Five types of rare earth/alkaline earth oxide-doped CeO2 superfine-powders were synthesized by a low-temperature combustion technique. The relevant solid electrolyte materials were also sintered by pressureless sinter...Five types of rare earth/alkaline earth oxide-doped CeO2 superfine-powders were synthesized by a low-temperature combustion technique. The relevant solid electrolyte materials were also sintered by pressureless sintering at different temperatures. The results of X-ray diffraction and transmission electron microscopy showed that the grain size of the powders was approximately 20-30 nm, and rare earth/alkaline earth oxides were completely dissolved into ceria-based solid solution with fluorite structure. The electrical conductivities of the Sm2O3-CeO2 system were measured by the ac impedance technique in air at temperatures ranging from 513-900°C. The results indicated that the ionic conductivi- ties of Sm0.20Ce0.8O1.875 solid electrolyte increase with increasing sintering temperature, and the relationship between the conductivities and measuring temperature obeys the Arrhenius equation. Then the Sm2O3-CeO2 material was further doped with other rare earth/alkaline earth oxide, and the conductivities improve with the effective index.展开更多
心源性栓塞性卒中（cardioembolic stroke, CES）通常是由心源性栓子脱落闭塞前循环大血管所致,闭塞血管供血区通常缺乏良好的侧支循环,导致半暗带体积较小,梗死核心区体积较大 ,从而增高再灌注治疗后脑出血风险. CES 的致死和致残率较...心源性栓塞性卒中（cardioembolic stroke, CES）通常是由心源性栓子脱落闭塞前循环大血管所致,闭塞血管供血区通常缺乏良好的侧支循环,导致半暗带体积较小,梗死核心区体积较大 ,从而增高再灌注治疗后脑出血风险. CES 的致死和致残率较高,以往的治疗原则主要通过治疗原发病、对症处理及抗凝治疗来防止 CES 患者病情进展及再栓塞.展开更多
文摘Five types of rare earth/alkaline earth oxide-doped CeO2 superfine-powders were synthesized by a low-temperature combustion technique. The relevant solid electrolyte materials were also sintered by pressureless sintering at different temperatures. The results of X-ray diffraction and transmission electron microscopy showed that the grain size of the powders was approximately 20-30 nm, and rare earth/alkaline earth oxides were completely dissolved into ceria-based solid solution with fluorite structure. The electrical conductivities of the Sm2O3-CeO2 system were measured by the ac impedance technique in air at temperatures ranging from 513-900°C. The results indicated that the ionic conductivi- ties of Sm0.20Ce0.8O1.875 solid electrolyte increase with increasing sintering temperature, and the relationship between the conductivities and measuring temperature obeys the Arrhenius equation. Then the Sm2O3-CeO2 material was further doped with other rare earth/alkaline earth oxide, and the conductivities improve with the effective index.
文摘心源性栓塞性卒中（cardioembolic stroke, CES）通常是由心源性栓子脱落闭塞前循环大血管所致,闭塞血管供血区通常缺乏良好的侧支循环,导致半暗带体积较小,梗死核心区体积较大 ,从而增高再灌注治疗后脑出血风险. CES 的致死和致残率较高,以往的治疗原则主要通过治疗原发病、对症处理及抗凝治疗来防止 CES 患者病情进展及再栓塞.
