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采用玻璃纤维、纳米粘土制备复合材料桩钉,测试其力学性能,并通过细胞毒性试验、溶血性试验研究桩钉的生物性能,为临床应用提供技术保证. 相似文献
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1. IntroductionX-r8y spectroscopy can provide much informationabout the plasma parameters, and it is often usedas a diagnostic tool for hot plasmas [1]. Resonancelines, such as Ly a and He cr, are often used for theanalysis of soft xrny spectra from highly--chargedplasmas [2,3,4,5,6], and their adjacent dielectronicsatellite lines are used to investigate the line opac-ity and intensity distribution of these resonance Iines[7,8,9,l01. In fact, dense plasmas produced by a ns-pulsed laser are op… 相似文献
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A novel double metal cyanide complex (DMC) based on Zn[Ni(CN)4] was prepared using K2[Ni(CN)4] and ZnCl2, and employed as catalyst for the copolymerization of carbon dioxide and propylene oxide (PO). The resulting copolymers were characterized by IR, ^1HNMR. The results show that this catalyst exhibits catalytic efficiency at approximate 500 g copolymer per gram of Zn[Ni(CN)4] under proper conditions. The mole fraction of CO2 for copolymer can reach about 0.3. Propylene carbonate is also produced as by-product, but its content is as low as 4%-6% of overall products under suitable conditions. 相似文献
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建立了Al0.3Ga0 22In0.48P/GaAs异质结双极型晶极管(HBT)中电流输运过程的模型,利用实验得到的材料特性参数进行了HBT电流增益随温度变化的模拟。随着温度上升,小电流时电流增益下降较多,而大电流时电流增益基本保持不变.模拟表明,小电流下电流增益的下降主要是由eb结空间电荷区的复合电流随温度增加而造成的;而大电流下电流增益直至723K下降仍小于10%.最高工作温度可达848K.由于采用的计算方法充分考虑了空间电荷区复合电流的影响,模拟结果较为符合实际情况,可为研制高性能HBT器件所需材料提供参考依据。 相似文献
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湘桂铁路三街漓江双线特大桥桥区地质条件复杂、岩溶发育,桩基础施工过程中出现各类问题。为确保工程顺利进行,同时降低了施工风险,依据问题提出了具体的施工对策。根据水下灌注桩施工原理,利用多次封"底"技术措施,解决因溶洞造成混凝土面下降导致断桩问题;利用连通器的原理,解决串孔施工问题。该桥施工中出现的这类问题的7根桩施工完成后经第三方超声波检测均为Ⅰ类桩。 相似文献