查询词典 cubic

With regard to the accuracy and smoothness of a set of discrete data points approximation, this paper gave a whole fairing and approximation algorithm of cubic Non-Uniform Rational B-Spline curve.

针对离散数据点序列的拟和精度及光顺度问题，提出了一种三次非均匀有理B样条曲线整体光顺逼近算法。

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。

By translating this real cubic system into a complex planar system, an applicable linear algebraic recursion formula of the equator and the first 6 quantities of the equator are given.

将这类实三次系统转化为复平面系统研究，给出了系统赤道环量的易于计算的线性代数递推公式。

In the last chapter, by introducing the isochronous center of real systems into complex planar and defining complex center and complex isochronous center, a concise linear recursion formula for period constants is given, necessary and sufficient conditions of complex isochronous center (the Time-Angle Difference Theorem) proved, conditions of real systems with linearizable center and saddle treated unitedly and the isochronous center conditions discussed fully for a class of real planar cubic systems.

在第七章，通过把实系统等时中心引入复平面研究，定义了复中心和复等时中心，给出了等时中心周期常数计算的简明的线性递推公式，证明了等时中心判定的充分必要条件，统一地处理了实系统具有可线性化的中心和鞍点条件，并对一类实平面三次系统的等时中心条件进行了完整研究。

Axisymmetric elasticity problem of cubic quasicrystal is reduced to a solution of a partial differential equation with higher-order by introducing displacement function .

本文通过引入位移函数使得立方准晶的轴对称弹性问题化为求解一高阶偏微分方程。

When the leakage reduced 1 billion cubic meters, the groundwater table would decreased more 1 meter than the normal.

随黄壁庄水库付坝加固工程的实施，渗漏补给量每年减少1亿m〓，比没有加固时，石家庄市区漏斗中心地下水位每年大约下降1m。

The goals for the project are by the year 2000, lumbering in all exclusively protected zones will be stopped, the timber output will be reduced to 15 million cubic meters, and overcutting will be stopped.

工程实施目标是，到2000年，完全停止禁伐区内的森林采伐，调减木材产量1500万立方米左右，同时，杜绝超限额采伐。

Cutting down trees will be banned in regions along the upper reaches of the Yangtze River and the upper and middle reaches of the Yellow River, with timber output reduced by about 20 million cubic metres.

加大长江上游、黄河中上游天然林保护工程的实施力度。长江上游，黄河中上游将禁止砍伐树木，从而木材产量将减少2000万立方米。

If the ecosan would be developed there, new industries could be promoted and 50-100 thousands of employing opportunities could be created, incidence rate of diseases could be reduced, 560 thousand cubic meters of methane could be recycled, investment of sanitary toilet could be reduced to an acceptable price, i.e., 600-750 RMB yuan per house, ecological agriculture could be developed, and pollutants discharge could be reduced while ecological security could be guaranteed.

若在该区域推广生态卫生，可能产生社会、经济及环境效益如下：带动新兴产业，增加5~10万的直接就业机会；降低疾病感染率；回收沼气56万立方公尺；卫生厕所投入控制在可接受的600~750元户^(-1)；促进生态农业循环；降低污染物排放、保障生态安全。

The hydroxylphenyl porphyrins have a large value of the reverse saturation absorption and a large cubic nonlinear refractivity.

实验结果表明，它们具有大的反饱和系数和三阶非线性折射率，并且取代基数目和取代位置对实验结果有明显的影响。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。