Kharkov, Ukraine
Kharkov, Ukraine

Simon Kuznets Kharkiv National University of Economics is the largest economic higher educational and research institution in the Eastern Ukraine. Established in 1912, since 2013 the University is named after Simon Kuznets, its' noted alumnus.KhNUE provides a full range of undergraduate and postgraduate educational programs implementing multistage training, retraining and upgrading of qualification in 26 specialties in economy and business, management, public administration, informatics and cybernetics, computer science, publishing business and printing industry, tourism.


Time filter

Source Type

Grant
Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: SSH.2011.4.2-1 | Award Amount: 8.99M | Year: 2012

In order to gauge its significance, conceptual change in the study of borders must be seen in relation to fundamental social, economic and geopolitical transformations that have taken place in the past decades. In addition, major paradigmatic shifts in scientific debate, and in the social sciences in particular, must also be considered. Recognising the close interrelationships between social change and paradigm shifts, the EUBORDERSCAPES project will analyse the evolving concept of borders in terms of a mutually linked emergence of post-national, post-colonial, post-modernist and post-Communist strands of inquiry. State borders are the frame of reference, rather than ethnographic/anthropological boundaries. However, this approach emphasises the social significance and subjectivities of state borders while critically interrogating objective categories of state territoriality and international relations. The research proposed here will, furthermore, not only be focused at the more general, at times highly abstract, level of conceptual change. This approach will also allow us to compare and contrast how different and often contested conceptualisations of state borders (in terms of their political, social, cultural and symbolic significance) resonate in concrete contexts at the level of everyday life.


Zaslavskii O.B.,University of Kharkiv
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

Recently, alternatives to the Bañados, Silk, and West effect were proposed which are (i) due to the existence of naked singularities instead of the horizon and (ii) require neither horizon nor naked singularity. We reveal the main features of such alternatives in a model-independent way. The metric should be close to that of the extremal black hole, but the horizon should not form. Then, one can gain the unbound energy Ec.m. in the center-of-mass frame due to head-on collisions of particles near the would-be horizon. The energy measured at infinity can also be unbound. If self-gravitating shells collide, instead of particles, the underlying reason leading to unbound Ec.m. is the same. © 2013 American Physical Society.


McHedlov-Petrossyan N.O.,University of Kharkiv
Chemical Reviews | Year: 2013

Researchers have made efforts to unify the results in terms of solution chemistry and colloid science of compounds including fullerenes (C 60). The most principal thermodynamic property of any compound with respect to solution chemistry is its solubility. A vast collection of solubility values in individual and mixed solvents for fullerenes, specifically C 60 and C70 has been gathered. The solubility of fullerene molecules in the polar solvents is negligible despite their extremely high polarizability. The enhanced solubility in some nitrogen-containing liquids indicates the possibility of specific solvation or chemical modification of the fullerene molecule, making it worthwhile to regard such solvents as 'reactive' ones. The molar volume of the solid fullerene C60 is also independent of temperature and as a rule exceeds its partial molar volume in solution.


Zaslavskii O.B.,University of Kharkiv
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

We study the possibility of obtaining unbound energy E c.m. in the center-of-mass frame when two particles collide near the inner black hole horizon. We consider two different cases-when both particles move (i) in the same direction or (ii) in the opposite ones. We also discuss two different versions of the effect-whether an infinite energy can be released in the collision (strong version) or the energy E c.m. is finite but can be made as large as one likes (weak version). We demonstrate that the strong version of the effect is impossible in both cases (i) and (ii). In case (i) this is due to the fact that in the situation when E c.m. formally diverges on the horizon, one of particles passes through the bifurcation point where two horizons meet while the second particle does not, so collision does not occur. In case (ii), both particles hit different branches of the horizon. The weak version is possible in both cases, provided at least one of particles starts its motion inside the horizon along the direction of spatial symmetry from infinity. © 2012 American Physical Society.


Zaslavskii O.B.,University of Kharkiv
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

Two particles can collide in the vicinity of a rotating black hole producing the divergent energy in the center-of-mass frame [the Banados-Silk-West (BSW) effect]. However, it was shown recently that an observer at infinity can register quite modest energies E and masses m that obey some upper bounds. In the present work the counterpart of the original BSW effect is considered that may occur even for radial motion of colliding particles near charged static black holes. It is shown that in some scenarios there are no upper bounds on E and m. Thus the high-energetic and superheavy products of the BSW effect in this situation are, in principle, detectable at infinity. © 2012 American Physical Society.


Zaslavskii O.B.,University of Kharkiv
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

If two particles collide near the horizon of a rotating extremal black hole, under certain conditions the energy E c.m. in the center-of-mass frame can grow without limit (the so-called Banados-Silk-West effect). We consider collisions that produce two other particles. We show that for a generic dirty (surrounded by matter) black hole, there exist upper bounds on the energy and mass of product particles which can be detected at infinity. As a result, the positive energy gain is possible but is quite modest. It mainly depends on two numbers in which near-horizon behavior of the metric is encoded. The obtained results suggest astrophysical limits on the possibility of observation of the products of the collisional Banados-Silk-West effect. These results are consistent with recent calculations for the Kerr metric, extending them to generic dirty black holes. It is shown that for dirty black holes there are types of scenarios of energy extraction impossible in the Kerr case. © 2012 American Physical Society.


Zaslavskii O.B.,University of Kharkiv
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

We argue that the possibility of having infinite energy in the center-of-mass frame of colliding particles is a generic property of rotating black holes. We suggest a general model-independent derivation valid for dirty black holes. The earlier observations for the Kerr or Kerr-Newman metrics are confirmed and generalized. © 2010 The American Physical Society.


Zaslavskii O.B.,University of Kharkiv
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

A new simple and general explanation of the effect of acceleration of particles by black holes to infinite energies in the center of mass frame is suggested. It is based on kinematics of particles moving near the horizon. This effect arises when particles of two kinds collide near the horizon. For massive particles, the first kind represents a particle with the generic energy and angular momentum (I call them "usual"). Near the horizon, such a particle has a velocity almost equal to that of light in the frame that corotates with a black hole (the frame is static if a black hole is static). The second kind (called "critical") consists of particles with the velocity v


Zaslavskii O.B.,University of Kharkiv
Classical and Quantum Gravity | Year: 2011

We give a simple and general explanation for the effect of unbound acceleration of particles by black holes. It is related to the fact that the scalar product of a timelike vector of the four-velocity of an ingoing particle and the lightlike horizon generator tends to zero in some special cases, so the condition of 'motion forward in time' is marginally satisfied. In this sense, an ingoing particle with a special relation between parameters imitates the property of infinite redshift typical of any outgoing particle near the future horizon of a black hole. We check this assertion using the Reissner- Nordström and rotating axially symmetric metrics as examples. © 2011 IOP Publishing Ltd.


Zaslavskii O.B.,University of Kharkiv
JETP Letters | Year: 2011

Recently, in the series of works a new effect of acceleration of particles by black holes has been found. Under certain conditions, the energy in the center-of-mass system can become infinitely large. The essential ingredient of such effect is the rotation of a black hole. In this work, it has been argued that the similar effect exists for a nonrotating but charged black hole even for the simplest case of radial motion of particles in the Reissner-Nordström background. All main features of the effect under discussion due to rotating black holes have their counterpart for the nonrotating charged ones. © 2011 Pleiades Publishing, Ltd.

Loading University of Kharkiv collaborators
Loading University of Kharkiv collaborators