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Converting order parameter to director (nematics)

If I have a differential equation for the order parameter of a uniaxial nematic, like $\frac{\partial S_{\alpha \beta}}{\partial t} = f(S_{\alpha \beta})$, for $S_{\alpha \beta} = S(n_{\alpha}n_{\beta}...
user12614190's user avatar
1 vote
1 answer
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Using Persistence length to establish straightness of position data

In the following picture I am showing 3D position data for 4 different tracks just to illustrate how the tracks looks like. As we can see that we have all kind of behaviors occurring from helical ...
Junaid Mehmood's user avatar
1 vote
1 answer
84 views

Text Recommendation: Random Walks (for physicists)

I am an incoming graduate student in Theoretical Physics in the Netherlands, and I would like to know if any of you could recommend texts on random walks with applications to physics. My university ...
1 vote
1 answer
1k views

Derivation of the upper convected time derivative

I read on wikipedia theat the upper convected time derivatvie is the rate of change of some tensor property of a small parcelof fluid that is written in the coordinate system rotating and stretching ...
J.A's user avatar
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Does crosslinking a polymer film increase the stress within the film?

If I crosslink a polymer film, does that increase the internal stress of the film? Intuitively I think it should for entropy reasons; chains with greater links are more restricted and have a smaller ...
user668074's user avatar