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Friction 2024年第8期12卷 1897-1908页

作者： kewei tang Weihong QI Guoliang RU Weimin LIU State Key Laboratory of Solidification Processing and Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical UniversityXi’an 710072China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Two-dimensional materials are excellent lubricants with inherent ***,superlubricity has been reported for only a few of these ***,other promising two-dimentional(2D)materials with different physical properties cannot be discovered or applied in production;thus,energy consumption can be greatly ***,we carry out high-throughput calculations for 1,4752D materials and screen for low-friction *** set a standard,we propose,for the first time,a geometry-independent lubricating figure of merit based on the conditions for stick-slip transition and our theory of Moiré*** the efficient calculation of this figure of merit,an innovative approach was developed based on an improved registry index *** calculations,340 materials were found to have a figure of merit lower than 10−***,a small set of 21 materials with a figure of merit lower than 10−4 were screened *** materials can provide diverse choices for various *** addition,the efficient computational approach demonstrated in this work can be used to study other stacking-dependent properties.

关键词： two-dimensional materials high-throughput calculation tribology low-friction materials Moirépatterns

High-Throughput Calculation of Interlayer van der Waals Forces Validated with Experimental Measurements

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Research 2022年第3期2022卷 225-235页

作者： kewei tang Weihong Qi Yaru Wei Guoliang Ru Weimin Liu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Interlayer van der Waals interactions play an important role in two-dimensional(2D)materials on various *** interlayer binding force is often directly measured and is considered more closely related to the exfoliation ***,a binding force database from accurate theoretical calculations does not yet *** this work,the critical interlayer binding force and energy are directly calculated for 2302D materials,which exhibit divergent trends.A linear relationship that links the two quantities with the equilibrium interlayer distance is found and *** are carried out for three different materials using atomic force *** measured forces show a consistent trend with the calculated results,and the estimated binding strengths are of the same order of magnitude as the predicted *** work can provide a reliable reference for interlayer adhesion studies and help establish accurate models of exfoliation processes.

关键词： interlayer checked quantities

Unsupervised, Supervised and Semi-supervised Dimensionality Reduction by Low-Rank Regression Analysis

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Chinese Journal of Electronics 2021年第4期30卷 603-610页

作者： tang kewei ZHANG Jun ZHANG Changsheng WANG Lijun ZHAI Yun JIANG Wei School of Mathematics Liaoning Normal University College of Computer Science and Artificial Intelligence Wenzhou University Research Center for Information Science Theory and Methodology Institute of Scientific and Technical Information of China E-Government Research Center Chinese Academy of Governance

Techniques for dimensionality reduction have attracted much attention in computer vision and pattern recognition. However, for the supervised or unsupervised case, the methods combining regression analysis and spectral graph analysis do not consider the global structure of the subspace; For semi-supervised case,how to use the unlabeled samples more effectively is still an open problem. In this paper, we propose the methods by Low-rank regression analysis(LRRA) to deal with these problems. For supervised or unsupervised dimensionality reduction, combining spectral graph analysis and LRRA can make a global constraint on the subspace. For semi-supervised dimensionality reduction, the proposed method incorporating LRRA can exploit the unlabeled samples more effectively. The experimental results show the effectiveness of our methods.

关键词： Dimensionality reduction Low-rank Supervised Unsupervised Semi-supervised

A High-Performance MoS_(2)-Based Visible-Near-Infrared Photodetector from Gateless Photogating Effect Induced by Nickel Nanoparticles

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Research 2024年第2期6卷 171-179页

作者： Ran Duan Weihong Qi Panke Li kewei tang Guoliang Ru Weimin Liu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Recent advancements in two-dimensional materials have shown huge potential for optoelectronic *** is challenging to achieve highly effective and sensitive broadband photodetection based on MoS_(2)*** engineering,such as introducing vacancies,can narrow the bandgap and boost the separation of photogenerated carriers by defect states but leads to a slow response ***,we propose a nickel nanoparticle-induced gateless photogating effect with a unique energy band structure to enable the application of defect engineering and achieve high optoelectronic *** device based on Ni nanoparticle-decorated MoS_(2)with S vacancies exhibited high responsivities of 106.21 and 1.38 A W^(-1)and detectivities of 1.9×10^(12)and 8.9×10^(9)Jones under 532 and 980 nm illumination(visible to near infrared),respectively,with highly accelerated response *** strategy provides new insight into optimizing defect engineering to design high-performance optoelectronic devices capable of broadband photodetection.

关键词： defect Infrared illumination

Robust Semi-nonnegative Matrix Factorization with Adaptive Graph Regularization for Gene Representation

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Chinese Journal of Electronics 2020年第1期29卷 122-131页

作者： JIANG Wei MA Tingting FENG Xiaoting ZHAI Yun tang kewei ZHANG Jie School of Mathematics Liaoning Normal University E-Government Research Center Chinese Academy of Governance

Various data representation algorithms have been proposed for gene expression. There are some shortcomings in traditional gene expression methods,such as learning the ideal affinity matrix to effectively capture the geometric structure of genetic data space,and reducing noises and outliers influences of data *** propose a novel matrix factorization algorithm called Robust semi-nonnegative matrix factorization(RSNMF)with adaptive graph regularization, which simultaneously performs matrix robust factorization with learning affinity matrix in a unified optimization framework. RSNMF also uses a loss function based on ?2,1-norm to improve the robustness of the model against noises and outliers.A novel Augmented Lagrange multiplier(ALM) is designed to obtain the optimal solution of RSNMF. The results of extensive experiments that were performed on gene expression datasets demonstrate that RSNMF outperforms the other algorithms, which validates the effectiveness and robustness of RSNMF.

关键词： Adaptive graph Matrix factorization Robustness

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工程多维集成管理研究现状分析及其技术实现

同济大学学报（自然科学版） 2007年第9期35卷 1289-1294页

作者：陈建国唐可为同济大学经济与管理学院上海200092

对国内外建筑工程多维集成管理的研究进行回顾和总结,对研究现状进行分析.目前,建筑工程多维集成管理的研究主要集中在产品建模和可视化、过程建模和分析及协作和交流等方向,研究的基础是建筑工程生命期内信息的创建,研究核心是信息的... 详细信息

对国内外建筑工程多维集成管理的研究进行回顾和总结,对研究现状进行分析.目前,建筑工程多维集成管理的研究主要集中在产品建模和可视化、过程建模和分析及协作和交流等方向,研究的基础是建筑工程生命期内信息的创建,研究核心是信息的管理和共享过程,研究所需解决的关键问题是揭示其理论机理及其模型构建.在此基础上提出未来工程多维集成管理技术实现的方法,基于参数化建筑工程数据模型建立的可计算的信息、协同数据标准和标准商业模式成为解决方案的研究重心.

关键词：多维集成管理研究现状关键问题技术实现

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大型机场航站楼的建造总工期估算

同济大学学报（自然科学版） 2017年第7期45卷 1091-1098页

作者：贾广社牟强唐可为同济大学经济与管理学院上海200092

从对国内10多个大型机场的进度总控咨询成果数据分析(2000—2016年),提出基于总控工序的航站楼总工期估算模型.确定航站楼典型关键线路的总控工序顺序,并拟合出工序间的未搭接时间分布.在对4条可能关键线路进行工期分布拟合的基础上,提... 详细信息

从对国内10多个大型机场的进度总控咨询成果数据分析(2000—2016年),提出基于总控工序的航站楼总工期估算模型.确定航站楼典型关键线路的总控工序顺序,并拟合出工序间的未搭接时间分布.在对4条可能关键线路进行工期分布拟合的基础上,提出建造总工期的估算模型,并应用到3个已完工航站楼的案例中,验证了估算方法的可靠性.通过引入总控工序的工期估算模型,简化了应用传统风险计划方法评估大型工程工期的繁复工作.

关键词：大型工程工期估算总控工序蒙特卡洛方法

ANALYTICAL SOLUTION FOR AXISYMMETRIC PROBLEM OF THICK LAMINATED CLOSED CANTILEVER SHELIS IN HAMILTON SYSTEM

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Acta Mechanica Solida Sinica 1998年第2期11卷 146-158页

作者： Ding kewei tang Limin (Dept.of Engineering Mechanics,Dalian University of Technology,Dalian 116023,China)Fan Jiarang (Dept.of Civil Engineering,He fei University of Technology,Hefei 230009,China) Dept. of Engineering Mechanics Dalian University of Technology Dalian 116023 China Dept. of Civil Engineering Hefei University of Technology Hefei 230009 China

By giving up any assumptions about displacement models and stress distribution,the mixed state Hamilton equation for the axisymmetric problem of the thick laminated closed cantilever cylindrical shells is *** identical analytical solution is obtained for the thin,moderately thick and thick laminated closed cantilever cylindrical *** equations of elasticity can be satis- fied,and all elastic constants can be taken into account.

关键词： Hamilton canonical equation state equation cantilever cylindrical shell exact analysis

基于设计结构矩阵的大型复杂机场项目前期进度优化

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同济大学学报（自然科学版） 2020年第10期48卷 1523-1529页

作者：乐云孙乔陈建国唐可为同济大学经济与管理学院上海200092

大型复杂机场项目前期阶段通常会存在任务复杂繁多且耗时较长的进度管理问题,针对这些问题,提出了前期工作管理思路,通过识别开工路径和建立前期工作概念模型梳理前期工作内容来确定关键工序。在此基础上,引入活动重叠思想,利用三元参... 详细信息

大型复杂机场项目前期阶段通常会存在任务复杂繁多且耗时较长的进度管理问题,针对这些问题,提出了前期工作管理思路,通过识别开工路径和建立前期工作概念模型梳理前期工作内容来确定关键工序。在此基础上,引入活动重叠思想,利用三元参数组建立基于设计结构矩阵(DSM)的工期计算模型,将关键工序导入到模型中,通过算法确定工序逻辑关系和缩短项目前期工作周期。以某机场项目为实例,将DSM矩阵有效地应用在项目前期进度管控中,为大型机场项目进度管理提供借鉴和指导。

关键词：机场项目前期设计结构矩阵活动重叠进度优化

核结构限制的低秩表示及其在流形聚类上的应用

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计算机辅助设计与图形学学报 2019年第4期31卷 589-595页

作者：唐科威由月苏志勋姜伟张杰辽宁师范大学数学学院大连116029 大连理工大学数学科学学院大连116023

针对很多计算机视觉问题中的数据往往具有混合多流形结构,提出一种流形聚类方法.通过对2,1范数采用一种特殊的迭代格式,将结构限制的低秩表示方法进行了核化,解决了其核化存在的技术难题.在Hopkins155和Caltech 256等数据集上的实验结... 详细信息

针对很多计算机视觉问题中的数据往往具有混合多流形结构,提出一种流形聚类方法.通过对2,1范数采用一种特殊的迭代格式,将结构限制的低秩表示方法进行了核化,解决了其核化存在的技术难题.在Hopkins155和Caltech 256等数据集上的实验结果表明,核结构限制低秩表示是一个有效的流形聚类方法.

关键词：核方法结构限制低秩表示流形聚类 2,1范数