查询词典 mathematical models

How to study the corrosive factors of media corrosion in oil and gas gathering pipelines under the condition of multiphase flow is discussed and mathematical models are established. The effects of media flow rate, oxygen content, pH, salinity, temperature, pressure of CO2 and water content on 20(superscript #) tubular goods are introduced.

讨论了在多相流条件下如何对油田集输管线介质进行腐蚀因素研究并建立数学模型，研究了集输管线介质流速、含氧量、pH值、矿化度、温度、二氧化碳分压、含水共7个因素对20材管材的腐蚀影响趋势。

Based on the method of Computational Fluid Dynamics,the mathematical models of plate type and tube type of indirect evaporative cooler have been established.

基于计算流体力学方法，建立了板式和管式间接蒸发冷却器的数学物理模型，通过三维数值模拟得到了换热器一、二次空气通道的速度场、温度场和浓度场的分布。

The mathematical models established was suitable with the practical procedure, so the thread steel bar CARD system will have the better practicability.

本文理论结合实践，建立了与实际生产情况相适应的数学模型，使螺纹钢CARD系统具有更好的实用性。

This research job analysised the extending roll pass system the finish roll pass system and the ultimate roll groove. The mathematical models and experience formulations used for roll pass design are corrected according to the basic theory and the practical experience of the engineerings. The thread steel bar CARD was set up with the visual program tool-VisualBasic6.0, based on the method of the structural program design.

本课题通过对螺纹钢延伸孔型系统、精轧孔型系统及成品孔型的构成和设计方法的分析，结合螺纹钢孔型系统的基本设计理论和工程技术人员的实际生产经验，对以往孔型设计过程中所使用的数学模型、经验公式等进行了修正，以结构化程序设计方法为基础，采用可视化编程工具VisualBasic6.0建立了螺纹钢计算机辅助孔型设计系统。

O. Wilson and Charles Lumsden used mathematical models to arrive at what they call the "thousand-year rule."

威尔逊和查尔斯拉姆斯登利用数学模型发现了他们所谓的&千年规则&。

O. Wilson and Charles Lumsden used mathematical models to arrive at what they call the "thousand-year rule."

威尔逊( E.O.Wilson )和查尔斯·拉姆斯登利用精确的模型获得了他们所谓的&千年规则&。

By using the improved suction parameters containing polished rod stroke,pump plunger diameter and pump depth changed,the mathematical models of simulating system efficiency were developed according to coordination equation of well production.

根据油井产能协调关系，建立了油井抽汲参数调整后的系统效率仿真模型，开发了抽油机井系统效率仿真分析的计算机软件。

By setting up the mathematical models of the regulating objects （combusting heat transfer, heat utilization and storage, superheater and main steam pipe line）, by combining heat transfer function of regulating system and by selecting method of setting PID accoding to set attenuation index object, the corrections among PID and pulverized coal＇s caloric values are found. Now the PID can be set according to caloric values of the pulverized coal burned in the unit and the automatic control can be put into operation.

通过建立调节对象四个环节（燃烧传热过程、热量的利用和储存过程、过热器、主蒸汽管道）的数学模型，结合调节系统的传递函数，选用按给定衰减指数设定PID参数的方法，找出PID参数与煤粉热值的关系式，最终达到在机组燃烧不同热值的煤粉时可依据该方法设定不同的PID参数、并都能投自动的目的，从而有利于提高机组的稳定性，并可节约煤粉。

Dwarf bean ; pod ; seed ; development ; mathematical models

矮生菜豆；豆荚；种子；生长发育；数学模式

The sap flow density can be used to extrapolate stand water use by a series of mathematical models.

利用热脉冲技术测定单木液流通量，实时推算林分的实际耗水量。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。