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Failure behavior of interfacial domain in SiC-matrix based composites

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Journal of Materials Science & Technology 2021年第29期88卷 1-10页

作者： jinxue ding Xiaokang Ma Xiaomeng Fan Jimei Xue Fang Ye Laifei Cheng Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi'an710072China

In this work,the microstructure,failure behavior and interfacial properties with respective to the interfacial domain in SiCf/BN/SiC and C_(f)/PyC/SiC composites were studied via the fiber push-in *** differences in the mechanical response of the interfacial domain were *** the fiber push-in test for SiCf/BN/SiC,the interface debonding accompanied with interphase fracture occurred,resulting in an obvious sign of the onset of debonding on loading-displacement(P-u)*** the good continuity of P-u curves can be observed for Cf/PyC/SiC,which is due to that the failure is in the form of interface debonding along with interphase lateral slipping caused by the extension of buckled carbon fiber,without any interphase *** interfacial properties calculated from the fiber push-in test show that Cf/PyC/SiC possesses a weaker interfacial domain compared with SiC_(f)/BN/*** interfacial shear stress of SiCf/BN/SiC and C_(f)/PyC/SiC composites amounts 94.2 and 48.1 MPa,respectively.

关键词： SiC-matrix based composites Interfacial domain Fiber push-in test Failure behavior Interfacial mechanical properties

Transportation Development Transition in China

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Chinese Geographical Science 2012年第3期22卷 319-333页

作者： JIN Fengjun ding jinxue WANG Jiao'e LIU Dong WANG Chengjin Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Transport Planning and Research Institute Ministry of Transport Beijing 100028 China

Scientific development is an invaluable asset to a *** and development modes should be carried out based on scientific findings not only in industry,but also in transportation infrastructure *** an integrated transportation system,which is in line with the national requirements of China and supports sustainable socio-economic development,is a key strategic issue related to building a moderately prosperous society and achieving realistic goals of a medium-level developed *** on a systematic review of the advances in China's transportation infrastructure over the last 60 years,this paper explores the main drivers of transportation development,including national policy,transportation structure,investment efficiency,and technological *** shows that China's comprehensive transportation infrastructure construction since 1949 can be divided into five stages initiated by these drivers,which correspond to four transition modes:policy transition,structural transition,efficiency transition,and technology *** transition path of China's transportation development shows that the dominant factors have changed,and the interval for each transition has *** the implementation of the '12th Five-Year Plan',China's transportation infrastructure construction is showing some new characteristics and facing a new development ***,this paper analyzes the trends in transportation development in China and concludes that technological innovation will be the main driving force to increase the transportation supply and service area in the future.

关键词： transportation infrastructure development transition integrated transportation system impact factor

Analysis of transportation carbon emissions and its potential for reduction in China

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Chinese Journal of Population,Resources and Environment 2013年第1期11卷 17-25页

作者： jinxue ding Fengjun Jin Yuejiao Li Jiao'e Wang Institute of Comprehensive Transportation of National Development and Reform Commission Institute of Geographic Sciences and Natural Resources Research CAS Graduate University of Chinese Academy of Sciences

The transportation industry is an essential sector for carbon emissions *** paper firstly used the LMDI(Logarithmic Mean Divisia Index)decomposition method to establish factors decomposition model on China's transportation carbon ***,a quantitative analysis was performed to study the factors influencing China's transportation carbon emissions from 1991 to 2008,which are identified as transportation energy efficiency,transportation structure and transportation *** results showed that:(1)The impact of transportation development on transportation carbon emissions showed pulling *** contribution value to carbon emissions remained at high growth since 1991 and showed an exponential growth trend.(2)The impact of transportation structure on transportation carbon emissions showed promoting function in general,but its role in promoting carbon emissions decreased year by *** with the continuous optimization of transportation structure,the promoting effect decreased gradually and showed the inversed"U"trend.(3)The impact of transportation energy efficiency on transportation carbon emissions showed a function of inhibition before *** order to predict the potential of carbon emission reduction,three scenarios were *** of the scenarios showed that if greater intensity emission reduction measures are taken,the carbon emissions will reduce by 31.01 million tons by 2015 and by 48.81 million tons by 2020.

关键词： transportation carbon emissions emission reduction potential factor decomposition

Evaluation and optimization of the spatial organization of the petrochemical industry in China

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Journal of Geographical Sciences 2013年第1期23卷 163-178页

作者： LIU He JIN Fengjun LIU Yi ding jinxue XU Xu Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences andNatural Resources Research CAS Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The spatial organization of the Chinese petrochemical industry was optimized according to the status of development of the industry employing linear programming and ArcGIS spatial analysis tools. We first identified the indexes of the spatial organization of the petrochemical industry and established a comprehensive evaluation index system that in- cludes four major categories and 11 indicators. The weight of each index was then deter- mined by the analytical hierarchy process. Afterward, taking the 337 Chinese prefecture-level administrations as basic units and scientifically evaluating the potential comprehensive layout coefficients of the cities, 151 prefecture-level administrative units were selected as the basis for the choice of optimization sites with a linear programming model. Secondly, using the 151 prefecture-level administrative units and the maximum-coverage model, the optimal number and spatial distribution of refineries were identified for service radii of 100, 200 and 300 km. Thirdly, considering the actual distribution of China＇s refineries, general rules for the number of refinery layout points and objective values were summarized, and 52 refinery layout points were selected for China. Finally, with ArcGIS spatial analysis tools, the spatial effect of the 52 optimal refinery layout points was simulated for the service scope and socioeconomic factors respectively, and the GDP and population data for each refinery layout point were then ex- tracted within the service scope. On this basis and with estimation of the intensity of crude-oil consumption, final results were obtained for the optimal spatial organization of the Chinese refining capacity and ethylene production capacity.

关键词： petrochemical industry spatial organization layout optimization maximum coverage model comprehensive layout coefficient spatial effect

交通强国建设下交通运输体制机制改革思路与建议

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经济纵横 2023年第8期 90-97页

作者：丁金学国家发展和改革委员会综合运输研究所北京100038

完善的交通运输体制机制是交通强国建设的根本保障。当前,虽然我国交通运输业已取得举世瞩目的成就,但与交通强国建设和中国式现代化建设的要求相比,仍然存在不少问题和发展差距,其背后的根本原因在于交通运输管理体制仍不完善,协调运... 详细信息

完善的交通运输体制机制是交通强国建设的根本保障。当前,虽然我国交通运输业已取得举世瞩目的成就,但与交通强国建设和中国式现代化建设的要求相比,仍然存在不少问题和发展差距,其背后的根本原因在于交通运输管理体制仍不完善,协调运行机制明显滞后。立足新发展阶段,急需转变思路,准确研判新时代我国交通运输体制机制改革的形势要求与重点方向,坚持政府和市场双轮驱动和双向发力,统筹重点领域管理体制深化改革与关键环节运行机制全面创新双措并举,持续渐进式深化与交通强国建设相适应的交通运输体制机制改革,为交通运输高质量发展、交通强国建设及全面支撑新发展格局构建提供坚实的制度保障。

关键词：交通强国交通运输体制机制改革

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新时代我国港产城融合发展问题、形势与建议

当代经济管理 2023年第12期45卷 74-80页

作者：丁金学国家发展和改革委员会综合运输研究所北京100038

港产城融合是港口城市发展的普遍规律,推动港产城融合发展既是优化港口、产业、城市布局的基本要求,也是提升城市发展能级的内在要求。基于我国港产城融合发展的现实基础和主要问题,分析新时代面临的发展形势,提出高质量融合的主要思路... 详细信息

港产城融合是港口城市发展的普遍规律,推动港产城融合发展既是优化港口、产业、城市布局的基本要求,也是提升城市发展能级的内在要求。基于我国港产城融合发展的现实基础和主要问题,分析新时代面临的发展形势,提出高质量融合的主要思路和发展路径。研究表明,随着港、产、城快速发展,港产城之间协同水平不高、空间布局不优、融合动能不足、体制机制不畅等突出问题逐步显现,现有融合发展格局难以适应高质量发展要求,需要科学把握新时代港产城融合发展新形势新要求,围绕构建现代化基础设施体系、现代化产业体系和新型城镇化体系,坚持港城共兴、产城交融、港产互促、空间统筹,实施以港兴城战略、产业立市战略、以港促产战略、空间重构战略等四大战略,分步推进、分类发力、分域施策,着力构圈铸链,加大创新引领,扎实推进新时代港产城高质量深度融合发展,开创具有中国特色的港产城融合发展道路。

关键词：新时代港产城融合发展港口经济临港产业

Cold sintering process:A green route to fabricate thermoelectrics

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Journal of Advanced Ceramics 2024年第11期13卷 1697-1712页

作者： jinxue ding Jing Guo Ruijuan Yan Wei Li Shuailing Ma Yanqin Fu Wenjie Xie Ralf Riedel Anke Weidenkaffa Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany State Key Laboratory for Mechanical Behavior of Materials&School of Materials Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Mechanical and Materials Engineering The University of Alabama at BirminghamBirmingham 35294USA Institute of High Pressure Physics School of Physical Scientific and TechnologyNingbo UniversityNingbo 315211China Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites Carbon Matrix Composites Research InstituteHenan Academy of SciencesZhengzhou 450046China Fraunhofer Research Institution for Materials Recycling and Resource Strategies IWKS Alzenau 63755Germany

Cold sintering is a newly developed low-temperature sintering technique that has attracted extensive attention in the fabrication of functional materials and *** sintering temperatures allow for a substantial reduction in energy consumption,and simple experimental equipment offers the possibility of large-scale *** cold sintering process(CSP)has been demonstrated to be a green and cost-effective route to fabricate thermoelectric(TE)materials where significant grain growth,secondary phase formation,and element volatilization,which are prone to occur during high-temperature sintering,can be well *** this review,the historical development,understanding,and application of thermoelectric materials produced via cold sintering are *** latest attempts related to the cold sintering process for thermoelectric materials and devices are discussed and *** some current technical challenges,cold sintering provides a promising and sustainable route for the design of advanced high-performance thermoelectrics.

关键词： cold sintering process(CSP) thermoelectrics(TEs) low-temperature sintering transport properties transient liquidphase

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中国高速公路规划网的空间效应与政策机制

地理学报 2011年第8期66卷 1076-1088页

作者：王成金丁金学杨威中国科学院地理科学与资源研究所区域可持续发展分析与模拟重点实验室北京100101 中国科学院研究生院北京100049

20世纪90年代中期以来,随着地方政府对高速公路的追求,高速公路规划和建设成为中国区域发展的突出问题。本文分析了中国高速公路网的规划规模与空间体系,重点对比集成网和国家网的规模总量和空间网络,结果表明中国高速公路网中长期目标... 详细信息

20世纪90年代中期以来,随着地方政府对高速公路的追求,高速公路规划和建设成为中国区域发展的突出问题。本文分析了中国高速公路网的规划规模与空间体系,重点对比集成网和国家网的规模总量和空间网络,结果表明中国高速公路网中长期目标达17.4万km,中西部省份的规模拓展明显;揭示了中国高速公路规划网引致的空间效应,包括连通性、空间服务水平和国土碎化,结论证明省级单位拓展后的集成网过于超前,新增路线主要连接人口和经济规模较小的城镇及偏远地区,覆盖效率低,偏离了中国经济发展、人口分布、城镇体系及地理环境的国情,高速公路规划规模与覆盖水平背离了其技术经济属性。然后,重点从政策角度分析了高速公路规划规模持续扩大的机制,认为高速公路规划审批体制、融资体制、收费政策、经济危机应对政策及政绩追求等是促使省级单位拓展规划规模的主要原因。

关键词：高速公路国家网集成网空间效应政策

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新时代我国综合交通运输发展形势与建议

重庆交通大学学报（社会科学版） 2024年第6期24卷 55-62,112页

作者：丁金学国家发展和改革委员会综合运输研究所北京100038

交通运输是中国式现代化的开路先锋,对全面建设社会主义现代化国家具有重要支撑引领功能。立足我国交通运输总体适应经济社会发展的现实基础,研判新时代交通运输发展形势和趋势演变,从绘“底图”、夯“底基”、强“底气”、筑“底蕴”... 详细信息

交通运输是中国式现代化的开路先锋,对全面建设社会主义现代化国家具有重要支撑引领功能。立足我国交通运输总体适应经济社会发展的现实基础,研判新时代交通运输发展形势和趋势演变,从绘“底图”、夯“底基”、强“底气”、筑“底蕴”、亮“底色”、描“底样”、塑“底魂”等七个方面提出新时代交通运输转型发展思路,系统梳理畅通道、织网络、强枢纽、优服务、提动能、增韧性等六大发展重点任务,提出城市群、都市圈、城市、农村以及特殊类型地区等重点地区特定区域精准补短板、强弱项的方向和重点。

关键词：新时代交通运输