弧焊电源检测设备的设计与实现

弧焊电源的性能是影响焊接质量及其使用安全的重要因素,因此需要专用设备对出厂的弧焊电源进行检测。该弧焊电源测试设备是主从式结构,由硬件系统和软件系统两大部分组成。硬件系统由嵌入式微控制器控制,主要完成设备数据采集和信息显示,软件系统在嵌入式Linux环境下进行开发,完成图形用户界面程序及采集程序的编写。该设备可以实现对弧焊电源的自动测试,如负载加载、数据传输等,体现了良好的人机交互性。本系统将应用于电焊机的出厂检验,通过对弧焊电源的电参数的测试来评估被测产品的质量和性能。     

Phase diagrams for the` Lu−Cr−B and Lu−Mo−B systems

X-ray diffraction data have been used in compiling equilibrium phase diagrams for the Lu?Cr?B and Lu?Mo?B systems at 1270 K. The boride LuB₂ dissolves not more than 0.03 molar part of CrB₂ and 0.30 molar part of MoB₂. The existence of compound LuCrB₄ is confirmed (structure of YCrB₄ type) and the same for Lu₂MoB₆ (structure of Y₂ReB₆ type). A homogeneity regions is identified for the boride Lu₂MoB₆, which ranges up to the composition LuMoB₄.     

HBMPPT与TOPO协同萃取三价镧系元素的机理研究

用新合成的４－苯甲酰基－２,４－氢－５－甲基－２－基基－３Ｈ－吡唑硫酮－３（ＨＢＭＰＰＴ）作为萃取剂、三正辛基氧化膦（ＴＯＰＯ）作为协萃剂,研究其在硝酸介绍中对三阶镧系元素的萃取行为及温度、萃取剂浓度及本酸度等各种影响因素对萃取分配比的影响,并对萃取配合物的化学组成及萃取机理进行了分析和探讨。     

三维CAD技术在水利水电工程设计中的应用

本文结合水利水电工程设计任务,介绍了建立在三维数字模型下的三维CAD技术的应用领域及其设计特点。     

Transmutation of Technetium into stable Ruthenium in high flux conceptual research reactor

The effectiveness of transmutation for the long-lived fission product Technetium-99 in a high flux research reactor is evaluated, taking into account its large capture cross section in the thermal and epithermal regions. Calculation of the evolution of the Ruthenium concentration under irradiation was performed using the ChainSolver 2.20 code. The results on Technetium transmutation suggest an effective use of this kind of research reactors and describes a new concept of multi-recycle Technetium transmutation using HFR_TRAN (high flux research reactor for transmutation).     

Mechanical properties and fracture behavior of high-strength steels

Typical thicknesses of high-strength steels (HSS) sheets used in the car industry are inapplicable for standardized testing procedures. The aim of this study is to propose an appropriate methodology for testing and comparing of thin HSS sheets. Microstructures were observed by means of light and scanning electron microscopy. The modified Charpy impact tests and fracture toughness tests were used in order to compare the fracture properties of three different HSS sheets (Docol 1200 M, Multiphase 1200 and BTR 165). Ductile-to-brittle transition curves and tearing resistance (J − Δa) curves were measured. From the fracture toughness linked to the specimen thicknesses the value of fracture toughness K_Ic was estimated. Fractographic analysis of broken specimens has revealed that due to the fine microstructure of mixed ferrite-martensite fracture mechanism remains ductile even at low temperatures (down to −100°C). __________ Translated from Problemy Prochnosti, No. 1, pp. 155–158, January–February, 2008.     

Influence of Cu<Superscript>2+</Superscript> ions on structural and magnetic properties of NiZn ferrites

The paper is devoted to the preparation of NiZn ferrite with small substitutions of copper by means of ceramic technology. The influence of small Cu substitution on the microstructural and magnetic properties of NiZn ferrites have been analysed by means of various experimental methods and interpreted from the point of view of preparation technology optimisation and possible applications of such materials. A strong correlation between the substituent content and resulting properties has been observed, thus allowing preparation of material with the properties tailored for any particular application.