Application of Multi-agent Models to Urban Expansion in Medium and Small Cities: A Case Study in Fuyang City,Zhejiang Province,China

In this study, three-phase satellite images were used to define rules for the allocation of time and space in construction land resources based on a complex adaptive system and game theory. The decision behavior and rules of government agent, enterprise agent and resident agent in construction land growth were explored. A distinctive and dynamic simulation model of construction land growth was built, which integrated multi-agent, GIS technology and RS data and described the interaction among influencing agents, Taking Fuyang City in the Changjiang River Delta as an example, an assessment process for the remote sensing data in construction land and scenario planning was constructed. Repast and ArcGIS were used as simulation platforms. A simulation of the spatial pattern in land-use planning and the setting of scenario planning were conducted by using the incomplete active game, which was based on different natural, social and economic levels. Through this model, a simulation of urban planning space and decision-making for Fuyang City was created. Relevant non-structured problems arising from urban planning management could be identified, and the process and logic of urban planning spatial decision-making could thus be improved. Cell-by-cell comparison showed that the simulation accuracy was over 72%. This model has great potential for use by government and town planners in decision support and technique support in the policy-making process.

On the Development Principles and Models of Recreational Belt around Small and Middle Cities

The definition and type of recreational belt around metropolis were introduced,the development principles of recreational spot around small and middle cities were analyzed.With Baoding City as an example,the empirical analysis was conducted,and the development models of recreational spot around metropolis in Baoding City were put forward.

The Optimization on Operation Characteristicsof Urban Medium Voltage Network

Traditional small current grounding system has many advantages. Pilot operation shows that optimized one has even better operation characteristics. It has proven to be a geenrallly properand relatively perfect neutyal grounding method in urban MV network.

POPULATION EXPANSION IN CHINA'S METROPOLISES AND ITS SCALE-CONTROL

Metropolises are centers of politics, economy, culture and information, and also economic growth poles in comparatively large areas. After 1949, China’s urban structure have changed greatly, from original 'pyramid' shape into 'upside -down pyramid' shape, that is, more megalopolises and metropolises, fewer medium-sized and small cities. The most distinguishing feature of urban population growth was the remarkable increase of population in megalopolises and metropolises. The key reason for urban population expansion is to want to obtain the benefits of scale -agglomeration economy of metropolises. The number of urban functions directly determines the quality and quantity of urban population. Metropolises appeal not only agricultural population but also the population of medium-sized and small cities, which put much more population pressure on metropolises. The ideal goals of scale-control of metropolitan population are discussed in terms of economy, society and ecollogy. In order to control the

Impact of City Scale and Regional Difference on Small & Medium-Sized Cities' Development and Its Implication

By studying the relationship between urban development performance and city scale and regional difference, this paper aims at revealing the real challenges faced by small and medium-sized cities(referred to as SMSC hereafter) in China. It analyzes the growth of different-sized cities, their positions in China's overall urban system, the influence of city scale on their capability in migrant absorption, economic development, public service, and environmental remediation, as well as the capability difference among SMSCs. Results show that city scale is less a determinant in economic development capability and per capita ownership of public service than in economic performance, quality of public service, and environmental remediation capabilities. Besides, there are many other factors determined by regional differences instead of city scale. Therefore, in the context when SMSC plays an increasingly important role in the process of urbanization, relevant parties should avoid the "trap of scale," and re-position urbanization within the framework of sustainable development.

The Dilemma and Way-Out of Urban and Rural Planning Management in China's Small and Medium-Sized Cities

In China, for small and medium-sized cities, urban and rural planning management should play an important role during the process of urbanization. However, it failed to do that in reality due to a series of limits, such as local fiscal deficiency, scarce human resources, incomplete management systems, historic planning defects, inadequate supervisions, and imperfect regulations, etc. This paper made a comprehensive analysis on the dilemma of urban and rural planning management in China's small and medium-sized cities and the interests and status of the government, enterprises and public in space resource allocation and put forward the methods to improve the quality of planning management in China's small and medium-sized cities from the view of systems and mechanisms.

数字金融发展与中小城市劳动力回流——基于CHFS数据的考察

伴随着数字技术的日新月异,数字金融发展给中小城市吸引劳动力回流带来了重要机遇。基于经典理论对劳动力回流动机的阐述,借助2017年和2019年CHFS数据,运用Logit模型实证检验了数字金融发展对中小城市劳动力回流的影响。研究发现:数字金融发展在研究期内能够有效吸引中小城市劳动力回流,这一结论在经过内生性讨论和一系列稳健性检验后依然成立;机制检验表明,数字金融发展通过提高预期收入进而吸引劳动力回流的作用渠道存在,创业环境在数字金融发展促进劳动力回流过程中发挥了中介作用,数字金融发展吸引劳动力回流的过程受到了数字经济发展的正向调节;异质性分析显示,更小家庭规模的劳动力在回流过程中对数字金融发展更为关注,其他婚姻状况和已婚且年龄较大的劳动力在回流过程中受数字金融发展的吸引更强,传统金融发展水平较高城市的回流劳动力更加关注数字金融发展。研究结论丰富了学界对劳动力回流的认知,为后续相关研究和政策制定提供了参考。

台风-浪-流耦合作用超大浮体水弹性响应分析方法

海上机场超大浮体结构在台风等极端海洋环境下的动态响应准确预测是保障其安全性能的关键前提,其难点在于准确构建中/小尺度复杂流场与浮体结构的流固耦合计算模型。本文提出了一种基于中/小尺度嵌套的海上机场超大浮体水弹性响应分析方法,二次开发实现了台风-浪-流耦合模拟,分析了超强台风“莫兰蒂”途经海上机场超大浮体全过程台风-浪-流时空演变规律;采用中/小尺度流场嵌套技术计算水动力和气动力,代入结构动力学方程进行双向迭代解耦求解;通过算例分析了台风-浪-流耦合作用下浮体结构水弹性响应及影响机制。研究表明:本文提出的方法能够有效地预测此类极端环境下超大浮体结构水弹性响应。

基于CCR模型的中小城市公交运行效率评价方法

为了缓解资源的有限性和城市公交服务日益增长需求对公交系统运营和发展带来的压力,提高公交线路运行效率,构建以线路长度、重复系数、非直线系数、站点覆盖率、站点数量和线网密度为投入指标,线路可达性和行车准点率为产出指标的评价指标体系,采用数据包络分析法中的CCR模型对公交线路运行效率进行评价。以本溪市主城区16条公交线路运营情况为例,进行有效性分析。分析结果表明:1路、9路、25路、26路、32路、33路综合效益值均小于1,线路运行效率仍有待提升,其中线路长度、站点数量两个指标影响程度较高,可基于实际情况对该指标进行优化,提高线路运行效率。研究成果可为本溪市公交发展与城乡规划提供参考依据,也可为中小城市公交线路运行效率评价提供新的思路。

中小城市本科院校助力共同富裕的角色与路径研究

中小城市本科院校是我国高等教育系统中不可或缺的一部分。中小城市本科院校在促进共同富裕中扮演着助力地方经济发展、推动形成橄榄型社会结构、提升教育公平正义,以及促进人民精神生活共同富裕的多重角色。中小城市本科院校助力共富的实现路径在于深化校地合作,这要求中小城市本科院校与城市形成“共享价值”、加强顶层设计、完善治理结构、改进教师评价机制,以及培育具有服务意识与精神的领导核心。

中小城市市域社会治理现代化:现状、困境与对策

党的十九届四中全会提出“加快推进市域社会治理现代化”,作为构建国家治理体系现代化与基层社会治理格局的创新举措,为基层社会治理现代化找到了新出路。现阶段,中小城市市域社会治理现代化仍处于摸索前进阶段,存在组织动员困难、治理主体能力遭受挑战、治理能动性不强、治理效率低下等困境。破解中小城市市域治理现代化困境,需要从凸显市域层面统筹优势、强化各治理主体共建共治作用、提升市域社会治理现代化水平、增强市域社会治理内生动力、筑牢市域社会治理现代化基石等方面发力。

基于社区生活圈的中心城区防灾分区划定研究——以湖南省花垣县为例

结合居民日常生活范围、政府行政管理单元、避难行为与需求进行防灾分区的划定是未来趋势。首先,从出行需求、层级划分及设施配套3个方面对社区生活圈与防灾分区进行对比,梳理出符合我国规划体系的防灾分区等级划分,并明确各级防灾分区的服务规模与设施配套;其次,提出一套考虑居民防灾避难行为和避难时间,以避难场所和应急救援防灾设施的服务范围分析为基础,结合社区生活圈空间范围的防灾分区定量划定方法;最后,将该方法应用于湖南省花垣县中心城区的防灾分区划定实践,提出相关防灾设施用地的优化调整建议。研究成果可为国土空间规划综合防灾专项规划编制中的防灾分区划定提供技术和方法参考。

云南昭通中小径笋用竹造林中乔木树种配置

在系统整理金佛山方竹、筇竹等中小径笋用竹相关研究成果的基础上,结合云南省昭通市的实际情况,分析中小径笋用竹的特点和乔木对中小径笋用竹林的作用,总结了在营造中小径笋用竹林中乔木树种配置的原则和方法。中小径笋用竹林竹鞭分布较浅,常与乔木或灌木混生,较耐荫;在中小径笋用竹林中配置乔木,具有庇荫、增加土壤肥力、改善土壤结构、增加群落稳定性、提高竹林生物量等作用;选择乔木树种应遵循生长快、价值高、寿命长、深根性、喜光、以落叶乔木为主的原则,根据树种生物学特性、乔木层郁闭度并结合林分经营目的、经营水平选择合适的配置密度。为昭通市中小径笋用竹造林推荐了19个乔木树种,适宜的乔木种植密度为5~42株/667 m^(2)。

从新经济地理学视角看京津冀协同发展

京津冀协同发展作为重大国家战略,是拉动全国经济发展的一大重要引擎,有序疏解非首都功能无疑是京津冀协同发展的战略核心和重中之重。以往的研究视角大多围绕北京展开讨论,忽略了对周边中小城市的承载力和吸引力的分析。以新经济地理学为视角,可以结合ABM构建一个基于垄断竞争、集聚与规模经济、交通成本、市场一体化的多区域空间分析框架。通过政策模拟不难发下如下四点:第一,中小城市基础设施的改善有利于疏解,但存在“门槛效应”,跨过“门槛”才能实现有效疏解;第二,提高中小城市与中心城市之间的交通连通性,能够进一步提升疏解效果;第三,通过创新提升本地产品的多样化和差异化多样程度,并建立市场的开放制度,通过企业进入与退出的市场竞争机制,实现高质量的疏解与集聚;第四,通过企业和人才补贴,可以短期内提升中小城市的市场规模,促进企业和人口的流动。

科技创新走廊赋能中小城市产业发展研究——以广西L市为例

科技走廊,是在空间地理上呈现出带状或者条状的科技创新集聚区。文章以广西L市为例,探讨中小工业城市如何通过借鉴科技创新走廊建设经验来促进产业发展。通过调研L市工业产业和企业现状,参考长三角G60科创走廊和广深港澳科技创新走廊沿线城市的成功做法,提出了完善城市科技发展规划、强化产业规划、建设产业联盟共享平台、成立科技商学院、设立科创中心、紧密协同高校与科研机构、构建科技金融生态系统等七个提升L市科技创新能力的建议,以期为其他中小城市提升科技创新能力、推动经济高质量发展提供参考。

基于大数据背景下的中小城市停车治理研究

中小城市城镇化和机动化的快速发展,给城市停车带来较大的压力。为了解决民生痛点,提升居民出行品质,有必要以大数据为手段,加强中小城市停车治理研究。本文通过对城市现有停车资源进行系统评估,从发展策略、建筑物停车配建指标制定、路外公共停车场布局规划、路内停车设施规划以及智慧停车系统建设的角度提出治理方案。以伊春市中心城区停车治理为例,通过建立分区的停车配建标准、多渠道挖潜公共停车泊位、动态评估调整路内停车泊位、建设智慧停车系统和推进停车共享等举措,伊春市中心城区的停车更加有序和高效,停车管理效能大幅提升。

荆门市加快培育专精特新中小企业难点及对策研究

专精特新企业是市域推动产业转型升级,加快实体经济高质量发展的重要力量。调研发现,荆门市专精特新中小企业规模不断壮大、所属产业分布广泛、企业专业化程度提升明显,但还存在整体发展能级不高、偏重传统制造业、持续创新竞争能力不足等现实问题;专精特新中小企业在成长中面临政府培育与企业自身发展两方面的难点。对此,应以问题为导向,加大政策扶持力度;加强分类指导,健全梯次培育体系;整合平台资源,构建协同服务体系;强化人才培养,提升人才素质;强化金融精准扶持。以此促进荆门市专精特新中小企业高质量发展。

基于静态数据分析的中小城市城市设计——以成安县为例

我国的中小城市在数量和比例上占据着主要地位。然而,由于现实条件和资源禀赋的不同,中小城市的城市设计与大城市相比存在明显差异。随着大数据时代的到来,城市设计得以多元化和差异化发展。文章通过对成安县进行静态数据的收集和整理,发现了县域中心城区存在的核心问题,进而在城市设计层面上明确了设计策略。这些策略旨在增加城市的功能性和美观度,满足市民的需求,并推动中小城市的可持续发展。

生态位视角下的中小城市常规公交系统建设适宜度评价

当前对于常规公交系统建设中所采用的线性增长指标是否能较好地贴合一个城市内公交系统的发展水平,在建设评价的过程中没有得到明确体现。同时中小城市公交系统相较于大城市有其自身的发展特点,为确保公交系统建设与城市发展相匹配,文章引入生态学的相关原理,将公交系统视作一个“活”的生态体系,结合其生态学特征,运用生态位理论,从自然质量、社会经济和综合效益三个维度,构建中小城市公交系统建设适宜度评价指标体系,并提出基于生态位适宜度理论的公交系统建设适宜度评价方法。对我国56个中小城市的公交系统建设适宜度进行计算和分类,分析不同城市公交系统建设的差异性,结果表明:公交线路、线网长度和固定资产投资等指标表现出较高的重要性;自身的建设标准仍是决定性因素,但需要与城市发展相匹配,不能忽视城市经济水平、人口需求等在公交系统建设发展中所起到的作用。