Eliminating the Influence of the Perturbed Reference Wave in Electron Holography

Abstract

A method is developed to eliminate the influence of the perturbed reference wave when long-range electromagnetic fields are investigated by electron holography. Based on phase relationships between the reference wave and the object wave, with digital reconstruction and data processing, we can extract the phase of an object wave from the phase difference between the object wave and the perturbed wave, which is always obtained in normal reconstruction. An example of one-dimension electromagnetic fields is given to verify this method.     

Effects of elevated water temperatures on interfacial delaminations,failure modes and shear strength in externally-bonded CFRP-concrete beams using infrared thermography,gray-scale images and direct shear test

This paper reports the results of a durability study of the effects of exposing externally-bonded CFRP-concrete beams to three elevated water temperatures (25 °C, 40 °C and 60 °C). The effects of the heated water environments on the adhesive bonding layer between the CFRP and concrete beams were evaluated by quantifying: (1) the changes of delaminations within the adhesive bonding layer, (2) the changes in resistance to direct shear force and (3) the changes of failure mode distribution. Before the exposure, the condition of the adhesive bonding layer was inspected by infrared thermography (IRT). After exposure, the deterioration of the same bonding layer and failure mode distributions were measured by analyzing the visual photos on the failed CFRP strips. The failure modes were found to be affected largely by the combined effect of elevated temperature and moisture ingress, in which three types were identified: failure at concrete beams, at adhesive bonding layer and interface between CFRP strip and concrete. With these methods, results of 54 specimens show that the adhesive bonding layers of all the specimens had gradually deteriorated in the 40 °C and 60 °C water baths. This deterioration was due to the weakening of the adhesive bonding layers when the glass transition temperature (T_g) or the heat distortion temperature (HDT) was approached or even exceeded, and gradual development of delaminations at adhesive bonding layer.     

基于S3C44BOX+μcLinux的嵌入式以太网设计与分析

本文介绍了基于一款ARM处理器--S3C44B0X的以太网接口电路设计,并详细地阐述了在嵌入式操作系统μcLinux下网卡驱动的实现.     

基于S3C44B0X μcLinux的嵌入式以太网设计与分析

本文介绍了基于一款ARM处理器——S3C44B0X的以太网接口电路设计,并详细地阐述了在嵌入式操作系统μcLinux下网卡驱动的实现。     

Modeling complex heterogeneous objects with non-manifold heterogeneous cells

This paper presents a new approach to model complex heterogeneous objects with simultaneous geometry intricacies as well as complex material distributions. Different from most of the existing approaches, which utilize manifold B-Rep and the assembly representations, the proposed scheme takes advantage of the non-manifoldcellular representations to model the geometries of the heterogeneous objects. With the aid of the cell adjacency information and attribute based reasoning, complex, smooth and versatile material distributions can be defined upon the intricate geometries. Compared with other similar approaches, the proposed scheme (1) generates heterogeneous object models with higher data consistencies and lower redundancies; (2) naturally avoids unnecessary/repetitive computations and thus improves computation efficiencies; (3) represents versatile material variations/distributions using different heterogeneous feature tree (HFT) structures. The detailed representation, associated algorithms and a prototype software package are presented. Example heterogeneous objects modeled with the proposed approach are provided.     

对交流电源装置做试验时的节能方法

本文介绍了一种对交流电源装置作试验的方法，该方法所采用的电路主要由两变流器组成，采用该方法做试验所消耗的电能经常规的方法要少得多而且对负载的适应能力也比较强，本文中，我们采用了一个简单的控制方法及系统设计，通过对一交流调速电机驱动器的原理实验，验证了该方法的有效性。     

生物驻极体材料对细胞生长的影响

研究天然生物高分子（如胶原）对组织损伤修复的影响．从猪皮中提取的Ｉ型胶原通过ＴＳＤＣ技术极化，并测试其驻极化前后的ＴＳＤＣ变化．将极化的材料用于细胞培养．得到了细胞生长曲线．实验证实，极化后的材料能加速细胞的生长．有可能用作生物医用材料．     

减阻聚合物薄膜的研制

表面修形技术,可以减少飞机阻力而不改变飞机结构,应用方便,维护简单,颇有吸引力。国外70年代开始进行该技术的研究,大多数研究者利用Riblets(它是一些具有顺流向开槽的平面,而沟槽面的形状通常为三角形,沟槽深为几个微米)来减小紊流附面层阻力[1].美国3M公司制造的自粘接Riblets     

关于励磁机的振动问题

励磁机振动是汽轮发电机组运行中较为普遍的一个问题。分析了导致励磁机振动的几个主要因素:结构共振、发电机振功传递、转子不平衡。还对其他若干因素的影响做了一些分析。     

电站通风机和电动机的现场平衡

介绍了电站通风机和电动机的现场平衡方法,并结合实例做了说明.