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magnetに関するw2allenのブックマーク (4)
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w2allen 2014/01/03
スーパーディスクドライブ搭載のワープロ専用機なんてものがありました。- word
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東芝、ジスプロシウムを使用しない耐熱型強力磁石を開発 | スラド
東芝は、レアアースの中でも特に希少なジスプロシウムを一切使用しないモーター用高鉄濃度サマリウム・コバルト磁石を開発した(プレスリリース)。 ネオジム磁石と比べて磁力が劣るサマリウム・コバルト磁石の磁力を増大させるために鉄の配合量を増やし、独自の熱処理技術により磁力の阻害要因を低減させたとのこと。摂氏100度以上のモーターの実使用温度域で、ジスプロシウムを使った耐熱型ネオジム磁石と同等以上の性能を実現した。同社は2012年度末までの市場投入を目指すとのことだ。
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なぜ木星や土星の磁気は地球に比べてはるかに強力なのか。 - 地球とは違った仕組みで磁気が発生しているのでしょうか。もし地球と... - Yahoo!知恵袋
なぜ木星や土星の磁気は地球に比べてはるかに強力なのか。 地球とは違った仕組みで磁気が発生しているのでしょうか。 もし地球と同じダイナモ効果で磁気が発生しているとしたら、それは木星や土星がコアを持つ証拠になりませんか。
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