The research results show that the threshold values of power frequency electric field, power frequency magnetic field and audible noises with harmful influence on biology are higher than the relevant limited values of power transmission line;

The results show that, for the case of detuning, both the second threshold and the critical frequency are always increased with the increasing of the detuning parameter.

结果表明，在失谐情形下，第二阈值和临界自脉冲频率都随失谐参量的增大而增大。

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Using the adaptive threshold filtering algorithm and frequency domain LMS filtering algorithm to suppress the narrowband interference and found some disadvantage with it.

详细研究了自适应阀值滤波算法及频域LMS滤波算法，对将其应用于导航接收机的干扰抑制的性能及缺陷做了详细分析。

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Effects of Military Noise on the Average Hearing Threshold of the Speech Frequency and High Frequency in the Elders

军事噪声对老年人言语频率及高频听力的影响

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An improved image enhancement algorithm by contour threshold nonlinear extrapolation in frequency space was proposed.

对非线性外推图像增强算法进行分析，充分考虑图像高频分量的局部特征，提出一种新的非线性滤波剪切策略包络阈值剪切算法。

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Bone conduction threshold shift at speech frequency was associated with the ages.

语频骨导听力损失程度随着患者年龄的增加而逐渐加重。

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Frequency domain filter algorithms include Threshold filter algorithm and Frequency block least mean square algorithm.

频域滤波算法有阈值滤波算法，频域块处理LMS滤波算法。

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The new methods can rapidly and efficiently obtain the informations of a real sinusoidal signal's phase on time domain or frequency domain by zero-crossings or FFT transforming. The modified methods can extend the threshold SNR of frequency estimation, and it is easily implemented.

新的修改算法利用零交越或FFT变换，能快速有效地在时域或频域上得到实正弦信号的相位信息，改善了频率估计的SNR阈值，且便于工程实现。

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First, the image is divided into two parts, high and low frequency, then we get the VQ codebook by means of comparing the threshold in high frequency and extracting representative codewords at different regions in low frequency part.

该算法将图像分割为高频、低频两部分，在高频段采用阈值比较的方法，在低频段采用分块提取的方法生成VQ码书。

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Both speech hearing threshold and high frequency hearing threshold of the noise and heat group were obviously higher than those of the group with noise exposure only, and the difference was significant ( P < 0 01).

高温噪声组的语言听阈和高频听阈比噪声组明显增高，差异均有显著性（P

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The de-noising process of the method was ( described). The effects of the size of correlation region, the hard and soft threshold, the frequency and S/ N of original signal, were discussed.

系统的描述了该方法的滤噪过程，讨论了相关运算区域大小、软硬阈值法、信号的频率、信噪比对滤噪结果的影响。

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Mixed coding method of remote sensing image based on wavelet package decomposing is that threshold of low frequency and high frequency coefficients decomposed by wavelet package is classified into important and unimportant coefficients.

基于小波包分解的遥感图像混合编码方法，首先将小波包分解后的低频和高频小波系数域值化为重要系数和非重要系数。

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The green light with a power of 11.3 mW and an efficiency of 2.3% was obtained. Laser threshold for self frequency doubling operation is measured to be 1 mW.

获得113mW的自倍频绿光输出，光光转换效率为23%，自倍频腔阈值为1mW。

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The results show that if audition threshold curve corresponding frequency dot is above 15~ 20dB, the infrasound affects many humans' physiology functions.

结果表明，在次声听阈曲线上各对应频率点为15～20dB以上时，次声对人体的多项生理指标产生了影响。

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In addition, speech hearing threshold and high frequency hearing threshold increased with the length of exposure to both heat and noise environment ( P < 0.01).

语频听阈和高频听阈随高温噪声暴露时间的延长而增高（P

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The theoretical models are given on the basis of gain threshold and lasing frequency by virture of double mirror-cavity model.

采用等效双镜腔模型，从增益阈值和振荡频率方面给出了理论模型。

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The general expression of the threshold gain and frequency in the DFB lasers was deduced by using the coupled wave function.

利用耦合波方程，推导出分布反馈激光器自混合干涉频率及增益变化的表达式。

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Experiments and Model Calculation of Soft Threshold for the Frequency Shifted Feedback Nd ∶ YLF Laser

频移反馈Nd∶YLF激光软阈值实验与模拟计算

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When the peak Stokes fluence exceed the damage threshold of frequency conversion crystals, the fatal damage on the crystals are the most serious.

TSRS效应不仅会造成泵浦光能量严重损失，使倍频效率大大降低，更严重的是，当TSRS产生的斯托克斯光的峰值能量密度大于频率转换晶体的破坏阈值时，将会造成频率转换晶体永久性破坏。

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Influence of masking noise on hearing threshold and frequency discrimination in guinea pigs

掩蔽声对豚鼠听阈和频率辨别阈的影响

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So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.

举个例子来说，我们谈论的临界频率是，光从金属表面逐出一个电子，所需的最小频率。

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