Wei-wei Shao

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A new type of piezoelectric transformer which is based on the stress distribution of the piezoelectric transformer to change the output voltage is presented. In this paper, we verified the feasibility of the principle of the new piezoelectric transformer from the simulation and experiment. The experiment results show a good consistent with the theoretical(More)
In this paper, the electrical equivalent circuits of the piezoelectric transformer (PT) with heat transfer system (HTS) had been studied. A heat transfer model of the longitudinal vibration PT had been built and an experiment study on the equivalent circuit model of the PT with HTS was proposed. this work provides a useful information for the application of(More)
Five sesquiterpenoids, 1α,8α-epidioxy-4α-hydroxy- 5αH-guai-7(11),9-dien- 12,8-olide. (1), 8,9-seco-4β-hydroxy-1α,5βH-7(11)-guaen-8,10-olide (2), 8α-hydroxy-1α, 4β,7βH-guai-10(15)-en- 5β,8β-endoxide(3), 7β,8α-dihydroxy-1α,4αH-guai-10(15)-en-5β,8β-endoxide(4) and 7-hydroxy-5(10),6,8-cadinatriene-4-one(5), together with seven known analogs were isolated from(More)
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