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Validation of MODIS and Deep Blue aerosol optical depth retrievals in an arid/semi-arid region of northwest China

Particuology 2012年第1期10卷 132-139页

作者： Xia Li Xiangao Xia Shengli Wang Jietai mao yan Liu LAGEO Institute of Atmospheric Physics ChineseAcademy of Sciences Beijing 100029 China Institute of Desert Meteorology China Meteorology Administration Urumqi 830002 China Xinjiang Climate Center Urumqi 830002 China School of Physics Peking University Beil＇ing 100871 China

The global aerosol optical depth （AOD or r） has been retrieved using the Dark Target algorithm （the C004 and C005 products） and the Deep Blue algorithm （DB product）. Few validations have thus far been performed in arid/semi-arid regions, especially in northwest China. The ground-based remote sensing of AOD from sun photometers at four sites in Xinjiang during the years 2002-2003 is used to validate aerosol products, including C004, C005 and DB of the Moderate Resolution Imaging Spectroradiometer （MODIS）. The results show substantial improvement in the C005 aerosol product over the C004 product. The average correlation coefficient of regression with ground measurements increased from 0.59 to 0.69, and the average offset decreased from 0.28 to 0.13. The slopes of the linear regressions tended to be close to unity. The percentage of AODs falling within the retrieval errors of 30% （or Δτ = ±0.1 ± 0.2τ） increased from 16.1% to 45.6%. The best retrievals are obtained over an oasis region, whereas the worst are obtained over urban areas. Both the MODIS C004 and C005 products overestimate AOD, which is likely related to improper assumptions of the aerosol model and of the estimation of surface reflectance. An encouraging result has been derived with regard to validation of the DB AOD. Overall, the average offset, slope and correlation coefficient of regression with sun-photometer measurements are -0.04, 0.88 and 0.85, respectively. Approximately 73% of the DB AOD retrievals fall within the expected error of 30%. Underestimation of the AOD by the DB products is observed. The aerosol model and estimations of surface reflectance in this region require further improvements.

关键词： MODISSun-photometerAerosol optical depthDeep blue algorithm

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Understanding the Moon's internal structure through moonquake observations and remote sensing technologies

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Science China Earth Sciences 2018年第8期61卷 995-1006页

作者： Weifeng HAO Fei LI Chi XIAO Jianguo yan mao YE Chinese Antarctic Center of Surveying and Mapping Wuhan University State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University

Explorations for the interior structure of the Moon mainly involve three technologies: the early gravitational observations via circumlunar satellites, the moonquake observations during the Apollo period, and the recent high-resolution remote sensing observations. Based on these technologies, we divided the development of the moon's interior structure into three stages. The first stage is the discovery of high-density anomalous masses(mascons) on the lunar surface with the low-order gravitational field models, which were obtained by observing perturbations of the early lunar orbital satellites. The second stage is the preliminary understanding of the layer structure with the help of moonquake observations during the Apollo period. The third stage is the deep understanding of the structure of the lunar crust, mantle, and core, with the use of high-resolution remote sensing data and the reassessment of moonquake data from the Apollo's mission. This paper gave detailed introduction and comments on different observation technologies, gathered data, and data processing techniques used at the three stages. In addition, this paper analyzed the current issues in the researches on the Moon's internal structure and discussed the prospects for future explorations.

关键词： Moon Mascon Moonquake Remote sensing Lunar internal structure

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SYNTHESIS OF AROMATIC DIAMINE-BASED BENZOXAZINES AND EFFECT OF THEIR BACKBONE STRUCTURE ON THERMAL AND FLAMMABILITY PROPERTIES OF POLYMERS

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Chinese Journal of Polymer Science 2013年第10期31卷 1359-1371页

作者： Tao Zhang Hong-qiang yan Zheng-ping Fang mao Peng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Department of Packaging Engineering College of Materials and Textiles Zhejiang Sci-tech University Lab of Polymer Materials and Engineering Ningbo Institute of Technology Zhejiang University

Three kinds of novel aromatic diamine-based benzoxazines containing naphthalene, propane-2,2-diyldibenzene and neopentyl groups in the backbone, respectively （designated as BAPNCP, BAPBACP and BAPNPGCP, respectively）, were synthesized and characterized. In addition, the effects of backbone structures on curing behaviors of the monomers and thermal and flammability properties of the resulting polymers were systematically studied. The results indicated that BAPNPGCP displayed the highest enthalpy of the curing reaction associated with the ring-opening of benzoxazine, which was due to the effect of benzoxazine ring content per unit mass. Interestingly, the 5 wt% weight loss temperature and char residue after thermogravimetric test for poly（BAPNPGCP） were 8 ℃ and 7% higher than those of poly（BAPBACP）. Meanwhile, the total heat release of poly（BAPNPGCP） was less than half of that for poly（BAPBACP）, indicating the substantial effect of benzoxazine ring content on flammability and char formation. Furthermore, it was found that poly（BAPNCP） gave the best thermal stability and flame retardancy, which was due to the synergistic effect between naphthalene group and benzoxazine ring content. This study provides new insight into the curing behavior of benzoxazine and further understanding on the high performance of polybenzoxazine.

关键词： Aromatic diamine-based benzoxazine Thermal properties Flammability properties.

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Research progress on the source, production, and anti-cancer mechanisms of paclitaxel

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Chinese Journal of Natural Medicines 2020年第12期18卷 890-897页

作者： yanG yan-Hua mao Jia-Wang TAN Xiao-Li Institute of Life Sciences Jiangsu UniversityZhenjiang 212013China

Paclitaxel,a tetracyclic diterpenoid compounds,was firstly isolated from the bark of the Pacific yew ***,as a low toxicity,high efficiency,and broad-spectrum natural anti-cancer drug,paclitaxel has been widely used against ovarian cancer,breast cancer,uterine cancer,and other *** the matter of fact,natural paclitaxel from Taxus species has been proved to be environmentally unsustainable and economically *** this reason,researchers from all over the world are devoted to searching for new ways of obtaining *** present,other methods,including artificial cultivation of Taxus plants,microbial fermentation,chemical synthesis,tissue and cell culture have been sought and developed ***,the biosynthesis of paclitaxel is also an extremely attractive *** other anti-cancer drugs,paclitaxel has its unique anti-cancer ***,the source,production,and anti-cancer mechanisms of paclitaxel were summarized and reviewed,which can provide theoretical basis and reference for further research on the production,anti-cancer mechanisms and utilization of paclitaxel.

关键词： Paclitaxel(Taxol) Source Production methods Anti-cancer mechanisms

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Comments on ‘FNIP1 regulates adipocyte browning and systemic glucose homeostasis in mice by shaping intracellular calcium dynamics'

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Journal of Molecular Cell Biology 2022年第5期14卷 60-62页

作者： Yujing Yin Dengqiu Xu yan mao Zhenji Gan State Key Laboratory of Pharmaceutical Biotechnology and MoE Key Laboratory of Model Animal for Disease Study Division of Spine SurgeryDepartment of Orthopedic SurgeryNanjing Drum Tower HospitalThe Affiliated Hospital of Nanjing University Medical SchoolJiangsu Key Laboratory of Molecular MedicineChemistry and Biomedicine Innovation Center(ChemBIC)Model Animal Research CenterNanjing University Medical SchoolNanjing UniversityNanjing 210061China

Owing to its remarkable benefits on metabolic health and its demonstrated presence in adult humans,beige or‘brite'adipocytes holdgreatpromiseto combat obesity and metabolic *** of the mechanisms involved inadipocyte... 详细信息

关键词： adipocyte homeostasis obesity

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Kinetics of Magnesium Slag Leaching by NH_(4)Cl

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Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 787-793页

作者： mao Shuaidong LIU yan ZHANG Ting'an School of Metallurgy Northeastern UniversityShenyang110819China Key Laboratory of Ecological Metallurgy of Multi—metal Intergrown Ores of Ministry of Education Shenyang110819China

The leaching kinetics of magnesium slag in ammonium chloride solutions was *** effects of initial ammonium chloride concentration,liquid-solid ratio and reaction temperature on the leaching rate of calcium were *** results showed that the leaching rate increased with the increase in initial ammonium chloride concentration,reaction temperature and liquid-solid *** was determined that the leaching rate fit the Avrami equation,and the leaching process was controlled by *** activation energy was 13.22 kJ/mol.

关键词： magnesium slag leaching kinetics ammonium chloride extracting

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Oxidative Molecular Layer Deposition Tailoring Eco-Mimetic Nanoarchitecture to Manipulate Electromagnetic Attenuation and Self-Powered Energy Conversion

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Nano-Micro Letters 2023年第9期15卷 224-237页

作者： Jin-Cheng Shu yan-Lan Zhang Yong Qin mao-Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Institute of Coal Chemistry State Key Laboratory of Coal ConversionChinese Academy of Sciences27 Taoyuan South RdTaiyuan 030001ShanxiPeople’s Republic of China

Advanced electromagnetic devices,as the pillars of the intelligent age,are setting off a grand transformation,redefining the structure of society to present pluralism and ***,the bombardment of electromagnetic radiation on society is also increasingly serious along with the growing popularity of"Big Data".Herein,drawing wisdom and inspiration from nature,an eco-mimetic nanoarchitecture is constructed for the first time,highly integrating the advantages of multiple components and structures to exhibit excellent electromagnetic *** electromagnetic properties and internal energy conversion can be flexibly regulated by tailoring microstructure with oxidative molecular layer deposition(oMLD),providing a new cognition to frequency-selective microwave *** optimal reflection loss reaches≈−58 dB,and the absorption frequency can be shifted from high frequency to low frequency by increasing the number of oMLD ***,a novel electromagnetic absorption surface is designed to enable ultra-wideband absorption,covering almost the entire K and Ka *** importantly,an ingenious self-powered device is constructed using the eco-mimetic nanoarchitecture,which can convert electromagnetic radiation into electric energy for *** work offers a new insight into electromagnetic protection and waste energy recycling,presenting a broad application prospect in radar stealth,information communication,aerospace engineering,etc.

关键词： Oxidative molecular layer deposition Eco-mimetic nanoarchitecture Microwave absorption Electromagnetic attenuation Self-powered energy conversion device

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Preparation of homogeneously dispersed and highly concentrated double-walled carbon nanotubes as catalyst support

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Rare Metals 2016年第4期35卷 337-343页

作者： Ming-mao Li Zi-Ping Wu Man Zhao Wei-Bo Zhang Ying-yan Hu yan-Hong Yin Engineering Research Institute Jiangxi University of Science and Technology

In this study, double-walled carbon nanotubes （DWCNTs） in ethylene glycol （EG） and N,N-dimethyl- formamide （DMF） media were investigated by a simple ultrasonication method. Homogeneously dispersed and highly concentrated DWCNTs are in EG （95 vol%） and DMF （5 vol%） media without the addition of surfactant. Surface structure and crystallinity of DWCNTs undergo minimal change. The highly concentrated dispersion state of DWCNTs helps in Pt loading. Pt particles prepared in the homogenous dispersion system have small sizes and are uniformly distributed. The prepared Pt catalysts display a similar electrochemical activity to catalysts pre- pared in EG system with low concentration. The results demonstrate that homogenously dispersed and highly concentrated DWCNTs can realize mass production of Pt/ DWCNT catalysts with high electrochemical activity and low cost.

关键词： Double-walled carbon nanotubes Catalystsupport Pt/DWCNT catalysts Ultrasonication

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Output Feedback Controller Design for Discrete-time Switched Singular Systems

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Journal of Harbin Institute of Technology(New Series) 2013年第6期20卷 53-58页

作者： mao Wang yan-Ling Wei Jia Shi Space Control and Inertial Technology Research Center Harbin Institute of Technology

This paper is concerned with the problems of robust admissibility and static output feedback( SOF)stabilization for a class of discrete-time switched singular systems with norm-bounded parametric *** objective is to design a suitable robust SOF controller guaranteeing the regularity,causality and asymptotic stability of the resulting closed-loop system under arbitrary switching laws. Based on the basic matrix inequality sufficient condition for checking the admissibility of switched singular systems,together with some matrix inequality convexifying techniques,the SOF controller synthesis is developed for the underlying systems. It is shown that the controller gains can be obtained by solving a set of strict linear matrix inequalities( LMIs). A simulation example is given to show the effectiveness of the proposed method.

关键词： switched singular systems parameter uncertainties arbitrary switching robust static output feedback controlCLC number:TP273 Document code:AArticle ID:1005-9113(2013)06-0053-06

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A single-mask dry-release process for fabrication of high aspect ratio SOI MEMS devices

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Science China(Technological Sciences) 2013年第2期56卷 387-391页

作者： yanG ZhenChuan WEI YuMin mao Xu yan GuiZhen National Key Laboratory of Science and Technology on Micro/Nano Fabrication Institute of MicroelectronicsPeking University

A single-mask dry-release process for fabrication of high aspect ratio SOI MEMS devices is presented,which takes advantage of the lag effect in silicon DRIE(deep reactive ion etching).The wide trenches and the releasing holes are etched to the buried oxide in the first-step DRIE whereas the narrow trenches are still connected due to the lag *** the buried oxide is removed by wet etching through the opened releasing holes and wide trenches,the narrow trenches are etched through by the second-step *** only can the sticking problems be avoided,but also the footing effect during the DRIE can be partially *** feasibility of the proposed technique was verified by implementing a capacitive *** scale factor and the non-linearity of the fabricated accelerometer were measured to be 63.4 mV/g and 0.1% with the measurement range of ±1 g,respectively.

关键词： SOI dry release lag effect accelerometer footing effect

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