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学者姓名：张延吉
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Abstract ：
As urbanization progresses, efficient land resource management is essential for sustainable urban development. While existing studies emphasize the positive impact of urban economic linkages (UEL) on urban land-use efficiency (ULUE), they often assume equal partnerships, overlooking the asymmetric nature of UEL. This study uses a modified gravity model and super-efficiency SBM model to explore the impact of unequal economic linkages within the UEL network on ULUE across 284 Chinese cities from 2002 to 2021. The findings reveal that ULUE increased until 2017 but declined thereafter. Cities in the southeastern coastal regions show higher ULUE, while those in the northeast exhibit lower efficiency. The Tobit model analysis indicates that cities with greater dominance in the UEL network tend to have higher ULUE, while those more dependent on external economies experience lower ULUE. Robustness checks confirm the stability of these results across different model specifications. The study underscores the importance of fostering more balanced economic linkages and advocates for policy reforms aimed at enhancing urban economic integration to improve ULUE across cities.
Keyword ：
Economic dependency Economic dependency Economic linkages Economic linkages Network dominance Network dominance Urban land use efficiency Urban land use efficiency Urban sustainability Urban sustainability
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| GB/T 7714 | Zhang, Shuyu , Wei, Fei , Zhang, Yanji et al. Unequal partnerships: Asymmetrical effects of urban economic linkages on land-use efficiency in 284 cities, China [J]. | LAND USE POLICY , 2025 , 155 . |
| MLA | Zhang, Shuyu et al. "Unequal partnerships: Asymmetrical effects of urban economic linkages on land-use efficiency in 284 cities, China" . | LAND USE POLICY 155 (2025) . |
| APA | Zhang, Shuyu , Wei, Fei , Zhang, Yanji , Li, Yayu , Zhu, Lingjia , Guo, Huagui . Unequal partnerships: Asymmetrical effects of urban economic linkages on land-use efficiency in 284 cities, China . | LAND USE POLICY , 2025 , 155 . |
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Previous literature on the notion of escalator regions has focused on the impact of unidirectional spatial mobility on intragenerational mobility. Using data from the Chinese General Social Survey conducted in 2010, 2013, and 2015, this study elucidates the effects of bidirectional spatial mobility on intergenerational social mobility and its mechanisms. Consistent with the escalator region theory, a migration premium exists in contemporary China. Whether moving upward or downward across the urban hierarchy, migrants can achieve more proportional upward intergenerational mobility than non-migrants. However, the escalator regions for each directional migrant subgroup and their underlying mechanisms of social mobility are somewhat different. The positive impact of downward spatial mobility on intergenerational mobility is largely due to one-off elevator effects in the relatively populous or economically advanced destination cities. In contrast, all destination cities, not just the core cities, can act as escalator regions for upward migrants as a result of long-term escalator effects. These conclusions generally apply to migrants with and without local hukou. However, compared to local hukou migrants, non-local hukou migrants' opportunities for social advancement are largely constrained by institutional discrimination, so they depend more on the continuing escalator effect that takes time to accumulate human and social capital to realize upward intergenerational mobility.
Keyword ：
Bidirectional migration Bidirectional migration China China elevator effect elevator effect escalator effect escalator effect escalator region escalator region intergenerational mobility intergenerational mobility
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| GB/T 7714 | Zhang, Yanji , Wang, Jiejing . Bidirectional spatial mobility and intergenerational social mobility in contemporary China: the role of escalator regions [J]. | EURASIAN GEOGRAPHY AND ECONOMICS , 2025 . |
| MLA | Zhang, Yanji et al. "Bidirectional spatial mobility and intergenerational social mobility in contemporary China: the role of escalator regions" . | EURASIAN GEOGRAPHY AND ECONOMICS (2025) . |
| APA | Zhang, Yanji , Wang, Jiejing . Bidirectional spatial mobility and intergenerational social mobility in contemporary China: the role of escalator regions . | EURASIAN GEOGRAPHY AND ECONOMICS , 2025 . |
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Abstract ：
犯罪地理研究始终存在重视客观犯罪、轻视主观感知的缺憾.论文以北京为案例,采用深度学习中的图像回归算法,大规模识别不同街景环境下的犯罪恐惧感,以弥补社会调查在空间覆盖率、空间分辨率以及信度效度等方面的不足.研究表明:①犯罪恐惧感的空间格局呈现出由中心向郊区逐渐递增的圈层式、多组团、放射状结构,盗窃及暴力犯罪量的空间分布与之大相径庭.②由犯罪恐惧感与犯罪活动的空间分布匹配关系可见,在北京市中心,主客观安全性具有低匹配度且客观形势比主观感知更危险;至近郊,两者匹配度提高;至远郊,两者仍具低匹配度但客观形势比主观感知更安全.③主客观安全性的影响因素不尽相同.高密度、混合型环境有利于降低恐惧感却会诱发犯罪;增设尽端路、提升围合感、增加绿视率、整治物理失序则能发挥抑制恐惧感和犯罪量的双重功效;弱势社区兼具高恐惧感与高暴力犯罪量,人员流动性有助弱化恐惧感,居民异质性仅会加剧犯罪行为.研究结果有助于厘清经典犯罪地理理论对主客观安全性的差异化解释力,以全面评估环境干预政策的安全性后果.
Keyword ：
建成环境 建成环境 深度学习算法 深度学习算法 犯罪恐惧感 犯罪恐惧感 社会环境 社会环境 街景图像 街景图像
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| GB/T 7714 | 张延吉 , 黄佳玲 , 游永熠 . 犯罪恐惧感的空间格局、影响因素及其与犯罪活动的异同 [J]. | 地理科学进展 , 2024 , 43 (11) : 2271-2283 . |
| MLA | 张延吉 et al. "犯罪恐惧感的空间格局、影响因素及其与犯罪活动的异同" . | 地理科学进展 43 . 11 (2024) : 2271-2283 . |
| APA | 张延吉 , 黄佳玲 , 游永熠 . 犯罪恐惧感的空间格局、影响因素及其与犯罪活动的异同 . | 地理科学进展 , 2024 , 43 (11) , 2271-2283 . |
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为弥补用地效率研究缺乏全域评估、存在概念混淆、难以指导实务等不足，本文以中国31个省、自治区、直辖市的2 165个市辖区、县级市、县为分析单元，采用SBM-undesirable模型计算各区市县城市建设用地利用效率，量化用地效率与供应的匹配程度和匹配类型，以为指标分配提供依据。中国城市建设用地效率整体偏低，保守估计，近七成区市县拥有冗余用地；若要达到最优效率，全国可削减冗余城市建设用地2.45万km~2。人口规模、行政等级与用地效率呈U型关系，人均GDP对用地效率具有边际递减的正向影响。中国城市面临用地利用效率与用地供应速率的空间错配问题，应根据两者匹配关系分类施策，对“效率不足-供应过剩型”和“效率较高-供应不足型”区市县的计划及周转指标分别给予压缩和调增，以实现总量稳定、效率提升、刚弹结合、动态调整的用地指标分配优化目标。
Keyword ：
土地利用效率 土地利用效率 城市建设用地 城市建设用地 数据包络分析 数据包络分析 用地指标 用地指标
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| GB/T 7714 | 张延吉 , 邓伟涛 , 赵立珍 . 城市建设用地效率评价与用地分配优化策略——基于中国2 165个市辖区、县级市和县的实证分析 [J]. | 城市规划 , 2024 , 48 (06) : 83-90 . |
| MLA | 张延吉 et al. "城市建设用地效率评价与用地分配优化策略——基于中国2 165个市辖区、县级市和县的实证分析" . | 城市规划 48 . 06 (2024) : 83-90 . |
| APA | 张延吉 , 邓伟涛 , 赵立珍 . 城市建设用地效率评价与用地分配优化策略——基于中国2 165个市辖区、县级市和县的实证分析 . | 城市规划 , 2024 , 48 (06) , 83-90 . |
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ObjectivesTo examine the causal impact of small businesses on street theft and the underlying mechanisms.MethodsThe "Cleanup Holes in the Wall" campaign in Beijing, China, provides a rare opportunity for a natural experiment. Drawing on street view images processed by deep learning algorithms and other big data sources such as court judgments and location-based service (LBS) population, we use difference-in-difference (DID) models to investigate how the disappearance of small businesses leads to changes in the occurrence of theft. We further examine the mechanisms by introducing mediators, including ambient population and social activity.ResultsThe treatment units that experienced a mass loss of small businesses showed a significant reduction in street theft compared to the control units that were less affected by the cleanup campaign. Ambient population and social activity played a mediating role in promoting and deterring crime, respectively, with the former dominating. The results remain robust after including covariates in the models, balancing covariates using the propensity score matching method, and adopting alternative thresholds to classify the treatment group.ConclusionsThere are two competing yet coexisting mechanisms through which small businesses influence street theft. On the one hand, commercial premises provide large numbers of criminal opportunities for potential offenders; on the other hand, they are central to local social control and order. While small businesses exercise a certain amount of natural surveillance power, as a whole, they function primarily as crime generators. Implications for implementing targeted policies tailored to the nature of small businesses are discussed.
Keyword ：
Deep learning algorithm Deep learning algorithm Difference-in-difference model Difference-in-difference model Small business Small business Street theft Street theft Street view image Street view image
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| GB/T 7714 | Zhang, Yanji , Cai, Liang , Song, Guangwen et al. Causal Effect of Small Businesses on Street Theft: Evidence from a Natural Experiment of the Beijing Cleanup Campaign [J]. | JOURNAL OF QUANTITATIVE CRIMINOLOGY , 2024 , 40 (4) : 727-760 . |
| MLA | Zhang, Yanji et al. "Causal Effect of Small Businesses on Street Theft: Evidence from a Natural Experiment of the Beijing Cleanup Campaign" . | JOURNAL OF QUANTITATIVE CRIMINOLOGY 40 . 4 (2024) : 727-760 . |
| APA | Zhang, Yanji , Cai, Liang , Song, Guangwen , You, Yongyi . Causal Effect of Small Businesses on Street Theft: Evidence from a Natural Experiment of the Beijing Cleanup Campaign . | JOURNAL OF QUANTITATIVE CRIMINOLOGY , 2024 , 40 (4) , 727-760 . |
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利用高精度活动人口数据,整合空间自相关分析与多中心模型,识别2019年297个地级及以上城市的所有中心地,从中心数量、距离、均衡性评价多中心程度,基于前述3大指标归纳出10类城市空间结构模式.研究表明,除少量分散型城市,中心数越多,相应城市越少;山地海岛、与邻省交界或发达城市更易远离主中心形成副中心;组团式布局的大城市和强县弱区型中小城市具有相对均衡的多中心,圈层扩张型城市则多呈极化格局.经济社会发展水平提高是形塑多中心结构的首要因素,自然地形起伏助推多中心发育,但政府搬迁、兴建开发区等外迁政策对多中心程度并无显著影响,修建道路也难以壮大新中心.可见多中心结构是经济社会高水平发展的产物,而非跨越式打造而成的.
Keyword ：
多中心程度 多中心程度 空间结构模式 空间结构模式 空间自相关 空间自相关 负指数函数 负指数函数
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| GB/T 7714 | 张延吉 , 黄宏祥 , 林胜 . 中国城市多中心空间结构的发育程度、基本模式及影响因素 [J]. | 地理科学 , 2024 , 44 (5) : 766-774 . |
| MLA | 张延吉 et al. "中国城市多中心空间结构的发育程度、基本模式及影响因素" . | 地理科学 44 . 5 (2024) : 766-774 . |
| APA | 张延吉 , 黄宏祥 , 林胜 . 中国城市多中心空间结构的发育程度、基本模式及影响因素 . | 地理科学 , 2024 , 44 (5) , 766-774 . |
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利用高精度活动人口数据，整合空间自相关分析与多中心模型，识别2019年297个地级及以上城市的所有中心地，从中心数量、距离、均衡性评价多中心程度，基于前述3大指标归纳出10类城市空间结构模式。研究表明，除少量分散型城市，中心数越多，相应城市越少；山地海岛、与邻省交界或发达城市更易远离主中心形成副中心；组团式布局的大城市和强县弱区型中小城市具有相对均衡的多中心，圈层扩张型城市则多呈极化格局。经济社会发展水平提高是形塑多中心结构的首要因素，自然地形起伏助推多中心发育，但政府搬迁、兴建开发区等外迁政策对多中心程度并无显著影响，修建道路也难以壮大新中心。可见多中心结构是经济社会高水平发展的产物，而非跨越式打造而成的。
Keyword ：
多中心程度 多中心程度 空间结构模式 空间结构模式 空间自相关 空间自相关 负指数函数 负指数函数
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| GB/T 7714 | 张延吉 , 黄宏祥 , 林胜 . 中国城市多中心空间结构的发育程度、基本模式及影响因素——基于297个地级及以上城市的实证研究 [J]. | 地理科学 , 2024 , 44 (05) : 766-774 . |
| MLA | 张延吉 et al. "中国城市多中心空间结构的发育程度、基本模式及影响因素——基于297个地级及以上城市的实证研究" . | 地理科学 44 . 05 (2024) : 766-774 . |
| APA | 张延吉 , 黄宏祥 , 林胜 . 中国城市多中心空间结构的发育程度、基本模式及影响因素——基于297个地级及以上城市的实证研究 . | 地理科学 , 2024 , 44 (05) , 766-774 . |
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Abstract ：
为弥补用地效率研究缺乏全域评估、存在概念混淆、难以指导实务等不足,本文以中国31个省、自治区、直辖市的2 165个市辖区、县级市、县为分析单元,采用SBM-undesirable模型计算各区市县城市建设用地利用效率,量化用地效率与供应的匹配程度和匹配类型,以为指标分配提供依据.中国城市建设用地效率整体偏低,保守估计,近七成区市县拥有冗余用地;若要达到最优效率,全国可削减冗余城市建设用地2.45万km2.人口规模、行政等级与用地效率呈U型关系,人均GDP对用地效率具有边际递减的正向影响.中国城市面临用地利用效率与用地供应速率的空间错配问题,应根据两者匹配关系分类施策,对"效率不足-供应过剩型"和"效率较高-供应不足型"区市县的计划及周转指标分别给予压缩和调增,以实现总量稳定、效率提升、刚弹结合、动态调整的用地指标分配优化目标.
Keyword ：
土地利用效率 土地利用效率 城市建设用地 城市建设用地 数据包络分析 数据包络分析 用地指标 用地指标
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| GB/T 7714 | 张延吉 , 邓伟涛 , 赵立珍 . 城市建设用地效率评价与用地分配优化策略 [J]. | 城市规划 , 2024 , 48 (6) : 83-90 . |
| MLA | 张延吉 et al. "城市建设用地效率评价与用地分配优化策略" . | 城市规划 48 . 6 (2024) : 83-90 . |
| APA | 张延吉 , 邓伟涛 , 赵立珍 . 城市建设用地效率评价与用地分配优化策略 . | 城市规划 , 2024 , 48 (6) , 83-90 . |
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Using novel Internet search data from Baidu Index, this study examines for the first time the nationwide distribution of city-level intensity of online suicidal ideation in China and the underlying social determinants and processes. We find that the intensity of suicidal ideation shows moderate spatial clustering, decreasing from east to west nationally and from developed to less developed areas within each province. Overall, socioeconomic inequality, social fragmentation as represented by single-generation households and religiosity, and the proportion of older adults are positively associated with suicidal ideation. Social deprivation, divorce rate, and male-to-female sex ratio have significant negative effects on suicidal ideation, while marriage rate has insignificant effects. Further analyses based on geographically weighted regression suggest that the direction, magnitude, and statistical significance of the set of risk factors relevant to suicidal ideation vary by contexts and that city-specific interventions for suicide prevention are needed.
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| GB/T 7714 | Zhang, Yanji , Cai, Liang , Zhu, Chunwu . Understanding online suicidal ideation in China: nationwide distribution, social determinants, and geographic variations [J]. | HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS , 2024 , 11 (1) . |
| MLA | Zhang, Yanji et al. "Understanding online suicidal ideation in China: nationwide distribution, social determinants, and geographic variations" . | HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS 11 . 1 (2024) . |
| APA | Zhang, Yanji , Cai, Liang , Zhu, Chunwu . Understanding online suicidal ideation in China: nationwide distribution, social determinants, and geographic variations . | HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS , 2024 , 11 (1) . |
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This study examines the temporal changes in income segregation within the ambient population around the clock using mobile phone big data. It employs ordinal entropy, a metric suited for measuring segregation among ordered groups, to quantify the level of segregation among eight income groups within micro-geographic units throughout the 24-h period on a weekday and a weekend day in the urban core of Guangzhou, China. The study further decomposes daily segregation by location and time profile. We identify urban functions and neighborhood contexts relevant for income segregation and explore their temporal variation. Using group-based trajectory analysis, we classify daily segregation trends among 400 m urban grids into seven distinct trajectories for both weekday and weekend. Our findings confirm that segregation fluctuates constantly. The role of local urban functions, particularly retail, accommodation, and offices, and neighborhood context, such as the number of residents and the share of non-local migrants, exhibits a significant temporal rhythm. The seemingly convoluted 24-h segregation time series among urban grids follow just a few distinct trajectories with clear geographical patterns. There is limited variability at individual grids both over the course of a day and across days. Shifts across different trajectory types between weekday and weekend are rare. The dynamic daily segregation in the ambient population per se may be an enduring characteristic of neighborhoods and a real-time channel for neighborhood contextual influences, potentially fueling long-term residential segregation and neighborhood change.
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| GB/T 7714 | Cai, Liang , Song, Guangwen , Zhang, Yanji . Understanding neighborhood income segregation around the clock using mobile phone ambient population data [J]. | HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS , 2024 , 11 (1) . |
| MLA | Cai, Liang et al. "Understanding neighborhood income segregation around the clock using mobile phone ambient population data" . | HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS 11 . 1 (2024) . |
| APA | Cai, Liang , Song, Guangwen , Zhang, Yanji . Understanding neighborhood income segregation around the clock using mobile phone ambient population data . | HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS , 2024 , 11 (1) . |
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