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bio website sjbyrnes.com
location Massachusetts
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Nov
12
answered Holes in a P-type semiconductor under external force E
Nov
11
awarded  Nice Answer
Nov
9
answered What electric field vector should I use for modeling unpolarized light?
Nov
7
revised Could the speed of light change outside our solar system
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Nov
6
comment Could the speed of light change outside our solar system
If you draw a line from earth to the "edge of the solar system" surface, the line hits the surface "near" normal (90 degrees), I agree. But exactly how "near" is it to 90 degrees? Not near enough! Remember, the refractive index change in the "sunset effect" (earth's atmosphere) is 1:1.0003. You're talking about a change that's a billion times larger, 1:1000000. Even if the angle is 89.999 degrees, the distortion would be glaringly obvious.
Nov
6
awarded  Popular Question
Nov
6
comment Could the speed of light change outside our solar system
Sure ... en.wikipedia.org/wiki/Atmospheric_refraction says that there's a 1 arc-minute shift at 45 degrees from zenith. 1 arc-minute is very very obvious with modern scientific equipment. If it was closer to zenith, the shift would be proportionally smaller.
Nov
6
comment Could the speed of light change outside our solar system
No, it does not "remove the effect", it weakens the effect. When the sun is EXACTLY at zenith, there is no sunset effect, but at any other angle, there is an effect, and the effect gets bigger as the sun gets farther away from zenith. We have quite precise telescopes, which could easily measure the sunset effect even if the sun was only slightly away from the zenith. And, we're viewing the sun through a refractive-index change of 1.0003 versus 1 ... you're talking about a refractive index contrast that is a billion times larger, and therefore a billion times easier to see.
Nov
5
answered Could the speed of light change outside our solar system
Oct
25
revised Domain of validity for semiconductor equations
added 289 characters in body
Oct
25
answered Domain of validity for semiconductor equations
Oct
23
revised Determining if a semiconductor is n-type, p-type or intrinsic
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Oct
23
answered Determining if a semiconductor is n-type, p-type or intrinsic
Oct
16
answered For semi-insulating GaAs is the bandgap bigger or smaller than the pure GaAs?
Oct
14
comment Why would mode-hopping occur as the current is changed?
@user6972 -- No. The material's temperature affects the mode everywhere that there is light in the mode. So temperature profile matters -- temperature as a function of x, y, z. In principle, you can stabilize the temperature of one particular point $(x_0, y_0, z_0)$ as current is changed, by adjusting the temperature controller as a function of current. But even if you do that perfectly, you'll find that the temperature at other points $(x_1, y_1, z_1)$ in the laser is not stable as the current is changed.
Oct
12
answered Why would mode-hopping occur as the current is changed?
Oct
8
comment Magnetic monopoles in spin ice and Dirac string comparison
Well, I wouldn't call it "genius", because it's somewhat natural and justifiable. If the term "magnetic monopole" wasn't already taken, it would have been an obvious and appropriate phrase to use. But the term was already taken! It's analogous to if you found an unusually heat-conductive material and called it "super-conductivity". Or if you found some weird new phenomenon related to electron spins in iron heterostructures, and you called it "ferro-magnetism". Or if you start a company writing microwave software and call it "microsoft".
Oct
6
answered Magnetic monopoles in spin ice and Dirac string comparison
Oct
5
comment Does serving food on a hot plate really keep it warm longer?
It also depends on the heat capacity of the plate and food. A thick heavy plate may help keep a small amount of food warm. For a flimsy little plate holding a ton of food, the initial plate temperature makes little difference.
Oct
4
revised Is “detailed balance” equivalent with a continuity equation in state space?
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