查询词典 approximate differentiability

The Mean-CVaR (Conditional Value-at-Risk) portfolio optimization model is proposed to calculate a globally optimal portfolio under concave transaction costs. A non-decreasing concave function is employed to approximate origin transaction costs function.

研究了当投资组合的风险用条件风险价值（Conditional Value at Risk，简称CVaR）度量，考虑凹交易费用的投资组合选择问题，通过对交易费用采用非线性的凹函数，建立了一个均值-CVaR模型。

We simulate data from multivariate normal distribution with three different sample sizes, and set different missing rates it was found that the coverage probability for bootstrap method is approximate to the confidence coefficient.

本研究模拟三种型态的多元常态分布资料，并且设定不同的遗失比例，分别进行拔靴法、资料扩增法与多重插补三种方法的信赖区间估计。

This contour phase correlation method is superior to the conventional phase correlation in two aspects. Firstly, the contours of images are extracted, and the phase correlation is applied to the contours of images instead of the whole original images, which is more efficient and robust. Secondly, when there are multiple peak values approximate to the maximum peak value in the δ function array, the corresponding translations can be regarded as candidate translations and calculated separately, and the best translation should be determined by the optimization of conformability of two images in the overlapping area.

本轮廓相位相关算法对常规的相位相关算法作了两点改进：(1)提取出图像的轮廓，只对二值化的轮廓图像进行相位相关计算，效率和鲁棒性提高；(2)当相位相关的δ函数阵列中存在多个和最大峰值比较接近的峰值时，将其对应的平移量都作为候选平移量，然后根据重叠区图像的一致性选取其中的最佳值。

The results showed that the crystal are body-centered-cubic, the particles are spherical with an average size of approximate 100 nm, and there is conglutination among the particles.

结果表明，制备的纳米铁微粒是体心立方晶系，颗粒呈球形，平均粒径100 nm，颗粒间呈粘连状。

This article consists of:(1) a brief review of the previous work concerning this subject,(2) the various methods of studying the arrangement of fibers in yarns, and (3)two basic forms of fiber arrangement——approximate cylindrical helix and approximat conical helix——in ordinary cotton yarns, spun by the roller-drafting system The reasons of formation of such arrangement and their influence on yarn strength are also analyzed.

本文分三部分，第一部分引述了国外以往对细纱中纤维排列形态的研究结果，从而引出本文研究目的；第二部分主要介绍了研究棉纱中纤维排列形态的方法；第三部分根据所采用之方法得出试验结果，表明在一般棉纱中纤维排列成近似圆柱形螺旋线与近似圆锥形的复什的螺旋线二种基本形态。

The path is defined as linear combination of a sequence of conjugate directions whichare obtained by applying standard conjugate direction method to approximate quadratic functionof unconstrained optimization.

Bulteau和Vial在[7]中构造了无约束最优化问题的共轭梯度路径，其基本思想是将标准共轭方向法应用于无约束优化目标函数f的局部二次近似函数，得到一组共轭方向序列。

New inspection method was deduced by using constant coefficient of variation in sequence inspection method, and the approximate relationship of inspection variables between mean method and sequence one was gained by analyzing difference of two methods.

将变差系数不变的条件引入到序贯检验方法中，推导出新的结构强度检验方法，分析检验变量与均值法的差异，得到两者的近似关系。

R2 Newton estimated this constant of proportionality, called the gravitational constant G, also referred to as the 'big G', from the gravitational acceleration of the falling apple and an approximate guess for the average density of the Earth.

牛顿根据下落中苹果的重力加速度和他对地球密度的近似猜测估算了这个称为"万有引力常数"的比例常数G。

Secondly, a finite element method is used to approximate the constrained minimization problem, both existence of minimizer for cost functional in finite demensional space and the convergence of minimizer are proven.

然后利用有限元方法对上述定解问题进行离散，并证明了有限维空间上泛函的极小元存在以及有限维空间上的极小元收敛到无限维空间上的极小元。

In this paper, an important property and a theorem have been given about the matrix Thiele's continued fraction which is used to approximate the function of e. Based on the property, the Thiele algorithm is improved. A numeral example is also provided.

文章利用代数知识给出了矩阵指数函数e的连分式逼近函数的一个重要性质和定理，并在此基础上对矩阵指数函数e的连分式算法进行改进，最后用数值例子来验证其可行性。

What was it that made you want to change sider ?

是什么使你临阵倒戈？

I don't know what he wants, but let's play along with him.

我不知道他要干什么，可我