meta user
network profile
| bio | website | vyznev.net |
|---|---|---|
| location | Helsinki, Finland | |
| age | ||
| visits | member for | 1 year, 10 months |
| seen | 4 hours ago | |
| stats | profile views | 61 |
I like programming in Perl and C. I know Java and PHP too (I'm a MediaWiki developer), but I can't really say I like them. I keep meaning to learn Python some day, but never seem to get around to it.
I'm working on a Ph.D. in biomathematics. I also like programming puzzles and cryptography.
Please consider any (original) code I post to Stack Overflow (and other Stack Exchange sites) to be released under CC-Zero unless stated otherwise. You may do whatever you want with it and don't have to credit me in any way, although of course that would be nice.
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May 4 |
comment |
Will a helicoper which is hovering inside a closed box move with the box when we move it? +1 for "box affects air, air affects helicopter". (In fact, if we're being pedantic, even in your "extreme case" the supersonic shockwave will hit the helicopter slightly before the wall does.) |
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May 4 |
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Will a helicoper which is hovering inside a closed box move with the box when we move it? @BrandonEnright: ...or a fly in a car. |
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May 3 |
comment |
Monte Carlo for Random Bond Ising ferromagnet Not really an answer, just a suggestion, but if you're content to just sample one half of the bimodal ground state distribution and assume the other half to be identical by symmetry (which I agree is a good idea), then you might as well start with an initial state with already broken symmetry (e.g. the all down state). That way, you avoid having to spontaneously break the initial symmetry, which can be slow since the symmetry can locally break in different directions, leaving domain walls that can take time to disappear. I'll see if I can give a better answer after taking a look in Liggett. |
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May 1 |
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Does the unit of a quantity change if you take square root of it? @Vibert: I used gnuplot to draw them in SVG format, and then Inkscape to rasterize them to PNG (and for minor tweaks like the superscript ½). |
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May 1 |
comment |
Why are expressions such as $\operatorname{ln}T$ used in thermodynamics where $T$ is not dimensionless? Almost duplicate: physics.stackexchange.com/questions/13060/… |
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Apr 30 |
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Does the unit of a quantity change if you take square root of it? Yes. If the unit of $m$ is $\rm kg$, then the correct unit of $\sqrt m$ is $\rm kg^{\frac12}$. That's simply a fact, not a matter of choice. |
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Apr 30 |
revised |
Does the unit of a quantity change if you take square root of it? added 274 characters in body |
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Apr 30 |
answered | Does the unit of a quantity change if you take square root of it? |
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Apr 23 |
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Can vorticity be destroyed? It sounds like you've answered your own question. What, exactly, would you still like clarified? |
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Apr 21 |
answered | Is it possible that 5 planets can revolve around a single star in a single orbit? |
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Apr 21 |
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Two planets in same orbit - not planets? Ps. No on-line discussion of co-orbital satellites would be complete without a link to Bob Jenkins's Java applets. In particular, the "tag-team orbit" examples near the bottom of the page model pretty much this situation. |
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Apr 21 |
revised |
Two planets in same orbit - not planets? added 84 characters in body |
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Apr 21 |
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Two planets in same orbit - not planets? I'd consider Janus and Epimetheus to be a much better example; see my answer below. |
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Apr 21 |
answered | Two planets in same orbit - not planets? |
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Apr 1 |
revised |
Why doesn't fusion contradict the 1st law of thermodynamics? texify E=mc^2, correct what seems to be a typo ("is" -> "it") and expand ("it" -> "the question") |
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Apr 1 |
suggested | suggested edit on Why doesn't fusion contradict the 1st law of thermodynamics? |
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Mar 31 |
awarded | Nice Answer |
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Mar 31 |
comment |
Is Feynman's explanation of how the moon stays in orbit wrong? @mtanti: The tangential velocity stays constant, as you can see from the picture. As for why $v_1$ should depend on $a_1$, remember that the acceleration vector is changing continuously from $a_0$ to $a_1$ as the moon moves from $x_0$ to $x_1$. Taking the mean of $a_0$ and $a_1$ in the approximate formula for $v_1$ is just a linear approximation of this gradual change. |
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Mar 31 |
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Is Feynman's explanation of how the moon stays in orbit wrong? @becko: I drew it in GeoGebra. Here's the worksheet file, if you want to play with it. (Try dragging the $x_1$ point around!) |
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Mar 31 |
answered | Is Feynman's explanation of how the moon stays in orbit wrong? |
