低频

Power system ; Underfrequency load shedding; Load frequency characteristics ; Frequency regulation factor

电力系统；低频减载；负荷频率特性；频率调节系数

Unfused contractions observed in diaphragm muscle fibers under low-frequency 100-ms stimulation indicated the potential for increased contractility with training.

在100-ms的低频刺激下，在横隔膜肌肉纤维中，可以看到非融合的收缩；这表示，经过训练，患者的收缩能力可以再增加。

In chapter two and three, for the low-frequency electromagnetic problems in multi-media, an alternate A-φ method (in Chapter 2) and a fractional-step A-φ method (in Chapter 3) based on ungauged vector potentials are developed respectively.

第二、三两章关于多媒质中的低频电磁问题发展了基于非规范势的交替A-φ方法和分数步A-φ方法，并在一定条件下对这两类方法的全离散有限元逼近误差进行了理论上的分析和估计； 3。

We select the weighting matrices in the frequency domain, and then design the controller in the state space. The cases that the plants consist of both low-frequency parameter perturbations and high-frequency unmodelled dynamics have also been considered.

文中考虑一大类存在低频摄动和高频未建模动态的情形，给出了鲁棒控制设计中兼顾闭环动态特性和干扰抑制时的加权阵选择方法与具体步骤。

Abstract］ Objective To investigate the clinical efficacy of low frequency electrotherapy on acupoints combined with magnetic force vibration heat for the treatment of vertebroarterial cervical spondylopathy.

目的 观察低频穴位电刺激结合磁热治疗椎动脉型颈椎病的临床疗效。

Abstract］ Objective To investigate the clinical efficacy of low frequency electrotherapy on acupoints combined with magnetic force vibration heat for the treatment of vertebroarterial cervical spondylopathy.

作者：毕联阳，唐占英，钱雪华，叶秀兰目的观察低频穴位电刺激结合磁热治疗椎动脉型颈椎病的临床疗效。

Starting from the output signal-to-noise ratio of vibration tables, the basic requirements of background noise of the foundation are determined, then the dynamic analysis of the foundation for tables and a laser vibrometer, and the static analysis of the foundation for the laser vibrometer are done with finite element method.

首先以振动台台面输出信噪比为出发点，确定了超低频标准振动台基础噪声的基本要求；然后采用有限元分析的数值方法，分别对振动台基础与激光测振仪基础作动力学分析，再对激光测振仪基础作静力学分析。

Reducing the complexity of vector quantization is still a main problem. This paper presents a new algorithm of minimum distortion predicting vector quantization based on intraband and interband correlation. Here the whole distortion of the vector is predicted by the part distortion of the lower frequency coefficient components of vector, resulting in a reduction of 76 percent of complexity.

降低矢量量化器的复杂度一直是人们研究的一个主要问题，本文提出一种新的基于带间相关性的最小失真预测矢量量化算法，通过矢量中前面部分低频系数分量失真的计算去预测整个矢量的失真，编码复杂度降低了76％，而解码图像信噪比下降不到1dB。

In the noise as a measure of defects in the devices, the energy distribution of oxid traps and the deep-level parameters in bipolar devices are determined by applying 1/f noise measurement and g-r noise measurement respectively.

在低频噪声用作器件缺陷表征方面，分别提出了双极型器件中氧化层陷阱能量分布的1/f噪声分析方法和深能级缺陷的g-r噪声分析方法。

With the rapid progress of the oil industry, many new and challenging problems began to face the well logging researchers in recent years, such as the development of new types of low frequency electromagnetic tools, the response of traditional induction logging sonde in highly deviated or horizontal wells, the processing technique of crosshole electromagnetic measurements, and the resistivity anisotropy, etc.

随着石油工业的不断发展，新的具有挑战性的问题不断出现在测井研究者面前，如新式低频电磁波测井仪的性能评价，大斜度井，水平井中感应测井的响应特征，井间电磁资料处理方法，电阻率各向异性问题等等。

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。