查询词典 threshold frequency

Also, based on the broad-area mode theory, the mode characteristic of external cavity semiconductors is studied. The dependence of output power, threshold and oscillation frequency on external cavity are presented and compared with experiment result.

并在此基础上，理论分析了外腔反馈注入改善半导体激光器输出激光模式特性的机理，同时还讨论了外腔反馈注入对半导体激光器输出激光的功率，出光阈值，振荡频率等特性的影响，得出了和实验结果相吻合的结论。

Low frequency sound waves (around 19 Hertz), which are below the threshold of hearing, have also been shown to precipitate a feeling of presence and the perception of shadowy images in the periphery of vision.

低频声波（约19赫兹）人耳听不到，但是也被证实可以让人产生一种有东西存在的感觉，并且在视力边缘感觉到有阴影。

ResultsThe threshold value of hearing for pure sound and air conduction at the frequency of 8KHz was significantly different(P﹤0.05 or P﹤0.01)from the re...

结果接触组中工龄≥2a或尿中TCA浓度≥50mg/L的调查对象，在8KHz频段纯音气传导听阈值与对照组的差异有统计学意义(P﹤0.05或P﹤0.01)；在接触组内，工龄≥2a的调查对象在4、6和8KHz高频段听阈值均明显高于工龄﹤2a者(P﹤0.05或P﹤0.01)。

Results Hearing threshold of both groups become worse with aging, and the treatment group showed the better auditory sensitivities, the less concentrations of MDA and the less frequency of mtDNA^4834bp deletion compare with the placebo group.

结果 （1）大鼠11月龄时，对照组与实验组的ABR反应阈为（49.3 3.9 ）dBSPL与（49.7 4.4） dBSPL（P＞0.05），耳蜗中丙二醛含量为（10.8 1.7）与（11.6 2.1） pmol/g，P＜0.05；耳蜗内mtDNA4834bp缺失的发生率比较，差异无统计学意义（P＞0.05）；（2）大鼠24月龄时，对照组与实验组的ABR反应阈、耳蜗中丙二醛含量及耳蜗内mtDNA4834bp缺失的发生率比较，差异有统计学意义（P＜0.01、P＜0.01和P＜0.05）。

The average of hearing threshold shifts at high frequencies(4k, 6k, 8kHz) is considerably larger than that at low frequencies(0.5k, 1k, 2k Hz). The moderate to severe degree of hearing loss of the paper mill workplace of subjects showed maximum notches at the frequency of 4 kHz. The noise-exposure group grades of DNA damage were significantly higher then the controls.

经扣除年龄老化因素所得到的听力损失修正值，结果显示在谈话性低频率0.5KHz、1 KHz中，女性比男性听力损失严重，并以女性、≧50岁、右耳、1 KHz 之平均值39.0±17.2dB为最高值，而於高频率2KHz至8 KHz中，不同年龄层之比较，以男性、≧50岁、右耳、8KHz之平均值49.0±27.1dB为中度至重度听力损失情形。

But statical compliance showed no change.（3）There were significant differences between the chronic sinusitis and the controls, and among stages in air hearing threshold of each frequency of chronic sinusitis. Conclusions As the stage of chronic s

随慢性鼻窦炎分型分期加重，异常导抗图、镫骨肌反射消失增多，峰压值偏向负压，坡度值增加；静态声顺值无或少变化；同时听力损伤加重。

Finally, complex multilevel threshold is used to suppress the white-noise in ultrahigh frequency PD signal which is got from stimulant GIS in lab.

结果表明，采用分层复阈值技术的复小波变换抑制自噪声的效果更好，在高信噪比或噪声抑制比的情况下，对信号的畸变也更小。

Presbycusis rate in these groups were: 60~70 41.12%; 71~80 46.25%; above 81 60.34%. The audiometric threshold showed to increase with age, especially in high frequency part.

各年龄组听阈图显示随年龄增长而提高，且高频下降更明显。3。

Grounding on the purpose of industrialization of laser, based on the thought of astigmatism compensation and thermal stability of the cavity, we employed high power LD to pump Nd:YVO4 crystal and used the introcavity frequency doubling with type 1 noncritical phase-match LBO crystal, which has high damage threshold. The cavity parameters are optimized by the use of ABCD theory and the resonatorstructure CAD software.

立足于激光器的产品化，基于谐振腔的像散补偿和热稳定性的设计思想，采用大功率LD单端泵浦Nd：YVO_4晶体，具有高光损伤阈值的Ⅰ类非临界相位匹配LBO晶体腔内倍频方案，应用ABCD定律和腔结构模拟软件CDA设计并优化了一组腔参数。

These results indicate that the brain endogenous opioid system seems to play a major role in the modulation of the micturition threshold and the frequency, whereas in the spinal region, enkephalinergic neurons seem to control the activity of sacral preganglionic neurons.

这些结果显示，脑部之内吗啡系统的抑制作用，主要和排尿反射阂值之调控有关，而脊髓部位的内吗啡系统则可直接对副交感神经节前神经元造成抑制性作用。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷