堵水调剖用有机铬交联剂的微胶囊化研究

选择轻质碳酸钙作固化剂,加适量黏合剂(聚乙二醇溶液),将含Cr3+67%的胜利采油院有机铬交联剂(墨绿色液体)固化,按1∶1质量比将固化交联剂与成球促进剂(微晶纤维素)混合,加适量黏合剂,在挤出滚圆机上制成粒度16～32目的素丸,再以乙基纤维素水分散体为包衣剂,在给定工艺条件下用流化床法制成覆膜有机铬交联剂.根据70℃下在水中的铬释放率曲线和聚合物-交联剂体系黏度发展曲线,确定覆膜后最佳热处理温度为60℃,包衣膜厚度(以素丸质量增加率表示)决定延缓交联时间,当素丸质量增加率由10%增大到40%时,实验成胶体系黏度增加到10 Pa·s以上所需的时间由16 h延长到32 h,包衣膜厚度可按要求选择.使用微胶囊化的交联剂可使聚合物溶液成胶时间明显延后.     

适用于灰度图像的EBCOT位平面快速扫描方法

为提高EBCOT位平面编码效率,提出一种适用于灰度图像可分级编码的快速扫描法.通过在第一通道生成列省略标志的游程表,实现第二、第三通道的启发式扫描,实验结果表明在相同的压缩比下,图像质量不受影响,与K.Chen等人提出的GOCS方法比较,三通道扫描时间可缩短约6%.     

汽轮机低压内II缸偏心套筒定位销脱焊处理及防治措施

通过对神皖安庆发电公司2“机低压内Ⅱ缸底部偏心套筒定位销完全脱焊事件的发现、原因分析及处理过程进行展开描述，确认这是一起罕见的由于误将工艺销作为偏心套筒定位销安装而引发的质量事故，并提出了加强工程基建期安装过程管控，做好技术交底，提升业主、监理及施工三方人员责任意识和工作积极性，严控工艺质量以及日常运行维护中注重异常分析等防治措施。     

低温甲醇洗装置试车问题分析及解决措施

对大型煤化工酸性气体脱除采用的低温甲醇洗与NHD工艺进行了对比,概述了低温甲醇洗装置的工艺流程及特点。介绍了低温甲醇洗装置试车经验,重点阐述开车过程中出现的换热器(E6)管程水堵塞、系统导气时CO2彻底吸收、蝶阀调节精度不足和界区阀不能双向密封等问题及解决措施。     

采用有支承校孔代替钻头扩孔加工平顶链铰卷

采用有支承校孔的无切削方法加工铰卷内孔,以达到既能提高产品抗拉强度,又能保证铰卷内孔孔尺寸精度和椭圆度要求,还能提高效率,降低生产成本的目的。     

低压瓦斯增压技术在常减压装置的应用

装置常减压产生的低压瓦斯气进入加热炉燃烧,由于压力不高容易产生火焰飘散、脱火、甚至二次燃烧的情况,给生产稳定性带来一定影响,通过利用压缩机增压技术,提高进入炉膛压力,一方面改善低压瓦斯燃烧效果,提高燃烧效率,另一方面降低加热炉外排烟气CO含量。     

聚砜超滤膜制备中的回归正交设计

本文将回归正交设计应用于聚砜超滤膜的制备中，获得了聚砜浓度、添加剂浓度及纺丝液温度与聚砜超滤膜对ＴＮＴ的截留率、透水速率关系的回归方程，确定出三因素的最优组合，使得该膜对ＴＮＴ的截留率较大，透水速率较高     

土石坝基础塑性混凝土防渗墙材料力学特性研究

本文通过大量的试验着重研究四周压力对塑性混凝土力学特性的影响，提示了塑性混凝土在四周压力加大时呈塑性破坏，其强度、峰值应变有极大的增加，而其初始模量基本无变化的特性、依据试验资料求得的参数，对一典型高土石坝深覆盖层塑性混凝土防渗墙的应力、位移进行了有限元计算，用剪应力动用水平和拉应力值判断其强度方面的安全程度，上述工作为塑性混凝土在中、高土石坝深覆盖层防渗墙中应用的可能性和合理性提供了重要论据。     

Designing a parameter-free Kullback-Leibler information control chart for monitoring process mean shift

This paper proposes a parameter-free Kullback-Leibler information control chart for monitoring sustained shifts in the process mean of a normally distributed process in phase II. Two plotted statistics are provided. One is based on our backward empirical sequential test, the other is based on the maximum log-likelihood ratio change point method. These two achieve similar performances for the control chart. The performance of the proposed chart is compared with those of the cumulative sum chart, the exponentially weighted moving average chart, and the generalized likelihood ratio (GLR) chart. The results show that our proposed chart and the GLR chart have similar performances. Both can detect a wide range of shifts in the process mean, and neither requires design parameters other than the control limits. The proposed chart outperforms GLR when the size of the shift is below 1.24 standard deviations, while GLR outperforms the proposed chart when the size of the shift is above 1.24 standard deviations.     

New CUSUM and dual CUSUM mean charts

The CUSUM (C) charts are well recognized as a potentially advanced process monitoring tools because of their sensitivity against small and moderate shifts. In this paper, we first improve the sensitivity of the Brownian motion–based C (BC) chart with an appropriate transformation, named new BC (NBC) chart, for monitoring moderate and large shifts in the mean of a normal process. Then, using the control charting structure of the Crosier C (CC) chart, we propose the NBCC (NBC with CC structure) chart. In addition, for efficiently detecting a mean shift within an interval, dual version of these control charts are also proposed, named the dual NBC (DNBC) and dual NBCC (DNBCC) charts. Moreover, the fast initial response feature is also incorporated into the proposed charts. Using the Monte Carlo simulation, the run length properties of the proposed charts are computed. The run length performances of the existing and proposed charts are compared using the extra quadratic loss and integral relative average run length as performance criterion. It turns out that the NBC and NBCC (DNBC and DNBCC) charts are uniformly more sensitive than the C, CC, and NBC (dual C and dual CC) charts when detecting the mean shifts in small, moderate, and large intervals, where the DNBCC chart outperforms all considered charts. The proposed charts are also applied on real data sets to support the proposed theory.