查询词典 attenuation

The effects of mesh density on the accuracy of simulation and the effects of wave frequency on wave velocity and attenuation in grouted bolts were analyzed.

同时分析了采用有限元模拟锚杆中传播的导波时网格密度对模拟结果精度的影响。

Patchy ground-glass attenuation with thickening of bronchovascular markings were the main findings in high resolusion computed tomography of all three cases.Small areas of consolidation in two cases and traction bronchiectasis in one were found while there was no honeycombing.

胸部高分辨CT均以片状磨玻璃样变为主要表现，伴有支气管血管纹理增厚，2例有小片状实变影，1例有牵引性支气管扩张，未见蜂窝样变。

Telomerase activation is a key tumor marker which immortalizes cell.If a medicine blocks telomere prolonging by attenuation of telomerase activity, it could inhibit tumor cells proliferation.

因为端粒酶活化是大多数肿瘤细胞维持端粒长度并获得永生化的必要条件，如果某种药物能抑制端粒酶的活性就可阻断端粒的合成，从而使细胞退出增殖周期，达到抑制肿瘤细胞增殖的目的。

But the noises, the attenuation and the multipath propagation inhering in the powerline make it very difficult to realize such kind of communication system.

但是电力线信道上存在的各种噪声、衰减和多径传播等问题，这些都大大提高了通信的难度。

Results three different CT patterns were observed,a target lesion,a reniform mass,a sausage shaped mass,with a lower attenuation centrally,representing the intussuscepted mesentery.

结果 10 例CT扫描均可见多层靶环形、肾形或香肠形软组织影，中央部为脂肪和血管轴面影。2 例淋巴瘤多处可见肿大融合的淋巴结及肠壁不规则增厚，肠腔内造影剂充盈不均，1 例术中发现肠系膜过长而引起Tret's 韧带疝。

When sound wave irradiates suspension layer, there is propagation attenuation in the layer besides reflection and transmission in the interface.

声波照射到悬浮层上，除界面处产生反射和透射外，在层中传播还会产生衰减。

We can see from the numerical results of the improved exhaust system in acoustic and fluid fields that: the improved design succeeds in increasing the attenuation performance and reducing the pressure loss and meliorating the aerodynamic quality.

改进后的流场和声场分析结果表明：改进设计使得排气系统的空气动力特性、低频、高频消声特性等方面都较原结构有所改善，达到了预期改进目标。

After comparing nonlinear simulation with linear, the results indicate that: Weak nonlinearity has definite and apparent influence on the distribution of acoustic fields and focused gain of array, which cause the distribution of waveform is closer to the array and the focused gain deteriorate ; the strong nonlinearity have a strong waveform aberration, because the other waves of non-fundamental frequency appear . No evident distinction is found in the effects between the oblique propagation and the vertical propagation, though less focused gain and influence caused by strong nonlinear produced by the acoustic diffraction which results in more attenuation in terms of oblique propagation.

将线性条件下的模拟结果与非线性条件下的模拟结果进行比较发现：弱非线性会对声场的分布和阵列聚焦增益产生一定的影响，使得声场分布波形比线性条件下的更加靠近阵列，聚焦效果变差；强非线性会使波形发生更严重畸变，这是由于产生了基频以外的其他频率声波引起的；非线性对斜向传播时声场分布的影响与垂直传播时的影响效果基本相同，但由于斜向辐射时的声波衍射造成的衰减要大于垂直辐射时的，因此聚焦增益和强非线性的影响都将小于垂直辐射时的情况。

An earthquake nucleates and happens not only as a result of increments and changes in back ground tectonic stress field, but also as a result of stress changes in the focal region, so seismic wave velocity and attenuation contain information on stress changes of the Earth's interior as a result of changes in the physical state of materials.

地震的孕育和发生除了与区域背景构造应力的增长变动有关，也是震源区应力增长及破裂发展的结果。因此地震观测资料必然携带有震源区应力应变增长及破裂发展的信息。

The main contents include bringing and characters of X-ray, and offects when it acts to substance. After the attenuation law of X-ray which perforates substance and X-ray defects testing principle were analyzed. Influence factors of X-ray imaging sensitivity was disussed and effective restraining measures were brought forward.

主要内容包括X射线的产生、性质及它与物质相互作用时发生的各种效应；通过分析X射线穿过物质后衰减规律和射线探伤的原理，探讨了射线成像灵敏度的影响因素，并提出相应有效的抑制措施。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。