Browsing Публикации в изданиях других стран by Title

Now showing items 90-109 of 1050

    • 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

    • 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

    • 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

    • NH-tautomerism and visible absorption spectra of porphyrins with nonsymmetrical substitution: oscillator model and mo calculations 

      Zenkevich, E. I.; Shulga, A. M.; Filatov, I. V.; Chernook, A. V.; Gurinovich, G. P. (1985)
      On the basis or experiments Ihe oscillator model has been established for individual NH tautomers or porphyrins with asymmetrical substitution. CNDO/2 calculations explain the inversion of Q ₓ (O.O) and Q y (O.O) electronic transition intensities in NH tautomers as a consequence of the inversion of LUMO coefficients c₁ and c₂ for fixed x and y molecular oscillators.
      2017-05-18

    • Nonlinear thermo-optical properties of two-layered spherical system of gold nanoparticle core and water vapor shell during initial stage of shell expansion 

      Pustovalov, V. K.; Astafyeva, L. G. (2011)
      Nonlinear thermo-optical properties of two-layered spherical system of gold nanoparticle core and water vapor shell, created under laser heating of nanoparticle in water, were theoretically investigated. Vapor shell expansion leads to decreasing up to one to two orders of magnitude in comparison with initial values of scattering and extinction of the radiation with wavelengths ...
      2018-03-06

    • On the bonding strength of Fe-based self-fluxing alloy coating deposited by different methods on the steel substrate 

      Feldshtein, E.; Kardapolava, M. A.; Dyachenko, O. V. (University of Zielona Góra, 2018)
      In the present paper, the bonding strength of Fe-based self-fluxing alloy coating deposited by plasma spraying, gluing and laser remelting and alloying on the steel substrate have been investigated. When flame melting, a globular structure is formed. Against the background of the solid solution carbide-boride phases are clearly distinguishable, between which the Fe-Fe2B and Fe-FeB ...
      2018-09-13

    • On the formation features and some material properties of the coating formed by laser cladding of a nicrbsi self-fluxing alloy 

      Devoino, O.; Feldshtein, E.; Kardapolava, M.; Lutsko, N. (Springer, 2018)
      In the present paper, the influence of laser cladding conditions on the powder flow conditions as well as the microstructure, phases, and microhardness of a Ni-based self-fluxing alloy coating is studied. The formation regularities of a coating microstructure with different cladding conditions as well as patterns of element distribution over the coating depth and in the transient ...
      2023-10-05

    • Operation of a Spark-Ignition Engine on Mixtures of Petrol and N-Butanol 

      Kukharonak, H.; Ivashko, V.; Pukalskas, S.; Rimkus, A.; Matijosius, J. (2017)
      The Article analyses the use of n-butanol (biobutanol) in mixtures with petrol in spark-ignition (SI) internal combustion engines (ICE). Analysis of the scientific literature allowed determining that n-butanol content had a different effect on the same engine parameters in different tests, thus a decision was made to conduct additional research, where, having assembled the necessary ...
      2018-03-10

    • Opportunities for bioenergy in the Baltic Sea Region 

      Silveira, S.; Khatiwada, D.; Leduc, S.; Kraxner, F.; Venkata, B. K.; Tilvikine, V.; Gaubyte, V.; Tauraite, E.; Romagnoli, F.; Blumberga, D.; Kundas, S. P.; Kalinichenko, A. S.; Peterson, K.; Utsar, K.; Vigants, E. (2017)
      Security of energy supply, promotion of the bio-economy, nutrient recycling, and innovation are prioritized policy areas in the EU Strategy for the Baltic Sea Region (EUBSR). The Baltic Sea Region (BSR) has a great bioenergy potential worth exploring in this context. This paper explores the state-of-art of bioenergy systems and synergies with eco-systems services in the BSR region ...
      2021-07-19

    • Passive mode locking of 2.09 μm Cr,Tm,Ho:Y3Sc2Al3O12laser using PbS quantum-dot-doped glass 

      Denisov, I. A.; Skoptsov, N. A.; Gaponenko, M. S.; Malyarevich, A. M.; Yumashev, K. V.; Lipovskii, A. A. (Optical Society of America, 2009)
      Passive Q-switched mode locking of a 2.09 μm flashlamp-pumped Cr3+,Tm3+,Ho3+:Y3Sc2Al3O12 laser by use of a phosphate glass doped with PbS quantum dots of 5 nm in radius was demonstrated. Mode-locked pulses of 290 ps in duration and up to 0.5 mJ in energy were registered.
      2012-01-23

    • Passive mode locking of a Tm,Ho:KY(WO4)2 laser around 2 μm 

      Lagatsky, A. A.; Fusari, F.; Calvez, S.; Gupta, J. A.; Kisel, V. E.; Kuleshov, N. V.; Brown, C. T. A.; Dawson, M. D.; Sibbett, W. (Optical Society of America, 2009)
      We report the first demonstration, to our knowledge, of passive mode locking in a Tm3+, Ho3+-codoped KY(WO4)2 laser operating in the 2000-2060 nm spectral region. An InGaAsSb-based quantum well semiconductor saturable absorber mirror is used for the initiation and stabilization of the ultrashort pulse generation. Pulses as short as 3.3 ps were generated at 2057 nm with average ...
      2012-01-23

    • Passive Q-switching of a Tm,Ho:KLu(WO4)2 microchip laser by a Cr:ZnS saturable absorber 

      Serres, Y. M.; Loiko, P. A.; Mateos, X.; Jambunathan, V.; Yasukevich, A. S.; Yumashev, K. V.; Petrov, V.; Griebner, U.; Aguilo, M.; Diaz, F. (Optical Society of America, 2016)
      A diode-pumped Tm;Ho:KLu WO42 microchip laser passively Q-switched with a Cr:ZnS saturable absorber generated an average output power of 131 mW at 2063.6 nm with a slope efficiency of 11% and a Q-switching conversion efficiency of 58%. The pulse characteristics were 14 ns∕9 μJ at a pulse repetition frequency of 14.5 kHz. With higher modulation depth of the saturable absorber, 9 ...
      2016-05-12

    • Passive Q-switching of Yb bulk lasers by a graphene saturable absorber 

      Loiko, P. A.; Serres, J. M.; Mateos, X.; Liu, G.; Zhang, H.; Yasukevich, A. S.; Yumashev, K. V.; Petrov, V.; Griebner, U.; Aguilo, M.; Diaz, F. (Springer, 2016)
      Compact Yb:KLu(WO4)2 and Yb:LuVO4 lasers diode-pumped at 978 nm are passively Q-switched by a single-layer graphene saturable absorber. The Yb:KLu(WO4)2 laser generated 165 ns/0.49 μJ pulses at 1030 nm with 170 mW average output power and 12 % slope efficiency. With the Yb:LuVO4 laser, 152 ns/0.83 μJ pulses were achieved. The output power reached 300 mW at 1024 nm, and the slope ...
      2016-05-11

    • Passively Q-Switched Thulium Microchip Laser 

      Gaponenko, M.; Kuleshov, N.; Südmeyer, T. (2016)
      We present the first passively Q-switched thulium microchip laser. The diode-pumped laser incorporates a Tm:KYW gain medium and an InGaAs semiconductor saturable absorber mirror. The laser emits pulses with a duration of 2.4 ns at a repetition rate of 1.2 MHz with an average output power of 130 mW at a wavelength of 1905 nm. It operates in a fundamental TEM00 mode with M2 < 1.1. ...
      2018-03-06