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High resolution aerosol optical thickness retrieval over the Pearl river Delta region with improved aerosol modelling

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science China Earth sciences 2009年第10期52卷 1641-1649页

作者： WONG Mansing nichol Janet LEE Kwon Ho Department of Land surveying and Geo-Informatics The Hong Kong Polytechnic University Earth system science Interdisciplinary Center University of Maryland (UMD)

Aerosol retrieval algorithms for the MODerate resolution Imaging spectroradiometer (MODIs) have been developed to estimate aerosol and microphysical properties of the atmosphere, which help to address aerosol climatic issues at global scale. However, higher spatial resolution aerosol products for urban areas have not been well researched mainly due to the difficulty of differentiating aerosols from bright surfaces in urban areas. Here, a new aerosol retrieval algorithm using the MODIs 500 m resolution images is described, to retrieve aerosol properties over Hong Kong and the Pearl river Delta region. The rationale of our technique is to first estimate the aerosol reflectance by decomposing the top-of-atmosphere reflectance from surface reflectance and rayleigh path reflectance. For the determination of surface reflectance, a modified Minimum reflectance Technique (MrT) is used, and MrT images are computed for different seasons. A strong correlation is shown between the surface reflectance of MrT images and MODIs land surface reflectance products (MOD09), with a value of 0.9. For conversion of aerosol reflectance to Aerosol Optical Thickness (AOT), comprehensive Look Up Tables (LUT) are constructed, in which aerosol properties and sun-viewing geometry in the radiative transfer calculations are taken into account. Four aerosol types, namely mixed urban, polluted urban, dust, and heavy pollution, were derived using cluster analysis on three years of AErONET measurements in Hong Kong. Their aerosol properties were input for LUT calculation. The resulting 500 m AOT images are highly correlated (r = 0.89) with AErONET sunphotometer observations in Hong Kong. This study demonstrates the applicability of aerosol retrieval at fine resolution scale in urban areas, which can assist the study of aerosol loading distribution and the impact of localized and transient pollution on urban air quality. In addition, the MODIs 500 m AOT images can be used to study cross-boundary aeroso

关键词： aerosol retrieval aerosol optical thickness AErONET MODIs satellite image

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Iron-Catalysed C(sp^(2))-H Borylation with Expanded Functional Group Tolerance

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Chinese Journal of Chemistry 2022年第24期40卷 2875-2881页

作者： Luke Britton Jamie H.Docherty Gary s.nichol Andrew P.Dominey stephen P.Thomas EastCHEM school of Chemistry University of EdinburghEdinburghEH93FJ United Kingdom GsK Medicines research Centre StevenageSG12NY United Kingdom

Arene C(sp^(2))-H bond borylation offers direct and efficient access to aryl boronic *** in situ catalyst activation and photoirradiation,the iron-catalysed C(sp^(2))-H borylation reaction of carboarenes,pyrroles,and indoles has been developed using only bench-stable pre-catalysts and *** functional group tolerance was observed including those not reported using previous methods(ArNH_(2),ArOH,Arsir_(3),ArP(O)(O)_(2),ArC(O)Nr_(2)).Mechanistic studies revealed iron-catalysed reductive deoxygenation,C—F protodefluorination,and a demethylation of aryl methyl ethers by C—O sigma bond hydroboration.

关键词： Iron Earth-abundant C-H borylation Boron Photochemistry

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{[re6（μ3-se8）（PEt3）5Cl]sbF6·Et2O}的合成与晶体结构

{[Re6（μ3-Se8）（PEt3）5Cl]SbF6·Et2O}的合成与晶体结构

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中国化学会第28届学术年会

作者：梁凯汪学忞 Gary s.nichol 郑智平东华大学化学化工与生物工程学院 Department of Chemistry University of Arizona

＜正＞以[re6（μ3-se）8]2+为核的原子簇化合物由于其多变的结构吸引了化学家的关注[1]。我们报道一个新的原子簇化合物{[re6（μ3-se8）（PEt3）5Cl]***2O}。X-射线单晶结构测定显示该化合物属单斜晶系,空间群

关键词：原子簇单晶结构

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走向天堂

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风景园林 2008年第6期15卷 84-87页

作者：无舒婷婷（翻译）北京林业大学城市规划与设计专业2006级硕士生北京100083

我们必须打理好自家花园，照顾好自己。“走向天堂”是第11届威尼斯建筑双年展上展出的一个小园林，它激发人们的想象力，探寻家庭花园的维护方法。在理想世界里，人们需要智慧以及寻求智慧的欲望来照顾好自己的生活。法语“Jardin sec... 详细信息

我们必须打理好自家花园，照顾好自己。“走向天堂”是第11届威尼斯建筑双年展上展出的一个小园林，它激发人们的想象力，探寻家庭花园的维护方法。在理想世界里，人们需要智慧以及寻求智慧的欲望来照顾好自己的生活。法语“Jardin secret”（花园秘密）是每个人私密和受保护的那部分灵魂。

关键词：天堂家庭花园维护方法威尼斯想象力智慧

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DEsIGN OF PID CONTrOLLEr FOr BOOsT CONVErTEr WITH rHs ZErO

DESIGN OF PID CONTROLLER FOR BOOST CONVERTER WITH RHS ZERO

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第4届国际电力电子及运动控制国际会议

作者： s.Arulselvi G.Uma M.Chidambaram Department of Electrical and Electronics Engg. College of EngineeringAnna University Chennai-600 025India Department of Electrical and Electronics Engg. College of EngineeringAnna University Chennai-600 025India Department of Chemical Engineering Indian Institute of Technology Madras Chennai-600 032India

＜正＞ This paper gives a new solution for controlling boost converter that exhibits Inverse response （Ir） due to the presence of right Hand side （rHs） Zero. The rHs Zero ηimposes a limit on the attainable closed-loop bandwidth of the controlled converter thereby reducing the controller gain Kc. In this paper a comparative study is made by introducing different controller tuning methods such as Internal Model Control （IMC）, synthesis, Equating Co-efficient and Ziegler-nichol.s （Z-N）techniques applicable to voltage control of dc-dc boost converter. The paper also presents closed loop simulation results of the converter for load regulation and line fluctuation. The results reveal that, synthesis method gives superior performance in terms of lowest IsE value.

关键词： Lambda (λ) right Hand side (rHs) zero η Proportional gain Kc Integral time τJ Derivative time τD Tuning Parameter α closed loop initial jump φ Integral square Error(IsE) .

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