A novel electroless silver depositing method for magnesium alloys

Depositing silver on magnesium alloy by both electroless plating and organic coatings was studied. The organic coating was made by immersing samples in organosilicon heat-resisting varnish. In this method the organic coating acts as interlayer between the substrate and silver film. When the reaction starts, silver deposits directly on the interlayer. X-ray diffraction and SEM analysis were used to determine the composition and morphology of the interlayer and silver film. The potentiodynamic polarization curves for corrosion studies of coated magnesium alloys were performed in a corrosive environment of 3.5% NaCl（mass fraction） at neutral pH （6.9）. The results indicate that compared with the substrate, the corrosion resistance of coated magnesium alloys increases greatly. Moreover, the method proposed in this work is environmentally friendly, non-toxic chemicals were used. In addition, it provides a new concept for the corrosion inhibition of magnesium alloys.     

射线检测中运动模糊图像的恢复

X射线实时成像检测中,若曝光时间内工件和X射线图像采集设备有相对线性运动,会造成图像运动模糊降质。提出利用运动模糊点扩展函数的频域特征和Hough变换得到模糊图像的运动方向,并将之旋转到水平轴方向,利用差分法求解运动模糊点扩展函数的长度。并用Wiener滤波的方法,恢复降质的图像,取得了较好的效果。     

国产60吨铝熔炉感应式电磁搅拌器的应用

介绍了60t炉底感应式电磁搅拌器的应用方案、工作原理、设备组成和安装形式,阐述了电磁搅拌器对熔融金属化学成分均匀性、温度均匀性以及金相组织的影响,分析了电磁搅拌的整体运行效果,并总结了电磁搅拌器的应用特点。     

简单断面孔型计算机绘图系统简介

介绍了简单断面孔型计算机绘图系统的编制方法、使用范围 ,计算机绘图的步骤及特点     

Abnormal Austenite-Ferrite Transformation Behaviors of Fe-ISi: Dilatometric Measurements

WITH THE APPEASING of competition of the totaloutput of iron and steels, the new generation of ultrahigh strength steel, based on the lessen the burden ofenvironment, double improvement of mechanicalproperties and elongation of the serving life, has beenfully outspreaded in the world. More and more researchwork shows that the solid-state microstructureevolution becomes the most effective route in thedevelopment of ultra-high strength steels. A process ofgreat interest in the steel produc…     

基于MATLAB的热定型机PID张力控制器设计

文章介绍了热定型机的工作原理,及其定型过程中张力系统控制结构图,并以此为基础建立了张力控制系统的数学模型.基于比例积分微分(PID)控制器的原理,利用MATLAB软件设计了张力控制器,其编写的PID参数整定函数能作为MATLAB函数进行直接调用.实验和仿真结果表明:该控制器完全满足张力控制系统的性能要求,降低了超调量,提高了系统的动静态性能;同时设计简单、易于实现.     

数控机床位置伺服在线调试与动态性能分析研究

介绍一种在数控机床位置伺服系统在线调试中应用系统动态性能分析方法的基本原理，给出了一种位置伺服系统动态响应曲线、动态性能分析及其主要技术指标的实例。     

面向21世纪的信息化制造

本文叙述了信息化制造的哲理 ,分析了其特点 ,提出了其体系结构及企业新产品开发模式和企业电子商务 ,并分析了信息化制造的关键技术。