查询词典 third boundary value problem

In the first step,through using the formula of the conformal transformation,a continuous medium with regulation boundary in original area could be transformed to a homogeneous medium with anomalous boundary in complex area,so the new constant velocity field could be more adapt to the current Stolt migration's conditions.

首先，利用保角变换法可将不规则边界的单连通区域转变成规则边界的原理，将规则边界的连续介质场转变成不规则边界的均匀介质场，使该均匀介质场更适应现有Stolt等偏移方法对速度场的要求；其次，对改变了区域的模型地震记录进行常规的偏移成像处理；再利用推导出的反变换公式对成像结果进行反变换，得出模型的真实偏移成像结果。

After World War Ⅱ there remain territory and boundary disputes among most ASEAN countries, which fall into two types, one being the dispute on land boundary or islands sovereignty, the other on the exploring of ocean resources and delimiting of territory waters and continental shelf among them.

二战后东盟国家之间大都存在着领土边界争端，其实这种争端主要有两种：一种是东盟国家之间的陆上疆界或岛屿主权的争端；另一种是东盟国家之间因海洋资源的获取、领海及大陆架疆界的划分问题而出现的争端。

In this paper,the boundary singular kernel method in Reproducing Kernel Paicle Method has been applied to impose the essential boundary conditions in EFGM by revising the MLS shape function.The stress field and the displacement field are analysed by linear elastic theory.The contour integral method is used to calculate the J-integral,then the stress intensity factors of mixed-mode crack is acquired.The correctness and the validity of the method are validated.

本文将再生核质点方法中的边界奇异权方法引入EFGM中，通过对MLS形函数进行修正实现了本质边界条件在节点处的精确施加；运用线弹性断裂理论分析裂纹板的应力应变场，采用围线积分法计算J积分，给出了复合型裂纹板的应力强度因子的无网格伽辽金方法。

By using integral transformation method, viscoelastic mixed boundary problems can be made to correspond with elastic mixed boundary problems,which is the well-known correspondence principle.

本文结合国内外的研究成果，就粘弹性力学中存在的各种对应原理及数值反演方法进行了归类和总结。

The covalent bond theory in quantum mechanics is used to describe scientifically the dynamic character of the boundary of enterprise, and the notional model of the enterprise fuzzy and dynamic boundary is founded in this paper.

第一，为了科学的描述企业的边界是如何呈现出模糊动态性的，引入量子力学中共价键的相关理论，构建了企业模糊边界概念模型。

Saint-Venant torsion ; curvilinear crack ; boundary integral equation ; boundary element ; stress intensity factor

Saint-Venant扭转；曲线裂纹；边界积分方程；边界元；应力强度因子

The method uses Cartesian grid for the majority of flow field with special treatment to cells cut by the solid boundary, thus not only retains the advantage of Cartesian grid's high solving speed, but also ensures the high precision near the boundary, which avoids the distortion coming from scalariform mesh with traditional difference method.

该方法在流场主要区域采用笛卡尔网格，而对与固体边界相交处的单元采用特殊的处理。这样既保留了笛卡尔网格求解速度快的优点，同时在边界处又保证了精度，避免了传统差分法处理该类问题需采用阶梯形网格逼近而导致的失真问题。

To research the propagation characteristics of travelling wave along transmission line in depth, the authors establish a mathematical model of travelling wave along lossless transmission line with the format of discrete time and space mesh lines, derive the stable condition and boundary condition of the wave equations using numerical solution of partial differential equation, and attempt the simplification of the boundary condition to realize full decoupling of voltage and current.

为深入研究行波在配电线路上的传播特性，建立了时间-空间网格线离散格式的无损传输线行波数学模型，采用偏微分方程的数值解法推导了波动方程的稳定条件和边界条件，并尝试对边界条件进行简化，以实现电压和电流的完全解耦。

In this paper,the diagonal Cartesian method simulating the complex boundary, together with thetreatment to wetting-drying dynamic variation of the boundary, is applied into thetwo-dimensional shallow-water flows and sediment transport mathematical modeling,and their governing equations are discretized and solved in diagonal Cartesiancoordinates.

本论文采用斜对角笛卡尔坐标方法对不规则的复杂边界进行模拟，重点处理好干湿动边界的变化，并在斜对角笛卡尔坐标系中进行二维浅水运动的水流泥沙基本控制方程的离散和数值计算求解。

And the devices'properties and improve the properties to prepare the artificial boundary. The bi-epitaxial YBCO superconducting film with 45°grain boundary in a-b plane was made for the first time in China in this article by magnetic sputtering instrument that was designed and fabricated by ourselves. The x-ray θ～ 2θ scan 、Ф scan、rocking curve、non-symmetry diffraction and SEM、 TEM、AES etc. were utilized in the study.

为此，本工作采用自行设计制造的全金属密封超高真空磁控溅射设备，利用x射线θ～2θ扫描、Ф扫描、摇摆曲线、非对称衍射及SEM、TEM、AES等分析测试手段，在国内首次、也是至今唯一的一家，制得a—b平面内具有45°人工晶界的双外延YBCO超导薄膜，并进而得到双外延晶界Josephson结。

Now he worked in ajoint venture.

现在他在一家合资企业工作。

More troops in Afghanistan won't change any of the foregoing.

更多的在阿富汗的军队也不会改变之前的状况。