s*****t
发帖数: 1994 | 1 Gomez's Hamburger: A Proto-Planetary Nebula
Explanation: What, in heaven, is that? Sometimes astronomers see things on the sky they
don't immediately understand. In 1985 this happened to Arturo Gomez, and the object became
known as Gomez's Hamburger for its distinctive yet familiar shape. After some investigation,
the object was identified as a proto-planetary nebula, a gas cloud emitted by a Sun-like star just
after its central hydrogen fuel has all been fused to helium. Gomez's Hamburger is on |
|
s*****t
发帖数: 1994 | 2 Two Hours Before Neptune
Credit: Voyager 2, NASA
Explanation: Two hours before closest approach to Neptune in 1989, the Voyager 2 robot
spacecraft snapped this picture. Clearly visible for the first time were long light-colored
cirrus-type clouds floating high in Neptune's atmosphere. Shadows of these clouds can even
be seen on lower cloud decks. Most of Neptune's atmosphere is made of hydrogen and
helium, which is invisible. Neptune's blue color therefore comes from smalle |
|
s*****t
发帖数: 1994 | 3 WIRO at Jupiter
Credit: A. Kutyrev (SSAI/GSFC), D. Rapchun(GST/GSFC), J. Norris(NASA/GSFC)
R. Canterna & R. Martin (U Wyoming)
Explanation: Gazing out over the mountaintops from the Wyoming InfraRed Observatory
(WIRO), astronomers recently recorded this bizarre looking image of the solar system's
ruling planet, gas giant Jupiter. The false-color picture is a composite of images taken to test a
sophisticated digital camera operating at liquid helium temperatures and sensitive |
|
i*******n
发帖数: 166 | 4 够倒霉的, X-ray Spectrometer的液氦给漏了
http://www.nasa.gov/mission_pages/astro-e2/main/index.html
The Suzaku spacecraft will help us to learn in more detail about the X-ray
sky.
Mission Status
After the successful launch of Suzaku on July 10, 2005, the X-ray Spectrometer
(XRS) was activated and performed to specifications for almost three weeks. On
July 29 the XRS experienced the first of a series of events associated with
helium gas entering the dewar vacuum space. On August 8 there were two such
event |
|
发帖数: 1 | 5 太阳 10 billion years.
红矮星 trillions of years.是太阳的1000 倍
https://en.wikipedia.org/wiki/Red_dwarf
It is believed that the lifespan of these stars exceeds the expected 10-
billion-year lifespan of our Sun by the third or fourth power of the ratio
of the solar mass to their masses; thus, a 0.1 M☉ red dwarf may
continue burning for 10 trillion years
Stellar models indicate that red dwarfs less than 0.35 M☉ are fully
convective.[3] Hence the helium produced by the thermonuclear fusion of
hydrogen is c... 阅读全帖 |
|
Z**R
发帖数: 1233 | 6 物理吸附？
from space.com
When the solar wind, the rapid stream of charged particles emitted by the
sun, strikes the moon, helium 3 is deposited in the powdery soil. Over
billions of years that adds up. Meteorite bombardment disperses the
particles throughout the top several meters ofthe lunar surface.
powerdy soil应该是有利于吸附。 |
|
a**********9
发帖数: 348 | 7 I don't think so.
Helium-3 on the moon is enough for US, Russia, European Union, Japan, China,
India, and many other countries to share.
The lunar probe competition will speed up the exploration of the moon. |
|
e**e
发帖数: 166 | 8 我们HPLC仪器需要接helium 一个female的adaptor。 但是1/4 还是1/2的口径是怎么定
义的。 我用尺子量的接口大概是1/2 inch，这就是需要的口径吗？ |
|
o**********y
发帖数: 1041 | 9 【 以下文字转载自 Chemistry 讨论区 】
发信人: orientalruby (orientalruby), 信区: Chemistry
标 题: 有关edwards pump的问题
发信站: BBS 未名空间站 (Thu Aug 25 21:15:45 2011, 美东)
请问哪里可以买到比较便宜的edwards pump?
实验室一pump，似乎对于pump helium gas 不是那么efficient,
对于其他气体则工作良好，请问这是什么原因 |
|
s******y
发帖数: 17729 | 10 【 以下文字转载自 Military 讨论区 】
发信人: rbs (jay), 信区: Military
标 题: 诺委会太不像话了 (转载)
发信站: BBS 未名空间站 (Wed Oct 4 10:58:51 2017, 美东)
发信人: rbs (jay), 信区: Joke
标 题: 诺委会太不像话了
发信站: BBS 未名空间站 (Wed Oct 4 10:23:52 2017, 美东)
尼玛87篇参考文献就不能加一篇施教授或能教授的CNS？
References
1. Ruska, E., Nobel Lectures, Physics 1981-1990, Tore Frängsmyr and
Gösta Ekspong, Eds. (1993) World Scientific Publishing, Singapore
2. Marton, L. (1934) Electron microscopy of biological objects. Nature
133, 911-911
3. Althoff, T., Mi... 阅读全帖 |
|
b*****r
发帖数: 203 | 11 I used to use HF solution to etch capillaries with helium flowing through
the capillary. I think it is more homogeneous. |
|
o**********y
发帖数: 1041 | 12 请问哪里可以买到比较便宜的edwards pump?
实验室一pump，似乎对于pump helium gas 不是那么efficient,
对于其他气体则工作良好，请问这是什么原因 |
|
|
m******i
发帖数: 834 | 14 1 June 2007
Inspired by work from the 1970s, scientists in the US, Russia and Ukraine
have developed a new way to produce bulk quantities of individual
nanoclusters. The "impurity-helium gas injection technique" can generate
isolated nanoclusters of noble gases, but it works for other elements too.
The results could be used to study the fundamental properties of
nanoclusters for use in catalysis and other industrial applications.
Nanometre-scale clusters have very different physical and chemical |
|
h****z
发帖数: 11 | 15 https://www.tcd.ie/Physics/vacancies/ultramicroscopy/
Ussher Assistant Professor in Ultramicroscopy
Post Status: 5-Year Contract with a view to permanency
Department/Faculty: School of Physics, Faculty of Engineering, Mathematics
and Science and Centre for Research on Adaptive Nanostructures and
Nanodevices (CRANN), Trinity College Dublin, the University of Dublin
Location: School of Physics, Trinity College Dublin, the University of
Dublin, Dublin 2, Ireland
Reports to: Head of School of Physic... 阅读全帖 |
|
g**********n
发帖数: 4 | 16 工作描述如下， 本人的背景跟这个位置非常match，简历基本cover所有discription，
已经在线投简历，还请有关前辈多多指点，帮忙再push一下简历给Hiring Manager就太
好了！先谢了.
（在线简历是个德文网站，还要browser翻译成英文，最离谱的是还提示要用“原始语
言”投简历，以便recruiter筛选，算是奇葩经历了）
Job Description A health care company with global reach. A product pipeline
filled to the brim. A team committed to scientific advancement. Think what's
possible. Novartis and its associated companies are always looking for
talented employees globally. We are engaged in advance preparation for
potential position openings.... 阅读全帖 |
|
a***k
发帖数: 1038 | 17 I thought cold fusion by electrolysis of heavy water using palladium
electrodes is a hoax, but now it seems it is real. DARPA and DOE are
sponsoring cold fusion again.
Arata-Zhang LENR Demonstration
By Steven B. Krivit
New Energy Times
May 22, 2008
OSAKA, JAPAN -- Against a monumental backdrop of bad publicity for cold
fusion since 1989, researchers in Japan on May 22 demonstrated the
production of excess heat and helium-4, the results of an historic low-
energy nuclear reaction experiment.
Yo |
|
|
d*b
发帖数: 21830 | 19 Incident in LHC sector 34
Geneva, 20 September 2008. During commissioning (without beam) of the
final LHC sector (sector 34) at high current for operation at 5 TeV, an
incident occurred at mid-day on Friday 19 September resulting in a large
helium leak into the tunnel. Preliminary investigations indicate that
the most likely cause of the problem was a faulty electrical connection
between two magnets, which probably melted at high current leading to
mechanical failure. CERN 's strict safety regul |
|
h*******o
发帖数: 1114 | 20 The energy of most stars results from the fusion of hydrogen nuclei to
helium nuclei. The temperature of the interior of the sun (a typical star)
is 15×10^6K. At this temperature, virtually no nuclei have enough kinetic
energy to overcome the electrostatic repulsion between nuclei and approach
each other closely enough to undergo fusion. Therefore, when Eddington
proposed in 1920that nuclear fuion is the source of stellar energy, his idea
was rejected. Explain why fusion does occur in stars, des |
|
w********o
发帖数: 10088 | 21 赶快去把我们实验室的PPMS重新启动一下，n久没清洁helium了
了。 |
|
g****g
发帖数: 1828 | 22 Question #2 is incorrect. The correct response is: B Your response was: D
[2] If a helium leak develops in your work area, proper evacuation
procedures would be:
[A] Pass the exit nearest the leak and use the next available
one if it exists.
[B] Activate and don your escape pack before ascending stairs or
ladders.
[C] Pass the exit nearest the leak, activate & don escape pack
prior to ascending the next exit.
[D] Immediately exit the nearest stairw |
|
s***e
发帖数: 5242 | 23 by Freeman Dyson
12/2010
In 1946 Subrahmanyan Chandrasekhar gave a talk at the University of Chicago
entitled “The Scientist.” 1 He was then 35 years old, less than halfway
through his life and less than a third of the way through his career as a
scientist, but already he wa reflecting deeply on the meaning and purpose of
his work. His talk was one of a series of public lectures organized by
Robert Hutchins, then the chancellor of the university. The list of speakers
is impressive, and included ... 阅读全帖 |
|
t******n
发帖数: 6242 | 24 今天无聊，看到这篇无聊的文章，就给你无聊地翻译成英文吧。
探索星系的捷径
A Shortcut to Galaxy Exploration
1. 问苍天情为何物？
1. Ask what love is heaven?
有人类的历史以来，人类就不断地探索自然，扩展了解自然的疆界。哥伦布发现新大陆
就是最好的例子。人类探索自然的勇气是从哪儿来的呢？来自人类情感的力量。那么，
情感是什么东西呢？这是千万年来，文学家探索的主题。在有一些文学家的眼中，物理
学家是没有情感的冷血动物。我就是一个物理学家。但是，我一点也不埋怨这些文学家
。虽然物理学家在自然界的探索中做出了伟大的贡献，但是，物理学家从来就没有给出
情感的物理定义是什么，也没有找到自然界蕴含情感的丝毫证据。所以，虽然人类知道
自己的生存发展跟自然环境是密不可分的，但是，很少有人类表达出对自然环境感谢的
情感。在很多人的眼中，自然界是死亡无情的物质世界。中国有一句古语，叫做“天若
有情天亦老”。因为几乎所有人类相信天是不老的，所以，认为苍天是没有情感的，就
不足为奇了。我提出了一个宇宙生长衰老的模型。虽然这个模型及其简单，能解释大多
... 阅读全帖 |
|
o**********y
发帖数: 1041 | 25 【 以下文字转载自 Chemistry 讨论区 】
发信人: orientalruby (orientalruby), 信区: Chemistry
标 题: 有关edwards pump的问题
发信站: BBS 未名空间站 (Thu Aug 25 21:15:45 2011, 美东)
请问哪里可以买到比较便宜的edwards pump?
实验室一pump，似乎对于pump helium gas 不是那么efficient,
对于其他气体则工作良好，请问这是什么原因 |
|
q*d
发帖数: 22178 | 26 Philip J. Wyatt
Wyatt Technology Corporation, Santa Barbara, California
A few years ago, Robert Fefferman, dean of physical sciences at the
University of Chicago, made an interesting remark. He mentioned that Enrico
Fermi, wanting to encourage individual creativity and innovation, required
his PhD students to select their problem, solve it, and submit the results
for publication in their name alone. Fermi also was aware that a multiauthor
paper with one famous author might receive automatic acce... 阅读全帖 |
|
b*********e
发帖数: 47 | 27 审稿求推荐
low temperature physics, quantum fluids and solids, especially helium
physics
谢谢各位啦 |
|
|
发帖数: 1 | 29 Phys. Rev. E 93, 066103 (2016) – Published 29 June
2016
In this Comment we point out some shortcomings in two
papers [N. Laskin, Phys. Rev. E 62, 3135 (2000); N.
Laskin, Phys. Rev. E 66, 056108 (2002)]. We prove
that the fractional uncertainty relation does not
hold generally. The probability continuity equation
in fractional quantum mechanics has a missing source
term, which leads to particle teleportation, i.e., a
particle can teleport from a place to another. Since
the relativistic kinetic en... 阅读全帖 |
|
f*******d
发帖数: 339 | 30
It is not meaningful, because then at large enough scale, such water would be
pulled togather by gravity to form planets or stars, which would undergo
nuclear reaction and produce other elements (water would be decomposed
to Hydrogen and Oxygen), and the intervening space is vacuum, just like ours.
(In our Universe, it is Hydrogen and Helium dominant). |
|
c*w
发帖数: 4736 | 31 Well, thanks buddies. But I think that only bolly know what I meant.
What I meant is the following:
the bubble is weightless, m=0;
But there's a force exerting on it, F=V*(rho)
F!=0, m=0, then a=F/m=infinity.
So its acceleration should be infinity.
However, it cannnot be infinity because it has to push the water
around it aside when it goes up. That is not because of friction,
otherwise in some liquid such as liquid helium, it is possible to
achieve frictionless, but not possible to achieve infi |
|
c******n
发帖数: 2 | 32 那位大侠有低温实验的经验，请给点指示：
我要在2K左右的温度做半导体电学测量，如果我的半导体样品的电阻约40ohm,
那么用多小的电流可以不加热样品。
比如1mA, 那么样品的发热功率是：P=I^2×R＝1×10-6×40＝0.04mW,
这样的发热功率是不是太大？样品的尺寸约5mm×5mm。
我的制冷系统是流动液氦（Helium Flowing)系统。
因为温度计是在制冷头上（cold finger)的，离样品还有一点距离，我一直怀疑，
样品的局部温度会高于温度计的读数。
急需大虾的指教，多谢。 |
|
m*********k
发帖数: 10521 | 33 [Music] musiclOa Dec 3 ● 知心哥走马上任当班务,感谢大家
10*67*1.1=737
成功奖励 10 伪币的用户: aboy, airdragon77, aniee, babbage, bigbaozi, clavichord, codycody, cranberry521, daguaibao, dudulook, firephoe, frada, FRJJ2009, fullbloom, gnilliar, guaichong, heidy, heisejinyao, helium, highouse, icecreammm, jaff1973, jjneimei, jlzhao1980, justit, L368, laofuzi, Lilia2009, lingyunxie, liujun, LXJSmonk, lyve1, M2007, maodaren, MissNN, musiclOa, mwang08, oriclechao, paotangde, peopleocean, pl6666, playdate, ponisa, QO |
|
a*********7
发帖数: 30080 | 34 申请版面: literature
活动链接:
http://www.mitbbs.com/article_t/Literature/31203975.html
以下ID每人10伪币,从版面扣:
jaff1973
SlowRabit
maodaren
airdragon77
wh
yangjin
AdvancedEdu
jingzx
maomaopaopao
dawangtoo
codycody
Ranma98
Doha2006
aniee
scoreboard
LaserJet
lateleo
winter
guaichong
playdate
AnnieAnita
ifulemitbbs
TrueCabbage
paotangde
FRJJ2009
Microsystem
bdll
dcw
dingdingboy1
crazyman
MyDream11
gybyj
oldgunblue
gnrhrules
Westmore
coconutnut
musiclOa
Jessicat
BattleMage
dudulook
aboy
helium
jsolomon
pascaldechi |
|
m******a
发帖数: 2930 | 35 注：1）版面活动：手续费无；2）代发包子：手续费10%:
1 版面活动，无手续费
代发版面/ID:
Music版
代发事由(主题标题或链接):
版面投票，所有投票并且留言的ID各得一个包子
http://www.mitbbs.com/article_t/Music/31292983.html
伪币金额:
下面每个ID一个包子
tillgot
gracesyy
wyou
jaff1973
RoyalMJ
wypt
nneeww
qiren85
prettyday
musiclOb
aniee
heisejinyao
dive
yiranpku
kuailewuzui
ISUguy
tamen23
beingfly
xnnt
aboy
musiclOa
loveandlabel
dolostone
yikeli
dudulook
helium
daguaibao
一共270伪币
奖励/代发包子数量:
27 |
|
m*********k
发帖数: 10521 | 36 [Music] deliver Apr 8. ● [公告] Music 版的投票结果
10*27=270
成功奖励 10 伪币的用户: tillgot, gracesyy, wyou, jaff1973, RoyalMJ, wypt, nneeww, qiren85, prettyday, musiclOb, aniee, heisejinyao, dive, yiranpku, kuailewuzui, ISUguy, tamen23, beingfly, xnnt, aboy, musiclOa, loveandlabel, dolostone, yikeli, dudulook, helium, daguaibao
扣除版面:(Music)270伪币成功 |
|
I***i
发帖数: 14557 | 37 http://www.wired.com/wiredscience/2012/12/panama-bug-count/
6,000 Insect Species Found in One Acre of Rainforest
（It took an army of committed scientists to get an accurate count of all
the arthropods in the San Lorenzo forest. Image: Jurgen Schmidl/University
of Erlangen）
A sweeping census involving more than 100 scientists and lasting almost a
decade has estimated that Panama’s San Lorenzo forest is home to an
estimated 25,246 arthropod species. The study is the most extensive survey
of insect... 阅读全帖 |
|
x*****n
发帖数: 3422 | 38 Rota Slipstream, 比Konig Helium什么的重一些，不过质量口碑好一些。
Star Spec评价很好的，和RE01R有一拚。可惜15它只有195/55R15，taller sidewall
hurts miata's autocross performance.
如果有你的合适size，推荐。
RT-615现在差很多了，其他也可以ebay搞的。找可能的卖家一个一个问（大seller/专
卖某个牌子/performance shop），有货的让他们list
个cashback以后60几块一个。 |
|
K******S
发帖数: 10109 | 39 看三星note 2 的的评论太欢乐了
11/01/2012, 10:22am By anonymous
that is like 33% of my car.
11/01/2012, 10:32am By anonymous
How is ur corolla?
11/01/2012, 10:34am By anonymous
Don't be hating on Corollas. They get great mpg. If you bought one, you
could afford this phone with what you save on gas.
11/01/2012, 10:35am By anonymous
Corolla is one of the most efficient and reliable cars for the money.
11/01/2012, 10:39am By anonymous
Good to know that you are able to save a lot of gas money, but be wise, don'... 阅读全帖 |
|
w*******y
发帖数: 60932 | 40 2-Channel Air Swimming RC Fun Inflatable Floating Flying Angry Birds
Features
Brand New 2-Channel Air Swimming RC Fun Inflatable Floating Flying Angry
Birds
Compact, fantastic and inventive design
Features automatically forward, up, down, turn left right
2-Channel flying Angry Birds Air Swimmers
Filled with gas helium, and powered by 4xAAA batteries (not include)
The Air Swimmers swim through the air with incredibly smooth and life-like
motion
2-Channel Air Swimming RC Fun Inflatable Floating Fl... 阅读全帖 |
|
u****u
发帖数: 2308 | 41 Scientists warn Eyjafjallajokull could trigger the Katla volcano to
erupt
http://www.helium.com/items/1811384-scientists-warn-eyjafjallajokull-
could-trigger-the-katla-volcano-to-erupt
Katla has been dormant for decades, but since the eruption of
Eyjafjallajokull , it has seen a 200% increase in activity. Katla last
erupted in tandem with Eyjafjallajokull in an 1821 blast, a pattern
scientists say may recur now. Katla last erupted on its own in 1921 and
experts say that the volcano is presently |
|
f**********r
发帖数: 18251 | 42 【 以下文字转载自 ChinaNews 讨论区 】
发信人: helium (unkown), 信区: ChinaNews
标 题: 【丁子霖丑闻】文革女干将，还有杀夫另嫁、贪污嫌疑
发信站: BBS 未名空间站 (Fri Jun 8 23:48:43 2007)
这个是猛料了，北京的同志们辩一辩，真的假的？
发信人: weibaobao (baobao), 信区: ChinaNews
标 题: 丁子霖的丑闻
发信站: BBS 未名空间站 (Fri Jun 8 23:30:59 2007)
丁子霖你缺德不缺德？死难者的救济款都到哪儿去了？黄殿宫真的是自杀吗？
黄綮星（丁子霖前夫家属）
2004年6月4日
丁子霖女士：
你也许听说过我，我的名字叫黄綮星，算来跟你有点亲戚关系。虽然我的表叔黄殿宫已
死多年，但他冤魂不散。今天是他的生日，我给你提三个问题，很想知道你的感受。
黄殿宫真的是自杀吗？
说到这个问题，也许你感到万分惊恐。你一定记得，你中学毕业后到煤炭工业部销售局
工作，在那里认识了同事黄殿宫，黄为人忠厚老实。虽然出身贫寒，中学学历，但对新
到单位的你十分照顾，你们相处有了感情， |
|
s*****t
发帖数: 1994 | 43 Gomez's Hamburger: A Proto-Planetary Nebula
Explanation: What, in heaven, is that? Sometimes astronomers see things on the sky they
don't immediately understand. In 1985 this happened to Arturo Gomez, and the object became
known as Gomez's Hamburger for its distinctive yet familiar shape. After some investigation,
the object was identified as a proto-planetary nebula, a gas cloud emitted by a Sun-like star just
after its central hydrogen fuel has all been fused to helium. Gomez's Hamburger is on |
|
s*****t
发帖数: 1994 | 44 Two Hours Before Neptune
Credit: Voyager 2, NASA
Explanation: Two hours before closest approach to Neptune in 1989, the Voyager 2 robot
spacecraft snapped this picture. Clearly visible for the first time were long light-colored
cirrus-type clouds floating high in Neptune's atmosphere. Shadows of these clouds can even
be seen on lower cloud decks. Most of Neptune's atmosphere is made of hydrogen and
helium, which is invisible. Neptune's blue color therefore comes from smalle |
|
s*****t
发帖数: 1994 | 45 WIRO at Jupiter
Credit: A. Kutyrev (SSAI/GSFC), D. Rapchun(GST/GSFC), J. Norris(NASA/GSFC)
R. Canterna & R. Martin (U Wyoming)
Explanation: Gazing out over the mountaintops from the Wyoming InfraRed Observatory
(WIRO), astronomers recently recorded this bizarre looking image of the solar system's
ruling planet, gas giant Jupiter. The false-color picture is a composite of images taken to test a
sophisticated digital camera operating at liquid helium temperatures and sensitive |
|
i*******n
发帖数: 166 | 46 够倒霉的, X-ray Spectrometer的液氦给漏了
http://www.nasa.gov/mission_pages/astro-e2/main/index.html
The Suzaku spacecraft will help us to learn in more detail about the X-ray
sky.
Mission Status
After the successful launch of Suzaku on July 10, 2005, the X-ray Spectrometer
(XRS) was activated and performed to specifications for almost three weeks. On
July 29 the XRS experienced the first of a series of events associated with
helium gas entering the dewar vacuum space. On August 8 there were two such
event |
|
