Periodic surface modeling for computer aided nano design

2007 ◽  
Vol 39 (3) ◽  
pp. 179-189 ◽  
Author(s):  
Yan Wang
Keyword(s):  
Surface Modeling ◽  
Periodic Surface ◽  
Computer Aided

Degree Operations on Periodic Surfaces

2007 ◽  
Author(s):  
Yan Wang
Keyword(s):  
Surface Model ◽  
Implicit Surface ◽  
Periodic Surface ◽  
Degree Elevation ◽  
Periodic Surfaces ◽  
Computer Aided ◽  
Particle Aggregates

In previous work, a periodic surface model for computer-aided nano-design (CAND) was developed. This implicit surface model can construct Euclidean and hyperbolic nano geometries parametrically and represent morphologies of particle aggregates and polymers. In this paper, we study the characteristics of degree elevation and reduction based on a generalized periodic surface model. Methods of degree elevation and reduction operations are developed in order to support multi-resolution representation and model exchange.

Research and Application of NURBS Surface Modeling Technique in Computer Aided Industrial Design

2011 ◽  
Vol 121-126 ◽  
pp. 3461-3465
Author(s):  
Bo Zhao ◽  
Ping Ai
Keyword(s):  
Industrial Design ◽  
Surface Modeling ◽  
Modeling Technique ◽  
Practical Application ◽  
Nurbs Surface ◽  
Application Process ◽  
Product Models ◽  
Computer Aided ◽  
Hard Problems ◽  
The Common

NURBS surface modeling technique is an important part of computer aided industrial design(CAID), and surface modeling has much advantage. This thesis bases on the statistics and comparison of current CAID practical application methods and techniques, concludes the common CAID techniques, the thinking methods and application process of surface categorization in surface modeling from the basic theory of NURBS surface modeling; and together with concrete cases, this thesis also proposes an solution for the common hard problems in the process of using NURBS technique to build 3D product models.

A Survey of Computer-Aided Modeling Tools for Aesthetic Design

2002 ◽  
Vol 2 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Chiara Eva Catalano ◽  
Bianca Falcidieno ◽  
Franca Giannini ◽  
Marina Monti
Keyword(s):  
Industrial Design ◽  
Surface Modeling ◽  
Modeling Tools ◽  
Aesthetic Design ◽  
Computer Aided ◽  
Critical Issues ◽  
Key Issues ◽  
European Projects ◽  
Industrial Designers

The goal of this paper is to discuss the key issues in the computer-aided surface modeling tools used in the industrial aesthetic design workflow and to highlight the problems that still make styling activities difficult. Based on the experience gained while working on two different European projects, with the collaboration of industrial designers of different fields, a general industrial design workflow is illustrated, pointing out the main differences between the automotive and non-automotive sectors. Among the emerged critical issues, particular emphasis is given to the high request of tools more suitable for the mentality of creative users; short research surveys aimed to meet this request are included, and finally authors indicate a branch of research in which they are investigating and they consider particularly worth exploring further.

scholarly journals SURFACE MODELING FOR CAD/CAM BASED ON NURBS

2011 ◽  
Vol 14 (4) ◽  
pp. 44-52
Author(s):  
Hien Tat Le ◽  
Hung Xuan Nguyen ◽  
Cang Trong Vo
Keyword(s):  
Computer Aided Design ◽  
Geometric Modeling ◽  
Surface Modeling ◽  
Digital Design ◽  
Nurbs Surface ◽  
Computer Aided ◽  
Modeling Techniques ◽  
Cad Cam ◽  
Numerical Performance ◽  
Aided Design

In the digital design process, surface modeling is required to be as accurate as possible for the effective support of production as well as for numerical performance analysis. This article reviews the geometric modeling techniques, based on non-uniform rational B-spline (NURBS). The NURBS surface can be readily translated into many CAD/CAM packages (Computer Aided Design/Computer Aided Manufacturing), which is more convenient for visualization performance and finite element methods.

Feature-Based Crystal Construction in Computer-Aided Nano-Design

2008 ◽  
Author(s):  
Cheng Qi ◽  
Yan Wang
Keyword(s):  
Material Design ◽  
Surface Model ◽  
Periodic Surface ◽  
Periodic Surfaces ◽  
Nano Structures ◽  
Rapid Construction ◽  
Computer Aided ◽  
Feature Based ◽  
Basic Features ◽  
Complex Crystal

Providing nano engineers and scientists efficient and easy-to-use tools to create geometry conformations that have minimum energies is highly desirable in material design. Recently we developed a periodic surface model to assist the construction of nano structures parametrically for computeraided nano-design. In this paper, we present a feature-based approach for crystal construction. The proposed approach starts to create models of basic features by the aide of periodic surfaces followed by operations between basic features. The goal is to introduce a rapid construction method for complex crystal structures.

Computer-aided methods for 3-D visualization of serial sections and thick biological specimens

1992 ◽  
Vol 50 (2) ◽  
pp. 1060-1061
Author(s):  
Mark Ellisman ◽  
Maryann Martone ◽  
Gabriel Soto ◽  
Eleizer Masliah ◽  
David Hessler ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Three Dimensional ◽  
Neuritic Plaque ◽  
Dimensional Structure ◽  
Data Sets ◽  
Molecular Physiology ◽  
Research Activities ◽  
Computer Aided ◽  
Dimensional Reconstruction

Structurally-oriented biologists examine cells, tissues, organelles and macromolecules in order to gain insight into cellular and molecular physiology by relating structure to function. The understanding of these structures can be greatly enhanced by the use of techniques for the visualization and quantitative analysis of three-dimensional structure. Three projects from current research activities will be presented in order to illustrate both the present capabilities of computer aided techniques as well as their limitations and future possibilities.The first project concerns the three-dimensional reconstruction of the neuritic plaques found in the brains of patients with Alzheimer's disease. We have developed a software package “Synu” for investigation of 3D data sets which has been used in conjunction with laser confocal light microscopy to study the structure of the neuritic plaque. Tissue sections of autopsy samples from patients with Alzheimer's disease were double-labeled for tau, a cytoskeletal marker for abnormal neurites, and synaptophysin, a marker of presynaptic terminals.

A Stationary Solution of High-Energy Electron Reflection (HEER) for An Arbitrary Surface

1990 ◽  
Vol 48 (2) ◽  
pp. 374-375
Author(s):  
YIQUN MA
Keyword(s):  
Stationary Solution ◽  
High Energy ◽  
Bloch Wave ◽  
Dynamical Theory ◽  
High Energy Electron ◽  
Bulk Materials ◽  
Periodic Surface ◽  
Electron Transmission ◽  
Electron Reflection ◽  
Long Time

For a long time, the development of dynamical theory for HEER has been stagnated for several reasons. Although the Bloch wave method is powerful for the understanding of physical insights of electron diffraction, particularly electron transmission diffraction, it is not readily available for the simulation of various surface imperfection in electron reflection diffraction since it is basically a method for bulk materials and perfect surface. When the multislice method due to Cowley & Moodie is used for electron reflection, the “edge effects” stand firmly in the way of reaching a stationary solution for HEER. The multislice method due to Maksym & Beeby is valid only for an 2-D periodic surface.Now, a method for solving stationary solution of HEER for an arbitrary surface is available, which is called the Edge Patching method in Multislice-Only mode (the EPMO method). The analytical basis for this method can be attributed to two important characters of HEER: 1) 2-D dependence of the wave fields and 2) the Picard iteractionlike character of multislice calculation due to Cowley and Moodie in the Bragg case.

Three-Dimensional Subcellular Organization of Hepatocytes in Intact Liver: Simultaneous Visualization of Cytoskeletal and Membrane Markers by Confocal Microscopy

1996 ◽  
Vol 54 ◽  
pp. 288-289
Author(s):  
Greg V. Martin ◽  
Ann L. Hubbard
Keyword(s):  
Three Dimensional ◽  
Integral Membrane Proteins ◽  
Polarized Secretion ◽  
Microscope Images ◽  
Computer Aided ◽  
Intracellular Organelles ◽  
Cytoskeletal Elements ◽  
Simultaneous Visualization

The microtubule (MT) cytoskeleton is necessary for many of the polarized functions of hepatocytes. Among the functions dependent on the MT-based cytoskeleton are polarized secretion of proteins, delivery of endocytosed material to lysosomes, and transcytosis of integral plasma membrane (PM) proteins. Although microtubules have been shown to be crucial to the establishment and maintenance of functional and structural polarization in the hepatocyte, little is known about the architecture of the hepatocyte MT cytoskeleton in vivo, particularly with regard to its relationship to PM domains and membranous organelles. Using an in situ extraction technique that preserves both microtubules and cellular membranes, we have developed a protocol for immunofluorescent co-localization of cytoskeletal elements and integral membrane proteins within 20 µm cryosections of fixed rat liver. Computer-aided 3D reconstruction of multi-spectral confocal microscope images was used to visualize the spatial relationships among the MT cytoskeleton, PM domains and intracellular organelles.

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