Effects of an electromagnetic field on intracellular calcium oscillations in a cell with external noise

Intracellular calcium ion concentration oscillation in a cell subjected to external noise and irradiated by an electromagnetic field is considered. The effects of the intensity E₀, the polar angle θ and the frequency omega of the external electric field on steady-state probability distribution and the mean Ca²⁺ concentration, respectively, are investigated by a numerical calculation method. The results indicate that (i) variation of ω cannot affect the intracellular calcium oscillation; (ii) the steady-state probability distribution presents a meaningful modification due to the variations of E₀ and θ, while variation of θ does not affect the steady-state probability distribution under the condition of a small E₀, and E₀ cannot affect the steady-state probability distribution either when θ = π/2; (iii) the mean Ca²⁺ concentration increases as E₀ increases when θ < π/2 and, as θ increases, it first increases and then decreases. However, it does not vary with E₀ increasing when θ = π/2, but it increases with θ increasing when E₀ is small.     

多重分派问题

系统分析了多重分派问题的线性规划模型的性质和特点，得到一个直接求解多重分派问题的算法，利用该算法来求解古典题，无需要求完全二部图，特别是求解过程不会受到已化解的影响。     

非平衡分派问题的次数序列算法

根据 [2 ]中的结论 ,得到一个利用顶点的次数向量求解非平衡分派问题的算法 ,该算法不受退化解的影响 ,且其复杂性为 O(n· m3 ) .     

强化数学实验教学，提高应用数学能力

“提高数学修养，培养应用能力”是工科数学教学最根本，也是最终的目标。如何通过教学活动实现这一目标，是当今高等数学教学改革的中心。本以数学实验为切入口，提出通过在高等数学教学中强化数学实验课程的教学，来逐步实现这一目标。