network profile
| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 6 months |
| seen | May 16 at 13:24 | |
| stats | profile views | 29 |
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May 12 |
asked | What's the physical significance of using fourier transform for diffraction? |
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May 5 |
comment |
Phasor representation of voltage in frequency domain I got it. Thanks. |
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May 5 |
accepted | Phasor representation of voltage in frequency domain |
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May 5 |
comment |
Phasor representation of voltage in frequency domain Thanks. So the phase shift will be reflected in $V^+$ and $V^-$ instead of $\beta x$? |
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May 5 |
asked | Phasor representation of voltage in frequency domain |
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May 3 |
revised |
reflected wave in the transmission line added 132 characters in body |
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May 3 |
asked | reflected wave in the transmission line |
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May 3 |
accepted | How we approach RLC circult from RLGC model? |
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May 3 |
comment |
How we approach RLC circult from RLGC model? Ok. I think I get the point now. But I still have one question. If we separate the transmission line into infinite number of sections, why we assume in each section, the R, L, G, C are constant and same for each section? |
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May 3 |
comment |
How we approach RLC circult from RLGC model? What I mean is if I only show the equivalent circuit as in the question but didn't tell that it is the simplified model for a transmission line. So how can you tell the difference? Note that to get the impedance for RLGC model, the only math we use is the loop and junction law, so the result of RLGC model should be able to reduced RLC circuit if we remove the G term. |
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May 3 |
comment |
How we approach RLC circult from RLGC model? But what happen if the transmission light is so uniform and short so we only have one section, then the RLGC model is just a model of RLC in series and with one G connected to C in parallel. Also, RLGC is just a mathematical model, why it fail to reduce to RLC circuit? |
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May 2 |
asked | How we approach RLC circult from RLGC model? |
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Apr 28 |
comment |
How to understand the thermal radiation? It is confusing about the emissivity because my text "Physics for scientists and engineers" state that "the emissivity is equal to the absorptivity" |
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Apr 28 |
comment |
How to understand the thermal radiation? Sorry for the typo. It should be: what's the energy transferred from the sun and reach an ice with area A and height H on the ground of the earth. So to my understanding your reply, if the energy per meter^2 from the sun is E, the actual energy research the ice should be E*A*0.05 (0.05 is the emissivity same as absorptivity), is that correct? |
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Apr 28 |
comment |
How to understand the thermal radiation? Thanks. I read the wiki also. But I still don't understand how to estimate the radiating energy reach an object. There is a question in the text read: what's the energy from run and reach an ice (with emissivity about 0.050) on earth? This is pretty confusing because I think the energy from sun only depends on the emissivity of the sun and the temperature but in this question, it looks like I have to use the emissivity of the ice to calculate that energy, why? |
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Apr 28 |
asked | How to understand the thermal radiation? |
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Apr 23 |
asked | Why frequency and tension doesn't change in the two medium? |
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Apr 22 |
accepted | What's the motion of this yoyo under external force will be? |
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Apr 16 |
asked | what's the difference between linear n-atom molecule and nonlinear n-atom molecule? |
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Apr 14 |
asked | What's the motion of this yoyo under external force will be? |
