TY - JOUR A1 - Neumann, Werner A1 - Kasper, Sabine A1 - Kasper, Roberto T1 - Discharge Currents in Polymer Solids between Blocking Contacts Y1 - 1991 SN - 0-7803-0113- 7 ER - TY - JOUR A1 - Reiche, Jürgen A1 - Dietel, Reinhard A1 - Lemmetyinen, Helge A1 - Janietz, Dietmar A1 - Lemmetyinen, Helge A1 - Brehmer, Ludwig T1 - Edge-on Langmuir-Blodgett multilayers derived from disc-shaped multiyne mesogens N2 - Langmuir-Blodgett(LB) multilayers were prepared from disc-shaped multiyne mesogens based on amphiphilic alkyl pentakis(aryl-ethynyl)benzene ethers. The two compounds used are characterized by five hydrophobic flexible chains and one hydrophilic substituent at the terminal position of the alkoxy chain. The LB films were analysed by X-ray scattering and spectroscopic measurements. An edge-on arrangement of the two discotic pentaalkynes within Y-type bilayers with a different packing density proved to be possible for the LB films of both compounds. Y1 - 1992 ER - TY - JOUR A1 - Reiche, Jürgen A1 - Pietsch, Ullrich A1 - Fink, Hans-Peter A1 - Lemmetyinen, Helge T1 - A comparison fo x-ray methods for structure refinement of Langmuir-Blodgett multilayers N2 - The possibilities and limits of structure refinement of Langmuir-Blodgett films by means of symmetrical reflection of X- rays are described using the example of a stearic acid multilayer. Three different techniques for the determiantion of the electron density profile from reflectivity data are compared; a Fourier method, a Patterson method, and model calculations. The important role of the a priori information for finding the besft structure model is outlined. Y1 - 1992 ER - TY - JOUR A1 - Mikelskis, Helmut T1 - Combining issues of "girl-suited" science teaching, STS and constructivism in a physics textbook Y1 - 1992 SN - 0157-244X ER - TY - JOUR A1 - Hubrig, Swetlana A1 - Mathys, Gautier T1 - Mass loss, magnetic field and chemical inhomogenities in the he-weak star HD 21699 Y1 - 1993 ER - 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 - 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 - TY - JOUR A1 - Werner, Klaus A1 - Barstow, Martin A. A1 - Holberg, J. B. A1 - Koester, D. A1 - Nousek, J. A. T1 - Extreme ultraviolet spectroscopy of white dwarfs Y1 - 1994 ER - TY - JOUR A1 - Reiche, Jürgen A1 - Barberka, Thomas Andreas A1 - Janietz, Dietmar A1 - Hofmann, Dieter A1 - Pietsch, Ullrich A1 - Brehmer, Ludwig T1 - X-ray structure investigation and computer modelling of Langmuir-Blodgett films formed from disc-shaped pentaalkines Y1 - 1994 ER - TY - JOUR A1 - Liperovskaya, E. V. A1 - Pochotelov, O. A. A1 - Liperovsky, Viktor A. A1 - Oleynik, M. A. A1 - Meister, Claudia-Veronika A1 - Christakis, N. T1 - A comparison of seismic and anthropogenic effects in the night-time sporadic E-layer of the ionosphere Y1 - 1994 ER - TY - JOUR A1 - Baier, Frank W. A1 - McGillivray, H. T. A1 - Flin, P. A1 - Krywult, J. T1 - The imadmissibility of radial number density profiles of galaxy clusters Y1 - 1994 ER - TY - JOUR A1 - Angelova, Angelina A1 - Penacorada, Florencio A1 - Stiller, Burkhard A1 - Zetzsche, Thomas A1 - Ionov, Radoslav A1 - Kamusewitz, Helmut A1 - Brehmer, Ludwig T1 - Wettability, surface morphology and stability of long chain ester multilayers obtained by different Langmuir- Blodgett deposition type Y1 - 1994 ER - TY - JOUR A1 - Janietz, Dietmar A1 - Festag, R. A1 - Schmidt, C. A1 - Wendorff, Joachim Heinz T1 - Self-organization of new oligomers containing disc-shaped side groups Y1 - 1994 ER -