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Group Actions (group + action)

Distribution by Scientific Domains

Business, Economics, Finance and Accounting	40%

Selected Abstracts

Conservation of gullies in susceptible riparian areas of alluvial soil regions

LAND DEGRADATION AND DEVELOPMENT, Issue 3 2002
R. C. Yadav
Abstract The problem of gully erosion is very severe in the riparian areas of the alluvial deep soil region in India. Research and development have progressed in response to the change in social needs. The earlier strategy of maintenance of law and order has changed to one of reclamation and restoration of the productive capacity of riparian areas. Watershed management in the ravines has been adopted for development of food security, eco-restoration and pollution control. Case studies on the watershed management in watersheds projects initiated in the mid-1980s revealed the scope for bringing increased prosperity through crop diversification and eco-restoration. In consideration of the erosion process, new concepts of management zones and improved conservation and reclamation practices have been developed. The sociological factors have been rationally analysed, as they applied to watershed management in the ravines. A new paradigm of watershed management by group action is necessary in the future. Since the ways of combating the ravine problem and enhancing the productivity of ravine-degraded lands were made on rational process-based approach, there is scope for it to be implemented in other countries with similar land and socio-economic situations. Copyright © 2002 John Wiley & Sons, Ltd. [source]

HUMAN NATURE, COMMUNICATION AND TRUST

ANNALS OF PUBLIC AND COOPERATIVE ECONOMICS, Issue 1 2009
Louis Putterman
ABSTRACT,:,The facts that people can sometimes commit to fulfill promises even when there are no binding penalties and that kind and trusting acts are often reciprocated by trustworthy ones make possible forms of group action that might be ruled out in a hypothetical world of perfectly opportunistic individuals. I discuss some new experiments with a modified Berg,Dickhaut and McCabe (1995),trust game' that provide evidence that most subjects adhere to non-binding agreements, that many are prepared to rely on trust rather than use binding but moderately costly contracts, that the possibility of exchanging words rather than mere numerical proposals enhances trusting and trustworthiness, and that subjects are drawn to fair and efficient exchanges despite the self-interest model's prediction of outcomes more favorable to first-movers. [source]

Polish group actions, nice topologies, and admissible sets

MLQ- MATHEMATICAL LOGIC QUARTERLY, Issue 6 2008
Barbara Majcher-Iwanow
Abstract Let G be a closed subgroup of S, and X be a Polish G -space. To every x , X we associate an admissible set Ax and show how questions about X which involve Baire category can be formalized in Ax. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Symmetry and bifurcation in vestibular system

PROCEEDINGS IN APPLIED MATHEMATICS & MECHANICS, Issue 1 2007
Marty Golubitsky
The vestibular system in almost all vertebrates, humans included, controls balance by employing a set of six semicircular canals, three in each inner ear, to detect angular accelerations of the head. Signals from the canals are transmitted to neck motoneurons and activate eight corresponding muscle groups. These signals may be either excitatory or inhibitory, depending on the direction of acceleration. McCollum and Boyle have observed that in the cat the network of neurons concerned possesses octahedral symmetry, a structure deduced from the known innervation patterns (connections) from canals to muscles. We re-derive the octahedral symmetry from mathematical features of the probable network architecture, and model the movement of the head in response to the activation patterns of the muscles concerned. We assume that connections among neck muscles can be modeled by a ,coupled cell network', a system of coupled ODEs whose variables correspond to the eight muscles, and that network also has octahedral symmetry. The network and its symmetries imply that these ODEs must be equivariant under a suitable action of the octahedral group. Using results of Ashwin and Podvigina, we show that with the appropriate group actions, there are six possible spatiotemporal patterns of time-periodic states that can arise by Hopf bifurcation from an equilibrium corresponding to natural head motions. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Brand community: Drivers and outcomes,

PSYCHOLOGY & MARKETING, Issue 4 2010
Nicola Stokburger-Sauer
Groups of users and admirers of a brand who engage jointly in group actions to accomplish collective goals and/or to express mutual sentiments and commitments are known as brand communities. Lately, brand communities have been a heavily researched topic in marketing science. While the positive consequences of brand communities are well documented in the literature, little is known about how brand communities can be facilitated and how consumer,brand relationships can be fostered. This research empirically assesses the relevance of offline (i.e., events) and online marketing management tools (i.e., Web sites with online bulletin boards and online expert chats) to strengthen brand communities by facilitating shared customer experiences and multi-way interactions. Additionally, the importance of consumer,brand identification as a consequence of such relationship-building activities is investigated, and the outcomes of a consumer's identification with a brand are analyzed. Important management implications can be derived. © 2010 Wiley Periodicals, Inc. [source]