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Metal bonding is the most promising die-attach process in high power LED package, which has lower thermal resistance and higher device reliability in comparison with the traditional insulation paste or silver paste die-attach processes. In this project, the eutectic bonding technology, flux-eutectic bonding technology and solder-bonding technology were studied, and the interfacial microstructure was...
Ge is an indirect bandgap material for research interest with possible photonic applications. In previous work, only direct bandgap emission was observed in the epitaxial Ge on Si, but both direct and indirect emissions were observed in the bulk Ge substrates. This discrepancy between epitaxial Ge and Ge substrate may be due to reabsorption of direct emission. In this work, the reabsorption is systematically...
The large public scientific organizations - we call in this paper multi-institute scientific organizations-always play important roles in the national innovation systems, and undertake basic research, applied research, some science frontier research and the research of emerging areas like nanotechnology. To examine the behaviors of these large public scientific organizations is important for monitoring...
Based on atomic force microscopy, high-angle annular dark-field scanning transmission electron microscopy, energy dispersive x-ray spectroscopy, and Raman spectroscopy, Ge outdiffusion effects on SiGe quantum dots to form nanorings are studied using the Ultra-High Vacuum Chemical Vapor Deposition. The epitaxial Si layer grown on quantum dots with SiH4 and H2 precursors can not cover the whole quantum...
Field emission displays (FEDs) have attracted much attention due to its advantages of high luminance, wide viewing angle, fast response and low power consumption. The structure is one of the key issues for the success of FED. Gate structure is widely used in FED for its outstanding advantages, such as lower driving voltage, higher resolution, controllable focusing and so on. In the present work, the...
In this paper, the effect of different preparation process on the secondary electron emission performance was investigated. The different doping methods and preparation techniques such as Solid-Solid doping(SS), Liquid-Solid (LS) doping, Liquid-Liquid (LL) doping, Spark Plasma Sintering (SPS), Air Plasma Spray (APS) method, were introduced into this kind of materials. The microstructure of samples...
Magnetic resonance imaging (MRI) is a widely used method to obtain high quality medical image of the brain. Post-processing MR images with segmentation algorithms enhances the visualization and measurement of soft tissues and lesions. However, the conventional algorithms are not perfect and there are still some regions which are not partitioned accurately. In this paper, a new ant colony algorithm...
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