2) Fast Fourier Transformation(FFT) and Inverse-Fast Fourier Transformation(IFFT)
傅立叶变换与逆变换
3) Laplace inverse transformation
Laplace逆变换
1.
Solution of detention-including Laplace inverse transformation;
含有延迟的Laplace逆变换的求解
2.
By using Laplace inverse transformation method, a two-dimensional time-dependent partial differ-ential equation for crystal growth is analyzed and the solution is obtained.
对定常速度下二维非稳态晶体生长的数学模型进行了分析,证明了解的唯一性,并运用Laplace逆变换法对该定解问题进行求解,最后给出了一个具体的例子。
3.
Based on the generation theorem in terms of the Laplace transformation and the properties of exponentially bounded integrated C-semigroups,the Laplace inverse transformation for exponentially bounded integrated C-semigroups is deduced.
以积分C半群生成定理的Laplace刻划为基础,利用积分半群的性质,推导出指数有界积分半群的一种表达形式——Laplace逆变换形式。
4) inverse mapping
逆变换
1.
On the basis of the available finite element model with respect to the composite rock mass and bolt,by means of isoparametric inverse mapping,the model is further discussed after taking general conditions into account,and make it have more extensive uses.
在现有的岩锚组合的有限元模型的基础上,利用等参逆变换方法,对这种单元的一般的情况做了进一步的探讨,使其更具有广泛的适用性。
2.
There is no explicit formulation of inverse mapping about the isoparametric element, so inverse mapping is avoided in finite element analysis.
由于等参元不存在逆变换的显式 ,所以在有限元分析的列式中都回避等参元逆变换 。
6) inverse transformation
逆变换
1.
To solve these problems,a mathematical relation using feedback control to obtain the inverse models of known models was derived and analyzed,and the principle of feedback model inverse transformation was presented.
针对工程上模型求逆实现困难,以及反馈控制对模型求逆进行参量辨识的理论模糊不清等问题,推导并分析了利用反馈控制对已知模型进行逆变换的数学关系,提出了反馈模型逆变换原理,并讨论了利用该原理进行参量辨识的电气自动控制系统应用实例。
2.
In order to improve the fidelity of video frequency signal, this article applies Swerling model to the design of video frequency echo simulation circuit in a radar training simulator by setting up a database using the inverse transformation, modulating the echo amplitude with respect to its azimuth and range, which results in the output of video frequency echo amplitudion fluctuation at random.
将施威林起伏模型引入雷达训练模拟器的视频仿真电路设计中,通过逆变换法建立数据库,对回波幅度在方位、距离上进行调制,使输出的仿真视频回波幅度随机起伏变化,从而提高视频信号的逼真度。
补充资料：Radon变换和逆Radon变换
Radon变换和逆Radon变换
X线物理学术语。CT重建图像成像的主要理论依据之一。1917年澳大利亚数学家Radon首先论证了通过物体某一平面的投影重建物体该平面两维空间分布的公式。他的公式要求获得沿该平面所有可能的直线的全部投影(无限集合)。所获得的投影集称为Radon变换。由Radon变换进行重建图像的操作则称为逆Radon变换。Radon变换和逆Radon变换对CT成像的意义在于，它从数学原理上证实了通过物体某一断层层面“沿直线衰减分布的投影”重建该层面单位体积，即体素的线性衰减系数两维空间分布的可能性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条