上马水库地裂缝成因及工程处理措施探讨

文中着重阐述了上马水库库坝区的地裂缝产生的原因及发育规律,分析了地裂缝对水库的直接危害,为水库除险加固设计提供了指导,并提出了切实可行的工程处理措施建议。     

聚醚多元醇钻井液研制及应用

以新研制的多功能聚醚多元醇SYP-1为主剂,对聚合物包被剂、防塌剂和降滤失剂进行了优选实验.在此基础上,研制了一种新型的聚醚多元醇钻井液.对聚醚多元醇钻井液的抑制性、流变性、滤失造壁性、润滑性以及对油气层的保护性能进行了室内评价实验,并分析了该钻井液的作用机理.在LN3-6H井和HD4-23H井进行的聚醚多元醇钻井液现场试验表明,在钻进过程中井壁稳定,井径规则,起、下钻畅通,井下安全,测井、下套管及固井作业顺利.室内实验和现场应用表明,聚醚多元醇钻井液具有优良的防塌性和润滑性,能有效地抑制岩屑分散,起到稳定井壁和保护油气层的作用,满足复杂地质条件下钻井的需要.     

鄂北地区气测现场解释评价研究

鄂尔多斯盆地鄂北地区现场气测录井由于受多种因素影响,解释符合率相对较低。针对这一问题,在探讨影响气测录井显示因素、识别气测异常的基础上,分析了消除影响因素的途径和校正公式,建立了随钻全烃与全脱全烃的关系式,论述了地面和地层含气量计算方法。在初步评价气显示性质条件下,经统计分析得出了应用4参数——峰面积、校正全烃值、全烃计算值和地层含气量加权分值的解释评价标准,为鄂北地区气测录井解释评价和产能的初步预测探索了一种新模式,不但解决了鄂北地区气测解释符合率低的问题,而且对于深入开展气测录井参数与油气解释评价研究具有一定的参考意义。     

ZnxFe3—xO4的制备及性能

采用合适加剂在碱性溶液中制备了ＦｅＺｎ铁氧体，研究了其形成机理及磁性能，提出ＦｅＺｎ铁氧体的形成机理为：Ａｎ＾２＋＋２Ｆｅ＾３＋＋８０Ｈ＾－→ＺｎＦｅ２Ｏ４＋４Ｈ２Ｏ Ｆｅ＾２＋＋２Ｆｅ＾２＋＋８０Ｈ＾－→Ｆｅ３Ｏ４＋４Ｈ２Ｏ。     

OPS和OPC系列稠油乳化降黏剂的研制

以工业品烷基酚聚氧乙烯醚OP-n（n=4,6,8,10,15）为起始原料,合成了烷基酚聚氧乙烯醚乙酸盐OPC-n和磺酸盐OPS-n两个系列的阴-非离子表面活性剂。以酸值和黏度不同的胜利单家寺和陈庄稠油为实验油样。将OPC-n和OPS-n溶于矿化度5811 mg/kg的胜利标准盐水和NaCl、CaCl2盐水中作为水相,按油、水质量比7∶3在50℃用玻棒搅拌混合,观察是否形成水包油乳状液并测黏度进行确认。在胜利标准盐水溶液中,OPC-n和OPS-n乳化稠油所需的最低质量分数,随稠油、表面活性剂类型及氧乙烯链节数n而变,一般而言,OPC-n系列中的OPC-8和OPS-n系列中的OPS-4乳化稠油的性能最好,该最低质量分数值分别为0.05%或0.025%和0.025%。在NaCl盐水溶液中,OPC-n的该最低质量分数值与稠油和n有关,均随盐含量增加而增大,在盐含量≤15%时,抗盐性最好的OPC-8和OPC-10的该值≤0.05%;OPS-n的抗盐性好于OPC-n。OPC-n的抗钙性良好,钙盐含量为2%时该最低质量分数≤0.1%;OPS-n的抗钙性更好,钙盐含量为2%和3%时该最低质量分数仅为0.025%或0.05%。表6参5。     

带钢窄边线状裂纹缺陷的形成原因及预防措施

本文通过对带钢窄边线状裂纹缺陷的金相显微组织观察和扫描电镜与能谱分析，确定了带钢窄边线状裂纹缺陷的形成原因，并针对原因提出了相应的预防措施，有效地控制了带钢窄边线状裂纹缺陷的重复发生。     

数据库备份与恢复技术研究及应用

针对数据库备份、数据库恢复的概念、技术原理和方法等方面进行了分析和探讨。事实证明,通过借助于网络信息技术、数据库处理技术、网络存储等技术有助于实现企业信息系统的数据库备份与恢复。     

Group technology based adaptive cell formation using predator-prey genetic algorithm

In recent years, there has been a considerable growth of application of group technology in cellular manufacturing. This has led to investigation of the primary cell formation problem (CFP), both in classical and soft-computing domain. Compared to more well-known and analytical techniques like mathematical programming which have been used rigorously to solve CFPs, heuristic approaches have yet gained the same level of acceptance. In the last decade we have seen some fruitful attempts to use evolutionary techniques like genetic algorithm (GA) and Ant Colony Optimization to find solutions of the CFP. The primary aim of this study is to investigate the applicability of a fine grain variant of the predator-prey GA (PPGA) in CFPs. The algorithm has been adapted to emphasize local selection strategy and to maintain a reasonable balance between prey and predator population, while avoiding premature convergence. The results show that the algorithm is competitive in identifying machine-part clusters from the initial CFP matrix with significantly less number of iterations. The algorithm scaled efficiently for large size problems with competitive performance. Optimal cluster identification is then followed by removal of the bottleneck elements to give a final solution with minimum inter-cluster transition cost. The results give considerable impetus to study similar NP-complete combinatorial problems using fine-grain GAs in future.     

Internal-oxide-band formation during oxidation of Ag-Mg alloys

Ag-3a/oMg was oxidized in air over the range of 400–900°C. Internal-oxide bands of MgO formed approximately parallel to the surface, the first band appearing at some finite, but irregular depth below the surface. The region between the surface and the first band appeared to be free of precipitates, but TEM showed that very small clusters, about 50 Å in diameter, formed in the PFZ, causing significant hardness (greater than 300 VHN). The clusters contain more oxygen than that corresponding to stoichiometric MgO. The hardness between oxide bands was also high, but not as high as in the PFZ. The kinetics of thickening of the internal-band region followed the parabolic rate law between 400 and 700° C, with departures from the parabolic law occurring at higher temperatures. The activation energy for the parabolic rate constants was 19.4 Kcal/mol, a value less than the total for oxygen diffusion and oxygen dissolution. The reaction front was planar and parallel to the surface prior to band formation at temperatures of 400–600° C. Nucleation of the first band resulted in nonplanar and nonparallel oxide. Little or no correlation existed between grain boundaries and oxide formation. Nodules of virtually pure silver formed on the surface initially at grain boundaries and subsequently within grains. Nodule formation is attributed to stress-enhanced (resulting from strains associated with precipitation) diffusion of silver to the surface via dislocation pipes. Internal-band formation is discussed in terms of prior data in the literature and various models. It is thought that stress effects (induced by precipitation), nucleation, and clustering of oxygen with Mg play significant roles in causing internal-band formation.     

Modelling of the mist formation in a segmented grinding wheel system

It has been found that using a segmented grinding wheel with a fluid chamber can significantly minimise the quantity of coolant while improving the ground surface integrity. The present investigation aims to explore the fluid flow mechanism in such a wheel system. To this end, the Weber theory for Newtonian jet instability was applied to quantitatively determine the contribution of coolant flow rate to mist and ligament modes. A semi-analytical model was then developed to predict the mist flow rate by taking into account both the grinding parameters and fluid properties. It was shown that the model prediction was in good agreement with experimental measurements. Because of the comprehensive integration of variables in the formulation, the model provides a good fundamental understanding of the mist formation and offers a practical guideline for the selection and use coolant in minimising the mist flow rate.