查询词典 geometrical boundary condition

The paper studies fault diagnosis technology based on fruticose gas pipe network which is universal in small towns,and gives a particular description of domestic and foreign gas pipe network fault diagnosis technique based on hardware and software currently. The author uses graph theory to build up hydraulic analysis model of natural gas network and presents its solution methods. Besides, the author works out the relation between gas pipe pressure and flux in unsteady condition of fluid flow according to pressure boundary condition and differential equation group, and puts forward fault diagnosis methods and steps of the fruticose natural gas pipe network of middle pressure based on the simplification of this relation.

本文针对小城镇比较普遍的枝状天然气分配管网进行故障诊断技术研究，详细叙述了目前国内外基于硬件和软件的燃气管网故障诊断技术，利用图论理论建立了天然气管网水力分析模型并叙述了其求解方法，根据燃气管内流动的微分方程组和压力边界条件求解出非稳定流动时燃气管道压力和流量的关系，并在对此关系进行简化的基础上提出了基于中压枝状天然气管网的故障诊断方法和步骤。

The model parameters include boundary condition, initial condition, hydrological and geomorphological parameters and the other parameter for controlling the model simulation process.

在不规则无结构网格中，在洪水模拟计算时要用到的网格与边的关系、网格与结点的关系及边与结点的关系必须建立；④模型参数的确定。

In the condition that fault infeed from both terminal is given, the fault point can be found out according to the boundary condition of fault point.

在已知线路任意点的左右侧注入电流的情况下，可以根据故障点边界条件搜索出故障点。

The author disserted the principle and range of intercepting the local model, the methods of applying force and displacement boundary condition, the principle and method of selecting likely most unfavorable live load condition for the joints mechanical states.

论述了结点的截取原则和范围，力边界条件、位移边界条件的施加方法，结点受力状态可能最不利活载工况的选取原则和选取方法。

The results showed the modelling es-tablished and its condition for determination and solving could be used as predic-tion and simulation of the flucturation of soil water in the field under subdrainagecondition,the soil water status in the winter wheat and barley field could be ob-tained at different falling rates of underground water table under any meterologi-cal boundary condition.

结果表明，所建立的模型和定解条件能较好地拟合排降条件下田间土壤水分的变化，可以求获一定外界气象条件下，不同地下水降落速度时，麦田水分变化状况。

The technique of boundary-fitted coordinate system is used to overcome the difficulties resulting from the complicated shapes of natural river boundaries;the method of alternating direction implicit finite difference scheme is used to solve the partial differential equations in the transformed plane;and the technique of moving boundary is used to deal with the river bed exposed to water surface.

用适体坐标技术克服天然河道复杂的几何边界给有限差分法所带来的困难；用交替方向隐式有限差分格式求解变换平面上的偏微分方程；用动边界技术处理河床的淹露。

An adaptive grid scheme controlling cell area is used to generated grids in the divergent section of symmetric annular nozzle, and the generated grids are used in the flowfield calculation through the uncoupled way. The elliptic equations are used to generate grids in three dimensional regions of FDN divergent section, the source terms used in the equations employ a mathematical form which is independent of the boundary shape and of the boundary grid point distribution, the free parameters contained in the source terms are determined by the two restraint conditions, the intersection angle of transverse grid lines with boundaries and the local curvature of the transverse grid lines at the boundaries, and the interior grid distribution controlled directly by the grid point distribution assigned on the boundaries is realized, it makes the grid more clustering near the nozzle wall. For the generated grids in the whole computational regions have a good smoothness and orthogonality, the accuracy of calculation in the flowfield is ensured.

对轴对称的环形喷管采用控制网格面积的自适应网格方法对扩散段部分进行了网格生成，并通过非耦合方式应用于喷管的流场计算中；对强制偏流喷管扩散段内的三维区域采用椭圆型方程进行网格生成，方程中的源项采用了与边界形状和边界网格点分布无关的数学形式，源项内的自由参数由横向网格线与边界的交角及横向网格线在边界处的局部曲率两个约束条件来确定，实现了由边界上的网格分布直接控制内部的网格点，使壁面附近具有较密集的网格，并且在整个计算区域内的网格都具有良好的光滑性和正交性，从而保证了流场计算的准确性。

In region of columnar grain, preferred orientation growth is obvious. Obviously preferred orientation on 〈001〉 was confirmed by the antipole figure. Besides, the CSL grain boundary such as ∑3,∑5 and so on are observed. Among these kinds of boundaries, the ∑3 boundary has the highest frequency.

测试结果表明：CVDW生长组织具有三个生长区，分别是等轴晶区、混合生长晶区和柱状晶区；柱状晶区的晶粒具有显著的〈001〉择优生长；低∑CSL晶界占据较大比例，其中以∑3、∑5为主要结构，∑3的出现频率最大。

The basic idea is to set a continuous solution of the region with a finite number of discrete points instead of a grid consisting of, these discrete points called grid nodes the solution of a continuous area on a given function of continuous variables used in the definition of discrete grid variable function approximation the original equation and boundary conditions in the micro-business operators to approximate differential, integral with the points and to approximate, so the original differential equations and boundary conditions are replaced by algebraic equations near Side, that is, finite difference equations , solve this equation group can get the original problem in discrete points on the approximate solution.

基本思想是把连续的定解区域用有限个离散点构成的网格来代替，这些离散点称作网格的节点；把连续定解区域上的连续变量的函数用在网格上定义的离散变量函数来近似；把原方程和定解条件中的微商用差商来近似，积分用积分和来近似，于是原微分方程和定解条件就近似地代之以代数方程组，即有限差分方程组，解此方程组就可以得到原问题在离散点上的近似解。

The concentration of D-phenylalanine in the external phase and the separation factorαcan be expressed as: The diffusion of boundary layer in outer aqueous phase is the controlled process while the concentration of D-phenylalanine in the external phase far less than the concentration of chiral carrier in the emulsion liquid membrane phase, then the diffusion coefficient k_e of boundary layer in outer aqueous phase can be achieved by data fitting.

外水相苯丙氨酸对映体的浓度以及分离因子α表示为：当外相对映体浓度远小于液膜相手性载体浓度时，该手性传质过程中外相边界层的扩散为控制步骤，利用数据拟合得到了外水相与液膜相界面边界层扩散的传质系数k_e。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。