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Objectives: Building aggregation is one of the main contents in map generalization at the micro scale, which is of great significance to map compilation and multi-scale representation of spatial data. In order to maintain the consistency of spatial characteristics, a building aggregation method considering the spatial structure is proposed. Methods: First, based on distance-adaptive Delaunay triangles, the relationships of spatial structure between adjacent buildings are divided into six types. Meanwhile, these spatial structures are summarized as positive bridging type and oblique bridging type according to the bridging surfaces. Then, the bridging area is constructed according to bridging triangles, which are identified by projective overlap lines between adjacent buildings. The rectangular method is applied to the bridging area to maintain the spatial structure relationship. Finally, the calculation of bridging distance between adjacent buildings is put forward for building clustering, which can meet the mapping requirements and cognitive habits. Results: The effectiveness and universality of the proposed method are verified by several experiments. Conclusions: The comparative experiment shows that the proposed method has advantages in maintaining spatial structure characteristics and geometrical characteristics, including area consistency and rectangularity. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Resources Development & Market is the property of Sichuan Resource Development & Market Magazine Co., Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The properties and service life of composite materials used for space structure are affected by atomic oxygen irradiation, ultraviolet radiation and other space rays in the space environment. It′s important to prepare a composite material with space radiation resistance for the operation safety of space structure. Here, the ultra-thin prepreg with fiber mass per unit area of (35±2) g/m² was prepared by using the space radiation resistant epoxy resin as the matrix and carbon fiber (T300) as the reinforcement. The space radiation resistant composite laminates were prepared by ultra-thin prepreg, and the atomic oxygen resistance, ultraviolet radiation resistance and vacuum escape properties of the composite laminates were characterized. The results indicate that the tensile strength of 0 (°) and 90 (°) decreased by11% and 5. 5%, respectively, and mass loss less than 0. 35% after exposure under atomic oxygen (5×1020 atoms/cm²). After UV exposure (3000 ESH), the tensile strength of 0 (°) loss 1. 6%. However, the tensile strength of 90 (°) increased from 65. 9 to 75. 3 MPa. In addition, the Total Mass Loss (TML) and Collected Volatile Condensable Materials (CVCM) of the composite from outgassing in a vacuum environment for 24 h are less than 1% and 0. 1%, respectively(the material is placed at 125 ℃, less than 7×10−3 Pa). The carbon fiber reinforced composites prepared in this paper have excellent resistance to space radiation and can be used as candidate composite materials for largescale space structures. [ABSTRACT FROM AUTHOR]

The cross-border mergers and acquisitions (M&A) of digital cultural enterprises have formed a "reticular space" between countries (regions) regarding advanced production factors such as capital, technology, and knowledge, and have an important impact on reshaping the economic geographic configuration of the world. Based on this, this paper used complex network methods and GIS spatial technology to explore the structure of global cross-border M&A network of digital cultural enterprises and its evolution law. The results show that: ① The crossborder M&A network of digital cultural enterprises is gradually evolving from a "dual-core" pattern dominated by North America and Western Europe to a "three-pole" pattern dominated by North America, Western Europe, and Asia-Pacific; ② The polarization caused by economic globalization has induced the phenomenon of "rich club" in the cross-border M&A network of digital cultural enterprises, and the centralization of the cross-border M&A network of global digital cultural enterprises has been deepening; ③ The refinement of the division of global labor system of digital cultural enterprises and the deepening of regional economic grouping and integration have enhanced the M&A preference and contact level between neighboring countries (regions); ④ The cross-border M&A network of digital cultural enterprises is characterized by a "core-periphery" structure. Among them, North America and Western Europe always occupy the core of the network; while Africa, Latin America, and Central Asia and West Asia are located at the edge of the network and are in a state of being "harvested". [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Vibration, Measurement & Diagnosis is the property of Nanjing Hangkong Daxue and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Forecasting trends in sustainable sustainability levels in metropolitan areas serves as the foundation for developing development policies that are tailored to local conditions. Sustainability evaluation studies based on a multidimensional comprehensive index system fall short of highlighting the variability, systemic, and dynamic nature of metropolitan area development. To better understand the role of multidimensional scenarios in guiding the sustainable development of metropolitan areas, a greater emphasis on suburban spatial units and spatial heterogeneity characteristics is required. Methods: We simulate the trends of sustainable development levels of 16 municipal districts in Beijing, China from 2011 to 2030 by combining the system dynamics model and the shared socioeconomic pathways, and thus condense the metropolitan area's sustainable development model and compare the advantages and shortcomings of each development scenario under different models. Results: The findings show that: (1) Beijing's municipal districts perform differently in economic, social, and environmental subsystems, and there are three types of typical districts: Synergistic development, ecologically biased development, and economic constraint. (2) Shared socioeconomic pathway (SSP) 1 is the most desirable urban sustainable development scenario among the four scenarios of SSP1, SSP2 (BAU (business-as-usual)), SSP3, and SSP5. (3) In order to achieve the transition from the historical trajectory to the SSP1 scenario, each district type should pursue a distinct development strategy. To improve the quality of coordinated development, synergistic development type zones should use social security and employment expenditures to compensate for the shortcomings of social development. Ecologically biased zones should reduce energy consumption and increase environmental protection investment to maintain environmental advantages, and economic constraint type zones can maintain high gross domestic product growth rates in the short term to get out of the development dilemma. Conclusions: The findings of this paper highlight the complex cause-and-effect relationships between urban economic, social, and environmental systems and offer a framework for system evaluation and simulation technology for the sustainable development of metropolitan areas. This framework will serve as a source of regulations and a foundation for management of urban refinement. [ABSTRACT FROM AUTHOR]

To analyze the community characteristics of tropical monsoon forests with different succession stages, four different plant communities named A, B, C, and D were investigated in this study, respectively, in a typical monsoon forest of Ehuangzhang in Yangchun, Guangdong Province. The species composition, biodiversity and spatial structure were analyzed, their maturity levels' differences were detemined, succession direction was predicted, and suggestions for optimization were put forward. The results were as follows: (1) The forest layers of the four communities were single. Small diameter at breast height (DBH) class trees and lower forest dominated these communities, owning 1-3 obvious dominant species. (2) The Shannon-Wiener index ranged from 2.72 to 3.74, Simpson index from 0.90 to 0.97, and Pielou evenness index from 0.74 to 0.89, suggesting that their diversity characteristics were significant differences. (3) Their dominance ranged from 0.49 to 0.51, uniform angle from 0.56 to 0.61, mingling from 0.54 to 0.83, forest spatial structure index from 60.57 to 71.44, forest spatial structure distance from 53.15 to 68.53. (4) The analysis of community basic characteristics, diversity characteristics and spatial structural characteristics indicated that the maturity levels in all community ranked D > A > C > B. In conclusion, four communities are currently in the pre- or mid-term succession stages and the development space of DBH and tree height is large. The four communities are in the moderate growth state. All trees show a slight aggregated distribution, and the tree species are moderately, strongly or very strongly mingling. Besides, there is a distance in spatial structure between four communities and ideal forest with the development of maturity levels. The four communities continue to succession with intolerant tree species as the main dominant tree species, and gradually and preliminarily have the typical vegetation characteristics of the district forest climax community. With the development of maturity levels, the four communities' biodiversity and mingling will increase, the spatial structure will be optimized and the stability will be enhanced. The results of this study provide scientific basis for community construction mechanism and forest structure optimization. In the future, Ehuangzhang tropical monsoon forests should be more regulated and protected, while the ecology of vegetation and biodiversity conservation in the area should be widely monitored and studied in depth. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Fuzhou University is the property of Journal of Fuzhou University, Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to optimize the spatial pattern of mountainous settlements and reasonably plan national land space, and further promote the process of rural revitalization, the spatial structure characteristics of mountainous settlements were regarded as one of the important research objects. The mountainous settlements in the upper reaches of the Min River were taken as the research object. Based on the principle of urban order scale, aggregation dimension and correlation dimension methods, the spatial structure characteristics of administrative and geometric centers of settlements in the upper reaches of the Min River were analyzed and compared, and the reasons for the errors were summarized. Results show that the structural characteristics of the first distributed urban system in the upper reaches of the Min River are obvious. the cumulative percentage curve of the county population is consistent with the characteristics of rank-scale. The fractal characteristics of the spatial structure of settlements in the upper reaches of the Min River are significant. Due to the significant influence of the economy, settlements gather and distribute in space, gradually decreasing towards the surrounding areas centered around the top cities and towns. The correlation dimension and the ratio of cattle to crows in the upper reaches of the Min River reveal the characteristics of urban interaction intensity and traffic accessibility, which are consistent with the actual situation. The error caused by the administrative center is closely related to the average altitude of the research area, and its deviation from the geometric center is relatively large in areas with high average altitude. The impact of its deviation on the research results should be taken seriously. [ABSTRACT FROM AUTHOR]

Copyright of Electronic Communication & Computer Science is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on big data for rail passenger transportation, this paper explores the spatial linkages among three major urban agglomerations of the Yangtze River Economic Belt, Including the Yangtze River Delta,the Middle Reaches of the Yangtze River City Agglomeration and the Chengdu-Chongqing City Agglomeration, as well as their spatial structural heterogeneity, from the intra- and extra-group perspectives. The results show that: ① The three major city ag‐ glomerations have stronger in-group links than out-group. There are predominantly intra-provincial links in both the Yangtze River Delta and the Middle Reaches of the Yangtze River City Agglomeration. The Chengdu-Chongqing city agglomeration has stronger inter-provincial links than intra-provincial links. However, the intensity of inter-provincial links within the three city agglomerations is much higher than that outside the agglomerations, implying that under the ef‐ fect of the mechanism of internal agglomeration, cities within the city agglomerations are more likely to break through the provincial boundaries to create links and realize the integrated development of the region. ② The intensity of intra-cluster and extra-cluster linkages of large city clusters reaches its highest at inter-city distances of 0-100 km and 0-300 km, respectively. And the intensity of in-group and out-group links between cities in the Yangtze River Delta and the Middle Reaches of the Yangtze River city agglomerations follow the law of distance decay, but in the Chengdu-Chongqing city agglomeration, only the out-group linkage conforms to this law. ③ Megacities dominate the in-group and out-group links of the three major urban agglomerations. In the in-group and out-group links, the urban connection intensity of the three major urban agglomerations at the same level is proportional to the city size, while the cross-level urban connection intensity is inversely proportional to the series difference. ④ The spatial structures of the Yangtze River Delta and the Middle Reaches of the Yangtze River City Agglomeration are polycentric, though the extra-cluster linkages have a reinforcing effect on the polycentric structure of the former. The Chengdu-Chongqing City Agglomeration has a "single-core" form in the view of intra-group linkage, and a "double-core" structure in the view of extra-group linkage and total linkage, indicating that the extra-group linkage is pushing the Chengdu-Chongqing City Agglomeration to change from a "single-center" to a "double-center" structure. [ABSTRACT FROM AUTHOR]

Copyright of New Architecture is the property of New Architecture Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of South Architecture / Nanfang Jianzhu is the property of South Architecture Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Construction Technology is the property of Railway Construction Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To explore the interaction between the spatial structure of different types of natural forest stands and the diversity of woody plants. The fixed monitoring sample plots of Pinus massoniana, Cunninghamia lanceolata, and Fagus lucida three types natural forests were established in the Xingdoushan Nature Reserve, in accordance with the CTFS plot standards. The differences in spatial structure and woody plant diversity among different types of forests were analyzed through sample plots investigation. The impact of forest spatial structure indicators on woody plant diversity was tested by Pearson correlation analysis. The results showed that:there is no significant difference of the three stands mingling and uniform angle index. There is a certain difference in the dominance of size differentiation between the forests of Cunninghamia lanceolata and Fagus lucida, but all three stands form a mixed, clustered, and competitive growth state. The species composition of woody plants in various stands is rich. The Shannon Weiner index, Simpson index and species number of the tree layer in the Cunninghamia lanceolata forest are the highest, but there is no significant difference between the three types of natural forests(P>0.05), and the Pielou index value in the Fagus lucida forest is the highest, and there was no significant difference(P>0.05) among different forest types. The Shannon Weiner index and Simpson index values of the shrub layer in the natural forest of Pinus massoniana are the highest, and the Shannon Weiner index of the shrub layer in the forest of Fagus lucida is significantly lower than the forest of Pinus massoniana(P<0.05). The Simpson index value is also significantly lower than the forest of Pinus massoniana and Cunninghamia lanceolata(P<0.05), but Pielou index of the Fagus lucida forest is significantly higher than that in the other two stands(P<0.05), and the number of species is significantly higher than the forest of Cunninghamia lanceolata(P<0.05). There are certain differences in the impact of spatial structure indicators on the diversity of woody plants in different forest, mingling is the dominant influencing factor, and the stronger the mingling, the higher the species diversity. It is recommended to appropriately supplement certain artificial intervention measures to improve the forest structure, enhance biodiversity, and fully utilize the forest value and various ecological service functions. [ABSTRACT FROM AUTHOR]

Objective In order to improve the yield of tert-butylphenyl diphenyl phosphate(BPDP) synthesized by one-pot method, alkyl imidazole hydrogen sulfate ionic liquids with different spatial structures and electronic groups were used as catalysts. Methods This study compared the effects of N-alkyl imidazole hydrogen sulfate ionic liquids with different carbon chains and alkyl imidazole hydrogen sulfate ionic liquids with different electronic groups on the yield of BPDP synthesis, and further investigated the effects of catalyst dosage and catalyst circulation on the yield. Results When the side chain structure of the catalyst is ethyl, the yield of BPDP is the highest. Electron-absorbing groups can increase the yield of BPDP, while electron-donating groups can reduce the yield of BPDP. The yield of BPDP is the highest when the catalyst dosage is 1.5 w% of 4-tert butylphenol. The catalyst still has high catalytic activity after 6 cycles of useage. Conclusions The spatial structure and electronic groups of ionic liquid catalysts have a significant effect on the yield of BPDP. When 1-ethyl-2-fluoro-imidazole hydrogen sulfate ionic liquid is used as the catalyst, the yield of BPDP can increase to 85.3 w%, thereby economic benefits can be improved. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Xinyang Normal University Natural Science Edition is the property of Journal of Xinyang Normal University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Arid Land Geography is the property of Chinese Academy of Sciences, Xinjiang Institute of Ecology & Geography and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Architectural Journal / Jian Zhu Xue Bao is the property of Architectural Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The strategic position of the Beibu Gulf urban agglomeration has become increasingly prominent in terms of national economic development. In this paper, we propose the life cycle theory of urban agglomerations from the perspective of tourism-economic linkages and study the evolution of tourism-economic linkages and the spatial structure of emerging urban agglomerations in the Beibu Gulf using a modified gravity model and social network analysis. The results show the following: 1) The tourism-economic connection of the Beibu Gulf urban agglomeration was initially limited to neighboring cities dominated by provincial capital cities. Nanning is the main location for developing the tourism economy. With improvements in traffic and the implementation of national policies, tourism-economic ties among urban agglomerations have gradually deepened, with the total number of these connections increasing from 174.84 to 6, 542.94 in 2019. The total number of connections in 2019 was 37.42 times that of 2011. The tourism-economic connection structure developed from a loose to a multicore network structure. 2) The density of the tourism-economic connection network in the Beibu Gulf urban agglomeration increased by 6.01 times. The network structure changed from loosely to relatively closely connected, and the degree of tourism economic connections has continuously improved. Moreover, the scope of the core area of the tourism economy continues to expand. The internal network density of the core area increased to 0.833 in 2019, and the links between the core areas continue to strengthen. Although the network density in the fringe area has increased, the internal tourism-economic connection remains weak. 3) The spatial structure of the Beibu Gulf urban agglomeration has evolved from a single center in Nanning to a network-type spatial structure of three centers, seven nodes, and five edges. Nanning, Zhanjiang, and Haikou are important tourism centers and growth poles. The centrality of urban agglomerations has changed from severe polarization and disparity in development status between cities to a more balanced development trend. Among the cities under the jurisdiction of Hainan, except for Haikou, the development of the tourism economy is relatively slow. 4) The Beibu Gulf urban agglomeration entered its growth stage after its embryonic development. However, its development still faces three obstacles: administrative barriers, low competitiveness of tourism products, and unobstructed tourism flow, and it remains far from becoming a mature urban agglomeration. This paper proposes an optimized development mechanism for the Beibu Gulf urban agglomeration of government promotion, transportation linkage, and industrial interaction that is conducive to the high-quality development of the Beibu Gulf urban agglomeration. In conclusion, the main content of this study can compensate for the lack of research on the spatial structure of tourism-economic linkages in emerging urban agglomerations to a certain extent and provide a reference for the development of urban agglomerations in the embryonic and growth stages. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Public center systems planning is of great significance in controlling and guiding the optimization of urban spatial structures, activating the efficiency of urban operations, and improving the quality of urban spaces and human living environments. However, most previous studies used a single data source and focused on identifying the physical space characteristics centered on traditional commercial and public service facilities, making it difficult to accurately measure the actual operational performance of public centers. Therefore, this study relied on multiple data sources to research Dongguan City in South China from multiple perspectives. The formation of Dongguan's central system was affected by two factors: the external force of the megacity region and the endogenous driving force of urban development. First, qualitative and quantitative calibration methods were used to identify the spatial patterns of public centers from the spatial morphological dimension in an allround and all-temporal manner using Kernel Density Estimation (K) and the Getis-Ord G* i statistical method. Second, the functional hierarchy and service hinterland of centers at all levels were identified using the dynamic human activity links of the recreational population. Third, the effectiveness of planning implementation was evaluated from the perspective of spatial morphology and functional connection. Finally, starting from the factors of policy system, foreign investment, industrial economy, land factors, and transportation facilities, this study explored the formation mechanism of the center in a targeted manner, trying to provide a reference for the benign development of similar manufacturing cities. The results showed that: 1) the technical method using multisource data such as POI, cell phone signaling, and Baidu building footprint and traditional land use data to identify the public center system was effective, accurate, and practical. Dongguan had initially formed a center system with dual spatial characteristics of "morphological polycentric" and "functional monocentric"; 2) the plan had a certain role in promoting the construction of the center system. However, the development in terms of morphology and function was somewhat different from the plan; 3) the center system resulted from a multiparty game between the government and the market power. Thus, the center system depended on government policy formulation, land allocation, and facility construction and was closely related to capital investment and industrial transfer. Dongguan's urban public center system was important and highly correlated with the city's degree of industrial development. Therefore, this study included modern productive service elements in the center identification elements for the first time while focusing on extending the research object to the functional network of the Pearl River Delta megacity region, using the regional dynamic spatial movement trajectory of human flow to identify the distribution of urban center systems, and comprehensively defining the elements and technical methods of urban public center system identification, in an attempt to provide a reference for similar manufacturing cities. [ABSTRACT FROM AUTHOR]

The historical experience of urbanization and urban agglomeration development shows that the new urbanization strategy of “relying on urban agglomeration” is the inevitable choice to realize Chinese modernization. The connotation of Chinese modernization also puts forward new requirements for high-quality urbanization. Starting from the “urbanization of people” and moving towards the new journey of building a modern country, we must meet the development demand and stage requirements of the spatial structure of urban agglomerations, construct the urban scale system scientifically with new development concepts, improve the spatial distribution of population, and set a new pattern of regional economic development. Based on the characteristics of Chinese modernization proposed at the 20th National Congress of CPC, this paper discusses the internal requirements of Chinese new urbanization, analyzes the existing problems of urban development so far, so as to explore the future development path. Accurately grasping the development pattern of urban agglomeration and urban in China, scientifically designing the scale system and improving the spatial distribution with new development concepts are conducive to the realization of a “human-centered” new type of urbanization. In this way, we will open up a new realm of Chinese-style modernization with the feature of populous development, common prosperity, harmony between material and spiritual civilization, harmonious coexistence between man and nature, and peaceful development. In the process of urbanization at the present stage, problems such as extensive urban sprawl, scale system imbalance, inferior spatial form and radical construction should be solved dynamically. That is, spatial layout should be optimized in the process of coordinated development, the allocation of resource should be optimized in the process of scale growth, and common prosperity should be realized in the process of urban and rural integration. Based on the spatial structure and scale system of urban agglomerations, it is necessary to sort out the formation mechanism of urban agglomerations in order to design the development path of Chinese-style high-quality urbanization. This includes the spatial differentiation mechanism of urban agglomeration size and function, the spatial characteristics and mechanism of monocentric and multicentric structures, the polarization and trickle action of the largest city, and the formation and optimization mechanism of urban spatial network. In order to explain the spatial dispersion of economic activities and the development model of polycentric cities, this paper calculates the spatial compactness and polycentric degree of 333 cities based on the geographic information system Arcgis 9.2, which shows that the reduction of compactness is the inevitable result of urban scale expansion and extensive sprawl. The multi-center development mode is the way to change the bad shape of city and achieve high quality development. From the perspective of new development pattern, Chinese new urbanization requires the optimization of spatial structure and hierarchical system of all cities, so as to form a functional layout of urban agglomeration with coordinated economic development, mutually complementary functions, reasonable division of labor in industries, and optimal spatial efficiency. Further promoting the new Chinese-style urban development model, improving the structure of city clusters and steadily raising the quality of urbanization will provide solid support for comprehensively building a modern socialist country. On this basis, this paper proposes to rely on urban agglomeration to integrate resources and give play to scale effect and trickle effect. Coordinate the division of labor of large, medium and small cities within the group to achieve a reasonable and efficient spatial structure of urban agglomeration. Besides, recommendations such as improving the management system and mechanism of urban agglomerations and coordinating the interests of all parties, promoting rural revitalization, focusing on the integrated development of urban and rural industries to achieve common prosperity are made in this paper. [ABSTRACT FROM AUTHOR]

This research paper delves into the important study field of predicting the cruise tourism market in the context of tourism science decision-making. The paper introduces the gravity model, which incorporates migration restrictions and cruise line correction factors to the supply-demand relationship of cruise tourism, to discover the spatial pattern and developmental law of China's cruise tourism market from 2011-2019. Utilizing the competitive state model, the paper proposes graded development strategies for the tourist markets of different cruise home ports. Research findings include: (1) China's domestic tourist source market presents regional differences primarily along the "Hu line", with significant eastward and near-domain oriented characteristics; (2) neighboring ports demonstrate homogeneity within their tourist source structures, such as the similarities in tourist market structure between Shanghai port and Wuhan port; (3) Sanya Port's cruise passenger source market highlights the significant specificity of long-distance tourists, contradicting the spatial distance attenuation law observed in the attraction of other ports. With the application of the gravity model, this study expands the depth of cruise tourism market research, providing a practical reference for passenger market development and postCOVID-19 cruise market recovery. [ABSTRACT FROM AUTHOR]

Copyright of Arid Land Geography is the property of Chinese Academy of Sciences, Xinjiang Institute of Ecology & Geography and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

贵阳奥林匹克体育中心（二期）主体育馆屋盖为超大跨度肋环型弦支穹顶结构，净跨度为117 m，屋顶最大高度为42 m，下部共布置5圈索杆体系，其临时支撑体系的布置是影响结构张拉成型状态及施工安全的重要因素。对弦支穹顶结构的临时支撑体系布置方案进行对比研究，综合对比其整体结构成型状态、成型位形的坐标偏差、成型态索力偏差及其他因素，最终采用3圈分散支撑胎架的方案，并与施工实测数据进行对比，其施工完成态位形与设计初始态位形吻合，进一步验证了方案的合理性，可为类似的工程提供参考。

By enhancing the electron mobility of materials, the conductivity of materials can be improved, the process of redox reaction in the catalytic process can be accelerated, and the catalytic activity can be greatly improved. Therefore, the preparation of high electron mobility catalytic materials has become a research hotspot. Although lots of studies have recognized the importance of enhancing the electron mobility of catalytic materials for catalytic performance, the current research is still insufficient, especially the lack of unified understanding of the internal mechanism of how the electron mobility of solid catalysts affects the catalytic performance of materials. It is urgent to reveal the structure-activity relationship between electron mobility and catalytic materials to realize the controllable preparation of catalytic materials. Herein, we have systematically summarized the different preparation methods, chemical and physical mechanisms, characteristic analysis, and challenges of high electron transfer catalytic materials and looks forward to the future development direction. Additionally, the influences and limitations of the element characteristics, electrical conductivity, and spatial characteristics of the materials on the preparation of high electron migration catalytic materials are highlighted. [ABSTRACT FROM AUTHOR]

Copyright of Arid Land Geography is the property of Chinese Academy of Sciences, Xinjiang Institute of Ecology & Geography and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Central China Normal University is the property of Huazhong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The spatial structure of tourist origins in tourist destinations is the basic study of tourism geography. Most of the existing studies focus on the spatial distribution of tourist origins in a single destination, but fail to summarize the differences in the spatial structure of tourist source market in different types of destinations. Based on resource location, this study proposed a new explanatory framework for the spatial structure of tourist source markets of tourist destinations, and verified the rationality and scientificity of the new explanatory framework for the spatial structure of tourist source markets of different types of tourist destinations by using online tourism reviews. The results show that: (1) Resources and location conditions are the important factors that affect the spatial structure of the tourist source market. (2) With the improvement of resource uniqueness and location advantage, the distribution of tourist source markets is gradually dispersed, and the geographical concentration index of tourist source market space of various tourist destinations is increasingly similar. The core market of ordinary tourist destinations (Changshu and Jiaozuo) extends to about 800km, while the core market of unique tourist destinations extends to more than 1250km. (3) Location determines the speed of distance attenuation of destination, and the attraction of tourism resources affects the form. The research contribution of this paper lies in clarifying the differences in spatial structure of tourist source markets in five different types, and revising the classical theory of distance attenuation of tourist source markets. [ABSTRACT FROM AUTHOR]

Urban invisible consumption space is a physical consumption space with weak visibility in urban public space, which has become a new channel for urban business and consumption development. It is progressively becoming an important part of the urban business. Analyzing the spatial pattern and influencing factors of urban invisible consumption is an important basis for promoting online and offline commercial development in cities. Taking Changsha City as an example, the invisible consumption space of the city was identified using POI and business information data of Gaode open platform. Using the Gatiss-Ord index and the geographically weighted regression model, we analyzed the spatial distribution of the urban invisible consumption with different levels of Internet participation. The results show that: 1) the main consumption type of invisible consumption space in Changsha is experiential service consumption; 2) the invisible consumption space infiltrated by the Internet, with Wuyi Square and Red Star Business Circle as the main core areas, presents a structural form of "a main core area, an auxiliary core area, strip distribution, and a point-like mixture"; 3) compared with the traditional invisible consumption space, which is less influenced by the Internet, the invisible consumption space infiltrated by the Internet has clear spatial heterogeneity and less spatial autocorrelation. The results show that the urban invisible consumption space tends to cluster in areas with a mature business atmosphere, convenient transportation, high cost-effective rent, and close to residential areas. The spatial distribution of invisible consumption in Changsha presents a basic spatial structure in line with the central place theory, showing a polycentric form of agglomeration and diffusion. Urban invisible consumption space clusters in the local industrial and commercial center. Moreover, the evolution of places shows a trend of infiltration and aggregation to blocks and the location influence is weak, but it is not "no location influence at all". Its distribution characteristics are in line with the theory of flowing space on the scale of urban internal block. However, invisible consumption space use is positively influenced by the Internet, and its potential commercial value lies in promoting and making full use of the existing urban space resources. In addition, for an "online famous city", the offline consumption activities in the network platform are increasing in abundance, and invisible consumption space will become a more important place to perceive the hidden vitality of the city. [ABSTRACT FROM AUTHOR]

Against the backdrop of digital technology integration and digital transformation, the digital economy has become an important new economic development in China. The digital economy changes and subverts the traditional production and organization modes of industries, breaks regional and spatial barriers, and realizes a highly interconnected network structure. Therefore, it is critical to study the digital economy from a network analysis perspective. In previous studies, the interlocking network model and the headquarters-branch model have been adopted to construct enterprise networks; however, the networks based on these models have some deficiencies in comprehensiveness and authenticity. An enterprise equity network built based on the investment relationships between enterprises can reflect the actual contact network status of the enterprise. Based on the above background, this study analyzed the evolutionary characteristics of the digital economy network in the Yangtze River Delta area through an enterprise equity network and explored its influencing factors and mechanisms. First, we constructed the digital economy networks of the Yangtze River Delta area for 2010, 2015, and 2020 using equity investment data between enterprises and a directed correlation network model. Second, with the indicators of degree centrality, degree centralization, an investment source, and others, the spatial and temporal evolution characteristics of digital economy networks were described from two aspects: network patterns and investment relationships. Furthermore, this study explored the possible factors affecting digital economy networks in the Yangtze River Delta area through a Quadratic Assignment Procedure. This study has three main findings: 1) From 2010 to 2020, various types of digital economy networks in the Yangtze River Delta area showed the characteristics of hierarchical diffusion and node agglomeration. Each industry forms an expansion of the network framework around the core node in the initial stage and then expands to the surrounding areas through secondary nodes. Shanghai and Hangzhou were the most important network nodes in the digital economy. 2) The number of net inflow areas for digital economy investment in the Yangtze River Delta was increasing, whereas the number of net outflow areas was decreasing. Hangzhou was the main net inflow city, while Shanghai and Ningbo were the main net outflow cities. Simultaneously, the source of investment in research units has changed from inside the province to outside, and there are clear interprovincial differences. 3) Cognitive proximity, the difference in the number of digital economy enterprises, the difference in the proportion of secondary industries, the difference in information facilities, and the early network foundation all have significant positive effects on the establishment of digital economy networks. System proximity, the difference in the proportion of tertiary industries, the time difference in the establishment of digital economy enterprises, and the gap in innovation ability restrict the formation and development of digital economy networks. Geographical distance is no longer the main factor influencing the formation of digital economic networks. Based on the above conclusions, this study proposes some suggestions for promoting the development of the digital economy from the perspectives of industrial agglomeration, facility and policy allocation, and path dependence. [ABSTRACT FROM AUTHOR]

China has pledged to peak its carbon emissions before 2030 and achieve carbon neutrality before 2060. New energy decarbonization will be a major focus area for achieving the 'dual carbon' goals since it accounts for about 20 percent of China' s total energy consumption. The Xiong' an New Area' s geographical advantages and natural endowments have brought abundant wind and solar energy resources and have huge development potential in the field of new energy development. This paper summarizes the Xiong' an New Area' s resource endowment and achievements in developing new energy, and comprehensively analyzes the opportunities and challenges faced by this area in the process of building a national new energy demonstration zone in the context of achieving the 'dual carbon' goals. It sorts out the new energy development policy of the Xiong' an New Area and its history of new energy development and then points out that the current development of new energy in this area lies in power project construction, power grid construction, green energy consumption, energy storage development, and new energy equipment. This study believes that the Xiong' an New Area will experience three development stages of carbon neutrality: initial carbon neutrality, fluctuating carbon neutrality, and stable carbon neutrality, because this area has carried out green power planning simultaneously in the initial construction stage and has more green power supply. With the expansion of population and economic scale, the rapid increase in energy demand would lead to the decline in green power supply ratio, causing carbon neutrality to fluctuate and change over time. With the population and economic structure in a stable development stage, the proportion of high-value-added and high-tech industries would increase, and energy utilization technologies such as green electricity would make progress, resulting in the arrival of the stable carbon neutrality development stage. On the other hand, from the perspective of carbon sink potential corresponding to carbon sources, the planned proportion of the blue-green space and the construction land in the Xiong' an New Area would keep its carbon sink capacity in a relatively stable state for a long period of time. Therefore, in addition to the value-added of the natural carbon sink system, carbon capture, utilization and storage technologies and other means of artificial carbon sink can be used as adjustment tools under the carbon neutrality system. [ABSTRACT FROM AUTHOR]

Taking the central urban area of Guiyang,a mountainous city,as an example,the average nearest neighbor,kernel density analysis,standard deviation ellipse method,spatial autocorrelation analysis and grid dimension method are used to identify the spatial structure of its medical points and explore the impact mechanism. The results show that:①The spatial distribution of medical treatment points in the central city of Guiyang is in a significant cluster mode. The nuclear density of medical treatment points is characterized by "four cores,sub-center and multipoint surround",showing the "y" layout. The overall medical treatment points are in the trend of "northwest-southeast" direction. ②The number of medical treatment points of the unit population in the township community (street) is positively correlated with each other. The distribution structure of cold hot spots around the ring line is prominent. ③The medical treatment points in the central city of Guiyang have the characteristics of uneven spatial distribution and complex fractal structure. ④The spatial distribution of regional medical points is affected by the pattern of population distribution,road grade and accessibility, house price and GDP, altitude and slope. [ABSTRACT FROM AUTHOR]

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Zhejiang University (Science Edition) is the property of Journal of Zhejiang University (Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Since the launch of the Rural Revitalization Strategy, China's rural construction in county seats and villages has made remarkable achievements. Meanwhile, towns have received insufficient attention as a traditionally important node connecting urban and rural areas. Based on historical literature and the most recent survey of Yangxi and Wengyuan counties in Guangdong Province, this study examines how the relationship between county, town, and village changes over time as the functions of towns change. Data from field investigations and villagers' questionnaires obtained from the evaluation of rural construction by the Ministry of Housing and Urban-Rural Construction in 2021 regarding the two case towns were employed. This study analyzes the function and role of towns in the county-town-village system and further discusses the transformation of the spatial pattern of county-town-village in two case counties. The town has been transformed into a comprehensive functional service space, providing basic services such as daily shopping, preschool education, compulsory education, and basic medical care, and has regained its importance in connecting urban and rural areas in the "hierarchical and open network" spatial structure of county-town-village. As a service center radiating through the entire county, the county seat plays an essential central role in satisfying the rural population with higher-quality modern services in addition to basic services and offering non-routine service functions such as access to medical care and house purchases. According to the differentiated functions of different scales and the contextual geographic conditions in the two case towns, the pattern of county-town-village has diverted into two different spatial structures: the classic "central place" hierarchical and the county-central one. Geographical conditions still matter; in plain areas, transportation links between counties, towns, and villages are more convenient. Therefore, the service needs of villagers are the major influencing factor while they choose where to go. Moreover, a county seat with a stronger comprehensive service capacity is preferred, and the spatial pattern has higher centrality. In hilly areas, topographic barriers, and inconvenient transportation limits public service options. Fewer villagers choose to go directly to county seats owing to the inconvenience, instead, town as a medium space has attracted some village residents. Thus, the spatial pattern of hilly areas is less central and more in the "central place" hierarchical structure. In summary, this study brings town, as a research unit, back to researchers' attention, and demonstrates the shifting roles of towns in the new era. In addition to pursuing the full coverage of facilities, to achieve the rational allocation of resources in the construction of town seats, the study suggests that the demand scale and service threshold of different types of functions should be considered. Meanwhile, the county should be viewed as an inclusive unit that can coordinate the allocation of resources to towns according to their basic conditions. Based on a complete configuration of necessary facilities, towns near urbanized areas can make full use of the radiation capacity of the county or city and reduce the construction of overly urbanized facilities; in areas where transportation within the county is less convenient, the service level of towns needs to be further improved. [ABSTRACT FROM AUTHOR]

Copyright of New Architecture is the property of New Architecture Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

空间结构的主振型遴选准确与否直接影响着振型叠加法的计算效率。以现有阈值法的基本假定作为切入点，揭示了动力功和静力功均为外力功的本质，指出采用常幅阶跃荷载作为外部激励存在局限性，且现有理论框架的基本假定与实际偏差较大，据此论证了该方法在理论上的不完备性；通过理论推导，将阈值法拓展至与实际地震动输入更具关联性的简谐激励情形，能够同时考虑动力响应和静力响应，避免了不合理的基本假定，并且详细论述了在具有实际意义的共振情况下阈值法的适用性，据此提出了拓展阈值法。算例分析表明，拓展阈值法能够将计算误差控制在10%以内，主振型阶数相比于规范法得到的阶数平均减少了73.8%，相比于现有阈值法得到的阶数平均减少了56.5%，计算稳定且高效。

Copyright of Refractories / Naihuo Cailiao is the property of Naihuo Cailia (Refractories) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The Dehesa ecosystem provides important social and economic values across the Iberian Peninsula. Assessing the temporal dynamics of this system under climate change is important for the maintenance and conservation of these highly valuable ecosystems. Here, we present the baseline data of an observational plot network in the Dehesa that will form the foundation for monitoring long-term dynamics and for experimental manipulations testing the mechanisms driving resilience within the Dehesa. The initial surveys indicate that the forest structure is typical for the Dehesa, which suggests it is an exemplary site for examining temporal dynamics of this ecosystem. We present these initial data to encourage collaborations from international scientists via either direct experimental projects or meta-analyses. [ABSTRACT FROM AUTHOR]

With the worldwide rise of cultural and creative industries, the cultural functions of cities and global cultural cities have become a new perspective in the research on urban net‐ works. Drawing on the commercial performances data collected from the "DAMAI. NET" plat‐ form, this paper first presented a comprehensive analysis of the geographical pattern of cultural performances consumption in Chinese cities, the spatial structure of the urban network generated by touring performances, and the divergences between the urban networks created by different types of cultural performances. It further used the method of Ridge Regression to identify the major socio-economic factors that shape the geographical patterns of the urban networks created by cultural performances consumption activities. The outcomes reveal that: (1) Cultural performances consumption in China demonstrates both dispersive and concentrative patterns. Whereas the distribution of performances exhibits a wide geographical coverage, most of them are highly concentrated in a few top-tier cities, especially those in the eastern coastal area. (2) The urban network of touring performance displays a typical "diamond structure". However, there is an evident trend of penetration of touring performances towards the second- and third-tier cities, which reflect the divergences between different cities in their capability of local cultural production and the increasing marginal revenue of cultural performances. (3) The influence of the central and western provincial capitals in the touring-performance urban network has seen a significant in‐ crease, whereas the positions of the core cities in eastern coastal areas have to some extent declined, indicating the discrepant developmental status of performance market in different regions and the varying functions played by these cities in connecting their respective regions with the national cultural consumption market. (4) Different types of cultural performances also display rather disparate patterns of spatial distribution and urban network structure, which reflect their different market structures and profit models, as well as the impact of local urban cultural consumption characteristics. (5) The level of cultural and educational development, the investment of local government, the overall level of economic development and consumption, and the degree of openness are important factors that shape the pattern of the network of touring performances in China, which highlights the specialties of cultural performance consumption. [ABSTRACT FROM AUTHOR]

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Geography & Geographic Information Science is the property of Geography & Geo-Information Science Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Central China Normal University is the property of Huazhong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Central China Normal University is the property of Huazhong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)