查询词典 attenuation

Results Bronchiectasis and areas of decreased attenuation ...

结果 支气管扩张和空气潴留分别在 98/ 198和 112 / 198个肺叶中见到，两者平均积分高度相关(r =0 。94；P 。0 0 1)。

The relationship between the Q value of ultrasonic resonant cavity and attenuation coefficient is educed for the first time,which supplies theoretic support to get the coefficient accurately by interferometry,and a practical method is introduced.

通过测量介质的声学特征量得到介质的某些理化常数的技术称为声探测技术。如测量液体的密度、浓度、粘度、流量、液位以及固体的致密度、晶粒度或球化率、弹性、硬度、厚度

Low attenuation coefficient and chromatic dispersion, insure cable's optics transmission characteristics .

低损耗，低色散，保证光缆出色的光学传输性能

By analytic geometry method and solving quadratic equation,a computer simulation algorithm of digital projection under arbitrary scanning locus was proposed.The algorithm is based on the rules of attenuation of monochromatic X-rays.Through mathematical modeling and computer simulation,digital projections of ellipsoid and cylinder in circular and helix scanning modes are exemplified respectively,which are proved to be correct by FDK and PI-line reconstruction algorithms.

介绍了一种利用解析几何和求解二次方程仿真任意扫描轨迹下的锥束射线投影数据算法，该方法基于单色射线贯穿物体的衰减理论，通过数学建模与计算机仿真，给出了椭球、圆柱两种典型模型分别在单圆、螺旋线扫描轨迹下的投影数据仿真结果，并利用FDK和PI线重建算法进行验证，证明了该种数值仿真方法的正确性。

The finite element method is applied to analyze the attenuation performance, which is basing on that porous clapboard, porous pipes and absorbent are accurately modeled and the influence of temperature, velocity and tail reflection is taken into account.

采用有限元方法，在对穿孔隔板、穿孔管和吸声材料进行精确建模，并考虑温度、流速和尾管反射对消声的影响的基础上，对消声特性进行分析。

Attenuation measurements of coda and shear waves have been made by digital data recorded in Tengchong volcano area.

用云南腾冲火山地区观测的地震数字化记录进行了尾波和剪切波的衰减测量。

Both of them do not indicate anomaly features of coda attenuation in active volcano areas.

两者均未显示出活火山地区尾波衰减的异常特征。

In the water quality model,the attenuation coefficients of colligation are determined to be K...

北冲污水处理厂排放的"尾水"将是水污染治理的重点，也是改善桃花江水环境质量的关键。

This paper puts forward to a new way of generating colored noise using a novel all-filter phase digital filter. Compared to traditional FIR filter, the colored noise generated by using this filter has fewer spectrum leak, higher stop band attenuation.

本文提出用全相位数字滤波器这种新型滤波器滤波白噪声产生有色噪声的方法，这种方法比用传统FIR滤波器产生的有色噪声频谱泄漏少，阻带衰减功率大等优点。

A lens and a paraboloid nozzle were used to focus pulsed CO2 laser and generate impulse.Effects of single pulse energy on impulse coupling coefficient was studied with a high-accuracy compound pendulum and a light figure system.Extension range of pulse energy from 5 J to 70 J was obtained through adjusting working voltage of the laser and energy attenuation of silicon combinations in the experiment.

利用透镜聚焦，抛物面喷管约束，结合复摆和光指针测量系统研究了单脉冲能量对吸气式激光推进冲量耦合系数的影响，实验中通过调节激光器工作电压和硅片衰减实现了脉冲能量5-70 J范围的有效拓展；进一步采用纳秒分幅高速相机拍摄了24 J能量下的流场纹影照片。

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。