The potential energy curves of atom pairs and transport properties of high-temperature vapors of Cu and Si and their mixtures with He, Ar, and Xe gases.

The potential energy curves (PECs) for the homonuclear He-He, Ar-Ar, Cu-Cu, and Si-Si dimers, as well as heteronuclear Cu-He, Cu-Ar, Cu-Xe, Si-He, Si-Ar, and Si-Xe dimers, are obtained in quantum Monte Carlo (QMC) calculations. It is shown that the QMC method provides the PECs with an accuracy comparable with that of the state-of-the-art coupled cluster singles and doubles with perturbative triples corrections [CCSD(T)] calculations. The QMC data are approximated by the Morse long range (MLR) and (12-6) Lennard-Jones (LJ) potentials.

Transport coefficients of isotopic mixtures of noble gases based on potentials.

The transport coefficients such as viscosity, thermal conductivity, diffusion and thermal diffusion of neon, argon, krypton, and xenon are computed for a wide range of temperatures taking into consideration their real isotopic compositions. A new concept of isotopic thermal diffusion factor is introduced and calculated. The Chapman-Enskog method based on the 10th order approximation with respect to the Sonine polynomial expansion is applied.

Evaluating the potential of superhydrophobic nanoporous alumina membranes for direct contact membrane distillation.

Hypothesis: Direct contact membrane distillation (DCMD) processes exploit water-repellant membranes to desalt warm seawaters by allowing only water vapor to transport across. While perfluorinated membranes/coatings are routinely used for DCMD, their vulnerability to abrasion, heat, and harsh chemicals necessitates alternatives, such as ceramics. Herein, we systematically assess the potential of ceramic membranes consisting of anodized aluminum oxide (AAO) for DCMD.

Transport coefficients of helium-neon mixtures at low density computed from ab initio potentials.

The viscosity, thermal conductivity, diffusion coefficient, and thermal diffusion factor of helium-neon mixtures at low density are calculated for a wide range of temperature and for various molar fractions. The Chapman-Enskog method is employed considering the 10th order of the Sonine polynomial expansion. Ab initio potentials for intermolecular interactions are used to calculate the omega-integrals.

Energy accommodation coefficient extracted from acoustic resonator experiments.

We review values of the temperature jump coefficient determined from measurements of the acoustic resonance frequencies of helium-filled and argon-filled, spherical cavities near ambient temperature. We combine these values of with literature data for tangential momentum accommodation coefficient (TMAC) and the Cercignani-Lampis model of the gas-surface interaction to obtain measurement-derived values of the normal energy accommodation coefficient (NEAC). We found that NEAC ranges from 0 to 0.

Transport coefficients of helium-argon mixture based on ab initio potential.

The viscosity, thermal conductivity, diffusion coefficient, and thermal diffusion factor of helium-argon mixtures are calculated for a wide range of temperature and for various mole fractions up to the 12th order of the Sonine polynomial expansion with an ab initio intermolecular potential. The calculated values for these transport coefficients are compared with other data available in the open literature. The comparison shows that the obtained transport coefficients of helium-argon mixture have the best accuracy for the moment.

Ab initio simulation of transport phenomena in rarefied gases.

Ab initio potentials are implemented into the direct simulation Monte Carlo (DSMC) method. Such an implementation allows us to model transport phenomena in rarefied gases without any fitting parameter of intermolecular collisions usually extracted from experimental data. Applying the method proposed by Sharipov and Strapasson [Phys.

Power-series expansion of the Boltzmann equation and reciprocal relations for nonlinear irreversible phenomena.

The Boltzmann equation subject to a general boundary condition is expanded in a power series with respect to a thermodynamic force disturbing a gaseous system. Recurrence relations between the terms of the expansion are obtained using the main properties of the collision integral and of the gas-surface interaction kernel. The reciprocal relation for nonlinear irreversible phenomena, i.

Numerical modeling of the sound propagation through a rarefied gas in a semi-infinite space on the basis of linearized kinetic equation.

The sound propagation through a rarefied gas is investigated on the basis of the linearized kinetic equation. A plate oscillating in the direction normal to its own plane is considered as a sound wave source. It is assumed a fully established oscillation so that the solution of the kinetic equation depends on time harmonically, while its dependence on the spatial coordinates is obtained numerically.

Onsager-Casimir reciprocal relations based on the Boltzmann equation and gas-surface interaction: single gas.

The approach to the nonequilibrium thermodynamics based on the Boltzmann equation and gas-surface interaction law proposed in previous papers [F. Sharipov, Physica A 203, 457 (1994); 209, 457 (1994)] is generalized considering kinetic coefficients, which are neither odd nor even with respect to time reversal. It is proved that the reciprocity of the gas-gas and gas-surface interactions is a necessary and sufficient condition to derive the symmetry of the Onsager matrix.

[Dynamics of free-radical oxidation processes in transplantable sarcoma-45 as indicator of tumor and body interaction].

Induced chemoluminescence was used for 30 days to measure lipids peroxidation in transplantable sarcoma-45 homogenates in 83 noninbred male rats. It was found that tumor/body interaction can be interpreted in terms of free-radical oxidation processes taking place in tumor tissue. In the middle of the experiment, the kinetics of chemoluminescence soared up which was accompanied by slight increase in tumor mass.

[Lipid peroxidation and tumor dimensions in stomach cancer].

The parameters of lipid peroxidation were examined in blood serum of 40 patients with stomach cancer by induced chemiluminescence (CL)--Republican Research Center of Oncology, Healthcare Ministry of Uzbekistan. The CL parameters were demonstrated to increase alongside with the growing tumor mass. The induced CL of blood serum characterizes the status of lipid peroxidation and is a direct reflection of the body's reaction to tumor growth.

Heat transfer in the Knudsen layer.

A concept of the surface heat conductivity determining a heat transfer in the Knudsen layer was introduced. It has the same order with respect to the Knudsen number as the bulk heat transfer and must be taken into account in practical calculations. Using the Onsager principle the coefficient of the surface heat conductivity was related to the thermal slip coefficient.

[Kinetics of free-radical oxidation of blood serum as an indicator of tumor effect on organism].

The experiments were made with 83 outbred male rats with transplanted sarcoma-45. The method of initiated chemiluminescence (CL) was used to measure the parameters of blood-serum lipid peroxidation in the animals. The index of free-radical blood-serum lipid peroxidation was shown to reflect in rats the tumor-body ratio.

[Peroxidation of serum lipids in patients with breast cancer].

Parameters of chemiluminescence of lipid peroxidation (LP), induced by hydrogen peroxide in the blood serum of oncology patients (n = 60), were examined in the process of their combined therapy. During the dynamic observations, complete correlations were found between the peculiarities of manifestations and of the clinical course of the tumor process, the level of free-radical LP and the antioxidants of blood serum. A comprehensive assessment of all mentioned indices can be used to monitor the efficiency of a conducted therapy.

Free molecular sound propagation.

The sound propagation through a gas in the free-molecular regime is studied on the basis of the linearized collisionless Boltzmann equation. The two principal quantities that characterize the sound propagation, namely the phase and amplitude of the perturbation, are determined by taking into account the influence of the receptor. It is shown that at a small distance between the source and the receptor the presence of the last changes qualitatively the sound characteristics.

Onsager-Casimir reciprocity relation for the gyrothermal effect with polyatomic gases.

On the basis of the linearized Boltzmann equation and the boundary condition for the distribution function, the Onsager-Casimir reciprocity relation is derived for polyatomic gases confined between two cylinders in the presence of a magnetic field. The cross effect, namely, the heat flux caused by the rotation of the inner cylinder is predicted. Because of the heat flux the cylinder can be heated or cooled depending on the direction of the magnetic field.

[Effect of adaptation to high-altitude conditions on the circadian rhythm of the epithelial mitotic activity in the convoluted kidney tubules in white rats].

It has been established in experiments on 280 white randombred male rats weighing 100-120 g that the lifting of the animals from the valley (820 m above the sea level) to the mountains (3379 m above the sea level) brings about within the first day marked suppression of the mitotic activity of the epithelium of involuted renal tubules. This activity increases beginning from the end of the first week, approaches the control value by the 30th day of adaptation and almost completely returns to normal by the 60th day of the animals' stay in the mountains. The circadian rhythms of the mitotic activity appeared undisturbed and was monophasic in nature.