基于无线通信方式的TV二次压降现场测试方法

针对传统的TV二次压降现场测试方法存在的问题,提出基于无线通信技术的检测方法。以提高工作效率,降低安全风险。     

一种新的基于Zernike正交矩亚像素边缘定位的直径测量方法

提出了一种新的基于亚像素边缘定位技术的棒状物体直径测量方法;该方法利用两个CCD摄像头,分别获得两张棒状物体横截面的椭圆特征图像,利用仿射变换将灰度椭圆特征图像变换成圆形特征图像,然后利用亚像素中的Zernike正交矩对边缘进行精确定位,进而分别计算出棒状物体的直径,再将两个测量数据加以平均融合,完成对直径的测量;实验结果表明,与像素级方法相比较,该方法定位精度高,测量误差小,能够达到提高测量精度的目的。     

Development and spatial organization of the air conduits in the lung of the domestic fowl, Gallus gallus variant domesticus

We employed macroscopic and ultrastructural techniques as well as intratracheal casting methods to investigate the pattern of development, categories, and arrangement of the air conduits in the chicken lung. The secondary bronchi included four medioventral (MVSB), 7-10 laterodorsal (LDSB), 1-3 lateroventral (LVSB), several sacobronchi, and 20-60 posterior secondary bronchi (POSB). The latter category has not been described before and is best discerned from the internal aspect of the mesobronchus. The secondary bronchi emerged directly from the mesobronchus, except for the sacobronchi, which sprouted from the air sacs. Parabronchi from the first MVSB coursed craniodorsally and inosculated their cognates from the first two LDSB. The parabronchi from the rest of the LDSB curved dorsomedially to join those from the rest of the MVSB at the dorsal border. Sprouting, migration, and anastomoses of the paleopulmonic parabronchi resulted in two groups of these air conduits; a cranial group oriented rostrocaudally and a dorsal group oriented dorsoventrally. The neopulmonic parabronchial network formed through profuse branching and anastomoses and occupied the ventrocaudal quarter of the lung. There were no differences in the number of secondary bronchi between the left and right lungs. Notably, a combination of several visualization techniques is requisite to adequately identify and enumerate all the categories of secondary bronchi present. The 3D arrangement of the air conduits ensures a sophisticated system, suitable for efficient gas exchange. Microsc. Res. Tech., 2008. (c) 2008 Wiley-Liss, Inc.     

碱性蓄电池隔膜用非织造布探析

介绍了碱性蓄电池隔膜用非织造布在电池生产中的作用和要求,对碱性蓄电池隔膜用非织造布的纤维原料、生产方法进行了比较分析。     

基于Zernike矩和DCT变换的数字水印算法

提出一种基于Zernike矩和DCT变换的鲁棒数字水印算法,对图像的旋转角度进行估计,以提高其抵抗旋转攻击的能力,将基于图像内容的具有正交特性的Zemike多项式作为水印信号,并在Watson视觉感知模型的控制下嵌入图像低频系数中,同时采用相关检测方法确定水印的存在,实验结果表明,该算法具有良好的鲁棒性、不可见性及可检测性。     

二次发射体MgO薄膜的俄歇电子能谱的研究

本文叙述了用PHI—550型给定的俄歇电子能谱(AES)研究了一种新的、性能优异的二次电子发射材料——MgO薄膜。薄膜由Ag—Mg合金经特殊高温激活工艺处理而成。以前人们对这种薄膜内部的各种元素的化学状态以及纵向原子浓度的分布状态一直不太清楚,本实验的成功证明了俄歇(Auger)电子能谱是研究这种薄膜的一种非常合适的实验方法。从实验结果中,我们发现如下几点 1.激活后,Mg和O原子的化学状态发生了显著的变化。 2.激活后,Mg、O和Ag原子的纵深分布也发生了显著的变化。 3.Mg原子氧化不充分,为了改进这一缺点,我们发明了一种新工艺。 4.使用新工艺激活,Mg原子可获充分氧化。     

A RIS treatment of the mean-square dipole moment of PMMA chains in consideration of the pendant ester group orientations

According to the six-state scheme proposed by Vacatello and Flory, the mean-square dipole moments 〈M²〉/x (x: number of monomeric units) of poly(methyl methacrylate) (PMMA) chains and their temperature dependence were calculated by the matrix algebra method of rotational isomeric state theory. To take account of the orientation effect of polar ester groups, the statistical weight matrices, U′ and U″, were recast into an expanded form. A Bernoullian probability λ introduced to measure the preference between the two alternative orientations (χ=0 and χ=π) of the side ester groups was found to give rise to a large effect on the mean-square dipole moment of polymers. When the skeletal bonds of a meso dyad are both in trans, an exceptionally strong dipole-dipole interaction may take place. If the two adjacent ester groups adopt the same orientation, the dipoles must be situated nearly parallel to each other in a close proximity. Such repulsive interactions may be alleviated by taking a staggered conformation, i.e. (χ,χ′)=(0,π) or (π,0). Such neighbor-dependent correlation inherent to the meso dyad is considered by assigning a parameter λ′ to the proper element of the U_m″ matrix. The values of 〈M²〉/x observed at 30 °C were satisfactorily reproduced by adopting λ=0.270 and λ′=0.865. The thermal coefficients were found to be reconciled with the available experimental data by allowing the orientation parameters λ and λ′ to be slightly temperature dependent. The stereochemical characteristics of the chain terminals were examined in order to extend the treatment to include the dipole moment of PMMA oligomers.     

Effect of Hot Band Annealing on Magnetic Properties in 3% Si Grain‐oriented Electrical Steels

Hot band annealing is known to be a prerequisite for good magnetic properties irrespective of manufacturing methods in grain‐oriented Fe‐3 wt.% Si electrical steels. In this study, the effects of hot band annealing on magnetic properties were investigated in 3% grain‐oriented electrical steels of low soluble AI contents and one‐stage cold rolling. Microstructure and precipitate distribution were compared with hot band annealing conditions. Secondary recrystallization behaviour with hot band annealing condition was also discussed.     

Improved estimation of defocus blur and spatial shifts in spatial domain: a homotopy-based approach

This paper presents a homotopy-based algorithm for the recovery of depth cues in the spatial domain. The algorithm specifically deals with defocus blur and spatial shifts, that is 2D motion, stereo disparities and/or zooming disparities. These cues are estimated from two images of the same scene acquired by a camera evolving in time and/or space. We show that they can be simultaneously computed by resolving a system of equations using a homotopy method. The proposed algorithm is tested using synthetic and real images. The results confirm that the use of a homotopy method leads to a dense and accurate estimation of depth cues. This approach has been integrated into an application for relief estimation from remotely sensed images.     

电力电缆接头温度远程在线监测网络系统

论述了系统的拓扑结构、功能和应用场合。阐述了主机和从机之间的通信机理并自定制了双方的通信协议。提出了主机获取数据及其对数据的处理方法。设计了数据库的管理、查询、统计、报表生成和打印等子系统。论述了从机的硬件组成以及各模块功能 ,从机主程序和通信中断服务程序的功能及实现思想