Origination and Elimination of the Surface Flow Lines Crack of Investment Stainless Steel Castings;

Geochemistry and petrogenesis of the Tertiary rhyolite from the Boyang area,northeastern margin of the Qinghai-Tibet plateau;

The prismatic joint characteristics of the Mesozoic rhyolite of the Shanmen, Siping, Jilin Province and its origin significance;

The geologic features of the early Cretaceous rhyolite inthe Shanmen area,Siping,Jilin province;

Enhancement of ripple current capacity of electrolytic capacitors;

They are higher ESR, overload ripple current, destruction by the foreign maters, abnormal voltage variation in the local power supply network, etc.

In practical,taken in the rectifi- er ripple current of the DC bus and the ripple current created by the inverter are the most important functions of electrolytic Capacitor used in three phase bridge rectifier output bus.

The ore deposit was surrounded by fractures of NE and NW directions,and generically relat-ed to rhyolite porphyry,The early alterations are mainly of K-feldsparization and biotitiza-tion,and the laters are mainly of silication,sericitization and propylitization.

Applying the reverse coupling inductor to the interlock parallel Boost-converter,we analyze the influences of the coupling coefficients of inductor to the current ripple and the dynamic response of the interlock parallel Boost-converter,and provide the design method for the integrated reverse coupling inductor.

Different from conventional two-level PWM switching power amplifier, the switching power amplifier can achieve current ripple reduction.

With high conversion ratio, the interleaved Boost converter operates at a very large duty cycle , which leads to large current ripple and poor efficiency.