声学

Neuroacoustic research has shown that brainwaves tend to resonate with our sound environment.

神经声学的研究显示，脑波会与环境中的声音产生共振。

Selfresonant cavitating jet is a kind of modulated jet with significant impact pressure fluctuations and cavitation effects.

自振空化射流是利用瞬态流和水声学原理调制而成的一种新型射流，本文研究了自振空化射流在常压及围压下的压力脉动特性及其参数影响规律。

In long spaces, such as road or railway tunnels, underground/railway stations, corridors, and concourses, classic room acoustic theory is not applicable since the assumption of a diffuse field does not hold with the extreme dimensional condition.

在长空间中，如公路或铁路的隧道、地铁站、走廊和交通枢纽大厅，由于对扩散场的假设不适用于其极端的尺寸条件，因此无法应用经典的声学理论。

The 3-D numerical methods are used to predict the acoustic attenuation performance and flow resistance characteristics of internal combustion engine exhaust silencer s.

使用三维数值计算方法预测内燃机排气消声器的声学性能和阻力特性。

At the same time, the resonant frequencies of four kinds of resonator are calculated by the programs which are made with Matlab software. The effect of resonator geometrical parameters on resonant frequency is theoretically analyzed. In order to carry out the acoustic and aerodynamics performances tests, seven resonators are designed and made, and a specialized engine intake silencer and exhaust silencers test bench was designed. The tests and analysis are performed as well.

在此基础上设计并加工了两类七个共振型进气消声器，研制了发动机进排气消声器性能测试实验台，开发了发动机进排气消声器声学性能测试软件，并在该实验台上测试了所设计的进气消声器静态工况下的传声损失，从实验的角度研究了共振腔的尺寸、形状对其共振频率的影响及其趋势。

A field coil driver uses a dedicated power supply to feed its field coil to produce the strong magnetic field that makes the diaphragm react to the incoming electrical signals and reproduce sound, the stronger the magnetic field the more efficient the driver would be and the higher and lower frequencies it will respond up to the diaphragm physical and acoustical limits.

实地线圈驱动器采用专用电源给其外地线圈产生的强磁场，使膈肌反应传入的电子信号，并重现声音，强大的磁场更有效地将司机和更高和较低的频率，将应对行动膈肌物理和声学限制。

The complex pressure field resulted from a high-speed train entering a tunnel was investigated based on the theory of aerodynamic sound.

应用气动声学理论对高速列车突入隧道引起的复杂压力场进行了研究。

Methods Measurement of voice signal was made using micro-computer and acoustic software during sustained phonation of vowel /a/ in 50 healthy subjects and 50 patients with benign vocal fold lesions.The harmonic waves,formants and noise of the sonogram were analysed. Results There were significant differences of acoustic characteristics between normal and pathologic groups.

采用&电子计算机声学测试系统&对50例正常成人及50例声带良性增生性疾病患者发持续元音/a/时的声音信号进行检测，分析元音语图谐波、共振峰及噪声成分特征及变化规律。

The acousic parameters and spectrographic characteristics (harmonic waves,formants and noise) were analyzed.The resubs obtained by acoustic technique were compared with those of perceptual evaluation.Results The acoustic parameters were significantly increased in all patients with laryngeal diseases.

Speech Science for Windows软件对78例正常成人及98例喉病患者元音信号进行检测，对其主要声学参数及声谱图特征(谐波、共振峰、噪声成分等)进行分析，并与主观听觉评价结果进行了比较。

It is agreed by most makers of handmade instruments, that the acoustic properties of French polish are far superior to that of any other finish.

大多数手工乐器制作师都同意虫胶漆涂装在声学性能方面来说优于其它任何一种漆的说法。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。