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Journal of Geographical Sciences 2022年第12期32卷 2599-2623页

作者： yang ren School of Geography and Planning&Land Research Center Sun Yat-Sen UniversityGuangzhou 510275China

This paper examines the process and internal mechanisms of rural ecommerce industry agglomeration and space reconstruction in metropolitan fringe areas,employing Lirendong village in Guangzhou,China,as a case *** surveys and in-depth interviews were utilized and interpreted through the perspective of the actor-network *** results show that,in Lirendong village,local government,processing enterprises,rural collectives,e-commerce entrepreneurial talent,and other key actors participate in the pursuit and realization of suburban land value according to their action *** jointly evolved and constructed the phased industrial processes and space value accumulation process of the e-commerce *** reconstruction process experienced three stages,including the government-led agricultural decentralization stage,the market-oriented industrialization stage,and the Internet+stage dominated by the social network of fellow *** development process has evolved from the dominance of exogenous forces to that of endogenous forces,and,as a result,the types and structures of rural land use are *** spatial texture and rural environment of the traditional country gradually disappeared,forming a diversified mixed form of urban-rural land and mixed-use landscape of industrial,commercial,and residential land in vertical *** the same time,the social network changed from a single and homogeneous social network of acquaintances to a multiple network of strangers.

关键词： rural revitalization spatial reconstruction actor-network Internet+ Taobao village China

Rural Development Transformation and Social Governance from the Perspective of Specialization:A Case Study of Ruiling Village in Guangzhou City,China

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Chinese Geographical Science 2023年第5期33卷 796-812页

作者： LIN Yuancheng yang ren LI Simeng School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510006China Land Research Center Sun Yat-sen UniversityGuangzhou 510275China

The reorganization of the global production network and the increased mobility of urban-rural elements have accelerated the differentiation of rural spaces,resulting in a trend towards specialization in rural *** paper focuses on the concept of specialization,and takes a renowned bonsai specialized village in Guangzhou City,China as a typical case to explore its transformation and development process,action logic and coupling mechanism with the social *** results show that:1)the development of rural specialization in Ruiling Village is shaped by several key actors,such as local governments,grassroots organizations,villagers,social organizations,policies,markets and *** transfer of these key actors and the reconstruction of actor-networks in different stages have an important influence on the transformation and realization of rural development goals.2)Through subjects-driven,organization management and resource connection,social governance supports the specialization of rural industrial organization,operation,technology and *** governance structure shifts from decentralization to networking,refinement and integration.A coupling community of social governance and specialization is created by the social governance system of‘local government-grassroots organizationseconomic cooperatives-villagers’,which links industries,industrial chains and cooperatives.3)Social governance integrates into the value chain extension process of rural specialized development with a central,multi-level organizational *** promotes the construction of the whole value chain through organizational planning,resource integration and image shaping,thus realizing the value,branding and organization of the industry,as well as the integration of rural sustainable development and governance *** governance has a profound impact on the development of rural specialization in terms of subject,structure and mode,and participates in the constructio

关键词： rural specialization rural development transformation social governance rural differentiation actor-network theory(ANT) Ruiling Village

Space diversification process and evolution mechanism of typical village in the suburbs of Guangzhou:A case study of Beicun

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Journal of Geographical Sciences 2020年第7期30卷 1155-1178页

作者： yang ren PAN Yuxin XU Qian School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510275China School of Public Administration Guangdong University of Finance&EconomicsGuangzhou 510320China

The reform of global production mode and social system accelerate the process of urbanization,and the urban-rural factors accelerate rural space *** on the space production theory and game theory,this paper analyzed the space diversification process and its influence on Beicun *** results show that:(1)In the past 30 years,the development of Beicun has experienced three stages:agricultural development,industrial development,and service industrial *** industrial structure has changed from single to *** transformation of agricultural decentralization to rural community has been realized.(2)Accompanying the rural economic development transformation,the land use type and structure of Beicun has *** spatial relationship of various types of land use was complicated and gave rise to new characteristics of mixed land for commercial and residential use,and industrial and commercial use,gradually forming a circular spatial layout structure model of public service facilities,traditional residential areas and modern residential areas,commercial areas,agricultural and industrial areas.(3)Rural space diversification was mainly due to the intervention of new industries and the transformation of leading *** endogenous land transferring mechanism and exogenous urban capital jointly promoted the industrialization process,and the market power promoted the transformation of industry into the service industry.(4)The industrialization process promoted the functional replacement of historical buildings by village *** changed the social relations of the village with the blood clan and geography oriented,and produced the occupational relation between migrant workers and urban low-income groups.(5)The multi-differentiation of suburban rural space followed the game logic of capital and land *** rural community played a key mediation in the competition for space and the game of interests among local vill

关键词： rural development space differentiation space production game theory Beicun village

Spatial Distribution Characteristics and Influencing Factors of Agricultural Specialized Villages in Guangdong Province,China

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Chinese Geographical Science 2022年第6期32卷 1013-1034页

作者： yang ren ZHANG Xin XU Qian School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510006China Land Research Center Sun Yat-sen UniversityGuangzhou 510275China School of Public Administration Guangdong University of Finance&EconomicsGuangzhou 510320China

China is vigorously implementing a rural revitalization strategy with the prosperity of rural industries as the primary *** characteristic economy of’One Village One Product’(OVOP)is particularly significant in promoting rural revitalization and increasing farmers’*** identifying the spatial distribution characteristics and influencing factors of agricultural specialized villages(ASVs)under OVOP provides a preliminary research basis for constructing the theoretical framework of specialization and clustering of rural industrial *** study takes Guangdong Province,China as an example,using kernel density estimation,Ripley’s K function,geometric fractals,principal component regression and other methods to identify the spatial distribution characteristics and influencing factors of *** was found that the ASVs in Guangdong Province are dominated by the planting industry,with an uneven number in space and a multi patch ***,ASVs are mainly distributed in the Chaoshan Plain in the eastern Guangdong,the northern mountainous area of Guangzhou,and the eastern part of Maoming *** spatial distribution mode obeys the aggregation distribution pattern at the scale of province,region and municipality(prefecture-level city).In addition,the formation and development of ASVs are affected by multiple internal and external *** influence of basic factors such as natural environmental conditions is gradually weakening,while the influence of social and economic factors such as market demand is gradually *** study can enrich the research results of ASVs and provide guidance and reference for the long-term and high-quality development of rural industry revitalization.

关键词： One Village One Product(OVOP) agricultural specialization spatial distribution rural industry revitalization

Rural vulnerability in China:Evaluation theory and spatial patterns

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Journal of Geographical Sciences 2021年第10期31卷 1507-1528页

作者： yang ren PAN Yuxin School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510275China China Regional Coordinated Development and Rural Construction Institute Sun Yat-sen UniversityGuangzhou 510275China

An indicator system is constructed and applied for comprehensive measurement of rural vulnerability in China’s *** the selection of five representative transects we explore regional differences in,and driving forces of,China’s rural *** results show that(1)The rural vulnerability of counties in China is generally within the threshold range of low to medium,and exhibits obvious spatial *** the"Bole-Taipei Line",there is a spatial pattern of north-south *** in the northeast part of the counties have low vulnerability,while those in the southwest are relatively vulnerable(2)External environmental phenomena are the leading factors that induce rural ***,the rural ecological subsystem composed of ecological exposure,ecological sensitivity,and ecological adaptation is the principal determinant of rural *** rural economic subsystem composed of economic exposure,economic sensitivity,and economic adaptation is also a core determinant of rural *** social subsystem composed of social exposure,social sensitivity,and social adaptation is also an important determinant of rural vulnerability.(3)According to the principle of adapting measures to local conditions,different regions should seek to reduce regional embeddedness and path *** should strengthen the prediction and monitoring of sources of disturbance in rural areas,and scientifically control the sensitivity of the system *** the adaptive capacity of the rural system can be improved pursuant of promoting sustainable development.

关键词： rural vulnerability rural regional system rural sustainable development rural revitalization rural geography China

Sensitivity to Stress Concentration of Steel at High Temperature

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Journal of Iron and Steel Research International 2003年第3期10卷 59-63页

作者： XIAO Feng yang ren-hui Chongqing Institute of Technology

A new experimental method was developed to simulate the generation of the surface transversal crack on the continuous casting slab with a discontinuous sample. A high temperature property of steel named"the sensitivity to the stress concentration of steel at high temperature"was defined to evaluate the effect of stress concentration on thermal plasticity of steel. "The sensitivity parameter to the stress concentration of steel at high temperature"was available to determine the temperature range in which steel is sensitive to the stress concentration.

关键词： stress concentration continuous casting surface crack high temperature property

Investigation on the electronically excited state properties of multiwalled carbon nanotube (MDDA) in solution

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Science China Chemistry 2006年第2期49卷 97-102页

作者： FENG Juan yang Zujun ren Zhenglong School of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China School of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China School of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China

Sub-microsecond time-resolved absorption spectroscopy has been used to study the electronically excited state behavior of soluble multiwalled carbon nanotube (MWNTsCON((CH2)9- CH3)2, denoted as MDDA) in chloroform, toluene and cyclohexane. Following pulsed photo-excitation of MDDA at 355 nm, three major spectral components are clearly identified with the help of global analysis carried out over 7 representative kinetics curves from 450 to 700 nm. The solvent depend-ence of decay associated difference spectra (DADS) and the corresponding lifetimes help to assign these transient species to singlet state (S1), triplet state (T1) and charge-separated state (CS), re-spectively. Preliminary discussion had been made to explore the involved photophysical and electron transfer processes.

关键词： sub-microsecond time-resolved absorption spectroscopy, MDDA, global analysis.

Two New Fossil Lacewing Species from the Middle Jurassic of Inner Mongolia,China(Neuroptera:Grammolingiidae)

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Acta Geologica Sinica(English Edition) 2011年第2期85卷 482-489页

作者： SHI Chaofan yang Qiang ren Dong College of Life Science Capital Normal University Beijing 100048 China

Two new species of lacewings are described and illustrated from the Jiulongshan Formation （Middle Jurassic） of Inner Mongolia, China： Leptolingia calonervis sp. nov. and Litholingia ptesa ***. （Grammolingiidae）. The species can be distinguished by the following features： the outermost branch of MP2 on the hind wing did not reach the margin of wing in Leptolingia calonervis sp. nov.;the second branch of Rs forked deeply while other branches of Rs forked much later in Litholingia ptesa sp. nov..

关键词： Neuroptera Grammolingiidae new species Jiulongshan Formation China

NUMERICAL SIMULATION OF UNSTEADY FLOW FOR VISCO- ELASTIC FLUID IN AN ECCENTRIC ANNULUS WITH INNER ROD RECIPROCATION

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Journal of Hydrodynamics 2008年第2期20卷 261-266页

作者： HE Feng-yun yang Shu-ren Department of Petroleum Engineering Daqing Petroleum Institute Daqing 163318 China

The equation governing the unsteady flow of viscoelastic fluids in an eccentric annulus was derived by using the common conversion Maxwell fluid constitutive equation and then discretized by the control volume method. The velocity distribution of flow field was computed by using the ADI method. The influences of the pressure gradient, eccentricity, stroke length, and stroke frequency on the velocity and flow capacity in the flow field was analyzed. The foundation for further research of the eccentric wear problem of the pumping rod in polymer-flood well was laid.

关键词： polymer-flood well viscoelastic fluid eccentric annulus unsteady flow eccentric wear

Two New Spirostanol Steroidal Sapogenins from Fermented Leaves of Agave americana

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Chinese Chemical Letters 2003年第5期14卷 491-494页

作者： Jian Ming JIN Chong ren yang State Key Laboratory of Phytochemistry and Plant Resources of West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650204

Two new spirostanol sapogenins named agavegenin A and B were isolated from the fermented leaves of Agave americana L. Their structures were elucidated as (23S, 25R)-5a- spirostan-3b, 6a, 11a, 23-tetraol (1) and (23S,... 详细信息

关键词： Agave americana L. spirostanol sapogenins agavegenin A agavegenin B.