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排序方式: 共有113条查询结果,搜索用时 15 毫秒
1.
V. N. Odinoko V. R. Akhmetova R. G. Savchenko A. A. Fatykhov A. Ya. Zapevalov 《Russian Chemical Bulletin》1994,43(6):1084-1085
Perfluoro-1-octene was used as a model for developing a method for the preparative ozonolysis of perfluoro-1-alkenes to the corresponding perfluoro-nor-alkenals. Perfluoroheptanal was synthesized.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1146–1147, June, 1994. 相似文献
2.
Proskurina V. E. Akhmetova L. A. Myagchenkov V. A. 《Russian Journal of Applied Chemistry》2003,76(4):610-615
The kinetics of flocculation of bentonitic clay suspensions and thickening of the sediments was studied in the modes of free and hindered sedimentation as influenced by pH of the medium, chemical nature and concentration of surfactants, and molecular properties of cationic flocculants, random copolymers of acrylamide with dimethylaminoethyl methacrylate hydrochloride. 相似文献
3.
R. I. Dzhalmakhanbetova S. B. Akhmetova V. A. Raldugin Yu. V. Gatilov G. A. Atazhanova S. M. Adekenov 《Chemistry of Natural Compounds》2006,42(3):307-309
A tetrabromo derivative of arglabin was synthesized stereoselectively. The molecular structure of the new compound was established
using PMR and 13C NMR spectra and an x-ray structure analysis. Its antifungal activity was demonstrated.
__________
Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 253–254, May–June, 2006. 相似文献
4.
Vnira R. Akhmetova Guzel R. Nadyrgulova Tat'yana V. Tyumkina Mikhail Yu. Antipin Usein M. Dzhemilev 《Tetrahedron》2007,63(47):11702-11709
Cyclocondensation of aliphatic diamines with CH2O and H2S (1:3:2 ratio, 0 °C) was carried out to give thiadiazabicyclanes and dithiadiazabicyclanes (1:6:4 ratio), which were previously difficult to synthesize. Symmetric α,ω-bis-1,3,5-dithiazinanes were synthesized at 80 °C by this reaction. The stereochemistry of thiadiazabicyclanes was assigned by 1H and 13C NMR spectroscopy and by theoretical DFT calculations, and of bis-dithiazinanes by X-ray diffraction study in the solid state. 相似文献
5.
O. V. Tatarnikov G. V. Malysheva E. Sh. Akhmetova B. B. Morozov 《Polymer Science Series D》2016,9(1):13-16
Results of finite-element modeling and experimental measurements of temperatures in the course of autoclave hardening of a three-layer panel of the wing of a T-50 aircraft, which is composed of upper and lower load-bearing panels made of carbon plastics and honeycomb from aluminum foil, are given. It is shown that the actual temperature values at various sections of the panel of wing differ from the theoretical ones by less than 90%. 相似文献
6.
A. I. Filippov P. N. Mikhailov O. V. Akhmetova M. A. Goryunova 《Journal of Applied Mechanics and Technical Physics》2010,51(3):369-376
The temperature field in a well is constructed on the basis of an on-the-average exact solution, which allows investigation
of problems of subterranean thermodynamics and heat and mass transfer. The problem is represented in the form of a sequence
of problems of a mixed type, whose solutions give corresponding asymptotic-expansion coefficients and the form of the remainder
term and the functions taking into account the presence of the boundary layer, for which analytical solutions are also found.
It is shown that the proposed modified asymptotic method provides vanishing of the solution of the averaged problem for the
remainder term. 相似文献
7.
8.
S. L. Oshchepkov T. V. Lapenok S. Kh. Akhmetova 《Journal of Applied Spectroscopy》1988,49(6):1302-1306
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 49, No. 6, pp. 990–994, December, 1988. 相似文献
9.
G. L. Sharipov V. R. Akhmetova I. V. Rusakov A. M. Abdrakhmanov L. R. Zagretdinova R. A. Sadykov Yu. A. Lebedev 《Russian Chemical Bulletin》2010,59(5):917-921
The effect of saturation with argon, as well as styrene and iodine additives on the temperature dependence of multibubble
sonoluminescence intensity in molten sulfur at 120–230 °C was studied. The shape of the temperature dependence with a maximum
at 170–200 °C is determined by the viscosity variations related to the changes in the molecular structure of molten elemental
sulfur. At high temperatures, cyclooctasulfane (S8) molecules break to radical products, which then undergo polymerization that can be slowed down by the additives. Sulfurization
of styrene during sonolysis of a sulfur—styrene mixture resulting in products of the thiophene series was detected. Unlike
thermal sulfurization that affords 2,5-diphenylthiophene as a major product, sonochemical sulfurization results mainly in
2,4-diphenylthiophene. The mechanism of 2,4-diphenylthiophene formation initiated by the reaction of styrene molecules with
S+ ions produced upon fragmentation of S8 within cavitation bubbles is proposed. The glow of electronically excited S+* ions is responsible for the band with a maximum at 560 nm in the sonoluminescence spectrum of molten sulfur, which is suppressed
by the styrene additive. 相似文献
10.
S. R. Khafizova V. R. Akhmetova T. V. Tyumkina L. M. Khalilov R. V. Kunakova U. M. Dzhemilev 《Russian Chemical Bulletin》2004,53(8):1717-1721
Multicomponent heterocyclization of hydrazine, hydrogen sulfide, and formaldehyde gave previously unknown bi-, tri-, and tetracyclic nitrogen- and sulfur-containing heterocycles. 3,7-Dithia-1,5-diazabicyclo[3.3.0]octane, 4,9-dithia-1,2,6,7-tetraazatricyclo[5.3.1.12,6]dodecane, and 4,9,14-trithia-1,2,6,7,11,12-hexaazatetracyclo[10.3.1.12,6.17,11]octadecane were obtained selectively, depending on the reaction temperature (0–60 °C).Published in Russian in Izvestiya Akademii Nauk.
Seriya Khimicheskaya, No. 8, pp. 1652–1656, August, 2004. 相似文献