四元法

This proves that the calculating results of streamline strip element method are reliable, and satisfied with demands from engineer work.

关于300mm四辊冷带轧机轧制铝带压力摩擦力张力和1850mm六辊CVC冷带轧机轧制铝合金带前张力横向分布的计算结果与实验结果吻合较好，证明了该流线条元法计算结果可靠，可满足工程实际要求。

This paper proposes a flexible and reliable camera calibration of stereo vision measurement system based on unit quaternions with optical reference bar, which has three small collinear infrared LED feature points and the lengths between these feature points have been precisely calibrated.

提出了一种利用光学参考棒，基于单位四元数法的灵活、有效的立体视觉测量系统现场校准技术。

Based on the data analysis of earthquake disasters in Sichuan-Yunnan region,the tendency of the next strong earthquake is predicted by commensurability of ternary,quaternion and quintuple,for the purpose of disaster prevention and reduction.

在对川滇地区强震灾害数据分析的基础上，应用三元、四元、五元可公度法分别预测了该地区下次可能发生强震的趋势，以便能更好地配合防震减灾工作。

The updating algorithm of Strapdown matrix is one of the crucial techniques of SINS. There are several kinds of attitude updating algorithms of SINS, such as direction cosine algorithm and quaternion algorithm.

捷联矩阵更新算法是捷联系统的关键技术之一，捷联惯导系统姿态算法有欧拉角法、方向余弦法、四元数法和圆锥补偿算法等几种方法。

Likewise,the axile potential and intensity of the system were calculated by Gauss elimination method and cubic spline interpolation.Furthermore,the electronic trajectory was traced by the changing steps Runge-Kutta method,the final size of e-beam about anode was true of demand.

在此基础上，通过Gauss消元法和三次样条插值法等解得了系统对称轴上电位分布以及内部场强分布，并利用四阶Runge-Kutta法追踪了电子从阴极开始到阳极入口处的运动轨迹且得到了合适的束斑大小。

Finally the advantages of quaternion method over Euler met...

最后讨论了四元数法优于欧拉法之处。

In this paper, phase equilibria of quinary reciprocal system K~+, Na~+//CO_~(2-), SO_4~(2-), B_4O_7~(2-)-H_2O and its subsystems (two ternary systems and three quaternary systems) at 273 K were studied by isothermal evaporation method .

采用等温蒸发法研究了五元体系K~+，Na~+／／CO_3~(2-)，SO_4~(2-)，B_4O+7~(2-)-H_2O及其中两个三元子体系、三个四元子体系273 K相平衡关系。

The attitude updating accuracy of quaternion algorithm and equivalent rotating vector algorithm was compared.

对四元数法和等效转动矢量法的滚转弹姿态解算精度进行比较，并通过打击机动目标的仿真试验验证了姿态解算精度对制导精度的影响。

The sporophore of Cordyceps militaris and the cordycepin content of intermediate products were monitored in the whole course according to the relation between fixed and mobile phases of solvents in a combination system of binary and quaternary solvents, in which the applied methods were successively supercritical fluid extraction, alcohol sedimentation, low-pressure normal-phase silica-gel chromatography, reversed-phase high-performance liquid chromatography and fractional crystallization.

根据溶剂的固定相与流动相之间的相对关系，采用了二元和四元组合的溶剂系统，顺次采用超临界流体萃取法、醇沉法、低压正相硅胶色谱法、反相高效制备液相色谱法、分步结晶法和反相高效液相色谱法，子实体及其中间产物中的虫草素含量变化情况。

A multi-objective property assessment of the effects of industrial waste-water management is discussed concerning economy, the environment and management capacily. Four assessment methods: the method of fuzzy elements approaching to an ideal solution, the Blin method, the oscillating value method, and the fuzzy optimization method, are also discussed.

论述了区域内工业废水治理效果评价的经济、环境和污水处理能力的多目标性，探讨了逼近于理想解的模糊物元法、Blin法、密切值法和模糊优选法等四种多目标优选评价方法。

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。