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Phenology of different types of vegetation and their response to climate change in the Qilian Mountains,China

Journal of Mountain Science 2024年第2期21卷 511-525页

作者： zhao kaixin LI Xuemei ZHANG Zhengrong LIU Xinyu Faculty of Geomatics Lanzhou Jiaotong UniversityLanzhou 730070China National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring Lanzhou 730070China Gansu Provincial Engineering Laboratory for National Geographic State Monitoring Lanzhou 730070China

The Qilian Mountains(QM)possess a delicate vegetation ecosystem,amplifying the evident response of vegetation phenology to climate *** relationship between changes in vegetation growth and climate remains *** this end,we used MODIS NDVI data to extract the phenological parameters of the vegetation including meadow(MDW),grassland(GSD),and alpine vegetation(ALV))in the QM from 2002 to ***,we employed path analysis to reveal the direct and indirect impacts of seasonal climate change on vegetation ***,we decomposed the vegetation phenology in a time series using the trigonometric seasonality,Box-Cox transformation,ARMA errors,and Trend Seasonal components model(TBATS).The findings showed a distinct pattern in the vegetation phenology of the QM,characterized by a progressive shift towards an earlier start of the growing season(SOS),a delayed end of the growing season(EOS),and an extended length of the growing season(LOS).The growth cycle of MDW,GSD,and ALV in the QM species is clearly *** SOS for MDW and GSD occurred earlier,mainly between late April and August,while the SOS for ALVs occurred between mid-May and mid-August,a one-month delay compared to the other *** EOS in MDW and GSD were concentrated between late August and April and early September and early January,*** phenology exhibits distinct responses to seasonal temperature and precipitation *** advancement and delay of SOS were mainly influenced by the direct effect of spring temperatures and precipitation,which affected 19.59%and 22.17%of the study area,*** advancement and delay of EOS were mainly influenced by the direct effect of fall temperatures and precipitation,which affected 30.18%and 21.17%of the area,*** the contrary,the direct effects of temperature and precipitation in summer and winter on vegetation phenology seem less noticeable and were mainly influenced by indirect *** indirec

关键词： Vegetation phenology Time series decomposition Path Analysis Climate change

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A CMIP6-based assessment of regional climate change in the Chinese Tianshan Mountains

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Journal of Arid Land 2024年第2期16卷 195-219页

作者： LIU Xinyu LI Xuemei ZHANG Zhengrong zhao kaixin LI Lanhai Faculty of Geomatics Lanzhou Jiaotong UniversityLanzhou 730070China National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring Lanzhou 730070China Gansu Provincial Engineering Laboratory for National Geographic State Monitoring Lanzhou 730070China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Research Center for Ecology and Environment of Central Asia Chinese Academy of SciencesUrumqi 830011China

Climate warming profoundly affects hydrological changes,agricultural production,and human *** and semi-arid areas of China are currently displaying a marked trend of warming and *** Chinese Tianshan Mountains(CTM)have a high climate sensitivity,rendering the region particularly vulnerable to the effects of climate *** this study,we used monthly average temperature and monthly precipitation data from the CN05.1 gridded dataset(1961-2014)and 24 global climate models(GCMs)of the Coupled Model Intercomparison Project Phase 6(CMIP6)to assess the applicability of the CMIP6 GCMs in the CTM at the regional *** on this,we conducted a systematic review of the interannual trends,dry-wet transitions(based on the standardized precipitation index(SPI)),and spatial distribution patterns of climate change in the CTM during *** further projected future temperature and precipitation changes over three terms(near-term(2021-2040),mid-term(2041-2060),and long-term(2081-2100))relative to the historical period(1961-2014)under four shared socio-economic pathway(SSP)scenarios(i.e.,SSP1-2.6,SSP2-4.5,SSP3-7.0,and SSP5-8.5).It was found that the CTM had experienced significant warming and wetting from 1961 to 2014,and will also experience warming in the future(2021-2100).Substantial warming in 1997 was captured by both the CN05.1 derived from interpolating meteorological station data and the multi-model ensemble(MME)from the CMIP6 *** MME simulation results indicated an apparent wetting in 2008,which occurred later than the wetting observed from the CN05.1 in *** GCMs generally underestimated spring temperature and overestimated both winter temperature and spring precipitation in the *** and wetting are more rapid in the northern part of the *** the end of the 21st century,all the four SSP scenarios project warmer and wetter conditions in the CTM with multiple dry-wet ***,the rise in precipitation fails to counterbal

关键词： climate change Coupled Model Intercomparison Project Phase 6(CMIP6) global climate models(GCMs) shared socio-economic pathway(SSP)scenarios standardized precipitation index(SPI) Chinese Tianshan Mountains

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离子共掺对钛酸锶光催化性能的影响

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山东科技大学学报（自然科学版） 2024年第4期43卷 92-99页

作者：赵凯欣赵子豪王龙谈博文田秀娟山东科技大学材料科学与工程学院山东青岛266590

钛酸锶(SrTiO_(3))光催化剂是一种钙钛矿型氧化物,具有氧化还原能力强和环境友好的特点,在分解水制氢、有机污染物降解等领域得到广泛应用。通过水热法制备SrTiO_(3)光催化剂,并采用Pr/N共掺杂优化其能带结构。分析催化剂结构、形貌、... 详细信息

钛酸锶(SrTiO_(3))光催化剂是一种钙钛矿型氧化物,具有氧化还原能力强和环境友好的特点,在分解水制氢、有机污染物降解等领域得到广泛应用。通过水热法制备SrTiO_(3)光催化剂,并采用Pr/N共掺杂优化其能带结构。分析催化剂结构、形貌、比表面积和光催化析氢速率,以评估Pr/N共掺杂对SrTiO_(3)性能的影响。结果显示,与未掺杂的SrTiO_(3)相比,Pr/N-SrTiO_(3)的禁带宽度E g减小了0.3 eV;析氢速率为3.552 mmol·g^(-1)·h^(-1),提高62.3倍,且具有良好的循环稳定性。共掺杂离子Pr/N的存在延长了SrTiO_(3)的载流子寿命,提高了载流子的分离效率。

关键词：离子共掺 Pr/N-SrTiO_(3) SrTiO_(3) 光催化制氢

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基于GEE平台的黄河源区生态环境质量动态评价

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生态学杂志 2024年第1期43卷 290-298页

作者：赵开鑫李雪梅王桂钢孙旭伟兰州交通大学测绘与地理信息学院兰州730070 甘肃省地理国情监测工程实验室兰州730070 地理国情监测技术应用国家地方联合工程研究中心兰州730070 甘肃省生态环境科学设计研究院兰州730020 甘肃省黄河上游水源涵养区生态保护和修复工程研究中心兰州730020

黄河源区为我国生态脆弱区之一,近年来其生态环境问题备受关注。基于Google Earth Engine(GEE)平台并结合1990—2021年黄河源区Landsat遥感影像,本文综合6个指标(热度、干度、空气质量、绿度、湿度和叶面积指数)构建了遥感生态指数,对... 详细信息

黄河源区为我国生态脆弱区之一,近年来其生态环境问题备受关注。基于Google Earth Engine(GEE)平台并结合1990—2021年黄河源区Landsat遥感影像,本文综合6个指标(热度、干度、空气质量、绿度、湿度和叶面积指数)构建了遥感生态指数,对该区域生态环境质量动态进行了评价。结果表明:黄河源区热度、干度和空气质量指标对其生态环境质量呈负反馈作用;绿度、湿度和叶面积指数对生态环境质量呈正反馈作用,其中绿度为最关键的影响因素;黄河源区生态环境质量改善区占74.51%,总体呈“南优北劣”的空间格局,1990—2021年生态环境质量总体持续向好;1990—2021年,黄河源区89.75%的生态环境质量变化幅度较小,稳定性较好;Hurst指数分析表明,66.36%的黄河源区生态环境质量具有中强持续性,未来该区生态环境质量将会持续得到改善。

关键词：遥感生态指数 Google Earth Engine 黄河源区时空变化中强持续性

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低碳城市试点政策能否有效促进可再生能源技术创新?

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山东理工大学学报（社会科学版） 2024年第1期40卷 5-12页

作者：孙秀梅赵凯欣张慧山东理工大学管理学院山东淄博255000

低碳城市试点政策是中国促进经济社会绿色低碳发展的一项重要举措,而可再生能源技术创新是其中的关键技术路径。基于2006—2020年的城市数据,采用渐进双重差分法考察低碳试点城市对可再生能源技术创新发展的作用机制与影响差异。结果显... 详细信息

低碳城市试点政策是中国促进经济社会绿色低碳发展的一项重要举措,而可再生能源技术创新是其中的关键技术路径。基于2006—2020年的城市数据,采用渐进双重差分法考察低碳试点城市对可再生能源技术创新发展的作用机制与影响差异。结果显示,低碳城市试点政策主要通过影响城市产业结构和绿色金融发展促进可再生能源技术创新发展,且对不同资源禀赋城市的可再生能源技术创新具有异质性影响。研究建议持续扩大低碳城市试点政策推行范围,促进可再生能源技术创新发展,从而推动社会绿色转型。

关键词：低碳城市试点政策渐进双重差分模型可再生能源技术创新

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Enhancing Li cycling coulombic efficiency while mitigating “shuttle effect” of Li-S battery through sustained release of LiNO_(3)

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Journal of Energy Chemistry 2023年第9期84卷 22-29页

作者： Qi Jin kaixin zhao Lili Wu Lu Li Long Kong Xitian Zhang Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025HeilongjiangChina Frontiers Science Center for Flexible Electronics and Xi’an Institute of Flexible Electronics(IFE) Northwestern Polytechnical UniversityXi’an 710129ShaanxiChina

In practical lithium-sulfur batteries(LSBs),the shuttle effect and Li cycling coulombic efficiency(CE) are strongly affected by the physicochemical properties of solid electrolyte interphase(SEI).LiNO_(3) is widely used as an additive in electrolytes to build a high-quality SEI,but its self-sacrificial nature limits the ability to mitigate the shuttle effect and stabilize Li anode during long-term *** counteract LiNO_(3) consumption during long-term cycling without using a high initial concentration,inspired by sustainedrelease drugs,we encapsulated LiNO_(3) in lithiated Nafion polymer and added an electrolyte co-solvent(1,1,2,2-tetrafluoroethylene 2,2,2-trifluoromethyl ether) with poor LiNO_(3) solubility to construct highquality and durable F-and N-rich *** calculations,experiments,multiphysics simulations,and in-situ observations confirmed that the F-and N-rich SEI can modulate lithium deposition behavior and allow persistent repair of SEI during prolonged ***,the F-and N-rich SEI improves the Li anode cycling CE to 99.63% and alleviates the shuttle effect during long-term *** lithium anode with sustainable F-and N-rich SEI shows a stable Li plating/stripping over 2000 h at 1 mA cm^(-2).As expected,Li‖S full cells with this SEI achieved a long lifespan of 250 cycles,far exceeding cells with a routine *** Li‖S pouch cell based on F-and N-rich SEI also can achieve a high energy density of about300 Wh kg^(-1) at initial *** strategy provides a novel design for high-quality and durable SEls in LSBs and may also be extendable to other alkali metal batteries.

关键词： Lithium-sulfur battery Solid electrolyte interphase LiNO_(3) Coulombic efficiency Shuttle effect

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Tailoring the Spatial Distribution and Content of Inorganic Nitrides in Solid-Electrolyte Interphases for the Stable Li Anode in Li-S Batteries

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Energy & Environmental Materials 2022年第4期5卷 1180-1188页

作者： Qi Jin kaixin zhao Lu Li Xinzhi Ma Lili Wu Xitian Zhang Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China

Among the alternatives to lithium-ion batteries,lithium-sulfur(Li-S)batteries are considered as an attractive option because of their high theoretical energy density of 2570 Wh kg^(−1).However,the application of the Li-S battery has been plagued by the rapid failure of the Li anode due to the Li dendrite growth and severe parasitic reactions between Li and lithium *** physicochemical properties of the solid-electrolyte interphase have a profound impact on the performance of the Li ***,a lithium polyacrylic acid/lithium nitrate(LPL)-protective layer is developed to inhibit the dendrite Li growth and parasitic reactions by tailoring the spatial distribution and content of LiN_(x)O_(y) and Li_(3)N at the *** modified SEI is thoroughly investigated for compositions,ion transport properties,and Li plating/stripping ***,the Li-S cell with a high S loading cathode(5.0 mg cm^(−2)),LPL layer-protected thin Li anode(50μm),and 40μL electrolyte shows a long life span of 120 *** work evokes the avenue for regulating the spatial distribution of inorganic nitride at the SEI to suppress the formation of Li dendrites and parasitic reactions in Li-S batteries and perhaps guiding the design of analogous battery systems.

关键词： Li anode Li dendrites LiPAA/LiNO_(3)layer SEI shuttle effect

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Mitigating side reaction for high capacity retention in lithium-sulfur batteries

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Chinese Chemical Letters 2022年第1期33卷 457-461页

作者： Yong Cai Qi Jin kaixin zhao Xinzhi Ma Xitian Zhang Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China

Li-S batteries have shown great potential as secondary energy ***,the side reaction between Li anodes and polysulfides seriously limited their practical ***,the artificial protective film,which is consisted of Li-Nafion and TiO_(2),was designed and successfully prepared to achieve a corrosion-resistant Li anode in Li-S *** the composite protective film,the Li-Nafion could efficiently prevent the contact between Li anodes and polysulfides,and the incorporation of TiO_(2)nanoparticles into the Nafion could significantly increase the ionic conductivity and mechanical strength of the protective ***-Li symmetric cells with an optimal artificial protective film exhibited an extended cycle-life of 750 h at a current density of 1 mA/cm^(2)in Li_(2)S_(8)***,the Li-S full battery with an optimal protective Li anode exhibited higher capacity retention of 777.4 mAh/g after 100 cycles at 0.1 C as well as better rate performance than the cell with a pure Li *** work provides alternative insights to suppress the side reaction for Li-S batteries with high capacity retention.

关键词： Nafion/TiO_(2) Artificial protection film Li anode Side reaction Lithium-sulfur batteries

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联宗、商业与清中后期徽州墓祠的“再发明”——以婺源汪氏湖山墓祠为例

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安徽大学学报（哲学社会科学版） 2022年第4期46卷 1-8页

作者：赵凯欣北京大学历史学系北京100871

墓祠及墓祠祭祖是认识宗族制度的一个关键,学界一般认为其在明嘉靖年间随宗祠的普遍化而整体走向衰落,而婺源汪氏湖山墓祠的案例表明,大体于清中后期徽州出现了墓祠复兴的现象。汪氏湖山墓祠的形成既是婺源汪氏元明以来频繁联宗活动的承... 详细信息

墓祠及墓祠祭祖是认识宗族制度的一个关键,学界一般认为其在明嘉靖年间随宗祠的普遍化而整体走向衰落,而婺源汪氏湖山墓祠的案例表明,大体于清中后期徽州出现了墓祠复兴的现象。汪氏湖山墓祠的形成既是婺源汪氏元明以来频繁联宗活动的承续,也是清中后期新兴婺源商人宗派主动因应国家“联宗祠禁”、与族内其他商人宗派及仕宦宗派进行合作的结果。湖山墓祠实质上是一座新兴婺商主导的联宗祠,从祭祀仪式、参与方式、管理模式、运营原则等方面都体现出减少联宗成本、扩大联宗范围的意图。从湖山墓祠的案例可见,明清以来宗族制度的构造是持续的、因时因地制宜的,宗族在适应国家政治变化与区域社会经济发展的过程中,通过“传统的发明”实现了地方认同与国家象征的再结合。

关键词：徽州墓祠祠堂婺商联宗宗族徽商

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UltrahighQ Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

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Journal of Advanced Ceramics 2024年第2期13卷 155-165页

作者： Guoqiang He Yu Jiang kaixin Song Yanjun Liu Yuan Nie Wenjie Zhang Ziqi zhao Yinghan He Xinyue Ma Xiuli Chen Xu Li Huanfu Zhou Collaborative Innovation Centre for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of EducationSchool of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China College of Electronic Information Hangzhou Dianzi UniversityHangzhou 310018China

Microwave dielectric ceramics should be improved to advance mobile communication technologies *** this study,we prepared Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics with nonstoichiometric Sr^(2+)ratios based on our previously reported SrY_(2)O_(4) microwave dielectric ceramic,which has a low dielectric constant and an ultrahigh quality factor(Q value).The ceramic exhibited a 33.6% higher Q-by-frequency(Q×f)value(Q≈12,500)at x=0.02 than SrY_(2)O_(4).All Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics exhibited pure phase structures,although variations in crystal-plane spacings were *** ceramics are mainly composed of Sr-O,Y1-O,and Y_(2)-O octahedra,with the temperature coefficient of the resonant frequency(τ_(f))of the ceramic increasing with Y_(2)-O octahedral *** ceramic comprises uniform grains with a homogeneous elemental distribution,clear grain boundaries,and no obvious cavities at x=*** Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics exhibited good microwave dielectric properties,with optimal performance observed at x=0.02(dielectric constant(εr)=15.41,Q×f=112,375 GHz,and τ_(f)=-17.44 ppm/℃).The τ_(f) value was reduced to meet the temperaturestability requirements of 5G/6G communication systems by adding CaTiO_(3),with Sr_(1.02)Y_(2)O_(4.02)+2wt% CaTiO_(3) exhibiting ε_(r)=16.14,Q×f=51,004 GHz,andτf=0 ppm/℃.A dielectric resonator antenna prepared using Sr_(1.02)Y_(2)O_(4.02)+2wt%CaTiO_(3) exhibited a central frequency of 26.6 GHz,with a corresponding gain and efficiency of 3.66 dBi and 83.14%,***,Sr_(1.02)Y_(2)O_(4).02-based dielectric resonator antennas are suitable for use in 5G millimeter-wave band(24.5-27.5 GHz)applications.

关键词： millimeter wave microwave dielectric ceramics dielectric resonator antenna nonstoichiometric ratio

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