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1·By introducing the boundary conditions of the circular plate, the flexure displacement, radial rotation Angle, radial bending moment and radial shear force on each nodal line of the plate were given.

引入圆板的边界条件，给出了该板每条节线上的挠度、径向转角、径向弯矩和径向剪力。

2·The influence of switching off branch on system nodal voltages and line loads is analyzed and the concept of security margin and its calculation formula are given.

分析了支路断开对系统节点电压及线路负荷的影响，给出安全裕度概念和计算公式。

3·Constructs 28 nodal casting production line control systems of integrated PLC and intellectual instrument on the basis of RS485 network technology.

基于RS485网络技术构筑28个节点的集成plc和智能仪器的铸造生产线控制系统。

4·Considering the sensitivity of virtual nodal voltage to line reactance and variation of reactive power of power grid comprehensively, the voltage instability index is put forward.

综合考虑节点电压关于线路电抗和系统无功功率变化的灵敏度，提出了电压失稳指标。

5·By means of the proposed algorithm the sensitivity of nodal voltage to any network parameter can be obtained, such as line reactance, variation of reactive power of power grid and so on.

通过该算法可得到节点电压对任何网络参数的灵敏度，比如线路电抗、电网无功功率的变化等。

6·The aim of the paper is to receive nodal impedance matrix by adding - branch line algorithm and admittance matrix algorithm, to analyze the effect of them, and to provide the models.

使用了支路追加法和导纳矩阵求逆法来形成节点阻抗矩阵，给出了两种算法的数学模型，分析了算法各自的特点和优势。