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Numerical study of the circular opening effect on mechanical behaviour of rock under confinement

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第6期11卷 1201-1210页

作者： y.L.Gui J.L.Shang J.J.Ma z.y.zhao school of engineering newcastle universitynewcastle upon tynene17ruunited kingdom school of civil and environmental engineering nanyang technological university639798singapore school of civil engineering sun yat-sen universityguangzhou510275china

Opening holes in rock including their size and distribution can affect the performance of rock-related structures.A good understanding on this will contribute to,for example,rock cavern design,and construction,tunnelling,and mining *** improve the understanding,a comprehensive investigation of the opening hole effect on the rock mechanical behaviour under biaxial loading condition is carried out by virtue of a hybrid continuum-discrete element *** specimens with both single hole and multi-hole of various radii are investigated and compared with the cases subjected to uniaxial *** is demonstrated that the confining pressure can increase both the stiffness and strength due to delaying the crack initiation and *** increase due to the confining pressure is more evident for the compressive *** single hole specimens with 0.75 mm radius hole,the increase ratio of the compressive strength is a linear increasing function with width and the increase ratio ranges from 2.15 for the specimen with 3.5 mm width to 2.45 for 10 mm *** the single hole specimen with 10 mm width,the increase ratio starts at 2.13 for the specimen with 0.75 mm radius hole,ascending to the peak of 2.37 for the specimen with 1 mm radius hole,followed by a decline to 2.2 for the specimen with 1.25 mm radius ***,for the multi-hole specimens,the increase ratio varies from 1.66 to *** addition,to verify the influence of confining pressure magnitude on the performance of the rock specimens,totalling 10 confining pressure levels are applied and *** simulation results show that even though there are opening holes in the specimens,the simulated compressive strength generally follows the generalised Hoek-Brown model.

关键词： Rock with opening Simulation Biaxial loading Strength Stiffness

新加坡南洋理工大学地下技术及岩土工程项目研究进展(英文)

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重庆交通大学学报（自然科学版） 2011年第A02期30卷 1106-1112,1191页

作者： z.y.zhao y.X.zhou X.M.An 南洋理工大学市政与环境工程学院新加坡639798 新加坡国防科技局新加坡639798

以新加坡南洋理工大学"地下技术及岩土工程项目"为依托,总结了南洋理工大学近期在岩土工程技术与地下防护技术领域所开展的研究工作。

关键词：岩土动力学波的传播地下空间技术数值分析

High-to ultrahigh-pressure(UHP)ductile shear zones in the Sulu UHP metamorphic belt,China:implications for continental subduction and exhumation

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High-to ultrahigh-pressure(UHP)ductile shear zones in the Su...

黄爱龙教授:“新型冠状病毒感染诱导机体特异性体液免疫反应的新认识”

中国科学院地质与地球物理研究所2003学术年会

作者： z.y.zhao,A.M.Fang and L.J.yu Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China

High- to ultrahigh-pressure(HP-UHP) metamorphic rocks that resulted from deep continental subduction and subsequent exhumation in the Sulu orogenic belt China,have experienced multiphase deformation and metamorphic overprint during its long journey to the mantle and return to the ***-UHP shear zones are strain-localized weak zones on which the UHP slab is transported over long ***-UHP shear zones are well exposed along a 200-km belt in the Sulu UHP metamorphic *** shear zones lie structurally below the UHP rocks and above the non-UHP rocks,suggesting the early exhumation of the UHP rocks by *** large area distribution,HP-UHP nature,high strain and structural association of the shear zones with the UHP rocks suggest that the shear zones are probably a regional detachment developed during the early stage of exhumation of the UHP *** indicators suggest top-to -the N-NW motion of the UHP slab during the exhumation, which,combined with isotope signature in Mesozoic igneous rocks,leads us to the interpretation that the subduction polarity is the North China plate down to the south rather than the yangtze plate down to the north in the Sulu region.

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重庆医科大学学报 2021年第12期46卷 F0002-F0002页

作者： y.Lin z.y.zhao J.X.zheng 不详

由严重急性呼吸综合征冠状病毒2(SARS-CoV-2)引起的2019年新型冠状病毒肺炎(COVID-19)疫情目前仍在全球大范围流行,这使全球公共卫生健康面临持续挑战。根据世界卫生组织最新实时统计数据:截至2021年3月28日,全球累计新冠肺炎确诊病例1... 详细信息

由严重急性呼吸综合征冠状病毒2(SARS-CoV-2)引起的2019年新型冠状病毒肺炎(COVID-19)疫情目前仍在全球大范围流行,这使全球公共卫生健康面临持续挑战。根据世界卫生组织最新实时统计数据:截至2021年3月28日,全球累计新冠肺炎确诊病例1.26亿例,累计死亡病例276.97万例。新冠肺炎疫情已对人类的健康和预期寿命等产生了巨大影响,严重损害了全球的叉流合作和稳定发展。新冠病毒感染人体后,可诱导机体产生病毒特异性的体液免疫反应,通过效应B细胞等产生大量的病毒抗原特异性抗体IgA、IgM和IgG等(含中和抗体)来控制病毒的增殖、扩散和再感染。

关键词：体液免疫反应特异性体液免疫中和抗体病毒特异性病毒感染抗原特异性抗体严重急性呼吸综合征冠状病毒全球公共卫生

Seismic stability analysis of rock slopes using the numerical manifold method

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Seismic stability analysis of rock slopes using the numerica...

Advances in the treatment of autism spectrum disorder:Wharton jelly mesenchymal stem cell transplantation

Harmonising Rock Engineering and the Environment—12th ISRM International Congress on Rock Mechanics

作者： X.M.An&y.J.Ning School of Civil and Environmental Engineering Nanyang Technological University Singapore G.W.Ma School of Civil and Resource Engineering University of Western Australia Crawley WA Australia z.y.zhao School of Civil and Environmental Engineering Nanyang Technological University Singapore

＜正＞Seismic stability of rock slopes is numerically investigated using the numerical manifold method（NMM）.A parallelepiped block resting on an inclined plane as shown in Figure 1,which has been considered as a first approximation of the rock slope stability conditions,is employed in this study to find out the fundamentals of seismic instabilities of rock slopes and to validate the NMM for seismic instability analysis of rock slopes.

关键词： Numerical modeling Risks and hazards Stability analysis

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World Journal of Methodology 2025年第1期15卷 72-79页

作者： Serdar Kabatas ErdinçCivelek Eyüp Can Savrunlu Umut Karaaslan Özlem yıldız Erdal Karaöz Department of Neurosurgery University of Health Sciences TurkeyGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Department of Pediatric Allergy-Immunology Institute of Health Sciences Marmara UniversityIstanbul 34865Türkiye Center for Stem Cell&Gene Therapy Research and Practice University of Health Sciences TurkeyIstanbul 34255Türkiye Department of Child and Adolescent Psychiatry University of Health SciencesGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Department of Child and Adolescent Psychiatry Kocaeli University Faculty of MedicineKocaeli 41001Türkiye Center for Regenerative Medicine and Stem Cell Research&Manufacturing Liv HospitalIstanbul 34340Türkiye Department of Histology and Embryology Istinye UniversityFaculty of MedicineIstanbul 34010Türkiye Center for Stem Cell and Tissue Engineering Research and Practice Istinye UniversityIstanbul 34340Türkiye

BACKGROUND Autism spectrum disorder(ASD)is a complex neurodevelopmental disorder with multifaceted *** recent studies,neuroinflammation and immune dysregulation have come to the forefront in its *** are studies suggesting that stem cell therapy may be effective in the treatment of *** To evolve the landscape of ASD treatment,focusing on the potential benefits and safety of stem cell *** A detailed case report is presented,displaying the positive outcomes observed in a child who underwent intrathecal and intravenous Wharton’s jelly-derived mesenchymal stem cells(WJ-MSCs)transplantation combined with *** The study demonstrates a significant improvement in the child’s functional outcomes(Childhood Autism Rating Scale,Denver 2 Developmental Screening Test),especially in language and gross motor *** serious side effects were encountered during the 2-year *** The findings support the safety and effectiveness of WJ-MSC transplantation in managing ASD.

关键词： Autism spectrum disorder Neurorehabilitation Stem cell transplantation Wharton jelly mesenchymal stem cells Inflammation

Analysis of Contact Melting Driven by Surface Heat Flux Around a Cylinder

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Journal of Thermal Science 2008年第1期17卷 64-68页

作者： y.S.zhao W.z.Chen F.R.Sun z.y.Chen Faculty of Thermal Engineering College of Power and ShippingNaval University of EngineeringWuhan 430033China Faculty of Thermal Engineering College of Power and ShippingNaval University of EngineeringWuhan 430033China Professor

The contact melting of phase change material around a moving horizontal cylindrical heat source, which descended under its own weight, is investigated in this article. A melting model under constant surface heat flux is established. The analytical results for thickness and pressure distributions inside melt layer and steady melting velocity are obtained by using contact melting theory. The melting law is discussed, and compared with that of contact melting driven by temperature difference. It is found that quasi-steady melting velocity is determined by heat flux of heat source, and the variation of heat source density has less effect on melting velocity.

关键词： Contact melting horizontal cylinder phase change phenomena

CALCULATION OF THE DAMPING OF THE zn-27Al ALLOy BASED ON THE MICRO INTERFACE SLIDING MODEL

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Acta Metallurgica Sinica(English Letters) 2006年第3期19卷 228-234页

作者： y.z. zhao Q. Gao y.C. Liu School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China Department of Applied Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China

The microstructures of the zn-27Al alloy after modification, solid-solution treatment, and natural aging were studied. It was clarified why the damping properties of zn-27Al alloys, after treatment, had advanced most on the basis of analyzing the microstructures. Approximate expressions have been educed, which can be used to quantificationally work out the damping of the zn-27Al alloy on the basis of the micro interface sliding model. By comparing the testing damping properties of the foundry zn-27Al alloys and the zn-27Al alloys after modification, solid solution, and natural aging, it was shown that the expressions were rational.

关键词： modification solid solution and aging damping micromechanism micro interface sliding model

y-Ba-Cu-O mixed oxides for production of diphenols in liquid-solid phase

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Chinese Journal of Chemistry 1996年第6期14卷 516-524页

作者： Liu, CB zhao, z yang, XG ye, XK Wu, y CHINESE ACAD SCI CHANGCHUN INST APPL CHEMCHANGCHUN 130022JILINPEOPLES R CHINA

Superconductor mixed oxides were often used as catalysts at higher temperature in gas phase oxidations, and considered not suitable for lower temperature reactions in the liquid-solid phase; here the catalysis of yBa2Cu3O7+/-x and y2BaCuO5+/-x in the phenol hydroxylation at lower temperature with H2O2 as oxygen donor was studied, and found that the superconductor yBa2Cu3O7+/-x, has no catalytic activity for phenol hydroxylation, but y2BaCuO5+/-x does, even has better catalytic activity and stability than most previously reported ones. With the studies of catalysis of other simple metal oxides and perovskite-like mixed oxides, a radical substitution mechanism is proposed and the experimental facts are explained clearly, and draw a conclusion that the perovskite-like mixed oxides with (AO)(ABO(3)) and (AO)2(ABO(3)) structure have better catalytic activity than the simple perovskite oxides with (ABO(3))(3) structure alone, and (AO) structure unit is the key for the mixed oxides to have the phenol hydroxylation activity. No pollution of this process is very important for its further industrial application.

关键词： superconductor mixed oxides phenol hydroxylation radical substitution