compartmentalized bi-disperse granular gas

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Chinese Physics B 2012年第1期21卷 284-288页

作者： Sajjad Hussain Shah Li Yin-Chang Cui Fei-Fei Zhang Qi hou mei-ying Physics Department Beijing Institute of TechnologyBeijing 100081China Institute of Physics Chinese Academy of SciencesBeijing 100190China

A bi-disperse granular gas in an asymmetrical two-compartment system is studied experimentally. The presence of asymmetry within the range of our experimental parameters results in a directed segregated state and a directed clustering state. This deterministic system does not depend on the initial conditions. A modified flux model based on Lohse＇s flux model for bi-disperse granular gases is derived. The modified flux model explains qualitatively the experimental results.

关键词： granular matter segregation nonlinear dynamics

Irregular Oscillation of Bi-disperse Granular Gas in Cyclic Three Compartments

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Chinese Physics Letters 2012年第3期29卷 128-131页

作者： Sajjad Hussain Shah LI Yin-Chang CUI Fei-Fei ZHANG Qi Pierre Evesque hou mei-ying Department of Physics Beijing Institute of TechnologyBeijing 100081 Institute of Physics Chinese Academy of SciencesBeijing 100190 Lab MSSMat EcoleCentrale de Paris92295 Châtenay-MalabryFrance

A 3-D molecular dynamics simulation of a bi-disperse vibro-fluidized granular gas in a cyclic three-compartment cell is performed.A cluster of particles is randomly found in one of the ***'s flux model is modified to incorporate inelastic particle-boundary *** model predicts that periodically there is clustering in each *** is then found that if the model is further modified to incorporate Gaussian white noise,it correctly predicts the non-sequential clustering behavior confirming that there is no chaotic behavior.

关键词： behavior disperse incorporate

A comparative study of data-driven battery capacity estimation based on partial charging curves

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Journal of Energy Chemistry 2024年第1期88卷 409-420,I0010页

作者： Chuanping Lin Jun Xu Delong Jiang Jiayang hou ying Liang Xianggong Zhang Enhu Li Xuesong mei State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Shaanxi Key Laboratory of Intelligent Robots School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Department of Electrical Engineering and Automation Luoyang Institute of Science and TechnologyLuoyang 471023HenanChina Wuhan Institute of Marine Electric Propulsion China State Shipbuilding Corporation LimitedWuhan 430064HubeiChina Gresgying Digital Technology Ltd. Xi’an 710086ShaanxiChina

With its generality and practicality, the combination of partial charging curves and machine learning(ML) for battery capacity estimation has attracted widespread attention. However, a clear classification,fair comparison, and performance rationalization of these methods are lacking, due to the scattered existing studies. To address these issues, we develop 20 capacity estimation methods from three perspectives:charging sequence construction, input forms, and ML models. 22,582 charging curves are generated from 44 cells with different battery chemistry and operating conditions to validate the performance. Through comprehensive and unbiased comparison, the long short-term memory(LSTM) based neural network exhibits the best accuracy and robustness. Across all 6503 tested samples, the mean absolute percentage error(MAPE) for capacity estimation using LSTM is 0.61%, with a maximum error of only 3.94%. Even with the addition of 3 m V voltage noise or the extension of sampling intervals to 60 s, the average MAPE remains below 2%. Furthermore, the charging sequences are provided with physical explanations related to battery degradation to enhance confidence in their application. Recommendations for using other competitive methods are also presented. This work provides valuable insights and guidance for estimating battery capacity based on partial charging curves.

关键词： Lithium-ion battery Partial charging curves Capacity estimation Data-driven Sampling frequency

Phylogenetic study on Scenedesmacae with the description of a new genus Coccoidesmus ***.(Chlorophyceae,Chlorophyta)and chloroplast genome analyses

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Journal of Oceanology and Limnology 2024年第4期42卷 1272-1285页

作者： Qinghua WANG ying hou Yanhui LI ying SHI Guoxiang LIU College of Biological Sciences and Technology Taiyuan Normal UniversityJinzhong 030619China Shanxi Vocational University of Engineering Science and Technology Jinzhong 030619China Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China

Members of the family Scenedesmaceae are some of the most common algal taxa in inland ecosystems,and they are widely distributed in freshwaters,aerial,and sub-aerial *** the continuous updating of methods,the classic morphological taxonomy of this family needs to be *** recent years,many genera of Scenedesmaceae have been established via the use of molecular *** phylogenetic relationships within Scenedesmaceae were analyzed using different molecular markers and morphological data,and the new freshwater genus Coccoidesmus Wang,hou et Liu *** *** new species in this genus were also *** analysis based on tufA genes revealed that the new genus formed an independent clade closely related to ***,these two genera are characterized by significant morphological differences in colony arrangement and cell *** chloroplast genome of the type species was assembled and annotated,and analyses of genome structure and sequences were *** genome data could help clarify the phylogenetic relationships within this family.

关键词： phylogenetic Scenedesmaceae Coccoidesmus morphology chloroplast genome

Hierarchical vectorization for facial images

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Computational Visual Media 2024年第1期10卷 97-118页

作者： Qian Fu Linlin Liu Fei hou ying He School of Computer Science and Engineering Nanyang Technological University639798SingaporeSingapore Data61 Commonwealth Scientific and Industrial Research OrganisationSydney2015Australia Interdisciplinary Graduate School Nanyang Technological University and Alibaba Group639798SingaporeSingapore State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

The explosive growth of social media means portrait editing and retouching are in high *** portraits are commonly captured and stored as raster images,editing raster images is non-trivial and requires the user to be highly *** at developing intuitive and easy-to-use portrait editing tools,we propose a novel vectorization method that can automatically convert raster images into a 3-tier hierarchical *** base layer consists of a set of sparse diffusion curves(DCs)which characterize salient geometric features and low-frequency colors,providing a means for semantic color transfer and facial expression *** middle level encodes specular highlights and shadows as large,editable Poisson regions(PRs)and allows the user to directly adjust illumination by tuning the strength and changing the shapes of *** top level contains two types of pixel-sized PRs for high-frequency residuals and fine details such as pimples and *** train a deep generative model that can produce high-frequency residuals *** to the inherent meaning in vector primitives,editing portraits becomes easy and *** particular,our method supports color transfer,facial expression editing,highlight and shadow editing,and automatic *** quantitatively evaluate the results,we extend the commonly used FLIP metric(which measures color and feature differences between two images)to consider *** new metric,illumination-sensitive FLIP,can effectively capture salient changes in color transfer results,and is more consistent with human perception than FLIP and other quality measures for portrait *** evaluate our method on the FFHQR dataset and show it to be effective for common portrait editing tasks,such as retouching,light editing,color transfer,and expression editing.

关键词： face editing vectorization Poisson editing color transfer illumination editing expression editing

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三维颗粒气体相分离现象

物理学报 2008年第8期57卷 4660-4666页

作者：刘锐李寅阊厚美瑛中国科学院物理研究所北京凝聚态物理国家实验室北京100190

颗粒体系是一类复杂的耗散体系.在颗粒气体中,耗散性质会使其内部形成局部的凝聚,类似于真实气体中亚稳分解形成的液滴,因此被认为是颗粒气液两相分离的过程.零重力环境下二维颗粒气体相分离现象已有成熟的流体静力学理论解释,将该理论... 详细信息

颗粒体系是一类复杂的耗散体系.在颗粒气体中,耗散性质会使其内部形成局部的凝聚,类似于真实气体中亚稳分解形成的液滴,因此被认为是颗粒气液两相分离的过程.零重力环境下二维颗粒气体相分离现象已有成熟的流体静力学理论解释,将该理论模型推广到三维情形,发现相分离现象依然存在且具有同样的不稳定性根源,通过理论计算给出了三维相分离发生的具体条件.同时,用分子动力学方法模拟检验了理论结果,并给出了三维颗粒气体相分离的新形貌.

关键词：颗粒气体耗散相分离分子动力学模拟

Degradation of Rhodamine B by MnFe-LDH/PMS/O_(3) three-phase catalytic system: performance, mechanism and ecotoxicity studies

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 111-127页

作者： ying Han ying Yang Weibao Liu Yilong hou Ce Wang Jiangwei Shang Xiuwen Cheng Key Laboratory of Pollutant Chemistry and Environmental Treatment College of Chemistry and Environmental ScienceYili Normal UniversityYining 835000China Key Laboratory for Environmental Pollution Prediction and Control of Gansu Province College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China

This study developed a novel MnFe-LDH/PMS/O3 three-phase catalytic system to degrade the organic dye RhB, which was used to address the drawbacks of persulfate oxidation and ozonation techniques. The structure, ionic and elemental composition, specific surface area, and magnetic properties of the LDHs were investigated using a variety of physicochemical characterization tools. The results showed that MnFe-LDH had a large specific surface area, a rich crystalline phase composition, and a functional group structure. The RhB degradation rate of MnFe-LDH/PMS/O3 was 0.34 min−1, which was much higher than that of other comparative systems. RhB could be completely degraded in 10 min after optimization and had a significant effect on TOC removal. The system was found to be effective over a wide pH range. Common anions were largely unaffected and humic acid acted as an inhibitor. At the same time, the system had generally effective degradation performance for different dyes. Combined with quenching experiments and EPR, it was found that SO4•−, •OH, O_(2)•−, and 1O_(2) all participated in the reaction, and •OH contributed more. The degradation pathway of RhB was derived by LC-MS, and the T.E.S.T. evaluation found that the toxicity of the intermediate product was significantly reduced. Finally, the stability and availability of LDHs were verified using cycling experiments and metal ion leaching. This work provides a theoretical basis and data support for the synergistic catalysis of PMS/O3 and the deep treatment of dye wastewater.

关键词： Rhodamine B Layered double hydroxides Peroxymonosulfate Ozonation

振动驱动颗粒气体体系的局域态本构关系的实验验证

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物理学报 2013年第16期62卷 234-239页

作者：陈延佩 Pierre Evesque 厚美瑛中科院物理研究所北京凝聚态物理国家重点实验室 Lab MSSMat Ecole Centrale Paris UMR 8579 CNRS Chatenay-Malabry Cedex 92295 France

对准二维、水平边界振动驱动的颗粒气体体系的流体力学参量进行了局域态本构关系的实验研究.实验观测结果与经典动力学理论预测进行了比较.由于颗粒气体空间分布的不均匀性,颗粒体系的整体本构关系不成立,有必要对局域态进行分析.局域... 详细信息

对准二维、水平边界振动驱动的颗粒气体体系的流体力学参量进行了局域态本构关系的实验研究.实验观测结果与经典动力学理论预测进行了比较.由于颗粒气体空间分布的不均匀性,颗粒体系的整体本构关系不成立,有必要对局域态进行分析.局域态本构关系是指颗粒系统的局域温度、局域压强和局域数密度之间的关系.通过颗粒速度的方向变化,可以得到颗粒的碰撞点.因此在计算压力张量的对角线项时,除了动力学部分之外,我们计入了颗粒碰撞的影响,得到了一个约为常数的压力张量迹,即颗粒压强的空间分布,与流体力学理论预测以及分子动力学模拟结果相符合;但是颗粒温度和数密度的空间分布,在振动的正反两个方向的分量出现差异,并且温度、压强和数密度之间的局域本构关系,无论在低密度或高密度区域,实验与理论预测在定性上一致,但定量上都有较大差别.因此经典流体力学理论在描述这样的体系时需加以修正.

关键词：颗粒气体态方程流体力学