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八叉树编码体数据的快速体绘制算法 被引量:24
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作者 宋涛 欧宗瑛 +2 位作者 王瑜 李冠华 刘斌 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2005年第9期1990-1996,共7页
提出一种基于并行投影ShearWarp分解的射线模板快速RayCasting体绘制算法.体数据采用有效的八叉树存储和表达方案.八叉树的适应性均一化分级策略使得算法在简化了不必要的处理过程的同时,为构建用于RayCasting算法的射线模板和后续的交... 提出一种基于并行投影ShearWarp分解的射线模板快速RayCasting体绘制算法.体数据采用有效的八叉树存储和表达方案.八叉树的适应性均一化分级策略使得算法在简化了不必要的处理过程的同时,为构建用于RayCasting算法的射线模板和后续的交叉计算提供了有力的应用基础.针对体绘制中八叉树编码体数据构造基本的交叉运算如节点单元定位、区域定位和邻接节点单元搜索的需要,相应地提出了简单而且有效的方法.这些方法是非递归的,在减少比较运算的同时不需要构建中间结果列表,进而减少了对内存的占用和避免了繁重的交叉计算.所提出的体绘制算法能在标准PC平台下快速实现超大型数据集的处理和高质量的人体内部结构图像的绘制. 展开更多
关键词 快速体绘制 八叉树 Shear-Warp分解 射线模板
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Mesoporous CeO_2 nanowires as recycled photocatalysts 被引量:5
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作者 SHAO Yue MA Yong 《Science China Chemistry》 SCIE EI CAS 2012年第7期1303-1307,共5页
Mesoporous CeO2 nanowires(NWs) were synthesized through a facile hydrothermal process by using triblock copolymer F127 as the template.XRD analysis confirmed the cubic phase of the synthesized CeO2 NWs.High-yield one-... Mesoporous CeO2 nanowires(NWs) were synthesized through a facile hydrothermal process by using triblock copolymer F127 as the template.XRD analysis confirmed the cubic phase of the synthesized CeO2 NWs.High-yield one-dimensional NWs with accessible mesopores could be observed from SEM and TEM images,and the surface area of the material was confirmed to be 273 m2 g-1 with pore width distribution of 6.9-13.8 nm.The mesoporous CeO2 NWs could be used as efficient photocatalysts for organic dye degradation under UV light irradiation,which was superior compared with commercial photocatalyst P-25 and commercial CeO2 powders.The NW structure facilitates the recovery of catalyst by sedimentation,leading to the impressive reusability of these mesoporous CeO2 NWs. 展开更多
关键词 MESOPORE CeO2 NWs PHOTOCATALYSIS RECYCLE
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Effect of Cobalt-Doped Framework on Formation of Todorokite from Layered Manganese Oxides with Mg^(2+)/Co^(2+) Ions as Template
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作者 CUI Hao-Jie LIU Fan +1 位作者 TAN Wen-Feng FENG Xiong-Han 《Pedosphere》 SCIE CAS CSCD 2011年第6期730-737,共8页
Cobalt (Co) exists in significant quantities in naturally occurring manganese (Mn) oxides and alters the growth of Mn oxide crystals. Four-layered Mn oxides, Na-buserite (Na-bus) and three Co-doped Na-buserite s... Cobalt (Co) exists in significant quantities in naturally occurring manganese (Mn) oxides and alters the growth of Mn oxide crystals. Four-layered Mn oxides, Na-buserite (Na-bus) and three Co-doped Na-buserite samples prepared from oxidation of Mn(OH)2 with 5%, 10%, and 20% Co/(Mn + Co) molar ratios (5Co-Na-bus, 10Co-Na-bus, and 20Co-Na-bus), were used to prepare todorokite, a common Mn oxide on the Earth's surface, using Mg2+/Co2+ ions as a template. The results showed that todorokites could be obtained by reflux treatment of Mg2+-exchanged non-doped Na-buserite and three Co-doped Na-buserites at atmospheric pressure. However, the formation of todorokites was prohibited by reflux treatment of Co2+-exchanged Na-bus, 5Co-Na-bus, and 10Co-Na-bus samples. Instead, todorokite was obtained by the reflux treatment of Co2+-exchanged 20Co-Na-bus samples under atmospheric pressure. X-ray photoelectron spectroscopy analysis showed that doped Co existed as Co3+ in the MnOs layers of doped Na-buserites. The amount of substituted Co3+ in the MnO6 layers may play a key role in the conversion of buserite to todorokite using Co2+ ions as a template. 展开更多
关键词 Mn oxide Na-buserite reflux treatment transformation tunnel structure
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