376 research outputs found
Origin of line tension for a Lennard-Jones nanodroplet
The existence and origin of line tension has remained controversial in
literature. To address this issue we compute the shape of Lennard-Jones
nanodrops using molecular dynamics and compare them to density functional
theory in the approximation of the sharp kink interface. We show that the
deviation from Young's law is very small and would correspond to a typical line
tension length scale (defined as line tension divided by surface tension)
similar to the molecular size and decreasing with Young's angle. We propose an
alternative interpretation based on the geometry of the interface at the
molecular scale
Multiple Model Predictive Control on a drainage canal system
Model Predictive Control has been implemented on a large drainage canal system in the Netherlands. This water system can be represented as a reservoir with uncertain inflow due to rainfall runoff and a water level that has to be kept within a certain range by a control flow that is limited in capacity. Tests demonstrate that Model Predictive Control outperforms feedback and feedforward controls. To deal with uncertainty in the expected inflow, Multiple Model Predictive Control (MMPC) is proposed. This controller minimizes an objective function in which the risk of damage is used by applying different scenarios to multiple identical models
Formation of surface nanobubbles and universality of their contact angles: A molecular dynamics approach
We study surface nanobubbles using molecular dynamics simulation of ternary
(gas, liquid, solid) systems of Lennard-Jones fluids. They form for
sufficiently low gas solubility in the liquid, i.e., for large relative gas
concentration. For strong enough gas-solid attraction, the surface nanobubble
is sitting on a gas layer, which forms in between the liquid and the solid.
This gas layer is the reason for the universality of the contact angle, which
we calculate from the microscopic parameters. Under the present equilibrium
conditions the nanobubbles dissolve within less of a microsecond, consistent
with the view that the experimentally found nanobubbles are stabilized by a
nonequilibrium mechanism.Comment: 5p,4
The effects of the PLAYTOD Program on children’s physical activity at preschool playgrounds in a deprived urban area:A randomized controlled trial
Liquid drops attract or repel by the inverted Cheerios effect
European Union Grant CIG 618335. S.K. acknowledges financial support from NWO through VIDI Grant 11304. A.P. and J.H.S. acknowledge financial support from European Research Council Consolidator Grant 616918
Levels of naturally produced methoxylated MeO-PBDEs and their biomagnification in harbour seals and harbour porpoises from the North Sea
Translating Behavior Change Principles Into a Blended Exercise Intervention for Older Adults: Design Study
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