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Green tribology:Fundamentals and future development

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Friction 2013年第2期1卷 186-194页

作者： si-wei ZHANG School of Mechanical and Storage and Transportation Engineering China University of Petroleum20 Xueyuan RdPO Box 902Beijing 100083China

As green tribology is a new field of tribology still in its infancy,understanding its fundamentals is essential for its further *** this article,a brief historical retrospective on the emergence of green tribology is introduced first,and then the definition,objectives,and disciplinary features of green tribology are *** particular,the technological connotations of green tribology are expounded ***,the developing directions of this new area are *** findings may contribute to laying the foundation of further advancement in green tribology.

关键词： green tribology technological connotations environmental impact biological impact developing directions

Properties of collective flow and pion production in intermediate-energy heavy-ion collisions with a relativistic quantum molecular dynamics model

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Nuclear Science and Techniques 2024年第1期35卷 155-169页

作者： si-Na wei Zhao-Qing Feng School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China

The relativistic mean-field approach was implemented in the Lanzhou quantum molecular dynamics transport model(***). Using the ***, the properties of collective flow and pion production were investigated systematically for nuclear reactions with various isospin asymmetries. The directed and elliptic flows of the *** are able to describe the experimental data of STAR Collaboration. The directed flow difference between free neutrons and protons was associated with the stiffness of the symmetry energy, that is, a softer symmetry energy led to a larger flow difference. For various collision energies, the ratio between the π^(-) and π^(+) yields increased with a decrease in the slope parameter of the symmetry energy. When the collision energy was 270 MeV/nucleon, the single ratio of the pion transverse momentum spectra also increased with decreasing slope parameter of the symmetry energy in both nearly symmetric and neutron-rich ***, it is difficult to constrain the stiffness of the symmetry energy with the double ratio because of the lack of threshold energy correction on the pion production.

关键词： Heavy-ion collision Collective flow Pion production Symmetry energy Relativistic mean field

成渝地区双城经济圈旅游共生水平测度及协同发展研究

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四川师范大学学报（自然科学版） 2025年第1期48卷 94-104页

作者：司嵬樊丹王冲四川旅游学院旅游文化产业学院四川成都610100 四川旅游学院大数据与统计学院四川成都610100 四川旅游学院文旅融合发展研究中心四川成都610100

基于共生理论和社会网络分析,从成渝地区旅游同质度、关联度、外向功能强度3个维度测评并分析成渝地区双城经济圈旅游业共生水平现状.通过分析得出:成渝地区双城经济圈旅游业的同质度和重合度均较高,成都市、重庆主城区、渝西毗邻片区3... 详细信息

基于共生理论和社会网络分析,从成渝地区旅游同质度、关联度、外向功能强度3个维度测评并分析成渝地区双城经济圈旅游业共生水平现状.通过分析得出:成渝地区双城经济圈旅游业的同质度和重合度均较高,成都市、重庆主城区、渝西毗邻片区3个片区处于成渝双城经济圈旅游共生的中心主导地位,成都是连接四川省其他地区和重庆片区的桥梁.广安市、达州市、资阳市与重庆地区虽联系较多,但是外向功能强度不高,还未发挥出旅游的带动和桥梁作用.成渝地区双城经济圈中旅游关系存在4个子群,重庆地区与川南地区子群具有较强的影响力,川东北与重庆毗邻地区是最具潜力子群.据此,从建立分工基础上的对称互惠一体化共生模式、营造良好的旅游市场一体化共生环境、打破行政区划创造多元旅游共生界面3个方面提出成渝地区双城经济圈旅游共生发展的对策建议.

关键词：成渝双城经济圈旅游共生社会网络分析区域协同

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The Thickness of Some Complete Bipartite and Tripartite Graphs

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Acta Mathematicae Applicatae sinica 2024年第4期40卷 1001-1014页

作者： si-wei HU Yi-chao CHEN Yali Peicui School Changsha 410021China School of Mathematics Suzhou University of Science and TechnologySuzhou 215009China

In this paper,we obtain the thickness for some complete k-partite graphs for k=2,*** first compute the thickness of K_(n,n+8)by giving a planar decomposition of K_(4k-1,4k+7)for k≥***,two planar decompositions for K_(1,g,g)(g-1)when g is even and for K^(1,g,1/2(g-1)2)when g is odd are *** a recursive construction,we also obtain the thickness for some complete tripartite *** results here support the long-standing conjecture that the thickness of K_(m,n)is[mn/2(m+n-2)]for any positive integers m,n.

关键词： thickness complete bipartite graph complete tripartite graph planar decomposition

Glass capillary nanopore for single molecule detection

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Science China(Technological Sciences) 2015年第5期58卷 803-812页

作者： SHA JingJie si wei XU wei ZOU YiRen CHEN YunFei Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast University School of Mechanical Engineering Southeast University

single molecule detection based on nanopore technology is a very promising approach for medical diagnostics, drug therapy and even DNA sequencing. Compared with other biological nanopores and solid-state nanopores, the glass capillary nanopore has low cost, easy availability and stable mechanical characteristics, thus it has been widely used in the nanopore technology for single molecule detection. In this review, we will focus on the studies of the glass nanopore sensors. The popular glass nanopore fabrication methods would be introduced, and the applications of glass nanopores in the detection of nanoparticles, proteins and DNA molecules would be presented. We hope this review will help widen field of vision and promote the development of the nanopore technology based on the glass capillary nanopores.

关键词： fabrication capillary nanotubes sequencing diameters SWNTs DNA etching diagnostics nanometer

Measuring the beaming angle of GRB 030329 by fitting the rebrightenings in its multiband afterglow

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Research in Astronomy and Astrophysics 2010年第11期10卷 1119-1126页

作者： wei Deng Yong-Feng Huang si-wei Kong Department of Astronomy Nanjing University Nanjing 210093 China Key Laboratory of Modern Astronomy and Astrophysics （Nanjing Univ.） Ministry of EducationNanjing 210093 China

Multiple rebrightenings have been observed in the multiband afterglow of GRB 030329. In particular, a marked and quick rebrightening occurred at about t 1.2 × 10^5 s. Energy injection from late and slow shells seems to be the best interpretation for these rebrightenings. Usually it is assumed that the energy is injected into the whole external shock. However, in the case of GRB 030329, the rebrightenings are so quick that the usual consideration fails to give a satisfactory fit to the observed light curves. Actually, since these late/slow shells freely coast in the wake of the external shock, they should be cold and may not expand laterally. The energy injection then should only occur at the central region of the external shock. Considering this effect, we numerically re-fit the quick rebrightenings observed in GRB 030329. By doing this, we were able to derive the beaming angle of the energy injection process. Our result, with a relative residual of only 5% - 10% during the major rebrightening, is bet- ter than any previous modeling. The derived energy injection angle is about 0.035. We assume that these late shells are ejected by the central engine via the same mechanism as those early shells that produce the prompt gamma-ray burst. The main difference is that their velocities are much slower, so that they catch up with the external shock relatively late and are manifested as the observed quick rebrightenings. If this were true, then the derived energy injection angle can give a good measure of the beaming angle of the prompt γ-ray emission. Our study may hopefully provide a novel method to measure the beaming angle of gamma-ray bursts.

关键词： gamma-rays bursts-ISM jets and outflows

Prediction of the Charpy V-notch impact energy of low carbon steel using a shallow neural network and deep learning

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International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1309-1320页

作者： si-wei Wu Jian Yang Guang-ming Cao State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

The impact energy prediction model of low carbon steel was investigated based on industrial data. A three-layer neural network, extreme learning machine, and deep neural network were compared with different activation functions, structure parameters, and training functions. Bayesian optimization was used to determine the optimal hyper-parameters of the deep neural network. The model with the best performance was applied to investigate the importance of process parameter variables on the impact energy of low carbon steel. The results show that the deep neural network obtains better prediction results than those of a shallow neural network because of the multiple hidden layers improving the learning ability of the model. Among the models, the Bayesian optimization deep neural network achieves the highest correlation coefficient of 0.9536, the lowest mean absolute relative error of 0.0843, and the lowest root mean square error of 17.34 J for predicting the impact energy of low carbon steel. Among the variables, the main factors affecting the impact energy of low carbon steel with a final thickness of7.5 mm are the thickness of the original slab, the thickness of intermediate slab, and the rough rolling exit temperature from the specific hot rolling production line.

关键词： prediction shallow neural network deep neural network impact energy low carbon steel

Structural Manipulation of Aminal-crosslinked Polybutadiene for Recyclable and Healable Elastomers

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Chinese Journal of Polymer Science 2021年第10期39卷 1337-1344,I0008页

作者： Zheng-Hai Tang Hui Zeng si-Qi wei si-Wu Wu Bao-Chun Guo Department of Polymer Materials and Engineering South China University of TechnologyGuangzhou 510640China

Recently,increasingly growing efforts have been devoted to incorporating dynamic covalent bonds into covalently crosslinked networks to address the persistent trade-offs between chemical crosslinking and ***,a series of dynamic aminal bond crosslinked polybutadiene rubbers(PAPB)are prepared by crosslinking aldehyde group-terminated polybutadiene rubber(APB)with *** varying the molecular weight of APB,the crosslinking density of PAPB is changed,which offers the platform to regulate the mechanical characteristics and dynamic ***,with the decrease of APB molecular weight,*** the increase of crosslinking density,the modulus of PAPB gradually increases while the elongation at break conversely decreases,and the activation energy for network rearrangement initially decreases and then *** resultant PAPB exhibit vitrimer-like behaviors that can alter the network topologies at elevated temperatures without the loss of structural integrity through dissociative aminal exchange reactions,while the protic source can accelerate aminal dissociation and result in network dissolution even at room *** to the aminal exchange,PAPB are thermally malleable and can almost restore the original mechanical characteristics after recycling;besides,they are capable of healing at a relatively low crosslinking density.

关键词： Aminal Recyclability Healing Structural manipulation Dynamic covalent network

TRIPLET combined with microwave ablation:A novel treatment for advanced hepatocellular carcinoma

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World Journal of Gastrointestinal Oncology 2025年第1期17卷 10-12页

作者： Fei-Yu Zhao Guo-wei si Nian-Song Qian Department of Thoracic Oncology Respiratory and Critical Care MedicineThe Eighth Medical Center of People’s Liberation Army General HospitalBeijing 100853China Department of Gastroenterology Fourth Medical CentreGeneral Hospital of the People's Liberation ArmyBeijing 100142China Senior Department of Thoracic Oncology Respiratory and Critical Care MedicineThe Eighth Medical Center of People’s Liberation Army General HospitalBeijing 100091China

This editorial comments on a study by Zuo et *** focus is on the efficacy of he-patic arterial infusion chemotherapy combined with camrelizumab and apatinib(the TRIPLET regimen),alongside microwave ablation therapy,in treating advanced hepatocellular carcinoma(HCC).The potential application of this combination therapy for patients with advanced HCC is evaluated.

关键词： Microwave ablation Hepatic arterial infusion chemotherapy Apatinib Camrelizumab Hepatocellular carcinoma