一套新型的CAD软件及其应用

介绍了一套新型的CAD软件的基本功能和使用方法;以一个自由度的模型为例子,详尽地说明了使用该套CAD软件进行系统零件的结构设计、系统的有限元分析、系统的运动分析以及运动控制和仿真的过程.     

Drug-supported microparticles of calcium carbonate nanocrystals and its covering with hydroxyapatite

Drug-supported spherical microparticles with below 3 microm in diameter of calcium carbonate (CC) nanocrystals were precipitated by a complex decomposition method from Na2CO3 and CaCl2 solutions with hydrocortisone phosphate (HyC). The HyC was completely incorporated into the microparticles and was adsorbed on the surface of nanocrystals. The crystal phases of vaterite and calcite were controlled by the addition of magnesium ions. Spherical microparticles of calcite cores and petal-shaped hydroxyapatite (HAp) outer layers were fabricated by soaking calcite into the SBF, or a supersaturated solution of phosphate ions to enhance the crystal growth of HAp.