Approximating the maximum ergodic average via periodic orbits

Let sigma: Sigma(A) -> Sigma(A) be a subshift of finite type, let M-sigma be the set of all sigma-invariant Borel probability measures on Sigma(A), and let f : Sigma(A) -> R be a Holder continuous observable. There exists at least one or-invariant measure A which maximizes integral f d mu. The following question was asked by B. R. Hunt, E. Ott and G. Yuan: how quickly can the maximum of the integrals integral f d mu be approximated by averages along periodic orbits of period less than p? We give an example of a Holder observable f for which this rate of approximation is slower than stretched-exponential in p

The influence of geomagnetic activity on polar cap absorption

Cosmic noise absorption data on polar cap analyzed for geomagnetic activit

Biao, X., Yeoh, B.S.A., Toyota, M. (Eds.) Return: Nationalizing Transnational Mobility in Asia. Durham: Duke University Press, 2013.

Book review

The expressive movements of the bonnet macaque

A bonnet troop inhabiting Lal Bagh, Bangalore (Hafeezur Rahaman & Parthasarathy, 1967) was exclusively studied for its communicative behavior. The whole system of the bonnet organization is based on composite expressions. Depending on situations, individual signals or a complex of them involving tactile, visual, auditory, and olfactory are passed from one individual to the other. Among tactile signals the most important one is the grooming; among visual the body movement, more particularly the face and jaws; among auditory the groaning and shrieking; among olfactory the sniffing. Analysis of such a study reveals that the bonnet monkeys have a communicative system and an organization of their own, which though principally are the same as in other primates, do entail a few minor differences. These features though primitive from the standards of human consideration, are developed to their full advantage, but still remain at a primitive level. By far, the greatest part of the whole system of communication seems to be devoted to the organization, of the social behavior of the group, to dominance and subordination, the maintenance of peace and cohesion of the group, reproduction and care of the young (Marler, 1965)

Transforming Urban Governance to Manage Uncertainty and Climate Change in Mumbai, India

Despite unprecedented wealth accumulation, coastal Mumbai suffers from a myriad of socioeconomic and ecological challenges as well as connected uncertainties. These include endemic flooding, shrinking of sensitive ecosystems, inequality, and marginalisation of natural resource-dependent communities, such as fishers. These are in addition to existing risks, including building collapse, fire hazards, infrastructure collapse, industrial accidents, and landslides. The spectre of climate change looms large and further complicates the situation. Urban governance mechanisms and strategies respond insufficiently to the growing threats the city faces. More needs to be done to manage and address these uncertainties through a strategic, adaptation-focused, and communicative urban governance framework that emphasises both reducing risk and strengthening social justice.Research Council of Norwa