衰减系数

压力的增加将使P波尾波持续数时间增长，衰减系数α减小。

The coda continuous time was increased and the attenuation coefficient was decreased with the compression increase .

红毛丹组织X射线衰减系数与其密度的相关性

Application of X-ray Imaging in Analysis of Attenuation Coefficient for Rambutan Tissues

温度对污泥衰减系数b变化的影响并不大。

The temperature does not have great influence on sludge decay coefficient b.

从对数坐标图中求出该衰减系数或温度下降率α，得出α随P的变化规律。

By plotting the data in logarithmic coordinates , the attenuation coefficient or temperature decreasing rate a is obtained .

射束硬化是由X射线束能谱的多能性和衰减系数与能量的相关性造成的。

Beam-hardening is caused by polychromatic energy spectrum and energy dependency attenuation coefficient .

应用共振吸收谱仪测量Al对γ射线的衰减系数

The γ - ray attenuation coefficient of aluminium measured with a resonant absorption spectrometer

发现线性衰减系数与d和E成反比与ρ成正比，而侧边散射系数与d和E成正比但与ρ成反比。

P. The side scattering coefficient , ac , is directly proportional to both d and E.

CT装置用的是阵列式线形探测器。测出的线衰减系数是相对的，成像要求高分辨。

CT method uses array linear detectors to perform high-resolution tomography and yield relative image of linear attenuation coefficient .

目的：测量CT设备的CT值线性，评价物质材料的CT值（测量值）对其衰减系数μ是否满足线性关系。

Objective : To measure CT linearity and evaluate if it would show linear relationship between coefficient and attenuation .

△T的长短和序列总体的余震频度衰减系数（p）的大小有关。

△ T 's are related to the overall attenuation coefficient ( p ) of the aftershock frequency of the entire earthquake sequence .

本文介绍了一种测定透明薄膜衰减系数Kλ的方法。其要点是：1.测定透明薄膜的有效透过率τλ~；

In this paper a technique for measuring extinction coefficient K λ of transparent films is presented .

对余氯衰减系数的排列顺序为：k混凝土>k玻璃钢>k不锈钢>k陶瓷。

Attenuation coefficient of chlorine residual are : k concrete > k fiberglass > k stainless steel > k ceramic .

实验表明超声吸收衰减系数随频率f增大而增大，也随SiC体积比的增大而增大。

The value of absorbing attenuation coefficient increases with increasing of volume fraction of SiC and frequency f.

Rayleigh面波衰减系数γ计算。

Calculating of the Rayleigh Surface wave attenuation factor y. In the first step .

特别地，该算法在给出系统的X射线能谱估计的同时，还给出了构成模体的物质关于不同能量的光子的质量衰减系数的估计。

Especially , the algorithm obtains the phantom 's mass attenuation coefficient and spectrum of the CT system at the same time .

分析体积衰减系数c、辐照度衰减系数k、散射系数b和透明度盘深度（SDD）的关系。

The relations of SDD with beam attenuation coefficient c , irradiance attenuation coefficient K and scattering coefficient b are given .

汉江上游有机污染物COD（Cr）综合衰减系数的试验确定

Experimental study on integrated attenuation coefficient of organic contaminant ( COD_ ( Cr )) in upper reaches of Hanjiang River

提出在多闸坝河流上，利用枯水期断面化学需氧量同步监测数据测算COD综合衰减系数的方法。

A method to calculate the fall coefficient of COD in rivers which have many dams was put forward .

通过迭代法对弥散方程进行了数值计算，讨论了不同模态下的Love传播速度及衰减系数受到饱和度变化的影响情况。

The numerical analysis is carried out through an iterative process of dispersion equation and the influences of saturation change on the propagation velocity and attenuation coefficient are calculated and discussed .

本文应用可见光图像、X射线图像、X射线CT图像技术研究了红毛丹色泽、外形尺寸、果肉可食率、可溶性固形物及衰减系数。

The evaluation methods of color , defects , edible percentage and sugar contents of Rambutan flesh were studied using visible image , X-ray image and CT image .

提出了一种速度衰减系数α可预先确定的测量全预制和半预制破片群初速v＿0的电探针方法。

An electric probe measurement technique of the initial velocities for both preformed and fireformed fragment groupe with velocity attenuation coefficient (α) determined previously is presented .

铋元素具有比碘更高的原子序数，导致了它具有更高的x-射线衰减系数，在理论上能提高CT成像的对比度。

Bi with a higher atomic number than iodine is expected to have a higher X-ray absorption coefficient than iodine , and could theoretically cause greater contrast enhancement in CT imaging .

BaF2和BGO闪烁晶体对γ射线的线性衰减系数

The Linear Attenuation Coefficients of BaF_2 and BGO Scintillators for γ Rays

在σ≥120MPa以后，衰减系数、P波速度及Q值变化甚小。

At σ≥ 120 MPa and afterwards , the attenuation coefficient , P wave velocity and Q-value do not manifest significant changes .

谱衰减系数在－1，45-－2之间。最后，用PE算法，模拟计算在内波起主导作用下的声振幅起伏。

Spectrum attenuation coefficients are between-1.45 and-2 . At last , PE method is used to simulate the acoustic amplitude fluctuation , in which internal waves are the important element .

电脑断层摄影所产生的CT读数（与诊断X射线的线性衰减系数有关）可以反映相关组织的电子密度。

The basic yields of a CT scan , the CT numbers , are related to the attenuation coefficient of the diagnostic X-rays , actually reflect the electron densities of the individual tissue concerned .

由于β射线是连续能谱，不像单能X、γ射线那样有现成的质量衰减系数可查，必须由实验通过刻度来确定。

But not like the X-ray , γ - ray or single-energy electron , there is not existing coefficient to be refered , so it must be obtained by calibration in the experiment .

得到了脉动风空间相干函数中指数衰减系数Cz的风洞试验结果。

Exponential decay coefficient Cz in coherence function of fluctuating wind velocity is obtained from wind tunnel test .

从缩短信道时延扩展的角度出发，研究了Rake接收机的部分信道均衡能力，并推导出了Rake接收机均衡性能与Rake接收机的复杂度和信道衰减系数之间的关系；

Rake receiver was analyzed for its performance of channel shortening by deriving the delay spread of an equivalent channel after maximal-ratio combination .

该算法利用从各方向测量出来的投影值求出物体内部受检断面各点的X射线衰减系数，从而重建出整个人体横截面的图像。

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 .