四元的

Seven kinds of antijamming methods,such as time correlated choice and field-of-view shrinkage, inertial track,real-time memory criterion,amplitude discrimination, pulse-width discrimination, pulse-amplitude time sequence discrimination and pulse-width amplitude discrimination for Counter-Infrared-Interference-Missile with the cross-shaped detector array are given.

介绍了四元正交探测器以及红外干扰弹的工作原理，对四元正交探测器导引系统抗红外干扰的7种方法(即时间相关选择和视场收缩技术、惯性跟踪机制、实时记忆准则、幅值鉴别法、脉冲宽度鉴别法、脉冲幅值序列鉴别法和脉冲宽度幅值鉴别法)等进行了讨论。

According to the experimental data,the equilibrium phase diagram and the physico-chem.

采用等温蒸发法研究了四元体系K+、Na+∥CO32-、HCO3--H2O 35℃相平衡及平衡液相的密度、电导率、折光率和pH值，测定了该四元体系在35℃条件下平衡溶液的浓度及物化性质。

We also give out Schur decomposition for normal quaternion matrix.

对四元数正规矩阵，给出了其Schur分解，使得对某些四元数矩阵的计算得到了进一步的简化。

Finite element methods are analyzed, where the stress is approximated by the discontinuous Raviart-Thomas element of lowestorder,and the velocity by the piecewise constant element,and the Lagranian multiplier by the trace space of the piecewise continuous linear element.

然后发展其有限元方法：对应四变量分别用间断型Raviart-Thomas最低阶元，分片常数元，连续线性元和连续线性元的迹空间，我们获得了稳定性和最优误差界，通过后处理办法，我们得到一个适合于计算的速度-压力格式，该格式可视为"mini"元方法的一个变形（本文格式中引用了局部投影算子）。

This paper adopts new algebra structure of quaternion matrix,to study how to apply a variety of iterative algorithm to quaternion linear systems.

本文通过引入四元数矩阵的新代数结构表示运算，研究如何将多种迭代算法应用于四元数线性系统上。

A conception of "standard quaternion" is proposed and its significance in attitude simulation is also discussed.

最后讨论了用四元数实现姿态描述惟一性的问题，并提出了"标准"四元数的概念。

Accordingly, it is also very important for quaternion matrix theory.

同样地，对于四元数体上矩阵的理论研究和计算而言，四元数矩阵分解也占有十分重要的地位。

These houses generally have a square十五六size, usually in monthly rent一百四五十yuan, 56 yuan per person per month to add the water and electricity for each unit of the Pentagon to seven angle, if there is cable TV subscription fees, toilet fees, one month down, one house at least monthly expenditure一百六七十million, more than close to 200 yuan.

这些房屋通常有十五六平方米大小，通常在每月租金一百四五十元， 56元，每人每月增加的水费，电费为每单位五角大楼至7角，如果有有线电视收费费，厕所费，一个月下来，一所房屋，至少每月支出一百六七十亿美元，超过近200万元。

We investigate mixed totally umbilical QR-submanifolds in a quaternionic space form and also study the pseudo-umbilical QR-submanifolds of a quaterninoic space form with some additional conditions.

考查四元数空间形式中混合型全拟脐QR子流形并研究了四元数空间形式中具有某种条件下的混合型伪脐QR子流形。

INS with single axis stablization is analyzed using quaternions, and system quaternions error model is worked out.

应用四元数方法分析了单轴稳定惯导系统，建立了系统的四元数误差模型。

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。