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香港对于结核病的接触者检查是有用的

国际结核病与肺部疾病杂志 2002年第2期 55-59页

作者： K.Noertjojo C.m.Tam S.L.chan J.Tan m.chan-yeung 王延莉 Department of medicine The University of Hong Kong Hong Kong Government Tuberculosis and Chest Service Department of Health Hong Kong Department of Health Care and Epidemiology University of British Columbia Vancouver Canada Department of medicine The University of Hong Kong

背景:香港政府结核病与胸部疾病中心的结核病控制规程。目的:确定香港对结核病家庭接触者的检查结果。设计:从在胸部疾病中心登记治疗的5757例中随机选择970首发病例,对其所有家庭接触者进行回顾性队列研究。结果:在确定的2678名家... 详细信息

背景:香港政府结核病与胸部疾病中心的结核病控制规程。目的:确定香港对结核病家庭接触者的检查结果。设计:从在胸部疾病中心登记治疗的5757例中随机选择970首发病例,对其所有家庭接触者进行回顾性队列研究。结果:在确定的2678名家庭接触者(首发病例的3倍)中,检查率为90％;发现41例活动性病例,比率为1720/100000(95％CI1238-2329)。比率在两端年龄组最高,≤5岁的儿童组为3604/100000(95％CI 990-3615),在>60岁年龄组的人群中为3547/100000(95％CI 1456-6489)。痰涂片和培养阳性的首发病例其接触者病例率最高,为2904/100000(95％CI 1869-4873);但细菌学为阴性病人的接触者病例率也高,为1478/100000(95％CI678-2789)。通过接触者追踪确定的阳性病例可能是源病例而不是继发病例。≤5岁的儿童结核菌素为阳性为8％,香港对所有的新生儿都予BCG接种,在过去的30年覆盖率为99％,很难估算这些儿童的感染率。结论:香港作为结核病的中等负担地区,对接触者进行调查是主动发现活动性病例的一个非常有效的措施。

关键词：接触者检查结核病香港

香港新生儿卡介苗接种队列实施卡介苗复种规程的效果

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国际结核病与肺部疾病杂志 2002年第1期 2-7页

作者： C.C.Leung C.m.Tam S.L.chan m.chan-yeung C.K.chan K.C.chang 王海东 TB and Chest Service Department of Health Department of medicine The University of Hong Kong Hong Kong SAR China

背景:香港对结核菌素阴性的在校儿童进行卡介苗复种成为常规。目的:应用结核菌素皮试评定卡介苗复种的效果。方法:通过发生活动性结核病的登记报告随访一钮在出生时接种卡介苗的303692名儿童。以香港卫生局的接种统计,评估小学参加卡... 详细信息

背景:香港对结核菌素阴性的在校儿童进行卡介苗复种成为常规。目的:应用结核菌素皮试评定卡介苗复种的效果。方法:通过发生活动性结核病的登记报告随访一钮在出生时接种卡介苗的303692名儿童。以香港卫生局的接种统计,评估小学参加卡介苗复种规程的队列百分比。通过接种卡和门诊记录来确定儿童的卡介苗复种史。结果:队列中参加卡介苗复种规程的有85.2％;参与者中的79.7％结核菌素阴性并复种;343人在11岁后发展为结核病;参与者除41人离开外,其余302人均在规程中。参与者和未参与者的结核病发病率分别为16.5和12.9每100000人年(RR 1.28,95％CI 0.92-1.77)。在参与者中,结核菌素阴性/卡介苗复种组和结核菌素阳性/未复种组的结核病发病率分别是12.5和32.0每100000人年(RR 0.39,95％CI 0.31-0.49)。结论:本研究未能证明学校卡介苗复种规程的参与者与未参与者间在结核病发病率上有显著性差异。结核菌素阳性组结核病危险的增加不支持使用结核菌素试验来检测新生儿卡介苗接种产生的免疫。

关键词：卡介苗结核菌素复种效果

哮喘专题研讨会由IUATLD组织的专题研讨会报告(2000.12巴黎)

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国际结核病与肺部疾病杂志 2002年第1期 30-34页

作者： N.At-Khaled D.A.Enarson N.Behbehani m.chan yeung E.Irisen 马玙 International Union Against Tuberculosis and Lung Disease Paris France

经过5年的运作后,国际防痨及肺病联合会(下简称IUATLD)哮喘组于2000年12月15-16日在巴黎IUATLD总部举行专题研讨会,以评估既往工作,决定今后的工作计划。以上届Ann Woolcock的远见卓识及努力,IUATLD哮喘组于1995年由呼吸病处分出独立... 详细信息

经过5年的运作后,国际防痨及肺病联合会(下简称IUATLD)哮喘组于2000年12月15-16日在巴黎IUATLD总部举行专题研讨会,以评估既往工作,决定今后的工作计划。以上届Ann Woolcock的远见卓识及努力,IUATLD哮喘组于1995年由呼吸病处分出独立开展活动。

关键词：哮喘气喘病阻塞性肺疾病 IUATLD 专题研讨会巴黎法国

A novel reductive ring-opening reaction of isoxazolidine to form functionalized 1,3-aminoalcohol

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Chinese Chemical Letters 2007年第6期18卷 629-632页

作者： Wing Hong chan Albert W.m. Lee Wai yeung Wong Department of Chemistry Hong Kong Baptist University Kowloog Tong Hong Kong

Reductive cleavage of the NO bond of isoxazolidine ring with catalytic hydrogenation over Raney nickel was described. Bicyclic isoxazolidines could be effectively converted into the corresponding 1,3-amino-alcohol possessing a sultone or sultam moiety with high conversion and yield when the hydrogenation was catalyzed by freshly prepared Raney nickel under a pressure of 40 psi in the presence of triethylamine.

关键词： Isoxazolidine Hydrogenation Raney nickel 1,3-Amino-alcohol

Sorption of Perfluorooctane sulfonate(PFOS) including its isomers on hydrargillite as a function of pH,humic substances and Na2SO4

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Journal of Environmental Sciences 2022年第1期34卷 263-272页

作者： Jean-Noel Uwayezu Leo W.Y.yeung mattias Bäckström man-Technology-Environment Research Centre(mTm) Örebro University70182ÖrebroSweden

Perfluorooctane sulfonate(PFOS)is a persistent organic pollutant(POP)and emergent contaminant that are widespread in the *** the m.chanisms controlling the distribution of PFOS and its isomers between hydrargillite and the water phase is important in order to study their redistribution and mobility in the *** study investigated the effects of pH,humic acid,fulvic acid and Na_(2)SO_(4) on sorption of PFOS isomers to hydrargillite.A mixture of PFOS isomers was spiked into water and hydrargillite was added to the system and shaken for one day;the system was tested with different aqueous *** of PFOS isomers in the aqueous phase were quantified using an ultra-performance liquid chromatograph coupled to a triple quadrupole mass *** results showed that the distribution coefficients of PFOS isomers were found to be 0.76,0.71,0.93 and 0.90 at pH 6.5,for 3-/4-/5-PFOS,6-/2-PFOS,L-PFOS and total PFOS *** distribution coefficients increased at lower pH and decreased at alkaline *** presence of humic substances(HS)increased the sorption slightly at the environmental pH of 6.5,although a competition effect was observed during acidic conditions.A tendency of PFOS distribution to hydrargillite in the presence of Na_(2)SO_(4) was like its behavior in the presence of HS although the m.chanisms behind the sorption were interpreted *** study revealed that L-PFOS was readily sorbed when no other chemicals were added or in 20 mg/L FA or 100 mg/L Na_(2)SO_(4).We suggest that an increase in PFOS sorption in the presence of HS may be due to hydrophobic m.chanisms while Na_(2)SO_(4) contributed to increased sorption through ionic strength effects.

关键词： Hydrargillite Perfluorooctane sulfonate Sorption Humic substances Electrostatic,Ionic strength

mL(n)BiCGStab: Reformulation, Analysis and Implementation

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Numerical mathematics(Theory,methods and Applications) 2012年第3期5卷 447-492页

作者： man-Chung yeung Department of mathematics University of WyomingLaramieWY 82071USA

With the aid of index functions,we re-derive the mL(n)BiCGStab algorithm in[yeung and chan,SIAm ***.,21(1999),pp.1263-1290]*** are n ways to define the mL(n)BiCGStab residual *** definition leads to a different mL(n)BiCGStab *** demonstrate this by presenting a second algorithm which requires less *** theory,this second algorithm serves as a bridge that connects the Lanczos-based BiCGStab and the Arnoldi-based FOm while mL(n)BiCG is a bridge connecting BiCG and *** also analyze the breakdown situation from the probabilistic point of view and summarize some useful properties of mL(n)*** issues are also addressed.

关键词： CGS BiCGStab mL(n)BiCGStab multiple starting Lanczos Krylov subspace iterative methods linear systems

mathematical model for Application of Simulated Tikuanyin Tea Residues on Wool Dyeing Process

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Journal of China Textile University(English Edition) 1999年第2期16卷 21-25页

作者： chan P. m., Yuen C. W. m., yeung K. W.Institute of Textiles and Clothing, The Hong Kang Polytechnic University, Hong Kong The Hong Kong Polytechnic Univ Hongkong Hong Kong

The central composition experimental design of multiva-riate Response Surface method was used to formulate mathematical models aiming to predict (1) the optimum dyeing conditions of simulated waste Tikuanyin tea for wool fabric and (2) the optimum extraction conditions of a natural mordant originated from common waste eggshell. The pre - mordanting eggshell was applied to wool fabric before dyeing with simulated waste Tikuanyin tea under the optimum dyeing conditions. After mordanting the wool fabric with extracted natural eggshell solution, the prominent effect of increment in dye uptake and improvement of the properties of light fastness, washing fastness and rubbing fastness were evaluated.

关键词： mathematical model natural dye tea wool dyeing mordant yellowing

CAE-integrated Fabrication of Functionally Graded Components

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厦门大学学报（自然科学版） 2002年第S1期41卷 214-215页

作者： Y C yeung K m Yu Department of Industrial & Systems Engineering the Hong Kong Polytechnic UniversityDepartment of Industrial & Systems Engineering the Hong Kong Polytechnic University Hong Kong ChinaHong Kong China

A typical contemporary computerized product develop me nt workflow is outlined in Fig.1. Product geometry information is first prep ared with computer-aided design (CAD) software. The CAD format can then be com municated to other downstream-computerized applications like, computer-aided e ngineering analysis (CAE), computer-aided manufacturing (CAm) and/or rapid prot otyping. Since design may need to be modified to incorporate new requirements, a loop back path is also depicted in Fig.1. The design engineers will check ac cording to their experience, result of physical test and CAE simulation to decid e whether redesign is needed or not. If the design passes all tests, its pr ototype or product can be produced. Otherwise, the current practice is to chang e its geometry and/or select a more appropriate material. The iteration repeat s until the latest version satisfies the engineering specification and customer requirements. Note that the material is homogeneous in the part to be designed. With the advent of functionally graded material (FGm) research, a new workflow will become possible. Components incorporating FGm’s can be designed to achieve levels of performance superior to that of homogeneous materials by combining the desirable properties of each constituent phase. Theoretically, the material composition can be tailo red within a component to achieve local control of properties; for example, form ability, corrosion resistance, hardness, toughness, and so on. By such local co ntrol, monolithic components can be created that integrate the function of multi ple discrete components, saving part count, space, weight, and enabling concepts that would otherwise be impractical. Controlling the spatial distribution of p roperties via composition will allow for control of the state of the entire comp onent (the state of residual stress in a component). There are various methods p roposed to produce FGm components. In particular, solid freeform fabrication ( SFF) methods

关键词： CAE-integrated Fabrication of Functionally Graded Components FGm

Development of a Fuzzy Fire Risk Evaluation model for Building Construction Sites in Hong Kong

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Journal of Construction Research 2021年第2期3卷 27-42页

作者： John F.Y.yeung Daniel W.m.chan Division of Business College of International EducationSchool of Continuing EducationHong Kong Baptist UniversityHong KongChina Department of Building and Real Estate The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Earlier research works on fire risk evaluation indicated that an objective,reliable,comprehensive,and practical fire risk evaluation model is essential for mitigating fire occurrence in building construction ***,real empirical studies in this research area are quite *** journal paper gives an account of the second stage of a research study aiming at developing a fuzzy fire risk evaluation model for building construction sites in Hong *** empirical research findings showed that the overall fire risk level of building construction sites is 3.6427,which can be interpreted as“moderate risk”.Also,the survey respondents perceived that“Restrictions for On-Site Personnel”is the most vital fire risk factor;with“Storage of Flammable Liquids or Dangerous Goods”being the second;and“Attitude of main Contractor”the *** proposed fuzzy fire risk evaluation model for building construction sites can be used to assess the overall fire risk level for a building construction site,and to identify improvement areas *** the fuzzy fire risk evaluation model was developed domestically in Hong Kong,the research could be reproduced in other nations to develop similar models for international *** an extension would provide a deeper understanding of the fire risk management on building construction sites.

关键词： Fire risk evaluation Reliability interval method Fuzzy set Fuzzy synthetic evaluation Building construction sites Hong Kong