农业全产业链综合效益提升是建设农业强国的重要环节。在不同发展阶段,化肥行业促进农业综合效益提升的实现机制不同。在“减量化”背景下,基于最小二乘法回归分析模型(Least Squares Regression Analysis Model),研究化肥行业推动农业...农业全产业链综合效益提升是建设农业强国的重要环节。在不同发展阶段,化肥行业促进农业综合效益提升的实现机制不同。在“减量化”背景下,基于最小二乘法回归分析模型(Least Squares Regression Analysis Model),研究化肥行业推动农业综合效益提升的影响因素,结果发现:行业监管体系的完善程度和化肥批发价格高低对提升农业综合效益具有重大影响。建议加强化肥生产、销售和使用环节的监管力度,从成本、市场供需和政策等多方面控制化肥批发价格。Improving the comprehensive benefits of the entire agricultural industry chain is an important link in building a strong agricultural country. At different stages of development, the mechanism by which the fertilizer industry promotes the improvement of comprehensive agricultural benefits varies. In the context of “reduction”, based on the Least Squares Regression Analysis Model, this study investigates the influencing factors of the fertilizer industry in promoting the improvement of agricultural comprehensive benefits. The results show that the completeness of the industry regulatory system and the high or low wholesale prices of fertilizers have a significant impact on improving agricultural comprehensive benefits. It is suggested to strengthen the supervision of the production, sales, and use of fertilizers, and control the wholesale price of fertilizers from multiple aspects such as cost, market supply and demand, and policies.展开更多
针对欠驱动水面船舶轨迹跟踪控制问题,根据模型预测控制(Model Predictive Control, MPC)原理,提出一种基于参数化模型的非线性模型预测控制(Parameterized Model-Nonlinear Model Predictive Control, PM-NMPC)方法。采用最小二乘法对...针对欠驱动水面船舶轨迹跟踪控制问题,根据模型预测控制(Model Predictive Control, MPC)原理,提出一种基于参数化模型的非线性模型预测控制(Parameterized Model-Nonlinear Model Predictive Control, PM-NMPC)方法。采用最小二乘法对船舶的参数化模型进行辩识,设计PM-NMPC控制器。对环境干扰下的某集装箱船艏向角控制和轨迹跟踪进行试验,验证控制算法的有效性,并将该控制器与比例积分微分控制器(Proportional plus Integral plus Derivative cotroller, PID cotroller)控制器进行对比。仿真结果表明,PM-NMPC控制器轨迹跟踪效果更好,对未知干扰具有更强的稳健性。展开更多
文摘农业全产业链综合效益提升是建设农业强国的重要环节。在不同发展阶段,化肥行业促进农业综合效益提升的实现机制不同。在“减量化”背景下,基于最小二乘法回归分析模型(Least Squares Regression Analysis Model),研究化肥行业推动农业综合效益提升的影响因素,结果发现:行业监管体系的完善程度和化肥批发价格高低对提升农业综合效益具有重大影响。建议加强化肥生产、销售和使用环节的监管力度,从成本、市场供需和政策等多方面控制化肥批发价格。Improving the comprehensive benefits of the entire agricultural industry chain is an important link in building a strong agricultural country. At different stages of development, the mechanism by which the fertilizer industry promotes the improvement of comprehensive agricultural benefits varies. In the context of “reduction”, based on the Least Squares Regression Analysis Model, this study investigates the influencing factors of the fertilizer industry in promoting the improvement of agricultural comprehensive benefits. The results show that the completeness of the industry regulatory system and the high or low wholesale prices of fertilizers have a significant impact on improving agricultural comprehensive benefits. It is suggested to strengthen the supervision of the production, sales, and use of fertilizers, and control the wholesale price of fertilizers from multiple aspects such as cost, market supply and demand, and policies.
文摘针对欠驱动水面船舶轨迹跟踪控制问题,根据模型预测控制(Model Predictive Control, MPC)原理,提出一种基于参数化模型的非线性模型预测控制(Parameterized Model-Nonlinear Model Predictive Control, PM-NMPC)方法。采用最小二乘法对船舶的参数化模型进行辩识,设计PM-NMPC控制器。对环境干扰下的某集装箱船艏向角控制和轨迹跟踪进行试验,验证控制算法的有效性,并将该控制器与比例积分微分控制器(Proportional plus Integral plus Derivative cotroller, PID cotroller)控制器进行对比。仿真结果表明,PM-NMPC控制器轨迹跟踪效果更好,对未知干扰具有更强的稳健性。
