Direct simulation of 3-D MHD(magnetohydrodynamics) flows in liquid metal fusion blanket with flow channel insert(FCI) has been conducted.Two kinds of pressure equilibrium slot (PES) in FCI,which are used to balance th...Direct simulation of 3-D MHD(magnetohydrodynamics) flows in liquid metal fusion blanket with flow channel insert(FCI) has been conducted.Two kinds of pressure equilibrium slot (PES) in FCI,which are used to balance the pressure difference between the inside and outside of FCI,are considered with a slot in Hartmann wall or a slot in side wall,respectively.The velocity and pressure distribution of FCI made of SiC/SiC_f are numerically studied to illustrate the 3-D MHD flow effects,which clearly show that the flows in fusion blanket with FCI are typical three-dimensional issues and the assumption of 2-D fully developed flows is not the real physical problem of the MHD flows in dual-coolant liquid metal fusion blanket.The optimum opening location of PES has been analyzed based on the 3-D pressure and velocity distributions.展开更多
在XML查询中,为了快速判断节点之间祖先后裔关系和双亲孩子关系,提出了一些编码方案,然而,当对顺序敏感的有序XML文档进行插入更新操作的时候,现有的编码方案必须重新对存在的节点进行编码或者重新计算节点编码的值,导致了很高的更新代...在XML查询中,为了快速判断节点之间祖先后裔关系和双亲孩子关系,提出了一些编码方案,然而,当对顺序敏感的有序XML文档进行插入更新操作的时候,现有的编码方案必须重新对存在的节点进行编码或者重新计算节点编码的值,导致了很高的更新代价。在路径编码方法的基础上,提出了一种新的编码方案BSEPS(Binary String Encoding based on Path Scheme),该方案支持在不重新编码或者重新计算的情况下完成顺序敏感的插入更新操作。实验结果表明,BSEPS编码能有效处理顺序敏感查询和叶节点/子树更新。展开更多
作为一种能满足特定场景监控需求的网络覆盖类型,Sweep Coverage能够通过使用较少的节点来完成对Points of Interest(POI)的覆盖.为了改进以前的Sweep Coverage机制在覆盖间隔相差较大时的性能,本文提出了一种新的考虑了路径增量与覆盖...作为一种能满足特定场景监控需求的网络覆盖类型,Sweep Coverage能够通过使用较少的节点来完成对Points of Interest(POI)的覆盖.为了改进以前的Sweep Coverage机制在覆盖间隔相差较大时的性能,本文提出了一种新的考虑了路径增量与覆盖间隔差异的插入启发式(Coverage Different Insert Heuristic)CDIH算法.实验结果表明,在相同的网络监控场景中,新的启发式算法较以往的覆盖机制均能有较好的表现.展开更多
基金supported by National Natural Science Foundation of China with grant Nos.10872212,50936006National Magnetic Confinement Fusion Science Program in China with grant No.2009GB10401
文摘Direct simulation of 3-D MHD(magnetohydrodynamics) flows in liquid metal fusion blanket with flow channel insert(FCI) has been conducted.Two kinds of pressure equilibrium slot (PES) in FCI,which are used to balance the pressure difference between the inside and outside of FCI,are considered with a slot in Hartmann wall or a slot in side wall,respectively.The velocity and pressure distribution of FCI made of SiC/SiC_f are numerically studied to illustrate the 3-D MHD flow effects,which clearly show that the flows in fusion blanket with FCI are typical three-dimensional issues and the assumption of 2-D fully developed flows is not the real physical problem of the MHD flows in dual-coolant liquid metal fusion blanket.The optimum opening location of PES has been analyzed based on the 3-D pressure and velocity distributions.
文摘在XML查询中,为了快速判断节点之间祖先后裔关系和双亲孩子关系,提出了一些编码方案,然而,当对顺序敏感的有序XML文档进行插入更新操作的时候,现有的编码方案必须重新对存在的节点进行编码或者重新计算节点编码的值,导致了很高的更新代价。在路径编码方法的基础上,提出了一种新的编码方案BSEPS(Binary String Encoding based on Path Scheme),该方案支持在不重新编码或者重新计算的情况下完成顺序敏感的插入更新操作。实验结果表明,BSEPS编码能有效处理顺序敏感查询和叶节点/子树更新。
文摘作为一种能满足特定场景监控需求的网络覆盖类型,Sweep Coverage能够通过使用较少的节点来完成对Points of Interest(POI)的覆盖.为了改进以前的Sweep Coverage机制在覆盖间隔相差较大时的性能,本文提出了一种新的考虑了路径增量与覆盖间隔差异的插入启发式(Coverage Different Insert Heuristic)CDIH算法.实验结果表明,在相同的网络监控场景中,新的启发式算法较以往的覆盖机制均能有较好的表现.
