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以住房抵押贷款保险,保障房地产市场的长远稳定发展

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人类居住 2024年第1期 50-53页

作者：梁鹤年加拿大女王大学城市与区域规划学院

小康社会的标签是“丰衣足食”;富裕社会的标签是“家有恒产”。恒产就是“固定的产业”。对一般老百姓来说,就是房子。有了稳定的居所才可以对社会作稳定的贡献。可以说,安居才会乐业。人民有“置业”的愿望,国家有帮助人民置业的责任... 详细信息

小康社会的标签是“丰衣足食”;富裕社会的标签是“家有恒产”。恒产就是“固定的产业”。对一般老百姓来说,就是房子。有了稳定的居所才可以对社会作稳定的贡献。可以说,安居才会乐业。人民有“置业”的愿望,国家有帮助人民置业的责任。人民有房,不单是“民安”的保证,同时也是“国泰”(经济发展)的基础。建房,包括进住所需的装修、家具和后续的维修、保养都是国家经济和国民就业的一大支柱。买房更是人民储蓄转向生产投资的一大渠道。

关键词：房地产市场小康社会住房抵押贷款保险恒产富裕社会储蓄标签

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

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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

Paper-based aqueous Al ion battery with water-in-salt electrolyte

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Green Energy & Environment 2023年第5期8卷 1380-1388页

作者： yifei Wang Wending Pan Kee Wah Leong yingguang Zhang Xiaolong Zhao Shijing Luo Dennis y.C.leung School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518055China Department of Mechanical Engineering The University of Hong KongHong KongChina

Low-cost,flexible and safe battery technology is the key to the widespread usage of wearable electronics,among which the aqueous Al ion battery with water-in-salt electrolyte is a promising *** this work,a flexible aqueous Al ion battery is developed using cellulose paper as *** water-in-salt electrolyte is stored inside the paper,while the electrodes are either printed or attached on the paper surface,leading to a lightweight and thin-film battery ***,this battery can tolerate a charge and discharge rate as high as 4 A g^(-1) without losing its storage *** charge voltage is around 2.2 V,while the discharge plateau of 1.6–1.8 V is among the highest in reported aqueous Al ion batteries,together with a high discharge specific capacity of~140 mAh g^(-1).However,due to the water electrolysis side reaction,the faradaic efficiency can only reach 85%with a cycle life of 250 due to the dry out of *** from using flexible materials and aqueous electrolyte,this paper-based Al ion battery can tolerate various deformations such as bending,rolling and even puncturing without losing its *** two single cells are connected in series,the battery pack can provide a charge voltage of 4.3 V and a discharge plateau as high as 3–3.6 V,which are very close to commercial Li ion *** a cheap,flexible and safe battery technology may be widely applied in low-cost and large-quantity applications,such as RFID tags,smart packages and wearable biosensors in the future.

关键词： Al ion battery Aqueous electrolyte Water-in-salt Paper battery Flexible battery

Accelerated oxidation of VOCs via vacuum ultraviolet photolysis coupled with wet scrubbing process

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Journal of Environmental Sciences 2023年第12期134卷 55-64页

作者： Ruijie Xie Dongxue Lei Xiaowen Xie Ziyi Suo Dennis y.C.leung Jianping Cao Fang Ruimei Haibao Huang School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Department of Mechanical Engineering University of Hong KongHong Kong 999077China College of Environment and Resources Chongqing Technology and Business UniversityChongqing 400067China Scientific Research Academy of GuangXi Environmental Protection Nanning 530022China

Vacuum ultraviolet(VUV) photolysis is a facile method for volatile organic compounds(VOCs) elimination, but is greatly limited by the relatively low removal efficiency and the possible secondary pollution. To overcome above drawbacks, we developed an efficient method for VOCs elimination via VUV photolysis coupled with wet scrubbing process. In this coupled process, volatile toluene, a representative of VOCs, was oxidized by the gas-phase VUV photolysis, and then scrubbed into water for further oxidation by the liquid-phase VUV photolysis. More than 96% of toluene was efficiently removed by this coupled process, which was 2 times higher than that in the gas-phase VUV photolysis. This improvement was attributed to the synergistic effect between gas-phase and liquid-phase VUV photolysis. O3and HO·are the predomination reactive species for the toluene degradation in this coupled process, and the generation of O3in gas-phase VUV photolysis can efficiently enhance the HO·production in liquid-phase VUV photolysis. The result from in-situ proton transfer reaction ionization with mass analyzer(PTR-MS) further suggested that most intermediates were trapped by the wet scrubbing process and efficiently oxidized by the liquid-phase VUV photolysis, showing a high performance for controlling the secondary pollution. Furthermore, the result of stability test and the reuse of solution demonstrated that this coupled process has a highly stable and sustainable performance for toluene degradation. This study presents an environmentally benign and highly efficient VUV photolysis for gaseous VOCs removal in the wet scrubbing process.

关键词： Volatile organic compounds(VOCs) Vacuum ultraviolet(VUV)photolysis Wet scrubbing process Toluene degradation Intermediates analysis

UV light-induced oxygen doping in graphitic carbon nitride with suppressed deep trapping for enhancement in CO_(2) photoreduction activity

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Journal of Materials Science & Technology 2023年第2期133卷 135-144页

作者： Xiaolong Zhao Xiaoping yi Wending Pan yifei Wang Shijing Luo yingguang Zhang Ruijie Xie Dennis y.C.leung Department of Mechanical Engineering the University of Hong KongPokfulam RoadHong KongChina School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China

While photoreduction of CO_(2) to CH 4 is an effective means of producing value-added fuels,common pho-tocatalysts have poor activity and low selectivity in photocatalytic CO_(2)-reduction *** though creating defects is an effective photocatalyst fabrication route to improve photocatalytic activity,there are some challenges with the facile photocatalyst synthesis *** this work,an O element is in-troduced into a graphitic carbon nitride(CN)skeleton through a precursory ultraviolet light irradiation pretreatment to increase the visible light absorption and enhance the carrier density of this modified non-metal CN photocatalyst;the charge transfer dynamics thereof are also studied through electrochem-ical tests,photoluminescence spectroscopy,and nanosecond transient *** verify that the op-timized sample exhibits lower charge recombination and a suppressed 84 ns electron-trapping lifetime,compared to the 103 ns electron-trapping lifetime of the CN counterpart,and thereby contributes to ro-bust detrapping and a fast transfer of active *** density functional theory calculations,we find that the improved light absorption and increased electron density are ascribed to O-element doping,which enhances the CO_(2) adsorption energy and improves the CO_(2)-to-CH 4 photoreduction activity;it be-comes 17 times higher than that of the bare CN,and the selectivity is 3.8 times higher than that of ***,the optimized sample demonstrates excellent cyclic stability in a 24-hour cycle test.

关键词： UV light Oxygen doping Charge transfer Graphitic carbon nitride CO_(2)reduction

Construction of a novel Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)plasmonic heterojunction photocatalyst for high-efficiency photocatalysis

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Journal of Materials Science & Technology 2022年第6期101卷 37-48页

作者： Feihu Mu Benlin Dai Wei Zhao Shijian Zhou Haibao Huang Gang yang Dehua Xia yan Kong Dennis y.C leung Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials School of Chemistry and Chemical EngineeringHuaiyin Normal UniversityHuaian 223300China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Environmental Science and Engineering Sun Yat-Sen UniversityGuangzhou 510000China

To boost the visible light catalytic performance of typical metal-organic frameworks(MOFs)materials(MIL-68(In)-NH_(2)),a novel stable Z-scheme Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)plasmonic photocatalyst was constructed by electrostatic attraction,co-precipitation reaction,and in-situ photoreduction reaction methods for the first *** photocatalytic activities of the photocatalysts are systematically explored by the photocatalytic degradation of bisphenol A(BPA)and reduction of Cr(VI)under visible ***/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)displays the best photocatalytic performance among the as-prepared *** rate constant of BPA degradation on Ag/Ag_(3)PO_(4)/MIL-68(In)-NH_(2)is 0.09655 min^(-1),which is better than many reported photocatalytic *** also achieved a maximum rate constant of 0.02074min^(-1)for Cr(VI)*** boosted photocatalytic performance is due to the improved absorption caused by localized surface plasmon resonance(LSPR),effective interface charge transfer and separation,and more reactive sites provided by the large specific surface ***,the photocatalytic degradation pathway of BPA is concluded according to GC-MS ***,a more reasonable Z-scheme mechanism is speculated and verified through a series of characterizations and simulations,such as timeresolved photoluminescence spectroscopy(TRPL),electron spin resonance(ESR),and finite difference time domain(FDTD)method.

关键词： Photocatalysis Localized surface plasmon resonance Z-scheme MOFs Ag_(3)PO_(4)

Fibrotic components in vertebral joint degeneration

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Fibrotic components in vertebral joint degeneration

一种基于深度学习的新型针灸针自动计数的云服务系统:提高针灸安全性的策略

中国生理学会基质生物学专业委员会第四次全国基质生物学学术会议

作者： Victor y.leung The University of Hong Kong

Low back pain is a common cause of disability leading to significant healthcare burden *** studies indicate an association between back pain and degeneration of vertebral joints,in particular the intervertebral discs(IVD).How IVD degeneration initiates and what causes it to progress remains elusive to *** degeneration exhibits not only a decrease in proteoglycan level,which compromises tissue mechanical strength,but also abnormal collagen deposition in the nucleus *** change of the matrices compromises the IVD function and causes the disc to collapse under spinal *** primary factors leading to such matrix changes have been a subject of *** tissues suffer from chronic injury and inflammation,fibroblastic activities may become excessive,resulting in tissue fibrosis or *** have recently identified profibrotic components in the nucleus pulposus of degenerative human IVD and animal models of disc degeneration,implying that disc degeneration may be in part attributed to unresolved fibrotic *** study of markers and utilizing transgenic mouse models,we have identified a role of fibroblastic cells and their potential origin in the degenerating *** study implicates a role of profibrogenic pathways in the progression of IVD degeneration,sheding light onto future strategies for modifying the disorder.

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Digital Chinese Medicine 2024年第1期7卷 40-46页

作者：黄梓皓韦君逸陈海勇吴凤亮香港大学李嘉诚医学院中医药学院中国香港999077 Department of Mathematics and Statistics Georgetown UniversityWashington D.C.20057USA 香港理工大学康复科学系中国香港999077

目的病人针灸治疗时,漏针可能造成严重后果。为增强针灸安全性,本研究将开发一个基于深度学习的自动云端数针系统。方法本研究利用拍有针灸针的手机图片为曾预先训练的定向目标检测模型(Oriented R-CNN)进行转移学习,以开发一种能够自... 详细信息

目的病人针灸治疗时,漏针可能造成严重后果。为增强针灸安全性,本研究将开发一个基于深度学习的自动云端数针系统。方法本研究利用拍有针灸针的手机图片为曾预先训练的定向目标检测模型(Oriented R-CNN)进行转移学习,以开发一种能够自动计算图片中针灸针数量的目标检测算法。我们首先拍摄了一个包含590张图片的训练集以及一个包含1025张图片的验证集。随后在带有NVIDIA Tesla T4图形处理器(GPU)的Google Colab环境中部署了MMRotate工具箱为模型进行训练。我们将训练的模型与Telegram bot手机小程序界面集成,并评估模型的准确率、精确率和召回率。本小程序中云端数针系统的速度则以端到端处理时间计算。结果在每张图片20根针的验证集情景中,我们的定向检测模型在准确率、精确率和召回率上分别达到96.49%、99.98%和99.84%,平均端到端处理时间为1.535秒。结论这项云服务系统在速度、准确性和可靠性上的提升展示了深度学习物体检测技术改进针灸实践的潜力。

关键词：人工智能电脑视觉目标检测针灸病人安全

Interaction between gut microbiota and COVID-19 and its vaccines

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World Journal of Gastroenterology 2022年第40期28卷 5801-5806页

作者： John S M leung Cardiothoracic Unit St.Paul’s HospitalHong KongChina

The whole world has been continuously afflicted by the coronavirus disease 2019(COVID-19)pandemic for the past 3 *** countries have tried many methods to control this virus infection with varying successes and *** gut microbiota is a biosystem spanning the entire length of the digestive tract and playing important roles in health and *** is much affected by *** return it also substantially impacts *** particular,the gut microbiota has established a bidirectional interaction with the COVID-19 vaccines,enhancing or reducing vaccine efficacy by virtue of its varying ***,COVID-19 vaccines also make a substantial impact on the gut microbiota,reducing its overall population and *** is hoped that by exploring and harnessing this bidirectional interaction we may break new ground and develop new methods to prevent and treat this formidable virus infection.

关键词： Gut microbiota COVID-19 vaccines Vaccine interactions Gut microbiota alterations