噪声是影响Duffing振子相态跃迁的重要因素,其结果导致Duffing检测可靠性降低,从而影响其在实际工程中的应用。为此,提出了一种含强非线性阻尼项的广义Van der Pol振子相态跃迁模型,从理论上证明了其用于弱信号检测的可行性。与经典Duff...噪声是影响Duffing振子相态跃迁的重要因素,其结果导致Duffing检测可靠性降低,从而影响其在实际工程中的应用。为此,提出了一种含强非线性阻尼项的广义Van der Pol振子相态跃迁模型,从理论上证明了其用于弱信号检测的可行性。与经典Duffing振子相比,新模型具有更强的状态稳定性和噪声免疫性。仿真实验表明,基于新模型的检测方法可以有效降低噪声对相态跃迁的影响,改善弱信号检测的可靠性。展开更多
This article is a comprehensive overview of the ongoing research of the author on charged colloidal rods out of equilibrium, under external electric fields and at high concentrations around the glass transition. The s...This article is a comprehensive overview of the ongoing research of the author on charged colloidal rods out of equilibrium, under external electric fields and at high concentrations around the glass transition. The suspensions of fd-virus particles are used as a model system for charged colloidal rods, which exhibit several disorder-order (and liquid-crystalline) phase transitions. When a low AC electric field is applied to suspensions in isotropic-nematic coexistence concentration, with frequencies that are sufficiently low to polarize the electric double layer and the layer of condensed ions, various phases/states are induced: a chiral nematic, a dynamical state where nematic domains persistently melt and form, and a uniform homeotropic phase. A point in the field-amplitude versus frequency diagram, where various transitions lines meet, can be identified as a non-equilibrium critical point. Without an electric field, at high concentrations of charged fd-rods, various self-assembled orientation textures are found beyond the isotropic-nematic coexistence regions, and a glass transition is observed on approach and within the glass state that are probed. The presented system exhibits transient behaviors of repulsive glasses and slow dynamics out of equilibrium.展开更多
文摘噪声是影响Duffing振子相态跃迁的重要因素,其结果导致Duffing检测可靠性降低,从而影响其在实际工程中的应用。为此,提出了一种含强非线性阻尼项的广义Van der Pol振子相态跃迁模型,从理论上证明了其用于弱信号检测的可行性。与经典Duffing振子相比,新模型具有更强的状态稳定性和噪声免疫性。仿真实验表明,基于新模型的检测方法可以有效降低噪声对相态跃迁的影响,改善弱信号检测的可靠性。
文摘This article is a comprehensive overview of the ongoing research of the author on charged colloidal rods out of equilibrium, under external electric fields and at high concentrations around the glass transition. The suspensions of fd-virus particles are used as a model system for charged colloidal rods, which exhibit several disorder-order (and liquid-crystalline) phase transitions. When a low AC electric field is applied to suspensions in isotropic-nematic coexistence concentration, with frequencies that are sufficiently low to polarize the electric double layer and the layer of condensed ions, various phases/states are induced: a chiral nematic, a dynamical state where nematic domains persistently melt and form, and a uniform homeotropic phase. A point in the field-amplitude versus frequency diagram, where various transitions lines meet, can be identified as a non-equilibrium critical point. Without an electric field, at high concentrations of charged fd-rods, various self-assembled orientation textures are found beyond the isotropic-nematic coexistence regions, and a glass transition is observed on approach and within the glass state that are probed. The presented system exhibits transient behaviors of repulsive glasses and slow dynamics out of equilibrium.
