Cooperation of Uzbekistan With the USA and Pakistan in Solving Problems in Afghanistan

In this article, Uzbekistan's cooperation with the United States and Pakistan in solving the problems of the neighboring state of Afghanistan will be analyzed on the basis of the latest materials. Previously unannounced data will be provided. The main attention will be paid to the role of cooperation of these three states for Afghanistan

Theory of weakly nonlinear self sustained detonations

We propose a theory of weakly nonlinear multi-dimensional self sustained detonations based on asymptotic analysis of the reactive compressible Navier-Stokes equations. We show that these equations can be reduced to a model consisting of a forced, unsteady, small disturbance, transonic equation and a rate equation for the heat release. In one spatial dimension, the model simplifies to a forced Burgers equation. Through analysis, numerical calculations and comparison with the reactive Euler equations, the model is demonstrated to capture such essential dynamical characteristics of detonations as the steady-state structure, the linear stability spectrum, the period-doubling sequence of bifurcations and chaos in one-dimensional detonations and cellular structures in multi- dimensional detonations