关于根幂为根的多项式

设n次多项式f(x)的n个根为a1,a2…an,k为正整数，设φ（x）的n个根为a1^k,a2^k…,an^k，本文得到了φ（x）的两个表达式。     

On the impact of anisotropic mesh adaptation on computational wind engineering

This paper addresses the critical issue of the accuracy of CFD predictions for wind engineering. Flows around the Silsoe Cube, a high‐rise building (the Jin Mao Tower), and a low‐rise large‐span building (the Pudong International Airport) are computed with the Navier–Stokes solver FENSAP and compared with measurements. Computations are carried out for two wind directions, by solving the steady‐state ensemble‐averaged Navier–Stokes equations with the Spalart–Allmaras one‐equation turbulence model. Pressure coefficients compare well with wind tunnel experiments and the accuracy of the flow solutions is further improved via an automatic mesh adaptation that dynamically places grid points where the flow physics require them, while keeping the number of unknowns and solution time substantially at the same level. Copyright © 2009 John Wiley & Sons, Ltd.     

客运专线隧道双侧壁导坑法施工技术

介绍了双侧壁导坑法特点，从施工工艺要点、施工注意事项等方面阐述了客运专线隧道双侧壁导坑法施工技术。     

基于ANSYS参数化语言的隧道混凝土二维细观力学模型的实现

从细观力学的角度,结合蒙特卡罗法对隧道混凝土细观模型进行的研究讨论,基于ANSYS的参数化语言实现了隧道混凝土二维细观骨料模型,从而为隧道混凝土的细观力学研究提供了重要的基础。     

万家寨引黄工程北干线1号隧洞施工对沿线部分村庄水井的影响

山西省万家寨引黄工程北干线1号隧洞沿线部分村庄水井枯竭,导致了附近村民吃水困难.通过对1号隧洞排水情况的调查,查找水井柘竭的原因,并采取相应的解决措施.     

锚杆与锚索联合支护在大断面巷道中的应用

通过利用锚杆的悬吊理论进行估算,结合施工经验,阐述了锚杆、锚索联合支护在大断面巷道中应用的理论依据、支护技术及施工要求。     

长大隧道施工测量控制技术

以白马特长隧道为例,从4个方面详细介绍了长大隧道的施工测量技术。     

W型钢带在铁路隧道病害治理中的应用

阐述了W型铜带的性能特点，介绍了W型钢带在铁路隧道衬砌厚度不足情况下的补强加固技术。     

唐山沟矿煤巷锚杆-锚索支护技术研究

针对唐山沟矿煤巷支护中存在的问题及巷道支护现状,提出了煤巷锚杆、锚索支护设计思路,选择了以数值模拟计算为主、工程类比和理论计算为辅的设计方法,对不同的支护设计方案进行了模拟计算,比较后选定了唐山沟矿煤巷锚杆、锚索支护参数,并提出了切实可行的施工技术要求.     

Embedding formulae for wave diffraction by a circular arc

For certain wave diffraction problems, embedding formulae can be derived, which represent the solution (or far-field behaviour of the solution) for all plane wave incident angles in terms of solutions of a (typically small) set of other auxiliary problems. Thus a complete characterisation of the scattering properties of an obstacle can be determined by only determining the solutions of the auxiliary problems, and then implementing the embedding formula. The class of scatterers for which embedding formulae can be derived has previously been limited to obstacles with piecewise linear boundaries; here this class is extended to include a simple curved obstacle, consisting of a thin circular arc. Approximate numerical calculations demonstrate the accuracy of the new embedding formulae.