检索结果-南通市图书馆

The Mechanism Behind Urban Population Growth and Shrinkage from the Perspective of Urban Network Externalities

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2023年第2期33卷 189-204页

作者： ZHOU Ying zheng wensheng WANG Xiaofang XIONG Yajun WANG Xuzheng College of Urban and Environment Science Central China Normal UniversityWuhan 430079China Wuhan Branch of China Tourism Academy Wuhan 430079China Hubei High-quality Development Institute Central China Normal UniversityWuhan 430079China

Urban shrinkage is a global phenomenon,and it will coexist with urban growth for many *** the same time,the network connection between cities continuously improved due to the construction of the transportation and information ***,the relationship between urban network externalities and urban population growth/shrinkage remains ***,based on high-speed railway(HSR)flow data,a spatial econometric model is used to explore the mechanism behind urban population growth and shrinkage from the perspective of network externalities in *** results indicate that:1)the urban network experiences a certain clubbing *** cities that are strongly connected are concentrated along China’s main railway lines and the southeastern coastal areas,while shrinking cities that are weakly connected are distributed at the periphery of the network.2)Moreover,the network externality disregards spatial distance and together with the agglomeration externality influences the growth and shrinking of cities.3)Urban economic development still promotes the development of Chinese ***,the improvement of the urban economy has a negative cross-regional spillover effect on neighboring cities due to urban competition.4)Lastly,Local spillovers of urban network externalities are positive,while cross-regional ones are ***,the government needs to promote the construction of multi-dimensional network connections between cities to promote cities’sustainable *** study reveals the relationship between urban network externalities and urban development,enriches the theories of network externalities and urban growth/shrinkage,and provides a reference for regional coordinated development.

关键词： urban growth/shrinkage urban networks network externality high-speed railway(HSR) China

Measuring Network Configuration of the Yangtze River Middle Reaches Urban Agglomeration:Based on Modified Radiation Model

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2020年第4期30卷 677-694页

作者： zheng wensheng KUANG Aiping WANG Xiaofang CHEN Jing Key Laboratory for Geographical Process Analysis&Simulation of Hubei Province Central China Normal UniversityWuhan 430079China Academy of Wuhan Metropolitan Area Hubei Development and Reform Commission&Central China Normal UniversityWuhan 430079China Hubei Institute of Economic and Social Development Central China Normal UniversityWuhan 430079China Wuhan Branch of China Tourism Academy Central China Normal UniversityWuhan 430079China

The objective of this study is to develop a framework for re-examining and re-defining the classical concepts of spatial interaction and reorganization in the urban *** introduce a modified radiation model for spatial interactions,coupled with migration big data,transport accessibility algorithm,and city competitiveness assessment for efficient distribution of the inter-city flow through the *** Yangtze River Middle Reaches(YRMR)urban agglomeration(UA)is chosen as the case study region to systematically identify and measure its spatial configuration and to gain insights for other UAs‘sustainable development in *** results are also compared with those computed by the classical gravity model to systematically discuss the applicability of spatial interaction laws and models,and related practical policies for regional sustainable development are discussed based on the findings as *** conclusions are highlighted below:1)Combining with the?city network paradigm‘and?central place theory‘can better express the spatial configurations of city systems in the context of?space of flows‘;2)The results validate the potentialities of a multi-analysis framework to assess the spatial configurations of city network based on the improved radiation model and network analysis tools;3)The applications of spatial interaction models should be considered according to the specific geographical entity and its spatial scale.

关键词： spatial interaction city network radiation model gravity model urban agglomeration

The physiological role of the unfolded protein response in the nervous system

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第11期19卷 2411-2420页

作者： Shuangchan Wu wensheng Lin Department of Neuroscience University of MinnesotaMinneapolisMNUSA Institute for Translational Neuroscience University of MinnesotaMinneapolisMNUSA

The unfolded protein response(UPR)is a cellular stress response pathway activated when the endoplasmic reticulum,a crucial organelle for protein folding and modification,encounters an accumulation of unfolded or misfolded *** UPR aims to restore endoplasmic reticulum homeostasis by enhancing protein folding capacity,reducing protein biosynthesis,and promoting protein *** also plays a pivotal role in coordinating signaling cascades to determine cell fate and function in response to endoplasmic reticulum *** research has highlighted the significance of the UPR not only in maintaining endoplasmic reticulum homeostasis but also in influencing various physiological processes in the nervous ***,we provide an overview of recent findings that underscore the UPR’s involvement in preserving the function and viability of neuronal and myelinating cells under physiological conditions,and highlight the critical role of the UPR in brain development,memory storage,retinal cone development,myelination,and maintenance of myelin thickness.

关键词： myelin neuron oligodendrocyte Schwann cell unfolded protein response

在线全文

学校读者我要写书评

暂无评论

华北驼绒藜修复退化草地的案例

草原与草业 2024年第2期36卷 59-62页

作者：乌亚汗冯彩霞郑文胜金净包海龙阿拉塔锡林郭勒盟镶黄旗草原工作站新宝拉格013250 蒙草生态环境(集团)股份有限公司草原生态系统研究院呼和浩特010030

草原生态系统在陆地生态系统中占有举足轻重的地位,特别是在水土保持、发挥固碳潜力、保持生态稳定等方面起到了积极作用。近年来,人为活动加剧导致的草地生态环境破坏等问题凸显,各地区意识到该问题后也在积极采取措施进行草原生态修... 详细信息

草原生态系统在陆地生态系统中占有举足轻重的地位,特别是在水土保持、发挥固碳潜力、保持生态稳定等方面起到了积极作用。近年来,人为活动加剧导致的草地生态环境破坏等问题凸显,各地区意识到该问题后也在积极采取措施进行草原生态修复与治理工作,目前也取得了一些可观的成绩,但仍然存在一些不足之处,需要进一步改善和优化。草原生态修复与治理工作的开展,要结合实际情况采取针对性的修复技术手段。在草原生态修复中应因地制宜,不同地区、草原类型需要采取不同的修复措施。该文分析了内蒙古锡林郭勒盟镶黄旗的草原退化原因,并且提出了合理的修复方式。“锡林郭勒型”华北驼绒藜因具有抗旱、抗寒等特点,在该地区修复过程中具有显著成效,可在该地区广泛推广。

关键词：退化草地 “锡林郭勒型”华北驼绒藜补播

Spatio-temporal variability of surface chlorophyll a in the Yellow Sea and the East China Sea based on reconstructions of satellite data of 2001-2020

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2024年第2期42卷 390-407页

作者： Weichen XIE Tao WANG wensheng JIANG Key Laboratory of Marine Environment and Ecology Ocean University of ChinaQingdao 266100China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China

Chlorophyll-a(Chl-a)concentration is a primary indicator for marine environmental *** spatio-temporal variations of sea surface Chl-a concentration in the Yellow Sea(YS)and the East China Sea(ECS)in 2001-2020 were investigated by reconstructing the MODIS Level 3 products with the data interpolation empirical orthogonal function(DINEOF)*** reconstructed results by interpolating the combined MODIS daily+8-day datasets were found better than those merely by interpolating daily or 8-day ***-a concentration in the YS and the ECS reached its maximum in spring,with blooms occurring,decreased in summer and autumn,and increased in late autumn and early *** performing empirical orthogonal function(EOF)decomposition of the reconstructed data fields and correlation analysis with several potential environmental factors,we found that the sea surface temperature(SST)plays a significant role in the seasonal variation of Chl a,especially during spring and *** increase of SST in spring and the upper-layer nutrients mixed up during the last winter might favor the occurrence of spring *** high sea surface temperature(SST)throughout the summer would strengthen the vertical stratification and prevent nutrients supply from deep water,resulting in low surface Chl-a *** sea surface Chl-a concentration in the YS was found decreased significantly from 2012 to 2020,which was possibly related to the Pacific Decadal Oscillation(PDO).

关键词： chlorophyll a(Chl a) data interpolation empirical orthogonal function(DINEOF) empirical orthogonal function(EOF)analysis Yellow Sea East China Sea

Evolution Process of Urban Spatial Pattern in Hubei Province Based on DMSP/OLS Nighttime Light Data

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2016年第3期26卷 366-376页

作者： zheng wensheng RUN Jiying ZHUO Rongrong JIANG Yupei WANG Xiaofang Key Laboratory for Geographical Process Analysis & Simulation Hubei Province Central China Normal University Wuhan 430079 China Academy of Wuhan Metropolitan Area Hubei Development and Reform Commission & Central China Normal University Wuhan 430079 China Chongqing Geomatics Center Chongqing 401121 China

This paper intends to investigate the urban spatial patterns of Hubei Province and its evolution from three different perspectives: urban nodes, urban connections and urban clusters. The research adopts nighttime light imagery of cities in Hubei Province, the viewpoint of ′point-axis-area′ in the ′point-axis system′ theory, and employs light index model, gravity model and social network analysis. The findings are as follows: 1) In terms of urban nodes, the urbanization process of Hubei has been carried out mainly on the basis of external expansion rather than internal increasing. The polarization trend of urban connection network is strengthening. 2) As for urban connections, the estimation of urban connections using light index model is capable of containing various actual flow, and the connections are getting increasingly closer. 3) In regard to urban groups, seven urban groups of varying sizes have formed. On that basis, three stable and relatively independent urban groups as the centers, namely Wuchang, Yichang and Xiangyang emerge as well. But the structures of ′Wuhan Metropolitan Area′, ′Yichang-Jingzhou-Jingmen City Group′ and ′Xiangyang-Shiyen-Suizhou City Group′, which are defined by local development strategy in Hubei Province, are different from the above three urban groups.

关键词： Defence Meteorological Satellite Program′s Operational Linescan System(DMSP/OLS) urban spatial pattern point-axis-area Hubei Province China

Asymmetric dark matter and Sommerfeld enhancement

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第8期76卷 118-123页

作者： Sujuan Qiu Hoernisa Iminniyaz wensheng Huo School of Physics Science and Technology Xinjiang UniversityUrumqi 830017China

We study the relic density of asymmetric dark matter with long-range interactions by considering the Sommerfeld effect. We find that the annihilation cross section of asymmetric dark matter is enhanced by the Sommerfeld effect and thus the relic density is decreased. Then we use the Planck data to constrain the asymmetry factor, coupling, and to derive the upper bounds on the dark matter mass in s-wave and p-wave annihilation cases.

关键词： asymmetric dark matter relic density Sommerfeld enhancement

Asymmetrically coordinated main group atomic In-S_(1)N_(3)interface sites for promoting electrochemical CO_(2)reduction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 5011-5021页

作者： Yan Gao Jinlong Ge Jingqiao Zhang Ting Cao Zhiyi Sun wensheng Yan Yu Wang Jie Lin Wenxing Chen zheng Liu Anhui Provincial Engineering Laboratory of Silicon-based Materials Bengbu UniversityBengbu 233030China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China SEPA Key Laboratory of Eco-Industry Chinese Research Academy of Environmental SciencesBeijing 100012China Ningbo Institute of Materials Technology and Engineering Chinese Academy of ScienceNingbo 315201China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Shanghai Synchrotron Radiation Facilities Shanghai Institute of Applied PhysicsChinese Academy of ScienceShanghai 201204China

Designing catalysts with highly active,selectivity,and stability for electrocatalytic CO_(2)to formate is currently a severe ***,we developed an electronic structure engineering on carbon nano frameworks embedded with nitrogen and sulfur asymmetrically dual-coordinated indium active sites toward the efficient electrocatalytic CO_(2)reduction *** expected,atomically dispersed In-based catalysts with In-S_(1)N_(3)atomic interface with asymmetrically coordinated exhibited high efficiency for CO_(2)reduction reaction(CO_(2)RR)to *** achieved a maximum Faradaic efficiency(FE)of 94.3%towards formate generation at−0.8 V *** hydrogen electrode(RHE),outperforming that of catalysts with In-S2N2 and In-N4 atomic *** at a potential of−1.10 V ***,In-S_(1)N_(3)achieves an impressive Faradaic efficiency of 93.7%in flow *** catalytic performance of In-S_(1)N_(3)sites was confirmed to be enhanced through in-situ X-ray absorption near-edge structure(XANES)measurements under electrochemical *** discovery provides the guidance for performance regulation of main group metal catalysts toward CO_(2)RR at atomic scale.

关键词： indium single-site catalyst main group metal asymmetrical coordination CO_(2)reduction reaction structure-activity relationship

Mechanism of internal thermal runaway propagation in blade batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第2期89卷 184-194,I0005页

作者： Xuning Feng Fangshu Zhang wensheng Huang Yong Peng Chengshan Xu Minggao Ouyang School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China

Blade batteries are extensively used in electric vehicles,but unavoidable thermal runaway is an inherent threat to their safe *** study experimentally investigated the mechanism underlying thermal runaway propagation within a blade battery by using a nail to trigger thermal runaway and thermocouples to track its propagation inside a *** results showed that the internal thermal runaway could propagate for up to 272 s,which is comparable to that of a traditional battery *** velocity of the thermal runaway propagation fluctuated between 1 and 8 mm s^(-1),depending on both the electrolyte content and high-temperature gas *** the early stages of thermal runaway,the electrolyte participated in the reaction,which intensified the thermal runaway and accelerated its *** the battery temperature increased,the electrolyte evaporated,which attenuated the acceleration *** diffusion affected thermal runaway propagation through both heat transfer and mass *** experimental results indicated that gas diffusion accelerated the velocity of thermal runaway propagation by 36.84%.We used a 1D mathematical model and confirmed that convective heat transfer induced by gas diffusion increased the velocity of thermal runaway propagation by 5.46%-17.06%.Finally,the temperature rate curve was analyzed,and a three-stage mechanism for internal thermal runaway propagation was *** Stage I,convective heat transfer from electrolyte evaporation locally increased the temperature to 100℃.In Stage II,solid heat transfer locally increases the temperature to trigger thermal *** StageⅢ,thermal runaway sharply increases the local *** proposed mechanism sheds light on the internal thermal runaway propagation of blade batteries and offers valuable insights into safety considerations for future design.

关键词： Lithium-ion battery Blade battery Thermal runaway Internal thermal runaway propagation