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排序方式: 共有61条查询结果,搜索用时 718 毫秒
1.
O. A. Veliev 《Mathematical Notes》2007,81(3-4):440-448
We obtain asymptotic formulas for non-self-adjoint operators generated by the Sturm-Liouville system and quasiperiodic boundary conditions. Using these asymptotic formulas, we obtain conditions on the potential for which the system of root vectors of the operator under consideration forms a Riesz basis. 相似文献
2.
Veliev M. G. Chalabieva A. Z. Shatirova M. I. Akperova E. G. 《Russian Journal of Organic Chemistry》2003,39(6):825-830
Diene condensation of cyclopentadiene with 2-substituted allylacetylenes occurs nonselectively at a double and triple bonds; therewith the dienophile activity grows in parallel with the electron-withdrawing properties of the substituent. Depending on electronic character of functional groups the reaction proceeds as neutral diene synthesis. The relative activity of cyclopentadiene and 1,3-cyclohexadiene in reactions with allylacetylenes is essentially governed by the different distance between the 1,4-reactive sites in these systems. 相似文献
3.
O. A. Veliev 《Mathematische Nachrichten》2008,281(9):1341-1350
In this article we obtain asymptotic formulas for eigenvalues and eigenfunctions of the self‐adjoint operator generated by a system of Sturm–Liouville equations with summable coefficients and quasiperiodic boundary conditions. Then using these asymptotic formulas, we find conditions on the potential for which the number of gaps in the spectrum of the Hill's operator with matrix potential is finite. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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O. A. Veliev 《Russian Journal of Mathematical Physics》2006,13(1):101-110
In the paper, we construct the spectral expansion for the differential operator generated in L
2(−∞, ∞) by an ordinary differential expression of arbitrary order with periodic complex-valued coefficients Lebesgue integrable
on bounded intervals.
Dedicated to the memory of B. M. Levitan 相似文献
6.
I. I. Aliev A. A. Farzaliev M. R. Bagieva I. G. Aliev R. S. Magammedragimova Dz. A. Veliev 《Russian Journal of Inorganic Chemistry》2011,56(3):459-462
Alloys in the As2S3-TlAs2S2Se2 section of the As2S3-As2Se3-TlS ternary system were studied and a phase diagram was constructed using physicochemical methods (differential thermal analysis,
microstructural analysis, X-ray powder diffraction, also microhardness and density measurements). The diagram in the As2S3-TlAs2S2Se2 section is a non-quasi-binary diagonal section of the As2S3-As2Se3-TlSe quasi-ternary system. It was found that all the alloys in the section under ordinary conditions are obtained in the
vitreous state. At low As2S3 concentrations in the section, solid solutions form up to 2.5 mol %, and at low TlAs2S2Se2 concentrations, their extent is 3 mol %. 相似文献
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M. G. Veliev A. Z. Chalabieva A. F. Mamedova 《Russian Journal of Organic Chemistry》2009,45(5):650-659
The diene condensation of primary vinylacetylene and allylacetylene alcohols, their esters and ethers with polychlorocyclopentadienes proceeded regioselectively at the double bond of the dienophile leading to the formation of the corresponding polychlorobicyclic adducts of the endo-configuration. Kinetic parameters were determined, quantum-chemical calculations of dienes and some dienophiles were performed. Polychlorobicyclic acetylene alcohols subjected to various chemical transformations, in particular, to oxidation and acetylene-allene rearrangement, formed new functional derivatives. 相似文献
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