decreasing wave 中文意思是什麼

decreasing wave 解釋
衰減波
  • decreasing : 遞減
  • wave : n 〈美海軍〉女志願軍人〈見 WAVES 條〉。n 1 波浪；碎浪； 〈the wave（s）〉 〈詩〉海。2 波動；波狀...
  1. An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning, having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment

    嘯聲干擾一種由於諸如閃電等大氣干擾而產生的音頻電磁波，具有典型的逐漸減弱頻率的特徵，該頻減引起了檢波設備中調逐漸下降的嘯聲
  2. In wavelength conversion based on four - wave mixing ( fwm ) in soa, balance efficiency can be obtained in larger range when increasing saturation power of the optical amplifier and decreasing the saturation power of spectral hole burning and carrier heating

    而在基於soa的四波混頻（ fwm ）波長轉換中，在提高光放大器飽和功率的同時減小光譜燒孔（ shb ）和載流子加熱（ ch ）飽和功率可有效提高較大頻率間隔處的轉換效率，並保持其在較大頻率失諧范圍內的效率均衡。
  3. Based on it, a new kind of helix slow - wave structure named elliptical helix slow - wave structure used in helix traveling wave tubes has been detailedly investigated. by studying the rf characteristics of this slow - wave structure, it ’ s found that higher operation frequency and interaction impedance will be obtained by increasing the eccentricity of helix or decreasing it of the shield. meanwhile, great potential of improving system bandwidth has also been found if the eccentricity of helix or shield or the two are properly choosed

    本文對近幾十年大功率行波管的研究進展進行了簡單討論，並在此基礎上研究了一種可應用於螺旋線行波管的新型的螺旋線慢波結構，即橢圓螺旋線慢波結構，通過對該螺旋線高頻特性進行詳細分析，我們初步認為，選擇適當的螺旋線和屏蔽筒離心率，可以提高系統工作頻率，增加系統耦合阻抗，並且具有改善系統帶寬的潛力。
  4. At the same time, there are not many problems for the good wave shape, for example, yawp, outputting du / dt, torque impulse and so on. technology of frequency conversion had developed into an absolute technology. moreover, it is important in many fields, such as reasonable using resource of water, decreasing pollution of environment, saving electric sources, improving work condition, saving materials, reducing costs and improving output

    交流變頻調速技術的發展由於其地位的重要性，巳迅速發展成為一門獨立的技術、學科領域，它對合理利用水資源，減少環境污染，節約電能，改善工作條件，節省原材料，降低成本和提高產量等方面均起著十分重要的作用。
  5. In order of decreasing wavelength ( distance between successive wave crests ), electromagnetic radiation consists of radio waves, infrared rays, visible light, ultraviolet rays, x rays, and gamma rays

    按照波長（兩個相鄰波峰間的長度）漸小的順序排列，電磁輻射由這樣一些輻射波組成，紅外線、可見光、紫外線、 x射線和伽瑪射線。
  6. Secondly, the optimum blast parameters of each parts of open pit and spreading law of the wave of blasting vibration on the east of open pit was studied. furthermore, the paper presented the method of decreasing blasting ground vibration as follows. 1

    通過大規模的現場試驗和爆破震動測試，得出了銅山口銅礦露天采場各區段的優化爆破參數以及生產爆破產生的地震波在東幫的傳播規律，在此基礎上提出了降震措施並得出如下主要結論： 1
  7. 3 ) from the samples saturated completely by air to those saturated completely by brine, the velocities of compressive wave of the rocks increase obviously, with the extent of 11. 73 % ; the velocities of shear wave change little or decrease slightly, with the average of decreasing extent of 1. 21 % for shear wave 1 and 1. 16 % for shear wave 2. the difference of velocity between compressive wave and shear wave makes poisson ' s ratio increase obviously, with the average extent of 87. 25 %

    3 ）從完全飽和氣到完全飽和水，珠江口盆地第三系砂巖、粉砂巖、碳酸鹽巖及其過渡性巖石類型的縱波速度是顯著增加的，平均增加幅度為11 . 73 ；橫波速度變化很小，或略有降低，橫波1平均降低幅度為1 . 21 ，橫波2平均降低幅度為1 . 16 ；縱橫波速度的這種差異變化導致泊松比顯著增加，平均增加幅度為87 . 25 。
  8. The obtained results indicate that compared with the clay layer, the liquefied sand layer takes a decreasing effects on the short period component of the surface ground motion and the effects increase with increasing of the thickness 、 depth and width of the liquefied sand layer ; the liquefied sand layer takes a increasing effects on the long period component of the surface ground motion but the effect is not obviously ; to the input earthquake wave, the demarcation point of strengthens and weaken is about 0. 6s

    主要結論為:和同樣的粘土層相比，液化層的存在對地表上地震動的短周期分量主要起減弱作用，且減震效果隨著液化層埋深、厚度的增加而變強;對長周期分量主要起加強作用，但是效果不太明顯;對所輸入的地震波來說加強減弱的分界點所對應周期為0 . 6s左右。
  9. Finally, some important conclusions were drawn, that is, using distributed pzt transducers, ultrasonic guided waves are generated and received in a pipe. usually, there are many different modes of guided wave propagating in the pipe and these modes are generally dispersive, the specific exciting signal of a harming windowed toneburst with a central frequency of 70khz for decreasing the effect of dispersion was selected. and guided wave are generated using 16 distributed pzt transducers in a circumferential direction for suppressing flexural modes

    首先，對當前本課題研究領域的進展作出綜述，並簡要介紹與超聲導波技術相關的理論基礎；其次，建立了一套有效的實驗裝置，在此實驗裝置基礎上，重點研究了採用分散式pzt傳感器在管中激勵和接收特定模態超聲導波的方法：根據在管狀波導中傳播的超聲波具有頻散現象及多模態特徵，選擇具有單一頻率的特定信號激勵超聲導波，使其頻散最小；同時採用分散式傳感器抑制不同模態的波型。
  10. In this thesis, based on this kind of application, we made theoretical analysis and engineering practice on high - precision lfmcw and its signal processing millimeter wave broadband lfmcw radar has quite high theoretical range - precision and distance resolution, however, for the real radar system, the nonideal parameter of its transmitting signal, such as power fluctuation and the nonlinearity in frequency sweep, will result in the decreasing of the practical rang - precision and the distance resolution of radar

    本文基於這一應用對高精度lfmcw測距雷達及其信號處理進行了理論分析和工程實踐。毫米波寬帶lfmcw雷達具有很高的理論測距精度和距離分辨力，但對于實際的雷達系統，其發射信號的非理想參數-掃頻功率起伏和掃頻非線性，將使得雷達的實際測距精度和距離分辨力下降。
  11. With the input of a vibration acceleration history of subway train, a full dynamic analysis of soil - pile - structure is carried out. the propagation of vibration wave on the ground and vibration responses of the huge platform and the storied buildings are analyzed. some conclusions are drawn as follows : ( 1 ) with the increase of the distance to the vibration source, vibration intensity of the ground decreases ; ( 2 ) the vibration intensity of the ground in vertical direction is slightly larger than that in horizontal direction ; ( 3 ) with the increase of the distance to the vibration source, the situation that the vibration intensity of each building in horizontal direction is maximum at highest and lowest story whereas minimum at the middle story changes gradually to that decreasing with the height of building ; ( 4 ) in vertical direction, the vibration velocities and accelerations at the end points of each story of a building are the nominal identical, which indicates that the vertical vibration of them is unanimous ; ( 5 ) the vibration intensity in vertical direction of a building is larger than that in horizontal direction ; ( 6 ) increasing of the elasticity of track is an effective way to abate vibration of ground and buildings

    本文以北京地鐵八王墳車輛段地上超大結構（車輛段大平臺及其上的小區樓房）及其地基基礎為研究對象，在研究和分析有關資料的基礎上，用快速拉格朗日有限差分法軟體flac建立了二維數值分析模型，並以列車振動加速度時程作為模型輸入，進行了地基?樁基礎?地上結構的整體動力學分析，分析了地鐵列車運行產生的振動在地面的傳播規律及其對地上結構的影響，得到了如下結論： （ 1 ）隨著與地鐵線路距離的增大，地面的振動強度有減小的趨勢； （ 2 ）地面豎直方向的振動強度較之水平方向的略大； （ 3 ）隨著與振源距離的增大，在水平方向上，地上各幢樓房的振動強度由底層和頂層的最大、中間層的最小逐漸過渡到沿樓層增高而減小； （ 4 ）在豎直方向上，每幢樓各層端點的振動速度、加速度完全相同，表明樓房各層在豎直方向上的運動狀態一致； （ 5 ）各幢樓房豎直方向的振動強度比水平方向的大； （ 6 ）增加軌道彈性是減輕地面和地上建築振動的有效途徑。
  12. The results showed that the displacement of the surrounding rock of cavern evidently decreases with the increase of in - situ stress side pressure coefficient, as well as the decreasing rate of surrounding rock displacement of cavern with increasing at the condition of < 1 are significant larger than that of > 1 ; when < 1, the displacements of measured points in cavern increase then decrease with the increasing incident angle of shear wave, while, when > 1, the displacements decrease then increase with the increasing incident angle of shear wave, and the influence of incident angle on the displacements of measured points tends to decrease with the increasing in - situ stress side pressure coefficient

    分析結果表明，地震荷載作用下，硐室位移隨地應力側壓系數的增加明顯減小，地應力側壓系數< 1時的硐室位移量值隨側壓系數的變化幅度明顯大於地應力側壓系數> 1時的情況；當側壓系數< 1 ，隨剪切波入射角的變化，硐室測量點位移響應先增加后減小；而當側壓系數> 1 ，隨剪切波入射角的增加，硐室測點位移先減小后增加，同時隨地應力側壓系數的增加有減小的趨勢。
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