查询词典 mathematical models

After studying many domestic and abroad papers, the paper follows the recent study of optimal design and organization of gathering pipeline system. According to working condition of natural gas gathering pipeline system in west part of Sichuan.Based on topology, geography conditions of the gas field and different exploitive phase establishing optimal structure parameter mathematical models of pipe network. The object of models is net present investment value of pipe network.

本文调研了国内外大量文献，紧跟国内外天然气管网系统优化设计及运行方面的最新研究成果，结合天然气集输配管网系统的实际运行状况，采用分级优化法，开展集输站场优化布局研究、集输管网结构优化研究、地面输送系统优化运行研究等方面的深入研究。

Mathematical models of shearer parameters and noise of coal working face, shearer parameters and temperature of coal working face were established according to appropriate hypothesis and predigestion. Based on established models, corresponding simulation programs were compiled, and simulation research was proceeded.

通过必要的假设与简化，建立了采煤机参数与工作面噪声和温升之间关系的数学模型，编制了相应的计算机模拟程序，利用所建模型进行了模拟研究。

Based on the structure of a digital electronic-pneumatic cabin pressure control system, mathematical models are established. The models include the cabin, the controller and the outflow valve.

在分析数字电子气动式座舱压力控制系统结构的基础上，建立了座舱及控制系统中执行机构各部件的数学模型。

Methods Two mathematical models were created for preoperative planning of the ablation in spherical tumors. The models were based on the overlapping sphere principle and were deduced and calculated by the regular prism way and regular polyhedron way.

将肿瘤模式化为类球体，根据球体覆盖原理建立数学模型，应用正棱柱法及正多面体法进行推导计算，获得治疗范围与射频针伞径、布针次数的关系式。

The research results show that renewal theory can be used to direct the policymaker of the vehicle maintenance and repair and it is very effective to simplify the mathematical models and the solutions to the models.

研究结果显示：更新理论完全可用于指导车辆的维修决策，而且对简化问题的数学模型及模型的解非常有效；运行试验的验证结果表明，基于更新理论和更新函数所建立的车辆最优维护周期数学模型的解是准确、可靠且符合实际的。

The tasks of establish mathematical models of power system bases on similarity principle to construct mathematic description of the models.

本文主要研究的数学模型包括，发电机系统、原动机系统、系统网络与故障、静态和动态负荷、潮流计算。

The mathematical models of simultaneous design have been constructed using Taylor series, the models are suitable to the design of different monitoring systems.

运用Taylor展式，构造了同步设计的数学模型，适于各种监测系统的设计。

By simulating the flows over a series of submarine models, which are created by our mathematical method through changing the parameters of hull form, the viscous resistances of these submarine models can be predicted, so"submarine viscous resistance numerical test tank"can be founded.

运用我们提出的实用艇型自动生成程序，变化相关的艇型参数，建立系列艇型，通过数值计算，得到这些艇型的水下阻力系数，初步建立了"潜艇水下阻力数值试验水池"。

Utilized the correlative knowledge of mathematics and theoretical mechanics, the movement measure of the rolling forming of rectangle ring have been studied that based on the ring rolling theory. And the corresponding geometrical models and mathematical models have been established. It was revealed the variation law of ring in the cold rolling process.With the rolling processing, the inside and outside diameters of ring gradually increased with the cures similarly hyperbolic and the augment speed of the inside diameter was obviously larger than the augment speed of the outside diameter. With the rolling processing, the displacement, speed and acceleration of the ring centre gradually increased in the feeding direction in the horizontal and vertical ring rolling mill. With the rolling processing, the moment of inertia which ring reeled its centre and the whirligig of ring gradually increased. It caused the rotary speed gradually decreased. And it was benefit to decrease the circle tolerance and improve the precision of final molding.

本文基于环件轧制理论，运用相关的数学知识和理论力学知识，研究了冷轧过程中矩形截面环件轧制成形的运动测量，并建立相关的几何模型和数学模型，揭示了冷轧过程中环件的变化规律：随着轧制过程的进行，环件的内外径随类似于双曲线的曲线逐渐增大，且环件内径增大速度大于外径增大速度；在卧式轧环机和立式轧环机下，随着轧制过程的进行，环件中心的位移、速度及加速度不断增大；随着轧制过程的进行，环件绕其中心的转动惯量不断增大，导致环件的转速不断减小，这样有利于环件的整圆和最终成形环件的精度。

The conventional study is based on mathematical models of process. Because of complexity of fault occured, it is difficult to run and dualize rigorous models. Hence, the troubleshooting isn't straight and easy to implement.

正因为如此，国内外对蒸馏过程故障诊断进行很多的研究，但多采用传统的建立过程数学模型的方法，由于过程工艺流程的复杂性，难以建立准确的数学模型，无法对故障作出直接、准确的诊断。

Salt is good, but if the salt becomes flat and tasteless, with what do you season it?

14：33 盐本是好的，盐若失了味，可用什么叫它再咸呢？

He reiterated that the PLA is an army of the people under the leadership of the Communist Party of China.

他重申，人民解放军是在中国共产党领导下的人民军队。