正矢

The basic idea is as follows: first, a kind of plane α-B-spline interpolation curve with a shape control parameter a is constructed; then, by converting the first derivatives of the curve into Bernstein polynomial, the positive conditions of Bernstein polynomial can be used to get the necessary and sufficie nt conditions for the monotonicity of α-B-spline interpolation curves, i.e., the range of the parameter a. Therefore, monotone-preserving interpolating curves can be obtained succinctly.

其基本思想是：首先构造带有形状可调参数的一类平面(-B样条插值曲线，再把其一阶导矢的两个分量分别转化为Bernstein多项式，从而利用Bernstein多项式的正性条件，得到此曲线为单调的充要条件，即形状参数的取值范围，简单、快捷地实现此参数样条曲线的保单调插值。

The cyclical pulse load consisting of a haversine load time and a rest period is adopted to simulate the actual vehicle load, and the permanent strain model under the repeated load is derived from the rheological and viscoelastic theories.

采用半正矢波间歇荷载模拟实际轮载作用，综合运用流变学和粘弹性力学理论推导了周期性荷载作用下沥青混合料永久变形的力学模型。

A loading cycle consisting of a haversine load followed by a rest period was adopted to simulate the actual vehicle loading on asphalt pavement, and a viscoelastic-damage mechanics model was deduced for permanent deformation of asphalt mixture under repeated load.

再采用半正矢波间歇荷载模拟实际路面轮载作用，推导了重复荷载作用下沥青混合料永久变形的弹黏塑性损伤力学模型。

The dependence of director orientation of positive dielectric anisotropy nematic liquid crystals on static electric field is discussed.

讨论了静电场对正介电各向异性的向列相液晶指向矢取向的影响。

BACKGROUND: It is very important to appreciate the Sagittal discrepancy during the diagnosis and therapy in orthodontics patients.

摘要背景：正确评价上下颌骨基骨的矢状位置关系在正畸患者的诊断和治疗过程中是十分重要的。

Objective To explore the indication, advantage and disadvantage of modified or classical technique of intraoral sagittal split ramus osteotomy for correction of mandibular prognathism.

Obwegeser(1957)和Dolpont(1961)创建的用于矫治下颌畸形的经典下颌升支矢状劈开截骨术(sagittal split ramus osteotomy，SSRO)被认为是正颌外科的里程碑。

In order to solve exactly the dynamic problems of the double coordinate coupling harmonic oscillators, the quantum unitary operator corresponding with classical canonical transformation is derived using the momentum eigenvector in Fock representation by constructing asymmetric integration.

为了精确求解双模坐标耦合谐振子体系的动力学问题，利用动量本征矢在Fock表象中的表示构造不对称积分，找到了与经典正则变换对应的量子么正算符。

In 1748,the works Analytical Institution of Maria Agnesi was published,in which a versed sine curve called by her name was well-known in the circle of mathematics.

玛丽娅·阿涅西；分析讲义；阿涅西曲线；慈善事业； 1748年阿涅西的著作《分析讲义》出版，其中一条以她名字命名的正矢曲线名扬数坛。

This model may be applied for the study of morphologic characteristics and changes induced by growth,orthodontic treatment and orthognathic operation on middle sagittal plane.

该模型可用于颅颌面硬组织在正中矢状面上的形态特征及因生长、正畸矫治、正颌手术引起的形态变化研究。

With minimizing the move distance as the optimization objective, the circular curve radius and circle center coordinate were then optimized, the transition curve length, the move distance of each measured points, the mileages and the coordinates of the feature points and so on were further computed.

首先利用坐标法计算各测点的坐标，再计算正矢，然后根据正矢的变化规律选定圆曲线上的测点，用最小二乘法拟合出既有线圆曲线的半径和圆心坐标，并以拨正量最小为优化目标，优化圆曲线半径及圆心，进而计算出缓和曲线的长度、各测点的拨正量、特征点的里程和坐标等。

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。