Numerical solution of the two-dimensional nonstationary problem of the motion of a shell under the action of detonation products

The problem of the motion of an incompressible cylindrical shell with an explosive charge is solved numerically for the propagation of a plane detonation wave from the end of the charge. The strength of the shell is not taken into account. A three-term equation of state [1] is assumed for the detonation products. A comparison is made with the one-dimensional case.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 4, pp. 76–79, July–August, 1972.The authors thank G. S. Roslyakov and V. M. Paskonov for assistance in the work and for helpful advice.     

Approximation of Inverse Models for Temperature-Concentration Dependences of the Transmission Function of a Single-Component Homogeneous Gas Medium by Artificial Neural Networks

Russian Physics Journal - The problem of application of artificial neural networks for approximation of inverse models of temperature-concentration dependences of the transmission function of a...     

Motion of the detonation products of a point-ignited charge in a cylindrical shell

A numerical solution is obtained for the two-dimensional nonsteady problem of the motion of detonation products from a cylindrical high-explosive charge enclosed in a shell with the initiation of detonation at a central point in the end of the charge. The detonation products propagate in vacuum. The strength of the shell is not considered. A three-term equation of state is used for the detonation products.     

Thermal decomposition of 1-alkyl-3-methylpyridinium based ionic liquids

Products of thermodegradation of 1-alkyl-3-methylpyridinium halides are investigated by the method of gas chromatomass spectrometry. The main products of the reaction are 3-methylpyridine and the corresponding alkyl halide. It was supposed that thermodecomposition of pyridinium ionic liquids proceeds similar to that of imidazolium ionic liquids by dealkylation with elimination of the substituent at the nitrogen atom of the pyridinium ring via S_N2 mechanism. The presence of 5 wt % of cellulose decreases the onset temperature of thermodecomposition by 15–20°С.     

Analysis of Hydrogen Bonding Network in the Systems Containing Chloride-Based Ionic Liquids with Cellulose/Cellobiose by Fourier-Transform Infrared Spectroscopy

Hydrogen bonds formed upon dissolution of cellulose and cellobiose in ionic liquids, 1-butyl-3- methylpyridinium and 1-butyl-3-methylimidazolium chlorides, have been analyzed and characterized by means of Fourier-transform infrared spectroscopy and quantum-chemical calculation. The obtained data have been used for assignment of absorption bands of individual OH groups and determination of hydrogen bonds energy in the solutions.     

Numerical calculation of the magnetic cumulation process

A numerical calculation is made of the process in the MK-1 magnetocumulative generator under the assumption that the magnetic flux is constant and the tube contraction process is one-dimensional. The instantaneous detonation scheme is adopted. The effect of initial magnetic field intensity and relative size of the cavity on the magnitude of the maximal magnetic field intensity obtained inside the tube is studied.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, Vol. 11, No. 3, pp. 51–55, May–June, 1970.The authors wish to thank L. A. Chudov for his continued interest in the study and valuable advice, and also Yu. V. Korovin for assistance in the calculations.