@memeorandum@universeodon.comTension between Mullin and White House appears to be growing, sources say (NBC News)
https://www.nbcnews.com/politics/immigration/tension-appears-growing-mullin-white-house-sources-say-rcna588719
http://www.memeorandum.com/260724/p1#a260724p1
@davidaugust@mastodon.online
@arXiv_physicsfludyn_bot@mastoxiv.pageElastohydrodynamic instability of a spinning elastic disk
Sifan Yin, Paul R. Kaneelil, L. Mahadevan
https://arxiv.org/abs/2607.19561 https://arxiv.org/pdf/2607.19561 https://arxiv.org/html/2607.19561
arXiv:2607.19561v1 Announce Type: new
Abstract: A soft thin elastic disk spinning in a viscous fluid experiences centrifugal tension generated by rotation together with viscous shear generated by the surrounding flow. While the former stabilizes the flat state, the latter can destabilize it. We combine the linearized F\"{o}ppl-von K\'{a}rm\'{a}n equations for a rotating elastic disk with the shear stresses arising from the classical von K\'{a}rm\'{a}n swirling flow to derive an elastohydrodynamic stability problem. Linear stability analysis identifies the onset of buckling in terms of two dimensionless control parameters measuring centrifugal stiffening and fluid-induced shear. Above threshold the disk buckles into azimuthally periodic saddle-like modes whose wavenumber increases with increasing rotational tension. The buckled configuration also supports retrograde traveling waves that rotate more slowly than the material frame. These results identify a simple mechanism whereby fluid shear destabilizes rotating elastic structures.
toXiv_bot_toot
@hex@kolektiva.socialRE: https://dair-community.social/@ZekuZelalem/117320888712641893
There's a bit of context behind this that's worth being aware of, and I'll do my best to explain it second (or third) hand. Abiy Ahmed has been the prime minister of Ethiopia since 2019. He was quite popular initially, but has held on to power for quite a while and has been called out for authoritarian tendencies.
His party, the Prosperity Party, is a liberal party that has privatized parts of the economy and is trying to dismantle ethnic federalism. This type of "modernization" is obviously supported by neoliberal forces around the world, especially since he took over from the ethno nationalist ML TPLF.
The TPLF was also authoritarian, brutal, and anti-democratic, as one would expect from an ML organization. Part of Abiy's popularity came from opposition to the TPLF. But more recently, but his forces also carried out genocide in Tigray during that war in 2022 (after his Nobel Peace Prize).
Part of the opposition to his modernization is that ending ethnic federalism would weaken the power of older ethnic structures. This could be seen as similar in some ways to conflicts across Europe in from 1848 through to the early 1900's and in the Balkans after the fall of the Soviet Union.
The connection between ethnicity and nationality has never really stopped causing problems. Liberalism is usually connected to the domination of one ethnic group into a singular national identity. This flows from the French Revolution, through the Russian revolution, and into both the Ethnic ML exported by Communist Russia as part of their attempts to weaken European capitalism and (via both American Colonial Nationalism and the French Revolution) into the Neoliberalism promoted by the US and European powers as a counter.
Ethiopia is a multiethnic country. Unfortunately the logic of the state (liberal or communist) tends to destroy these ethnic identities through a combination of ethnic cleansing, appropriation, and (often forced) integration.
Some of the conflict here is coming out of the tension between a national identity and ethnic identity, especially in relation to Tigray and Amhara, as well as the continued pressure of economic liberalization, and centralization vs federalization.
The point is that it's actually quite a bit more complicated than it may be presented as, especially outside of the religion. European interests may align with Abiy, and present him as a "modernizing force." Addis is one of the centers of the African Union. Meanwhile, other countries have their own interests in stoking this conflict. China, Turkey, the UAE, and Iran all sell drones to the Federal government. Eretria has an interest in creating a buffer zone to keep Ethiopia from seizing a port city from them. Sudan is involved, and I don't have the local political depth to know why.
Various groups will try to point to one group or another as the "good guy/bad guy" but it's definitely not that simple. It's just kind of tragic for everyone. I hope Ethiopian people find peace and freedom.
My hope is that Ethiopia will develop something like Democratic Confederalism that resolves these conflicts and tensions without wiping out the unique identities of the peoples who make up Ethiopia.
@stargazersmith@social.linux.pizzaThe Oldest Stars in the Galaxy Just Weighed In on One of Cosmology's Biggest Arguments - Universe Today https://www.universetoday.com/articles/the-oldest-stars-in-the-galaxy-just-weighed-in-on-one-of-cosmologys-bigges…
@arXiv_astrophGA_bot@mastoxiv.pageVz-GAL Dusty Star-Forming Galaxies: Revisiting the CO-H2 Conversion Factor Tension
Prachi Prajapati, Axel Weiss, Dominik Riechers, Tom J. L. C. Bakx, Leindert A. Boogaard, Diana Ismail, Pierre Cox, Andrew J. Baker, Roberto Neri, Matthew Lehnert, Chentao Yang, Emilio Romano-Diaz, Hiddo S. B. Algera, Stefano Berta, Edoardo Borsato, Kirsty M. Butler, Asantha Cooray, Bethany Jones, Amelie Saintonge, Paul van der Werf
https://arxiv.org/abs/2607.18440 https://arxiv.org/pdf/2607.18440 https://arxiv.org/html/2607.18440
arXiv:2607.18440v1 Announce Type: new
Abstract: The CO luminosity-to-H$_2$ mass conversion factor ($\alpha_{CO}$) remains a debated uncertainty in determining molecular gas masses of high-redshift dusty star-forming galaxies (DSFGs). Dynamical mass constraints have often favored $\alpha_{CO}=0.8$~$M_{\odot}~{(K~km~{s}^{-1}~{pc}^{2})}^{-1}$, whereas dust- and radiative-transfer-based methods imply higher values. We revisit this ``tension" using the largest homogeneous sample of 21 unlensed $z\sim1-4$ DSFGs, with securely measured \coonezero luminosities from the VLA \vzgal survey and resolved ($\sim{0.1}^{\prime\prime}$) ALMA 1~mm dust continuum imaging. For 12 galaxies with robust modeling constraints, we derive molecular gas masses using dust spectral energy distribution modeling and the TUNER LVG framework, adopting a solar-metallicity gas-to-dust mass ratio of 100. Although not fully independent due to shared assumptions on dust properties, these approaches yield mutually consistent gas masses corresponding to $\alpha_{CO}\sim1.5-11.5$, with a median near the Galactic $\alpha_{CO}=4.3$. Isotropic virial dynamical masses agree with these gas masses when realistic molecular gas sizes are adopted, while our proposed ``mixed" (rotating, pressure-supported, thick-disk) estimator systematically underestimates dynamical masses, producing low $\alpha_{CO}$ limits. Using GN20 ($z=4.055$) as a case study, we show that resolved gas geometry and kinematics reconcile the discrepancy with LVG-derived $\alpha_{CO}$. Our results suggest that current data do not require $\alpha_{CO}=0.8$, and intermediate to near-Galactic values remain dynamically viable given uncertainties in gas geometry, dust properties, and gas-to-dust ratios. Further progress in calibrating $\alpha_{CO}$ in the early universe will require resolved molecular gas observations, physically motivated ISM modeling, and stringent constraints on dust properties.
toXiv_bot_toot
@cdarwin@c.imA long-promised makeover of the VA’s West L.A.’s historic Building 13 will create just 24 units of homeless veteran housing
-- at an estimated $1.25 million per apartment,
-- likely a record-setting cost.
The renovation, financed through VA funds and tax credits,
highlights tension over the campus’s future,
pitting housing plans against earlier visions of a bustling veterans town center.
The project unfolds amid court orders to add thousands of units on t…
@brichapman@mastodon.socialCreation and destruction often come hand in hand.
On my free Substack, I write about holding tension without falling apart—and building something beautiful in the midst of unraveling. https://substack.com/@bricchapman
@avalon@jazztodon.comThe Night Jazz Fought Back - by Bret Primack
Jazz has always carried this tension inside it. Music built under conditions of exclusion and exploitation, transformed into something that outlasted both. At Newport in 1960, for a few days in someone’s backyard, musicians refused to let the institutions that packaged their work decide what they would play. They asserted control. They played like the music belonged to them.
@arXiv_astrophCO_bot@mastoxiv.pageModified Cosmological Expansion and the JWST CMB Optical Depth Tension in Self Interaction Gravity
Subhadeep Mukherjee, Shashank Shekhar Pandey, A. S. Majumdar
https://arxiv.org/abs/2608.03470 https://arxiv.org/pdf/2608.03470 https://arxiv.org/html/2608.03470
arXiv:2608.03470v1 Announce Type: new
Abstract: Recent James Webb Space Telescope (JWST) observations favor an earlier and more efficient reionization history, leading to Thomson-scattering optical depths larger than those inferred from the cosmic microwave background (CMB). We investigate whether this tension can be alleviated within the framework of self-interaction (SI) gravity by modifying the cosmological expansion history while retaining the standard astrophysical description of reionization. The SI gravity parameters are constrained through a Bayesian MCMC analysis of the Union3 Type Ia supernova and DESI DR2 Baryon Acoustic Oscillations (BAO) data. The resulting expansion history is then used to predict the ionization history and Thomson optical depth. We find that the predicted optical depth decreases from $\tau_{\rm{CMB}}\simeq0.076$ in $\Lambda$CDM to $\tau_{\rm{CMB}}\simeq0.061$, consistent with the Planck PR4 measurement within $1\sigma$, thereby substantially reducing the optical-depth tension.
toXiv_bot_toot
@brichapman@mastodon.socialCreation and destruction often come hand in hand.
On my free Substack, I write about holding tension without falling apart—and building something beautiful in the midst of unraveling. https://substack.com/@bricchapman
@june_thalia_michael@literatur.social#EroticMusings 62. Do power imbalances exist within the romantic or sexual relationships between your characters? Is this a challenge for you? Does it present unique opportunities?
I'm writing BDSM novels, so power imbalance during a session is the point and centerpiece of the writing.
I like to explore the tension between the kinky roles and the out-of-play roles of charac…
@cdarwin@c.imA Senate committee voted Thursday to hold Dr. Anthony S. Fauci,
the scientist who led the country’s Covid response,
in contempt of Congress for declining to answer questions during a hearing last week.
But will the courts uphold it?
Dr. Fauci invoked his constitutional right under the Fifth Amendment to remain silent,
refusing to respond to a single question during the three-hour session of the Senate Homeland Security Committee.
Republicans on the panel, …
@arXiv_condmatsoft_bot@mastoxiv.pageLipid Controlled Non-Monotonic Assembly and Rheology of an Egg Yolk Protein at Water-Soybean Oil Interface
Nancy Jaglan, Rumal Singh, Sajal K Ghosh
https://arxiv.org/abs/2608.11825 https://arxiv.org/pdf/2608.11825 https://arxiv.org/html/2608.11825
arXiv:2608.11825v1 Announce Type: new
Abstract: An essential component of food items like mayonnaise and salad dressing is hen egg yolk. Phosvitin (PVT) is a phosphoprotein, which exists in the granules of this hen egg yolk which stabilizes the food emulsion by preventing phase separation. To understand, how this protein is adsorbed at the interface of water and edible oil in the presence and absence of lipids is essential for improved control in food production. To monitor the kinetics of this adsorption, the dynamic interfacial tension has been determined in the current investigation. The drop in interfacial tension over time indicates the adsorption of protein at interface which is enhanced on increasing the concentration of protein in water phase. However, at higher concentration, the positive activation energy hinders the adsorption process resulting a saturated interfacial tension. The dilation rheology of the macromolecular film at this oil-water interface shows the elastic nature of the film to be greater than the viscous nature, indicating the formation of a soft gel film. At low concentration, the zwitterionic lipid, 1-palmitoyl-2-oleoyl-sn-glycero 3-phosphocholine (POPC), promotes this protein adsorption at the interface. Interestingly, at high concentration, the lipid overtakes the interface removing the protein from there. The lipid-protein composite film again shows the nature of a soft gel. The non-monotonic effects of lipids on assembly of protein at the water-edible oil interface is an important observation to optimize the composition of relevant food products.
toXiv_bot_toot
@kexpmusicbot@mastodonapp.uk🇺🇦 #NowPlaying on KEXP's #SonicReducer
Frankenstein:
🎵 High Tension Wire
#Frankenstein
@arXiv_hepth_bot@mastoxiv.pageInformation-Theoretic Black Hole Entropy I: Beyond the Area Law
Alex Kehagias
https://arxiv.org/abs/2608.05795 https://arxiv.org/pdf/2608.05795 https://arxiv.org/html/2608.05795
arXiv:2608.05795v1 Announce Type: new
Abstract: Although the Bekenstein-Hawking area law is consistent with the first and second laws of black hole thermodynamics, it appears to be in conflict with the third law, which in the Nernst formulation states that the entropy should either vanish or approach a universal constant in the zero-temperature limit. We argue that this tension reflects a limitation of the semiclassical area law rather than a fundamental feature of black hole thermodynamics. On this basis, we obtain an entropy formula that is consistent with the third law, and approaches Bekenstein-Hawking entropy in the high-temperature limit. The resulting entropy admits a simple microscopic interpretation, and it can be written as the Kullback-Leibler divergence between a mass-biased Bernoulli distribution and the uniform distribution on N microscopic bits. From this perspective, the thermodynamic black hole entropy admits an information-theoretic representation as an entropy deficit, namely as the relative entropy between the black hole ensemble and a maximally mixed reference ensemble. The Bekenstein-Hawking area law then emerges as the leading term in an $1/N$ expansion, while a universal mass scale $M_0=\sqrt{N}\,M_P$, interpreted as an absolute upper bound on the black hole mass, controls the bias of the underlying microscopic ensemble. The subleading terms represent finite-information corrections to the classical area law.
toXiv_bot_toot
@arXiv_astrophGA_bot@mastoxiv.pageSmall-Scale Clustering of Primordial Black Holes: The Little Red Dot Mass Function and the High-Redshift Galaxy Tension
Borui Zhang, Wei-Xiang Feng, Haipeng An
https://arxiv.org/abs/2609.09078 https://arxiv.org/pdf/2609.09078 https://arxiv.org/html/2609.09078
arXiv:2609.09078v1 Announce Type: new
Abstract: Supermassive black holes (SMBHs) in "little red dots" (LRDs) discovered the James Webb Space Telescope (JWST) may result from runaway mergers of primordial black holes (PBHs) in clusters---through long--short mode coupling on small scales in the early Universe. In this framework, we derive the SMBH mass function, together with the compactness and overmassive features of LRDs. We also estimate that the dense gas residing in PBH clusters is consistent with LRD observations. In addition, SMBHs formed from PBH clusters can help accelerate galaxy formation at high redshifts, thus alleviating tension with $\Lambda$CDM cosmology.
toXiv_bot_toot
@memeorandum@universeodon.comTension with unions shadows Moore's run-up to 2028 (Holly Otterbein/Axios)
https://www.axios.com/2026/06/28/maryland-wes-moore-union-problems-2028
http://www.memeorandum.com/260628/p39#a260628p39
@arXiv_hepth_bot@mastoxiv.pageReplaced article(s) found for hep-th. https://arxiv.org/list/hep-th/new
[2/3]:
- Toward an Observable Algebra for de Sitter Space: Gap Protection and Modular Dressings
Hassan ElSayed
https://arxiv.org/abs/2607.26194 https://mastoxiv.page/@arXiv_hepth_bot/117007888988009612
- Extended Scalar Particle Solutions in Black String Spacetimes with Anisotropic Quintessence
M. L. Deglmann, B. V. Sim\~ao, C. C. Barros Jr
https://arxiv.org/abs/2504.17765 https://mastoxiv.page/@arXiv_grqc_bot/114397428123774125
- Universal supercritical thermodynamics for black holes
Shoucheng Wang, Xinyang Li, Yuliang Jin, Li Li
https://arxiv.org/abs/2506.10808 https://mastoxiv.page/@arXiv_grqc_bot/114675464316469493
- Running Quantum Computers in Discovery Mode
Aydin Deger, Benedikt Placke, G. J. Sreejith, Alessio Lerose, S. L. Sondhi
https://arxiv.org/abs/2507.01013 https://mastoxiv.page/@arXiv_quantph_bot/114783153034025740
- Full Eigenstate Thermalization in Integrable Spin Systems
Tanay Pathak
https://arxiv.org/abs/2510.05887 https://mastoxiv.page/@arXiv_condmatstatmech_bot/115337676705890347
- Boundary structure of gauge fields on asymptotically AdS spaces
Maxim Grigoriev, Mikhail Markov
https://arxiv.org/abs/2512.06576 https://mastoxiv.page/@arXiv_mathph_bot/115688746382829511
- Improved frequency hierarchy treatment for anisotropic spectral distortions
Jens Chluba, Sara Evangelista, Tom Daman, Geoff Vasil
https://arxiv.org/abs/2602.14963 https://mastoxiv.page/@arXiv_astrophCO_bot/116085543680916118
- Black-Hole Microstate Hair Requires a Horizon Measurement
Sudhanva Joshi, Sunil Kumar Mishra
https://arxiv.org/abs/2604.28050 https://mastoxiv.page/@arXiv_quantph_bot/116498398591886253
- Unified dark sector and Hubble-tension alleviation in scalar-vector-tensor gravity
Kimet Jusufi, Amir A. Khodahami, Ahmad Sheykhi, Jackson Levi Said, Emmanuel N. Saridakis
https://arxiv.org/abs/2605.14977 https://mastoxiv.page/@arXiv_grqc_bot/116577642488987255
- Exact spectrum and anomalous relaxation in the open disorder-free Sachdev-Ye-Kitaev system
Soshun Ozaki, Hironobu Yoshida, Hosho Katsura
https://arxiv.org/abs/2606.08079 https://mastoxiv.page/@arXiv_condmatstrel_bot/116719187444301432
- Energy Flux as an Entanglement Current in Moving-Mirror Radiation
Yasusada Nambu, Riku Yoshimoto
https://arxiv.org/abs/2607.19763 https://mastoxiv.page/@arXiv_grqc_bot/116968262813501741
toXiv_bot_toot
@arXiv_condmatsoft_bot@mastoxiv.pageBlinking membrane patterns induced by protein binding/unbinding
Hiroshi Noguchi
https://arxiv.org/abs/2608.13016 https://arxiv.org/pdf/2608.13016 https://arxiv.org/html/2608.13016
arXiv:2608.13016v1 Announce Type: new
Abstract: Nonequilibrium membrane pattern formation is studied using meshless membrane simulation. Bound proteins are considered to have two states that generate different membrane spontaneous curvatures. Protein binding and unbinding occur cyclically owing to chemical potential differences, as an off-lattice active Potts model. It is found that this cyclic binding/unbinding can induce blinking domains, with oscillating size: convex domains of the proteins with a higher spontaneous curvature grow, and subsequently, the proteins change to the other state with a lower spontaneous curvature, resulting in domain shrinkage. These processes repeat. In thermal equilibrium, hexagonal convex domains are formed by the competition between bending and surface tension energies, so that they are stably formed only under positive surface tension. However, blinking domains can form even in tensionless membranes.
toXiv_bot_toot
@arXiv_astrophCO_bot@mastoxiv.pageRevisiting the equation of state of dark energy from DESI BAO with SNe Ia and CMB
Jie Zheng, Da-Chun Qiang, Zhi-Qiang You, Darshan Kumar
https://arxiv.org/abs/2608.04353 https://arxiv.org/pdf/2608.04353 https://arxiv.org/html/2608.04353
arXiv:2608.04353v1 Announce Type: new
Abstract: The Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) have recently shown a mild preference for dynamical dark energy over the standard $\rm \Lambda$CDM model. In this paper, we analyze the $w_0w_a$CDM model using DESI BAO DR2, Pantheon SNe Ia, and Planck 2018 CMB distance prior data. To examine how different parts of the data affect the apparent deviation from $\rm \Lambda$CDM, we adopt two complementary redshift-cut strategies, dividing the dataset into $zz_{\rm cut}$ subsamples. We find that the most noticeable shifts occur when BAO and SNe Ia data in the redshift range $z\sim0.4$--$0.8$ are included, reaching a significance of about $\sim2\sigma$. Within this framework, the inclusion of higher-redshift measurements progressively weakens this deviation and brings the constraints closer to the $\rm \Lambda$CDM expectation. Moreover, the information criteria show no statistically significant preference between the $w_0w_a$CDM and $\rm \Lambda$CDM models, while the Bayesian information criterion consistently favors the $\rm \Lambda$CDM model. In addition, a parameter-shift consistency test reveals no statistically significant tension between complementary redshift subsamples. Within the DESI BAO DR2, Pantheon , and CMB distance prior framework adopted here, these results do not provide statistically robust evidence favoring the $w_0w_a$CDM model over $\rm \Lambda$CDM. They instead indicate that the apparent parameter shifts under different redshift cuts may be affected by statistical fluctuations and by the limited precision and number of datapoints in the current subsamples. Our analysis provides a complementary redshift-dependent diagnostic for assessing how the inferred cosmological constraints vary under different redshift selections.
toXiv_bot_toot
@memeorandum@universeodon.comTrump-Netanyahu rift widens as election pressures pull them in opposite directions (Washington Post)
https://www.washingtonpost.com/politics/2026/08/11/trump-netanyahu-experience-tension-critical-election-year/
http://www.memeorandum.com/260811/p11#a260811p11
@arXiv_astrophCO_bot@mastoxiv.pageNon-Thermal Pressure due to Gas Motions in the Intracluster Medium: Confronting XRISM/Resolve with TNG-Cluster Simulations
Erwin T. Lau, Naomi Ota, Daisuke Nagai
https://arxiv.org/abs/2608.04757 https://arxiv.org/pdf/2608.04757 https://arxiv.org/html/2608.04757
arXiv:2608.04757v1 Announce Type: new
Abstract: Intracluster medium (ICM) gas motions probe cluster assembly, feedback, and non-thermal pressure support, but recent XRISM observations reveal velocity dispersions and non-thermal pressure fractions systematically lower than simulations predict, with extreme systems such as Abell 2029 falling below nearly all simulated clusters. Using the TNG-Cluster simulations, we show that the non-thermal pressure fraction depends sensitively on cool-core state and formation history, and provide a two-scale fitting function capturing both the inner cool-core suppression and outer rise of the radial profile. By forward-modeling mock XRISM observations and comparing them with both projected and intrinsic three-dimensional quantities, we find that azimuthal variations and projection effects contribute to the deficit in the observed velocity dispersion and non-thermal pressure fraction. This bias increases with radius and partially offsets the intrinsic outward rise in the true three-dimensional non-thermal pressure fraction. However, these effects cannot explain the extremely low values of the non-thermal pressure fraction observed in Abell 2029, which fall below approximately the 0th - 6th percentiles of the simulated cool-core cluster distribution at every measured radius under both the turbulence-only and turbulence-plus-bulk definitions. The remaining tension points to rare dynamical conditions or missing physics affecting the amplitude of gas motions in current ICM models.
toXiv_bot_toot
@brichapman@mastodon.socialYour body can register tension in a room before anyone gives you feedback. Those small signals can prime a strong reaction to an ordinary comment.
From Presence and Possibility with Bri Chapman.
@arXiv_astrophCO_bot@mastoxiv.pageIntegrated cosmological memory: A dark-siren method to probe dark energy
Indranil Chakraborty, Sayantan Ghosh, Susmita Jana, Archana Pai, S. Shankaranarayanan
https://arxiv.org/abs/2608.03739 https://arxiv.org/pdf/2608.03739 https://arxiv.org/html/2608.03739
arXiv:2608.03739v1 Announce Type: new
Abstract: Gravitational-wave (GW) cosmology is currently bottlenecked by the scarcity of electromagnetic counterparts for bright sirens and the systematic uncertainties of galaxy catalogs for dark sirens. We propose a purely gravitational resolution using the Integrated Cosmological Memory (ICM)-the cumulative GW strain encoded in the spacetime geometry of an expanding Universe. While the GW transient emitted by the source provides the luminosity distance, the ICM accumulates a mathematically distinct integral of the cosmic expansion history. We demonstrate that extracting both observables from a single binary merger completely breaks the distance-redshift degeneracy within the gravitational sector. This establishes a novel, catalog-free dark siren framework for third-generation GW detector networks. Crucially, the resulting constraints on late-time dark energy are only weakly sensitive to the local expansion rate, providing a robust cosmological probe that can potentially mitigate the impact of the H0 tension.
toXiv_bot_toot
@arXiv_condmatsoft_bot@mastoxiv.pageA Multi-scale Investigation of Aqueous Foams Stabilised by PNIPAM Microgels
Joanne Zimmer, Luca Mirau, Kevin Gr\"aff, Ga\"etan Barth, Carina Schneider, Vera A. N. A. Hesse, Hayden Robertson, Regine von Klitzing
https://arxiv.org/abs/2608.11999 https://arxiv.org/pdf/2608.11999 https://arxiv.org/html/2608.11999
arXiv:2608.11999v1 Announce Type: new
Abstract: Aqueous foams possess multiple structural motifs across different length scales: macroscopic foam, bubbles, foam films and the air/water interface. In this study, macroscopic foams are generated by sparging gas through an aqueous dispersion of PNIPAM microgels which act as foam stabilisers due to their surface activity. The stiffness of the microgels and thus their interfacial activity are tuned by variation of the cross-linker density. The effect of the cross-linker density and the microgel concentration on the resulting foam formation properties (foamability) and the foam stability are investigated. A lower cross-linker density and a higher microgel concentration enhance the foamability, generate foams with smaller bubbles and higher liquid fractions, and increase the foam stability. These observations are correlated with the microgel behavior at the single air/water interface examined by pendant drop tensiometry and Langmuir compression experiments as well as the mobility in single free-standing foam films determined using a Thin Film Pressure Balance. Our findings highlight good agreement across all length scales: increased foamability correlates with a faster decrease in surface tension, and higher foam stability with a higher surface elastic modulus of a microgel-covered single air/water interface and decreasing mobility in foam films.
toXiv_bot_toot
@BBC3MusicBot@mastodonapp.uk🇺🇦 #NowPlaying on BBCRadio3's #LateJunction
Mulatu Astatke & Hoodna Afrobeat Orchestra:
🎵 Tension
#MulatuAstatke #HoodnaAfrobeatOrchestra
@chris@mstdn.chrisalemany.caooo. I have a new top candidate for cause of accelerated water loss. Cedar chips.
I checked the whole perimeter of the top pond after the system filled and all was good there. But then I did a check of the bottom pond, which is steeper on the edges and harder to do, so I do it less lol.
Right away I found a problem. The flat stones had slipped slightly into the water (likely due to animal visitors over the winter). Edit: just saw a black (invasive) squirrel on the sidewalk near our house! First time. I wonder if he is the messer of flat stones and stealer of fish from the bottom pond!!
Once I reposistioned them, I realized there were a lot of cedar wood chips that had also slipped down, particularly near the skimmer box and were --- HALF IN AND HALF OUT --- of the water.
They were waterlogged.
This is bad.
Dry wood chips outside the water is obviously fine.
Wood chips floating on or sunk under the water is fine.
Any mass of woody material chips, sticks, logs, or even small gravel on the edge of the water, will act as a siphon. They suck up the water and then give lots of surface area for it to quickly evaporate. It has been a rainy July so the woody debris may have already been wet and not evaporating much, but it has been dry for a few days now, and hot the past two. Any siphoning/evaporatoon action would be supercharged.
In the case of gravel, the surface tension between the rocks can cause the edge of the water to creep uphill and also reach the top of the gravel, enhancing evaporation.
Today I found a whole mass of cedar and dirt along the edge of the pond under the flat stones on top of the liner. It was near the skimmer, likely from the gate work.
Bad news.
So I scooped it all out and up onto dry land, and to make sure woody debris can't get to the waters edge under the flat stones, I added some drainage rock along the edge. This should keep the dry and wet zones better separated!
That was just the near side edge of the bottom pond. I haven't checked the far side by the fence.
I might do that tomorrow, but there has been a lot less disturbance there over the past year, so I doubt it will need much help.
I am pretty confident I found the biggest culprit. If my hunch is right, Ill know later today and tomorrow if the water remains relatively stable. It will be hot today so there will be evaporation, but it should not need an emergency fill tomorrow.
Fingers crossed!
Bonus #poolpond content lol. The milfoil is looking very hapoy. It has settled in and the leafy fingers are vertical poking out of the water which is a good sign that they are continuing on happily in their new location. yay!
#pandemicpond #pandemicpond #pondlife #gardening #home #diy #IT #TroubleShooting
