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Impact of the Regional Comprehensive Economic Partnership(RCEP)implementation on agricultural sector in regional countries:A global value chain perspective

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Journal of Integrative Agriculture 2025年第1期24卷 380-397页

作者： Shaowen Xu Jingfei Qian Yangfen Chen Huijie Zhang institute of Agricultural Economics and development Chinese Academy of Agricultural SciencesBeijing 100081China Agricultural Information institute Chinese Academy of Agricultural SciencesBeijing 100081China

The Regional Comprehensive Economic Partnership(RCEP)has created favorable conditions for building deeply integrated agricultural value chains(AVC)in *** on the RCEP agreement,this study employed the global trade analysis project(GTAP)model to evaluate the impact of RCEP on AVC of member countries in terms of time,tariff reduction,and reduction of non-tariff barriers(NTB).The results indicate that(1)the implementation of RCEP boosts the value-added to agricultural exports for most member countries,particularly in competitive industries;(2)the increase in domestic production and processing capacity,reflected in domestic value-added(DVA),is the primary factor driving the rise in the value-added of agricultural exports across various industries of member countries;(3)RCEP enhances the participation of most regional countries in AVC,with varying impacts on AVC positioning,thereby fostering regional AvC development;and(4)RCEP has a positive effect on AVC indicators both in the short and long term,with the effect becoming more pronounced over ***,reducing NTB enhances the positive effects of tariff reductions on AVC *** on the analyses,the following recommendations are proposed:(1)Leverage the development opportunities arising from RCEP implementation to enhance the agricultural DVA;(2)capitalize on cooperative opportunities created by RCEP to build cohesive regional AVC;and(3)prioritize the effective implementation of RCEP'shigh-qualityrules.

关键词： RCEP GTAP agricultural value chains tariff non-tariff barriers trade facilitation

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Hydrothermal Control by Deep Hidden Faults on Geothermal Systems in Sedimentary Basins:A Case Study of the Cangdong Fault in the North China Basin

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Acta Geologica Sinica(English Edition) 2025年第1期99卷 243-257页

作者： YIN Xiaoxiao LIN Jianwang LI Hu LI Huanqing DONG Lufei YAN Jiaxian ZHANG Sen LI Zheng Tianjin Geothermal Exploration and development Design institute Tianjin 300250China Observation and research Station of Tianjin Low-Medium Temperature Geothermal Resources Ministry of Natural ResourcesTianjin 300250China Technology Innovation Base for Geothermal Resource development and Utilization Tianjin 300250China Tianjin Municipal Bureau of Planning and Natural Resources Tianjin 300042China

Large basins are currently the global focus for geothermal development,with their hydrothermal system being controlled by a variety of factors,such as basement relief and fracture *** is located at the north of the Cangxian uplift in the North China Basin,the concentrated geothermal resource development zone in North *** study systematically collects temperature logging data and long-term dynamic monitoring of water level and water quality as well as group well tracer test data carried out in this area in recent years,on the basis of which the hydrothermal controlling role of the deep hidden faults is systematically *** results show that the Cangdong fault communicates with different geothermal reservoirs in the shallow part and plays a specific role in the water-heat channel of the local *** a result,the high-value area of the geothermal temperature gradient in the sedimentary layer of the Donglihu area is distributed around the Cangdong *** geothermal reservoir temperature of the Minghuazhen Formation within the influence of the fault is also significantly higher than the regional average,the hydraulic head of different geothermal reservoirs showing a consistent and synergistic ***,the water quality has been stable for many years without any apparent *** understanding has a particular significance for further deepening understanding of the geothermal genesis mechanism in sedimentary basins and guiding future geothermal exploration and development in the Donglihu area.

关键词： sedimentary basin geothermal system hidden fault hydrothermal channel Cangdong fault

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Factors affecting smallholder farmers' adaptive capacity to climate change:A comparative study of Nepal, India, and Bangladesh

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Journal of Geographical Sciences 2025年第2期35卷 359-381页

作者： CHAPAGAIN Prem Sagar BANSKOTA Tibendra Raj SHRESTHA Shobha ZHANG Yili YAN Jianzhong RAI Suresh Chand ISLAM Md Nurul LIU Linshan MANDAL Umesh Kumar PAUDEL Basanta KHANAL Narendra Raj THASINEKU Om Chandra Central Department of Geography Tribhuvan University institute of Geographic Sciences and Natural Resources research CAS College of Resource and Environment Southwest University Department of Geography Delhi School of Economics University of Delhi Department of Geography & Environment Jahangirnagar University research Center for Educational Innovation and development (CERID) Tribhuvan University

Agriculture, significantly impacted by climate change and climate variability, serves as the primary livelihood for smallholder farmers in South Asia. This study aims to examine and evaluate the factors influencing smallholder farmers' adaptive capacity(AC) in addressing these risks through surveys from 633 households across Nepal, India, and Bangladesh. The findings reveal that AC is influenced by various indicators categorized under eight principal factors. The first three factors, which explain about one-third of the variance in each country,include distinct significant indicators for each nation: in Nepal, these indicators are landholding size, skill-development training, knowledge of improved seed varieties, number of income sources, access to markets, and access to financial institutions; in India, they encompass access to agricultural-input information, knowledge of seed varieties, access to markets, access to crop insurance, changing the sowing/harvesting times of crops, and access to financial services; in Bangladesh, the key factors are access to financial institutions, community cooperation, changing the sowing/harvesting times of crops, knowledge of improved seed varieties,and access to agricultural-input information. Notably, indicators such as trust in weather information, changing sowing/harvesting times of crops, and crop insurance were identified as important determinants of AC, which have been overlooked in previous studies.

关键词： adaptive capacity Bangladesh climate change India Nepal PCA rain-fed agriculture smallholder

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A cationic radical lanthanide organic tetrahedron with remarkable coordination enhanced radical stability

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Chinese Chemical Letters 2025年第2期36卷 568-573页

作者： Zhengzhong Zhu Shaojun Hu Zhi Liu Lipeng Zhou Chongbin Tian Qingfu Sun State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences University of the Chinese Academy of Sciences

Rare–earth supramolecular compounds, such as lanthanide organic polyhedrons（LOPs）, are of particular interest due to their many possible applications in various fields. Here we report the first syntheses of Ln4(L·+)4–type(Ln, lanthanides; L·+, radical ligand) radical–bridged lanthanide organic tetrahedrons by self–assembly of face–capping triphenylamine（TPA）–cored radical ligand with different lanthanide *** coordination enhanced radical stability has been observed, with half–life times(t1/2) for L1·+,La4(L1·+)4, Eu4(L1·+)4, Gd4(L1·+)4, Tb4(L1·+)4and Lu4(L1·+)4estimated to be 53 min, 482 min, 624 min,1248 min, 822 min and 347 min, respectively. The TPA radical in Ln4(L1·+)4containing paramagnetic Ln ions（Ln = EuⅢ, GdⅢand TbⅢ） is observed to be more stable than that in Ln4(L1·+)4（Ln = LaⅢand LuⅢ）constructed by diamagnetic Ln ions. This difference in radical stability is possibly due to the magnetic interactions between paramagnetic LnⅢions and L1·+ligands, as confirmed by electron paramagnetic resonance（EPR） in La4（L）4(L = L1and L1·+) and Tb4（L）4(L = L1and L1·+), and magnetic susceptibility measurements in Tb·4（L）4(L = L1and L1·+). Our study reveals the coordination of radical ligands with lanthanide ions can improve the radical stability, which is crucial for their applications.

关键词： Enhanced stability Lanthanide organic polyhedrons Radical Self–assembly Supramolecular chemistry

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Stakeholder Roles and Relations in Forest Management around the Boumba-Bek National Park, South East Cameroon

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Open Journal of Forestry 2025年第1期15卷 1-22页

作者： Roseline Gusua Caspa Jean Guy Ndje Mbile Severine Etounou Gwendoline Naah Nyambi Priscilla Ijang Tata Chimene Mfoumou Hirai Masaaki institute of Agricultural research for development (IRAD) Yaound Cameroon The Center for African Studies Kyoto University Yoshida-Shimoadachi-cho Sakyo-ku Japan

This study, which took place around the Boumba-Bek National Park (BBNP) in Cameroon, was based on identifying and characterizing stakeholders in forest resources management, as well as determining the relationships between them, with the goal of encouraging collaborative forest resources management. Purposive sampling was adopted, in which focus group discussions, key informant interviews, semi-structured interviews, and snowball sampling were used for data collection. Focus group discussions were conducted with a total of 20 local associations involved in forest and wildlife management, Bantu traditional councils and the Baka community. Key informant interviews were conducted with local and international NGOs, forest exploitation and Sport hunting (Safari) enterprises and local public administrations that had working rapports with village communities around the BBNP. Information was generally sought on the role of stakeholders in forest management, in terms of use, protection, policy enforcement, challenges encountered in their activities and their relationships with other stakeholders. Actor linkage matrix was used to establish the relationships between different stakeholders. The identified stakeholder groups included the local community, State, international and local NGOs, economic operators (forest exploitation and sport hunting enterprises), and also the rules guiding their activities. Conflicts were rife between the community and the other stakeholders with regard to resource accessibility and use, whereas intra-community conflicts mostly resulted from cases of corruption and embezzlement linked to benefits sharing. Cases of collaboration among all the stakeholders were mostly related to anti-poaching patrols and setting of forest concession limits. There is a need to bring all stakeholders on the same platform, such as in a consultation workshop, to get their perceptions on building trust, conflict resolution and genuine collaboration in resources managemen

关键词： Stakeholder Participation Conflict Collaboration Stakeholder Interaction Sustainable Forest Resources Management

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General Automatic Solution Generation for Social Problems

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Machine Intelligence research 2025年第1期22卷 145-159页

作者： Tong Niu Haoyu Huang Yu Du Weihao Zhang Luping Shi Rong Zhao Center for Brain-Inspired Computing research(CBICR) Optical Memory National Engineering Research Centerand Department of Precision InstrumentTsinghua UniversityBeijing100084China IDG/McGovern institute for Brain research Tsinghua UniversityBeijing100084China THU-CET HIK Joint research Center for Brain-Inspired Computing Beijing100084China

Given the escalating intricacy and multifaceted nature of contemporary social systems,manually generating solutions to address pertinent social issues has become a formidable *** response to this challenge,the rapid development of artificial intelligence has spurred the exploration of computational methodologies aimed at automatically generating ***,current methods for the auto-generation of solutions mainly concentrate on local social regulations that pertain to specific ***,we report an automatic social operating system(ASOS)designed for general social solution generation built upon agent-based models that enables both global and local analyses and regulations of social problems across spatial and temporal *** adopts a hypergraph with extensible social semantics for a comprehensive and structured representation of social *** also incorporates a generalized protocol for standardized hypergraph operations and a symbolic hybrid framework that delivers interpretable solutions,yielding a balance between regulatory efficacy and functional *** demonstrate the effectiveness of the ASOS,we apply it to the domain of averting extreme events within international oil futures *** generating a new trading role supplemented by new mechanisms,ASOS can adeptly discern precarious market conditions and make front-running interventions for nonprofit *** study demonstrated that ASOS provides an efficient and systematic approach for generating solutions for enhancing our society.

关键词： General automatic generation global-local regulation hypergraph social representation symbolic hybrid scheme generalized operation protocol

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Thoughts on the Inheritance and development of Farming Culture of the Rice Whole Industry Chain in the Yangtze River Economic Belt

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Asian Agricultural research 2025年第2期17卷 1-10,16页

作者： Min ZHANG Juncheng ZHU Li GAO Bin HU Dongjing LI research Center of Beidou+Industrial development of Key research institute of Humanities and Social Sciences of Hubei Province Hubei University of Science and TechnologyXianning 437100China

The Yangtze River Economic Belt is the birthplace of the world s rice farming culture,and is the origin of common rice(Oryza sativa L.),wild rice(Oryza Rufipogon Griff.),medicinal rice(Oryza officinalis *** ***),and wart-grain rice(Oryza granate Nees et *** Hook.f.).Rice culture is the main theme of agricultural culture in this economic belt and an outstanding representative of excellent traditional Chinese *** study provides an overview of the history of rice cultivation in the belt from the prehistory,post-history and modern *** studies the agricultural cultural heritage resources of the whole rice industry chain from the biological genetic resources,world cultural heritage,key cultural relics protection units,national archaeological site parks,movable cultural relics,important agricultural cultural heritage,intangible cultural heritage,China time-honored brands,historical names,traditional markers,tribute culture,archival and documentary *** also analyzes the six main problems in the inheritance and development of rice farming culture,and proposes 8 strategies,including promoting the inheritance and innovative development of excellent traditional Chinese culture through the inheritance of rice farming culture,promoting the Exploration of the Origins of Chinese Civilization Project through rice farming culture,and creating the Yangtze River National Cultural Park with rice farming culture as the main theme.

关键词： Yangtze River Economic Belt Rice(Oryza sativa L.) Whole industry chain Rice cultivation culture Agricultural culture Inheritance and development

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Effect of acid fracturing fluid modifying coal microstructure stimulated by ultrasonic

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International Journal of Mining Science and Technology 2025年第2期35卷 275-293页

作者： Shaojie Zuo Rui Gan Zhijie Wen Liang Zhang Zhizhong Jiang Fuping Zhao Chengwei Liu Kun Li Zhiyuan Xu College of Mining Guizhou UniversityGuiyang 550025China Shandong Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China School of Emergency Management Xihua UniversityChengdu 610039China Guizhou research institute of Oil&Gas Exploration and development Engineering Guiyang 550022China Liupanshui Normal University Liupanshui 553000China

The combination of ultrasonic and acid fracturing fluid can strengthen the modification effect on the micropore structure of the coal matrix,thereby enhancing the efficiency of the acid fracturing *** this research,acetic acid was utilized to formulate acid fracturing fluids with varying concentrations,and the evolutionary traits of both the acid fracturing fluids and ultrasonic waves in relation to coal samples were *** functional group structure,mineral composition,micropore structure and surface morphology of coal samples were characterized by FTIR,XRD,N_(2)adsorption at low temperature and *** results showed that aromatics(I)and branching parameters(CH_(2)/CH_(3))were reduced by 81.58%and 88.67%,respectively,after 9%acetic acid *** acid can dissolve carbonates and clay minerals in coal,create new pores,and increase porosity,pore volume and pore fractal *** modification by 7%acetic acid,the pore volume increased by 5.7 *** observation shows that the diameter of coal surface holes increases,EDS scanning shows that the content of mineral elements in coal decreases,the connectivity of coal holes increases,and the holes *** findings of this research offer theoretical direction for optimizing ultrasonic-enhanced acid fracturing fluid modification.

关键词： Acidic fracturing fluid Ultrasonic Coalbed methane Microstructure

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Molecular dynamics simulation:The key to reveal the enrichment mechanisms of helium

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Science China Earth Sciences 2025年第2期68卷 643-645页

作者： Wenhui LIU Department of Geology Northwest UniversityXi’an 710069China Petroleum Exploration and Production research institute SINOPECBeijing 102206China

In recent years,helium and its enrichment mechanisms have been the frontier and attractive research in the field of geological resources(Liu et al.,2024).In the earliest geosciences,noble gases and their isotopes,including helium,were used as tracers for geochronology and geological processes due to their chemical inertness and *** attention has been paid to the isotope composition in geological bodies.

关键词： attractive frontier gases

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In-situ liquid-phase transmission electron microscopy for two-dimensional energy materials

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Science China Chemistry 2025年第2期68卷 414-429页

作者： Junyu Zhang Liangping Xiao Mi Lu School of Materials Science and Engineering Xiamen University of TechnologyXiamen 361024China Instrumental Analysis Center Laboratory and Equipment Management DepartmentHuaqiao UniversityXiamen 361021China Department of Physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional MaterialsJiujiang Research InstituteXiamen UniversityXiamen 361005China

Two-dimensional(2D)materials are vital for the development of advanced materials in the next-generation energy conversion and storage ***-situ liquid-phase transmission electron microscopy(LP-TEM)acts as a powerful tool for characterizing the dynamic evolution of materials under work condition in real time and in ***,this mini-review highlights the considerable advances in the utilization of in-situ LP-TEM for studying the physical and chemical process dynamics of 2D materials,such as their nucleation growth and phase *** electrocatalytic water splitting reactions and CO_(2) electroreduction of 2D energy materials are *** underlying electrochemical reaction mechanisms of the 2D electrode materials in rechargeable batteries are discussed and ***,the current challenges and perspectives for future research are *** min-review aims to inspire and stimulate further innovation and encourage the broader adoption of LP-TEM in exploring the fascinating dynamics of 2D energy materials.

关键词： two-dimensional(2D)materials liquid-phase transmission electron microscopy electrochemical reaction electrode materials

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