1,915 research outputs found
Symmetric subgroups in modular group algebras
No full textThis preprint is translated from the original journal publication in Russian: A. Konovalov and A. Tsapok, Symmetric subgroups of the normalised unit group of the modular group algebra of a finite p-group, Nauk. Visn. Uzhgorod. Univ., Ser. Mat., 9 (2004), 20–24.Let V(KG) be a normalised unit group of the modular group algebra of a finite p-group G over the field K of p elements. We introduce a notion of symmetric subgroups in V(KG) as subgroups invariant under the action of the classical involution of the group algebra KG. We study properties of symmetric subgroups and construct a counterexample to the conjecture by V.Bovdi, which states that V(KG)=, where S* is a set of symmetric units of V(KG).Peer reviewe
Development of mathematical models and methods of task distribution in distributed computing system
No full textThe article deals with certain aspects of Grid and Grid modeling. Grid is a distributed softwarehardware environment based on new computation and job flow management structure, principally. For analyzing the problems related to the logics of user-resource interaction, there has been developed a general model scheme. Within that scheme the authors consider the models that allow the formulation of concrete mathematical tasks. The ways of solving the assigned tasks are discussed as well
Layering and relaxation in molecular films of a photosensitive polyacrylate from X-ray reflectivity and inelastic neutron scattering experiments
No full textCreative activity of military engineer Nikolai Konovalov in the Far East
No full textThe article presents the interim results of a study conducted within the framework of the scientific project “Architects and engineers of the eastern outskirts of Russia (second half of the 19th – early 20th centuries)”. On the basis of archival data and materials of field surveys, the author presents a complete picture of the creative and professional activity in the Far East of a military engineer, a graduate of the St. Petersburg Nikolaev Engineering Academy Nikolai Vasilyevich Konovalov. Brief biographical information is given, projects and surviving buildings in Port Arthur and Vladivostok are considered
Integral group ring of the McLaughlin simple group
No full textWe consider the Zassenhaus conjecture for the normalized unit group of the integral group ring of the McLaughlin sporadic group McL. As a consequence, we confirm for this group the Kimmerle’s conjecture on prime graphs
Doping-induced conductivity transitions in molecular layers of polyaniline: Detailed structural study
No full textWe report detailed structural investigations, by synchrotron X-ray reflectivity (XRR), grazing incidence diffraction (GID), and space-resolved grazing incidence X-ray-induced fluorescence (GIXF), on the structure of molecular layers of polyaniline (PANI) that can be converted from insulating to conducting state simply by doping. We first address the simpler, but more intriguing, system, i.e., a floating monolayer of PANI on different subphases, for which we found a typical thickness of 28(1) angstrom, not much affected by the doping process. For the doped film we also found all internal lateral structure, with in-plane spacing of 3.5 angstrom-albeit with a small coherence of 3-4 repeat units only-compatible with face-to-face interchain stacking of phenyl rings, in agreement with the literature. By GIXF we could confirm the crucial role of Cl(-) intercalation in the doping process of the PANI film: under doping conditions (0.1 M HCl subphase) the Cl(-) intake is 8 times larger than in nondoping conditions (0.1 M KCl subphase). Multilayers transferred onto solid substrate were studied also as a function of the applied voltage, as this system constitutes the core of an electrochemically controlled device whose strongly nonlinear characteristic make it useful for applications to adaptive networks for complex information processing. By the application of all electrostatic field of 140 V/m, Cl ionic migration was observed confined to the polymeric film surface
Molecular relaxation and microscopic structure of multilayers and superlattices of a photosensitive liquid-crystalline polymer
No full textPeculiarities of fuel burning in dry and wet cement production kilns
No full textPeculiarities of fuel burning in dry and wet cement production kilns / V. M. Konovalov [et al.] // IOP Conf. Series: Earth and Environmental Science. - 2018. - Vol. 194. - 052016.The paper presents the findings of fuel efficiency in cement rotary kilns. It demonstrates the relevance of the aggregate of factors which provide obtaining a sustainable hot flame during fuels burning. The paper analyses the impact of alternative fuel and heat recuperation when cooling a cement clinker on the flame exergy as well
Microscopic structure of crystalline Langmuir monolayers of hydroxystearic acids by X ray reflectivity and GID: OH group position and dimensionality effect
No full textA Maximum-Likelihood relatedness estimator allowing for negative relatedness values
No full textPreviously reported maximum-likelihood pairwise relatedness (r) estimator of Thompson and Milligan (M) was extended to allow for negative r estimates under the regression interpretation of r. This was achieved by establishing the equivalency of the likelihoods used in the kinship program and the likelihoods of Thompson. The new maximum-likelihood (ML) estimator was evaluated by Monte Carlo simulations. It was found that the new ML estimator became unbiased significantly faster compared to the original M estimator when the amount of genotype information was increased. The effects of allele frequency estimation errors on the new and existing relatedness estimators were also considered
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