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Minsk, Belarus

The National Academy of science of Belarus is the national academy of Belarus. Wikipedia.

Sergeenko M.N.,National Academy of Sciences of Belarus
European Physical Journal C

The bound state of two massive constituent gluons is studied in the potential approach. The relativistic quasi-classical wave equation with the QCD-inspired scalar potential is solved by the quasi-classical method in the complex plane. Glueball masses are calculated with the help of the universal mass formula. The hadron Regge trajectories are given by the complex non-linear function in the whole region of the invariant variable t. The Chew-Frautschi plot of the leading glueball trajectory, α P(t), has the properties of a t-channel Pomeron, which is dual to the glueball states in the s channel. The imaginary part of the Pomeron is also calculated. © 2012 Springer-Verlag / Società Italiana di Fisica. Source

Merkulov V.S.,National Academy of Sciences of Belarus
JETP Letters

Features of the appearance of conical singularities in the presence of linear dichroism and natural optical activity at the point of intersection of dispersion curves of the principal refractive indices of a crystal have been considered. It has been shown that even insignificant dichroism results in the splitting of cones of optical axes into cones of singular optical axes (in a partial case, cones are degenerate into planes) between which a "gap" with identical velocities of proper waves appears. The splitting angle for the AgGaS2 crystal is estimated at about 5°. © 2014 Pleiades Publishing, Inc. Source

Sandomirskii S.G.,National Academy of Sciences of Belarus
Measurement Techniques

A formula is derived for estimating the effect of the magnetic properties of steel and of the error in measuring its coercive force on the error in measuring the magnetization in the coercive recovery process, in which features of the change in the magnetization on the limit hysteresis loop and the recovery curves are taken into account. It is established that, when standard requirements on the measuring apparatus are satisfied, the error in measuring the magnetization does not satisfy the requirements of magnetic structural analysis. Criteria for reducing it are determined. © 2013 Springer Science+Business Media New York. Source

Shutava T.G.,National Academy of Sciences of Belarus | Fakhrullin R.F.,Kazan Federal University | Lvov Y.M.,Louisiana Tech University
Current Opinion in Pharmacology

We discuss new trends in Layer-by-Layer (LbL) encapsulation of spherical and tubular cores of 50-150 nm diameter and loaded with drugs. This core size decrease (from few micrometers to a hundred of nanometers) for LbL encapsulation required development of sonication assistant non-washing technique and shell PEGylation to reach high colloidal stability of drug nanocarriers at 2-3 mg/mL concentration in isotonic buffers and serum. For 120-170 nm spherical LbL nanocapsules of low soluble anticancer drugs, polyelectrolyte shell thickness controls drug dissolution. As for nanotube carriers, we concentrated on natural halloysite clay nanotubes as cores for LbL encapsulation that allows high drug loading and sustains its release over tens and hundreds hours. Further drug release prolongation was reached with formation of the tube-end stoppers. © 2014 Published by Elsevier Ltd. Source

Parashchuk V.V.,National Academy of Sciences of Belarus
Materials Today: Proceedings

We have developed a process for producing high-adhesion metallic coatings which enables the fabrication of laser diode (LDs) structures with improved performance parameters on highly effective natural and synthetic diamond heat sinks (DHS). The mounting of CW laser diodes on DHS by a non-optimized process increases their power output by up to a factor of 2, considerably extends the linear (working) field of their power current characteristic and increases their slope efficiency by a factor of 1.5 - 2 relative to that of LDs on copper heat sinks. Optimization of the mounting process increases the slope efficiency only in the case of copper bases. The use of diamond heat sink bases extends the drive current range of pulsed diode bars by a factor of 2 - 3 and enables them to operate at more than one order of magnitude longer pump pulse durations (up to milliseconds) when the pulse repetition rate exceeds 10 Hz. © 2016 The Authors. Source

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