Chaotic buffering and its mathematical models

We propose a general idea of obtaining different chains of coupled oscillators with chaotic buffering. As examples, we consider chains of diffusively coupled generalized cubic Schrödinger equations and nonlinear telegraph equations. We also give examples of systems that have an infinite-dimensional chaotic attractor.     

Diallylacylhydrazines as monomers for polyfunctional water-soluble polymers

Allylation of acetohydrazide afforded the corresponding diallylacylhydrazine, which can be used for syntheses of water-soluble polyfunctional polymers.     

Radical Copolymerization of Methyl Methacrylate and Styrene in the Presence of Metallocenes

The effect of ferrocene and zirconocene dichloride on the rate and constants of copolymerization of methyl methacrylate with styrene was studied. The results obtained suggest that the metallocenes in the elementary steps of the reaction.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 2, 2005, pp. 297–300.Original Russian Text Copyright © 2005 by Yumagulova, Kolesov, Monakov.     

Raman spectra of olivine solid solutions (FexMg1−x )2SiO4 and spin-vibration interaction

Room temperature Raman spectra of synthesized powder (Fe_xMg_1?x )₂SiO₄ solid solutions are obtained. Frequency trend of all modes versus composition shows clearly the existence of a step at x = 0.3. A step-like behavior of vibration frequencies at the given composition that coincides with the percolation threshold for the olivine lattice is related to the appearance of magnetic excitations in the disordered magnetic medium owing to the spin-vibration interaction.     

Chlorine derivatives of octaorganylsilasesquioxanes

The chlorination of saturated and unsaturated octaorganylsilasesquioxanes proceeds through two pathways, leading to the formation of volatile and nonvolatile products, whose ratio depends on the reaction conditions. The volatile products of the chlorination of R-T₈ (R=C₂H₅ and CH=CH₂) are compounds with the general formula Cl_nR_8–n[SiO_1.5]₈, (n=1–7), obtained independently of the nature of the organic substituent and chlorinating agent. The nonvolatile chlorination products are silasesquioxanes, containing chlorine and chloroalkyl substituents on the atoms of the silicon-oxgyen core. Analysis of the vibrational spectral data indicated that the most significant changes in the molecular vibrational system are made by the halogenation of the silicon-oxygen core Si₈O₁₂.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 446–450, February, 1990.     

Influence of Dibenzyl-o-carborane on Radiation Aging of Polymethyl Methacrylate

Radiation aging of polymethyl methacrylate produced in the presence of dibenzyl-o-carborane was studied. The influence of dibenzyl-o-carborane addition on the thermomechanical properties of the resulting polymer was analyzed.     

Electronic structure of the 3,3′-bis-[η5-π-1,2-dicarba-3-nickel(III)-closododecaborate](1-) anion, {NiIII[η5-π-(3)-1,2-B,C2H11]2}, in salts with different cations,in salts with different cations

The results of the spectral and magnetochemical studies of some salts of the “sandwich-like” paramagnetic anion {Ni^III[η⁵-π-(3)-1,2-B⁹C₂H₁₁]₂}^– (I) with the Cs⁺, (CH₃)₄N⁺, and (C₆H₅)₄P⁺ cations and the cation complex of Fe(II) and 1,10-phenanthroline, [Fe^IIPhen₃]²⁺, are reported. The solid-phase IR, Raman, and X-ray photoelectron spectroscopy methods and optical spectroscopy of solutions were used. The effective magnetic moments (μ_eff) of Ni(III) in anion (I) were measured by the Faraday technique and corrected for the diamagnetism of the aromatic cluster ligands 1,2-B₉C₂H ₁₁ ²⁻ (II). It is established that μ_eff is weakly dependent on the nature of the cation. The problems concerned with the nature of the metal-ligand bonds in metal-carborane systems like (I) are discussed. The hypothesis of the charge transfer from ligands (II) to the transition metal atoms is validated, the donor ability rows of the π-ligands are introduced, and the cluster structure of the systems under study is attested. Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 37, No. 6, pp. 1060–1071, November–December, 1996. Translated by I. Izvekova     

Copolymerization of N,N-diallyl-N′-benzoylhydrazine with acrylonitrile and sulfur dioxide

Radical copolymerization of N,N-diallyl-N′-benzoylhydrazine with acrylonitrile and sulfur dioxide was studied. The kinetic features of the copolymerization of these systems were examined, the relative activities of the monomers were determined, and the structure of the resulting copolymers was elucidated.     

Charged Particle Trajectories in the MAVR High-Resolution Magnetic Spectrometer

Charged-particle trajectories in the MAVR high-resolution magnetic spectrometer [1] are simulated. The latter has been constructed at the U400 accelerator for purifying the incident beam and identifying the products of nuclear reactions induced by the beams of stable and radioactive nuclei. In this paper we present the MAVRPC software package, aimed at reconstructing the spectrometer focal plane, optimizing the fields of quadrupole and dipole magnets, and estimating the solid-angle acceptance for secondary particles.