Tootfinder

Counterflow around a cylinder
Matheus P. Severino, Leandro F. Souza, Elmer M. Gennaro, Daniel Rodr\'iguez, Fernando F. Fachini
https://arxiv.org/abs/2602.22022 https://arxiv.org/pdf/2602.22022 https://arxiv.org/html/2602.22022
arXiv:2602.22022v1 Announce Type: new
Abstract: The incompressible flow around a circular cylinder, positioned at the center of an unconfined planar counterflow, is studied by means of numerical solutions of the conservation equations and linear stability analysis. The flow is completely defined by the Reynolds number ($\Rey$) -- based on the cylinder radius, the strain rate defining the counterflow, and the kinematic viscosity. For very low values of $\Rey$, the flow is steady, two-dimensional, and fully attached to the cylinder wall. Increasing $\Rey$ above $\Rey_s \approx 16.86$, the flow separates, giving rise to two symmetric, counter-rotating recirculation regions on each side of the cylinder. Further increasing $\Rey$ leads to a progressive enlargement of the recirculation regions and the appearance of multiple recirculation centers, akin to Moffatt eddies. However, the convective acceleration imposed by the counterflow limits their size. An oscillatory mode becomes linearly unstable for $\Rey_{c} \approx 4146$. This mode gives rise to a sinuous meandering of the wake flow, on each side of the cylinder, being analogous to the well-known von K\'arm\'an instability. The frequency of this mode is directly proportional to the strain rate defining the counterflow.
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A board-certified cardiologist in December expressed alarm over the state of Trump's health, citing several instances in recent weeks where he appeared to fall asleep during crowded White House meetings before jolting suddenly into periods of intense energy.
"He's done this several times in the last few weeks. He's fallen asleep in a crowded Oval Office and he's also fallen asleep at Cabinet meetings with people talking directly to him. That's what's called…

Doctor gives verdict on Trump's brain function after POTUS claimed he 'aced' cognitive exam
Trump declared last week he had correctly answered every question "for the third straight time" during his most recent mental health check

Copy-Trasform-Paste: Zero-Shot Object-Object Alignment Guided by Vision-Language and Geometric Constraints
Rotem Gatenyo, Ohad Fried
https://arxiv.org/abs/2601.14207 https://arxiv.org/pdf/2601.14207 https://arxiv.org/html/2601.14207
arXiv:2601.14207v1 Announce Type: new
Abstract: We study zero-shot 3D alignment of two given meshes, using a text prompt describing their spatial relation -- an essential capability for content creation and scene assembly. Earlier approaches primarily rely on geometric alignment procedures, while recent work leverages pretrained 2D diffusion models to model language-conditioned object-object spatial relationships. In contrast, we directly optimize the relative pose at test time, updating translation, rotation, and isotropic scale with CLIP-driven gradients via a differentiable renderer, without training a new model. Our framework augments language supervision with geometry-aware objectives: a variant of soft-Iterative Closest Point (ICP) term to encourage surface attachment and a penetration loss to discourage interpenetration. A phased schedule strengthens contact constraints over time, and camera control concentrates the optimization on the interaction region. To enable evaluation, we curate a benchmark containing diverse categories and relations, and compare against baselines. Our method outperforms all alternatives, yielding semantically faithful and physically plausible alignments.
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Fanciful Figurines flip Free Flood-It -- Polynomial-Time Miniature Painting on Co-gem-free Graphs
Christian Rosenke, Mark Scheibner
https://arxiv.org/abs/2602.00690 https://arxiv.org/pdf/2602.00690 https://arxiv.org/html/2602.00690
arXiv:2602.00690v1 Announce Type: new
Abstract: Inspired by the eponymous hobby, we introduce Miniature Painting as the computational problem to paint a given graph $G=(V,E)$ according to a prescribed template $t \colon V \rightarrow C$, which assigns colors $C$ to the vertices of $G$. In this setting, the goal is to realize the template using a shortest possible sequence of brush strokes, where each stroke overwrites a connected vertex subset with a color in $C$. We show that this problem is equivalent to a reversal of the well-studied Free Flood-It game, in which a colored graph is decolored into a single color using as few moves as possible. This equivalence allows known complexity results for Free Flood-It to be transferred directly to Miniature Painting, including NP-hardness under severe structural restrictions, such as when $G$ is a grid, a tree, or a split graph. Our main contribution is a polynomial-time algorithm for Miniature Painting on graphs that are free of induced co-gems, a graph class that strictly generalizes cographs. As a direct consequence, Free Flood-It is also polynomial-time solvable on co-gem-free graphs, independent of the initial coloring.
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There are a lot of takeaways from this:
1. Organizing locally gives you a massive advantage because you will always know your local area better than ICE ever can.
2. Be agile. You can always change tactics faster than a centralized organization.
3. Organize now. The sooner you build your networks, the sooner you can learn.
4. Identify ICE facilities and organize monitoring them directly.
But I think the most interesting one that's not explicitly in there, one that's hinted at the last one, is to go on the offensive. ICE is already afraid. If we all take the anger we have at the murder of #ReneGood, find the local ICE facility that they'll stage from, and bring that anger to #OccupyICE we might be able to just shut the whole thing down preemptively. Completely stop all ICE operations across the US. If they want to fight, they can fight *with everyone, all at once.*
Shut down their ability to operate at all. They have a logistics pipeline. They need cars, they need oil in those cars, they need to be able to move those cars to target areas. They also need money to pay those agents. All of those can be disrupted.
The regime needs your money and labor to maintain the illusion of legitimacy. They chose a bad time because you can hit both of those at once *right now* with a combination of #GeneralStrike and #TaxStrike, and then #BoycottEverything.
The regime is weaker than it's ever been. It's flailing. Their own base is demanding the release of the #EpsteinFiles. Their last gasp attempt to prevent the radical change that's coming is just to ethnically cleanse the US back to the 50's (which is what they always meant by "Make America Great Again"). Trump will do anything to stay in power, even if it means killing everyone on Earth in the process. But Americans can end it now by going on the offensive.
Now is the time.
#USPol