计算时间

After contrasting and optimizing this paper gets a set of parameters. Then according to these parameters the paper sets up entity model, and after validating and analyzing with finite element it can save time of calculating. On the other hand, it can provide a good method of design of moldboard plow surface.

通过对这四个阶段中土垡的运动学和动力学分析研究，建立了犁体牵引阻力的数学模型；通过对比分析得到较优的一组参数，然后以该组参数为依据进行参数优化，最后以优化后的参数建立犁体实体模型，应用有限元进行分析，节省了计算时间和提高了计算效率，为今后犁体曲面设计提供了一种方法。

In this paper,it has studied the method of dealing with changing parameter.It is derived for the optimal flight trajectory calculation model from minimum theory.A simple calculation method is applied in calculating differential equations of two points boundary value question.

针对变参数的处理方法进行了研究，给出了计算时间最短水平机动运动的数学模型，并提出了一种简单适用的两点边值问题数值计算方法。

Firstly, the three-dimension boundary question and its corresponding variation question concerning the point-source electrical field on a 3-D structure are presented. Secondly, the finite element method is used to solve the variational equation. The study area is divided into many tetrahedral elements. Then, we interpolate with a tri-linear function in each element. So, the variational equation is converted into a linear equation system. Finally, taking into account saving of time, we make use of symmetric successive overrelaxation preconditioned conjugate gradient algorithm to solve large linear system, and obtain the potential value of each node, resulting in the calculation of the apparent resistivity values on the ground surface.

首先给出了三维构造中点源电场的边值问题以及相应的变分问题；然后利用有限单元法求解变分问题，采用四面体单元对研究区域进行剖分，在单元中进行三线性函数插值，将变分方程化为线性代数方程组；最后，考虑到节约计算时间，利用对称超松弛预条件共轭梯度迭代算法求解大型线性方程组，得到了各节点的电位值，进而计算出地表的视电阻率。

In order to save the CPU time, the approach of searching its nearest generator for a grid was developed, which was based on the quadrantal location of generator grids in a raster space.

为了减少计算时间，设计了一种搜索某个栅格所属最近发生元的方法，它是根据对于该栅格而言发生元栅格所处的象限位置来计算的。

It is emphasized in this paper that the recomputation under the nonlinear conditions and also with different data dependency in context is the core of solving the problem of the contradiction between cost complexity and spatial cost.

同时本文强调，研究非线性情形下的重复计算以及三种数据相关性(即变量的依赖相关、IO相关和迭代相关)，是有效解决微分模式较高计算时间和空间存储代价难题最为根本的出发点之一。

During the simulation, surface current from primary electrode is computed. Taking rectangular triangle as the mesh unit, the integral formula of surface current can be simplified to a product of a difference expression and the surface area. So the computation complexity of FEM will be decreased and the time-cost will be cut down greatly.

在模拟过程中，需要计算主电极表面电流，通过选用直角三角形作为离散单元，将表面电流的二重积分表达式简化为一个差商表达式与主电极表面积的乘积，极大地降低了有限元分析的复杂度，减少了计算时间。

Renumbering node number of finite element makes the bandwidth reduced,the consumption of RAM decreased and computing speed increased.

改善有限元的结点编号可以减少带宽，从而减少内存的消耗，减少计算时间，提高计算速度。

And, on this basis, the VC++ language was used to program the computer. The computerized example was compared with the practical test, and the result showed that the simplification made to the conservation scalar quantity method is feasible on the whole, and compared with the original conservation scalar quantity method, the simplified method has the advantages that programming is more simple, and calculation time can be shortened.

在此基础上，用VC++语言进行编程，将计算后的实例与实际的试验对比验证，结果表明：对守恒标量法所作的简化基本可行，与原来的守恒标量法比较，简化后的编程简单，计算时间缩短。

The solution of a sparse and dense symmetric system of linear equations is essential to finite element simulation in geotechnical engineering.

在岩土工程中进行有限元分析时需要求解大型线性方程组，常用的直接法会占用较大的内存，耗费计算时间较长，计算节点规模有限。

In this method, FEM and BEM decrease the calculation time, and tetrahedral element method can avoid deformation element.

有限元和边界元相结合的方法大大减少了计算工作量和计算时间；模型中采用四面体单元剖分线性单元网格，很好地避免了传统方法中出现的准六面体畸形网格。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。