This paper has systematically investigated the substrate temperature and thickness dependence of surface morphology and magnetic property of CrAs compound films grown on GaAs by molecular-beam epitaxy. It finds that t...This paper has systematically investigated the substrate temperature and thickness dependence of surface morphology and magnetic property of CrAs compound films grown on GaAs by molecular-beam epitaxy. It finds that the substrate temperature affects the surface morphology and magnetic property of CrAs thin film more potently than the thickness.展开更多
目的调查临床监查员(clinical research associate,CRA)对上海市医院临床试验服务的满意度,以提升临床试验服务质量。方法2023年10—11月采用典型调查方法和修订的SERVQUAL(service quality)量表对CRA进行问卷调查,内容包括保证性、可...目的调查临床监查员(clinical research associate,CRA)对上海市医院临床试验服务的满意度,以提升临床试验服务质量。方法2023年10—11月采用典型调查方法和修订的SERVQUAL(service quality)量表对CRA进行问卷调查,内容包括保证性、可靠性、有形性、响应性及移情性等5个维度29个条目。根据修正的服务重要性绩效满意度分析(importance-performance analysis,IPA)明确落入改进区的条目。结果对于来自10家申办者及其委托机构的163名CRA进行问卷调查,回收有效问卷160份。根据修正的IPA象限图,保证性、可靠性、有形性、响应性及移情性维度落入改进区的条目分别为6、2、1、2和2条。结论CRA对上海市医院的临床试验服务可能未达到满意水平,临床试验机构可从规范化意识、审查模式、流程获取、答复响应、管理体系灵活性等方面进行优化,从而提高临床试验服务质量。展开更多
High quality single crystal CrAs was grown by Sn flux method.The results of magnetic susceptibility and electrical resistivity are reported in a temperature range of 2 to 800 K.At low temperatures,a T2 dependence of r...High quality single crystal CrAs was grown by Sn flux method.The results of magnetic susceptibility and electrical resistivity are reported in a temperature range of 2 to 800 K.At low temperatures,a T2 dependence of resistivity is observed showing a Fermi-liquid behavior.The Kadowaki-Woods ratio is found to be 1×10-5 μΩ cm mol2 K2 mJ-2,which fits well to the universal value for many correlated electron systems.At about 270 K,a clear magnetic transition is observed with sharp changes of resistivity and susceptibility.Above 270 K,a linear-temperature dependence of the magnetic susceptibility is observed up to 700 K,which resembles the T-dependent magnetic susceptibility of parents of iron-pnictides superconductors.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant Nos 10334030, 10425419 and 60521001）. Acknowledgments The authors acknowledge Professor Z.C. Niu, Professor F.H. Yang and Professor H.Z. Zheng for useful discussion.
文摘This paper has systematically investigated the substrate temperature and thickness dependence of surface morphology and magnetic property of CrAs compound films grown on GaAs by molecular-beam epitaxy. It finds that the substrate temperature affects the surface morphology and magnetic property of CrAs thin film more potently than the thickness.
文摘目的调查临床监查员(clinical research associate,CRA)对上海市医院临床试验服务的满意度,以提升临床试验服务质量。方法2023年10—11月采用典型调查方法和修订的SERVQUAL(service quality)量表对CRA进行问卷调查,内容包括保证性、可靠性、有形性、响应性及移情性等5个维度29个条目。根据修正的服务重要性绩效满意度分析(importance-performance analysis,IPA)明确落入改进区的条目。结果对于来自10家申办者及其委托机构的163名CRA进行问卷调查,回收有效问卷160份。根据修正的IPA象限图,保证性、可靠性、有形性、响应性及移情性维度落入改进区的条目分别为6、2、1、2和2条。结论CRA对上海市医院的临床试验服务可能未达到满意水平,临床试验机构可从规范化意识、审查模式、流程获取、答复响应、管理体系灵活性等方面进行优化,从而提高临床试验服务质量。
基金supported by the National Natural Science Foundation of China,the Knowledge Innovation Project of Chinese Academy of Sciencesthe 973 Project of the MOST of China
文摘High quality single crystal CrAs was grown by Sn flux method.The results of magnetic susceptibility and electrical resistivity are reported in a temperature range of 2 to 800 K.At low temperatures,a T2 dependence of resistivity is observed showing a Fermi-liquid behavior.The Kadowaki-Woods ratio is found to be 1×10-5 μΩ cm mol2 K2 mJ-2,which fits well to the universal value for many correlated electron systems.At about 270 K,a clear magnetic transition is observed with sharp changes of resistivity and susceptibility.Above 270 K,a linear-temperature dependence of the magnetic susceptibility is observed up to 700 K,which resembles the T-dependent magnetic susceptibility of parents of iron-pnictides superconductors.
