11. Lasers with ultraviolet and infrared wavelengths and nanosecond to femtosecond pulse widths have been used. 12. At midway, the pulse width is 50 % and the output is a triangle wave. 13. Furthermore, the " duty cycle " of the pulse width can be modulated as well. 14. A new article Water electrolysis by Pulse Width Modulation has appeared, been deleted and reappeared. 15. This is the basis of pulse width modulation. 16. The optical bandwidth of a pulse cannot be narrower than the reciprocal of the pulse width . 17. In the tests, repetition rate of 50 Hz was used, with pulse width between 10-70 microseconds. 18. The major advantage of using the pulse width modulation technique is the reduction of higher order harmonics. 19. A dynamic pulse width output adds harmonic expression to the attack and decay phase of some voices. 20. Moving surfaces impose a pulse width modulation.
