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Compressive properties of a novel slurry-infiltrated fiber concrete reinforced with arc-shaped steel fibers

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第6期24卷 543-556页

作者： Hedong LI yabiao LI yunfeng PAN P.L.NG christopher k.y.leung Xin ZHAO School of Civil Engineering and Architecture Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Civil Engineering The University of Hong KongHong Kong 999077China Faculty of Civil Engineering Vilnius Gediminas Technical UniversityVilnius LT-10223Lithuania Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China

Slurry-infiltrated fiber concrete(SIFCON)is a sort of strain hardening cement-based composite material,typically made with 5%–20%steel *** study focused on a novel type of SIFCON in which hooked-end steel fibers were replaced by arc-shaped steel *** quasi-static compressive properties of the SIFCON were first *** results suggested that using arc-shaped steel fibers in lieu of hooked-end steel fibers increased the quasi-static compressive strength by 47.1%and the strain at peak stress by 56.3%.We attribute these improvements to new crack-resisting mechanisms,namely“fiber crosslock”,“dual bridging”,and“confinement loops”,when the arc-shaped steel fibers are introduced into *** high impact resistance is a special property of SIFCON that is of practical significance,the dynamic compressive properties of arc-shaped steel fiber SIFCON were studied by using an 80-mm-diameter split Hopkinson pressure bar(SHPB).The results showed that the dynamic compressive strength,dynamic increase factor(DIF),and dynamic toughness of SIFCON all increased with the strain *** SIFCON incorporating arc-shaped steel fibers proved to have significant advantages in structural applications requiring high impact resistance.

关键词： Slurry-infiltrated fiber concrete(SIFCON) Arc-shaped steel fiber Quasi-static compressive properties Spilt Hopkinson pressure bar(SHPB) Dynamic compressive properties

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分布式光纤裂缝传感器

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压电与声光 2004年第1期26卷 10-12页

作者：江毅 christopher k.y.leung 北京理工大学光电工程系北京100081 香港科技大学土木工程系

研究了一种利用光时域反射计(OTDR)技术的分布式光纤裂缝传感器,测量了裂缝宽度与损耗之间的关系。它可同时测量出裂缝的位置和裂缝的宽度,可测量裂缝的范围在0.2～2mm之间,能够满足一般混凝土结构的裂缝实时检测的需要。

关键词：裂缝光时域反射计(OTDR) 混凝土光纤传感器

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光纤光栅腐蚀传感器

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光子学报 2006年第1期35卷 96-99页

作者：江毅严云 christopher k.y.leung 北京理工大学信息学院光电子研究所北京100081 西南科技大学材料科学与工程学院绵阳621010 香港科技大学土木工程系

提出了一种测量钢筋腐蚀的新型传感器·这种传感器将光纤光栅拉伸后固定在圆形钢筋的表面,在钢筋被腐蚀后,光纤光栅所受到的拉伸应变将被释放,光纤光栅的反射光波长发生变化,通过测量光纤光栅的波长就可以测得钢筋腐蚀程度·这种传感器... 详细信息

提出了一种测量钢筋腐蚀的新型传感器·这种传感器将光纤光栅拉伸后固定在圆形钢筋的表面,在钢筋被腐蚀后,光纤光栅所受到的拉伸应变将被释放,光纤光栅的反射光波长发生变化,通过测量光纤光栅的波长就可以测得钢筋腐蚀程度·这种传感器测量准确度优于±0.1μm,测量范围约12μm,可用于混凝土结构中钢筋腐蚀的早期监测·

关键词：光纤光栅光纤传感器腐蚀

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复合材料梁修复层脱落的光纤检测技术

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建筑材料学报 2006年第1期9卷 28-31页

作者：江毅许颖 christopher k.y.leung 北京理工大学信息学院北京100081 香港科技大学土木工程系

用基于3×3耦合器的光纤Mach-Zehnder干涉仪对复合材料梁修复层的脱落进行检测.实验表明:在复合材料梁处于连续支撑状态时,这一技术能够有效检测出修复层脱落的位置;在复合材料梁处于简单支撑状态且外加力较小时,也可以检测出修复层脱... 详细信息

用基于3×3耦合器的光纤Mach-Zehnder干涉仪对复合材料梁修复层的脱落进行检测.实验表明:在复合材料梁处于连续支撑状态时,这一技术能够有效检测出修复层脱落的位置;在复合材料梁处于简单支撑状态且外加力较小时,也可以检测出修复层脱落的位置.这一技术可用于航空航天领域或其它使用碳纤维进行修复的场所.

关键词：光纤传感器复合材料检测

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新型弧形钢纤维渗浇纤维混凝土的压缩性能研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第6期 543-557页

作者：李贺东李亚彪潘云锋 P.L.NG christopher k.y.leung 赵昕浙江理工大学建筑工程学院香港大学土木工程系维尔纽斯格迪米纳斯技术大学土木工程学院香港科技大学土木与环境工程系浙江科技学院建筑工程学院

目的：渗浇纤维混凝土（SIFCON）的力学性能受纤维类型的影响较大，弧形钢纤维代替端钩钢纤维制备SIFCON引入了潜在可明显提升SIFCON力学性能的纤维桥联机制。本文旨在研究利用弧形钢纤维制备SIFCON提升其压缩性能的可行性，并初步研究... 详细信息

目的：渗浇纤维混凝土（SIFCON）的力学性能受纤维类型的影响较大，弧形钢纤维代替端钩钢纤维制备SIFCON引入了潜在可明显提升SIFCON力学性能的纤维桥联机制。本文旨在研究利用弧形钢纤维制备SIFCON提升其压缩性能的可行性，并初步研究弧形钢纤维SIFCON在中低应变率下的抗压性能。创新点：1.利用弧形钢纤维制备新型SIFCON;2.提出弧形钢纤维在SIFCON中潜在的新型桥联机制；3.研究弧形钢纤维SIFCON中低应变率下的单轴压缩性能。方法：综合利用准静态压缩试验和霍普金森压杆试验，研究弧形钢纤维SIFCON的压缩性能，系统分析不同的应变率对弧形钢纤维SIFCON的破坏模式、动态压缩强度、动态应力-应变曲线、动态增强因子和动态韧性的影响。结论：1.在纤维体积分数相近、纤维长径比相同的情况下，采用弧形钢纤维代替普通端钩钢纤维可显著提高SIFCON的准静态压缩性能。2.在SIFCON中采用的“纤维勾连”机制、裂纹表面“二次桥联”、最少两纤维形成“约束环”等措施可有效提高弧形钢纤维的准静态压缩性能。在动态压缩试验中，由于试件尺寸较小和切割过程导致“纤维勾连”机制的潜力减小，限制了动态压缩性能的提高。建议进一步研究采用更好的动态压缩试验方法，以充分反映弧形钢纤维的贡献。3.脆性基体和弧形钢纤维SIFCON均为应变速率敏感材料，其动态抗压强度、动态增加因子（DIF）和动态韧性均随应变速率的增大而增大。从试验结果来看，在高应变率下，采用FIB Model Code2010的公式高估了脆性基体和弧形钢纤维SIFCON的DIF。因此，有必要建立脆性基体和弧形钢纤维SIFCON材料的替代DIF模型。4.与其他纤维增强混凝土相比，在相同应变率下，弧形钢纤维SIFCON具有更大的变形和能量吸收能力。显然，采用弧形钢纤维的SIFCON在结构应用中具有良好的抗冲击载荷性能。

关键词：渗浇纤维混凝土弧形钢纤维准静态压缩性能霍普金森压杆动态压缩性能

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用光纤光栅测量混凝土中钢筋的腐蚀——第一部分:基本原理与加速试验的结果

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四川建筑科学研究 2005年第6期31卷 148-151页

作者：严云江毅 christopher k.y.leung 西南科技大学材料科学与工程学院四川绵阳621010 北京理工大学信息学院光电工程系北京100081 香港科技大学土木工程系

基于混凝土中钢筋腐蚀后体积变化的事实,提出了一种测量钢筋腐蚀的新型传感器。为了验证这一设想,将光纤光栅拉伸后固定在圆形钢筋的表面,放入腐蚀溶液中加速钢筋的腐蚀。在钢筋被腐蚀后,光纤光栅所受到的拉伸应变将被释放,光纤光栅的... 详细信息

基于混凝土中钢筋腐蚀后体积变化的事实,提出了一种测量钢筋腐蚀的新型传感器。为了验证这一设想,将光纤光栅拉伸后固定在圆形钢筋的表面,放入腐蚀溶液中加速钢筋的腐蚀。在钢筋被腐蚀后,光纤光栅所受到的拉伸应变将被释放,光纤光栅的反射光波长发生变化,通过测量光纤光栅的波长就可以测得钢筋腐蚀程度。试验表明,光纤光栅可以用来测量混凝土中钢筋的腐蚀,测量精度优于±0.1μm,测量范围约12μm,非常适用于混凝土结构中钢筋腐蚀的早期监测。

关键词：光纤光栅光纤传感器腐蚀混凝土

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Impact of effective stress on permeability for carbonate fractured-vuggy rocks

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 942-960页

作者： ke Sun Huiqing Liu Juliana y.leung Jing Wang yabin Feng Renjie Liu Zhijiang kang yun Zhang State key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China School of Mining&Petroleum Engineering University of AlbertaEdmontonT6G 1H9Canada SINOPEC Petroleum Exploration and Production Research Institute Beijing100083China

To gain insight into the flow mechanisms and stress sensitivity for fractured-vuggy reservoirs,several core models with different structural characteristics were designed and fabricated to investigate the impact of effective stress on permeability for carbonate fractured-vuggy rocks(CFVR).It shows that the permeability performance curves under different pore and confining pressures(*** stress conditions)for the fractured core models and the vuggy core models have similar change *** ranges of permeability variation are significantly wider at high pore pressures,indicating that permeability reduction is the most significant during the early stage of development for fractured-vuggy *** each obtained effective stress coefficient for permeability(ESCP)varies with the changes in confining pressure and pore pressure,the effective stresses for permeability of four representative CFVR show obvious nonlinear characteristics,and the variation ranges of ESCP are all between 0 and ***,a comprehensive ESCP mathematical model considering triple media,including matrix pores,fractures,and dissolved vugs,was *** is proved theoretically that the ESCP of CFVR generally varies between 0 and ***,the regression results showed that the power model ranked highest among the four empirical models mainly applied in stress sensitivity characterization,followed by the logarithmic model,exponential model,and binomial *** concept of“permeability decline rate”was introduced to better evaluate the stress sensitivity performance for CFVR,in which the one-fracture rock is the strongest,followed by the fracture-vug rock and two-horizontalfracture rock;the through-hole rock is the *** general,this study provides a theoretical basis to guide the design of development and adjustment programs for carbonate fractured-vuggy reservoirs.

关键词： Effective stress Permeability Carbonate fractured-vuggy rocks Structure characteristics Stress sensitivity

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Quantitative and qualitative subgenomic RNA profiles of SARS-CoV-2 in respiratory samples: A comparison between Omicron BA.2 and non-VOC-D614G

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Virologica Sinica 2024年第2期39卷 218-227页

作者： Zigui Chen Rita Way yin Ng Grace Lui Lowell Ling Agnes S.y.leung Chit Chow Siaw Shi Boon Wendy C.S.Ho Maggie Haitian Wang Renee Wan yi Chan Albert Martin Li David Shu Cheong Hui Paul kay Sheung Chan Department of Microbiology Faculty of MedicineThe Chinese University of Hong KongHong KongChina Department of Medicine and Therapeutics Faculty of MedicineThe Chinese University of Hong KongHong KongChina Department of Anaesthesia and Intensive Care Faculty of MedicineThe Chinese University of Hong KongHong KongChina Department of Paediatrics Faculty of MedicineThe Chinese University of Hong KongHong KongChina Department of Anatomical and Cellular Pathology Faculty of MedicineThe Chinese University of Hong KongHong KongChina Jockey Club School of Public Health and Primary Care Faculty of MedicineThe Chinese University of Hong KongHong KongChina Stanley Ho Centre for Emerging Infectious Diseases Faculty of MedicineThe Chinese University of Hong KongHong KongChina

The SARS-CoV-2 Omicron variants are notorious for their transmissibility,but little is known about their subgenomic RNA(sgRNA)*** study applied RNA-seq to delineate the quantitative and qualitative profiles of canonical sgRNA of 118 respiratory samples collected from patients infected with Omicron BA.2 and compared with 338 patients infected with non-variant of concern(non-VOC)-D614G.A unique characteristic profile depicted by the relative abundance of 9 canonical sgRNAs was reproduced by both BA.2 and non-VOCD614G regardless of host gender,age and presence of ***,such profile was lost in samples with low viral load,suggesting a potential application of sgRNA pattern to indicate viral activity of individual patient at a specific time point.A characteristic qualitative profile of canonical sgRNAs was also reproduced by both BA.2 and *** presence of a full set of canonical sgRNAs carried a coherent correlation with crude viral load(AUC¼0.91,95%CI 0.88–0.94),and sgRNA ORF7b was identified to be the best surrogate marker allowing feasible routine application in characterizing the infection status of individual *** potentials in using sgRNA as a target for vaccine and antiviral development are worth pursuing.

关键词： Coronavirus SARS-CoV-2 Omicron BA.2 Non-VOC-D614G RNA-seq Subgenomic RNA(sgRNA)

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Insight into endoplasmic reticulum-mitochondria contacts in human amyotrophic lateral sclerosis

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Neural Regeneration Research 2024年第7期19卷 1407-1408页

作者： Naomi Hartopp Andrea Markovinovic christopher CJ Miller Patricia Gomez-Suaga Sheffield Institute for Translational Neuroscience University of SheffieldSheffieldUK Department of Basic and Clinical Neuroscience Institute of PsychiatryPsychology and NeuroscienceLondonUK Universidad de Extremadura.Departamento de Bioquímica y Biología Molecular y Genética Facultad de Enfermería y Terapia OcupacionalCáceresSpain Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas-Instituto de Salud Carlos Ⅲ(CIBER-CIBERNED-ISCⅢ) MadridSpain Instituto Universitario de Investigación Biosanitaria de Extremadura(INUBE) CáceresSpain

Amyotrophic lateral sclerosis(ALS) is a fastprogressing fatal neurodegenerative disease and the most common form of motor neuron *** is currently no cure and approximately 90% of cases are *** shares genetic causes,clinical and neuropathological features with frontotemporal dementia,the second most common form of presenile *** and frontotemporal dementia are therefore considered a disease spectrum(Abramzon et al.,2020).

关键词： senile sclerosis

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Superior antibody and membrane protein‑specific T‑cell responses to CoronaVac by intradermal versus intramuscular routes in adolescents

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World Journal of Pediatrics 2024年第4期20卷 353-370页

作者： Jaime S.Rosa Duque Samuel M.S.Cheng Carolyn A.Cohen Daniel leung Xiwei Wang Xiaofeng Mu yuet Chung Tsun Ming Lau Manni Wang Wenyue Zhang yanmei Zhang Howard H.W.Wong Leo C.H.Tsang Sara Chaothai Tsz Chun kwan John k.C.Li karl C.k.Chan Leo L.H.Luk Jenson C.H.Ho Wing yan Li Amos M.T.Lee Jennifer H.y.Lam Sau Man Chan Wilfred H.S.Wong Issan y.S.Tam Masashi Mori Sophie A.Valkenburg Malik Peiris Wenwei Tu yu Lung Lau Department of Paediatrics and Adolescent Medicine The University of Hong KongHong KongChina School of Public Health The University of Hong KongHong KongChina HkU‑Pasteur Research Pole School of Public HealthThe University of Hong KongHong KongChina Research Institute for Bioresources and Biotechnology Ishikawa Prefectural UniversityNonoichiJapan Department of Microbiology and Immunology Peter Doherty Institute for Infectionand ImmunityUniversity of MelbourneMelbourneVICAustralia Center for Immunology and Infection C2i Hong KongChina

Background Optimising the immunogenicity of COVID-19 vaccines to improve their protection against disease is *** dosing by intradermal(ID)administration has been shown to be equally immunogenic as intramuscular(IM)administration for several vaccines,but the immunogenicity of ID inactivated whole severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)at the full dose is *** study(NCT04800133)investigated the superiority of antibody and T-cell responses of full-dose CoronaVac by ID over IM administration in *** Participants aged 11–17 years received two doses of IM or ID vaccine,followed by the 3rd dose 13–42 days *** and cellular immunogenicity outcomes were measured post-dose 2(IM-CC versus ID-CC)and post-dose 3(IMCCC versus ID-CCC).Doses 2 and 3 were administered to 173 and 104 adolescents,*** Spike protein(S)immunoglobulin G(IgG),S-receptor-binding domain(RBD)IgG,S IgG Fcγreceptor IIIa(FcγRIIIa)-binding,SNM[sum of individual(S),nucleocapsid protein(N),and membrane protein(M)peptide pool]-specific interleukin-2(IL-2)+CD4^(+),SNM-specific IL-2^(+)CD8^(+),S-specific IL-2^(+)CD8^(+),N-specific IL-2^(+)CD4^(+),N-specific IL-2^(+)CD8^(+)and M-specific IL-2^(+)CD4^(+)responses fulfilled the superior and non-inferior criteria for ID-CC compared to IM-CC,whereas IgG avidity was *** ID-CCC,S-RBD IgG,surrogate virus neutralisation test,90%plaque reduction neutralisation titre(PRNT90),PRNT50,S IgG avidity,S IgG FcγRIIIa-binding,M-specific IL-2^(+)CD4^(+),interferon-γ+CD8^(+)and IL-2^(+)CD8^(+)responses were superior and non-inferior to *** estimated vaccine efficacies were 49%,52%,66%and 79%for IM-CC,ID-CC,IM-CCC and ID-CCC,*** ID groups reported more local,mild adverse *** This is the first study to demonstrate superior antibody and M-specific T-cell responses by ID inactivated SARSCoV-2 vaccination and serves as the basis for future research to improve the

关键词： CoronaVac Coronavirus disease 2019 Immunity Intradermal Vaccine

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