The solubility parameters of Hydroxyl--terminated polybutadiene (HTPB) at 50°, 60°and70°C were determined by inverse gas chromatography. The solubility value of HTPB at 25°Cobtained by linear extrapolation was δ_2=9. 13. The entropic component Xs in the interactionparameter X_(12) of HTPB with nine solvents was estimated.
The three fuels can be instantly ignited by laser with the fluxes of more than 2.3kw/cm 2. The minimum incident fluxes for ignition are also determined by means of linear extrapolation and the values for derosene, light and heavy diesals are respectively 0.67, 0.46 and 0.32kw/cm 2. The experimental formula of ignition time is presented with the form of t=kI a(T/100) b.
The simulation result show that the linear extrapolation algorithm can raise the maximum absolute deviation of evaluation of HF channel's BER to 0 89, the maximum relative deviation of its to 35 7%. \;
Based on a kind of short-wave FH-DQPSK system demodulating technology of FFT and according to PER estimation in the DQPSK system with Rayleigll fading channel,this paper proposes a method to estimate BER using adaptive linear extrapolation algorithm, and analyses the confidence level about this method.