g*****g
发帖数: 34805 | 1 http://www.networkworld.com/news/tech/2012/102212-nosql-263595.
Here's a good comparison of different NoSQL DBs, obviously there are pros
and cons on different DBs, it all depends on what kind of app you are
writing, write intensive or read intensive. Overall, Cassandra shows great
write performance and read performance with tunable consistency. MongoDB has
great read performance, is closer to SQL DB in the queries, and has better
JSON support.
Personally I feel Cassandra is more flexible but ha... 阅读全帖 |
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g*****g
发帖数: 34805 | 2 Cassandra read is also fast and tunable. The key is the data relation.
It's a hashtable of hashtable and it's best used as a hash table though
relation can be achieved, with labor.
write |
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z****e
发帖数: 54598 | 3 其实我一直在想做一个
nosql到db的一个可tunable的存储工具 |
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g*****g
发帖数: 34805 | 4 Cassandra is tunable consistency. You can achieve atomicity on row level,
for most non-financial usage, it's probably workable. Cassandra is the
preferred datastore for all user data because we are doing active-active in
multiple region. And Cassandra supports multiple DC out of box.
http://techblog.netflix.com/2013/12/active-active-for-multi-reg
ACL. |
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g*****g
发帖数: 34805 | 5 And Cassandra is tunable consistency, Read/Write quorum can achieve strong
consistency and fast read/write.
i.e. Most operations under 10ms regardless of total data size.
. |
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w**z
发帖数: 8232 | 6 It doesn't index the whole SSTable, it has index interval of 128 by default
which is tunable. For reads, it might access more than one SSTables which
can be optimized using Bloomfilter. If you combine the indexes from
different SSTable in the memory, it makes it very complicated. Remember
SSTables can be compacted during compaction. Maintaining a global indices is
not practical. |
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d*********e
发帖数: 3835 | 7 Responsibilities
• Lead reliability work and qualification of wavelength tunable laser
chip and package. • Effectively communicate reliability of complex,
new type of laser chip to customers • Failure Reliability, and
Materials Characterization in Semiconductor Process Development,
Manufacturing, and Reliability Qualification.
• Experience in Semiconductor technology: CMOS, III-V, HEMT, Lasers,
IR Detectors, Power Diodes, AMLCD Skills/Experience:
• Root Cause Analys |
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c**p
发帖数: 36 | 8 Should be AOBS, acoustic optical beam splitter。
AOTF is acoustic optical tunable filter. You can get it everywhere, but
Leica patented AOBS. |
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x********u
发帖数: 430 | 9 I am now trying to switch my PhD project to SynBio area. My current work
focus on creating the best phenotype or genetic background to maximize
carbons flux towards an important intermediate metabolites and ulitmately we
are going to overproduce some natural products. Currently, the volumetric
production of one of our major products has reached 2 g/l.
Although traditional metabolic engineering or metabolic network modeling
holds great promise to engineer better industrially-revelant phenotype, g... 阅读全帖 |
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x********u
发帖数: 430 | 10 I am now trying to switch my PhD project to SynBio area. My current work
focus on creating the best phenotype or genetic background to maximize
carbons flux towards an important intermediate metabolites and ulitmately we
are going to overproduce some natural products. Currently, the volumetric
production of one of our major products has reached 2 g/l.
Although traditional metabolic engineering or metabolic network modeling
holds great promise to engineer better industrially-revelant phenotype, g... 阅读全帖 |
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a********k
发帖数: 2273 | 11 花了一个小时，深深的鄙视一下自己的无聊行径！！
125 蔡亮 男 1980年11月 复旦大学 生命
科学 2007年12月毕业于[美国]北卡大学 [美国]加州大学旧金山分校 博士后
Cai L, Mostov K. Polarity is destiny. Cell. 2009 Nov 13;139(4):660-2. PubMed
PMID: 19914162; PubMed Central PMCID: PMC2900917.
Cai L, Makhov AM, Schafer DA, Bear JE. Coronin 1B antagonizes cortactin and
remodels Arp2/3-containing actin branches in lamellipodia. Cell. 2008 Sep
5;134(5):828-42. PubMed PMID: 18775315; PubMed Central PMCID: PMC2570342.
Cai L, Makhov AM, Bear JE. F-actin... 阅读全帖 |
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l***d
发帖数: 1828 | 12 【 以下文字转载自 Chemistry 讨论区 】
发信人: lrpwd (lrpwd), 信区: Chemistry
标 题: 人民大学39岁化学系主任自杀身亡(转)
发信站: BBS 未名空间站 (Wed Mar 21 09:01:52 2012, 美东)
http://bbs.sciencenet.cn/home.php?mod=space&uid=585031&do=blog&
16日，人民大学化学系主任曹廷炳教授从高楼跳下后身亡。
曹教授是1973年生，属于青年才俊，北大博士毕业后去哈佛跟随某大牛做了3年博士后
，2005年被人大引进。几年来，科研成就不错，2011年11月还在《德国应用化学》这样
的牛刊上发表论文。
据说，曹自杀原因在于压力过大，而且化学系人际关系紧张。跳楼后留下了遗书，妻子
无工作，孩子很小很小。
人间惨剧啊！看来，人大这样的文科学校，校级领导都是文科出身，确实没有孕育理科
的环境，不适合建立理工科院系，或者说短期内人大校领导想出政绩很难！你看，都出
了人命！！！
愿逝者安息！望生者引以为戒！
曹教授教授简介：
http://chem.ruc.edu.c... 阅读全帖 |
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l**********1
发帖数: 5204 | 13 Bingo
人的血红细胞的生物钟韵律调控都可以不用DNA 的 transcription-translation feedback loops
各个血红细胞应该不会只有一套proteomics 不然生物钟韵律调控如何实现?
Nature. 2011 Jan 27;469(7331):498-
Circadian clocks in human red blood cells.
//www.ncbi.nlm.nih.gov/pubmed/21270888
full text link:
//www.dormivigilia.com/wp-content/uploads/2011/02/nature09702.pdf
Abstract
Circadian (～24 hour) clocks are fundamentally important for coordinated physiology in organisms as
diverse
as cyanobacteria and humans. All current models of the molecular circadi... 阅读全帖 |
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m******g
发帖数: 467 | 14 Nature 14.04.17
稍微了解一下：
1. miRNAs trigger widespread epigenetically activated siRNAs from
transposons in Arabidopsis
easiRNA resemble secondary siRNA
latent mechanism that targets tranposon transcripts
小知识：
1. Sperm RNA carries marks of trauma
Stress alters miRNA expression level in mice
which leads to depressive behavior in later generations
stress on mother, F2 generation of F1 males shows disorder
so does F3
2. Dissecting appetite
The hunger circuits has been mapped in mouse
3. Mouse already... 阅读全帖 |
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m********8
发帖数: 314 | 15 求一片文献全文，多谢了。
Biomimetic calcium carbonate concentric microgrooves with tunable widths for
promoting MC3T3-E1 cell functions. Adv Healthc Mater. 2013 Feb;2(2):326-33.
doi: 10.1002/adhm.201200205. Epub 2012 Sep 18. |
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a*****c
发帖数: 53 | 16 Rise to prominence[edit]
Schön's field of research was condensed matter physics and
nanotechnology.[3] He received his Ph.D. from the University of Konstanz in
1997. In late 1997 he was hired by Bell Labs, located in New Jersey, United
States. There, he worked on electronics in which conventional semiconducting
elements (such as silicon) were replaced by crystalline organic materials.
Specific organic materials can conduct electrical currents, and in a so-
called field-effect transistor (a ... 阅读全帖 |
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g****g
发帖数: 8 | 17 Position for
Ph.D graduate student for
• Optical super resolution nanoscopy,
• Micro/nanofluidics,
• Bioimaging
Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanop... 阅读全帖 |
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l****j
发帖数: 35 | 18 有包子重谢! 请发到我的邮箱: l****[email protected]. 谢谢!
1.
Ultrathin cellulose films of tunable nanostructured morphology with a
hydrophobic component.
Nyfors L, Suchy M, Laine J, Kontturi E.
Biomacromolecules. 2009 May 11;10(5):1276-81
2.
Langmuir. 2009 Jul 7;25(13):7675-85
Nanoscale cellulose films with different crystallinities and
mesostructures--their surface properties and interaction with water.
Aulin C, Ahola S, Josefsson P, Nishino T, Hirose Y, Osterberg M,
Wågberg L.
Fibre Technology, Royal Ins |
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c********l
发帖数: 577 | 19 对了,你这个情况可以买300nm UV高反镜.CVI网上有Tunable Laser Line Mirrors,可以
选特定波长的高反. |
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L****r
发帖数: 333 | 21 嘎tech化学 got Younan Xia, in 2011 he publsihed 11 Angewandte Chemie
International Edition.
(1) Silver nanocrystals with concave surfaces and their optical and surface-
enhanced Raman scattering properties
Xia, X.; Zeng, J.; McDearmon, B.; Zheng, Y.; Li, Q. and Xia, Y. Angewandte
Chemie International Edition 2011, 50, 12542-12546 (VIP article, highlighted
on the inside cover).
(2) Shape-controlled synthesis of copper nanocrystals in an aqueous solution
with glucose as a reducing agent and hexadecyl... 阅读全帖 |
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m********8
发帖数: 314 | 22 求一片文献全文，多谢了。
Biomimetic calcium carbonate concentric microgrooves with tunable widths for
promoting MC3T3-E1 cell functions. Adv Healthc Mater. 2013 Feb;2(2):326-33.
doi: 10.1002/adhm.201200205. Epub 2012 Sep 18. |
|
q****i
发帖数: 6923 | 23 http://pubs.acs.org/toc/jpccck/112/10
Polyelectrolyte Controlled Large-Scale Synthesis of Hollow Silica Spheres
with Tunable Sizes and Wall Thicknesses
Yong Wan and Shu-Hong Yu
pp 3641–3647
http://pubs.acs.org/toc/ancac3/4/7
Hollow Silica Nanoparticles in UV−Visible Antireflection Coatings for
Poly(methyl methacrylate) Substrates
Yi Du, Lunet E. Luna, Wui Siew Tan, Michael F. Rubner and Robert E. Cohen
pp 4308–4316 |
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w********o
发帖数: 687 | 25 你是托吧，
点击你的签名 wlphotonics.com
不就是卖这个的，还是你想找竞争对手的网站，去google找啊，输入关键词 |
|
|
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U**********b
发帖数: 13 | 28 【 以下文字转载自 Postdoc 讨论区 】
发信人: UofLlaserlab (UofLlaserlab), 信区: Postdoc
标 题: Post-doc Positions in Molecular Spectroscopy
发信站: BBS 未名空间站 (Mon May 23 14:08:21 2016, 美东)
Two Post-doc Positions in Molecular Spectroscopy at the University of
Louisville and the Ohio State University.
Two post-doctoral positions in experimental and theoretical molecular
spectroscopy are available in the research groups of Prof. Jinjun Liu at the
University of Louisville (UofL) and Prof. Terry A. Miller at the Ohio Stat... 阅读全帖 |
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g****g
发帖数: 8 | 29 Position for
Ph.D graduate student for
• Optical super resolution nanoscopy,
• Micro/nanofluidics,
• Bioimaging
Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanop... 阅读全帖 |
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j******e
发帖数: 50 | 30 Graduate from top 3 university in Canada, published 1st author APL papers
and will submit 1 PRL this month.
如果兄弟们的实验室有OPENING,希望通报一声。
本人有极强的 hands-on and creative skills. 以下是 technical skills.
• Lasers and ultrafast lasers
Expertise with Ti:Sapphire multipass femtosecond amplifier, Ti:Sapphire
regenerative femtosecond amplifier, mode-locked Ti:Sapphire oscillator,
diode lasers, Nd:YAG Q-switched pulse laser, diode pumped solid state (DPSS)
laser, tunable dye laser, excimer lasers, optical |
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c******k
发帖数: 1140 | 31 请见下图 （看不太懂这个图，好像是个measurement setup for spur-free dynamic
range）,TLS: Tunable laser source, MZM:Mach-Zehnder modulator
Flo=25GHz, Fif1=995MHz, Fif2=1005MHz
请问Mach-Zehnder modulator 如何在12.5GHz的RF频率上调制激光信号？光的频率不是
比RF高很多吗？怎么会被调制呢？多谢！！ |
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e*****s
发帖数: 78 | 32 Title: Tunable Work Function in Junctionless Tunnel FETs for Performance
Enhancement
Journal: AJEEE: Australian Journal of Electrical & Electronics Engineering
If you are interested in reviewing the manuscript, please send the following
information to me:
You name, degree, organization, title, email address, and one sentence
introducing your background. Thanks. |
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t***h
发帖数: 1 | 33 I used to use the Fourier Transform Infrared (FTIR) system and the Tunable
Diode Laser (TDL) to measure the NH3 emissions (gas phase) from mobile sources
(vehicles).
http://www.imacc-instruments.com/index.html
this company is selling FTIR system.
Good luck!
exhaust). |
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g****g
发帖数: 8 | 34 Positions for
Ph.D graduate students on
Optical nanoscopy for micro/nanofluidics, cellular imaging and
nanofabrication
Highly motivated applicants with strong experimental background in optics
are invited to apply for two Ph.D graduate student positions for
experimental research. We are developing a novel multifunctional far-field
optical nanoscopic system using two tunable femto lasers for the high
resolution measurement of flow velocity (for research of slip flow and micro
electrokinetic t... 阅读全帖 |
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c*s
发帖数: 2145 | 35 两个有趣的POINTS。
一个是用POLYELECTROLYTE(PE)作为模板， 合成无机那米粒子，
特点在于结合了PE的层3状结构
和其作为NANOREACTOR的特点， 得到WELL-DEFINED 的结构(LAYER BY LAYER) Nano lett.
asap
另一个是MICROGEL，利用他神奇的对热，PH的RESPONSE作文章， 一个是生物方面的运用
，一个是光学方面的应用， 比如形成光子晶体，(latest adv. mater.)
color tunable photonic crystals from soft hydrogel nanoparticles
adv. mater. 14 No.9 pp 658
看来很多人瞄上这个地皮了
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a***n
发帖数: 578 | 36 Self-assembled monolayers as a tunable platform for biosensor applications
Chaki NK, Vijayamohanan K
BIOSENSORS & BIOELECTRONICS
17 (1-2): 1-12 JAN 2002
Abstract:
Considerable attention has been drawn during the last two decades to
functionalize noble metal surfaces by forming ordered organic films of few nm
to several hundred-nm thickness. Self-assembled monolayer (SAM) provides one
simple route to functionalize electrode surfaces by organic molecules (both
aliphatic and aromatic) containing fr |
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m*****e
发帖数: 1506 | 37 沉底的帖子拿出来重温一下。这篇文章最近出现在JACS ASAP。我觉得是未来的一个小
方向。
Free Radical Polymers with Tunable and Selective Bio- and Chemical
Degradability
Jos M. J. Paulusse†, Roey J. Amir†, Richard A. Evans‡ and
Craig J. Hawker*†
http://pubs.acs.org/doi/full/10.1021/ja903245p
defined |
|
发帖数: 1 | 38 Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanophotolithography and measurement. The system will be explored in
multidisciplinary research in biochip and Lab-on-a-Chip devices, cellular
bi... 阅读全帖 |
|
g****g
发帖数: 8 | 39 Position for
Ph.D graduate student for
• Optical super resolution nanoscopy,
• Micro/nanofluidics,
• Bioimaging
Highly motivated applicants with strong experimental background in optics
and bioimagings or micro/nanofluidics are invited to apply for Ph.D student
position for experimental research in Biomedical Engineering. We have
developed a large multifunctional far-field optical nanoscopic system using
two tunable femto lasers for the super resolution imaging,
nanop... 阅读全帖 |
|
w********g
发帖数: 186 | 40 能到440了...
真牛啊...
试试其他激发呗
有条件作个tunable raman玩吧 |
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l*****2
发帖数: 93 | 41 我想找的文献是：
X. Shi, N. M. Pugno and H. Gao, "Tunable Core Size of Carbon Nanoscrolls,"
2010, Journal of Computational and Theoretical Nanoscience, Vol. 7(3), pp.
517-521.
文献下载链接：
我登不上这个杂志的主页，只找到杂志主页是 http://www.aspbs.com/ctn/
请见谅
文献请发至：
l*****[email protected]
附言：
谢谢 |
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g****g
发帖数: 8 | 42 Positions for
Ph.D graduate students on
Optical nanoscopy for micro/nanofluidics, cellular imaging and
nanofabrication
Highly motivated applicants with strong experimental background in optics
are invited to apply for two Ph.D graduate student positions for
experimental research. We are developing a novel multifunctional far-field
optical nanoscopic system using two tunable femto lasers for the high
resolution measurement of flow velocity (for research of slip flow and micro
electrokinetic t... 阅读全帖 |
|
w********o
发帖数: 687 | 43 你是托吧，
点击你的签名 wlphotonics.com
不就是卖这个的，还是你想找竞争对手的网站，去google找啊，输入关键词 |
|
w********o
发帖数: 687 | 44 你是托吧，
点击你的签名 wlphotonics.com
不就是卖这个的，还是你想找竞争对手的网站，去google找啊，输入关键词 |
|
c*****e
发帖数: 44 | 45 小弟最近用一个YAG pulse laser pump一个OPA，但输出光的profile很不均匀（最强最
弱可差10倍），而且功率随时间涨落很大（1s内总功率可变2倍），请问大牛，这通常
是什么原因引起的，有没有什么办法可以解决这个intensity空时变化太大的问题？ |
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w*******e
发帖数: 83 | 46 偶不是大牛，没怎么做过非线性的试验，不过pump得什么晶体啊？是怎么做得opa啊？
估计是没有align好。 |
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b*****n
发帖数: 760 | 47 more details needed....
it is very likely due to the misalignment of the cavity
what is pulse width of YAG?
what is the upstate life time of the crystal? |
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b****r
发帖数: 2555 | 48 First, are you sure of your laser output? Is the laser output itself
stable enough? OPA is based on nonlinear effect, so 10% fluctuation in
laser pulse may lead to 100% fluctuation of your OPA output.
Second, what is your output wavelenth? 1550 nm is always more stable
than 1200 nm output, because of the nonlinear crystal used.
Third, what OPA you are using? OPA from Newport is not as good as
a former soviet union company (EKSPLA or something).
Last, alignment and protection. Even air flow has e |
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c*****e
发帖数: 44 | 49 3X a lot, here are some details.I use 355nm laser from YAG laser as the pump
source, use BBO serve as the OPA nonlinear crystal. Single pulse has a
100ps pulse width.
The 355nm pump laser should has a 15% fluatation as our technichian said.
But how to measure the fluatation of the YAG laser and the OPA? Normally
what kind of powermeter should I use, and how long should I take the average
?
And for the non-uniformity, how to find the cause of the pheonormena? |
|
b****r
发帖数: 2555 | 50 This is pretty standard ps-OPA set-up.
I would suggest you use a pulse energy meter (I am using one from Laser
Probe),
which can give you the average, standard variation, etc., of your pulse
energy. Those are useful information for OPA alignment.
Spatial non-uniformity is mostly due to miss-alignment. I would suggest
you first check your white super-continuum, it should be a co-centered
ring with different colors - and in most case you won't get that (I never
get that), but you should do the bes |
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