It is shown that the fluctuation of amplitude at the threshold of oscillation is much greater than that when the system is far from the threshold.
所得结果表明此类自振动系统在自激阈附近的振幅涨落比远离阈值时的涨落大很多。
The experiments indicate that the amplitude of plasma optic signal and fluctuation can be used as characteristic signal for real-time monitoring and control for titanium laser welding.
上述试验结果表明，可以用等离子体光信号的幅值高低和波动大小作为焊接质量实时监测和控制的特征信号。
The significant factors which exert an influence on instantaneous fluctuation of motor current are in sequence :Vari-speed wave form, vari-speed amplitude and vari-speed frequency.
在变速参数中影响电机瞬时电流波动最为显著的因素依次为变速波形、变速幅度和变速频率。
The amplitude of the fluctuation of myocardial ultrasonic integrated backscatter (IB) decreases when myocardial ischemia occurs, which makes IB important for the diagnosis of this disease.
心肌超声背向散射积分(IB)在心动周期中起伏的幅度因心肌缺血而减小，对诊断心肌缺血有重要临床意义。
This paper gives four models to simulate effects of phase fluctuation, refraction and amplitude scintillation due to ionosphere on L-band ISAR.
论文针对L波段ISAR，通过四个数学模型仿真了电离层引起的目标回波相位起伏、折射效应以及回波幅度闪烁对ISAR图像的影响。
As the modulation of amplitude is dust particle, the fluctuation and peaks are shown in the power gain spectrum.
当振幅调制为灰尘颗粒时，功率增益谱出现起伏，并且产生尖峰。
The minimum and maximum of amplitude fluctuation correspond with the minimum of precession speed after the critical point on the response curve.
振幅、相位、进动角速度在过临界后的波动频率随转速增加而增加。
Pulse signal is one of the most primary physiological signals, including the pulse frequency, the pulse rhythm, pulse-filling ratio, state of stream, state of motion, fluctuation amplitude and so on.
脉象信号，是人体最重要的生理信号之一，包括频率、节律、充盈度、通畅的情况、动势的和缓、波动的幅度等。
Results (1) There were significant differences between groups regarding cortisol levels and the amplitude of fluctuation.
结果(1)不同病因引起皮质醇增多的水平和变化幅度差异有统计学意义。
And the techniques of double-slit filter and "cross-filter" can be used to extract the near field wavefront of the laser beam with phase modulation and amplitude fluctuation.
而且，利用双狭缝滤波和“交叉滤波”技术能够提取出具有位相调制或者是具有振幅起伏的近场波面。
The model of radar target is composed of distance, bearing, speed, heading and amplitude of echo, fluctuation.
目标模型包括船舶的距离、方位、速度和回波幅度、幅度起伏。
Amplitude and phase of pressure fluctuation at the inlet of draft tube as well as the inner flow in draft tube are analyzed in detail.
详细分析了尾水管进口截面的压力脉动的幅值和相位，并对尾水管内的流动做了分析。
The result of the test shows that, there is obvious pressure fluctuation in the inlet channels, and the amplitude of the fluctuation depends on the working condition of the engine.
试验和分析表明，两缸进气道中存在着明显的压力波动，波动程度取决于发动机工况。
When the amplitude of the fluctuation is finite with respect to the average magnetic field intensity, the nonlinear terms in the garvening equations can not be droped and the WKB aproxima-tion fails.
当脉动幅度与平均磁场强度之比为有限值时，在一般情况下，控制方程中的非线性项不能略去，因而不能用WKB解来描述有限振幅脉动幅度的径向变化。
Meanwhile, by an analysis of the factors giving rise to the fluctuation of sea level the main cause of the larger amplitude fluctuations of sea level is identified.
同时，通过对相关场资料的分析，揭示了引起这种较大振幅水位波动的主要原因。
Numerical calculation results show the dependence of the power (energy) focusability on the obstruction ratio, truncation parameter, the amplitude modulation and phase fluctuation parameters.
数值计算结果表明，功率(能量)集中度与光阑的遮拦比、光束截断参数以及振幅调制和位要畸变参数等有关。
There are two factors influencing identification of low-amplitude anticlines: One is the static correction problem caused by large fluctuation of the surface landform.
低幅度背斜识别的影响因素主要有两点：一是因地表形态起伏较大而引起的静校正问题，二是构造上倾方向存在速度异常。
The amplitude of the head fluctuation decreases with the storativity and leakage of both semi-permeable layers and increases with the leakance of the silt-layer.
分析表明，承压含水层中地下水水头波幅是上、下弱透水层贮水率和越流系数的减函数，是淤泥层相对透水系数的增函数；
It is also found that the increase of damping of the cable dwindles the frequency bandwidth of large-amplitude vibrations and reduces the amplitude of vibrations, but enlarges the tension fluctuation.
增加斜拉索的阻尼可抑制其振幅，缩小其发生大幅振动的频率范围，但其张力波幅却相应增加。
Thirdly, the fluctuation of sound signal amplitude caused by one kind of non-linear internal waves is analyzed.
研究一类弱非线性内波导致的声信号幅度起伏机理。
The fluctuation of sound signal amplitude caused by one kind of non-linear internal waves is analyzed in third part.
最后在第三部分，研究一类非线性内波导致信号幅度起伏机理。
The theoretical analysis is also made for the amplitude statistical property of the CW radar echo fluctuation.
文中还对CW雷达回波振幅统计特性作了探讨。
The influence of timing jitter and amplitude fluctuation of the sampling pulses is also investigated.
同时我们还研究了采样光脉冲时间抖动和幅度抖动对光性能监测系统的影响。
The influence of timing jitter and amplitude fluctuation of the sampling pulses is also investigated.
同时我们还研究了采样光脉冲时间抖动和幅度抖动对光性能监测系统的影响。
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