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Nitrate removal from the synthetic water medium was investigated using Poly (3-Hydroxybutyrate-co-3-Hydroxyvalerate) (PHBV) as solid carbon source and the supporter for microorganisms. The experiments were carried out by batch and continuous modes, respectively. The batch experiment results indicated that a stable denitrification rate (1.22 mg NO3-N/(m2h)) was achieved after 20-day acclimation. The...
Phase-locked loop circuit is an important part of active power filter. In view of the parameters difficult to be determined, an optimal design method is proposed. Based on the studying the basic principle of phase-locked loop circuit, the characteristics of phase detector, filter, voltage controlled oscillator and summary counter are also studied. A mathematical model of phase-locked loop circuit...
The fluctuation of active power filter (APF) dc side capacitor voltage affects the filter's normal work and causes dc side over-voltage. These endanger the safety and reLiable operation of APF. Keeping APF dc side voltage at an appropriate value is an important factor to guarantee that APF has a good performance of compensation. On the basis of analyzing the dc bus voltage control principle and the...
Warpage, high stress in dies and solder joints are introduced in assembly process of a package-on-package component. In this paper, a finite element approach is proposed to predict the warpages and stresses during the full assembly process. By the techniques of element die and birth as well as restart method, the approach is able to transfer the stress and warpage in one process to the next so that...
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