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| bio | website | en.wikipedia.org/wiki/… |
|---|---|---|
| location | United States | |
| age | 68 | |
| visits | member for | 1 year, 8 months |
| seen | 15 hours ago | |
| stats | profile views | 417 |
BS Mechanical Engr.
PhD CS(AI)
CS Prof (4yr)
Numerous consulting jobs.
15 yr at http://www.pharsight.com
Published book on CS & several articles
4 kids, 2 grand
Pilot(student)
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Nov 9 |
suggested | suggested edit on Why is energy in a wave proportional to amplitude squared |
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Nov 9 |
answered | Why is energy in a wave proportional to amplitude squared |
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Nov 8 |
comment |
Why does it seem like a broken magnet's poles flip? Are you sure that's what happened? |
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Nov 7 |
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Can physics shed light on religion and theology? As @Ron said, it depends on what constitutes religion. I've heard of highly-qualified scientists who see no conflict with science. My personal perception is that this is because they look at religion as being less about knowledge and more about mystery, i.e. it's got more in common with poetry and community than with facts. (I guess I could get sat on for saying that.) |
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Nov 7 |
comment |
Is it only red, green and blue that can make up any color through additive mixture? @MSalters: You're right. I was trying to think of a single wavelength. I guess what you're saying is there is no monochromatic magenta. Thanks. |
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Nov 7 |
revised |
Is it only red, green and blue that can make up any color through additive mixture? edited body |
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Nov 7 |
answered | Is it only red, green and blue that can make up any color through additive mixture? |
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Nov 6 |
revised |
Applications of recoil principle in classical physics added 110 characters in body |
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Nov 6 |
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Applications of recoil principle in classical physics @Ron: I sometimes suspect somebody's following me around and downvoting too. On the bright side, it means somebody's paying attention! |
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Nov 6 |
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If a vehicle is rolling down a hill, will its speed depend on the size of the wheel? @Georg: I agree, but if someone is facing the practical engineering problem of choosing a wheel size, they can't ignore it, and the OP did want practical information. I'm just thinking of an extreme situation of a bicycle riding over rough terrain. If the wheels were small they would get stuck in every little bump. |
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Nov 6 |
revised |
If a vehicle is rolling down a hill, will its speed depend on the size of the wheel? added 358 characters in body |
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Nov 6 |
revised |
If a vehicle is rolling down a hill, will its speed depend on the size of the wheel? added 138 characters in body |
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Nov 6 |
answered | If a vehicle is rolling down a hill, will its speed depend on the size of the wheel? |
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Nov 6 |
revised |
Applications of recoil principle in classical physics added 32 characters in body |
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Nov 6 |
revised |
Applications of recoil principle in classical physics added 572 characters in body |
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Nov 6 |
answered | Applications of recoil principle in classical physics |
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Nov 5 |
comment |
The amount of energy required to break the Coulomb Barrier As @RonMaimon points out here while normal chemical interactions with valence electrons couldn't have that kind of energy, inner-shell electrons could. |
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Nov 3 |
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Why don't experimental physics groups have statisticians in it? @Ron: Yeah, that falls under the general terms of "code generation" and "domain specific languages", which I very much encourage, though people get carried away in generalizing. It's a case of "partial evaluation", which is a useful concept, except it's been given the usual academic treatment of being way over-generalized to the point of uselessness. |
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Nov 3 |
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Why don't experimental physics groups have statisticians in it? @Ron: Not to belabor, but even on scientific code, I often find time on stuff not really necessary. Ex: LAPACK routines have character arguments to customize them, & can spend a large fraction of time calling a function to test those args. If you know that, you can do something about it, but only a line-percent-reporting stack sampler like Zoom will tell you that. Ex: large % of time in functions like exp and log where arguments haven't changed. Measurement doesn't tell you that you need to memoize those. You only say "Oh, well, that's just what it is." |
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Nov 3 |
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Why don't experimental physics groups have statisticians in it? @Ron: The problem with profilers is the speedups you don't get with them. Here is a list of the issues. Here's an example of a 43x speedup no profiler would have helped to achieve. Profiler-builders see measurement as the goal, assuming all speedup opportunities can be found by measuring. That's the flawed assumption, and any you don't find end up being the speed limit. |
