@article{VarykhalovGudatAdamchuketal.2006, author = {Varykhalov, Andrei and Gudat, Wolfgang and Adamchuk, V. K. and Rader, Oliver}, title = {Magic numbers in two-dimensional self-organization of C-60 molecules}, doi = {10.1103/Physrevb.73.241404}, year = {2006}, abstract = {Employing the chemically passive carbon reconstruction W(110)/C-R(15x3) as substrate for deposition of C-60 molecules, we have discovered by scanning tunneling microscopy two-dimensional self-assembly of fullerenes into uniform molecular nanoclusters with "magic" numbers. Our photoemission measurements determine van der Waals forces as the dominating interaction in this self-organizing two-dimensional molecular gas. Based on this, a theoretical determination of the cluster structures in the framework of the Girifalco model gives perfect agreement with the experiment}, language = {en} } @article{MellingerWegenerWirgesetal.2006, author = {Mellinger, Axel and Wegener, Michael and Wirges, Werner and Mallepally, Rajendar Reddy and Gerhard, Reimund}, title = {Thermal and temporal stability of ferroelectret films made from cellular polypropylene/air composites}, year = {2006}, abstract = {Ferroelectrets are thin films of polymer foams, exhibiting piezoelectric properties after electrical charging. Ferroelectret foams usually consist of a cellular polymer structure filled with air. Polymer-air composites are elastically soft due to their high air content as well as due to the size and shape of the polymer walls. Their elastically soft composite structure is one essential key for the working principle of ferroelectrets, besides the permanent trapping of electric charges inside the polymer voids. The elastic properties allow large deformations of the electrically charged voids. However, the composite structure can also possibly limit the stability and consequently the range of applications because of, e. g., penetration of gas and liquids accompanied by discharge phenomena or because of a mechanical pre-load which may be required during the application. Here, we discuss various stability aspects related to the piezoelectric properties of polypropylene ferroelectrets. Near and below room temperature, the piezoelectric effect and the stability of the trapped charges are practically independent from humidity during long-time storage in a humid atmosphere or water, or from operating conditions, such as continuous mechanical excitation. Thermal treatment of cellular polypropylene above -10 degrees C leads to a softening of the voided structure which is apparent from the decreasing values of the elastic modulus. This decrease results in an increase of the piezoelectric activity. Heating above 60 degrees C, however, leads to a decrease in piezoelectricity}, language = {en} } @article{Mikelskis2006, author = {Mikelskis, Helmut F.}, title = {Chaosphysik}, isbn = {3-589-22148-8}, year = {2006}, language = {de} } @article{Mikelskis2006, author = {Mikelskis, Helmut F.}, title = {Die Nanowelt}, isbn = {3-589-22148-8}, year = {2006}, language = {de} } @article{Mikelskis2006, author = {Mikelskis, Helmut F.}, title = {Offener Physikunterricht}, isbn = {3-589-22148-8}, year = {2006}, language = {de} } @article{Mikelskis2006, author = {Mikelskis, Helmut F.}, title = {Die Rolle des Physikbuches beim Unterrichten und Lernen von Physik}, isbn = {3-589-22148-8}, year = {2006}, language = {de} } @article{Mikelskis2006, author = {Mikelskis, Helmut F.}, title = {Physikunterricht als Beitrag zur Bew{\"a}ltigung gesellschaftlicher Schl{\"u}sselprobleme}, isbn = {3-589-22148-8}, year = {2006}, language = {de} } @article{ShklyaevStraube2010, author = {Shklyaev, Sergey and Straube, Arthur V.}, title = {Superexponential droplet fractalization as a hierarchical formation of dissipative compactons}, issn = {1539-3755}, doi = {10.1103/Physreve.82.020601}, year = {2010}, abstract = {We study the dynamics of a thin film over a substrate heated from below in a framework of a strongly nonlinear one-dimensional Cahn-Hilliard equation. The evolution leads to a fractalization into smaller and smaller scales. We demonstrate that a primitive element in the appearing hierarchical structure is a dissipative compacton. Both direct simulations and the analysis of a self-similar solution show that the compactons appear at superexponentially decreasing scales, which means vanishing dimension of the fractal.}, language = {en} } @article{Klamroth2006, author = {Klamroth, Tillmann}, title = {Optimal control of ultrafast laser driven many-electron dynamics in a polyatomic molecule: N-methyl-6-quinolone}, issn = {0021-9606}, doi = {10.1063/1.2185633}, year = {2006}, abstract = {We report time-dependent configuration interaction singles calculations for the ultrafast laser driven many- electron dynamics in a polyatomic molecule, N-methyl-6-quinolone. We employ optimal control theory to achieve a nearly state-selective excitation from the S-0 to the S-1 state, on a time scale of a few (approximate to 6) femtoseconds. The optimal control scheme is shown to correct for effects opposing a state-selective transition, such as multiphoton transitions and other, nonlinear phenomena, which are induced by the ultrashort and intense laser fields. In contrast, simple two-level pi pulses are not effective in state-selective excitations when very short pulses are used. Also, the dependence of multiphoton and nonlinear effects on the number of states included in the dynamical simulations is investigated.}, language = {en} } @article{MellingerFloresSuarezSinghetal.2006, author = {Mellinger, Axel and Flores Su{\´a}rez, Rosaura and Singh, Rajeev and Wegener, Michael and Wirges, Werner and Lang, Sidney B. and Gerhard, Reimund}, title = {High-resolution space-charge and polarization tomography with thermal pulses}, isbn = {3-8007-2939-3}, year = {2006}, abstract = {Die Arbeit wurde am 13.03.2006 mit dem "BEST PAPER AWARD" des deutschen IEEE Instrumentation and Measurement (I\&M) Chapter ausgezeichnet.}, language = {en} } @article{Rabe2006, author = {Rabe, Thorid}, title = {Motivation, Interesse und Selbstkonzept im Physikunterricht}, isbn = {3-589-22148-8}, year = {2006}, language = {de} } @article{Starauschek2006, author = {Starauschek, Erich}, title = {Zur Rolle der Sprache beim Lernen von Physik}, isbn = {3-589-22148-8}, year = {2006}, language = {de} } @article{BeimGrabenAtmanspacher2006, author = {Beim Graben, Peter and Atmanspacher, Harald}, title = {Complementarity in classical dynamical systems}, issn = {0015-9018}, doi = {10.1007/s10701-005-9013-0}, year = {2006}, abstract = {The concept of complementarity, originally defined for non-commuting observables of quantum systems with states of non-vanishing dispersion, is extended to classical dynamical systems with a partitioned phase space. Interpreting partitions in terms of ensembles of epistemic states (symbols) with corresponding classical observables, it is shown that such observables are complementary to each other with respect to particular partitions unless those partitions are generating. This explains why symbolic descriptions based on an ad hoc partition of an underlying phase space description should generally be expected to be incompatible. Related approaches with different background and different objectives are discussed}, language = {en} } @article{WegenerWirgesTiersch2006, author = {Wegener, Michael and Wirges, Werner and Tiersch, Brigitte}, title = {Porous polytetrafluoroethylene (PTFE) electret films : porosity and time dependent charging behaviour of the free surface}, doi = {10.1007/s10934-006-9015-0}, year = {2006}, abstract = {Electrically charged porous polytetrafluoroethylene (PTFE) films are often discussed as active layers for electromechanical transducers. Here, the electric charging behavior of open-porous PTFE films with different porosities is investigated. Optimized electric charging of porous PTFE films is determined by variation of charging parameters such as electric fields and charging times. Maximum surface potentials are depending on the porosity of the PTFE films. Suitable charging leads to high surface potentials observed on non-stretched or slightly stretched porous PTFE films. Further increase of charging fields yields decreasing values of the surface potential accompanied with an increase of conductivity.}, language = {en} } @article{QiuMellingerWirgesetal.2007, author = {Qiu, Xunlin and Mellinger, Axel and Wirges, Werner and Gerhard, Reimund}, title = {Dielectric barrier discharges during the generation of ferroelectrets : optical spectroscopy for process monitoring}, isbn = {978-1-4244-1482-6}, year = {2007}, language = {en} } @article{BassoAltafimAltafimetal.2007, author = {Basso, Heitor Cury and Altafim, Ruy Alberto Pisani and Altafim, Ruy Alberto Pisani and Mellinger, Axel and Fang, Peng and Wirges, Werner and Gerhard, Reimund}, title = {Three-layer ferroelectrets from perforated Teflon-PTFE films fused between two homogeneous Teflon-FEP films}, isbn = {978-1-4244-1482-6}, year = {2007}, language = {en} } @article{WegenerWirgesPaajanenetal.2007, author = {Wegener, Michael and Wirges, Werner and Paajanen, Mika and Gerhard, Reimund}, title = {Charging behaviour and thermal stability of porous and non-porous polytetrafluoroethylene (PTFE) electrets}, isbn = {978-1-4244-1482-6}, year = {2007}, language = {en} } @article{QiuMellingerWegeneretal.2007, author = {Qiu, Xunlin and Mellinger, Axel and Wegener, Michael and Wirges, Werner and Gerhard, Reimund}, title = {Barrier discharges in cellular polypropylene ferroelectrets : how do they influence the electromechanical properties?}, year = {2007}, language = {en} } @article{ReddyPuranikGuptaetal.2007, author = {Reddy, Raghavendra V. and Puranik, Shikha and Gupta, Ajay and Leitenberger, Wolfram}, title = {Study of FePt films prepared by reactive sputtering}, year = {2007}, language = {en} } @article{SeehaferFuhrmannValorietal.2007, author = {Seehafer, Norbert and Fuhrmann, M. and Valori, Gherardo and Kliem, Bernhard}, title = {Force-free magnetic fields in the solar atmosphere}, year = {2007}, language = {en} }