查询词典 definite

Everything about her had been smooth and definite, even the tones of her voice and the way her light brown hair, which she wore a la Pompadour*, was rolled stiffly back from her forehead and coiled in a burnished rope on the top of her head.

她的一切都是那么安详平淡，那么不事张扬，甚至包括她说话的声调和她选择的发式；她梳的是高卷式发型，淡褐色的头发从前额向后紧紧地卷过去用一根光亮的头绳盘绕在头顶上。

The physical meaning of the dynamical equilibrium relationships, velocity space-time distribution and energy propagation involved in the energy matrices can be described by the positive definite quadratic form of the energy matrices.

能量矩阵蕴含的动态力的平衡关系、速度的时间_空间分布和能量的传播及变化的物理意义，能够从能量矩阵的正定二次型特性表述出来。

The relation between the output phase differences and the losses of 2×2 and 3×3 optical fiber couplers with rotatory symmetry is deduced in this study, which is based on the characteristics of scattering matrix and Hermite positive definite quadratic form of the couplers.

前 言光纤耦合器用于诸如光纤干涉系统、光纤环、波分复用器件和光纤通信中的分集接收等场合时，除了要求适当的输出功率比以外，尚需考虑输出端光场间的相位关系［1～3］。

optical fiber coupler, scattering matrix ; output phase difference; Hermite quadratic form ; positive definite matrix

利用其散射矩阵为酉矩阵的么正性不难证明，2×2耦合器输出相位差恒为90°，与输出功率比无关，而耦合区具有旋转对称结构的3×3耦合器的输出相位差完全取决于输出功率比，特殊地，当等分功率输出时，输出

In addition, this algorithm is not only insensitive to initial clustering number just like traditional methods, but also free of the optimization process for kernel parameters due to the use of conditionally positive definite kernel.

此外，该算法不再像传统基于聚类的辨识算法那样对初始的聚类个数敏感，而且由于条件正定核的使用，使得辨识算法免去了核参数优化的过程。

A conditionally positive definite kernel based fuzzy C-means clustering algorithm is used to make a partition for the data set.

传统模糊C均值聚类方法依赖于数据分布形状，并且对孤立点敏感，这势必影响到最终的模型性能。

This paper presents a stability criterion for design iterative learning controller. From the criterion,one can change the design problem into finding a positive definite discrete matrix kernel. It has been shown that what kind of variable can be controlled by the iterative learning,(2) and what kind of filter can be included into the controller.

摘要提出了一种针对自学习控制的稳定性判据，应用这一稳定性判据将自学习控制器的设计转化为寻找正定离散矩阵核，从而回答了两个问题，其一什么样的量可以通过自学习叠代加以控制，其二学习叠代中什么样的滤波环节的引入不会影响学习收敛性。

The method improves performance of KPCA by reasonably combining a local conditionally positive definite kernel and a global kernel. The experiment results indicate the new kernel function certainly improves the performance of KPCA.

利用组合核函数提高核主分量分析的性能，该方法将一个全局核函数与一个新的局部核函数条件正定核函数进行合理组合，从而提高KPCA所提取特征的质量。

Positive definite matrix occupies a very important position in matrix theory, and has great value in practice.

正定矩阵在矩阵论中占有十分重要的地位，在实际中也有广泛的应用价值。

If a symmetrical matrix is positive definite, the determinants of all its minors are also positive.

如果对称矩阵是为正定者，它的所有子式的行列式也都是正的。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。