Eu3+ activated CaWO4 was prepared by high temperature solid state reaction technique. Red afterglow was observed for in the CaWO4∶Eu after exciting with 254 nm light due to Eu3+ transition from 5D0 to 7FJ (J=0, 1, 2,...Eu3+ activated CaWO4 was prepared by high temperature solid state reaction technique. Red afterglow was observed for in the CaWO4∶Eu after exciting with 254 nm light due to Eu3+ transition from 5D0 to 7FJ (J=0, 1, 2, 3,4). By the cal culation of the thermoluminescence spectrum of CaWO4∶Eu, we conclude that there were two types of trap centers: VCa″ was formed by substitution of Ca2+ by Eu3 + and complex traps were produced because of substitution of W6+ by Eu3+.展开更多
持续数据保护(continuous data protection,CDP)是一种在不影响主要业务系统运行的前提下,可以实现持续捕捉或跟踪目标系统所发生的任何改变,并且能够恢复到此前任意时间点的方法.提出了一种新的可扩展的海量数据持续数据保护技术;设计...持续数据保护(continuous data protection,CDP)是一种在不影响主要业务系统运行的前提下,可以实现持续捕捉或跟踪目标系统所发生的任何改变,并且能够恢复到此前任意时间点的方法.提出了一种新的可扩展的海量数据持续数据保护技术;设计基于块级的海量数据持续数据保护技术的体系架构、关键技术.最后对系统性能进行了对比分析,并进行了总结和展望.展开更多
文摘Eu3+ activated CaWO4 was prepared by high temperature solid state reaction technique. Red afterglow was observed for in the CaWO4∶Eu after exciting with 254 nm light due to Eu3+ transition from 5D0 to 7FJ (J=0, 1, 2, 3,4). By the cal culation of the thermoluminescence spectrum of CaWO4∶Eu, we conclude that there were two types of trap centers: VCa″ was formed by substitution of Ca2+ by Eu3 + and complex traps were produced because of substitution of W6+ by Eu3+.
文摘持续数据保护(continuous data protection,CDP)是一种在不影响主要业务系统运行的前提下,可以实现持续捕捉或跟踪目标系统所发生的任何改变,并且能够恢复到此前任意时间点的方法.提出了一种新的可扩展的海量数据持续数据保护技术;设计基于块级的海量数据持续数据保护技术的体系架构、关键技术.最后对系统性能进行了对比分析,并进行了总结和展望.
