二层的

The basic concept in these sections is replacing backward Euler's method by modified backward Eulers's method to approximate the characteristic differential equation and discretizing the convection-diffusion equation at the middle point of the approximate characteristic curve, which will make the convective term get up to second order accuracy.

这三节的基本离散方法是用改进的Euler公式代替向后Euler公式来近似特征微分方程，并且将近似特征线的中点作为离散节点，使得对流项的离散精度提高到二阶，对于扩散项，将其转移到待求时间层进行离散。

The few particles of pigment that are perhaps remaining from the Romanesque polychrome of a wooden sculpture no more justify the removal of a fully preserved baroque polychrome than do the remains of a Roman ashlar stone wall justify demolition of an entire building that has evolved over the following centuries.

不必为了十一、二世纪罗马式彩绘木雕中一些残存颜料而除去同一件木雕上保存良好的巴洛克式彩绘层。但是，为了保存罗马时代精致的祭坛石墙，可以考虑毁去数世纪以来夹缠增建、而又坍塌的建筑物。

This method was based on rotation formula of the current magnetic field and the magnetic fields can be expressed by a double integration about spatial radial coordinate and spatial wave number of Bessel function.

由电流磁场的旋度公式出发，推导了多层介质中点电流源磁场的表达式，其为一个关于空间径向坐标和贝塞尔函数空间波数的二重积分。

The book also reveals the most astonishing discovery beyond the memory of men:1\ The magic "Cross Force" in the universe emerge eventually;2\Secret of another group of "X" planets from the solar system;3\ The invisible hand pushing the earth rotating reveals its real look;4\The stillness enigma of the background space in the fixed-star lay of the solar system comes out in the wash..

该书还披露了人类有史以来最惊人的大发现：一、宇宙神奇的"十字力"终于显现；二、太阳系另一组"X"行星大揭秘；三、推动地球运动的无形之手露出真面目；四、太阳系恒星层背景空间静止之谜大白于天下。

It results from the fact that the biquadratic coupling fieldand uniaxial anisotropy of the ferromagnetic counteract each other, so the oscillationsare weakend and the curves are smoothened.

这是由于双二次耦合体现的单轴各向异性与铁磁层单轴各向异性具有相反的符号，二者互相抵消，因此使振荡减弱，曲线变的光滑。

The nonlinear stability of three-dimensional disturbances for the Blasius boundary layers is studied. We adopted here the high accuracy method of using the expansions in orthogonal functions along the normal direction and the effective algebraic mapping to deal with the problem in the infinite region. The initial solutions of two-dimensional harmonic waves are given by Landau expansion, and the mean-flow-distortion is calculated by the approximation equation.

运用Landau展开给出了二维谐波的初始解、通过求解线性PSE而得到TS波和C型亚谐扰动的初始站值、以及近似地模拟初始站的均流变形值，以此为初始条件，并结合迭代-预估校正方法来实现非线性PSE的求解和推进，详细地研究了非平行边界层三维扰动C型失稳过程。

A class of boundary value problem for elliptic equation with two parameters is considered.

由解的结构指出，在两参数一定的情况下，相应问题的解只具有二个边界层。

In order to get the numerical solution, the paper devises a three hierarchic implicit scheme which eliminates the strict restriction of explicit scheme, thus, it can be used in more areas. By using the energy estimation method, the convergence and stability of the difference scheme are proved and the scheme is second order convergence for time and space.

对求解方程构造了一个三层隐式差分格式，消除了显格式的稳定性对计算步长的严格限制，使之适用范围更广，并用能量估计的方法严格证明了差分格式的收敛性与稳定性，该格式对于时间和空间均具有二阶收敛性。

Multiple depositions of patterns to different filter types, including dichroic, can be aligned with remarkable micron-scale precision and repeatability.

多层不同滤光器类型的图案沉积，包括二色性的技术，可以提供卓越的精确度和可重复性。

Under the guidance of the theories of sedimentation, paleontology, stratigraphy, reservoir geology and digenesis, synthetically applying the methods of the conjunction of spot-line-surface, macro-microscopic and field-indoor, there is a comprehensive study for the upper Permian series in stratum, rock, sedimentary facies and diagenesis, especial for the type and characteristics of sedimentary facies, in the paper.

本文主要是以沉积学、古生物学、地层学、储层地质学等相关理论为指导，运用点线面、野外与室内、宏观与微观相结合的方法，并借助普通显微镜、阴极发光显微镜等手段对川西地区北部上二叠统的地层、岩石、沉积相以及成岩作用进行了研究，尤其是对沉积相的类型及特征作了详细的划分与阐述。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐