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发表于 2008-10-22 14:14 | 显示全部楼层 |阅读模式
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Nuclear weapons:4 s% y. c% X- E. ]
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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' y5 E4 @" s* b/ {# U( W7 U9 YWeapons of Mass Destruction. (2003). In Harvey Kushner (Ed.), Encyclopedia of Terrorism, Vol. 1. (404-406). Thousand Oaks: Sage Reference. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
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; e7 \' y" s+ C  _+ c- k7 l4 H. JNuclear Weapons. (2006). Encyclopedia of Modern Europe: Europe Since 1914: Encyclopedia of the Age of War and Reconstruction, Vol. 4. (1891-1898). Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale: 9 G9 n1 R8 z( x5 P, f0 `+ D
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>0 J$ e$ |' A* K" Q% R3 \3 O
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  N2 l0 h0 z  ], @, M( ?- ~8 YClark, Roger. (2005). Nuclear Weapons. In Dinah Shelton (Ed.), Encyclopedia of Genocide and Crimes Against Humanity, Vol. 2. (754-761). Detroit: Macmillan Reference USA. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
: j) F. }& Z7 z6 S<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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" [& {% v- Q2 ^' j/ fLerner, K. Lee, Gilman, Larry, & Haycock, Dean Allen. (2004). Nuclear Weapons. In K. Lee Lerner & Brenda Lerner (Eds.), Gale Encyclopedia of Science, Vol. 4. (3rd ed., 2816-2821). Detroit: Gale. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale: 2 P+ y6 W% _6 y/ W0 R' B* B9 j
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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! a( L% ]! U( Ocritical mass
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( n3 i: \* F1 ^- g1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.! p5 }& U& Y3 m0 A. _! K8 m
2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe0 [6 w  O- \& n9 K; e( j1 Q
<http://www.thefreedictionary.com/critical+mass>6 _, o; n$ U* }: h/ D) M% J6 B# d
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