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Interface failure of segmental tunnel lining strengthened with steel plates based on fracture mechanics

Frontiers of Structural and Civil Engineering 2024年第1期18卷 137-149页

作者： Yazhen SUN Yang YU jinchang wang Longyan wang School of Transportation and Geomatics Engineering Shenyang Jianzhu UniversityShenyang 110168China School of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China Institute of Transportation Engineering Zhejiang UniversityHangzhou 310058China Center for Balance Architecture Zhejiang UniversityHangzhou310058China

Segmental tunnel lining strengthened with steel plates is widely used worldwide to provide a permanent strengthening *** existing studies assume an ideal steel-concrete interface,ignoring discontinuous deformation characteristics,making it difficult to accurately analyze the strengthened structure’s failure *** this study,interfacial fracture mechanics of composite material was applied to the segmental tunnel lining strengthened with steel plates,and a numerical three-dimensional solid nonlinear model of the lining structure was established,combining the extended finite element method with a cohesive-zone model to account for the discontinuous deformation characteristics of the *** results accurately describe the crack propagation process,and are verified by full-scale ***,dynamic simulations based on the calibrated model were conducted to analyze the sliding failure and cracking of the steel-concrete ***,detailed location of the interface bonding failure are further verified by model *** results show that,the cracking failure and bond failure of the interface are the decisive factors determining the instability and failure of the strengthened *** proposed numerical analysis is a major step forward in revealing the interface failure mechanism of strengthened composite material structures.

关键词： segmental tunnel lining steel plate strengthening connecting interface cohesive-zone model extended finite element method

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Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined loading considering different stratum features

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Frontiers of Structural and Civil Engineering 2023年第10期17卷 1517-1534页

作者： Xiaoqing ZHAO jinchang wang Panpan GUO Xiaonan GONG Yongle DUAN Research Center of Coastal and Urban Geotechnical Engineering Zhejiang UniversityHangzhou 310058China Institute of Transportation Engineering Zhejiang UniversityHangzhou 310058China College of Civil Engineering Hefei University of TechnologyHefei 230009China China North Industries Norengeo Ltd. Shijiazhuang 050051China

A novel anchorage for long-span suspension bridges,called pile-caisson composite structures,was recently proposed by the authors in an attempt to reduce the construction period and *** study aims to investigate the displacement and force behavior of piles in a pile-caisson composite structure under eccentric inclined loading considering different stratum *** this end,both 1g model tests and three-dimensional numerical simulations were *** groups of 1g model tests were used to validate the finite-element(FE)*** studies were then performed to investigate the effects of groundwater level,burial depth of the pile-caisson composite structure,and distribution of soil layers on the performance of the pile-caisson composite *** numerical analyses indicated that the influence of the groundwater level on the stability of the caisson was much greater than that of the *** addition,increasing the burial depth of the pile-caisson composite structure can assist in reducing the displacements and improving the stability of the pile-caisson composite *** addition,the distribution of soil layers can significantly affect the stability of the pile-caisson composite structure,especially the soil layer around the caisson.

关键词： composite structure piles foundation suspension bridge 1g model test finite-element analysis

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On the Limit of Machine Intelligence

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International Journal of Intelligence Science 2013年第4期3卷 170-175页

作者： jinchang wang School of Business Richard Stockton College of New Jersey Galloway Township USA

Whether digital computers can eventually be as intelligent as humans has been a topic of controversy for decades. Neither side of the debate has provided solid arguments proving this way or the other. After reviewing the contentions, we show in this article that machine intelligence is not unlimited. There exists an insurmountable barrier for digital computers to achieve the full range of human intelligence. Particularly, if a robot had a human’s sentience of life and death, then it would cause a logical contradiction. Therefore, a digital computer will never have the full range of human consciousness. This thesis substantiates a limit of computer intelligence and draws a line between biological humans and digital robots. It makes us rethink the issues as whether robots will remain forever one of the tools for us to use, or they will someday become a species competing with us;and whether robots can eventually dominate humans intellectually.

关键词： Artificial Intelligence Nature of Consciousness Intelligent Computers

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Self-Awareness,a Singularity of AI

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Journal of Philosophy Study 2023年第2期13卷 68-77页

作者： jinchang wang Stockton University GallowayNew JerseyUSA

Self-awareness,or self-consciousness,refers to reflective recognition of the existence of“subjective-self”.Every person has a subjective-self from which the person observes and interacts with the *** this article,we argue that self-consciousness is an enigmatic phenomenon unique in human *** many other intelligent and conscious capabilities,self-consciousness is not possible to be achieved in electronic computers and ***-consciousness is an odd-point of human intelligence and a singularity of artificial intelligence(AI).Man-made intelligence through software is not capable of self-consciousness;therefore,robots will never become a newly created *** of the lack of self-awareness,AI software,such as Watson,Alpha-zero,ChatGPT,and PaLM,will remain a tool of humans and will not dominate the human society no matter how smart it *** singularity of AI makes us re-think humbly what the future AI is like,what kind of robots we are going to deal with,and the blessing and threat of AI on humanity.

关键词： Self-consciousness Subjective-self Singularity AI Robot Machine Intelligence

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Regarding Constituents of Subjective-Self

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Journal of Philosophy Study 2019年第4期9卷 171-180页

作者： jinchang wang Stockton University New Jersey USA

The kernel of human consciousness is self-consciousness. We in this article explore the issue about what subjective-self is composed of. A distinctive feature of "I" is uniqueness or un-duplicableness. By critically reviewing a few thought experiments, we reason that subjective-self must be composed of more than a blob of brain cells which are sophisticated enough to think reflexively and a bundle of memories and perceptions. There must be a third constituent for the existence of "I". We put forward two hypotheses for the third constituent. One is that it is something like dark matters or dark energy. Another is that it is something in the higher dimensional space. A person would lose his self-consciousness after death since the death takes away the two necessary constituents of subjective-self, his brain and memories. Where the third constituent would go after death remains a mystery.

关键词： subjective self self-consciousness self-identity

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THE DGW-I FURNACE A MATERIALS PROCESSING FACILITY IN "SZ-2" SPACECRAFT

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空间科学学报 2002年第Z1期22卷 154-158页

作者： wang jinchang LIU Yan AI Fei YU Qiang REN Juanxi TAN Xiaochen CEI Weixing Shanghai Institute of Ceramics The Chinese Academy of SciencesShanghai 200050P.R.China Center for Space Science and Applied Research The Chinese Academy of SciencesP.R.China Lanzhou Institute of Physics The Chinese Academy of Space TechnologyP.R.China

The DGW-I is a new material processing facility developed in China,which was firstly carried into orbit in November 1999 by the SZ-1 spacecraft and then in January 2001 carried by SZ-2 into space again,and successfull... 详细信息

关键词： Microgravity Space material science Material processing facility

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中文核心期刊研究综述

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中国科技期刊研究 2005年第6期16卷 805-807页

作者：王进常河北师范大学图书馆

从历史回顾、现状、主要成果、作用和影响、走向等方面,时中文核心期刊研究进行了综述。

关键词：中文核心期刊核心期刊研究综述期刊研究中文

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海洋贝莱斯芽胞杆菌Bam-6全基因组测序及生物信息分析

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中国生物防治学报 2023年第2期39卷 438-452页

作者：王金昌江西省科学院微生物研究所南昌330096

贝莱斯芽胞杆菌Bam-6对柑橘溃疡病等植物病原菌具有较强抗菌活性,同时具有杀灭桃蚜的作用,为挖掘Bam-6特殊功能基因及基因簇,深入研究其抑菌杀虫机制,采用第二代BGISEQ与第三代Pac Bio平台相结合的测序技术对Bam-6进行全基因组测序,并... 详细信息

贝莱斯芽胞杆菌Bam-6对柑橘溃疡病等植物病原菌具有较强抗菌活性,同时具有杀灭桃蚜的作用,为挖掘Bam-6特殊功能基因及基因簇,深入研究其抑菌杀虫机制,采用第二代BGISEQ与第三代Pac Bio平台相结合的测序技术对Bam-6进行全基因组测序,并对测序数据进行基因组组装、基因预测与功能注释、共线性分析、次级代谢产物合成基因簇预测和比较基因组分析等。Bam-6全基因组全长为3928774 bp,GC含量为46.53%,共编码3861个ORF,含有86个t RNA基因、27个r RNA、0个s RNA、122个串联重复序列和2个卫星RNA。在NR、Swiss-Prot、eggNOG、GO和KEGG数据库分别注释到基因3840、2156、3485、3319和2721个。同时,生物信息学分析表明此菌株基因组中有12个次级代谢产物基因簇,包括3个未知功能的基因簇、8个相似度较高的抗生素合成基因簇(surfactin、macrolactin H、fengycin、bacillaene、difficidin、bacillibactin、bacilysin和mersacidin)和1个相似度仅为7%的抗生素基因簇(butirosinA/B)。与其它贝莱斯芽胞杆菌相比,Bam-6中存在许多相似度低的ORFs,有22个特异基因簇,有2个特有单拷贝基因分别编码类细菌素WGxF蛋白和乳球菌素972。本研究为解析菌株Bam-6的抑菌杀蚜机制从基因组层面上提供了基础数据,为深入了解贝莱斯芽胞杆菌次级代谢产物的合成途径提供提供参考信息,对菌株Bam-6后续相关研究具有重要意义。

关键词：贝莱斯芽胞杆菌基因组基因注释次级代谢

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Temperature Dependence of Magnetic Properties of SmCo/FeCo Multilayer Films

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Journal of Materials Science & Technology 2000年第2期16卷 199-200页

作者： Xianghua LIU, Ge YAN, Liya CUI and Shaoxiong ZHOU (National Amorphous & Nanocrystalline Alloy Engineering Research Center, Central Iron & Steel Research Institute, Beliing 100081, China) Wu ZHENG, Ailing wang and jinchang CHEN (Department of Physics, Cap National Amorphous and Nanocrystalline Alloy Engineering Research Center Central Iron and Steel Research Institute Beijing 100081 China Department of Physics Capital Normal University Beijing 100037 China

Sm22Co78/Fe65Co35/Sm22Co78/Fe65Co35 multilayer films were prepared by magnetron sputtering. The temperature dependence of coercivity (Hc), remanence (Mr) and reduced remanence (Mr/Ms) has been measured. The coercivity decreases with increasing of temperature. The remanence decreases with increasing the temperature from 26 to 100℃, and then increases with continuously increasing the temperature from 100 to 150℃. The reduced remanence increases with increasing the temperature.

关键词： Co Cr Temperature Dependence of Magnetic Properties of SmCo/FeCo Multilayer Films

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大牛地气田下套管作业中环空波动压力分析

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石油钻采工艺 2016年第1期38卷 36-41页

作者：王锦昌中石化华北分公司工程技术研究院

大牛地气田刘家沟组为低破裂压力带,套管下入过程中产生波动压力,易引起漏失。针对此问题,以稳态波动压力理论为依据,考虑扶正器的局部阻力效应,建立下套管波动压力计算模型,根据建立模型分析钻井液性能、套管下入速度、环空间隙等因素... 详细信息

大牛地气田刘家沟组为低破裂压力带,套管下入过程中产生波动压力,易引起漏失。针对此问题,以稳态波动压力理论为依据,考虑扶正器的局部阻力效应,建立下套管波动压力计算模型,根据建立模型分析钻井液性能、套管下入速度、环空间隙等因素对波动压力的影响,结果表明,随着钻井液密度、稠度系数、静切力、套管下入速度、扶正器的增加,环空间隙的减小,波动压力增加。针对波动压力影响因素,提出现场安全下套管技术对策,对下套管过程中避免因波动压力引起刘家沟组漏失具有重要的参考意义。

关键词：下套管波动压力预测模型钻井液性能扶正器环空间隙技术对策

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