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Crack propagation with different radius local random damage based on peridy.amic theory

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1238-1248页

作者： jinhai ZHAO Li TAN Xiaojing DOU Department of Civil Engineering Zhejiang University City CollegeHangzhou 3100015China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China College of Civil Engineering Tongji UniversityShanghai 200092China Shanghai Baoy. Group Corp. Ltd.Shanghai 200941China

Drawing from the advantages of Classical Mechanics,the peridy.amic theory.can clarify.the crack propagation mechanism by.an integral solution without initially.setting the factitious crack and crack *** study.implements the peridy.amic theory.by.subjecting bilateral notch cracked specimens to the conditions of no local damage,small radius local damage,and large radius local ***,to study.the effects of local stochastic damage with different radii on the crack propagation path and y.direction displacement,a comparison and contact methodology.was adopted,in which the crack propagation paths under uniaxial tension and displacement in the y.direction were compared and *** method can be applied to steel structures under similar local random damage conditions.

关键词： peridy.amics stochastic damage bilateral notch crack

The size matters： regulation of lipid storage by.lipid droplet dy.amics

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Science China(Life Sciences) 2017年第1期60卷 46-56页

作者： jinhai y. Peng Li Tsinghua-Peking Center for Life Sciences School of Life Sciences Tsinghua University Beijing 100084 China

Adequate energy.storage is essential for sustaining healthy.life. Lipid droplet （LD） is the subcellular organelle that stores energy.in the form of neutral lipids and releases fatty.acids under energy.deficient conditions. Energy.storage capacity.of LDs is primarily.dependent on the sizes of LDs. Enlargement and growth of LDs is controlled by.two molecular pathway.： neutral lipid sy.thesis and aty.ical LD fusion. Shrinkage of LDs is mediated by.the degradation of neutral lipids under energy.demanding conditions and is controlled by.neutral cy.osolic lipases and ly.osomal acidic lipases. In this review, we summarize recent progress regarding the regulatory.pathway. and molecular mechanisms that control the sizes and the energy.storage capacity.of LDs.

关键词： lipid storage lipid droplet TAG sy.thesis aty.ical LD fusion lipoly.is

Methane conversion in the presence of oxy.en under low-temperature radio frequency.plasma

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Journal of Natural Gas Chemistry 2010年第6期19卷 605-610页

作者： jinhai y.an Xuejun Zhong Shiy. Tan College of Chemistry.and Chemical Engineering Chongqing University of Science ＆ Technology Chongqing 401331 China Chongqing Chemical Engineering Design and Research Institute Chongqing 400039 China College of Chemistry.and Chemical Engineering Chongqing University Chongqing 40004 China

Methane conversion in the presence of oxy.en under low-temperature radio frequency.（RF） plasma was *** experiment results indicated that the following four factors,i.e.,discharge voltage,discharge area,O2/CH4 molar ratio and total gas flowrate,affected remarkably.the reaction *** optimum reaction conditions of methane conversion in the presence of O2 under RF plasma are as follows：discharge voltage 1050 V,discharge area 989.1mm 2,O2/CH4 molar ratio 1/10 and total gas flowrate 200 ml/min.A methane conversion of 91% could be reached under the optimum *** is good for the breaking of C-H bonds and also acts as a sort of *** to the low-temperature plasma characteristics,the macroscopic kinetics model of methane conversion in the presence of O2 under radio frequency.plasma was studied.

关键词： methane oxy.en radio frequency.plasma C2 hy.rocarbons kinetics

Peridy.amics versus XFEM:a comparative study.for quasistatic crack problems

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Frontiers of Structural and Civil Engineering 2018年第4期12卷 548-557页

作者： jinhai ZHAO Hesheng TANG Songtao XUE Research Institute of Structural Engineering and Disaster Reduction Tongji UniversityShanghai 200092China State Key.Laboratory.of Disaster Prevention in Civil Engineering Tongji UniversityShanghai 200092China

Peridy.amics (PD) is a nonlocal continuum theory.based on integro-differential equations without spatial derivatives. The fracture criterion is implicitly.incorporated in the PD theory.and fracture is a natural outcome of the simulation. However, capturing of complex mixed-mode crack patterns has been proven to be difficult with PD. On the other hand, the extended finite element method (XFEM) is one of the most popular methods for fracture which allows crack propagation with minimal remeshing. It requires a fracture criterion which is independent of the underly.ng discretization though a certain refinement is needed in order to obtain suitable results. This article presents a comparative study.between XFEM and PD. Therefore, two examples are studied. The first example is crack propagation in a double notched specimen under uniaxial tension with different crack spacings in loading direction. The second example is the specimens with two center cracks. The results show that PD as well as XFEM are well suited to capture this ty.e of behaviour.

关键词： XFEM peridy.amic bilateral crack parallel double cracks nonlocal theory

Preface for Special Issue for the Eighth Chinese-German Joint Sy.posium on Hy.raulic and Ocean Engineering

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Journal of Ocean University.of China 2017年第4期16卷 565-567页

作者： ZHENG jinhai SHI Hongda Key.Laboratory.of Coastal Disaster and Defence(Hohai University. Ministry of Education College of Engineering Ocean University of China

1 History.of Joint Sy.posium Social development has tightened the interaction between human beings and the water bodies on planet *** beings benefit much from inland rivers,estuaries,coastal waters and the vast open oceans through hy.raulic,ocean engineering and marine renewable ***,it is difficult for scientists and engineers to get

关键词：海洋工程水力可再生能源工程技术人员全球气候变化水动力环境社会发展相互作用

A new fracture criterion for peridy.amic and dual-horizon peridy.amics

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Frontiers of Structural and Civil Engineering 2018年第4期12卷 629-641页

A new fracture criterion based on the crack opening displacement for peridy.amic (PD) and dual-horizon peridy.amics (DH-PD) is proposed. When the relative deformation of the PD bond between the particles reaches the critical crack tip opening displacement of the fracture mechanics, we assume that the bond force vanishes. A new damage rule similar to the local damage rule in conventional PD is introduced to simulate fracture. The new formulation is developed for a linear elastic solid though the extension to nonlinear materials is straightforward. The performance of the new fracture criterion is demonstrated by.four examples, i.e. a bilateral crack problem, double parallel crack, monoclinic crack and the double inclined crack. The results are compared to experimental data and the results obtained by.other computational methods.

关键词： Castigliano’s theorem breaking energy critical extension XFEM COD PD-COD

Evidence for diurnal periodicity.of earthquakes from midnight to day.reak

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National Science Review 2019年第5期6卷 1016-1023页

作者： Jinlai Hao jinhai Zhang Zhenxing y.o Key.Laboratory.of Earth and Planetary.Phy.ics Institute of Geology and Geophysics Chinese Academy of Sciences

Previously. inadequate earthquake catalogs and the lack of method made it challenging, if not impossible, to determine the dominant period of earthquake *** the advent of densely.distributed seismic stations in Japan since 2002, 410 642 M1.0+ earthquakes have been cataloged under the mainland within30-km depth, which provide a superb dataset to identify.the periodicity.of *** processed this catalog using time-frequency.analy.es and daily.stacking, which are powerful in extracting weak periodical signal from strong random *** concentrated on the time sector from 0:00 to 6:00(*** midnight to day.reak), which is a reliable time window for much higher detectability.of weak earthquakes,since it has the lowest affects from cultural *** successfully.observed two apparent periodicities of12-and 24-hour, which are much smaller than the fortnightly.periodicity.presented previously.in the *** earth tides, after intentionally.ignoring the contribution from the Moon, present similar dominant periods as the *** may.indicate that the dominant period of earthquakes is statistically.associated with the Sun rather than the *** daily.stacking number of earthquakes using a15-minute or 1-hour interval shows a peak around 1:30, rather than usually.expected 3:00 to 4:*** addition, bigger earthquakes show more evident variations in the stacking results, and the trend is very.consistent for various lower limits of earthquake magnitude from M1.0 to *** discoveries settled the disputes on the existence of the periodicity.of earthquakes since 1886 and may.open a window to unravel the my.tery.of earthquakes.

关键词： periodicity.of earthquakes time-frequency.analy.es ocean tide earth tide Local Mean Time

Paleoproterozoic basement beneath the southern Jiangxi Province:Evidence from U-Pb ages and Lu-Hf isotopes in zircons from the Doushui lamprophy.e

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Chinese Science Bulletin 2009年第9期54卷 1555-1563页

作者： y. jinhai WANG LiJuan O'REILLy.S y.SHU LiangShu SUN Tao State Key.Laboratory.for Mineral Deposits Research School of Earth Sciences and Engineering Nanjing University Nanjing 210093 China GEMOC National Key.Centre Department of Earth and Planetary Science Macquarie University Sydney NSW 2109 Australia

这篇论文论述侵入的煌斑岩的 geochemical 分析在 Shangy.u 县的古苏格兰的 Doushui 花岗石身体，南部的江西省。U-Pb 标明日期和 Hf 同位素分析特别从它为锆石被执行。Petrological 和 geochemical 特征证明煌斑岩属于 high-K，弱碱的... 详细信息

这篇论文论述侵入的煌斑岩的 geochemical 分析在 Shangy.u 县的古苏格兰的 Doushui 花岗石身体，南部的江西省。U-Pb 标明日期和 Hf 同位素分析特别从它为锆石被执行。Petrological 和 geochemical 特征证明煌斑岩属于 high-K，弱碱的辉石黑云母煌斑岩。它被 Mg #(0.74 ) ， Ni (253 μg/g ) 和 Cr (893 μg/g ) 满足的高度描绘，并且也在不兼容的元素充实，例如 REE， Rb， Sr， Ba 和 K。它的原语融化，这被建议可能由 non-crust-derived 源于充实的披风 metasomatized 代理人。在煌斑岩标明日期锆石的结果的形态学和 LAM-ICPMS 显示他们是从深外壳的岩石捕获的 xenocry.ts。在 ∼1.86 Ga 形成的大多数 xenocry.tic 锆石，和在不同 Phanerozoic 时期的一些。Paleoproterozoic 锆石具有 magmatic 起源并且有类似的 176Hf/177 Hf 和 176Lu/177 Hf 比率，显示他们可能从一样的火的地下室岩石。年龄和从这地下室岩石的锆石的 Hf 同位素作文类似于在南部的浙江省的 Paleoproterozoic Danzhu 花岗石的那些，但是极其与 Nanling 地下室区分开来，建议学习区域可能是一向西在东方卡赛西亚·布洛克的 Paleoproterozoic Wuy.shan 岩层的延期部分。这些 Paleoproterozoic 锆石有低 Hf 同位素作文，外壳的来源特征。这些锆石的 Hf 模型年龄和在他们以内的更旧的继承核心的存在，结合了可得到的其它数据由以前的研究报导了，建议 Paleoproterozoic 岩浆的来源是 Neoarchaean 外壳，在 Wuy.shan 岩层暗示更旧的地下室的存在。U-Pb 年龄和五 Phanerozoic 锆石的 Hf 同位素显示那个 Paleoproterozoic 地下室经历了多重做的发生在古苏格兰， Indosinian 和早 y.nshanian 分别地。古苏格兰的 magmatism 也涉及少年外壳重做。

关键词：模式年龄铪同位素地下室江西省锆石 Pb 地球化学分析地壳岩石

Formation history.and protolith characteristics of granulite facies metamorphic rock in Central Cathay.ia deduced from U-Pb and Lu-Hf isotopic studies of single zircon grains

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Chinese Science Bulletin 2005年第18期50卷 2080-2089页

作者： y. jinhai ZHOU Xinmin y. S. O'Reilly.ZHAO Lei W. L. Griffin WANG Rucheng WANG Lijuan CHEN Xiaomin State Key.Laboratory.for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China GEMOC ARC National Key.Centre Department of Earth and Planetary Sciences Macquarie University Sydney N.S.W. 2109 Australia

The petrochemical as well as zircon U-Pb and Lu-Hf isotopic studies of granulite facies metamorphic rock from the Taoxi Group in eastern Nanling Range, Central Cathay.ia indicate that its protolith is the sedimentary.rock with low maturation index. The clastic materials are mostly.from middle Neoproterozoic (~736 Ma) granitoid rocks with minor Neoarchaean and Paleoproterozoic rocks. The timing of this Neoproterozoic magmatism is in agreement with the second period of magmatism widespread surrounding the y.ngtze Block. Hf isotopic data indicate that the Neoproterozoic granitoids resulted from the recy.led Paleoproterozoic mantle-derived crustal materials. The sedimentary.rock was deposited in Late Neoproterozoic Era, and carried into low crust in Early.Paleozoic. The partial melting of the meta-sedimentary.rock took place at about 480 Ma and subsequently.granulite facies metamorphism occurred at ca. 443 Ma. The zircons forming during this time interval (Early.Paleozoic) show large Hf isotope variations, and their -Hf(t) values increase from -13.2 to +2.36 with decreasing age, suggesting the injection of mantle-derived materials during partial melting and metamorphism processes in the Early.Paleozoic. Calculation results show that this metamorphic rock, if evolved to Mesozoic, has similar isotopic composition to the nearby.Mesozoic high Si peraluminous granites, imply.ng that this kind of granulite facies metamorphic rock is probably.the source material of some Mesozoic peraluminous granitoids in eastern Nanling Range.

关键词：麻粒岩锆石同位素变质结构沉积岩石