Urbanization policy and economic development: A quantitative analysis of China's differential Hukou reforms

Published in Regional Science and Urban Economics, 2021 November, 91, Article number 103639. DOI: 10.1016/j.regsciurbeco.2020.103639</p

Central place theory and city size distribution

See concise video made by the Royal Economic Society where the author explains the paper.</p

Common power laws for cities and spatial fractal structures

Datasets for "Common power laws for cities and spatial fractal structures" Dataset S1 (distance_computation.zip) A ZIP file including a manual for the computation of bilateral distances and travel time among cities, as well as three associated python codes. Dataset S2 (cities.zip) A ZIP file including six CSV files. For each country, there is a corresponding file containing the population sizes and location information of cities. In each file, there are four columns: city ID (UA), population size (POP), longitude (LON) and latitude (LAT) of the the most densely inhabited location in the city according to the geodetic reference system, WGS1984. Dataset S3 (distances.zip) A ZIP file including six CSV files. For each country, there is a corresponding file containing the shortest bilateral road distance and driving time between each pair of cities. In each file, there are four columns: origin city ID (ORIG), destination city ID (DEST), the shortest-path distance in meters (DISTANCE), and the driving time along the shortest-time path in seconds (DURATION), where only the cases with ORIG<DEST are contained

The Study of Construction Methods on Groundsill Works－Example of “Erren Intake”

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive

High performance entanglement-assisted quantum LDPC codes need little entanglement

Though the entanglement-assisted formalism provides a universal connection between a classical linear code and an entanglement-assisted quantum error-correcting code (EAQECC), the issue of maintaining large amount of pure maximally entangled states in constructing EAQECCs is a practical obstacle to its use. It is also conjectured that the power of entanglement-assisted formalism to convert those good classical codes comes from massive consumption of maximally entangled states. We show that the above conjecture is wrong by providing families of EAQECCs with an entanglement consumption rate that diminishes linearly as a function of the code length. Notably, two families of EAQECCs constructed in the paper require only one copy of maximally entangled state no matter how large the code length is. These families of EAQECCs that are constructed from classical finite geometric LDPC codes perform very well according to our numerical simulations. Our work indicates that EAQECCs are not only theoretically interesting, but also physically implementable. Finally, these high performance entanglement-assisted LDPC codes with low entanglement consumption rates allow one to construct high-performance standard QECCs with very similar parameters.Comment: 8 pages, 5 figures. Published versio

An Experiment Study on the Relationship between Wave Transmission and the Culvert Pipes Block with Constrict Section

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv