An ensemble of idealized experiments with the simplified general circulation model PUMA is used to analyze response reduced surface friction, that a strengthening eddy-driven jet, weakening Eulerian mean overturning, and suppression baroclinic instability. The instability caused by an effect called barotropic governor which increased horizontal shear restricts ability disturbances convert avail...

We consider output feedback adaptive stabilization for second-order systems in the presence of bounded exogenous disturbances. This case is of particular interest as it has been shown that, in the presence of exogenous disturbances, direct adaptive control schemes for minimum phase plants with relative degree 1 exhibit parameter divergence eventually leading to instability. We present controlle...

Abstract. Two entropic dynamical models are considered. The geometric structure of the statistical manifolds underlying these models is studied. It is found that in both cases, the resulting metric manifolds are negatively curved. Moreover, the geodesics on each manifold are described by hyperbolic trajectories. A detailed analysis based on the Jacobi equation for geodesic spread is used to sho...

A recently much debated issue is why observed investment and growth rates in poor countries are lower than traditional theory predicts. Empirical evidence suggests that social and political instability is a major reason for the divergence between poor and rich countries. However, there is still the unsolved puzzle that the relationship between development and investment rates is not monotonic b...

Mendenhall Glacier is a lake-calving glacier in southeastern Alaska, USA, that is experiencing substantial thinning and increasingly rapid recession. Long-term mass wastage linked to climatic trends is responsible for thinning of the lower glacier and leaving the terminus vulnerable to buoyancy-driven calving and accelerated retreat. Bedrock topography has played a major role in stabilizing the...

The visual cue of optical flow plays a major role in the navigation of flying insects, and is increasingly studied for use by small flying robots as well. A major problem is that successful optical flow control seems to require distance estimates, while optical flow is known to provide only the ratio of velocity to distance. In this article, a novel, stability-based strategy is proposed to esti...

In the presence of a strong m = 2 component in a rotating galaxy, the phase space structure near corotation is shaped to a large extent by the invariant manifolds of the short period family of unstable periodic orbits terminating at L1 or L2. The main effect of these manifolds is to create robust phase correlations among a number of chaotic orbits large enough to support a spiral density wave o...

This essay develops a stochastic model of electoral competition in order to study the economic and political determinants of trade policy. Ideal policies of the different socioeconomic groups in society (landlords, industrialists, labor and skilled workers) are explicitly derived from a small open economy model. Then those ideal policies (trade policy and local public goods) are used to model t...

In classifying samples by Gaussian clas-siier, the covariance matrix estimated with a small number sample set becomes unstable, which leads to degrading the classiication accuracy. In this paper , we discuss the covariance matrix estimation problem for small number samples with high dimension setting based on Kullback-Leibler Information Measure. A new covariance matrix estimator is developed, ...

This paper is devoted to the numerical simulation of variable density incompressible flows, modeled by the Navier-Stokes system. We introduce an hybrid scheme which combines a Finite Volume approach for treating the mass conservation equation and a Finite Element method to deal with the momentum equation and the divergence free constraint. The breakthrough relies on the definition of a suitable...