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This study developed an in vitro system by co-culturing HK-2 cells with different concentration of hydroxyapatite (HAP) and/or macrophage cells to simulate the internal environment of urolithiasis as far as possible, investigating the regulatory effects of macrophage cells on HAP-induced expression of relative inflammatory factors of HK-2 cells. The control group (H group) was only comprised of HK-2...
The typical VR for server CPU or memory is multi-phase with constant switching frequency and drive voltage. This only provides the best VR efficiency in certain load ranges. In this paper, we will introduce a new VR technology. This technology attempts to enhance the VR power efficiency and reduce the power loss through programming the digital VR with different VR factors (phase counts, switching...
This paper proposed an improved dimmable electronic ballast with T-type resonant inverter at very high frequency. Making the ballast working above the highest frequency of the acoustic arc resonance is a good method to avoid the acoustic resonance of HID lamps. The parameters designing of the T-type resonant inverter guarantees the success in the HID lamps performance. And it is more important for...
This paper proposed a power control strategy of the general three-stage electronic ballast (Eballast) for HID lamps. This control strategy utilizes the dc input current as the power level signal. Since the input of the DC/DC stage is constant, the control of the input current ensures the control of the lamp power. This approach is more feasible for digital controlled Eballast. As it only needs one...
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