小功率空气冷却ICP-AES 研究I——小功率空气冷却ICP的特性

本文用顺序等离子体光谱仪研究了27.12MHz他激式R.F.发生器点燃的小功率空气冷却ICP的特性。测量并比较了二十个元素五十七条谱线在空气冷却和氩冷却两种ICP中的检测限。     

一种微波加热装置的风冷散热研究

微波加热装置工作过程会散发大量的热量,如果不能及时排出,会造成输出功率的下降.本文以九个磁控管加热单元组成的微波加热装置为研究对象,首先提出一种风冷散热结构设计,接着通过Fluent热仿真软件验证结构设计的合理性,然后通过对比分析加热装置进风口位置、面积大小等因素对散热效果的影响,对散热结构进行改进,进一步提高了内部磁...     

Effect of pearlitic morphology with varying fineness on the cavitation erosion behavior of eutectoid rail steel

The present work discusses the effect of the pearlitic morphology with varying fineness on the cavitation erosion behavior of eutectoid rail steel. Cavitation erosion of three different types of the pearlitic steels (furnace-cooled, air-cooled, and forced-air-cooled) consisting of coarse, fine, and very fine microstructures were tested in 3.5% NaCl solution and compared with that of the as-received pearlitic rail steel. The variation in the mean depth of erosion (MDE) and mean depth erosion rate (MDER) with erosion time was analyzed. Furthermore, the cavitation erosion resistance of the as-received, the air-cooled, and the forced-air-cooled was found to be 1.03, 1.51, and 2.14 times better than the furnace-cooled pearlitic steel, respectively. It was concluded that the cavitation erosion resistance of the pearlitic steel increased with the increase in the fineness of the microstructure.     

基于GPIB通信的大冷量风冷冷水机组性能测试系统设计

大冷量风冷冷水机组性能测试系统是针对研制的500RT风冷冷水机组性能测试台运行过程中所需要的参数采集、监测以及处理的专门软件。软件开发依据GB/T 18430.1-2007和AHRI 551/591所规定的风冷冷水机组性能测试要求进行,应用最常用的Visual Basic面向对象编程语言为开发平台,构建高效的采集、检测与数据处理测试程序,能够实现对风冷冷水机组性能测试过程中实验数据自动保存与分析处理。测试软件系统通过数据采集仪以通用GPIB接口通信方式把各种传感器获取的信号传输至计算机,实现在不同测试工况下对风冷冷水机组各项性能测试参数的自动采集与监控。测试软件系统能够根据测试所得数据进行测试系统状态判定,有效实验数据分析处理、存档,绘制和打印实时曲线,并输出测试报告。     

小功率空气冷却电感耦合等离子体发射光谱的研究 Ⅱ.碱金属和碱土金属分析特性

本文测定了碱金属、碱土金属九个元素48条谱线在空气冷却ICP中的信背比和检出限,并同全氩ICP的检出限进行了比较。本工作还测绘了各元素灵敏线与9个常见共存元素的光谱重叠扫描图,以了解可能存在的光谱干扰。