2,402 research outputs found
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
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