Caltech scientists have found a fast and efficient way to add up large numbers of Feynman diagrams, the simple drawings ...

This article investigates the relationship between particle size, true density, and the compressive strength of hollow glass microspheres (HGMs). Using the Bettersizer 2600 laser diffraction particle ...

By allowing the grains to settle in liquids of varying density, the speed of the particles can be varied and a systematic exploration of the jamming phase diagram can be made.

Diagrams with no loops have amplitudes of weight 0; the amplitudes of diagrams with one loop are all periods of mixed Tate motives and have, at most, a weight of 4.

It can be impossible to identify full virus particles from empty ones based on size or shape alone. The particle's buoyant density can help you to distinguish between otherwise identical populations.