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排序方式: 共有79条查询结果,搜索用时 265 毫秒
1.
K.R. Allakhverdiev T. Baykara E. Günay A. Kulibekov E.Yu. Salaev 《Optics Communications》2006,261(1):60-64
The Bridgman method is used to grow single crystals of ε-GaSe. The two-photon absorption (TPA) coefficient β was measured for especially un-doped crystals at room temperature for the ordinary o-ray (β⊥) and extraordinary e-ray (β∥) using single-wavelength excitation by a Nd:YVO4 laser at 1.064 μm with a pulse duration of 10 ps and a repetition rate of 81 MHz. No large anisotropy was observed for the TPA coefficients between the two geometries. The TPA coefficients were found to be β⊥ = 1.07 × 10−9 cm/W and β∥ = 1.88 × 10−9 cm/W. It was found that doping slightly increases the TPA coefficient. The value of the TPA for crystals doped with 0.5 at.% of Tl is β⊥ = 7.56 × 10−9 cm/W. 相似文献
2.
A. M. Magerramov M. M. Kurbanova R. T. Abdinbekova I. A. Rzaeva V. M. Farzaliev M. A. Allakhverdiev 《Russian Journal of Applied Chemistry》2006,79(5):787-790
3,4-Dihydropyrimidinones (-thiones) were prepared by ternary condensation of various aromatic aldehydes with ethyl acetoacetate and urea (thiourea) in the presence of trichloroacetic acid in ethanol. 相似文献
3.
Allakhverdiev SI Feyziev YM Ahmed A Hayashi H Aliev JA Klimov VV Murata N Carpentier R 《Journal of photochemistry and photobiology. B, Biology》1996,34(2-3):149-157
The protective action of co-solutes, such as sucrose and glycinebetaine, against the thermal inactivation of photosystem II function was studied in untreated and Mn-depleted photosystem II preparations. It was shown that, in addition to the reactions that depend on the oxygen evolving activity of the photosystem, those that implicate more intimately the reaction center itself are protected by high concentrations of osmolytes. However, the temperature required to inhibit oxygen evolution totally in the presence of osmolytes is lower than that required to eliminate reactions, such as P680 (primary electron donor in photosystem II) photo-oxidation and pheophytin photo reduetion, which only involve charge separation and primary electron transport processes. The energy storage measured from the thermal dissipation yield during photoacoustic experiments and the yield of variable fluorescence are also protected to a significant degree (up to 30%) at temperatures at which oxygen evolution is totally inhibited. It is suggested that a cyclic electron transport reaction around photosystem II may be preserved under these conditions and may be responsible for the energy storage measured at relatively high temperatures. This interpretation is also supported by thermoluminescence data involving the recombination between reduced electron acceptors and oxidized electron donors at - 30 and - 55 °C. The data also imply that a high concentration of osmolyte allows the stabilization of the photosystem core complex together with the oxygen-evolving complex. The stabilization effect is understood in terms of the minimization of protein-water interactions as proposed by the theory of Arakawa and Timasheff (Biophys. J., 47 (1985) 411--414). 相似文献
4.
M. A. Allakhverdiev V. M. Farzaliev Ch. I. Mamedov 《Chemistry of Heterocyclic Compounds》1985,21(10):1080-1081
The reaction of p-xylene with epichlorohydrin in the presence of aluminum chloride gave 1,4-dimethyl-2,5-bis(1-chloro-2-hydroxypropyl)benzene, which serves as the starting compound for the synthesis of the corresponding symmetrical dithiirane.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1319–1321, October, 1985. 相似文献
5.
M. A. Allakhverdiev A. Z. Khalilova V. M. Farzaliev Yu. M. Sultanov 《Chemistry of Heterocyclic Compounds》1988,24(5):485-488
The reaction of phenyl- and p-tolylmagnesium bromides, as well as di, tri, and tetramethylbenzene, with epichlorohydrin was used to synthesize the corresponding chlorohydrins, which were then converted to various benzyl-substituted oxiranes and thiiranes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 598–602, May, 1988. 相似文献
6.
Conditions of synthesis of N-hydroxyethyl-substituted succinimide and phthalimide by reactions of dicarboxylic acid imides with aminoethanol were optimized.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 12, 2004, pp. 2059–2060.Original Russian Text Copyright © 2004 by Gasanov, Allakhverdiev. 相似文献
7.
K.R. Allakhverdiev M.A. Nizametdinova E.Yu. Salaev R.M. Sardarly N.Yu. Safarov E.A. Vinogradov G.N. Zhizhin 《Solid State Communications》1980,36(6):527-532
The lattice vibration spectra of TlS and TllnSe2 crystals were investigated by infrared reflectivity in the wavenumber range from 20 to 5000 cm?1. The frequencies of K = 0 phonons were determined by Kramers-Kronig analysis of the spectra. All five infrared active lattice vibrations predicted by the group theoretical analysis were identified. The normal coordinates of vibrations for five infrared active phonons were determined. In the approximation which does not take into consideration long range Coulomb interaction values of the force constant and effective changes are obtained for TlSe, TlS and TllnSe2 crystals. 相似文献
8.
A. T. Guseinova K. I. Alieva I. A. Rzaeva A. M. Magerramov I. A. Aliev V. M. Farzaliev M. A. Allakhverdiev 《Russian Journal of Applied Chemistry》2009,82(9):1587-1591
1-Amino-4-phenyl-2-butanethiols were synthesized and characterized and their antioxidant activity in auto-oxidation of cumene
and in their reaction with cumyl peroxide radicals and cumyl hydroperoxide was studied. 相似文献
9.
10.
Shitov AV Zharmukhamedov SK Shutova TV Allakhverdiev SI Samuelsson G Klimov VV 《Journal of photochemistry and photobiology. B, Biology》2011,104(1-2):366-371
The effects of suppression of the carbonic anhydrase (CA) activity by a CA-inhibitor, acetazolamide (AA), on the photosynthetic activities of photosystem II (PS II) particles from higher plants were investigated. AA along with CA-activity inhibits the PS II photosynthetic electron transfer and the AA-induced suppression is totally reversed by the addition of bicarbonate (3-5 mM). Similar effect of recovery in the PS II photosynthetic activity was also revealed upon the addition of known artificial electron donors (potassium ferrocyanide and TMPD). Significance and possible functions of CA for the PS II donor side are discussed. 相似文献