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Examining effective use of data sources and modeling algorithms for improving biomass estimation in a moist tropical forest of the Brazilian Amazon

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International Journal of Digital Earth 2017年第10期10卷 996-1016页

作者： Yunyun Feng Dengsheng Lu qi chena Michael Keller Emilio Moran Maiza Nara dos-Santos Edson Luis Bolfe Mateus Batistella The Nurturing Station for the State Key Laboratory of Subtropical Silviculture Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang ProvinceSchool of Environmental&Resource SciencesZhejiang Agriculture and Forestry UniversityLin AnPeople’s Republic of China Center for Global Change and Earth Observations Michigan State UniversityEast LansingMIUSA Department of Geography University of Hawaii at ManoaHonoluluHIUSA Brazilian Agricultural Research Corporation–Embrapa Informática Agropecuária CampinasBrazil USDA Forest Service International Institute of Tropical ForestryRio PiedrasPRUSA Brazilian Agricultural Research Corporation–Embrapa Secretariat of Intelligence and Macro StrategyBrasíliaBrazil Brazilian Agricultural Research Corporation(Embrapa) BrasíliaBrazil

Previous research has explored the potential to integrate lidar and optical data in aboveground biomass(AGB)estimation,but how different data sources,vegetation types,and modeling algorithms influence AGB estimation is poorly *** research conducts a comparative analysis of different data sources and modeling approaches in improving AGB ***-based spectral responses and textures,lidar-derived metrics,and their combination were used to develop AGB estimation *** results indicated that(1)overall,RapidEye data are not suitable for AGB estimation,but when AGB falls within 50–150 Mg/ha,support vector regression based on stratification of vegetation types provided good AGB estimation;(2)Lidar data provided stable and better estimations than RapidEye data;and stratification of vegetation types cannot improve estimation;(3)The combination of lidar and RapidEye data cannot provide better performance than lidar data alone;(4)AGB ranges affect the selection of the best AGB models,and a combination of different estimation results from the best model for each AGB range can improve AGB estimation;(5)This research implies that an optimal procedure for AGB estimation for a specific study exists,depending on the careful selection of data sources,modeling algorithms,forest types,and AGB ranges.

关键词： Lidar RapidEye aboveground biomass moist tropical forest support vector regression random forest linear regression stratification

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Amorphous molybdenum sulfide mediated EDTA with multiple active sites to boost heavy metal ions removal

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Chinese Chemical Letters 2021年第9期32卷 2797-2802页

作者： qi Huang Yizhong Zhang Wei Zhou Xiang Huang Yiliang chena Xin Tan Tao Yu School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China School of Science Tibet UniversityLhasa 850000China School of Science Tianjin UniversityTianjin 300350China Research Center of Environmental Pollution Control Engineering Technology Chinese Research Academy of Environmental SciencesBeijing 100012China

The rational design of strong affinity adsorbents for heavy metal ions removal remains a critical challenge for water *** this study,amorphous molybdenum sulfide composites(EDTA-MoSx(x=2,3))were fabricated via a facile hydrothermal method mediated by EDTA,which was applied to heavy metal ions(Cu^(2+),Cd^(2+),Pb^(2+),Zn^(2+)and Ni^(2+))removal from aqueous solutions.A case study for Cu^(2+)ions showed that the adsorption capacity of EDTA-MoSx(x=2,3)was superior to crystalline phase MoS2 at pH 6.0 with an initial concentration of 200 mg/*** mechanisms of different sulfide groups and—COOH of EDTA-MoSx(x=2,3)were verified systematically via a series of experiments,characterizations,and density functional theory(DFT)*** bridging S_(2)^(2-)and—COOH covalently bonded with Cu^(2+)ions were ascribed to the critical factors for this enhanced removal efficiency on the surface of EDTA-MoSx(x=2,3).This work offers a new method to enhance the adsorption performance of molybdenum sulfide-based materials by controlling crystallinity mediated with an organic complex small molecule.

关键词： Amorphous phase MoS_(2) MoS_(3) Adsorption Heavy metal ions DFT calculations

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X-MOL: large-scale pre-training for molecular understanding and diverse molecular analysis

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Science Bulletin 2022年第9期67卷 899-902,M0003页

作者： Dongyu Xue Han Zhang Xiaohan chena Dongling Xiao Yu kang Gonga Guohui Chuai Yu Sun Hao Tian Hua Wu Yukun Li qi Liu These authors contributed equally to this work.a Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine Shanghai East HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji UniversityShanghai 200092China Shanghai Research Institute for Intelligent Autonomous Systems Shanghai 201210China Department of Natural Language Processing Baidu Inc.Beijing 100085China

In silico modeling and analysis of small molecules substantially accelerates the process of drug development. Representing and understanding molecules is the fundamental step for various in silico molecular analysis t... 详细信息

关键词： accelerate analysis development

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Boosting Li-ion storage in Li2MnO_(3) by unequal-valent Ti4+-substitution and interlayer Li vacancies building

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Chinese Chemical Letters 2023年第4期34卷 564-569页

作者： Yu Tian Yuling Zhao Fanqi Meng Kaicheng Zhang Yanyuan qi Yujie Zeng Congcong Cai Yuli Xiong Zelang Jian Yang Sun Lin Gu Wen chena School of Materials Science and Engineering Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China C Innovation Laboratory Contemporary Amperex Technology Ltd.(CATL)Ningde 352100China Institute of Physics Chinese Academy of SciencesBeijing 100190China Sanya Science and Education Innovation Park of Wuhan University of Technology Wuhan 430070China

Lithium rich layered oxide(LRLO) has been considered as one of the promising cathodes for lithium-ion batteries(LIBs). The high voltage and large capacity of LRLO depend on Li2MnO_(3)phase. To ameliorate the electrochemical performance of Li2MnO_(3), also written as Li(Li1/3Mn2/3)O_(2), we propose a strategy to substitute Mn4+and Li+in Mn/Li transition metal layer with Ti4+, which can stabilize the structure of Li2MnO_(3)by inhibiting the excessive oxidation of O_(2)-above 4.5 V. More significantly, the unequal-valent substitution brings about the emergence of interlayer Li vacancies, which can promote the Li-ion diffusion based on the enlarged interlayer and increase the capacity by activating the Mn3+/4+redox. We designed Li0.7[Li1/3Mn2/3]0.7Ti0.3O_(2)with high interlayer Li vacancies, which presents a high capacity(290 m Ah/g at 10 m A/g) and stable cycling performance(84% over 60 cycles at 50 m A/g). We predict that this strategy will be helpful to further improve the electrochemical performance of LRLOs.

关键词： Lithium-ion batteries Li2MnO_(3) Unequal-valent Ti4+-substitution Interlayer Li vacancies Activated Mn3+/4+redox

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Exercise attenuates angiotensinⅡ-induced muscle atrophy by targeting PPARγ/miR-29b

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Journal of Sport and Health Science 2022年第6期11卷 696-707,F0003页

作者： qi Liu Liyang Chen Xuchun Liang Yuqing Cao Xinyue Zhu Siqi Wang Jin Li Juan Gao Junjie Xiao Cardiac Regeneration and Ageing Lab Institute of Cardiovascular SciencesSchool of Life ScienceShanghai UniversityShanghai 200444China Shanghai Engineering Research Center of Organ Repair School of MedicineShanghai UniversityShanghai 200444China

Background:Exercise is beneficial for muscle *** proliferator-activated receptor gamma(PPARγ) and microRNA-29 b(miR-29 b) have been reported to be responsible for angiotensinⅡ(AngⅡ)-induced muscle ***,it is unclear whether exercise can protect AngⅡ-induced muscle atrophy by targeting PPARγ/miR-29 ***:Skeletal muscle atrophy in both the control group and the run group was established by AngⅡ infusion;after 1 week of exercise training,the mice were sacrificed,and muscle weight was *** size was measured by hematoxylin-eosin and wheat-germ agglutinin *** was evaluated by terminal deoxynucleotidyl transferase dUTP nick end labeling *** expression level of muscle atrogenes,including F-box only protein 32(FBXO32,also called Atrogin-1) and muscle-specific RING-finger 1(MuRF-1),the phosphorylation level of protein kinase B(PKB,also called AKT)/forkhead box 03 A(FOX03 A)/mammalian target of rapamycin(mTOR) pathway proteins,the expression level of PPARγ and apoptosis-related proteins,including B-cell lymphoma-2(Bcl-2),Bcl-2-associated X(Bax),cysteine-aspartic acid protease 3(caspase-3),and cleaved-caspase-3,were determined by western *** expression level of miR-29 b was checked by reversetranscription quantitative polymerase chain reaction.A PPARγ inhibitor(T0070907) or adeno-associated virus serotype-8(AAV8)-mediated miR-29 b overexpression was used to demonstrate whether PPARγ activation or miR-29 b inhibition mediates the beneficial effects of exercise in AngⅡ-induced muscle ***:Exercise can significantly attenuate AngⅡ-induced muscle atrophy,which is demonstrated by increased skeletal muscle weight,cross-sectional area of myofiber,and activation of AKT/mTOR signaling and by decreased atrogenes expressions and *** AngⅡ-induced muscle atrophy mice models,PPARγ was elevated whereas miR-29 b was decreased by *** protective effects of exercise in AngⅡ-induced muscle atrop

关键词： AngiotensinⅡ Exercise Muscle atrophy PPARg miR-29b

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MnO_x/MWCNTs低温氨选择性催化还原NO_x硫中毒机理

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物理化学学报 2012年第9期28卷 2175-2182页

作者：罗红成黄碧纯付名利吴军良叶代启华南理工大学环境科学与工程学院广州510006 华南理工大学工业聚集区污染控制与生态修复教育部重点实验室广州510006

以经过浓硝酸和等离子体放电预处理后的多壁碳纳米管(MWCNTs)为载体,锰氧化物(MnOx)为活性组分,采用等体积浸渍法制备MnOx/MWCNTs催化剂.利用热重分析(TGA)、扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、程序升温还原... 详细信息

以经过浓硝酸和等离子体放电预处理后的多壁碳纳米管(MWCNTs)为载体,锰氧化物(MnOx)为活性组分,采用等体积浸渍法制备MnOx/MWCNTs催化剂.利用热重分析(TGA)、扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、程序升温还原/脱附(TPR/TPD)以及傅里叶变换红外(FTIR)光谱对催化剂进行表征,探讨SO2对催化剂低温氨选择性催化还原(SCR)NOx活性的影响及SO2中毒机理.结果表明,低温下SO2对MnOx/MWCNTs催化剂活性有明显毒化作用.反应温度越高,SO2浓度越大,催化剂SCR活性下降越快.活性中心Mn原子硫酸化是催化剂失活的主要原因.另外,催化剂表面生成硫酸铵盐以及SO2对NO吸附的抑制作用也一定程度上造成了催化剂的失活.

关键词：多壁碳纳米管选择性催化还原二氧化硫中毒机理

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