The crystallization of thin Sb2Te films with vacuum annealing and an electron beam

Thin Sb2Te films with a thickness gradient were studied via transmission electron microscopy. The processes of forced crystallization were examined with thermal annealing and an electron beam. The crystallization’s general tendencies, including competitive nucleation and growth crystallization, were revealed. As the thickness of the sample increases, the size of the crystals growing in the film enlarges. As the temperature increases, the number of crystals in the film grows. Crystallization under the action of an electron beam occurs mainly by nucleation mechanism

Jean Gottmann as a Visionary and a Critic

This is an introductory paper to the special issue on “The spatial transformation of the urban environment in the conditions of post-industrial development of society” conference dedicated to the 100th anniversary of Jean Gottmann. The conference was held at the Institute of Environmental Management, territory development and urban planning of the Immanuel Kant Baltic Federal University, Kaliningrad, Russia. The special issue presents a number of scientific papers, which represent different view angles on regional development in the context of globalization. Keywords: Jean Gottmann, Economic Geography, Regional Economy, Kaliningrad Region JEL Classifications: N9, O1, R

Russia-European Union Borderlands: Transboundary Gradients, Interactions and Current Challenges

Research on post-Soviet borders emphasizes the need to combine traditional and relatively new approaches to border studies. For Russia, of special importance are the European Union (EU) borders accounting for almost half of the country's international trade. The border districts of Russia and the neighboring EU countries have become natural drivers of regional integration processes. The post-Soviet history of the Russia-EU borderlands has shown dynamism and large dependence on the geopolitical situation, asynchronous changes in the border functions and regimes on different segments, dissimilar economic development rates, asymmetry in interactions between the parties, and a combination of debordering and rebordering processes. Over the past years, the deteriorating geopolitical situation and the economic crisis in Russia increased the risks of a stricter border regime and a significant reduction in border traffic. It is worth examining the correlation of stability and dynamism factors in the border situation. An important factor ensuring the persistence of current differences and problems is the inertia of the settlement system and territorial economic structure at all levels. These factors determine the fluctuations in demographic and socioeconomic indicators and thus contribute to the “difference of potential” ensuring border traffic. The authors analyze the impact of gaps in demographic and socioeconomic indicators on different segments of the Russia-EU border, as well as the asymmetry in transboundary interaction, on their stability in the period of increasing political tensions in 2014-2015. Special attention is paid to the effect of these interactions on the social development and everyday life in the Russian borderlands. It is stressed that, even in the conditions of a serious political crisis and reciprocal sanctions, the barrier functions of the Russia-EU border increased insignificantly. The driving force behind border interactions is pragmatism, which makes it possible for border districts to attract additional resources to solve local problems. Keywords: Border Districts, Russia, European Union, Transboundary Interactions, Asymmetry, Asynchrony, Border Regime, Border Cooperation JEL Classifications: F5, O5, R

Effective microwave-assisted approach to 1,2,3-triazolobenzodiazepinones via tandem Ugi reaction/catalyst-free intramolecular azide–alkyne cycloaddition

A novel catalyst-free synthetic approach to 1,2,3-triazolobenzodiazepinones has been developed and optimized. The Ugi reaction of 2-azidobenzaldehyde, various amines, isocyanides, and acids followed by microwave-assisted intramolecular azide–alkyne cycloaddition (IAAC) gave a series of target heterocyclic compounds in moderate to excellent yields. Surprisingly, the normally required ruthenium-based catalysts were found to not affect the IAAC, only making isolation of the target compounds harder while the microwave-assisted catalyst-free conditions were effective for both terminal and non-terminal alkyne

Invited talk - Nanoscale thermal transport and unconventional thermoelectric phenomena in 2D materials

With 2D materials such as graphene (GR) and hexagonal boron nitride possessing highest known thermal conductivities, one-atom thick nature of these materials makes thermal transport in them drastically dependent on the local environment. Moreover, the equally extraordinary electronic properties of GR such as relativistic carrier dynamics combined with GR highly anisotropic thermal conductance may point to unusual thermoelectric properties. In order to study thermal and thermoelectric phenomena in these nanoscale materials, we applied scanning thermal microscopy (SThM) that uses a sharp tip in contact with the probed surface that can create a controlled local sample temperature rise in the few nm acros spot, while measuring the resulting sample temperature and a heat flow. We used high vacuum environment that eliminates spurious heat dissipation channels to boost accuracy and sensitivity and to allow cryogenic measurements. We show that the thermal resistance of GR on SiO2 is increased by one order of magnitude by the addition of a top layer of MoS2, over the temperature range 150- 300 K with DFT calculations attributing this increase to the phonon transport filtering in the weak vdW coupling and vibrational mismatch between dissimilar 2D materials. By measuring the heat generated in the nanoscale constrictions in monolayer GR devices, we have discovered unconventional thermoelectric Peltier effect due to geometrical shape of 2D material and not requiring a junction of dissimilar materials, with phenomenon confirmed by measuring the Seebeck thermovoltage map due to local heating by the SThM tip. The novel nonlinear thermoelectric phenomena due to “electron wind”, and effects of GR doping and layer number are also reported

The Polarised Valence Quark Distribution from semi-inclusive DIS

The semi-inclusive difference asymmetry A^{h^{+}-h^{-}} for hadrons of opposite charge has been measured by the COMPASS experiment at CERN. The data were collected in the years 2002-2004 using a 160 GeV polarised muon beam scattered off a large polarised ^6LiD target and cover the range 0.006 < x < 0.7 and 1 < Q^2 < 100 (GeV/c)^2. In leading order QCD (LO) the asymmetry A_d^{h^{+}-h^{-}} measures the valence quark polarisation and provides an evaluation of the first moment of Delta u_v + Delta d_v which is found to be equal to 0.40 +- 0.07 (stat.) +- 0.05 (syst.) over the measured range of x at Q^2 = 10 (GeV/c)^2. When combined with the first moment of g_1^d previously measured on the same data, this result favours a non-symmetric polarisation of light quarks Delta u-bar = - Delta d-bar at a confidence level of two standard deviations, in contrast to the often assumed symmetric scenario Delta u-bar = Delta d-bar = Delta s-bar = Delta s.Comment: 7 pages, 3 figures, COMPASS, revised: details added, author list update

Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons

Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise. © 2015