Browsing by Type: Внеуниверситетские публикации ученых БНТУ "Article"

Now showing items 41-60 of 3560

    • Cooperative up-conversion in Eu3+,Yb3+-doped SiO2–PbO–PbF2–CdF2 oxyfluoride glass 

      Loiko, P. A.; Rachkovskaya, G. E.; Zakharevich, G. B.; Kornienko, A. A.; Dunina, E. B.; Yasukevich, A. S.; Yumashev, K. V. (Elsevier, 2014)
      Novel oxy fluoride glass doped with YbF3 and Eu2O3 is synthesized in the SiO2–PbO–PbF2–CdF2 system by melt quenching technique. Its physical properties, as well as the optical absorption of Eu3+ and Yb3+ ions are studied. Spectroscopic properties of Eu3+ ions are modeled within modified Judd–Ofelt theory, yielding absorption oscillator strength, luminescence branching ratios and ...
      2016-01-05

    • Critical phenomena soft modes and negative Poisson’ ratio 

      Nemtsov, V. B.; Shirko, A. V.; Belov, V. V. (БНТУ, 2011)
      The article phenomena, soft modes and negative Poisson’ ratio are considered on bases at statistical theory.
      2012-06-14

    • CRM-системы: работа на стратегическом и операционном уровнях маркетинга 

      Высторопова, Д.; Гончарова, В. В. (Промкомплекс, 2017)
      Высторопова, Д. CRM-системы: работа на стратегическом и операционном уровнях маркетинга / Д. Высторопова, В. В. Гончарова // Маркетинг: идеи и технологии. – 2017. – № 7. – С. 17-22.
      2019-12-24

    • CW and Q-switched diode-pumped laser operation of Yb 3+:NaLa(MoO4)2 

      Mandrik, A. V.; Troshin, A. E.; Kisel, V. E.; Yasukevich, A. S.; Klavsut, G. N.; Kuleshov, N. V.; Pavlyuk, A. A. (Springer, 2005)
      Continuous wave (CW) and Q-switched diode-pumped laser operation of Yb3+:NaLa(MoO4)2 single crystal was to our knowledge, demonstrated for the first time. A CW output power of 220 mW and slope efficiency of 46% were obtained. Q-switched laser operation was achieved with a pulse duration of 60 ns average output power of 70mW and slope efficiency of 22%.
      2016-03-24

    • Damping of a Solution of Linear Autonomous Difference–Differential Systems with Many Delays Using Feedback 

      Metel’skii, A. V.; Urban, O. I.; Khartovskii, V. E. (2015)
      For linear autonomous difference-differential systems with commensurable delays, the problem of damping the solution by using a linear difference-differential controller with a state feed-back is solved. A generalization of these results to linear autonomous difference-differential systems of neutral type with commensurable delays in the case of a continuous solution is proposed. ...
      2017-11-22

    • Deactivation of excited states in nanostructures containing cu-porphyrin subunit 

      Zenkevich, E. I. (Ивановский государственный химико-технологический университет, 2016)
      Here, we present a semi-review of mutual Belarussian-German collaboration in the field of supramolecular chemistry and photophysics of tetrapyrrole compounds of various types: porphyrin chemical dimers, self-organized multiporphyrin complexes, ordered aggregates of photosynthetic pigments and nanoassemblies based on semiconductor CdSe/ZnS quantum dots and porphyrins. A special ...
      2020-11-11

    • Development of the theory of computation of pivotally-connected beams on an elastic foundation taking into account their physical nonlinearity 

      Bosakov, S. V.; Kozunova, O. (Колорград, 2019)
      This work presents a brief review of the literature on the theory and technique of computation of pivotally-connected structures on a linearly-elastic foundation. The authors refer to the works of B.G.Korenev, G.Ya.Popov, I.A.Simvulidi, R.V.Serebryany and A.G.Yuryev, in which investigations for calculating the pivotally-connected beams and slabs on an elastic foundation are ...
      2020-10-08

    • Die Stellung Weißrusslands in der Zollunion 

      Brovka, G. M. (Verlag Recht und Wirtschaft GmbH, 2011)
      Brovka, G. M. Die Stellung Weißrusslands in der Zollunion / G. M. Brovka // Rechtsfragen der Eurasischen Zollunion: Tagungsband zum 15. Munsteraner Aubenwirtschaftsrechtstag 2010 / hrsg. Dirk Ehlers, Hans-Michael Wolffgang, Ulrich Jan Schroder. – Frankfurt am Main: Verlag Recht und Wirtschaft GmbH, 2011. – S. 75-91.
      2019-04-10

    • Diode-pumped passively mode-locked Er,Yb:YAl3(BO3)4laser at 1.5-1.6 μm 

      Lagatsky, A. A.; Kisel, V. E.; Troshin, A. E.; Tolstik, N. A.; Kuleshov, N. V.; Leonyuk, N. I.; Zhukov, A. E.; Rafailov, E. U.; Sibbett, W. (2008)
      We report the first demonstration to our knowledge of passive mode locking in a diode-pumped Er3+ and Yb3+ codoped YAl3(BO3)4 laser operating in the 1.5-1.6 μm spectral region. Low-loss GaInNAs quantum-well semiconductor saturable absorber mirrors are used for the initiation and stabilization of the ultrashort-pulse generation. Pulses as short as 4.8 ps were generated at 1530 nm ...
      2012-01-23

    • Diode-pumped passively Q-switched self-frequency-doubled ND:CNGS laser 

      Zhang, X.; Zhou, Y.; Yasukevich, A. S.; Loiko, P. A.; Mateos, X.; Xu, X.; Guo, S.; Wang, Z. (Optical Society of America, 2017)
      With Cr4+:YAG as a saturable absorber, a passively Q-switched self-frequencydoubled (SFD) laser based on a trigonal Nd:Ca3NbGa3Si2O14 (Nd:CNGS) silicate crystal was demonstrated for the first time. The maximum average output power at 532 nm was 16.2 mW, and the corresponding pulse repetition frequency, single pulse energy, pulse duration and peak power were 2.25 kHz, 7.2 μJ, 13.7 ...
      2023-12-15

    • Directed energy transfer due to orientational broadenning of energy levels in photosynthetic pigment solutions 

      Rubinov, A. N.; Zenkevich, E. I.; Nemkovich, N. A.; Tomin, V. I. (1982)
      The directed non-radiative energy transfer through monomeric molecules of chlorophyll “a” and pheophytin “a” at high concentrations (c ~ 10⁻²) in a rigid matrix of polyvinylbutyral has been found by using the nanosecond laser spectrofluorimeter. The phenomenon is caused by orientational broadening of pigment molecular spectra owing to its interaction with a solvent. The observed ...
      2017-05-18

    • Double electrical layer in the cathode spot 

      Gretchikhin, L. I.; Latushkina, S. D.; Kamarouskaya, V. M. (2016)
      The paper describes a new phenomenon of the generation of the double electrical layer above the cathode spot surface. The neutralization of this layer leads to the reverse current of free electrons, generated due to negative ions ionization. The negatively charged flame of the cathode spot periodically ignites and attenuates, so the duration of the cathode spot existence is defined ...
      2020-11-03

    • Effect of diffusion of magnetic particles on the parameters of the magnetic fluid seal: A numerical simulation 

      Krakov, M. S.; Nikiforov, I. V. (Institute of Physics, University of Latvia, 2014)
      In the paper, a motion of magnetic nanoparticles in a high gradient magnetic field and its correlation with the characteristics of the magnetic fluid seal are numerically studied. The neutral curve defining a range of parameters, where the liquid keeps fluidity, is found. It is shown that the concentration of particles during the initial time period grows linearly and then the ...
      2016-03-29

    • The effective technique of solving of reduced characteristics equations of radiation transfer theory 

      Borovik, F. N.; Rogovtsov, N. N. (2004)
      An integral equation of radiation transfer theory is considered. The method to solution of this equation based on its reduction to an infinity system of linear algebraic equations is presented. The solvability conditions in L2-space are given and the explicit series solution is constructed.
      2020-11-17

    • Efficiency of using cables on 6-110 kv with sticked polyethylene isolation 

      Korotkevich, M. A.; Podgaisky, S.; Golomuzdov, A. (EDP Sciences, 2017)
      The expediency of using more expensive 6-10 kV cables with XLPE insulation was proved by us on the basis of the method of multi-purpose optimization, which took into account both the resulted costs for the construction and operation of cable lines, and the reliability of its operation, as well as the convenience of installation. Without compensation of capacitive currents, ...
      2022-07-29

    • Efficient 1 W continuous-wave diode-pumped Er,Yb:YAl3(BO3)4 laser 

      Tolstik, N. A.; Kurilchik, S. V.; Kisel, V. E.; Kuleshov, N. V.; Maltsev, V. V.; Pilipenko, O. V.; Koporulina, E. V.; Leonyuk, N. I. (Optical Society of America, 2007)
      We report the spectroscopy and high-power continuous-wave (CW) diode-pumped laser operation of Er:Yb:YAl3(BO3)4 crystal. Absorption and stimulated emission spectra, emission lifetimes, and efficiency of energy transfer from Yb3+ to Er3+ ions were determined. A CW Er:Yb:YAB laser emitting at 1602, 1555, and 1531 nm with output power as high as 1 W and slope efficiency up to 35% ...
      2012-01-23

    • Efficient diode-pumped Tm:KYW 1.9-μm microchip laser with 1 W cw output power 

      Gaponenko, M. S.; Kuleshov, N. V.; Südmeyer, T. (Optical Society of America, 2014)
      We report on a diode-pumped Tm:KYW microchip laser generating 1 W continuous-wave output power. The laser operates at a wavelength of 1.94 μm in the fundamental TEM00 mode with 71% slope efficiency relative to the absorbed pump radiation and 59% slope efficiency relative to the incident pump radiation. The optical-to-optical laser efficiency is 43%.
      2016-01-05

    • 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