x******i
发帖数: 3022 | 1 I think it's probably some oscillating component generating high frequency
hence short wavelength water waves with high amplitude --- the waves break
and become droplets. |
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a****e
发帖数: 296 | 2 高中的东西，具体早忘了
有仁兄记得用的是什么油吗？
查了最早的文献 millikan当年用的是 “钟表用油” 也不说个化学成分
谢谢啦 |
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w******a
发帖数: 2592 | 3 密里根伪造数据已经世人皆知了吧
原因是几十年后才发现当时用的油滴的粘滞系数是错的
然而密里根却得到了正确的数值，所以必然是伪造了数据 |
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a****e
发帖数: 296 | 7 也不能绝对这么说吧,粘滞系数的错误只会影响结果的绝对值
而相对的带电不连续性是他观测到的吧
我们不该以现在的技术条件来想象当年的实验环境... |
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m*****f
发帖数: 185 | 9 粘滞系数之差导致当时的结果1.592 × 10^−19columb与现在的标准结果之差。
剔除某些油滴的结果是有正当理由的。不是为了凑结果。如果所有油滴都考虑，结果也
差不多，只是误差范围大一点。 |
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a****e
发帖数: 296 | 10 不过这里的确是物理版
都没有人注意 或者想过 从化学的角度,电子和油滴分子在一起 是一种怎样的体系
这也是我想问大家用的都是什么油的缘故 |
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c****3
发帖数: 6038 | 13 不接地的金属也可以带静电
否则电器就不用接地了 |
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a****e
发帖数: 296 | 14 这个说的有点远了，难道一开始仁兄觉得有让小液滴接地的实验装置? |
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R*********r
发帖数: 1855 | 15 搞搞清楚再来喷吧。
密立根实验结果跟“油滴”的粘滞系数有什么关系？
密立根实验给出了两个结论：1. 电荷是离散化的，是基本电荷的整数倍；2. 给出了基
本电荷的值。你倒是说说他伪造数据是为了凑哪个结论？ |
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a****e
发帖数: 296 | 18 是啊，金属的话好理解，能带理论...
但是如果是油这样的有机物，共价键....
真的是加上了一个电子 还是上了一个带电基团？我不是很想得通...
这个问题其实很fundamental, 前些年science有篇文章 研究electron solvated by
water
molecules, half life 只有几十 fs.... |
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c****3
发帖数: 6038 | 19 带电基团似乎好一些
有机里带电的中间产物很常见 |
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s*****u
发帖数: 164 | 21 表面张力应该是从粒子间相互作用来的，第一种方法没考虑吧。
/3)
的2 |
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d****n
发帖数: 397 | 22 不是啊，可以把各种相互作用写出来，然后坐标变换成简振振动。
这样可以算出准确的配分函数。比如商业化的Gaussian 09就是这么
算的。但是这样算就是不能给出表面张力那一项，这是怎么回事？ |
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l*********k
发帖数: 43 | 23 【 以下文字转载自 Purdue 讨论区 】
发信人: littlechick (droplet), 信区: Purdue
标 题: Indiana版主可真嚣张
发信站: BBS 未名空间站 (Tue Mar 5 00:45:09 2013, 美东)
整整封了俺三个月
1 ★littlechick被取消在Indiana版的发文权限 deliver Dec
2 13 :45 0.36K
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5 ★... 阅读全帖 |
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l*********k
发帖数: 43 | 24 【 以下文字转载自 Purdue 讨论区 】
发信人: littlechick (droplet), 信区: Purdue
标 题: Indiana版主可真嚣张
发信站: BBS 未名空间站 (Tue Mar 5 00:45:09 2013, 美东)
整整封了俺三个月
1 ★littlechick被取消在Indiana版的发文权限 deliver Dec
2 13 :45 0.36K
2 ★deliver 解封 littlechick 在 Indiana 版 deliver Mar
2 05 :58 0.13K
3 ★littlechick被取消在Indiana版的发文权限 deliver Feb
15 07 :59 0.36K
4 ★deliver 解封 littlechick 在 Indiana 版 deliver Feb
15 05 :58 0.13K
5 ★... 阅读全帖 |
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l*********k
发帖数: 43 | 25 【 以下文字转载自 Purdue 讨论区 】
发信人: littlechick (droplet), 信区: Purdue
标 题: Indiana版主可真嚣张
发信站: BBS 未名空间站 (Tue Mar 5 00:45:09 2013, 美东)
整整封了俺三个月
1 ★littlechick被取消在Indiana版的发文权限 deliver Dec
2 13 :45 0.36K
2 ★deliver 解封 littlechick 在 Indiana 版 deliver Mar
2 05 :58 0.13K
3 ★littlechick被取消在Indiana版的发文权限 deliver Feb
15 07 :59 0.36K
4 ★deliver 解封 littlechick 在 Indiana 版 deliver Feb
15 05 :58 0.13K
5 ★... 阅读全帖 |
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a********e
发帖数: 3771 | 26 新年活动：
http://www.mitbbs.com/article_t/MedicalCareer/31309677.html
请站务给下列ID发包子，每人20个伪币。包子从版上金库支出。
Againstwind
Lzumc2008
Siyan
Stomach
Teabao
Usmle
Lchen7
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Hemocell
Dreamcatchin
Sunshadow
andyzzdlee
USMedEdu
Lypiupiu
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ihope
xiaobao99
clamchowder
shyj
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Springroamer
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droplets
fatsy
REDpersimmon
Yzjinjin
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seeker9
knockingdown
duckweed
ryxiang
roamer2
NOVA2009
Fionww
Kawalee
Acne
Yams
Kate2004
Lilx
祝新年快乐！ |
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m*********k
发帖数: 10521 | 27 [MedicalCareer] againstwind Dec 30. ● 【发吉祥包子】搞活动了搞活动了，麦地
新年总结
20*43=860
成功奖励 20 伪币的用户: againstwind, lzumc2008, siyan, stomach, teabao,
usmle, lchen7, harrywfu, hemocell, dreamcatchin, sunshadow, andyzzdlee,
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, springroamer, didiwo, Littlexin, pipi2006, ToBeNicer, xuyuan0219, droplets
, fatsy, REDpersimmon, yzjinjin, yeyetian, seeker9, knockingdown, duckweed,
ryxiang, roamer2, NOVA2009, kawalee, acne, yams, kate2004, |
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f**********n
发帖数: 246 | 28 After 72 hours, viral therapy will be very helpful. Air droplets could be
contagious as well( though the risk is minim).
Of course you can get the serology titer. However if I were LZ, I would not
take the risk anyway even I got good titer. I am a physician and a mother,
and I can feel it for the LZ.
LZ's mother can still come, but please wait for a few weeks. |
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I***i
发帖数: 14557 | 29 http://www.scientificamerican.com/podcast/episode.cfm?id=mosqui
Mosquitoes Navigate Rain by Not Caring
Mosquitoes are so light that speeding raindrops simply brush them aside
without imparting much force. Karen Hopkin reports
June 5, 2012
Have you ever wondered what happens to mosquitoes in the rain? A raindrop is
, like, 50 times heavier than those little suckers. So getting hit by one
has gotta hurt, right?
Well, not so much. Because researchers at Georgia Tech have found that the
bugs are so ... 阅读全帖 |
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c*******t
发帖数: 345 | 30 这张水珠给我有生命大感觉。
Russian photographer Andrew Osokin uses macro photography to capture tiny
water droplets |
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w*******y
发帖数: 60932 | 31 Cheapest price according to Camelcamelcamel.
Link:
http://www.amazon.com/Canon-MG5220-Wireless-Inkjet-4502B017/dp/
Maximum 9600 x 2400 color dpi with microscopic droplets as small as 1
picoliter
All new Full HD Movie Print software turns your favorite HD movie clips
captured with your compatible Canon EOS Digital SLR
Built-in 2-sided printing helps the environment and can cut your paper usage
by up to 50%
Print your photos wirelessly from compatible iPhone 3G, 3GS, iPod touch, and
iPad models
Bo... 阅读全帖 |
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s*****t
发帖数: 1994 | 33 Iridescent Clouds
Credit & Copyright: Arne Danielsen
Explanation: Why would clouds appear to be different colors? A relatively rare phenomenon
known as iridescent clouds can show unusual colors vividly or a whole spectrum of colors
simultaneously. These clouds are formed of small water droplets of nearly uniform size.
When the Sun is in the right position and mostly hidden by thick clouds, these thinner clouds
significantly diffract sunlight in a nearly coherent manner, with d |
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