w*****h
发帖数: 231 | 1 D是来源于Diamond，我是第一次听说。不过，现在对于graphene的D,G 2D都已经搞得很
清楚了。
对graphene而言：
D峰不是对应的是sp3,而是碳环的breathing mode.就是环的大小变化.对应声子有有限
动量,因为动量守恒,所以在没有defect的情况下是不会出现的。2D is the overtone
of D. The momentum is conserved because two phonon with opposite momentum.
The scattering path is pretty clear now for D and 2D.
G is the zone center mode in which two sub-lattices vibrate relative to
each other. |
|
h***o
发帖数: 350 | 2 Lattice vibration spectra. Part LXXXII. Brucite-type hydroxides M(OH)2 (M =
Ca, Mn, Co, Fe, Cd) — IR and Raman spectra, neutron diffraction of Fe(OH)2
H.D. Lutz
H. Möller,
M. Schmidt
Journal of Molecular Structure
Volume 328, 1 December 1994, Pages 121–132
Thank you very much. |
|
y********4
发帖数: 33 | 3 【作者】:
Shen, Rongan; Zeng, Ruosheng; Yin, Yuehong; Wan, Jie; Sun, Zhiguo; Zhao,
Yunqiang; Zhao, Haixing
【文题】:
Facile Synthesis of Mn-Doped ZnS Nanocrystals and Determination of Critical
Temperature for Lattice Diffusion Process
【期刊名，年份，卷，起止页码】:
Journal of Nanoscience and Nanotechnology, Volume 12, Number 11, November
2012 , pp. 8356-8363(8)
【链接】:
【求助者email】:
【求助者是否发包子】: |
|
M****l
发帖数: 1954 | 4 分子模拟本身在工业界用的不是非常广泛，Exxon, P&G, Merck,这样的大公司虽然有人
做，但是也就是3-5个人，很难有新的位置出来。分子动力学本身，体系太小，结果不
好验证，难以scale up不能够很快转化成生产技术。工业界把它当成一种长线投资。
如果想进工业界的话，在其他化工模拟方向上多下点功夫。这几年，discrete
particle simulation, lattice boltzman, 方向应用的比较多，工业界会比较感兴趣
。本身这方面的模拟和分子模拟很接近，但是scale更大，可以实验验证。如果能够和
导师商量在这方面下点功夫，做一个课题，应该很有帮助。
另外，流体，固体（CFD, FEA）方向，利用在学校的机会，多听些课和seminar。不用
对理论有太多的研究，了解基本原理，能用软件，解决简单的问题，做一两个project,
简历上写出来。这个是工业模拟的主流方向（还有就是优化和控制，但学起来可能要更
多时间）
总之，要想在工业找，视野要宽，会的要杂。本身这些模拟有很多相通的地方，你还有
两年时间好好拓展一下，还有很多机会。节约成本是所有公司都面临的问题... 阅读全帖 |
|
|
A********e
发帖数: 354 | 6 BSF让老包自己开价，转让技术。http://www.sciencemag.org/content/344/6184/616.full
The efficient use of natural gas will require catalysts that can activate
the first C–H bond of methane while suppressing complete dehydrogenation
and avoiding overoxidation. We report that single iron sites embedded in a
silica matrix enable direct, nonoxidative conversion of methane, exclusively
to ethylene and aromatics. The reaction is initiated by catalytic
generation of methyl radicals, followed by a series of gas-phase re... 阅读全帖 |
|
b*****r
发帖数: 29 | 7 We are currently looking for passionate and highly-motivated Ph.D. students
to carry out analytical and computational studies on micro-/nanofluidics and
soft materials. The focus of our research group encompasses modeling the
following phenomena: electrokinetic flows in confined geometries, deposition
of colloidal particles during evaporation, dynamic self-assembly of
nanoparticles, self-healing polymer nanocomposites, vesicle-particle
interactions, and wetting and slip on superhydrophobic surfa... 阅读全帖 |
|
b*****r
发帖数: 29 | 8 代朋友发帖
1. Research Assistantship (RA) for a PhD Student in Mechanical Engineering
An NSF-funded research assistant position is available for a new PhD student
in Mechanical Engineering at the State University of New York (SUNY) at
Binghamton. The research is focused on materials printing using a hybrid
inkjet-electrospray technique. The goal is to print highly-ordered
monolayers of functional nanoparticle inks at high throughput. The student’
s research will be experimental; however, close collab... 阅读全帖 |
|
|
t*******y
发帖数: 2424 | 10 吸硫塔FGD是tank, 60ft diameter, 100ft high. 和lattice tower 不像，更象LNG.
为嘛
干了LNG转不了transmission? 另外transmission 不只是电，气也有，LNG才是gas
tran的近亲。
你觉得土木里有什么方向会每周被骚扰？咱不是CS. 你还要求定地点。 |
|
sc
发帖数: 122 | 11 我听说
dipole-dipole interaction似乎是不能cutoff的
至少off-lattice是这样 |
|
h****y
发帖数: 26 | 12 各位师兄师姐师弟师妹，方便的话帮我找一下这篇文章，急用，谢谢。
找到的话请发到w********[email protected].
Extensional motions of spatially periodic lattices
Kraynik
International Journal of multiphase slow, 1992, Vol:18, issue:6, page 1045 |
|
k*********g
发帖数: 791 | 13 那我可能跟“powerflow”混起来了。
去查了一下，flow3d 是 finite difference based。
那就更差了，有限差分用 structured grid，无法成为 all purpose software
finite differnce、finite element、finite volume，
管她37二十一，全是烂方法，全是1980年代的落后技术。
用lattice boltzmann的那个
EXA 比较有点创新，蛋我对它的效率非常怀疑。 |
|
w********e
发帖数: 385 | 14 没做过project? research啥的都写上，如果还有别的实习什么的工作经历都加上，
career fair先拿不想去的公司练手，上公司网站投简历，投之前多改几次。
Advanced Micro Devices (AMD)
Analog Devices
ARM Ltd
Aricent
ATI Technologies
Broadcom
Conexant
Cypress Semiconductor
DALSA Semiconductor
Freescale Semiconductor
IBM
Infineon
Intel
KPIT Cummins
Lattice Semiconductor
Linear Technology
Micron Technology
National Semiconductor
NEC
NeoMagic
NVIDIA
NXP Semiconductors
Portal Player
Qualcomm
Rambus
Renesas Technology
Sandisk
Sarnoff
Sasken Communication Technologies Li |
|
a*******i
发帖数: 11664 | 15 some:
1. nitrides没有合适的substrate. 很多人在用各种方法做GaN substrate, 可能近一
两年内会有突破,但是成本和时
间是个问题. 号称要提前3-6个月预定.
2. high dislocation density, partially due to lack of substrates
3. p-doping, 不完全是growth problem
4. AlGaN/GaN, or AlN/GaN interface roughness not good, 去问wkwk, 他做这个
5. for InGaN/InN on GaN, large lattice mismatch, for high In composition
InGaN, you may have phase
separation |
|
n*l
发帖数: 44 | 16 恩, 你说的是对的.. 我又翻了一下 Razavi, 里面说, (this) leads to more carrier
scattering and hence lower mobility.
不过不明白为什么 carrier scattering will become more severe at silicon
surface.. 我想可能是因为 silicon surface 的 crystal lattice 有更多的 defects
... 不知道这样理解对不对.. |
|
d****o
发帖数: 1112 | 17 这不是被firmware team给搞没办法了嘛
其实挺简单的一东西，就是因为不能改firmware，所以纠结啊
推荐一个power sequencer, monitor
Lattice的POWR1014A,便宜好用，大概4，5块钱
能监视10个模拟输入，4个数字输入，10个输出控制时序
还有俩可以驱动NFET的输出
I2C接口，内部有类似CPLD的东西供编程用
软件好用，基本上10分钟就上手了
推荐
Analog有更好的，但是价格一般贵一倍以上。 |
|
c*b
发帖数: 3126 | 18 Lattice, Xerox, Mentor Graphics, Synopsys
还有一堆小的 |
|
w********o
发帖数: 10088 | 19 CNT可能比较难吧，除非能在si衬底上垂直生长，做vertical的结构，否则不可能大规
模生产啊
III-V的GaAs在Si上，很久前就做过了。长材料不成问题。但是集成的时候，需要把
substrate磨薄，GaAs里面residual的应力太大，成品率很低。尤其是现在都是6"往上
走，很难做
GaP和Si倒是lattice match，生长不知道难度如何，做的人还不太多
我不喜欢mos的原因是，总觉得这种平面结构的器件，无论epi还是process的window都
比较窄，一点变化就会引起电流的明显改变，不稳定。现在越来越喜欢垂直结构了，但
是垂直结构也有自己的问题。说不定以后器件就是一部分垂直，一部分平面 |
|
w********o
发帖数: 10088 | 20 InGaAlP一般都lattice match么?如果是,换了AlGaAs reliability会不会有问题 |
|
b**s
发帖数: 231 | 21 最近的两个小的： lattice买了simg；Mxl买了entropic（两个都是烂公司） |
|
W***n
发帖数: 11530 | 22 You have a bright future, just gain some experience and return home to kick
off a long lasting rewarding career.
Here are a list of semi companies involved in mixed-sginal IC:
ACCO Semiconductor, Inc. Actions Semiconductor Co., Ltd. Adapteva, Inc.
Advanced Micro Devices, Inc. (AMD) Aeroflex Colorado Springs Altera
Corporation
Ambarella, Inc. Ambiq Micro Inc. AMIMON Ltd.
ams AG Analog Devices, Inc. (ADI) Analogix Semiconductor, Inc.
Apexone Microelectronics Applied Micro Circuits Corporation (App... 阅读全帖 |
|
z***8
发帖数: 461 | 23 半导体整合非常厉害，今天lattice也被一家中国基金收购了，以后找工作都会越来越
难了。 |
|
z***8
发帖数: 461 | 24 半导体整合非常厉害，今天lattice也被一家中国基金收购了，以后找工作都会越来越
难了。 |
|
h***z
发帖数: 122 | 25 Xilinx有很多defense项目。美国政府是不可能同意中国公司买的,甚至lattice都可能
过不了关
这几年大的semi m/a都不是中国买的，几十个B对于资本市场不是很多。 |
|
f*******U
发帖数: 19 | 26 Ab Initio and Classical Molecular Modeling of Multiphase Heat/Mass Transport
and/or Energy Storage Materials
The Complex Fluids and Multiphase Transport Laboratory within the Department
of Mechanical Engineering and Mechanics at Drexel University is looking for
a well-qualified postdoctoral researcher to work on ab initio and classical
atomistic modeling of multiphase heat and mass transport and/or energy
storage materials. The candidate should have experience on either liquid-
vapor phase chang... 阅读全帖 |
|
d******w
发帖数: 164 | 27 各位朋友大家好，现在申请绿卡急需审稿机会，我的方向是Transport phenomena and
fluid dynamics, inkjet, CFD, additive manufacturing, Lattice Boltzmann,
printed electronics. 工程方向博士毕业两年，发过相关方向的文章二十来篇，审稿
一直都认真负责。
万分感谢。 |
|
|
c*****e
发帖数: 238 | 29 I think dynamic/static light scattering is used for determination of the
structure factor for density fluctuation in phase transitions,
usually at the length scale of the wavelength of light.
X-ray scattering is used to determine the crystal lattice constants.
Neutron scattering could be used to determine the correlation functions of
deutrium, mostly used to characterize the conformation of a single chain,
what I know about SANS is it can be used to measure Rg. |
|
l******l
发帖数: 9 | 30 【 以下文字转载自 Chemistry 讨论区 】
【 原文由 loudbell 所发表 】
就是把模拟计算输出的坐标划出晶体结构图和动画来。
网上有那种可以免费下载的吗？
多谢！ |
|
c*******n
发帖数: 1648 | 31 Material Studio, you have to buy one.
Free software are available but I don't know where you can get them |
|
b*****y
发帖数: 19 | 32 polymer model based on lattice-gas model which is
interacting via long-range force, say, electrostatic
interaction. or some about the charge fluctuation.
Thanks a lot. |
|
d*****s
发帖数: 313 | 33 I supposed when you mention doing reflectivity experiments with
your silicon wafer you already have your macromolecular sample coated
on it.
The first peak most likely is the peak from your coating. The length
scale makes perfect sense for intermolecular interaction. The sharp
peak looks like what you might have from silicon--it is easy to be
determined. You can just figure out the d-spacing of the sharp peak
and look up the lattice parameters of silicon and do a simple calculation
to see if it |
|
a***n
发帖数: 578 | 34 Hehe. heard his presentation. pretty good.
of course also include bluffing parts. keke.
highlight points:
1) using different substrate's lattice parameter to control the crystal
direction of nanowire. such as 001 111 etc. very useful.
2) using switchable growth technique (switch between MOCVD and laser assistant
growth) to control different structural shapes of nanowire. The plump he
growed is really impressive.
3) using switchable growth source to control component of nanowire. such as
Si/Ge na |
|
C***S
发帖数: 175 | 35 I just need some simple qualitative comparison among different models.
I read some paper where they just need to know some geometry parameters,
and they can give the profile. But seems it is kind of too simple.
My model will be some clusters ditributed in polymer matrix. What I want
to do is, set up some gerometrical parameter of the clusters, and their
3D lattice, then, I can find some method to compute the SAXS profile.
I am learning the package from NIST. The problem is I have no control of
t |
|
b*******n
发帖数: 29 | 36 呵呵，我看到你的帖子很感兴趣，我的观点如下，
1，“3D lattice”， 远程的有序，如果你的样品不是各向同性，从2D的scattering
patten可以得到很多有关取向的信息（晶区的趋向）。
2， 如果你的样品是各向同性，你可以仿照 Fractal object dispersion 来套用
模型，可以得到clusters 的维数， primary particle size 等等信息。
3， 困难1： incoherent scattering 用背景减去不是很容易。困难2：structure
factor 很难近似为1。
can be
for
the |
|
|
D********g
发帖数: 533 | 38 计算混合焓的时候的体积分数 是不同种lattice之间的体积分数。溶剂A和高分子B，那
么可以取溶剂分子和高分子一个聚合单元大小的平均来作为单位格子大小，然后计算各
自所占的格子数。
对于到底应该是摩尔体积还是实际含量体积的话。我觉得应该是实际含量的体积-》摩
尔体积比-》格子数比-》格子化的体积含量 来计算 |
|
s******t
发帖数: 134 | 39 Artin's Algebra is quite good, however not too much about lattice,
just mention the definition and several examples.
I think that for group theory,
any books about abstract algebra are quite the same. |
|
l*****e
发帖数: 65 | 40
i don't get your question, but i would like suggest that you may consider
first the case n=0. and a_0=1. then try to draw some conclusion.
hope it helps. |
|
l****e
发帖数: 23 | 41 http://front.math.ucdavis.edu/math.AG/0608265
or
http://arxiv.org/abs/math.AG/0608265
Mathematics, abstract
math.AG/0608265
From: Fred W. Roush [view email]
Date: Thu, 10 Aug 2006 17:12:25 GMT (16kb)
Counterexample to the Hodge Conjecture
Authors: K. H. Kim, F. W. Roush
Subj-class: Algebraic Geometry
MSC-class: 14C30
We show that the Hodge conjecture is false in general for products of surfaces. We construct a K3 surface whose
transcendental lattice has a self-isomorphism which is not a linear |
|
l*****e
发帖数: 238 | 42 consider an n+1 by n+1 lattice, (i,j) with i,j=1,...,n+1
n choose 2 = number of points such that 1<=i
once you do select such 2 numbers, you get a point (i,j), this is part A
n+1 choose 2 = number of points such that n+1>=i>j>=1
similarly each such pair will give you a point,
but now instead of picking (i,j), we pick (i-1,j), this is part B
Union of A and B is the n by n sublattice with n^2 points.
does this count for a combinatorial argument?@@ |
|
j**p
发帖数: 53 | 43 ...unlikely there's simple solution ... for a group of diophantine eq.s
probably one should be satisfied on just knowing some large N behavior (e.g.
density of such lattice points).. |
|
x********i
发帖数: 905 | 44 2014: Alex Kontorovich for From Apollonius to Zaremba: Local-global
phenomena in thin orbits, Bulletin AMS, Vol. 50, 2013, pg. 187-228
2013: John C. Baez and John Huerta, for "The algebra of grand unified
theories". Bulletin Amer. Math. Soc. 47 (3): 483–552. 2010. doi:10.1090/
S0273-0979-10-01294-2.
2012: Persi Diaconis for The Markov chain Monte Carlo revolution,
Bulletin AMS, Vol. 46, 2009, pg. 179–205
2011: David Vogan for The Character Table for E8, Notices of the AMS,
Vol. 5... 阅读全帖 |
|
x********i
发帖数: 905 | 45 http://iccm.mcm.ac.cn/dct/page/1
Morningside Lectures
Camillo De Lellis: The Nash-Kuiper theorem and a conjecture of Onsager
Björn Engquist: Seismic imaging and the Monge–Ampère equation
Stanley Osher: Overcoming the curse of dimensionality for certain
Hamilton-Jacobi (HJ)equations arising in control theory and elsewhere
Yuri Tschinkel: Rationality problems
Edward Witten: A new look at integrable lattice models
Horng-Tzer Yau: Spectral statistics of random graphs
... 阅读全帖 |
|
s*******o
发帖数: 3 | 46 The research there include 1) general area of mesoscale and molecular
scale simulation using the Lattice Boltzmann method and Molecular Dynamics
(MD) simulation method.
2) areas of the chemical aspects of nanofluids,
3) two phase flow. oil-water seperation
教授好像特别希望我读第一个方向，不过我觉得好像很理论，不大容易找工作的。
是不是的。其余两个方向他也搞，不知道不好不好。
谢谢了。 |
|
s*******o
发帖数: 3 | 47 老板好像是搞heat and mass transport in nanofluids
molecular scale
simulation using the Lattice Boltzmann method and Molecular Dynamics (MD)
simulation method.
这玩意好像和Industry没什么关系.
I wonder 毕业以后除了作Postdoc,faculty还能干吗阿
大家有作这个的么? |
|
y***i
发帖数: 36 | 48 Postdoc positions in fuel cell area at University of South Carolina
Post-doc position 1: Fuel cell modeling
Multi-scale modeling and micro-scale transport simulation background: such
as lattice Boltzmann method, Monte Carlo simulation, molecular dynamics,
computational fluid dynamics (CFD) , etc. A certain combination of these
methods is preferred.
Analytical electrochemistry background: fundamental understanding of
electrochemical process through modeling and experiment.
Post-doc position 2: m |
|
j******e
发帖数: 40 | 49 Hi all,
今年初拿的PhD, 做了几个月post doc, 主要搞Lattice Boltzmann Equation (LBE)算法，做
multi-phase flow (liquid-gas为主）， micro-channel flow, thermal flow。 会一
些商用cfd软件，如fluent之类的。自己的CFD code是用Fortran写的，还用CUDA写了GPU的并行
计算code加速CFD模拟，也会一些mpi并行计算的东西。
已经找了6个月工作了，还是没什么眉目。有没有人知道哪里在招搞cfd的，特别是做LBE算法的。
postdoc 或公司都可以。先谢谢啦！ |
|
f*******U
发帖数: 19 | 50 Ab Initio and Classical Molecular Modeling of Multiphase Heat/Mass Transport
and/or Energy Storage Materials
The Complex Fluids and Multiphase Transport Laboratory within the Department
of Mechanical Engineering and Mechanics at Drexel University is looking for
a well-qualified postdoctoral researcher to work on ab initio and classical
atomistic modeling of multiphase heat and mass transport and/or energy
storage materials. The candidate should have experience on either liquid-
vapor phase chang... 阅读全帖 |
|
