Refine
Year of publication
Document Type
- Article (4200)
- Doctoral Thesis (782)
- Postprint (137)
- Monograph/Edited Volume (120)
- Other (84)
- Preprint (44)
- Review (35)
- Habilitation Thesis (24)
- Conference Proceeding (15)
- Master's Thesis (11)
Keywords
- diffusion (58)
- stars: massive (56)
- gamma rays: general (47)
- anomalous diffusion (45)
- stars: early-type (45)
- cosmic rays (43)
- stars: winds, outflows (42)
- Magellanic Clouds (39)
- radiation mechanisms: non-thermal (38)
- X-rays: stars (37)
Institute
- Institut für Physik und Astronomie (5455) (remove)
Amphiphilic discotic pentakis (arylethynyl) benzene compounds 1 and 2 containing an enlarged aromatic core functioning as a chromophoric p-electron system were studied with regard to their photophysical properties within Langmuir-Blodgett (LB) films. The results obtained from steady-state absorption as well as fluorescence excitation and emission measurements will be discussed with regard to interchromophoric interactions in the LB films. Time-resolved fluorescence inves6igations revealed the formation of a ground-state complex as well as excimer formation. Thermal treatment causes irreversible destruction of the LB film structure of the discotic amphiphiles. Within droplets the reorganization of the original nematic-discotic (ND) mesophase of the bulk materials was found for the alcohol 2 as indicated by a Maltese Cross texture, whereas the acid 1 remained isotopic.
Elektrochemische Untersuchungen aromatischer 1,3,4-Oxadiazole in Lösungen und als dünne Schichten
(1995)
Eine neue Methode zur Charakterisierung der Dilatationseigenschaften dünner organischer Schichten
(1995)
Phasentransformationen in Cd-Stearat-Multischichten bei unterschiedlichen Metallionenkonzentrationen
(1995)
Ortsaufgelöste Untersuchung der Orientierung von geordneten Schichten mittels FTIR-Spektroskopie
(1995)
Optische Geräte
(1995)
Anmerkungen über das uneingelöste Rekonstruktionsproblem in Curriculumentwicklung und Fachdidaktik
(1995)
Study of gas transport through composite membranes with a stabilised Langmuir-Blodgett skin layer
(1995)
The Langmuir-Blodgett (LB-) technique is used to deposit molecular reinforced separation layers on porous polymer substrates resulting in composite membranes for gas separation. The adsorption of a polycation to the arachidic acid Langmuir layer and the subsequent transfer of the highly ordered and stabilised monolayer onto a polypropylene membrane (Cellgard 2400) yields a laminated separation layer combining the advantageous high degree of order of fatty acid films and the stability of thin polymeric films. X-ray reflectivity data of these films confirm the transfer of the assembled polymer layer together with the fatty acid monolayer and the formation of ordered Y-type LB-films. SFM pictures show a dense film without pinholes completely covering the porous support. Gas permeation measurements are used to study the transport process of different gases through the composite membrane.
Analytische Bildfehlertheorie für leicht dezentrierte optische Systeme mit inhomogenen Medien
(1995)
Influence of collisional heating on the current generation in moving mid-latitude sporadic E-layers
(1995)
Einfluss des Transferverhältnisses auf die Monoschichtsymmetrie in Y-Typ Langmuir-Blodgett-Schichten
(1995)
Preparation and characterization of ordered thin films based on aromatic poly(1,3,4-oxadiazole)s
(1995)
Influence of collisional heating on the current generation in moving mid-latitude sporadic E-layers
(1995)
Spectra of GW Vir pulsators
(1995)
The observation of a new high pressure phase transition in tetramethyl ammonium tetrabromocuprate
(1995)
Formation of cubic boron nitride in the system Mg3N2-BN : a new contribution to the phase diagram
(1995)
We demonstrate the occurrence of regimes with singular continuous (fractal) Fourier spectra in autonomous dissipative dynamical systems. The particular example in an ODE system at the accumulation points of bifurcation sequences associated to the creation of complicated homoclinic orbits. Two different machanisms responsible for the appearance of such spectra are proposed. In the first case when the geometry of the attractor is symbolically represented by the Thue-Morse sequence, both the continuous-time process and its descrete Poincaré map have singular power spectra. The other mechanism owes to the logarithmic divergence of the first return times near the saddle point; here the Poincaré map possesses the discrete spectrum, while the continuous-time process displays the singular one. A method is presented for computing the multifractal characteristics of the singular continuous spectra with the help of the usual Fourier analysis technique.