In the "classical" network flow model, flows are constrained by the capacities of individual arcs. In the "polymatroidal" network flow model introduced in this paper, flows are constrained by the ...

Representing stream hyporheic-zone processes is a central challenge in extending stream network flow models to include biogeochemistry.

We develop practical operations research models to support decision making in the design and management of public bicycle-sharing systems. We develop a network flow model with proportionality ...

The effects of technological enhancements, such as automation and robotics, will also improve network flow outcomes to the extent possible given the model’s capacity for data inputs.

A new model based on the blood-vessel network in a rat brain shows that the vessel position within its circulatory network does not influence the blood flow nor how nutrients are transported.