英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:

neodymium    
n. 钕



neodymium
n 1: a yellow trivalent metallic element of the rare earth
group; occurs in monazite and bastnasite in association
with cerium and lanthanum and praseodymium [synonym:
{neodymium}, {Nd}, {atomic number 60}]

Neodymium \Ne`o*dym"i*um\, n. [NL. Dee {Neo-}, and {Didymium}.]
(Chem.)
The chemical element of atomic number 60, one of the rare
earth elements. Symbol Nd. Atomic weight 144.27.

Note: It is a rare metallic element occurring in combination
with cerium, lanthanum, and other rare metals, and
forming amethyst-colored salts. It was originally
thought to be part of a supposed new element didymium,
obtained from cerite in 1843. Later this was resolved
into two elements, neodymium and praesodymium by von
Welsbach in 1885. It is chiefly trivalent. It is a
faintly yellow metal.
[1913 Webster PJC]

neodymium
Symbol: Nd
Atomic number: 60
Atomic weight: 144.24
Soft bright silvery metallic element, belongs to the lanthanoids. Seven
natural
isotopes, Nd-144 being the only radioactive one with a half-life of
10^10
to 10^15 years. Six artificial radioisotopes have been produced. The
metal is used in glass works to color glass a shade of violet-purple and
make it dichroic. One of the more reactive rare-earth metals, quickly
reacts
with air. Used in some rare-earth alloys. Neodymium is used to color
the glass used in welders' glasses. Neodymium is also used in very
powerful, permanent magnets (Nd2Fe14B). Discovered by Carl F. Auer von
Welsbach in Austria in 1885 by separating didymium into its elemental
components {praseodymium} and neodymium. The name comes from the Greek
words
"neos didymos" which means "new twin". Neodymium should be considered
highly toxic, however evidence would seem to show that it acts as little
more than a skin and eye irritant. The dust however, presents a fire and
explosion hazard.


请选择你想看的字典辞典:
单词字典翻译
Neodymium查看 Neodymium 在百度字典中的解释百度英翻中〔查看〕
Neodymium查看 Neodymium 在Google字典中的解释Google英翻中〔查看〕
Neodymium查看 Neodymium 在Yahoo字典中的解释Yahoo英翻中〔查看〕





安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Download the YouTube mobile app
    Download the YouTube app for a richer viewing experience on your smartphone
  • مساعدة YouTube
    مركز مساعدة YouTube الرسمي حيث يمكنك العثور على نصائح وبرامج تعليمية حول استخدام المنتج وأجوبة أخرى للأسئلة الشائعة
  • YouTube Hjälp - Google Help
    Officiellt hjälpcenter för YouTube Här hittar du tips om produkten och vägledning för hur du använder den Här finns även svar på andra vanliga frågor
  • YouTube說明
    深入瞭解 YouTube YouTube 說明影片 瀏覽我們的影片庫,查看各項實用訣竅、功能簡介和逐步操作教學課程。
  • YouTube帮助 - Google Help
    您可以在 YouTube 官方帮助中心找到各种提示和辅导手册,从中了解如何使用本产品以及其他常见问题的答案。
  • YouTube ヘルプ - Google Help
    YouTube の詳細 YouTube ヘルプ動画 役立つヒントや機能の概要、操作手順を解説したチュートリアル動画を視聴できます。 YouTube報告されている問題 報告されている技術的な問題や予定されているメンテナンスに関する情報をご確認ください。
  • YouTube Help - Google Help
    Het officiële Helpcentrum van YouTube waar u tips en handleidingen voor het gebruik van het product en andere antwoorden op veelgestelde vragen kunt vinden
  • Use your Google Account for YouTube
    After signing up for YouTube, signing in to your Google account on another Google service will automatically sign you in to YouTube Deleting your Google Account will delete your YouTube data, including all videos, comments, and subscriptions
  • YouTube Ajuda - Google Help
    Saiba mais sobre o YouTube Vídeos de ajuda do YouTube Navegue na nossa biblioteca de vídeos para obter sugestões úteis, descrições gerais de funcionalidades e tutoriais passo-a-passo YouTube Problemas conhecidos Obtenha informações acerca de problemas técnicos comunicados ou de serviços de manutenção programados
  • YouTube - Pomoc
    Oficjalne Centrum pomocy produktu YouTube, w którym można znaleźć porady i samouczki na temat korzystania z produktu, jak również odpowiedzi na najczęściej zadawane pytania





中文字典-英文字典  2005-2009