辽河油田欧52井火山岩油层三元酸压裂酸化工艺技术

辽河油田东部凹陷火山岩油藏较为集中分布．然而常规酸化效果较差．经采用三元酸（粉末硝酸、盐酸和氢氟酸）前置液压裂酸化后．获得显著的增产效果，进一步表明该项酸化工艺技术成熟，宜于推广应用。同时也面临技术集成再创新机遇．适应更广泛的地质需求。     

大型预焙铝电解槽使用碳化硅砖与普通碳砖复合块的探讨

碳化硅砖和碳化硅砖与普通碳砖复合侧块，在上世纪末期我国铝电解槽上开始推广应用。使用后各厂家普遍发现碳化硅砖及碳化硅砖与普通碳块复合侧块均出现不同程度的断裂、上抬和脱落现象，该文对断裂、上抬和脱落原因进行了分析，并提出了改进措施。     

杜84断块超稠油开发中后期稳产对策研究

对杜84断块超稠油生产中后期暴露的主要矛盾，即随着轮次升高，周期吞吐效果变差，井下技术状况日益变差。油层动用不均，汽窜加剧等问题进行了分析。并提出了相应的稳产对策-实施多井整体吞吐，大修复产，调剖等措施。现场应用证明，这些措施基本能够确保杜84断块超稠油中后期的稳产。     

Helicoseir as Shape of a Rotating String (I): 2D Theory and Simulation Using ANCF

A physically simple but mathematically cumbersome problem of rotating heavy string with one fixed top point was studied. A nonlinear equation of its two-dimensional shapes of relative equilibrium was obtained and solved numerically. A linear case of small displacements was analyzed in terms of Bessel functions. The qualitative and quantitative behavior of the problem is discussed with the help of a bifurcation diagram. Dynamics of the two-dimensional model near the equilibrium positions were studied with the help of a simulation using the absolute nodal coordinate formulation (ANCF); the equilibriums were found to be instable. The reason for instability is explained using a variational principle. The outlines for further full three-dimensional analysis are briefly proposed in this paper, and the full derivation will be explained in the next paper.     

Stability Criteria of Underground Workings under Zonal Disintegration of Rocks

Using the energy approach as the base, the criteria are developed for brittle rock failure in outcropping in the workings driven in the rock masses of different degree of disturbance. A method is presented for estimating the stability of workings under conditions of zonal disintegration.     

Influence of load and speed on wear characteristics of grey cast iron in dry sliding — selection for minimum wear

The wear of grey cast iron in dry sliding conditions has been studied with the aims of (1) finding the influence of working conditions on the wear rate, and (2) determining the region of speed and load where low wear is accomplished. Grey cast iron with flake and nodular graphite was submitted to investigation using a pin-on-disc machine. The results indicate that the flake graphite cast iron is more suitable for applications at speeds greater than 4 m s⁻¹ and lower loads, while nodular cast iron has greater wear resistance at lower speeds in the range of loads investigated - from 50 N cm⁻² to 200 N cm⁻²     

带有集中质量的分布质量弹性转动横振精确解

求得了带有集中质量的分布质量弹性转轴系统横向自由振动的频率方程和振型函数的精确解析表达式，及其与不转动轴系统自由振动的频率方程和振型函数及转动角速度之间的精确解析关系     

二次混合机改造

南钢烧结厂二次混合机通过降低筒体的仰角、提升筒体的转速,增加了混合料的混匀时间,提高了混合料的造球效率,介绍了设计中各种部件的选型和校核计算,该设备投产后大幅度提高了生产能力。     

攀钢“501”滑动水口液压驱动系统的研制

介绍了为攀钢“５０１”滑动水口研制的专用液压驱动系统，对该系统的工作原理，性能特点，主要元件（设备）的选择原则等作了较为详细的说明介绍。