The in-plane thermoelectric generator (TEG) was ingeniously designed when the thermal gas flowed over the carbon nanotube (CNT) membrane at the modest speed of a few meters per second. It was composed of the glass substrate, aurum electrodes and CNT membrane synthesized by a floating catalyst chemical vapor deposition method. In the air under atmospheric pressure, the experimental results showed that the maximal output voltage could reach 1.7 mV. It related not only with the temperature difference between the hot-side and cold-side, but also the temperature gradient of the CNT membrane which was closely dependent on the velocity and temperature of the gas flow. The multi-physical power mechanism was applied to interpret the energy conversion, which included the coupling relation of the fluid dynamics, heat transmission and Seebeck effect. This novel method could effectively enhance the output voltage, extend the applied range of TEG and had a fine prospect.

The article established the mathematical model of ultrasonic flaw echo signals. First, the basic theory of wavelet transform is introduced, the principle of the wavelet threshold de-noising method is analyzed; Then on the basis of soft and hard threshold function, the paper proposes a method based on lifting wavelet de-noising. And from two aspects of signal-to-noise ratio (SNR) and mean square error (MSE) the de-noising performance is analysed. The results show that the method improved the shortcomings of soft and hard threshold de-noising method, and got a better de-noising performance and higher signal-to-noise ratio. So in real-time signal de-noising aspect the lifting wavelet has a very good application prospect.

The multilayer adhesive structure of solid rocket motors (SRM) is studied in this paper. The ultrasonic pulse-echo measuring method was described to measuring multilayer adhesive structure acoustic parameters. The sound velocity of the thermal barrier and cladding layer was measured. The acoustic impedance and acoustic attenuation coefficient was gained by theoretical calculation. A method of equivalent thermal barrier was proposed to analyzing the transmission coefficient and the reflection coefficient. The experimental results indicate that the method of equivalent thermal barrier can simplify the SRM theoretical model of multilayer adhesive structure, and thus it can effectively provide a good help for SRM structure acoustic research.