查询词典 cubic curve

Then, an ideal random-packed-sphere model with simple cubic, body-centered cubic and face-centered cubic structures is presented to predicate the specific protonic and electronic conductivities of the catalyst layers. A correlation equation of the specific conductivity is obtained and the model is validated by the good agreement between the calculations and the measured data.

然后，分别用简单立方、体心立方和面心立方三种自由堆积球结构首次建立了描述催化层有效质子和电子传导率的理论预测模型，分析了电解质本体电导率、球半径、接触系数和接触角对质子传导的影响，得出催化层有效质子和电子传导率的计算公式，模拟结果与实验数据吻合良好，证实了模型的有效性。

In a natural state, the Junggar Basin, inland river sub - 4 Drainage District:(1) Buluntuohai water; Health ulungur water, out of Yamaguchi average annual runoff of 11.3 billion cubic meters, the last 10 years into the lake for many years for the most amount of 600 million cubic meters, most juveniles is only B 01.5 billion cubic meters; in 1970 from Elgin Qi period after the introduction of part of the river water, B the amount of water level decline eased Buluntuohai.

在自然状态下，准噶尔盆地的内陆河分为4个排水区：（1）布伦托海水系；汇乌伦古河水量，出山口平均年径流量113亿立方米，最近10年入湖水量最多年为6亿立方米，最B少年仅015亿立方米；1970年后从额尔齐期河引进部分水B量，缓和了布伦托海的水位下降。

Plateau basin surrounding karst groundwater resources to strengthen the investigation and identify the volume of 998 million cubic meters of mined / year; Southwest karst areas to 180 billion cubic meters of underground water resources / year, the volume of 77 billion cubic meters of mined / year; Southwest completed eight provinces 339 counties 740,000 square kilometres trees remote sensing surveys; Preliminary identification of the geological environment of the Yellow River source region ecological conditions change, first proposed the freezing cold caused a drop in water level at Sheung Shui and Yuen district water meadow degradation of the important reasons for the deterioration of the environment.

加强鄂尔多斯盆地周边岩溶地下水资源的调查，查明可开采量9.98亿立方米／年；西南岩溶地区的地下水资源为1800亿立方米／年，可开采量770亿立方米／年；完成西南八省339个县74万平方公里石漠化遥感调查；初步查明了黄河源区生态地质环境变化状况，首次提出冻结层上水水位下降是造成高寒草甸退化和源区水环境恶化的重要原因。

This algorithm firstly translates arbitrary parameter curves into the piecewise cubic-degree Bezier curves, then using the properties of Bezier curve we can get the tangent vector and the normal vector of every point on the approximation curve, and calculate the approximating offset curve.

此算法先将任意形式的参数曲线转化成分段三次Bézier曲线，利用Bézier曲线的性质容易得到逼近曲线的切向量和法向量，从而计算出其等距逼近曲线。

In order to overcome these weaknesses, we use quartic B-spline structure the yield curve, which indicates the less node cubic B-spline model is better under the situation that do not use the forward rate curve, if need to make use of forward rate curve to carry on the economy analysis, the suggestion use quartic B-spline method.

为克服这些缺点，我们用四次B-样条构造收益率曲线，实证表明能克服三次B-样条曲线上述缺点。因此，在不使用远期利率曲线情况下较少节点的三次样条模型是较好选择，当需要利用远期利率曲线进行经济分析时，建议使用四次B-样条法。

Further, it is found that the limit curve is a uniform rational cubic B-spline curve or the curve's control polygon when its tension parameters tend to zero or infinity respectively.

Barsky[4 ] 将具有张力参数样条的双曲样条曲线引入CAGD ，称之为张力样条参数曲线，并证明了这种曲线是一类泛函问题的极小解。

This paper adopts the method of double cubic B-Spline curved surface modeling based on cubic B-Spline curve,and comes out its matrix expression.

自由曲面的数据一般是由各截面型线给出的，数据用离散点组成的列表数据表示，给定型值点的自由曲面型

Therefore at each time we get the roots of this cubic equation, we can decide if we keep or reject each root according to the continuity of the curved surface, the method is as follows: If , the relative cubic plane curve is just a circle, this circle can be gotten by solving .

因此在每次求得该一元三次方程的解时，我们根据曲面的连续性来判断这些根的取舍，方法如下：在处，所得的平面曲线就是圆截线，该圆截线可以由相截得到，即。

At and , we can get a univariate cubic equation in and its three roots . By the dependence of the roots and the coefficients of the equation, we can choose corresponding space points ( such that the distance is the shortest from to the point with parameters and . Thereby we can get all the data of discrete points on the cubic curve of blending surface at . Again we denote the maximum value and minimum value of planar parameter with which meets by and respectively.

利用根与系数的连续相依性，可以选相应的空间点使其距离的圆截线上对应值的点最近的两个根，从而得到处拼接曲面的截线的离散点的数据并确定出与相截的平面参数的最大最小值类似地由处拼接曲面截线的离散数据得到处的离散数据，这样可以依次计算出拼接曲面上对应所有参数点的离散点的坐标。

This is a detailed introduction cubic spline curve function of the thesis, dissertation the main speaker of the cubic spline function of the mathematical foundations and algorithm description.

详细说明：这是一篇详细介绍三次样条曲线函数的论文，论文主要讲了三次样条函数的数学基础及算法说明。

Objective:To explore the feasibility of laparoscopy in diagnosing and treating of abdominal diseases.

目的：探讨腹腔镜用以诊断腹部外科疾病及选择治疗方案的可行性。

The lifetime of nylon 1010 and nylon 1010/POSS composites decreased with increasing temperature.

热重-红外联用分析表明尼龙1010在氮气气氛下的降解产物主要为小分子的低聚物，POSS并不改变尼龙1010降解产物的组成。