In this study, Nd-bearing zirconolite-rich ceramics were prepared by solid-state reaction process using CaF2,ZrO2, Ti,TiO2, Fe2 O3 and Nd2O3 as the raw materials. Neodymium was used as trivalent actinide surrogate and...In this study, Nd-bearing zirconolite-rich ceramics were prepared by solid-state reaction process using CaF2,ZrO2, Ti,TiO2, Fe2 O3 and Nd2O3 as the raw materials. Neodymium was used as trivalent actinide surrogate and designed to substitute the Ca and Zr sites of zirconolite with general stoichiometry of Ca1-xZr1-xNd2 xTi2O7（0≤x≤0.3）. Density of Fe-Nd-O sample reaches a maximum value of 4.13 g/cm^2 after being sintered at 1325 ℃ for 42 h. Three major phases, namely zirconolite, perovskite and pseudobrookite, are observed in all these samples. The EDX result shows that Nd2O3 can be successfully incorporated into the lattice structure of the prepared zirconolite-rich minerals and replace the Ca sites of zirconolite and perovskite with Fe3＋ as the charge-compensating ion. Furthermore, the thermal conductivities are all in the range of 1.51-1.67 W/（m·K）. The normalized elemental leaching rates of Ca and Nd in the Fe-Nd-0.2 sample keep in low values of 6.20 × 10^-2 and 4.86 × 10^-4 g/（m^2·d） after 42 d.展开更多
目的:探讨分析角膜塑形镜联合0.01%阿托品滴眼液在控制青少年近视过程中的疗效和安全性。方法:收集2019-01/2022-01在衡水市人民医院眼科诊治的100例100眼(均取右眼数据)青少年近视患者,根据患者意愿采用随机对照原则将患者分为试验组...目的:探讨分析角膜塑形镜联合0.01%阿托品滴眼液在控制青少年近视过程中的疗效和安全性。方法:收集2019-01/2022-01在衡水市人民医院眼科诊治的100例100眼(均取右眼数据)青少年近视患者,根据患者意愿采用随机对照原则将患者分为试验组和对照组,每组各50例50眼。对照组患者采用单一角膜塑形镜治疗,试验组患者采用角膜塑形镜联合0.01%阿托品滴眼液治疗。记录两组患者持续治疗1、3、6、9、12mo后的治疗数据,对比两组患者在治疗前后的屈光度、角膜曲率、眼轴长度(AL)、中央角膜厚度(CCT)、瞳孔直径(PD)、泪膜脂质层厚度(LLT)和泪膜破裂时间(BUT)、角膜总高阶像差(RMSh)、黄斑中心凹下脉络膜厚度(SFCT)、角膜内皮细胞密度(CD)和六边形细胞比例(HEX)等参数。随访期间观察患者不良反应发生情况。结果:治疗后12mo,试验组患者屈光度、角膜曲率、AL分别为-2.42±0.17D、38.89±1.18D、25.44±0.23mm,均显著优于对照组(-2.56±0.19D、40.12±1.65D、25.54±0.19mm,均P<0.05);试验组患者CCT(538±33μm)低于对照组(545±41μm),而试验组患者PD高于对照组(6.38±0.38mm vs 6.12±0.37mm,P<0.05);试验组患者LLT和BUT分别为61.14±8.41nm、9.24±2.05s,均显著高于对照组(56.14±7.22nm、7.27±1.99s,均P<0.05);试验组患者RMSh低于对照组(0.73±0.21μm vs 0.85±0.12μm,P<0.05),而试验组患者SFCT显著高于对照组(289±55μm vs 282±59μm,P<0.05)。此外,治疗后12mo,试验组患者CD和HEX相比较对照组均无差异(均P>0.05)。治疗期间两组患者的主要不良反应为畏光、过敏反应、结膜炎和角膜炎,但两组比较无差异(均P>0.05)。结论:角膜塑形镜联合0.01%阿托品滴眼液相比较单用角膜塑形镜能更有效控制青少年近视发展,且不增加不良反应。展开更多
基金Project supported by the National Natural Science Foundation of China(51672228)the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials(11zxfk26)Science Development Foundation of China Academy of Engineering Physics
文摘In this study, Nd-bearing zirconolite-rich ceramics were prepared by solid-state reaction process using CaF2,ZrO2, Ti,TiO2, Fe2 O3 and Nd2O3 as the raw materials. Neodymium was used as trivalent actinide surrogate and designed to substitute the Ca and Zr sites of zirconolite with general stoichiometry of Ca1-xZr1-xNd2 xTi2O7（0≤x≤0.3）. Density of Fe-Nd-O sample reaches a maximum value of 4.13 g/cm^2 after being sintered at 1325 ℃ for 42 h. Three major phases, namely zirconolite, perovskite and pseudobrookite, are observed in all these samples. The EDX result shows that Nd2O3 can be successfully incorporated into the lattice structure of the prepared zirconolite-rich minerals and replace the Ca sites of zirconolite and perovskite with Fe3＋ as the charge-compensating ion. Furthermore, the thermal conductivities are all in the range of 1.51-1.67 W/（m·K）. The normalized elemental leaching rates of Ca and Nd in the Fe-Nd-0.2 sample keep in low values of 6.20 × 10^-2 and 4.86 × 10^-4 g/（m^2·d） after 42 d.
文摘目的:探讨分析角膜塑形镜联合0.01%阿托品滴眼液在控制青少年近视过程中的疗效和安全性。方法:收集2019-01/2022-01在衡水市人民医院眼科诊治的100例100眼(均取右眼数据)青少年近视患者,根据患者意愿采用随机对照原则将患者分为试验组和对照组,每组各50例50眼。对照组患者采用单一角膜塑形镜治疗,试验组患者采用角膜塑形镜联合0.01%阿托品滴眼液治疗。记录两组患者持续治疗1、3、6、9、12mo后的治疗数据,对比两组患者在治疗前后的屈光度、角膜曲率、眼轴长度(AL)、中央角膜厚度(CCT)、瞳孔直径(PD)、泪膜脂质层厚度(LLT)和泪膜破裂时间(BUT)、角膜总高阶像差(RMSh)、黄斑中心凹下脉络膜厚度(SFCT)、角膜内皮细胞密度(CD)和六边形细胞比例(HEX)等参数。随访期间观察患者不良反应发生情况。结果:治疗后12mo,试验组患者屈光度、角膜曲率、AL分别为-2.42±0.17D、38.89±1.18D、25.44±0.23mm,均显著优于对照组(-2.56±0.19D、40.12±1.65D、25.54±0.19mm,均P<0.05);试验组患者CCT(538±33μm)低于对照组(545±41μm),而试验组患者PD高于对照组(6.38±0.38mm vs 6.12±0.37mm,P<0.05);试验组患者LLT和BUT分别为61.14±8.41nm、9.24±2.05s,均显著高于对照组(56.14±7.22nm、7.27±1.99s,均P<0.05);试验组患者RMSh低于对照组(0.73±0.21μm vs 0.85±0.12μm,P<0.05),而试验组患者SFCT显著高于对照组(289±55μm vs 282±59μm,P<0.05)。此外,治疗后12mo,试验组患者CD和HEX相比较对照组均无差异(均P>0.05)。治疗期间两组患者的主要不良反应为畏光、过敏反应、结膜炎和角膜炎,但两组比较无差异(均P>0.05)。结论:角膜塑形镜联合0.01%阿托品滴眼液相比较单用角膜塑形镜能更有效控制青少年近视发展,且不增加不良反应。
