In our theoretical analysis, a general conclusion is that optimal ground speeds for fish swimming against currents would increase with increasing current velocity.
This analysis shows that at any given head current velocity, a minimum energy expenditure per ground distance can be found, which indicates the optimal ground speed for that particular current velocity (Fig. 2).
This prediction is still used for estimating optimal ground speed in currents (e.g. [20]).
From these theoretical illustrations, we predict that optimal ground speed is not constant for varying head current velocities, but rather increases at a rate depending on the value of x.
Furthermore, energy use for keeping a certain ground speed increases with current velocity and optimal ground speed changes with increasing current velocity (Fig. 2).
In the months prior, dropping oil prices for Africa's second-largest crude exporter, Angola, ushered in cuts in public sanitation services; in turn, urban trash buildup created an optimal breeding ground for the mosquitoes.
The influx of fans fosters the optimal breeding ground for pimps looking to boost their profits.
Because hundreds of thousands of fans descend upon the Super Bowl host city, it becomes the optimal breeding ground for forced workers, Texas Attorney General Greg Abbott told USA Today back in 2011.
"EXTREMELY poor societies…provide optimal breeding grounds for disease, terrorism and conflict".
The cure, Barthes knew, can be found in the study of literature, photography, and other art forms, optimal training grounds for developing the kind of attention necessary to see what surrounds us.
