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Journal of Semiconductors 2023年第9期44卷 47-56页

作者： man Hoi wong Department of Electronic and Computer Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

β-Ga_(2)O_(3) Schottky barrier diodes have undergone rapid progress in research and development for power electronic *** paper reviews state-of-the-art β-Ga_(2)O_(3) rectifier technologies,including advanced diode architectures that have enabled lower reverse leakage current via the reduced-surface-field *** device properties including onresistance,breakdown voltage,rectification ratio,dynamic switching,and nonideal effects are summarized for the different *** results on the high-temperature resilience of β-Ga_(2)O_(3) Schottky diodes,together with the enabling thermal packaging solutions,are also presented.

关键词： β-Ga_(2)O_(3) Schottky diodes power device edge termination nickel oxide

Low-temperature metal–oxide thin-film transistor technologies for implementing flexible electronic circuits and systems

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Journal of Semiconductors 2023年第9期44卷 3-10页

作者： Runxiao Shi Tengteng Lei Zhihe Xia man wong State Key Laboratory of Advanced Displays and Optoelectronics and Technologies Department of Electronic and Computer EngineeringThe Hong Kong University of Science and TechnologyHong KongChina

Here we review two 300℃metal–oxide(MO)thin-film transistor(TFT)technologies for the implementation of flexible electronic circuits and ***-enhanced TFTs for suppressing the variation and shift of turn-on voltage(VON),and dual-gate TFTs for acquiring sensor signals and modulating VON have been deployed to improve the robustness and performance of the systems in which they are *** circuit building blocks based on fluorinated TFTs have been designed,fabricated,and characterized,which demonstrate the utility of the proposed low-temperature TFT technologies for implementing flexible electronic *** construction and characterization of an analog front-end system for the acquisition of bio-potential signals and an active-matrix sensor array for the acquisition of tactile images have been reported recently.

关键词： flexible electronics metal-oxide semiconductor thin-film transistor dual gate fluorination analog front-end system sensors

Synthesis and enhanced piezoelectric response of CVD-grown SnSe layered nanosheets for flexible nanogenerators

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Nano Research 2023年第9期16卷 11839-11845页

作者： Fumei Yang man-Chung wong Jianfeng Mao Zehan Wu Jianhua Hao Department of Applied Physics the Hong Kong Polytechnic UniversityHong Kong 999077China

Piezoelectricity is the electric charge which accumulates in certain materials in response to mechanical stimuli,while piezoelectric nanogenerators(PENGs)converting mechanical energy into electricity can be widely used for energy harvesting and self-powered *** group IV-VI monochalcogenides may exhibit strong piezoelectricity because of their puckered C_(2v)symmetry and electronic structure,making them promising for flexible ***,we investigated the synthesis and piezoelectric properties of multilayer SnSe nanosheets grown by chemical vapor deposition(CVD).The SnSe nanosheets exhibited high single-crystallinity,large area,and good *** strong layer-dependent in-plane piezoelectric coefficient of SnSe nanosheets showed a saturated trend to be~110 pm/V,which overcomes the weak piezoelectric response or odd-even effects in other layered nanosheets.A high energy conversion efficiency of 9.3%and a maximum power density of 538 mW/cm^(2)at 1.03%strain have been demonstrated in a SnSe-based *** on the enhanced piezoelectricity of SnSe and attractive output performance of the nanogenerator,a self-powered sensor for human motion monitoring is further *** results demonstrate the strong piezoelectricity in high quality CVD-grown SnSe nanosheets,allowing for application in flexible smart piezoelectric sensors and advanced microelectromechanical devices.

关键词： SnSe piezotronics piezoresponse force microscope piezoelectric nanogenerator self-powered device

Ignition Pattern Analysis for Automotive Engine Trouble Diagnosis Using Wavelet Packet Transform and Support Vector Machines

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Chinese Journal of Mechanical Engineering 2011年第5期24卷 870-878页

作者： VONG Chi-man wong Pak-kin TAM Lap-mou ZHANG Zaiyong Department of Computer and Information Science Faculty of Science and Technology University of Macao Macao China Department of Electromechanical Engineering Faculty of Science and Technology University of Macao Macao China

Engine spark ignition is an important source for diagnosis of engine *** on the waveform of the ignition pattern,a mechanic can guess what may be the potential malfunctioning parts of an engine with his/her experience and ***,this manual diagnostic method is imprecise because many spark ignition patterns are very ***,a diagnosis needs many trials to identify the malfunctioning *** the mechanic needs to disassemble and assemble the engine parts for *** tackle this problem,an intelligent diagnosis system was established based on ignition ***,the captured patterns were normalized and *** wavelet packet transform（WPT） was employed to extract the representative features of the ignition ***,a classification system was constructed by using multi-class support vector machines（SVM） and the extracted *** classification system can intelligently classify the most likely engine fault so as to reduce the number of diagnosis *** results show that SVM produces higher diagnosis accuracy than the traditional multilayer feedforward neural *** is the first trial on the combination of WPT and SVM to analyze ignition patterns and diagnose automotive engines.

关键词： automotive engine ignition pattern diagnosis pattern classification wavelet packet transform support vector machines.

Design, Synthesis and Ring-Opening Properties of a New Bipyridine Fused Rhodamine-Like Chelating Ligand and the Related Transition Metal Complexes

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Chinese Journal of Chemistry 2021年第6期39卷 1659-1666页

作者： Zhiyuan Qian Yukun Cheng Shunan Zhao Keith man-Chung wong Department of Chemistry Southern University of Science and TechnologyNo.1088Tangchang BoulevardNanshan District，ShenzhenGuangdong 518055China

A new bipyridine fused rhodamine-like chelating ligand and the corresponding transition metal complexes of platinum(Ⅱ)and iridi-um(Ⅲ)have been designed,synthesized and structurally characterized by X-ray *** photophysical properties and acid-or metal ion-promoted spirocarbon ring-opening properties have been *** platinum(Ⅱ)and iridium(Ⅲ)complexes show a drastic color change in solution with Hg^(2+) ions and emergency of an absorption band at around 450-600 nm,assignable to the absorption band of the ring-opened rhodamine-like *** platinum(Ⅱ)complex was suggested to undergo dissociation with Hg^(2+) ion,based on the corresponding absorption titration *** titration studies of iridium(Ⅲ)complexes were found to suffer from the quenching process,probably due to the presence of a lower-lying non-emissive excited state from the ring-opened form of ligand.

关键词： Rhodamine Transition metals Sensor Luminescence Bipyridine

Synthesis and blue light-emitting properties of 4,4'-bis(diphenylamino)-quinque(p-phenyl)s

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Chinese Chemical Letters 2007年第7期18卷 823-826页

作者： Zhong Hui Li Mo Jun Xiong man Shing wong Department of Chemistry Sichuan College of Education Chengdu 610041 China West China School of Pharmacy Sichuan University Chengdu 610041 China Department of Chemistry Hong Kong Baptist University Hong Kong China

An excellent organic blue light-emitting diode based on 4,4＇-bis（diphenylamino）-quinque（p-phenylene）s （OPP（5）-NPh） with a maximum luminance of up to 5000 cd/m^2 and a luminanous efficiency of 1.3 cd/A was reported. This diode was made by using a wide band-gap hole-blocking layer, F-TBB instead of PBD in the OLED devices. We attribute the good performance to the one trade-off involved in the use of F-TBB to obtain higher luminance is the increased turn-on voltages and slightly decreased device efficiencies.

关键词： 4,4'-Bis(diphenylamino)-quinque(p-phenylene)s Synthesis Organic light-emitting diode (OLED) Optical properties

Synergetic analysis of springtime air pollution episodes over Gwangju,Korea

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Journal of Environmental Sciences 2017年第7期29卷 270-283页

作者： Sung-Kyun Shin Kwon-Ho Lee Seung-Shik Park man Sing wong Research Institute for Radiation-Satellite(RIRS) Gangneung-Wonju National University(GWNU)Gangneung 25457Republic of Korea Department of Atmospheric and Environmental Sciences(DAES) Gangneung-Wonju National University(GWNU)Gangneung 25457Republic of Korea Department of Environment and Energy Engineering Chonnam National UniversityGwangju 61186Republic of Korea Department of Land Surveying and Geo-Informatics The Hong Kong Polytech UniversityKowloonHong Kong

The characteristics of springtime aerosols,including their optical and microphysical properties,were analyzed for the months of March to May of 2009 in Gwangju（35.23°N,126.84°E）,Korea.A high Light Detection and Ranging（LIDAR）-derived aerosol depolarization ratio（δ） of 0.25 ± 0.04 was determined on dust particles during the observation ***？ngstr？m exponent values of the 440–870 nm wavelength pair（？_（440–870）） and single-scattering albedo at 675 nm（Ω_（675）） measured by a CIMEL sun/sky radiometer were 0.77 ± 0.19 and 0.95 ±0.01,*** elevated dust layers reached a maximum elevation of 4 km above sea ***/smoke particles that originated from highly populated/industrialized regions could be distinguished by their relatively smaller particle size（？_（440–870） ranged between1.33 and 1.36） and higher light-absorbing（Ω_（675） of 0.92 ± 0.01） *** aerosols are mostly distributed at altitudes 〈 1.2 *** root-mean-square deviation（RMSD） between the aerosol optical depth（AOD,τ） derived from LIDAR_（（τ_（LIDAR））） and from the CIMEL sun/sky radiometer_（（τ_（CIMEL））） varied with respect to the surface PM10 *** RMSD between τ_（LIDAR） and τ_（CIMEL） was as low as 13% under lower PM_（10） concentration levels（〈 100 μg/m^3）.In contrast,the RMSD between τ_（LIDAR） and τ_（CIMEL） increased three times（~31%） under high surface PM_（10） concentration levels（〉100 μg/m^3）.These results suggest that the accuracy of τ_（LIDAR） is influenced by specific atmospheric conditions,regardless of its uncertainty.

关键词： LIDAR Sun/sky radiometer MODIS Optical/microphysical properties Aerosol optical depth

Design, Synthesis, Photophysical Studies and Electrochemistry of Carbazole-, Oxadiazole-, and Oxadiazole-Triarylamine-Containing Rhenium(Ⅰ) Diimine Alkynyl Complexes

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Chinese Journal of Chemistry 2014年第10期32卷 1015-1021页

作者： Wai-Kin Chung Keith man-Chung wong Vivian Wing-Wah Yam and Department of ChemistryThe University of Hong KongPokfulam RoadHong KongChina

A series of rhenium(I)diimine alkynyl complexes with various electron-and hole-transporting moieties has been synthesized and *** electronic absorption,emission and electrochemical properties have also been studied.

关键词： electrochemistry luminescence metal alkynyl rhenium(Ⅰ)diimine,UV/Vis spectroscopy

Transfusion-transmitted hepatitis E:What we know so far?

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World Journal of Gastroenterology 2022年第1期28卷 47-75页

作者： Carmen Ka man Cheung Sunny Hei wong Alvin Wing Hin Law man Fai Law Medicine and Therapeutics Prince of Wales HospitalHong Kong 852China Institute of Digestive Disease and Department of Medicine and Therapeutics the Chinese University of Hong KongHong Kong 852China Lee Kong Chian School of Medicine Nanyang Technological UniversitySingapore 639798Singapore West Island School Hong Kong 852China

Hepatitis E virus(HEV)is a major cause of viral hepatitis *** is growing concern about transfusion-transmitted HEV(TT-HEV)as an emerging global health *** can potentially result in chronic infection in immunocompromised patients,leading to a higher risk of liver cirrhosis and even *** 0.0013%and 0.281%of asymptomatic blood donors around the world have HEV viremia,and 0.27%to 60.5%have anti-HEV immunoglobulin *** is infectious even at very low blood concentrations of the *** patients who develop persistent hepatitis E infection should have their immunosuppressant regimen reduced;ribavirin may be considered as *** interferon can be considered in those who are refractory or intolerant to ***,a nucleotide analog,showed modest antiviral activity in some clinical studies but sustained viral response was not ***,rescue treatment remains an unmet *** need for HEV screening of all blood donations remains *** screening has been adopted in some countries after consideration of risk and resource *** pathogen reduction methods have also been proposed to reduce the risk of *** studies are needed to define the incidence of transmission through transfusion,their clinical features,outcomes and prognosis.

关键词： Hepatitis E virus Acute and chronic hepatitis Immunosuppression Blood transfusion Transplantation