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Multi-temporal analysis of past and future land cover change in the highly urbanized state of Selangor,Malaysia

Ecological Processes 2022年第1期11卷 93-107页

作者： Majid Azari Lawal Billa andy chan Department of Civil Engineering University of Nottingham MalaysiaJalan Broga43500 SemenyihSelangorMalaysia School of Environmental and Geographical Sciences University of Nottingham MalaysiaJalan BrogaSelangor 43500 SemenyihMalaysia

Background:This study analysed the multi-temporal trend in land cover,and modelled a future scenario of land cover for the year 2030 in the highly urbanized state of Selangor,*** study used a Decision Forest-Markov chain model in the land change modeller(LCM)tool of TerrSet *** cover maps of 1999,2006 and 2017 were classified into 5 classes,namely water,natural vegetation,agriculture,built-up land and cleared land.A simulated land cover map of 2017 was validated against the actual land cover map *** Area Under the Curve(AUC)value of 0.84 of Total Operating Characteristics(TOC)and higher percentage of components of agreement(Hits+Correct rejection)compared to components of disagreement(Misses+False alarm+Wrong hits)indicated successful validation of the ***:The results showed between the years 1999 to 2017 there was an increase in built-up land cover of 608.8 km^(2)(7.5%),and agricultural land 285.5 km^(2)(3.5%),whereas natural vegetation decreased by 831.8 km^(2)(10.2%).The simulated land cover map of 2030 showed a continuation of this trend,where built-up area is estimated to increase by 723 km^(2)(8.9%),and agricultural land is estimated to increase by 57.2 km^(2)(0.7%),leading to a decrease of natural vegetation by 663.9 km^(2)(8.1%)for the period 2017 to *** spatial trend of land cover change shows built-up areas mostly located in central Selangor where the highly urbanized and populated cities of Kuala Lumpur and Putrajaya and the Klang valley are ***:The future land cover modelling indicates that built-up expansion mostly takes place at edges of existing urban *** results of this study can be used by policy makers,urban planners and other stakeholders for future decision making and city planning.

关键词： Land cover modelling Land use and land cover Land change modeller Markov chain model Selangor Malaysia

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香港地区中学文凭考试英语口语实施网考的探索研究

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中国考试 2024年第2期 47-55页

作者： Cameron Smart Jennifer Shiu Matthew Drysdale andy chan 吴泓霖(译) 香港考试及评核局中国香港999077 教育部教育考试院北京100084

香港地区中学文凭考试(Hong Kong Diploma of Secondary Education Examination,HKDSE)英语口语公开考试中的小组互动部分受疫情等多种因素的影响而无法正常开展,需要探索其他口试形式。本研究探讨使用基于网络的协作视频会议工具Zoom... 详细信息

香港地区中学文凭考试(Hong Kong Diploma of Secondary Education Examination,HKDSE)英语口语公开考试中的小组互动部分受疫情等多种因素的影响而无法正常开展,需要探索其他口试形式。本研究探讨使用基于网络的协作视频会议工具Zoom进行网考口试(Internet-delivered Speaking Test)的可能性方案。选取40名中学生进行网考口试的试测,由经验丰富的口试考官对考生表现进行评分,并使用基于学习者语料库的方法研究口试考生在话轮转换和语法准确性方面的表现。通过对考生话语的语言分析,以及从考生处和考官处分别收集的反馈结果,证实网考口试是可靠且可行的。

关键词：香港地区中学文凭考试口语测试网考口试面对面口试

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中国露天生物质燃烧的温室气体排放及秸秆禁燃政策的协同减排效应

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环境科学学报 2022年第10期42卷 160-169页

作者：朱永慧黄凌李瑜敏段炼王杨君 Maggie Chel Gee Ooi andy chan 李莉上海大学环境与化学工程学院上海200444 上海大学悉尼工商学院上海201800 上海理工大学环境与建筑学院上海200093 诺丁汉大学马来西亚分校土木工程系马来西亚999004 马来西亚国立大学气候变化研究所马来西亚999004

露天生物质燃烧是温室气体(CO_(2)、CH_(4)、N_(2)O)的重要排放源之一,这些排放可影响本地、区域和全球的大气化学和气候变化,并带来一系列生态环境问题,进而对人类及其他生物的生存环境产生影响.本研究采用卫星火点排放清单(FINN),对20... 详细信息

露天生物质燃烧是温室气体(CO_(2)、CH_(4)、N_(2)O)的重要排放源之一,这些排放可影响本地、区域和全球的大气化学和气候变化,并带来一系列生态环境问题,进而对人类及其他生物的生存环境产生影响.本研究采用卫星火点排放清单(FINN),对2010-2019年中国露天生物质燃烧温室气体排放进行研究,并分析秸秆禁燃政策对温室气体排放的影响,对后续秸秆禁燃政策的制定具有重要参考价值.结果表明,我国2010-2019年平均年温室气体排放量为1.53×10^(8) t(将CH_(4)和N_(2)O的温室效应换算为同等效应的CO_(2)当量单位),总体呈波动性下降趋势.温室气体排放量最大的植被类型是森林(7.43×10^(7) t)和农作物(3.19×10^(7) t),分别占总排放量的48.7%和20.9%.从月分布来看,露天生物质燃烧排放的温室气体集中在2-6月,3月是高峰值.从空间分布上看,排放主要集中在华南、西南和华东地区,占总排放量的72.9%.从2013年以来,秸秆禁燃政策的加强在一定程度上降低了露天农作物秸秆燃烧排放的温室气体和PM_(2.5).从变化量看,28个省份实现了秸秆燃烧排放的温室气体与PM_(2.5)同步下降.

关键词：露天生物质燃烧排放清单(FINN) 温室气体秸秆禁燃政策

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Nonlinear analysis of pre-tensioned glass wall facade by stability function with initial imperfection

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Frontiers of Structural and Civil Engineering 2010年第3期4卷 376-382页

作者： Siu-Lai chan Yaopeng LIU andy LEE Department of Civil and Structural Engineering The Hong Kong Polytechnic UniversityHong KongChina Ove Arup and Partners(Hong Kong)Limited Hong KongChina

Pre-tensioned high strength trusses using alloy steel bar are widely used as glass wall supporting systems because of the high degree of *** breakage of glass panes in this type of system occurs occasionally,likely to be due to error in design and analysis in addition to other factors like glass impurity and stress concentration around opening in a spider *** design does not consider the flexibility of supports from finite stiffness of supporting steel or reinforced concrete *** resistance of lateral wind pressure of the system makes use of high tension force coupled with the large deflection effect,both of which are affected by many parameters not generally considered in conventional *** the design,one must therefore give a careful consideration on various effects,such as support settlement due to live loads and material creep,temperature change,pre-tension force,and wind *** is not uncommon to see many similar glass wall systems fail in the wind load test chambers under a design wind *** paper presents a rigorous analysis and design of this type of structural systems used in a project in Hong Kong,*** stability function with initial curvature is used in place of the cubic function,which is only accurate for linear *** considerations and analysis techniques are believed to be of value to engineers involved in the design of the structural systems behaving nonlinearly.

关键词： tension system glass wall nonlinear analysis pre-tensioning second-order analysis

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Microstructure and texture evolution during warm compression of the magnesium alloy AZ31

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Science China(Technological Sciences) 2009年第1期52卷 186-189页

作者： GODFREYB andy Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University

The evolution of the microstructure and texture with strain during compression at 150℃ of the magnesium alloy AZ31 has been investigated using the electron backscattered diffraction (EBSD) technique. The initial samples were chosen to have a strong basal plane texture with the crystal c-axes perpendicular to the compression direction. The EBSD data provide evidence concerning the relative activity of both {10-12} extension twinning and slip, and suggest that non-basal slip is important in samples deformed to a strain of more than 0.2. The relative contributions of the twinning and the slip during deformation have been discussed based on the results above.

关键词： AZ31 electron backscattered diffraction (EBSD) texture slip twinning

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Microbial resistance to nanotechnologies:An important but understudied consideration using antimicrobial nanotechnologies in orthopaedic implants

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Bioactive Materials 2022年第10期7卷 249-270页

作者： Zhuoran Wu Brian chan Jessalyn Low Justin Jang Hann Chu Hwee Weng Dennis Hey andy Tay Institute of Health Innovation&Technology National University of Singapore117599Singapore Department of Biomedical Engineering National University of Singapore117583Singapore Biosafety Level 3 Core Facility Yong Loo Lin School of MedicineNational University of Singapore117599Singapore Department of Microbiology and Immunology Yong Loo Lin School of MedicineNational University of Singapore117545Singapore Infectious Disease Programme Yong Loo Lin School of MedicineNational University of Singapore117547Singapore Institute of Molecular and Cell Biology 35 Agency for ScienceTechnology and Research138673Singapore National University Health System National University of Singapore119228Singapore Tissue Engineering Programme National University of Singapore117510Singapore

Microbial resistance to current antibiotics therapies is a major cause of implant failure and adverse clinical outcomes in orthopaedic *** developments in advanced antimicrobial nanotechnologies provide numerous opportunities to effective remove resistant bacteria and prevent resistance from occurring through unique *** tunable physicochemical properties,nanomaterials can be designed to be bactericidal,antifouling,immunomodulating,and capable of delivering antibacterial compounds to the infection region with spatiotemporal *** its substantial advancement,an important,but under-explored area,is potential microbial resistance to nanomaterials and how this can impact the clinical use of antimicrobial *** review aims to provide a better understanding of nanomaterial-associated microbial resistance to accelerate bench-to-bedside translations of emerging nanotechnologies for effective control of implant associated infections.

关键词： Bacterial infection Orthopaedic implant Microbial resistance Nanomaterial Antimicrobial nanotechnology

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Ultra-large aluminum shape casting:Opportunities and challenges

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China Foundry 2024年第5期21卷 397-408页

作者： Qi-gui Wang andy Wang Jason Coryell Advanced Materials Technology&Virtualization GM Global Technical CenterWarrenMI USA

Ultra-large aluminum shape castings have been increasingly used in automotive vehicles,particularly in electric vehicles for light-weighting and vehicle manufacturing cost *** most of them are structural components subject to both quasi-static,dynamic and cyclic loading,the quality and quantifiable performance of the ultra-large aluminum shape castings is critical to their success in both design and *** paper briefly reviews some application examples of ultra-large aluminum castings in automotive industry and outlines their advantages and *** affecting quality,microstructure and mechanical properties of ultra-large aluminum castings are evaluated and discussed as aluminum shape casting processing is very complex and often involves many competing mechanisms,multi-physics phenomena,and potentially large uncertainties that significantly influence the casting quality and *** analysis and mechanical property assessment of an ultra-large aluminum shape casting are *** are highlighted and suggestions are made for robust design and manufacturing of ultra-large aluminum castings.

关键词： ultra-large castings aluminum light-weighting quality microstructure materials properties

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Mechanics and safety issues in tailing-based backfill:A review

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1165-1178页

作者： Xu Zhao andy Fourie Chong-chong Qi School of Civil Environmental and Mining EngineeringUniversity of Western AustraliaPerth 6009Australia School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Voids(referred to as "stopes") are generally created during underground mining activities and can lead to both local and regional geotechnical instabilities. To assist in managing the stability of mining-related voids and improving the recovery of orebodies, tailing-based backfill technology has been widely used around the world. In the design of tailing-based backfill strategy, the specific function and engineering requirements of the filling are intimately dependent on the stress distribution within the backfilled stope. In this paper, the main mechanics involved in tailing-based backfill in underground mines, which include arching, consolidation, hydration process, and movement of surrounding rocks, are reviewed. Research on the safety of a barricade and stability of an exposed fill face are also presented. In conclusion, the backfilling process should be performed on the basis of a better understanding of the complicated interactions of the mechanisms of filling, consolidation, and hydration process(when cement is added).

关键词： tailing-based backfill arching consolidation barricade safety

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Abnormal liver function tests associated with severe rhabdomyolysis

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World Journal of Gastroenterology 2020年第10期26卷 1020-1028页

作者： andy KH Lim Department of General Medicine Monash Health Department of Medicine School of Clinical Sciences Monash University

Rhabdomyolysis is a syndrome of skeletal muscle injury with release of cellular constituents such as potassium,phosphate,urate and intracellular proteins such as myoglobin into the circulation,which may cause complications including acute kidney injury,electrolyte disturbance and cardiac *** liver function tests are frequently observed in cases of severe ***,there is an increase in serum aminotransferases,namely aspartate aminotransferase and alanine *** raises the question of liver injury and often triggers a pathway of investigation which may lead to a liver ***,muscle can also be a source of the increased aminotransferase *** review discusses the dilemma of finding abnormal liver function tests in the setting of muscle injury and the potential implications of such an *** delves into some of the clinical and experimental evidence for correlating muscle injury to raised aminotransferases,and discusses pathophysiological mechanisms such as oxidative stress which may cause actual liver *** aminotransferases lack tissue specificity to allow clinicians to distinguish primary liver injury from muscle *** review also explores potential approaches to improve the accuracy of our diagnostic tools,so that excessive or unnecessary liver investigations can be avoided.

关键词： Rhabdomyolysis Muscle Creatine kinase Liver function tests Alanine aminotransferase Aspartate aminotransferase Aminotransferases

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Self-catalyst synthesis of aligned ZnO nanorods by pulsed laser deposition

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Science China(Physics,Mechanics & Astronomy) 2009年第2期52卷 207-211页

作者： LEN Song-En andy University of Maryland at College Park College Park Maryland USA

High-density well-aligned ZnO nanorods were successfully synthesized on ZnO-buffer-layer coated indium phosphide (InP) (100) substrates by a pulsed laser deposition (PLD) method. Scanning electron microscopy images show that the ZnO buffer layer formed uniform drip-like structure and ZnO nano- rods were well-oriented perpendicular to the substrate surface. The sharp diffraction peak observed at 34.46° in X-ray diffraction scanning pattern suggests that the ZnO nanorods exhibit a (002)-preferred orientation. The PL spectra of ZnO samples shows a strong near band edge emission centered at about 380 nm and a weak deep level emission centered at around 495 nm, and it demonstrates that the ZnO nanorods produced in this work have high optical quality, which sheds light on further applications for nanodevices.

关键词： ZnO nanorods buffer-layer self-catalyst pulsed laser deposition

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