Tootfinder

Neu auf der Wunschliste: USB Kabel für die Band
https://www.amazon.de/hz/wishlist/ls/3HYT6TVV6PW2H?ref_=wl_share

Noise hunting update: the 120 Hz / 38 kHz stuff was a USB-A QC power brick feeding a small external monitor on the lab bench.
Swapped to a different brick and it went away.
But the weird constellation smearing and eye closure is still here. The noise was a red herring.

Neue Apple-Monitore: Studio Display 2 und Studio Display XDR
Apple hat seine Monitore vereinheitlicht. 120 Hz gibt es aber nur beim teuren, plötzlich kleineren XDR-Modell – mit 5K statt 6K-Auflösung.
https://www…

Neu auf der Wunschliste: Sprühkleber
https://www.amazon.de/hz/wishlist/ls/3HYT6TVV6PW2H

Chronic 40 Hz light flicker mitigates epileptogenesis through a visual pathway associated with the dorsal lateral geniculate nucleus shell (in epileptic mice) https://www.nature.com/articles/s41467-025-64269-2

Chronic 40 Hz light flicker mitigates epileptogenesis through a visual pathway associated with the dorsal lateral geniculate nucleus shell - Nature Communications
Whether and how gamma entrainment using sensory stimuli (GENUS) has a role in antiepileptogenesis is not fully understood. Here authors show that GENUS reduces seizure susceptibility in male mice. These effects are mediated via specific visual neural pathway.

🇺🇦 #NowPlaying on BBCRadio3's #UltimateCalm
Dustin O’Halloran:
🎵 196 hz pt 5
#DustinOHalloran
https://open.spotify.com/track/43j3m46kscgqG00j027Tc4

#Upcoming “Sol.Hz” by #Seefeel is their first full-length album in fifteen years. A hazy and blissed out collection of fractured melodies and vaporous textures. Available via Warp Records, May 1st. …

Frequency-Dependent Magnetic modulation of deposition morphology
S. K. Saroj, P. K. Panigrahi
https://arxiv.org/abs/2602.21789 https://arxiv.org/pdf/2602.21789 https://arxiv.org/html/2602.21789
arXiv:2602.21789v1 Announce Type: new
Abstract: This paper presents a novel approach for magnetic modulation of deposition morphology in an evaporating ferrofluid droplet. The magnetic field strength and ferrofluid concentration are kept unchanged, while the actuation frequencies are varied from 0.016 Hz to 5 Hz. In the absence of a magnetic field, a coffee-ring formation is observed and consistent with previous studies\cite{deegan1997capillary,deegan2000contact,saroj2019drying}. The application of a time-dependent magnetic field significantly modifies the deposition morphology. The periodic magnetic field induces the formation of multiple concentric rings during evaporation. The number of rings initially increases with increasing actuation frequency of the electromagnet. However, beyond a critical actuation frequency ($f_c = 0.2\,\text{Hz}$), the number of rings decreases. At higher actuation frequencies, magnetic particles preferentially deposit in the central region of the droplet, resulting in suppression of the coffee-ring effect. Additionally, the thickness of the inner rings and the ring spacing decrease with increasing actuation frequency up to critical actuation frequency. The transition from multi-ring formation to coffee-ring suppression is governed by the competition among magnetic forcing, capillary flow, and particle diffusion. The underlying physical mechanisms responsible for droplet dynamics and deposition morphology under periodic magnetic fields are evaluated using scaling arguments. The results demonstrate that diffusive particle transport plays a dominant role in determining the deposition pattern. A non-dimensional magnetic switching number, based on the magnetic perturbation timescale, is introduced as a control parameter to characterize the frequency-dependent deposition behavior.
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Hz

Experimental Validation of HomHBFEM Simulations of Fast Corrector Magnets for PETRA IV
Jan-Magnus Christmann, Laura Anna Maria D'Angelo, Herbert De Gersem, Sven Pfeiffer, Sajjad Hussain Mirza, Adeel Amjad, Lucas Rousselange, Matthias Thede
https://arxiv.org/abs/2602.14824 https://arxiv.org/pdf/2602.14824 https://arxiv.org/html/2602.14824
arXiv:2602.14824v1 Announce Type: new
Abstract: This paper presents experimental validation of the homogenized harmonic balance finite element method (HomHBFEM), which we have developed as a dedicated simulation technique for magnets with fast excitation cycles, in particular the fast corrector (FC) magnets for PETRA IV at DESY. The HomHBFEM allows efficient three-dimensional nonlinear eddy-current simulations of laminated magnets at elevated frequencies with a relatively coarse finite element (FE) mesh and without computationally expensive time-stepping. This is achieved by combining a frequency-domain-based homogenization technique with the harmonic balance FE method. The simulation results for the magnetic flux density along the axis of the FC magnets as a function of frequency and the resulting integrated transfer function (ITF) are compared to Hall probe and search coil measurements of the first prototype FC magnet for PETRA IV. A good agreement between simulated and measured ITFs is achieved for excitation frequencies from 10 Hz to 10 kHz.
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