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| 1 | The impact of meteorological changes from 2013 to 2017 on PM2.5 mass reduction in key regions in China显示文摘In 2013,China issued the'Action Plan for the Prevention and Control of Air Pollution'('Ten Statements of Atmosphere')and implemented a series of pollution reduction measures from 2013 to 2017.In key regions of China,the mass concentrations of particulate matter with aerodynamic equivalent diameters less than 2.5μm(PM2.5)have dropped significantly.However,the contributions of meteorological changes to PM2.5 reduction are largely uncertain,which has attracted particular concern from the government and the public.Here,we investigated the impact of large-scale and boundary layer(BL)meteorological conditions on aerosol pollution and estimated the contributions of meteorological changes to PM2.5 reduction based on in-depth analysis and diagnosis of various observed meteorological elements and an integrated pollution-linked meteorological index(PLAM,which is approximately and linearly related to PM mass concentration).In this study,we found that the meteorological conditions worsened in 2014 and 2015 and improved in 2016 and 2017 relative to those in 2013 in key regions in China.In 2017 relative to 2013,only^5%(approximately 13%of the total PM2.5 decline)of the 39.6%reduction in PM2.5 mass concentrations can be attributed to meteorological changes in the Beijing-Tianjin-Hebei(BTH)region,and only^7%(approximately 20%of the total PM2.5 decline)of the 34.3%reduction can be attributable to meteorological changes in the Yangtze River Delta(YRD)region.Overall,the PM2.5 reduction due to meteorological improvement is much lower than the observed PM2.5 reduction in these areas,which indicates that emission reduction during the five-year implementation of the'Ten Statements of Atmosphere'is the dominant factor in the improvement in air quality.The changes in meteorology and climate are conducive to PM2.5 reduction but do not dominate the substantial improvement in air quality.Similar to the above regions,in the Pearl River Delta(PRD)region,the impact of meteorological changes on the annual averaged PM2.5 concentration from 2013 to2017 was relatively weak,and the PM2.5 reduction was mainly due to emission reductions.During winter 2017(January,February,and December of this year),the meteorological conditions improved-20%in the BTH region(observed total PM2.5reduction:40.2%)and-30%in the YRD region(observed total PM2.5 reduction:38.2%)relative to those in 2013,showing the meteorological factors played more important role in the decrease of PM2.5 in winter of these years in the two regions,respectively.The meteorological conditions in winter 2016 were 14%better than those in winter 2017,but the PM2.5 reduction in winter 2016 was still less than that in winter 2017,reinforcing the significant contributions of the increasing efforts to reduce PM2.5 emissions in 2017.The substantial progress of strict emission measures was also confirmed by a comparison of several persistent heavy aerosol pollution episodes(HPEs)with similar meteorological conditions.It is found that the decrease of PM2.5mass caused by emission reduction increases year by year,especially the decrease of PM2.5 concentration in 2016 and 2017.In China,HPEs mainly occur in winter,when meteorological conditions are approximately 40-100%worse than in other seasons.This worsening is partly due to the harbor effect of high topography,including downdrafts and the weak wind zone,and partly due to the increasingly stable regional BL structure caused by climate warming.For the formation of HPEs,it occurred under regional stagnant and stable conditions associated with upper-level circulation patterns,including the zonal westerly winds type and high-pressure ridges.After pollution formation,PM2.5 with mass accumulated to a certain degree can further worsen the BL meteorological conditions.The feedback effect associated with worsening conditions dominates PM2.5 mass explosive growth.In the context of high air pollutant emissions in China,unfavorable meteorological conditions are the necessary external conditions for the formation and accumulation of HPEs.Therefore,reducing aerosol pollution significantly during the earlier transport stage is critical in reducing persistent HPEs.Currently,even under favorable meteorological conditions,allowing emissions without restriction is also not advisable because aerosol pollution allowed to accumulate to a certain extent will significantly worsen the BL meteorological conditions and close the'meteorological channels'available for pollution dispersion. | Xiaoye ZHANG Xiangde XU Yihui DING Yanju LIU Hengde ZHANG Yaqiang WANG Junting ZHONG | 2019 | Science China Earth Sciences2019，62，12： | 42 |
| 2 | Diffuse Intrinsic Pontine Gliomas Exhibit Cell Biological and Molecular Signatures of Fetal Hindbrain-Derived Neural Progenitor Cells显示文摘Diffuse intrinsic pontine glioma(DIPG) is the main cause of brain tumor-related death among children.Until now, there is still a lack of effective therapy with prolonged overall survival for this disease. A typical strategy for preclinical cancer research is to find out the molecular differences between tumor tissue and para-tumor normal tissue, in order to identify potential therapeutic targets. Unfortunately, it is impossible to obtain normal tissue for DIPG because of the vital functions of the pons.Here we report the human fetal hindbrain-derived neural progenitor cells(pontine progenitor cells, PPCs) as normal control cells for DIPG. The PPCs not only harbored similar cell biological and molecular signatures as DIPG glioma stem cells, but also had the potential to be immortalized by the DIPG-specific mutation H3 K27 M in vitro. These findings provide researchers with a candidate normal control and a potential medicine carrier for preclinical research on DIPG. | Yu Sun Cheng Xu Changcun Pan Xin Chen Yibo Geng Yuliang Wu Peng Zhang Wenhao Wu Yu Wang Deling Li Zhen Wu Junting Zhang Qiaoran Xi Liwei Zhang | 2019 | Neuroscience Bulletin2019，35，2： | 2 |
| 3 | Temperature rising elution fractionation of PP/PE alloy and thermal behavior of the fractions显示文摘 | Junting Xu Zhisheng Fu | 2002 | European Polymer2002，38，9： | 1 |
| 4 | Effect of the structure on the morphology and spherulitic growth kinetics of polyolefin in-reactor alloys 显示文摘 | XU Junting FU Zhisheng WANG Xianping | 2005 | J Appl Polym Sci2005，98，2： | 1 |
| 5 | Influence ofthe reaction conditions on the solid-state graft copolymeri-zation of methyl methacrylate and polyethylene/polypro-pylene in situ alloys显示文摘 | Fu Zhisheng Xu Junting Jiang Guoxin | 2005 | Journal of Applied Polymer Sci-ence2005，98，1： | 1 |
| 6 | Cold Ex- trusion Forming of Copper/aluminum Clad Com- posite显示文摘 | Luo Junting Xu Yan Zhao Shuangjing | 2009 | Internal journal of Apply Mechanic and Materials2009，1619，： | 1 |
| 7 | Cooperative effect of elec trospinning and nanoclay on formation of polar crystalline pha ses in poly(vinylidene fluoride)显示文摘 | Liu Yiliao Li Ying Xu Junting | 2010 | ACS Applied Materials & Interfaces2010，2，6： | 1 |
| 8 | Influence ofElectron Donors on the Tacticity and the Composition Distribu- tion of Propylene-Butene Copolymers Produced by Supported Ziegler-Natta Catalysts 显示文摘 | Xu Junting Feng Linxian Yang Shilin | 1997 | Macromolecules1997，30，25： | 1 |
| 9 | Strong influences of cocatalyst on ethylene/propylene copolymerization with a MgCl2/SiO2/TiCl4/diester type Ziegler-Natta catalyst显示文摘 | DONG Qi FU Zhisheng XU Junting | 2007 | European Polymer Journal2007，43，8： | 1 |
| 10 | Strong influences of cocatalyst on ethylene/propylene copolymerization with a MgCl2/SiO2/TiCl4/diester type Ziegler-Natta catalyst显示文摘 | Dong Qi Fu Zhisheng Xu Junting | 2007 | European Polymer Journal2007，43，8： | 1 |
| 11 | Influence of electrondonors on the tacticity and the composition distribution of propylene-butene copolymers produced by supported ziegler-nattacatalysts显示文摘 | Xu Junting Feng Linxian Yang Shilin | 1997 | Macromolecules1997，30，25： | 1 |
| 12 | Influence of Electron Donors on the Tacticity and the Composition Distribution of Propylene-Butene Copolymers Produced by Supported Ziegler-Natta Catalysts显示文摘 | Xu Junting Feng Linxian Yang Shilin | 1997 | Macromolecules1997，30，25： | 1 |
| 13 | Temperature Rising Elution Fractionation of Polypropylene Produced by Heterogeneous Ziegler-Natta Catalysts显示文摘 | Xu Junting Feng Linxian Yang Shilin | 1998 | Eur Polym J1998，34，34： | 1 |
| 14 | Effect of substrate and molecular weight on the stability of thin films of semierystalline block copolyrners 显示文摘 | Liang Guodong Xu Junting Fan Zhiqiang | 2007 | Langmuir2007，23，7： | 1 |
| 15 | Influence ofelectron donors on the tacticity and the composition distributionof propylene-butene copolymers produced by supportedZiegler-Natta catalysts显示文摘 | Xu Junting Feng Linxian Yang Shilin | 1997 | Macromolecules1997，30，25： | 1 |
| 16 | Competition of crys- talline and liquid crystalline moieties in self-assembly of poly ( oxyethylene ) cholesterol ethers 显示文摘 | Xu junting Xue liang Fan zhiqiang | 2006 | Macromole- cules2006，39，： | 1 |
| 17 | The inflammation-based scores to predict prognosis of patients with hepatocellular carcinoma after hepatectomy显示文摘 | Junting Huang Li Xu Yaoling Luo Fengying He Yaojun Zhang Minshan Chen | 2014 | Medical Oncology2014，，4： | 1 |
| 18 | Structure and properties of polypropylene/poly(ethylene-co-propylene) in-situ blends synthesized by spherical Z-N catalyst显示文摘 | Fan Zhiqiang Zhang Yanzhong Xu Junting | 2001 | Polymer2001，42，13： | 1 |
| 19 | Exploration about superior anti-counterfeiting ability of Sm^(3+) doped KSr_(2)Nb_(5)O_(15) photochromic ceramics:Origin and atomic-scale mechanism显示文摘Reversible luminescence modulation behavior upon the photochromic effect endows the photochromic ceramics with 3reat potential in anti-counterfeiting and data storage applications.Here,Sm^(3+)-doped KSr_(2)Nb_(5)O_(15) photochromic ceramics exhibit superior anti-counterfeiting ability:good covertness and considerable modulation ratio of luminescent emission intensity after photochromic reaction.The results show that the photochromism originated from oxygen and cation vacancies,which were directly identified by electron paramagnetic resonance and positron annihilation lifetime spectra.Unexpectedly,oxygen vacancies work more effectively than cation vacancies during photochromic reactions.Moreover,the extraordinary anti-counterfeiting ability was attributed to the high energy transfer rate,which was particularly caused by the short mean distance below 1 nm between the Sm^(3+) and vacancies.The work here has provided atomic-scale structural evidence and made a progress in understanding the photochromic origins and mechanism in color-center theory. | Shuyao Cao Jiatong Zhu Qian Chen Junting Liu Changying Wu Leilei Li Jie Xu Haixue Yan Feng Gao | 2022 | Journal of Materiomics2022，8，1： | 1 |
| 20 | Application of temperature rising elution fractionation in polyolefins显示文摘 | Xu Junting Feng Linxian | 2000 | European Polymer Journal2000，36，5： | 1 |
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