Zheng Sheng

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The properties of the long-term oscillations in the middle atmosphere have been investigated using the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature data and Fabry–Perot interferometer (FPI) data. Results for SABER temperature show that the semiannual oscillation (SAO) has three amplitude maxima at altitudes of 45, 75,(More)
Among many factors decreasing the control performance of coal-fired drum type boiler, nonlinearity is the major one. While boiler operated, the fuel flow rate affects directly the drum pressure and this in turn affects the throttle pressure. This can lead to a series cascade control structure: the output of primary controller changes the set point of drum(More)
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