460 research outputs found

    Induced defect nucleation and side-band instabilities in hexagons with rotation and mean flow

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    The combined effect of mean flow and rotation on hexagonal patterns is investigated using Ginzburg-Landau equations that include nonlinear gradient terms as well as the nonlocal coupling provided by the mean flow. Long-wave and short-wave side-band instabilities are determined. Due to the nonlinear gradient terms and enhanced by the mean flow, the penta-hepta defects can become unstable to the induced nucleation of dislocations in the defect-free amplitude, which can lead to the proliferation of penta-hepta defects and persistent spatio-temporal chaos. For individual penta-hepta defects the nonlinear gradient terms enhance climbing or gliding motion, depending on whether they break the chiral symmetry or not.Comment: 24 pages, 15 figures, submitted to Physica

    MANAGING POLICY NETWORKS: A SOCIAL MARKETING- AND COLLECTIVE INTELLIGENCE SYSTEMS-DRIVEN VIEW

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    This research contributes a new view of Policy Networks (PN) management. The research object is a successful PN practice in the Basque Country (BC) over an 8-year period, in relation to Local Agenda 21 (LA21) promotion. The Basque experience is studied using a qualitative and a quantitative approach. PNs are viewed as social marketing-driven collective intelligence systems built to have an effect on municipality commitment to LA21 (in terms of value, satisfaction and loyalty). The research concludes that by fostering the co-development ‘genome’ (a mix of co-decision, co-creation, love, glory and money ‘genes’) a commitment to the new tool is achieved.

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