6,614 research outputs found

    Acoustics of tachyon Fermi gas

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    We consider a Fermi gas of free tachyons as a continuous medium and find whether it satisfies the causality condition. There is no stable tachyon matter with the particle density below critical value nTn_T and the Fermi momentum kF<32mk_F<\sqrt{\frac 32}m that depends on the tachyon mass mm. The pressure PP and energy density EE cannot be arbitrary small, but the situation P>EP>E is not forbidden. Existence of shock waves in tachyon gas is also discussed. At low density nT<n<3.45nTn_T<n<3.45n_T the tachyon matter remains stable but no shock wave do survive.Comment: 14 pages, 2 figures (color

    Regional Investment Policy Under the Impact of Budget Limitations and Economic Sanctions

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    The article is devoted to the assessment of influence of budgetary restrictions and economic sanctions on investment policy of a region. The paper studies the bilateral negative effect on socio-economic development of regions from both the external sanctions and braking mechanism of economic development within the country. On the basis of the comparative and statistical analysis, the need to change focus of investment policy from the growth in volumes to qualitative perfecting is proved. The new direction of investment policy connected with the import substitution process realization, its combination with acceleration of innovative development on the certain example of Sverdlovsk region is analyzed. The conclusions and offers stated in the article are applicable to the public authorities of subjects of the Russian Federation, experts in the sphere of regional investment policy and improvement of investment climate, and also the specialized organizations specialized in attracting investment and work with investors in regions of Russia

    Parametric frequency mixing in the magneto-elastically driven FMR-oscillator

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    We demonstrate the nonlinear frequency conversion of ferromagnetic resonance (FMR) frequency by optically excited elastic waves in a thin metallic film on dielectric substrates. Time-resolved probing of the magnetization directly witnesses magneto-elastically driven second harmonic generation, sum- and difference frequency mixing from two distinct frequencies, as well as parametric downconversion of each individual drive frequency. Starting from the Landau-Lifshitz-Gilbert equations, we derive an analytical equation of an elastically driven nonlinear parametric oscillator and show that frequency mixing is dominated by the parametric modulation of FMR frequency

    International justice as a way to settle conflicts in the world arena : the idea and the implementation

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    The purpose of this article is to identify the processes regarding the emergence of international justice and the start of international courts functioning. Dialectical, phenomenological and historical methods of analysis is the methodological basis of the article to allow to identify the international justice essence and the specifics of this phenomenon implementation in the initial stages of its development. In the course of this analysis the authors came to the conclusion that the international justice concept formation occurred in the turn of the XIXth and XXth centuries while the international justice formation took place in the first half of the XXth century.peer-reviewe

    Interaction between superconducting vortices and Bloch wall in ferrite garnet film

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    Interaction between a Bloch wall in a ferrite-garnet film and a vortex in a superconductor is analyzed in the London approximation. Equilibrium distribution of vortices formed around the Bloch wall is calculated. The results agree quantitatively with magneto-optical experiment where an in-plane magnetized ferrite-garnet film placed on top of NbSe2 superconductor allows observation of individual vortices. In particular, our model can reproduce a counter-intuitive attraction observed between vortices and a Bloch wall having the opposite polarity. It is explained by magnetic charges appearing due to discontinuity of the in-plane magnetization across the wall.Comment: 4 pages, 5 figure

    Integration of economic shifts in the european development in the second half of the XXth century

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    Purpose: The article analyzes those processes having initiated the development of the European and political integration. The article is focused on the genesis and the development of the Council for Mutual Economic Assistance, the European Union, NATO and the Warsaw Pact. Design/Methodology/Approach: By applying the system analysis method as well as dialectical and historical methods, the authors have attempted to reveal the significance of those events resulted in modern international organizations establishment. Findings: Authors have analyzed the XX century trends in integration and highlighted Western Europe as the most productive in the process. Authors have provided the USSR and post-USSR integration overview to reveal the European development patterns. Practical Implications: The research results may be implemented into political and educational courses as well as to be used by official authorities. Originality/Value: The main contribution of this study is the deep integration trends'analysis and the emphasis on the unipolar-bipolar-multipolar world's concept.peer-reviewe
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