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EXPLORATION OF CRITICAL EXTERNAL PARTNERS OF ARCHITECTURE/ENGINEERING/CONSTRUCTION (AEC) FIRMS FOR DELIVERING GREEN BUILDING PROJECTS IN SINGAPORE

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Journal of Green Building 2012年第3期7卷 193-209页

作者： yuan yuan Li Po-Han Chen David Ah Seng chew Chee Chong Teo Rong Gui Ding School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore639798 Department of Civil Engineering National Taiwan UniversityTaipei10617 TaiwanChina Management School Shandong UniversityJinanShandong Province250100P.R.China

Green Building involves many parties and has attracted attention recently. In this paper, the main external actors for Green Building were explored based on literature review. Then, a structured questionnaire was developed to facilitate systematic data collection. Finally, a stepwise multiple regression analysis was applied and “clients,” “government,” “qualified/certified materials and products suppliers,” and “good green consultants” were found to be significant external partners of Architecture/Engineering/Construction (AEC) firms for successful delivery of Green Mark certified projects. The research findings will help AEC firms understand how to achieve competitive advantages in the Green Building market in Singapore by using external resources.

关键词： critical external relationships critical partners Architecture/Engineering/Construction(AEC)firms Green Building Green Mark Singapore multiple regressions

Zeolite-based Fenton-like catalysis for pollutant removal and reclamation from wastewater

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Chinese Chemical Letters 2022年第11期33卷 4719-4731页

作者： Zichen Shangguan Xingzhong yuan Longbo Jiang Yanlan Zhao Lei Qin Xuerong Zhou Yan Wu Jia Wei chew Hou Wang College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Key Laboratory of Environment Biology and Pollution Control Hunan UniversityMinistry of EducationChangsha 410082China College of Resources and Environment Hunan Agricultural UniversityChangsha 410128China School of Chemical and Biomedical Engineering Nanyang Technological UniversitySingapore 637459Singapore

Wastewater treatment and reclamation from wastewater are essential for the sustainable use of water ***-based heterogeneous catalysis shows great potential in circumventing the current limitations on pollutant removal and transformation to useful chemicals,inspiring advancements towards practical water *** paper summarizes the methods for synthesizing zeolite-based catalyst,and the corresponding advantages and *** comparison with traditional Fenton-like reaction,the superiority of zeolite-based catalysis lies in less sludge,wide pH range and easy ***,applications of zeolite-based Fenton-like catalysis(ZFCs)in pollutant removal and reclamation of wastewater were *** was placed on the methodological strategies in improving ZFCs,including the combination of external driving force(e.g.,photocatalysis or electrochemistry),as well as the introduction of various transition metals into zeolite-based *** challenges and future perspectives for ZFCs were proposed.

关键词： Zeolite-based catalysis Methodology External field Degradation Useful chemical regeneration

Analysis of top Chinese contractors' developmental tracks and evaluation of their strategic selection of international construction markets

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Engineering Sciences 2008年第4期6卷 80-86,96页

作者： Wu Weiwei David A.S. chew Li Qiming Zhong yuan Department of Construction and Real Estate Southeast University Nanjing 210096 China School of Civil and Environmental Engineering Nanyang Technological University Singapore China Resources Land Limited Beijing 100089 China

The past decade has witnessed a rapid development of the international construction market. This research aims to investigate top Chinese contractors' developmental tracks and evaluate their strategic selection of international construction markets over the period from 2001 to 2006,based on the modified Boston Consulting Group Matrix (BCG). Results from 2001 to 2005 indicate that Asia and Africa,which were "question marks" markets for top Chinese contractors (abbreviated as TCCs),have the most potential to become "stars" markets; other question marks markets such as the Middle East and Europe are found not to be of potential; "dogs" markets such as the U.S.,Canada and Latin America should be relinquished progressively unless there is renewed growth opportunity over the next two years. Compared to developmental tracks of top contractors from some advanced countries,TCCs' investment and development strategy in Africa seems to be sustainable and intensive; TCCs' exit strategy for the Middle East appears determined and swift,while their strategy in Asia seems to be lacking in persistence. Furthermore,the data of 2006 indicates that TCCs improve their performance in Asia and Africa,and Africa has become a "stars" market for *** research sheds important lights and insights into the prevailing process of internationalization of TCCs and provides a strategic direction for their selection of international construction market. What is more,this research is also valuable to other Chinese contractors who are seeking the opportunity to enter the international construction markets.

关键词： international development construction industry developmental tracks top Chinese contractors China

A case study on sample average approximation method for stochastic supply chain network design problem

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Frontiers of Engineering Management 2017年第3期4卷 338-347页

作者： yuan WANG Ruyan SHOU Loo Hay LEE Ek Peng chew Department of Industrial Systems Engineering & Management National University of Singapore

This study aims to solve a typical long-term strategic decision problem on supply chain network design with consideration to uncertain demands. Existing methods for these problems are either deterministic or limited in scale. We analyze the impact of uncertainty on demand based on actual large data from industrial *** equivalent model with nonanticipativity constraints, branch-and-fix coordination, sample average approximation(SAA) with Bayesian bootstrap, and Latin hypercube sampling were adopted to analyze stochastic demands. A computational study of supply chain network with front-ends in Europe and back-ends in Asia is presented to highlight the importance of stochastic factors in these problems and the efficiency of our proposed solution approach.

关键词： supply chain network stochastic demand sampling average approximation Bayesian bootstrap Latin hypercube sampling

杂原子掺杂的羧酸功能化炭材料的制备及其吸附U(VI)性能

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新型炭材料 2021年第6期36卷 1138-1148页

作者：刘妍刘晓鹏戴荧王云袁定重刘晋彪 chew Jia-wei 东华理工大学核资源与环境国家重点实验室南昌330013 江西理工大学化学学院赣州341000 新加坡南洋理工大学化学和生物医学工程学院新加坡637459 新加坡南洋理工大学南洋环境与水资源研究院新加坡膜技术中心新加坡639798

通过煅烧前驱体聚磷腈,制备了掺杂N,P和O的羧基官能化炭材料(CS―COOH)。利用TEM,SEM,XPS和FTIR技术确定了CS―COOH结构。研究了CS―COOH从水溶液中吸附U(VI)情况,结果表明,吸附动力学符合准二级动力学模型,通过Langmuir模型计算得到在2... 详细信息

通过煅烧前驱体聚磷腈,制备了掺杂N,P和O的羧基官能化炭材料(CS―COOH)。利用TEM,SEM,XPS和FTIR技术确定了CS―COOH结构。研究了CS―COOH从水溶液中吸附U(VI)情况,结果表明,吸附动力学符合准二级动力学模型,通过Langmuir模型计算得到在298 K下材料的最大吸附量为402.9 mg/g。CS―COOH在5次吸附-解吸循环后表现出良好的吸附结果。根据XPS分析,材料较好的U(VI)吸附能力主要归因于羧基及杂原子与铀酰离子之间的强共价键结合。

关键词：聚磷腈羧基铀吸附杂原子

Experience with Open and Laparoscopic Surgery for Primary Gastric Stromal Tumors in a Single Institute

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Surgical Science 2017年第6期8卷 229-239页

作者： Yi-Hsuan Hu Kuo-Hung Huang yuan-Tzu Lan Jen-Hao Chen Su-Shun Lo Anna Fen-Yau Li Shih-Hwa Chiou chew-Wun Wu Yi-Ming Shyr Wen-Liang Fang Division of General Surgery Department of Surgery Taipei Veterans General Hospital Taiwan Division of General Surgery Department of Surgery Cardinal Tien Hospital Taiwan Division of Colon & Rectal Surgery Department of Surgery Taipei Veterans General Hospital Taiwan Department of Pathology Taipei Veterans General Hospital Taiwan National Yang-Ming University Taiwan Institute of Clinical Medicine School of Medicine National Yang-Ming University Taiwan Cheng Hsin General Hospital Taiwan National Yang-Ming University Hospital Taiwan Department of Medical Research and Education Taipei Veterans General Hospital Taiwan Institute of Pharmacology National Yang-Ming University Taiwan

Laparoscopic surgery has become increasingly popular in the management of gastric gastrointestinal stromal tumors (GISTs) in recent years. One hundred and forty-five patients underwent curative resections of primary gastric stromal tumors between September 2002 and March 2012 were assigned to either an open surgery group (n = 99) or a laparoscopic surgery group (n = 46). In the open surgery group, there was a significantly higher number of samples with a mitotic index ≥ 10 (16.1% vs. 0%), more tumors located in the gastric cardia (13.1% vs. 6.5%), greater operative blood loss (80 mL vs. 50 mL) and a longer postoperative hospital stay (10 days vs. 6 days) than in the laparoscopic group. The surgical morbidity and mortality were 6.1% and 0% in the open group, whereas no complication or mortality in the laparoscopic group. Ten patients in the open group had tumor recurrences and no recurrence in the laparoscopic group. Multivariate analysis showed that tumor size and mitotic index were two independent risk factors associated with tumor recurrence. The 3-year disease-free survival rates and 5-year overall survival rates were similar between the two groups. The laparoscopic approach is a safe alternative procedure for gastric GISTs.

关键词： GIST Open Laparoscopic Tumor Size Mitotic Index

Sr and Nd isotopic compositions of apatite reference materials used in U–Th–Pb geochronology

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Sr and Nd isotopic compositions of apatite reference materia...

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Yue-Heng Yang Fu-yuan Wu Jin-Hui Yang David M.chew Lie-Wen Xie Zhu-Yin Chu Yan-Bin Zhang Chao Huang State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Department of Geology School of Natural Sciences Trinity College Dublin

Apatite is an important common U- and Th-bearing accessory mineral in igneous, metamorphic and clastic sedimentary rocks. The advent of in situ U–Th–Pb apatite geochronology by the SIMS and LA-(MC)-ICP-MS methods has demonstrated the importance of having uniform and homogeneous reference materials. Recently, it has been shown that Sr and Nd isotopic data combined with U–Pb age and trace element concentration data can provide important constraints on apatite paragenesis because this phase usually exhibits high Sr and REE concentrations but has low Rb/Sr ratios which result in negligible corrections for the ingrowth of radiogenic Sr. However, as apatite can potentially have complex internal structures resulting from multiple thermal events, such as inherited cores and metamorphic overgrowths, requires that the Sr and Nd isotopic data should be measured with high spatial resolution. However isobaric interferences hamper the precise determination of Sr or Nd isotopic compositions in LA-MC-ICP-MS analysis. In this work we undertook in situ measurements of Sr and Nd isotopic compositions of eleven apatite reference materials(AP1, AP2, Durango, MAD, Otter Lake, NW-1, Slyudyanka, UWA-1,Mud Tank, Mc Clure Mountain and SDG) commonly used in U–Th–Pb geochronology. Our obtained Sr and Sm–Nd isotopic compositions for these apatite samples are consistent with those values obtained by solutionbased methods(isotope dilution and ion chromatography) using MC-ICP-MS or TIMS, which demonstrates the reliability and robustness of our analytical protocol.

关键词： Apatite Sr isotopes Sm–Nd isotopes LA-MC-ICP-MS U–Th–Pb geochronology

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积分——水平集求全局最优的遗传算法实现

数学的实践与认识 2006年第3期36卷 212-216页

作者：王延源山东临沂师范学院数学系山东临沂276005

chew Soo Hong,Zheng Q uan提出了一个积分——水平集求全局最优的概念性算法及M on te-C ar-lo随机投点的实现途径,并在很多实际问题中得到了很好的应用,但这一实现算法的收敛性是个未解决的问题.利用近年来广泛应用的遗传算法,给出了... 详细信息

chew Soo Hong,Zheng Q uan提出了一个积分——水平集求全局最优的概念性算法及M on te-C ar-lo随机投点的实现途径,并在很多实际问题中得到了很好的应用,但这一实现算法的收敛性是个未解决的问题.利用近年来广泛应用的遗传算法,给出了这一算法的另一种实现途径,并从理论和数值两个方面验证了算法的可行性.

关键词：全局收敛性最优水平集遗传算法

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3个产区沉香燃烧烟气特征化学成分分析

林业科学 2024年第10期60卷 122-132页

作者：晏婷婷李改云陈媛中国林业科学研究院木材工业研究所北京100091

【目的】分析沉香主要成分在燃烧过程中的挥发或裂解方式,比较国产、惠安系和星洲系3个产区沉香燃烧释放的挥发性和半挥发性成分组成及差异,确认对沉香燃烧香气有贡献的气味活性化合物及其来源,解释沉香燃烧气味形成原因,为沉香产地识... 详细信息

【目的】分析沉香主要成分在燃烧过程中的挥发或裂解方式,比较国产、惠安系和星洲系3个产区沉香燃烧释放的挥发性和半挥发性成分组成及差异,确认对沉香燃烧香气有贡献的气味活性化合物及其来源,解释沉香燃烧气味形成原因,为沉香产地识别和香气品质评价提供科学依据。【方法】采用水蒸馏和乙醇提取沉淀方法分离沉香树脂部分中倍半萜类和2-(2-苯乙基)色酮类(PECs)特征成分,应用热重(TG)分析倍半萜类、PECs化合物和木材部分的热质量损失模式,使用静态顶空气相色谱质谱联用(HS-GC-MS)分析不同产区沉香燃烧烟气中的挥发性成分并确认气味活性化合物,利用主成分分析(PCA)分析3个产区沉香燃烧释放的挥发性成分差异,收集燃烧沉香产生的烟尘,运用液相质谱(LC-MS/MS)联用分析其中PECs成分组成,通过HS-GC-MS分析加热后的PECs标准品,探究沉香中PECs化合物裂解机制及其对燃烧气味的影响。【结果】1)沉香中的倍半萜类化合物在200℃以内完全挥发,PECs化合物质量在150~350℃缓慢降低,木材在250℃以上迅速燃烧。2)沉香燃烧释放的挥发性成分主要为芳香族和倍半萜类化合物,其中芳香族化合物种类和含量明显增加,为沉香燃烧气体提供辛、甜、杏仁、花香等丰富的气味;国产沉香中2-甲氧基-4-乙烯基苯酚、3,4-二甲氧基苯酚、乙酰丁香酚等7种化合物释放量与样品乙醇提取物含量负相关,这些化合物主要为沉香燃烧烟气提供烟熏、粉尘和木材气味。3)倍半萜类关键香气化合物桉油烯醇、cis-桉叶-6-烯-11-醇、愈创木醇的相对含量在国产沉香中最高,惠安系沉香中次之,星洲系沉香中最低。4)沉香燃烧烟尘中含有多种Flidersia型2-(2-苯乙基)色酮类(FTPECs)化合物,但未检测到四氢2-(2-苯乙基)色酮类(THPECs)化合物。沉香四醇裂解释放苄基丙酮和苯甲醛,2-(2-苯乙基)色酮高温裂解不仅生成苯甲醛、苯乙醇等6种芳香族化合物,还能挥发进入空气。【结论】沉香的主要成分倍半萜类、PECs化合物和木材燃烧过程中热质量损失模式不同,倍半萜类化合物直接挥发进入空气,PECs化合物和木材裂解生成多种芳香族化合物,这些化合物具有多种气味,对沉香燃烧香气有重要影响。不同产区沉香燃烧后释放的化学成分存在一定差异,星洲系与惠安系和国产沉香差异较大。高温下不同种类PECs裂解生成芳香族化合物种类和含量不同,FTPECs可部分挥发进入空气中。

关键词：野生沉香产区燃烧烟气倍半萜类 2-(2苯乙基)色酮类