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sabato 6 marzo 2021
# gst: the dynamics of a collective bubble (in a foam) that collapse in a droplet
martedì 14 novembre 2017
# gst: a striking analogy between solid–solid and solid–drop frictions
AA << report that the lateral adhesion force between a liquid drop and a solid can also be divided into a static and a kinetic regime. This striking analogy with solid–solid friction is a generic phenomenon that holds for liquids of different polarities and surface tensions on smooth, rough and structured surfaces >>
Nan Gao, Florian Geyer, et al. How drops start sliding over solid surfaces. Nature Physics doi: 10.1038/nphys4305 Nov 6, 2017
https://www.nature.com/articles/nphys4305
AA << acknowledges that their experiments are just the beginning in trying to fully understand the nature of friction between drops and solid objects >>
Bob Yirka. Droplet friction found to be similar to that of solid objects. Nov 8, 2017
https://m.phys.org/news/2017-11-droplet-friction-similar-solid.html
giovedì 15 febbraio 2024
# gst: droplets scoot like caterpillars.
venerdì 26 gennaio 2024
# gst: compression and fracture of ordered and disordered droplet rafts
mercoledì 10 maggio 2023
# gst: to find a separation between plunging and spilling wave breakers
martedì 30 luglio 2019
# chem: acoustic levitation techniques to perform chemistry in floating droplets
<< Beauchamp (Jack Beauchamp) is doing work in what he calls "lab-in-a-drop" chemistry, in which chemical reactions are performed within a drop of liquid suspended in midair through acoustic levitation. >>
Performing chemistry in floating droplets. California Institute of Technology. Jul 29, 2019.
https://m.phys.org/news/2019-07-chemistry-droplets.html
Chaonan Mu, Jie Wang, et al. Mass Spectrometric Study of Acoustically Levitated Droplets Illuminates Molecular‐Level Mechanism of Photodynamic Therapy for Cancer involving Lipid Oxidation. Angewandte Chemie International Edition. Volume 58, Issue 24. doi: 10.1002/anie.201902815. Apr 23, 2019.
https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201902815
sabato 25 settembre 2021
# gst: ️apropos of spontaneous active matter, the active droploids.
venerdì 3 settembre 2021
# gst: apropos of transitions, when a liquid droplet takes a turn (as a swimming behavior of amoebas)
venerdì 4 agosto 2023
# gst: dynamics and interactions of multiple bright droplets and bubbles, and interactions of kinks with droplets and with antikinks.
sabato 12 ottobre 2019
# gst: exploring the lifespan of a liquid droplet
<< Current theories state that the droplet's diameter-squared decreases in proportion to time (classical law); however, this period only accounts for a small portion of the drop's evolution. As the diameter approaches the unobservable micro- and nano-scale, molecular dynamics have to be used as virtual experiments and these show a crossover to a new behaviour, with the diameter now reducing in proportion to time (nano-scale law). >>
<< It is fascinating that intuition based on everyday observations are a hindrance when attempting to understand nanoscale flows, so that, as in this research, one has to lean on theory to enlighten us. >> James Sprittles.
The lifespan of an evaporating liquid drop. University of Warwick. Oct 10, 2019. https://m.phys.org/news/2019-10-lifespan-evaporating-liquid.html
Rana A.S., Lockerby D.A., Sprittles J.E. Lifetime of a Nanodroplet: Kinetic Effects and Regime Transitions. Phys. Rev. Lett. 123, 154501 Oct 9, 2019. https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.154501
lunedì 10 luglio 2023
# gst: myriad of complex dynamics from the atomization of acoustically levitated droplets
martedì 30 gennaio 2024
# gst: analogy between quasi-2D and 3D liquid drops.
sabato 22 aprile 2023
# gst: when droplets are capable of self-propulsion as if they were surfing on a self-generated wave.
domenica 9 dicembre 2018
# gst: fingerprints of reality: water drops that vibrate, flames that oscillate, and viscous fluids that form rivulets ...
<< In one of this year’s three winning videos, a drop of blue-dyed water at the bottom of an anise-oil and alcohol mixture begins to grow and shake, eventually pinching off a fragment that floats up. The process repeats several times. Created by now four-time Gallery-of-Fluid-Motion winner Oscar Enríquez of Carlos III University of Madrid and his colleagues, the visuals are accompanied by a soundtrack featuring a musical improvisation by a trio consisting of Enríquez on percussion, a violinist, and a clarinetist. Each instrument in the trio represents one of the three fluids. >>
Award-Winning Fluid Videos. APS. Physics 11, 121. Nov 21, 2018.
sabato 21 maggio 2022
# gst: apropos of transitions, two aspects of intermittency
sabato 30 ottobre 2021
# gst: apropos of transitions, perspectives on viscoelastic flow instabilities; the 'porous individualism'
martedì 9 maggio 2023
# life: exponential post-Donald (without Donald), how AI could interfere (drive) next political elections.
martedì 3 ottobre 2017
# behav: spreading conflicts through monkey societies
<< How does conflict spread through a society? One way to think of conflict spreading is to picture an epidemic, with aggressive individuals "infecting" others and causing them to join the fight >>
<< It appears that it is not individuals who control the length of fights, but the relationships between pairs of individuals >>
AA << found evidence for a more complicated structure behind >>
AA << found evidence that conflict duration is strongly affected by the first interaction, which sets the tone for the fight. If the first interaction is brief, then following episodes are likely to be just as brief. A long drawn out initial brawl, however, will be followed by similarly difficult episodes. This, Flack [Jessica Flack] says, "is a signature of collective memory," meaning "the duration of the conflict is not just determined by individuals independently deciding whether to continue fighting or drop out, but through their joint memory for the past and subsequent collective decision-making." >>
How conflicts spread through monkey societies. Sep 7, 2017
https://m.phys.org/news/2017-09-conflicts-monkey-societies.html
Edward D. Lee, Bryan C. Daniels, et al. Collective memory in primate conflict implied by temporal scaling collapse. Journal of the Royal Society Interface. doi: 10.1098/rsif.2017.0223 Sep 6 2017.
http://rsif.royalsocietypublishing.org/content/14/134/20170223
mercoledì 10 aprile 2024
# gst: exploring the on-demand dynamical generation of a plethora of dispersive shock waves arising in attractive one-dimensional droplet-bearing environment.
lunedì 25 marzo 2019
# gst: the auto assembly of a drop (from thermal capillary waves)
<< after single or multiple bridges form due to the presence of thermal capillary waves, the bridge growth commences in a thermal regime. Here, the bridges expand linearly in time much faster than the viscous-capillary speed due to collective molecular jumps near the bridge fronts. Transition to the classical hydrodynamic regime only occurs once the bridge radius exceeds a thermal length scale l_(T) ~ sqrt(Radius). >>
Sreehari Perumanath, Matthew K. Borg, et al. Droplet Coalescence is Initiated by Thermal Motion. Phys. Rev. Lett. 122, 104501 Mar 13, 2019.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.104501
Supercomputer sheds light on how droplets merge. University of Edinburgh. Mar 20, 2019.
https://m.phys.org/news/2019-03-supercomputer-droplets-merge.html