Do companies influenced by smart cities pay more attention to green governance?Mechanism and optimal spatial correlation

Smart cities are a way for China to construct an innovative and environmentally conscious nation.The paper examines the impact of smart cities on corporate green governance and provides a theoretical foundation for formulating and executing smart city policy in China.Based on panel data from Chinese A-share listed companies in Shanghai and Shenzhen from 2008 to 2020,this study constructs a multiperiod double-difference model to examine the influence of smart cities on corporate green governance.Additionally,it uses a spatial double-difference model to investigate the spatial spillover effect of smart cities on neighboring areas.The findings indicate that smart cities effectively enhance corporate green governance.Analyzing the influencing mechanisms reveals that resource allocation efficiency,technological innovation,management environmental awareness,and regional environmental enforcement efforts act as mediators.Furthermore,the study reveals that the impact of smart cities on promoting corporate green governance is more pronounced in regions with lower levels of marketization and resource-based cities.Moreover,the research explores the spatial spillover effects of smart cities,with an effective radius of approximately 350 km.The optimal spatial correlation zone for green governance of businesses in neighboring areas in relation to smart cities is within a range of 250-350 km.This is manifested by the significant promotion of green governance in neighboring area businesses facilitated by smart cities.

Measurement and Strategy Research on the Green Development Level for the New Energy Vehicle Industry in Chongqing City

This article takes 2016-2022 as the inspection period to construct an evaluation index system for the green development level of the new energy vehicle industry.The entropy method and comprehensive index are used to measure the green development level of the new energy vehicle industry in Chongqing,and compared with neighboring provinces such as Yunnan,Guizhou,and Sichuan.Policy recommendations are proposed to promote the development of the new energy vehicle industry in Chongqing City.

Importance of Urban Wetland Parks under the Development of Green Healthy Cities:A Case Study of Nanjing City

Wetlands are widely distributed all over the world,and have many wildlife resources,which are the main pieces of the puzzle for natural resource conservation and sustainable development on earth and have important irreplaceability.In this paper,through questionnaire survey,field research,literature review,etc.,importance weight analysis was conducted by using principal component analysis,and field survey and questionnaire were carried out to collect data on ecological environment function,environmental protection function,landscape beautification function,disaster prevention and mitigation function of urban wetlands.The problems in wetland parks of Nanjing were discussed,such as lack of awareness of landscape planning,deficient late management of wetland parks,weak ability of sustainable development,and unreasonable landscape layout and function.Finally,corresponding solutions were proposed,such as adhering to the planning and design of urban wetland parks with green as the base and health as the basis,persisting in the construction of a wetland system with high biodiversity and near-natural characteristics,adhering to the principle of sustainable development,adopting the construction idea of symbiosis and circulation of urban wetland parks,strengthening education and publicity work,and paying attention to the organic combination of system protection and coordinated construction.The research can build a new development direction for the model of urban wetland parks and green healthy cities,and provide theoretical support for urban sustainable construction.

Influence of Urban Street Greening Design under the Concept of Green Healthy Cities:A Case Study of Hefei City

In order to explore the influence of urban street greening,the street landscape of Changjiang West Road and Xiyou Road in Hefei City was selected as the research sample to study the design of urban street landscape under the concept of green healthy cities.The results show that the urban street landscape of Hefei City is single in design and plant type,and plant maintenance management is not good.It is proposed to strengthen the maintenance and management of street greening,increase the types of native plants,and improve cultural connotation,so as to enhance the artistry,regionalism and functionality of urban street landscape in Hefei City.

应用CITY green模型评价西安文教区绿地生态效益

基于西安高分辨率遥感影像,使用ARCVIEW软件和CITY green模型,定量评价西安文教区绿地生态效益及服务价值量,并进行了科学预测分析。结果表明:2016年碳密度为3.009t/hm^2,年清除大气污染物为1.21t/a,单位面积暴雨径流削减量是71.076m3/hm^2,2026年、2036年、2046年、2056年、2066年的固碳与清除大气污染物的生态总量分别为203.89t、224.49t、234.51t、237.53t、239.49t;2016年、2026年、2036年、2046年、2056年、2066年的生态效益价值依次为19.38万元、29.25万元、32.11万元、33.66万元、34.17万元、34.51万元。反应出绿地固碳效益的优势、潜力,绿地系统在整个城市生态系统中的重要性,城市绿地具有显著的生态服务价值。研究结果能够指导森林城市的规划和建设。

Does innovative city pilot policy promote urban green growth in China?An analysis of green total factor productivity,2005-2020

The innovative city pilot policy(ICPP)is an essential manifestation of China’s construction of an innovative and green-driven development country.We incorporated urban green total factor productivity(GTFP)growth into the evaluation of ICPP.Based on the panel data of 223 cities in China from 2005 to 2020,we used the difference-in-differences model to empirically assess the influence and mechanism of the ICPP on urban GTFP growth.The main results show that(i)The ICPP has maintained an effectively fluctuating promotion on urban GTFP growth,mainly manifested in the urban green technological progress improvement.(ii)The ICPP has urban heterogeneity in promoting GTFP growth in pilot cities,mainly affecting key cities such as provincial capitals.(iii)The interaction between the agglomeration of producer services and the ICPP inhibits GTFP growth in pilot cities.

Hallmark of a Resilient City: Adoption of Green Infrastructure in African Cities

Dynamic urbanization of African cities has created development trajectories that face systemic challenges in the provision of sustainable and ecologically resilient urban environments. The specific challenges include extensive unregulated growth with informal settlements reflecting poor service levels and high poverty indices, inadequacy in provision of basic services in health, water, housing, transport and communication infrastructure, high reliance on biomass fuels, exposure to environmental stress and implausible climate change coping and mitigation mechanisms among others. Review of extensive literature and synthesis of existing bodies of knowledge on the ecological and management perspectives of urban environments revealed many gaps and understanding of urban transformation processes. The purpose of this review was to contextualize credible pathways for optimization of both ecosystem goods and services from green urban landscapes (Green infrastructure) and non-green infrastructure to ensure sustainable and ecologically resilient urban environments. Attempts were made to rationalize and validate through discussions the benefits of managed urban ecosystems for African cities. On the basis of the evidence from the literature, it is concluded that urban development trajectories that do not embrace multifaceted approaches that deliberately retain and maintain green infrastructure in the urban environment may not be cost-effective. It is recommended that systematic integration of urban forestry concepts in urban planning that involves communities, local and national governments, business entrepreneurs and public and private research institutions provides tenable frameworks for addressing current and future challenges of urbanization in Africa.

基于SBM模型和Tobit模型的资源型城市绿色发展效率与影响因素研究:以陕西省为例

资源型城市的发展强烈依赖于其丰富的自然资源和资源产业的发展,面临着资源消耗大、污染严重、发展动能和竞争力弱等问题,需要通过绿色转型发展实现高质量发展。本文选取陕西省作为资源型城市绿色发展研究的典型,根据陕西省资源型城市2012—2021年面板数据,利用包含非期望变量的超效率SBM模型测度了陕西省资源型城市的绿色转型发展效率,并选用Tobit模型分析了经济发展水平、产业结构、外资利用、工业固废利用水平、进出口贸易度、城镇化水平等因素对绿色转型发展效率的影响,得到以下结论:陕西省资源型城市的绿色发展效率整体上得到显著提升,其中陕北地区更为显著;经济发展水平、城镇化水平均正向影响各资源型城市的绿色发展效率,而产业结构、外资利用、工业固废利用水平、进出口贸易度等因素的影响可以为正向或负向;工业固废利用水平仅对陕北地区资源型城市、成熟型资源型城市的绿色发展效率产生正向影响作用。根据研究结论,可以从产业转型升级、提高对外绿色合作和城镇化水平、加强公共服务建设等方面促进资源型城市绿色发展效率的提升。

Development of the Greening of Industrial Firms in the Cities along Taihu Lake:A Case Study in Wuxi City,Jiangsu Province

Under the globalization, the coastal China becomes a hot area of the international manufacturing investment due to its priority location, excellent environment, lower labor and land costs, etc. However, the fast industrialization has aroused the great demolishment to the local ecological environment. For example, the heavy water eutrophication in Taihu Lake has affected the source of drinking water for the cities around the lake. Anyway, in order to keep the economic increase and reduce the resource ex- pense and pollution at the same time, it is necessary to encourage the greening of industrial enterprises actively for sustainable de- velopment. On the basis of the investigation of industrial enter- prises in Wuxi city within Taihu Basin, the relatively developed region in coastal China, this paper analyzed the development process of green industry. This article concluded that governmen- tal principal is the main pressure for enterprises to protect envi- ronment while the market factor plays a part role. Moreover, en- terprises in the high technology development zone work better in environmental protection than those in the villages and towns, while the large enterprises work better than those small enterprises.

和美乡村视角下的苏南农田“GREEN”水环境治理模式应用研究

随着中国宜居宜业和美乡村建设的不断深入,乡村水环境的治理与保护作为乡村生态文明建设的重要组成部分日益受到社会的重视和关注。在以往大规模灰色基础设施建设的背景下,乡村忽略了对于水生态绿色基础设施的构建,生态格局趋于破碎。农田空间作为农业面源污染的重要源头,结合多学科视角探索农田水环境污染治理新模式具有高度的必要性。立足于苏南地区独特的农田水网体系,紧密结合农业空间生产属性,研究现有农田水环境治理理论方法与实际建设,提炼以“源头绿色—过程净化—末端吸收—生态保育—循环回用”的苏南农田“GREEN”水环境治理模式,探索风景园林学科水治理方法在农田沟渠、河道及湿地等乡村空间的运用路径,并以常州市中天黄金大农场总体规划为例进行实践应用。推动风景园林学科于乡村生产空间的应用模式探索,为未来农业面源污染防治提供参考借鉴。

煤炭资源枯竭型城市绿色转型效率评价和影响因素——基于SBM与Tobit面板模型

考虑数据的客观性、科学性、全面性和可获得性,选择35个煤炭资源枯竭型城市作为研究对象,在构建煤炭资源枯竭型城市绿色转型效率评价指标体系和选择影响因素指标的基础上,收集2011—2019年35个城市的相关数据,利用SBM与Tobit面板模型,对煤炭资源枯竭型城市的绿色转型效率进行评价,并分析影响绿色转型效率的主要因素。研究结论表明:我国煤炭资源枯竭型城市的绿色转型效率整体水平比较低;只有铜川市的绿色转型效率达到最优水平,其他城市均存在效率损失;科学技术支出对煤炭资源枯竭型城市的绿色转型效率影响最大;经济发展水平对绿色转型效率有正向影响,而经济开放水平对绿色转型效率有负向影响。

基于超效率DEA-Malmquist指数模型的重庆市制造业绿色全要素生产率评价

采用超效率DEA-Malmquist指数方法,对2011-2019年重庆市29个制造业的绿色全要素生产率进行了测试。研究发现:重庆市制造业年均GTFP具有波动性。总体技术效率的提高主要来源于生产规模的优化,技术进步不足抑制了重庆市制造业GTFP的增长。但技术进步是驱动大多数各行业绿色全要素生产率的主要因素;不同行业的技术效率差异来源于纯技术效率的不足。

用水平土柱与Green-Ampt模型方法测量土壤入渗性能的原理与误差

土壤入渗是自然界水循环中的一个重要环节。研究提出了一种新的方法,根据水量/物质平衡原理和水平土柱中土壤剖面含水率分布所遵循的Green-Ampt模型中的活塞假定,测量和计算土壤入渗性能。用天然容重下的风干砂壤土,通过室内水平土柱试验,说明了获取数据的实验方法、过程,并利用提出的数学模型计算得到土壤入渗性能曲线。利用测量得到的土壤入渗性能回归计算得到的入渗水量分别与实际供水量和由土壤含水率的实际分布计算得到的入渗水量进行对比,得到相对误差分别为11.5%、15.89%,而实际供水量与由土壤含水率实际分布计算得到的水量之间的相对误差只有1.02%,说明了该方法的测量精度以及方法精度有进一步提高的可能性。该方法与传统的土壤入渗率测量方法相比,可以测量出土壤初始很高的入渗率,而且试验操作简单,省水,省时,为相关研究提供了有力的工具。

基于Green-Ampt和Philip模型的波涌灌间歇入渗模型研究

为了进一步揭示波涌灌间歇入渗的影响机制与规律,基于Green-Ampt和Philip入渗模型理论,建立了波涌灌间歇入渗分区模型,将第2供水周期及其后的供水周期内形成的入渗湿润区分别划分为重力势湿润区和基质势湿润区,并阐述了基于间歇入渗过程湿润区的分区入渗理论,通过Green-Ampt模型和Philip模型参数间的内在联系,建立了关于土壤体积含水率增量与累积入渗量之间的数学模型,并进一步根据土壤体积含水率增量与累积入渗量之间的线性图形特征,确定了不同分区下各供水周期的水分运动参数,分别为湿润锋面处吸力hf与表征饱和导水率Ks,且各间歇周期供水阶段的hf随着周期数的增大呈减小趋势,最后,利用分区模型将不同供水周期下的累积入渗量与湿润锋运移距离计算值同实测资料相比较,与实际值相比总体平均相对偏差分别为3.6%和8.6%,改进模型的适用性较好,拟合精度较高。因此,该模型可以较准确地描述波涌灌间歇入渗机理,为波涌灌灌水技术的合理设计提供了理论依据。

基于Green-Ampt模型的变水头积水入渗模型建立及其参数求解

通过对变水头积水入渗物理机制的分析,将入渗水头对入渗的影响归结为对表面饱和导水率的影响,基于Green-Ampt入渗模型,引用了湿润区的平均含水率的概念,并考虑了湿润区平均含水率随入渗时间的变化,建立了具有物理意义的3种变水头积水入渗模型,分析了利用入渗率-累积入渗量及入渗率-真实湿润锋图形获得模型参数的求解方法。通过室内试验,得到了湿润区的平均含水率与入渗时间之间呈乘幂函数变化的规律。利用实测资料对模型及其参数求解的方法进行检验,结果表明所建立的3种模型是正确的,求解参数的方法合理。

基于BISQ模型的双相介质位移场Green函数

以BISQ模型的波传播方程为基础 ,研究了弹性波在孔隙各向同性介质中的传播速度及与流体的Biot流动和喷射流动力学机制的关系 ,进一步利用场势分解和δ函数的性质 ,给出了同时受Biot流动和喷射流动两种动力学机制作用下 ,两相介质波场位移在集中力作用下的Green函数 ,并讨论了喷射流动在Green函数中的表现形式和作用 .

Green-Ampt两阶段模型的平移及衔接

概述了Green-Ampt模型的发展情况。由于通过Green-Ampt模型,直接计算的累积入渗量结果,与实测值相差较远,为了完善Green-Ampt两阶段模型的累积入渗量随时间变化的曲线,采用了先平移后衔接的方法。通过实验模拟,经该方法修正的计算值与实测值吻合较好。证明该方法能有效地改善Green-Ampt两阶段模型的模拟值,使其更符合实际情况。应用该方法能更准确地计算出累积入渗量随时间的变化过程,对完善Green-Ampt模型,扩展其应用范围有重要意义。

应用Green-Ampt(1973)模型解析三峡库区滑坡土入渗过程的探究

通过试验验证的方法探讨应用Green-Ampt(1973)理论解析模型推求三峡库区典型滑坡土体降雨入渗过程的可行性.研究中的试验设计为建立在对三峡库区滑坡地质灾害的分布及诱灾降雨进行调查统计的基础上,并考虑了Green-Ampt(1973)模型成立的前提条件.通过对试验及解析结果的对比分析得出的结论为,若用该解析模型来推求三峡库区滑坡土体的降雨产流及入渗过程,相关的边界条件假设、推导公式、计算参数取值等仍需大量的试验研究来改进与修正,同时给出了下一步研究工作的建议.

“中四角”绿色水资源利用效率时空分异及其影响因素——基于非期望产出SBM-DEA和地理探测器模型

利用非期望产出SBM-DEA模型测度了2010-2019年“中四角”绿色水资源利用效率(GWUE),采用空间自相关及冷热点分析方法探索GWUE的时空分异特征,并运用地理探测器模型深入探寻GWUE空间分异的关键影响因素。结果表明:(1)“中四角”GWUE高效区主要来源武汉城市群,低效区主要来源于环鄱阳湖城市群;各城市的GWUE具有明显的时空差异性,空间自相关性不显著,但空间分布格局由随机分布逐渐向集聚分布演变。(2)2010年经济发展水平和人口密度是影响“中四角”GWUE空间分异的主要因素,2015年经济发展水平和医疗资源占用情况成为GWUE空间分异的主要推动因子,2019年医疗资源占用情况和政府重视程度对GWUE空间分异起决定作用。