3D Hair sketching for real-time dynamic & key frame animations

Physically based simulation of human hair is a well studied and well known problem. But the “pure” physically based representation of hair (and other animation elements) is not the only concern of the animators, who want to “control” the creation and animation phases of the content. This paper describes a sketch-based tool, with which a user can both create hair models with different styling parameters and produce animations of these created hair models using physically and key frame-based techniques. The model creation and animation production tasks are all performed with direct manipulation techniques in real-time.     

Über die Anwendung von Ionensensitiven Feldeffekttransistoren zur Untersuchung von Korrosionsvorgängen

On the application of ion sensitive field-effect transistors for the investigation of corrosion phenomena Ion sensitive field-effect transistors (ISFET) are chemical sensors based on semiconductor technology. They exhibit small dimensions, a plane measuring surface and have short response times. Thus, they are very suitable for the determination of local changes of the pH value at electrochemical corrosion studies. The described in this paper experimental set-up allows in situ measurements of the pH value by means of ISFET sensors in amounts of liquids below 1 mm³; the active surface area of the material under test may be below 1 mm². In model tests preferably changes of the pH value of dist. water due to the corrosion of steel St 38 have been investigated. After an initial short-time rise caused by oxygen reduction a decay of the pH value to pH = 3 ?4 was obseved. Furthermore, ISFET sensors have been used as a potential probe for electrochemical polarization measurements in low conductive media. It was shown, that the dynamic behaviour of potentiostatic control circuits may be influenced favourably by the low output resistance of the ISFET.     

Die zweite Phase der Feldbusentwicklung

The past decade may be regarded as the phase of the fundamental developments in fieldbus systems that were based on the OSI model. Today we are entering a second stage. It is the objective of this issue to present the current state and where the further developments will lead to. This introductory article is intended to give an overview on the subject.     

Auswirkungen von Blitzschlägen auf 20-kV-Energiekabel

Recently appeared defects on high voltage cables have required an urgent evaluation of the impact of lightning strikes necessary. In some cases overvoltages between the copper wire screen of the cable and earth may appear which cause damages of the cablesheath. Field measurements with a classification of the voltage impulses at the copper wire screen have been made to evaluate the number of events. Additionally a numerical model was developed to study the effects of atmospheric discharges on underground cables with emphasis to the influence on the cablesheath. This numeric method was also applied to estimate the effectiveness of different protection arrangements. This contribution presents evaluation methods for overvoltages of cables and a model used firstly for calculating the stress caused by differential voltages and secondly to determinate the influence of protection measures.     

Buchbesprechungen

Ohne Zusammenfassung     

38. Generalversammlung von CENELEC

Ohne Zusammenfassung     

Qualitativ-quantitative Simulation, ein Instrument zur Analyse nichtlinearer Regelkreise

Qualitative-quantitative simulation is one of the most productive and promising research areas in Artificial Intelligence to emerge in recent years. This method provides an elegant way for an exhaustive analysis of uncertain dynamic systems. The application of the qualitative-quantitative simulation is shown in this paper. The important question about the stability of a quanlitatively described dynamical system is solved by a novel analytic method.     

Microwave cavity perturbation technique: Part I: Principles

This report reviews the analysis used to extract the complex conductivity of a compound from a microwave cavity perturbation measurement. We intend to present a generalized treatment valid for any spheroidally shaped sample of arbitrary conductivity which is placed at either the electric or magnetic field antinode of the cavity. To begin with, we establish the relationship between the measured parameters and the conductivity for a spherical sample. Next, we extend these results to the case of spheroids; and for the first time, we cover all different configurations that one can possibly use to study an arbitrary conducting sample inside a cavity: in particular, all possible orientations of the sample with respect to the applied field are solved.