This paper is concerned with the investigation and the modelling of a solid-liquid extraction process and the importance of the influencing factors (solid phase, particle size and liquid-solid ratio). The studied system is a plant material (Geranium Sanguineum – L.) and a solvent mixture – 70 % ethanol in water. From the results, it is clear that the valuable compounds’ extraction rate is much ...

A mathematical model for free-form solid modelling was presented in previous published works. The key aspects of this model are the decomposition of the volume occupied by the solid into non-disjoint cells, and the representation of the solid as an algebraic sum of these cells. Here we apply this scheme to represent CSG solids built by combining free-form solids in boolean operations. As a proo...

The generation of 3D solid objects, and more generally solid geometric modelling, is very important in Computer Aided Design (CAD). This paper presents a simple but effective algorithm for automated display of perspective views of Constructive Solid Geometry (CSG) scene models. This algorithm can be implemented as a module in such a way that it is easily integrated, without any modification, to...

Katrin Koch, ∗ Klaus Koepernik, Dimitri Van Neck, Helge Rosner, and Stefaan Cottenier 4, † Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, DE-01187 Dresden, Germany IFW Dresden, Institute for Solid State Research, P.O. Box 270116, DE-01171 Dresden, Germany Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, BE-9000 Ghent, Belgium Instituut voor Kernen S...

The isogeometric analysis is a rather new variant of the finite element method (FEM). The key concept of this method is to directly employ a geometric model described by parametric functions as a mesh for the FEM. The models for the isogeometric analysis have been usually based on non-uniform rational B-Splines (NURBS). The applications so far include both twoand three-dimensional models. This ...

The paper presents the methodology of modelling tooth flanks of cylindrical gears in the CAD environment. The modelling consists in a computer simulation of gear generation. A model of tooth flanks is an envelope curve of a family of envelopes that originate from the rolling motion of a solid tool model in relation to a solid model of the cylindrical gear. The surface stereometry and topography...

Conventional two dimensional(2D) maps and DTMs are insufficient to represent geographic information in urban space comprising high-rise buildings and underground structures. There is a pressing need for a model of three dimensional(3D) representation of urban space, that is, a Digital Urban Space Model(DUSM). However, existing solid modelling techniques cannot be directly applied to the 3D repr...

Although the equilibrium phase diagram predicts that alloys in the central part of the V-Zr system should consist of V2Zr Laves phase with partial segregation of one element, it is known that under non-equilibrium conditions these materials can form amorphous structures. Here we examine the structures and stabilities of thin film V-Zr alloys deposited at room temperature by magnetron sputtering...