ANALYSIS ON THE PROBLEM AND STRATEGY OF SHARING BICYCLES IN GUANGZHOU, CHINA

With the continuous acceleration of urbanization in developing countries, the number of urban population is also increasing. In order to solve the problem of urban residents' travel, the num-ber of shared bicycles has increased. The investment of shared bicycles is a good solution to the traditional situation of urban traffic. The problems that cannot be solved under the following conditions have provided convenience for the travel of citizens. Many acute problems in the city also arise. This study analyzes the adverse effects of the existing shared bicycle management model in Guangzhou on the city. Through the development of the current situation of related shared bicycles and the re-search on governance literature, we must not let shared bicycles become the scourge of Guang-zhou City. Under the influence of policies and regulations, the transformation of the future de-velopment model of shared bicycles should be rationally guided, and the management mode of shared bicycles should be rationally optimized to make the city more orderly and standardized, and put forward reasonable suggestions

Non-trivial band topology and orbital-selective electronic nematicity in a new titanium-based kagome superconductor

Electronic nematicity that spontaneously breaks rotational symmetry has been shown as a generic phenomenon in correlated quantum systems including high-temperature superconductors and the AV3Sb5 (A = K, Rb, Cs) family with a kagome network. Identifying the driving force has been a central challenge for understanding nematicity. In iron-based superconductors, the problem is complicated because the spin, orbital and lattice degrees of freedom are intimately coupled. In vanadium-based kagome superconductors AV3Sb5, the electronic nematicity exhibits an intriguing entanglement with the charge density wave order (CDW), making understanding its origin difficult. Recently, a new family of titanium-based kagome superconductors ATi3Bi5 has been synthesized. In sharp contrast to its vanadium-based counterpart, the electronic nematicity occurs in the absence of CDW. ATi3Bi5 provides a new window to explore the mechanism of electronic nematicity and its interplay with the orbital degree of freedom. Here, we combine polarization-dependent angle-resolved photoemission spectroscopy with density functional theory to directly reveal the band topology and orbital characters of the multi-orbital RbTi3Bi5. The promising coexistence of flat bands, type-II Dirac nodal line and nontrivial Z2 topological states is identified in RbTi3Bi5. Remarkably, our study clearly unveils the orbital character change along the G-M and G-K directions, implying a strong intrinsic inter-orbital coupling in the Ti-based kagome metals, reminiscent of iron-based superconductors. Furthermore, doping-dependent measurements directly uncover the orbital-selective features in the kagome bands, which can be well explained by the d-p hybridization. The suggested d-p hybridization, in collaboration with the inter-orbital coupling, could account for the electronic nematicity in ATi3Bi5

Analysis on the Status Quo and Construction Problems of Domestic Urban Civil Air Defense Engineering System in China

As the urbanization process in developing countries continues to accelerate, although my country has achieved significant results in planning and construction, there are still many problems. For example, the rate of urban green space decreases with the continuous increase of urban buildings. Therefore, the domestic urban underground civil air defence Engineering construction is in a very important position at this stage, and our development goals must be shifted from above ground to underground. This article analyzes the general situation of the domestic civil air defence engineering system, expounds on the current situation and existing problems of my country's urban civil air defence engineering system, which has an important influence on the development of my country's cities. Functional departments must take into account the various functions of civil air defence projects and put people's safety first. At the same time, firefighters should also improve their professionalism, leadership and organizational skills, and evacuate people when encountering danger and arrange for them to take refuge in designated locations. The technicians in the relevant departments in the city need to use scientific and technological means to mix the urban network system in series and parallel so that the various structures of the urban network system are unified and interact with each other. When a disaster strikes, it can protect the safety of the people and reduce the economic loss of the city. Reduce to the lowest level to maximize benefits

A Dynamic Analysis of the Research on Community Public Space and Facilities Based on the Perspective of Bibliometrics

The outbreak of COVID-19, a major public health event at the end of 2019, made the healthy living environment a hot topic again. Community public space is the main carrier of residents' activities, while community facilities are the daily life and space of residents basic tools for interaction. Their good operation is an important line of defense for residents to live a healthy life, which gives new research directions for community construction. By using CiteSpace software and CNKI visual analysis platform, this paper conducts text mining and visual analysis of the existing literature in the international web of science and China's CNKI academic database and plots the number of published papers and the distribution of subjects in the study of "community public space and facilities". A knowledge map of frequently cited documents and research hotspots time, research topics, and research trends. To sort out the current research on community public space and facilities, and hope to provide theoretical support for further research such as the improvement of community public space and facilities, and the frontier dynamics of academic research

Analysis and Research on Spatial Nodes of Historical Villages based on Spatial Syntax Theory: Cuiwei Village in Qianshan Area of Zhuhai as an Example

This research takes Cuiwei Village located in Qianshan District of Zhuhai City as an example. The village is investigated and analyzed through field research, and the street scale, spatial structure, functional characteristics of streets, internal commercial distribution forms, and functions in the Cuiwei Historic Block are studied and analyzed. Based on the convex space analysis method and the line of sight analysis method in the space syntax theory, with the help of the Depthmap software, the complex street nodes, that is, the space of the two nodes A and B analyzed. Through the establishment of a viewshed model, including the analysis of the viewport integration degree, the viewport agglomeration degree, the viewport connection value and the spatial characteristics of the historical area, the most representative traditional buildings in the village, namely the Sanwang Temple and the Weishi Mansion, are selected. =N and when the radius R=3, observe the changes of the two parameters, the integration of the visual field and the visual depth of the two historical buildings. And with the help of Baidu time machine photos in different periods to observe and record the store's changes and people's behavioural characteristics. The results show that: at the present stage, the coordination of villages is poor, people's recognition in the village space is weak, and people cannot use local perception to reflect the overall space. There are obvious sub-interfaces between the interior of the village and the outside world—good but poor global intelligibility. After an on-the-spot investigation and analysis, it can be seen that although people can walk out of Cuiwei Village, they are always in a state of confusion, and it is difficult to grasp the spatial form of the overall area. Therefore, the space syntax analysis results are consistent with the field survey results, so this research method has good reference value and reference significance in the study of village space

Analysis and Research on Space Syntax in Urban Heritage Building: the Conservatório de Macau as an Example

Space syntax is one of the important methods for urban analysis and calculation. Based on the theory of space syntax, this study takes the Macau Conservatory of Music, an important Portuguese historical building, as an example, to first analyze the particularity of its development history in urban heritage, followed by the internal spatial structure, and import Depthmap for operation, combined with topology-related calculation methods. By analyzing the topological values such as the overall integration, local integration, global depth and selectivity of the space, we can quantitatively explore the structure of the space, understand the relationship between the overall space and the local space of the Macau Conservatory of Music, discover the deficiencies in the space structure, and propose corresponding optimization strategies are proposed to provide ideas and reference for the future renovation of the typical performing arts architectural space in the urban heritage of Macau

Research on the Plane Spatial Form of Economic Housing Based on Space Syntax Theory: Macau EDF. de Alameda da Tranquilidade as an Example

Since the reform and opening up, the city has steadily promoted the renovation of old maternity houses, towns and villages in response to the call of the state, thus promoting urban renewal, realizing urban economic development, industrial upgrading and people's livelihood improvement. The living density of economic housing is high, and the quality needs to be further optimized. However, the current urban renewal needs to improve the living quality of housing to serve the people. Therefore, when planning, constructing and renovating the interior space of public housing and meeting people's basic living conditions, people's intuitive feeling of the environment should be put first, rather than excessive attention to formal beauty—taking the EDF. de Alameda da Tranquilidade in Macau, as an example, based on the theory of space syntax, this paper conducts a convex space analysis and research on the interior space form of the first building of EDF. de Alameda da Tranqui-lidade, including the global integration degree, local integration degree (R=3,6), connectivity, intelligibility, control and Mean Depth, analyze the areas with higher integration, connection value and control value and lower areas, and make suggestions for future plane optimization, related The recommendations also apply to the second and third buildings of Yongning Plaza Building, providing better reference value and reference for relevant government departments