The eXpression of directivity of far field and near field was derived.
推导出了此类换能器的远场指向性和近场声压的表达式。
There is strong evidence that the actors wore masks that were fitted out with small megaphones to assist in increasing the directivity of the voices.
有确凿证据表明当时的表演者们戴着装有小型扩音器的面具，以辅助声音的方向性传播。
In the technology maturation phase, Raytheon's jammer will be developed and tested to ensure spectral precision, power, reactive speed and directivity.
在技术成熟阶段，雷神的干扰机将进行研发测试，以确保频谱精度、功率、反应速度和定向能力。
Audio directional loudspeaker is a novel loudspeaker which can generate an audio signal with high directivity by utilizing the parametric array principle.
声频定向扬声器是利用参量阵原理，产生高指向性声频信号的新一代扬声器。
A resource-based city's social and economic activities are based on the development, processing and utilization of resources and associated services and have a clear resource directivity.
资源型城市以资源的开发、加工、利用及相关配套服务为基本社会经济活动，具有明显的资源指向性。
No obvious directivity occurs in the songs of black cicada.
黑蝉鸣声的波形结构无明显的方向性。
Meanwhile, there was obvious directivity of topographic effects.
地形放大效应存在明显的方向性；
The directivity of the group of the point source and the line source is analyzed.
分析了点声源组和线声源的指向性。
Simulated results show that the directivity and the gain of the array are improved.
模拟结果表明，天线阵的方向性以及增益都得到了加强。
The rupture directivity effect is due to rupture propagation and radiation pattern effects.
破裂方向效应是由破裂传播和辐射图效应引起的。
Millimeter-wave dielectric lens antenna is a kind of aperture antenna with high directivity.
毫米波介质透镜天线是一种高方向性的口径天线。
The receptive array with directivity in the vertical plane has weight effect on the incident wave.
具有垂直方向指向性的接收基阵对入射声波有方向加权效应。
The sound field of the Continuous Wave and the Impulsive Wave is described by the directivity function.
用指向性函数分别描述了医用线列阵单频波和宽带波声场。
The application of conservation law of energy to the directivity synthesis is also studied in this paper.
研究了能量守恒定律在指向性综合中的应用。
The article studies a method of raising directional precision by amplitude shading in sensor arrays directivity design.
本文探讨了在传感器阵的指向性设计中利用振幅束控提高系统定向精度的一种方法。
To improve the directivity and gain, the four units of plate end-fire antennas are arranged in the direction of end-fire.
为了提高增益和方向性，把四个平板端射天线单元在端射方向上排列。
Compared to microwave, millimeter-wave has good directivity and its detecting and imaging system can have higher resolution.
与微波相比，毫米波的指向性更好，其探测成像可实现更高的分辨率。
The results for element input impedance, radiation efficiency of space wave, directivity and radiation pattern are presented.
其结果包括阵列单元的输入阻抗、空间波辐射效率、方向性系数和辐射方向图等。
In order to improve the directivity of the transducer, we have employed two complementary piezoelectric elements in the construction.
同时在结构上加以改进，利用两片压电片在结构上互补，改善了传感器的方向性。
The directivity function is used to describe the sound field of single-frequency and broad-band waves produced by a medical linear array.
用指向性函数分别描述了医用线列阵单频波和宽带波声场。
The sum and difference patterns as well as the directivity of the monopulse antenna arrays are optimized based on genetic algorithms (GA).
采用遗传算法来优化单脉冲阵列天线的和、差方向图和方向性系数。
Detailed design of the vector hydrophone is described and the experimentally measured sensitivity and directivity characteristics are given.
叙述了该矢量水听器的设计方法，给出了相应的灵敏度和指向性测试结果。
Abstract: in the process of water injection development, the water breakthrough of natural fracture has strong universality and directivity.
摘要：油田注水开发过程中，天然裂缝水窜具有强烈的普遍性和方向性。
The paper studied the measurement method for directivity of phased-array acoustic transmitter in acoustic log by experimental modeling method.
本文通过实验模拟的方法研究了声波测并相控线阵声波辐射器的指向性测量方法。
Influences of various types of damages on natural frequencies, vibration modes, acoustic radiation power and directivity of sound are studied.
考虑到不同损伤存在形式，计算分析了损伤对振动频率、模态以及声辐射特性的影响。
The radiation directivity of a complicated conformal array of underwater acoustic transducers is presented based on the boundary element method.
用边界元方法，给出了水声发射换能器共形阵各阵元的单元指向性以及基阵的自然波束指向性和束控波束指向性。
The results show that the smart antenna can efficiently strengthen useful signal, decrease interference and form the optimum directivity diagram.
结果表明，智能天线可以有效增强有用信号，降低干扰，从而形成最优的方向图。
This paper proposes a general model of sound scattering and directivity pattern for a vector sensor located on a complicated reflecting boundary.
利用边界元方法，在不规则障板边界条件下，对矢量传感器的散射声场进行了计算，得出了传感器的指向性图。
Directional coupler is widely used in modern microwave system, how to test directional coupler's directivity with high directivity is a difficulty.
定向耦合器广泛地用在现代微波系统中，高方向性定向耦合器的方向性测试是其难点。
Directional coupler is widely used in modern microwave system, how to test directional coupler's directivity with high directivity is a difficulty.
定向耦合器广泛地用在现代微波系统中，高方向性定向耦合器的方向性测试是其难点。
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