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The functional roles of the NaChs were tested by observing the effect of tetrodotoxin, a specific blocker of NaChs, on the intrinsic heart rate of isolated rat working heart.

建立大鼠离体灌流心脏模型,观察钠通道特异性阻断剂河豚毒素对离体灌流心脏自发性节律即固有心率的影响。

Approach to a virtual experiment under a central force;

有心力作用的虚拟实验探讨

Three expressions of conic section and central force problem;

圆锥曲线的三种表示和有心力问题

The orbital stability in the central force field;

有心力场中运动轨道的稳定性

The orbit of motion in central force field is discussed and a few decision methods of the orbit stability are given.

讨论了质点运动轨道的稳定性问题,并给出了轨道稳定性的几个简明而又实用的判据,然后分析了有心力场中质点轨道的稳定性问题。

By the natural and harmonious relationship between differential forms and differential equations and between differential forms and vector analysis, we discuss the properties, which are covariant under the transformation of coordinates in the framework of differential forms, of particle motion in a central force field.

通过微分形式与微分方程和向量分析之间存在的自然而协调的关系，在微分形式框架下讨论了质点在有心力场中运动的特性并得出在坐标变换下其均是协变的

In addition,we discussed the character of these curves and the relations between Multi-knot curve and central field.

扩展了卡西尼卵形线和伯努利双纽线 ,得到所谓的多卵线和多纽线 ,并进一步讨论了这两种曲线的性质及多纽线和有心力场的关

In this paper it is shown that there are two vector constants of the motion for a charged particle in the central field of force.

证明了带电粒子在有心力场中运动时有两个守恒矢量。

In this paper,the symmetries of two central fields in the classical mechanics that result in closed orbits for all bound particles are discussed by using the group theory method.

本文用群论方法讨论了经典力学中导致质点作闭合轨道运动的两类有心力场的对称性，通过演算阐明了平方反比引力场和虎克定律场分别具有ＳＯ（４）和ＳＵ（３）对称性。

Introducing the effctive POtential, the two -- dimensional central force mation in the potential field for the inertial system can be handled by means of the one -- dimensional central force motion for the non -- inertial system, because they are equivalent.

将惯性系有势场中的二维有心运动问题等价于非惯性系有势场中的一维运动问题来处理，从有效势曲线提供的信息。