i***y
发帖数: 246 | 1 组里一直招不到这个方向的人 不知道版上有没有人做这个方向,可能比较偏吧 感兴趣
的给我发信p****[email protected] 会告知更详细的信息
Required Experience
BSME with fluids/thermal background and cryogenic engineering experience (
minimum 5 years).
Experience working with cryogenic equipment and systems
Strong background in heat/mass transfer and/or solid mechanics
Experience developing, conducting and interpreting experiments
Experience in an industrial R&D setting
Demonstrated creativity in engineering solutions
Experience with FEA, CFD analysis
Experience... 阅读全帖 |
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g****3
发帖数: 3 | 2 诚求Lake Shore Cryogenics 内推一个summer intern
多谢~ |
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N***i
发帖数: 4104 | 3 你个文科傻妞就不要在我这种天天搞液氮液氦为生的屁挨着地面前班门弄斧了
简单的给你说，东西放倒cryogen里面，降温有多快，关键是这个东西本身他自己的导
热能力，也就是说从表面到内部之间能维持多大的温度梯度，维持多久。比方说液氮温
度是77K，一般大小形状的东西浸入液氮中，大约一分钟内就可以建立稳定的温度场，
物体表面的液氮沸腾状况趋于稳定，这个时候物体表面温度基本上已经降到100K附近了
，即使你故意在物体中间安个热源也不会有多大用，除了更快的烧掉液氮。
这个过程中你要考虑的是液氮的汽化热，和沸腾产生氮气的溢出路径（这个很关键）。
cryogen本身的热导率关系几乎没有，因为对流（包括沸腾气体）才是热交换的主要途
径。你扯神马水的热导系数，可见你丫就是一文科傻妞胡思乱想。 |
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m*****u
发帖数: 15526 | 4 冻胚胎冻器官对哺乳动物都没有问题。这就行了。器官移植几个月还是能拖的。几个月
之内让冻存胚胎长出成熟器官没什么问题。
http://www.cryonics.org/about-us/faqs
Has any mammal been cyropreserved and revived?
Not to cryogenic temperatures. Dogs and monkeys have had their blood
replaced with protective solution and cooled to below 0ºC, with
subsequent rewarming and revival. Nematode worms have been cryopreserved in
liquid nitrogen (−196ºC), and subsequently revived. At the July
2005 Society for Cryobiology Conference, it was announced that a ra... 阅读全帖 |
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j**l
发帖数: 486 | 5 https://www.nasa.gov/press-release/nasa-announces-new-tipping-point-
partnerships-for-moon-and-mars-technologies
凭啥只给 SpaceX 3米， 而给了 Blue Origin 10 米？
Cryogenic Propellant Production and Management
• Blue Origin LLC of Kent, Washington, $10 million
A ground demonstration of hydrogen and oxygen liquefaction and storage,
representing rocket and spacecraft propellant that could be produced on the
Moon. The demonstration could help inform a large-scale propellant
production plant suitable fo... 阅读全帖 |
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k******6
发帖数: 7 | 6 Postdoctoral Research Associate Position - Mesoscopic Transport in Two-
Dimensional Materials
Oak Ridge National Laboratory
Oak Ridge, TN
ORNL12-114-CNMS
Project Description:
The Functional Hybrid Nanostructures group at the Center for Nanophase
Materials Sciences (CNMS) at Oak Ridge National Laboratory is seeking to
fill a postdoctoral research position in a project focused on the mesoscopic
charge transport properties of quasi-two-dimensional (2D) materials and
their device applications. This ... 阅读全帖 |
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a**v
发帖数: 406 | 7 There are two sperm banks in Boston
New England Cryogenic Center, Inc.
Serving the Boston Area. (866) 264-3066
New England Cryogenic Center
665 Beacon St, Boston, MA 02215 (800) 991-4999 |
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b***n
发帖数: 13455 | 8 ☆─────────────────────────────────────☆
Lathander (长亭树，枝头香絮) 于 (Sun Jan 23 21:53:21 2011, 美东) 提到:
待会转到版面
☆─────────────────────────────────────☆
cmspu (毛豆他叔) 于 (Sun Jan 23 21:53:32 2011, 美东) 提到:
re
☆─────────────────────────────────────☆
jasonliu2008 (jason) 于 (Sun Jan 23 21:53:32 2011, 美东) 提到:
re
☆─────────────────────────────────────☆
andysun (nn) 于 (Sun Jan 23 21:53:33 2011, 美东) 提到:
re
☆─────────────────────────────────────☆
Roethlisberg (Big Ben) 于 (Sun Jan 23 21:53:... 阅读全帖 |
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b***n
发帖数: 13455 | 9 ☆─────────────────────────────────────☆
HeeHaw (嘻哈阿公) 于 (Mon Jan 24 23:10:21 2011, 美东) 提到:
>100个包 子 for the person who can guess the exact combined score for the
Super Bowl this year. (I have 100个包 子 only. Sorry!)
>You also need to pick the winner (Green Bay or Pittsburgh) of Super
Bowl in case there is a tie.
>There will not be any correction once I have recorded it unless I
corrected the error before game time.
>One guess per person.
>The first tie breaker is the exact total plus winner ... 阅读全帖 |
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l**********1
发帖数: 5204 | 10 Please try go to
//www.emsdiasum.com/microscopy/products/cryofixation/cryogenic_labels.aspx
Cryogenic Labels, Tags, and Markers
Laser Cryo-Babies® and Cryo-Tag®
Labels for Cryogenic Storage
Temperature-Resistant – From -196°C to 150°C. Cryo-Babies and Cryo-Tags withstand freezer
temperatures down to -196°C (liquid and vapor phase nitrogen), boiling water baths (100°C), autoclaving
and moderate oven temperatures (150°C).
8. Laser Cryo-Tags Tough-Spot Set
77574-W White 68 4 17 1,360 60.0... 阅读全帖 |
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a******h
发帖数: 255 | 11 Recommend Apiezon® N Cryogenic High Vacuum Grease.
It is better than Dow Corning High Vacuum Grease at low temperature.
You can find information about it by the following link: http://www.apiezon.com/cryogenics.htm
It works well in our experiments down to 50 mK.
Quantum Design also recommends to use Apiezon® N grease in their PPMS
system.
In electrical measurement, silver paste may short the sample and holder, may
not be the best choice. |
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g****g
发帖数: 1828 | 13 发现号航天飞机（STS Discovery OV-103）是美国国家航空航天局（NASA）肯尼迪太空
中心（KSC）旗下，第三架实际执行太空飞行任务的航天飞机。首次飞行是在1984年8月
30日，负责进行各种科学研究与作为国际太空站计划的支援。于2011年3月9日执行完
STS-133任务后退役。
目录
[隐藏]
* 1 命名
* 2 建造
* 3 历次任务
* 4 参考文献
* 5 外部链接
[编辑] 命名
发现号的命名，源自于一艘18世纪时的英国探险船，伴随著名的詹姆斯·库克船长远征
南太平洋的发现号（HMS Discovery）。在库克船长的探险中，完成了包括发现夏威夷
群岛、新西兰乃至于确认澳洲大陆存在等的功绩，而同行中的另外一艘探险船奋进号（
HMBarque Endeavour）也成为NASA另一架航天飞机奋进号的命名由来。除此之外，库克
船长也曾搭乘发现号探索南阿拉斯加与西北加拿大之间的海岸线，虽然当时正值美国独
立战争期间，英国与美国是交战国，但由于发现号在从事的是非常重要的科学任务，本
杰明·富兰克林甚至特别下达美军不准对该船发... 阅读全帖 |
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c****h
发帖数: 4968 | 14 当然不乏鼓催印度处处领先的人，就不转了。但明白人还是不少的。其实中三、中倭棒
之间的不愉快都是白人挑起的。
http://timesofindia.indiatimes.com/world/china/China-completes-
“I know some of my brothers may feel offended or angry of what i just wrote
, but its just a fact many of us know we are far behind China, its is only
by recognising your failures and position vis a vis others that you can
strive to improve yourself, SO in a way i'm happy to see that we have a
neighbour like China, which we can look up to and strive to compete with,
since this wi... 阅读全帖 |
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D**S
发帖数: 24887 | 15 Like this one:
Krishnan (Gujarat)
5 hrs ago (05:22 AM)
I know some of my brothers may feel offended or angry of what i just wrote,
but its just a fact many of us know we are far behind China, its is only by
recognising your failures and position vis a vis others that you can strive
to improve yourself, SO in a way i'm happy to see that we have a neighbour
like China, which we can look up to and strive to compete with, since this
will uplift us even without us knowing. I think that if we didn't h... 阅读全帖 |
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f*****g
发帖数: 9098 | 16 肯定的
咱英文是 第二语言，学得再好也没人家 native speaker单词量大
光靠背红宝书认识几个 cryogenic这种专业词，屁用没有
native speaker生活用词比咱懂得太多 |
|
g**1
发帖数: 10330 | 17 ISRO calls off GSLV launch after fuel leak
M. DINESH VARMA
http://www.thehindu.com/news/national/isro-calls-off-gslv-launc
The Indian Space Research Organisation (ISRO) will now go back to the
drawing board to plug imperfections in its indigenous cryogenic upper-stage
Geosynchronous Satellite Launch Vehicle (GSLV) programme, after the GSLV-D5
mission to launch into orbit the advanced communication satellite GSAT-14,
was aborted due to a fuel leak on Monday.
The mission was called off at a fairly... 阅读全帖 |
|
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R********r
发帖数: 3415 | 19 我日：时间长了还是会很凉
cryogenic burn is same as heat burn |
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g**1
发帖数: 10330 | 20 http://timesofindia.indiatimes.com/home/science/Chinas-first-lu
三哥教授对中国登月的评价：
. R.K. Sarkar (KOLKATA)
4 hrs ago
For scientists and technical people this is no great achievement. Analyze
the Chinese space program critically. China does not have genuine cryogenic
technology. The space capsule (used buy China) or manned missions were 1960s
versions bought from Russia. Russia was keen to get rid of this junk.
Indian's probe on the moon was much more successful than the earlier Chinese
missions and w... 阅读全帖 |
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d****o
发帖数: 32610 | 21 三哥ok 恭喜三哥
cryogenic
1960s
Chinese |
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T**********e
发帖数: 29576 | 22
nasa造火箭用的那些contractor都太贵了，shuttle一个出发点是降低成本，但是越搞
越贵。spacex的现在路子是主要自造，有的直接拿nasa的技术自己造。
Significantly, the Merlin engines—like roughly 80 percent of the components
for Falcon and Dragon, including even the flight computers—are made in-
house. That’s something SpaceX didn’t originally set out to do, but was
driven to by suppliers’ high prices. Mueller recalls asking a vendor for an
estimate on a particular engine valve. “They came back [requesting] like a
year and a half in development and hundred... 阅读全帖 |
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d*b
发帖数: 21830 | 23 铝粉液氧都是常见的玩意，这玩意就是技术要求高,一般人玩不了cryogenics |
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T**********e
发帖数: 29576 | 24 ULA的新Vulcan火箭要只回收一级发动机，燃料罐就扔了，发动机分离后打开一个防热
罩，然后降落伞减速，直升飞机半空中捕捉。
A sample illustration of mid-air recovery of main engine section.
ULA chief explains reusability and innovation of new rocket
CAPE CANAVERAL — United Launch Alliance will salvage the main engines
through a mid-air recovery plan and reuse them again aboard the company’s
new Vulcan rocket, saving 90 percent in booster propulsion costs, the
company announced Monday.
It is dubbed SMART Reuse, or Sensible Modular Autonomous Return Techno... 阅读全帖 |
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f******t
发帖数: 19544 | 25 一万年太久，只争朝夕。
http://spacenews.com/nasa-to-study-launching-astronauts-on-first-sls-mission/
NASA to study launching astronauts on first SLS mission
by Jeff Foust — February 15, 2017
WASHINGTON — NASA plans to study putting astronauts on the first launch of
its Space Launch System heavy-lift rocket, a move that could introduce new
delays and other complications into the vehicle’s development.
NASA Acting Administrator Robert Lightfoot, in a speech at the Space Launch
System/Orion Suppliers Conferen... 阅读全帖 |
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r*s
发帖数: 2555 | 26 Brendt Christensen
Brendt Christensen
PhD Candidate at University of Illinois at Urbana-Champaign
Champaign, IllinoisResearch
Current
University of Illinois at Urbana-Champaign
Previous
University of Wisconsin-Madison
Education
University of Illinois at Urbana-Champaign
14
connections
View Brendt’s full profile. It's free!
Your colleagues, classmates, and 500 million other professionals are on
LinkedIn.
View Brendt’s Full Profile
Summary
I am a PhD candidate in experimental condensed ma... 阅读全帖 |
|
发帖数: 1 | 27 还硬熬什么啊
金属本身是无法做c14鉴定，但是古代制造过程不可能像现代这样有纯净的环境，所以
掺些杂质进去是不可避免的
“For the case of iron-based materials, van der Merwe and Stuiver2 first
demonstrated that it was feasible to extract the carbon from different iron-
based materials and use it to establish their age using radiocarbon dating.
A total of 15 samples of iron-based materials were dated by beta counting at
Yale University2,3 using a dependable method to extract carbon from iron
utilizing flow-through combustion in oxygen with cryogenic trappi... 阅读全帖 |
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发帖数: 1 | 28 还是全贴出来 让大家自己看吧
Current Equipment
The laboratory currently has the following electron microscopes:
Zeiss Crossbeam 540 FIB-SEM
Hitachi S-4300 high resolution field emission SEM1 (Acquired through NSF
Major Research Instrumentation Program. Award #0421032)
Hitachi H-8100 scanning transmission electron microscope (STEM)
Hitachi S-3400
Hitachi S-5000 ultra-high resolution scanning electron microscope (UHRSEM)
Hitachi S-7650 TEM
Analytical Equipment for the microscopes includes:
Hitachi S-4300VP (Pro... 阅读全帖 |
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发帖数: 1 | 29 中美液氢产业差距：美国产能全球首位，中国民用一片空白
液氢是通过预冷和膨胀节流等工艺，把氢气降温到-253℃从而变成液体，密度可达普通
氢气的780倍，使得氢可以高效地储存和运输。液氢液氧推进剂的比推力最高，相同比
推力时运载火箭的重量可以下降50%，因此液氢是最先进的火箭推进剂燃料。同时，在-
253℃低温下，除了氦、氖稀有气体之外的所有气体杂质都会凝固分离，因此液氢汽化
很容易获得6N(99.9999%)及以上的超纯氢。相比于钯膜纯化等气态氢提纯技术，液氢具
有应用系统简单、经济、高效可控、不易污染、品质稳定等特点。因此液氢还是全球公
认的可以大规模获得超纯氢的先进技术。
超纯氢在电子工业尤其是微电子、光电子产品生产中有极为广泛的的应用市场，包括大
规模集成电路芯片、平板显示器、光伏电池等战略性新兴产业。电子工业是超纯氢的最
大用户，超纯氢作为还原气体和保护气，主要用于半导体器件、集成电路芯片以及液晶
平板显示器生产等领域，且氢气的纯度直接影响最终的产品质量。在冶金工业中，氢气
可作为还原剂将金属氧化物还原成金属，也可作为贵金属高温加工时的保护气氛，需要
5N的高纯氢。同时在石油炼... 阅读全帖 |
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v**e
发帖数: 8422 | 30 中国重型运载火箭技术方案
|字号
2010年10月，一个振奋人心的消息从北京传来。国家启动了重型运载火箭技术方案论证
其实我感兴趣的就是这一句而已。论证已经开始了，我们这代人有生之年肯定可以看到
我国载人登月和登陆小行星的壮观场面！
http://www.spacechina.com/xwzx_jcdt_Details.shtml?recno=74451
航天科技四院调动优势资源研制大推力固体运载发动机
日期：2011/04/01
中国航天科技集团公司四院的设计师们正在研讨固体发动机技术
3月是春风吹拂的季节。今年全国“两会”召开不久，一份“关于加快我国大型固
体运载火箭发动机研制步伐”议案的答复文件从北京传到位于西安的中国航天科技集团
公司四院，全国人大代表、该院42所研究员马国富去年向全国“两会”提交的议案得到
了回复。
答复函中，国防科工局表示，国家正在组织统筹论证大型固体火箭发动机技术未来
如何应用，并考虑将技术研究工作纳入我国航天“十二五”发展规划，力争突破核心关
键技术。国防科工局还表示，全力支持加快我国固体动力事业的发展。
对标一流 直面差距
固体动力是航天运载... 阅读全帖 |
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r********n
发帖数: 7441 | 31 要被三哥嘲笑了
cryogenic engine ? |
|
发帖数: 1 | 32 马斯克透露，将很快开始测试星际载人飞船系统， 推力是土星五的两倍！
Musk: Atmospheric tests of interplanetary spaceship could happen next year
March 13, 2018 Stephen Clark
Artist’s concept of the BFR spaceship deploying a satellite in orbit.
Credit: SpaceX
A team of SpaceX engineers is building a prototype of the spaceship Elon
Musk hopes will one day carry people and cargo deep into the solar system,
and it could begin low-altitude testing next year, kicking off a multi-step
test campaign before eventually going into space, the... 阅读全帖 |
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M*V
发帖数: 3205 | 33 印度地球同步衛星咻d火箭升空
【中央社╱新德里5日專電】
2014.01.05 07:42 pm
印度的地球同步衛星咻d火箭下午升空。隨3節式火箭的不同節陸續脫離，印度太空研究
組織控制室不斷傳出掌聲。2010年兩度失敗後，今天任務甚至比火星任務更受關注。
經29小時倒數計時，印度太空研究組織（IndianSpace Research Organisation, ISRO
）的「D5」地球同步衛星咻d火箭（GSLV）今天下午4時18分（台北時間晚間6時48分）
從南印安德拉省（Andhra Pradesh）斯利哈里柯塔島的達萬太空中心順利升空。
ISRO主席拉哈克里希南（K. Radhakrishnan）已宣布任務成功。
耗資35億6000萬盧比（約5725萬美元）的這項發射任務有兩個主要目的，測試國造低溫
火箭發動技術以及在發射17分鐘後，將1980公斤重的通訊衛星GSAT-14送入地球同步軌
道。
GSLV是印度較大型火箭，49公尺長、415噸重。印度媒體報導，這相當於要把80頭成年
大象帶入太空，難度可見一斑，發射任務更讓ISRO「既期待又怕受傷害」。
2001到2010年間7度... 阅读全帖 |
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l****d
发帖数: 131 | 34 第一次搞走了些弯路，最终大功告成。再也没有高速刹车抖动了。
买了有slot 和 Cryogenics工艺的rotor比普通的贵不少，看了很多review.看来很不错
，应该不会再warp了。
pads 买的EBC green据说相对softer. |
|
D**********s
发帖数: 3139 | 35 工艺是早就淘汰的了，可能texas instrument之类的零星产品还在用。不过这个QC和个
人用户也没有太大关系。
题外话，这玩意肯定特费电。。。cryogenic。。。 |
|
q**x
发帖数: 1636 | 36 I am a consultant in Houston, TX; Oil and Gas companies retain our firm to
find qualified candidates for their open positions. I wanted to see if you
or anyone you know may be interested in a Heat Transfer Engineer role with
one of my clients?
My client is a leading international supplier and licensor of process
technology, catalysts, adsorbents, process plants, and consulting services
to the petroleum refining, petrochemical and gas processing industries.
Attached you will find the role specifi... 阅读全帖 |
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r********r
发帖数: 1460 | 37 My insurance is also bcbs.
did you check your handbook? In my handbook, it says:
Limitations and Exclusions
In addition to the limitations and exclusions set out in the description of
What the Medical Plan Covers, beginning on
page 18, ***** does not cover medical expenses for the following:
40. Non-covered Durable Medical Equipment includes,
but is not limited to, air conditioner, air purifier,
breast pump, cryogenic machine, humidifier,
physical fitness equipment, and whirlpool bath
equipment.... 阅读全帖 |
|
k******6
发帖数: 7 | 38 Postdoctoral Research Associate Position in
Synthesis and Characterization of Two-Dimensional Organic Materials
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
Reference Code: ORNL12-76-CNMS
Project Description
The Functional Hybrid Nanostructures group at the Center for Nanophase
Materials Sciences (CNMS) at Oak Ridge National Laboratory is seeking to
fill a postdoctoral research position in a project focused on the synthesis
of two-dimensional (2D) materials, similar to ... 阅读全帖 |
|
发帖数: 1 | 39 大家好，
本人MSE PhD，毕业1年，现从事Materials Scientist工作。PhD期间的主要研究方向是
superconducting and magnetic materials的材料制备和表征，包括了
superconductors（wire，thin film and bulk）,也做过很多magnet相关的工作。材料
制备包括PVD，CVD，ALD，Solid State Synthesis, High Temperature/Pressure
Reaction；材料表征经验包括SEM/FIB/TEM/STEM，XRD/XRR/XPS，magnetization，
transport test，cryogenic test等等。有10篇Jounal Publications和10次
conference presentations经验。有过几篇审稿经验，如有需要可以提供cv+linkedin。
为绿卡申请做准备，求各位前辈大神帮忙推荐审稿机会，非常感谢！
可以直接站内联系，也可以邮箱:[email protected]/* */ |
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f**********1
发帖数: 203 | 40 – “My company, CryoSitters, is developing a way to cryogenically freeze
children for short periods of time to help parents that cannot find
babysitters, with plans to eventually package our technology in affordable
home kits.”
– “My company RG Media makes videos that help you avoid murdering whatever
brain cells are left in your skull after a lifetime listlessly flipping
through 500 channels without finding a god damm thing by secretly replacing
your regular routine video experience with stuff t... 阅读全帖 |
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发帖数: 1 | 41 大家好，
本人MSE PhD，毕业1年，现从事Materials Scientist工作。PhD期间的主要研究方向是
superconducting and magnetic materials的材料制备和表征，包括了
superconductors（wire，thin film and bulk）,也做过很多magnet相关的工作。材料
制备包括PVD，CVD，ALD，Solid State Synthesis, High Temperature/Pressure
Reaction；材料表征经验包括SEM/FIB/TEM/STEM，XRD/XRR/XPS，magnetization，
transport test，cryogenic test等等。有10篇Jounal Publications和10次
conference presentations经验。有过几篇审稿经验，如有需要可以提供cv+linkedin。
为绿卡申请做准备，求各位前辈大神帮忙推荐审稿机会，非常感谢！
可以直接站内联系，也可以邮箱:[email protected]/* */ |
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w*******s
发帖数: 91 | 42 【 以下文字转载自 Chemistry 讨论区 】
发信人: wqzmitbbs (wqzmitbbs), 信区: Chemistry
标 题: 求推荐为RSC杂志审稿
发信站: BBS 未名空间站 (Thu May 30 12:14:38 2013, 美东)
本人已有rsc审稿人帐号, 可是一直没有收到过审稿邀请.
恳请版上前辈推荐审稿机会.
手头有CV, 随时发给您参考.
叩谢!感激不尽!
电邮: wqzmitbbs_AT_gmail.com
合适方向:
生物物理(biophysics),
物理化学(physical chemistry),
蛋白质动力学(protein dynamics, enzyme kinetics),
血红素蛋白/卟吩的结构功能 (heme protein structure and function, porphyrins)
光化学/物理(photochemistry, photophysics)
激光光谱学, 拉曼/红外光谱(laser spectroscopy, Raman / FTIR)
非弹性x-射线散射(inelastic x-ray scat... 阅读全帖 |
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q**x
发帖数: 1636 | 43 【 以下文字转载自 JobHunting 讨论区 】
发信人: quix (uglyDuck), 信区: JobHunting
标 题: Opportunity/Referral - Heat Transfer Engineer
发信站: BBS 未名空间站 (Mon Aug 26 15:39:06 2013, 美东)
I am a consultant in Houston, TX; Oil and Gas companies retain our firm to
find qualified candidates for their open positions. I wanted to see if you
or anyone you know may be interested in a Heat Transfer Engineer role with
one of my clients?
My client is a leading international supplier and licensor of process
technology, catalysts, ... 阅读全帖 |
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h*h
发帖数: 18873 | 44 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: newegg06 (egg), 信区: SanFrancisco
标 题: 三锅有时候还是蛮可爱的 (转载)
发信站: BBS 未名空间站 (Mon Jun 18 15:35:22 2012, 美东)
发信人: Closingbell (CB), 信区: Military
标 题: 三锅有时候还是蛮可爱的
发信站: BBS 未名空间站 (Mon Jun 18 13:35:55 2012, 美东)
我喜欢
Gurjit Singh (Moon) 1 day ago
This is just elementary work. Indians will land on the Moon by 2016 with our
PSLV-c19 super rocket. Chinese won't get there for 30 years.
badegg (US) 1 day ago
I think this is a fake event fabricated by Chinese gov as usual. It is... 阅读全帖 |
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n******6
发帖数: 1829 | 45 【 以下文字转载自 Military 讨论区 】
发信人: Closingbell (CB), 信区: Military
标 题: 三锅有时候还是蛮可爱的
发信站: BBS 未名空间站 (Mon Jun 18 13:35:55 2012, 美东)
我喜欢
Gurjit Singh (Moon) 1 day ago
This is just elementary work. Indians will land on the Moon by 2016 with our
PSLV-c19 super rocket. Chinese won't get there for 30 years.
badegg (US) 1 day ago
I think this is a fake event fabricated by Chinese gov as usual. It is too
good to be true for a country that is lagging behind India in economy,
technology and education. Especiall... 阅读全帖 |
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c*********l
发帖数: 3438 | 46 三哥教授对中国登月的评价：
. R.K. Sarkar (KOLKATA)
4 hrs ago
For scientists and technical people this is no great achievement. Analyze
the Chinese space program critically. China does not have genuine cryogenic
technology. The space capsule (used buy China) or manned missions were 1960s
versions bought from Russia. Russia was keen to get rid of this junk.
Indian's probe on the moon was much more successful than the earlier Chinese
missions and we placed our flag on the moon soil. A probe to Mars is much
toug... 阅读全帖 |
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b******o
发帖数: 5644 | 47 Knife Steels Steel Type Characteristics Approximate Rockwell
Hardness
10A also referred to as AUS-10. 60
17-7 PH Good corrosion resistance, excellent for water sports
applications. This alloy is a chromium-nickel-aluminum precipitation
hardening stainless steel with good edge retention. Great corrosion
resistance generally means a high chromium content, and this means knives
made with this steel will be a little harder to sharpen than blades with a
lower chromium content.... 阅读全帖 |
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x****u
发帖数: 12955 | 48
Once cryogenic storage is possible, you don't really care how long it takes
to get there. |
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H********g
发帖数: 43926 | 49 Atomic structure of sensitive battery materials and interfaces revealed by
cryo–electron microscopy
。。。 yi cui
Frozen in time
The electrochemical processes occurring in a battery are highly dynamic. To
understand the complexities of the charge and discharge cycles, you need to
be able to watch the processes in situ or to freeze the battery rapidly for
ex situ analysis. Li et al. applied cryo–electron microscopy techniques
commonly used for studying biological samples to examine batteries. They
i... 阅读全帖 |
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l*****9
发帖数: 9501 | 50 http://www.businessweek.com/news/2012-02-27/ovarian-stem-cells-
Ovarian Stem Cells Make Human Eggs in Possible Aid to Fertility
By Ryan Flinn
Feb. 27 (Bloomberg) -- Stem cells taken from human ovaries were used to
produce early-stage eggs by scientists in Boston who may have created a new
method to help infertile women.
Females have a fixed number of eggs from birth that are depleted by the time
of menopause. The finding, published today in the journal Nature Medicine,
challenges the belief that... 阅读全帖 |
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