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Evaluation of county-level poverty alleviation progress by deep learning and satellite observations

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Big Earth Data 2021年第4期5卷 576-592页

作者： yanxiao Jiang Liqiang Zhang Yang Li Jintai Lin Jingwen Li Guoqing Zhou Suhong liu Jing Cao Zhiqiang Xiao State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijingChina Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijingChina Guangxi Key Laboratory of Spatial Information and Geomatics Guilin University of TechnologyGuangxiChina School of Economics and Management Tsinghua UniversityBeijingChina Faculty of Geographical Science Beijing Normal UniversityBeijing100875China

Poverty alleviation is one of the greatest challenges faced by low-income and middle-income ***,which had the largest rural poverty-stricken population,has made tremendous efforts in alleviating poverty especially since the implementation of the targeted poverty alleviation(TPA)policy in 2014,and by 2020,all national poverty-stricken counties(NPCs)have been out of *** study combines deep learning with multiple satellite datasets to estimate county-level economic develop-ment from 2008 to 2019 and assess the effect of the TPA policy for 592 national poverty-stricken counties(NPCs)at country,provincial and county *** capita gross domestic product(GDP)is used to measure the affluence *** 2014 through 2019,the 592 NPCs experience an average growth rate of per capita GDP at 7.6%±0.4%,higher than the average growth rate of 310 adjacent non-NPC counties(7.3%±0.4%)and of the whole country(6.3%).We also reveal 42 counties with weak growth recently and that the average affluence level of the NPCs in 2019 is still much lower than the national or provincial *** inexpensive,timely and accurate method proposed here can be applied to other low-income and middle-income countries for affluence assessment.

关键词： Poverty alleviation remote sensing imagery deep learning county level

CO adsorption on a Pt(111) surface partially covered with FeO_x nanostructures

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Journal of Energy Chemistry 2017年第4期26卷 602-607页

作者： Yun liu Fan Yang yanxiao Ning Qingfei liu Yi Zhang Hao Chen Xinhe Bao State Key Laboratory of Catalysis CAS Center for Excellence in NanoscienceCollaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences

The adsorption of CO on Pt group metals, as a most fundamental elementary reaction step, has been widely studied in catalysis and electrocatalysis. Particularly, the structures of CO on Pt(111) have been extensively investigated, owing to its importance to both fundamental and applied catalysis. Yet, much less is known regarding CO adsorption on a Pt(111) surface modulated by supported oxide nanostructures,which is of more relevance to technical catalysis. We thus investigated the coverage-dependent adsorption of CO on a Pt(111) surface partially covered by Fe Oxnanostructures, which has been demonstrated as a remarkable catalyst for low-temperature CO oxidation. We found that, due to its strong chemisorption, the coverage-dependent structure of CO on bare Pt is not influenced by the presence of Fe Ox. But,oxygen-terminated Fe Oxnanostructures could modulate the diffusivity of CO at their vicinity, and thus affect the formation of ordered CO superstructures at low temperatures. Using scanning tunneling microscopy(STM), we inspected the diffusivity of CO, followed the phase transitions of CO domains, and resolved the molecular details of the coverage-dependent CO structures. Our results provide a full picture for CO adsorption on a Pt(111) surface modulated by oxide nanostructures and shed lights on the inter-adsorbate interaction on metal surfaces.

关键词： CO adsorption STM FeO Pt(111) Adsorbate structure

Operando surface science methodology reveals surface effect in charge storage electrodes

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National Science Review 2021年第3期8卷 70-77页

作者： Chao Wang yanxiao Ning Haibo Huang Shiwen Li Chuanhai Xiao Qi Chen Li Peng Shuainan Guo Yifan Li Conghui liu Zhong-Shuai Wu Xianfeng Li Liwei Chen Chao Gao Chuan Wu Qiang Fu State Key Laboratory of Catalysis iChEMDalian Institute of Chemical PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science &Engineering Beijing Institute of Technology

Surface and interface play critical roles in energy storage devices,calling for operando characterization techniques to probe the electrified surfaces/*** this work,surface science methodology,including electron spectroscopy and scanning probe microscopy,has been successfully applied to visualize electrochemical processes at operating electrode surfaces in an Al/graphite model *** of anions together with cations is directly observed in the surface region of a graphite electrode with tens of nanometers thickness,the concentration of which is one order higher than that in *** intercalation pseudocapacitance mechanism and a double specific capacity in the electrode surface region are expected based on the super-dense intercalants and anion/cation co-intercalation,which are in sharp contrast to the battery-like mechanism in the electrode *** distinct electrochemical mechanism at the electrode surface is verified by performance tests of real battery devices,showing that a surface-dominant,nanometer-thick graphite cathode outperforms a bulk-dominant,micrometer-thick graphite *** findings highlight the important surface effect of working electrodes in charge storage systems.

关键词： surface science methodology aluminum ion battery operando characterization surface effect

Effect of Calcium Treatment During Production on Quality of Stored Huangguan Pear Fruit

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Agricultural Biotechnology 2019年第2期8卷 188-190页

作者： Tiezheng liu Xueying LI yong LI Guosheng liu Jingtao WANG Yongbo WANG Yali FU yanxiao HAN Shijiazhuang Fruit Institute Hebei Academy of Agriculture and Forestry Sciences Shijiazhuang Academy of Agricultural and Forestry Sciences

The effect of calcium treatment during production on the quality(soluble solids, fruit firmness, soluble sugar content, titratable acid content, etc.) of Huangguan pear was studied. The results showed that the calcium treatment during production improved the comprehensive quality of Huangguan pear fruit, delayed and reduced the occurrence of browning of fruit core, and enhanced its storage effect in the cold storage. Therefore, the calcium treatment improved the quality of stored pear fruit.

关键词： Calcium treatment Huangguan pear Storage

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生物医用NiTi形状记忆合金腐蚀研究进展

稀有金属材料与工程 2021年第11期50卷 4165-4173页

作者：刘明李军张延晓薛玉娜西安交通大学材料科学与工程学院微纳尺度材料行为研究中心陕西西安710049 长安大学材料科学与工程学院陕西西安710061 无锡口腔医院口腔正畸科江苏无锡214000 西安石油大学材料科学与工程学院陕西西安710065

镍钛形状记忆合金(NiTi-SMA)具有较好的耐腐蚀和机械性能,在口腔和临床医学中有着大量而广泛的应用。NiTi-SMA腐蚀后释放Ni^(2+)会引发细胞毒性和过敏反应,进一步提高NiTi-SMA的耐蚀性是目前生物医学材料领域发展的核心之一。本文对近... 详细信息

镍钛形状记忆合金(NiTi-SMA)具有较好的耐腐蚀和机械性能,在口腔和临床医学中有着大量而广泛的应用。NiTi-SMA腐蚀后释放Ni^(2+)会引发细胞毒性和过敏反应,进一步提高NiTi-SMA的耐蚀性是目前生物医学材料领域发展的核心之一。本文对近年来国内外有关口腔医学和临床医学中常用NiTi-SMA的腐蚀研究现状进行了总结,同时也对NiTi-SMA增材制造及表面改性技术进行了评述,以期为开发高性能抗腐蚀生物医用NiTi-SMA提供一定的指导。

关键词： NiTi-SMA 生物医用腐蚀增材制造表面改性

Fine mapping and validation of a stable QTL for thousand-kernel weight in wheat(Triticum aestivum L.)

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The Crop Journal 2023年第5期11卷 1491-1500页

作者： Deyuan Meng Aamana Batool Yazhou Xuan Ruiqing Pan Na Zhang Wei Zhang Liya Zhi Xiaoli Ren Wenqing Li Jijie Li yanxiao Niu Shuzhi Zheng Jun Ji Xiaoli Shi Lei Wang Hongqing Ling Chunhua Zhao Fa Cui Xigang liu Junming Li Liqiang Song Center for Agricultural Resources Research Institute of Genetics and Developmental BiologyThe Innovative Academy of Seed DesignChinese Academy of SciencesShijiazhuang 050022HebeiChina Ministry of Education Key Laboratory of Molecular and Cellular Biology Hebei Research Center of the Basic Discipline of Cell BiologyHebei Key Laboratory of Molecular and Cellular BiologyCollege of Life SciencesHebei Normal UniversityShijiazhuang 050024HebeiChina State Key Laboratory of North China Crop Improvement and Regulation College of AgronomyHebei Agricultural UniversityBaoding 071000HebeiChina State Key Laboratory of Plant Cell and Chromosome Engineering Chinese Academy of SciencesBeijing 100101China Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in Universities of Shandong School of AgricultureLudong UniversityYantai 264025ShandongChina Hebei Collaboration Innovation Center for Cell Signaling Shijiazhuang 050024HebeiChina College of Life Science University of Chinese Academy of SciencesBeijing 100049China

Thousand-kernel weight(TKW)is a measure of grain weight,a target of wheat *** object of this study was to fine-map a stable quantitative trait loci(QTL)for TKW and identify its candidate gene in a recombinant inbred line(RIL)population derived from the cross of Kenong 9204(KN9204)and Jing411(J411).On a high-density genetic linkage map,24,26 and 25 QTL were associated with TKW,kernel length(KL),and kernel width(KW),respectively.A major and stable QTL,QTkw-2D,was mapped to an8.3 cM interval on chromosome arm *** saturation of polymorphic markers in its target region,QTkw-2D was confined to a 9.13 Mb physical interval using a secondary mapping population derived from a residually heterozygous line(F6:7).This interval was further narrowed to 2.52 Mb using QTkw-2D near-isogenic lines(NILs).NILs~(KN9204)had higher fresh and dry weights than NILsJ411at various grain-filling *** TKW and KW of NILs~(KN9204)were much higher than those of NILsJ411in field *** comparison of both DNA sequence and expression between KN9204 and J411,TraesCS2D02G460300.1(TraesKN2D01HG49350)was assigned as a candidate gene for *** was confirmed by RNA sequencing(RNA-seq)of QTkw-2D *** results provide the basis of map-based cloning of QTkw-2D,and DNA markers linked to the candidate gene may be used in marker-assisted selection.

关键词： Wheat Thousand-kernel weight Fine mapping Candidate gene

An isotopic dilution GC-MS/MS method for PBDEs analysis in soil

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An isotopic dilution GC-MS/MS method for PBDEs analysis in s...

乙酰丙酮钙催化剂催化合成甲基丙烯酸二甲氨基乙酯

2018年中国质谱学术大会（CMSC2018）

作者： Ge Yin Mufei Li yanxiao Zhou Jun Fan Guohua Zhu Taohong Huang Jinsong liu Shimadzu (China) Co. LTD. Zhejiang Province Environmental Monitoring Center Zhejiang University of Technology

Background: Polybrominated diphenyl ethers(PBDEs) have been one of the most widely used flame retardants in the past decades. Due to the persistency, bioaccumulation and adverse effect to humans, the environmental exposure and toxicity of PBDEs cause great concern1,2. To date, commercial PentaBDE, OctaBDE and DecaBDE have been listed as persistent organic pollutants(POPs) in Stockholm Convention. Material and methods: In the present study, an effective isotopic dilution coupled with triple quadrupole mass spectrometer(GC-MS/MS) method was established to determine 26 PBDEs simultaneously in soil by using MRM mode. The sample pretreatment refers to EPA 1614 method. In brief, surrogate standard, containing thirteen 13 Clabelled PBDEs(MDBE-MXG) was spiked to soil(10 g) before accelerated solvent extraction. The samples were clean-up by a multi-layer silica gel column. Volumetric standard(MBDE-ISS-G) was added to vials in prior to instrumental analysis. A programmed voltage method was set to increase the sensitivity of highly PBDE congeners, in particular for BDE-209. Results and conclusion: The regression coefficient of each congener was over 0.999, indicating good linearity within the range of 1-500 ng/mL, 2-800 ng/mL and 5-2000 ng/mL for di-BDE-penta-BDE, hexa-BDE-octa-BDE and nona, deca-BDE, respectively. The precision was evaluated by injection the lowest calibration point 6 times in a row, and the coefficient of variance of peak area for each congener was below 16%. The limit of detection was in the range of 0.05-3.02 ng/mL. Among five soil samples, BDE-209 was the predominated congener, contributing to over 90% of total PBDEs. The recovery of isotopic 13 C-labelled surrogate standard was 60.3-107.6%. Our results imply that the method is robust, with low limit of detection for analysis 26 PBDEs(including BDE-209) in soil.

关键词： BDE-209 GC-MS/MS MRM isotopic dilution soil

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石油化工 2007年第2期36卷 137-141页

作者：陈彦逍刘绍英王公应中国科学院成都有机化学研究所

以CaCl2和乙酰丙酮为原料，在碱性条件下合成了乙酰丙酮钙催化剂；通过元素分析、红外光谱和^1H核磁共振表征确证了所制得的乙酰丙酮钙催化剂的结构。并将乙酰丙酮钙催化剂用于催化甲基丙烯酸甲酯（MMA）与二甲氨基乙醇（DMAE）进行酯... 详细信息

以CaCl2和乙酰丙酮为原料，在碱性条件下合成了乙酰丙酮钙催化剂；通过元素分析、红外光谱和^1H核磁共振表征确证了所制得的乙酰丙酮钙催化剂的结构。并将乙酰丙酮钙催化剂用于催化甲基丙烯酸甲酯（MMA）与二甲氨基乙醇（DMAE）进行酯交换反应合成甲基丙烯酸二甲氨基乙酯（DMA），研究了乙酰丙酮钙催化剂用量、原料配比、反应时间对酯交换反应的影响。实验结果表明。与传统的均相催化剂相比，乙酰丙酮钙催化剂对酯交换反应的催化活性和选择性高，当乙酰丙酮钙用量为DMAE质量的1．2％、n（MMA）：n（DMAE）=2．5、反应时间6h、反应温度98～110℃时，DMAE转化率为98．5％，DMA收率为96．7％。乙酰丙酮钙催化剂重复使用4次后，DMA选择性下降了17．1％。

关键词：乙酰丙酮钙甲基丙烯酸甲酯二甲氨基乙醇酯交换催化甲基丙烯酸二甲氨基乙酯

3D打印NiTi形状记忆合金在模拟不同口腔环境中电化学腐蚀行为研究

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中国腐蚀与防护学报 2023年第4期43卷 781-786页

作者：刘明王杰朱春晖张延晓西安交通大学材料科学与工程学院金属材料强度国家重点实验室西安710049 陕西周医生口腔医疗有限公司西安710086 西安交通大学口腔医院牙周科西安710004 无锡口腔医院口腔正畸科无锡214000

采用测量开路电位、极化曲线、电化学阻抗谱和Mott-Schottky方法研究了3D打印NiTi合金在不同人工唾液环境中的电化学腐蚀行为。结果表明,在纯人工唾液环境中,随着浸泡时间的延长,3D-NiTi合金的开路电位正移,合金的热力学稳定性提高,合... 详细信息

采用测量开路电位、极化曲线、电化学阻抗谱和Mott-Schottky方法研究了3D打印NiTi合金在不同人工唾液环境中的电化学腐蚀行为。结果表明,在纯人工唾液环境中,随着浸泡时间的延长,3D-NiTi合金的开路电位正移,合金的热力学稳定性提高,合金表现为典型的金属钝化极化特征,在人工唾液中可形成耐蚀稳定的钝化膜。添加可乐后,合金的热力学稳定性降低,极化曲线向左下方移动,自腐蚀电位负移,自腐蚀电流密度增大。添加1%NaF后,合金的热力学稳定性急剧降低,表现为活化腐蚀状态,钝化膜的缺陷数增加了3.7倍,F-可极大地破坏钝化膜的完整性。

关键词： 3D-NiTi 人工唾液可口可乐 F- 电化学阻抗谱