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This paper addresses the problem of repetitive control for systems in which the reference input is a periodic signal, with known a period. The sliding mode repetitive controller based on switching-function dynamics is designed to eliminate the disturbances with the same period. In exponential reaching law, the sign function is replaced with power item to decrease chattering and a measure of disturbance-rejection...
Monitoring, managing and controlling the cost of a power transmission and transformation project (PTTP) plays an essential role in meeting the growing power demand and achieving the sustainable power project construction development. A model of cost management and control system for PTTP on the basis of the data mining theory is addressed. Seven tiers are designed to collect cost information, compile...
Polybrominated diphenyl ethers (PBDEs) are bioaccumulative, toxic and persistent, globally distributed organic chemicals in environment. However, very little is known for their aerobic biodegradation. In this research, 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) was selected as a model congener of PBDEs to study its aerobic biodegradation. A new BDE-47 degrading strain BFR01 identified as Pseudomonas...
A model of comprehensive evaluation of regional power quality based on multilevel extension method is first put forward in this paper. A new index system is established, with the characteristic indexes include voltage level, load capacity, number of users, importance of the user, user sensitivity and quality performance of the subregions. Then, the subjective weighting algorithm based on improved...
According to the equivalent figure of electromechanical transfer for piezoelectric vibrator, the piezoelectric transducer is equivalently expressed as a two-port device and the two-way transduce function is deduced. Corresponding simulation experiments indicate that the two-way transducing efficiency of the drive-sensor transducer rises in advance, and then falls with the impedance of acoustic loads...
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