磁滞

The dielectric constant-voltage curves and polarization hysteresis loops of BST thin films with different thicknesses were investigated.

采用射频磁控溅射法制备了Ba.6Sr0.4TiO3薄膜，研究了不同膜厚的BST薄膜的介电偏压特性曲线和电滞回线。

In the implementation of the DTC method, two hysteresis comparators are used to control the magnetic flux and torque, and the switching of the inverter is decided by a optimized switching table.

控制系统采用磁链及转矩滞环比较方法得到控制量，并通过查控制电压开关表选择最优电压空间矢量的方法实现对电机的直接转矩控制。

The flux hysteresis controller was ignored in the constant torque region and an improved method was proposed to make the estimation of torque easier.The proper stator voltage space vector was selected based on the output of the torque hysteresis controller and the sector which the current rotor flux locates in.

摘 要：针对无刷直流电机直接转矩控制中磁链观测困难、控制复杂等问题，提出了一种应用于无刷直流电机二二导通方式下的新型直接转矩控制方法：在电机基频以下调速时，略去了常规的磁链观测控制环节，改进了转矩计算方法，通过转矩滞环控制选择所施加的空间电压矢量。

A new brushless DC motor DTC scheme was studied to solve those problems associated with direct torque controlof brushless DC motor,such as difficulty to control flux and complexity to estimate torque.The flux hysteresis controller was ignored in the constant torque region and an improved method was proposed to make the estimation of torque easier.The proper stator voltage space vector was selected based on the output of the torque hysteresis controller and the sector which the current rotor flux locates in.

摘 要：针对无刷直流电机直接转矩控制中磁链观测困难、控制复杂等问题，提出了一种应用于无刷直流电机二二导通方式下的新型直接转矩控制方法：在电机基频以下调速时，略去了常规的磁链观测控制环节，改进了转矩计算方法，通过转矩滞环控制选择所施加的空间电压矢量。

In this thesis the nonlinear hysteretic model is chosen as the mathematical model of magneto-rheological lead-lag dampers.

本文选择磁流变阻尼器的非线性滞回模型作为磁流变减摆器的数学模型。

By analyzing numerically the disks around a young stellar object and a black hole, we can obtain: the dissipation can not be neglected as a magnetic field is in small threshold value; in Keplerian disks, the magnetic field is smaller, the dissipation caused by anomalous viscosity and anomalous resistivity deviates from the ideal more greatly; the dissipative effects on magnetic instability become smaller as the radius r becomes larger.

通过分析年轻恒星周围和黑洞周围吸积盘的数值解可以得到：在磁场比较小的一段阈值内，这种耗散过程是不可忽略的；而且，磁场越小，由反常黏滞及反常阻抗引起的耗散过程对磁不稳定性的影响就越大；离中心体的距离r越大，耗散过程对磁不稳定性的影响越小。

In order to prevent the increase /decrease switch node from conglutinating, the increase/decrease switch will be locked by the procedure if the increase/decrease switch operates continuously over 3 seconds, revert the switch to unblock the lock command.

为了防止增减磁开关粘滞，如果连续增磁或减磁操作超过3秒钟，增减磁开关将被程序锁定，可反转开关解除锁定命令。

As nanocrystalline permanent magnets are quite different from traditional permanent magnets, the effect of intergrain exchange coupling on magnetic viscosity has been investigated in nanocrystalline rare-earth permanent magnets.

纳米晶永磁不同于传统的永磁材料，本项目研究了纳米稀土永磁中晶间交换耦合作用对磁粘滞的影响以及材料的反磁化机制与磁粘滞性的内在关系。

The leakage current density of OSG is investigated by I-V measure. The dielectric constant, hysteresis phenomenon, capacitance-voltage curve shift and stretch-out of OSG is investigated by C-V measure.

利用电容-电压量测探讨薄膜的介电常数、C-V曲线的偏移、扭曲(stretch-out)、C-V磁滞的现象以及利用电-电压量测探讨薄膜的漏电流密度。

The model of the outer layer hard and inter layer soft magnetic structure was suggested that the amorphous ribbon and wire are constituted by the relatively"hard" magnetic"shell"with relatively high magnetic coercivity and relatively"soft"magnetic "core"with relatively low magnetic coercivity.

非晶材料的尖锐脉冲电压现象是由于具有显著的不可逆壁移磁化过程导致大巴克豪森跳跃所造成的，脉冲的尖锐性与动态磁滞回线的形态密切相关，回线的方形度越高，则脉冲愈尖锐。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。