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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：International trade and Covid-19: City-level evidence from China's lockdown policy
国际贸易 新冠肺炎 中国封锁政策 城市证据
2023/5/16
We examines the impact of Covid-19 lockdowns on exports by Chinese cities. We use city-level export data at a monthly frequency from January 2018 through April 2020. Differences-in-differences estimat...
Representation of a 3-d City Model in Spatial Object-relational Databases
Databases GIS Modeling
2015/7/6
Three-dimensional city models become more and more important in many GIS applications. Examples are, apart from simple
visualization, city and land use planning as well as telecommunication planning ...
Mathematics and Morphogenesis of the City, A Geometrical approach
Adaptation and Self-Organizing Systems(nlin.AO) Mathematical Physics(math-ph) Physics and Society(physics.soc-ph)
2010/11/10
Cities can be compared to living organisms. They are out of equilibrium, opened systems that never stop developing and sometimes die. The city’s growth is guided by needs in local distribution and in ...