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Industrial water treatment and industrial marine outfalls： Achieving the right balance

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Frontiers of Chemical Science and Engineering 2016年第4期10卷 472-479页

作者： Adrian w. k. Law Chunyan Tang Environmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University Singapore 637141 Singapore School of Civil and Environmental Engineering Nanyang Technological University Singapore 639798 Singapore

Industrial water treatment and industrial marine outfalls both function together to reduce the pollutant concentrations in the effluent and mitigate the potential impact on the environment. The former uses environ- mental treatment technology with energy and material cost considerations, while the latter utilizes the natural assimilation potential of the coastal water environment achievable at the outfall location. Because of their synergistic nature, marine outfalls are now commonly used for the disposal of partially treated domestic and industrial effluents in many coastal cities around the world, with many successful examples of low and acceptable risks to the environment. The objective of this paper is to review their balance from both environmental and economic considerations. we also discuss the end-of-the-pipe and mixing zone approaches for industrial effluents, and give some recommendations particularly for developing coun- tries. Finally, we emphasize that a compulsory and vigorous monitoring program is essential regardless of how the balance is achieved.

关键词： industrial effluent treatment industrial marineoutfalls economic and environmental considerations

Numerical analysis of the s1020 airfoils in tandem under different flapping configurations

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Acta Mechanica Sinica 2010年第2期26卷 191-207页

作者： k.B.Lim w.B.Tay Department of Mechanical Engineering National University of Singapore21 Lower Kent Ridge RoadSingapore 119077Singapore

The objective of this project is to improve the performance of the efficiency, thrust and lift of flapping wings in tandem arrangement. This research investigates the effect of the arrangement of the airfoils in tandem on the performance of the airfoils by varying the phase difference and distance between the airfoils. Three flapping configurations from an earlier phase of a research which gives high efficiency, thrust and lift are used in the tandem simulation. It is found all the different flapping configurations show improvement in the efficiency, thrust or lift when the distance between the two airfoils and the phase angle between the heaving positions of the two airfoils are optimal. The average thrust coefficient of the tandem arrangement managed to attain more than twice that of the single one （4.84 vs. 2.05）. On the other hand, the average lift coefficient of the tandem arrangement also increased to 4.59, as compared to the original single airfoil value of 3.04. All these results obtained will aid in the design of a better ornithopter with tandem wing arrangement.

关键词： Tandem Flapping· Airfoils Ornithopter·Immersed boundary

A novel respirometer for biological toxicity tests

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Journal of Environmental Sciences 1997年第3期9卷 92-98页

作者： Zhang Minquan Chen Huanqin wong kwok-Yin Chemical Engineering Research Institute South China University of TechnologyGuangzhou 510641 China Department of Applied Biobgy and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong

A respirometer has been developed for microbial toxicity tests. The respirometer is based on luminescence quenching by molecular oxygen. The oxygen sensing film consists of luminescent ruthenium complex adsorbed on amorphous fumed silica and immobilized inside silicone rubber. The luminescence intensity depends on the oxygen concentration of sample in contact with sensing film. The inhibition effect of heavy metals on the respiration rate of microorganisms can be evaluated by monitoring the luminescence intensity of the sensing film. The toxicity of Cu 2+ , Zn 2+ , Ni 2+ , Cr 3+ , Pb 2+ and Hg 2+ on activated sludge was tested using the respirometer. The results indicated that the proposed method was sensitive to the heavy metals tested in this experiment. It was feasible to use the respirometer for microbial toxicity tests.

关键词： luminescence quenching respirometer toxicity test heavy metal.

Statistical extremes and peak factors in wind-induced vibration of tall buildings

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第1期13卷 18-32页

作者： Ming-feng HUANG Chun-man CHAN wen-juan LOU kenny Chung-Siu kwok Institute of Structural Engineering Zhejiang University Hangzhou 310058 China Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Hong Kong School of Engineering University of Western Sydney NSW Australia

In the structural design of tall buildings, peak factors have been widely used to predict mean extreme responses of tall buildings under wind excitations. Vanmarcke＇s peak factor is directly related to an explicit measure of structural reliability against a Gaussian response process. we review the use of this factor for time-variant reliability design by comparing it to the conven- tional Davenport＇s peak factor. Based on the asymptotic theory of statistical extremes, a new closed-form peak factor, the so-called Gamma peak factor, can be obtained for a non-Gaussian resultant response characterized by a Rayleigh distribution process. Using the Gamma peak factor, a combined peak factor method was developed for predicting the expected maximum resultant responses of a building undergoing lateral-torsional vibration. The effects of the standard deviation ratio of two sway components and the inter-component correlation on the evaluation of peak resultant response were also investigated. Utilizing wind tunnel data derived from synchronous multi-pressure measurements, we carried out a wind-induced time history response analysis of the Common- wealth Advisory Aeronautical Research Council （CAARC） standard tall building to validate the applicability of the Gamma peak factor to the prediction of the peak resultant acceleration. Results from the building example indicated that the use of the Gamma peak factor enables accurate predictions to be made of the mean extreme resultant acceleration responses for dynamic service- ability performance design of modem tall buildings.

关键词： Level-crossing rate (LCR) wind-induced vibration Mean extreme response Combined resultant process Peakfactor method

Value distribution theory and the research of Yang Lo

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Science China Mathematics 2010年第3期53卷 513-522页

作者： HAYMAN w. k. Department of Mathematics Imperial College London South Kensington Campus

Value distribution theory is concerned with the position and frequency of solutions of the equation f(z) = a. Here f may be entire, i.e. an everywhere convergent power series or meromorphic, i.e. the ratio of two such series, or a function in some other domains, such as an angle or a disk. Yang Lo’s significant contributions to this area will be highlighted. Some of his important contributions to normal families will also be described.

关键词： meromorphic function value distribution deficient value angular distribution

Fat cell-secreted adiponectin mediates physical exercise-induced hippocampal neurogenesis: an alternative anti-depressive treatment?

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Neural Regeneration Research 2015年第1期10卷 7-9页

作者： Suk Yu Yau Ang Li Aimin Xu kwok-fai So State key Laboratory of Brain and Cognitive Sciences Li Ka Shing Faculty of MedicineThe University of Hong Kong Division of Medical Sciences University of Victoria BCCanada Department of Anatomy The University of Hong Kong Department of Medicine The University of Hong Kong Department of Pharmacology and Pharmacy The University of Hong Kong Research Centre of Heart BrainHormone and Healthy AgeingThe University of Hong Kong State key Laboratory of Pharmaceutical Biotechnology Li Ka Shing Faculty of MedicineThe University of Hong Kong Department of Ophthalmology The University of Hong Kong Guangdong-Hong kong-Macao Institute of CNS Regeneration Jinan University Guangdong key Laboratory of Brain Function and Diseases Jinan University

Psychological depression is drawing accumulating attention nowadays, due to the skyrocketing incidence worldwide and the enormous burdens it incurs. Physical exercise has been long recog- nized for its therapeutic effects on depressive disorders, although knowledge of the underlying mechanisms remains limited. Suppressed hippocampal neurogenesis in adult brains has been regarded, at least partly, contributive to depression, whereas physical exercise that restores neuro- genesis accordingly exerts the anti-depressive action. Several recent publications have suggested the potential role of adiponectin, a protein hormone secreted by peripheral mature adipocytes, in mediating physical exercise-triggered enhancement of hippocampal neurogenesis and alleviation of depression. Here, we briefly review these novel findings and discuss the possibility of counter- acting depression by modulating adiponectin signaling in the hippocampus with interventions including physical exercise and administration of pharmacological agents.

关键词： hippocampus adult neurogenesis physical exercise voluntary wheel running depression neural progenitor cell adipocyte adiponectin adiponectin receptor AMP-activated protein kinase

Monitoring interannual dynamics of desertification in Minqin County,China,using dense Landsat time series

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International Journal of Digital Earth 2020年第8期13卷 886-898页

作者： Xiaolin Zhu kwok Huen Leung wing Sze Li Lek kin Cheung The Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China The Hong kong Polytechnic University Shenzhen Research Institute ShenzhenPeople’s Republic of China

Minqin County in northwestern China is highly affected by *** have been initiated in recent decades to combat desertification in *** assess the effectiveness of these campaigns,this study used a dense Landsat time series from 1987 to 2017 to investigate the interannual dynamics of vegetation coverage and greenness over the past 31 ***,this study applied an advanced technology to reconstruct a high-quality Landsat annual time ***,one image in the vegetation-peak season was selected as the base image in each year,and then problematic pixels were interpolated by the neighborhood similar pixel interpolator using ancillary images in the same ***,the land cover map and the enhanced vegetation index(EVI)were derived from all reconstructed ***,the change of vegetation coverage and EVI values over the 31 years were *** results show that the total vegetation coverage and greenness increased during the 31 *** this change trend to other factors suggests that vegetation in Minqin County is highly affected by agriculture and groundwater supply rather than by *** mitigate desertification in a sustainable way,agriculture should be well managed to avoid overconsumption of natural resources such as underground water.

关键词： Minqin County desertification agriculture Landsat time series vegetation cover

Consumers can learn and can forget-Modeling the dynamic decision procedure when watching TV

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Journal of Management Science and Engineering 2020年第2期5卷 87-104页

作者： Lianlian Song Geoffrey kwok Fai Tso College of Economics and Management Nanjing University of Aeronautics and AstronauticsJiangjun Road 29210000NanjingChina Department of Management Sciences City University of Hong Kong83 Tat Chee AvenueKowloonHong KongChina

Facing the challenge of attracting consumers and winning market share under the pro-liferation of TV stations and channels,the traditional TV stations often make some mar-keting ***,how to evaluate the effectiveness of different strategies and select the best one is a key *** study proposes to resolve this *** develop an innovative structural model to simulate the dynamic choices consumers make under two interactive behaviors:learning and *** behavior refers to updating programme quality assessment by using experience,while forgetting behavior prevents the use of previous *** Bayesian rules are employed to model learning behavior,and they are extended by incorporating an exponential decay function to mea-sure the effect of forgetting *** structural model is tested and validated by using Hong kong television viewing *** empirical results show that when modeling consumer choice decisions,considering learning and forgetting behavior significantly improves the performance of the model in regard to rating prediction and marketing strategy *** cases are simulated to show how the model is used to evaluate marketing *** implications are then discussed to guide the decision-making of traditional TV broadcasters and advertisers.

关键词： Marketing strategy evaluation Dynamic learning Forgetting Bayesian updating theory

Chance-constrained Coordinated Optimization for Urban Electricity and Heat Networks

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CSEE Journal of Power and Energy Systems 2018年第4期4卷 399-407页

作者： Zhinong wei Juan Sun Zhoujun Ma Guoqiang Sun Haixiang Zang Sheng Chen Side Zhang kwok w.Cheung College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China State Grid Jiangsu Electric Power Corporation Nanjing 210098China GE Grid Solutions RedmondWA 98052USA

Urban electricity and heat networks(UEHN)consist of the coupling and interactions between electric power systems and district heating systems,in which the geographical and functional features of integrated energy systems are *** have been expected to provide an effective way to accommodate the intermittent and unpredictable renewable energy sources,in which the application of stochastic optimization approaches to UEHN analysis is highly *** this paper,we propose a chance-constrained coordinated optimization approach for UEHN considering the uncertainties in electricity loads,heat loads,and photovoltaic outputs,as well as the correlations between these uncertain sources.A solution strategy,which combines the Latin Hypercube Sampling Monte Carlo Simulation(LHSMCS)approach and a heuristic algorithm,is specifically designed to deal with the proposed chance-constrained coordinated ***,test results on an UEHN comprised of a modified IEEE 33-bus system and a 32-node district heating system at Barry Island have verified the feasibility and effectiveness of the proposed framework.

关键词： Chance-constrained optimal power flow(CCOPF) correlated uncertainties combined Latin Hypercube Sampling Monte Carlo Simulation(LHSMCS)approach and heuristic algorithm urban electricity and heat networks(UEHN)