参数假设

In the spline interpolation for well trajectory ,each coordinate of the well trajectory can be indicated as a 3-order spline which variated with well depth.

在计算实钻井眼轨迹的样条插值法中，假设井眼轨迹的每个坐标分量都可以表示成以井深为参数的分段三次样条函数。

For the application of Mathematica in the differential geometry,this paper introduces how to processe the curve curvature and the torsion questions,the graphic expression of the curvature and the torsions,and draw curves by the curvature and the torsions. Curvature ; torsion ; solution curve ; osculating plane ; natural parameter ; natural equation

利用Mathematica，只要输入有关系统命令就可以得到期望的结果。1曲率和挠率及其图形意义假设R3上的曲线一般参数表示为r=r它的曲率和挠率计算公式是：κ=‖r′×r&‖‖r′‖3τ=‖r′×r‖我们知道，空间曲线r=r在一点(s=s0)邻近的近似方程为ξ=sη=120κs2ζ=160κ0τs3通过近似方程可以确定曲线在其基本三棱形的三个平面(即密切平面，法平面，从切平面)上的投

Of course, it is important to note that the quality factor shown is not an accurate measure of image quality since they are only truly comparable quantities if both Save for Web and Save As were based on linear scalings of the quantization tables included in the JPEG Standard Annex.

当然，有必要指出，质量系数不是测量图片质量的精确标准，只是假设另存为网页格式和另存为都是基于jpeg标准附录中的量化表的线性测量，那么质量系数是唯一能用来比较图片质量的参数。

The reactionsystem of polyesterification of DFA and EG was analyzed and simplified. Based on thehypothesis of equal and unequal activity of the end-group of monomer and polymer,the modelⅠand modelⅡfor estimating kinetic parameters were established usingimproved Genetic Algorithm, which was so improved by introducing the Elitist Model,Simulate annealing, Runge-Kutta method, proportional distribution randomizer etc.into the operators, and these models were more compatible with the estimation ofcomplex reaction kinetic model parameters.

对二聚脂肪酸与乙二醇缩聚反应体系进行了分析和简化，基于单体和聚合物端基等活性及不等活性的假设，采用已加入最优保存策略、变量数值扰动、龙格库塔积分(Runge-Kutta)算法、均匀分布的随机数发生器算子的遗传算法，建立了模型Ⅰ和模型Ⅱ，并利用C~计算机语言编程来估算动力学模型的参数。

The probability distribution function and the corresponding statistical parameters of sharing ratio of internal pressure in bedrock for embedded penstocks in terms of design reference per.

根据已搜集到的国内外部分水电站地下埋管围岩内压分担率的实测数据，利用统计数学中的K-S法和A-D法等检验方法进行了统计分析和分布假设检验，求得了水电站地下埋管围岩内压分担率在设计基准期内的概率分布函数及其统计参数，证明其最优概率分布函数可用对数正态分布来拟合。

Assuming the angular velocity of the beam is given as a harmonic function of time, the rotating sandwich beam is regarded as a parametrically excited system.

假设电流变夹层梁绕固定轴线做随时间变化的简谐周期运动，将变速度转动梁作为一个时变参激振动系统，分析了不同结构和控制参数对失稳区域的影响。

Topics include: sample spaces, axioms of probability, conditional probability and independence, discrete and continuous random variables, jointly distributed random variables, characteristics of random variables, law of large numbers and central limit theorem, basic experimental design, elementary probability, binomial and normal distributions, estimation and test of hypotheses, and analysis of variance.

概率论部分作为基础知识，是全部内容的重点之一，为读者提供必要的理论基础；数理统计部分，主要介绍常用的统计推断方法：参数估计、假设检验、方差分析、回归和相关分析等内容。

By importing anisotropic parameters, quantitatively achieved coal beds'anisotropies, and found that most coal beds adapt to weak anisotropic theory.

通过引入各向异性参数，定量计算了煤层的各向异性参数值，发现煤层在多数情况下满足弱各向异性假设。

The hydrologists often use a graphical or numerical method to analyze pumping test data for estimating aquifer parameters based on the homogeneity assumption.

过去在检定地下水含水层的参数，大多利用抽水试验，再以图解法或数值方法来分析泄降数据以推求参数值，但这些方法皆假设水层为均质。

Simply assuming that under different conditions, gene expression levels have three regulation states, i.e., up-regulation, down-regulation and non-regulation states, we can probabilistically establish a model of gene regulation states to compute gene regulation probabilities under different conditions.

简单假设在两种不同的实验条件下被调控的基因表达水平表现为三种调控状态，即上调控状态、下调控状态和非显著调控状态，我们使用概率统计方法对基因调控状态进行建模。在该模型的基础上，我们应用三种参数概率估计方法对基因调控概率进行估计。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐