Now showing items 123-142 of 4309

    • Manifestation of nonplanarity effects and charge-transfer interactions in spectral and kinetic properties of triplet states of sterically strained octaethylporphyrins 

      Knyukshto, V. N.; Sagun, E. I.; Shulga, A. M.; Starukhin, D. A.; Bachilo, S. M.; Zenkevich, E. I. (2001)
      Properties of the triplet states of octaethylporphyrins with the steric hindrance (free bases and Pd complexes) are studied by the methods of stationary and kinetic spectroscopy in the temperature range from 77 to 293 K. The mono-mesophenyl substitution results in a decrease in the quantum yield and shortening of the phosphorescence lifetime of Pd complexes by 250–3500 times in ...
      2017-05-26
    • Method of comprehensive surface hardening of steel products 

      Kovalchuk, A. V.; Konstantinov, S. V.; Bogdanchik, M. I. (ВГУ имени П. М. Машерова, 2014)
      В статье рассмотрен метод комплексного поверхностного упрочнения изделий из стали.
      2015-03-25
    • Methodology for determining the calculation of the standard for the number of medical visits 

      Palonik, I. S.; Shandora, N. I. (Издательство БГУ, 2017)
      The author оf article analyses out-patient care in the Republic of Belarus. There is considered the need for changes in primary health care to improve the efficiency of the health care system. Changes should be aimed at reducing costs and creating a model of managed care based on volume planning and resource support, taking into account the needs for medical services. There is ...
      2023-01-23
    • Micro-Raman Investigation of Hydrogen Localized in Cone-Shaped Defects Formed on the Silicon Wafer Surface 

      Frantskevich, N. V.; Fedotov, A. K.; Frantskevich, A. V.; Mazanik, N. V. (2014)
      The goal of this work is the micro-Raman study of molecular hydrogen localized in cone-shaped defects, which are formed on the surface of previously helium implanted and annealed Czochralski Si wafers as a result of hydrogen plasma treatment. The line at ≈ 4158 cm corresponding to molecular hydrogen is observed in the Raman spectra when the laser beam is focused both on cone-shaped ...
      2017-11-04
    • Microchip laser operation of Tm,Ho:KLu(WO4)2 crystal 

      Loiko, P.; Serres, J. M.; Mateos, X.; Yumashev, K.; Kuleshov, N.; Petrov, V.; Griebner, U.; Aguilo, M.; Diaz, F. (2014)
      A microchip laser is realized on the basis of a monoclinic Tm,Ho-codoped KLu(WO4)2 crystal cut for light propagation along the Ng optical indicatrix axis. This crystal cut provides positive thermal lens with extremely weak astigmatism, S/M = 4%. High sensitivity factors, M = dD/dPabs, of 24.9 and 24.1 m−1/W for the mg- and pg- tangential planes are calculated with respect to the ...
      2017-11-15
    • Modal analysis of three-dimensional finite element models of reinforced concrete structures 

      Basakou, S. V.; Liashkevich, O. N. (Колорград, 2018)
      In this article modal analysis of reinforced concrete structures by the Finite Element Method is reviewed. A list of simplifications – implemented within idealization of the structural scheme at the calculation phase – that reduce the reliability of the results is provided. Out of the necessity to use idealizations, the Finite Element Method allows for the possibility of creating ...
      2019-10-30
    • Modeling of an Impact of Thin Insulating Film on the Electrode Surface on Discharge Ignition in Mercury Illuminating Lamps at Low Ambient Temperatures 

      Bondarenko, G. G.; Fisher, M. R.; Kristya, V. I.; Żukowsk, P. (БНТУ, 2019)
      The mixture of argon and mercury vapor with temperature-dependent composition is used as the background gas in different types of gas discharge illuminating lamps. The aim of this work was to develop a model of the low-current discharge in an argon-mercury mixture at presence of a thin insulating film on the cathode and to investigate the influence of film on the discharge ignition ...
      2019-10-01
    • Modeling of spraying with time-dependent material feed rate 

      Stepanenko, D. A. (2007)
      This paper presents a mathematical model for predicting the thickness of coatings deposited by means of spraying onto rotating parts with circular symmetry, for the case of time-dependent material feed rate. A procedure for calculating the material feed rate control law providing production of coatings with uniform thickness or coatings with a predefined law of thickness variation ...
      2018-03-10
    • Modern approach in natural language processing systems for summarization 

      Makarych, M. V. (Томский политехнический университет, 2016)
      Makarych, M. V. Modern approach in natural language processing systems for summarization / M. V. Makarych // Межкультурная коммуникация: теория и практика : сборник научных трудов XVI международной научно-практической конференции, (Томск, 11-13 октября 2016 г.) / Томский политехнический университет ; ред. Ю. В. Кобенко. – Томск : Томский политехнический университет, 2016. – С. 303-306.
      2019-09-30
    • Modern trends in improvement of steel heating technology in continuous furnaces 

      Timoshpolskiy, V. I.; Temlyantsev, M. V.; Trusova, I. A. (2016)
      The principles and approaches in the development and improvement of steel heating technology in the furnaces of rolling manufacture of various structural design, based on the systematic study of thermal physical and technological processes, including mathematical modeling, industrial experiments, development of rational temperature-thermal modes.
      2018-02-27
    • Multifrequency laser diagnostics of vibrational nonequilibrium gas media containing CO2 molecules 

      Arshinov, K. I.; Krapivnaya, O. N.; Nevdakh, V. V. (Pleiades Publishing, 2016)
      The technique for multifrequency diagnostics of a vibrational nonequilibrium gas mixture that contains CO2 molecules is proposed. The technique uses data on unsaturated gains at lines of the 0001– [1000, 0200]I, II and 0002–[1001, 0201]I, II transitions obtained with the help of a tunable CO2 laser. Results of the study of the influence of accuracy of gain measurements and the ...
      2022-07-29
    • Multistep photoinduced electron transfer in self-organised nano-scale porphyrin triads 

      Zenkevich, E. I.; Shulga, A. M.; Borczyskowski, C. von (2002)
      Well-defined structurally organised porphyrin triads of a controlled geometry andnanoscale size have been formed in liquid solutions using the combination of a covalent approach and non-covalent self-assembly. The triads contain zinc-octaethylporphyrin chemical dimer, (ZnOEP)₂Ph, with covalently linked electron acceptors (p-benzoquinone, Q or pyromellitimide, Pim), and additional ...
      2017-05-26
    • Negative ions of atoms and diatomic and triatomic molecules 

      Gretchikhin, L. I.; Kamarouskaya, V. M. (2016)
      Electron affinity is not determined by solving the Schrödinger equation, but by using a wide range of various types of interactions. In atoms, the bound between the external electron and the integrated electric dipole moment of a neutral atom mainly contributes to electron affinity. In diatomic molecules, electron affinity is defined mainly by the interaction of the external ...
      2020-11-03
    • NFC - эффективный инструмент современного телемаркетинга 

      Павлова, К.; Гончарова, В. В. (Промкомплекс, 2013)
      Павлова, К. NFC - эффективный инструмент современного телемаркетинга / К. Павлова, В. В. Гончарова // Маркетинг: идеи и технологии. - 2013. - № 7. - С. 59-61.
      2015-01-31
    • NH-tautomerism and visible absorption spectra of porphyrins with nonsymmetrical substitution: oscillator model and mo calculations 

      Zenkevich, E. I.; Shulga, A. M.; Filatov, I. V.; Chernook, A. V.; Gurinovich, G. P. (1985)
      On the basis or experiments Ihe oscillator model has been established for individual NH tautomers or porphyrins with asymmetrical substitution. CNDO/2 calculations explain the inversion of Q ₓ (O.O) and Q y (O.O) electronic transition intensities in NH tautomers as a consequence of the inversion of LUMO coefficients c₁ and c₂ for fixed x and y molecular oscillators.
      2017-05-18
    • Nonlinear thermo-optical properties of two-layered spherical system of gold nanoparticle core and water vapor shell during initial stage of shell expansion 

      Pustovalov, V. K.; Astafyeva, L. G. (2011)
      Nonlinear thermo-optical properties of two-layered spherical system of gold nanoparticle core and water vapor shell, created under laser heating of nanoparticle in water, were theoretically investigated. Vapor shell expansion leads to decreasing up to one to two orders of magnitude in comparison with initial values of scattering and extinction of the radiation with wavelengths ...
      2018-03-06
    • On the bonding strength of Fe-based self-fluxing alloy coating deposited by different methods on the steel substrate 

      Feldshtein, E.; Kardapolava, M. A.; Dyachenko, O. V. (University of Zielona Góra, 2018)
      In the present paper, the bonding strength of Fe-based self-fluxing alloy coating deposited by plasma spraying, gluing and laser remelting and alloying on the steel substrate have been investigated. When flame melting, a globular structure is formed. Against the background of the solid solution carbide-boride phases are clearly distinguishable, between which the Fe-Fe2B and Fe-FeB ...
      2018-09-13
    • On the formation features and some material properties of the coating formed by laser cladding of a nicrbsi self-fluxing alloy 

      Devoino, O.; Feldshtein, E.; Kardapolava, M.; Lutsko, N. (Springer, 2018)
      In the present paper, the influence of laser cladding conditions on the powder flow conditions as well as the microstructure, phases, and microhardness of a Ni-based self-fluxing alloy coating is studied. The formation regularities of a coating microstructure with different cladding conditions as well as patterns of element distribution over the coating depth and in the transient ...
      2023-10-05
    • Operation of a Spark-Ignition Engine on Mixtures of Petrol and N-Butanol 

      Kukharonak, H.; Ivashko, V.; Pukalskas, S.; Rimkus, A.; Matijosius, J. (2017)
      The Article analyses the use of n-butanol (biobutanol) in mixtures with petrol in spark-ignition (SI) internal combustion engines (ICE). Analysis of the scientific literature allowed determining that n-butanol content had a different effect on the same engine parameters in different tests, thus a decision was made to conduct additional research, where, having assembled the necessary ...
      2018-03-10
    • Opportunities for bioenergy in the Baltic Sea Region 

      Silveira, S.; Khatiwada, D.; Leduc, S.; Kraxner, F.; Venkata, B. K.; Tilvikine, V.; Gaubyte, V.; Tauraite, E.; Romagnoli, F.; Blumberga, D.; Kundas, S. P.; Kalinichenko, A. S.; Peterson, K.; Utsar, K.; Vigants, E. (2017)
      Security of energy supply, promotion of the bio-economy, nutrient recycling, and innovation are prioritized policy areas in the EU Strategy for the Baltic Sea Region (EUBSR). The Baltic Sea Region (BSR) has a great bioenergy potential worth exploring in this context. This paper explores the state-of-art of bioenergy systems and synergies with eco-systems services in the BSR region ...
      2021-07-19