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中国三峡工程的移民前景及问题

人类环境杂志 1995年第2期24卷 98-102页

作者： chau kwai-cheong 侯向阳香港中文大学

中国的三峡工程将给长江流域带来防洪抗洪、水力发电、航运之便。另一方面,到2008年,这项巨型工程将使19个县、市的全部或局部,包括 238km^2的农田、50km^2的桔园被水淹没,需要移民人数达1 131 800。历史上,三峡地区闭塞落后。恶劣的自... 详细信息

中国的三峡工程将给长江流域带来防洪抗洪、水力发电、航运之便。另一方面,到2008年,这项巨型工程将使19个县、市的全部或局部,包括 238km^2的农田、50km^2的桔园被水淹没,需要移民人数达1 131 800。历史上,三峡地区闭塞落后。恶劣的自然环境、过多的人口以及微薄的投入制约了该地区的经济发展。为了避免出现中国以前的水利工程所发生的接收移民问题,计划将迁居人口安置在被淹没村庄内和本县内的海拔 160～800m的高地。这是一项艰巨的任务,因为中国不仅是简单地移民,同时还要发展地区经济。移民的试验工作早在1985年就开始了,试图引导当地人民接受移民计划,支持三峡工程。三峡地区的持续发展对亿万人民的长远利益是至关重要的。必须努力保护经济发展和环境保护之间的平衡,以免使环境继续恶化,并使贫困问题进一步发展。

关键词：中国三峡工程水利工程移民

Using sequential analysis procedures to rank the influencing factors of public work’s quality

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第3期7卷 330-334页

作者： YANG chau-ping Department of Civil Engineering and Engineering Informatics Chung-Hua University Hsin Chu Taiwan 30067 China

In order to improve the efficiency in management of public work projects, screening and controlling influencing factors affecting the quality of a public work project is essential. This study synthesized 9 influential categories including 91 factors related to quality management of public works in Taiwan using a sequential analysis procedure. According to the Borda-values of influencing factors obtained from a first stage questionnaire, the number of primary factors selected by the re-sponsible entities and the design-supervisory entities were 44 and 45 respectively. A Fuzzy Analytic Hierarchy Process (FAHP) was used to prioritize and rank these factors. The top five factors ranked by the responsible entities were (1) introduction of the earned value analysis, (2) working efficiency, (3) environmental laws and regulations, (4) price-index fluctuation, and (5) on-site safety management. The top five factors ranked by the design-supervisory entities were (1) man power, (2) laws and regulations, (3) price-index fluctuation, (4) traffic conditions, and (5) faulty design.

关键词： FAHP Public works Quality management Influencing factors

Resection of hepatitis B virus-related hepatocellular carcinoma:Evolving strategies and emerging therapies to improve outcome

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World Journal of Gastroenterology 2014年第35期20卷 12473-12484页

作者： Gar-Yang chau Division of General Surgery Department of SurgeryTaipei Veterans General Hospitaland School of MedicineNational Yang-Ming University

The incidence of hepatocellular carcinoma(HCC) is increasing worldwide,largely due to hepatitis B virus(HBV),hepatitis C virus and liver *** HBV infection is estimated to cause 55%-60% of the cases of HCC worldwide and over 70% in Asian *** resection is currently the mainstay of treatment due to the low surgical mortality,a wider treatment indication,and simplicity of post-treatment *** is an ever-increasing demand on surgeons to perform curative liver resection in HCC,with the hope of avoiding tumor *** B-related-HCC has distinct clinicopathological features,which should be considered when treating the *** author presents a review of the recently evolving strategies and emerging therapies to improve HCC postresectional outcomes and focus on perioperative measures to improve patient outcome,with particular reference to the current status of adjuvant therapies in HCC patients after liver resection.

关键词： Hepatocellular carcinoma Hepatitis B virus Hepatic resection Outcome Adjuvant therapy

Liouvillian Solutions of Algebraic Ordinary Differential Equations of Order One of Genus Zero

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Journal of Systems Science & Complexity 2023年第2期36卷 884-893页

作者： NGUYEN Tri Dat NGO Lam Xuan chau Faculty of Basic Science Ho Chi Minh City University of TransportHo Chi Minh CityVietnam Department of Mathematics and Statistics Quy Nhon UniversityQuy Nhon CityVietnam

This paper considers the class of autonomous algebraic ordinary differential equations(AODEs)of order one,and studies their Liouvillian general *** particular,let F(y,w)=0 be a rational algebraic curve over *** authors give necessary and sufficient conditions for the autonomous first-order AODE F(y,y′)=0 to have a Liouvillian solution over ***,the authors show that a Liouvillian solutionαof this equation is either an algebraic function over C(x)or an algebraic function over C(exp(ax)).As a byproduct,these results lead to an algorithm for determining a Liouvillian general solution of an autonomous AODE of order one of genus *** parametrizations of rational algebraic curves play an important role on this method.

关键词： Algebraic ordinary differential equation autonomous differential equation Liouvillian solution rational algebraic curve rational parametrizations

Organic dye removal and recycling performances of graphene oxide-coated biopolymer sponge

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Progress in Natural Science:Materials International 2022年第5期32卷 634-642页

作者： Thi Sinh Vo Tran Thi Bich chau Vo School of Mechanical Engineering Sungkyunkwan University Department of Industrial Management Can Tho University

In this study, a biopolymer sponge(PS) with a crosslinked mixture of gelatin-chitosan-poly(vinyl alcohol) was dipped into graphene oxide(GO) solution to form a composite sponge(CS, GO-coated PS) by a combination of simple dip-coating and freeze-drying procedures, as a sponge-like adsorbent in organic dye removal *** morphological, chemical, crystalline, mechanical and thermal characterizations of the as-obtained sponges were further investigated for the possible changes in the structure of sponge-like adsorbent after coating the GO sheets on the 3D porous structure of PS. The results showed that the CS had possessed effectively organic dye removal performances comparing to the PS. In the adsorption, the Langmuir and pseudo-second-order models corresponding to a monolayer approach and a chemical adsorption were appropriated. The maximum adsorption capacity of Rhodamine B and Congo red reached 126.8 and 135.0 mg·g-1; and 145.6 and 148.6 mg·g-1corresponding onto the PS and CS. It indicates that the maximum adsorption capacity on the CS enhanced significantly comparing to those on the PS owing to the functional GO sheets coated in the 3D porous structure of PS, which leads to supplying further functional adsorption sides on the whole 3D porous structure of CS. Notably, the sponges-like adsorbents could be regenerated and used again without a remarkable decrease of dye removal ability occurred in 9 adsorbing–desorbing cycles. Therefore, the CS prepared in this study can become a potential adsorbent for actual applications because of non-toxic materials, proper structural features, low-cost material and operation, and reliable recyclability.

关键词： Graphene oxide Biopolymer sponge Organic dye Adsorption Dye removal Recyclability

New technique:Detection and location of partial discharge in cast-resin dry-type transformers using a waveguide and a new acoustic emission sensor pair design

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第4期12卷 345-350页

作者： Ching-chau SU Jiann-fuh CHEN Department of Electrical Engineering National Cheng Kung University

The acoustic emission (AE) method could be used to detect and locate partial discharges (PD) in cast-resin dry-type ***,due to the high sound attenuation in the filled epoxy,the signal is prone to interference from external noises and thus,in practice,there is little possibility of detecting *** this study,two techniques were developed to alleviate the shortcomings of the AE ***,a waveguide is installed on the high-voltage (HV) windings,so that the acoustic signals of PD will propagate to the AE sensors that are installed on both terminals of the *** location of the winding that has PD can then be detected from the difference in arrival time of the acoustic *** results indicate that the waveguide technique is able to enhance the safety of a measurement system and offers the advantages of easy installation and higher ***,a specially designed AE sensor pair is used to distinguish whether acoustic signals are generated by PD inside the HV winding or by the corona outside the *** these two techniques of waveguide and AE sensor pair not only greatly improves sensitivity but also increases the reliability of the measurement *** test results show that the new techniques can be used to locate precisely the PD in HV windings.

关键词： Partial discharge Acoustic emission Cast-resin dry-type transformer Waveguide Acoustic emission sensors

Palladium-Catalyzed Desulfinative Cross-Coupling of Polyhalogenated Aryl Triflates with Aryl Sulfinate Salts:Inversion of Traditional Chemoselectivity

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Chinese Journal of Chemistry 2023年第8期41卷 909-914页

作者： Miao Wang On Ying Yuen chau Ming So State Key Laboratory of Chemical Biology and Drug Discovery and Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityKowloonHong KongChina Henan Key Laboratory of Function-Oriented Porous Materials College of Chemistry and Chemical EngineeringLuoyang Normal UniversityLuoyangHenan471934 China The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenGuangdong518057 China

Comprehensive Summary This paper presents the first general examples of palladium-catalyzed desulfinative cross-coupling reaction of polyhalogenated aryl triflates with aryl sulfinate salts showing an inversion of the conventional reactivity order of C-Br>C-Cl>*** catalyst system,comprising of Pd(OAc)_(2)and tBuPhSelectPhos,exhibited excellent catalytic reactivity and chemoselectivity toward this *** reaction had a wide range of substrate scopes and provided a simple and efficient method for the construction of functionalized biaryl ***,the C-H···Pd interaction from the methine hydrogen of the C2-cyclohexyl group of the indolyl phosphine ligand with the Pd center may contribute a key factor in reactivity and *** with density functional theory(DFT)calculations,the results revealed that the oxidative addition step in this reaction was a controlling-chemoselectivity step.

关键词： Palladium Phosphane ligands IChemoselectivity Desulfurization Polyhalogenated aryl triflates

Xianfeng？ Houfeng？ Youfeng？-An analysis of selected contemporary Chinese architects, Yung Ho Chang, Liu Jiakun, and Wang Shu （1990s-2000s）

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Frontiers of Architectural Research 2015年第2期4卷 146-158页

作者： Hing-wah chau Faculty of Architecture Building and Planning The University of Melbourne Victoria 3000 Australia

The three contemporary Chinese architects, namely Yung Ho Chang, Liu Jiakun, and Wang Shu, have often been labeled as the ＇avant-garde＇ or xianfeng architects in China. In response to the xionfeng architect labet, Wang claims that he is a houfeng （rear-guard） architect because of his obsession with traditions. This paper aims to discuss the appropriateness of labeling these architects as ＇avant-garde,＇ xianfeng, or houfeng. Through the theoreticat anatysis of western discourse, notable attributes of the western architectural avant-garde are identified, and a tentative framework is developed to test its validity and usefulness in a non-western context. The term youleng is arguably a better phrase to describe these three Chinese architects considering the heterogeneous trajectory of modernity in China.

关键词： ContemporaryChinese architecture Architectural avant-garde Experimentation Social response Serf-consciousness Design strategies

Within-Cluster Variability Exponent for Identifying Coherent Structures in Dynamical Systems

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Communications in Computational Physics 2023年第3期33卷 824-848页

作者： Wai Ming chau Shingyu Leung Department of Mathematics The Hong Kong University of Science and TechnologyClear Water BayHong Kong

We propose a clustering-based approach for identifying coherent flow structuresin continuous dynamical systems. We first treat a particle trajectory over a finitetime interval as a high-dimensional data point and then cluster these data from differentinitial locations into groups. The method then uses the normalized standarddeviation or mean absolute deviation to quantify the deformation. Unlike the usualfinite-time Lyapunov exponent (FTLE), the proposed algorithm considers the completetraveling history of the particles. We also suggest two extensions of the method. To improvethe computational efficiency, we develop an adaptive approach that constructsdifferent subsamples of the whole particle trajectory based on a finite time interval. Tostart the computation in parallel to the flow trajectory data collection, we also developan on-the-fly approach to improve the solution as we continue to provide more measurementsfor the algorithm. The method can efficiently compute the WCVE over adifferent time interval by modifying the available data points.

关键词： Dynamical system visualization finite time Lyapunov exponent numerical methods for differential equations k-means clustering