查询词典 acoustic velocity

The following are the expressions for the mean pressure set up at the detection plate and for the time of the signal to progagate from the radiator to the detector:这里是1个公式,省略） where Re is the real part of the expression appearing within the braces, 0 is the density of the medium, vo is the amplitude of the vibrational velocity, c is the speed of sound in the medium, d2 = I +(r/zcos 8, z is the distance between the emitting and receiving plates, B is the angle between the axis of the acoustic channel and the axis of the tube, r = vro/c, v is the flow speed of the fluid, d is the diameter of the pipe, m is the circular frequency, k is the wave number, where a is the radius of the plate (this is taken as the same for the emitting and receiving plates for simplicity, but there is no difficulty in discussing plates differ~mg in radii),,~ is the vibrational frequency of the emitting plate, and The triple sums in the expressions for N~ and N2 may be neglected if the flow speed is low, since the contributions for these become negligible.

以下的表情为代表的压力设置在检测板甲，手持骑枪和时间的信号 progagate从散热器排出到检测器(这里是1个公式、省略)。在什么地方才是真正的出现在背带，表现为0密度的吗当时的媒介的振幅振动速度、c是声音的速度中、d2 =我+ r / z，8、z是距离的发射和接收板、B之间的角度对声信道和轴轴管，r = vro / c，v的流体的流动速率公式，d 管直径的圆频率，m，凯西是波数公式* n，一个是半径的板(这是作为相同的发射和接收吗为了简单，但板板是毫无困难地讨论不同半径)、镁-，~的振动频率的发光，。总结了三倍的表达方式和N2 ~能忽略的流量速度低，因为这些变得微不足道的贡献。

The following are the expressionsfor the mean pressure set up at the detection plate and for the time of the signal toprogagate from the radiator to the detector:这里是1个公式,省略） where Re is the real part of the expression appearing within the braces, 0 is the density ofthe medium, vo is the amplitude of the vibrational velocity, c is the speed of sound in themedium, d2 = I +(r/zcos 8, z is the distance between the emitting and receiving plates, B is the angle between the axis of the acoustic channel andthe axis of the tube, r = vro/c, v is the flow speed of the fluid, d is thediameter of the pipe, m is the circular frequency, k is the wave number,where a is the radius of the plate (this is taken as the same for the emitting and receivingplates for simplicity, but there is no difficulty in discussing plates differ~mg in radii),,~ is the vibrational frequency of the emitting plate, andThe triple sums in the expressions for N~ and N2 may be neglected if the flow speed islow, since the contributions for these become negligible.

以下是表达式平均压力为定于检测板和为信号时间progagate从散热器到探测器：（这里是1个公式，省略）假如再是出现在大括号表达式的实部，0是密度中期，沃是速度的振动幅度，C是健全的速度中，D2中=我+的导向8，z是对之间的距离发射与接收板，B是声之间的通道轴角该管的轴，R =中心内大多分为/荤，v是流体的流动速度，，D是管道直径，m是圆频率，k是波数，的其中一盘是半径（这是为重点，同样的发射与接收为le简单板，但没有讨论板的困难，在半径不同毫克），，是发光板振动频率，和在N的表达式的三重总结和N2可以忽略，如果流速低，因为这些变得微不足道的贡献。

Considering the mechanical and electrical boundary conditions of AlN/GaN structures, determinantal equation which is used to solve the phase velocity of surface acoustic wave is given from the basic principle of matrix methods.

从矩阵方法的基本原理出发，结合AlN/GaN结构的机械和电学边界条件，推导出用于求解声表面波在AlN/GaN结构中的相速的行列式方程。

By reason of the dipole directivity of particle velocity sensor and also the acoustic intensity averagor, and its being able to realize the electronic rotation, coherent interferences can be effectively suppressed by skillful use of its zero point and extremal point.

振速传感器和平均声强器具有偶极子指向性，并且该指向性可实现电子旋转。巧妙利用偶极子指向性的零点和极值点，可有效地抑制声场中的相干干扰。

In this thesis, the AlN thin films were deposited on SiO2/Si and GaN/Sapphire substrates respectively for layered structure SAW devices by Helicon sputtering system. Laser ultrasound system was used to measure the acoustic wave velocity of AlN/SiO2/Si layered structure. Frequency response and insertion loss were measured by an HP8510C vector network analyzer to analysis insertion loss, sidelobe and quality factor. The results showed the possibility of incorporating thin films SAW devices with other semiconductor devices.

本研究使用回旋溅镀系统分别在SiO2/Si、GaN/Sapphire两种基板上沉积AlN并制作层状表面声波元件，并利用雷射超音波系统量测AlN/SiO2/Si结构之表面波速及机电耦合系数，再利用网路分析仪量测其频率响应，分析其插入耗损、 sidelobe、品质因子Q，以比较不同基材所制作之层状表面声波元件之特性，此研究成果初步验证AlN层状表面声波元件与半导体元件整合之可行性。

To start with, the indirect boundary element formulations are established for analysis of exterior acoustic problems and the transfer matrix relating the pressure at every field point to the normal component of surface velocity is formed.

基於辐射声压重建结构表面的振动速度存在著解的离散病态问题，从间接边界元法的双层势表达式出发，建立了外部场压和结构表面振动速度之间关系的传递矩阵。

In order to know interval velocity in layered acoustic medium,re- locity analysis is made using wave field continuation and fuzzy decision theories.

为了获得层状声学介质的层速度参数，文中依据波场延拓理论和模糊决策理论改进了速度分析。

Numerical Simulation and Experimental Investigation on A Thermoacoustic Engine with Tapered Resonance Tube A symmetrical standing-wave thermoacoustic engine with tapered resonance tube has been numerically simulated with liner thermoacoustics. The simulation shows that using tapered resonance tube in thermoacoustic engine could decrease the velocity amplitude and lower the total acoustic power loss in the resonance tube. The experimental results indicate that the harmonic was suppressed effectively by using the tapered resonance tube, and the pressure ratio was improved.

采用锥形谐振管的热声发动机的数值模拟和实验研究利用线性热声理论，对一台采用锥形谐振管的驻波型热声发动机进行了数值模拟，发现采用锥形谐振管可有效降低工质气体的速度振幅，进而减小在谐振管中声功率的损失；与一台在相同频率下工作的采用等直径圆柱谐振管的驻波型热声发动机进行了实验对比，结果表明，在使用锥形管作为谐振管的热声发动机系统中，谐振管中的非线性效应得到了明显的抑制，热声发动机在基频模式下稳定运行，压比增大而加热温度降低。

The sound velocity is one of the most important acoustic parameter in ocean sonar.

声速是海洋声呐测量中最重要的声学参数之一。

The inverse series is non-linear in the scattered field, which includes the source wavelet and a chosen reference medium's properties.;An imaging subseries of the inverse series for a 1-D constant density variable velocity acoustic medium is isolated and analyzed.

逆系列是非线性的散射场，其中包括小波的来源和选择范围中的属性。；的成像亚逆系列一维密度不断变速声中被孤立和分析。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。