脉动的

On one hand, turbulences cause the thermonuclear reaction of the H-burning shell in AGB star to be unstable, and the occurrence of the thermal pulse greatly beforehand, and very frequent.

这种热脉动的提前发生不仅使氦壳层内的光度、产能率、温度发生变化，同时使氢壳层内的各物理号和恒星表面的光度都同步发生改变。

Space vector modulation is an effective measure to eliminate the electrical harmonics in the power electronic system and, consequently, is possible to be utilized to reduce the torque ripple in an inverter-fed motor.

空间矢量调制是一种常用的消除电力谐波的调制技术，更可用于电机控制中转矩脉动的削减。

The difference is discussed in the paper and a novel PMSM DTC system based on the fuzzy distribution of zero voltage vector strategy is proposed at last. Simulation results show that the new method decreases the torque ripple after using zero voltage vectors properly.

论文分析了零电压矢量在永磁同步电机直接转矩控制系统中的作用，并提出了一种基于模糊零电压矢量分配策略的永磁同步电机直接转矩控制方法，仿真结果表明该方法有效地利用零电压矢量达到了减小转矩脉动的目的。

However, we found that there are time-frequency shift between microseismic signals at different site after further investigation.

然而，通过对信号时频特征的细致分析后发现：&震前扰动&信号存在着明显的&时频偏移&现象，不完全符合&第二类脉动&的特征。

Because of periodically faulting hydrocarbon pumping migration along fault zone is periodic, intermittent and pulsant, and hydrocarbon migration and accumulation often locates the newest strata.

断裂周期性破裂活动的特征决定了油气沿断裂的垂向泵吸运移呈周期性、间歇性和脉动的特点，同时也决定了油气易于在断裂错开的最新层位聚集成藏。

In the third part, the simulation research on asynchronous motor DTC system base on six voltage space vectors and twelve voltage space vectors are realized in MATLAB/Simulink. Through comparisons of the two simulation results, the method of minifying torque ripple is obtained.

第三部分，运用MATLAB/SIMULINK进行了基于六矢量和十二矢量的两种异步电动机直接转矩控制系统的仿真研究，搭建了系统的仿真模型，并对仿真结果进行了对比，得出减小直接转矩控制转矩脉动的方法。

This thesis researching the influence of weight of the products, heating temperature, vacuum holding period and normal atmosphere holding period to the average drying rate, rehydration ability, product color of drying of carrots under condition of drying chamber volume 10^(-3) m^3, carrots size 15 mm×15 mm×5 mm, vacuum level between 0.093 MPa and 0 MPa.

以胡萝卜为试验材料，研究在干燥室体积为10^(-3)立方公尺，胡萝卜丁大小为15mm×15mm×5mm，真空度在0~0.093MPa脉动的条件下，物料量、干燥温度、真空保持时间和常压保持时间对胡萝卜的平均干燥速率、复水率、色泽的影响。

The pressure fluctuation in the draft tube is obtained. The c...

数值模拟得到的尾水管中压力脉动的频率，与湖北中试所在隔河岩进行测试的结果基本一致

It is also possible to predict both the frequency and amplitude of pressure fluctuation at the inlet and outlet of all parts of turbine, as well as the phenomenon of rolling vortex in the draft tube.

从而得出水轮机各部件内的瞬时流态和随时间的变化过程，预测了水轮机各部件内压力脉动的频率和幅值，并显示尾水管内的旋转涡带现象。

The DTC system with the rectifier using space vector modulation was studied.A novel input power factor closed-loop control method using hysterias controller was proposed in order to reduce torque ripple based on the analysis of torque ripple.

对整流环节采用空间矢量调制时的直接转矩控制系统进行了仿真研究，在分析转矩脉动的基础上给出了一种输入功率因数滞环比较的闭环控制方法。

He knows that he's one of the mostdominant players in the NBA right now.

我知道他现在是联盟里最有统治力的球员之一了。

Using analysis method of BCG , the dissertation analyzed the management of voluntary service organizations .

利用BCG分析方法对我国的志愿服务组织管理进行了分析。