排序方式: 共有77条查询结果,搜索用时 15 毫秒
1.
2.
《Ceramics International》2016,42(10):11858-11865
Glass and in-situ nanocrystalline glass-ceramics of compositions 45SiO2-25CaO-10Na2O-5P2O5-xFe2O3-(15-x) MnO2 are investigated for their magnetic and in-vitro bioactive properties. The ferrimagnetic character is observed in the high Fe2O3 containing in-situ nanocrystalline glass-ceramics. Saturation magnetization and coercivity increases with Fe2O3. After soaking in the simulated body fluid (SBF), the powdered as well as the bulk glasses and glass-ceramics are investigated using various characterization techniques. The presence of MnO2 increases the leaching of Na+ ions from the glasses and also attracts the Ca2+ cations from the SBF as compared to Fe2O3 containing nano-crystalline glass-ceramics. It also increases the tendency to form hydroxyl apatite (HAp) layer. Microwave Plasma Atomic Emission Spectroscopy (MP-AES), Fourier Transform Infrared (FTIR) spectra, X-ray diffraction and Scanning electron micrographs (SEM) after soaking in the SBF confirm the HAp formation on the surface of all the glasses and glass-ceramics. Urbach energy also indicates the structural modifications on the surfaces of the glass and glass-ceramics after soaking in the SBF. 相似文献
3.
为掌握水泥分解炉运行过程的动态特性,采用机理建模与神经网络相结合的方法构建了水泥分解炉一维特性模型,并结合工业数据对该方法的可行性进行验证。结果表明,模型能够准确地计算炉内温度、气体浓度等参数,具有良好的泛化性能。基于所提出的模型,研究了炉内各状态参数的稳态分布特性。此外,对喷煤量、生料下料量、喷氨量以及高温风机转速等操作变量进行阶跃实验,分析上述操作变量改变时分解炉出口温度及出口NO x 含量的动态响应情况。研究所得相关动态特性规律可以为控制系统的分析、设计和优化提供参考与依据。 相似文献
4.
本文提出了水泥厂内分布式光伏发电的创新及应用,并从政策、方案设计及经济分析等方面进行了论述,为传统的高耗能的水泥行业的节能减排提出新的思路和方向。 相似文献
5.
节能降耗是我国水泥工业今后发展的必由之路。本文在介绍水泥熟料烧成系统热耗组成的基础上,对现有耐火隔热材料进行了对比,突显出新型纳米隔热材料在节能降耗上具有的特点和优势,以期促进该材料在水泥工业的早日推广和应用。 相似文献
6.
7.
针对我国目前危险废弃物的处置方法主要以焚烧和安全填埋为主的现状,采用水泥窑协同处置危废的方法,利用已有回转窑,通过对水泥窑协同处置危废的工艺分析,该方法具体优点体现在:煅烧温度高,高温停留时间长,湍流碱性工况,危险废物无害化彻底;焚烧灰渣直接利用;危险废物中有机、无机成分得到了充分利用;排放气体高效处置;回转窑热容量大,工况稳定,危险废物处理量大。 相似文献
8.
9.
Landraces are used in breeding programs as a source of resistance and compose a small group of genetic materials accepted under organic seed production. The goal of this study was to evaluate the susceptibility of Brazilian landraces grains to the attack of Sitophilus zeamais. Ten different landraces were subjected to the attack of S. zeamais in choice and no-choice experiments. We evaluated the number of emerged insects and the weight reduction of the damaged grains. The Presidente Amarelo landrace received 4.4 and 5.4 times less insects than Colorado and Cateto in the choice experiment. Also, the Ligeirinho and Presidente Amarelo landrace provided the emergence of 4.2 times less adults than Cateto. The landraces presented different results when submitted to choice and no-choice experiments. However, Cateto grains presented the highest susceptibility to attack in both experiments. Presidente Amarelo, on the other hand, presented the highest resistance to the attack of S. zeamais and so might be considered to be used as a source of resistance in breeding programs. 相似文献
10.
焙烧温度对TiO2成型载体性能的影响 总被引:3,自引:1,他引:2
以偏钛酸为原料,采用挤条成型的方法制备TiO2成型载体。考察焙烧温度对TiO2成型载体抗压强度、比表面积、孔容、孔径分布和晶相结构等的影响,采用XRD、BET、TG-DSC和SEM等手段对载体进行表征,并采用浸渍法制备了用于粗对苯二甲酸加氢精制的Pd/TiO2催化剂。结果表明,提高焙烧温度有利于提高成型载体的侧压强度,但会使成型载体的比表面积和孔容降低,孔径分布向大孔方向位移。焙烧温度超过800 ℃,锐钛型TiO2成型载体的晶型结构发生相变,逐步转变成金红石型。600 ℃制备的TiO2成型载体的侧压强度在110 N·cm-1以上,比表面积达60 m2·g-1。并用TiO2成型载体制备了质量分数0.5%Pd/TiO2催化剂,用于对苯二甲酸加氢精制过程,4-CBA转化率达99%以上,为对苯二甲酸加氢精制催化剂研究提供了新的载体。酸 相似文献