Ultrasound is used by many animals that detect and some of them send out very high frequency sounds.
许多动物都用超声波来进行侦查，有些动物还能发出非常高频的声音。
He says it is possible to detect different species of mosquito because their wings beat with a distinctive frequency.
他表示，检测不同种的蚊子是有可能的，因为它们翅膀扇动的频率有着明显区别。
It does this by fitting small piezoelectric acoustic sensors to parts of the structure to detect the particular frequency of noise caused by a crack in aircraft-grade aluminium.
把小型压电声传感器安装到这种构造部位上，检测由航空级铝材裂纹所致的特定频率的噪音，靠这样就能监测飞机裂纹。
Effective research and surveillance programmes are needed to detect types, frequency and clinical Settings of such events.
需要有效的研究和监测规划以查明这类事件的类型、发生频率和临床环境。
Called MyCalmBeat, the app USES a heart rate monitor that attaches to the ear to detect a person's optimal breathing rate, or resonant frequency, which is unique to each person.
这个应用名为“My CalmBeat”，它利用一个附在耳朵上的心率监测器来探测每个人独特的最佳呼吸频率，或者说是共振频率。
IBM has a rival offering, as well as one using radio-frequency identification (RfID) chips, which are embedded in packaging to detect tampering and allow precise tracking.
IBM也有一款与之竞争的产品，还有一种产品使用射频识别芯片，芯片植入包装之中，可以检测出篡改，并实现精确追踪。
It is designed to detect the low-frequency radio pulses emitted by lightning strikes.
这一系统旨在感应雷击产生的低频射电脉冲。
Through collecting vibration signal and analyzing it in the frequency domain in the condition of changing parameter cutting, a single self power spectrum is hard to detect tool breakage effectively.
在变切削参数的加工工况下，通过对振动信号的采集和频域处理，发现采用单一的自功率谱方法难以有效检测出刀片破损。
As the doohickey hummed away at a very high frequency-a whopping 6 billion cycles per second-the "piezoelectric" material in it produced a warbling electric field that was easy to detect.
当这个小装置以每秒60亿周的高频速度振荡时，它表面的“压电”材料会产生一个很容易被检测到的振动电场。
This paper studies how to detect the moving targets on the land and sea surface in the background of clutters by using pulse-pulse step frequency radar.
研究了用脉间步进频率雷达对杂波背景噪声下地面或海面动目标的探测。
The watermark was embedded in the wavelet domain using the mean quantization method. This method can be used to detect the distortion both in spatial and frequency domain.
这种算法是采用了均值量化的方法，把数字水印嵌入图像的离散小波域，可以检测在空间域和频率域的图像失真。
The Pulse Generators PGs are equipped to detect the rotor frequency of induction traction motors for the torque control in railway vehicle traction field.
铁道机车车辆牵引领域中的转矩控制是利用脉冲发生器（PG）来检测牵引感应电动机的转子频率。
Then we detect and estimate the carrier frequency of negative SNR DS-SS Signal have done. Theoretic analysis and simulation prove the validity of the arithmetic.
理论分析和仿真实验证明，在负信噪比条件下该方法可有效提高对DS-SS信号载波的检测能力。
Then proposes a method to detect the arrival time of instantaneous signal and the frequency composition under strong noise background.
提出了在强噪声背景下检测瞬时信号的到达时间和频率成分的方法。
This method not only can achieve the distortionless envelope detection of voltage flicker, but also can detect the time, frequency and amplitude of the signal accurately.
该方法不仅能够对电压闪变信号进行不失真地包络检波，而且能够精确地检测电压闪变信号的时间和包络信号的频率分量及其幅度。
The system can be used to analog signals of frequency, voltage, current simultaneously etc. Meanwhile it can be used to detect precision of the meters.
该系统能够同时模拟频率类、电压类、电流类等多种信号，还能同时检测电子仪表的精度。
This paper proposes a new method based on time frequency analysis to detect spikes automatically.
本研究提出了一种基于时频分析的癫痫脑电棘波检测方法。
A microphone attached to the bottom of the glider can pick up calls from all whales, including the high frequency call of the beaked whale, which until now has been difficult to detect.
安装在滑翔器底端的麦克风可以捕捉到所有种类的鲸鱼叫声。包括由喙鲸发出的高频率叫声，在此之前一直都难以探测。
The method which combines cross correlation detection with chaos theory to detect the weak signals relative to central frequency in overvoltage monitoring is proposed in the paper.
提出将互相关检测和混沌理论相结合应用于过电压监测中的频率跟踪，检测相对于中心频率极小的微弱信号。
First, we focus on the high frequency statistics result, then analyze its likeness of adjacent time and detect the abnormality.
首先对网络流量进行高频统计，然后对其相邻时刻进行相似度分析，根据相似度的变化来发现异常。
Objectives To detect ultrasonic knife frequency and correct the result.
目的：实现对超声刀频率的检测，并对结果进行校正。
The heterodyne detection is used to detect the output signal frequency difference between the reference arm and sensing arm, which is caused by the temperature variation.
外差探测用来探测传感臂和参考臂由于温度变化引起的输出信号的频率差异。
It is crucial to study the features of the frequency hopping signals in both time and frequency domain in order to detect and trace the FH signals.
对跳频信号的时频域进行分析是研究跳频通信，实现识别、跟踪跳频信号的重要基础。
A novel method is proposed in this paper by research on complex wavelet, in which phase information of complex wavelet transforms is used to detect frequency and harmonics.
本文通过对复小波的研究发现复小波变换的相位信息能用于频率检测和谐波分析，提出了基于复小波变换相位信息的频率和谐波检测新算法。
Local structural entropy measure in frequency division is put forward to detect local discontinuities of seismic data, by the virtue of the instantaneous attributes based on wavelet transform.
本文基于小波变换具有多尺度多分辨率分析的优点，提出了在特定的小波变换分频瞬时属性上，利用局部结构熵算法来检测地震数据的局部不连续性。
Based on element local frequency change ratio method and element modal strain energy ratio method, numerical study is carried on to detect the damage of the bridge.
利用单元局部频率变化率法和单元模态应变能比法，对连续梁桥进行了损伤诊断的数值模拟研究。
Then proposes a method to detect the arrival time of instantaneous signal and the frequency compos...
提出了在强噪声背景下检测瞬时信号的到达时间和频率成分的方法。
It can detect time, amplitude and frequency of the power quality disturbances and also detect amplitude and frequency of harmonics by this method.
通过该方法可以确定非平稳的电能质量扰动信号的时间、频率和幅值信息；同样也可以精确的检测出谐波的幅值和频率。
It could be used to detect pulse frequency and provided with circuit for pulse cycle detection.
除了可以测脉冲频率外，还有专门测脉冲周期的电路。
Aim: To detect effect of the different frequency of chronic electrical stimulation (CES) on myofibrillar isoform, myosin heavy chain (MHC) and metabolic enzyme activities.
目的：探讨不同频率慢性电刺激对膈肌肌纤维亚型、肌球蛋白重链(mhc)亚型和代谢酶活性的适应性变化的影响。
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