A Comprehensive Evaluation Framework of Water-Energy-Food System Coupling Coordination in the Yellow River Basin,China

For mankind’s survival and development,water,energy,and food(WEF)are essential material guarantees.In China,however,the spatial distribution of WEF is seriously unbalanced and mismatched.Here,a collaborative governance mechanism that aims at nexus security needs to be urgently established.In this paper,the Yellow River Basin in China with a representative WEF system,was selected as a case.Firstly,a comprehensive framework for WEF coupling coordination was constructed,and the relationship and mechanism between them were analyzed theoretically.Then,we investigated the spatiotemporal characteristics and driving mechanisms of the coupling coordination degree(CCD)with a composite evaluation method,coupling coordination degree model,spatial statistical analysis,and multiscale geographic weighted regression.Finally,policy implications were discussed to promote the coordinated development of the WEF system.The results showed that:1)WEF subsystems showed a significant imbalance of spatial pattern and diversity in temporal changes;2)the CCD for the WEF system varied little and remained at moderate coordination.Areas with moderate coordination have increased,while areas with superior coordination and mild disorder have decreased.In addition,the spatial clustering phenomenon of the CCD was significant and showed obvious characteristics of polarization;and 3)the action of each factor is self-differentiated and regionally variable.For different factors,GDP per capita was of particular importance,which contributed most to the regional development’s coupling coordination.For different regions,GDP per capita,average yearly precipitation,population density,and urbanization rate exhibited differences in geographical gradients in an east-west direction.The conclusion can provide references for regional resource allocation and sustainable development by enhancing WEF system utilization efficiency.

Spatial-temporal Evolution of the Urban-rural Coordination Relationship in Northeast China in 1990-2018

To comprehensively understand the law of urban-rural relationship and propose scientific measures of urban-rural coordinated development in Northeast China,this study uses the coupling coordination degree model and geographically and temporally weighted regression(GTWR)model to analyze the spatial-temporal patterns and the corresponding driving mechanisms of its urban-rural coordination since 1990.The results are as follows.First,the urban-rural coupling coordination degree in Northeast China was very low and improved slowly,but its stages of evolution is a good interpretation of the strategic arrangements of China's urbanization.Second,the urban-rural coupling coordination degree in Northeast China had spatial differences and was characterized by central polarization,converging on urban agglomeration,which was high in the south and low in the north.Moreover,the gap between the north and south weakened.Third,the spatial-temporal evolution of the urban-rural coordination relationship in Northeast China was influenced by pulling from the central cities,pushing from rural transformation,and government regulations.The influence intensity of the three mechanisms was weak,but the pulling from the central cities was stronger than that of the other two mechanisms.Furthermore,the spatial difference between the three mechanisms determines the spatial pattern and its evolution of the urban-rural coordination relationship in Northeast China.Fourth,to promote the development of urban-rural coordination in Northeast China,it is essential to advance urban-rural economic correlation,enhance the government^role in regulating and guiding,and adopt different policies for each region in Northeast China.

Insight into the Relationship Between Local Coordination of Isolated Pt Atoms and Chemical Reactivity

The supported isolated Pt atoms(Pt iso)and other rare metals have attracted intensive concern due to their maximized metal utilization efficiency,unique reactivity or selectivity,connection to organometallic catalysis and the potential for making well-defined active sites[1-3].As catalytic active sites,oxide-supported isolated Pt-group metal atoms are well known for their unique reactivity and efficient metal utilization[4-6].Even continuous efforts have been made,it is still challenging to characterize the intrinsic ca-talytic activity of these dispersed active sites on oxide supports at a level that relates local electronic and geometric structure to function,because of their atomic dispersion,heterogeneity in the local coordination,dynamic changes in local coordination under reactive environments and low loading of metal[7-9].

Inter-provincial pattern of the coupled and coordinated relationship between touristization and urbanization

The coordinated development between touristization and urbanization is the key to optimizing regional industrial structure and building a long-term dynamic mechanism for urbanization. Based on constructing the measurement index system of touristization and urbanization level, the evaluation model on the coupled and coordinated degree is used in this paper to measure the inter-provincial pattern of the coupled and coordinated relationship between touristization and urbanization in 31 provinces and autonomous regions in China. The results show that the coupled and coordinated relationship between touristization and urbanization is significantly different in different regions, which presents a gradient decline pattern of the highest in the east, the lower in the middle and the lowest in the west. In the future, measures should be taken to promote the coordinated development between touristization and urbanization in accordance with the regional differences and actual development needs.

Coordination of economic development and ecological environment in resource exhausted cities

This paper establishes the evaluation index system of ecological environment and economic development in resource exhausted cities, and calculates the level of economic development and ecological environment during the year 2005-2012 by using the entropy method. Furthermore, this study analyzes the coordination degree and coordinated development degree by using the coordination model. The results show that the coordination relationship of economic development and ecological environment continues to improve from 2005 to 2012 in most of these resource exhausted cities. By 2012, other resource depletion cities are in all kinds of hierarchical coordination except Yichun and Hegang. From the standpoint of coordination development degree, although most of these resource exhausted cities have been increased continuously but the level is also lower except in Tongling and Xinyu. Finally, this paper puts forward the corresponding countermeasures and suggestions according to the results of the analysis.

Exploration on the Characteristics and Important Relationships of Xi Jinping's New Concept of Coordinated Economic Development

During the 18 th CPC National Congress, Xi Jinping raised a series of economic development thoughts, namely the five new concepts of development; innovative, coordinated, green, open and shared development, and put forward a series of economic development thoughts including"people-centered"economic development. These are the new summations of the practice of socialism with Chinese characteristics, and the latest achievements in the theory of the political economics of socialism with Chinese characteristics."People-centered"is both the starting point and final purpose of coordinated economic development, an accurate mastery of social and economic development rules, and also the foundation and specific manifestation of coordinated development between people and society. People's subjectivity, coordinated inclusiveness and dialectics of development are the characteristics of coordinated economic development. Regional coordinated development, urbanrural coordinated development, industrial coordinated development, coordinated development of national defense and economic construction, supply and demand coordinated development, ecological coordinated development and interacted coordinated development of the global economy are the important relationships of coordinated economic development that we have to recognize and handle properly.

乡村旅游与农村人居环境的耦合协调关系及障碍因子诊断——以山西省为例

在构建乡村旅游与农村人居环境评价指标体系的基础上,运用层次分析法、耦合协调度模型等定量分析山西省11个地级市乡村旅游与农村人居环境的耦合协调关系,运用障碍度模型对其耦合协调关系的障碍因子进行诊断。结果表明:(1)各地级市乡村旅游水平、农村人居环境水平的区域差距较大,且二者之间存在明显的空间错位。(2)晋中、临汾和运城为中度耦合协调级乡村旅游领先型,晋城、长治和吕梁为中度耦合协调级同步型,太原和阳泉为中度耦合协调级乡村旅游滞后型,忻州和大同为勉强耦合协调级同步型,朔州为初级耦合协调级乡村旅游滞后型。(3)基础设施、公共服务、产业机构是限制山西省乡村旅游与农村人居环境耦合协调发展的关键障碍因子,且7个维度的障碍分布状况差异较大,各地级市的关键障碍因子并不一致。(4)山西省今后应加强基础设施建设、提升公共服务水平和优化乡村旅游供给,并结合各区域的耦合协调关系及障碍因子状况,采取合理措施推动乡村旅游与农村人居环境持续协调发展。

中国数字经济空间动态演进的区域现状

数字经济已成为引领我国经济一体化高质量发展的主要驱动力,立足于国家整体经济及区域经济稳步协调发展的战略。文章基于中国2013—2020年省级数据,运用主成分分析法对中国数字经济进行测度,并运用社会网络分析及核密度等方法对我国数字经济动态演化的空间关联及区域差异进行研究。研究发现:(1)2013—2020年我国数字经济发展整体网络密度稳步提升但依旧处于低水平。(2)中国各省份数字经济发展两极分化,东部与西北、东北等边缘地区存在“数字经济鸿沟”,加之整体关联水平低,分化严重,发达地区对边缘地区的辐射效应较低,差距可能愈发扩大。(3)将其划分为四个板块,发现存在“弱关联”板块,板块间溢出关系及关联度差异悬殊,进一步研究各省份数字经济发展的“中间人”作用,发现各省份承担角色更是“极化”严重。研究结果可为我国持续深化数字经济建设,推动经济协调、稳定、高质量发展提供参考。

石家庄市县域科技创新与经济发展耦合协调关系时空演变

选取石家庄市13个县域单元作为研究区域,构建科技创新能力和经济发展水平评价指标体系,计算评价指数,测算两者的耦合协调度,使用ArcGIS绘制空间分布图,深入剖析科技创新能力、经济发展水平以及两者耦合协调关系的时空演变特征。研究发现:全市县域科技创新能力和经济发展水平呈现较强的正相关性,且都在2010—2017年间提升速度较快,而在2019年之后提升速度呈减慢的趋势。2010—2021年经济发展水平指数均高于科技创新能力指数,但后者提升速度高于前者,表明石家庄市各县域科技创新能力滞后于经济发展水平,但科技创新能力的发展势头较好。2010年以来,全市县域耦合协调度呈现上升趋势,但耦合协调度与科技创新能力和经济发展水平的变化趋势相似,即2018年之前的提升速度要快于2018年之后。2021年,全市县域耦合协调度等级为“勉强协调发展”,协调发展水平较低,有待进一步提升。

移民安置区农地流转意愿影响因素及耦合协调关系研究——以贵州PQ水库为例

移民问题是水利水电项目中的关键问题,关系到社会稳定与乡村振兴。运用地理探测器,因子分析法和耦合协调度模型对水库移民农地转入意愿与安置区农户农地转出意愿影响因素及其耦合协调关系进行研究。研究结果表明:(1)安置点社区融入状况,转入农地的距离,种植业等技能培训,农地价值,家庭农业劳动力人数,非农就业机会对移民农地转入意愿起着主要影响作用;非农就业水平,对土地权益受损的担忧程度,是否有闲置土地,非农就业机会,对土地流转政策了解程度,土地流转收益预期对安置区农户农地转出意愿起着主要的影响作用。(2)各影响因子之间存在两两交互关系,其中任意两因子交互作用后因子解释力均明显增强。转入农地的距离与安置区融入情况的交互作用对移民农地转入意愿的影响力最大;农地细碎化程度,是否有闲置土地,非农就业机会这3个因子与对土地权益受损担忧程度的交互作用对安置区居民农地转出意愿的影响力最大,家庭人均耕地面积安置区居民农地转出意愿具有隐形作用。(3)移民农地转入意愿与安置区农户农地转出意愿存在强关联性,二者相互影响,相互促进,并处于农地转入意愿超前的基本协调阶段。

绿色转型:关系调适、基本样态及其发轫机制

经典环境社会学研究聚焦环境问题或环境衰退的学理解剖与理论阐释,呈现“环境衰退论”的叙事特征。为应对环境挑战,人类积极调整人与自然以及人与人之间的关系,推动社会的绿色转型,勾勒出资源消耗迈向资源善用、环境损害迈向生态修复、生态代谢断裂迈向生态循环以及失序发展迈向协调发展的基本轮廓。制度-政策势能、经济-技术变革和社会-文化浪潮构成绿色转型赖以发轫和发展的基本机制,其中,制度-政策势能在中国的绿色转型实践中扮演着关键性角色。当前,绿色转型虽然已不只是学术想象与学术倡导,但这种转型实践还处于趋势性状态,面临着不平衡性、不稳定性和不充分性的挑战。对此,环境社会学需要持续开展更为深入的学理研究。

区域协调、央地关系和基本权利的中央化

区域协调发展本质上是个中央和地方关系的议题,要促进“效率”和“公平”兼顾的区域协调发展,根本上有赖于建立合理的央地关系。改革开放以来,我国中央和地方关系的制度安排呈现出“效率优先、兼顾公平”的总体取向,在地区竞争模式下试图通过缩小地区增长差距来推动区域之间协调发展。当我国逐渐进入第三产业占主导、经济空间集聚程度不断提高的新阶段,区域协调发展战略面临着由“推动地区经济增长”向“居民基本公共服务均等化”的转型。根据事务属性合理划分中央和地方权限,推动“公民基本权利的中央化”,落实中央政府基本公共服务均等化供给的责任,是推动区域协调发展战略真正做到“公平”和“效率”兼顾的制度保障。

数字金融与区域经济发展的耦合协调性测度及其动态演进

以中国八大综合经济区为例,运用耦合协调度模型分析数字金融对区域经济发展的耦合协调关系,并基于Dagum基尼系数与Kernel核密度揭示数字金融与区域经济发展之间协调关系的地区差异及动态演进规律。结果表明:八大综合经济区的经济发展水平总体呈现稳定增长态势,具有“东高西低”阶梯形的异质性和阶段性特征;数字金融与区域经济发展之间协调发展水平逐年提升,八大综合经济区普遍由失调阶段跨入协调阶段;数字金融与区域经济发展之间协调关系存在明显的地区差异,沿海经济区的协调水平明显高于内陆经济区,但地区间协调程度的差距呈现逐渐缩小的演进态势。

福建省中职教育经费投入空间非均衡及与经济发展的协调关系

中等职业教育是国民教育体系和人力资源开发的重要环节,是经济高质量发展的重要基础。从县域尺度,运用Dagum基尼系数和Kernel密度估计等方法,分析福建省中等职业教育经费投入的空间非均衡性特征及与经济发展的协调关系。结果表明:福建省中等职业教育经费投入总体差距较大,呈现先扩大后缩小趋势,且9个地市的地区内差距波动较大。地区间差距及超变密度是中等职业教育经费投入空间差距的主要来源。核密度曲线由尖峰、多峰形态向宽峰、单峰形态演变,具有明显的右拖尾现象。中职教育经费投入与经济发展的协调性较差,以经济发展水平较强超前型和较强滞后型为主,且存在显著的区域差距。

过渡金属配合物催化烯烃配位聚合综合实验的设计——催化剂构效关系的典型案例

文章介绍了一个涉及合成化学多领域的综合实验,要求学生利用合成的有机配体制备相应的过渡金属配合物,并作为催化剂均相催化烯烃配位聚合,同时对所得聚合物性能进行测试。该实验串联了有机配体合成、金属配合物合成、高分子催化合成和高分子材料性能测试模块的内容,能让学生观察到烯烃配位聚合中的催化剂构效关系,有利于全面提高学生的学习兴趣、实验技能和独立思考能力。

新型城镇化、市场化改革与数字经济发展

随着中国正式迈入新发展阶段,高效推进新型城镇化建设,进一步加速数字经济发展,着力构建高水平现代化市场体系已然成为中国“十四五”时期乃至未来助力高质量发展的关键举措。基于中国30个省份2011-2020年的面板数据,综合运用面板向量自回归模型、耦合协调度模型、双重固定效应模型等方法客观揭示了新型城镇化、市场化改革与数字经济三大系统的互动关系、耦合协调发展程度及其有效驱动因素,得到以下研究结论:第一,新型城镇化能够显著推动地区市场化改革,市场化改革有利于促进数字经济发展;新型城镇化与数字经济则能够彼此支持、相互促进;第二,中国新型城镇化、市场化改革与数字经济的耦合协调程度稳步提升,三大系统间的互动联系愈发密切,协调发展态势已基本形成,但总体呈现由东向西的区域梯度差距分布;第三,固定资产投资、政府干预、科技创新等因素则是驱动三大系统耦合协调发展的关键。由此表明,创新完善宏观调控政策,科学引导,精准施策,统筹推动新型城镇化、市场化改革与数字经济的稳健发展,合理实现三者间的高水平联动,将是当代中国实现经济转型与高质量发展的题中应有之义。

珠三角城市群人口-产业-环境耦合协调度及其影响因素

利用人口、产业和环境三大维度相关的多源大数据,构建耦合协调度测度模型。以珠三角城市群为例,测定人口-产业-环境维度的耦合协调度,并结合相关分析与地理加权回归模型分析其影响因素。结果表明:珠三角城市群人口-产业-环境协调度普遍较低,呈现明显的高值与低值聚集的空间分布格局。城市群内各地级市与不同城乡地域类型的耦合协调度整体差异不大。耦合协调度主要受产业维度产业链串联共生度与环境维度植被净初级生产力的影响。人口与产业维度因子间相关性强且呈正相关,但二者与环境维度因子呈负相关关系。结合研究结果,提出夯实南沙与珠三角西岸地区以创新引领的高质量发展、加强珠三角城市群生态保护的可持续经济发展等建议。

考虑路径关系的干线多路径绿波优化模型

针对协调路径数目增加后绿波带宽变窄问题,本文提出一种考虑路径关系的多路径协调控制优化模型。分析路径的相关关系,构建上下行分区和路径分解模型;引入子区划分参数,改进经典多路径模型,构建子区内部协调约束;分析路径在相邻子区之间的衔接特征,构建子区间连接性约束条件;综合考虑子路径长度和流量构建权重系数,以各子路径绿波带宽加权和最大为优化目标,建立多路径协调控制优化模型。为验证模型的有效性,选取南京市典型干道为研究对象开展案例分析。实验结果表明,本文提出的模型可以有效增大绿波带宽,相较于对比模型,加权绿波带宽和提高49.44%。利用VISSIM验证了方案的应用效果,仿真结果表明,本文模型方案可以获得更高的通行效益。相较于对比方案,关键路径车均延误和车均停车次数明显降低,干道车均延误和车均停车次数分别降低了20%和27%,车辆平均速度提高了17%。本文模型可为城市道路干线协调控制提供理论基础。

环鄱阳湖城市群土地利用功能转型及其驱动机制

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我国户外运动产业高质量发展动力机制与推进路径——基于人地关系协调视角

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