Fixmans equation was modified for hydrolyzed polyacrylamide,The constants in theequation were determined.An universal MHS equation relating hydrolysis degree with salt concentration was obtained in the form which is suitable for the ranges of parent molecular weights of 10~5～1.3×10~7, of hydrolysis degrees of 4%～40% and of NaCl concentrations of 0.02～0.5mol·L~(-1)at 30℃.The results from the MHS equation are in good agreement with the experi-ments and the reference data.

A relationship between zero-shear viscosity ηo and intrinsic viscosity〔η〕for hydrolyzed polyacrylamide-salt solution was determined on the basis of the theory of macro-molecular solution in the following form ηo=0.745+0.634(C_p〔η〕)+0.193(c_p〔η〕)~2+0.921 (c_p〔η〕)~3.The results from the equation and the MHS equation in part(I)of this paper are in good agreement with the experimental data in the ranges of c_p〔η〕of 1～7.

Li/SF_6 reaction is being used as Rankine cycle heat sources for undersea vehicle propulsion systems.X-ray high-speed radiography technique has been used to investigate the submerged penetration of sulfur hexafluoride into molten lithium for a better understanding of Li/SF_6 reaction.Detailed profiles of density,temperature,jet dimensions and mass fraction of the reaction have been computed.A semiempirical jet length equation is also presented.The results and the predictions of the jet length equation are in agreement with the experimental data.

A real chain-like molecule can be approximately described as a square-well chain.The molecular thermodynamic model for chain-like molecule fluids has been established by adopting the molecular thermodynamic model for hard-sphere-chain fluids as a reference and a perturbation term contributed by the square-well potential.It has a very simple form.For pure normal fluidswith no association,good agreement with experimental data can be obtained by using three tem-perature independent molecular parameters:chain length r,segment diameter σ and interaction energy ε/κ between segments,estimated from saturated vapor pressures and liquid volumes.Excluding the critical region,the deviation of vapor pressures is less than 2% for most substances,the deviation of liquid volume is less than 3%.With the same three temperature independent parameters,the specific volume of polymers with a wide range of temperature and pressure can be satisfactorily correlated.The deviations of specific volume with pressures up to 200MPa are less than 0.2%.

The molecular thermodynamic model for chain-like molecule fluids established by adopting the molecular thermodynamic model for hard-sphere-chain fluids as a reference and a perturbation term contributed by the square--well potential in the previous work have been extended to mixtures.The conformal solution theory,i.e.,the van der Waals one-fluid theory with a temperature independent adjustable binary ineteraction parameter is used to calculate the interaction energy ε/κ between segments of mixtures.Good agreements with experimental data have been obtained for the calculated vapor-liquid equilibria for mixtures of normal fluids with no association.The model can also be used to calculate the binary vapor-liquid equilibria of polymer solutions.

The natural convection of a semi-transparent fluid in an inclined rectangular enclosure irradiated from one boundary was studied numerically and experimentally for the inclination from 0 toπ/2. Two-dimensional motion was assumed.The governing vorticity and energy transport equations were solved by an implicit alternating direction finite-difference method.Steady state isothermals and streamlines were abtained.It was found that the flow pattern was influenced byoptical thickness and inclined angle.A single motion cell was observed when the inclined angle was greater than 6.5π/180,When the inclined angle was equal to 6.25π/180,6π/180,5π/180 and 0,the stable motion mode was observed to be 3,5,7,and 9 roll-cells respectively.A comparison is made with experimental temperature measurement and found to be good.

After analyzing the drawbacks of the Jobacks equation for estimating △G_f~ ,a new theoretical formula is proposed.According to molecular orbital theory and taking into consideration the interactions among all the atoms of a molecule and restrictions in a whole molecule which depend on the electron effect,the author discovered the fact of relative independence of groups or bonds.By applying the matrix method,a semi-theoretical formula was derived.To check this equation,the data of 118 organic polar and 292 nonpolar compounds were used with an average error of 1.73% for 410 experimental values.This method is far better than the other methods reported in literature.

A New statistical thermodynamic model of surface tension for liquid mixtures is developed by using Davis model.When molecular energy parameter is considered as temperature dependent,the calculation results of surface tension for one-component system have been greatly improved.The total average relative deviation for 29 different pure liquids is less than 1.0%.The surface tension for 22 binary liquid mixtures has been also predicted and correlated,and the calculation deviations are 5.48% and 1.95% respectively.Using the adjustable parameters obtained from relevant binary systems,this equation can predict the surface tension of multicomponent liquid mixtures with good accuracy.The calculation results show that the model proposed is reliable and convenient for engineering application not only for pure liquids but also for multicomponent systems.

A reflection-type optical fiber probe was used to measure the local transient solid concentrations in circulating fluidized beds with smooth and membrane walls,and the dynamic characteristics in beds with two different geometric structure of walls were analyzed with the method of time series analysis.According to the results,there existed obvious non-even characteristics of temporal-spatial structure,the geometric structure of walls had obvious effects on the flow characteristics of gas and solids near the wall.

Air cathode instead of tin cathode is used to synthesize electrochemically sodium perborate in Na_2CO_3-Na_2B_4O_7 medium.The electrolysis result indicates that the cathode current efficiency is 65%～54%,the corresponding cathode current density being 30～50mA·cm~(-2).X-ray diffraction indicates that the crystal product is NaBO_2·H_2O_2·3H_2O.Constant current chronopo-tentiometry is used to determine the relation between time and potential in Na_2B_4O_7-H_2O_2 medium and in Na_2CO_3-H_2O_2 medium.The rate constant for the complexation of hydrogen peroxide and borate ion and the dissociation rate constant of perborate ion are 7.21×10~3 L·s-l·mol~(-1)and 2.14×10~2s~(-l)respectively,which are calculated from the relati on between iτ~(1/2)and i in Na_2B_4O_7-H_2O_2 medium.The iτ~(1/2)is independent of i in Na_2CO_3-H_2O_2 medium,which indicates that the dissociation rate of percarbonate ion is very fast.

Based on the experiments this paper describes how the vibration energy is introduced into the vibrated bed(VB)and vibrated fluidized bed(VFB).For VB the vibration energy is in-troduced by collision between the vibrating plate and the particle bed,and for VFB by wave continuous propagation in the suspended particle bed.The wave characteristics are affected by the bed properties.Behaviors of bubbles in the bed can be studied by analyzing the wave frequency spectrum.

This paper reviews these works on the control of the pilot-scale fixed-bed reactors which have the prospect of Tndustrial application.A few comments and onclook of fixed-bed reactor control are also been presented.

The authors calculated the highest temperature that may be attained by a single particle after passing through a shock wave.They found that the theory and the interpretation for experimental results,which was presented in the paper"The Pulverizing Effect of Shock Wave in Shock Wave in Supersonic Nozzle"(Vol.44,6,1993),are invalid.According to the experimental parameters of the above mentioned paper,a single particle can not crack after passing through a shock wave because of heating.

The characteristics of magnetically stabilized bed(MSB)were studied in a three-phase system with nitrogen,water and iron powder(and/or Ni-RE-P amorphous alloy catalyst)as gas,liquid and solid phase respectively.The operating state was observed,and the effect of magnetic field and superficial velocity of gas on minimum fluidization velocity were examined.Finally,the MSB using mixture of iron powder and Ni-RE-P amorphous alloy catalyst as solid phase was studied.

The enzyme β-galactosidase was entrapped in a pressure-sensitive poly(N-iso-propylacrylamide)gel.By using o-nitrophenol β-D-galactopyranoside(ONPG)and lactose respectively as the substrate,experiments on the immobilized enzymic reaction were carried out.Operations under constant pressure and pressure cycling conditions were compared with regard to the increase in conversion rate with reaction time.Remarkable improvement of the immobilized enzymic reaction was achieved during pressure cycling operations,owing to the enhancement of mass transfer inside the gel beads.

The rheological properties of high and low density polyethylene(HDPE and LDPE)melts were investigated by using capillary rheometer,and preliminary verification for the half natural converging angle equation of non-Newtonian fluids which was derived in a prerious work was made.The results showed that the natural convergent angles of the sample melts calculated by using the equation were in correspondence with the values reported in the literature under the relevant conditions.

The K_ya,K_La and η were measuerd in the helical rotating absorber for flue gas desulphurization processes.The results showed that the volumetric mass transfer coefficients were about1～2 orders of magnitude larger than those obtained in packed columns under similar operating conditions and column diameter.The desulphurization efficiencies η for the absorption of SO_2 by water were 60%～80%,which are much higher than those for conventional whirlflow plate tower.The higher the rotating speed is,the higher the K_y,K_L and η will be.