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evolution mechanism and treatment timing of penetrating fissures

Journal of Mountain Science 2024年第10期21卷 3453-3473页

作者： ZHANG Yanjun YAN Yueguan ZHU Yuanhao DAI Huayang College of Geoscience and Surveying Engineering China University of Mining and Technology-BeijingBeijing 100083China

The Inner Mongolia mining area in western China are characterized by the development of numerous penetrating fissures,resulting in severe land *** is significant to reveal the underlying evolution mechanism and identify treatment timing for restoring the ecological *** Guanbanwusu mining subsidence area in Inner Mongolia,China was selected as the research case for this *** evolution mechanism of different penetrating fissures was revealed by field measurement,physical simulation and theoretical *** treatment timing prediction model for the mining subsidence area was established based on the enhanced Weibull time *** results show that the ground fissures are mainly step-type and collapse-type *** breaking form of overlying strata determines their vertical opening and horizontal *** high mining intensity in the western mining area results in a shortened period of dynamic fissure expansion and reduced closure *** damage extent of the overlying strata exhibits zoning characteristics both vertically and *** relative standard deviation of the prediction model is only 3.7%.Concurrently,the prediction model is employed to determine the optimal timing for treatment in the study area,estimated to be 259 ***,once this threshold is reached,the study area undergoes treatment and restoration of its e cological *** study addresses the knowledge gap in this field by highlighting the interconnectedness between rock strata structure and evolution mechanism of penetrating fissures,thereby providing a method for determining the treatment timing in mining subsidence areas.

关键词： Mining subsidence Ecological restoration Fissures evolution mechanism Prediction model Treatment timing

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Segregation Behavior and evolution mechanism of Iron-Rich Phases in Molten Magnesium Alloys

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Journal of Materials Science & Technology 2016年第1期32卷 48-53页

作者： Yaoxian Zhang Wencheng Liu Xiangfa Liu Key Laboratory of Liquid–Solid Structural evolution and Processing of Materials Ministry of EducationShandong University

A new method has been proposed to prepare Mg-A1-Si master alloys by utilizing scrap AI-Si-Fe alloys with higher Fe levels, which aims to segregate Fe from AI-Si-Fe alloys by Mg melt. The segregation be- haviors, microstructure morphology and evolution mechanism of iron-rich phases in Mg-A1-Si alloy melts were studied, after AI-14Si-4Fe （wt%） alloys were added and dissolved completely. In the Mg-A1-Si alloys, iron has very little solubility and tends to combine with other elements to form intermetallic phases, which grow into a deposition layer due to the higher density. During the cooling and solidifying process of Mg-A1-Si melts, the needle-like AlsSiFe phase in AI-14Si-4Fe alloy evolved into blocky AI5Fe2 and Al0.7Fe3Si0.3 phases. Besides, the Fe levels of the Mg-AI-Si master alloys were reduced to 0.017 wt% from nominal content of 0.164 wt%. Based on the above results, this work carried out a semi-quantitative phase- compositions analysis for the deposition layer by relative intensity ratio （RIR） method, and evolution mechanism of the iron-rich phases had also been discussed. This study has paved a new way to regen- erate the scrap AI-Si-Fe alloys, which has a great significance of promoting the recycling of aluminum resources.

关键词： Iron-rich phases Mg alloy Segregation behavior evolution mechanism Recycling of scrap AI alloys

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Spatio-temporal evolution of the Rural Regional System and Its evolution mechanism in Huang-Huai-Hai Area of China

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Chinese Geographical Science 2023年第1期33卷 51-68页

作者： CHENG Mingyang CHEN Huiling Urban-rural Planning School of ArchitectureZhengzhou UniversityZhengzhou 450001China School of Public Administration and Human Geography Hunan University of Technology and BusinessChangsha 410205China

The problem of rural development arises from the evolution of rural regional *** is urgent to deepen the research on the evolution process and mechanism of rural regional ***,there are relatively few studies on rural development from the perspective of the evolution process,driving mechanism and evolution mechanism of rural regional ***,this study took Huang-Huai-Hai Area for example,started with the systematicness of the rural regional system,the spatio-temporal pattern and driving mechanism of rural regional system evolution,and further summarized and refined the evolution mechanism of the rural regional *** methods of spatial pattern analysis,gray correlation degree and geographical detection were *** results showed that the problems in rural areas were often dominated by one factor and produced by the joint action of many *** such as county urbanization,county economy,county public service,agricultural mechanization,surrounding cities and convenient transportation will affect the evolution of rural regional *** on the evolution of the elements in the rural regional system,the evolution types of rural regional system can be divided into decline type,equilibrium type and growth *** study can provide a reference for understanding the process of rural rise and fall and can also guide rural revitalization and rural sustainable development.

关键词： rural evolution rural regional system population-land-industry evolution mechanism rural revitalization Huang-Huai-Hai Area(HHHA)

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The evolution mechanism and Growth Effect of Urban Residents’ Consumption Structure Upgrading in China 36

The Evolution Mechanism and Growth Effect of Urban Residents...

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第36届中国控制会议

作者： Hao Sun Pingping Song Beijing University of Posts and Telecommunications Beijing Open University

ISBN: (纸本)9781538629185

The dynamic evolution mechanism of urban consumption structure upgrading is studied based on the construction and application of variable parameters extended linear expenditure system（TVP-ELES model）.The growth effect of consumption structure upgrade is measured based on the theory of "demand creation".The research results show that consumption structure elements such as the basic needs coefficient of residents’ consumption,marginal consumption propensity and consumption flexibility change over time *** demand coefficient is decreasing *** marginal consumption tendency of consumption expenditure such as traffic communication,health care,education and cultural entertainment increases significantly,income elasticity and price elasticity vary greatly with *** change of consumption structure has the priority to consumption *** growth effect of consumption structure has obvious enhancement *** structure upgrading should focus on the effective coordination of the change of consumption demand and the gap between urban and rural areas.

关键词： Consumption structure evolution mechanism consumption growth prospects

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Coupling and evolution mechanism of infrastructure mega-projects complex ecosystem： Case study on Hong Kong-Zhuhai-Macao Bridge

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Frontiers of Engineering Management 2018年第1期5卷 17-29页

作者： Zebin ZHAO Xiaolong XUE Xinglin GAO Gang LIU Hengqin WU School of Management Harbin Institute of Technology Harbin 150001 China Hong Kong-Zhuhai-Macao Bridge Authority Zhuhai 519015 China

Infrastructure mega-projects(IMP), which involve complex interactions and feedback, have more significant impact on economic, social, and other *** paper proposes a concept—the IMP complex ecosystem—to analyze IMP from a broad perspective of organic links across engineering, social, economic, and resource environments. Moreover, this paper proposes the theoretical concept, framework, and functions for the IMP complex ecosystem based on complex ecosystem ***, the coupling process between IMP complex ecosystem subsystems is analyzed through material flows, energy flows, information flows, and value ***, a logistic model of the IMP complex ecosystem is proposed by analyzing the evolution conditions and motivations. Third, the evolution pattern of the IMP complex ecosystem is determined. Fourth, the positive evolution strategy of the IMP complex ecosystem based on dissipative structure theory and the influencing factors of the evolutionary process is introduced. Finally, the Hong Kong-Zhuhai-Macao Bridge and Sousa chinensis are used as the case study. This paper also analyzes the coupling structure on the complex ecosystem of the Hong KongZhuhai-Macao Bridge and investigates the coupling and evolution mechanism application of the IMP complex ecosystem on Sousa chinensis protection for the Hong Kong-Zhuhai-Macao Bridge project.

关键词： infrastructure mega-projects(IMP) Hong Kong-Zhuhai-Macao Bridge complex ecosystem coupling relationship evolution mechanism

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evolution behavior and mechanism of iron carbon agglomerates under simulated blast furnace smelting conditions

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Journal of Iron and Steel Research International 2023年第9期30卷 1714-1731页

作者： Ji-wei Bao Man-sheng Chu Zheng-gen Liu Wei Lv Dong Han Li-feng Zhang School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Institute for Frontier Technologies of Low-Carbon Steelmaking Northeastern UniversityShenyang 110819LiaoningChina Liaoning Province Engineering Research Center for Technologies of Low-Carbon Steelmaking Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

Iron carbon agglomerates(ICA)are the composite burden for low-carbon blast furnace(BF)*** order to optimize the reactivity of ICA according to the evolution characteristics of ICA in the BF smelting process,the evolution behavior and mechanism of different reactive ICA under simulated BF smelting conditions were *** results show that the existence of more sillimanite and aluminosilicate and less active sites of metallic iron will weaken gasification reaction and carburization ability of ICA-1(containing 10%iron ore).It weakens the promoting effect of ICA-1 on the reduction,softening,and melting of ferrous burdens and the dripping of *** aluminosilicate with a high melting point decreases,the low melting point slag phase and Fe–Si alloy increase,and many active sites of metallic iron exist,which strengthen the gasification reaction and carburization ability of ICA-2(containing 30%iron ore).The promoting effect of ICA-2 on the reduction,softening,and melting of ferrous burdens and the dripping of slag-iron is significantly *** gasification reaction capacity of ICA-3(containing 35%iron ore)is reduced,and the improvement in ICA-3 on the softening–melting performance of mixed burdens is *** appropriate proportion of iron ore in ICA is about 30%.

关键词： Iron carbon agglomerate Reactivity evolution behavior evolution mechanism Blast furnace Softening–melting–dripping property

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Research on the Development and evolution mechanism of Chongqing Rural Tourism Activities

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International Journal of Technology Management 2015年第9期 50-52页

作者： Guodong Sun School of Tourism and Service Management Chongqing University of Education Nan'an District Chongqing 400065

In this paper, we conduct research on the development and evolution mechanism of Chongqing rural tourism activities. Rural tourism industry cluster development is the important direction is to promote and enhance the rural tourism the important measures to get long-term vitality. To upgrade the development of rural tourism to the height of the industrial cluster will make the rural tourism development onto a new level. In the future, we will combine more related literature review to polish and modify the proposed methodology which will be meaningful.

关键词： Chongqing Rural Tourism evolution mechanism Theoretical Analysis.

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Digital twin-driven green material optimal selection and evolution in product iterative design

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Advances in Manufacturing 2023年第4期11卷 647-662页

作者： Feng Xiang Ya-Dong Zhou Zhi Zhang Xiao-Fu Zou Fei Tao Ying Zuo Key Laboratory of Metallurgical Equipment and Control Technology Ministry of EducationWuhan University of Science and TechnologyWuhan430081People’s Republic of China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and TechnologyWuhan430081People’s Republic of China Institute of Artificial Intelligence Beihang UniversityBeijing100191People’s Republic of China School of Automation Science and Electrical Engineering Beihang UniversityBeijing100191People’s Republic of China Research Institute for Frontier Science Beihang UniversityBeijing100191People’s Republic of China

In recent years,green concepts have been integrated into the product iterative design in the manufacturing field to address global competition and sustainability ***,previous efforts for green material optimal selection disregarded the interaction and fusion among physical entities,virtual models,and users,resulting in distortions and inaccuracies among user,physical entity,and virtual model such as inconsistency among the expected value,predicted simulation value,and actual performance value of evaluation ***,this study proposes a digital twin-driven green material optimal selection and evolution method for product iterative ***,a novel framework is ***,an analysis is carried out from six perspectives:the digital twin model construction for green material optimal selection,evolution mechanism of the digital twin model,multi-objective prediction and optimization,algorithm design,decision-making,and product function ***,taking the material selection of a shared bicycle frame as an example,the proposed method was verified by the prediction and iterative optimization of the carbon emission index.

关键词： Product iterative design Digital twin(DT) Green material optimal selection evolution mechanism Iterative optimization

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Generation and evolution characteristics of the mushroom-like vortex generated by a submerged round laminar jet

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Journal of Hydrodynamics 2013年第5期25卷 778-787页

作者：陈云祥陈科尤云祥胡天群 State Key Laboratory of Ocean Engineering Shanghai Jiaotong University

This paper studies the formation mechanism and the evolution characteristics of the mushroom-like vortex generated by a submerged laminar round jet based on experiments, CFD simulation and a theoretical model. The results of the numerical simulations agree well with those obtained by the experiments, and three distinct stages are identified in the formation and evolution processes of the mushroom-like vortex： the starting, developing and decaying stages. Three non-dimensional parameters for such a mushroom-like vortex： the length of the jet L＊, the vortex radius R＊ and the circulation length d＊, are introduced, and the variation characteristics of these parameters with respect to the non-dimensional time t＊ are quantitatively analyzed. In the starting stage, L＊ and d＊ increase linearly with t＊ while R＊ approximately remains a constant. In the developing stage, a considerable self-similarity is observed, and L＊, R＊, d＊ have the same proportional relationship with respect to 1.1/2 regardless of the variations of the Reynolds number and the injection duration time. In the decaying stage, L＊ and R＊ are approximately proportional to t＊1/5, while d＊ nearly levels off at a constant. Furthermore, a theoretical model is proposed for the time evolution characteristics of the jet length, with predictions in good agreements with numerical and experimental results.

关键词： submerged round jet mushroom-like vortex evolution mechanism

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Dynamic Identification and evolution of Urban-suburban-rural Transition Zones Based on the Blender of Natural and Humanistic Factors: A Case Study of Chengdu, China

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Chinese Geographical Science 2024年第5期34卷 791-809页

作者： DENG Wei JIANG Zhenyuan ZHANG Shaoyao REN Ping ZHANG Hao WANG Zhanyun The Faculty Geography Resources Science Sichuan Normal UniversityChengdu 610101China Sustainable Development Research Center of Resources and Environment in Western Sichuan Sichuan Normal UniversityChengdu 610101China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China

Urban-suburban-rural(U-S-R)zones exhibit distinctive transitional characteristics in interaction between human and nature.U-S-R transition zones(U-S-RTZ)are also highlighting the function diversity and landscape heterogeneity across territorial *** a super megacity in western China,Chengdu’s rapid urbanization has driven the evolution of U-S-R spaces,resulting in a sequential *** promote the high-quality spatial development of urban-rural region in a structured and efficient manner,it is essential to con-duct a scientific examination of the multidimensional interconnection within the U-S-RTZ *** proposing a novel identifica-tion method of U-S-RTZ and taking Chengdu,China as a case study,grounded in a blender of natural and humanistic factors,this study quantitatively delineated and explored the spatial evolutions of U-S-RTZ and stated the optimization orientation and sustainable devel-opment strategies of the production-living-ecological spaces along the U-S-R *** results show that:1)it is suitable for the quantitative analysis of U-S-RTZ by established three-dimensional identification system in this study.2)In 1990-2020,the urban-sub-urban transition zones(U-STZ)in Chengdu have continuously undergone a substantial increase,and the scale of the suburban-rural transition zones(S-RTZ)has continued to expand slightly,while the space of rural-ecological transition zones(R-ETZ)has noticeably compressed.3)The landuse dynamics within U-S-RTZ has gradually increased in *** main direction of landuse transition was from farmland to construction land or woodlands,with the expansion of construction land being the most significant.4)R-ETZ primarily focus on ecological functions,and there is a trade-off relationship between the production-ecological function within the S-RTZ,and in the U-STZ,production-living composite functions are *** study emphasizes the importance of elastic planning and precise governance within the U-

关键词： transition zone urban-suburban-rural zones spatial identification evolution mechanism Chengdu,China

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