Odessa, Ukraine

The National Academy of science of Ukraine is the highest research body in Ukraine, as a self-governing state-funded organization. It is the main research institution along with the five other academies specialized in various scientific disciplines. NAS Ukraine consists of numerous departments, sections, research institutes, scientific centers and various other supporting scientific organizations. The Academy reports on the annual basis to the Cabinet of Ministers of Ukraine.The presidium of the academy is located at the following address vulytsia Volodymyrska, 57, across the street from the Building of Pedagogical Museum where used to preside the Central Council during the independence period of 1917-18. Wikipedia.

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Stanislavsky A.,Ukrainian Academy of Sciences | Stanislavsky A.,University of Kharkiv | Weron K.,Wroclaw University of Technology
Reports on Progress in Physics | Year: 2017

The paper is devoted to recent advances in stochastic modeling of anomalous kinetic processes observed in dielectric materials which are prominent examples of disordered (complex) systems. Theoretical studies of dynamical properties of 'structures with variations' (Goldenfield and Kadanoff 1999 Science 284 87-9) require application of such mathematical tools - by means of which their random nature can be analyzed and, independently of the details distinguishing various systems (dipolar materials, glasses, semiconductors, liquid crystals, polymers, etc), the empirical universal kinetic patterns can be derived. We begin with a brief survey of the historical background of the dielectric relaxation study. After a short outline of the theoretical ideas providing the random tools applicable to modeling of relaxation phenomena, we present probabilistic implications for the study of the relaxation-rate distribution models. In the framework of the probability distribution of relaxation rates we consider description of complex systems, in which relaxing entities form random clusters interacting with each other and single entities. Then we focus on stochastic mechanisms of the relaxation phenomenon. We discuss the diffusion approach and its usefulness for understanding of anomalous dynamics of relaxing systems. We also discuss extensions of the diffusive approach to systems under tempered random processes. Useful relationships among different stochastic approaches to the anomalous dynamics of complex systems allow us to get a fresh look at this subject. The paper closes with a final discussion on achievements of stochastic tools describing the anomalous time evolution of complex systems. © 2017 IOP Publishing Ltd.

Kalyuzhnyi Y.V.,Ukrainian Academy of Sciences | Jamnik A.,University of Ljubljana | Cummings P.T.,Vanderbilt University
Soft Matter | Year: 2017

A simple model of dimerizing hard spheres with highly nontrivial fluid-solid phase behavior is proposed and studied using the recently proposed resummed thermodynamic perturbation theory for central force (RTPT-CF) associating potentials. The phase diagram has the fluid branch of the fluid-solid coexistence curve located at temperatures lower than those of the solid branch. This unusual behavior is related to the strong dependence of the system excluded volume on the temperature, which for the model at hand decreases with increasing temperature. This effect can be also seen for a wide family of fluid models with an effective interaction that combines short range attraction and repulsion at a larger distance. We expect that for sufficiently high repulsive barrier, such systems may show similar phase behavior. © The Royal Society of Chemistry.

Bulavatsky V.M.,Ukrainian Academy of Sciences
Cybernetics and Systems Analysis | Year: 2017

We construct a generalized mathematical model to describe the fractional differential dynamics of filtration processes in fractured porous media, based on the use of the concept of Hilfer–Prabhakar fractional derivative. Within the framework of this model, we obtain a number of closed form solutions to boundary-value problems of filtration theory for modeling the dynamics of pressures at launch of wells in case of plane-radial filtration, as well as by activity of galleries under plane-parallel filtration. © 2017 Springer Science+Business Media New York

Shylo P.V.,Ukrainian Academy of Sciences
Cybernetics and Systems Analysis | Year: 2017

A new repeated iterated tabu search for the quadratic assignment problem is developed. A comparative study of this algorithm and the best existing algorithms for solving this problem has shown its competitiveness with respect to both its performance and quality of solutions. © 2017 Springer Science+Business Media New York

Dunaev B.B.,Ukrainian Academy of Sciences
Cybernetics and Systems Analysis | Year: 2017

Cyclic economic development is a result of existed and existing changes in the relation between demand and supply in the goods market that upset its equilibrium, but this equilibrium is restored with constant time rhythms in the course of self-regulation of the number of persons engaged in the production sphere depending on a conjuncture of consumer demand. It is shown that the observed Kondratyev (Kondratieff) waves are measured in basic prices by the real value of the capital available in the production sphere and are representable by its time graphs. © 2017 Springer Science+Business Media New York

Skobelev V.V.,Ukrainian Academy of Sciences
Cybernetics and Systems Analysis | Year: 2017

This paper carries out a set-theoretic analysis of the structure of attributed transition systems without hidden transitions. Partial operations of composition of histories and traces are proposed. It is shown that these operations can be used to parallelize the design of coverings of sets of histories and traces. Equivalence relations on a set of states are extracted. In terms of systems with singled out initial and final states and also systems with singled out initial states and sets of final limit sets of states, classes of safe and correct systems are defined. The algebra of such systems is proposed. © 2017 Springer Science+Business Media New York

Gladky A.V.,Ukrainian Academy of Sciences
Cybernetics and Systems Analysis | Year: 2017

We consider numerical modeling of the propagation of pollution in the air on the basis of geometrical splitting method for three-dimensional nonstationary convection diffusion equations. Splitting difference schemes in the form of explicit computing schemes are proposed to solve the obtained one-dimensional problems. The approximation, monotonicity, and stability of the proposed difference schemes are investigated. © 2017 Springer Science+Business Media New York

Gulevsky O.K.,Ukrainian Academy of Sciences | Schenyavsky I.I.,Ukrainian Academy of Sciences
Problems of Cryobiology and Cryomedicine | Year: 2017

Antihypoxant activity of low-molecular weight (below 5 kDa) fraction, obtained by ultrafiltration from cryohemolysate of umbilical/placental bovine and peripheral blood of 3-month-old calves and 4–5-year-old cows was studied. It was shown that injections of the fraction derived from bovine cord blood and the one of 3-month-old calves unlike low molecular fraction of bovine blood significantly increased the survival time of mice in confined space and inhibited the accumulation of malon dialdehyde and lipid hydroperoxides in brain tissue at experimental confined space hypoxia. The effect after a preliminary 5-days course of injections of these drugs was the most pronounced. Thus, low molecular weight fraction below 5 kDa of blood at the early stages of ontogenesis had lower antihypoxant activity in animals with age. The obtained results testify to the fact that cryogenic techologies enable to use bovine cord blood as a raw material source for the production of pharmaceuticals with an antihypoxant action. © 2017 O.K. Gulevsky et al., Published by the Institute for Problems of Cryobiology and Cryomedicine.

Gordiyenko O.I.,Ukrainian Academy of Sciences | Kovalenko I.F.,Ukrainian Academy of Sciences
Problems of Cryobiology and Cryomedicine | Year: 2017

During freezing of cell suspensions the ionic strength of extracellular and, subsequently, intracellular media is responsible for the changes in membrane potential of cells. In this research we revealed the temperature and concentration dependencies of the surface potential of human erythrocytes during freezing of the cell suspension at the points corresponding to the values of temperature and 1:1 concentration of the electrolyte according to the phase diagram of a water-NaCl binary system. The concentrations of sodium ions on the surface of erythrocytes depending on concentration and temperature of the bulk solution were determined. It has been shown that the concentration of sodium ions on the surface of cells was 1.5 times higher than that in the bulk solution. The kink of surface potential temperature dependence for human erythrocytes for 0.15 and 0.3 M concentrations of 1:1 electrolyte within 8. 12°C temperature range was of special interest. This temperature dependence feature of the surface potential calculated for the charged surface with a particular surface charge density from the purely physical considerations without taking into account the structure and composition of the surface could be one of the causes of rearrangements in membrane at these temperatures. Misbalance of electrostatic interactions on the surface of membrane outer monolayer appeared as a result of an increased concentration of counterions on the surface of cells and correspondingly the reduced surface potential might trigger the rearrangements and changes in relationships between membrane protein and lipid components. © 2017 O.I. Gordiyenko et al., Published by the Institute for Problems of Cryobiology and Cryomedicine.

Chizh N.A.,Ukrainian Academy of Sciences
Problems of Cryobiology and Cryomedicine | Year: 2017

This literature review discusses some issues concerning the use of cryosurgical method in experimental and clinical endoscopic surgery. Considering the pathogenetic mechanisms of low temperature effect on biological structures we demonstrated here the advantages and disadvantages of cryosurgical method application in medical practice. Underpinned by the clinical research data a positive effect of cryosurgical approaches using endoscopic equipment was shown and the prospects for further endoscopic cryosurgery development were determined. © 2017 N.A. Chizh, Published by the Institute for Problems of Cryobiology and Cryomedicine.

Luzanov A.V.,Ukrainian Academy of Sciences
Functional Materials | Year: 2017

The moderate-size carbon nanoclusters with paramagnetic color centers are studied by using a rather good-working simplified scheme of CNDOL type. Various electronic structure aspects of the clusters are studied. These are the localization of molecular orbitas, the electronic excitation localization and charge-transfer structure of the lowest triplet-triplet transitions, spin density distributions and spin correlations in the ground and excited states. The comparison is made between the respective characteristics of the diamondoid with nitrogen-vacancy (NV-) and oxygen-vacancy color centers. It is shown that in the asymmetrical NV- center, significant variations of excitation localization and charge/spin transfer take place whereas the energetic properties vary slightly. © 2017. STC "Institute for Single Crystals". All rights reserved.

Brodskii R.Y.,Ukrainian Academy of Sciences
Functional Materials | Year: 2017

It was studied in the work the properties of volume inclusions of transparent phase in an opaque sample, that grown layerwise. It was studied a case in which the regions of transparent phase of a new layer appear only above the regions of transparent phase of the previous layer. Numerical characteristics of this process - the average number (n) of "islands" of transparent phase in a new layer on one such "island" of previous layer. It was research the formation of regions of the transparent phase in separate layers and formation of through "windows of transparency" in the final sample. The law of changing of transparent phase area with the number of layer was received at different values of (n). Mechanisms, that determine the form of different parts of the law was pointed. For final sample the distribution density of "windows" on area was obtained, analytically for separate exactly solvable case and numerically in the general case. It is shown that the density has three different parts, the properties of these parts was studied at different (n). It was found the law of change of the total transparency of the sample with (n). © 2017. STC Institute for Single Crystals.

Khoma R.E.,Odessa I I Mechnikov National University | Khoma R.E.,Ukrainian Academy of Sciences
Russian Journal of Physical Chemistry A | Year: 2017

ΔG, ΔH, and ΔS of the second dissociation step of aminomethanesulfonic acid and its N-methyl, N-hydroxyethyl, N-(tert-butyl), N-benzyl derivatives in aqueous solutions (at the isoelectric point where the ionic strength is 4.75 × 10–4 М) are determined on basis of pH measurements at 293–313 K. It is found that an increase of the electron-acceptor properties of the substituents at nitrogen atom reduces the effect temperature has on the thermodynamic functions of dissociation. Enthalpy–enthropy compensation at an isothermodynamic temperature of 303 K is recorded. © 2017, Pleiades Publishing, Ltd.

Shcherban N.D.,Ukrainian Academy of Sciences
Theoretical and Experimental Chemistry | Year: 2016

Data on the methods of preparation, structure, physicochemical properties, and functional characteristics of carbon nitride have been summarized and analyzed. Promise for the use of porous carbon nitride of various stoichiometries in photocatalysis, catalysis, and adsorption has been noted. Some general observations about the state and possible directions for the development of research in this field of physical chemistry were given. © 2016, Springer Science+Business Media New York.

Pototskaya V.V.,Ukrainian Academy of Sciences | Gichan O.I.,Ukrainian Academy of Sciences
Electrochimica Acta | Year: 2017

The generalized Gerischer impedance theoretical model for a sinusoidal-shaped electrode has been developed. The impedance is presented as an expansion by the small parameter, which is equal to the ratio of the amplitude to period length of surface roughness. For the case of a weak roughness, we have derived the general expression for the complex roughness function and established its limiting behavior. It is shown that roughness does influence the value of parameters extracted from low − frequency region of an impedance measurement. In anomalous intermediate − frequency region, impedance exhibits frequency dispersion which is caused by the roughness. At high frequencies, the Gerischer impedance acts like the Warburg impedance © 2017 Elsevier Ltd

Rivel T.,University of Burgundy | Yesylevskyy S.O.,Ukrainian Academy of Sciences | Ramseyer C.,University of Burgundy
Carbon | Year: 2017

Non-covalent functionalization of graphene with phospholipids is a promising technique for biosensing applications and intracellular delivery of analytical probes and drugs. However, molecular details of the self-assembly of lipids on graphene surface is still poorly understood and hard to control. There is a clear lack of understanding of why various kinds of lipid aggregates can form on graphene. In the current work, we address this question by investigating equilibrium and dynamical properties of lipid layers adsorbed on graphene in water environment and in vacuum using all-atom Molecular Dynamics simulations. It is shown that a variety of lipid aggregates can form on top of graphene depending on initial orientation, number of adsorbed lipid layers and the presence of water. The lipid layers self-organize and reorient in order to minimize hydrophobic mismatch on graphene-lipid, lipid-lipid and water-lipid interfaces. Obtained structures range from homogeneous layers to the networks of inverted micelle-like structures and weakly bound cylindrical micelles on top of monolayers. Our results are in excellent agreement with recent experimental findings. Another pronounced effect of graphene is the strong ordering of the lipid atoms which are in direct contact with it. In all studied systems at least two well-structured atomic shells are formed above the graphene surface at the distances of 0.35 and 0.85 nm. © 2017 Elsevier Ltd

Verves Y.,Ukrainian Academy of Sciences | Khrokalo L.,Kharkiv Polytechnic Institute
Turkish Journal of Zoology | Year: 2017

Phrosinella kocaki Verves & Khrokalo sp. nov. from Israel is described as being new to science. A similar species, Phrosinella kozlovi (Rohdendorf, 1925), is recorded for the first time for Turkey and redescribed. Faunistic and ecological data on 31 species from 3 genera of subtribe Phrosinellina are given: Gymnoprosopa Townsend, 1892 (6 species); Gymnopsidia Shewell, 1987 (1 species); and Phrosinella Robineau-Desvoidy, 1863 (24 species). An original key to the genera and subgenera is presented. © TÜBİTAK.

Kaliuzhna M.O.,Ukrainian Academy of Sciences
Vestnik Zoologii | Year: 2016

Morphological data on metanotal sculpture of aphidiine wasps (Hymenoptera, Braconidae, Aphidiinae), are reviewed based on the specimens collected in Ukraine. Specimens of 20 species of 13 genera were studied using light and scanning electron microscopy. Differences in menatonal morphology appear diagnostic for some genera or generic groups, such as tribes and subtribes. Seven general types of metanotal sculpture were distinguished. The proposed diagnostic characters are: The relative proportions of the metanotum and its parts (metascutellum, metascutellar arms), the shape and setation of the metascutellum, the number and form of the carinae arising from the base of metascutellum toward the mesoscutellum. To facilitate describing the structure of the metanotum in Aphidiinae, following measurements were established: The length and width of the metanotum and the metascutellum, the length of the metascutellar arms. The discovered characters could be used as additional diagnostic tools for aphidiine identification, and perhaps also in studies on their evolution and phylogeny. © by M. O. Kaliuzhna 2017.

Yakovkin I.N.,Ukrainian Academy of Sciences
Surface Science | Year: 2017

The relativistic band structures of the IV group honeycomb monolayers, from graphene to plumbene (C-Si-Ge-Sn-Pb), have been calculated within DFT in Local Density Approximation (LDA). Basing on the obtained results, we suggest that the spin-orbit coupling leads to opening of the band gaps and therefore will unavoidably cause the destruction of the perfect shape of Dirac cones which is responsible for the existence of the massless Fermions. The applicability of ordinary non-relativistic DFT calculations of bands for graphene-like layered structures is discussed in this regard. © 2017 Elsevier B.V.

Mykhaylenko N.F.,Ukrainian Academy of Sciences | Zolotareva E.K.,Ukrainian Academy of Sciences
Nanoscale Research Letters | Year: 2017

Nanoaquachelates, the nanoparticles with the molecules of water and/or carboxylic acids as ligands, are used in many fields of biotechnology. Ultra-pure nanocarboxylates of microelements are the materials of spatial perspective. In the present work, the effects of copper and selenium nanoaquachelates carboxylated with citric acid on biomass accumulation of the green algae Chlorella vulgaris were examined. Besides, the efficiency of the reactions of the light stage of photosynthesis was estimated by measuring chlorophyll a fluorescence. The addition of 0.67–4 mg L−1 of Cu nanocarboxylates resulted in the increase in Chlorella biomass by ca. 20%; however, their concentrations ranging from 20 to 40 mg L−1 strongly inhibited algal growth after the 12th day of cultivation. Se nanocarboxylates at 0.4–4 mg L−1 concentrations also stimulated the growth of C. vulgaris, and the increase in biomass came up to 40–45%. The addition of Se nanocarboxylates at smaller concentrations (0.07 or 0.2 mg L−1) at first caused the retardation of culture growth, but that effect disappeared after 18–24 days of cultivation. The addition of 2–4 mg L−1 of Cu nanocarboxylates or 0.4–4 mg L−1 of Se nanocarboxylates caused the evident initial increase in such chlorophyll a fluorescence parameters as maximal quantum yield of photosystem II photochemistry (Fv/Fm) and the quantum yield of photosystem II photochemistry in the light-adapted state (Fv'/Fm'). Photochemical fluorescence quenching coefficients declined after 24 days of growth with Cu nanocarboxylates, but they increased after 6 days of the addition of 2 or 4 mg L−1 Se nanocarboxylates. Those alterations affected the overall quantum yield of the photosynthetic electron transport in photosystem II. © 2017, The Author(s).

Dobushovskyi D.A.,Ukrainian Academy of Sciences | Shvaika A.M.,Ukrainian Academy of Sciences | Zlatic V.,University of Split
Physical Review B - Condensed Matter and Materials Physics | Year: 2017

The effect of correlated hopping on the charge and heat transport of strongly correlated particles is studied for the Falicov-Kimball model on the Bethe lattice. Exact solutions for the one-particle density of states (DOS) and two-particle transport function (the "quasiparticle" scattering time) are derived using dynamical mean-field theory. For a wide range of the correlated hopping, the transport function exhibits singularities due to the resonant two-particle contribution, whereas the one-particle DOS does not show any anomalous features. By tuning the number of itinerant electrons, so as to bring the Fermi level close to the resonant frequency, we get a large increase of the electrical and thermal conductivities, and the thermoelectric power. When the hopping amplitude between the occupied sites is reduced sufficiently, the itinerant electrons localize in the clusters of sites occupied by f electrons. This gives rise to an additional narrow band in the DOS between the lower and upper Hubbard bands but has only a minor effect on the thermoelectric properties. © 2017 American Physical Society.

Veselovska G.,Ukrainian Academy of Sciences | Khlopov G.,Ukrainian Academy of Sciences
International Journal of Remote Sensing | Year: 2017

The article is devoted to solving the actual scientific task of restoration of precipitation microstructural characteristics by double-frequency remote sensing with a glance of rain particles nonsphericity. At that, the calculations of radar cross section of raindrops were performed by approximated methods on the basis of spherical drops of equivalent volume and dipole scattering. Results obtained are compared with the calculations of the rigorous method of moments. It was shown that errors of approximate calculations of backscattering characteristics are smaller for the same vertical polarization of frequency channels of double-frequency radar. In addition, the behaviour of the differential backscattering cross section is studied. © 2017 Informa UK Limited, trading as Taylor & Francis Group.

Boylo I.V.,Ukrainian Academy of Sciences
Metallofizika i Noveishie Tekhnologii | Year: 2016

In the paper, numerical calculations of both the photon-assisted shot-noise power and the Fano factor for the mesoscopic normal metal - insulator - superconductor structures are performed. The temperature effect on the value of photon-assisted current fluctuations in a tunnel junction is studied. Modelling of the nonequilibrium current fluctuations demonstrates an enhancement of the noise spectral density with increasing the ac signal frequency. As shown, the Fano factor in the super-Poissonian regime of the photon- assisted electronic transport has a sharp peak in the region of the energy gap of the superconductor.

Tsvelykh A.N.,Ukrainian Academy of Sciences
Biology Bulletin | Year: 2016

Fossil remains of gannets were found during excavations in the port area of the ancient city of Chersonesus (Sevastopol) in the layers dating to the 5th and 10th centuries AD. Judging by the joint findings of gannet bones and those of other marine fish-eating diving birds, they had been captured in fishing nets, where they died while diving for fish. The species composition of the aquatic birds accompanying the findings of gannets suggests that gannets appeared on the northern coast of the Black Sea mainly during cold seasons. The distribution and number of findings of gannets in the northern Black Sea region indicates that these birds were widespread there. Gannets could have appeared in the Black Sea from the Mediterranean Sea penetrating there from the Atlantic Ocean during long eastward migrations. Gannets appeared in the fauna of the Black Sea no later than the 6th century BC and became extinct no earlier than the tenth century AD, probably surviving up until the 14th–15th centuries AD. © 2016, Pleiades Publishing, Inc.

Andriychuk M.,Ukrainian Academy of Sciences
2011 11th International Conference - The Experience of Designing and Application of CAD Systems in Microelectronics, CADSM 2011 | Year: 2011

A combination of asymptotic approach and computational modeling is used for solution of problem to investigate the backscattering of several small particles embedded in fluid medium. The initial diffraction problem of wave scattering by many small particles is developed under the assumption ka <<1, d >>a, where a is the size of the particles and d is the distance between the neighboring particles. On the wavelength one may have many small particles. Impedance boundary conditions are assumed on the boundaries of small particles. The results of numerical simulation show good agreement with the theory. A series of constructive conclusions on the basis of received numerical results open a way to engineering realization of measurement and search systems in the MEMS applications. © 2011 Lviv Polytechnic National.

Purpose. To perform a quantitative estimation of the personal characteristics of managers of coal mine divisions and to develop a methods for increasing their readiness for trouble-free work. methodology. A complex method of research with methods of mathematical modeling, system, factor, mathematical, and information analysis, mathematical statistics, probability theory, reliability theory, psychophysiology methods, engineering psychology with the use of statistical data on injuries and accidents. findings. The dependence of the deviations on the regulatory decisions in a series of professional training on the specific number of experienced managers was established; an exponential dependence of the growth of professional knowledge of managers on the amount of information that received in the course of professional training was found; conditions under which managers' emergency actions approach to being automatic were defined. The criterion of professional readiness of a team of managers to control work in areas in an accident-free mode was proposed and substantiated. The criterion is directly proportional to their self-discipline when issuing directives to subordinates and in monitoring performance, vigilance in the analysis of situations and inversely proportional to blenching safety work breaches. A direct correlation between the frequency of accidents and the criteria of professional readiness of the team of managers to work without accidents was established. Originality. For the first time, the relationship between personal psychophysiological characteristics of managers, their work experience, age and incidence of injuries at the mine as a result of emergency situations was defined. Practical value. Methods for increasing the readiness of managers of coal mine sections for accident-free work according to the quantitative estimation of their personal characteristics were developed. © Shevchenko V. G., 2016.

Gumenyuk A.F.,Ukrainian Academy of Sciences | Kerita O.A.,Ukrainian Academy of Sciences
Molecular Crystals and Liquid Crystals | Year: 2017

Studied an energy spectrum of traps in poly(di-n-hexylsilane) by fractional thermoluminescence. The spectrum is discrete, while the frequency factor is dispersed. It was found that this energies form three oscillatory series. Energy of the oscillatory quantum for each series coincides with the energy corresponding symmetrical Raman mode of the polymer silicon backbone. It is found that each oscillator series corresponds to a specific conformation of the silicon backbone. Model of traps was developed which adequately explain all observed thermoluminescent features of the material. © 2017 Taylor & Francis Group, LLC.

Linnik O.,Ukrainian Academy of Sciences | Nadtoka O.,Taras Shevchenko National University
Molecular Crystals and Liquid Crystals | Year: 2017

A significant improvement of photocatalytic efficiency is achieved by the synthesis of TiO2/SiO2 nanocomposites where silica matrix provides the transport of reagents to TiO2 nanoparticles via porous structure, generation of the new active sites and thermal stability. The semiconductive films contained 10 or 30% of TiO2 in silica matrix are synthesized by sol-gel method using concentrated anatase titania colloid. The complex composites consisted of i) the Acridine Yellow dye molecules and the polyepoxypropyl carbazole; ii) the azobenzene containing polymer covered onto the titania/silica films are obtained as photocatalytic materials. Photocatalytic activity of the composites is tested via the reduction of dichromate ions. © 2017 Taylor & Francis Group, LLC.

Nadtoka O.,Taras Shevchenko National University | Vertsimakha Y.,Ukrainian Academy of Sciences
Molecular Crystals and Liquid Crystals | Year: 2017

The influence of matrix material on optical and photovoltaic properties of nanocomposite dyes-containing films is analyzed. The H-aggregates of the polymethine dyes with different energies are formed in the films. The efficiency of charge-carrier photogeneration of some H-aggregates is higher than that of quasi-isolated dyes molecules. This results in an essential widening of the spectral region absorption and the photosensitivity to the region 1.6-2.0 eV. The energy maxima for H-aggregates weakly depend on the matrix molecular structure, whereas their photosensitivity maxima mainly depend on the dyes molecular structure. The effective charge carrier photogeneration and the photovoltage in these films in the region 2.0–3.0 eV are verified. © 2017 Taylor & Francis Group, LLC.

Berezovskyi O.A.,Ukrainian Academy of Sciences
Cybernetics and Systems Analysis | Year: 2016

The author analyzes the conditions of obtaining exact solutions to quadratic extremum problems of general type by using SDP-relaxations. Based on the known results for exactness of dual bounds (Lagrangian relaxations) and their relationship with SDP-relaxations, several conditions are formulated, under which the values of optimal objective function of the quadratic extremal problem and its SDP-relaxation are equal. © 2016, Springer Science+Business Media New York.

Hnativ L.O.,Ukrainian Academy of Sciences
Cybernetics and Systems Analysis | Year: 2016

A matrix method is considered to construct simple order-32 integer cosine step transform. A one-norm simple order-32 integer transform is proposed and its fast algorithms are developed whose computational complexity is 4.3 times smaller than that of well-known algorithms and 19 times smaller than that of the H.265 standard. © 2016, Springer Science+Business Media New York.

Sharaievskii G.,Ukrainian Academy of Sciences
Nuclear and Radiation Safety | Year: 2016

The paper presents validation of known calculation dependencies used in RELAP-5 and other advanced computer codes to predict thermohydraulic anomalies from the standpoint of analyzing effect of initial coolant boiling in the Chornobyl accident on its further progression. The authors show current unsatisfactory efficiency of state-of-the-art computer codes in definition of the initial boiling point for the coolant in water-cooled nuclear reactors. The calculation methodology for improving accuracy in the predicting of dangerous thermal anomaly in reactor channels is under consideration. © G. Sharaievskii, 2016.

Shalyapin V.N.,Ukrainian Academy of Sciences | Shalyapin V.N.,University of Cantabria | Goicoechea L.J.,University of Cantabria
Astrophysical Journal | Year: 2017

We analyze new optical observations of the gravitational lens system SDSS J1515+1511. These include a 2.6-year photometric monitoring with the Liverpool Telescope (LT) in the r band, as well as a spectroscopic follow-up with the LT and the Gran Telescopio Canarias (GTC). Our r-band LT light curves cover a quiescent microlensing period of the doubly imaged quasar at = 2.049, which permits us to robustly estimate the time delay between the two images A and B: 211 ± 5 days (1σ confidence interval; A is leading). Unfortunately, the main lensing galaxy (G1) is so faint and close to the bright quasar that it is not feasible to accurately extract its spectrum through the GTC data. However, assuming the putative redshift = 0.742, the GTC and LT spectra of the distant quasar are used to discuss the macrolens magnification, and the extinction and microlensing effects in G1. The new constraints on the time delay and macrolens magnification ratio essentially do not change previous findings on the mass scale of G1 and external shear, while the redshift of the lensing mass is found to be consistent with the assumed value of . This is clear evidence that G1 is indeed located at = 0.742. From the GTC data, we also obtain the redshift of two additional objects (the secondary galaxy G2 and a new absorption system) and discuss their possible roles in the lens scenario. © 2017. The American Astronomical Society. All rights reserved.

Namin S.M.,Islamic Azad University at Varamin | Korneyev S.V.,Ukrainian Academy of Sciences
Annales Zoologici | Year: 2017

Tephritis alamutensis sp. Nov. collected on flowerheads of Cousinia sp. cf. umbrosa (Asteraceae: Cardueae) in northern Iran is described. It is similar to T. ochroptera S. Korneyev, 2013, and T. afrostriata S. Korneyev, 2013 in body size and wing pattern coloration (yellowish body, pale wing pattern, cell r1 with two large spots and oviscape at least partly yellow), but differs from both species by the incised aculeus tip and setulose ventral side of vein R4+5, as well as details of the wing pattern. The new species is also compared with the superficially similar European species, T. vespertina (Loew, 1844). An improved key to species of Tephritis having the pale brown wing pattern is provided. © Museum and Institute of Zoology PAS.

Roshchupkin S.P.,Ukrainian Academy of Sciences
Conference Proceedings - 2016 IEEE 13th International Conference on Laser and Fiber-Optical Networks Modeling, LFNM 2016 | Year: 2016

The review on the quantum electrodynamics (QED) processes proceeding in strong pulsed light fields, realized in modern powerful pulsed lasers is presented. Resonant and coherent processes of quantum electrodynamics in strong laser fields are considered. Following QED processes in the pulsed laser field are considered: Resonant scattering of ultra relativistic electrons, resonance of exchange amplitude of a photon by an electron, parametric interference effect in electron-nucleus scattering in the field of two pulsed laser waves. It is demonstrated that the resonant cross sections may be several orders of magnitude greater than the corresponding cross sections in the absence of an external field. Results obtained may be experimentally verified, for example, by the scientific facilities at sources of pulsed laser radiation (SLAC, FAIR, XFEL, ELI, XCELS). © 2016 IEEE.

Peschansky V.G.,Ukrainian Academy of Sciences | Peschansky V.G.,University of Kharkiv
Low Temperature Physics | Year: 2017

This is a theoretical study of the response of an electron system to nonuniform heating of layered conductors with a quasi-two dimensional charge carrier energy spectrum near the Lifshitz electron topological transition when external interactions with the conductor, such as pressure, cause a change in the connectivity of the Fermi surface. With a variety of dispersion relations for the conduction electrons as examples, it is shown that there is a great variety of electronic topological transitions in layered conductors, which are accompanied by unusual magnetic field dependences of the kinetic coefficients. The migration of conduction electrons over different cavities (sheets) of the Fermi surface owing to magnetic breakdown is analyzed for close proximity of individual cavities of the Fermi surface. The dependence of the thermoelectric coefficients on the magnitude and orientation of strong magnetic fields B, such that the cyclotron frequency xc is much higher than the collision frequency 1/s of the conduction electrons, is calculated. An experimental study of these effects yields important information on the energy spectrum of the charge carriers.

Rode G.G.,Ukrainian Academy of Sciences
Ukrainian Journal of Physics | Year: 2017

Rules for the propagation of the error and mean value obtained for a measured physical quantity x onto another one, which is coupled to the former by means of the x2 or √x functional relation, have been derived. Those rules are inherently based on the Gaussian weight scheme, so that they should provide correct results in the framework of the latter with discrete data, which is typical of a real physical experiment (with samplings). The obtained analytical form that represents the mentioned rules (the “analytical propagation rules”) and their exact character allow the processing and analysis of experimental data to be simplified and accelerated. © G.G. RODE, 2017.

Kopeliovich A.I.,Ukrainian Academy of Sciences | Petrenko L.G.,University of Kharkiv
Low Temperature Physics | Year: 2017

A two-fluid hydrodynamic model is used to examine the electrical conductivity of collinear magnetic micro- and nanoconductors without the electric field screening typical of wires. It is shown that the transport properties of these wires are qualitatively different from the usual behavior. An electro-spin effect is predicted.

Shkilev V.P.,Ukrainian Academy of Sciences | Lobanov V.V.,Ukrainian Academy of Sciences
Russian Journal of Physical Chemistry A | Year: 2017

A new approach to constructing adsorption thermodynamics that provides the derivation of rigorous thermodynamic relationships for any adsorption system, particularly for a system with a deformable adsorbent, is proposed. Expressions for the thermodynamic functions of an adsorption system in the form of an arbitrary control volume containing the adsorbent and the adsorbed gas are derived. In the derived expressions, the role of adsorption is played by the total adsorbate content in the system. If the control volume boundaries are set appropriately, this quantity is identical to absolute adsorption. © 2017, Pleiades Publishing, Ltd.

Khristenko D.S.,Ukrainian Academy of Sciences | Kotovska G.O.,Ukrainian Academy of Sciences
Turkish Journal of Fisheries and Aquatic Sciences | Year: 2017

This study was conducted to determine length–weight relationships, condition factor (K) and relative condition factor (Kn) of freshwater bream Abramis brama (Linnaeus, 1758), inhabiting Kremenchug Reservoir (Middle Dnieper, Ukraine). Fishes aged from 0+ to 19+ were analysed. Length-weight relationships were found to be W=0.0094×SL3.2545 (R2=0.9882), W=0.0133×SL3.1318 (R2=0.9832), and W=0.0106×SL3.2098 (R2=0.9848) for females, males and combined sexes, respectively. A positive allometric growth (b>3) was observed for all samples. Calculation of average K resulted as 2.29 for females, 2.12 for males and 2.21 for all specimen. Average Kn of these groups were found to be 1.05, 0.98 and 1.01, respectively. This study is the first reference on LWR equation parameters and Kn of A. brama in the Dnieper River. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.

Verves Y.G.,Ukrainian Academy of Sciences | Radchenko V.G.,Ukrainian Academy of Sciences
Biologia (Poland) | Year: 2017

Sarcophaga disputata Lehrer, 1967 is a poorly known Central European species. A detailed redescription of the male with a morphological study of the genitalia using light and electron microscopy was carried out. A terminology of different structures of the phallosome of Sarcophagini is discussed. A hypothesis is proposed suggesting that specific areas near the base of the gonites, which are covered with numerous yellow microtrichiae, are important points of contact with the vaginal wall; and that juxtal lateral spaces with apical openings serve to guide the lateral styli during copulation. © 2017 Institute of Zoology, Slovak Academy of Sciences 2017.

Lysenko A.V.,Ukrainian Academy of Sciences
Journal of Superhard Materials | Year: 2017

Based on detailed models of interatomic cohesion and the well-developed structural-thermodynamic approach, the interatomic bond energy has been determined for some covalent and metallic crystals and it has been found to agree with experimental data. Using the proposed analytical relationship for the degree of covalency of crystals the author has elaborated a generalized model that describes experimental hardness of supersclerometer materials (diamond, cBN, SiC, and others), minerals, refractory compounds, semiconductors, ionic crystals and metals. On the basis of the mechanical-chemical approach to (nano)flow a dislocation model of crystal-mechanical anisotropy of yield strength has been put forward for monocrystalline diamond and lonsdaleite; the model makes it possible to draw a conclusion on a slight difference in their sclerometric characteristics. The experimental relationships that govern high-temperature high-pressure plasticity in some covalent crystals are discussed. © 2017, Allerton Press, Inc.

Bekenev V.L.,Ukrainian Academy of Sciences | Zubkova S.M.,Ukrainian Academy of Sciences
Semiconductors | Year: 2017

The atomic and electronic structure of four variants of Te-terminated CdTe(111)B–(2√3 × 4) orthogonal polar surface (ideal, relaxed, reconstructed, and reconstructed with subsequent relaxation) are calculated ab initio for the first time. The surface is modeled by a film composed of 12 atomic layers with a vacuum gap of ~16 Å in the layered superlattice approximation. To close Cd dangling bonds on the opposite side of the film, 24 fictitious hydrogen atoms with a charge of 1.5 electrons each are added. Ab initio calculations are performed using the Quantum Espresso program based on density functional theory. It is demonstrated that relaxation leads to splitting of the four upper layers. The band energy structures and total and layer-by-layer densities of electronic states for the four surface variants are calculated and analyzed. © 2017, Pleiades Publishing, Ltd.

Kolodnits'kyi V.M.,Ukrainian Academy of Sciences | Bagirov O.E.,SOCAR
Journal of Superhard Materials | Year: 2017

The publications on the studies of structures and properties of diamond-containing composites (diamond–(WC–Co), diamond–(Fe–Cu–Ni–Sn), diamond–(Co–Cu–Sn) and diamond–hard alloy plates used to produce tools for drilling oil and gas wells as well as stone-working tools have been analyzed. Particular attention has been given to the structure formation of the diamond–matrix transition zone, mechanical and operating properties of the composites. The promising lines of the development of the materials science of diamond-containing composites used in rock destruction tools have been defined. © 2017, Allerton Press, Inc.

Devin L.N.,Ukrainian Academy of Sciences | Rychev S.V.,Ukrainian Academy of Sciences
Journal of Superhard Materials | Year: 2017

The process of cutting of an aluminum alloy has been monitored by the acoustic emission method. Single-crystal natural and synthetic diamond tools have been used in the investigation. The comparative analysis has demonstrated that the correlation model of acoustic emission, which was put forward by Pan and Dornfeld, is valid for the conditions of fine diamond turning of aluminum alloys. © 2017, Allerton Press, Inc.

The paper describes, from the statistical standpoint, the mechanism of formation of spherical shape of the averaged cross section of scratches produced by flat faces of diamond grains in abrasive material of grinding wheels during their dressing with diamond rolls manufactured by electroforming. The distribution of parameters of orientation of diamond grain cutting faces has been determined and a brief comparative analysis of characteristics of dressing tools manufactured by electroforming and electroplating has been performed. A notion of the reduced effective diameter has been introduced into the model representation of a diamond cutting grain; a relationship between this diameter and the tool grain size has been found, which is needed for calculating individual and total cross-sections of cuts, dressing forces, and surface roughness of workpieces ground with pre-dressed abrasive wheels. © 2017, Allerton Press, Inc.

Sosnitskii S.P.,Ukrainian Academy of Sciences
Advances in Space Research | Year: 2017

We study the Lagrange stability in the planar restricted three-body problem. In particular, in the case of the circular restricted three-body problem, we prove a theorem on the Lagrange stability of the infinitesimal particle. A weaker version of this theorem can be obtained in the case of the elliptic restricted three-body problem. © 2017 COSPAR.

Tulyakova N.,Ukrainian Academy of Sciences
International Journal Bioautomation | Year: 2017

The locally adaptive myriad filters to suppress noise in electrocardiographic (ECG) signals in almost in real time are proposed. Statistical estimates of efficiency according to integral values of such criteria as mean square error (MSE) and signal-tonoise ratio (SNR) for the test ECG signals sampled at 400 Hz embedded in additive Gaussian noise with different values of variance are obtained. Comparative analysis of adaptive filters is carried out. High efficiency of ECG filtering and high quality of signal preservation are demonstrated. It is shown that locally adaptive myriad filters provide higher degree of suppressing additive Gaussian noise with possibility of real time implementation. © 2017 by the authors.

The paper gives theoretical substantiation of the phenomenon of a circular shape of a scratch cross-section averaged over a set of cuts produced by far-from-round tips of diamond grains of electroplated dressing tools that work on the abrasive material of grinding wheels. This cross-sectional shape is identified as an effective shape of the grain that produces the scratch. Information on the scratch parameters and their relationship with the diamond grain size in the tool is needed for calculating individual and total cross-sections of cuts, dressing forces, and surface roughness of workpieces upon grinding with abrasive wheels dressed by a diamond roll. © 2016, Allerton Press, Inc.

Kliushnychenko O.V.,Ukrainian Academy of Sciences | Lukyanets S.P.,Ukrainian Academy of Sciences
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2017

We examine how the short-range repulsive interaction in a gas of Brownian particles affects behavior of the nonequilibrium depletion forces between obstacles embedded into the gas flow. It is shown that for an ensemble of small and widely separated obstacles the dissipative wake-mediated interaction belongs to the type of induced dipole-dipole interaction governed by an anisotropic screened Coulomb-like potential. For closely located obstacles, formation of a common density perturbation "coat" around them leads to enhancement of dissipative interaction, manifested by characteristic peaks in its dependence on both the bath fraction and the external driving field. Moreover, additional screening of the gas flow due to nonlinear blockade effect gives rise to generation of a pronounced step-like profile of gas density distribution around the obstacles. This can lead to additional enhancement of dissipative interaction between obstacles. The possibility of the dissipative pairing effect and dissipative interaction switching provoked by wake inversion is briefly discussed. All the results are obtained within the classical lattice-gas model. © 2017 American Physical Society.

Burchinsky S.,Ukrainian Academy of Sciences
Psychiatry, Psychotherapy and Clinical Psychology | Year: 2016

In the present paper pharmacological and pharmacotherapeutic aspects of use of atypic antipsychotics have been analyzed. A main attention paid to one of the most popular drug of above mentioned group - risperidone. Advantages, possibilities and experience of use of risperidone in different clinical forms of schizophrenia have been looked. A main attention paid on the wide spectrum of clinical effects and on the safety of risperidone comparing with conventional antipsychotics as well as with other atypic's drugs. Expediency of choice of risperidone (Rostalept-Rota) as a first line drug in therapy of schizophrenia, mainly in strategy of relapse prophylaxis, and in gerontopsychiatry has been grounded.

Storozhenko S.Y.,Russian Academy of Sciences | Pushkar T.I.,Ukrainian Academy of Sciences
Annales Zoologici | Year: 2017

The monotypic genus Hancockitettix Storozhenko et Pushkar, gen. Nov. (type species Hancockitettix humeratus Storozhenko et Pushkar, sp. Nov.) from the Malay Peninsula is described. A new genus belongs to the subfamily Cladonotinae. It resembles the genera Hancockella Uvarov, 1940 from India and Austrohancockia Günther, 1938 from China, Taiwan, Japan and Vietnam in the general body appearance, in the large lobules on the upper and lower margins of the fore and mid femora, and in the relatively narrow scutellum, but differs from them by the presence of fully developed tegmen, hind wing and tegminal sinus, by the triangular plate-like projected shoulder of pronotum, and by the considerable distance between the most outstanding parts of shoulders which exceeds the pronotum lobe width (in other mentioned genera the hind wing and tegminal sinus are absent, the tegmen is absent or rudimentary, lateral side of shoulder is broadly rounded or obtusely angular, and the distance between shoulders is less than the pronotum lobe width). © Museum and Institute of Zoology PAS.

Balashov I.,Ukrainian Academy of Sciences | Kijashko P.,Russian Academy of Sciences
Journal of Conchology | Year: 2017

In the upper part of the Sophia River Valley near Arkhyz village (Northern Caucasus, Russia) at an altitude of 2000-3000m an unusual species composition of land snails was observed. The species composition hercioith reported is similar to that known from the Pleistocene of the East European Plain and consists of 14 species, including 3 extremely rare and with fragmented distributions: Vallonia tenuilabris, Zoogenetes harpa and Pupilla sterrii. Most of other species are common and widespread and only 2 of the 14 are Caucaisan ende?7iics. It suggests that this species composition originates from the Pleistocene malacofauna of the Ciscaucasia and adjacent territories of the East European Plain and the Sophia River Valley is a glacial refugium. The 56 collected specimens of P. sterrii are not quite usual -All their shells have no white callus that is normally present in this species and several specimens are toothless or have 3 teeth (normally 2 teeth are present).

Yemets A.I.,Ukrainian Academy of Sciences | Blume R.Y.,Taras Shevchenko National University | Sorochinsky B.V.,Ukrainian Academy of Sciences
Cytology and Genetics | Year: 2016

The most suitable plant indicator targets for radiation pollution biomonitoring are conifers, because they have high radiosensitivity. Previously accumulated information about the genetic nature of morphological abnormalities in gymnosperms, induced by acute and chronic irradiation in the exclusion zone of the Chernobyl nuclear power plant, are briefly considered in this review. Since an additional number of important research results appeared in the last decade that are dedicated to the analysis of molecular biological and molecular genetic effects of chronic irradiation on the coniferous plants growing in the exclusion zone of the Chernobyl disaster, all these data are also analyzed in the current review. © Allerton Press, Inc., 2016.

Tronko N.D.,Ukrainian Academy of Sciences | Pushkarev V.M.,Ukrainian Academy of Sciences
Cytology and Genetics | Year: 2016

The review presents data on the basic molecular genetic mechanisms of formation of papillary thyroid carcinoma. The participation of ionizing radiation in the cancer pathogenesis was analyzed. The role of tumor microenvironment, inflammation, and nuclear transcription factor NF-κB in the initiation and development of papillary thyroid carcinoma was shown. © Allerton Press, Inc., 2016.

Lyubarsky G.Y.,Moscow State University | Perkovsky E.E.,Ukrainian Academy of Sciences
Paleontological Journal | Year: 2017

Ennoticus mnemosynon gen. et sp. nov. is described from Upper Cretaceous (Santonian) Taimyr amber. The new genus belongs to the tribe Cryptophagini and seems similar to the extant genus Mnionomidius, but differs from it in the presence of femoral lines. The new genus is similar to the tribe Caenoscelini in the presence of femoral lines, but differs from it in the parallel-sided tibia and weakly serrated lateral border of the pronotum. The new taxon is the most ancient representative of Cryptophaginae with femoral lines, an important distinctive feature. © 2017, Pleiades Publishing, Ltd.

Matsnev I.V.,Ukrainian Academy of Sciences | Negriyko A.M.,Ukrainian Academy of Sciences
Proceedings of the International Conference on Advanced Optoelectronics and Lasers, CAOL | Year: 2016

To achieve the maximum output in single-frequency lasing mode it is necessary to minimize losses in the optical system for the output beam and to provide the optimal value of the frequency-selective feedback at the level, sufficient for stable single-frequency mode of operation. In this paper we investigate the scheme of an external cavity diode laser (ECDL) based on phase volume holographic grating (VHG). Angular and spectral selectivity of the holographic grating allows to adjust the feedback levels with low losses in the resonator and can be used to create single-frequency diode laser with high output power. Here the optimal parameters of VHG are estimated and the proposals on VHG design are developed. © 2016 IEEE.

Natarov D.M.,Ukrainian Academy of Sciences
Proceedings of the International Conference on Advanced Optoelectronics and Lasers, CAOL | Year: 2016

Considered is the two-dimensional (2-D) source-free problem of the H-polarized electromagnetic field in the presence of a silver circular nanotube coated with a concentric layer of active material and with a core of similar active material. We assume that the natural-mode frequency is real-valued and look for it together with the threshold value of material gain in the active regions. As a method, we use the separation of variables and examine numerically the characteristic equations for different azimuthal indices. We demonstrate that the considered nanotube laser can emit light on a number of modes of different nature including the hybrid surface plasmon (SP) modes, like nanowire laser considered in our previous works. © 2016 IEEE.

Byelobrov V.O.,Ukrainian Academy of Sciences
Proceedings of the International Conference on Advanced Optoelectronics and Lasers, CAOL | Year: 2016

One of fundamental problems of electro-magnetics is the scattering of a plane wave from a grating of infinite circular dielectric cylinders (wires). Lord Rayleigh was apparently one of the first researchers who formulated it in the XIX century. We consider the associated lasing eigenvalue problem and focus our attention on the asymptotic approximations of the eigenvalues for large values of the ratio of the grating period to the wire radius. Classification of the modes located near the Rayleigh anomalies is given. © 2016 IEEE.

Soskin M.S.,Ukrainian Academy of Sciences | Vasil'Ev V.I.,Ukrainian Academy of Sciences
Proceedings of the International Conference on Advanced Optoelectronics and Lasers, CAOL | Year: 2016

Singularities are realized in variety of physical systems from optics to the Bose-Einstein condensates [1]. Optical singularities (optical vortices, circularly polarized C points, etc.) possess quit new properties against classical optics with smooth wave fields. Their discovery [2, 3] and investigation has created appearance of the singular optics as a new rapidly developing chapter of modern optics [3 5], etc. Most of papers in singular optics are devoted to realization and investigation of static optical fields. Quit new phenomena and regularities are realized in the dynamic optical fields [6-7]. We have shown also that very important and quite unusual topological role in singular optics play umbilic points, where wavefront is locally spherical one and possess special morphology [4]. © 2016 IEEE.

Nalyvaychuk M.V.,Kharkiv Polytechnic Institute | Yatsenko V.O.,Ukrainian Academy of Sciences
Proceedings of the International Conference on Advanced Optoelectronics and Lasers, CAOL | Year: 2016

The objective of this paper is to substantiate, theoretically and experimentally, the possibility of the development and implementation of the competitive adaptive cryogenic sensitive element (SE) based on the magnetic levitation phenomenon, high-precision optical measurement of levitating probe mechanical coordinates, and methods of signal processing proposed. © 2016 IEEE.

Makarkin V.N.,Russian Academy of Sciences | Perkovsky E.E.,Ukrainian Academy of Sciences
Cretaceous Research | Year: 2017

Glaesoconis popovi sp. nov. (NeuropteraConiopterygidae) is described from Upper Cretaceous (Santonian) Taimyr amber of northern Siberia (Yantardakh locality). The new species may be distinguished from others in the genus by much smaller eyes and the shape of the terminal segment of the maxillary palpus. The generic affinity of Glaesoconis baliopteryx Engel, 2004 from the mid-Cretaceous Burmese amber needs confirmation. © 2017 Elsevier Ltd

Avramov K.,Ukrainian Academy of Sciences | Raimberdiyev T.,International Kazakh-Turkish University
Nonlinear Dynamics | Year: 2017

Nonlinear finite-DOF dynamical system is derived to describe the beam vibrations with transversal crack. The beam deflections are expanded by using the eigenmodes and contact parameter. The Galerkin method is applied to the partial differential equation, which describes the structure vibrations. Two- and three-DOF nonlinear dynamical systems with internal resonance are analyzed. The multiple scales method is used to investigate both the principle second resonance and the combination one. The resonance quasi-periodic and sub-harmonic motions are analyzed. The quasi-periodic motions are arisen due to the Neimark–Sacker bifurcation. © 2017 Springer Science+Business Media Dordrecht

Akulenko N.M.,Ukrainian Academy of Sciences
Vestnik Zoologii | Year: 2016

The article describes characteristic features of the hematopoiesis in mature and immature green frogs (Pelophylax esculentus complex). Quantitative differences in liver myelograms were insignificant. However, in a sample of mature animals numerous significant correlations between the number of pigment inclusions in the liver and indicators of erythropoiesis and myelopoiesis were observed. Those correlations were absent in the immature frogs. We concluded that aft er the frogs' breeding a lack of plastic resources, in particular, hemosiderin remains up to the hibernation. © by N. M. Akulenko 2017.

The present paper contains information on a new beaver colony discovered in the Chornyi mochar tract, which is located in the lowland part of Transcarpathia (= Zakarpattia Region). This rodent species disappeared from the territory of Transcarpathia most likely in the 18th century. Its first reappearance was recorded in 2003. Since, the Eurasian beaver has demonstrated a rapid expansion, primarily along the main rivers. The discovered by us colony allows to suggest that the beaver is continuing its dispersal, entering far into the main river's tributaries and other shallower water bodies. Consequently, we are witnessing not only the expansion of the species' geographical range, but also the enlargement of the number of habitat types occupied by the animal. The possibilities and supposed consequences of the species' further expansion within the tract are shown as well. © by Z. Barkasi 2017.

Dolinskaya I.V.,Ukrainian Academy of Sciences
Vestnik Zoologii | Year: 2016

A key for identification of 39 species from 20 genera of Ukrainian notodontid moths based on the the eggs is provided. Reliable diagnostic characters, which do not disappear with the injury of eggs or eggs preserved for a long time in alcohol were used. The characters as egg shape, egg and chorion colour, shape of gnawed holes in eggs before setting out of caterpillars, the type of oviposition and the chorionic sculpture are applied. Clear characters that are typical for the live eggs, which vary in the process of egg development are revealed. These are characters of egg colour and pattern. In the key such characters are kept by stable signs that do not disappear aft er eggs traumatizing. The key is illustrated in details with photographs made using a digital camera and scanning electron microscope. © by I. V. Dolinskaya 2017.

The following proofs of Goldfish more powerful reproductive potential are given: high individual and relative fecundity, adequate fractional spawning process resulting in numerous off spring, represented by different generations of hatchlings, little number of individuals not participating in reproduction, prevailing number of fish eggs in females' ovaries, larger fraction of impregnated roe. All the above mentioned factors allow claiming that the Prussian carp is being replaced due to its low replacement ability. Perhaps for that reason Carassius gibelio (Bloch, 1782) choose small isolated water bodies, where it makes small populations, backed up by successful spawning with a single male of crucian carp, Carassius carassius (Linnaeus, 1758). © 2016 S. V. Kokodiy, published by De Gruyter Open 2016.

Kudrenko S.A.,Ukrainian Academy of Sciences
Vestnik Zoologii | Year: 2016

The data about the community composition, number and biomass of amphipods in three gulfs of the North-Western Black Sea are presented. The amphipod communities of the gulfs of Yahorlyk, Karkinit, and Tendra were studied and the species composition was compared with the previously published data. For each particular gulf, the list of amphipod species was composed. The quantitative parameters of the amphipod communities in the studied localities in different years were described. © 2016 S. A. Kudrenko, published by De Gruyter Open 2016.

Belous E.P.,Ukrainian Academy of Sciences
International Journal on Algae | Year: 2016

Investigations for the study of phytoplankton on the lower portion of the Southern Bug River were conducted in 2013–2014. According to the results of original studies, species richness in this section of the river is 210 species, represented by 219 taxa (infraspecific taxa). The basis of the phytoplankton taxonomic structure are formed by representatives of divisions Chlorophyta (42.4%), Bacillariophyta (32.9%), Cyanoprokaryota (10.5%) and Euglenophyta (5.7%). Main genera are Desmodesmus, Navicula, Euglena, Nitzschia, Coelastrum, Phacus, Acutodesmus, Monoraphidium, Oocystis and Cyclotella. According to the generalized data (including information from literature (1941–2004) and results of our investigations (2013–2014), phytoplankton of lower portion of the river is formed by 332 species (365 infr. taxa) from 10 divisions. Basis of species composition constitute Bacillariophyta – 143 species (157 infr. taxa) or 43.1% from total amount of registered taxons of species rank, Chlorophyta – 99 species (111 infr. taxa) or 29.8%, yanoprokaryota – 34 species or 10.2% and Euglenophyta – 28 species (33 infr. taxa) or 8.4%. Less diverse were such divisions as Charophyta – 11 species (12 infr. taxa) or 3.3%, Dinophyta – 8 species (9 infr. taxa) or 2.4%, Xanthophyta– 4 species or 1.2%, Chrysophyta – 3 species or 0.9%, Cryptophyta and Raphidophyta by one species or 0.3%. The composition and taxonomic structure of algae identified in the plankton were analyzed in order to determine changes occurring at present and their comparison with the earlier stage of development of the river. Comparison of original and literature data indicates a shift in the dominant set of taxonomic groups from diatom to green algae. Evidently, it is caused by changes in the hydrological regime of the watercourse – the flow rate, the trophic level and the like, as a result of anthropogenic pressure on this stretch of the river channel and a number of other factors. To interesting floristic findings of the lower portion of the river can be attributed to Aulacoseira subarctica (O. Müll.) E.Y. Haw., Cyclotella meduanae Germ., Navicula heimansioides Lange-Bert. and Phormidium regelii (Skuja) Anagn. et Komárek. ©Begell House Inc., 2016.

Borisova E.V.,Ukrainian Academy of Sciences
International Journal on Algae | Year: 2016

The flora of Charales of Ukraine was analyzed in terms of it taxonomic structure, ecological peculiarities, and geographical distribution. A total of 40 species were revealed belonging to Chara L. (24), Lamprothamnium J. Groves (1), Lychnothamnus (Rupr.) Leonh. emend. A. Braun (1), Nitella C. Agardh (9), Nitellopsis Hy (1), and Tolypella (A. Braun) A. Braun (4). Zonal differentiation in the distribution of genera and species of Charales was shown. Genera Chara and Nitella form the basis of the flora; the ratio of their species differs depending on physiographic regions of Ukraine. Each region has a peculiar complex of the most frequent species. In Ukrainian Polissia the most common species are Chara globularis Thuill. and Nitella flexelis (L.) C. Agardh. C. vulgaris L., C. globularis, and C. virgata Kütz. are typical for the zone of deciduous forests. Chara vulgaris, C. globularis, and N. mucronata (A. Braun) Miq. in H.C. Hall are widely distributed in the Forest-Steppe zone. Chara canescens Desv. et Loisel. in Loisel., C. hispida L., C. vulgaris, and Nitellopsis obtusa (Desv. in Loisel.) J. Groves are common in the steppe region. C. intermedia A. Braun and Laprothamnium papulosum (Wallr.) J. Groves frequently occur in the Ukrainian coastal waters of the Sea of Azov and the Black Sea. The effect of ecological and anthropogenic factors on species diversity and zonal distribution of Charales were shown. The geographic analysis of the Charales flora of Ukraine using the geographic elements developed for non-vascular plants showed its borealnemoral nature. ©Begell House Inc., 2016.

Springtails of the principalis-group of the genus Pygmarrhopalites from the W Caucasian caves in Abkhazia are de-scribed: Pygmarrhopalites dbari sp. nov. from Psyrtskha Cave in Novy Afon and Pygmarrhopalites kovali sp. nov. from caves of Tsebelda Karst Massif. They differ from epigean relatives mainly by troglomorphies: reduced pigmentation, elon-gated appendages and modified foot complex. These new species as well as a great portion of endemic Caucasian speleo-fauna have highly restricted distribution and require protection. A new record of Arrhopalites abchasicus Vargovitsh, 2013 in Novoafonskaya Cave is added. Copyright © 2017 Magnolia Press.

Mosyakin S.L.,Ukrainian Academy of Sciences | Shiyan N.M.,Ukrainian Academy of Sciences
Phytotaxa | Year: 2017

A nomenclatural overview of the genus Sibbaldianthe (Rosaceae, tribe Potentilleae) is provided, following the recent re-circumscription of genera in subtribe Fragariinae based on molecular phylogenetic and morphological evidence. It is demonstrated that the names Potentilla orientalis and P. semiglabra were in fact published by Yuzepchuk (Juzepczuk) without Latin descriptions in 1935, not in 1934; thus, these names and the combinations based on them are invalid. New combinations are validated: Sibbaldianthe subg. Schistophyllidium (Potentilla subg. Schistophyllidium); Sibbaldianthe imbricata (Potentilla imbricata), S. moorcroftii (P. moorcroftii), S. orientalis (Schistophyllidium bifurcum subsp. orientale, P. orientalis, nom. inval.), and S. semiglabra (Schistophyllidium bifurcum subsp. semiglabrum, P. semiglabra, nom. inval.). Nomenclature, distribution patterns, and data on chromosome numbers of all recognized taxa are discussed. Lectotypes of four names are designated; data on types of other names are provided when available. As currently outlined, the genus Sibbaldianthe contains seven species: two (S. adpressa and S. sericea) in subg. Sibbaldianthe and five in subg. Schistophyllidium. © 2017 Magnolia Press.

Cherniha R.,Ukrainian Academy of Sciences | Didovych M.,Ukrainian Academy of Sciences
Symmetry | Year: 2017

A simplified Keller-Segel model is studied by means of Lie symmetry based approaches. It is shown that a (1 + 2)-dimensional Keller-Segel type system, together with the correctly-specified boundary and/or initial conditions, is invariant with respect to infinite-dimensional Lie algebras. A Lie symmetry classification of the Cauchy problem depending on the initial profile form is presented. The Lie symmetries obtained are used for reduction of the Cauchy problem to that of (1 + 1)-dimensional. Exact solutions of some (1 + 1)-dimensional problems are constructed. In particular, we have proved that the Cauchy problem for the (1 + 1)-dimensional simplified Keller-Segel system can be linearized and solved in an explicit form. Moreover, additional biologically motivated restrictions were established in order to obtain a unique solution. The Lie symmetry classification of the (1 + 2)-dimensional Neumann problem for the simplified Keller-Segel system is derived. Because Lie symmetry of boundary-value problems depends essentially on geometry of the domain, which the problem is formulated for, all realistic (from applicability point of view) domains were examined. Reduction of the the Neumann problem on a strip is derived using the symmetries obtained. As a result, an exact solution of a nonlinear two-dimensional Neumann problem on a finite interval was found. © 2017 by the authors.

Kosenkov V.M.,Ukrainian Academy of Sciences
Surface Engineering and Applied Electrochemistry | Year: 2017

The process of the conversion of capacitor bank energy as a result of a high-voltage electrical discharge in water that fills a closed discharge chamber into the plasma, liquid, and solid energy is studied. Mathematical modeling in a coupled geometrically and physically nonlinear statement of electrodynamic, hydrodynamic, and elastic–plastic wave processes in the discharge chamber is used as the main research method. We determine the distribution of the capacitor bank energy transferred into a plasma, liquid, and solid body through their contact boundaries in accordance with the parameters of the dynamic system. © 2017, Allerton Press, Inc.

Pekar G.S.,Ukrainian Academy of Sciences | Singaevsky A.F.,Ukrainian Academy of Sciences
Materials Science in Semiconductor Processing | Year: 2017

By studying the drift of Na+ions in the firstly grown Na-doped bulk Ge crystals as well as by analyzing optical and some other characteristics of this material, the following conclusions are made, many of which are different from the commonly accepted statements: (1) Ge can be uniformly doped with Na during the bulk Ge crystals growth from the melt; (2) maximum solubility at room temperature and distribution coefficient of Na in Ge are (0.3–1)×1015 cm−3and (0.7–2.3)×10−7, respectively; (3) Na is a donor impurity in bulk Ge, and Na atoms introduced during the crystal growth are predominantly electrically active; (4) the evaluated values of diffusion parameters of Na in Ge are as follows: the diffusion coefficient D=3.6×10−7 cm2/s, pre-exponential factor D0=0.13 cm2/s, the activation energy for diffusion Q=0.33 eV; (5) Na is an interstitial impurity in Ge and rather rapidly drifts in an electric field, most likely, via interstitial sites; (6) the resistance distribution along the crystal length may be changed by DC electric field application and remain stable at the long-term crystal storage. The stability in the Ge:Na properties opens the possibility for using Ge:Na crystals not only for creating passive optical elements of infrared imaging technique, as we are doing now, but also for the electrical appliances, in particular for the substitution of the thermally unstable Li for Na in germanium detectors of γ-radiation. © 2017 Elsevier Ltd

Kushch V.I.,Ukrainian Academy of Sciences
International Journal of Engineering Science | Year: 2017

The complete series solution has been obtained for the potential field of an array of ellipsoidal inhomogeneities regarded as a multi particle model of composite. By combining the superposition principle, the perturbation field expansion in terms of ellipsoidal harmonics and the re-expansion formulas for them, the model boundary value problem is reduced to a set of linear algebraic equations. The obtained solution has been implemented in the modified Maxwell and Ralyeigh homogenization schemes for effective conductivity of ellipsoidal particle composite with an adequate account for the interaction effects. The results of numerical study are provided which illustrate the convergence rate of solution and accuracy of the developed method. © 2017 Elsevier Ltd

Fal' O.M.,Ukrainian Academy of Sciences
Cybernetics and Systems Analysis | Year: 2017

The author overviews the international standards developed by SC 27 “IT Security techniques” of the ISO/IEC Joint Technical Committee “Information technologies.” The standards include cryptographic mechanisms, evaluation and testing of products and information systems, countermeasures, and security services. Both published standards and those under development are considered. © 2017 Springer Science+Business Media New York

Based on the set-theoretic approach, a formal model is proposed for the synthesized screen image of a dynamic situation in areas of monitoring mobile objects. The essence of the model lies in varying the description of sets of aggregated static and dynamic objects that form the information filling of an adaptive dynamic scene with allowance made for the context of a given object domain. An algorithm is developed for layerwise visualization of the contextual cartographical background with the use of the types of cartographical objects that are singled out in the model. The model is implemented in a web-oriented geoinformation system of monitoring mobile objects that operates according to the MVC concept and has a client-server architecture. To implement it, the following complex of modern web technologies is used: PHP and MySQL on the server side and AJAX and jQuery on the client side. The module of addition/elimination of information on moving objects in a dynamic scene interacts with Google Maps Web Services without creating critical loads on the server side of the system. © 2017 Springer Science+Business Media New York

A brief analysis of the existing methods for controlling the operating conditions of the turbine units that operate at variable loads is presented. In practice, the outdated rule of operation is most frequently used that states that the higher the parameters of the live and reheat steam and the lower the condenser pressure are, the higher is the efficiency of the turbine unit. However, in the technical literature, there is sufficiently substantiated evidence that this approach is not always correct, especially under low loads. This applies to both the regulation of the initial and final pressure and reheat temperature tr. In the article, particular stress is laid on the controllable parameter tr, the effect of which in the operational practices, according to the results of the analysis, is underestimated. The causes are considered that constrain more effective use of reheat temperature tr as a process variable. The results of field trials to investigate the influence of tr on the efficiency of turbine units of various capacities, viz., of 210, 250, 300, and 325 MW, during operation at varying loads are presented. It is shown that a decrease in tr to an optimal value of 10–30°C, depending on the load and the condenser pressure, increases the thermal efficiency by 1–2%. The following general pattern has been set: the lower the load, the lower the optimal reheat temperature. The main causes and factors that result in more efficient use of the heat phase transition in the steam path of the low-pressure cylinder and increased efficiency of the unit under rational choice of the reheat temperature are studied. © 2017, Pleiades Publishing, Inc.

Panov A.,Ukrainian Academy of Sciences | Ponomarenko S.,State Research Institute of Aviation
2016 IEEE 4th International Conference Methods and Systems of Navigation and Motion Control, MSNMC 2016 - Proceedings | Year: 2016

The article considers the nonclassical quaternions and pentanions of helf-rotations of solid body and their application in problems of control and orientation of moving objects. In contrast to classical rationed Hamiltonian quaternions of complete rotations the nonclassical quaternions of helf-rotations may be null, they have variable rates, depending on the angle of Euler finite rotation. © 2016 IEEE.

Larin V.B.,Ukrainian Academy of Sciences | Tunik A.A.,National Aviation University
2016 IEEE 4th International Conference Methods and Systems of Navigation and Motion Control, MSNMC 2016 - Proceedings | Year: 2016

The problem of the synthesis of the advanced algorithms for quad-rotor horizontal flight control is considered. The modified procedure of the linear quadratic synthesis is applied. Two kinds of algorithms are considered here. The control goal in the 1st case is the achieving the certain point in the given navigation frame, meanwhile for the 2nd case the control goal is the stabilization of the cruise speed. Represented examples prove the efficiency of both kinds of algorithms. © 2016 IEEE.

Omel'Chenko O.E.,Weierstrass Institute for Applied Analysis And Stochastics | Omel'Chenko O.E.,Ukrainian Academy of Sciences | Wolfrum M.,Weierstrass Institute for Applied Analysis And Stochastics | Maistrenko Y.L.,Ukrainian Academy of Sciences
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2010

Chimera states are a recently new discovered dynamical phenomenon that appears in arrays of nonlocally coupled oscillators and displays a spatial pattern of coherent and incoherent regions. We report here an additional feature of this dynamical regime: an irregular motion of the position of the coherent and incoherent regions, i.e., we reveal the nature of the chimera as a spatiotemporal pattern with a regular macroscopic pattern in space, and an irregular motion in time. This motion is a finite-size effect that is not observed in the thermodynamic limit. We show that on a large time scale, it can be described as a Brownian motion. We provide a detailed study of its dependence on the number of oscillators N and the parameters of the system. © 2010 The American Physical Society.

Wu P.-C.,National Chiao Tung University | Lisetski L.N.,Ukrainian Academy of Sciences | Lee W.,National Chiao Tung University
Optics Express | Year: 2015

We focus on investigating the dielectric behaviors and the lowfrequency texture transitions in a cholesteric liquid crystal (CLC) doped with graphene nanoplatelets (GNPs) by means of dielectric spectroscopy and measurements of electro-optical responses. The experimental results indicate that incorporating GNPs at a content of 0.5 wt% into the CLC leads to significant suppression of ionic behaviors, as manifested by the reduction in ionic density, diffusivity, and relaxation frequency. In addition, the electro-optical properties of the GNP-doped CLC cell show the lowered operation voltage for the switching from the planar to focal conic state and the absence of the low-frequency focal-conic-to-uniform-lying-helix texture transition. Such results are attributable to the effects of GNPs as nuclei in the CLC medium, giving rise to the repression of the ionic and electrohydrodynamic effects. © 2015 Optical Society of America.

Sieber J.,University of Exeter | Omel'Chenko O.E.,Weierstrass Institute for Applied Analysis And Stochastics | Omel'Chenko O.E.,Ukrainian Academy of Sciences | Wolfrum M.,Weierstrass Institute for Applied Analysis And Stochastics
Physical Review Letters | Year: 2014

We present a control scheme that is able to find and stabilize an unstable chaotic regime in a system with a large number of interacting particles. This allows us to track a high dimensional chaotic attractor through a bifurcation where it loses its attractivity. Similar to classical delayed feedback control, the scheme is noninvasive, however only in an appropriately relaxed sense considering the chaotic regime as a statistical equilibrium displaying random fluctuations as a finite size effect. We demonstrate the control scheme for so-called chimera states, which are coherence-incoherence patterns in coupled oscillator systems. The control makes chimera states observable close to coherence, for small numbers of oscillators, and for random initial conditions. © 2014 American Physical Society.

Abadias G.,CNRS Pprime Institute | Ivashchenko V.I.,Ukrainian Academy of Sciences | Belliard L.,University Pierre and Marie Curie | Djemia P.,University of Paris 13
Acta Materialia | Year: 2012

The composition-dependence of the structure and elastic properties of ternary Ti 1-xZr xN alloys is systematically investigated by combining thin film growth and ab initio calculations. Single-phase Ti 1-xZr xN thin films (0 ≤ x ≤ 1) with a rocksalt structure have been deposited using dc reactive magnetron sputtering at T s = 300 °C in Ar/N 2 plasma discharges. The structure, stress state and phase stability upon thermal annealing were studied by X-ray diffraction (XRD), while the acoustic and elastic properties were measured using Brillouin light spectroscopy, picosecond ultrasonics and nanoindentation. First-principles pseudopotential calculations of the total energy, lattice constants, bulk modulus, and single-crystal elastic constants C ij for several cubic ordered structures of Ti 1-xZr xN alloys were also carried out. The positive values of the computed formation energies indicate that the homogeneous Ti 1-xZr xN alloys can be only stabilized at high temperatures. However, the magnetron-sputtered thin films were found to retain their as-grown single-phase cubic structure during post-deposition annealing at 850 °C for 3 h. The calculated equilibrium lattice parameters are in good agreement with the stress-free lattice parameters a 0 determined experimentally from XRD using the sin 2ψ method: they both exhibit a positive deviation from Vegard-like linear interpolation. The calculated bulk modulus, elastic constants and Poisson's ratio gradually decrease from TiN to ZrN. These computed values were used to interpret the experimentally derived elastic constants and Young's modulus as functions of composition. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Kryzhanivs'kyi E.I.,Ivano Frankivsk National Technical University of Oil and Gas | Nykyforchyn H.M.,Ukrainian Academy of Sciences
Materials Science | Year: 2011

We analyze general regularities of degradation of the mechanical and corrosion-mechanical properties of steels of oil and gas main pipelines and oil storage reservoirs after 28-40 years of operation. The transported oil product not only causes corrosion damages of the internal surface of pipelines and reservoirs, but also becomes a source of hydrogenation of the metal. As a result, it degrades already under the long joint action of mechanical load and hydrogen. Changes in (degradation of) the mechanical properties of the sections of a pipe or a reservoir that contact with the transported medium during operation indicate this fact. First of all, this manifests itself as embrittlement of the metal, i.e., as decreases in the plasticity and resistance to fracture. Comparison assessment of operated and nonoperated steels showed the high sensitivity of the electrochemical properties to the state of the metal, which offers prospects for the development of electrochemical methods for assessing its in-service degradation. © 2011 Springer Science+Business Media, Inc.

Maksymovych P.,Oak Ridge National Laboratory | Morozovska A.N.,Ukrainian Academy of Sciences | Yu P.,University of California at Berkeley | Eliseev E.A.,Ukrainian Academy of Sciences | And 5 more authors.
Nano Letters | Year: 2012

Metallic conductance in charged ferroelectric domain walls was predicted more than 40 years ago as the first example of an electronically active homointerface in a nonconductive material. Despite decades of research on oxide interfaces and ferroic systems, the metal-insulator transition induced solely by polarization charges without any additional chemical modification has consistently eluded the experimental realm. Here we show that a localized insulator-metal transition can be repeatedly induced within an insulating ferroelectric lead-zirconate titanate, merely by switching its polarization at the nanoscale. This surprising effect is traced to tilted boundaries of ferroelectric nanodomains, that act as localized homointerfaces within the perovskite lattice, with inherently tunable carrier density. Metallic conductance is unique to nanodomains, while the conductivity of extended domain walls and domain surfaces is thermally activated. Foreseeing future applications, we demonstrate that a continuum of nonvolatile metallic states across decades of conductance can be encoded in the size of ferroelectric nanodomains using electric field. © 2011 American Chemical Society.

Glamazda A.Y.,Ukrainian Academy of Sciences | Karachevtsev V.A.,Ukrainian Academy of Sciences | Euler W.B.,University of Rhode Island | Levitsky I.A.,University of Rhode Island | Levitsky I.A.,Emitech, Inc
Advanced Functional Materials | Year: 2012

An anisotropic carbon nanotube (CNT)-polymer composite for bolometric applications in the mid-IR spectral range (2.5-20 μm) is studied. Composite alignment in conjunction with non-uniform distribution of CNTs in the polymer matrix allows for a significant enhancement of the temperature coefficient of resistance (0.82% K -1) with respect to uniform composite (0.24% K -1). As a result a responsivity of ≈ 500 V W -1 is reached, which is the highest for CNT-based bolometers reported to date. Such remarkable optical and thermal characteristics are explained in terms of fluctuation tunneling theory taking into account the composite anisotropy and the gradient of the CNT concentration. Flatness of the photoresponse in the broad spectral mid-IR range and enhanced responsivity provide a great potential for the use of such novel composite for applications in IR spectroscopy and thermal imaging. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Girnyk T.,Weierstrass Institute for Applied Analysis And Stochastics | Hasler M.,Ecole Polytechnique Federale de Lausanne | Maistrenko Y.,Ukrainian Academy of Sciences
Chaos | Year: 2012

A ring of N identical phase oscillators with interactions between L-nearest neighbors is considered, where L ranges from 1 (local coupling) to N/2 (global coupling). The coupling function is a simple sinusoid, as in the Kuramoto model, but with a minus sign which has a profound influence on its behavior. Without the limitation of the generality, the frequency of the free-running oscillators can be set to zero. The resulting system is of gradient type, and therefore, all its solutions converge to an equilibrium point. All so-called q-twisted states, where the phase difference between neighboring oscillators on the ring is 2πq/N, are equilibrium points, where q is an integer. Their stability in the limit N → ∞ is discussed along the line of Wiley et al. [Chaos 16, 015103 (2006)] In addition, we prove that when a twisted state is asymptotically stable for the infinite system, it is also asymptotically stable for sufficiently large N. Note that for smaller N, the same q-twisted states may become unstable and other q-twisted states may become stable. Finally, the existence of additional equilibrium states, called here multi-twisted states, is shown by numerical simulation. The phase difference between neighboring oscillators is approximately 2πq/N in one sector of the ring, -2πq/N in another sector, and it has intermediate values between the two sectors. Our numerical investigation suggests that the number of different stable multi-twisted states grows exponentially as N → ∞. It is possible to interpret the equilibrium points of the coupled phase oscillator network as trajectories of a discrete-time translational dynamical system where the space-variable (position on the ring) plays the role of time. The q-twisted states are then fixed points, and the multi-twisted states are periodic solutions of period N that are close to a heteroclinic cycle. Due to the apparently exponentially fast growing number of such stable periodic solutions, the system shows spatial chaos as N → ∞. © 2012 American Institute of Physics.

Guz A.N.,Ukrainian Academy of Sciences
Engineering Analysis with Boundary Elements | Year: 2011

The frictionless contact interaction of the finite crack edges in an infinite plane is studied for the case of normal incidence of two harmonic tensioncompression waves with multiple mode-shifted frequencies. Boundary integral equation method and constrained optimization algorithm are used for the problem solution. Distribution of the forces of contact interaction and displacement discontinuity in space and time are analyzed. Influence of the wave frequencies on the stress intensity factor for different normalized wave numbers is considered here. © 2010 Elsevier Ltd. All rights reserved.

Omel'chenko O.E.,Weierstrass Institute for Applied Analysis And Stochastics | Omel'chenko O.E.,Ukrainian Academy of Sciences
Nonlinearity | Year: 2013

We consider a paradigmatic spatially extended model of non-locally coupled phase oscillators which are uniformly distributed within a one-dimensional interval and interact depending on the distance between their sites' modulo periodic boundary conditions. This model can display peculiar spatio-temporal patterns consisting of alternating patches with synchronized (coherent) or irregular (incoherent) oscillator dynamics, hence the name coherence-incoherence pattern, or chimera state. For such patterns we formulate a general bifurcation analysis scheme based on a hierarchy of continuum limit equations. This provides the possibility of classifying known coherence-incoherence patterns and of suggesting directions for the search for new ones. © 2013 IOP Publishing Ltd & London Mathematical Society.

Wolfrum M.,Weierstrass Institute for Applied Analysis And Stochastics | Omel'Chenko O.E.,Weierstrass Institute for Applied Analysis And Stochastics | Omel'Chenko O.E.,Ukrainian Academy of Sciences
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2011

Spatiotemporal chaos and turbulence are universal concepts for the explanation of irregular behavior in various physical systems. Recently, a remarkable new phenomenon, called "chimera states," has been described, where in a spatially homogeneous system, regions of irregular incoherent motion coexist with regular synchronized motion, forming a self-organized pattern in a population of nonlocally coupled oscillators. Whereas most previous studies of chimera states focused their attention on the case of large numbers of oscillators employing the thermodynamic limit of infinitely many oscillators, here we investigate the properties of chimera states in populations of finite size using concepts from deterministic chaos. Our calculations of the Lyapunov spectrum show that the incoherent motion, which is described in the thermodynamic limit as a stationary behavior, in finite size systems appears as weak spatially extensive chaos. Moreover, for sufficiently small populations the chimera states reveal their transient nature: after a certain time span we observe a sudden collapse of the chimera pattern and a transition to the completely coherent state. Our results indicate that chimera states can be considered as chaotic transients, showing the same properties as type-II supertransients in coupled map lattices. © 2011 American Physical Society.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: ENV.2008. | Award Amount: 4.67M | Year: 2009

Hypoxic (low oxygen) conditions in aquatic ecosystems increase in number, duration and extent due to global warming and eutrophication. Global warming will lead to degassing of oxygen, increased stratification, reduced deep-water circulation and changes in wind patterns affecting transport and mixing. Projected increases in hypoxia (e.g. doubling of dead zones) are accompanied by enhanced emission of greenhouse gases, losses in biodiversity, ecosystem functions and services such as fisheries, aquaculture and tourism. A better understanding of global changes in oxygen depletion requires a global observation system continuously monitoring oxygen at high resolution, including assessment of the role of the seafloor in controlling the sensitivity of aquatic systems to and recovery from hypoxia. Here we propose to monitor oxygen depletion and associated processes in aquatic systems that differ in oxygen status or sensitivity towards change: open ocean, oxic with high sensitivity to global warming (Arctic), semi-enclosed with permanent anoxia (Black Sea, Baltic Sea) and seasonally or locally anoxic land-locked systems (fjords, lagoons, lakes) subject to eutrophication. We will improve the capacity to monitor oxygen depletion globally, by implementing reliable long-term sensors to different platforms for in situ monitoring; and locally by training and implementing competence around the Black Sea. Our work will contribute to GEOSS tasks in the water, climate, ecosystem and biodiversity work plans, and comply to GEOSS standards by sharing of observations and products with common standards and adaptation to user needs using a state of the art world data centre. We will connect this project to the GOOS Regional Alliances and the SCOR working group and disseminate our knowledge to local, regional and global organisations concerned with water and ecosystem health and management.

Agency: European Commission | Branch: H2020 | Program: ERA-NET-Cofund | Phase: SC5-15-2015 | Award Amount: 52.36M | Year: 2016

In the last decade a significant number of projects and programmes in different domains of environmental monitoring and Earth observation have generated a substantial amount of data and knowledge on different aspects related to environmental quality and sustainability. Big data generated by in-situ or satellite platforms are being collected and archived with a plethora of systems and instruments making difficult the sharing of data and knowledge to stakeholders and policy makers for supporting key economic and societal sectors. The overarching goal of ERA-PLANET is to strengthen the European Research Area in the domain of Earth Observation in coherence with the European participation to Group on Earth Observation (GEO) and the Copernicus. The expected impact is to strengthen the European leadership within the forthcoming GEO 2015-2025 Work Plan. ERA-PLANET will reinforce the interface with user communities, whose needs the Global Earth Observation System of Systems (GEOSS) intends to address. It will provide more accurate, comprehensive and authoritative information to policy and decision-makers in key societal benefit areas, such as Smart cities and Resilient societies; Resource efficiency and Environmental management; Global changes and Environmental treaties; Polar areas and Natural resources. ERA-PLANET will provide advanced decision support tools and technologies aimed to better monitor our global environment and share the information and knowledge in different domain of Earth Observation.

Agency: European Commission | Branch: FP7 | Program: CSA-SA | Phase: INCO.2010-6.1 | Award Amount: 600.70K | Year: 2010

The 36-months SUCCESS project is based on a twinning approach between one of the leading Ukrainian scientific and educational organisations, the Institute for Scintillation Materials of Academy of Science of Ukraine (ISMA), with their long term partner University Claude Bernard of Lyon (UCBL). The project gives Ukraine the possibility to improve the research activities of their highest quality in the FP7 thematic priority Nanosciences, nanotechnologies, materials & new production technologies (NMP), and in particular in the field of Material Sciences. SUCCESS include several main types of activities, thus forming a coherent plan for improving the ISMA capacities in a number of fields relevant to the FP7 Thematic Priority NMP: (1) Preparatory and analytical activities: preparation of ISMA Strategic Development Plan based on ISMA SWOT analysis and socio-economic analysis on Ukraine, Eastern Europe and EU level; (2) Twinning activities, based on the twinning and joint research plan to be prepared and implemented jointly by ISMA and UCBL, and linked to the Strategic Development Plan of ISMA. This activity includes, for example, exchange of researchers and young specialists, organisation of joint scientific workshops, set up of joint research experiments in EU, feasibility study of a joint virtual laboratory ISMA-UCBL and first implementation steps. Sustainability plan will be designed and implemented. (3) International cooperation activities, such as networking & brokerage, ETP and FP7 consortia integration etc, which will be implemented on wide European and regional level, involving other European organisations, thus extending the project impact. (4) Training and coaching activities, that will aim to increase the ISMA understanding of FP7, build competences and enhance the Institutes participation in FP7. Four peer reviews will be organised by the high level S&T specialists, selected according to a transparent procedure.

Agency: European Commission | Branch: FP7 | Program: CSA | Phase: ICT-2007.9.2 | Award Amount: 824.55K | Year: 2009

EU, Belarus and Ukraine face common ICT R&D opportunities and challenges that create a favourable environment for strategic collaboration. The main aim of SCUBE-ICT is to increase co-operation between ICT researchers from the three regions. The project will achieve its overall aim via a range of activities: 1. Assessing the ICT collaboration potential for the three regions. This involves production of a White Paper on ICT R&D in Belarus and Ukraine; mapping the Belarusian and Ukrainian ICT actors; reporting on opportunities for Bel/Ukr ICT actors in the EU; and reporting on opportunities for EU ICT actors in Bel/Ukr; 2. Organising awareness-raising and training events about the ECs ICT R&D programmes for Bel/Ukr ICT actors. Also, organising networking/partnership events with motivated EU and Bel/Ukr ICT actors to initiate research collaborations between them; 3. Providing advanced support services to competent Bel/Ukr ICT actors to build long-term relationships with key EU counterparts. Central to this will be implementation of Joint Action Plans, which are mini roadmaps describing in detail how to reach research collaboration goals; 4. Enhancing ICT R&D policy dialogue between policy makers and stakeholders from EU and Bel/Ukr ICT communities. ICT R&D Policy Working Groups will be established in Bel/Ukr that meet to discuss co-operation in areas of mutual interest and develop a Road Map towards a Joint Strategy in ICT R&D. The SCUBE-ICT projects measurable results will include: a. Website and online database with information about 100-150 ICT actors in Bel/Ukr; b. 4 awareness raising/training events in Bel/Ukr concerning FP7 ICT; c. 6 ICT networking events; d. Support to at least 15 Bel/Ukr ICT actors to establish Joint Action Plans with EU actors; e. Support to at least 10 Bel/Ukr ICT actors to make FP7 proposals; f. ICT R&D Policy Working Groups involving EU and Bel/Ukr; and g. Roadmap towards a Joint Strategy in ICT R&D.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: SSH.2013.3.1-1 | Award Amount: 3.23M | Year: 2014

The overall objective of the TEMPER project consists of providing a comprehensive assessment of the pros and cons of recent initiatives to promote circular migration as an alternative to more traditional forms of temporary and permanent migration, not only among prospective migrants but also among current residents in the EU. These initiatives usually rely on a poor understanding of the ultimate reasons why some migrants spontaneously return to their country of origin while others do not, and why some of them re-migrate after return. More importantly, it is far from being clear that circular migration actually responds to the needs and expectations of many (potential) migrants from third-countries, and entails for them and their families more benefits than alternative forms of mobility. To overcome this lack of understanding, the TEMPER project will pursue three main objectives: (1) to identify the main drivers of return and circulation decisions of migrants recently involved in temporary and permanent migration, (2) to measure and explain the role that different programs and immigration policies at large have played in shaping those individual decisions and, (3) to assess the impact that different types of temporary, permanent and circular mobility have for migrant and non-migrant workers, their families and their employers. Two implicit assumptions will be tested. First, that circularity is a realistic alternative to both strictly temporary labour and permanent settlement because there exists a large enough pool of prospective migrants and returnees interested in engaging in circular mobility. Secondly, that circularity benefits the involved parties, including migrants, their families and their areas of origin, more than traditional forms of migration.

Agency: European Commission | Branch: FP7 | Program: MC-ITN | Phase: PEOPLE-2007-1-1-ITN | Award Amount: 3.21M | Year: 2008

The search for life bearing planets elsewhere is one of the major themes in contemporary astronomy, and much science investment is committed or being directed to seek and study extra-solar planets, with projects like Corot, Kepler, JWST, and Darwin. Previous search efforts focus on finding earth-like planets around Sun-like stars, however, cool stars are by far the most populous potential planet hosts, and in recent years a prevailing view has developed that biological viability could benefit greatly from planets in their habitable zone. Our new large scale WFCAM Transit Survey (WTS) has just been awarded 200 nights on the UK Infrared Telescope, and will use the transit method to seek out small rocky planets around cool stars. The mass, radius, density and atmospheres of transiting planets can be directly measured, with previous discoveries around Sun-like stars being highly inhospitable gas giants known as hot-Jupiters. Around cool stars however, smaller, rocky planets can be detected by the transit method, and could be warm habitable worlds. The discovery of such planets would be extremely high profile both in the field and to the public, and impact a wide range of scientific areas. We propose an Initial Training Network to exploit the WTS for planet detection and characterisation, and to contribute to the future study of these and other planets via design phase work at our industrial node EADS Astrium. The network will have a large impact on our understanding of the diversity of habitable planets, and inspire both the general public through high profile discoveries, and schools/colleges through the provision of themed educational materials. Network researchers will gain a broad range of training in astronomical, computational, mathematical techniques during their research, as well as aquiring a wide variety of transferable skills in the use of mathematical algorithms, spectroscopy, databases, engineering design techniques, education and outreach.

Agency: European Commission | Branch: FP7 | Program: CSA-SA | Phase: INCO.2012-2.2 | Award Amount: 838.09K | Year: 2012

The major objectives of BILAT-UKR*AINA are to support the institutional dialogue on STI policy between the European Commission, the EU MS, CC and AC, and Ukraine, to provide analytical input to the dialogue at the JSTCC and to ensure practical follow-up and sustainability; Particularly, BILAT-UKR*AINA foresees in a flexible manner pilot activities to facilitate the implementation of the joint EU-Ukraine STI Roadmap; promotes RTDI cooperation opportunities to support the creation of networks and the participation in joint projects; monitors and analyses innovation and research cooperation expressed in co-publications, scientific and educational networks and in terms of joint projects; analyses, promotes and monitors the participation of EU researchers in Ukrainian S&T State Programmes; secures the outreach of the project to interested parties who are not consortium members and increases awareness about the assets of RTDI cooperation with Ukraine. The consortium is supported by the key stakeholders from the target country: the responsible Ministry, the State Agency, the National Information Point and the National Academy of Sciences - who are either project partners or members of the advisory board. Most partners have already cooperated in the preceding BILAT-UKR project and present herewith an Advanced INnovative Approach within BILAT-UKR*AINA.

Agency: European Commission | Branch: FP7 | Program: CP | Phase: SPA.2010.2.1-03 | Award Amount: 1.71M | Year: 2011

The present Project purpose is the problem-oriented processing of observational data collected and stored by former ionospheric satellite missions their data mining with the aim to create the database of ionosphere waves catalogues. This is an urgent need of modern space science because its realization will help to improve considerably Space Weather nowcast and forecast and to promote the progress of actual today GMES and other applied studies, e.g., ionospheric monitoring of natural and man-made hazards. At a first stage of the Project fulfillment, the different types of wave data will be selected, processed and arranged in topical catalogues: atmosphere gravity waves, moving plasma disturbances (bubbles, blobs, TID, etc), and ELF-VLF plasma emissions (whistler waves, hisses, etc). Then the Ionosphere Wave Service will be created including the composition of catalogues metadata to provide useful tool to access the database through a web portal. Ionosphere Wave Service will be promoted to a great number of scientists and specialists working in the numerous theoretical and applied space oriented branches. The particular goals of the POPDAT Project are: Collection of datasets from different sources which concern the wave-like phenomena in the upper atmosphere and ionosphere to form input data field for further processing; Appropriate design of the flexible software tools for the search of wavelike and/or any other anomalous behaviors detected in the satellite datasets; Creation of thematic catalogues of ionosphere perturbations, which have known, supposed or unknown origin; Implementation of a Ionosphere Wave Service accessible to scientific communities and public users; Creation of Ionosphere Virtual Dynamic Observatory to assist educational activities; Dissemination and promotion of the Ionosphere Wave Service at topical conferences and in scientific and public press.

Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: ENV.2009. | Award Amount: 8.27M | Year: 2010

The overall aim of the ODEMM project is to develop a set of fully-costed ecosystem management options that would deliver the objectives of the Marine Strategy Framework Directive, the Habitats Directive, the European Commission Blue Book and the Guidelines for the Integrated Approach to Maritime Policy. This will be achieved by: (i) providing a comprehensive knowledge base to support policy for the development of sustainable and integrated management of European marine ecosystems; (ii) developing Operational Objectives to achieve the High-Level Policy Objectives set by the MSFD and the HD, and with reference to the proposed Maritime Policy; (iii) identifying Management Options (individual management tools and combinations of tools) to meet the Operational Objectives; (iv) providing a risk assessment framework for the evaluation of Management Options and to assess the risk associated with the different options; (v) conducting a cost-benefit analysis of a range of Management Options using appropriate techniques; (vi) identifying stakeholder opinions on the creation of governance structures directed towards implementation of the ecosystem approach, and to elaborate different scenarios for changing governance structures and legislation to facilitate a gradual transition from the current fragmented management approach towards fully integrated ecosystem management; (vii) documenting the steps necessary for the transition from the current fragmented management scheme to a mature and integrated approach, and providing a toolkit that could be used to evaluate options for delivering ecosystem-based management; and (viii) communicating and consulting on the outcomes of the project effectively with policy makers and other relevant user groups.

Agency: European Commission | Branch: FP7 | Program: CSA-SA | Phase: INFRA-2007-2.1-01 | Award Amount: 336.45K | Year: 2008

The main objective of the project is to design the conceptual scheme of a research infrastructure supporting the networking of centres for high-quality research in Slavic lexicography, fostering their scientific capacity, integrating their digital resources and opening them up to the European academic community. The project will provide strategies for the coordination, unification and extension of existing digital lexical resources and the creation of new ones, in accordance with the recent advances in the field and the international standards. This will ensure their reusability and interoperability, so that researchers in humanities and social sciences as well as business will have easy access to digital bi- and multilingual dictionaries of Slavic languages. Thus the project will contribute to preserving and supporting the multilingual and multicultural European heritage. In more distant perspective we envisage the creation of a general lexical data base with the possibility of searching entries in any Slavic language, with information on the words etymology and correspondences in all Slavic languages and in English. The data base will possess a rich system of links between forms and meanings of words in synchrony and diachrony. An interactive Web portal will enable the supervised extension of the data base by the end users (Wiki-style) and ensure fast growth and relevance to the users needs. The partners in the project are research organisations from six European countries whose six national languages belong to the Slavic group: Bulgaria, Poland, Russia, Slovakia, Slovenia and Ukraine. All partners are national centres for high-quality research in lexicography and digital resources. Each partner is responsible for coordinating a part of the work matching their specialisation and experience. The six thematic working groups are designed as fora for discussing specific parts of the project, and the work programme provides a detailed breakup of the task in time.

Agency: European Commission | Branch: FP7 | Program: CSA-SA | Phase: INCO-2007-2.1 | Award Amount: 598.12K | Year: 2008

The main objectives of BILAT-UKR are: - to strengthen the S&T cooperation between the EU and Ukraine in particular through a stronger participation of Ukraine in FP7 and other Community programmes and initiatives. - to further improve the framework for enhanced future and sustainable S&T cooperation, especially regarding legal and funding issues. - to provide a knowledge base for new cooperation themes and priority areas, and for emerging horizontal issues of sustainable cooperation, especially in the fields of scientific mobility, innovation and infrastructure. - to provide support for the working groups set up to organize a thematic and high level policy dialogue between the Ministry of Education and Science of Ukraine and the European Commission. The consortium gathers 11 various institutions of 7 countries (amongst which 2 Ukrainian neighbours), having a long-standing experience in international S&T cooperation. The project can draw on and complement the experience the partners have gained in several cooperation projects under FP6 or FP7. BILAT-UKR will provide a new momentum to improve the participation of Ukrainian scientists to FP7, and will prepare the ground for a possible association of Ukraine to FP7. The proposal is also expected to have an impact on the implementation of the S&T dimension of the European Neighbouring policy.

Agency: European Commission | Branch: FP7 | Program: CP-CSA-Infra | Phase: INFRA-2011-1.1.14. | Award Amount: 7.58M | Year: 2011

The overall objective of the SeaDataNet II project is to upgrade the present SeaDataNet infrastructure into an operationally robust and state-of-the-art Pan-European infrastructure for providing up-to-date and high quality access to ocean and marine metadata, data and data products originating from data acquisition activities by all engaged coastal states, by setting, adopting and promoting common data management standards and by realising technical and semantic interoperability with other relevant data management systems and initiatives on behalf of science, environmental management, policy making, and economy. SeaDataNet is undertaken by the National Oceanographic Data Centres (NODCs), and marine information services of major research institutes, from 31 coastal states bordering the European seas, and also includes Satellite Data Centres, expert modelling centres and the international organisations IOC, ICES and EU-JRC in its network. Its 40 data centres are highly skilled and have been actively engaged in data management for many years and have the essential capabilities and facilities for data quality control, long term stewardship, retrieval and distribution. SeaDataNet II will undertake activities to achieve data access and data products services that meet requirements of end-users and intermediate user communities, such as GMES Marine Core Services (e.g. MyOcean), establishing SeaDataNet as the core data management component of the EMODNet infrastructure and contributing on behalf of Europe to global portal initiatives, such as the IOC/IODE Ocean Data Portal (ODP), and GEOSS. Moreover it aims to achieve INSPIRE compliance and to contribute to the INSPIRE process for developing implementing rules for oceanography.

Agency: European Commission | Branch: FP7 | Program: CSA-CA | Phase: INCO.2013-1.3 | Award Amount: 2.27M | Year: 2014

Danube-INCO.NET understands itself as strategic high-level coordination and support action. Its background is the macro-regional approach of the European Union, in particular the EU Strategy for the Danube Region (EUSDR) and its Priority Areas for Knowledge Society (PA7) and for Competitiveness (PA8). Based on strong institutionalised links with the PA Coordinators and the PA Steering Groups, a consortium of 19 partners from all over the region proposes to support the policy dialogue within the EUSDR, to exchange with other regional policy initiatives and to enhance bi-regional dialogue with a focus on the implementation of the Innovation Union and the ERA Framework. Danube-INCO.NET has selected the societal challenges of energy efficiency and renewable energy in a bio-based economy which are addressed by mapping and analysis, clustering and networking and the implementation of concrete pilot activities. Moreover also the societal challenge of innovative and inclusive societies in the Danube region is addressed through the provision of analytical evidence: Research and innovation activities are monitored with several instruments, a survey identifies barriers to cooperation and less competitive innovation systems are reflected through policy mix reviews. To implement concrete innovation support measures, smart specialisation strategies, technology transfer centres and a system of supporting the development of targeted project proposals is being introduced. Danube-INCO.NET is also committed towards the development of joint funding mechanisms - lending its attention to one of the most important milestones, the establishment of the Danube Region Research and Innovation Fund. In this respect, Danube-INCO.NET supports the cooperation among the leading indeed world-class innovative regions upstream to the regions downstream both at strategic and operative level.

Agency: European Commission | Branch: FP7 | Program: CP-IP-SICA | Phase: OCEAN.2011-4 | Award Amount: 11.32M | Year: 2012

Environmental policies focus on protecting habitats valuable for their biodiversity, as well as producing energy in cleaner ways. The establishment of Marine Protected Area (MPA) networks and installing Offshore Wind Farms (OWF) are important ways to achieve these goals. The protection and management of marine biodiversity has focused on placing MPAs in areas important for biodiversity. This has proved successful within the MPAs, but had little impact beyond their boundaries. In the highly populated Mediterranean and the Black Seas, bordered by many range states, the declaration of extensive MPAs is unlikely at present, so limiting the bearing of protection. The establishment of MPAs networks can cope with this obstacle but, to be effective, such networks must be based on solid scientific knowledge and properly managed (not merely paper parks). OWF, meanwhile, must be placed where the winds are suitable for producing power, but they should not have any significant impact on biodiversity and ecosystem functioning, or on human activities. The project will have two main themes: 1 - identify prospective networks of existing or potential MPAs in the Mediterranean and the Black Seas, shifting from a local perspective (centred on single MPAs) to the regional level (network of MPAs) and finally the basin scale (network of networks). The identification of the physical and biological connections among MPAs will elucidate the patterns and processes of biodiversity distribution. Measures to improve protection schemes will be suggested, based on maintaining effective exchanges (biological and hydrological) between protected areas. The national coastal focus of existing MPAs will be widened to both off shore and deep sea habitats, incorporating them into the networks through examination of current legislation, to find legal solutions to set up transboundary MPAs. 2 - explore where OWF might be established, producing an enriched wind atlas both for the Mediterranean and the Black Seas. OWF locations will avoid too sensitive habitats but the possibility for them to act as stepping-stones through MPAs, without interfering much with human activities, will be evaluated. Socioeconomic studies employing ecosystem services valuation methods to develop sustainable approaches for both MPA and OWF development will also be carried out, to complement the ecological and technological parts of the project, so as to provide guidelines to design, manage and monitor networks of MPAs and OWF. Two pilot projects (one in the Mediterranean Sea and one in the Black Sea) will test in the field the assumptions of theoretical approaches, based on previous knowledge, to find emerging properties in what we already know, in the light of the needs of the project. The project covers many countries and involves researchers across a vast array of subjects, in order to achieve a much-needed holistic approach to environmental protection. It will help to integrate the Mediterranean and Black Seas scientific communities through intense collective activities, combined with strong communications with stakeholders and the public at large. Consequently, the project will create a permanent network of excellent researchers (with cross fertilization and further capacity building) that will also work together also in the future, making their expertise available to their countries and to the European Union.

Agency: European Commission | Branch: FP7 | Program: CSA-CA | Phase: KBBE.2010.1.2-06 | Award Amount: 1.30M | Year: 2011

The Community Plant Health Regime (CPHR) aims to prevent the introduction, establishment and spread of regulated and quarantine plant pests. These pests pose increasing risks to European agriculture, horticulture, forestry and the environment. This is due to increased globalisation of trade (volume and diversity), but is exacerbated by climate change and EU expansion (increased pathways). In comparison, resources for national plant health inspection services, science programmes and research are declining. For this reason, the EUPHRESCO Phytosanitary ERA-Net was established in 2006, with the full support of the EU Council Working Party of Chief Officers of Plant Health Services. It aimed to better coordinate national, trans-national and EU-funded research in direct support of the CPHR (EU policy, inspection services and science capability). The current EUPHRESCO Project ends in 2010; this new EUPHRESCO-II proposal will deepen and enlarge the previously successful cooperation between research programmes. EUPHRESCO-II will: Strengthen the basis for, and result in, a self-sustainable, long-term, durable network; Deepen the cooperation through continued trans-national research that optimises limited resources, supports other plant health initiatives and coordination mechanisms, and further develops a culture of collaboration; Deepen the cooperation by improving processes and tools and reducing barriers; Enlarging the network (31 partners, plus 14 Observers) to increase its critical mass, address more regional or sector-based (e.g. forestry plant health) issues and increase opportunities for international cooperation with non-European countries that are either the source of quarantine pests or share similar pest problems. Overall, EUPHRESCO II will enhance the European Research Area that supports the CPHR. It will directly support EU policy, operations and science capability by providing rapid and customised answers to challenges caused by quarantine plant pests.

Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENV.2012.6.2-3 | Award Amount: 12.05M | Year: 2012

The objectives are to: (i) improve our understanding of human activities impacts (cumulative, synergistic, antagonistic) and variations due to climate change on marine biodiversity, using long-term series (pelagic and benthic). This objective will identify the barriers and bottlenecks (socio-economic and legislative) that prevent the GES being achieved (ii) test the indicators proposed by the EC, and develop new ones for assessment at species, habitats and ecosystems level, for the status classification of marine waters, integrating the indicators into a unified assessment of the biodiversity and the cost-effective implementation of the indicators (i.e. by defining monitoring and assessment strategies). This objective will allow for the adaptive management including (a) strategies & measures, (b) the role of industry and relevant stakeholders (including non-EU countries), and (c) provide an economic assessment of the consequences of the management practices proposed. It will build on the extensive work carried out by the Regional Seas Conventions (RSC) and Water Framework Directive, in which most of the partners have been involved (iii) develop/test/validate innovative integrative modelling tools to further strengthen our understanding of ecosystem and biodiversity changes (space & time); such tools can be used by statutory bodies, SMEs and marine research institutes to monitor biodiversity, applying both empirical and automatic data acquisition. This objective will demonstrate the utility of innovative monitoring systems capable of efficiently providing data on a range of parameters (including those from non-EU countries), used as indicators of GES, and for the integration of the information into a unique assessment The consortium has 23 partners, including 4 SMEs (close to 17% of the requested budget) and 2 non-EU partners (Ukraine & Saudi Arabia). Moreover, an Advisory Board (RSC & scientific international scientists) has been designed,to ensure a good relationship with stakeholders

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: KBBE.2013.1.4-09 | Award Amount: 2.64M | Year: 2013

The continuous supply of services provided by agricultural systems is increasingly threatened by climate change in association with an estimated increase in the frequency of extreme weather events such as droughts, heat waves or heavy precipitation events. MODEXTREME has the overarching goal to help the European and non-European agriculture face extreme climatic events by improving the capability of biophysical models simulating vegetation responses to integrate climatic variability and extremes. To reach this goal, the project will achieve the following objectives: Scientific objectives: - Identify and integrate into simulation models, the responses of main crop and grassland systems to environmental conditions associated with extreme climatic events; - Improve yield monitoring and forecasting systems via multiple observational constraints to be assimilated into process-based models across different climate conditions; - Estimate possible trajectories of agricultural productivity in the short (during current season) to medium time horizons and associated uncertainties. This involves taking into account the genetic progress and its effects on responses to extreme environmental conditions. Technological objectives: - Build a consistent, multi-domain data repository for use in studying climate variability and extreme events relevant for agricultural production; - Develop generically reusable software units that implement libraries of models. This will allow (i) extending the vegetation response, as implemented in existing modelling solutions, to weather extremes, (ii) extending the multi-model platform for plant growth and development simulations of the European Commission Joint Research Centre (MARS: Monitoring Agricultural ResourceS); - Prototype alternate versions of the workflows for agricultural production monitoring and scenario analysis both using new modelling solutions composed in the project, and by focusing on extreme events.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: AAT.2010.1.1-1.;AAT.2010.1.1-3. | Award Amount: 5.10M | Year: 2012

Vision-2020, whose objectives include the reduction of emissions and a more effective transport systems, puts severe demands on aircraft velocity and weight. These require an increased load on wings and aero-engine components. The greening of air transport systems means a reduction of drag and losses, which can be obtained by keeping laminar boundary layers on external and internal airplane parts. Increased loads make supersonic flow velocities more prevalent and are inherently connected to the appearance of shock waves, which in turn may interact with a laminar boundary layer. Such an interaction can quickly cause flow separation, which is highly detrimental to aircraft performance, and poses a threat to safety. In order to diminish the shock induced separation, the boundary layer at the point of interaction should be turbulent. The main objective of the TFAST project is to study the effect of transition location on the structure of interaction. The main question is how close the induced transition may be to the shock wave while still maintaining a typical turbulent character of interaction. The main study cases - shock waves on wings/profiles, turbine and compressor blades and supersonic intake flows - will help to answer open questions posed by the aeronautics industry and to tackle more complex applications. In addition to basic flow configurations, transition control methods (stream-wise vortex generators and electro-hydrodynamic actuators) will be investigated for controlling transition location, interaction induced separation and inherent flow unsteadiness. TFAST for the first time will provide a characterization and selection of appropriate flow control methods for transition induction as well as physical models of these devices. Emphasis will be placed on closely coupled experiments and numerical investigations to overcome weaknesses in both approaches.

Agency: European Commission | Branch: FP7 | Program: CP-CSA | Phase: SPA.2011.1.5-01 | Award Amount: 41.18M | Year: 2012

The main objective of the MyOcean2 project will be to operate a rigorous, robust and sustainable Ocean Monitoring and Forecasting component of the GMES Marine Service (OMF/GMS) delivering ocean physical state and ecosystem information to intermediate and downstream users in the areas of marine safety, marine resources, marine and coastal environment and climate, seasonal and weather forecasting. This is highly consistent with the objective of the FP7 Space Work Programme to support a European Space Policy focusing on applications such as GMES (Global Monitoring for Environment and Security), with benefits for citizens, but also other space foundation areas for the competitiveness of the European space industry. In the period from April 2012 to September 2014, MyOcean2 will ensure a controlled continuation and extension of the services and systems already implemented in MyOcean, a previous funded FP7 project that has advanced the pre-operational marine service capabilities by conducting the necessary research and development. To enable the move to full operations as of 2014, MyOcean2 is targeting the prototype operations, and developing the necessary management and coordination environment, to provide GMES users with continuous access to the GMES service products, as well as the interfaces necessary to benefit from independent R&D activities. MyOcean2 will produce and deliver services based upon the common-denominator ocean state variables that are required to help meet the needs for information of those responsible for environmental and civil security policy making, assessment and implementation. MyOcean2 is also expected to have a significant impact on the emergence of a technically robust and sustainable GMES service infrastructure in Europe and significantly contribute to the environmental information base allowing Europe to independently evaluate its policy responses in a reliable and timely manner

Agency: European Commission | Branch: FP7 | Program: CP-SICA | Phase: ENV.2008. | Award Amount: 8.01M | Year: 2009

The Black Sea Catchment is internationally known as one of ecologically unsustainable development and inadequate resource management, which has led to severe environmental, social and economic problems. EnviroGRIDS @ Black Sea Catchment aims at building the capacities of regional stakeholders to use new international standards to gather, store, distribute, analyze, visualize and disseminate crucial information on past, present and future states of the environment, in order to assess its sustainability and vulnerability. The EnviroGRIDS @ Black Sea Catchment project addresses these issues by bringing several emerging information technologies that are revolutionizing the way we are able to observe our planet. The Group on Earth Observation Systems of Systems (GEOSS) is building a data-driven view of our planet that feeds into models and scenarios. EnviroGRIDS aims at building the capacity of scientist to assemble such a system in the Black Sea Catchment, the capacity of decision-makers to use it, and the capacity of the general public to understand the important environmental, social and economic issues at stake. To achieve its objectives, EnviroGRIDS will build an ultra-modern Grid enabled Spatial Data Infrastructure (GSDI) that will become one component in the Global Earth Observation System of Systems (GEOSS), compatible with the new EU directive on Infrastructure for Spatial Information in the European Union (INSPIRE). EnviroGRIDS will particularly target the needs of the Black Sea Commission (BSC) and the International Commission for the Protection of the Danube River (ICPDR) in order to help bridging the gap between science and policy.

Agency: European Commission | Branch: FP7 | Program: CP | Phase: Fission-2013-1.1.2 | Award Amount: 14.73M | Year: 2013

The CAST project (CArbon-14 Source Term) aims to develop understanding of the generation and release of 14C from radioactive waste materials under conditions relevant to waste packaging and disposal to underground geological disposal facilities. The project will focus on releases from irradiated metals (steels, Zircaloys) and from ion-exchange materials as dissolved and gaseous species. A study to consider the current state of the art knowledge with regards to 14C release from irradiated graphite will also be undertaken, to further our knowledge from existing projects in this area i.e. CARBOWASTE. The scientific understanding obtained from these studies will then be considered in terms of national disposal programmes and impact on safety assessments. The knowledge gained from the whole of CAST will be disseminated within the project partners and to wider stakeholders and organisation, with a specific objective on education and training.

Agency: European Commission | Branch: FP7 | Program: CSA | Phase: INFRA-2007-3.0-03 | Award Amount: 4.06M | Year: 2008

PESI provides standardised and authoritative taxonomic information by integrating and securing Europes taxonomically authoritative species name registers and nomenclators (name databases) that underpin the management of biodiversity in Europe.\nPESI defines and coordinates strategies to enhance the quality and reliability of European biodiversity information by integrating the infrastructural components of four major community networks on taxonomic indexing into a joint work programme. This will result in functional knowledge networks of taxonomic experts and regional focal points, which will collaborate on the establishment of standardised and authoritative taxonomic (meta-) data. In addition PESI will coordinate the integration and synchronisation of the European taxonomic information systems into a joint e-infrastructure and the set up of a common user-interface disseminating the pan-European checklists and associated user-services results\nThe organisation of national and regional focal point networks as projected not only assures the efficient access to local expertise, but is also important for the synergistic promotion of taxonomic standards throughout Europe, for instance to liaison with national governmental bodies on the implementation of European biodiversity legislations. In addition PESI will start with the geographic expansion of the European expertise networks to eventually cover the entire Palaearctic biogeographic region.\nPESI supports international efforts on the development of a Global Names Architecture by building a common intelligent name-matching device in consultation with the principal initiatives (GBIF, TDWG, EoL, SpeciesBase). PESI contributes the development of a unified cross-reference system and provides of high quality taxonomic standards. PESI will further involve the Europe-based nomenclatural services and link the planned joint European taxonomic e-infrastructures middle-layer to the global e-gateway.

Agency: European Commission | Branch: FP7 | Program: CP | Phase: SPA-2007-1.1-01 | Award Amount: 55.01M | Year: 2009

MyOcean is THE PROJECT to set up infrastructures, services and resources to prepare the operational deployment of first Marine Core Services. My Ocean answers to the topic SPA.2007.1.1.01 - development of upgraded capabilities for existing GMES fast-track services and related (pre)operational services. MyOcean is proposed by a consortium of 67 partners spread in maritime countries: - federated around a core team of MCS operators - connected to Key R&D players with independent experts - rich of key intermediate users ready to commit to the service validation and promotion and play the role of beta-testers. My Ocean is not the MCS but shall provide the major building blocks and umbrella to allow the operational deployment of a full MCS in cooperation with external providers (National Met services, EMSA, ). MyOcean proposes to set an incremental logic and a governance to remain sustainable after the project and able to welcome new science and new services. The project includes the following tasks: - The definition of a first set of operational Marine Core Services, first package of an enlarged MCS portfolio - The operational development of European upgraded capacities acting as a common denominator for Member States, EU needs for reference marine information - The pre-operational validation of these MCS infrastructures and services and their formal commissioning - The marketing and promotion of Marine Core Services for use widening - The elaboration of a committed organisation to support at long term MCS operations, evolution and research. My Ocean inherits, benefits and pursues a European operational oceanography strategy started within EUROGOOS networks, and progressively implemented through subsequent projects: MERSEA Strand1, MERSEA, BOSS4. BOSS4 will provide a Version 0 of Marine Core Services fast tracks. MyOcean work plan shall cover the development, validation and pre-operations of the following versions of MCS V1 and V2.

Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: ENV.2009. | Award Amount: 8.53M | Year: 2009

Coastal areas are vital economic hubs in terms of settlement, industry, agriculture, trade and tourism to mention some key sectors. There are already many coastal problems including erosion, flood risk and long-term habitat deterioration. As economies continue to develop the asset base at risk will grow, while accelerating climate change will increase the likelihood of damaging extreme events, as well as accelerate habitat decline. Existing coastal management and defence approaches are not well tuned to these challenges as they assume a static situation. THESEUS will develop a systematic approach to delivering both a low-risk coast for human use and healthy habitats for evolving coastal zones subject to multiple change factors. The innovative combined mitigation and adaptation technologies to be considered will include ecologically-based mitigation measures (such as restoration and/or creation of habitats), hydro-morphodynamic techniques (such as wave energy converters, sediment reservoirs, multi-purpose structures, overtop resistant dikes), actions to reduce the impact on society and economy (such as promotion of risk awareness or spatial planning) and GIS-based software to support defence planning. To integrate the best of these technical measures in a strategic policy context we will develop overarching THESEUS guidelines which will considers the environmental, social and economic issues raised in any coastal area. It is in this spirit that THESEUS will advance European and international experience in applying innovative technologies to reducing coastal risks. THESEUS activities will be carried out within a multidisciplinary framework using 8 study sites across Europe, with specific attention to the most vulnerable coastal environments such as deltas, estuaries and wetlands, where many large cities and industrial areas are located.

Agency: European Commission | Branch: FP7 | Program: CSA-CA | Phase: Fission-2013-3.3.1 | Award Amount: 1.28M | Year: 2014

The IARC previously led an EU funded project Agenda for Research on Chernobyl Health (ARCH), the objective of which was to recommend a strategic health research agenda following the Chernobyl accident. The ARCH demonstrated that Chernobyl provides a unique opportunity to answer questions about radiation risks. The multidisciplinary group of experts strongly supported the need for well-designed and coordinated long-term studies. The new initiative emphasises the need to build partnerships with the three countries mainly affected, plus Japan, the USA and European countries in order to take the research agenda forward. The purpose is therefore to bring together both key scientific players and funding partners to decide on the research priorities and to seek sustainable funding for those priority areas. Work under this proposal will be divided into five closely integrated work packages (WPs): WP 1: Coordination and overall management WP 2: International collaboration and agreement on research programme 2.1: Setting up an International network of research institutes committed to long-term research on Chernobyl 2.2: Development of Chernobyl Research Programme and timetable WP 3: Assessment of Chernobyl research infrastructures 3.1: Evaluation of the cohorts of exposed populations suitable to form Chernobyl Life-span cohorts 3.2: Inventory of dosimetric approaches and existing databases 3.3: Inventory of stored biological samples WP 4: International collaboration on proposing funding mechanism WP 5: Agreement on coordinating structure and setting-up research framework The CO-CHER project has a potential to develop a sustainable plan for research into the health effects of the Chernobyl accident with optimal use of available resources. It is completely in line with the MELODI initiative for integrated, long term effort in low dose risk research. The coordination action will also open new collaborations outside existing European networks.

News Article | November 29, 2016
Site: phys.org

At a height of 108 metres (355 feet), it is taller than New York's Statue of Liberty—while its weight of 36,000 tons is three times heavier than the Eiffel Tower in Paris. The 2.1-billion-euro ($2.2-billion) structure sponsored by the European Bank for Reconstruction and Development (EBRD) has been edged into place over an existing crumbling dome that the Soviets built in haste when disaster struck three decades ago. "We welcome this milestone in the process of the transformation of Chernobyl as a symbol of what we can achieve jointly with strong, determined and long-term commitment," EBRD president Suma Chakrabarti said in a statement. Radioactive fallout from the site of the world's worst civil nuclear accident spread across three-quarters of Europe and prompted a global rethink about the safety of atomic fuel. Work on the previous dome began after a 10-day fire caused by the explosion was contained but radiation still spewed out of the stricken reactor. "It was done through the super-human efforts of thousands of ordinary people," the Chernobyl museum's deputy chief Anna Korolevska told AFP. "What kind of protective gear could they have possibly had? They worked in regular construction clothes." About 30 of the cleanup workers known as liquidators were killed on site or died from overwhelming radiation poisoning in the following weeks. The Soviets sought to try to cover up the accident that was caused by errors during an experimental safety check and its eventual toll is still hotly disputed. The United Nations estimated in 2005 that around 4,000 people had either been killed or were left dying from cancer and other related diseases. But the Greenpeace environmental protection group believes the figure may be closer to 100,000. Authorities maintain a 30-kilometre-wide (19-mile) exclusion zone around the plant in which only a few dozen elderly people live. One of the main problems of the Soviet-era response was the fact that it only had a 30-year lifespan. Yet its deterioration began much sooner than that. "Radioactive dust inside the structure is being blown out through the cracks," Sergiy Paskevych of Ukraine's Institute of Nuclear Power Plant Safety Problems told AFP. Paskevych added that the existing structure could crumble under extreme weather conditions. The new arch should be able to withstand tremors of 6.0 magnitude—a strength rarely seen in eastern Europe—and tornados that strike the region only once every million years. Kiev has complained that European assistance was slow to materialise. The EBRD found 40 state sponsors to fund a competition in 2007 to choose who should build the massive moveable dome. A French consortium of two companies known as Novarka finished the designs in 2010 and began construction two years later. The shelter was edged towards the fourth reactor in just under three weeks of delicate work this month that was interrupted by bad weather and other potential dangers. It will later be fitted with radiation control equipment as well as air vents and fire fighting measures. The equipment inside the arch is expected to be operative by the end of 2017. "Only then will we begin to disassemble the old, unstable structure," the head of the State Nuclear Regulatory Inspectorate of Ukraine, Sergiy Bozhko, told AFP. But he said no timeframe had yet been set for the particularly hazardous work of removing all the remaining nuclear fuel from inside the plant or dismantiling the old dome. Novarka believes that its arch will keep Europe safe from nuclear fallout for the next 100 years.

Agency: European Commission | Branch: FP7 | Program: CP-CSA-Infra | Phase: INFRA-2008-1.1.1 | Award Amount: 4.00M | Year: 2009

The recently finished FP6 RI Black Sea SCENE project has established a Black Sea Scientific Network of leading environmental and socio-economic research institutes, universities and NGOs from the countries around the Black Sea and has developed a distributed virtual data and information infrastructure that is populated and maintained by these organisations to improve the identification, access, exchange, quality indication and use of their data and information about the Black Sea. The Black Sea SCENE research infrastructure stimulates scientific cooperation, exchange of knowledge and expertise, and strengthens the regional capacity and performance of marine environmental data and information management, underpins harmonization with European marine data quality control/assessment procedures and adoption of international meta-data standards and data-management practices, providing improved data & information delivery services for the Black Sea region at a European level. The Up-Grade of Black Sea SCENE project aims: a) to extend the existing research infrastructure with 19 marine environmental institutes/organizations from the 6 Black Sea countries, b) to implement the results of the Joint Research Activities of the FP6 RI SeaDataNet project (common communication standards and adapted technologies to ensure the datacenters interoperability), c) to network the existing and new Black Sea datacenters, active in data collection, and provide integrated databases of standardized quality on-line, d) to realize and improve on-line access to in-situ and remote sensing data, meta-data and products and e) to adopt standardized methodologies for data quality checking to ensure the quality, compatibility and coherence of the data issuing from so many sources. The Up-Grade Black Sea SCENE project is undertaken by 51 partners of which 43 are located in the Black Sea countries.

Agency: European Commission | Branch: FP7 | Program: CP-IP-SICA | Phase: OCEAN.2011-3 | Award Amount: 16.99M | Year: 2012

The overall scientific objectives of PERSEUS are to identify the interacting patterns of natural and human-derived pressures on the Mediterranean and Black Seas, assess their impact on marine ecosystems and, using the objectives and principles of the Marine Strategy Framework Directive as a vehicle, to design an effective and innovative research governance framework based on sound scientific knowledge. Well-coordinated scientific research and socio-economic analysis will be applied at a wide-ranging scale, from basin to coastal. The new knowledge will advance our understanding on the selection and application of the appropriate descriptors and indicators of the MSFD. New tools will be developed in order to evaluate the current environmental status, by way of combining monitoring and modelling capabilities and existing observational systems will be upgraded and extended. Moreover, PERSEUS will develop a concept of an innovative, small research vessel, aiming to serve as a scientific survey tool, in very shallow areas, where the currently available research vessels are inadequate. In view of reaching Good Environmental Status (GES), a scenario-based framework of adaptive policies and management schemes will be developed. Scenarios of a suitable time frame and spatial scope will be used to explore interactions between projected anthropogenic and natural pressures. A feasible and realistic adaptation policy framework will be defined and ranked in relation to vulnerable marine sectors/groups/regions in order to design management schemes for marine governance. Finally, the project will promote the principles and objectives outlined in the MSFD across the SES. Leading research Institutes and SMEs from EU Member States, Associated States, Associated Candidate countries, non-EU Mediterranean and Black Sea countries, will join forces in a coordinated manner, in order to address common environmental pressures, and ultimately, take action in the challenge of achieving GES.

Bryk T.,Ukrainian Academy of Sciences | Bryk T.,Kharkiv Polytechnic Institute | Belonoshko A.B.,KTH Royal Institute of Technology
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

It is shown, that the embedded-atom potential nicely describing structural properties of high pressure Fe can be successfully used for description of collective dynamics of liquid iron. A combination of molecular dynamics simulations and a fit-free analysis based on the approach of generalized collective modes (GCM) is used for calculations of spectra of collective excitations and relaxing modes at 1843 K. The obtained spectrum of acoustic excitations in the long-wavelength region perfectly agrees with the experimental speed of sound and reproduces the dispersion estimated from inelastic X-ray scattering (IXS) experiments. Heat fluctuations in liquid Fe were studied and resulted in calculated ratio of specific heats γ-1.40 being in agreement with the IXS-experiment estimate. We report analysis of the wave-number dependence of relaxation processes and their contributions to dynamic structure factors. This permits estimation of most important relaxation processes contributing to the shape of dynamic structure factors of liquid Fe in different regions of wave numbers. © 2012 American Physical Society.

Nikitin A.Yu.,University of Zaragoza | Nikitin A.Yu.,Ukrainian Academy of Sciences | Garcia-Vidal F.J.,Autonomous University of Madrid | Martin-Moreno L.,University of Zaragoza
Physical Review Letters | Year: 2010

We present an analytical expression for the electromagnetic field at the surface radiated by a hole in a metal film. This expression is valid for any metal, from the optical range to longer wavelengths, and for distances to the hole larger than a few tens of nanometers. The field pattern presents a rich behavior, showing three regions (a complex short distance, an intermediate range dominated by surface plasmon polaritons, and a long-distance one dominated by Norton waves). The crossover distances between these regimes depend strongly on both the wavelength and the angle with respect to the incident field. © 2010 The American Physical Society.

Shvets A.,Ukrainian Academy of Sciences | Hayakawa M.,University of Electro - Communications
Surveys in Geophysics | Year: 2011

The monitoring of global lightning activity and its spatial and temporal variations is known to be very essential for the study of global warming, the subject of greatest concern to human beings on planet Earth today. As a method of remote sensing for the global lightning distribution, we have proposed an inverse problem by using the data of natural electromagnetic noise in the ELF (extremely low frequency) Schumann resonance (SR) band observed simultaneously at a few stations around the world. The fundamentals of this inversion problem (or ELF tomography) to the SR data have been presented and the first attempt to deduce the global lightning distribution by means of the real SR data has been performed, which has indicated a possibility of snapshots of well-known thunderstorm centers on the globe. This ELF tomography consists of two stages. The first stage is the inversion of the ELF field power spectra to the distribution of lightning intensity by distance relative to an observation point. The obtained distance profiles of intensity of sources at a few stations are used as tomographic projections for reconstructing a spatial distribution of sources in the second stage. Maps of the global lightning distributions constructed by the result of inversions of ELF background field spectra obtained from three stations around the world show that the most active regions vary meridionally on the diurnal time scale being connected mainly with continental areas in the tropics. We do hope that this kind of inversion method to multi-stationed ELF data will be of great importance in the future. © 2011 Springer Science+Business Media B.V.

Avramenko A.A.,Ukrainian Academy of Sciences | Blinov D.G.,Ukrainian Academy of Sciences | Shevchuk I.V.,MBtech Group
Physics of Fluids | Year: 2011

Processes of heat, momentum, and concentration transport in a boundary layer of a nanofluid near a flat wall were studied. The study was performed by means of numerical analysis of boundary layer equations in a self-similar form. Self-similar forms of these equations were obtained based on symmetry properties (Lie groups). In doing so, dependence of physical properties (viscosity, thermal conductivity, and diffusion coefficient) on concentration of nanofluids and temperature were taken into account. Effects of concentration of the nano-particles on velocity and temperature profiles, as well as on the relative Nusselt numbers and skin-friction coefficients, were elucidated. © 2011 American Institute of Physics.

Braun O.M.,Ukrainian Academy of Sciences | Peyrard M.,Laboratoire Of Physique Of Lecole Normale Superieure Of Lyon
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2010

At the mesoscale friction occurs through the breaking and formation of local contacts. This is often described by the earthquakelike model which requires numerical studies. We show that this phenomenon can also be described by a master equation, which can be solved analytically in some cases and provides an efficient numerical solution for more general cases. We examine the effect of temperature and aging of the contacts and discuss the statistical properties of the contacts for different situations of friction and their implications, particularly regarding the existence of stick-slip. © 2010 The American Physical Society.

Nikitin A.Yu.,University of Zaragoza | Nikitin A.Yu.,Ukrainian Academy of Sciences | Guinea F.,CSIC - Institute of Materials Science | Garcia-Vidal F.J.,Autonomous University of Madrid | Martin-Moreno L.,University of Zaragoza
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

The extraordinary properties of graphene make it a very promising material for optoelectronics. However, basic attributes of the electromagnetic field in graphene are still unexplored. Here we report on the in-plane fields radiated by a nanoemitter lying on a graphene sheet in terahertz regime, which present a rich dependence on frequency, distance to the source, and orientation of the dipole moment. The field pattern is mainly composed of a core region, dominated by surface plasmons, where the electric field can be several orders of magnitude larger than in vacuum, and an outer region where the field is virtually the same as what it would be in vacuum. © 2011 American Physical Society.

Nikitin A.Y.,University of Zaragoza | Nikitin A.Y.,Ukrainian Academy of Sciences | Guinea F.,CSIC - Institute of Materials Science | Garcia-Vidal F.J.,Autonomous University of Madrid | Martin-Moreno L.,University of Zaragoza
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

Surface plasmon modes supported by graphene ribbon waveguides are studied and classified. The properties of both modes with the field concentration within the ribbon area (waveguiding modes) and on the edges (edge modes) are discussed. The waveguide and edge modes are shown to be separated from each other by a gap in wave numbers. The even-parity hybridized edge mode results to be the fundamental electromagnetic mode of the ribbon, possessing also the lowest losses. All of the plasmonic modes in the ribbons have an optimum frequency, at which the absorption losses are minimum, due to compromise between the plasmon confinement and the decrease of the group velocity close to the modal cutoff. The presented results show that the diffraction limit in graphene ribbons can be surpassed. © 2011 American Physical Society.

Huidobro P.A.,Autonomous University of Madrid | Nikitin A.Y.,University of Zaragoza | Nikitin A.Y.,Ukrainian Academy of Sciences | Gonzalez-Ballestero C.,Autonomous University of Madrid | And 2 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

We demonstrate that the interaction between two emitters can be controlled by means of the efficient excitation of surface plasmon modes in graphene. We consider graphene surface plasmons supported by either two-dimensional graphene sheets or one-dimensional graphene ribbons, showing in both cases that the coupling between the emitters can be strongly enhanced or suppressed. The super- and subradiant regimes are investigated in the reflection and transmission configurations. Importantly, the length scale of the coupling between emitters, which in vacuum is fixed by the free-space wavelength, is now determined by the wavelength of the graphene surface plasmons, which can be extremely short and can be tuned at will via a gate voltage. © 2012 American Physical Society.

Nikitin A.Yu.,University of Zaragoza | Nikitin A.Yu.,Ukrainian Academy of Sciences | Guinea F.,CSIC - Institute of Materials Science | Garcia-Vidal F.J.,Autonomous University of Madrid | Martin-Moreno L.,University of Zaragoza
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

Resonance diffraction in the periodic array of graphene microribbons is theoretically studied following a recent experiment. Systematic studies over a wide range of parameters are presented. It is shown that a much richer resonant picture would be observable for higher relaxation times of charge carriers: More resonances appear and transmission can be totally suppressed. The comparison with the absorption cross-section of a single ribbon shows that the resonant features of the periodic array are associated with leaky plasmonic modes. The longest-wavelength resonance provides the highest visibility of the transmission dip and has the strongest spectral shift and broadening with respect to the single-ribbon resonance, due to collective effects. © 2012 American Physical Society.

Mathey P.,University of Burgundy | Gadret G.,University of Burgundy | Shcherbin K.,Ukrainian Academy of Sciences
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2011

A slowing down of light pulses using backward-wave four-wave mixing is achieved in photorefractive crystals with different coupling strength. The delay and width of the output pulse are studied as a function of the input pulse width and pump intensity ratio for the amplified transmitted beam and for the phase-conjugated beam. The delay characteristics are compared with those of the two-beam coupling. It is demonstrated that the four-wave mixing process ensures a larger slowing down of short pulses (pulses with width shorter than the photorefractive response time) as compared to the photorefractive two-beam coupling scheme and guarantees the elimination of forerunners. The delay of long pulses in the four-wave mixing configuration is almost the same as the one that can be reached with two-beam coupling. The effect of absorption on the nonlinear shape transformation of the output pulses is discussed qualitatively. © 2011 American Physical Society.

Kutcherov V.G.,KTH Royal Institute of Technology | Krayushkin V.A.,Ukrainian Academy of Sciences
Reviews of Geophysics | Year: 2010

The theory of the abyssal abiogenic origin of petroleum is a significant part of the modern scientific theories dealing with the formation of hydrocarbons. These theories include the identification of natural hydrocarbon systems, the physical processes leading to their terrestrial concentration, and the dynamic processes controlling the migration of that material into geological reservoirs of petroleum. The theory of the abyssal abiogenic origin of petroleum recognizes that natural gas and petroleum are primordial materials of deep origin which have migrated into the Earth's crust. Experimental results and geological investigations presented in this article convincingly confirm the main postulates of the theory and allow us to reexamine the structure, size, and locality distributions of the world's hydrocarbon reserves. Copyright © 2010 by the American Geophysical Union.

Shvets A.V.,Ukrainian Academy of Sciences | Hobara Y.,University of Electro - Communications | Hayakawa M.,University of Electro - Communications
Journal of Geophysical Research: Space Physics | Year: 2010

Schumann resonance (SR) observations performed simultaneously by a global network consisting of three stations (Lekhta (Karelia, Russia), Moshiri (Hokkaido, Japan), and West Greenwich (Rhode Island, United States)) during almost 1 year were used for mapping world thunderstorm activity. A two-stage inverse problem is solved for locating lightning sources distributed over the Earth's surface from the SR background signals. The first stage consists of inversions of the SR magnetic field power spectra to the distributions of lightning intensity by distance relative to an observation point. The obtained distance profiles of intensity of sources are used as tomographic projections for reconstructing a spatial distribution of sources in the second stage. We have suggested the use of source distance profiles obtained from the spectra of outputs of two orthogonal magnetic antennas operating at each observatory as separate tomographic projections. It is shown that the implementation of additional information on the azimuthal distribution of sources, provided by angular selectivity of magnetic sensors, significantly improves the quality of global lightning mapping under the condition of a limited number of observation stations. Maps of the global lightning distributions constructed by the result of inversions of SR spectra show that the most active regions vary zonally on the seasonal time scale and meridionally on the diurnal time scale being connected mainly with continental areas in the tropics. Copyright 2010 by the American Geophysical Union.

Wang J.,CAS Shanghai Institute of Materia Medica | Sanchez-Rosello M.,University of Valencia | Sanchez-Rosello M.,Research Center Principe Felipe | Acena J.L.,University of the Basque Country | And 9 more authors.
Chemical Reviews | Year: 2014

Fluorine scans of ligands will become a routine strategy in lead optimization of pharmaceutical and agrochemical products. This extraordinary potential puts pressure on synthetic fluorine chemistry to deliver new methodologies for selective introduction of fluorine in desirable structural positions. There has been explosive research activity in the area of trifluoromethylation, including asymmetric versions. As a result, many truly practical, scalable methods for selective introduction of CF3 groups have been developed. Gefitinib, developed and launched by Astra-Zeneca, is an oral epidermal growth factor receptor (EGFR) inhibitor used for treatment of certain breast, lung, and other cancers. It contains a 3-chloro-4-fluoroaniline moiety linked to a quinazoline core. Bayer and Onyx developed and launched sorafenib, the first oral multikinase inhibitor that targets Raf and affects tumor signaling and the tumor vasculature. Sunitinib is a pyrrole-substituted 2-indolinone derivative developed and commercialized by Sugen and Pfizer.

Ahmed M.,University of Wollongong | Wexler D.,University of Wollongong | Casillas G.,University of Wollongong | Ivasishin O.M.,Ukrainian Academy of Sciences | Pereloma E.V.,University of Wollongong
Acta Materialia | Year: 2015

A metastable β-Ti alloy, Ti-10V-3Fe-3Al (wt.%), was subjected to thermomechanical processing (TMP), where the temperature of isothermal holding in the α + β phase field was varied in order to change the volume fraction of the α phase and, correspondingly, the β phase stability. Following TMP, compression tests were performed at room temperature to evaluate the deformation mode. Microstructural features induced by compression were identified using transmission electron microscopy. It was found that {3 3 2}〈1 1 3〉β deformation twinning along with stress-induced products (α″ martensite and ω lamellae) and slip were operational in the least stable β. The co-existence of {3 3 2}〈1 1 3〉β and {1 1 2}〈1 1 1〉β twinning was found at intermediate β stability along with other deformation products. With further increasing of β phase stability, no {3 3 2}〈1 1 3〉β twinning was detected whereas other deformation modes remained unchanged. In stable β phase, dislocation glide was the only deformation mode to be found. It was revealed that triggering stress required inducing the deformation products increases with the β phase stability. Based on the findings, a modification of the lower portion of the Bo-Md phase stability diagram is proposed. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Huidobro P.A.,Autonomous University of Madrid | Nesterov M.L.,Autonomous University of Madrid | Nesterov M.L.,Ukrainian Academy of Sciences | Martin-Moreno L.,University of Zaragoza | Garcia-Vidal F.J.,Autonomous University of Madrid
Nano Letters | Year: 2010

A new strategy to control the flow of surface plasmon polaritons at metallic surfaces is presented. It is based on the application of the concept of transformation optics to devise the optical parameters of the dielectric medium placed on top of the metal surface. We describe the general methodology for the design of transformation optical devices for surface plasmons and analyze, for proof-of-principle purposes, three representative examples with different functionalities: a beam shifter, a cylindrical cloak, and a ground-plane cloak. © 2010 American Chemical Society.

Soloshonok V.A.,University of the Basque Country | Soloshonok V.A.,Ikerbasque | Roussel C.,Aix - Marseille University | Kitagawa O.,Shibaura Institute of Technology | And 3 more authors.
Chemical Society Reviews | Year: 2012

This tutorial review describes the self-disproportionation of enantiomers (SDE) of chiral, non-racemic compounds, subjected to chromatography on an achiral stationary phase using an achiral eluent, which leads to the substantial enantiomeric enrichment and the corresponding depletion in different fractions, as compared to the enantiomeric composition of the starting material. The physicochemical background of SDE is a dynamic formation of homo- or heterochiral dimeric or oligomeric aggregates of different chromatographic behavior. This phenomenon is of a very general nature as the SDE has been reported for different classes of organic compounds bearing various functional groups and possessing diverse elements of chirality (central, axial and helical chirality). The literature data discussed in this review clearly suggest that SDE via achiral chromatography might be expected for any given chiral enantiomerically enriched compound. This presents two very important issues for organic chemists. First, chromatographic purification of reaction products can lead to erroneous determination of the stereochemical outcome of catalytic asymmetric reactions and second, achiral chromatography can be used as a new, nonconventional method for optical purifications. The latter has tremendous practical potential as the currently available techniques are limited to crystallization or chiral chromatography. However, a further systematic study of SDE is needed to develop understanding of this phenomenon and to design practical chromatographic separation techniques for optical purification of non-racemic mixtures by achiral-phase chromatography. © 2012 The Royal Society of Chemistry.

Sizov F.,Ukrainian Academy of Sciences | Rogalski A.,Military University of Technology
Progress in Quantum Electronics | Year: 2010

Terahertz (THz) detectors play an increasing role in different areas of human activities (e.g., security, biological, drugs and explosions detection, imaging, astronomy applications, etc.). In the paper, issues associated with the development and exploitation of THz radiation detectors are discussed. The basic physical phenomena and the recent progress in both direct and heterodyne detectors are described. More details concern Schottky barrier diodes, pair braking detectors, hot electron mixers and field-effect transistor detectors, where links between THz devices and modern technologies such as micromachining are underlined. Also the operational conditions of THz detectors and their upper performance limits are reviewed. © 2010 Published by Elsevier Ltd.

Braun O.M.,Ukrainian Academy of Sciences | Peyrard M.,Laboratoire Of Physique Of Lecole Normale Superieure Of Lyon
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2013

We introduce a simple model of earthquakes, inspired by the spring-block models, but describing contacts at a mesoscale. A single contact point synthesizes many rock contacts so that these "macrocontacts" can have an internal dynamics, described by a stochastic process, that leads to an evolution of their breaking thresholds. This aging process leads to the Gutenberg-Richter law, which relates the probability of occurrence of earthquakes to their magnitude. An analytical approach is used to determine the range of magnitudes in which this law applies. © 2013 American Physical Society.

Kolezhuk A.K.,RWTH Aachen | Kolezhuk A.K.,Jülich Research Center | Kolezhuk A.K.,Ukrainian Academy of Sciences
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2010

I show that in low dimensions the interactions in dilute Bose mixtures are strongly renormalized, which leads to a considerable change of stability conditions compared to the mean-field results valid in the high-density regime. Estimates are given for the two-component Bose-Hubbard model and for the Rb87-K41 mixture. © 2010 The American Physical Society.

D'Alimonte D.,New University of Lisbon | Shybanov E.B.,Ukrainian Academy of Sciences | Zibordi G.,European Commission - Joint Research Center Ispra | Kajiyama T.,New University of Lisbon
Optics Express | Year: 2013

This study addresses the regression of in-water radiometric profile data with the objective of investigating solutions to minimize uncertainties of derived products like subsurface radiance and irradiance (Lu0 and Ed0) and diffuse attenuation coefficients. Analyses are conducted using radiometric profiles generated through Monte Carlo simulations and field measurements. A nonlinear NL approach is presented as an alternative to the standard linear method LN. Results indicate that the LN method, relying on log-transformed data, tends to underestimate regression results with respect to NL operating on non-transformed data. The log-transformation is thus identified as the source of biases in data products. Observed differences between LN and NL regression results for Lu0 are of the order of 1-2%, that is well below the target uncertainty for data products from in situ measurements (i.e., 5%). For Ed0, instead, differences can easily exceed 5% as a result of more pronounced light focusing and defocusing effects due to wave perturbations. This work also remarks the importance of applying the multi-cast measurement scheme as a mean to increase the precision of data products. © 2013 Optical Society of America.

Shchukina N.,Ukrainian Academy of Sciences | Bueno J.T.,Institute of Astrophysics of Canarias | Bueno J.T.,University of La Laguna
Astrophysical Journal Letters | Year: 2011

The bulk of the quiet solar photosphere is thought to be significantly magnetized, due to the ubiquitous presence of a tangled magnetic field at subresolution scales with an average strength 〈B〉 ∼100 G. This conclusion was reached through detailed three-dimensional (3D) radiative transfer modeling of the Hanle effect in the Sr I 4607 Å line, using the microturbulent field approximation and assuming that the shape of the probability density function of the magnetic field strength is exponential. Here, we relax both approximations by modeling the observed scattering polarization in terms of the Hanle effect produced by the magnetic field of a 3D photospheric model resulting from a (state-of-the-art) magneto-convection simulation with surface dynamo action. We show that the scattering polarization amplitudes observed in the Sr I 4607 Å line can be explained only after enhancing the magnetic strength of the photospheric model by a sizable scaling factor, F ≈ 10, which implies 〈B〉 ≈ 130 G in the upper photosphere. We also argue that in order to explain both the Hanle depolarization of the Sr I 4607 Å line and the Zeeman signals observed in Fe I lines, we need to introduce a height-dependent scaling factor, such that the ensuing 〈B〉 ≈ 160 G in the low photosphere and 〈B〉 ≈ 130 G in the upper photosphere. © 2011. The American Astronomical Society. All rights reserved.

Agency: European Commission | Branch: FP7 | Program: CSA-CA | Phase: SiS-2007- | Award Amount: 512.89K | Year: 2008

More than 70% of the globe is covered by water, and Europe itself is bordered by four different water basins (the Atlantic Ocean/North Sea, the Mediterranean Sea, the Baltic Sea and the Black Sea) which have been shaping and influencing the European cultural, social and economic heritage since the ancient times. Seas are the paradigm of cross-cutting approaches to knowledge and life. Oceans are appealing and fascinating which make them ideal tools for engaging and communicating with the public at large (irrespective of its age) even on otherwise complex, distant and themes. 4SEAS comes by a consortium mainly composed of science museums/aquariums and research centres located on the coasts of the 4 different European basins. Partners will act as single modules within a European network based on ITC technologies. 4SEAS will address all of the above through the following actions: 1) direct engagement of the public at large following a bottom-up approach to science communication; 2) selection of marine-related topics to be addressed by each partner taking into account both a shared/European and a specific/regional approach; 3) cooperation between science centres and science museums/aquariums to develop each topic and set up interactive exhibitions; 4) large use of ITC technologies to ensure connectivity in the network and open to the widest audience; 5) museum exhibitions and marine-oriented external events planned and made available directly or on the web. 4SEAS aims are: 1) to ensure visibility and dissemination of research results to the civil society; 2) to enable the public to express its views and concerns about science; 3) to promote science to the young; 4) to strengthen the European citizens sense of participation in Europe through their direct involvement; 5) to develop a European awareness of the marine environment, cultural and technological aspects included; 6) to promote the regional approach within a broader context of European dimension.

Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: HEALTH.2012.2.1.1-2 | Award Amount: 15.18M | Year: 2013

The ageing of the European population represents a rapidly rising social and economic challenge. Especially cardiovascular morbidity increases with age, but unfortunately, elderly patients are often difficult to diagnose due to confounding factors, leading to uncertainties in clinical decision making with huge impact on patients outcomes. Hence, there is an unmet need for novel biomarkers for more accurate diagnosis, risk assessment, and clinical outcome prediction for both acute and chronic cardiovascular diseases in the elderly. The BestAgeing consortium aims to improve this lack of diagnostic capabilities by developing and validating innovative omics-based biomarkers particularly for elderly patients supporting healthy ageing in Europe. Our study design addresses the most frequent and severe cardiovascular diseases of elderly patients by incorporating the appropriate disease cohorts and biomaterials from European populations. We aim to develop new omics-assays to diagnose cardiovascular disease, estimate risk, and monitor the response to treatment in elderly. This is envisaged to enable a more stratified and economic delivery of medicine. We expect that BestAgeing will generate novel European medical technologies that can improve the efficacy and efficiency of our care for elderly patients, which will also impact on socioeconomic wealth in Europe.

Agency: European Commission | Branch: FP7 | Program: CP-IP-SICA | Phase: ENV.2009. | Award Amount: 8.83M | Year: 2010

Many efforts have been deployed for developing Integrated Coastal Zone Management (ICZM) in the Mediterranean and the Black Sea. Both basins have, and continue to suffer severe environmental degradation. In many areas this has led to unsustainable trends, which have impacted, on economic activities and human well-being. An important progress has been made with the launch of the ICZM Protocol for the Mediterranean Sea in January 2008. The ICZM Protocol offers, for the first time in the Mediterranean, an opportunity to work in a new way, and a model that can be used as a basis for solving similar problems elsewhere, such as in the Back Sea. The aim of PEGASO is to build on existing capacities and develop common novel approaches to support integrated policies for the coastal, marine and maritime realms of the Mediterranean and Black Sea Basins in ways that are consistent with and relevant to the implementation of the ICZM Protocol for the Mediterranean. PEGASO will use the model of the existing ICZM Protocol for the Mediterranean and adjust it to the needs of the Black Sea through three innovative actions: - Constructing an ICZM governance platform as a bridge between scientist and end-user communities, going far beyond a conventional bridging. The building of a shared scientific and end users platform is at the heart of our proposal linked with new models of governance. -Refining and further developing efficient and easy to use tools for making sustainability assessments in the coastal zone (indicators, accounting methods and models, scenarios, socio-economic valuations, etc). They will be tested and validated in 10 sites (CASES) and by the ICZM Platform, using a multi-scale approach for integrated regional assessment. -Implementing a Spatial Data Infrastructure (SDI), following INSPIRE Directive, to organize local geonodes and standardize spatial data to support information sharing on an interactive visor, to make it available to the ICZM Platform, and to disseminate all results of the project to all interested parties and beyond. -Enhancing regional networks of scientists and stakeholders in ICPC countries, supported by capacity building, to implement the PEGASO tools and lessons learned, to assess the state and trends for coast and sea in both basins, identifying present and future main threats agreeing on responses to be done at different scales in an integrated approach, including transdisciplinary and transbondary long-term collaborations.

Agency: European Commission | Branch: FP7 | Program: CP | Phase: SEC-2007-1.3-01;SEC-2007-4.3-03 | Award Amount: 2.64M | Year: 2008

The proposal concerns the technology development for instruments with the following capabilities: (a) To make spectroscopic measurements with efficiency equivalent to that of NaI detectors and energy resolution close to that of HPGe devices but without using cryogenic systems. (b) To find the direction and the distance of the radioactive source. (c) To localize the source into a cargo and estimate the radioactive source activity taking information about the source environment (shielding, absorption in the surrounding materials) (d) To work at a wide range of absorbed dose rates by adjusting the effective volume of the detector. The above capabilities will improve the quality of the data gathered by the customs officers during the routine inspections at the boarders and will assist the first responders in case of a radiological or nuclear emergency to estimate the exact situation. Basic tasks of the project will be: (a) The growth of high purity, detector grade Cd(Zn)Te crystals. Their performance will be optimized by material purification, selection of right dopants and post-growth processing to obtain high resistivity, high transport properties and homogeneous distribution of these material properties in the grown crystals. The growth of crystals with a diameter up to 75 mm will be performed. (b) The fabrication of pixel detectors having structure of p-n and Schottky diodes. This will permit the application of bias voltage high enough to collect all the induced charge by both electrons and holes. (c) The design of pixel electronics capable for simultaneous imaging and spectroscopy. The electronics will be bump bonded to the pixel detectors. This is essential for the localization and the identification of the radioactive source. (d) The construction of a portable instrument having a stack of detecting elements. This will allow to exploit the Compton Effect for the localization of the radioactive source and also to have variable detection efficiency.

Agency: European Commission | Branch: FP7 | Program: CP-SICA | Phase: NMP.2012.2.2-3 | Award Amount: 4.62M | Year: 2013

The overall objective is the development of new coatings for supercritical steam power plants for efficient and clean coal utilization. A significant reduction of emissions is expected by increasing efficiencies to > 50%. Currently, an efficiencies of 45% have been achieved in the last 30 years from subcritical 180 bar/540C to ultra-supercritical 300 bar/600-620C corresponding to a specific reduction of 20% of CO2 emissions. Efficiencies of 50% and more can be achieved by further raising the temperature, but conventional ferritic steels are not sufficiently oxidation resistant, since the temperature designed for operation was 550 C. From the mechanical properties perspective, ferritic steels can be used at temperatures up to 650 C and for higher temperatures austenic steels and Ni base alloys are being considered. One of the main objectives of this project is therefore to develop advanced coatings for steam environments which can resist the chemical attack of steam and fireside corrosion at temperatures higher than 620C employing materials with the required high temperature mechanical properties in particular creep strength. Ferriticmartensitic steels will be considered as substrate materials for up to 650 C whereas, austenitic steels will be explored for higher temperatures. In general higher temperatures mean higher oxidation rates, in particular when the oxidant is water vapour instead of oxygen. The introduction of carbon capture and sequestration (CCS) technologies also aiming to reduce emissions in power generation has also increased the interest in developing new material solutions able to reduce the economical and environmental penalty associated to energy production systems when CO2 is generated. For instance oxy-fuel combustion takes place in a N2 free atmosphere so oxygen is burned in near stoichiometric conditions with the fuel (pulverized carbon) producing and exhaust gases mainly composed of CO2 and H2O.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: SSH-2007-2.2-01 | Award Amount: 1.99M | Year: 2009

It is the aim of SHRINK SMART to study the role of policies and governance systems in different types of shrinking urban regions. It is based on comparative case studies from seven urban regions throughout Europe with a focus on disadvantaged urban regions in Eastern and Southern Europe that will provide a basis for analyzing different trajectories of shrinkage, understanding main challenges for urban planning and elaborating alternatives for urban governance. Firstly, the impact of shrinkage for urban and regional development that are caused by population losses will be identified focusing on different fields; the main challenges will be elaborated in a comparative perspective. Secondly, the relation between local institutional structures and modes of decision making on the one hand and the challenges of shrinkage on the other will be analysed. Here, the focus will be on strategies and instruments, on the relation of public and private actors and on institutional frameworks and cross-scale interactions. As a result, different trajectories of shrinkage processes within Europe will be defined and a set of policy recommendations for different constellations of shrinking cities will be developed. Furthermore, with the aim of providing practicable knowledge for decision-makers, SHRINK SMART will engage in extensive dissemination activities and develop a set of tools and policy recommendations. Summarizing, SHRINK SMART embarks on the following key objectives: to identify main challenges caused by shrinkage for urban and regional development, to develop an analytical framework for understanding the challenges of development in different types of shrinking urban regions, to draw lessons and develop sustainable and transferable policy-recommendations, to establish a network of experts on the phenomenon of shrinking urban regions, to discuss the findings with practitioners and policy-makers in order to improve transferability of knowledge into action.

Agency: European Commission | Branch: H2020 | Program: RIA | Phase: PROTEC-1-2014 | Award Amount: 2.36M | Year: 2015

The smooth functioning of the European economy and the welfare of its citizens depends upon an ever-growing set of services and facilities that are reliant on space and ground based infrastructure. Examples include communications (radio, TV, mobile phones), navigation of aircraft and private transport via GPS, and service industries (e.g. banking). These services, however, can be adversely affected by the space weather hazards. The forecasting of space weather hazards, driven by the dynamical processes originating on the sun, is critical to the mitigation of their negative effects. This proposal brings world leading groups in the fields of space physics and systems science in order to develop an accurate and reliable forecast system for space weather. It combines their individual strengths to significantly improve the current modelling capabilities within Europe and to produce a set of forecast tools to accurately predict the occurrence and severity of space weather events. Within project PROGRESS we will develop an European tool to forecast the solar wind parameters just upstream of the Earths magnetosphere. We will develop a comprehensive set of forecasting tools for geomagnetic indices. We will combine the most accurate data based forecast of electron fluxes at GEO with the most comprehensive physics based model of the radiation belts currently available to deliver a reliable forecast of radiation environment in the radiation belts. This project will deliver these individual forecast tools together with a unified tool that combines the forecasting tools with the prediction of the solar wind parameters at L1 to substantially increase the lead-time of space weather forecasts.

Agency: European Commission | Branch: FP7 | Program: CSA-SA | Phase: INCO.2013-9.1 | Award Amount: 1.12M | Year: 2013

The overall aim of the SECURE-R2I project is to reinforce cooperation with Eastern Partnership Countries (EPC) on bridging the gap between research and innovation for Horizon 2020 Societal Challenge 6. Inclusive, Innovative and Secure Societies. The research domains encompassed by Inclusive, Innovative and Secure Societies are broad. From the perspective of FP7 thematic priorities, they include ICT; Security; Nanosciences, Nanotechnologies, Materials (NMP); and Social Sciences and Humanities (SSH). These research domains also form the basis of important economic sectors in the EPC, with many potential benefits for the EU, but which also need European support to increase their exploitation. Addressing this issue, the SECURE-R2I project will assist R&D and innovation (RDI) organisations in EPC via a range of knowledge and technology transfer activities with the support of European specialists. The activities include: Networking between EPC organisations involved in RDI for Societal Challenge 6: It consists in mapping EPC RDI organisations and organising brokerage events to stimulate cooperation; Analysing the tech transfer opportunities and bottlenecks of EPC organisations involved in RDI for Societal Challenge 6: It consists in surveying these organisations and holding discussions with representatives of government, industry, government and intermediary bodies; Exchanging best practices in knowledge/technology transfer via a range of specific training courses and intensive summer schools in Europe; Twinning via R2I pilot projects: Each EPC research partner in the consortium will twin with another consortium partner who will support them to implement a bilateral R2I pilot project; Providing innovation support services to selected, high-potential EPC (and European) RDI: The activities will consist in coaching and advisory services on innovation and tech-transfer.

Agency: GTR | Branch: EPSRC | Program: | Phase: Research Grant | Award Amount: 438.49K | Year: 2015

The isolation of single-atomic layer graphene has led to a surge of interest in other layered crystals with strong in-plane bonds and weak, van der Waals-like, interlayer coupling. A variety of two-dimensional (2D) crystals have been investigated, including large band gap insulators and semiconductors with smaller band gaps such as transition metal dichalcogenides. Interest in these systems is motivated partly by the need to combine them with graphene to create field effect transistors with high on-off switching ratios. More importantly, heterostructures made by stacking different 2D crystals on top of each other provide a platform for creating new artificial crystals with potential for discoveries and applications. The possibility of making van der Waals heterostructures has been demonstrated experimentally only for a few 2D crystals. However, some of the currently available 2D layers are unstable under ambient conditions, and those that are stable offer only limited functionalities, i.e. low carrier mobility, weak optical emission/absorption, band gaps that cannot be tuned, etc. In a recent series of pilot experiments, we have demonstrated that nanoflakes of the III-VI layer compound, InSe, with thickness between 5 and 20 nanometers, have a thickness-tuneable direct energy gap and a sufficiently high chemical stability to allow us to combine them with graphene and related layer compounds to make heterostructures with novel electrical and optical properties. The main goal of this project is to develop graphene-hybrid heterostructures based on this novel class of two-dimensional (2D) III-VI van der Waals crystals. This group of semiconductors will enrich the current library of 2D crystals by overcoming limitations of currently available 2D layers and by offering a versatile range of electronic and optical properties. From the growth and fabrication of new systems to the demonstration of prototype devices, including vertical tunnel transistors and optical-enhanced-microcavity LEDs, our project will provide a platform for scientific investigations and will contribute to the technology push required to create new routes to device miniaturization, fast-electronics, sensing and photonics. There is great potential for further growth of all these sectors as the fabrication of 2D systems improves and as new properties are discovered and implemented in functional devices.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: SEC-2013.2.2-5 | Award Amount: 3.49M | Year: 2014

The goal of the project is to study, design and analyze on a risk-based approach a security system relying on multiple technologies for the protection of space control ground stations (SCGSs) against physical and cyber attacks and for intelligent reconfiguration of the ground station network in the case that one or more nodes fail. The SCOUT system is composed of three subsystems: 1) A distributed multisensor network for protection against physical attacks (SENSNET) composed of low impact sensors, namely passive sensors (passive radar, infrared camera, radiometric SAR) and low emission radars (noise radar based sensors (NRBS)). 2) A distributed telecommunication network sensing system for the detection and protection against cyber attacks (CYBERSENS), composed of several hardware probes (monitoring devices located at every ground stations), software probes (lightweight software sensing agents residing in the ground station machines), a honeynet (a decoy network used to detect and track cyberattacks), and a central engine which coordinates the entire infrastructure. 3) A management network system for automatic restoration and intelligence reconfiguration of the SCGS network (RECOVER), designed in accordance to the distributed Smart Sensor Network paradigm where the reconfiguration and control is governed by distributed logic. The first two subsystems allow acquisition of information about potential attacks of the SCGS that are processed by a centralized Main Control Unit (MCU) to have a situation awareness picture used to assess the degree of alert. They are controlled to focus their resources on the potential threats. According to the network fault, RECOVER is activated. The main tasks of the MCU are: 1) data processing 2) decision making support 3) subsystem control with graphical user interface included Two risk tools are developed to identify vulnerabilities of the SCGS against physical and cyber attacks, which drive the design and functionalities of SCOUT.

Fridman Yu.A.,Taurida National University | Kosmachev O.A.,Taurida National University | Kolezhuk A.K.,Ukrainian Academy of Sciences | Kolezhuk A.K.,Taras Shevchenko National University | Ivanov B.A.,Ukrainian Academy of Sciences
Physical Review Letters | Year: 2011

The ground state phase diagram of a general isotropic spin-32 system with nearest-neighbor exchange is shown to contain unconventionally ordered spin nematic and antinematic states, as well as usual ferro- and antiferromagnetic phases. The two nematic phases have spontaneously broken rotational symmetry characterized by the long-range order of the nematic director u, as well as the broken time-reversal symmetry described by the pseudospin vector σ. Nematic phase differs from antinematic one by the type of ordering in σ vectors (uniform versus staggered). The ferromagnet-nematic and antiferromagnet-antinematic phase boundaries exhibit enhanced Sp(4) symmetry and correspond to the recently studied effective theory for spin-32 cold gases. We discuss optical properties and topological defects in the nematic phases. © 2011 American Physical Society.

Bekshaev A.,Odessa I I Mechnikov National University | Bliokh K.Y.,National University of Ireland | Soskin M.,Ukrainian Academy of Sciences
Journal of Optics | Year: 2011

We review optical phenomena associated with the internal energy redistribution which accompany propagation and transformations of monochromatic light fields in homogeneous media. The total energy flow (linear-momentum density, Poynting vector) can be divided into a spin part associated with the polarization and an orbital part associated with the spatial inhomogeneity. We give a general description of the internal flows in the coordinate and momentum (angular spectrum) representations for both nonparaxial and paraxial fields. This enables one to determine local densities and integral values of the spin and orbital angular momenta of the field. We analyse patterns of the internal flows in standard beam models (Gaussian, Laguerre-Gaussian, flat-top beam, etc), which provide an insightful picture of the energy transport. Emphasis is given to the singular points of the flow fields. We describe the spin-orbit and orbit-orbit interactions in the processes of beam focusing and symmetry breakdown. Finally, we consider how the energy flows manifest themselves in the mechanical action on probing particles and in the transformations of a propagating beam subjected to a transverse perturbation. © 2011 IOP Publishing Ltd.

Naidyuk Y.G.,Ukrainian Academy of Sciences | Gloos K.,University of Turku
Solid State Communications | Year: 2014

Andreev reflection (AR) and Yanson point-contact spectroscopy (PCS) have been applied simultaneously to study the superconducting (SC) gap and the electron-phonon interaction (EPI) in a Zn single crystal. The correlation between SC gap value and EPI spectrum allowed us to establish the anisotropy of the SC gap. Evidence for multiband superconductivity in Zn is present with two gaps related as 1:1.3. We also found that the AR features are more robust against the point-contact quality than the EPI ones, possibly, due to the large coherence length in Zn compared to the typical PC size. Even for the PCs close to the ballistic regime with intense EPI spectra, the transmission coefficient evaluated from the AR spectra is near the one predicted theoretically for the diffusive regime of a current flow in the PC. Understanding those phenomena would provide a more reliable basis to apply both types of spectroscopies to study more complex SCs. © 2014 Elsevier Ltd.

Polishchuk P.G.,Ukrainian Academy of Sciences | Madzhidov T.I.,Kazan Federal University | Varnek A.,University of Strasbourg
Journal of Computer-Aided Molecular Design | Year: 2013

The goal of this paper is to estimate the number of realistic drug-like molecules which could ever be synthesized. Unlike previous studies based on exhaustive enumeration of molecular graphs or on combinatorial enumeration preselected fragments, we used results of constrained graphs enumeration by Reymond to establish a correlation between the number of generated structures (M) and the number of heavy atoms (N): logM = 0.584 × N × logN + 0.356. The number of atoms limiting drug-like chemical space of molecules which follow Lipinsky's rules (N = 36) has been obtained from the analysis of the PubChem database. This results in M ≈ 1033 which is in between the numbers estimated by Ertl (1023) and by Bohacek (1060). © 2013 Springer Science+Business Media Dordrecht.

Yegorova T.,Ukrainian Academy of Sciences | Gobarenko V.,Ukrainian Academy of Sciences | Yanovskaya T.,Saint Petersburg State University
Geophysical Journal International | Year: 2013

The backarc Black Sea (BS) basin was formed in the Late Cretaceous-Palaeocene at the hinterland of the Pontide magmatic arc due to subduction of the Neotethys ocean below the southern Eurasian continental margin.At present the BS consists of two large depressions-the West-and East-Black Sea basins (WBS and EBS) filled with thick (up to 12 km) Cretaceous and younger sediments and underlain by a crust of oceanic/suboceanic type. The sediments mask poorly investigated crystalline crust that is thought to comprise an accretional collage of microplates and terranes of different affinities. To investigate the lithospheric structure of the BS we performed a 3-D gravity analysis and local seismic tomography study. 3-D gravity backstripping analysis allowed us to separate the gravity signal from different parts of the crustal model and then, by subtracting the crustal effect from the observed field, to obtain gravity anomalies of presumed mantle origin only. The broad positive long wavelength component of this might be indicative of good isostatic equilibrium of the deep structure of the Black Sea, that is, that the negative gravity effect of sediments is almost totally compensated by the strong positive gravity impact of Moho shallowing. Velocity structure of the BS lithosphere has been studied by P-wave local seismic tomography. It uses the traveltimes of the earthquakes occurring inside the study region and recorded by permanent seismic stations around the BS. Initial data were corrected for the effect of the crust. The resulting model shows the BS lithosphere as being rather heterogeneous with two domains of increased velocity in its western and eastern parts. The gravity analysis and seismic tomography approaches were integrated by calculating the upper-mantle gravity effect of the tomography model and comparing this to the mantle gravity signature inferred from the gravity analysis itself. The integrated results suggest the presence of rheologically strong and cold continental lithosphere below the BS, similar to Precambrian lithosphere of the East European Platform. © The Authors 2013. Published by Oxford University Press on behalf of The Royal Astronomical Society.

Kushch V.I.,Ukrainian Academy of Sciences | Sevostianov I.,New Mexico State University
International Journal of Solids and Structures | Year: 2015

The paper focuses on the comparison of two approaches used for calculation of the effective elastic properties of particulate composites: the dipole moments representation and the technique based on property contribution tensors. Its specific goal is to bridge the gap between the two methods and to identify the key microstructural parameters affecting overall elastic stiffness of heterogeneous materials. The basic concepts of the homogenization theory including a consistent way of introducing the macroscopic field parameters are discussed and clarified. We provide a detailed comparison of the analytical expressions for the dipole moment tensors obtained by the multipole expansion method and for the stiffness contribution tensors and show that they coincide. © 2014 Elsevier Ltd. All rights reserved.

Kushch V.I.,Ukrainian Academy of Sciences | Sevostianov I.,New Mexico State University
International Journal of Engineering Science | Year: 2014

The paper addresses the homogenization problem for a particulate composite with anisotropic constituents. Its specific goal is to bridge the gap between two different approaches to the problem of homogenization focusing on the anisotropic materials and to identify and discuss the key microstructural parameters affecting overall conductivity of heterogeneous materials. The basic concepts of the homogenization theory including a consistent way of introducing the macroscopic field parameters are discussed and clarified. The exact explicit relations have been obtained between the dipole moments, property contribution tensors and effective conductivity of composite with phase anisotropy of the general type. A detailed comparison of the analytical expressions for the dipole moments obtained by the multipole expansion method and the independently derived expressions for the conductivity contribution tensors has been made between and their equivalence is shown for the matrix type composites with transversely isotropic constituents and spheroidal inhomogeneities. The numerical examples illustrate effect on the overall conductivity of particulate composite of the properties of constituents, shape, volume content, spatial arrangement and orientation of particles.© 2013 Elsevier Ltd. All rights reserved.

Kurter C.,University of Maryland University College | Zhuravel A.P.,Ukrainian Academy of Sciences | Ustinov A.V.,Karlsruhe Institute of Technology | Anlage S.M.,University of Maryland University College
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We investigate the microscopic origins of nonlinear rf response in superconducting electromagnetic resonators. Strong nonlinearity appearing in the transmission spectra at high input powers manifests itself through the emergence of jumplike features near the resonant frequency that evolve toward lower quality factor with higher insertion loss as the rf input power is increased. We directly relate these characteristics to the dynamics of localized normal regions (hot spots) caused by microscopic features in the superconducting material making up the resonator. A clear observation of hot-spot formation inside a Nb thin film self-resonant structure is presented by employing the microwave laser scanning microscope, and a direct link between microscopic and macroscopic manifestations of nonlinearity is established. © 2011 American Physical Society.

Bliokh K.Y.,RIKEN | Bliokh K.Y.,Ukrainian Academy of Sciences | Bekshaev A.Y.,Odessa I I Mechnikov National University | Nori F.,RIKEN | Nori F.,University of Michigan
New Journal of Physics | Year: 2013

The dual symmetry between electric and magnetic fields is an important intrinsic property of Maxwell equations in free space. This symmetry underlies the conservation of optical helicity and, as we show here, is closely related to the separation of spin and orbital degrees of freedom of light (the helicity flux coincides with the spin angular momentum). However, in the standard field-theory formulation of electromagnetism, the field Lagrangian is not dual symmetric. This leads to problematic dual-asymmetric forms of the canonical energy-momentum, spin and orbital angular-momentum tensors. Moreover, we show that the components of these tensors conflict with the helicity and energy conservation laws. To resolve this discrepancy between the symmetries of the Lagrangian and Maxwell equations, we put forward a dual-symmetric Lagrangian formulation of classical electromagnetism. This dual electromagnetism preserves the form of Maxwell equations, yields meaningful canonical energy-momentum and angular-momentum tensors, and ensures a self-consistent separation of the spin and orbital degrees of freedom. This provides a rigorous derivation of the results suggested in other recent approaches. We make the Noether analysis of the dual symmetry and all the Poincaré symmetries, examine both local and integral conserved quantities and show that only the dual electromagnetism naturally produces a complete self-consistent set of conservation laws. We also discuss the observability of physical quantities distinguishing the standard and dual theories, as well as relations to quantum weak measurements and various optical experiments. © IOP Publishing and Deutsche Physikalische Gesellschaft.

Shapoval O.V.,Ukrainian Academy of Sciences | Sauleau R.,University of Rennes 1 | Nosich A.I.,Ukrainian Academy of Sciences
IEEE Transactions on Nanotechnology | Year: 2013

The surface plasmon and the periodicity-induced resonances in the scattering and absorption of light by multiple flat nanosize noble-metal strips are investigated using a new efficient model. It exploits the fact that the nanostrip thickness is a small fraction of the wavelength in the visible range. This justifies shrinking the strip cross section to its median line and using the generalized boundary conditions on that line, with the strip thickness entering the coefficients. As a result, the scattering problem is reduced to the singular and hypersingular integral equations. We discretize them using quadrature formulas of interpolation type and build an algorithm having guaranteed convergence and controlled accuracy of computations. It enables fast simulation of structures consisting of many noble-metal strips. Near- and far-field characteristics for finite flat grating of silver and gold nanostrips are presented. © 2002-2012 IEEE.

Bliokh K.Y.,RIKEN | Bliokh K.Y.,Ukrainian Academy of Sciences | Bekshaev A.Y.,RIKEN | Bekshaev A.Y.,Odessa I I Mechnikov National University | And 3 more authors.
Nature Communications | Year: 2014

Momentum and spin represent fundamental dynamic properties of quantum particles and fields. In particular, propagating optical waves (photons) carry momentum and longitudinal spin determined by the wave vector and circular polarization, respectively. Here we show that exactly the opposite can be the case for evanescent optical waves. A single evanescent wave possesses a spin component, which is independent of the polarization and is orthogonal to the wave vector. Furthermore, such a wave carries a momentum component, which is determined by the circular polarization and is also orthogonal to the wave vector. We show that these extraordinary properties reveal a fundamental Belinfante's spin momentum, known in field theory and unobservable in propagating fields. We demonstrate that the transverse momentum and spin push and twist a probe Mie particle in an evanescent field. This allows the observation of 'impossible' properties of light and of a fundamental field-theory quantity, which was previously considered as 'virtual'. © 2014 Macmillan Publishers Limited. All rights reserved.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: SPA.2013.3.2-01 | Award Amount: 2.91M | Year: 2013

The total mass of space debris in the low Earth orbit region is estimated to be close to 2,500 tons. About half of this mass is composed by rocket upper stages clustered in high inclination orbital regions. Because they are grouped in a relatively small number of families, acquiring the capability to deorbit just a few upper stage types would lead the way towards the elimination of hundreds of tons of debris material in the future. The goal of the LEOSWEEP project (improving Low Earth Orbit Security With Enhanced Electric Propulsion) is to demonstrate the technological feasibility of a first active removal mission of a Ukrainian rocket upper stage, prove its economic viability, and propose a convincing legal and policy implementation to kick-start large-scale active debris removal activities in Ukraine, Europe and other space faring nations in the future. The recently proposed Ion Beam Shepherd (IBS) concept is employed as the key removal technology where the use of ionic beams provide an efficient and low-risk contactless manipulation of the debris to be deorbited. In order to prove the feasibility of the proposed solution and prepare for its future implementation a series of key milestones will be achieved: (1) a detailed understanding of the physics underlining the concept, (2) the identification of key technological challenges and concrete solutions (3) the assessment of the concept capability in dealing with large-scale removal operations (4) the development of ground-based laboratory experiments, (5) the definition of a clear technology and policy development roadmap, (6) the pre-phase A design of a small technology demonstration mission and (7) the exploitation and dissemination of the proposal outcomes. A world-class international team of universities and industrial partners from Europe and Ukraine has been formed in order to perform this study with a high level of theoretical and technical expertise in all relevant fields.

Gol'Din P.,Taurida National University | Zvonok E.,Ukrainian Academy of Sciences
Journal of Paleontology | Year: 2013

A new basal basilosaurid cetacean, Basilotritus uheni n. gen. n. sp., comes from the late middle Eocene (Bartonian) of Ukraine. It is the earliest dated record of a cetacean from Eastern Europe. The tympanic bulla of Basilotritus uheni shares basilosaurid synapomorphies but possesses unusual traits inherited from protocetids. Cetaceans related to Basilotritus uheni and referred to as Eocetus or "Eocetus" have been recorded from Africa, Europe, North America and South America. "Eocetus" wardii from North America is recombined as Basilotritus wardii. Platyosphys paulsonii and Platyosphys einori from Ukraine are considered as nomina dubia; specimens prior referred to as Platyosphys sp. are similar or related to Basilotritus. Other records of the Eocene cetaceans from Ukraine and south Russia are identified as Basilotritus or related genera. Early basilosaurids are demonstrated to be a paraphyletic, morphologically and geographically diverse group of the genera that colonized the world ocean as late as in Bartonian age and were probably the ancestors of Neoceti, as well as of more derived basilosaurids. Copyright © 2013, The Paleontological Society.

Agency: European Commission | Branch: H2020 | Program: CSA | Phase: INT-01-2015 | Award Amount: 999.93K | Year: 2016

The overall aim of the project entitled Strengthening Research and Innovation Links towards Ukraine (abbr. RI-LINKS2UA) is to further support and enhance the integration of Ukraine to the European Research Area. The following three core objectives will be archived by a consortium of 12 renewed organisations with professional STI policy and policy analysis background from EU MS /AC (including Ukraine of course): to further support and stimulate the policy dialogue on R&I between EU and Ukraine and therefore to enable the better integration of Ukraine into ERA, by identifying remaining obstacles, drivers and opportunities through analytical evidence and R&I policy advice; to contribute to the improvement of supportive framework conditions in the field of R&I through a targeted portfolio of activities in order to systematically enhance and stimulate the EU-Ukraine STI cooperation; to further encourage and facilitate cooperation between research actors from the EU and Ukraine through a set of supportive R&I measures and by promoting EU-Ukrainian participation in joint projects in Horizon 2020 and other EU funded programmes. In particular RI-LINKS2UA will: Contribute to the improvement of the framework conditions for EU-Ukraine STI cooperation Provide an operational tailor-made support to policy dialogue Strengthen innovation capacity and economic competitiveness Stimulate and promote the R&I cooperation between EU and Ukraine Contribute to the governance of Ukrainian participation in the Horizon 2020 and assure practical follow up and long-term impacts by applying diligent dissemination and valorisation precautions. RI-LINKS2UA is supported by ministries responsible for research from 7 EU MS as well as by core members of the projects consortium from Ukraine, namely the Ministry of Education and Science of Ukraine and National Academy of Sciences. The proposed activities build up on the results of previous EU funded support projects with Ukraine.

Agency: European Commission | Branch: H2020 | Program: CSA | Phase: INT-02-2014 | Award Amount: 1.50M | Year: 2015

BLACK SEA HORIZON has been designed to sustainably enhance bi-regional STI cooperation between the EU and the Black Sea region. The result of the projects STI dialogue support will be an improved knowledge base about EUs external environment and of the current framework for STI cooperation as well as an increased awareness to contribute to the elimination of remaining obstacles and to further intensify the bi-regional STI cooperation based on a jointly developed EU-Black Sea STI Cooperation Programme. To facilitate the pooling of resources the project will establish a group of committed funding parties, endowed with a functional call infrastructure and a clear set of rules and regulations, ready to implement a joint call for proposals. The participation of Black Sea researchers in HORIZON 2020 will be operationally facilitated through (i) identified common research topics taken-up in future calls for proposals, (ii) provision of up-to-date relevant information and good practices to participate in HORIZON 2020 to a large group of researchers, (iii) an increased number of joint research proposals through direct face-to-face meetings of, (iv) a young generation of social scientists trained in HORIZON 2020 and ready to promote and back up future RTI cooperation and (v) an increased readiness of programme owners both from the EU and Black Sea countries to engage jointly in JPIs and future COFUND ERA-NETs. Furthermore, the project will increase understanding of cluster policies and cluster management, establish direct business contacts between cluster managers from the EU and target countries and raise awareness on the programming of as well as on the advantages of inclusive, sustainable and social innovation. The projects results will be broadly disseminated to increase awareness on bi-region STI cooperation activities and opportunities and will be exploited towards an enhanced introduction of the Black Sea region to the ERA.

Agency: European Commission | Branch: FP7 | Program: CSA-SA | Phase: SPA.2010.1.1-01 | Award Amount: 591.65K | Year: 2011

The overall objective of the project is twofold, first to turn a pan-European river discharge model into operational use and thereby acting as a downstream service based on earlier developed GMES core services and at the same time stimulating the development and improvement of new downstream services. This objective will be achieved by extending an already running operational river discharge model (HYPE) for the Baltic Sea drainage basin to cover all European rivers. A sustainable operational system will be built up to respond to GMES downstream services like coastal ocean models, regional environmental commissions like HELCOM and OSPAR, regional and national operational institutes, environmental protection agencies, fishery boards, water regulation bodies and SMEs working in this area. The second objective is the validation of observed river discharge and the river discharge estimates produced by the project in applications of shelf sea ocean.

Agency: European Commission | Branch: H2020 | Program: CSA | Phase: INT-02-2015 | Award Amount: 1.57M | Year: 2016

The project STI International Cooperation Network for EaP Countries Plus (EaP PLUS) aims to stimulate cooperation between researchers from the EaP countries and EU MS and enhance the active participation of the Eastern Partnership countries in Horizon 2020 Framework Programme. Building on the results of the predecessor FP7 project IncoNet EaP, the project will eliminate remaining obstacles to EU-EaP STI cooperation through a number of innovative and targeted actions: (a) strategic priority setting through supporting EU-EaP policy dialogue and through maximizing the impact of the association to Horizon 2020; (b) stronger interaction between researchers & participation in H2020, i.e. Info days, cooperation with scientific diaspora, and grants for networking; (c) promotion of the research-innovation interface supporting communities of excellence, i.e. co-patenting analyses, clustering schemes, promotion of the technology platforms concept to EaP countries; (d) optimal framework conditions and increasing coordination in policies and programmes through training seminars for STI policymakers, increased coordination and synergies between policies and programmes of EU/MS and EaP, i.e. JPIs, COST, national programmes; (e) communication and outreach through innovative actions

Izotov Y.I.,Ukrainian Academy of Sciences | Thuan T.X.,University of Virginia | Guseva N.G.,Ukrainian Academy of Sciences
Monthly Notices of the Royal Astronomical Society | Year: 2014

We present near-infrared (NIR) spectroscopic observations of the high-intensity He I λ10830 Å emission line in 45 low-metallicity HII regions. We combined these NIR data with spectroscopic data in the optical range to derive the primordial He abundance. The use of the He I λ10830 Å line, the intensity of which is very sensitive to the density of the HII region, greatly improves the determination of the physical conditions in the He+ zone. This results in a considerably tighter Y-O/H linear regression compared to all previous studies.We extracted a final sample of 28 HII regions with Hβ equivalent width EW(Hβ) = 150 Å, excitation parameter O2 +/O = 0.8, and with helium mass fraction Y derived with an accuracy better than 3 per cent. With this final sample we derived a primordial 4He mass fraction Yp = 0.2551 ± 0.0022. The derived value of Yp is higher than the one predicted by the standard big bang nucleosynthesis model. Using our derived Yp together with D/H = (2.53 ± 0.04) × 10-5, and the x2 technique, we found that the best agreement between these light element abundances is achieved in a cosmological model with a baryon mass density Ωbh2 = 0.0240 ± 0.0017 (68 per cent confidence level, CL), ± 0.0028 (95.4 per cent CL), ± 0.0034 (99 per cent CL) and an effective number of neutrino species Neff = 3.58 ± 0.25 (68 per cent CL), ± 0.40 (95.4 per cent CL), ± 0.50 (99 per cent CL). A non-standard value of Neff is preferred at the 99 per cent CL, implying the possible existence of additional types of neutrino species. © 2014 The Authors.

Pilyugin L.S.,Ukrainian Academy of Sciences | Thuan T.X.,University of Virginia
Astrophysical Journal Letters | Year: 2011

The oxygen and nitrogen abundance evolutions with redshift of emission-line galaxies in the Sloan Digital Sky Survey are considered for four intervals of galaxy stellar masses, ranging from 1011.3 M⊙ to 1010.2 M⊙. We have measured their line fluxes and derived the O and N abundances using recent calibrations. The evolution of O and N abundances with redshift clearly shows the galaxy downsizing effect, where enrichment (and hence star formation) ceases in high-mass galaxies at earlier times and shifts to lower-mass galaxies at later epochs. The origin of the scatter in the N/H-O/H diagram has been examined. The most massive galaxies, where O and N enrichment and star formation have already stopped, occupy a narrow band in the N/H-O/H diagram, defining an upper envelope. The less massive galaxies which are still undergoing star formation at the current epoch are shifted downward, toward lower N/H values in the N/H-O/H diagram. This downward shift is caused by the time delay between N and O enrichment. This time delay together with the different star formation histories in galaxies is responsible for the large scatter in the N/H-O/H diagram. © 2011. The American Astronomical Society. All rights reserved. Printed in the U.S.A.

Izotov Y.I.,Ukrainian Academy of Sciences | Thuan T.X.,University of Virginia
Astrophysical Journal Letters | Year: 2010

We present a new determination of the primordial helium mass fraction Yp , based on 93 spectra of 86 low-metallicity extragalactic H II regions, and taking into account the latest developments concerning systematic effects. These include collisional and fluorescent enhancements of He I recombination lines, underlying He I stellar absorption lines, collisional and fluorescent excitation of hydrogen lines, and temperature and ionization structure of the H II region. Using Monte Carlo methods to solve simultaneously for the above systematic effects, we find the best value to be Yp = 0.2565 ± 0.0010 (stat.) ± 0.0050 (syst.). This value is higher at the 2σ level than the value given by standard big bang nucleosynthesis, implying deviations from it. The effective number of light neutrino species N ν is equal to 3.68+0.80 -0.70 (2σ) and 3.80+0.80 -0.70 (2σ) for a neutron lifetime τn equal to 885.4 ± 0.9 s and 878.5 ± 0.8 s, respectively, i.e., it is larger than the experimental value of 2.993 ± 0.011. © 2010. The American Astronomical Society. All rights reserved.

Ahn H.-Y.,University of Central Florida | Fairfull-Smith K.E.,Queensland University of Technology | Morrow B.J.,Queensland University of Technology | Lussini V.,Queensland University of Technology | And 4 more authors.
Journal of the American Chemical Society | Year: 2012

A range of varying chromophore nitroxide free radicals and their nonradical methoxyamine analogues were synthesized and their linear photophysical properties examined. The presence of the proximate free radical masks the chromophore's usual fluorescence emission, and these species are described as profluorescent. Two nitroxides incorporating anthracene and fluorescein chromophores (compounds 7 and 19, respectively) exhibited two-photon absorption (2PA) cross sections of approximately 400 G.M. when excited at wavelengths greater than 800 nm. Both of these profluorescent nitroxides demonstrated low cytotoxicity toward Chinese hamster ovary (CHO) cells. Imaging colocalization experiments with the commercially available CellROX Deep Red oxidative stress monitor demonstrated good cellular uptake of the nitroxide probes. Sensitivity of the nitroxide probes to H 2O 2-induced damage was also demonstrated by both one- and two-photon fluorescence microscopy. These profluorescent nitroxide probes are potentially powerful tools for imaging oxidative stress in biological systems, and they essentially "light up" in the presence of certain species generated from oxidative stress. The high ratio of the fluorescence quantum yield between the profluorescent nitroxide species and their nonradical adducts provides the sensitivity required for measuring a range of cellular redox environments. Furthermore, their reasonable 2PA cross sections provide for the option of using two-photon fluorescence microscopy, which circumvents commonly encountered disadvantages associated with one-photon imaging such as photobleaching and poor tissue penetration. © 2012 American Chemical Society.

Izotov Y.I.,Ukrainian Academy of Sciences | Guseva N.G.,Ukrainian Academy of Sciences | Thuan T.X.,University of Virginia
Astrophysical Journal | Year: 2011

We present a large sample of 803 star-forming luminous compact galaxies (LCGs) in the redshift range z = 0.02-0.63, selected from Data Release 7 of the Sloan Digital Sky Survey (SDSS). The global properties of these galaxies are similar to those of the so-called green pea star-forming galaxies in the redshift range z = 0.112-0.360 and selected from the SDSS on the basis of their green color and compact structure. In contrast to green pea galaxies, our LCGs are selected on the basis of both their spectroscopic and photometric properties, resulting in a ∼ 10 times larger sample, with galaxies spanning a redshift range ≳2 times larger. We find that the oxygen abundances and the heavy element abundance ratios in LCGs do not differ from those of nearby low-metallicity blue compact dwarf galaxies. The median stellar mass of LCGs is ∼109 M⊙. However, for galaxies with high EW(Hβ), ≤ 100 Å, it is only ∼7 × 108 M ̇. The star formation rate in LCGs varies in the large range of 0.7-60 M⊙ yr-1, with a median value of ∼4 M ⊙ yr-1, a factor of ∼3 lower than in high-redshift star-forming galaxies at z ≳ 3. The specific star formation rates in LCGs are extremely high and vary in the range ∼10 -9-10-7 yr-1, comparable to those derived in high-redshift galaxies. © 2011. The American Astronomical Society.

Izotov Y.I.,Ukrainian Academy of Sciences | Thuan T.X.,University of Virginia
Astrophysical Journal | Year: 2011

We present near-infrared (NIR) spectroscopic observations of five blue compact dwarf (BCD) galaxies, IIZw40, Mrk71, Mrk930, Mrk996, and SBS0335-052E. The NIR spectra which cover the 0.90-2.40 μm wavelength range show hydrogen, molecular hydrogen, helium, sulfur, and iron emission lines. The NIR data for all BCDs have been supplemented by optical spectra. We found the extinction coefficient in all BCDs to be very similar in both the optical and NIR ranges. The NIR hydrogen emission lines do not reveal more star formation than seen in the optical. The same conclusion is reached from Spitzer data concerning the mid-infrared (MIR) emission lines. This implies that emission line spectra of low-metallicity BCDs in the ∼0.36-25 μm wavelength range are emitted by relatively transparent ionized gas. The large extinction derived from the MIR continuum emission in some BCDs implies that the latter arises not from the visible H II regions themselves, but from locations outside these H II regions. The H2 emission line fluxes can be accounted for by fluorescence. CLOUDY stellar photoinization models of all BCDs reproduce well the fluxes of most of the observed optical and NIR emission lines, except in Mrk930 where shock ionization is needed to account for the [Fe II] emission lines. However, some contribution of shock ionization at the level of ≲10% that of stellar ionization is required to reproduce the observed fluxes of high ionization species, such as He II λ0.469 μm in the optical range and [O IV] λ25.89 μm in the MIR range. © 2011. The American Astronomical Society. All rights reserved.

Schlottmann P.,Florida State University | Zvyagin A.A.,Ukrainian Academy of Sciences | Zvyagin A.A.,Max Planck Institute For Physik Komplexer Systeme
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

A gas of ultracold 6Li atoms (effective spin 1/2) confined to an elongated trap with one-dimensional properties is a candidate to display three different phases: (i) fermions bound in Cooper-pair-like states, (ii) unbound spin-polarized particles, and (iii) a mixed phase in which Cooper bound states and unpaired particles coexist. It is of great interest to extend these studies to fermionic atoms with higher spin, e.g., for neutral 40K, 43Ca, 87Sr, or 173Yb atoms. Within the grand-canonical ensemble, we investigated the μ versus H phase diagram (μ is the chemical potential and H the external magnetic field) for S=3/2,...,9/2 for the ground state using the exact Bethe ansatz solution of the one-dimensional Fermi gas with an attractive δ-function interaction potential. There are N=2S+1 fundamental states: the particles can be either unpaired or clustered in bound states of 2, 3, 2S, and 2S+1 fermions. The rich phase diagram consists of these N states and various mixed phases in which combinations of the fundamental states coexist. Bound states of N fermions are not favorable in high magnetic fields, but always present if the field is low. For S=3/2, possible scenarios for phase separation are explored within the local density approximation. For S=3/2, the phase diagram for the superposition of a Zeeman and a quadrupolar splitting is also discussed. © 2012 American Physical Society.

Schlottmann P.,Florida State University | Zvyagin A.A.,Ukrainian Academy of Sciences | Zvyagin A.A.,Max Planck Institute For Physik Komplexer Systeme
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

In the context of a gas of ultracold atoms with effective spin S=3/2 confined to an elongated trap, we study the one-dimensional Fermi gas interacting via an attractive δ-function potential within the grand-canonical ensemble. The particles can be either unbound or clustered in bound states of two, three, and four fermions. The rich μ versus H ground-state phase diagram (μ is the chemical potential and H the external magnetic field) consists of the four basic states and the various possible mixed phases in which some these states coexist. Extending the analysis of K. Yang for S=1/2, we study the correlation functions of the generalized Cooper clusters of bound states of two, three, and four particles using conformal field theory and the exact Bethe Ansatz solution. The correlation functions consist of a power law with distance times a sinusoidal term oscillating with distance. In an array of tubes with weak Josephson tunneling, the type of superfluid order is determined by these correlation functions. The wavelength of the oscillations is related to the periodicity of a generalized Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state for higher spin particles. All the relevant states are analyzed for S=3/2. © 2012 American Physical Society.

Thuan T.X.,University of Virginia | Pilyugin L.S.,Ukrainian Academy of Sciences | Zinchenko I.A.,Ukrainian Academy of Sciences
Astrophysical Journal | Year: 2010

The oxygen and nitrogen abundance evolutions with redshift and galaxy stellar mass in emission-line galaxies from the Sloan Digital Sky Survey (SDSS) are investigated. This is the first such study for nitrogen abundances, and it provides an additional constraint for the study of the chemical evolution of galaxies. We have devised a criterion to recognize and exclude from consideration active galactic nuclei and star-forming galaxies with large errors in the line flux measurements. To select star-forming galaxies with accurate line fluxes measurements, we require that, for each galaxy, the nitrogen abundances derived with various calibrations based on different emission lines agree. Using this selection criterion, subsamples of star-forming SDSS galaxies have been extracted from catalogs of the Max-Planck-Institute for Astrophysics/Johns Hopkins University group. We found that the galaxies of highest masses, those with masses ≳1011.2 M ⊙, have not been enriched in both oxygen and nitrogen over the last 3 Gyr: they have formed their stars in the so distant past that these have returned their nucleosynthesis products to the interstellar medium before z = 0.25. The galaxies in the mass range from 1011.0M ⊙ to 10 11.2M ⊙ do not show an appreciable enrichment in oxygen, but do show some enrichment in nitrogen: they also formed their stars before z = 0.25 but later in comparison to the galaxies of highest masses; these stars have not returned nitrogen to the interstellar medium before z = 0.25 because they have not had enough time to evolve. This suggests that stars with lifetimes of 2-3 Gyr, in the 1.5-2 M ⊙ mass range, contribute to the nitrogen production. Finally, galaxies with masses ≲1011 M ⊙ show enrichment in both oxygen and nitrogen during the last 3 Gyr: they have undergone appreciable star formation and have converted up to 20% of their mass into stars over this period. Both oxygen and nitrogen enrichments increase with decreasing galaxy stellar mass in the mass range from 10 11 M ⊙ to 1010 M ⊙, then slightly decrease with further decrease of galaxy mass. © 2010. The American Astronomical Society. All rights reserved.

Pilyugin L.S.,Ukrainian Academy of Sciences | Pilyugin L.S.,University of Heidelberg | Grebel E.K.,University of Heidelberg | Mattsson L.,Copenhagen University
Monthly Notices of the Royal Astronomical Society | Year: 2012

We suggest a new way of determining abundances and electron temperatures in Hii regions from strong emission lines. Our approach is based on the standard assumption that Hii regions with similar intensities of strong emission lines have similar physical properties and abundances. A 'counterpart' for a studied Hii region may be chosen among Hii regions with well-measured abundances (reference Hii regions) by comparison of carefully chosen combinations of strong-line intensities. Then the abundances in the investigated Hii region can be assumed to be the same as those in its counterpart. In other words, we suggest to determine the abundances in Hii regions 'by precedent'. To get more reliable abundances for the considered Hii region, a number of reference Hii regions are selected and then the abundances in the target Hii region are estimated through extrapolation/interpolation. We will refer to this method of abundance determination as the counterpart method or, for brevity, the C method. We define a sample of reference Hii regions and verify the validity of the C method. We find that this method produces reliable abundances. Finally, the C method is used to obtain the radial abundance distributions in the extended discs of the spiral galaxies M83, NGC4625 and NGC628. © 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS.

Pilyugin L.S.,Ukrainian Academy of Sciences | Vilchez J.M.,Institute Astrofisica Of Andalucia | Thuan T.X.,University of Virginia
Astrophysical Journal | Year: 2010

New improved empirical calibrations for the determination of electron temperatures and oxygen and nitrogen abundances in H II regions from the strong emission lines of oxygen, nitrogen, and sulfur are given. They are derived using spectra of H II regions with measured electron temperatures as calibrating data. Calibration relations are given separately for three classes of H II regions: cool, warm, and hot ones. Criteria for assigning a H II region to one of these classes are suggested. We find that classification ambiguities arise only in the case of hot H II regions with enhanced nitrogen abundances. The derived calibrations provide reliable abundances for H II regions: the mean difference between oxygen abundances determined from the calibrations and T e-based oxygen abundances is ∼0.075 dex, while it is ∼0.05 dex for nitrogen abundances. © 2010. The American Astronomical Society.

Blocki J.P.,National Center for Nuclear Research | Magner A.G.,Ukrainian Academy of Sciences
Physical Review C - Nuclear Physics | Year: 2012

Statistics of the single-particle levels in a deformed axially symmetric Woods-Saxon potential is analyzed in terms of the Poisson and Wigner nearest-neighbor spacing distributions for several deformations and multipolarities of the surface distortions. We found the significant differences of all the distributions with a fixed value of the angular momentum projection of the particle on the symmetry axis, more closely to the Wigner distribution, in contrast to the full spectra with Poisson-like behavior. The shell effects in the nearest-neighbor spacing distributions, for both small and large deformations of the surface are analyzed. © 2012 American Physical Society.

Tomin V.I.,Pomeranian University | Demchenko A.P.,Ukrainian Academy of Sciences | Chou P.-T.,National Taiwan University
Journal of Photochemistry and Photobiology C: Photochemistry Reviews | Year: 2015

The "Excited-State Intramolecular Proton Transfer" (ESIPT) reactions in a number of organic fluorophores are among the fastest basic chemical reactions known so far and their rates can be observed even on femtosecond time scale. Accordingly, the reactant concentration, as monitored by its emission, should be negligibly small. In sharp contrast to this conventional wisdom, however, the coexistence of the reactant and the product of this reaction is so frequently observed in condensed media. We then discuss two possible origins of these effects: when the ESIPT reaction is perturbed and hence is slow on the time scale of emission (kinetic control) or when the reverse reaction repopulating the reactant state is fast and leads to the excited-state equilibrium (thermodynamic control). Upon reviewing a great number of ESIPT prototypical systems, we summarize and discuss different criteria for distinguishing these cases based on the steady-state and time-resolved spectroscopic studies and derive correlations between reversibility of these reactions and the solvent-dependent effects observed in fluorescence spectra. © 2014 Elsevier B.V.

Dvoynenko M.M.,Ukrainian Academy of Sciences | Dvoynenko M.M.,Institute of Atomic and Molecular science | Wang J.-K.,National Taiwan University | Wang J.-K.,Institute of Atomic and Molecular science
Optics Letters | Year: 2013

Strong coupling between a single molecule and surface plasmons is reexamined with a microscopic classical formulation in local and nonlocal responses of metal. In the case of local response, we show that strong single molecule-plasmon coupling can occur in the UV range for a silver particle with a molecule-metal separation of 1 nm or smaller, where the real part of the dielectric function of silver approaches -1. With the nonlocal response consideration, strong coupling happens at shorter molecule-metal distances. The result shows that Rabi splitting can occur even without a resonator. © 2013 Optical Society of America.

Roth W.J.,J. Heyrovsky Institute of Physical Chemistry | Nachtigall P.,Charles University | Morris R.E.,University of St. Andrews | Wheatley P.S.,University of St. Andrews | And 8 more authors.
Nature Chemistry | Year: 2013

The properties of zeolites, and thus their suitability for different applications, are intimately connected with their structures. Synthesizing specific architectures is therefore important, but has remained challenging. Here we report a top-down strategy that involves the disassembly of a parent zeolite, UTL, and its reassembly into two zeolites with targeted topologies, IPC-2 and IPC-4. The three zeolites are closely related as they adopt the same layered structure, and they differ only in how the layers are connected. Choosing different linkers gives rise to different pore sizes, enabling the synthesis of materials with predetermined pore architectures. The structures of the resulting zeolites were characterized by interpreting the X-ray powder-diffraction patterns through models using computational methods; IPC-2 exhibits orthogonal 12-and ten-ring channels, and IPC-4 is a more complex zeolite that comprises orthogonal ten-and eight-ring channels. We describe how this method enables the preparation of functional materials and discuss its potential for targeting other new zeolites. © 2013 Macmillan Publishers Limited. All rights reserved.

Izotov Y.I.,Ukrainian Academy of Sciences | Thuan T.X.,University of Virginia | Privon G.,University of Virginia
Monthly Notices of the Royal Astronomical Society | Year: 2012

We report the discovery of the high-ionization [Ne v] λ3426Å emission line in the spectra of five blue compact dwarf (BCD) galaxies. Adding the three previously known BCDs with [Ne v] emission, the entire sample of such galaxies now contains eight objects. The detection of this line implies the presence of intense hard ionizing radiation. Such radiation cannot be reproduced by models of high-mass X-ray binaries or massive stellar populations. Other mechanisms, such as active galactic nucleus (AGN) and/or fast radiative shocks, are needed. We consider that fast radiative shocks are the most likely mechanism. The observed [Ne v] λ3426/Heii λ4686 flux ratios in all eight galaxies can be reproduced by radiative shock models with shock velocities in the ∼300-500kms -1 range, and with the shock ionizing contribution being ∼10 per cent of the stellar ionizing contribution. However, we cannot rule out that this 10 per cent part is produced by an AGN rather than by radiative shocks. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.

Roth W.J.,J. Heyrovsky Institute of Physical Chemistry | Shvets O.V.,Ukrainian Academy of Sciences | Shamzhy M.,Ukrainian Academy of Sciences | Chlubna P.,J. Heyrovsky Institute of Physical Chemistry | And 3 more authors.
Journal of the American Chemical Society | Year: 2011

Mild treatment of zeolite UTL results in degradation of its structure with preservation of the initially present dense layers connected by D4R bridges. The lamellar product obtained through this 3D to 2D zeolite conversion has been structurally modified similar to methodologies applied to layered zeolite precursors, which show the opposite 2D to 3D zeolite transformation. © 2011 American Chemical Society.

Kumar A.,Oak Ridge National Laboratory | Ciucci F.,University of Heidelberg | Morozovska A.N.,Ukrainian Academy of Sciences | Kalinin S.V.,Oak Ridge National Laboratory | Jesse S.,Oak Ridge National Laboratory
Nature Chemistry | Year: 2011

The efficiency of fuel cells and metal - air batteries is significantly limited by the activation of oxygen reduction and evolution reactions. Despite the well-recognized role of oxygen reaction kinetics on the viability of energy technologies, the governing mechanisms remain elusive and until now have been addressable only by macroscopic studies. This lack of nanoscale understanding precludes optimization of material architecture. Here, we report direct measurements of oxygen reduction/evolution reactions and oxygen vacancy diffusion on oxygen-ion conductive solid surfaces with sub-10 nm resolution. In electrochemical strain microscopy, the biased scanning probe microscopy tip acts as a moving, electrocatalytically active probe exploring local electrochemical activity. The probe concentrates an electric field in a nanometre-scale volume of material, and bias-induced, picometre-level surface displacements provide information on local electrochemical processes. Systematic mapping of oxygen activity on bare and platinum-functionalized yttria-stabilized zirconia surfaces is demonstrated. This approach allows direct visualization of the oxygen reduction/evolution reaction activation process at the triple-phase boundary, and can be extended to a broad spectrum of oxygen-conductive and electrocatalytic materials. © 2011 Macmillan Publishers Limited. All rights reserved.

Hunt L.K.,National institute for astrophysics | Thuan T.X.,University of Virginia | Izotov Y.I.,Ukrainian Academy of Sciences | Sauvage M.,CEA Saclay Nuclear Research Center
Astrophysical Journal | Year: 2010

We present low- and high-resolution Spitzer/IRS spectra, supplemented by Infrared Array Camera and Multiband Imaging Photometer for Spitzer measurements, of 22 blue compact dwarf (BCD) galaxies. The BCD sample spans a wide range in oxygen abundance (12+log(O/H) between 7.4 and 8.3), and hardness of the interstellar radiation field (ISRF). The Infrared Spectrograph (IRS) spectra provide us with a rich set of diagnostics to probe the physics of star and dust formation in very low metallicity environments. We find that metal-poor BCDs have harder ionizing radiation than metal-rich galaxies: [OIV] emission is ≳4 times as common as [FeII] emission. They also have a more intense ISRF, as indicated by the 71 to 160μm luminosity ratio. Two-thirds of the sample (15 BCDs) show polycyclic aromatic hydrocarbon (PAH) features, although the fraction of PAH emission normalized to the total infrared (IR) luminosity is considerably smaller in metal-poor BCDs (∼0.5%) than in metal-rich star-forming galaxies (∼10%). We find several lines of evidence for a deficit of small PAH carriers at low metallicity, and attribute this to destruction by a hard, intense ISRF, only indirectly linked to metal abundance. Our IRS spectra reveal a variety of H2 rotational lines, and more than a third of the objects in our sample (eight BCDs) have ≳3σ detections in one or more of the four lowest-order transitions. The warm gas masses in the BCDs range from 103 M ⊙ to 10 8M ⊙, and can be comparable to the neutral hydrogen gas mass; relative to their total IR luminosities, some BCDs contain more H 2 than Spitzer Nearby Galaxy Survey galaxies. © 2010. The American Astronomical Society.

Agency: European Commission | Branch: FP7 | Program: CSA-SA | Phase: INCO.2011-6.1 | Award Amount: 554.21K | Year: 2011

The Nanotwinning Project is aimed at one of FP7 Thematic priorities - Nanosciences, Nanotechnologies, Materials & new Production Technologies. The project provides a number of events, which are focused on increasing opportunities for collaboration in the field of nanotechnology via twining of IOP with institutions of ERA. The Institute of Physics of the National Academy of Sciences of Ukraine (IOP) is the coordinator of the Project. European partners of Nanotwinning Project, namely Pierre and Marie Curie University (France), the University of Torino(Italy), the University of Tartu (Estonia) are well recognized in the world in the field of nanotechnology and European Profiles (Greece) will assist in creation of strategic plan of development of the IOP. There are 5 Work packages (WPs) provided in the Nanotwinning Project: the 1st WP is aimed at general coordination, achievement of all project milestones and implementation of the Project. The 2nd WP is an integration of scientists of IOP in ERA by experience exchange, creation of joined Surface enhanced spectroscopy laboratory and holding of Nanobiophysics conference. The 3rd WP provides involvement of youth into promising directions of research by open days in the Institute, issuance of short-term grants for training, travel grants for participation in conferences and holding of international summer school Nanotechnology: a Hands-On Experience with Fundamental Background and ways of raising Finance in the science. The 4th WP is the search for ways of additional funding attraction into science and innovations it is planned to hold short-term theme workshops, technological meetings, where not only representatives of science and external experts, but also representatives of business will be involved. On the last stage (WP5) the system of strategic management of IOP will be improved by creation of plan of the Institute sustainability for the next 5 years.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: Fission-2011-3.1.1 | Award Amount: 4.91M | Year: 2011

The major elements of scientific uncertainty in the context of radiation protection policy and of risk assessment for cerebrovascular diseases, set the following key topics (1) the direct assessment of health effects through epidemiological studies of groups exposed to low doses, (2) doses-response and biological effects from different types of radiation and (3) the biological processes in cells and tissues mediating the cerebrovascular effects of low-dose radiation. These 3 topics have been identified as priorities by the HLEG, the MELODI Strategic Agenda and ARCH (Agenda for Research on Chernobyl Health), and will be covered in the CEREBRAD (Cognitive and Cerebrovascular Effects Induced by Low Dose Ionising Radiation) project. CEREBRAD will address the problem of cerebrovascular effects in humans: in individuals that were exposed in utero, in cohorts of adults from the Chernobyl liquidators, and in children receiving low doses to the brain during cancer radiotherapy. We will study cognitive effects in animal models exposed to radiation at different stages of brain development, with special emphasis on early postnatal exposures, and will examine the initial and late effects induced in brain by irradiation at the cellular and molecular levels. The main concern of CEREBRAD is to identify the potential risk of doses below 100 mGy delivered to a young child. To inform on risk estimates of the effect from internal and external exposures, as well as synergistic effect with other environmental pollutants, all these different conditions will be evaluated. The consortium is an interdisciplinary team of radiobiologists, epidemiologists, experts in neurodegenerative diseases, genomics, proteomics and bioinformatics, paediatricians and dosimetrists. Special attention will be paid to efficient project management, training, dissemination and communication with stakeholders and the general public.

Agency: European Commission | Branch: FP7 | Program: CSA-CA | Phase: Fission-2007-4.1-03 | Award Amount: 1.75M | Year: 2008

This proposal is for continued support for a high quality tissue bank of clinically and pathologically annotated biological samples from patients who have developed thyroid tumours following exposure to radiation from the Chernobyl nuclear accident. It not only provides biological material to researchers world-wide but will collate research data from all projects using the resource in a web-accessible data warehouse, and provide a suite of bioinformatic tools for secondary datamining studies. Biological data will be linked to dosimetry data, as well as data on clinical presentation and outcome. It will provide a coordinated approach to specimens collected to agreed standard operating procedures and quality standards. The project will provide an unequalled resource for research on the health consequences of exposure of a population to radiation from a nuclear accident.

Agency: European Commission | Branch: H2020 | Program: MSCA-RISE | Phase: MSCA-RISE-2016 | Award Amount: 684.00K | Year: 2017

The objective of the project is determination of universal features and specific properties of various systems spontaneously ordering into spatially inhomogeneous structures (mobile ions in solids, ionic liquid mixtures, soft-matter and biological systems), with special focus on effects of confinement. There is striking similarity between properties of the above systems despite different interactions and length scales of inhomogeneities. The fundamental relation between structural inhomogeneities and mechanical and thermodynamic properties is not fully understood because the exchange of knowledge between the solid-state, liquid-matter, soft-matter and biophysical communities is limited. Theoretical and simulation approaches developed by 3 EU MS \ 1 AC \ 2 TC groups are closely connected or complementary. We use mean-field, liquid-matter, DFT, integral equations, field and collective-variables theories, molecular simulation approaches, and experimental methods of electrochemistry. We will share our experience in constructing/modifying, solving and verifying experimentally models for different complex systems. The new results and theoretical approaches will help in future studies of various inhomogeneous systems. The first work package concerns systems spontaneously forming ordered patterns, from thin films on solid surfaces through particles on interfaces to biological membranes and arid ecosystems. The pattern formation can be exploited in innovative technology. In the second work package we will investigate ionic liquids/ionic-liquid mixtures, especially near charged surfaces and in porous media, and mobile ions in intercalation compounds. Mobile ions and ionic liquids in porous electrodes are potentially important in innovative electrochemistry. EU/TC knowledge transfer will be by joint theoretical, simulation and experimental studies. Open workshops will be organized. Long term visits of young researchers and joint supervision of PhD students are planned.

Shkuratov Y.,University of Kharkiv | Shkuratov Y.,Ukrainian Academy of Sciences | Kaydash V.,University of Kharkiv | Videen G.,Space Science Institute
Icarus | Year: 2012

Images acquired by the LRO NAC allow 3D phase-ratio imagery of several areas in the crater Giordano Bruno. This is a new optical, remote-sensing technique that allows a determination of the optical roughness of the lunar surface. Our study confirms complicated impact melt movement on the flanks and the floor of the crater. In many cases, however, flow structures seen on the inner wall can be attributed to regolith/debris taluses rather than impact melt flows. It was found that the whirlpool-like formation seen near the western side of the crater Giordano Bruno has a small central depression that can be interpreted as either a vortex cavity or a feature which resembles such a vortex formed by viscous flows coming from the crater flanks. We discuss several features that confirm the young age of the crater, concluding, however, that it was not formed within human history; its age is, likely, on the order of 1. My. © 2012 Elsevier Inc.

Sprynskyy M.,Nicolaus Copernicus University | Kovalchuk I.,Nicolaus Copernicus University | Kovalchuk I.,Ukrainian Academy of Sciences | Buszewski B.,Nicolaus Copernicus University
Journal of Hazardous Materials | Year: 2010

In this work the natural and the surfactant modified diatomite has been tested for ability to remove uranium ions from aqueous solutions. Such controlling factors of the adsorption process as initial uranium concentration, pH, contact time and ionic strength have been investigated. Effect of ionic strength of solution has been examined using the solutions of NaCl, Na2CO3 and K2SO4. The pseudo-first order and the pseudo-second order models have been used to analyze the adsorption kinetic results, whereas the Langmuir and the Freundlich isotherms have been used to the equilibrium adsorption data. The effects of the adsorbent modification as well as uranium adsorption on the diatomite surface have been studied using X-ray powder diffraction, scanning electron microscopy and FTIR spectroscopy. The maximum adsorption capacities of the natural and the modified diatomite towards uranium were 25.63μmol/g and 667.40μmol/g, respectively. The desorptive solutions of HCl, NaOH, Na2CO3, K2SO4, CaCO3, humic acid, cool and hot water have been tested to recover uranium from the adsorbent. The highest values of uranium desorption (86%) have been reached using 0.1M HCl. © 2010 Elsevier B.V.

Kharchenko V.O.,Ukrainian Academy of Sciences | Kharchenko V.O.,University of Augsburg | Kharchenko D.O.,Ukrainian Academy of Sciences
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2012

We study overdamped stochastic model describing adsorption or desorption processes with nonequilibrium chemical reactions on the surface. It is shown that internal noise satisfying the fluctuation-dissipation relation at small intensities governs transitions between ordered thermodynamical dense and diluted phases. These phase transitions are characterized by an increase of fluctuations of the coverage filed and correlation radius of spatial modulation. At large noise intensity a transition towards disordered phase with chaotic spatial configuration is realized. We have shown that organized stationary patterns are of nanometer range. We define that both period of stationary structures and corresponding correlation radius depend on the noise intensity. © 2012 American Physical Society.

Burylov S.V.,Ukrainian Academy of Sciences | Zakhlevnykh A.N.,Perm State University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2013

We obtain a general expression for the orientational energy of an individual anisometric particle suspended in uniform nematic liquid crystals when the main axis of the particle rotates with respect to the nematic director. We show that there is a qualitative and quantitative analogy between the internal and external problems for cylindrical volumes of nematic liquid crystals, and on this basis we obtain an estimate of the orientational energy of a particle of cylindrical (rodlike, needlelike, or ellipsoidal) shape. For an ensemble of such particles we propose a modified form of their orientational energy in the nematic matrix. This orientational energy has the usual second-order term, and additional fourth-order term in the scalar product of the nematic director and the vector which characterizes an average direction of the main axes of the particles. As an example we obtain the expression for the free energy density of ferronematics, i.e., colloidal suspensions of needlelike magnetic particles in nematic liquid crystals. Unlike previous models, the free energy density includes the proposed modified form of the particle orientational energy, and also a contribution describing the surface saddle-splay deformations of the liquid crystal matrix. © 2013 American Physical Society.

Leitherer C.,US Space Telescope Science Institute | Ekstrom S.,Observatoire de Geneva | Meynet G.,Observatoire de Geneva | Schaerer D.,Observatoire de Geneva | And 2 more authors.
Astrophysical Journal, Supplement Series | Year: 2014

We present a new set of synthesis models for stellar populations obtained with Starburst99 and based on new stellar evolutionary tracks with rotation. We discuss models with zero rotation velocity and with velocities of 40% of the break-up velocity on the zero-age main-sequence. These values are expected to bracket realistic rotation velocity distributions in stellar populations. The new rotating models for massive stars are more luminous and hotter due to a larger convective core and enhanced surface abundances. This results in pronounced changes in the integrated spectral energy distribution of a population containing massive stars. The changes are most significant at the shortest wavelengths where an increase of the ionizing luminosity by up to a factor of five is predicted. We also show that high equivalent widths of recombination lines may not necessarily indicate a very young age but can be achieved at ages as late as 107 yr. Comparison of these two boundary cases (0% and 40% of the break-up velocity) will allow users to evaluate the effects of rotation and provide guidance for calibrating the stellar evolution models. We also introduce a new theoretical ultraviolet spectral library built from the Potsdam Wolf-Rayet atmospheres. Its purpose is to help identify signatures of Wolf-Rayet stars in the ultraviolet whose strength is sensitive to the particulars of the evolution models. The new models are available for solar and one-seventh solar metallicities. A complete suite of models can be generated on the Starburst99 Web site. The updated Starburst99 package can be retrieved from that Web site as well. © 2014. The American Astronomical Society. All rights reserved..

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: AAT.2010.1.1-2.;AAT.2010.4.2-2. | Award Amount: 5.93M | Year: 2010

Even though composite materials are already used in the manufacturing of structural components in aeronautics industry a consequent light-weight design of CFRP primary structures is limited due to a lack of adequate joining technologies. In general, adhesive bonding is the optimum technique for joining CFRP light-weight structures, but difficulties in assessing the bond quality by non-destructive testing (NDT) limit its use for aircraft structural assembly. In consequence certification by the regulation authorities is restrictive. In order to implement robust and reliable quality assurance procedures for adhesive bonding, the main objective of ENCOMB (Extended Non-Destructive Testing for Composite Bonds) is the identification, development and adaptation of methods suitable for the assessment of the adhesive bond quality. Since the performance of adhesive bonds depends on the physico-chemical properties of adherend surfaces and adhesives, testing methods for adhesive and adherend surface characterisation will also be developed. The implementation of reliable adhesive bonding processes by advanced quality assurance will lead to an increased use of light-weight composite materials for highly integrated structures minimising rivet based assembly. The expected weight savings for the fuselage airframe are up to 15 %. These weight savings will have further effects on the size and weight of the engines. From the overall weight savings, significant reductions in fuel consumption (direct costs) and hence CO2 emissions per passenger-kilometre will result. In ENCOMB, a multidisciplinary consortium of 14 partners from top-level European research organisations, universities and industries brings together leading experts from all relevant fields. The participation of three major European aircraft manufacturers as well as one SME ensures the consideration of relevant application scenarios, technological specifications and use of the full exploitation potential of the results.

Kravets V.G.,University of Manchester | Neubeck S.,University of Manchester | Grigorenko A.N.,University of Manchester | Kravets A.F.,Ukrainian Academy of Sciences
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

We have experimentally and theoretically demonstrated strong absorption of visible light in a thin nanostructured layer consisting of silver nanoparticles embedded in a dielectric matrix. Light absorption at the level of above 90% is recorded over a wide optical wavelength range (240-850 nm) and for a broad range of angles of light incidence (0°-70°) in extremely thin films (160 nm). We suggest a generic principle for enhancement of light absorption in thin layers of artificial metamaterials and show that effective refractive indices of our samples measured with the help of ellipsometry can be adequately described by an effective-medium theory. We demonstrate that a substantial fraction of light can be trapped in the nanostructured film due to scattering by noble metal nanoparticles and total internal reflection. © 2010 The American Physical Society.

Prevarskaya N.,French Institute of Health and Medical Research | Prevarskaya N.,Lille University of Science and Technology | Ouadid-Ahidouch H.,Laboratory of Cellular and Molecular Physiology | Skryma R.,French Institute of Health and Medical Research | And 2 more authors.
Philosophical Transactions of the Royal Society B: Biological Sciences | Year: 2014

Cancer involves defects in the mechanisms underlying cell proliferation, death and migration. Calcium ions are central to these phenomena, serving as major signalling agents with spatial localization, magnitude and temporal characteristics of calcium signals ultimately determining cell's fate. Cellular Ca2+ signalling is determined by the concerted action of a molecular Ca2+handling toolkit which includes: active energy-dependent Ca2+ transporters, Ca2+-permeable ion channels, Ca2+-binding and storage proteins, Ca2+dependent effectors. In cancer, because of mutations, aberrant expression, regulation and/or subcellular targeting of Ca2+-handling/transport protein(s) normal relationships among extracellular, cytosolic, endoplasmic reticulum and mitochondrial Ca2+ concentrations or spatio-temporal patterns of Ca2+ signalling become distorted. This causes deregulation of Ca2+dependent effectors that control signalling pathways determining cell's behaviour in a way to promote pathophysiological cancer hallmarks such as enhanced proliferation, survival and invasion. Despite the progress in our understanding of Ca2+ homeostasis remodelling in cancer cells as well as in identification of the key Ca2+-transport molecules promoting certain malignant phenotypes, there is still a lot of work to be done to transform fundamental findings and concepts into new Ca2+ transport-targeting tools for cancer diagnosis and treatment. © 2014 The Author(s) Published by the Royal Society.

Potoyan D.A.,University of Maryland University College | Savelyev A.,Ukrainian Academy of Sciences | Papoian G.A.,University of Maryland University College
Wiley Interdisciplinary Reviews: Computational Molecular Science | Year: 2013

The growing interest in the DNA-based mesoscale systems of biological and nonbiological nature has encouraged the computational molecular science community to develop coarse-grained (CG) representationsof the DNA that will be simple enough to permit exhaustive simulations in a reasonable amount of time, yet complex enough to capture the essential physics at play. In the recent years, there have been some major developments in the DNA coarse-graining area and several fairly sophisticated models are now available that faithfully reproduce key mechanical and chemical properties of the double- and single-stranded DNA. However, there are still many challenges, which limit the applicability of the present models, and much has to be done yet to develop more reliable schemes which would have a predictive power beyond the target domain of the intrinsic parametrization. A development of robust, controllable, and transferrable CG DNA force fields will provide an invaluable tool for gaining physical insights into the molecular nature of complex DNA-based nanoscale entities such as the chromatin, virus capsids, and DNA nanocomposites. In the present contribution, we provide an overview of the recent developments in the DNA coarse-graining field. Our aim is to review the existing CG models of the double-stranded DNA, where a small selection of models, which we believe provide avenues for promising future development, are discussed in some detail. © 2012 John Wiley & Sons, Ltd.

Ihl R.,Maria Hilf Hospital Krefeld | Tribanek M.,Dr. Willmar Schwabe Pharmaceuticals | Bachinskaya N.,Ukrainian Academy of Sciences
Pharmacopsychiatry | Year: 2012

Introduction: A 24-week randomised controlled trial was conducted to assess the efficacy of a 240 mg once-daily preparation of Ginkgo biloba extract EGb 761 ® in 404 outpatients50 years diagnosed with mild to moderate dementia (SKT 9-23), Alzheimer's disease (AD) or vascular dementia (VaD), with neuropsychiatric features (NPI total score5). Methods: Separate analyses were performed for diagnostic subgroups (probable or possible AD; VaD). Results: 333 patients were diagnosed with AD and 71 with VaD. EGb 761 ® treatment was superior to placebo with respect to the SKT total score (drug-placebo differences: 1.7 for AD, p<0.001, and 1.4 for VaD, p<0.05) and the NPI total score (drug-placebo differences: 3.1 for AD, p<0.001 and 3.2 for VaD, p<0.05). Significant drug-placebo differences were found for most secondary outcome variables with no major differences between AD and VaD subgroups. Rates of adverse events in EGb 761 ® and placebo groups were essentially similar. Conclusion: EGb 761 ® improved cognitive functioning, neuropsychiatric symptoms and functional abilities in both types of dementia. © Georg Thieme Verlag KG - Stuttgart - New York.

Miniati F.,ETH Zurich | Elyiv A.,University of Liège | Elyiv A.,Ukrainian Academy of Sciences
Astrophysical Journal | Year: 2013

The stability properties of a low-density ultrarelativistic pair beam produced in the intergalactic medium (IGM) by multi-TeV gamma-ray photons from blazars are analyzed. The problem is relevant for probes of magnetic field in cosmic voids through gamma-ray observations. In addition, dissipation of such beams could considerably affect the thermal history of the IGM and structure formation. We use a Monte Carlo method to quantify the properties of the blazar-induced electromagnetic shower, in particular the bulk Lorentz factor and the angular spread of the pair beam generated by the shower, as a function of distance from the blazar itself. We then use linear and nonlinear kinetic theory to study the stability of the pair beam against the growth of electrostatic plasma waves, employing the Monte Carlo results for our quantitative estimates. We find that the fastest growing mode, like any perturbation mode with even a very modest component perpendicular to the beam direction, cannot be described in the reactive regime. Due to the effect of nonlinear Landau damping, which suppresses the growth of plasma oscillations, the beam relaxation timescale is found to be significantly longer than the inverse Compton loss time. Finally, density inhomogeneities associated with cosmic structure induce loss of resonance between the beam particles and plasma oscillations, strongly inhibiting their growth. We conclude that relativistic pair beams produced by blazars in the IGM are stable on timescales that are long compared with the electromagnetic cascades. There appears to be little or no effect of pair beams on the IGM. © 2013. The American Astronomical Society. All rights reserved.

Savelyev A.,University of North Carolina at Chapel Hill | Savelyev A.,Ukrainian Academy of Sciences | Materese C.K.,University of North Carolina at Chapel Hill | Papoian G.A.,University of North Carolina at Chapel Hill | Papoian G.A.,University of Maryland University College
Journal of the American Chemical Society | Year: 2011

Double-stranded DNA is among the stiffest biopolymers, whose bending propensity crucially influences many vital biological processes. It is not fully understood which among the two most likely forces, electrostatic self-repulsion or the compressive base pair stacking, plays a dominant role in determining the DNA's unique rigidity. Different theoretical and experimental studies led so far to contradictory results on this issue. In this Communication, we address this important question by means of Molecular Dynamics (MD) simulations using both atomistic and coarse-grained force fields. Using two independent sets of calculations, we found that electrostatic and nonelectrostatic effects play a comparable role in maintaining DNA's stiffness. Our findings substantially differ from predictions of existing theories for DNA rigidity and may indicate that a new conceptual understanding needs to be developed. © 2011 American Chemical Society.

Prevarskaya N.,French Institute of Health and Medical Research | Skryma R.,Lille University of Science and Technology | Shuba Y.,Ukrainian Academy of Sciences | Shuba Y.,State Key Laboratory of Molecular and Cellular Biology
Expert Opinion on Therapeutic Targets | Year: 2013

Introduction: Cancer is caused by defects in the mechanisms underlying cell proliferation, death and migration. Calcium ions are central to all of these phenomena, serving as major signalling agents with the spatial localisation, magnitude and temporal characteristics of calcium signals ultimately determining cell's fate. The transformation of a normal cell into a malignant derivative is associated with a major rearrangement of Ca2+ pumps, Na/Ca exchangers and Ca2+ channels, which leads to enhanced proliferation and invasion under compromised/impaired ability to die. Areas covered: This paper examines the changes in Ca2+ signalling and the mechanisms that underlie the passage from normal to pathological cell growth and death control. Understanding these changes and identifying the molecular players involved provide new perspectives for cancer treatment. Expert opinion: Despite compelling evidence that the disruption of Ca2+ homeostasis in cancer cells leads to the promotion of certain malignant phenotypes as well as the identification of key Ca2+-transporting molecules whose altered expression and/or function underlies pathological changes, the therapeutic utilisation of these findings for cancer treatment is still at its infancy. However, the rapid development of the field warrants the development of improved molecular Ca2+ transport-targeting tools for cancer diagnosis and treatment. © 2013 Informa UK, Ltd.

Kachkovskyi G.,University of Regensburg | Kachkovskyi G.,Ukrainian Academy of Sciences | Faderl C.,University of Regensburg | Reiser O.,University of Regensburg
Advanced Synthesis and Catalysis | Year: 2013

Visible light-mediated decarboxylation using N-acyloxyphthalimides as the source for carbon-centered radicals was applied for the synthesis of spirobutenolides. The utility of this approach is demonstrated with the formal synthesis of (S)-(+)-lycoperdic acid. Alternatively, 2,3-anellated furans can be obtained in a one-pot procedure via photocyclization following a regioselective semipinacol rearrangement. © 2013 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim.

Agency: European Commission | Branch: H2020 | Program: MSCA-RISE | Phase: MSCA-RISE-2016 | Award Amount: 1.11M | Year: 2017

The proposal is devoted to a development of smart drug-vector nanostructures (DVNs) based on stimuli-responsive inorganic, hybrid inorgano-organic nanomatrices, and polymer nanocapsules bearing new pharmaceutically active compounds (PhACs) and synthetic derivatives of natural PhACs. The innovative idea is the DVNs can enter target cancer cell or protozoan parasite infected cell through receptor mediated endocytosis and interact with distinct compartments of the cellular secretory pathway. Owing to adaptive drug release in response to variations in pH and redox environment, the parasite growth or cancer cells proliferation will be suppressed. For this purpose, strongly international and interdisciplinary VAHVISTUS consortium is created. Thus, principal objective of the proposal is to strengthen the existing international collaborations between the Consortium Partners and to establish new long-lasting international and inter-sectoral ones, to provide knowledge sharing through exchanges of research and innovation staff, and to create an intercontinental network in the area of smart DVNs for adaptive delivery to target cells. 6 academic organisations and 1 industrial partner of the Consortium from 3 MS/AC and 3 TC will develop intense and continuous knowledge sharing by cross-fertilisation of ideas through international and intersectoral secondments of staff at different carrier stages. The exchanges are well balanced between ER and ESR, men and women. The Proposal implementation is divided into 7 Work packages. A multicultural creative environment within the VAHVISTUS will contribute to make research and innovation an attractive carrier. Communication and dissemination activities as well as exploitation of results will be crucial within the VAHVISTUS. The Project results will enhance the competitiveness of European pharmaceutical industry, health care, and higher education. A Summer school will be organised on Smart Nanocarriers for Adaptive Drug Delivery.

Solovan M.M.,Chernivtsy National University | Brus V.V.,Ukrainian Academy of Sciences | Maryanchuk P.D.,Chernivtsy National University
Semiconductors | Year: 2013

Photosensitive n-TiN/p-Si heterojunctions are fabricated by the reactive magnetron sputtering of a thin titanium-nitride film with n-type conductivity onto polished polycrystalline p-Si wafers. The I-V characteristics of the heterostructures are measured at different temperatures. The temperature dependences of the potential-barrier height and series resistance of the n-TiN/p-Si heterojunction are studied. The dominant mechanisms of current transport through the heterojunction in the cases of forward and reverse bias are established. The heterostructures generate the open-circuit voltage V oc = 0.4 V and the short-circuit current I sc = 1.36 mA/cm2 under illumination with a power density of 80 mW/cm2. © 2013 Pleiades Publishing, Ltd.

Agency: European Commission | Branch: H2020 | Program: CSA | Phase: MG-1.5-2016-2017 | Award Amount: 1.00M | Year: 2016

The overall aim of the AERO-UA project is to stimulate aviation research collaboration between the EU and Ukraine through strategic and targeted support. AERO-UA is focused solely on Ukraine, because the country has a huge aerospace potential but a low level of aviation research collaboration with the EU. Ukraines aerospace sector spans the full spectrum of systems and components development and production with OEMs, Tier 1 and 2 suppliers, aeroengine manufacturers, control systems manufacturers, R&D institutions, aeronautic universities, and SMEs. This is also reflected in the sectors important contributor to the countrys economy (e.g. aircraft production of 1,9 billion in 2011). Ukrainian aerospace organisations possess unique know-how that can help Europe address the challenges identified in the ACARE SRIA / Flightpath 2050 Report. Furthermore, following the signing of the Agreement for the Association of Ukraine to Horizon 2020 in March 2015, Ukrainian organisations are eligible to participate in Clean Sky 2 and H2020 Transport on the same funding terms as those from EU member states. Equally, genuine commercial opportunities exist for European aviation organisations to help modernise Ukraines aerospace sector. The AERO-UA project will achieve its overall aim via four high-level objectives: 1. Identifying the barriers to increased EU-UA aviation research collaboration; 2. Providing strategic support to EU-UA aviation research collaboration; 3. Supporting EU-UA aviation research knowledge transfer pilot projects; and 4. Organising awareness-raising and networking between EU-UA stakeholders. The AERO-UA consortium is comprised of key EU and UA aviation organisations that will implement WPs closely mapped to the high-level objectives. The consortium will be supported by an Advisory Board involving Airbus, DLR, Min. Education and Science of Ukraine, Ukrainian State Air Traffic Services Enterprise and retired Director of EADS Jean-Pierre Barthlemy.

Mishchenko M.I.,NASA | Dlugach Z.M.,Ukrainian Academy of Sciences | Zakharova N.T.,Trinnovim LLC
Optics Letters | Year: 2014

The modified unrestricted effective-medium refractive index is defined as one that yields accurate values of a representative set of far-field scattering characteristics (including the scattering matrix) for an object made of randomly heterogeneous materials. We validate the concept of the modified unrestricted effective-medium refractive index by comparing numerically exact superposition T-matrix results for a spherical host randomly filled with a large number of identical small inclusions and Lorenz-Mie results for a homogeneous spherical counterpart. A remarkable quantitative agreement between the superposition T-matrix and Lorenz-Mie scattering matrices over the entire range of scattering angles demonstrates unequivocally that the modified unrestricted effective-medium refractive index is a sound (albeit still phenomenological) concept provided that the size parameter of the inclusions is sufficiently small and their number is sufficiently large. Furthermore, it appears that in cases when the concept of the modified unrestricted effective-medium refractive index works, its actual value is close to that predicted by the Maxwell-Garnett mixing rule. © 2014 Optical Society of America.

Bliokh K.Y.,RIKEN | Bliokh K.Y.,Ukrainian Academy of Sciences | Schattschneider P.,Vienna University of Technology | Verbeeck J.,University of Antwerp | And 2 more authors.
Physical Review X | Year: 2012

We examine the propagation of the recently discovered electron vortex beams in a longitudinal magnetic field. We consider both the Aharonov-Bohm configuration with a single flux line and the Landau case of a uniform magnetic field. While stationary Aharonov-Bohm modes represent Bessel beams with flux- and vortex-dependent probability distributions, stationary Landau states manifest themselves as nondiffracting Laguerre-Gaussian beams. Furthermore, the Landau-state beams possess field- and vortex-dependent phases: (i) the Zeeman phase from coupling the quantized angular momentum to the magnetic field and (ii) the Gouy phase, known from optical Laguerre-Gaussian beams. Remarkably, together these phases determine the structure of Landau energy levels. This unified Zeeman-Landau-Gouy phase manifests itself in a nontrivial evolution of images formed by various superpositions of modes. We demonstrate that, depending on the chosen superposition, the image can rotate in a magnetic field with either (i) Larmor, (ii) cyclotron (double-Larmor), or (iii) zero frequency. At the same time, its centroid always follows the classical cyclotron trajectory, in agreement with the Ehrenfest theorem. Interestingly, the nonrotating superpositions reproduce stable multivortex configurations that appear in rotating superfluids. Our results open an avenue for the direct electron-microscopy observation of fundamental properties of free quantum-electron states in magnetic fields.

Guzzinati G.,University of Antwerp | Schattschneider P.,Vienna University of Technology | Bliokh K.Y.,RIKEN | Bliokh K.Y.,Ukrainian Academy of Sciences | And 3 more authors.
Physical Review Letters | Year: 2013

Electron vortex beams carrying intrinsic orbital angular momentum (OAM) are produced in electron microscopes where they are controlled and focused by using magnetic lenses. We observe various rotational phenomena arising from the interaction between the OAM and magnetic lenses. First, the Zeeman coupling, proportional to the OAM and magnetic field strength, produces an OAM-independent Larmor rotation of a mode superposition inside the lens. Second, when passing through the focal plane, the electron beam acquires an additional Gouy phase dependent on the absolute value of the OAM. This brings about the Gouy rotation of the superposition image proportional to the sign of the OAM. A combination of the Larmor and Gouy effects can result in the addition (or subtraction) of rotations, depending on the OAM sign. This behavior is unique to electron vortex beams and has no optical counterpart, as Larmor rotation occurs only for charged particles. Our experimental results are in agreement with recent theoretical predictions. © 2013 American Physical Society.

Kushch V.I.,Ukrainian Academy of Sciences | Mogilevskaya S.G.,University of Minnesota | Stolarski H.K.,University of Minnesota | Crouch S.L.,University of Minnesota
Journal of the Mechanics and Physics of Solids | Year: 2011

A complete solution has been obtained for the problem of multiple interacting spherical inhomogeneities with a GurtinMurdoch interface model that includes both surface tension and surface stiffness effects. For this purpose, a vectorial spherical harmonics-based analytical technique is developed. This technique enables solution of a wide class of elasticity problems in domains with spherical boundaries/interfaces and makes fulfilling the vectorial boundary or interface conditions a routine procedure. A general displacement solution of the single-inhomogeneity problem is sought in a form of a series of the vectorial solutions of the Lame equation. This solution is valid for any non-uniform far-field load and it has a closed form for polynomial loads. The superposition principle and re-expansion formulas for the vectorial solutions of the Lame equation extend this theory to problems involving multiple inhomogeneities. The developed semi-analytical technique precisely accounts for the interactions between the nanoinhomogeneities and constitutes an efficient computational tool for modeling nanocomposites. Numerical results demonstrate the accuracy and numerical efficiency of the approach and show the nature and extent to which the elastic interactions between the nanoinhomogeneities with interface stress affect the elastic fields around them. © 2011 Elsevier Ltd.

Bazaliy Y.B.,University of South Carolina | Bazaliy Y.B.,Ukrainian Academy of Sciences
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

Planar spin transfer devices with dominating easy-plane anisotropy can be described by an effective one-dimensional equation for the in-plane angle. Such a description provides an intuitive qualitative understanding of the magnetic dynamics. We give a detailed derivation of the effective planar equation and use it to describe magnetic switching in devices with tilted polarizer. © 2012 American Physical Society.

Chang S.T.,Mushroom | Chang S.T.,Ukrainian Academy of Sciences | Wasser S.P.,Haifa University | Wasser S.P.,Ukrainian Academy of Sciences
International Journal of Medicinal Mushrooms | Year: 2012

Mushrooms are part of fungal biota characterized by wonder. They rise up from lignocellulosic wastes: yet they become so bountiful and nourishing. Mushrooms are environmentally friendly. They biosynthesize their own food from agricultural crop residues, which would otherwise cause health hazards. The extant records show the continued use of some mushrooms, e.g., Lentinus edodes, Ganoderma lucidum, and Cordyceps sinensis are now centuries old. This review presents a pyramid model for mushroom uses (industries), as food, dietary supplements (tonic), and medicine. A regular intake of mushrooms can make us healthier, fitter, and happier, and help us live longer. The sense of purpose and vision for the mushroom industries is also briefly discussed. A variety of mushrooms have been used traditionally in many different cultures for the maintenance of health and in the prevention and treatment of various diseases. A total of 126 medicinal functions are thought to be produced by medicinal mushrooms (MM) and fungi, including antitumor, immunomodulating, antioxidant, radical scavenging, cardiovascular, anti-hypercholesterolemia, antiviral, antibacterial, anti-parasitic, antifungal, detoxification, hepatoprotective, and anti-diabetic effects. Special attention is paid to mushroom polysaccharides. Many, if not all, higher Basidiomycetes mushrooms contain biologically active polysaccharides in fruit bodies, cultured mycelium, and cultured broth. The data on mushroom polysaccharides are summarized for approximately 700 species of higher Hetero- and Homobasidiomycetes. In particular, the most important for modern medicine are polysaccharides with antitumor and immunostimulating properties. Several of the mushroom polysaccharide compounds have proceeded through phase I, II, and III clinical trials and are used extensively and successfully as drugs in Asia to treat various cancers and other diseases. Mushrooms are superior sources of different types of dietary supplements (DSs) (tonics). The advantages of using mushroom-based DSs as a matter of safety (as opposed to herbal preparations) are: (1) The overwhelming majority of mushrooms used for production of DSs are cultivated commercially (and not gathered in the wild). (2) Mushrooms are easily propagated vegetatively and thus keep to one clone. The mycelium can be stored for a long time, and the genetic and biochemical consistency can be checked after a considerable time. (3) The main advantage, in our opinion, is that many mushrooms are capable of growing in the form of mycelial biomass in submerged cultures. In this review, we discuss legal and regulatory issues introducing and controlling DSs from MMs in different countries, including the United States, the European Community, Australia, New Zealand, Japan, and P.R. China, and guidelines of the World Health Organization. One of the targets of the present review is also to draw attention to many critically important unsolved problems in the future development of medicinal mushroom science in the 21st century. © 2012 Begell House, Inc.

Kalinin S.V.,Oak Ridge National Laboratory | Morozovska A.N.,Ukrainian Academy of Sciences | Chen L.Q.,Pennsylvania State University | Rodriguez B.J.,University College Dublin
Reports on Progress in Physics | Year: 2010

Ferroelectrics and multiferroics have recently emerged as perspective materials for information technology and data storage applications. The combination of extremely narrow domain wall width and the capability to manipulate polarization by electric field opens the pathway toward ultrahigh (>10 TBit inch-2) storage densities and small (sub-10 nm) feature sizes. The coupling between polarization and chemical and transport properties enables applications in ferroelectric lithography and electroresistive devices. The progress in these applications, as well as fundamental studies of polarization dynamics and the role of defects and disorder on domain nucleation and wall motion, requires the capability to probe these effects on the nanometer scale. In this review, we summarize the recent progress in applications of piezoresponse force microscopy (PFM) for imaging, manipulation and spectroscopy of ferroelectric switching processes. We briefly introduce the principles and relevant instrumental aspects of PFM, with special emphasis on resolution and information limits. The local imaging studies of domain dynamics, including local switching and relaxation accessed through imaging experiments and spectroscopic studies of polarization switching, are discussed in detail. Finally, we review the recent progress on understanding and exploiting photochemical processes on ferroelectric surfaces, the role of surface adsorbates, and imaging and switching in liquids. Beyond classical applications, probing local bias-induced transition dynamics by PFM opens the pathway to studies of the influence of a single defect on electrochemical and solid state processes, thus providing model systems for batteries, fuel cells and supercapacitor applications. © 2010 IOP Publishing Ltd.

Ievlev A.V.,Oak Ridge National Laboratory | Jesse S.,Oak Ridge National Laboratory | Morozovska A.N.,Ukrainian Academy of Sciences | Strelcov E.,Oak Ridge National Laboratory | And 6 more authors.
Nature Physics | Year: 2013

Memristive materials and devices, which enable information storage and processing on one and the same physical platform, offer an alternative to conventional von Neumann computation architectures. Their continuous spectra of states with intricate field-history dependence give rise to complex dynamics, the spatial aspect of which has not been studied in detail yet. Here, we demonstrate that ferroelectric domain switching induced by a scanning probe microscopy tip exhibits rich pattern dynamics, including intermittency, quasiperiodicity and chaos. These effects are due to the interplay between tip-induced polarization switching and screening charge dynamics, and can be mapped onto the logistic map. Our findings may have implications for ferroelectric storage, nanostructure fabrication and transistor-less logic. © 2014 Macmillan Publishers Limited. All rights reserved.

Ventskovska O.,University of Helsinki | Ventskovska O.,Ukrainian Academy of Sciences | Porkka-Heiskanen T.,University of Helsinki | Karpova N.N.,University of Helsinki
Journal of Sleep Research | Year: 2015

Brain-derived neurotrophic factor (Bdnf) regulates neuronal plasticity, slow wave activity and sleep homeostasis. Environmental stimuli control Bdnf expression through epigenetic mechanisms, but there are no data on epigenetic regulation of Bdnf by sleep or sleep deprivation. Here we investigated whether 5-methylcytosine (5mC) DNA modification at Bdnf promoters p1, p4 and p9 influences Bdnf1, Bdnf4 and Bdnf9a expression during the normal inactive phase or after sleep deprivation (SD) (3, 6 and 12 h, end-times being ZT3, ZT6 and ZT12) in rats in two brain areas involved in sleep regulation, the basal forebrain and cortex. We found a daytime variation in cortical Bdnf expression: Bdnf1 expression was highest at ZT6 and Bdnf4 lowest at ZT12. Such variation was not observed in the basal forebrain. Also Bdnf p1 and p9 methylation levels differed only in the cortex, while Bdnf p4 methylation did not vary in either area. Factorial analysis revealed that sleep deprivation significantly induced Bdnf1 and Bdnf4 with the similar pattern for Bdnf9a in both basal forebrain and cortex; 12 h of sleep deprivation decreased 5mC levels at the cortical Bdnf p4 and p9. Regression analysis between the 5mC promoter levels and the corresponding Bdnf transcript expression revealed significant negative correlations for the basal forebrain Bdnf1 and cortical Bdnf9a transcripts in only non-deprived rats, while these correlations were lost after sleep deprivation. Our results suggest that Bdnf transcription during the light phase of undisturbed sleep-wake cycle but not after SD is regulated at least partially by brain site-specific DNA methylation. © 2014 European Sleep Research Society.

Agency: European Commission | Branch: H2020 | Program: MSCA-RISE | Phase: MSCA-RISE-2015 | Award Amount: 202.50K | Year: 2016

Real cell membranes are essentially asymmetric and non-planar. Outer leaflets of the plasma membranes contain neutral lipids and glycolipids, while the inner leaflets host practically all anionic lipids and phosphoinositides. In addition to asymmetric composition the membranes are usually curved due to spontaneous curvature of the membrane lipids and an influence of membrane proteins and cytoskeleton. There are many cellular phenomena, which are influenced by the asymmetry and the membrane curvature such as formation of synaptic vesicles, blebs and apoptotic bodies, membrane fusion and splitting, budding of enveloped viruses, endo and exocytosis, etc. In this work we propose comprehensive interdisciplinary study of the influence of membrane asymmetry and curvature on the functioning of integral membrane proteins and the transmembrane transport of therapeutic compounds (such as cisplatin and its derivatives). The goal is to reveal major physical factors, which distinguish asymmetric and curved membrane environment and govern interactions, orientation and diffusion of the small molecules (drugs) and large integral proteins. The combination of experimental methods (wet biochemistry and molecular biology, enhanced infrared and Raman spectroscopy) and computer simulations (coarse-grained and atomistic molecular dynamics, quantum chemistry) would be used in the project in complimentary manner.

Zevin A.A.,Ukrainian Academy of Sciences | Pinsky M.A.,University of Nevada, Reno
Automatica | Year: 2011

This paper solves the problem of finding an optimal feedback control ensuring the maximal rate of convergence of system solutions to the origin for a general class of planar control systems including switched, bilinear systems and ones described by differential inclusions, etc. The prescribed control set is assumed to be compact but not necessarily convex. The developed approach is based on finding the minimal Lyapunov exponent of the system with an open loop control which provides an upper bound for the optimal convergence rate of the closed loop system. Then an optimal feedback controller is constructed for which the obtained bound is attained. © 2011 Elsevier Ltd. All rights reserved.

Rozenbaum V.M.,Ukrainian Academy of Sciences | Shapochkina I.V.,Belarusian State University
JETP Letters | Year: 2015

A generalized approach has been proposed to describe the diffusive transport of inertial particles at which the known inertialess relations (in particular, between the concentration of particles and the corresponding flux) are supplemented by a factor allowing the calculation of inertial effects in terms of the matrix continued fraction method. The advantage of this approach, which is in the analytical representation of the results, is illustrated by solving the problem of the determination of the effective diffusion coefficient of an inertial particle in a sawtooth potential and the average velocity of the adiabatic inertial ratchet. The character of the nonanalytic behavior of these quantities in the presence of large gradients of the potential has been established. © 2015, Pleiades Publishing, Inc.

Abbas C.A.,Archer Daniels Midland Company | Sibirny A.A.,Ukrainian Academy of Sciences | Sibirny A.A.,University of Rzeszow
Microbiology and Molecular Biology Reviews | Year: 2011

Riboflavin [7,8-dimethyl-10-(1′-D-ribityl)isoalloxazine, vitamin B2] is an obligatory component of human and animal diets, as it serves as the precursor of flavin coenzymes, flavin mononucleotide, and flavin adenine dinucleotide, which are involved in oxidative metabolism and other processes. Commercially produced riboflavin is used in agriculture, medicine, and the food industry. Riboflavin synthesis starts from GTP and ribulose-5-phosphate and proceeds through pyrimidine and pteridine intermediates. Flavin nucleotides are synthesized in two consecutive reactions from riboflavin. Some microorganisms and all animal cells are capable of riboflavin uptake, whereas many microorganisms have distinct systems for riboflavin excretion to the medium. Regulation of riboflavin synthesis in bacteria occurs by repression at the transcriptional level by flavin mononucleotide, which binds to nascent noncoding mRNA and blocks further transcription (named the riboswitch). In flavinogenic molds, riboflavin overproduction starts at the stationary phase and is accompanied by derepression of enzymes involved in riboflavin synthesis, sporulation, and mycelial lysis. In flavinogenic yeasts, transcriptional repression of riboflavin synthesis is exerted by iron ions and not by flavins. The putative transcription factor encoded by SEF1 is somehow involved in this regulation. Most commercial riboflavin is currently produced or was produced earlier by microbial synthesis using special selected strains of Bacillus subtilis, Ashbya gossypii, and Candida famata. Whereas earlier RF overproducers were isolated by classical selection, current producers of riboflavin and flavin nucleotides have been developed using modern approaches of metabolic engineering that involve overexpression of structural and regulatory genes of the RF biosynthetic pathway as well as genes involved in the overproduction of the purine precursor of riboflavin, GTP. Copyright © 2011, American Society for Microbiology. All Rights Reserved.

Vorobyov E.I.,University of Vienna | Vorobyov E.I.,Southern Federal University | Zakhozhay O.V.,Ukrainian Academy of Sciences | Dunham M.M.,Yale University
Monthly Notices of the Royal Astronomical Society | Year: 2013

Using numerical hydrodynamic simulations, we study the gravitational fragmentation of an unstable protostellar disc formed during the collapse of a pre-stellar core with a mass of 1.2M⊙. The forming fragments span a mass range from about a Jupiter mass to very low mass protostars and are located at distances from a few tens to a thousand au, with a dearth of objects at ≲100 au. We explore the possibility of observational detection of the fragments in discs viewed through the outflow cavity at a distance of 250 pc. We demonstrate that one hour of integration time with the Atacama Large Millimeter/sub-millimeter Array (ALMA) is sufficient to detect the fragments with masses as low as 1.5MJup at orbital distances up to 800 au from the protostar. The ALMA resolution sets the limit on the minimum orbital distance of detectable fragments. For the adopted resolution of our simulated ALMA images of 0.1 arcsec, the fragments can be detected at distances down to 50 au. At smaller distances, the fragments usually merge with the central density peak. The likelihood for detecting the fragments reduces significantly for a lower resolution of 0.5 arcsec. Some of the most massive fragments, regardless of their orbital distance, can produce characteristic peaks at ̃5 μm and hence their presence can be indirectly inferred from the observed spectral energy distributions of protostars. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

Kostenko A.,University of Vienna | Malamud M.,Ukrainian Academy of Sciences
Annales Henri Poincare | Year: 2014

We study spectral properties of Hamiltonians HX,β,q with δ′-point interactions on a discrete set X = {xk}k=1 ∞ ⊂ (0, +∞). Using the form approach, we establish analogs of some classical results on operators Hq = -d2/dx 2 + q with locally integrable potentials q ∈ L1 loc[0, +∞). In particular, we establish the analogues of the Glazman-Povzner-Wienholtz theorem, the Molchanov discreteness criterion, and the Birman theorem on stability of an essential spectrum. It turns out that in contrast to the case of Hamiltonians with δ-interactions, spectral properties of operators HX,β,q are closely connected with those of HX,q N = ⊕kHq,k N, where Hq,k N is the Neumann realization of -d2/dx 2 + q in L 2(x k-1,x k). © 2013 Springer Basel.

Metlov L.S.,Ukrainian Academy of Sciences | Metlov L.S.,Donetsk National University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

In the framework of a two-defect model, based on a variation of the Landau technique, the kinetics of structural defect generation in solids under severe external load is investigated. The approach is based on a special form of kinetic equation in terms of internal energy, which is applied here to the description of an important practical problem of fine-grained structure formation in metals under severe plastic deformation. It unifies strengthening curves over the entire range of deformation, including the Hall-Petch and linear strengthening sections. © 2014 American Physical Society.

Rozenbaum V.M.,Ukrainian Academy of Sciences | Shapochkina I.V.,Belarusian State University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2011

We consider the directed motion of a Brownian particle in a two-well periodic potential with time-varying barriers and wells described by arbitrary periodic functions of time, v(t) and u(t), alternating with the period τ. In the framework of the low-temperature kinetic approach, we obtain explicit formulas for the probabilities of finding the particle in potential wells, average velocity of directed motion, input energy Pin and useful work Pout against additionally introduced stationary load force f. These formulas are considerably simplified by the assumption of the quasiequilibrium regime of motion corresponding to small values of u(t) and f. It is shown that depending on the same or opposite parity of the functions v(t) and u(t) with respect to time reversal, the motion direction of a Brownian particle is retained or reversed under the reversal of the direction of movement along the (v-u) loop in the phase space of the functions v(t) and u(t), and the nondiagonal kinetic coefficients are mutually symmetric or antisymmetric. In the adiabatic limit τ→, the average velocity is proportional to τ-1 in two cases: (i) the above loop has a nonzero area, (ii) the functions v(t) and u(t) are proportional to each other (zero loop area) and include intervals of fast changes with small durations τ0 on the period τ of their variations. In both of these cases, the efficiency of energy conversion, η=Pout/Pin, tends to unity at large variations of the barriers v(t). In the second case, the deviation of η from unity can be split into two contributions: The former decreases exponentially with increasing amplitude v0 of v(t), while the latter is a small nonadiabatic correction proportional to v0-3/2. It is the nonadiabatic correction that limits high efficiencies at large variations of barriers. © 2011 American Physical Society.

Zevin A.A.,Ukrainian Academy of Sciences | Pinsky M.A.,University of Nevada, Reno
IEEE Transactions on Automatic Control | Year: 2010

Stability of a set of systems with norm bounded nonlinear terms and arbitrary time-varying as well as distributed delays is studied. A novel approach to this problem, based on deriving bounds for the norms of system solutions, is developed. A sharp estimate for the maximal Lyapunov exponent of the solutions, expressed in the bounds for the uncertain parameters, is found. The subsystems, for which the obtained estimate is attained, are indicated. Using these results, a delay-independent necessary and sufficient stability condition for the considered set of systems is derived. For a system with prescribed parameters, sufficient conditions for exponential stability and upper bound for the maximal Lyapunov exponent are obtained. The proposed approach is applied to illustrative examples which contrast its efficiency. © 2010 IEEE.

Krivoruchko V.N.,Ukrainian Academy of Sciences | Marchenko M.A.,Ukrainian Academy of Sciences | Melikhov Y.,University of Cardiff
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

A phenomenological model is developed for systematic study of the universal features in metal-insulator transition and magnetoresistivity of mixed-phase manganites. The approach is based on utilization of some hypothesis appropriate to the Preisach picture of the magnetization process for half-metallic ferromagnets and an assumption that in doped manganites a Griffiths-type phase exists just above the magnetic-ordering temperature. Within the model, the system is considered as a random three-dimensional resistor network where a self-consistent formation of paths with metal and polaron types of conductivity is not only due to magnetic field variation but also due to temperature changes, as well. Both mechanisms of intrinsic percolation transition are considered on one basis. The theory is able to replicate the basic regularities found experimentally for doped manganites resistivity dependence on temperature and magnetic field without the need for empirical input from the magnetoresistive data. Within the approach a natural basis has arisen for a qualitative classification of magnetoresistive materials into those, such as La 0.7 Sr0.3 MnO3, showing modest magnetoresistivity, and those, such as La0.7 Ca0.3 MnO3, showing large magnetoresistivity. © 2010 The American Physical Society.

Opanasenko M.,J. Heyrovsky Institute of Physical Chemistry | Opanasenko M.,Ukrainian Academy of Sciences
Catalysis Today | Year: 2015

The catalytic performance of selected MOFs (Cu3(BTC)2 and MIL-100(Fe)) and zeolites (BEA and USY) have been investigated in a set of acid-catalyzed reactions (Pechmann and Knoevenagel condensations, Friedel-Crafts acylation, Beckmann rearrangement, and Prins and annulation reactions). Characteristics determining the activity and selectivity of the catalysts (particularly their relation to the type and concentration of acid sites, the size of the channels, and structure of the active centers) were discussed in detail. The regular arrangement of active sites in MOFs was shown to provide their superior behavior in Pechmann and Knoevenagel condensation reaction, while higher porosity and concentration of mild Lewis acid centers allows the conversion of bulky substrates to desired products over MOFs in Beckmann rearrangement, Friedel-Crafts acylation, and annulation reactions. Advantages and drawbacks of MOFs as catalysts were fairly compared with zeolites based on results obtained under the same reaction conditions for all investigated materials. © 2015 Elsevier B.V. All rights reserved.

Rodriguez K.,Leibniz University of Hanover | Arguelles A.,Leibniz University of Hanover | Kolezhuk A.K.,Ukrainian Academy of Sciences | Kolezhuk A.K.,Taras Shevchenko National University | And 2 more authors.
Physical Review Letters | Year: 2011

We study the phase diagram of repulsively interacting spin-1 bosons in optical lattices at unit filling, showing that an externally induced quadratic Zeeman effect may lead to a rich physics characterized by various phases and phase transitions. We find that the main properties of the system may be described by an effective field model, which provides the precise location of the phase boundaries for any dimension, in excellent agreement with our numerical calculations for one-dimensional (1D) systems. Thus, our work provides a quantitative guide for the experimental analysis of various types of field-induced quantum phase transitions in spin-1 lattice bosons. These transitions, which are precluded in spin-12 systems, may be realized by using an externally modified quadratic Zeeman coupling, similar to recent experiments with spinor condensates in the continuum. © 2011 American Physical Society.

Bochkov G.N.,Novgorod State University | Kuzovlev Yu.E.,Ukrainian Academy of Sciences
Physics-Uspekhi | Year: 2013

We discuss the 'generalized fluctuation-dissipation relations (theorems)' introduced for the first time in our work of 1977-1984 as statistical- thermodynamic consequences of time symmetry (reversibility) of microscopic dynamics. We show, in particular, that various similar relations, including 'fluctuation theorems' that have appeared since the 1990s, are, in essence, alternative formulations or special cases of our old results. © 2013 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.

Opanasenko M.,J. Heyrovsky Institute of Physical Chemistry | Opanasenko M.,Ukrainian Academy of Sciences | Shamzhy M.,J. Heyrovsky Institute of Physical Chemistry | Shamzhy M.,Ukrainian Academy of Sciences | Cejka J.,J. Heyrovsky Institute of Physical Chemistry
ChemCatChem | Year: 2013

The catalytic behavior of metal-organic frameworks Cu-benzene-1,3,5-tricarboxylate (CuBTC) and Fe-benzene-1,3,5-tricarboxylate (FeBTC) was investigated in the Pechmann condensation of different phenols (resorcinol, pyrogallol, and naphthol) with ethyl acetoacetate and compared with large-pore zeolites beta (BEA) and ultrastableY (USY). Zeolites BEA and USY exhibited high activity in transformations of the most active substrates (resorcinol and pyrogallol) but a low conversion of naphthol was observed. Almost total transformation of naphthol (94-98% conversion) to the target product was achieved within 24h of the reaction time over CuBTC and FeBTC. We assume that the regularity in the arrangement of active sites within the framework of CuBTC, which results in the existence of 2 active centers in close proximity, is of critical importance to the transformation of naphthol in the Pechmann reaction that leads to coumarin. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Demchenko A.P.,Ukrainian Academy of Sciences | Demchenko A.P.,Palladin Institute of Biochemistry
Journal of Fluorescence | Year: 2010

Very limited number of parameters is available for fluorescence sensing and imaging. The changes of intensity are of low analytical value due to the absence of internal reference. Anisotropy and lifetime sensing have their own limitations. In this respect the λ-ratiometric (based on intensity ratios at two or more wavelengths) recording of spectral changes becomes more popular. Because the spectral changes are connected directly with the variations of interaction energies this approach is seen as the most universal method to study intermolecular interactions. It is applicable for different sensor formats and for obtaining analytical information from cell images. Here we critically analyze different approaches in λratiometric sensing that use single and double fluorescence emitters and are based on different mechanisms producing spectroscopic change. Very promising is the exploration of mechanisms that allow obtaining ratiometric response from a single dye. © Springer Science+Business Media, LLC 2010.

Zinenko T.L.,Ukrainian Academy of Sciences | Marciniak M.,National Institute of Telecommunications | Marciniak M.,Kielce University of Technology | Nosich A.I.,Ukrainian Academy of Sciences
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2013

We study the plane wave scattering and absorption by a flat grating of thin silver nanostrips located in free space, in the visible-light range. The formulation involves generalized boundary conditions imposed on the strip median lines. We use an accurate numerical solution to this problem based on the dual-series equations and the method of analytical regularization. This guarantees fast convergence and controlled accuracy of computations. Reflectance, transmittance, and absorbance as a function of the wavelength and the grating parameters are analyzed. In addition to well-known surface-plasmon resonances, sharp resonances are revealed in the H-polarized scattering near but not equal to the Rayleigh wavelengths of nonzero diffraction orders; in the E-polarized scattering these resonances are not visible. Asymptotic formulas for the frequencies and natural fields of the grating resonances are presented. © 1995-2012 IEEE.

Yatsenko L.P.,Ukrainian Academy of Sciences | Shore B.W.,618 Escondido Circle | Bergmann K.,University of Kaiserslautern
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2014

We discuss the detrimental effect of small rapid random fluctuations of laser-field amplitude and phase upon the efficiency of stimulated Raman adiabatic passage (STIRAP). Such fluctuations typically accompany the laser stabilization procedures that produce nearly monochromatic light on top of a much broader bandwidth Lorentz-profile pedestal which may carry only a few percent or less of the total power. As we will show, their effects differ qualitatively from the fluctuations that have hitherto been considered (for example, phase diffusion). We present analytic expressions for the population transfer efficiency of STIRAP when limited by stochastic fluctuations of this type. These expressions show, in contrast to situations discussed in the past in which population transfer improves with increasing peak Rabi frequencies, that for the weak broadband noise that accompanies a strong narrow-spectral component, there is an optimum value for the peak Rabi frequency and that the effect of fluctuations, although small, cannot be entirely eliminated in practice. The mission of the current work is to point out that, under the given circumstances, efforts in experiments trying to overcome the detrimental consequences of fluctuations by increasing the intensity, which is the intuitively proper approach, will not be successful. © 2014 American Physical Society.

Borodich F.M.,University of Cardiff | Galanov B.A.,Ukrainian Academy of Sciences | Suarez-Alvarez M.M.,University of Cardiff
Journal of the Mechanics and Physics of Solids | Year: 2014

The JKR (Johnson, Kendall, and Roberts) and Boussinesq-Kendall models describe adhesive frictionless contact between two isotropic elastic spheres, and between a flat-ended axisymmetric punch and an elastic half-space respectively. However, the shapes of contacting solids may be more general than spherical or flat ones. In addition, the derivation of the main formulae of these models is based on the assumption that the material points within the contact region can move along the punch surface without any friction. However, it is more natural to assume that a material point that came to contact with the punch sticks to its surface, i.e. to assume that the non-slipping boundary conditions are valid. It is shown that the frictionless JKR model may be generalized to arbitrary convex, blunt axisymmetric body, in particular to the case of the punch shape being described by monomial (power-law) punches of an arbitrary degree d≥1. The JKR and Boussinesq-Kendall models are particular cases of the problems for monomial punches, when the degree of the punch d is equal to two or it goes to infinity respectively. The generalized problems for monomial punches are studied under both frictionless and non-slipping (or no-slip) boundary conditions. It is shown that regardless of the boundary conditions, the solution to the problems is reduced to the same dimensionless relations among the actual force, displacements and contact radius. The explicit expressions are derived for the values of the pull-off force and for the corresponding critical contact radius. Connections of the results obtained for problems of nanoindentation in the case of the indenter shape near the tip has some deviation from its nominal shape and the shape function can be approximated by a monomial function of radius, are discussed. © 2014 Elsevier Ltd.

Ivashchenko V.I.,Ukrainian Academy of Sciences | Veprek S.,TU Munich | Turchi P.E.A.,Lawrence Livermore National Laboratory | Shevchenko V.I.,Ukrainian Academy of Sciences
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

Using first-principles quantum molecular dynamics (QMD) calculations, heterostructures consisting of one monolayer of interfacial Si xN y inserted between several monolayers of thick slabs of B1(NaCl)-TiN (001) and (111) were investigated in the temperature range of 0 to 1400 K. For the interpretation of the interfacial structures, samples of amorphous SiN and Si 3N 4 were also generated. The temperature-dependent QMD calculations in combination with subsequent variable-cell structural relaxation revealed that the TiN(001)/B1-SiN/TiN(001) interface exists as a pseudomorphic B1-SiN layer only at 0 K. At finite temperature, this heterostructure transforms into distorted octahedral SiN 6 and tetrahedral SiN 4 units aligned along the {110} directions. At 300 K, the aggregates of the SiN x units are close to a disordered, essentially amorphous SiN. After heating to 1400 K and subsequent relaxation at 300 K, the interfacial layer corresponds to a strongly distorted Si 3N 4-like structure. The B1-SiN, Si 3N 4-like SiN, and Si 3N 4-like Si 2N 3 interfaces between the TiN(111) slabs are stable in the whole temperature range considered here. The B1-SiN interfaces are unstable with respect to a formation of Si-vacancies at finite temperatures. An estimate of interfacial formation energies showed that the most favorable configurations of the (111) interfaces are silicon atoms tetrahedrally coordinated to nitrogen. The most stable (001) B1-derived heterostructure with Si 0.75N interface consists of both tetrahedrally and octahedrally coordinated silicon atoms. A comparison with the results obtained by earlier "static" ab initio calculations at 0 K shows the great advantage of the QMD calculations, which accounts for the effects of thermal activation of structural reconstructions. © 2012 American Physical Society.

Konstantinov D.,Okinawa Institute of Science and Technology | Monarkha Y.,Ukrainian Academy of Sciences | Kono K.,RIKEN
Physical Review Letters | Year: 2013

The experimental observation of the strong Coulombic effect on magneto-oscillations of the photoconductivity of surface electrons in liquid helium is reported. The observed broadening of the oscillations and shifts in positions of conductivity extrema with increasing electron density are in good agreement with the linear transport theory, which takes into account an internal electric field of fluctuational origin. These results provide important evidence for identification of the mechanism of the oscillations and zero-resistance states developed in their minima. © 2013 American Physical Society.

Ivashchenko V.I.,Ukrainian Academy of Sciences | Veprek S.,TU Munich | Turchi P.E.A.,Lawrence Livermore National Laboratory | Shevchenko V.I.,Ukrainian Academy of Sciences
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

Heterostructures with one monolayer of interfacial SiC inserted between several B1(NaCl)-TiN (001) and (111) slabs are investigated in the temperature range of 0-1400 K using first-principles quantum molecular dynamics (QMD) calculations. The temperature-dependent QMD calculations in combination with subsequent variable-cell structural relaxation reveal that the TiN(001)/B1-SiC/TiN(001) interface exists as a pseudomorphic B1-SiC layer at temperatures between 0 and 600 K. After heating to 900-1400 K and subsequent static relaxation, the interfacial layer corresponds to a strongly distorted 3C-SiC-like structure oriented in the (111) direction in which the Si and C atoms are located in the same interfacial plane. The Si atoms form fourfold coordinated Si-C 3N 1 configurations, whereas the C atoms are located in C-Si 3Ti 2 units. All (111) interfaces calculated at 0, 300, and 1400 K have the same atomic configurations. For these interfaces, the Si and C layers correspond to the Si-C network in the (111) direction of 3C-SiC. The Si and C atoms are located in Si-C 3N 1 and C-Si 3Ti 3 configurations, respectively. The ideal tensile strength of all the heterostructures is lower than that of TiN. A comparison with the results obtained from earlier "static" ab initio density functional theory calculations at 0 K for similar heterostructures shows the great advantage of QMD calculations that reveal the effects of thermal activation on structural reconstructions. © 2012 American Physical Society.

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