coefficient of attenuation 中文意思是什麼

coefficient of attenuation 解釋
衰減系數
  • coefficient : adj. 共同作用的。n. 1. 共同作用；協同因素。2. 【數，物】系數，率；程度。
  • of : OF ＝Old French 古法語。
  • attenuation : n. 1. 變薄，變細。2. 減少，減弱。3. 稀釋。4. 【物理學】衰減。
  1. The inversion of non - elasticity attenuation coefficient, source parameters an

    利用井下數字地震記錄反演非彈性衰減系數震源參數和場地響應
  2. Method for measurement of ultrasonic attenuation coefficient of solid by pulse echo technique

    用脈沖回波技術測量固體超聲波衰減系數的檢測方法
  3. Test method for measuring the package attenuation coefficient of a sealed device for radioisotope hermetic test

    放射性同位素密封試驗用封裝器件封殼衰減系數的測量方法
  4. Therefore, the judgment presented here is according to the attenuation coefficient and number of the bottom wave

    因此，本文提出的判斷依據是底波的衰減系數和底波的個數。
  5. This method overcomes the difficult and unrealizable experiment conditions that are used to measure the absolute attenuation coefficient and impels the technique of ultrasonic characterization to be more closed to the engineering requirements and more practical

    該方法克服了絕對衰減系數測定法對實驗條件要求極為苛刻、難以實現的不足，使得超聲表徵技術更接近工程條件、更具實用價值。
  6. 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。
  7. The difference among the elasticity modulus of various microstructures is probably the main reason, which caused the experiment results above. under the same experiment conditions, such as sample shape, size, surface roughness, establishment of testing system, pressure on the probe, and thickness of coupling medium, the variety of relative attenuation coefficient ( or ) in different heat treatment samples is measured and compared by measuring the attenuation obtained from the cylindrical surface of column. the result is as following : for 40cr and 38crmoal, a mt < az mq < a s < a p + f ; for gcrlssimn, a mt < a annea < s < a p + f ; and a increased with the increasing of frequency

    在保證試樣形狀、尺寸、表面光潔度、系統參數設置、施加在探頭上的壓力以及耦合層厚度等測試條件一致的情況下，利用棒材圓柱面測衰減系數法，分別測定並比較上述不同熱處理試樣相對衰減系數的變化情況，得到的實驗結果是：對於40cr及38crmoal鋼， _ （低溫回火） （淬火） _ （高溫回火） _ （正火） ；對于gcr15simn鋼， _ （低溫回火） _ （退火） _ （高溫回火） _ （正火） ；且隨著頻率的提高，衰減系數均呈現增加的趨勢。
  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. Test methods for communication cable - test for frequency characteristic of attenuation coefficient of coaxial pair - comparison method

    通信電纜試驗方法同軸對衰減常數頻率特性試驗比較法
  10. ( c ) land natural productivity increase from 7843 kg / ( hm2 - a ) to 17335 kg / ( hm2 - a ) relate to altitude closely, and the mean rate of enhancing yield is 23. 53 percent in this region with annual enhancing - rate of 0. 64 percent in last 15 years. ( d ) there are many facters that have been influe ncing soil effective coefficient that ' s soil organic matter, total nitrogen, effective phosphine and soil texture in turn. in a word, attenuation cause of land productivity is the result of water and soil. ( e ) the forestland potential productivity change from 3986 kg / hm2 to 15034 kg / hm2, but it has a high distinction between southern aera and north area in yaan city. ( f ) the grassland potential productivity increase from 4085 kg / ( hm2 - a ) to 16973 kg / ( hm2 - a ), but it has a high classification of potential productivity, ( g ) ditribution map was formed of potential land productivity. ( h ) it could be act as decision support for agriculture development, national land planning and ecotop constructive, etc

    5 、土地自然生產潛力水平的主要土壤限制因素為有機質、全氮，其次為速效磷和土壤質地；區域潛在生產力差異的制約因素，主要為土壤，次為水分，水、土兩項衰減合計為45 . 99 ，石棉、漢源兩縣水、土衰減達到60左右。 6 、林地潛力在3986 15034kg / hm ~ 2之間，高等級林地比重小，以大相嶺為界，北部的各縣林地生產力水平高，南部的兩縣林地生產力水平較低。 7 、天然草地生產潛力水平高，潛力在16973 4085kg / （ hm ~ 2 ? a ）之間，以高產的一、二、三級草地為主，且近10年來該比例變化不大。
  11. For example, the quenching and quenching plus low tempered structure of 38crmoal are hard to be differentiated by velocity method and the principal frequency technique. it will be better if they are differentiated by the method of relative attenuation coefficient

    38crmoal鋼的淬火與淬火+低溫回火組織，用聲速法和主頻率比較法都難以區分，最好的方法是比較功率譜譜峰特徵（幅度、數量、分佈） 。
  12. This algorithm uses the profiles collected from a number of angles to compute the x - ray attenuation coefficient of a cross section inside the body, then reconstruct the image of the cross section

    該演算法利用從各方向測量出來的投影值求出物體內部受檢斷面各點的x射線衰減系數，從而重建出整個人體橫截面的圖像。
  13. Ct method uses array linear detectors to perform high - resolution tomography and yield relative image of linear attenuation coefficient

    測出的線衰減系數是相對的，成像要求高分辨。 tgs裝置用的是同軸大體積hpge探測器。
  14. Especially, the algorithm obtains the phantom ' s mass attenuation coefficient and spectrum of the ct system at the same time

    特別地，該演算法在給出系統的x射線能譜估計的同時，還給出了構成模體的物質關于不同能量的光子的質量衰減系數的估計。
  15. Firstly, an estimation algorithm for spectrum of the ct system is presented in the paper by using a standard cylinder or wedge phantom, where the mass attenuation coefficient of the contained material of the phantom is not necessarily to be known

    本文首先給出了由標準均勻圓柱狀模體或楔狀模體估計ct系統的x射線能譜的演算法，該演算法不必已知構成模體的物質關于不同能量的光子的質量衰減系數。
  16. To investigate the influence of transmission attenuation of seismic waves in a layer - cake model, the authors formulated a seismic convolution model by considering the coefficient of transmission attenuation, and then provided a new forward algorithm for the model - based seismic inversion of impedance

    摘要研究了地震波在層狀地質模型內透射衰減對地震反射信號振幅的影響，給出了含透射衰減的褶積模型，為基於模型的波阻抗反演提供了一種新的正演方法。
  17. Any homogeneous viscoelastic medium subjected to one - dimensional tension and compression can be characterized in terms of the phase velocity c ( w ) and the attenuation coefficient deduce the complex modulus and the other equivalent viscoelastic functions

    一維的縱向壓縮波在同質的粘彈性介質中傳播時，材料的粘彈性特性主要通過縱向波的傳播速度c （ w ）和衰減系數a （ w ）兩項來定義。
  18. Acoustics - methods for measuring the longitudinal sound speed and attenuation coefficient of rubbers and plastics in the frequency range 1mhz to 10mhz

    聲學1 10mhz頻率范圍內橡膠和塑料縱波聲速與衰減系數的測量方法
  19. According to the test results from 18mm - thick - steel plate adhering to concrete, gas and oil, the obvious differences in the attenuation coefficient and number of bottom waves are found. the test results shows that it is feasible to adopt ultrasonic longitudinal wave reflection method to test the bonding quality of the steel and

    採用超聲縱波反射法單面檢測鋼-混凝土的粘結質量是可行的，採用底波衰減系數和底面反射波的個數作為判定鋼-混凝土的粘結質量依據是有效的，所採用的理論分析模型是正確的。
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