模型理论

The author points out: if lots of the conflicts of philosophical foundation the 20th century's quantum mechanics faced with, well-known to everybody, should be logically attributed to the confusions of the some fundamental concepts in the classical electromagnetic field theory, the series of logic inconsistencies implied in the classical electromagnetic theory and the forms of difficulties the modern computational electromagnetism encounters while solving time-varying electromagnetic field should be also logically attributed to an anomalous fact that series of fundamental mathematical propositions relating with bispinor differential operator, which naturally appears in the formal expression about dynamic electromagnetic field, have not be solved really while the related complete mathematic physical models or well posed boundary value problems have not been built.

著者指出：如果说20世纪的量子力学之所以面对哲学基础众所周知的矛盾，在逻辑上最终不能不归咎于经典电磁场理论体系的一些基本概念并没有真正得到澄清的话，那么，经典电磁场理论体系隐含的众多逻辑不自洽问题与目前计算动态电磁场所面对的困境，则必须逻辑地归咎于与双旋度微分算子相关的一系列基本数学命题并没有解决，而相关的恰当数学物理模型至今没有真正建立起来的缘故。

Combustion of pulverized coal is simulated step by step. The simulation result in the blowpipe is used as the input of the raceway calculation. The way of simulations for the blowpipe and raceway is considered more close to practice. By using this model it is possible to improve the simulation accuracy.

第五章根据高炉喷吹煤粉燃烧特点，提出了煤粉在直吹管和风口回旋区的煤粉运动、热解、燃烧的联合数学模型，用此模型可以计算出高炉直吹管和回旋区内煤粉温度场、速度场、氧浓度场和煤粉的燃烧率，从而可对喷吹效果在理论上作出评价。

Some methods that are usually used now and their characteristics of bore-hole trajectory are introduced; Analysis the main factors which affect bore-hole trajectory; A model of rock-bit interaction is developed by accounting for the anisotropic drilling characteristics of both the formation and the bit; Base on the model of static behavior of a bottomhole assembly design a bore-hole trajectory; produce a demo of bore-hole trajectory base on 3DS Max.

本论文对井眼轨迹反演理论及方法作了简要的分类，介绍了几种目前常用的井眼轨迹反演方法及其特点；分析了影响井眼轨迹的主要因素；综合考虑地层和钻头的各向异性钻井特性，建立钻头与地层相互作用模型，基于钻柱底部组合力学模型设计出一条井眼轨迹；制作了基于3DS Max的井眼轨迹演示动画。

Through an in-depth analysis of modification theory for the top profile together with its purpose, the modification principle and the design principle of the discharge port are presented. The boundary curve equation of the maximal area of discharge port is deduced in theory and the corresponding mathematical model is established.

通过对齿端修正理论及目的的深入分析，确定了齿端修正的原则，并提出了型线齿端修正的涡旋压缩机排气孔的开设原则，详细分析了排气孔理论上最大开设区域，并推导了区域边界方程，建立了相应的数学模型。

Lots of empirical studies show that the actual processesand results of investors'decision-making are very different from that described byMFT's optimal investment decision-making model because of judgement anddecision biases arising from investors'psychological biases and informationasymmetry , investors'bounded rationality below the MFT's requirement.

大量的实证研究表明，实际中由于投资者固有的一些心理偏差和信息不对称的存在，使得投资者的认知能力和判断能力以及判断的准确度往往存在偏差，远远低于经典现代金融理论对投资者的理性要求，投资者的实际决策过程和决策结果与经典现代金融理论的最优投资决策模型所描述的大相径庭。

The theory of boundedness is one of important branches of differential equations.

常微分方程有界性理论是常微分方程理论中的一个十分重要的分支，它具有深刻的物理背景和数学模型。

On the basis of the constitution and work principle of general drum brake and the theory of heat transfer and finite element method, the process of heat's creating and dissipating is analyzed detailed, and the mathematics model of temperature rising calculation is built.

本文在对目前常用的鼓式制动器结构和工作原理进行分析的基础上，从传热学的基本理论出发，研究了鼓式制动器的生热、散热过程，并应用有限单元法建立了制动鼓温升过程的理论计算模型。

On the basis of some elementary theories about Galton-Watson branching process, the bisexual Galton-Watson branching process and the branching process with random environment are introduced in the paper.

本文在介绍GW分支过程一些基本理论的基础上，又介绍了两性分支过程模型及随机环境分支过程模型，并以两性分支过程为前提，研究了带配对函数L=x的两性分支过程{Z_n}。

The biased Brownian movement model is one of the important ways to describe the molecular motor walking along the track. The deficiency of this model is that motor is not capable of producing a sufficiently strong force and the efficiency of motor is very low.

偏布朗运动模型是描述分子马达沿轨道运动的主要理论之一，此类模型的不足之处是不能产生足够强的力，其效率不高。

Such a positivist method for economic research, marked by the close combination of th...

这种实证的经济研究方法能起到使理论与经济实践紧密结合的作用，并且能建立起有效的理论模型。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。