# Tagged Questions

DO NOT USE THIS TAG just because the question contains a differential equation!

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### Calculation of temperature distribution in bulk glass due to laser heating

I'm trying to figure out how to simplify the problem where laser pulses are focused to a small spot in bulk glass. The waist of the beam is about 20 microns. At the wavelength used there is only two-...
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### Electrical engineering math problem [closed]

I don't now, how to start or to proceed, help is valueable: Uin(t)=RIin'(t)+LI''in(t)+(1/C)*Iin(t) I(t)=Q'(t) Iin(0)=I_0 Iin'(0)=I'_0 Question: find an expression for $\text{I}_{\text{in}}(t)$ ...
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### a/x^2 + bdx^2 analytical solution [migrated]

I have this physics problem I'm trying to solve and its been a while since I've done differential equautions. The problem I'm trying to solve is : ...
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### Harmonic motion equation - non-null right hand side

Considering the following motion equation : $$\ddot x + \frac{a^2 b^2}{c^2} x = -V \frac{a b}{c^2}$$ where $a$, $b$, $c$ and $V$ are all constant. One can identify the ...
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### Stability of fix-point of a system of 3 non linear first order ODE, when one of the eigenvalues of Jacobian is zero

I have been working on a mean-field solution for am open quantum system model, to compare with the numerical solution of the exact solution. I have solved the system for steady state, but am now ...
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### Are all diffusion-like processes described as wave-like in relativity-compatible formulations?

Citing from Wikipedia's article on relativistic heat conduction: For most of the last century, it was recognized that Fourier equation (and its more general Fick's law of diffusion) is in ...
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### Contradictory argument to continous energy spectrum in quantum mechanics

The Schrodinger equation can be formulated as a regular Sturm-Liouville problem along with proper boundary conditions. Now the solution of regular Sturm Liouville problems with suitable boundary ...
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### $Ae^{\mathrm{i}\omega t}$ assumption for oscillating systems (formal & intuitive)

When we obtain a system of ODE's for $n$ masses connected with springs (or otherwise obtained by small amplitudes approximation), the next steps are usually assuming a solution in form \$Ae^{i\omega ...
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### IBP Identities to solve differential equation

I am wondering if anyone has experience in using IBP( Integration by parts) identities in the evaluation of Feynman diagrams via differential equations? My question is that I can't seem to understand ...