TY  - BOOK
A1  - Voss, Henning U.
A1  - Kurths, Jürgen
A1  - Schwarz, Udo
T1  - Reconstruction of grand minima of solar activity from radiocarbon data : linear and nonlinear signal analysis
T3  - Preprint NLD
Y1  - 1996
VL  - 28
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Donner, Reik Volker
A1  - Cser, Adrienn
A1  - Schwarz, Udo
A1  - Otto, Andreas H.
A1  - Feudel, Ulrike
T1  - An approach to a process model of laser beam melt ablation using methods of linear and non-linear data analysis
N2  - As a non-contact process laser beam melt ablation offers several advantages compared to conventional processing mechanisms. During ablation the surface of the workpiece is molten by the energy of a CO2-laser beam, this melt is then driven out by the impulse of an additional process gas. Although the idea behind laser beam melt ablation is rather simple, the process itself has a major limitation in practical applications: with increasing ablation rate surface quality of the workpiece processed declines rapidly. With different ablation rates different surface structures can be distinguished, which can be characterised by suitable surface parameters. The corresponding regimes of pattern formation are found in linear and non-linear statistical properties of the recorded process emissions as well. While the ablation rate can be represented in terms of the line-energy, this parameter does not provide sufficient information about the full behaviour of the system. The dynamics of the system is dominated by oscillations due to the laser cycle but includes some periodically driven non-linear processes as well. Upon the basis of the measured time series, a corresponding model is developed. The deeper understanding of the process can be used to develop strategies for a process control.
Y1  - 2003
SN  - 3-928921-88-6
ER  - 
TY  - BOOK
A1  - Donner, Reik Volker
A1  - Cser, Adrienn
A1  - Schwarz, Udo
A1  - Otto, Andreas H.
A1  - Feudel, Ulrike
T1  - An approach to a process model of laser beam melt ablation using methods of linear and non-linear data analysis
N2  - As a non-contact process laser beam melt ablation offers several advantages compared to conventional processing mechanisms. During ablation the surface of the workpiece is molten by the energy of a CO2-laser beam, this melt is then driven out by the impulse of an additional process gas. Although the idea behind laser beam melt ablation is rather simple, the process itself has a major limitation in practical applications: with increasing ablation rate surface quality of the workpiece processed declines rapidly. With different ablation rates different surface structures can be distinguished, which can be characterised by suitable surface parameters. The corresponding regimes of pattern formation are found in linear and non-linear statistical properties of the recorded process emissions as well. While the ablation rate can be represented in terms of the line-energy, this parameter does not provide sufficient information about the full behaviour of the system. The dynamics of the system is dominated by oscillations due to the laser cycle but includes some periodically driven non-linear processes as well. Upon the basis of the measured time series, a corresponding model is developed. The deeper understanding of the process can be used to develop strategies for a process control.
Y1  - 2004
SN  - 3-527-40430-9
ER  -