四元

Considering the influence of the layout of the attitude control, thruster forces are taken as the control input directly.

在对内动态分析的基础上，针对线性子系统设计了四元数PD反馈控制律。

The binary compounds, trinary compounds, four components compounds and full components compounds were also able to elicit higher EAG response, which were significantly higher than that of single component.

二元混合物、三元混合物、四元混合物和全组分的EAG反应较高，其EAG反应值均显著高于单组分的反应值。

A modified PID control law and an uncoupled variable structure control law all based on the error-quaternion are developed.

姿态控制系统研究：首先基于全局非奇异的误差四元数分别设计了改进的PID控制律和解耦变结构控制律。

Based on the unit quaternion decomposition of rotation matrix, this paper puts forward an algorithm to estimate motion parameters from the space position vectors of 3D feature points.

摘要本文基于旋转矩阵单位四元数分解定理，提出一种由3D特征点空间位置估计运动参数的算法。

The ellipse curre equation of circular image is derived based on the theory of spatial analytic geometry and rotation matrix s representation with unit quaternion then a mathematical model of the distortion error is established which relates the distortion error to the foca length of the used CCD camera,the radius as well as the position and the attitude of the inspected circle directly.

研究三维视觉检测中圆的中心经针孔摄像机成像后存在畸变误差的问题，首先基于空间解析几何理论和旋转矩阵的四元数表示法推导出像平面上投影椭圆的参数方程；然后根据参数方程建立圆中心成像畸变误差的数学模型；最后对影响畸变误差的主要因素进行分析。

If the norm is 1, you have a so-called unit quaternion (just as you would have a unit vector).

假如平均值为1，你就得到所谓的单位四元数。

The Vertex Shader ALU is a multi-threaded vector processor that operates on quad-float data.

顶点着色运算器是一个处理四元浮点数的多线程处理器。

Hydroxyapatite acerate nanoparticles with mean size ranging form 20~50nm are synthesized by the impinging stream devise using emulsion systems consisting of aqueous phase, cyclohexane as the oil phase and OP-10, n-octanol as the nonionic surfactant in definite pH value.

在一定pH值条件下，采用水溶液/环己烷/OP-10/正辛醇四元反相微乳液体系并结合撞击流技术制备出粒径为20~50nm的针状纳米羟基磷灰石晶体。

A new Antheraea pernyi variety Hulunbei'er 1 in bivoltine area in which breeding one generation for a year has been bred by the methods of pedigree separation and hybridization.

采用系统分离和杂交育种方法，育成了适合二化一放蚕区放养的柞蚕四元杂交新品种呼伦贝尔一号。

The endocyclic Sn atoms exist in a distorted triginal bipyramidal geometry with the coordination number of 5. The exocyclic Sn atoms form 6 significant bonds and exist in a distorted octahedron geometry.

化合物12的X衍射单晶测定表明，化合物是以Sn2O2四元环为中心的中心对称二聚体结构、内环锡为5配位的畸变三角双锥结构、外环锡为6配位的畸变八面体结构。

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。