The preparation parameters affect the synthesis process and the charcteristics of nanosized silicon nitride was discussed. The optimum preparation conditions are as follows. The power density of CO2 laser is 2000 W/cm2. The reactant gas ratio of NH3/SiH4 is 4. The total flow rate of reactant gases is 200cm3/s.
With the experimental facilities employed, such conditions were found at a power of 3.8 × 0. 80kW, a carrier gas flow of 0. 80L. min-1 and an observation height of 1. 0 cm. Under the compromise conditions we determined the detection limits of 27 elements.
Dividing consumers into groups according variant running character and variant load succession rate,calculating power of every group according different experiential value of demanding coefficient,sum of power of every groups multiply synchronization coefficient is total calculational power.
The ohmic polarization is the main cause of decreasing of the output power and increasing the thickness of electrolyte results in the decrease of output power of cell. The influence of the length of combustion zone on the steady and transient operation of tubular SOFC was calculated.
In comparison with the normal ICP-AES, both output power of high frequency generator and flow rate of carrier gas do not give aopparent difference on effection their exciting characteristics , so the infleuences of these two parameters on sensitivities of REE determination are nearly the same .