查询词典 signals

Due to its good effect in the reservation of information of signal abrupt change, mathematical morphology is often applied in the detection and location of short-term power quality disturbance, however, there is still a defect of invalid detection existing in partial detection methods based on mathematical morphology while some zero-crossing disturbances are detected. In this paper three mathematical morphology based disturbance detection and location methods, i.e., the method based on first-order derivation and morphological gradient, the method based on morphological gradient and soft threshold processing and the method based on dq decomposition and top-hat transform, are analyzed, that is, by means of simulation the adaptability of these methods in the analysis on the signals of voltage sag, voltage swell and electromagnetic transient oscillation is compared.

数学形态学因其在保留信号突变点信息方面有很好的效果，因此常用于短时电能质量扰动的检测和定位，但基于数学形态学的部分方法仍存在对某些过零点扰动检测失效的缺点，文章分析了3种基于数学形态学的扰动检测和定位方法，即基于1阶求导和形态梯度的方法、基于形态梯度和软阈值处理的方法、基于dq分解和高帽变换的方法，通过仿真比较了3种方法在分析电压暂降、电压暂升、电磁暂态振荡等信号方面的适应性，结果发现基于dq分解和高帽变换的方法在检测过零点扰动时具有很好的效果，因此选取这种方法对实测扰动数据进行了检测和定位分析。

Fractals dimension of electromyographic signals recorded with surface electrodes during isometric contractions with muscle activation .

李卓。表面肌电的信号分析及在体育科研中的应用。

By placing surface electrodes on the skin overlying the erector spinae muscle group, we can record electromyographic signals in response to chiropractic adjustments.

通过将电极脊肌肌肉群表面覆在皮肤上的安装工人，我们可以记录肌电反应整脊调整信号研究。

Motor unit firing rate is one of the important mechanisms to generate smooth muscle force output. This paper discusses the detection of firing rate from surface electromyographic signals, instead of the invasive needle EMG. The multichannel design is adopted to observe the spatial distribution of EMG firing pattern.

肌肉运动单元活化频率是人体运动控制中枢调节肌肉力量输出的主要机制之一，本文主要是研究从表面肌电讯号分析活化频率之特性，并以多频道记录的方式，分析肢体动作时活化频率在空间之分布模式。

The characteristics of the MHD structure observed in the soft x-ray tomography are as follows. It is constructed with m=2 mode oscillation, so that the magnetic surface is made up of two islands. The structure of the magnetic surface is relatively stable. It rotates in the direction of the electron dia-magnetic drift, and the rotation frequency is the half of the oscillation frequency of soft x-ray signals.

通过SX反演图象分析，MHD型磁面结构的特点：一是m=2模的振荡构成，因而此磁面始终有两个岛组成；二是磁面结构相当稳定，在MHD放电过程中没有明显变化；三是磁面结构整体沿电子逆磁方向极向旋转，旋转的频率是软X射线测量的信号频率的一半。

In operation, the wheel speed sensors at each wheel send electronic pulse signals to the control unit.

运转中，轮子速度传感器在各个轮子寄发电子脉冲信号到控制单元。

In the ablation procedure, an electrophysiologist destroys small areas of heart tissue that are responsible for the erratic electrical signals.

在消融过程，一名电子摧毁了小领域的核心组织，负责为不规则的电信号。

Therefor, a device, which can measure signals of cardiac electrophysiology and respiration for 24 hours, is quite needed.

因此，有必要开发一款便携式的可以长时间记录心电与呼吸信号的仪器。

Until recently, the only large mammal known to produce seismic signals was the elephant seal,a species whose notoriously aggressive bulls ''.

直到最近，人们所知的能够发出地震信号的大型哺乳类动物只有海象。

A 40Hz event related potentialdetecting system is introduced here. The system employs the elliptic—type filters which have excellent edge features to extract signals of narrow band frequency . It exploits the correlation—threshold method proposed by us to cancel the musc1e artifacts.

详细介绍了我们建立的一套 40 Hz ERP(4 0 Hz事件相关电位)信号检测系统，该系统使用边缘特性最好的椭圆窄带滤波器提取窄带信号，采用我们提出的相关域值法很好地剔除了肌电干扰，并在微机上实现了实验自动化和结果自动统计。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。