This paper analyzes the anomalous power-law dependence of the ultrasound attenuation on frequency by means of a percolation model. It was suggested that the anomaLous ultrasound attenuation is associated with strongly...This paper analyzes the anomalous power-law dependence of the ultrasound attenuation on frequency by means of a percolation model. It was suggested that the anomaLous ultrasound attenuation is associated with strongly localized eigen modes (to be called fracton) in disordered systems. There exits a steplike increase in the density of vibrational states at crossover frequency ω(co).Computer simulation of vibration spectrum in disordered system is also reported. The density of vibrational states is consistent with the results of relevant experiment outlined above.展开更多
提出固→液玻璃化转变中,大分子的内旋转运动模式与温度无关,链段和链段集团的内旋转能来源于大分子链间Van der waals力场中的不依赖温度的极化能。Lennard-Jones函数存在不动点,表明:固→液玻璃化转变中存在沿两相邻粒子(基元)空间位...提出固→液玻璃化转变中,大分子的内旋转运动模式与温度无关,链段和链段集团的内旋转能来源于大分子链间Van der waals力场中的不依赖温度的极化能。Lennard-Jones函数存在不动点,表明:固→液玻璃化转变中存在沿两相邻粒子(基元)空间位形方向的稳定的分形极化结构,它决定了从小到大的相互渗透,相互重叠的两体运动集团的演化途径。提出了玻璃化转变的反串级涡旋运动模式。展开更多
文摘This paper analyzes the anomalous power-law dependence of the ultrasound attenuation on frequency by means of a percolation model. It was suggested that the anomaLous ultrasound attenuation is associated with strongly localized eigen modes (to be called fracton) in disordered systems. There exits a steplike increase in the density of vibrational states at crossover frequency ω(co).Computer simulation of vibration spectrum in disordered system is also reported. The density of vibrational states is consistent with the results of relevant experiment outlined above.
文摘提出固→液玻璃化转变中,大分子的内旋转运动模式与温度无关,链段和链段集团的内旋转能来源于大分子链间Van der waals力场中的不依赖温度的极化能。Lennard-Jones函数存在不动点,表明:固→液玻璃化转变中存在沿两相邻粒子(基元)空间位形方向的稳定的分形极化结构,它决定了从小到大的相互渗透,相互重叠的两体运动集团的演化途径。提出了玻璃化转变的反串级涡旋运动模式。
