Frictional shear cracks

We discuss crack propagation along the interface between two dissimilar materials. The crack edge separates two states of the interface, ``stick'' and ``slip''. In the slip region we assume that the shear stress is proportional to the sliding velocity, i.e. the linear viscous friction law. In this picture the static friction appears as the Griffith threshold for crack propagation. We calculate the crack velocity as a function of the applied shear stress and find that the main dissipation comes from the macroscopic region and is mainly due to the friction at the interface. The relevance of our results to recent experiments, Baumberger et al, Phys. Rev. Lett. 88, 075509 (2002), is discussed

Philosophico-linguistic background of the problem nothing

A range of sciences and disciplines deal with the problem NOTHING, among them there are philosophy, logics, psychology, linguistics. Each science finds its own background in the existence of the category of nothing, in accordance with the dominating current in the certain academic sphere. At the moment there is a tendency to dedicate researches to the linguistic and philosophical background

Philosophico-linguistic background of the problem nothing

A range of sciences and disciplines deal with the problem NOTHING, among them there are philosophy, logics, psychology, linguistics. Each science finds its own background in the existence of the category of nothing, in accordance with the dominating current in the certain academic sphere. At the moment there is a tendency to dedicate researches to the linguistic and philosophical background

Nonlinear Two-Dimensional Green's Function in Smectics

The problem of the strain of smectics subjected to a force distributed over a line in the basal plane has been solved

High-Field Low-Frequency Spin Dynamics

The theory of exchange symmetry of spin ordered states is extended to the case of high magnetic field. Low frequency spin dynamics equation for quasi-goldstone mode is derived for two cases of collinear and noncollinear antiferromagnets.Comment: 2 page