9 research outputs found

    Current status of turbulent dynamo theory: From large-scale to small-scale dynamos

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    Several recent advances in turbulent dynamo theory are reviewed. High resolution simulations of small-scale and large-scale dynamo action in periodic domains are compared with each other and contrasted with similar results at low magnetic Prandtl numbers. It is argued that all the different cases show similarities at intermediate length scales. On the other hand, in the presence of helicity of the turbulence, power develops on large scales, which is not present in non-helical small-scale turbulent dynamos. At small length scales, differences occur in connection with the dissipation cutoff scales associated with the respective value of the magnetic Prandtl number. These differences are found to be independent of whether or not there is large-scale dynamo action. However, large-scale dynamos in homogeneous systems are shown to suffer from resistive slow-down even at intermediate length scales. The results from simulations are connected to mean field theory and its applications. Recent work on helicity fluxes to alleviate large-scale dynamo quenching, shear dynamos, nonlocal effects and magnetic structures from strong density stratification are highlighted. Several insights which arise from analytic considerations of small-scale dynamos are discussed.Comment: 36 pages, 11 figures, Spa. Sci. Rev., submitted to the special issue "Magnetism in the Universe" (ed. A. Balogh

    НАЛОГООБЛОЖЕНИЕ И НАЛОГОВАЯ ОТЧЕТНОСТЬ В ТУРКМЕНИСТАНЕ: РЕФОРМЫ ЭПОХИ НЕЗАВИСИМОСТИ

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    In the beginning of 90's new independent countries of CIS have begun the development of their government systems, including the tax system and standards of tax return. Turkmenistan is one of the interesting examples of such development because of its attractiveness for foreign investor, abundancy of natural resource and unique path of development. In this article the author will analyze the peculiarities of Turkmen tax system and tax return standards, the reforms of the age of independence and their resultsВ начале 90-х новые независимые страны СНГ начали развитие своих государственных систем, включая систему налогообложения и стандарты налоговой отчетности. Туркменистан является одним из интересных примеров развития, благодаря своей привлекательности для иностранных инвесторов, обилию природных ресурсов и нестандартному пути развития. В данной статье автор проанализирует особенности системы налогообложения и налоговой отчётности в Туркменистане, реформах системы за период независимости и их результат

    Plasma Diagnostics of the Interstellar Medium with Radio Astronomy

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    Contains fulltext : 119335.pdf (preprint version ) (Open Access

    Magnetic Helicity and Large Scale Magnetic Fields: A Primer

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    Current status of turbulent dynamo theory -- From . . .

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