Acoustics - measurement of sound insulation in buildings and of building elements - part 3 : laboratory measurements of airborne sound insulation of building elements - amendment 1 : installation guidelines for lightweight twin leaf partitions 声学.建筑物和建筑元件隔音测量.第3部分:建筑物元件气载噪声隔绝的试验室测量.修改件1 :轻型双叶隔板的安装指南
This thesis is about the design and engineering analysis of a new type of bileaflet artificial heart valve . it can be divided into three main parts : theoretical calculation of the valve , computer aided design , engineering analysis 本论文的内容是关于一种新型的双叶型人工心脏瓣膜的设计与工程分析，可以划分为三个主要部分：人工心瓣的结构理论计算、计算机辅助设计以及计算机辅助工程分析。
Acoustics - measurement of sound insulation in buildings and of building elements - part 1 : requirements for laboratory test facilities with suppressed flanking transmission - amendment 1 : specific requirements on the frame of the test opening for lightweight twin leaf partitions 声学.建筑物和建筑构件的隔声测量.第1部分:能抑制侧向传声的实验室试验装置的要求.修改件1 :轻型双叶隔板用开度测试框架的特殊要求
This study is based on the analyses of a series of different types of artificial heart valve in home and abroad . to overcome the shortcoming of existed artificial heart valve , several forms of bileaflet mechanical heart valve are developed . after a thorough comparison and analysis of the characters of these forms , some ideal structures are selected to be manufactured 本文的研究工作是对国内外诸多瓣膜产品进行深入分析研究的基础上开展的，为了克服人工心脏瓣膜存在的各种弊端，本文提出了三种结构形式的双叶瓣，并就各种结构形式的特点进行分析比较。
After comparing and analyzing all kinds of valve products in world , this paper based on technology achievement of changing property by all - fix ionic pouring , overcomes faults of old valves . this paper puts out two new types valve . it improves the axis parts , and the style of the leaflet surface 本论文的研究工作是在对国内外诸多人工心瓣产品进行了深入分析和比较之后，以双叶型机械瓣为研究方向，力争克服目前使用的双叶瓣的各种弊端，以材料表面全方位离子注入改性重大技术成果为设计基础，提出了两种结构形式的双叶机械瓣。
