角度变换

Using conformal mapping, the longitudinal protrusion height and the lateral protrusion height on the V-grooved surfaces are given, on this basis, some drag reducing features in parallel-flow, cross-flow and enlarge- flow are presented and analyzed; In addition, drag reducing features with blade-shaped grooves and U-shaped grooves are discussed, consequently, the riblets designing criterions are suggested which will reduce the drag and noise most effectively underwater.

3利用保角变换方法求出V—型条纹的纵向和横向突出高度，在此基础上得出纵向流、横向流和带角度流动时的降阻特性，并分析结果；而且分析了叶片型条纹和U—型条纹表面上的降阻情况，提出水下具有最佳降阻效果的条纹表面设计准则。

This paper, from the view of distribution and fraction, discussed the conditions of circuit equivalent, on the basis of it, using short connection, breaking off the simple circuit, giving out the simple deduction of the resistance Y connection and A connection equivalent exchange .

本文从分流、分压的角度讨论电路等效的条件，在此基础上用短接、断开等方法用简单电路的万法给出了阻抗Y形联接与△形联接等效变换的简单推导。

Fourier-Mellin transformation was added in the optical joint transform correlator recognition of the rotating and rescaling targets to overcome the low recognition ratio.

针对尺度缩放和角度旋转变化目标相关识别率低的问题，在联合相关识别中加入傅里叶梅林变换方法。

To the question of regulating the output voltage and avoiding ripple of series resonant converters, State feedback controller is designed with conversation of energy.

为了调整输出电压及解决纹波问题，本文从能量守衡的角度设计串联谐振变换器的无源性状态反馈控制器。

A novel scheme based on wavelet transform and its reversible transform of fault recording data compression in power systems by adopting lifting algorithm is presented in this paper.

利用提升算法实现了一个基于小波变换的电网故障录波数据压缩的新方案，从采样频率的角度首次给出确定最优分解层数的公式，说明了压缩比与频率的关系；结合实际录波数据，选定误差上限后，给出了通用阈值法中参数的优化取值；对比分析了软硬阈值处理方法。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。