基于故障树的弯管机液压系统故障分析

弯管机系统由机械系统、液压系统、电气控制系统及冷却系统组成，以弯管机液压系统为研究对象，分析了液压系统可能出现的故障以及其形成原因，通过建立液压系统故障树和计算结构重要度系数定性地对弯管机液压系统进行故障分析，实现易发故障预警和故障快速定位功能，提高了弯管机可靠性。此分析法可扩展至其他领域。     

清脆爽口荸荠肴

荸荠，古称乌芋、凫茨等。据《本草纲目》载：“乌芋其根如芋而色乌也。”因凫喜食之，故《尔雅》名凫茈，后遂讹为凫茨。不过今人对荸荠的称呼更为有趣，将荸荠称为马蹄，也称地栗。称它为马蹄，仅指外表。称它为地栗，不仅指其形状像栗子，还因为它生长在泥巴之中。     

A measurement system for YTO

Yttrium iron garnet（YIG） tuned oscillator （YTO）,which is widely used in signal source,is difficult to be measured manually for its numerous parameters.In order to accomplish the measurement of YTO quickly and automatically,this paper gives the design of an auto-measurement system based on genernal purpose interface bus （GPIB）.     

离子液体修饰超顺磁性纳米颗粒用于青霉素G酰化酶固定化(英文)

Functionalized ionic liquids containing ethyoxyl groups were synthesized and immobilized on magnetic silica nanoparticles(MSNP) prepared by two steps,i.e.,Fe3O4 synthesis and silica shell growth on the surface.This magnetic nanoparticle supported ionic liquid(MNP-IL) were applied in the immobilization of penicillin G acylase(PGA).The MSNPs and MNP-ILs were characterized by the means of Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and vibrating sample magnetometer(VSM).The results showed that the average size of magnetic Fe3O4 nanoparticles and MSNPs were ~10 and ~90 nm,respectively.The saturation magnetizations of magnetic Fe3O4 nanoparticles and MNP-ILs were 63.7 and 26.9 A?m2?kg?1,respectively.The MNP-IL was successfully applied in the immobilization of PGA.The maximum amount of loaded enzyme was about 209 mg?g?1(based on carrier),and the highest enzyme activity of immobilized PGA(based on ImPGA) was 261 U?g?1.Both the amount of loaded enzyme and the activity of ImPGA are at the same level of or higher than that in previous reports.After 10 consecutive operations,ImPGA still main-tained 62% of its initial activity,indicating the good recovery property of ImPGA activity.The ionic liquid modified magnetic particles integrate the magnetic properties of Fe3O4 and the structure-tunable properties of ionic liquids,and have extensive potential uses in protein immobilization and magnetic bioseparation.This work may open up a novel strategy to immobilize proteins by ionic liquids.     

变压器用金属波纹储油柜的应用

回顾了电力变压器储油柜的发展历程,介绍了一种新型金属波纹储油柜的现场应用技术及其在发电厂、变电站的应用前景。