The irradiation effect of DC-DC power converter under x-ray
The irradiation response of DC-DC power converter was studied using X-ray source with whole and local irradiation method. It was indicated that the irradiation response of the different part of circuit was represented different effect. The VDMOSFET of DC-DC power converter was tremendous irradiation affected, and PWM and Shottky diode was exiguous affected, and the trend of DC-DC power converter optical-coupler parameters affected by optical-coupler was reversely with other part of DC-DC circuits.
A New Irradiation Technology—Low Energy X-ray Radiation
The mechanism of hole-trapping in oxide and interface state buidup was discussed un- 
der irradiation in this paper first, then a low energy X-ray irradiation system was introduced, final- 
ly the variety of nMOSFET threshold voltage after X-ray irradiation was studied, It is shown that 
the influence on nMOSFET threshold voltage of X-ray is correlated with that of ~(60)Co.
Brushite-collagen composites for bone regeneration.
Brushite-based biomaterials are of special interest in bone regeneration due to their biocompatibility and biodegradability; on the other hand, collagen is a well-known osteoconductive biomaterial. In the present study a new brushite-collagen composite biomaterial is reported. This new biomaterial was prepared by combining citric acid/collagen type I solutions with a brushite cement powder. The obtained biomaterial was a cement paste, with improved handling properties. The effect of collagen on the setting reaction of brushite cement was studied, and was found to speed up the cement setting reaction. The cement paste set into a hard ceramic material within 18.5+/-2.1min and had compressive strength similar to that of spongeous bone (48.9+/-5.9MPa in dry conditions and 12.7+/-1.5MPa in humid conditions). The combination of collagen with citric acid revealed an interesting synergistic effect on the compressive strength of the composite material. Moreover, this new biomaterial had excellent cohesion properties (ninefold better than brushite cement), and high cellular adhesion capacity (threefold higher than brushite cement). The composite biomaterial described in this study combines good handling properties, compressive strength, cohesion and cell adhesion capacity, along with the osteoconductive and biodegradable properties inherent in brushite and in collagen-based biomaterials.