单射线折射波能分布计算(水波线性理论)

通过对水波折射线性理论的述评，提出折射现象的若干基本事实 ，对于（相对）缓坡，利用底侧壁面对入射波的全反射作用和近似的波幅矢平衡原理，求得缓坡上单射线折射波能分布算式，结果与传统的波向线法接近，对于（相对）陡坡和大控制行进角，根据相应的基本事实 ，引入马赫反射特征，改造缓坡单射线公式，得到陡坡上单射线折射波能分布的计算公式（群）。     

The effect of plastic constraint on the initiation of ductile tears in shipbuilding structural steels

In this paper, the effect of plastic constraint on the initiation of ductile tears in four different shipbuilding structural steels has been experimentally studied by measuring the J-integral and crack opening displacement COD at initiation in three-point bend specimens with deep and shallow notches. Experimental results of seven groups of different strength alloy steels show that both Si and Ji values of ductile tear from the shallow crack specimens which have less constraint flow field are significantly higher than those of deeply notched specimens. Slip-line-field analysis shows that, for shallow crack, the hydrostatic stress is lower than that from standard deeply cracked bend specimen, which develops a high level of crack tip constraint, provides a lower bound estimate of toughness, and will ensure an unduly conservative approach when applied to structural defects, especially if initiation values of COD and J-integral are used.     

某轮主机活塞环异常断裂原因分析

此文结合活塞环的工作条件，对某轮主机气环异常断裂原因进行了分析，并针对该故障的诱发原因对柴油机日常维护管理提出了建议。     

实现万能报表方法的研究及软件设计

为了能够满足医院各部门对信息系统数据库中的数据进行统计分析的需求，实现对原有医院信息系统中数据信息进行查询和统计，研究并设计出万能统计报表的编制和打印软件，能够实现灵活地查询医院信息系统中的各种数据信息；有效地解决了信息查询、分类统计的瓶颈问题。文中阐述了该软件的设计目标、实现方法、系统功能及处理流程。