Self-propagating High-temperature Synthesis of Sm and Zr Co-doped Gd2Ti2O7 Pyrochlore Ceramics as Nuclear Waste Forms

We reported a rapid synthesis of Sm^(3+)/Zr^(4+)co-doped Gd2Ti2O7 pyrochlore simulated nuclear wastes solidification by self-propagation plus quick pressing technique.With increment excess contents of Sm2O3 and ZrO2 from 0 to 10wt%,the phase composition of the products is a mixed phase of pyrochlore structure and defective fluorite structure by X-ray diffraction(XRD)analysis and Raman spectrum.In addition,the SEM results demonstrate the fracture surface and microstructure of Gd2Ti2O7-based pyrochlore.The densified pyrochlore waste form exhibits high bulk density of 5.56 g·cm^(-3) and vickers hardness of 11.20±0.2 GPa.The leaching tests show that the elemental leaching rates of Gd,Sm,and Cu after 42 days are 1.92×10^(-4),1.51×10^(-4),and 3.90×10^(-3) g·m^(-2)·d^(-1),respectively.

中药保留灌肠缓解产后宫缩痛的效果观察

目的:观察中药保留灌肠在缓解产后宫缩痛的效果.方法:选择2018年7月-2019年1月在东莞市厚街医院正常分娩的经产妇发生产后宫缩痛患者中抽取80例,将其随机等分为治疗组和对照组,两组均采取产后常规护理,治疗组在此基础上进行中药少量保留灌肠缓解产后疼痛.采用视觉模拟评分法在产后进行疼痛评分,观察产后宫缩痛情况.结果:治疗组产妇宫缩痛明显轻于对照组,差异有统计学意义(P<0.05).结论:中药保留灌肠能有效缓解产后宫缩痛的疼痛程度,减轻产妇痛苦,促进产后机体康复,值得临床推广.

Linear Electron-Phonon Interaction in Organic Spectral Hole-Burning Materials

The linear electron-phonon interaction in polymethylmethacrylate(PMMA)doped with electron donor zinc-tetraphenylbenzoporphyrin(ZnTPBP)and acceptor p-hydroxybenzsAdhyde(PHBA)t or p-aininoacetophenone(PAAP)was investigated by photon-gated spectral hole-burning(PHB),The aim is to study the factors that&ffed the linear elec iron-ph on on coupling and the thermal stability of spectral holes in the organic film samples.

燃烧反应制备Y2-xGdxTi2O7烧绿石及其作为核废物固化材料的稳定性研究

烧绿石基陶瓷材料是理想的核废物固化基材,本研究采用燃烧反应结合快速加压工艺,以Cu O为氧化剂、Ti为还原剂,在5 min内快速制备出烧绿石基Y2-xGdxTi2O7/Cu复合材料固化体。以Gd作为三价锕系核素的模拟物,设计Gd取代Y2-xGdxTi2O7烧绿石中的Y位。结果表明,Gd能完全取代Y位形成Gd2Ti2O7烧绿石,所得产物没有杂质相出现,且在烧绿石基体中没有出现相分离现象。选择Gd1.0样品进行浸出试验,结果表明该样品具有优异的水热稳定性,Cu、Y和Gd元素的42d归一化浸出率分别低至2.4×10^-2、1.1×10^-5和5.3×10^-6 g·(m2·d)-1。