Formation of m- and p-xylenes during dehydrocyclization of n-octane on chromium oxide catalysts

Conclusions In the dehydrocyclization of n-octane the m- and p-xylenes are formed as a result of the isomerization of the carbon skeleton of the aliphatic intermediate products of the reaction, namely the octadienes and octatrienes.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1675–1676, July, 1973.     

Dynamics of colloid silver nanoparticles in an evaporating water drop

The method of photon correlation spectroscopy is used to investigate the distribution of the diffusion coefficient of silver nanoparticles in an evaporating water drop given that the drop base area remains unchanged (the pinning condition). It is established that the capillary flow dominates over the diffusion nanoparticle motion in redistribution of concentration of the dissolved nanoparticles.     

Limiting cycles of a second-order nonlinear recursive digital system with truncation in modulus after summation

We analyze free oscillations in a digital second-order system with saturation nonlinearity and truncation in modulus after summation. The limiting cycles are found to exist in the system. Analytical and experimental estimates for their periods and existence conditions are given. Yaroslavl’ State University, Yaroslavl’, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 43, No. 2, pp. 174–181, February 2000.     

Oscillations in autonomous two-dimensional second-order recursive digital systems with symmetric coefficients and binary quantization

We study the processes in autonomous two-dimensional second-order recursive digital systems with symmetric coefficients and two-level quantization of summarizing results. A method for bifurcation diagram construction within the framework of the deterministic approach is proposed. Using this method, the conditions for existence of given types of output signals expressed through filter coefficients are found. A bifurcation diagram of the system is constructed. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 49, No. 7, pp. 635–642, July 2006.     

Dynamics of a Second-Order Digital Recursive System with Binary Quantization

We analyze free oscillations and dynamical regimes of a second-order recursive system under constant or periodic binary forcing. Based on the technique developed in this paper, we find the parameter regions corresponding to certain forms and periods of motion in the system and analytical expressions for motion trajectories. The bifurcation diagrams are plotted.