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排序方式: 共有106条查询结果,搜索用时 15 毫秒
1.
L. I. Zakharkin I. M. Churilova G. N. Antonova P. V. Petrovskii N. S. Ikonnikov 《Russian Chemical Bulletin》1994,43(8):1360-1362
Alkylation of cyclododecanone with ,-dibromoalkanes Br(CH)
n
Br (n=3, 4, 5) under conditions of phase-transfer catalysis in the presence of KOH results in the formation of either bicyclic ketones forn=3 and 5 or a mixture of bicyclic and spirocyclic ketones forn=4.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1436–1438, August, 1994. 相似文献
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A. B. Terent'ev T. T. Vasil'eva N. A. Kuz'mina E. I. Mysov N. S. Ikonnikov N. Yu. Kuznetsov Yu. N. Belokon 《Russian Chemical Bulletin》1999,48(6):1121-1127
Reformatsky-type addition of esters of α-halogeno carboxylic acids to aldehydes and ketones in the presence of Fe(CO)5 and an activating agent (CBrCl3 or I2) afforded the corresponding esters of β-hydroxy acids in good yields. Possible reaction mechanisms are discussed.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1132–1138, June, 1999. 相似文献
7.
本文利用荧光光谱和园二色光谱了新开花粉蛋白的盐酸胍去折叠过程。结果显示:新开花粉蛋白的盐酸胍去折叠是一个只包含天然蛋白和变性终态的二态过程,与已经报道的天花粉蛋白的盐酸胍去折叠的过程不同。 相似文献
8.
L.S. Bovkun A.V. Ikonnikov V.Ya. Aleshkin K.V. Maremyanin N.N. Mikhailov S.A. Dvoretskii S.S. Krishtopenko F. Teppe B.A. Piot M. Potemski M. Orlita V.I. Gavrilenko 《Opto-Electronics Review》2019,27(2):213-218
Magnetoabsorption in far and mid IR ranges in double HgTe/CdHgTe quantum wells with inverted band structure has been studied in high magnetic fields up to 30 T. Numerous intraband and interband transitions have been revealed in the spectra and interpreted within axial 8 × 8 k·p model. Splitting of dominant magnetoabsorption lines resulting from optical transitions from hole-like zero-mode Landau level has been discovered and discussed in terms of a built-in electric field and collective phenomena. 相似文献
9.
Kotereva T. V. Ikonnikov V. B. Gavrishchuk E. M. Potapov A. M. Savin D. V. 《Technical Physics》2018,63(7):1079-1083
A technique for precision rapid nondestructive monitoring of the dopant behavior in zinc chalcogenide–based laser media is reported. Results suggest that it is possible to determine the concentration profiles of Fe2+ and Cr2+ dopant ions in zinc chalcogenide by IR spectroscopy combined with an IR microscope in the concentration rage 5 × 1017–2.5 × 1020 atoms/cm3 with a spatial resolution of several micrometers. The diffusion profiles of dopants have been taken for zinc chalcogenide codoped by several impurities.
相似文献10.
K. N. Firsov E. M. Gavrishchuk V. B. Ikonnikov S. Yu. Kazantsev I. G. Kononov T. V. Kotereva D. V. Savin N. A. Timofeeva 《Physics of Wave Phenomena》2018,26(1):41-46
A method is developed for producing active laser elements (spectrum range 4 to 5 μm) based on polycrystalline solid solutions ZnSxSex-1 doped with iron ions. Bilateral diffusion doping of the elements by Fe2+ ions is performed during hot isostatic pressing. Spectral and energy characteristics of the laser are investigated with the Fe2+:ZnS0.1Se0.9 active element kept at room temperature. It is found that the absorption band of the Fe2+:ZnS0.1Se0.9 crystal is blueshifted with respect to the Fe2+:ZnSe absorption band, while the lasing spectra of the Fe2+:ZnSe and Fe2+:ZnS0.1Se0.9 lasers and their energy parameters are almost identical. The lasing energy of 580 mJ is obtained at the slope efficiency with respect to the absorbed energy of 46%. Further increase in the lasing energy is limited by development of transversal parasitic oscillation at a large size of the pump beam spot. 相似文献