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The work described in this paper,by adopting a parameterized adaptive meshing image reconstruction method to yield the interface between the two layered phases, aims to improve the existing static mesh based ERT measurement accuracy for a stratified two phase flow within a closed pipe, assuming that the phase interface is of a distinctive nature or its fuzziness in the boundary region omittable.

电阻层析成像技术是一种非常有潜力的两相流/多相流检测技术,可实现对封闭管道或者过程容器设备内部多相组分物质参数的可视化测量,具有非侵入、响应速度快、成本低、安全性能好、适用范围广等优点,适用于两相流/多相流中以液相为连续相的生产过程。

Moreover regardless of adopts what kind of existence the existent solution, digit imaging system's latitude must be a certain that cannot be intervened artificially value on the physical level after leaving factory. Some digital cameras are known as alterable latitude, but they change camera's latitude by past treatment through DSP. So users cannot change latitude, light-shade transition or color transition as film camera just by replacing film's type. Now the civil camera's minimum ISO is 50. This value is discommodity for users to photo by the long exposure or other similar mode.

另外无论采取何种目前存在的解决方案,由于目前具有动态范围可调功能的数字照相机都是针对CCD所采集的数据进行再处理,因此,数字成像系统物理层上的宽容度动态范围始终是一个人工不可干预的固定值,这样的话,用户无法像胶片一样仅仅改变胶片型号便能实现宽容度和色彩过渡的改变以方便画面的创意,而且目前民用照相机感光度的最低值一般为ISO50,这个值在进行类似长曝光等方式的创意摄影时仍存在较大的不便之处。

The main research work of this paper are focused on following areas:(1) Based on review of the theory and methods on measurements of particle fields, a new idea for obtaining particle size and velocity distribution within a spray through imaging the particle field with a laser light sheet was put forward;(2) A DPIV (Digital Particle Image Velocimetry) system, is fit for velocity measurements of low speed flows, was developed and expended to particle size distribution measurement;(3) An arithmetic for particle velocity field reconstruction was developed, and the velocity distribution of water mist was also obtained;(4) A software system for particle analysis, which based on image geometry emend, de-noise and image partition was developed, the parameters such as particle size distribution, mean diameter, number of particles, minimum and maximum diameter can be got with this system;(5) A water mist system was developed and its characteristics, such as droplet velocity, size distribution, number of droplets and spray cone angle under different conditions were obtained from experiments with PIVS;(6) The measurement results of water mist characteristics with PIVS were compared and analyzed with the simply simulated results, and in addition, in order to verify the accuracy of PIVS, some experiments were conducted with the standard particles, such as glass-ball with known mean diameter of 50μm and 115μm, metallic coated tracing particle with mean diameter of 12μm;(7) Some experimental studies on interaction of water mist with liquid pool fires were conducted.

本论文的主要工作包括以下几个方面:(1)在对粒子场测量的相关理论和具体方法进行综述分析的基础上,提出了通过采用激光片光对粒子场进行成像以获取其粒径和速度等参数分布的新思路;(2)研制了适宜于低速流动速度场测量的DPIV(Digital Particle Image Velocimetry)系统,并使其实现了对粒子场粒径分布的测量功能;(3)研制了基于粒子运动轨迹的速度场重建算法,获取了细水雾雾场的速度分布;(4)研制了基于几何校正、去噪、图象分割等图象处理方法的"粒度分析软件系统",该系统既可分析给出粒子场的粒径分布直方图和平均粒径,还可给出粒子的数目以及最大、最小粒径等信息;(5)建立了一细水雾发生系统,并应用上述方法对不同压力条件下细水雾系统的雾场特性(如速度分布、雾滴粒径分布、雾滴的数目、喷雾张角以及雾化长度等)进行了实验测量研究;(6)对细水雾特性参数的PIVS测量结果与计算机简单模拟计算结果进行了定性比较分析,并利用平均粒径为50μm和115μm的玻璃球以及12μm的标准示踪粒子对PIVS系统的粒径和速度测量结果进行了实验验证,同时对其局限性进行了分析讨论;(7)对不同工况条件下细水雾与油池火相互作用的过程进行了模拟实验研究。

This method combined the traceroute result with the topology information obtained by tomography to construct a final topology using minimum similarity cluster algorithm and merging and constructing anonymous routers algorithm.the simulation on ns2 shows that this method not only be able to infer the network topology which contains uncooperative routers, but also enormously reduce the number of probes.

该方法可通过提出的最小相似度聚类算法和匿名节点构造归并算法,将网络层析成像获得的拓扑信息与traceroute探测结果融合,构成最终的拓扑结构。ns2的仿真表明,该方法不仅可识别包含不协作节点的网络拓扑,且所使用的探测包的数量也大大减少。

Results and Conclusions: As the recently developed international bio-visual micro-analysis method, QDs technology is the development and extension of this method. QDs technology has advantages in bio-labling, active cell and corporeal imaging, medical research, bio-chip fluorescent labels and screen.

结果与结论: QDs技术是近年来国际生物可视化微分析方法为代表的可视化分析微技术的发展和延伸,它在生物标记、活细胞和体内成像、药物研究、生物芯片的荧光标记与筛选研究等方面具有独特优势。

Second, the theory of scale space was used to design a new operator for target detection and tracking. Then, the property of scale invariant was analyzed and proved, and a tracking scheme based on the gradient LOG operator was proposed. Experimental results show that the gradient LOG operator is appropriate to describe small target in complex background, and the detection precision is in the level of sub-pixel. Furthermore, it is efficient and robust to noise.

然后根据尺度空间的基本理论构造了一种针对该成像模型的目标检测算子,分析并证明了该算子具有尺度不变性的优点,设计并实现了基于梯度LOG算子的小目标跟踪方案,实验结果表明:梯度LOG算子能够较好地跟踪复杂背景中的光团目标,定位精度可达亚像素级,且具有计算量小,抭嗓声能力强等优点。

Second, the theory of scale space was used to design a new operator for target detection and tracking. Then, the property of scale invariant was analyzed and proved, and a tracking scheme based on the gradient LOG operator was proposed. Experimental results show that the gradient LOG operator is appropriate to describe small target in complex background, and the detection precision is in the level of sub-pixel.

然后根据尺度空间的基本理论构造了一种针对该成像模型的目标检测算子,分析并证明了该算子具有尺度不变性的优点,设计并实现了基于梯度LOG 算子的小目标跟踪方案,实验结果表明:梯度LOG 算子能够较好地跟踪复杂背景中的光团目标,定位精度可达亚像素级,且具有计算量小,抗噪声能力强等优点。

Researchers have created a new imaging compound in mice that selectively binds to certain cancer cells and glows, or fluoresces, only when processed by these cells.

忘记账号、密码、安全问题?研究人员发明了一种可在小鼠中选择性结合被某种癌细胞处理的,可发光或者说发荧光的成像化合物。

Stens were evaluated to be patent, while 1 stent was not patent. Conclusion: Sixteen slice spiral CT scan of the cardiac coronary artery is a noninvasive,simple and good method. Coronary calcium score and coronary artery stenosis can be evaluated within one study. The patency of stents could also be evaluated. But more experience in more cases of comparative study should be obtained to prove the accuracy of the evaluation of stenosis of coronary arteries and patency of stents.

十六层螺旋CT冠状动脉CT动脉造影(CTA,computer tomography angiography)是一种无创、简便、优良的冠状动脉成像方法,可一次检查完成冠状动脉钙化积分和狭窄评价,也可评价支架通畅情况,但其评价狭窄及支架通畅的准确性有待做更多病例的CTA与常规冠状动脉造影的对照研究。

Considering the contributions due to viewed cone centred on the object point and extending through the luminnor body, the distribution of intensity in the image plane can be expressed by the integration of emitted powers of luminor body over the entire sightline under the paraxial approximation.

考虑到成像光锥的贡献,在近轴近似下,得到了用发光体的辐射强度表示像平面上照度分布的积分表达式,由此得到下列结果:1沿光路上每一垂直于光路的平面上能量贡献是一样的。2由于光路积分,探测器测到的光强涨落的幅度小于实际的涨落幅度,但在一定的条件下,发光体的涨落图像可重现。

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但我们并不在乎沙场中的显露。

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啊!不用提了。提到肉,真是糟透了。

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