A novel bi-pyridine quaternary ammonium salt cationic surfactants was prepared by acrylic modified rosin.

The effects of different quaternary ammonium salts were studied.

研究了季铵盐的种类、结构对插层效果的影响.

It was pointed out that the quaternary ammonium salt was the most important phase transfer catalyst.

指出了此类合成反应中所采用的重要相转移催化剂是季铵盐类.

A quaternion can be used to represent any arbitrary rotation.

四元数可用来表现所有形式的旋转.

The norm of a quaternion is similar to that of a vector.

四元数的平均值与矢量的有点相似.

Two control laws are presented for attitude regulation of a rigid body expressed by quaternion.

给出了用四元数+表示的刚体姿态调节问题的两种控制规律.

Some inequalities of eigenvalues for weak cycle products of self-conjugate quaternion matrices are given.

给出了自共轭四元数矩阵的弱圈积的特征值的一些不等式.

In this paper, we obtain some inequalities for norm and traces of quaternion matrices.

本文获得了四元数矩阵的范数和迹的一些不等式,改进了近期的某些结果.

The method of adjusting screen-coordinate and object-coordinate of plane model with quaternion is discussed.

论述了以四元数法调整模型的屏幕坐标和物体坐标的方法.

It is realized by real quaternion overrides the weakness of matrix such as unintuitionistic, complex calculation.

此算法采用实四元数组实现,克服了采用矩阵实现时的非直观性 、 计算复杂等弱点.

Eight , design SAMPLE language grammar, semantic analyzer, the output quaternion type of intermediate results.

设计SAMPLE语言的语法 、 语义分析器, 输出四元式的中间结果.

Two control laws are presented for attitude regulation of a rigid body expressed by unit quaternion.

给出了用四元数表示的刚体姿态调节问题的两种控制规律.

Xiaoming likes Tang poetry very much , especially its quatrains.

小明喜欢读唐诗, 尤其是其中的绝句.

String Quartet No.30 in A major , Op. 93, Quatuor brillant.

大调第三十弦乐四重奏曲, 作品93, “灿烂四重奏曲”

To tremble quaver in sound , as of the voice or a musical note.

半音加两个符点, 时值等于三个四分音符或一个八分音符.

There was a quaver in Beryl's voice.

贝丽尔的声音有一丝颤抖.

You could hear the quaver in her voice.

她的声音中能听出有些颤抖.

There was the quaver in her voice as she said this.

她这么说时,声音几乎没有颤抖.

I quaver when speaking to large audiences.

对许多人讲话时我便会发颤.

To tremble or quaver in sound , as of the voice or a musical note.

时间量是全音符一半的一个音乐符号.

There was the least quaver in her voice as she said this.

"她这么说时,声音几乎没有颤抖.