Ⅲ型预埋铁座铣削专用设备电气控制

本文介绍了一专用设备的电气控制原理     

中频变频器UFV故障探析

本文对中频变频器的UFV故障进行了系统试验和原因分析，并对UFV故障的关键因素进行了详细探析。     

Characterization of imidazole-cured epoxy–phenol resins

The physical and chemical properties of the diglycidyl ether of bisphenol A (DGEBA) cured with different concentrations of bisphenol A (BPA) and 2-ethyl-4-methylimidazole (EMI-24) were examined using Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical and dielectric analyses, and solvent extraction studies. The effects of the phenol-epoxide and the secondary hydroxyl (R-OH)-epoxide reactions on the network formation process were analyzed using a recursive modeling technique to obtain expressions for the weight-averaged molecular weight, the weight fraction solubles, and the gel point as a function of the extent of cure and the epoxide-phenol reactant ratio. The sol fraction and the gel point predictions from recursive modeling studies of the network formation process agreed with the results obtained from the extraction studies. The results from the network modeling studies were also related to the thermal and rheological properties of the resin during cure.     

Spatially Resolved Stress Measurements in Materials With Polarisation-Sensitive Optical Coherence Tomography: Image Acquisition and Processing Aspects

Abstract:  We demonstrate that polarisation-sensitive optical coherence tomography (PS-OCT) is suitable for mapping the stress distribution within materials in a contact-free and non-destructive way. In contrast to transmission photoelasticity measurements, the samples do not have to be transparent but can be of scattering nature. Denoising and analysis of fringe patterns in single PS-OCT retardation images are demonstrated to be the bases for a quantitative whole-field evaluation of the internal stress state of samples under investigation.     

国内外通用型金属封闭开关设备技术动态（二）

本文介绍了通型金属封闭开关设备的上总体水平,目前产品的结构与特点,国内产品的自行才引进以及今后产品的发展前景。     

DK5-1600智能型低压真空断路器

DK5－1600智能型低压真空断路器是联合开发的新产品。本文介绍该产品的适用范围、结构、原理、特点、基本参数和技术性能及主要应用。     

套期保值原理及其应用

本文介绍了期货套期保值的概念、基本原理、作用、实现条件、操作原则、类型及特征 ,列举了金银期货套期保值实际应用方法及注意事项。     

CAN总线在电动汽车BMS系统与充电桩之间通信的应用

电动汽车是我国新能源战略重点之一,国家电网公司为此积极展开电动汽车充电站的建设。国家电网将按照换电为主、插充为辅,集中充电、统一配送为基本商业模式,加快电动汽车充换电站的布局和建设。不论是插充方式还是集中充电,电动汽车的普及都离不开充电智能化,而BMS与充电桩或其他充电设备的无缝连接正是实现充电智能化的必要条件。文章提出了BMS管理系统与充电桩之间的通信设计方案,利用CANBUS实现BMS管理系统与充电桩的通讯,介绍了CAN通讯的硬件设计和软件设计,并经过与充电桩的反复测试,实现了BMS管理系统与充电桩的通信。     

化学结构的计算机处理（V

根据歧义结构的不同特点，结合计算机结构处理的实际要求，可将歧义结构分为互变异构、环交替键化合物、带离域电荷离子、配价键化合物、金属盐、有机氮盐及类似物、多肽、碳水化合物等不同类型，分别采用转换录入、选择录入、多重录入等方式解决结构歧义性问题。本文介绍实际处理中的一些基本算法，并举例说明。