共搜索到1221条信息,每页显示10条信息,共123页。用时:0小时0分0秒359毫秒
Effect of Nd3+ substitution on structural and magnetic properties of Mg-Cd ferrites synthesized by microwave sintering techniqueP.N.Vasambekar44. Department of Electronics, Shivaji University摘 要... structure of ferrite. The influence of Nd3+substitution on various structural parameters of Mg-Cd ferrites was reported. IR study indicates the spectra contain two intense absorption bands around 600......
Effect of cobalt substitution on structure and magnetic properties of Nd0.4Zr0.6Fe10-xCoxSi2(x =0-3) alloys and their ribbonsM.Gjoka1,2,C.Sarafidis3,G.Giannopoulos1,D.Niarchos1,G.Hadjipanayis2,J... increases linearly with Co substitution from 561 K for x = 0 to 712 K for x = 3. The saturation magnetization decreases slightly from 130.5(x =1)to 129.1 A·m2/kg(x=3), while the anisotropy field is following......
Tuning effect of silicon substitution on magnetic and high frequency electromagnetic properties of R2Fe17 and their compositesWenyun Yang1,2,Qiwei Hu1,2,Guanyi Qiao1,2,Liang Zha1,2,Shunquan... Materials and Devices摘 要:In this work, we report the tuning effect of the Si substitution on the magnetic and high frequency electromagnetic properties......
Effect of cobalt substitution on structure and magnetic properties of Nd0.4Zr0.6Fe10-xCoxSi2(x =0-3) alloys and their ribbonsM.Gjoka1,2,C.Sarafidis3,G.Giannopoulos1,D.Niarchos1,G.Hadjipanayis2,J... increases linearly with Co substitution from 561 K for x = 0 to 712 K for x = 3. The saturation magnetization decreases slightly from 130.5(x =1)to 129.1 A·m2/kg(x=3), while the anisotropy field is following......
Tuning effect of silicon substitution on magnetic and high frequency electromagnetic properties of R2Fe17 and their compositesWenyun Yang1,2,Qiwei Hu1,2,Guanyi Qiao1,2,Liang Zha1,2,Shunquan... Materials and Devices摘 要:In this work, we report the tuning effect of the Si substitution on the magnetic and high frequency electromagnetic properties......
Effect of praseodymium substitution for lanthanum on structure and properties of La0.65-xPrxNd0.12Mg0.23Ni3.4Al0.1(x=0.00-0.20) hydrogen storage alloys LI Baoquan1,KONG Fanqing1,XIONG Wei1,LI... Pr substitution. Key words:hydrogen storage alloy; La-Mg-Ni system; metal hydrides; MH/Ni batteries; electrochemical properties; rare earths; [全文内容正在添加中] ......
Effect of substitution of Si by Al on the microstructure and mechanical properties of bainitic transformation-induced plasticity steelsKangying Zhu1,Coralie Mager1,Mingxin Huang21. R&D Arcelor Mittal Maizières2. Department of Mechanical Engineering, The University of Hong Kong摘 要:The effect of partial or full substitution of Si by Al......
琼脂糖醋酸酯的制备方法与表征 尤玲玲1,赵瑞芳1,汤顺清2,黄晙聪2 (1.暨南大学化学系,广州,510632;2.暨南大学生物医学工程研究所,广州,510632) 摘要:以浓硫酸为催化剂,琼脂糖与醋酸酐反应制备出琼脂糖醋酸酯.研究了反应温度等参数对取代度的影响,结果表明,50℃时取代度最大.接触角测试结果表明,琼脂糖醋酸酯较琼脂糖接触角增大,疏水性明显增强.傅里叶变换红外光谱,核磁共振碳谱证实形成了琼脂糖醋酸酯.热重分析测试表明,琼脂糖醋酸酯具有不同于琼脂糖的热特性.琼脂糖醋酸酯可作为疏水性新型可纺丝材料,可望应用于组织工程支架. 关键词:琼脂糖; 琼脂糖醋酸酯; 取代度; 疏水性; agarose; agarose acetate; substitution degree; hydrophobic; [全文内容正在添加中] ......
淀粉与2-氯乙醇醚化反应的研究 杨连生1,张本山1,徐立宏2 (1.华南理工大学轻工与食品学院,广州,510640;2.华南理工大学化学科学学院,广州,510640) 摘要:对在水溶液中不同反应条件下淀粉与2-氯乙醇醚化的反应进行了研究.考察的因素包括碱处理时间与温度,氢氯化钠及2-氯乙醇的用量以及醚化时间与温度.结果表明,碱处理时间超过40min,摩尔取代度没有明显的变化.摩尔取代度随氢氧化纳用量的增加而提高,但达到最大值后则会降低.随醚化时间的延长,摩尔取代度增大,但10h以后则变化不大.醚化温度在53℃时可以得到较高的摩尔取代度. 关键词:醚化; 淀粉; 摩尔取代度; 2-氯乙醇......
......