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Do an oxidation experiment by use the ozone technology on ammonium sulfite which is produced as a byproduct in the desulfurization by ammonia absorption process, researched the influences to the oxygenation efficiency of ammonium sulfite under different reaction temperature, aeration, oxidation time, pH value and the initial ammonium sulfite concentration, found out a method and oxidation condition...
Long-term single-frequency stabilisation of an external-cavity semiconductor laser has been demonstrated using a multisegment composite-cavity configuration and an automatic frequency control loop with feedback to the external cavity. Mode-hopping free single-longitudinal-mode oscillation with a linewidth of about 200 kHz and a frequency shift within 28 MHz has been observed over 24 h.
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