声压

The directivity gain was 6dB using the optimal weighting for four components vector sensor.

对于四输出分量的矢量传感器来说，声压和振速加权处理在各向同性噪声场中可以获得4.8dB的空间指向性增益，最优加权处理可以获得6dB的空间指向性增益。

The curve of third harmonic sound pressure level(SPL3)is alsoa "periodic function".The period length is about"first resonancefrequency" of the tube Δf=f0=c0/(2L).The magnitude of SPL3 canbe predicted by Coppens theory(with one of the parameters modified).

三次谐波声压级变化曲线为一"准周期"函数，周期长度为驻波管的第一共振频率值Δf＝f0＝C0/2L，用Coppens所推导的"共振"时公式，计算三次谐波共振峰的量值，表明仍存在差异，只有经过参数修正才能所得结果。

An experimental system, which interrogates an interferometric fiber-optic hydrophone with this method, is designed.

搭建实验系统，利用该方法对某一干涉型光纤水听器的声压灵敏度进行了测量。

The result for an aluminum sphere with gaussian pulse incident wave was compared to the theor y value obtained by inverse Fourier transform from the product of Rayleigh serie s with incident wave in the frequency domain, which shows a good agreement.

计算了高斯形脉冲入射下弹性铝球的无量纲反向散射声压，并和由频域的Rayleigh 简正级数解与入射波的频谱的乘积作反变换得到的精确解做了比较，两者趋势基本一致。

Based on the Lagrangian equation with dissipation function, the motion equation of a microbubble with shell is obtained, and the dynamic characteristics of microbubble with shell in free space are studied. It shows that the inner and outer maximum radii of the microbubble increase when the acoustic pressure and its initial radius increase, as well as when the ultrasonic frequency decreases.

理论上利用有耗散函数的Lagrange方程，建立了有壳微泡的R运动方程，开展了自由空间中有壳微泡动力学特性的研究，表明微泡内外半径增量随声压的增大、超声频率的降低、初始内径的增大及壳厚的减薄而迅速增大。

In the theoretical study, we discussed the choice of the finite element types, the determination of system parameters, and analysis of the loudspeaker's sound pressure level curve.

在分析方面，从有限元素的选择、系统参数的测量、整体模型的建立以及声压计算，都有详细的说明。

Becauseof the wide range of pressures to which the ear responds, a logarithmic scale is used and is expressed as a ratio of the

由于耳朵能感知的声压范围很大，所以采用其对数值，并以2x10-5 N/m2 (20 m Pa)的比率表示

In this case the valve outlet mach number is 0.4andthe valve noise level is approximately 85 dBA.

在这种情况下，阀门的出口马赫数为0.4，阀门的声压级约85分贝。

For plates with same thickness and material constants but different aspect ratios, we have studied how the distance from the nodal line of the first bending mode to plate center and the size of transducer affect the depths and locations of the first dips in mid frequency ranges of the plates' SPL spectra.

讨论在振动板厚度、材料常数固定不变的情形下，藉由改变振动板长？i比及激振器尺寸，来找出第一个弯曲模态图中节线到振动板中心距离与中音谷声压落差值、位置之间的关系。

The functional relationship between displacement and sound pressure was deduced by using variational principle and Bessel function. Then the analytic solution of the eardrum displacement was obtained, and moreover the ear ossicle displacement was obtained.

由变分原理及贝赛尔函数推导出人工鼓膜位移与声压的关系，得到鼓膜位移的解析解，并由此得到听骨位移。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。