TY  - INPR
A1  - Witt, Annette
A1  - Kurths, Jürgen
A1  - Krause, F.
A1  - Fischer, K.
T1  - On the validity of a model for the reversals of the Earth‘s magnetic field
N2  - We have used techniques of nonlinear dynamics to compare a special model for the reversals of the Earth's magnetic field with the observational data. Although this model is rather simple, there is no essential difference to the data by means of well-known characteristics, such as correlation function and probability distribution. Applying methods of symbolic dynamics we have found that the considered model is not able to describe the dynamical properties of the observed process. These significant differences are expressed by algorithmic complexity and Renyi information.
T3  - NLD Preprints - 4 
Y1  - 1994
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-13460
ER  - 
TY  - INPR
A1  - Kurths, Jürgen
A1  - Voss, A.
A1  - Witt, Annette
A1  - Saparin, P.
A1  - Kleiner, H. J.
A1  - Wessel, Niels
T1  - Quantitative analysis of heart rate variability
N2  - In the modern industrialized countries every year several hundred thousands of people die due to the sudden cardiac death. The individual risk for this sudden cardiac death cannot be defined precisely by common available, non-invasive diagnostic tools like Holter-monitoring, highly amplified ECG and traditional linear analysis of heart rate variability (HRV). Therefore, we apply some rather unconventional methods of nonlinear dynamics to analyse the HRV. Especially, some complexity measures that are basing on symbolic dynamics as well as a new measure, the renormalized entropy, detect some abnormalities in the HRV of several patients who have been classified in the low risk group by traditional methods. A combination of these complexity measures with the parameters in the frequency domain seems to be a promising way to get a more precise definition of the individual risk. These findings have to be validated by a representative number of patients.
T3  - NLD Preprints - 5 
Y1  - 1994
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-13470
ER  - 
TY  - JOUR
A1  - Janietz, Dietmar
A1  - Hofmann, Dieter
A1  - Reiche, Jürgen
T1  - Molecular organization of amphiphilic disc-shaped penta-alkynes in LB-mono- and multilayers
N2  - Amphiphilic disc-shaped penta-alkynes were studied with regard to their molecular organization in Langmuir-Blod- gett (LB) mono- and multilayers. It was found that each compound investigated forms edge-on arranged stable monolayers at the air-water interface. LB-multilayers derived from fivefold pentyl-substituted pentaynes are characterized by an edge-on ordering of the molecules within Y-type bilayers. One of these compounds, containing a hydoxy substituent as hydrophilic head group, is exemplified and two possible rectangular molecular assemblies perpendicular to the substrate, each with a columnar in-plane packing, will be discussed as a result of molecular modelling. Based on the experimental results, hexagonal layer packing in the LB-film of a disc-shaped penta-alkynyl carboxylic acid without lateral substituents proved to be possible, which, furthermore, could be confirmed by molecular mechanics simulation.
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
A1  - Bechthold, Jeff
A1  - Hor, P.-H.
A1  - Lorenz, Bernd
A1  - Spatz, J. P.
T1  - High pressure study of the temperature dependence of the conductivity of template synthesized polyaniline and polypyrrole
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
A1  - Bechthold, Jeff
A1  - Hor, P.-H.
A1  - Lorenz, Bernd
A1  - Spatz, J. P.
T1  - High pressure conductivity of template synthesized polypyrrole
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Knochenhauer, Gerald
T1  - Numerische Simulation und Röntgenbeugung an thermisch aufgedampften Multischichten perfluorierter Fettsäuren
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Lorenz, Bernd
A1  - Spatz, J. P.
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
A1  - Bechthold, Jeff
A1  - Hor, P.-H.
T1  - Dimensional crossover of the temperature dependence of the electrical conductivity of template synthesized polyaniline and polypyrrole
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Lorenz, Bernd
A1  - Tozer, S. W.
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
T1  - Magnetoresistance of conducting polymers
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Lorenz, Bernd
A1  - Spatz, J. P.
A1  - Weishaupt, K.
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
A1  - Bechthold, Jeff
A1  - Hor, P.-H.
T1  - Observation of crossover from three to two dimensional variable range hopping in template synthesized polypyrrole and polyaniline
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Barberka, Thomas Andreas
A1  - Knochenhauer, Gerald
A1  - Woolley, Martin
A1  - Pietsch, Ullrich
T1  - Comprehensive structure investigation and computer modelling of perfluorododecanoic acid multilayers formed by in-vacuo thermal evaporation
Y1  - 1994
ER  -