The typical magnetic domains of Sm（CObalFe0.25Cuo.07Zr0.02）7.4 magnets quenched through various heattreatment steps have been revealed by using magnetic force microscopy （MFM）. For the specimens in which the nomin...The typical magnetic domains of Sm（CObalFe0.25Cuo.07Zr0.02）7.4 magnets quenched through various heattreatment steps have been revealed by using magnetic force microscopy （MFM）. For the specimens in which the nominal c-axis is perpendicular to the imaging plane, the domain configurations change from plate-like for the as-sintered magnet to corrugation and spike-like for the homogenized one, and then to a coarse and finally to a finer domain structure when isothermally aged at 830℃ and then annealed at 400℃. However, only plate-like domains can be detected on the surfaces with the nominal c-axis parallel to the imaging plane. The finer domain （so-called interaction domain） is a characteristic magnetic domain pattern of the SmCo 2：IT-type magnets with high coercivities. Domain walls in a zigzag shape are revealed by means of MFM in final bulk SraCo 2：17-type sintered magnets.展开更多
提出了一种基于PIM-SM的新的扩展协议EPIM-SM(extend to PIM-SM)。该协议采用了一种新的算法代替PIM-SM用于RP选举的哈希算法,新协议提供这样一种机制:根据网络拓扑结构及组播源和成员的变化情况,为每个候选RPi估算其组播树整体代价,定...提出了一种基于PIM-SM的新的扩展协议EPIM-SM(extend to PIM-SM)。该协议采用了一种新的算法代替PIM-SM用于RP选举的哈希算法,新协议提供这样一种机制:根据网络拓扑结构及组播源和成员的变化情况,为每个候选RPi估算其组播树整体代价,定期选择一个代价值最小的RP,以使组播树的代价始终保持接近最低。展开更多
脊髓性肌萎缩症（spinal muscular atrophy，SMA）是一类与运动神经元存活基因（survival of motor neurons gene，SMN gene）突变有关的神经系统变性疾病，而SMN基因的转录产物即为SMN蛋白（survival of motorneurons protein，SMN pro...脊髓性肌萎缩症（spinal muscular atrophy，SMA）是一类与运动神经元存活基因（survival of motor neurons gene，SMN gene）突变有关的神经系统变性疾病，而SMN基因的转录产物即为SMN蛋白（survival of motorneurons protein，SMN protein）。SMN蛋白与多种蛋白结合后发挥作用，如SMN-Sm蛋白的相互作用在富含尿嘧啶的小核核糖核蛋白体（uridine—richsmallribonucleo—proteins，UsnRNPs）转运装配中有重要意义。SMN蛋白是通过其Tudor结构域与剪接体sm蛋白的二甲基化修饰的富含精氨酸一氨基乙酸域（ar—ginineandglycine—rich，RG）结合。展开更多
基金Project supported by the Beijing Municipal Science and Technology Committee Key Project, China (Grant No D0406002000091)the National Natural Science Foundation of China (Grant No 10374110)
文摘The typical magnetic domains of Sm（CObalFe0.25Cuo.07Zr0.02）7.4 magnets quenched through various heattreatment steps have been revealed by using magnetic force microscopy （MFM）. For the specimens in which the nominal c-axis is perpendicular to the imaging plane, the domain configurations change from plate-like for the as-sintered magnet to corrugation and spike-like for the homogenized one, and then to a coarse and finally to a finer domain structure when isothermally aged at 830℃ and then annealed at 400℃. However, only plate-like domains can be detected on the surfaces with the nominal c-axis parallel to the imaging plane. The finer domain （so-called interaction domain） is a characteristic magnetic domain pattern of the SmCo 2：IT-type magnets with high coercivities. Domain walls in a zigzag shape are revealed by means of MFM in final bulk SraCo 2：17-type sintered magnets.
文摘提出了一种基于PIM-SM的新的扩展协议EPIM-SM(extend to PIM-SM)。该协议采用了一种新的算法代替PIM-SM用于RP选举的哈希算法,新协议提供这样一种机制:根据网络拓扑结构及组播源和成员的变化情况,为每个候选RPi估算其组播树整体代价,定期选择一个代价值最小的RP,以使组播树的代价始终保持接近最低。
文摘脊髓性肌萎缩症（spinal muscular atrophy，SMA）是一类与运动神经元存活基因（survival of motor neurons gene，SMN gene）突变有关的神经系统变性疾病，而SMN基因的转录产物即为SMN蛋白（survival of motorneurons protein，SMN protein）。SMN蛋白与多种蛋白结合后发挥作用，如SMN-Sm蛋白的相互作用在富含尿嘧啶的小核核糖核蛋白体（uridine—richsmallribonucleo—proteins，UsnRNPs）转运装配中有重要意义。SMN蛋白是通过其Tudor结构域与剪接体sm蛋白的二甲基化修饰的富含精氨酸一氨基乙酸域（ar—ginineandglycine—rich，RG）结合。
