echo attenuation
英 [ˈekəʊ əˌtenjʊˈeɪʃn]
美 [ˈekoʊ əˌtenjʊˈeɪʃn]
网络 回声衰减; 反射衰减
双语例句
- The characteristic of typical breast cancer with configuration anomalism, peripheral hyperechoic, grit calcification and posterior echo attenuation.
结果典型乳腺癌声像特征为外形不规则，周围高回声环，砂粒样钙化，后方回声衰减等。 - Pulsed echo ultrasonoscope Express the factors resulting in the attenuation of acoustic waves.
回波反射式超声诊断仪请陈述导致超音波衰减的各项因素。 - Ultrasonic Density Meter Design Based on Ultrasonic Echo Attenuation Theory
基于超声波回波衰减理论的超声波浓度计设计 - The principles and detection methods of forward and backward echoes are introduced. The relation between the key parameters and the restoration rate is analyzed and simulated, such as delay time of echo, segment length and the attenuation coefficient.
介绍了前向-后向回声核的构成原理和倒谱检测方法，仿真并分析了系统关键参数对隐藏信息恢复率的影响，如延迟时间、分段长度、回声的衰减系数等。 - Echo pulse ratio and attenuation of ultrasound method for the measurement of concentration of suspended particles
回波脉冲比值与声衰减法测量悬浮颗粒浓度 - Occupation lesions of nonhomogeneous echo beside optic nerve and dominant acoustic attenuation were observed in 4 cases.
4例为视神经旁回声不均的占位病变，声衰减显著。 - Simulation experiment demonstrates that the satisfied echo attenuation is achieved and the computational complexity is greatly reduced by the algorithm.
模拟实验表明，采用这种算法，可以得到较好的回波衰减，大大降低计算复杂度。 - Radar echo pattern at attenuation wavelength for the three dimensional cloud model
三维云模式在衰减波长雷达上的回波图象 - Based on the mode of ultrasonic echo, this paper designs a frequency-dependent compensation filter to compensate the absorbed attenuation when the ultrasound transmits in a tissue.
在建立超声回波信号的数学模型的基础上，设计了频率补偿滤波器。有效补偿了超声传播过程中的吸收衰减； - The acoustic parameters include complex reflection and transmission coefficient ( echo reduction and insertion loss), attenuation coefficient, complex acoustic impedance and sound speed.
测量参数包括复反射系数（口声降低）、复透射系数（插入损失）、衰减系数、复声阻抗和纵波声速。 - Analysis of laser altimeter echo energy attenuation in atmosphere transfer medium
大气传输介质引起的激光测高仪回波能量衰减分析 - The results showed that ultrasonic scanning is very sensitive to the changes of the water content in lumbar intervertebral disk and could directly reflect the degree of LIDD according to the echo intensity, rear attenuation and light-ring display.
结果显示，超声波对腰椎间盘水含量变化非常敏感，能够根据盘内回声强度、后方衰减以及光环显示情况，直接反映腰椎间盘变性程度。 - Results The date of 2-D ultrasound have characteristic, such as tumour boundary, internal echo, calcification, attenuation.
结果乳腺癌的二维声像图表现，如肿块的边界，内部回声，钙化，衰减均有一定特征； - Based on a certain pattern, this paper discusses the design guide line and concrete implementation scheme of a general-purpose PD missile header target simulator. Some pivotal techniques are emphasized, including broad-band receiving, SSB modulation of video-frequency echo, and high precision power attenuation.
叙述了基于某型PD导引头的通用目标模拟器的设计思路和具体实现方案，着重介绍了系统中所应用的宽带接收、视频回波的单边带调制和高精度功率衰减技术。 - The echo is a multiple output signal attenuation through the channel attenuation and returned to the input received signal with frequency interference, conventional duplexers or filters can filter out the interference signal band work, work in the same frequency band Difficult to filter out signal interference.
这些回波是由输出信号经过多路衰减信道衰减后返回到输入端得到的同频干扰信号，传统的双工器或者滤波器可以滤除工作频带外的干扰信号，对工作频带中的同频干扰信号难以滤除。 - The size, edge, shape, internal echo, mass drive aspect ratio, pone attenuation and blood flow condition of the lesions were recorded. The nature of the breast lesions was analysed and judged.
并记录病灶的大小、形态、边缘、内部回声、肿块纵横经之比、后方衰减及血流情况，并对其进行综合分析来评价病灶的良恶性。 - Point target echo is studied. First, build the target models in ADS, which contains target information, including signal delay, amplitude attenuation, phase variation and Doppler shift. Let the radar transmit signals pass the target model, then the echo signals are simulated.
本文讨论点目标的回波信号，先在ADS软件中建立目标模型，该模型能够实现雷达发射信号延迟、幅度衰减、相位变化以及多普勒频移，最终模拟出目标回波信号。 - In this paper, the target echo intensity, propagation attenuation model and characteristics of target are simply analyzed. Both the detailed introduction of extended Kalman filtering and the nonlinear filtering algorithm are given.
对目标回波强度、传播衰减模型以及目标特性等做了简单分析，重点对单基地高频地波雷达中采用的扩展卡尔曼滤波这一非线性滤波算法作了详细介绍。 - Shunning steps of the section in the transmission line is needed to avoid the echo and attenuation of the wave.
为防止波的反射与衰减要尽量避免信号传输线路截面的突变。 - When land or sea-based radar tracking some low-flying targets, it will always be some echo signal multi-path interference, which always greatly affects the low-altitude targets radar pitch angle measurement. With the target flying, multi-path echo signal effects are periodic of enhancement and attenuation.
当地、海基雷达对低空飞行目标进行跟踪测量时，多径回波信号的干扰，极大地影响了雷达对低空目标俯仰角的测量，随着目标的飞行，多径效应使回波信号呈周期性的增强和衰减。 - Based on ultrasonic echo method, the relation between ultrasonic attenuation coefficient and the amplitude of surface as well as bottom echo wave was studied, and portable ultrasonic inspecting system for void content of CFRP was constructed.
以超声反射法为基础，研究了超声衰减系数与材料表面和底面回波幅值之间的数学关系，构建了碳纤维复合材料孔隙率检测便携式超声系统。