衰减

The other distinguishing factor to the quake was the firmness of the terrain in central China, which allowed seismic waves to travel large distances without losing their power, Tokyo University seismologist Teruyuki Kato said.

东经大学地震学家加藤照之说，与此次地震相关的另一个因素就是中原地区的坚硬地壳，这种地质能让震波能量毫不衰减地传播非常远的距离。

The result of GPR investigation in west Jilin shows that the radar waveform of saline-alkali soil is different from that of tillable soil, and this can be used to distinguish tillable soil from saline-alkali soil. The extent of salinization can be determined according to the relativity of spectra.

吉林西部盐碱地区的探地雷达调查表明，盐碱地与耕地土的雷达回波具有明显差别，根据振幅的衰减特征可以精确区分耕地与盐碱地，根据频谱中高频峰值与土壤有机质含量的相关性可定性评价土壤的盐碱化程度。

There is no way to differentiate among the various structures along the path, since attenuation is the total result of the tin/lead in solder, trace tinning, copper, and internal metal layers.

没有办法在各种各样的结构之中区分沿道路，因为衰减是锡或主角的总结果在焊剂、踪影装罐，铜和内部金属层数。

In view of the vast range of mountainous and hilly areas,a unique characteristic of Fujian topography,it especially analyses the effects of topograph on climate and soil nutrient storage.According to the mechanism of how the grain produtivity comes into being,this paper achieves the calculation of potential grain productivity in variou...

尤其针对福建山地丘陵面积大的特点，专门分析了地形因素对气候及土壤养分存贮状况的影响，根据作物生产力形成的机理，采用光、温、水、土逐项衰减的方法，计算了福建省各地以水稻为代表的粮食作物的土地生产潜力，并据此提出了发展福建粮食生产的相应建议。

In this paper a new recursive DFT is proposed based on sum-and-difference formula of trigonometrical function and solution of linear equations. Its computation work is nearly the same as that of traditional recursive DFT, but it can solve many problems effectively which can't be solved easily by traditional recursive DFT, such as algorithms for overcoming attenuation direct-current component part existing in power system.

文中基于三角函数的和差公式以及线性方程组的求解，提出了一种新的递推离散傅里叶变换算法，它的计算量与传统递推算法接近，但可以解决传统递推算法不易解决的许多问题，如适用于人们提出的克服电力系统中衰减直流分量对DFT影响的一些方法中，因而具有广阔的应用前景。

5 UCA for characterization is subject to the same limitations as other types of ultrasound, and sensitiity is markedly reduced in attenuating liers and deep lesions.

2.4.5。用UCA来鉴别诊断的局限性和其它类型的超声一样，其灵敏度在声衰减肝脏和深部病变时会显著下降。

One or more of said (8, 10) filters are arranged to add or drop at least two selected adjacent wavelength channels of the WDM optical signal whilst allowing the remainder of the channels within the WDM signal to pass substantially unattenuated.

将一个或多个所说的滤波器(8，10)配置成可以插入或分出WDM光信号中的至少两个选中的邻接波长信道，而允许WDM信号中的其余信道基本上不受衰减地通过。

Turning the knob fully counterclockwise allows the gate to pass signals unattenuated, effectively bypassing the gate.

逆时针旋转旋钮直到OFF，这样，允许信号毫无衰减地通过，有效地直通。

The fundamental principle is that the acoustic signal will be more attenuated in the presence of cement than if the casing were uncemented.

基本原理是声波信号在胶结存在时的衰减比胶结差时的要大。

Compared with uncoded system, the Turbo-coded optical wireless system improves the performance of optical wireless link because Turbo code compensates losses and noises of link and improves jamming-rejection ca...

比较了基于Turbo码的大气无线光通信系统与未编码大气无线光通信系统，发现Turbo码技术能够很好地补偿和克服各种衰减和噪声，提高了系统的抗干扰能力，使系统的性能得到了很大的提高。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。