Browsing Внеуниверситетские публикации ученых БНТУ by Title

Now showing items 116-135 of 4309

    • Ligand dynamics and temperature effects upon formation of nanocomposites based on semiconductor CdSе/ZnS quantum dots and porphyrins: ensemble and single object measurements 

      Zenkevich, E. I.; Blaudeck, T.; Kowerko, D.; Stupak, A. P.; Cichos, F.; Borczyskowski, C. von (2012)
      Dye molecules with pyridyl side substituents (porphyrins and heterocyclic perylene diimides) coordinatively attached to semiconductor CdSe/ZnS quantum dots (QDs) surface form quasi-stable “QD-Dye” nanocomposites of various geometry in the competition with capping molecules (tri-n-octyl phosphine oxide or long chain amines) exchange. This results in photoluminescence (PL) quenching ...
      2017-05-27

    • Light-absorption selection of nanoparticles and nanofluids containing nanoparticles for their effective heating by solar radiation 

      Pustovalov, V. K.; Astafyeva, L.G.; Fritzsche, W. (Springer, 2017)
      Light-absorption selection of single nanoparticle for solar radiation requires the simultaneous fulfillment of all of the following novel conditions—maximal close (overlap) of the dependence of nanoparticle efficiency absorption factor on wavelength with the dependence solar irradiance, predominant role of nanoparticle absorption over its scattering, the use of maximal values of ...
      2023-05-10

    • Limit state design of slender steel webs associated with the shear buckling 

      Martynov, Y. S.; Nadolski, V. V. (2016)
      The interaction of some cases ultimate limit state with the serviceability limit states is established. Thereby the single and multiple local buckling of the web are considered as serviceability limit state for checking shear resistance according to Euro code 3 «Design of steel structures». The method for checking shear resistance with the aforementioned serviceability limit state ...
      2021-02-10

    • Linguistic and acoustic resources of the computer system of spoken english intonation training 

      Zdaranok, Y. A. (БГУИР, 2017)
      This paper considers supra-segmental parameters as intonation, stress and speech rhythm, which are related not only to the correct articulation of sounds of the target language, but the correct pronunciation depends on prosodic structures presented by a standard intonation patterns. Linguistic and acoustic resources are needed for computer-aided intonation training because they ...
      2022-08-15

    • Linguistic and acoustic resources of the computer-based system for analysis and interpretation of speech intonation 

      Zdaranok, Y. A. (Ульяновский ГТУ, 2017)
      This paper considers suprasegmental parameters such as intonation, stress and speech rhythm. Correct articulation of sounds and correct pronunciation in the target language depend on prosodic structures presented by standard intonation patterns. Linguistic and acoustic resources provide the basis for computer-aided intonation training in and outside the classroom. There is a great ...
      2021-06-28

    • Low-power gas sensor on nanostructured dielectric membrane 

      Belahurov, E. A.; Khatko, V. V.; Gorokh, G. G.; Zakhlebayeva, A. I.; Reutskaya, O. G.; Taratyn, I. A. (Новые технологии, 2015)
      The article presents a technology for manufacture of a gas sensor with a two-layer nanostructured dielectric membrane on a silicon substrate and its characteristics. Selection of the correct mathematical model ensures a good correlation between the experimental and calculated current-voltage characteristics of the sensor and makes it possible to evaluate the effect of porosity ...
      2018-07-06

    • Luminescence of oxyfluoride glasses containing YB3+–RE3+ ions 

      Loiko, P. A.; Rachkovskaya, G. E.; Zakharevich, G. B.; Skoptsov, N. A.; Yumashev, K. V. (2016)
      The optical absorption and up-conversion luminescence of oxyfluoride glasses in the system SiO2–PbO–PbF2–CdF2 coactivated by Yb3+–RE3+ ions (where RE = Er, Tm, Ho, Dy, Pr, or Tb) are investigated. Excitation with a laser diode in the IR range (960 nm) gives intense green, blue, and red luminescence. The color characteristics of the up-conversion luminescence in the CIE 1931 system ...
      2017-11-22

    • 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