大连港成为东北亚航运中心的几点建议

从大连港的优势及不足着手，从加强优势、弥补不足的思路出发，对进一步加强大连港建设。进而加快把大连建设成为东北亚航运中心提出几点建议。     

A review of the effect of a／W ratio on fracture toughness （Ⅰ）—experimental investigation in EPFM

Many experimental investigations have previously been performed and recently done on different shipbuilding structural steels where the specimens size and crack depth/specimen width (a/W) were varied. A series of interesting results have been gained. It is worthwhile to have a review on the effect of a/W ratio on fracture toughness, and further theoretical analysis is necessary. In this paper, experimental work in elasticplastic fracture mechanics (EPFM) was discussed. Tests had been carried out on 10 kinds of strength steels. Results showed that J _i and δ₁ values increased with decreasing a/W when a/W<0.3 for three-point bend specimens and that shallow crack specimens which have less constrained flow field give markedly higher values of toughness than deeply notched specimens. However, for a/W>0.3, the toughness was found to be independent of a/W. Slip line field analysis shows that for shallow cracks, 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 structure defects especially if initiation values of COD/J-integral are used.     

船舶环境中作为中央信息源的产品模型

在造船ＣＡＤ／ＣＡＭ系统中，产品模型是在设计的过程中逐渐建立起来的，它包吟啊几何形状以及几何形态之外的信息。在与设计过程中平行开展的工作中，由于吸收了与已被初步的建造策略以及分段结构初步设计等方面有关的生产准备信息，使产品模型得到了进一步充实。零部件制造过程所需要的信息，如图纸、零件明细表以及数控（ＮＣ）设备所需的信息，都可从该产品模型中提取。如生产准备阶段的工作能与产品模型结合起来，则分段的零件     

应用MicroCDS／ISIS系统建立管理数据库

本文主要介绍了ＭｉｃｒｏＣＤＳ／ＩＳＩＳ精报检索系统的特点，功能及具体应用该软件建立数据库的方法。