The signals were divided into segments and the frequency spectra were got and the frequency features were achieved and 4 types of variation of frequency were found.
对微地震信号预分段，用小波提取其频率谱中的频率特征，得到了频率变化的四种趋势。
The variation of frequency curve's mode peak content with the increasing of depth, shows not only the trend of chemical weathering but also variation gradient of weathering extent.
频率曲线众数峰含量随深度的变化，不但指示了化学风化趋势，而且反映了风化程度的变化梯度。
Generalized into local frequency from integral frequency, the method of joint time-frequency distribution effectively analyzes the signal based on the variation of frequency with time.
联合时频分布方法把整体频谱推广到局部频率，根据频率随着时间的变化情况，对信号进行有效的分析。
Still, the mathematical models used to rank results are usually some variation of the common term-frequency/inversed document frequency model, which is well-mapped territory.
尽管如此，用于排序结果的数学模型通常是常用的词频/倒排文档频率模型的变体，而对于这种模型，已有很好的研究基础。
Discriminator: a device that converts a property of an input signal such as frequency or phase into an amplitude variation depending on how the signal differs from a standard or reference signal.
鉴别器，鉴频器：一种将输入信号的某一特征，如频率或相位转变为幅度变化装置，其变化大小因信号与标准或参考信号的不同程度而异。
So, in engineering computation it is acceptable to neglect the directional variation of coherence value with frequency.
因此在工程计算中不计相干函数随频率的变化不会带来太大的误差。
The authors propose an additional control strategy, which changes the power or current order according to the variation of system frequency, thus the power balance of the grid can be implemented.
提出了一种附加控制策略，该附加控制策略根据系统频率的变化改变直流系统的功率或电流指令，从而实现系统功率的平衡。
The simulated extraction of weak frequency variation signal is carried out with the expressed Resonant frequency locking property when system transits from chaotic to great periodic motion.
利用系统从混沌状态到大周期转变时所表现出的共振锁频性质，进行了微弱频率变化信号的仿真提取。
It shows that the stochastic dispersion variation connected with frequency affects the frequence and the position of the black soliton.
结果表明：只有与频率有关的随机色散变化对黑孤子的频率和位置产生影响。
Orthogonal Multi-Carrier Modulation(OMCM) is adopted to overcome the frequency selectivity and time variation of low-voltage power line channel.
为克服低压电力线信道的频率选择性和时变性，系统采用正交多载波方式传输信息。
This paper probes the features of the effect on the external stores jam flutter characteristics due to the variation of parameters of vibration frequency, flutter freedom and generalized mass.
探讨了由于振动频率、颤振自由度、广义质量等参数的变化对机翼—外挂干扰颤振特性影响的一些特点。
The variation trend of estimated frequency and signal-to-noise reflect the work course off use from different side.
估计频率的变化和信噪比的变化趋势从不同的侧面反映了引信工作的历程。
The frequency of variation and utilization of exogenous DNA introduction in rice breeding were also discussed.
同时讨论了外源DNA导入水稻的变异频率和在水稻育种中的应用前景。
The variation of corner frequency and stress drop with time are analyzed, and the relations between focal parameters are discussed.
分析了拐角频率和应力降随时间的变化趋势，并讨论了震源参数相互之间的关系。
When vehicles passing ring coil detector, the interaction of vehicle body's substance and ring coil changes resonant frequency of the ring coil and forms a curve of frequency variation.
车辆通过环形线圈检测器时，车体物质与环形线圈相互作用改变了线圈的谐振频率，从而形成频率变化曲线。
When the variation of bus-bar voltage and frequency occurs, the reliability of electric motors, transformers, control and protection system is analyzed in this thesis.
当电网电压和频率的变化时，分析了电动机、变压器、控制及保护系统、照明系统、通信导航设备等受电器工作的可靠性。
The variation of temperature coefficient of resonator frequency with tolerance factor was discussed.
分析了谐振频率温度系数随容忍因子的变化关系。
Then the characteristics of frequency variation during the fatigue crack propagation process are simulated by three - dimensional dynamic finite element analysis.
并利用三维动态有限元模拟了点焊接头疲劳裂纹扩展过程中频率变化特性。
The variation of aerodynamic parameters of cascade NACA0012 and PROF under different reduced frequency shows that the reduced frequency is an important factor that influences the flutter.
NACA0012和PROF叶栅在不同折合频率下气动参数随时间的变化表明，折合频率是影响叶栅颤振的重要因素。
The variation of the amplitude has much more important influence on the suppressing chatter effect than that of the frequency.
在优选条件范围内，时变进给量幅度变化对抑振效果的影响比时变进给量频率变化的要大。
The paper studied the issue of low frequency in shallow parts of cross-hole seismic reflection sections using imaging principle and deduced frequency variation factor.
本文利用成像原理对井间地震反射剖面的浅部频率变低问题进行了研究，导出了频率变化因子。
Feed roller is driven by an electronic frequency converter which permits stepless variation of its speed and is controled to be synchronized with doffer by the computer.
给棉罗拉采用调频电机传动，实现无级变速，通过计算机控制与道夫传动同步。
A method for damage positioning is developed on the basis of testing the variation ratio of squared frequency.
介绍了基于频率变化平方比的损伤定位方法。
The study provided the variation range of paddy field hardpan roughness and the effective frequency of the hydraulic copying system.
试验研究提供了水田沟底不平度变化范围以及可以实用的插秧机液压仿形系统的仿形频次。
The variation of structural frequency before and after the damage is believed to be a most available and widely used modal parameter because of its easy testability and high measure precision.
由于结构频率测试容易测试并且有较高的测量精度，因此成为损伤识别中广泛应用的模态参数。
The variation of respiratory frequency was not significant.
呼吸频率无明显变化。
Compared with other frequency measurements, the method based on the ASIC makes use of simple periphery circuit around MPU and can self-adapts the variation of input signal frequency.
基于ASIC的方法与其他频率测量方法相比，MPU外围电路简单，能自适应输入信号频率的变化。
Because of oscillation of the blower load the variation of angular velocity of the blower rotor and beats in lower frequency are inevitable.
与风机负荷的波动相关，风机转子的角速度变化及相伴的低频拍振是不可避免的。
Because of oscillation of the blower load the variation of angular velocity of the blower rotor and beats in lower frequency are inevitable.
与风机负荷的波动相关，风机转子的角速度变化及相伴的低频拍振是不可避免的。
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