Now showing items 65-84 of 4281

    • Effect of Vertical Cross-Sectional Shape of Foundation on Settlement and Bearing Capacity of Soils 

      Boiko, I. L.; Alhassan, M. (2013)
      Load-settlement relationships of shallow foundation models with different vertical cross-sectional shapes on different modeled subsoil conditions are presented. Model of shallow foundations with rectangular, wedge and T-shape vertical cross-sections were studied. The study generally shows that bulk of the load resistance of subsoil bases at the instance of shallow foundations ...
      2018-03-10
    • Effective means of activating speaking activities in teaching English as a foreign language 

      Kolyasnev, A. S. (БГУИР, 2016)
      This article is dedicated to estimating the effectiveness of using speaking activities in teaching English as a foreign language. The author gives detailed characteristics of various speaking activation means and provides a classification table of such activities. The wide gamut of language functions, such as greetings, apologizing, congratulating, etc., is being focused on while ...
      2018-06-21
    • 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
    • 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