Fluctuation and dissipation in liquid-crystal electroconvection.
Fluctuation and dissipation in liquid-crystal electroconvection.
复制标题
液晶电对流中的波动和耗散。
DOI：
10.1103/physrevlett.87.245502
复制
发表时间：
2001
影响因子：
8.6
通讯作者：
H. Kellay
中科院分区：
文献类型：
--
作者：
W. Goldburg;Y. Goldschmidt;H. Kellay
在这个实验中，通过液晶薄膜维持稳态电流。当施加的电压通过阈值增加时，观察到相变，其特征在于由辊的混沌运动的对流状态。在阈值以上，观察到功耗的增加，这表现为平均电导率的增加。观察到以上的过渡的功率波动的平均功率耗散的比率急剧增加。这个比例相比，预测的波动定理的Gallavotti和科恩使用的有效温度与辊的混沌运动。
In this experiment a steady-state current is maintained through a liquid-crystal thin film. When the applied voltage is increased through a threshold, a phase transition is observed to a convective state characterized by the chaotic motion of rolls. Above the threshold, an increase in power consumption is observed that is manifested by an increase in the mean conductivity. A sharp increase in the ratio of the power fluctuations to the mean power dissipated is observed above the transition. This ratio is compared to the predictions of the fluctuation theorem of Gallavotti and Cohen using an effective temperature associated with the rolls' chaotic motion.