This paper describes recent exceptional slope failures in high-mountain, glacial environments: The 2002 Kolka-Karmadon rock-ice avalanche in the Caucasus, a series of ice-rock avalanches on Iliamna Volcano, Alaska, the 2005 Mt. Steller rock-ice avalanche in Alaska, and ice and rock avalanches at Monte Rosa, Italy in 2005 and 2007. Deposit volumes range from 10 to 10 m and include rock, ice and ...

in the present paper the linear oscillator in r3 with z =constanthas been considered. the aim is to determine the necessary conditions forthe persistence of periodic solutions under discontinuous perturbations. a newapproach based on a computational method has been used. at the end weapply our method on an example.

The surface acoustic wave (SAW) generated by the so-called piezoelectric effect was confined to substrate at a depth of one or two wavelengths; hence, it very sensitive towards external perturbations [...]

We show that for almost all perturbations in a one-parameter family of KAM Hamiltonians on smooth compact surface, Lagrangian tori $\Lambda_\omega$, we can find semiclassical measure with positive mass $\Lambda_\omega$.

Helioseismology is the study of solar interior using observations oscillations at surface. It suffers from systematic errors, such as a center-to-limb error in travel-time measurements. Understanding these errors requires good understanding nontrivial relationship between wave displacement and helioseismic observables. The causes perturbations atmospheric thermodynamical quantities which pertur...

in this paper we get some results and applications for duals and approximate duals of g-frames in hilbert spaces. in particular, we consider the stability of duals and approximate duals under bounded operators and we study duals and approximate duals of g-frames in the direct sum of hilbert spaces. we also obtain some results for perturbations of approximate duals.

"Feedout" means the transfer of mass perturbations from the rear to the front surface of a driven target. When a planar shock wave breaks out at a rippled rear surface of the target, a lateral pressure gradient drives sonic waves in a rippled rarefaction wave propagating back to the front surface. This process redistributes mass in the volume of the target, forming the feedout-generated seed fo...

We propose a phenomenological technique for modelling the emergence of active regions within a three-dimensional, kinematic dynamo framework. By imposing localized velocity perturbations, we create emergent flux tubes out of toroidal magnetic field at the base of the convection zone, leading to the eruption of active regions at the solar surface. The velocity perturbations are calibrated to rep...

The relations among the relative changes of surface density, temperature, disk height, and vertically integrated pressure in three kinds of thermally unstable accretion disks are quantitatively investigated, assuming local perturbations. The surface density change is found to be very small in the long perturbation wavelength case but cannot be ignored in the short-wavelength case. It becomes si...