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71.
N. M. Sergeyev G. I. Avramenko V. A. Korenevsky Yu A. Ustynyuk 《Magnetic resonance in chemistry : MRC》1972,4(1):39-52
The PMR spectra of cyclopentadine endo-dimer, its 1y-acetoxy-derivative and the dimer of spiro-heptadiene have been thoroughly studied. The assignment is proved by the use of spindecoupling experiments and the INDOR-technique. The relative signs of several coupling constants were found and used for the assignment. General trends in the proton chemical shifts and coupling constants are discussed for the derivatives of the cyclopentadiene dimer and for the substituted cyclopentadiene dimers. 相似文献
72.
73.
Adsorption of decyl-, dodecyl-, and hexadecylpyridinium chlorides (DePC, DoPC, and CPC, respectively) from aqueous solutions on the surface of detonation nanodiamonds (NDs) and its effect on the aggregation stability of ND hydrosols are studied. Hydrophobic interactions, which are enhanced with the length of hydrocarbon chains in surfactant molecules, are found to play the main role in surfactant adsorption on the ND surface. DePC is almost not adsorbed on NDs, and its addition has no effect on both the size and ζ potential of nanoparticles. Adsorption of DoPC decreases the ζ potential of ND particles, thus causing their coagulation. Superequivalent adsorption of CPC results in sign reversal of the ζ potential of ND particles, thereby leading to alternation of the zones of aggregation stability and coagulation of the hydrosols with a rise in the concentration of this surfactant. 相似文献
74.
A method is proposed for the preparation of a conducting polyaniline-nylon 6 composite with controlled morphology of its surface. The method consists of the ammonium persulfate-induced oxidation polymerization of aniline in the presence of nylon 6. As has been established with the use of atomic force microscopy, spherical polyaniline particles are formed on the surface of nylon 6 and their sizes decrease with an increase in the duration of nylon 6 hydrothermal modification at 100° C. It is shown that a decline in polyaniline particle size in the polyaniline-nylon 6 composite enhances its reactivity with respect to KI. 相似文献
75.
Sergei Popov Rui Zhang Sergey Sergeyev Ari T. Friberg 《Central European Journal of Physics》2010,8(2):202-206
Bragg grating reflectors placed along microcavity facets can improve the efficiency of a polymer dye laser built with such
a microcavity. The impact of different reflector designs on the mode pattern and resonance frequencies of the microcavity
is numerically simulated and analyzed. This rigorous physical model is based on solving the Maxwell equations and includes
such material properties as absorption, dispersion, fluorescence and optical gain. In certain cases, an asymmetrical layout
of the reflectors can be more preferable than the pair of reflectors located on opposite sides of the microcavity as it is
implemented for typical design. 相似文献
76.
Lin Dong Sergei Popov Sergey Sergeyev Ari T. Friberg 《Central European Journal of Physics》2010,8(2):228-234
An improved approach for narrow-band wavelength selection in tunable lasers is described. To provide the tunability, a reconfigurable
diffractive optical element (DOE) based on a programmable spatial light modulator (PSLM) is applied. With a proper choice
of the phase transfer function of the PSLM, the device can be used as a dispersive intra-cavity component for precise tuning
within the lasing spectral band of a solid-state dye laser. The suggested design allows avoiding the mechanical movement of
any cavity components. The tunability performance and simulation are demonstrated using the Fourier optics method. 相似文献
77.
G. Angloher M. Altmann M. Bruckmayer C. Bucci S. Cooper C. Cozzini P. Di Stefano F. von Feilitzsch T. Frank D. Hauff Th. Jagemann J. Jochum R. Keeling H. Kraus J. Macallister F. Pröbst Y. Ramachers J. Schnagl W. Seidel I. Sergeyev M. Stark L. Stodolsky H. Wulandari 《Physics of Atomic Nuclei》2003,66(3):494-496
Results of the CRESST experiment at Gran Sasso using 262-g sapphire calorimeters with tungsten phase transition thermometers are presented. Calibration and analysis methods are described. Data taken in 2000 have been used to place limits on WIMP dark matter particles in the Galactic halo. The sapphire detectors are especially sensitive to low-mass WIMPs with spin-dependent interaction and improve on existing limits in this region. 相似文献
78.
Copolymers of various compositions have been synthesized via copolymerization of aniline with 3,4-ethylenedioxythiophene in the presence of a poly(4-styrenesulfonic acid) matrix, and a mechanism of copolymerization has been suggested. It has been shown that the synthesized copolymers are included in non-stoichiometric interpolyelectrolyte complexes with matrices stabilized by salt bonds and nonionic interactions. The copolymers of aniline and ethylenedioxythiophene possess electrical conductivity and can enter into redox and acid-base reactions. 相似文献
79.
Vladimir A. Grishagin Yaroslav D. Sergeyev Roman G. Strongin 《Journal of Global Optimization》1997,10(2):185-206
A class of parallel characteristical algorithms for global optimization ofone-dimensional multiextremal functions is introduced. General convergence andefficiency conditions for the algorithms of the class introduced areestablished. A generalization for the multidimensional case is considered.Examples of parallel characteristical algorithms and numerical experiments arepresented. 相似文献
80.
Yaroslav D. Sergeyev 《Mathematical Programming》1998,81(1):127-146
In this paper new global optimization algorithms are proposed for solving problems where the objective function is univariate and has Lipschitzean first derivatives. To solve this problem, smooth auxiliary functions, which are adaptively improved during the course of the search, are constructed. Three new algorithms are introduced: the first used the exact a priori known Lipschitz constant for derivatives; the second, when this constant is unknown, estimates it during the course of the search and finally, the last method uses neither the exact global Lipschitz constant nor its estimate but instead adaptively estimates the local Lipschitz constants in different sectors of the search region during the course of optimization. Convergence conditions of the methods are investigated from a general viewpoint and some numerical results are also given. © 1998 The Mathematical Programming Society, Inc. Published by Elsevier Science B.V. 相似文献