查询词典 attenuation coeffcient

It has been proved, that the attenuation value of bridge circuit is not equal to the sum of two terminal attenuation, and it concerned with impedance of wave trap, substation bus impedance, and phase-angle of...

分析和计算表明，桥路衰减的数值不能简单地看作两个终端衰减之和，而与阻波器阻抗、线路阻抗、变电站母线阻抗和邻相同频寄生信号的相位角等参数有关。

In order to obtain the environmental vibration's characteristics of attenuation with distance and that of frequency in test study, a good many of tests is carried out on propagation and attenuation of environmental vibration for typical zone of the Pearl Line.

在实测研究方面，为得到高架轨道交通引起环境振动的距离衰减规律以及振动衰减的频率特性等，针对上海市明珠线高架轨道交通的典型线路区段，进行了大量环境振动实测及其传播和衰减规律研究。

Based on the measurement of chromophoric dissolvable organic matter in 22 shallow lakes in the middle and lower reaches of Yangtze River, the attenuation of ultraviolet radiation in the lakes in the middle and lower reaches of Yangtze River and corresponding penetrating depth were estimated using empirical models; and checked up utilizing the field measured attenuation of ultraviolet radiation in Lake Donghu Wuhan.

基于对长江中下游22个浅水湖泊有色可溶性有机物吸收的测量，运用经验模式估算了紫外辐射在长江中下游湖泊的衰减及对应的穿透深度，并利用在武汉东湖实测的紫外辐射衰减进行了检验。

Results High dense renal cyst is usually homogeneous hypoechogenicity on sonograms and homogeneous high/iso attenuation on CT images and color doppler is helpful in diagnosing.Atypical angiomyolipoma usually shows homogeneous high attenuation on unenhanced CT images,homogeneous enhancement on enhanced CT and homogeneous isoechogenicity on sonograms.The CT features of Xanthogranulomatous pyelonephritisinclude multiple,rounded,low density areas with enhancing rings arranged in a hydronephrotic pattern known as bear paw sign.Acute focal bacterial nephritisshows wedge lesion and stripe sign on delayed enhanced CT images.

结果 高密度肾囊肿常表现为B超均匀低回声，CT均质或高密度灶，彩色多普勒超声有助诊断；不典型肾血管肌脂瘤常表现为B超均匀回声，CT平扫均质高密度且均匀强化；黄色肉芽肿性肾盂肾炎的特征是CT示群集的类圆形的低密度区以及环形增强带形成&熊掌征&；急性局限性细菌性肾炎的CT延时增强扫描以及动态观察显示楔形病灶以及条纹征，并随治疗逐渐消退。

The result makes clear, 2 class give urban sewage plant on the molecular quantity interval that organic owner should center the dissolvability in water water in kDa, and the content of organic matter compares hydrophoby the element of content big; of organic matter measures hydrophily interval distributings different organic thing shows water to accept filter film flux and hold back rate having distinct effect, the organic matter under molecular quantity 2kDa causes accept filter film to appear water flux attenuation bigger, organic matter is held back rate is minor, the organic matter that amounts to 57.2%; element to measure 10 ～ 100kDa causes accept filter film to appear water flux attenuation gentlier, organic matter is held back rate is older however highest the organic matter that amounts to 73.8%; to kiss scanty sex to differ shows water to accept filter film flux and hold back rate having distinct effect, classics is right of velar surface obstruction determine, confirm cause film to appear water flux and the main material that hold back rate change to be hydrophoby material, and the change that hydrophily material causes is minor.

结果表明，城市污水厂二级出水水中的溶解性有机物主要集中在kDa的分子量区间上，且疏水性有机物的含量比亲水性有机物的含量大；分子量区间分布不同的有机物对纳滤膜透水通量和截留率有着不同的影响，分子量2kDa以下的有机物引起纳滤膜透水通量衰减较大，有机物截留率较小，达57.2%；分子量10～100kDa的有机物引起纳滤膜透水通量衰减较平缓，有机物截留率却较大最高达73.8%；亲疏性不同的有机物对纳滤膜透水通量和截留率有着不同的影响，经对膜表面阻力的测定，证实引起膜透水通量和截留率变化的主要物质为疏水性物质，而亲水性物质引起的变化较小。

The correlation between signal attenuation and moisture absorption of the cable is studied,and a measurement method for cable moistureproof performance by using transmission attenuation is proposed.

研究了信号衰减与电缆吸潮的相关关系，提出以传输衰减表征线缆防潮性能的测量方法；安排了正交试验，并对试验结果及诸影响因素进行了讨论，提出了绝缘芯线外层的防潮措施。

In conventional seismic data processing, the earth is regarded as prefectly elastic medium.However,the pores of stratum rock often contain fluid. So, when the seismic wave propagates in it, there are energy attenuation and phase distortion related to frequency. Moreover, the attenuation, scattering,and dispersion of high-frequency components are far higher than that of low-frequency components.

常规地震资料处理中把大地看成是完全弹性介质，实际上，地层岩石孔隙中常常含有流体，当地震波在其中传播时要发生与频率相关的能量衰减和相位畸变，且高频成分的衰减、散射和弥散远高于低频成分。

Results:11 cases of angiomyolipoma manifested as a solitary renal mass on unenhanced ct, 6 cases of masses appeared as homogeneous attenuation, while 5 cases of tumors as heterogeneous attenuation.

对11例手术病理证实的乏脂肪aml的螺旋ct及临床表现进行回顾分析。结果：11例均为单发肿块，平扫表现密度均匀者6例，不均匀者5例。

Attenuation The trp operon is also controlled by attenuation A leader sequence in the polycistronic mRNA upsteam of the coding region of the trpE structural gene encodes a 14 amino acid leader peptide including two tryptophan residues The RNA leader sequence can for several possible stem-loop secondary structures,one of which can act as a transcription terminator whilst a different stem-loop can act as an anti-terminator.

弱化作用 trp 操纵子也受到弱化作用的调控。在trpE结构基因编码区上游的多顺反子mRAN上有一段前导序列，可以编码一个含有14个氨基酸的前导肽，此肽中含有两个色氨酸残基。

HRCT scan showed peripheral area of ground-glass attenuation adjacent to subpleural honeycombing in one patient,and diffusely distributed ground-glass opacity in another patient.Two patients had received cortieosteroid treatment.For one patient, the symptoms improved, and ground-glass attenuation adjacent to subpleural honeycombing had almostly resolved.The other patient died of respiratory failure.

其中1例患者的双肺新出现的磨玻璃影，沿胸膜下蜂窝肺外周分布；另1例患者HRCT表现为新出现的磨玻璃影呈弥漫性分布。2例患者均接受激素治疗。1例患者气紧、咳嗽症状明显缓解，胸部HRCT的磨玻璃样影基本吸收；另1例患者死于呼吸衰竭。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。