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| 1 | Antibody neutralization to SARS-CoV-2 and variants after 1 year in Wuhan,China显示文摘Most COVID-19 convalescents can build effective anti-SARS-CoV-2 humoral immunity,but it remains unclear how long it can maintain and how efficiently it can prevent the reinfection of the emerging SARS-CoV-2 variants.Here,we tested the sera from 248 COVID-19 convalescents around 1 year post-infection in Wuhan,the earliest known epicenter.SARS-CoV-2 immunoglobulin G(IgG)was well maintained in most patients and potently neutralizes the infection of the original strain and the B.1.1.7 variant.However,varying degrees of immune escape was observed on the other tested variants in a patient-specific manner,with individuals showing remarkably broad neutralization potency.The immune escape can be largely attributed to several critical spike mutations.These results suggest that SARS-CoV-2 can elicit long-lasting immunity but this is escaped by the emerging variants. | Qianyun Liu Qing Xiong Fanghua Mei Chengbao Ma Zhen Zhang Bing Hu Junqiang Xu Yongzhong Jiang Faxian Zhan Suhua Zhou Li Tao Xianying Chen Ming Guo Xin Wang Yaohui Fang Shu Shen Yingle Liu Fang Liu Li Zhou Ke Xu Changwen Ke Fei Deng Kun Cai Huan Yan Yu Chen Ke Lan | 2022 | The Innovation2022，3，1： | 3 |
| 2 | Grain boundary optimization induced substantial squareness enhancement and high performance in iron-rich Sm-Co-Fe-Cu-Zr magnets显示文摘Increasing iron content has been witnessed an essential method to improve the remanence of 2:17-type Sm-Co-Fe-Cu-Zr magnets,however,the inferior squareness factor accompanied with the increased iron content turns into a neck sticking problem.In this work,the grain boundary optimization induced substantial squareness enhancement from 63.4%to 91.4%,and consequently an excellent maximum energy product of 32.63 MGOe have been achieved in iron-rich Sm-Co-Fe-Cu-Zr magnets via tuning solution process.It is clearly revealed that the grain boundary(GB)phases as well as the micro-twins’density in grain interiors can be controlled and interprets the enhancement mechanism of squareness. | Jun Cao Tianli Zhang Jinghua Liu Hao Xu Mingyao Hu Wei Xia Ao Wang Hui Wang Chengbao Jiang | 2021 | Journal of Materials Science & Technology2021，，26： | 2 |
| 3 | Experimental and Numerical Investigation on the Tensile Fracture of Compacted Clay显示文摘This paper performed flexural test and numerical simulation of clay-beams with different water contents to study the tensile fracture of clay soil and the relevant mechanisms.The crack initiation and propagation process and the accompanied strain localization behaviors were all clearly observed and analyzed.The exponential cohesive zone model was proposed to simulate the crack interface behavior of the cohesive-frictional materials.The experimental results show that the bending capacity of clay-beams decrease with the water content,while those of the crack mouth opening displacement,crack-tip strain and the strain localization range increase.The numerical predictions successfully reproduce the evolving tensile cracks and the strain localization phenomenon of the clay beams with different fracture ductility,which demonstrates the validity of the proposed cohesive zone model in modelling clay fractures. | Chengbao Hu Liang Wang Daosheng Ling Wujun Cai Zhijie Huang Shilin Gong | 2020 | Computer Modeling in Engineering & Sciences2020，，4： | 0 |
| 4 | Finite Element Simulations of the Localized Failure and Fracture Propagation in Cohesive Materials with Friction显示文摘Strain localization frequently occurs in cohesive materials with friction(e.g.,composites,soils,rocks)and is widely recognized as a fundamental cause of progressive structural failure.Nonetheless,achieving high-fidelity simulation for this issue,particularly concerning strong discontinuities and tension-compression-shear behaviors within localized zones,remains significantly constrained.In response,this study introduces an integrated algorithmwithin the finite element framework,merging a coupled cohesive zone model(CZM)with the nonlinear augmented finite elementmethod(N-AFEM).The coupledCZMcomprehensively describes tension-compression and compressionshear failure behaviors in cohesive,frictional materials,while the N-AFEM allows nonlinear coupled intraelement discontinuities without necessitating extra nodes or nodal DoFs.Following CZM validation using existing experimental data,this integrated algorithm was utilized to analyze soil slope failure mechanisms involving a specific tensile strength and to assess the impact of mechanical parameters(e.g.,tensile strength,weighting factor,modulus)in soils. | Chengbao Hu Shilin Gong Bin Chen Zhongling Zong Xingwang Bao Xiaojian Ru | 2024 | Computer Modeling in Engineering & Sciences2024，140，7： | 0 |
| 5 | Strong in-plane optical anisotropy in 2D van der Waals antiferromagnet VOCl显示文摘Two-dimensional(2D)van der Waals(vdW)magnetic materials with strong in-plane anisotropy can make possible novel applications such as optospintronics and strain sensors.In this work,the strong in-plane optical anisotropy in 2D vdW antiferromagnet VOCl has been systematically investigated.The optical brightness and absorption coefficient exhibit evident periodic variation with the change of incident polarization,unveiling the strong in-plane anisotropic optical absorption.The Raman intensity in this material shows obvious dependence on the polarization angle of incident laser,demonstrating that the phonon properties possess strong in-plane anisotropy.Besides,we have also realized in-situ visualization of in-plane optical reflection anisotropy in this material.Moreover,the strong second harmonic generation(SHG)signal can only be detected when the incident polarization is along specific in-plane crystal orientations,illustrating the presence of strong in-plane nonlinear optical anisotropy.These findings will benefit the applications of VOCl in the field of polarization-dependent electronics and spintronics. | Tianle Zhang Jiantao Du Wenjun Wang Keming Wu Shuai Yue Xinfeng Liu Wanfu Shen Chunguang Hu Minghui Wu Zhe Qu Shengxue Yang Chengbao Jiang | 2023 | Nano Research2023，16，5： | 0 |
| 6 | Mechanical performances of shield tunnel segments under asymmetric unloading induced by pit excavation显示文摘To explore the stress and deformation responses,as well as the failure characteristics of the shield tunnel segment of Hangzhou Metro under the influences of pit excavation and other surrounding projects,a self-developed“shield tunnel segment hydraulic loading system”was used to carry out full-scale loading tests on the three-ring staggered assembled segments.The structural performances and failure process of the tunnel segment under step-by-step asymmetric unloading were studied.A safety index was proposed to describe the bearing capacity of the segment.Next,a finite element model(FEM)was established to analyze the bearing capacity of segment using the test results.Finally,the effect of reinforcement with a steel plate on the deformation and bearing capacity of the segment was analyzed.The results showed that under asymmetric unloading,the peak value and amplitude of the bending moment on the near unloading side converged with a greater value than those on the far side.The concrete internal force exhibited a directional transformation at different load stages.Cracks first appeared at the 180inner arc surface of the bottom standard block and then expanded to both sides,while the rate of crack propagation of the outer arc surface was relatively lower.The bearing capacity of the segments can be evaluated by the combination of the factors,e.g.the residual bearing capacity coefficient,moment transfer coefficient,and characterization coefficient.The segments approaching failure can facilitate the increase in the residual bearing capacity coefficient by more than 50%.This can provide guidance for the service assessment of metro tunnel operations. | Gang Wei Feifan Feng Chengbao Hu Jiaxuan Zhu Xiao Wang | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，6： | 0 |
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