查询词典 sound frequency

Fifteen gram pyrotechnic composition with thermite content of 25% can produce the sound pressure level as high as 158.8 dB, and the acoustic frequency is mainly 0~5 kHz, then the acoustic energy decreases with the increasing of thermite content.

当高热剂的含量为25%左右时效果较佳，15 g药剂水下燃烧时的声压级达到了158.8 dB，频率主要分布在5 kHz以下，但当超过25%时声能开始下降。

To transmit sound by AC earphone and vibrator, to write the minimal hearing threshold in each frequency.

通过气导耳机和骨导振子传声，由此可判断出人耳在各个频率上所能听见的最轻的声音。

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)。

When you strike a tuning fork you activate it to send out a particular sound or frequency.

当你敲击一把音叉，它会发出特殊的音调或频率。

This tweeter is known for having a very "natural" sound with an extremely smooth frequency response that extends well beyond the human hearing range.

音单元，这是已知的有一个很"自然"的声音与一个极其顺利频率响应范围远远超出了人类听力范围内。

The structure of batscochlea is partly resembled withother mammals; meanwhile, there are some specilized aspects, which are considered asmorphologic adaptation to dealing with ultra-high frequency sound wave.

蝙蝠的耳蜗结构在部分相似于其它哺乳类动物的同时，也有部分特化现象的存在，这些特征都被认为是处理超高频声波的形态学适应。

The pictures are produced by sending ultrahigh frequency sound waves, far too high for us to hear, from probe into the body of mother.

这张是用超声波扫瞄母亲的身体后进行得到的图片。

High-frequency ultrasound has important diagnostic value in the Disease of the musculoskeletal system,as an unfound,fast and easy to reduplicative imaging in Musculoskeletal system diseases.The sound beam of ultrasonic visualization can cut through the joint space,which offers a convenient and shortcut bases in the localization.

高频彩超作为一种无创、快速、便于重复的影像学检查方法，对于肌肉骨骼系统疾病应用诊断价值高，超声显像的声束能从骨关节间隙中穿过，在定位方面提供了简便快捷的依据。

Animal's welfare can be feed back from their vocalism. We had some experiments to get 35 days old chicken's vocalization in different environment, including normal environment、 light off environment and people's disturbing environment. On the base of Mel Frequency Cepstral Coefficient, We introduction a new algorithm for feature extraction---Subband Mel Spectrum Centroid. We used support vector machine classification model to evaluate the performance of using different sound parameters.

本文通过研究35日龄海兰褐蛋鸡在正常状态、光照与人为干扰等应激下发声信息的变化特征，提出基于子带梅尔频谱质心的优化特征参数，并通过建立支持向量机模型，比较了采用优化特征参数与梅尔频标倒谱系数及其一阶、二阶导数组成的特征参数（MFCC_39）在识别不同应激中的应用效果。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。