directivity 中文意思是什麼

directivity 解釋
定向功能
  1. Part ii : the school moral communication, being a special form of moral communication, has its own characteristics, such as directivity, exemplarity, emotivity, inspirativity, stability and consistency

    第二部分：學校道德交往是道德交往的特殊形態，它具有自身的特點，如導向性與示範性，情感性與激勵性，穩定性與連續性等。
  2. In chapter 2, a simplified analytical model is presented for the analysis of the bvi mechanism, adopting the beddoes " prescribed wake model. by this model, the azimuthal location and miss - distance of the bvi and the radiation directivity of the bvi noise are calculated and discussed, and some conclusions are obtained

    在第二章，使用beddoes預定尾跡模型，建立了一個用於旋翼槳-渦干擾特性機理分析的簡化數學模型，分別對旋翼槳-渦干擾位置、槳-渦干擾距離和聲輻射方向性等進行了計算和分析，得出了有意義的結果。
  3. The antenna gain, directivity and reflection coefficient are calculated via finite element method in hfss. spline interpolation and polynomial curve fitting are applied to construct diagrams illustrating the capsulation characteristics. some general conclusions of interest are obtained

    探討了各個封裝參數對輸入端反射系數、方向性系數、效率和增益等性能指標的影響，得到一些規律性結論，為射頻振子天線的封裝應用提供了參考性的建議，並指出了進一步研究的方向。
  4. The directivity shows that the np i is the fault plane, and that the earthquake ruptured unilaterally from the northeast to the southwest, nearly perpendicular to the strike of the java trench

    P波顯示的方向性效應表明：走向為199的節面是斷層面。破裂傳播方向為自東北向西南方向，幾乎垂直於爪哇海溝走向。
  5. The source time function directivity is in accordance with the p waveform directivity, clearly showing that the nodal plane of strike 199 is the fault plane and that the earthquake ruptured unilaterally from the northeast to the southwest

    震源時間函數的這種方向性效應與p波的方向性效應相一致，清楚地表明：走向為199的節面為斷層面，地震是從東北向西南方向單側破裂的。
  6. The result shows that the pbg structure has obvious character of forbidden band at the suitable size, and can be designed to good performance microwave filter. the pbg structure have the character of high resistance, that can reinforce the forward radiation, and reduce the backward radiation, increase the directivity, improve the gain and ameliorate the performance of the antenna. in addition, the pbg structure can also greatly increase the isolation and significantly decrease the coupling between the antenna elements

    研究結果表面，取合適的尺寸時， pbg結構具有明顯的禁帶特性，可以設計成性能良好的微波濾波器； pbg結構具有高阻特性，把這種特性用於微波天線時， pbg結構可以加強前向輻射，減小後向輻射，增大天線的方向性系數，從而提高天線的增益，改善天線的性能，另外， pbg結構還可以大大提高天線單元之間的隔離度，顯著減小天線單元間的耦合。
  7. These are important for developing new antennas with a high directivity and a high workability

    這些結果對發展高方向性、可實用化的新型天線具有重要意義。
  8. The gain of the extended fiber optic hydrophone and the hydrophone array is related to the directivity of the hydrophone and the noise model used to calculate. an extended hydrophone based on the fiber optic michelson interferometer consist of four same sensing units is constructed, of which every unit is reeled on a mandrel with polymer to enhance the sensitivity

    論文在實驗上完成了基於光纖邁克爾遜干涉儀結構的成組光纖水聽器的光學設計和機械設計，製作了子單元間距為0 . 16m ，全長為0 . 52m的4子單元成組光纖水聽器。
  9. Particularly, kinesin, which has the feature of directivity and stepping motion, has been focused on its particular dynamical mechanism

    特別是驅動蛋白馬達，它具有定向梯跳的運動特性，其中蘊含的動力學機制已成為眾多研究者們關注的焦點。
  10. When the motion of the motors is coordinated, the macroscopic directed motion is brought. especially, kinesin, which has the feature of the directivity and stepping motion, has been focused on its particular dynamical mechanism

    當分子馬達的運動協調起來就產生了宏觀的運動而做功，其中蘊含的動力學機制已成為眾多研究者們關注的焦點。
  11. A large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning

    應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客機進場著陸過程中的機體噪聲源進行了實驗測量，本文對七架窄體客機和七架寬體客機的起落架噪聲進行了分析，得到了起落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起落架噪聲的頻譜是由寬頻隨機噪聲與一些較為明顯的單音噪聲源組成，起落架噪聲的指向性類似於一個水平放置的偶極子.不同飛機起落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起落架噪聲。
  12. The performance of the pbg antenna using the new pbg cover together with a pbg substrate is studied by the fdtd method together with the pml boundary treatment. the numerical results show that a more focused beam radiated in the broadside direction is achieved. the gain of the pbg patch antenna in the forward direction is improved by about 6 db. the radiation directivity is improved significantly and reaches 11. 5 db, which is 0. 4 db less than the maximum value that is allowed physically for this size of the antenna ( this difference is about 4. 1 db less than the difference achieved by thevenot et al.,

    用fdtd方法並結合pml吸收邊界條件，我們對加了這種新的覆層結構並且基底鉆孔的復合結構電磁（光子）晶體貼片天線的性能進行了研究，結果證明加了這種新的電磁晶體覆層結構以後，天線的波束收攏很多，並且向前輻射的增益大大提高，與普通天線相比，天線的e面和h面方向圖上向前輻射的增益均提高了約6db ，另外，該復合結構天線的方向性系數達到了11 . 5浙江大學博士學位論文db ，與該物理尺寸天線的方向性系數的理論極限值（ 11 . 9db ）相差0 . 4db ，該差值比thevenot等人設計的電磁晶體覆層天線的相應差值減少了約4 . 1db ，比qiu等人設計的電磁晶體天線的相應差值減少了約1
  13. But to circular plate with large surface area, the vibrate modes generated is often so high that there is reverse phases existing, which result in a decrease in radiation impedance, electric - acoustic efficiency and the electric power, as well as poor directivity

    然而對于輻射面積較大的彎曲振動圓盤，一般激勵的振動階數比較高，因此存在彎曲振動的反相區，導致換能器的輻射阻抗下降，電聲效率和聲功率降低以及指向性變差等問題。
  14. Noise directivity of impinging jet from a small diameter axis ymmetric convergent nozzle on a large flat plate

    低速沖擊載荷下加筋板彈塑動力響應分析
  15. The conclusions are as follows : the ultrasonic intensity is proportion to the laser intensity ; the ultrasonic induced by a laser line source has much more advantages than by a laser point source, such as stronger energy, higher snr, more directivity and shape ; the intensity of cfpi ' s output signal is linear with ultrasonic vibration velocity, and is effected by incidence angle and scattered angle ; snr will increase by reducing cfpi ' s bandwidth, reducing incidence angle, increasing cavity ' s length and reflectivity

    在分析點光源激勵聲表面波機理的基礎上，求出了線光源激勵的超聲振動的位移表達式，發現線光源激勵的近場區表面波具有波形好，信噪比高，指向性好，幅度強等特點。通過理論推導，得出共焦fabry - perot干涉儀的輸出光強除了與樣品表面的振動速度成正比，並與入射角和散射角有關；適當減小cfpi的帶寬，增加腔長，增大鏡面反射率，或者減小檢測入射角都可以提高系統的信噪比。
  16. Abstract : a large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning

    文摘:應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客機進場著陸過程中的機體噪聲源進行了實驗測量，本文對七架窄體客機和七架寬體客機的起落架噪聲進行了分析，得到了起落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起落架噪聲的頻譜是由寬頻隨機噪聲與一些較為明顯的單音噪聲源組成，起落架噪聲的指向性類似於一個水平放置的偶極子.不同飛機起落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起落架噪聲。
  17. And there was a spatial distribution rule that was obviously regional concentration and the directivity of main roads

    湖北省縣域經濟發展水平由高到低呈金字塔狀，且空間差異明顯，其分佈具有明顯的地域集中性和沿交通干線指向性。
  18. Horizontal directivity pattern

    水平方向性圖
  19. The length between each unit is 0. 16m, and the whole hydrophone is 0. 52m long. in a normal cistern, the directivity and sensitivity of the hydrophone is tested with an impulse method

    在非消聲水池中，用脈沖方法，採用測試信號頻率為4688hz ， 5度為間隔，測得其指向性。
  20. The al - di ( articulation index weighted - directivity index ), which is a measure for the improvement of the signal - to - noise ratio, is increased by about 30 percent for the trimictm technology. this corresponds to an improvement in speech intelligibility of up to 30 %

    研究亦顯示，在吵雜環境中，即語音與噪音的比率較差時，方向性麥克風對聽障者尤其有效，言語理解能力可提升至30 % ，使聽障者更容易與人交談。
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