查询词典 speckle

This paper studies crack initiation and propagation in LT specimens of Betula platyphylla Suk. by the digital speckle correlation method.

该文以白桦为研究对象，利用数字散斑相关技术对白桦LT型裂纹的演化与增长的力学行为进行了实验研究。

Fleck: Transmissibility aestates , chloasma , sunburn , lead mercury speckle , senile plaque , chromatosis etc.

色斑：遗传性雀斑、黄褐斑、晒斑、铅汞斑、老年斑、色素沉着等。

A detector array target of laser distant-field detect system is designed, and two key factors are analyzed. To determine the size of the array target, the laser diffract effect and the influence of atmospheric turbulence are discussed, three factors that influence the resolution of the array target are analyzed. Three factors are the dimension of laser speckle resulted by atmospheric turbulence, space sampling frequency based on sampling theory and the loss of the frequency spectrum function of the array detector.

设计了一种激光远场直接探测系统，对系统中的两个关键问题进行了讨论，一、在探测器阵列靶板尺寸的确定问题上讨论了激光的衍射效应和大气湍流的影响；二、在探测器阵列靶板分辨率的确定问题上讨论了激光的衍射效应和大气湍流的影响；对第二问题讨论了对其有影响的三个方面：大气湍流引起激光碎斑尺寸，由采样定理决定的空间采样率，由阵列探测器的频谱函数引起的损失。

An algorithm based on dyadic wavelet transform for speckle reduction and contrast enhancement in intravascular ultrasound images was presented.

提出基于二进小波变换的血管内超声图像血液斑点噪声抑制和对比度增强算法。

Blood speckle noise in the IVUS image would affect the validity of edge detection badly. A temporal/spatial filtering method was used to preprocess the IVUS image to restrain the noise. Then a method to automatically detect the intima and ectoblastic edge of IVUS image was presented. This method is based on the active contour model and the contrast properties of IVUS image, which makes use of the Hopfield NN and simulated annealing algorithm.

为解决血管内超声图像中严重的血液斑点噪声影响边缘提取方法的有效性问题，采用一种时/空滤波方法对IVUS图像进行降噪预处理，基于活动轮廓模型和IVUS图像的边缘对比度特征量，利用Hopfield神经网络并结合模拟退火算法自动提取IVUS图像的冠脉血管壁内、外膜边缘。

Epauletted fruit bats speckle a saffron-colored sky at sunset in Zambia's Luangwa Valley.

在赞比亚的卢安瓜山谷里，肩毛果蝠在夕阳染成绛红色的天空下飞舞。

Epauletted fruit bats speckle a saffron-colored sky at sunset in Zambia's Luangwa Valley.

在赞比亚的卢安瓜峡谷里，肩毛果蝠点缀着日落时藏红色的天空。

Epauletted fruit bats speckle a saffron-colored sky at sunset in Zambia's Luangwa Valley.

位于赞比亚的Luangwa山谷日落时刻，由于果蝙蝠群飞翔变得藏红花色斑点的天空。

Photo of the Day December 10, 2007 Fruit Bats at Dusk, Zambia, 2007 Photograph by Frans Lanting Epauletted fruit bats speckle a saffron-colored sky at sunset in Zambia's Luangwa Valley.

位于赞比亚的Luangwa山谷日落时刻，由于果蝙蝠群飞翔变得藏红花色斑点的天空。

Digital speckle correlation ; program objectoriented ; fingerlike diagonal joint of wood ; mechanical property ; nondestructive examination

数字散斑图像相关；面向对象编程技术；指接木材；力学性能；无损检测

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。