3 . production craftwork of main prefabrications and construction technics of the whole system are described in this thesis and the stress is put on the construction methods of the in - situ sandwich floor boards and the design of its supporting system , combined with current relative construction criterion and the special traits of the system , providing construction reference for the system 结合现行有关施工规范及体系的具体特点，讨论了主要预制件的生产工艺和体系的施工工艺，重点阐述了现浇双向密肋夹芯楼盖的施工方法，详细介绍了该类楼盖施工支撑体系的设计、选择和组装，为该类体系的施工提供参考。
In the thesis , 61 - 81vol . % sip - al composites were prepared by al - alloys melt infiltration into si particles porous preforms without external pressure . si particles porous preforms preparation , spontaneous melt infiltration process , solidification of al - si alloys melt in the interspaces among si particles , microstructures and thermal properties of the composite , were systematically investigated in the work 本文采用无压浸渗工艺制备高体积含量si _ p al复合材料，对si颗粒多孔预制件的制备、液态al合金熔体对si多孔体的浸渗过程、凝固特点、复合材料的微观组织和热物理特性进行了理论与实验研究。
The system adopts the standard windows user interface , has characters of computing fast , handling easily and friendly interface . it is made up of the file subsystem , the drawing subsystem and the process design subsystem on arranging yarns , it has realized the functions of drawing graph , picking graph , editing graph , saving graph and process designing 该系统采用windows标准界面，运算速度快，用户接口友好，主要由文件子系统、绘图子系统和排纱设计子系统组成，实现了三维编织预制件的横截面的图形绘制、拾取、编辑、存储等功能，并可以实现工艺设计中的排纱设计。
This paper expounds corner detection method to get the position information of every braided unit ' s climaxes . and then the braided units " localization can be realized with these climaxes information . when realized the braided units " localization , feature model can be constituted by every unit ' s information 系统通过对复合材料预制件表面编织花节中特征顶点的提取，实现编织花节的定位，并根据提取的顶点信息求得编织花节的花节长度和编织角信息，进而根据这些特征建立特征模型，根据特征模型对预制件表面编织均匀性进行检测。
3 - dimensional 5 - directional braiding composites improve the axial mechanical properties of the composites by inserting the axial fibers . in the second section , the paper studied the microstructure of 3 - dimensional 5 - directional braiding preform and its reinforced composites . the unit model is established 三维五向编织复合材料改善了普通三维四向编织复合材料在沿预制件成型方向抗张、抗扭、抗剪切强度的不足，倍受重视，因此，本文第二章系统地研究了三维五向编织复合材料预制件及其增强的复合材料的细观结构。
