Tootfinder

Global linear drift-wave eigenmode structures on flux surfaces in stellarators: ion temperature gradient mode
Hongxuan Zhu, H. Chen, Z. Lin, A. Bhattacharjee
https://arxiv.org/abs/2506.12948

Global linear drift-wave eigenmode structures on flux surfaces in stellarators: ion temperature gradient mode
Turbulent transport greatly impacts the performance of stellarator magnetic confinement devices. While significant progress has been made on the numerical front, theoretical understanding of turbulence in stellarators is still lacking. In particular, due to nonaxisymmetry, different field lines couple within flux surfaces, the effects from which have yet to be adequately studied. In this work, we numerically simulate the linear electrostatic ion-temperature-gradient modes in stellarators using …

Nanoscale Magnetic Resonance Imaging and Control of a Strongly Interacting Dipolar System
Piotr Put, Nathaniel T. Leitao, Christina Spaegele, Haoyang Gao, Oksana Makarova, Bartholomeus Machielse, Hengyun Zhou, Federico Capasso, Leigh S. Martin, Hongkun Park, Mikhail D. Lukin
https://arxiv.org/abs/2506.11920

Nanoscale Magnetic Resonance Imaging and Control of a Strongly Interacting Dipolar System
Magnetic Resonance Imaging (MRI) is a fundamental tool for physical and life sciences, yet its spatial resolution is typically limited to macroscopic scales. Here, we demonstrate nanoscale MRI by combining strong, time-dependent local magnetic field gradients with coherent control of a dense ensemble of electron spins hosted in atom-like defects in diamond. Using this platform, we generate and manipulate nanoscale spin textures - spatially structured patterns of spin orientation - and track the…

Nicht die #dümmsten #Bauern 😅

Trump and his Republican henchmen are pure evil
US agriculture secretary says Medicaid recipients can replace deported farm workers | US news | The Guardian https://www.theguardian.com/us-news/2025/jul/09/trump-agriculture-medicaid-migrant-farm-workers

Gavin Newsom and His Cruel Notion of 'Cruel' (Victor Davis Hanson/American Greatness)
https://amgreatness.com/2025/06/09/gavin-newsom-and-his-cruel-notion-of-cruel/
http://www.memeorandum.com/250609/p58#a250609p58

Holiday.

Data-Driven Model Reduction by Moment Matching for Linear and Nonlinear Parametric Systems
Hanqing Zhang, Junyu Mao, Mohammad Fahim Shakib, Giordano Scarciotti
https://arxiv.org/abs/2506.10866

Data-Driven Model Reduction by Moment Matching for Linear and Nonlinear Parametric Systems
Theory and methods to obtain parametric reduced-order models by moment matching are presented. The definition of the parametric moment is introduced, and methods (model-based and data-driven) for the approximation of the parametric moment of linear and nonlinear parametric systems are proposed. These approximations are exploited to construct families of parametric reduced-order models that match the approximate parametric moment of the system to be reduced and preserve key system properties suc…

🇺🇦 #NowPlaying on BBCRadio3's #OperaOn3
Charles Gounod, Ștefan Pop, Carolina López Moreno, Adam Pałka, Boris Pinkhasovich, Hongni Wu, Monika-Evelin Liiv, Ossian Huskinson, Chorus of the Royal Opera House, Covent Garden, Orchestra of the Royal Opera House, Covent Garden & Maurizio Benini:
🎵 Faust - Acts 1 & 2

Gradient-Adaptive Policy Optimization: Towards Multi-Objective Alignment of Large Language Models
Chengao Li, Hanyu Zhang, Yunkun Xu, Hongyan Xue, Xiang Ao, Qing He
https://arxiv.org/abs/2507.01915

Gradient-Adaptive Policy Optimization: Towards Multi-Objective Alignment of Large Language Models
Reinforcement Learning from Human Feedback (RLHF) has emerged as a powerful technique for aligning large language models (LLMs) with human preferences. However, effectively aligning LLMs with diverse human preferences remains a significant challenge, particularly when they are conflict. To address this issue, we frame human value alignment as a multi-objective optimization problem, aiming to maximize a set of potentially conflicting objectives. We introduce Gradient-Adaptive Policy Optimization…

Orbital Stability of Plane Waves in the Klein-Gordon Equation against Localized Perturbations
Emile Bukieda, Louis Gar\'enaux, Bj\"orn de Rijk
https://arxiv.org/abs/2506.06029

Orbital Stability of Plane Waves in the Klein-Gordon Equation against Localized Perturbations
We investigate the stability and long-term behavior of spatially periodic plane waves in the complex Klein-Gordon equation under localized perturbations. Such perturbations render the wave neither localized nor periodic, placing its stability analysis outside the scope of the classical orbital stability theory for Hamiltonian systems developed by Grillakis, Shatah, and Strauss. Inspired by Zhidkov's work on the stability of time-periodic, spatially homogeneous states in the nonlinear Schröding…