Browsing Внеуниверситетские публикации ученых БНТУ by Title

Now showing items 180-199 of 4309

    • Spectroscopy and femtosecond laser performance of Yb3+:YAlO3 crystal 

      Kisel, V. E.; Kurilchik, S. V.; Yasukevich, A. S.; Grigoriev, S. V.; Smirnova, S. A.; Kuleshov, N. V. (Optical Society of America, 2008)
      We report what we believe to be the first demonstration of cw and passively mode-locked Yb3+:YAlO3(Yb:YAP) laser operation under diode pumping. Spectroscopic properties of a 0.6 at.%Yb3+-doped YAP single crystal were investigated. Output power up to 1.2 W with slope efficiency of 64.5% in the cw regime and 225 fs pulse duration with average power of 0.8 W from a mode-locked Yb:YAP ...
      2012-01-23

    • Spectroscopy of interchromophoric interactions in self-organized porphyrin and chlorin complexes 

      Zenkevich, E. I.; Shulga, A. M.; Chernook, A. V.; Rempel, U.; Borczyskowski, C. von (1995)
      Spectral-luminescent properties of multimolecular complexes (triads and pentads, complexation constants range from 5∙10⁶ to 5∙10⁷ M⁻¹) formed by two-fold coordination of dipyridyl and tetra-pyridyl substituted porphyrin or related molecules with Zn-porphyrin and Zn-chlorin dimers having various spacers between macrocycles (-CH₂-CH₂- or phenyl ring) have been studied in methylcyclohexane ...
      2017-05-18

    • Spectroscopy of tetragonal Eu:NaGd(WO4)2 crystal 

      Loiko, P. A.; Vilejshikova, E. V.; Mateos, X.; Serres, J. M.; Dashkevich, V. I.; Orlovich, V. A.; Yasukevich, A. S.; Kuleshov, N. V.; Yumashev, K. V.; Grigoriev, S. V.; Vatnik, S. M.; Bagaev, S. N.; Pavlyuk, A. A. (2016)
      We report on growth and detailed spectroscopic study of Eu3ю-doped tetragonal sodium gadolinium double tungstate, Eu:NaGd(WO4)2, a new promising crystal for deep-red lasers. Large-volume crystal doped with 4.9 at.% Eu is grown by Czochralski method along the [001] crystallographic direction. Absorption of Eu3ю ions is studied at room temperature (RT) and at 6 K. For the absorption ...
      2017-11-18

    • Statics of Magnetic Fluid Drop with Compound Magnetic Core in a Wedge-Shaped Channel 

      Bashtovoi, V. G.; Klimovich, C.; Motsar, A.; Reks, A. G.; Ryapolov, P. A.; Storozhenko, A.; Shabanova, I. (Sumy State University, 2013)
      A behavior of magnetic fluid drop with compound magnetic core in a wedge-shaped channel was studied experimentally. The study examines influence of magnetic fluid properties, its volume and magnetic field on statics of the system compound magnet – magnetic fluid drop in wedge-shaped channel. The possibility to change the static conditions of such system by altering magnetic field ...
      2016-03-29

    • Steric interactions influence on electron transfer efficiency in meso-nitrophenylporphyrins and their chemical dimers 

      Knyukshto, V. N.; Zenkevich, E. I.; Sagun, E. I.; Shulga, A. M.; Starukhin, D. A.; Bachilo, S. M. (2001)
      Steric interactions upon mono- and di-meso-phenyl substitution in octaethylporphyrins (OEP) and their chemical dimers with the phenyl spacer manifests itself in the dramatical T₁-state lifetimes shortening at 293 K (from ms down to μs in degassed toluene solutions) without any influence on spectral-kinetic parameters of S₀- and S₁-states. This effect is explained by non-planar ...
      2017-05-26

    • Stokes and anti-Stokes luminescence from cubic elpasolite Cs2NaYF6 crystals doped with Er3+and Yb3+ ions 

      Loiko, P. A.; Khaidukov, N. M.; Mendez-Ramos, J.; Vilejshikova, E. V.; Skoptsov, N. A.; Yumashev, K. V. (Elsevier, 2016)
      Er3þ and Yb3þ doped cubic elpasolite Cs2NaYF6 crystals including stoichiometric compositions Cs2NaErF6 and Cs2NaYbF6 have been synthesized under hydrothermal conditions. Absorption, stimulated-emission and gain cross-sections spectra have been determined for the 2F5/2-2F7/2 (Yb3þ) and 4I13/2-4I15/2 (Er3þ) transitions at room-temperature. The maximum σSE values are 1.8 10 21 cm2 ...
      2016-05-12

    • Stratigraphic ichthyofauna assemblages of the Devonian deposits in the east and southeast of Belarus 

      Plax, D. P. (Научно-производственный центр по геологии, 2015)
      The paper presents the results of the palaeoichthyological study of the сoге from fifteen boreho/es drilled in the territory of the eastern part of the Pripyat Trough, Bobruysk Buried Ridge, Zhlobin Saddle and the northwestern slope of the Voronezh Antec/ise. Some references with data of the Devonian ichthyofauna within the investigated area are cited to complete the information. ...
      2019-03-11

    • Stratigraphy of middle devonian deposits of the western part of the Pripyat Trough (according то results of the study of ichthyofauna) 

      Plax, D. P.; Kruchek, S. A. (Научно-производственный центр по геологии, 2014)
      The paper presents the results of palaeoichthyological study of the core from the Pinsk-10 and Pinsk-26 boreholes, drilled in the territory of the western part of the Pripyat Trough within the Turov and Starobin Centroclines. References with data on vertebrates of the Middle Devonian within the investigated area are given to complete the information. According to the vertebrate ...
      2019-03-11

    • Structural Dynamics and Relaxation Processes with Participation of Excited Singlet and Triplet States in Sterically Hindered Porphyrins and Their Chemical Dimers 

      Zenkevich, E. I. (2014)
      Paper presents an overview of mutual Belarussian-Russian collaboration in the field of sterically hindered porphyrins compared with the relevant literature data. Typically, the conformational dynamics of a non-planar tetrapyrrole macrocycle at 295 K manifests itself in bathochromic absorption and fluorescence shifts (∆ν ~ 1100 cm⁻¹), the increase of the Stokes shift (∆νₛ ~ 900 ...
      2017-05-27

    • Structure and nonlinear optical properties of novel transparent glass-ceramics based on Co2+:ZnO nanocrystals 

      Loiko, P. A.; Dymshits, O. S.; Vitkin, V. V.; Skoptsov, N. A.; Zhilin, A. A.; Shemchuk, D. V.; Tsenter, M. Ya.; Bogdanov, K. V.; Malyarevich, A. M.; Glazunov, I. V.; Mateos, X.; Yumashev, K. V. (2016)
      Transparent glass-ceramics (GCs) based on Co2+:ZnO nanocrystals (mean diameter, 11 nm) are synthesized on the basis of cobalt-doped glasses of the K2O–ZnO–Al2O3–SiO2 system. For these GCs, the absorption band related to the 4A2(4F) → 4T1(4F) transition of Co2+ ions in tetrahedral sites spans until ~1.73 μm. Saturation of the absorption is demonstrated at 1.54 μm, with a saturation ...
      2017-11-18

    • Structure-phase condition and tribological properties of coatings based on self-fluxing nickel alloy PG-12N-01 after laser surfacing 

      Devoino, O. G.; Kardapolava, M. A.; Lutsko, N. I.; Feldshtein, E. E. (Kluwer Academic/Plenum Publishers, 2017)
      Some parameters of laser surfacing of self-fluxing nickel alloy PG-12N-01 are considered. Different structures containing a low-melting -Ni – Ni3B eutectic and a -Ni – Cr3C2 eutectic that crystallizes at a higher temperature and forms the strength skeleton of the coating may form depending on the rate of the surfacing. The effect of the rate of the surfacing on the wear resistance ...
      2022-08-09

    • Surface engineering of slider valves of fluid power motors made of tool steels by using boriding saturation mixture 

      Konstantinov, V. M.; Dashkevich, V. G.; Kovalchuk, A. V. (Aleksandras Stulginskis University, 2015)
      The technique for producing compact boride layers for the effective hardening of slider valves of fluidpower motors and distributives valve of Belarusian origin made of tool steel has been designed. The effect of temperature and time parameters in boriding powder saturation mixture on the thickness and phase composition of the diffusion layers and the morphology of the upper ...
      2016-03-09

    • Synthesis of Low-Viscosity Parting Lubricants Based on Domestically-Made Solvents and Oils with Improved Organoleptic Characteristics 

      Bursau, M.; Dimitriadi, N.; Ivashko, L.; Yukhnevskiy, P. I. (Колорград, 2017)
      The article describes the results of studies carried out in Institute BelNIIS Republican Unitary Enterprise (RUE) in synthesis of especially low-viscosity parting lubricants with the kinematic viscosity about 2 mm2 /s at 20 °C; the need for these lubricants arose at several enterprises in the Republic of Belarus as a result of commissioning of several imported process lines for ...
      2021-04-29

    • Teaching business english on the basis of case-study method 

      Sologub, I. M. (БГУИР, 2016)
      This article describes case-study method as a teaching method that uses simulation as a means aimed at the formation of students‘ professional skills. It enables to interest students in studying the subject as well as to collect, process and analyze the information which has been studied. It also shows how case-study method can be used in teaching Business English.
      2022-10-24

    • Teaching of professionally oriented dialogic communication for future economists 

      Pavlyuchenka, I. M. (БГУИР, 2016)
      The present article covers the main methods, used while teaching dialogic communication for future economists. The most functional methods for dialogic teaching are considered. The arguments proving the efficiency of these methods are given.
      2022-10-24

    • Temperature and combustion kinetics of wood pellet char in a fluidized bed 

      Palchonok, G. I.; Borodulya, A.; Golubeva, V.; Leckner, B.; Hansson, K.-M.; Tullin, C.; Johnsson, J. E. (ИТМО имени А. В. Лыкова, 2000)
      Temperature and combustion kinetics of wood pellet char in a fluidized bed / G. I. Palchonok [et al.] // Тепломассообмен. ММФ―2000 : IV Минский международный форум, Минск, 22―26 мая 2000 г. : в 11 т. / Национальная академия наук Беларуси, Институт тепло- и массообмена им. А. В. Лыкова ; редкол.: В. А. Бородуля [и др.]. – Минск : ИТМО имени А. В. Лыкова, 2000. - Т. 6 : Тепломассообмен ...
      2020-11-12

    • Temperature dependence of green upconversion fluorescence of fluorophosphate and tellurite-barium glasses for application in temperature sensors 

      Varaksa, Y.; Sinitsyn, G.; Khodasevich, М. А.; Yasukevich, A. S.; Demesh, M. P.; Aseev, V. (Издательский центр БГУ, 2015)
      Temperature dependences are studied of green upconversion fluorescence of the five erbium- and ytterbium-doped glasses (three fluorophosphate glasses, one of which is additionally doped with Tm, and two tellurite-baruim ones) in the temperature range from 30°C to 150°C. The ratio of intensities is determined of two fluorescence bands at about 515-525 nm and 540-560 nm versus the ...
      2021-06-12

    • Temperature dependent steric hindrance effects in triplet state relaxation of meso-phenyl-substituted Pd-octaethylporphyrins 

      Gorski, A.; Knyukshto, V.; Zenkevich, E.; Starukhin, A.; Kijak, M.; Solarski, J.; Semeikin, A.; Lyubimova, T. (Elsevier, 2018)
      The analysis of spectral-kinetic results of transient absorption and phosphorescence experiments has been carried out in a wide temperature range (80-293K) for a series of Pd-octaethylporphyrin derivatives (PdOEP) with increasing number of bulky meso-phenyl substituents. In order to elucidate the influence of steric hindrance interactions, as well as porphyrin macrocycle non-planarity ...
      2018-09-14

    • Temporal energy transfer in single nanoassemblies "Quantum dot - dye molecule" 

      Zenkevich, E. I.; Gerlach, F.; Borczyskowski, C. von (РИВШ, 2017)
      Zenkevich, E. I. Temporal energy transfer in single nanoassemblies "Quantum dot - dye molecule" / E. I. Zenkevich, F. Gerlach, C. von Borczyskowski // Квантовая электроника: материалы XI Международной научно-технической конференции, Минск, 13—17 ноября 2017 года / редкол.: М. М. Кугейко (отв. ред.) [и др.]. – Минск : РИВШ, 2017. – С. 70-71.
      2021-07-19

    • The Eurasian Customs Union in transition 

      Wolffgang, Hans-Michael; Brovka, G. M.; Belozerov, I. (Australia and University of Munster, 2013)
      Wolffgang, Hans-Michael. The Eurasian Customs Union in transition / Hans-Michael Wolffgang, G. M. Brovka, I. Belozerov // World Customs Journal / ed.-in-chief David Widdowson. – 2013. – Vol. 7, № 2. – P. 93-103.
      2019-04-10