查询词典 mathematical approximation

On the base of building mathematical models of tractive performance and economic performance, synthetical optimization model of transmission parameters is presented;And building mathematical models of flexibility coefficient of correlative parame...

其次，基于动力传动系参数优化及分析模型的建立，结合MATLAB与Visual C++编程语言的各自优点，开发了一套基于PC机的动力传动系参数分析及优化设计软件。

On the basis of the mathematical models got by different measuring methods, a complete universal mathematical model was put forward by which different tappets lifts can be converted from one to another.

针对凸轮升程测量量具及方法不统一而造成升程转换困难及转换误差较大等问题，在研究凸轮升程各种测量方法数学模型的基础上，提出一个不同形式推杆升程相互转换的通用数学模型。

The dynamical and kinematic specialty of hydraulic hammer is analyzed during piling. At the same time, the mathematical model is presented of each process. Based on mathematical model of each stage, simulation and analysis is made. The changing rule of displacement, velocity, acceleration can come to a decision from simulation plot during falling process of pile hammer.

提出桩锤在各个打击过程中的数学模型，并对各阶段进行仿真及分析，研究桩锤下打过程中，桩锤位移、速度、加速度变化规律，为进一步研究生产样机提供了理论依据。

A 3D two-fluid model is also built in order to describe more accurately the fluid flow on distillation trays by comparing the computational results of quasi-single phase mathematical model with of two-fluid mathematical model.

本文采用有限体积法及计算流体力学软件&STAR-CD&对单块板以及首次对全回流下的全塔流体流动、传质过程进行了计算，计算结果如下：1。

The mathematical model of the system is divided into mathematical models of trawler, warp and fishing net, which are connected by boundary conditions reflecting the influence of each other. By using this modeling method, the dynamic simulation of the process of drawing in and giving out the fishing net is realized.

在建模过程中，将单船中层拖网系统的数学模型分为渔船、拖网曳纲以及网具系统的数学模型，并通过边界条件实现了数学模型之间的耦合，从而可以进行单船中层拖网作业过程中收放网过程的动态仿真。

This paper studies the mathematical simulation of the "properties-temperature" curve of ductile-brittle transition process for materials and finds the best mathematical model of ductile-brittle transition.

研究了Cr24Al2Si铁素体不锈钢韧脆转移过程的性能-温度曲线的数学模拟，找到了其最佳的韧脆转移数学模型。

The basic orientation of this auditing system and the database of fire protection law about high-rise building is established. And the problem how to audit the building fire design with the fire protection law is solved. Evacuation, fire water supply, smoke-preventing and fire power supply can be auditing in this system. On the base of this improvement, the mathematical result of the smoke-preventing air curtain is gained by using its mathematical mode.

本文对建筑防火设计审核系统的功能需求、系统设计、系统开发等基本问题进行了探讨，确立了系统的基本定位，建立了高层建筑的防火设计消防法规数据库，可对相应建筑的防火间距以及相应的消防法规进行查询，并解决了如何采用对照法规方法对建筑的防火设计进行审核的问题，可对建筑的消防布局、疏散距离、消防给水、防排烟系统和消防电气进行建筑防火设计审核。

Firstly, the relationship between the magnetic pole state of active magnetic pole and the running state of passive magnetic pole was analyzed. The electromagnet's four magnetic pole state and switch sequence, which can drive permanent magnet rotate, were ascertained. Secondly, taking one of magnetic pole state NS (N denotes electromagnet's left magnetic pole and S right magnetic pole) as an example, the distribution of space magnetic field was studied. In addition, the mathematical model of space magnetic field was set up based on the magnetic circuit fundamental and using the method of magnetic analysis and modeling. Lastly, the four states' mathematical model of space magnetic field was solved by using the MATLAB.

首先，分析系统主动磁极磁极状态和从动磁极转动状态之间的关系，确定驱动永磁体转动的电磁体4个磁极状态及切换顺序；其次，基于磁路基本原理，通过磁场分析和建模，以电磁体4个磁极状态之一的NS（N表示其左极、S为右极）为例，对电磁体的空间磁场分布进行研究并建立空间磁场数学模型；最后，以MATLAB为平台对4个磁极状态的空间磁场数学模型进行求解，将求解结果与实验数据进行对比。

In Introduction to Mathematical Philosophy, the later view as Russel refer to is about mathematical philosophy and foundations of mathematics.

罗素在《数学哲学导论》中所说的后1方向既数学哲学或数学基础。

The experiment results of φ460×600mm ball mill show that the mathematical models established with φ350×450mm ball mill have fair universality and adaptability. The established mathematical models can be applied to different size ball mills if the different coefficients are introduced.

460×600mm球磨机试验结果表明，在φ350×450mm球磨机上建立的数学模型具有一定的普遍性和适用性，只要引入不同的修正系数，即可将所建立的数学模型应用到不同规格的球磨机上。

Foods high in this vitamin include oily fish such as salmon, tuna and, and fish liver oils.

维生素D含量高的食物包括诸如大麻哈鱼、金枪鱼和鲭鱼之类的油鱼以及鱼肝油。

We need you to cosign our public letter demanding that press intimidation cease immediately, and that all charges be dropped.

我们需要您cosign我们的公共信，要求记者立即停止恐吓，并要求所有收费下降。