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Ecological Economy 2024年第2期20卷 123-138页

作者： XING Huai-zhen YAO Jing College of Economics and Management Nanjing Agricultural UniversityNanjing 210095CHINA Higher Education Research Institute Nanjing University of Information Science and TechnologyNanjing 210044CHINA

Utilizing provincial panel data from 2014 to 2020,this study employs a fixed effect model,a threshold effect model,and a spatial lag model to empirically examine the correlation between digital economic development and carbon *** findings indicate that digital economic development significantly contributes to the enhancement of carbon productivity in the long ***,through instrumental variable method,replacement of explanatory variables and other methods to test its endogeneity and stability,the results remain *** terms of regional heterogeneity,the impact of digital economic development on carbon productivity is less pronounced in the central and western regions compared to the eastern ***,further investigation reveals that industrial structure upgrading and science and technology investment level exhibit different threshold effects on the influence of digital economy development level on carbon ***,there is a significant spatial spillover effect of digital economy development on carbon productivity with H-H and L-L agglomeration spatial correlation.

关键词： digital economy carbon productivity threshold effect spatial spillover effect

Research on the Impact of China’s Foreign Trade Technology Spillover on Green Total Factor Productivity of Countries Along the“Belt and Road”:Based on the Institutional Quality threshold effect

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Proceedings of Business and Economic Studies 2024年第2期7卷 120-125页

作者： Li Chai Longnan Ma Lingwei Meng Xinjiang University of Finance and Economics Urumqi 830012China Capital University of Economics and Business Beijing 100070China

China’s growing trade with countries along the“Belt and Road”Initiative is accompanied by a focus on green *** on the panel data from 2007 to 2018,this paper establishes a threshold regression model to empirically analyze the institutional quality threshold effect of China’s foreign trade technology spillover on the GTFP of countries along the“Belt and Road.”The results show that China’s foreign trade technology spillover has a significant institutional quality double threshold effect on the green total factor productivity of the countries along the“Belt and Road.”As the institutional quality of the countries along the“Belt and Road”crosses a specific threshold value,the impact of China’s foreign trade technology spillover on the green total factor productivity of the countries along the“Belt and Road”has a significant positive promoting effect,and corresponding suggestions are put forward.

关键词： Technology spillover Green total factor productivity Institutional quality threshold effect

Research on the threshold effect of China’s Pharmaceutical Export Trade on Internal and External R&D Investment

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Asian Journal of Social Pharmacy 2024年第2期19卷 135-146页

作者： Qiao Jiahui Song Yu Gong Jingran Chen Yuwen School of Business Administration Shenyang Pharmaceutical UniversityShenyang 110016China Research Institute of Drug Regulatory Science Shenyang Pharmaceutical UniversityShenyang 110016China

Objective To study the threshold effect of export trade on internal and external R&D investment in China’s pharmaceutical industry,and to provide reference for some pharmaceutical enterprises to improve the *** The panel data of pharmaceutical industry in 25 provinces and cities in China from 2009 to 2019 were selected to conduct empirical analysis by establishing a threshold regression model,and a better export trade interval was *** and Conclusion There is a threshold value for the effect of new product export on both internal and external R&D expenditures,and the threshold values are 845.2788 million yuan and 318.4198 million yuan,*** is a single threshold effect of export trade on both internal and external R&D investment in China’s pharmaceutical industry,and the effect of export trade on internal and external R&D investment changes from negative to positive as the export trade develops from low to high.

关键词： pharmaceutical industry threshold effect export trade R&D investment

Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes

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Fundamental Research 2023年第6期3卷 868-879页

作者： Guangliang Zhang Junhong Bai Jia Jia Wei Wang Dawei Wang Qingqing Zhao Chen Wang Guozhu Chen State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Advanced Institute of Natural Sciences Beijing Normal UniversityZhuhai 519087China Henan Key Laboratory of Ecological Environment Protection and Restoration of Yellow River Basin Yellow River Institute of Hydraulic ResearchZhengzhou 450003China Shandong Provincial Key Laboratory of Applied Microbiology Ecology InstituteQilu University of Technology(Shandong Academy of Sciences)Ji'nan 250103China

Salinity stress is one of the critical environmental drivers of soil organic matter(SOM)decomposition in coastal *** the temperature sensitivity(Q_(10))of SOM decomposition has been widely applied in Earth system models to forecast carbon processes,the impact of salinity on SOM decomposition by restructuring microbial communities remains ***,we conducted a microcosm experiment with soils collected from the coastal salt marsh in the Yellow River Estuary,which is subjected to strong dynamics of salinity due to both tidal flooding and *** setting a gradient of salt solutions,soil salinity was adjusted to simulate salinity stress and soil carbon emission(CO_(2))rate was measured over the *** showed that as salinity increased,the estimated decomposition constants based on first-order kinetics gradually decreased at different *** the 20‰salinity treatments,which doubled the soil salinity,Q_(10)increased with increasing salinity;but higher salinity constrained the temperature-related response of SOM decomposition by inhibiting microbial growth and carbon *** bacteria were more sensitive to salinity stress than fungi,which can be inferred from the response of microbial beta-diversity to changing *** them,the phylotypes assigned to Gammaproteobacteria and Bacilli showed higher salt tolerance,whereas taxa affiliated with Alphaproteobacteria and Bacteroidota were more easily inhibited by the salinity *** fungal taxa belonging to Ascomycota had higher adaptability to the *** the substrate was consumed with the incubation,bacterial competition intensified,but the fungal co-occurrence pattern changed weakly during ***,these findings revealed the threshold effect of salinity on SOM decomposition in coastal salt marshes and emphasized that salt stress plays a key role in carbon sequestration by regulating microbial keystone taxa,metabolisms,and interactions.

关键词： Salt marshes Salinity stress Soil organic matter decomposition Temperature sensitivity threshold effect Microbial community

Manufacturing Demand and Producer Services Efficiency in China:threshold effect of Economic Development

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China Finance and Economic Review 2018年第4期7卷 48-70页

作者： Wen Wang Zao Sun School of Economics and Finance of Xi’an Jiaotong University

Considering the important role the demand from manufacturing has played in the development of producer services,this paper analyzes the influence mechanism of manufacturing demand on producer services efficiency through two channels,which are the scale effect and innovation ***,the paper also evaluates the moderating effect of economic development level on the relationship between manufacturing demand and producer services *** on the panel data of China’s manufacturing industry and producer services from 1995 to 2014,the empirical result shows that:(1)the demand from manufacturing was helpful to improve producer services efficiency,and compared with the labor-intensive manufacturing,the demand from capital-intensive manufacturing played a more important role in improving producer services efficiency;(2)at different stages of economic development,the promoting effect of manufacturing demand on producer services efficiency showed a nonlinear threshold effect rather than a simple linear effect,namely after crossing a certain threshold of economic development level,the promoting effect would be more *** specifically the threshold level faced by capital-intensive manufacturing industry was higher than that faced by labor-intensive manufacturing *** findings may be helpful for governments to make industrial development strategy.

关键词： manufacturing demand producer services efficiency economic development level threshold effect

Impact of coupling coordination development of port and city environments on urban economic competitiveness:Evidence from the coastal port cities in eastern China

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Ecological Economy 2024年第1期20卷 53-71页

作者： LI Zhen-qiang YI Ying LI Jia-li YOU Xiao-yue ZHOU Qiu-yang School of Economics and Management Hunan Institute of Science and TechnologyYueyang 414006CHINA School of Urban and Regional Science Shanghai University of Finance and EconomicsShanghai 200433CHINA

Promoting the coupling coordination development of port and its hinterland city environments is an important way to improve urban economic *** on relevant data of 13 coastal port cities in eastern China from 2000 to 2018,this study explores the coupling coordination development of port and city environments and its impact on urban economic competitiveness by constructing the coupling coordination degree model and the panel threshold *** research results show that:(1)In terms of the coupling coordination development of port and city environments,most coastal ports and their hinterland cities are in a state of moderate or serious ***,the degree of coupling coordination of port and city environments needs to be further improved;(2)The coupling coordination degree of port and city environments has a significant impact on urban economic competitiveness,and this effect gradually increases with the development of the ports and the urban *** the variables that impact the urban economic competitiveness,fixed assets investment and foreign trade are significant factors that can enhance urban economic competitiveness.(3)At present,there is a“U-shaped”relationship between the coupling coordination degree of port-city environments and the urban economic *** relationship lies on the right side of the inflection point of the“U-shaped”***,following the concept of assigning priority to ecological development,expanding fixed assets investment and actively developing foreign trade can further enhance the urban economic competitiveness.

关键词： coastal ports city environments coupling coordination degree urban economic competitiveness threshold effect

互联网使用对低龄留守儿童自我管理能力影响的门槛效应研究

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从表征到介入：社会-生态韧性的临界识别问题探究

心理学 2024年第5期

作者：雷万鹏尹珺瑶

基于湖北省8县(区)3791名小学生调查，从互联网使用条件、使用偏好和使用时长等维度探讨了互联网使用对低龄留守儿童自我管理能力的影响。研究发现，互联网使用条件对低龄留守儿童自我管理能力没有显著影响，互联网使用偏好和时长对低... 详细信息

基于湖北省8县(区)3791名小学生调查，从互联网使用条件、使用偏好和使用时长等维度探讨了互联网使用对低龄留守儿童自我管理能力的影响。研究发现，互联网使用条件对低龄留守儿童自我管理能力没有显著影响，互联网使用偏好和时长对低龄留守儿童自我管理能力有显著影响，儿童上网学习时长对儿童自我管理能力有显著的门槛效应。因此，应合理引导低龄儿童互联网使用偏好，规范互联网使用时间和上网学习时间以增进留守儿童信息素养；全方位关心支持低龄留守儿童身心健康发展，减少其网络依赖，提升低龄留守儿童自我管理能力。

关键词：自我管理能力互联网使用低龄留守儿童门槛效应 self-management ability Internet use low-age left-behind children threshold effect

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科学技术哲学 2024年第5期

作者：刘益宇廖成东

临界识别问题是当前社会-生态韧性研究的前沿难题之一。该难题源于社会-生态系统的复杂系统演化特征、社会-生态韧性的整体性以及真实性表征的双重困难。基于系统相对稳定状态和边界假设的临界识别传统路径包括阈值或断裂点法等表征方... 详细信息

临界识别问题是当前社会-生态韧性研究的前沿难题之一。该难题源于社会-生态系统的复杂系统演化特征、社会-生态韧性的整体性以及真实性表征的双重困难。基于系统相对稳定状态和边界假设的临界识别传统路径包括阈值或断裂点法等表征方法，所面临的表征困境在于无法应对具有建构性特征的人类活动系统的挑战。解决这种困境的可能路径之一在于条件依赖的介入路径，尤其是依赖局域性整体条件的非操控型介入对于临界识别问题具有新启示，并且探究条件约束下重构场景识别的关键概念工具。

关键词：社会-生态系统韧性介入条件依赖临界识别 Social-ecological system Resilience Intervention Condition-depend threshold effect

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农业保险能否助力农业绿色发展水平提升?

Probing the internal structure of baryons

农业经济研究 2024年第4期

作者：焦雨欣江生忠费清

在“十四五”规划、“双碳”目标和ESG理念兴起的背景下，农业绿色发展已成为农业发展的重要议题和必由之路，本文旨在研究农业保险对农业绿色发展水平的影响。文章基于2010-2020年中国粮食主产区13个省份的面板数据搭建农业绿色发展水... 详细信息

在“十四五”规划、“双碳”目标和ESG理念兴起的背景下，农业绿色发展已成为农业发展的重要议题和必由之路，本文旨在研究农业保险对农业绿色发展水平的影响。文章基于2010-2020年中国粮食主产区13个省份的面板数据搭建农业绿色发展水平评价指标体系，使用熵权TOPSIS综合评价法测度各省当年农业绿色发展水平指数，在此基础上运用静态面板模型GMM估计方法实证分析农业保险对农业绿色发展水平的影响。研究结果表明：目前农业保险通过对产出高效发展水平、产品安全发展水平的负向影响和对环境友好发展水平的正向影响，间接产生了对粮食主产区省份的农业绿色发展水平的消极影响，且影响存在显著的门槛效应，随着农业保险赔付支出的增加，农业保险对农业绿色发展水平的负向影响程度呈现“倒U形”。本文认为应通过保险条款化学品减量投入要求纳入、绿色农业生产行为费率优惠等措施提升农业保险“绿色”属性，改变农业保险无法有效发挥其绿色转型支持作用的现状，实现农业保险对农业绿色发展水平提升的促进作用。

关键词：农业保险农业绿色发展水平熵权TOPSIS 门槛效应 agricultural insurance level of green agricultural development entropy weight TOPSIS threshold effect

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National Science Review 2021年第11期8卷 54-61页

作者： Guangshun Huang Rinaldo Baldini Ferroli BESⅢ Collaboration Department of Modern Physics University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics INFN Laboratori Nazionali di Frascati Institute of High Energy Physics Chinese Academy of Sciences

Electromagnetic form factors are fundamental observables that describe the electric and magnetic structure of hadrons and provide keys to understand the strong interaction. At the Beijing Spectrometer(BESⅢ),form factors have been measured for different baryons in the time-like region for the first time or with the best precision. The results are presented with examples focused on but not limited to the proton/neutron,the, with a strange quark, and the c, with a charm quark.

关键词： baryon structure form factor threshold effect abnormal production