低频

The dilational viscoelastic properties of partly hydrolyzed polyacrylamide and alkyl benzene sulfonate in the absence or presence of electrolyte were investigated at the decane water interface by means of longitudinal method and the interfacial tension relaxation method.

采用小幅低频振荡和界面张力弛豫技术，研究了部分水解聚丙烯酰胺(Mo-4000)和阴离子表面活性剂2-丙基-4，5-二庚基苯磺酸钠(377)体系在癸烷/水界面上的扩张黏弹性质，并考察了电解质对体系界面流变性质的影响。

In this paper,the in- fluence of the coupling aperture on the sound energy decay and coupling constant in the primary room is investigated by means of the finite-difference time-domain method,and the investigation is limited within the low-frequency range.

文中运用时域有限差分法，在低频范围内模拟了耦合窗面积的改变对主厅中不同位置的耦合常数和声能衰减的影响。

The experiment express that dehumidifier have characteristics of energy-saving and high-level efficiency when it work at low frequency.

实验表明，除湿机在低频运行时具有节能高效的特点。

In order to improve the calibration precision , we should efficaciously demodulate and dispose its signals .

为了提高校准精度，必须对低频振动台的信号进行有效的解调和处理。

In order to reduce the low frequency noise, the feedback circuit was improved by adding oscillator and demodulator.

为了有效减小低频噪声，在反馈回路里加入了振荡器和解调器。

But their applications were limited at low frequency. They are always of no effect at high frequency because the high mode denseness and complex boundary condition.

但是其应用限于低频，高频下由于复杂系统的模态密集，边界条件等参数难以确定，因而该方法适用性差。

Results revealed that the large side insulation of the stator bar in slot is available for ultrasonic pulse-echo testing; Coupling transducer on the surface of a practical stator bar could minimize the influence on the measurements of velocity, contributing no destructivity of the ultrasonic testing for stator insulation; The simultaneity of same velocity and higher attenuation can be used to detect insulation delamination from conductors; Compared with the wide sides of the bars in slot, the short sides of the bars near the exit from slot and the end bars had a same velocity and a higher attenuation; The velocity might be exactly measured on the shot sides of the bars near the exit from slot and the end bars, while the attenuation might not, which were examined though filed tests; V min decreased greatly and V av decreased slightly with the service time of the bars.

在实验室对线棒多种结构处的主绝缘和不同运行年数(未老化、16、18 和23年)线棒的主绝缘进行了低频超声反射法检测试验，并进行了现场试验，发现(参见 Hao et al， IEEE DEI， to be published)，槽部线棒的宽面绝缘不受换位绝缘的影响，比窄面绝缘更适合超声测量；线棒表面平滑的半导体层减小了耦合剂对超声测量的影响，实现了无损性；波速不变而声衰减减小可以检测线棒出现绝缘与导体脱壳缺陷；出槽口和端部线棒的窄面绝缘与槽部线棒的宽面绝缘相比，声衰减大而波速一致；现场试验验证了波速不受绝缘结构和现场测试条件的影响，而声衰减受以上因素影响很大(参见 Hao et al，中国电机工程学报， Vol.23 No.4)； V min 随运行年数明显减小， V av 随运行年数慢慢越小。

The dielectric relaxation is non-Debye dielectric relaxation when slow polarization effect cannot be neglected in the samples. And from low frequency to radio frequency, the complex ε of the samples is not consistent with Kramers-Kroning relation.

实验表明：介质中慢极化效应的存在使得其介电弛豫普遍都不是德拜型的；在超低频至射频的广阔频段，样品的复ε不满足Kramers-Kroning关系。

At very low frequency or low interchannel phase difference, this equation can be simplified to the result of Makita theory.

在极低频或通路间相位差较小的情况下，它将简化为Makita理论的结果。

In order to validate the correctness, the absolute differential cross sections of e-Ar scattering with multi-photon exchange in some special scattering geometries are calculated with Yukawa potential by applying the Second-order Born approximation and low-frequency approximation theory, respectively.

为了验证该计算方法的有效性，在入射电子的动量平行于激光场的极化方向这种特殊的散射模式下，利用Yukawa势，分别应用二阶玻恩近似方法和低频近似理论方法对激光场中电子—氩原子交换不同光子数的散射截面都进行了计算。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。