#activematter — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #activematter, aggregated by home.social.
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Schooling at Scale
Relatively simple visual and hydrodynamic signals are enough to make digital fish school in ways that resemble living ones. Here, researchers look at what happens when well-behaved schools of fish get too big. The researchers first demonstrate that their schools behave reasonably at one hundred members, either in a schooling configuration or a group milling around a central region.
At one thousand fish, the schools are still reasonably coherent and sensible. But at fifty thousand fish, the picture is drastically different. Neither schooling nor milling groups are able to remain together. They fracture and scatter into smaller groupings. (Video and image credit: H. Hang et al.)
#2025gofm #activeMatter #biology #collectiveMotion #fish #fluidDynamics #instability #numericalSimulation #physics #schooling #science -
Fluid Flows Break Up Microswimmer Clumps
The field of active matter looks at the collective motion of particles and organisms–how birds flock and fish school. In systems of “dry” squirmers–those that have no hydrodynamic interactions with one another–clumps of squirmers can form with empty spaces in between them. This is known as motility-induced phase separation, or MIPS. Researchers wondered whether microswimmers in a fluid–which do produce hydrodynamic forces that can affect one another–would also show MIPS.
In a new study, researchers show, instead, that hydrodynamic interactions between swimmers will prevent (or destroy) these clumps. Through a combination of theoretical work and simulation, the authors found that translational flows between swimmers swept the swimmers out of clumps as they formed. Rotational flows between swimmers made them able to change direction faster, which also kept stable clumps from forming. (Image and research credit: T. Zhou and J. Brady; via APS)
Hydrodynamic interactions destroy clumps of microswimmers. This simulation shows microswimmers that are initially in a clumped formation before hydrodynamic interactions are “turned on”. Once the swimmers can affect one another through the flows their motion creates, the clumps quickly break apart. #activeMatter #biology #collectiveMotion #fluidDynamics #hydrodynamics #microswimmers #phaseSeparation #physics #science -
Aktualizacja Gigastructure w #ActiveMatter dodaje nowe lokacje, tryb Hired Ops oraz świeży arsenał broni. Rozgrywka staje się bardziej wymagająca dzięki zmianom w systemie permadeath i większej personalizacji.
https://cat5.pl/active-matter-rozszerza-sie-o-gigastructure/
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L'update "Gigastructure" per Active Matter aggiunge mappe, armi, mostri e modalità PvP. Attenzione alla permadeath: ora causa la perdita completa dei progressi. #GiochiPC #GiochiPS5 #GiochiSwitch #GiochiXbox #Notizievideogiochi #gamingnews #Videogiochi #ActiveMatter
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🚨Fully funded PhD opportunity: Physics, biology & ecology of toxic dinoflagellate blooms 🦠.
Supervisory team from Newcastle university (main supervisors), the University of Stirling and Lancaster University.
Join us to investigate how swimming motility and the flexible utilisation of energy sources influence bloom formation, using experiment🔬and modelling ♾️. #microswimmers #plankton #biophysics #biology #ecology #ActiveMatter #PhD
Please repost
Project details: https://iapetus.ac.uk/studentships/physics-biology-and-ecology-of-toxic-plankton-blooms/
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🎮 #ActiveMatter, nowa strzelanka online od Gaijin Entertainment i Matter Team, oferuje rajdy PvPvE, PvE, tryb PvP oraz bogaty arsenał.
https://cat5.pl/active-matter-hardkorowy-shooter-juz-dostepny
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Active Matter: Early Access des Extraction-Shooters startet im September https://www.computerbase.de/news/gaming/active-matter-early-access-des-extraction-shooters-startet-im-september.94033/ #activematter
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Gra #ActiveMatter wystartuje z zamkniętymi testami już we wrześniu. Na graczy czeka całkiem solidna ilość aktywności.
https://cat5.pl/zamkniete-testy-active-matter-wystartuja-9-wrzesnia
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Crowd Vortices
The Feast of San Fermín in Pamplona, Spain draws crowds of thousands. Scientists recently published an analysis of the crowd motion in these dense gatherings. The team filmed the crowds at the festival from balconies overlooking the plaza in 2019, 2022, 2023, and 2024. Analyzing the footage, they discovered that at crowd densities above 4 people per square meter, the crowd begins to move in almost imperceptible eddies. In the animation below, lines trace out the path followed by single individuals in the crowd, showing the underlying “vortex.” At the plaza’s highest density — 9 people per square meter — one rotation of the vortex took about 18 seconds.
The team found similar patterns in footage of the crowd at the 2010 Love Parade disaster, in which 21 people died. These patterns aren’t themselves an indicator of an unsafe crowd — none of the studied Pamplona crowds had a problem — but understanding the underlying dynamics should help planners recognize and prevent dangerous crowd behaviors before the start of a stampede. (Image credit: still – San Fermín, animation – Bartolo Lab; research credit: F. Gu et al.; via Nature)
#activeMatter #collectiveMotion #crowds #fluidDynamics #physics #science #vortices
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Strata of Starlings
Starlings come together in groups of up to thousands of birds for the protection of numbers. These flocks form spellbinding, undulating masses known as murmurations, where the movement of individual starlings sends waves spreading from neighbor to neighbor through the group. One bird’s effort to dodge a hawk triggers a giant, spreading ripple in the flock.
To capture the flowing nature of the murmuration, photographer and scientist Kathryn Cooper layers multiple images of the starlings atop one another. The birds themselves become pathlines marking the murmuration’s motion. The final images are surprisingly varied in form. Some flocks resemble a downpour of rain; others the dangling branches of a tree. (Image credit: K. Cooper; via Colossal)
#activeMatter #biology #birds #collectiveMotion #flocking #flowVisualization #fluidDynamics #fluidsAsArt #murmuration #physics #science
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Our article on the #mechanics of "active" entropic biopolymer networks [possibly including #actomyosin, this is debated experimentally] is now published in J Elas.
Compared to enthalpic models, we're able to go right from the #thermodynamics of an unbiased #molecularMotor activity (in the spirit of the model by #JacquesProst for #myosin) at the molecular scale to a network-scale model in a closed form.
And we derive a method for solving quite easily the (usually tough) #viscoelastic #liquid model that we obtain, using #deformationGradientDecomposition.
https://doi.org/10.1007/s10659-024-10102-8
(I share a paywall-free link to my followers below, but it's also on arXiv: https://arxiv.org/abs/2405.07287 and on my webpage https://liphy-annuaire.univ-grenoble-alpes.fr/pages_personnelles/jocelyn_etienne/papers.html#Jallon+Etienne.2025.1)#cytoskeleton #cell #tissue #morphogenesis #activeMatter #livingMatter
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Our #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure from the thermodynamic constraints on the dynamics of #myosin molecular motors is now updated!
Hopefully more readable, and with the example of a #cyst like contractile sphere.
#cytoskeleton #rheology #activeMatter #softMatter #actomyosin
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Active Matter is a PvPvE ‘mind-bending tactical hardcore shooter’ heading for closed beta by year’s end
🔗 https://massivelyop.com/2024/10/31/active-matter-is-a-pvpve-mind-bending-tactical-hardcore-shooter-heading-for-closed-beta-by-years-end
#ActiveMatter -
Anunciado Active Matter, un FPS ambientado en un multiverso fracturado https://www.dekazeta.net/anunciado-active-matter-un-fps-ambientado-en-un-multiverso-fracturado/
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Hydrogels can learn to play Pong - This electroactive polymer hydrogel "learned" to play Pong. Credit: ... - https://arstechnica.com/?p=2044726 #materialsscience #smartmaterials #activematter #chemistry #hydrogels #polymers #science #physics #pong
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Active nematic fluids borrow their ingredients from biology. Using long, rigid microtubules and kinesin motor proteins capable of cross-linking between and “walking” along tubules, researchers create these complex flow patterns. Here, a team took the system a step further by seeding the flow with a hydrogel that turns into a polymer when exposed to light. Then, by shining light patterns on the flow, the scientists can create rigid or flexible structures inside the active fluid. In this case, they show off some of the neat flow patterns they can create. (Video and image credit: G. Pau et al.)
https://fyfluiddynamics.com/2024/06/growing-hydrogels-in-an-active-fluid/
#2024gosm #activeMatter #activeNematicFluid #fluidDynamics #hydrogel #physics #polymerEffects #science
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A new #preprint where we derive an #activeGel #model with entropic elasticity of the #microstructure and give interpretations of the thermodynamic constraints on the dynamics of #myosin molecular motors.
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Annual European Rheology Conference 2024 takes place at the University of #Leeds, UK from 9th-12th April 2024.
*deadline 15/12 for abstracts*
#Colloids & Glasses
#Polymeric Fluids
#Emulsions, #Foams and #Interfacial #Rheology
#Microrheology #microfluidics
#rheometry
#Suspensions #Granular Materials
#Food Rheology
#NonNewtonian #Fluids #Instabilities
#additiveManufacturing
#BioRheology #ActiveMatter
#GeoRheology
#SoftSolids #Viscoplasticity -
New paper from Devereux and Turner on Environmental Path-Entropy and Collective Motion
https://doi.org/10.1103/PhysRevLett.130.168201
#swarming #flocking #physics #scienceMastodon #ActiveMatter #CollectiveBehavior
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We have never thought #physics lectures could be that beautiful from a purely visual point of view🤩
Learn about #ActiveMatter and its applications from Prof. Julia Yeomans, #Oxford. Don't miss the chance to virtually join the Nordita #PhD #School and discuss the course with its author & others at https://enabla.com/set/143
Our lectures are #free and #OpenAccess; the easiest way for you to support our project is to share this post, follow our account, and ask a few questions on Enabla. Thank you!🙏
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#MorphologicalComputation for #SwarmEngineering of #ActiveMatter.
"building upon the recent theoretical progress made in describing the population of active particles, one can envision a rapid development of a statistical mechanics description of smart active matter for future swarm engineering."
https://www.science.org/doi/10.1126/scirobotics.abo6140 -
Fire ant rafts form because of the Cheerios effect, study concludes - Enlarge / Georgia Tech scientists found that the so-called "Cheerios ef... - https://arstechnica.com/?p=1881039 #collectivebehavior #phasetransitions #activematter #fireants #science #biology #physics
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Three days of work, the first step of a new project. Happy 😊.
#activematter #molecularmotor #simulation #Julialang