A simple theoretical model is developed which describes how current eddies are excited in the scrape-off layer SOL of a large-aspect-ratio, low, circular cross-section tokamak by time-varying magnetohydrodynamical instabilities originating from within the plasma. This model is used to study the interaction of SOL currents with tearing modes and resistive wall modes in a typical tokamak plasma. ...

The nonlinear dynamics of magnetic tearing islands imbedded in a pressure gradient driven turbulence is investigated numerically in a reduced magnetohydrodynamic model. The study reveals regimes where the linear and nonlinear phases of the tearing instability are controlled by the properties of the pressure gradient. In these regimes, the interplay between the pressure and the magnetic flux det...

The recent achievement in the simulation study of multi-scale interaction among MHD, turbulence and transport is reported. Firstly, we discuss the formation and collapse of Internal Transport Barrier (ITB) in Tokamaks. The meso-scale structures are generated by three-wave interaction among drift wave turbulence. These structures interact each other, which generate the global mode around barrier...

BACKGROUND Rotator cuff tearing has been found to be clinically associated with other tendinopathies and compression neuropathies; a significant excess of these phenotypes has been seen in patients with rotator cuff tears. It is unclear if the association is secondary to environmental or genetic influences. PURPOSE To examine population-based data for comorbid association of rotator cuff tear...

In the process of continuous casting, the melted steel from the melting pot is passed, through the intermediary of the distributor, in the water-cooled crystallizer tank. In this way, a crust forms here which is solidified at the exterior, and one of the great problems is its cracking or even its tearing, due to several factors. This phenomenon determines the stopping of the technologic process...

It is demonstrated that a magnetic island chain formed by a saturated tearing instability in a toroidal magnetic fusion device can lock to a special class of externally generated magnetic perturbation in a stabilizing phase. The theoretical apparatus needed to design such perturbations is outlined. These special perturbations—which are termed ‘‘designer’’ error fields—could be used to control t...

Magnetic activity phenomena are characteristic for T-Tauri stars as well as protostellar class I objects. A model for the flare-like emissivity based on a macroscopic plasma instability, the resistive tearing mode, is proposed. The dispersion relation for the unstable modes for the appropriate partially ionized dusty plasma regime is presented and solved numerically. The results indicate that t...

One of the opportunities created by the ever-continuing increase in computing power is the possibility to model physical systems accurately and in detail. Mathematical models are the basis for simulation and of model-based analysis and design. Complex interconnected systems are usually modeled by tearing, zooming, and linking. Tearing refers to viewing a system as an interconnection of sub-syst...

The Boundary Element Tearing and Interconnecting (BETI) methods have recently been introduced as boundary element counterparts of the well–established Finite Element Tearing and Interconnecting (FETI) methods. In this paper we present inexact data–sparse versions of the BETI methods which avoid the elimination of the primal unknowns and dense matrices. However, instead of symmetric and positive...

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