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Porous β-tricalcium phosphate bioceramic (PTCP) has important roles in surgical implants because of good biocompatibility. But the low compressive strength of the ceramic limits its application. The preparation of PTCP was improved with the adjustment of the constituents and the sintering-process. A new type of PTCP material with high compressive strength was made. The compositions, microstructure and properties of PTCP were analyzed by TG-DSC, XRD, TEM, SEM and so on. The result indicates that stearic acid burns sufficiently and gives out carbon dioxide and water vapor when slowly heated between 200 ℃ and 400 ℃ so that the porous structure like coral in β-TCP bioceramic is formed. Through crystallization at 470 ℃ and 570 ℃, more CaO-P2O5 glass-cement is converted into crystallite-glass, which is beneficial for improving the compressive strength of β-TCP bioceramic.PTCP can form a support action in bone imperfect section with good solubility. 相似文献
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设计了一种以微处理器Atmegal63为核心,对人体多道生理参数进行实时采集和高速数据传输的电路,以此构成人体生理参数检测仪,为医生诊断病情提供依据。 相似文献
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地方应用型本科院校,作为高等教育的一个重要组成部分,为加快地方人才培养步伐、促进地方经济建设和发展,起到了不可替代的作用.在学生生源逐步减少和产业结构优化调整的新形势下,地方本科院校如何扬长避短,走出一条具有自身办学特色的新路子,是摆在人们面前的一个紧迫问题.本文根据当前实际,分析了办学中遇到的实际问题及原因,提出了教学改革中的新思路和新方法. 相似文献
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一、前言尿素合成塔过去常用00Cr17Ni14Mo2(UG316L)钢作衬里材料,用316L型的焊条焊接,对该系统所产生的腐蚀问题,已做过许多工作。目前我国取得国际认可的制造尿素合成塔的厂家都采用UG316L不锈钢板作塔的衬里材料,使用BM310Mo-L焊条(简称25-22-2)焊接。这种焊缝有可能成为腐蚀的薄弱环节。因此,对UG316L/25-22-2焊缝系统腐蚀性能进行研究,找出其腐蚀规律,在理论上和生产上都是很有意义的。 相似文献