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6
votes
1answer
1k views
LED Thermal Modeling (How to solve heat equation with constant heat source)
I have a mechanical design with LEDs that generate heat. I want to estimate the temperature at the LED junction vs. time, but especially at steady state.
Knowing the LED voltage drop and current, I ...
3
votes
1answer
89 views
Are there microscopic theories, which work, but which wrongly predict macroscopic behaviour?
Motivated by this question (and the P. W. Anderson article linked in that question, which I came across here somewhere today and just read) I wonder about something, which is somewhat bordering an ...
4
votes
0answers
328 views
Is there any simple quantum model by Gerard 't Hooft which can explain the double slit experiment?
This question is directed to Prof. 't Hooft and anybody who is familiar with his papers. It is a reaction to Prof. 't Hooft's question why nobody is excited about his classical models for quantum ...
4
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0answers
356 views
Interpretation of Stiffness Matrix and Mass Matrix in Finite Element Method
I would like to have a general interpretation of the coefficients of the stiffness matrix that appears in FEM. For instance if we are solving a linear elasticity problem and we modelize the relation ...
3
votes
0answers
176 views
Simple model of the solar system. Parameters? Accuracy?
I was thinking of making a simple 2D model of the solar system, with planets moving along ellipses like
$$x(t) = k_x \sin(t + k_t) (\sin(k_\phi) + \cos(k_\phi))$$
$$y(t) = k_y \cos(t + k_t) ...
2
votes
0answers
105 views
Turboshaft Turbine Mathematical Model
Are there any simplified mathematical models for how two gas coupled turbines (also called a free power turbine) should interact with one another as the speed of the driving turbine changes.
(i.e.) ...
2
votes
0answers
63 views
Elimination of the node
Recently I have been reading a lot of astronomy papers on reductions in models of the solar system. A reoccurring concept is the elimination of the node. However, they never explain what the node is ...
1
vote
0answers
32 views
is log-Laplace ever an optimal model for physical phenomena?
In the financial world, the log-Laplace distribution almost perfectly models many phenomena such as price changes.
Does this model best fit any physical phenomena?
1
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0answers
47 views
Modeling the probability of a photodiode measuring photons targets at a neighbor
In current digital cameras, sensors are arrays of photodiodes which "transform" photons energy to electrons. I am aware that the probability of a photon to generate an electron is modeled by a Poisson ...
0
votes
0answers
48 views
What's the physical interpretation of constants in Laplace equation and diffusion equation?
What's the physical interpretation of constants in wave equation and diffusion equation?
$$u_{tt}=c^2u_{xx},$$
$$u_{t}=ku_{xx}.$$
Please introduce some reference about mathematical modeling of ...
0
votes
0answers
74 views
References for circular restricted 3 body problem?
Does anyone know of any good references for the CR3BP -- the circular restricted 3 body problem? Emphasizing on real-life applications, and interpretation of the numerical solutions? Thank you. There ...
