排序方式: 共有80条查询结果,搜索用时 15 毫秒
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虚拟和真实实验相融合的三维非完全数据层析 总被引:11,自引:6,他引:5
为了解决非完全数据条件下复杂流场的三维层析重建,结合计算流体力学(Computational fluid dynamics,CFD)、计算流动显示技术(Computational flo wimaging,CFI)和光学层析技术(Optical computerized tomography,OCT),提出了应用于非完全数据流场重建的虚拟实验和真实实验相融合(即CFD,CFI与OCT融合)的三维层析。非对称双峰温度场实验结果表明,与完全数据重建结果相比,虚拟实验与真实实验相融合的三维层析的重建双峰误差小于5%。因此能够更好地实现非完全数据条件下流场的三维重建,极大地提高非完全数据条件下流场重建的真实性,较好地与实际结果相吻合,从而为解决有限角条件下的严重非完全数据流场的重建开拓了一条新途径。 相似文献
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In this paper,argon arc plasma is chosen as an example to study the absorption characteristics of arc plasma in the infrared region.Firstly,the phase and the attenuation constants are deduced for the given temperature,pressure and probe wavelength regions.Based on those constants,the dependence of the attenuation constant on the temperature and pressure in the vicinity of a certain probe wavelength is found.Then,theoretical analysis and discussion are conducted.Maximal absorption occurs at the position where the contributions of neutral particles and electrons come to a balance in a physical point of view,which may provide some measures to take for decreasing or controlling the plasma absorption of electromagnetic waves. 相似文献
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Flow cytometry is widely used in cell counting, cell sorting, biomarker detection and protein engineer- ing. In a traditional flow cytometry, the forward light scattering exhibits the cell size and the orthogonal light scattering provides additional information on the structures of the cells. Each type of cell in the im- mune system has a unique combination of forward and orthogonal scatter measurements, allowing us to count the number of each type of cells. Salzman et al. have shown that human lymphocytes, monocytes, and granulocytes can be distinguished in unstained blood cells by light scattering measurements, mainly due to differences in orthogonal light scattering. Picking out the slightest difference of orthogonal light scattering is very important to increase measurement precision. 相似文献
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Al等离子体特征辐射时间分辨谱线线形分析 总被引:2,自引:1,他引:1
用Nd :YAG脉冲激光烧蚀Al靶获得Al等离子体 ,利用时 空分辨技术采集Al等离子体的辐射信息 ,记录了 10~ 10 0 0 0ns延迟范围内Al等离子体辐射的时间分辨谱 ,通过分析 ,获得了Al等离子体特征谱线AlⅠ 396 15和AlⅠ 394 4 0nm的时间分辨谱。分析了 80 0~ 10 0 0 0ns延迟范围内的谱线线形 ,并分别对两条特征谱线进行了Lorentz函数和Gauss函数拟合。结果发现 ,10 0 0ns延迟以后的谱线是非常规则的Lorentz线形 ;而 10 0 0ns以前的也是Lorentz线形 ,但不十分规则 ;在该延迟范围内 ,所有时间分辨特征谱线与Gauss拟合曲线相差很大 ,说明谱线不是Gauss线形的。参照Lorentz函数拟合结果 ,测量了这两条谱线的半高全宽 ,并与谱线的自然线宽理论值比较。结果发现 ,实验值远大于理论值 相似文献
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针对光学计算机层析术(Optical Computerized Tomography,OCT)中有限角条件下的严重非完全数据重建问题,提出了正交投影采样,结合基于改进的代数重建术(ART)的先验知识算法,以在尽可能少的投影方向数下较好地重建含遮挡物的三维流场。通过计算机模拟,详细讨论了在有限角条件下含遮挡物的三维流场的非完全数据重建精度及误差分析。结果表明,在有限角及含遮挡物条件下,采用正交投影采样可以极大地减少严重非完全数据重建中的误差,提高重建精度,从而为将光学计算机层析术应用于非完全数据的实测中提供了参考。 相似文献
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