But with smaller systems, the speakers are simply book - ended on the same shelf, or are actually connected to the unit itself. (styleathome.com)
However, in most situations occurring in nature particles interact with each other, which makes it challenging to understand and calculate the angular momentum properties even for small systems. (sciencedaily.com)
New techniques, however, are on the verge of accomplishing this in smaller systems. (simonsfoundation.org)