2) ultrasonic physical analogue
超声波物理模拟
3) Ultrasonic echo model
超声回波模型
1.
The ultrasonic echo model is applied to simulate the ultrasonic echo of detection object and the Gauss-Newton iterative method is applied in the simulation process to estimate the parameters.
应用超声回波模型,对检测目标的超声回波进行模拟,在模拟过程中应用高斯与牛顿法迭代出估计参数。
4) ultrasonic echo
超声回波
1.
Image signal carried by ultrasonic echo is valuable information in diagnose.
超声回波中所加载的图像信号是诊断中所需要的有价值的信息,鉴于超声波本身在人体中传播和衰减的特性,超声回波的接收和放大电路直接影响超声图像的质量,在超声仪器中占有重要地位,本文就其中的部分功能电路作了说明与分析。
2.
Based on the principle of sand particle falling, a new method using the ultrasonic echo technique has been introduced for analysing particle sias.
基于泥沙的沉降特性，本文利用超声回波技术，提出了一种新的泥沙颗分方法，经对沙样的实际比测表明，超声颗分具有重复性好，无接触测量，连续自动采样且不受泥沙色度的影响等特点，为泥沙的颗粒分析提供了新的途径。
3.
Firstly, the basic principles of EMD decomposition method and neural network were introduced in this paper, ultrasonic echo signal was analyzed in time domain and frequency domain by EMD, and then the parameters of time and frequency domain characteristics were analyzed and summarized.
本文首先介绍了EMD分解方法和神经网络的基本原理,利用EMD对超声回波信号进行了时域和频域的分析,归纳分析了回波信号在时域和频域的特征参数,在此基础上分析了神经网络输入特征参数的选择原则以及如何选取部分时、频域特征参数作为神经网络输入,并得出了较理想的特征参数组合。
5) ultrasonic simulation
超声模拟
1.
In this paper,ultrasonic simulation method has been applied to study seismic waves affected by Karst zone in limestone of North China coalfield.
应用地震波超声模拟方法，研究了华北型煤田的煤系底部奥灰岩岩溶发育带对地震波的响应特征，为地震勘探技术应用于矿井台水提供了依据。
6) echo simulation
回波模拟
1.
In order to evaluate the results of this system in practical application, a mathematical method based on Monte Carlo analysis was put forward, which includes two parts, as echo simulation and detection probability calculation.
给出了雷达检测概率测试系统,并提出了一种基于MonteCarlo法的数学算法以评估该系统在实际应用时所得的测试结果,它主要包括回波模拟和检测概率计算两个部分。
2.
According to the requirement of high frequency ground wave radar s test and the extraction reference of target information in HF ground wave radar, a responder is designed to complete the tasks of radar scaling, multichannel receiver calibration, echo simulation, and target management combining with the secondary radar s work principle.
针对高频地波雷达测试的要求以及目标信息的提取依据,设计应答器来完成雷达定标、多同道接收机校准和回波模拟的任务,同时结合二次雷达的工作原理来实现目标管理的目的。
3.
In order to evaluate the results of this system in practical application, a mathematical method based on Monte Carlo analysis was put forward, which includes two parts, as echo simulation and detection probability calculation.
给出了雷达检测概率测试系统,并提出了一种基于MonteCarlo法的数学算法以评估该系统在实际应用时所得的测试结果,它主要包括回波模拟和检测概率计算两个部分。
补充资料：单次激发回波平面成像
单次激发回波平面成像
磁共振成像术语。磁共振快速成像的方法之一。仅使用一次射频(RF)脉冲激励来获得图像的回波平面成像(EPI)方式。在EPI数据采集过程中令读出梯度快速往返振荡，产生一个相位编码彼此独立的梯度回波链，最终形成一幅图像。单次激发EPI采集时间短，一般仅为50～100ms，但存在着信号强度低、空间分辨率低、视野受限、磁敏感性伪影明显等缺点，这些缺点随技术的进步正在不断地克服。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条