邯钢西区煤气管网改造及效果分析

介绍了邯钢为减少煤气放散，节约能源，采用环网供应混合煤气的有效方法。提高了供气可靠性，取得了很好的经济效益。     

基于预测与优先级缓存的MIPv6切换算法

为了提升移动IPv6的切换性能,保证实时性要求高的音频、视频等业务的服务质量,针对去除DAD过程的RDMIPv6方案未考虑在传输速率相对较慢的无线信道中,移动节点向NAR本地注册所产生的时延以及切换过程中引入的丢包问题,提出一种优化方案PCRD-MIPv6。PCRD-MIPv6方案结合基于L2触发的切换预测和数据包优先级缓存机制,在L2切换完成之前向移动节点MN维护的接入路由器缓存列表T_AR中的所有AR发送MOA实现本地注册,与此同时,将切换过程中的数据包按优先级缓存在PAR中,在切换完成后发往移动节点,从而减少切换过程中的丢包率。NS-2仿真结果表明,PCRD-MIPv6方案有效地减少了切换时延,降低了切换过程中的丢包率。     

接收机运动情况下天线简谐运动对信道循环平稳性影响的分析

在均匀散射环境下,当天线做简谐运动时,信道中会引入循环平稳.通过分析信道循环平稳的产生机理,定义了循环平稳度来衡量引入的循环平稳.首先当接收机以恒速做直线运动且接收机上的天线做简谐运动时,研究了信道的自相关特性,包括循环平稳性;然后用Matlab仿真工具绘出有关曲线,仿真实验结果更加清晰地显示了信道的循环平稳性;最后揭示了信道循环平稳的研究意义,并对其在该领域的应用前景进行了展望.     

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)     

一种反梯度自适应插值算法

针对边缘方向插值算法计算量大、边界的处理效果不理想,而自适应放大算法对权值因子的选择太过简单的问题,提出了一种新算法。根据数字图像边缘区域的灰度值变化强烈,而非边缘区域的灰度值变化比较平滑的特点,在边缘处沿边缘方向作线性插值,非边缘区域则采用反梯度自适应插值的方法。试验结果表明,此算法不仅能降低运算复杂度,还能获得清晰的图像边缘,进一步提高了插值图像的视觉质量。     

一种飞机目标的瞄准点选择方法

随着红外成像制导武器与目标不断接近,目标图像在跟踪末端快速增大直至溢出视场,因此必须跟踪目标的局部特征。为了有效摧毁目标,应选择其要害点作为瞄准点,通过分析飞机的红外图像特征,提出了以飞机尾焰为参照确定瞄准点的方法,该方法对飞机机身图像的质量要求不高。仿真结果表明了该方法的有效性。     

Mo(Ⅵ)-HMPF-CTMAB光度法测定食品中微量钼

研究了三元配合物Mo(Ⅵ)-2-羟基-3-甲氧基苯基荧光酮(HMPF)-CTMAB的显色条件.最大吸收波长λmax=525.00nm,试剂最大吸收波长为λmax=465.00nm,对比度60nm,ε525=1.30×105L·moL-1·cm-1,钼的浓度0～15μg/25mL,服从比尔定律,该体系选择性好、方法简便、快速,用于食品中微量钼的测定,结果令人满意.     

浅谈中国焦化废水处理技术进展及其应用

介绍了目前中国焦化废水治理现状,综述了焦化废水治理技术中的生物法、化学法、生物一化学法和生物脱氮技术的原理、应用及其进展,并提出了各种方法存在的问题。     

行波管电镀铜螺旋线高温处理后变色问题的实验分析

对行波管螺旋线电镀铜工艺进行了描述和分析,从实验上阐明了烧氢后螺旋线表面颜色变化的原因。实验分析表明,Ni-Cu合金化反应是导致颜色变化的主要原因,而合金化的结果使表面电导率、热导率大大降低,因此,电镀铜工艺不适合于行波管螺旋线的表面处理。在此基础上,对螺旋线镀铜工艺的其他技术方案进行了评述。     

A modified Johnson–Cook model for 30Cr2Ni4MoV rotor steel over a wide range of temperature and strain rate

The compressive behaviors of 30Cr2Ni4MoV rotor steel were investigated at the temperatures from 1223 to 1523 K and strain rates from 0.001 to 0.1 s⁻¹. A modified Johnson–Cook (JC) model was proposed to describe the compressive behaviors of the studied alloy steel. In the modified JC model, the coupling effects of strain, strain rate, and deformation temperature were considered. Comparisons between the predicted stress–strain values by the modified JC model and measured ones indicate a good agreement, which confirms that the modified JC model is valid for the predicting the flow stress of 30Cr2Ni4MoV rotor steel over a wide range of temperature and strain rate.