The relations between prestressed reinforcements in two directions and the total balance loading of unbonded prestressed dual concrete slabs are established in the present paper based on the analysis of projects , in which the structural cost is optimized satisfying the requirements of the service state , the ultimate state and constructions 本文在对无粘结预应力双向板两个方向平衡荷载分配方案分析的基础上，建立了以两个方向预应力筋面积与总平衡荷载的关系式，在满足极限状态、正常使用极限状态和构造要求的条件下，使结构的造价达到最佳。
Based on the analysis of available multicast authentication schemes , two multicast packet authentication schemes are presented . it is shown that these two schemes have advantages in resisting packet - loss , communication overhead , computation complexity etc , and thus they are suitable for multicast environment 文章在对目前的多播认证方案分析的基础上，提出了两个多播数据包认证方案，分析表明，这两个方案在抗丢包能力，通信代价、计算代价等方面都获得较好的性能，适用于两种不同的多播环境。
In the first part of this article , the background of project eastern pearl garden is introduced . and then , in the second part , after the two preliminary alternatives of project eastern pearl garden are compared , financial inner return ratio ( firr ) and financial net present value ( fnpv ) and payback all meet the requirements , but the second alternative is better 本文在案例部分介绍了东珠花园项目的基本情况，在案例分析部分通过对东珠花园项目初步规划的两个方案的对比分析，两个方案的财务指标：财务内部收益率( firr ) 、财务净现值( fnpv )及投资回收期均能满足要求，但第二方案明显优于第一方案分析。
This paper will be key to study the transform scheme on the systematic unit that is concerned with and needs for satisfying on each unit design . part for unload ship equipment , transfer and transport equipment , the access ability of storage yard , shipment and assign redundant technology and so on , the research will make optimization analysis , and carry out the transform scheme 本文将重点研究系统改造涉及的各个单元，对各单元的不同需要不同特点作了分析，分别对卸船设备、转运及输送设备、堆场存取能力、装船及分流工艺等环节进行方案分析，继而提出具体的改造方案。
Clarifies that " boiler is a kind of process system " , and builds boiler ' s abstract process - system model . based on in - depth survey and design review in some boiler factories ; divides boiler project design into four sub - processes : project construction , project analysis , project evaluation , and project adjustment , and elaborates the designer ' s activity in these sub - processes respectively 在对锅炉的工厂设计工作进行充分调研和总结的基础上，将锅炉方案设计活动分解为“方案创造” 、 “方案分析” 、 “方案评价”和“方案调整”四项子活动，并对设计者在各项子活动中的设计行为进行了详细分析。
