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A hybrid power amplifier (PAhybrid), combining class-D and class-AB amplifier is demonstrated. As a specific structure for class-D, 3-level and 3-phase (3P3L) techniques are applied to reduce the current ripple to 1/12th of that of standard 2-level class-D amplifier. At the same time, the effective switching frequency increases by 6 times. Compared to the previous works which use several uH inductors,...
This paper gives a detailed analysis and discussion of the flow field inside the type of D125 MOCVD reactor chamber through the analysis of three-dimensional mathematical model and calculation. Under a wide range of geometric and process parameters, such as varying total flow rate of gas inlet, chamber pressure, growth temperature, and wafer carrier rotation. It is finally obtained the favorable conditions...
A systematic computational fluid dynamic (CFD) study was performed to investigate the effects of operating parameters of chamber pressure and wafer carrier rotation rate on the GaAs/AlGaAs deposition rate and uniformity in vertical rotating disc metal organic chemical vapor deposition (MOCVD) reactors. It is shown that significant improvement of the reactors efficiency can be achieved by finding the...
This paper presented the operation results in the full-scale suspended carrier biofilm (SCB) process for the treatment of the low C/N ratio monosodium glutamate wastewater (MSGW). After the long-term operation of 185 days, the removal efficiencies of COD, total nitrogen (TN) and ammonia nitrogen (AN) achieved above 89.5%, 91% and 92.5% at the influent organic loading rate (OLR) of 1.25-1.8 kgCOD/(m...
Distributed enterprise systems, which are comprised of multiple software systems, typically communicate using application-layer protocols. Being able to independently test each system's conformance to the protocol specification is important to ensure the overall robustness and reliability of the distributed system. While there exists many modelling languages for network layer protocols, very few tools...
The treatment of coal chemical wastewater by the two-stage anaerobic process was studied in this paper. The results showed that the removal efficiency of chemical oxygen demand (COD), total phenols (TP), and volatile phenol (VP) could reach 53.9%, 52.6%, 84.9%, respectively, which was significantly better than the single-stage anaerobic unit. The division of each unit was different in the two-stage...
Laboratory scale moving bed biofilm reactor (MBBR) was used to treat effluent from post-denitriflcation process in full-scale coal gasification wastewater treatment plant. Methanol was added into the effluent from post-denitriflcation to investigate the effect of surplus methanol on reactor performance. The average effluent COD, NH4-N and NO2-N concentrations were 145.14, 11.88 and 0.22 mg/L for blank...
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