检索结果-南通市图书馆

Geometric Bone Modeling:From Macro to micro structures

Journal of Computer Science & Technology 2010年第3期25卷 614-622页

作者： Oded Zaideman Anath Fischer Laboratory for Computer Aided Design & Life Cycle Engineering Faculty of Mechanical Engineering Technion Israel Institute of Technology

There is major interest within the bio-engineering community in developing accurate and non-invasive means for visualizing, modeling and analyzing bone micro-structures. Bones are composed of hierarchical bio-composite materials characterized by complex multi-scale structural geometry. The process of reconstructing a volumetric bone model is usually based upon CT/MRI scanned images. Meshes generated by current commercial CAD systems cannot be used for further modeling or analysis. Moreover, recently developed methods are only capable of capturing the micro-structure for small volumes （biopsy samples）. This paper examines the problem of re-meshing a 3D computerized model of bone micro- structure. The proposed method is based on the following phases： defining sub-meshes of the original model in a grid-based structure, remeshing each sub-mesh using the neural network （NN） method, and merging the sub-meshes into a global mesh. Applying the NN method to micro-structures proved to be quite time consuming. Therefore, a parallel, grid-based approach was applied, yielding a simpler structure in each grid cell. The performance of this method is analyzed, and the method is demonstrated on real bone micro-structures. Furthermore, the method may be used as the basis for generating a multi-resolution bone geometric model.

关键词： bone modeling micro-structures micro CT (#CT) scanning technology

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

THREE-DIMENSIONAL MODELING FOR THIN PLATE-LIKE structures INCLUDING SURFACE EFFECTS BY USING STATE SPACE METHOD

引用

Acta Mechanica Solida Sinica 2010年第3期23卷 260-270页

作者： Hongyu Sheng Pin Lu Institute of Civil Engineering Hefei University of Technology Hefei 230009 China Institute of Materials Research and Engineering A ^＊STAR (Agency for Science Technology and Research) 3 Research Link Singapore 117602

A three-dimensional （3-D） approach based on the state space method is proposed to study size-dependent mechanical properties of ultra-thin plate-like elastic structures considering surface effects. The structure is modeled as a laminate composed of a bulk bounded with upper and bottom surface layers, which are allowed to have different material properties from the bulk layer. State equations, including the surface properties of the structure, can be established on the basis of 3-D fundamental elasticity to analyze the size-dependent static characteristics of the thin plate-like structure. Compared with two-dimensional plate theories based size-dependent models for thin film structures in literature, the present 3-D approach is exact, which can provide benchmark results to assess the accuracy of 2-D plate theories and various numerical approaches. To show the feasibility of the proposed approach, a 3-D analytical solution for a simply supported plate-like thin structure including surface layers is derived. An algorithm is proposed for the calculation of the state equations obtained to ensure that the numerical results can reveal the surface effects clearly even for extremely thin surface layers. Numerical examples are carried out to exhibit the surface effects and some discussions are provided based on the results obtained.

关键词： micro-structures surface effects size-dependence state equation three-dimensional modeling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

microstructures OF ULTRAFINE WC POWDERS

引用

中国有色金属学会会刊：英文版 1994年第2期4卷 42-46页

作者： Sun,Xiaohua Wang,Mingpu Tu,Yuanjun Zeng,Zhaoming Hu,Xiamei(Central South University of Technology,Changsha 410083)

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＯＦＵＬＴＲＡＦＩＮＥＷＣＰＯＷＤＥＲＳＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＯＦＵＬＴＲＡＦＩＮＥＷＣＰＯＷＤＥＲＳ￥Ｓｕｎ，Ｘｉａｏｈｕａ；Ｗａｎｇ，Ｍｉｎｇｐｕ；Ｔｕ，Ｙｕａｎｊｕｎ；Ｚｅ... 详细信息

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＯＦＵＬＴＲＡＦＩＮＥＷＣＰＯＷＤＥＲＳＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＯＦＵＬＴＲＡＦＩＮＥＷＣＰＯＷＤＥＲＳ￥Ｓｕｎ，Ｘｉａｏｈｕａ；Ｗａｎｇ，Ｍｉｎｇｐｕ；Ｔｕ，Ｙｕａｎｊｕｎ；Ｚｅｎｇ，Ｚｈａｏｍｉｎｇ；Ｈｕ，Ｘｉ...

关键词： tungsten carbide ultrafine powder micro-structures cemented carbide

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：