Influence of O/Ar ratio on the properties of NiO thin film grown with the method of radio-frequency magnetron sputtering

In order to obtain high quality NiO thin film grown with the radio-frequency magnetron sputtering method, the influence of O/Ar ratio on the structure, band-gap, resistivity and optical transmittance of NiO thin films were studied. It was found that the obtained NiO thin film showed (111) preferred orientation and higher transparency in the visible region. With the increasing of O/Ar ratio from 1∶7 to 8∶2, the optical transmittance of NiO thin films decreased and the optical band-gap was between 3.4 eV and 3.7 eV, and the sheet resistivity decreased from 5.4×107 Ω/□ to 1.0 ×105 Ω/□. Our study shows that the properties of NiO thin films can be adjusted in a wide range by adjusting the O/Ar ratio in the sputtering process.     

蓝鲸高可用服务部署系统的研究与设计

基于网络存储的特点造成蓝鲸服务部署系统的可用性从根本上依赖于存储服务系统的可用性。该文设计了为客户机提供高可用服务、针对各部件采用不同冗余机制的蓝鲸高可用服务部署系统。对高可用系统的可用性进行了评估。结果表明,与原服务部署系统相比,该系统拥有更高的可用性等级。     

基于服务部署的高可用模型及其可用性分配算法

传统高可用系统存在可扩展性较差的问题.文中提出基于服务部署的高可用系统模型,利用对计算资源与存储资源的分离管理实现虚拟高可用服务节点,通过不同服务间共享冗余资源提高资源利用率,有效解决可扩展性问题.基于服务部署高可用系统的关键问题为如何根据服务可用性期望值和使用模式等合理分配资源.针对本系统可用性分配特点,文中提出了最适合冗余优先分配算法,基于结合费用与惩罚值的目标函数得到满足需求的相对最优解,实验证明此算法能较好地达到系统的实时服务部署要求.