Reactivity of fullerene C60 towards peroxy radicals generated by liquid-phase oxidation of cumene and ethylbenzene with oxygen

The inhibiting action of fullerene C₆₀ on the liquid-phase initiated oxidation of cumene and ethylbenzene was studied. The apparent rate constants of inhibition by fullerene C₆₀ of cumene and ethylbenzene oxidation were determined by measuring the amount of absorbed oxygen: (1.3±0.2)·10³ and (2.0±0.3)·10³ L mol^?1 s^?1, respectively.     

Low-temperature heat capacity of a dipole spin glass

Low-temperature behavior of the heat capacity of a dipole spin glass is studied analytically. Different contributions to the heat capacity are investigated, their comparison is performed, and their relationship with experimental data is analyzed.     

A quantum spherical <Emphasis Type="Italic">p</Emphasis>-spin glass model: Low-temperature behavior

Low-temperature slow dynamics, aging, and temperature and field shifts are studied analytically and numerically for a quantum p-spin (p = 3) glass model interacting with internal quantum environment and external magnetic fields. It is demonstrated that the correlation function and the real part of susceptibility are subject to aging and restoration (rejuvenation) under little changes of temperature and field. The examined effects are briefly analyzed. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 42–48, January, 2007.     

Nonequilibrium dynamic effects (aging,rejuvenation, and memory) in one-dimensional classical spin chains

The nonequilibrium low-temperature dynamics of the one-dimensional classical Ising spin chain in a chaotic field is investigated analytically and numerically. Special attention is given to the effects of rejuvenation and memory. Aging in several time regimes characterized by different properties is established. Astonishing rejuvenation and memory effects for the dynamic susceptibility are first considered by means of studying temperature jumps and cycles. These effects are briefly analyzed. A comparison with other models of disordered systems is made. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 78–88, June, 2008.     

Low-temperature dynamic behavior of a spherical <Emphasis Type="Italic">p</Emphasis>-spin model of glass in an alternating field

Coupled dynamic Schwinger-Dyson equations for autocorrelation and linear-response functions are used for studying nonequilibrium dynamics of a p-spin model of glass. The numerical solution of these equations reveals an interesting dynamic behavior of the system in the external alternating field. The behavior is also shown to depend on the amplitude and frequency of the foregoing field and on the value of coupling between the spins.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 76–83, October, 2004.     

Strong Resonances at High Excitation Energy in $${}^{\mathbf{17}}$$ O $$+$$ Alpha Resonance Scattering

Physics of Atomic Nuclei - The thick target inverse kinematics (TTIK) approach was used to measure excitation functions for the elastic $${}^{17}$$ O ( $$\alpha,\alpha$$ ) scattering at the initial...     

Cycloadducts of fullerene C60 with trolox and tocopherol diazo derivatives: synthesis and antioxidant activity

The antioxidant activity of new cycloadducts, [2H-chromen-2″-yl]carbonylmethano-fullerenes, obtained from fullerene C₆₀ and diazo ketones was quantitatively studied with initiated cumene oxidation as a model reaction.     

Zero-temperature nonequilibrium dynamics of the spherical Scherrington-Kirkpatrick model of a spin glass in an external field

The decay of the nonequilibrium spin-spin autocorrelation function is calculated analytically and numerically based on the Langevin dynamics for the spherical Scherrington-Kirkpatrick model (p = 2) of a spin glass in a constant magnetic field at zero temperature. The behavior of the spin system is analyzed for different amplitudes of the external constant magnetic field and different waiting times. In the mean-field approximation, the critical value of the external magnetic field is found. The occurrence of the spin-glass phase in weak magnetic fields is demonstrated. For stronger fields, the stationary behavior of the correlation function is revealed. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 10–16, April, 2007.