1. Firstly, basic transmission equation of transmitted light is given using coupled-mode theory in Fiber Bragg Gratings and physics meaning of every parameter is given.

2. The radiation transmission equation is numerically solved by high temperature gas high resolution HITEMP database for spectral radiance distributions of CO2 and H2O.

3. According to the field matching theorem, the transmission equation and scatter matrix expressions of the coaxial extractor system with support post are educed in this paper.

4. The main method is to use gear transmission equation of no flank gear clearance, and the method is feasible after putting it into practice.

5. The power transmission equation of VSC is simplified by coordinate transformation, and the control system for transmitted power of VSC is designed by use of unsymmetrical triggering method.

6. Based on optical pulse transmission equation in birefringent optical fibers, the chirps caused by second- order chromatic dispersion, self-phase modulation, cross- phase modulation were analyzed.

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7. Transmission equation of acoustic wave in layered media is given. By numerical calculation, the effects of acoustic parameters of each layer on the sound wave reflection and attenuation is analyzed.

8. The high frequency signal propagation on power cable is demonstrated theoretically by solving transmission equation and analysing the stable solution.

9. After that, this paper briefly introduced the Optical splitter's characteristics of amplication by calculate a uniformly widen three energy level ratio equation and transmission equation.

10. This paper describes the formation of the harmonic current in trolley wire and the developing process of the harmonic resonance, also the analysis of the transmission equation of the harmonic current.

11. The project calculating the average and instantaneous soil heat flux is deduced from the heat transmission equation satisfied by the ground temperature.