期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Terahertz propagation in metal templates
1
作者 HANJia-Guang ZHANGWei ZHUZhi-Yuan WANGZhen-Xia YULi-Ping SUNLi-Tao WANGTing-Tai 《Nuclear Science and Techniques》 SCIE CAS CSCD 2004年第2期86-88,共3页
Terahertz (THz) propagation in a metal template has been theoretically demonstrated. The possible propagating frequencies and power transmittance have been calculated. The power transmittance curves are displayed with... Terahertz (THz) propagation in a metal template has been theoretically demonstrated. The possible propagating frequencies and power transmittance have been calculated. The power transmittance curves are displayed with different incident frequency and different geometric parameters. The oscillations of transmittance dependent on length of the template and the theoretical propagating bandwidth have been found. 展开更多
关键词 金属样板 传播频率 功率透射率 兆兆赫技术 波导管
下载PDF
其它专用涂料
2
《涂料文摘》 1997年第1期57-57,共1页
关键词 专用涂料 卷材涂料 含氟聚合物 抗静电涂层 干燥速率 陶瓷涂料 金属样板 抗粉化性 涂料体系 大学学报
下载PDF
Automatic recognition of intersecting features of freeform sheet metal parts 被引量:2
3
作者 Chun-jie ZHANG Xiong-hui ZHOU Cong-xin LI 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第10期1439-1449,共11页
This paper presents an approach for recognizing both isolated and intersecting geometric features of freeform surface models of parts,for the purpose of automating the process planning of sheet metal forming.The devel... This paper presents an approach for recognizing both isolated and intersecting geometric features of freeform surface models of parts,for the purpose of automating the process planning of sheet metal forming.The developed methodology has three major steps:subdivision of B-spline surfaces,detection of protrusions and depressions,and recognition of geometric features for sheet metal forming domain.The input geometry data format of the part is based on an IGES CAD surface model represented in the form of trimmed B-spline surfaces.Each surface is classified or subdivided into different curvature regions with the aid of curvature property surfaces obtained by using symbolic computation of B-spline surfaces.Those regions satisfying a particular geometry and topology relation are recognized as protrusion and depression(DP) shapes.The DP shapes are then classified into different geometric features using a rule-based approach.A verified feasibility study of the developed method is also presented. 展开更多
关键词 Feature recognition (FR) Freeform surface Feature intersection Sheet metal forming
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部