Using the tensor renormalization group method based on the higher-order singular value decomposition, we have studied the phase transitions of the five-state clock model on the square lattice. The temperature dependen...Using the tensor renormalization group method based on the higher-order singular value decomposition, we have studied the phase transitions of the five-state clock model on the square lattice. The temperature dependence of the specific heat indicates the system has two phase transitions, as verified clearly by the correlation function at three representative tem- peratures. By calculating the magnetic susceptibility, we obtained only the upper critical temperature as To2 = 0.9565（7）. Investigating the fixed-point tensor, we precisely locate the transition temperatures at Tcl = 0.9029（1） and Tc2 = 0.9520（1）, consistent well with the Monte Carlo and the density matrix renormalization group results.展开更多
针对行走机构双电动机驱动的严格同步要求,采用CAN(Controller Area Network)总线时钟同步协议实现同步组单轴速度指令的同步执行.为解决齿间隙造成的两轴实际速度不协调及刚性连接的两行走电动机间的耦合关系导致的负载不均衡问题,提...针对行走机构双电动机驱动的严格同步要求,采用CAN(Controller Area Network)总线时钟同步协议实现同步组单轴速度指令的同步执行.为解决齿间隙造成的两轴实际速度不协调及刚性连接的两行走电动机间的耦合关系导致的负载不均衡问题,提出电动机电流跟随算法.实验结果表明,该算法保证了两轴同步运动的精度,实现了焊接小车快速平稳运行.展开更多
基金Project supported by the Fundamental Research Funds for the Central Universities,China(Grant No.531107040857)the Natural Science Foundation of Hunan Province,China(Grant No.851204035)the National Natural Science Foundation of China(Grant No.11774420)
文摘Using the tensor renormalization group method based on the higher-order singular value decomposition, we have studied the phase transitions of the five-state clock model on the square lattice. The temperature dependence of the specific heat indicates the system has two phase transitions, as verified clearly by the correlation function at three representative tem- peratures. By calculating the magnetic susceptibility, we obtained only the upper critical temperature as To2 = 0.9565（7）. Investigating the fixed-point tensor, we precisely locate the transition temperatures at Tcl = 0.9029（1） and Tc2 = 0.9520（1）, consistent well with the Monte Carlo and the density matrix renormalization group results.
文摘针对行走机构双电动机驱动的严格同步要求,采用CAN(Controller Area Network)总线时钟同步协议实现同步组单轴速度指令的同步执行.为解决齿间隙造成的两轴实际速度不协调及刚性连接的两行走电动机间的耦合关系导致的负载不均衡问题,提出电动机电流跟随算法.实验结果表明,该算法保证了两轴同步运动的精度,实现了焊接小车快速平稳运行.
