directivity

英[dɪrek'tɪvɪtɪ] 美[dɪrek'tɪvɪtɪ]

n. 方向性

directional adj.方向的
directive adj.指导的；指挥的；管理的n.指令
directivity n.方向性
directly adv.直接地；立即；正好地；完全conj.一...就...
directness n.直接；直率

Noun:

the property of a microphone or antenna of being more sensitive in one direction than in another;
"the antenna received signals with no directivity"
the quality of being directive

1. The antenna received signals with no directivity.: 那种天线可接受没有方向性的信号。

2. Then they discovered that the directivity of the magnet.: 后来又发现了磁石的指向性。

3. 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。

4. 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。

5. Why is it necessary to explain the directivity of thoughts and provide clues?: 为什么让别人感受到，为什么会有自我的思维指向和线索？

6. 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。

7. 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。

8. The directivity of in array excited by weighted Walsh current has also been calculated.: 最后计算用沃尔什电流加权激励的天线阶的方向性。

9. 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。

10. 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。

11. 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。

12. The third part is about the research on the improvement of the directivity of antennas using wire medium.: 然后研究谐振腔天线一些参数的对其频带和方向性的影响。

13. 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。

14. 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。

15. 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。

16. In fact, the two Stradivarius instruments showed respectively the highest and the lowest degrees of directivity in the sample.: 事实上，这两个斯特拉迪瓦里的文书显示，分别是最高和最低程度的方向性的样本。

17. 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。

18. 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。

19. 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。

20. 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。

21. 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。

22. 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。

23. 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。

24. 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。

25. 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。

26. 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。

27. 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。

28. 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。

用作名词 (n.)

The antenna received signals with no directivity.
那种天线可接受没有方向性的信号。

transducer directivity 换能器指向性...
microphone directivity 传声器指向性...
directivity separation 分方向的隔离...
directivity characteristic 方向特性曲线...
transmitting directivity 发射方向性
directivity pattern 指向性图案,方向性图...
controlled directivity 天线的受控方向性...
directivity gain 指向性因数
directivity diagram 方向性图,方向图...
directivity index 定向指数
binaural directivity 双耳指向性
directivity factor 指向性因数
antenna directivity 天线方向性
directivity function 定向性函数
vertical directivity 竖直方向性
sharp directivity 锐方向性
directivity graph 方向特性图
receiving directivity 接收方向性
directivity signal 方向性信号

【近义词】

directiveness 趋向或趋势的确定...
directionality 方向性

direct to direct direct left turn direct syntheses direct diagnosis direct discharge direct transport direct pick-up Direct Experence directed seeding direct nitration direct importing

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