Alkali induced morphology and property improvements of TiO2 by hydrothermal reaction were investigated. The products were characterized by SEM, TEM, XRD, TG, EDX, FT-IR and DRS. The results indicate that, with the pha...Alkali induced morphology and property improvements of TiO2 by hydrothermal reaction were investigated. The products were characterized by SEM, TEM, XRD, TG, EDX, FT-IR and DRS. The results indicate that, with the phase transformation from anatase to rutile, the morphologies changed from high aggregated particles to nanofibers with the diameter of about 100 nm and the length up to several tens of micrometers, meanwhile the process is controllable by manipulating the nature of the alkali, alkalinity and hydrothermal temperature. DRS analysis shows the property improvement of the nanofibers in the UV-Vis light absorption compared with the raw materials, implying the products have potential application in photocatalysis.展开更多
Highly sensitive voltammetric method for the determination of estrogens, based on the enhancement effect of cetyltrimethylammonium bromide (CTAB) has been described. In the presence of CTAB, the oxidation peak current...Highly sensitive voltammetric method for the determination of estrogens, based on the enhancement effect of cetyltrimethylammonium bromide (CTAB) has been described. In the presence of CTAB, the oxidation peak currents of estrogens (estradiol, estrone, estriol, estradiol valerate and diethylstilbestrol) as the carbon paste electrode (CPE) increased significantly after open-circuit accumulation. The peak current was proportional to the concentration of estradiol over the range from 5×10?9 to 2.5×10?6 mol·L?1. The detection limit was 8×10?10 mol·L?1 at 6 min of accumulation. The total amounts of estrogens in the blood serums were determined and the average recovery was 104.92%. Under the conditions used, the electrode process of estradiol was examined the mechanism for peak current enhancement was also discussed.展开更多
目的开发一套能同时诊断肝纤维化、炎症及脂肪变性的智能系统。方法基于慢性肝病(chronic liver disease,CLD)患者的多模态超声成像数据,包括超声B模式图像、剪切波弹性成像、瞬时弹性成像数据及其原始射频数据,使用定量超声方法和影像...目的开发一套能同时诊断肝纤维化、炎症及脂肪变性的智能系统。方法基于慢性肝病(chronic liver disease,CLD)患者的多模态超声成像数据,包括超声B模式图像、剪切波弹性成像、瞬时弹性成像数据及其原始射频数据,使用定量超声方法和影像组学方法提取这些数据的多模态特征,以超声引导的肝穿刺活检结果为金标准,使用支持向量机以二分类的方式搭建智能分级诊断系统,同时实现肝纤维化、炎症和脂肪变性的智能辅助诊断。结果本方法对于肝纤维化分级的四个二分类任务:≥F1、≥F2、≥F3、≥F4,受试者工作特征(receiver operating characteristic,ROC)曲线下面积(area under the curve,AUC)达到了0.81、0.80、0.89、0.87;对于炎症分级≥A2、≥A3、≥A4,AUC为0.80、0.93、0.93;对于脂肪变性分级≥S1、≥S2,AUC为0.75、0.92。结论本研究提出了基于多模态超声成像数据的CLD肝纤维化、炎症和脂肪变性的智能分级诊断系统,该系统在3种CLD的智能评估中取得了较好的结果,有望推广至临床应用。展开更多
文摘Alkali induced morphology and property improvements of TiO2 by hydrothermal reaction were investigated. The products were characterized by SEM, TEM, XRD, TG, EDX, FT-IR and DRS. The results indicate that, with the phase transformation from anatase to rutile, the morphologies changed from high aggregated particles to nanofibers with the diameter of about 100 nm and the length up to several tens of micrometers, meanwhile the process is controllable by manipulating the nature of the alkali, alkalinity and hydrothermal temperature. DRS analysis shows the property improvement of the nanofibers in the UV-Vis light absorption compared with the raw materials, implying the products have potential application in photocatalysis.
文摘Highly sensitive voltammetric method for the determination of estrogens, based on the enhancement effect of cetyltrimethylammonium bromide (CTAB) has been described. In the presence of CTAB, the oxidation peak currents of estrogens (estradiol, estrone, estriol, estradiol valerate and diethylstilbestrol) as the carbon paste electrode (CPE) increased significantly after open-circuit accumulation. The peak current was proportional to the concentration of estradiol over the range from 5×10?9 to 2.5×10?6 mol·L?1. The detection limit was 8×10?10 mol·L?1 at 6 min of accumulation. The total amounts of estrogens in the blood serums were determined and the average recovery was 104.92%. Under the conditions used, the electrode process of estradiol was examined the mechanism for peak current enhancement was also discussed.
文摘目的开发一套能同时诊断肝纤维化、炎症及脂肪变性的智能系统。方法基于慢性肝病(chronic liver disease,CLD)患者的多模态超声成像数据,包括超声B模式图像、剪切波弹性成像、瞬时弹性成像数据及其原始射频数据,使用定量超声方法和影像组学方法提取这些数据的多模态特征,以超声引导的肝穿刺活检结果为金标准,使用支持向量机以二分类的方式搭建智能分级诊断系统,同时实现肝纤维化、炎症和脂肪变性的智能辅助诊断。结果本方法对于肝纤维化分级的四个二分类任务:≥F1、≥F2、≥F3、≥F4,受试者工作特征(receiver operating characteristic,ROC)曲线下面积(area under the curve,AUC)达到了0.81、0.80、0.89、0.87;对于炎症分级≥A2、≥A3、≥A4,AUC为0.80、0.93、0.93;对于脂肪变性分级≥S1、≥S2,AUC为0.75、0.92。结论本研究提出了基于多模态超声成像数据的CLD肝纤维化、炎症和脂肪变性的智能分级诊断系统,该系统在3种CLD的智能评估中取得了较好的结果,有望推广至临床应用。
