The designing approach of difference schemes by controlling the remainder‐effect

In this paper, based on the idea of the ‘modified partial differential equation’, a new designing approach to explicit finite difference schemes for the Burgers equation and PDE is proposed. The approach differs from other constructured methods in such a way that it considers the requests of the numerical dissipation and dispersion coefficients first. This method is much more constructional and directional. The results of numerical tests indicate that the method is quite successful. Copyright © 1999 John Wiley & Sons, Ltd.     

Micro-phase measuring profilometry: Its sensitivity analysis and phase unwrapping

Global illumination affects shape measurement accuracy, and phase unwrapping is an important problem in phase measuring profilometry. In this paper, a micro-phase measuring profilometry is proposed to reduce the effects of global illumination. The wrapped phase error level of the proposed method is lower than that of the traditional micro-phase shifting method. First, a frequency selection rule is developed in combination with the micro-phase rule to design the frequencies of the proposed phase measuring profilometry. The frequency rule is obtained by analysing the uncertainty of the wrapped phase caused by intensity noise. Then, phase unwrapping is regarded as a congruence problem, and the closed-form robust Chinese remainder theorem algorithm is adopted to determine the correspondence. Finally, the comparative experiments are conducted on a projector-camera system. Experimental results show that the effects of global illumination can be effectively reduced with the proposed phase measuring profilometry, and the proposed frequency selection rule is valid. In addition, the performance of the robust Chinese remainder theorem in addressing the phase error is better than that of traditional Chinese remainder theorem. Furthermore, the unwrapping accuracy can nearly reach 100% if the frequency selection rule is satisfied. Otherwise, the performance degrades.     

The Remainder Term of the Taylor Expansion for a Holomorphic Function Is Representable in Lagrange Form

We show that the remainder of the Taylor expansion for a holomorphic function can be written down in Lagrange form, provided that the argument of the function is sufficiently close to the interpolation point. Moreover, the value of the derivative in the remainder can be taken in the intersection of the disk whose diameter joins the interpolation point and the argument of the function and an arbitrary small angle whose bisectrix is the ray from the interpolation point through the argument of the function.     

突发事件用爆炸容器设计方法及寿命评估

 提出了应付突发事件用爆炸容器的设计方法和使用寿命的评估方法，对JBG系列抗爆球罐在爆炸载荷作用后的残余变形进行了计算，评估了多次重复载荷条件下的使用寿命，残余变形的验证实验结果与计算结果基本一致。     

非光滑函数的分数阶插值公式

本文基于局部分数阶Taylor展开式构造非光滑函数的分数阶插值公式,证明了插值公式的存在和唯一性,给出了分数阶插值的Lagrange表示形式及其误差余项,讨论了一种混合型的分段分数阶插值和整数阶插值的收敛阶.数值算例验证了对于非光滑函数分数阶插值明显优于通常的多项式插值,并说明在实际计算中采用分段混合分数阶和整数阶插值可以使得插值误差在区间上分布均匀,能够极大地提高插值精度.     

带齐次权的Hardy型不等式

在采用Hoffmann-Ostenhof和Laptev构造权函数的思想,进行加权推广,给出了一类带齐次权的Hardy型不等式.利用Avkhadiev和Wirths得到的一维Hardy型不等式,运用放缩法,得到一类带余项的加权Hardy型不等式.获得的结论将HoffmannOstenhof和Laptev中的相关结论推广至加权与带余项的情形.     

An asymptotic expansion of the solution to a system of integrodifferential equations with exact asymptotics for the remainder

We obtain an asymptotic expansion of the solution to a system of first order integrodifferential equations taking into account the influence of the roots of the characteristic equation. We establish exact asymptotics for the remainder in dependence on the asymptotic properties of original functions.     

关于方阵高次幂计算方法的一个注记

一般地,求方阵的幂总是先将其标准化,然后通过相似变换得到.然而矩阵的标准化过程却是十分复杂的,所以应用范围受到很大的局限性.利用凯莱-哈密顿(Cayley-Hamilton)定理,可以得到计算方阵高次幂的一种非特征值方法.     

On the Hermite interpolation

Explicit representations for the Hermite interpolation and their derivatives of any order are provided.Furthermore,suppose that the interpolated function f has continuous derivatives of sufficiently high order on some sufficiently small neighborhood of a given point x and any group of nodes are also given on the neighborhood.If the derivatives of any order of the Hermite interpolation polynomial of f at the point x are applied to approximating the corresponding derivatives of the function f(x),the asymptotic representations for the remainder are presented.