合协调中国城市聚合区新型城市化 - - 城市聚合区的特点和驱动因素
Mingtao Yan1,2, Jianji Zhao3,4, Shuwan Yan5
1Key Research Institute of Yellow River Civilization and Sustainable Development, Henan University, Kaifeng, 475001, China.
概括
中国的新型城市化显示出更好的协调,东部城市化水平更高. 经济,人口和空间因素是关键驱动因素,区域差异和相互作用影响发展.
科学领域:
- 城市和区域规划 城市和区域规划
- 可持续发展 可持续发展 可持续发展
- 空间经济学 空间经济学
背景情况:
- 新城市化 (NU) 对于可持续的城市发展和实现中国式现代化至关重要.
- 了解新城市化子系统中的合和协调机制至关重要.
研究的目的:
- 分析中国城市聚合区新型城市化 (CCDNU) 的合协调度的时空演变.
- 确定CCDNU的驱动因素,考虑空间溢出效应和区域异质性.
- 为优化新城市化提供政策建议.
主要方法:
- 将NU合协调分成五个维度:经济,人口,土地,社会和生态.
- 使用来自中国19个城市聚集区的200个城市的数据,对CCDNU的时空空间分析.
- 通过空间溢出效应,分层异质性和相互作用检测来分析驱动因素.
主要成果:
- 在中国东部,CCDNU已经从中度混乱发展到几乎没有协调,在中国东部有更高的水平和积极的空间自相关性.
- 经济动力,人口集中,空间承载能力和环境质量有利于区域CCDNU,而某些因素阻碍了邻近地区.
- 空间承载能力,人口集中和经济驱动力是主要因素,直接和间接影响的时间积累是显著的.
结论:
- 中国的新型城市化正在向更好的协调发展,受经济,人口和环境因素的复杂相互作用的影响.
- 主要的驱动因素在区域上有所不同,这凸显了对量身定制的政策干预的需要.
- 驱动因素之间的相互作用显著增强或非线性影响CCDNU,需要综合政策方法.
相关概念视频
01:27¹H NMR: Long-Range Coupling
1.8K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.8K
02:57Coordination Number and Geometry
16.2K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
16.2K
02:12Relationship Formation
40.2K
What do you think is the single most influential factor in determining with whom you become friends and whom you form romantic relationships? You might be surprised to learn that the answer is simple: the people with whom you have the most contact. This most important factor is proximity. You are more likely to be friends with people you have regular contact with. For example, there are decades of research that shows that you are more likely to become friends with people who live in your dorm,...
40.2K
00:49Ligand Binding and Linkage
4.8K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
4.8K
02:42Valence Bond Theory
8.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.9K
02:29Hybrid Zones
17.2K
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
17.2K