5,634 research outputs found
Helicity of convective flows from localized heat source in a rotating layer
Experimental and numerical study of the steady-state cyclonic vortex from
isolated heat source in a rotating fluid layer is described. The structure of
laboratory cyclonic vortex is similar to the typical structure of tropical
cyclones from observational data and numerical modelling including secondary
flows in the boundary layer. Differential characteristics of the flow were
studied by numerical simulation using CFD software FlowVision. Helicity
distribution in rotating fluid layer with localized heat source was analysed.
Two mechanisms which play role in helicity generation are found. The first one
is the strong correlation of cyclonic vortex and intensive upward motion in the
central part of the vessel. The second one is due to large gradients of
velocity on the periphery. The integral helicity in the considered case is
substantial and its relative level is high
Effects of picrotoxin on light adapted frog electroretinogram are not due entirely to its action in proximal retina
AbstractIn order to evaluate the site of action of picrotoxin (antagonist of ionotropic GABA receptors) on the electroretinographic (ERG) b- and d-waves, in this study we compared its effects on the intensityβresponse function of the ERG waves in intact light adapted frog eyecup preparations with its effects in eyecups, where the activity of proximal neurons was blocked by 1mMN-methyl-d-aspartate (MNDA). Picrotoxin markedly enhanced the b- and d-wave amplitude and slowed the time course of the responses at all stimulus intensities in the intact eyecups. Perfusion with NMDA alone caused significant enhancement of the b-wave amplitude and diminution of the d-wave amplitude without altering their time course in the entire intensity range. When picrotoxin was applied in combination with NMDA, an enhancement of the b-wave amplitude and slowing of its time course were observed at all stimulus intensities. The increase of the b-wave amplitude was significantly higher than that seen in NMDA group. Combined application of picrotoxin and NMDA caused an enhancement of the d-wave amplitude at the lower stimulus intensities and its diminution at the higher ones, while the d-wave time course was delayed over the entire intensity range. The results obtained indicate that a part of picrotoxin effects on the amplitude and time course of the photopic ERG b- and d-waves are due to its action in the distal frog retina
Quality of the Solution Sets of Parameter-Dependent Interval Linear Systems
Introduction By R , R denote the set of real vectors with n components, resp. the set of real n matrices. The set of all real compact intervals [a] := [a, a] := {a # a} is denoted by IR. We assume the reader is familiar with interval arithmetic [1]. By IR , IR denote the sets of interval n-vectors, resp. n matrices. Consider the linear system x = b(p), (1) where A(p) and b(p) depend a#ne-linearly on a parameter vector p . When p varies within a range [p] , the set of solutions to all A(p) x = b(p), p [p], called parametric solution set, is := # (A(p), b(p), [p]) := x = b(p) for some p [p]} . Denote by [A] = [A, A] := A([p]) , resp. [b] = [b, b] := b([p]) the interval matrix, resp. the interval vector, obtained from A(p), resp. b(p), substituting p by [p] and performing the corresponding interval operations. Hence the interval linear system x = [b], that is A([p]) x = b([p]) is a general non-parametric interval l
New programs for determining the main parameters of open clusters
A set of computer programs for the determination of the main parameters of open clusters, such as color excess, distance, and age, is developed. The set consists of two units. The first unit is designed to search for open clusters in wide fields using JHKs-photometry from various catalogs (2MASS, UKIDSS, VISTA) by identifying areas of high stellar density. The second unit determines the parameters of open clusters by fitting photometric diagrams. This is the unit described in the paper. Probable cluster members are identified by the proximity to the basic sequences on the J-(J - H) and Q-(J - H) diagrams. The color excess is determined by minimizing the deviations of Q values on the Q-(J - H) diagram. Ages and distance moduli are determined by comparing the color-magnitude diagrams with theoretical isochrones. Β© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Peculiarity of stellar kinematics in the solar vicinity
The peculiar velocities of nearby stars are studied. We determine the solar velocity components from the radial velocities and proper motions of stars and open clusters. We show that nearby stars are not very suitable for the determination of the solar motion components because of peculiarities in their velocity distribution. Β© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
The formation of subjectivity and norms in the process of adaptation of young employees at the enterprise
The aim of the publication is to determine the interrelation of the formation of subjective qualities and norms process of adaptation of young employees at the enterprise.Methods. The research methodology involves a comprehensive combination of the theoretical analysis and the results of applied research at the enterprises of the Sverdlovsk region. The dialectical method and comparative analysis are used.Results and theoretical novelty. The questions of adaptation of young employees at the enterprise are considered. The concepts of Β«subjectivityΒ» and Β«normsΒ» in philosophy are analyzed. Subjectivity is presented as a personal basis of social activity of the young worker at the entity; regulations β as a method of adaptation of the personality, individual to that community in which it emerged to be. The characteristics of the youth working at the industrial enterprise are disclosed on the basis of socio-philosophical analysis; youth policy at the industrialΒ enterprises is described; the formation of values and norms of young workers in the process of adapting the enterprise is observed. The personal subjectivity as the basis of social activity of the young worker in the enterprise is demonstrated. It is shown that relevance of subject qualities forming and regulations at youth is caused not only by the need of development of the identity of young workers, but also by economic safety of industrial enterprises wellbeing where their working career begins.Practical significance consists in the social-philosophical substantiation of interrelation of formation of subjective qualities and norms in the process of adaptation of young employees in the company, of the main provisions for the development of programs of adaptation of young employees at the enterprise; in providing the teaching social and humanitarian disciplines for bachelors and masters majoring in Β«Organization of Work with YouthΒ».Β Π¦Π΅Π»Ρ ΠΈΠ·Π»ΠΎΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ Π² ΡΡΠ°ΡΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ β ΠΎΠΏΡΠ΅Π΄Π΅Π»ΠΈΡΡ Π²Π·Π°ΠΈΠΌΠΎΡΠ²ΡΠ·Ρ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΡΠ±ΡΠ΅ΠΊΡΠ½ΡΡ
ΠΊΠ°ΡΠ΅ΡΡΠ² ΠΈ ΠΎΡΠ²ΠΎΠ΅Π½ΠΈΡ ΠΈΠ½Π΄ΠΈΠ²ΠΈΠ΄ΠΎΠΌ ΠΊΠΎΡΠΏΠΎΡΠ°ΡΠΈΠ²Π½ΡΡ
Π½ΠΎΡΠΌ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ Π°Π΄Π°ΠΏΡΠ°ΡΠΈΠΈ ΠΌΠΎΠ»ΠΎΠ΄ΡΡ
ΡΠ°Π±ΠΎΡΠ½ΠΈΠΊΠΎΠ² Π½Π° ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΈ. ΠΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΡ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΠΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΡ ΡΠ°Π±ΠΎΡΡ ΡΠΎΡΡΠΎΡΠ»Π° Π² ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠΌ ΡΠΎΡΠ΅ΡΠ°Π½ΠΈΠΈ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ΠΈ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΠΏΡΠΈΠΊΠ»Π°Π΄Π½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ Π½Π° ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΡΡ
Π‘Π²Π΅ΡΠ΄Π»ΠΎΠ²ΡΠΊΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ. ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π»ΠΈΡΡ Π΄ΠΈΠ°Π»Π΅ΠΊΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΌΠ΅ΡΠΎΠ΄ ΠΈ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· Π΄Π°Π½Π½ΡΡ
. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠ°Ρ Π½ΠΎΠ²ΠΈΠ·Π½Π°. Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ Π°ΡΠΏΠ΅ΠΊΡΡ Π°Π΄Π°ΠΏΡΠ°ΡΠΈΠΈ ΠΌΠΎΠ»ΠΎΠ΄ΡΡ
ΡΠ°Π±ΠΎΡΠ½ΠΈΠΊΠΎΠ² Π½Π° ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΈ. Π Π°ΡΠΊΡΡΡΠ° ΡΡΡΠ½ΠΎΡΡΡ ΡΠΈΠ»ΠΎΡΠΎΡΡΠΊΠΈΡ
ΠΏΠΎΠ½ΡΡΠΈΠΉ Β«ΡΡΠ±ΡΠ΅ΠΊΡΠ½ΠΎΡΡΡΒ» ΠΈ Β«Π½ΠΎΡΠΌΡΒ». Π‘ΡΠ±ΡΠ΅ΠΊΡΠ½ΠΎΡΡΡ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π° ΠΊΠ°ΠΊ Π»ΠΈΡΠ½ΠΎΡΡΠ½Π°Ρ ΠΎΡΠ½ΠΎΠ²Π° ΡΠΎΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΌΠΎΠ»ΠΎΠ΄ΠΎΠ³ΠΎ ΡΠ°Π±ΠΎΡΠ½ΠΈΠΊΠ° Π½Π° ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΈ; Π½ΠΎΡΠΌΡ β ΠΊΠ°ΠΊ ΡΠΏΠΎΡΠΎΠ± Π°Π΄Π°ΠΏΡΠ°ΡΠΈΠΈ Π»ΠΈΡΠ½ΠΎΡΡΠΈ, ΠΈΠ½Π΄ΠΈΠ²ΠΈΠ΄Π° ΠΊ ΡΠΎΠΉ ΠΎΠ±ΡΠ½ΠΎΡΡΠΈ, Π² ΠΊΠΎΡΠΎΡΠΎΠΉ ΠΎΠ½ Π½Π°Ρ
ΠΎΠ΄ΠΈΡΡΡ. ΠΠ° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΎΡΠΈΠ°Π»ΡΠ½ΠΎ-ΡΠΈΠ»ΠΎΡΠΎΡΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° Π²ΡΠΊΡΡΡΡ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΠΌΠΎΠ»ΠΎΠ΄Π΅ΠΆΠΈ, ΡΠ°Π±ΠΎΡΠ°ΡΡΠ΅ΠΉ Π½Π° ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΠΎΠΌ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΈ; ΠΎΠΏΠΈΡΠ°Π½Π° ΠΌΠΎΠ»ΠΎΠ΄Π΅ΠΆΠ½Π°Ρ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠ° Π΄Π°Π½Π½ΡΡ
ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΉ; ΠΏΡΠΎΡΠ»Π΅ΠΆΠ΅Π½ΠΎ ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΠ΅ ΡΠ΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΠΌΠΎΠ»ΠΎΠ΄ΡΡ
ΡΠ°Π±ΠΎΡΠ½ΠΈΠΊΠΎΠ² ΠΈ ΠΏΡΠΈΡΠ²ΠΎΠ΅Π½ΠΈΠ΅ ΠΈΠΌΠΈ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ Π°Π΄Π°ΠΏΡΠ°ΡΠΈΠΈ Π½ΠΎΡΠΌ, ΠΏΡΠΈΠ½ΡΡΡΡ
Π½Π° ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅. ΠΡΠΎΠ΄Π΅ΠΌΠΎΠ½ΡΡΡΠΈΡΠΎΠ²Π°Π½Π° Π»ΠΈΡΠ½ΠΎΡΡΠ½ΠΎ ΡΠ°Π·Π²ΠΈΠ²Π°ΡΡΠ°Ρ ΠΏΡΠΈΡΠΎΠ΄Π° ΡΠΎΡΠ΅Π²Π½ΠΎΠ²Π°Π½ΠΈΡ, Π΅Π³ΠΎ ΡΠΎΠ»Ρ Π² ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΡΡΠ±ΡΠ΅ΠΊΡΠ½ΡΡ
ΠΊΠ°ΡΠ΅ΡΡΠ². ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π°ΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΡΠ±ΡΠ΅ΠΊΡΠ½ΡΡ
ΠΊΠ°ΡΠ΅ΡΡΠ² ΠΈ Π½ΠΎΡΠΌ Ρ ΠΌΠΎΠ»ΠΎΠ΄Π΅ΠΆΠΈ ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½Π° Π½Π΅ ΡΠΎΠ»ΡΠΊΠΎ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ Π»ΠΈΡΠ½ΠΎΡΡΠΈ ΠΌΠΎΠ»ΠΎΠ΄ΡΡ
ΡΠ°Π±ΠΎΡΠ½ΠΈΠΊΠΎΠ², Π½ΠΎ ΠΈ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΡΡ ΠΈ Π±Π»Π°Π³ΠΎΠΏΠΎΠ»ΡΡΠΈΠ΅ΠΌ ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΡΡ
ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΉ, Π½Π° ΠΊΠΎΡΠΎΡΡΡ
Π½Π°ΡΠΈΠ½Π°Π΅ΡΡΡ ΠΈΡ
ΡΡΡΠ΄ΠΎΠ²Π°Ρ Π±ΠΈΠΎΠ³ΡΠ°ΡΠΈΡ.Β ΠΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠ°Ρ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π·Π°ΠΊΠ»ΡΡΠ°Π΅ΡΡΡ Π² ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ΠΈΡΡ
ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌ ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΠΌΠΎΠ»ΠΎΠ΄Π΅ΠΆΠ½ΠΎΠΉ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠΈ Π² ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΠΎΠΌ ΡΠ΅ΠΊΡΠΎΡΠ΅ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΠΊΠΈ. ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΡΡΠ°ΡΡΠΈ ΠΌΠΎΠ³ΡΡ ΡΠ»ΡΠΆΠΈΡΡ Π±Π°Π·ΠΎΠΉ Π΄Π»Ρ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌ Π°Π΄Π°ΠΏΡΠ°ΡΠΈΠΈ ΠΌΠΎΠ»ΠΎΠ΄ΡΡ
ΡΠ°Π±ΠΎΡΠ½ΠΈΠΊΠΎΠ² Π½Π° ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΈ ΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡΡΡ ΠΏΡΠΈ ΠΏΡΠ΅ΠΏΠΎΠ΄Π°Π²Π°Π½ΠΈΠΈ ΡΠΎΡΠΈΠ°Π»ΡΠ½ΠΎ-Π³ΡΠΌΠ°Π½ΠΈΡΠ°ΡΠ½ΡΡ
Π΄ΠΈΡΡΠΈΠΏΠ»ΠΈΠ½ Π΄Π»Ρ Π±Π°ΠΊΠ°Π»Π°Π²ΡΠΎΠ² ΠΈ ΠΌΠ°Π³ΠΈΡΡΡΠΎΠ² ΠΏΠΎ ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΠΎΡΡΠΈ Β«ΠΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΡ ΡΠ°Π±ΠΎΡΡ Ρ ΠΌΠΎΠ»ΠΎΠ΄Π΅ΠΆΡΡΒ»
Optical spectra, crystal-field parameters, and magnetic susceptibility of the new multiferroic NdFe3(BO3)4
We report high-resolution optical absorption spectra for NdFe3(BO3)4 trigonal
single crystal which is known to exhibit a giant magnetoelectric effect below
the temperature of magnetic ordering TN = 33 K. The analysis of the
temperature-dependent polarized spectra reveals the energies and, in some
cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We
perform crystal-field calculations starting from the exchange-charge model,
obtain a set of six real crystal-field parameters, and calculate wave functions
and magnetic g-factors. In particular, the values g(perpendicular) = 2.385,
g(parallel) = 1.376 were found for the Nd3+ ground-state doublet. We obtain
Bloc=7.88 T and |JFN|= 0.48 K for the values of the local effective magnetic
field at liquid helium temperatures at the Nd3+ site and the Nd - Fe exchange
integral, respectively, using the experimentally measured Nd3+ ground-state
splitting of 8.8 cm-1. To check reliability of our set of crystal field
parameters we model the magnetic susceptibility data from literature. A dimer
containing two nearest-neighbor iron ions in the spiral chain is considered to
partly account for quasi-one-dimensional properties of iron borates, and then
the mean-field approximation is used. The results of calculations with the
exchange parameters for Fe3+ ions Jnn = -6.25 K (intra-chain interactions) and
Jnnn = -1.92 K (inter-chain interactions) obtained from fitting agree well with
the experimental data.Comment: 13 pages, 8 figures, 2 table
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