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World Journal of Emergency Medicine 2023年第4期14卷 307-311页

作者： Hon Chun kai man siu Department of Accident&Emergency Tseung Kwan O HospitalHong KongChina Department of Accident&Emergency United Christian HospitalHospitalHong KongChina

Aortic dissection(AD)is a potentially devastating cardiovascular disease ***,given the low incidence of AD(2.5 to 3.5 cases per 100,000person-years),the diagnosis of this disease remains relatively difficult in emergency settings.[1,2]Computed tomography aortogram(CTA)is the most commonly used diagnostic tool,which is an invasive investigation with renal impairment and is cost *** are lots of patients at low or moderate risk of AD,which may be no need for CTA *** a result,validated clinical strategies beyond clinical judgment are needed to manage patients with suspected AD.

关键词： patients dissection diagnosis

Recent progress on the Dirichlet divisor problem and the mean square of the Riemann zeta-function

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Science China Mathematics 2010年第9期53卷 2561-2572页

作者： TSANG kai-man Department of Mathematics The University of Hong Kong

Let Δ(x) and E(t) denote respectively the remainder terms in the Dirichlet divisor problem and the mean square formula for the Riemann zeta-function on the critical *** article is a survey of recent developments on the research of these famous error terms in number *** include upper bounds,Ω-results,sign changes,moments and distribution,etc.A few open problems are also discussed.

关键词： divisor problems Riemann’s zeta-function mean values

TRANSFECTION AND CELL FUSION BY FEMTOSECOND LASERS

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Journal of Innovative Optical Health Sciences 2011年第2期4卷 113-125页

作者： HAO HE siu kai KONG KAM TAI CHAN Department of Electronic Engineering The Chinese University of Hong Kong ShatinN.T.Hong Kong Department of Biochemistry The Chinese University of Hong Kong ShatinN.T.Hong Kong

Biophotonics is an exciting and fast-expanding frontier which involves the fusion of advanced photonics and *** has not only created many novel methodologies for biomedical research,but also achieved many significant results as an *** to femtosecond(fs)laser technologies,important progresses have been made regarding the manipulation,imaging,and engineering of biological samples ranging from single molecules to tissues in the last 20 *** ultrashort pulses at near-infrared band provide many advantages:high nonlinear efficiency,low absorption by biological samples,high spatial and temporal resolution and confinement,and low *** are noninvasive and easy to *** the mechanism of how fs laser pulses interact with cells remains unclear,experimental results have shown that they could open up the cell membrane and hence made optical transfection and optical cell fusion *** this review,some of the seminal works on transfection and cell fusion by fs lasers are *** ideas behind and the experimental details will be described together with a highlight on their ***,the thermal effect is analyzed based on multiphoton excitation and plasma formation in an aqueous environment to explain the nontoxic characteristic of fs laser ***,some applications of fs laser induced transfection and cellcell fusion with potential major impact in biomedical sciences are proposed.

关键词： Biophotonics transfection cell fusion femtosecond laser

Waring-Goldbach Problem for Unlike Powers

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Acta Mathematica Sinica,English Series 2007年第2期23卷 265-280页

作者： Xiu Min REN kai man TSANG Department of Mathematics Shandong University Department of Mathematics The University of Hong Kong

In this paper, it is proved that with at most O（N65/66） exceptions, all even positive integers up to N are expressible in the form p^2 2＋p^3 3＋p^4 4＋p^5 5. This improves a recent result O（N19193/19200＋ε） due... 详细信息

关键词： Waring-Goldbach problem circle method exceptional set

Statistical extremes and peak factors in wind-induced vibration of tall buildings

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第1期13卷 18-32页

作者： Ming-feng HUANG Chun-man CHAN Wen-juan LOU Kenny Chung-siu KWOK Institute of Structural Engineering Zhejiang University Hangzhou 310058 China Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Hong Kong School of Engineering University of Western Sydney NSW Australia

In the structural design of tall buildings, peak factors have been widely used to predict mean extreme responses of tall buildings under wind excitations. Vanmarcke＇s peak factor is directly related to an explicit measure of structural reliability against a Gaussian response process. We review the use of this factor for time-variant reliability design by comparing it to the conven- tional Davenport＇s peak factor. Based on the asymptotic theory of statistical extremes, a new closed-form peak factor, the so-called Gamma peak factor, can be obtained for a non-Gaussian resultant response characterized by a Rayleigh distribution process. Using the Gamma peak factor, a combined peak factor method was developed for predicting the expected maximum resultant responses of a building undergoing lateral-torsional vibration. The effects of the standard deviation ratio of two sway components and the inter-component correlation on the evaluation of peak resultant response were also investigated. Utilizing wind tunnel data derived from synchronous multi-pressure measurements, we carried out a wind-induced time history response analysis of the Common- wealth Advisory Aeronautical Research Council （CAARC） standard tall building to validate the applicability of the Gamma peak factor to the prediction of the peak resultant acceleration. Results from the building example indicated that the use of the Gamma peak factor enables accurate predictions to be made of the mean extreme resultant acceleration responses for dynamic service- ability performance design of modem tall buildings.

关键词： Level-crossing rate (LCR) Wind-induced vibration Mean extreme response Combined resultant process Peakfactor method

Electrodeposited 3D hierarchical NiFe microflowers assembled from nanosheets robust for the selective electrooxidation of furfuryl alcohol

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Green Energy & Environment 2023年第3期8卷 874-882页

作者： Biying Liu man Zhang Yaoyu Liu Yuchen Wang kai Yan Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen University135 Xingang Xi RoadGuangzhou510275China

A robust and green strategy for the selective upgrading of biomass-derived platform chemicals towards highly valuable products is important for the sustainable ***,the efficient electrocatalytic oxidation of biomass-derived furfuryl alcohol(FFA)into furoic acid(FurAc)catalyzed by the electrodeposited non-precious NiFe microflowers was successfully reached under the low temperature and ambient *** 3D hierarchical NiFe microflowers assembled from ultrathin nanosheets were controllably synthesized by the electrodeposition method and uniformly grown on carbon fiber paper(CFP).Electrochemical analysis confirmed that NiFe nanosheets more preferred in the selective oxidation of FFA(FFAOR)than oxygen evolution reaction(OER).The linear sweep voltammetry(LSV)in FFAOR displayed a clear decrease towards lower potential,resulting in 30 mV reduction of overpotential at 20 mA cm^(-2) compared with that of *** optimal catalyst Ni_(1)Fe_(2) nanosheets exhibited the highest selectivity of FurAc(94.0%)and 81.4%conversion of FFA within 3 ***,the influence of various reaction parameters on FFAOR was then explored in *** that,the reaction pathway was investigated and rationally *** outstanding performance for FFAOR can be ascribed to the unique structure of 3D flower-like NiFe nanosheets and oxygen vacancies,resulting in large exposure of active sites,faster electron transfer and enhanced adsorption of *** findings highlight a facile and convenient mean with a promising green future,which is promising for processing of various biomass-derived platform chemicals into value-added products.

关键词： Electrodeposition Microflowers assembled by nanosheets NiOOH Oxygen vacancies Electrochemical oxidation Furfuryl alcohol Furoic acid

Fault Diagnosis Scheme for Railway Switch Machine Using Multi-Sensor Fusion Tensor Machine

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Computers, Materials & Continua 2024年第6期79卷 4533-4549页

作者： Chen Chen Zhongwei Xu Meng Mei kai Huang siu Ming Lo School of Electronic and Information Engineering Tongji UniversityShanghai201804China Department of Architecture and Civil Engineering City University of Hong KongHong KongChina School of Computer Engineering Jimei UniversityXiamen361021China

Railway switch machine is essential for maintaining the safety and punctuality of train operations.A data-driven fault diagnosis scheme for railway switch machine using tensor machine and multi-representation monitoring data is developed *** existing methods,this approach takes into account the spatial information of the time series monitoring data,aligning with the domain expertise of on-site manual ***,a multi-sensor fusion tensor machine is designed to improve single signal data’s limitations in insufficient ***,one-dimensional signal data is preprocessed and transformed into two-dimensional ***,the fusion feature tensor is created by utilizing the images of the three-phase current and employing the CANDE-COMP/PARAFAC(CP)decomposition ***,the tensor learning-based model is built using the extracted fusion feature *** developed fault diagnosis scheme is valid with the field three-phase current *** experiment indicates an enhanced performance of the developed fault diagnosis scheme over the current approach,particularly in terms of recall,precision,and F1-score.

关键词： Railway switch machine tensor machine fault diagnosis

Improving the Catalytic Activity of Au25 Nanocluster by Peeling and Doping

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Chinese Journal of Chemistry 2017年第5期35卷 567-571页

作者： man-bo Li Shi-kai Tian Zhikun Wu Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology CAS Center for Excellence in Nanoscience Institute of Solid State Physics Chinese Academy of Sciences Hefei Anhui 230031 China Department of Chemistry University of Science and Technology of China Hefei Anhui 230026 China

Tuning the nanoclusters＇ compositions and structures is critical for the performance improvement of ***,a well-known Au25（SCH2CH2Ph）18 （Au25 for short） nanocluster has been transformed to a rare cadmium doped gold nanocluster [Au13Cd2（PPh3）6（SC2H4Ph）6（NO3）2]2Cd（NO3）4 （Au26Cd5 for short） by peeling and *** Au25 exhibits no catalytic activity toward A3-coupling reaction under the investigated conditions,the novel cadmium doped gold nanocluster Au26Cd5 shows high catalytic activity,as well as good recyclability and substrate tolerance for the same *** high catalytic activity is attributed to the cooperation between the exerted cadmium atoms and the neighbor gold atoms on the surface of Au13 *** work has important implication for the tuning of nanoclusters＇ compositions and structures targeting the improvement of catalytic performance by some unusual but effective strategies.

关键词： peeling doping gold nanocluster A^3-coupling reaction catalysis

A middle-aged lady with a pyogenic liver abscess caused by Clostridium perfringens

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World Journal of Hepatology 2012年第8期4卷 252-255页

作者： siu-Tong Law Ming kai Lee Division of Gastroenterology and Hepatology Department of Medicine and GeriatricsTuen Mun HospitalTuen MunHong KongChina

The pyogenic liver abscess caused by Clostridium perfringens (C. perfringens ) is a rare, but rapidly fatal infection. It is usually associated with malignancy and immunosuppression. We report the case of 50-year-old lady with the secondary liver metastases from rectal cancer presented with fever and epigastric pain. The identification of Grampositive bacilli septicaemia, the presence of gas-forming liver abscess and massive intravascular hemolysis should lead to the suspicion of C. perfringens infection. Here we review twenty cases published since 1990 and their clinical features are discussed. The importance of "an aggressive treatment policy" with multidisciplinary team approach is emphasized.

关键词： Pyogenic liver abscess Clostridium perfringens Infected hepatic metastases Liver abscess Gram-positive bacilli septicaemia

Comparison of ocular biometry in Chinese patients using two swept-source optical coherence tomography devices

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Annals of Eye Science 2023年第3期8卷 59-69页

作者： Vivian Wing-man Ho Hong Chau Nguyen siu-Hong Wong Anita Lai-Wah Li Kenneth kai Wang Li Department of Ophthalmology United Christian HospitalKwun TongHong Kong SARChina Department of Ophthalmology Tseung Kwan O HospitalHong Kong SARChina Department of Ophthalmology School of Clinical MedicineLKS Faculty of MedicineThe University of Hong KongHong Kong SARChina

Background:To compare two swept-source optical coherence tomography(SS-OCT)biometers,IOLMaster 700 and ***:This is a retrospective *** measurements of cataract patients performed between March and July 2021 in the Department of Ophthalmology,United Christian Hospital,Hong Kong,were *** scheduled for cataract surgery were measured with both SS-OCT devices on the same *** following biometry parameters were compared:keratometry(K),total keratometry(TK),axial length(AL),central corneal thickness(CCT),anterior chamber depth(ACD),lens thickness(LT),white-to-white(WTW)and the predicted intraocular lens(IOL)power to achieve *** assess the agreement between the devices,Bland-Altman analysis with 95%limits of agreement(LoA)were ***:In total,92 eyes of 47 subjects were measured with both *** were statistically significant differences between the two biometers for most measurements(P<0.05)except for flat K,AL and IOL power when using the right eyes for *** the left eyes,there were statistically significant differences in the measurements from the two biometers in all parameters except for flat and steep *** ANTERION did not obtain ACD,AL and LT in 2(2.17%),1(1.09%)and 5 cases(5.43%)***:The two biometers showed a clinically acceptable agreement in most *** showed significant differences in most parameters but not clinically relevant except for the TK and WTW,and these two parameters should not be used interchangeably between the devices.

关键词： Ocular biometry cataract swept-source optical coherence ANTERION IOLMaster 700