3 research outputs found
Phytoplankton temporal strategies increase entropy production in a marine food web model
We develop a trait-based model founded on the hypothesis that biological
systems evolve and organize to maximize entropy production by dissipating
chemical and electromagnetic potentials over longer time scales than abiotic
processes by implementing temporal strategies. A marine food web consisting of
phytoplankton, bacteria and consumer functional groups is used to explore how
temporal strategies, or the lack there of, change entropy production in a
shallow pond that receives a continuous flow of reduced organic carbon plus
inorganic nitrogen and illumination from solar radiation with diel and seasonal
dynamics. Results show that a temporal strategy that employs an explicit
circadian clock produces more entropy than a passive strategy that uses
internal carbon storage or a balanced growth strategy that requires
phytoplankton to grow with fixed stoichiometry. When the community is forced to
operate at high specific growth rates near 2 d-1, the optimization-guided model
selects for phytoplankton ecotypes that exhibit complementary for winter versus
summer environmental conditions to increase entropy production. We also present
a new type of trait-based modeling where trait values are determined by
maximizing entropy production rather than by random selection.Comment: 39 pp. including Supplementary Material, 6 Figure
The Character of Entropy Production in Rayleigh–Bénard Convection
In this study; the Rayleigh–Bénard convection model was established; and a great number of Bénard cells with different numbered vortexes were acquired by numerical simulation. Additionally; the Bénard cell with two vortexes; which appeared in the steady Bénard fluid with a different Rayleigh number (abbreviated Ra); was found to display the primary characteristics of the system’s entropy production. It was found that two entropy productions; which are calculated using either linear theory or classical thermodynamic theory; are all basically consistent when the system can form a steady Bénard flow in the proper range of the Rayleigh number’s parameters. Furthermore; in a steady Bénard flow; the entropy productions of the system increase alongside the Ra parameters. It was also found that the difference between the two entropy productions is the driving force to drive the system to a steady state. Otherwise; through the distribution of the local entropy production of the Bénard cell; two vortexes are clearly located where there is minimum local entropy production and in the borders around the cell’s areas of larger local entropy production