查询词典 oscillation

On the contrary, the opposite pattern occurs when the AACEF is stronger.(3) On interannual timescale, the changes in the SH Ferrel cell lead to the anti-phase variation of the subtropical high and the circumpolar low, i. e., the Antarctic oscillation .

研究发现，当夏季南极涛动偏强时，南极极涡和高纬度的西风急流强度都偏强，但中低纬度西风急流的强度偏弱；反之，当南极涛动偏弱时，南极极涡和高纬度西风急流强度将偏弱，中低纬度西风急流强度将偏强。

Digital simulation results show that when a step change in firing angle occurs, the first positive half-cycle time of VC will change suddenly and the subsequent electromagnetic transients appearing in the TCSC circuit will lead to overshoot and oscillations in the TCSC impedance. The range and duration of the oscillation will depend on the synchronization modes used and the manner in which the step change is introduced.

发现脉冲触发角阶跃变小时，电容电压的周期时间也突然变小，使得TCSC的导通角不会随着触发角的阶跃变化而发生突变，而是经过一个振荡过程逐渐达到稳态值，进一步揭示了电容电压同步方式下阻抗阶跃特性会出现过冲和振荡现象的原因。

Based on the 1D single electron theory of the interaction between the electron and microwave, the generation and the oscillation of microwave in the foldaway concentric cylinders resonant cavity are analyzed.

提出一种高功率微波折叠式谐振腔径向速调管振荡器，用电子与电磁场相互作用的一维单电子模型分析了这种折叠式谐振腔径向速调管振荡器的特点。

The problem of oscillation of temperature field numerical solution of blast furnace gas and stock temperature field is solved by the upwind finite element analysis , and the working conditions of blast furnace with the center coke charging is analyzed.

将迎风有限元法引入高炉煤气和炉料温度场解析，解决了强对流条件下温度场数值解的失真振荡问题，分析了中心装焦时的高炉炉况。

That is to say, during the starting process of induction motor, hold-off angle of current has gradually decreased from initial value to zero. The method can always make the displacement angle less than thyristor's firing angle. So the voltage of the induction motor won't oscillate. Therefore, the oscillation of current, electromagnetic and speed can be eliminated during the soft-starting process of induction motor. This paper verifies the correctness of the method by simulation at first.

根据上述原因，本文提出了采用关断角控制的新型控制策略，这种控制策略是使电动机在起动过程中的电流关断角由某一初始值逐渐减小到零，利用该方法可以使感应电动机起动过程中的续流角始终小于晶闸管的触发角，这样续流角的变化就不会引起电动机端电压的振荡，因而就从根本上消除了感应电动机软起动过程中的振荡现象。

Two large softwares for transient analysis of local oscillation and impulse voltage distributions in the transformer windings have been worked out.

编制了变压器线圈局部振荡分析和变压器线圈冲击电压分布计算两个大型软件。

The mechanism of oscillation overvoltage and induction overvoltage produced in transformer windings under impulse voltage conditions, the principle of the simulation of impulse voltage distribution in transformer windings, and the experience of winding insulation design using the simulation software are theoretically summarized.

在工频电压和操作电压作用下，电力变压器绕组匝间和饼间的电压差值近似按匝数平均分布。但在雷电冲击作用下，由于电压波形的波前等值频率高达数百千赫兹，绕组匝间和饼间的电容和绕组对地的电容影响已不能忽略。

The plan makes the inductance,the quality factor,the difference characteristic and the self-oscillation frequency of the...

本优化设计选取典型的单层正方形螺旋电感作为测试对象，工作频率2.439 GHz，芯片面积最大值限定为250μm×250μm。

By use of photoconductive switches triggered by the ultrafast femtosecond pulses in the terahertz time-domain spectroscopy system,the optical phonon oscillation characteristics of isomorphs KTiOPO4 and its crystallographic isomorphs RbTiOPO4 crystals are studied in the 0.5-2.0 THz range.

采用超快半导体光电导开关的宽带太赫兹时域频谱系统，研究了同族的KTiOPO4晶体与RbTiOPO4晶体在0.5-2.0 THz波段的光学声子振荡特性。

In this thesis, we also exploit the concept of multiple-pass to design a multiple-pass ring oscillator which can decrease the oscillation frequency.

本论文利用多重路径观念，设计出可以使其振荡频率减慢的连接方式。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。