Dom @freeDomForTooting@qoto.org
- Pronouns
- he/him
Postgraduate researcher studying #CondensedMatter, in particular #SoftMatter, #ActiveMatter, #MolecularBiology, #CellBiology, #PhaseTransitions, and #ComplexSystems using the tools of #TheoreticalPhysics, #BioPhysics, #StatisticalPhysics, #FluidDynamics, #ComputationalPhysics, and #Simulation.
For instance, one of the projects I'm working on at the moment addresses #universality in active #turbulence with #spectral techniques. A related project predicts a new microphase separation regime in inhomogeneous active #nematics by simulating the coupled #CahnHilliard, #NavierStokes, and #BerisEdwards equations. Another project develops a #FieldTheory of the #orderphobic effect, a nonspecific interaction between #transmembrane bodies anchored in a #lipid #bilayer.
My other interests include #cycling, #ArchLinux, #Linux, #LibreSoftware, learning #Korean, #yoga, #calisthenics, #singing, #autonomy, #Cooperatives, #DeliberativeDemocracy, #CitizensAssemblies, #ParticipatoryDemocracy, #DemocraticInnovation, #OpenDemocracy, #LibertarianSocialism, #RightToRepair, #democracy, #humanism, #rationalism, #OpenScience, #science, #CommunityEmpowerment, #community, #commons, #research, #wikis, #governance.
Joined Nov 2022
Pinned toot
#SoftMatter have just published the results of a project that Renato Assante, Davide Marenduzzo, Alexander Morozov, and I recently worked on together! What did we do and what’s new? Briefly…
#Microswimmer suspensions behave in a similar way to fluids containing kinesin and microtubules. Both systems can be described by the same system of three coupled nonlinear #PDEs.
A #LinearStabilityAnalysis of these equations suggests that variations in concentration across the system don’t significantly affect emergent #phaseBehaviour. How then can we explain #experiments that show visible inhomogeneities in #microtubule–#kinesin mixtures, for instance?
With increasing activity, we move away from the quiescent regime, past the onset of #SpontaneousFlow, and deeper into the active phase, where #nonlinearities become more important. What role do concentration inhomogeneities play here?
We investigated these questions, taking advantage of the #openSource #Dedalus #spectral framework to simulate the full nonlinear time evolution. This led us to predict a #novel regime of #spontaneous #microphaseSeparation into active (nematically ordered) and passive domains.
Active flow arrests macrophase separation in this regime, counteracting domain coarsening due to thermodynamic coupling between active matter concentration and #nematic order. As a result, domains reach a characteristic size that decreases with increasing activity.
This regime is one part of the #PhaseDiagram we mapped out. Along with our other findings, you can read all about it here!
low #ReynoldsNumber #turbulence #ActiveTurbulence #CahnHilliard #ActiveMatter #NavierStokes #BerisEdwards #CondensedMatter #PhaseTransitions #TheoreticalPhysics #BioPhysics #StatisticalPhysics #FluidDynamics #ComputationalPhysics #Simulation #FieldTheory #paperthread #NewPaper #science #research #ActiveGel #activeNematic #analytic #cytoskeleton #hydrodynamics #MPI #theory
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This bit feels even more relevant for today’s #UCU #strike #ucuRISING
For many years, academics accepted relatively low pay (relative to their skill level) and long hours in exchange for relative #autonomy at work and a dignified retirement. That #socialContract has been torn up under a decade of #marketisation. The supply of “good will” (i.e. #underpaid and #unpaidLabour) that has kept #universities running for a long time is now close to zero. Even if the employers win in this dispute, it will be a #Phyrric victory, or a Carthaginian one — creating a desert and calling it peace. Unless vice-chancellors change course, #workplace relations will be poisoned for a generation and universities will become increasingly #dysfunctional.
The Seven Deadly Sins of Marketisation in British Higher Education by Lee Jones
Pinned toot
Solidarity with #UCU #strike today! (and tomorrow and next Wednesday) #ucuRISING #UCUstrikeback over unjustifiable pension cuts and the four fights: Working & Learning Conditions, Casualization & Precarity, Inequality, and Pay
Dom
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Ada Lovelace demonstrates that women are just as capable at excellence in computing as their male counterparts.
However, men are more likely to “feel they belong than women” (see link). And the share of bachelor’s degrees in computing awarded to women has halved since 1985.
Anecdotally, my female friends in computer science have experienced bullying & harassment, or been ignored & overlooked. /2
https://www.economist.com/graphic-detail/2018/10/22/why-the-future-isnt-female-in-computing
Dom
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Have we reached ‘peak meat’? Why one country is trying to limit its number of livestock - https://www.theguardian.com/environment/2023/jan/16/netherlands-european-union-regulations-livestock "Dutch government announced the first part of a €24.3bn ($26.3bn) plan to buy out up to 3,000 farms and major industrial polluters near protected nature reserves – if necessary, through compulsory purchase"
Dom
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The #PublicDomain: a belated step forward in the 🇺🇸, two huge steps back in 🇨🇦 & 🇳🇿 with a 20-year #CopyrightTerm extension - @glynmoody
#WalledCulture - the book uncovers more #CopyrightAbsurdities:
📕 https://walledculture.org/the-book #FreeEbook
#CopyrightWeek
https://walledculture.org/public-domain-a-belated-step-forward-two-huge-steps-back/
Dom
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RT @ProfBrianCox@twitter.com
Interesting from John Curtice in the Telegraph - Approx. 58% would vote to join EU now, 42% (average) support staying out. Current arrangements look unsustainable. Can Labour in particular maintain 'make Brexit work' policy if polls continue to shift? https://www.telegraph.co.uk/news/2023/01/09/wake-support-rejoining-eu-has-reached-critical-level/
🐦🔗: https://twitter.com/ProfBrianCox/status/1612504089715216416
Dom
boosted
RT @TheDisproof@twitter.com
Jordan Peterson shows how little he checks his sources below. The left image is from the GISP2 ice core whose data is from a single high altitude location in greenland and whose data ends in 1855. It is not a global record. Right hand image is. He is spreading misinformation.
🐦🔗: https://twitter.com/TheDisproof/status/1614890870037258240
#SoftMatter have just published the results of a project that Renato Assante, Davide Marenduzzo, Alexander Morozov, and I recently worked on together! What did we do and what’s new? Briefly…
#Microswimmer suspensions behave in a similar way to fluids containing kinesin and microtubules. Both systems can be described by the same system of three coupled nonlinear #PDEs.
A #LinearStabilityAnalysis of these equations suggests that variations in concentration across the system don’t significantly affect emergent #phaseBehaviour. How then can we explain #experiments that show visible inhomogeneities in #microtubule–#kinesin mixtures, for instance?
With increasing activity, we move away from the quiescent regime, past the onset of #SpontaneousFlow, and deeper into the active phase, where #nonlinearities become more important. What role do concentration inhomogeneities play here?
We investigated these questions, taking advantage of the #openSource #Dedalus #spectral framework to simulate the full nonlinear time evolution. This led us to predict a #novel regime of #spontaneous #microphaseSeparation into active (nematically ordered) and passive domains.
Active flow arrests macrophase separation in this regime, counteracting domain coarsening due to thermodynamic coupling between active matter concentration and #nematic order. As a result, domains reach a characteristic size that decreases with increasing activity.
This regime is one part of the #PhaseDiagram we mapped out. Along with our other findings, you can read all about it here!
low #ReynoldsNumber #turbulence #ActiveTurbulence #CahnHilliard #ActiveMatter #NavierStokes #BerisEdwards #CondensedMatter #PhaseTransitions #TheoreticalPhysics #BioPhysics #StatisticalPhysics #FluidDynamics #ComputationalPhysics #Simulation #FieldTheory #paperthread #NewPaper #science #research #ActiveGel #activeNematic #analytic #cytoskeleton #hydrodynamics #MPI #theory
#SoftMatter have just published the results of a project that Renato Assante, Davide Marenduzzo, Alexander Morozov, and I recently worked on together! What did we do and what’s new? Briefly…
The #hydrodynamic behaviour of inhomogeneous #activeNematic gels (such as extensile bundles of #cytoskeletal filaments or suspensions of low #ReynoldsNumber swimmers) can be described by the time evolution of three coupled #PDEs.
Standard #ActiveGel #theory concludes, from a #LinearStabilityAnalysis of these equations, that fluctuations in concentration don’t significantly affect emergent #phaseBehaviour. However, this leaves #experimental #observations of visible inhomogeneities in #microtubule–#kinesin mixtures unexplained. As we move away from the passive (quiescent) regime, past the onset of #SpontaneousFlow, and deeper into the active phase, #nonlinearities become more important. What role do concentration inhomogeneities play here?
Alongside #analytic techniques, we used an in-house #MPI-parallel code developed within the #Dedalus #spectral framework to investigate. We predict a #novel regime of #spontaneous #microphaseSeparation into active (nematically ordered) and passive domains. In this regime, active flow arrests macrophase separation, which is itself driven by the thermodynamic coupling between active matter concentration and #nematic order. As a result, domains do not #coarsen past a typical size, which decreases with increasing activity. This regime is one part of the #PhaseDiagram we mapped out.
Along with our other findings, you can read all about it here!
#CahnHilliard #ActiveMatter #NavierStokes #BerisEdwards #CondensedMatter #PhaseTransitions #TheoreticalPhysics #BioPhysics #StatisticalPhysics #FluidDynamics #ComputationalPhysics #Simulation #FieldTheory #paperthread #NewPaper #science #research
Dom
boosted
‘Why, in an era of rising seas and swollen rivers, was this low-lying English district, a reclaimed wetland with barely a free plot above the high-water mark on a spring tide, still building out?’
@_jamesmeek@twitter.com reports from England’s flood plains:
https://www.lrb.co.uk/the-paper/v45/n01/james-meek/underwater-living
Dom
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This actually isn’t surprising at all, but it still needs to said over & over — the biggest barrier to more urban biking in cities is the fear of cars.
“A study confirms that if we are serious about getting people on bikes, they need a safe place to ride.”
Via @lloydalter #TreeHugger #bikes #cities #urbanism #cars #BikeLanes
https://www.treehugger.com/fear-of-cars-biggest-biking-barrier-study-6979522
Dom
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Dom
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Election poster.
---
RT @AstroMikeMerri
If only there were some way to figure out what had gone wrong with the NHS…
https://twitter.com/AstroMikeMerri/status/1610270500973936641
Dom
boosted
We KNOW that MOBILITY IN CITIES IS ABOUT SPACE, and we’ve seen lots of great images from global cities reinforcing the point. This one might be my favourite, from #Santiago, because it ALSO shows the fundamental inequality/inefficiency of making buses run in mixed traffic.
Dedicate bus-only lanes.
#Chile #PublicTransit #cities #urbanism #cars #transit #transportation #PublicTransport #city
Dom
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Climate change, inequality
The #1Percent Are Many Times Worse Than the #Rainforest Wreckers ❧ #CurrentAffairs
"Let’s not permit #plutocrat-pampering pundits and #market-#greed-protecting #media to derail us from what should be the basic task of our #collective #ethical lives—to eradicate, as quickly as possible, all avoidable suffering."
#ClimateChange, #inequality, #rainforests
https://www.currentaffairs.org/2022/11/the-1-are-many-times-worse-than-the-rainforest-wreckers
Dom
boosted
The new Paris 2021-26 urban biking plan will invest €250 million to, among other things, make 52km of pandemic bike-lanes permanent; add 130km of new bike-lanes; add 130K new bike parking spots; & teach all elementary school students to bike.
Leadership.
https://www.paris.fr/pages/un-nouveau-plan-velo-pour-une-ville-100-cyclable-19554
#Paris #cities #urbanism #leadership #Hidalgo #bikes #bikelanes #transportation #mobility #urbanplanning #urbanbiking #citybuilding
Dom
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Dom
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To ensure cars didn’t take back control of #Paris streets as the pandemic was “ending” (no, it hasn’t ended), like they have in so many cities, Mayor #AnneHidalgo made sure that 60k parking spaces and many streets were permanently transformed into seating for restaurants, people places and bike-lanes.
Leadership.
#cities #urbanism #streets #streetsforpeople #peopleplaces #placemaking
Dom
boosted
If you enjoy someone's post on #Mastodon go ahead and click the star. If someone tells you that's meaningless because there's no #algorithm, ignore them. Sure, boost the post too if you want others to also see the post, but don't think telling someone you like what they posted is somehow unimportant. In real life I don't tell someone, "good job," or "well said," or "I love that," for the sake of some algorithm, I do it because I'm human and they are too. It's fundamental to being truly social.
Dom
boosted
A group at Johns Hopkins has created a scrollable, interactive map of the entire universe, from here to the cosmic microwave background.
Extraordinary discoveries at your fingertips for free, unimaginable when I was a kid. https://mapoftheuniverse.net/ #astronomy #space #exploration
Dom
boosted
#OnThisDay, 26 Nov 1867, Lily Maxwell voted in Chorlton Town Hall, Manchester, UK.
At the time only men who where ratepayers could vote. A widow running a shop, Maxwell’s name was put on the electoral roll by mistake.
She marched down to the town hall and voted, becoming the first recorded woman to vote in the UK.
#WomenInHistory #VotesForWomen #BritishHistory #Histodons @histodons
Dom
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There are so many fascinating insights in this article by Lambert Meertens about design principles and decisions in Python’s precursor languages, B and ABC.
Here’s one of them which says so much about Python and about “language wars” some still have today.
Context: It’s early 80s, talking about deciding to only allow integers as array indices, despite the fact it violated one of their design principles, with Guido van Rossum joining the ABC team at around this time:
“This design decision had been driven by fear: we had been concerned that aiming too high would make our language unimplementable on the small personal computers that were starting to appear on the market. But Dewar, in particular, convinced me that this meant we were designing for the past, not the future.”
And this observation should be seen in the context of another consideration that the designers of B and ABC had, which was common with another high-level language they were exposed to at the time. Here’s the quote:
“The design of SETL was predicated on the philosophy that, as computers became faster and faster, human time would be more valuable than computer time “and that the efficiency of the tool set SETL provided should not be measured in terms of speed of computation, but in their conceptual power.”
Some still have the debate nowadays about whether computer time or programmer time are more precious. Although this still depends on the case, more and more applications are programmer-time limited today.
But in the past, most (all?) applications were computer-time limited. Way back in the very early days it could take several hours to get the result of a program execution–no wonder languages at the time prioritised computation speed over development speed.
But things have moved on. Python took off because it came at a time when the switch over between computer-time limited applications and programmer-time limited ones was happening as computers became faster.
Yes, we still need the languages that prioritise computer-time today – there are still applications that need them, but the shift has happened and languages such as Python which prioritise the programmers’ time over the computer’s time will get more and more relevant (they already are, of course)
Article in Inference
- Pronouns
- he/him
Postgraduate researcher studying #CondensedMatter, in particular #SoftMatter, #ActiveMatter, #MolecularBiology, #CellBiology, #PhaseTransitions, and #ComplexSystems using the tools of #TheoreticalPhysics, #BioPhysics, #StatisticalPhysics, #FluidDynamics, #ComputationalPhysics, and #Simulation.
For instance, one of the projects I'm working on at the moment addresses #universality in active #turbulence with #spectral techniques. A related project predicts a new microphase separation regime in inhomogeneous active #nematics by simulating the coupled #CahnHilliard, #NavierStokes, and #BerisEdwards equations. Another project develops a #FieldTheory of the #orderphobic effect, a nonspecific interaction between #transmembrane bodies anchored in a #lipid #bilayer.
My other interests include #cycling, #ArchLinux, #Linux, #LibreSoftware, learning #Korean, #yoga, #calisthenics, #singing, #autonomy, #Cooperatives, #DeliberativeDemocracy, #CitizensAssemblies, #ParticipatoryDemocracy, #DemocraticInnovation, #OpenDemocracy, #LibertarianSocialism, #RightToRepair, #democracy, #humanism, #rationalism, #OpenScience, #science, #CommunityEmpowerment, #community, #commons, #research, #wikis, #governance.
Joined Nov 2022
