The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron mi...The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology.展开更多
Efficient Mukaiyama-type aldol reaction of 1, 2-bis(trimethylsiloxy)cyclobutene with aromatic aldehydes catalyzed by MgI2 is reported. The resulting succinoylation product of aldehyde was converted into the synthetic...Efficient Mukaiyama-type aldol reaction of 1, 2-bis(trimethylsiloxy)cyclobutene with aromatic aldehydes catalyzed by MgI2 is reported. The resulting succinoylation product of aldehyde was converted into the synthetic useful g-lactone and butenolide derivatives.展开更多
目的评估五种临床介入程序中,职业人员眼晶状体所受辐射剂量水平。方法选择四家医院进行五种介入程序实验,将光致发光剂量计(OSL,材料Al2O3:C)分别佩戴在介入职业人员的眼睛附近,记录治疗过程中透视时间、累积剂量和剂量面积乘积(DAP,Do...目的评估五种临床介入程序中,职业人员眼晶状体所受辐射剂量水平。方法选择四家医院进行五种介入程序实验,将光致发光剂量计(OSL,材料Al2O3:C)分别佩戴在介入职业人员的眼睛附近,记录治疗过程中透视时间、累积剂量和剂量面积乘积(DAP,Dose-Areas Product)等参数,测量用所得的个人剂量当量Hp(0.07)值估算不同程序治疗过程中不同术者的左眼,右眼以及两眼中间的眼晶状体剂量,并与治疗过程的记录值做统计学分析。结果统计计算介入职业人员眼晶状体剂量,五种介入程序-冠状动脉造影(CA,Coronary Angiography)、冠状动脉成形术+植入术(PTCA+PCI,Percutaneous Transluminal Coronary Angioplasty and Percutaneous Coronary Intervention)、脑动脉瘤、心脏起搏器、心脏射频消融,年平均当量剂量分别为15.12、11.59、8.64、36.10、12.78 m Sv。其中操作者在做起搏器治疗时眼晶状体受辐射剂量最高。结论职业人员在起搏器治疗时所受剂量超过国际放射防护委员会(ICRP)最新推荐的眼晶状体剂量限值(20 m Sv)。同时通过统计学分析得,不同的治疗类型、透视时间、累积剂量、DAP,职业人员的眼晶状体剂量也不同。因此,介入职业人员应尽量减少操作时间,加强对眼晶状体的防护。展开更多
基金This work was supported by the National Natural Science Foundation of China.
文摘The metastable phase 3c-Fe7S8 with the hexagonal platelet morphology has been prepared by using solvothermal route. The product was characterized by means of X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). The experiment results show that the as-prepared Fe7S8 is a metastable phase with the hexagonal platelet morphology.
基金We are grateful for the financial supports from the National Outstanding Youth Fund (No. 29925204) the Foundation for University Key Teacher by the Ministry of Education of China and a Visiting Fund of the National Laboratory of Applied Organic Chem
文摘Efficient Mukaiyama-type aldol reaction of 1, 2-bis(trimethylsiloxy)cyclobutene with aromatic aldehydes catalyzed by MgI2 is reported. The resulting succinoylation product of aldehyde was converted into the synthetic useful g-lactone and butenolide derivatives.
文摘目的评估五种临床介入程序中,职业人员眼晶状体所受辐射剂量水平。方法选择四家医院进行五种介入程序实验,将光致发光剂量计(OSL,材料Al2O3:C)分别佩戴在介入职业人员的眼睛附近,记录治疗过程中透视时间、累积剂量和剂量面积乘积(DAP,Dose-Areas Product)等参数,测量用所得的个人剂量当量Hp(0.07)值估算不同程序治疗过程中不同术者的左眼,右眼以及两眼中间的眼晶状体剂量,并与治疗过程的记录值做统计学分析。结果统计计算介入职业人员眼晶状体剂量,五种介入程序-冠状动脉造影(CA,Coronary Angiography)、冠状动脉成形术+植入术(PTCA+PCI,Percutaneous Transluminal Coronary Angioplasty and Percutaneous Coronary Intervention)、脑动脉瘤、心脏起搏器、心脏射频消融,年平均当量剂量分别为15.12、11.59、8.64、36.10、12.78 m Sv。其中操作者在做起搏器治疗时眼晶状体受辐射剂量最高。结论职业人员在起搏器治疗时所受剂量超过国际放射防护委员会(ICRP)最新推荐的眼晶状体剂量限值(20 m Sv)。同时通过统计学分析得,不同的治疗类型、透视时间、累积剂量、DAP,职业人员的眼晶状体剂量也不同。因此,介入职业人员应尽量减少操作时间,加强对眼晶状体的防护。
