Tootfinder

Density jump as a function of the field for parallel relativistic collisionless shocks
Antoine Bret, Ramesh Narayan
https://arxiv.org/abs/2506.07973 https:…

Density jump as a function of the field for parallel relativistic collisionless shocks
Collisionless shocks are frequently analyzed using the magnetohydrodynamic formalism (MHD), even though the required collisionality hypothesis is not fulfilled. In a previous work \citep{BretJPP2018}, we presented a model of collisionless shock displaying an important departure from the expected MHD behavior, in the case of a strong flow aligned magnetic field. This model was non-relativistic. Here, it is extended to the relativistic regime, considering zero upstream pressure and upstream Loren…

How to prepare for a 8h train ride: go running.
Now of to Prague to #FlockToFedora; looking forward to meet a lot of old friends there and make new ones.
Ohh, and I give a talk there, too: When and how to use upstream Linux kernels to fix or improve Fedora –

from my link log —
ZJIT has been merged into Ruby.
https://railsatscale.com/2025-05-14-merge-zjit/
saved 2025-05-14 https://

ZJIT has been merged into Ruby
ZJIT has been merged into upstream Ruby. Learn about its architecture!

Falls in jemandes rezentem Lenovo-Laptop bei einem Linux-Updtate plötzlich die Bluetooth-Funktionalität verschwindet, könnte sich eine der hier empfohlenen Methoden lohnen (bei mir war "update firmware with upstream" nötig). Schuld war das linux-firmware-Paket.
#ServiceToot #Lenovo

GitHub - johnmeade/linux-yoga-9i-2-in-1-aura: Linux support information for the Lenovo Yoga 9i 2-in-1 Aura Edition laptop
Linux support information for the Lenovo Yoga 9i 2-in-1 Aura Edition laptop - johnmeade/linux-yoga-9i-2-in-1-aura

»HTTP/1.1 Must Die – It's time to acknowledge HTTP/1.1 is insecure«
Admittedly, I know pers. not how seriously you have to take this but I am only developing web servers set to HTTP/2.0, because HTTP/3 is not yet extensively supported.
🪦 https://http1mustdie.com

HTTP/1.1 Must Die
Upstream HTTP/1.1 is inherently insecure, and routinely exposes millions of websites to hostile takeover. Join the mission to kill HTTP/1.1 now

Integrating Upstream Supply Chains into Generation Expansion Planning
Boyu Yao, Andrey Bernstein, Yury Dvorkin
https://arxiv.org/abs/2508.03001 https://arx…

Integrating Upstream Supply Chains into Generation Expansion Planning
Rising electricity demand underscores the need for secure and reliable generation expansion planning that accounts for upstream supply chain constraints. Traditional models often overlook limitations in materials, manufacturing capacity, lead times for deployment, and field availability, which can delay availability of planned resources and thus to threaten system reliability. This paper introduces a multi-stage supply chain-constrained generation expansion planning (SC-GEP) model that optimize…

Planar Collisionless Shock Simulations with Semi-Implicit Particle-in-Cell Model FLEKS
Hongyang Zhou, Yuxi Chen, Chuanfei Dong, Liang Wang, Ying Zou, Brian Walsh, G\'abor T\'oth
https://arxiv.org/abs/2506.08384

Planar Collisionless Shock Simulations with Semi-Implicit Particle-in-Cell Model FLEKS
This study investigates the applicability of the semi-implicit particle-in-cell code FLEKS to collisionless shock simulations, with a focus on the parameter regime relevant to global magnetosphere modeling. We examine one- and two-dimensional local planar shock simulations, initialized using MHD states with upstream conditions representative of the solar wind at 1 au, for both quasi-perpendicular and quasi-parallel configurations. The refined algorithm in FLEKS proves robust, enabling accurate …

New set of #Gentoo #Linux Distribution Kernels (6.1.143, 6.6.96, 6.12.36, 6.15.5) is out. This set brings some major changes:
• I've backported a bunch of changes from sys-kernel/gentoo-kernel to sys-kernel/vanilla-kernel that were missing — notably wider architecture support.
• I've added default #RISCV configs to 6.12 (in addition to 6.15), since Fedora had them.
• All three packages are based off the baseline kernel tarball upstream patch (vanilla-kernel used to fetch patch-level tarball every time, and gentoo-kernel* used genpatches for patch versions). This should reduce disk space and bandwidth use.
• All three packages now support verify-sig. Rather than verifying the uncompressed tarball signature, we now use upstream `sha256sums.asc` file to verify the compressed tarball and patch.
• sys-kernel/gentoo-kernel* now repackages genpatches. This means patchset that's much leaner and faster to apply (since we just fetch and use the combined upstream patch rather than including point patches). This also means that we are able to release Distribution Kernels before gentoo-sources are done.
The changes still need to be done to 5.15 and 5.10 branches — we're going to do for the next upstream releases of these.
#kernel

Suppressing secondary shock waves in jam-absorption driving via string-stable support vehicles
Atsushi Suzuki, Akihiro Tokumitsu, Ryosuke Nishi
https://arxiv.org/abs/2508.03604 …

Suppressing secondary shock waves in jam-absorption driving via string-stable support vehicles
As a freeway-driving strategy, jam-absorption driving (JAD) clears a shock wave (i.e., an upstream-moving congestion wave) by modulating the velocity of a single vehicle (called the absorbing vehicle) upstream of the wave, and improves traffic performances such as fuel consumption and collision risk. However, the deceleration of the absorbing vehicle causes trailing vehicles to slow down, generating secondary shock waves that undermine these benefits. This study proposes a method to suppress se…

4 MB/s upstream in der Ferienwohnung. Das ist fast schon digital detox.

Why LLM Safety Guardrails Collapse After Fine-tuning: A Similarity Analysis Between Alignment and Fine-tuning Datasets
Lei Hsiung, Tianyu Pang, Yung-Chen Tang, Linyue Song, Tsung-Yi Ho, Pin-Yu Chen, Yaoqing Yang
https://arxiv.org/abs/2506.05346

Why LLM Safety Guardrails Collapse After Fine-tuning: A Similarity Analysis Between Alignment and Fine-tuning Datasets
Recent advancements in large language models (LLMs) have underscored their vulnerability to safety alignment jailbreaks, particularly when subjected to downstream fine-tuning. However, existing mitigation strategies primarily focus on reactively addressing jailbreak incidents after safety guardrails have been compromised, removing harmful gradients during fine-tuning, or continuously reinforcing safety alignment throughout fine-tuning. As such, they tend to overlook a critical upstream factor: …

Uh, World Bank, solar?
World Bank Lifts Ban on Nuclear Power, Considers Upstream Gas | Financial Post
https://financialpost.com/pmn/business-pmn/world-bank-lifts-ban-on-nuclear-power-considers-upstream-gas

hacker: "yeah, I downloaded a driver from the manufacturer. It didn't build of course, because the v2l API changed between what they released and the kernel you're running, but i updated it to the new API and it worked."
linux user: "you going to send the driver upstream?"
https://mk.moth.zon…

eri :floofMischief: (@eri)
hacker: i am spying on you through your webcam linux user: omg you got it working?

To cross or not to cross, that's the question...
(One of the more intense streams — the outflow of a glacier — I had to cross in my life, that bridge looks a lot safer that it was IRL...)
#FootpathFriday #Hiking

This https://arxiv.org/abs/2505.24200 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csSD_…

Improving Multilingual Speech Models on ML-SUPERB 2.0: Fine-tuning with Data Augmentation and LID-Aware CTC
Multilingual speech processing with self-supervised or supervised pre-trained Speech Foundation Models (SFM) has achieved strong performance on tasks like Language Identification (LID) and Automatic Speech Recognition (ASR). However, these models struggle with limited resources during fine-tuning. This paper enhances multilingual LID and ASR on ML-SUPERB 2.0 by exploring multiple strategies for adapting SFMs, including frozen upstream training, partial fine-tuning, and low-rank adaptation. Furt…

Upstream competition and exclusive content provision in media markets
Kiho Yoon
https://arxiv.org/abs/2506.15063 https://arxiv.org/pd…

Upstream competition and exclusive content provision in media markets
With a multilateral vertical contracting model of media markets, we examine upstream competition and contractual arrangements in content provision. We analyze the trade of content by the Nash bargaining solution and the downstream competition by the Hotelling location model. We characterize the equilibrium outcomes and the contractual arrangements for various vertical structures. We show that the possibility of exclusive contracts rises when the value of the premium content increases, the degre…

xAI apologizes for Grok's "horrific behavior" when it wrote antisemitic posts on July 8, and blames "an update to a code path upstream of the Grok bot" (Anthony Ha/TechCrunch)
https://techcrunch.com/2025/07/12/xai-and-grok-apologize-for…

xAI and Grok apologize for ‘horrific behavior’ | TechCrunch
In a series of posts on X, the AI chatbot Grok apologized for what it admitted was “horrific behavior.” The posts appear to be an official statement from xAI, the Elon Musk-led company behind Grok, as opposed to an AI-generated explanation for Grok’s posts. (xAI recently acquired X, where Grok is prominently featured.)

Quantum Hall Andreev Conversion in Graphene Nanostructures
Alexey Bondarev, William H. Klein, Harold U. Baranger
https://arxiv.org/abs/2507.02114 https://

Quantum Hall Andreev Conversion in Graphene Nanostructures
We study Andreev conversion in clean nanostructures containing an interface between graphene in the quantum Hall (QH) state and a superconductor, focusing on the lowest Landau level. First, several graphene nanostructures formed from zigzag edges with sharp corners are considered using a tight-binding model. We find the scattering state for an electron impinging on the interface from the upstream QH edge state, together with the probability of it exiting as a hole in the downstream QH edge stat…

This https://arxiv.org/abs/2503.22935 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCR_…

Improving the Context Length and Efficiency of Code Retrieval for Tracing Security Vulnerability Fixes
An upstream task for software bill-of-materials (SBOMs) is the accurate localization of the patch that fixes a vulnerability. Nevertheless, existing work reveals a significant gap in the CVEs whose patches exist but are not traceable. Existing works have proposed several approaches to trace/retrieve the patching commit for fixing a CVE. However, they suffer from two major challenges: (1) They cannot effectively handle long diff code of a commit; (2) We are not aware of existing work that scales…

#Matplotlib has a lot of "image comparison tests" that are horrible fragile. Technically, most of them permit some deviation from the reference images, but quite often I've been getting higher RMS than that. So for a long time, we've been maintaining patches that increased the tolerance in tests, and regularly either had to be rebased and updated for new tests.
At some point upstream started adding conditions permitting higher tolerance on non-x86_64 platforms. Of course, these changes forced me to rebase our patches. Curious enough, my previous overrides often happened to be close to the tolerance given for non-x86_64 platforms.
Today, it finally occurred to me that instead of updating the patch once again, I can try dropping it entirely and just sed-ing all `platform.machine() == 'x86_64'` with `False`. And guess what — down to 3 failures (related to TeΧ). And I don't have to spend 15 minutes manually doing what effectively accounted to the same thing.
#Gentoo #Python

@… thanks, I added to upstream <https://bugs.kde.org/show_bug.cgi?id=505552>; and drew attention to the downstream report.

As you ford life's rivers, keep your knees bent and face upstream so you can better see what's coming at you. But as you crawl life's ductworks, face downwind and keep your mouth shut lest you suck in dust-bunnies.
#NaturalPhilosophy #Strife and

“ upstream connect error or disconnect/reset before headers. reset reason: remote connection failure, transport failure reason: delayed connect error: 111”
Clear the decks

Effect of protection zone on the dynamics of a diffusion-advection population-toxicant model
Jing Gao, Xiaoli Wang, Guohong Zhang
https://arxiv.org/abs/2508.01246 https://

Effect of protection zone on the dynamics of a diffusion-advection population-toxicant model
This paper develops and analyzes a diffusion-advection model coupling population dynamics with toxicant transport, incorporating a boundary protection zone. For both upstream and downstream protection zone configurations, we investigate the combined influence of protected zones and key ecological factors on population persistence or extinction. Employing monotone dynamical system theory and eigenvalue analysis, we establish the global dynamics of the population-toxicant coexistence equilibrium.…

Real-Time Capable, Low-latency Upstream Scheduling in Multi-Tenant, SLA Compliant TWDM PON
Arijeet Ganguli, Marco Ruffini
https://arxiv.org/abs/2506.12118 …

Real-Time Capable, Low-latency Upstream Scheduling in Multi-Tenant, SLA Compliant TWDM PON
Virtualized Passive Optical Networks (vPONs) offer a promising solution for modern access networks, bringing enhanced flexibility, reduced capital expenditures (CapEx), and support for multi-tenancy. By decoupling network functions from physical infrastructure, vPONs enable service providers to efficiently share network resources among multiple tenants. In this paper, we propose a novel merging DBA algorithm, called the Dynamic Time and Wavelength Allocation (DTWA) algorithm, for a virtualized …

Systemic Trade Risk Suppresses Comparative Advantage in Rare Earth Dependent Industries
Peter Klimek, Sophia Baum, Markus Gerschberger, Maximilian Hess
https://arxiv.org/abs/2508.00556

Systemic Trade Risk Suppresses Comparative Advantage in Rare Earth Dependent Industries
Rare earth elements (REEs) are critical to a wide range of clean and high-tech applications, yet global trade dependencies expose countries to vulnerabilities across production networks. Here, we construct a multi-tiered input-output trade network spanning 168 REE-related product codes from 2007-2023 using a novel AI-augmented statistical framework. We identify significant differences between dependencies in upstream and intermediate (input) products, revealing that exposure and supplier concen…

Replaced article(s) found for cs.AI. https://arxiv.org/list/cs.AI/new
[8/8]:
- Machine Learning Methods for Small Data and Upstream Bioprocessing Applications: A Comprehensive ...
Johnny Peng, Thanh Tung Khuat, Katarzyna Musial, Bogdan Gabrys

Filamentation of the electromagnetic precursor in relativistic quasi-perpendicular electron-positron shocks
Emanuele Sobacchi, Yuri Lyubarsky, Lorenzo Sironi, Masanori Iwamoto
https://arxiv.org/abs/2507.22561

Filamentation of the electromagnetic precursor in relativistic quasi-perpendicular electron-positron shocks
We present a scenario that could explain non-thermal particle acceleration in relativistic quasi-perpendicular electron-positron shocks, such as the termination shock of pulsar wind nebulae. The shock produces a strong electromagnetic precursor that propagates into the upstream plasma, which is initially threaded by a uniform background magnetic field. We show that the filamentation instability breaks the precursor into radiation filaments parallel to the shock normal. The transverse scale of t…

Google Project Zero to publicly announce bugs within a week of reporting them https://therecord.media/google-project-zero-publicly-announce-vulnerabilities-week-after-reporting

Cooperation as Black Box: Conceptual Fluctuation and Diagnostic Tools for Misalignment in MAS
Shayak Nandi, Fernanda M. Eliott
https://arxiv.org/abs/2506.22876

Cooperation as Black Box: Conceptual Fluctuation and Diagnostic Tools for Misalignment in MAS
Misalignment in multi-agent systems (MAS) is often treated as a technical failure; yet many such failures originate upstream, during the conceptual design phase, where semantic ambiguity and normative projection take place. This paper identifies a foundational source of interpretive misalignment in MAS: the systemic conflation of cooperation and coordination, and the moral overreading that follows. Using the Rabbit-Duck illusion, we illustrate how perspective-dependent readings of agent behavio…

Very early in the commercial registrar era, some registrars priced domains in harmony with their costs: no teaser marketing, just discounts on buying multiple future years at once. Even after everyone stopped giving out-year discounts explicitly, the fact of inflation in upstream fees made it wise for legitimate domain holders to buy many years in advance.
I am close to wanting a return to the InterNIC model. DNS Marxism.

The Spamhaus Project (@spamhaus@infosec.exchange)
Attached: 1 image Over the past 30 days, six gTLDs have ranked in the Top 10 for being associated with botnet C2s - all showing significant increases in detections 📈: .tech (+4,000%), .icu (+433%), .today (+429%), .fun (+400%), .digital (+314%), and .life (+258%). 🌐 Full stats over at: https://www.spamhaus.org/reputation-statistics/gtlds/domains/ These TLDs are all cheap to register (as low as $0.98 using a promo code 🤑), but expensive to renew. Perfect conditions for throwaway dom…

Vortex-Induced Drag Forecast for Cylinder in Non-uniform Inflow
Jiashun Guan, Haoyang Hu, Tianfang Hao, Huimin Wang, Yunxiao Ren, Dixia Fan
https://arxiv.org/abs/2506.21075

Vortex-Induced Drag Forecast for Cylinder in Non-uniform Inflow
In this letter, a physics-based data-driven strategy is developed to predict vortex-induced drag on a circular cylinder under non-uniform inflow conditions - a prevalent issue for engineering applications at moderate Reynolds numbers. Traditional pressure-signal-based models exhibit limitations due to complex vortex dynamics coupled with non-uniform inflow. To address this issue, a modified fully connected neural network (FCNN) architecture is established that integrates upstream velocity measu…

Probing Proton versus Electron Heating and Energization during Magnetic Reconnection
Zhiyu Yin, James F. Drake, Marc Swisdak
https://arxiv.org/abs/2508.00119 https://

Probing Proton versus Electron Heating and Energization during Magnetic Reconnection
The mechanisms controlling the relative heating and energization of electrons and protons during magnetic reconnection are explored. Simulations are carried out with the kglobal model, which produces bulk heating and the extended powerlaw distributions of both species that have been documented in observations. The simulations have been carried out with a range of proton-to-electron mass ratios and upstream temperatures to isolate the factors that control energy gain. The simulations reveal that…

from my link log —
jemalloc postmortem.
https://jasone.github.io/2025/06/12/jemalloc-postmortem/
saved 2025-06-13 https…

Jason Evans
The jemalloc memory allocator was first conceived in early 2004, and hasbeen in public use for about 20 years now. Thanks to the nature of open source software licensing,jemalloc will remain publicly available indefinitely. But active upstream development has come to anend. This post briefly desc...

Three-dimensional Dynamics of Strongly Magnetized Ion-Electron Relativistic Reconnection
Fabio Bacchini, Gregory R. Werner, Camille Granier, Jesse Vos
https://arxiv.org/abs/2507.12509

Three-dimensional Dynamics of Strongly Magnetized Ion-Electron Relativistic Reconnection
We present 3D simulations of semirelativistic collisionless magnetic reconnection, where upstream ions are subrelativistic while electrons are ultrarelativistic. We employ the realistic proton-to-electron mass ratio and explore a range of upstream ion magnetization spanning two orders of magnitude, with our highest-magnetization run achieving unprecedentedly large domain sizes. Through a parameter scan, we find that as the system transitions from mildly to trans- and ultrarelativistic regimes t…

If someone wants to investigate a curious issue:
#Python 's subprocess module reports the exit status for a signaled process as (128 signal) for upstream (similarly to how bash's `$?` works), but -signal (as documented) for me.
#Gentoo #Linux

Always nice when upstream accepts a trivial fix even though the obvious bug doesn't affect them right now.
#Gentoo #Python

Physics-Informed Neural Networks for Nonlocal Flow Modeling of Connected Automated Vehicles
Chenguang Zhao, Huan Yu
https://arxiv.org/abs/2506.18357 https:…

Physics-Informed Neural Networks for Nonlocal Flow Modeling of Connected Automated Vehicles
Connected automated vehicles (CAVs) cruising control strategies have been extensively studied at the microscopic level. CAV controllers sense and react to traffic both upstream and downstream, yet most macroscopic models still assume locality, where the desired speed only depends on local density. The nonlocal macroscopic traffic flow models that explicitly capture the ``look ahead'' and ``look behind'' nonlocal CAV dynamics remain underexplored. In this paper, we propose a Physics-informed Neu…

Agentic AI and Hallucinations
Engin Iyidogan, Ali I. Ozkes
https://arxiv.org/abs/2507.19183 https://arxiv.org/pdf/2507.19183…

Agentic AI and Hallucinations
We model a competitive market where AI agents buy answers from upstream generative models and resell them to users who differ in how much they value accuracy and in how much they fear hallucinations. Agents can privately exert effort for costly verification to lower hallucination risks. Since interactions halt in the event of a hallucination, the threat of losing future rents disciplines effort. A unique reputational equilibrium exists under nontrivial discounting. The equilibrium effort, and t…

Occurrence of Non-Stationarity at Earth's Quasi-Perpendicular Bow Shock
Ajay Lotekar, Yuri V. Khotyaintsev, Daniel B. Graham, Andrew Dimmock, Andreas Johlander, Ahmad Lalti
https://arxiv.org/abs/2507.13817

Occurrence of Non-Stationarity at Earth's Quasi-Perpendicular Bow Shock
Collisionless shocks can exhibit non-stationary behavior even under steady upstream conditions, forming a complex transition region. Ion phase-space holes, linked to shock self-reformation and surface ripples, are a signature of this non-stationarity. We statistically analyze their occurrence using 521 crossings of Earth's quasi-perpendicular bow shock. Phase-space holes appear in 65% of cases, though the actual rate may be higher as the holes may not be resolved during fast shock crossings. Th…

A while ago, I've followed the example given by #Fedora and unbundled ensurepip wheels from #Python in #Gentoo (just checked — "a while ago" was 3 years ago). This had the important advantage that it enabled us to update these wheels along with the actual pip and setuptools packages, meaning new virtual environments would get fresh versions rather than whatever CPython happened to bundle at the time of release.
I had considered using our system packages to prepare these wheels, but since we were already unbundling dependencies back then, that couldn't work. So I just went with fetching upstream wheels from PyPI. Why not build them from source instead? Well, besides feeling unnecessary (it's not like the PyPI wheels are actually binary packages), we probably didn't have the right kind of eclass support for that at the time.
Inspired by @…, today I've tried preparing new revisions of ensurepip packages that actually do build everything from source. So what changed, and why should building from source matter now? Firstly, as part of the wheel reuse patches, we do have a reasonably clean architecture to grab the wheels created as part of the PEP517 build. Secondly, since we're unbundling dependencies from pip and setuptools, we're effectively testing different packages than these installed as ensurepip wheels — and so it would be meaningful to test both variants. Thirdly, building from source is going to make patching easier, and at the very least enable user patching.
While at it, I've refreshed the test suite runs in all three regular packages (pip, setuptools and wheel — we need an "ensurepip" wheel for the last because of test suites). And of course, I hit some test failures in testing the versions with bundled dependencies, and I've discovered a random bug in #PyPy.
https://github.com/gentoo/gentoo/pull/42882 (yes, we haven't moved yet)
https://github.com/pypy/pypy/issues/5306

The evolution of CME sheath turbulence from L1 to Earth: Wind and MMS observations of the 2023-04-23 CME
Matthew R. Argall, Li-Jen Chen, No\'e Lugaz, Norberto Romanelli, Jaye L. Verniero, Charles W. Smith, Brandon Burkholder, Victoria Wilder
https://arxiv.org/abs/2505.13645

The evolution of CME sheath turbulence from L1 to Earth: Wind and MMS observations of the 2023-04-23 CME
An interplanetary shock driven by a coronal mass ejection (CME) containing an interval of sub-Alfvénic flow impacted Earth on April 23, 2024. In this article, we analyze the turbulence in the sheath region between the shock and CME to determine how it evolves from L1 (as observed by Wind) to Earth (as observed by MMS, upstream of the bow shock). Wind and MMS were separated by $55\,\mathrm{R_{E}}$ in the dawn-dusk direction, but the shock normals differ by only $2.8^{\circ}$ and the Pearson cor…

My personal recommendation would be to stay away from the "#Python Code Quality Authority". The projects have been pretty much taken over by a toxic and mean-spirited person. #Ruff is a good replacement, with very friendly upstream.
#PyCQA