Tootfinder

China's Hainan province tests letting some corporate users bypass the Great Firewall and access the global internet, as it seeks to become a free-trade port (Ben Jiang/South China Morning Post)
https://www.scmp.com/tech/policy…

China will drop the Great Firewall for some users, but only in southern Hainan
Employees of companies operating in the island province can apply for the ‘Global Connect’ scheme, but some content will remain restricted.

Does someone know how to change the port for an SSH based cache?
The `user@host:port` pattern doesn't work on my machine.
https://discourse.nixos.org/t/how-to-change-port-for-ssh-based-cache/63908

🎉 perfSONAR turns 20! 🎉
What started with a single line of code in 2001 has grown into a worldwide network performance monitoring infrastructure, spanning all 7 continents with:
✅ 20 years of continuous operation
✅ 6 leading R&E networks driving its development
✅ over 2,000 registered instances deployed across 1,000 organizations
Learn more about perfSONAR’s journey and impact over the past 20 years:

perfSONAR Celebrates 20 Years of Simplifying Global Research Collaboration Through Standardized Network Measurement and Testing | GÉANT CONNECT Online
April 2, 2025 — The global research and education (R&E) community is celebrating a major milestone in high-performance networking and collaboration: the 20th anniversary of perfSONAR. Since April 2005, this powerful, open-source toolkit has enabled researchers and network operators to measure and troubleshoot performance across diverse network environments. perfSONAR’s reach has extended to all seven

This https://arxiv.org/abs/2505.19945 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

Signed Angle Rigid Graphs for Network Localization and Formation Control
Graph rigidity theory studies the capability of a graph embedded in the Euclidean space to constrain its global geometric shape via local constraints among nodes and edges, and has been widely exploited in network localization and formation control. In recent years, the traditional rigidity theory has been extended by considering new types of local constraints such as bearing, angle, ratio of distance, etc. Among them, the signed angle constraint received extensive attention since it is practic…

corporate_directors: Global corporate directors (2016)
Bipartite network of directors and the companies on whose boards they sit, spanning 54 countries worldwide, constructed from data collected by the Financial Times (c. Sept. 2016). Person nodes are annotated with age and gender. Company nodes are annotated with their country, sector, industry, and number of employees.
This network has 356638 nodes and 377060 edges.
Tags: Economic, Governance, Unweighted, Metadata

This https://arxiv.org/abs/2505.10018 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csRO_…

LEMON-Mapping: Loop-Enhanced Large-Scale Multi-Session Point Cloud Merging and Optimization for Globally Consistent Mapping
Multi-robot collaboration is becoming increasingly critical and presents significant challenges in modern robotics, especially for building a globally consistent, accurate map. Traditional multi-robot pose graph optimization (PGO) methods ensure basic global consistency but ignore the geometric structure of the map, and only use loop closures as constraints between pose nodes, leading to divergence and blurring in overlapping regions. To address this issue, we propose LEMON-Mapping, a loop-enha…

Affine connections for Galilean and Carrollian structures: a unified perspective
Quentin Vigneron, Hamed Barzegar, James Read
https://arxiv.org/abs/2506.03936

Affine connections for Galilean and Carrollian structures: a unified perspective
We develop a classification of general Carrollian structures, permitting affine connections with both torsion and non-metricity. We compare with a recent classification of general Galilean structures in order to present a unified perspective on both. Moreover, we demonstrate how both sets of structures emerge from the most general possible Lorentzian structures in their respective limits, and we highlight the role of global hyperbolicity in constraining both structures. We then leverage this wo…

"EV battery recycling key to easing future lithium supply constraints, modeling study shows"
#EV #ElectricVehicle #Cars

EV battery recycling key to easing future lithium supply constraints, modeling study shows
Lightweight, powerful lithium-ion batteries are crucial for the transition to electric vehicles, and global demand for lithium is set to grow rapidly over the next 25 years. A new analysis from the University of California, Davis, published May 29 in Nature Sustainability, looks at how new mining operations and battery recycling could meet that demand. Recycling could play a big role in easing supply constraints, the researchers found.

Extending near-axis equilibria in DESC
Dario Panici, Eduardo Rodriguez, Rory Conlin, Daniel Dudt, Egemen Kolemen
https://arxiv.org/abs/2506.05170 https://

Extending near-axis equilibria in DESC
The near-axis description of optimised stellarator fields has proven to be a powerful tool both for design and understanding of this magnetic confinement concept. The description consists of an asymptotic model of the equilibrium in the distance from its centermost axis, and is thus only approximate. Any practical application therefore requires the eventual construction of a global equilibrium. This paper presents a novel way of constructing global equilibria using the \texttt{DESC} code that g…

This https://arxiv.org/abs/2505.19521 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csRO_…

Learning Dynamics under Environmental Constraints via Measurement-Induced Bundle Structures
Learning unknown dynamics under environmental (or external) constraints is fundamental to many fields (e.g., modern robotics), particularly challenging when constraint information is only locally available and uncertain. Existing approaches requiring global constraints or using probabilistic filtering fail to fully exploit the geometric structure inherent in local measurements (by using, e.g., sensors) and constraints. This paper presents a geometric framework unifying measurements, constraints…