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Karen Johnston and Vagelis Harmandaris
Properties of Short Polystyrene Chains Confined Between Two Gold Surfaces Through a Combined Density Functional Theory and Classical Molecular Dynamics Approach
Soft Matter; ; 2012;
http://pubs.rsc.org/en/Content/ArticleLanding/2012/SM/C2SM25567G
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David Laroze, Javier Martinez-Mardones and Harald Pleiner
Benard-Marangoni instability in a linear viscoelastic magnetic fluid
Ann. Trans. Nordic Rheol. Soc.; 20; 2012; xx
http://www.mpip-mainz.mpg.de/~pleiner/papers/MarangBenard.pdf
In this manuscript we report theoretical and numerical results on the convection of a magnetic fluid with a viscoelastic carrier liquid. The viscoelastic properties are given by the linear Oldroyd model or equivalently by linear relaxing elasticity. We take the lower interface to be rigid, whereas the upper, free one is assumed to be non-deformable and flat. At that interface the surface tension varies linearly with the temperature. Using a spectral method we calculate numerically the convective thresholds for both, stationary and oscillatory bifurcation. The effects of viscoelasticity and of a magnetic field on the instability thresholds are emphasized. -
David Laroze, David Becerra-Alonso, Jason. A. C. Gallas, and Harald Pleiner
Magnetization dynamics under a quasiperiodic magnetic field
IEEE Trans. Mag.; xx; 2012; yyyyy
http://www.mpip-mainz.mpg.de/~pleiner/papers/Quasiperiod.pdf
In the present work we study the deterministic spin dynamics of an anisotropic magnetic particle in the presence of a time dependent magnetic field using the Landau-Lifshitz-Gilbert equation. In particular, we study the case when the magnetic field consists in two terms. One is perpendicular to the anisotropy direction and has quasiperiodic time dependence, while the other term is constant and parallel to the anisotropy direction. We numerically characterize the dynamical behavior of the system by monitoring the Lyapunov exponents, and by calculating Poincaré sections and Fourier spectra. In addition, we calculate analytically the corresponding Melnikov function which gives us the bifurcations of the homoclinic orbits. We find a rather complicated landscape of sometimes closely intermingled chaotic and non-chaotic areas in parameters space. Finally, we show that the system exhibits strange nonchaotic attractors. -
Sania Maurer, Ann Junghans, Thomas A. Vilgis
Impact of xanthan gum, sucrose and fructose on the viscoelastic properties of agarose hydrogels
Food Hydrocolloids; ; 2012;
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