After the integration of large-scale DistributedGeneration(DG)into the distribution network,the randomness and volatility of its output result in a reduction of spatiotemporal alignment between power generation and de...After the integration of large-scale DistributedGeneration(DG)into the distribution network,the randomness and volatility of its output result in a reduction of spatiotemporal alignment between power generation and demand in the distribution network,exacerbating the phenomenon of wind and solar power wastage.As a novel power system model,the fundamental concept of Regional Autonomous Power Grids(RAPGs)is to achieve localized management and energy autonomy,thereby facilitating the effective consumption of DGs.Therefore,this paper proposes a distributed resource planning strategy that enhances the autonomy capabilities of regional power grids by considering multiple evaluation indexes for autonomy.First,a regional Energy Storage(ES)configuration strategy is proposed.This strategy can select a suitable reference value for the upper limit of ES configuration based on the regional load andDGoutput to maximize the elimination of source load deviations in the region as the upper limit constraint of ES capacity.Then,a control strategy for regional ES is proposed,the charging and discharging reference line of ES is set,and multiple autonomy and economic indexes are used as objective functions to select different proportions of ES to control the distributed resources of the regional power grid and establish evaluation indexes of the internal regional generation and load power ratio,the proportion of power supply matching hours,new energy consumption rate and tie line power imbalance outside the region to evaluate changes in the regional autonomy capabilities.The final simulation results showthat in the real regional grid example,the planning method in the planning year in the region of the overall power supply matching hour ratio and new energy consumption rate increased by 3.9%and 4.8%on average,and the power imbalance of the tie line decreased by 7.8%on average.The proposed planning approach enables the maximization of regional autonomy while effectively smoothing the fluctuation of power exchange between the regional grid and the higher-level grid.This presents a rational and effective planning solution for the regional grid,facilitating the coordinated development between the region and the distribution network.展开更多
Starting from the historical evolution of China s regional coordinated development policy and practice,three stages of"enlightenment stage","development stage"and"maturity stage",as well ...Starting from the historical evolution of China s regional coordinated development policy and practice,three stages of"enlightenment stage","development stage"and"maturity stage",as well as the connotation,characteristics and content of implementing regional coordinated development strategy were analyzed.On this basis,from different aspects of industrial distribution,pollutant characteristics and regional environmental protection policy,the existing ecological and environmental protection problems in China s regional coordinated development in the new era were analyzed,and some suggestions for the next step were put forward.It is necessary to follow the"four ones"concept from the overall point of view,implement"three lines and one list"from the perspective of the width of the access red line,strengthen"joint prevention and control"from the perspective of the depth of regional regulation,deepen the"planning environmental impact assessment"from the perspective of the breadth of industrial distribution,and promote the"green-way model"from the perspective of ecological low carbon.展开更多
Objective To define optimal diagnosis and theraputic strategy of pineal region tumors. Methods Clinicalmaterials of 154 cases with pineal region tumors were analyzed retrospectively. Results The patients with pineal r...Objective To define optimal diagnosis and theraputic strategy of pineal region tumors. Methods Clinicalmaterials of 154 cases with pineal region tumors were analyzed retrospectively. Results The patients with pineal region tumors often complained of increased intracranial pressure and ocular movement deficiency.展开更多
Currently, China is advancing the Belt and Road Initiative, which creates a new opportunity of historical significance and provides guidance for the economic and social development of ethnic minority communities(parti...Currently, China is advancing the Belt and Road Initiative, which creates a new opportunity of historical significance and provides guidance for the economic and social development of ethnic minority communities(particularly those in western China). Under the new historical conditions, it is necessary to innovate and improve China's regional aid policies and regional development strategies such as the "pairing assistance" and the Western Development, and organically combine them with the Belt and Road Initiative. In the meantime, China should revolve tightly around the internal and external "connectivity," and give full play to the functions of the "pairing assistance" policy and the "Western Development" strategy in a bid to boost the ethnic development of contemporary China within the framework of the Belt and Road Initiative.展开更多
By using Fukushima's differentiable merit function,Taji,Fukushima and Ibaraki have given a globally convergent modified Newton method for the strongly monotone variational inequality problem and proved their metho...By using Fukushima's differentiable merit function,Taji,Fukushima and Ibaraki have given a globally convergent modified Newton method for the strongly monotone variational inequality problem and proved their method to be quadratically convergent under certain assumptions in 1993.In this paper a hybrid method for the variational inequality problem under the assumptions that the mapping F is continuously differentiable and its Jacobian matrix Δ F(x) is positive definite for all x∈S rather than strongly monotone and that the set S is nonempty,polyhedral,closed and convex is proposed.Armijo type line search and trust region strategies as well as Fukushima's differentiable merit function are incorporated into the method.It is then shown that the method is well defined and globally convergent and that,under the same assumptions as those of Taji et al.,the method reduces to the basic Newton method and hence the rate of convergence is quadratic.Computational experiences show the efficiency of the proposed method.展开更多
After the reform and open-door policy.the economyin the coastal region of China has experienced great develop-ment and the urban space undergone a rapid expansion.The agglomeration of cities in the economically more d...After the reform and open-door policy.the economyin the coastal region of China has experienced great develop-ment and the urban space undergone a rapid expansion.The agglomeration of cities in the economically more devel-oped region has been amazing too.The investment environ-ment in the special economic zones and open cities of thecoastal region has been greatly improved,of which the mostdistinct areas are the Pearl Delta Area,the Yangtze DeltaArea,Jing-Jin-Tang Region and the middle and southernpart of Liaoning province. The so-called coastal region stretches from Liaoningto Guangxi and Hainan,including 12 provinces,autono-展开更多
Pilot reforms gradually implemented through key nodes have become an important pattern of regional development in China since the policy of reform and opening up was in- troduced in 1978. On the basis of an analysis o...Pilot reforms gradually implemented through key nodes have become an important pattern of regional development in China since the policy of reform and opening up was in- troduced in 1978. On the basis of an analysis of the evolution processes and characteristics of regional development policies in post-reform China, this paper develops the concept and analytical framework of national node strategies (NNS), defined as regional development strategies centered on specific spatial nodes, by addressing their theoretical basis and re- search scope. The regional economic impacts of NNS were explored quantitatively through the examples of the Shenzhen Special Economic Zone, Pudong New Area and Tianjin Binhai New Area in different stages of the reform and opening up. The results indicate that the evo- lution of China's regional development policies can be divided into three stages: the explora- tion stage led by Special Economic Zones (SEZs), the expansion stage dominated by Eco- nomic Development Zones and the optimization stage featuring State-level New Areas and National Comprehensive Reform Pilot Areas. During all the three stages, NNS have played an important demonstrative and leading role and promoted the rapid evolution of China's regional development policies from localized to widespread implementation, and the role of the government has also changed accordingly. As an innovative application and development of the growth pole theory in transitional China, NNS have become engines of regional de- velopment as well as important conduits of institutional innovations. NNS and regional de- velopment have achieved a benign coupling and formed a gradated regional development model. Empirical research indicates that NNS are an important method used by the govern- ment to guide and regulate regional economic development, with complex and diverse eco- nomic effects that differ depending on the stage of regional development and the spatial scale of analysis.展开更多
基金supported by the State Grid Henan Economic Research Institute Science and Technology Project“Calculation and Demonstration of Distributed Photovoltaic Open Capacity Based on Multi-Source Heterogeneous Data”(5217L0230013).
文摘After the integration of large-scale DistributedGeneration(DG)into the distribution network,the randomness and volatility of its output result in a reduction of spatiotemporal alignment between power generation and demand in the distribution network,exacerbating the phenomenon of wind and solar power wastage.As a novel power system model,the fundamental concept of Regional Autonomous Power Grids(RAPGs)is to achieve localized management and energy autonomy,thereby facilitating the effective consumption of DGs.Therefore,this paper proposes a distributed resource planning strategy that enhances the autonomy capabilities of regional power grids by considering multiple evaluation indexes for autonomy.First,a regional Energy Storage(ES)configuration strategy is proposed.This strategy can select a suitable reference value for the upper limit of ES configuration based on the regional load andDGoutput to maximize the elimination of source load deviations in the region as the upper limit constraint of ES capacity.Then,a control strategy for regional ES is proposed,the charging and discharging reference line of ES is set,and multiple autonomy and economic indexes are used as objective functions to select different proportions of ES to control the distributed resources of the regional power grid and establish evaluation indexes of the internal regional generation and load power ratio,the proportion of power supply matching hours,new energy consumption rate and tie line power imbalance outside the region to evaluate changes in the regional autonomy capabilities.The final simulation results showthat in the real regional grid example,the planning method in the planning year in the region of the overall power supply matching hour ratio and new energy consumption rate increased by 3.9%and 4.8%on average,and the power imbalance of the tie line decreased by 7.8%on average.The proposed planning approach enables the maximization of regional autonomy while effectively smoothing the fluctuation of power exchange between the regional grid and the higher-level grid.This presents a rational and effective planning solution for the regional grid,facilitating the coordinated development between the region and the distribution network.
基金Supported by Special Project for Prevention and Control of Air Pollution from Fixed Sources of Ministry of Ecology and Environment,China(2020A060).
文摘Starting from the historical evolution of China s regional coordinated development policy and practice,three stages of"enlightenment stage","development stage"and"maturity stage",as well as the connotation,characteristics and content of implementing regional coordinated development strategy were analyzed.On this basis,from different aspects of industrial distribution,pollutant characteristics and regional environmental protection policy,the existing ecological and environmental protection problems in China s regional coordinated development in the new era were analyzed,and some suggestions for the next step were put forward.It is necessary to follow the"four ones"concept from the overall point of view,implement"three lines and one list"from the perspective of the width of the access red line,strengthen"joint prevention and control"from the perspective of the depth of regional regulation,deepen the"planning environmental impact assessment"from the perspective of the breadth of industrial distribution,and promote the"green-way model"from the perspective of ecological low carbon.
文摘Objective To define optimal diagnosis and theraputic strategy of pineal region tumors. Methods Clinicalmaterials of 154 cases with pineal region tumors were analyzed retrospectively. Results The patients with pineal region tumors often complained of increased intracranial pressure and ocular movement deficiency.
基金a staged research result of"Studies on Regional Policy Innovation and Regional Coordinated Development"(13&ZD017)a key program of the National Social Sciences Fund+1 种基金the"Strategy of Building World-Class Centrally-administered Universities(Programs)and Promoting Characteristic Development"a program supported by special government funds(96176206)
文摘Currently, China is advancing the Belt and Road Initiative, which creates a new opportunity of historical significance and provides guidance for the economic and social development of ethnic minority communities(particularly those in western China). Under the new historical conditions, it is necessary to innovate and improve China's regional aid policies and regional development strategies such as the "pairing assistance" and the Western Development, and organically combine them with the Belt and Road Initiative. In the meantime, China should revolve tightly around the internal and external "connectivity," and give full play to the functions of the "pairing assistance" policy and the "Western Development" strategy in a bid to boost the ethnic development of contemporary China within the framework of the Belt and Road Initiative.
基金Project supported by the National Natural Science Foundation of China (1 9971 0 65)
文摘By using Fukushima's differentiable merit function,Taji,Fukushima and Ibaraki have given a globally convergent modified Newton method for the strongly monotone variational inequality problem and proved their method to be quadratically convergent under certain assumptions in 1993.In this paper a hybrid method for the variational inequality problem under the assumptions that the mapping F is continuously differentiable and its Jacobian matrix Δ F(x) is positive definite for all x∈S rather than strongly monotone and that the set S is nonempty,polyhedral,closed and convex is proposed.Armijo type line search and trust region strategies as well as Fukushima's differentiable merit function are incorporated into the method.It is then shown that the method is well defined and globally convergent and that,under the same assumptions as those of Taji et al.,the method reduces to the basic Newton method and hence the rate of convergence is quadratic.Computational experiences show the efficiency of the proposed method.
文摘After the reform and open-door policy.the economyin the coastal region of China has experienced great develop-ment and the urban space undergone a rapid expansion.The agglomeration of cities in the economically more devel-oped region has been amazing too.The investment environ-ment in the special economic zones and open cities of thecoastal region has been greatly improved,of which the mostdistinct areas are the Pearl Delta Area,the Yangtze DeltaArea,Jing-Jin-Tang Region and the middle and southernpart of Liaoning province. The so-called coastal region stretches from Liaoningto Guangxi and Hainan,including 12 provinces,autono-
基金National Natural Science Foundation of China, No.41401121 The New Teachers' Scientific Research Pro- gram funded by Beijing Forestry University, No.BLX2013028
文摘Pilot reforms gradually implemented through key nodes have become an important pattern of regional development in China since the policy of reform and opening up was in- troduced in 1978. On the basis of an analysis of the evolution processes and characteristics of regional development policies in post-reform China, this paper develops the concept and analytical framework of national node strategies (NNS), defined as regional development strategies centered on specific spatial nodes, by addressing their theoretical basis and re- search scope. The regional economic impacts of NNS were explored quantitatively through the examples of the Shenzhen Special Economic Zone, Pudong New Area and Tianjin Binhai New Area in different stages of the reform and opening up. The results indicate that the evo- lution of China's regional development policies can be divided into three stages: the explora- tion stage led by Special Economic Zones (SEZs), the expansion stage dominated by Eco- nomic Development Zones and the optimization stage featuring State-level New Areas and National Comprehensive Reform Pilot Areas. During all the three stages, NNS have played an important demonstrative and leading role and promoted the rapid evolution of China's regional development policies from localized to widespread implementation, and the role of the government has also changed accordingly. As an innovative application and development of the growth pole theory in transitional China, NNS have become engines of regional de- velopment as well as important conduits of institutional innovations. NNS and regional de- velopment have achieved a benign coupling and formed a gradated regional development model. Empirical research indicates that NNS are an important method used by the govern- ment to guide and regulate regional economic development, with complex and diverse eco- nomic effects that differ depending on the stage of regional development and the spatial scale of analysis.