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Accumulative deformation in railway track induced by high-speed traffic loading of the trains

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Earthquake Engineering and Engineering Vibration 2010年第3期9卷 319-326页

作者： Bian xuecheng Jiang Hongguang chen Yunmin Department of Civil Engineering MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University Hangzhou 310058 China

Prediction and control of the permanent settlement of a track caused by traffic loading from trains is crucial to high-speed railway design and maintenance. In this study, a unified prediction model of accumulative deformation of geomaterials used in railway construction subjected to cyclic loadings is introduced and calibrated using physical model testing. Based on this versatile model, a calculation approach to determine the track structure settlement under repeated loadings caused by the movement of the wheel axle of the train is proposed. Regression analysis on the physical model testing is adopted to determine the parameters involved in the computational approach. Comparison of model test data and computed results shows that the parameters obtained from the back-analysis are consistent throughout the various testing conditions, and the proposed calculation approach is capable of satisfactorily predicting the accumulative settlement of the railway roadbed and subgrade soil for various axle loads and loading cycles. A case study of a high-speed railway is performed to demonstrate the feasibility of the proposed approach in realistic engineering applications. The computation results from the settlement development of a roadbed and subgrade soil are presented and discussed.

关键词： cyclic loading aggregate clay accumulative settlement high-speed railway

A Multiplexing Algorithm of Multiple Elementary Streams Based on Virtual Buffer Control

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 625-630页

作者： YI Zhixiong ZOU xuecheng LIU Weizhong chen Weibing Department of Electronics Science and Technology Huazhong University of Science and Technology Wuhan 430074 HubeiChina

The paper presents a prototype of virtual decoder of the transport stream＇s system target decoder （T-STD）. By connecting the coding model and decoding model, and feeding the overflow of decoding buffer back to control coding, we have got a self-adaptive coding model, and propose an algorithm of muhiplexing multiple elementary streams to a transport stream based on the principle of virtual buffer controlling strategy. The transport stream （TS） which uses this method passes the test of software unzipping and set top-box （STB） playing, and all of the analyzing parameters which are detected by code analyzer accord with the standard of MPEG-2. Some problems that playing time becomes longer and mul tiple TS streaming can not be fit for all the players are also analyzed.

关键词： virtual buffer multiplexing algorithm STD model ES streaming

All-inorganic quantum-dot light-emitting-diodes with vertical nickel oxide nanosheets as hole transport layer

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Progress in Natural Science:Materials International 2016年第5期26卷 503-509页

作者： Jiahui Li Yuanlong Shao xuecheng chen Hongzhi Wang Yaogang Li Qinghong Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Cambridge Graphene Center (CGC) Department of Engineering University of Cambridge Engineering Research Centre of Advanced Glasses Manufacturing Technology Ministry of Education College of Materials Science and EngineeringDonghua University

All-inorganic quantum dot light emitting diodes(QLEDs) have gained great attention as a result of their high stability under oxygen-rich, humid and high current working conditions. In this work, we have fabricated an allinorganic QLED device(FTO/NiO/QDs/AZO/Ag) with sandwich-structure, wherein the inorganic metal oxides thin films of NiO and AZO were employed as hole and electron transport layers, respectively. The porous NiO layer with vertical lamellar nanosheets interconnected microstructure have been directly synthesized on the substrate of conductive FTO glass and increased the wettability of CdSe@ZnS QDs, which result in an enhancement of current transport performance of the QLED.

关键词： Inorganic material NiO nanosheets QLED

One-pot green mass production of hierarchically porous carbon via a recyclable salt-templating strategy

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Green Energy & Environment 2022年第4期7卷 818-828页

作者： Changde Ma Jiang Gong Shuang Zhao Xiaoguang Liu Xueying Mu Yanhui Wang xuecheng chen Tao Tang State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China University of Science and Technology of China Hefei230026China Key Laboratory for Material Chemistry of Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanChina Faculty of Chemical Technology and Engineering West Pomeranian University of TechnologyPiastow Ave.42Szczecin71-065Poland

Porous carbon materials have exhibited a series of promising applications in supercapacitors and other research fields,yet still confronting the complicated synthetic procedures and massive usage of toxic ***,we propose a green and one-pot method to produce heteroatomdoped hierarchical porous carbon materials in large-scale without any toxic reagents ***,the as-prepared nitrogen-doped porous carbon(NPC)displays a high specific surface area of 2018 m^(2)g^(-1)together with abundant heteroatom dopants(14.8 wt%O and 1.03 wt%N).The potassium carbonate template can be recycled via a simple rinsing and re-precipitation ***,the as-prepared nitrogen-doped porous carbon delivers a high specific capacitance of 361 F g^(-1)at 0.5 A g^(-1)and excellent rate capability of 240 F g^(-1)at 20 A g^(-1)(66.5%capacitance retention).Finally,considering the low-price raw materials and facile green synthesis procedure,the present approach can be easily scalable to prepare biomass-derived heteroatoms doped porous carbon,which is not only applicable for supercapacitor but also for other research fields.

关键词： Porous carbon Supercapacitors Green Salt template Recyclable

Facile synthesis of accordion-like porous carbon from waste PET bottles-based MIL-53(Al)and its application for high-performance Zn-ion capacitor

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Green Energy & Environment 2024年第7期9卷 1138-1150页

作者： Jiaxin Li Shuai Zhang Yumeng Hua Yichao Lin Xin Wen Ewa Mijowska Tao Tang xuecheng chen Rodney S.Ruoff Faculty of Chemical Technology and Engineering West Pomeranian University of TechnologyPiastow Ave.4271-065SzczecinPoland Key State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China School of Safety Engineering China University of Mining and TechnologyXuzhou221116China Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdao266042China Institute for Basic Science Center for Multiple Dimensional Carbon Materials Ulsan44919Republic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Department of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea

It is of great scientific and economic value to recycle waste poly(ethylene terephthalate)(PET)into high-value PET-based metal organic frameworks(MOFs)and further convert it into porous carbon for green energy storage *** the present study,a facile and costeffective hydrothermal process was developed to direct recycle waste PET bottles into MIL-53(Al)with a 100% conversation,then the MOFderived porous carbon was assembled into electrodes for high-performance *** results indicated that the as-synthesized carbon exhibited high SSA of 1712 m^(2)g^(-1)and unique accordion-like structure with hierarchical *** to these advantageous characters,the assembled three-electrode supercapacitor displayed high specific capacitances of 391 F g^(-1)at the current density of 0.5 A g^(-1)and good rate capability of 73.6% capacitance retention at 20 A g^(-1)in 6 mol L^(-1)KOH ***,the assembled zinc ion capacitor still revealed outstanding capacitance of 335 F g^(-1)at 0.1 A g^(-1),excellent cycling stability of 92.2% capacitance retention after 10000 cycles and ultra-high energy density of 150.3 Wh kg^(-1)at power density of 90 W kg^(-1)in 3 mol L^(-1)ZnSO_(4)*** is believed that the current work provides a facile and effective strategy to recycle PET waste into high-valuable MOF,and further expands the applications of MOF-derived carbons for high-performance energy storage devices,so it is conducive to both pollution alleviation and sustainable economic development.

关键词： PET Recycling Porous carbon Supercapacitor Energy storage

Epithelial Cells in 2D and 3D Cultures Exhibit Large Differences in Higher-order Genomic Interactions

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Genomics, Proteomics & Bioinformatics 2022年第1期20卷 101-109页

作者： Xin Liu Qiu Sun Qi Wang Chuansheng Hu xuecheng chen Hua Li Daniel M.Czajkowsky Zhifeng Shao State Key Laboratory for Oncogenes and Bio-ID Center School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Center for Systems Biomedicine Shanghai Jiao Tong UniversityShanghai 200240China Translational Medical Center for Stem Cell Therapy&Institute for Regenerative Medicine Shanghai East HospitalSchool of Life Science and TechnologyShanghai Key Laboratory of Signaling and Disease ResearchTongji UniversityShanghai 200092China

Recent studies have characterized the genomic structures of many eukaryotic cells,often focusing on their relation to gene ***,these studies have largely investigated cells grown in 2D cultures,although the transcriptomes of 3D-cultured cells are generally closer to their in vivo *** examine the effects of spatial constraints on chromosome conformation,we investigated the genomic architecture of mouse hepatocytes grown in 2D and 3D cultures using in situ *** results reveal significant differences in higher-order genomic interactions,notably in compartment identity and strength as well as in topologically associating domain(TAD)-TAD interactions,but only minor differences are found at the TAD *** RNA-seq analysis reveals up-regulated expression of genes involved in physiological hepatocyte functions in the 3D-cultured *** genes are associated with a subset of structural changes,suggesting that differences in genomic structure are critically important for transcriptional ***,there are also many structural differences that are not directly associated with changes in gene expression,whose cause remains to be ***,our results indicate that growth in 3D significantly alters higher-order genomic interactions,which may be consequential for a subset of genes that are important for the physiological functioning of the cell.

关键词： 3D culture In situ Hi-C Chromosome conformation Compartment TAD

Recent advances of metal fluoride compounds cathode materials for lithium ion batteries:a review

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Materials Futures 2024年第3期3卷 1-27页

作者： Yanshen Gao Jiaxin Li Yumeng Hua Qingshan Yang Rudof Holze Ewa Mijowska Paul K Chu xuecheng chen Faculty of Chemical Technology and Engineering West Pomeranian University of TechnologySzczecinPiastów Ave.42Szczecin 71-065Poland Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong Kong Special Administrative Region of ChinaPeople’s Republic of China Chemnitz University of Technology Institut für ChemieAG Elektrochemie09107 ChemnitzGermany

As the most successful new energy storage device developed in recent decades,lithium-ion batteries(LIBs)are ubiquitous in the modern ***,current commercial LIBs comprising mainly intercalated cathode materials are limited by the theoretical energy density which cannot meet the high storing energy demanded by renewable *** to intercalation-type cathode materials,low-cost conversion-type cathode materials with a high theoretical specific capacity are expected to boost the overall energy of *** the different conversion cathode materials,metal fluorides have become a popular research subject for their environmental friendliness,low toxicity,wide voltage range,and high theoretical specific *** this review,we compare the energy storage performance of intercalation and conversion cathode materials based on thermodynamic calculation and summarize the main *** common conversion-type cathode materials are described and their respective reaction mechanisms are *** particular,the structural flaws and corresponding solutions and strategies are ***,we discussed the prospective of metal fluorides and other conversion cathode materials to guide further research in this important field.

关键词： lithium-ion batteries metal fluorides cathode materials conversion materials

Size-refinement enhanced flexibility and electrochemical performance of MXene electrodes for flexible waterproof supercapacitors

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Journal of Energy Chemistry 2021年第12期30卷 594-603,I0014页

作者： Jinkun Sun Yingjian Liu Jiayi Huang Jiatian Li Mengmeng chen Xiaoyu Hu Yatao Liu Run Wang Yanan Shen Jingjing Li xuecheng chen Dong Qian Baigang An Zunfeng Liu Key Laboratory of Functional Polymer Materials College of Chemistry and College of PharmacyState Key Laboratory of Medicinal Chemical BiologyFrontiers Science Center for New Organic MatterNankai UniversityTianjin 300071China School of Chemical Engineering University of Science and Technology LiaoningAnshan 114051LiaoningChina Department of Mechanical Engineering The University of Texas at DallasRichardsonTX 75080United States Nanomaterials Physicochemistry Department Faculty of Chemical Technology and EngineeringWest Pomeranian University of TechnologySzczecinPiastów Ave.4271-065 SzczecinPoland

Increasing mechanical flexibility without sacrificing electrochemical performance of the electrode material is highly desired in the design of flexible electrochemical energy storage *** metal-related materials science,decreasing the grain size introduces more grain boundaries;this stops dislocations and crack propagation under deformation,and results in increased strength and ***,such a size refinement effect has not been considered in the mechanical properties,particle stacking,wetting,and electrochemical performances of flexible supercapacitor *** this paper,MXene was used as an electrode material to study the size refinement effect of flexible *** refinement improved the strength and toughness of the MXene electrodes,and this resulted in increased *** elemental analysis provided a theoretical understanding of size refinement-increased ***,the size refinement also improved the specific surface area,electric conductance,ion transportation,and water wetting properties of the electrode,and the size refinement provided highly increased energy density and power density of the MXene supercapacitors.A highly flexible,water-proof supercapacitor was fabricated using size-refined *** current study provides a new viewpoint for designing tough and flexible energy storage *** size refinement effect may also be applicable for metal ion batteries and electronic and photo devices composed of MXene and other nanoparticles.

关键词： Grain refinement Flexible supercapacitor Size grading MXene

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用于学习和解释行人预期行为的群体交互场

Engineering 2024年第3期34卷 70-82页

作者： Xueyang Wang xuecheng chen Puhua Jiang Haozhe Lin Xiaoyun Yuan Mengqi Ji Yuchen Guo Ruqi Huang Lu Fang Sigma Laboratory Department of Electronic EngineeringTsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China Tsinghua Shenzhen International Graduate School Shenzhen 518055China Department of Automation Tsinghua UniversityBeijing 100084China Institute of Artificial Intelligence Beihang UniversityBeijing 100191China Zhejiang Future Technology Institute Yangtze Delta Region Institute of Tsinghua UniversityZhejiangJiaxing 314033China

Anticipating others’actions is innate and essential in order for humans to navigate and interact well with others in dense *** ability is urgently required for unmanned systems such as service robots and self-driving ***,existing solutions struggle to predict pedestrian anticipation accurately,because the influence of group-related social behaviors has not been well *** group relationships and group interactions are ubiquitous and significantly influence pedestrian anticipation,their influence is diverse and subtle,making it difficult to explicitly ***,we propose the group interaction field(GIF),a novel group-aware representation that quantifies pedestrian anticipation into a probability field of pedestrians’future locations and attention *** end-to-end neural network,GIFNet,is tailored to estimate the GIF from explicit multidimensional *** quantifies the influence of group behaviors by formulating a group interaction graph with propagation and graph attention that is adaptive to the group size and dynamic interaction *** experimental results show that the GIF effectively represents the change in pedestrians’anticipation under the prominent impact of group behaviors and accurately predicts pedestrians’future ***,the GIF contributes to explaining various predictions of pedestrians’behavior in different social *** proposed GIF will eventually be able to allow unmanned systems to work in a human-like manner and comply with social norms,thereby promoting harmonious human-machine relationships.

关键词： Human behavior modeling and prediction Implicit representation of pedestrian anticipation Group interaction Graph neural network