数学模型

Our experimental results show that the optimal search strategy is efficient for information retrieval on structured database.

在数学上，计算非适应性搜索的最优化策略是可行的，因此我们把问题转化为非适应性搜索的数学模型。

Tenth. A series of mathematical model of genetic mechanism of common population have been established,they are mathematical description of genetic mechanism of common population, so the population that the population genetics researching have extended from panmixia population, inbreeding population,selfing population to common population. It will start the new research territory of population genetics and promote its development.

本文建立了普通群体遗传机制的一系列数学模型，这是对普通群体遗传机制的数学描述，它使群体遗传学所研究的群体由随机交配群体、近亲交配群体、自交群体扩展到普通群体。

This paper Puts forward the four main parameters of the Permeability classification for coal mass es, that is,the fractal dimension of the cracks in coal mass es,the number of the cracks in one meter's characteristic scale, the conducting water coefficient of coal samples and its Porousness; and founds the mathematical pattern of the complex judgement by fuzzy sets.

提出了进行煤体渗流特性分类的四个主要指标，即煤体裂隙分布的分形维数D、特征尺度L＝1m的裂隙条数N、煤样导水系数T和煤的孔隙率η等；建立了煤体渗流特性模糊数学综合评价的数学模型；根据煤层注水工程应用的实际情况。

The detection and prediction of chaos in time series of power systems are studied in this dissertation.

从使用的数学工具角度，混沌的研究可以利用电力系统的数学模型，或利用对实际电力系统采样得到的时间序列。

First of all, the physical properties of plastic projectile body influencing the motion of pro- jectile are analysed in this paper which depends on the test results.

本文以实验结果为依据，首先分析了塑料弹体影响弹丸膛内运动的物理性能，然后结合旋转弹丸的膛内运动特征，经过模拟试验，采用数学拟合法，初步建立旋转稳定弹塑料弹体工程设计计算的数学模型(包括结构尺寸设计计算、强度计算和内弹道计算)。

A tolerance analysis procedure based on homogeneous transform and Monte Carlo Simulation is proposed in this research. The propagation of variation in 3-D space is treated as propagation of errors during transformations of Cartesian frames, which are set up on the Key Characteristic Points.

通过定义车身装配坐标系统，根据微分运动的原理，建立了计算车身零部件位姿关系的数学模型，对典型公差语义的数学表达进行了研究；并应用蒙特卡洛模拟，对关键特征点偏差传播的统计特性进行了分析。

Transport system is a random nature, ambiguity and uncertainty of complex systems, the establishment of mathematical models very difficult and sometimes impossible to use existing mathematical methods described.

交通系统是一个具有随机性、模糊性和不确定性的复杂系统，建立数学模型非常困难，有时甚至无法用现有的数学方法加以描述。

Transport system is a random nature, ambiguity and uncertainty of complex systems, the establishment of mathematical models very difficult and sometimes impossble to use existing mathematical methods described.

交通系统是一个具有随机性、模糊性和不确定性的复杂系统，建立数学模型非常困难，有时甚至无法用现有的数学方法加以描述。

The results show that in the internal standard method the mathematical treatment of uniform distribution of NG in deterred layer has no effect on the order of magnitude of the diffusion coefficient, so the systematical deviations of the reconcentration profile obtained from the imperfection of calibration model can be neglected.

内标法与外标法的比对实验结果表明，在内标法中将钝感层硝化甘油做均匀分布的数学处理对扩散系数计算结果的数量级没有影响，因此由于数学模型的不完善带来的浓度分布曲线的系统偏差可以忽略不计。

Research methods: The comparison was made between regression analysis and curve's fitting by adopting comparison method.

用数学模型的形式表现劳动定额是通过数学方法和计算机实现劳动定额管理现代化的一种新的方法。

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％。