Zonostrophic instability leads to the spontaneous emergence of zonal jets on a b plane from a jetless basicstate flow that is damped by bottom drag and driven by a random body force. Decomposing the barotropic vorticity equation into the zonal mean and eddy equations, and neglecting the eddy–eddy interactions, defines the quasilinear (QL) system. Numerical solution of the QL system shows zonal ...

Continuous combustion processes are prominently encountered in many applications related to power generation, heating and propulsion. Examples include domestic and industrial burners, steam and gas turbines, waste generators, and jet and ramjet engines. Continuous combustion processes exhibit a wide range of dynamics. Of these, conditions which promote coupling with the acoustic field and resul...

The concerns regarding the economic insecurity stemming from earnings instability have been gaining momentum in the contemporary political discourse. If earnings instability is as a proxy for risk, for risk-averse individuals, increasing earnings instability bears substantial welfare costs. Using the variance of transitory earnings estimated using the European Community Household Panel (ECHP) a...

The Kelvin-Helmholtz instability in superfluids is discussed, based on the first experimental observation of such instability at the interface between superfluid He-A and superfluid He-B [1]. We discuss why the Kelvin-Helmholtz criterion, the Landau critical velocity for nucleation of ripplons, and the free energy consideration all give different values for the instability treshold. 1 Classical...

Software instability measures indicate the necessity to modify a software module (class, package, subsystem, etc) due to changes in other related software entities. If there is low instability, then there is evidence the analyzed entity has little dependence on others and the project has a good maintainability. Otherwise, there is evidence that the analyzed entity is sensitive to changes occurr...

We discuss the results of experiments that illustrate some features of a turbulent mixing zone (TMZ) structure at a gas–liquid interface (Rayleigh–Taylor instability) and at a gas–gas interface accelerated by shock waves (Richtmyer–Meshkov instability). The important feature is the existence of a heavier substance concentration (density) jump at the interface between the heavy medium and the TM...

To whet your appetite for the special focus in next issue’s Leading Edge on Genomic Instability, we take a look at what’s new in the field of DNA repair. Ranging from network analyses of the proteins involved in mutagenic DNA repair to examination of single molecules taking part in homologous recombination, this Select probes the inner workings of a process that can wreak havoc during carcinoge...