Mixed Land Use Evaluation and Its Impact on Housing Prices in Beijing Based on Multi-Source Big Data

The tense relationship between the supply and demand of land resources and the past spatial expansion of urban development in Beijing have brought many urban problems. Mixed land use is considered to be able to solve these urban problems as well as promote sustainable urban development. In this context, this study uses multi-source big data such as POI, OpenStreetMap and web crawler data to construct current land-use data of the area within the sixth ring road of Beijing, and then uses the entropy index and type number index to analyze the spatial distribution and aggregation characteristics of the mixed land-use level. Finally, a multi-scale geographically weighted regression is applied to explore the impact of the block and life circle scale mixed land use on housing prices. The results show that: (1) the accuracy of land use data obtained by using multi-source big data is high, and the consistency with the real land use situation is as high as 82.67%. (2) the mixed land use level in the study area is higher in the urban center and lower in the periphery of the city. However, it does not show the spatial distribution characteristics gradually decreasing with the increase of the distance from the urban center but shows that the area from the third to the fifth ring road is the highest. (3) the impact of block scale and life circle scale mixed land use on housing price is different. The type number index has a negative effect on the housing price in block scale mixed land use, while the entropy index has a positive effect on the housing price in life circle scale mixed land use. Based on the existing “bottom-up” individual-dominant development mode, the government of Beijing should issue relevant policies and documents to give “top-down” control and guidance in the future, so as to promote the maximization of the benefits of mixed land use. Furthermore, in the practice of mixed land use in Beijing, land use types should be reduced at the block scale and the area of different land use types should be balanced at the life circle scale.

Analysis and optimization of 15-minute community life circle based on supply and demand matching: A case study of Shanghai

The 15-minute community life circle (15min-CLC) strategy is one of Shanghai’s important methods for building a global city and facing a society with a more diverse population structure in the future. In the existing research, the balance between the construction of the life circle and the needs of the people in the life circle still needs to be further fulfilled. This paper is based on the city’s multi-source large data set including 2018 AutoNavi POI (Point of Interests), OSM (OpenStreetMap) road network data and LandScan population data set, and evaluates the current status of Shanghai’s 15min-CLC through the fusion of kernel density estimation, service area analysis and other statistical models and proposes relevant optimization suggestions. The results show that there are the following shortcomings: (1) From the perspective of different types of infrastructure service facilities, the spatial construction of Shanghai’s overall life service facilities and shopping service facilities needs to be optimized. (2) From the perspective of comprehensive evaluation, the comprehensive service convenience of infrastructure service facilities in the downtown area is relatively high, while the comprehensive service convenience of urban infrastructure service facilities in the suburbs and outer suburbs is relatively low; The diversity of basic service facilities in the 15min-CLC in the downtown area is more consistent with the population distribution; However, in the peripheral areas of the urban area, too many infrastructure service facilities have been constructed. Based on the above shortcomings and the perspective of supply and demand matching, relevant optimization strategies are proposed in different regions and different types of infrastructure service facilities: (1) focus on the construction of basic service facilities in the urban fringe and urban-rural areas, improve the full coverage of the basic service facilities, and appropriately reduce the number of basic service facilities in the downtown area. (2) The development of community business models can be used to promote the development of new life service facilities and shopping service facilities. (3) Improve community medical institutions through facility function conversion, merger and reconstruction, etc. (4) Optimize the hierarchical basic service facility system and improve the population supporting facilities of basic service facilities in the 15min-CLC. This paper incorporates people’s needs and concerns on the living environment into the 15min-CLC evaluation model, and uses Shanghai as an example to conduct research, summarizes the existing shortcomings, and proposes corresponding optimization strategies based on the matching of supply and demand. This article attempts to explore a replicable 15min-CLC planning model, so that it can be extended to the Yangtze River Delta urban agglomeration, to provide reference for further research on the 15min-CLC, and to promote urban construction under the concept of sustainable development.

THE MOTIVE OF LOST ILLUSIONS IN W.S. MAUGHAM’S “FOR SERVICES RENDERED” AND J. B. PRESTLEY’S “TIME AND THE CONWAYS”

The purpose of this article is to analyze the motive of lost illusions in W.S. Maugham’s “For Services Rendered” and J. B. Priestley’s “Time and the Conways”. This motive is realized, firstly, at the level of the system of characters, when two authors show characters with broken hearts, thus the idea of “a heartbreak house” becomes the dominant one in these plays. Secondly, both playwrights use a circular composition, showing the life circle of their characters. The article concludes about the genre diversity of the works of the two authors: Maugham creates a social drama (focusing on the fate of representatives of the "lost generation", the spiritual blindness of the adherents of good old England), Priestley - a philosophical "drama of time" with its characteristic semantics: the loss of time, the compression of time and its reverse flow. Besides, the article discusses a historical and literature context of post-war time: we find typological connections with Siegfried Sassoon’s poetry and Ernest Hemingway’s novel “A Farewell to Arms”.

Evaluation of the Reliability of Lifting Cranesmetal Structures

The need to search for additional methods to reduce the accident rate and to improve the safety of the crane fleet is due to the statistics of injuries and accidents at lifting structures, which rank the third after injuries and accidents in the coal and mining industries. A method for assessing the remaining life-circle, which facilitates predicting the loss of strength of a metal structure as a result of fatigue and corrosion damages considered. After analyzing the results of calculating the structure persistence, a decision is made on its further operation. If the results of calculating Q (t),with the consideration of the change in σ-1D in terms of the coefficient of variation, exceed the value of the 25 years durability, then it is inappropriate to calculate its persistence.