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Inversion walls in homeotropic nematic and cholesteric layers
We describe the experimental properties of metastable domains associated with the presence of an Inversion Wall (IW) and observed with homeotropically anchored nematic and cholesteric liquid crystalsExpand
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Excitability and Defect-Mediated Turbulence in Nematic Liquid Crustal
We report the observation of one-arm spiral waves and of turbulence states in a nematic slab subjected to an external forcing. These one-arm spiral waves constitute a close analog to the spiral wavesExpand
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On the critical equilibrium of the spiral spring pendulum
Physical systems such as an inverted pendulum driven by a spiral spring, an unbalanced Euler elastica with a travelling mass, a heavy body with a parabolic section and an Ising ferromagnet are veryExpand
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Ising-Bloch transition in a nematic liquid crystal
We consider a nematic slab with homeotropic anchoring and investigate the effect of a magnetic field, H, parallel to the plates and an electric field, E, perpendicular to them (e a 0). The magneticExpand
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Excitability in liquid crystal.
The spiral waves observed in a liquid crystal submitted to a vertical electric field and a horizontal rotating magnetic field are explained in the framework of a purely mechanical description of theExpand
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Interface dynamics in liquid crystals
Abstract:We have experimentally observed the pattern instabilities of an Ising wall formed in a nematic or cholesteric liquid crystal layer. We have deduced an envelope equation, relevant close toExpand
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Rheological studies of cellulose derivatives solutions
The rheological behavior of solutions of cellulose derivatives, acetate, and hydroxypropyl was studied as a function of different parameters; molecular weight, concentration,…, at T = 25°C in theExpand
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Flow Alignment in Smectic Liquid Crystal
The experimental results of Cladis et al. ill about the behaviour of smectic-C liquid crystal free-standing films subjected to a two-dimensional shear flow are reproduced via a Ginzburg-Landau modelExpand
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“Magic Spiral” Submitted to a Torque: Topological Flows Driven by Ericksen Stresses in Sm C Films
Abstract We will show here that, in a two-dimensional liquid crystal system where disclinations are present, the elastic torque cannot balance alone an external torque; a hydrodynamic flow mustExpand
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New Aspect of the Voltage/Confinement Ratio Phase Diagram for a Confined Homeotropic Cholesteric
We have investigated the behavior of a cholesteric mixture, consisting of the negative dielectric anisotropy liquid crystal MBBA and a chiral dopant S811(1%b.w.). In the phase diagram a.c. appliedExpand
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