Разработка и экспериментальные исследования материала для формирования устойчивой настыли и гарнисажа

The main purpose of this paper is to find a solution for saving energy in the cell room. Another purpose of the paper is to find materials suitable for stable side and bottom ledge formation, research the properties of such materials, and study their behavior in cryolite-alumina melts, including selection of the most suitable material. Moreover, the paper is concerned with energy consumption reduction by forming stable side and bottom ledges. Furthermore, as mentioned earlier, several materials have been selected to form stable side and bottom ledges during the post-start-up period. The properties of the selected materials have been analyzedЦелью данной работы является разработка технических решений для повышения энергоэффективности действующих алюминиевых электролизеров, включающая подбор материалов для создания искусственной настыли и экспериментальные исследования свойств выбранных материалов, их поведения в криолитоглиноземных расплавах с последующим выбором материала с оптимальными свойствами, а также снижение удельного расхода электроэнергии за счет создания искусственной настыли и гарнисажа. По результатам работы установлены два вида материалов для создания искусственной настыли: на основе SiС-SiN композиции, на основе магнезита. Оба вида материалов показали хорошую стойкость в расплаве электролита и могут быть рекомендованы для создания искусственной настыл

Statical structural properties of nonideal plasma

[EN] In this article radial distribution functions and static structure factors of nonideal plasma are investigated in the framework of Ornstein-Zernike equation with Percus-Yevick bridge function and Deutch micropotential. It is shown that short range symmetries appear in ionic subsystem of dense plasma and bridge contributions of electrons promote creation of symmetries in ionic subsystem of nonideal plasma.The financial support of the Ministry of education and science of the Republic of Kazakhstan projects # 1099/ GF is gratefully acknowledged.Arkhipov, YV.; Askaruly, A.; Voronkov, V.; Davletov, A.; Ashikbayeva, A.; Tkachenko Gorski, IM. (2013). Statical structural properties of nonideal plasma. International Journal of Mathematics and Physics. 4(1):80-84. http://hdl.handle.net/10251/148680S80844

Разработка и экспериментальные исследования материала для формирования устойчивой настыли и гарнисажа

The main purpose of this paper is to find a solution for saving energy in the cell room. Another purpose of the paper is to find materials suitable for stable side and bottom ledge formation, research the properties of such materials, and study their behavior in cryolite-alumina melts, including selection of the most suitable material. Moreover, the paper is concerned with energy consumption reduction by forming stable side and bottom ledges. Furthermore, as mentioned earlier, several materials have been selected to form stable side and bottom ledges during the post-start-up period. The properties of the selected materials have been analyzedЦелью данной работы является разработка технических решений для повышения энергоэффективности действующих алюминиевых электролизеров, включающая подбор материалов для создания искусственной настыли и экспериментальные исследования свойств выбранных материалов, их поведения в криолитоглиноземных расплавах с последующим выбором материала с оптимальными свойствами, а также снижение удельного расхода электроэнергии за счет создания искусственной настыли и гарнисажа. По результатам работы установлены два вида материалов для создания искусственной настыли: на основе SiС-SiN композиции, на основе магнезита. Оба вида материалов показали хорошую стойкость в расплаве электролита и могут быть рекомендованы для создания искусственной настыл

New Carboxylate Anionic Sm-MOF: Synthesis, Structure and Effect of the Isomorphic Substitution of Sm³⁺ with Gd³⁺ and Tb³⁺ Ions on the Luminescent Properties

Two new compounds, namely {(NMe2H2)}[Ln(TDA)(HCOO)] 0.5H2O, Ln = Sm3+ (Sm-TDA) and Gd3+ (Gd-TDA), where TDA3− is the anion of 1H-1,2,3-triazole-4,5-dicarboxylic acid (H3TDA), were synthesized by the solvothermal method in a DMF:H2O mixture. According to single-crystal X-ray diffraction data, the compounds are 3d-MOFs with an anionic lattice and dimethylammonium cations occupying part of the cavities. Based on these compounds, two series of mixed-metal complexes, [NMe2H2][SmxLn1-x(TDA)(HCOO)], (x = 0.9 (Sm0.9Ln0.1-TDA), x = 0.8 (Sm0.8-Ln0.2-TDA)…Sm0.02Ln0.98-TDA, Ln = Tb, Gd), were also obtained and characterized by powder XRD. The luminescent properties of the compounds were studied and it was shown that the resulting compounds are two- or three-component emitters with the possibility of fine color tuning by changing the intensities of fluorescence and phosphorescence of the ligand, as well as the luminescence of Sm3+ and Tb3+ f-ions

Screened Effective Interaction Potential for Two-Component Plasmas

The linear density response formalism is used to analytically obtain an effective pairwise interaction potential of charged particles that simultaneously takes into account quantum mechanical and quantum statistical effects in weakly and moderately non-ideal plasmas at thermal equilibrium. The static dielectric function is obtained by interpolating long - and short wavelength asymptotic forms of the dielectric function in the random-phase approximation. The exchange effects are neglected in the micropotential, while the quantum-statistical effects are accounted for in the screening. The effective potential constructed in such a way takes a finite value at the origin and proves to be screened at large distances. The thermodynamic properties of two-component plasmas are then calculated and comparison is made with some data available in the literature. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimArkhipov, YV.; Ashikbayeva, AB.; Askaruly, A.; Davletov, AE.; Dubovtsev, DY.; Tkachenko Gorski, IM. (2016). Screened Effective Interaction Potential for Two-Component Plasmas. Contributions to Plasma Physics. 56(5):403-410. doi:10.1002/ctpp.201500129S403410565Deutsch, C. (1977). Nodal expansion in a real matter plasma. Physics Letters A, 60(4), 317-318. doi:10.1016/0375-9601(77)90111-6Ebeling, W., Norman, G. E., Valuev, A. A., & Valuev, I. A. (1999). Quasiclassical Theory and Molecular Dynamics of Two-Component Nonideal Plasmas. Contributions to Plasma Physics, 39(1-2), 61-64. doi:10.1002/ctpp.2150390115Filinov, A. V., Bonitz, M., & Ebeling, W. (2003). Improved Kelbg potential for correlated Coulomb systems. Journal of Physics A: Mathematical and General, 36(22), 5957-5962. doi:10.1088/0305-4470/36/22/317Morozov, I., Reinholz, H., Röpke, G., Wierling, A., & Zwicknagel, G. (2005). Molecular dynamics simulations of optical conductivity of dense plasmas. Physical Review E, 71(6). doi:10.1103/physreve.71.066408Arkhipov, Y. V., & Davletov, A. E. (1998). Screened pseudopotential and static structure factors of semiclassical two-component plasmas. Physics Letters A, 247(4-5), 339-342. doi:10.1016/s0375-9601(98)00613-6Yu. V. Arkhipov F. B. Baimbetov A. E. Davletov K. V. Starikov Pseudopotential theory of dense hot plasmas (Qazaq Universiteti, Almaty, 2002), p. 115 (in Russian).S. Ichimaru Statistical Plasma Physics (Addison-Wesley, New York, 1991), Vol. 1.Moldabekov, Z., Schoof, T., Ludwig, P., Bonitz, M., & Ramazanov, T. (2015). Statically screened ion potential and Bohm potential in a quantum plasma. Physics of Plasmas, 22(10), 102104. doi:10.1063/1.4932051A. I. Akhiezer S. V. Peletminsky Methods of Statistical Physics. International Series in Natural Philosophy (Pergamon Press, Oxford, 1981), Vol. 104.Arista, N. R., & Brandt, W. (1984). Dielectric response of quantum plasmas in thermal equilibrium. Physical Review A, 29(3), 1471-1480. doi:10.1103/physreva.29.1471Arkhipov, Y. V., Askaruly, A., Davletov, A. E., Dubovtsev, D., … Yerimbetova, L. (2014). Interparticle interaction potential in two-component plasmas. Physical Sciences and Technology, 1(1), 55-59. doi:10.26577/phst-2014-1-14Arkhipov, Y. V., Baimbetov, F. B., Davletov, A. E., & Ramazanov, T. S. (1999). Equilibrium Properties of H-Plasma. Contributions to Plasma Physics, 39(6), 495-499. doi:10.1002/ctpp.2150390603Hansen, J. P., & McDonald, I. R. (1981). Microscopic simulation of a strongly coupled hydrogen plasma. Physical Review A, 23(4), 2041-2059. doi:10.1103/physreva.23.2041L. D. Landau E. M. Lifshitz Statistical Physics (Pergamon Press, Oxford, 1980).I. Z. Fisher Statistical Theory of Liquids (University of Chicago Press, Chicago, 1964), p. 335.Tanaka, S., Yan, X.-Z., & Ichimaru, S. (1990). Equation of state and conductivities of dense hydrogen plasmas near the metal-insulator transition. Physical Review A, 41(10), 5616-5625. doi:10.1103/physreva.41.5616Pierleoni, C., Ceperley, D. M., Bernu, B., & Magro, W. R. (1994). Equation of State of the Hydrogen Plasma by Path Integral Monte Carlo Simulation. Physical Review Letters, 73(16), 2145-2149. doi:10.1103/physrevlett.73.2145Chihara, J. (1991). Comment on ‘‘Equation of state and conductivities of dense hydrogen plasmas near the metal-insulator transition’’. Physical Review A, 44(12), 8446-8447. doi:10.1103/physreva.44.8446Ichimaru, S. (1991). Reply to ‘‘Comment on ‘Equation of state and conductivities of dense hydrogen plasmas near the metal-insulator transition’ ’’. Physical Review A, 44(12), 8448-8449. doi:10.1103/physreva.44.844

Heat-Resistant Concrete for Collector Bars of Aluminum Reduction Сells Insulation

In aluminium reduction technology it’s possible to reduce energy consumption and increase current efficiency by decreasing anode-cathode distance and horizontal currents in molten aluminium. Horizontal currents can be decreased by replacing insulation between cathode carbon block and collector bar in area of “ledge border – anode periphery projection on lining”. As an insulator it’s technologically and economically preferable to use refractory concrete which have good adhesion to steel, and chemical resistance against cryolite-alumina melt, sufficiently low compressive strength, which prevents cathode carbon block destruction in case of insulator volume expansion due to electrolyte attack. Results of the refractory concrete properties studies results in order to select the optimal bar’s insulator material composition are presentedПри производстве алюминия снизить удельный расход электроэнергии и повысить выход по току возможно за счет уменьшения расстояния между анодом и катодом МПР с одновременным снижением горизонтальных токов в расплавленном алюминии. Снижение горизонтальных токов может быть достигнуто размещением электроизоляции между катодным угольным блоком и блюмсом на участке «граница настыли – проекция периферии анода на подину». В качестве электроизоляционного материала наиболее технологично и экономично использовать жаростойкий бетон, имеющий хорошую адгезию к стали и химическую стойкость к воздействию криолит-глиноземного расплава, достаточно малую прочность на сжатие, что исключит разрушение катодного угольного блока в случае увеличения объема электроизоляционной вставки под воздействием электролита. В статье приводятся результаты исследований свойств некоторых жаростойких бетонов с целью выбора оптимального состава материала для электроизоляции блюмсов алюминиевого электролизер

Palliative reconstruction of right ventricular outflow tract by using femoral vein allograft in a newborn with hypoplastic pulmonary artery and ventricular septal defect: case report

Treating patients with pulmonary atresia and ventricular septal defect, who have hypoplastic native pulmonary arteries, is a challenge for cardiac surgeons. We have reported a case of successful pulmonary bed rehabilitation using a femoral vein allograft in a patient with pulmonary atresia and ventricular septal defect. No similar cases with a detailed description of surgery stages and pulmonary artery development supported by illustrative materials are described both in the literature. The strategy of rehabilitation of the native pulmonary artery bed facilitates antegrade pulmonary blood flow, increases native pulmonary arteries growth, contributes to successful implementation of staged endovascular interventions and allows for complete repair. The technique of “short” cardiopulmonary bypass with induced ventricular fibrillation is a safe and effective option for such patients. This clinical case might be useful in medical practice of pediatric cardiac surgeons involved in the problem of pulmonary artery rehabilitation.Received 4 June 2018. Revised 4 July 2018. Accepted 5 July 2018.Informed consent: The legal representative (infant’s mother) has voluntarily given her written informed consent to use the infant’s medical data obtained in the course of treatment for scientific purposes and for their publication.Funding: The study had no sponsorship.Conflict of interest: Authors declare no conflict of interest.</p

Heat-Resistant Concrete for Collector Bars of Aluminum Reduction Сells Insulation

In aluminium reduction technology it’s possible to reduce energy consumption and increase current efficiency by decreasing anode-cathode distance and horizontal currents in molten aluminium. Horizontal currents can be decreased by replacing insulation between cathode carbon block and collector bar in area of “ledge border – anode periphery projection on lining”. As an insulator it’s technologically and economically preferable to use refractory concrete which have good adhesion to steel, and chemical resistance against cryolite-alumina melt, sufficiently low compressive strength, which prevents cathode carbon block destruction in case of insulator volume expansion due to electrolyte attack. Results of the refractory concrete properties studies results in order to select the optimal bar’s insulator material composition are presentedПри производстве алюминия снизить удельный расход электроэнергии и повысить выход по току возможно за счет уменьшения расстояния между анодом и катодом МПР с одновременным снижением горизонтальных токов в расплавленном алюминии. Снижение горизонтальных токов может быть достигнуто размещением электроизоляции между катодным угольным блоком и блюмсом на участке «граница настыли – проекция периферии анода на подину». В качестве электроизоляционного материала наиболее технологично и экономично использовать жаростойкий бетон, имеющий хорошую адгезию к стали и химическую стойкость к воздействию криолит-глиноземного расплава, достаточно малую прочность на сжатие, что исключит разрушение катодного угольного блока в случае увеличения объема электроизоляционной вставки под воздействием электролита. В статье приводятся результаты исследований свойств некоторых жаростойких бетонов с целью выбора оптимального состава материала для электроизоляции блюмсов алюминиевого электролизер

"Flora of Russia" on iNaturalist: a dataset

The "Flora of Russia" project on iNaturalist brought together professional scientists and amateur naturalists from all over the country. Over 10,000 people are involved in the data collection.Within 20 months the participants accumulated over 750,000 photo observations of 6,853 species of the Russian flora. This constitutes the largest dataset of open spatial data on the country’s biodiversity and a leading source of data on the current state of the national flora. About 85% of all project data are available under free licenses (CC0, CC-BY, CC-BY-NC) and can be freely used in scientific, educational and environmental activities