查询词典 attenuation factor

Moreover, using two-dimension model, the vibration attenuation law of free field in thick-layered soft soil is analyzed, and the soil scopes requiring consider by various limit criterions is obtained for building.

利用二维模型分析了厚层软土情况地铁环境振动的自由场衰减规律，得出建筑在不同振动限值标准情况下需要考虑振动影响的范围。

This research was conducted to use Gamma ray attenuation method to measure sediment concentration and to use water level change rate to determine flow rate.

本研究利用γ射线衰减原理测量含沙量、采用水位随时间的变化测定流量。

Simulative experiments were done and it was found in a certain range of mass thickness, the attenuation rule of X-ray was like that of the single energy gamma ray.

将它用作物质的透射模拟实验，发现在一定厚度范围内，它与某单能光子的强度减弱规律相同而等效。

As a result, there is less attenuation of the gamma rays from the fission products.

这样一来，从裂变产物中发射出来的γ射线的减弱就要少一些。

With the increasing of metal wire radius, the group velocity and attenuation amplitude decrease.

采用高介电常数的金属可提高金属丝波导的传输性能。

Make research on the reaction of bulk solid to silo wall and to attenuation of silo structure while the dynamic response of silo models to foundation's simple harmonic motion is calculated.

在计算筒仓模型对地基简谐运动的动力响应时，研究了散体对仓体的作用及散体对仓体的减振作用。

Theoretical analysis and experimental results show that the fundamental suppression ratio is more than 94dB and the harmonic attenuation ratio is no more than 5%.

理论分析和实验表明，电路的基波抑制度可达94dB以上，谐波衰减率不大于5%。

In order to optimize performances of shunt active power filter of harmonic compensation, attenuation ratio for switching ripple, stability and power losses, an improved LCL filter topology was presented based on the analysis of the frequency characteristics of the LCL filter, in which a switching-ripple shunt branch and a series-inductor were adopted to the damping resistor to reduce the power losses dramatically.

为了使并联有源滤波器谐波电流补偿性能、开关纹波衰减率、系统稳定性和功率损耗等方面性能得到系统的折中和优化，提出了一种改进型LCL滤波器拓扑，该结构充分利用了LCL滤波器的频率特性，在阻尼电阻两端引入开关纹波谐振分流支路，同时在阻尼电阻上串联一小电感，有效的减少了阻尼电阻的损耗而不改变系统的静态和动态性能。

Objective To investigate the resistance of the natural housefly population to the chemical insecticides and their natural attenuation trend in the laboratory environment, and to provide the rational for the management of the resistance.

目的 研究家蝇自然种群对化学杀虫剂的抗药性现状及其在实验室环境下抗性自然衰减的变化趋势，为抗性治理提供理论依据。

Based on Huygens' principle, the basic equations in the ideal medium and the theory of field diffraction, the paper gives theoretical studies of ANC in space, including the mechanism of attenuation of noise, basic characteristics of radiation and the way of energy transfer.

本文从Huygens原理、理想媒质中的基本方程和场衍射理论出发，对空间有源消声的基本理论进行了探讨，分析了次级声源的消声原理、基本辐射特性和能量转换，提出了空间有源消声所减小的声能主要通过次级声源和初级声源本身转换成其它形式的能量的思想，并在实验上进行了验证。

So it was last week in Selma , alabama.

上星期在亚拉巴马州塞尔马市发生的事件也是这样一个转折点。

The group also spearheads various social programs in China.

该组织还带头参与中国的各种社会活动。