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Rader's algorithm, exploiting the existence of a generator for the multiplicative group modulo prime N, expresses a DFT of prime size n as a cyclic convolution of size N 1, which can then be computed by a pair of ordinary FFTs via the convolution theorem (although Winograd uses other convolution methods).

Rader演算法提出了利用点数为N的DFT进行长度为N-1的回旋摺积来表示原本的DFT,如此就可利用摺积用一对基本的FFT来计算DFT。

The Fresnel integral can be computed on the basis of geometrical properties of the Cornu spiral .

利用科纽卷线的几何特性,可以计算菲涅耳积分。

Objective To evaluate the clinical values of 16?slice spiral computed tomography coronary angiography.

目的评价16层CT冠状动脉成像的临床价值。

Coronary thrombosis ; Tomography ; X-ray computed ; Magnetic resonance angiography

冠状动脉血栓形成;体层摄影术; X线计算机;磁共振血管造影术

Key words:Dysgenesis of the corpus callosum;Tomography;X ray computed;Magnetic resonance imaging

关键词]胼胝体发育不全;体层摄影;X线计算机;磁共振成像

Methods The imaging findings of 9 cases Dysgenesis of the Corpus Callosum diagnosed by computed tomography and magnetic resonance imaging were analysed retrospectively.

对9例经CT或MRI检查诊断为胼胝体发育不全的影像学表现进行回顾性分析。

A direction of search based on the local behavior of cost and various constraint functions is computed at this starting point.

根据费用和各种各样的限制作用地方行为的查寻的方向被计算在这个起点。

The van der Waals term is usually computed with a Lennard-Jones potential and the electrostatic term with Coulomb's law , although both can be buffered or scaled by a constant factor to account for electronic polarizability and produce better agreement with experimental observations.

范德华项经常以 LJ 势能计算,静电项用库伦公式计算,而二者都能用常量因子缓冲和标度以解释静电极化,并与实验观察更好的相一致。

A computed method of the bond formation power between atoms in crystal was presented with combination of both Yu′s "The empirical electron theory of solids and molecules" and Pauling′s covalence bond theory.

将固体与分子经验电子理论和 Pauling 共价键理论相结合,提出了计算晶体原子间成键能力的方法,并计算出常用的3 种触媒 Fe, Co, Ni原子间的成键能力分别为 2911 1, 2955 3, 2956 4。

The inconsistencies of dimensional reduction and naive dimensional regularization in dealing withChern-Simons-matter theory are analyzed.The consistent dimensional regularization combiningwith higher covariant derivative regularization is adopted to consider Chern-Simons field theorycoupled to complex scalar and spinor field.All the local parts of one-loop two-point functionsand three-point functions are computed.Slavnov-Taylor identity is combined with these explicitcalculation results to give the one-loop local effective action.The finite gauge invariant quantumcorrection is shown and finite wave function renormalization constant for each field is defined.Thelocal part of one-loop three gauge field vertex is especially evaluated and it is verified that thereexists a renormalization choice compatible with BRST symmetry.

然后计算了所有的两点函数和三点函数单圈修正的定域部分,利用S-T恒等式给出了单圈定域有效作用量,定义了场的重正化常数,发现物质场和规范场都存在有限的规范不变的量子修正,并讨论了这些有限的规范不变的量子修正的物理意义,进而通过考察单圈三规范场顶角,表明存在与BRST对称性相容的重正化选择。5、在背景场方法的框架下,选择高阶协变导数正规化与维数正规化的杂化正规化方案计算了背景场两点函数的两圈量子修正,结果表明,标志紫外发散的极点项恰好抵消;进一步利用背景场方法中明显的规范对称性,证明背景场三点函数的两圈图贡献也是有限的。

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