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Divergent response of vegetation phenology to extreme temperatures and precipitation of different intensities on the Tibetan Plateau

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Science China Earth Sciences 2023年第10期66卷 2200-2210页

作者： Mai SUN Peng LI peixin ren Jiayi TANG Cicheng ZHANG Xiaolu ZHOU Changhui PENG School of Geographic Sciences Hunan Normal UniversityChangsha410081China Department of Biology Sciences Institute of Environment SciencesUniversity of Quebec at MontrealMontrealH3C 3P8Canada

Quantifying how climate factors affect vegetation phenology is crucial for understanding climate-vegetation interactions and carbon and water cycles under a changing ***,the effects of different intensities of extreme climatic events on vegetation phenology remain poorly *** a long-term solar-induced chlorophyll fluorescence dataset,we investigated the response of vegetation phenology to extreme temperatures and precipitation events of different intensities across the Tibetan Plateau(TP)from 2000 to *** found that the effect of maximum temperature exposure days(TxED)and minimum temperature exposure days(TnED)on the start of the growing season(SOS)was initially delayed and shifted to advance along the increasing temperature ***,the response of the end of the growing season(EOS)to TxED and TnED shifted from an advance to a delay with increasing temperature gradients until the temperature thresholds were reached,above which thresholds produced an unfavorable response to vegetation growth and brought the EOS to an early *** corresponding maximum and minimum temperature thresholds were 10.12 and 2.54℃,*** contrast,cumulative precipitation(CP)was more likely to advance SOS and delay EOS as the precipitation gradient increased,but the advance of SOS is gradually *** vegetation types(i.e.,forest,shrubland,meadow,and steppe)showed similar trends in response to different climates,but the optimal climatic conditions varied between the vegetation ***,meadow and steppe had lower optimal temperatures and precipitation than forest and *** findings revealed the divergent responses of vegetation phenology to extreme climate events of different intensities,implying that the SOS will continue to advance with warming,whereas the EOS may undergo a partial transformation from delayed areas to advanced areas with continued warming.

关键词： Vegetation phenology Extreme climates Optimal climate Solar-induced chlorophyll fluorescence Tibetan Plateau

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Strong controls of daily minimum temperature on the autumn photosynthetic phenology of subtropical vegetation in China

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Forest Ecosystems 2021年第3期8卷 413-424页

作者： peixin ren Zelin Liu Xiaolu Zhou Changhui Peng Jingfeng Xiao Songhan Wang Xing Li Peng Li College of Geographic Science Hunan Normal UniversityChangsha 410081China Department of Biology Sciences Institute of Environment SciencesUniversity of Quebec at MontrealC.P.8888Succ.Centre-VilleMontreal H3C 3P8Canada Earth Systems Research Center Institute for the Study of EarthOceansand SpaceUniversity of New HampshireDurhamNH 03824USA International Institute for Earth System Sciences Nanjing UniversityNanjing 210023China Jiangsu Provincial Key Laboratory of Geographic Information Technology Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural ResourcesSchool of Geography and Ocean ScienceNanjing UniversityNanjing 210023China

Background:Vegetation phenology research has largely focused on temperate deciduous forests,thus limiting our understanding of the response of evergreen vegetation to climate change in tropical and subtropical ***:Using satellite solar-induced chlorophyll fluorescence(SIF)and MODIS enhanced vegetation index(EVI)data,we applied two methods to evaluate temporal and spatial patterns of the end of the growing season(EGS)in subtropical vegetation in China,and analyze the dependence of EGS on preseason maximum and minimum temperatures as well as cumulative *** results indicated that the averaged EGS derived from the SIF and EVI based on the two methods(dynamic threshold method and derivative method)was later than that derived from gross primary productivity(GPP)based on the eddy covariance technique,and the time-lag for EGSsif and EGSevi was approximately 2 weeks and 4 weeks,*** found that EGS was positively correlated with preseason minimum temperature and cumulative precipitation(accounting for more than 73%and 62%of the study areas,respectively),but negatively correlated with preseason maximum temperature(accounting for more than 59%of the study areas).In addition,EGS was more sensitive to the changes in the preseason minimum temperature than to other climatic factors,and an increase in the preseason minimum temperature significantly delayed the EGS in evergreen forests,shrub and ***:Our results indicated that the SIF outperformed traditional vegetation indices in capturing the autumn photosynthetic phenology of evergreen forest in the subtropical region of *** found that minimum temperature plays a significant role in determining autumn photosynthetic phenology in the study *** findings contribute to improving our understanding of the response of the EGS to climate change in subtropical vegetation of China,and provide a new perspective for accurately evaluating the role played by evergreen vegetatio

关键词： Carbon cycle Evergreen vegetation Plant phenology Solar-induced Fluorescence Climate change MODIS Eddy covariance

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某水厂水源置换工程水文地质条件及评价

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河南水利与南水北调 2023年第5期52卷 45-46页

作者：葛仁涛陈艳朋任沛鑫陈平货河南省水利勘测有限公司河南郑州450003 河南永固岩土工程有限公司河南开封475000

开封市第二水厂水源置换工程新打深600 m水源井12眼,对现有水源进行置换,设计供水能力2万m^(3)/d,输水管道长约2.65 km。通过对工程区地层岩性、地下水补排条件的论述以及对抽水试验、水质分析成果的分析,提出了第二水厂的水源含水层为... 详细信息

开封市第二水厂水源置换工程新打深600 m水源井12眼,对现有水源进行置换,设计供水能力2万m^(3)/d,输水管道长约2.65 km。通过对工程区地层岩性、地下水补排条件的论述以及对抽水试验、水质分析成果的分析,提出了第二水厂的水源含水层为新近系深层地下水,水源地面积约50.24 km^(2),单位涌水量Q=4 m^(3)/(h·m),调蓄能力巨大。并强调加强对地表水、地下水的监测,掌握水质与水量的动态变化,保证水源地的水资源良性延续。

关键词：第二水厂水源置换工程水文地质条件评价

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血清转化生长因子β和Periostin蛋白水平与非瓣膜性心房颤动的关系及其作用机制研究

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实用心脑肺血管病杂志 2020年第4期28卷 23-27页

作者：任佩欣武亚琳樊钰林鑫杨慧宇山西医科大学第二医院心内科山西省太原市030000

背景Periostin蛋白是一种高度保守的功能蛋白,目前关于血清Periostin蛋白与非瓣膜性心房颤动关系的研究较少。目的探讨血清转化生长因子β(TGF-β)、Periostin蛋白水平与非瓣膜性心房颤动的关系及其作用机制。方法将2018年3月—2019年3... 详细信息

背景Periostin蛋白是一种高度保守的功能蛋白,目前关于血清Periostin蛋白与非瓣膜性心房颤动关系的研究较少。目的探讨血清转化生长因子β(TGF-β)、Periostin蛋白水平与非瓣膜性心房颤动的关系及其作用机制。方法将2018年3月—2019年3月山西医科大学第二医院收治的非瓣膜性心房颤动患者61例作为试验组,另选取同期健康体检者27例为对照组。比较两组受试者性别、年龄、个人史(包括吸烟、饮酒)、既往史(包括高血压、糖尿病)、实验室检查指标〔总胆固醇(TC)、三酰甘油(TG)、高密度脂蛋白(HDL)、低密度脂蛋白(LDL)、TGF-β、Periostin蛋白〕及左心房内径;血清TGF-β、Periostin蛋白水平及左心房内径间的相关性采用Pearson相关性分析;非瓣膜性心房颤动影响因素分析采用多因素Logistic回归分析。结果试验组患者血清TGF-β、Periostin蛋白水平高于对照组,左心房内径大于对照组(P<0.05)。Pearson相关性分析结果显示,非瓣膜性心房颤动患者血清TGF-β水平与Periostin蛋白水平(r=0.366)、左心房内径(r=0.302)呈正相关(P<0.05),Periostin蛋白水平与左心房内径呈正相关(r=0.320,P<0.05)。多因素Logistic回归分析结果显示,血清TGF-β水平〔OR=1.001,95CI(1.000,1.002)〕、左心房内径〔OR=0.780,95%CI(0.682,0.891)〕是非瓣膜性心房颤动的独立影响因素(P<0.05)。结论非瓣膜性心房颤动患者血清TGF-β水平与Periostin蛋白水平呈正相关,且血清TGF-β水平是非瓣膜性心房颤动的独立影响因素,进一步推测TGF-β可能通过促进Periostin蛋白分泌而导致心肌纤维化,且二者还可能通过影响心房重构而引发非瓣膜性心房颤动。

关键词：心房颤动转化生长因子-β Periostin蛋白关系

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Hybrid CuO-Co_(3)O_(4)nanosphere/RGO sandwiched composites as anode materials for lithium-ion batteries

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Chinese Journal of Chemical Engineering 2022年第7期35卷 185-192页

作者： Yingmeng Zhang Luting Liu Qingwei Deng Wanlin Wu Yongliang Li Xiangzhong ren peixin Zhang Lingna Sun College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

Hybrid CuO-Co_(3)O_(4)nanosphere building blocks have been embedded between the layered nanosheets of reduced graphene oxides with a three dimensional(3D)hybrid architecture(CuO-Co_(3)O_(4)-RGO),which are successfully applied as enhanced anodes for lithium-ion batteries(LIBs).The CuO-Co_(3)O_(4)-RGO sandwiched nanostructures exhibit a reversible capacity of~847 mA·h·g^(-1)after 200 cycles’cycling at 100 mA·g^(-1)with a capacity retention of 79%.The CuO-Co_(3)O_(4)-RGO compounds show superior electrochemical properties than the comparative CuO-Co_(3)O_(4),Co_(3)O_(4)and CuO anodes,which may be ascribed to the following reasons:the hybridizing multicomponent can probably give the complementary advantages;the mutual benefit of uniformly distributing nanospheres across the layered RGO nanosheets can avoid the agglomeration of both the RGO nanosheets and the CuO-Co_(3)O_(4) nanospheres;the 3D storage structure as well as the graphene wrapped composite could enhance the electrical conductivity and reduce volume expansion effect associated with the discharge-charge process.

关键词： Composites Nanostructure Nanoparticles Reduced graphene oxide Metal oxides Lithium ion batteries

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Fe_(2)O_(3)-MWNTs Composite with Reinforced Concrete Structure as High-performance Anode Material for Lithium-ion Batteries

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Chemical Research in Chinese Universities 2023年第2期39卷 240-245页

作者： WANG Suhang ZUO Jinxin LI Yongliang ZHONG Yiming ren Xiangzhong ZHANG peixin SUN Lingna College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen518060P.R.China Babel International College PerthWA6100Australia

A Fe_(2)O_(3)-MWNTs(multi-walled carbon nanotubes)composite with a reinforced concrete structure was fabricated employing a two-step method which involves a sol-gel process followed by high-temperature in situ *** Fe_(2)O_(3)-MWNTs composite,intended to be used as an anode material for lithium-ion batteries,maintained a reversible capacity as high as 896.3 mA·h/g after 100 cycles at a current density of 100 mA/g and the initial coulombic efficiency reached 75.5%.The rate capabilities of the Fe_(2)O_(3)-MWNTs composite,evaluated using the ratios of capacity at 100,200,500,1000,2000 and 100 mA/g after every 10 cycles,were determined to be 904.7,852.1,759.0,653.8,566.8 and 866.3 mA·h/g,*** a superior electrochemical performance of the Fe_(2)O_(3)-MWNTs composite is mainly attributed to the reinforced concrete construction,in which the MWNTs function as the skeleton and conductive *** a structure contributes to shortening the transport pathways for both Li+and electrons,enhancing conductivity and accommodating volume expansion during prolonged *** Fe_(2)O_(3)-MWNTs composite with the designed structure is a promising anode material for high-performance lithium-ion batteries.

关键词： Lithium-ion battery Anode material Fe_(2)O_(3)-multi-walled carbon nanotubes(MWNTs)composite Sol-gel Reinforced concrete structure

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Accelerating lithium-sulfur battery reaction kinetics and inducing 3D deposition of Li_(2)S using interactions between Fe_(3)Se_(4)and lithium polysulfides

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Journal of Energy Chemistry 2024年第8期95卷 540-553,I0012页

作者： Yihan Lin Liheng Li Longjie Tan Yongliang Li Xiangzhong ren peixin Zhang Chuanxin He Lingna Sun College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina

Although lithium-sulfur batteries(LSBs)exhibit high theoretical energy density,their practical application is hindered by poor conductivity of the sulfur cathode,the shuttle effect,and the irreversible deposition of Li_(2)*** address these issues,a novel composite,using electrospinning technology,consisting of Fe_(3)Se_(4)and porous nitrogen-doped carbon nanofibers was designed for the interlayer of *** porous carbon nanofiber structure facilitates the transport of ions and electrons,while the Fe_(3)Se_(4)material adsorbs lithium polysulfides(LiPSs)and accelerates its catalytic conversion ***,the Fe_(3)Se_(4)material interacts with soluble LiPSs to generate a new polysulfide intermediate,Li_(x)FeS_(y)complex,which changes the electrochemical reaction pathway and facilitates the three-dimensional deposition of Li_(2)S,enhancing the reversibility of *** designed LSB demonstrates a high specific capacity of1529.6 mA h g^(-1)in the first cycle at 0.2 *** rate performance is also excellent,maintaining an ultra-high specific capacity of 779.7 mA h g^(-1)at a high rate of 8 *** investigation explores the mechanism of the interaction between the interlayer and LiPSs,and provides a new strategy to regulate the reaction kinetics and Li_(2)S deposition in LSBs.

关键词： Lithium-sulfur batteries Polysulfide intermediates Li_(2)S electrodeposition Interlayers Electrostatic spinning Adsorption Catalysis

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Pyrimidine donor induced built-in electric field between melon chains in crystalline carbon nitride to facilitate excitons dissociation

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Chinese Chemical Letters 2023年第3期34卷 546-552页

作者： Guoqiang Zhang Yangsen Xu Guoshuai Liu Yongliang Li Chuanxin He Xiangzhong ren peixin Zhang Hongwei Mi College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Guangdong Flexible Wearable Energy and Tools Engineering Technology Research Centre Shenzhen University Shenzhen 518060China Research Centre for Information Technology Shenzhen Institute of Information TechnologyShenzhen 518172China School of Environmental and Civil Engineering Jiangnan UniversityWuxi 214122China

The strong intrinsic Coulomb interactions of Frenkel excitons in crystalline carbon nitride(CCN) greatly limits their dissociation into electrons and holes, resulting in unsatisfactory charges separation and photocatalytic efficiency. Herein, we propose a strategy to facilitate excitons dissociation by molecular regulation induced built-in electric field(BIEF). The electron-rich pyrimidine-ring into CCN changes the charge density distribution over heptazine-rings to induce BIEF between melon chains. Such BIEF is sufficient to overcome the considerable exciton binding energy(EBE) and reduce it from 38.4 meV to 16.4 meV,increasing the excitons dissociation efficiency(EDE) from 21.5% to 51.9%. Our results establish a strategy to facilitate excitons dissociation through molecular regulation induced BIEF, targeting the intrinsic high EBE and low EDE of polymer photocatalysts.

关键词： Crystalline carbon nitride Exciton binding energy Built-in electric field Pyrimidine donor Excitons dissociation

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Regulation of hydrogen evolution performance of titanium oxide-carbon composites at high current density with a Ti-O hybrid orbital

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Carbon Energy 2022年第3期4卷 480-490页

作者： Meichen Liu Zhiping Lei Qingping Ke peixin Cui Jiancheng Wang Jingchong Yan Zhanku Li Hengfu Shui Shibiao ren Zhicai Wang Ying Kong Shigang Kang Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization Institute of Material Science&EngineeringSchool of Chemistry&Chemical EngineeringAnhui University of TechnologyMa'anshanChina Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceThe Chinese Academy of SciencesNanjingChina Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuanChina

Rational design and controllable synthesis of practical electrodes with high sta bility and activity at high current density for a hydrogen evolution reaction(HER)are critical for renewable and sustainable energy ***,high-performance TiO_(2)-based electrocatalysts for HER are quite limited,and the cat alytic active centers still remain ***,a simple strategy is demonstrated for the synthesis of TiO_(2)-carbon composite(TiO_(2)/C)with high HER performance and *** remarkable HER performance of TiO_(2)/C can be ascribed to the doping of carbon atoms,which leads to stronger hybridization of Ti 3d and O 2p orbitals,thus substantially improving the electrocatalytic *** study elucidates that the hydrogen evolution activity of oxide electrocatalysts can be largely improved by regulating their electronic structures by doping carbon atoms and also provides an effective strategy for designing heterostructured electro catalysts with high catalytic activity and stability at high current density for HER.

关键词： C doping HER high current density Ti-O hybridization TiO_(2)/C

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Quasi-solid-state polymer plastic crystal electrolyte for subzero lithium-ion batteries

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Journal of Energy Chemistry 2020年第7期29卷 87-93,I0003页

作者： Yumei Zhou Fengrui Zhang peixin He Yuhong Zhang Yiyang Sun Jingjing Xu Jianchen Hu Haiyang Zhang Xiaodong Wu i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123JiangsuChina Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Key Laboratory for the Synthesis and Application of Organic Functional MoleculesMinistry of EducationCollege of Chemistry and Chemical EngineeringHubei UniversityWuhan 430062HubeiChina National Engineering Laboratory for Modern Silk College of Textile and Clothing EngineeringResearch Center of Cooperative Innovation for Functional Organic/Polymer Material Micro/NanofabricationSoochow University199 Ren-Ai RoadSuzhou Industrial ParkSuzhou 215123JiangsuChina

Succinonitrile(SN)-based polymer plastic crystal electrolytes(PPCEs)have attracted considerable attention as solid-state electrolytes owing to their high ionic conductivities similar to those of liquid electrolytes,excellent contacts with the electrodes,and good mechanic *** a crucial property of a solid-state electrolyte,the ionic conductivity of the PPCE directly depends on the interactions between the constituent parts including the polymer,lithium salt,and SN.A few studies have focused on the effects of polymer–lithium–salt and polymer–SN interactions on the PPCE ionic ***,the impact of the lithium–salt–SN combination on the PPCE ionic conductivity has not been *** particular,tuning of the lithium-salt–SN interaction to fabricate a subzero PPCE with a high low-temperature ionic conductivity has not been *** this study,we design and fabricate five PPCE membranes with different weight ratios of Li N(SO2 CF3)2(Li TFSI)and SN to investigate the effect of the Li TFSI–SN interaction on the PPCE ionic *** ionic conductivities of the five PPCEs are investigated in the temperature range of–20 to 60°C by electro-chemical impedance *** interaction is analyzed by Fourier-transform infrared spectroscopy,Raman spectroscopy,and differential scanning *** Li TFSI–SN interaction significantly influences the melting point of the PPCE,dissociation of the Li TFSI salt,and thus the PPCE ionic *** tuning the Li TFSI–SN interaction,a subzero workable PPCE membrane having an excellent low-temperature ionic conductivity(6×10-4 S cm–1 at 0°C)is *** electro-chemical performance of the optimal PPCE is evaluated by using a Li Co O2/PPCE/Li4 Ti5 O12 cell,which confirms the application feasibility of the proposed quasisolid-state electrolyte in subzero workable lithium-ion batteries.

关键词： Succinonitrile Polymer plastic crystal electrolyte Ionic conductivity Lithium-salt–succinonitrile interaction Subzero lithium-ion battery

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