q**w
发帖数: 782 | 1 http://www.technologyreview.com/view/509106/best-of-2012-chines
Best of 2012: Chinese Physicists Smash Distance Record For Teleportation
The ability to teleport photons through 100 kilometres of free space opens
the way for satellite-based quantum communications, say researchers
Teleportation is the extraordinary ability to transfer objects from one
location to another without travelling through the intervening space.
The idea is not that the physical object is teleported but the information
th... 阅读全帖 |
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s****y
发帖数: 18685 | 2 李天乐手头有货么
Caesium-137 is water-soluble and chemically toxic in small amounts. The biol
ogical behavior of caesium-137 is similar to that of potassium and rubidium.
After entering the body, caesium gets more or less uniformly distributed th
rough the body, with higher concentration in muscle tissues and lower in bon
es. The biological half-life of caesium is rather short at about 70 days.[4]
Experiments with dogs showed that a single dose of 3800 μCi/kg (approx. 44
μg/kg of caesium-137) is lethal ... 阅读全帖 |
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f****t
发帖数: 15913 | 5 rubidium clock的体积耗电不能做手表，它有硬盘那么大，耗电远远超过手表的能力，
手表里我怀疑连TCXO都不会做，体积成本限制太大。 |
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w**t
发帖数: 1037 | 6 有些高级DAC 有专门的外部时钟接口，可以接一台单独的时钟设备来提供稳定准确的时
钟信号。比如
Esoteric G-ORb Rubidium Master Clock Generator
据说比普通设备里的晶振的输出更准。 |
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z**h
发帖数: 382 | 7 这玩意在医院里用来给Gamma源校正用，搞不好泄漏出来的事故也是有的。
From Wiki
Caesium-137 reacts with water producing a water-soluble compound (caesium
hydroxide), and the biological behavior of caesium is similar to that of
potassium and rubidium. After entering the body, caesium gets more or less
uniformly distributed throughout the body, with higher concentration in
muscle tissues and lower in bones. The biological half-life of caesium is
rather short at about 70 days.[7] Experiments with dogs showed that a single
dose of 3... 阅读全帖 |
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s****y
发帖数: 18685 | 8 【 以下文字转载自 Military 讨论区 】
发信人: surely (雪里红◎内双), 信区: Military
标 题: 囤普鲁士蓝
发信站: BBS 未名空间站 (Sat Mar 19 01:17:53 2011, 美东)
李天乐手头有货么
Caesium-137 is water-soluble and chemically toxic in small amounts. The biol
ogical behavior of caesium-137 is similar to that of potassium and rubidium.
After entering the body, caesium gets more or less uniformly distributed th
rough the body, with higher concentration in muscle tissues and lower in bon
es. The biological half-life of caesium is rather short at about 7... 阅读全帖 |
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s****y
发帖数: 18685 | 9
biol
rubidium.
th
bon
4] |
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l*****o
发帖数: 19653 | 10 看看这篇文章吧（放狗搜的）：
http://www.economist.com/node/21548151
QUANTUM effects are vital to modern electronics. They can also be a damnable
nuisance. Make a transistor too small, for example, and electrons within it
can simply vanish from one place and reappear in another because their
location is quantumly indeterminate. Currents thus leak away, and signals
are degraded.
Other people, though, see opportunity instead. Some of the weird things that
go on at the quantum scale afford the possibility of doin... 阅读全帖 |
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R******d
发帖数: 5739 | 11
read,
quote
Saltiness
Saltiness is a taste produced primarily by the presence of sodium ions.
Other ions of the alkali metals group also taste salty, but the further from
sodium the less salty the sensation is. The size of lithium and potassium
ions most closely resemble those of sodium and thus the saltiness is most
similar. In contrast rubidium and cesium ions are far larger so their salty
taste differs accordingly.[citation needed] The saltiness of substances is
rated relative to sodium chlo... 阅读全帖 |
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l****y
发帖数: 4773 | 12 蛤蛤蛤蛤，屙彡冕屎冠又出儺禵鲓庵了，不过菴怼撘铷鎏，丫気鍀鞡了一圐圵，呙呙呙
呙~
google 翻译版:
Clams clams clams clams, defecate San crown crown feces and out Nuo Tikao Um
, but hate Da rubidium gilt Um, Genki Ya La technetium a Kudang, Guo Guo Guo
Guo ~ |
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H********g
发帖数: 43926 | 13 食我大清的俸禄，用明朝的王爷翻译我大清的元素，是不是应该满门抄斩啊
==
徐寿（1818年2月26日—1884年9月24日），字生元，号雪村，江苏无锡人，清末科学家
，中国近代化学的启蒙者。
徐寿幼时丧父，道光、咸丰年间放弃科考而研究科学。咸丰十一年为安庆军械所工程技
术人员，参与制造中国第一台蒸汽机和第一艘轮船。此船长五十余尺，速度为每小时四
十余里，命名为黄鹄；后在上海江南制造总局创办翻译馆并参与主持翻译西方科技书籍
工作，其译著有《化学鉴原》、《化学考质》、《西艺知新》、《化学求数》、《法律
医学》等；主要介绍西方近代化学，并创造汉字命名化学元素；在上海参与创办了中国
近代第一所教授科技的学校——格致书院，同时出版了中国第一份科技方面的期刊《格
致汇编》。
http://www.mwjx.com/bbs/html/276000/275774.html
每见到化学元素周期表，我总有种奇妙的感觉，想起从前背诵、默写“氢锂钠钾铷铯
钫……氦氖氩氪氙氡”的情景，并想到：别国学生用母语把“Hydrogeium，Lithium，
Natrium，Kalium，Rubidium，Caesium... 阅读全帖 |
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发帖数: 1 | 14 Best of Last Year—The top Phys.org articles of 2017
December 19, 2017 by Bob Yirka, Phys.org report
Study reveals substantial evidence of holographic universe
A sketch of the timeline of the holographic Universe. Time runs from left to
right. The far left denotes the holographic phase and the image is blurry
because space and time are not yet well defined. At the end of this phase (
denoted by the …more
It was another great year for science, particularly physics, as evidenced by
a study conducte... 阅读全帖 |
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P*****s
发帖数: 375 | 15 How the other half cools. Four years ago, researchers cooled rubidium atoms into a quantum-mechanical superparticle called the Bose-Einstein condensate, a stunning feat lauded as Molecule of the Year in 1995 (Science, 22 December 1995, p. 1902). This year, physicists at the same lab knocked over another milestone, cooling a vapor of ornery atoms in the first step toward creating an even more bizarre macroscopic quantum state.
Every particle of matter comes in one of two types: bosons and fermion |
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