参数曲线

In present textbook,for curvilinear parameter equation,there is no defined methods to solve characteristic of graph ,copy methods and the area of self-closed planar graph .

在现行教材中，有关参数方程所示曲线的图像特点、描绘方法以及自身封闭所围成的平面图形的面积等都未给出明确的求法，为此，文中给出了关于曲线参数方程的两个教学注记，以弥补教材中的不足。

The program developed with the formula enable the coordinates for points and the parametric formula for curves in the orthographic projection to be transferred into ones in the axonometric projection, which can be directly displayed on the screen. In addition, except for assigned different values to elastic coefficient of the axial direction and the angles of the axes, it is generally adapted in drawing any of the axonometric projections.

用它编程，可以把正投影中点的坐标或曲线的参数方程，转换成屏幕上能够直接显示点的轴测投影的坐标或曲线的轴测投影的参数方程，而且除了赋轴向伸缩系数和轴间角的大小、正负不同的参数值外，对绘任一种轴测投影和相应正投影都具有通用性。

Input the equation and other related parameters of space curve of driving tine by the system interface, then the equation and other parameters of space curve of the conjugate driven tine could be given by automatic design and calculation in the system.

通过系统界面输入主动轮钩杆的空间曲线方程及其他有关参数，此系统可以自动设计计算得到与其共轭的从动轮钩杆的空间曲线方程及其他参数。

The priorities are the diversification characteristics of each targetin the subsequent water flooding. According to diversification characteristics of these targets,the paper studies how the heterogeneousness, water flooded condition, interconnectingcondition of zone;key measures injector parameters affect these targets from polymer floodingmechanism. Based on influence equations, production target prediction models are built usingHall curve theory, relative permeability curve, relations of water saturation and relativepermeability and material balance equation. Parameters of models are calculated by the way ofcomputer program and so that a simple, fast way have been gained to predict production targetof polymer subsequent flooding.

针对这些指标的变化特点，从聚合物驱油机理上分析其油层非均质性、油层水淹状况、油层连通状况、主要措施及注入参数等因素对这些指标的影响，在分流方程的基础上，利用霍尔曲线原理、相对渗透率曲线、含水饱和度与相对渗透率之间的关系以及物质平衡方程建立起开发指标预测模型，结合数学方法对模型参数进行计算，形成简便、快速、实用的聚合物驱后续水驱阶段开发指标预测方法。

The sensitivity,specificity,false positive rate,false negative rate and receiver operator characteristic area were e...

以培养结果作为金标准，应用受试者工作特征曲线确定iQ200和UF100各项参数的最佳临床判断界值，评价各项参数的灵敏度、特异度、假阳性率、假阴性率和ROC曲线下面积。

The problem of parametric speed approximation of a curve is raised in this paper.

该文提出了曲线的参数速度逼近问题，指出等距曲线逼近的关键在于参数速度的逼近，并用两种方式来实现它。

Returns the parametric extents of the curve.

返回曲线的参数，参数相当于曲线终点。

The new theory unifies a series of the single nonlinear strength theories for various concrete materials, which includes the whole region between the upper-limit Mises circular and the lower-limit SMP curve on the π plane of principal stress space, and the strength curves on the meridian plane are the exponential functions.

该理论在主应力空间的π平面上含盖了从下限SMP曲线到上限Mises圆之间的所有区域，子午面上的破坏曲线为幂函数形式；共有四个材料参数，均具有明确的物理意义，并给出了参数的确定方法。

In chapter 4, on the basis of academic analysis, an integrated experimentation project is designed, then experiments on eight electrodes respectively including hemisphere、ring、reticulation etc,and gains curves of diversified parameters with increase of current electrode, compares them with parameters of hemisphere electrode.

在第四章，文章以上一章的理论计算为基础设计了完整的模拟试验方案，然后对半球形、环形、棒形、网状、放射形等八种形状的电极分别进行试验，通过整理试验数据得出电流极数目增加时各组参数的变化曲线，分析曲线并将各参数的试验值与半球电极的理论值进行对比。

In order to contribute to analyse and compute easily setback moving devices on the projectile fuzes,and to make the fuze devisers be able to get the approximate acceleration curves with a few parameters such as tube length and muzzle velocity of the guns,the displacement-time curve and velocity-time curve of gun interior ballistic are fitted with the Logistic models,then the formula of projectile acceleration curves in bore are gotten by the derivation of the formula of fitting velocity-time curve.

为了便于炮弹引信后坐运动机构的分析和计算，能使引信工作者只根据身管长度和炮口速度等少量参数就能获得弹丸膛内加速度近似曲线，运用Logistic函数拟合火炮内弹道的位移－时间曲线和速度－时间曲线，再对拟合得到的速度－时间曲线求导便得到了弹丸膛内加速度近似曲线。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。