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coupling relation OF THE PROCESSES IN SLOPE EVOLUTION

International Journal of Sediment Research 2003年第2期 336-347页

作者： Peng HAN,Xingkui WANG,Weiling SUN,Jinren NI Department of Hydraulic and Hydropower Engineering Department of Hydraulic and Hydropower Engineering Department of Environmental Engineering Peking University Department of Environmental Engineering Peking University The Key Laboratory for Water and Sediment Sciences Ministry of Education Beijing 100871 China The Key Laboratory for Water and Sediment Sciences Ministry of Education Beijing 100871 China The Key Laboratory for Water and Sediment Sciences Ministry of Education Beijing 100871 China

A series of experiments was conducted to examine topographical variation, runoff erosion, and ion transport processes to explore the coupling relation of the different processes in slope evolution. The series includes 9 sequential experiments. In the first experiment, air-dried, crushed, and sieved loess was incrementally packed into a laboratory flume 5-m long and 1.5-m wide to a depth of 0.8 to 2.6 m. Copper nitrate (Cu(NO3)2)was mixed evenly in the top 0.2-m layer. The initial slope of the hillslope surface relief in the first experiment is 20 degrees and the initial slope of the latter experiments is the terminal relief of the former experiment. Simulated rain, applied at 90 mm/h for 90 min, was held constant in each experiment. The measured items in the experiment included slope elevation, sediment transport rate, and water discharge as well as dissolved and exchangeable nitrate (NO3-N) and copper ion (Cu2+). It was found that the sediment transport process was highly related to the topographical variation at different positions on the slope. Further analysis indicates that headcut erosion is highly related to the area draining to the rill head and landslip generally occurs at a bank with a gradient more than 65 degrees. However, the ion transport process is directly related to the processes of runoff and soil erosion rather than to the topographical variation process. Most NO3-N runs out with water, with infiltration at first and then with runoff, while the loss of Cu2+, which is affected by the pH of the solid-liquid system, is mainly determined by sediment transport owing to the different characteristics of NO3- and Cu2+.

关键词： Slope evolution process coupling relation Rills

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Dynamic Analysis of Supply and Demand coupling of Ecosystem Services in Loess Hilly Region:A Case Study of Lanzhou,China

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Chinese Geographical Science 2021年第2期31卷 276-296页

作者： LI Pengjie LIU Chunfang LIU Licheng WANG Weiting College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China Gansu Engineering Research Center of Land Utilization and Comprehension Consolidation Lanzhou 730070China College of Social Development and Public Administration Northwest Normal UniversityLanzhou 730070China

The relationship between the supply and demand for ecosystem services(ESs)is a key issue for the rational allocation of natural resources and optimisation of sustainable development *** paper investigateed the dynamic evolution features of supply and demand of four ESs in Lanzhou of China,namely,water supply,food supply,carbon fixation and soil retention *** crosssectional data of 2005 and 2017 were used for calculating ESs value and its supply and demand through ArcGIS software,InVEST model,elastic coefficient model and coupling coordination *** showed that:1)from 2005 to 2017,the supply of water supply services increased,the demand of soil retention services decreased,and the supply and demand of food supply and carbon fixation services *** high-value areas of service supply were mainly distributed in the rocky mountain areas in the southeast and northwest with high vegetation coverage,while the high-value areas of demand were mainly distributed in the urban areas and surrounding areas with high population density.2)There were five different types of coupling *** supply service was dominated by a negative coupling type D,which means that the decrease in demand for ESs has had a positive response on the supply of *** coupling type C was the main type of food supply and carbon fixation services,which means that the increase in demand for ESs has had a negative response on the supply of *** three services were supplemented by a positive coupling type A,which means that the increase in demand for ESs has had a positive response on the supply of *** retention service generally exhibits a positive coupling type B,which means that the decrease in demand for ESs has had a negative response on the supply of ESs.3)Over the past 12 yr,the coordination degree of supply and demand of water supply,food supply and soil retention services decreased,and the coordination degree of carbon fixation service increased

关键词： loess hilly region supply and demand of ecosystem services(ESs) coupling coordination degree elastic coefficient coupling relation

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Does Industry-University-Research Cooperation Matter? An Analysis of Its coupling Effect on Regional Innovation and Economic Development

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Chinese Geographical Science 2022年第5期32卷 915-930页

作者： CUI Zhizhen LI Erling Key Research Institute of Yellow River Civilization and Sustainable Development&Henan Collaborative Innovation Center for the Yellow River Civilization Heritage and Modern Civilization Construction Henan UniversityKaifeng 475001China Key Laborat-ory of Geospatial Technology for the Middle and Lower Yellow River Regions(Henan University) Ministry of Education/College of Geography and Environmental Science/Institute of Agriculture and Rural Sustainable DevelopmentHenan UniversityKaifeng 475004China

The dislocation between regional innovation and economic development directly influences the economic effect of regional innovation. However, no in-depth researches have been made on how to solve this problem. Using data from Henan Province, China,employing geographical detector technology, this paper focuses on testing whether the industry-university-research cooperation can contribute to coordinating the relation between regional innovation and economic development. It is shown that: 1) the industry-universityresearch cooperation in Henan Province is increasing gradually, and the network presents a core-edge structure, and the coupling degree between regional innovation and economic development is spatially unbalanced, which is similar to the spatial distribution of the intensity of industry-university-research cooperation;2) as an important approach to effectively connect scientific researches with market demands, the industry-university-research cooperation can help form an interactive, interconnected, coupled and coordinated virtuous relation between regional innovation and economic development. Compared with the cooperation between organizations of the same type and the separate innovation of organizations, the improvement of the industry-university-research cooperation level can better coordinate the relation between regional innovation and economic development;3) the cooperative innovation model between enterprises and universities can better promote the coupling between regional innovation and economic development, compared with many industryuniversity-research cooperation models. For underdeveloped areas lacking local knowledge base, industry-university-research cooperation should be considered as a long-term development strategy, especially using the knowledge sources of external universities and scientific research institutions to enhance innovation capability and achieve economic growth.

关键词： industry-university-research cooperation regional innovation capability economic development level coupling relation model difference Henan Province China

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Research on effect of cyber attack on power-traffic coupled systems

Research on effect of cyber attack on power-traffic coupled ...

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第43届中国控制会议

作者： Jian Zhou Tian Jiang Wen-ting Wang Hua Huang Yong-jian Cao State Grid Electric Power Research Institute Co. Ltd Nanjing NARI Information Communication Technology Co.Ltd State Grid Shandong Electric Power Company

Cyber-physical coupling relation makes the connection of power grid and traffic network more tight,and this coupling relation also brings about many treats to powertraffic coupled systems,while may suffer from cyber *** this paper,we detail the model of power-traffic coupled systems coupled of power grid and traffic network,and based on complex network theory divide the systems into two layers,power grid and virtual energy network to analyze the coupling relation between power grid and traffic ***,the models for power grid,virtual energy network and powertraffic coupled systems are *** simulation,we have analyzed the difference value of voltage magnitude in power grid with and without charging stations when power grid faces cyber attack from hacker.

关键词： Power-traffic coupled systems coupling relation power grid traffic network cyber attack

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