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排序方式: 共有153条查询结果,搜索用时 15 毫秒
1.
Doklady Mathematics - In this paper, for the first time, we provide a quasi-polynomial time approximation scheme for the well-known capacitated vehicle routing problem formulated in metric spaces... 相似文献
2.
V. P. Nekhoroshev Yu. P. Turov A. V. Nekhorosheva V. D. Ogorodnikov K. N. Gaevoi 《Russian Journal of Applied Chemistry》2006,79(5):833-840
The composition and structure of low-molecular-weight products of thermal oxidative degradation of atactic polypropylene were studied. 相似文献
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4.
I. N. Ogorodnikov V. A. Pustovarov M. Kirm V. S. Cheremnykh 《Optics and Spectroscopy》2004,97(2):244-250
A complex investigation of the dynamics of electronic excitations in nonlinear optical crystals of ammonium dihydrophosphate NH4H2PO4 was performed using low-temperature vacuum UV luminescence spectroscopy with time resolution upon selective photoexcitation by synchrotron radiation. Data on the photoluminescence decay kinetics, time-resolved photoluminescence spectra (2–6.2 eV), and time-resolved photoluminescence excitation spectra (4–24 eV) were obtained for the first time for NH4H2PO4 crystals at 8 K. It is ascertained that the photoluminescence of NH4H2PO4 crystals in the vicinity of 4.7 eV has intrinsic character due to the radiative annihilation of self-trapped excitons. Possible channels of generation and decay of relaxed and unrelaxed electronic excitations in NH4H2PO4 crystals are discussed. 相似文献
5.
Russian Chemical Bulletin - 相似文献
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A. S. Razinkin I. I. Ogorodnikov A. N. Titov M. N. Kuznetsov 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(9):1048-1050
A 1T-TiSe2 surface is studied by means of scanning tunneling microscopy (SMT) and X-ray photoelectron diffraction (XPD). The diffraction patterns were modeled in the multiple electron scattering approximation using the EDAC code. Variants of the point and structural defects on the 1T-TiSe2 surface are considered. The experimental and theoretical XPD patterns are compared on the basis of a convergence analysis of their R factors. 相似文献
8.
This paper reports on the results of the experimental and theoretical investigations of thermally stimulated recombination processes in crystals of the lithium borates Li2B4O7 and LiB3O5. For both types of crystals, the measurements of thermally stimulated luminescence curves, spectra, and temperature dependences of the intensities of steady-state X-ray luminescence have been performed in a single experimental cycle. In the framework of a unified model for the Li2B4O7 and LiB3O5 crystals, the thermally stimulated recombination processes have been calculated and the obtained results have been interpreted talking into account all available experimental data. 相似文献
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10.
The kinetics of electron tunneling between electron and hole sites, stimulated by mobility of lithium cations in lithium gadolinium
orthoborate (Li6Gd(BO3)3) crystals has been studied. A mathematical model has been proposed to describe the kinetics in the wide time interval of
10−8–100 s after pulsed irradiation. The calculation results have been compared with experimental data on the decay kinetics of
transient optical absorption (TOA) in Li6Gd(BO3)3 crystals in the visible and UV spectral regions. The nature of radiation defects responsible for TOA is discussed, as well
as the dependence of the TOA kinetics on temperature, excitation power, and other experimental conditions. 相似文献