Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Local boundary conditions for NMR-relaxation in digitized porous media   We narrow the gap between simulations of nuclear magnetic resonance dynamics
on digital domains (such as CT-images) and measurements in D-dimensional porous
media. We point out with two basic domains, the ball and the cube in D
dimensions, that due to a digital uncertainty in representing the real pore
surfaces of dimension D-1, there is a systematic error in simulated dynamics.
We then reduce this error by introducing local Robin boundary conditions.

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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: stat
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg