COMPREHENSIVE ASSESSMENT THE QUALITY OF LIFE IN PATIENTS WITH ESOPHAGEAL ACHALASIA OF III-IV STAGES AFTER EZOPHAGOCARDIOFUNDOPLASTY IN THE DISTANT POSTOPERATIVE PERIOD

The choice of an optimum method of surgical treatment in case of esophageal achalasia of III-IV stage is still a pressing problem. Geller's operation, balloon dilatation and other minimally invasive methods do not allow to achieve the desired effect of smoothing dysphagia. On the other hand, a number of surgeons in case of III-IV stage consider esophageal resection to be more preferable. Due to the attempt to find an optimum method of conservation of the esophagus in case of esophageal achalasia a laparoscopic esophagocardiofundoplasty operation with partial Hill fundoplication was developed. The aim of the research is to assess the long term results of the operation in terms of the quality of life and effectiveness of treatment. The cases of 51 patients suffering from esophageal achalasia of III-IV stage during the period from 2002 to 2016 were included in the research and these cases received special methods developed by the author. The quality of life was assessed with the help of specific questionnaires GERD-HRQL, GIQLI, the dynamics of changes in the weight of the body and the Eckardt scale of indicating the effectiveness of treatment. The results of the research show decrease of indicators on the Eckardt scale from 9.2 ± 0.5 to 1.9 ± 0.2 points, the GERD questionnaire from 17.3 ± 0.8 to 5.9 ± 0.7 points and increase of indicators according to the GIQLI questionnaire from 92.3 ± 1.2 to 122.9 ± 1.5 points and increase in the weight of the body from 22.9 ± 0.6 to 24.7 ± 0.6 kg

Orbitally induced hierarchy of exchange interactions in zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6

We report the revised crystal structure, static and dynamic magnetic properties of quasi-two dimensional honeycomb-lattice silver delafossite Ag3Co2SbO6. The magnetic susceptibility and specific heat data are consistent with the onset of antiferromagnetic long range order at low temperatures with N\'eel temperature TN ~ 21.2 K. In addition, the magnetization curves revealed a field-induced (spin-flop type) transition below TN in moderate magnetic fields. The GGA+U calculations show the importance of the orbital degrees of freedom, which maintain a hierarchy of exchange interaction in the system. The strongest antiferromagnetic exchange coupling was found in the shortest Co-Co pairs and is due to direct and superexchange interactions between the half-filled xz+yz orbitals pointing directly to each other. The other four out of six nearest neighbor exchanges within the cobalt hexagon are suppressed, since for these bonds active half-filled orbitals turned out to be parallel and do not overlap. The electron spin resonance (ESR) spectra reveal a Gaussian shape line attributed to Co2+ ion in octahedral coordination with average effective g-factor g=2.3+/-0.1 at room temperature and shows strong divergence of ESR parameters below 120 K, which imply an extended region of short-range correlations. Based on the results of magnetic and thermodynamic studies in applied fields, we propose the magnetic phase diagram for the new honeycomb-lattice delafossite

DRIVERS FOR THE ADOPTION OF DIGITAL PLATFORMS: AN EMPIRICAL ANALYSIS OF RUSSIAN SMALL AND MEDIUM-SIZED ENTERPRISES

Digitalization is one of the key factors in increasing competitiveness, which signifi cantly expands the capabilities of enterprises, transforming the business models of companies and signifi cantly changing the process of creating value for the consumer. One of the components of the digital economy that can become a driver for the development of entire industries are digital platforms, which in modern conditions may bring signifi cant benefi ts both for large enterprises, and as well as for small and medium-sized enterprises. Despite the high importance of using digital platforms, the use of digital platforms among small and medium-sized businesses is not widespread in Russia. This article aims to identify the factors that contribute to the adoption of digital platforms among small and medium enterprises

THE CONCEPT OF INTERNET OF ENERGY IN RUSSIA: DRIVERS AND PERSPECTIVES

The energy crisis and carbon dioxide emissions have become two of the most important problems in the world. As a very promising solution to these problems is the concept of Internet of Energy (IoE). The Internet of energy is a new energy generation paradigm that develops the revolutionary vision of an intelligent network, and tries to answer the question: how it is possible to achieve coordination and optimization in the macro-energy system.In this study we identify and systematize drivers that promote the implementation of IoE and identify the key benefits that can be obtained by implementing this system

Magnetic phase diagram and possible Kitaev-like behavior of honeycomb-lattice antimonate Na3Co2SbO6

Recent theoretical studies have suggested that Kitaev physics and such effects as formation of a mysterious spin-liquid state can be expected not only in RuCl3 and iridates, but also in conventional $3d$ transition metal compounds. Using DC and AC magnetometry, thermodynamic and $^{23}$Na nuclear magnetic resonance measurements (NMR) we studied such a candidate material Na3Co2SbO6 . A full phase diagram of Na3Co2SbO6 in a wide range of magnetic fields and temperatures is presented. The results demonstrate transformation of the magnetic structure realized at low-temperature and suppression of the AFM order under the external field, the gradual development of the saturation phase, as well as evidence of gapped spin-liquid-like behavior in certain parts of the phase diagram

ФАКТОРЫ, СПОСОБСТВУЮЩИЕ ВНЕДРЕНИЮ ЦИФРОВЫХ ПЛАТФОРМ: ЭМПИРИЧЕСКИЙ АНАЛИЗ РОССИЙСКОГО МАЛОГО И СРЕДНЕГО БИЗНЕСА

Digitalization is one of the key factors in increasing competitiveness, which signifi cantly expands the capabilities of enterprises, transforming the business models of companies and signifi cantly changing the process of creating value for the consumer. One of the components of the digital economy that can become a driver for the development of entire industries are digital platforms, which in modern conditions may bring signifi cant benefi ts both for large enterprises, and as well as for small and medium-sized enterprises. Despite the high importance of using digital platforms, the use of digital platforms among small and medium-sized businesses is not widespread in Russia. This article aims to identify the factors that contribute to the adoption of digital platforms among small and medium enterprises.Цифровизация бизнеса является одним из ключевых факторов повышения конкурентоспособности, которые значительно расширяют возможности предприятий, трансформируя бизнес-модели компаний и существенно изменяя процесс создания ценности для потребителя. Одним из компонентов цифровой экономики, способным стать драйвером развития целых отраслей, являются цифровые платформы, которые в современных условиях дают серьезные преимущества для крупных предприятий, а также и для малого и среднего бизнеса. Несмотря на высокую значимость использования цифровых платформ, в России среди малого и среднего бизнеса они слабо распространены. В настоящей статье выявлены факторы, которые способствуют внедрению цифровых платформ среди некрупных предприятий

THE IMPACT EVALUATION OF INTERNATIONAL ETHNIC TIES ON INDUSTRIAL COMPANIES’ OPPORTUNITY EXPLOITATION WHEN ENTERING FOREIGN MARKETS

The effect of international ethnic communities on international opportunity exploitation of Wenzhou industrial SMEs is examined. The following hypotheses are tested: the hypothesis on the connection between international ethnic ties and international opportunity exploitation; the hypothesis on the mitigation of “liability of foreignness” effects through the international ethnic ties; and finally, the hypothesis of the impact on export barriers. Results of the empirical study, in general, support the derived hypotheses

Preparation and characterization of metastable trigonal layered MSb2O6 phases (M = Co, Ni, Cu, Zn, and Mg) and considerations on FeSb2O6

MSb2O6 compounds (M = Mg, Co, Ni, Cu, Zn) are known in the tetragonal trirutile forms, slightly distorted monoclinically with M = Cu due to the Jahn-Teller effect. In this study, using a low-temperature exchange reaction between ilmenite-type NaSbO3 and molten MSO4-KCl (or MgCl2-KCl) mixtures, these five compositions were prepared for the first time as trigonal layered rosiaite (PbSb2O6)-type phases. Upon heating, they irreversibly transform to the known phases via amorphous intermediates, in contrast to previously studied isostructural MnSb2O6, where the stable phase is structurally related to the metastable phase. The same method was found to be applicable for preparing stable rosiaite-type CdSb2O6. The formula volumes of the new phases show an excellent correlation with the ionic radii (except for M = Cu, for which a Jahn-Teller distortion is suspected) and are 2-3% larger than those for the known forms although all coordination numbers are the same. The crystal structure of CoSb2O6 was refined via the Rietveld method: P31m, a = 5.1318(3) Å, and c = 4.5520(3) Å. Compounds with M = Co and Ni antiferromagnetically order at 11 and 15 K, respectively, whereas the copper compound does not show long-range magnetic order down to 1.5 K. A comparison between the magnetic behavior of the metastable and stable polymorphs was carried out. FeSb2O6 could not be prepared because of the 2Fe2+ + Sb5+ = 2Fe3+ + Sb3+ redox reaction. This electron transfer produces an additional 5s2 shell for Sb and results in a volume increase. A comparison of the formula volume for the stable mixture FeSbO4 + 0.5Sb2O4 with that extrapolated for FeSb2O6 predicted that the trirutile-type FeSb2O6 can be stabilized at high pressures. © 2017 The Royal Society of Chemistry.The work was supported by the Russian Foundation for Basic Research under the grant 14-03-01122. A. N. V. acknowledges the support in part from the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST (no. K2-2016-066) and by Act 211 of the Government of Russian Federation, contract no. 02.A03.21.0006