新型DCS—μXL的控制机能体系

本文介绍最新中小规模集散型控制系统—μXL的控制机能体系及其技术特点。     

Stress variation of soil surrounding tunnel and grouting reinforcement effect based on stress release

With FLAC, a criteria of stress release ratio （SRR）, i.e., about 10% of the relative difference of the ground settlement before and after the supporting system is installed, is incorporated into stress release method （SRM）. At the same time, the Mohr-Coulomb Criterion is used to analyze stress changes around the tunnel induced by excavation. It shows that the surrounding soil around shallow tunnels can be partitioned by loosened zones （unloading zones） and plastic zones among which the shear stresses in the soil are less than 10 kPa below the M-C yield line. Both types of zones are separated. With the increasing of the SRR, the areas of plastic zones and loosen zones gradually increase. The surrounding soil is equally divided into 24 regions in order to study the influence of different grouting regions on the ground settlement. The reinforcing effect of grouting can be modeled by enhancement of the soil strength around the tunnel. By the approach of the SRM, numerical analysis indicates that, in the upper area （top of the surrounding soil about 210°）, the reinforcing effect gradually decreases as the reinforcing region moves from arch springing to the vault of the crown; when reinforcing regions lie in the upside of the surrounding soil, the influence on the ground settlement is generally greater than in the lower part; at the same time, with the increase of the SRR, the influential differences are more and more obvious.     

基于数值模拟方法的中心起爆战斗部破片动态飞散特性研究

针对中心点起爆方式战斗部破片毁伤区域的预测问题，以破片动力学基本方程为基础，同时考虑破片速度沿战斗部轴向变化以及破片飞散方向等影响因素，采用数值模拟方法对战斗部破片在不同时刻、不同工况破片速度与破片空间分布的动态飞散特性开展研究。研究表明：破片动态飞散场呈现对称于弹体纵轴的空心锥结构；随着飞散时间的增加，破片径向速度逐渐减小，飞散半径逐渐增大，破片场形状则由弧形向U形转变；并且对于质量8 g的立方体破片，当破片飞散46.5 ms后，对轻型装甲目标仍具有毁伤能力；破片初始飞散速度相同，增大破片质量可以提高破片场的飞散范围，增强破片存速能力。该研究成果可为目标高效毁伤以及引战一体化设计提供依据。     

乙二醛的应用,生产及其发展前景

综述了乙二醛的性质，应用和两种工业生产方法，并分析了其发展前景。     

SMA共聚物的热性能研究

苯乙烯－马来酸酐共聚物是一类特种热塑性材料，具有很好的耐热性和可加工性，且能与多种树脂共混。以促使ＳＭＡ树脂掺混到多个体系，开发出系列高性能工程塑料合金。     

无机／有机复合微粒电流变和磁流变效应研究

采用反相乳液聚合方法制备了铁／聚丙烯酸锂和γ－Ｆｅ２Ｏ３／聚丙烯酸锂两种复合微粒，将其分别分散于硅油中形成电磁流变体，考察了其电流变和磁流变效应的大小及其微粒结构的影响。结果表明，与γ－Ｆｅ２Ｏ３／聚丙烯烯酸锂相比，铁／聚丙烯酸锂具有较强的磁流变效应。     

围岩变形对粘结式锚杆的影响

巷道开挖后,在围岩中埋入粘结式锚杆,尔后的围岩变形必然在锚杆中引起轴向力,围岩因此受到剪力作用。此剪力对围岩起到维护和支撑作用。本文根据粘结式锚杆的边界条件,利用明德林解得到锚杆的轴向力为同时得到了锚杆位移和岩体所受剪力的数值解。在计算锚杆轴向力的过程中,本文引用了R.米开和E.斯特恩白格的明德林积分解。