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2007 Vol.19 Issue.2,
Published 2007-04-18
Article
Article
Article
3
2007 Vol. 19 (2): 3-7 [
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2007 Vol. 19 (2): 8-10 [
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2007 Vol. 19 (2): 12-14 [
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2007 Vol. 19 (2): 15-16 [
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2007 Vol. 19 (2): 17-23 [
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2007 Vol. 19 (2): 24-30 [
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2007 Vol. 19 (2): 31-32 [
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2007 Vol. 19 (2): 33-35 [
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20世纪90年代以来，随着美国政府一些机密文件的解密以及一些科学家的纪念性撰文陆续披露了美国科学家在美国国家安全、现代情报收集方面所起的重要作用。本文以讲故事的方式介绍这段历史。
2007 Vol. 19 (2): 39-44 [
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2007 Vol. 19 (2): 45-46 [
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2007 Vol. 19 (2): 47-48 [
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2007 Vol. 19 (2): 49-49 [
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2007 Vol. 19 (2): 50-51 [
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2007 Vol. 19 (2): 52-52 [
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2007 Vol. 19 (2): 53-53 [
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2007 Vol. 19 (2): 54-54 [
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2007 Vol. 19 (2): 55-59 [
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2007 Vol. 19 (2): 60-61 [
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2007 Vol. 19 (2): 62-63 [
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2007 Vol. 19 (2): 64-66 [
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2007 Vol. 19 (2): 67-68 [
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2007 Vol. 19 (2): 69-70 [
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物理知识
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2007 Vol. 19 (2): 11-11 [
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物理前沿
36
爱因斯坦广义相对论成功地预言了行星进动、引力红移、光线偏折、回波延迟等物理事实，而“存在引力波”是爱因斯坦广义相对论的另一重大预言。根据广义相对论，我们从爱因斯坦广义相对论引力场方程的弱场近似可以得到线性近似的引力波解；引力波是横波，能以光速穿过真空；引力波非常容易产生，但是非常的弱：如果让一根长为20米，直径为1.6米，重500吨的圆棒以能够使自身断裂的极限速度（每秒28转）围绕自身中心点高速转动，它发射的引力波功率也不过只有2.2×10
-19
瓦，因此，对引力波的探测极其困难。
2007 Vol. 19 (2): 36-38 [
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