四元的

A ratio spectra derivative spectrophotometry for simultaneous determination of quaternary mixture of aminopyrine, phenobarbital, caffeine and phenacetin was studied.

提出了可应用于四元混合体系同时测定的比光谱-导数分光光度法，阐述了该方法的基本原理，并将其应用于氨基比林、苯巴比妥、咖啡因和非那西丁四元混合体系中各组分的同时测定。

After analysing the existing smooth orientation interpolation methods we proposed a smooth orientaion interpolation method based on cubic cardinal spline in quaternion space. This method possesses the following advantages: interpolation, C〓 continuity, accurate evaluation of the quaternion value at arbitrary parameter, transparent to the users, adjustable parameters for controlling the velocity of orientation change.

在分析现有的朝向光滑插值方法基础上，提出了基于四元数空间三次C样条的朝向光滑插值方法，该方法具有插值、C〓连续、任一参数处的四元数值可精确求得、对用户透明、可以用参数调节关键帧处物体朝向变化的速度等优点。

Utilizing the real representation of quaternion matrices and its characters discusses the reversibility of quaternion matrices and a account way of athwart matrix in this article.

3，利用四元数矩阵的实表示及其性质讨论了四元数矩阵的可逆性以及逆矩阵的一种计算方法

Calculation formula of quaternion integral initial values in simulation was put forward through quaternion to Euler angle conversion.

通过四元数到欧拉角的转换，给出了仿真中四元数的积分初值计算公式；分析了弹射仿真中姿态角的跳跃和间断问题。

In this paper, phase equilibria of quinary reciprocal system Li+, Na% KV/ C032. B4O72~-H2O and its subsystems (nine ternary systems and five quaternary systems) at 288K were studied by isothermal method; An experimental study on metastable equilibria at 288K in the quinary system was done by isothermal evaporation method, also.

采用等温溶解平衡法研究了五元体系Li~+，Na~+，K~+∥CO_3~(2-)，B_4O_7~(2-)—H_2O及其九个三元子体系、五个四元子体系288K相平衡关系；采用等温蒸发的方法研究了该五元体系288K介稳相平衡关系。

We work out generalized Schur decomposition of quaternion matrix pencil and give out a sufficient condition for simultaneous unitary diagonalization of two quaternion matrices.

2得到了四元数矩阵束的广义Schur分解及两四元数矩阵可同时酉对角化的一个充分条件。

Specifying a rotation directly as a quaternion is completely unintuitive, so what you\'ll want to do is convert quaternions to and from other representations.

四元数并不天生就具有旋转的特性，因此你还要做一些转换四元数或其它的一些必要工作。

The main technique applied in our method is derived from the features of the eight bit-planes of a gray image. The XOR bit-wise operation is used for two bit pixels among the neighboring bit-planes from the most significant bit to the least significant bit.

本提出方法是将欲隐藏之灰阶影像分解成八张位元平面，并利用其影像前几个位元平面0与1分布会有群聚现象，将两两位元平面间作XOR (Exclusive-or)运算，再使用线性四元树的观念将运算后的资料进行有效BFS编码，之后再隐藏於伪装图之像素最低位元，使最后藏入资料的伪装图影像仍呈现高度清晰的图像显示，也就是说PSNR的测度皆能远大於30dB。

The metal element powders were mixed proportionally with ZrB2/ZrC/SiC ceramic powders in the cylinder mill, then the quaternary ZrB2/ZrC/SiC+Me ceramics were prepared by hot-pressing mixed powders.

将金属元素粉按一定配比与ZrB2、ZrC和SiC陶瓷粉末混合后热压制备了ZrB2/ZrC/SiC+Me 四元陶瓷，重点研究了四元陶瓷的密度、弯曲强度、断裂韧性、烧蚀性能以及烧蚀前、后的微观组织。

As it is expected, the main obstacle in the study of quaternion matrices is the non-commutation in multiplication of quaternions.

实四元数矩阵研究的主要难点是四元数乘法的不可交换性。

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。