Browsing Внеуниверситетские публикации ученых БНТУ by Title

Now showing items 71-90 of 4309

    • Electric-spark alloying technology for improving the working life of steam turbine rotor blades and equipment for its implementation 

      Belyakov, A. V.; Sarantsev, V. V.; Gorbachev, A. N.; Panteleenko, F. I.; Azarenko, E. L.; Reutov, B. F. (American Society of Civil Engineers, 2016)
      Work is devoted to studying development of technology for forming erosion-resistant coatings for steam turbine rotor blades by electric-spark alloying. Comparative analysis is provided for current methods of steam turbine rotor blade strengthening and repair. It is shown that electric-spark coating formation on leading edges is important, and development of forming technology is ...
      2022-07-29

    • Electric-spark alloying technology for improving the working life of steam turbine rotor blades and equipment for its implementation 

      Belyakov, A. V.; Sarantsev, V. V.; Gorbachev, A. N.; Panteleenko, F. I.; Azarenko, E. L.; Reutov, B. F. (American Society of Civil Engineers, 2016)
      Work is devoted to studying development of technology for forming erosion-resistant coatings for steam turbine rotor blades by electric-spark alloying. Comparative analysis is provided for current methods of steam turbine rotor blade strengthening and repair. It is shown that electric-spark coating formation on leading edges is important, and development of forming technology is ...
      2022-08-09

    • Electron transfer in porphyrin multimolecular self-organized nanostructures 

      Zenkevich, E. I.; Bachilo, S. M.; Shulga, A. M.; Rempel, U.; Willert, A.; Borczyskowski, C. von (1998)
      On the base of of covalent and non-covalent bonds nanoscale self-assembling multiporphyrin arrays with well-defined geometry, the controllable number of interacting components and their spectral and photophysical properties were formed. The deactivation of excited singlet and triplet states was studied using steady-state, time-resolved picosecond fluorescence (∆½≈30 ps) and ...
      2017-05-25

    • Email-маркетинг как прибыльная коммуникация 

      Акулич, М. В. (Промкомплекс, 2017)
      Акулич, М. В. Email-маркетинг как прибыльная коммуникация / М. В. Акулич // Маркетинг: идеи и технологии. – Минск : Промкомплекс, 2017. – № 2. – С. 25-30.
      2019-06-25

    • Energy transfer in ethane-bisporphyrins studied by fluorescence line narrowing and spectral hole burning 

      Mauring, K.; Suisalu, A.; Kikas, J.; Zenkevich, E. I.; Chernook, A. V.; Shulga, A. M.; Gurinovich, G. P. (1995)
      The quasi-line fluorescence excitation spectrum of 1,2-bis (2,3,7,8,12,13,17,18-octaethyl-21H,23 H-porphino) ethane at 4.8 K consists of two subbands with the splitting mean value of 51cm⁻¹, that are ascribed to the donor and the acceptor half of the homodimer. The donor's fluorescence is quenched by an efficient energy transfer to the acceptor. The energy transfer rate of 10¹¹ ...
      2017-05-18

    • Energy transfer in Tm,Ho:KYW crystal and diode-pumped microchip laser operation 

      Kurilchik, S. V.; Gusakova, N. V.; Demesh, M. P.; Yasukevich, A. S.; Kisel, V. E.; Pavlyuk, A. A.; Kuleshov, N. V. (Optical Society of America, 2016)
      An investigation of Tm-Ho energy transfer in Tm(5at.%), Ho(0.4at.%):KYW single crystal by two independent techiques was performed. Based on fluorescence dynamics measurements, energy transfer parameters P71 and P28 for direct (Tm→Ho) and back (Ho→Tm) transfers, respectively, as well as equilibrium constant Θ were evaluated. The obtained results were supported by calculation of ...
      2016-05-12

    • Eportfolio in the system of contemporary education and selfeducation 

      Shumskaya, N. I. (БГУИР, 2016)
      Lifelong learning is turning into a strategic problem for the successful development in the spheres of national economy and education. The article presents some variants of electronic portfolio implementation for qualitative changes in the field of lifelong learning.
      2022-10-25

    • Erratum to: Thermo‑optic coefficients of Nd‑doped anisotropic KGd(WO4)2, YVO4 and GdVO4 laser crystals 

      Loiko, P. A.; Yumashev, K. V.; Kuleshov, N. V.; Pavlyuk, A. A. (2016)
      Erratum to: Thermo‑optic coefficients of Nd‑doped anisotropic KGd(WO4)2, YVO4 and GdVO4 laser crystals / P. A. Loiko [et al.] // Applied Physics B. – 2016. – Vol. 129.
      2017-11-22

    • Estimation of the friction coefficient of a nanostructured composite coating 

      Shil`ko, S. V.; Chernous, D. A.; Ryabchenko, T. V.; Hat`ko, V. V. (Springer : TELOS (The Electronic Library of Science), 2017)
      The frictional-mechanical properties of a thin polymer-ceramic coating obtained by gas-phase impregnation of nanoporous anodic alumina with a fluoropolymer (octafluorocyclobutane) have been investigated. The coefficient of sliding friction of the coating is predicted based on an analysis of contact deformation within the framework of the Winkler elastic foundation hypothesis and ...
      2023-12-15

    • Evaluation of the influence of thermotechnical quality of the external wall on the temperature in the corner of the enclosure on the example of protection made of cellular concrete 

      Shybeka, A. S.; Sakolchyk, D. A. (Колорград, 2018)
      In this article, one cause for unsatisfactory condition of rooms is described and the engineering method for determination of temperature in outer corners of rooms intended for various purposes is offered. It is demonstrated that, with water vapour condensation, several adverse effects arise that can be prevented as early as at the design stage. The study covered the causes of ...
      2019-11-19

    • Extreme Light Concentration Inside Plasmonic Gold and Silver Nanoparticles During Laser Irradiation 

      Astafyeva, L. G.; Pustovalov, V. K. (Springer, 2015)
      Computer modeling of the distributions of laser radiation intensities concentrated inside spherical gold and silver nanoparticles with the radii in the range 10–100 nm was carried out during laser irradiation with wavelengths 400, 532, and 800 nm. Distributions of laser intensity are inhomogeneous for investigated values of nanoparticle sizes and laser wavelengths. Here, we show ...
      2018-09-11

    • Eye-safe 1.55 μm passively Q-switched Er,Yb:GdAl3(BO3)4 diode-pumped laser 

      Gorbachenya, K. N.; Yasukevich, A. S.; Maltsev, V. V.; Leonyuk, N. I.; Kuleshov, N. V. (Optical Society of America, 2016)
      Eye-safe 1.55 μm passively Q-switched Er,Yb:GdAl3(BO3)4 diode-pumped laser / K. N. Gorbachenya [et al.] // Optics Letters. – 2016. – Vol. 41, № 5. – P. 918-921.
      2016-03-28

    • Femtosecond pulse generation with a diode-pumped Yb3+:YVO4 laser 

      Kisel, V. E.; Troshin, A. E.; Shcherbitsky, V. G.; Kuleshov, N. V.; Matrosov, V. N.; Matrosova, T. A.; Kupchenko, M. I.; Brunner, F.; Paschotta, R.; Morier-Genoud, F.; Keller, U. (Optical Society of America, 2005)
      A diode-pumped Yb:YVO4 laser has been passively mode locked for the first time, to our knowledge. 120 fs pulses with an average output power of 300 mW and a peak power as high as 14.5 kW are obtained by use of a semiconductor saturable-absorber mirror for passive mode locking. The optical spectrum has a 10 nm bandwidth (full width at half-maximum) and is centered at 1021 nm.
      2012-01-23

    • Femtosecond pulse operation of a Tm,Ho-codoped crystalline laser near 2 μm 

      Lagatsky, A. A.; Fusari, F.; Calvez, S.; Kurilchik, S. V.; Kisel, V. E.; Kuleshov, N. V.; Dawson, M. D.; Brown, C. T. A.; Sibbett, W. (Optical Society of America, 2010)
      We demonstrate, for the first time to our knowledge, femtosecond-regime mode locking of a Tm,Ho-codoped crystalline laser operating in the 2 μm spectral region. Transform-limited 570 fs pulses were generated at 2055 nm by a Tm,Ho:KY(WO4)2 laser that produced an average output power of 130 mW at a pulse repetition frequency of 118 MHz. Mode locking was achieved using an ion-implanted ...
      2012-01-23

    • First findings of the redeposited Devonian ichthyofauna in the Quaternary deposits of Belarus 

      Plax, D. P. (Научно-производственный центр по геологии, 2014)
      The paper presents some data on the findings of the redeposited skeleton elements of the Devonian vertebrates found for the first time in the Quaternary deposits of Belarus and gives their short description. A conclusion is drawn about the relative age of the rocks enclosing these remains and about the types of their redeposition.
      2019-03-11

    • Fluorescence line narrowing study of cyclopentaneporphyrin chemical dimers at 4.2 K 

      Starukhin, A.; Zenkevich, E. I.; Shulga, A.; Chernook, A. (1996)
      The monomers of Zn-cyclopentanporphyrins (ZnOEP-cycle and ZnOEP-cycle=CH2) and their chemical dimers covalently linked via isocycles (Zn-cyclodimers) have been studied by the method of fluorescence line narrowing (FLN) in tetrahydrofurane-toluene (3:1) glassy matrixes at 4.2 K. Well-resolved fluorescence spectra upon laser excitation into the S₀→S₁ absorption band have been ...
      2017-05-18

    • Formation and optical properties of self-organized pentameric porphyrin arrays 

      Chernook, A. V.; Rempel, U.; Borczyskowski, C. von; Zenkevich, E. I.; Shulga, A. (1996)
      Principles of formation, electronic absorption and fluorescence spectra are reported for self-organized pentameric arrays of tetrapyrrolic macrocycles. In these arrays two molecules of Zn-porphyrin dimers, Zn(II)l,4-bis[5-(10,15,20-tri-p-hexylphenylporphyrinyl)]-benzene ((ZnHTPP)₂) are bound via one molecule of a tetrapyridyl-substituted free base of porphyrin or tetrahydroporphyrin. ...
      2017-05-25

    • Formation of Cone-Shaped Inclusions and Line Defects on the Cz-Si Wafer Surface by the Helium Implantation and DC Nitrogen Plasma Treatment 

      Frantskevich, N. V.; Mazanik, A. V.; Frantskevich, A. V.; Koltunowicz, T.; Zukowski, P. (2011)
      The general goal of this work is to investigate the defects formed on the surface of the Cz-Si wafers subjected to helium implantation, vacuum annealing and nitrogen plasma treatment. The performed scanning electron microscopy study has shown that in the general case two types of surface defects can be formed: cone-shaped inclusions with the base diameter of 0.2-2 mu m and the ...
      2018-03-10

    • Formation Principles and Ligand Dynamics for Nanoassemblies of CdSe Quantum Dots and Functionalized Dye Molecules 

      Blaudeck, T.; Zenkevich, E.; Abdel-Mottaleb, M.; Szwaykowska, K.; Kowerko, D.; Cichos, F.; Borczyskowski, C. von (2012)
      Functional dye molecules, such as porphyrins, attached to CdSe quantum dots (QDs) through anchoring meso-pyridyl substituents, form quasi-stable nanoassemblies. This fact results in photoluminescence (PL) quenching of the QDs both due to Förster resonance energy transfer (FRET) and the formation of non-radiative surface states under conditions of quantum confinement (non-FRET). ...
      2017-05-27

    • From linguistic relativity to ontological 

      Starzhinsky, V. P. (БГУИР, 2017)
      How to construct linguistic-ontological models as the main problem of cognitive linguistics. Describes the contradictions of the cosmos and the relativistic paradigm through an analysis of the hypotheses of the universal linguistic structures n. Chomsky and linguistic relativity Time-linguistic relativity. Identifies the role of logical-cognitive universals in the intellectual ...
      2022-08-15