Showing posts with label programmers. Show all posts
Showing posts with label programmers. Show all posts
Monday, April 8, 2013
Octave, graphs and signals
sig1= [2 1 2 1 1 2 1 1 1 2 1 1 2 1 2 1]
a=length(sig1)
stem(sig1, '*')
axis([0 a 0 3])
grid on
Playing with octave again. Paste the code ointo octave and it will produce a graph showing the points.
- wong chee tat :)
Saturday, August 15, 2009
Project Updates / Status
It is quite some time I gave an update on the project. Over the vacations, I had done some work on some of the topics. I will summarized them here.
1) Understanding low work functions on FE. It is known that the material work function is very dependent on the FN theory. However, to be more efficient and use less power, having a low work function material for field emission seems to be a good idea. There are already some research on going in this area, however, most of them lack finer details that I need.
Initial results from simulations (2-3eV) seems in line with typical results (my working model as well as from the articles).
When the work function is made to be lower (< 1eV), on the first look, it follows the typical results. But on closer examination, it doesn't seemed to be so.
2) Tracking electron trajectories follows the classical laws of Physics.
Found some old sources and they revealed interesting behavior. Tempted to write for relativistic regimes but I better not to so.
3) Compiling xoopic doesn't seem to work. I got interested after reading Koh's thesis and from other articles especially from Journal of Applied Physics, but the package were dated in 2002. Searched and tested for the latest 2009 version produces lots of funny error messages. Note: Not a standard package.
4) Report writing
5) Planned for simulating for 2nd model using Zuber, etc. The program (2nd model)already completed and working in just a few days after the last paper.
I did not explore further into the space charge analysis and study the FE behavior due to lack of time. Anyway ,adding the model along with the results would bloat the report!
- wong chee tat :)
1) Understanding low work functions on FE. It is known that the material work function is very dependent on the FN theory. However, to be more efficient and use less power, having a low work function material for field emission seems to be a good idea. There are already some research on going in this area, however, most of them lack finer details that I need.
Initial results from simulations (2-3eV) seems in line with typical results (my working model as well as from the articles).
When the work function is made to be lower (< 1eV), on the first look, it follows the typical results. But on closer examination, it doesn't seemed to be so.
2) Tracking electron trajectories follows the classical laws of Physics.
Found some old sources and they revealed interesting behavior. Tempted to write for relativistic regimes but I better not to so.
3) Compiling xoopic doesn't seem to work. I got interested after reading Koh's thesis and from other articles especially from Journal of Applied Physics, but the package were dated in 2002. Searched and tested for the latest 2009 version produces lots of funny error messages. Note: Not a standard package.
4) Report writing
5) Planned for simulating for 2nd model using Zuber, etc. The program (2nd model)already completed and working in just a few days after the last paper.
I did not explore further into the space charge analysis and study the FE behavior due to lack of time. Anyway ,adding the model along with the results would bloat the report!
- wong chee tat :)
Tuesday, June 30, 2009
Project Updates / Status
It is quite some time that I provide some updates about the project. In the last post, I mentioned that I am working on particle trajectories due to the field emission caused by different current regime.
At the first look, the problem seems to be quite difficult. But is it that hard? To track the particle trajectories, understanding Newtonian physics or classical physics is needed and apply the equations of motions to the problem would solve it.
Now, let's us stop and think about the problem.
But is simply applying the equations using classical mechanics valid at high electric fields? If not, how can we modify to make them valid at space charge conditions?
- wong chee tat :)
At the first look, the problem seems to be quite difficult. But is it that hard? To track the particle trajectories, understanding Newtonian physics or classical physics is needed and apply the equations of motions to the problem would solve it.
Now, let's us stop and think about the problem.
But is simply applying the equations using classical mechanics valid at high electric fields? If not, how can we modify to make them valid at space charge conditions?
- wong chee tat :)
Sunday, May 3, 2009
How to hide Thinking at Work so that the Non-Programmers don’t suspect Slacking?
How to hide Thinking at Work so that the Non-Programmers don’t suspect Slacking?
I was reading and searching some research papers and I came across this (as above). What do you think?
- wong chee tat :)
I was reading and searching some research papers and I came across this (as above). What do you think?
- wong chee tat :)
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