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1.
Dr. A. N. Danilenko V. Yu. Vetrov A. P. Dmitrochenko A. L. Leontiev E. E. Braudo V. B. Tolstoguzov 《Molecular nutrition & food research》1992,36(2):105-111
Thermodynamic properties of aqueous solutions of both native and modified legumin of broad beans (Vicia faba L.) have been examined. A restricted trypsin-induced proteolysis was used to modify protein structure. Evaluation of protein affinity to ficoll in aqueous solutions showed that modified protein possessed higher hydrophilicity. Thermodynamic properties of diluted solutions were used to predict the phase behaviour in concentrated systems containing protein and ficoll. At specific concentrations of native legumin, the system can separate in two phases, whereas in the case of modified protein the single-phase behaviour of the system was predicted for any concentrations of both components. The experimental data obtained in concentrated systems confirmed predictions of thermodynamic analysis of diluted solutions. 相似文献
2.
Raman spectra of SWNTs suspended in aqueous solutions containing fragmented single-stranded DNA (SWNT:DNA), and films obtained from this suspension have been obtained. SEM study of the dried films indicated that the nanotubes tend to aggregate into bundles which results in the enhancement of the Raman intensity of the G− tangential band, and an upshift and broadening of the G+ band. The intensity of radial breathing modes of metallic SWNTs is higher in the SWNT:DNA films as compared to that of the SWNT:DNA solution. The Raman spectra of SWNT:PVP and SWNT:agaroza samples exhibit similar changes as the SWNT:DNA samples when films are cast from the corresponding solutions. Both films and the solution forms of SWNT:DNA yield luminescence spectra which indicates the presence of individual tubes or small bundles in the films. The luminescence bands of SWNT:DNA films are relatively wider and is attributed to the interaction of DNA with the nanotube surface in the solid state. 相似文献
3.
A three-parameter differential model of turbulence supplemented with a transport equation for turbulent heat flux is used to perform calculations of the boundary layer on a heat-insulated wall in a supersonic gas flow with a value of Prandtl number Pr ≤ 0.7. The dependences on the values of Prandtl, Reynolds, and Mach numbers and of intensity of injection are obtained for the recovery factor. 相似文献
4.
In this paper we study the unconfined potential steady flow through a porous media with semipermeable bottom. We propose a
model that leads to a free boundary-value-problem with complementarities conditions on the bottom. The shape of a part of
the domain boundary, called free boundary, is one of the unknown of the problem. The pressure of the flow as well as the flow
velocity on the another part of the boundary, that is a one way permeable bottom, are also unknowns and satisfy a complementarity
condition. We present the numerical implementation of the model based on an optimization approach. Performing a boundary-element
discretization we get a nonlinear mathematical programming problem with complementarities conditions. To solve it we use Herskovits’s
interior point algorithm. Numerical examples are presented. 相似文献
5.
V. N. Gorobei Yu. A. Kiselev O. S. Vitkovskii M. Yu. Leontiev 《Measurement Techniques》2012,54(11):1213-1218
The primary standard for the unit of pressure, the pascal, its constituent parts, ranges of application, and the results of
key comparisons are described. 相似文献
6.
José Herskovits Mario Tanaka Filho Anatoli Leontiev 《Optimization and Engineering》2013,14(3):381-394
This paper deals with bilevel programs with strictly convex lower level problems. We present the theoretical basis of a kind of necessary and sufficient optimality conditions that involve a single-level mathematical program satisfying the linear independence constraint qualification. These conditions are obtained by replacing the inner problem by their optimality conditions and relaxing their inequality constraints. An algorithm for the bilevel program, based on a well known technique for classical smooth constrained optimization, is also studied. The algorithm obtains a solution of this problem with an effort similar to that required by a classical well-behaved nonlinear constrained optimization problem. Several illustrative problems which include linear, quadratic and general nonlinear functions and constraints are solved, and very good results are obtained for all cases. 相似文献
7.
8.
Leontiev V. K. Yurovskaya M. A. Lebedev A. E. 《Chemical and Petroleum Engineering》2022,58(3-4):281-284
Chemical and Petroleum Engineering - Calculating equations enabling determination of suspension residence time in a settling centrifuge and of productivity of a centrifuge for transitional and... 相似文献
9.
Numerical simulation is performed of the thermal state of a block of rectangular microchannels for different options of heat supply and for a developing distribution of the velocity of liquid in channels and end chambers. Three-dimensional fields of temperature and heat fluxes are obtained both in the frame of the block and in the flow of heat-transfer agent. Calculations are performed for different ratios of the geometric dimensions of the channel and of the frame walls. Simultaneous analysis is made of the calculation results and experimental data on the cooling capacity of the microchannel system.__________Translated from Teplofizika Vysokikh Temperatur, Vol. 43, No. 4, 2005, pp. 580–593.Original Russian Text Copyright © 2005 by V. I. Artemov, A. I. Leontiev, and A. F. Polyakov. 相似文献
10.
The high energy-saving capacity of channels with transverse projections and the economic expediency of their extensive uses in industrial heat exchangers are confirmed. Models and methods of thermohydraulic calculation of discretely rough channels are analyzed. The problem of the effect of spacing between projections on the drag and heat-transfer coefficients of the channels is discussed in detail. The consequences of this effect are considered, such as the bistable mode of flow, self-induced oscillation, and resonance in the flow. Technical recommendations are given for design engineers. Problems for further investigations are formulated. 相似文献