Aleksey Alekseev

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Under assumption of singular behavior of αs(q 2) at q 2 ≃ 0 and of large q 2 behavior, corresponding to the perturbation theory up to four loops, a procedure is considered of matching the β-function at a boundary of perturbative and non-perturbative regions. The contribution of the non-perturbative region to the gluon condensate is calculated with varying(More)
It is shown, that the possibility of a freezing of QCD running coupling constant at zero in the approach with " forced analyticity " can not be in accord with Schwinger-Dyson equation for gluon propagator. We propose to add to the analytic expression the well-known infrared singular term 1/q 2 as well as pole term corresponding to " excited gluon ". With(More)
In this paper we consider a method for extraction of sets of semantically similar language expressions representing different participants of the text story – thematic chains. The method is based on the structural organization of news clusters and exploits comparison of various contexts of words. The word contexts are used as a basis for extracting(More)
In this paper we consider a method for extraction of sets of semantically similar language expressions representing different participants of the text story – thematic nodes. The method is based on the structural organization of news clusters and exploits comparison of various contexts of words. The word contexts are used as a basis for multiword expression(More)
In this paper we consider a method for extraction of alternative names of a concept or a named entity mentioned in a news cluster. The method is based on the structural organization of news clusters and exploits comparison of various contexts of words. The word contexts are used as basis for multiword expression extraction and main entity detection. At the(More)
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