هلیوم: تفاوت میان نسخهها
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محتوای حذفشده محتوای افزودهشده
خط ۳۰۸:
== پیوند به بیرون ==
'''عمومی'''
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* [https://web.archive.org/web/20080725060842/http://www.blm.gov/wo/st/en/info/newsroom/2007/january/NR0701_2.html U.S. Government's Bureau of Land Management: Sources, Refinement, and Shortage.] With some history of helium.
* [http://minerals.usgs.gov/minerals/pubs/commodity/helium/ U.S. Geological Survey publications on helium] beginning 1996: [http://minerals.usgs.gov/minerals/pubs/commodity/helium/mcs-2012-heliu.pdf Helium]
* [https://web.archive.org/web/20121110030719/http://www.aga.com/international/web/lg/aga/like35agacom.nsf/0/BEF74B49AFC3099DC1257A2200473157 Where is all the helium?] Aga website
* [http://education.jlab.org/itselemental/ele002.html It's Elemental – Helium]
* [http://www.rsc.org/chemistryworld/podcast/element.asp Chemistry in its element podcast] (MP3) from the [[
* [https://web.archive.org/web/20170709192820/https://www.cdc.gov/niosh/ipcsneng/neng0603.html International Chemical Safety Cards – Helium]; includes health and safety information regarding accidental exposures to helium
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'''جزئیات بیشتر'''
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* [http://www.periodicvideos.com/videos/002.htm Helium] at ''[[The Periodic Table of Videos]]'' (University of Nottingham)
* [http://boojum.hut.fi/research/theory/helium.html Helium] at the [[
* [http://www.physics.lancs.ac.uk/research/condmatt/ult/index.htm Lancaster University, Ultra Low Temperature Physics] – includes a summary of some low temperature techniques
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'''گوناگون'''
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* [https://web.archive.org/web/20041210113812/http://www.phys.unsw.edu.au/PHYSICS_!/SPEECH_HELIUM/speech.html Physics in Speech] with audio samples that demonstrate the unchanged voice pitch
* [https://web.archive.org/web/20050904191641/http://du.edu/~jcalvert/phys/helium.htm Article about helium and other noble gases]
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'''کمبود هلیوم'''
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* [https://purl.fdlp.gov/GPO/gpo41438 America’s Helium Supply: Options for Producing More Helium from Federal Land: Oversight Hearing before the Subcommittee on Energy and Mineral Resources of the Committee on Natural Resources, U.S. House Of Representatives, One Hundred Thirteenth Congress, First Session, Thursday, July 11, 2013]
* [https://purl.fdlp.gov/GPO/gpo35149 Helium Program: Urgent Issues Facing BLM's Storage and Sale of Helium Reserves: Testimony before the Committee on Natural Resources, House of Representatives] [[
* {{cite web
|last = Kramer
سطر ۳۳۸ ⟵ ۳۴۲:
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* {{Cite web|last1=Richardson|first1=Robert C.|last2=Chan|first2=Moses|url=http://eolus.phys.northwestern.edu/CM_Theory_Group/Photos/Pages/QFS2009_files/Helium_Shortages_Chan-Richardson.pdf|title=Helium, when will it run out?|year=2009|url-status=dead|archiveurl=https://web.archive.org/web/20150614095643/http://eolus.phys.northwestern.edu/CM_Theory_Group/Photos/Pages/QFS2009_files/Helium_Shortages_Chan-Richardson.pdf|archivedate=2015-06-14|df=}}
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