钛白粉副产物硫酸亚铁生产硫酸铵和氧化铁红的研究

以硫酸法钛白粉副产物绿矾为原料 ,生产硫酸铵和铁红粉 .用含臭氧 ( 5 0 0mg/h)的空气在5 0℃将FeCO3氧化成Fe2 O3·nH2 O .通过煅烧制铁红产品 ,其质量达HO0 1 - 0 2 一级品要求 ;硫酸铵通过净化、除杂、浓缩、结晶 ,生产一级品硫铵 .实验证明 ,本工艺氧化时间短 ,产品质量稳定     

“实录”与“虚构”——试论唐叙事诗的叙事手法

唐叙事诗是我国文人叙事诗发展的一个高峰,其虚实相生的叙事手法值得探究。文章从传统诗学和叙事学角度对其进行分析。     

信息化条件下任职士官计算机课程教学改革初探

针对任职士官计算机水平与部队信息化建设要求不相适应的现实问题,深入调查分析了某部队任职士官计算机水平的现状与实际需求,明确了士官任职教育计算机教学的目标,进而有针对性地提出了任职士官计算机课程教学改革的几点新思路,确保课程教学真正服务于部队,服务于实战。     

高分2号图像业务化大气校正查找表的设计与实现

为实现高分2号图像(GF2)业务化大气校正,利用矢量6S模型(6SV)将辐射传输散射与吸收进行分离计算,其中散射部分采用涵盖各种大气模式、气溶胶类型、成像几何等条件下的大气校正查找表(look-up tables,LUTs)表示,大气吸收部分采用6SV拟合计算的6种大气模式下大气透过率的经验公式表示,这种处理有效简化了查找表大小.在内存4 GB、主频3.10 GHz条件下,通过比较基于本查找表方法和基于FLAASH大气校正软件对北京地区一景GF2数据处理.结果表明:以6SV模型直接大气校正法结果作为真值,两者的绝对误差分别为0.8%和2.6%,处理时间分别为77 s和240 s,该大气校正查找表在处理精度和效率更加适合业务化大气校正.     

高速公路联网系统车道收费软件的设计与实现

通过对当前常用的车道收费软件的分析对比,提出了一种基于Mini Server战术的车道收费软件的体系结构,并就其实现技术及性能特点进行了详细的论述,还对Mini Server控制下多Agent通信策略等方面进行了较深入的描述。     

Abnormal growth of austenite grain of low-carbon steel

Niobium is an important alloying element for the steel. To know further the effect of Nb in the steel, the contrast experiments on the austenite grain growth of the 0.015%Nb and free Nb steels were carried out using Gleeble 1500 thermomechanical simulator. The experimental results indicate that the austenite grain of 0.015%Nb steel is finer than that of Nb free steel at 1150–1230 °C. And when the heating temperature arrives the critical temperature 1240 °C, the austenite grain of Nb steel suddenly grows up, while the austenite grain of Nb free steel changes little. Finally, the austenite grain of Nb steel is obviously coarser than that of Nb free steel. By transmission electron microscopy (TEM) using a carbon extraction replica technique, the precipitates of Nb(C,N) were not observed in the 0.015%Nb steel. It is concluded that the grain-boundary internal adsorption of Nb atoms leads to the result.     

超细片状铝粉和铝银浆的制备

超细鳞片状铝粉和铝银浆由于其特殊的二维平面结构，具有良好的遮盖力、显著的屏蔽效应、光学反射能力；超细鳞片状铝粉和铝银浆颜料的制备方法很多，本文采用机械化学法制备超细鳞片状铝粉和铝银浆。     

07Cr12NiMoVNb耐热钢疲劳性能研究

对07Cr12NiMoVNb钢进行了常温和550℃旋转弯曲疲劳试验,结果表明,此钢不同晶粒度时疲劳断裂行为相近,室温疲劳强度与静强度关系符合奥金格经验公式,高温疲劳强度与静强度有关,但直线关系的系数不同于常温的,需重新总结。晶粒度大小影响疲劳强度,但室温表现的不明显,550℃表现为细晶钢疲劳强度高,这正好与蠕变行为相反,粗晶钢表现出较高的蠕变强度。     

一种高效的视图维护算法

通过选择性算法将增量式视图维护和视图自维护有效地融合在一起．同时它还利用相关性算法对不相关更新进行过滤，可以有效地降低消息总数和数据的通信量，从而大大提高视图维护的效率，具有现实的应用意义．     

Extrapolation Model of High Temperature Creep for 12Cr1MoV Steel

The creep curves of heat resistant steel 12Cr1MoV was investigated. by constant stress creep tests. The creep curves of constant stress creep are quite different from that of constant load creep. The original θ- Concept Project procedure can be validated to successfully describe the constant stress creep curves but not constant load creep. A modified θprocedure was developed. This approach can successfully described both constant stress creep and constant load creep curves. The new approach leads to a great improvement in accuracy of long term prediction of extrapolation due to validation of a great number of existing constant load creep data.