参数变换

We present the forward and inverse transform formulas and discuss how to choose the best parameters to avoid aliasing.

讨论了多项式正反Radon变换的公式、实现方法和有关计算参数的选择。

To avoid the "crowding phenomenon" in conformal mapping,approximate analytical expressions of characteristic parameter for CPW′s on a thin substrate have been derived.

本文推导出了薄衬底共面波导特性参数计算的近似解析表达式，避免了薄衬底保角变换中的"拥挤现象"。

For general engineering problems, the analytical transformation rules are sufficiently accurate to design the similar cascade profile, but further improvement of the precision is limited by the one-dimensional assumption of the transformation, therefore an inverse blade design method—influence matrix method, based upon the surface vorticity model, is developed to improve the precision effectively.

进一步讨论了在具有相同表面压力系数分布的情形下，进口马赫数对附面层发展的影响，发现在一定条件下，只要表面压力系数的分布相似，则叶面附面层发展情况及无量纲气动力参数也将存在相同精度的相似，这一结论使我们在进行相似流场模拟的模型设计中，得以只进行无粘流场之间的相似变换，从而大大减少相似模型设计的工作量和复杂性。

Then angular motion compensation and Radon transformation are performed to the ISAR image. A novel search algorithm based on the edge detection is used to divide the target from the sea clutter in the end.

利用ISAR技术得到回波二维像，差波束补偿之后，对其进行Radon变换，再利用该文提出的结合边缘检测技术的搜索算法得到的参数，完成目标与海杂波分离处理。

We introduce the general sigma point selection framework, and give two kinds of efficient methods: a reducing the computing complexity by decreasing the number of the sigma point; b scaling the sigma points to influence the effects of the higher order moments, then improve the accuracy of the UT; c Convergence analysis of the UKF, when used as an observer for nonlinear deterministic discrete-time system, is presented. Based on the UKF that captures the posterior mean and covariance accurately to the second or third order term (in terms of Taylor series expansion) for any form of nonlinearity, sufficient conditions to ensure local asymptotic convergence are established.

论文介绍了sigma点的一般选取规则，并给出了两种有效的方法：a通过减少sigma点集合的元素的数目来减少计算复杂度，b通过增加参数来逼近泰勒展开的高阶项，从而提高UT变换的精度；c论文研究了UKF算法应用于非线性确定性离散时间系统时的收敛性问题。

The average standard deviation of the final transformation parameters was sub-voxel, sub-millimeter, and within 0.010 radians.

最后的变换参数的均方差值是亚像素、亚毫米级的，在0.010弧度以内的。

The spatiotemporal spectral line intensities of the first three atomic lines in Hydrogen Balmer series (λ=656. 28, 486. 13, 434. 05nm) of RF ion source plasma, are measured with calibrated Optical Multichannel Analyzer . Some plasma parameters, including electron temperature, hydrogen atom density and hydrogen ion density, are calculated and analyzed Using Partial Local Thermodynamic Equilibrium theory and Abel transform.

实验采用绝对定标后的光学多道分析系统测定了离子源等离子体不同时间和空间位置的氢原子巴耳末谱线系中前三条谱线（λ=656.28，486.13，434.05nm）的强度，并采用PLTE的理论和Abel变换方法，计算出了高频离子源等离子体的电子温度、氢原子浓度、氢离子浓度等参数在放电的不同阶段和径向分布情况，并进行了简要分析。

In chapter four, the DSP control PPS bidirectional DC/DC converter prototype parameter is designed.

第四章设计了基于DSP控制的大功率双向DC/DC变换器的电路参数。

And the matching point pairs are obtained by comparing the Euclidean distance of the Zernike moments,which are computed around a circular neighborhood centered at the feature point.Then the transform parameters are computed through the correct mapping model.Finally,the weighed average method is used to achieve image mosaic.

该算法利用曲率尺度空间角点检测法提取特征点，通过比较各特征点圆形邻域Zernike矩的欧式距离得到匹配点对，然后利用正确的映射模型计算出变换参数，最后采用加权平均法得到图像的拼接结果。

In the new expressions, the definition of fundamental magnifying factor for the 4 kinds of circuits is the same. They are easy to solve A in calculation, without considering the loading effect of feedback network any longer, and an unidirectional conversion can be made; meantime, they can directly describe the effect of every circuit component parameter on closed-loop voltage gain.

新关系式中4种电路基本放大倍数的定义相同，容易计算，不再需要考虑反馈网络的负载作用，而做单向化变换，并能直观描述各电路元件参数对闭环增益A的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。