Geometric modeling and analysis of bone micro–structures as a base for scaffold design

Author(s):  
Y. Holdstein ◽  
L. Podshivalov ◽  
A. Fischer
2017 ◽  
Vol 16 (6) ◽  
pp. 3476-3491 ◽  
Author(s):  
Raul Hernandez-Aquino ◽  
Syed Ali Raza Zaidi ◽  
Mounir Ghogho ◽  
Des McLernon ◽  
Ananthram Swami

Author(s):  
Jackson Crane ◽  
Xian Shi ◽  
Jonathan T. Lipkowicz ◽  
Andreas M. Kempf ◽  
Hai Wang

Algorithms ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 257
Author(s):  
Xiaoguang Wang ◽  
Jun Yang ◽  
Jian Guo ◽  
Jun Guo

In the demonstration phase of a missile scheme, to obtain the optimum proposal, designers need to modify the parameters of the overall structure frequently and significantly, and perform the structural analysis repeatedly. In order to reduce the manual workload and improve the efficiency of research and development, a general integrated method of missile structure modeling, analysis and optimization was proposed. First, CST (Class and Shape transformation functions) parametric method was used to describe the general structure of the missile. The corresponding software geometric modeling and FEM (Finite Element Method) analyzing of the missile were developed in C/C++ language on the basis of the CST parametric method and UG (Unigraphics) secondary development technology. Subsequently, a novel surrogate model-based optimation strategy was proposed to obtain a relatively light mass missile structure under existing shape size. Eventually, different missile models were used to verify the validity of the method. After executing the structure modeling, analysis and optimization modules, satisfactory results can be obtained that demonstrated the stability and adaptability of the proposed method. The method presented saves plenty of time comparing to the traditional manual modeling and analysis method, which provides a valuable technique to improve the efficiency of research and development.


2019 ◽  
Vol 101 ◽  
pp. 71-80 ◽  
Author(s):  
Jun Wang ◽  
Chenyan Cao ◽  
Shujie Cui ◽  
Zengli Wang

Author(s):  
Kumar Sambhav ◽  
Puneet Tandon ◽  
Sanjay G. Dhande

The presented work models the geometry of Single Point Cutting Tools (SPCTs) with generic profile. Presently few standard shapes of SPCTs defined in terms of projective geometry are being employed while there is a need to design free-form tools to efficiently machine free-form surfaces with few passes and chosen range of cutting angles. To be able to produce SPCT face and flanks with generic shapes through grinding, a comprehensive geometric model of the tool in terms of the varying grinding angles and the ground depths is required which helps design the tool with arbitrarily chosen tool angles. The surface modeling begins with the creation of a tool blank model followed by transformation of unbounded planes to get the cutting tool surfaces. The intersection of these surfaces with the blank gives the complete model of the tool. Having created the geometric model in two generations of generalization, the paper presents the methodology to obtain the conventional tool angles from the generic model. An illustration of the model has been provided showing variation of tool angles along the cutting edge with changing grinding parameters. When the geometric model is not to be related to the grinding parameters, the SPCT can be modeled as a composite NURBS surface which has been presented towards the end of the work.


Author(s):  
M.E. Lee ◽  
A. Moller ◽  
P.S.O. Fouche ◽  
I.G Gaigher

Scanning electron microscopy of fish scales has facilitated the application of micro-structures to systematics. Electron microscopy studies have added more information on the structure of the scale and the associated cells, many problems still remain unsolved, because of our incomplete knowledge of the process of calcification. One of the main purposes of these studies has been to study the histology, histochemistry, and ultrastructure of both calcified and decalcified scales, and associated cells, and to obtain more information on the mechanism of calcification in the scales. The study of a calcified scale with the electron microscope is complicated by the difficulty in sectioning this material because of the close association of very hard tissue with very soft tissues. Sections often shatter and blemishes are difficult to avoid. Therefore the aim of this study is firstly to develop techniques for the preparation of cross sections of fish scales for scanning electron microscopy and secondly the application of these techniques for the determination of the structures and calcification of fish scales.


1981 ◽  
Vol 64 (10) ◽  
pp. 18-27
Author(s):  
Yoshio Hamamatsu ◽  
Katsuhiro Nakada ◽  
Ikuo Kaji ◽  
Osamu Doi

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