数值技术

With the guide of non-linear program theory, by using interpolative steps and inexact line search, an improved conjugate gradient method was found, by which the training rate of BP networks increases by tens or hundreds of times. Moreover, the improved method is effective to solve non-linear equations for which Newton's method does not converge owing to the problems of the quadratic derivative and inverse matrix.

通过大量的数值模拟试验发现，在非线性规划理论的指导下采用间插步骤和不精确的一维搜索技术改进的共轭梯度法，是基于梯度和共轭方向的连续搜索算法中最有效的算法，这种算法使BP网络的训练速度提高几十到几百倍，使BP网络的实际应用效果大为改善；而且这种算法对于用牛顿法由于求二阶导数和求逆矩阵等问题难于收敛的非线性方程组的求解也是很有效的。

A series of profile numerical simulation are based on the datas of core flooding experiment, including the homogeneous profile positive rhythm section, the rhythm section, interlining profile, interlayer heterogeneity section, intraformational heterogeneity of reservoir section, the actual reservoir simulation. The the section of displacement mechanism of core flow method and the datas of core flooding experiments take into account, the EOR scheme of later stage is CO2 preslug followed by the N2 slug flooding, at last is the waterflooding or depletion type of drive..

为了进一步分析注CO2／N2段塞驱对扫油效率的影响，在岩芯驱替实验的基础上对N2推进CO2段塞驱进行了均质剖面、正韵律剖面、反韵律剖面、隔层剖面、层间非均质剖面、层内非均质剖面、实际油藏剖面的数值模拟研究，通过对比研究，初步认为高11油田在开发中后期提高采收率技术上可选取在适当高的压力条件下，先注前置CO2段塞驱，后续再注N2段塞顶替驱，然后再转注水或衰竭开采的驱替方式。

In this paper, the generator model of constant transient voltage and the invariableness impedance model was used, and the saliency of generator is included; through the analysis of the characteristic of the network equation calculation in the transient stability analysis, a new node ordering algorithm is proposed. Better initial value can accelerate the convergence rate of the networking equations, reduce the number of iterations, thus to cut down the amount of calculating time.

本文首先建立了适合于暂态稳定分析的简单模型，其中发电机采用E_q恒定模型，考虑了发电机的暂态凸极效应，负荷采用恒定阻抗模型；研究了电力系统的暂态稳定分析方法，指出目前数值积分暂态稳定计算方法中存在的不足，主要是网络方程的求解速度过慢；分析了暂态稳定计算中网络方程的特点，将稀疏技术应用于网络方程的求解，提出了一种新的节点编号方法——最小度最小有源节点道路集算法，减少了网络方程的计算量；在进行交替迭代求解时，将预测算法应用于每一积分步网络方程功角和电压的初值估计当中，应用自回归算法和广义延拓算法，期望给出一个更有效的电压和功角初值方案，来加快方程的收敛过程，减少方程迭代的次数，以提高计算速度。

Introduce the numerical well test and reservoir model combination function into the study, realized the efficient description of the seep cell dynamic percolation model of slot and hole type carbonatite reservoir, such as "moniliform","compound" and so on.

本文针对塔河缝洞型碳酸盐岩油藏特殊的储层、油藏地质特征，以及现行解析试井解释方法在缝洞型油藏试井资料解释中面临的主要问题，开展了有限元数值试井新技术应用研究。

The Finite Element Mothed is a new numerical analysis method, and it isdeveloping with the improvement of electronic computer technology.

有限元法是伴随着电子计算机技术的进步而发展起来的一种新兴数值分析方法。

The unsteady viscous motorial grid is fixed relative to airfoils. Numerical results are in good agreement with the experimental data. The method and the procedure presented in this dissertation are verified.

文中对比分析了不同方法、不同湍流模型之间的差异，获得了比较理想的计算结果，验证了本文数值求解技术的可行性以及计算程序的正确性。

It is necessary to use the nonconventional data that has a high resolution due to the time-space limit of the conventional sounding system.

该文利用一个有限区域中尺度模式MM4，采用变分分析技术对有限区域的常规探空资料和非常规云图资料进行变分分析和数值模拟。

Results show that nonspiral plate may adjust the optical intensity distribution in focal region considerably, so we can alter and control the optical intensity distribution in fbcal region by changing the vary rate of phase variation. This technique can be used to carry particles in optical tweezers system

数值模拟结果表明：通过调节相位片的相应变化率，可能方便地调节焦点区域光强分布，因此可通过调节相位片的相位变化来控制和改变焦点区域光强分布，这种技术方法可应用于光钳系统中控制搬运微小颗粒。

We reasoned that the use of pleural-pressuremeasurements, despite the technical limitations to the accuracyof such measurements, would enable us to find a PEEP value thatcould maintain oxygenation while preventing lung injury dueto repeated alveolar collapse or overdistention.

尽管目前的技术使这种方法的准确性有限，我们论证了使用胸腔压力检测来测量PEEP的数值，可以使我们在预防由于肺泡反复塌陷和过度膨胀而引起的肺损伤中找到维持氧合的PEEP。

For the parison forming ,a explanation aboutspecialized method and theory basis of numerical simulation adopted by researchersin China and abroad is given.

介绍了模拟技术在吹塑型坯成型中的研究和发展状况，对国内外学者针对型坯成型过程运用的数值分析方法和理论依据进行了论述，并着重介绍了神经网络方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。