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21.
N. A. Voinov A. N. Nikolaev D. V. Tarovatyi A. V. Kustov 《Russian Journal of Applied Chemistry》2008,81(9):1686-1690
Generation of droplets on a surface of the water thin film at upflow and down flow is considered. Expressions for computation of splash type mass transfer were developed. 相似文献
22.
O.V. Voinov 《International Journal of Multiphase Flow》1996,22(6):1155-1166
Consideration is given to the nonlinear problem on a shape of boundary between two viscous liquids, of which one displaces the other one from a solid surface, the Reynolds number being rather low. An asymptotic theory of wetting dynamics is developed that is of the second order with respect to small capillary numbers and valid for any ratio of viscosity coefficients of the media. A formula describing the dynamic contact angle (i.e. the inclination angle of the tangent to the interface) as a function of a distance to the solid is derived. Limitations on the angles for which the second-order theory is valid are shown. If the phase 2 viscosity is zero, the asymptotic second-order theory is valid for angles below 128.7°. A theory applicability domain depends on the ratio of viscosity coefficients. The applicability domain is not limited if the viscosity coefficients differ by a factor of less than four. 相似文献
23.
An analytical model for calculating the internal flow in a drop is proposed. The model is checked by numerically solving the exact boundary-value problem for the Navier-Stokes equations.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 6, pp. 167–170, November–December, 1989. 相似文献
24.
O. V. Voinov 《Journal of Applied Mechanics and Technical Physics》1994,35(6):875-890
Deposited at All-Union Institute of Scientific and Technical Information (VINITI), No. 3197-V93, December 27, 1993. 相似文献
25.
Smirnov AI Ruuge A Reznikov VA Voinov MA Grigor'ev IA 《Journal of the American Chemical Society》2004,126(29):8872-8873
This communication describes the use of a methanethiosulfonate derivative of an imidazolidine nitroxide, methanethiosulfonic acid S-(1-oxyl-2,2,3,5,5-pentamethyl-imidazolidin-4-ylmethyl) ester, IMTSL, for site-directed pKa determination of peptides by electron paramagnetic resonance. This spin label is covalently attached to the thiol group of unique cysteines incorporated into peptide structures. The tertiary amine nitrogen N3 of the label readily participates in proton exchange reactions, which are monitored through changes in EPR spectra of nitroxide moiety. Using EPR at 95 GHz (W-band) isotropic magnetic parameters of this nitroxide, both Aiso and giso, were calibrated in solvents of different polarity and pH. Two different linear correlations between Aiso and giso for acidic and basic forms of IMTSL were observed, making it possible to differentiate effects of local polarity from N3 protonation on nitroxide EPR spectra. Titration of a synthetic P11 peptide fragment of the laminin B1 chain illustrates the utility of this method. 相似文献
26.
The spin-spin coupling constants 3
J
C,H between the hydrogen atom of the aldonitrone group and the carbon atom bound to the nitrogen atom of the N-oxide fragment were determined for a wide range of cyclic and acyclic aldonitrones. Based on comparison of these constants (trans-3
J
C,H (E isomer) > cis-3
J
C,H (Z isomer)), the Z configuration was assigned to acyclic nitrones. Coordination of organolithium compounds to the oxygen atom of the NO group was revealed by 13C NMR spectroscopy. This coordination is the necessary condition for the metallation of aldonitrones. The configuration of the nitrone group is responsible for the ability of the E form of acyclic aldonitrones to undergo CD3ONa-catalyzed isotope exchange of the methine proton in CD3OD and metallation with BusLi. 相似文献
27.
28.
N-[1-Hydroxyimino-2-methyl-1-(2-pyridyl)prop-2-yl]hydroxylamine, a new representative of the series of α-hydroxylamino oximes,
was synthesized. Based on this compounds, 3-imidazoline 3-oxide and 2-imidazoline 3-oxide derivatives, were obtained, and
some of their chemical properties were investigated.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 131–136, January, 1997. 相似文献
29.
W Wang Z Liu L Ma C Hao S Liu VG Voinov NI Kalinovskaya 《Rapid communications in mass spectrometry : RCM》1999,13(12):1189-1196
Electrospray ionization (ESI) combined with multiple-stage tandem mass spectrometry (MS(n)) was used to directly analyze the glycolipid mixture from bacteria Bacillus pumilus without preliminary separation. Full scan ESI-MS revealed the composition of picomole quantities of glycerolglycolipid species containing C(14)-C(19) fatty acids, some of which were monounsaturated. Two main components were identified from their molecular masses and fragmentation pathways. The fragmentation pathway of the known compound compared with the investigated compound verified the proposed structure as 1(3)-acyl-2-pentadecanoyl-3(1)-O-[beta-D-glucopyranosyl-(1-->6)-O-beta-D-glucopyranosyl]-sn-glycerols. A comparison of the multiple tandem mass spectra of the different alkali-metal cation adducts indicates that the intensity of fragments and the dissociation pathways are dependent on the alkali-metal type. The basic structures of glycerolglycolipids were reflected clearly from the fragmentation patterns of the sodium cations. The intense fragments of the sugar residue from the precursor ions were obtained from the lithiated adduct ions. ESI-MS(n) spectra of [M + K](+) ions did not provide as much fragmentation as [M + Na](+) and [M + Li](+) adducts, but their spectra allow the position of glycerol acylation to be determined. On the basis of MS(2) spectra of [M + K](+) ions, it was established that all components have a C(15:0) fatty acid at the sn-2 position of the glycerol backbone and C(14)-C(19) acids at the sn-1 position of the glycerol backbone. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
30.
A price model with variance and correlation coefficients as random processes is analyzed. Parametric analysis is realized by means of “direct” and “inverse” trade algorithms. Results of numerical experiments are obtained on a computer using an INVERT program. 相似文献