Gear-shape CeO2 microstructures have been synthesized via a facile hydrothermal method with Ce（NO3）3-6H20 as the cerium source, NHaHCO3 as both the precipitator and the carbon source, and cetyltrimethyl ammonium bro...Gear-shape CeO2 microstructures have been synthesized via a facile hydrothermal method with Ce（NO3）3-6H20 as the cerium source, NHaHCO3 as both the precipitator and the carbon source, and cetyltrimethyl ammonium bromide （CTAB） as the surfactant. X-ray diffraction （XRD） inferred that the synthesized CeO2 microstructures exhibited a fluorite structure. The band gap （Eg） of CeO2 samples is larger than that of bulk. X-ray photoelectron spectroscopy （XPS） showed that there are plenty or Ce3＋ ions and oxygen vacancies at the surface of CeO2 samples. All the synthesized CeO2 samples exhibited the room temperature ferromagnetism, and the saturation magnetization increases with the increases of lattice parameter and Eg. The room temperature ferromagnetism mechanism of gear-shape CeO2 is mainly attributed to the influence Ce3＋ ions.展开更多
A component synthesis vibration suppression (CSVS) method for flexible structures is put forward. It can eliminate any unwanted orders of flexible vibration modes while achieves desired rigid motion. This method has ...A component synthesis vibration suppression (CSVS) method for flexible structures is put forward. It can eliminate any unwanted orders of flexible vibration modes while achieves desired rigid motion. This method has robustness to uncertainty of frequency, which makes it practical in engineering. Several time optimal and time-fuel optimal control strategies are designed for a kind of single flexible link. Simulation results validate the feasibility of our method.展开更多
基金financially supported by the Anhui Provincial Natural Science Foundation (No. 1508085SME219)
文摘Gear-shape CeO2 microstructures have been synthesized via a facile hydrothermal method with Ce（NO3）3-6H20 as the cerium source, NHaHCO3 as both the precipitator and the carbon source, and cetyltrimethyl ammonium bromide （CTAB） as the surfactant. X-ray diffraction （XRD） inferred that the synthesized CeO2 microstructures exhibited a fluorite structure. The band gap （Eg） of CeO2 samples is larger than that of bulk. X-ray photoelectron spectroscopy （XPS） showed that there are plenty or Ce3＋ ions and oxygen vacancies at the surface of CeO2 samples. All the synthesized CeO2 samples exhibited the room temperature ferromagnetism, and the saturation magnetization increases with the increases of lattice parameter and Eg. The room temperature ferromagnetism mechanism of gear-shape CeO2 is mainly attributed to the influence Ce3＋ ions.
基金This project is supported by National 211 Project.
文摘A component synthesis vibration suppression (CSVS) method for flexible structures is put forward. It can eliminate any unwanted orders of flexible vibration modes while achieves desired rigid motion. This method has robustness to uncertainty of frequency, which makes it practical in engineering. Several time optimal and time-fuel optimal control strategies are designed for a kind of single flexible link. Simulation results validate the feasibility of our method.
