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Wyszukujesz frazę "Yakovlev, G." wg kryterium: Autor

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    Wyświetlanie 1-11 z 11
    Tytuł:
    Modification of cement matrixes with dispersion of multilayer carbon nanotubes
    Modifikacija cementhykh matric dispersiejj mnogoslojjnykh uglerodnykh nanotrybok
    Autorzy:
    Yakovlev, G.
    Pervushin, G.
    Fedorova, G.
    Maeva, I.
    Pudov, I.
    Korzhenko, A.
    Keriene, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/793569.pdf
    Data publikacji:
    2012
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    carbon nanotube
    dispersion
    calcium hydrosilicate
    frost resistance
    compact structure
    Portland cement
    cement stone
    microstructure
    thermal analysis
    cement matrix
    Opis:
    The concrete with compact structure on the basis of Portland cement modified by the dispersion of multilayer carbon nanotubes GraphistrengthTM by Arkema is investigated. The change in the structure of cement stone in the process of concrete setting and hardening when introducing carbon nanotubes into the concrete composition is observed.
    Исследован бетон плотной структуры на основе портландцемента, модифицированный дисперсией многослойных углеродных нанотрубок GraphistrengthTM, производимых корпорацией «Аркема». Установлено изменение структуры цементного камня в процессе гидратации и твердения при введении углеродных нанотрубок в состав бетона.
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 3
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Magnetic Polaron Formation on the Exciton Mobility Edge in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te
    Autorzy:
    Mackh, G.
    Yakovlev, D. R.
    Ossau, W.
    Waag, A.
    Landwehr, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932095.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    Opis:
    We study the exciton localization in the semimagnetic semiconductor Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te by selective excitation of the exciton photoluminescence. We show that the energy position of the effective mobility edge for excitons is subject to the competition between nonmagnetic and magnetic localization due to the magnetic polaron formation. External magnetic fields affect this competition by suppressing the polaron formation, which shifts the mobility edge.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 265-268
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescent Probe for Highly Energetic Collisions in Mixtures of Complex Molecules with Acceptors of Vibrational and Triplet Energy
    Autorzy:
    Zalesskaya, G. A.
    Yakovlev, D. L.
    Sambor, E. G.
    Baranovsky, D. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008324.pdf
    Data publikacji:
    1999-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.50.+w
    34.50.Ez
    34.90.+q
    Opis:
    Pressure dependences of intensities and decay rates of time-resolved luminescence of acetophenone, benzophenone, anthraquinone were used to obtain the efficiencies of vibrational and triplet-triplet energy transfer. It was shown that vibrational relaxation of the chosen molecules can be interpreted in terms of two consecutive processes: rapid collisional relaxation of molecules from initially prepared states to a vibrational distribution at T$\text{}_{vib}$ by vibration-vibration process and relaxation of this vibrational distribution to the thermal one (vibration-translation process). At relatively small internal energy < 10000 cm$\text{}^{-1}$, the collisional efficiencies of the vibration-vibration process in mixtures with polyatomic bath gases had values typical of processes with a supercollision contribution. Molecules relaxed from the upper vibrational level to the vibrational distribution after several collisions (2-3). The average energies transferred per collision are well correlated with predictions of the simple ergodic theory of collisional energy transfer. The majority of the collisions took part only in vibration-translation energy transfer of relatively small energies. The efficiencies of triplet-triplet energy transfer were analyzed for acetophenone, benzophenone and anthraquinone as donors and biacetyl-acceptor in a gas phase when energy of about 20000 cm$\text{}^{-1}$ was transferred. It permitted us to elucidate the common features of highly energetic collisions. It was shown that the efficiencies are much lower than the gas kinetic ones and depended on the vibrational energy and temperature. It was discussed how to enhance triplet-triplet efficiencies due to vibrational excitation of a donor molecule.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 6; 897-910
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Magnetic Polaron Features in Photoluminescence Excitation Spectra of CdTe/(CdMn)Te Quantum Wells with High Mn Contents
    Autorzy:
    Mackh, G.
    Ossau, W.
    Yakovlev, D. R.
    Landwehr, G.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933923.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.+z
    78.55.Et
    Opis:
    Exciton magnetic polarons are studied in CdTe/Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (0.4 ≤ x ≤ 0.8) quantum wells. The magnetic polaron formation leads to the appearance of an additional line in the photoluminescence excitation spectra, which can be employed to determine the Zeeman splittings more exactly than by using the free exciton peak. We find an overall increase in the polaron energy with increasing x in the whole range of Mn contents studied.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 849-852
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel CdTe/CdMgTe Graded Quantum Well Structures
    Autorzy:
    Wojtowicz, T.
    Kutrowski, M.
    Karczewski, G.
    Cywiński, G.
    Surma, M.
    Kossut, J.
    Yakovlev, D. R.
    Ossau, W.
    Landwehr, G.
    Kochereshko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968448.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    78.55.Et
    Opis:
    We report on growth and magnetooptical studies of two types of novel CdTe/CdMgTe quantum well structures having a precisely controlled grading of either the quantum well width or the donor concentration in a direction perpendicular to the growth axis. The presence of two-dimensional electron gas of varying concentration produced by the graded modulation doping was evidenced by observation of negatively charged exciton-electron complexes (X¯).
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1063-1066
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Spin-Glass Transition in Semimagnetic Quantum Wells Based on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te by Means of Optical Spectroscopy
    Autorzy:
    Zehnder, U.
    Yakovlev, D. R.
    Ossau, W.
    Waag, A.
    Landwehr, G.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968455.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    78.55.Et
    Opis:
    The spin-glass transition in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te epitaxial layers and bulk samples with 0.24 ≤ x ≤ 0.43 and in quantum well structures on the basis of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te were investigated by means of optical spectroscopy. Reduction of dimensionality of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te layers down to the quasi-two-dimensional case realized in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te/Cd$\text{}_{1- y}$Mn$\text{}_{y}$Te heterostructures frustrates the spin-glass formation, which is in agreement with theoretical predictions. The spin-glass formation is also frustrated in the vicinity of interfaces between semimagnetic and nonmagnetic semiconductors in CdTe/Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te quantum wells.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1075-1078
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model Study of Inhomogeneous Line Broadening in Excitonic Spectra of Quantum Wells
    Autorzy:
    Astakhov, G. V.
    Kochereshko, V. P.
    Kosobukin, V. A.
    Yakovlev, D. R.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Ossau, W.
    Landwehr, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969005.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ci
    78.66.-w
    Opis:
    An approach is proposed to estimate separately parameters of homogeneous and inhomogeneous broadenings from an optical reflection line of a quasi-2D exciton. A phenomenological model is proposed to take into account statistically an inhomogeneous broadening of the exciton resonant spectra. The concept is applied to study a modulation-doped heterostructures with a single quantum well CdTe/CdMgTe. From exciton reflection lines taken in a magnetic field the temperature-dependent homogeneous and inhomogeneous broadening parameters as well as the exciton radiative decay rate are measured.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 235-239
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optically Detected Magnetic Resonance of Excess Electrons in CdTe/(Cd,Mg)Te Quantum Wells
    Autorzy:
    Hu, C. Y.
    Ossau, W.
    Yakovlev, D. R.
    König, B.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969094.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.70.Hb
    71.35.-y
    71.35.Ji
    Opis:
    The spin resonance of excess electrons is observed with the detection either on the neutral or the negatively charged exciton X$\text{}^{-}$ emission in type I CdTe/(Cd,Mg)Te quantum wells with excess electrons of low density. It is found that the electron spin-dependent and electron spin-conserving formation and recombination of X$\text{}^{-}$ make the optical detection of the spin resonance of excess electrons feasible. For the first time, optically detected magnetic resonance is used to study fast optical transition processes in the nanosecond timescale where the microwave-induced magnetic transition rate is much lower than the optical transition rate.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 351-354
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Anisotropy of ZnSe/BeTe Superlattices Probed by Excitonic Spectroscopy
    Autorzy:
    Platonov, A. V.
    Kochereshko, V. P.
    Ivchenko, E. L.
    Yakovlev, D.
    Ossau, W.
    Fischer, F.
    Waag, A.
    Landwehr, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992063.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.66.-w
    78.66.Hf
    Opis:
    Photoluminescence spectra of type-II ZnSe/BeTe superlattices were studied. A linear polarised photoluminescence has been found in the spectral range of spatially indirect exciton transitions. This observation is interpreted in a model of optical anisotropy of heterostructures with no-common atom at interfaces.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 479-482
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton States in Type-II ZnSe/BeTe Quantum Wells
    Autorzy:
    Platonov, A. V.
    Yakovlev, D. R.
    Zehnder, U.
    Kochereshko, V. P.
    Ossau, W.
    Fischer, F.
    Litz, Th.
    Waag, A.
    Landwehr, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968413.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ls
    78.66.Hf
    Opis:
    We present an optical investigation of novel heterostructures based on beryllium chalcogenides with a type-I and type-II band alignment. In the type-II quantum well structures (ZnSe/BeTe) we observed a strong exciton transition involving an electron confined in the conduction band well and a hole localized in the valence band barrier (both in ZnSe layer). This transition is drastically broadened by the temperature increase due to enhanced exciton-acoustic phonon interaction.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 953-957
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Exchange between Nearly-Free and Acceptor-Bound States of a Positive Trion Assisted by Cyclotron Excitation
    Autorzy:
    Jadczak, J.
    Bryja, L.
    Wójs, A.
    Bartsch, G.
    Yakovlev, D. R.
    Bayer, M.
    Plochocka, P.
    Potemski, M.
    Reuter, D.
    Wieck, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047925.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    71.35.Ji
    71.35.Pq
    78.20.Ls
    Opis:
    In magneto-photoluminescence spectra of a two-dimensional hole gas in a GaAs quantum well we observe coupling of two different radiative states. The pair of coupled states are an acceptor-bound trion AX$\text{}^{+}$ and an essentially free (only weakly localized by a shallow lateral potential) trion X$\text{}^{+}$, brought into resonance by an additional cyclotron excitation controlled by the magnetic field. The coupling mechanism is the exciton transfer, and the optical signature is a clear anticrossing of the emission lines of an X$\text{}^{+}$ and a cyclotron replica of the AX$\text{}^{+}$.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 600-601
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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