泥沙与鄱阳湖水环境

分析并讨论了鄱阳湖泥沙的来源及其对鄱阳湖水环境质量的影响。     

Aqueous Tape Casting Process with Styrene-acrylic Latex Binder

A commercial styrene-acrylic latex binder has been investigated as a good binder for aqueous Al₂O₃ suspensions tape-casting process. This paper focuses on the forming film mechanism of latex binder, the rheological behaviors of the suspensions, physical properties of green tapes and drying process of aqueous slurries with latex binder system. The drying process of the alumina suspensions is shown to follow a two-stage mechanism (the first stage: evoporation controlled process; and the second stage: diffusion controlled process). During the drying stage of the suspensions, the compressive force presses the latex particles and makes them be distorted, which results in cross-linking structure in contacted latex particles of the solidified tapes. A smooth-surface and high-strength green tape was fabricated by aqueous tape casting with latex binder system. The results from the SEM images of the crossing section microstructure of green tapes show that the latex is a very suitable binder for aqueous tape casting. CUI Xue-min: Born in 1971 Funded by “973” Program (No. G2000067204-01)     

Molten Salt Synthesis of Ba（ Mgl／3Nb2／3 ）O3 Powder

The single-phrase Ba(Mgl/3Nb2/3)O3(BMN) powder was saccessfully prepared by the KCImolten salt synthesis(MSS) method. The temperature for single-phase BMN powders by MSS was about 400℃ lower than that by the solid-phase method. The average particle size (APS) was about 0.91,u.m at 900℃ and increased with increasing synhesis temperature. Based on the APS, the activation energy for particle growth in theMSS, whose value was 64. 1kJmol^-1.was attained. The sinterability of the powder prepared by MSS method wasbetter than that pretared by solid-phase method.     

水树对XLPE电缆绝缘材料性能和微观结构影响的研究进展

阐述了交联聚乙烯(XLPE)电缆中水树引发、生长理论,讨论了水树枝模型及水树化学反应过程,分析了水树对XLPE电缆绝缘材料电性能(介电常数、击穿电压、损耗因子、电导及电树引发电压)的影响。在此基础上,介绍了水树对XLPE电缆绝缘材料微观结构的影响,包括水树中的氧化降解作用对电缆微观结构以及水树对电缆绝缘中空间电荷分布的影响。     

环形磁通门的非线性误差及补偿技术

磁通门技术被广泛应用于低频微弱磁场领域,尤其是地磁场的测量.地磁的精确测量要求磁力仪具有极小的误差,目前国内外关于磁通门误差的补偿研究主要针对于比例因子误差、零偏和非正交误差,对非线性误差的研究比较少.利用软磁材料的磁化曲线函数可由多项式拟合的特性,建立了环形磁通门传感器的非线性误差模型,并提出了非线性误差补偿方法.通过实验对一维环形磁通门传感器的非线性误差进行矢量补偿,取得了显著效果.     

RH真空室烘烤装置的改进

原 RH真空室烘烤装置升降小车采用齿轮齿条传动方式或链轮链条传动方式 ,都曾多次发生事故 ,改用液压推杆——链条传动方式后使用效果很好。     

高温空气燃烧技术研究与应用现状及发展方向

简述了蓄热式高温空气燃烧技术的形成背景、技术原理、技术特点、发展过程以及国内外的研究与应用现状，介绍了蓄热式高温空气燃烧技术的应用条件与适应范围，分析了现有技术的不足与发展方向。     

12MnNiVR钢板拉伸试样分层开裂原因分析

利用金相显微镜、扫描电镜、能谱分析等手段,研究12Mn Ni VR钢轧后拉伸试样中的夹杂物和显微组织,分析拉伸试样产生分层现象的原因。结果表明,在连铸坯凝固过程中12Mn Ni VR钢钢坯中心出现以合金元素C、Mn为主的偏析,使轧后钢板中存在大量的长条状Mn S夹杂物和条带状回火索式体组织。组织的不均匀致使试样在拉伸过程中产生局部应力集中,进而出现开裂分层现象,导致力学性能下降。     

IC封装的扩晶装置控制系统的设计

分析了IC封装的扩晶装置复杂多动力系统的动作需求,提出基于AT89S52的运动控制系统的设计方案.结合各执行动作时序图,优化程序,实现并行控制.     

基于恒流源向电感充放电的LVDT设计

针对目前工业测试场合中所用到线性可变差动变压器(LVDT)系统结构与电路组成较复杂,且线性度与灵敏度不高等因素;设计出了一款空心LVDT,用直流恒流源作为其激励信号,由ARM单片机控制开关桥向原线圈充放电,在稳定放电期间,利用单片机的控制逻辑去捕获两个副线圈上的脉冲高度差来进行位移量的测量;最终试验数据表明,该方法所设...