查询词典 attenuation

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。

Based on those above, the paper discusses the importance of energy in solving nonlinear wave-motion problems, which is processed from four aspects: formation of hypocenter and shock wave, energy distribution on the interface, energy attenuation in the media, and interact among waves.

通过上述认识，提出了非线性波动问题中能量的重要性，然后分别从震源与冲击波的形成，界面处的能量分配，介质中能量的衰减，波的相互作用四个方面讨论了非线性波的能量问题。

In this paper the key points discussed were that, under the condition of a sharp hypsography of desert areas of Ordos basin, we used some new geophysical methods in the investigation of surface structure to obtain high accurate surface structure data and provide reliable scientific foundation for data acquisition and process; we dealt with the optimum coupling of surface geophones and the digital realization technique in desert areas, dug into a method of high frequency compensation according to attenuations by absorption near surface, adopted data processing and correction technique, solved high frequency attenuation and geophone coupling, eliminated the influences of sharply transverse fluctuation of hypsography in desert area on the seismic data, enhanced the fidelity and SNR of seismic section, and finally picked up more geologic information on the seismic profile and improved the precision of the lateral prediction for the reservoir beds.

本文旨在研究鄂尔多斯盆地沙漠区地表变化比较大的情况下，在表层结构调查中通过应用一些地球物理新方法，以获取高精度的表层结构数据，为资料采集和数据处理提供更科学的依据；研究在沙漠区地表检波器最佳耦合的方式与数字实现技术，研究通过近地表的吸收衰减规律进行高频补偿的方法，采用数据处理校正技术，解决高频吸收及检波器耦合，消除沙漠区表层横向剧烈变化对地震资料的影响，提高地震剖面的保真度和信噪比，从而使更多的地质信息能够从地震剖面中反映出来，提高储层横向预测的精度。

The result from model show ice layer growth speed axial attenuation is larger than radial.

模拟的结果表明冰层生长速度随时间衰减的幅度轴向大于径向。

Infrasound (0.0001-20Hz) is acoustic energy with characters of little attenuation and long distance during radiation, inaudibility, diffraction and resonance in some parameters.

次声波是频率为0.0001Hz-20Hz的声波，具有传播衰减小、传播距离远、易于衍射、一般听不到、达到一定参数可引发共振等特点。

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。