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| 1 | Anisotropic NdFeB Magnet Fabricated by Single Stroke Hot Deformation显示文摘The general hot deformation process consists of two steps, hot pressing and die-upsetting in order to obtain the anisotropic NdFeB magnet. This is the first report that the high anisotropy NdFeB magnets can be fabricated by single stroke hot deforming the isotropic magnet. The magnetic properties of those materials are: coercivity _iH_c -11 kOe, remanence B_r-12 kG, and the maximum energy product (BH)_max-28 MG.Oe. | Y.Li (Chungnam National University, Taejon, Korea) Y.B.Kim (Korea Research Institute of Standards and Science, Taejon, Korea) M.J.Kim, M.S.Song, J.H.Yang, T.K.Kim and C.O.Kim (Chungnam National University, Taejon, Korea) | 2000 | Journal of Materials Science & Technology2000，16，2： | 7 |
| 2 | Evaluation of spermatogenesis and fertility in F1 male rats after in utero and neonatal exposure to extremely low frequency electromagnetic fields显示文摘Aim: To determine whether in utero and neonatal exposure to a 60Hz extremely low frequency electromagnetic field (EMF) results in spermatotoxicity and reproductive dysfunction in the F1 offspring of rats. Methods: Age-matched,pregnant Sprague-Dawley rats were exposed continuously (21h/day) to a 60 Hz EMF at field strengths of 0 (sham control), 5, 83.3 or 500 μT from day 6 of gestation through to day 21 of lactation. The experimentally generated magnetic field was monitored continuously (uninterrupted monitoring over the period of the study) throughout the study. Results: No exposure-related changes were found in exposed or sham-exposed animals with respect to the anogenital distance, preputial separation, testis weight, testicular histology, sperm count, daily sperm production,sperm motility, sperm morphology and reproductive capacity of F1 offspring. Conclusion: Exposure of Sprague-Dawley rats to a 60Hz EMF at field strengths of up to 500μT from day 6 of gestation to day 21 of lactation did not produce any detectable alterations in offspring spermatogenesis and fertility. | M.K.Chung S.J.Lee Y.B.Kim S.C.Park D.H.Shin S.H.Kim J.C.Kim | 2005 | Asian Journal of Andrology2005，7，2： | 5 |
| 3 | High Coercive NdFeB Thin Film Obtained by Diffusion Annealing显示文摘The magnetic properties and microstructure of diffusion annealed [Ta/Nd/NdFeB/Nd/Ta] thin films have been investigated. The films were deposited on Si substrate with various thickness ratio of Nd/NdFeB layer (R=0-3.3), then diffused and crystallized by annealing at 650℃ for 10 min. The film without Nd layer showed soft magnetic behavior and high content of α-Fe phase. The films with R≥1 showed good hard magnetic properties with the high coercivity of about 20 kOe. | MJ.Kim and Y.B.Kim (Korea Research Institute of Standards and Science, Taejon 305-600, Korea) C.B.Song (Kongju National University, Kongju 314-701, Chungnam, Korea) Y.Li, D.S.Suhr, C.O.Kim and T.K.Kim (Chungnam National University, Taejon 305-340, Korea) | 2000 | Journal of Materials Science & Technology2000，16，2： | 3 |
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