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21.
Y. M. Baryshnikov 《Discrete and Computational Geometry》1997,17(3):257-261
The interchangeable Goodman—Pollack-type random finite sets are characterized.
Received June 14, 1995, and in revised form October 16, 1995. 相似文献
22.
Yu. M. Baryshnikov 《Functional Analysis and Its Applications》1990,24(3):220-221
Control Problems Institute. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 24, No. 3, pp. 62–63, July–September, 1990. 相似文献
23.
It has been established that laser excitation of infrared radiation (2.9 μm) in oxide and fluoride crystals doped by Er3+ ions gives rise to excitation of concomitant luminescence in the visible region according to the two-step nonlinear mechanism. 相似文献
24.
25.
S. V. Baryshnikov A. S. Baryshnikov A. F. Baranov V. V. Maslov 《Physics of the Solid State》2008,50(7):1322-1325
The dielectric properties of Pb1 ? x Ge x Te(Ga) (x = 0.02, 0.03, 0.05) were studied in the temperature range 77–150 K at frequencies of 104–106 Hz. It is revealed that the ferroelectric phase transition temperature T c and the permittivity ? of Pb1 ? x Ge x Te(Ga) increase substantially with the Ge content. The temperature dependence of the permittivity of Pb1 ? x Ge x Te shows two peaks; the main peak is at the ferroelectric phase transition temperature T c , and an additional peak is at T 1 > T c . 相似文献
26.
S. V. Baryshnikov Cheng Tien E. V. Charnaya M. K. Lee D. Michel W. Böhlmann N. P. Andriyanova 《Physics of the Solid State》2008,50(7):1342-1346
This paper reports on the results of studies of small particles of the superionic conductor AgI embedded in MCM-41 and SBA-15 molecular sieves with different sizes of pores (channels). The studies are performed by the dielectric and nuclear magnetic resonance techniques. The temperature of the superionic phase transition is shown to increase monotonically with decreasing pore size. The enthalpy of activation of the ion motion in β-AgI in restricted geometry is determined. It is shown that introduction of AgI into pores does not noticeably affect its structure. 相似文献
27.
Baryshnikov S. V. Milinskii A. Yu. Charnaya E. V. Egorova I. V. 《Physics of the Solid State》2019,61(2):134-138
Physics of the Solid State - We present the results of studies of the dielectric properties of nanocomposites based on Al2O3 oxide films with a pore size of 330 and 60 nm with particles of an... 相似文献
28.
Bodil Lousen Dr. Stephan K. Pedersen Pernille Bols Kasper H. Hansen Michelle R. Pedersen Prof. Ole Hammerich Dr. Sergey Bondarchuk Prof. Boris Minaev Dr. Glib V. Baryshnikov Prof. Hans Ågren Prof. Michael Pittelkow 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(22):4935-4940
This work describes a synthetic approach where a non-planar aromatic heterocyclic [7]helicene is compressed to yield a hetero[8]circulene containing an inner antiaromatic cyclooctatetraene (COT) core. This [8]circulene consists of four benzene rings and four heterocyclic rings, and it is the first heterocyclic [8]circulene containing three different heteroatoms. The synthetic pathway proceeds via a the flattened dehydro-hetero[7]helicene, which is partially a helicene and partially a circulene: it is non-planar and helically chiral as helicenes, and contains a COT motif like [8]circulenes. The antiaromaticity of the COT core is confirmed by nucleus independent chemical shift (NICS) calculations. The planarization from a helically π-conjugated [7]helicene to a fully planar heterocyclic [8]circulene significantly alters the spectroscopic properties of the molecules. Post-functionalization of the [7]helicenes and the [8]circulenes by oxygenation of the thiophene rings to the corresponding thiophene-sulfones allows an almost complete fluorescence emission coverage of the visible region of the optical spectrum (400–700 nm). 相似文献
29.
Mengkai Luo Dr. Xuping Li Longjiang Ding Dr. Gleb Baryshnikov Shen Shen Dr. Mingjie Zhu Dr. Lulu Zhou Dr. Man Zhang Prof. Dr. Jianjun Lu Prof. Dr. Hans Ågren Prof. Dr. Xu-dong Wang Prof. Dr. Liangliang Zhu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(39):17166-17173
The fact that the lifetime of photoluminescence is often difficult to access because of the weakness of the emission signals, seriously limits the possibility to gain local bioimaging information in time-resolved luminescence probing. We aim to provide a solution to this problem by creating a general photophysical strategy based on the use of molecular probes designed for single-luminophore dual thermally activated delayed fluorescence (TADF). The structural and conformational design makes the dual TADF strong in both diluted solution and in an aggregated state, thereby reducing sensitivity to oxygen quenching and enabling a unique dual-channel time-resolved imaging capability. As the two TADF signals show mutual complementarity during probing, a dual-channel means that lifetime mapping is established to reduce the time-resolved imaging distortion by 30–40 %. Consequently, the leading intracellular local imaging information is serialized and integrated, which allows comparison to any single time-resolved signal, and leads to a significant improvement of the probing capacity. 相似文献
30.
G. V. Baryshnikov V. A. Minaeva B. F. Minaev V.-H. Sun M. Grigoras 《Optics and Spectroscopy》2016,121(3):348-356
Two types of conjugated oligomers based on 4,4'-triphenylamine vinylene have been synthesized and characterized by the methods of IR, UV–visible, and 1H NMR spectroscopy. The corresponding spectra have also been simulated theoretically at the density functional theory level with application of the B3LYP and BMK hybrid exchange-correlation functionals. A comparative analysis of the experimental and theoretical spectra of polymers and oligomers has revealed regularities of the manifestation of spectral signals depending on the conjugation chain length and the presence of a substituent in the triphenylamine core. It has been established, in particular, that the absolute intensity of IR bands satisfies a linear dependence with increase in the degree of polymerization; however, no frequency shift is observed at the same time. The position of the main peak in electron absorption spectra demonstrates the bathochromic shift with an increase in the oligomeric chain length due to the narrowing of the energy gap between the boundary molecular orbitals. Based on the theoretical estimation of the hydrogen atoms chemical shifts, the signals of various protons types in the strongly broadened experimental 1H NMR spectra of the bis-(4-iodine phenyl)-phenylamine and N,N-bis-(4-iodine phenyl)-4'-(phenylethynyl)-phenylamine polymerization products have also been identified. 相似文献