高速三维地形显示系统的体系结构

从自行设计的专用三维地形显示的硬件和软件系统的观点出发,讨论了高速三维地形显示系统的体系结构、关键技术及其实现方法。以新一代的高速处理器ＩＮＴＥＬｉ８６０为核心,采用分配树技术,解决多路并行输出产生的竞争和瓶颈问题;实现Ｚ－缓冲硬件算法,提高系统的图形消隐速度;设计多帧存体结构,支持多通道、多画面信息的快速显示。     

Repairable consecutive‐k‐out‐of‐n: F system with Markov dependence

In this article, a model for a repairable consecutive‐k‐out‐of‐n: F system with Markov dependence is studied. A binary vector is used to represent the system state. The failure rate of a component in the system depends on the state of the preceding component. The failure risk of a system state is then introduced. On the basis of the failure risk, a priority repair rule is adopted. Then the transition density matrix can be determined, and the analysis of the system reliability can be conducted accordingly. One example each of a linear and a circular system is then studied in detail to explain the model and methodology developed in this paper. © 2000 John Wiley & Sons, Inc. Naval Research Logistics 47: 18–39, 2000     

浅谈篮球教学中错误动作的纠正方法

篮球教学中,教师对学生在学习技、战术过程中所产生的错误,应及时、果断地采取有针对性的纠正方法.本文根据不同教学对象,不同技战术特点,及篮球教学中各因素间的关系,从纠正错误的途径、措施和手段等方面着手,对篮球教学中的错误纠正方法做了一个概括.     

京100850,北京100850,北京100850PTE

、中性单细胞凝胶电泳技术,分别比较Pten / MEFs与Pten-/-MEFs细胞中ROS、8-羟基脱氧鸟苷(8-OH-dG)水平、DNA双链断裂(DSBs)以及抗氧化能力的差异。结果:Pten-/-MEFs细胞中ROS、8-OH-dG水平明显增高,DSBs增加,抗氧化能力减弱。结论:PTEN可能通过调控细胞内ROS水平拮抗DNA氧化损伤。PTEN Deletion Leads to Increased Oxidative DNA Damage in Mouse Embryonic FibroblastsGOU Qiao