Some smokers know that nicotine increases the brain activity pattern associated with relaxation and that in low doses it can stimulate certain nerve cells that produce feelings of alertness.
有些吸烟者知道尼古丁增强与精神放松有关的大脑活动模式，还知道小剂量的尼古丁能刺激产生机敏警觉感的神经细胞。
The relaxation time increases with distance between two porphyrin rings and the results provide an evidence of formation of the complex.
同时，随着两卟啉环的距离增大，电子自旋弛豫时间变长，证实了双铁卟啉络合物的形成。
The results show that the velocity and the relaxation peak of the attenuation moved to low frequencies, and the amplitude of the attenuation decreases, as the correlation length increases.
结果表明，当相关长度增大时，相速度的过渡带向低频方向移动，衰减的弛豫峰随相关长度的增大向低频方向移动，且幅度逐渐减小。
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