Browsing Публикации ученых БНТУ by Issue Date

Now showing items 1-20 of 2483

  • "Остаточное" рекламное бюджетирование 

    Глубокий, С. В. (212)
    Одна из самых серьезных проблем, периодически возникающих у экономистов, - планирование, формирование и оценка эффективности рекламного бюджета
    2014-07-30

  • Concentration effects in pigment solutions 

    Gurinovich, G. P.; Losev, A. P.; Zenkevich, E. I. (1978)
    Gurinovich, G. P. Concentration effects in pigment solutions / G.P. Gurinovich, A.P. Losev, E.I. Zenkevich // Spectroscopy Letters. – 1978. - Vol 11, No 7. – P. 493-511.
    2017-05-18

  • Regularities of intermolecular interactions and energy transfer in mixed associates of chlorophyll and its analogs 

    Zenkevich, E. I.; Losev, A.P.; Kochubeev, G. A.; Gurinovich, G. P. (Elsevier Scientific Publishing Company, 1978)
    Regularities of intermolecular interactions and energy transfer in mixed associates of chlorophyll and its analogs / E.I. Zenkevich, A.P. Losev, G.A. Kochubeev, G.P. Gurinovich // Journal of Molecular Structure. – 1978. Vol. 45. – P. 423-436.
    2017-05-18

  • 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

  • Radiationless intermolecular energy transfer with participation of acceptor excited triplet states 

    Gurinovich, G. P.; Zenkevich, E. I.; Sagun, E. I. (1982)
    Radiationless energy transfer between like and unlike molecules has been experimentally studied under conditions where acceptor molecules have been excited to the triplet state. Homogeneous singlet—triplet—triplet migration has been discovered in higbly concentrated chlorophyll “a” and pheophytin “a” solutions in castor oil at 183 K by measuring the variation of pigment relative ...
    2017-05-18

  • Spectral Рeculiarities of NH-Tautomerism in Isocycle-Containing Porphyrins and their Covalently Linked Dimers 

    Zenkevich, E. I.; Shulga, A. M.; Chernook, A. V.; Gurinovich, G. P. (1984)
    It has been found experimentally that a whole class of isocycle-containing porphyrins, including synthetic and natural objects and their covalently linked dimers, shows NH-tautomerism which manifests itself in isotropic solutions in normal electronic spectra both at 77 K and higher temperatures (up to 500 K).
    2017-05-18

  • Метод расчета интенсивности линий и изменения геометрии молекулы при резонансном комбинационном рассеянии 

    Трифонов, Н. Ю. (Наука и техника, 1984)
    Аналитически получены формулы для вычисления безразмерных сдвигов равновесных межъядерных расстояний и интенсивностей высших возбуждений и составных частот в спектрах резонансного комбинационного рассеяния с учетом точного суммирования по всем промежуточным колебательным уровням возбужденного электронного состояния. В качестве примера рассчитывался спектр раствора [(C2H5)4N][FeCl4] ...
    2013-08-07

  • NH-Tautomerism and Visible Absorption Spectra of Porphyrins with Nonsymmetrical substitution 

    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

  • Плотность состояний на поверхности твердого тела с примесью замещения 

    Трифонов, Н. Ю. (Наука и техника, 1985)
    Аналитически вычислена плотность одночастичных состояний в примесной зоне случайно распределенных адатомов в узлах некоторой двумерной решетки.
    2013-08-07

  • Долговечность центрифугированных железобетонных стоек 

    Леонович, С. Н. (Информэнерго, 1991)
    Обзор посвящен актуальной проблеме повышения долговечности конструкций кольцевого сечения из бетона центробежного формования для широкого внедрения эффективных центрифугированных железобетонных конструкций при электросетевом строительстве в суровых климатических условиях. Представлен материал многолетних исследований и работ по центрифугированным железобетонным стойкам, ...
    2014-05-24

  • Resonance Raman spectra interpretation by molecular coherent state representation 

    Trifonov, N. Yu. (1992)
    In this paper the problem of exact summation over vibrational states of intermediate electronic level excited by resonance Raman scattering in a molecular system with an arbitrary number of vibrational modes is solved with the help of the coherent state representation. For matrix elements of the resonance Raman (RR) amplitude the expressions in the form of an integral and multiple ...
    2014-03-28

  • Проблема точечной полноты в теории управления дифференциально-разностными системами 

    Метельский, А. В. (1994)
    Проблема точечной полноты в теории управления дифференциально-разностными системами / А.В. Метельский // Успехи математических наук. –1994. – Т.49, Вып.2. – С.104-140.
    2014-02-05

  • 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

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

    Zenkevich, E. I.; Shulga, A. M.; Chernook, A. V.; Rempel, U.; von Borczyskowski, C. (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

  • Задача идентификации в факторизованном пространстве состояний для дифференциально-разностной системы с соизмеримыми запаздываниями 

    Метельский, А. В. (1995)
    Задача идентификации в факторизованном пространстве состояний для дифференциально-разностной системы с соизмеримыми запаздываниями / А.В. Метельский // Дифференциальные уравнения. – 1995. – Т.31, №8. – С.1353-1360.
    2014-02-05

  • О построении успокаивающих управлений для дифференциально-разностных систем с соизмеримыми запаздываниями 

    Метельский, А. В. (1995)
    О построении успокаивающих управлений для дифференциально-разностных систем с соизмеримыми запаздываниями / А.В. Метельский // Дифференциальные уравнения. – 1995. – Т.31, №12. – С.1989-1995.
    2014-02-05

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

    Chernook, A. V.; Rempel, U.; von Borczyskowski, C.; 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

  • Photophysical and photochemical properties of potential porphyrin and chlorin photosensitizers for PDT 

    Zenkevich, E.; Sagun, E.; Knyukshto, V.; Shulga, A.; Mironov, A.; Efremova, O.; Bonnett, R.; Pinda Songca, S.; Kassem, M. (1996)
    Structural and optical properties as well as photophysical and photochemical parameters (excited S₁ and T₁ state lifetimes at 77 K and in the presence of O₂ in solution at 293 K; efficiencies of singlet oxygen, ¹Δg, generation) are presented for porphyrins and chlorins with potential for the PDT of cancer: chlorin p₆ and its trimethyl ester, chlorin e₆ and its Na₃ and K₃ salts, ...
    2017-05-25

  • 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

  • Complexation and interchromophoric interactions in self-organized porphyrin and chlorin triads 

    Chernook, A. V.; Shulga, A. M.; Zenkevich, E. I.; Rempel, U.; von Borczyskowski, C. (1996)
    Spectral properties and equilibrium constants of multimolecular complexes (triads) formed by 2-fold coordination of dipyridyl-substituted free bases of porphyrin, chlorin, or tetrahydroporphyrin with Zn-porphyrin and Zn-chlorin dimers bridged by either of two different spacers between the monomeric entities have been studied in methylcyclohexane at room temperature. The ability ...
    2017-05-18