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Particulate problems of different occupational environments in Hong kong

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Journal of Environmental Sciences 1999年第4期11卷 385-391页

作者： leung Y.C., CHEUNG k.k. (Department of Mechanical Engineering, The University of Hong kong, Hong kong Special Administrative Region) 香港大学机械工程系香港

This paper studied the air pollution problems that occurred in various working environments in Hong kong through questionnaire survey and field measurements. Results of the survey showed that more than half of the respondents, who were affected by different kinds of air pollution, were suffering from either eye and nasal allergies, or throat irritation. Many of them recognized dust particulate to be the most serious air pollutant in their working environments. A portable laser dust monitor was employed to measure the levels of dust particulate that would be inhaled by people of different occupations and subject to different environments. The measurement results revealed that only some occupations were exposed to unacceptably high particulate levels. Generally, the particulate levels of most of the studied working environments, catering premises and entertainment places were much lower than the ambient levels and unlikely to pose any occupational hygiene problems.

关键词： air pollution dust particulate Hong kong

Optical and thermal performance analysis of aerogel glazing technology in a commercial building of Hong kong

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能源与人工环境(英文) 2020年第2期1卷 215-223页

作者： C.k.leung L.Lu Y.Liu H.S.Cheng Jeff H.Tse Department of Building Services Engineering The Hong Kong Polytechnic UniversityZS850Block ZHung HomKowloonHong KongChina College of Civil Engineering Hunan UniversityChangshaHunan 410082China Electrical and Mechanical Services Department HKSARHong KongChina

improving the thermal insulation of glazing units is a common strategy of reducing building energy use for spacing *** paper newly examined the application of aerogel glazing technology in Hong kong by the means of laboratory testing and *** prototypes of granular aerogel glazing were selected to examine their optical properties,and the measured optical properties of aerogel were used to calculate the total window thermal performance indices.A typical 40-story commercial office building was chosen for energy simulation to compare the thermal performance of aerogel glazing with different glazing technologies in Hong *** results showed that aerogel glazing could achieve the promising reduction of window heat gain up to 57%and cooling energy up to 8.5%compared with double *** heat insulation performance of aerogel glazing is even better than the double glazing with low-E coating in Hong ***,aerogel glazing can be a good alternative of glazing to comply with the existing local Overall Thermal Transfer Value(OTTV)requirement and to reduce the building energy use for space cooling in Hong kong and other regions.

关键词： Glazing technology Aerogel glazing Building energy saving

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复合材料梁修复层脱落的光纤检测技术

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

The effect of downstream resistance on flow diverter treatment of a cerebral aneurysm at a bifurcation: A joint computational-experimental study

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Journal of Hydrodynamics 2018年第5期30卷 803-814页

作者： ANDerson C.O.Tsang Billy Y.S.Yiu Abraham Y.S.Tang W.C.Chung Gilberto k.k.leung AlexANDer k.k.Poon Alfred C.H.Yu Simon S.M.Lai k.W.Chow Department of Surgery Li Ka Shing Faculty of Medicine University of Hong Kong Department of Electrical and Computer Engineering University of Waterloo Department of Mechanical Engineering University of Hong Kong Department of Electrical and Electronic Engineering University of Hong Kong

intracranial aneurysm can lead to hemorrhagic stroke upon rupture. Deployment of flow diverters can restrict the blood flow into aneurysm and mitigate the rupture risk. Computational fluid dynamics（CFD） and ultrasonography with pulse-wave and color Doppler ultrasound measurements were employed jointly to investigate the complex flow pattern in cerebral aneurysms, both before and after the deployment of flow diverters. Patient-specific configurations of both bifurcation and side-wall aneurysms were selected. The effect of downstream flow resistance was investigated by adjusting the volume flow rate and pressure at the outlet vessels computationally and experimentally. Velocity profiles in the aneurysm measured from ultrasonography showed good agreement with those from computer simulations. The discrepancy in velocity between the computational and experimental sets of data is less than 10%. The downstream resistance can alter the volume flux into a bifurcation aneurysm with a flow diverter deployed by 236%, while the corresponding value of a side-wall aneurysm is negligible. The vorticity of the aneurysmal flow was reduced by more than 80% in both cases after stenting. This study demonstrated that careful investigation of downstream flow resistance of a bifurcation aneurysm is essential to provide an accurate assessment of the aneurysmal flow dynamics after flow diverter deployment.

关键词： intracranial aneurysms computational fluid dynamics (CFD) doppler ultrasound

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水泥基材料断裂性能与微孔结构研究

建筑材料学报 2011年第4期14卷 523-527页

作者：庞超明 leung C.k.Y. 孙伟徐剑东南大学材料科学与工程学院江苏南京211189 东南大学江苏省土木工程材料重点实验室江苏南京211189 香港科技大学土木工程与环境系江苏省交通科学研究院股份有限公司长大桥梁健康检测与诊断交通行业重点实验室江苏南京211112

以高掺量粉煤灰HDCC配合比为基础,测试了不同龄期基体的抗压强度、断裂韧度,同时采用MiP测试了其微孔结构.结果表明:养护28d主要改善基体大于50nm的大毛细孔结构,养护28d后再热养护7d主要改善其小于200nm的微孔分布,而养护28d后再继续... 详细信息

以高掺量粉煤灰HDCC配合比为基础,测试了不同龄期基体的抗压强度、断裂韧度,同时采用MiP测试了其微孔结构.结果表明:养护28d主要改善基体大于50nm的大毛细孔结构,养护28d后再热养护7d主要改善其小于200nm的微孔分布,而养护28d后再继续热养护7d以上则仅仅改善其小于20nm的微孔分布,且改善效果不大;龄期、水胶比、粉煤灰品种及其掺量对基体抗压强度的影响大于它们对断裂韧度的影响,粉煤灰品种对抗压强度影响较大,但对断裂韧度的影响很小;断裂韧度与孔隙率的相关性大大低于抗压强度与孔隙率,如果在相关关系的拟合曲线中考虑小于20nm微孔含量的影响,则置信水平可大大提高.

关键词：水泥基复合材料微孔分布微观性能

Long-term survival after intraluminal brachytherapy for inoperable hilar cholangiocarcinoma: A case report

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World Journal of Gastroenterology 2005年第20期11卷 3161-3164页

作者： Siu-Yin Chan Ronnie T. Poon kelvin k. Ng Chi-leung Liu Raymond T. Chan Sheung-Tat Fan Centre for the Study of Liver Disease and Department of Surgery The University of Hong kong PokfulamHong Kong China Department of Clinical Oncology The University of Hong kong Pokfulam Hong Kong China

Surgical resection with a tumor-free margin is the onlycurative treatment for hilar cholangiocarcinoma (klatskin tumor). However, over half of the patients present late with unresectable tumors. Radiotherapy using external beamirradiation or intraluminal brachytherapy (iLBT) has been used to treat unresectable hilar cholangiocarcinoma with satisfactory outcome. We reported a patient with unresectable hilar cholangiocarcinoma surviving more than 6 years after combined external beam irradiation and iLBT.

关键词： Brachytherapy Hilar cholangiocarcinoma

A randomized controlled trial of topical tea tree preparation for MRSA colonized wounds

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international Journal of Nursing Sciences 2014年第1期1卷 7-14页

作者： Rainbow L.P.Lee Polly H.M.leung Thomas k.S.Wong School of Nursing The Hong Kong Polytechnic UniversityHong Kong Department of Health Technology and informatics The Hong Kong Polytechnic UniversityHong Kong Faculty of Health and Social Sciences The Hong Kong Polytechnic UniversityHong Kong

Background:The prevalence of MRSA(Methicillin-resistant Staphylococcus aureus)colonized wounds in home care residents is expected to grow continuously as a result of the substantial proportion of older people requiring institutionalized care due to chronic disease and declining functional status,which contribute to more frequent skin breakdown and wound *** tree oil has been claimed to have anti-bacterial,analgesic and anti-inflammatory effects that have been suggested in many in-vitro studies to have good efficacy against *** aims of this study were to evaluate the effectiveness of 10%topical tea tree preparation to eradicateMRSA and to ascertain its influence on wound healing forMRSA-colonized ***:it was a randomized controlled trial,single-blind *** with stage ii or above MRSA-colonized wounds and who had given their informed consent formed the *** determined sample sizewasbasedonthe effect size of our previouspilot study,whichwas *** outcome measurements were taken for the MRSA bacterial count and wound healing condition at baseline and at 1-week.intervals during the 4-week dressing intervention ***:Thirty-two participants were recruited from two non-government nursing homes,16 in the control group and 16 in the tea tree oil *** control group residents received routine saline gauze dressing,while the tea tree oil group residents received the 10%topical tea tree preparation *** the tea tree oil group,all chronic wounds that had previously been delayed in healing were healed within 28 days without adverse *** was also completely eradicated in 14(87.5%)out of 16 wounds in the group receiving the 10%topical tea tree preparation.

关键词： MRSA Topical tea tree preparation Wounds

Nitrogen-doped carbon nanotube-encapsulated nickel nanoparticles assembled on graphene for efficient CO2 electroreduction

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Chinese Chemical Letters 2020年第6期31卷 1438-1442页

作者： Tingting Wang Jian Yang Jiayi Chen Qinggang He Zhongjian Li Lecheng Lei Jianguo Lu Michael k.H.leung Bin Yang Yang Hou key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China institute of Zhejiang University-Quzhou Quzhou 324000China State key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Ability R&D Energy Research Centre(AERC) School of Energy and EnvironmentCity University of Hong KongHong Kong 999077China Ningbo Research institute Zhejiang UniversityNingbo 315100China

Exploring 3 D hybrid nanocarbons encapsulated with metal nanoparticles(NPs)are recently considered as emerging catalysts for boosting CO2 electroreduction reaction(CRR)under practical and economic ***,we report a one-step pyrolysis strategy for fabricating N-doped carbon nanotube(CNT)-encapsulated Ni NPs assembled on the surface of graphene(N/NiNPs@CNT/G)to efficiently convert CO2 into *** such 3 D hybrid,the particle size of Ni NPs that coated by five graphitic carbon layers is less than 100 nm,and the amount of N dopants introduced into graphene with countable CNTs is determined to 7.27 at%.Thanks to unique CNT-encapsulated Ni NPs structure and N dopants,the achieved N/NiNPs@CNT/G hybrid displays an exceptional CRR activity with a high Faradaic efficiency of 97.7%and large CO partial current density of 7.9 mA/cm2 at-0.7 V,which outperforms those reported metallic NPs loaded carbon based CRR ***,a low Tafel slope of 134 mV/dec,a turnover frequency of 387.3 CO/h at-0.9 V,and tiny performance losses during long-term CRR operation are observed on N/NiNPs@CNT/*** observations illustrate that the Ni NPs encapsulated by carbon layers along with N dopants are of great importance in the conversion of CO2 into CO with high current density.

关键词： CO2 electroreduction Graphene nanosheets Ni nanoparticles N dopants 3D hybrid

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染料敏化分解水制氢技术进展

电源技术 2006年第10期30卷 856-859页

作者：倪萌 leung MiCHAEL k H leung DENNiS Y C 香港大学机械工程系

介绍了染料敏化分解水制氢的基本原理。综述了染料分子的选取,使用氧化还原调节剂的机理和研究进展。指出染料分子对光谱的吸收特性,激发态染料分子能级与半导体导带的相对位置,染料分子与半导体的吸附情况,表面键合强度直接影响对光子... 详细信息

介绍了染料敏化分解水制氢的基本原理。综述了染料分子的选取,使用氧化还原调节剂的机理和研究进展。指出染料分子对光谱的吸收特性,激发态染料分子能级与半导体导带的相对位置,染料分子与半导体的吸附情况,表面键合强度直接影响对光子的吸收,电子的注入,从而影响产氢量。此外,i-/i3-作为氧化还原调节剂可有效还原染料分子,实现持续产氢。最后提出了染料敏化分解水制氢的间歇式反应器结构,以及通过选择用于敏化的半导体来提高产氢率的思路。

关键词：染料敏化制氢光催化可再生能源