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Astronomy cloud computing environment is a cyber-Infrastructure for Astronomy Research initiated by Chinese Virtual Observatory (China-VO) under funding support from NDRC (National Development and Reform commission) and CAS (Chinese Academy of Sciences). Based on virtualization technology, astronomy cloud computing environment was designed and implemented by China-VO team. It consists of five distributed nodes across the mainland of China. Astronomer can get compuitng and storage resource in this cloud computing environment. Through this environments, astronomer can easily search and analyze astronomical data collected by different telescopes and data centers , and avoid the large scale dataset transportation.
High purity anatase titanium dioxide (TiO2) and iron (Fe)-doped TiO2 nanocrystals were prepared by a continuous flow synthesis method using isopropanol-water mixtures as solvent in supercritical or near-critical conditions. The method allows complete control of size (5–20 nm) and crystallinity (10–100%) of the nanoparticles and provides quick synthesis with a residence time of ∼10 s that can be scaled up to commercial production. It is found that the average crystallite size can be easily controlled by adjusting the ratio between isopropanol and water in the solvent, whereas the crystallinity is mainly controlled by the reaction temperature. As-prepared Fe-doped TiO2 nanoparticles appear to be single phase, but Fe3+ ions most likely do not occupy the Ti4+ sites in the anatase TiO2 crystal structure.
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