67 research outputs found
Active computing experiment in modeling the dynamics of mechatronic systems
In the process of debugging the structure of dynamic models of various technical systems, the need arises for direct intervention in the modeling process. The ability to control the modeling process in real time and, if necessary, change the values of phase variables or the structure of the model, is a flexible way to analyze the adequacy of the model using tool-oriented means. By changing the structure and parameters of the model during the modeling process, you can interactively analyze the influence of a particular parameter (block/macrostructure) on the behavior of a dynamic system. This method of carrying out calculations with the possibility of reconstructing the structure and parameters during the modeling process is called an active computational experiment. In the work, an active computational experiment is demonstrated using the example of a mechatronic system - a drive using simulation software ISMA (Novosibirsk, NSTU NETI) and SimInTech (Moscow, MSTU / 3V-Service LLC)
BIOCHEMICAL AND MINERAL PARAMETERS IN PIGS OF TWO BREEDS REARED IN LARGE INDUSTRIAL COMPLEXES OF WESTERN SIBERIA
Pig farming has a long tradition in Russian agriculture. The objectives of the present study were to investigate some indicators of blood biochemistry and hematology, and mineral metabolism in pigs (aged 6 months) of Landrace and Kemerovskaya breeds reared and kept in large industrial complexes named “Chistogorsky” and “Altaimyasoprom” (250 thousand heads in each) and to determine differences between two breeds in biochemical, hematological and mineral parameters. The Kemerovskaya breed belonged to local one but the Landrace breed was introduced from Ireland 3 generations ago. Concentrations of albumins, urea and phosphorus were higher in the Landrace breed then in the Kemerovskaya breed. In contrast, there was increased concentration of globulins and AST activity in animals of the Kemerovskaya breed in comparison with the Landrace breed. In addition, there were differences between breeds in some hematological indices and mineral metabolism parameters excluding phosphorus. The average population levels of the parametersinvestigated in two pig breeds could be used as reference values to evaluate animal’s interior at other pig farms in Western Siberia. The selected biochemical indices are recommended to farmers to assess the physiological status of animals in large industrial pig-raising plants
Anomalous behavior of the Hall effect in electron-doped superconductor Nd₂₋xCexCuO₄₊δ with nonstoichiometric disorder
Magnetoresistivity and Hall effect measured in magnetic fields up to B=9T (B║c, J║ab) in electrondoped Nd₂₋xCexCuO₄₊δ single crystal films with x = 0.14; 0.15; 0.18 and different oxygen content (δ) were studied in a temperature range of 0.4–4.2 K. The resistivity and Hall coefficient behaviors in the mixed state are discussed in the framework of flux-flow model with the inclusion of the back-flow of vortices owing to the pinning forces
Doping effect on the evolution of the pairing symmetry in n-type superconductor near antiferromagnetic phase boundary
We present the investigation results of the in-plane ρ(T) resistivity tensor at the temperature range 0.4–40 K in magnetic fields up to 90 kOe (H || c, J || ab) for electron-doped Nd₂₋xCexCuO₄+δ with different degree of disorder near antiferromagnetic–superconducting phase boundary. We have experimentally found that for optimally doped compound both the upper critical field slope and the critical temperature decrease with increasing of the disorder parameter (d-wave pairing) while in the case of the underdoped system the critical temperature remains constant and dHc₂/dT increases with increasing of the disorder (s-wave pairing). These features suggest a possible implementation of the complex mixture state as the s+id pairing
Doping effect on the anomalous behavior of the Hall effect in electron-doped superconductor NdCeCuO
Transport properties of NdCeCuO single crystal films
are investigated in magnetic fields up to 9T at =(0.4-4.2)K. An analysis
of normal state (at ) Hall coefficient dependence on Ce
doping takes us to a conclusion about the existence both of electron-like and
hole-like contributions to transport in nominally electron-doped system. In
accordance with (x) analysis an anomalous sign reversal of Hall effect
in mixed state at may be ascribed to a flux-flow regime for two
types of carriers with opposite charges.Comment: 14 pages, 5 figure
The fluxes of CN neutrinos from the Sun in case of mixing in a spherical layer in the solar core
The results of the calculation are presented for the fluxes of CN neutrinos
from the Sun in case of mixing in a spherical layer in the solar core,
consistent with the seismic data and with the measured solar neutrino fluxes.
It is shown that a substantial increase of the flux of neutrinos can
be gained in this case. The possible implications for experiment are discussed.Comment: 7 pages, 5 figures, minor correction
Tunable local polariton modes in semiconductors
We study the local states within the polariton bandgap that arise due to deep
defect centers with strong electron-phonon coupling. Electron transitions
involving deep levels may result in alteration of local elastic constants. In
this case, substantial reversible transformations of the impurity polariton
density of states occur, which include the appearance/disappearance of the
polariton impurity band, its shift and/or the modification of its shape. These
changes can be induced by thermo- and photo-excitation of the localized
electron states or by trapping of injected charge carriers. We develop a simple
model, which is applied to the center in . Further possible
experimental realizations of the effect are discussed.Comment: 7 pages, 3 figure
Studies of the Response of the Prototype CMS Hadron Calorimeter, Including Magnetic Field Effects, to Pion, Electron, and Muon Beams
We report on the response of a prototype CMS hadron calorimeter module to
charged particle beams of pions, muons, and electrons with momenta up to 375
GeV/c. The data were taken at the H2 and H4 beamlines at CERN in 1995 and 1996.
The prototype sampling calorimeter used copper absorber plates and scintillator
tiles with wavelength shifting fibers for readout. The effects of a magnetic
field of up to 3 Tesla on the response of the calorimeter to muons, electrons,
and pions are presented, and the effects of an upstream lead tungstate crystal
electromagnetic calorimeter on the linearity and energy resolution of the
combined calorimetric system to hadrons are evaluated. The results are compared
with Monte Carlo simulations and are used to optimize the choice of total
absorber depth, sampling frequency, and longitudinal readout segmentation.Comment: 89 pages, 41 figures, to be published in NIM, corresponding author: P
de Barbaro, [email protected]
Unconventional ferromagnetism and transport properties of (In,Mn)Sb dilute magnetic semiconductor
Narrow-gap higher mobility semiconducting alloys In_{1-x}Mn_{x}Sb were
synthesized in polycrystalline form and their magnetic and transport properties
have been investigated. Ferromagnetic response in In_{0.98}Mn_{0.02}Sb was
detected by the observation of clear hysteresis loops up to room temperature in
direct magnetization measurements. An unconventional (reentrant) magnetization
versus temperature behavior has been found. We explained the observed
peculiarities within the frameworks of recent models which suggest that a
strong temperature dependence of the carrier density is a crucial parameter
determining carrier-mediated ferromagnetism of (III,Mn)V semiconductors. The
correlation between magnetic states and transport properties of the sample has
been discussed. The contact spectroscopy method is used to investigate a band
structure of (InMn)Sb near the Fermi level. Measurements of the degree of
charge current spin polarization have been carried out using the point contact
Andreev reflection (AR) spectroscopy. The AR data are analyzed by introducing a
quasiparticle spectrum broadening, which is likely to be related to magnetic
scattering in the contact. The AR spectroscopy data argued that at low
temperature the sample is decomposed on metallic ferromagnetic clusters with
relatively high spin polarization of charge carriers (up to 65% at 4.2K) within
a cluster.Comment: 19 pages, 9 figures, 1 tabl
Measurements of and production in proton–proton interactions at in the NA61/SHINE experiment
Double-differential yields of and
resonances produced in \pp interactions
were measured at a laboratory beam momentum of 158~\GeVc. This measurement is
the first of its kind in \pp interactions below LHC energies. It was performed
at the CERN SPS by the \NASixtyOne collaboration. Double-differential
distributions in rapidity and transverse momentum were obtained from a sample
of 2610 inelastic events. The spectra are extrapolated to full phase
space resulting in mean multiplicity of (6.73
0.25 0.67) and (2.71
0.18 0.18). The rapidity and transverse momentum
spectra and mean multiplicities were compared to predictions of string-hadronic
and statistical model calculations
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