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#instability

2 posts2 participants0 posts today
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Nonilex

#Arctic #warming could pose a threat to America’s #security too: #Alaska may have new vulnerabilities to both #China & #Russia; changes in #ocean salinity & temp might interfere w/ #submarine detection systems; extremes of climate change, including #permafrost thaw in Russia, may drive #economic #instability, social #unrest, & territorial claims. [#Trump #Intelligence Agencies excluded #ClimateChange from the annual #ThreatAssessment report for the first time in decades — too *woke*]

#Greenland
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Nicole Sharp

A Stellar Look at NGC 602

The young star cluster NGC 602 sits some 200,000 light years away in the Small Magellanic Cloud. Seen here in near- and mid-infrared, the cluster is a glowing cradle of star forming conditions similar to the early universe. A large nebula, made up of multicolored dust and gas, surrounds the star cluster. Its dusty finger-like pillars could be an example of Rayleigh-Taylor instabilities or plumes shaped by energetic stellar jets. (Image credit: NASA/ESA/CSA/JWST; via Colossal)

The star cluster NGC 602, as seen by instruments on the JWST.
#astronomy#fluidDynamics#fluidsAsArt
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Nicole Sharp

Ultra-Soft Solids Flow By Turning Inside Out

Can a solid flow? What would that even look like? Researchers explored these questions with an ultra-soft gel (think 100,000 times softer than a gummy bear) pumped through a ring-shaped annular pipe. Despite its elasticity — that tendency to return to an original shape that distinguishes solids from fluids — the gel does flow. But after a short distance, furrows form and grow along the gel’s leading edge.

Front view of an ultra-soft solid flowing through an annular pipe. The furrows forming along the face of the gel are places where the gel is essentially turning itself inside out.

Since the gel alongside the pipe’s walls can’t slide due to friction, the gel flows by essentially turning itself inside out. Inner portions of the gel flow forward and then split off toward one of the walls as they reach the leading edge. This eversion builds up lots of internal stress in the gel, and furrowing — much like crumpling a sheet of paper — relieves that stress. (Image and research credit: J. Hwang et al.; via APS News)

GIF
GIF
#flowVisualization#fluidDynamics#instability
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Nonilex

The growing conviction that #Trump will stick by massive new #tariffs regardless of the economic fallout — amplified by Trump’s refusal to rule out a #recession on Sunday — fueled the drop across equity markets. The Dow Jones Industrial Average closed down 890 points, 2%, while the S&P 500 fell 2.7% & the Nasdaq Composite plummeted 4%.

#economy#finance#TradeWar
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Nonilex

#Trump’s senior advisers downplayed fresh economic turbulence Monday as the admin’s escalating #TradeWar deepened a sell-off on #WallStreet & renewed fears about the stability of the US #economy.

As all 3 major US #stock indexes slumped, Trump’s team projected confidence that the volatility would prove temporary & that an economic boom set off by tax cuts [for #corporations & the #wealthy] would follow later this year.

#tariffs #instability #finance #USpol #trumpcession
washingtonpost.com/business/20

The Washington Post · White House downplays economic ‘blips’ as stock market tumblesBy Jeff Stein
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Nonilex

For crying out loud, like a drunk toddler & for seemingly no reason at all, #Trump has now reversed his #tariffs on #Canada.
Trump said Thurs that he would allow BOTH #Mexico & Canada to avoid tariffs on most exports to the #US for 1 month, specifically products subject to the #USMCA, the #trade pact he signed in his first term.
The move came less than a day after he granted a 30-day reprieve to #automakers, & hours after announcing a pause on Mexico’s tariffs.
#economy #instability #geopolitics

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Nonilex

For rank-and-file workers, the latest move by #Musk underscored a climate of #instability & #fear inside the #FederalGovernment. One staff member at the National Institutes of Health, who spoke on the condition of anonymity out of fear of retaliation, said she was shocked by the message, which she said left her with a sick feeling in the pit of her stomach. When she found out more of the context, she said, she messaged a colleague: “They’re terrorizing us.”

#law#DOGE#Trump
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Nicole Sharp

Visualizing Unstable Flames

Inside a combustion chamber, temperature fluctuations can cause sound waves that also disrupt the flow, in turn. This is called a thermoacoustic instability. In this video, researchers explore this process by watching how flames move down a tube. The flame fronts begin in an even curve that flattens out and then develops waves like those on a vibrating pool. Those waves grow bigger and bigger until the flame goes completely turbulent. Visually, it’s mesmerizing. Mathematically, it’s a lovely example of parametric resonance, where the flame’s instability is fed by system’s natural harmonics. (Video and image credit: J. Delfin et al.; research credit: J. Delfin et al. 1, 2)

#2024gofm#combustion#combustionInstability
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Wizards Anonymous

Curious if others are experiencing #instability with #AMD processors or #GPU on #Linux or if this is #AlpineLinux specific. Opened an additional ticket that is focused on the AMD specific issue, since the last one appears it may have been generalized to the linux kernel overall. I do not see the same behavior on an #Intel #N100. gitlab.alpinelinux.org/alpine/ #bsod

GitLabAlpine 3.21.3 Crashes 25+ Times per Day with AMD (linux-firmware-amdgpu) (#16920) · Issues · alpine / aports · GitLab Package Information Package name: linux-firmware-amdgpu Package version: 20241210-r0 Alpine version: 3.21.3 Alpine architecture: x86_64
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Nicole Sharp

Jets, Shocks, and a Windblown Cavity

As material collapses onto a protostar, these young stars often form stellar jets that point outward along their axis of rotation. Made up of plasma, these jets shoot into the surrounding material, their interactions creating bright parabolic cavities like the one seen here. This is half of LDN 1471; the protostar’s other jet and cavity are hidden by dust but presumably mirror the bright shape seen here. (The protostar itself is the bright spot at the parabola’s peak.) Although the cavity is visibly striated, it’s not currently known what causes this feature. Perhaps some form of magnetohydrodynamic instability? (Image credit: NASA/Hubble/ESA/J. Schmidt; via APOD)

LDN 1471 is a bright cavity created by a protostar.
#astronomy#astrophysics#fluidDynamics
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Nicole Sharp

The Best of FYFD 2024

Welcome to another year and another look back at FYFD’s most popular posts. (You can find previous editions, too, for 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, and 2014. Whew, that’s a lot!) Here are some of 2024’s most popular topics:

  • The Taum Sauk Dam Failure and Its Legacy
  • Stretching Ant Rafts
  • Gigapixel Supernova
  • Feynman’s Sprinkler Solved
  • Calming the Waves
  • “Dew Point” Deposits Droplets
  • Drying Unaffected by Humidity
  • Trapped in a Taylor Column
  • Exciting a Flame in a Trough
  • Remembering Rivers Past
  • A Comet’s Tail
  • Light Pillars
  • Liquid Metal Printing
  • The Miscible Faraday Instability
  • A Triangular Prominence

This year’s topics are a good mix: fundamental research, civil engineering applications, geophysics, astrophysics, art, and one good old-fashioned brain teaser. Interested in what 2025 will hold? There are lots of ways to follow along so that you don’t miss a post.

And if you enjoy FYFD, please remember that it’s a reader-supported website. I don’t run ads, and it’s been years since my last sponsored post. You can help support the site by becoming a patron, buying some merch, or simply by sharing on social media. And if you find yourself struggling to remember to check the website, remember you can get FYFD in your inbox every two weeks with our newsletter. Happy New Year!

(Image credits: dam – Practical Engineering, ants – C. Chen et al., supernova – NOIRLab, sprinkler – K. Wang et al., wave tank – L-P. Euvé et al., “Dew Point” – L. Clark, paint – M. Huisman et al., iceberg – D. Fox, flame trough – S. Mould, sign – B. Willen, comet – S. Li, light pillars – N. Liao, chair – MIT News, Faraday instability – G. Louis et al., prominence – A. Vanoni)

The Taum Sauk Dam after repairs.
#admin#ants#astrophysics
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Marie 🇸🇪

Currently, there’s over 110 active armed conflicts globally, involving various types of actors, ranging from full-scale international wars, such as Russia & Ukraine, to civil wars & insurgencies, like Myanmar, Ethiopia & Yemen. Regions such as the Middle East & Africa are particularly affected, with over 75 conflicts, driven by political instability, ethnic tensions & external interventions.
War involves a large part of human history with a deep-rooted pattern.

A little girl sprays white paint on a brick wall, stop war, where the words weave into each other in a clever way & form one word.
#war#CivilWars#instability
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💧🌏 Greg Cocks

Linking Inca Terraces With Landslide Occurrence In The Ticsani Valley, Peru
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doi.org/10.3390/geosciences141 <-- shared paper
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[takes me back to my engineering geology days in the Southern Hemisphere, including my thesis – with a healthy dose of spatial analysis and modeling – and all with a specific use; what is not to like?]
#GIS #spatial #mapping #landslides #massmovement #Inca #Andes #irrigation #terraces #Peru #SouthAmerica #confusionmatrix #logisticregression #geohazards #spatialanalysis #spatiotemporal #terracing #water #hydrology #surfaceflow #geomechanical #geotechnical #Ticsani #algorithm #processes #geostatistics #river #slope #agriculture #farming #soils #geology #risk #hazard #publicsafety #fem #model #modeling #rainfall #precipitation #permeability #groundwater #subsurfaceflow #instability #fluvial #erosion

photo - terraces in part of the Ticsani Valley, Peru
photos - (A) The main fluvial landforms in the AOI. The Carumas river can be seen here to be bounded by landslides affecting a fluvial terrace covered by agricultural terraces. (B) Landslides affecting a slope close to a community in the AOI. Note the construction of terraces on prior landslide deposits.
schematic / cross-section - Typical profile of terraces built in Southern Peru. Wall rocks are directly piled over an excavated trench in bedrock without mortar. An upward decreasing gradation is used to fill the internal portion of the wall in compacted layers. Fertile arable soil is placed in the top 30 cm.
imagery / map / schematic cross-section - (A) A 3D view of the San Cristobal landslide. (B) A 1:50,000 geological map of the landslide area, modified from [33]. Ki-mat = Matalaque Fm. P-Pi = Puno Fm. Q-pl = colluvial deposits, debris avalanche. Qp-vl-pi = pyroclastic deposits. Red line marks the topographic cross-section shown in A. (C) Cross-section of the San Cristobal landslide with estimated base groundwater conditions (blue) and materials boundaries (green) to be used for modeling and interpreted potential failure surfaces (dashed red).
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