49 research outputs found
Sociocultural aspect of realization of civil control in modern Russian society
The backwardness of civil control in modern Russia is connected with a complex of the reasons of sociocultural character, including with specifics of the Russian traditions of public participation. It is proved that only collective forms of civil control relying on mobilization and use of the social capital of local communities can be the most effective in Russi
"Doubled" generalized Landau-Lifshiz hierarchies and special quasigraded Lie algebras
Using special quasigraded Lie algebras we obtain new hierarchies of
integrable nonlinear vector equations admitting zero-curvature representations.
Among them the most interesting is extension of the generalized Landau-Lifshitz
hierarchy which we call "doubled" generalized Landau-Lifshiz hierarchy. This
hierarchy can be also interpreted as an anisotropic vector generalization of
"modified" Sine-Gordon hierarchy or as a very special vector generalization of
so(3) anisotropic chiral field hierarchy.Comment: 16 pages, no figures, submitted to Journal of Physics
Conservation laws of semidiscrete canonical Hamiltonian equations
There are many evolution partial differential equations which can be cast
into Hamiltonian form. Conservation laws of these equations are related to
one-parameter Hamiltonian symmetries admitted by the PDEs. The same result
holds for semidiscrete Hamiltonian equations. In this paper we consider
semidiscrete canonical Hamiltonian equations. Using symmetries, we find
conservation laws for the semidiscretized nonlinear wave equation and
Schrodinger equation.Comment: 19 pages, 2 table
Kinetics of exciton photoluminescence in type-II semiconductor superlattices
The exciton decay rate at a rough interface in type-II semiconductor
superlattices is investigated. It is shown that the possibility of
recombination of indirect excitons at a plane interface essentially affects
kinetics of the exciton photoluminescence at a rough interface. This happens
because of strong correlation between the exciton recombination at the plane
interface and at the roughness. Expressions that relate the parameters of the
luminescence kinetics with statistical characteristics of the rough interface
are obtained. The mean height and length of roughnesses in GaAs/AlAs
superlattices are estimated from the experimental data.Comment: 3 PostScript figure
Structure of Core-Shell Ni/Au Nanoparticles Synthesized in Two-Stage Process From Aqueous Salt Solutions
Core-shell Ni/Au nanoparticles are synthesized in a two-stage process in aqueous solutions. The core-shell structure of the synthesized particles is proven by using results of HRTEM, TEM, SAXS and CVA methods. The thickness of the core is estimated at 1 nm and it is formed from 1–2 layers of mutually oriented gold crystallites. The CVA results show that the Au-shells are nanoporous, and that a layer of nickel oxidation products is formed. These results were obtained by using Vis spectrophotometer, TEM, HRTEM, SAXS, CVA and elemental analysis
Globular Clusters as Candidates for Gravitational Lenses to Explain Quasar-Galaxy Associations
We argue that globular clusters (GCs) are good candidates for gravitational
lenses in explaining quasar-galaxy associations. The catalog of associations
(Bukhmastova 2001) compiled from the LEDA catalog of galaxies (Paturel 1997)
and from the catalog of quasars (Veron-Cetty and Veron 1998) is used. Based on
the new catalog containing 8382 pairs, we show that one might expect an
increased number of GCs around irregular galaxies of types 9 and 10 from the
hypothesis that distant compact sources are gravitationally lensed by GCs in
the halos of foreground galaxies. The King model is used to determine the
central surface densities of 135 GCs in the Milky Way. The distribution of GCs
in central surface density was found to be lognormal.Comment: 22 pages, 4 figure
Extended parametric resonances in nonlinear Schrodinger systems
We study an example of exact parametric resonance in a extended system ruled
by nonlinear partial differential equations of nonlinear Schr\"odinger type. It
is also conjectured how related models not exactly solvable should behave in
the same way. The results have applicability in recent experiments in
Bose-Einstein condensation and to classical problems in Nonlinear Optics.Comment: 1 figur
Bose--Einstein solitons in highly asymmetric traps
We obtain analytic solutions to the Gross-Pitaevskii equation with negative
scattering length in highly asymmetric traps. We find that in these traps the
Bose--Einstein condensates behave like quasiparticles and do not expand when
the trapping in one direction is eliminated. The results can be applicable to
the control of the motion of Bose--Einstein condensates.Comment: 12 pages, Latex, Figures available under request on
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Oral squamous cell carcinoma in "young" patients
Aim of the study — to provide for medical oncologists and surgeon, who specialize in treatment of head and neck oncology patients, the most recent information about incidence and feature of oral squamous cell carcinoma (OSCC) in young patientsЦель исследования — предоставить онкологам и хирургам, специализирующимся на лечении пациентов, страдающих раком головы и шеи, наиболее полную информацию о распространенности и особенностях плоскоклеточного рака полости рта у «молодых» пациентов на основе последних литературных данны
Исследование острой токсичности ГИЖ-290 на мышах
Acute toxicity testing is a commonly accepted procedure for preclinical testing of the safety of potential drugs. The compound GIZh-290, which is a derivative of 4-phenylpyrrolidone– 2,6 - dimethylanilide (2-oxo-4-phenylpyrrolidine-1-yl) acetic acid and has a nootropic and anticonvulsant effect, was studied. The results obtained after a single oral and intraperitoneal administration to mice allow us to attribute GIZH-290 to the 4th class of toxicity – "lowtoxic substances". The study revealed the neurotoxic effects of GIZH-290, which may be due to the main pharmacological activity of the compound used in sublethal doses.Исследование острой токсичности является общепринятой процедурой доклинического исследования безопасности потенциальных лекарств. Исследовано соединение ГИЖ-290, являющее производным 4-фениллпирролидона– 2,6- диметиланилид (2-оксо-4-фенилпирролидин-1-ил) уксусной кислоты и обладающее ноотропным и противосудорожным действием. Результаты, полученные после однократного перорального и внутрибрюшинного введения мышам, позволяют отнести ГИЖ-290 к 4 классу токсичности – «малотоксичные вещества». В ходе исследования выявлены нейротоксические эффекты ГИЖ-290, которые могут быть обусловлены основной фармакологической активностью соединения, использованного в сублетальных дозах