d****n
发帖数: 397 | 1 【 以下文字转载自 Physics 讨论区 】
发信人: dragon (dragon), 信区: Physics
标 题: gas phase nucleation问题求教
发信站: BBS 未名空间站 (Sat Mar 16 00:45:57 2013, 美东)
版上大牛，
我有个问题。就是gas phase nucleation.我们都知道pure water在0度以下，-40度
以上是不会结冰的。这是因为要形成冰核，必需翻越一个能垒。这个能垒联接了过冷水
（metastable state)和冰(stable state).同样也有过热蒸汽。当一个gas phase
species的浓度大于它的饱和蒸汽压的时候，它也不会形成droplet。所以nucleation(
形成droplet的过程),也是有个能垒。这个能垒和nucleation 速率有关，就是物理化学
（化学物理）里面的transition state theory.这个nucleation rate很早就已经有人
研究，Gibbs就提出classical nucleation theory.这个理论后来被发... 阅读全帖 |
|
d****n
发帖数: 397 | 2 版上大牛，
我有个问题。就是gas phase nucleation.我们都知道pure water在0度以下，-40度
以上是不会结冰的。这是因为要形成冰核，必需翻越一个能垒。这个能垒联接了过冷水
（metastable state)和冰(stable state).同样也有过热蒸汽。当一个gas phase
species的浓度大于它的饱和蒸汽压的时候，它也不会形成droplet。所以nucleation(
形成droplet的过程),也是有个能垒。这个能垒和nucleation 速率有关，就是物理化学
（化学物理）里面的transition state theory.这个nucleation rate很早就已经有人
研究，Gibbs就提出classical nucleation theory.这个理论后来被发展到
multicomponent很复杂的公式。但是这个理论有个不好的地方是（1）它要surface
tension.这是一个宏观量，当droplet很小的时候不一定准。（2）当supersaturation
接近spinodal decomposition的时候，能垒... 阅读全帖 |
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y*****o
发帖数: 2364 | 3 April 3, 2016
USCIS
Attn: I-140
2501 S. State Highway 121 Business
Suite 400
Lewisville, TX 75067
RE: EB-1 Petition for Permanent Residency under the category of Alien of
Extraordinary Ability
Petitioner/Beneficiary: XXX YANG, Ph.D.
Classification Sought: 203(b)(1)(A)
Type of Petition: I-140
Dear Immigration Officer:
This letter is respectfully submitted in support of Dr. XXX Yang’s petition
for classification as a qualified immigrant under the first p... 阅读全帖 |
|
a*****e
发帖数: 182 | 4
我想不是homogeneous nucleation 使crystallization温度降低, 而是只有当温度足够低
时能有homogeneous nucleation induced crystallization发生. Super-cooling较小时
一般都是heterogeneous nucleation.
Refer to: Eur. Phys. J. E 12, 111-117(2003) |
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w*********r
发帖数: 42116 | 5 PM2.5 particles are air pollutants with a diameter of 2.5 micrometers or
less. 包括固体颗粒和液体颗粒。和雾霾没有关系，雾霾是衡量可见度的。如果都是液
体是雾，有固体颗粒了，就是霾.
PM2.5突然高于平均情况，要看颗粒的成分，才能知道污染如何加重的。如果没有新的
污染源，PM2.5增大，只能说明更小的颗粒达到了被测量到的SIZE。
可能是heterogeneous nucleation，固体颗粒表面反应，吸附了水分或者其它液态气态
物质变成大颗粒，重颗粒。也可能homogeneous nucleation，液态或气态同一种物质，
因为浓度的提高或者温度的变化，稳定成核的SIZE变大，原来更小的颗粒变成大于2.5
的颗粒。 |
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f***y
发帖数: 4447 | 6 http://news.sina.com.cn/o/2017-11-10/doc-ifynrsrf3416067.shtml
11月10日，美国Science杂志以First Release的形式发表了西安交通大学与上海微系统
与信息技术研究所的合作论文——Reducing the stochasticity of crystal
nucleation to enable sub-nanosecond memory writing（降低晶体成核随机性以实现
亚纳秒数据存储），该工作从接收到在线发表仅10天。
处于数字全球化的今天，爆炸式增长的信息对数据的存储与传输提出了极大的挑战，而
且目前商用计算体系架构内各存储部件，即缓存（SRAM）、内存（DRAM）和闪存（NAND
Flash）之间性能差距日益加大，其间的数据交换效率也已成为了电子设备发展的瓶颈
。因此研发具备存储密度大、读写速度快、能耗低、非易失（即断电后数据不丢失）等
特点的新式通用式存储介质势在必行。基于相变材料的相变存储器（PCRAM）是最接近
商业化的通用式存储器，由国际半导体巨头Intel与Mircon联合推出的首款... 阅读全帖 |
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发帖数: 1 | 7 【 以下文字转载自 ME 讨论区 】
发信人: beats (beats), 信区: ME
标 题: Harvard professor John W. Hutchinson is accused of plagiarism
发信站: BBS 未名空间站 (Mon Sep 12 16:12:16 2016, 美东)
from: Liang Xue
to: John Hutchinson
cc: Tomasz Wierzbicki
date: Mon, Aug 11, 2014 at 12:12 PM
subject: Re: No winners--follow-up
Dear John,
Thank you for your email. I had a difficult time to understand the
message you want sent. My guess is that the central message you would like
to emphasize is that you can develop the sa... 阅读全帖 |
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l*****y
发帖数: 5737 | 8 ☆─────────────────────────────────────☆
jck (浮萍妈妈) 于 (Wed Feb 20 13:59:02 2008) 提到:
我父亲在被诊断为Myelodysplastic syndrome。现在正在用Amifostine，也考虑用
vidaza。看了网上文章，Amifostine好象还实验阶段。我们对Amifostine的疗效怀疑。
我父身体很弱，反应很大。我想把他的骨髓细胞检验报告翻译到英文好在美找专家问问
。可是我用了好几个小时才翻了几个字，还不确定。请各位能者帮着翻一下，哪怕一个
词也好。谢谢了！
原始粒细胞 15 0-1.0
早幼粒细胞 2 0-2.5
中性中幼粒细胞 18.5 3.2-13.5
中性晚幼粒细胞 17 5.0-20.0
中性杆状核粒细胞 21 8.5-25.0
中性分叶核粒细胞 5 6.1-20.0
嗜酸性中幼幼粒细胞 0-1.1
嗜酸性晚幼粒细胞... 阅读全帖 |
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r****r
发帖数: 14 | 9 Run a DSC with different cooling rate. You'll find the different onset
crystallization temperature. fast cooling leads to lower onset Tc. To controll
the onset Tc, you can try to find some nucleating agent to lower the
nucleation barrier (to decresase the surface free energy). I am not familar
with nylon, but as I know, some hydogen bonding will be formed inside the
crystal. So adding some additive that can affect the hydrogen bonding may have
chance to controll the kinetics thus the onset Tc.
|
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z**h
发帖数: 224 | 10 we are trying to explain this physically. If you plot the free energy vs
compositon , you get two minimums.The nucleation and spinodal lies between
the two minimums. when the second derivative of free energy is negative , the
spinodal happens. My question was for nucleation or spinodal, we finally got
A-rich phase and B-rich phase. The initial composition lies between this two.
So if A from initial mixture goes to A-rich phase we have negative diffusion.
If A from initial mixturre goes to B-rich |
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c*******n
发帖数: 1648 | 11 Actually what I was talking about is a physical picture in people's mind
When spinodal happens, the tiny amplitude of composition fluctuation wave
exists initally, the composition fluctuation is getting bigger and bigger
with the time. The concentration gradient is getting bigger and bigger as the
result. That's exactly what negative diffusion coeff. means!
When nucleation happens, following your way, let's say tiny amount of
B nucleat into almost 100% pure particles. As this particle grows into |
|
发帖数: 1 | 12 from: Liang Xue
to: John Hutchinson
cc: Tomasz Wierzbicki
date: Mon, Aug 11, 2014 at 12:12 PM
subject: Re: No winners--follow-up
Dear John,
Thank you for your email. I had a difficult time to understand the
message you want sent. My guess is that the central message you would like
to emphasize is that you can develop the same model once you understood that
ductile fracture is indeed J3 dependent. Possibly. I
believe many people have the necessary knowledge to do so on their
own. H... 阅读全帖 |
|
t*****a
发帖数: 5180 | 13 【 以下文字转载自 Faculty 讨论区 】
发信人: haolin (我想QJ社会，却被社会整YW了), 信区: Faculty
标 题: 美国终身教授的海归全记录（二）
发信站: BBS 未名空间站 (Sun Aug 27 02:41:22 2017, 美东)
事业与家庭，前途与发展，环境和空气......到底是留在海外，还是回国发展？让我们
共同领略一位美国终身教授的心路历程（二）。前半篇文章请关注今日头条内容。
南科大湖畔的书院
第八回
大学与书院
“这是最好的时代，这是最坏的时代；这是智慧的时代，这是愚蠢的时代；这
是信仰的时期，这是怀疑的时期。。。”《双城记》开场白的经典在于它捕捉的两面性
在任何迅速发展变革的时期都适用。它可以来描述法国大革命，可以形容互联网时代，
甚至可以概括大学生涯。而互联网时代的大学生涯更是良机和危机共同四伏的时期。互
联网给高等教育带来诸多便利的同时也带来变革的压力，但我从不担心在线教育会取代
真正的大学，因为大学远远不是录播一些公开课视频那么简单。大学（以及党校和商学
院）最大的附加值是使人有机会和一群有才华有梦想的同龄人用人... 阅读全帖 |
|
j***h
发帖数: 4412 | 14 Earthquake detection systems can sound the alarm in the moments before a
big tremor strikes—time enough to save lives
Japan’s system, which went live in 2007, makes heavy use of personal
technology. Alerts go out not only on television and radio but through
special receivers in homes, offices and schools. Pop-up windows on
computers show a real-time map with the epicenter’s location and the
radiating seismic waves. A timer counts down to the shaking at your
location and highlights predicted inte... 阅读全帖 |
|
g***j
发帖数: 40861 | 15 【 以下文字转载自 Biology 讨论区 】
发信人: supersunday (Linda), 信区: Biology
标 题: 美国终身教授的海归全记录（二） (转载)
发信站: BBS 未名空间站 (Tue Aug 29 13:45:16 2017, 美东)
发信人: haolin (我想QJ社会，却被社会整YW了), 信区: Faculty
标 题: 美国终身教授的海归全记录（二）
发信站: BBS 未名空间站 (Sun Aug 27 02:41:22 2017, 美东)
事业与家庭，前途与发展，环境和空气......到底是留在海外，还是回国发展？让我们
共同领略一位美国终身教授的心路历程（二）。前半篇文章请关注今日头条内容。
南科大湖畔的书院
第八回
大学与书院
“这是最好的时代，这是最坏的时代；这是智慧的时代，这是愚蠢的时代；这
是信仰的时期，这是怀疑的时期。。。”《双城记》开场白的经典在于它捕捉的两面性
在任何迅速发展变革的时期都适用。它可以来描述法国大革命，可以形容互联网时代，
甚至可以概括大学生涯。而互联网时代的大学生涯更是良机和危机共同四伏的时... 阅读全帖 |
|
t*****a
发帖数: 5180 | 16 【 以下文字转载自 History 讨论区 】
发信人: takaoka (高岡同志), 信区: History
标 题: 美国终身教授的海归全记录（二） (转载)
发信站: BBS 未名空间站 (Tue Aug 29 00:01:31 2017, 美东)
发信人: haolin (我想QJ社会，却被社会整YW了), 信区: Faculty
标 题: 美国终身教授的海归全记录（二）
发信站: BBS 未名空间站 (Sun Aug 27 02:41:22 2017, 美东)
事业与家庭，前途与发展，环境和空气......到底是留在海外，还是回国发展？让我们
共同领略一位美国终身教授的心路历程（二）。前半篇文章请关注今日头条内容。
南科大湖畔的书院
第八回
大学与书院
“这是最好的时代，这是最坏的时代；这是智慧的时代，这是愚蠢的时代；这
是信仰的时期，这是怀疑的时期。。。”《双城记》开场白的经典在于它捕捉的两面性
在任何迅速发展变革的时期都适用。它可以来描述法国大革命，可以形容互联网时代，
甚至可以概括大学生涯。而互联网时代的大学生涯更是良机和危机共同四伏的时期。互
联... 阅读全帖 |
|
发帖数: 1 | 17 科學家發現 恆星爆炸會影響地球天氣
雖然太空中的恆星距離地球很遠，但它們有可能透過宇宙射線影響地球。丹麥科學家最
近就發現，恆星在臨終前爆炸所生成的超新星，會散發離子進入地球的大氣層，進而影
響地球的天氣。
據英國《每日電訊報》報導，在這項由丹麥科技大學（Technical University of
Denmark）所進行的研究中，研究人員在實驗室中模擬宇宙射線對大氣層的影響，並進
行長達兩年的觀察。
結果發現，恆星爆炸發出的高能量粒子會去掉空氣分子的電子，使其成為帶正電或負電
的離子。
這些帶電粒子會吸附水分和硫酸，形成不會蒸發的小團塊，此一過程稱為成核現象（
nucleation）。隨著這些小團塊的增長，它們會吸附更多水分，當它們足夠大時，就會
形成雲朵。
如果雲量較多，氣候就比較涼爽，從而對長期氣候造成重大影響。
這項研究也顯示，太陽的活動會影響進入地球的宇宙射線。當太陽處於安靜期，就像現
在，較多的宇宙射線會進入地球大氣層，使地球降溫。
而在太陽活躍期，它的電磁輻射會阻止很多宇宙射線抵達地球，致使地球大氣層的雲量
較少，所以氣候會較溫暖。
研究人... 阅读全帖 |
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w********h
发帖数: 12367 | 18 http://cenblog.org/the-editors-blog/2010/10/it%E2%80%99s-not-the-money-stupid/
It's Not The Money, Stupid!
This guest editorial is by Allen J. Bard, a chemistry professor and director
of the Center for Electrochemistry at the University of Texas, Austin.
The culture of academic research has shifted over the past 50 years from
research evaluation based on teaching, creativity, and productivity to one
based simply on the amount of money (often now called “resources”) raised.
A number of factors ha... 阅读全帖 |
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发帖数: 1 | 19 既然有人来替哈抄抄洗地，那我就得批评你了。
你第一句就错了。Gurson的yield function如果只是Gurson那时的压力相关的椭球的话
，并不能取得后来的成功。这个模型的成功在于后来的加上nucleation的改进，这样屈
服面椭球的大小就和空洞大小更有关系。这也导致了它最开始成功预测剪切带的形成。
这个是80年代初的事情了。学术界普遍认为的这个改进已经能应用在剪切模式了。你查
查过去几十年的文献就知道这个模型应用在预报剪切断裂，比如blanking等的不知道有
多少。
第二，J3和Lode角在本构里的应用当然不少。但其对于金属断裂中剪切带的形成和断裂
模态的变化，我之前并未见过这样的文章。如果你比我更了解，可以贴出来我也学习一
下。贴不出来的话，那我就认为你在说大话了。
第三，宗师不宗师，这种话不要瞎讲。指导哈抄抄，这事我干过。指导宗师，这事我没
干过，以后也不会干。
第四，你觉得哈抄抄得有这个insight。你的觉得当然是错了。哈抄抄自己自己都承认
他一开始以为没这个J3 dependence，也承认模型是我先改的。你好好读读哈抄抄的道
歉信再来说话。
补充一句，你说两... 阅读全帖 |
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l*****r
发帖数: 990 | 20 首先，Gurson model 不能很好模拟剪切模式，加不加nucleation都一样，这是老夫20
年前就有的理解，并不是从你那里学来的。
用 I1–J2–J3 来描述压力相关的金属剪切带很早就有，你并不是第一个。我觉得这个
insight真的很一般，我大约20年前就知道。举几个比你早10年金属剪切带的例子：
Lee YK and Gosh J. (1999). THE SIGNIFICANCE OF J3 TO THE PREDICTION OF SHEAR
BANDS, International Journal of Plasticity, Vol. 12, No. 9, pp. 1179-1197.
Brunig (1999, 2001) and Brunig et al. (2000) have studied numerically the
effect of hydrostatic stress sensitivity on shear-band development in iron-
based high-strength metals, using general... 阅读全帖 |
|
h****n
发帖数: 107 | 21 事业与家庭，前途与发展，环境和空气......到底是留在海外，还是回国发展？让我们
共同领略一位美国终身教授的心路历程（二）。前半篇文章请关注今日头条内容。
南科大湖畔的书院
第八回
大学与书院
“这是最好的时代，这是最坏的时代；这是智慧的时代，这是愚蠢的时代；这
是信仰的时期，这是怀疑的时期。。。”《双城记》开场白的经典在于它捕捉的两面性
在任何迅速发展变革的时期都适用。它可以来描述法国大革命，可以形容互联网时代，
甚至可以概括大学生涯。而互联网时代的大学生涯更是良机和危机共同四伏的时期。互
联网给高等教育带来诸多便利的同时也带来变革的压力，但我从不担心在线教育会取代
真正的大学，因为大学远远不是录播一些公开课视频那么简单。大学（以及党校和商学
院）最大的附加值是使人有机会和一群有才华有梦想的同龄人用人生中信仰与怀疑并存
的几年去建立深度联系。也有父母把选择大学上升到给孩子选dating pool（找对象的
池子）的高度。这两种想法本质是一致的：我们看中的不是大学的围墙和建筑，而是大
学里的同伴和老师。
不论一个人的朋友圈名单有多长，普通人能够维持的真... 阅读全帖 |
|
b***b
发帖数: 13249 | 22 Labs：
Urinalysis(June 20): calcium oxalate crystals ++ in the urine. No other
abnormality. CBC, stool test, liver function, renal function, electrolytes (
June 20, 2012) are all within normal limits.
Bone metabolic index: osteocalcin 26.04ng/ml
Pleural fluid analysis: Pleural albumin--2.9mg/dl. Total pleural protein: 4.
7mg/dl.Chloride 108 mmol/L. Glucose: 5.3mmol/L.
Rivalta test： positive +++. Color: sanguinous. lymphocyte: 87%. Total
nucleated cell count: 6560.0 (X10^6/L). Acid-fast bacilli w... 阅读全帖 |
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g**********f
发帖数: 68 | 23 The position is open for a motivated post doctoral candidate to study
oilfield scale control of mineral salt (carbonates, sulfates or sulfides)
nucleation, precipitation and inhibition in the oil and gas operations http://www.brinechem.rice.edu/. The ideal candidate should be versed in the aquatic and geochemistry and have experimental experiences in thermodynamics, kinetics and surface chemistry, self-motivated and genuinely interested in academic and industrial research. The candidate shall ... 阅读全帖 |
|
g**********f
发帖数: 68 | 24 The position is open for a motivated post doctoral candidate to study
oilfield scale control of mineral salt (carbonates, sulfates or sulfides)
nucleation, precipitation and inhibition in the oil and gas operations http://www.brinechem.rice.edu/. The ideal candidate should be versed in the aquatic and geochemistry and have experimental experiences in thermodynamics, kinetics and surface chemistry, self-motivated and genuinely interested in academic and industrial research. The candidate shall ... 阅读全帖 |
|
f******I
发帖数: 769 | 25
platelet count lower than 150 thousands is low,
nucleated RBC means those RBCs are premature red cells spilled into
circulation from bone marrow, either the overall system is understress such
as acute bleeding or sepsis, or there is something wrong with bone marrow
regulating system, |
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a*p
发帖数: 3 | 26 Sorry no chinese input.
We used CBR to store our newborn's cord blood. However when
I got the certificate it said that the total volume received
is only 35cc and total nucleated cell count is 120 million.
I read from other website that average volume is 103cc and
cell count 890 million. To treat diseases you need 30 million
cells per kg of body weight. That means our collection is
only good for 4 kg body. BTW public banks has a minimum requirement
of 60cc and 600 million cells. I really don' |
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l****y
发帖数: 44 | 27 What's your "volume received" and "total nucleated cells"？
有没有delay cord clamping 同时存脐带血的？ |
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b**m
发帖数: 91 | 28 Applications are invited for a postdoctoral position in Professor Guangwen
Zhou’s group at the Department of Mechanical Engineering, State University
of New York (SUNY), Binghamton. The appointment is initially for a duration
of one year, annually renewable up to three years. The project addresses the
atomistic mechanism of metal oxidation from oxygen surface chemisorption to
oxide nucleation and growth using variable-temperature ultrahigh vacuum (
UHV) scanning tunneling microscopy (STM) techni |
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b****u
发帖数: 39 | 29 Postdoctoral Position in Aquatic, Electrolytic or Geochemistry
The position is open for a motivated post doctoral candidate to study
oilfield scale control of carbonate, sulfate or sulfide type mineral salt
nucleation, precipitation and inhibition. The candidate may also be
involved in research related to the long-term impact of CO2 injection to
geologic formation for CO2 storage and application of nanotechnology in the
oil and gas operations http://brinechem.rice.edu/. The ideal candidate sh |
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VA
发帖数: 62 | 30 Postdoctoral Position in Aquatic or Geochemistry
The position is open for a motivated post doctoral candidate to study
oilfield scale control of carbonate, sulfate or sulfide type mineral salt
nucleation, precipitation and inhibition. The candidate may also be
involved in research related to the long-term impact of CO2 injection to
geologic formation for CO2 storage and application of nanotechnology in the
oil and gas operations http://brinechem.rice.edu/. The ideal candidate should be versed |
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VA
发帖数: 62 | 31 发过一次了，
版主没有给mark起来。
再发一次好了。
Postdoctoral Position in Aquatic or Geochemistry
The position is open for a motivated post doctoral candidate to study
oilfield scale control of carbonate, sulfate or sulfide type mineral salt
nucleation, precipitation and inhibition. The candidate may also be
involved in research related to the long-term impact of CO2 injection to
geologic formation for CO2 storage and application of nanotechnology in the
oil and gas operations http://brinechem.rice.edu/. The idea |
|
VA
发帖数: 62 | 32 现在组里的钱挺多的，急需再招一两个博士后干活。
Postdoctoral Position in Aquatic or Geochemistry
The position is open for a motivated post doctoral candidate to study
oilfield scale control of carbonate, sulfate or sulfide type mineral salt
nucleation, precipitation and inhibition. The candidate may also be
involved in research related to the long-term impact of CO2 injection to
geologic formation for CO2 storage and application of nanotechnology in the
oil and gas operations http://brinechem.rice.edu/. The ideal ca... 阅读全帖 |
|
VA
发帖数: 62 | 33 以前发过两三次类似的招postdoc的帖子，
很快就招到人了。
现在组里又有position available了，
所以继续再发。
Postdoctoral Position in Aquatic, Electrolytic or Geochemistry
The position is open for a motivated post doctoral candidate to study
oilfield scale control of carbonate, sulfate or sulfide type mineral salt
nucleation, precipitation and inhibition. The candidate may also be
involved in research related to the long-term impact of CO2 injection to
geologic formation for CO2 storage and application of nanotechnology in the
oil and ... 阅读全帖 |
|
VA
发帖数: 62 | 34 Postdoctoral Position in Aquatic or Geochemistry
The position is open for a motivated post doctoral candidate to study
oilfield scale control of mineral salt (carbonates, sulfates or sulfides)
nucleation, precipitation and inhibition. The candidate may also be
involved in research related to the long-term impact of CO2 injection to
geologic formation for CO2 storage in the oil and gas operations http://brinechem.rice.edu/. The ideal candidate should be versed in the aquatic and geochemistry a... 阅读全帖 |
|
VA
发帖数: 62 | 35 我们组有个consortium， 每年20多个member交钱给做research，一年固定的funding有
50 万左右。最近和别的group申请到CO2 sequestration的项目，一年又有20万的进账
。组里主要靠博士后干活，所以一直再招人。
Postdoctoral Position in Aquatic or Geochemistry
The position is open for a motivated post doctoral candidate to study
oilfield scale control of mineral salt (carbonates, sulfates or sulfides)
nucleation, precipitation and inhibition. The candidate may also be
involved in research related to the long-term impact of CO2 injection to
geologic formation for CO2 storage i... 阅读全帖 |
|
i*******u
发帖数: 89 | 36 Postdoctoral Position in Aquatic or Geochemistry
The position is open for a motivated post doctoral candidate to study
oilfield scale control of mineral salt (carbonates, sulfates or sulfides)
nucleation, precipitation and inhibition. The candidate may also be
involved in research related to the long-term impact of CO2 injection to
geologic formation for CO2 storage in the oil and gas operations http://brinechem.rice.edu/. The ideal candidate should be versed in the aquatic and geochemistry a... 阅读全帖 |
|
g**********f
发帖数: 68 | 37 The position is open for a motivated post doctoral candidate to study
oilfield scale control of mineral salt (carbonates, sulfates or sulfides)
nucleation, precipitation and inhibition in the oil and gas operations http://www.brinechem.rice.edu/. The ideal candidate should be versed in the aquatic and geochemistry and have experimental experiences in thermodynamics, kinetics and surface chemistry, self-motivated and genuinely interested in academic and industrial research. The candidate shall ... 阅读全帖 |
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g**********f
发帖数: 68 | 38 The position is open for a motivated post doctoral candidate to study
oilfield scale control of mineral salt (carbonates, sulfates or sulfides)
nucleation, precipitation and inhibition in the oil and gas operations http://www.brinechem.rice.edu/. The ideal candidate should be versed in the aquatic and geochemistry and have experimental experiences in thermodynamics, kinetics and surface chemistry, self-motivated and genuinely interested in academic and industrial research. The candidate shall ... 阅读全帖 |
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j******l
发帖数: 2790 | 39 美国终身教授的海归全记录（二）
原创 2017-08-24 巍巍一笑 知社学术圈
海归学者发起的公益学术平台
分享信息，整合资源
交流学术，偶尔风月
事业与家庭，前途与发展，环境和空气......到底是留在海外，还是回国发展？让我们
共同领略一位美国终身教授的心路历程（二）。前半篇文章请关注今日头条内容。
南科大湖畔的书院
第八回
大学与书院
“这是最好的时代，这是最坏的时代；这是智慧的时代，这是愚蠢的时代；这
是信仰的时期，这是怀疑的时期。。。”《双城记》开场白的经典在于它捕捉的两面性
在任何迅速发展变革的时期都适用。它可以来描述法国大革命，可以形容互联网时代，
甚至可以概括大学生涯。而互联网时代的大学生涯更是良机和危机共同四伏的时期。互
联网给高等教育带来诸多便利的同时也带来变革的压力，但我从不担心在线教育会取代
真正的大学，因为大学远远不是录播一些公开课视频那么简单。大学（以及党校和商学
院）最大的附加值是使人有机会和一群有才华有梦想的同龄人用人生中信仰与怀疑并存
的几年去建立深度联系。也有父母把选择大学上升到给孩子选dating pool（找对象的
池子）的高度... 阅读全帖 |
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e********6
发帖数: 14 | 40 本人本科，phd均为材料方向，目前已参加工作——公司不管绿卡，也没有什么捷径，
所以只好靠自己积累和折腾啦~~
现有journal文章7篇，杂志1篇，还有1-2篇journal在投。打算申请eb1a，但严重缺审
稿经验，所以在此跪求审稿机会.
方向：因为多年来做过各种项目，材料学相关的我多少都懂一些；具体方向(按重要程
度递减):（1) magnetic materials, magnetic recording, (2)metals and alloys,
including microstructure, mechanical properties, nucleation theory, crystal
growth, heat transfer, thermal modeling, (3) electronic materials,
composites, solders, electronic packaging, (4)nanomaterials, pizeoceramics,
chemical synthesis
站内联系，万分感谢并找机会报答！ :) |
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s*****6
发帖数: 2379 | 41 ECS 系列近两年发行的 Journal， 2013 IF 0.9
Keywords: Cu CVD, nucleation, ULSI
如果感兴趣，请把你的详细联系方式（必需是学校或研究机关的）和简短的个人研究方
向发给我。
站内信箱联系。
最好是有一些相关经验，差太远我也不好推荐。谢谢。 |
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f**2
发帖数: 340 | 42 Chem Commun
关键词 Crystallisation， Graphite Surfaces, nucleation and growth
请需要的同学站内信联系，请注明姓名 工作单位 联系邮箱。并附上以第三人称写的一
小段英文研究经历介绍，方便推荐时发给编辑.
三天内有效 |
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j***h
发帖数: 4412 | 43 Earthquake detection systems can sound the alarm in the moments before a
big tremor strikes—time enough to save lives
Japan’s system, which went live in 2007, makes heavy use of personal
technology. Alerts go out not only on television and radio but through
special receivers in homes, offices and schools. Pop-up windows on
computers show a real-time map with the epicenter’s location and the
radiating seismic waves. A timer counts down to the shaking at your
location and highlights predicted inte... 阅读全帖 |
|
j***h
发帖数: 4412 | 44 Earthquake detection systems can sound the alarm in the moments before a
big tremor strikes—time enough to save lives
Japan’s system, which went live in 2007, makes heavy use of personal
technology. Alerts go out not only on television and radio but through
special receivers in homes, offices and schools. Pop-up windows on
computers show a real-time map with the epicenter’s location and the
radiating seismic waves. A timer counts down to the shaking at your
location and highlights predicted inte... 阅读全帖 |
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b*******s
发帖数: 954 | 45 Actually genes change all the time :P
Two examples:
(1) DNA mutates and is repaired in the body all the time.
http://www.ncbi.nlm.nih.gov/books/NBK7566/
"Instability of the human genome: mutation and DNA repair"
A couple quotes from this chapter:
"New mutations arise in single individuals, in somatic cells or in the
germline."
"DNA is also subject to significant spontaneous chemical attack in the
cell. For example, every day approximately 5000 adenines or guanines are
lost from the DNA of each n... 阅读全帖 |
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j****u
发帖数: 1413 | 46 新闻与照片请见：http://www.ustcif.org/default.php/content/1144/
UIUC新科教授张杨教授主页 http://zhang.npre.illinois.edu/
说明：张杨博士2012年9月出任美国伊利诺伊大学核能、粒子与放射工程系助理教授。
2011年8月1日，美国麻省理工学院（MIT）网站头条刊登《揭开水之奥秘》的新闻，以
此祝贺中国科学技术大学校友张杨（MIT2010届博士）揭示生命之源水特性的重要成就
。张杨博士的实验验证了水在有限空间的临界现象理论，该成果有可能对生物，化工，
土木工程等产生重要影响。
张杨在MIT博士毕业答辩时留影，其身后是核燃料棒组件。
水是生命之源——人们喝水、在水中游泳；人体大部由水组成。水无所不在，但是水的
许多科学问题却依然困扰着人们。例如，大部分物质遇冷收缩，唯独水在结冰时反而膨
胀，所以冰浮于水面。然而，人们对这个自然现象的根本原因的了解却依然非常有限。
张杨及其导师，MIT教授陈守信共同揭开水的部分神秘特性，并在《美国科学院院刊》
（Proceedings of the National Acade... 阅读全帖 |
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g*********d
发帖数: 233 | 47 The role of small non-coding RNAs in genome stability and chromatin
organization
http://jcs.biologists.org/content/123/11/1825.full
Josien C. van Wolfswinkel and René F. Ketting*
Journal of Cell Science 123, 1825-1839
© 2010. Published by The Company of Biologists Ltd
doi:10.1242/jcs.061713
Summary
Small non-coding RNAs make up much of the RNA content of a cell and have
the potential to regulate gene expression on many different levels.
Initial discoveries in the 1990s and early 21st centur... 阅读全帖 |
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l**********1
发帖数: 5204 | 48 Bingo
it was from
更新时间： 2001-June-12
在美国当教授的北大毕业生(部分)
//www.gotopku.cn/data/detail.php?id=1974
----
Recent 2007 database please try:
[八卦江湖] 带大家认识一下顶尖的美国华裔/华侨女科学家们（有PP有真相）
作者：第五哇 发表日期：2010-8-19
//www.tianya.cn/publicforum/content/funinfo/1/2195431.shtml
---
only HHMI PI please go to
//bbs.netbig.com/thread-2113463-1-1.html
发表于 2011-11-18
NB: updated 2012-May-13
著名医学研究HHMI华裔/华侨PI科学家汇总
华裔/华侨 医学研究 HHMI, 科学家, 著名
Howard Hughes Medical Institute （HHMI） 是全球规模最大的非盈利性私立医学研
究所-基金会，拥资120忆，为美国第二大的慈善机构，仅次... 阅读全帖 |
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K**4
发帖数: 1015 | 49 这个文章提出的DNA-guidedDNAinterference by bacterial Argonaute (or PIWI) 好
像不是很充分阿。首先他自己的实验也表明，Argonaute即结合RNA也结合DNA。
Analysis of co-purifiednucleicacidsrevealedthatTtAgo-associatedRNA (10–150
nucleotides) is preferentially 32 P-labelled in a polynucleotide kinase (PNK
) forward reaction, indicating the presence of 5' hydroxyl groups (Extended
Data Fig. 1c). By contrast, co-purified DNA has a more defined length (13–
25 nucleotides), and is preferentially labelled in a PNKexchangereaction,
indicatingph... 阅读全帖 |
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s*******e
发帖数: 1389 | 50 hepatocytes有tetraploid (binucleated 2 x 2n or mononucleated 4n) and
octoploid (binucleated 2 x 4n or mono- nucleated 8n) |
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