1) spin excitation spectrum
自旋激发谱
2) the excitation spectrum
自旋波激发谱
1.
At the long- wave limit,three branches of the excitation spectrum behave like k2 .
应用三子格的自旋波理论和格林函数方法研究了由掺杂形成的准一维自旋1/2的反铁磁海森堡系统,得到系统存在3支自旋波激发谱,其中1支没有能隙,2支有能隙;在长波近似下,这3支自旋波激发谱与波矢k成平方关系,系统的低温比热为C∝T1/2关系,其基态具有磁性长程序,这都不同于未掺杂的一维自旋1/2的反铁磁海森堡链模型系统。
3) spin wave excitation
自旋波激发
1.
According to the dispersion relation of ferromagnetic granular film from spin wave excitation and spin-polarized excitation, taking the Fe-SiO2 granular film as a case, the spin wave excitation spectrum is independent of temperature, but the spin-polarized excitation dispersion spectrum is dependent of;and both increase with the wave vector increasing which is discontinuous.
应用颗粒膜中颗粒自旋波激发和自旋极化激发的色散关系表达式,对Fe-SiO2颗粒膜进行了计算,探讨其色散规律。
4) spin excitation delay
自旋激发弛豫
1.
The spin excitation delay for granular films with ferromagnetic granules;
含铁磁颗粒的颗粒膜自旋激发弛豫研究
5) spin-polarized excitation
自旋极化激发
1.
According to the dispersion relation of ferromagnetic granular film from spin wave excitation and spin-polarized excitation, taking the Fe-SiO2 granular film as a case, the spin wave excitation spectrum is independent of temperature, but the spin-polarized excitation dispersion spectrum is dependent of;and both increase with the wave vector increasing which is discontinuous.
应用颗粒膜中颗粒自旋波激发和自旋极化激发的色散关系表达式,对Fe-SiO2颗粒膜进行了计算,探讨其色散规律。
6) Single shot fast spin echo
单次激发快速自旋回波
1.
Single shot fast spin echo (SSFSE) MRCP was performed on a GE 1.
方法300例无胰腺及相关病史者,用单次激发快速自旋回波序列,沿胰腺头、体、尾一系列多层多角度斜位厚层采集,观察各段胰管显示情况及走行。
补充资料：自旋-自旋弛豫
自旋-自旋弛豫
磁共振成像术语。又称T2弛豫或横向弛豫(transverse relaxation)，指垂直于外磁场B0方向的磁化矢量的指数性衰减过程。磁共振成像时，对置于外磁场B0中的自旋系统施加90°射频脉冲，则自旋系统被激励，其净磁化矢量指向与外磁场B0垂直；射频脉冲终止后，被激励的质子与邻近的原子核之间发生相互作用，逐渐失去相位，净磁化矢量指向恢复与外磁场平行，该过程称自旋-自旋弛豫。自旋-自旋弛豫过程无能量交换。
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