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复合氧化物由于其结构的稳定性和非化学计量氧的可变性,日益成为材料净化科学领域的研究热点.简要介绍了各类复合氧化物的结构和化学性质,综述了近年来复合氧化物在柴油车排放污染物净化领域的研究进展及存在的问题和发展方向. 相似文献
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从美国比赛路斯公司引进的395B1型32m^3电动挖掘机是我矿采挖生产的关键设备。2001年它的行走平衡轮架轴发生损坏,直接影响到煤矿的正常生产,必须尽快改进结构并进行国产化的研制。 相似文献
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Catalytic performances of a series Ce/Zr oxides(CexZr1-xO2 )for soot combustion were investigated. The catalytic activities for soot combustion were affected by both the Ce/Zr ratio and the oxygen storageinvestigated. Thecapability of Ce/Zr oxides. O2-TPD and TG-DTA results indicate that CexZr1-xO2 can release its lattice oxygen continuously and promote soot combustion even no oxygen occurs in the reaction atmosphere. Among these Ce/Zr oxides, Ce0.5Zr0.5O2 has the best catalytic activity, and the ignition temperature of soot combustion was about 410℃, which is close to the practical exhaust temperature of the diesel engine. 相似文献
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由于电铲的作业条件恶劣,冲击负载频繁,其斗杆、齿条等零部件容易受到损坏。文章介绍了斗杆、齿条焊修的程序、步骤和注意事项。 相似文献
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本文介绍了黑岱沟露天煤矿连续工艺系统布置及生产能力的确定方法,对露天矿同仁了解黑岱沟露天煤矿连续开采系统有重要参考价值。 相似文献
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Nanostructure K2NiF4 type oxides La2-xKxCuO4 complex oxides were prepared using the Sol-Gel method, characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared (FT-IR), and Scanning Electron Microscopy (SEM). The catalytic activity for soot combustion was evaluated by the Temperature-Programmed Reaction (TPO) technique. The results demonstrated that the substitution quality of K^+ for La^3+ at the A-site would increase the catalytic activities of La2-xKxCuO4 for soot combustion greatly; the substitution quality affected the structure and catalytic activity obviously. The La1.8K0.2CuO4 complex oxides with tetrahedral structures had the best catalytic activity for soot combustion, and the ignition temperature of soot combustion was lowered from 490 to 320 ℃. 相似文献
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本文介绍了从引进设备中进行消化、吸收、移植而试制的清钢联散棉喂给机和ML-1型散棉流量计的用途、技术参数、结构特点、工作原理和试验情况。有回棉清钢联采用由散棉流量计控制的散棉喂给机,因散棉流量计能无级调速,及时调整并稳定管道内棉流量;散棉喂给机的回棉仓分隔二层,大小棉块由气流能实现分离,小棉块不再重复打击而减少了棉结,所以能有均匀输出的作用,有利于控制生条重量不匀和重量偏差。 相似文献
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目的探讨高渗氯化钠羟乙基淀粉注射液对食管癌术后患者恢复的影响。方法选择食管癌手术患者246例,随机分为实验组、对照组。实验组患者术后3d内,均行高渗氯化钠羟乙基淀粉注射液输注,8~9mL/kg。对照组以同等量的葡萄糖氯化钠注射液输注,余静脉补液与实验组相同。结果实验组患者病人尿量在术后24、48、72h较对照组明显增加(P<0.05);实验组和对照组吻合口瘘分别发生2例,8例,二者有明显差异(P<0.05)。结论术后小剂量输注高渗氯化钠羟乙基淀粉注射液能明显降低食管癌吻合口瘘的发生率。 相似文献