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全部话题 - 话题: dispersion
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b********e
发帖数: 1100
1
Note: This article was originally published in 2003. It has been edited and
updated for current use.
In 2003, several students visited the Office of International Student and
Scholar Services and inquired whether there are any immigration consequences
to protesting the current Iraq war. Anyone in the United States, be they U.
S. citizens or foreign nationals, have rights under the U.S. Constitution.
This includes the right to free speech and freedom of assembly. However,
given the current restri... 阅读全帖
g**1
发帖数: 10330
2
http://www.usatoday.com/story/news/nation/2013/11/25/pentagon-c
Pentagon builds forces in Pacific, eyes China
Tom Vanden Brook, USA TODAY 6:25 p.m. EST November 25, 2013
Tinian
(Photo: None)
WASHINGTON — The Pentagon is fortifying bases in the Pacific and looking to
revive World War II-era air bases as part of an effort to survive a Chinese
missile attack that could wipe out critical installations on Okinawa and
elsewhere, military records, interviews and congressional testimony show.
The strate... 阅读全帖
l*****7
发帖数: 8463
3
来自主题: Military版 - 催泪法戒烟
菲尔个森人民很悲愤呀!
用催泪法戒烟。
http://www.aol.com/article/2014/08/17/police-deploy-tear-gas-to
Police deploy tear gas to impose Ferguson curfew
Aug 17th 2014 6:01AM2488 Comments
⟨⟩
FERGUSON, MO - AUGUST 17: People wait for reaction from police after they
refused to honor the midnight curfew on August 17, 2014 in Ferguson,
Missouri. The curfew was imposed on Saturday in an attempt to reign in the
violence that has erupted nearly every night in the suburban St. Louis town
since the shooting dea... 阅读全帖
c****g
发帖数: 37081
4
来自主题: Military版 - 夏洛特暴乱1死
CHARLOTTE, N.C. (Reuters) - One person was shot dead on Wednesday in a
second night of unrest in Charlotte, North Carolina, officials said, as
police in riot gear fired tear gas and rubber bullets to disperse a
demonstration against the fatal police shooting of a black man who officers
said had refused their orders to drop a handgun.
Charlotte Police Chief Kerr Putney confirmed the fatality, but he did not
identify the person nor did he say whether they were participating in the
protests.
The la... 阅读全帖
F*****y
发帖数: 3877
5
你11-12年来的ufl,研究金属离子键光谱相关的,你觉着我把你的反美言论发到下面
这些人,他们能不能记起来你是哪位?
Jason E. Butler
Professor 352-392-2591
[email protected]/* */ Dynamics of Complex Fluids, Suspension and Multiphase
Fluid Mechanics, Polymer Dynamics and Rheology
Anuj Chauhan
Professor 352-392-2592
[email protected]/* */ Microfluidics, Drug Delivery, Biomaterials, Complex
Fluids
Oscar D. Crisalle
Professor 352-392-5120
[email protected]/* */ Process Control Engineering, Manufacture and
Optimization o... 阅读全帖
n*******s
发帖数: 216
6
来自主题: Military2版 - 国内的军事新闻真是越看越吓人
"刹车液就是液压传动用的,能有什么高温?"
文科生?
打回去google
Brake fluid boiling point
Brake fluid vaporizing
Brake Fade
不懂车不要紧,不要出来丢人即可
http://en.wikipedia.org/wiki/Brake_fluid
[edit]Service and maintenance
Most automotive professionals agree that glycol-based brake fluid, (DOT 3, DOT 4, DOT 5.1) should be flushed, or
changed, every 1–2 years.[2] Many manufacturers also require periodic fluid changes to ensure reliability and safety.
Once installed, moisture diffuses into the fluid through brake hoses and rubber seals... 阅读全帖
l****z
发帖数: 29846
7
来自主题: USANews版 - Cloward-Piven Paradise Now?
By Jeannie DeAngelis
Combine class warfare, demonizing the rich, getting as many people onto the
welfare rolls as possible, and pushing the economic system to collapse and
you have a flawless formula for Cloward-Piven 2.0 -- and a vehicle that
ensures Obama remains in power.
Cloward-Piven is a much talked-about strategy proposed in the mid-1960's by
two Columbia University sociology professors named Richard Andrew Cloward
and Frances Fox Piven. The Cloward-Piven approach was sometimes referred ... 阅读全帖
A***D
发帖数: 64
8
来自主题: Classified版 - Great CFD job opportunities in Altair
The AcuSolve group is seeking talents for multiphase flow solver development
. Please see the following:
Location: Mountain View, CA
Job Description:
We are looking for an expert in the development of simulation software for
multiphase flows. We are a team of highly-motivated CFD professionals. This
is an opportunity to join AcuSolve's core development team in Silicon Valley
California and play a significant role in the development of Altair's next-
generation multiphase technology.
Altair Acu... 阅读全帖
w***n
发帖数: 1519
9
来自主题: Investment版 - 有谁研究过Small-cap Index ?
你确定看明白你给的这个链接了?这里边的所谓“各Index”,除了SP600是mid cap之
外,其它几个不都是small cap吗?
“Dispersion of returns is not as considerable an issue with Total Market
indexes, but as we go into style and smaller size indexes, dispersion of
return increases in magnitude.”

了.
h***g
发帖数: 337
10
来自主题: JobHunting版 - [合集] RP 一问
☆─────────────────────────────────────☆
trailmix (fruitnut) 于 (Fri Sep 22 15:50:47 2006) 提到:
一直想问一下: 啥是RP(人品)?为啥这个版上的人都相信攒人品能带来好工作?
有此信念的人都是相信上帝,佛祖,真主,李大师。。。或是冥冥之中的什么超自然的
神秘力量的吗? 否则攒的人品找谁去兑现呢?
还是相信周围的人看到你人品好就会愿意帮助你呢?
☆─────────────────────────────────────☆
kkkkkkkk (房书安-北美F1/H1B第一帅哥) 于 (Fri Sep 22 15:51:20 2006) 提到:
just for fun.
take it easy.

☆─────────────────────────────────────☆
Dispersive (Dispersive) 于 (Fri Sep 22 15:53:26 2006) 提到:
信这个好玩
☆──────────────────────────────────
h***g
发帖数: 337
11
来自主题: JobHunting版 - [合集] 关于resume页数和可读性
☆─────────────────────────────────────☆
summerly (summerly) 于 (Wed Sep 27 14:07:06 2006) 提到:
十分困惑,看到很多sample都是为了弄成一页,把字号调成芝麻大,white space几乎
找不出来,整整一页都是密密麻麻的字。
但是大家都说fresh graduate还是弄在一页好,所以想问问关于页数和可读性利弊的问

☆─────────────────────────────────────☆
OrangeBloss (Orange) 于 (Wed Sep 27 14:08:31 2006) 提到:
2-page is ok
☆─────────────────────────────────────☆
Dispersive (Dispersive) 于 (Wed Sep 27 14:11:29 2006) 提到:
industry: 1 page
most ppl just spend 10 sec on a resume.
make some experie
m*****e
发帖数: 148
12
我们组正在招人,有意者请给我发邮件: m*******[email protected]
最好不要站内邮箱,我很少看
Web Software Engineer
KEY JOB RESPONSIBILITIES
• Minimum Degree in IT or Computer science
• Possess the technical competence to design, build, test and
maintain innovative Intranet based systems
• Strong knowledge in PHP is a must with hands on experience
• Have strong HTML skills and experience in HTML, AJAX, XML, CSS,
JAVASCRIPT
• Relational database design with MySQL
• Familiarity with v... 阅读全帖
A***D
发帖数: 64
13
来自主题: JobHunting版 - Great CFD job opportunities in Altair
The AcuSolve group is seeking talents for multiphase flow solver development
. Please see the following:
Location: Mountain View, CA
Job Description:
We are looking for an expert in the development of simulation software for
multiphase flows. We are a team of highly-motivated CFD professionals. This
is an opportunity to join AcuSolve's core development team in Silicon Valley
California and play a significant role in the development of Altair's next-
generation multiphase technology.
Altair Acu... 阅读全帖
o********e
发帖数: 34
14
来自主题: Postdoc版 - Postdoc position at NIST (转载)
【 以下文字转载自 Macromolecules 讨论区 】
发信人: olivertree (Life is good), 信区: Macromolecules
标 题: Postdoc position at NIST
发信站: BBS 未名空间站 (Wed Feb 29 19:39:22 2012, 美东)
We are seeking candidates for a postdoctoral position focused on
understanding and controling the microstructures and dispersion in carbon/
polymer nanocomposites at the National Institute of Standards and Technology
's Center for Neutron Research, Gaithersburg, MD. The aim of the work is
to understand and control the microstructures and... 阅读全帖
s********u
发帖数: 1054
15
Deal on Ireland's euro85B bailout could come Sunday
Irish official says EU-IMF loan deal could come Sunday, rejects report of
high interest rate
ShareretweetEmailPrintTopics:InternationalEconomy, Government & Policy
In this photo taken on Nov. 25 2010 an exit sign hangs beside a sign from
the Bank of Ireland at one of its branches in Central Dublin, Ireland.
Senior bonds of Allied Irish Banks and Bank of Ireland slumped Friday, Nov.
26, 2010, amid concern the government will force holders of suc... 阅读全帖
a**********2
发帖数: 355
16
来自主题: Stock版 - 高盛每日晨报 4/1
Americas : Market Intelligence – Morning Update
微信公众平台 USOPTIONS
by Chris Hussey
Published April 1, 2014
Stocks in Asia traded Tuesday with a slight positive bias as China's
official March PMI Manufacturing survey came in a touch better than expected
(50.3 vs 50.1 consensus). Japan's Nikkei index was the notable
underperformer as the country implements a 300bp higher sales tax today and
the February Monthly Labor Survey showed a disappointing 30bp decline in
wages - this despite concerted eff... 阅读全帖
M*****5
发帖数: 3990
17
来自主题: NewJersey版 - 以后是不是什么都不能吃了
see what FDA says...
How will the radiation affect fish and seafood that have not yet been fished
or harvested?
The great quantity of water in the Pacific Ocean rapidly and effectively
dilutes radioactive material, so fish and seafood are likely to be
unaffected. However, FDA is taking all steps to evaluate and measure any
contamination in fish presented for import into the US.
Steam with radionuclide contamination disperses in the air and deposits on
water/ground surface. Over how wide an area ... 阅读全帖
H**********y
发帖数: 7928
18
来自主题: NewJersey版 - 以后是不是什么都不能吃了
大上周去日本超市,看到生鱼片明显没人买了,都降价了。
我。。。。。。也没敢买 :(

see what FDA says...
How will the radiation affect fish and seafood that have not yet been fished
or harvested?
The great quantity of water in the Pacific Ocean rapidly and effectively
dilutes radioactive material, so fish and seafood are likely to be
unaffected. However, FDA is taking all steps to evaluate and measure any
contamination in fish presented for import into the US.
Steam with radionuclide contamination disperses in the air and deposits on
w... 阅读全帖
i*r
发帖数: 83
19
好像还是有点靠谱的
Military Crew Said to Be Exposed to Radiation, but Officials Call Risk in U.
S. Slight
By WILLIAM J. BROAD
Published: March 13, 2011
The Pentagon was expected to announce that the aircraft carrier Ronald
Reagan, which is sailing in the Pacific, passed through a radioactive cloud
from stricken nuclear reactors in Japan, causing crew members on deck to
receive a month’s worth of radiation in about an hour, government officials
said Sunday.
Multimedia
Interactive Feature
The Crippled Japa... 阅读全帖
w*****t
发帖数: 422
20
来自主题: Outdoors版 - 一般到山里backpacking的话。。。
也对这个问题感兴趣,查了一下,国家公园应该比较难找到随意扎营的地方。但
NATIONAL FOREST标准低一些。但要求如下:
Dispersed Camping
Campers can go anywhere in the National Forest outside of a designated
campground not posted as closed. Chose a campsite on bare or compacted soil
when possible, or areas that have already been established. Avoid alpine
meadows. For the best information on dispersed camping opportunities, please
contact theranger district offices.
Campers are subject to the following restrictions:
Do not blaze new roads to campsite... 阅读全帖
d********t
发帖数: 9628
21
来自主题: PhotoGear版 - 发现镜头有点小问题
Found this on image-resource, damn!
Lens. The lens that ships with the E-PL1 is a modified version of the
original 14-42mm f/3.5-5.6. It has the letter "L" wedged into the name
before the "ED" designation. On Canon optics, L stands for Low Dispersion,
which suggests a quality, more expensive lens. But ED fills that function on
Olympus lenses, standing for Extra-low Dispersion. So L must stand for Low-
cost, or just match the L in "E-PL1." The only major difference I found was
the polycarbonate b
d**d
发帖数: 389
22
来自主题: PhotoGear版 - sigma的30/1.4能用在全副上吗?
哎。
For use with smaller chip APS-c and 4/3 cameras only
HSM (Hyper-Sonic Motor) ensures a quiet & high-speed auto focus
Aspherical glass elements offer correction for distortion
Special Low Dispersion (SLD) & ELD (Extraordinary Low Dispersion)glass p
rovides optimum color correction & sharpness
A lens hood, front/rear lens cap and carrying case are included with the
lens.
f****e
发帖数: 679
23
来自主题: PhotoGear版 - 无敌兔之后,何时会出无敌三?
也不一定,网上有人讨论没准大炮想把泥坑打翻在地,再踏上一只脚呢,趁着D800难产
,先出5D3,彻底把entry level全幅市场抢占。
下面是FM上面的讨论:
5D MK III in October?

ohsnaphappy
Offline
Image Upload: Off
Registered: Jun 29, 2011
Total Posts: 116
Country: United States
p.1 #1 · 5D MK III in October? Rate:
1 2 3 4 5
3.5
According to Canon Rumors the new 5D will be available in October. He said
he always expected the new 5D to launch prior to the new 1D. Pretty exciting
!
Edited on Aug 25, 2011 at 08:18 AM · View previous ver... 阅读全帖
B*****I
发帖数: 1378
24
来自主题: PhotoGear版 - 奔几个蛋
dispersion应该不难看到,但是不同玻璃dispersion的区别很大么,对肉眼
B*****I
发帖数: 1378
25
来自主题: PhotoGear版 - 奔几个蛋
dispersion应该不难看到,但是不同玻璃dispersion的区别很大么,对肉眼
G*******g
发帖数: 3729
26
新版本
The Sigma 120-300mm f/2.8 DG OS HSM Lens for Canon is a telephoto zoom lens
featuring a fast, constant f/2.8 maximum aperture. This lens is the first
lens designed under Sigma's new Sports line of lenses, making it well-suited
for fast-moving subjects such as wildlife, nature, aviation, racing, and
other similar situations.
Featuring a dust- and splash-proof construction, this lens is ideally-suited
for use in outdoor and adverse conditions. Its design features rubber focus
and zoom rings as... 阅读全帖
S*1
发帖数: 622
27
来自主题: PhotoGear版 - sigma dp0!! Q
“In order to achieve the highest optical performance, the dp0 lens features
four “F” Low Dispersion (FLD) glass elements, which have performance
equal to fluorite, two Special Low Dispersion (SLD) glass elements, and two
aspheric lenses, including a wide double-sided aspheric lens.”
比较期待这个镜头的表现
y*b
发帖数: 3190
28
来自主题: PhotoGear版 - Tokina annoucned AT-X 24-70 F2.8 PRO FX
"Tokina, has officially announced the full-size corresponding large aperture
standard zoom of "AT-X 24-70 F2.8 PRO FX".
- full-size SLR interchangeable lens for "AT-X 24-70 F2.8 PRO FX" Announces
Kenko Co., Ltd. announced that it will launch for Nikon and Canon of the "AT
-X 24-70 F2.8 PRO FX" as a full-size SLR interchangeable lenses.
Glass molded aspherical lenses three, by adopting the ultra-low dispersion
glass sheets 3, and the correction resolution of the periphery, the
peripheral light am... 阅读全帖
H********g
发帖数: 43926
29
来自主题: Joke版 - 天文学家们看过来,哈哈
"Perytons" are millisecond-duration transients of terrestrial origin, whose
frequency-swept emission mimics the dispersion of an astrophysical pulse
that has propagated through tenuous cold plasma. In fact, their similarity
to FRB 010724 had previously cast a shadow over the interpretation of "fast
radio bursts," which otherwise appear to be of extragalactic origin. Until
now, the physical origin of the dispersion-mimicking perytons had remained a
mystery. We have identified strong out-of-band e... 阅读全帖
s**********n
发帖数: 3199
30
嗯,上次木有贴,这个co讨厌的家伙,可以送他这段:
"For, in truth, there is no sure way of holding other than by destroying,
and whoever becomes master of a City accustomed to live in freedom and does
not destroy it, may reckon on being destroyed by it. For if it should rebel,
it can always screen itself under the name of liberty and its ancient laws,
which no length of time, nor any benefits conferred will ever cause it to
forget; and do what you will, and take what care you may, unless the
inhabitants be scattered and... 阅读全帖
j*****6
发帖数: 1059
31
来自主题: TrustInJesus版 - 圣灵在旧约里出现过几次?
亨利马太的圣经注释,仅供参考
Jhn 14:15-17
Christ not only proposes such things to them as were the matter of their com
fort, but here promises to send the Spirit, whose office it should be to be
their Comforter, to impress these things upon them.
I. He premises to this a memento of duty (v. 15): If you love me, keep my co
mmandments. Keeping the commandments of Christ is here put for the practice
of godliness in general, and for the faithful and diligent discharge of thei
r office as apostles in particular. N... 阅读全帖
l**********1
发帖数: 5204
32
来自主题: Biology版 - 学术交流谈论帖
Please refer:
Entropy 2009, 11(4), 606-633; doi:10.3390/e11040606
Economies Evolve by Energy Dispersal
Author: Arto Annila and Stanley Salthe
Received: 17 September 2009 / Accepted: 14 October 2009 / Published: 21
October 2009
Abstract:
Economic activity can be regarded as an evolutionary process governed by the
2nd law of thermodynamics. The universal law, when formulated locally as an
equation of motion, reveals that a growing economy develops functional
machinery and organizes hierar... 阅读全帖
l**********1
发帖数: 5204
33
来自主题: Biology版 - 才发现deseq除了2,好太多
pls refer
>
One issue with RNA-seq data, however, is that the variance of this
probability among different individuals of a group is substantially higher
than the mean, with respect to many genes (Anders, Huber 2010). A Poisson
distribution assumes an equal mean and variance, and is therefore not a good
fit. This issue, known as “overdispersion,” has inspired statistical
software authors to adopt other models, particularly the negative binomial (
NB) distribution, which is characterized by an ad... 阅读全帖
y***e
发帖数: 6082
34
来自主题: Chemistry版 - paper help!
Bakshi, Mandeep Singh; Jaswal, Vivek Sheel; Possmayer, Fred; Petersen, Nils
O. Solution phase interactions controlled ordered arrangement of gold
nanoparticles in dried state. Journal of Nanoscience and Nanotechnology
(2010), 10(3), 1747-1756.
Effect of Substituted Group of Cyclodextrin Derivatives on the Dispersing
of Carbon Nanotubes
Journal of Dispersion Science and Technology, 1532-2351, Volume 31, Issue 3,
2010, Pages 353 - 358
q****i
发帖数: 6923
35
来自主题: Chemistry版 - paper help baozi thanks
Preparation of almost dispersant-free colloidal silica with superb
dispersibility in organic solvents and monomers
Journal of Nanoparticle Research (2011), 13, (9), 3885-3897. Publisher: (
Springer, ) CODEN:JNARFA ISSN:1388-0764.
Effect of organic solvents on the preparation of silica microspheres by
hydrolysis of TEOS
Xiyou Jinshu Cailiao Yu Gongcheng (2007), 36, (Suppl. 1), 180-183.
Surface modification of colloidal silica particles
Colloid and Polymer Science (2001), 279, (2), 114-121.
Solubi... 阅读全帖
p******s
发帖数: 193
36
想照着2009年邓春晖Angew chemie的Fe3O4@SiO2@PMMA 的文章,做这个东西,用来接功
能蛋白
大家看看,最后的聚合不需要引发剂么?
前文不赘述了,Fe3O4@SiO2-MPS 已经合成好了
要往上面修饰PMMA了,
The sandwich structured Fe3O4@SiO2@PMMA microspheres were synthesized via an
aqueous-phase radical polymerization. Typically, in a three-necked round
bottom flask (100 mL) equipped with a mechanical stirrer, a refluxing
condenser, and a nitrogen inlet, 10 mL of ethanol dispersion of Fe3O4@SiO2-
MPS microspheres were mixed
with 50 mL of aqueous solution containing 5.0 mg of ... 阅读全帖
f*****g
发帖数: 30
37
For MIMO, it is difficult to deal with a dispersed channel. There is a
method called generalized decision feedback equalizer (GDFE). But it has
high complexity and is not practical currently. OFDM provides an easier way
to deal with dispersed channel (also called frequency selective fading).
Each sub-carrier can be considered as an independend flat-fading channel
during MIMO processing. Therefore, the concept, design and implementation
are all much easier.
b****r
发帖数: 2555
38
Both dispersion and nonlinear effect should be negligible for 4m of
fiber transmission.
From the data sheet of your fiber, you should be able to calculate
L_d(dispersion length) and L_n(nonlinear length) for your fiber. And
they should be much large than 4 meters.
So I would say it is the bandwidth of your fiber limits.
b****r
发帖数: 2555
39
Yes, dispertion might impact on a 30nm signal. That is why I suggest him
to calculate L_d.
But follow your logic, if we have a 1000km fiber, the signal will disperse
like crazy, you might get a much broader signal. And FT of the signal gives
you a delta function in frequency domain - do you think that is physically
possible? Why we need something called filter? Any highly dispersive structure
should do the work, right?
h*****k
发帖数: 744
40
来自主题: Environmental版 - Postdoctoral position in air pollution (ZT)
Stanier research group at The University of Iowa is now accepting
applications for a post doctoral researcher. Position to start in or around
September 2007. Research will focus on exposure model development for
prediction of ultrafine particles and gases from roadway sources. We will
combine a 3D airshed model with dispersion and aerosol dynamic models.
Experience in air pollution dispersion, 3D modeling, and/or FORTRAN is
highly desirable. Funding for this position is 3 years, renewed annually
s*********y
发帖数: 2653
41
来自主题: Environmental版 - 包子问几个考FE/EIT的问题
一般咨询公司都这样,能招美国小本就招小本,博士对他们来说的确是over-qualified
了,你有绿卡,可以试一下TCEQ 我不知道他们有没有职位在招人
做air permitting里面有toxic evaluation部门用dispersion modeling来算什么
cancer risk之类的,具体的细节我不清楚,版上有人在咨询公司和工业界做air
permitting的,你可以问问

dispersion
b*******n
发帖数: 29
42
来自主题: Macromolecules版 - Scattering A in B or B in A
I think the way polymer dispersing in water is very different
from the way water dispersing in polymer, e.g., water aggregates
then coalesces, which forms very good spherical structure. However,
Non-water soluble polymer in water tends to aggregates, but is hard to
coalesce, which forms a fractal structure.
This is only my GUESS.

negtive
b*******n
发帖数: 29
43
来自主题: Macromolecules版 - Scattering A in B or B in A
Oh boy....
A and B are bi-continuously dispersed.
Then what is the point to discuss who is in who?
Are you working with polymeric surfactant?
Bi-continuously dispersed system is too concentrated
to apply simple SANS model without huge modification.
o********e
发帖数: 34
44
来自主题: Macromolecules版 - Postdoc position at NIST
We are seeking candidates for a postdoctoral position focused on
understanding and controling the microstructures and dispersion in carbon/
polymer nanocomposites at the National Institute of Standards and Technology
's Center for Neutron Research, Gaithersburg, MD. The aim of the work is
to understand and control the microstructures and dispersion by studying the
self assembly of carbon nanoparticles. The primary tools will be Small
Angle Neutron Scattering (SANS) as well as Neutron Refelcto... 阅读全帖
p******s
发帖数: 193
45
【 以下文字转载自 Chemistry 讨论区 】
发信人: pastoris (锦涛喇嘛), 信区: Chemistry
标 题: 求指教一个纳米fe3o4@sio2@pmma合成中,pmma的聚合条件
发信站: BBS 未名空间站 (Tue Apr 22 10:27:16 2014, 美东)
想照着2009年邓春晖Angew chemie的Fe3O4@SiO2@PMMA 的文章,做这个东西,用来接功
能蛋白
大家看看,最后的聚合不需要引发剂么?
前文不赘述了,Fe3O4@SiO2-MPS 已经合成好了
要往上面修饰PMMA了,
The sandwich structured Fe3O4@SiO2@PMMA microspheres were synthesized via an
aqueous-phase radical polymerization. Typically, in a three-necked round
bottom flask (100 mL) equipped with a mechanical stirrer, a refluxing
conden... 阅读全帖
l****n
发帖数: 157
46
来自主题: ME版 - 做过的东东1.1
EE信号与系统,最基础的,把系统的输出B(t)和系统的输入A(t),在频域内除
C(w)=B(w)/A(w), 再把C转回时域,就是系统的冲激响应。ok, 于是我们解决
了这个输入信号不够短的问题。不需要高频器件,数学方法也能用。
pine提到看相角,我不是很明白,注意这里不能认为返回来的信号波形和发出
去的波形相似。实际上返回来的信号,已经在多层材料的多个界面来回反射
和透射,一次反射,二次反射。。。一次透射的反射,二次透射的反射。。。
是个子子孙孙侄子侄孙反射透射在时域的大总汇了,全都搅在一起。其次不同
频率的波在材料中传输,有dispersion. 波形会变。
或许我该去看看关于雷达的书。pine给几各关键词吧,给我个开头的地方。不
过我不是很相信单纯信号处理能够解决这个问题。比如雷达算法是否能够从多
次回波的叠加信号中分析出这多次回波之间的关系?还有材料里的dispersion
我猜雷达算法估计不会考虑的。
转回来接着讲,话说我们拿到了层状结构的冲激响应。现在是一大串脉冲,从
零时刻发出冲激脉冲,然后在t0, t1, t2, t3, t4.... 很多时间点得到返回的
脉冲。靠
A***D
发帖数: 64
47
The AcuSolve group is seeking talents for multiphase flow solver development
. Please see the following:
Position: Senior CFD Software Developer for Multiphase Technology
Location: Mountain View, CA
Job Description:
We are looking for an expert in the development of simulation software for
multiphase flows. We are a team of highly-motivated CFD professionals. This
is an opportunity to join AcuSolve's core development team in Silicon Valley
California and play a significant role in the devel... 阅读全帖
c*s
发帖数: 2145
48
来自主题: NanoST版 - 豆腐文摘:08/31/07
this is really a piece of interesting work.
Horst Weller has been working quantum dots for more than a decade. It is
interesting in many aspects:
1. the crystalline corelation between CdSe and the nanotube substrate
2. the electronic structure of thus composite, the bad gap with the fermi
level of CNT, which may lead to some novel properties
3. how thus modification of CNTs will change their dispersity?
I did not read the paper, however, as long as the water or oil dispersity of
the composite is
d*****c
发帖数: 59
49
来自主题: NanoST版 - Questions about Raman on CNT
For CNT thin film characterization, would FT-Raman be useful?
Or do we have to use Dispersive Raman? (For thin films, we have
to use microscope to help focusing)
We have been using other's dispersive raman,the excitaion laser is 785nm.
Now, we are thinking to upgrade our FT-IR system into raman range.
Just wondering if there is any chance we can do that?
Any response will be appreciated.
(sorry i can't type in chinese here)
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