A permutation group approach to a one dimensional Heisenberg open spin 12 chain with nearest neighbor interactions is studied.

利用置换群方法研究了具有邻近相互作用的一维海森堡自旋12开链模型。

youdao

MINUSES: the rotation is not perfectly even, the nose exits short of 12:00 straight up, and a fair amount of altitude is lost in the spin.

缺点：平转不够平衡，结束时机头不到12：00垂直向上，平转的过程丢失了相当数量的高度。

youdao

The media and your surroundings often put a negative 12 spin on things for various reasons.

媒体和周围环境会因种种原因对事情提出消极的论述。

youdao

"Daiei alone could spin off a dozen or so companies in the next 12 months, " says Smith.

FORBES: Gaijin grave dancers

Liberty Media's CEO, Greg Maffei, said Nov. 12, 2009, that it would be logical to spin out Liberty's stake in Sirius at some stage.

FORBES: Adviser Soapbox