MDT参数化设计机械标准件

讨论了如何利用Auto CAD中的开发工具Autolisp语言及MDT参数化设计模块进行标准件-轴承座的参数化设计.     

内燃机粉末冶金阀座材料的发展概况

综述了阀座的磨损状况，介绍了几种国外厂家研制的粉末冶金阀痤的成分和性能。     

发射器座板强度的有限元分析

文中通过采用有限单元法．对某发射器座板进行强度分析和强度计算．以找出整个座板的结构应力和变形分布规律．为合理布置筋板和减轻座板重量提供理论依据。     

引进循环流化床锅炉15CrMo汽包管座与St45.8Ⅲ降水管厚壁异口径高压管道的焊接

引进芬兰的循环流化床锅炉，其汽包返包中国。降水管采用了德国碳素钢St45.8Ⅲ，与降水管相连的汽包管座采用了国产珠光体耐热钢15CrMo。该焊接头为高压、厚壁、异口径的焊接。文中介绍焊口所在的结构形式及工作条件，分析异种材料的焊接性能，并对其焊接及热处理工艺措施作了全面阐述。     

汽车发动机粉末冶金阀座圈合金进展——无铅汽油、LPG、CNG、柴油发动机用

评述了无铅汽油、LPG、CNG、柴油汽车发动机用粉末冶金气门座圈合金的各项使用性能。扼要叙述了生产工艺要点，以及合金的研制开发程序。     

排气门阀座成形模结构分析

简要分析发动机排气门阀座结构形状及工况特性，介绍阀座成形模拟计算特点，及其在生产实践中应用的实例，这种成形模是结构能满足并保证排气门阀座的批量生产及使用要求。     

钨合金砧模与基座联结方式的效益分析

介绍了钨合金砧模的工作特性，分析了钨合金砧模与基座的几种联结方式的优、缺点。指出：自锁式V型联结，砧模与基座间始终保持紧密接触，具有自锁作用，故模的导电性及散热性良好，使用寿命明显提高，可取得较好的经济效益。     

Airline seat allocation competition

This paper examines the classical seat allocation problem under competition between two airlines with different cost structure. The cost asymmetry that has been ignored in the yield management literature can be caused by either operations or distributions. We investigate the decision problem of two airlines offering two identical fare classes under both the simultaneous and sequential allocations. For both allocation cases, we show the existence, uniqueness and stability of pure‐strategy Nash equilibrium under a reasonable condition on the ratios of relative profit margins of the two fare classes. We find that there will be fewer seats protected for the full‐fare class if the discount seats can be booked first. We found that the asymmetry in costs has two effects on the equilibrium solutions: (a) an airline behaves aggressively for the fare class where it enjoys a cost advantage; (b) an airline tends to balance the trade‐offs internally when it has absolute cost advantage in both fare classes. In deriving the collusive solution for both cases for comparative purposes, we discover new insights by solving the two‐flight, two‐fare seat allocation problem with different cost structures on the two flights. In particular, we show that rivalry in full‐fare seat protection leads to a Prisoners' Dilemma for the carriers. Finally, a numerical example is used to illustrate various analytical results.     

含断层的煤层底板TIN构模中数据组织

在分析煤层底板空间信息特点的基础上，以三角形为构模单元，讨论了煤层底板的空间构模的数据组织和底板各要素之间的拓扑关系，并在此数据模型的基础上实现了煤层底板的表面建模。