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summation formula相关的网络例句

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与 summation formula 相关的网络例句 [注:此内容来源于网络,仅供参考]

As using Gaussian numerical integration, this paper uses Gauss-Legendre quadrature formula instead of Gauss-Chebyshev quadrature formula in order to avoid the precision decrease due to the singularity of cut-off error at both end points.

在利用高斯型求积公式进行数值积分时,本文采用高斯—勒让德求积公式取代高斯一切比雪夫求积公式,以避免因截断误差在端点出现奇异而导致的精度下降。

In the third chapter, the contractilities and asymptotical stabilities of neutral delay integro-differential equations are concerned. The extended Runge-Kutta methods, with the compound quadrature formula and the Pouzet quadrature formula, are numerically stable under suitable conditions. The numerical experiments prove this result.

第三章,研究了中立型延迟积分微分方程,其理论解的收缩性和渐近稳定性,利用复合求积公式与Pouzet求积公式扩展Runge-Kutta方法,并获得了数值方法的稳定性条件,随后的数值试验结果进一步证明了方法是数值稳定的。

In the second chapter, generalizing the contractilities and asymptotical stabilities for multi-delay integro-differential equations. Under proper stepsize, we obtain the discretization schemes of Runge-Kutta methods with the compound quadrature formula and the Pouzet quadrature formula, and besides, derive the global and asymptotical stabilities. Moreover, the numerical experiments show that the presented methods are highly effective.

第二章,考虑了多延迟情形下的积分微分方程,推广理论解的收缩性与渐近稳定性结果,在适当的步长下,利用复合求积公式与Pouzet求积公式扩展Runge-Kutta方法,获得离散的计算格式,并且证明了方法是数值稳定的,此外,数值试验表明此计算方法在实际应用中是非常有效的。

The error spectra obtained from the results of the data processing by different operators based on rectangular formula, trapezoid formula and their compensation forms are discussed, through which some error features of these operators are obtained.

文中在总体上讨论了诸如矩形公式、梯形公式以及它们的补偿形式等数据处理方法的误差谱,讨论了它们的一系列性质,例如对称性、周期性。

Theequivalence percolation resistance law is accurate enough to be used in productivitycalculation of horizontal well pattern.(3) Productivity of mixed well pattern of horizontalwell or multilateral horizontal well and vertical well is constructed and formulae are simpleenough to be used in the oilfield. The patterns include 5-spot pattern,7-spot pattern and9-spot pattern.(4) Productivity formula of united rectangular well pattern of horizontaland vertical wells is constructed. By this formula, the calculation results show that fora horizontal well length, there is a shape factor at which the productivity of the patternis biggest. So optimum method of the well pattern is proposed.(5) A new concept ofdimensionless length of horizontal well is advanced and the relationship of optimum shapefactor of the rectangular well pattern against dimensionless length of horizontal well ispresented. The influences of length of the horizontal well, area of the well pattern unitand the thickness of reservior are concerned.

利用该公式计算表明:当水平井长度一定时,存在一个最优井网形状,使得水平井的产能最大,在此基础上提出了水平井井网的优化方法;(5)提出了水平井无因次长度的概念,给出了联合井网最优井网形状因子与水平井无因次长度的关系式,并对水平井长度、油层厚度及井网面积对产能的影响进行了分析;(6)推导出了一无限水平井井排在XY 平面内势的解析解,为不同水平井整体开发井网或水平井和直井井网整体开发渗流理论的研究奠定了理论基础;(7)建立了交错式水平井与直井整体开发渗流理论,给出了拟三维条件下井网产能的精确解析解及该井网最优井网形状因子与水平井无因次长度的关系,并对产能的影响因素进行了分析;(8)建立了水平井与水平井正排列井网、交错排列井网条件下渗流理论及井网产能在拟三维条件下的精确解析解,给出了交错井网条件下最优井网形状因子与水平井无因次长度的关系,通过与正方形井网对比,说明优化井网可大幅度提高开采效果;(9)建立了分支水平井和直井面积井网水油两相非活塞驱替条件下渗流问题的解析解,给出了见水前后无因次产量与无因次时间的关系式以及见水时间等。

The author studied the formula of the sum of natural number power, and got a recurrence formula of the coefficient about the sum of natural number′s power, it was better than the other formulas that had been obtained.

研究了自然数方幂和的表示公式,给出了其系数的一个递推关系式,利用递推公式很容易得到幂和的各项系数,为计算机解题提供了依据。

Present a new formula to evaluate the overflow value when upward recursion was used and an improved formula when downward recursion was used.

2利用Mie理论和尺度分布计算了水云的单次散射特性,和资料进行了对比,证明了本文计算方案的可行性。

And thus we ve worked out a new recursion formula of power sum problem ,using it ,we can get the calculationg formula of all the power sum problem .

本文利用二项式定理得到K =8,9,10 ,11时幂和∑ni=1ik 的计算公式,较文[1 ] 中结果表达式简单,并推出了关于幂和问题的一个新的递推公式,利用它可导出所有幂和问题的计算公式。

Moreover, a recursion formula involving the Kth and (K+1)thpolymer moments are deduced. As a result of the recursion formula, theexpressions of the 0-th, 1-th, 2-th and 3-th polymer moments as wellas the number-, weight- and Z-average molecular weight are obtained.

得到这两类反应体系的K次和(K+1次高分子矩的递推公式,分别计算了两类反应体系0、1、2和3次高分子矩,进而得到了相应的数均,重均,Z均分子量。

Deficiency existed in the present calculation method of loan repayment period of fixed assets expenditure is analysied combining with a actual example. New idea and formula of calculating the peiod for each year is suggested. The result calculated in this formula can really show redeemability of the project.

结合实例分析了现行建设项目固定资产投资借款还期计算中存在的不足;提出了分别计算各年的借款偿还期的思路和计算公式,计算结果能较真实地反映项目的清偿能力。

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推荐网络例句

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上,利用各种方法求得各种逻辑型、结构型控制器,解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面,有讨论,工程理事会和联盟关于延长工作时间短至9月底。

What is the topic sentence of this article?

这篇文章中心的句子是那一句?