Calcium phosphates ( cp ) have been studied extensively for cell cultures and have been found to possess good osteoconductive properties . cp can be dissolved in vivo and be absorbed or displaced by tissue . the degradation rate of cp varies in different crystalline phases , which enables to adjust the degradation rate of biomaterials 钙磷酸盐如磷酸三钙具有骨诱导性，在体内有较大的溶解度，易发生水化作用，并通过体液的侵蚀和细胞的吞噬作用被机体部分或完全吸收而被取代，不同晶型的钙磷酸盐在体内的降解速率不同，可调整材料的降解速率。
In the field of biomedical engineering , after implanting , how degradable bioceramics degrade ; how fresh bone is made and how fresh bone participates in organism metastasis , etc . are in question . simulating the process of bioceramic degradation in vivo by means of computer techniques can not only shorten the cycle from material " s research to its clinic popularization but also reduce the cost of new material " s development , which will bring advantage for clinic repair and substitution of bone 在生物医学工程领域，可降解生物陶瓷是一种性能优良的骨替代和修复材料，尤其是多孔磷酸三钙( tcp )陶瓷，其生物降解性能已经被临床所证明，但可降解生物陶瓷材料在体内究竟如何逐步降解，以及新组织是如何生成并参与生物体内的新陈代谢等问题仍处在探索研究阶段。
Test study on passivation methods in chemical cleaning of boilers , including to use sodium nitrite , hydrogen peroxide , polyphosphate , hydrazine , acetone oxime , trisodium phosphate , and sodium carbonate , has been carried out , and combined with typical examples of application , recommendations for selecting these passivation methods and for using suitable passivation technology being put forwad 摘要对锅炉化学清洗中亚硝酸钠钝化法、过氧化氢钝化法、多聚磷酸盐钝化法、联氨钝化法、丙酮肟钝化法、磷酸三钠钝化法和碳酸钠钝化法进行了试验研究，并结合典型的应用实例，提出了选择这些钝化方法的建议和适合采用的钝化工艺。
