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Meng L.-Y.,Key Laboratory of Optoelectronic Technology and Systems | Meng L.-Y.,Chongqing University | Yuan S.,Key Laboratory of Optoelectronic Technology and Systems | Yuan S.,Chongqing University | And 2 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2014

A CMOS image sensor for direct X-ray imaging without scintillator was designed. The charge collecting mechanism was theoretically analyzed, and radiation-hardened structure for its sensitive element was designed. The line array with different sensitive elements in pixel was taped out in 0.5 μm DPTM standard CMOS technology and tested by X-ray. The experiment results show that the dark signal output voltage of the line array is about 1 V, and saturated output voltage is 2.4 V. The collected charge and parasitic capacitor increase with sensitive elements. Three sensitive elements in one pixel can achieve higher effective output. ©, 2014, Yuanzineng Kexue Jishu/Atomic Energy Science and Technology. All right reserved. Source


Hu J.,Key Laboratory of Optoelectronic Technology and Systems | Fang L.,Key Laboratory of Optoelectronic Technology and Systems | Zhong P.-W.,Key Laboratory of Optoelectronic Technology and Systems
Materials and Manufacturing Processes | Year: 2013

In this work, three nickel-cobalt-phosphorus composite coatings co-deposited with particles of silicon carbide of three different sizes (40, 200, and 800 nm) were prepared on aluminum alloys using electroless deposition. The fabrication process of composites has been discussed, and the effect of the particle size of silicon carbide on microhardness and corrosion resistance of composites has been studied. The morphology, composition, microstructure, microhardness, and corrosion resistance of deposits were characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Vickers hardometer, and electrochemical workstation, respectively. The results reveal that the particle size has not much effect on the deposition rate of coatings; however, the coating codeposited with smaller particles has greater incorporation amount of particles in number density, less porosity, and finer grains. Furthermore, the incorporation of smaller particles leads to higher hardness and better corrosion resistance of coatings. © 2013 Copyright Taylor and Francis Group, LLC. Source

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