Abstract: A boat wake enhancer is described comprising a water tank mounted at the rear of an inboard motor boat, wherein the tank can be filled and emptied while the boat is in use. When filled, a more desirable wake is provided for water skiing and when emptied, the boat will plane more easily and generate a smaller wake.

Abstract: According to the present invention, a high efficiency no-dropout uninterruptible power supply is presented which will provide desired UPS characteristics while reducing or eliminating undesirable characteristics. In particular, simultaneous improvements are achieved in the areas of switchover transfer response time, droop and transients, EMI generation, power efficiency and heat generation, size, weight, ease of waveshaping, and powerline frequency sensitivity. The invention utilizes dual concurrent feedback loops to control utility-backup power transfer and incorporates a novel method of synchronized AC output generation which allows zero-power switching and simple high-frequency waveshaping control.

Abstract: A process for the production of tripdiolide, triptolide and celastrol comprises the steps of:(a) preparing a cellular inoculum from Tripterygium wilfordii Hook F;(b) inoculating a nutrient growth medium with the cellular inoculum and incubating the inoculated growth medium at 20.degree.-30.degree. C. for up to 8 weeks to produce a cellular product;(c) harvesting the cellular product from the inoculated growth medium; and(d) isolating tripdiolide, triptolide and celastrol from the cellular product and supernatant inoculated growth medium.

Abstract: A regulated DC to DC power supply which minimizes input bus current changes caused by low frequency cyclical load variations is disclosed. The power supply includes a regulator connected to the input bus and controlled by a pulse width modulator. The regulator converts the DC voltage on the input bus to a higher, regulated DC voltage which is supplied to a variable load. A voltage feedback circuit is connected to the output of the boost converter and generates a control voltage which is supplied to the pulse width modulator to regulate the output voltage for variations in line voltage and load. The voltage feedback circuit includes an operational amplifier having a reference voltage supplied to a positive input terminal, and the output of the regulator supplied to a negative input terminal. A frequency response shaping network is connected between the output and the negative input terminal of the operational amplifier.