Magnetic resonance study of the spin-reorientation transitions in the quasi-one-dimensional antiferromagnet BaCu2Si2O7

A quasi-one dimensional antiferromagnet with a strong reduction of the ordered spin component, BaCu2Si2O7, is studied by the magnetic resonance technique in a wide field and frequency range. Besides of conventional spin-flop transition at the magnetic field parallel to the easy axis of spin ordering, magnetic resonance spectra indicate additional spin-reorientation transitions in all three principal orientations of magnetic field. At these additional transitions the spins rotate in the plane perpendicular to the magnetic field keeping the mutual arrangement of ordered spin components. The observed magnetic resonance spectra and spin-reorientation phase transitions are quantitatively described by a model including the anisotropy of transverse susceptibility with respect to the order parameter orientation. The anisotropy of the transverse susceptibility and the strong reduction of the anisotropy energy due to the quantum spin fluctuations are proposed to be the reason of the spin reorientations which are observed.Comment: RevTeX, 9 pages, 7 figure

Uncertainty of the implementation time of geodynamic monitoring system in multi-criteria ranking of alternatives

The paper deals with the problem of ranking alternatives to geodynamic monitoring systems in the case of uncertainty of their implementation time. The problem is characterized by the fact that the choice of alternatives and the effect of it depends on the quality properties of the applied organizational and technical solutions, taking into account the time of implementation. The ordering of alternatives is proposed taking into account the uncertainty of the implementation time factors. Ranking is realized by comparing the trees of functional characteristics of alternatives taking into account the compliance of their characteristics with time-varying requirement

Androgynous plot in the oeuvre of Z.N. Gippius and its reflection in the novel by V.V. Nabokov "The gift"

This article considers androgynous plot in fictional prose of Z.N. Gippius, exemplified with the short novel “The mirrors” (1896) and the novel “Roman-tzarevitch” (1913), within the frameworks of studying of creative life model of this prominent representative of Russian Silver Age. Androgynous plot as an creative life allusion by Z.N. Gippius created the base for so-called “History if Yasha Chernyshevskiy” , which from hearsay is retold by the main character of V.V. Nabokov’s novel “The Gift” F.K.Godunov-Cherdyntsev. This text vividly expresses author’s polemical attitude to Z.N. Gippius’ creativeyesBelgorod State Universit

Characteristics of anomalously high multiplicity cosmic ray interactions

Six events with the number of secondaries ranging from 250 to several thousands were registered by an installation consisting of a thin graphite target, above and under which are placed photolayers followed by the usual lead X-ray film and emulsion chambers. Data concerning the number of secondaries and their angular distribution are given. The variance of the angular distribution is compared with data obtained at accelerator energies

Institutional formation to develop tourism and recreation clusters

The article analyzes the specific features of the notion “institutional environment” and its impact on the effective functioning of the tourist and recreational clusters in Russia. The main components of the institutional environment influencing the development of the tourist and recreational clusters are considered in the article. The application of the given method allows to propose the authors’ vision of the institutional environment as an economic policy. The authors single out the main economic relations being formed in the institutional environment and providing the effective development of the tourist and recreational clusters as the element of the economic system.peer-reviewe