155 research outputs found
Dialectics of Efficient Change Management in the Regional Social Systems
The research has placed emphasis on the role of the social infrastructure sectors, providing social services, which facilitate human potential development in a modern state. Theoretical positions of the scientist considering the nature of social benefits and necessity of the government support for the social sphere has been summarized in the article. The state of the Russian social infrastructure sectors has been considered and the analysis of their performance compared to these of the social infrastructure sectors in other countries has been conducted in the research work. Taking into consideration the performance ratings of the effectiveness of the national education systems, the countries around the world concerning the effectiveness of the health system, the countries around the world concerning the social development level in 2014, the authors have proposed the conceptual approach that makes it possible to consider the correlation and interrelation of the level of the government financing of the social sphere and the dynamics of the contribution of social infrastructure sectors in the development of the human capital, ensuring the gross domestic product increase. The necessity of making innovative changes in the socio-economic systems of the social infrastructure sectors, to improve their performance, taking into account the results obtained, in the first place, in health care, has been wellgrounded and theoretical approaches to the changes management in the socio-economic systems has been studied in the article. The theoretical approaches to the changes management in the socio-economic systems have been studied by the authors. Based on the conducted studies and the formed theoretical basis for improving the level of changes management in open socio-economic systems, for the purpose of development of the theoretical and methodological approaches to changes management as applied to health care sphere, optimization model of management of health care organizations by way of ranking of manageable and unmanageable changes has been proposed. The possibility of using management optimization by way of ranking of manageable and unmanageable changes in the health care management at different levels has been confirmed with high-performance indicators at the micro-, meso- and macro levels in the sector, by the example of implementation of the national project “Health” and innovative organizational changes facilitating the return to work of patients of the working age, which are involved in the gross domestic product formation in the city of Yekaterinburg.The article has been prepared with the support of the Russian Science Foundation grant No. 14-18-00456 “Support of geoecosocioeconomic approach to development of strategic nature resources capacity of the low-studied northern territories within the investment project “Arctic — Central Asia”
Impurity-induced moments in underdoped cuprates
We examine the effect of a nonmagnetic impurity in a two-dimensional spin
liquid in the spin-gap phase, employing a drone-fermion representation of
spin-1/2 operators. The properties of the local moment induced in the vicinity
of the impurity are investigated and an expression for the nuclear-magnetic-
resonance Knight shift is derived, which we compare with experimental results.
Introducing a second impurity into the spin liquid an antiferromagnetic
interaction between the moments is found when the two impurities are located on
different sublattices. The presence of many impurities leads to a screening of
this interaction as is shown by means of a coherent-potential approximation.
Further, the Kondo screening of an impurity-induced local spin by charge
carriers is discussed.Comment: 8 pages, 1 figure. To be published in Phys. Rev. B, Vol. 56, No. 1
rac-Diethyl 6-hydroxy-4-[(2-hydroxyethyl)amino]-6-methyl-2-phenylcyclohex-3-ene-1,3-dicarboxylate
The title compound, C21H29NO6, is chiral with three stereogenic centres. The crystal is a racemate and consists of enantiomeric pairs with the relative configuration rac-(2R*,3S*,4R*). The ethyl fragment of the ethoxycarbonyl group at position 1 is disordered in a 0.60:0.40 ratio. The crystal packing displays intermolecular O—H⋯O hydrogen bonding. An intramolecular N—H⋯O hydrogen bond also occurs
Analysis of Users’ Sentiments in Social Media (on the Example of the Astrakhan Region)
The article is devoted to the studying of the opinions and sentiments of users of regional communities in the social network VKontakte using methods of machine analysis of text data, supplemented by sociological research methods. In the course of the study, we identified a list of current topics discussed by the inhabitants of the region, determined the most frequently mentioned persons, and analyzed the tone of their mention. Additionally, on the basis of the obtained results, the index of subjective (non-) well-being (ISW) was calculated for each district of the region and a map of the emotional coloring of posts from the communities of the analyzed social network was built. The results of the study can be used to monitor the situation in the region, finding problem areas, elicitation opinion leaders (popular personalities of the region that have a special influence on the opinion of the population), as well as identify the most interesting topics and urgent problems for the population. In perspective, this method of monitoring the social sentiments of the population of the region can be improved by automating the addition of new data to the analytical project. In the future, the addition of mathematical models to the system will make it possible to create graphs for predicting further changes in the region
Electron-lattice kinetics of metals heated by ultrashort laser pulses
We propose a kinetic model of transient nonequilibrium phenomena in metals
exposed to ultrashort laser pulses when heated electrons affect the lattice
through direct electron-phonon interaction. This model describes the
destruction of a metal under intense laser pumping. We derive the system of
equations for the metal, which consists of hot electrons and a cold lattice.
Hot electrons are described with the help of the Boltzmann equation and
equation of thermoconductivity. We use the equations of motion for lattice
displacements with the electron force included. The lattice deformation is
estimated immediately after the laser pulse up to the time of electron
temperature relaxation. An estimate shows that the ablation regime can be
achieved.Comment: 7 pages; Revtex. to appear in JETP 88, #1 (1999
Van der Waals Excluded Volume Model of Multicomponent Hadron Gas
A generalization of the Van der Waals excluded volume procedure for the
multicomponent hadron gas is proposed. The derivation is based on the grand
canonical partition function for the system of particles of several species
interacting by hard core potentials. The obtained formulae for thermodynamical
quantities are consistent with underlying principles of statistical mechanics
as well as with thermodynamical identities. The model can be applied to the
analysis of experimental data for particle number ratios in relativistic
nucleus-nucleus collisions.Comment: 8 page
Quantum spin fluctuations and evolution of electronic structure in cuprates
Correlation effects in CuO layers give rise to a complicated landscape of
collective excitations in high-T cuprates. Their description requires
an accurate account for electronic fluctuations at a very broad energy range
and remains a challenge for the theory. Particularly, there is no conventional
explanation of the experimentally observed `resonant' antiferromagnetic mode,
which is often considered to be a mediator of superconductivity. Here we model
spin excitations of the hole-doped cuprates in the paramagnetic regime and show
that this antiferromagnetic mode is associated with electronic transitions
between anti-nodal X and Y points of the quasiparticle band that is pinned to
the Fermi level. We observe that upon doping of 7-12\% the electronic spectral
weight redistribution leads to the formation of a very stable quasiparticle
dispersion due to strong correlation effects. The reconstruction of the Fermi
surface results in a flattening of the quasiparticle band at the vicinity of
the nodal point, accompanied by a high density of charge
carriers. Collective excitations of electrons between the nodal and points form the additional magnetic holes state in
magnetic spectrum, which protects the antiferromagnetic fluctuation. Further
investigation of the evolution of spin fluctuations with the temperature and
doping allowed us to observe the incipience of the antiferromagnetic ordering
already in the paramagnetic regime above the transition temperature.
Additionally, apart from the most intensive low-energy magnetic excitations,
the magnetic spectrum reveals less intensive collective spin fluctuations that
correspond to electronic processes between peaks of the single-particle
spectral function
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