最新刊期
卷 54 ， 期 4 ， 2024
- 摘要：The increase of urban vitality is accompanied by increasingly prominent man-made risks, and cities need to respond in a multi-dimensional resilience. The high-speed railway station area is the key space of passenger flow disturbance, but research on the disturbance characteristics and resilience response of high-speed railway station areas needs to be strengthened.Taking Xi’an North Railway Station as the research object, this paper used passenger flow disturbance index, connectivity diversity index and participatory resilience response appraisal method to analyze passenger flow disturbance characteristics resilience response mechanism and planning strategies. The results show the passenger flow disturbances have the characteristics of periodicity and spatial heterogeneity. The resilience response of high-speed railway station areas is the result of factors such as inaccurate development positioning, inefficient spatial utilization, imbalance in connectivity diversity, division of governance rights and responsibilities, and delayed mechanism response. It is suggested that the response efficiency should be improved from the aspects of paying attention to the positioning of traffic function, improving the layout and connecting space of station area, and building an efficient governance system, so as to improve the resilience of high-speed railway station area.关键词：urban resilience;passenger flow disturbance;response mechanism;Xi’an North Railway Station
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Food geography is one of the important contents of the new cultural geography research, and with the deepening of the cultural turn, the representative meaning and symbolic value of foodscape in its research content and paradigm have become more and more prominent. As a typical food consumption space, Starbucks has symbolic meanings of local culture, emotional experience and functional value. Taking 123 Starbucks in Xi’an as the research example, and using kernel density analysis, standard deviation ellipse, geographic detector and text analysis to discuss the symbol representation of the macro location and the symbol content as well as the representation meaning of micro spatial perception in the consumption space, the results show that: The cultural representation of macro location reflects three characteristics, the preference for urban vitality area is the inevitable result of the influence of food symbol communication logic and brand concept; different spatial proximity characterizes heterogeneous spatial cultural characteristics. The symbolic content of micro-symbol consumption space is divided into three parts, functional space symbol, brand symbol and the " third space" symbol, which is an important part of the consumption process meaning and identity construction.关键词：food geography;consumption space;influencing factors;symbol;representation
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：The scale and layout of industrial land in large cities have changed dramatically in the process of Chinese economic transformation since the Reform and Opening up, which has profoundly influenced the spatial pattern of cities. Taking Xi’an as an example, this study adopts a combination of quantitative and qualitative methods based on multi-source data and it is found that the area of industrial land in Xi’an showed a trend of continuous growth followed by rapid decrease from 1974 to 2019, and the spatial layout changes have significant characteristics of suburbanization and de-industrialization in urban centers in the process of park-oriented spatial aggregation. The layout pattern has changed from " group layout+ fan-shaped expansion" in the early stage of Reform and Opening up to " circle expansion+ axial expansion+ jumping agglomeration" in the increment planning period to " park-oriented spatial aggregation in the suburbs" in the inventory planning period. The main driving forces for the evolution of industrial land layout are helping enterprises to relieve their difficulties, urban growth, improvement of living and housing conditions, and economic value of land. The suburbanization and the de-industrialization in urban centers have caused many urban problems such as separation of jobs and housing, traffic congestion, which are not conducive to the healthy and sustainable development of cities.关键词：industrial land;layout evolution;dynamic mechanism;urban problems;Xi’an City
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Karst mountainous tourism destinations are typically social-ecological systems with high ecosystem service values, but there is little research on the intangible benefits they provide to the public. This study takes the Wanfenglin scenic spot in Southwest Guizhou of China as a typical case, combined with social media photo content analysis, GIS spatial analysis, geographic detector to identify and analyze the spatial differentiation and influencing factors of CES in karst mountainous tourism destinations using Amazon Rekognition image recognition technology. The results have shown that: ① Karst mountainous tourism destinations have six types of CES: aesthetics, recreation, biodiversity, local identity, cultural diversity, and educational value. ② There is a significantly and spatially positive correlation in the CES of scenic spot. The hot spots of overall CES show a multi-core distribution, mainly concentrated in the northern, central, and southern parts of the scenic spot. The covered area gradually increases from north to south, forming a gathering area for the public to perceive the karst peak forest group and Buyi minority cultural scenery. However, the cold spots are slightly concentrated in the northeast and southeast areas of the central and southern parts of the scenic spot. ③ The factors such as distance from the river system, distance from the road, elevation, and NDVI are the dominant factors affecting the overall CES; the factors such as land use type, service facility density, and village density factors are secondary factors. The multi-factor interaction of overall CES exhibits a non-linear enhancement rather than a dual factor enhancement, and natural and social dimension of interaction factors enhance the explanatory power of the spatial differentiation of overall CES. This study provides the practical reference for clarifying and enhancing the public’s understanding of the intangible benefits and social-cultural well-being of the ecosystem for karst mountainous tourism destinations.关键词：karst;mountainous tourism;ecosystem cultural services;photo content analysis;Wanfenglin
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Exploring the development of tourism economy in arid and semi-arid regions has certain reference value for guiding the sustainable and high-quality development of tourism in Ningxia, a province in the upper reaches of the Yellow River. Taking 2010, 2015 and 2019 as time sections, the study analyzed the spatio-temporal characteristics of the evolution of the tourism economic network structure in Ningxia based on the modified Gravity model and social network analysis method. The results showed that: ① Ningxia presents a network spatial pattern of regional tourism core cities radiating and driving surrounding cities, forming a diagonal triangular tourism economic network space with Yinchuan as the center and Zhongwei City, Wuzhong City, and Shizuishan City closely connected. ② The connection between regional tourism development in Ningxia has gradually evolved from unipolar to multi-level, with an increasing number of intermediary cities. The core city of Yinchuan has been continuously consolidated and developed, and intermediary cities have gradually increased from Yinchuan City to Zhongwei City and Wuzhong City. ③ The overall tourism economic connection in Ningxia is becoming increasingly close, and the connections and cooperation between various regions are constantly changing, presenting a development trend of spatial order reconstruction. Finally, this article analyzes the reasons that affect the evolution of the spatial structure of Ningxia’s tourism economy network from four aspects: geographical environment, transportation distance, resource endowment, and policy support.关键词：tourism economy;network structure;space time evolution;gravity model
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Environmental conflict is one of the main elements of resident-tourist conflict in tourism destinations, and exploring the influencing factors of environmental conflict is of great theoretical and practical significance for spatial planning and conflict resolution in tourism destinations. Taking Mount Wutai Scenic Spot as an example, this paper compares the subjective dimension of environmental conflict in the two groups of residents and tourists through a combination of grounded theory and qualitative comparative analysis, and analyzes the multiple paths that lead to multiple perceptions of the environmental conflict. The main conclusions are as follows: ① Residents and tourists perceive environmental conflicts in tourist destinations with both commonalities and differences. The commonality is expressed through the disordered management of scenic spots. The difference lies in residents focusing on tourists’ inappropriate behavior, while tourists are concerned about the limited functions of the tourist environment. ② The core conflict conditions represented by holidays, order and facilities show that the dislocation of subjective space possession and experience rights is the core element leading to the perceived environment conflict between the two groups. ③ Anomie of norm is a special factor that leads to the environmental conflict in cultural tourism destinations, and this is evident among both residents and tourists.关键词：environment conflict;resident-tourist conflict;qualitative comparative analysis;cultural tourist destination;Mount Wutai
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Travel companions are participants of tourists’ travel activities, which have an important influence on tourists’ travel experience. From the perspective of communitas, the research builds the " travel companions influence perception-tour involvement-tourist experience quality" research model based on the Drive Theory and Activity Theory and discusses the mutual influences of travel companions influence perception on tourist experience quality and the mediating effect of tourism involvement in this process through questionnaire survey and Structural Equation Model. The research finding are as follows. ① Travelers’ perceptions of the influence of travel companions can be characterized by the five dimensions of perceived emotional value, perceived functional value, perceived social value, perceived cognitive value, and perceived constraints extracted from the interview data by the grounded theory technology. ② Tourists’ perception of the emotional/functional/social/cognitive value of tourism partners has a significant positive impact on their tourism involvement and tourism experience quality. ③ Tourism involvement plays a partial mediating effect on the relationship between perceived emotional, functional, social, cognitive value and tourism experience quality. ④ The direct negative effects of perceived peer constraint on tourist involvement and quality of tourism experience, as well as the mediating effect of influencing the quality of tourism experience through tourist involvement does not pass the significance test. Finally, countermeasure suggestions are put forward in terms of product optimization, emotional marketing, and market development.关键词：companion;travel companions influence perception;tourism involvement;quality of travel experience
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 -
Research on the influence mechanism of participating in tourism on farmers’ livelihood vulnerability
摘要：The vulnerability of farmers’ livelihoods is related to the consolidation of poverty alleviation achievements and the promotion of rural revitalization strategies. Based on the theory of sustainable livelihood, 432 farmers in rural tourism destinations in Enshi Prefecture were investigated on the spot. The livelihood vulnerability of farmers with different levels of tourism participation was compared by means of T-test, variance analysis and other methods. This paper uses multiple linear regression, PSM robustness test and mediation effect test to deeply explore the impact mechanism of farmers’ participation in tourism on livelihood vulnerability. The findings are as follows: ① Participation in tourism reduces the livelihood vulnerability of farmers, especially improves the adaptability of farmers. Among the farmers with different levels of tourism participation, the livelihood vulnerability of the part-time farmers participating in tourism is the lowest, and the adaptability is the highest. ② Mechanism analysis shows that farmers’ participation in tourism enhances the endogenous development momentum such as livelihood skills and income diversification, thus reducing their livelihood vulnerability. ③ The impact of rural households’ participation in tourism on their livelihood vulnerability is heterogeneous due to different rural tourism development modes. Only rural households in villages relying on the mode of eco-agriculture significantly reduce their livelihood vulnerability through participation in tourism. The rural tourism destination of Enshi Prefecture should enhance the participation degree of rural tourism community and enhance the endogenous development power of farmers, so as to reduce the livelihood vulnerability of farmers and promote the process of rural revitalization.关键词：participation in tourism;livelihood vulnerability;livelihood skills;diversification of income;Enshi Tujia and Miao Autonomous Prefecture- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Pneumonia as a common respiratory disease, its accurate and rapid diagnosis is crucial to the health of patients. With the innovation of medical technology and the development of artificial intelligence, computer-aided diagnosis has been increasingly used in the medical field. Deep learning has achieved remarkable results in the field of pneumonia detection, but its large number of parameters and complex network structure lead to limitations such as long training time and high consumption of computational resources. To solve the above problems, a pneumonia detection method based on the variant structure of broad learning system is proposed in this paper. The method introduces the cascade pyramid structure on the basis of original broad learning system. Meanwhile, the pre-trained EfficientNet network is utilised as the front feature extractor. In addition, the incremental learning algorithms applicable to the model are proposed in this paper, including adding additional enhancement nodes, feature nodes and training samples to further optimise the model performance. Finally, comparative experiments are conducted on the publicly available dataset of chest X-rays for pneumonia. The experimental results show that the method in this paper achieves 92.83% accuracy and 98.86% AUC value, which are comparable to many deep convolutional neural networks, while the training time of the model is significantly shortened.关键词：pneumonia detection;broad learning system;cascade pyramid;incremental learning
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Long-tailed recognition is one of the most challenging problems in computer vision.Long-tailed recognition has a wide range of applications in the real world, and it is of great significance to study long-tailed recognition.For long-tailed distribution data, due to the unbalanced sample size between classes and the lack of sufficient training samples for the large tail classes, it is difficult to find a clear boundary between classes during the training process. To address this issue, we combine meta pre-training and supervised contrastive learning, and propose MBCP-BB(meta balanced contrastive pre-training and batch balance), a long-tailed recognition method based on a balanced contrastive learning strategy. MBCP-BB adopts a decoupled learning method for model training: A feature extractor with excellent feature representation ability is obtained through pre-training, and in the fine-tuning stage, the feature extractor is fixed and the classifier is retrained. This method highlights the importance of feature learning, and designs a balanced contrastive learning strategy to guide the feature learning process, so that supervised contrastive learning techniques can be effectively applied to long-tailed recognition scenarios. When performing feature learning, first reduce the samples of the head classes appropriately, and use the few-shot image generation technology to generate new samples for the tail classes; then use the class prototype of each class as supplementary samples for training. In the decoupled learning training mode, the potential of the feature extractor and classifier is fully mined, and the training process of the classifier is greatly simplified while enhancing the feature learning ability of the model. A large number of experiments are carried out on several long-tailed benchmark datasets, and compared with seven representative algorithms from multiple perspectives, the experimental results show that the proposed method is superior to the compared algorithms.关键词：long-tailed recognition;meta-learning;pre-training;supervised contrastive learning;batch balance training
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Granular computing and knowledge reduction are two important topics in knowledge discovery and data mining. Based on information granules, this paper studies the definition and method of attribute reduction for inconsistent formal decision contexts. First, a quasi-ordering relation on the object set is defined and its related properties are studied too. Then, a distribution function and a maximum distribution function are defined using the quasi-ordering classes. Moreover, a distribution reduct and a maximum distribution reduct are proposed for the inconsistent formal decision context. Finally, a (maximum) distribution discernibility matrix and the corresponding distribution discernibility functions are introduced into the inconsistent formal decision context. And the judgment theorems of the (maximum) distribution consistent set are given to calculate all the distribution reducts and the maximum distribution reducts.关键词：information granule;inconsistent formal decision context;distribution reduct;maximum distribution reduct;discernibility matrix
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：This study presents systematic analysis of zircon U-Pb-Hf isotopes, whole-rock major and trace elements, and Sr-Nd isotopes of the Jinchuan gabbros, aiming to explore its petrogenesis and geological significance. The Jinchuan gabbros has Zircon U-Pb age of 1 041.1±1.1 Ma, it has moderate SiO2 (50.26% to 51.16%), CaO (6.59% to 7.64 %), K2O (1.22% to 1.96%) contents, with high Al2O3 (16.38% to 17.15%) and TiO2 (2.61% to 2.80%) contents, belonging to low-K tholeiite rocks. These gabbros were enriched in light rare earth elements and large ionic lithophile elements (e.g., Ba, Sr), as well as depleted in heavy rare earth elements and high field strength elements (e.g., Nb, Ta, Th), with weak Eu anomalies (δEu=0.99 to 1.11).They have negative εNd(t) values (-3.61 to-2.75) and positive zircon εHf(t) (+ 1.62 to+ 7.58) contents.These geochemical features indicate the Jinchuan gabbros were originated from the enriched mantle source that metasomatized by middle Mesoproterozoic subduction fluids preserved in the lithosphere mantle. Combined with the coeval A-type granites and intra-plate basaltic magmatism, the Jinchuan gabbros formed in an intracontinental rift environment under a passive continental margin, representing the magmatic response of the Rodinia supercontinent under local extensional tectonic mechanism during the late Mesoproterozoic.关键词：western Yangtze Block;Late Mesoproterozoic;Gabbro;petrogenesis;geological implications
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：This study employed petrological, elemental and silicon isotopic geochemical studies of the cherts from the lowest Cambrian Yurtus Formation in the northwestern margin of the Tarim Basin.The genesis and sedimentary model of the cherts were discussed. Petrological observations indicate that the cherts in the middle Yurtus Formation are mostly composed of cryptocrystalline and microcrystalline quartz without clastic quartz, which excludes the influence of terrigenous input on the chert deposition.The cherts in the lower Yurtus Formation are relatively Fe-rich and have a significantly positive Eu anomaly, which suggests that the cherts were likely originated from submarine hydrothermal fluids.In contrast, the middle Yurtus Formation cherts show high Y/Ho ratio, moderate negative Ce anomaly, LREE depletion, and positive Y anomaly, indicating that the cherts were mainly sourced from seawater.This is also consistent with their δ30Si values that bias to hot water sources. In addition, the redox-sensitive element proxies indicate that the sedimentary environment of the cherts of the Yurtus Formation was probably oxidized for the surface seawater, while is anoxic or even euxinic for the bottom seawater. This study proposes that a sedimentary model for the cherts of the Yurtus Formation as follows: the cherts in the lower section were directly sourced from large amounts of silica-rich hydrothermal fluids under the influence of upwelling. Subsequently, the hydrothermal activities weakened and the redox-stratified ocean facilitated the coupled cycling of dissolved silicon and iron in seawater, and the silicon was co-deposited in the form of Fe3+ -Si colloidal. During the dominance of the euxinic zone, the iron and silicon cycle was decoupled, leading to the deposition of black shale and the formation of interbedded cherts and black shales in the middle section.关键词：Tarim Basin;Early Cambrian;Yurtus Formation;chert;sedimentary environment
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Based on the key indicators affecting the seal performance of aquifer gas storage at home and abroad, the seal evaluation system of aquifer underground hydrogen storage trap is constructed, and the evaluation method suitable for the seal performance of aquifer cover in China-analytic hierarchy process is analyzed. The static sealing capacity of Y water-bearing trap cap in an oil and gas area in East China is qualitatively analyzed by combining analytic hierarchy process (AHP) and multi-factor comprehensive evaluation method. The results show that: ① Traditional factors such as direct cap thickness and rock brittleness account for a relatively high proportion in the static seal evaluation system, followed by special factors such as formation water acidity and mineral type. ② Based on the analysis of analytic hierarchy process (AHP) and multi-factor comprehensive evaluation, it can be seen that the cap layer of Y water-bearing trap has a certain gas sealing ability under static conditions, which can seal off the hydrogen in the reservoir to a certain extent and avoid the escape of hydrogen. The research shows that the evaluation system can provide some guidance and theoretical basis for the preliminary evaluation of the sealing property of the underground hydrogen storage cover of aquifers.关键词：aquifer;hydrogen storage;cap rock sealing;analytic hierarchy process;evaluation system
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01 - 摘要：Focusing on the provenance evolution of the Yanchang Formation in the Middle and Late Triassic in the southeastern part of Ordos Basin, this paper investigates the provenance characteristics of the Yanchang Formation in the southeastern part of the basin by using detrital zircon U-Pb chronology. The results show that the U-Pb age spectra of detrital zircons from different strata of Yanchang Formation in Xufengchuan area, Hancheng are consistent, and the peak segments are mainly concentrated in the late Late Paleozoic (250~263 Ma) and late Paleoproterozoic (1 689~1 774 Ma, 1 867~1 885 Ma) and early Paleoproterozoic (2 490~2 560 Ma), the Archean ages are only scattered, while the Middle Proterozoic and Early Paleozoic ages are missing. The comprehensive provenance comparison shows that the provenance of Yanchang basin in Hancheng area mainly comes from the North China Craton and Yinshan Orogenic belt in the northeast of the basin, while the provenance characteristics of the south margin of North China Plate and the south Qinling area are not obvious. These provenance characteristics are in sharp contrast to the complex and variable provenance characteristics of the extended period in the southwest of the Ordos Basin, suggesting that the southeast of the Ordos Basin has stable northeast provenance characteristics. It is speculated that there are still deep lacustrine sediments separating the southern provenance during the extended period in the southern part of the Ordos Basin, which is of great significance for the study of the evolution of the lake basin during the extended period.关键词：Ordos Basin;Yanchang Formation;detrital zircon U-Pb geochronology;provenance characteristics
- 0
- |
- 0
- |
- 0
发布时间：2024-08-01
- Tel：029-88302822 Email：xdxbzr@nwu.edu.cn
- Technical support is provided by Beijing Founder electronics co., LTD 陕ICP备05010980号-4
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0