The regeneration of the resin was studied that regenerant of HCl was effective when the ratio of the quality of HCl to the volume of the resin was 350.The kinetics mechanism of metal ion exchange process on 1600H was studied and the results indicate that this ion exchange process was controlled by diffusion of liquid film, and by the data obtained from experiments we got the reaction rate and equation of diffusion of liquid film at different temperatures.

The oxidation kinetic equation of diffusion controlling type are obtained separately for sialon matrix phase and SiC particle phase and sialon bonded SiC multiphase materials in multiphase materials firstly, which illustrate the protective effect of sialon matrix phase to SiC particle phase.

3. Taking microstructure as medium, relationship between diffusion coefficient and hydraulic conductivity was developed, and calculation equation of diffusion coefficient was obtained.

Based on the factors that affect the diffusion of vehicle exhaust gas for urban road, the general equation of diffusion box model of vehicle exhaust gas is established by analyzing dimensions.

Theoretical distributions of the hydrogen concentration were computed for an infinite cylinder model using the differential equation of diffusion.

As a result, evolution of the density of excited atoms within a layer of gas or a non-equilibrium plasma can be described by a simple differential equation of diffusion type.

A kinetic phenomenological model of the processes of atomization for atomic-absorptional spectrometry with electrothermal atomization that is based on solution of a one-dimensional equation of diffusion with two independent sources is suggested.

The model may involve diffusion or other random walk processes, leading to the solution in terms of the partial differential equation of diffusion or in terms of probability distributions.

We show that for a medium strictly satisfying the equation of diffusion, the method gives quite good results with nevertheless some inaccuracies for the extreme values of water contents.

In this paper a number of problems in connection with the polarographic oxygen electrode are discussed.1. The equation of diffusion current for the dissolved oxygen in the body of the electrode has been derived and examined experimentally.2. The sources of the residual current has been analysed and found to be attributed to the crevice involved in Pt-glass border.3. According to the calculation of heat conduction of the system designed by us, the electrode should be independent of temperature.4. A design...

In this paper a number of problems in connection with the polarographic oxygen electrode are discussed.1. The equation of diffusion current for the dissolved oxygen in the body of the electrode has been derived and examined experimentally.2. The sources of the residual current has been analysed and found to be attributed to the crevice involved in Pt-glass border.3. According to the calculation of heat conduction of the system designed by us, the electrode should be independent of temperature.4. A design of the detector is described, thereby the contamination of the working electrode surface by the surface active substances can be avoided.Through the solution of these problems, the useful range of the oxygen cathode has been extended to less than 2 ppm in gases, and the response time has been reduced to 10 min (21％～0.01％). Moreover, the wear out time for the electrode has been extended over 6000 hours.

The exact expressions of concentration and local or average Sherwood number, Sh or Sh for non-Newtonian power law fluids when the flow index n takes any positive rational value, have been obtained by solving the differential equation of diffusion together with the velocity distribution in the falling film.

The mass transfer problem of oxygen in a plate membrane oxygenator without oxygenation was studied. For oxygen-blood system the mathematical model was presented. It was established on the basis of mass transferring chracteristics of oxygen in blood medium and resulted by the method of mathematical developing, i. e. by solving the relevantdifferential equations of diffusion. The theoretical expression of dimentionless average concentration and Sherwood number were obtained in this way and the results was...

The mass transfer problem of oxygen in a plate membrane oxygenator without oxygenation was studied. For oxygen-blood system the mathematical model was presented. It was established on the basis of mass transferring chracteristics of oxygen in blood medium and resulted by the method of mathematical developing, i. e. by solving the relevantdifferential equations of diffusion. The theoretical expression of dimentionless average concentration and Sherwood number were obtained in this way and the results was apparently supported by experimental facts in a silicone membrane oxygenator.The dimentionless correlation is given as follows:(?)_(LO)=0.055 Re~(0.59)Sc~(0.33)which, according to authors' opinion, can be used with advantage in the designing work of plate membrane oxygenator.