I doubt that you will be able to get anything meaningful
with , as difference in the random phases of the two
wavefunctions is not possible to be eliminated. How about ||^2?
Duy Le
(UCF)
On Mon, Nov 2, 2020 at 10:47 AM Thomas Brumme
wrote:
> OK, at least the different sizes were proba
This is somehow the real-life version of huge force applied on an object
https://www.youtube.com/watch?v=pP88-4AIb1c
After first step, your system is in a weird configuration that the chosen
algorithm can't solve.
Duy Le
(UCF)
On Fri, Jul 10, 2020 at 2:38 PM Coralie Khabbaz
wrote:
> Also, w
Meaning not too large. Large forces would lead to bad relaxation to
unrealistic structure that cause convergence problems
Duy Le
(UCF)
On Fri, Jul 10, 2020 at 1:13 PM Coralie Khabbaz
wrote:
> Hello Duy Le,
>
> Thank you so much for your answer. What do you mean by reasonable forces?
It could be because of non-realistic structure as a result of relaxation.
Please check the force in previously converged scf to see if they are
reasonable. If not you may need to remake the starting structure so it has
reasonable forces.
Duy Le
(UCF)
On Fri, Jul 10, 2020 at 12:53 PM Coralie
perhaps you have a wrong or very bad starting structure.
Duy Le
University of Central Florida
On Sat, Jun 6, 2020 at 5:47 AM Poonam Kaushik
wrote:
> Hello All,
> I want to do a relax calculation for FeS. The forces that I calculated is
> Total force =11.363189 Total SCF c
subroutine?
Thank you very much.
Duy Le
University of Central Florida
___
Quantum ESPRESSO is supported by MaX (www.max-centre.eu/quantum-espresso)
users mailing list users@lists.quantum-espresso.org
https://lists.quantum-espresso.org/mailman/listinfo/users
Thank Kevin,
That would explain it. It was my bad that I did not see the note.
Best,
Duy Le
UCF
On Thu, Apr 19, 2018 at 1:38 PM, Kevin May <k...@mit.edu> wrote:
> Hi,
>
> In the release notes for 6.2 it says:
>
> * Some constants in the definition of PBE functionals were
at
https://gitlab.com/zoowe/q-e/tree/master/ERROR
Version Energy [Ry]
5.0 -328.17737884
5.4.0 -328.17737884
6.0 -328.17737884
6.1.0 -328.17737884
6.2.0 -328.17776289
20180418-328.17776289
Duy Le
University of Central Florida
Please be more specific. What is the number did you get?
I am not assuming you have 8 valence electrons. Check your scf or nscf
output to see number of electrons.
DL
On Mon, Oct 2, 2017 at 12:53 PM, Nga Do <dong...@gmail.com> wrote:
> Dear Duy Le,
>
> I would like to check the va
ial with the value for cut-off energy 40 Ry for all my
> calculations.
>
> Dear Duy,
>
> Here is the plot. Please take a look.
>
> Best regards,
> Nga
>
>
>
> On Mon, Oct 2, 2017 at 2:47 AM, Duy Le <ttdu...@gmail.com> wrote:
>
>> Please post a plot,
You should try to do a normal relaxation to see if your structure is
stable. Then use the relaxed one to start vc-relax.
Duy Le
University of Central Florida
On Sat, Sep 30, 2017 at 11:34 AM, khadije alvani <khadijealv...@gmail.com>
wrote:
> Dear Q-E users,
> I try to get vc-relax
Please post a plot, instead of data file.
Thanks
Duy Le
University of Central Florida
On Sun, Oct 1, 2017 at 1:09 AM, Nga Do <dong...@gmail.com> wrote:
>
> Dear QE users,
>
> I am a new QE user and trying to calculate the electron concentration of
> pure ZnO and some diff
Or you can get wave function for each bands, then write a code to calculate
the dipoles.
pw2casino option should give you humanly readable wave function.
On Wed, Feb 15, 2017 at 10:31 AM, dario rocca wrote:
> Dear Huy Pham,
> I don't know if this is the easiest way but you
It should give zero or very close to zero, unless your calculation is not
accurate or your grid is not dense enough.
Duy Le
University of Central Florida.
On Nov 2, 2016 11:17 AM, "Uri Argaman" <argam...@post.bgu.ac.il> wrote:
> Dear QE experts
> I do a PP calculation to
Hi Wang,
You should ask that "somebody" to see what he is trying to do. These steps
look unconventional, not doable to me. I doubt that he get something
meaningful out of them.
Duy Le
University of Central Florida
On Nov 3, 2016 2:21 AM, "Q.J.Wang" <wang...@126.com> w
You need increase k-point sampling you can and reduce smearing.
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu/~dle
On Wed, Dec 18, 2013 at 3:26 PM, ehsan targholi wrote
Thank Lorenzo,
I did assure those settings. I can get identical energy. However, the
x-y forces are not going to zero.
Duy
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu
,
these values are quite small. I used lot of significant digits for
coordinates and cell parameters but they do not help.
Many thanks.
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu
You can use lsign in pp.x
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu/~dle
On Fri, Jun 28, 2013 at 6:28 AM, Davide Tiana wrote:
> Dear all,
> I would like to c
Hi,
You should take a closer look at outdir and prefix. You need
appropriate values for these parameters.
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu/~dle
On Tue, Jun
Well, if the "high spin" is not the ground state of your system, it is
very hard to achieve.
Try tot_magnetization or constrained_magnetization to enforce the high
spin state.
BTW, starting_magnetization can not be larger than 1.
---------
They are "starting" values. You can set whatever you want as long as
you get right results. However, for faster convergence, you should use
educated guesses.
------------
Duy Le
Postdoctoral Associate
Department of Physics
University of Centr
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu/~dle
On Sat, Jun 22, 2013 at 9:05 AM, Miao Gao wrote:
> Dear all?
>
> I am calculating phonon with QE-5.0.1.
>
Did you perform the test for q-mesh? I would do 2x2x1, 3x3x1 and
higher (if it is not that expensive) to see the evolution of
phonon-dispersion. Usually, 4x4x1 q-mesh is enough for converged
dispersion.
Duy Le
Postdoctoral Associate
Department
, but it is highly that you need to use something like
size = 192
aprun -n 96 -N 6 pw.x ...
If you regret to waste 1/2 node, check OPENMP for options.
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http
Hi,
The absolute value of energy level is meaning less, depending on how the
zero level is defined. You should, thus, calculate and compare work
functions or any other quantities that are the differences between energy
levels.
Best,
D.
Duy
MUST use the same number of cores for pp.
Best,
------------
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu/~dle
-- next part --
An HTML attachment was scru
not calculated or
generated during relaxation.
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu/~dle
On Thu, Jan 10, 2013 at 3:12 AM, Angga Fauzi wrote:
> Dear all QE users,
&g
Should you compare total energy per atom or total energy per unit volume?
Of course, you have to use well-converged cutoff and k-point sampling.
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http
Someone has asked exactly the same question not long ago. Google it for
more details.
Basically, you can not use Gamma only calculation.
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http
ot need to open any file since you start your calculation from
scratch
Am I rigth? Can
> anyone say why this error is happening? I managed to run the same
> simulation, but with an isolated molecule. My input follows below.
>
>
Delete outdir or change prefix will help.
---
It is usually easier for pwscfers to help you if you post error messages as
well.
BTW, what are the question marks (?) in cosAB... standing for?
-D
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website
)
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu/~dle
On Fri, Jun 29, 2012 at 9:45 AM, shayan hemmatiyan <
shayan.hematiyan at gmail.com> wrote:
> Howdy,
>
> Did you copy
You should check out how many bands you have in your calculations. It looks
like to me that you don't have that many bands.
6 C + 1 Li -> 25 electrons
----
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Webs
Yes. It should be an integer number corresponding to a band (Kohn-Sham
state) in which you are interested.
Duy Le
Postdoctoral Associate
Department of Physics
University of Central Florida.
Website: http://www.physics.ucf.edu/~dle
On Wed, Jun
Hi Gulcin,
For each Kohn-Sham state? Have you ever read the input description of PP.x?
http://www.quantum-espresso.org/wp-content/uploads/Doc/INPUT_PP.html
You just need to use appropriate plot_num and corresponding options.
-D
Duy Le
them. The tests are
very simple and easy to perform:
1. Use different potential to calculate the quantity in question.
2. Use different k-point set to calculate the quantity in question.
------
Duy Le
PhD Candidate
Department of Physics
University of Central
u don't have to modify
sumpdos.f90 and you should not mess it up if you are not familiar with
Fortran
>so it will be very?great if any one
> can tell me how.
You can use any plotting softwares to do the job. Even Microsoft Excel
can help you :)
-------
heck output to see how much memory you need for
this system.
------
Duy Le
PhD Candidate
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
It is well-known that vdW-DF and vdW-DF2 overestimate lattice
parameters of solids
See this work: Phys. Rev. B 83, 195131 (2011)
--
Duy Le
PhD Candidate
Department of Physics
University of Central Florida.
"Men don't need hand to do t
e difference between theory and experiment.
If you check literature of similar calculation (S. Hong et al, surf.
sci. 2010), you will see that your numbers are really good.
------
Duy Le
PhD Candidate
Department of Physics
University of Central Florida.
"
> ??? -7.9264? 13.7887? 13.7887? 13.7887
>
> occupation numbers
> 0.0312?? 0.0312?? 0.0312?? 0.0312
you should post your input for further advice.
--
Duy Le
PhD Candidate
Department of Physics
University of Central Florida.
"Men don
...
--
Duy Le
PhD Candidate
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Sat, Jul 30, 2011 at 11:06 AM, DONG Rui wrote:
> Hi, all
>
> Thanks for last reply.
> Now I am wondering, what is the difference
I don't remember. You can always calculate it easily:
the ratio between C6 (or R0) of Cacbon in mm_dispersion.f90 and in
dft-d3 code will give you an idea how to convert them.
--
Duy Le
PhD Candidate
Department of Physics
University of Central
you are good to go.
--
Duy Le
PhD Candidate
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Tue, Jun 21, 2011 at 10:40 AM, Vikas Varshney wrote:
> Dear All,
>
> I am trying to relax my W
restart'
> or how can I lower the cpu time ?
you can also consider to change ion_dynamics if your calculation
experiences too many iterations.
----------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need han
Have you ever done vc-relax with a much smaller system? Say 1-3 atoms.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Thu, Jun 2, 2011 at 4:12 PM, Yongsheng Zhang wrote:
tten in the output (most of parameters can be found in the output).
>
> Thank you,
>
------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
> Vi
>
>
>
st" you really meant "Independent *cutoff energy for the charge
density* convergence test"
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
> Regards.
> --
&g
are not be the same. A few % of changing in lattice
parameter (in comparison to equilibrium lattice parameter) can lead to
a huge change in the pressure.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do t
On Thu, May 26, 2011 at 10:13 AM, Sanjeev Gupta
wrote:
> ??? tstress = .true.
> ??? ecutwfc = 20,
> ??? ecutrho=200,
Did you check these cutoff values?
----------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men d
le, it is obvious that if you have only one k-point, you can
not distribute it to 2 different pools.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
> the example 03 can b
On Wed, May 25, 2011 at 11:59 AM, Paolo Giannozzi
wrote:
>
> On May 25, 2011, at 17:56 , Duy Le wrote:
>
>> But it is weird. QE does not take TMP_DIR or PSEUDO_DIR
>
> it uses ESPRESSO_PSEUDO and ESPRESSO_TMPDIR, if
> defined and not overridden by input variables
>
Righ
t;getenv". One such machine I known is IBM BG.
>
But it is weird. QE does not take TMP_DIR or PSEUDO_DIR
----------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
> PS: post from t
be important what the size of the box is.
No, it is not. It is a calculation of bunch of molecules. By changing
box size, you change the interaction between those molecules.
Eventually, those interactions are almost negligible, you'll get
isolated molecules.
>
------------
energy. You can compare the cohesive
energy with experimental or other theoretical data.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Fri, May 20, 2011 at 5:02 PM, Duy
I believe that you have asked us about the calculation for an
isolated atom sometimes ago. It was about C. You should have done the
same approach.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand
Did you optimize WELL the structure of SrFeO?
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Wed, May 11, 2011 at 5:48 AM, mayank gupta wrote:
> Hi Dear User's
>
If you can not find the equivalent mesh for a specific spacing, you
just need to list all special k-points with their weight.
And yes, you can always generate anything you want. A small, simple
code will help you to do the job.
--
Duy Le
PhD Student
ple fix, because we were afraid that people would use it as a
> black-box for spin-polarized calculations, not knowing that there is no
> spin-polarized vdW-DF"
>
> hope this helps to clarify the situation.
>
> stefano
Thank you Stefano and Thonhauser Timo for the clarification.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Wed, Apr 27, 2011 at 3:29 AM, Stefano de Gironcoli
wrote:
> the vdW energy depends on the local polarizability of the
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Tue, Apr 26, 2011 at 1:00 PM, Stefano de Gironcoli
wrote:
> Dear ?WANG Wei
> ? the vdw-DF functional form is not
If you do a little homework (such as googling keyword TD-DFPT), you'll
find this link
http://qe-forge.org/projects/tddfpt/
I have not read it carefully but I guess it contains some useful information.
--
Duy Le
PhD Student
Department of Physics
So you simply don't have a fortran compiler installed properly. Need to get
one first before compiling QE
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Sun, Apr 17, 201
Rename or make an sanple link i686-pc-linux-gnu-g95 to g95 and try. QE
looks for g95 file, you don't have it.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Sun, Apr 17,
Technology
>
>
> ___
> Pw_forum mailing list
> Pw_forum at pwscf.org
> http://www.democritos.it/mailman/listinfo/pw_forum
>
>
--
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
Maybe I am too picky. You should NOT start a new email when replying any
message in the forum. Followers can not understand what you are trying to
say. Just hit reply and do NOT delete relevant body message. Thank you.
--
Duy Le
PhD Student
error, I don't
think we can get that accuracy.
BTW, you need also to set all convergence categories to 1.0D-10 at least.
> however ... why do you need more than 10 digits ?
Perhaps to calculate Lamb Shift :)
>
----------
Duy Le
PhD Student
Departmen
Did you call pp.x or dos.x?
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Sat, Apr 9, 2011 at 11:05 AM, r s wrote:
> Dear all,
> i want to calculate density o
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Tue, Apr 5, 2011 at 5:42 PM, Tram Bui wrote:
> Dear Folks,
> I'm trying to build an input file for generating the Cs
> pseudopotential. when I
eally really appreciate your help.
> Yours
> P Shok
>
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
> Dear All,
> let me clarify a little point.
> T
.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
You can use xcrysden to find their coordinates. Or you can also use
condensed matter text book.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Tue, Mar 22, 2011 a
ed/discussed/proved? Thanks!
>
Should be in the original paper about this method, by Bl?chl et al 1994
----------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
The logic is simple:
#bands = #electrons/2+#unoccupied_bands
If you increase the size of unit cell, #atoms increase as well, so do #electrons
However, you will have something called band folding because the BZ shrinks.
--
Duy Le
PhD Student
?
> Thanks,
>
> ??? Eric.
>
------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
> On 03/09/2011 07:02 AM, Mehmet Topsakal wrote:
>
> Dear?Eric,
> In addition,?if
for isolated C, you need to do spin polarized calculation with the
usage of occupation card. See example 11 for details.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On
You should make sure that the mpiexec is used correctly. Try one of
these sameple in this link.
http://hamilton.nuigalway.ie/teaching/AOS/NINE/mpi-first-examples.html
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
&quo
You can use:
mpiexec --help
or
man mpiexec
to see how to have correct command
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Fri, Mar 4, 2011 at 1:53 PM, Alexander G
Did you check your k-point sampling?
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Wed, Mar 2, 2011 at 5:58 PM, Krukau, Aliaksandr
wrote:
> ? Dear QE users,
>
It should be cubic perovskite. So
Primitive vectors are:
a 0 0
0 a 0
0 0 a
and coordinates of atoms are:
0. 0. 0. (Au)
0.5 0.5 0. (Cu)
0.0 0.5 0.5 (Cu)
0.5 0.0 0.5 (Cu)
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
&quo
You should be able to fix magneticmoment of system at the desired
value (say 6, 6.5, 7) to see which one give you the lowest energy.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do t
for isolated atom, you need to perform spin-polarized DFT, and also
you need to fix occupation number by using Hund's rule(use occupations
card).
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand
ost of the work is in DFT+U..
>
> this should tell you something...
Right. The DFT+U paper will tell you exactly why they used DFT+U but
the regular DFT and also what are the expected results of using
regular DFT
----------
Duy Le
PhD Student
Department
.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Fri, Jan 21, 2011 at 8:15 AM, mohnish pandey
wrote:
> Dear Duy,
> ?? ? ? ? ? ? ? I have done Lowdin analysis for MnSe wurtzite and rocksalt
> str
What are the magnetic moment of Mn you got? Are they expected values?
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Fri, Jan 21, 2011 at 6:54 AM, mohnish pandey
wro
Did you check the k-mesh? Are 6 6 6 and 6 6 4 good for converged energy?
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Wed, Jan 19, 2011 at 11:57 AM, mohnish pand
Look weird, you have no fortran compiler. Check the $PATH to see if it
is correct.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Wed, Jan 5, 2011 at 9:42 AM, Paolo
exersice1 is about optimizing lattice parameter,
equation of states (that includes bulk modulus)
----------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Tue, Jan 4, 2011 at 5:06 PM, Tr
I believe that you can find detailed description here
http://www.quantum-espresso.org/input-syntax/INPUT_PW.html
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Sat, J
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Wed, Dec 29, 2010 at 6:16 PM, Tram Bui wrote:
> Dear All,
> ??? Hope everyone is having a great Holiday. would you please help me out
> with this, I'm looking for t
FYI.
There is NO truncation on the mailing list, we got all what you sent.
You gmail did it. Click Show Quote Text for full email.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do t
GDIS is a visualization software.
Koa, you need to learn which formats GDIS supports.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Sun, Oct 31, 2010 at 4:50 PM,
I doubt that QE has. Try Xcrysden.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Thu, Oct 28, 2010 at 1:22 PM, Elie Moujaes wrote:
> Dear All,
>
> I am worki
More cores may help :)
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Wed, Oct 20, 2010 at 6:51 AM, Paolo Giannozzi wrote:
> wumindt2 wrote:
>
> > Is there
link about
Summer school at Santa Barbara (2009). Download the exercise of week 1, day
1. Details and example of a band structure calculation can be found in this
exercise.
----------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
Why do you need a +0.5 pp? Can you make pp with semicore for regular Cu?
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Sat, Oct 16, 2010 at 9:17 AM, sonu kumar &
e & Engineering
> trambui at u.boisestate.edu
------
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
As the PW.html said, just count number of electrons then divide it by
2, then add 20% of that number.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Sat, Sep 18, 2010 a
.
--
Duy Le
PhD Student
Department of Physics
University of Central Florida.
"Men don't need hand to do things"
On Fri, Aug 27, 2010 at 3:29 PM, chengyu yang
wrote:
> Dear all,
> ? If I have a copper/carbon nanotube system,
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