We introduce and analyze operating mechanism of three major rural land joint-stock cooperative systems in China,including community type(Nanhai model),collective leasing type(Ningxia Pingluo model) and joint operating...We introduce and analyze operating mechanism of three major rural land joint-stock cooperative systems in China,including community type(Nanhai model),collective leasing type(Ningxia Pingluo model) and joint operating type(Zhejiang Jiande model).Current rural land joint-stock cooperative system has following characteristics.Firstly,adhere to the collective ownership and household contract responsibility system in rural areas.Secondly,safeguard farmers' land contractual rights and interests.Thirdly,implement large-scale agricultural production and operation.Fourthly,carry out normative operation of farmers' cooperatives.On the basis of these,we point out such problems as backward technology and short of funds in development of rural land joint-stock cooperative system.Finally,we conclude that the development of rural land joint-stock cooperative system should fully draw lessons from foreign advanced experience,actively try new model like securitization of rural land,to explore a road suitable for current national conditions.展开更多
提出了一种基于卖方灵活合同的绿电与绿证中长期联合交易机制,聚合商协商达成中长期绿电交易合同,并基于风、光出力预测误差,考虑现货市场交易的影响执行卖方灵活合同交割。同时,聚合商可通过绿证市场交易,完成绿证考核指标。为验证该...提出了一种基于卖方灵活合同的绿电与绿证中长期联合交易机制,聚合商协商达成中长期绿电交易合同,并基于风、光出力预测误差,考虑现货市场交易的影响执行卖方灵活合同交割。同时,聚合商可通过绿证市场交易,完成绿证考核指标。为验证该机制的有效性,进一步构建了聚合商绿电-绿证交易均衡模型,并设计了基于Lp-Box ADMM(alternating direction method of multipliers,交替方向乘子法)的分布式求解算法。通过模拟算例分析,验证了所提方法的有效性并分析了对聚合商交易行为及成本/收益的影响。结果表明所提出的机制可以有效实现聚合商间的中长期绿电与绿证联合交易,促进中长期绿电合同的达成,实现绿电与绿证交易的有效衔接。展开更多
文摘目的 探究本体感觉神经肌肉促进技术(PNF)对膝内侧间室骨关节炎老年患者步行时膝外展力矩和股内侧肌-内侧腓肠肌(VM-MG)共激活指数的影响。方法 2022年3月至5月,在济南社区招募膝骨关节炎老年患者32例,随机分为对照组(n=16)和训练组(n=16)。训练组接受PNF治疗,对照组自行居家运动,共6周。治疗前后采用红外运动捕捉系统同步三维测力台和肌电图系统测量患者平地步行时的膝外展力矩和肌肉共激活指数。结果 对照组3例脱落,训练组2例脱落。治疗后,训练组膝外展力矩第一峰值、第二峰值和VM-MG共激活指数均较治疗前改善(|t|> 2.460, P <0.05),且训练组膝外展力矩第一峰值、第二峰值均较对照组改善(|t|>2.454, P <0.05)。结论 PNF有助于促进膝骨关节炎患者膝关节内外间室负荷的均匀分布。
文摘We introduce and analyze operating mechanism of three major rural land joint-stock cooperative systems in China,including community type(Nanhai model),collective leasing type(Ningxia Pingluo model) and joint operating type(Zhejiang Jiande model).Current rural land joint-stock cooperative system has following characteristics.Firstly,adhere to the collective ownership and household contract responsibility system in rural areas.Secondly,safeguard farmers' land contractual rights and interests.Thirdly,implement large-scale agricultural production and operation.Fourthly,carry out normative operation of farmers' cooperatives.On the basis of these,we point out such problems as backward technology and short of funds in development of rural land joint-stock cooperative system.Finally,we conclude that the development of rural land joint-stock cooperative system should fully draw lessons from foreign advanced experience,actively try new model like securitization of rural land,to explore a road suitable for current national conditions.
文摘提出了一种基于卖方灵活合同的绿电与绿证中长期联合交易机制,聚合商协商达成中长期绿电交易合同,并基于风、光出力预测误差,考虑现货市场交易的影响执行卖方灵活合同交割。同时,聚合商可通过绿证市场交易,完成绿证考核指标。为验证该机制的有效性,进一步构建了聚合商绿电-绿证交易均衡模型,并设计了基于Lp-Box ADMM(alternating direction method of multipliers,交替方向乘子法)的分布式求解算法。通过模拟算例分析,验证了所提方法的有效性并分析了对聚合商交易行为及成本/收益的影响。结果表明所提出的机制可以有效实现聚合商间的中长期绿电与绿证联合交易,促进中长期绿电合同的达成,实现绿电与绿证交易的有效衔接。
