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分布式光纤裂缝传感器

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

Decontamination of Landfill Leachate by Soil Infiltration

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Biomedical and Environmental Sciences 1989年第4期2卷 341-357页

作者： m.H.WONG K.C.leung Department of Biology Hong Kong Baptist CollegeKowloonHong Kong Department of Biology The Chinese University of Hong KongShatinHong Kong

A soil column study was conducted to evaluate the efficiency of soil to attenuate pollutants in landfill *** was found that more than 60% of the initial alkalinity,COD,and total nitrogen was removed after the leachate had percolated through the soil *** effi- ciencies were observed for the removal of dissolved cations,ammonia nitrogen,and nitrate *** previously percolated leachate was recirculated through the soil column,sig- nificant removal(93.6%)of ammonia nitrogen was ***,a further reduction in COD,total nitrogen,nitrate nitrogen,and potassium was *** tests of seed germi- nation and root growth of Brassica chinensis were performed to compare the phytotoxicities of untreated,percolated,and recirculated *** phytotoxicity was reduced by both treatments,with the greatest detoxification observed in the leachate recirculation *** values ofpH and Olsen phosphorus were significantly reduced(Pmn *** significant increases(Py(EC),various forms of nitrogen,exchangeable sodium percentage(ESP),potassium,magnesium,zinc,and iron were ***,ESP,potassium,magnesium,sodium,iron,and various forms of nitrogen accu- mulated at the soil surface(10 cm).On the other hand,manganese was deposited at 20 to 50 cm below the soil surface of the treated column.1989 Academic ***.

关键词：刀口井群

Special Focus on machine-Type Communications

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Science China(Information Sciences) 2017年第10期60卷 5-6页

作者： Xiaofeng TAO Ping ZHANG Victor C.m.leung Songwu LU yu CHEN Beijing University of Posts and Telecommunications The University of British Columbia The University of California

machine-type communication(mTC)refers to the communication between devices with or without the involvement of the network *** recent years,we have witnessed a rapid penetration of embedded devices;and we believed that... 详细信息

关键词： mTC In Special Focus on machine-Type Communications HTC ATS

Arm PSA-Certified IoT Chip Security: A Case Study

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Tsinghua Science and Technology 2023年第2期28卷 244-257页

作者： Fei Chen Duming Luo Jianqiang Li Victor C.m.leung Shiqi Li Junfeng Fan College of Computer Science and Software Engineering Shenzhen UniversityShenzhen 518060China Department of Electrical and Computer Engineering the University of British ColumbiaVancouverBC V6T 1Z4Canada Open Security Research Inc.Shenzhen 518000China

With the large scale adoption of Internet of Things(IoT)applications in people’s lives and industrial manufacturing processes,IoT security has become an important problem *** security significantly relies on the security of the underlying hardware chip,which often contains critical information,such as encryption *** understand existing IoT chip security,this study analyzes the security of an IoT security chip that has obtained an Arm Platform Security Architecture(PSA)Level 2 *** analysis shows that the chip leaks part of the encryption key and presents a considerable security ***,we use commodity equipment to collect electromagnetic traces of the *** a statistical T-test,we find that the target chip has physical leakage during the AES encryption *** further use correlation analysis to locate the detailed encryption interval in the collected electromagnetic trace for the Advanced Encryption Standard(AES)encryption *** the basis of the intermediate value correlation analysis,we recover half of the 16-byte AES encryption *** repeat the process for three different tests;in all the tests,we obtain the same result,and we recover around 8 bytes of the 16-byte AES encryption ***,experimental results indicate that despite the Arm PSA Level 2 certification,the target security chip still suffers from physical *** layer application developers should impose strong security mechanisms in addition to those of the chip itself to ensure IoT application security.

关键词： Internet of Things(IoT)security chip Arm Platform Security Architecture(PSA)certification electromagnetic side-channel attack Advanced Encryption Standard(AES)encryption key leakage

Homogentisic acid γ-lactone suppresses the virulence factors of Pseudomonas aeruginosa by quenching its quorum sensing signal molecules

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Chinese Chemical Letters 2018年第2期29卷 313-316页

作者： Shuihong Li Polly H.m. leung Xinya Xu Chunhui Wu Department of Health Technology and Informatics The Hong Kong Polytechnic University Hong Kong China Hunan Province Cooperative Innovation Center for molecular Target New Drug Study University of South China Hengyang 421001 China Key Laboratory of Tropical marine Bio-resources and Ecology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510201 Chino Center for Informational Biology University of Electronic Science and Technology of China Chengdu 610054 China

Bacterial quorum sensing（QS） molecules are involved in the coordination of certain behaviors such as biofilm formation, virulence and antibiotic resistance. QS molecules（autoinducers） and their corresponding receptors have been recognized as important therapeutic targets for drug-resistant infections and biofilm-associated infections（BAI）. This study assessed the multiple biological effects of homogentisic acid y-lactone（HgAL）, a furanone derivative. The anti-QS and anti-biofilm effects of HgAL against PAO1 strain were evaluated using CLSm, SEm, HPLC and other biochemical methods The results showed that HgAL could effectively inhibit the production of pyocyanin and extracellular matrix, as well as reduce the adherence ability and biofilm formation of Pseudomonas aeruginosa. Inhibition of virulence is attributed to the suppressive effect of HgAL on biosynthesis of 3-oxo-C12-HSLand C4-HSL（two kinds of QS signaling molecules in P. aeruginosa）. Our results support HgAL as a potential agent for prevention of BAI in the healthcare settings.

关键词： Homogentisicacid γ-lactone Quorum sensing Biofilm Pseudomonas aeruginosa Pyocyanin

Transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

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Applied mathematics and mechanics(English Edition) 2025年第1期46卷 177-192页

作者： m.NAVEED m.ImRAN T.ASGHAR Z.ABBAS Department of mathematics Division of Science and TechnologyUniversity of Education Department of mathematics The Islamia University of Bahawalpur

This paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. The influence of magnetic fields is also inspected in terms of their physical characteristics. To depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAm).The effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

关键词： hybrid nanofluid oscillating curved stretchable sheet gyrotactic microorganism Cattaneo-Christov heat and mass flux chemical reaction analytical solution O368

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)

Childhood Langerhans cell histiocytosis:a disease with many faces

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World Journal of Pediatrics 2019年第6期15卷 536-545页

作者： Alexander K.C.leung Joseph m.Lam Kin Fon Leong Department of Pediatrics The University of Calgaryand The Alberta Children's Hospital#20023316th Avenue NWCalgaryAB T2M 0H5Canada Department of Pediatrics University of British ColumbiaVancouverBCCanada Department of Dermatology and Skin Sciences University of British ColumbiaVancouverBCCanada Pediatric Institute Kuala Lumpur General HospitalKuala LumpurMalaysia

Background Langerhans cell histiocytosis(LCH)is a group of diseases characterized by the proliferation and accumulation of Langerhans *** presentations of LCH vary *** sources A Pubmed search was conducted using Clinical Queries with the key term "Langerhans cell histiocytosis".The search strategy included meta-analyses,randomized controlled trials,clinical trials,observational studies,and *** paper is based on,but not limited to,the search *** Generally,patients with LCH can be divided into two groups based on the extent of involvement at diagnosis,namely,single-system LCH and multisystem *** involvement may be unifocal or *** with isolated bone lesions typically present between 5 and 15 years of age,whereas those with multisystem LCH tend to present before 5 years of *** clinical spectrum is broad,ranging from an asymptomatic isolated skin or bone lesion to a life-threatening multisystem *** manifestations include,among others,"punched out" lytic bone lesion,seborrheic dermatitis-like erup-tion,erythematous/reddish-brown crusted/scaly papules/maculopapules/plaques/patches,and eczematous lesions,diabetes insipidus,hepatosplenomegaly,cytopenias,lymphadenopathy,and an acute fulminant disseminated multisystem condition presenting with fever,skin rash,anemia,thrombocytopenia,lymphadenopathy,and *** diagnosis is clinicopathologic,based on typical clinical findings and histologic/immunohistochemical examination of a biopsy of lesional *** CD1a,S100,and/or CD207(Langerin)immunohistochemical staining of lesional cells is required for a definitive *** waiting is recommended for patients with skin-only *** with symptomatic or refractory skin-only LCH may be treated with topical tacrolimus/corticosteroids,topical nitrogen mustard,oral methotrexate,or oral *** current recommended first-line therapy for patients with multisystem LCH i

关键词： Cytopenia Diabetes insipidus Eczematous lesions Hepatosplenomegaly Lymphadenopathy Seborrheic dermatitis-like eruption

Adaptive base-isolation of civil structures using variable amplification

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Earthquake Engineering and Engineering Vibration 2006年第2期5卷 223-233页

作者： kenneth K. Walsh makola m. Abdullah Department of Civil and Environmental Engineering FAMU-FSU College of Engineering Tallahassee FL 32310 USA

Semi-active dampers are used in base-isolation to reduce the seismic response of civil engineering structures. In the present study, a new semi-active damping system using variable amplification will be investigated for adaptive baseisolation. It uses a novel variable amplification device （VAD） connected in series with a passive damper. The VAD is capable of producing multiple amplification factors, each corresponding to a different amplification state. Forces from the damper are amplified to the structure according to the current amplification state, which is selected via a semi-active control algorithm specifically tailored to the system＇s tmique damping characteristics. To demonstrate the effectiveness of the VAD-damper system for adaptive base-isolation, numerical simulations are conducted for three and seven-story base-isolated buildings subject to both far and near-field ground motions. The results indicate that the system can achieve significant reductions in response compared to the base-isolated buildings with no damper. The proposed system is also found to perform well compared to a typical semi-active damper.

关键词： adaptive systems amplification base-isolation damping earthquake resistant structures multistorybuildings seismic isolation structural control