查询词典 iterative computation

Hydro-turbine ; conduit system ; model ; transient stability computation

水轮机；输水系统；模型；暂态稳定计算

The algorithm minimizes the hardware requirements and computation complexities, but it has a bias of the notch frequency after convergence.

该算法运算简单，但收敛后存在陷波频率偏移的不足。

If be to have forum sale, need the labor power that computation costs, time reachs wage level, conversion gives the cost of an expenditure.

如果是进行论坛营销，则需要计算花费的人力，时间及工资水平，换算出所花费的费用。

In order to measure the evolutional process, the judgment formula of convex-concave and convergence power of evolutional grey sequence are deduced, and the computation and graph methods of evolutional grey iteration are designed.

本文提出了一种新的软件工程方法&竞赛软件工程&，这是一个软件质量进化度量的过程框架。为度量这个进化过程，鬃者推导出灰序列凸凹性判断公式和收敛阶公式，并设计出计算判别法和图解判别法。

The plastic deformation mechanism of the process is explained. The vector equations of the curved conical surface and the figure of the particle motion for the forming process of the bending tube are presented. The theoretical model of stress and strain fields of the forming process is deduced. The practical forming process of tubes of large diameter demonstrates the validity of the new type of design method of the ox-horned core bar and the computation formula of the length of the raw tube.

本文通过研究弯管成形瞬时应力、应变状态及演化过程，阐明了弯管成形过程受力变形特点及力学原理；提出了一种适合弯管变形分析的新单元及数值方法；建立了弯管成形过程应力、应变场&标准图象&；通过研究弯管成形过程金属流动规律及力学条件，阐明了本工艺塑性变形机理；建立了描述弯管成形过程的曲锥面向量方程及其质点运动学图象；推导了弯管成形过程应力、应变场理论模型；结合大口径弯管生产过程，验证了本文给出的新型牛角芯棒设计方法和管坯长度计算公式的正确性。

DNA computation falls into a cross field of biochemistry mathematics and computer, it covers an extensive range.

DNA 计算属于生物、化学、数学以及计算机等学科的一个交叉领域，其研究内容所涉及的范围很广。

Based on theoretical analysis and finite element computation on 852 alternatives, the paper discusses the rational permeability, depth, thickness and location of grout curtain in concrete dam foundation.

本文通过理论分析和各种方案(共852个)的有限元计算，对混凝土坝岩基灌浆帷幕的渗透性、深度、厚度和位置的合理性，进行了分析论证；并建立了均质无限深坝基帷幕后的相对水头值的经验公式。

Using the models, the author has also calculated the vibration response to high speed railway vehicles of three types travelling over simply-supported beam bridges with various span lengths respectively. Based on the analysis of the computation results, the concept of resonance velocity of a bridge under a high speed running vehicle is present, and it is pointed out that comparatively great vibration of bridges on high speed railways is caused by bridge resonance resulted from the static force pulsating. In a vehiclebridge coupling vibration system, the damping constant of the axle spring is the main factor affecting the response variable of bridge velocity resonance, and the influence of track irregularity on bridge vibration on high speed railways is rather smaller.

利用所建立的计算模型，计算了三种形式的高速铁路车辆通过各种跨度简支梁桥结构时的振动响应，对所得到的计算结果进行了详细的分析，提出了高速行车下桥梁共振速度的概念并指出高速铁路桥梁产生较大振动的原因是静力脉动引起桥梁共振造成的；通过研究车—桥耦合振动系统方程的参数后指出，在车—桥耦合振动系统中，车辆—系阻尼的大小是影响桥梁速度共振时响应大小的主要因素，轨道不平顺对高速铁路桥梁振动的影响较小。

Although they used the 3D modes of the deck in the determination of aerodynamic characters so that the mechanical coupling and aero-coupling between the modes can be depicted more correctly ; in order to reduce the computation effort, however, they still adopted the partial differential equation to characterize the buffeting motion of the deck modeled as a uniform beam.

尽管他们将桥面的三维振型应用于计算气动特性分析中，从而可以较真实地描述振型间的机械和气动耦合。但是为了减小计算规模，他们仍然是用均匀梁的偏微分方程来描述桥面的抖振运动。

Characterization of Reservoir Fluids Based on previous publications on this topic, a theoretically correct algorithm capable of predicting the phase behavior of reservoir fluids with much less number of pseudo-components had been developed, the new algorithm had been tested by experimental data, and the computation efficiency show reasonable improvement over previous publications 3 Mixing Rule for Non-Ideal Systems Previous publications on this topic had been reviewed, a new density independent mixing rule which can give a smooth transition from van der Waals rule to G〓 model had been developed, with this rule G〓 model could be directly incorporated into cubic equation of states, ad hoc treatment adopted and problems met by previous publications were avoided.

高度非理想体系的混合规则系统总结了该领域的进展，建立了新的混合规则，新混合规则能平滑地从VDW流体转变为溶液模型，可以直接应用原溶液模型的参数，与已发表的各类方法相比，新模型具有更坚实的理论基础；该混合规则可以在低温低压至高温高全程范围内关联和预测体系的相态行为，包括高度非理想的体系；该混合规则经过了实验数据的检验，结果显示新混合规则的预测能力优于WS混合规则。

However it can often be frust ating for a child when people are unable to pronounce their name.

但它往往可以令人沮丧的一个孩子当人们无法断言他们的名字。

All these compounds were obtained from this genus for the first time. Compound, 4-cumylphenol, was a new nature product.

所有化合物均为首次从本属海藻中分离得到，其中4cumylphenol为新天然产物。