brief spin 中文意思是什麼
brief spin
解釋
短暫螺旋-
As it vaporizes, tiny gas jets spin and tumble the ice shards across the surface of the water. during their brief lifetimes, the dry ice shards collide and spin a multi - armed vortex of white mist
乾冰氣化時產生的小噴流帶動乾冰碎片在水面不斷旋轉翻滾，互相碰撞，產生一團團有多個分支的白霧旋渦。 -
During their brief lifetimes, the dry ice shards collide and spin a multi - armed vortex of white mist. they propel themselves around the tank leaving trailing wisps of water vapour similar in appearance to the tail of a comet
有些乾冰塊噴出的氣體所產生的反作用力，足以推著乾冰前進，使後面形成一條條水氣的流跡，好像彗星的尾巴。 -
It is the main purpose of this paper to calculate the energy splitting of ground state and excited states induced by thermally assisted quantum tunneling. first, a brief introduction is given for the theoretical and experimental studies on the magnetic macroscopic quantum effects. then, spin tunneling in a uniaxial ferromagnetic particle in transverse magnetic field is converted to a pseudoparticle moving in effective double - well potential with the help of the effective potential description of quantum spin systems developed by ulyanov and zaslavskii. finally using the periodic instanton method we evaluate the transition amplitude, energy shift and prefactor of wkb exponential and the energy splitting of ground state and the tunneling rate for excited states induced by thermally assisted quantum tunneling are obtained
文章首先對磁性宏觀量子效應的理論和實驗方面作了簡單介紹，然後藉助于ulyanov和zaslavskii發展的一種等效勢描述方法，把外磁場沿難磁化軸方向時的自旋隧穿約化成在等效雙勢阱中運動的粒子，利用瞬子方法給出基態能級劈裂，最後利用周期瞬子方法分別計算了隧穿幅、能級移動以及wkb前因子，從而給出由於熱助量子隧穿引起的激發態的隧穿率。 -
A brief introduction to semiconductor spintronics that includes magnetic semiconductor, magnetic / semiconductor compound structures, spin phenomena in the non - magnetic semiconductor quantum well and nanostructures, and spin injection into semiconductor etc. is given
摘要簡單介紹了半導體自旋電子學的研究對象和內容，主要包括磁性半導體、磁性半導體復合結構、非磁性半導體量子阱和納米結構中的自旋現象，以及半導體的自旋注入等。
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