1,395 research outputs found
Observations of Sy2 galaxy NGC 3281 by XMM-Newton and INTEGRAL satellites
We present here the results of our analysis of X-ray properties of Seyfert 2
galaxy NGC 3281, based on the observational data obtained by XMM-Newton and
INTEGRAL within the energy ranges 0.2-12 keV and 20-150 keV, respectively. The
XMM-Newton spectrum of this object is presented for the first time. We show
that fitting the X-ray spectrum of this galaxy with models based on the
reflection from the disc with infinite column density yields non-physical
results. More appropriate fit takes into account both transmitted and reflected
emission, passed through a gas-dusty torus-like structure. Keeping this in
mind, to model the inhomogeneous clumpy torus, we used the MYTorus model.
Hence, we propose that the torus of NGC 3281 is not continuous structure, but
it consists of separate clouds, which is in a good agreement with the results
of near-IR observations. Using this assumption, we found that the torus
inclination angle and the hydrogen column density are 66.98^{+2.63}_{-1.34}
degrees and 2.08^{+0.35}_{-0.18}x10^{24} cm^{-2}, respectively. Also, the
emission of the hot diffuse gas with temperature ~590 eV and warm absorption
were detected.Comment: 8 pages, 5 figures, 2 tables, accepted for publication in Advances in
Astronomy and Space Physic
Grain refinement in a Cu-Cr-Zr alloy during multidirectional forging
Structural changes during plastic deformation were studied in a Cu-0.3%Cr-0.5%Zr alloy subjected to multidirectional forging up to a total strain of 4 at the temperatures of 300 K and 673 K. The deformation behavior was characterized by a rapid increase in the flow stress at an early deformation followed by a steady-state flow at large strain. The development of the new ultrafine grains resulted from the progressive increase in the misorientations of the strain-induced low-angle boundaries, which evolve into high-angle boundaries with increasing cumulative strain through a strain-induced continuous reaction that is quite similar to continuous dynamic recrystallizatio
Multiple quantum NMR dynamics of spin-1/2 carrying molecules of a gas in nanopores
We consider the multiple quantum (MQ) NMR dynamics of a gas of spin carrying
molecules in nanocavities.
MQ NMR dynamics is determined by the residual dipole-dipole interactions
which are not averaged completely due to the molecular diffusion in nanopores.
Since the averaged non-secular Hamiltonian describing MQ NMR dynamics depends
on only one coupling constant, this Hamiltonian commutes with the square of the
total spin angular momentum .
We use the basis of common eigenstates of and the projection of
on the external magnetic field for investigation of MQ NMR dynamics.
This approach allows us to study MQ NMR dynamics in systems consisting of
several hundreds of spins. The analytical approximation of the stationary
profile of MQ coherences is obtained.
The analytical expressions for MQ NMR coherence intensities of the five-spin
system in a nanopore are found.
Numerical investigations allow us to find the dependencies of intensities of
MQ coherences on their orders (the profiles of MQ coherences) in systems
consisting of 600 spins and even more.
It is shown that the stationary MQ coherence profile in the considered system
is an exponential one.Comment: 8 pages, 5 figure
TECHNOLOGY FOR TEST-SYSTEMS FOR DIAGNOSIS OF MODIFIED PROTEINS (PROTEOPATHY) UNDERLYING SOCIAL DISEASES (Report 2)
A high-tech technology for highly sensitive test systems is proposed based on conjugates "polymer microsphere-bioligand" for express diagnosis of autoantibodies to the modified protein (proteopathy) for example, thyroglobulin, using the method of latex agglutination reaction (in vitro).A high-tech technology for highly sensitive test systems is proposed based on conjugates "polymer microsphere-bioligand" for express diagnosis of autoantibodies to the modified protein (proteopathy) for example, thyroglobulin, using the method of latex agglutination reaction (in vitro)
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