Sub-μ\mu structured Lotus Surfaces Manufacturing

Sub-micro structured surfaces allow modifying the behavior of polymer films or components. Especially in micro fluidics a lotus-like characteristic is requested for many applications. Structure details with a high aspect ratio are necessary to decouple the bottom and the top of the functional layer. Unlike to stochastic methods, patterning with a LIGA-mold insert it is possible to structure surfaces very uniformly or even with controlled variations (e.g. with gradients). In this paper we present the process chain to realize polymer sub-micro structures with minimum lateral feature size of 400 nm and up to 4 micrometers high.Comment: Submitted on behalf of EDA Publishing Association (http://irevues.inist.fr/handle/2042/16838

Operationalization of Topology of Sustainable Management to Estimate Qualitatively Different Regions in State Space

To apply the framework of Topology of Sustainable Management (TSM) by Heitzig et al. (2016) to dynamical models, we connect it to viability theory (VT) via a variant definition of the former. This enables us to use the Saint-Pierre algorithm to estimate the main partition of TSM, improving the operationalization of TSM. Furthermore, we present an extension of the algorithm to compute implicitly defined capture basins, a notion from VT that is more elaborated in the article, as these come up in TSM. We use a low- complexity model coupling environmental and socio-economic dynamics to demonstrate the applicability of this approach. Two common problems of estimations in VT are critical for this example: (i) an unbounded state space and (ii) highly varying time scales. We solve both by introducing appropriate coordinate transformations. These solutions are applicable for general systems, too

A directional occlusion shading model for interactive direct volume rendering

Volumetric rendering is widely used to examine 3D scalar fields from CT/MRI scanners and numerical simulation datasets. One key aspect of volumetric rendering is the ability to provide perceptual cues to aid in understanding structure contained in the data. While shading models that reproduce natural lighting conditions have been shown to better convey depth information and spatial relationships, they traditionally require considerable (pre)computation. In this paper, a shading model for interactive direct volume rendering is proposed that provides perceptual cues similar to those of ambient occlusion, for both solid and transparent surface-like features. An image space occlusion factor is derived from the radiative transport equation based on a specialized phase function. The method does not rely on any precomputation and thus allows for interactive explorations of volumetric data sets via on-the-fly editing of the shading model parameters or (multi-dimensional) transfer functions while modifications to the volume via clipping planes are incorporated into the resulting occlusion-based shading