Yufei Xi

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The present retrospective study aimed to investigate the antibiotic susceptibility of bacteria at Shanghai First People's Hospital (Shanghai, China) between 2009 and 2011. An increasing trend of antibiotic resistance was observed in this hospital between 2009 and 2011. Escherichia coli, Acinetobacter baumannii and Staphylococcus aureus were the most(More)
The Earth's engine is driven by unknown proportions of primordial energy and heat produced in radioactive decay. Unfortunately, competing models of Earth's composition reveal an order of magnitude uncertainty in the amount of radiogenic power driving mantle dynamics. Recent measurements of the Earth's flux of geoneutrinos, electron antineutrinos from(More)
—Fractal geometry is a powerful tool for nonlinear signal processing. It has quickly developed recently. Geological process is complicated and a lot of geological phenomena or their signals have non-linear features, which can be described by fractal geometry. Power spectral method is used to calculate aeromagnetic signal fractal dimension. We also analyzed(More)
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