In this paper, the math models of the expressway network structure based on the road network structure are established from the theory, which are the tree structure chart and the net structure chart .
本文从理论上建立了基于路网结构的高速公路的路网数学模型—树状结构图和网状结构图，并结合实际提出了适用于这两种网络模型的高效灵活的清分算法，给出了树状结构图和网状结构图清分算法的实例分析，并给出了两种清分算法的计算机实现。
Precipitation synthesis and characterization of Mg_5(CO_3)_4(OH)_2·4H_2O microrods with a surface of“house of cards”structureBasic magnesium carbonate (Mg_5(CO_3)_4(OH)_2·4H_2O) microrods with a surface of“house of cards”structure have been synthesized in an aqueous solution system without using any surfactants or templates during the precipitation process.
沉淀法制备棒状碱式碳酸镁在不用任何模版和表面活性剂的情况下,利用Mg(NO_3)_2·6H_2O和K_2CO_3作为原料合成了表面为树叶状的棒状结构。