1) venation
[英][vi:'neiʃən] [美][vi'neʃən]
脉序
1.
On leaf shape and venation of Cercis L.(Leguminosae);
关于紫荆属(豆科)叶型和脉序的研究(英文)
2.
The leaf venation structure of 17 species and 1 variety of Piper Linn.
作者研究了华南地区胡椒属植物 1 7个种和 1个变种的脉序结构 ,并对其在种的鉴定上的意义及某些种的归并问题作了初步的探
3.
Comparative observation of epidermic and venational morphology of their leaves made by the authors proved that their epidermic and venational characteristics were obviously distinct, which may contribute as additional evidence necessary for the restitution as well as indentification of each individual genus and species.
对我国番荔枝科野独活属和囊瓣木属叶的解剖性状进行了系统比较观察，从叶表皮和脉序特征讨论了它们之间的分类关
2) nervation
[英][nə:'veiʃən] [美][nɝ'veʃən]
叶脉脉序
3) pulse sequence
脉冲序列
1.
Application of MR phase-contrast pulse sequence in thorax vasculature;
MR相位对比脉冲序列在胸部血管成像中的应用
2.
Optimization of NMR pulse sequences for metabonomics;
基于NMR代谢组学的脉冲序列优化
3.
In this paper,optimal radio freqency (RF) flip angle and relaxation delay time of the CRAZED pulse sequence for intermolecular multiple quantum coherences (iMQCs) of different order n were investigated.
对检测分子间多量子相干信号的CRAZED脉冲序列的最佳射频脉冲翻转角及延迟时间进行了探讨。
4) sequence pulse
时序脉冲
1.
The principle of sequence pulse combustion control is introduced.
介绍了时序脉冲燃烧控制技术的工作原理,与常规比例燃烧进行了比较,分析了时序脉冲燃烧的优势。
6) pulse series
脉冲序列
1.
Realization of the circuit measuring continuous pulse duration in pulse series;
脉冲序列中连续脉冲宽度测量电路的实现
2.
MOSFET can be explained and analyzed in many concepts and methods of Principles of Electric Circuits,such as voltage controlled current source,small signal analysis of nonlinear circuits,response of the first-order RC circuits excited by pulse series and frequency response characteristics of the dynamic circuits.
本文详细介绍了将MOSFET引入电路原理课程教学后与若干电路原理基本知识点联系的问题,包括压控电流源、非线性电路的小信号分析方法、脉冲序列作用下的一阶RC电路和动态电路的频率响应特性。
3.
When analyzing the spectrums of a pulse series vs the periodic signals, there is an interesting phenomenon ,that the energy of pulse series is distributed in a more broad band than that of the periodic signals.
周期信号与时域脉冲序列的频谱特点有明显差别,前者能量主要集中在一定的频段,后者能量分布较宽;二者傅立叶分解的余项收敛速度也有所不同。
补充资料：反转恢复脉冲序列
反转恢复脉冲序列
磁共振成像术语。磁共振成像的脉冲序列之一。磁共振成像中，在90°射频脉冲前增加一个180°脉冲，把净磁化矢量反转到Z轴上，间隔一段时间(反转时间，inversion time，TI)后再施加一个90°脉冲，将净磁化矢量倾斜到X-Y平面上，产生一个自由感应衰减(FID)信号，其后再加一个180°脉冲则可产生一个自旋回波信号。这样，IR序列既可收集自旋回波信号，又可收集FID信号。IR序列有三个参数，即TI、TR(重复时间)和TE(回波时间)。IR序列成像时可获得T1加权和质子密度加权像，也可用IR序列测量样本的T1值。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条