在Muquit M A等提出基于相位相关的三维重建算法的基础上提出改进,对图像进行细节恢复的前处理;利用各个匹配等级之间的结构相关性进行搜索限制;在每个匹配等级下都进行畸点的识别和重定位;对匹配结果进行限制深度的三维模型优化处理....在Muquit M A等提出基于相位相关的三维重建算法的基础上提出改进,对图像进行细节恢复的前处理;利用各个匹配等级之间的结构相关性进行搜索限制;在每个匹配等级下都进行畸点的识别和重定位;对匹配结果进行限制深度的三维模型优化处理.实验结果表明,提出的改进算法比原始算法的三维重建性能有明显提升.展开更多
扫描离子电导显微镜(scanning ion conductance microscopy,SICM)是一种非接触式的扫描探针显微技术(scanning probe microscopy,SPM),可以实现生物样品在近生理条件下的成像。随着技术发展,目前广泛应用于生物医学领域的SICM主要包括两...扫描离子电导显微镜(scanning ion conductance microscopy,SICM)是一种非接触式的扫描探针显微技术(scanning probe microscopy,SPM),可以实现生物样品在近生理条件下的成像。随着技术发展,目前广泛应用于生物医学领域的SICM主要包括两种:跳跃式离子电导显微技术(hopping probe ion conductance microscopy,HPICM)和外加压力模式的SICM。前者可以应用于软的、黏的、对外力或其它机械信号敏感的样品的高分辨成像;后者可以通过探针微管对样品局部施加外力刺激或化学、电学、光学或生物分子等信号,实现对样品动力学性质或相关生理过程局部的原位研究。此外,SICM技术具有良好的开放性,能够越来越多地与其它技术手段联用,极大地丰富了其在生物医学领域的应用,可用于疾病发病机理、药物作用以及临床诊断等的研究。但是,目前SICM时间分辨率较低,这制约了它在生物体系动力学行为方面的研究。展开更多
Effect of the carbon nanotube （CNT） channel length on the water flow through the CNT is studied using molecular dynamics simulations. The water flow is found to decay with the channel length （-1/N^2.3, N is the num...Effect of the carbon nanotube （CNT） channel length on the water flow through the CNT is studied using molecular dynamics simulations. The water flow is found to decay with the channel length （-1/N^2.3, N is the number of carbon rings along the nanotube axis）, much faster than that predicted by a previous continuous-time random walk （CTRW） model （-1/N）. This unexpected decay rate of flow is found to result from the weakening of the correlation of the concerted motion of the water molecules inside the ONT. An improved CTRW model is then proposed by taking into account of this effect. Meanwhile, the diffusion constant of water molecules inside CNTs with various lengths is found to be relatively invariant, which results in a relatively constant hopping rate.展开更多
文摘扫描离子电导显微镜(scanning ion conductance microscopy,SICM)是一种非接触式的扫描探针显微技术(scanning probe microscopy,SPM),可以实现生物样品在近生理条件下的成像。随着技术发展,目前广泛应用于生物医学领域的SICM主要包括两种:跳跃式离子电导显微技术(hopping probe ion conductance microscopy,HPICM)和外加压力模式的SICM。前者可以应用于软的、黏的、对外力或其它机械信号敏感的样品的高分辨成像;后者可以通过探针微管对样品局部施加外力刺激或化学、电学、光学或生物分子等信号,实现对样品动力学性质或相关生理过程局部的原位研究。此外,SICM技术具有良好的开放性,能够越来越多地与其它技术手段联用,极大地丰富了其在生物医学领域的应用,可用于疾病发病机理、药物作用以及临床诊断等的研究。但是,目前SICM时间分辨率较低,这制约了它在生物体系动力学行为方面的研究。
基金Supported by the National Natural Science Foundation of China under Grant Nos 10474109 and 10674146.
文摘Effect of the carbon nanotube （CNT） channel length on the water flow through the CNT is studied using molecular dynamics simulations. The water flow is found to decay with the channel length （-1/N^2.3, N is the number of carbon rings along the nanotube axis）, much faster than that predicted by a previous continuous-time random walk （CTRW） model （-1/N）. This unexpected decay rate of flow is found to result from the weakening of the correlation of the concerted motion of the water molecules inside the ONT. An improved CTRW model is then proposed by taking into account of this effect. Meanwhile, the diffusion constant of water molecules inside CNTs with various lengths is found to be relatively invariant, which results in a relatively constant hopping rate.
基金Supported by the 100 Persons Project of the Chinese Academy of Sciences, the National Natural Science Foundation of China under Grant Nos 10474109 and 10674146, the National Basic Research Programme of China under Grant Nos 2006CB933000 and 2006CB708612. To whom correspondence should be addressed.
