propagation attenuation 中文意思是什麼

propagation attenuation 解釋
傳播衰減
  1. The vibration propagation is prodigious influenced by geological condition and the depth of tunnel. at last, linear method is carried to study the attenuation empirical formal of vl

    地質條件、隧道埋深對振動波的傳播影響較大，在離開隧道軸線一定距離存在一個振動放大區，在此區域內地面振動強度有所增大。
  2. When electrical parameter is changd by wet tunnel wall, electromagnetic wave propagation attenuation will vary

    摘要礦井隧道壁濕潤會引起電參數改變，從而使電磁波傳播衰減率發生變化。
  3. This paper is based on the theory of environmental science, systematology and noise control engineering. noise control system and comprehensive harness of fan room have been researched. by the investigate, and measure of fan room noise. sound production principle, acoustics characteristic and the law of attenuation propagation have been analyzed. thus, the sound field model of fan roo has been put for put forward ward

    本文以環境科學、系統科學和噪聲控制學為理論基礎，對風機房噪聲控制系統及其綜合治理進行研究，通過對風機房噪聲污染調查監測，分析其發生機理、聲學特性和傳播過程衰減規律。
  4. In this paper the train running noise level has been predicted with the theory of point sound source. the sound exposure level of a train set pass, equivalent continuous sound level and maximum sound level of a train set pass has been taken as estimate values, and some kinds of affixation attenuation on the course of noise propagation is considered, then the corresponding visual software has been developed. these make it convenient and precise to predict the noise level

    本文從點聲源的理論出發，對列車運行噪聲進行預測計算，採用一列車通過時的單發暴露聲級、時間特性的最大聲壓級和一定時間內的等效聲級等作為噪聲評價量，並考慮了噪聲傳播過程中的各種附加衰減，編制了相應的可視化軟體，使噪聲預測計算方便、準確。
  5. Based on the resolving algorithm of continuous - layer method, the time order analyzing curves, acceleration curves and the response spectra of transfer function at the different points of the ground and at the same point on the different ground conditions are gained. it demonstrates that the responses of ground in x, y and z axial directions all change by time, and the obvious wave propagation appears in ground. for different observing points on the same ground condition, at more distant points from the load line, the less swings are found, that is to say, vibration possesses the obvious characteristic of attenuation

    基於分層法的解析演算法，得到了在不同點以及在同一點但不同地質條件下的時程分析曲線、加速度變化曲線和傳遞函數反應譜，結果表明，地基土在x 、 y 、 z三個方向的響應都是隨時間變化的，並且伴隨有明顯的波動現象產生；對于相同地質條件的不同觀察點，距離荷載作用線越遠的地方振幅越小，即振動具有明顯的衰減性。
  6. Numerical analysis of plane explosive wave propagation with its attenuation behavior in semi - infinite medium

    平面爆炸波在半無限混凝土介質中傳播與衰減特性的數值分析
  7. Firstly, the characteristics of radiation propagation and attenuation in the atmosphere, and the power response of a contrast - limited optoelectic system are analyzed, the apparent contrast model of a target is developed, and the detection range equation dependent on the aerosol extinction coefficient and range parameter are derived

    首先，分析了紅外波段大氣輻射傳輸與衰減、對比度限制光電成像系統功率響應特性，建立了目標表現觀對比度模型，並推導出了由氣溶膠消光系數和距離參量確定的探測距離方程。
  8. According to structural characteristics of multi - phased alloy steels and the properties of ultrasonic propagation, microstructures characterization with different heat treatment processes ( normalizing, quenching / annealing, quenching plus low tempering, quenching plus high tempering ) for three steels ( 40cr, 38crmoal, gcrlssimn ) was studied experimentally by using ultrasonic methods. ultrasonic velocity, relative attenuation coefficient, and power spectral analyses were researched on the same samples respectively, on the basis of theory and experiment, the sensitivity and other characterizations of the three methods used to distinguish different microstructures were compared

    根據具有多種相結構合金鋼不同熱處理轉變產物的組織特點，以及超聲波在其中的傳播規律，利用超聲波速度、相對衰減系數以及功率譜分析三種方法，對三種鋼（ 40cr 、 38crmoal及gcr15simn ）不同熱處理（正火、淬火退火、淬火+低溫回火及淬火+高溫回火）轉變產物的顯微組織進行了超聲表徵研究。
  9. Attenuation characteristic of fast wave, slow wave, quasi - transverse wave and anti - plane transverse wave are discussed and the combined effects of the anisotropy of the solid skeleton and fluid viscosity on the propagation characteristic of plane waves are analyzed numerically. the influence of horizontal anisotropy and fluid viscosity on the propagation characteristic of elastic waves is clarified

    討論了液飽和多孔介質中快波、慢波，準剪切波和反平面剪切波的衰減特性，並分析了固體骨架異性以及流體粘度的綜合效應對平面波傳播特性的作用，澄清了介質水平面內異性以及流體粘度對彈性波傳播特性的影響。
  10. Laws of propagation and attenuation of spherical stress wave in the geologic media have been studied in detail by means of mini - chemical explosion test in laboratory in this paper. the lows are fundamental to improve and develop theoretic models for underground explosions ( tamped and cavity decoupled ) on the stress wave propagation, safety and containment during the explosion

    運用微型藥量化爆模擬試驗可以比較深入、細致地研究地質介質中球形發散應力波的傳播、衰減規律，這對于改進、發展用於估算地下爆炸（填實和空腔解耦）應力波的傳播及安全封閉的理論計算模型是至關重要的基礎資料。
  11. The general attenuation law of ground vibration caused by heavy tamping is verified by spectrum analysis in this paper. moreover, the relationship between attenuation index and standard penetration number is created through combination analysis of vibration attenuation and surface wave propagation

    在此基礎上，通過面波分析，得出了場地介質衰減指數和表徵場地介質性質的參數?標準貫入擊數之間的關系，給出了表達式的一般形式。
  12. In this paper, the propagation, the regulations of vibration attenuation are studied by both in situ experimental and simulation method, based on the observed data of the first and second line in a subway

    本文以某地鐵一號線、二號線振動測試數據為基礎，從實測和數值模擬兩個方面對振動的傳播規律進行了研究。
  13. Second, the mode fields of a strip waveguide and some slab waveguides have been simulated by applying finite - difference time - domain ( fdtd ) method. the curvature radius ; vicinity coupling ; transition loss and power attenuation of a s - shape bend waveguide have been analysed numerically by employing wide angle finite - difference beam propagation method ( fd - bpm ), as well as the coupling loss of optical fiber and waveguide. in addition, the framework of the s - shape waveguide laser has been

    其次，應用時域有限差分法，結合波導模式理論對條形與平面波導進行了模場模擬;應用廣角有限差分光束傳播法，對s形彎曲波導的曲率半徑、鄰近耦合、過渡損耗、功率衰減以及波導與光纖的各種耦合損耗進行了數值分析，並在此基礎上，對s形波導激光器的結構作了初步設計。
  14. From the point of kinematics and dynamics, the author analyses the propagation rules of stress waves in concrete, namely time - space relations, wave amplitude attenuation, dispersion effect and characteristics of transmission of reflected waves and acoustic waves. combining with engineering practices, the author also concluded the main points of low strain detection of integrity of longdiameter underwater cast - in - situ piles, and pointed out that comprehensive and relational utilization of reflected waves method and acoustic wave transmission method can accurately evaluated the integrity of pile shaft and then improve the reliability of detection. 6figs., 3refs

    從運動學和動力學角度，分析應力波在混凝土中的傳播規律：時空關系、波幅衰減、頻散作用以及反射波與聲波透射的特點，結合工程實踐，總結大直徑水下灌注樁低應變檢測的工作要點，指出綜合、合理運用反射波法與聲波透射法，可以較準確地評價樁身完整性，提高檢測結果的可靠性.圖6 ，參3
  15. Based on the technical difficulties in data acquisition, processing and interpretation, especially the difficulties in acquisition stage, combined with the feasibility and present situation in acquisition technology research, started from wave propagation theory, this article studies the absorption and attenuation of the effective wave and gets three basic recognitions

    本文較全面分析了深層地震勘探枝術從資料採集、數據處理、資料解釋中存在的技術難點，突出了原始資料採集中的困難，結合開展深層地震勘探技術研究的可行性和發展現狀，從波的傳播規律入手，通過理論模型計算，研究了有效波傳播的吸收與衰減問題，取得了三點基本認識。
  16. Based on the radio waves propagation models of circular tunnels and rectangular tunnels, the relation between attenuation and conductivity is analyzed and the concept of conductivity breakpoint is presented

    根據圓形巷道和矩形巷道的電波傳播模型，分析了電波衰減率和電導率的關系，並且提出了電導率斷點的概念。
  17. With these three calculated parameters, the attenuation factor value of the radio wave propagation in the earth ' s crust is calculated by the ways of plane wave method and communication formula method, and the value of the leakage on the ground is also calculated by the inhomogeneous medium ' s field analysis method

    據此三種參數，利用平面波法和通信公式法計算出電波在地殼中傳播的衰減因子值，以及利用非均勻介質的場分析法計算出地面場強泄露衰減因子值。
  18. Acoustics - attenuation of sound during propagation outdoors - part 2 : general method of calculation

    聲學戶外聲傳播的衰減第2部分:一般計算方法
  19. Moreover, although the diversity degree is limited, the interference level is closed to ideal case ( ie., signal can received by all base stations ) and then capacity closed to isolated cell because of propagation attenuation especially in lower shadowing conditions

    此外，由於信號固有的傳播衰落，雖然分集度受限，但其基站所受干擾水平接近理想情形（移動臺信號被所有基站接收） ，進而容量接近孤立蜂窩的容量。
  20. Since there are only few papers about the topic, the simulating result have no alternative but to compare with the data of the upper inhomogeneous terrain. the similar trend is found for the two results, and larger propagation attenuation will follow the higher frequency or larger conductivity of the medium

    由於有關覆蓋層傳播方面的文獻資料幾乎沒有，所以只能把結果與地表均勻巖層的數據進行比較，結果表明平面波法和通信公式法計算得出的結果完全一致，並與在地表均勻巖層傳播結果趨勢類似，而且隨著頻率的增高或導電率的增大，傳播衰減也增大。
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