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K. I. Turta A. O. Solonenco I. I. Bulgak F. K. Jovmir M. Rosenberg P. Stelmaszyk G. Filoti 《Journal of Radioanalytical and Nuclear Chemistry》1995,190(2):347-355
The new Fe(III) complexes with isosceles or equilateral configurations showed atypical magnetic behaviour with a magnetic susceptibility which does not obey the Curie-Weiss law. The experimental data were fitted by using the Heisenberg-Dirac-van Vleck model with a spin Hamiltonian containing different exchange parameters in the case of isosceles configuration. A more elaborate Hamiltonian, taking into account the perturbation arising from a biquadratic exchange interaction was used in the case of equilateral configurations. 相似文献
12.
Siberian Mathematical Journal - 相似文献
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Summary. We consider nonlinear systems of difference equations with and , where A is any matrix, is a continuous vector-function, and is a numeral parameter. The spectrum of A belongs to the unit circle . We give the estimations for the region of attraction and the speed of convergence solutions to the zero solution of the
systems. We indicate a set M such that for solutions of the system with parameter the limit is true.
Received April 7, 2000 / Revised version received January 8, 2001 / Published online November 15, 2001 相似文献