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Earth and Planetary Physics 2021年第1期5卷 11-18页

作者： Chi-Fong Wong kim-chiu chow Kwing LChan Jing Xiao Yemeng Wang Space Science Institute/State Key Laboratory of Lunar and Planetary Science Macao University of Science and TechnologyTaipaMacaoChina

Airborne dust is an important constituent in the Martian atmosphere because of its radiative interaction with the atmospheric *** size is one crucial factor in determining this *** reality dust sizes are varied;however,in numerical modeling of dust processes,dust size has usually been described by choice of a particular size distribution function,or by use of fixed values of effective radius(ER)and effective variance(EV).In this work,we present analytical expressions that have been derived to specify ER and EV for Nbin dust schemes,based on a model-calculated dust mixing *** simulations based on this approach thus would consider the effects of variable ER on the atmospheric radiation and their *** have revealed some interesting features of the dust distribution parameters,such as seasonal and spatial variation of ER and EV,which are generally consistent with some previous observational and modeling *** with the usual approach of using a fixed ER,simulation results from the present approach suggest that the variability of ER can have significant effects on the simulated thermal field of the Martian atmosphere.

关键词： Mars dust effective radius effective variance general circulation model

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珠三角地区海陆风环流的季节性特点

珠三角地区海陆风环流的季节性特点

Laparoscopic complete mesocolic excision: West meets East

第32届中国气象学会年会

作者：陆希 kim-chiu chow Teng Yao Jimmy C.H.Fung Alexis K.H.Lau 中山大学环境科学与工程学院大气科学系

本文利用MM5模式模拟的2003-2004一年的数据分析了珠三角地区的海陆风和区域环流的季节性特点并给出了四个季节高分辨率风场图。其中风场的季节平均日变化特征揭示了四个季节海陆风的一般规律。珠三角地区的背景风场受亚洲季风控制,秋... 详细信息

本文利用MM5模式模拟的2003-2004一年的数据分析了珠三角地区的海陆风和区域环流的季节性特点并给出了四个季节高分辨率风场图。其中风场的季节平均日变化特征揭示了四个季节海陆风的一般规律。珠三角地区的背景风场受亚洲季风控制,秋冬季节为东北风,春季为东风,夏季为东南风。同时研究结果还表明,四个季节珠江东岸在下午都有比较强的西风,但是最明显的是秋季和冬季。秋冬两季相对于春夏季节大气处于较稳定状态,使得当地的污染物很难消散。这些气象条件是香港地区秋冬季节污染事件频发的主要原因。由于近几十年珠三角地区发展迅速,出现了几大城市群。

关键词：珠三角海陆风季节变化

来源： cnki会议 cnki会议评论

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World Journal of Gastroenterology 2014年第39期20卷 14301-14307页

作者： Carina F K chow Seon Hahn kim Division of Colorectal Surgery Departmentof SurgeryRoyal Brisbane and Women’s HospitalBrisbaneQueensland 4029 Australia Department of General Surgery Mater Hospital South Brisbane Brisbane Queensland 4101 Australia Department of Surgery University of Queensland Brisbane Queensland 4072 Australia Colorectal Division Department of SurgeryKorea University Anam Hospital Anam-dongSeongbuk-gu Seoul 136-705 South Korea

Complete mesocolic excision is a relatively new concept in western literature. It follows the same concept of total mesorectal excision and units’ routinely performing complete mesocolic excisions have good pathological results as well as good improvements in overall survival, disease free survival and local recurrence. And yet unlike total mesorectal excision, uptake in the West has been relatively slow with many units sceptical of the true benefits gained by taking up a more technically challenging and potentially more morbid procedure when there is a paucity of literature to support these claims. This article reviews complete mesocolic excision for colon cancer, attempting to identify the risks and benefits of the technique and particularly looking at the reasons why its uptake has not been universal. It also discusses the similarities of a complete mesocolic excision to a colon resection with a D3 lymphadenectomy as well as the role of a laparoscopic approach to this technique. Considering a D3 lymphadenectomy has been the standard of care for stage II and III colon cancers in many of our Asian neighbours for over 20 years, combining this data with data on complete mesocolic excision may provide enough evidence to support or refute the need for complete mesocolic excisions. Maybe there might be lessons to be learnt from our colleagues in the east.

关键词： Complete mesocolic excision Colorectal surgery Laparoscopy Colonic neoplasms D3 lymphadenectomy

QUANTIFICATION OF SHEAR DAMAGE EVOLUTION IN ALUMINIUM ALLOY 2024T3

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Acta Mechanica Solida Sinica 2007年第1期20卷 57-64页

作者： Tang Chak-yin Fan Jianping Tsui Chi-pong Lee Tai-chiu Chad Luen-chow Rao Bin Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong China School of Civil Engineering and Mechanics Huazhong University Science and Technology Wuhan 430074 China

Shear damage may occur in the process of metal machining such as blanking and cutting, where localized shear deformation is developed. Experimental findings indicate that microscopic shear damage evolution in aluminium alloy 2024T3 （A1 2024T3） is a multi-stage mechanism, including particle cracking, micro-shear banding, matrix microcracking and coalescence of microcracks. This study is an attempt to use a set of equations to describe the multi-stage shear damage evolution in Al 2024T3. The shear damage variables in terms of multi-couple parameters of a power-law hardening material have been defined. An evolution curve of shearing damage has been calculated from experimental data. The values of the shear damage variable at different stages of damage have also been calculated. By making use of the findings, the relation between the microscopic shear damage evolution and the macroscopic shear response of the material has been discussed.

关键词： shear damage damage evolution equations shear band hardening material microscopic observation

Variability and Risk Analysis of Hong Kong Air Quality Based on Monsoon and El Nino Conditions

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Advances in Atmospheric Sciences 2013年第2期30卷 280-290页

作者： Jong-Suk kim ZHOU Wen Ho Nam CHEUNG Chak Hang chow School of Energy and Environment City University of Hong Kong Hong Kong Guy Carpenter Asia-Pacific Climate Impact Centre City University of Hong Kong Hong Kong

This study presents an exploratory analysis aimed at improving understanding of the variability of Hong Kong air quality associated with different climate conditions. Significantly negative correlations were found when Nifio 3 led particulate matter 〈10 p.m PM10） and NO2 by 2 3 months over the Hong Kong territory, while the other pollutants （e.g., Oa, SO2） showed modest correlations. A significant decreasing trend in visibility was observed during the autumn and winter, which has potential implications for the air-quality degradation and the endangerment of human health in Hong Kong. In an E1 Nifio summer, the visibility was relatively better, while visibility in other seasons was diminished. On the other hand, in La Nifia events, significant changes occurred in visibility in winter and autumn. Air pollution indices were less sensitive to the South China Summer Monsoon （SCSM）, but a relatively high correlation existed between the East Asian Winter Monsoon （EAWM） and air pollutants. Rainfall was lower during most of the strong EAWM years compared to the weak years. This result suggests that the pollutants that accumulate in Hong Kong are not easy to wash out, so concentrations remain at a higher level. Finally, based on the conditional Air Pollution Index （API） risk assessment, site-specific vulnerabilities were analyzed to facilitate the development of the air-quality warning systems in Hong Kong.

关键词： air quality E1 Nifio/La Nifia Monsoon API risk Hong Kong

The Dynamics and Evolution of Poles and Rogue Waves for Nonlinear Schrdinger Equations

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Communications in Theoretical Physics 2017年第9期67卷 290-294页

作者： Tin Lok chiu Tian Yang LIU Hiu Ning CHAN Kwok Wing chow Department of Mechanical Engineering University of Hong Kong Pokfulam Hong Kong China

Rogue waves are unexpectedly large deviations from equilibrium or otherwise calm positions in physical systems, e.g. hydrodynamic waves and optical beam intensities. The profiles and points of maximum displacements of these rogue waves are correlated with the movement of poles of the exact solutions extended to the complex plane through analytic continuation. Such links are shown to be surprisingly precise for the first order rogue wave of the nonlinear Schr¨odinger(NLS) and the derivative NLS equations. A computational study on the second order rogue waves of the NLS equation also displays remarkable agreements.

关键词： poles rogue waves nonlinear Schrodinger equations

Evolutionary prisoner＇s dilemma games with local interaction and best-response dynamics

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Frontiers of Mathematics in China 2015年第4期10卷 839-856页

作者： Yunshyoug chow Institute of Mathematics Academia Sinica Taipei Taiwan 11529 China

This paper studies the long run behavior in evolutionary prisoner＇s dilemma games. All players are assumed to sit around a circle and to interact only with their neighbors. It is known that full-defection is the unique long run equilibrium as the probability of players＇ experimentation （or mutation） tends to zero in the best response dynamics. Here, it is shown that full-cooperation could emerge in the long run if one also cares for his neighbors in the best- response dynamics.

关键词： Prisoner's dilemma game full cooperation best response localinteraction long run equilibrium parallel updating

Collaborative Distributed AC Optimal Power Flow: A Dual Decomposition Based Algorithm

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1414-1423页

作者： Zheyuan Cheng Mo-Yuen chow IEEE Department of Electrical and Computer Engineering North Carolina State University

We propose a dual decomposition based algorithm that solves the AC optimal power flow(ACOPF) problem in the radial distribution systems and microgrids in a collaborative and distributed manner. The proposed algorithm adopts the second-order cone program(SOCP) relaxed branch flow ACOPF model. In the proposed algorithm, bus-level agents collaboratively solve the global ACOPF problem by iteratively sharing partial variables with its 1-hop neighbors as well as carrying out local scalar computations that are derived using augmented Lagrangian and primal-dual subgradient methods. We also propose two distributed computing platforms, i. e., high-performance computing(HPC) based platform and hardware-in-theloop(HIL) testbed, to validate and evaluate the proposed algorithm. The computation and communication performances of the proposed algorithm are quantified and analyzed on typical IEEE test systems. Experimental results indicate that the proposed algorithm can be executed on a fully distributed computing structure and yields accurate ACOPF solution. Besides, the proposed algorithm has a low communication overhead.

关键词： Distributed convex optimization distributed en-ergy management system optimal power flow primal-dual de-composition

Enabling Inverter-based Resource Stability Control in Power Systems with High Renewable Penetration

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 1248-1250页

作者： Joe H.chow Rensselaer Polytechnic Institute TroyNY 12180-3590USA

This rapid communication provides the author’s viewpoints on the need to develop grid stability functions for inverter-based resources,in particular,controls to enhance system *** discussion will be focused on transi... 详细信息

关键词： Frequency regulation inverter control time scales transient stability

Model testing of tripod caisson foundations in silty clay subjected to eccentric lateral loads

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Frontiers of Structural and Civil Engineering 2023年第3期17卷 467-476页

作者： Shili MA Liquan XIE Tsung-chow SU College of Civil Engineering Tongji UniversityShanghai 200092China Department of Ocean and Mechanical Engineering Florida Atlantic UniversityBoca RatonFL 33431USA

In this study,model tests were conducted to investigate the bearing capacities of tripod caisson foundations subjected to eccentric lateral loads in silty *** load–rotation curves of five eccentric-shaped tripod suction foundations were plotted to analyze the bearing capacities at different loading *** was observed that the loading angle significantly influenced the bearing capacity of the foundations,particularly for eccentric tripod caisson *** with eccentric tripod caisson foundations,the traditional tripod foundation has a relatively high ultimate lateral capacity at the omnidirectional loading *** analyzing the displacement of the caissons,a formula for the rotational center of the tripod caisson foundation subjected to an eccentric lateral load was *** depth of the rotation center was 0.68–0.92 times the height of the caisson when the bearing capacity reached the *** the undrained condition,suction was generated under the lid of the“up-lift”caisson,which helps resist lateral forces from the wind and waves.

关键词： tripod caisson foundation silty clay eccentric lateral capacity model tests