Fusion Rules in Turbulent Systems with Flux Equilibrium

Turbulent dynamos with advective magnetic helicity flux

Many astrophysical bodies harbour magnetic fields that are thought to be sustained by a dynamo process. However, it has been argued that the production of large-scale magnetic fields by meanfield dynamo action is strongly suppressed at large magnetic Reynolds numbers owing to the conservation of magnetic helicity. This phenomenon is known as catastrophic quenching. Advection of magnetic fields ...

Optimum Fusion Rules for Multimodal Biometric Systems

This chapter discusses a multimodal biometric sensor fusion approach for controlling building access. A Bayesian framework is implemented fusing the decisions received from multiple biometric sensors and achieving the desired system accuracy. The optimal rule is a function of the error cost and a priori probability of an intruder. The chapter presents and then analyzes a Bayesian framework for ...

Fundamental limitations on plasma fusion systems not in thermodynamic equilibrium

Heat equilibrium distribution in a turbulent flow

We consider a shear flow of a scale invariant homogeneous Gaussian random velocity field which does not depend on the coordinates in the direction of the flow. We investigate a heat advection coming from a Gaussian random homogeneous source. We discuss a relaxation at large time of a temperature distribution determined by the forced advectiondiffusion equation. We represent the temperature corr...

Magnetic flux concentrations from turbulent stratified convection

Context. The formation of magnetic flux concentrations within the solar convection zone leading to sunspot formation is unexplained. Aims. We study the self-organization of initially uniform sub-equipartition magnetic fields by highly stratified turbulent convection. Methods. We perform simulations of magnetoconvection in Cartesian domains representing the uppermost 8.5−24 Mm of the solar conve...