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  - 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  -