Matched heat transfer at nonisothermal walls with highly nonuniform properties

In this paper an approach to the solution of problems of matched heat transfer at inhomogeneous walls is formulated. Special attention is paid to the longitudinal heat flow effect in the inhomogeneous wall thickness and in the flow of liquid or gas bathing the wall.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 4, pp. 9–16, July–August, 1985.     

Plasma Pyrolysis of Ethanol for the Production of Carbon Nanostructures

High Energy Chemistry - An experimental and numerical study of the synthesis of carbon nanostructures by pyrolysis of alcohol in helium and nitrogen plasma jets generated by a DC plasma torch in...     

Effect of thermal motion of residual gas molecules on the degradation of the field emission cathode based on carbon nanotubes

The rate of degradation of carbon nanotubes in an electron field emission cathode is calculated taking into account thermal motion of the residual gas atoms. As the degradation mechanism, we consider the sputtering of the surface of carbon nanotubes by ions formed as a result of ionization of residual gas molecules by electron impacts. It is shown that the allowance for the initial thermal motion of atoms, the ionization of which is a source of ions, considerably reduces the degradation rate as compared to the results of approximate calculations based on the assumption of motionless atoms.     

Influence of Nanoseconds Pulsed Discharges on the Composition of Intermediate and Final Combustion Products in the HCCI Engine

Plasma Chemistry and Plasma Processing - The composition of combustion products depending on the method for the organisation of combustion in the HCCI engine (with and without a non-equilibrium...     

Growth kinetics and micromorphology of NH4Cl:Mn2+ crystals formed in the NH4Cl-MnCl2-H2O-CONH3 system

The growth kinetics and elementary growth processes on the surface of NH₄Cl:Mn²⁺ heterogeneous crystals formed in the NH₄Cl-MnCl₂-H₂O-CONH₃ system are experimentally studied. It is found that a change in the composition of complexes in an NH₄Cl crystal from Mn(NH₄)₂Cl₄ · 2H₂O to MnCl₂ · 2CONH₃ leads to the occurrence of a local maximum in the kinetic curve and a change in the shape of dislocation growth centers from flat to conical. The growth kinetics of {100} faces of heterogeneous NH₄Cl:Mn²⁺ crystals is described within the Bliznakov model using the Fowler-Guggenheim adsorption isotherm, which takes into account the lateral interaction of adsorbed particles.     

Two-parametric model of the spectrum of traffic noise in Tomsk

The technique of mapping urban noise is proposed on the basis of a two-parameter model of the acoustic noise spectrum. The acoustic noise and spatial distribution of the decay rate in Tomsk are mapped. The factors influencing the formation of the acoustic noise of traffic flow are described. Analysis is performed on how different operating modes of a vehicle??s internal combustion engine affect the background level of acoustic noise.     

Influence of the electric field on the alignment of carbon nanotubes during their growth and emission

The problems of the electric field action on carbon nanotubes (CNTs) during their growth and under the electron field emission conditions are considered. The relations determining the growth rate of an extended structure under the action of the electric field are established. The relation connecting the angle of orientation of a CNT inclined to the substrate surface and the applied electric field is used for computing current-voltage characteristics of the cathode consisting of inclined CNTs. The degree of deviation of these characteristics from the Fowler-Nordheim classic dependence is determined, on the one hand, by the parameters characterizing the CNT spread over the angles of inclination and, on the other hand, by the value of the Young modulus characterizing the bending stiffness of a nanotube. It is shown that in zero external electric field, a certain effect on the CNT orientation can be produced by the CNT potential relative to the substrate, which is due to the effect of the contact potential difference.     

Photochemical properties of photosystem 1 immobilized in a mesoporous semiconductor matrix

The pigment-protein complex of photosystem 1 (PS1) isolated from cyanobacterium Synechocystis sp. PCC 6803 has been adsorbed on a solid mesoporous film made from TiO₂ nanoparticles. was on The TiO₂ film supported on a glass substrate with a surface area of 1 cm² adsorbs up to 0.045 nmol of PS1. PS1 molecules are distributed in the pores of the mesoporous support. Immobilization has an insignificant effect on the optical and photochemical properties of PS1. A reversible photoinduced EPR signal from the oxidized primary electron donor P700 of immobilized PS1 has been detected. It has been shown by photoelectrochemical methods that the photoexcitation of PS1 results in electron injection from PS1 to the conduction band of TiO₂.