This paper examines the unequal distribution of educational resources in rural areas of China and its impact on educational equity.Through a comprehensive analysis of existing literature,case studies,and statistical d...This paper examines the unequal distribution of educational resources in rural areas of China and its impact on educational equity.Through a comprehensive analysis of existing literature,case studies,and statistical data,the research identifies key disparities in areas such as teacher-to-student ratios,educational infrastructure,and educational attainment.The study also explores the long-term effects of these disparities on social mobility and economic development in rural regions.Drawing on international experiences from countries like Finland,South Korea,and Brazil,the paper offers policy recommendations and a practical pathway for reform.These include enhancing investment in rural education,improving teacher recruitment and retention,standardizing the curriculum,leveraging technology,strengthening early childhood education,and promoting lifelong learning opportunities.The paper concludes with a call to action for policymakers,educators,and community leaders to work collaboratively towards achieving educational equity and social justice in China.展开更多
分布式新能源以“点多面广”的特征并入各级配电网,电网呈现新能源多层级接入、一体化消纳的特征。为促进新能源的充分消纳与高效利用,提出了一种多层级配电网新能源最大消纳空间测算模型,并将分布式新能源最大消纳空间测算问题转换为...分布式新能源以“点多面广”的特征并入各级配电网,电网呈现新能源多层级接入、一体化消纳的特征。为促进新能源的充分消纳与高效利用,提出了一种多层级配电网新能源最大消纳空间测算模型,并将分布式新能源最大消纳空间测算问题转换为各层级配电网新能源最大消纳空间测算子问题,实现了各层级配电网分布式新能源最大消纳空间的精确测算。首先,以多层级配电网新能源接入量最大为目标函数,基于Distflow潮流模型建立多层级配电网分布式新能源消纳空间测算模型;然后,针对模型非凸以及求解效率低等问题,基于二阶锥松弛将模型转化为混合整数二阶锥规划模型,采用交替方向乘子法(alternating direction method of multipliers,ADMM),将多层级配电网新能源消纳空间测算问题转化为各级配电网新能源最大消纳空间子问题,将消纳空间模型转化为多层级配电网分布式新能源最大消纳空间分解测算模型;最后,以IEEE 6、7、9、10、12、15测试系统为例,验证该方法的有效性。展开更多
This paper analyzes the emergence of new powers on the international scene and its relationship with natural resources. Divided into three parts, the paper first discusses the changes in the concept of natural resourc...This paper analyzes the emergence of new powers on the international scene and its relationship with natural resources. Divided into three parts, the paper first discusses the changes in the concept of natural resource. Then, the reasons that led to increased demand for them, and the consequences it generates. Finally, the text discusses possibilities of cooperation between emerging countries in search of new technologies, which should be based on renewable resources to change the present situation of unequal access and use natural resources in the world.展开更多
文摘This paper examines the unequal distribution of educational resources in rural areas of China and its impact on educational equity.Through a comprehensive analysis of existing literature,case studies,and statistical data,the research identifies key disparities in areas such as teacher-to-student ratios,educational infrastructure,and educational attainment.The study also explores the long-term effects of these disparities on social mobility and economic development in rural regions.Drawing on international experiences from countries like Finland,South Korea,and Brazil,the paper offers policy recommendations and a practical pathway for reform.These include enhancing investment in rural education,improving teacher recruitment and retention,standardizing the curriculum,leveraging technology,strengthening early childhood education,and promoting lifelong learning opportunities.The paper concludes with a call to action for policymakers,educators,and community leaders to work collaboratively towards achieving educational equity and social justice in China.
文摘分布式新能源以“点多面广”的特征并入各级配电网,电网呈现新能源多层级接入、一体化消纳的特征。为促进新能源的充分消纳与高效利用,提出了一种多层级配电网新能源最大消纳空间测算模型,并将分布式新能源最大消纳空间测算问题转换为各层级配电网新能源最大消纳空间测算子问题,实现了各层级配电网分布式新能源最大消纳空间的精确测算。首先,以多层级配电网新能源接入量最大为目标函数,基于Distflow潮流模型建立多层级配电网分布式新能源消纳空间测算模型;然后,针对模型非凸以及求解效率低等问题,基于二阶锥松弛将模型转化为混合整数二阶锥规划模型,采用交替方向乘子法(alternating direction method of multipliers,ADMM),将多层级配电网新能源消纳空间测算问题转化为各级配电网新能源最大消纳空间子问题,将消纳空间模型转化为多层级配电网分布式新能源最大消纳空间分解测算模型;最后,以IEEE 6、7、9、10、12、15测试系统为例,验证该方法的有效性。
文摘This paper analyzes the emergence of new powers on the international scene and its relationship with natural resources. Divided into three parts, the paper first discusses the changes in the concept of natural resource. Then, the reasons that led to increased demand for them, and the consequences it generates. Finally, the text discusses possibilities of cooperation between emerging countries in search of new technologies, which should be based on renewable resources to change the present situation of unequal access and use natural resources in the world.
基金Supported by the National High-Tech Research and Development Plan of China under Grant No.2004AA112010 (国家高技术研究发展计划(863))the National Basic Research Program of China under Grant No.2002CB312005 (国家重点基础研究发展计划(973))
