TY  - JOUR
A1  - Thiel, Marco
A1  - Romano, Maria Carmen
A1  - Schwarz, Udo
A1  - Kurths, Jürgen
A1  - Hasinger, Günther
A1  - Belloni, Tomaso
T1  - Nonlinear Time series analysis of the X-ray flux of compact objects
N2  - We analyse the X-ray light curves of compact objects using linear and nonlinear time series analysis methods. A Power Density Spectrum (PDS) describes the overall second order properties of the observed data well. To look beyond we propose the nonlinear Q-statistic to detect an asymmetry of the time series. This allows us to find relevant time scales. This method even grants a subclassification of the known states of X-ray sources.
Y1  - 2001
SN  - 0004-640x
ER  - 
TY  - JOUR
A1  - Sitz, Andre
A1  - Schwarz, Udo
A1  - Kurths, Jürgen
A1  - Maus, Doris
A1  - Wiese, Michael
A1  - Warnecke, Günter
T1  - Signatures of acoustic emission signals generated during high speed cutting
N2  - Acoustic emission signals generated during high speed cutting of steel are investigated. The data are represen ted in time-folded form. Several methods from linear and nonlinear data analysis based on time- and frequency- domain are applied to the data and reveal signatures of the observed acoustic emission signal. These investiga tions are necessary for modeling the cutting process by means of differential equations.
Y1  - 2001
UR  - http://www.agnld.uni-potsdam.de/~shw/Paper/21618.pdf
ER  - 
TY  - JOUR
A1  - Romano, Maria Carmen
A1  - Thiel, Marco
A1  - Schwarz, Udo
A1  - Kurths, Jürgen
A1  - Lange, Holger
A1  - Hauhs, M.
T1  - Conceptual model of runoff from a forested catchment
N2  - We investigate the relationship between precipitation and runoff data from a small forested catchment in the Harz mountains (Germany). For this purpose, we develop a conceptual model including memory effects to predict the runoff signal using the precipitation data as input. An enhanced variant of the model also includes air temperature as input variable. We show in terms of correlation functions that this model describes main dynamical properties of the runoff, especially the delay between rain event and runoff response as the annual persistence in the runoff data.
Y1  - 2001
UR  - http://journals.worldscientific.com.sg/ijbc/11/1110/S0218127401003619.html
ER  - 
TY  - JOUR
A1  - Kurths, Jürgen
A1  - Schwarz, Udo
T1  - Nichtlineare Wissenschaften - neue Paradigmen und Konzepte
N2  - In den letzten 2 Jahrzehnten des 20. Jahrhunderts hat sich mit der rasanten Entwicklung der Nichtlinearen Wissenschaften ein weiterer Umbruch vollzogen, der eine ausgepraegte Nachhaltigkeit in Wissenschaft und Technik ebenso wie in der Gesellschaft erwarten laesst. Die Nichtlinearen Wissenschaften werden auch als Nichtlineare Dynamik, Wissenschaft Komplexer Systeme oder etwas eingegrenzt Chaostheorie bezeichnet.
Y1  - 2001
UR  - http://www.agnld.uni-potsdam.de/~shw/Paper/2001ArtChaos.pdf
SN  - 0177- 3674
ER  - 
TY  - JOUR
A1  - Palus, Milan
A1  - Kurths, Jürgen
A1  - Schwarz, Udo
A1  - Novotná, Dagmar
A1  - Charvátová, Ivanka
T1  - Is the solar activity cycle synchronized with the solar inertial motion?
N2  - The 300 year record of the yearly sunspot numbers and numerically generated trajectory of the solar inertial motion (SIM) were subjects of a synchronization analysis. Phase synchronization of the sunspot cycle and a fast component of the SIM have been found and confirmed with statistical significance in three epochs (1727-1757, 1802-1832 and 1863-1922) of the entire 1700-1997 record. This result can be considered as a quantitative support for the hypothesis that there is a weak interaction of gravity and solar activity.
Y1  - 2001
UR  - http://ejournals.wspc.com.sg/ijbc/10/1011/S0218127400001766.html
ER  -