R. Reigada,1 F. Sagués,1 I. M. Sokolov,2,3 J. M. Sancho,4 and A. Blumen2 1Departament de Quı́mica Fı́sica, Universitat de Barcelona, Diagonal 647, Barcelona 08028, Spain 2Theoretische Polymerphysik, Universität Freiburg, Rheinstrasse 12, D-79104 Freiburg i. Br., Germany 3P. N. Lebedev Physical Institute of the Academy of Sciences of Russia, Leninski Prospect 53, Moscow 117924, Russia 4Departament...

We report the design of a structurally concise alanine derivative (Ala-hyd) that has a rotationally flexible aromatic N-protecting group for alanine and a hydrazide functionality at its carboxylic end. Ala-hyd requires mechanical agitation (physically stirring, vortexing or sonicating) to form supramolecular hydrogels at medium concentrations (0.4-0.8 wt%). At higher concentrations (>0.8 wt%), ...

The response to a localized perturbation of an excitable medium under stirring by chaotic advection is investigated. It is found that below a critical stirring rate a localized perturbation produces a coherent global excitation of the system. For very slow stirring, however, the coherence of the global excitation is gradually lost. We propose a simple model to describe the effect of the flow on...

The e ects of stirring on the bulk etch rate of LR 115 detector has been investigated. The surface pro6le measurement method using an instrument called Form Talysurf has been used to measure the thickness of the active layer of the LR 115 detectors. The etchant was 10% aqueous solution of NaOH maintained at 60◦C. The bulk etch rate under magnetic stirring has been found to be 6:65 ± 0:34 m h−1 ...

Transport in laminar flows is governed by chaotic stirring and striation in long thin filaments. In turbulent flows, isotropic mixing dominates and tracers behave like stochastic variables. In this paper, we investigate the quasi-turbulent, intermediate regime where both chaotic stirring and turbulent mixing coexist. In these flows, the most common in nature, aperiodic Lagrangian coherent struc...