1、本科毕业设计（论文）外文翻译 -1 中文 3050 字， 2200 单词， 11500 英文字符 文献出处： Liu J R, Itoh M, Machida K. Electromagnetic wave absorption properties of -Fe/Fe 3B/Y2O3 nanocomposites in gigahertz rangeJ. Applied Physics Letters, 2003, 83(19):4017-4019. 原文 1 Electromagnetic wave absorption properties of a-Fe/Fe3B/Y2O3nanoco
2、mposites in gigahertz range Jiu Rong Liu, Masahiro Itoh, and Ken-ichi Machidaa) a Collaborative Research Center for Advanced Science and Technology Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan (Received 24 February 2003; accepted 8 September 2003) Abstract: Nanocomposites a-Fe/Fe3B/
3、Y2O3 were prepared by a melt-spun technique, and the electromagneticwave absorption properties were measured in the 0.0520.05 GHz range. Compared witha-Fe/Y2O3 composites, the resonance frequency (fr) of a-Fe/Fe3B/Y2O3 shifted to a higher frequency range due to the large anisotropy eld (HA) of tetra
4、gonal Fe3B (0.4 MA/m). The relative permittivity ( r r rj ) was constantly low over the 0.510 GHz region, which indicates that the composite powders have a high resistivity ( 100 m ). The effective electromagnetic wave absorption (reection loss 99.9 % in purity) by means of induction melting in Ar.
5、Amorphous Y5Fe77.5B17.5 alloy ribbons with 1.5 mm in width and about 30 mm in thickness were 本科毕业设计（论文）外文翻译 -3 prepared by the single-roller melt-spun apparatus at a roll surface velocity of 20 m/s using the earlier ingots as the starting materials. After ball milling, the powders with particle size
6、s of 2-4 m were heated to 953 K in He with a heating rate of 40 K/min for 10 min. Subsequent heating at 573 K for 2 h in O2 stream gave the resultant powders which were characterized by x-ray diffraction (XRD). The microstructures were observed on a high-resolution scanning electron microscope (HITACHI S-5000). 3. Results and discussion 3.1. Structure characteristics Epoxy resin composites were prepared by homogeneously mixing the composite powders with 20 wt%
