mass attenuation 中文意思是什麼

mass attenuation 解釋
質量衰減
  • mass : n 彌撒；彌撒的儀式[禱告、音樂]；彌撒曲。 a high [solemn] Mass （有燒香、奏樂等的）大彌撒。 a low ...
  • attenuation : n. 1. 變薄，變細。2. 減少，減弱。3. 稀釋。4. 【物理學】衰減。
  1. A calculation example is used to get some figure. the effect of phase shift and attenuation in temperature fluctuation by thermal mass can be observed in these figures. the cfd simulation of the similar modeling is carried out, the result of the cfd simulation is similar to the calculation example

    在前面工作的基礎上，本文作者還利用cfd軟體模擬了和前面模型中相似的情況，即只考慮室內蓄熱體的蓄熱作用，假設外圍護結構是絕熱的，得到的室內空氣溫度變化趨勢與算例所得到的是很相似的。
  2. Mass attenuation coefficient

    質量衰減系數
  3. A computed tomography scan of the neck revealed variously sized low attenuation cystic lesions involving the sublingual and submandibular space, with extension into the parapharyngeal space up to the base of the skull, causing a mass effect on the surrounding structures

    電腦斷層顯示許多低密度囊腫?滿了整個下頜間隙及舌下間隙，並延著側咽間隙向上延伸至顱底，造成對周圍組織的腫塊效應。
  4. Computed tomography ( ct ) scan demonstrated a large, well - defined retroperitoneal mass with heterogeneous attenuation appearance and areas of low density showing as fatty substance

    電腦斷層攝影發現一個巨大的腫瘤在後腹腔，邊綠清晰，內部呈現不同質的狀態，對注射造影劑后並無明顯的增強作用，而且含有脂肪的成份。
  5. 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。
  6. In order to eliminate the beam - hardening artifacts, most current correction algorithms have to assume that the x - ray beam spectra are known and the mass attenuation coefficients of the detected object related to different energy are given

    目前的多數射束硬化校正演算法需假設已知ct系統的x射線能譜，並已知構成被測物體的物質關于不同能量的光子的質量衰減系數。
  7. 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。
  8. The structural optimization based on noise attenuation is studied, in which the thickness of each link is taken as the design variable, and the weighting sum of structural mass and measure of the structural acoustic performance is taken as the synthesis performance index

    選取機構桿件厚度為設計變量，以機構質量和聲輻射性能量度的加權和為目標函數，應用改進了的變尺度優化演算法對優化問題進行了求解。
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