Measurements of zero-degree breakup fragment energy distribution fromthe Coulomb-Explosions of 1.50965 MeV HD+ ion inicro-cluster beam are reported.Mean value of the internuclear separation of HD+ is found to be 0.125...Measurements of zero-degree breakup fragment energy distribution fromthe Coulomb-Explosions of 1.50965 MeV HD+ ion inicro-cluster beam are reported.Mean value of the internuclear separation of HD+ is found to be 0.12510.003 urn. Aset of high-resolution experimental arrangement and improvement of the Van-de-Graaffaccelerator are described briefly.展开更多
Objectives:In order to improve the prediction accuracy of forced-air pre-cooling for blueberries,a mathematical model of forced-air pre-cooling for blueberries based on the micro-cluster method was established.Materia...Objectives:In order to improve the prediction accuracy of forced-air pre-cooling for blueberries,a mathematical model of forced-air pre-cooling for blueberries based on the micro-cluster method was established.Materials and Methods:In order to determine the optimal micro-cluster model parameters suitable for forced air pre-cooling of blueberries,three factors controlling the micro-cluster geometry parameters were evaluated by 7/8 pre-cooling time,uniformity,and convective heat transfer coeffcient.Results:It was found that the optimal values of the number of micro-clusters(n3),the distance between individual units within a micro-cluster(a)and the distance between micro-clusters(c)were 3,0.75,and 0.2,respectively.Under these optimal values,the temperature error of the micro-cluster method remained below 1°C,achieving highly accurate temperature predictions during the blueberry pre-cooling process.The results showed that the micro-cluster method effectively solved the challenges of complex confguration,long simulation time,and low accuracy compared to the porous medium and equivalent sphere methods.Conclusion:Based on the above analysis,it can be concluded that the micro-cluster method provids a theoretical basis for optimizing forced-air pre-cooling processes and making informed control decisions.展开更多
含直流侧储能的柔性互联交流微电网群有着比传统微电网群更加明显的优势,具有重要研究意义,但是目前针对此类型微电网的控制策略研究较少。因此,本工作针对含直流侧储能和多个互联换流器(interlinking voltage source converter,IVSC)...含直流侧储能的柔性互联交流微电网群有着比传统微电网群更加明显的优势,具有重要研究意义,但是目前针对此类型微电网的控制策略研究较少。因此,本工作针对含直流侧储能和多个互联换流器(interlinking voltage source converter,IVSC)的柔性互联交流微电网群系统进行分析和研究。首先建立柔性互联交流微网群的分层分布式协调控制架构,包含本地控制层、微网控制层以及集群协调控制层。然后,针对微网控制层提出了分布式二次频率控制器以及分布式二次电压控制器,实现微网内部功率分配、频率/平均电压恢复的控制目标;针对集群协调控制层,基于微网之间关键电气量归一化原理和有限时间一致性算法,提出了多柔直IVSC的分布式对等协调控制策略,在维持直流配电母线电压稳定的同时,实现互联微电网间的功率按比例分配等控制目标。最后,利用Matlab/Simulink搭建仿真模型,验证了控制策略的有效性。展开更多
文摘Measurements of zero-degree breakup fragment energy distribution fromthe Coulomb-Explosions of 1.50965 MeV HD+ ion inicro-cluster beam are reported.Mean value of the internuclear separation of HD+ is found to be 0.12510.003 urn. Aset of high-resolution experimental arrangement and improvement of the Van-de-Graaffaccelerator are described briefly.
基金supported by the Natural Science Foundation of Shandong Province,China(No.ZR2021QC186)the China Postdoctoral Science Foundation(No.2023M743923).
文摘Objectives:In order to improve the prediction accuracy of forced-air pre-cooling for blueberries,a mathematical model of forced-air pre-cooling for blueberries based on the micro-cluster method was established.Materials and Methods:In order to determine the optimal micro-cluster model parameters suitable for forced air pre-cooling of blueberries,three factors controlling the micro-cluster geometry parameters were evaluated by 7/8 pre-cooling time,uniformity,and convective heat transfer coeffcient.Results:It was found that the optimal values of the number of micro-clusters(n3),the distance between individual units within a micro-cluster(a)and the distance between micro-clusters(c)were 3,0.75,and 0.2,respectively.Under these optimal values,the temperature error of the micro-cluster method remained below 1°C,achieving highly accurate temperature predictions during the blueberry pre-cooling process.The results showed that the micro-cluster method effectively solved the challenges of complex confguration,long simulation time,and low accuracy compared to the porous medium and equivalent sphere methods.Conclusion:Based on the above analysis,it can be concluded that the micro-cluster method provids a theoretical basis for optimizing forced-air pre-cooling processes and making informed control decisions.
文摘含直流侧储能的柔性互联交流微电网群有着比传统微电网群更加明显的优势,具有重要研究意义,但是目前针对此类型微电网的控制策略研究较少。因此,本工作针对含直流侧储能和多个互联换流器(interlinking voltage source converter,IVSC)的柔性互联交流微电网群系统进行分析和研究。首先建立柔性互联交流微网群的分层分布式协调控制架构,包含本地控制层、微网控制层以及集群协调控制层。然后,针对微网控制层提出了分布式二次频率控制器以及分布式二次电压控制器,实现微网内部功率分配、频率/平均电压恢复的控制目标;针对集群协调控制层,基于微网之间关键电气量归一化原理和有限时间一致性算法,提出了多柔直IVSC的分布式对等协调控制策略,在维持直流配电母线电压稳定的同时,实现互联微电网间的功率按比例分配等控制目标。最后,利用Matlab/Simulink搭建仿真模型,验证了控制策略的有效性。
