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Kiev, Ukraine

National University of Kyiv-Mohyla Academy , Natsional'nyi universytet "Kyyevo-Mohylians'ka akademiya") is a national, coeducational research university located in Kiev, Ukraine. The Kyiv-Mohyla Academy, the school's predecessor, was established in 1632. The NaUKMA is located on the Academy's grounds in the ancient Podil neighborhood. In 1991, it was re-organized, and teaching began the following year. NaUKMA has the highest level of accreditation as outlined by the Ministry of Education and Science of Ukraine, and is one of the thirteen educational institutions in Ukraine having a status of a research and autonomous university. NaUKMA takes part in numerous international university collaborations, such as the European University Association. The university is bilingual in Ukrainian and English. It is one of Ukraine’s few universities with internationally recognized diplomas.With around 3000 students, NaUKMA is one of the smallest universities in Ukraine. Alumni of the Kyiv-Mohyla Academy played a formative role in the intellectual and church life of Ukraine and Russia in 17th and 18th centuries. Among the most notable alumni were hetman Ivan Mazepa and philosopher Hryhori Skovoroda. The university is known as pro-Western and served as headquarters for Orange Revolution activists. Wikipedia.

Larger L.,University of Franche Comte | Penkovsky B.,University of Franche Comte | Penkovsky B.,National University of Kyiv-Mohyla Academy | Maistrenko Y.,University of Franche Comte | Maistrenko Y.,Ukrainian Academy of Sciences
Physical Review Letters | Year: 2013

Time-delayed systems are found to display remarkable temporal patterns the dynamics of which split into regular and chaotic components repeating at the interval of a delay. This novel long-term behavior for delay dynamics results from strongly asymmetric nonlinear delayed feedback driving a highly damped harmonic oscillator dynamics. In the corresponding virtual space-time representation, the behavior is found to develop as a chimeralike state, a new paradigmatic object from the network theory characterized by the coexistence of synchronous and incoherent oscillations. Numerous virtual chimera states are obtained and analyzed, through experiment, theory, and simulations. © 2013 American Physical Society.

Boyarsky A.,Leiden University | Ruchayskiy O.,Ecole Polytechnique Federale de Lausanne | Iakubovskyi D.,NASU Bogolyubov Institute for Theoretical Physics | Iakubovskyi D.,National University of Kyiv-Mohyla Academy | Franse J.,Leiden University
Physical Review Letters | Year: 2014

We report a weak line at 3.52±0.02keV in x-ray spectra of the Andromeda galaxy and the Perseus galaxy cluster observed by the metal-oxide-silicon (MOS) and p-n (PN) CCD cameras of the XMM-Newton telescope. This line is not known as an atomic line in the spectra of galaxies or clusters. It becomes stronger towards the centers of the objects; is stronger for Perseus than for M31; is absent in the spectrum of a deep "blank sky" data set. Although for each object it is hard to exclude that the feature is due to an instrumental effect or an atomic line, it is consistent with the behavior of a dark matter decay line. Future (non-)detections of this line in multiple objects may help to reveal its nature. © 2014 American Physical Society.

Cherniha R.,Ukrainian Academy of Sciences | Cherniha R.,National University of Kyiv-Mohyla Academy
Journal of Physics A: Mathematical and Theoretical | Year: 2010

New definitions of Q-conditional symmetry for systems of PDEs are presented, which generalize the standard notation of non-classical (conditional) symmetry. It is shown that different types of Q-conditional symmetry of a system generate a hierarchy of conditional symmetry operators. A class of twocomponent nonlinear reaction-diffusion systems is examined to demonstrate the applicability of the definitions proposed and it is shown when different definitions of Q-conditional symmetry lead to the same operators. © 2010 IOP Publishing Ltd.

Mikhalevich V.M.,National University of Kyiv-Mohyla Academy
Cybernetics and Systems Analysis | Year: 2011

A decision-making system consisting of a decision maker and a situation of decision making is considered. A parametric decision problem with financial incomes on which preferences obey a natural numerical order is investigated. A decision preference criterion that is the maximum of expected losses among distributions that constitute a statistical law describing the random nature of natural states is obtained. By this criterion, the class of decision makers is specified axiomatically. © 2011 Springer Science+Business Media, Inc.

Mikhalevich V.M.,National University of Kyiv-Mohyla Academy
Cybernetics and Systems Analysis | Year: 2011

This paper studies a decision-making system in which a situation has its numerical consequences with the natural order as the preference relation of a decision-maker. A rather wide class of situations is considered in which the decision-maker can use the criterion of the mentioned type under some rather natural conditions based on the principle of guaranteed result, which depends only on a regularity that describes randomness in a general sense, i.e., the regularity of a mass phenomenon representing a state of nature. © 2011 Springer Science+Business Media, Inc.

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